Battery pack

Abstract

The utility model discloses a battery pack. The battery pack comprises a battery cell stacking body, a box body and a cooling plate, the box body comprises a bottom plate and side plates. The bottom plate is arranged at the bottoms of the side plates. And the cell stack is mounted in the mounting cavity. The cooling plate is arranged in the mounting cavity, and divides the mounting cavity into a plurality of accommodating spaces capable of accommodating the battery cell stacking bodies; and the bottom of the cooling plate is detachably connected with the bottom plate. The end face of the cooling plate is detachably connected with the inner side wall of the side plate. In the assembling process of the battery pack, the tabs of the battery cell stacking body are stacked outside the box body, the tabs of the battery cell stacking body can be welded by a plurality of welding devices at the same time, then the complete battery cell stacking body is mounted in the box body, finally the bottom of the cooling plate is connected with the bottom plate, and the end face of the cooling plate is connected with the inner side wall of the side plate. And a plurality of welding devices can be used for welding the tabs of the battery cell stacking body at the same time outside the box body, so that the production efficiency of the battery pack is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery equipment, in particular to a battery pack. Background Art

[0002] During battery pack assembly, the cold plate is welded to the box. The installation space for the cell stack is fixed. If the tabs are welded outside the box first, the complete cell stack must be placed within the installation space, and the tooling equipment must also be extended into the installation space. Due to the limited installation space within the box, the limited installation space may not accommodate the complete cell stack and tooling equipment, resulting in the cell stack being unable to be installed in the box.

[0003] Therefore, in practice, the battery cells are stacked at the bottom of the box. After the bottom layer of cells is stacked inside the box, the cells are connected in series and parallel. The second layer of cells is then stacked, followed by the series and parallel connections. This process continues until all the cells are stacked. This process occurs when some cells already occupy a certain amount of space. At this point, the gaps between stacked cells and any unfilled space can be utilized to flexibly adjust the tooling's angle and position. Furthermore, as the cells are stacked, the operating space constantly changes, allowing for dynamic adjustments based on actual conditions, allowing the tooling to find the appropriate position for tab welding.

[0004] However, battery cells are generally connected in series and parallel by laser welding, and laser welding requires operating space. After the battery cells are stacked in the box, the operating space for welding the battery cells is limited. Only one welding device can be used to weld the tabs in a battery pack, resulting in low production efficiency of the battery pack. Utility Model Content

[0005] The main purpose of the present invention is to provide a battery pack, aiming to solve the technical problem of low production efficiency of the battery pack.

[0006] In order to achieve the above-mentioned purpose of the utility model, the present utility model provides a battery pack.

[0007] A battery pack, comprising:

[0008] Battery cell stack,

[0009] A box body, the box body comprising a bottom plate and side plates, the bottom plate being arranged at the bottom of the side plates, and the bottom plate and the side plates enclosing a mounting cavity;

[0010] A cooling plate is arranged in the installation cavity and divides the installation cavity into a plurality of accommodating spaces that can accommodate the battery cell stack. The bottom of the cooling plate is detachably connected to the base plate, and the end face of the cooling plate is detachably connected to the inner wall of the side plate.

[0011] In one embodiment, the battery pack further includes a first fastener, the base plate is provided with a first mounting hole adapted to the first fastener, the bottom of the cooling plate is provided with a second mounting hole adapted to the first fastener, and the first fastener is detachably inserted into the first mounting hole and the second mounting hole in sequence.

[0012] In one embodiment, the battery pack further includes a first mounting member and a second mounting member, wherein the first mounting member is arranged on the end surface of the cooling plate facing the inner wall of the side plate, and the second mounting member is arranged on the inner wall of the side plate, and the first mounting member and the second mounting member are detachably connected.

[0013] In one embodiment, the second mounting member includes a first plate and a second plate, the first plate is connected to the second plate, and the first plate and the second plate are arranged at an angle, the first plate is attached to the inner wall of the side plate, and the second plate is attached to the first mounting member.

[0014] In one embodiment, the first plate and the second plate are arranged perpendicularly.

[0015] In one embodiment, two second plates are provided, and the two second plates are clamped on both sides of the first mounting member.

[0016] In one embodiment, the battery pack further includes a second fastener and a third fastener, a third mounting hole is defined on the first plate, a fourth mounting hole is defined on the inner sidewall of the side plate, and the second fastener is detachably inserted into the third mounting hole and the fourth mounting hole in sequence;

[0017] A fifth mounting hole is formed on the second plate body, a sixth mounting hole is formed on the first mounting member, and the third fastener is detachably inserted into the fifth mounting hole and the sixth mounting hole in sequence.

