Battery pack and electric device

Abstract

This application provides a battery pack and an electrical device. The battery pack includes a casing, a circuit board, and a cell module. The casing includes a first housing, a front cover, and two side plates. The first housing includes a first wall, a second wall, a bottom plate, and a limiting plate connected sequentially. The bottom plate and the second wall are arranged along a first direction, and the limiting plate and the first wall are arranged along a second direction. Along the second direction, the front cover is detachably connected to the side of the first housing opposite to the first wall and spaced apart from the limiting plate. Along a third direction, the two side plates are detachably connected to both sides of the first housing. The first, second, and third directions are perpendicular to each other. The cell module is disposed between the limiting plate and the first wall, and the cell module includes multiple cells arranged along the second direction. One end of the bottom plate has a latching portion that protrudes away from the cell module along the second direction. The projection of the latching portion is located within the projection of the cell module. The first wall has a latching opening, and the latching portion latches into the latching opening.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery pack and an electrical device. Background Technology

[0002] Batteries are widely used in electronic devices, electric vehicles, electric two-wheelers, power tools, and other fields. As a power source, batteries play an irreplaceable and vital role. With increasing demands for battery safety and performance, battery packs contain battery cells and typically include circuit boards that manage cell performance. However, during the later stages of battery pack use, maintenance of the circuit boards is necessary to ensure performance and reliability. Existing battery packs often present significant challenges in disassembling and reassembling these circuit boards for maintenance, hindering subsequent upkeep. Summary of the Invention

[0003] In view of the above problems, this application provides a battery pack and electrical equipment that can effectively reduce the difficulty of subsequent maintenance of the battery pack.

[0004] In a first aspect, this application provides a battery pack, including a casing, a circuit board, and a battery cell module; the casing includes a first housing, a front cover, and two side plates; the first housing includes a main body, a bottom plate, and a limiting plate; the main body has a first wall and a second wall connected to each other, the first wall being connected to one end of the bottom plate; the bottom plate and the second wall are spaced apart along a first direction; the limiting plate is fixedly connected to the second wall and the bottom plate, and spaced apart from the first wall along a second direction; along the second direction, the front cover is detachably connected to the side of the first housing opposite to the first wall, and spaced apart from the limiting plate ... first wall; along the second direction, the front cover is detachably connected to the side of the first housing opposite to the first wall, and spaced apart from the first wall; along the second direction, the front cover is detachably connected to the side of the first housing opposite to the first wall, and spaced apart from the first wall; along the second direction, the front cover is detachably connected to the side of the first housing opposite to the first wall, and space In three directions, the two side plates are detachably connected to the two sides of the first housing, and the first direction, the second direction, and the third direction are perpendicular to each other; the circuit board is disposed between the limiting plate and the front cover; the battery cell module is disposed between the limiting plate and the first wall, and the battery cell module includes a plurality of battery cells arranged along the second direction; wherein, one end of the bottom plate is provided with a snap-fit ​​part, and along the second direction, the snap-fit ​​part protrudes away from the battery cell module, and the projection of the snap-fit ​​part is located within the projection of the battery cell module; the first wall is provided with a snap-fit ​​opening, and the snap-fit ​​part snaps into the snap-fit ​​opening.

[0005] In the above technical solution, the battery pack outer shell is provided with a first shell, a front cover and two side plates. The first shell is provided with a first wall and a limiting plate arranged along a second direction. The front cover and the two side plates are detachably connected to the first shell, and the front cover, the limiting plate and the first wall are arranged sequentially and spaced apart along the second direction, so that the cell module can be set between the first wall and the limiting plate and the circuit board can be set between the limiting plate and the front cover. With this structure, the circuit board can be maintained after the front cover and the two side plates are removed, which is beneficial to the disassembly and assembly of the battery pack and reduces the difficulty of subsequent maintenance of the battery pack. After the front cover and the two side plates are removed, the first wall and the limiting plate of the first shell can still maintain the constraint force of the multiple cells arranged along the second direction, thereby alleviating the phenomenon that the outer shell cannot be reinstalled after the expansion of the cells loses its constraint. Furthermore, by providing a snap-fit ​​part at one end of the base plate and a corresponding snap-fit ​​opening on the first wall for the snap-fit ​​part to snap into, the first wall is prevented from detaching from the base plate. The projection of the snap-fit ​​part in the second direction is located within the cell module. This battery pack structure can, on the one hand, improve the connection strength between the area of ​​the first wall corresponding to the cell and the base plate, which is beneficial to improving the constraint effect of the first wall on the cell module and reducing the phenomenon of detachment due to excessive expansion force on the area of ​​the first wall corresponding to the cell, thereby reducing the risk of deformation of the first wall and effectively improving the service life of the battery pack. On the other hand, the structure of snap-fit ​​part and snap-fit ​​opening interlocking to connect the first wall and the base plate, with the snap-fit ​​part protruding away from the cell module, can reduce the damage to the cell and reduce the risk of the cell module being punctured by the snap-fit ​​part, thus improving the safety of the battery pack.

[0006] In some embodiments, a connecting portion is formed at one end of the base plate, the first wall is located on the side of the connecting portion away from the battery cell module, and the snap-fit ​​portion protrudes from the side of the connecting portion away from the battery cell module.

[0007] In the above technical solution, a connecting part is also formed at one end of the base plate, and the snap-fit ​​part and the first wall are both set on the side of the connecting part away from the cell module. This structure can increase the area of ​​the base plate for setting the snap-fit ​​part, which is beneficial to improve the structural strength and structural stability between the snap-fit ​​part and the base plate. On the other hand, the connecting part can separate the snap-fit ​​part and the cell module to reduce the damage caused by the snap-fit ​​part to the cell of the cell module.

[0008] In some embodiments, the latching portion includes a first latching segment and a second latching segment connected to each other along the second direction, the second latching segment being connected to the base plate through the first latching segment; along the second direction, the projected area of ​​the second latching segment is larger than the projected area of ​​the first latching segment, the first latching segment is disposed at the latching opening, and the second latching segment abuts against the side of the first wall away from the battery cell module.

[0009] In the above technical solution, the snap-fit ​​part has a first snap-fit ​​segment and a second snap-fit ​​segment connected sequentially in the second direction. The first snap-fit ​​segment is connected to the base plate. In the second direction, by setting the projected area of ​​the second snap-fit ​​segment to be larger than the projected area of ​​the first snap-fit ​​segment, the second snap-fit ​​segment can abut against the side of the first wall away from the battery cell module after the first snap-fit ​​segment is placed in the snap-fit ​​opening, thereby realizing the snap-fit ​​between the base plate and the first wall. The snap-fit ​​part with this structure can effectively improve the snap-fit ​​effect between the base plate and the first wall, which is conducive to alleviating the phenomenon of the first wall and the base plate separating due to poor snap-fit ​​effect, and is also conducive to reducing the snap-fit ​​difficulty between the first wall and the base plate, thereby reducing the assembly difficulty between the first wall and the base plate.

