A battery module and a battery pack

Abstract

The utility model relates to power battery technical field discloses a kind of battery module and battery pack, the battery module has mutually perpendicular first direction and second direction, including electric core subassembly, first composite double-sided tape and second composite double-sided tape;The electric core subassembly includes multiple electric core units spaced apart in the first direction;The first composite double-sided tape is along the first direction meandering extension and defines multiple compartments, the compartment is used to accommodate the electric core unit, and multiple compartments are arranged along the first direction;The second composite double-sided tape is arranged around the outside of the electric core subassembly;The first composite double-sided tape and the second composite double-sided tape are bonded with the electric core monomer.The utility model has the beneficial effects of: simplifying group structure and process, reducing material types and quantity, reducing production cost, reducing battery module weight, and improving production efficiency.

Description

Technical Field

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

[0002] In existing technologies, two assembly technologies are generally used to assemble battery cells into modules: CTM (Cell to Module) and CTP (Cell to Pack). CTM assembly requires numerous structural components such as end plates, U-shaped frames, side plates, or steel strips, and some connections between these components require welding. This results in a large variety and quantity of materials, complex structure and processes, and high costs. CTP technology, on the other hand, directly integrates the battery cell with the casing, reducing the use of end plates and steel strips. However, the battery cell needs to be fixed by applying structural adhesive, which takes a long time to apply and cure, requires the purchase of adhesive application equipment, and leads to lower production efficiency and higher production costs. Utility Model Content

[0003] The purpose of this utility model is to provide a battery module and battery pack that simplifies the assembly structure and process, reduces the types and quantities of materials, lowers production costs, reduces the weight of the battery module, and improves production efficiency.

[0004] To achieve the above objectives, this utility model provides a battery module having a first direction and a second direction that are perpendicular to each other, including a battery cell assembly, a first composite double-sided tape, and a second composite double-sided tape.

[0005] The battery cell assembly includes a plurality of battery cell units spaced apart in the first direction, and the battery cell unit includes one or more battery cell individuals arranged along the second direction;

[0006] The first composite double-sided tape is disposed inside the battery cell assembly. The first composite double-sided tape extends in a zigzag pattern along the first direction and defines a plurality of cavities. The cavities are used to accommodate the battery cell unit, and the plurality of cavities are arranged along the first direction.

[0007] The second composite double-sided tape is disposed around the outside of the battery cell assembly; both the first composite double-sided tape and the second composite double-sided tape are bonded to the individual battery cells.

[0008] Furthermore, the first composite double-sided tape includes a plurality of first bending segments and a plurality of second bending segments;

[0009] The first bending segment extends in the second direction, and a plurality of the first bending segments are spaced apart in the first direction;

[0010] The second bend extends in the first direction, the second bend connects two adjacent first bends, and the two adjacent second bends are respectively located at both ends of the same first bend along the second direction;

[0011] One second bend segment and two adjacent first bend segments together form a cavity.

[0012] Furthermore, the number of battery cell units is N, and the number of cavities is M, where N = M + 2.

[0013] Furthermore, at least one of the second bent sections is bonded to the side of the cavity away from the second composite double-sided tape.

[0014] Furthermore, an expansion cavity is provided on the first bending section, extending through the first direction, and the expansion cavity is correspondingly provided with the individual battery cell.

[0015] Furthermore, it also includes a third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other; the expansion cavity is rectangular, and the expansion cavity has a first sidewall and a second sidewall spaced apart in the third direction;

[0016] The battery cell has a first end face and a second end face in the third direction, the first sidewall is disposed near the first end face, and the second sidewall is disposed near the second end face;

[0017] The distance from the first sidewall to the first end face is L1, and the distance from the second sidewall to the second end face is L2, where 2mm≤L1≤40mm and 2mm≤L2≤40mm.

[0018] Furthermore, the battery cell has a first side surface, which is the side surface with the largest area in the battery cell, and the first side surface is perpendicular to the first direction;

[0019] The projection of the first side along the first direction onto the adjacent first bend is at least partially located in the expansion cavity.

[0020] Furthermore, the first composite double-sided tape includes an insulating substrate and double-sided adhesive layers located on both sides of the insulating substrate; the double-sided adhesive layers are used to bond with the battery cell.

[0021] Furthermore, the thickness of the insulating substrate is D, where 0.1mm ≤ D ≤ 6mm.

[0022] This utility model also provides a battery pack, including the battery module described in any of the above claims.

