Battery pack

Abstract

The utility model relates to a kind of battery pack in power battery technical field.It includes: box;Electricity core stack, it is set in box, including multiple soft package electricity core along first direction stack and two along second direction distribution's tab side;Heat-conducting structural glue, electricity core stack and the bottom plate of box are fixed by heat-conducting structural glue bonding;Foaming glue, foaming glue is filled between the tab side of electricity core stack and box;Side plate, side plate is set in box, and it is distributed in the two sides of electricity core stack along first direction, and limit structure is symmetrically equipped on the two ends of side plate along second direction distribution;Output pole busbar, output pole busbar is fixed on side plate by limit structure, and it is electrically connected with the output tab of the tab side of electricity core stack.The output pole busbar is fixed on side plate, and it is convenient to install, and it is not necessary to set plastic piece again to realize the limit and fixed of output pole busbar, and the number of parts is simplified, and space utilization is improved, and cost is reduced.

Description

Technical Field

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

[0002] With the widespread application of battery technology, the demand for battery capacity is increasing, especially in cell-to-pack (CTP) systems, where multiple cells are typically stacked together. This is usually achieved by connecting multiple stacked cells in series via an output bus, which requires a separate plastic component for installation and fixation. However, in situations where available space is limited, using a separate plastic component takes up space, resulting in low space utilization and increased costs. Utility Model Content

[0003] This utility model provides a battery pack that solves the technical problems of inconvenient fixing of the output busbar and low space utilization of the battery pack, thereby improving the energy density of the battery pack and reducing the cost.

[0004] To achieve the above and other related objectives, this utility model provides a battery pack, comprising: Box; A battery cell stack is disposed inside the housing, the battery cell stack comprising a plurality of pouch cells stacked along a first direction and two tabs distributed along a second direction; Thermally conductive structural adhesive is used to directly bond and fix the battery cell stack to the bottom plate of the housing. Expanding foam, which is filled between the tab side of the cell stack and the housing; Side plates are disposed inside the housing and distributed on both sides of the cell stack along the first direction. Limiting structures are symmetrically provided on both ends of the side plates distributed along the second direction. The output bus is fixed to the side plate by the limiting structure and is electrically connected to the output tab on the tab side of the cell stack.

[0005] In one embodiment of the present invention, the top wall and bottom wall of the side plate face the opening and bottom plate of the housing, respectively, and the output busbar is adapted to be installed into the limiting structure from top to bottom in the height direction of the side plate.

[0006] In one embodiment of the present invention, the limiting structure includes a locking block, and the output bus is provided with a locking slot corresponding to the locking block. The locking block is adapted to engage with the locking slot when the output bus is installed in place to restrict the movement of the output bus in the height direction of the side plate.

[0007] In one embodiment of the present invention, the limiting structure includes at least two first baffles distributed on both sides of the output busbar along the thickness direction of the side plate, and the at least two first baffles cooperate to restrict the movement and rotation of the output busbar in the thickness direction of the side plate.

[0008] In one embodiment of the present invention, the limiting structure further includes a second baffle. A partial bend of the first baffle forms a limiting portion that is directly opposite the end face of the side plate. The second baffle and the limiting portion are spaced apart along the height direction of the side plate and cooperate to restrict the movement and rotation of the output busbar in the length direction of the side plate.

[0009] In one embodiment of the present invention, the second baffle is L-shaped and includes a vertical section and a horizontal section connected to each other. The horizontal section is connected to the end face of the side plate and is arranged directly opposite to the lower end of the output busbar. The vertical section is arranged directly opposite to the bottom end of the side plate. The vertical section of the second baffle cooperates with the limiting part to restrict the movement and rotation of the output busbar in the length direction of the side plate.

[0010] In one embodiment of the present invention, an overflow gap is provided between the bottom wall of the side plate and the bottom plate of the box body, and the overflow gap is connected to the area where the thermally conductive structural adhesive is located.

