Battery cell and battery pack
Patent Information
- Application Number
- CN202521610751.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-30
- Publication Date
- 2026-08-11
- Estimated Expiration
- 2035-07-30
AI Technical Summary
[0004]本实用新型的目的是：提供一种电池单体，以解决现有技术中的锂离子电池的极耳内插或者撕裂而存在安全风险的问题；本实用新型还提供了一种使用该电池单体的电池包
[0021]本实用新型的电池单体及电池包与现有技术相比，其有益效果在于：转接片与下塑胶的其中一个设置定位柱、另一个设置第一定位孔，定位柱沿第一方向穿设在第一定位孔内，定位柱和第一定位孔相互配合，可以对转接片进行定位，保证转接片与极耳的位置稳定，从而防止在合芯及组装时转接片扭转倾斜而导致极耳撕裂，避免电池内部断路；同时在主体部与极耳的弯折部之间夹设支架，支架利用定位柱和第二定位孔定位，避免组装时支架位置变动，同时利用支架对弯折部进行支撑，避免了弯折部内插到主体部内，避免弯折部内插导致电池内部短路，提高了电池单体的安全性。
Smart Images
Figure CN224625754U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of new energy battery technology, and in particular to a battery cell and battery pack. Background Technology
[0002] With the development and application of lithium-ion battery technology, the requirements for the safety and stability of lithium-ion batteries are becoming increasingly stringent. Among these requirements, preventing internal short circuits and open circuits is a major factor determining the safety performance of lithium-ion batteries. A lithium-ion battery mainly consists of a casing, electrode assembly, and cover plate. The electrode assembly has tabs leading out, and the cover plate has terminals. The terminals and tabs are connected by adapter plates.
[0003] After the tabs are led out from the electrode assembly, they need to be bent and welded to the adapter plate. During the bending process, the tabs may insert into the electrode assembly, causing an internal short circuit in the lithium-ion battery. In addition, the adapter plate may be twisted and tilted during the core bonding and assembly of the electrode assembly. When the adapter plate twists, it will pull on the tabs, which may cause the tabs to tear and misalign in severe cases, resulting in an internal open circuit in the lithium-ion battery, causing the performance of the lithium-ion battery to degrade, and in severe cases, it may lead to safety problems in the lithium-ion battery. Utility Model Content
[0004] The purpose of this invention is to provide a battery cell to solve the safety risks associated with the insertion or tearing of the tabs in existing lithium-ion batteries; this invention also provides a battery pack using this battery cell.
[0005] To achieve the above objectives, this utility model provides a battery cell having a first direction and a second direction that are perpendicular to each other, and the battery cell includes:
[0006] An electrode assembly includes a main body and an electrode tab, wherein the electrode tab includes a connecting portion connected to the main body and a bent portion connected to the connecting portion;
[0007] A cover plate, comprising a plate body and a lower plastic piece connected to the plate body;
[0008] The pole is fixedly connected to the plate body;
[0009] The adapter plate electrically connects the electrode post and the electrode tab.
[0010] One of the adapter piece and the lower plastic piece is provided with a positioning post and the other is provided with a first positioning hole. At least two positioning posts and two first positioning holes are provided at intervals along the second direction.
[0011] A bracket is sandwiched between the main body and the bent portion. The bracket has at least two second positioning holes that penetrate the bracket along the first direction. The second positioning holes correspond one-to-one with the first positioning holes and are coaxially arranged along the first direction. The positioning pins are simultaneously inserted into the first positioning holes and the second positioning holes along the first direction.
[0012] In some embodiments, one of the lower plastic and the adapter piece is provided with a positioning block and the other is provided with a positioning groove, and the positioning block is embedded in the positioning groove along the first direction.
[0013] In some embodiments, the positioning groove and the first positioning hole are both provided on the adapter piece, the positioning groove extends along the second direction, and the positioning groove and the first positioning hole are spaced apart along the first direction and the second direction.
[0014] In some embodiments, the positioning block is fitted to the pole post along the second direction.
[0015] In some embodiments, the positioning post is spaced apart from the bent portion along the second direction.
[0016] In some embodiments, the bracket includes a barrier strip extending along the second direction, a second positioning hole being disposed at the end of the barrier strip along the second direction, the barrier strip supporting the bent portion near one end of the connecting portion along a third direction, the third direction being perpendicular to both the first direction and the second direction.
[0017] In some embodiments, the bracket further includes a connecting rod, and at least two barrier strips are spaced apart along the third direction, with the connecting rod connecting each barrier strip along the third direction.