[0023] Compared with the prior art, the battery module and battery pack of this utility model embodiment have the following advantages: A first composite double-sided adhesive tape is disposed inside the cell assembly. The first composite double-sided adhesive tape extends in a zigzag manner along a first direction and defines multiple cavities. The multiple cavities are arranged along the first direction, which can separate adjacent cell units in the first direction. At the same time, a second composite double-sided adhesive tape is disposed around the outside of the cell assembly in a third direction. The first composite double-sided adhesive tape and / or the second composite double-sided adhesive tape are bonded to the cell units, which can provide pre-tightening force when the battery module is assembled. Adjacent cell units can be bonded together by the first composite double-sided adhesive tape, and the cell units can be stably connected after assembly by the second composite double-sided adhesive tape. This simplifies the assembly structure, eliminates the need for side plates, U-shaped frames, and other structures, reduces the types and quantities of materials, simplifies the assembly structure and process, makes the battery module easy to assemble, reduces production costs, reduces the weight of the battery module, and improves production efficiency. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the battery module according to the first embodiment of this utility model;

[0025] Figure 2 This is a schematic diagram of the battery module according to the second embodiment of this utility model;

[0026] Figure 3 This is a front view of the battery module according to the first embodiment of this utility model;

[0027] Figure 4 This is a partial cross-sectional view of the first double-sided composite tape of the battery module in this embodiment of the present invention.

[0028] In the figure, 1 is the battery cell assembly; 11 is the battery cell unit; 111 is the battery cell single unit; 1111 is the first end face; 1112 is the second end face; 1113 is the first side face; 2 is the first composite double-sided adhesive tape; 21 is the first bending section; 211 is the expansion cavity; 2111 is the first side wall; 2112 is the second side wall; 22 is the second bending section; 23 is the cavity; 201 is the insulating substrate; 202 is the double-sided adhesive layer; 3 is the second composite double-sided adhesive tape; X is the first direction; Y is the second direction; Z is the third direction. Detailed Implementation

[0029] 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.

[0030] 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.

[0031] 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.

[0032] like Figures 1 to 4 As shown, a preferred embodiment of the present invention provides a battery module having two perpendicular directions X, Y, and Z, and includes a cell assembly 1, a first composite double-sided adhesive tape 2, and a second composite double-sided adhesive tape 3; for ease of explanation, please refer to... Figure 1 Let the thickness direction of cell assembly 1 be defined as the first direction X, the width direction as the second direction Y, and the height direction as the third direction Z. For example... Figure 1 As shown, the battery cell assembly 1 includes a plurality of battery cell units 11 spaced apart in the first direction X. Specifically, the battery cell unit 11 includes one or more battery cell cells 111 arranged along the second direction Y. The number of battery cell units 11 can be adaptively adjusted according to the capacity of the battery module.

[0033] To facilitate the separation and bonding of the battery cell units 11, such as Figure 1 , Figure 2 As shown, the first composite double-sided tape 2 is disposed inside the cell assembly 1. Specifically, the first composite double-sided tape 2 extends in a zigzag pattern along the first direction X and defines multiple cavities 23. The cavities 23 are used to accommodate cell units 11, and the multiple cavities 23 are arranged along the first direction X. The cavities 23 can separate and bond adjacent cell units 11 in the first direction X. The second composite double-sided tape 3 is disposed around the outside of the cell assembly 1. Both the first composite double-sided tape 2 and the second composite double-sided tape 3 are bonded to the individual cell units 111 in the cell unit 11, which can provide pre-tightening force when the battery module is assembled. The first composite double-sided tape 2 can realize the bonding between adjacent cell units 111, and the second composite double-sided tape 3 can realize the stable connection after the cell units 11 are assembled, which simplifies the assembly structure, reduces the types and quantities of materials, simplifies the assembly structure and process, makes the battery module easier to assemble, reduces production costs, reduces the weight of the battery module, and improves production efficiency.

[0034] The second composite double-sided tape 3 can be wrapped around the outside of the cell assembly 1 in a third direction Z.

[0035] Furthermore, in this embodiment, to facilitate the formation of the cavity 23, the first composite double-sided tape 2 includes a plurality of first bending segments 21 and a plurality of second bending segments 22; as shown Figure 1 As shown, the first bending segment 21 extends in the second direction Y, and multiple first bending segments 21 are spaced apart in the first direction X; the second bending segment 22 extends in the first direction X, and the second bending segment 22 connects two adjacent first bending segments 21, and in the same first bending segment 21, two adjacent second bending segments 22 are respectively located at opposite ends of the first bending segment 21 along the second direction Y; one second bending segment 22 and two adjacent first bending segments 21 together form a cavity 23.

[0036] In some embodiments, since the preload required when assembling battery modules of different specifications varies, the quantity of the first composite double-sided adhesive tape 2 can be adjusted accordingly based on the number of individual battery cells 111 in the battery cell unit 11. Figure 1 As shown, the battery cell unit 11 includes a single battery cell 111. In this case, adjacent battery cell units 11 in the second direction Y are bonded together using different first composite double-sided adhesive tapes 2. In other embodiments, such as... Figure 2 As shown, the cell unit 11 includes two individual cell cells 111. In order to reduce the amount of material, all the individual cell cells 111 in the cell unit 11 can be bonded together by a first composite double-sided adhesive tape 2.

