CYLINDRICAL BATTERY CELL HAVING CONNECTION CAP

Technology field
[1]
The present invention relates to a cylindrical battery cell having a connection cap, and more particularly, to a cylindrical battery cell that facilitates the welding process to increase the efficiency of the manufacturing process.
[2]
This application is an application for claiming priority for Korean Patent Application No. 10-2017-0129129 filed on October 10, 2017, and all contents disclosed in the specification and drawings of the application are incorporated herein by reference.
Background
[3]
In recent years, as the demand for portable electronic products such as notebook computers, video cameras, portable telephones, etc. is rapidly increasing, and development of electric vehicles, energy storage batteries, robots, satellites, etc. is in earnest, high-performance secondary batteries capable of repetitive charging and discharging Research on is being actively conducted.
[4]
Currently commercialized secondary batteries include nickel cadmium batteries, nickel hydride batteries, nickel zinc batteries, and lithium secondary batteries, among which lithium secondary batteries have little memory effect compared to nickel-based secondary batteries, so charging and discharging are free. , The self-discharge rate is very low and the energy density is high.
[5]
These lithium secondary batteries are largely classified into cylindrical batteries, prismatic batteries, and pouch-type batteries according to the shape of the battery case in which the positive electrode/separator/cathode electrode assembly is built. The demand for batteries is increasing significantly.
[6]
In recent years, in the field of manufacturing a battery module composed of a plurality of cylindrical battery cells, in order to simplify the process and improve energy density, a structure in which both the positive terminal and the negative terminal are connected to the bus bar on the upper surface of the cylindrical battery cell is often applied. Is increasing.
[7]
1 is a cross-sectional perspective view schematically showing one end surface of a conventional cylindrical battery cell.
[8]
Referring to FIG. 1, the cylindrical battery cell 1 includes an electrode assembly 9 having a negative electrode 3, a positive electrode 5, and a separator 7 disposed between the negative electrode 3 and the positive electrode 5 ). In addition, by placing the electrode assembly 9 inside the battery case 15 and injecting an electrolyte (not shown) so that the negative electrode 3, the positive electrode 5, and the separator 7 are impregnated with the electrolyte, the cylindrical battery The cell 1 can be manufactured.
[9]
In addition, conductive lead members 10 and 13 for collecting current generated during battery operation may be attached to the negative electrode 3 and the positive electrode 5, respectively. These lead members 10 and 13 may guide currents generated from the positive electrode 5 and the negative electrode 3 to the positive terminal 6 and the negative terminal 8, respectively.
[10]
However, since the width of the electrode terminal 8 formed on the outer periphery of the upper end of the conventional cylindrical battery cell 1 is very narrow, the welding process with a bus bar, which is a conductive metal member, is very difficult. Accordingly, the bonding process of electrically contacting and connecting a plurality of cylindrical battery cells is very difficult and takes a lot of time, causing a high defect rate, and thus, a large cause of an increase in manufacturing cost.
Detailed description of the invention
Technical challenges
[11]
Therefore, the present invention was created to solve the above problems, and in detail, it is an object of the present invention to provide a cylindrical battery cell that facilitates a welding process and increases the efficiency of a manufacturing process.
[12]
Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by examples of the present invention. In addition, it will be readily appreciated that the objects and advantages of the present invention can be realized by means of the appended claims and combinations thereof.
Task resolution
[13]
Cylindrical battery cell according to the present invention for achieving the above object,
[14]
As a cylindrical battery cell in which a first electrode terminal and a second electrode terminal having different polarities, respectively, are formed in the upper outer circumference and the center,
[15]
An electrode assembly having a structure in which an anode, a cathode, and a separator interposed between the anode and the cathode are wound;
[16]
A battery case in which the electrode assembly is impregnated with an electrolyte solution;
[17]
A cap assembly mounted on the open top of the battery case; And
[18]
A cap housing mounted on the battery case and the cap assembly and provided with an insulating material, and a first connection configured to be mounted on the cap housing and electrically connected to each of the first electrode terminal and the second electrode terminal It may include a connection cap having a plate and a second connection plate.
[19]
Here, the cap housing may have a receiving portion configured such that an upper surface is depressed downward to accommodate the first connection plate and the second connection plate therein.
[20]
In addition, the receiving portion may include a first mounting portion configured to receive and fix the first connection plate; A second mounting portion configured to receive and fix the second connection plate; And a partition portion formed between the first mounting portion and the second mounting portion to partition the first mounting portion and the second mounting portion.
[21]
Moreover, the cap housing may include an outer peripheral exposed portion opened to expose the first electrode terminal formed on the outer peripheral portion to the outside; And a central exposure portion opened to expose the second electrode terminal formed in the center to the outside.
[22]
Further, the first connection plate and the second connection plate may include electrode terminal welding portions positioned at each of the first electrode terminal and the second electrode terminal such that a lower surface thereof directly contacts an outer surface of the electrode terminal; And a bus bar welding part connected to one end of the electrode terminal welding part so that an upper surface thereof is exposed in an upward direction.
