Battery, battery module and electrical device

Abstract

Provided in the present application are a battery, a battery module and an electrical device. The battery comprises a battery cell and a battery case, wherein the battery cell is located in an accommodating cavity of the battery case and comprises first side surfaces and second side surfaces which are connected to each other, the area of the first side surface being greater than that of the second side surface; the battery case comprises a top cover, a side housing and two first side plates; the top cover is welded to the battery cell; the side housing is welded to the top cover, the side housing comprises a bottom plate and two second side plates, the bottom plate and the top cover are spaced apart in the direction of height of the battery, the two second side plates are spaced apart from each other in the direction of length of the battery, each second side plate has one end connected to the bottom plate and the other end connected to the top cover and is opposite one of the second side surfaces, and the bottom plate, one of the second side plates, the top cover and the other second side plate are sequentially connected to form a main case; and the two first side plates are spaced apart from each other in the direction of width of the battery, the two first side plates respectively abut against the opposite first side surfaces, at least one of the first side plates is welded to the main case, and a weld seam of the first side plate welded to the main case is an annular weld seam.

Description

Batteries, battery modules and electrical equipment

[0001] This application claims priority to Chinese Patent Application No. 202411433515.0, filed on October 14, 2024, entitled "Battery, Battery Module and Electrical Equipment", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of energy storage technology, and in particular to a battery, battery module and electrical equipment. Background Technology

[0003] With the continuous development of renewable energy sources such as wind and solar power, the market demand for batteries with electrochemical energy storage and release capabilities is also increasing. A battery consists of a casing and cells, with the cells installed inside the casing. However, a relatively large gap is usually maintained between the cells and the casing to prevent interference when the cells are installed. But this structure makes it difficult for the cells to withstand external preload, affecting battery performance. Summary of the Invention

[0004] Embodiments of this application provide a battery, a battery module, and an electrical device that enable the battery cell to be preloaded, allowing the battery cell to safely and effectively output electrical energy.

[0005] In a first aspect, this application provides a battery, the battery comprising:

[0006] A battery cell, comprising two first sides and two second sides, wherein the two first sides are spaced apart along the width direction of the battery, and the two second sides are spaced apart along the length direction of the battery, each second side being connected between two first sides, and the area of ​​the first sides being larger than the area of ​​the second sides; and

[0007] A battery casing having a receiving cavity, the battery cell being located within the receiving cavity, the battery casing including a top cover, side shells, and two first side plates;

[0008] The top cover is welded to the battery cell;

[0009] The side shell is welded to the top cover. The side shell includes a bottom plate and two second side plates. The bottom plate and the top cover are spaced apart along the height direction of the battery. The two second side plates are spaced apart along the length direction of the battery. One end of each second side plate is connected to the bottom plate, and the other end of each second side plate is connected to the top cover. Each second side plate is opposite to a second side plate. The bottom plate, one second side plate, the top cover, and the other second side plate are sequentially connected to form the main shell.

[0010] Two first side plates are spaced apart along the width direction of the battery. The two first side plates are respectively arranged opposite to the two first side surfaces, and the two first side plates abut against each other with the oppositely arranged first side surfaces. At least one first side plate is welded to the main housing, and the weld mark of the first side plate welded to the main housing is a ring weld mark.

[0011] Understandably, since the battery casing consists of a top cover, side shells, and two first side plates, and each of these components is an independent structural part, the battery casing has a split structure.

[0012] On the one hand, the split-structure battery casing can be disassembled into multiple parts and assembled together in a layer-by-layer manner, avoiding the problems of excessive extension length, reduced strength, and reduced maintenance convenience caused by using the same structural component for the battery casing, which is beneficial for positioning and assembly.

[0013] On the other hand, the split-structure battery casing allows the battery cells to be welded and fixed to the top cover first during battery assembly, and then the top cover to the side shell, so that the battery cells are located in the area enclosed by the top cover and the side shell. Finally, the two first side plates are welded to the opposite sides of the side shell and the top cover, so that the battery cells are located inside the battery casing, thus realizing the assembly process of first installing the battery cells and then welding them to form the battery casing.

[0014] This assembly method allows the two first side plates to abut against the two first sides of the battery cell, enabling zero-gap assembly between the two first sides of the battery cell and the battery casing. Thus, when the battery is subjected to external forces, the battery casing can transfer the force acting on it to the battery cell, allowing the battery cell to be preloaded and safely and effectively output electrical energy.

[0015] Secondly, this application also provides a battery module, the battery module including the battery as described above, wherein the battery casing is used to contact the battery cell after being subjected to force.

[0016] Thirdly, this application also provides an electrical device, which includes the battery module described above. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application or the background art will be described below.

[0018] Figure 1 is a schematic diagram of the energy storage system provided in an embodiment of this application;

[0019] Figure 2 is a schematic diagram of a battery structure provided in an embodiment of this application;

[0020] Figure 3 is an exploded view of part of the battery structure shown in Figure 2;

[0021] Figure 4 is a structural schematic diagram of the first embodiment of the battery casing provided in this application;

[0022] Figure 5 is an exploded view of the battery casing shown in Figure 4;

[0023] Figure 6 is a schematic diagram of one assembly state of the battery shown in Figure 2;

[0024] Figure 7 is a schematic diagram of one structure of the side shell of the battery casing shown in Figure 4;

[0025] Figure 8 is a schematic diagram of a partial cross-section obtained by cutting along the cutting line AA shown in Figure 7;

[0026] Figure 9 is a schematic diagram of another structure of the side shell of the battery casing shown in Figure 4;

[0027] Figure 10 is a schematic diagram of a partial cross-section obtained by cutting along the cutting line BB shown in Figure 9;

[0028] Figure 11 is a structural schematic diagram of the top cover of the battery casing shown in Figure 4 at one angle;

[0029] Figure 12 is a structural schematic diagram of the side shell of the battery casing shown in Figure 4 at one angle;

[0030] Figure 13 is a partial structural diagram of the battery casing shown in Figure 4, where the side shell and top cover are assembled to form the main casing.

[0031] Figure 14 is a schematic diagram of one structure of the welded part of the battery casing shown in Figure 4;

[0032] Figure 15 is a structural schematic diagram of the first side plate of the battery casing shown in Figure 4 at one angle;

[0033] Figure 16a is a simplified schematic diagram of a battery state provided in the first embodiment of this application;

[0034] Figure 16b is a simplified schematic diagram of another state of the battery provided in the first embodiment of this application;

[0035] Figure 16c is a simplified schematic diagram of another state of the battery provided in the first embodiment of this application;

[0036] Figure 17 is a cross-sectional view of a portion of the structure shown by cutting along the section line CC shown in Figure 4;

[0037] Figure 18 is a structural schematic diagram of the second embodiment of the battery casing provided in this application;

[0038] Figure 19 is a schematic diagram of a structure of the first side panel of the battery casing shown in Figure 18;

[0039] Figure 20 is a schematic cross-sectional view obtained by cutting along the cutting line DD shown in Figure 18;

[0040] Figure 21 is a simplified schematic diagram of a battery state provided in the second embodiment of this application;

[0041] Figure 22 is a simplified cross-sectional view of a portion of the structure of the third embodiment of the battery casing provided in this application;

[0042] Figure 23 is a simplified cross-sectional view of a portion of the structure of the fourth embodiment of the battery casing provided in this application;

[0043] Figure 24 is a structural schematic diagram of the fifth embodiment of the battery casing provided in this application;

[0044] Figure 25 is a partial structural diagram of the side shell of the battery casing shown in Figure 24;

[0045] Figure 26 is a partial structural schematic diagram of the first side panel of the battery casing shown in Figure 24;

[0046] Figure 27 is a schematic cross-sectional view obtained by cutting along the cutting line EE shown in Figure 24;

[0047] Figure 28 is a structural schematic diagram of the sixth embodiment of the battery casing provided in this application;

[0048] Figure 29 is a partial structural diagram of the side shell of the battery casing shown in Figure 28;

[0049] Figure 30 is a partial structural schematic diagram of the first side panel of the battery casing shown in Figure 28;

[0050] Figure 31 is a schematic cross-sectional view obtained by cutting along the cutting line FF shown in Figure 28.

[0051] Reference numerals: Energy storage system 400, power conversion device 410, first user load 420, second user load 430, electrical equipment 300, battery 200, the length direction of battery 200 is the X direction, the width direction of battery 200 is the Y direction, the height direction of battery 200 is the Z direction, battery casing 100, cell assembly 220, insulating film 230, terminal assembly 240, explosion-proof valve assembly 250, top patch 260, outer film 270, cell 280, side shell 10, top cover 20, first side plate 30, protrusion 40, main casing 50, receiving cavity W, bottom plate 11, second side plate 12. The following components are included: pole through hole 21, explosion-proof valve through hole 22, first step structure 23, first step surface 231, second body 121, second connecting part 122, welding part 60, first body 31, first connecting part 32, telescopic part 33, first surface 321, second surface 322, first sub-part 331, second sub-part 332, third sub-part 333, fourth sub-part 334, first corner T1, second corner T2, third corner T3, fourth corner T4, second step structure 123, second step surface 124, groove 24, first side surface 2810, second side surface 2820, connecting edge 125. Detailed Implementation

[0052] For ease of understanding, the terminology used in the embodiments of this application will be explained first.

[0053] And / or: This is simply a way of describing the relationship between related objects. It indicates that there can be three kinds of relationships. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone.

[0054] Multiple: refers to two or more.

