Specification
Title of the Invention: Battery module including module busbar, and battery pack including same, and electronic device
technical field
[One]
The present invention relates to a battery module including a module busbar, a battery pack including the same, and an electronic device, and more particularly, to a battery module having a module busbar having excellent durability while quickly forming an electrical disconnection when a high current flows. will be.
[2]
This application is a priority claim application for Korean Patent Application No. 10-2020-0043499 filed on April 09, 2020, 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 laptops, video cameras, and mobile phones has rapidly increased and the development of electric vehicles, energy storage batteries, robots, satellites, etc. is in full swing, high-performance secondary batteries that can be repeatedly charged and discharged research is being actively conducted.
[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 almost no 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, attracting attention.
[5]
Such a lithium secondary battery mainly uses a lithium-based oxide and a carbon material as a positive electrode active material and a negative electrode active material, respectively. In addition, such a lithium secondary battery includes an electrode assembly in which a positive electrode plate and a negative electrode plate to which a positive electrode active material and a negative electrode active material are applied, respectively, are disposed with a separator interposed therebetween, and a casing for sealing and housing the electrode assembly together with an electrolyte, that is, a battery case. .
[6]
In addition, the lithium secondary battery may be classified into a can-type secondary battery in which an electrode assembly is embedded in a metal can and a pouch-type secondary battery in which an electrode assembly is embedded in a pouch of an aluminum laminate sheet, depending on the shape of the exterior material.
[7]
Among them, in the can-type secondary battery, a metal can in which an electrode assembly is embedded may be manufactured in a cylindrical shape. Such a can-type secondary battery may be used to construct a battery module including a housing accommodating a plurality of secondary batteries and a bus bar configured to electrically connect the plurality of secondary batteries.
[8]
Recently, a bus bar provided in such a battery module may use a material having a rather high electrical resistance in order to improve weldability of resistance welding with an electrode terminal.
[9]
In the prior art, when an electrical short occurs between some secondary batteries among a plurality of secondary batteries built into a battery module, and a high current flows through a bus bar in some secondary batteries, a product using the battery module may fail. can To this end, the current can be cut off using a battery management system (BMS), but when the BMS does not operate or malfunction, a fuse that is disconnected when a high current flows in a portion of the bus bar is sometimes applied to cope with the high current.
[10]
In this case, the fuse of the bus bar is formed to have a smaller thickness or a narrower width than other portions of the bus bar in order to set a large electrical resistance. However, since the fuse of such a thin or narrow bus bar has relatively weak mechanical rigidity, when an external shock or frequent vibration occurs in the battery module, disconnection may occur due to damage or cut, etc. It became a factor that reduced the durability of the module.
DETAILED DESCRIPTION OF THE INVENTION
technical challenge
[11]
Accordingly, the present invention has been devised to solve the above problems, and an object of the present invention is to provide a battery module having a module busbar having excellent durability while quickly forming an electrical disconnection when a high current flows.
[12]
Other objects and advantages of the present invention may be understood by the following description, and will become more clearly understood by the examples of the present invention. It will also be readily apparent that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the appended claims.
means of solving the problem
[13]
The battery module according to the present invention for achieving the above object,
[14]
a plurality of battery cells having electrode terminals formed thereon;
[15]
a module housing having an internal space configured to accommodate the plurality of battery cells; and
[16]
and a module bus bar configured to electrically connect the plurality of battery cells,
[17]
The module bus bar,
[18]
a first metal plate provided with a first body portion positioned to face an outer surface of the module housing, and a first connection portion configured to be in contact with the electrode terminal; and
[19]
A second body portion stacked on the outside of the first body portion of the first metal plate, a second connection portion configured to be in contact with the electrode terminal, and electrically connecting the second connection portion and the second body portion to a predetermined current or more and a fuse unit configured to be disconnected from the , and a second metal plate having a thickness smaller than that of the first metal plate.
