WO2023050888A1

WO2023050888A1 - Battery and electrical device

Info

Publication number: WO2023050888A1
Application number: PCT/CN2022/098473
Authority: WO
Inventors: 汪用广; 黄仰枝; 季进清; 刘建华; 林壮壮
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2021-09-28
Filing date: 2022-06-13
Publication date: 2023-04-06
Also published as: CN215955400U

Abstract

The present application discloses a battery and an electrical device. The battery comprises a housing, a battery cell, a cover and a sealing member, wherein the housing has an opening; the battery cell is accommodated in the housing; the cover comprises a main body portion for covering the opening and a mounting portion connected to the main body portion, and the mounting portion extends into the housing by passing through the opening; the sealing member comprises an annular fixing portion sleeved on the mounting portion, and a deformation portion that extends from the annular fixing portion away from the mounting portion, and the deformation portion comprises at least one protrusion that extends from the annular fixing portion away from the mounting portion. When the cover and the housing are closed, along the radial direction of the opening, the annular fixing portion and the protrusions are sequentially arranged between the mounting portion and the housing. The protrusions are used for deforming and abutting against the inner surface of the housing, so that the sealing member is clamped between the mounting portion and the inner surface of the housing and seals the opening. The battery provided in the present application may avoid an obvious seam between the cover and the housing.

Description

Batteries and Consumers

Cross References to Related Applications

This application claims priority to the Chinese patent application 202122368836.5 filed on September 28, 2021, entitled "Battery and Electric Device", the entire content of which is incorporated herein by reference.

technical field

The present application relates to the technical field of energy storage devices, in particular to a battery and an electrical device.

Background technique

Battery cells are widely used in electronic equipment, such as mobile phones, laptop computers, battery cars, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc. The battery cells may include nickel-cadmium battery cells, nickel-hydrogen battery cells, lithium-ion battery cells, secondary alkaline zinc-manganese battery cells, and the like.

When in use, the battery cells are generally accommodated in a box, and the box can prevent liquid or other foreign objects from affecting the charging or discharging of the battery cells. How to ensure the airtightness of the cabinet has always been a research direction in the industry.

To sum up, it is necessary to design a battery and an electrical device to solve the above technical problems.

Contents of the invention

The embodiment of the present application provides a battery and an electrical device. By arranging a seal between the installation part and the inner surface of the housing in the radial direction of the opening, the sealing performance of the housing and the cover is improved, and the cover is avoided. After being closed with the shell, there is an obvious seam between the cover and the shell.

In a first aspect, the present application provides a battery, including: a casing, a battery cell, a cover and a seal, the casing has an opening; the battery cell is accommodated in the casing; the cover includes a main body for covering the opening part and the installation part connected with the main body part, the installation part protrudes into the housing through the opening; the seal includes an annular fixing part sleeved on the installation part, and a deformation part extending from the ring fixing part to a direction away from the installation part, The deformation part includes at least one protrusion extending from the ring-shaped fixing part to the direction away from the installation part. When the cover and the housing are closed, the ring-shaped fixing part and the protrusion are sequentially arranged on the installation part and the housing along the radial direction of the opening. Between the protrusions, the protrusion is used to deform and press against the inner surface of the housing, so that the seal is clamped between the mounting part and the inner surface of the housing and seals the opening.

In the technical solution of the embodiment of the present application, by setting the seal between the mounting part and the inner surface of the housing in the radial direction of the opening, the size of the seal does not affect the cooperation between the cover and the housing in the axial direction of the opening. Avoid obvious seams between the cover and the shell after the cover and the shell are closed; at the same time, when the cover and the shell are closed, debris will be generated by friction between the cover and the shell, radial clamping The seal held between the mounting part and the inner surface of the housing can prevent debris from falling onto the battery cell, avoiding debris from affecting the operation of the battery cell, and improving battery life; compared with the prior art, the cover body Or the shell is provided with a groove to accommodate the seal, and the application sets the installation part, and then the seal is sleeved on the installation part, which can effectively avoid the technical problems that the seal is easy to fall off and the groove is easy to accumulate foreign matter during the covering process; To provide grooves on the housing, so that the battery provided by the application can reduce the wall thickness of the housing, thereby reducing production costs; the stable connection between the sealing member and the mounting part can be realized through the ring-shaped fixing part, and the deformation part can be mainly used. The deformation enables the seal to be pressed against the inner surface of the housing.

