Box body, battery pack and electric equipment

Abstract

The utility model discloses a box body, a battery pack and electric equipment, and relates to the technical field of new energy. The box body comprises a lower box body and an upper cover, the lower box body comprises a bottom plate and side beams, the bottom plate is provided with a battery cell placement area and a power distribution placement area, the side beams are connected with the bottom plate and located on at least one side of the battery cell placement area, one part of each side beam is located on one side of the power distribution placement area, and the top surface of each side beam is provided with a curved surface part; the upper cover covers the lower box body and comprises a top surface sealing area, a power distribution area and a curved surface sealing area; wherein the top surface sealing area is arranged right opposite to the battery cell placing area, the power distribution area is arranged right opposite to the power distribution placing area, the edge of the upper cover is hermetically connected with the side beam, and the curved surface sealing area is hermetically connected with the curved surface part. According to the embodiment of the utility model, the box body has higher strength and stability and a reliable sealing effect, and the use safety and reliability of the battery pack can be improved.

Description

Technical Field

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

[0002] In some existing battery pack structures, when the battery cell uses liquid electrolyte, its expansion is relatively small, and existing pack designs can meet the requirements for sealing and fixation. However, with the increasingly widespread application of solid-state electrolyte cells, their larger expansion characteristics pose certain challenges to existing structures. The significant expansion force generated by solid-state electrolyte cells during charging and discharging can easily lead to stress concentration in the pack, weakening connection strength and increasing the risk of seal failure. Some existing pack structures cannot adequately accommodate the expansion requirements of solid-state cells.

[0003] Therefore, there is room for improvement in the battery pack design. Utility Model Content

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, the first aspect of the present invention aims to provide a housing with high strength and stability, as well as a reliable sealing effect, thereby improving the safety and reliability of battery packs.

[0005] The second aspect of this utility model aims to provide a battery pack.

[0006] The purpose of the third aspect of this utility model is to provide an electrical device.

[0007] According to a first aspect of the present invention, a housing includes a lower housing and an upper cover. The lower housing includes a bottom plate and a side beam. The bottom plate has a cell placement area and a power distribution placement area. The side beam is connected to the bottom plate and is located on at least one side of the cell placement area. A portion of the side beam is located on one side of the power distribution placement area and has a curved surface on its top surface. The upper cover covers the lower housing and includes a top sealing area, a power distribution area, and a curved sealing area. The top sealing area is positioned opposite the cell placement area, and the power distribution area is positioned opposite the power distribution placement area. The edge of the upper cover is sealed to the side beam, and the curved sealing area is sealed to the curved surface.

[0008] According to some embodiments of the present invention, the battery pack housing is designed such that the top sealing area is directly opposite the cell placement area, ensuring that the space where the cells are located is isolated from the external environment and improving the stability of cell use.

[0009] By aligning the power distribution area with the power distribution placement area, the safety and reliability of the electrical connection are ensured. This sealed connection also provides sufficient mechanical strength to effectively prevent loosening caused by cell expansion or external vibration, thus guaranteeing the long-term stability and safety of the battery pack.

[0010] By incorporating curved sealing areas and sealing connections on curved surfaces, the connection area is increased, improving connection stability and effectively preventing loosening caused by cell expansion or external vibrations, thus ensuring the long-term stability and safety of the battery pack. Simultaneously, the curved connection provides consistent clamping force at multiple locations, achieving uniform pressure distribution and ensuring effective clamping of the curved sealing area, thereby enhancing the stability and reliable sealing of the enclosure.

[0011] By setting the edge of the top cover to be sealed to the side beam, the sealing effect is ensured, and the connection is effectively prevented from loosening due to cell expansion or external vibration, thereby improving the stability and reliable sealing of the enclosure.

[0012] According to some embodiments of the present invention, the battery pack housing has two side beams arranged opposite to each other, and each of the two side beams has a curved surface. The two sides of the top cover are respectively provided with curved sealing areas to seal and connect with the two curved surfaces.

[0013] In some embodiments, the lower housing further includes a rear beam connected to the base plate and between the two side beams, the rear beam being located on the side of the lower housing opposite to the power distribution placement area; the edge of the upper cover is sealed to the rear beam.

[0014] In some embodiments, the top cover includes: a top cover plate, which forms the top sealing area and the power distribution area; a side cover plate, which is connected to the side of the top cover plate where the power distribution area is located, with the upper end of the side cover plate connected to the top cover plate and the lower end sealed to the bottom plate; and two edge cover plates, which are connected to opposite sides of the side cover plate, with each edge cover plate connected to the top cover plate, and the lower end of each edge cover plate forming a first flange, the first flange forming the curved sealing area.

[0015] According to some optional embodiments of the present invention, the lower housing further includes: at least one reinforcing rib, the reinforcing rib being disposed on the cell placement area to divide the cell placement area into at least two sub-areas; the lower end of the reinforcing rib is connected to the bottom plate, and the upper end is sealed to the upper cover.

[0016] Specifically, the upper end of the reinforcing rib is connected to the upper cover by fasteners.

[0017] Optionally, the reinforcing rib is provided with a plurality of connecting holes, which are arranged at intervals along the length of the reinforcing rib, and the upper cover is provided with a plurality of mounting holes accordingly.

[0018] In some alternative embodiments, the reinforcing rib is provided with a first exhaust channel.

[0019] Specifically, the side beam is provided with an explosion-proof valve installation area, which is located on the side of the power distribution placement area. One end of the reinforcing rib extends to the power distribution placement area, and the first exhaust channel extends to the power distribution placement area.

[0020] In some alternative embodiments, the base plate, the side beams, and the reinforcing ribs are integrally extruded parts.

[0021] In some alternative embodiments, the lower housing includes a second flange welded to the top of the side beam, the second flange forming the curved surface.

[0022] According to some optional embodiments of the present invention, a second exhaust channel is provided on the side beam.

[0023] In some optional embodiments, the side beam is provided with an explosion-proof valve mounting area, the explosion-proof valve mounting area is located on the side of the power distribution placement area, and the second exhaust channel extends to the power distribution placement area.

[0024] According to some optional embodiments of the present invention, at least a portion of the lower surface of the top cover is provided with a buffer layer.