[0018] In some embodiments, the barrier strip has a chamfer near the bend.
[0019] In some embodiments, the barrier strip is one of a wavy shape, a grid shape, or a honeycomb shape.
[0020] This utility model provides another battery pack, including the battery cells described in any of the above technical solutions.
[0021] Compared with the prior art, the battery cell and battery pack of this utility model have the following advantages: One of the adapter piece and the lower plastic part is provided with a positioning post, and the other with a first positioning hole. The positioning post passes through the first positioning hole along a first direction. The positioning post and the first positioning hole cooperate to position the adapter piece, ensuring the stability of the position of the adapter piece and the tab. This prevents the adapter piece from twisting and tilting during core assembly, which could lead to the tab tearing and avoid internal battery circuit breakage. Simultaneously, a bracket is sandwiched between the main body and the bent portion of the tab. The bracket is positioned using the positioning post and the second positioning hole, preventing the bracket's position from changing during assembly. The bracket also supports the bent portion, preventing the bent portion from inserting into the main body and thus avoiding internal battery short circuits, thereby improving the safety of the battery cell. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the structure of a single battery cell of this utility model;
[0023] Figure 2 yes Figure 1 A structural schematic diagram of a single battery cell from another perspective;
[0024] Figure 3 yes Figure 1 A schematic diagram of the structure of the adapter piece for a single battery cell;
[0025] Figure 4 yes Figure 1 A schematic diagram of the support structure for a single battery cell;
[0026] Figure 5 yes Figure 1 A schematic diagram of another embodiment of the support structure for the battery cell;
[0027] Figure 6 yes Figure 1 A schematic diagram of the structure of the cover plate of the battery cell;
[0028] Figure 7 yes Figure 1 A partial cross-sectional view of a single battery cell;
[0029] Figure 8 This is a schematic diagram of another embodiment of the battery cell of this utility model.
[0030] In the figure, 1 is the outer shell, 11 is the receiving cavity, 2 is the electrode assembly, 21 is the main body, 22 is the electrode tab, 221 is the connecting part, 222 is the bending part, 3 is the cover plate, 31 is the plate body, 32 is the lower plastic, 4 is the electrode post, 5 is the adapter piece, 6 is the bracket, 61 is the second positioning hole, 62 is the barrier strip, 63 is the connecting rod, 64 is the chamfer, 7 is the positioning post, 8 is the first positioning hole, 9 is the positioning block, 10 is the positioning groove, Z is the first direction, Y is the second direction, and X is the third direction. Detailed Implementation
[0031] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.
[0032] A preferred embodiment of a battery cell of this utility model is as follows: Figures 1 to 8 As shown, the battery cell includes a housing 1, an electrode assembly 2, a cover plate 3, a terminal post 4, an adapter plate 5, and a bracket 6. The housing 1 has a receiving cavity 11. The electrode assembly 2, the terminal post 4, the adapter plate 5, and the bracket 6 are all disposed in the receiving cavity 11. The cover plate 3 is fixedly connected to the housing 1 and seals the receiving cavity 11.
[0033] The battery cell has a first direction Z and a second direction Y that are perpendicular to each other. In this embodiment, the battery cell is a square battery, and the outer shell 1 and the receiving cavity 11 are both cuboids. The first direction Z is the height direction of the battery cell, and the second direction Y is the width direction of the battery cell.
[0034] like Figure 1 , Figure 2 and Figure 7 As shown, there are two electrode assemblies 2, which are symmetrically arranged in the receiving cavity 11 along the thickness direction of the battery cell. The electrode assembly 2 includes a main body 21 and a tab 22 connected to the main body 21. The tab 22 includes a connecting part 221 and a bending part 222. The connecting part 221 is directly connected to the foil of the main body 21, and the bending part 222 bends toward the main body 21 relative to the connecting part 221. The bending part 222 and the main body 21 are spaced apart along the first direction Z.
[0035] like Figure 1 , Figure 2 and Figure 6 As shown, the cover plate 3 includes a plate body 31 and a lower plastic 32. The lower plastic 32 is fixedly connected to the plate body 31 and is located on the side of the cover plate 3 facing the electrode assembly 2 along the first direction Z. The plate body 31 is fixedly connected to the outer shell 1 and can seal the receiving cavity 11 to protect the internal electrode assembly 2. The lower plastic 32 compresses the electrode assembly 2 along the first direction Z to prevent the electrode assembly 2 from moving within the outer shell 1. Furthermore, the lower plastic 32 can also insulate and isolate the plate body 31 from the electrode assembly 2.