[0010] In some embodiments, the snap-fit ​​opening includes a first snap-fit ​​opening and a second snap-fit ​​opening, both the first snap-fit ​​opening and the second snap-fit ​​opening penetrating the first wall along the second direction, and the first snap-fit ​​opening and the second snap-fit ​​opening communicating with each other; the first snap-fit ​​segment is disposed at the first snap-fit ​​opening, and along the second direction, the projected area of ​​the second snap-fit ​​segment is greater than the projected area of ​​the first snap-fit ​​opening and smaller than the projected area of ​​the second snap-fit ​​opening.

[0011] In the above technical solution, the snap-fit ​​opening includes a first snap-fit ​​opening and a second snap-fit ​​opening arranged and connected to each other on the first wall. Along the second direction, the projected area of ​​the second snap-fit ​​segment is larger than the projected area of ​​the first snap-fit ​​opening and smaller than the projected area of ​​the second snap-fit ​​opening. That is, the aperture of the first snap-fit ​​opening is smaller than the aperture of the second snap-fit ​​opening. The second snap-fit ​​segment can pass through the second snap-fit ​​opening but cannot pass through the first snap-fit ​​opening. This allows the second snap-fit ​​segment to abut against the side of the first wall away from the battery cell module by translating the snap-fit ​​part into the first snap-fit ​​opening after the second snap-fit ​​segment passes through the second snap-fit ​​opening, thereby achieving a snap-fit ​​connection between the first wall and the base plate. The structure is simple, easy to operate, and has high connection strength.

[0012] In some embodiments, the first snap-fit ​​opening and the second snap-fit ​​opening are arranged along the third direction.

[0013] In the above technical solution, by setting the first snap-fit ​​opening and the second snap-fit ​​opening as a structure arranged along a third direction, after the second snap-fit ​​segment of the snap-fit ​​part passes through the second snap-fit ​​opening, the first snap-fit ​​segment of the snap-fit ​​part can be switched within the first snap-fit ​​opening and the second snap-fit ​​opening simply by moving the first wall along a third direction, thereby realizing the snap-fit ​​or de-snap-fit ​​between the first wall and the base plate, which helps to reduce the difficulty of disassembling and assembling the first wall and the base plate.

[0014] In some embodiments, the base plate is provided with a plurality of the latching portions, which are spaced apart along the third direction, and the latching openings are provided in one-to-one correspondence with the latching portions.

[0015] In the above technical solution, by setting multiple snap-fit ​​parts on the base plate and correspondingly setting multiple snap-fit ​​openings on the first wall, it is beneficial to further improve the connection strength between the area of ​​the first wall corresponding to the battery cell and the base plate, so as to improve the constraint effect of the first wall on the battery cell module, and reduce the phenomenon of falling off due to excessive expansion force on the area of ​​the first wall corresponding to the battery cell, thereby reducing the risk of deformation of the first wall and effectively improving the service life of the battery pack.

[0016] In some embodiments, the first wall is provided with a first opening, and the bottom plate is provided with a second opening; the battery pack further includes a first fastener, which is disposed at the first opening and the second opening in a direction opposite to the second direction to fasten the first wall and the bottom plate; along the second direction, the projection of the first fastener is separate from the projection of the cell module.

[0017] In the above technical solution, a first fastener is also provided between the first wall and the base plate. The first fastener is provided in the first opening and the second opening along the second direction to fasten the first wall and the base plate, thereby further improving the connection strength and connection stability between the first wall and the base plate. Furthermore, by setting the projection of the first fastener in the second direction to be separate from the projection of the cell module in the second direction, that is, the projection of the first fastener in the second direction and the projection of the cell module in the second direction do not overlap, the connection strength between the first wall and the base plate can be improved while effectively mitigating the risk of the first fastener puncturing the cell of the cell module, thereby improving the safety and service life of the battery pack.

[0018] In some embodiments, the battery pack includes at least two first fasteners, and the first opening and the second opening are respectively disposed in a one-to-one correspondence with the first fasteners; the at least two first fasteners are respectively located at both ends of the first wall in the first direction; along the third direction, the snap-fit ​​portion is located between the two first fasteners.

[0019] In the above technical solution, the battery pack is provided with at least two first fasteners, and the at least two first fasteners are respectively provided on both sides of the snap-fit ​​part in the third direction. This allows the first fasteners and the snap-fit ​​part to cooperate with each other to improve the connection strength between the area of ​​the first wall corresponding to the battery cell and the base plate, as well as the connection strength between the area of ​​the first wall not corresponding to the battery cell and the base plate. This further improves the connection strength between the first wall as a whole and the base plate, thereby further reducing the risk of the first wall falling off or deforming due to the expansion of the battery cell during use.

[0020] In some embodiments, a gap is formed between the battery cell module and the side plate along the third direction; along the second direction, the projection of the first fastener is located within the gap.

[0021] In the above technical solution, by setting the battery cell module and the side plate at a distance in the third direction, a gap is formed between the battery cell module and the side plate, thereby setting the projection of the first fastener in the second direction to be located within the gap, so that the projection of the first fastener in the second direction is separate from the projection of the battery cell module in the second direction.

[0022] In some embodiments, a handle is provided on the side plate, the handle protruding from the side of the side plate facing the cell module, and the handle is located within the gap.

[0023] In the above technical solution, a handle is also provided on the side plate for the operator to move the battery pack. By setting the handle to protrude from the side plate facing the cell module and located in the gap, the gap formed between the cell module and the side plate can be better utilized to improve the internal space utilization of the battery pack. Moreover, it is not necessary to set the handle to be an outward protruding structure, which is conducive to optimizing the space occupied by the battery pack.

[0024] In some embodiments, the base plate is provided with two limiting portions, and the battery cell module is located between the two limiting portions along the third direction.

[0025] In the above technical solution, by providing two limiting parts spaced apart along a third direction on the base plate, and with the two limiting parts located on both sides of the cell module, the two limiting parts can play a certain limiting role on the cell module, thereby helping to alleviate the phenomenon of the cell module moving along a third direction inside the casing. This can effectively reduce the risk of damage to the cell module caused by collision with the side plate or scratching with the first fastener, thereby improving the safety and service life of the battery pack.

[0026] In some embodiments, the first wall and the second wall are integrally formed.

[0027] In the above technical solution, by setting the first wall and the second wall of the main body as an integral structure, it is beneficial to improve the overall structural strength of the main body, so as to further enhance the constraint effect of the first wall of the main body on the expansion of the battery cell.

[0028] In some embodiments, the base plate is provided with a positioning protrusion, and the limiting plate is provided with a positioning hole that mates with the positioning protrusion, the positioning hole being used for the positioning protrusion to be inserted.

[0029] In the above technical solution, by setting a positioning protrusion on the base plate and a corresponding positioning hole on the limiting plate for the positioning protrusion to be inserted, the positioning between the limiting plate and the base plate can be realized, which is beneficial to improving the assembly accuracy of the limiting plate on the base plate. In addition, the positioning protrusion can also limit the limiting plate in the second direction, so as to alleviate the phenomenon that the limiting plate has a poor constraint effect on the expansion of the battery cell due to the slippage of the limiting plate.

[0030] In some embodiments, the front cover is bolted to the first housing by a second fastener bolt; and / or, the side panel is bolted to the first housing by a third fastener.

