A battery pack

Abstract

This utility model relates to the field of battery technology and discloses a battery pack, including at least one first battery cell and at least one second battery cell, and a connecting piece for connecting adjacent first and second battery cells. The first battery cell has a first terminal post, and the second battery cell has a second terminal post. The axial direction of the first terminal post is parallel to the axial direction of the second terminal post. The connecting piece comprises a body, a first connecting portion, and a second connecting portion. The first connecting portion is located at one end of the body in a first direction and is detachably connected to the first terminal post. The second connecting portion is located at the other end of the body in the first direction and is detachably connected to the second terminal post. The advantages of this utility model are: simplified connection structure between battery cells, improved overall battery pack assembly efficiency, easier cell disassembly and assembly, and easier maintenance.

Description

Technical Field

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

[0002] A battery pack typically contains several cells, which are connected in series or parallel via connecting tabs to achieve electrical connections between them. Specifically, the connecting tabs are usually welded to the terminals of the cells to achieve electrical connections between them. The welding process between the connecting tabs and the terminals is relatively complex, reduces the overall assembly efficiency of the battery module, and makes it difficult to disassemble and reassemble the cells within the battery module, which is not conducive to the inspection and maintenance of the battery module. Utility Model Content

[0003] The purpose of this utility model is to provide a battery pack that simplifies the connection structure between battery cells, improves the overall assembly efficiency of the battery pack, facilitates the disassembly and assembly of battery cells, and is convenient for maintenance.

[0004] To achieve the above objectives, this utility model provides a battery pack, including at least one first battery cell and at least one second battery cell, and a connecting piece for connecting adjacent first and second battery cells. The first battery cell has a first terminal post, and the second battery cell has a second terminal post. The axial direction of the first terminal post is parallel to the axial direction of the second terminal post. The connecting piece includes a piece body, a first connecting portion, and a second connecting portion.

[0005] The first connecting part is located at one end of the sheet body in a first direction, and the first connecting part is detachably connected to the first pole post;

[0006] The second connecting part is located at the other end of the sheet body in the first direction, and the second connecting part is detachably connected to the second pole post.

[0007] Furthermore, a first groove is provided on one side of the first connecting part facing the first pole post, and the first groove is sleeved on the end of the first pole post;

[0008] The second connecting part has a second groove on one side facing the second pole post, and the second groove is sleeved on the end of the second pole post.

[0009] Furthermore, a third groove is provided at the end of the first pole post, and a first conductive dielectric layer is provided in the third groove. The end face of the first conductive dielectric layer away from the third groove is in contact with the bottom surface of the first groove.

[0010] The end of the second pole post is provided with a fourth groove, and a second conductive dielectric layer is provided in the fourth groove. The end face of the second conductive dielectric layer away from the fourth groove is in contact with the bottom surface of the second groove.

[0011] Furthermore, a first groove is formed at one end of the first pole post in the second direction, and the second direction intersects the first direction perpendicularly;

[0012] The first connecting part is provided with a first protrusion, which is located in the first sliding groove and can move in the second direction within the first sliding groove;

[0013] The second pole post has a second groove at one end in the second direction, and the second connecting part has a second protrusion. The second protrusion is located in the second groove and can move in the second direction within the second groove.

[0014] Furthermore, it also includes a first nut and a second nut;

[0015] The first nut is threadedly connected to the first pole post. The end of the first nut away from the first pole post is provided with a first annular protrusion. The first connecting part is provided with a first deformation part. The first deformation part is inserted into the first nut and engages with the first annular protrusion.

[0016] The second nut is threadedly connected to the second pole post. The end of the second nut away from the second pole post is provided with a second annular protrusion. The second connecting part is provided with a second deformation part. The second deformation part is inserted into the second nut and engages with the second annular protrusion.

[0017] Furthermore, the end of the first pole post is provided with a first snap-fit ​​portion, the first snap-fit ​​portion including a plurality of first snap-fit ​​blocks spaced apart, the plurality of first snap-fit ​​blocks being arranged around the axis of the first pole post, and the first connecting portion being provided with a plurality of first snap-fit ​​protrusions corresponding to the first snap-fit ​​blocks.

[0018] The end of the second pole post is provided with a second snap-fit ​​portion, the second snap-fit ​​portion includes a plurality of second snap-fit ​​blocks spaced apart, the plurality of second snap-fit ​​blocks are arranged around the axis of the second pole post, and the second connecting portion is provided with a plurality of second snap-fit ​​protrusions corresponding to the second snap-fit ​​blocks.

