Battery monomer, battery and electric equipment

Abstract

The utility model relates to a battery monomer, a battery and electric equipment, the battery monomer comprises a cover body, a shell and a reinforcing structure, the shell is provided with an opening part, and the cover body is welded to the opening part; in the height direction of the shell, the shell is divided into a heat affected zone and a body zone located below the heat affected zone, and the reinforcing structure is arranged in the heat affected zone; the reinforcing structure comprises at least one reinforcing part, and the reinforcing part is a protrusion arranged on the inner wall of the shell in a protruding mode. The battery comprises the battery monomer. The electric equipment comprises the battery. According to the battery monomer, the battery and the electric equipment, the reinforcing structure is arranged in the heat affected zone of the shell, so that the compressive strength and the structural strength of the heat affected zone are improved, the deformation force borne by the heat affected zone can be decomposed, the deformation of the heat affected zone caused by gas production in the shell or welding heating is reduced, and the connection quality of the shell and the cover body is favorably improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a battery cell, a battery and an electrical device. Background Art

[0002] With the popularization and promotion of new energy vehicles, the charging and discharging performance, endurance ability, etc. of new energy vehicles have attracted increasing attention and emphasis. As the power source of new energy vehicles, batteries are widely used. In a battery, the battery cell includes a cover body and a housing, and the cover body and the housing are sealed by welding, and the two form a space for placing an electrode assembly.

[0003] During the operation of the battery, due to reasons such as electrochemical reactions inside the battery cell, the battery cell expands, or when stress is applied to the battery cell, the cover body and the housing are prone to break under the action of stress in the heat affected zone formed by welding, and the battery cell is prone to expand and deform, thereby affecting the use of the battery cell. Summary of the Utility Model

[0004] Based on this, in view of the problem of poor connection structure strength of the battery cell, it is necessary to provide a battery cell, a battery and an electrical device.

[0005] A battery cell includes a cover body, a housing and a strengthening structure. The housing has an opening, and the cover body is welded to the opening. Along the height direction of the housing, the housing is divided into a heat affected zone and a body zone located below the heat affected zone, and the strengthening structure is arranged in the heat affected zone. Wherein, the strengthening structure includes at least one strengthening part, and the strengthening part is a protrusion protruding from the inner wall of the housing. For the above battery cell, by arranging a strengthening structure in the heat affected zone of the housing, the compressive strength and structural strength of the heat affected zone are improved, the deformation force received by the heat affected zone can be decomposed, and the deformation caused by gas production inside the housing or welding heating in the heat affected zone can be reduced, which is beneficial to improving the connection quality between the housing and the cover body.

[0006] In some embodiments, the strengthening part is a protrusion protruding from the inner wall of the housing towards the inside of the housing, and the arched surface of the strengthening part is an arc surface. In this way, the deformation force received by the heat affected zone is utilized by the arched structure, the compressive strength and structural strength of the heat affected zone are improved, and the deformation caused by high heat in the heat affected zone is reduced.

[0007] In some embodiments, the arch height H of the strengthening part 0 and the span L of the strengthening part 0 The ratio range is 2 / 3 to 1 / 3. In this way, on the basis that the strengthening part is not easily deformed under pressure, it can be ensured that the strengthening part does not occupy too much internal space of the housing, does not hinder the accommodation of the electrode assembly inside the housing, and makes the structure of the housing more compact and reasonable.

[0008] In some embodiments, the arch height H of the strengthening part0 The ratio to the span L of the strengthening part 0 is 1 / 2. In this way, the strengthening part can bear a large pressure without deformation, and at the same time, the occupied space of the strengthening part can be minimized as much as possible.

[0009] In some embodiments, the strengthening structure includes at least two strengthening parts, and all the strengthening parts are arranged side by side and spaced apart on the inner wall of the housing. In this way, the strengthening parts can be reasonably arranged according to requirements to further improve the compressive strength and structural strength of the heat-affected zone and reduce the deformation caused by high heat in the heat-affected zone.

[0010] In some embodiments, all the strengthening parts are configured as dot structures. In this way, the heat dissipation area can be increased, which is beneficial to the heat dissipation of the heat-affected zone when the temperature rises due to welding or other factors.

[0011] In some embodiments, all the strengthening parts are strip structures, and the strip structures extend along the height direction of the housing. In this way, the heat dissipation area can be increased, which is beneficial to the heat dissipation of the heat-affected zone when the temperature rises due to welding or other factors.

[0012] In some embodiments, the heat-affected zone has at least two strengthening parts in the height direction of the housing, and the distance between two adjacent strengthening parts in the height direction of the housing is d 0 , 4L 0 ≤d 0 ≤6L 0 . In this way, by limiting the distance between two adjacent strengthening parts in the height direction of the housing, the distribution density of the strengthening parts in the height direction of the heat-affected zone can be limited, which is beneficial to providing sufficient strengthening effect for the heat-affected zone.

[0013] In some embodiments, the battery cell further includes a lower insulating part, which is arranged on the side of the cover body facing the housing and is received in the housing. In this way, the insulation of the cover body and the electrode terminals can be realized, and the stability of the battery cell structure can be further improved.

[0014] In some embodiments, the outer side wall of the lower insulating part is spaced from the inner wall of the housing, and the distance therebetween is D, H 0 <D. In this way, the strengthening part does not contact the outer side wall of the lower insulating part, and there is no mutual interference between the strengthening part and the lower insulating part, so that the assembly of the electrode assembly into the housing and the cover body is not affected, and the rationality of the housing structure is improved.

[0015] In some of these embodiments, the heat affected zone has at least two reinforcing portions in the height direction of the housing, and the distribution of each reinforcing portion in the height direction of the housing does not exceed a first distribution boundary; wherein, the first distribution boundary is the higher one of the bottom edge of the lower insulating member and the bottom edge of the heat affected zone. In this way, the distribution of each reinforcing portion in the height direction of the housing always does not exceed the height range of the lower insulating member, so that the assembly of the electrode assembly into the housing and the cover is not affected, and it is beneficial to improve the space utilization rate of the battery cell.