[0055] Connection: should be interpreted broadly. For example, the connection between A and B can be a direct connection between A and B, or an indirect connection between A and B through an intermediary.

[0056] The specific embodiments of this application will now be clearly described in conjunction with the accompanying drawings.

[0057] Because the energy we need is highly time- and space-dependent, in order to utilize energy rationally and improve energy efficiency, it is necessary to store one form of energy in the same way or by converting it into another, and then release it in a specific energy form according to future application needs. As we all know, the generation of green electricity currently relies heavily on photovoltaic, wind, and hydropower. However, wind and solar energy are generally characterized by strong intermittency and large fluctuations, which can cause grid instability, insufficient power during peak demand periods, and excessive power during off-peak periods. Unstable voltage can also damage the power grid. Therefore, insufficient electricity demand or insufficient grid capacity can lead to the problem of "wind and solar curtailment." Solving these problems requires energy storage. This involves converting electrical energy into other forms of energy through physical or chemical means and storing it, then releasing the stored energy as electricity when needed. Simply put, energy storage is like a large "power bank," storing electrical energy when photovoltaic and wind power are abundant and releasing the stored electricity when needed.

[0058] Taking electrochemical energy storage as an example, the embodiments of this application provide an electrical device 300, which is equipped with a set of chemical batteries. The main purpose is to use the chemical elements in the chemical batteries as energy storage medium. The charging and discharging process is accompanied by the chemical reaction or change of the energy storage medium. Simply put, the electrical energy generated by wind and solar energy is stored in the chemical batteries. When the use of external electrical energy reaches its peak, the stored electricity is released for use, or it is transferred to places where electricity is scarce for use.

[0059] Current energy storage applications are quite widespread, including generation-side energy storage, grid-side energy storage, renewable energy grid-connected energy storage, and user-side energy storage. The corresponding types of electrical equipment (number 300) include:

[0060] Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the power grid, enabling load matching of electrical energy in time and space, enhancing the absorption capacity of renewable energy, and playing a significant role in grid system backup, alleviating peak load power supply pressure, and peak shaving and frequency regulation.

[0061] Small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios on the user side, and small household energy storage boxes used in residential energy storage scenarios on the user side, mainly operate under the "peak shaving and valley filling" mode. Because there are significant price differences in electricity during peak and off-peak periods based on electricity demand, users typically charge the energy storage cabinet / box during off-peak hours to reduce costs, and then release the electricity from the device during peak hours for use, thus saving on electricity bills. Furthermore, in remote areas and regions prone to natural disasters such as earthquakes and hurricanes, the presence of household energy storage devices effectively provides users with backup power for themselves and the power grid, avoiding the inconvenience caused by frequent power outages due to disasters or other reasons.

[0062] Please refer to Figure 1, which is a schematic diagram of the structure of the energy storage system 400 provided in an embodiment of this application. This embodiment of the application takes a home energy storage scenario in user-side energy storage as an example for illustration, but the electrical equipment 300 in this application is not limited to a home energy storage scenario.

[0063] This application provides an energy storage system 400, which includes a power conversion device 410, a first user load 420, a second user load 430, and an electrical appliance 300. The electrical appliance 300 is a small energy storage box that can be wall-mounted on an outdoor wall. Specifically, photovoltaic panels can convert solar energy into electrical energy during periods of low electricity prices, and the electrical appliance 300 stores this electrical energy to supply streetlights and household appliances during peak electricity prices, or to provide power during power outages.

[0064] The electrical device 300 may include, but is not limited to, individual batteries, battery modules, battery packs, and battery systems. When the electrical device 300 includes multiple batteries, the multiple batteries are electrically connected and all are located inside the casing of the electrical device 300, which protects them from interference from the external environment. Exemplarily, the multiple batteries are arranged at intervals. The multiple batteries can be connected in series, in parallel, or in a combination of series and parallel connections to achieve greater capacity and power. The embodiments of this application use an electrical device 300 including a battery module as an example for illustration, but it should be understood that the electrical device 300 is not limited thereto.

[0065] The battery module may include a battery 200 and an external force device. The external force device may be located around the battery 200 and can apply a force to the battery 200. When the battery casing 100 of the battery 200 is subjected to the force of the external force device, it will abut against the battery cell 280 of the battery 200 to transmit the force of the external force device to the battery cell 280 of the battery 200 and provide a continuous preload force to the battery cell 280 of the battery 200. Multiple batteries 200 may be present, and these batteries may be arranged in an array.

[0066] Of course, in some other embodiments, the battery module may not include an external force device, and this is not strictly limited.

[0067] Please refer to Figures 2 and 3. Figure 2 is a schematic diagram of a battery 200 provided in an embodiment of this application, and Figure 3 is an exploded view of a portion of the structure of the battery 200 shown in Figure 2.

[0068] For ease of description, the length direction of battery 200 is defined as the X direction, the width direction as the Y direction, and the height direction as the Z direction. The X, Y, and Z directions are all perpendicular to each other.

[0069] Battery 200 may include battery casing 100, cell assembly 220, insulating film 230, terminal assembly 240, explosion-proof valve assembly 250, top patch 260, and outer sheath 270. Cell assembly 220 is installed inside battery casing 100. Insulating film 230 is installed inside battery casing 100 and located between cell assembly 220 and battery casing 100, providing insulation between them. Terminal assembly 240 is installed on top cover 20 of battery casing 100 and electrically connected to cell assembly 220 to allow electrode lead-out. Explosion-proof valve assembly 250 is installed on top cover 20 of battery casing 100 and spaced apart from terminal assembly 240, providing pressure relief protection for battery 200. Top patch 260 is affixed to top cover 20 of battery casing 100, preventing top cover 20 from external impact and short circuits with other circuits, providing insulation and protection. The outer film 270 covers the outside of the battery casing 100 and part of the outer edge of the top patch 260, so as to cooperate with the top patch 260 to surround the battery casing 100 and play a role in insulation and protection.

[0070] The battery housing 100 may have two terminal post assemblies 240, which are spaced apart on the top cover 20 of the battery housing 100 and serve as the positive and negative terminal post assemblies, respectively. An explosion-proof valve assembly 250 may be disposed between the two terminal post assemblies 240. The cell assembly 220 may include multiple cells 280, which may be connected in series, in parallel, or a combination of both. The arrangement of multiple cells 280 increases the battery capacity of the energy storage device, allowing the battery to be used for a longer period and thus expanding its applicability. For example, the battery cells 280 may be two, arranged sequentially along the Y direction. The battery housing 100 may be a metal housing, such as an aluminum housing. However, the battery housing 100 may also be made of other materials.

[0071] The battery cell 280 may include two first sides 2810 and two second sides 2820. The two first sides 2810 may be spaced apart along the width direction (Y direction in the figure) of the battery 200. The two second sides 2820 may be spaced apart along the length direction (X direction in the figure) of the battery 200. Each second side 2820 is connected between two first sides 2810. The area of ​​the first side 2810 is larger than the area of ​​the second side 2820. That is, the first side 2810 is the larger surface of the battery cell 280.

[0072] It should be noted that Figures 2 and 3 are intended only to schematically illustrate the connection relationships of the battery casing 100, cell assembly 220, insulating film 230, terminal assembly 240, explosion-proof valve assembly 250, top patch 260, and outer film 270, and are not intended to specifically limit the connection positions, specific structures, or quantities of each device. Furthermore, the structures illustrated in the embodiments of this application do not constitute a specific limitation on the battery 200. In other embodiments of this application, the battery 200 may include more or fewer components than those shown in Figures 2 and 3, or combine certain components, or split certain components, or have different component arrangements. The components shown in Figures 2 and 3 can be implemented in hardware, software, or a combination of both.

[0073] Understandably, during the operation of a battery cell, it undergoes charging and discharging cycles, generating expansion forces and causing it to expand. To avoid adverse effects on the battery due to cell expansion, a certain pre-tightening force is typically applied to the cell using the battery casing to resist and mitigate the expansion forces. In related technologies, to prevent the battery casing, which is packaged outside the cell, from cracking due to cell expansion, the pre-tightening force that can be applied to the battery casing needs to be reduced when the cell is installed to ensure the safety of the battery casing. However, reducing the pre-tightening force of the battery casing can also lead to an increase in the gap between the cell and the battery casing, making it easier for the inner walls of the cell and the battery casing to collide and vibrate, affecting the safe output of electrical energy from the cell. Furthermore, for batteries with high pre-tightening requirements, in order to shorten the transport distance of active ions and reduce the internal resistance of the battery, the pre-tightening force needs to be increased to ensure tight contact of the electrode components inside the battery.

[0074] Based on this, embodiments of this application provide a battery casing 100 that can release and resist the expansion force generated by the battery cell 280 when the battery cell 280 expands, providing a pre-tightening force to the battery cell 280 and improving the situation where the battery cell 280 is prone to misalignment, displacement, or detachment from the battery casing. Furthermore, the increased pre-tightening force ensures tighter contact between the battery cell assembly 220 and the terminal assembly 240 within the battery 200, improving the charging and discharging performance of the battery 200.

[0075] The following six embodiments will be used to describe the specific structure of the battery casing 100 provided in the embodiments of this application.

[0076] First embodiment:

[0077] Please refer to Figures 4 and 5. Figure 4 is a structural schematic diagram of the first embodiment of the battery casing 100 provided in this application, and Figure 5 is an exploded schematic diagram of the battery casing 100 shown in Figure 4.