[0025] A battery pack according to a second aspect of the present invention includes: a housing of a battery pack according to a first aspect of the present application; multiple battery cells stacked on a battery cell placement area along the thickness direction of the base plate; and a power distribution unit disposed on a power distribution placement area.

[0026] In some optional embodiments, the battery cells are multiple and form at least one battery cell group; the battery cell group includes at least two core layers stacked along the thickness direction of the base plate, and each core layer includes at least two battery cells arranged along the length direction of the side beam; adjacent two battery cells on the same core layer are connected by a first connecting piece, and adjacent two core layers are connected by a second connecting piece, so that multiple battery cells in the entire battery cell group are connected in series.

[0027] In some alternative embodiments, the first connecting piece is provided with at least one protruding section, which is bent toward the upper cover or the bottom plate.

[0028] In some optional embodiments, the second connecting piece includes: two connecting segments, each of which extends along the length of the side beam and is welded to the two battery cells respectively; and a middle segment connecting the ends of the two connecting segments away from the battery cells.

[0029] An electrical device according to a third aspect of the present invention includes a battery pack according to a second aspect of the present application.

[0030] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0031] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0032] Figure 1 This is a schematic diagram of the battery pack structure according to some embodiments of the present invention;

[0033] Figure 2 This is a schematic diagram showing the position of the battery cell placed in the lower housing according to some embodiments of this utility model;

[0034] Figure 3 This is a schematic diagram of the lower housing structure according to some embodiments of the present invention;

[0035] Figure 4 This is a schematic diagram showing the location of the explosion-proof valve installation area in some embodiments of this utility model;

[0036] Figure 5 This is a schematic diagram of the structure of the top cover in some embodiments of the present utility model;

[0037] Figure 6 This is a perspective view of the top cover of some embodiments of the present utility model;

[0038] Figure 7 This is a schematic diagram showing the positions of the first exhaust channel and the second exhaust channel in some embodiments of this utility model;

[0039] Figure 8 This is a schematic diagram of the battery cell assembly according to some embodiments of the present invention;

[0040] Figure 9 This is a schematic diagram of the core layer structure in some embodiments of the present invention;

[0041] Figure 10 This is a schematic diagram showing the positions of the first connecting piece and the second connecting piece in some embodiments of this utility model;

[0042] Figure 11 This is a schematic diagram of the structure of the first connecting piece in some embodiments of the present invention.

[0043] Figure label:

[0044] Battery pack 100

[0045] 10. Enclosure body, 11. Lower enclosure, 111. Base plate, 111. Battery cell placement area, 1112. Sub-area, 11121. Power distribution placement area, 1113. Side beam, 114. Explosion-proof valve installation area, 1141. Second exhaust channel, 1142. Rear beam, 115. Reinforcing rib, 116. Connecting hole, 1161. First exhaust channel, 1162. Second flange, 117. Curved surface, 1171. Top cover, 13. Assembly hole, 130. Top cover plate, 1311. Top surface sealing area, 1311. Power distribution area, 1312. Side cover plate, 132. Edge cover plate, 133. First flange, 1331. Curved surface sealing area, 13311. Fastener, 14.

[0046] Battery cell 20, battery cell assembly 21, core layer 211, first connecting piece 212, protruding section 2121, second connecting piece 213, connecting section 2131, intermediate section 2132.

[0047] Power distribution unit 30. Detailed Implementation

[0048] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0049] In the description of this utility model, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0050] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0051] The following is for reference. Figures 1-11 The housing 10 of the battery pack 100 according to a first aspect embodiment of the present invention is described.

[0052] It is worth noting that the battery pack 100 housing 10 in this embodiment is suitable for both solid electrolyte cells 20 and traditional liquid electrolyte cells 20. This housing 10 structure can accommodate different types of cells 20, providing a highly versatile packaging solution.

[0053] like Figure 1 As shown, the housing 10 of this battery pack 100 includes a lower housing 11 and an upper cover 13. The lower housing 11 includes a bottom plate 111 and a side beam 114. The bottom plate 111 is provided with a cell placement area 1112 and a power distribution placement area 1113.

[0054] The base plate 111 serves as the supporting structure for the box 10.

[0055] Optionally, the cell placement area 1112 on the base plate 111 can be customized according to the size and arrangement requirements of the solid-state cell 20 to ensure that the cell 20 can be installed stably and heat dissipation is uniform. The power distribution placement area 1113 is used to house electrical components such as the battery management system (BMS), which are responsible for monitoring the battery status, controlling the charging and discharging process, and ensuring the safe operation of the battery pack 100.

[0056] Combination Figure 1 and Figure 2 The power distribution area 1113 on the base plate 111 is located to one side of the cell placement area 1112. The power distribution area 1113 is adjacent to but independent of the cell placement area 1112, ensuring an orderly layout and functional zoning of the internal structure of the battery pack 100, optimizing space utilization, and improving the safety and heat dissipation performance of the battery pack 100. This is because proper separation between the cell 20 and the power distribution components reduces electrical interference and facilitates the implementation of different thermal management measures for different areas. Furthermore, this layout provides convenience for installation and maintenance, allowing technicians to easily access various parts to inspect or replace components without affecting other components.

[0057] Reference Figure 2 and Figure 3 The cell placement area 1112 is open to the top and sides, forming two openings. This provides operators with a more spacious operating and visibility area when installing the cell 20, facilitating cell assembly and reducing inconvenience and errors caused by space constraints. At the same time, the larger operating space also allows for the use of larger tools or automated equipment for assembly, creating favorable conditions for automated assembly.

[0058] The side beam 114 is connected to the base plate 111 and is located on at least one side of the cell placement area 1112.

[0059] Combination Figures 1-3 The side beam 114 is used to connect the base plate 111 and provide additional structural strength and stability to the base plate 111. It is located on at least one side of the cell placement area 1112 to ensure that the cell placement area 1112 has sufficient support to prevent deformation or damage during transportation or use.

[0060] Combination Figure 2 and Figure 3 The side beams 114 are located on opposite sides of the cell placement area 1112. This effectively enhances the overall rigidity of the enclosure 10 and ensures that the cell placement area 1112 is uniformly supported in multiple directions, reducing the risk of deformation caused by external impacts or vibrations.

