Title of the invention: Battery module with rail-type socket and battery pack including same
technical field
[One]
This application claims the benefit of priority based on Korean Patent Application No. 2020-0017410 dated February 13, 2020, and all contents disclosed in the literature of the Korean patent application are incorporated as a part of this specification.
[2]
The present invention relates to a battery module having a rail-type socket and a battery pack including the same, and more particularly, to a single battery cell assembly by connecting a plurality of battery cells in parallel with a rail-type socket, and the battery cell assembly The present invention relates to a battery module having a rail-type socket that can contribute to material cost reduction and production time reduction by being connected in series by a connecting member, and a battery pack including the same.
background
[3]
As technology development and demand for mobile devices such as cell phones, laptops, camcorders, and digital cameras increase, technologies related to rechargeable batteries that can be charged and discharged are becoming active. In addition, secondary batteries are applied to electric vehicles (EVs), hybrid electric vehicles (HEVs), plug-in hybrid electric vehicles (P-HEVs), etc. as an alternative energy source for fossil fuels that cause air pollutants. The need for development is increasing day by day.
[4]
Currently commercialized secondary batteries include nickel-cadmium batteries, nickel-hydrogen batteries, nickel-zinc batteries, and lithium secondary batteries. Among them, lithium secondary batteries have little memory effect compared to nickel-based secondary batteries, so they can be charged and discharged freely. , the self-discharge rate is very low and the energy density is high.
[5]
On the other hand, when the secondary battery as described above is used in a device requiring a large capacity and high voltage, such as an electric vehicle, it is used in the form of a battery cell assembly or battery pack having a structure in which a plurality of battery cells are arranged.
[6]
1 is a perspective view of a battery pack including a cylindrical battery cell according to the prior art, FIG. 2 is a vertical cross-sectional view of the cylindrical battery cell according to the prior art.
[7]
Referring to FIGS. 1 and 2 , the battery module 1 is formed on one side of the cell frame 20 , which is open so that the electrodes of the secondary battery cells 10 can be exposed to the outside, and the cylindrical secondary battery cell 10 . Cylindrical cell connection detachable bus bar in which the negative connecting member 30 and the positive connecting member 40 are bonded to the negative and positive terminals, the negative connecting member 30 is bonded to one side and the positive connecting member 40 is bonded to the other side (50).
[8]
In addition, the cylindrical secondary battery cell 10 includes a battery case 70 accommodating the jelly-roll type electrode assembly 60 and a cap assembly 80 positioned above the battery case 70, and the cap assembly 80 ), a top cap 81 is located at the upper end of the top cap 81, and a venting member 82 for blocking current at high temperatures, a safety vent for discharging high-pressure gas, and a current for blocking current when the internal pressure of the battery rises Disclosed is a structure in which blocking elements are sequentially stacked.
[9]
As described above, in the related art, many conductors are used to connect a plurality of battery cells in series and/or in parallel, and it is necessary to separate the conductors from the cathodes and anodes of the battery cells, so a plastic-based insulator frame is used. In addition, there is a problem in that the production cost and production time increase by curing the adhesive after using the fixing adhesive to fix the conductor to the insulator frame.
[10]
In this regard, in Korean Patent Application Laid-Open No. 2018-0129115, a plurality of openings corresponding to the external shape of the secondary battery cells are formed, and the openings are open so that the electrodes of the secondary battery cells can be exposed to the outside. A battery module is disclosed in which cylindrical secondary battery cells accommodated in a cell frame are connected in parallel in a row direction by a negative connecting member, a positive connecting member, and a bus bar through a frame, and each row and each row are connected in series with each other.
[11]
According to the prior literature, by using an open cell frame, a positive electrode connection member and a negative electrode connection member, even if the heights of secondary battery cells are different, the adhesion between the secondary battery and the bus bar is increased to reduce the defect rate during laser welding and improve the production time so that it could be mass-produced.
[12]
However, the prior art still has problems in that high cost is generated by using auxiliary materials such as an adhesive for fixing and an insulator frame, and the curing time is long, so the manufacturing time is still long.
