CN116231189B

CN116231189B - Box, battery and electric equipment

Info

Publication number: CN116231189B
Application number: CN202310487798.6A
Authority: CN
Inventors: 勾雪; 李艳磊
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2023-05-04
Filing date: 2023-05-04
Publication date: 2023-09-22
Anticipated expiration: 2043-05-04
Also published as: CN116231189A

Abstract

The embodiment of the application provides a box body, a battery and electric equipment. The box includes lateral wall and lid, and the lateral wall encloses to close and forms and is used for holding the free chamber that holds of battery, and the opening in chamber is held in the one end formation of lateral wall. The lid is used for covering the opening, and the lid includes body and bulge, and the body has the first surface towards the lateral wall, and the bulge is protruding to locate first surface, and the bulge is used for stretching into and holds the chamber and connect in the lateral wall. According to the technical scheme provided by the embodiment of the application, the energy density of the battery can be improved.

Description

Box, battery and electric equipment

Technical Field

The application relates to the technical field of batteries, in particular to a box, a battery and electric equipment.

Background

Energy conservation and emission reduction are key to sustainable development of the automobile industry, and electric vehicles become an important component of sustainable development of the automobile industry due to the energy conservation and environmental protection advantages of the electric vehicles. For electric vehicles, battery technology is an important factor in the development of the electric vehicles.

The energy density of a battery is a non-negligible problem in the manufacturing process of the battery. Therefore, how to increase the energy density of the battery is a technical problem to be solved in the battery technology.

Disclosure of Invention

The application provides a box body, a battery and electric equipment, which can improve the energy density of the battery.

The application is realized by the following technical scheme:

in a first aspect, embodiments of the present application provide a case for a battery, the case including a sidewall and a cover. The side wall encloses and closes and forms the chamber that holds that is used for holding battery monomer, and the opening in chamber is held in one end formation of side wall. The lid is used for covering the opening, and the lid includes body and bulge, and the body has the first surface towards the lateral wall, and the bulge is protruding to locate first surface, and the bulge is used for stretching into and holds the chamber and connect in the lateral wall.

According to the battery provided by the embodiment of the application, the protruding part is arranged on the cover body, and the side wall can be provided with a protruding structure which occupies space, so that on one hand, the battery monomer group can conveniently enter the accommodating cavity; on the other hand, after the battery monomer group enters the accommodating cavity, the distance between the battery monomer group and the side wall can be smaller, so that the space utilization rate inside the box body is higher, and the battery has higher energy density.

According to some embodiments of the application, the side wall comprises two first side walls oppositely arranged along the first direction, two protruding parts are arranged, the two protruding parts are in one-to-one correspondence with the two first side walls, and each protruding part is connected with the corresponding first side wall.

In the above embodiment, the two protruding portions are in one-to-one correspondence with the two first side walls, and each protruding portion is connected with one first side wall, so that connection between the protruding portion and the side wall is realized at two opposite positions, and connection stability of the cover body and the side wall is improved.

According to some embodiments of the application, the body does not extend beyond the outer surface of the first sidewall in the first direction.

In the above embodiment, the body does not exceed the outer surface of the first side wall, so that the body occupies a smaller space in the first direction, and the space occupation of the battery in the first direction is reduced.

According to some embodiments of the application, the case further comprises a first fastener by which the first sidewall is connected to the projection.

In the above embodiment, the first side wall is connected to the protruding portion by the first fastener, and it may be that the first fastener connects the first side wall and the protruding portion in the first direction, so that assembly is facilitated.

According to some embodiments of the application, the first sidewall is provided with a first through hole, the projection is provided with a first threaded hole, and the first fastener passes through the first through hole and is connected to the first threaded hole.

In the above embodiment, the first fastener passes through the first through hole and is connected to the first threaded hole, so that the assembly and the disassembly are facilitated.

According to some embodiments of the application, the case further comprises two second side walls disposed opposite each other along a second direction, the first direction intersecting the second direction.

In the above embodiment, the two second side walls are oppositely disposed along the second direction, and the second side walls are connected with the first side walls to form a space for accommodating the battery cell group, so as to accommodate the battery cell group conveniently.

According to some embodiments of the application, the case further comprises a second fastener by which the second sidewall is connected to the body.

In the above embodiment, the second side wall is connected with the body by the second fastener, so that the assembly is facilitated.

According to some embodiments of the application, the second sidewall has a second end face facing the body, the second end face being provided with a second threaded hole, the body being provided with a second through hole, and the second fastener passing through the second through hole and being connected to the second threaded hole.

In the above embodiment, the second threaded hole corresponds to the second through hole, and the second fastener passes through the second through hole and is connected with the second threaded hole, so that the second side wall and the body are firmly connected, and the assembly and the disassembly are convenient.

According to some embodiments of the application, the case further comprises a first seal disposed between the first sidewall and the cover, and a second seal disposed between the second sidewall and the cover.

In the above embodiment, the first sealing member forms a seal between the first side wall and the cover body, and the second sealing member forms a seal between the second side wall and the cover body, so that a better sealing effect is provided between the side wall and the cover body.

According to some embodiments of the application, the first seal includes a first portion and a second portion connected to each other, the first portion being located between an inner surface of the first sidewall and the projection, the first sidewall having a first end face facing the body, the second portion being located between the first end face and the body.

In the above embodiment, the first portion is used to seal between the inner surface of the first sidewall and the protrusion, and the second portion is used to seal between the first end surface and the body, so that the cover and the sidewall have a better sealing effect.

According to some embodiments of the application, the second seal comprises a third portion and a fourth portion connected to each other, the third portion being located on an inner surface of the second sidewall, the second sidewall having a second end face facing the body, the fourth portion being located between the second end face and the body.

In the above embodiment, the third portion is connected to the fourth portion and located on the inner surface of the second side wall, so as to facilitate assembly of the second seal member with the second side wall, and the fourth portion is used to achieve sealing between the second end surface and the body.

According to some embodiments of the application, the protrusion extends in a second direction, an end of the protrusion in the second direction abutting the third portion.

In the above embodiment, the end of the protruding portion in the second direction abuts against the third portion, so that the protruding portion may have a larger size in the second direction so that the protruding portion has a larger sealing area with the first side wall, and the end of the protruding portion abuts against the third portion so that the second seal is fitted with the second side wall.

According to some embodiments of the application, the first seal and the second seal are integrally formed.

In the embodiment, the first sealing element and the second sealing element are integrally formed, so that the processing and the manufacturing are convenient, and a good sealing effect is achieved between the cover body and the side wall.

According to some embodiments of the application, the end of the projection remote from the body is formed with a guide surface.

In the above embodiment, the protruding portion is provided with the guide surface to guide the protruding portion into the accommodating cavity, so that the assembly of the cover body and the side wall is facilitated.