[23]
Further, the connection cap may further include a fixing cover coupled and fixed to the cap housing so as to cover and fix portions of upper surfaces of the first connection plate and the second connection plate.
[24]
In addition, the cap housing may have a guide protrusion protruding upward to guide the fixing position of the fixing cover.
[25]
Furthermore, the fixing cover may be provided with a fastener opened to allow the guide protrusion to be inserted therein.
[26]
Further, the fixing cover may include an outer peripheral welding groove opened so that the electrode terminal welding portion of the first connection plate is exposed to the outside; And a central welding tool opened to expose the electrode terminal welding portion of the second connection plate to the outside.
[27]
Further, the receiving portion of the cap housing may have a locking protruding protruding in the center direction to prevent the fixing cover from being separated from the receiving portion.
[28]
In addition, an array guide portion configured to guide an array of a plurality of cylindrical battery cells may be formed on an outer wall of the cap housing.
[29]
Furthermore, the arrangement guide part may have a flat raised structure having a flat surface in the left and right directions to guide the arrangement of the plurality of cylindrical battery cells in the left and right directions on both outer walls of the cap housing in the left and right directions.
[30]
Further, a triangular protrusion structure formed to guide an arrangement of a plurality of cylindrical battery cells in the front-rear direction may be provided on an outer wall of the cap housing in the front-rear direction.
[31]
Further, the battery module according to the present invention for achieving the above object includes a plurality of cylindrical battery cells according to the present invention.
[32]
In addition, the electronic device according to the present invention for achieving the above object includes the battery module.
Effects of the Invention
[33]
According to one aspect of the present invention, the cylindrical battery cell of the present invention is provided with a connection cap having a first connection plate and a second connection plate, so that the welding process for electrical connection between the electrode terminal and the bus bar can be smoothly performed. To exert an effect.
[34]
Accordingly, the cylindrical battery cell of the present invention can not only increase the efficiency of the manufacturing process, but also effectively reduce the defective rate, and ultimately, there is an effect of reducing manufacturing cost.
[35]
In addition, according to one aspect of the present invention, the cap housing not only makes it easy to mount the first connection plate and the second connection plate on the top of the cylindrical battery cell, but also maintains a stably mounted state without flow even after mounting. Bar, it is possible to easily proceed a process of bonding the first connection plate and the second connection plate to the cylindrical battery cell or bus bar.
[36]
Moreover, according to one aspect of the present invention, the cap housing of the present invention can guide the arrangement so that each of the first connection plate and the second connection plate can be electrically connected to the first electrode terminal and the second electrode terminal. In addition, in the welding process, the first connection plate and the second connection plate can be fixed without flow, thereby improving welding efficiency.
[37]
Further, according to an aspect of the present invention, the fixing cover of the present invention can be fixed in place by just fitting the guide protrusion formed in the cap housing and inserting it into the fixture, thereby effectively increasing manufacturing efficiency.
[38]
In addition, according to one aspect of the present invention, a separate locking protrusion is formed in the cap housing of the present invention for fixing the fixing cover, so that the fixing cover can be stably fixed to the receiving portion of the cap housing, The stopper formed on the locking protrusion may guide the fixing cover to be fixed in an accurate position, thereby increasing the accuracy of the welding operation and lowering the defect rate.
[39]
Further, according to one aspect of the present invention, the battery module of the present invention can be easily aligned by applying the arrangement of the cylindrical battery cells in the left and right directions and the front and rear directions by using the arrangement guide part formed in the cylindrical battery cell.
Brief description of drawings
[40]
The following drawings attached to the present specification illustrate preferred embodiments of the present invention, and serve to further understand the technical idea of ​​the present invention together with the detailed description of the present invention to be described later, so the present invention is described in such drawings. It is limited to and should not be interpreted.
[41]
1 is a cross-sectional perspective view schematically showing one end surface of a conventional cylindrical battery cell.
[42]
2 is a perspective view schematically showing a cylindrical battery cell according to an embodiment of the present invention.
[43]
3 is a partial perspective view schematically showing some configurations of a cylindrical battery cell according to an embodiment of the present invention.
[44]
4 is a partial cross-sectional view schematically showing some configurations of a cylindrical battery cell according to an embodiment of the present invention.
[45]
5 is a partial perspective view schematically showing some configurations of a cylindrical battery cell according to an embodiment of the present invention.
[46]
6 is a partial perspective view schematically showing some configurations of a cylindrical battery cell according to an embodiment of the present invention.
[47]
7 is a partial perspective view schematically showing some configurations of a cylindrical battery cell according to an embodiment of the present invention.
[48]
8 and 9 are partial perspective views schematically showing a process of assembling some components for a cylindrical battery cell according to another embodiment of the present invention.