[20]
In addition, the second metal plate,
[21]
A reinforcing part formed between the second connection part and the fuse part and formed wider than the width of the fuse part may be provided.
[22]
Moreover, the module housing,
[23]
and a connection opening perforated so that the electrode terminal of the battery cell accommodated in the inner space is exposed to the outside;
[24]
The reinforcement part,
[25]
A portion may be bent inside the module housing through the connection opening.
[26]
And, the reinforcing part,
[27]
It may be bonded to at least one of an edge of the connection opening and a periphery of the connection opening.
[28]
In addition, the second metal plate,
[29]
A reinforcing member configured to surround a connection portion between the fuse unit and the second body unit may be provided.
[30]
Furthermore, the first metal plate and the second metal plate are each formed with a fixture perforated in the vertical direction,
[31]
The module housing,
[32]
It may include a fixing protrusion inserted into the fixture to fix each of the first metal plate and the second metal plate, and a cushion member interposed between the fixture and the fixing protrusion.
[33]
And, the second metal plate,
[34]
A metal material having a higher resistivity than the metal material of the first metal plate may be provided.
[35]
In addition, the fuse unit,
[36]
is bent at least once or more based on the direction extending from the second body part,
[37]
At least two welding portions arranged in a direction perpendicular to a bending direction of the fuse portion in a horizontal direction and welded to the electrode terminal may be formed on the second connection portion.
[38]
And, the battery pack according to the present invention for achieving the above object includes at least one or more of the battery modules.
[39]
In addition, the electronic device according to the present invention for achieving the above object includes the battery pack.
Effects of the Invention
[40]
According to one aspect of the present invention, the module bus bar of the present invention includes a first metal plate and a second metal plate positioned outside the first metal plate and formed to have a thinner thickness than the first metal plate, can improve the durability of That is, since the relatively thick first metal plate has relatively better rigidity against vibration or impact than the second metal plate, the first body portion of the first metal plate is disposed to face the outer surface of the module housing, Since the second body portion of the second metal plate is disposed on the outside of the first body portion, it is possible to effectively reduce damage caused by shock and continuous vibration of the module housing transmitted to the module busbar.
[41]
In addition, according to one aspect of the embodiment of the present invention, the second metal plate, the second connection portion and the connection portion of the fuse portion, when vibration or shock is transmitted, the risk of being cut relatively compared to other portions due to the narrow width of the fuse portion Therefore, by providing a reinforcing part formed wider than the width of the fuse part between the second connection part and the fuse part, the mechanical rigidity of the connection part of the second connection part and the fuse part can be reinforced. Durability can be further improved.
[42]
Furthermore, according to one aspect of an embodiment of the present invention, in the present invention, the fuse part is bent at least once based on the direction extending from the second body part, and the second connection part has a horizontal direction in the bent direction of the fuse part. At least two or more welding parts arranged in a vertical direction and welded to the electrode terminal are formed, so that when the fuse part is pulled by an external force, the bonded state by the strong bonding force of the at least two or more welding parts arranged in the vertical direction is effectively can be maintained Accordingly, durability of the battery module can be effectively increased.
[43]
And, according to one aspect of another embodiment of the present invention, the present invention provides a cushioning member interposed between the fixing protrusion inserted into the fixture to fix each of the first metal plate and the second metal plate, and the fixture and the fixing protrusion. By providing the cushion member, the cushion member absorbs vibration or shock transmitted from the module housing to the module bus bar, thereby effectively reducing damage caused by frequent vibration and impact of the module bus bar.
Brief description of the drawing
[44]
The following drawings attached to this specification illustrate preferred embodiments of the present invention, and serve to further understand the technical spirit 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 should not be construed as being limited to
[45]
1 is a perspective view schematically showing a battery module according to an embodiment of the present invention.
[46]
2 is a perspective view schematically illustrating a module bus bar that is a part of a battery module according to an embodiment of the present invention.
[47]
3 is a perspective view schematically illustrating bus bars and a plurality of battery cells that are part of a battery module according to an embodiment of the present invention.
