Battery, battery module and electric equipment

Abstract

The invention provides a battery, a battery module and electric equipment. The battery comprises a battery cell and a battery shell, the battery cell is located in a containing cavity of the battery shell and comprises a first side face and a second side face which are connected, and the area of the first side face is larger than that of the second side face; the battery shell comprises a top cover, a side shell and two first side plates; the top cover is welded with the battery cell; the side shell is welded with the top cover and comprises a bottom plate and two second side plates, the bottom plate and the top cover are spaced along the height direction of the battery, the two second side plates are spaced along the length direction of the battery, one end of each second side plate is connected with the bottom plate, the other end of each second side plate is connected with the top cover and is opposite to one second side surface; the bottom plate, one second side plate, the top cover and the other second side plate are sequentially connected to form a main shell; the two first side plates are arranged at intervals in the width direction of the battery, the two first side plates abut against the oppositely-arranged first side faces respectively, at least one first side plate is welded to the main shell, and the welding mark of the first side plate welded to the main shell is an annular welding mark.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a battery, a battery module and an electrical device. Background Art

[0002] With the continuous development of renewable energy such as wind energy and solar energy, the market demand for batteries with electrochemical energy storage and release is also increasing. The battery includes a battery casing and a battery cell, and the battery cell is installed inside the battery casing. However, a large gap is usually set between the battery cell and the battery casing to avoid interference when the battery cell enters the casing. However, such a structure makes it difficult to load the external preload on the battery cell, affecting the performance of the battery. Summary of the invention

[0003] The embodiments of the present application provide a battery, a battery module and an electrical device, which can load a preload force on a battery cell so that the battery cell can output electrical energy safely and effectively.

[0004] In a first aspect, the present application provides a battery, comprising:

[0005] A battery cell, the battery cell comprising two first side surfaces and two second side surfaces, the two first side surfaces are spaced apart along a width direction of the battery, the two second side surfaces are spaced apart along a length direction of the battery, each second side surface is connected between the two first side surfaces, and an area of ​​the first side surface is greater than an area of ​​the second side surface; and

[0006] A battery housing, wherein the battery housing has a receiving cavity, the battery cell is located in the receiving cavity, and the battery housing comprises a top cover, a side shell and two first side plates;

[0007] The top cover is connected to the battery core by welding;

[0008] The side shell is welded to the top cover, the side shell comprises a bottom plate and two second side plates, the bottom plate and the top cover are spaced apart in the height direction of the battery, the two second side plates are spaced apart in the length direction of the battery, one end of each second side plate is connected to the bottom plate, the other end of each second side plate is connected to the top cover, each second side plate is arranged opposite to one second side surface, the bottom plate, one second side plate, the top cover and another second side plate are sequentially connected to form a main shell;

[0009] The two first side plates are arranged at intervals along the width direction of the battery, the two first side plates are arranged opposite to the two first side surfaces respectively, and the two first side plates are respectively abutted against the oppositely arranged first side surfaces, at least one of the first side plates is welded to the main shell, and the weld mark of the first side plate welded to the main shell is an annular weld mark.

[0010] It is understandable that, since the battery housing is composed of a top cover, a side housing and two first side plates, and the top cover, the side housing and the two first side plates are all independent structural members, the battery housing is a split structure.

[0011] On the one hand, the battery casing of the split structure can be divided into multiple parts, which can be assembled together layer by layer, avoiding the problem of excessive extension length, reduced strength, and reduced maintenance convenience caused by the battery casing being made of the same structural parts, which is conducive to positioning and assembly.

[0012] On the other hand, the split-structure battery casing allows, when assembling the battery, the battery cell and the top cover can be welded and fixed first, and then the top cover and the side shell are welded so that the battery cell is located in the area enclosed by the top cover and the side shell, and finally the two first side plates are welded to the opposite sides of the side shell and the top cover so that the battery cell is located inside the battery casing, thereby realizing the assembly process of first loading the battery cell and then welding to form the battery casing.

[0013] This assembly method enables the two first side plates to respectively abut against the two first side faces of the battery cell, so that zero-gap assembly can be achieved between the two first side faces of the battery cell and the battery casing. Therefore, when the battery is subjected to external force, the battery casing can transfer the force acting thereon to the battery cell, so that the battery cell can be loaded with preload force and output electrical energy safely and effectively.

[0014] In one possible embodiment, the top cover has a first step structure, the first step structure is located at the end of the top cover in the length direction, the second side panel 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 an end of the second body away from the bottom plate, a portion of the second connecting portion overlaps the first step structure and is welded to the first step structure to fix the top cover to the second side panel.

[0015] In a possible embodiment, the top cover has a first step structure, the first step structure is located at the end of the top cover in the length direction, the second side panel has a second step structure, the second step structure is located at the end of the second side panel away from the bottom panel, the first step structure is overlapped on the second step structure, and is welded to the second step structure to fix the top cover to the second side panel.

[0016] In a possible implementation manner, the battery further includes a welding portion, the first side plate is sealed and connected to the main shell body via the welding portion, and the welding portion is disposed around an outer edge of the main shell body.

[0017] In one possible embodiment, the top cover has a groove, the opening of the groove is located on the surface of the top cover facing the accommodating cavity, and the groove is also located at the end of the top cover in the length direction, the second side panel 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 an 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.

[0018] In a possible implementation manner, the first side panel includes a first body, a telescopic portion, and a first connecting portion that are sequentially connected;

[0019] The first body abuts against the first side surface;

[0020] The first connecting portion is located at the periphery of the telescopic portion and is welded to the main shell;

[0021] The telescopic portion is bent and connected between the outer edge of the first body and the inner edge of the first connecting portion, and the telescopic portion can cause the first body to move relative to the first connecting portion along a direction perpendicular to the first body.

[0022] In a possible implementation manner, the telescopic portion has a first state and a second state;

[0023] When the telescopic portion is in the first state, the telescopic portion is elongated, and in a direction perpendicular to the first body, a minimum distance between the first connecting portion and the first body is a first distance;

[0024] When the telescopic portion is in the second state, the telescopic portion is retracted, and in a direction perpendicular to the first body, a minimum distance between the first connecting portion and the first body is a second distance, and the second distance is smaller than the first distance.

[0025] In a possible implementation manner, the telescopic portion includes a first sub-portion, a second sub-portion, a third sub-portion and a fourth sub-portion which are connected in sequence;

[0026] One end of the first sub-part is bent and connected to the first connecting part, the other end of the first sub-part is bent and connected to one end of the second sub-part, and the first sub-part is located on a side of the first connecting part away from the first body;

[0027] The other end of the second sub-part is bent and connected to one end of the third sub-part, and the second sub-part is parallel to the first connecting part and is located on a side of the first connecting part away from the first body;

[0028] The other end of the third sub-section is bent and connected to one end of the fourth sub-section, the third sub-section is perpendicular to the second sub-section, part of the third sub-section is located on the side of the first connecting portion away from the first body, and part of the third sub-section is located on the side of the first connecting portion facing the first body;

[0029] The other end of the fourth sub-part is bent and connected to the first body.

[0030] In a possible implementation manner, the telescopic portion includes a first sub-portion, a second sub-portion, a third sub-portion and a fourth sub-portion which are connected in sequence;

[0031] One end of the first sub-part is bent and connected to the first connecting part, the other end of the first sub-part is bent and connected to one end of the second sub-part, and the first sub-part is located on a side of the first connecting part away from the first body;

[0032] The other end of the second sub-section is bent and connected to one end of the third sub-section, the extension direction of the second sub-section is inclined with the first connecting section, and the second sub-section is located on a side of the first connecting section away from the first body;

[0033] The other end of the third sub-section is bent and connected to one end of the fourth sub-section, at least part of the third sub-section is located on the side of the first connecting portion facing the first body, and the angle between the third sub-section and the second sub-section is greater than the angle between the second sub-section and the first sub-section;

[0034] The other end of the fourth sub-section is connected to the first body. The fourth sub-section is parallel to the first body and is arranged coplanar with the first body.

[0035] In a possible implementation manner, the telescopic portion includes a first sub-portion, a second sub-portion, and a third sub-portion that are sequentially connected;

[0036] One end of the first sub-portion is connected to the first connecting portion, the other end of the first sub-portion is bent and connected to one end of the second sub-portion, and the first sub-portion is parallel to the first connecting portion and is arranged coplanar with the first connecting portion;

[0037] The other end of the second sub-section is bent and connected to one end of the third sub-section, and the second sub-section extends in an S shape and is located on a side of the first connecting portion facing the first body;

[0038] The other end of the third sub-section is connected to the first body. The third sub-section is parallel to the first body and is arranged coplanar with the first body.

[0039] In a possible implementation manner, the telescopic portion includes a first sub-portion, a second sub-portion, a third sub-portion and a fourth sub-portion which are connected in sequence;

[0040] One end of the first sub-portion is connected to the first connecting portion, the other end of the first sub-portion is bent and connected to one end of the second sub-portion, and the first sub-portion is parallel to the first connecting portion and is arranged coplanar with the first connecting portion;

[0041] The other end of the second sub-section is bent and connected to one end of the third sub-section, and the second sub-section extends in an S shape and is located on a side of the first connecting portion facing the first body;

[0042] The other end of the third sub-section is bent and connected to one end of the fourth sub-section, and the third sub-section is arranged in parallel with the first sub-section and is located on a side of the first connecting portion facing the first body;

[0043] The other end of the fourth sub-part is bent and connected to the first body, and the fourth sub-part is arranged obliquely with respect to the first body;

[0044] Part of the second sub-portion, part of the third sub-portion and part of the fourth sub-portion are protruded relative to the first body in a direction away from the accommodating cavity.

[0045] In a possible implementation manner, the first side panel includes a first body, a telescopic portion, and a first connecting portion that are sequentially connected;

[0046] The first body abuts against the first side surface;

[0047] The first connection portion is located at the periphery of the telescopic portion and is welded to the main shell body, and the extension direction of the first connection portion intersects with the extension direction of the first body;

[0048] The telescopic portion is bent and connected between the outer edge of the first body and the inner edge of the first connecting portion, and the telescopic portion can cause the first body to move relative to the first connecting portion along a direction perpendicular to the first body.