In some embodiments, the housing includes a side wall forming an opening, and along the radial direction of the opening, the length of the protrusion is greater than the distance from the annular fixing portion to the side wall. After the cover and the shell are closed, the protrusion must be deformed to adapt to the distance from the ring-shaped fixing part to the side wall, so as to ensure that the sealing member can effectively seal the shell and the cover.

In some embodiments, the protrusion includes a first surface bent and extended from the ring-shaped fixing part, and a second surface disposed on the side of the first surface away from the main part. When the cover and the housing are closed, the protrusion is away from One end of the ring-shaped fixing portion is bent and deformed, and the second surface abuts against the side wall. The protrusion not only produces compression deformation along the radial direction of the opening, but also undergoes bending deformation, which increases the area where the protrusion contacts the inner surface; through bending deformation, part of the protrusion is accommodated between the mounting part and the inner surface, avoiding Due to the large size of the protrusion, the problem of deformation of the cover or housing is caused.

In some embodiments, the protrusion extends from the ring-shaped fixing part toward the main body, and a stacking space is formed between the ring-shaped fixing part, the first surface and the side wall. When the cover and the casing are closed, the protrusion is far away from One end of the ring-shaped fixing part is bent and deformed, and is accommodated in the stacking space. By setting the protrusion to extend from the ring-shaped fixing part to the direction close to the main part, the debris generated by the friction between the cover and the shell can be accommodated in the stacking space, and at the same time, after the shell and the cover are opened, the debris remains It can be accommodated in the stacking space, and will not fall onto the battery cell due to the looseness between the shell and the cover.

In some embodiments, the deformation portion includes a plurality of protrusions arranged at intervals along the axial direction of the opening. By providing a plurality of protrusions, the sealing performance of the casing and the cover is increased.

In some embodiments, the main body includes a limiting step that interferes with the side wall, and the limiting step includes a first covering surface that fits with the end surface of the side wall, and a first covering surface bent and extended from the first covering surface. Two covering surfaces, the second covering surface is in contact with the inner surface of the opening formed by the side wall. The main body and the side wall are interferingly engaged by setting the limiting step, thereby further improving the sealing of the shell and the cover and the stability of the connection.

In some embodiments, the installation part includes an installation surface opposite to the inner surface, and a connection surface connecting the installation surface and the second covering surface, and the ring-shaped fixing part includes a third surface and a fourth surface opposite to each other. Four surfaces are connected with the protrusion, and the third surface is in contact with the installation surface. The installation part is formed by extending from the second covering surface of the installation step, so that the installation part and the side wall are oppositely arranged, and a gap for accommodating the seal can be left between the installation part and the side wall to ensure the stability of the connection between the seal and the installation part .

In some embodiments, the sealing member further includes a connecting portion bent and extended from one end of the ring-shaped fixing portion, the connecting portion and the protrusion are respectively arranged on opposite sides of the ring-shaped fixing portion, and the ring-shaped fixing portion and the connecting portion are formed and installed The matching installation steps are provided, and the connection part is connected with the installation part. The stability of the connection between the sealing member and the installation part is further improved by setting the connection part to connect with the installation part.

In some embodiments, the connection part is glued on the end surface of the installation part away from the main part. The connection part and the installation part are connected by bonding, so that the processing is convenient.

In a second aspect, the present application provides an electric device, the electric device includes the above-mentioned battery, and the battery is used to provide electric energy.

The above description is only an overview of the technical solution of the present application. In order to better understand the technical means of the present application, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and understandable , the following specifically cites the specific implementation manner of the present application.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings that need to be used in the embodiments of the present application. Obviously, the accompanying drawings described below are only some embodiments of the present application. Those of ordinary skill in the art can also obtain other drawings based on these drawings without making creative efforts.

FIG. 1 is a schematic cross-sectional structure diagram of a battery in the prior art;

FIG. 2 is an enlarged structural schematic diagram of part A of the battery in the prior art shown in FIG. 1;

Fig. 3 is a schematic structural diagram of a vehicle in some embodiments of the present application;

FIG. 4 is a schematic diagram of an exploded structure of a battery in some embodiments of the present application;

5 is a schematic diagram of an exploded structure of a battery cell in some embodiments of the present application;

FIG. 6 is a schematic diagram of a three-dimensional structure of a battery in some embodiments of the present application;

Fig. 7 is a schematic cross-sectional structure diagram of the battery shown in Fig. 6 along the line B-B;

Fig. 8 is a schematic diagram showing an enlarged structure of part C of the battery shown in Fig. 7;

FIG. 9 is a schematic diagram of a disassembled structure of a battery in some embodiments of the present application;

Fig. 10 is a schematic diagram of an enlarged structure of part D of the battery shown in Fig. 9;

Fig. 11 is a schematic diagram of the principle of deformation of the sealing member of the battery according to some embodiments of the present application.