In a second aspect, an embodiment of the present application further provides a battery, including a battery unit group and a case provided in the foregoing embodiment, where the battery unit group is accommodated in an accommodating cavity of the case.

According to the battery provided by the embodiment of the application, the battery monomer group is accommodated in the accommodating cavity, so that the distance between the battery monomer group and the side wall can be smaller, the space utilization rate in the box body is improved, and the battery has higher energy density.

According to some embodiments of the application, the projection of the protrusion overlaps the projection of the battery cell group along a third direction, and the third direction, the first direction and the second direction are perpendicular to each other.

In the above embodiment, the projection of the protruding portion partially overlaps with the projection of the battery unit group, so that the distance between the battery unit group and the side wall of the box is smaller, more battery unit groups are convenient to set, and the battery can have higher energy density.

According to some embodiments of the application, the case further comprises a bottom wall, the side wall is surrounded around the bottom wall, the other end of the side wall is connected with the bottom wall, and the battery cell group is arranged on the bottom wall.

In the above embodiment, the bottom wall may carry the battery cell group, so as to facilitate positioning of the battery cell group.

According to some embodiments of the application, the battery cell group comprises a plurality of battery cells, an electrode terminal is arranged on one side of the battery cells, which is away from the bottom wall, and the projection of the projection part is overlapped with the projection part of the electrode terminal along the first direction.

In the above embodiment, the side of the battery cell facing away from the bottom wall is provided with the electrode terminal, that is, the electrode terminal is provided on the side of the battery cell close to the cover body; the projection of the protruding part along the first direction is overlapped with the projection part of the electrode terminal along the first direction, and the space utilization rate of the battery monomer group in the height direction of the box body is higher, so that the battery has higher energy density.

In a third aspect, an embodiment of the present application further provides an electric device, including the battery provided in any one of the embodiments.

The foregoing description is only an overview of the present application, and is intended to be implemented in accordance with the teachings of the present application in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present application more readily apparent.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the present application;

fig. 2 is an exploded view of a battery provided in some embodiments of the present application;

fig. 3 is a front view of a battery provided in some embodiments of the application;

FIG. 4 is a cross-sectional view of the cell of FIG. 3 taken in the direction A-A;

fig. 5 is a schematic structural diagram of a cover according to some embodiments of the present application;

FIG. 6 is an enlarged view of a portion of FIG. 4 at B;

fig. 7 is an exploded view of a battery according to other embodiments of the present application;

FIG. 8 is an enlarged view of a portion of FIG. 2 at C;

fig. 9 is a cross-sectional view of a battery provided in some embodiments of the application;

FIG. 10 is a partial enlarged view at D of FIG. 9;

FIG. 11 is a top view of the battery shown in FIG. 3;

fig. 12 is a flow chart illustrating a method for manufacturing a battery according to some embodiments of the present application.

Icon: 100-cell; 11-a box body; 110-a receiving cavity; 111-sidewalls; 111 A-A first sidewall; 111 b-a second sidewall; 111 c-a first through hole; 111 d-a first end face; 111 e-a second end face; 111 f-a second threaded hole; 112-a bottom wall; 113-opening; 114-a main body portion; 115-flange; 116-a fifth through hole; 12-a cover; 121-a body; 121 A-A second through hole; 122-a protrusion; 122 A-A first threaded hole; 122 b-guide surface; 123-a first surface; 20-battery cell group; 21-battery cell; 211-electrode terminals; 31-a first seal; 311-first part; 312-a second portion; 313-a third via; 32-a second seal; 321-a third portion; 322-fourth section; 323-fourth through hole; 41-a first fastener; 42-a second fastener; 200-a controller; 300-motor; 1000-vehicle.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "comprising" and "having" and any variations thereof in the description of the application and the claims and the description of the drawings above are intended to cover a non-exclusive inclusion. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the described embodiments of the application may be combined with other embodiments.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

The term "and/or" in the present application is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.

The term "plurality" as used herein means two or more (including two), and similarly, "plural sets" means two or more (including two), and "plural sheets" means two or more (including two).

In some embodiments, the battery may be a battery module, and when there are a plurality of battery cells, the plurality of battery cells are arranged and fixed to form one battery module.

In some embodiments, the battery may be a battery pack including a housing structure including a case and a cover covering an opening of the case, and a battery cell or a battery module accommodated in the case.

In some embodiments, the receiving structure may be part of a chassis structure of a vehicle. For example, a portion of the receiving structure may become at least a portion of a floor of the vehicle, or a portion of the receiving structure may become at least a portion of a cross member and a longitudinal member of the vehicle.

In some embodiments, the battery may be an energy storage device. The energy storage device comprises an energy storage container, an energy storage electric cabinet and the like.

In the embodiment of the application, the battery cell can be a secondary battery, and the secondary battery refers to a battery cell which can activate the active material in a charging mode to continue to use after the battery cell discharges.

The battery cell may be, but is not limited to, a lithium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, and the like.

The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge of the battery cell, active ions (e.g., lithium ions) are inserted and extracted back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, can play a role in preventing the positive electrode and the negative electrode from being short-circuited, and can enable active ions to pass through.

In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

As an example, the positive electrode current collector has two surfaces opposing in its own thickness direction, and the positive electrode active material is provided on either or both of the two surfaces opposing the positive electrode current collector.

As an example, the positive electrode current collector may employ a metal foil or a composite current collector. For example, as the metal foil, surface-silver-treated aluminum, surface-silver-treated stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, titanium, or the like can be used. The composite current collector may include a polymeric material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel alloy, titanium alloy, silver alloy, etc.) on a polymer material substrate (e.g., a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material may be used.

In some embodiments, the negative electrode may be a negative electrode tab, which may include a negative electrode current collector.

As an example, the negative electrode current collector may employ a metal foil or a composite current collector. For example, as the metal foil, surface-silver-treated aluminum, surface-silver-treated stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, titanium, or the like can be used.

In some embodiments, the anode current collector has two surfaces opposing in a thickness direction thereof, and the anode active material is provided on either or both of the two surfaces opposing the anode current collector.

As an example, a negative electrode active material for a battery known in the art may be used. As an example, the anode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, and the like. The silicon-based material may be at least one selected from elemental silicon, silicon oxygen compounds, silicon carbon composites, silicon nitrogen composites, and silicon alloys. The tin-based material may be at least one selected from elemental tin, tin oxide, and tin alloys. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery anode active material may be used. These negative electrode active materials may be used alone or in combination of two or more.

In some embodiments, the separator is a separator film. The type of the separator is not particularly limited, and any known porous separator having good chemical stability and mechanical stability can be used.