[49]
10 is a cross-sectional view schematically showing a fixed cover that is a part of a cylindrical battery cell according to an embodiment of the present invention.
[50]
11 is a partial perspective view schematically showing a battery module according to an embodiment of the present invention.
Mode for carrying out the invention
[51]
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, the terms or words used in the present specification and claims should not be construed as being limited to ordinary or lexical meanings, and the inventor appropriately explains the concept of terms in order to explain his or her invention in the best way. Based on the principle that it can be defined, it should be interpreted as a meaning and concept consistent with the technical idea of ​​the present invention.
[52]
Accordingly, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and do not represent all of the technical spirit of the present invention. It should be understood that there may be equivalents and variations.
[53]
[54]
2 is a perspective view schematically showing a cylindrical battery cell according to an embodiment of the present invention. 3 is a partial perspective view schematically showing some configurations of a cylindrical battery cell according to an embodiment of the present invention. And, Figure 4 is a partial cross-sectional view schematically showing some configurations of the cylindrical battery cell according to an embodiment of the present invention.
[55]
2 to 4, the cylindrical battery cell 100 of the present invention includes a battery case 130, an electrode assembly 120, a cap assembly 140, and a connection cap 150.
[56]
Here, the battery case 130 is made of a lightweight conductive metal material such as aluminum, stainless steel, or an alloy thereof. In addition, the battery case 130 may have an opening with an open top and a closed cylindrical bottom facing it when viewed in the F direction. Further, as described above, plating layers are formed on the inner and outer surfaces thereof.
[57]
Here, terms representing directions such as before, after, left, right, up, and down may vary depending on the position of the observer or the shape of the object. However, in the present specification, for convenience of description, directions such as front, rear, left, right, up, and down are shown separately based on when viewed in the F direction.
[58]
In addition, the electrode assembly 120 may be embedded in an internal space of the battery case 130 in an impregnated electrolyte.
[59]
Further, the electrode assembly 120 may be formed in a structure in which a positive electrode, a negative electrode, and a separator are interposed between the positive electrode and the negative electrode, and then wound. At this time, since the electrode assembly 120 is wound and arranged in the form of a jelly roll, it is also called a jelly roll.
[60]
In addition, the electrode plates of the electrode assembly 120 are formed in a structure in which an active material slurry is applied to a current collector, and the slurry is usually stirred while granular active material, a conductive material, a binder, and a plasticizer are added to a solvent. Can be formed.
[61]
In addition, the electrode assembly 120 may be formed with a non-coated portion in which the slurry is not applied at the start and end of the current collector in the direction in which the electrode plates are wound. An electrode lead corresponding to each electrode plate (only the anode lead 146 is shown in FIG. 4) may be attached to the uncoated portion.
[62]
In general, the positive lead 146 is electrically connected to the cap assembly 140 mounted on the open top of the electrode assembly 120, and the negative lead (not shown) is connected to the electrode assembly 120 to provide a battery case. It is electrically connected to 130.
[63]
In addition, the cap assembly 140 includes a top cap 141, a gasket 142, a safety vent 143, a safety device, a current blocking member, and an insulating member.
[64]
Furthermore, a clamping portion 145 may be formed on the upper end of the battery case 130. This clamping portion 145 is a portion for mounting the cap assembly 140 on the open top of the battery case 130. More specifically, the crimping portion 145 may be formed to surround the gasket 142 positioned on the inner surface. In addition, a crimping and pressing process is performed to mount the cap assembly 140 on the battery case 130.
[65]
In addition, the upper surface of the clamping portion 145 of the battery case 130 may be used as the first electrode terminal 111. That is, the upper outer peripheral portion of the cylindrical battery cell 100 may be formed as the first electrode terminal 111. For example, as shown in FIG. 3, the circular outer peripheral portion of the upper end of the cylindrical battery cell 100 may be the first electrode terminal 111 electrically connected to the negative electrode of the electrode assembly 120.
[66]
Here, the top cap 141 is disposed on the uppermost portion of the cap assembly 140 in a shape protruding upward, and is electrically connected to the anode of the electrode assembly 120 to conduct electric current to the outside. The electrode terminal 112 may be formed.
[67]
Specifically, the second electrode terminal 112 may be formed on an upper surface of the top cap 141 of the cap assembly 140. That is, as shown in FIG. 4, the top cap 141 may be the second electrode terminal 112 electrically connected to the positive electrode of the electrode assembly. Furthermore, the top cap 141 may be formed of, for example, a metal material such as stainless steel or aluminum.
[68]
In addition, the cylindrical battery cell 100 according to the present invention may be a lithium secondary battery, and other components of the lithium secondary battery will be described in detail below.
[69]
In general, the lithium secondary battery is composed of a positive electrode, a negative electrode, a separator, and a non-aqueous electrolyte containing a lithium salt. The positive electrode is prepared by, for example, applying a mixture of a positive electrode active material, a conductive material, and a binder on a positive electrode current collector, followed by drying, and if necessary, a filler is further added. The negative electrode is also manufactured by coating and drying a negative electrode material on a negative electrode current collector, and, if necessary, components as described above may be further included.
