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, wherein each battery cell stacking body comprises a plurality of battery cells which are arranged in a stacking manner; the battery cells in the same battery cell stack body are connected and fixed through the connecting busbars; the battery cells in the two adjacent battery cell stacking bodies are connected and fixed through the pressing strips, and the pressing strips are simultaneously connected and fixed with the connecting busbar. The battery cells are connected through the connecting busbars, and the battery cell stacking bodies are connected and fixed through the pressing strips, so that the overall modality of the battery cell stacking bodies can be improved; the pressing strips are simultaneously connected with the busbars, so that indirect connection between the pressing strips and the battery cells is realized, the battery cells form a whole under the direct connection and indirect connection effects of the pressing strips, and relative fixation between the battery cells and vibration failure prevention are facilitated; and the stability and the product quality of the overall structure of the battery cell assembly, the battery module and the battery pack are 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, the application of batteries is becoming more and more widespread, and the requirements for battery energy are also getting higher and higher. Multiple cells need to be assembled into groups to meet the needs of use. However, there is a problem of unreliable assembly after multiple cells are assembled into groups. The cells are prone to shaking during use, especially when they encounter vibration, which makes them more prone to failure. The quality and stability of the product are difficult to guarantee. 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 problems of poor stability and easy vibration failure when multiple cells are assembled into a group in the prior art, so as to improve the overall structural stability and product quality 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 stack of multiple battery cells, the stack comprising multiple battery cells arranged in a stacked manner;

[0006] A connecting bus is used to connect and fix the battery cells in the same battery cell stack.

[0007] A pressure bar is used to connect and fix the cells in two adjacent cell stacks, and the pressure bar is also connected and fixed to the connecting busbar.

[0008] Optionally, at least a portion of the pressure bar is sandwiched between the connecting bus and the battery cell, or at least a portion of the connecting bus is sandwiched between the pressure bar and the battery cell.

[0009] Optionally, there is a gap area between two adjacent cell stacks, and the pressure bar includes a first connecting part and a second connecting part. The first connecting part is located on the top of the cell and is connected and fixed to the connecting busbar. The second connecting part extends into the gap area and is connected and fixed to the side of the cell of the two adjacent cell stacks.

[0010] Optionally, the connecting bus includes two connected electrode connection portions, which are respectively connected to the terminals of two adjacent battery cells. The electrode connection portions are partially bent and extended to form a transition portion that is connected and fixed to the pressure strip.

[0011] Optionally, the first connecting part is sandwiched between the adapter and the top of the battery cell, the first connecting part is bonded and fixed to the top of the battery cell, and the adapter is pressed and connected to the first connecting part.

[0012] Optionally, the adapter is sandwiched between the first connecting part and the top of the battery cell, and the adapter is bonded and fixed to the first connecting part.

[0013] Optionally, the connecting bus further includes a buffer section that connects two of the electrode connection sections, and the buffer section is adapted to deform when the battery cell expands to absorb the expansion force between two adjacent battery cells.

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

[0015] Optionally, the pressure strip is bonded and fixed to the battery cell by adhesive blocks; the pressure strip is also bonded and fixed to the connecting busbar by adhesive blocks.

[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 battery cells are connected to each other through connecting busbars, and the battery cell stacks are fixed together through pressure strips, which helps to improve the overall mode of the battery cell stacks; based on this, since the connecting busbars are firmly and reliably connected to the battery cells and are not easy to detach, and the pressure strips are also connected to the busbars to achieve indirect connection between the pressure strips and the battery cells, the individual battery cells form a whole under the action of direct and indirect connection of the pressure strips, which helps to keep the battery cells relatively fixed, further improves the rigidity and stability of the overall structure, helps to prevent vibration failure, and thus improves the stability and product quality of the overall structure of the battery cell assembly, battery module, and battery pack. Attached Figure Description

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

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

[0022] Figure 3 for Figure 1 Top 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] Figure 6 for Figure 1 Schematic diagram of the structure of the connecting busbar;

[0026] Figure 7 This is a partial structural schematic diagram of the battery cell assembly of this utility model in Embodiment 2;

[0027] Figure 8 for Figure 7 Exploded view of a core module;

[0028] Figure 9 for Figure 7 Top view of the battery cell assembly;

[0029] Figure 10 for Figure 9 Sectional view at CC;

[0030] Figure 11 for Figure 10 A magnified schematic diagram of part D in the middle.