As an example, the main material of the separator may be at least one selected from glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator may be a single-layer film or a multilayer composite film, and is not particularly limited. When the separator is a multilayer composite film, the materials of the respective layers may be the same or different, and are not particularly limited. The separator may be a single member located between the positive and negative electrodes, or may be attached to the surfaces of the positive and negative electrodes.

In some embodiments, the separator is a solid state electrolyte. The solid electrolyte is arranged between the anode and the cathode and plays roles in transmitting ions and isolating the anode and the cathode.

In some embodiments, the electrode assembly is a rolled structure. The positive plate and the negative plate are wound into a winding structure.

In some embodiments, the electrode assembly is a lamination stack.

In some embodiments, the battery cell may include a housing. The case is used to encapsulate the electrode assembly, the electrolyte, and the like. The shell can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), an aluminum-plastic film or the like.

In some embodiments, the case includes an end cap and a case, the case is provided with an opening, and the end cap closes the opening to form a closed space for accommodating the electrode assembly, electrolyte, and the like. The housing may be provided with one or more openings. One or more end caps may also be provided.

In some embodiments, at least one electrode terminal is provided on the case, and the electrode terminal is electrically connected with the tab of the electrode assembly. The electrode terminal may be directly connected to the tab, or may be indirectly connected to the tab through the adapter. The electrode terminal may be provided on the terminal cover or may be provided on the case.

In some embodiments, an explosion proof valve is provided on the housing. The explosion-proof valve is used for discharging the internal pressure of the battery cell.

As examples, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or other shaped battery cell, including a square-case battery cell, a blade-shaped battery cell, a polygonal-prismatic battery cell, such as a hexagonal-prismatic battery cell, or the like.

The development of battery technology is to consider various design factors, such as discharge capacity, charge-discharge rate, and other performance parameters, and also to consider the energy density of the battery.

The battery includes box and battery monomer group, and the box includes lateral wall and lid, and the lateral wall encloses into the chamber that holds that is used for holding battery monomer, and the opening in chamber is held in the one end formation of lateral wall, the opening of lid cover lateral wall. In the battery manufacturing process, the space utilization inside the case affects the energy density of the battery. In order to improve the connection tightness of the side wall and the cover body, the side wall is generally provided with a sealing structure, however, the sealing structure protrudes out of the inner surface of the side wall, so that the battery unit group needs to avoid the sealing structure when entering the accommodating cavity, a larger gap is formed between the battery unit group and the side wall, the space utilization rate in the box body is lower, and the energy density of the battery is lower.

In view of this, in order to solve the problem that the lower energy density of the battery is caused by lower space utilization rate in the box body, the application provides a technical scheme that the protruding part is arranged on the cover body, so that the distance between the battery monomer group and the side wall can be smaller, the space utilization rate in the box body is improved, and the battery has higher energy density.

In such battery, the internal surface of lateral wall does not set up convex structure, and on the one hand, the battery monomer of being convenient for gets into inside the box, and on the other hand, the battery monomer group is inside the back of getting into the box, and interval between battery monomer group and the lateral wall can be less for battery monomer group occupies great space in holding the intracavity, and the space utilization of box inside is higher, and then makes the battery can have higher energy density.

The battery disclosed by the embodiment of the application can be used in electric equipment such as vehicles, ships or aircrafts, but is not limited to the electric equipment. The power supply system of the electric equipment can be composed by using the battery provided with the battery disclosed by the application.

The embodiment of the application provides electric equipment using a battery as a power supply, wherein the electric equipment can be, but is not limited to, a mobile phone, a tablet personal computer, a notebook computer, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, an electric automobile, a ship, a spacecraft and the like. Among them, the electric toy may include fixed or mobile electric toys, such as game machines, electric car toys, electric ship toys, electric plane toys, and the like, and the spacecraft may include planes, rockets, space planes, and spacecraft, and the like.

For convenience of description, the following embodiments take a powered device according to an embodiment of the present application as an example of the vehicle 1000.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle according to some embodiments of the application. The vehicle 1000 may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle. The battery 100 is provided in the interior of the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. Battery 100 may be used to power vehicle 1000, for example, battery 100 may be used as an operating power source for vehicle 1000, for the circuitry of vehicle 1000, such as for the operational power requirements of vehicle 1000 during start-up, navigation, and operation.

The vehicle 1000 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.

In some embodiments of the present application, battery 100 may not only serve as an operating power source for vehicle 1000, but may also serve as a driving power source for vehicle 1000, instead of or in part instead of fuel oil or natural gas, to provide driving power for vehicle 1000.

Referring to fig. 2 to 6, fig. 2 is an exploded view of a battery according to some embodiments of the present application, fig. 3 is a front view of a battery according to some embodiments of the present application, fig. 4 is a cross-sectional view of the battery shown in fig. 3 in A-A direction, fig. 5 is a schematic structural view of a cover according to some embodiments of the present application, and fig. 6 is a partially enlarged view at B of fig. 4.

The embodiment of the application provides a battery 100, and the battery 100 comprises a battery unit group 20 and a box 11. The battery cell group 20 is accommodated in the case 11.

The battery unit group 20 may include a plurality of battery units 21, and the plurality of battery units 21 may be connected in series, parallel, or a series-parallel connection, where a series-parallel connection refers to that the plurality of battery units 21 are connected in both series and parallel. The plurality of battery cells 21 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 21 is accommodated in the box 11; of course, the battery 100 may also be a battery module formed by connecting a plurality of battery cells 21 in series or parallel or series-parallel connection, and a plurality of battery modules are then connected in series or parallel or series-parallel connection to form a whole and are accommodated in the case 11. The battery 100 may further include other structures, for example, the battery 100 may further include a bus member for making electrical connection between the plurality of battery cells 21.

Wherein, the battery cell 21 may be a secondary battery or a primary battery; the battery cell 21 may also be a lithium sulfur battery, a sodium ion battery, or a magnesium ion battery, but is not limited thereto.

Referring to fig. 2 to 6, according to some embodiments of the present application, a case 11 is provided. The case 11 includes a side wall 111 and a cover 12. The side wall 111 encloses a receiving chamber 110 for receiving the battery cell 21, and one end of the side wall 111 forms an opening 113 of the receiving chamber 110. The cover 12 is used for covering the opening 113, the cover 12 includes a body 121 and a protrusion 122, the body 121 has a first surface 123 facing the sidewall 111, the protrusion 122 is protruding from the first surface 123, and the protrusion 122 is used for extending into the accommodating cavity 110 and connecting to the sidewall 111.

In some embodiments, the case 11 may further include a bottom wall 112, the bottom wall 112 and the opening 113 are located at opposite ends of the side wall 111, and the side wall 111 is connected to the bottom wall 112 to form a hollow structure with one end open 113 so as to form a space for accommodating the battery cell group 20 in cooperation with the cover 12. In other embodiments, the opposite ends of the sidewall 111 may be provided with openings 113, and both openings 113 may be covered by the cover 12, respectively.