[0011] In one embodiment of the present invention, a supporting rib is provided on the bottom wall of the side plate, the supporting rib protruding from the other wall surface of the bottom wall of the side plate, the side plate is supported on the bottom plate of the box body by the supporting rib, and the glue overflow gap is formed between the other wall surface of the bottom wall of the side plate and the bottom plate of the box body.

[0012] In one embodiment of this utility model, the supporting ribs are in line contact with the bottom plate of the box.

[0013] In one embodiment of this utility model, the supporting rib is semi-cylindrical.

[0014] The beneficial effects of this utility model are as follows: The battery pack proposed in this utility model has an output busbar connected to the output tabs of the cell stack and fixed on the side plate. The output busbar is easy to install and does not require separate plastic parts for limiting and fixing the output busbar, thus reducing the number of parts, improving space utilization, and reducing costs. Based on this, the side plate has limiting structures at both ends, allowing the output busbars connected to the output tabs on the two tab sides of the cell stack to share the side plate. This further reduces the number of parts and improves space utilization, thereby improving the energy density of the battery pack and reducing costs. In addition, the limiting structures at both ends of the side plate improve the versatility of the side plate. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0016] In the attached diagram: Figure 1 This is a schematic diagram of the battery pack provided in Embodiment 1 of this utility model; Figure 2 An exploded view of a partial structure of the battery pack provided in Embodiment 2 of this utility model; Figure 3 for Figure 2 A magnified schematic diagram of part A in the middle; Figure 4 A side view of a partial structure of the battery pack provided in Embodiment 2 of this utility model; Figure 5 for Figure 4 Sectional view at point BB; Figure 6 for Figure 4 Sectional view at CC; Figure 7 for Figure 4 Front view of the middle side panel; Figure 8 This is a schematic diagram of the side panel of the battery pack provided in Embodiment 3 of this utility model; Figure 9 for Figure 8 A magnified schematic diagram of part D in the middle.

[0017] The attached figures are labeled as follows: 1. Housing, 11. Base plate, 2. Cell stack, 21. Soft-pack cell, 21. Electrode, 211. Output electrode, 2111. Foam, 3. Side plate, 4. Limiting structure, 41. Locking block, 411. Second baffle, 412. Vertical section, 4121. Horizontal section, 4122. First baffle, 413. Limiting part, 4131. Supporting rib, 42. Other wall surfaces, 43. Housing cover, 5. Output busbar, 6. Slot, 61. Thermally conductive structural adhesive, 7. Lowest surface, 71. Detailed Implementation

[0018] The following specific examples 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. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0019] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0020] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0021] Please see Figure 1 and Figure 2In some optional embodiments, the present invention provides a battery pack, which includes a housing 1, a cell stack 2, a thermally conductive structural adhesive 7, a foam adhesive 3, a side plate 4, and an output busbar 6; in addition to the above-mentioned components, the battery pack may also include a cover 5. The housing 1 has a bottom plate 11 and a box opening opposite to the bottom plate 11. The cell stack 2 is disposed inside the housing 1 and is adapted to be inserted into the housing 1 through the box opening and installed inside the housing 1. The cover 5 is distributed along the height direction of the cell stack 2 and the housing 1. The cover 5 is located above the cell stack 2 and seals the box opening to encapsulate the cell stack 2 inside the housing 1. The cell stack 2 includes multiple pouch cells 21 stacked along a first direction and two tab sides distributed along a second direction. Each pouch cell 21 has tabs 211 located on the tab side of the cell stack 2. Some tabs 211 of the pouch cells 21 are formed as connecting tabs, and adjacent pouch cells 21 are electrically connected in series via these connecting tabs. Some tabs 211 of some pouch cells 21 are formed as output tabs 2111 to enable external output from the cell stack 2. The cell stack 2 is bonded to the base plate 11 of the housing 1 using thermally conductive structural adhesive 7. Specifically, the cell stack 2 and the base plate 11 of the housing 1 can be directly bonded using thermally conductive structural adhesive 7. Foam 3 is filled between the tab side of the cell stack 2 and the housing 1 to achieve connection between the tab side of the cell stack 2 and the housing 1. Side plates 4 are disposed inside the housing 1 and distributed on both sides of the cell stack 2 along the first direction. Limiting structures 41 are symmetrically provided on both ends of the side plates 4 distributed along the second direction. The output bus 6 is fixed to the side plates 4 by the limiting structures 41 and is electrically connected to the output tabs 2111 on the tab side of the cell stack 2.

