Battery pack

Abstract

The utility model belongs to a battery pack in the technical field of power batteries. Comprising a battery cell group module, a bottom plate and a top cover, the connecting beams are arranged at the two ends of the battery cell stacking body; the two side plate groups are distributed on the two sides of the battery cell stacking bodies, each side plate group comprises a plurality of detachably connected side plate sections, and the side plate sections located on the two sides of the same battery cell stacking body are detachably connected with the connecting beams located at the two ends of the corresponding battery cell stacking body and clamp and fix the battery cell stacking bodies during connection; the connecting beams connected with the two ends of the side plate group in the plurality of connecting beams are connected with the side plate group to form a surrounding beam of the battery pack, and the top cover and the bottom plate are distributed on the two sides of the battery cell group module and are connected with the surrounding beam to form a shell of the battery pack. Assembly is flexible, the number of parts is reduced, the space utilization rate is increased, and cost is reduced.

Description

Technical Field

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

[0002] Currently, with the increasingly widespread application of batteries, the demand for electricity is becoming more diversified, often requiring the combination of multiple battery cell stacks to meet power needs. Due to the limitations of the battery pack casing, it is not convenient to flexibly adjust the number of battery cell stacks assembled, which can easily lead to space waste and increased costs, and is not conducive to improving space utilization. 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 battery pack to solve the problem of low space utilization in the prior art, so as to improve the energy density of the battery pack and reduce the cost.

[0004] To achieve the above and other related objectives, this utility model provides a battery pack, including a cell assembly module, a base plate, and a top cover, wherein the cell assembly module includes:

[0005] Multiple battery cell stacks are arranged along a first direction, and each battery cell stack includes multiple battery cells stacked along a second direction.

[0006] Multiple connecting beams are provided at both ends of each of the cell stacks distributed along the first direction;

[0007] Two side plate groups are distributed along the second direction on both sides of the cell stack. Each side plate group includes multiple side plate segments distributed along the first direction and detachably connected. The side plate segments located on both sides of the same cell stack are detachably connected to the connecting beams located at both ends of the corresponding cell stack and clamp and fix the cell stack when connected.

[0008] Among them, the connecting beams that are connected to both ends of the side plate group and the side plate group are connected to form the surrounding beam of the battery pack. The top cover and the bottom plate are distributed on both sides of the cell assembly module along a third direction and are connected to the surrounding beam to form the outer shell of the battery pack.

[0009] Optionally, a sealing strip is provided at the connection between two adjacent side plate segments within the same side plate group.

[0010] Optionally, the side plate segment has a first connecting portion connected to an adjacent side plate segment, and the sealing strip is sandwiched between two first connecting portions of two adjacent side plate segments and is adapted to be squeezed and deformed when the two first connecting portions are connected and locked with the connecting beam to seal the assembly gap between the two first connecting portions.

[0011] Optionally, two connected first connecting parts are stacked along the second direction and locked to the connecting beam by a locking structure.

[0012] Optionally, the locking structure includes bolts that pass through the two first connecting portions along the second direction and are locked to the connecting beam.

[0013] Optionally, one of the two connected first connecting parts has an L-shaped cross-section, and the other first connecting part has an inverted L-shaped cross-section that is adapted to and fits the L-shaped structure.

[0014] Optionally, one of the two connected first connecting parts has a mounting groove on the side of the first connecting part facing the other first connecting part, and the sealing strip is installed in the mounting groove.

[0015] Optionally, the base plate is welded or bolted to the surrounding beam; a sealing gasket is provided between the top cover and the surrounding beam, and the top cover and the surrounding beam are bolted together, and the sealing gasket is squeezed during connection to seal the assembly gap between the top cover and the surrounding beam.

[0016] Optionally, the battery cell includes a pouch cell.

[0017] Optionally, the top cover is flat; the bottom plate is flat.

[0018] Optionally, the top cover, the surrounding beam, and the bottom plate are sealed together to define an installation space for accommodating the battery cell stack, the installation space being filled with coolant that immerses the battery cell stack.

