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 and a battery cell connecting piece, wherein the battery cell stacking body is provided with a plurality of stacked battery cells; each battery cell is provided with a shell; the insulating structure comprises an insulating coating, and the insulating coating is coated on the shell and covers at least part of the outer wall of the shell; and the pressing strip extends along the stacking direction of the plurality of battery cells and is fixedly connected with the insulating coatings on the shells of the plurality of battery cells. The pressing strip is fixedly connected with the insulating coating arranged on the shell so as to realize the connection and fixation of the pressing strip and the battery cell, the insulating coating is not easy to separate from the shell, and the connection strength is high, so that the connection reliability of the pressing strip and the battery cell is favorably improved; the batten is connected with the plurality of battery cells of the battery cell stacking body, so that the structural strength of the battery cell stacking body is improved, the structural stability of the assembled battery cells is improved, the stability of the overall structure of the battery cell assembly, the battery module and the battery pack is improved, and the product quality and safety are further 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 usage 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, insulating top plates or films are installed on the cell casing. This means that during assembly, cells can only connect to other cells by connecting to these top plates or films. However, the structural strength of the top plates and insulating films is weak, resulting in poor connection reliability and consequently, poor structural stability after cell assembly. 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 that the overall structure is not stable after multiple cells are assembled in the prior art, so as to improve the stability of the overall structure and thus improve product quality and safety.

[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 structure comprising an insulating coating applied to the housing and covering at least a portion of the outer wall of the housing;

[0007] A pressure strip extends along the stacking direction of the plurality of battery cells and is connected and fixed to the insulating coating on the housing of the plurality of battery cells.

[0008] Optionally, the outer wall of the housing includes a top wall and a side wall, and the insulating coating is disposed on the top wall and / or the side wall.

[0009] Optionally, there may be multiple cell stacks, and the same pressure bar is connected to the insulating coating on the housing of the cells of two adjacent cell stacks.

[0010] Optionally, the pressure strip includes a first connecting portion pressed onto the top of two adjacent cell stacks, the first connecting portion being connected and fixed to the insulating coating disposed on the top wall.

[0011] Optionally, 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 coating disposed on the sidewall.

[0012] Optionally, the pressure strip includes a first connecting portion and a second connecting portion. The first connecting portion is pressed onto the top of two adjacent cell stacks and is connected and fixed to the insulating coating disposed on the top wall. The second connecting portion extends between two adjacent cell stacks and is connected and fixed to the insulating coating disposed on the side wall.

[0013] Optionally, the cross-section of the pressure strip is T-shaped.

[0014] Optionally, the pressure strip and the insulating coating are bonded together with adhesive blocks.

[0015] Optionally, the cell stack further includes two fixing plates, which are distributed along the stacking direction of the plurality of cells and clamp the plurality of cells between the two fixing plates. The pressure strip is bonded and fixed to the two fixing plates at both ends in the stacking direction of the plurality of cells.

[0016] Optionally, the insulation structure further includes a top patch disposed on the top wall, the top patch being staggered from the insulating coating.

[0017] To achieve the above and other related objectives, this application also provides a battery module, including the cell assembly described above.

[0018] To achieve the above and other related objectives, this application also provides a battery pack including the cell assembly described above.

[0019] As described above, the cell assembly, battery module, and battery pack of this utility model have at least the following beneficial effects: the pressure strip is connected and fixed to the insulating coating disposed on the shell to realize the connection and fixation between the pressure strip and the cell. The insulating coating is not easy to separate from the shell, and the connection strength is high, which helps to improve the reliability of the connection between the pressure strip and the cell. Based on this, the connection between the pressure strip and multiple cells of the cell stack helps to improve the structural strength of the cell stack and the structural stability after the cell is assembled, which helps to improve the overall structural stability of the cell assembly, battery module, and battery pack, thereby improving product quality and safety. Attached Figure Description

[0020] Figure 1 This is a partial structural schematic diagram of an embodiment of the battery cell assembly of this utility model;

[0021] Figure 2 for Figure 1 Exploded view of a core module;

[0022] Figure 3 for Figure 1 Side view of the battery cell assembly;

[0023] Figure 4 for Figure 3 Sectional view at point AA;

[0024] Figure 5 for Figure 4 A magnified schematic diagram of part B in the middle.