[0078] The battery casing 100 may include a side shell 10, a top cover 20, and two first side plates 30. The top cover 20 is welded to the battery cell 280. The side shell 10 and the top cover 20 are welded together to form the main casing 50 of the battery casing 100. The main casing 50 is hollow and annular, and has two openings. One opening of the main casing 50 is located at one end of the width direction of the main casing 50, and the other opening of the main casing 50 is located at the other end of the width direction of the main casing 50. The two first side plates 30 are respectively located on both sides of the width direction (i.e., the Y direction) of the main casing 50, and are arranged opposite to each other and spaced apart. One first side plate 30 closes one opening of the main casing 50, and the other first side plate 30 closes the other opening of the main casing 50. The first side plate 30 is the largest plate in terms of area among all the plates of the battery casing 100, and may also be referred to as the large surface of the battery casing 100. Each first side plate 30 is arranged opposite to a first side surface 2810 of the battery cell 280 and is used to abut against a first side surface 2810 of the battery cell 280. That is, the two first side plates 30 are respectively disposed opposite to the two first side surfaces 2810 of the battery cell 280, and the two first side plates 30 respectively abut against the first side surfaces 2810 of the battery cell 280 disposed opposite to each other. The side shell 10, the top cover 20 and the two first side plates 30 enclose to form the receiving cavity W of the battery casing 100, which can be used to accommodate other structural components in the battery 200 such as the battery cell 280 and the insulating film 230.

[0079] Specifically, the side shell 10 may include a base plate 11 and two second side plates 12. The base plate 11 and the top cover 20 may be spaced apart in the height direction (i.e., the Z direction) of the main shell 50. The two second side plates 12 are connected between the base plate 11 and the top cover 20 and are spaced apart in the length direction (i.e., the X direction) of the main shell 50. That is, one end of each second side plate 12 is connected to the base plate 11, and the other end of each second side plate 12 is connected to the top cover 20. Each second side plate 12 is disposed opposite to a second side surface 2820 of the battery cell 280 and is used to abut against a second side surface 2820 of the battery cell 280. The base plate 11, one second side plate 12, the top cover 20, and the other second side plate 12 are sequentially connected to form the main shell 50. The main shell 50 is welded to at least one first side plate 30, and the weld mark of the first side plate 30 welded to the main shell 50 is a ring weld mark. On the base plate 11 and the top cover 20, the second side plate 12 and the first side plate 30 may be arranged alternately. Exemplarily, the weld marks of the first side plate 30, which is welded to the main housing 50, can be prepared by a one-time forming process. That is, the weld marks of the first side plate 30, which is welded to the main housing 50, are one-time formed annular weld marks.

[0080] Before the battery 200 is assembled and formed, the two first side plates 30 abut against the first side surface 2810 of the oppositely arranged battery cell 280. And / or, when the battery 200 is fully discharged, the two first side plates 30 abut against the first side surface 2810 of the oppositely arranged battery cell 280. The side shell 10 can be a one-piece structure. That is, the base plate 11 and the two second side plates 12 are connected to form a one-piece structure. For example, the shape of the side shell 10 can be U-shaped. The base plate 11 and the two second side plates 12 can be a one-piece structure formed by assembly methods such as welding or bonding. Alternatively, the base plate 11 and the two second side plates 12 can also be a one-piece structure formed by a method such as integral molding. In some other embodiments, one of the two first side plates 30 can be connected to the side shell 10 by a method such as integral molding to form a one-piece structure.

[0081] It is understandable that, since the battery casing 100 is composed of a top cover 20, a side shell 10, and two first side plates 30, and the top cover 20, side shell 10, and two first side plates 30 are all independent structural components, the battery casing 100 has a split structure.

[0082] On the one hand, the split-structure battery casing 100 can be disassembled into multiple parts and assembled together by layer-by-layer assembly. This avoids the problems of excessive extension length, reduced strength, and reduced maintenance convenience caused by using the same structural component for the battery casing 100, and is beneficial for positioning and assembly.

[0083] On the other hand, the split-structure battery casing 100 allows for the following assembly steps during battery 200 assembly: first, the battery cell 280 is welded to the top cover 20; then, the top cover 20 is welded to the side shell 10, so that the battery cell 280 is located within the area enclosed by the top cover 20 and the side shell 10; finally, two first side plates 30 are welded to the opposite sides of the side shell 10 and the top cover 20, so that the battery cell 280 is located inside the battery casing 100. This achieves the assembly process of first installing the battery cell 280 and then welding it to form the battery casing 100.

[0084] This assembly method allows the two first side plates 30 to abut against the two first side plates 2810 of the cell 280 respectively, enabling zero-gap assembly between the two first side plates 2810 of the cell 280 and the battery casing 100. Thus, when the battery 200 is subjected to external forces, the battery casing 100 can transfer the forces acting on it to the cell 280, allowing the cell 280 to be preloaded and to safely and effectively output electrical energy.

[0085] In one possible application scenario, please refer to Figure 6, which is a schematic diagram of one assembly state of the battery shown in Figure 2.

[0086] The assembly process of battery 200 may include at least the following steps:

[0087] Step 1: Weld the cell assembly 220 to the top cover 20 on which the terminal assembly 240 is installed. The top cover 20 is welded to the cell 280.

[0088] Step 2: Wrap an insulating film 230 around the cell assembly 220 so that the insulating film 230 surrounds the cell assembly 220.

[0089] Step 3: Weld the side shell 10 to the top cover 20 so that the battery cell 280 is located in the area enclosed by the top cover 20 and the side shell 10.

[0090] Step 4: Weld the two first side plates 30 to both sides of the side shell 10 and the top cover 20, so that the battery cell 280 is located inside the battery casing 100.

[0091] Step 5: Apply an outer film 270 to the outer periphery of the battery casing 100 so that the outer film 270 covers the side shell 10, the two first side plates 30 and part of the top cover 20.

[0092] Step 6: Attach the top patch 260 to the top cover 20 so that the top patch 260 covers the top cover 20 and part of the outer film 270.

[0093] In this embodiment, the battery casing 100 may further include a plurality of protrusions 40. The plurality of protrusions 40 are spaced apart on the side shell 10 and protrude relative to the inner surface of the side shell 10. The plurality of protrusions 40 are used to connect with the battery cell 280 to provide preload to the battery cell 280. The inner surface of the side shell 10 is the surface of the side shell 10 facing the receiving cavity W. The plurality of protrusions 40 may be spaced apart on the base plate 11 and / or the two second side plates 12 and are used to contact the battery cell 280. Specifically, the plurality of protrusions 40 may be spaced apart on the base plate 11 and protrude relative to the surface of the base plate 11 facing the receiving cavity W, and are used to contact the battery cell 280. Alternatively, the plurality of protrusions 40 may be spaced apart on the two second side plates 12 and protrude relative to the surfaces of the two second side plates 12 facing the receiving cavity W, and are used to contact the battery cell 280. Alternatively, a plurality of protrusions 40 may be spaced apart on the base plate 11 and the two second side plates 12, and protrude toward the surface of the receiving cavity W relative to the base plate 11 and the two second side plates 12, and are used to contact the battery cell 280.

[0094] Firstly, by providing multiple protrusions 40 and enabling these protrusions 40 to protrude relative to the base plate 11 and / or the two second side plates 12 toward the surface of the receiving cavity W, the multiple protrusions 40 can cooperate to restrict the movement of the battery cell 280 within the battery casing 100, thus playing a good limiting role. This effectively prevents the battery cell 280 from shifting within the battery casing 100, which could lead to the preload in the base plate 11 and / or the two second side plates 12 not being fully transmitted to the battery cell 280, resulting in a reduction in the capacity of the battery cell 280.

[0095] Secondly, by providing multiple protrusions 40 and distributing them on the base plate 11 and / or the two second side plates 12 for contact with the battery cell 280, a small gap or no gap can be formed between the side of the battery cell 280 that is opposite to the base plate 11 and / or the two second side plates 12 and the battery casing 100, thereby achieving zero gap on the battery side and improving the stability and reliability of the battery.

[0096] Thirdly, by setting multiple protrusions 40 and distributing them on the base plate 11 and / or the two second side plates 12 for contact with the battery cell 280, the multiple protrusions 40 can cooperate to position and hold the battery cell 280 and apply a preload force to it. This allows the multiple protrusions 40 to transfer the preload force from the side shell 10 to the battery cell 280 when it expands due to multiple charge-discharge cycles, providing a certain preload force to resist the expansion force generated by the battery cell 280. Simultaneously, it also allows space for the battery cell 280 to expand in the thickness direction, ensuring that the preload force applied to the battery cell 280 and the expansion of the battery cell 280 do not interfere with each other. The battery cell 280 can safely and effectively output electrical energy, effectively preventing problems caused by excessive restraint force affecting the internal structure and state of the battery cell 280, slowing down battery aging, and improving battery performance and lifespan.

[0097] The following description will use the example of multiple protrusions 40 spaced apart on the base plate 11 and two second side plates 12, but it should be understood that this is not the only explanation.

[0098] In one possible implementation, please refer to Figures 7 and 8. Figure 7 is a structural schematic diagram of the side shell 10 of the battery casing 100 shown in Figure 4, and Figure 8 is a partial cross-sectional schematic diagram obtained by cutting along the cutting line AA shown in Figure 7.

