Title of invention: battery module
Technical field
[One]
Cross-reference with related application(s)
[2]
This application claims the benefit of priority based on Korean Patent Application No. 10-2018-0156145 filed on December 6, 2018, and all contents disclosed in the documents of the Korean patent application are incorporated as part of this specification.
[3]
The present invention relates to a battery module, and more particularly, to a battery module having a bus bar frame shape for preventing contact.
Background
[4]
Secondary batteries having high ease of application according to product groups and having electrical characteristics such as high energy density have been widely applied to electric vehicles or hybrid vehicles driven by electric drive sources, power storage devices, as well as portable devices. Such a secondary battery is attracting attention as a new energy source for environmentally friendly and energy efficiency improvement in that it does not generate by-products from the use of energy as well as the primary advantage that it can dramatically reduce the use of fossil fuels.
[5]
The battery pack applied to the electric vehicle has a structure in which a plurality of cell assemblies including a plurality of unit cells are connected in series in order to obtain high output. In addition, the unit cell may be repeatedly charged and discharged by an electrochemical reaction between constituent elements including a positive electrode and a negative electrode current collector, a separator, an active material, an electrolyte, and the like.
[6]
Meanwhile, as the need for a large-capacity structure, including use as an energy storage source, is increasing in recent years, there is an increasing demand for a multi-module structure battery pack in which a plurality of secondary batteries are assembled in series and/or parallel .
[7]
On the other hand, when configuring a battery pack by connecting a plurality of battery cells in series/parallel, a battery module consisting of at least one battery cell is first configured, and other components are added using at least one battery module to The way to organize packs is common.
[8]
A conventional battery module includes a plurality of battery cells stacked together and a bus bar assembly electrically connecting electrode leads of the plurality of battery cells. Here, the bus bar assembly includes a bus bar frame having lead slots for individually passing electrode leads of each battery cell and bus bar slots mounted on the bus bar frame and provided to correspond to the number of lead slots. , Comprising a bus bar connected by welding, etc. with electrode leads passing through the bus bar slots.
[9]
However, in the conventional battery module, when the number of cell terraces and battery cells increases, the number of electrode leads increases accordingly, and the shape of the electrode leads and cell terraces becomes compact. I can contact you.
[10]
1 is a view showing a bus bar frame in a conventional battery module. FIG. 2 is an enlarged view of area “A” of FIG. 1. Specifically, FIG. 2A is a cross-sectional view showing the possibility of contact between the electrode lead 40 and the edge of the cell terrace 30, and FIG. 2B is insulated to prevent contact between the electrode lead 40 and the edge of the cell terrace 30. It is a cross-sectional view showing that the tape 60 is attached.
[11]
Referring to FIG. 1, a plurality of battery cells 10 are stacked, and at least one electrode lead 40 protruding from the cell terrace 30 extending from the pouch covering the battery cell 10 meets to form one lead slot. It is passing.
[12]
Referring to FIG. 2A, when the gap between the neighboring cell terraces 30 becomes narrower as the distance from the battery cell 10 increases, the electrode lead 40 and the edge of the cell terrace 30 are closer together. Become, and they can come into contact. When the electrode lead 40 and the edge of the cell terrace 30 contact each other, the cell terrace 30 may exhibit an electric potential, so that the life of the battery cell 10 may be reduced or the pouch may be corroded.
[13]
Referring to FIG. 2B, a separate insulating tape 60 may be attached to prevent contact between the aforementioned electrode lead 40 and the edge of the cell terrace 30. However, the method of attaching the insulating tape 60 incurs additional cost and process, and there is a possibility that contact may still occur if the attaching position is not appropriate. In addition, since the adhesive force of the insulating tape 60 cannot be permanently maintained, there is a possibility that the insulating tape 60 may be separated.
Detailed description of the invention
Technical challenge
[14]
An object to be solved by the present invention is to provide a battery module that prevents electrode leads from touching the edge of a cell terrace adjacent thereto on the outside of a busbar frame.
[15]
However, the problems to be solved by the embodiments of the present invention are not limited to the above-described problems, and may be variously expanded within the scope of the technical idea included in the present invention.