[0049] In a possible embodiment, the battery case further includes a plurality of protrusions, wherein the plurality of protrusions are spaced apart on the bottom plate, protrude relative to the bottom plate toward the surface of the accommodating cavity, and are used to contact the battery cell; or, the plurality of protrusions are spaced apart on the two second side plates, protrude relative to the two second side plates toward the surface of the accommodating cavity, and are used to contact the battery cell; or, the plurality of protrusions are spaced apart on the bottom plate and the two second side plates, protrude relative to the bottom plate and the two second side plates toward the surface of the accommodating cavity, and are used to contact the battery cell.

[0050] In a possible implementation manner, the convex portion is provided on the second side plate, and the second side plate includes a connecting edge, the connecting edge is connected to the first side plate, and is spaced apart from the convex portion;

[0051] The maximum contraction depth of the telescopic portion is less than the distance between the convex portion and the connecting edge in a direction perpendicular to the first body.

[0052] It can be understood that when the telescopic part is recessed relative to the side shell, since the maximum contraction depth of the telescopic part is smaller than the distance between the protrusion and the connecting edge of the second side plate in a direction perpendicular to the first main body, the telescopic action of the telescopic part will not interfere with the protrusion, thereby avoiding the problem that the protrusion and the telescopic part interfere with each other and affect welding due to the telescopic part moving to the side and contacting the protrusion, and the telescopic part abuts against the battery cell and affects the battery cell, and the reliability is better.

[0053] In a possible implementation manner, the plurality of protrusions are all located in the accommodating cavity;

[0054] One end of the convex portion provided on the bottom plate is connected to the surface of the bottom plate facing the accommodating cavity, and the other end of the convex portion provided on the bottom plate is used to contact the battery core;

[0055] One end of the convex portion provided on the second side plate is connected to the surface of the second side plate facing the accommodating cavity, and the other end of the convex portion provided on the second side plate is used to contact the battery core.

[0056] In a possible implementation manner, the convex portion provided on the second side plate is further recessed relative to a surface of the second side plate facing away from the accommodating cavity;

[0057] The convex portion arranged on the bottom plate is also arranged to be recessed relative to the surface of the bottom plate facing away from the accommodating cavity.

[0058] In a possible implementation manner, the bottom plate and the two second side plates are connected to form an integrated structure.

[0059] In a second aspect, the present application further provides a battery module, the battery module comprising the battery as described above, wherein the battery casing of the battery is used to contact the battery cell of the battery after being subjected to force.

[0060] In a third aspect, the present application further provides an electrical device, wherein the electrical device comprises the battery module as described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 is a schematic diagram of the structure of an energy storage system provided in an embodiment of the present application;

[0062] Figure 2is a structural schematic diagram of a battery provided in an embodiment of the present application;

[0063] Figure 3 yes Figure 2 An exploded schematic diagram of a partial structure of a battery shown;

[0064] Figure 4 is a structural schematic diagram of a first embodiment of a battery housing provided by the present application;

[0065] Figure 5 yes Figure 4 An exploded schematic diagram of a battery housing is shown;

[0066] Figure 6 yes Figure 2 A schematic diagram of an assembled state of the battery shown;

[0067] Figure 7 yes Figure 4 A schematic structural diagram of a side shell of a battery shell shown;

[0068] Figure 8 is along Figure 7 The schematic diagram of the partial cross section obtained by cutting along the cutting line AA shown;

[0069] Fig. 9 yes Figure 4 Another schematic diagram of the structure of the side shell of the battery shell shown;

[0070] Fig.10 is along Fig. 9 A schematic diagram of a partial cross section obtained by cutting along the cutting line BB shown;

[0071] Fig.11 yes Figure 4 A schematic structural diagram of an angle of the top cover of the battery housing shown;

[0072] Fig.12 yes Figure 4 A schematic structural diagram of a side shell of a battery housing at an angle shown;

[0073] Fig.13 yes Figure 4 A schematic diagram of a portion of the structure of a main housing formed by assembling a side shell and a top cover of a battery housing;

[0074] Fig.14 yes Figure 4 A structural schematic diagram of a welding portion of a battery housing shown;

[0075] Fig.15 yes Figure 4 A schematic structural diagram of an angle of a first side plate of a battery housing shown;

[0076] Fig.16a is a schematic diagram of a state of a battery provided in the first embodiment of the present application;

[0077] Fig.16b is a schematic diagram of another state of the battery provided in the first embodiment of the present application;

[0078] Fig.16c is another schematic diagram of another state of the battery provided in the first embodiment of the present application;

[0079] Fig.17 is along Figure 4 The section line CC shown is a schematic cross-sectional view of the partial structure shown;

[0080] Fig.18 is a structural schematic diagram of a second embodiment of a battery housing provided by the present application;

[0081] Fig.19 yes Fig.18 A schematic structural diagram of a first side plate of a battery housing shown;

[0082] Fig. 20 is along Fig.18 The schematic cross-sectional view obtained by cutting along the cutting line DD shown;

[0083] Fig.21 is a schematic diagram of a state of a battery provided in the second embodiment of the present application;

[0084] Fig. 22 is a schematic cross-sectional diagram of a partial structure of a third embodiment of a battery housing provided by the present application;

[0085] Fig.23 is a schematic cross-sectional diagram of a partial structure of a fourth embodiment of a battery housing provided by the present application;

[0086] Fig.24 is a structural schematic diagram of a fifth embodiment of a battery housing provided by the present application;

[0087] Fig.25 yes Fig.24 A schematic diagram of a partial structure of a side shell of a battery housing shown;

[0088] Fig.26 yes Fig.24 A partial structural schematic diagram of a first side plate of a battery housing shown;

[0089] Fig. 27 is along Fig.24 The schematic cross-sectional view obtained by cutting along the cutting line EE shown;

[0090] Fig.28is a structural schematic diagram of a sixth embodiment of a battery housing provided by the present application;

[0091] Fig.29 yes Fig.28 A schematic diagram of a partial structure of a side shell of a battery housing shown;

[0092] Fig.30 yes Fig.28 A partial structural schematic diagram of a first side plate of a battery housing shown;

[0093] Fig.31 is along Fig.28 The schematic cross-sectional view is shown along the cutting line FF.

[0094] Reference numerals:

[0095] Energy storage system 400, electric energy conversion device 410, first user load 420, second user load 430, electric equipment 300, battery 200, the length direction of battery 200 is X direction, the width direction of battery 200 is Y direction, the height direction of battery 200 is Z direction, battery housing 100, battery core assembly 220, insulating film 230, pole assembly 240, explosion-proof valve assembly 250, top patch 260, outer film 270, battery core 280, side shell 10, top cover 20, first side plate 30, convex part 40, main shell 50, accommodating cavity W, bottom plate 11, second side plate 12, 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 DESCRIPTION

[0096] For ease of understanding, the terms involved in the embodiments of the present application are first explained.

[0097] And / or: It is just a way to describe the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0098] Multiple: refers to two or more than two.

[0099] Connection: should be understood in a broad sense. For example, A and B are connected, which can be either direct or indirect through an intermediary.

[0100] The specific implementation of the present application will be clearly described below in conjunction with the accompanying drawings.

[0101] Since the energy people need is highly temporal and spatial, in order to rationally utilize energy and improve energy utilization, it is necessary to use a medium or device to store one form of energy in the same form or convert it into another form of energy, and then release it in a specific form of energy based on future application needs. As we all know, the current generation of green electricity generally relies on photovoltaics, wind power, water potential, etc., while wind and solar energy generally have problems of strong intermittency and volatility, which will cause instability of the power grid, insufficient electricity during peak hours, too much electricity during low hours, and unstable voltage will also cause damage to electricity. Therefore, it may cause "wind and light abandonment" problems due to insufficient electricity demand or insufficient grid acceptance capacity. To solve these problems, energy storage must be relied on. That is, electrical energy is converted into other forms of energy by physical or chemical means and stored, and energy is converted into electrical energy and released when needed. In simple terms, energy storage is similar to a large "power bank". When photovoltaic and wind energy are sufficient, electrical energy is stored and the stored electricity is released when needed.

[0102] Taking electrochemical energy storage as an example, an embodiment of the present application provides an electrical device 300, which has a group of chemical batteries inside. The chemical elements in the chemical batteries are mainly used as energy storage media. The charging and discharging process is accompanied by chemical reactions or changes in the energy storage media. Simply put, the electricity generated by wind and solar energy is stored in chemical batteries. When the use of external electricity reaches a peak, the stored electricity is released for use, or transferred to places where electricity is scarce for use.

[0103] At present, energy storage application scenarios are quite extensive, including power 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 300 include:

[0104] Large-scale 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, achieve load matching of electricity in time and space, enhance the ability to absorb renewable energy, and are of great significance in grid system backup, alleviating peak load power supply pressure, and peak and frequency regulation.

[0105] The main operating mode of 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 home energy storage scenarios on the user side is "peak shaving and valley filling". Since there are large price differences in electricity charges at peak and valley locations according to electricity demand, after users have electrical equipment 300, in order to reduce costs, they usually charge the energy storage cabinet / box during the low electricity price period; during the peak electricity price period, the electricity in the electrical equipment 300 is discharged for use, so as to save electricity bills. In addition, in remote areas, as well as areas prone to natural disasters such as earthquakes and hurricanes, the presence of household electrical equipment 300 is equivalent to users providing themselves and the power grid with backup power, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0106] See also Figure 1 , Figure 1 4 is a schematic diagram of the structure of the energy storage system 400 provided in the embodiment of the present application. The embodiment of the present application takes the household energy storage scenario in the user-side energy storage as an example for explanation, and the electric device 300 of the present application is not limited to the household energy storage scenario.

[0107] The embodiment of the present application provides an energy storage system 400, which includes an electric energy conversion device 410, a first user load 420, a second user load 430, and an electric device 300. The electric device 300 is a small energy storage box that can be mounted on an outdoor wall by wall-mounting. Specifically, the photovoltaic panel can convert solar energy into electric energy during the period of low electricity prices, and the electric device 300 is used to store the electric energy and supply it to street lamps and household appliances for use during the peak electricity prices, or to supply power when the power grid is out of power / power outage.