[0099] Multiple protrusions 40 may all be located within the receiving cavity W. One end of the protrusion 40 on the base plate 11 is connected to the surface of the base plate 11 facing the receiving cavity W, and the other end of the protrusion 40 on the base plate 11 is used to contact the battery cell 280. One end of the protrusion 40 on the second side plate 12 is connected to the surface of the second side plate 12 facing the receiving cavity W, and the other end of the protrusion 40 on the second side plate 12 is used to contact the battery cell 280. The multiple protrusions 40 can be connected to the base plate 11 and the second side plate 12 by assembly methods such as bonding or welding to form an integral structure. For example, the material of the protrusions 40 can be plastic. Plastic protrusions can be bonded to the base plate 11 or the second side plate 12 with adhesive. Alternatively, the material of the protrusions 40 can be metal. Metal protrusions can be welded to the base plate 11 or the second side plate 12.

[0100] It is understandable that by locating multiple protrusions 40 within the receiving cavity W, the multiple protrusions 40 can limit the movement of the battery cell 280 and apply a pre-tightening force to the battery cell 280, thereby maintaining a certain distance between the battery cell 280 and the base plate 11 and / or the second side plate 12. This avoids the problem of the battery cell 280 shifting due to friction between the battery cell 280 and the base plate 11 and / or the second side plate 12, resulting in better reliability.

[0101] In another possible implementation, please refer to Figures 9 and 10. Figure 9 is a schematic diagram of another structure of the side shell 10 of the battery casing 100 shown in Figure 4, and Figure 10 is a schematic diagram of a partial cross-section obtained by cutting along the cutting line BB shown in Figure 9.

[0102] At least a portion of each of the plurality of protrusions 40 may be located within the receiving cavity W. The protrusions 40 provided on the base plate 11 not only protrude from the surface of the base plate 11 facing the receiving cavity W, but also are recessed from the surface of the base plate 11 facing away from the receiving cavity W. The protrusions 40 provided on the second side plate 12 not only protrude from the surface of the second side plate 12 facing the receiving cavity W, but also are recessed from the surface of the second side plate 12 facing away from the receiving cavity W. The plurality of protrusions 40 can be connected to the base plate 11 and the second side plate 12 in a one-piece structure, such as by integral molding. Exemplarily, the material of the protrusions 40 may be metal. The metal protrusions can be attached to the base plate 11 or the second side plate 12 by a stamping process.

[0103] It is understood that by making the multiple protrusions 40 protrude from the surfaces of the base plate 11 and the second side plate 12 toward the receiving cavity W, and recess from the surfaces of the base plate 11 and the second side plate 12 away from the receiving cavity W, the protrusions 40 can be made into a hollow structure. This allows the multiple protrusions 40 to be manufactured with less material while having sufficient strength to limit the movement of the battery cell 280 and apply a pre-tightening force to the battery cell 280. This can save on the material and production costs required to manufacture the multiple protrusions 40, and facilitate the improvement of the production efficiency of the battery casing 100.

[0104] Based on the above description, it should be understood that the multiple protrusions 40 can be configured as solid or hollow structures as needed. The characteristic parameters of the protrusions 40, such as their placement, spacing between adjacent protrusions 40, shape, length, width, and protrusion height relative to the base plate 11 or the second side plate 12 towards the receiving cavity W, can be selected according to the actual application of the multiple protrusions 40. This embodiment does not impose strict limitations on this.

[0105] Please refer to Figure 11, which is a structural schematic diagram of the top cover 20 of the battery casing 100 shown in Figure 4 at one angle.

[0106] The top cover 20 may have pole post through holes 21 and explosion-proof valve through holes 22. There may be two pole post through holes 21, spaced apart along the length of the top cover 20. Each pole post through hole 21 penetrates the top cover 20 along its thickness and is used to install a pole post assembly 240. The explosion-proof valve through hole 22 may be located between the two pole post through holes 21 and spaced apart from them. The explosion-proof valve through hole 22 penetrates the top cover 20 along its thickness and is used to install an explosion-proof valve assembly 250.

[0107] The top cover 20 may also have a first step structure 23. The first step structure 23 is located at the end of the top cover 20 along its length. The first step structure 23 may have a first step surface 231, which is parallel to the XY plane. The first step surface 231 may be recessed relative to the surface of the top cover 20 facing away from the side shell 10, and is positioned facing away from the side shell 10, and is used to overlap with a portion of the second side plate 12. There may be two first step structures 23, with the two first step structures 23 located at opposite ends of the top cover 20 along its length.

[0108] Please refer to Figure 12, which is a structural schematic diagram of the side shell 10 of the battery casing 100 shown in Figure 4 at one angle.

[0109] The base plate 11 can extend along the X direction, and its two ends along the X direction are respectively connected to two second side plates 12. The second side plates 12 may include a second body 121 and a second connecting portion 122. One end of the second body 121 is connected to the base plate 11, and the other end of the second body 121 can extend along the Z direction. One end of the second connecting portion 122 is connected to the end of the second body 121 away from the base plate 11, and the other end of the second connecting portion 122 extends away from the second body 121. The second connecting portion 122 can be bent away from the receiving cavity W. That is, the second connecting portion 122 is bent and connected to the end of the second body 121 away from the base plate 11. The second connecting portion 122 can be used to connect to the top cover 20. Exemplarily, the shape of the second connecting portion 122 can be arc-shaped.

[0110] The following description will use the assembly of a first step structure 23 and a second connecting part 122 as an example to illustrate the assembly of the top cover 20 and the second side plate 12. Unless otherwise specified, the following description of the assembly of a first step structure 23 and a second connecting part 122 can be applied to the assembly of another first step structure 23 and a second connecting part 122.

[0111] Please refer to Figure 13, which is a partial structural diagram of the assembly of the side shell 10 and top cover 20 of the battery casing 100 shown in Figure 4 to form the main casing 50.

[0112] When the side shell 10 and the top cover 20 are assembled to form the main shell 50, a portion of the second connecting part 122 of the second side plate 12 overlaps with the first step structure 23 of the top cover 20 and is welded to the first step structure 23 so that the top cover 20 and the second side plate 12 are fixedly connected.

[0113] Understandably, by having a portion of the second connecting part 122 of the second side plate 12 overlap the first step structure 23 of the top cover 20, the connection boundary between the second side plate 12 and the top cover 20 can be exposed. This allows for the use of a seam welding process to weld the top cover 20 and the second side plate 12 together along the connection boundary between the first step structure 23 and the second connecting part 122. Simultaneously, the welding slag generated during welding is blocked by the first step structure 23, preventing it from falling into the battery casing 100 and causing a short circuit in the cell assembly 220 located inside the battery casing 100, thus improving the safety performance of the battery 200. Furthermore, compared to traditional through-welding connection methods, seam welding offers higher detectability and welding quality, avoiding incomplete welds. This results in a more reliable connection between the top cover 20 and the second side plate 12, ensuring a stable electrical connection between the cell assembly 220 and the terminals, thereby guaranteeing safety and ensuring the battery 200 can charge and discharge normally.

[0114] In this embodiment, the first side plate 30 is connected to the top cover 20 and the side shell 10. That is, the first side plate 30 is connected to the top cover 20, the two second side plates 12, and the bottom plate 11. In other words, the first side plate 30 is connected to the main shell 50. The first side plate 30 can be sealed and connected to the main shell 50 through full-circumference side welding, and the weld must overlap and not interfere with the weld between the top cover 20 and the second side plate 12. Alternatively, the first side plate 30 can also be connected and sealed to the main shell 50 through laser penetration welding.

[0115] In one possible implementation, please refer to FIG14, which is a structural schematic diagram of the welded portion 60 of the battery casing 100 shown in FIG4.

[0116] The battery casing 100 may also include a welded portion 60. The first side plate 30 can be sealed to the main casing 50 via the welded portion 60, which can be arranged around the outer edge of the main casing 50. That is, the welded portion 60 connects the first side plate 30 and the main casing 50 and is arranged in a complete circle. For example, the material of the welded portion 60 can be solder.

[0117] It is understandable that by welding the first side plate 30 to the main housing 50 around the entire circle, cracks and damage are less likely to occur at the weld seam between the first side plate 30 and the main housing 50, making the welded connection between the first side plate 30 and the main housing 50 strong, with a high welding yield, and also helping to improve the sealing performance of the first side plate 30 and the main housing 50.

[0118] In this embodiment, please refer to FIG15, which is a structural schematic diagram of the first side plate 30 of the battery casing 100 shown in FIG4 at an angle.

[0119] The following description will take the assembly of a first side plate 30 and the main housing 50 as an example. Unless otherwise specified, the description of the assembly of one first side plate 30 and the main housing 50 can be applied to the assembly of another first side plate 30 and the main housing 50.

[0120] The first side plate 30 can be disposed opposite to the large surface of the battery cell 280. The large surface of the battery cell 280 is the surface with the largest area in the battery cell 280, i.e., the first side surface 2810 of the battery cell 280. The first side plate 30 may include a first body 31, a first connecting portion 32, and a telescopic portion 33. The first body 31 can be the central region of the first side plate 30, the first connecting portion 32 can be the edge region of the first side plate 30, and the telescopic portion 33 can be the transition region of the first side plate 30 connecting the first body 31 and the first connecting portion 32. The first side plate 30 can be any material that can meet welding requirements, achieve shrinkage recovery, and spring back when necessary. For example, the material of the first side plate 30 can be aluminum, carbon steel (such as SPCC), stainless steel (such as SUS304, SUS316, etc.), etc.

[0121] The first body 31 is used to abut against the first side 2810 of the battery cell 280. The first body 31 may be disposed opposite to the center of the first side 2810 of the battery cell 280. For example, the first body 31 may be rectangular.