[0031] Part Number Explanation

[0032] The battery cell stack 1, battery cell 11, fixing plate 12, connecting bus 2, electrode connection part 21, adapter part 22, buffer part 23, pressure strip 3, first connection part 31, second connection part 32, adhesive block 4, gap area 5. Detailed Implementation

[0033] 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.

[0034] 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.

[0035] See Figures 1 to 11 In some optional embodiments, this application provides a battery cell assembly, which includes multiple battery cell stacks 1, a connecting busbar 2, and a pressure bar 3. The battery cell stack 1 includes multiple stacked battery cells 11. The battery cells 11 in the same battery cell stack 1 are connected and fixed to each other through the connecting busbar 2 to realize the electrical connection between the battery cells 11. The battery cells 11 in two adjacent battery cell stacks 1 are connected and fixed to each other through the pressure bar 3, and the pressure bar 3 is also connected and fixed to the connecting busbar 2.

[0036] Optionally, the connecting bus 2 includes a bar, such as a copper bar or an aluminum bar, which has conductive properties to enable series and parallel connection between the battery cells 11. The pressure strip 3 is made of insulating material.

[0037] Optionally, the pressure strip 3 and the battery cell 11 can be bonded and fixed by adhesive block 4 or other adhesive medium.

[0038] Optionally, the pressure strip 3 and the connecting manifold 2 can be bonded and fixed by adhesive blocks or other adhesive media.

[0039] In the battery cell assembly described above, the battery cells 11 in the same battery cell stack 1 are connected to each other via a connecting busbar 2. This achieves both series and parallel connection of the battery cells 11, which is beneficial for meeting power demand, and also ensures that the connected battery cells 11 remain relatively fixed, which is beneficial for improving the stability of the battery cell stack assembly, thereby improving the structural stability of the battery cell stack 1. The battery cell stacks 1 are connected to each other via pressure strips 3, which ensures that the battery cell stacks 1 remain relatively fixed. Moreover, the pressure strips 3 are also connected to the connecting busbar 2, which provides a reliable connection that is not easy to detach, resulting in a stable structure. This is beneficial for improving the overall modal characteristics of the battery cell stack 1, increasing the rigidity and stability of the overall structure, thereby reducing the risk of vibration failure and improving the product quality of the battery cell assembly.

[0040] See Figures 1 to 6 In some alternative embodiments, at least a portion of the pressure strip 3 is sandwiched between the connecting busbar 2 and the battery cell 11.

[0041] Optionally, a gap region 5 is provided between two adjacent cell stacks 1. The pressure strip 3 includes a first connecting part 31 and a second connecting part 32. The first connecting part 31 is located on the top of the cell 11 and is connected and fixed to the connecting busbar 2. The second connecting part 32 extends into the gap region 5 and is connected and fixed to the side of the cell 11 of the two adjacent cell stacks 1. The first connecting part 31 is indirectly connected to the cell 11 through the connecting busbar 2, and the second connecting part 32 is directly connected to the cell 11. The first connecting part 31 and the second connecting part 32 cooperate with different parts of the cell 11 for connection. The connection is firm and the pressure strip 3 is not easy to fall off, which helps to improve the connection strength between the pressure strip 3 and the battery cell 11. At the same time, the pressure strip 3 also connects and fixes adjacent battery cell stacks 1 into a whole, which helps to improve the rigidity and stability of the overall battery cell assembly structure. The second connecting part 32 extends into the gap area 5 between two adjacent battery cell stacks 1, which can make full use of the assembly gap between the two battery cell stacks 1, improve space utilization, and fill the gap area 5, reducing the risk of shaking of the battery cell stacks 1, further improving the stability of the overall structure, thereby reducing the risk of vibration failure. Furthermore, the cross-section of the pressure strip 3 is T-shaped.