[0019] Optionally, the top cover and / or the bottom plate are constructed as liquid-cooled plates.

[0020] As described above, the battery pack of this utility model has at least the following beneficial effects: The detachable connection of multiple side plate segments to the connecting beam provides clamping force to fix the cell stack, which not only makes the cell stack less likely to fall off and scatter, but also allows for flexible adjustment of the number of side plate segments according to requirements. This facilitates flexible adjustment of the accommodating space based on the number of cell stacks, resulting in flexible assembly, improved space utilization, and reduced costs. Based on this, some of the connecting beams and side plate assemblies are constructed as the surrounding beams of the battery pack. The surrounding beams, bottom plate, and top cover work together to encapsulate multiple cell stacks without the need for a separate outer shell, which helps reduce the number of components, further improves space utilization, and thus helps increase the energy density of the battery pack and further reduce costs. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an embodiment of the battery pack of this utility model;

[0022] Figure 2 for Figure 1 A schematic diagram of a partial explosion of the battery pack in the middle;

[0023] Figure 3 for Figure 1 A schematic diagram of the battery pack when the top cover is removed;

[0024] Figure 4 for Figure 1 Top view of the battery pack with the top cover removed;

[0025] Figure 5 for Figure 4 A magnified schematic diagram of part A in the middle;

[0026] Figure 6 for Figure 1 Partial sectional view of the battery pack from a first-person perspective

[0027] Figure 7 for Figure 1 A cross-sectional view of the battery pack from a second perspective;

[0028] Figure 8 for Figure 7 A magnified schematic diagram of part B in the middle.

[0029] Part Number Explanation

[0030] 1. Battery cell stack 1, battery cell 11, connecting beam 2, side plate assembly 3, side plate section 31, first connecting part 311, mounting groove 312, sealing strip 4, locking structure 5, sealing gasket 6, bottom plate 7, top cover 8, bolt 9. Detailed Implementation

[0031] 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.

[0032] 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.

[0033] See Figure 1 and Figure 2 In some optional embodiments, the present invention provides a battery pack, which includes a cell assembly module, a base plate 7, and a top cover 8. The cell assembly module includes multiple cell stacks 1, multiple connecting beams 2, and two side plate assemblies 3. The multiple cell stacks 1 are arranged along a first direction, and each cell stack 1 includes multiple cells 11 stacked along a second direction. Connecting beams 2 are arranged at both ends of each cell stack 1 distributed along the first direction. The two side plate assemblies 3 are distributed along the second direction on both sides of the cell stack 1. Each side plate assembly 3 includes multiple side plate segments 31 distributed along the first direction and detachably connected. The side plate segments 31 located on both sides of the same cell stack 1 are detachably connected to the connecting beams 2 located at both ends of the corresponding cell stack 1, and clamp and fix the cell stack 1 during connection. That is, the side plate segments 31 located around the same cell stack 1 and the connecting beams 2 are interconnected to provide a preload force to fix the cell stack 1, which helps to prevent the cell stack 1 from falling off and scattering. The top cover 8 and the bottom plate 7 are distributed along a third direction on opposite sides of the cell assembly module, or in other words, the top cover 8 and the bottom plate 7 are distributed along a third direction, and the cell assembly module is located between the top cover 8 and the bottom plate 7; among them, the connecting beam 2 that is connected to both ends of the side plate group 3 and the connecting structure of the side plate group 3 are the surrounding beams of the battery pack, and the connecting structure of the surrounding beams, the top cover 8 and the bottom plate 7 are the outer shell of the battery pack, realizing the encapsulation of the cell stack 1.