[0122] The first connecting portion 32 may be located around the periphery of the telescopic portion 33 and be arranged around the first body 31 in the circumferential direction. The first connecting portion 32 may be arranged opposite to the edge of the first side surface 2810 of the battery cell 280. The first connecting portion 32 may include a first surface 321 and a second surface 322. The first surface 321 is the surface of the first connecting portion 32 facing the main housing 50, and the second surface 322 is the surface of the first connecting portion 32 facing away from the main housing 50. The first surface 321 and the second surface 322 are arranged opposite to each other in the thickness direction of the first connecting portion 32.

[0123] The first connecting portion 32 and the first body 31 can be arranged sequentially in a direction perpendicular to the first body 31. In other words, in the direction perpendicular to the first body 31, the distance between the first connecting portion 32 and the main housing 50 is less than the distance between the first body 31 and the main housing 50.

[0124] The first connecting part 32 can be used to weld to the main housing 50, that is, the first connecting part 32 can be used to weld to the top cover 20 and the side shell 10, that is, the first connecting part 32 can be used to weld to the top cover 20, the bottom plate 11 and the two second side plates 12. When the first connecting part 32 is welded to the main housing 50, the first surface 321 of the first connecting part 32 contacts the main housing 50.

[0125] The telescopic portion 33 may be located on the periphery of the first body 31 and bends to connect between the outer edge of the first body 31 and the inner edge of the first connecting portion 32. The telescopic portion 33 may be arranged around the first body 31 in the circumferential direction. In the direction perpendicular to the first body 31, at least a portion of the telescopic portion 33 is located between the first body 31 and the first connecting portion 32.

[0126] The telescopic portion 33 has certain elongation and contraction properties, which allows the first body 31 to move relative to the first connecting portion 32 in a direction perpendicular to the first body 31 (i.e., reciprocating movement). Specifically, the telescopic portion 33 can cause the first body 31 to rise relative to the first connecting portion 32 and move away from the first connecting portion 32 to accommodate the expansion of the battery cell 280. Alternatively, the telescopic portion 33 can cause the first body 31 to descend relative to the first connecting portion 32 and move closer to the first connecting portion 32 to accommodate the contraction of the battery cell 280.

[0127] It is understandable that by providing a retractable telescopic portion 33 between the first body 31 and the first connecting portion 32, a height difference can be created between the first body 31 located in the central region of the first side plate 30 and the first connecting portion 32 located in the edge region of the first side plate 30. This stepped height difference provides expansion space for the expansion of the battery cell 280, and the first body 31 can move in a direction perpendicular to the first body 31 along with the expansion of the battery cell 280 through the telescopic performance of the telescopic portion 33, which is beneficial for the battery cell 280 to be able to apply a preload. When the battery cell 280 is charging or aging, the expansion at the center of the first side surface 2810 of the battery cell 280 will be greater than the expansion at the edge of the first side surface 2810 of the battery cell 280, causing the first body 31 to bulge due to the center of the first side surface 2810 of the battery cell 280. At this time, the telescopic portion 33 is pulled open by the first body 31, forming a structure with a larger angle.

[0128] In other words, the telescopic portion 33 not only provides sufficient space for the expansion of the cell 280, but also provides a suitable preload force for the cell 280 in real time to regulate the pressure on the first side 2810 of the cell 280. When the gas generated by the cell 280 increases sharply, the extension of the telescopic portion 33 can provide buffer space for the rapidly increasing gas, ensuring the normal opening of the explosion-proof valve assembly 250, improving safety performance. Furthermore, there is no need to install additional buffer pads or buffer sheets inside the battery casing 100, reducing the cost of the battery casing 100. In addition, for batteries 200 with high preload requirements, the preload force can be increased to ensure close contact between the cell assembly 220 and the terminal assembly 240 inside the battery 200, shortening the transmission distance of active ions, reducing the internal resistance of the battery 200, and improving the charging and discharging performance of the battery 200.

[0129] As shown in Figure 12, in this embodiment, the maximum retraction depth of the telescopic portion 33 can be less than the distance H between the protrusion 40 and the connecting edge 125 of the second side plate 12 in the direction perpendicular to the first body 31. The connecting edge 125 of the second side plate 12 can be connected to the first side plate 30 and spaced apart from the protrusion 40. For example, there can be two connecting edges 125, spaced apart in the width direction (Y direction in the figure) of the second side plate 12.

[0130] It is understandable that when the telescopic part 33 is recessed relative to the side shell 10, since the maximum contraction depth of the telescopic part 33 is less than the distance H between the protrusion 40 and the connecting edge 125 of the second side plate 12 in the direction perpendicular to the first body 31, the telescopic movement of the telescopic part 33 will not interfere with the protrusion 40. This avoids the problem of the telescopic part 33 moving to the side and contacting the protrusion 40, which would cause the protrusion 40 and the telescopic part 33 to interfere with each other and affect the welding, as well as the problem of the telescopic part 33 abutting against the battery cell 280 and affecting the battery cell 280. The reliability is better.

[0131] Please refer to Figures 16a, 16b and 16c. Figure 16a is a schematic diagram of one state of the battery 200 provided in the first embodiment of this application, Figure 16b is a schematic diagram of another state of the battery 200 provided in the first embodiment of this application, and Figure 16c is a schematic diagram of yet another state of the battery 200 provided in the first embodiment of this application.

[0132] In this embodiment, the telescopic part 33 can have an initial state, a first state, and a second state. As shown in FIG16a, the initial state of the telescopic part 33 is the initial state in which the battery cell 280 is not charging or discharging. As shown in FIG16b, the first state of the telescopic part 33 is the fully charged state. As shown in FIG16c, the second state of the telescopic part 33 is the fully discharged state.

[0133] When the telescopic part 33 is in the first state, it is extended, and the minimum distance between the first connecting part 32 and the first body 31 in the direction perpendicular to the first body 31 is the first distance D1. When the telescopic part 33 is in the second state, it is retracted, and the minimum distance between the first connecting part 32 and the first body 31 in the direction perpendicular to the first body 31 is the second distance D2, which is less than the first distance D1.

[0134] It is understandable that during the charging and discharging process of cell 280, the thickness of cell 280 will expand to increase the thickness of cell 280 or shrink to decrease the thickness of cell 280 depending on the amount of charge or discharge.

[0135] Therefore, when the battery cell 280 expands, it thickens, and the telescopic portion 33 is elongated by the first body 31 fixed to the battery cell 280. At this time, the first body 31 expands outward and moves away from the first connecting portion 32, so that the first body 31 and the first connecting portion 32 have a large distance in the direction perpendicular to the first body 31, thereby releasing the expansion force of the battery cell 280, providing expansion space for the expansion of the battery cell 280, and continuously applying a good anti-expansion effect to the expansion of the battery cell 280, so that the tensile strength of the first side plate 30 can withstand the expansion of the battery cell 280.

[0136] When the cell 280 expands and then contracts, its thickness decreases, and the telescopic portion 33 is brought together by the first body 31 fixed to the cell 280. At this time, the first body 31 contracts inward and approaches the first connecting portion 32, resulting in a small distance between the first body 31 and the first connecting portion 32 in the direction perpendicular to the first body 31. The first side plate 30 can still provide good pre-tightening force to the cell 280, ensuring a tight and stable connection between the first side plate 30 and the cell 280. In summary, by changing the state of the telescopic portion 33, the pre-tightening force of the cell 280 can be controlled, and the expansion force of the cell 280 can be effectively resisted, thus ensuring the service life performance of the battery casing 100.

[0137] Please refer to Figure 17, which is a cross-sectional view of a portion of the structure shown by cutting along the section line CC shown in Figure 4.

[0138] In this embodiment, the telescopic part 33 may include a first sub-part 331, a second sub-part 332, a third sub-part 333, and a fourth sub-part 334.

[0139] One end of the first sub-part 331 can be bent and connected to the first connecting part 32, and the other end of the first sub-part 331 can be bent and connected to one end of the second sub-part 332. The first sub-part 331 can extend from the first connecting part 32 in a direction away from the first body 31 and is located on the side of the first connecting part 32 away from the first body 31, that is, the first sub-part 331 can be located on one side of the first surface 321 of the first connecting part 32.

[0140] The other end of the second sub-part 332 can be bent and connected to one end of the third sub-part 333. The second sub-part 332 can be arranged parallel to the first connecting part 32 and located on the side of the first connecting part 32 away from the first body 31, that is, the second sub-part 332 can be located on the side of the first surface 321 of the first connecting part 32.

[0141] The other end of the third sub-part 333 can be bent and connected to one end of the fourth sub-part 334. The third sub-part 333 can be perpendicular to the second sub-part 332. Part of the third sub-part 333 can be located on the side of the first connecting part 32 away from the first body 31, and part of the third sub-part 333 can be located on the side of the first connecting part facing the first body 31. That is, part of the third sub-part 333 can be located on one side of the first surface 321 of the first connecting part 32, and part of the third sub-part 333 can be located on one side of the second surface 322 of the first connecting part.

[0142] The other end of the fourth sub-part 334 can be bent and connected to the first body 31. When the telescopic part 33 is in the second state, the second sub-part 332 and the third sub-part 333 can be elongated. For example, the telescopic part 33 can extend in a Z-shape.

