Battery cell and battery pack

Abstract

The utility model relates to battery technology field discloses a kind of battery monomer and battery package, battery monomer includes: electrode assembly and clamping piece;Electrode assembly includes pole piece structure and first tab, and first tab is located in the one side of pole piece structure in first direction;Clamping piece is located in the one side of pole piece structure in first direction, and clamping piece includes first clamping arm and second clamping arm, and first clamping arm and second clamping arm are spaced apart along second direction;First clamping arm, second clamping arm all extend along third direction, and first tab has the root portion of connecting pole piece structure, and first clamping arm, second clamping arm and the root portion of first tab are clamped and cooperate.Tight restriction makes root portion between first clamping arm and second clamping arm, eliminates the space required for the deformation of redundant portion of root portion, cannot freely bend deformation, avoids the root portion redundancy length of first tab being large and causing short circuit problem by partial root portion insertion electrode assembly, improves battery safety.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery cell and battery pack. Background Technology

[0002] Currently, as a key component of new energy vehicles, the performance of power batteries directly affects the range, lifespan, and safety of these vehicles.

[0003] A single battery cell comprises a casing, electrode assemblies, and a cover assembly. The electrode assemblies are manufactured using a winding or stacking method and include positive and negative electrode tabs (collectively referred to as "tabs") for electrically connecting each layer of electrode sheets. The cover assembly has positive and negative electrode posts, and the electrode assemblies are electrically connected to the positive and negative electrode posts via the positive and negative electrode tabs and other metal components. During assembly, the multiple layers of tabs are first folded, gathered, and welded together, then the electrode assemblies are installed into the casing, and finally the cover assembly is pressed in to obtain the single battery cell.

[0004] However, after the tab is folded over, a certain length of redundancy will appear at the root of the tab near the electrode plate. If the redundancy is large and the root of the tab lacks constraint, part of the tab root can easily be inserted into the electrode assembly, causing a short circuit. Utility Model Content

[0005] The technical problem to be solved by this utility model is that after the electrode tab is folded over, the redundant part at the root of the electrode tab is long and the root of the electrode tab lacks restraint, and some of the electrode tab roots are easy to be inserted into the electrode assembly, causing a short circuit problem.

[0006] To solve the above-mentioned technical problems, this utility model provides a technical solution for a single battery cell: A single battery cell has three mutually perpendicular directions: a first direction, a second direction, and a third direction, including: An electrode assembly includes an electrode structure and a first tab, wherein the first tab is disposed on one side of the electrode structure in the first direction; A clamping member is disposed on one side of the electrode structure in the first direction. The clamping member includes a first clamping arm and a second clamping arm, which are arranged at intervals along the second direction. Both the first clamping arm and the second clamping arm extend along the third direction. The first electrode tab has a root portion that connects to the electrode structure, and the first clamping arm and the second clamping arm are clamped together with the root portion of the first electrode tab.

[0007] Furthermore, the clamping member also includes an elastic portion, which connects the first clamping arm and the second clamping arm. The clamping member also has an elastic clamping space, which is located between the first clamping arm and the second clamping arm and is disposed away from the elastic portion.

[0008] Furthermore, a support portion is provided on the side of the first clamping arm away from the second clamping arm, and the support portion extends along the third direction; The first electrode tab also has a connecting portion, which is spaced apart from the electrode structure along the first direction. The root is bent to connect the electrode structure and the connecting portion. The connecting portion is disposed away from the support portion along the first direction and is attached to the support portion.

[0009] Furthermore, the support portion includes a first stop and a second stop distributed at intervals along the first direction. The second stop is disposed close to the electrode structure and supports and cooperates with the electrode structure along the first direction. The first stop supports the connecting portion along the first direction.

[0010] Furthermore, in the third direction, one end of the first clamping arm is movably connected to one end of the second clamping arm, and the other end of the first clamping arm is detachably connected to the other end of the second clamping arm.

[0011] Furthermore, in the third direction, the other end of the first clamping arm is provided with a retaining edge, and the other end of the second clamping arm is provided with a hook, which engages with the retaining edge along the second direction.

[0012] Furthermore, the electrode assembly also includes a second tab, which is connected to one side of the electrode structure in the first direction and is spaced apart from the first tab along the third direction. The clamping element includes a first clamping element and a second clamping element, wherein the first clamping element is clamped to the first electrode tab and the second clamping element is clamped to the second electrode tab.

[0013] Furthermore, the electrode assembly also includes a second tab, which is connected to one side of the electrode structure in the first direction and is spaced apart from the first tab along the third direction; in the third direction, the length of the first clamping arm is L1, the length of the second clamping arm is L2, and the maximum distance between the first tab and the second tab is D, satisfying: L1>D, L2>D.