[0016] In some of these embodiments, the housing includes a housing bottom surface, two large housing surfaces oppositely arranged in a first direction, and two housing side surfaces oppositely arranged in a second direction, and the first direction, the second direction and the height direction of the housing intersect pairwise; the housing bottom surface, the two large housing surfaces and the two housing side surfaces enclose a cavity, and the cavity has an opening. In this way, a cavity with an opening can be formed so that the electrode assembly is placed through the opening and received in the cavity.

[0017] In some of these embodiments, the dimension of the housing in the first direction is length L, and the dimension of the housing in the second direction is width W; when W > 1 / 5L, a reinforcing structure is provided in the heat affected zone of any one of the large housing surfaces and the heat affected zone of any one of the housing side surfaces; when W ≤ 1 / 5L, a reinforcing structure is provided in the heat affected zone of any one of the large housing surfaces. In this way, according to the ratio of the length to the width of the housing, the reinforcing structure can be flexibly selected to be provided in the heat affected zone of the housing side surface and / or the large housing surface, saving costs and being beneficial to providing sufficient strengthening effect for the heat affected zone.

[0018] In some of these embodiments, the reinforcing structure is also provided in the body area of any one of the large housing surfaces. In this way, the deformation force received by the body area of the large housing surface can be decomposed, and the deformation of the body area of the large housing surface caused by gas generation or welding heating inside the housing can be reduced.

[0019] In some of these embodiments, the body area of any one of the large housing surfaces has at least two reinforcing portions in the first direction, and the distribution of each reinforcing portion in the first direction does not exceed a second distribution boundary; the distance between the second distribution boundary and the edge of the large housing surface in the first direction is D1, and 1 / 5L ≤ D1 ≤ L. In this way, the distribution of each reinforcing portion in the first direction has a certain distance from the edge of the large housing surface, so that the assembly of the electrode assembly into the housing and the cover is not affected.

[0020] In some of these embodiments, the body area of any one of the large housing surfaces has at least two reinforcing portions in the second direction, and the distribution of each reinforcing portion in the second direction does not exceed a third distribution boundary; the distance between the third distribution boundary and the edge of the large housing surface in the second direction is D2, and 1 / 5W ≤ D2 ≤ W. In this way, the distribution of each reinforcing portion in the second direction has a certain distance from the edge of the large housing surface, so that the assembly of the electrode assembly into the housing and the cover is not affected.

[0021] In some of these embodiments, a strengthening structure is also provided in the body area on any side surface of the shell. In this way, the deformation force received by the body area on the side surface of the shell can be decomposed, and the deformation of the body area on the side surface of the shell caused by gas generation or welding heating inside the shell can be reduced.

[0022] In some of these embodiments, a strengthening structure is also provided on any bottom surface of the shell. In this way, the deformation force received by the bottom surface of the shell can be decomposed, and the deformation of the bottom surface of the shell caused by gas generation or welding heating inside the shell can be reduced.

[0023] In some of these embodiments, the bottom surface of the shell includes a flat portion and chamfered portions located at both ends of the flat portion in a first direction; in the height direction of the shell, the arch height H of the strengthening portion 0 < the height H of the chamfered portion 1 , and a bottom support plate is covered on the side of the bottom surface of the shell facing the cover body, and the bottom support plate has a groove that is inserted and cooperated with the strengthening portion. In this way, in the height direction of the shell, the arch height H of the strengthening portion 0 < the height H of the chamfered portion 1 , the electrode assembly is supported by the bottom support plate, so that the electrode assembly can be lifted, and the probability of the electrode assembly being interfered by the chamfered portion is reduced.

[0024] A battery includes the above-mentioned battery cell. The above-mentioned battery improves the compressive strength and structural strength of the heat affected zone of the battery cell, reduces the deformation of the heat affected zone caused by gas generation or welding heating inside the shell, and is beneficial to improving the connection quality between the shell and the cover body.

[0025] An electrical device includes the above-mentioned battery. The above-mentioned electrical device improves the compressive strength and structural strength of the heat affected zone of the battery cell, reduces the deformation of the heat affected zone caused by gas generation or welding heating inside the shell, and is beneficial to improving the connection quality between the shell and the cover body. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of an electrical device in some embodiments of the present application.

[0027] Figure 2 It is a schematic diagram of a battery in some embodiments of the present application.

[0028] Figure 3 It is a schematic diagram of a battery cell in some embodiments of the present application.

[0029] Figure 4 is Figure 3 a left view of the battery cell shown.

[0030] Figure 5 is Figure 3 a cross-sectional view of the battery cell shown.

[0031] Figure 6 isFigure 5 Partial enlarged view of the battery cell at location A as shown

[0032] Figure 7 is Figure 5 Partial enlarged view of the battery cell at location B as shown

[0033] Figure 8 Schematic diagram of the reinforcement structure in some embodiments of the present application

[0034] Figure 9 Schematic diagram of the reinforcement structure in other embodiments of the present application

[0035] Reference numerals

[0036] 10, vehicle; 11, controller; 12, motor; 20, battery; 21a, first part; 21b, second part; 21, battery box; 22, battery cell; 100, cover; 200, housing; 201, opening; 202, heat affected zone; 203, body zone; 204, cavity; 210, bottom surface of the housing; 211, flat part; 212, chamfered part; 220, large surface of the housing; 230, side surface of the housing; 300, reinforcement structure; 310, reinforcement part; 400, lower insulating part; 500, electrode terminal Detailed implementation manners

[0037] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, and thus are only examples and cannot be used to limit the protection scope of the present application

[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above accompanying drawings are intended to cover non-exclusive inclusion

[0039] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality" means more than two unless otherwise specifically defined

[0040] References to "embodiments" in this document mean that the specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0041] In the description of the embodiments of the present application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally represents an "or" relationship between the associated objects before and after.