[0108] Among them, the electric device 300 may include but is not limited to single cells, battery modules, battery packs, battery systems, etc. When the electric device 300 includes multiple batteries, the multiple batteries are electrically connected and are all located inside the shell of the electric device 300, which can be protected from interference from the external environment under the protection of the shell. Exemplarily, multiple batteries are arranged at intervals. Multiple batteries can be connected in series, or in parallel, or a mixture of series and parallel connections to achieve greater capacity and power. The embodiments of the present application are described by taking the electric device 300 including a battery module as an example, but it should be understood that the electric device 300 is not limited to this.

[0109] The battery module may include a battery 200 and an external force device. The external force device may be located at the periphery of the battery 200 and may apply a force to the battery 200. When the battery housing 100 of the battery 200 is subjected to a force from the external force device, it will abut against the battery cell 280 of the battery 200 to transfer the force from the external force device to the battery cell 280 of the battery 200 and provide a continuous pre-tightening force for the battery cell 280 of the battery 200. There may be multiple batteries 200, and multiple batteries 200 may be arranged in an array.

[0110] Of course, in some other embodiments, the battery module may not include an external force device, and there is no strict limitation to this.

[0111] Please refer to Figure 2 and Figure 3 , Figure 2 is a schematic structural diagram of a battery 200 provided in an embodiment of the present application, Figure 3 yes Figure 2 FIG. 2 is a schematic exploded view of a partial structure of a battery 200 shown.

[0112] For the convenience of description, the length direction of the battery 200 is defined as the X direction, the width direction of the battery 200 is defined as the Y direction, and the height direction of the battery 200 is defined as the Z direction. The X direction, the Y direction, and the Z direction are perpendicular to each other.

[0113] The battery 200 may include a battery housing 100, a battery cell assembly 220, an insulating film 230, a pole assembly 240, an explosion-proof valve assembly 250, a top patch 260 and an outer film 270. The battery cell assembly 220 is installed inside the battery housing 100. The insulating film 230 is installed inside the battery housing 100 and is located between the battery cell assembly 220 and the battery housing 100, and is used for insulation between the battery cell assembly 220 and the battery housing 100. The pole assembly 240 is installed on the top cover 20 of the battery housing 100 and is electrically connected to the battery cell assembly 220 to achieve the lead-out of the electrode. The explosion-proof valve assembly 250 is installed on the top cover 20 of the battery housing 100 and is spaced from the pole assembly 240 for pressure relief protection of the battery 200. The top patch 260 is attached to the top cover 20 of the battery housing 100, which can prevent the top cover 20 of the battery housing 100 from being impacted by external forces and short-circuited with other circuits, and plays a role in insulation and protection. The outer film 270 is coated on the outside of the battery housing 100 and part of the outer edge of the top patch 260 to cooperate with the top patch 260 to surround the battery housing 100 to play the role of insulation and protection.

[0114] Among them, the number of pole assemblies 240 can be two, and the two pole assemblies 240 are arranged at intervals on the top cover 20 of the battery housing 100, and are respectively a positive pole assembly and a negative pole assembly. The explosion-proof valve assembly 250 can be arranged between the two pole assemblies 240. The battery cell assembly 220 may include a plurality of battery cells 280, and the plurality of battery cells 280 may be arranged in series, or in parallel, or in a mixed connection of series and parallel. The arrangement of a plurality of battery cells 280 can increase the battery capacity of the energy storage device, so that the battery can be used for a long time, thereby increasing the applicable scenarios of the battery. Exemplarily, the number of battery cells 280 can be two, and the two battery cells 280 are arranged in sequence along the Y direction. The battery housing 100 may be a metal shell, such as an aluminum shell. Of course, the battery housing 100 may also be made of other materials.

[0115] The battery cell 280 may include two first side surfaces 2810 and two second side surfaces 2820. The two first side surfaces 2810 may be spaced apart along the width direction (the Y direction in the figure) of the battery 200. The two second side surfaces 2820 may be spaced apart along the length direction (the X direction in the figure) of the battery 200. Each second side surface 2820 is connected between the two first side surfaces 2810. The area of ​​the first side surface 2810 is greater than the area of ​​the second side surface 2820. That is, the first side surface 2810 is the largest surface in the battery cell 280.

[0116] It should be noted that Figure 2 and Figure 3 The purpose is only to schematically describe the connection relationship between the battery housing 100, the battery cell assembly 220, the insulating film 230, the pole assembly 240, the explosion-proof valve assembly 250, the top patch 260 and the outer film 270, and it does not specifically limit the connection position, specific structure and quantity of each device. The structure illustrated in the embodiment of the present application does not constitute a specific limitation on the battery 200. In other embodiments of the present application, the battery 200 may include Figure 2 and Figure 3 More or fewer components may be shown, or some components may be combined or separated, or the components may be arranged differently. Figure 2 and Figure 3 The components shown may be implemented in hardware, software or a combination of software and hardware.

[0117] It is understandable that during the working process of the battery cell, the battery cell will undergo a power cycle of charging and discharging, and will generate expansion force and expand. In order to avoid adverse effects on the battery due to the expansion of the battery cell, a battery shell is usually used to apply a certain pre-tightening force to the battery cell to resist and alleviate the expansion force generated by the battery cell. In the related art, in order to prevent the battery shell packaged outside the battery cell from being cracked by the expansion of the battery cell, when the battery cell is installed in the battery shell, it is necessary to reduce the pre-tightening force that can be applied by the battery shell to ensure the safety of the battery shell. However, the reduction of the pre-tightening force of the battery shell will also cause the gap between the battery cell and the battery shell to increase, which may easily cause the battery cell and the inner wall of the battery shell to collide and vibrate, affecting the safe output of the battery cell's electric energy. In addition, for batteries with relatively high pre-tightening force requirements, in order to shorten the transmission distance of active ions and reduce the internal resistance of the battery, it is necessary to increase the pre-tightening force to make the pole piece assembly in the battery contact tightly.

[0118] Based on this, the embodiment of the present application provides a battery housing 100, which can release the expansion force generated by the battery cell 280 when the battery cell 280 expands, resist the expansion force generated by the battery cell 280, provide pre-tightening force to the battery cell 280, and improve the situation that the battery cell 280 and the battery housing are easily offset, misaligned, and separated. In addition, the pre-tightening force can be increased to make the battery cell assembly 220 in the battery 200 and the pole assembly 240 in close contact, thereby improving the charge and discharge performance of the battery 200.

[0119] The specific structure of the battery housing 100 provided in the embodiments of the present application will be described below through six embodiments.

[0120] First embodiment:

[0121] Please refer to Figure 4 and Figure 5 , Figure 4 is a schematic structural diagram of a first embodiment of a battery housing 100 provided in the present application, Figure 5 yes Figure 4 An exploded schematic diagram of a battery housing 100 is shown.

[0122] The battery housing 100 may include a side housing 10, a top cover 20 and two first side plates 30. The top cover 20 is welded to the battery cell 280. The side housing 10 and the top cover 20 are welded to form the main housing 50 of the battery housing 100. The main housing 50 is hollow and annular and has two openings. One opening of the main housing 50 is located at one end of the width direction of the main housing 50, and the other opening of the main housing 50 is located at the other end of the width direction of the main housing 50. The two first side plates 30 are respectively located on both sides of the width direction (ie, the Y direction) of the main housing 50, and are arranged oppositely and at intervals. One first side plate 30 closes one opening of the main housing 50, and the other first side plate 30 closes the other opening of the main housing 50. Among them, the first side plate 30 is the largest plate in the battery housing 100, and can also be called the large surface of the battery housing 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 arranged opposite to the two first side surfaces 2810 of the battery cell 280, and the two first side plates 30 are respectively abutted against the first side surfaces 2810 of the battery cell 280 arranged opposite to each other. The side shell 10, the top cover 20 and the two first side plates 30 enclose a receiving cavity W of the battery housing 100, and the receiving cavity W can be used to receive other structural components in the battery 200 such as the battery cell 280 and the insulating film 230.

[0123] Specifically, the side shell 10 may include a bottom plate 11 and two second side plates 12. The bottom 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 bottom 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 bottom 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 bottom plate 11, a second side plate 12, the top cover 20, and another 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 welding mark of the first side plate 30 welded to the main shell 50 is a circular welding mark. On the bottom plate 11 and the top cover 20, the second side plate 12 and the first side plate 30 may be arranged crosswise. Exemplarily, the weld mark of the first side plate 30 welded to the main housing 50 may be prepared by a one-time forming process. That is, the weld mark of the first side plate 30 welded to the main housing 50 is a one-time formed annular weld mark.

[0124] Wherein, before the battery 200 is assembled and formed, the two first side panels 30 are respectively in contact with the first side surfaces 2810 of the battery cells 280 arranged opposite to each other. And / or, when the battery 200 is in a fully charged state, the two first side panels 30 are respectively in contact with the first side surfaces 2810 of the battery cells 280 arranged opposite to each other. The side shell 10 may be an integral structure. That is, the bottom plate 11 and the two second side panels 12 are connected to form an integral structure. Exemplarily, the shape of the side shell 10 may be U-shaped. The bottom plate 11 and the two second side panels 12 may be an integral structure formed by assembly methods such as welding and bonding. Alternatively, the bottom plate 11 and the two second side panels 12 may also be an integral structure formed by a method such as integral molding. In some other embodiments, one of the two first side panels 30 may be connected to the side shell 10 by a method such as integral molding to form an integral structure.

[0125] It is understandable that, since the battery housing 100 is composed of the top cover 20, the side housing 10 and the two first side plates 30, and the top cover 20, the side housing 10 and the two first side plates 30 are all independent structural members, the battery housing 100 is a split structure.

[0126] On the one hand, the split-structure battery casing 100 can be split into multiple parts, which can be assembled together layer by layer to avoid the problem of excessive extension length, reduced strength, and reduced maintenance convenience caused by the battery casing 100 being made of the same structural parts, which is conducive to positioning and assembly.