[0019] Furthermore, the sheet body includes an intermediate section and connecting sections located at both ends of the intermediate section. The thickness of the intermediate section is h, and the thickness of the connecting sections is H, where h < H. The intermediate section is provided with a plurality of through holes at intervals, and the axis of the through holes is parallel to the axis of the first pole post.

[0020] Furthermore, the sheet body is provided with through slots spaced apart in a third direction, and the third direction intersects perpendicularly with the first direction.

[0021] Furthermore, the sheet body has a plurality of heat dissipation protrusions on one side along the thickness direction of the sheet body, and the plurality of heat dissipation protrusions are arranged at intervals in the first direction or the second direction.

[0022] Furthermore, the connecting piece is covered with an insulating layer, and the first connecting portion and the second connecting portion extend beyond the insulating layer.

[0023] Compared with the prior art, the battery pack of this utility model embodiment has the following advantages: the connecting piece includes a piece body, a first connecting part and a second connecting part, wherein the first connecting part is detachably connected to the first terminal post and the second connecting part is detachably connected to the second terminal post. When adjacent cells are electrically connected, there is no need to weld, which simplifies the connection structure between cells, improves the overall assembly efficiency of the battery pack, makes it easy to disassemble and assemble the cells, and facilitates maintenance. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the battery pack structure in Embodiment 1 of this utility model;

[0025] Figure 2 This is a cross-sectional view of the connecting piece of the battery pack in Embodiment 1 of the utility model;

[0026] Figure 3 This is a schematic diagram of the structure of the connecting piece of the battery pack in embodiment 2 of the utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the connecting piece of the battery pack in embodiment 3 of the utility model;

[0028] Figure 5 This is a schematic diagram of the structure of the connecting piece of the battery pack in embodiment 4 of the utility model;

[0029] Figure 6 This is a schematic diagram of the installation of the connecting piece of the battery pack in embodiment 4 of the utility model;

[0030] Figure 7 This is an assembly diagram of the connecting piece of the battery pack in embodiment 5 of the utility model.

[0031] Figure 8 This is a schematic diagram of the structure of the connecting piece of the battery pack in embodiment 5 of the utility model;

[0032] Figure 9 This is an assembly diagram of the connecting piece of the battery pack in embodiment 6 of the utility model;

[0033] Figure 10 yes Figure 9A magnified view of a section at point A in the middle;

[0034] Figure 11 This is a cross-sectional view of the connecting piece of the battery pack in Embodiment 7 of this utility model;

[0035] Figure 12 This is a schematic diagram of the installation of the connecting piece of the battery pack in Embodiment 8 of this utility model;

[0036] Figure 13 This is a front view of the connecting piece of the battery pack in Embodiment 8 of this utility model;

[0037] Figure 14 This is a schematic diagram of the structure of the connecting piece of the battery pack in Embodiment 9 of this utility model;

[0038] Figure 15 This is a cross-sectional view of the connecting piece of the battery pack in Embodiment 9 of this utility model.

[0039] In the diagram, 1 is the first battery cell; 11 is the first terminal post; 111 is the third groove; 112 is the first sliding groove; 113 is the first locking part; and 1131 is the first locking block.

[0040] 2. Second battery cell; 21. Second terminal post; 211. Fourth groove; 212. Second sliding groove; 213. Second locking part; 2131. Second locking block;

[0041] 3. Plate body; 30. Middle section; 31. Connecting section; 32. Through hole; 33. Through slot; 34. Heat dissipation protrusion;

[0042] 4. First connecting part; 41. First groove; 42. First protrusion; 43. First deformable part; 44. First engaging boss;

[0043] 5. Second connecting part; 51. Second groove; 52. Second protrusion; 53. Second deformable part; 54. Second snap-fit ​​boss;

[0044] 6. First conductive dielectric layer; 7. Second conductive dielectric layer; 8. First nut; 81. First annular protrusion; 9. Second nut; 91. Second annular protrusion; 10. Insulating layer; X, first direction; Y, second direction; Z, third direction; a. Connecting piece. Detailed Implementation

[0045] 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.

[0046] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "inner", "outer" and other terms used in this utility model to indicate the orientation or positional relationship are based on the positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device and element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0047] In the description of this utility model, it should be understood that the terms "first," "second," etc., are used to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this utility model, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information.

[0048] like Figures 1 to 15 As shown, a preferred embodiment of the present invention provides a battery pack including at least one first battery cell 1 and at least one second battery cell 2, and a connecting piece a. The connecting piece a is used to connect adjacent first battery cells 1 and second battery cells 2. The first battery cell 1 has a first terminal post 11, and the second battery cell 2 has a second terminal post 21. The axial direction of the first terminal post 11 is parallel to the axial direction of the second terminal post 21. The connecting piece a includes a piece body 3, a first connecting portion 4, and a second connecting portion 5. For ease of explanation, the length direction of the piece body 3 is defined as the first direction X, the width direction as the second direction Y, and the thickness direction as the third direction Z.