When the case 11 further includes the bottom wall 112, the bottom wall 112 and the opening 113 may be located at opposite ends of the side wall 111 in the thickness direction of the body 121. In the drawing, the direction indicated by the letter Z may be parallel to the thickness direction of the body 121.

The side walls 111 enclose a hollow structure, i.e., the side walls 111 enclose a receiving chamber 110 for receiving the battery cells 21.

The opening 113 may be located at one end of the sidewall 111 in the thickness direction (Z direction) of the body 121.

The body 121 may have a plate-like structure, and the body 121 covers the opening 113 to close the opening 113.

The first surface 123 may be a surface of the body 121 facing the sidewall 111. The protrusion 122 is protruded on the first surface 123, that is, the protrusion 122 is protruded on a side of the body 121 facing the sidewall 111, at least a portion of the protrusion 122 can extend into the interior of the accommodating cavity 110, so that the protrusion 122 is located inside the sidewall 111, and connection of the protrusion 122 with the sidewall 111 is facilitated.

The protruding portion 122 can increase the connection area between the cover 12 and the side wall 111, so that the cover 12 and the side wall 111 can be assembled conveniently. The side wall 111 can be in sealing fit with the protruding portion 122, and the side wall 111 is combined with the body 121 in sealing fit, so that a good sealing effect is achieved between the side wall 111 and the cover 12.

According to the battery of the embodiment of the present application, the protruding portion 122 is disposed on the cover 12, and the side wall 111 may not have a protruding structure that occupies a space, so that, on one hand, the battery cell group 20 can enter the interior of the accommodating cavity 110; on the other hand, after the battery cell stack 20 enters the accommodating chamber 110, the distance between the battery cell stack 20 and the side wall 111 may be made smaller, so that the space utilization inside the case 11 is higher, thereby making the battery 100 have a higher energy density.

Referring to fig. 2, 4 and 5, according to some embodiments of the present application, the side wall 111 includes two first side walls 111a disposed opposite to each other along the first direction X, two protruding portions 122 are disposed, two protruding portions 122 are in one-to-one correspondence with the two first side walls 111a, and each protruding portion 122 is connected with the corresponding first side wall 111 a.

In the figure, the direction indicated by the letter X may be the first direction.

The two first sidewalls 111a are disposed opposite to each other along the first direction X, and the battery cell group 20 is disposed between the two first sidewalls 111 a.

The two protruding portions 122 are in one-to-one correspondence with the two first side walls 111a, and each protruding portion 122 is connected with one first side wall 111a, so that connection between the protruding portion 122 and the side wall 111 is achieved at two opposite positions, and connection stability between the cover 12 and the side wall 111 is improved.

Referring to fig. 4 and 6, according to some embodiments of the application, the body 121 does not extend beyond the outer surface of the first sidewall 111a along the first direction X.

The outer surface of the first sidewall 111a refers to the surface of the first sidewall 111a facing away from the battery cell group 20, and accordingly, the surface of the first sidewall 111a facing the battery cell group 20 is the inner surface of the first sidewall 111 a.

The body 121 does not exceed the outer surface of the first sidewall 111a along the first direction X, so that the body 121 occupies less space in the first direction X, and the space occupation of the battery 100 in the first direction X is reduced.

In some embodiments, the body 121 may be connected with the first sidewall 111a, e.g., the body 121 may overlap with the first sidewall 111a. The first sidewall 111a may have a first end surface 111d facing the body 121, and the body 121 may be connected to the first end surface 111d.

Referring to fig. 6, according to some embodiments of the present application, the case 11 further includes a first fastening member 41, and the first sidewall 111a is connected to the protrusion 122 by the first fastening member 41.

The first fastener 41 is a member for achieving connection of the first sidewall 111a with the projection 122, and the first fastener 41 may be a pin, a bolt, or the like.

The first sidewall 111a is connected to the protrusion 122 by the first fastener 41, and it may be that the first fastener 41 connects the first sidewall 111a and the protrusion 122 in the first direction X, so that assembly is facilitated.

Referring to fig. 6, according to some embodiments of the present application, the first sidewall 111a is provided with a first through hole 111c, the protrusion 122 is provided with a first threaded hole 122a, and the first fastener 41 passes through the first through hole 111c and is connected to the first threaded hole 122a.

The first through hole 111c is a hole provided in the first sidewall 111a, so that the first fastener 41 is penetrated. The first through hole 111c may penetrate the first sidewall 111a in the thickness direction of the first sidewall 111a, for example, the first through hole 111c may penetrate the first sidewall 111a in the first direction X.

The first screw hole 122a is a hole provided in the protruding portion 122 for connection with the first fastener 41. The first fastener 41 is provided with threads corresponding to the first threaded hole 122a so that the first fastener 41 is screwed with the protruding portion 122.

The first screw hole 122a may be disposed coaxially with the first through hole 111 c.

The first fastener 41 passes through the first through hole 111c and is coupled to the first screw hole 122a, facilitating assembly and disassembly.

The first screw hole 122a may be a screw hole provided in the protruding portion 122, or may be a screw hole of a screw sleeve provided in the protruding portion 122.

Referring to fig. 2 and 3, according to some embodiments of the present application, the case 11 further includes two second sidewalls 111b disposed opposite to each other along the second direction Y, and the first direction X intersects with the second direction Y.

In the figure, the direction indicated by the letter Y may be the second direction.

The two second side walls 111b are disposed opposite to each other along the second direction Y, and the battery cell group 20 is disposed between the two second side walls 111 b.

Both ends of the second side walls 111b in the first direction X may be connected to the first side walls 111a, respectively, such that two second side walls 111b and two first side walls 111a enclose a space for accommodating the battery cell group 20.

The first direction X intersects the second direction Y, and the first side wall 111a and the second side wall 111b are connected, and an angle between the first side wall 111a and the second side wall 111b may be 80 ° to 100 °, so that a space enclosed by the first side wall 111a and the second side wall 111b can accommodate more battery cell groups 20.

In some embodiments, the first direction X may be perpendicular to the second direction Y such that the sidewall 111 has a hollow square structure.

In the above embodiment, the two second side walls 111b are disposed opposite to each other along the second direction Y, and the second side walls 111b and the first side walls 111a are connected to enclose a space for accommodating the battery cell group 20, so as to accommodate the battery cell group 20.

Referring to fig. 2 and 6, according to some embodiments of the present application, the case 11 further includes a second fastening member 42, and the second sidewall 111b is connected to the body 121 by the second fastening member 42.

The second fastener 42 may be a member for connecting the second sidewall 111b with the body 121. The second fastener 42 may be a pin, bolt, or the like.