[0037] Furthermore, in some embodiments, such as Figure 2 As shown, in order to facilitate the setting of the number of battery cell units 11 corresponding to the cavity 23 of a single first composite double-sided adhesive tape 2, so as to satisfy the separation and bonding between different battery cell units 11 in the second direction Y, the number of battery cell units 11 is N, the number of cavities 23 is M, and N = M + 2.

[0038] Furthermore, the second composite double-sided tape 3 is arranged around the outside of the cell assembly 1 in a third direction Z. At the same time, the second composite double-sided tape 3 is arranged around the first composite double-sided tape 2 in a third direction Z. Therefore, a portion of the second composite double-sided tape 3 is bonded to the first composite double-sided tape 2. Specifically, at least one side of the second bend 22 away from the cavity 23 is bonded to the second composite double-sided tape 3.

[0039] Furthermore, since the individual cell 111 expands due to heat during charging and discharging, in order to reserve sufficient space for thermal expansion, avoid short circuits caused by internal stress accumulation in the individual cell 111, and improve the stability of the battery module, such as... Figure 1 , Figure 2As shown, an expansion cavity 211 is provided on the first bending section 21, which extends through the first direction X. The expansion cavity 211 is correspondingly arranged with the battery cell 111.

[0040] Specifically, in this embodiment, the expansion cavity 211 is rectangular, such as... Figure 2 , Figure 3 As shown, the expansion cavity 211 has a first sidewall 2111 and a second sidewall 2112 spaced apart in the third direction Z; wherein, the battery cell 111 has a first end face 1111 and a second end face 1112 in the third direction Z. In order to facilitate the control of the size of the expansion cavity 211, specifically, the first sidewall 2111 is set close to the first end face 1111, and the second sidewall 2112 is set close to the second end face 1112; the distance from the first sidewall 2111 to the first end face 1111 is L1, and the distance from the second sidewall 2112 to the second end face 1112 is L2, 2mm≤L1≤40mm, 2mm≤L2≤40mm. If L1 < 2mm and L2 < 2mm, the edge dimension of the first composite double-sided tape 2 near the expansion cavity 211 is small, resulting in poor structural stability and easy deformation at this point, which is not conducive to rapid assembly with the battery cell 111. If L1 > 40mm and L2 > 40mm, the opening dimension of the expansion cavity 211 in the third direction Z is small, which cannot meet the expansion requirements of the battery cell 111. Setting L1 and L2 within the range of 2mm to 40mm provides a certain edge width, which is beneficial for bonding with the battery cell and improving structural strength. It also allows sufficient height for the expansion cavity 211 to meet the expansion requirements of the battery cell 111. Preferably, in this embodiment, L1 = 30mm and L2 = 30mm.

[0041] Furthermore, in order to release stress using the expansion cavity 211 when the battery cell 111 expands due to heat, such as... Figure 2 , Figure 3 As shown, the battery cell 111 has a first side surface 1113, wherein the first side surface 1113 is the side surface with the largest area in the battery cell 111, and the first side surface 1113 is perpendicular to the first direction X; the projection of the first side surface 1113 along the first direction X onto the adjacent first bending segment 21 is at least partially located in the expansion cavity 211.

[0042] Furthermore, in order to facilitate the design of the first composite double-sided tape 2 and the second composite double-sided tape 3, and to simplify the structure, the first composite double-sided tape 2 and the second composite double-sided tape 3 have the same structure. Specifically, the first composite double-sided tape 2 includes an insulating substrate 201 and double-sided adhesive layers 202 located on both sides of the insulating substrate 201. The insulating substrate 201 can be made of fiber resin composite material, which has good structural strength and flexibility. The double-sided adhesive layers 202 are used to bond with the battery cell 111. Specifically, in order to ensure that the first composite double-sided adhesive tape 2 has a certain structural strength and reduce the space occupied in the battery module, the thickness of the insulating substrate 201 is D, where 0.1mm≤D≤6mm. When D<0.1mm, the thickness D of the insulating substrate 201 is relatively thin, which is prone to deformation and is not conducive to rapid bonding with the battery cell 111. When D>6mm, the thickness of the insulating substrate 201 is too thick, which requires a large installation space and increases the volume of the battery module. Therefore, in the preferred embodiment, D=1mm.

[0043] This utility model also provides a battery pack, including the battery module of any of the above.

[0044] The assembly process of the battery module of this utility model is as follows: one or more individual battery cells 111 are arranged along the second direction Y to form a battery cell unit 11. The battery cell unit 11 is placed in the cavity 23 of the first composite double-sided adhesive tape 2. The first composite double-sided adhesive tape 2 separates and bonds multiple battery cell units 11 into groups. Then, the second composite double-sided adhesive tape 3 is used to achieve a stable connection of the battery cell units 11 after they are grouped together.