[0049] To facilitate the disassembly of the first cell 1 and the second cell 2, a first connecting part 4 is located at one end of the sheet body 3 in the first direction X, and the first connecting part 4 is detachably connected to the first terminal post 11; a second connecting part 5 is located at the other end of the sheet body 3 in the first direction X, and the second connecting part 5 is detachably connected to the second terminal post 21. That is, the first cell 1 and the second cell 2 are detachably connected via connecting piece a. During electrical connection, welding is not required, simplifying the connection structure between the cells, improving the overall assembly efficiency of the battery pack, and facilitating cell disassembly and assembly for maintenance.

[0050] Furthermore, in some embodiments, such as Figure 1 , Figure 2As shown, the first connecting part 4 has a first groove 41 on one side facing the first terminal 11, and the first groove 41 is fitted onto the end of the first terminal 11; the second connecting part 5 has a second groove 51 on one side facing the second terminal 21, and the second groove 51 is fitted onto the end of the second terminal 21. The first terminal 11 contacts the bottom wall and side wall of the first groove 41, and the second terminal 21 contacts the bottom wall and side wall of the second groove 51, which increases the current flow area between the cell and the connecting piece a, reduces the energy consumption of adjacent cells at the connecting piece a, and improves the output efficiency of the battery pack.

[0051] Furthermore, in some embodiments, such as Figure 3 As shown, a third groove 111 is formed at the end of the first electrode post 11, and a first conductive dielectric layer 6 is disposed within the third groove 111. The end face of the first conductive dielectric layer 6 away from the third groove 111 is in contact with the bottom surface of the first groove 41. A fourth groove 211 is formed at the end of the second electrode post 21, and a second conductive dielectric layer 7 is disposed within the fourth groove 211. The end face of the second conductive dielectric layer 7 away from the fourth groove 211 is in contact with the bottom surface of the second groove 51. By setting the conductive dielectric layer, the contact between the electrode post and the connecting piece a is made tighter, improving the stability when adjacent cells are connected. At the same time, the conductive dielectric layer makes the current distribution more uniform when current passes through, preventing local overcurrent, thereby improving the overall current carrying capacity and extending the life of the electrode post and the connecting piece a.

[0052] Furthermore, in some embodiments, such as Figure 4 As shown, the first electrode post 11 has a first groove 112 at one end in the second direction Y, which intersects the first direction X perpendicularly; the first connecting part 4 has a first protrusion 42, which is located in the first groove 112 and can move along the second direction Y within the first groove 112; the second electrode post 21 has a second groove 212 at one end in the second direction Y, and the second connecting part 5 has a second protrusion 52, which is located in the second groove 212 and can move along the second direction Y within the second groove 212. That is, the first protrusion 42 is slidably connected to the first groove 112, and the second protrusion 52 is slidably connected to the second groove 212. When it is necessary to disassemble and repair the first battery cell 1 and the second battery cell 2, the first protrusion 42 can be removed from the first groove 112 and the second protrusion 52 can be removed from the second groove 51 at the same time. When it is necessary to assemble the first battery cell 1 and the second battery cell 2, the first protrusion 42 is moved into the first sliding groove 112 and the second protrusion 52 is moved into the second groove 51 at the same time, so that the first battery cell 1 and the second battery cell 2 can be quickly connected.

[0053] Furthermore, in some other embodiments, such as Figure 5 , Figure 6As shown, to facilitate the assembly and disassembly of the first battery cell 1, the second battery cell 2, and the connecting piece a, a first nut 8 and a second nut 9 are also included. The first nut 8 is threadedly connected to the first terminal post 11. The end of the first nut 8 away from the first terminal post 11 is provided with a first annular protrusion 81. The first connecting part 4 is provided with a first deformation part 43, which is inserted into the first nut 8 and engages with the first annular protrusion 81. The second nut 9 is threadedly connected to the second terminal post 21. The end of the second nut 9 away from the second terminal post 21 is provided with a second annular protrusion 91. The second connecting part 5 is provided with a second deformation part 53, which is inserted into the second nut 9 and engages with the second annular protrusion 91. At this point, the connecting piece a needs to be connected to the first nut 8 and the second nut 9 respectively, and then the first nut 8 is threaded to the first battery cell 1, and the second nut 9 is connected to the second battery cell 2. Specifically, the first deformable part 43 is inserted into the first nut 8 and engaged with the first annular protrusion 81, and the second deformable part 53 is inserted into the second nut 9 and engaged with the second protrusion 52. Then, the first nut 8 on the connecting piece a is threaded to the first pole post 11, and the second nut 9 is threaded to the second pole post 21. When it is necessary to disassemble adjacent battery cells, simply loosen the first nut 8 and the second nut 9 respectively, which is convenient for disassembly and assembly.

