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 plurality of battery cell stacking bodies, each battery cell stacking body comprises a plurality of stacked battery cells, and each battery cell is provided with a shell; the insulating part is located at the top of the shell and covers at least part of the top wall of the shell; and at least part of the pressing strip is located between the shell and the insulating part, and the pressing strip is fixedly connected with the shell so as to fixedly connect the two adjacent battery cell stacking bodies. The battery cell assembly, the battery module and the battery pack at least have the following beneficial effects that the pressing strips are directly connected with the shells of the battery cells, are not easy to separate, are firm and reliable in connection and are good in structural stability after being assembled, so that the stability of the whole structure of the battery cell assembly is favorably improved, and the product quality and safety are further improved; on the basis, the pressing strip is located between the insulating part and the shell, so that the pressing strip is directly connected with the shell conveniently, the process is simplified, and the cost is reduced.

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, insulating top plates are placed on the top surface of the cells containing electrodes. However, if a cell needs to connect to other cells via these top plates during assembly, the weak structural strength and poor connection reliability of the top plates result in poor structural stability after 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 stack of multiple battery cells, the stack comprising multiple battery cells arranged in a stacked manner, each battery cell having a housing;

[0006] An insulating element located at the top of the housing and covering at least a portion of the top wall of the housing;

[0007] A pressure strip, at least a portion of which is located between the housing and the insulating member, and which is connected and fixed to the housing to connect and fix two adjacent cell stacks.

[0008] Optionally, the pressure bar includes a first connecting portion, one end of which is fixedly connected to the top wall of the housing in the width direction of the cell stack, and the other end of which extends toward the adjacent cell stack and is fixedly connected to the top wall of the housing of the cell.

[0009] Optionally, the first connecting part is bonded and fixed to the top wall of the housing by adhesive blocks.

[0010] Optionally, there is a gap area between two adjacent cell stacks, and the pressure bar includes a second connecting portion that extends into the gap area and is connected and fixed to the side wall of the housing of the cell of the two adjacent cell stacks.

[0011] Optionally, the second connecting part is bonded and fixed to the side wall of the housing by adhesive blocks.

[0012] Optionally, the pressure strip includes a first connecting portion and a second connecting portion. The two ends of the first connecting portion in the width direction of the cell stack are respectively bonded and fixed to the top wall of the housing of the cell of the two adjacent cell stacks. The second connecting portion extends into the gap area between the two adjacent cell stacks and is bonded and fixed to the side wall of the housing of the cell of the two adjacent cell stacks.

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

[0014] Optionally, the insulating member covers at least two adjacent cell stacks, and a partial bulge of the insulating member is formed as an arch, the arch covering at least a portion of the pressure strip connecting the two adjacent cell stacks.

[0015] Optionally, the pressure strip extends along the stacking direction of multiple cells within the same cell stack and is connected and fixed to the housing of multiple cells in two adjacent cell stacks.

[0016] Optionally, the cell stack further includes two fixing plates, which are distributed along the stacking direction of the multiple cells and clamp the multiple cells between the two fixing plates. The pressure strip is connected and fixed to the two fixing plates at both ends in the stacking direction of the multiple cells.

[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 battery cell assembly, battery module, and battery pack of this utility model have at least the following beneficial effects: the pressure strip is directly connected to the housing of the battery cell, making it difficult to detach, and the connection is firm and reliable. The structure is stable after assembly, which helps to improve the overall stability of the battery cell assembly structure, thereby improving product quality and safety. Based on this, the pressure strip is located between the insulating component and the housing, which ensures the insulation performance of the battery cell while facilitating the direct connection of the pressure strip to the housing, which helps to simplify the process and reduce costs. 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 a battery cell assembly;

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

[0024] Figure 5 for Figure 4 A magnified view of a portion of point B in the middle.