[13]
(Prior art literature)
[14]
(Patent Document 1) Korea Patent Publication No. 2018-0129115
[15]
(Patent Document 2) Korean Patent Publication No. 2019-0136202
DETAILED DESCRIPTION OF THE INVENTION
technical challenge
[16]
In order to solve the above problems, the present invention connects cylindrical battery cells in series and in parallel to minimize materials used in manufacturing the battery module and to reduce the manufacturing time. and a battery pack including the same.
means of solving the problem
[17]
A battery module according to the present invention for solving the above problems includes: a plurality of battery cell assemblies in which two or more cylindrical battery cells 100 are connected in parallel; And in the battery module in which the plurality of battery cell assemblies are connected in series, the parallel-connected battery cell assembly is electrically connected to the negative poles of two or more cylindrical battery cells 100 by a rail-type socket 200, and the battery cell The series connection between the assemblies is characterized in that the rail-type socket 200 and the positive poles of the battery cells 100 constituting the adjacent battery cell assembly are electrically connected by the connecting member 300 .
[18]
In addition, in the battery module according to the present invention, the connection member 300 is characterized in that it has a wire shape of a conductive material or a plate shape having a predetermined width.
[19]
In addition, in the battery module according to the present invention, the cylindrical battery cell 100 includes a cell case 110 having a lower surface and a side surface applied as a negative electrode, and a positive electrode terminal 121 protruding a predetermined height from the center of the upper surface, the side surface It is characterized in that a groove portion 111 recessed to a predetermined depth inward is formed at a predetermined position.
[20]
In addition, in the battery module according to the present invention, the rail-type socket 200 has a predetermined width and length and extends downward from the upper surface portion 210 in which a plurality of through holes 211 are formed, and the upper surface portion 210 . It is characterized in that it includes a pair of side parts 220.
[21]
Also, in the battery module according to the present invention, the side part 220 includes a first extension part 221 in close contact with the side surface of the battery cell 100 , and one side connected to the first extension part 221 , It is characterized in that it includes a bent portion 222 that is seated in the groove portion 111 of the battery cell (100).
[22]
In addition, in the battery module according to the present invention, the side part 220 includes a first extension part 221 in close contact with the side surface of the battery cell 100 , and one side of the battery cell is connected to the first extension part 221 . A bent portion 222 seated in the groove portion 111 of 100, and a second extension portion 223 having one side connected to the bent portion 222 and in close contact with the side surface of the battery cell 100 are sequentially provided. characterized by being
[23]
In addition, in the battery module according to the present invention, the cross-section of the bent portion 222 is characterized in that the cross-section of the groove portion 111 of the battery cell 100 has the same shape.
[24]
In addition, in the battery module according to the present invention, the inner diameter of the through hole 211 is characterized in that larger than the outer diameter of the top cap (120).
[25]
Also, in the battery module according to the present invention, the positive electrode terminal 121 passes through the through hole 211 of the upper surface portion 210 and protrudes at a predetermined height.
[26]
In addition, in the battery module according to the present invention, the upper surface edge of the cell case 110 and the upper surface portion 210 of the rail-type socket 200 is characterized in that the bottom surface is in close contact.
[27]
Also, in the battery module according to the present invention, the rail-type socket 200 includes a nickel material, and the connection member 300 includes an aluminum material.
[28]
In addition, the battery pack according to the present invention includes the above-described battery module; and a pack case 410 in which an accommodating hole 411 is formed to accommodate a plurality of cell cases 110 .
[29]
In addition, the device according to the present invention is characterized in that it includes the above-described battery pack.
Effects of the Invention
[30]
According to the battery module having a rail-type socket according to the present invention and a battery pack including the same, since a plurality of cylindrical battery cells can be connected in parallel using a single rail-type socket, the use of materials can be minimized as well. However, there is an advantage that the assembly time can be shortened.
[31]
In addition, according to the battery module provided with the rail-type socket and the battery pack including the same according to the present invention, the battery cell assemblies connected in parallel by the rail-type socket are serially connected to each battery cell and the rail-type socket by a connecting member directly. There is an advantage that a battery module having a structure can be obtained, and thus an insulator, an adhesive, etc. are not required, thereby reducing production cost and production time.
[32]
Furthermore, according to the battery module provided with the rail-type socket according to the present invention and the battery pack including the same, since the bent portion of the rail-type socket is in close contact with the groove portion of the battery cell, there is an advantage that the battery cells can be more stably supported.