[0054] Furthermore, in some embodiments, to facilitate the assembly and disassembly of adjacent cells, reduce the number of parts, and improve the stability of the connection between the connecting piece a and the cell, such as... Figure 12 , 13 As shown, the end of the first electrode post 11 is provided with a first snap-fit ​​portion 113, which includes a plurality of spaced-apart first snap-fit ​​blocks 1131 arranged around the axis of the first electrode post 11. The first connecting portion 4 is provided with a plurality of first snap-fit ​​protrusions 44 corresponding to the first snap-fit ​​blocks 1131. The end of the second electrode post 21 is provided with a second snap-fit ​​portion 213, which includes a plurality of spaced-apart second snap-fit ​​blocks 2131 arranged around the axis of the second electrode post 21. The second connecting portion 5 is provided with a plurality of second snap-fit ​​protrusions 54 corresponding to the second snap-fit ​​blocks 2131. That is, by providing corresponding snap-fit ​​structures for the electrode post and the connecting piece a, it is convenient to disassemble and assemble adjacent battery cells.

[0055] Furthermore, in some embodiments, such as Figure 7 , Figure 8As shown, the sheet body 3 includes a middle section 30 and connecting sections 31 located at both ends of the middle section 30. The thickness of the middle section 30 is h, and the thickness of the connecting section 31 is H, where h < H. Multiple through holes 32 are spaced apart on the middle section 30, and the axis of the through holes 32 is parallel to the axis of the first electrode post 11. The thickness of the middle section 30 is less than the thickness of the connecting section 31, and multiple through holes 32 are spaced apart on the middle section 30. When an external short circuit or internal fault occurs in the battery pack, causing a sudden increase in current, the connecting piece a melts in the middle section 30, cutting off the fault circuit, preventing continuous overcurrent discharge of the battery cell, improving the safety performance of the battery pack, and avoiding the risk of thermal runaway.

[0056] Furthermore, in some embodiments, the sheet body 3 is provided with through slots 33 spaced apart in the third direction Z, which intersects perpendicularly with the first direction X. This can improve the heat dissipation efficiency of the connecting piece a, avoid local overheating of the connecting piece a, and at the same time, since the connecting piece a is provided with through slots 33, the position of the connecting piece a corresponding to the through slot 33 can deform when the vehicle bumps or a collision occurs, buffering the vibration and preventing the rigid vibration of the connecting piece a from being transmitted to the battery cell, thus reducing the risk of terminal breakage.

[0057] Furthermore, in other embodiments, in order to dissipate heat from the connecting piece a, such as... Figure 11 As shown, the sheet body 3 has multiple heat dissipation protrusions 34 on one side along its thickness direction, and these protrusions 34 are spaced apart in the first direction X or the second direction Y. The position and spacing of the heat dissipation protrusions 34 can be adaptively adjusted according to the actual heat dissipation requirements of the connecting sheet a.

[0058] Furthermore, in some other embodiments, such as Figure 14 , Figure 15 The connecting piece a is covered by an insulating layer 10. A first connecting portion 4 extends beyond the insulating layer 10 and connects to the first terminal 11, while a second connecting portion 5 extends beyond the insulating layer 10 and connects to the second terminal 21. The insulating layer 10 prevents the connecting piece a from contacting external conductors, thereby avoiding the risk of short-circuit melting of the connecting piece a or thermal runaway of the battery cell, and improving the overall safety and reliability of the battery pack. Specifically, the insulating layer 10 can be made of materials such as polyimide film or silicone.

[0059] In summary, this utility model embodiment provides a battery pack, wherein the connecting piece a includes a piece body 3, a first connecting part 4, and a second connecting part 5. The first connecting part 4 is detachably connected to the first terminal 11, and the second connecting part 5 is detachably connected to the second terminal 21. When adjacent cells are electrically connected, welding is not required, which simplifies the connection structure between cells, improves the overall assembly efficiency of the battery pack, facilitates the disassembly and assembly of cells, and is conducive to maintenance.