The connection of the second side wall 111b to the body 121 is achieved by the second fastener 42, facilitating assembly.

Referring to fig. 2, 5 and 6, according to some embodiments of the present application, the second sidewall 111b has a second end surface 111e facing the body 121, the second end surface 111e is provided with a second threaded hole 111f, the body 121 is provided with a second through hole 121a, and the second fastener 42 passes through the second through hole 121a and is connected to the second threaded hole 111f.

The second end surface 111e is a surface of the second side wall 111b facing the body 121, the second end surface 111e is disposed near the body 121, and the second end surface 111e is away from the bottom wall 112. The body 121 may be connected to the second end face 111e, for example, the first surface 123 of the body 121 may be bonded to the second end face 111e, or the first surface 123 of the body 121 may be connected to the second end face 111e by other connectors, for example, the body 121 is connected to the second end face 111e by a seal.

The second threaded hole 111f is a hole disposed on the second end surface 111e, and the extending direction of the second threaded hole 111f may be perpendicular to the second end surface 111e. The second fastener 42 is provided with threads corresponding to the second threaded hole 111f to facilitate the threaded connection of the second fastener 42 with the second sidewall 111 b.

The second through hole 121a is a hole disposed on the body 121, and the second through hole 121a may be disposed coaxially with the second threaded hole 111f, so as to facilitate the second fastener 42 to pass through.

Alternatively, the second through hole 121a may penetrate the body 121 in the thickness direction (Z direction) of the body 121.

The second threaded hole 111f corresponds to the second through hole 121a, and the second fastener 42 passes through the second through hole 121a and is connected with the second threaded hole 111f, so that the second side wall 111b is firmly connected with the body 121, and is convenient to assemble and disassemble.

Referring to fig. 7, fig. 7 is an exploded view of a battery according to other embodiments of the present application. In some embodiments, the second side wall 111b includes a main body 114 and a flange 115, the flange 115 is located at an end of the main body 114 away from the bottom wall 112 and protrudes from an outer surface of the main body 114, the main body 121 is provided with a second through hole 121a, the flange 115 has a second end surface 111e facing the main body 121, the second end surface 111e is provided with a fifth through hole 116, and the second fastener 42 is disposed through the second through hole 121a and the fifth through hole 116.

The outer surface of the main body 114 refers to the surface of the main body 114 facing away from the battery cell stack 20.

The second fastener 42 may be a threaded member, and the second fastener 42 is coupled to the nut after passing through the second through hole 121a and the fifth through hole to lock the body 121 to the second sidewall 111b.

The flange 115 is disposed such that the second side wall 111b has a larger contact area with the body 121, so as to facilitate connection between the body 121 and the second side wall 111b.

Referring to fig. 2 and 6, and further referring to fig. 8, fig. 8 is a partial enlarged view of fig. 2 at C. According to some embodiments of the present application, the case 11 further includes a first seal 31 and a second seal 32, the first seal 31 being disposed between the first sidewall 111a and the cover 12, the second seal 32 being disposed between the second sidewall 111b and the cover 12.

The first seal 31 is a member for sealing the first side wall 111a and the cover 12. The first sealing member 31 may be an elastic member, and the first side wall 111a and the cover 12 may be sealed by elastic deformation of the first sealing member 31.

The second seal 32 is a member for sealing the second side wall 111b with the cover 12. The second sealing member 32 may be an elastic member, and the second side wall 111b and the cover 12 form a seal by elastic deformation of the second sealing member 32.

In the above embodiment, the first seal member 31 forms a seal between the first side wall 111a and the cover 12, and the second seal member 32 forms a seal between the second side wall 111b and the cover 12, so that a good sealing effect is provided between the side wall 111 and the cover 12.

Referring to fig. 6, according to some embodiments of the present application, the first sealing member 31 includes a first portion 311 and a second portion 312 connected to each other, the first portion 311 is located between an inner surface of the first sidewall 111a and the protrusion 122, the first sidewall 111a has a first end surface 111d facing the body 121, and the second portion 312 is located between the first end surface 111d and the body 121.

The first portion 311 and the second portion 312 are integral parts of the first seal 31. The first portion 311 and the second portion 312 can be integrally formed, which is convenient for processing and manufacturing; alternatively, the first portion 311 and the second portion 312 may be provided separately and integrally connected.

The first portion 311 is located between the inner surface of the first sidewall 111a and the protrusion 122, and the first portion 311 may be interposed between the inner surface of the first sidewall 111a and the protrusion 122, that is, the inner surface of the first sidewall 111a and the protrusion 122 may respectively abut against the first portion 311 such that the first portion 311 forms a seal between the inner surface of the first sidewall 111a and the protrusion 122.

The first end surface 111d is a surface of the first side wall 111a facing the body 121, the first end surface 111d is close to the body 121, and the first end surface 111d is far from the bottom wall 112.

The second portion 312 is located between the first end face 111d and the body 121, and the second portion 312 may be interposed between the first end face 111d and the body 121, i.e., the first end face 111d and the body 121 may abut against the second portion 312, respectively, such that the second portion 312 forms a seal between the first end face 111d and the body 121.

In the above embodiment, the first portion 311 is used to achieve the seal between the inner surface of the first sidewall 111a and the protrusion 122, and the second portion 312 is used to achieve the seal between the first end surface 111d and the body 121, so that the cover 12 has a better sealing effect with the sidewall 111.

Referring to fig. 6, in some embodiments, the first sidewall 111a is provided with a first through hole 111c, the protrusion 122 is provided with a first threaded hole 122a, the first portion 311 is provided with a third through hole 313, and the first fastener 41 passes through the first through hole 111c and the third through hole 313 and is connected to the first threaded hole 122a.

The first fastener 41 connects the protrusion 122 with the first sidewall 111a through the first portion 311, so that a better sealing effect is provided between the protrusion 122 and the first sidewall 111 a.

In some embodiments, two first seals 31 may be provided, the two first seals 31 being disposed opposite to each other in the first direction X, each first seal 31 corresponding to one first sidewall 111a, and each protrusion 122 sandwiching one first seal 31 with the corresponding first sidewall 111 a.

Referring to fig. 8, and further to fig. 9 and 10, fig. 9 is a cross-sectional view of a battery according to some embodiments of the present application, and fig. 10 is a partial enlarged view of fig. 9 at D. According to some embodiments of the application, the second seal 32 comprises a third portion 321 and a fourth portion 322 connected to each other, the third portion 321 being located at an inner surface of the second side wall 111b, the second side wall 111b having a second end face 111e facing the body 121, the fourth portion 322 being located between the second end face 111e and the body 121.

The inner surface of the second side wall 111b refers to the surface of the second side wall 111b facing the battery cell group 20, and correspondingly, the surface of the second side wall 111b facing away from the battery cell group 20 is the outer surface of the second side wall 111 b.

