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 stacking body which comprises a plurality of stacked battery cells, and each battery cell is provided with a shell; the insulating part is arranged on the shell and covers the outer wall of the shell, an opening is formed in the insulating part, and part of the outer wall of the shell corresponds to the opening to be exposed to form a connecting area; and the pressing strip extends along the stacking direction of the plurality of battery cells and is fixedly connected with the insulating parts corresponding to the plurality of battery cells, and the pressing strip covers the connecting area and is fixedly connected with the connecting area. The pressing strip is directly connected and fixed with the connecting area and is not easy to separate from the battery cell, and the pressing strip is connected and fixed with the insulating part, so that the connecting contact area of the pressing strip is increased, and the connecting stability of the pressing strip and the battery cell is improved; and the pressing strip is connected with the plurality of battery cells, so that the structural rigidity and stability of the battery cell stacking body can be improved, and the structural stability and product performance of the battery cell assembly, the battery module and the battery pack can be improved.

Description

Technical Field

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

[0002] With the development of battery technology, battery applications are becoming increasingly widespread, and the energy requirements for batteries are also increasing. This necessitates assembling multiple battery cells into groups to meet these demands. To ensure the stability of the assembled cells, multiple cells need to be connected together. Because battery cells are prone to short circuits due to contact with other components during assembly or transportation, an insulating layer is installed on the cell casing. During assembly, cells can be joined together by connecting the insulating layer. However, connecting multiple cells via the insulating layer presents a problem of poor connection reliability, making it difficult to guarantee the structural stability of the assembled cells. Utility Model Content

[0003] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a cell assembly, battery module and battery pack to solve the problem of poor structural stability of multiple cell assemblies in the prior art, so as to improve the overall structural stability of the cell assembly, battery module and battery pack.

[0004] To achieve the above and other related objectives, this utility model provides a battery cell assembly, comprising:

[0005] A battery cell stack comprising a plurality of stacked battery cells, each battery cell having a housing;

[0006] An insulating element is disposed on the housing and covers the outer wall of the housing. The insulating element has an opening, and a portion of the outer wall of the housing is exposed to form a connection area.

[0007] A pressure strip extends along the stacking direction of the plurality of battery cells and is connected and fixed to the insulating member corresponding to the plurality of battery cells, and the pressure strip covers the connection area and is connected and fixed to the connection area.

[0008] Optionally, the outer wall of the housing includes a top wall and a side wall, and the pressure strip is bonded and fixed to a portion of the insulating element located on the top wall and / or a portion of the insulating element located on the side wall.

[0009] Optionally, a portion of the sidewall is formed as the connecting area, and the pressure strip is bonded and fixed to the connecting area.

[0010] Optionally, there are multiple battery cell stacks, with a gap between two adjacent battery cell stacks, and they are connected and fixed by the pressure strip. The pressure strip is bonded and fixed to the battery cell stack by adhesive blocks.

[0011] Optionally, the pressing strip comprises a first connecting portion and a second connecting portion, the first connecting portion spans the gap region and is fixedly bonded to the insulating member on the top wall via the adhesive block; the second connecting portion extends into the gap region and is fixedly bonded to the connecting region on the side wall via the adhesive block.

[0012] Optionally, a glue blocking member is arranged in the gap region to limit overflow of the adhesive block.

[0013] Optionally, the battery cell assembly further comprises a binding belt, the binding belt is arranged around the side of the battery cell stack, and the glue blocking member is clamped between the sides of two adjacent battery cell stacks.

[0014] Optionally, the glue blocking member is supported on the binding belt.

[0015] Optionally, the battery cell assembly further comprises a binding belt, the binding belt is arranged around the side of the battery cell stack, and the glue blocking member is clamped between the binding belts on two adjacent battery cell stacks and cooperates with the binding belts to limit overflow of the adhesive block.

[0016] Optionally, the insulating member comprises an insulating sheet and / or an insulating film.

[0017] Optionally, an insulating coating is arranged on the connecting region, and the pressing strip is fixedly bonded to the insulating coating.