[0042] In the description of the embodiments of the present application, the term "plural" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0043] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0044] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0045] With the popularization and promotion of new energy vehicles, the charging and discharging performance, endurance ability, etc. of new energy vehicles have attracted increasing attention and emphasis. As the power source of new energy vehicles, batteries are widely used. In a battery, the battery cell includes a cover body and a housing, and the cover body and the housing are closed by welding, and the two form a space for placing the electrode assembly.

[0046] During the operation of the battery, due to reasons such as the electrochemical reaction inside the battery cell, the battery cell expands, or when stress is applied to the battery cell, the welded heat - affected zone formed by welding between the cover and the housing is prone to break under the action of stress, and the battery cell is prone to expand and deform, thus affecting the use of the battery cell.

[0047] Based on the above considerations, through in - depth research, this application designs a battery cell, a battery, and an electrical device. In the battery cell, by arranging a strengthening structure in the heat - affected zone of the housing, the compressive strength and structural strength of the heat - affected zone are improved, the deformation force received by the heat - affected zone can be decomposed, the deformation caused by gas production inside the housing or welding heating in the heat - affected zone is reduced, which is beneficial to improving the connection quality between the housing and the cover.

[0048] The battery box disclosed in the embodiments of this application can be used in electrical devices such as vehicles, ships, or aircraft, etc., but is not limited thereto.

[0049] This application provides an electrical device powered by a battery. The electrical device can be, but is not limited to, vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and power tools, etc. The vehicle can be a fuel - powered vehicle, a gas - powered vehicle, or a new - energy vehicle. The new - energy vehicle can be a pure - electric vehicle, a hybrid vehicle, or an extended - range electric vehicle, etc.; the spacecraft includes airplanes, rockets, space shuttles, and spaceships, etc.; the electric toys include fixed or mobile electric toys, for example, game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, etc.; the power tools include metal - cutting power tools, grinding power tools, assembly power tools, and railway - use power tools, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact electric drills, concrete vibrators, and electric planers, etc.

[0050] For the convenience of description in the following embodiments, an electrical device in an embodiment of this application is taken as an example of vehicle 10 for illustration.

[0051] Please refer to Figure 1 , vehicle 10 can be a fuel - powered vehicle, a gas - powered vehicle, or a new - energy vehicle. The new - energy vehicle can be a pure - electric vehicle, a hybrid vehicle, or an extended - range electric vehicle, etc. The interior of vehicle 10 is provided with a battery 20. The battery 20 can be arranged at the bottom, head, or tail of vehicle 10. The battery 20 can be used for power supply of vehicle 10. For example, the battery 20 can be used as the operating power source of vehicle 10. Vehicle 10 can also include a controller 11 and a motor 12. The controller 11 is used to control the battery 20 to supply power to the motor 12. For example, it is used for the working power requirements during the start, navigation, and driving of vehicle 10.

[0052] In some embodiments of the present application, the battery 20 can not only serve as the operating power source of the vehicle 10, but also as the driving power source of the vehicle 10, replacing or partially replacing fuel or natural gas to provide driving force for the vehicle 10.

[0053] Please refer to Figure 2 , Figure 2 FIG. is an exploded view of the battery 20 provided in some embodiments of the present application. The battery 20 includes a battery box 21 and battery cells 22, and the battery cells 22 are accommodated in the battery box 21. Among them, the battery box 21 is used to provide an accommodation space for the battery cells 22. In some embodiments, the number of the battery boxes 21 is two, that is, the first part 21a and the second part 21b. The first part 21a and the second part 21b cover each other, and the first part 21a and the second part 21b jointly define an accommodation space for accommodating the battery cells 22. Of course, the accommodation space formed by the first part 21a and the second part 21b can be of various shapes, such as a cylinder, a cuboid, etc.

[0054] In the battery 20, there may be multiple battery cells 22, and the multiple battery cells 22 can be connected in series, parallel or in a hybrid connection. A hybrid connection means that there are both series and parallel connections among the multiple battery cells 22. The multiple battery cells 22 can be directly connected in series, parallel or in a hybrid connection together, and then the whole formed by the multiple battery cells 22 is accommodated in the battery box 21; of course, the battery 20 can also be in the form of multiple battery cells 22 first connected in series, parallel or in a hybrid connection to form battery 20 modules, and then the multiple battery 20 modules are connected in series, parallel or in a hybrid connection to form a whole and are accommodated in the battery box 21.

[0055] Among them, each battery cell 22 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 22 can be in the shape of a cylinder, a flat body, a cuboid or other shapes, and the embodiments of the present application are not limited thereto either.

[0056] Please refer to Figures 3 to 5 , in one embodiment, the battery cell 22 includes a cover body 100, a housing 200 and a strengthening structure 300. The housing 200 has an opening 201, and the cover body 100 is welded to the opening 201; along the height direction of the housing 200, the housing 200 is divided into a heat affected zone 202 and a body zone 203 located below the heat affected zone 202, and the strengthening structure 300 is arranged in the heat affected zone 202; among them, the strengthening structure 300 includes at least one strengthening part 310, and the strengthening part 310 is a protrusion protruding from the inner wall of the housing 200.

[0057] It should be noted that the height direction of the housing 200 is Figures 3 to 5 the Z direction shown in Figure 4In the Z direction shown, the heat - affected zone 202 is the upper region of the housing 200, and the body zone 203 is the lower region of the housing 200.

[0058] In the embodiments of the present application, the heat - affected zone 202 refers to the region where the strength changes significantly due to the high heat generated by internal gas production or welding heating, and the body zone 203 refers to the region where the strength changes little due to the high heat generated by welding. Optionally, the heat - affected zone 202 is defined as the region within 6 mm downward from the opening 201 to the opening 201, and the body zone 203 is defined as the region from the heat - affected zone 202 downward to the bottom edge of the housing 200.