[0034] In this invention, the first direction, the second direction, and the third direction are perpendicular to each other. Specifically, the arrangement direction of the multiple battery cell stacks 1, the arrangement direction of the multiple side plate segments 31 in each side plate group 3, the length direction of the side plate segments 31, the arrangement direction of the multiple connecting beams 2, the length direction of the battery cell stack 1, and the length direction of the battery cell 11 are the same as the first direction, i.e., the X direction in the figures; the arrangement direction of the multiple battery cells 11 in each battery cell stack 1, the length direction of the connecting beams 2, the width direction of the battery cell stack 1, the thickness direction of the battery cell 11, and the second direction are the same, i.e., the Y direction in the figures; the height direction of the battery cell stack 1, the height direction of the connecting beams 2, the height direction of the side plate segments 31, and the height direction of the battery cell 11 are the same as the third direction, i.e., the Z direction in the figures.

[0035] Optionally, multiple side plate segments 31 of the same side plate assembly 3 correspond one-to-one with multiple battery cell stacks 1. That is, each battery cell stack 1 has an independent side plate segment 31 arranged on each side along the second direction. This assembly is simple and flexible, and the number of side plate segments 31 in the side plate assembly 3 can be increased or decreased according to the actual number of battery cell stacks 1 to meet different charge requirements and facilitate universal configuration. Specifically, the side plate assembly 3 and part of the connecting beam 2 are constructed as the surrounding beam of the battery pack. The number of side plate segments 31 can be flexibly adjusted according to the number of battery cell stacks 1, thereby adjusting the size of the surrounding beam and the size of the space enclosed by the surrounding beam.

[0036] Optionally, the battery cell 11 includes a pouch cell, and the two ends of the battery cell 11 distributed along the first direction have tabs, or in other words, the two ends of the battery cell stack 1 distributed along the first direction are tab ends. Further, there is a gap between the connecting beam 2 and the tab ends of the battery cell stack 1, meaning that the length of the side plate segment 31 is greater than the length of the battery cell stack 1, so that the connecting beam 2 does not contact the tab ends of the battery cell stack 1. This helps to avoid squeezing the tab ends and affecting the performance of the battery cell stack 1, and also helps to ensure insulation. The side plate segments 31 located on both sides of the same battery cell stack 1 cooperate to clamp and fix the battery cell stack 1 along the second direction. The two sides of the battery cell 11 distributed along the second direction are the sides with the largest surface area of ​​the battery cell 11. The cooperation of the two side plate segments 31 to clamp the sides with the largest surface area of ​​the battery cell 11 helps to improve the stability of the overall structure.

[0037] Optionally, the top cover 8 is flat, with a simple structure and easy assembly, which helps to reduce costs and increase the grouping rate.

[0038] Optionally, the base plate 7 is flat, with a simple structure and easy assembly, which helps to reduce costs and increase the grouping rate.

[0039] Specifically, during the assembly process, the side plate section 31 of the side plate group 3 is connected to the connecting beam 2 to clamp and fix the corresponding cell stack 1. Then, the assembled cell group module is placed on the base plate 7 and connected and fixed to the base plate 7. Then, the top cover 8 is covered and fixed to the side plate group 3 and the connecting beam 2 located at both ends of the side plate group 3, thus completing the assembly of the battery pack.

[0040] In the battery pack of the above embodiment, the side plate assembly 3, in cooperation with the connecting beam 2, can provide a pre-tightening force to clamp the cell stack 1 to fix the cell stack 1, resulting in a stable structure. The multiple cells 11 of the cell stack 1 are not easily detached or scattered. The side plate assembly 3 includes multiple independently arranged side plate segments 31. The side plate segments 31 can be detachably connected to each other and to the connecting beam 2, which facilitates flexible assembly according to the number of cell stacks 1, avoids space waste, and helps to improve space utilization and energy density, thereby helping to reduce costs. In addition, the multiple side plate segments 31, part of the connecting beam 2, the bottom plate 7 and the top cover 8 of the side plate assembly 3 can be connected and cooperated to realize the encapsulation of multiple cell stacks 1, reducing structural components and helping to further improve the energy density of the battery pack and reduce costs.