[0025] Part Number Explanation

[0026] The battery cell stack 1, battery cell 11, housing 111, fixing plate 12, binding strap 2, pressure strip 3, first connecting part 31, second connecting part 32, insulating coating 4, adhesive block 5, gap area 6. Detailed Implementation

[0027] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0028] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings of this specification are only for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effects and objectives of this utility model, should still fall within the scope of the technical content disclosed in this utility model. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model.

[0029] See Figures 1 to 5In some optional embodiments, this application provides a battery cell assembly, which includes a battery cell stack 1, an insulation structure, and a pressure strip 3. In addition to the above-mentioned components, the battery cell assembly may also include a binding strap 2. The battery cell stack 1 includes a plurality of stacked battery cells 11. Each battery cell 11 has a main body and a shell 111. The main body is housed inside the shell 111. The shell 111 may be an aluminum shell or a steel shell. The aluminum shell has good stability and a stable structure that is not easily deformed. The binding strap 2 is placed around or wrapped around the outer periphery of the battery cell stack 1. Binding the outer periphery of the battery cell stack 1 with the binding strap 2 helps to improve the stability of the assembly of multiple battery cells 11 in the same battery cell stack 1. The insulation structure includes an insulating coating 4 with insulating properties. The insulating coating 4 can be sprayed onto the housing 111 and covers at least part of the outer wall of the housing 111. The insulating coating 4 is formed by spraying insulating paint or insulating varnish onto the outer wall of the housing 111. It has the characteristics of paint, has a stable structure, and is not easy to separate from the housing 111. In particular, compared with the top patch, it is not easy to be overturned and detached from the housing 111 even under force. The pressure strip 3 extends along the stacking direction of the multiple cells 11 and is connected and fixed to the insulating coating 4 on the housing 111 of the multiple cells 11. The connection and fixation between the pressure strip 3 and the insulating coating 4 also achieves the connection and fixation between the pressure strip 3 and the cells 11.

[0030] Optionally, the outer wall of the housing 111 includes a top wall and a side wall, and the insulating coating 4 is applied to the top wall and / or the side wall. That is, the pressure strip 3 is only connected and fixed to the insulating coating 4 provided on the top wall of the housing 111, or the pressure strip 3 is only connected and fixed to the insulating coating 4 provided on the side wall of the housing 111, or the pressure strip 3 is connected and fixed to the insulating coating 4 provided on both the top wall and the side wall of the housing 111.

[0031] Optionally, the pressure strip 3 is bonded to the insulating coating 4. Alternatively, the pressure strip 3 and the insulating coating 4 are bonded to each other using adhesive blocks 5. This bonding process is simple and convenient, provides high bonding strength, and prevents detachment.

[0032] Optionally, there are multiple cell stacks 1. The same pressure strip 3 connects to the insulating coating 4 on the housing 111 of the cells 11 of two adjacent cell stacks 1. The pressure strip 3 and the insulating coating 4 cooperate to connect the two adjacent cell stacks 1, allowing them to remain relatively fixed and form a whole, which helps improve the rigidity and stability of the overall cell assembly structure. Furthermore, the pressure strip 3 is connected to two adjacent cell stacks 1 at both ends in its width direction.