[0042] Optionally, the connecting busbar 2 includes two connected electrode connection portions 21, which are respectively connected to the terminals of two adjacent cells 11 within the same cell stack 1. A portion of the electrode connection portion 21 is partially bent and extends towards the adjacent cell stack 1 to form a transition portion 22 that is connected and fixed to the pressure strip 3. Further, the connecting busbar 2 also includes a buffer portion 23, which connects to the two electrode connection portions 21 and is adapted to deform when the cell 11 expands to absorb the expansion force between two adjacent cells 11. Specifically, the buffer portion 23 is arc-shaped with its opening facing the cell 11. In this application, the stacking direction of the multiple cells 11 in the same cell stack 1 is the same as the arrangement direction of the two electrode connection portions 21 in the same connecting busbar 2, i.e., the Y direction in the figures; the multiple cell stacks 1 are arranged along the X direction in the figures.

[0043] Optionally, the first connecting part 31 is sandwiched between the adapter part 22 and the top of the battery cell 11. Alternatively, the first connecting part 31 is pressed onto the top of the battery cell 11, and the adapter part 22 is pressed onto the first connecting part 31. The first connecting part 31 is bonded and fixed to the top of the battery cell 11, and the adapter part 22 is tightly connected to the first connecting part 31. Specifically, the adapter part 22 presses against and connects to the first connecting part 31 along the height direction of the battery cell stack 1, which is the Z-direction shown in the attached figures.

[0044] Optionally, the first connecting part 31 is bonded and fixed to the top of the battery cell 11 by adhesive block 4 or other adhesive medium, which makes the connection simple, firm and reliable.

[0045] Optionally, the first connecting part 31 and the adapter part 22 are bonded and fixed by adhesive blocks or other adhesive media. The adapter part 22 presses down on the first connecting part 31 and is also bonded and fixed to the first connecting part 31. The connection is simple, firm and reliable, which further improves the stability of the overall structure of the battery cell assembly.

[0046] 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 connected and fixed to the two fixing plates 12 at both ends in the stacking direction of the multiple cells 11, so as to realize the connection between the cells 11 and the fixing plates 12, thereby making the cells 11 more stable relative to the fixing plates 12 and less prone to shaking, thereby improving the rigidity and stability of the overall structure of the cell stack 1. Further, the pressure strip 3 is bonded and fixed to the fixing plates 12; specifically, the first connecting part 31 is bonded and fixed to the top of the fixing plate 12 by adhesive blocks or other adhesive media, and the second connecting part 32 is bonded and fixed to the side of the fixing plate 12 by adhesive blocks or other adhesive media.

[0047] In the battery cell assembly of the above embodiment, at least a portion of the pressure strip 3 is sandwiched between the connecting busbar 2 and the battery cell 11, which facilitates the connecting busbar 2 pressing the pressure strip 3 to improve the stability of the pressure strip 3. Specifically, the first connecting part 31 is located between the adapter part 22 and the top of the battery cell 11. The adapter part 22 can apply pressure to the first connecting part 31 to press it tightly, making the connection between the first connecting part 31 and the battery cell 11 more stable and reliable, and less prone to detachment, thus improving the reliability of the connection between the pressure strip 3 and the battery cell 11. The first connecting part 31 is bonded and fixed to the connecting busbar 2, making the structure of the connecting busbar 2 stable. The pressure strip 3 is connected to it, and the connection is reliable, making it less prone to detachment and displacement, thereby further improving the reliability of the connection between the pressure strip 3 and the battery cell 11, and thus improving the overall structural stability and product performance of the battery cell assembly.

[0048] See Figures 7 to 11 In some alternative embodiments, at least a portion of the connecting busbar 2 is sandwiched between the pressure bar 3 and the battery cell 11.

[0049] Optionally, there is a gap area 5 between two adjacent battery cell stacks 1. The pressure bar 3 includes a first connecting part 31 and a second connecting part 32. The first connecting part 31 is located on the top of the battery cell 11 and is connected and fixed to the connecting busbar 2. The second connecting part 32 extends into the gap area 5 and is connected and fixed to the side of the battery cell 11 of the two adjacent battery cell stacks 1.