Brief description of the drawing
[33]
1 is a perspective view of a battery pack including a cylindrical battery cell according to the prior art.
[34]
2 is a vertical cross-sectional view of a cylindrical battery cell according to the prior art.
[35]
3 is a perspective view of a battery cell according to a first preferred embodiment of the present invention.
[36]
4 is a perspective view of a rail-type socket according to a first preferred embodiment of the present invention.
[37]
5 is a perspective view of a battery module in which a battery cell and a rail-type socket are combined according to a first preferred embodiment of the present invention.
[38]
6 is a perspective view of a rail-type socket according to a second preferred embodiment of the present invention.
[39]
7 is a perspective view of a battery pack according to a first preferred embodiment of the present invention.
[40]
8 is an exploded perspective view of the battery pack shown in FIG. 7 .
Modes for carrying out the invention
[41]
In the present application, terms such as "comprises", "have" or "comprises" are intended to designate that the features, numbers, steps, components, parts, or combinations thereof described in the specification exist, and are intended to indicate that one or more other It should be understood that this does not preclude the possibility of addition or presence of features or numbers, steps, operations, components, parts, or combinations thereof.
[42]
In addition, the same reference numerals are used throughout the drawings for parts having similar functions and functions. Throughout the specification, when it is said that a part is connected to another part, it includes not only a case in which it is directly connected, but also a case in which it is indirectly connected with another element interposed therebetween. In addition, the inclusion of any component does not exclude other components unless otherwise stated, but means that other components may be further included.
[43]
[44]
Hereinafter, a battery module having a rail-type socket according to the present invention and a battery pack including the same will be described.
[45]
3 is a perspective view of a battery cell according to a first preferred embodiment of the present invention. 3 is a cylindrical battery cell according to the present invention, which accommodates an electrode assembly (not shown) and is electrically connected to the negative lead of the electrode assembly, and includes a cell case 110 and a top cap 120 positioned above the cell case 110 . ) is included.
[46]
Here, a groove portion 111 recessed inwardly is formed at a predetermined position on the upper side of the cell case 110 , and the bent portion of the rail-type socket is seated in the groove portion 111 , and a detailed description thereof will be described later.
[47]
The top cap 120 does not conduct electricity with the cell case 110 through an insulating member (not shown), and functions as a positive terminal by being electrically connected to the positive lead of the electrode assembly.
[48]
Here, the upper surface of the cell case 110 is positioned along the outer periphery of the top cap 120 with the insulating member interposed therebetween so that the cell case 110 and the top cap 120 can be fixed to each other, the top cap 120 . It is preferable to protrude from the top surface of the silver cell case 110 , and it is more preferable that the positive electrode terminal 121 protruding upward is additionally provided in the center of the top cap 120 . This is to facilitate the mounting of the rail-type socket according to the present invention in connecting the plurality of battery cells 100 in series and in parallel, and further to reliably block different electrodes from being connected to each other.
[49]
On the other hand, the electrode assembly includes a cell assembly and a lead, and the cell assembly is a jelly-roll type cell assembly having a structure in which a separator is interposed between a long sheet-type positive electrode and a negative electrode and then wound, or a rectangular positive electrode and a negative electrode between the separator A stack-type cell assembly composed of unit cells having a structure that is stacked in a state of being interposed in a stack-folding type cell assembly in which unit cells are wound by a long separation film, or stacked in a state in which unit cells are interposed with a separator It may be made of a lamination-stack type cell assembly, etc. which are attached to each other, but is not limited thereto.
[50]
Among the pair of leads consisting of a positive lead and a negative lead, the positive lead is directly or indirectly connected to the positive electrode and the top cap of the cell assembly, the negative lead is electrically connected to the cell case, and the electrode constituting the cylindrical battery cell as described above Since the assembly corresponds to generally known configurations, a more detailed description will be omitted.
[51]
4 is a perspective view of a rail-type socket according to a first preferred embodiment of the present invention, and FIG. 5 is a perspective view of a battery module in which a battery cell and a rail-type socket are combined according to a first preferred embodiment of the present invention.
[52]
First, the rail-type socket 200 according to the present invention is for configuring a first battery cell assembly by connecting a plurality of cylindrical battery cells 100 arranged in parallel to each other in parallel.