[0127] On the other hand, when assembling the battery 200, the battery casing 100 with a split structure can first weld and fix the battery cell 280 to the top cover 20, and then weld the top cover 20 to the side shell 10, so that the battery cell 280 is located in the area enclosed by the top cover 20 and the side shell 10, and finally weld the two first side plates 30 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, thereby realizing the assembly process of first loading the battery cell 280 and then welding to form the battery casing 100.

[0128] This assembly method enables the two first side plates 30 to respectively abut against the two first side surfaces 2810 of the battery cell 280, so that zero-gap assembly can be achieved between the two first side surfaces 2810 of the battery cell 280 and the battery casing 100. Therefore, when the battery 200 is subjected to a force from outside the battery 200, the battery casing 100 can transfer the force acting thereon to the battery cell 280, so that the battery cell 280 can be loaded with a preload and output electrical energy safely and effectively.

[0129] In one possible application scenario, see Figure 6 , Figure 6 yes Figure 2A schematic diagram of an assembled state of a battery is shown.

[0130] The assembly process of the battery 200 may include at least the following steps:

[0131] The first step is to weld the battery cell assembly 220 to the top cover 20 on which the pole assembly 240 is installed. The top cover 20 is welded to the battery cell 280 .

[0132] Step 2: Wrap the outer periphery of the battery cell assembly 220 with the insulating film 230 so that the insulating film 230 surrounds the battery cell assembly 220 .

[0133] Step 3: Weld the side shell 10 and 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 .

[0134] 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 shell 100 .

[0135] Step 5: attach an outer film 270 to the periphery of the battery housing 100 so that the outer film 270 covers the side shell 10 , the two first side plates 30 and a portion of the top cover 20 .

[0136] Step 6: attach the top patch 260 on the top cover 20 so that the top patch 260 covers the top cover 20 and a part of the outer film 270 .

[0137] In this embodiment, the battery housing 100 may further include a plurality of protrusions 40. The plurality of protrusions 40 are arranged at intervals 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 a pre-tightening force for the battery cell 280. Among them, the inner surface of the side shell 10 is the surface of the side shell 10 facing the accommodating cavity W. The plurality of protrusions 40 may be arranged at intervals on the bottom 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 arranged at intervals on the bottom plate 11, and protrude relative to the surface of the bottom plate 11 facing the accommodating cavity W, and are used to contact the battery cell 280. Alternatively, the plurality of protrusions 40 may be arranged at intervals on the two second side plates 12, and protrude relative to the surface of the two second side plates 12 facing the accommodating cavity W, and are used to contact the battery cell 280. Alternatively, a plurality of protrusions 40 may be spaced apart on the bottom plate 11 and the two second side plates 12 , and protrude relative to the bottom plate 11 and the two second side plates 12 toward the surface of the accommodation cavity W, and are used to contact the battery cells 280 .

[0138] On the first aspect, by providing a plurality of protrusions 40 and enabling the plurality of protrusions 40 to protrude relative to the surface of the bottom plate 11 and / or the two second side plates 12 toward the accommodating cavity W, the plurality of protrusions 40 can cooperate to limit the movement of the battery cell 280 in the battery casing 100, thereby playing a good limiting role and effectively preventing the battery cell 280 from being offset in the battery casing 100, resulting in the pre-tightening force in the bottom plate 11 and / or the two second side plates 12 being unable to be fully transmitted to the battery cell 280, thereby causing the capacity of the battery cell 280 to be reduced.

[0139] On the second aspect, by providing a plurality of protrusions 40 and distributing the plurality of protrusions 40 on the bottom plate 11 and / or the two second side plates 12 and used to contact the battery cell 280, a smaller gap or no gap can be provided between the side surfaces of the battery cell 280 that are arranged opposite to the bottom plate 11 and / or the two second side plates 12 and the battery casing 100, so that zero gap can be achieved on the side surfaces of the battery, thereby improving the stability and reliability of the battery.

[0140] On the third aspect, by providing a plurality of protrusions 40 and distributing the plurality of protrusions 40 on the bottom plate 11 and / or the two second side plates 12 and being used to contact the battery cell 280, the plurality of protrusions 40 can cooperate to position and hold the battery cell 280 and apply a pre-tightening force to the battery cell 280, so that when the battery cell 280 expands due to multiple charge and discharge cycles, the plurality of protrusions 40 can transfer the pre-tightening force on the side shell 10 to the battery cell 280, so as to provide a certain pre-tightening force for the battery cell 280 to resist the expansion force generated by the battery cell 280, and at the same time, it also avoids the expansion space of the battery cell 280 in the thickness direction for the battery cell 280, so that the loading of the pre-tightening force on the battery cell 280 and the expansion of the battery cell 280 will not affect each other, the battery cell 280 can output electrical energy safely and effectively, and effectively avoid the problem that the battery cell 280 is affected by excessive restraint force and the internal structure and state of the battery cell 280 are affected, thereby slowing down the aging of the battery and improving the performance and life of the battery.

[0141] The following description will be given by taking an example where a plurality of protrusions 40 are arranged at intervals on the bottom plate 11 and the two second side plates 12 , but it should be understood that the invention is not limited thereto.

[0142] In a possible implementation, please refer to Figure 7 and Figure 8 , Figure 7 yes Figure 4 A schematic structural diagram of the side shell 10 of the battery housing 100 is shown. Figure 8 is along Figure 7 The partial cross-sectional schematic diagram shown is obtained by cutting along the cutting line AA.

[0143] Multiple protrusions 40 may all be located in the accommodating cavity W. One end of the protrusion 40 provided on the bottom plate 11 is connected to the surface of the bottom plate 11 facing the accommodating cavity W, and the other end of the protrusion 40 provided on the bottom plate 11 is used to contact the battery cell 280. One end of the protrusion 40 provided on the second side plate 12 is connected to the surface of the second side plate 12 facing the accommodating cavity W, and the other end of the protrusion 40 provided on the second side plate 12 is used to contact the battery cell 280. Among them, multiple protrusions 40 can be connected to the bottom plate 11 and the second side plate 12 by assembly methods such as bonding and welding to form an integrated structure. Exemplarily, the material of the protrusion 40 may be plastic. The plastic protrusion may be bonded to the bottom plate 11 or the second side plate 12 by colloid. Alternatively, the material of the protrusion 40 may be metal. The metal protrusion may be connected to the bottom plate 11 or the second side plate 12 by welding.

[0144] It can be understood that by locating the multiple protrusions 40 in the accommodating 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 bottom plate 11 and / or the second side plate 12, thereby avoiding the problem of displacement of the battery cell 280 due to scratches between the battery cell 280 and the bottom plate 11 and / or the second side plate 12, and having better reliability.

[0145] In another possible implementation, please refer to Fig. 9 and Fig.10 , Fig. 9 yes Figure 4 Another structural schematic diagram of the side shell 10 of the battery housing 100 is shown. Fig.10 is along Fig. 9 The schematic diagram of the partial cross section is shown as follows:

[0146] At least a portion of each of the plurality of protrusions 40 may be located within the accommodating cavity W. The protrusion 40 provided on the bottom plate 11 is not only protruding relative to the surface of the bottom plate 11 facing the accommodating cavity W, but also recessed relative to the surface of the bottom plate 11 facing away from the accommodating cavity W. The protrusion 40 provided on the second side plate 12 is not only protruding relative to the surface of the second side plate 12 facing the accommodating cavity W, but also recessed relative to the surface of the second side plate 12 facing away from the accommodating cavity W. Among them, the plurality of protrusions 40 may be connected to the bottom plate 11 and the second side plate 12 by means such as integral molding to form an integrated structure. Exemplarily, the material of the protrusion 40 may be metal. The metal convex bump may be connected to the bottom plate 11 or the second side plate 12 by a stamping process.

[0147] It can be understood that by making the multiple protrusions 40 protrude relative to the surface of the bottom plate 11 and the second side plate 12 toward the accommodating cavity W, and be recessed relative to the surface of the bottom plate 11 and the second side plate 12 facing away from the accommodating cavity W, the protrusions 40 can be made into a hollow structure, so that the multiple protrusions 40 can be prepared with less material on the basis of having sufficient strength to limit the movement of the battery cells 280 and apply a pre-tightening force to the battery cells 280, thereby saving the materials and production costs required for preparing the multiple protrusions 40, and facilitating improving the production efficiency of the battery casing 100.

[0148] Based on the above description, it should be understood that the multiple protrusions 40 can be set as a solid or hollow structure as needed. The characteristic parameters of the protrusions 40, such as the setting positions of the multiple protrusions 40, the spacing between two adjacent protrusions 40, the shape of the protrusions 40, the length of the protrusions 40, the width of the protrusions 40, the protrusion height of the protrusions 40 relative to the surface of the bottom plate 11 or the second side plate 12 facing the accommodating cavity W, can be selected according to the actual application of the multiple protrusions 40, and this embodiment does not impose strict restrictions on this.

[0149] See also Fig.11 , Fig.11 yes Figure 4 The top cover 20 of the battery housing 100 is shown in a schematic structural diagram at an angle.

[0150] The top cover 20 may have a pole through hole 21 and an explosion-proof valve through hole 22. The number of pole through holes 21 may be two, and the two pole through holes 21 may be spaced apart along the length direction of the top cover 20. Each pole through hole 21 may penetrate the top cover 20 along the thickness direction of the top cover 20, and is used to install a pole assembly 240. The explosion-proof valve through hole 22 may be located between the two pole through holes 21, and is spaced apart from the two pole through holes 21. The explosion-proof valve through hole 22 may penetrate the top cover 20 along the thickness direction of the top cover 20, and is used to install the explosion-proof valve assembly 250.

[0151] The top cover 20 may also have a first step structure 23. The first step structure 23 is located at the end of the length direction of the top cover 20. The first step structure 23 may have a first step surface 231, and the first step surface 231 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 set away from the side shell 10, and is used to overlap with part of the second side plate 12. There may be two first step structures 23, and the two first step structures 23 are respectively located at the two ends of the length direction of the top cover 20.

[0152] See also Fig.12 , Fig.12 yes Figure 4 The schematic diagram of the structure of the side shell 10 of the battery housing 100 is shown at an angle.