[0018] In one embodiment, a protrusion is provided on the bottom of the cooling plate, and the protrusion presses against a side of the bottom plate facing the installation cavity.

[0019] In one embodiment, the battery pack further includes a bottom guard plate, which is arranged on a side of the bottom plate facing away from the side plate.

[0020] In one embodiment, a hollow portion is provided on the bottom guard plate.

[0021] Beneficial effects:

[0022] The battery pack of the present invention comprises a housing comprising a bottom plate and side plates. The bottom plate is disposed at the bottom of the side plates, and the bottom plate and the side plates enclose a mounting cavity. The mounting cavity houses the stack of battery cells. A cooling plate is disposed within the mounting cavity. The bottom of the cooling plate is removably connected to the bottom plate. The end faces of the cooling plate are removably connected to the inner sidewalls of the side plates.

[0023] During the assembly of the battery pack, the cooling plate is separated from the casing, expanding the space inside the casing to accommodate the stack of battery cells. This creates a larger space for the stack of battery cells and tooling equipment. The cells are stacked outside the casing, and multiple welding machines can be used to weld the tabs of the stacked cells simultaneously. The complete stack of cells is then installed inside the casing, and finally the bottom of the cooling plate is connected to the bottom plate of the casing, and the end face of the cooling plate is connected to the inner wall of the side plate of the casing. During this assembly process, multiple welding machines can be used to weld the tabs of the stacked cells simultaneously outside the casing, improving the production efficiency of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is an exploded view of a battery pack in one embodiment of the present invention.

[0025] Figure 2 It is a structural schematic diagram of the side plates and the battery cell stack in one embodiment of the present invention.

[0026] Figure 3 It is a structural schematic diagram of the cooling plate and the side plate in one embodiment of the present utility model.

[0027] Figure 4 It is a structural schematic diagram of a box body in one embodiment of the present utility model.

[0028] Figure 5 It is a structural schematic diagram of the cooling plate and the side plate in one embodiment of the present utility model.

[0029] Figure 6 yes Figure 5 Magnified view of point A.

[0030] Figure 7 It is a structural schematic diagram of the cooling plate and the first mounting member in one embodiment of the present utility model.

[0031] Figure 8 It is a structural schematic diagram of a cooling plate in one embodiment of the present utility model.

[0032] in:

[0033] 100. Battery cell stack;

[0034] 200, box body; 210, bottom plate; 220, side plate;

[0035] 300, cooling plate; 310, raised portion;

[0036] 400, bottom guard plate; 410, hollow portion;

[0037] 510, first fastener; 520, first mounting hole;

[0038] 610, first mounting member; 611, sixth mounting hole; 620, second mounting member; 621, first plate; 622, second plate;

[0039] 710, second fastener; 711, third mounting hole; 720, third fastener.

[0040] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0041] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0042] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0043] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections, direct connections, or indirect connections through an intermediate medium; they may refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0044] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0045] like Figures 1 to 3 As shown, in some embodiments, a battery pack includes a cell stack 100, a housing 200, and a cooling plate 300. The housing 200 includes a bottom plate 210 and a side plate 220. The bottom plate 210 is disposed at the bottom of the side plate 220, and the bottom plate 210 and the side plate 220 enclose an installation cavity. The cell stack 100 is installed in the installation cavity. The cooling plate 300 is disposed in the installation cavity. The bottom of the cooling plate 300 is detachably connected to the bottom plate 210. The end surface of the cooling plate 300 is detachably connected to the inner side wall of the side plate 220.

[0046] During operation, the cooling plate 300 is separated from the housing 100, expanding the storage space of the battery cell stack within the housing 200. Therefore, there is a larger storage space to accommodate the battery cell stack and tooling equipment. The tabs of the battery cell stack 100 are stacked outside the housing 200, and multiple welding devices can be used to weld the tabs of the battery cell stack 100 at the same time. Then, the complete battery cell stack 100 stack is installed in the housing 200, and finally, the bottom of the cooling plate 300 is connected to the bottom plate 210, and the end face of the cooling plate 300 is connected to the inner wall of the side plate 220. Multiple welding devices can be used to weld the tabs of the battery cell stack 100 at the same time outside the housing 200, thereby improving the production efficiency of the battery pack.

[0047] In some embodiments, the box body 200 may be a square box body 200. The box body 200 is configured as an outer shell of the battery pack and protects the structure inside the box body 200.

[0048] In some embodiments, the battery pack further includes a bottom guard plate 400. The bottom guard plate 400 is disposed on a side of the bottom plate 210 facing away from the side plate 220. The bottom guard plate 400 has the same shape and size as the bottom plate 210. The bottom guard plate 400 can be completely attached to the bottom plate 210.