Means of solving the task
[16]
A battery module according to an embodiment of the present invention includes a battery cell stack in which a plurality of battery cells are stacked, a bus bar frame connected to the battery cell stack, and batteries adjacent to each other among battery cells included in the battery cell stack. Cell terraces each protruding from a cell, electrode leads each protruding from the cell terraces, and a partition wall disposed between adjacent electrode leads among the electrode leads and formed on the busbar frame, the The partition wall is an outermost partition wall located between a first cell terrace protruding from an outermost battery cell among battery cells included in the battery cell stack and a second cell terrace protruding from a battery cell immediately adjacent to the outermost battery cell. Includes.
[17]
The outermost partition wall may have a bending structure.
[18]
A plurality of pass guides for separating the electrode leads are formed on the bus bar frame, and the outermost partition wall may be disposed between two pass guides positioned at the outermost side of the bus bar frame.
[19]
The electrode lead may be inserted into a lead slot formed in the busbar frame, and an electrode lead protruding from the first cell terrace and an end portion of the second cell terrace may be kept spaced apart by the outermost partition wall.
[20]
One of the barrier ribs may be disposed between adjacent pass guiders among a plurality of pass guiders formed on the bus bar frame.
[21]
Polarities of the electrode lead protruding from the first cell terrace and the electrode lead protruding from the second cell terrace may be both negative electrodes.
[22]
A distance between the first cell terrace and the second cell terrace from which the electrode leads having the same polarity protrude may be gradually narrowed along a direction in which the electrode leads protrude.
[23]
The bending structure of the outermost partition wall may be bent in a direction in which a gap between the first cell terrace and the second cell terrace is narrowed.
[24]
Electrode leads adjacent to each other with the partition wall interposed therebetween may pass through a lead slot formed in the bus bar frame, and may meet and connect at the rear surface of the bus bar frame.
[25]
Among the battery cells included in the battery cell stack, the bent angle of the partition wall may gradually decrease from the outermost battery cell to the middle battery cell.
[26]
The first cell terrace protruding from the outermost battery cell may have a more curved structure than the second cell terrace protruding from a battery cell immediately adjacent to the outermost battery cell.
[27]
The electrode lead is inserted into a lead slot formed in the bus bar frame, and one of the adjacent ends of the cell terrace and the electrode lead connected to the other end may be kept spaced apart by the partition wall.
[28]
The cell terraces from which the electrode leads having the same polarity protrude may have a narrow spacing along a direction in which the electrode leads protrude.
[29]
A battery pack according to another embodiment of the present invention includes the battery module described above.
[30]
A device according to another embodiment of the present invention includes the battery module described above.
Effects of the Invention
[31]
According to embodiments, a partition wall is formed on the outermost side of the busbar frame so that the electrode lead does not touch the edge of the cell terrace adjacent thereto, thereby implementing a battery module that prevents pouch corrosion and a decrease in cell life.
Brief description of the drawing
[32]
1 is a view showing a bus bar frame in a conventional battery module.
[33]
FIG. 2 is an enlarged view of area “A” of FIG. 1.
[34]
3 is a plan view illustrating a bus bar frame included in a battery module according to an embodiment of the present invention.
[35]
FIG. 4 is an enlarged view showing a connection part between the battery cell stack and the bus bar frame in area "B" of FIG. 3.
[36]
FIG. 5 is an enlarged view showing a connection portion between the battery cell stack and the bus bar frame in a region "C" of FIG.
[37]
6 is a plan view illustrating a battery module including the bus bar frame of FIG. 3.
[38]
7 is a view showing a bus bar frame included in a battery module according to another embodiment of the present invention.
[39]
8 is a plan view showing a connection portion between a battery cell stack and a bus bar frame in a battery module according to another embodiment of the present invention.
Mode for carrying out the invention
[40]
Hereinafter, various embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art may easily implement the present invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.
[41]
In order to clearly describe the present invention, parts irrelevant to the description are omitted, and the same reference numerals are assigned to the same or similar components throughout the specification.
