Battery pack

Abstract

The utility model belongs to a battery pack in the technical field of power batteries. Comprising a box body comprising a lower shell; the battery core stacking body is arranged in the lower shell, and the battery core stacking body is provided with a tab side on which a tab is arranged; the polystyrene foam, a part of a gap between the tab side of the battery cell stacking body and the lower shell form a glue filling port, and the polystyrene foam is filled and connected between the tab side of the battery cell stacking body and the lower shell; the sampling assembly comprises a low-voltage sampling element and an insulating connecting piece, the fixed end of the insulating connecting piece is fixed on the battery cell stacking body, the movable end of the insulating connecting piece is detachably connected with the connecting end of the low-voltage sampling element, and the movable end of the insulating connecting piece can be bent to avoid the glue filling port when being separated from the connecting end of the low-voltage sampling element; and the sampling end of the low-voltage sampling element is connected with the tab of the battery cell stack. The insulating connecting sheet is provided with the movable end which can be bent and is detachably connected with the low-voltage sampling element, so that a glue filling position can be reserved for filling polystyrene foam, and the production difficulty can be 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] As battery applications become more widespread, the safety requirements for battery packs are also increasing. This is typically achieved by sampling the cell stack using sampling components to monitor its condition. Currently, during assembly, after the sampling component is assembled with the cell stack, adhesive is applied to the tabs of the cell stack. Since the sampling component is generally fixed to the cell stack as a whole, the adhesive application can interfere with parts of the sampling component's structure, making operation inconvenient and negatively impacting production efficiency and product quality. 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 that solves the problem of inconvenient glue filling operation at the tabs of the cell stack in the prior art, so as to reduce production difficulty and improve production efficiency and product quality.

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

[0005] The housing includes a lower shell;

[0006] A battery cell stack comprising a plurality of pouch cells, the battery cell stack being disposed within the lower housing, the battery cell stack having a tab side for mounting tabs;

[0007] Foaming adhesive, a portion of the gap between the tab side of the battery cell stack and the lower housing is formed as a filling port, the foaming adhesive is adapted to enter the lower housing from the filling port and fill the gap between the tab side of the battery cell stack and the lower housing;

[0008] The sampling assembly includes a low-voltage sampling element and an insulating connecting piece. The fixed end of the insulating connecting piece is fixed to the cell stack, and the movable end of the insulating connecting piece is detachably connected to the connection end of the low-voltage sampling element. The movable end of the insulating connecting piece can be bent to avoid the potting port when it is disengaged from the connection end of the low-voltage sampling element. The sampling end of the low-voltage sampling element is connected to the tab of the cell stack.

[0009] Optionally, there are multiple battery cell stacks, and the multiple battery cell stacks are arranged along a first direction; the lower housing includes multiple connecting beams, and the two sides of the battery cell stacks distributed along the first direction are electrode tab sides, and each battery cell stack has a connecting beam arranged on its electrode tab side, and the foam adhesive fills and connects the electrode tab side of the battery cell stack and the connecting beam.

[0010] Optionally, the plurality of pouch cells in each cell stack are stacked along a second direction. The lower housing further includes two side plate groups, which are distributed on both sides of the cell stack along the second direction. Each side plate group includes a plurality of 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 beam located on the tab side of the corresponding cell stack and clamp and fix the cell stack during connection.

[0011] Optionally, the movable end of the insulating connecting piece is snapped and fixed to the connecting end of the low-voltage sampling element.

[0012] Optionally, the movable end of the insulating connecting piece can be bent and detachably connected to the fixed end of the insulating connecting piece when it is disconnected from the connection end of the low-voltage sampling element, and the movable end of the insulating connecting piece avoids the glue-filling port when it is connected to the fixed end of the insulating connecting piece.

[0013] Optionally, the movable end of the insulating connecting piece is engaged and fixed with the fixed end of the insulating connecting piece.

[0014] Optionally, the lower housing includes a base plate, the cell stack has a top side facing away from the base plate, and the fixed end of the insulating connecting piece is fixed to the top side of the cell stack; when the movable end of the insulating connecting piece is connected to the fixed end of the insulating connecting piece, the movable end of the insulating connecting piece is located on the top side of the cell stack; when the movable end of the insulating connecting piece is connected to the connection end of the low-voltage sampling element, at least a portion of the movable end of the insulating connecting piece is located on the tab side of the cell stack.