[0031] In the above technical solution, the front cover is detachably connected to the first housing by a structure screwed onto the first housing using a second fastener. This structure is simple and easy to assemble and disassemble, which helps reduce the difficulty of subsequent battery pack maintenance. Similarly, the side panel is detachably connected to the first housing by a structure screwed onto the first housing using a third fastener. This structure is simple and easy to assemble and disassemble, which also helps reduce the difficulty of subsequent battery pack maintenance.

[0032] Secondly, this application also provides an electrical device including the aforementioned battery pack. Attached Figure Description

[0033] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings.

[0034] Figure 1 This is a schematic diagram of the structure of a battery pack provided in some embodiments of this application;

[0035] Figure 2 Exploded views of the battery pack structure provided in some embodiments of this application;

[0036] Figure 3 This is a schematic diagram of the structure of a portion of the battery pack provided in some embodiments of this application;

[0037] Figure 4 This is a schematic diagram of the structure of a portion of the housing provided in some embodiments of this application;

[0038] Figure 5 for Figure 4 A partial enlarged view of point A in the first housing shown;

[0039] Figure 6 This is a schematic diagram of the structure of a battery cell module provided in some embodiments of this application;

[0040] Figure 7 Exploded views of the structure of a portion of the housing provided in some embodiments of this application;

[0041] Figure 8 for Figure 7 A partial enlarged view of point B in the first housing shown;

[0042] Figure 9 for Figure 7 A partial enlarged view of point C in the first housing shown;

[0043] Figure 10 A reverse structural view of a portion of the battery pack structure provided in some embodiments of this application, along a first direction;

[0044] Figure 11 A schematic diagram of the structure of the base plate of the first housing provided in some embodiments of this application.

[0045] Icons: 100-Battery pack; 10-Outer shell; 11-First shell; 111-Main body; 1111-First wall; 1111a-First opening; 1112-Second wall; 1113-Snap-fit ​​opening; 1113a-First snap-fit ​​opening; 1113b-Second snap-fit ​​opening; 112-Base plate; 1121-Snap-fit ​​part; 1121a-First snap-fit ​​section; 1121b-Second snap-fit ​​section; 1122-Connecting part; 1122a-Second opening; 1123-Limiting part; 1124-Positioning protrusion; 113-Limiting plate; 114-First fastener; 12-Front cover; 13-Side plate; 131-Handle; 20-Circuit board; 30-Cell module; 31-Cell; 32-Busseter component; 40-Gap; X-First direction; Y-Second direction; Z-Third direction. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0047] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the specification of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and foregoing drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or foregoing drawings of this application are used to distinguish different objects, rather than to describe a specific order or hierarchy.

[0048] In the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0049] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0050] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0051] In this application, the thickness tolerance is within 3°. For example, if β = 90°, considering the potential errors during the manufacturing or measurement process, 90° ± 3° should be considered within the protection scope of this application. Similarly, parallelism and perpendicularity in this application should be understood as approximately parallel.

[0052] In this application, "multiple" means two or more (including two).

[0053] In this application, the battery cell can be a lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., and the embodiments of this application are not limited to this.

[0054] A battery cell consists of electrode assemblies and an electrolyte. The electrode assemblies are composed of a positive electrode, a negative electrode, and a separator. The cell primarily functions by the movement of metal ions between the positive and negative electrodes. The positive electrode includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The portion of the positive current collector without the coating serves as the positive electrode tab, or a positive electrode tab is welded to the surface of the uncoated current collector to allow for the input or output of electrical energy. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary materials, or lithium manganese oxide, etc. The negative electrode includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The portion of the negative current collector without the negative active material layer serves as the negative electrode tab, or a negative electrode tab is welded to the surface of the current collector without the negative active material layer, so that the negative electrode can input or output electrical energy through the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc.

[0055] The separator can be made of polypropylene (PP) or polyethylene (PE), etc. Furthermore, the electrode assembly can be a wound structure or a stacked structure; this application does not limit the specific type.

[0056] The inventors discovered that, for a typical battery pack, the battery pack usually includes a casing and a circuit board and battery cell modules housed within the casing. The battery cells consist of multiple cells arranged in a stacked configuration within the casing. The circuit board manages the battery cells. During subsequent use of the battery pack, to ensure its performance and safety, maintenance of the circuit board is usually required. However, in existing battery packs, maintaining the circuit board requires disassembling the entire casing, which is difficult and complicates maintenance. Furthermore, the battery cells expand during cyclic charging and discharging, making it easy for the expanded cells to lose the pre-tightening force of the casing after disassembly. This can easily lead to the casing being unable to be reassembled after disassembly, further complicating subsequent battery pack maintenance and hindering its long-term maintenance.

[0057] Based on the above considerations, and to address the issue of difficult subsequent maintenance of battery packs, the inventors, after in-depth research, designed a battery pack comprising a casing, a circuit board, and a cell module. The casing includes a first housing, a front cover, and two side plates. The first housing includes a main body, a bottom plate, and a limiting plate. The main body has a first wall and a second wall connected to each other. The first wall is connected to one end of the bottom plate. The bottom plate and the second wall are spaced apart along a first direction. The limiting plate is fixedly connected to the second wall and the bottom plate, and is spaced apart from the first wall along a second direction. Along the second direction, the front cover is detachably connected to the side of the first housing opposite to the first wall, and is spaced apart from the limiting plate. Along a third direction, the two side plates are detachably connected to both sides of the first housing. The first, second, and third directions are perpendicular to each other. The circuit board is disposed between the limiting plate and the front cover. The cell module is disposed between the limiting plate and the first wall, and the cell module includes multiple cells arranged along the second direction. One end of the base plate is provided with a snap-fit ​​part. Along the second direction, the snap-fit ​​part protrudes away from the battery cell module. The projection of the snap-fit ​​part is located within the projection of the battery cell module. The first wall is provided with a snap-fit ​​opening. The snap-fit ​​part snaps into the snap-fit ​​opening to prevent the first wall from detaching from the base plate.

[0058] In this battery pack structure, the outer casing includes a first housing, a front cover, and two side plates. The first housing has a first wall and a limiting plate arranged along a second direction. The front cover and the two side plates are detachably connected to the first housing. The front cover, the limiting plate, and the first wall are arranged sequentially and spaced apart along the second direction, allowing the battery cell module to be placed between the first wall and the limiting plate, and the circuit board to be placed between the limiting plate and the front cover. With this battery pack structure, the circuit board can be maintained after the front cover and the two side plates are removed, which makes the disassembly and assembly of the battery pack easier and reduces the difficulty of subsequent maintenance. After removing the front cover and the two side plates, the first wall and the limiting plate of the first housing can still maintain the constraint force of the multiple battery cells arranged along the second direction, thereby alleviating the phenomenon that the outer casing cannot be reinstalled after the battery cells expand and lose their constraint.