[0153] The bottom plate 11 can extend along the X direction, and the two ends arranged along the X direction are respectively connected to the two second side plates 12. 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 bottom 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 an end of the second body 121 away from the bottom plate 11, and the other end of the second connecting portion 122 extends in a direction away from the second body 121, and the second connecting portion 122 can be bent away from the accommodating cavity W. That is, the second connecting portion 122 is bent and connected to an end of the second body 121 away from the bottom 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.

[0154] The following description of the assembly of the top cover 20 and the second side panel 12 will be explained by taking the assembly of a first step structure 23 and a second connecting portion 122 as an example. In the absence of conflict, the following description of the assembly of a first step structure 23 and a second connecting portion 122 can be applied to the assembly of another first step structure 23 and a second connecting portion 122.

[0155] See also Fig.13 , Fig.13 yes Figure 4 The side shell 10 and the top cover 20 of the battery housing 100 are assembled to form a partial structural schematic diagram of the main housing 50.

[0156] When the side shell 10 and the top cover 20 are assembled to form the main shell 50 , part of the second connecting portion 122 of the second side plate 12 overlaps the first step structure 23 of the top cover 20 and is welded to the first step structure 23 to fix the top cover 20 to the second side plate 12 .

[0157] It can be understood that by overlapping the second connection portion 122 of the second side plate 12 with 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, so that the top cover 20 and the second side plate 12 can be welded together by using a seam welding process on the connection boundary between the first step structure 23 and the second connection portion 122. At the same time, the welding slag generated by the welding will be blocked by the first step structure 23 to avoid falling into the interior of the battery housing 100 and causing the battery cell assembly 220 located inside the battery housing 100 to short-circuit, which is beneficial to improving the safety performance of the battery 200. In addition, compared with the traditional penetration welding connection method, the seam welding has high detectability, high welding quality, can avoid cold welding, and can make the connection reliability between the top cover 20 and the second side plate 12 high, thereby ensuring that the battery cell assembly 220 and the pole can be stably electrically connected, thereby ensuring safety, and also ensuring that the battery 200 can be charged and discharged normally.

[0158] 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. That is, the first side plate 30 is connected to the main shell 50. Among them, the first side plate 30 can be sealed and connected with the main shell 50 by side welding all around, and the weld must overlap and 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 with the main shell 50 by laser penetration welding.

[0159] For a possible implementation, see Fig.14 , Fig.14 yes Figure 4 A structural schematic diagram of a welding portion 60 of a battery housing 100 is shown.

[0160] The battery housing 100 may further include a welding portion 60. The first side plate 30 may be sealed and connected to the main housing 50 through the welding portion 60, and the welding portion 60 may be arranged around the outer edge of the main housing 50. That is, the welding portion 60 is connected between the first side plate 30 and the main housing 50 and is arranged in a full circle. Exemplarily, the material of the welding portion 60 may be solder.

[0161] It can be understood that by welding the first side plate 30 and the main shell 50 in a full circle, the welding gap between the first side plate 30 and the main shell 50 is less likely to crack and break, and the welding connection between the first side plate 30 and the main shell 50 is firm, the welding yield is high, and it is beneficial to improve the sealing performance of the first side plate 30 and the main shell 50.

[0162] In this embodiment, please refer to Fig.15 , Fig.15 yes Figure 4 The structure schematic diagram of the first side plate 30 of the battery housing 100 at one angle is shown.

[0163] The following description will take the assembly of a first side panel 30 and the main shell 50 as an example. In the absence of conflict, the following description of the assembly of a first side panel 30 and the main shell 50 can be applied to the assembly of another first side panel 30 and the main shell 50.

[0164] The first side panel 30 can be arranged 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, that is, the first side surface 2810 of the battery cell 280. The first side panel 30 may include a first body 31, a first connecting portion 32 and a telescopic portion 33. The first body 31 may be the central area of ​​the first side panel 30, the first connecting portion 32 may be the edge area of ​​the first side panel 30, and the telescopic portion 33 may be the transition area of ​​the first side panel 30 connecting the first body 31 and the first connecting portion 32. The first side panel 30 may be any material that can meet welding requirements, realize shrinkage recovery, and can rebound when necessary. Exemplarily, the material of the first side panel 30 may be aluminum, carbon steel (such as model SPCC), stainless steel (such as model SUS304, SUS316, etc.), etc.

[0165] The first body 31 is used to abut against the first side surface 2810 of the battery cell 280. The first body 31 may be disposed opposite to the center of the first side surface 2810 of the battery cell 280. Exemplarily, the first body 31 may be rectangular.

[0166] The first connection portion 32 may be located at the periphery of the telescopic portion 33 and arranged around the circumferential direction of the first body 31. The first connection portion 32 may be arranged opposite to the edge of the first side surface 2810 of the battery cell 280. The first connection portion 32 may include a first surface 321 and a second surface 322. The first surface 321 is a surface of the first connection portion 32 facing the main housing 50, and the second surface 322 is a surface of the first connection 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 connection portion 32.

[0167] The first connection portion 32 and the first body 31 may be sequentially arranged in a direction perpendicular to the first body 31. In other words, in a direction perpendicular to the first body 31, a distance between the first connection portion 32 and the main housing 50 is smaller than a distance between the first body 31 and the main housing 50.

[0168] The first connection portion 32 can be used for welding with the main housing 50, that is, the first connection portion 32 can be used for welding with the top cover 20 and the side shell 10, that is, the first connection portion 32 can be used for welding with the top cover 20, the bottom plate 11 and the two second side plates 12. When the first connection portion 32 is welded with the main housing 50, the first surface 321 of the first connection portion 32 contacts with the main housing 50.

[0169] The telescopic portion 33 may be located at the periphery of the first body 31 and be bent and connected 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 circumferential direction of the first body 31. In a 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.

[0170] The telescopic portion 33 can have a certain degree of elongation and contraction performance, which can make the first body 31 displace relative to the first connection portion 32 in a direction perpendicular to the first body 31 (i.e., reciprocate). Specifically, the telescopic portion 33 can make the first body 31 rise relative to the first connection portion 32 and move away from the first connection portion 32 to adapt to the expansion of the battery cell 280. Alternatively, the telescopic portion 33 can make the first body 31 fall relative to the first connection portion 32 and move closer to the first connection portion 32 to adapt to the contraction of the battery cell 280.

[0171] 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 made between the first body 31 located in the central area of ​​the first side plate 30 and the first connecting portion 32 located in the edge area of ​​the first side plate 30. The stepped height difference area can reserve expansion space for the expansion of the battery cell 280, and the first body 31 can follow the expansion of the battery cell 280 through the telescopic performance of the telescopic portion 33. The displacement in the direction perpendicular to the first body 31 is conducive to loading the preload force on the battery cell 280. When the battery cell 280 is charged or the battery cell 280 is aged, the expansion of the center of the first side surface 2810 of the battery cell 280 is greater than the expansion of the edge of the first side surface 2810 of the battery cell 280, resulting in the first body 31 being driven by the center of the first side surface 2810 of the battery cell 280 to swell. At this time, the telescopic portion 33 is driven by the first body 31 to be pulled apart, forming a structure with a larger angle.

[0172] That is, the existence of the telescopic portion 33 can not only provide enough space for the expansion of the battery cell 280, but also provide the battery cell 280 with appropriate pre-tightening force in real time to adjust the pressure of the first side 2810 of the battery cell 280. When the gas generated by the battery cell 280 increases sharply, the telescopic portion 33 can be stretched to provide a buffer space for the sharply increased gas, ensure the normal opening of the explosion-proof valve assembly 250, improve the safety performance, and no additional buffer materials such as buffer pads or buffer sheets are required in the battery housing 100, thereby reducing the cost of the battery housing 100. In addition, for the battery 200 with relatively high pre-tightening force requirements, the pre-tightening force can be increased to make the battery cell assembly 220 in the battery 200 in close contact with the pole assembly 240, shorten the transmission distance of the active ions, reduce the internal resistance of the battery 200, and improve the charge and discharge performance of the battery 200.

[0173] like Fig.12As shown, in this embodiment, the maximum contraction depth of the telescopic portion 33 may be less than the distance H between the convex portion 40 and the connecting edge 125 of the second side panel 12 in a direction perpendicular to the first body 31. The connecting edge 125 of the second side panel 12 may be connected to the first side panel 30 and spaced apart from the convex portion 40. Exemplarily, the number of the connecting edges 125 may be two, and the two connecting edges 125 are spaced apart in the width direction (Y direction in the figure) of the second side panel 12.

[0174] It can be understood that when the telescopic part 33 is recessed and stored 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 action of the telescopic part 33 will not interfere with the protrusion 40, thereby avoiding the telescopic part 33 moving to the side and contacting the protrusion 40, causing interference between the protrusion 40 and the telescopic part 33 and affecting welding, and the telescopic part 33 abutting against the battery cell 280 and affecting the battery cell 280, thereby achieving better reliability.

[0175] Please refer to Fig.16a , Fig.16b and Fig.16c , Fig.16a is a schematic diagram of a state of the battery 200 provided in the first embodiment of the present application, Fig.16b is another schematic diagram of the battery 200 provided in the first embodiment of the present application in another state. Fig.16c This is another schematic diagram of the battery 200 provided in the first embodiment of the present application.

[0176] In this embodiment, the telescopic portion 33 may have an initial state, a first state, and a second state. Fig.16a As shown, the initial state of the expansion portion 33 is the initial state in which the battery cell 280 is not charged or discharged. Fig.16b As shown, the first state of the telescopic portion 33 is the fully charged state of the telescopic portion 33. Fig.16c As shown, the second state of the telescopic portion 33 is the fully opened state of the telescopic portion 33 .

[0177] When the telescopic portion 33 is in the first state, the telescopic portion 33 is elongated, and the minimum distance between the first connecting portion 32 and the first body 31 in the direction perpendicular to the first body 31 is the first distance D1. When the telescopic portion 33 is in the second state, the telescopic portion 33 is retracted, and the minimum distance between the first connecting portion 32 and the first body 31 in the direction perpendicular to the first body 31 is the second distance D2, and the second distance D2 is smaller than the first distance D1.

