Battery cell assembly, battery module and battery pack

Abstract

The utility model belongs to the technical field of power batteries, and particularly relates to a battery cell assembly, a battery module and a battery pack. The battery cell assembly comprises a battery cell stack with a fence structure and a plurality of battery cells, the plurality of battery cells are stacked in a fence area defined by the fence structure, and each battery cell is provided with a shell; the insulating part is arranged on the shell and covers at least part of the outer wall of the shell; a fastener; and the pressing strip extends along the stacking direction of the plurality of battery cells and is fixedly connected with the insulating parts on the shells of the plurality of battery cells, and the pressing strip is fixedly connected with the enclosure structure through a fastener. The pressing strips are connected with the insulating parts, so that the battery cells can be connected together, and the overall rigidity of the battery cell stack body is improved; the batten and the enclosure structure are fixedly connected through the fastener, and the enclosure structure plays a role in restraining the battery cell, so that the reliability of connection between the batten and the battery cell stacking body and the rigidity of the whole battery cell stacking structure are improved, and the improvement of the stability and the product quality of the whole structure of the battery cell assembly, the battery module and the battery pack is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model belongs to power battery technical field, especially relate to a kind of battery cell assembly, battery module and battery pack. BACKGROUND

[0002] With the development of battery technology, the application of battery is more and more extensive, and the requirement of battery energy is higher and higher, so multiple battery cells need to be assembled into a group to meet the use demand. In order to ensure the stability of the battery cells after assembly, multiple battery cells need to be connected together. Since the battery cells are easy to touch other parts and cause short circuit during assembly or transportation, an insulating layer is provided on the shell of the battery cell. During assembly, the battery cells can be assembled together by connecting the insulating layer. However, the connection reliability is poor when multiple battery cells are connected and assembled by connecting the insulating layer, and the structural stability of the assembled battery cells is difficult to guarantee. SUMMARY

[0003] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a battery cell assembly, a battery module and a battery pack, to solve the problem of poor structural stability of multiple battery cells in the prior art, and to improve the stability of the overall structure of the battery cell assembly, the battery module and the battery pack.

[0004] To achieve the above-mentioned purpose and other related purposes, the utility model provides a battery cell assembly, comprising:

[0005] A battery cell stack includes a surrounding structure and multiple battery cells. The multiple battery cell stacks are arranged in the surrounding area defined by the surrounding structure. The battery cell has a shell.

[0006] An insulating part is provided on the shell and covers at least part of the outer wall of the shell.

[0007] A fastener;

[0008] A pressing strip extends along the stacking direction of the multiple battery cells in the battery cell stack and is fixedly connected with the insulating part on the shell of the multiple battery cells. The pressing strip is fixedly connected with the surrounding structure by the fastener.

[0009] Optionally, the number of battery cell stacks is multiple, and the same pressing strip is connected with the insulating part on the shell of the battery cells of the adjacent two battery cell stacks and the surrounding structure.

[0010] Optionally, the outer wall of the shell includes a top wall and a side wall, and the insulating part is provided on the top wall and / or the side wall.

[0011] Optionally, the pressing strip comprises a first connecting portion arranged on the top of the two adjacent cell stack bodies, and the first connecting portion is connected and fixed with the insulating member arranged on the top wall.

[0012] Optionally, the pressing strip comprises a second connecting portion arranged between the two adjacent cell stack bodies, and the second connecting portion is connected and fixed with the insulating member arranged on the side wall.

[0013] Optionally, the pressing strip comprises a first connecting portion and a second connecting portion, the first connecting portion is arranged on the top of the two adjacent cell stack bodies and connected and fixed with the insulating member arranged on the top wall, and the second connecting portion is arranged between the two adjacent cell stack bodies and connected and fixed with the insulating member arranged on the side wall.

[0014] Optionally, the cross section of the pressing strip is T-shaped.

[0015] Optionally, the surrounding structure comprises two end plates arranged along the stacking direction of the plurality of cell stack bodies, and the plurality of cells are arranged between the two end plates, and the first connecting portion is connected and fixed with the end plates of the two adjacent cell stack bodies at both ends in the stacking direction of the plurality of cells.

[0016] Optionally, the fastener comprises a bolt, and the two sides of the end portion of the first connecting portion in the extension direction are partially protruded to form a connecting block, the connecting block presses the top wall of the end plate, and the bolt is connected and fixed with the end plate through the connecting block.

[0017] Optionally, the pressing strip and the insulating member are connected and fixed by a glue block.

[0018] To achieve the above object and other related objects, the application further provides a battery module comprising the cell assembly.

[0019] To achieve the above object and other related objects, the application further provides a battery pack comprising the cell assembly.