[0059] In the embodiments of the present application, the housing 200 is used to form an internal environment, and the formed internal environment can be used to accommodate the electrode assembly, electrolyte, and other components. The housing 200 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal - prism - shaped, etc. Specifically, the shape of the housing 200 can be determined according to the specific shape and size of the electrode assembly. The material of the housing 200 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not limit this.

[0060] In the embodiments of the present application, the cover 100 refers to the component that covers the opening 201 of the housing 200 to isolate the internal environment of the battery cell 22 from the external environment. The cover 100 can be of various shapes and sizes. Specifically, the shape of the cover 100 is adapted to the shape of the housing 200 to cooperate with the housing 200. The material of the cover 100 can be various, for example, made of a material with a certain hardness and strength (such as aluminum alloy). When the cover 100 is subjected to extrusion and collision, it is not easily deformed, enabling the battery cell 22 to have higher structural strength.

[0061] In the embodiments of the present application, the housing 200 is provided with an opening 201 along its height direction. By welding the cover 100 to the opening 201 at one end of the housing 200, the sealing of the battery cell 22 is achieved. Optionally, the opening 201 is provided on the top side of the housing 200.

[0062] In the embodiments of the present application, the strengthening structure 300 is configured as a member for strengthening the strength of the housing 200. The strengthening structure 300 includes at least one strengthening portion 310, that is, the number of the strengthening portions 310 is not limited to one. Each strengthening portion 310 is a protrusion protruding from the inner wall of the housing 200, that is, each strengthening portion 310 protrudes towards the electrode assembly accommodated in the housing 200, and the shapes and sizes of the strengthening portions 310 can be the same or different.

[0063] The above-mentioned battery cell 22 can improve the compressive strength and structural strength of the heat-affected zone 202 by arranging a strengthening structure 300 in the heat-affected zone 202 of the housing 200, decompose the deformation force received by the heat-affected zone 202, reduce the deformation of the heat-affected zone 202 caused by gas generation or welding heating inside the housing 200, and is beneficial to improving the connection quality between the housing 200 and the cover 100.

[0064] According to some embodiments of the present application, please refer to Figure 5 and Figure 6 , the strengthening portion 310 is a protrusion protruding from the inner wall of the housing 200 toward the inside of the housing 200, and the arched surface of the strengthening portion 310 is an arc surface.

[0065] It should be noted that the cross-section J of the strengthening portion 310 is arched, and the arched surface of the arch faces the electrode assembly.

[0066] In the embodiments of the present application, the arched surface of the arch is an arc surface, and the radian of the arc surface here can be designed according to actual needs; for example, the arc surface can be designed as a semi-circular arc or a semi-elliptical arc.

[0067] Through the above settings, the deformation force received by the heat-affected zone 202 is utilized by the arched structure, the compressive strength and structural strength of the heat-affected zone 202 are improved, and the deformation of the heat-affected zone 202 caused by high heat is reduced.

[0068] According to some embodiments of the present application, please refer to Figure 6 , the arch height H of the strengthening portion 310 0 and the span L of the strengthening portion 310 0 The ratio range is 2 / 3 to 1 / 3.

[0069] In the embodiments of the present application, the arch height H 0 is defined as the height at which the arch top of the arch leaves the support point, and the size of the arch height determines the bending degree of the strengthening portion 310.

[0070] In the embodiments of the present application, the span L 0 is defined as the distance between two support points of the arch, and the size of the span determines the compressive capacity of the strengthening portion 310.

[0071] Through the above settings, on the basis that the strengthening portion 310 is not easily deformed under pressure, it is possible to take into account that the strengthening portion 310 does not occupy too much internal space of the housing 200, does not interfere with the accommodation of the electrode assembly inside the housing 200, and makes the structure of the housing 200 more compact and reasonable.

[0072] According to some embodiments of the present application, please refer to Figure 6 , the arch height H of the strengthening portion 310 0 and the span L of the strengthening portion 310 0 The ratio is 1 / 2.

[0073] With the above settings, the reinforcing portion 310 can withstand a large pressure without deformation, and at the same time, the occupied space of the reinforcing portion 310 can be minimized as much as possible.

[0074] According to some embodiments of the present application, please refer to Figure 5 , the reinforcing structure 300 includes at least two reinforcing portions 310, and all the reinforcing portions 310 are arranged side by side at intervals on the inner wall of the housing 200.

[0075] It should be noted that, in combination with reference to Figure 3 , the inner wall of the housing 200 includes a bottom surface 210 of the housing, a side surface 230 of the housing, and a large surface 220 of the housing. The bottom surface 210 of the housing, the side surface 230 of the housing, and the large surface 220 of the housing all include a heat-affected zone 202 and a body zone 203. At least two reinforcing portions 310 are arranged side by side at intervals in the heat-affected zone 202 of at least one of the bottom surface 210 of the housing, the side surface 230 of the housing, and the large surface 220 of the housing.

[0076] In the embodiments of the present application, all the reinforcing portions 310 can be arranged in a circular array, a rectangular array, or other irregular arrays. Optionally, all the reinforcing portions 310 are arranged side by side and equally spaced to facilitate uniform force application.

[0077] In the embodiments of the present application, the shapes and sizes of all the reinforcing portions 310 can be exactly the same to facilitate batch processing of the reinforcing portions 310; the shapes and sizes of all the reinforcing portions 310 can also be different to be set as needed according to different positions.

[0078] With the above settings, the reinforcing portions 310 can be reasonably arranged according to requirements to further improve the compressive strength and structural strength of the heat-affected zone 202 and reduce the deformation of the heat-affected zone 202 caused by high heat.

[0079] According to some embodiments of the present application, please refer to Figure 8 , all the reinforcing portions 310 are configured as dot-like structures.

[0080] In the embodiments of the present application, the outer contour of the dot-like structure is circular, oval, rectangular, square, or other irregular shapes. Here, the outer contour of the dot-like structure is not limited.

[0081] In the embodiments of the present application, the sizes of all the reinforcing portions 310 can be exactly the same or different.

[0082] With the above settings, the heat dissipation area can be increased, which is beneficial to the heat dissipation of the heat-affected zone 202 when the temperature rises due to welding or other factors.