[0015] Optionally, when the movable end of the insulating connecting piece is connected to the connection end of the low-voltage sampling element, the insulating connecting piece has an L-shaped structure; when the movable end of the insulating connecting piece is connected to the fixed end of the insulating connecting piece, the insulating connecting piece has a U-shaped structure.

[0016] Optionally, the fixed end of the insulating connecting piece is bonded or snapped to the battery cell stack.

[0017] Optionally, the insulating connecting piece may comprise a polycarbonate sheet or a polyethylene terephthalate sheet.

[0018] Optionally, the low-voltage sampling element includes a flexible circuit board.

[0019] As described above, the battery pack of this utility model has at least the following beneficial effects: the insulating connecting piece has a movable end that can be bent and detachably connected to the low-voltage sampling element, so that the insulating connecting piece can provide support for the low-voltage sampling element when connected to it, so that the low-voltage sampling element is more stably connected to the tab, and can also be bent to avoid the glue filling port when detached from the low-voltage sampling element, so as to make room for the glue filling position, so as to fill the foaming glue. This helps to avoid interference between the foaming glue and the insulating connecting piece when it is filled from the glue filling port, thereby helping to reduce production difficulty, improve production efficiency and product quality. Attached Figure Description

[0020] Figure 1 This is a partial structural diagram of the connection between the insulating connecting piece and the low-voltage sampling element in one embodiment of the battery pack of this utility model;

[0021] Figure 2 for Figure 1 Top view of the battery pack;

[0022] Figure 3 for Figure 1 A partial cross-sectional view of the battery pack;

[0023] Figure 4 for Figure 3 A magnified schematic diagram of part A in the middle;

[0024] Figure 5 for Figure 1 A partial structural diagram of the battery pack when the insulating connecting piece detaches from the low-voltage sampling element;

[0025] Figure 6 for Figure 5 Top view of the battery pack;

[0026] Figure 7 for Figure 5 A partial cross-sectional view of the battery pack;

[0027] Figure 8 for Figure 7 A magnified schematic diagram of part B in the middle.

[0028] Part Number Explanation

[0029] 1. Cell stack 11. Soft-pack cell 2. Connecting beam 2. Side plate assembly 3. Side plate segment 31. Low-voltage sampling element 41. Second snap-fit ​​part 411. Insulating connecting piece 42. Fixed end 421. Fourth snap-fit ​​part 4211. Movable end 422. First snap-fit ​​part 4221. Third snap-fit ​​part 4222. Foam 5. Base plate 6. Glue inlet 7. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] See Figure 1 and Figure 5 In some optional embodiments, this utility model provides a battery pack, including a housing, a cell stack 1, expanding foam 5, and a sampling assembly. The housing includes a lower shell, and the cell stack 1 includes a plurality of pouch cells 11. The cell stack 1 is disposed within the lower shell and has a tab side with tabs. A portion of the gap between the tab side of the cell stack 1 and the lower shell forms a filling port 7, and the expanding foam 5 is adapted to enter the lower shell through the filling port 7 and fill the gap between the tab side of the cell stack 1 and the lower shell. The sampling assembly includes a low-voltage sampling element 41 and an insulating connecting piece 42. The low-voltage sampling element 41 has a sampling end and a connecting end. The sampling end of the low-voltage sampling element 41 is connected to the tab of the cell stack 1. The insulating connecting piece 42 has a fixed end 421 and a movable end 422. The fixed end 421 of the insulating connecting piece 42 is fixed on the cell stack 1. The movable end 422 of the insulating connecting piece 42 is detachably connected to the connecting end of the low-voltage sampling element 41. When the movable end 422 of the insulating connecting piece 42 is disconnected from the connecting end of the low-voltage sampling element 41, it can be bent to avoid the glue inlet 7.

[0033] Optionally, there are multiple battery cell stacks 1, which are arranged along a first direction. The lower housing includes multiple connecting beams 2 distributed along the first direction. The two sides of the battery cell stacks 1 distributed along the first direction are electrode tabs. That is, electrode tabs are provided on both sides of the battery cell stacks 1 distributed along the first direction. Each battery cell stack 1 has a connecting beam 2 arranged on its electrode tab side. Foam 5 is filled and connected between the electrode tab side of the battery cell stack 1 and the connecting beam 2.