[0178] It is understandable that during the process of charging and discharging the battery cell 280 , the thickness of the battery cell 280 will expand to increase the thickness of the battery cell 280 or shrink to reduce the thickness of the battery cell 280 depending on the amount of electricity charged and discharged by the battery cell 280 .

[0179] Therefore, when the battery cell 280 expands, the battery cell 280 will become thicker, and the telescopic portion 33 will be driven and elongated by the first body 31 fixed to the battery cell 280. At this time, the first body 31 will expand outward and 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 exerting a good expansion resistance effect on the expansion of the battery cell 280, so that the tensile strength of the first side plate 30 can resist the expansion of the battery cell 280.

[0180] When the battery cell 280 is expanded and then contracts, the battery cell 280 will be reduced in thickness, and the telescopic portion 33 will be driven by the first body 31 fixed to the battery cell 280 and closed. At this time, the first body 31 will contract inward and approach the first connecting portion 32, so that the first body 31 and the first connecting portion 32 have a small distance in the direction perpendicular to the first body 31, and the first side plate 30 can still provide a good pre-tightening force for the battery cell 280, so that the connection between the first side plate 30 and the battery cell 280 remains tight and stable. In summary, by changing the state of the telescopic portion 33, the pre-tightening force of the battery cell 280 can be regulated, and the expansion force of the battery cell 280 can be well resisted, effectively ensuring the performance of the battery housing 100 during its working life.

[0181] See also Fig.17 , Fig.17 is along Figure 4 The section line CC shown is a schematic cross-sectional view of the partial structure shown.

[0182] In this embodiment, the telescopic portion 33 may include a first sub-portion 331 , a second sub-portion 332 , a third sub-portion 333 and a fourth sub-portion 334 .

[0183] One end of the first sub-portion 331 may be bent and connected to the first connecting portion 32, and the other end of the first sub-portion 331 may be bent and connected to one end of the second sub-portion 332. The first sub-portion 331 may extend from the first connecting portion 32 in a direction away from the first body 31, and is located on a side of the first connecting portion 32 away from the first body 31, that is, the first sub-portion 331 may be located on a side of the first surface 321 of the first connecting portion 32.

[0184] The other end of the second sub-portion 332 can be bent and connected to one end of the third sub-portion 333. The second sub-portion 332 can be arranged parallel to the first connecting portion 32 and located on the side of the first connecting portion 32 away from the first body 31, that is, the second sub-portion 332 can be located on one side of the first surface 321 of the first connecting portion 32.

[0185] The other end of the third sub-portion 333 may be bent and connected to one end of the fourth sub-portion 334, and the third sub-portion 333 may be perpendicular to the second sub-portion 332. Part of the third sub-portion 333 may be located on the side of the first connection portion 32 away from the first body 31, and part of the third sub-portion 333 may be located on the side of the first connection portion facing the first body 31. That is, part of the third sub-portion 333 may be located on one side of the first surface 321 of the first connection portion 32, and part of the third sub-portion 333 may be located on one side of the second surface 322 of the first connection portion.

[0186] The other end of the fourth sub-portion 334 may be bent and connected to the first body 31. When the telescopic portion 33 is in the second state, the second sub-portion 332 and the third sub-portion 333 may be elongated. Exemplarily, the telescopic portion 33 may extend in a Z shape.

[0187] It can be understood that by locating 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, which is beneficial for the telescopic portion 33 to adapt to the expansion trend of the battery cell 280 when the battery cell 280 expands and be smoothly pulled open, and for the telescopic portion 33 to better adapt to the deformation of the first side plate 30 following the expansion and contraction of the battery cell 280, thereby avoiding the problem of damage of the first side plate 30 due to plastic strain.

[0188] In this embodiment, the telescopic portion 33 may have a first corner T1, a second corner T2, and a third corner T3 that are sequentially arranged. The first corner T1 is bent toward the accommodating cavity W. The second corner T2 is bent toward the accommodating 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 is bent away from the accommodating cavity W. By providing multiple corners on the telescopic portion 33, the telescopic portion 33 can have a sufficient line length to meet the elongated space required for the battery cell 280 to expand.

[0189] Second embodiment:

[0190] Please refer to Fig.18 , Fig.19 , Fig. 20 and Fig.21 , Fig.18 is a schematic structural diagram of a second embodiment of a battery housing 100 provided in the present application, Fig.19 yes Fig.18 A structural schematic diagram of the first side plate 30 of the battery housing 100 is shown, Fig. 20 is along Fig.18 The schematic cross-sectional view obtained by cutting along the cutting line DD shown in FIG. Fig.21 It is a schematic diagram of a state of the battery 200 provided in the second embodiment of the present application.

[0191] In this embodiment, the same contents as those in the first embodiment are not repeated here. 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 housing 100 below can be applied to the first embodiment above unless there is a conflict.

[0192] The telescopic portion 33 may include a first sub-portion 331 , a second sub-portion 332 , a third sub-portion 333 , and a fourth sub-portion 334 .

[0193] One end of the first sub-portion 331 may be bent and connected to the first connecting portion 32, and the other end of the first sub-portion 331 may be bent and connected to one end of the second sub-portion 332. The first sub-portion 331 may extend from the first connecting portion 32 in a direction away from the first body 31, and is located on a side of the first connecting portion 32 away from the first body 31, that is, the first sub-portion 331 may be located on a side of the first surface 321 of the first connecting portion 32.

[0194] The other end of the second sub-portion 332 can be bent and connected to one end of the third sub-portion 333, and the extension direction of the second sub-portion 332 can be arranged obliquely with the first connecting portion 32. The second sub-portion 332 can extend from the other end of the first sub-portion 331 toward the first body 31. The second sub-portion 332 can be located on a side of the first connecting portion 32 away from the first body 31, that is, the second sub-portion 332 can be located on a side of the first surface 321 of the first connecting portion 32.

[0195] The other end of the third sub-portion 333 is bent and connected to one end of the fourth sub-portion 334. At least part of the third sub-portion 333 may be located on the side of the first connecting portion 32 facing the first body 31, that is, at least part of the third sub-portion 333 may be located on the side of the second surface 322 of the first connecting portion 32. The angle between the third sub-portion 333 and the second sub-portion 332 may be greater than the angle between the second sub-portion 332 and the first sub-portion 331.

[0196] The other end of the fourth sub-portion 334 is connected to the first body 31. The fourth sub-portion 334 is parallel to the first body 31 and is arranged coplanar with the first body 31. When the telescopic portion 33 is in the second state, the third sub-portion 333 and the fourth sub-portion 334 can be stretched.

[0197] It can be understood that by locating 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, which is beneficial for the telescopic portion 33 to adapt to the expansion trend of the battery cell 280 when the battery cell 280 expands and be smoothly pulled open, and for the telescopic portion 33 to better adapt to the deformation of the first side plate 30 following the expansion and contraction of the battery cell 280, thereby avoiding the problem of damage of the first side plate 30 due to plastic strain.

[0198] The telescopic portion 33 may have a first corner T1, a second corner T2, and a third corner T3 that are sequentially arranged. The first corner T1 is bent toward the accommodating cavity W. The second corner T2 is bent toward the accommodating 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 is bent away from the accommodating cavity W. By providing multiple corners on the telescopic portion 33, the telescopic portion 33 can have a sufficient line length to meet the elongated space required for the battery cell 280 to expand.

[0199] Third embodiment:

[0200] See also Fig. 22 , Fig. 22 1 is a schematic cross-sectional diagram of a partial structure of a third embodiment of a battery housing 100 provided in the present application.

[0201] In this embodiment, the same contents as those in the first embodiment are not repeated here. 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 housing 100 below can be applied to the first embodiment and the second embodiment above without conflict.

[0202] The telescopic portion 33 may include a first sub-portion 331 , a second sub-portion 332 , and a third sub-portion 333 .

[0203] One end of the first sub-portion 331 can be connected to the first connecting portion 32, and the other end of the first sub-portion 331 can be bent and connected to one end of the second sub-portion 332. The first sub-portion 331 is parallel to the first connecting portion 32 and is disposed coplanar with the first connecting portion 32.

[0204] The other end of the second sub-portion 332 can be bent and connected to one end of the third sub-portion 333. The second sub-portion 332 can extend in an S shape and be located on the side of the first connecting portion 32 facing the first body 31, that is, the second sub-portion 332 can be located on one side of the second surface 322 of the first connecting portion 32.

[0205] The other end of the third sub-portion 333 is connected to the first body 31. The third sub-portion 333 is parallel to the first body 31 and is disposed coplanar with the first body 31. When the telescopic portion 33 is in the second state, the second sub-portion 332 can be stretched.

[0206] It can be understood that by locating all the telescopic parts 33 on the side of the first connecting part 32 facing the first body 31, the telescopic parts 33 can be folded between the first body 31 and the first connecting part 32, which is beneficial for the telescopic parts 33 to adapt to the expansion trend of the battery cell 280 when the battery cell 280 expands and be pulled open smoothly, and for the telescopic parts 33 to better adapt to the deformation of the first side plate 30 following the expansion and contraction of the battery cell 280, thereby avoiding the problem of damage of the first side plate 30 due to plastic strain.

[0207] The telescopic portion 33 may have a first corner T1 and a second corner T2 which are sequentially arranged, and the bending direction of the first corner T1 and the bending direction of the second corner T2 are opposite. The first corner T1 is bent toward the accommodating cavity W. The second corner T2 is bent away from the accommodating cavity W. By providing multiple corners on the telescopic portion 33, the telescopic portion 33 may have a sufficient length to meet the elongated space required for the battery cell 280 to expand.

[0208] Fourth embodiment:

[0209] See also Fig.23 , Fig.23 1 is a schematic cross-sectional diagram of a partial structure of a fourth embodiment of a battery housing 100 provided in the present application.

[0210] In this embodiment, the same contents as those in the first embodiment are not repeated here. 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 housing 100 below can be applied to the first embodiment, the second embodiment and the third embodiment above unless there is a conflict.

[0211] The telescopic portion 33 may include a first sub-portion 331 , a second sub-portion 332 , and a third sub-portion 333 .

[0212] One end of the first sub-portion 331 can be connected to the first connecting portion 32, and the other end of the first sub-portion 331 can be bent and connected to one end of the second sub-portion 332. The first sub-portion 331 is parallel to the first connecting portion 32 and is disposed coplanar with the first connecting portion 32.