[0033] In the above embodiment of the battery cell assembly, the pressure strip 3 is connected and fixed to the insulating coating 4 disposed on the housing 111 to achieve a connection and fixation with the battery cell 11. The connection is firm and reliable and not easy to detach, which helps to improve the stability and reliability of the connection between the pressure strip 3 and the battery cell 11. The pressure strip 3 extends along the stacking direction of multiple battery cells 11 and is connected to the insulating coating 4 on the housing 111 of multiple battery cells 11, so that multiple battery cells 11 of the same battery cell stack 1 can be connected together with the pressure strip 3 through the insulating coating 4, which helps to improve the overall structural rigidity of the battery cell stack 1.

[0034] In some alternative embodiments, the pressure strip includes a first connecting portion pressed onto the top of two adjacent cell stacks, the first connecting portion being connected and fixed to an insulating coating disposed on the top wall. The pressure strip has a simple structure, and the connection and fixing of the pressure strip to the insulating coating on the top wall of the housing is convenient.

[0035] In some optional embodiments, a gap area is provided between two adjacent cell stacks. The pressure strip includes a second connecting portion extending into the gap area between the two adjacent cell stacks. The second connecting portion is connected and fixed to an insulating coating disposed on the side wall of the housing. The pressure strip has a simple structure and is easy, convenient, and reliable to connect. In addition, the second connecting portion extending between the two cell stacks to connect adjacent cell stacks not only makes full use of the gap area between the two cell stacks and improves space utilization, but also helps to reduce the shaking of the cell stacks by filling the gap area, which is beneficial to improving the product quality and safety of the cell assembly.

[0036] See Figures 1 to 5 In some optional embodiments, a gap region 6 is provided between two adjacent cell stacks 1. The pressure strip 3 includes a first connecting portion 31 and a second connecting portion 32. The first connecting portion 31 is pressed across the gap region 6 onto the top of the two adjacent cell stacks 1 and is connected and fixed to the insulating coating 4 provided on the top wall. That is, the two ends of the first connecting portion 31 in the width direction are respectively connected and fixed to the cells 11 of the two adjacent cell stacks 1. The second connecting portion 32 extends into the gap region 6 between the two adjacent cell stacks 1, and is connected and fixed to the insulating coating 4 provided on the side wall. That is, the opposite sides of the second connecting portion 32 are respectively connected and fixed to the cells 11 of the two adjacent cell stacks 1.

[0037] Optionally, the cross-section of the pressure strip 3 is T-shaped.

[0038] Optionally, the cell stack 1 further includes two fixing plates 12, which are distributed along the stacking direction of the multiple cells 11 and clamp the multiple cells 11 between the two fixing plates 12. The fixing plates 12 can provide constraints for the cells 11. The pressure strip 3 is bonded and fixed to the two fixing plates 12 at both ends in the stacking direction of the multiple cells 11. That is, the pressure strip 3 is connected and fixed to the two fixing plates 12 at both ends in its length direction. The pressure strip 3 can connect and fix the cells 11 to the fixing plates 12, making the cells 11 more stable relative to the fixing plates 12 and less prone to shaking, thereby improving the stability and rigidity of the overall structure of the cell stack 1. Furthermore, the first connecting part 31 is bonded and fixed to the two fixing plates 12 at both ends in the stacking direction of the multiple cells 11 by adhesive blocks. That is, the first connecting part 31 is bonded and fixed to the two fixing plates 12 at both ends in its length direction. In this application, the stacking direction, extension direction, length direction of the pressure bar 3, and length direction of the first connecting part 31 of the same cell stack 1 are the same, i.e., the Y direction in the figure; the arrangement direction, width direction of the pressure bar 3, and width direction of the first connecting part 31 of the two cell stacks 1 connected by the same pressure bar 3 are the same, i.e., the X direction in the figure; the height direction of the cell stack 1 and the height direction of the cell 11 are the same, i.e., the Z direction in the figure.

[0039] In 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 pressure strip 3 to different parts of the housing 111, increasing the contact area and improving the connection strength between the pressure strip 3 and the housing 111. At the same time, the pressure strip 3 also realizes the connection and fixation of adjacent battery cell stacks 1, resulting in a stable structure. This helps to improve the rigidity and stability of the overall structure of the battery cell assembly, thereby improving the product quality and safety of the battery cell assembly.