[0034] Optionally, multiple soft-pack cells 11 of each cell stack 1 are stacked along a second direction. The lower housing also includes two side plate assemblies 3, which 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 a 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 on the tab side 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 connected to each other to provide a pre-tightening force to fix the cell stack 1, which helps to prevent the cell stack 1 from falling off and scattering. The side plate assembly 3 includes multiple independently set side plate segments 31. The side plate segments 31 can be detachably connected to each other and to the connecting beams 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. Furthermore, the side plate section 31 and the connecting beam 2 can be locked together by bolts, making disassembly and assembly simple and convenient, and ensuring a firm and reliable connection.

[0035] Optionally, the side panel section 31 can be made of aluminum profile, injection molded part or die casting.

[0036] In this invention, the first direction and the second direction are perpendicular. Specifically, the arrangement direction of the multiple 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 cell stack 1, and the length direction of the cells are the same as the first direction, i.e., the X direction in the figures. The arrangement direction of the multiple soft-pack cells 11 in each cell stack 1, the length direction of the connecting beams 2, the width direction of the cell stack 1, the thickness direction of the cells, and the second direction are the same, i.e., the Y direction in the figures.

[0037] Optionally, the fixing end 421 of the insulating connecting piece 42 is bonded or snapped to the battery cell stack 1, ensuring reliable connection and simple and convenient operation.

[0038] Optionally, the insulating connecting piece 42 may be a polycarbonate (PC) sheet or a polyethylene terephthalate (PET) sheet.

[0039] Optionally, the low-voltage sampling element 41 includes a flexible printed circuit (FPC). The low-voltage sampling element 41 is welded and fixed to the tabs of the cell stack 1. The low-voltage sampling element 41 can sample the voltage of the pouch cell 11 in order to monitor the status of the pouch cell 11 in real time.

[0040] Optionally, multiple side plate segments 31 of the same side plate group 3 correspond one-to-one with multiple battery cell stacks 1. That is, each battery cell stack 1 has a side plate segment 31 arranged on each side along the second direction, making assembly simple and flexible.

[0041] Optionally, the connecting beam 2 has a gap with the tab side of the cell stack 1. That is, the length of the side plate segment 31 is greater than the length of the cell stack 1, so that the connecting beam 2 does not contact the tab side of the cell stack 1. This helps to avoid squeezing the tab side and affecting the performance of the cell stack 1, and also helps to ensure the insulation effect. The side plate segments 31 located on both sides of the same cell stack 1 cooperate to clamp and fix the cell stack 1 along the second direction. The two sides of the soft-pack cell 11 distributed along the second direction are the sides with the largest surface area of ​​the soft-pack cell 11. The cooperation of the two side plate segments 31 to clamp the sides with the largest surface area of ​​the soft-pack cell 11 helps to improve the stability of the overall structure.

[0042] In the battery pack of the above embodiment, the movable end 422 of the insulating connecting piece 42 can be moved to change position so as to avoid the glue filling port 7 and make room for glue filling. This helps to avoid interference with the insulating connecting piece 42 during the filling of foam 5, making the filling operation of foam 5 more convenient, reducing production difficulty, and improving production efficiency and product quality.

[0043] See Figures 1 to 4 In some alternative embodiments, the movable end 422 of the insulating connecting piece 42 is snapped and fixed to the connecting end of the low-voltage sampling element 41.

[0044] Optionally, the movable end 422 of the insulating connecting piece 42 is provided with a first snap-fit ​​portion 4221, and the connecting end of the low-voltage sampling element 41 is provided with a second snap-fit ​​portion 411 that snaps into the first snap-fit ​​portion 4221. Further, the first snap-fit ​​portion 4221 includes a slot, and the second snap-fit ​​portion 411 includes a locking block that is adapted to the slot.

[0045] In the battery pack of the above embodiment, the connection between the movable end 422 of the insulating connecting piece 42 and the low-voltage sampling element 41 is simple and easy to disassemble and assemble, allowing the insulating connecting piece 42 to switch between different positions to meet assembly requirements. Specifically, before the low-voltage sampling element 41 is welded to the tab, the overall structure of the insulating connecting piece 42 has a certain rigidity. When the insulating connecting piece 42 is connected to the low-voltage sampling element 41, it can provide reliable support for the low-voltage sampling element 41, preventing the low-voltage sampling element 41 from shaking easily, thus facilitating the welding of the low-voltage sampling element 41 to the tab. After the low-voltage sampling element 41 is welded to the tab, the movable end 422 of the insulating connecting piece 42 is detached from the low-voltage sampling element 41 and bent to avoid the glue inlet 7, thus avoiding the glue filling position at the tab, facilitating glue filling and reducing the operational difficulty of the glue filling process. After that, the movable end 422 can be reset.