[0014] Furthermore, the first clamping arm includes a first sidewall arranged close to the second clamping arm along the second direction, the support portion has a third sidewall arranged opposite to it along the first direction, and a first transition portion; the first sidewall and the third sidewall are perpendicular to each other and connected through the first transition portion, the first transition portion being a rounded transition or a chamfered transition; The second clamping arm includes a second sidewall arranged opposite to each other along a second direction, a fourth sidewall arranged opposite to each other along the first direction, and a second transition portion; the second sidewall and the fourth sidewall are perpendicular to each other and connected through the second transition portion.

[0015] Furthermore, the clamping member also includes a first heat-shrinkable part and a second heat-shrinkable part. The first heat-shrinkable part and the second heat-shrinkable part are spaced apart along the third direction and are respectively connected to the first clamping arm and the second clamping arm. The first clamping arm, the first heat-shrinkable part, the second clamping arm and the second heat-shrinkable part form a ring structure.

[0016] To solve the above-mentioned technical problems, this utility model provides a technical solution for a battery pack: The battery pack includes individual battery cells from any of the above-mentioned technical solutions.

[0017] Compared with the prior art, the advantages of this battery cell and battery pack are as follows: the battery cell adopts an electrode assembly and a clamping member design. The electrode assembly includes an electrode structure and a first electrode tab. The first electrode tab is located on one side of the electrode structure in a first direction and has a root connecting to the electrode structure. The clamping member includes a first clamping arm and a second clamping arm arranged at intervals along a second direction. The first clamping arm and the second clamping arm are clamped and engaged with the root of the first electrode tab, thereby limiting and constraining the root of the first electrode tab through the clamping member.

[0018] The first and second clamping arms extend along a third direction, and the clamping components can cover the size range of the root of the first electrode tab along the third direction, providing uniform clamping force. This allows the folding direction of the first electrode tab to be neatly arranged through the clamping components. Moreover, the clamping action tightly restricts the root between the first and second clamping arms, eliminating the space required for deformation of the redundant part of the root, preventing it from bending and deforming freely. This effectively prevents the root of the first electrode tab from bending or inserting into the direction close to the electrode structure, avoiding the problem of short circuit caused by the large redundant length of the root of the first electrode tab inserting part of the root into the electrode assembly, thus improving battery safety. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of a single battery cell according to Embodiment 1 of this utility model; Figure 2 This is a partial schematic diagram of a single battery cell according to Embodiment 1 of this utility model; Figure 3 This is a three-dimensional schematic diagram of the clamping component according to Embodiment 2 of this utility model; Figure 4 This is a side view of the clamping component according to Embodiment 2 of this utility model; Figure 5 This is a three-dimensional schematic diagram of a single battery cell according to Embodiment 3 of this utility model; Figure 6 This is a three-dimensional schematic diagram of the clamping component in Embodiment 3 of this utility model; Figure 7 This is a three-dimensional schematic diagram of the clamping component in embodiment four of this utility model; Figure 8 This is a three-dimensional schematic diagram of a battery cell according to Embodiment 5 of this utility model; Figure 9 This is a three-dimensional schematic diagram of a single battery cell according to Embodiment Six of this utility model; Figure 10 This is a three-dimensional schematic diagram of the clamping component in Embodiment Six of this utility model; In the figure: 1. Electrode assembly; 10. Electrode structure; 11. First tab; 111. Root; 112. Connecting part; 12. Second tab; 2. Clamping member; 2a. First clamping member; 2b. Second clamping member; 21. First clamping arm; 210. Stop; 211. First sidewall; 22. Second clamping arm; 221. Hook; 222. Second sidewall; 223. Fourth sidewall; 224. Second transition part; 23. Support part; 231. First stop edge; 232. Second stop edge; 233. Third sidewall; 234. First transition part; 24. Elastic part; 25. Elastic clamping space; 26. First heat-shrinkable part; 27. Second heat-shrinkable part; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0020] 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.

[0021] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" used to indicate the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0024] like Figure 1 , Figure 2 As shown, a battery cell according to Embodiment 1 of this utility model has a first direction X, a second direction Y and a third direction Z that are perpendicular to each other, and includes: an electrode assembly 1 and a clamping member 2. The electrode assembly 1 includes an electrode structure 10 and a first tab 11. The first tab 11 is disposed on one side of the electrode structure 10 in the first direction X. The clamping member 2 is disposed on one side of the electrode structure 10 in the first direction X. The clamping member 2 includes a first clamping arm 21 and a second clamping arm 22. The first clamping arm 21 and the second clamping arm 22 are arranged at intervals along the second direction Y. The first clamping arm 21 and the second clamping arm 22 both extend along the third direction Z. The first tab 11 has a root 111 that connects to the electrode structure 10, and the first clamping arm 21 and the second clamping arm 22 are clamped and engaged with the root 111 of the first tab 11.