[0083] According to some embodiments of the present application, please refer to Figure 9 , all the reinforcing portions 310 are strip-like structures, and the strip-like structures extend along the height direction of the housing 200.

[0084] In the embodiments of the present application, the outer contour of the strip structure is a long straight shape, a long wavy shape or other irregular shapes. Here, the outer contour of the strip structure is not limited.

[0085] In the embodiments of the present application, the sizes of all the reinforcing portions 310 may be exactly the same or may not be the same.

[0086] Through the above settings, the heat dissipation area can be increased, which is beneficial to the heat dissipation of the heat affected zone 202 when the temperature rises due to welding or other factors.

[0087] According to some embodiments of the present application, please refer to Figure 8 and Figure 6 , the heat affected zone 202 has at least two reinforcing portions 310 in the height direction of the housing 200, and the distance between two adjacent reinforcing portions 310 in the height direction of the housing 200 is d 0 , 4L 0 ≤d 0 ≤6L 0 .

[0088] It can be understood that in the height direction of the housing 200, the heat affected zone 202 has at least two spaced-apart reinforcing portions 310, and L 0 is the span of the reinforcing portion 310.

[0089] Preferably, the distance d between two adjacent reinforcing portions 310 in the height direction of the housing 200 0 is 5L 0 .

[0090] Through the above settings, by limiting the distance between two adjacent reinforcing portions 310 in the height direction of the housing 200, the distribution density of the reinforcing portions 310 of the heat affected zone 202 in the height direction of the housing 200 can be limited, which is beneficial to providing sufficient strengthening effect for the heat affected zone 202.

[0091] According to some embodiments of the present application, please refer to Figure 6 , the battery cell 22 further includes a lower insulating member 400, the lower insulating member 400 is disposed on the side of the cover 100 facing the housing 200, and the lower insulating member 400 is received in the housing 200.

[0092] In the embodiments of the present application, the battery cell 22 further includes an electrode terminal 500, the electrode terminal 500 penetrates through the cover 100 in the thickness direction of the cover 100, and is used for electrically connecting with the electrode assembly of the battery cell 22. The lower insulating member 400 is configured to isolate the cover 100 and the electrode terminal 500 to reduce the risk of short circuit. Exemplarily, the lower insulating member 400 may be plastic, rubber, etc.

[0093] In an embodiment of the present application, a groove may be provided on the side of the cover 100 facing the housing 200, so that the lower insulating member 400 can be received in the groove.

[0094] Through the above arrangement, insulation of the cover 100 and the electrode terminal 500 can be achieved, further improving the structural stability of the battery cell 22.

[0095] In some embodiments according to the present application, please refer to Figure 6 , the outer sidewall of the lower insulating member 400 is spaced from the inner wall of the housing 200, and the distance therebetween is D, H 0 <D.

[0096] It should be noted that H 0 is the arch height of the reinforcing portion 310, and H 0 <D, indicating that the reinforcing portion 310 does not contact the outer sidewall of the lower insulating member 400.

[0097] In an embodiment of the present application, the lower insulating member 400 is in the shape of a cuboid and has four outer sidewalls, and the housing 200 is in the shape of a cuboid and has four inner walls. The distance between each outer sidewall and the corresponding inner wall of the housing 200 is D.

[0098] Through the above arrangement, the reinforcing portion 310 does not contact the outer sidewall of the lower insulating member 400, and there is no mutual interference between the reinforcing portion 310 and the lower insulating member 400, so that the assembly of the electrode assembly into the housing and the cover 100 is not affected, improving the rationality of the structure of the housing 200.

[0099] In some embodiments according to the present application, please refer to Figure 8 , the heat affected zone 202 has at least two reinforcing portions 310 in the height direction of the housing 200, and the distribution of each reinforcing portion 310 in the height direction of the housing 200 does not extend beyond the first distribution boundary; wherein, the first distribution boundary is the higher one of the bottom edge of the lower insulating member 400 and the bottom edge of the heat affected zone 202.

[0100] It should be noted that the heat affected zone 202 has at least two reinforcing portions 310 in the height direction of the housing 200. Since the lower insulating member 400 has a certain height, when designing the distribution range of each reinforcing portion 310 in the height direction of the housing 200, it is necessary to consider how to utilize the space and make each reinforcing portion 310 not affect the assembly of the electrode assembly into the housing.

[0101] Here, the distribution of each reinforcing portion 310 in the height direction of the housing 200 does not extend beyond the first distribution boundary, and the first distribution boundary is the higher one of the bottom edge of the lower insulating member 400 and the bottom edge of the heat affected zone 202, that is, the distribution of each reinforcing portion 310 in the height direction of the housing 200 always does not exceed the height range of the lower insulating member 400.

[0102] For example, in the height direction of the housing 200, when the bottom edge of the lower insulating member 400 is lower than the bottom edge of the heat affected zone 202, the first distribution boundary line is the bottom edge of the heat affected zone 202, that is, the distribution of each reinforcing portion 310 in the height direction of the housing 200 does not extend beyond the bottom edge of the heat affected zone 202;

[0103] For example, in the height direction of the housing 200, when the bottom edge of the lower insulating member 400 is higher than the bottom edge of the heat affected zone 202, the first distribution boundary line is the bottom edge of the lower insulating member 400, that is, the distribution of each reinforcing portion 310 in the height direction of the housing 200 does not extend beyond the bottom edge of the lower insulating member 400.

[0104] Through the above settings, the distribution of each reinforcing portion 310 in the height direction of the housing 200 is always within the height range of the lower insulating member 400, so that the assembly of the electrode assembly into the housing and the cover 100 is not affected, and it is beneficial to improve the space utilization rate of the battery cell 22.