[0049] It should be noted that the bottom guard plate 400 provides physical protection for the bottom plate 210. During use and transportation, the battery pack may be subjected to external forces such as collision, friction, or squeezing from the bottom. The bottom guard plate 400 provides a solid protective barrier for the battery, preventing damage to the bottom of the battery. This protects the internal battery cell stack 100, tabs, and other key components from damage, ensuring the structural integrity and performance stability of the battery.

[0050] Specifically, the bottom guard plate 400 is provided with a hollow portion 410. The hollow portion 410 enhances the heat dissipation performance of the bottom guard plate 400. The hollow portion 410 increases air circulation, allowing heat from the bottom plate 210 to be better dissipated. When the battery generates heat during operation, air can pass through the hollow portion 410 to exchange heat with the bottom plate 210, improving heat dissipation efficiency, preventing battery overheating from affecting performance and lifespan, and ensuring safe and stable operation of the battery. Furthermore, the hollow portion 410 also reduces the weight of the bottom guard plate 400.

[0051] Specifically, the bottom guard plate 400 may be a square plate, and the hollow portion 410 may be arranged in a long strip shape. The long strip-shaped hollow portion 410 is arranged along the width direction of the bottom guard plate 400.

[0052] More specifically, the hollow portion 410 may be provided in plurality and arranged along the length direction of the bottom guard plate 400 .

[0053] In some embodiments, the cooling plate 300 cools and dissipates heat from the battery cell stack 100 to reduce the temperature of the battery cell stack 100 and ensure normal operation of the battery cell stack 100 .

[0054] Specifically, a protrusion 310 is provided at the bottom of the cooling plate 300. The protrusion 310 abuts against the side of the base plate 210 facing the installation cavity. It should be noted that due to the large area of ​​the base plate 210 and the difficulty in controlling the flatness, the protrusion 310 at the bottom of the cooling plate 300 can abut against the side of the base plate 210 facing the installation cavity, thereby playing a role of local support and adjustment. Even if there is a flatness problem with the base plate 210, the protrusion 310 can compensate for the unevenness of the base plate 210 to a certain extent by contacting the base plate 210, thereby ensuring better contact between the cooling plate 300 and the base plate 210.

[0055] Specifically, the cooling plate 300 may be a square plate to adapt to the square shape of the battery cell stack 100 .

[0056] Specifically, a plurality of cooling plates 300 may be provided. The plurality of cooling plates 300 are spaced apart and arranged in the installation cavity to cool and dissipate heat for the plurality of battery cell stacks 100 .

[0057] Specifically, the cooling plate 300 may be a liquid cooling plate or an air cooling plate.

[0058] like Figure 3 and Figure 4 As shown, in some embodiments, the battery pack further includes a first fastener 510. The bottom plate 210 defines a first mounting hole 520 that is compatible with the first fastener 510. The bottom of the cooling plate 300 defines a second mounting hole that is compatible with the first fastener 510. The first fastener 510 is detachably inserted through the first mounting hole 520 and the second mounting hole, respectively, to achieve a detachable connection between the bottom of the cooling plate 300 and the cooling plate 300.

[0059] Specifically, a plurality of first fasteners 510 may be provided. A plurality of first mounting holes 520 may be provided. The plurality of first mounting holes 520 are spaced apart along the length of the base plate 210. A plurality of second mounting holes may be provided. The plurality of second mounting holes may be spaced apart at the bottom of the cooling plate 300. The plurality of fasteners, the plurality of first mounting holes 520, and the plurality of second mounting holes are provided in a one-to-one correspondence to enhance the connection stability between the bottom and bottom of the cooling plate 300.

[0060] Specifically, the first fastener 510 may be a bolt or a screw. The second mounting hole and the third mounting hole 711 may be threaded holes.

[0061] like Figures 5 to 8 As shown, in some embodiments, the battery pack further includes a first mounting member 610 and a second mounting member 620. The first mounting member 610 is disposed on the end surface of the cooling plate 300 facing the inner side wall of the side plate 220, and the second mounting member 620 is disposed on the inner side wall of the side plate 220. The first mounting member 610 and the second mounting member 620 are detachably connected.

[0062] Specifically, the second mounting member 620 includes a first plate body 621 and a second plate body 622. The first plate body 621 is connected to the second plate body 622, and the first plate body 621 and the second plate body 622 are arranged at an angle. The first plate body 621 is attached to the inner wall of the side panel 220, and the second plate body 622 is attached to the first mounting member 610.

[0063] Specifically, the first plate 621 and the second plate 622 are arranged perpendicularly. That is, the second mounting member 620 can be an L-shaped angle bracket.