[42]
In addition, the size and thickness of each component shown in the drawings are arbitrarily shown for convenience of description, and the present invention is not necessarily limited to the illustrated bar. In the drawings, the thicknesses are enlarged in order to clearly express various layers and regions. And in the drawings, for convenience of description, the thickness of some layers and regions is exaggerated.
[43]
In addition, throughout the specification, when a certain part "includes" a certain component, it means that other components may be further included rather than excluding other components unless otherwise stated.
[44]
In addition, throughout the specification, the term "on a plane" means when the object portion is viewed from above, and when the object portion is viewed from the top, it means when the object portion is viewed from the side.
[45]
3 is a plan view illustrating a bus bar frame included in a battery module according to an embodiment of the present invention. FIG. 4 is an enlarged view showing a connection part between the battery cell stack and the bus bar frame in area "B" of FIG. 3.
[46]
3 and 4, the bus bar frame 500 included in the battery module according to an embodiment of the present invention includes a pass guide 260, and a plurality of lead slots in the bus bar frame 500 ( 510) is formed. The lead slot 510 may be an opening into which an electrode lead described later is inserted.
[47]
A plurality of pass guiders 260 may be provided. Here, the plurality of pass guides 260 may be provided to correspond to the number of the plurality of lead slots 510. The path guiders 260 located at the outermost sides of both sides of the bus bar frame 500 include a first branch portion 260a and a second branch portion 260b connected to each other, and the bus bar frame 500 and a battery to be described later The y direction, which is a direction in which the cell stack and the bus bar frame 500 are connected, and the first branch portion 260a are parallel. In contrast, the second branch portion 260b has an oblique shape inclined from the y direction to the x direction.
[48]
A partition wall 530 is formed between the adjacent pass guiders 260. At least one partition wall 530 may be formed between the adjacent pass guiders 260, and if a plurality of partition walls 530 are formed in a narrow space, the process may be complicated. Therefore, it is preferable that one partition wall 530 is formed between the pass guiders 260 and two lead electrodes pass through one lead slot 510 with the partition wall 530 interposed therebetween. In this embodiment, the barrier ribs 530 may be disposed one by one between the adjacent pass guiders 260 among the plurality of pass guiders 260 formed on the bus bar frame 500.
[49]
The negative lead 160 may be inserted into the lead slot 510. Since the cathode lead 160 may be formed of copper, it is highly likely to cause corrosion by contacting the cell terrace 135. There may be a plurality of electrode leads 160 inserted into one lead slot 510, and a plurality of electrode leads 160 may be separated and inserted by a partition wall 530 formed in the lead slot 510. After the lead electrodes 160 pass through the lead slot 510, they may be electrically connected together with a bus bar through laser welding. The insertion structure of the electrode lead 160 may be variously modified according to the design change of the series and parallel connection structure of the battery cells.
[50]
FIG. 5 is an enlarged view showing a connection portion between the battery cell stack and the bus bar frame in a region "C" of FIG.
[51]
3 and 5, the battery module according to the present embodiment includes a bus bar frame 500 connected to the battery cell stack 105, the cell terrace 135 protruding from the battery cell 100, and It includes an electrode lead 160 protruding from the cell terrace 135.
[52]
A plurality of pass guides 260 are formed in the bus bar frame 500 to separate the electrode leads 160, and the outermost angle between the two pass guides 260 located at the outermost side of the bus bar frame 500 The partition wall 530p is formed. The outermost partition wall (530p) is a first cell terrace (135a) protruding from the outermost battery cell (100p) among the battery cells (100) included in the battery cell stack (105), and the outermost battery cell (100p). It is located between the second cell terrace (135b) protruding from the immediately adjacent battery cell 100. The outermost partition wall 530p may have a bending structure. The first cell terrace 135a may have a more curved structure than the second cell terrace 135b.
[53]
In the present embodiment, the polarities of the electrode lead 160 protruding from the first cell terrace 135a and the electrode lead 160 protruding from the second cell terrace 135b may be a negative electrode. The gap between the first cell terrace 135a and the second cell terrace 135b from which the electrode leads 160 having the same polarity protrude from each other is gradually narrowed along the direction in which the electrode leads 160 protrude. The bending structure of the outermost partition wall 530p may be bent in a direction in which a gap between the first cell terrace 135a and the second cell terrace 135 becomes narrower.