[48]
4 is a partial front view schematically illustrating an enlarged state of area A of FIG. 1 .
[49]
5 is a partial front view schematically showing a module bus bar that is a part of a battery module according to another embodiment of the present invention;it is do
[50]
6 is a partial cross-sectional view schematically illustrating a part of the battery module cut along the line C-C' of FIG. 5 .
Modes 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 their ordinary or dictionary meanings, and the inventor should properly understand the concept of the term in order to best describe his invention. Based on the principle that it can be defined, it should be interpreted as meaning and concept consistent with the technical idea of ​​the present invention.
[52]
Accordingly, the configuration shown in the embodiments and drawings described in the present specification is merely the most preferred embodiment of the present invention and does not represent all of the technical spirit of the present invention, so at the time of the present application, various It should be understood that there may be equivalents and variations.
[53]
[54]
1 is a perspective view schematically showing a battery module according to an embodiment of the present invention. 2 is a perspective view schematically illustrating a module bus bar that is a part of a battery module according to an embodiment of the present invention. 3 is a perspective view schematically illustrating bus bars and a plurality of battery cells that are part of a battery module according to an embodiment of the present invention. And, FIG. 4 is a partial front view schematically showing a state in which area A of FIG. 1 is enlarged. For reference, in FIG. 1 , the positive direction of the X axis is the right direction, the negative direction of the X axis is the left direction, the positive direction of the Z axis is the upward direction, the negative direction of the Z axis is the downward direction, and the positive direction of the Y axis is the downward direction. The direction is the backward direction, and the negative direction of the Y-axis is the forward direction.
[55]
1 to 4 , the battery module 200 according to an embodiment of the present invention may include a plurality of battery cells 100 , a module housing 210 , and a plurality of module bus bars 220 . can
[56]
Here, the battery cell 100 may be a cylindrical battery cell. The cylindrical battery cell 100 may include a cylindrical battery can 116 and an electrode assembly (not shown) accommodated in the battery can 116 .
[57]
In addition, the battery can 116 includes a material with high electrical conductivity, for example, the battery can 116 may include an aluminum or copper material.
[58]
Furthermore, the battery can 116 may be configured in a shape that is long laid down in the front-rear direction. In addition, the battery can 116 may have a cylindrical shape extending in the vertical direction. Furthermore, electrode terminals 111 and 112 may be formed at the front and rear ends of the battery can 116 that is laid down.
[59]
Specifically, the electrode terminal may include a positive terminal 111 and a negative terminal 112 . A positive terminal 111 may be formed on a flat surface of the front end of the battery can 116 , and a negative terminal 112 may be formed on a flat, circular rear surface of the rear end of the battery can 116 . In addition, the arrangement of the cylindrical battery cell 100 is not necessarily limited only to this form, and on the contrary, in the cylindrical battery cell 100 , the negative terminal 112 is located at the front end, and the positive terminal 111 is the rear It may be arranged to be positioned at the end.
[60]
However, it is not necessarily limited to this form, and although not shown in the drawings, a positive terminal and a negative terminal may be provided together at the front end of the battery can in another form of a cylindrical battery cell. In this form, the negative terminal may be located at the edge of the front end of the battery can, and the positive terminal may be located at the center of the front end. In addition, the positive terminal and the negative terminal formed on the front end may be insulated by a gasket that is an electrical insulator.
[61]
Furthermore, a plurality of the cylindrical battery cells 100 may be arranged in the left-right direction and the vertical direction. Since the configuration of the cylindrical battery cell 100 is widely known to those skilled in the art at the time of filing the present invention, a more detailed description will be omitted herein.
[62]
On the other hand, the module housing 210 may be provided with an internal space (not shown) that can accommodate the plurality of cylindrical battery cells 100 inserted therein. Specifically, a plurality of hollow structures may be formed in the inner space to surround the outer surface of the cylindrical battery cell 100 . In this case, the module housing 210 may include an electrically insulating material. For example, the electrically insulating material may be a polymer plastic. More specifically, the electrically insulating material may be polyvinyl chloride.