The third portion 321 and the fourth portion 322 are integral parts of the second seal 32. The third portion 321 and the fourth portion 322 can be integrally formed, so that the processing and the manufacturing are facilitated; alternatively, the third portion 321 and the fourth portion 322 may be provided separately and integrally connected.

The third portion 321 is located on the inner surface of the second side wall 111b, i.e., the third portion 321 is located inside the second side wall 111 b. The inner side of the second side wall 111b and the inner side of the first side wall 111a enclose a space for accommodating the battery cell group 20. The third portion 321 may be adhered to the inner surface of the second sidewall 111 b.

The fourth portion 322 is located between the second end face 111e and the body 121, and the fourth portion 322 may be interposed between the second end face 111e and the body 121, that is, the second end face 111e and the body 121 may abut against the fourth portion 322, respectively, such that the fourth portion 322 forms a seal between the second end face 111e and the body 121.

In the above embodiment, the third portion 321 is connected to the fourth portion 322 and located on the inner surface of the second side wall 111b, so as to facilitate the assembly of the second seal 32 with the second side wall 111b, and the fourth portion 322 is used to achieve the seal between the second end face 111e and the body 121.

Referring to fig. 2, 5 and 8, in some embodiments, the second end surface 111e is provided with a second threaded hole 111f, the body 121 is provided with a second through hole 121a, the fourth portion 322 is provided with a fourth through hole 323, and the second fastener 42 passes through the second through hole 121a and the fourth through hole 323 and is connected to the second threaded hole 111f.

The second fastener 42 connects the body 121 with the second sidewall 111b through the fourth portion 322, so that a better sealing effect is provided between the body 121 and the second sidewall 111 b.

Referring to fig. 5, 9 and 10, according to some embodiments of the application, the protrusion 122 extends along the second direction Y, and an end of the protrusion 122 along the second direction Y abuts against the third portion 321.

The protrusion 122 extends along the second direction Y, the protrusion 122 may have a rectangular parallelepiped shape, and a length direction of the protrusion 122 may be parallel to the second direction Y.

In some embodiments, the second seals 32 may be provided in two, two second seals 32 being disposed opposite in the second direction Y, each second seal 32 corresponding to one second sidewall 111 b. Both ends of the protrusion 122 in the second direction Y may respectively abut against the third portions 321 of the two second seals 32.

In the above-described embodiment, the end of the projection 122 in the second direction Y abuts against the third portion 321, so that the projection 122 may have a larger size in the second direction Y so that the projection 122 has a larger sealing area with the first side wall 111a, and the end of the projection 122 abuts against the third portion 321 so that the second seal 32 is engaged with the second side wall 111 b.

According to some embodiments of the application, the first seal 31 and the second seal 32 are integrally formed.

The first seal 31 and the second seal 32 may each be a rubber member.

In the above embodiment, the first sealing member 31 and the second sealing member 32 are integrally formed, which is convenient for manufacturing, and has a good sealing effect between the cover 12 and the side wall 111.

In an embodiment in which the first side wall 111a is connected to the protrusion 122 by the first fastener 41 and the second side wall 111b is connected to the body 121 by the second fastener 42, the first portion 311 is located between the inner surface of the first side wall 111a and the protrusion 122, the first side wall 111a is provided with the first through hole 111c, the protrusion 122 is provided with the first screw hole 122a, the first portion 311 is provided with the third through hole 313, and the first fastener 41 passes through the first through hole 111c and the third through hole 313 and is connected to the first screw hole 122a; the second portion 312 is located between the first end face 111d and the body 121. The third portion 321 is located on the inner surface of the second side wall 111b, the fourth portion 322 is located between the second end surface 111e and the body 121, the second end surface 111e is provided with a second threaded hole 111f, the body 121 is provided with a second through hole 121a, the fourth portion 322 is provided with a fourth through hole 323, and the second fastener 42 passes through the second through hole 121a and the fourth through hole 323 and is connected to the second threaded hole 111f.

Referring to fig. 6, in some embodiments, the first fastening member 41 is disposed along the first direction X, and the first fastening member 41 passes through the first through hole 111c and the third through hole 313 and is connected to the first threaded hole 122a. Referring to fig. 2, 8 and 10, the second fastening member 42 is disposed along the thickness direction (Z direction) of the body 121, and the second fastening member 42 passes through the second through hole 121a and the fourth through hole 323 and is connected to the second threaded hole 111f. The first and second fasteners 41 and 42 apply fastening forces from the first direction X and the thickness direction (Z direction) of the body 121, respectively, so that the first and second seals 31 and 32 form a good sealing effect between the side wall 111 and the cover 12.

Referring to fig. 4 and 6, according to some embodiments of the application, a guiding surface 122b is formed at an end of the protruding portion 122 away from the body 121.

The distance between the guide surfaces 122b of the two protrusions 122 gradually decreases from one end closer to the body 121 to one end farther from the body 121 in the thickness direction (Z direction) of the body 121.

In the above embodiment, the protruding portion 122 is provided with the guide surface 122b to guide the protruding portion 122 into the accommodating chamber 110, so that the assembly of the cover 12 and the side wall 111 is facilitated.

Referring to fig. 2 and 4, according to some embodiments of the present application, a battery 100 is provided, where the battery 100 includes a battery cell set 20 and a case 11 provided in any of the above embodiments, and the battery cell set 20 is accommodated in an accommodating cavity 110 of the case 11.

The battery cell group 20 includes a plurality of battery cells 21, the plurality of battery cells 21 are accommodated in the accommodating cavity, and the side wall 111 and the cover 12 form protection for the battery cell group 20.

According to the battery 100 of the embodiment of the application, the battery cell group 20 is accommodated in the accommodating cavity 110, so that the distance between the battery cell group 20 and the side wall 111 can be smaller, the space utilization rate inside the case 11 is improved, and the battery 100 has higher energy density.

Referring to fig. 4 and 6, and further referring to fig. 11, fig. 11 is a top view of the battery shown in fig. 3, and fig. 11 is a schematic diagram of a projection of the protrusion 122 and a projection of the battery cell group 20, which are obtained by observing the battery 100 shown in fig. 3 along the third direction Z. According to some embodiments of the present application, along the third direction Z, the projection of the protrusion 122 overlaps the projection of the battery cell group 20, and the third direction Z, the first direction X, and the second direction Y are perpendicular to each other.

In the figure, the direction indicated by the letter Z may be a third direction. The opening 113 and the bottom wall 112 may be located at opposite ends of the side wall 111 in the third direction Z. The third direction Z may be parallel to the thickness direction of the body 121, that is, the projection of the protrusion 122 overlaps with the projection portion of the battery cell group 20 in the thickness direction of the body 121.