[54]
6 is a plan view illustrating a battery module including the bus bar frame of FIG. 3. The upper left drawing of FIG. 6 is a top plan view of the structure in which the bus bar frame 500 is mounted on the battery cell stack 105, and the lower left drawing is a front view of the structure, and the right drawing is a part of the front view. It is an enlarged view.
[55]
Accordingly, adjacent electrode leads 160 among the plurality of battery cells 100 are paired with each other, and then the electrode leads 160 pass through the lead slots 510 through each pass guider 260. Thus, a group of electrode leads 160 may be formed. In this case, one electrode lead 160 may be disposed between the pass guider 260 and the partition wall 530. The partition wall 530 has a shape elongated in a direction parallel to the y direction. However, the outermost partition wall 530p may have a bending structure that is bent in a direction in which the gap between the first cell terrace 135a and the second cell terrace 135b becomes narrower.
[56]
The first cell terrace 135a protruding from the outermost battery cell 100p structurally at the outermost portion of the bus bar frame 500 is from the battery cell 100 located in the center of the bus bar frame 500 Compared to the protruding cell terrace 135, the structure is bent when extended from the outermost battery cell 100p. Therefore, the possibility that the electrode lead 160 protruding from the first cell terrace 135a will contact the second cell terrace 135b is increased. When the electrode lead 160 and the second cell terrace 135b come into contact, the pouch case including the cell terrace 135 is corroded, and the cell terrace 135 has an electric potential, thereby reducing the life of the battery cell 10. I can.
[57]
In this regard, according to the present embodiment, the distance between the electrode lead 160 protruding from the first cell terrace 135a and the end portion of the second cell terrace 135b may be maintained by the outermost partition wall 530p . In addition, the separation between one end of the cell terrace 135 adjacent to each other and the electrode lead 160 connected to the other end may be maintained by the partition wall 530. A cell terrace 135 having a narrow gap along the direction in which the electrode leads 160 of each of the plurality of battery cells 100 protrude is formed. The cell terrace 135 may be a portion in which the battery case body is extended.
[58]
Before the pass guider 260 forms the cell terrace 135 so that the electrode leads 160 of each of the two adjacent battery cells 100 extend, the electrode leads 160 are connected to the lead slot 510. As for guiding to pass through, it may be formed on one side of the bus bar frame 500. Specifically, the bus bar frame 500 may include a pass guider 260 inside the rear surface of the bus bar frame 500 located spaced apart from the battery cells 100.
[59]
Such a pass guider 260 is formed of the bus bar frame 500 so that the two electrode leads 160 and the extended portions of the case body 132 including the same before passing through the lead slot 510 are close to each other. A predetermined guide space can be formed at the rear. To this end, the width of the guide space may decrease from the rear (y-axis direction) of the bus bar frame 500 to the front (-y-axis direction) of the bus bar frame 500 having the lead slot 510. have.
[60]
7 is a view showing a bus bar frame included in a battery module according to another embodiment of the present invention.
[61]
Referring to FIG. 7, the bus bar frame included in the battery module according to the present embodiment is the same as the embodiment of FIG. 5 described above, but a hole 650 for mounting the battery module to the device is provided in the bus bar frame 500. Is formed in
[62]
As such, when the hole 650 for mounting the battery module according to the present embodiment to a device such as a vehicle is formed on the outermost side of the bus bar frame 500, a space for forming the hole 650 must be provided. Accordingly, since the outermost battery cell 100p is structurally bent compared to other battery cells 100, the electrode lead 160 protruding from the first cell terrace 135a is separated from the second cell terrace 135b. The likelihood of contact increases. In this structure, the role of the partition wall 530p according to the present embodiment may become more important.
[63]
8 is a plan view showing a connection portion between a battery cell stack and a bus bar frame in a battery module according to another embodiment of the present invention.
[64]
The embodiment to be described in FIG. 8 is substantially the same as the embodiment described in FIGS. 3 to 6, but there are some differences in the shape of the partition wall 530. Hereinafter, a description will be made focusing on differences, and the contents described with reference to FIGS. 3 to 6 except for a part with differences may be applied to the present embodiment.