[0105] According to some embodiments of the present application, please refer to Figures 3 to 5 , the housing 200 includes a housing bottom surface 210, two housing large surfaces 220 oppositely arranged in a first direction, and two housing side surfaces 230 oppositely arranged in a second direction. The first direction and the second direction intersect with the height direction of the housing 200 in pairs; the housing bottom surface 210, the two housing large surfaces 220 and the two housing side surfaces 230 enclose a cavity 204, and the cavity 204 has an opening 201.

[0106] It should be noted that the first direction is the Figures 3 to 5 shown X direction, that is, the length direction of the housing 200; the second direction is the Figures 3 to 5 shown Y direction, that is, the width direction of the housing 200; the first direction, the second direction and the height direction of the housing 200 intersect in pairs and the three are not coplanar.

[0107] In the embodiments of the present application, the housing bottom surface 210, the two housing large surfaces 220 and the two housing side surfaces 230 enclose a cavity 204. The top side of the cavity 204 has an opening 201, and the cavity 204 is used to accommodate the electrode assembly.

[0108] In the embodiments of the present application, the housing bottom surface 210, the two housing large surfaces 220 and the two housing side surfaces 230 are all planar structures, and the outer contour of the planar structure is rectangular.

[0109] Through the above settings, a cavity 204 with an opening 201 can be formed, so that the electrode assembly is placed through the opening 201 and accommodated in the cavity 204.

[0110] According to some embodiments of the present application, please refer to Figure 3, the dimension of the housing 200 in the first direction is the length L, and the dimension of the housing 200 in the second direction is the width W; when W > 1 / 5L, the heat affected zone 202 of any large housing surface 220 and the heat affected zone 202 of any housing side surface 230 are both provided with a strengthening structure 300; when W ≤ 1 / 5L, the heat affected zone 202 of any large housing surface 220 is provided with a strengthening structure 300.

[0111] It can be understood that when W ≤ 1 / 5L, the width of the housing 200 is small, and the deformation of the housing side surface 230 is not significant compared with the deformation of the large housing surface 220. Here, the strengthening structure 300 can be provided only in the heat affected zone 202 of the large housing surface 220; when W > 1 / 5L, the deformation of the housing side surface 230 and the deformation of the large housing surface 220 both need to be considered. Here, the strengthening structure 300 is provided in the heat affected zone 202 of the large housing surface 220 and the heat affected zone 202 of the housing side surface 230.

[0112] Through the above settings, it is possible to flexibly select to provide the strengthening structure 300 in the heat affected zone 202 of the housing side surface 230 and / or the large housing surface 220 of the housing 200 according to the ratio of the length to the width of the housing 200, saving costs and facilitating providing sufficient strengthening effect for the heat affected zone 202.

[0113] According to some embodiments of the present application, please refer to Figures 3 to 4 , the strengthening structure 300 is also provided in the body area 203 of any large housing surface 220.

[0114] In the embodiments of the present application, there are at least two strengthening parts 310 in the body area 203 of any large housing surface 220, and all the strengthening parts 310 are arranged side by side and spaced apart in the body area 203 of any large housing surface 220. All the strengthening parts 310 can be arranged in a circular array, a rectangular array or other irregular arrays. Optionally, all the strengthening parts 310 are arranged side by side and equally spaced to facilitate uniform stress.

[0115] Through the above settings, the deformation force received by the body area 203 of the large housing surface 220 can be decomposed, and the deformation of the body area 203 of the large housing surface 220 caused by gas generation or welding heating inside the housing 200 can be reduced.

[0116] According to some embodiments of the present application, please refer to Figure 8 , there are at least two strengthening parts 310 in the body area 203 of any large housing surface 220 in the first direction, and the distribution of each strengthening part 310 in the first direction does not exceed the second distribution boundary F1; the distance between the second distribution boundary F1 and the edge of the large housing surface 220 in the first direction is D1, and 1 / 5L ≤ D1 ≤ L.

[0117] It should be noted that the body area 203 of the large shell surface 220 has at least two reinforcing parts 310 in the first direction. The distribution of each reinforcing part 310 in the first direction needs to consider how to utilize the space and ensure that each reinforcing part 310 does not affect the insertion of the electrode assembly into the shell.

[0118] Through the above settings, the distribution of each reinforcing part 310 in the first direction has a certain distance from the edge of the large shell surface 220, so that the insertion of the electrode assembly into the shell and the assembly of the cover body 100 are not affected.

[0119] According to some embodiments of the present application, please refer to Figure 8 , the body area 203 of any large shell surface 220 has at least two reinforcing parts 310 in the second direction. The distribution of each reinforcing part 310 in the second direction does not exceed the third distribution boundary line F2; the distance between the third distribution boundary line F2 and the edge of the large shell surface 220 in the second direction is D2, and 1 / 5W ≤ D2 ≤ W.

[0120] It should be noted that the body area 203 of the large shell surface 220 has at least two reinforcing parts 310 in the second direction. The distribution of each reinforcing part 310 in the second direction needs to consider how to utilize the space and ensure that each reinforcing part 310 does not affect the insertion of the electrode assembly into the shell.

[0121] Through the above settings, the distribution of each reinforcing part 310 in the second direction has a certain distance from the edge of the large shell surface 220, so that the insertion of the electrode assembly into the shell and the assembly of the cover body 100 are not affected.

[0122] According to some embodiments of the present application, please refer to Figure 6 , the reinforcing structure 300 is also provided in the body area 203 of any shell side surface 230.

[0123] In the embodiments of the present application, the body area 203 of any shell side surface 230 has at least two reinforcing parts 310. All the reinforcing parts 310 are arranged side by side and spaced apart in the body area 203 of the shell side surface 230. All the reinforcing parts 310 can be arranged in a circular array, a rectangular array or other irregular arrays. Optionally, all the reinforcing parts 310 are arranged side by side and equally spaced to facilitate uniform stress.

[0124] Through the above settings, the deformation force received by the body area 203 of the shell side surface 230 can be decomposed, and the deformation of the body area 203 of the shell side surface 230 caused by gas production or welding heating inside the shell 200 can be reduced.