[0064] Specifically, two second plates 622 are provided, and the two second plates 622 are clamped on both sides of the first mounting member 610 to enhance the structural strength between the second plates 622 and the first mounting member 610 .

[0065] In some embodiments, the battery pack further includes a second fastener 710 and a third fastener 720. A third mounting hole 711 is defined on the first plate 621, and a fourth mounting hole is defined on the inner sidewall of the side panel 220. The second fastener 710 is detachably inserted into the third and fourth mounting holes, respectively. A fifth mounting hole is defined on the second plate 622, and a sixth mounting hole 611 is defined on the first mounting member 610. The third fastener 720 is detachably inserted into the fifth and sixth mounting holes, respectively.

[0066] Specifically, a plurality of second fasteners 710 can be provided. A plurality of third mounting holes 711 can be provided. A plurality of fourth mounting holes can be provided. The plurality of fasteners, the plurality of third mounting holes 711, and the plurality of fourth mounting holes are provided in a one-to-one correspondence to enhance the connection stability between the second plate 622 and the first mounting member 610.

[0067] Specifically, the second fastener 710 may be a bolt or a screw. The second mounting hole and the third mounting hole 711 may be threaded holes.

[0068] It should be noted that during the assembly of the battery pack, the battery stack 100 is first installed in the box, the L-shaped bracket is inserted between the battery stack 100 and the side panel 220, and the second fastener 710 extends from the outside of the side panel 220 and passes through the third mounting hole 711 and the fourth mounting hole to realize the installation of the L-shaped bracket and the side panel 220.

[0069] In the prior art, the cooling plate is welded to the housing. Because the battery cell stack needs to be in direct contact with the cooling plate, the flatness of the cooling plate must be maintained, and the weld bar used to weld the cooling plate needs to be as small as possible, resulting in a less secure weld. In this embodiment, the cooling plate 300 is connected to the housing 200 using first fasteners 510, second fasteners 710, and third fasteners 720, enhancing the connection strength between the cooling plate 300 and the housing 200.

[0070] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the description and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A battery pack, characterized in that: include: Battery cell stack, A box body, the box body comprising a bottom plate and side plates, the bottom plate being arranged at the bottom of the side plates, and the bottom plate and the side plates enclosing a mounting cavity; A cooling plate is arranged in the installation cavity and divides the installation cavity into a plurality of accommodating spaces that can accommodate the battery cell stack. The bottom of the cooling plate is detachably connected to the base plate, and the end face of the cooling plate is detachably connected to the inner wall of the side plate.

2. The battery pack according to claim 1, wherein: The battery pack also includes a first fastener, the base plate is provided with a first mounting hole adapted to the first fastener, the bottom of the cooling plate is provided with a second mounting hole adapted to the first fastener, and the first fastener is detachably inserted into the first mounting hole and the second mounting hole in sequence.

3. The battery pack according to claim 1, wherein: The battery pack also includes a first mounting member and a second mounting member. The first mounting member is arranged on the end surface of the cooling plate facing the inner wall of the side plate, and the second mounting member is arranged on the inner wall of the side plate. The first mounting member and the second mounting member are detachably connected.

4. The battery pack according to claim 3, wherein: The second mounting member includes a first plate and a second plate. The first plate is connected to the second plate, and the first plate and the second plate are arranged at an angle. The first plate is attached to the inner wall of the side plate, and the second plate is attached to the first mounting member.

5. The battery pack according to claim 4, characterized in that: The first plate body and the second plate body are arranged perpendicularly.

6. The battery pack according to claim 4, characterized in that: The second plate bodies are provided in two pieces, and the two second plate bodies are clamped on both sides of the first mounting member.

7. The battery pack according to claim 4, characterized in that: The battery pack further includes a second fastener and a third fastener. The first plate is provided with a third mounting hole, and the inner side wall of the side plate is provided with a fourth mounting hole. The second fastener is detachably inserted into the third mounting hole and the fourth mounting hole in sequence. A fifth mounting hole is formed on the second plate body, a sixth mounting hole is formed on the first mounting member, and the third fastener is detachably inserted into the fifth mounting hole and the sixth mounting hole in sequence.

8. The battery pack according to claim 1, wherein: A protrusion is provided on the bottom of the cooling plate, and the protrusion abuts against a side of the bottom plate facing the installation cavity.

9. The battery pack according to claim 1, wherein: The battery pack further includes a bottom guard plate, which is arranged on a side of the bottom plate facing away from the side plate.

10. The battery pack according to claim 9, characterized in that: A hollow portion is provided on the bottom guard plate.

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