[0060] 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 pack comprising at least one first cell (1) and at least one second cell (2), and a connecting piece (a) for connecting adjacent first cells (1) and second cells (2), wherein the first cell (1) has a first terminal (11), the second cell (2) has a second terminal (21), and the axial direction of the first terminal (11) is parallel to the axial direction of the second terminal (21), characterized in that: The connecting piece (a) includes a piece body (3), a first connecting part (4), and a second connecting part (5); The first connecting part (4) is provided at one end of the sheet body (3) in the first direction (X), and the first connecting part (4) is detachably connected to the first pole post (11); The second connecting part (5) is provided at the other end of the sheet body (3) in the first direction (X), and the second connecting part (5) is detachably connected to the second pole post (21).

2. The battery pack as described in claim 1, characterized in that: The first connecting part (4) has a first groove (41) on one side facing the first pole post (11), and the first groove (41) is sleeved on the end of the first pole post (11); The second connecting part (5) has a second groove (51) on one side facing the second pole post (21), and the second groove (51) is sleeved on the end of the second pole post (21).

3. The battery pack as described in claim 2, characterized in that: The end of the first pole post (11) is provided with a third groove (111), and a first conductive dielectric layer (6) is provided in the third groove (111). The end face of the first conductive dielectric layer (6) away from the third groove (111) is in contact with the bottom surface of the first groove (41). The end of the second pole post (21) is provided with a fourth groove (211), and a second conductive dielectric layer (7) is provided in the fourth groove (211). The end face of the second conductive dielectric layer (7) away from the fourth groove (211) is in contact with the bottom surface of the second groove (51).

4. The battery pack as described in claim 1, characterized in that: The first pole post (11) has a first groove (112) at one end in the second direction (Y), and the second direction (Y) intersects the first direction (X) perpendicularly. The first connecting part (4) is provided with a first protrusion (42), which is located in the first sliding groove (112) and can move in the second direction (Y) within the first sliding groove (112); The second pole post (21) has a second groove (212) at one end in the second direction (Y), and the second connecting part (5) has a second protrusion (52). The second protrusion (52) is located in the second groove (212) and can move in the second direction (Y) within the second groove (212).

5. The battery pack as described in claim 1, characterized in that: It also includes a first nut (8) and a second nut (9); The first nut (8) is threadedly connected to the first pole post (11). The first nut (8) has a first annular protrusion (81) at one end away from the first pole post (11). The first connecting part (4) has a first deformation part (43). The first deformation part (43) is inserted into the first nut (8) and engages with the first annular protrusion (81). The second nut (9) is threadedly connected to the second pole post (21). The second nut (9) has a second annular protrusion (91) at one end away from the second pole post (21). The second connecting part (5) has a second deformation part (53). The second deformation part (53) is inserted into the second nut (9) and engages with the second annular protrusion (91).

6. The battery pack as described in claim 1, characterized in that: The end of the first pole post (11) is provided with a first snap-fit ​​portion (113), the first snap-fit ​​portion (113) includes a plurality of first snap-fit ​​blocks (1131) spaced apart, the plurality of first snap-fit ​​blocks (1131) are arranged around the axis of the first pole post (11), and the first connecting portion (4) is provided with a plurality of first snap-fit ​​protrusions (44) corresponding to the first snap-fit ​​blocks (1131); The end of the second pole post (21) is provided with a second snap-fit ​​portion (213), the second snap-fit ​​portion (213) includes a plurality of second snap-fit ​​blocks (2131) spaced apart, the plurality of second snap-fit ​​blocks (2131) are arranged around the axis of the second pole post (21), and the second connecting portion (5) is provided with a plurality of second snap-fit ​​protrusions (54) corresponding to the second snap-fit ​​blocks (2131).

7. The battery pack as described in claim 1, characterized in that: The sheet body (3) includes an intermediate section (30) and connecting sections (31) located at both ends of the intermediate section (30). The thickness of the intermediate section (30) is h, and the thickness of the connecting section (31) is H, where h < H. The intermediate section (30) is provided with a plurality of through holes (32) at intervals, and the axis of the through holes (32) is parallel to the axis of the first pole post (11).

8. The battery pack as described in claim 1, characterized in that: The sheet body (3) has through slots (33) spaced apart in a third direction (Z), which intersects the first direction (X) perpendicularly.

9. The battery pack as described in claim 1, characterized in that: The sheet (3) has a plurality of heat dissipation protrusions (34) on one side along the thickness direction of the sheet (3), and the plurality of heat dissipation protrusions (34) are arranged at intervals in the first direction (X) or the second direction (Y).

10. The battery pack according to any one of claims 1-9, characterized in that: The connecting piece (a) is covered with an insulating layer (10), and the first connecting part (4) and the second connecting part (5) extend to the outside of the insulating layer (10).

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