[70]
5 is a partial perspective view schematically showing some configurations of a cylindrical battery cell according to an embodiment of the present invention. That is, in FIG. 5, the configurations of the first connection plate 155A, the second connection plate 155B, and the fixing cover 158 are removed.
[71]
Referring to FIG. 5 along with FIG. 2, the connection cap 150 may include a cap housing 151, a first connection plate 155A and a second connection plate 155B.
[72]
Here, the cap housing 151 may be formed of an insulating material. Particularly, in the cap housing 151, the battery case 130, the cap assembly 140, the first connection plate 155A, and the portion in contact with the second connection plate 155B are made of an insulating material. Can be done. Alternatively, the cap housing 151 may be entirely made of an electrically insulating material. Here, the electrical insulating material may be, for example, polyvinyl chloride or polyethylene terephthalate.
[73]
Moreover, the cap housing 151 may be mounted on the battery case 130 and the cap assembly 140. In addition, the first connection plate 155A and the second connection plate 155B may be mounted on the cap housing 151.
[74]
Specifically, the cap housing 151 may have a receiving portion 152 configured such that an upper surface is depressed downward to accommodate the first connection plate 155A and the second connection plate 155B therein. have.
[75]
In addition, the cap housing 151 may have an outer wall 151C formed to at least partially surround the outer wall of the battery case 130.
[76]
Moreover, the circular outer peripheral portion of the upper end of the cap housing 151 may be a structure extending from the outer wall 151C of the cap housing 151 upwardly.
[77]
More specifically, the accommodation portion 152 may include a first mounting portion 152A, a second mounting portion 152B, and a partition portion 152C.
[78]
Here, the first mounting portion 152A may be formed on one side of the partition portion 152C to accommodate and fix the first connection plate 155A. In addition, the first mounting portion 152A may have an upper surface lower than the height of the upper surface of the partition portion 152C. That is, an upper surface of the first mounting portion 152A and an upper surface of the partition portion 152C may form a step.
[79]
Further, the first mounting portion 152A may have a shape or size corresponding to at least a partial external shape of the first connection plate 155A.
[80]
Further, the second mounting portion 152B may be formed on the other side of the partition portion 152C to accommodate and fix the second connection plate 155B. In addition, the second mounting portion 152B may have an upper surface lower than the height of the upper surface of the partition portion 152C. That is, the upper surface of the second mounting portion 152B and the upper surface of the partitioning portion 152C may form a step.
[81]
Furthermore, the second mounting portion 152B may have a shape or size corresponding to at least a partial external shape of the second connection plate 155B.
[82]
In other words, the partition part 152C may be formed between the first mounting part 152A and the second mounting part 152B so as to partition the first mounting part 152A and the second mounting part 152B. . In addition, the partition 152C may have a relatively high upper surface than the first mounting portion 152A and the second mounting portion 152B. In addition, a partition wall W may be formed between the first mounting portion 152A and the partition portion 152C. In addition, the partition wall W may be formed to protrude upward so that the electrode terminal 112 and the first connection plate 155A can be electrically insulated from each other.
[83]
Therefore, according to this configuration of the present invention, it is not only easy to mount the first connecting plate 155A and the second connecting plate 155B to the receiving portion 152 of the cap housing 151, but also after mounting. The process of bonding the first connection plate 155A and the second connection plate 155B to the cylindrical battery cell 100 or a bus bar (not shown) is performed as a bar that can maintain a stable mounted state without flow. There is an advantage to be able to proceed smoothly.
[84]
In addition, the cap housing 151 may have an outer peripheral exposed portion 153A and a central exposed portion 153B.
[85]
Here, the outer periphery exposed portion 153A may be formed to be opened to expose the first electrode terminal 111 formed on the outer periphery of the cylindrical battery cell 100 to the outside. Moreover, the outer peripheral exposed portion 153A may be formed to be opened so that the first connection plate 155A can be electrically directly connected (contacted) with the first electrode terminal 111.
[86]
Further, the outer periphery exposed portion 153A may be formed in a form in which both ends of the partition portion 152C in the front-rear direction are opened so that a part of the first electrode terminal 111 may be exposed. Accordingly, a portion of the first connection plate 155A mounted on the first mounting portion 152A may be positioned on the first electrode terminal 111 without interference from the partition portion 152C.
[87]
In addition, the central exposed portion 153B may be formed to be opened so that the second electrode terminal 112 formed in the center of the upper end of the cylindrical battery cell 100 is exposed to the outside. Furthermore, the central exposed portion 153B may be formed so that the second connection plate 155B can be electrically directly connected (contacted) with the second electrode terminal 112.