[0036] The pole post 4 is fixedly connected to the plate 31, and the bottom end of the pole post 4 passes through the lower plastic 32. The adapter piece 5 is disposed between the pole post 4 and the tab 22. One end of the adapter piece 5 is welded to the pole post 4 and the other end is welded to the tab 22, so that the tab 22, the adapter piece 5 and the pole post 4 are electrically connected.
[0037] like Figure 1 , Figure 2 and Figure 3 As shown, one of the adapter piece 5 and the lower plastic 32 is provided with a positioning post 7, and the other is provided with a first positioning hole 8. At least two positioning posts 7 and at least two first positioning holes 8 are provided at intervals along the second direction Y. The positioning post 7 passes through the first positioning hole 8 along the first direction Z. After the at least two positioning posts 7 and the positioning holes are assembled, the adapter piece 5 can be positioned at at least two points, can withstand torque, and prevent the adapter piece 5 from moving during the core assembly process, which would cause the tab 22 to tear and avoid the problem of open circuit in the lithium-ion battery.
[0038] like Figure 1 , Figure 2 and Figure 7 As shown, the bracket 6 is clamped between the main body 21 and the bent portion 222 along the first direction Z. The bracket 6 can support the bent portion 222 along the first direction Z, thereby preventing the bent portion 222 of the electrode tab 22 from inserting into the main body 21 of the electrode assembly 2 after the core is assembled, which would cause a short circuit and improve the safety of the battery. After the battery cell is assembled, the bracket 6 is clamped between the main body 21 and the bent portion 222, eliminating the need for assembly with structures such as the lower plastic 32, thus simplifying the assembly method of the bracket 6.
[0039] like Figure 4 , Figure 5 As shown, the bracket 6 is provided with at least two second positioning holes 61. The second positioning holes 61 penetrate the bracket 6 along the first direction Z. The second positioning holes 61, the first positioning holes 8, and the positioning pins 7 are arranged in a one-to-one correspondence. The first positioning holes 8 and the second positioning holes 61 are coaxially arranged along the first direction Z. The positioning pins 7 are inserted into the second positioning holes 61 along the first direction Z. That is, the positioning pins 7 are inserted into both the first positioning holes 8 and the second positioning holes 61 along the first direction Z. After the positioning pins 7 are assembled with the second positioning holes 61, the position of the bracket 6 can be positioned to prevent the bracket 6 from moving during the assembly process.
[0040] In this embodiment, there are four positioning posts 7, four first positioning holes 8, and four second positioning holes 61, which are distributed in a rectangular interval. Increasing the number of positioning posts 7, four first positioning holes 8, and four second positioning holes 61 can increase the assembly accuracy of the adapter piece 5.
[0041] In some embodiments, such as Figure 1 , Figure 2 and Figure 6 As shown, the positioning post 7 is fixedly connected to the lower plastic 32, and the first positioning hole 8 passes through the adapter piece 5 along the first direction Z. At this time, the positioning post 7 extends along the first direction Z. When assembling the battery body, the positioning post 7 passes through the first positioning hole 8 on the adapter piece 5 and the second positioning hole 61 on the bracket 6 in sequence along the first direction Z.
[0042] In some embodiments, such as Figure 8As shown, the positioning post 7 is set on the adapter piece 5, the first positioning hole 8 is set on the lower plastic 32, the middle part of the positioning post 7 is fixedly connected to the adapter piece 5, and the two ends of the positioning post 7 are located on both sides of the adapter piece 5. When assembling the battery body, one end of the positioning post 7 passes through the first positioning hole 8 on the lower plastic 32, and the other end passes through the second positioning hole 61 on the bracket 6.
[0043] The adapter piece 5 of the battery cell and the lower plastic 32 are provided with a positioning post 7 on one side and a first positioning hole 8 on the other side. The positioning post 7 passes through the first positioning hole 8 along the first direction Z. The positioning post 7 and the first positioning hole 8 cooperate with each other to position the adapter piece 5, ensuring the stability of the position of the adapter piece 5 and the tab 22. This prevents the adapter piece 5 from twisting and tilting during core assembly, which could cause the tab 22 to tear and avoid internal circuit breakage in the battery. At the same time, a bracket 6 is sandwiched between the main body 21 and the bent portion 222 of the tab 22. The bracket 6 is positioned by the positioning post 7 and the second positioning hole 61 to prevent the position of the bracket 6 from changing during assembly. The bracket 6 also supports the bent portion 222, preventing the bent portion 222 from inserting into the main body 21 and causing an internal short circuit in the battery, thus improving the safety of the battery cell.