[0061] Combination Figures 2-4 A portion of the side beam 114 is located on one side of the power distribution placement area 1113 and has a curved surface 1171 on its top surface.

[0062] Here, the curved surface 1171 is placed in the power distribution placement area 1113, so as not to interfere with the normal operation and expansion space of the battery cell 20, thereby ensuring the functional and structural integrity of the battery cell placement area 1112.

[0063] The curved surface 1171 is constructed to provide a larger contact area, which helps to improve the connection strength.

[0064] like Figure 1 As shown, the upper cover 13 is fitted onto the lower box 11.

[0065] Combination Figure 5 The upper cover 13 includes a top surface sealing area 1311, a power distribution area 1312, and a curved surface sealing area 13311. See also... Figure 1 The top sealing area 1311 is positioned directly opposite the cell placement area 1112.

[0066] In the above technical solution, the top sealing area 1311 is located on the upper cover 13 and faces the cell placement area 1112 in the lower housing 11. When the upper cover 13 is tightly closed on the lower housing 11, the cell placement area 1112 is opposite to the top sealing area 1311. This arrangement ensures that the top sealing area 1311 can completely cover the top opening of the cell placement area 1112, thereby providing sealing protection.

[0067] The top sealing area 1311 provides a reliable seal for the cell placement area 1112, preventing external environmental factors (such as moisture, dust, and gas) from entering the battery pack 100 while maintaining stable internal pressure. In this way, the top sealing area 1311 ensures that the cell 20 is in a controlled and well-protected environment, helping to extend the lifespan of the cell 20 and improve the overall performance and safety of the battery pack 100. Furthermore, the top sealing area 1311 can effectively constrain the vertical expansion of the cell 20, preventing structural deformation or seal failure caused by cell expansion, further enhancing the reliability and safety of the battery pack 100.

[0068] Optionally, the top sealing area 1311 uses sealing materials (such as rubber sealing rings or silicone gaskets) to achieve waterproof, dustproof and gas-proof performance, thereby protecting the cell 20 from external environmental factors, maintaining internal pressure balance and extending the battery's service life.

[0069] The power distribution area 1312 and the power distribution placement area 1113 are positioned opposite each other. This allows the power distribution system and the battery cell 20 to operate independently, reducing electrical interference and thermal impact, and ensuring the stable operation of both. At the same time, this layout facilitates the maintenance and repair of the power distribution system.

[0070] The edge of the top cover 13 is sealed to the side beam 114, ensuring the airtightness of the entire battery pack 100.

[0071] Optionally, the edge of the top cover 13 is sealed to the side beam 114 with an adhesive layer. This adhesive seal fills the tiny gaps between them and, after curing, forms a strong yet flexible sealing layer. This ensures a good seal while also providing cushioning to absorb and disperse external impacts and vibrations.

[0072] Combination Figure 1 and Figures 5-6 The curved sealing area 13311 is sealed to the curved surface area 1171 to achieve the sealing of the power distribution placement area 1113.

[0073] Optionally, the curved sealing area 13311 and the curved surface 1171 are sealed together by an adhesive layer. The adhesive layer not only fills the tiny gaps between them, but also forms a strong yet flexible sealing barrier after curing, ensuring a tight seal. At the same time, the sealant has cushioning properties, which can effectively absorb and disperse external impacts and vibrations, enhancing the stability and durability of the housing 10, thereby extending the service life of the battery pack 100.

[0074] The connection line between the curved sealing area 13311 and the curved surface 1171 is curved.

[0075] First, the curved connection can provide consistent clamping force at multiple different locations, achieving uniform pressure distribution and ensuring that the entire curved sealing area 13311 can be effectively clamped.

[0076] Secondly, when the upper cover 13 and the lower box 11 are closed, the curved connection between the two can increase the connection area to a certain extent and improve the connection stability.

[0077] Furthermore, the curved seal forms abutments both vertically and horizontally, thereby preventing the top cover 13 from loosening and falling off.

[0078] According to some embodiments of the present utility model, such as the housing 10, Figure 1 As shown, there are two side beams 114 arranged opposite to each other. Both side beams 114 are provided with curved surfaces 1171. The upper cover 13 is provided with curved sealing areas 13311 on both sides to seal and connect with the two curved surfaces 1171.

[0079] Specifically, the two side beams 114 are located on both sides of the cell placement area 1112, providing support from both sides and enhancing the rigidity and deformation resistance of the housing 10.

[0080] Curved sealing areas 13311 are provided on both sides of the top cover 13. These curved sealing areas 13311 match the curved surface 1171 on the side beam 114 and achieve a sealed connection.

[0081] The curved seals on both sides increase the sealing area, providing a larger contact area and greater angle of contact force, ensuring efficient sealing and stable connection of the power distribution area 1312. The curved shape can provide consistent clamping force at different locations, further enhancing the sealing effect.

[0082] In some alternative embodiments, such as Figures 1-3 As shown, the lower enclosure 11 also includes a rear beam 115, which is connected to the base plate 111 and between two side beams 114. The rear beam 115 is located on the side of the lower enclosure 11 opposite to the power distribution placement area 1113.

[0083] Here, the rear beam 115 connects to the base plate 111 and works together with the two side beams 114 to make the entire housing 10 structure more stable. This three-sided support structure further improves the overall rigidity and deformation resistance of the housing 10, especially when subjected to external impacts or vibrations, it can evenly distribute stress and reduce the risk of excessive local stress. This helps to improve the safety of the battery pack 100 and also extends its service life.

[0084] The edge of the top cover 13 is sealed to the rear beam 115. Alternatively, the edge of the top cover 13 and the rear beam 115 are sealed together by an adhesive layer. The adhesive layer not only fills the tiny gaps between them, but also forms a strong yet flexible sealing barrier after curing, ensuring a tight seal. At the same time, the sealant has cushioning properties, effectively absorbing and dispersing external impacts and vibrations, enhancing the stability and durability of the housing 10, thereby extending the service life of the battery pack 100.