[0022] Optionally, there may be multiple cell stacks 2, and adjacent cell stacks 2 may be electrically connected through the output bus 6 to achieve series connection between cell stacks 2.

[0023] Optionally, output bus 6 includes a copper bar.

[0024] In the battery pack of the above embodiment, the output busbar 6 is fixed to the side plate 4 by the limiting structure 41. The side plate 4 can be used directly to limit and fix the output busbar 6, which is convenient for installation and eliminates the need for separate plastic parts to fix the output busbar 6. This reduces the number of parts, saves space, and improves space utilization, thereby helping to increase the energy density of the battery pack and reduce costs. In addition, the limiting structures 41 are symmetrically provided at both ends of the side plate 4, that is, the two ends of the side plate 2 are symmetrically arranged, or the structures at both ends of the side plate 2 are exactly the same. On the one hand, the output busbars 6 located on the two tab sides of the cell stack 2 can share the side plate 4, which helps to further improve space utilization. On the other hand, the symmetrical structure at both ends of the side plate 4 means that two side plates 4 with the same structure can be used on both sides of the cell stack 2, which increases the versatility of the side plate 4. Moreover, the two side plates 4 can be manufactured using the same mold, which helps to further reduce costs.

[0025] See Figures 2 to 7 In some optional embodiments, the top and bottom walls of the side plate 4 face the opening of the housing 1 and the bottom plate 11, respectively. In the height direction of the side plate 4, the output busbar 6 is adapted to be installed into the limiting structure 41 from top to bottom. The operation is simple, and the limiting and fixing of the output busbar 6 can be achieved without hot riveting or other steps, effectively reducing the number of parts and lowering costs. The height direction of the side plate 4 is the third direction.

[0026] Optionally, the limiting structure 41 includes a locking block 411, and the output bus 6 is provided with a locking groove 61 corresponding to the locking block 411. The locking block 411 is adapted to engage with the locking groove 61 when the output bus 6 is installed in place to limit the movement of the output bus 6 in the height direction of the side plate 4. Specifically, during the process of inserting the output bus 6 into the limiting structure 41, the bottom sidewall of the output bus 6 acts on the locking block 411, causing the locking block 411 to undergo elastic deformation. When the locking groove 61 of the output bus 6 is aligned with the locking block 411, the force exerted by the output bus 6 on the locking block 411 disappears, and the locking block 411 returns to its original deformation and engages with the locking groove 61.

[0027] Optionally, the limiting structure 41 includes at least two first baffles 413 distributed along the thickness direction of the side plate 4 on both sides of the output bus 6. The at least two first baffles 413 cooperate to restrict the movement and rotation of the output bus 6 in the thickness direction of the side plate 4. The rotation of the output bus 6 in the thickness direction of the side plate 4 is a rotation about the X direction. Further, there are two first baffles 413, which are arranged opposite each other and extend along the height direction of the side plate 4, effectively restricting the movement and rotation of the output bus 6 in the Y direction.