[65]
Referring to FIG. 8, a bent angle of the partition wall 530 may gradually decrease as the battery cell 100 included in the battery cell stack increases from the outermost battery cell 100p to the middle battery cell 100.
[66]
The battery module described above may be included in the battery pack. The battery pack may have a structure in which one or more battery modules according to the present embodiment are collected and a battery management system (BMS) that manages the temperature or voltage of the battery, and a cooling device are added and packed.
[67]
The battery pack can be applied to various devices. Such a device may be applied to a vehicle such as an electric bicycle, an electric vehicle, or a hybrid vehicle, but the present invention is not limited thereto and is applicable to various devices capable of using a battery module, and this also falls within the scope of the present invention. .
[68]
Although the preferred embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements by those skilled in the art using the basic concept of the present invention defined in the following claims are also present. It belongs to the scope of rights of
[69]
[Explanation of code]
[70]
135: cell terrace 160: electrode lead
[71]
260: pass guider 500: busbar frame
[72]
510: lead slot
Claims
[Claim 1]
A battery cell stack in which a plurality of battery cells are stacked, a bus bar frame connected to the battery cell stack, cell terraces protruding from adjacent battery cells among battery cells included in the battery cell stack, the cell The electrode leads protruding from the terraces, and disposed between the electrode leads adjacent to each other among the electrode leads, and a barrier rib formed on the bus bar frame, the barrier rib included in the battery cell stack. A battery module comprising an outermost partition wall positioned between a first cell terrace protruding from an outermost battery cell among battery cells and a second cell terrace protruding from a battery cell immediately adjacent to the outermost battery cell.
[Claim 2]
The battery module of claim 1, wherein the outermost partition wall has a bending structure.
[Claim 3]
The battery module of claim 1, wherein a plurality of pass guides are formed in the bus bar frame to separate the electrode leads, and the outermost partition wall is disposed between two pass guides located at the outermost side of the bus bar frame. .
[Claim 4]
The method of claim 1, wherein the electrode lead is inserted into a lead slot formed in the bus bar frame, and the electrode lead protruding from the first cell terrace and an end of the second cell terrace are kept spaced apart by the outermost partition wall. Battery module.
[Claim 5]
The battery module of claim 1, wherein the barrier ribs are disposed one by one between adjacent pass guiders among a plurality of pass guiders formed on the bus bar frame.
[Claim 6]
The battery module of claim 1, wherein polarities of the electrode lead protruding from the first cell terrace and the electrode lead protruding from the second cell terrace are negative.
[Claim 7]
The battery module of claim 6, wherein a distance between the first cell terrace and the second cell terrace from which the electrode leads having the same polarity protrude from each other is gradually narrowed along a direction in which the electrode leads protrude.
[Claim 8]
The battery module of claim 7, wherein the bending structure of the outermost partition wall is bent in a direction in which an interval between the first cell terrace and the second cell terrace is narrowed.
[Claim 9]
The battery module of claim 1, wherein electrode leads adjacent to each other with the partition wall interposed therebetween pass through a lead slot formed in the bus bar frame to meet and connect at a rear surface of the bus bar frame.
[Claim 10]
The battery module of claim 1, wherein, among the battery cells included in the battery cell stack, the curved angle of the partition wall gradually decreases from an outermost battery cell to a middle battery cell.
[Claim 11]
The battery module of claim 1, wherein the first cell terrace protruding from the outermost battery cell has a more curved structure than the second cell terrace protruding from a battery cell immediately adjacent to the outermost battery cell.
[Claim 12]
The electrode lead of claim 1, wherein the electrode lead is inserted into a lead slot formed in the bus bar frame, and one of the adjacent ends of the cell terrace and the electrode lead connected to the other end are separated by the partition wall. Battery module maintained.
[Claim 13]
The battery module of claim 1, wherein the cell terraces from which the electrode leads having the same polarity protrude from each other have a narrow spacing along a direction in which the electrode leads protrude.
[Claim 14]
A battery pack comprising the battery module according to claim 1.
[Claim 15]
A device comprising the battery pack according to claim 14.