[0085] In some specific embodiments, such as Figure 5 and Figure 6 As shown, the upper cover 13 includes a top cover plate 131, a side cover plate 132, and two edge cover plates 133. The top cover plate 131 forms a top surface sealing area 1311 and a power distribution area 1312. The side cover plate 132 is connected to the side of the top cover plate 131 where the power distribution area 1312 is located. The upper end of the side cover plate 132 is connected to the top cover plate 131, and the lower end is sealed to the bottom plate 111. The two edge cover plates 133 are connected to opposite sides of the side cover plate 132, and each edge cover plate 133 is connected to the top cover plate 131. The lower end of each edge cover plate 133 forms a first flange 1331, which forms a curved surface sealing area 13311.

[0086] In this specific embodiment, the upper cover 13 structure is subdivided into multiple parts, corresponding to different areas, thus forming different functional areas. The top cover 131 integrates the top surface sealing area 1311 and the power distribution area 1312, ensuring the proper placement and protection of the battery cell 20 and the power distribution.

[0087] The cover side plate 132 is connected to the side of the cover top plate 131 where the power distribution area 1312 is located, forming a vertically extending protective barrier. Its upper end is connected to the cover top plate 131, and its lower end is sealed and connected through the bottom plate 111, effectively isolating external interference.

[0088] Furthermore, two cover edge plates 133 are respectively connected to both sides of the cover side plate 132, which helps to enhance the overall structural strength of the upper cover 13. Each cover edge plate 133 is connected to the cover top plate 131, and its lower end first flange 1331 forms a curved sealing area 13311, which fits against the curved surface 1171 of the side beam 114 of the lower housing 11, thereby achieving a better sealing effect. The good sealing improves the waterproof and dustproof rating of the battery pack 100, and also ensures the stability of the internal environment, ensuring the long-term stable operation of the solid electrolyte cell 20.

[0089] In some embodiments, the top cover 131, the side cover 132, and the two side cover plates 133 are integrally formed.

[0090] In this way, by integrating the top cover 131, side cover 132, and two edge cover 133 into a continuous monolithic structure, connection points and seams in traditional welding or assembly processes are eliminated. This improves the structural strength of the top cover 13 and reduces potential risks caused by weak connection points. The entire top cover 13 forms a robust monolithic frame that can better withstand external impacts, vibrations, and other mechanical stresses.

[0091] Optionally, the top cover 13 is made of metal, such as steel. The top cover 131, the side cover 132, and the two side cover plates 133 are integrally stamped parts.

[0092] The one-piece stamping process ensures a uniform distribution of material throughout the entire top cover 13, avoiding the problem of inconsistent material thickness in certain areas. This not only helps improve the uniformity and stability of the top cover 13 structure, but also enhances fatigue resistance and extends the service life of the top cover 13.

[0093] According to some optional embodiments of the present invention, such as Figures 2-4 As shown, the lower housing 11 also includes at least one reinforcing rib 116, which is disposed on the cell placement area 1112 to divide the cell placement area 1112 into at least two sub-areas 11121. The lower end of the reinforcing rib 116 is connected to the bottom plate 111, and the upper end is sealed to the upper cover 13.

[0094] Specifically, the lower end of the reinforcing rib 116 is connected to the base plate 111, and the upper end of the reinforcing rib 116 is connected to the top cover 13, forming a continuous support structure from bottom to top. This enhances the structural strength of the cell placement area 1112. When the housing 10 is subjected to external impact or vibration, the reinforcing rib 116 can effectively disperse stress, reduce the risk of excessive local stress, and thus improve the durability and safety of the entire battery pack 100.

[0095] In some such Figures 1-4 In the illustrated embodiment, the reinforcing rib 116 extends along a first direction. Typically, the battery pack 100 is a cuboid; here, the first direction is the length direction of the housing 10. In some designs, the reinforcing rib 116 may also extend along the width direction of the battery pack 100.

[0096] In some such Figures 1-4 In the illustrated embodiment, there are multiple reinforcing ribs 116, which are spaced apart along a second direction. Here, the second direction is the width direction of the housing 10. In some embodiments, the multiple reinforcing ribs 116 may also be spaced apart along the length direction of the battery pack 100.

[0097] The partitioned design of the reinforcing rib 116 not only helps optimize the internal layout of the battery cell 20, but also prevents mutual interference between some of the battery cells 20, ensuring that the battery cell 20 can operate in a relatively independent space. In addition, the partitioned sub-regions 11121 can better adapt to the shape and size of the battery cell 20, improving the stability of the battery cell 20.

[0098] In some specific embodiments, such as Figure 7 As shown, the upper end of the reinforcing rib 116 is connected to the upper cover 13 by a fastener 14.

[0099] The fastener 14 can be a bolt, screw, or the like. The fastener 14 has high strength and corrosion resistance, and is easy to install, ensuring the reliability and durability of the connection.

[0100] Specifically, the reinforcing rib 116 is provided with a plurality of connecting holes 1161, which are arranged at intervals along the length of the reinforcing rib 116, and the upper cover 13 is provided with a plurality of mounting holes 130.

[0101] The connecting holes 1161 are arranged in different positions to ensure that the housing 10 can provide sufficient support and stability in different positions.

[0102] Here, the number and spacing of the connection holes 1161 can be adjusted according to specific structural requirements to adapt to the strength and sealing performance of battery packs 100 of different sizes.

[0103] Optionally, the connecting hole 1161 can be a threaded hole. This allows the fastener 14 (such as a bolt or screw) to be directly screwed into the threaded hole for fastening. Alternatively, the connecting hole 1161 can also be a non-threaded hole. For example, the connecting hole 1161 can be a smooth hole. This can reduce processing costs. In this case, the fastener 14 can be a regular bolt, a self-locking bolt, an expansion bolt, etc.

[0104] Optionally, the mounting hole 130 can be a threaded hole, or the mounting hole 130 can be a non-threaded hole.

[0105] According to some optional embodiments of the present invention, such as Figures 3-4 and Figure 7 As shown, the reinforcing rib 116 is provided with a first exhaust channel 1162.

[0106] For example, in extreme cases, such as thermal runaway of cell 20, a large amount of high-temperature gas and heat will be generated. The first venting channel 1162 allows these high-temperature gases to escape from the outside of the battery pack 100, preventing a sharp increase in internal pressure and reducing the risk of explosion or rupture. By timely venting the heated gas, the first venting channel 1162 can effectively mitigate the sharp rise in internal temperature.