[0143] It is understandable that by positioning part of the telescopic portion 33 on the side of the first connecting portion 32 facing the first body 31 and part of the telescopic portion 33 on the side of the first connecting portion 32 facing away from the first body 31, the telescopic portion 33 can be folded between the first body 31 and the first connecting portion 32. This facilitates the telescopic portion 33 to adapt to the expansion trend of the battery cell 280 and be easily pulled open when the battery cell 280 expands. It also allows the telescopic portion 33 to better adapt to the deformation of the first side plate 30 as it expands and contracts with the battery cell 280, thus avoiding the problem of the first side plate 30 breaking due to plastic strain.

[0144] In this embodiment, the telescopic portion 33 may have a first corner T1, a second corner T2, and a third corner T3 arranged sequentially. The first corner T1 bends towards the receiving cavity W. The second corner T2 bends towards the receiving cavity W, and the bending direction of the second corner T2 is different from the bending direction of the first corner T1. The third corner T3 bends away from the receiving cavity W. By providing multiple corners on the telescopic portion 33, the telescopic portion 33 can have sufficient line length to meet the elongation space required for the expansion of the battery cell 280.

[0145] Second embodiment:

[0146] Please refer to Figures 18, 19, 20, and 21. Figure 18 is a structural schematic diagram of the second embodiment of the battery casing 100 provided in this application. Figure 19 is a structural schematic diagram of the first side plate 30 of the battery casing 100 shown in Figure 18. Figure 20 is a cross-sectional schematic diagram obtained by cutting along the cutting line DD shown in Figure 18. Figure 21 is a simplified schematic diagram of the state of the battery 200 provided in the second embodiment of this application.

[0147] In this embodiment, the contents that are the same as in the first embodiment will not be repeated. The difference from the first embodiment is that the structure of the telescopic portion 33 of the first side plate 30 is different. In addition, the description of the battery casing 100 below can be applied to the first embodiment above unless otherwise specified.

[0148] The telescopic part 33 may include a first sub-part 331, a second sub-part 332, a third sub-part 333, and a fourth sub-part 334.

[0149] One end of the first sub-part 331 can be bent and connected to the first connecting part 32, and the other end of the first sub-part 331 can be bent and connected to one end of the second sub-part 332. The first sub-part 331 can extend from the first connecting part 32 in a direction away from the first body 31 and is located on the side of the first connecting part 32 away from the first body 31, that is, the first sub-part 331 can be located on one side of the first surface 321 of the first connecting part 32.

[0150] The other end of the second sub-part 332 can be bent and connected to one end of the third sub-part 333, and the extension direction of the second sub-part 332 can be inclined to the first connecting part 32. The second sub-part 332 can extend from the other end of the first sub-part 331 toward the first body 31. The second sub-part 332 can be located on the side of the first connecting part 32 away from the first body 31, that is, the second sub-part 332 can be located on one side of the first surface 321 of the first connecting part 32.

[0151] The other end of the third sub-part 333 is bent and connected to one end of the fourth sub-part 334. At least a portion of the third sub-part 333 may be located on the side of the first connecting part 32 facing the first body 31, that is, at least a portion of the third sub-part 333 may be located on one side of the second surface 322 of the first connecting part 32. The included angle between the third sub-part 333 and the second sub-part 332 may be greater than the included angle between the second sub-part 332 and the first sub-part 331.

[0152] The other end of the fourth sub-part 334 is connected to the first body 31. The fourth sub-part 334 is parallel to the first body 31 and is coplanar with the first body 31. When the telescopic part 33 is in the second state, the third sub-part 333 and the fourth sub-part 334 can be stretched.

[0153] It is understandable that by positioning part of the telescopic portion 33 on the side of the first connecting portion 32 facing the first body 31 and part of the telescopic portion 33 on the side of the first connecting portion 32 facing away from the first body 31, the telescopic portion 33 can be folded between the first body 31 and the first connecting portion 32. This facilitates the telescopic portion 33 to adapt to the expansion trend of the battery cell 280 and be easily pulled open when the battery cell 280 expands. It also allows the telescopic portion 33 to better adapt to the deformation of the first side plate 30 as it expands and contracts with the battery cell 280, thus avoiding the problem of the first side plate 30 breaking due to plastic strain.

[0154] The telescopic section 33 may have a first corner T1, a second corner T2, and a third corner T3 arranged sequentially. The first corner T1 bends towards the receiving cavity W. The second corner T2 bends towards the receiving cavity W, and the bending direction of the second corner T2 is different from that of the first corner T1. The third corner T3 bends away from the receiving cavity W. By providing multiple corners on the telescopic section 33, the telescopic section 33 can have sufficient length to meet the elongation space required for the expansion of the battery cell 280.

[0155] Third embodiment:

[0156] Please refer to Figure 22, which is a schematic cross-sectional view of a portion of the structure of the battery casing 100 according to the third embodiment of this application.

[0157] In this embodiment, the contents that are the same as in the first embodiment will not be repeated. The difference is that the structure of the telescopic portion 33 of the first side plate 30 is different from that in the first embodiment. In addition, the description of the battery casing 100 below can be applied to the first and second embodiments above, unless otherwise specified.

[0158] The telescopic part 33 may include a first sub-part 331, a second sub-part 332 and a third sub-part 333.

[0159] One end of the first sub-part 331 can be connected to the first connecting part 32, and the other end of the first sub-part 331 can be bent and connected to one end of the second sub-part 332. The first sub-part 331 is parallel to the first connecting part 32 and is coplanar with the first connecting part 32.

[0160] The other end of the second sub-part 332 can be bent and connected to one end of the third sub-part 333. The second sub-part 332 can extend in an S-shape and be located on the side of the first connecting part 32 facing the first body 31, that is, the second sub-part 332 can be located on the side of the second surface 322 of the first connecting part 32.

[0161] The other end of the third sub-part 333 is connected to the first body 31. The third sub-part 333 is parallel to the first body 31 and is coplanar with the first body 31. When the telescopic part 33 is in the second state, the second sub-part 332 can be stretched.

[0162] It is understandable that by positioning all the telescopic portions 33 on the side of the first connecting portion 32 facing the first body 31, the telescopic portions 33 can be folded between the first body 31 and the first connecting portion 32. This facilitates the telescopic portions 33 to adapt to the expansion trend of the battery cell 280 when it expands, and allows the telescopic portions 33 to better adapt to the deformation of the first side plate 30 as it expands and contracts with the battery cell 280, thus avoiding the problem of the first side plate 30 breaking due to plastic strain.

[0163] The telescopic section 33 may have a first corner T1 and a second corner T2 arranged sequentially, with the bending direction of the first corner T1 being opposite to that of the second corner T2. The first corner T1 bends towards the receiving cavity W, and the second corner T2 bends away from the receiving cavity W. By providing multiple corners on the telescopic section 33, the telescopic section 33 can have sufficient length to meet the elongation space required for the expansion of the battery cell 280.

[0164] Fourth embodiment:

[0165] Please refer to Figure 23, which is a schematic cross-sectional view of a portion of the structure of the battery casing 100 according to the fourth embodiment of this application.

[0166] In this embodiment, the contents that are the same as in the first embodiment will not be repeated. The difference from the first embodiment is that the structure of the telescopic portion 33 of the first side plate 30 is different. In addition, the description of the battery casing 100 below can be applied to the first, second, and third embodiments above, unless otherwise specified.

[0167] The telescopic part 33 may include a first sub-part 331, a second sub-part 332 and a third sub-part 333.

[0168] One end of the first sub-part 331 can be connected to the first connecting part 32, and the other end of the first sub-part 331 can be bent and connected to one end of the second sub-part 332. The first sub-part 331 is parallel to the first connecting part 32 and is coplanar with the first connecting part 32.

[0169] The other end of the second sub-part 332 is bent and connected to one end of the third sub-part 333. The second sub-part 332 may extend in an S-shape and be located on the side of the first connecting part 32 facing the first body 31, that is, the second sub-part 332 may be located on the side of the second surface 322 of the first connecting part 32.

[0170] The other end of the third sub-part 333 is bent and connected to one end of the fourth sub-part 334. The third sub-part 333 can be arranged parallel to the first sub-part 331 and located on the side of the first connecting part 32 facing the first body 31, that is, the third sub-part 333 can be located on the side of the second surface 322 of the first connecting part 32.

[0171] The other end of the fourth sub-part 334 is bent and connected to the first body 31. The fourth sub-part 334 and the first body 31 are arranged at an angle.

[0172] Part of the second sub-part 332, part of the third sub-part 333, and part of the fourth sub-part 334 protrude from the first body 31 in a direction away from the receiving cavity W. When the telescopic part 33 is in the second state, the first sub-part 331 and the second sub-part 332 can be stretched.

[0173] It is understandable that by positioning all the telescopic portions 33 on the side of the first connecting portion 32 facing the first body 31, the telescopic portions 33 can be folded between the first body 31 and the first connecting portion 32. This facilitates the telescopic portions 33 to adapt to the expansion trend of the battery cell 280 when it expands, and allows the telescopic portions 33 to better adapt to the deformation of the first side plate 30 as it expands and contracts with the battery cell 280, thus avoiding the problem of the first side plate 30 breaking due to plastic strain.

[0174] The telescopic section 33 may have a first corner T1, a second corner T2, a third corner T3, and a fourth corner T4 arranged sequentially. The first corner T1 and the second corner T2 bend in opposite directions. The third corner T3 bends away from the receiving cavity W, and the fourth corner T4 bends towards the receiving cavity W. By providing multiple corners on the telescopic section 33, the telescopic section 33 can have sufficient length to meet the elongation space required for the expansion of the battery cell 280.