[0020] As described above, the cell assembly, the battery module and the battery pack have at least the following beneficial effects: the pressing strip is connected with the insulating member arranged on the shell of the cell, so that the plurality of cells can be connected together, which is beneficial to improve the overall rigidity of the cell stack body; based on this, the plurality of cell stack bodies are arranged in the surrounding area, and the pressing strip is further connected and fixed with the surrounding structure by the fastener, the surrounding structure can also constrain the cell, which not only improves the reliability of the connection between the pressing strip and the cell stack body, but also is beneficial to further improve the rigidity of the overall structure of the cell stack, thereby being beneficial to improve the stability of the overall structure of the cell assembly, the battery module and the battery pack and the product quality. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a partial structure schematic view of an embodiment of the battery cell assembly of the utility model;

[0022] Figure 2 It is Figure 1 It is an explosion schematic view of the battery cell assembly;

[0023] Figure 3 It is Figure 1 It is a side view of the battery cell assembly;

[0024] Figure 4 It is Figure 3 It is a sectional view at A-A of the battery cell assembly;

[0025] Figure 5 It is Figure 4 It is an enlarged schematic view of partial B of the battery cell assembly.

[0026] Part number explanation

[0027] Battery cell stack 1, battery cell 11, shell 111, end plate 12, binding belt 2, pressing strip 3, first connecting part 31, second connecting part 32, connecting block 33, insulating piece 4, glue block 5, gap area 6, fastener 7. Specific implementation

[0028] The implementation of the utility model is explained by specific embodiments below, and other advantages and effects of the utility model can be easily understood by those skilled in the art from the content disclosed in the specification.

[0029] It should be understood that the structure, proportion, size, etc. shown in the drawings attached to the specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limiting conditions of the implementation of the utility model, so they do not have technical substantive significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "up", "down", "left", "right", "middle" and "one" in the specification are only for the convenience of clear understanding of the description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of the relative relationship, without substantial change of technical content, is also regarded as the scope of the implementation of the utility model.

[0030] Reference Figures 1 to 5In some optional embodiments, the application provides an electric cell assembly, which comprises an electric cell stack 1, an insulation piece 4, a fastener 7 and a pressing strip 3. In addition to the above components, the electric cell assembly can further comprise a binding belt 2. The electric cell stack 1 comprises an enclosure structure and a plurality of electric cells 11 arranged in a stacked manner in an enclosure area defined by the enclosure structure. The electric cell 11 has a main body and a shell 111, the main body is accommodated inside the shell 111, and the shell 111 comprises an aluminum shell or a steel shell. The aluminum shell has good stability and is not easy to deform. The binding belt 2 is arranged around or wound around the outer periphery of the electric cell stack 1. The binding belt 2 is used to bind the outer periphery of the electric cell stack 1, which is conducive to improving the stability of the assembly of the plurality of electric cells 11 in the same electric cell stack 1. The insulation piece 4 is arranged on the shell 111 and covers at least part of the outer wall of the shell 111, which is conducive to reducing the risk of short circuit of the electric cell 11. The pressing strip 3 extends along the stacking direction of the plurality of electric cells 11 in the electric cell stack 1 and is connected and fixed with the insulation piece 4 on the shell 111 of the plurality of electric cells 11. The connection and fixation of the pressing strip 3 and the insulation piece 4 enable the connection and fixation of the pressing strip 3 and the electric cell 11. The plurality of electric cells 11 can be connected together through the pressing strip 3, which is conducive to improving the stability and rigidity of the overall structure of the electric cell stack 1. In addition, the pressing strip 3 and the enclosure structure are connected and fixed through the fastener 7, which is firm and reliable. The enclosure structure can constrain the electric cell 11 and improve the pressing effect of the pressing strip 3 on the electric cell 11.

[0031] Optionally, the outer wall of the shell 111 comprises a top wall and a side wall. The insulation piece 4 is arranged on the top wall and / or the side wall, that is, the pressing strip 3 is connected and fixed with only the insulation piece 4 arranged on the top wall of the shell 111, or the pressing strip 3 is connected and fixed with only the insulation piece 4 arranged on the side wall of the shell 111, or the pressing strip 3 is connected and fixed with the insulation piece 4 arranged on the top wall and the side wall of the shell 111. Further, the insulation piece 4 comprises a top patch and an insulation film with insulation performance. The top patch is arranged on the top wall of the shell 111, and the insulation film is arranged on the side wall of the shell 111. The top patch and the insulation film have good insulation performance, which is conducive to ensuring the insulation of the shell 111 of the electric cell 11 and reducing the risk of short circuit.