[0041] See Figures 3 to 6 In some alternative embodiments, a sealing strip 4 is provided at the connection between two adjacent side plate segments 31, and the sealing strip 4 can seal the assembly gap at the connection between the two side plate segments 31.

[0042] Optionally, the side plate segment 31 has a first connecting portion 311 that connects to an adjacent side plate segment 31. A sealing strip 4 is sandwiched between the two first connecting portions 311 of the two adjacent side plate segments 31 and is adapted to be compressed and deformed when the two first connecting portions 311 are connected and locked to the connecting beam 2 to seal the assembly gap between the two first connecting portions 311. Further, the two connected first connecting portions 311 are stacked along a second direction and locked to the connecting beam 2 by a locking structure 5. The stacking direction of the two first connecting portions 311 is the same as the direction in which the side plate segments 31 clamp the battery cell stack 1, making installation and adjustment simple and convenient, reducing the requirements for installation tolerances, and thus reducing production difficulty. Further still, the locking structure 5 includes a bolt that passes through the two first connecting portions 311 along the second direction and is locked to the connecting beam 2. Specifically, the connecting beam 2 is provided with a locking sleeve that mates with the bolt. One end of the bolt passes through the two stacked first connecting portions 311 and is threadedly connected to the sleeve, making the connection simple and convenient.

[0043] Optionally, one of the two connected first connecting parts 311 has an L-shaped cross-section, and the other first connecting part 311 has an inverted L-shaped cross-section that fits and conforms to the L-shaped structure. The structure is simple and easy to assemble.

[0044] Optionally, the side panel section 31 can be made of aluminum profile, injection molded part or die casting part.

[0045] Optionally, one of the two connected first connecting parts 311 has a mounting groove 312 on the side facing the other first connecting part 311, and the sealing strip 4 is installed in the mounting groove 312, making the installation operation simple and convenient.

[0046] In the battery pack of the above embodiment, the sealing strip 4 can be squeezed and deformed to seal the assembly gap at the connection of two adjacent side plate sections 31, which not only ensures the sealing performance of the assembly, but also helps to reduce the requirements for installation tolerance, thereby reducing the assembly difficulty and improving the assembly quality.

[0047] See Figure 1 , Figure 2 , Figure 7 and Figure 8 In some alternative embodiments, the base plate 7 is fixed to the surrounding beam by welding or bolting. Bolting the base plate 7 to the surrounding beam simplifies assembly; welding the base plate 7 to the surrounding beam ensures good sealing during assembly.

[0048] See Figure 1 , Figure 2 , Figure 7 and Figure 8 In some optional embodiments, a sealing gasket 6 is provided between the top cover 8 and the surrounding beam. The top cover 8 and the surrounding beam are connected and fixed by bolts 9. When the connection and fixing are performed, the sealing gasket 6 is squeezed to seal the assembly gap between the top cover 8 and the surrounding beam. The assembly operation is simple and convenient. The surrounding beam is provided with a connecting hole. One end of the bolt 9 passes through the top cover 8 in a third direction and is connected and locked with the connecting hole on the surrounding beam.

[0049] See Figure 1 and Figure 2 The top cover 8, the surrounding beam and the bottom plate 7 are sealed together to define an installation space for accommodating the battery cell stack 1. In other words, the battery pack housing constructed by the connection of the top cover 8, the surrounding beam and the bottom plate 7 has an installation space filled with coolant that immerses the battery cell stack.

[0050] Optionally, the housing is provided with an inlet and an outlet. Coolant is filled into the installation space from the inlet until it flows out from the outlet, so that the coolant fills the installation space and the cell stack 1 in the installation space is completely immersed in the coolant, achieving immersion cooling with good cooling effect.

[0051] Optionally, the top cover 7 and / or the bottom plate 8 are configured as liquid cooling plates to facilitate cooling of the cell stack 1, which can effectively save space and improve the energy density of the battery pack.