[0046] See Figures 4 to 8 In some alternative embodiments, the movable end 422 of the insulating connecting piece 42 can be bent and detachably connected to the fixed end 421 of the insulating connecting piece 42 when it is disconnected from the connection end of the low-voltage sampling element 41, and the movable end 422 of the insulating connecting piece 42 avoids the glue-filling port 7 when it is connected to the fixed end 421 of the insulating connecting piece 42.

[0047] Optionally, the movable end 422 of the insulating connecting piece 42 is snapped into and fixed to the fixed end 421 of the insulating connecting piece 42, which is simple to connect and easy to assemble and disassemble. Furthermore, after being bent, the movable end 422 of the insulating connecting piece 42 is located above the fixed end 421 of the insulating connecting piece 42 and is snapped into and fixed to the fixed end 421 of the insulating connecting piece 42.

[0048] Optionally, the movable end 422 of the insulating connecting piece 42 is provided with a third engaging portion 4222, and the fixed end 421 of the insulating connecting piece 42 is provided with a fourth engaging portion 4211 adapted to engage with the third engaging portion 4222. Further, the third engaging portion 4222 includes a slot, and the fourth engaging portion 4211 includes a locking block adapted to the slot.

[0049] Optionally, the lower housing includes a base plate 6, and the cell stack 1 has a top side facing away from the base plate 6 and a bottom side facing the base plate 6. The top and bottom sides of the cell stack 1 are distributed along a third direction, and the fixed end 421 of the insulating connecting piece 42 is fixed to the top side of the cell stack 1. When the movable end 422 of the insulating connecting piece 42 is connected to the fixed end 421 of the insulating connecting piece 42, the movable end 422 of the insulating connecting piece 42 is located on the top side of the cell stack 1; when the movable end 422 of the insulating connecting piece 42 is connected to the connection end of the low-voltage sampling element 41, at least a portion of the movable end 422 of the insulating connecting piece 42 is located on the tab side of the cell stack 1. Further, when the movable end 422 of the insulating connecting piece 42 is connected to the connection end of the low-voltage sampling element 41, the insulating connecting piece 42 has an L-shaped structure; when the movable end 422 of the insulating connecting piece 42 is connected to the fixed end 421 of the insulating connecting piece 42, the insulating connecting piece 42 has a U-shaped structure. The fixed end 421 of the insulating connecting piece 42 is fixed on the top side of the cell stack 1, which is convenient for assembly. Moreover, the top side of the cell stack 1 where the fixed end 421 of the insulating connecting piece 42 is located is different from the tab side of the cell stack 1. This allows the movable end 422 of the insulating connecting piece 42 to completely avoid the tab side of the cell stack 1 when connected to the fixed end 421 of the insulating connecting piece 42. This helps to avoid the glue-filling position of the tab and reduce the impact on the glue-filling operation.

[0050] In this utility model, the height direction of the cell stack 1, the height direction of the connecting beam 2, the height direction of the side plate section 31, the height direction of the soft-pack cell 11 and the third direction are the same, namely the Z direction in the figure.

[0051] In the battery pack of the above embodiment, the movable end 422 of the insulating connecting piece 42 is detachably connected to the fixed end 421 of the insulating connecting piece 42, so that the movable end 422 of the insulating connecting piece 42 can switch between different states to change its position. The connection between the movable end 422 of the insulating connecting piece 42 and the fixed end 421 of the insulating connecting piece 42 keeps the movable end 422 of the insulating connecting piece 42 away from the glue inlet 7. There is no need to provide shaping support for the movable end 422 of the insulating connecting piece 42 through other parts, which helps to reduce interference with other components, has a compact layout, and helps to improve space utilization and product quality.

[0052] During assembly, the side plate section 31 of the side plate assembly 3 is connected to the connecting beam 2 to clamp and fix the corresponding cell stack 1. The fixed end 421 of the insulating connecting piece 42 is fixed to the cell stack 1, and the movable end 422 of the insulating connecting piece 42 is connected to the connecting end of the low-voltage sampling element 41. The sampling end of the low-voltage sampling element 41 is welded and fixed to the electrode tab of the cell stack 1. The assembled cell stack 1, sampling assembly, side plate assembly 3, and connecting beam 2 are transferred to the base plate 6. 3 and / or connect and fix the connecting beam 2 to the base plate 6, detach the movable end 422 of the insulating connecting piece 42 from the low-voltage sampling element 41, and connect it to the fixed end 421 to make room for the glue filling port 7. Fill the lower housing with expanding foam 5 through the glue filling port 7, so that the expanding foam 5 fills and connects the electrode tab side of the cell stack 1 and between the connecting beam 2 and the lower housing. After the glue filling is completed, connect the movable end 422 of the insulating connecting piece 42 to the low-voltage sampling element 41, install the top cover, and complete the final assembly.