[0032] Optionally, the pressing strip 3 is adhesively fixed with the insulation piece 4. Further, the pressing strip 3 is adhesively fixed with the insulation piece 4 through a glue block 5. The adhesion operation is simple and convenient, and the adhesion strength is high and not easy to separate.

[0033] Optionally, the number of electric cell stacks 1 is multiple. The same pressing strip 3 is connected with the insulation pieces 4 on the shells 111 of the electric cells 11 of the adjacent two electric cell stacks 1 and the enclosure structure, so that the adjacent two electric cell stacks 1 can be relatively fixed to form a whole, which is conducive to improving the rigidity and stability of the overall structure of the electric cell assembly.

[0034] Preferably, the pressing strip 3 is made of a material with high rigidity, strength and toughness. For example, the pressing strip 3 can be made of an alloy material.

[0035] In the above embodiment, the pressing strip 3 is not only connected with the insulating member 4, but also connected with the surrounding structure through the fastener 7, so that the connection is firm and reliable and not easy to fall off, which is conducive to improving the pressing effect of the pressing strip 3 on the battery cell stack 1, thereby enhancing the rigidity and stability of the overall structure of the battery cell stack 1. In addition, the cooperation of the pressing strip 3, the fastener 7 and the surrounding structure improves the performance of the overall structure of the battery cell stack 1, and the structure is more stable, and it is also conducive to reducing the limitation on the type of the insulating member 4, so that the type of the insulating member 4 can be flexibly selected according to the requirement of the insulating performance.

[0036] In some optional embodiments, the pressing strip 3 includes a first connecting portion 31 arranged on the top of the two adjacent battery cell stacks 1, and the first connecting portion 31 is connected and fixed with the insulating member 4 arranged on the top wall. The structure of the pressing strip 3 is simple, and the operation of connecting and fixing the pressing strip 3 with the insulating member 4 on the top wall of the shell 111 is convenient.

[0037] In some optional embodiments, the two adjacent battery cell stacks 1 have a gap area 6 therebetween, and the pressing strip 3 includes a second connecting portion 32 extending into the gap area 6 between the two adjacent battery cell stacks 1, and the second connecting portion 32 is connected and fixed with the insulating member 4 arranged on the side wall. The structure of the pressing strip 3 is simple, and the connection is simple, convenient and reliable. In addition, the second connecting portion 32 extends between the two battery cell stacks 1 to connect the two adjacent battery cell stacks 1, which not only makes full use of the gap area 6 between the two battery cell stacks 1 to improve the space utilization, but also fills the gap area 6, which is conducive to reducing the shaking of the battery cell stack and improving the product quality and safety of the battery cell assembly.

[0038] Referring to Figures 1 to 5 In some optional embodiments, the two adjacent battery cell stacks 1 have a gap area 6 therebetween, and the pressing strip 3 includes a first connecting portion 31 and a second connecting portion 32. The first connecting portion 31 is arranged on the top of the two adjacent battery cell stacks 1 across the gap area 6, and is connected and fixed with the insulating member 4 arranged on the top wall. The second connecting portion 32 extends into the gap area 6 between the two adjacent battery cell stacks 1, and is connected and fixed with the insulating member 4 arranged on the side wall.

[0039] Optionally, the cross section of the pressing strip 3 is T-shaped.

[0040] Optionally, the enclosing structure comprises two end plates 12 arranged along the stacking direction of the plurality of battery cells 11, the plurality of battery cells 11 being clamped between the two end plates 12, the end plates 12 being capable of providing constraint for the battery cells 11, the first connecting part 31 being connected and fixed with the end plates 12 of the two adjacent battery cell stacks 1 at both ends in the stacking direction of the plurality of battery cells 11, the first connecting part 31 being capable of improving the pressing effect of the first connecting part 31 on the insulating piece 4 on the top wall of the shell 111 while being connected with the end plates 12, so that the pressing strip 3 is not easy to be separated from the insulating piece 4, and the rigidity of the overall structure of the battery cell assembly is improved. Further, the fastener 7 comprises a bolt; the two sides of the end portion of the first connecting part 31 in the extension direction are locally protruded to form a connecting block 33, the connecting block 33 presses the top wall of the end plate 12, the bolt is connected and fixed with the end plate 12 through the connecting block 33, and the connecting block 33 is beneficial to increase the contact area of the pressing strip 3 and the end plate 12, so as to provide sufficient connecting and mounting space for the bolt, and the connecting operation is simple and convenient, and the connection is firm and reliable. In the present application, the stacking direction of the plurality of battery cells 11 of the same battery cell stack 1, the extension direction of the pressing strip 3 and the arrangement direction of the two end plates 12 of the same battery cell stack 1 are the same, that is, the Y direction in the drawing; the arrangement direction of the two battery cell stacks 1 connected by the same pressing strip 3 and the distribution direction of the two connecting blocks 33 on the same end of the pressing strip 3 are the same, that is, the X direction in the drawing; the height direction of the battery cell stack 1 and the height direction of the battery cell 11 are the same, that is, the Z direction in the drawing.