[0028] Optionally, the limiting structure 41 further includes a second baffle 412. A partial bend in the first baffle 413 forms a limiting portion 4131 that is directly opposite the end face of the side plate 4. The second baffle 412 and the limiting portion 4131 are spaced apart along the height direction of the side plate 4, and cooperate to limit the movement and rotation of the output busbar 6 in the length direction of the side plate 4. The rotation of the output busbar 6 in the length direction of the side plate 4 is a rotation about the Y direction. Furthermore, the limiting portion 4131 formed by the partial bend of one of the two directly opposite first baffles 413 is connected to the other first baffle 413, which helps to improve the stability of the limiting structure 41.

[0029] Optionally, the second baffle 412 is L-shaped, including a vertical section 4121 and a horizontal section 4122 connected together. The horizontal section 4122 is connected to the end face of the side plate 4 and is arranged directly opposite to the bottom end of the output bus 6. The bottom end of the output bus 6 can abut against the horizontal section 4122 to limit and position the output bus 6 in the Z direction. The vertical section 4121 is arranged directly opposite to the end face of the side plate 4, and the vertical section 4121 cooperates with the limiting part 4131 to limit the movement and rotation of the output bus 6 in the length direction of the side plate 4. Furthermore, the limiting part 4131 blocks the upper part of the output bus 6, and the vertical section 4121 of the second baffle 412 blocks the lower part of the output bus 6, ensuring the limiting effect while also helping to reduce the number of parts.

[0030] It should be noted that in this utility model, the width direction of the cell stack 2, the stacking direction of the multiple soft-pack cells 21 in the same cell stack 2, the thickness direction of the soft-pack cells 21, the thickness direction of the side plate 4 and the first direction are the same, that is, the Y direction in the figure; the length direction of the cell stack 2, the distribution direction of the two tab sides of the cell stack 2, the length direction of the soft-pack cells 21, the length direction of the side plate 4 and the second direction are the same, that is, the X direction in the figure; the height direction of the cell stack 2, the height direction of the soft-pack cells 21, the height direction of the side plate 4 and the third direction are the same, that is, the Z direction in the figure.

[0031] The battery pack in the above embodiment fixes the output busbar 6 to the side plate 4 through the limiting structure 41. The structure is simple and easy to assemble, which helps to improve space utilization and reduce costs.

[0032] See Figure 8 and Figure 9 In some alternative embodiments, the limiting part 4131 formed by the partial bending of one of the two opposing first baffles 413 is not connected to the other first baffle 413, so that the limiting part 4131 has a certain elastic deformation space, which facilitates the insertion of the output bus 6 into the limiting structure 41.

[0033] See Figures 1 to 7 In some optional embodiments, an overflow gap is provided between the bottom wall of the side plate 4 and the bottom plate 11 of the box body 1, and the overflow gap is connected to the area where the thermally conductive structural adhesive 7 is located.

[0034] Optionally, the bottom wall of the side panel 4 is provided with a supporting rib 42, which protrudes beyond the remaining wall surface 43 of the bottom wall of the side panel 4. The side panel 4 is supported on the bottom plate 11 of the housing 1 by the supporting rib 42, and an overflow gap is formed between the remaining wall surface 43 of the bottom wall of the side panel 4 and the bottom plate 11 of the housing 1. The supporting rib 42 raises the height of the remaining wall surface 43 of the bottom wall of the side panel 4, which helps to increase the overflow space at the bottom of the side panel 4.

[0035] Optionally, the support rib 42 and the bottom plate 11 of the housing 1 are in line contact, with a small contact area. This helps to prevent the thermally conductive structural adhesive 7 from accumulating on the contact area between the support rib 42 and the bottom plate 11 of the housing 1, so that the side plate 4 can make proper contact with the bottom plate 11 of the housing 1, thereby helping to avoid affecting the installation and positioning of the side plate 4 in the Z direction.

[0036] Optionally, the support rib 42 is semi-cylindrical, or in other words, the cross-section of the support rib 42 in the Z direction is semi-circular, and the length direction of the support rib 42 is the same as the thickness direction of the side plate 4.