[0213] The other end of the second sub-portion 332 is bent and connected to one end of the third sub-portion 333. The second sub-portion 332 may extend in an S shape and be located on the side of the first connecting portion 32 facing the first body 31, that is, the second sub-portion 332 may be located on one side of the second surface 322 of the first connecting portion 32.

[0214] The other end of the third sub-portion 333 is bent and connected to one end of the fourth sub-portion 334. The third sub-portion 333 can be arranged parallel to the first sub-portion 331 and located on the side of the first connecting portion 32 facing the first body 31, that is, the third sub-portion 333 can be located on one side of the second surface 322 of the first connecting portion 32.

[0215] The other end of the fourth sub-portion 334 is bent and connected to the first body 31. The fourth sub-portion 334 and the first body 31 are arranged obliquely.

[0216] Part of the second sub-portion 332 , part of the third sub-portion 333 and part of the fourth sub-portion 334 are protruded relative to the first body 31 in a direction away from the accommodating cavity W. When the telescopic portion 33 is in the second state, the first sub-portion 331 and the second sub-portion 332 can be stretched.

[0217] It can be understood that by locating all the telescopic parts 33 on the side of the first connecting part 32 facing the first body 31, the telescopic parts 33 can be folded between the first body 31 and the first connecting part 32, which is beneficial for the telescopic parts 33 to adapt to the expansion trend of the battery cell 280 when the battery cell 280 expands and be pulled open smoothly, and for the telescopic parts 33 to better adapt to the deformation of the first side plate 30 following the expansion and contraction of the battery cell 280, thereby avoiding the problem of damage of the first side plate 30 due to plastic strain.

[0218] The telescopic portion 33 may have a first corner T1, a second corner T2, a third corner T3, and a fourth corner T4 which are sequentially arranged. The first corner T1 and the second corner T2 have opposite bending directions. The third corner T3 is bent away from the accommodating cavity W, and the fourth corner T4 is bent toward the accommodating cavity W. By providing multiple corners on the telescopic portion 33, the telescopic portion 33 can have a sufficient length to meet the elongated space required for the battery cell 280 to expand.

[0219] Fifth embodiment:

[0220] Please refer to Fig.24 , Fig.25 , Fig.26 and Fig. 27 , Fig.24 is a structural schematic diagram of a fifth embodiment of a battery housing 100 provided in the present application, Fig.25 yes Fig.24 The schematic diagram of the partial structure of the side shell 10 of the battery housing 100 shown in FIG. Fig.26 yes Fig.24 The schematic diagram of the partial structure of the first side plate 30 of the battery housing 100 is shown in FIG. Fig. 27 is along Fig.24 The schematic cross-sectional view is shown along the cutting line EE.

[0221] In this embodiment, the same contents as those in the first embodiment are not repeated here. The difference from the first embodiment is that the structures of the side shell 10 and the telescopic portion 33 of the first side plate 30 are different. In addition, the description of the battery housing 100 below can be applied to the first embodiment, the second embodiment, the third embodiment and the fourth embodiment above unless there is a conflict.

[0222] The top cover 20 may have a first step structure 23. The first step structure 23 is located at the end of the length direction of the top cover 20. The first step structure 23 may have a first step surface 231. The first step surface 231 may be parallel to the XY plane and disposed toward the second side plate 12. The first step 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. The number of the first step structures 23 may be two, and the two first step structures 23 are respectively located at the two ends of the length direction of the top cover 20.

[0223] 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, and the two second step structures 123 are respectively located at one end of the two first side plates 30 away from the bottom plate 11.

[0224] like Fig.25 As shown, 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 is overlapped on the second step structure 123 of the first side plate 30, and is seam-welded with 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 arranged opposite to each other.

[0225] It can be understood that by overlapping the second step structure 123 of the second side plate 12 on 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, so that the top cover 20 and the second side plate 12 can be welded together by using a seam welding process on the connection boundary of the first step structure 23 and the second step structure 123. At the same time, the welding slag generated by welding will be blocked by the first step structure 23 and the second step structure 123 to avoid falling into the interior of the battery housing 100 and causing the battery cell assembly 220 located inside the battery housing 100 to short-circuit, which is beneficial to improving the safety performance of the battery 200. In addition, compared with the traditional penetration welding connection method, the seam welding has high detectability, high welding quality, can avoid cold welding, and can make the connection reliability between the top cover 20 and the second side plate 12 high, thereby ensuring that the battery cell assembly 220 and the pole can be stably electrically connected, thereby ensuring safety, and also ensuring that the battery 200 can be charged and discharged normally.

[0226] like Fig.26 and Fig. 27 As shown, in this embodiment, other structures in the first body 31 can refer to the relevant description of the first embodiment, and only the differences between this embodiment and the first embodiment will be described below.

[0227] The telescopic portion 33 may include a first sub-portion 331 , a second sub-portion 332 , a third sub-portion 333 , and a fourth sub-portion 334 .

[0228] One end of the first sub-portion 331 may be bent and connected to the first connecting portion 32, and the other end of the first sub-portion 331 may be bent and connected to one end of the second sub-portion 332. The first sub-portion 331 may extend from the first connecting portion 32 in a direction away from the first body 31, and is located on a side of the first connecting portion 32 away from the first body 31, that is, the first sub-portion 331 may be located on a side of the first surface 321 of the first connecting portion 32.

[0229] The other end of the second sub-portion 332 can be bent and connected to one end of the third sub-portion 333. The second sub-portion 332 can be arranged parallel to the first connecting portion 32 and located on the side of the first connecting portion 32 away from the first body 31, that is, the second sub-portion 332 can be located on one side of the first surface 321 of the first connecting portion 32.

[0230] The other end of the third sub-portion 333 can be bent and connected to one end of the fourth sub-portion 334, and the third sub-portion 333 can be arranged obliquely with the second sub-portion 332. Part of the third sub-portion 333 can be located on the side of the first connection portion 32 away from the first body 31, and part of the third sub-portion 333 can be located on the side of the first connection portion facing the first body 31. That is, part of the third sub-portion 333 can be located on one side of the first surface 321 of the first connection portion 32, and part of the third sub-portion 333 can be located on one side of the second surface 322 of the first connection portion.

[0231] The other end of the fourth sub-portion 334 may be connected to the first body 31. The fourth sub-portion 334 may be parallel to the first body 31 and arranged coplanarly with the first body 31. When the telescopic portion 33 is in the second state, the second sub-portion 332 and the third sub-portion 333 may be elongated. Exemplarily, the telescopic portion 33 may extend in a Z shape.

[0232] It can be understood that by locating 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, which is beneficial for the telescopic portion 33 to adapt to the expansion trend of the battery cell 280 when the battery cell 280 expands and be smoothly pulled open, and for the telescopic portion 33 to better adapt to the deformation of the first side plate 30 following the expansion and contraction of the battery cell 280, thereby avoiding the problem of damage of the first side plate 30 due to plastic strain.

[0233] The telescopic portion 33 may have a first corner T1, a second corner T2, and a third corner T3 which are sequentially arranged. The first corner T1 is bent away from the accommodating cavity W. The second corner T2 is bent toward the accommodating cavity W. The third corner T3 is bent away from the accommodating cavity W, and the bending direction of the third corner T3 is different from the bending direction of the first corner T1. By providing multiple corners on the telescopic portion 33, the telescopic portion 33 can have a sufficient length to meet the elongated space required for the battery cell 280 to expand.

[0234] Sixth embodiment:

[0235] Please refer to Fig.28 , Fig.29 , Fig.30 and Fig.31 , Fig.28 is a schematic structural diagram of a sixth embodiment of a battery housing 100 provided in the present application, Fig.29 yes Fig.28 The schematic diagram of the partial structure of the side shell 10 of the battery housing 100 shown in FIG. Fig.30 yes Fig.28 The schematic diagram of the partial structure of the first side plate 30 of the battery housing 100 is shown in FIG. Fig.31 is along Fig.28 The schematic cross-sectional view is shown along the cutting line FF.

[0236] In this embodiment, the same contents as those in the first embodiment are not repeated here. The difference from the first embodiment is that the structures of the side shell 10 and the telescopic portion 33 of the first side plate 30 are different. In addition, the description of the battery housing 100 below can be applied to the first embodiment, the second embodiment, the third embodiment, the fourth embodiment and the fifth embodiment above unless there is a conflict.

[0237] 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 accommodating cavity W. The groove 24 is located at the end of the length direction of the top cover 20. There may be two grooves 24, which are respectively located at the two ends of the length direction of the top cover 20.

[0238] The second side plate 12 may include a second body 121 and a second connection portion 122. One end of the second body 121 is connected to the bottom plate 11, and the other end of the second body 121 may extend along the Z direction. One end of the second connection portion 122 is connected to an end of the second body 121 away from the bottom plate 11, and the other end of the second connection portion 122 extends in a direction away from the second body 121, and the second connection portion 122 may be bent away from the accommodating cavity W. That is, the second connection portion 122 is bent and connected to an end of the second body 121 away from the bottom plate 11. The second connection portion 122 may be used to connect to the top cover 20. Exemplarily, the shape of the second connection portion 122 may be arc-shaped.

[0239] like Fig.29 As shown, when the side shell 10 and the top cover 20 are assembled to form the main shell 50, part of the second connecting portion 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 to fix the top cover 20 to the second side plate 12.

[0240] It can be understood that by covering part of the second connecting portion 122 of the second side plate 12 by the top cover 20, the connecting boundary between the second side plate 12 and the top cover 20 can be blocked by the top cover 20, so that the welding slag generated by the welding of the top cover 20 and the second side plate 12 will be blocked by the second connecting portion 122 of the second side plate 12, and prevented from falling into the interior of the battery casing 100 and causing a short circuit in the battery cell assembly 220 located inside the battery casing 100, which is beneficial to improving the safety performance of the battery 200.

[0241] like Fig.30 As shown, the extension direction of the first connection portion 32 of the first side plate 30 intersects with the extension direction of the first body 31. When the first side plate 30 is assembled with the main housing 50, the first connection portion 32 of the first side plate 30 is welded with the main housing 50 to fix the first side plate 30 with the main housing 50.