[0044] In some embodiments, one of the lower plastic 32 and the adapter piece 5 is provided with a positioning block 9 and the other is provided with a positioning groove 10, and the positioning block 9 is embedded in the positioning groove 10 along the first direction Z.
[0045] like Figure 3 and Figure 6 As shown, the positioning block 9 is embedded in the positioning groove 10 along the first direction Z. After the positioning block 9 and the positioning groove 10 are assembled, the adapter piece 5 can be repositioned, increasing the positioning accuracy of the adapter piece 5 and preventing the adapter piece 5 from twisting or tilting. After the first positioning hole 8 and the positioning post 7 are assembled, since the positioning post 7 needs to pass through the first positioning hole 8, there is a gap between the first positioning hole 8 and the positioning post 7, which causes the adapter piece 5 to undergo a slight positional change. By repositioning the adapter piece 5 with the positioning block 9 and the positioning groove 10, misalignment of the adapter piece 5 can be avoided.
[0046] When the positioning block 9 is set on the adapter piece 5 and the positioning groove 10 is set on the lower plastic 32, the positioning groove 10 does not penetrate the lower plastic 32; when the positioning groove 10 is set on the adapter piece 5 and the positioning block 9 is set on the lower plastic 32, the positioning groove 10 can penetrate the adapter piece 5 along the first direction Z, which can simplify the molding process of the positioning groove 10. Alternatively, the positioning groove 10 can not penetrate the adapter piece 5, which can increase the flow area of the adapter piece 5.
[0047] In some embodiments, the positioning groove 10 and the first positioning hole 8 are both provided on the adapter piece 5. The positioning groove 10 extends along the second direction Y and is spaced apart along the first direction Z and the second direction Y.
[0048] The positioning groove 10 and the first positioning hole 8 are both provided on the adapter piece 5. The first positioning hole 8 and the positioning groove 10 can be formed using the same process, which simplifies the manufacturing process of the adapter piece 5 and reduces costs. In this embodiment, the positioning groove 10 is a rectangular groove extending along the second direction Y, which can increase the contact area between the positioning block 9 and the positioning groove 10 and increase the assembly accuracy of the adapter piece 5. The positioning groove 10 and the first positioning hole 8 are spaced apart along the first direction Z and the second direction Y. When the adapter piece 5 has a tendency to twist and tilt, the positioning block 9 and the positioning post 7 apply force to the adapter piece 5 at different positions, generating torque to eliminate the tendency of the adapter piece 5 to twist and tilt.
[0049] In some embodiments, the positioning block 9 is fitted to the pole post 4 along the second direction Y.
[0050] like Figure 6 As shown, the positioning block 9 is fitted to the pole post 4. Since the pole post 4 is welded and fixed to the adapter piece 5, the position of the positioning block 9 and the positioning groove 10 can be determined with the pole post 4 as a reference, which is convenient for processing.
[0051] In some embodiments, the positioning post 7 and the bent portion 222 are spaced apart along the second direction Y.
[0052] like Figure 7 As shown, there is a gap between the positioning post 7 and the bent portion 222 of the electrode tab 22, which can prevent the positioning post 7 and the electrode tab 22 from interfering and causing the electrode tab 22 to tear.
[0053] In some embodiments, the bracket 6 includes a barrier strip 62 extending along the second direction Y, and a second positioning hole 61 is provided at the end of the barrier strip 62 along the second direction Y. The barrier strip 62 supports the bent portion 222 at one end of the third direction X near the connecting portion 221, and the third direction X is perpendicular to both the first direction Z and the second direction Y.
[0054] like Figure 4 As shown, the end of the bent portion 222 near the connecting portion 221 along the third direction X is a high-risk area where the tab 22 is inserted into the main body 21 of the electrode assembly 2. The barrier strip 62 supports this high-risk area, which can prevent the tab 22 from being inserted into the main body 21 of the electrode assembly 2 and reduce the risk of battery short circuit. In this embodiment, the third direction X is the thickness direction of the battery body.
[0055] In some embodiments, the bracket 6 further includes a connecting rod 63, and at least two barrier strips 62 are spaced apart along the third direction X, with the connecting rod 63 connecting each barrier strip 62 along the third direction X.