[0025] The battery cell adopts an electrode assembly 1 and a clamping member 2. The electrode assembly 1 includes an electrode structure 10 and a first tab 11. The first tab 11 is located on one side of the electrode structure 10 in the first direction X, and the first tab 11 has a root 111 connected to the electrode structure 10. The clamping member 2 includes a first clamping arm 21 and a second clamping arm 22 arranged at intervals along the second direction Y. The first clamping arm 21 and the second clamping arm 22 are clamped and engaged with the root 111 of the first tab 11, and the clamping member 2 provides a limiting constraint on the root 111 of the first tab 11.

[0026] The first clamping arm 21 and the second clamping arm 22 both extend along the third direction Z. The clamping member 2 can cover the dimension range of the root 111 of the first electrode tab 11 along the third direction Z and provides a uniform clamping force, so that the folding direction of the first electrode tab 11 can be neatly arranged through the clamping member 2. Moreover, the clamping action tightly restricts the root 111 between the first clamping arm 21 and the second clamping arm 22, eliminating the space required for deformation of the redundant part of the root 111, preventing it from bending and deforming freely. This effectively prevents the root 111 of the first electrode tab 11 from bending or inserting into the direction close to the electrode structure 10, avoiding the problem of short circuit caused by the large redundant length of the root 111 of the first electrode tab 11 being inserted into the electrode assembly 1, thus improving battery safety.

[0027] In this embodiment, the clamping member 2 further includes an elastic portion 24, which connects the first clamping arm 21 and the second clamping arm 22. The clamping member 2 also has an elastic clamping space 25, which is located between the first clamping arm 21 and the second clamping arm 22 and is disposed away from the elastic portion 24. The elastic portion 24 enables the first clamping arm 21 and the second clamping arm 22 to form an elastic clamping effect on the root 111 of the first electrode tab 11. During assembly, the elastic clamping space 25 can meet the clamping requirements of different thicknesses of the root 111 of the first electrode tab 11, thereby providing a continuously adaptive clamping force.

[0028] In addition, such as Figure 1 As shown, the electrode assembly 1 also includes a second tab 12, which is connected to one side of the electrode structure 10 in the first direction X and is spaced apart from the first tab 11 in the third direction Z. The clamping member 2 includes a first clamping member 2a and a second clamping member 2b. The first clamping member 2a clamps the first tab 11, and the second clamping member 2b clamps the second tab 12. The clamping member 2 adopts a split structure design. The first clamping member 2a clamps the first tab 11, and the second clamping member 2b clamps the second tab 12, ensuring that the roots 111 of both tabs of the battery cell are reliably confined.

[0029] Embodiment 2 of this utility model, as follows Figure 3 , Figure 4 As shown, based on the above embodiment 1, as a further preferred solution, the first clamping arm 21 has a support portion 23 protruding on the side away from the second clamping arm 22, and the support portion 23 extends along the third direction Z; the first electrode ear 11 also has a connecting portion 112, the connecting portion 112 and the electrode structure 10 are spaced apart along the first direction X, and the root portion 111 is bent to connect the electrode structure 10 and the connecting portion 112; the connecting portion 112 is disposed away from the support portion 23 along the first direction X and is mounted on the support portion 23.

[0030] The support portion 23 of the first clamping arm 21 provides a positioning structure for the connecting portion 112. The working process is as follows: the first electrode ear 11 extends from the electrode structure 10 along the first direction X. The first electrode ear 11 is folded and deformed at the root 111 from 90° to 180°. After folding, the connecting portion 112 of the first electrode ear 11 is placed on the support portion 23. The support portion 23 reliably supports the connecting portion 112 along the first direction X, ensuring that the direction of the first electrode ear 11 after folding is controllable.

[0031] Furthermore, the first clamping arm 21 includes a first sidewall 211 arranged close to the second clamping arm 22 along the second direction Y, and the support portion 23 has a third sidewall 233 arranged opposite to it along the first direction X. The first sidewall 211 and the third sidewall 233 are perpendicular to each other and connected by a first transition portion 234, which is a rounded or chamfered transition. The first transition portion 234 forms a smooth transition between the first sidewall 211 and the third sidewall 233, preventing the first electrode tab 11 from being cut and damaged on the folded side due to the right angle edge between the first sidewall 211 and the third sidewall 233.