[0107] The first venting channel 1162 not only helps to expel hot gases but also reduces the possibility of heat diffusion. When a battery cell 20 experiences thermal runaway, if not handled promptly, the high temperature may be conducted to adjacent battery cells 20, causing a chain reaction and potentially leading to a larger safety accident. The presence of the first venting channel 1162 can quickly expel heat and gases, reducing the speed and extent of heat conduction and protecting the safety of other battery cells 20 and components.

[0108] Optionally, the first exhaust channel 1162 extends along the length of the reinforcing rib 116. Here, the first exhaust channel 1162 runs through the entire reinforcing rib 116, covering a large area of ​​the cell placement area 1112, ensuring that in the event of thermal runaway at most locations of the reinforcing rib 116, high-temperature gases can be quickly discharged through the first exhaust channel 1162. The first exhaust channel 1162 is constructed in an elongated shape, which can provide a more uniform exhaust path and prevent high-temperature gases from accumulating in certain areas.

[0109] The size and number of the first venting channels 1162 can be determined based on the capacity of the battery pack 100, the number of cells 20, and the expected risk of thermal runaway. For example, larger and more numerous first venting channels 1162 can expel gas more quickly. Smaller and fewer first venting channels 1162 can ensure the structural stability of the housing 10.

[0110] In some alternative embodiments, combined with Figure 3 and Figure 4 The side beam 114 is provided with an explosion-proof valve installation area 1141, which is located on the side of the power distribution placement area 1113. One end of the reinforcing rib 116 extends to the power distribution placement area 1113, and the first exhaust channel 1162 extends to the power distribution placement area 1113.

[0111] The explosion-proof valve installation area 1141 is used to install an explosion-proof valve. It is understood that the explosion-proof valve is a safety device for the battery pack 100, which automatically opens when the internal pressure of the battery pack 100 exceeds a preset threshold, releasing excessive pressure and preventing the battery pack 100 from exploding due to excessive internal pressure.

[0112] Specifically, when an abnormal increase in internal pressure is detected, the explosion-proof valve will open immediately to release the gas into the external environment, thereby protecting the safety of the battery pack 100 and other components.

[0113] In the above technical solution, the explosion-proof valve installation area 1141 is set on the side of the power distribution placement area 1113, so that the explosion-proof valve can respond quickly and release internal pressure to prevent the battery pack 100 from exploding or rupturing.

[0114] Here, one end of the reinforcing rib 116 extends to the power distribution placement area 1113, forming a continuous support structure from the cell placement area 1112 to the power distribution placement area 1113. This also allows the first exhaust channel 1162 to extend from the cell placement area 1112 to the power distribution placement area 1113, thereby connecting with the explosion-proof valve. This not only enhances the structural strength of the entire lower housing 11 but also provides continuous space for the arrangement of the first exhaust channel 1162, forming a complete and unobstructed exhaust path.

[0115] In some specific embodiments, the base plate 111, the side beam 114, and the reinforcing rib 116 are integrally extruded parts.

[0116] By forming a one-piece extruded component, the base plate 111, side beams 114, and reinforcing ribs 116 are integrated into a continuous monolithic structure, eliminating some connection points and seams found in traditional welding or assembly processes. This one-piece extruded component not only improves the structural strength of the lower housing 11 but also reduces potential risks caused by weak connection points. The entire lower housing 11 forms a robust integral frame, better able to withstand external impacts, vibrations, and other mechanical stresses, thus improving the safety and reliability of the battery pack 100.

[0117] Optionally, the base plate 111, side beams 114, and reinforcing ribs 116 are integrally extruded steel parts.

[0118] like Figures 2-4 As shown, the lower housing 11 of the battery pack 100 according to some embodiments of the present invention includes a second flange 117 welded to the top of the side beam 114, the second flange 117 forming a curved surface 1171.

[0119] The second flange 117 is welded to the top of the side beam 114, located in the area where the side beam 114 contacts the top cover 13. The second flange 117 extends along the length of the side beam 114, forming a continuous edge structure. This design ensures that the entire top of the side beam 114 can fit tightly against the top cover 13, providing uniform support and sealing.

[0120] According to some alternative embodiments, refer to Figures 3-4 and Figure 7 A second exhaust channel 1142 is provided on the side beam 114.

[0121] The second exhaust channel 1142 provides an additional gas venting path for the cell placement area 1112 adjacent to the side beam 114 within the battery pack 100. Therefore, the second exhaust channel 1142 ensures that, in the event of thermal runaway, gas can be rapidly and effectively expelled from the battery pack 100, thereby reducing internal pressure and ensuring the safety of the battery pack 100.

[0122] Optionally, the second exhaust passage 1142 extends along the length of the side beam 114.

[0123] In some embodiments, the side beam 114 is provided with an explosion-proof valve mounting area 1141, which is located on the side of the power distribution placement area 1113, and the second exhaust channel 1142 extends to the power distribution placement area 1113.

[0124] In the above technical solution, the second exhaust channel 1142 extends to the power distribution placement area 1113, thereby enabling the second exhaust channel 1142 to extend from the cell placement area 1112 to the power distribution placement area 1113, and then connect with the explosion-proof valve in the explosion-proof valve installation area 1141 to form a complete and unobstructed exhaust path.

[0125] In some alternative embodiments, at least a portion of the lower surface of the cover 13 is provided with a cushioning layer.

[0126] For example, a buffer layer is provided in the top sealing area 1311 of the top cover 13. In this way, the buffer layer can cope with the expansion force that the cell 20 may generate during use. Since the battery will undergo thermal expansion and contraction during charge and discharge cycles, the slight expansion of the cell 20 is a normal phenomenon. However, if it is not controlled, it may put pressure on the packaging structure of the battery pack 100, thereby affecting the performance and safety of the battery pack 100.

[0127] For example, a buffer layer is provided in the power distribution area 1312 of the top cover 13. In this way, the buffer layer can absorb the shaking that may be generated by the power distribution system during use, reduce the mechanical displacement of the power distribution system, not only improve the stability of the enclosure 10, but also improve the reliability of electrical connections, and ensure the safe operation of the battery pack 100 under various operating conditions.

[0128] For example, buffer layers are provided in both the top sealing area 1311 and the power distribution area 1312. This dual-protection structure can not only effectively cope with the expansion force of the battery cell 20 and the shaking of the power distribution system, but also further enhance the structural stability and durability of the entire battery pack 100, while improving the overall safety and reliability of the battery pack 100.