[0175] Fifth embodiment:

[0176] Please refer to Figures 24, 25, 26 and 27. Figure 24 is a structural schematic diagram of the fifth embodiment of the battery casing 100 provided in this application. Figure 25 is a partial structural schematic diagram of the side shell 10 of the battery casing 100 shown in Figure 24. Figure 26 is a partial structural schematic diagram of the first side plate 30 of the battery casing 100 shown in Figure 24. Figure 27 is a cross-sectional schematic diagram obtained by cutting along the cutting line EE shown in Figure 24.

[0177] In this embodiment, the contents that are the same as in the first embodiment will not be repeated. The difference from the first embodiment is that the structures of the telescopic portions 33 of the side shell 10 and the first side plate 30 are different. In addition, the description of the battery casing 100 below can be applied to the first, second, third, and fourth embodiments above, unless otherwise specified.

[0178] The top cover 20 may have a first stepped structure 23. The first stepped structure 23 is located at one end of the top cover 20 along its length. The first stepped structure 23 may have a first stepped surface 231. The first stepped surface 231 may be parallel to the XY plane and face the second side plate 12. The first stepped surface 231 may be recessed relative to the surface of the top cover 20 facing the side shell 10 and is used to overlap with a portion of the second side plate 12. There may be two first stepped structures 23, with the two first stepped structures 23 located at opposite ends of the top cover 20 along its length.

[0179] The second side plate 12 may have a second step structure 123. The second step structure 123 is located at the end of the second side plate 12 away from the bottom plate 11. The second step structure 123 may have a second step surface 124, which is parallel to the XY plane and faces the top cover 20. The second step surface 124 may be recessed relative to the surface of the first side plate 30 facing the top cover 20 and is used to overlap with the first step structure 23 of the top cover 20. There may be two second step structures 123, each located at one end of the two first side plates 30 away from the bottom plate 11.

[0180] As shown in Figure 25, when the side shell 10 and the top cover 20 are assembled to form the main shell 50, the first step structure 23 of the top cover 20 overlaps with the second step structure 123 of the first side plate 30 and is welded to the second step structure 123 to fix the top cover 20 to the second side plate 12. At this time, the first step surface 231 of the first step structure 23 and the second step surface 124 of the second step structure 123 are positioned opposite each other.

[0181] Understandably, by having the second step structure 123 of the second side plate 12 overlap the first step structure 23 of the top cover 20, the connection line between the second side plate 12 and the top cover 20 can be exposed. This allows for the use of a seam welding process to weld the top cover 20 and the second side plate 12 together at the connection line between the first step structure 23 and the second step structure 123. Simultaneously, the welding slag generated is blocked by the first step structure 23 and the second step structure 123, preventing it from falling into the battery casing 100 and causing a short circuit in the cell assembly 220 located inside the battery casing 100, thus improving the safety performance of the battery 200. Furthermore, compared to traditional through-welding, seam welding offers higher detectability and welding quality, avoiding incomplete welds. This results in a more reliable connection between the top cover 20 and the second side plate 12, ensuring a stable electrical connection between the cell assembly 220 and the terminals, thereby guaranteeing safety and ensuring the battery 200 can charge and discharge normally.

[0182] As shown in Figures 26 and 27, in this embodiment, other structures in the first body 31 can be referred to the relevant description of the first embodiment. The following will only describe the differences between this embodiment and the first embodiment.

[0183] The telescopic part 33 may include a first sub-part 331, a second sub-part 332, a third sub-part 333, and a fourth sub-part 334.

[0184] One end of the first sub-part 331 can be bent and connected to the first connecting part 32, and the other end of the first sub-part 331 can be bent and connected to one end of the second sub-part 332. The first sub-part 331 can extend from the first connecting part 32 in a direction away from the first body 31 and is located on the side of the first connecting part 32 away from the first body 31, that is, the first sub-part 331 can be located on one side of the first surface 321 of the first connecting part 32.

[0185] The other end of the second sub-part 332 can be bent and connected to one end of the third sub-part 333. The second sub-part 332 can be arranged parallel to the first connecting part 32 and located on the side of the first connecting part 32 away from the first body 31, that is, the second sub-part 332 can be located on the side of the first surface 321 of the first connecting part 32.

[0186] The other end of the third sub-part 333 can be bent and connected to one end of the fourth sub-part 334. The third sub-part 333 can be inclined to the second sub-part 332. Part of the third sub-part 333 can be located on the side of the first connecting part 32 away from the first body 31, and part of the third sub-part 333 can be located on the side of the first connecting part facing the first body 31. That is, part of the third sub-part 333 can be located on one side of the first surface 321 of the first connecting part 32, and part of the third sub-part 333 can be located on one side of the second surface 322 of the first connecting part.

[0187] The other end of the fourth sub-part 334 can be connected to the first body 31. The fourth sub-part 334 can be parallel to the first body 31 and coplanar with the first body 31. When the telescopic part 33 is in the second state, the second sub-part 332 and the third sub-part 333 can be elongated. For example, the telescopic part 33 can extend in a Z-shape.

[0188] It is understandable that by positioning part of the telescopic portion 33 on the side of the first connecting portion 32 facing the first body 31 and part of the telescopic portion 33 on the side of the first connecting portion 32 facing away from the first body 31, the telescopic portion 33 can be folded between the first body 31 and the first connecting portion 32. This facilitates the telescopic portion 33 to adapt to the expansion trend of the battery cell 280 and be easily pulled open when the battery cell 280 expands. It also allows the telescopic portion 33 to better adapt to the deformation of the first side plate 30 as it expands and contracts with the battery cell 280, thus avoiding the problem of the first side plate 30 breaking due to plastic strain.

[0189] The telescopic section 33 may have a first corner T1, a second corner T2, and a third corner T3 arranged sequentially. The first corner T1 bends away from the receiving cavity W. The second corner T2 bends towards the receiving cavity W. The third corner T3 bends away from the receiving cavity W, and the bending direction of the third corner T3 is different from that of the first corner T1. By providing multiple corners on the telescopic section 33, the telescopic section 33 can have sufficient length to meet the elongation space required for the expansion of the battery cell 280.

[0190] Sixth embodiment:

[0191] Please refer to Figures 28, 29, 30, and 31. Figure 28 is a structural schematic diagram of the sixth embodiment of the battery casing 100 provided in this application. Figure 29 is a partial structural schematic diagram of the side shell 10 of the battery casing 100 shown in Figure 28. Figure 30 is a partial structural schematic diagram of the first side plate 30 of the battery casing 100 shown in Figure 28. Figure 31 is a cross-sectional schematic diagram obtained by cutting along the cutting line FF shown in Figure 28.

[0192] In this embodiment, the contents that are the same as in the first embodiment will not be repeated. The difference from the first embodiment is that the structures of the telescopic portions 33 of the side shell 10 and the first side plate 30 are different. In addition, the description of the battery casing 100 below can be applied to the first, second, third, fourth, and fifth embodiments above, unless otherwise specified.

[0193] The top cover 20 is provided with a groove 24, the opening of which is located on the surface of the top cover 20 facing the receiving cavity W. The groove 24 is located at the end of the top cover 20 along its length. There can be two grooves 24, with the two grooves 24 located at opposite ends of the top cover 20 along its length.

[0194] The second side plate 12 may include a second body 121 and a second connecting portion 122. One end of the second body 121 is connected to the base plate 11, and the other end of the second body 121 may extend in the Z direction. One end of the second connecting portion 122 is connected to the end of the second body 121 away from the base plate 11, and the other end of the second connecting portion 122 extends away from the second body 121. The second connecting portion 122 may be bent away from the receiving cavity W. That is, the second connecting portion 122 is bent and connected to the end of the second body 121 away from the base plate 11. The second connecting portion 122 may be used to connect to the top cover 20. Exemplarily, the shape of the second connecting portion 122 may be arc-shaped.

[0195] As shown in Figure 29, when the side shell 10 and the top cover 20 are assembled to form the main shell 50, a portion of the second connecting part 122 of the second side plate 12 is located in the groove 24 of the top cover 20 and is covered by the top cover 20, and is connected to the top cover 20 so that the top cover 20 is fixed to the second side plate 12.

[0196] It is understandable that by covering part of the second connection portion 122 of the second side plate 12 with the top cover 20, the connection boundary between the second side plate 12 and the top cover 20 can be blocked by the top cover 20. This prevents the welding slag generated by the welding of the top cover 20 and the second side plate 12 from falling into the interior of the battery casing 100 and causing a short circuit in the cell assembly 220 located inside the battery casing 100, which is beneficial to improving the safety performance of the battery 200.

[0197] As shown in Figure 30, the extending direction of the first connecting portion 32 of the first side plate 30 intersects the extending direction of the first body 31. When the first side plate 30 is assembled with the main housing 50, the first connecting portion 32 of the first side plate 30 is welded to the main housing 50 to fix the first side plate 30 to the main housing 50.

[0198] Understandably, compared to the traditional through-welding connection method, the seam welding has high detectability and high welding quality, can avoid false welds, and can make the connection between the first side plate 30 and the main shell 50 highly reliable, thereby ensuring a stable electrical connection between the cell assembly 220 and the terminal post, thus ensuring safety, and also ensuring that the battery 200 can charge and discharge normally.

[0199] As shown in Figures 30 and 31, in this embodiment, the telescopic part 33 may include a first sub-part 331, a second sub-part 332, and a third sub-part 333.