[0059] Furthermore, by providing a snap-fit ​​part at one end of the base plate and a corresponding snap-fit ​​opening on the first wall for the snap-fit ​​part to snap into, the first wall is prevented from detaching from the base plate. The projection of the snap-fit ​​part in the second direction is located within the cell module. This battery pack structure can, on the one hand, improve the connection strength between the area of ​​the first wall corresponding to the cell and the base plate, which is beneficial to improving the constraint effect of the first wall on the cell module and reducing the phenomenon of detachment due to excessive expansion force on the area of ​​the first wall corresponding to the cell, thereby reducing the risk of deformation of the first wall and effectively improving the service life of the battery pack. On the other hand, the structure of snap-fit ​​part and snap-fit ​​opening interlocking to connect the first wall and the base plate, with the snap-fit ​​part protruding away from the cell module, can reduce the damage to the cell and reduce the risk of the cell module being punctured by the snap-fit ​​part, thus improving the safety of the battery pack.

[0060] This application provides an electrical device or energy storage device that uses a battery pack as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc.

[0061] According to some embodiments of this application, refer to Figures 1-5 , Figure 1 This is a schematic diagram of the structure of the battery pack 100 provided in some embodiments of this application. Figure 2 This is an exploded view of the structure of a battery pack 100 provided in some embodiments of this application. Figure 3 This is a schematic diagram of the structure of a portion of the battery pack 100 provided in some embodiments of this application. Figure 4 This is a schematic diagram of the structure of a portion of the outer casing 10 provided in some embodiments of this application. Figure 5 for Figure 4The image shows a partial enlarged view of point A on the first housing 11. This application provides a battery pack 100, which includes a housing 10, a circuit board 20, and a cell module 30. The housing 10 includes a first housing 11, a front cover 12, and two side plates 13. The first housing 11 includes a main body 111, a bottom plate 112, and a limiting plate 113. The main body 111 has a first wall 1111 and a second wall 1112 connected to each other. The first wall 1111 is connected to one end of the bottom plate 112. The bottom plate 112 and the second wall 1112 are spaced apart along a first direction X. The limiting plate 113 is fixedly connected to the second wall 1112 and the bottom plate 112, and is spaced apart from the first wall 1111 along a second direction Y. Along the second direction Y, the front cover 12 is detachably connected to the side of the first housing 11 opposite to the first wall 1111, and is spaced apart from the limiting plate 113. Along the third direction Z, two side plates 13 are detachably connected to both sides of the first housing 11, with the first direction X, the second direction Y, and the third direction Z being perpendicular to each other. The circuit board 20 is disposed between the limiting plate 113 and the front cover 12. The battery module 30 is disposed between the limiting plate 113 and the first wall 1111, and the battery module 30 includes a plurality of battery cells 31 arranged along the second direction Y. One end of the base plate 112 is provided with a snap-fit ​​part 1121. Along the second direction Y, the snap-fit ​​part 1121 protrudes away from the cell module 30. The projection of the snap-fit ​​part 1121 is located within the projection of the cell module 30. The first wall 1111 is provided with a snap-fit ​​opening 1113. The snap-fit ​​part 1121 snaps into the snap-fit ​​opening 1113 to restrict the first wall 1111 from detaching from the base plate 112.

[0062] The outer casing 10 of the battery pack 100 includes a first housing 11, a front cover 12, and two side plates 13. The first housing 11 has a first wall 1111 and a limiting plate 113 arranged along the second direction Y. The front cover 12 and the two side plates 13 are detachably connected to the first housing 11. The front cover 12, the limiting plate 113, and the first wall 1111 are arranged at intervals along the second direction Y, so that the cell module 30 can be disposed between the first wall 1111 and the limiting plate 113, and the circuit board 20 can be disposed between the limiting plate 113 and the front cover. Between 12, the battery pack 100 with this structure allows for maintenance of the circuit board 20 after the front cover 12 and the two side plates 13 are removed. This makes the disassembly and assembly of the battery pack 100 easier and reduces the difficulty of subsequent maintenance. After removing the front cover 12 and the two side plates 13, the first wall 1111 and the limiting plate 113 of the first housing 11 can still maintain the constraint force of the multiple cells 31 arranged along the second direction Y. This can alleviate the phenomenon that the housing 10 cannot be reinstalled after the expansion of the cells 31 loses its constraint.

[0063] By providing a snap-fit ​​portion 1121 at one end of the base plate 112 and a snap-fit ​​opening 1113 corresponding to the snap-fit ​​portion 1121 on the first wall 1111, the first wall 1111 is restricted from detaching from the base plate 112. Furthermore, the projection of the snap-fit ​​portion 1121 in the second direction Y is located within the cell module 30. This structure of the battery pack 100 improves the connection strength between the area of ​​the first wall 1111 corresponding to the cell 31 and the base plate 112, thereby enhancing the constraint effect of the first wall 1111 on the cell module 30 and reducing the risk of injury. The expansion force on the core 31 area is too large, which may cause it to fall off. This reduces the risk of deformation of the first wall 1111, thereby effectively improving the service life of the battery pack 100. On the other hand, the first wall 1111 and the base plate 112 are connected by a structure in which the snap-fit ​​part 1121 and the snap-fit ​​opening 1113 snap-fit ​​each other. The snap-fit ​​part 1121 protrudes away from the cell module 30, which can reduce the damage to the cell 31. This helps to reduce the risk of the cell 31 of the cell module 30 being punctured by the snap-fit ​​part 1121, and helps to improve the safety of the battery pack 100.

[0064] The outer casing 10 provides assembly space for the battery cell module 30. The outer casing 10 can adopt various structures, such as a cuboid structure or a cylindrical structure. For example, in... Figure 1 In the middle, the outer shell 10 has a cuboid structure.

[0065] exist Figure 4 In the first housing 11, there are a main body 111, a bottom plate 112, and a limiting plate 113. The main body 111 has a first wall 1111 and a second wall 1112 connected to each other. The first wall 1111 is connected to one end of the bottom plate 112. The second wall 1112 and the bottom plate 112 are spaced apart along a first direction X. The limiting plate 113 is fixedly connected to the second wall 1112 and the bottom plate 112, and is spaced apart from the first wall 1111 along a second direction Y. The first wall 1111, the bottom plate 112, the limiting plate 113, and the second wall 1112 of the first housing 11 are connected in sequence and enclosed to form an annular structure. The battery cell module 30 is disposed in the first housing 11, and the multiple battery cells 31 of the battery cell module 30 are arranged along the second direction Y between the first wall 1111 and the limiting plate 113.

[0066] The main body 111 has a first wall 1111 and a second wall 1112 that are interconnected. The first wall 1111 and the second wall 1112 are perpendicular to each other. The first wall 1111 and the second wall 1112 can be a separate structure or a one-piece structure. When the first wall 1111 and the second wall 1112 are separate structures, they can be connected by welding, snap-fitting, or bolting. When the first wall 1111 and the second wall 1112 are a one-piece structure, they can be formed by stamping or casting. For example, in... Figure 4 In the middle, the first wall 1111 and the second wall 1112 are an integral structure.

[0067] By setting the first wall 1111 and the second wall 1112 of the main body 111 as an integral structure, it is beneficial to improve the overall structural strength of the main body 111, so as to further enhance the constraint effect of the first wall 1111 of the main body 111 on the expansion of the cell 31.