[63]
In addition, the module bus bar 220 may be configured to electrically connect the plurality of cylindrical battery cells 100 . The plurality of module bus bars 220 may be mounted on the front or rear surface of the module housing 210 .
[64]
Specifically, the module bus bar 220 may include a first metal plate 221 and a second metal plate 223 . Specifically, the first metal plate 221 may include a first body portion 221a and a first connection portion 221b. The first body part 221a may be positioned to face the outer surface of the module housing 210 . That is, the main body 221a may be positioned to face the front surface of the module housing 210 . At least a portion of the first body portion 221a may have a shape that is elongated in the left and right directions.
[65]
For example, as shown in FIG. 4 , the first body part 221a may be a part extending in the left and right directions along the outer surface of the module housing 210 . Also, the first connection part 221b may be configured to contact the positive terminal 111 . That is, at least a portion of the first connection portion 221b may be in contact with or welded to the positive terminal 111 to establish an electrical connection with the positive terminal 111 . Also, the second metal plate 233 may be stacked on the first body portion 221a of the first metal plate 221 . For example, as shown in FIG. 4 , the second metal plate 233 may be positioned to be bonded to the front surface of the first body part 221a of the first metal plate 221 . Although not shown in the drawing, in the case of the module bus bar 220 positioned to face the rear surface of the module housing 210 , the second metal plate 233 is the first body of the first metal plate 221 . It may be bonded to the rear surface of the portion 221a.

Claims

[Claim 1]
a plurality of battery cells having electrode terminals formed thereon; a module housing having an internal space configured to accommodate the plurality of battery cells; and a module bus bar configured to electrically connect the plurality of battery cells, wherein the module bus bar includes a first body portion positioned to face an outer surface of the module housing, and a first connection configured to contact the electrode terminal a first metal plate provided with an additional; and a second body portion stacked on the outside of the first body portion of the first metal plate, a second connection portion configured to be in contact with the electrode terminal, and electrically connecting the second connection portion and the second body portion with a predetermined current A battery module comprising a fuse unit configured to be disconnected as described above, and comprising a second metal plate having a thickness smaller than that of the first metal plate.
[Claim 2]
The battery module according to claim 1, wherein the second metal plate includes a reinforcing part formed between the second connection part and the fuse part and formed wider than the width of the fuse part.
[Claim 3]
According to claim 2, wherein the module housing, provided with a connection opening perforated so that the electrode terminal of the battery cell accommodated in the inner space is exposed to the outside, the reinforcement, a portion of the inner side of the module housing through the connection opening Battery module, characterized in that the bent.
[Claim 4]
The battery module according to claim 3, wherein the reinforcing part is joined to at least one of an edge of the connection opening and a periphery of the connection opening.
[Claim 5]
The battery module according to claim 2, wherein the second metal plate includes a reinforcing member configured to surround a connection portion between the fuse unit and the second body unit.
[Claim 6]
According to claim 1, wherein each of the first metal plate and the second metal plate is formed with a fixture punched in the vertical direction, the module housing, the first metal plate and the second metal plate to fix each of the A battery module comprising: a fixing protrusion inserted into the fixture; and a cushion member interposed between the fixture and the fixing protrusion.
[Claim 7]
The battery module according to claim 1, wherein the second metal plate comprises a metal material having a higher specific resistance than the metal material of the first metal plate.
[Claim 8]
The fuse unit of claim 1, wherein the fuse unit is bent at least once based on a direction extending from the second body unit, and the second connection unit is arranged in a direction perpendicular to the bent direction of the fuse unit in a horizontal direction. The battery module, characterized in that at least two or more welding parts welded to the electrode terminal are formed.
[Claim 9]
A battery pack comprising at least one battery module according to any one of claims 1 to 8.
[Claim 10]
An electronic device comprising the battery pack according to claim 9 .