[0053] In the battery pack of this utility model, the movable end 422 of the insulating connecting piece 42 is detachably connected to the low-voltage sampling element 41, and the movable end 422 of the insulating connecting piece 42 can be bent to change its position. It can be connected to the low-voltage sampling element 41 to support the low-voltage sampling element 41, and it can also be separated from the low-voltage sampling element 41 and avoid the glue filling port 7 to avoid the glue filling position of the electrode tab. This helps to reduce the operational difficulty of the assembly process and improve production efficiency and product quality.

[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, include: The housing includes a lower shell; A battery cell stack comprising a plurality of pouch cells, the battery cell stack being disposed within the lower housing, the battery cell stack having a tab side for mounting tabs; Foaming adhesive, a portion of the gap between the tab side of the battery cell stack and the lower housing is formed as a filling port, the foaming adhesive is adapted to enter the lower housing from the filling port and fill the gap between the tab side of the battery cell stack and the lower housing; The sampling assembly includes a low-voltage sampling element and an insulating connecting piece. The fixed end of the insulating connecting piece is fixed to the cell stack, and the movable end of the insulating connecting piece is detachably connected to the connection end of the low-voltage sampling element. The movable end of the insulating connecting piece can be bent to avoid the potting port when it is disengaged from the connection end of the low-voltage sampling element. The sampling end of the low-voltage sampling element is connected to the tab of the cell stack.

2. The battery pack according to claim 1, characterized in that, The number of battery cell stacks is multiple, and the multiple battery cell stacks are arranged along a first direction; the lower housing includes multiple connecting beams, and the two sides of the battery cell stacks distributed along the first direction are electrode tab sides. Each battery cell stack has a connecting beam arranged on its electrode tab side, and the foam adhesive fills and connects the electrode tab side of the battery cell stack and the connecting beam.

3. The battery pack according to claim 2, characterized in that, The plurality of pouch cells in each cell stack are stacked along a second direction. The lower housing also includes two side plate groups, which are distributed on both sides of the cell stack along the second direction. Each side plate group includes a plurality of 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 beam located on the tab side of the corresponding cell stack and clamp and fix the cell stack when connected.

4. The battery pack according to claim 1, characterized in that, The movable end of the insulating connecting piece is snapped and fixed to the connecting end of the low-voltage sampling element.

5. The battery pack according to claim 1, characterized in that, The movable end of the insulating connecting piece can be bent and detachably connected to the fixed end of the insulating connecting piece when it is disconnected from the connection end of the low-voltage sampling element, and the movable end of the insulating connecting piece avoids the glue-filling port when it is connected to the fixed end of the insulating connecting piece.

6. The battery pack according to claim 5, characterized in that, The movable end of the insulating connecting piece is engaged and fixed with the fixed end of the insulating connecting piece.

7. The battery pack according to claim 5, characterized in that, The lower housing includes a base plate, the battery cell stack has a top side facing away from the base plate, and the fixed end of the insulating connecting piece is fixed to the top side of the battery cell stack; when the movable end of the insulating connecting piece is connected to the fixed end of the insulating connecting piece, the movable end of the insulating connecting piece is located on the top side of the battery cell stack; when the movable end of the insulating connecting piece is connected to the connection end of the low-voltage sampling element, at least a portion of the movable end of the insulating connecting piece is located on the tab side of the battery cell stack.

8. The battery pack according to any one of claims 5 to 7, characterized in that, When the movable end of the insulating connecting piece is connected to the connection end of the low-voltage sampling element, the insulating connecting piece has an L-shaped structure; when the movable end of the insulating connecting piece is connected to the fixed end of the insulating connecting piece, the insulating connecting piece has a U-shaped structure.

9. The battery pack according to claim 1, characterized in that, The fixed end of the insulating connecting piece is bonded or snapped to the battery cell stack.

10. The battery pack according to claim 1, characterized in that, The insulating connecting piece includes a polycarbonate plate or a polyethylene terephthalate plate.

11. The battery pack according to claim 1, characterized in that, The low-voltage sampling element includes a flexible circuit board.

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