[53]
Specifically, the rail-type socket 200 is configured to include an upper surface portion 210 and a side portion 220, and the upper surface portion 210 may be a thin flat plate-type having a predetermined thickness and length. For example, the width (X-axis direction) of the upper surface part 210 may be the same as or similar to the outer diameter of the cell case 110 , and the length (Z-axis direction) is the total length of the battery cells 100 to be connected in parallel. may be the same or similar to
[54]
Here, the lower surface of the upper surface 210 of the rail-type socket 200 may be positioned to be spaced apart from the upper surface of the cell case 110 by a predetermined distance, but the cell case corresponding to the negative terminal to enable reliable fixing and electrical connection ( 110) is more preferably in close contact with the upper surface edge.
[55]
A plurality of through-holes 211 having an inner diameter of a predetermined size, specifically, larger than the outer diameter of the top cap 120 are formed in the upper surface portion 210, the through-holes 211 are formed in the upper part of the cell case 110 with a rail-type socket ( When the 200) is seated, the top cap 120 is exposed to the outside so that the upper surface part 210 and the top cap 120 come into contact with each other to prevent a short circuit from occurring.
[56]
The side part 220 is made of a pair extending downward from the upper surface part 210 and is for connecting a plurality of cylindrical battery cells 100 located nearby in parallel and at the same time fixing and supporting them to each other.
[57]
For example, the first extension portion 221 in which the side portion 220 is in close contact with the side surface of the battery cell 100, and one side connected to the first extension portion 221, the groove portion 111 of the battery cell 100 may be formed of a bent portion 222 that is seated on the . In this case, it is possible to firmly fix the battery cells 100 .
[58]
Here, it is more preferable that the contours of the groove 111 and the bent portion 222 of the battery cell 100 are the same so that a gap does not occur when the bent portion 222 is seated in the groove portion 111 .
[59]
On the other hand, the rail-type socket 200 acting as a negative electrode may be configured to include a nickel material, but is not particularly limited as long as it is a material that can be used as the negative electrode material.
[60]
Subsequently, the first battery cell assemblies connected in parallel by the above-described rail-type socket 200 are connected in series again.
[61]
For example, as shown in FIG. 5 , six cylindrical battery cells 100 form a battery cell assembly by one rail-type socket 200 , and these three battery cell assemblies may be connected in series again.
[62]
When describing the series connection between the battery cell assemblies in detail, the top cap 120 or the positive terminal 121 protruding above the through hole 211 of the rail-type socket 200 and the rail-type socket ( 200), and more specifically, the connection member 300 made of a conductive material is positioned between the upper surface portions 210 to be connected.
[63]
Here, the connecting member 300 is preferably in the form of a wire or a plate having a predetermined width, and the top cap 120 or the positive terminal 121 of the battery cell 100 and the rail-type socket 200 are individually formed. It is more preferable that the connecting members 300 are provided as many as the number of the battery cells 100 so that they can be respectively connected, and this is to prevent excessive resistance caused by a decrease in the surface area of ​​the connecting members 300 .
[64]
On the other hand, the connecting member 300 acting as an anode may be configured to include an aluminum material, but is not particularly limited as long as it is a material that can be used as the anode material.
[65]
6 is a perspective view of a rail-type socket according to a second preferred embodiment of the present invention. Since it is the same as the first embodiment of the present invention except for the configuration in which the second extension part 223 is additionally provided on the side part 220 of the rail-type socket 200, hereinafter, the second extension part 223 is attached to the second extension part 223. I will only explain about it.
[66]
The side part 220 of the rail-type socket according to the second embodiment of the present invention has a first extension part 221 in close contact with the side surface of the battery cell 100 , and one side is connected to the first extension part 221 , the battery A bent portion 222 seated in the groove portion 111 of the cell 100 , and a second extension portion 223 having one side connected to the bent portion 222 and closely contacting the side surface of the battery cell 100 are sequentially provided. has been
[67]
When the second extension portion 223 of a predetermined height (Y-axis direction) is additionally provided on the side portion 220 of the rail-type socket, there is an advantage in that the battery cells 100 can be more reliably fixed.