[0125] According to some embodiments of the present application, please refer to Figure 5 , the reinforcing structure 300 is also provided on any shell bottom surface 210.

[0126] In the embodiments of the present application, there are at least two reinforcing portions 310 in the body region 203 of any shell bottom surface 210, and all the reinforcing portions 310 are arranged side by side and spaced apart on the shell bottom surface 210. All the reinforcing portions 310 can be arranged in a circular array, a rectangular array or other irregular arrays. Optionally, all the reinforcing portions 310 are arranged side by side and equally spaced to facilitate uniform stress.

[0127] Through the above settings, the deformation force received by the shell bottom surface 210 can be decomposed, and the deformation of the shell bottom surface 210 caused by gas generation or welding heating inside the shell 200 can be reduced.

[0128] In some embodiments according to the present application, please refer to Figure 5 and Figure 7 , the shell bottom surface 210 includes a flat portion 211 in the first direction and chamfered portions 212 located at both ends of the flat portion 211; in the height direction of the shell 200, the arch height H of the reinforcing portion 310 0 < chamfered portion 212 height H 1 , and a bottom support plate is covered on the side of the shell bottom surface 210 facing the cover body 100, and the bottom support plate has a groove for plugging and matching with the reinforcing portion 310.

[0129] It should be noted that in the height direction of the shell 200, the arch height H of the reinforcing portion 310 0 < chamfered portion 212 height H 1 , indicating that when the electrode assembly enters the shell, when the reinforcing portion 310 of the shell bottom surface 210 supports the electrode assembly, the end of the electrode assembly will be interfered by the chamfered portion 212 and bend or be damaged, and a bottom support plate is needed for support to raise the electrode assembly.

[0130] In the embodiments of the present application, the bottom support plate is arranged on the side of the shell bottom surface 210 facing the cover body 100 and is used to support the electrode assembly. The bottom support plate can be a flat plate or a cover body with a receiving cavity, and the structure of the bottom support plate is not limited here.

[0131] In the embodiments of the present application, the bottom support plate has a groove for plugging and matching with the reinforcing portion 310, so that the bottom support plate can be detachably arranged on the side of the shell bottom surface 210 facing the cover body 100. Among them, the groove is adapted to the shape of the reinforcing portion 310.

[0132] In the embodiments of the present application, the chamfered portion 212 is provided with a rounded corner, and the angle of the rounded corner can be designed according to actual needs.

[0133] Through the above settings, in the height direction of the shell 200, the arch height H of the reinforcing portion 310 0 < chamfered portion 212 height H 1 , the electrode assembly is supported by the bottom support plate, so that the electrode assembly can be raised, and the probability of the electrode assembly being interfered by the chamfered portion 212 is reduced.

[0134] Please refer to Figure 2 , the battery 20 in one embodiment includes the above-mentioned battery cell 22.

[0135] It should be noted that the battery 20 further includes a battery box 21, a thermal management component and other components, and the battery cell 22 is accommodated in the battery box 21.

[0136] For the above-mentioned battery 20, the compressive strength and structural strength of the heat affected zone 202 of the battery cell 22 are improved, the deformation of the heat affected zone 202 caused by gas production inside the housing 200 or welding heating is reduced, which is beneficial to improving the connection quality between the housing 200 and the cover 100.

[0137] Please refer to Figure 1 , an electrical device in one embodiment includes the above-mentioned battery 20.

[0138] For the above-mentioned electrical device, the compressive strength and structural strength of the heat affected zone 202 of the battery cell 22 are improved, the deformation of the heat affected zone 202 caused by gas production inside the housing 200 or welding heating is reduced, which is beneficial to improving the connection quality between the housing 200 and the cover 100.

[0139] According to some embodiments in the present application, see Figures 3 to 9 , the present application provides a battery cell 22, the battery cell 22 includes a cover 100, a housing 200, a strengthening structure 300 and a lower insulating member 400, the housing 200 includes a bottom surface 210 of the housing, two large surfaces 220 of the housing oppositely arranged in a first direction, and two side surfaces 230 of the housing oppositely arranged in a second direction. The two side surfaces 230, the bottom surface 210 of the housing, the two large surfaces 220 of the housing and the two side surfaces 230 enclose a cavity 204, the cavity 204 has an opening 201, and the cover 100 is welded to the opening 201; the strengthening structure 300 includes at least one strengthening portion 310, the strengthening portion 310 is a protrusion protruding from the inner wall of the housing 200, the cross-section of the strengthening portion 310 is arched, and the arch height H 0 and the span L of the strengthening portion 310 0 The ratio is 1 / 2, and the strengthening portions 310 are all configured as dot structures or strip structures; the lower insulating member 400 is disposed on the side of the cover 100 facing the housing 200, and the lower insulating member 400 is received in the housing 200. The outer side wall of the lower insulating member 400 is spaced from the inner wall of the housing 200 and the distance therebetween is D, H 0 < D.

[0140] Wherein, along the height direction of the housing 200, the housing 200 is divided into a heat affected zone 202 and a body zone 203 located below the heat affected zone 202, and the strengthening structure 300 is arranged in the heat affected zone 202; the heat affected zone 202 has at least two strengthening parts 310 in the height direction of the housing 200, and the distance between two adjacent strengthening parts 310 in the height direction of the housing 200 is d 0 , 4L 0 ≤d 0 ≤6L 0 , and the distribution of each strengthening part 310 in the height direction of the housing 200 does not exceed a first distribution boundary line, and the first distribution boundary line is the higher one of the bottom edge of the lower insulating part 400 and the bottom edge of the heat affected zone 202. The size of the housing 200 in the first direction is the length L, and the size of the housing 200 in the second direction is the width W; when W > 1 / 5L, the heat affected zone 202 of any large housing surface 220 and the heat affected zone 202 of any housing side surface 230 are both provided with the strengthening structure 300; when W ≤ 1 / 5L, the heat affected zone 202 of any large housing surface 220 is provided with the strengthening structure 300.