[0040] See Figures 1 to 5 In some optional embodiments, the insulation structure further includes a top patch disposed on the top wall of the housing 111, the top patch being staggered from the insulating coating 4. The simultaneous presence of the top patch and the insulating coating 4 on the top wall of the housing 111 serves two purposes: firstly, the excellent insulation properties of the top patch enhance the insulation of the top wall of the housing 111; secondly, the strong connection between the insulating coating 4 and the housing 111 prevents the pressure strip 3 from easily detaching from the housing 111. This ensures the insulation of the battery cell 11 while reducing the risk of the pressure strip 3 detaching from the battery cell 11, thus improving the product quality of the battery cell assembly.

[0041] See Figures 1 to 5 In some alternative embodiments, this application also provides a battery module, which includes a cell assembly as described in any of the above embodiments.

[0042] See Figures 1 to 5In some alternative embodiments, this application also provides a battery pack that includes cell assemblies as described in any of the above embodiments.

[0043] In this utility model, the cell assembly, battery module, and battery pack have a pressure strip 3 that is directly connected to the insulating coating 4 on the housing 111. This connection has high strength, and the insulating coating 4 is not easy to fall off the housing 111, thus making it difficult for the pressure strip 3 to detach from the housing 111. Furthermore, the same pressure strip 3 is connected and fixed to multiple cells 11 of the same cell stack 1, or the same pressure strip 3 is connected and fixed to multiple cells 11 of adjacent cell stacks 1. This increases the contact area when the pressure strip 3 is connected and fixed, which is beneficial for dispersing stress, making it less likely to detach, and making the connection more reliable and less prone to shaking. This further improves the overall stability of the cell assembly structure and makes it safer, thereby improving the product quality and safety of the cell assembly, battery module, and battery pack.

[0044] In the description of this specification, the references to terms such as "this embodiment," "example," and "specific example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0045] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A battery cell assembly, characterized in that, include: A battery cell stack comprising a plurality of stacked battery cells, each battery cell having a housing; An insulating structure comprising an insulating coating applied to the housing and covering at least a portion of the outer wall of the housing; A pressure strip extends along the stacking direction of the plurality of battery cells and is connected and fixed to the insulating coating on the housing of the plurality of battery cells.

2. The battery cell assembly according to claim 1, characterized in that, The outer wall of the housing includes a top wall and a side wall, and the insulating coating is disposed on the top wall and / or the side wall.

3. The cell assembly according to claim 2, characterized in that, The number of cell stacks is multiple, and the same pressure bar is connected to the insulating coating on the housing of the cell of two adjacent cell stacks.

4. The cell assembly according to claim 3, characterized in that, 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 coating disposed on the top wall.

5. The cell assembly according to claim 3, characterized in that, 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 coating disposed on the side wall.

6. The cell assembly according to claim 3, characterized in that, 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 coating provided on the top wall. The second connecting part extends between two adjacent cell stacks and is connected and fixed to the insulating coating provided on the side wall.

7. The cell assembly according to claim 6, characterized in that, The cross-section of the pressure strip is T-shaped.

8. The cell assembly according to any one of claims 1 to 7, characterized in that, The pressure strip and the insulating coating are bonded and fixed together by adhesive blocks.

9. The cell assembly according to any one of claims 1 to 7, characterized in that, The battery cell stack also includes two fixing plates, which are distributed along the stacking direction of the multiple battery cells and clamp the multiple battery cells between the two fixing plates. The pressure strip is bonded and fixed to the two fixing plates at both ends in the stacking direction of the multiple battery cells.

10. The cell assembly according to claim 2, characterized in that, The insulation structure also includes a top patch disposed on the top wall, the top patch being staggered from the insulating coating.

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

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

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