[68]
7 is a perspective view of a battery pack according to a first preferred embodiment of the present invention, and FIG. 8 is an exploded perspective view of the battery pack shown in FIG. 7 .
[69]
The battery pack according to the present invention may be in a state in which the battery module having the above-described configuration is accommodated in the pack case 410 .
[70]
For example, the pack case 410 is provided with a receiving hole 411 to accommodate the plurality of cell cases 110 . Therefore, even if there is an external shock, the movement of the battery cells 100 can be suppressed, resulting in stable electricity. supply is possible.
[71]
In the present invention, the battery pack may be mounted in a device, and specific examples of the device may be a car, a mobile phone, and a notebook computer. These devices have various and complex functions and require a lot of electrical energy to emit high capacity and high voltage. It is installed and serves to supply power to the device.
[72]
[73]
As the specific part of the present invention has been described in detail above, for those of ordinary skill in the art, these specific descriptions are only preferred embodiments, and the scope of the present invention is not limited thereby, It is obvious to those skilled in the art that various changes and modifications can be made within the scope and spirit of the present invention, and it is natural that such variations and modifications fall within the scope of the appended claims.
[74]
(Explanation of symbols)
[75]
100: battery cell
[76]
110: cell case
[77]
111: groove
[78]
120: top cap
[79]
121: positive terminal
[80]
200: rail-type socket
[81]
210: upper surface
[82]
211: through hole
[83]
220: side part
[84]
221: first extension 222: bent part
[85]
223: second extension
[86]
300: connecting member
[87]
400 : battery pack
[88]
410: pack case
[89]
411: reception hall
Claims
[Claim 1]
a plurality of battery cell assemblies in which two or more cylindrical battery cells are connected in parallel; And in the battery module in which the plurality of battery cell assemblies are connected in series, in the parallel connected battery cell assembly, negative electrodes of two or more cylindrical battery cells are electrically connected by a rail-type socket, and the series connection between the battery cell assemblies is A battery module, characterized in that the positive electrode of the battery cells constituting the battery cell assembly adjacent to the rail-type socket is electrically connected by a connecting member.
[Claim 2]
The battery module according to claim 1, wherein the connecting member has a wire shape of a conductive material or a plate shape having a predetermined width.
[Claim 3]
The cylindrical battery cell according to claim 1, wherein the cylindrical battery cell includes a cell case having a lower surface and a side surface applied as a negative electrode, and a positive electrode terminal protruding at a predetermined height in the center of the upper surface, and a groove recessed to a predetermined depth inward is formed at a predetermined position on the side surface. A battery module, characterized in that.
[Claim 4]
The battery module according to claim 3, wherein the rail-type socket has a predetermined width and length and includes an upper surface portion having a plurality of through-holes formed therein, and a pair of side portions extending downward from the upper surface portion.
[Claim 5]
The method of claim 4, wherein the side portion comprises a first extension portion in close contact with the side surface of the battery cell, and a bent portion seated in the groove portion of the battery cell with one side connected to the first extension portion. battery module.
[Claim 6]
According to claim 4, wherein the side portion, a first extension portion in close contact with the side surface of the battery cell, a bent portion seated in the groove portion of the battery cell with one side connected to the first extension portion, and one side of the bent portion and A battery module, characterized in that the second extension is sequentially connected and closely contacting the side of the battery cell.
[Claim 7]
The battery module according to claim 5 or 6, wherein a cross-section of the bent portion has the same shape as a cross-section of the groove portion of the battery cell.
[Claim 8]
The battery module according to claim 5 or 6, wherein an inner diameter of the through hole is larger than an outer diameter of the top cap.
[Claim 9]
The battery module according to claim 8, wherein the positive terminal protrudes by a predetermined height through the through hole of the upper surface portion.
[Claim 10]
The battery module according to claim 9, wherein an edge of the upper surface of the cell case and the lower surface of the upper surface of the rail-type socket are in close contact with each other.
[Claim 11]
The battery module according to claim 1, wherein the rail-type socket includes a nickel material, and the connecting member includes an aluminum material.
[Claim 12]
The battery module according to any one of claims 1 to 6; and a pack case in which an accommodating hole is formed to accommodate a plurality of cell cases.
[Claim 13]
A device provided with the battery pack according to claim 12 .