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

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

[0020] As described above, the battery cell assembly, the battery module and the battery pack of the present application have at least the following beneficial effects: the pressing strip is fixedly connected to the connecting region, so that the pressing strip is directly fixedly connected to the shell of the battery cell, the connection is firm and the pressing strip is not easy to be separated from the battery cell; the pressing strip covers the connecting region and is fixedly connected to the insulating member fixed on the shell of the battery cell, which on one hand increases the connecting contact area of the pressing strip and is conducive to further improving the stability of the connection between the pressing strip and the battery cell, and on the other hand the pressing strip covers the entire connecting region when connected to the insulating member, which is conducive to ensuring the insulation performance of the battery cell; based on this, the pressing strip is connected to multiple battery cells, and the multiple battery cells are connected together, which is conducive to improving the structural rigidity and stability of the battery cell stack, thereby being conducive to improving the structural stability and product performance of the battery cell assembly, the battery module and the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1Part structure schematic view of the battery cell assembly embodiment one of the utility model;

[0022] Figure 2 For Figure 1 The explosion schematic view of the battery cell assembly;

[0023] Figure 3 For Figure 1 The plan view of the battery cell assembly;

[0024] Figure 4 For Figure 3 The sectional view of A-A in the battery cell assembly;

[0025] Figure 5 For Figure 4 The enlarged schematic view of part B in the battery cell assembly;

[0026] Figure 6 For Figure 1 The structure schematic view of the battery cell;

[0027] Figure 7 Part structure explosion schematic view of the battery cell assembly embodiment two of the utility model;

[0028] Figure 8 The sectional view of the battery cell assembly embodiment two of the utility model;

[0029] Figure 9 For Figure 8 The enlarged schematic view of part C in the battery cell assembly.

[0030] Part number explanation

[0031] Battery cell stack 1, battery cell 11, shell 111, connecting area 112, fixed plate 12, binding belt 2, pressing strip 3, first connecting part 31, second connecting part 32, insulating piece 4, glue block 5, gap area 6, glue blocking piece 7. Specific implementation

[0032] The implementation of the utility model is explained by specific 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.

[0033] It is to be understood that the structures, proportions, sizes, etc. shown in the drawings accompanying the present specification are merely intended to facilitate the understanding of the content disclosed in the present specification for those skilled in the art to understand and read, and are not intended to limit the implementation of the present application, and therefore do not have substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are merely for the convenience of clear description, and are not intended to limit the scope of the present application, and the change or adjustment of the relative relationship without substantially changing the technical content is also considered as the scope of the present application.

[0034] Referring to Figures 1 to 9 In some optional embodiments, the present application provides an electric core assembly, which comprises an electric core stack 1, an insulating piece 4 and a pressing strip 3; in addition to the above-mentioned components, the electric core assembly can also comprise a binding belt 2. The electric core stack 1 comprises a plurality of electric cores 11 arranged in a stack, the electric core 11 has a main body part and a shell 111, the main body part is accommodated inside the shell 111, 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 the side of the electric core stack 1, that is, the binding belt 2 can be wound around the outer periphery of the electric core stack 1, and the binding of the outer periphery of the electric core stack 1 by the binding belt 2 is conducive to improving the stability of the assembly of the plurality of electric cores 11 in the same electric core stack 1. The insulating piece 4 is arranged on the shell 111 and covers the outer wall of the shell 111, the insulating piece 4 is provided with an opening, and part of the outer wall of the shell 111 corresponds to the opening to expose the connection area 112; the pressing strip 3 extends along the stacking direction of the plurality of electric cores 11 and is connected and fixed with the insulating piece 4 corresponding to the plurality of electric cores 11, and the pressing strip 3 covers and is connected and fixed with the connection area 112, the pressing strip 3 is connected and fixed with the connection area 112 and the insulating piece 4 at the same time, the connection is firm and not easy to be separated.

[0035] Optionally, the pressing strip 3 is adhesively fixed with the insulating piece 4. Further, the outer wall of the shell 111 comprises a top wall and a side wall, and the pressing strip 3 is adhesively fixed with the insulating piece 4 in the top wall and / or in the side wall. Specifically, the pressing strip 3 is adhesively fixed with the insulating piece 4 through a glue block 5 or other adhesive medium, the connection operation is simple and convenient, and the connection is reliable. Among them, the insulating piece 4 comprises an insulating sheet and / or an insulating film, in the present embodiment, the part of the insulating piece 4 covering the top wall is an insulating sheet, and the part of the insulating piece 4 covering the side wall is an insulating film.

[0036] Optionally, part of the side wall of the shell 111 is formed as a connecting area 112, and the pressing strip 3 is adhesively fixed to the connecting area 112, with high adhesive strength, which is conducive to avoiding disengagement; wherein the connecting area 112 is located at a region of the side wall close to the top wall, so that the pressing strip 3 is simultaneously connected and fixed to the top wall and the side wall. Further, the pressing strip 3 is adhesively fixed to the connecting area 112 by the glue block 5 or other adhesive medium, and the connection operation is simple and convenient, and the connection is reliable.