[0068] The limiting plate 113 is disposed between the second wall 1112 and the bottom plate 112 along the first direction X. The fixing connection between the limiting plate 113 and the second wall 1112 and the bottom plate 112 can be in various ways, such as bolt connection, snap-fit, or welding. For example, in the embodiment of this application, the limiting plate 113 is bolted to the second wall 1112 and snap-fitted to the second wall 1112.

[0069] The front cover 12 is detachably connected to the side of the first housing 11 opposite to the first wall 1111, and is spaced apart from the limiting plate 113. The front cover 12 is connected in the second direction Y to the end of the bottom plate 112 and the second wall 1112 away from the first wall 1111, and the front cover 12 is spaced apart from the limiting plate 113 so that the circuit board 20 can be disposed between the front cover 12 and the limiting plate 113. Optionally, the circuit board 20 can be mounted on the front cover 12 or on the limiting plate 113. For example, in... Figure 2 In this configuration, circuit board 20 is mounted on the front cover 12. It should be noted that circuit board 20 manages the battery cell module 30. Circuit board 20 needs to be electrically connected to multiple battery cells 31 in the battery cell module 30 to manage and monitor the usage status of the battery cells 31. Therefore, the connection cable between circuit board 20 and the battery cells 31 is located in the Z-direction between the side plate 13 and the battery cell module 30. The specific structure of circuit board 20 can be found in relevant technical documents and will not be elaborated upon here.

[0070] Optionally, the detachable connection structure between the front cover 12 and the first housing 11 can be of various types, such as bolted connection, snap-fit ​​connection, etc. Similarly, the detachable connection structure between the side plate 13 and the first housing 11 can also be of various types, such as bolted connection, snap-fit ​​connection, etc.

[0071] In the battery cell module 30, the battery cell module 30 includes a plurality of battery cells 31 arranged along the second direction Y. The plurality of battery cells 31 can be connected in series, in parallel, or in a mixed manner. A mixed manner means that the plurality of battery cells 31 are connected in both series and parallel. The plurality of battery cells 31 can be directly connected in series, in parallel, or in a mixed manner, and then the battery cell module 30 composed of the plurality of battery cells 31 is housed in the outer casing 10.

[0072] Please refer to Figure 6 , Figure 6 This is a schematic diagram of the structure of a battery cell module 30 provided in some embodiments of this application. The battery cell module 30 may also include other structures. For example, the battery cell module 30 may also include a busbar component 32, which is electrically connected to a plurality of battery cells 31 to realize electrical connection between the plurality of battery cells 31.

[0073] Each cell 31 can be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The cell 31 can be cylindrical, flat, cuboid, or other shapes. For example, in... Figure 6 In the middle, the battery cell 31 has a cuboid structure, with the thickness direction of the battery cell 31 in the second direction Y and the length direction of the battery cell 31 in the third direction Z.

[0074] According to some embodiments of this application, refer to Figure 5 Please refer to further details. Figure 7 and Figure 8 , Figure 7 Exploded views of a portion of the outer casing 10 provided in some embodiments of this application. Figure 8 for Figure 7 A partial enlarged view of point B on the first housing 11 shown. Along the second direction Y, the snap-fit ​​portion 1121 protrudes from one end of the base plate 112 away from the battery cell module 30.

[0075] Along the second direction Y, the projection of the snap-fit ​​part 1121 is located within the projection of the cell module 30. The position where the snap-fit ​​part 1121 is provided on the bottom plate 112 and snaps into the first wall 1111 corresponds to the position of the cell module 30.

[0076] Optionally, the structure in which the snap-fit ​​portion 1121 and the snap-fit ​​opening 1113 snap together can be varied. For example, the snap-fit ​​portion 1121 and the snap-fit ​​opening 1113 can be press-fitted together to achieve snap-fit ​​of the snap-fit ​​portion 1121 into the snap-fit ​​opening 1113. Alternatively, the wall of the snap-fit ​​opening 1113 can be provided with a groove for snap-fitting the snap-fit ​​portion 1121 to achieve snap-fit ​​of the snap-fit ​​portion 1121 into the snap-fit ​​opening 1113. For example, in Figure 5 In the middle, the snap-fit ​​part 1121 passes through the snap-fit ​​opening 1113 and abuts against the side of the first wall 1111 away from the battery cell module 30, so as to realize that the snap-fit ​​part 1121 snaps into the snap-fit ​​opening 1113.

[0077] It should be noted that the snap-fit ​​part 1121 can be an integral structure with the base plate 112, for example, formed by an integral molding process such as stamping or casting, or it can be a separate structure, for example, the snap-fit ​​part 1121 is connected to the base plate 112 by welding or bonding.

[0078] By positioning the latching portion 1121 at one end of the base plate 112 in the second direction Y and protruding it away from the cell module 30, the risk of the latching portion 1121 puncturing the cell 31 of the cell module 30 is reduced, thereby improving the safety of the battery pack 100.

[0079] In some embodiments, please continue to see Figure 5 , Figure 7 and Figure 8 As shown, a connecting portion 1122 is formed at one end of the base plate 112, and a first wall 1111 is located on the side of the connecting portion 1122 away from the cell module 30. A snap-fit ​​portion 1121 protrudes from the side of the connecting portion 1122 away from the cell module 30.

[0080] The connecting portion 1122 formed on the base plate 112 is a flanged portion formed by a flanged process on the base plate 112, and the connecting portion 1122 and the cell module 30 are arranged along the second direction Y, such that the snap-fit ​​portion 1121 and the first wall 1111 are both located on the side of the connecting portion 1122 away from the cell module 30. Of course, in other embodiments, the connecting portion 1122 can also be a component connected to the base plate 112 by processes such as welding.

[0081] One end of the base plate 112 is also formed with a connecting portion 1122, and the snap-fit ​​portion 1121 and the first wall 1111 are both provided on the side of the connecting portion 1122 away from the cell module 30. This structure can increase the area of ​​the base plate 112 for setting the snap-fit ​​portion 1121, which is beneficial to improve the structural strength and structural stability between the snap-fit ​​portion 1121 and the base plate 112. On the other hand, the connecting portion 1122 can separate the snap-fit ​​portion 1121 and the cell module 30, so as to reduce the damage caused by the snap-fit ​​portion 1121 to the cell 31 of the cell module 30.

[0082] According to some embodiments of this application, see Figure 5 and Figure 8As shown, the latching portion 1121 includes a first latching segment 1121a and a second latching segment 1121b connected to each other along the second direction Y. The second latching segment 1121b is connected to the base plate 112 through the first latching segment 1121a. Along the second direction Y, the projected area of ​​the second latching segment 1121b is larger than the projected area of ​​the first latching segment 1121a. The first latching segment 1121a is disposed at the latching opening 1113, and the second latching segment 1121b abuts against the side of the first wall 1111 away from the cell module 30 to restrict the first wall 1111 from detaching from the base plate 112.