[0025] Part Number Explanation

[0026] Cell stack 1, cell 11, housing 111, fixing plate 12, strap 2, pressure strip 3, first connecting part 31, second connecting part 32, insulating part 4, arched part 41, 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 3In some optional embodiments, this application provides a battery cell assembly, which includes multiple battery cell stacks 1, an insulating member 4, and a pressure strip 3. In addition to the aforementioned components, the battery cell assembly may also include a binding strap 2. The battery cell stack 1 includes multiple stacked battery cells 11. Each battery cell 11 has a main body and a housing 111. The main body is housed inside the housing 111. The housing 111 may be an aluminum or steel shell. The aluminum shell has good stability and a stable structure that is not easily deformed. The binding strap 2 surrounds or wraps 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 improve the stability of assembling multiple battery cells 11 within the same battery cell stack 1. The insulating member 4 is located on the top of the housing 111 and covers at least a portion of the top wall of the housing 111. The insulating member 4 and the terminals of the battery cells 11 are located on the same side of the housing 111. The insulating member 4 has clearance holes to avoid the terminals. At least a portion of the pressure strip 3 is located between the housing 111 and the insulating member 4, and the pressure strip 3 is connected and fixed to the housing 111 to connect and fix two adjacent battery cell stacks 1. In other words, the connection and fixation between two adjacent battery cell stacks 1 can be achieved through the connection between the pressure strip 3 and the housing 111, so that the adjacent battery cell stacks 1 remain relatively fixed, which is beneficial to improving the rigidity and stability of the overall structure.

[0030] Optionally, the pressure strip 3 is bonded and fixed to the housing 111 by adhesive block 5.

[0031] Optionally, the insulating member 4 covers at least two adjacent cell stacks 1 in the width direction. The insulating member 4 can be bonded and fixed to the cell stacks 1. The insulating member 4 covers at least two cell stacks 1, and is connected and fixed to different cell stacks 1, increasing the contact area with the cell stacks 1. This improves the connection strength between the insulating member 4 and the cell stacks 1, making it less likely for the insulating member 4 to detach from the cell stacks 1. A partial bulge of the insulating member 4 is formed as an arch 41, which covers at least a portion of the pressure strip 3 connecting the two adjacent cell stacks 1, helping the pressure strip 3 maintain connection stability. Furthermore, the insulating member 4 includes a top patch with good insulation properties.

[0032] Optionally, the pressure strip 3 extends along the stacking direction of multiple cells 11 within the same cell stack 1 and is connected and fixed to the housings 111 of multiple cells 11 in two adjacent cell stacks 1. Furthermore, the pressure strip 3 is bonded and fixed to the housings 111 of each cell 11 in two adjacent cell stacks 1, making it less prone to shaking and improving the rigidity and structural stability of the cell stack 1.

[0033] 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. A pressure strip 3 is connected and fixed to the two fixing plates 12 at both ends along the stacking direction of the multiple cells 11, for example, by adhesive bonding. That is, the pressure strip 3 is connected and fixed to the two fixing plates 12 at both ends along its length. 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 overall stability and rigidity of the cell stack 1. In this application, the stacking direction, length direction, thickness direction of multiple cells 11 in the same cell stack 1 are the same as the length direction of the pressure strip 3, i.e., the Y direction in the figure; the width direction, length direction of the cell stack 1, and arrangement direction of two cell stacks 1 connected by the same pressure strip 3 are the same as the width direction of the pressure strip 3, i.e., the X direction in the figure; the height direction of the cell stack 1 is the same as the height direction of the cell 11, i.e., the Z direction in the figure.

[0034] In the above embodiment of the battery cell assembly, the pressure strip 3 is directly connected to the housing 111 of the battery cell 11. The pressure strip 3 is not easy to detach from the housing 111, which ensures the connection strength. The battery cell 11 is not easy to shake, so that the adjacent battery cell stack 1 can be stably connected through the pressure strip 3. This is beneficial to improving the stability and rigidity of the overall structure of the battery cell stack 1, thereby improving the product quality and safety of the battery cell assembly.

[0035] In some alternative embodiments, the pressure strip 3 includes a first connecting portion 31. In the width direction of the cell stack 1, one end of the first connecting portion 31 is connected and fixed to the top wall of the housing 111, and the other end of the first connecting portion 31 extends to the adjacent cell stack 1 and is connected and fixed to the top wall of the housing 111 of the cell 11 therein. In other words, the two ends of the pressure strip 3 in its width direction are respectively connected and fixed to the top walls of the housing 111 of the cell 11 of two adjacent cell stacks 1.

[0036] Optionally, the first connecting part 31 is bonded and fixed to the top wall of the housing 111 by adhesive block 5.

[0037] The cell assembly described in the above embodiment has a simple structure for the pressure bar 3, and the connection is simple, convenient, and reliable.

[0038] In some alternative embodiments, there is a gap region 6 between two adjacent cell stacks 1, and the pressure strip 3 includes a second connecting part 32, which extends into the gap region 6 and is connected and fixed to the side wall of the housing 111 of the cell 11 of the two adjacent cell stacks 1.