[0032] Correspondingly, the second clamping arm 22 includes a second sidewall 222 arranged opposite to each other along the second direction Y, and a fourth sidewall 223 arranged opposite to each other along the first direction X. The second sidewall 222 and the fourth sidewall 223 are perpendicular to each other and connected by a second transition portion 224. Similarly, the second transition portion 224 is a rounded transition or a chamfered transition. The second transition portion 224 can prevent the first electrode tab 11 from being cut and damaged on the other side when folded due to the presence of a right angle edge on the second clamping arm 22.

[0033] Embodiment 3 of this utility model, as follows Figure 5 , Figure 6 As shown, based on the above-described embodiment 2, as a further preferred embodiment, the support portion 23 includes a first baffle 231 and a second baffle 232 spaced apart along the first direction X. The second baffle 232 is disposed close to the electrode structure 10 and supports the electrode structure 10 along the first direction X. The first baffle 231 supports the connecting portion 112 along the first direction X. The support portion 23 adopts a split design of the first baffle 231 and the second baffle 232. The first baffle 231 and the second baffle 232 can provide stable support along the first direction X between the electrode structure 10 and the connecting portion 112, thereby reducing the volume and weight of the support portion 23.

[0034] The fourth embodiment of this utility model differs from the first embodiment in that, in the third direction Z, one end of the first clamping arm 21 is movably connected to one end of the second clamping arm 22, and the other end of the first clamping arm 21 is detachably connected to the other end of the second clamping arm 22. Specifically, as shown... Figure 7As shown, in the third direction Z, the other end of the first clamping arm 21 is provided with a stop 210, and the other end of the second clamping arm 22 is provided with a hook 221. The hook 221 engages with the stop 210 in the second direction Y.

[0035] Compared to the elastic part 24 design in Embodiment 1, the mechanical locking relationship between the hook 221 and the stop 210 avoids unstable clamping effect due to the failure of the elastic part 24. Once the clamping member 2 is engaged, it cannot open on its own, providing an absolutely reliable clamping effect for the first electrode 11. The movable connection can be an openable connection formed by the elastic part 24 at one end of the first clamping arm 21 and one end of the second clamping arm 22. To meet different usage requirements, in other embodiments, the movable connection can also be a hinge, a plastic part, a flexible part, or any other connection method that enables the opening and closing action of the first clamping arm 21 and the second clamping arm 22.

[0036] The fifth embodiment of this utility model differs from the first embodiment described above in that, as follows: Figure 8 As shown, the electrode assembly 1 also includes a second tab 12, which is connected to one side of the electrode structure 10 in the first direction X and is spaced apart from the first tab 11 in the third direction Z. In the third direction Z, the length of the first clamping arm 21 is L1, the length of the second clamping arm 22 is L2, and the maximum distance between the first tab 11 and the second tab 12 is D, satisfying: L1 > D, L2 > D. Because the clamping member 2 adopts an extended design, the root 111 of the first tab 11 and the root of the second tab 12 can be clamped simultaneously by one clamping member 2, reducing the number of components in the battery cell.

[0037] The sixth embodiment of this utility model differs from the first embodiment described above in that, as follows: Figure 9 , Figure 10 As shown, the clamping member 2 also includes a first heat-shrinkable part 26 and a second heat-shrinkable part 27. The first heat-shrinkable part 26 and the second heat-shrinkable part 27 are spaced apart along the third direction Z and are respectively connected to the first clamping arm 21 and the second clamping arm 22. The first clamping arm 21, the first heat-shrinkable part 26, the second clamping arm 22 and the second heat-shrinkable part 27 form a ring structure.

[0038] The clamping component 2 adopts a closed ring structure design, which has a low risk of accidental opening or damage. During assembly, the clamping component 2 is initially in an expanded state. At this time, the first heat-shrinkable part 26 and the second heat-shrinkable part 27 are cooled and lengthened to form a larger space, which allows the first electrode 11 or the second electrode 12 to be inserted smoothly. After assembly, the clamping component 2 is heated, and the first heat-shrinkable part 26 and the second heat-shrinkable part 27 shorten when heated, and effectively clamp the root 111 along the second direction Y. Its structure is simpler and the clamping is more stable after installation.

[0039] This utility model provides a battery pack, which includes battery cells. The specific embodiments of each battery cell are the same as those in the specific embodiments of the battery cells of this utility model, and will not be repeated here.