[0083] The latching part 1121 has a first latching segment 1121a and a second latching segment 1121b connected sequentially in the second direction Y. The first latching segment 1121a is connected to the base plate 112. In the second direction Y, by setting the projected area of ​​the second latching segment 1121b to be larger than the projected area of ​​the first latching segment 1121a, after the first latching segment 1121a is provided in the latching opening 1113, the second latching segment 1121b can abut against the first wall 1111 and move away from it. On one side of the cell module 30, the base plate 112 and the first wall 1111 are snapped together. The snap-fit ​​part 1121 with this structure can effectively improve the snap-fit ​​effect between the base plate 112 and the first wall 1111, which helps to alleviate the phenomenon of the first wall 1111 and the base plate 112 separating due to poor snap-fit ​​effect, and also helps to reduce the snap-fit ​​difficulty between the first wall 1111 and the base plate 112, so as to reduce the assembly difficulty between the first wall 1111 and the base plate 112.

[0084] Along the second direction Y, the projected area of ​​the second latching segment 1121b is larger than the projected area of ​​the first latching segment 1121a, so that the size of the second latching segment 1121b of the latching part 1121 is larger than the size of the first latching segment 1121a. This allows the second latching segment 1121b to abut against the side of the first wall 1111 away from the battery cell module 30 after the first latching part 1121 is inserted into the latching opening 1113, thereby preventing the first wall 1111 from detaching from the base plate 112.

[0085] In the above embodiments, the structure of the snap-fit ​​opening 1113 can be various. For example, the snap-fit ​​opening 1113 can be a notch provided on the edge of the first wall 1111. The first snap-fit ​​segment 1121a of the snap-fit ​​part 1121 can move through the edge of the first wall 1111 into the snap-fit ​​opening 1113 so that the second snap-fit ​​segment 1121b can abut against the side of the first wall 1111 away from the cell module 30. The snap-fit ​​opening 1113 can also be composed of multiple through holes of different sizes arranged on the first wall 1111, and the multiple through holes are interconnected. This allows the second snap-fit ​​segment 1121b of the snap-fit ​​part 1121 to pass through the larger of the multiple through holes along the second direction Y, and then the first snap-fit ​​segment 1121a of the snap-fit ​​part 1121 can be translated into the smaller of the multiple through holes so that the second snap-fit ​​segment 1121b can abut against the side of the first wall 1111 away from the cell module 30.

[0086] According to some embodiments of this application, refer to Figure 5 , Figure 7 and Figure 8 Please refer to further details. Figure 9 , Figure 9 for Figure 7 The diagram shows a partial enlarged view of point C on the first housing 11. The snap-fit ​​opening 1113 includes a first snap-fit ​​opening 1113a and a second snap-fit ​​opening 1113b. Both the first snap-fit ​​opening 1113a and the second snap-fit ​​opening 1113b penetrate the first wall 1111 along the second direction Y. The first snap-fit ​​opening 1113a and the second snap-fit ​​opening 1113b are arranged perpendicular to the second direction Y and are interconnected. A first snap-fit ​​segment 1121a is provided at the first snap-fit ​​opening 1113a. Along the second direction Y, the projected area of ​​the second snap-fit ​​segment 1121b is larger than the projected area of ​​the first snap-fit ​​opening 1113a and smaller than the projected area of ​​the second snap-fit ​​opening 1113b.

[0087] The snap-fit ​​opening 1113 includes a first snap-fit ​​opening 1113a and a second snap-fit ​​opening 1113b arranged and connected to each other on the first wall 1111. Along the second direction Y, the projected area of ​​the second snap-fit ​​segment 1121b is larger than the projected area of ​​the first snap-fit ​​opening 1113a and smaller than the projected area of ​​the second snap-fit ​​opening 1113b. That is, the diameter of the first snap-fit ​​opening 1113a is smaller than the diameter of the second snap-fit ​​opening 1113b, and the second snap-fit ​​segment 1121b can pass through the first snap-fit ​​opening 1113a. The second snap-fit ​​opening 1113b cannot pass through the first snap-fit ​​opening 1113a. This allows the second snap-fit ​​segment 1121b to abut against the side of the first wall 1111 away from the battery cell module 30 after it passes through the second snap-fit ​​opening 1113b. This snap-fit ​​connection between the first wall 1111 and the base plate 112 is achieved by shifting the snap-fit ​​part 1121 into the first snap-fit ​​opening 1113a. The structure is simple, easy to operate, and has high connection strength.

[0088] Among them, Figure 9 In the second direction Y, the projected area of ​​the second latching segment 1121b is larger than the projected area of ​​the first latching opening 1113a but smaller than the projected area of ​​the second latching opening 1113b. This allows the second latching segment 1121b of the latching part 1121 to pass through the second latching opening 1113b along the second direction Y and be located on the side of the first wall 1111 away from the cell module 30. Then, the first latching segment 1121a of the latching part 1121 is moved into the first latching opening 1113a. Since the projected area of ​​the second latching segment 1121b is larger than the projected area of ​​the first latching opening 1113a along the second direction Y, the second latching segment 1121b cannot pass through the first latching opening 1113a. This allows the second latching segment 1121b to abut against the side of the first wall 1111 away from the cell module 30, thereby achieving a latching connection between the first wall 1111 and the base plate 112.

[0089] The first snap-fit ​​opening 1113a and the second snap-fit ​​opening 1113b are arranged in a direction perpendicular to the second direction Y and are interconnected. The arrangement direction of the first snap-fit ​​opening 1113a and the second snap-fit ​​opening 1113b is any direction within the plane where the first wall 1111 is located.

[0090] In some embodiments, the first snap-fit ​​opening 1113a and the second snap-fit ​​opening 1113b are arranged along a third direction Z. Of course, in other embodiments, the first snap-fit ​​opening 1113a and the second snap-fit ​​opening 1113b may also be arranged along a first direction X, etc.

[0091] By setting the first snap-fit ​​opening 1113a and the second snap-fit ​​opening 1113b to be arranged along the third direction Z, after the second snap-fit ​​segment 1121b of the snap-fit ​​part 1121 passes through the second snap-fit ​​opening 1113b, the first snap-fit ​​segment 1121a of the snap-fit ​​part 1121 can be switched within the first snap-fit ​​opening 1113a and the second snap-fit ​​opening 1113b simply by moving the first wall 1111 along the third direction Z. This enables the snap-fit ​​or de-snap-fit ​​between the first wall 1111 and the base plate 112, which helps to reduce the difficulty of disassembling and assembling the first wall 1111 and the base plate 112.

[0092] According to some embodiments of this application, see Figure 7 As shown, the base plate 112 is provided with a plurality of snap-fit ​​parts 1121, which are spaced apart along the third direction Z, and the snap-fit ​​openings 1113 are provided in a one-to-one correspondence with the snap-fit ​​parts 1121.

[0093] For example, there are two snap-fit ​​portions 1121 provided on the base plate 112, which are spaced apart along the third direction Z, and two snap-fit ​​openings 1113 are correspondingly provided on the first wall 1111. Of course, in other embodiments, the number of snap-fit ​​portions 1121 and snap-fit ​​openings 1113 can also be one, three, four, five or six, etc.