[0200] One end of the first sub-part 331 is bent and connected to the first connecting part 32, and the other end of the first sub-part 331 is bent and connected to one end of the second sub-part 332. The extending direction of the first sub-part 331 is parallel to the first body 31. The other end of the second sub-part 332 is bent and connected to one end of the third sub-part 333, and the extending direction of the second sub-part 332 is inclined to the first body 31. The other end of the third sub-part 333 is connected to the first body 31. The extending direction of the third sub-part 333 is parallel to the first body 31 and is coplanar with the first body 31. When the telescopic part 33 is in the second state, the first sub-part 331 and the second sub-part 332 can be stretched.

[0201] It is understandable that by folding the telescopic part 33 between the first body 31 and the first connecting part 32, it is beneficial to make the telescopic part 33 adapt to the expansion trend of the battery cell 280 when the battery cell 280 expands, so that it can be pulled open smoothly, and the telescopic part 33 can better adapt to the deformation of the first side plate 30 as the battery cell 280 expands and contracts, thus avoiding the problem of the first side plate 30 being damaged due to plastic strain.

[0202] The telescopic section 33 may have a first corner T1 and a second corner T2 arranged sequentially. The first corner T1 bends toward the receiving cavity W. The second corner T2 bends away from the receiving cavity W. By providing multiple corners on the telescopic section 33, the telescopic section 33 can have sufficient length to meet the elongation space required for the expansion of the battery cell 280.

[0203] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery, wherein, The battery includes: A battery cell, comprising two first sides and two second sides, wherein the two first sides are spaced apart along the width direction of the battery, and the two second sides are spaced apart along the length direction of the battery, each second side being connected between two first sides, and the area of ​​the first sides being larger than the area of ​​the second sides; and A battery casing having a receiving cavity, the battery cell being located within the receiving cavity, the battery casing including a top cover, side shells, and two first side plates; The top cover is welded to the battery cell; The side shell is welded to the top cover. The side shell includes a bottom plate and two second side plates. The bottom plate and the top cover are spaced apart along the height direction of the battery. The two second side plates are spaced apart along the length direction of the battery. One end of each second side plate is connected to the bottom plate, and the other end of each second side plate is connected to the top cover. Each second side plate is opposite to a second side plate. The bottom plate, one second side plate, the top cover, and the other second side plate are sequentially connected to form the main shell. Two first side plates are spaced apart along the width direction of the battery. The two first side plates are respectively arranged opposite to the two first side surfaces, and the two first side plates abut against each other with the oppositely arranged first side surfaces. At least one first side plate is welded to the main housing, and the weld mark of the first side plate welded to the main housing is a ring weld mark.

2. The battery of claim 1, wherein, The top cover has a first stepped structure located at the end of the top cover along its length. The second side plate includes a second body and a second connecting part. The second body is connected to the bottom plate. The second connecting part is bent and connected to the end of the second body away from the bottom plate. Part of the second connecting part overlaps with the first stepped structure and is welded to the first stepped structure to fix the top cover to the second side plate.

3. The battery of claim 1, wherein, The top cover has a first stepped structure located at the end of the top cover along its length. The second side plate has a second stepped structure located at the end of the second side plate away from the bottom plate. The first stepped structure overlaps the second stepped structure and is welded to the second stepped structure to fix the top cover to the second side plate.

4. The battery of claim 1, wherein, The top cover has a groove, the opening of which is located on the surface of the top cover facing the receiving cavity. The groove is also located at the end of the top cover in the length direction. The second side plate includes a second body and a second connecting portion. The second body is connected to the bottom plate. The second connecting portion is bent and connected to the end of the second body away from the bottom plate. A portion of the second connecting portion is located in the groove and is covered by the top cover, and is welded to the top cover.

5. The battery of any one of claims 1-4, wherein, The first side plate includes a first body, a telescopic part, and a first connecting part connected in sequence; The first body abuts against the first side surface; The first connecting part is located on the periphery of the telescopic part and is welded to the main housing; The telescopic part is bent and connected between the outer edge of the first body and the inner edge of the first connecting part, and the telescopic part can cause the first body to move relative to the first connecting part in a direction perpendicular to the first body.

6. The battery as claimed in claim 5, wherein, The telescopic part has a first state and a second state; When the telescopic part is in the first state, the telescopic part is elongated, and the minimum distance between the first connecting part and the first body in the direction perpendicular to the first body is the first distance; When the telescopic part is in the second state, the telescopic part is retracted, and in the direction perpendicular to the first body, the minimum distance between the first connecting part and the first body is the second distance, which is less than the first distance.

7. The battery as claimed in claim 5, wherein, The telescopic part includes a first sub-part, a second sub-part, a third sub-part, and a fourth sub-part connected in sequence; One end of the first sub-part is bent and connected to the first connecting part, and the other end of the first sub-part is bent and connected to one end of the second sub-part. The first sub-part is located on the side of the first connecting part away from the first body. The other end of the second sub-part is bent and connected to one end of the third sub-part. The second sub-part is parallel to the first connecting part and is located on the side of the first connecting part away from the first body. The other end of the third sub-part is bent and connected to one end of the fourth sub-part. The third sub-part is perpendicular to the second sub-part. Part of the third sub-part is located on the side of the first connecting part away from the first body, and part of the third sub-part is located on the side of the first connecting part facing the first body. The other end of the fourth sub-part is bent and connected to the first body.

8. The battery as claimed in claim 5, wherein, The telescopic part includes a first sub-part, a second sub-part, a third sub-part, and a fourth sub-part connected in sequence; One end of the first sub-part is bent and connected to the first connecting part, and the other end of the first sub-part is bent and connected to one end of the second sub-part. The first sub-part is located on the side of the first connecting part away from the first body. The other end of the second sub-part is bent and connected to one end of the third sub-part. The extension direction of the second sub-part is inclined to the first connecting part. The second sub-part is located on the side of the first connecting part away from the first body. The other end of the third sub-part is bent and connected to one end of the fourth sub-part. At least part of the third sub-part is located on the side of the first connecting part facing the first body. The angle between the third sub-part and the second sub-part is greater than the angle between the second sub-part and the first sub-part. The other end of the fourth sub-part is connected to the first body. The fourth sub-part is parallel to the first body and is coplanar with the first body.

9. The battery as claimed in claim 5, wherein, The telescopic part includes a first sub-part, a second sub-part, and a third sub-part connected in sequence; One end of the first sub-part is connected to the first connecting part, and the other end of the first sub-part is bent and connected to one end of the second sub-part. The first sub-part is parallel to the first connecting part and is coplanar with the first connecting part. The other end of the second sub-part is bent and connected to one end of the third sub-part. The second sub-part extends in an S-shape and is located on the side of the first connecting part facing the first body. The other end of the third sub-part is connected to the first body, and the third sub-part is parallel to the first body and is coplanar with the first body.

10. The battery as claimed in claim 5, wherein, The telescopic part includes a first sub-part, a second sub-part, a third sub-part, and a fourth sub-part connected in sequence; One end of the first sub-part is connected to the first connecting part, and the other end of the first sub-part is bent and connected to one end of the second sub-part. The first sub-part is parallel to the first connecting part and is coplanar with the first connecting part. The other end of the second sub-part is bent and connected to one end of the third sub-part. The second sub-part extends in an S-shape and is located on the side of the first connecting part facing the first body. The other end of the third sub-part is bent and connected to one end of the fourth sub-part. The third sub-part is arranged parallel to the first sub-part and is located on the side of the first connecting part facing the first body. The other end of the fourth sub-part is bent and connected to the first body, and the fourth sub-part is inclined to the first body. A portion of the second sub-part, a portion of the third sub-part, and a portion of the fourth sub-part are provided to protrude relative to the first body in a direction away from the receiving cavity.

11. The battery according to any one of claims 1-4, wherein, The first side plate includes a first body, a telescopic part, and a first connecting part connected in sequence; The first body abuts against the first side surface; The first connecting part is located on the periphery of the telescopic part and is welded to the main housing. The extending direction of the first connecting part intersects with the extending direction of the first body. The telescopic part is bent and connected between the outer edge of the first body and the inner edge of the first connecting part, and the telescopic part can cause the first body to move relative to the first connecting part in a direction perpendicular to the first body.

12. The battery of claim 11, wherein, The battery casing also includes a plurality of protrusions, which are spaced apart on the bottom plate and protrude from the surface of the bottom plate toward the receiving cavity, and are used to contact the battery cell; or, the plurality of protrusions are spaced apart on two second side plates and protrude from the surface of the two second side plates toward the receiving cavity, and are used to contact the battery cell; or, the plurality of protrusions are spaced apart on the bottom plate and two second side plates and protrude from the surface of the bottom plate and two second side plates toward the receiving cavity, and are used to contact the battery cell.

13. The battery of claim 12, wherein, All of the aforementioned protrusions are located within the receiving cavity; One end of the protrusion on the base plate is connected to the surface of the base plate facing the receiving cavity, and the other end of the protrusion on the base plate is used to contact the battery cell; One end of the protrusion on the second side plate is connected to the surface of the second side plate facing the receiving cavity, and the other end of the protrusion on the second side plate is used to contact the battery cell.

14. The battery of claim 12, wherein, The protrusion is provided on the second side plate, and the second side plate includes a connecting edge, which is connected to the first side plate and spaced apart from the protrusion. The maximum contraction depth of the telescopic portion is less than the distance between the protrusion and the connecting edge in the direction perpendicular to the first body.

15. A battery module, wherein, The battery module includes a battery as described in any one of claims 1-14, wherein the battery casing is configured to contact the battery cell after being subjected to force.

16. An electrical appliance, wherein, The electrical equipment includes the battery module as described in claim 15.

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