[0242] It can be understood that, compared with the traditional penetration welding connection method, the seam welding has high detectability, high welding quality, can avoid cold welds, and can make the connection between the first side plate 30 and the main shell 50 highly reliable, thereby ensuring the stable electrical connection between the battery cell assembly 220 and the pole, thereby ensuring safety, and also ensuring that the battery 200 can be charged and discharged normally.

[0243] like Fig.30 and Fig.31 As shown, in this embodiment, the telescopic portion 33 may include a first sub-portion 331 , a second sub-portion 332 and a third sub-portion 333 .

[0244] One end of the first sub-portion 331 is bent and connected to the first connecting portion 32, and the other end of the first sub-portion 331 is bent and connected to one end of the second sub-portion 332. The extension direction of the first sub-portion 331 is parallel to the first body 31. The other end of the second sub-portion 332 is bent and connected to one end of the third sub-portion 333, and the extension direction of the second sub-portion 332 is inclined to the first body 31. The other end of the third sub-portion 333 is connected to the first body 31. The extension direction of the third sub-portion 333 is parallel to the first body 31, and is coplanar with the first body 31. When the telescopic portion 33 is in the second state, the first sub-portion 331 and the second sub-portion 332 can be stretched.

[0245] It can be understood that by folding the telescopic portion 33 between the first body 31 and the first connecting portion 32, when the battery cell 280 expands, the telescopic portion 33 can adapt to the expansion trend of the battery cell 280 and can be smoothly pulled open, and the telescopic portion 33 can better adapt to the deformation of the first side plate 30 following the expansion and contraction of the battery cell 280, thereby avoiding the problem of damage of the first side plate 30 due to plastic strain.

[0246] The telescopic portion 33 may have a first corner T1 and a second corner T2 which are arranged in sequence. The first corner T1 is bent toward the accommodating cavity W. The second corner T2 is bent away from the accommodating cavity W. By providing multiple corners on the telescopic portion 33, the telescopic portion 33 may have a sufficient length to meet the elongated space required for the battery cell 280 to expand.

[0247] The embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. At the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A battery, characterized in that: The battery comprises: A battery cell, the battery cell comprising two first side surfaces and two second side surfaces, the two first side surfaces are spaced apart along a width direction of the battery, the two second side surfaces are spaced apart along a length direction of the battery, each second side surface is connected between the two first side surfaces, and an area of ​​the first side surface is greater than an area of ​​the second side surface; and A battery housing, wherein the battery housing has a receiving cavity, the battery cell is located in the receiving cavity, and the battery housing comprises a top cover, a side shell and two first side plates; The top cover is welded to the battery core; The side shell is welded to the top cover, the side shell comprises a bottom plate and two second side plates, the bottom plate and the top cover are spaced apart in the height direction of the battery, the two second side plates are spaced apart in the length direction of the battery, one end of each second side plate is connected to the bottom plate, the other end of each second side plate is connected to the top cover, each second side plate is arranged opposite to one second side surface, the bottom plate, one second side plate, the top cover and another second side plate are sequentially connected to form a main shell; The two first side plates are arranged at intervals along the width direction of the battery, the two first side plates are arranged opposite to the two first side surfaces respectively, and the two first side plates are respectively abutted against the oppositely arranged first side surfaces, at least one of the first side plates is welded to the main shell, and the weld mark of the first side plate welded to the main shell is an annular weld mark.

2. The battery according to claim 1, characterized in that The top cover has a first step structure, which is located at the end of the top cover in the length direction. The second side panel 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 an end of the second body away from the bottom plate. Part of the second connecting portion overlaps the first step structure and is welded to the first step structure to fix the top cover to the second side panel.

3. The battery according to claim 1, characterized in that The top cover has a first step structure, which is located at the end of the top cover in the length direction, and the second side panel has a second step structure, which is located at the end of the second side panel away from the bottom panel. The first step structure is overlapped on the second step structure and is welded to the second step structure to fix the top cover to the second side panel.

4. The battery according to claim 1, characterized in that The top cover has a groove, the opening of the groove is located on the surface of the top cover facing the accommodating cavity, and 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, and the second connecting portion is bent and connected to an end of the second body away from the bottom plate. Part of the second connecting portion is located in the groove and is covered by the top cover and welded to the top cover.

5. The battery according to any one of claims 1 to 4, characterized in that: The first side panel comprises a first body, a telescopic portion and a first connecting portion which are connected in sequence; The first body abuts against the first side surface; The first connecting portion is located at the periphery of the telescopic portion and is welded to the main shell; The telescopic portion is bent and connected between the outer edge of the first body and the inner edge of the first connecting portion, and the telescopic portion can cause the first body to move relative to the first connecting portion along a direction perpendicular to the first body.

6. The battery according to claim 5, characterized in that The telescopic portion has a first state and a second state; When the telescopic portion is in the first state, the telescopic portion is elongated, and in a direction perpendicular to the first body, a minimum distance between the first connecting portion and the first body is a first distance; When the telescopic portion is in the second state, the telescopic portion is retracted, and in a direction perpendicular to the first body, a minimum distance between the first connecting portion and the first body is a second distance, and the second distance is smaller than the first distance.

7. The battery according to claim 5, characterized in that The telescopic portion comprises a first sub-portion, a second sub-portion, a third sub-portion and a fourth sub-portion which are connected in sequence; One end of the first sub-part is bent and connected to the first connecting part, the other end of the first sub-part is bent and connected to one end of the second sub-part, and the first sub-part is located on a 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, and the second sub-part is parallel to the first connecting part and is located on a side of the first connecting part away from the first body; The other end of the third sub-section is bent and connected to one end of the fourth sub-section, the third sub-section is perpendicular to the second sub-section, part of the third sub-section is located on the side of the first connecting portion away from the first body, and part of the third sub-section is located on the side of the first connecting portion facing the first body; The other end of the fourth sub-part is bent and connected to the first body.

8. The battery according to claim 5, characterized in that The telescopic portion comprises a first sub-portion, a second sub-portion, a third sub-portion and a fourth sub-portion which are connected in sequence; One end of the first sub-part is bent and connected to the first connecting part, the other end of the first sub-part is bent and connected to one end of the second sub-part, and the first sub-part is located on a 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 with the first connecting part, and the second sub-part is located on a side of the first connecting part away from the first body; The other end of the third sub-section is bent and connected to one end of the fourth sub-section, at least part of the third sub-section is located on the side of the first connecting portion facing the first body, and the angle between the third sub-section and the second sub-section is greater than the angle between the second sub-section and the first sub-section; The other end of the fourth sub-section is connected to the first body. The fourth sub-section is parallel to the first body and is arranged coplanar with the first body.

9. The battery according to claim 5, characterized in that The telescopic portion comprises a first sub-portion, a second sub-portion and a third sub-portion connected in sequence; One end of the first sub-portion is connected to the first connecting portion, the other end of the first sub-portion is bent and connected to one end of the second sub-portion, and the first sub-portion is parallel to the first connecting portion and is arranged coplanar with the first connecting portion; The other end of the second sub-section is bent and connected to one end of the third sub-section, and the second sub-section extends in an S shape and is located on a side of the first connecting portion facing the first body; The other end of the third sub-section is connected to the first body, and the third sub-section is parallel to the first body and is arranged coplanar with the first body.

10. The battery according to claim 5, characterized in that The telescopic portion comprises a first sub-portion, a second sub-portion, a third sub-portion and a fourth sub-portion which are connected in sequence; One end of the first sub-portion is connected to the first connecting portion, the other end of the first sub-portion is bent and connected to one end of the second sub-portion, and the first sub-portion is parallel to the first connecting portion and is arranged coplanar with the first connecting portion; The other end of the second sub-section is bent and connected to one end of the third sub-section, and the second sub-section extends in an S shape and is located on a side of the first connecting portion facing the first body; The other end of the third sub-section is bent and connected to one end of the fourth sub-section, and the third sub-section is arranged in parallel with the first sub-section and is located on a side of the first connecting portion facing the first body; The other end of the fourth sub-section is bent and connected to the first body, and the fourth sub-section and the first body are arranged obliquely; Part of the second sub-portion, part of the third sub-portion and part of the fourth sub-portion are protruded relative to the first body in a direction away from the accommodating cavity.

11. The battery according to any one of claims 1 to 4, characterized in that: The first side panel comprises a first body, a telescopic portion and a first connecting portion which are connected in sequence; The first body abuts against the first side surface; The first connection portion is located at the periphery of the telescopic portion and is welded to the main shell body, and the extension direction of the first connection portion intersects with the extension direction of the first body; The telescopic portion is bent and connected between the outer edge of the first body and the inner edge of the first connecting portion, and the telescopic portion can cause the first body to move relative to the first connecting portion along a direction perpendicular to the first body.

12. The battery according to claim 11, characterized in that The battery case also includes a plurality of protrusions, which are spaced apart on the bottom plate, protrude relative to the bottom plate on the surface of the accommodating cavity, and are used to contact the battery cells; or, the plurality of protrusions are spaced apart on the two second side plates, protrude relative to the two second side plates on the surface of the accommodating cavity, and are used to contact the battery cells; or, the plurality of protrusions are spaced apart on the bottom plate and the two second side plates, protrude relative to the bottom plate and the two second side plates on the surface of the accommodating cavity, and are used to contact the battery cells.

13. The battery according to claim 12, characterized in that The plurality of protrusions are all located in the accommodating cavity; One end of the convex portion provided on the bottom plate is connected to the surface of the bottom plate facing the accommodating cavity, and the other end of the convex portion provided on the bottom plate is used to contact the battery core; One end of the convex portion provided on the second side plate is connected to the surface of the second side plate facing the accommodating cavity, and the other end of the convex portion provided on the second side plate is used to contact the battery core.

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

15. A battery module, characterized in that: The battery module comprises the battery as claimed in any one of claims 1 to 14, wherein the battery casing of the battery is used to contact the battery cell of the battery after being subjected to force.

16. An electrical equipment, characterized in that: The electrical equipment comprises the battery module as claimed in claim 15.

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