In the above embodiment, the projection of the protruding portion 122 along the third direction Z overlaps with the projection of the battery cell group 20 along the third direction Z, so that the distance between the battery cell group 20 and the side wall 111 of the case 11 is smaller, so that more battery cell groups 20 are convenient to be disposed, and the battery 100 can have a higher energy density.

Referring to fig. 2 and 4, according to some embodiments of the present application, the case 11 further includes a bottom wall 112, a side wall 111 is disposed around the bottom wall 112, the other end of the side wall 111 is connected to the bottom wall 112, and the battery cell set 20 is disposed on the bottom wall 112.

In some embodiments, the bottom wall 112 may be integrally formed with the side wall 111 such that the bottom wall 112 is securely connected to the side wall 111. In other embodiments, the bottom wall 112 may be provided separately from the side wall 111 and integrally fixed thereto.

The bottom wall 112 and the side wall 111 may together enclose the receiving chamber 110.

In the process of assembling the battery 100, after the battery cell group 20 attacks and the opening 113 enters the accommodating cavity 110, the battery cell group 20 may be disposed on the bottom wall 112 and carried by the bottom wall 112.

In the above embodiment, the bottom wall 112 may carry the battery cell group 20, so as to facilitate positioning of the battery cell group 20.

Referring to fig. 4 and 6, according to some embodiments of the present application, the battery cell group 20 includes a plurality of battery cells 21, an electrode terminal 211 is disposed on a side of the battery cells 21 facing away from the bottom wall 112, and a projection of the protrusion 122 overlaps with a projection portion of the electrode terminal 211 along the first direction X.

The electrode terminals 211 are members of the battery cells 21 for discharging electric energy.

The side of the battery cell 21 facing away from the bottom wall 112 is provided with an electrode terminal 211, i.e., the electrode terminal 211 is provided at the side of the battery cell 21 near the cover 12.

In some embodiments, the protrusion 122 may extend in the second direction Y, which intersects the first direction X, the protrusion 122 having a larger size in the second direction Y, and the protrusion 122 partially overlaps the electrode terminal 211 as viewed in the first direction X. In some embodiments, the second direction Y may be perpendicular to the first direction X.

The projection of the protrusion 122 in the first direction X partially overlaps the projection of the electrode terminal 211 in the first direction X, and the space utilization of the battery cell stack 20 in the height direction of the case 11 is high, so that the battery 100 has a high energy density.

According to some embodiments of the present application, there is further provided an electrical device including the battery 100 provided in any of the above embodiments.

Battery 100 is used to provide electrical power to powered devices.

The powered device is any of the devices described above that employ battery 100.

Referring to fig. 12, fig. 12 is a flow chart illustrating a method for manufacturing a battery according to some embodiments of the application. According to some embodiments of the present application, there is provided a method of manufacturing a battery, the method comprising:

410, providing a box 11, wherein the box 11 comprises a side wall 111 and a bottom wall 112, the side wall 111 is arranged around the bottom wall 112 in a surrounding manner, one end of the side wall 111 is connected with the bottom wall 112, and the other end of the side wall 111 forms an opening 113;

420, providing a first seal 31 and a second seal 32, the first seal 31 and the second seal 32 being integrally formed, the first seal 31 comprising a first portion 311 and a second portion 312, the second seal 32 comprising a third portion 321 and a fourth portion 322;

430, providing a battery cell group 20, wherein the battery cell group 20 comprises a plurality of battery cells 21;

440, providing a cover 12, wherein the cover 12 comprises a body 121 and a protruding part 122, and the protruding part 122 is arranged on one side of the body 121;

450, placing the battery cell group 20 inside the case 11, the electrode terminals 211 of the battery cells 21 being located at a side of the battery cells 21 facing away from the bottom wall 112;

460, the first portion 311 is adhered to the inner surface of the first side wall 111a, the second portion 312 is adhered to the first end surface 111d of the first side wall 111a, the third portion 321 is adhered to the inner surface of the second side wall 111b, and the fourth portion 322 is adhered to the second end surface 111e of the second side wall 111 b;

470, covering the opening 113 with the body 121, wherein the protruding part 122 protrudes from the side of the body 121 facing the case 11, a part of the protruding part 122 protrudes into the case 11, and the protruding part 122 is located inside the side wall 111;

480, the body 121 and the second side wall 111b are connected by the second fastener 42, and the first side wall 111a and the projection 122 are connected by the first fastener 41.

In the above preparation method, the order of the steps is not exclusive, and only the steps of the preparation method are shown. For example, the steps "410, providing the case 11", the step "420", providing the first seal 31 and the second seal 32", the step" 430 ", providing the battery cell group 20", the step "440", and providing the cover 12 "may be performed sequentially, or may be performed in other orders, for example, the steps" 440, providing the cover 12", the step" 430, providing the battery cell group 20", the step" 420 ", providing the first seal 31 and the second seal 32", and the step "410, and providing the case 11" may be performed sequentially, which are not specifically mentioned herein.

Wherein the body 121 is provided with a second through hole 121a, the second end surface 111e is provided with a second threaded hole 111f, the fourth portion 322 is provided with a fourth through hole 323, and the second fastener 42 passes through the second through hole 121a and the fourth through hole 323 and is connected to the second threaded hole 111f. The first sidewall 111a is provided with a first through hole 111c, the first portion 311 is provided with a third through hole 313, the protrusion 122 is provided with a first screw hole 122a, and the first fastener 41 passes through the first through hole 111c and the third through hole 313 and is connected to the first screw hole 122a.

In some embodiments, when the second fastener 42 locks the body 121 with the second sidewall 111b, the second portion 312 and the fourth portion 322 can be made to have a certain amount of compression in the thickness direction (Z direction) of the body 121, reducing the risk of moisture entering the interior of the case 11. After the second fastener 42 locks the body 121 with the second sidewall 111b, the first through hole 111c corresponds to the first threaded hole 122a, and the first fastener 41 passes through the first through hole 111c and the third through hole 313 and is connected to the first threaded hole 122a.

The second fastener 42 locks the body 121 and the second side wall 111b in the thickness direction (Z direction) of the body 121, and the first fastener 41 locks the first side wall 111a and the protrusion 122 in the first direction X, so that the risk of deformation of the body 121 or the case 11 due to tolerance can be reduced, and the air tightness between the case 11 and the cover 12 is improved.

Referring to fig. 2 to 11, according to some embodiments of the present application, a battery 100 is provided, and the battery 100 includes a case 11 and a battery cell stack 20. The case 11 includes a side wall 111, a bottom wall 112, a cover 12, a first seal 31, a second seal 32, a first fastener 41, and a second fastener 42.