[0050] Optionally, the connecting busbar 2 includes two connected electrode connection portions 21, which are respectively connected to the poles of two adjacent battery cells 11. The electrode connection portions 21 are partially bent and extend to the adjacent battery cell stack 1 to form a transition portion 22 that is connected and fixed to the pressure strip 3.

[0051] Optionally, the adapter 22 is sandwiched between the first connecting part 31 and the top of the battery cell 11, and the adapter 22 is bonded and fixed to the first connecting part 31.

[0052] Optionally, the adapter 22 and the first connecting part 31 can be bonded and fixed by adhesive block 4 or other adhesive medium, which makes the connection simple, firm and reliable.

[0053] Optionally, the adapter 22 may be made of a high-strength alloy, or the entire connecting busbar 2 may be made of a high-strength alloy.

[0054] In the battery cell assembly of the above embodiment, at least a portion of the connecting busbar 3 is sandwiched between the pressure strip 3 and the battery cell 11, which helps to improve the firmness of the connection between the pressure strip 3 and the connecting busbar 3. Specifically, the first connecting part 31 is bonded and fixed to the connecting busbar 2, the structure of the connecting busbar 2 is stable, the pressure strip 3 is connected to it, the connection is reliable, and the pressure strip 3 is not easy to detach or shift, thereby helping to improve the reliability of the connection between the pressure strip 3 and the battery cell 11, and thus improving the overall structural stability and product performance of the battery cell assembly.

[0055] See Figures 1 to 11 In some alternative embodiments, this application also provides a battery module, which includes a cell assembly as described in any of the above embodiments.

[0056] See Figures 1 to 11 In some alternative embodiments, this application also provides a battery pack that includes cell assemblies as described in any of the above embodiments.

[0057] The battery cell assembly, battery module and battery pack of this utility model are connected to each other through a connecting busbar 2, and adjacent battery cell stacks 1 are connected by a pressure strip 3, so that the relative position between the battery cell stacks 1 is fixed, which is beneficial to improving the overall mode of the battery cell stacks 1 and preventing vibration failure.

[0058] 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.

[0059] 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; A connecting bus is used to connect and fix the battery cells in the same battery cell stack. A pressure bar is used to connect and fix the cells in two adjacent cell stacks, and the pressure bar is also connected and fixed to the connecting busbar.

2. The battery cell assembly according to claim 1, characterized in that, At least a portion of the pressure bar is sandwiched between the connecting bus and the battery cell, or at least a portion of the connecting bus is sandwiched between the pressure bar and the battery cell.

3. The cell assembly according to claim 2, characterized in that, There is a gap area between two adjacent battery cell stacks. The pressure bar includes a first connecting part and a second connecting part. The first connecting part is located on the top of the battery cell and is connected and fixed to the connecting busbar. The second connecting part extends into the gap area and is connected and fixed to the side of the battery cell of the two adjacent battery cell stacks.

4. The cell assembly according to claim 3, characterized in that, The connecting bus includes two connected electrode connection parts, which are respectively connected to the terminals of two adjacent battery cells. The electrode connection parts are partially bent and extended to form a transition part that is connected and fixed to the pressure strip.

5. The cell assembly according to claim 4, characterized in that, The first connecting part is sandwiched between the adapter part and the top of the battery cell, and the first connecting part is bonded and fixed to the top of the battery cell. The adapter part is pressed and connected to the first connecting part.

6. The cell assembly according to claim 4, characterized in that, The adapter is sandwiched between the first connecting part and the top of the battery cell, and the adapter is bonded and fixed to the first connecting part.

7. The cell assembly according to claim 4, characterized in that, The connecting bus also includes a buffer section that connects two of the electrode connection sections and is adapted to deform when the cell expands to absorb the expansion force between two adjacent cells.

8. The cell assembly according to claim 3, characterized in that, The cross-section of the pressure strip is T-shaped.

9. The cell assembly according to claim 1, characterized in that, The pressure strip is bonded and fixed to the battery cell by adhesive blocks; the pressure strip is bonded and fixed to the connecting busbar by adhesive blocks.

10. The cell assembly according to claim 1, 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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