[0129] Optionally, the buffer layer is made of an elastic material, thus possessing a certain degree of deformation capability. This means that when the battery cell 20 expands, the buffer layer can absorb some of the expansion force, alleviating the pressure on the battery pack 100 structure through moderate deformation. This design not only improves the durability of the battery pack 100 but also extends the battery's lifespan.

[0130] The buffer layer can be a high-performance polymer layer such as a rubber layer, a silicone layer, or a rigid polyurethane material layer. These material layers are firmly bonded to the inside of the top cover 13 by an adhesive layer, forming a sturdy yet flexible top cover 13. Here, the adhesive layer ensures a tight bond between the buffer layer and the top cover 13, preventing the intrusion of external factors such as moisture and dust, and providing a reliable environment for the battery cell 20. It also provides sufficient adhesive force so that the buffer layer can effectively play a fixing role when the battery cell 20 expands.

[0131] like Figure 1 The battery pack 100 according to a second aspect embodiment of the present invention includes: a housing 10, battery cells 20, and a power distributor 30. Multiple battery cells 20 are stacked along the thickness direction of the base plate 111 on a cell placement area 1112. The power distributor 30 is disposed on a power distribution placement area 1113. The housing 10 is the same as the housing 10 described in the first aspect embodiment of the present invention.

[0132] Here, the housing 10 serves as the outer shell of the battery pack 100, protecting the internal components and isolating them from external interference.

[0133] The battery cell 20 is used to store energy. In this embodiment, there are multiple battery cells 20, which are stacked and arranged in the battery cell placement area 1112 along the thickness direction of the bottom plate 111 of the housing 10. This stacking arrangement greatly improves the energy density of the battery pack 100, allowing more battery cells 20 to be accommodated in a limited volume, thereby extending the driving range of the battery pack 100.

[0134] The power distributor 30 is responsible for safely and efficiently delivering the electrical energy generated by the battery cell 20 to external devices. In this embodiment, the power distributor 30 is located within the power distribution placement area 1113 and is kept at an appropriate distance from the battery cell 20 to ensure good heat dissipation and electrical isolation.

[0135] By using the housing 10 of the first aspect embodiment of this application, the overall structural strength of the battery pack 100 can be improved, while also helping to limit the excessive expansion of the battery cell 20 during the charging and discharging process, thereby improving the safety and durability of the battery pack 100, providing a more stable working environment for the battery cell 20, and extending the service life of the battery pack 100.

[0136] According to some optional embodiments, such as Figure 8 and Figure 9 As shown, there are multiple battery cells 20, which together form at least one battery cell group 21.

[0137] The cell assembly 21 includes at least two core layers 211 stacked along the thickness direction of the base plate 111. Each core layer 211 includes at least two cells 20 arranged along the length direction of the side beam 114. Adjacent cells 20 on the same core layer 211 are connected by a first connecting piece 212, and adjacent core layers 211 are connected by a second connecting piece 213, so that multiple cells 20 in the entire cell assembly 21 are connected in series.

[0138] In the above technical solution, the battery cell assembly 21 is composed of at least two core layers 211, which are stacked along the thickness direction of the base plate 111.

[0139] In some technical solutions, the thickness direction of the base plate 111 is vertical, and the core layer 211 is stacked along the vertical direction.

[0140] Each core layer 211 contains a plurality of battery cells 20, which are arranged along the length of the side beam 114.

[0141] In some technical solutions, the length direction of the side beam 114 is horizontal. This multi-layered stacked structure allows the cell pack 21 to accommodate more cells 20 in a limited space, thereby increasing the energy density of the battery pack 100.

[0142] Optionally, the cells 20 in each core layer 211 are evenly arranged along the length of the side beam 114 to ensure that the distance between the cells 20 is consistent, which facilitates heat dissipation and maintenance.

[0143] The number of cells 20 can be adjusted according to specific application requirements to adjust the capacity of the battery pack 100.

[0144] The multi-layered structure allows the cell assembly 21 to expand appropriately in the height direction to accommodate the volume changes of the cell 20 caused by temperature changes and chemical reactions during charging and discharging.

[0145] In this way, the buffer layer and the top cover 13 work together to form an effective expansion management system. The buffer layer allows the cell assembly 21 to expand freely within a certain range, while the top cover 13 provides restraint when the cell assembly 21 expands to its limit, preventing excessive expansion. Therefore, the top cover 13 and the buffer layer protect the structural integrity of the cell assembly 21 while ensuring the safety and performance of the battery pack 100.

[0146] The first connecting piece 212 and the second connecting piece 213 ensure stable current transmission and realize the series connection of multiple cells 20 in the entire cell group 21, thereby improving the energy density of the battery pack 100.

[0147] Optionally, the first connecting piece 212 and the second connecting piece 213 are flexible connecting pieces. When some of the battery cells 20 expand, the flexible connecting pieces can be stretched appropriately to maintain the electrical connection between the battery cells 20. Therefore, through the connection of the flexible connecting pieces, the battery pack 100 can not only adapt to the expansion of the battery cells 20, but also reduce the impact of mechanical stress and prevent structural damage and poor connection of the battery cells 20.

[0148] Flexible connecting pieces can be made of materials with high conductivity and good elasticity, such as flexible copper strips, nickel-plated copper strips, or flexible aluminum strips. These materials not only possess excellent conductivity but can also undergo elastic deformation within a certain range and return to their original shape.

[0149] In addition, flexible connecting pieces can be coated with an insulating layer or an anti-corrosion coating to improve their corrosion resistance and insulation performance.

[0150] In some alternative embodiments, such as Figures 9-11 As shown, the first connecting piece 212 is provided with at least one protrusion 2121, which is bent toward the upper cover 13 or the bottom plate 111.

[0151] The protruding section 2121 is a local protrusion on the first connecting piece 212, and is usually arranged along the length of the connecting piece. The shape of the protruding section 2121 can be arc-shaped, wavy, or other suitable curved shape. The specific shape depends on the layout and expansion characteristics of the cell assembly 21, and this application does not impose any restrictions.