[0094] By providing multiple snap-fit ​​parts 1121 on the base plate 112 and providing multiple snap-fit ​​openings 1113 on the first wall 1111, the connection strength between the area of ​​the first wall 1111 corresponding to the cell 31 and the base plate 112 is further improved, thereby enhancing the constraint effect of the first wall 1111 on the cell module 30 and reducing the phenomenon of detachment due to excessive expansion force on the area of ​​the first wall 1111 corresponding to the cell 31, thus reducing the risk of deformation of the first wall 1111 and effectively improving the service life of the battery pack 100.

[0095] According to some embodiments of this application, refer to Figure 2 and Figure 7 Please refer to further details. Figure 10 , Figure 10 This is a structural view of a portion of the battery pack 100 provided in some embodiments of this application, viewed in the opposite direction to the first direction X. A first wall 1111 has a first opening 1111a, and a base plate 112 has a second opening 1122a. The battery pack 100 may further include a first fastener 114, which is disposed at the first opening 1111a and the second opening 1122a in a direction opposite to the second direction Y, to fasten the first wall 1111 and the base plate 112. Along the second direction Y, the projection of the first fastener 114 is opposite to the projection of the cell module 30.

[0096] A first fastener 114 is also provided between the first wall 1111 and the base plate 112. The first fastener 114 is provided in the first opening 1111a and the second opening 1122a along the second direction Y to fasten the first wall 1111 and the base plate 112, thereby further improving the connection strength and connection stability between the first wall 1111 and the base plate 112. Furthermore, by setting the projection of the first fastener 114 in the second direction Y to be separate from the projection of the cell module 30 in the second direction Y, the risk of the first fastener 114 puncturing the cell 31 of the cell module 30 can be effectively mitigated while improving the connection strength between the first wall 1111 and the base plate 112, thereby improving the safety and service life of the battery pack 100.

[0097] For example, the first fastener 114 is a bolt. After the first fastener 114 passes through the first opening 1111a of the first wall 1111 and the second opening 1122a of the base plate 112 in the direction facing the battery module 30, the first wall 1111 is screwed onto the base plate 112 by the first fastener 114. Of course, the first fastener 114 can also be a screw or the like.

[0098] In an embodiment where a connecting portion 1122 is formed on the base plate 112, the first fastener 114 can screw the first wall 1111 and the connecting portion 1122 of the base plate 112 to connect and fix the first wall 1111 to the base plate 112, that is, the second opening 1122a is provided on the connecting portion 1122 of the base plate 112.

[0099] In some embodiments, please continue to see Figure 2 and Figure 10 As shown, the battery pack 100 includes at least two first fasteners 114, and a first opening 1111a and a second opening 1122a are each corresponding to one of the first fasteners 114. The at least two first fasteners 114 are respectively located at both ends of the first wall 1111 in the first direction X. Along the third direction Z, the snap-fit ​​portion 1121 is located between the two first fasteners 114.

[0100] For example, in Figure 10 In the battery pack 100, two first fasteners 114 are provided, and the two first fasteners 114 are respectively provided at both ends of the first wall 1111 in the third direction Z, so that both ends of the first wall 1111 in the third direction Z can be connected to the base plate 112 by the first fasteners 114. Of course, in other embodiments, the number of first fasteners 114 can also be three, four, five or six, etc.

[0101] The battery pack 100 is provided with at least two first fasteners 114, and the at least two first fasteners 114 are respectively provided on both sides of the latching portion 1121 in the third direction Z. This allows the first fasteners 114 and the latching portion 1121 to cooperate with each other to improve the connection strength between the area of ​​the first wall 1111 corresponding to the cell 31 and the base plate 112, as well as the connection strength between the area of ​​the first wall 1111 not corresponding to the cell 31 and the base plate 112. This further improves the overall connection strength between the first wall 1111 and the base plate 112, thereby further reducing the risk of the first wall 1111 falling off or deforming due to the expansion of the cell 31 during use.

[0102] According to some embodiments of this application, see Figure 10 As shown, along the third direction Z, a gap 40 is formed between the cell module 30 and the side plate 13. Along the second direction Y, the projection of the first fastener 114 is located within the gap 40.

[0103] By spacing the cell module 30 and the side plate 13 in the third direction Z, a gap 40 is formed between the cell module 30 and the side plate 13, thereby setting the projection of the first fastener 114 in the second direction Y to be located within the gap 40, so that the projection of the first fastener 114 in the second direction Y is separate from the projection of the cell module 30 in the second direction Y.

[0104] The projection of the first fastener 114 is located within the gap 40, that is, the first fastener 114 is set in the second direction Y corresponding to the gap 40 formed between the cell module 30 and the side plate 13.

[0105] See Figure 10 As shown, the cell module 30 has gaps 40 between itself and the two side plates 13 in the third direction Z, so that the two first fasteners 114 located at both ends of the third plate in the third direction Z can be set with a gap 40 respectively, so that the projections of the two first fasteners 114 in the second direction Y are both separate from the projections of the cell module 30 in the second direction Y.

[0106] It should be noted that in the embodiment where a gap 40 is formed between the cell module 30 and the side plate 13, the gap 40 can also accommodate the connecting cable between the circuit board 20 and the cell 31. On the one hand, this facilitates the routing of the connecting cable, and on the other hand, it can further improve the internal space utilization of the battery pack 100.

[0107] According to some embodiments of this application, see Figure 1 , Figure 2 and Figure 10 As shown, a handle 131 is provided on the side plate 13. The handle 131 protrudes from the side of the side plate 13 facing the cell module 30 and is located within the gap 40.

[0108] The side plate 13 is also provided with a handle 131 for the operator to move the battery pack 100. By setting the handle 131 to protrude from the side plate 13 facing the cell module 30 and located within the gap 40, the gap 40 formed between the cell module 30 and the side plate 13 can be better utilized to improve the internal space utilization of the battery pack 100. Moreover, it is not necessary to set the handle 131 to be an outward protruding structure, which is conducive to optimizing the space occupied by the battery pack 100.

[0109] The side plate 13 is provided with mounting holes for mounting handle 131. The mounting holes extend through both sides of the side plate 13 in the third direction Z. The handle 131 is inserted into the mounting holes and protrudes from the side plate 13 in the third direction Z toward the battery cell module 30, so that the handle 131 can be accommodated in the gap 40.

[0110] Alternatively, the handle 131 can be installed on the side plate 13 in various ways. For example, the handle 131 can be connected to the side plate 13 by welding, bonding, snap-fitting or bolting.

[0111] exist Figure 10 In the middle, each of the two side plates 13 is provided with a handle 131, and each handle 131 is accommodated in the corresponding gap 40.

[0112] According to some embodiments of this application, refer to Figure 2 and Figure 7 Please refer to further details. Figure 11 , Figure 11 This is a schematic diagram of the structure of the base plate 112 of the first housing 11 of the housing 10 provided in some embodiments of this application. The base plate 112 is provided with two limiting portions 1123, and the battery cell module 30 is located between the two limiting portions 1123 along the third direction Z. That is, the two limiting portions 1123 are respectively located on both sides of the battery cell module 30 in the third direction Z.