[0041] The battery cell assembly of the above embodiment, the first connecting part 31 and the second connecting part 32 cooperate to connect and fix the pressing strip 3 with different parts of the shell 111, increase the contact area, and improve the connection strength of the pressing strip 3 and the shell 111, and at the same time, the pressing strip 3 also realizes the connection and fixation with the adjacent battery cell stacks 1, the structure is stable, the rigidity and stability of the overall structure of the battery cell assembly are improved, and the product quality and safety of the battery cell assembly are improved.

[0042] Referring to Figures 1 to 5 In some optional embodiments, the present application also provides a battery module comprising the battery cell assembly according to any one of the above embodiments.

[0043] Referring to Figures 1 to 5 In some optional embodiments, the present application also provides a battery pack comprising the battery cell assembly according to any one of the above embodiments.

[0044] The electric cell assembly, the battery module and the battery pack of the application, the pressing strip 3 is connected with the insulating piece 4 on the shell 111 of the electric cell 11 at the same time, and is connected and fixed with the surrounding structure capable of providing constraint for the electric cell 11 through the fastener 7, the connection is firm and reliable, the pressing strip 3 is not easy to be separated from the surrounding structure, which is beneficial to improve the pressing connection effect of the pressing strip 3 and the insulating piece 4, and is not easy to be delaminated, thereby being beneficial to improve the stability of the connection between the electric cells 11, improve the rigidity and stability of the overall structure of the electric cell stack 1, and further improve the structural stability and product performance of the electric cell assembly, the battery module and the battery pack.

[0045] In the description of the present specification, the description referring to the terms "the present embodiment", "an example", "a specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are contained in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0046] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. An electrochemical cell assembly, comprising: include: A battery cell stack, the battery cell stack comprising a enclosure structure and a plurality of battery cells, the plurality of battery cells being stacked and arranged within an enclosure area defined by the enclosure structure, the battery cells having a housing; An insulating element disposed on the housing and covering at least a portion of the outer wall of the housing; fastener; A pressure strip extends along the stacking direction of the plurality of battery cells within the battery cell stack and is connected and fixed to the insulating member on the housing of the plurality of battery cells, and the pressure strip is connected and fixed to the enclosure structure by the fasteners.

2. The cell assembly of claim 1, wherein, The number of cell stacks is multiple, and the same pressure strip is connected to the insulating element on the housing of the cell of two adjacent cell stacks and the enclosure structure.

3. The cell assembly of claim 2, wherein, The outer wall of the housing includes a top wall and a side wall, and the insulating element is disposed on the top wall and / or the side wall.

4. The cell assembly of claim 3, wherein, The pressure strip includes a first connecting portion pressed onto the top of two adjacent cell stacks, and the first connecting portion is connected and fixed to the insulating member disposed on the top wall.

5. The cell assembly of claim 3, wherein, The pressure strip includes a second connecting portion extending between two adjacent cell stacks, the second connecting portion being connected and fixed to the insulating member disposed on the side wall.

6. The cell assembly of claim 3, wherein, The pressure strip includes a first connecting part and a second connecting part. The first connecting part is pressed onto the top of two adjacent cell stacks and is connected and fixed to the insulating member disposed on the top wall. The second connecting part extends between two adjacent cell stacks and is connected and fixed to the insulating member disposed on the side wall.

7. The cell assembly of claim 6, wherein, The cross-section of the pressure strip is T-shaped.

8. The cell assembly of claim 4 or 6, wherein, The enclosure structure includes two end plates arranged along the stacking direction of multiple battery cells, with multiple battery cells sandwiched between the two end plates. The first connecting portion is connected and fixed at both ends of the first connecting portion along the stacking direction of the multiple battery cells to the end plates of two adjacent battery cell stacks.

9. The cell assembly of claim 8, wherein, The fastener includes a bolt; the two sides of the end of the first connecting portion along the extension direction partially protrude to form a connecting block, the connecting block pressing against the top wall of the end plate, and the bolt passing through the connecting block and connecting and fixing to the end plate.

10. The cell assembly of claim 1, wherein, The pressure strip is fixed to the insulating component by adhesive blocks.

11. A battery module, characterized by Includes the cell assembly as described in any one of claims 1 to 10.

12. A battery pack, characterized by, Includes the cell assembly as described in any one of claims 1 to 10.

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