[88]
Further, the center exposed portion 153B may be formed by opening the center of the partition portion 152C so that a portion of the second electrode terminal 112 may be exposed. In addition, a portion of the second connection plate 155B mounted on the second mounting portion 152B may be positioned on the second electrode terminal 112 without interference from the partition portion 152C. There is no partition wall between the portion 153B and the second mounting portion 152B, and the upper surface of the second electrode terminal 112 and the upper surface of the second mounting portion 152B are parallel to each other, or the second The upper surface of the electrode terminal 112 may be lower than the upper surface of the second mounting portion 152B.
[89]
Accordingly, according to this configuration of the present invention, in the cap housing 151 of the present invention, each of the first connection plate 155A and the second connection plate 155B is a first electrode terminal 111 and a second electrode. In addition to being able to guide the position arranged to be electrically connected to the terminal 112, the first connection plate 155A and the second connection plate 155B can be fixed without flow during the welding process, so welding It can increase efficiency.
[90]
6 is a partial perspective view schematically showing some configurations of a cylindrical battery cell according to an embodiment of the present invention.
[91]
Referring to FIG. 6, the first connection plate 155A and the second connection plate 155B may include an electrode terminal welding portion 156 and a busbar welding portion 157.
[92]
Specifically, the electrode terminal welding part 156 is the first electrode terminal 111 or the second electrode so that the lower surface thereof directly contacts the outer surface of the first electrode terminal 111 or the second electrode terminal 112. It may be located on the terminal 112.
[93]
In addition, the busbar welding part 157 may be connected to one end of the electrode terminal welding part 156 so that an upper surface thereof is exposed upward.
[94]
Moreover, the bus bar welding part 157 is one side of the cylindrical battery cell 100 based on the center of the upper end of the cylindrical battery cell 100 so that the plurality of cylindrical battery cells 100 are electrically connected to each other in series or parallel to each other. Or it may be located on the other side.
[95]
Further, the busbar welding portion 157 may be a portion positioned on the upper surface of the first mounting portion 152A or the second mounting portion 152B.
[96]
For example, as shown in Figs. 5 and 6, when viewed in the F direction shown in Fig. 1, the bus bar welding part 157 of the first connection plate 155A is on the first mounting part 152A. The electrode terminal welding portion 156 may be formed to protrude in the right direction from both ends of the busbar welding portion 157 in the front-rear direction.
[97]
Accordingly, the electrode terminal welding portion 156 of the first connection plate 155A is positioned on the first electrode terminal 111 and may be electrically connected or bonded to the upper surface of the first electrode terminal 111. .
[98]
In addition, for example, as shown in FIGS. 5 and 6, when viewed in the F direction shown in FIG. 1, the bus bar welding portion 157 of the second connection plate 155B is the second mounting portion 152B. ), an electrode terminal welding portion 156 extending protruding from the center of the bus bar welding portion 157 in a left direction may be formed. Accordingly, the electrode terminal welding part 156 may be positioned on the second electrode terminal 112 to be electrically connected or bonded to the upper surface of the second electrode terminal 112.
[99]
Accordingly, according to this configuration of the present invention, the first connection plate 155A and the second connection plate 155B are provided with an electrode terminal welding portion 156 and a busbar welding portion 157, thereby forming an electrode terminal and a connection plate. It is possible to easily perform a welding process between the connection plate and an external conductor such as a bus bar.
[100]
That is, in the present invention, by using the first connection plate 155A and the second connection plate 155B, the width (width) of the first electrode terminal 111 of the cylindrical battery cell 100 is narrow. It can effectively solve problems such as poor welding or a difficult welding operation.
[101]
Further, a convex portion 156B protruding in a left-right direction or a front-rear direction may be formed on an outer periphery of the electrode terminal welding portion 156 of the first connection plate 155A and the second connection plate 155B.
[102]
Specifically, the convex portion 156B may be formed such that the electrode terminal welding portion 156 is inserted and fixed to the outer peripheral exposed portion 153A or the central exposed portion 153B of the cap housing 151. In addition, the convex portion 156B may be formed to protrude outward from both outer peripheries of the electrode terminal welding portions 156 of the first connection plate 155A so as to be in close contact with the outer peripheral exposed portion 153A.
[103]
For example, referring to FIG. 6 along with FIG. 5, the electrode terminal welding portion 156 is inserted between the outer peripheral exposed portions 153A of the electrode terminal welding portion 156 of the first connection plate 155A. Two convex portions 156B may be formed to be fixed.
[104]
Accordingly, according to this configuration of the present invention, the electrode terminal welding portion 156 of the first connection plate 155A and the second connection plate 155B is more stably exposed to the outer periphery of the cap housing 151 ( 153A) or the central exposed portion 153B, respectively, and the first and second connection plates 155A and 155B, and the first and second electrode terminals 111 and 112 There is an advantage of increasing the reliability of the welding process between the two and reducing the defect rate.