[0113] By providing two limiting parts 1123 spaced apart along the third direction Z on the base plate 112, and with the two limiting parts 1123 located on both sides of the cell module 30, the two limiting parts 1123 can play a certain limiting role on the cell module 30, thereby helping to alleviate the phenomenon of the cell module 30 moving along the third direction Z inside the outer casing 10. This can effectively reduce the risk of damage to the cell 31 caused by the cell module 30 colliding with the side plate 13 or scraping with the first fastener 114, thereby improving the safety and service life of the battery pack 100.

[0114] Two limiting parts 1123 protrude from the side of the base plate 112 facing the cell module 30. The two limiting parts 1123 are spaced apart along the third direction Z and extend along the second direction Y, so that the two limiting parts 1123 can limit the cell module 30.

[0115] Optionally, the limiting part 1123 and the base plate 112 can be an integral structure, for example, made by an integral molding process such as stamping or casting. Of course, the limiting part 1123 and the base plate 112 can also be a separate structure, for example, the limiting part 1123 is connected to the base plate 112 by welding, bolting or snap-fitting.

[0116] In some embodiments, see Figure 7 and Figure 11 As shown, a positioning protrusion 1124 is provided on the base plate 112, and a positioning hole is provided on the limiting plate 113 to cooperate with the positioning protrusion 1124. The positioning hole is used for the positioning protrusion 1124 to be inserted.

[0117] For example, the base plate 112 is provided with two positioning protrusions 1124 spaced apart along the third direction Z. Correspondingly, the limiting plate 113 is provided with two positioning holes, each positioning hole for inserting one positioning protrusion 1124, so as to position and fix the limiting plate 113 on the base plate 112.

[0118] By providing a positioning protrusion 1124 on the base plate 112 and a corresponding positioning hole for inserting the positioning protrusion 1124 on the limiting plate 113, the positioning between the limiting plate 113 and the base plate 112 can be achieved, which helps to improve the assembly accuracy of the limiting plate 113 on the base plate 112. Furthermore, the positioning protrusion 1124 can also limit the limiting plate 113 in the second direction Y, thereby alleviating the phenomenon that the limiting plate 113 has a poor constraint effect on the expansion of the battery cell 31 due to the slippage of the limiting plate 113.

[0119] In some embodiments, the front cover 12 is bolted to the first housing 11 by a second fastener bolt. And / or, the side panel 13 is bolted to the first housing 11 by a third fastener bolt.

[0120] For example, the second fastener is a bolt, so that the front cover 12 can be screwed onto the first housing 11. Of course, the second fastener can also be a screw, etc. Similarly, the third fastener is also a bolt, so that the side plate 13 can be screwed onto the first housing 11. Of course, the third fastener can also be a screw, etc.

[0121] The front cover 12 is detachably connected to the first housing 11 by being screwed onto it with a second fastener. This structure is simple and easy to assemble and disassemble, which helps reduce the difficulty of subsequent maintenance of the battery pack 100. Similarly, the side plate 13 is detachably connected to the first housing 11 by being screwed onto it with a third fastener. This structure is simple and easy to assemble and disassemble, which also helps reduce the difficulty of subsequent maintenance of the battery pack 100.

[0122] According to some embodiments of this application, this application also provides an electrical device, including a battery pack 100 of any of the above schemes, and the battery pack 100 is used to provide electrical energy to the electrical device.

[0123] The electrical equipment can be any of the aforementioned devices or systems using the battery pack 100.

[0124] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0125] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery pack, characterized in that, include: The outer shell includes a first shell, a front cover, and two side plates. The first shell includes a main body, a bottom plate, and a limiting plate. The main body has a first wall and a second wall that are connected to each other. The first wall is connected to one end of the bottom plate. The base plate and the second wall are spaced apart along a first direction, and the limiting plate is fixedly connected to the second wall and the base plate, and is spaced apart from the first wall along a second direction; Along the second direction, the front cover is detachably connected to the side of the first housing opposite to the first wall and is spaced apart from the limiting plate. Along the third direction, the two side plates are detachably connected to the two sides of the first housing, and the first direction, the second direction and the third direction are perpendicular to each other. A circuit board is disposed between the limiting plate and the front cover; as well as A battery cell module is disposed between the limiting plate and the first wall, and the battery cell module includes a plurality of battery cells arranged along the second direction; The base plate has a snap-fit ​​part at one end. Along the second direction, the snap-fit ​​part protrudes away from the battery cell module. The projection of the snap-fit ​​part is located within the projection of the battery cell module. The first wall has a snap-fit ​​opening, which includes a first snap-fit ​​opening and a second snap-fit ​​opening. Both the first snap-fit ​​opening and the second snap-fit ​​opening penetrate the first wall along the second direction and are interconnected. The latching portion includes a first latching segment and a second latching segment connected sequentially along the second direction. The first latching segment is disposed at the first latching opening, and the second latching segment is connected to the base plate through the first latching segment. Along the second direction, the projected area of ​​the second latching segment is larger than the projected area of ​​the first latching segment. The second latching segment abuts against the side of the first wall away from the battery cell module, and the projected area of ​​the second latching segment is larger than the projected area of ​​the first latching opening and smaller than the projected area of ​​the second latching opening.

2. The battery pack according to claim 1, characterized in that, A connecting portion is formed at one end of the base plate, the first wall is located on the side of the connecting portion away from the battery cell module, and the snap-fit ​​portion protrudes from the side of the connecting portion away from the battery cell module.

3. The battery pack according to claim 1, characterized in that, The first snap-fit ​​opening and the second snap-fit ​​opening are arranged along the third direction.

4. The battery pack according to claim 1, characterized in that, The base plate is provided with a plurality of snap-fit ​​parts, which are spaced apart along the third direction, and the snap-fit ​​openings are provided in one-to-one correspondence with the snap-fit ​​parts.

5. The battery pack according to any one of claims 1-4, characterized in that, The first wall is provided with a first opening, and the bottom plate is provided with a second opening; The battery pack also includes a first fastener, which is disposed in the first opening and the second opening in a direction opposite to the second direction, to secure the first wall and the bottom plate. Along the second direction, the projection of the first fastener is separate from the projection of the battery cell module.

6. The battery pack according to claim 5, characterized in that, The battery pack includes at least two of the first fasteners, and the first opening and the second opening are respectively set to correspond one-to-one with the first fasteners; At least two of the first fasteners are located at the two ends of the first wall in the third direction; Along the third direction, the snap-fit ​​portion is located between the two first fasteners.

7. The battery pack according to claim 5, characterized in that, Along the third direction, a gap is formed between the battery cell module and the side plate; Along the second direction, the projection of the first fastener lies within the gap.

8. The battery pack according to claim 7, characterized in that, A handle is provided on the side plate, the handle protrudes from the side of the side plate facing the battery cell module, and the handle is located within the gap.

9. The battery pack according to claim 7, characterized in that, The base plate is provided with two limiting parts, and the battery cell module is located between the two limiting parts along the third direction.

10. The battery pack according to claim 1, characterized in that, The first wall and the second wall are integrally formed.

11. An electrical appliance, characterized in that, Includes the battery pack according to any one of claims 1-10.

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