[0152] The top of the protruding section 2121 bends toward the upper cover 13 or the bottom plate 111, forming an upward arched structure.

[0153] The protruding section 2121 can provide additional space for elastic deformation.

[0154] For example, when some cells 20 in the cell pack 21 experience slight displacement, the protrusion 2121 can adapt to these changes through elastic deformation, ensuring that the connection between the cells 20 is not affected. This multi-dimensional adaptability enables the protrusion 2121 to better cope with complex working environments and improve the overall reliability of the battery pack 100.

[0155] The protruding section 2121 can not only accommodate the expansion of the cell 20 in the height direction, but also cope with the slight displacement of the cell 20 in the horizontal direction.

[0156] For example, when the cell 20 expands, the protrusion 2121 can absorb the displacement of the cell 20 through its own bending deformation without applying excessive mechanical stress to the cell 20, thereby improving the flexibility of the connecting piece and enhancing its ability to adapt to the expansion of the cell 20.

[0157] Specifically, when some of the battery cells 20 expand, the distance between the battery cells 20 increases, and the first connecting piece 212 is stretched. At this time, the protruding section 2121 bends towards the upper cover 13 or the bottom plate 111 through its own elastic deformation, absorbing the displacement of the battery cells 20 and preventing the first connecting piece 212 from breaking or loosening.

[0158] In some alternative embodiments, such as Figure 9 and Figure 10 As shown, the second connecting piece 213 includes two connecting sections 2131 and an intermediate section 2132. Each connecting section 2131 extends along the length of the side beam 114, and the two connecting sections 2131 are welded to the two battery cells 20 respectively. The intermediate section 2132 connects the ends of the two connecting sections 2131 that are away from the battery cells 20.

[0159] In the above technical solution, the two connecting segments 2131 of the second connecting piece 213 extend along the length direction of the side beam 114, and one end of each connecting segment 2131 is firmly connected to the pole of the battery cell 20 by welding.

[0160] The connecting section 2131 ensures that current can be smoothly transferred from one cell 20 to another cell 20, realizing the series connection between cells 20.

[0161] The intermediate section 2132 is located at the end of the two connecting sections 2131 furthest from the cell 20, and serves as a connection. Optionally, the intermediate section 2132 can be straight, arc-shaped, or wavy, depending on the layout and expansion characteristics of the cell assembly 21.

[0162] The intermediate section 2132 provides additional mechanical strength to ensure that the second connecting piece 213 does not break or deform when the cell 20 expands. At the same time, the intermediate section 2132 can also adapt to the volume change of the cell assembly 21 through its own elastic deformation, maintaining the electrical connection between the cells 20.

[0163] Optionally, the connecting segment 2131 may be made of a highly conductive material, such as copper or aluminum, to ensure efficient current transfer. To improve conductivity, the surface of the connecting segment 2131 may be nickel-plated or otherwise surface-treated to reduce contact resistance and energy loss. Furthermore, the thickness of the connecting segment 2131 can be optimized according to current requirements.

[0164] The electrical equipment according to a third aspect of the present invention includes a battery pack 100 according to a second aspect of the present invention.

[0165] Utilizing the highly stable and safe battery pack 100 enhances the reliability of electrical equipment, providing stable and efficient power support for various application scenarios.

[0166] The following is for reference. Figure 1 - Figure 11 The battery pack 100 according to an embodiment of the present invention is described in detail with reference to a specific example. It is to be understood that the following description is merely illustrative and not intended to limit the scope of the invention.

[0167] Reference Figure 1 The battery pack 100 includes: a housing 10, battery cells 20, and a power distributor 30.

[0168] The housing 10 includes a lower housing 11 and an upper cover 13.

[0169] The upper cover 13 is placed on the lower box 11.

[0170] Reference Figures 2-4 The lower box body 11 includes: a bottom plate 111, a side beam 114, a rear beam 115, a reinforcing rib 116, and a second flange 117.

[0171] The base plate 111 is provided with a cell placement area 1112 and a power distribution placement area 1113.

[0172] There are two side beams 114, which are arranged opposite each other on both sides of the cell placement area 1112. A portion of each side beam 114 is located on one side of the power distribution placement area 1113 and a second flange 117 is welded to its top surface, forming a curved surface 1171.

[0173] The side beam 114 is provided with a second exhaust channel 1142 and an explosion-proof valve installation area 1141.

[0174] The explosion-proof valve installation area 1141 is located on the side of the power distribution placement area 1113, and the second exhaust channel 1142 extends to the power distribution placement area 1113.

[0175] The rear beam 115 is connected to the base plate 111 and is connected between the two side beams 114. The rear beam 115 is located on the side of the lower housing 11 opposite to the power distribution placement area 1113.

[0176] There are multiple reinforcing ribs, numbered 116.

[0177] The lower end of each reinforcing rib 116 is connected to the base plate 111. The reinforcing rib 116 is provided with multiple connecting holes 1161, which are arranged at intervals along the length of the reinforcing rib 116. The upper cover 13 is provided with multiple mounting holes 130.

[0178] Reference Figure 7 After passing through the mounting hole 130, the fastener 14 is connected to the connecting hole 1161 to achieve the connection between the upper end of the reinforcing rib 116 and the upper cover 13.

[0179] One end of the reinforcing rib 116 extends to the power distribution placement area 1113. The reinforcing rib 116 is also provided with a first exhaust channel 1162. The first exhaust channel 1162 extends to the power distribution placement area 1113.

[0180] Among them, the base plate 111, the side beam 114 and the reinforcing rib 116 are integrally extruded parts.

[0181] Reference Figures 5-6 The top cover 13 includes: a top cover plate 131, a side cover plate 132, two side cover plates 133, and a buffer layer.

[0182] The top cover plate 131 forms the top sealing area 1311 and the power distribution area 1312.

[0183] The top sealing area 1311 is positioned directly opposite the cell placement area 1112.

[0184] Multiple reinforcing ribs 116 are provided on the cell placement area 1112 to divide the cell placement area 1112 into multiple sub-areas 11121.

[0185] The power distribution area 1312 is positioned opposite the power distribution placement area 1113, and the edge of the upper cover 13 is sealed to the side beam 114 and the rear beam 115.