[0052] Optionally, the battery pack contains one cell module. The assembled cell module 100 can be directly connected and assembled with the top cover 8 and the bottom plate 7, simplifying the subsequent installation steps and making the installation simple and efficient.

[0053] The battery pack of this utility model uses the side plate assembly 3 and the connecting beam 2 to secure the cell stack 1, resulting in a stable and reliable overall structure. While meeting transportation requirements, it simplifies the structure. Moreover, each side plate segment 31 of the side plate assembly 3 is independently detachable, allowing for flexible arrangement of the side plate segments 31 according to the number of cell stacks 1. This flexible assembly improves space utilization and reduces costs. Furthermore, multiple side plate segments 31, part of the connecting beam 2, the top cover 8, and the bottom plate 7 of the side plate assembly 3 can be connected and fitted to encapsulate multiple cell stacks 1 without the need for additional components to fit with the top cover 8 and the bottom plate 7 to encapsulate the cell stacks 1. This reduces the number of components and further improves space utilization, thereby increasing the energy density of the battery pack.

[0054] 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.

[0055] 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 pack, characterized in that, The battery pack module includes a cell assembly module, a base plate, and a top cover. The cell assembly module includes: Multiple battery cell stacks are arranged along a first direction, and each battery cell stack includes multiple battery cells stacked along a second direction. Multiple connecting beams are provided at both ends of each of the cell stacks distributed along the first direction; Two side plate groups are distributed along the second direction on both sides of the cell stack. Each side plate group includes multiple side plate segments distributed along the first direction and detachably connected. The side plate segments located on both sides of the same cell stack are detachably connected to the connecting beams located at both ends of the corresponding cell stack and clamp and fix the cell stack when connected. Among them, the connecting beams that are connected to both ends of the side plate group and the side plate group are connected to form the surrounding beam of the battery pack. The top cover and the bottom plate are distributed on both sides of the cell assembly module along a third direction and are connected to the surrounding beam to form the outer shell of the battery pack.

2. The battery pack according to claim 1, characterized in that, A sealing strip is provided at the connection between two adjacent side plate segments within the same side plate group.

3. The battery pack according to claim 2, characterized in that, The side plate segment has a first connecting portion that connects to the adjacent side plate segment. The sealing strip is sandwiched between the two first connecting portions of the two adjacent side plate segments and is adapted to be squeezed and deformed when the two first connecting portions are connected and locked to the connecting beam to seal the assembly gap between the two first connecting portions.

4. The battery pack according to claim 3, characterized in that, Two connected first connecting parts are stacked along the second direction and are connected and locked to the connecting beam by a locking structure.

5. The battery pack according to claim 4, characterized in that, The locking structure includes bolts that pass through the two first connecting portions along the second direction and are connected and locked to the connecting beam.

6. The battery pack according to claim 3, characterized in that, One of the two connected first connecting parts has an L-shaped cross-section, and the other has an inverted L-shaped cross-section that fits and conforms to the L-shaped structure.

7. The battery pack according to claim 3, characterized in that, One of the two connected first connecting parts has a mounting groove on the side of the first connecting part facing the other first connecting part, and the sealing strip is installed in the mounting groove.

8. The battery pack according to claim 1, characterized in that, The base plate is welded or bolted to the surrounding beam; a sealing gasket is provided between the top cover and the surrounding beam, and the top cover and the surrounding beam are bolted together and the sealing gasket is squeezed during connection to seal the assembly gap between the top cover and the surrounding beam.

9. The battery pack according to claim 1, characterized in that, The battery cells include pouch cells.

10. The battery pack according to claim 1, characterized in that, The top cover is flat; the bottom plate is flat.

11. The battery pack according to claim 1, characterized in that, The top cover, the surrounding beam, and the bottom plate are sealed together to define an installation space for accommodating the battery cell stack, the installation space being filled with coolant that immerses the battery cell stack.

12. The battery pack according to claim 1, characterized in that, The top cover and / or the bottom plate are constructed as liquid-cooled plates.

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