[0040] 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 having a first direction (X), a second direction (Y), and a third direction (Z) that are mutually perpendicular to each other, characterized in that, include: The electrode assembly (1) includes an electrode structure (10) and a first tab (11), wherein the first tab (11) is disposed on one side of the electrode structure (10) in the first direction (X); A clamping member (2) is disposed on one side of the electrode structure (10) in the first direction (X). The clamping member (2) includes a first clamping arm (21) and a second clamping arm (22), and the first clamping arm (21) and the second clamping arm (22) are arranged at intervals along the second direction (Y). The first clamping arm (21) and the second clamping arm (22) both extend along the third direction (Z). The first electrode tab (11) has a root (111) that connects to the electrode structure (10), and the first clamping arm (21) and the second clamping arm (22) are clamped together with the root (111) of the first electrode tab (11).

2. The battery cell according to claim 1, characterized in that, The clamping member (2) further includes an elastic part (24), which connects the first clamping arm (21) and the second clamping arm (22). The clamping member (2) also has an elastic clamping space (25), which is located between the first clamping arm (21) and the second clamping arm (22) and is disposed away from the elastic part (24).

3. The battery cell according to claim 1, characterized in that, The first clamping arm (21) has a support portion (23) protruding on the side away from the second clamping arm (22), and the support portion (23) extends along the third direction (Z); The first electrode tab (11) also has a connecting portion (112), which is spaced apart from the electrode structure (10) along the first direction (X), and the root portion (111) is bent to connect the electrode structure (10) and the connecting portion (112); the connecting portion (112) is disposed away from the support portion (23) along the first direction (X) and is attached to the support portion (23).

4. The battery cell according to claim 3, characterized in that, The support portion (23) includes a first stop (231) and a second stop (232) spaced apart along the first direction (X). The second stop (232) is disposed close to the electrode structure (10) and supports the electrode structure (10) along the first direction (X). The first stop (231) supports the connecting portion (112) along the first direction (X).

5. The battery cell according to claim 1, characterized in that, On the third direction (Z), one end of the first clamping arm (21) is movably connected to one end of the second clamping arm (22), and the other end of the first clamping arm (21) is detachably connected to the other end of the second clamping arm (22).

6. The battery cell according to claim 5, characterized in that, In the third direction (Z), the other end of the first clamping arm (21) is provided with a stop (210), and the other end of the second clamping arm (22) is provided with a hook (221). Along the second direction (Y), the hook (221) engages with the stop (210).

7. The battery cell according to claim 1, characterized in that, The electrode assembly (1) further includes a second tab (12), which is connected to the electrode structure (10) on one side in the first direction (X) and is spaced apart from the first tab (11) along the third direction (Z). The clamping member (2) includes a first clamping member (2a) and a second clamping member (2b). The first clamping member (2a) is clamped to the first electrode tab (11), and the second clamping member (2b) is clamped to the second electrode tab (12).

8. The battery cell according to claim 1, characterized in that, The electrode assembly (1) further includes a second tab (12), which is connected to the electrode structure (10) on one side of the first direction (X) and is spaced apart from the first tab (11) along the third direction (Z). In the third direction (Z), the length of the first clamping arm (21) is L1, the length of the second clamping arm (22) is L2, and the maximum distance between the first tab (11) and the second tab (12) is D, satisfying: L1 > D, L2 > D.

9. The battery cell according to claim 3, characterized in that, The first clamping arm (21) includes a first sidewall (211) arranged close to the second clamping arm (22) along the second direction (Y), the support (23) has a third sidewall (233) arranged opposite to it along the first direction (X), and a first transition portion (234). The first sidewall (211) is perpendicular to the third sidewall (233) and connected through the first transition portion (234), which is a rounded transition or a chamfered transition; The second clamping arm (22) includes a second sidewall (222) arranged opposite to each other along the second direction (Y), a fourth sidewall (223) arranged opposite to each other along the first direction (X), and a second transition portion (224); the second sidewall (222) is perpendicular to the fourth sidewall (223) and is connected through the second transition portion (224).

10. The battery cell according to claim 1, characterized in that, The clamping member (2) further includes a first heat-shrinkable part (26) and a second heat-shrinkable part (27). The first heat-shrinkable part (26) and the second heat-shrinkable part (27) are spaced apart along the third direction (Z) and are respectively connected to the first clamping arm (21) and the second clamping arm (22). The first clamping arm (21), the first heat-shrinkable part (26), the second clamping arm (22) and the second heat-shrinkable part (27) form a ring structure.

11. A battery pack, characterized in that, Includes the battery cell as described in any one of claims 1 to 10.

Images