[105]
7 is a partial perspective view schematically showing some configurations of a cylindrical battery cell according to an embodiment of the present invention.
[106]
Referring to FIG. 7 together with FIG. 6, the connection cap 150 may further include a fixing cover 158 fixedly coupled to the cap housing 151.
[107]
Specifically, the fixing cover 158 may be configured to cover and fix a part of the upper surfaces of the first connection plate 155A and the second connection plate 155B.
[108]
In addition, the cap housing 151 may be formed such that a guide protrusion 151B for guiding a fixed position of the fixing cover 158 protrudes upward. For example, as illustrated in FIG. 5, two guide protrusions 151B may be formed in the partition 152C of the cap housing 151 to protrude upward.
[109]
In addition, the fixing cover 158 may be provided with a fastener H1 opened so that the guide protrusion 151B can be inserted. For example, as illustrated in FIG. 7, two fixing holes H1 may be formed in the fixing cover 158 such that the guide protrusion 151B is inserted.
[110]
Therefore, according to this configuration of the present invention, the fixing cover 158 can be fixed in place by just fitting the guide protrusion 151B formed on the cap housing 151 and inserting it into the fixing tool H1. , Can effectively increase the manufacturing efficiency.
[111]
Specifically, the fixing cover 158 may have an outer peripheral welding groove H2 and a central welding tool H3 formed therein.
[112]
Here, the outer peripheral welding groove H2 may be formed in an open structure so that the electrode terminal welding portion 156 of the first connection plate 155A is exposed to the outside. That is, the outer circumferential welding groove H2 may have a groove shape inserted from an outer circumference of the fixing cover 158 in an inward direction.
[113]
For example, as illustrated in FIG. 7, the outer peripheral welding groove H2 may be formed at both ends of the fixing cover 158 in contact with the cap housing 151.
[114]
In addition, the central welding tool H3 may be formed in an open structure so that the electrode terminal welding portion 156 of the second connection plate 155B is exposed to the outside. Specifically, the central welding tool (H3) may be formed in the center of the fixing cover (158).
[115]
Therefore, according to this configuration of the present invention, the fixing cover 158 effectively stably attaches the first connection plate 155A and the second connection plate 155B to the receiving portion 152 of the cap housing 151. In addition to being able to be fixed, structures such as an outer peripheral welding groove (H2) and a central welding hole (H3) are formed, so that the first connection plate 155A and the second connection plate 155B and the first electrode To facilitate the welding operation between the terminal 111 and the second electrode terminal 112.
[116]
8 and 9 are partial perspective views schematically showing a process of assembling some components for a cylindrical battery cell according to another embodiment of the present invention.
[117]
8 and 9, the receiving portion 152 of the cap housing 151 may be provided with a locking protrusion 151D to prevent separation from the receiving portion 152 to the outside.
[118]
Specifically, the locking protrusion 151D may have a structure protruding from the inner surface of the receiving portion 152 of the cap housing 151 in a central direction. That is, the locking protrusion 151D may have a structure protruding from the inner surface of the receiving portion 152 in contact with the outer peripheral portion of the upper end of the cap housing 151. In other words, the locking protrusion 151D may have a structure protruding from the upper end of the circular outer circumference of the receiving portion 152 of the cap housing 151 toward the center.
[119]
In addition, the fixing cover 158 may be rotated clockwise or counterclockwise to be fixed and positioned under the locking protrusion 151D after being inserted into the receiving portion 152 of the cap housing 151. have. Further, a stopper 151E protruding in an inward direction may be formed at one end of the locking projection 151D to prevent rotational movement of the fixing member.
[120]
Accordingly, according to this configuration of the present invention, a separate locking protrusion 151D is formed in the cap housing 151 to fix the fixing cover 158, so that the fixing cover 158 is attached to the cap housing 151. Not only can it be stably fixed to the receiving part 152 of the, but also a stopper 151E formed on one side thereof can guide the fixing cover 158 to be fixed in an accurate position, thereby increasing the accuracy of the subsequent welding operation. It can lower the defective rate.
[121]
10 is a cross-sectional view schematically showing a fixed cover that is a part of a cylindrical battery cell according to an embodiment of the present invention. At this time, FIG. 10 shows a state seen by cutting the central portion of the fixed cover 158 in the left and right direction in the front and rear direction when viewed in the F direction.
[122]
Referring to FIG. 10 together with FIGS. 6 and 7, a fixing protrusion 158B may be formed on a lower surface of the fixing cover 158.
[123]
Specifically, the fixing protrusion 158B may have a shape protruding so as to press a portion of the electrode terminal welding portion 156 of the first connection plate 155A in a downward direction. Furthermore, the fixing protrusion 158B may have a shape protruding so as to press a portion of the electrode terminal welding portion 156 of the second connection plate 155B downward.