The side wall 111 is disposed around the bottom wall 112, one end of the side wall 111 is connected to the bottom wall 112, and the other end of the side wall 111 forms an opening 113. The side walls 111 include two first side walls 111a and two second side walls 111b, the two first side walls 111a are oppositely arranged along the first direction X, the two second side walls 111b are oppositely arranged along the second direction Y, the two first side walls 111a and the two second side walls 111b enclose a square structure, and the first direction X, the second direction Y and the thickness direction (Z direction) of the body 121 are perpendicular to each other. The first side wall 111a has a first end surface 111d facing the body 121, the first side wall 111a is provided with a first through hole 111c, the second side wall 111b has a second end surface 111e facing the body 121, and the second end surface 111e is provided with a second threaded hole 111f. The battery cell group 20 includes a plurality of battery cells 21, the battery cell group 20 is disposed inside the case 11, and an electrode terminal 211 is disposed on a side of the battery cell 21 facing away from the bottom wall 112.

The cover 12 includes a body 121 and a protrusion 122, and the protrusion 122 is protruded on a side of the body 121 facing the case 11. The body 121 is provided with a second through hole 121a, and the protrusion 122 is provided with a first threaded hole 122a. The protruding portions 122 are provided in two, two protruding portions 122 are in one-to-one correspondence with two first side walls 111a, and each protruding portion 122 is in correspondence with one first side wall 111 a.

The first sealing member 31 and the second sealing member 32 are integrally formed, the first sealing member 31 and the second sealing member 32 are respectively provided with two, the two first sealing members 31 are in one-to-one correspondence with the two first side walls 111a, the two second sealing members 32 are in one-to-one correspondence with the two second side walls 111b, and the two first sealing members 31 and the two second sealing members 32 form an annular structure.

The first seal 31 includes a first portion 311 and a second portion 312 connected to each other, the first portion 311 being provided on the inner surface of the first side wall 111a, the first portion 311 being provided with a third through hole 313, the second portion 312 being connected to the first end face 111d.

The second seal 32 includes a third portion 321 and a fourth portion 322 connected to each other, the third portion 321 being provided on the inner surface of the second side wall 111b, the fourth portion 322 being connected to the second end surface 111e, the fourth portion 322 being provided with a fourth through hole 323.

The first portion 311 is connected to the third portions 321 of the two second seals 32 at both ends in the second direction Y, respectively, and the second portion 312 is connected to the fourth portions 322 of the two second seals 32 at both ends in the second direction Y, respectively. The first fastener 41 passes through the first through hole 111c and the third through hole 313 and is connected to the first screw hole 122a, and the second fastener 42 passes through the second through hole 121a and the fourth through hole 323 and is connected to the second screw hole 111f. The protruding portion 122 extends in the second direction Y, and an end of the protruding portion 122 in the second direction Y abuts against the third portion 321. In the first direction X, the body 121 does not protrude beyond the outer surface of the first sidewall 111 a. Along the third direction Z, the projection of the protruding portion 122 overlaps with the projection of the battery unit group 20, and the third direction Z, the first direction X and the second direction Y are perpendicular to each other. In the first direction X, the projection of the projection 122 partially overlaps with the projection of the electrode terminal 211. The end of the projection 122 remote from the body 121 is formed with a guide surface 122b.

In the above embodiment, the distance between the battery cell group 20 and the side wall 111 of the case 11 is small, and the utilization ratio of the case 11 in the height direction of the case 11 is high, so that more battery cell groups 20 can be provided inside the case 11, and the battery 100 has a high energy density.

While the application has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the application. In particular, the technical features mentioned in the respective embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims

1. A battery, comprising:

a battery cell stack;

the box, the box includes:

the side wall encloses a containing cavity for containing the battery cells, one end of the side wall forms an opening of the containing cavity, and the inner surface of the side wall is not provided with a protruding structure; the side walls comprise two first side walls which are oppositely arranged along a first direction, the box body further comprises two second side walls which are oppositely arranged along a second direction, and the first direction is intersected with the second direction;

The cover body is used for covering the opening and comprises a body and a protruding part, the body is provided with a first surface facing the side wall, the protruding part is protruding on the first surface, and the protruding part is used for extending into the accommodating cavity and is connected with the side wall; the battery monomer group is accommodated in the accommodating cavity of the box body;

the box body further comprises a bottom wall, the side wall is arranged around the bottom wall in a surrounding mode, the other end of the side wall is connected with the bottom wall, and the battery cell group is arranged on the bottom wall;

the battery monomer group comprises a plurality of battery monomers, an electrode terminal is arranged on one side, deviating from the bottom wall, of each battery monomer, and the projection of the protruding part is overlapped with the projection part of the electrode terminal along the first direction.

2. The battery according to claim 1, wherein two of the protruding portions are provided, the two protruding portions are in one-to-one correspondence with the two first side walls, and each of the protruding portions is connected with the corresponding first side wall.

3. The battery of claim 2, wherein the body does not extend beyond the outer surface of the first sidewall in the first direction.

4. The battery of claim 2, wherein the case further comprises a first fastener, the first sidewall being connected to the protrusion by the first fastener.

5. The battery of claim 4, wherein the first sidewall is provided with a first through hole, the protrusion is provided with a first threaded hole, and the first fastener passes through the first through hole and is connected to the first threaded hole.

6. The battery of claim 2, wherein the housing further comprises a second fastener, the second sidewall being connected to the body by the second fastener.

7. The battery of claim 6, wherein the second sidewall has a second end face facing the body, the second end face being provided with a second threaded bore, the body being provided with a second through bore, the second fastener passing through the second through bore and being connected to the second threaded bore.

8. The battery of claim 2, wherein the case further comprises a first seal disposed between the first sidewall and the cover and a second seal disposed between the second sidewall and the cover.

9. The battery of claim 8, wherein the first seal comprises first and second interconnected portions, the first portion being located between an inner surface of the first sidewall and the projection, the first sidewall having a first end face facing the body, the second portion being located between the first end face and the body.

10. The battery of claim 8, wherein the second seal includes a third portion and a fourth portion connected to each other, the third portion being located on an inner surface of the second sidewall, the second sidewall having a second end face facing the body, the fourth portion being located between the second end face and the body.

11. The battery according to claim 10, wherein the protruding portion extends in a second direction, and an end portion of the protruding portion in the second direction abuts the third portion.

12. The battery of claim 8, wherein the first seal and the second seal are integrally formed.

13. The battery according to any one of claims 1 to 12, wherein an end of the protruding portion remote from the body is formed with a guide surface.

14. The battery of claim 1, wherein the projection of the protrusion partially overlaps the projection of the battery cell stack in a third direction, the first direction, and the second direction being perpendicular to each other.

15. A powered device comprising a battery as claimed in any one of claims 1-14.