[0186] The cover side plate 132 is connected to the side of the cover top plate 131 where the power distribution area 1312 is located. The upper end of the cover side plate 132 is connected to the cover top plate 131, and the lower end is sealed to the bottom plate 111.

[0187] Two cover edge plates 133 are connected to opposite sides of the cover side plate 132, and each cover edge plate 133 is connected to the cover top plate 131. The lower end of each cover edge plate 133 forms a first flange 1331, which constitutes a curved sealing area 13311. The curved sealing area 13311 is sealed to the curved surface 1171.

[0188] The buffer layer is provided on the lower surface of the cover plate 131.

[0189] Reference Figures 8-11 The battery cell assembly 21 includes multiple core layers 211 stacked along the thickness direction of the base plate 111. Each core layer 211 includes multiple battery cells 20 arranged along the length direction of the side beam 114. Adjacent battery cells 20 on the same core layer 211 are connected by a first connecting piece 212, and adjacent core layers 211 are connected by a second connecting piece 213, so that the multiple battery cells 20 in the entire battery cell assembly 21 are connected in series.

[0190] The first connecting piece 212 has a protrusion 2121, which is bent toward the upper cover 13.

[0191] The second connecting piece 213 includes two connecting sections 2131 and an intermediate section 2132. Each connecting section 2131 extends along the length of the side beam 114, and the two connecting sections 2131 are welded to the two battery cells 20 respectively. The intermediate section 2132 connects the ends of the two connecting sections 2131 that are away from the battery cells 20.

[0192] The power distribution unit 30 is installed in the power distribution placement area 1113.

[0193] Other components of the battery pack 100 according to the present invention, such as electrical devices and their operation, are known to those skilled in the art and will not be described in detail here.

[0194] In the description of this specification, references to terms such as "embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0195] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery pack housing, characterized in that, include: The lower housing includes a bottom plate and side beams. The bottom plate is provided with a cell placement area and a power distribution placement area. The side beams are connected to the bottom plate and are located on at least one side of the cell placement area. A portion of the side beams is located on one side of the power distribution placement area and has a curved surface on its top surface. The upper cover fits onto the lower housing, and the upper cover includes a top sealing area, a power distribution area, and a curved sealing area. The top sealing area is positioned directly opposite the cell placement area, the power distribution area is positioned directly opposite the power distribution placement area, the edge of the top cover is sealed to the side beam, and the curved sealing area is sealed to the curved surface.

2. The battery pack housing according to claim 1, characterized in that, There are two side beams arranged opposite each other, and each side beam has a curved surface. The two sides of the top cover are respectively provided with curved sealing areas to seal and connect with the two curved surfaces.

3. The battery pack housing according to claim 2, characterized in that, The lower enclosure also includes a rear beam, which is connected to the bottom plate and between the two side beams. The rear beam is located on the side of the lower enclosure opposite to the power distribution area. The edge of the upper cover is sealed to the rear beam.

4. The battery pack housing according to claim 2, characterized in that, The top cover includes: A top cover plate, which forms the top surface sealing area and the power distribution area; A side cover is provided, which is connected to the side of the top cover where the power distribution area is located. The upper end of the side cover is connected to the top cover, and the lower end is sealed to the bottom plate. Two cover edge plates are connected to opposite sides of the cover side plate, and each cover edge plate is connected to the cover top plate. The lower end of each cover edge plate forms a first flange, which constitutes the curved sealing area.

5. The battery pack housing according to claim 1, characterized in that, The lower housing further includes at least one reinforcing rib, which is disposed on the cell placement area to divide the cell placement area into at least two sub-areas; The lower end of the reinforcing rib is connected to the base plate, and the upper end is sealed to the top cover.

6. The battery pack housing according to claim 5, characterized in that, The upper end of the reinforcing rib is connected to the upper cover by fasteners.

7. The battery pack housing according to claim 6, characterized in that, The reinforcing rib is provided with a plurality of connecting holes, which are arranged at intervals along the length of the reinforcing rib, and the upper cover is provided with a plurality of corresponding assembly holes.

8. The battery pack housing according to claim 5, characterized in that, The reinforcing rib is provided with a first exhaust channel.

9. The housing of the battery pack according to claim 8, characterized in that, The side beam is provided with an explosion-proof valve installation area, which is located on the side of the power distribution placement area. One end of the reinforcing rib extends to the power distribution placement area, and the first exhaust channel extends to the power distribution placement area.

10. The housing of the battery pack according to claim 5, characterized in that, The base plate, the side beam, and the reinforcing rib are integrally extruded parts.

11. The housing of the battery pack according to claim 10, characterized in that, The lower housing includes a second flange welded to the top of the side beam, the second flange forming the curved surface.

12. The housing of the battery pack according to claim 1, characterized in that, The side beam is equipped with a second exhaust channel.

13. The housing of the battery pack according to claim 12, characterized in that, The side beam is provided with an explosion-proof valve installation area, which is located on the side of the power distribution placement area, and the second exhaust channel extends to the power distribution placement area.

14. The housing of the battery pack according to any one of claims 1-12, characterized in that, At least a portion of the lower surface of the top cover is provided with a buffer layer.

15. A battery pack, characterized in that, include: The housing of the battery pack according to any one of claims 1-14; A battery cell, wherein there are multiple battery cells, and they are stacked on the battery cell placement area along the thickness direction of the base plate; A power distribution unit, which is installed in the power distribution placement area.

16. The battery pack according to claim 15, characterized in that, The battery cells are multiple and form at least one battery cell group; The battery cell assembly includes at least two core layers stacked along the thickness direction of the base plate, and each core layer includes at least two battery cells arranged along the length direction of the side beam; Two adjacent cells on the same core layer are connected by a first connecting piece, and two adjacent core layers are connected by a second connecting piece, so that multiple cells in the entire cell group are connected in series.

17. The battery pack according to claim 16, characterized in that, The first connecting piece is provided with at least one protruding section, which is bent toward the upper cover or the bottom plate.

18. The battery pack according to claim 16, characterized in that, The second connecting piece includes: Two connecting segments are provided, each extending along the length of the side beam, and the two connecting segments are respectively welded to the two battery cells; The intermediate section connects the ends of the two connecting sections that are furthest from the battery cell.

19. An electrical appliance, characterized in that, Includes the battery pack according to any one of claims 15-18.

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