[124]
For example, as shown in FIG. 10, the fixing protrusion 158B may have a plurality of fixing protrusions 158B in contact with the electrode terminal welding portion 156 of the first connection plate 155A. . In addition, a plurality of fixing protrusions 158B may be formed to contact the electrode terminal welding portion 156 of the second connection plate 155B.
[125]
Accordingly, according to this configuration of the present invention, the fixing protrusion 158B presses the upper portions of the electrode terminal welding portions 156 of the first connection plate 155A and the second connection plate 155B, The first connection plate 155A and the second connection plate 155B, and the first electrode terminal 111 and the second electrode terminal 112 may be in close contact with each other, and the first connection plate 155A and the 2 Reliability of the welding joint between the connection plate 155B and the first electrode terminal 111 and the second electrode terminal 112 may be further improved.
[126]
11 is a partial perspective view schematically showing a battery module according to an embodiment of the present invention.
[127]
Referring to FIG. 11 along with FIG. 7, the battery module 1000 according to an embodiment of the present invention may include a plurality of cylindrical battery cells 100. At this time, the cylindrical battery cells 100, 101, 102, 103, 104, 105, and 106 may be arranged in the left-right direction and the front-rear direction through the arrangement guide part 159 formed in the cap housing 151.
[128]
Here, an array guide part 159 configured to guide the arrangement of the cylindrical battery cells 100, 101, 102, 103, 104, 105, 106 may be formed on the outer wall of the cap housing 151.
[129]
Specifically, the arrangement guide part 159 may be a flat raised structure 159A and a triangular projected structure 159B protruding from the outer wall of the cap housing 151.
[130]
Here, the flat raised structure 159A may be formed to guide the arrangement of the plurality of cylindrical battery cells 100 in the left and right directions when viewed in the F direction. In addition, the flat raised structure 159A may be a flat raised structure 159A in which one surface of the cap housing 151 in the left and right direction is flatly raised from the outer wall in the left and right direction.
[131]
That is, so that one surface of the flat raised structure 159A on one side of the one cylindrical battery cell 100 faces one surface of the flat raised structure 159A of the cap housing 151 of the other cylindrical battery cell 100, Another cylindrical battery cell 100 may be arranged.
[132]
For example, as shown in FIG. 11, cylindrical battery cells 100, 101, 102, and 103 may be arranged in the left and right directions. At this time, each of the cylindrical battery cells 100, 101, 102, 103 may have flat raised structures 159A formed on both sides of the cap housing 151 in the left and right directions, and the cylindrical battery cells 100 and 101 , 102, 103 may be arranged such that each of the flat raised structures 159A face each other.
[133]
In addition, the triangular protrusion structure 159B may be formed to guide an arrangement of a plurality of cylindrical battery cells 100 in the front and rear directions. Specifically, the triangular protrusion structure 159B may be formed in a triangular column shape on an outer wall of the cap housing 151 in the front-rear direction.
[134]
For example, as shown in FIG. 11, one triangular protrusion structure 159B may be formed on an outer wall of the cap housing 151 in the front-rear direction.
[135]
In addition, an inclined surface (FIGS. 7 and 159C) may be formed on the flat raised structure 159A so that the side portions of the cylindrical battery cells 100 arranged in the front-rear direction may be located facing each other.
[136]
That is, on one side of the one cylindrical battery cell 100 in the front-rear direction, one surface of the triangular protrusion structure 159B formed in the other cylindrical battery cell 100 arranged in the front-rear direction, and the other Another cylindrical battery cell 104 may be disposed so that the inclined surfaces (159C1 of FIG. 11) of the flat raised structure 159A formed in the cylindrical battery cell 100 face each other.
[137]
For example, as shown in FIG. 11, one battery module 1000 may include a module housing 300 and cylindrical battery cells 100, 101, 102, 103, 104, 105, and 106. have. In addition, inside the module housing 300, four cylindrical battery cells 100, 101, 102, 103 are arranged in the left-right direction, and the four cylindrical battery cells 100, 101, 102, 103 Three cylindrical battery cells 104, 105, and 106 may be disposed in the rear direction.
[138]
At this time, the three cylindrical battery cells 104, 105, 106 are one surface of the triangular protrusion structure 159B, and the inclined surface 159C of the flat raised structure 159A formed on the one cylindrical battery cell 100 They are guided to face each other, and may be uniformly disposed behind the four cylindrical battery cells 100, 101, 102, and 103.
[139]
Accordingly, according to this configuration of the present invention, the present invention can uniformly and easily arrange the arrangement of the cylindrical battery cells in the left and right directions and the front and rear directions using the arrangement guide portion 159 formed in the cylindrical battery cell 100.
[140]
In addition, the present invention may provide an electronic device including at least one or more of the battery modules. Specifically, the electronic device may include a case for accommodating the battery module therein. Further, the electronic device may include a battery management unit (BMS) configured to control the battery module.
[141]
Meanwhile, in the present specification, terms indicating directions such as up, down, left, right, before, and after are used, but these terms are for convenience of description only, and may vary depending on the location of the object or the observer. It is obvious to those skilled in the art of the present invention.