[0037] Optionally, the connecting area 112 is provided with an insulating coating, and the pressing strip 3 is adhesively fixed to the insulating coating by the glue block or other adhesive medium. The insulating coating can be sprayed on the connecting area 112 of the shell 111, and the insulating coating is formed by spraying paint on the connecting area 112, has the characteristics of paint, and has stable structure and is not easy to separate from the shell 111, especially compared with the insulating film and the insulating sheet, even under stress, it is not easy to be overturned and separated from the shell 111, and the pressing strip 3 is connected and fixed to the insulating coating, which is conducive to ensuring the insulation performance of the battery cell 11 while also making the pressing strip 3 not easy to separate from the battery cell 11.

[0038] Optionally, the battery cell stack 1 further comprises two fixed plates 12, which are distributed along the stacking direction of the plurality of battery cells 11 and sandwich the plurality of battery cells 11 between the two fixed plates 12. The fixed plate 12 can constrain the battery cell 11, and the two ends of the pressing strip 3 in the stacking direction of the plurality of battery cells 11 are adhesively fixed to the two fixed plates 12. The pressing strip 3 can connect and fix the battery cell 11 and the fixed plate 12, so that the battery cell 11 is more stable relative to the fixed plate 12 and is not easy to shake, thereby improving the stability and stiffness of the overall structure of the battery cell stack 1.

[0039] The battery cell assembly of the above embodiment, the pressing strip 3 is simultaneously connected and fixed to the insulating piece 4 and the connecting area 112, the connection is firm and reliable, so that the pressing strip 3 is not easy to separate from the battery cell 11, and the exposed area of the shell 111 of the battery cell 11 is reduced, which is conducive to improving the insulation performance of the battery cell 11; in addition, the plurality of battery cells 11 can be connected together by the pressing strip 3, which is conducive to improving the structural stiffness and stability of the battery cell stack 1, thereby improving the stability of the overall structure of the battery cell assembly, and further improving the product performance of the battery cell assembly.

[0040] Referring to Figures 1 to 5 In some optional embodiments, the number of battery cell stacks 1 is multiple, there is a gap area 6 between adjacent two battery cell stacks 1, and the adjacent two battery cell stacks 1 are connected and fixed by the pressing strip 3. The pressing strip 3 is adhesively fixed to the battery cell stack 1 by the glue block 5, and the gap area 6 is provided with a glue blocking piece 7 for limiting the overflow of the glue block 5.

[0041] Optionally, the pressing strip 3 comprises a first connecting part 31 and a second connecting part 32, the first connecting part 31 spans the gap area 6 and is fixedly connected with the insulating part 4 on the top wall through the adhesive block 5, and the second connecting part 32 extends into the gap area 6 and is fixedly connected with the connecting area 112 on the side wall through the adhesive block 5. Further, the cross section of the pressing strip 3 is T-shaped.

[0042] The electric cell assembly in the above embodiment can realize the connection and fixation between the electric cell stack 1 and the electric cell stack 1 through the pressing strip 3, so that the plurality of electric cell stacks 1 can be connected as a whole, which is conducive to enhancing the connection stability between the electric cell stacks 1 and the electric cell stack 1 and improving the overall modal of the electric cell assembly. In addition, the adhesive blocking part 7 is arranged, which can effectively reduce the risk of the adhesive block 5 flowing outwards, and is conducive to improving the bonding effect, thereby improving the stability of the overall structure of the electric cell assembly.

[0043] Referring to Figures 1 to 6 In some optional embodiments, the adhesive blocking part 7 is clamped between the adjacent two electric cell stacks 1 and cooperates with the binding belt 2 to limit the overflow of the adhesive block 5. The adhesive blocking part 7 and the binding belt 2 are located below the pressing strip 3 and the adhesive block 5. When filling the structural adhesive, the binding belt 2 and the adhesive blocking part 7 cooperate to block the adhesive block 5 after the structural adhesive solidifies, preventing the adhesive block 5 from flowing downward and overflowing from the gap area 6, which is conducive to improving the bonding effect. Moreover, the adhesive blocking part 7 is clamped between the binding belts 2, which is simple and convenient to install. For example, during assembly, the adhesive blocking part 7 can be first fixedly connected to the binding belt 2 on one of the adjacent two electric cell stacks 1, and then the electric cell stacks 1 are directly assembled, and then the pressing strip 3 is assembled, which is simple and convenient to assemble and is conducive to reducing the influence on the assembly process of the electric cell assembly.