[0045] In summary, this utility model embodiment provides a battery module and battery pack. A first composite double-sided adhesive tape 2 is disposed inside the cell assembly 1. The first composite double-sided adhesive tape 2 extends in a zigzag pattern along the first direction X and defines multiple cavities 23. The multiple cavities 23 are arranged along the first direction X, which can separate adjacent cell units 111 in the first direction X. At the same time, a second composite double-sided adhesive tape 3 is disposed around the outside of the cell assembly 1 in the third direction Z. The first composite double-sided adhesive tape 2 and / or the second composite double-sided adhesive tape 3 are bonded to the cell units 111, which can provide pre-tightening force when the battery module is assembled. The first composite double-sided adhesive tape 2 can realize the bonding between adjacent cell units 111 in groups, and the second composite double-sided adhesive tape 3 can realize the stable connection after the cell units 11 are assembled. This simplifies the assembly structure, reduces the types and quantities of materials, simplifies the assembly structure and process, makes the battery module easy to assemble, reduces production costs, reduces the weight of the battery module, and improves production efficiency.

[0046] 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 module having a first direction (X) and a second direction (Y) that are perpendicular to each other, characterized in that: Includes a battery cell assembly (1), a first composite double-sided tape (2), and a second composite double-sided tape (3); The battery cell assembly (1) includes a plurality of battery cell units (11) spaced apart in the first direction (X), and the battery cell unit (11) includes one or more battery cell individuals (111) arranged along the second direction (Y); The first composite double-sided tape (2) is disposed in the battery cell assembly (1). The first composite double-sided tape (2) extends in a zigzag manner along the first direction (X) and defines a plurality of cavities (23). The cavities (23) are used to accommodate the battery cell unit (11), and the plurality of cavities (23) are arranged along the first direction (X). The second composite double-sided tape (3) is arranged around the outside of the battery cell assembly (1); both the first composite double-sided tape (2) and the second composite double-sided tape (3) are bonded to the battery cell (111).

2. The battery module as described in claim 1, characterized in that: The first composite double-sided tape (2) includes a plurality of first bending segments (21) and a plurality of second bending segments (22); The first bend segment (21) extends in the second direction (Y), and a plurality of the first bend segments (21) are spaced apart in the first direction (X); The second bend segment (22) extends in the first direction (X), the second bend segment (22) connects two adjacent first bend segments (21), and the two adjacent second bend segments (22) are respectively located at both ends of the same first bend segment (21) along the second direction (Y); A second bend segment (22) and two adjacent first bend segments (21) together form a cavity (23).

3. The battery module as described in claim 2, characterized in that: The number of battery cells (11) is N, and the number of cavities (23) is M, where N = M + 2.

4. The battery module as described in claim 2, characterized in that: At least one of the second bends (22) is attached to the side of the cavity (23) away from the second composite double-sided tape (3).

5. The battery module as described in claim 2, characterized in that: An expansion cavity (211) is provided on the first bending section (21) and extends through the first direction (X). The expansion cavity (211) is correspondingly provided with the battery cell (111).

6. The battery module as described in claim 5, characterized in that: It also includes a third direction (Z), wherein the first direction (X), the second direction (Y), and the third direction (Z) are perpendicular to each other; The expansion cavity (211) is rectangular, and the expansion cavity (211) has a first sidewall (2111) and a second sidewall (2112) spaced apart in the third direction (Z); The battery cell (111) has a first end face (1111) and a second end face (1112) in the third direction (Z), the first sidewall (2111) is disposed near the first end face (1111), and the second sidewall (2112) is disposed near the second end face (1112). The distance from the first sidewall (2111) to the first end face (1111) is L1, and the distance from the second sidewall (2112) to the second end face (1112) is L2, where 2mm≤L1≤40mm and 2mm≤L2≤40mm.

7. The battery module as described in claim 5, characterized in that: The battery cell (111) has a first side surface (1113), which is the side surface with the largest area in the battery cell (111), and the first side surface (1113) is perpendicular to the first direction (X); The projection of the first side surface (1113) along the first direction (X) onto the adjacent first bend segment (21) is at least partially located in the expansion cavity (211).

8. The battery module as described in claim 1, characterized in that: The first composite double-sided tape (2) includes an insulating substrate (201) and double-sided adhesive layers (202) located on both sides of the insulating substrate (201); the double-sided adhesive layers (202) are used to bond with the battery cell (111).

9. The battery module as described in claim 8, characterized in that: The thickness of the insulating substrate (201) is D, where 0.1 mm ≤ D ≤ 6 mm.

10. A battery pack, characterized in that: Includes the battery module as described in any one of claims 1-9.

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