[0039] Optionally, the second connecting part 32 is bonded and fixed to the side wall of the housing 111 by adhesive block 5.

[0040] The cell assembly described in the above embodiment has a simple structure for the pressure strip 3, and the connection is simple, convenient, and reliable. In addition, the pressure strip 3 extends into the gap area 6 to connect two adjacent cell stacks 1, which not only makes full use of the assembly gap and improves the space utilization rate, but also helps to reduce the shaking of the cell stacks 1 by filling the gap area 6, which helps to improve the product quality and safety of the cell assembly.

[0041] See Figures 1 to 5 In some optional embodiments, the pressure strip 3 includes a first connecting portion 31 and a second connecting portion 32. The two ends of the first connecting portion 31 in the width direction of the cell stack 1 are respectively connected and fixed to the top wall of the housing 111 of the cells 11 of two adjacent cell stacks 1. That is, the two ends of the first connecting portion 31 in its width direction are respectively connected and fixed to the top wall of the housing 111 of the cells 11 of two adjacent cell stacks 1. The second connecting portion 32 extends into the gap area 6 between two adjacent cell stacks 1 and is connected and fixed to the side wall of the housing 111 of the cells 11 of the two adjacent cell stacks 1.

[0042] Optionally, the first connecting part 31 is bonded and fixed to the top wall of the housing 111 by adhesive block 5.

[0043] Optionally, the second connecting part 32 is bonded and fixed to the side wall of the housing 111 by adhesive block 5.

[0044] Optionally, the cross-section of the pressure strip 3 is T-shaped.

[0045] 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, which increases the contact area and helps to improve 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 between the adjacent battery cell stack 1, which makes the structure stable and helps to improve the overall stability of the battery cell assembly.

[0046] 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.

[0047] See Figures 1 to 5 In some alternative embodiments, this application also provides a battery pack that includes cell assemblies as described in any of the above embodiments.

[0048] In this utility model, the cell assembly, battery module, and battery pack have a pressure strip 3 directly connected to the housing 111, which provides high connection strength and prevents it from easily detaching from the housing 111. The same pressure strip 3 is also connected and fixed to the adjacent cell stack 1, which helps to disperse stress, prevents detachment, and makes the connection more reliable and less prone to shaking. This further improves the overall stability of the cell assembly structure and enhances safety, thereby improving the product quality and safety of the cell assembly, battery module, and battery pack.

[0049] 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.

[0050] 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 stack of multiple battery cells, the stack comprising multiple battery cells arranged in a stacked manner, each battery cell having a housing; An insulating element located at the top of the housing and covering at least a portion of the top wall of the housing; A pressure strip, at least a portion of which is located between the housing and the insulating member, and which is connected and fixed to the housing to connect and fix two adjacent cell stacks.

2. The battery cell assembly according to claim 1, characterized in that, The pressure bar includes a first connecting portion. In the width direction of the cell stack, one end of the first connecting portion is connected and fixed to the top wall of the housing, and the other end of the first connecting portion extends to the adjacent cell stack and is connected and fixed to the top wall of the housing of the cell.

3. The cell assembly according to claim 2, characterized in that, The first connecting part is bonded and fixed to the top wall of the housing by adhesive blocks.

4. The cell assembly according to claim 1, characterized in that, There is a gap area between two adjacent cell stacks, and the pressure bar includes a second connecting part that extends into the gap area and is connected and fixed to the side wall of the housing of the cell of the two adjacent cell stacks.

5. The cell assembly according to claim 4, characterized in that, The second connecting part is bonded and fixed to the side wall of the housing by adhesive blocks.

6. The cell assembly according to claim 1, characterized in that, The pressure strip includes a first connecting part and a second connecting part. The two ends of the first connecting part in the width direction of the cell stack are respectively bonded and fixed to the top wall of the housing of the cell of the two adjacent cell stacks. The second connecting part extends into the gap area between the two adjacent cell stacks and is bonded and fixed to the side wall of the housing of the cell of the two adjacent cell stacks.

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

8. The cell assembly according to claim 1, characterized in that, The insulating element covers at least two adjacent cell stacks, and a portion of the insulating element is formed as an arch, which covers at least a portion of the pressure strip connecting the two adjacent cell stacks.

9. The cell assembly according to claim 1, characterized in that, The pressure strip extends along the stacking direction of multiple cells within the same cell stack and is connected and fixed to the housing of multiple cells in two adjacent cell stacks.

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

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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