[142]
[143]
As described above, although the present invention has been described by a limited number of embodiments and drawings, the present invention is not limited thereto, and the technical idea of ​​the present invention and the following will be described by those skilled in the art to which the present invention pertains. Of course, various modifications and variations are possible within the equivalent scope of the claims to be described.
[144]
[Description of codes]
[145]
100: cylindrical battery cell 155A: first connection plate
[146]
111: first electrode terminal 155B: second connection plate
[147]
112: second electrode terminal 156: electrode terminal welding portion
[148]
120: electrode assembly 157: busbar welding portion
[149]
130: battery case 158: fixing cover
[150]
140: cap assembly H1: fixture
[151]
150: connection cap H2: outer peripheral welding groove
[152]
151: cap housing H3: center welding hole
[153]
152: receiving portion 159: array guide portion
[154]
153A: exposed portion of the outer periphery 159A: flat raised structure
[155]
153B: Center exposed portion 159B: Triangular projection structure
[156]
151B: guide projection 159C, 159C1: slope
[157]
151E: stumbling jaw
Industrial availability
[158]
The present invention relates to a cylindrical battery cell and a battery module including a plurality of the same. In addition, it can be used in an electronic device including a cylindrical battery cell and a battery module of the present invention, an energy storage system, or an automobile-related industry.

Claim
[Claim 1]
A cylindrical battery cell having a first electrode terminal and a second electrode terminal having different polarities, respectively, formed at the upper outer circumference and the center, wherein the electrode assembly has a positive electrode, a negative electrode, and a separation membrane interposed between the positive electrode and the negative electrode; A battery case in which the electrode assembly is impregnated with an electrolyte solution; A cap assembly mounted on the open top of the battery case; And a cap housing mounted on the battery case and the cap assembly and having an insulating material, and a first configured to be mounted on the cap housing and electrically connected to each of the first electrode terminal and the second electrode terminal. Cylindrical battery cell comprising a connection cap provided with a connection plate and a second connection plate.
[Claim 2]
The cylindrical battery cell according to claim 1, wherein the cap housing is formed with a receiving portion configured such that an upper surface is recessed downward to accommodate the first connection plate and the second connection plate therein.
[Claim 3]
The apparatus of claim 2, wherein the receiving portion comprises: a first mounting portion configured to receive and fix the first connection plate; A second mounting portion configured to receive and fix the second connection plate; And a partition portion formed between the first mounting portion and the second mounting portion to partition the first mounting portion and the second mounting portion.
[Claim 4]
According to claim 2, The cap housing, The outer peripheral exposed portion is opened to expose the first electrode terminal formed on the outer peripheral portion to the outside; And a center exposed portion opened to expose the second electrode terminal formed in the center to the outside.
[Claim 5]
According to claim 4, The first connection plate and the second connection plate, Electrode terminal welding portion positioned on each of the first electrode terminal and the second electrode terminal such that a lower surface directly contacts the outer surface of the electrode terminal; And a bus bar welding part connected to one end of the electrode terminal welding part so that an upper surface thereof is exposed in an upward direction.
[Claim 6]
The cylindrical battery cell according to claim 3, wherein the connection cap further comprises a fixed cover coupled to the cap housing to cover and fix a portion of the upper surfaces of the first connection plate and the second connection plate. .
[Claim 7]
The method of claim 6, wherein the cap housing has a guide protrusion protruding upward to guide the fixing position of the fixing cover, and an opening fastener is formed in the fixing cover so that the guide protrusion can be inserted. Cylindrical battery cell.
[Claim 8]
According to claim 6, The fixing cover, The outer peripheral welding groove is opened so that the electrode terminal welding portion of the first connection plate is exposed to the outside; And a central welding hole opened so that the electrode terminal welding portion of the second connection plate is exposed to the outside.
[Claim 9]
The cylindrical battery cell according to claim 6, wherein the cap housing includes a locking protruding protruding in a central direction to prevent the fixing cover from being separated from the receiving part.
[Claim 10]
The cylindrical battery cell according to claim 1, wherein an arrangement guide part configured to guide an arrangement of a plurality of cylindrical battery cells is formed on an outer wall of the cap housing.
[Claim 11]
The method of claim 10, wherein the arrangement guide part is provided with a flat raised structure having a flat surface in the left and right directions to guide the arrangement of the plurality of cylindrical battery cells in the left and right directions on both outer walls of the cap housing, and the cap housing Cylindrical battery cells, characterized in that provided with a triangular protrusion structure formed to guide the arrangement of the plurality of cylindrical battery cells in the front-rear direction on the outer wall of the front-rear direction.
[Claim 12]
A battery module comprising a plurality of cylindrical battery cells according to any one of claims 1 to 11.
[Claim 13]
An electronic device comprising the battery module according to claim 12.