[0037] Optionally, the remaining wall surface 43 of the bottom wall of the side plate 4 is higher than the lowest surface 71 of the thermally conductive structural adhesive 7 and lower than the highest surface of the thermally conductive structural adhesive 7.

[0038] In the battery pack of the above embodiment, by setting an overflow gap, when the filling amount of thermally conductive structural adhesive 7 exceeds the rated value, the overflow gap can provide space for the thermally conductive structural adhesive 7 to overflow, avoiding the excess thermally conductive structural adhesive 7 having nowhere to overflow, which would cause the thermally conductive structural adhesive 7 between the cell stack 2 and the bottom plate 11 of the housing 1 to be too thick. This is beneficial to avoid affecting the heat conduction effect and to avoid affecting the installation of other components inside the housing 1.

[0039] The battery pack of this utility model has limiting structures 41 at both ends of the side plate 4 to fix the output busbar 6 on the side plate 4. The limiting and fixing of the output busbar 6 is simple and convenient, reducing the number of parts and improving space utilization, thereby improving the energy density and product performance of the battery pack.

[0040] 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: Box; A battery cell stack is disposed inside the housing, the battery cell stack comprising a plurality of pouch cells stacked along a first direction and two tabs distributed along a second direction; Thermally conductive structural adhesive is used to directly bond and fix the battery cell stack to the bottom plate of the housing. Expanding foam, which is filled between the tab side of the cell stack and the housing; Side plates are disposed inside the housing and distributed on both sides of the cell stack along the first direction. Limiting structures are symmetrically provided on both ends of the side plates distributed along the second direction. The output bus is fixed to the side plate by the limiting structure and is electrically connected to the output tab on the tab side of the cell stack.

2. The battery pack according to claim 1, characterized in that, The top and bottom walls of the side plate face the opening and bottom plate of the housing, respectively. In the height direction of the side plate, the output busbar is adapted to be installed into the limiting structure from top to bottom.

3. The battery pack according to claim 2, characterized in that, The limiting structure includes a locking block, and the output bus is provided with a locking slot corresponding to the locking block. The locking block is adapted to engage with the locking slot when the output bus is installed in place to restrict the movement of the output bus in the height direction of the side plate.

4. The battery pack according to claim 2, characterized in that, The limiting structure includes at least two first baffles distributed on both sides of the output busbar along the thickness direction of the side plate, and the at least two first baffles cooperate to restrict the movement and rotation of the output busbar in the thickness direction of the side plate.

5. The battery pack according to claim 4, characterized in that, The limiting structure further includes a second baffle. A partial bend of the first baffle forms a limiting portion that is directly opposite the end face of the side plate. The second baffle and the limiting portion are spaced apart along the height direction of the side plate and cooperate to restrict the movement and rotation of the output busbar in the length direction of the side plate.

6. The battery pack according to claim 5, characterized in that, The second baffle is L-shaped and includes a vertical section and a horizontal section connected to each other. The horizontal section is connected to the end face of the side plate and is arranged opposite to the bottom end of the output busbar. The vertical section is arranged opposite to the end face of the side plate. The vertical section cooperates with the limiting part to restrict the movement and rotation of the output busbar in the length direction of the side plate.

7. The battery pack according to claim 1, characterized in that, An overflow gap is provided between the bottom wall of the side panel and the bottom plate of the box body, and the overflow gap is connected to the area where the thermally conductive structural adhesive is located.

8. The battery pack according to claim 7, characterized in that, The bottom wall of the side panel is provided with a supporting rib, which protrudes from the rest of the bottom wall of the side panel. The side panel is supported on the bottom plate of the box body by the supporting rib, and the glue overflow gap is formed between the rest of the bottom wall of the side panel and the bottom plate of the box body.

9. The battery pack according to claim 8, characterized in that, The supporting ribs are in line contact with the bottom plate of the box.

10. The battery pack according to claim 9, characterized in that, The supporting ribs are semi-cylindrical.

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