[0141] According to some embodiments of the present application, referring to Figure 2 , the present application provides a battery 20, and the battery 20 includes the above-mentioned battery cell 22.

[0142] According to some embodiments of the present application, referring to Figure 1 , the present application provides an electrical equipment, and the electrical equipment includes the above-mentioned battery 20.

[0143] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell (22), characterized in that: include: Cover body (100); A shell (200) having an opening (201), the cover (100) being welded to the opening (201); along the height direction of the shell (200), the shell (200) is divided into a heat-affected zone (202) and a body zone (203) located below the heat-affected zone (202); A reinforcement structure (300) disposed in the heat-affected zone (202); Wherein, the reinforcement structure (300) comprises at least one reinforcement portion (310), and the reinforcement portion (310) is a protrusion convexly provided on the inner wall of the shell (200).

2. The battery cell (22) according to claim 1, characterized in that: The reinforcing portion (310) is a protrusion that arches out from the inner wall of the shell (200) toward the inside of the shell (200), and the arched surface of the reinforcing portion (310) is a curved surface.

3. The battery cell (22) according to claim 2, characterized in that: The ratio of the arch height H0 of the reinforcement portion (310) to the span L0 of the reinforcement portion (310) ranges from 2 / 3 to 1 / 3.

4. The battery cell (22) according to claim 2, characterized in that: The ratio of the arch height H0 of the reinforcement portion (310) to the span L0 of the reinforcement portion (310) is 1 / 2.

5. The battery cell (22) according to claim 3, characterized in that: The reinforcement structure (300) comprises at least two reinforcement parts (310), and all of the reinforcement parts (310) are distributed side by side and at intervals on the inner wall of the housing (200).

6. The battery cell (22) according to claim 5, characterized in that: All of the reinforcements (310) are constructed as point-shaped structures.

7. The battery cell (22) according to claim 5, characterized in that: All of the reinforcement portions (310) are strip-shaped structures, and the strip-shaped structures extend along the height direction of the shell (200).

8. The battery cell (22) according to any one of claims 5 to 7, characterized in that: The heat-affected zone (202) has at least two reinforcement portions (310) in the height direction of the shell (200), and the distance between two adjacent reinforcement portions (310) in the height direction of the shell (200) is d0, and 4L0≤d0≤6L0.

9. The battery cell (22) according to claim 3, characterized in that: The battery cell (22) further comprises a lower insulating member (400), wherein the lower insulating member (400) is arranged on a side of the cover body (100) facing the shell (200), and the lower insulating member (400) is accommodated in the shell (200).

10. The battery cell (22) according to claim 9, characterized in that: The outer wall of the lower insulating member (400) is spaced apart from the inner wall of the housing (200), and the distance between the two is D, H0<D.

11. The battery cell (22) according to claim 9, characterized in that: The heat-affected zone (202) has at least two reinforcement portions (310) in the height direction of the shell (200), and the distribution of each reinforcement portion (310) in the height direction of the shell (200) does not exceed a first distribution boundary; The first distribution boundary is the one with a higher height between the bottom edge of the lower insulating member (400) and the bottom edge of the heat-affected zone (202).

12. The battery cell (22) according to claim 1, characterized in that: The shell (200) comprises a shell bottom surface (210), two shell large surfaces (220) arranged opposite to each other along a first direction, and two shell side surfaces (230) arranged opposite to each other along a second direction, wherein the first direction and the second direction intersect with the height direction of the shell (200) in pairs; The shell bottom surface (210), the two shell large surfaces (220) and the two shell side surfaces (230) are arranged to form a cavity (204), and the cavity (204) has the opening (201).

13. The battery cell (22) according to claim 12, characterized in that: The dimension of the shell (200) in the first direction is a length L, and the dimension of the shell (200) in the second direction is a width W; In the case where W>1 / 5L, the heat-affected zone (202) of any of the shell large surfaces (220) and the heat-affected zone (202) of any of the shell side surfaces (230) are both provided with the reinforcement structure (300); In the case where W≤1 / 5L, the heat-affected zone (202) of any of the shell large surfaces (220) is provided with the reinforcement structure (300).

14. The battery cell (22) according to claim 13, characterized in that: The reinforcement structure (300) is also provided in the main body region (203) of any one of the shell large surfaces (220).

15. The battery cell (22) according to claim 14, characterized in that: The body region (203) of any of the shell large surfaces (220) has at least two reinforcement portions (310) in the first direction, and the distribution of each reinforcement portion (310) in the first direction does not exceed a second distribution boundary line F1; The distance between the second distribution boundary line F1 and the edge of the shell large surface (220) in the first direction is D1, 1 / 5L≤D1≤L.

16. The battery cell (22) according to claim 14, characterized in that: The body region (203) of any of the shell large surfaces (220) has at least two reinforcement portions (310) in the second direction, and the distribution of each reinforcement portion (310) in the second direction does not exceed a third distribution boundary line F2; The distance between the third distribution boundary line F2 and the edge of the shell large surface (220) in the second direction is D2, 1 / 5W≤D2≤W.

17. The battery cell (22) according to claim 12, characterized in that: The reinforcement structure (300) is also provided in the body region (203) of any shell side surface (230).

18. The battery cell (22) according to claim 12, characterized in that: The reinforcement structure (300) is also provided on any one of the shell bottom surfaces (210).

19. The battery cell (22) according to claim 18, characterized in that: The shell bottom surface (210) comprises a straight portion (211) and chamfered portions (212) located at two ends of the straight portion (211) in the first direction; In the height direction of the shell (200), the arch height H0 of the reinforcing portion (310) is less than the height H1 of the chamfered portion (212), and a bottom support plate is provided on the side of the shell bottom surface (210) facing the cover body (100), and the bottom support plate has a groove for plugging and matching with the reinforcing portion (310).

20. A battery (20), characterized in that: Comprising a battery cell (22) as claimed in any one of claims 1 to 19.

21. An electrical equipment, characterized in that: Comprising a battery (20) as claimed in claim 20.

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