[0044] Referring to Figures 7 to 9 In some optional embodiments, the adhesive blocking part 7 is clamped between the side portions of the adjacent two electric cell stacks 1, and the adhesive blocking part 7 is supported on the binding belt 2, that is, the adhesive blocking part 7 is supported by the binding belt 2. The adhesive blocking part 7 is located below the pressing strip 3 and the adhesive block 5. When filling the structural adhesive, the adhesive blocking part 7 can sufficiently block the adhesive block 5 after the structural adhesive solidifies, preventing the adhesive block 5 from flowing downward and overflowing from the gap area 6, which has good blocking effect and is conducive to improving the bonding effect, thereby improving the stability of the overall structure of the electric cell assembly.

[0045] Referring to Figures 1 to 9 In some optional embodiments, the application further provides a battery module comprising the electric cell assembly according to any one of the above embodiments.

[0046] Referring to Figures 1 to 9 In some optional embodiments, the application further provides a battery pack comprising the electric cell assembly according to any one of the above embodiments.

[0047] The electric core assembly, the battery module and the battery pack have the advantages that the electric core 11 and the electric core 11 are connected and fixed through the pressing strip 3, the rigidity of the overall structure of the electric core stack 1 is improved, the structural stability is good, the pressing strip 3 is connected and fixed with the connecting area 112 of the insulating part 4 and the shell 111, the connection is firm and reliable, the structural stability of the electric core stack 1 is further improved, and therefore the structural stability and the product performance of the electric core assembly, the battery module and the battery pack are improved.

[0048] In the description of the present specification, the description of the terms "the present embodiment", "example", "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.

[0049] 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: The application relates to an electric cell assembly. The electric cell assembly comprises: an electric cell stack comprising a plurality of electric cells arranged in a stack, the electric cells having a shell; an insulating piece arranged on the shell and covering an outer wall of the shell, the insulating piece being provided with an opening, and a part of the outer wall of the shell corresponding to the opening being exposed to form a connecting area; and a pressing strip extending along a stacking direction of the plurality of electric cells and fixedly connected with the insulating piece corresponding to the plurality of electric cells, the pressing strip covering and being fixedly connected with the connecting area. The outer wall of the shell comprises a top wall and a side wall, and the pressing strip is fixedly connected with a part of the insulating piece located on the top wall and / or a part of the insulating piece located on the side wall. A part of the side wall forms the connecting area, and the pressing strip is fixedly connected with the connecting area.

2. The cell assembly of claim 1, wherein, The electric cell assembly comprises a plurality of electric cell stacks, and a gap area is formed between two adjacent electric cell stacks, and the two adjacent electric cell stacks are fixedly connected by the pressing strip, and the pressing strip is fixedly connected with the electric cell stacks by a glue block.

3. The cell assembly of claim 2, wherein, The pressing strip comprises a first connecting part and a second connecting part, the first connecting part is fixedly connected with the insulating piece on the top wall by the glue block and spans the gap area, and the second connecting part is fixedly connected with the connecting area on the side wall by the glue block and extends into the gap area.

4. The cell assembly of claim 3, wherein, The gap area is provided with a glue blocking piece for limiting overflow of the glue block.

5. The cell assembly of claim 4, wherein, The electric cell assembly further comprises a binding belt, the binding belt is arranged around the side of the electric cell stack, and the glue blocking piece is arranged between the sides of the two adjacent electric cell stacks.

6. The cell assembly of claim 4 or 5, wherein, The glue blocking piece is supported on the binding belt.

7. The cell assembly of claim 6, wherein, The electric cell assembly further comprises a binding belt, the binding belt is arranged around the side of the electric cell stack, and the glue blocking piece is arranged between the binding belts on the two adjacent electric cell stacks and cooperates with the binding belts to limit overflow of the glue block.

8. The cell assembly of claim 7, wherein, The insulating piece comprises an insulating sheet and / or an insulating film.

9. The cell assembly of claim 6, wherein, The connecting area is provided with an insulating coating, and the pressing strip is fixedly connected with the insulating coating.

10. The cell assembly of claim 1, wherein, The application relates to an electric cell assembly.

11. The cell assembly of claim 1, wherein, The application relates to an electric cell assembly.

12. A battery module, characterized by ​ 13. A battery pack, characterized by, ​

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