[0056] like Figure 5As shown, the barrier strips 62 spaced apart along the third direction X and the connecting rods 63 form the entire support 6. The barrier strips 62 form a whole, increasing the overall strength of the support 6 and improving the stability of the support for the tab 22. In this embodiment, the connecting rod 63 and the bent portion 222 are arranged opposite each other along the first direction Z. The connecting rod 63 can support the end of the bent portion 222 away from the connecting portion 221, further avoiding the risk of short circuit caused by the tab 22 inserting into the main body 21.
[0057] In some embodiments, the barrier strip 62 has a chamfer 64 near the bend 222.
[0058] When the barrier strip 62 supports the bent portion 222, the chamfer 64 can prevent damage to the tab 22.
[0059] In some embodiments, the barrier strip 62 is one of a wavy shape, a grid shape, or a honeycomb shape.
[0060] The wave-shaped, grid-shaped, or honeycomb-shaped barrier strip 62 can absorb stress and, to a certain extent, withstand the force along the first direction Z that the electrode assembly 2 experiences on the tab 22 before the core is closed.
[0061] This utility model also provides a battery pack, including a battery cell. The specific structure of the battery cell is the same as that of the battery cell described in any of the above embodiments, and will not be repeated here.
[0062] In summary, this utility model embodiment provides a battery cell and a battery pack. One of the adapter pieces and the lower plastic piece is provided with a positioning post, and the other with a first positioning hole. The positioning post passes through the first positioning hole along a first direction. The positioning post and the first positioning hole cooperate to position the adapter piece, ensuring the stability of the adapter piece and the tab's position. This prevents the adapter piece from twisting or tilting during core assembly, which could lead to the tab tearing and avoid internal battery circuit breakage. Simultaneously, a bracket is sandwiched between the main body and the bent portion of the tab. The bracket is positioned using the positioning post and the second positioning hole, preventing the bracket's position from changing during assembly. The bracket also supports the bent portion, preventing it from inserting into the main body and causing an internal battery short circuit, thus improving the safety of the battery cell.
[0063] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.
Claims
1. A battery cell, characterized by, The battery cell has a first direction and a second direction that are perpendicular to each other. The battery cell includes: An electrode assembly includes a main body and an electrode tab, wherein the electrode tab includes a connecting portion connected to the main body and a bent portion connected to the connecting portion; A cover plate, comprising a plate body and a lower plastic piece connected to the plate body; The pole is fixedly connected to the plate body; The adapter plate electrically connects the electrode post and the electrode tab. One of the adapter piece and the lower plastic piece is provided with a positioning post and the other is provided with a first positioning hole. At least two positioning posts and two first positioning holes are provided at intervals along the second direction. A bracket is sandwiched between the main body and the bent portion. The bracket has at least two second positioning holes that penetrate the bracket along the first direction. The second positioning holes correspond one-to-one with the first positioning holes and are coaxially arranged along the first direction. The positioning pins are simultaneously inserted into the first positioning holes and the second positioning holes along the first direction.
2. The battery cell of claim 1, wherein, One of the lower plastic and the adapter piece is provided with a positioning block and the other is provided with a positioning groove. The positioning block is embedded in the positioning groove along the first direction.
3. The battery cell of claim 2, wherein, Both the positioning groove and the first positioning hole are provided on the adapter piece. The positioning groove extends along the second direction. Along the first direction and the second direction, the positioning groove and the first positioning hole are spaced apart.
4. The battery cell according to claim 3, characterized in that, Along the second direction, the positioning block is fitted to the pole post.
5. The battery cell according to any one of claims 1-4, characterized in that, Along the second direction, the positioning post and the bent portion are spaced apart.
6. The battery cell according to any one of claims 1-4, characterized in that, The bracket includes a barrier strip extending along the second direction, and a second positioning hole is provided at the end of the barrier strip along the second direction. The barrier strip supports the bent portion near the end of the connecting portion along a third direction, and the third direction is perpendicular to both the first direction and the second direction.
7. The battery cell according to claim 6, characterized in that, The bracket also includes a connecting rod, and at least two barrier strips are spaced apart along the third direction, with the connecting rod connecting each barrier strip along the third direction.
8. The battery cell according to claim 6, characterized in that, The barrier strip has a chamfer near the bend.
9. The battery cell according to claim 6, characterized in that, The barrier strip is one of the following: wavy, grid, or honeycomb.
10. A battery pack, characterized in that, Includes the battery cell described in any one of claims 1-9.