The attached reference numbers are as follows:

An upper cover 1a, a battery cell 1b, a lower cover 1c, and a sealing member 1d;

vehicle 1000;

battery 100, controller 200, motor 300;

Housing 1, side wall 11, inner surface 111, opening 12;

battery cell 2, end cap 21, electrode terminal 21a, casing 22, cell assembly 23;

Sealing member 3, annular fixing part 31, third surface 311, fourth surface 312, deformation part 32, first surface 321, second surface 322, connecting part 33, protrusion 34, stacking space 35;

Cover body 4, main body part 41, first covering surface 411, second covering surface 412, installation part 42, connection surface 431, installation surface 432;

Electric connection structure 5, handle 6.

Detailed ways

Embodiments of the technical solutions of the present application will be described in detail below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical scheme of the present application more clearly, therefore only as an example, and can not limit the protection scope of the present application with this.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the application; the terms used herein are only for the purpose of describing specific embodiments, and are not intended to To limit this application; the terms "comprising" and "having" and any variations thereof in the specification and claims of this application and the description of the above drawings are intended to cover a non-exclusive inclusion.

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 should not be understood as indicating or implying relative importance or implicitly indicating the number, specificity, or specificity of the indicated technical features. Sequence or primary-secondary relationship. In the description of the embodiments of the present application, "plurality" means two or more, unless otherwise specifically defined.

Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The occurrences of this phrase 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. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the embodiment of the present application, the term "and/or" is only a kind of association relationship describing associated objects, which means that there may be three kinds of relationships, such as A and/or B, which may mean: A exists alone, and A exists at the same time and B, there are three cases of B alone. In addition, the character "/" in this article generally indicates that the contextual objects are an "or" relationship.

In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), similarly, "multiple groups" refers to more than two groups (including two), and "multiple pieces" refers to More than two pieces (including two pieces).

In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical" "Horizontal", "Top", "Bottom", "Inner", "Outer", "Clockwise", "Counterclockwise", "Axial", "Radial", "Circumferential", etc. indicate the orientation or positional relationship based on the drawings Orientation or positional relationship is only for the convenience of describing the embodiment of the present application and simplifying the description, and does not indicate or imply 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 an implementation of the present application. Example limitations.

In the description of the embodiments of this application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection" and "fixation" should be interpreted in a broad sense, for example, it can be a fixed connection or a fixed connection. Disassembled connection, or integration; it can also be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediary, and it can be the internal communication of two components or the interaction relationship between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present application according to specific situations.

At present, judging from the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only used in energy storage power systems such as hydraulic, thermal, wind and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric vehicles, as well as military equipment and aerospace and other fields . With the continuous expansion of power battery application fields, its market demand is also constantly expanding.

Please refer to Fig. 1 and Fig. 2, the inventors have noticed that currently a battery needs to be provided with a box to place one or more battery cells 1b, usually a seal 1d is provided between the upper cover 1a and the lower cover 1c of the box, To isolate external water vapor and improve battery life. In the prior art, a groove structure is usually provided on the upper cover 1a and/or the lower cover 1c to place the seal 1d. When the upper cover 1a and the lower cover 1c are closed along the axial direction of the box, the upper cover 1a and the lower cover 1c squeeze The sealing member 1d is pressed so that the sealing member 1d is deformed, and is pressed between the upper cover 1a and the lower cover 1c along the axial direction of the box to realize sealing of the box. When the size of the sealing part 1d is too large, it may cause an obvious seam between the upper cover 1a and the lower cover 1c; There is a gap between them, which affects the sealing of the box. At the same time, during the closing process of the upper cover 1a and the lower cover 1c, the upper cover 1a and the lower cover 1c may be scratched, and the debris generated by the scratches will fall on the battery cell 1b, which may affect the normal operation of the battery cell 1b and reduce the product quality. stability.

In order to solve the problem of poor sealing of the upper cover and the lower cover due to the size of the seal being too large or too small, the inventor has designed a battery after in-depth research. The cover includes a main body that covers the opening and a The installation part is connected with the main body, and the installation part extends into the casing through the opening; and the sealing element is sleeved on the installation part and clamped between the installation part and the inner surface of the casing to seal the opening. The seal is clamped between the mounting part and the inner surface of the housing along the radial direction of the opening, and the size of the seal does not affect the fit between the cover and the housing along the axial direction of the opening, preventing the cover and the housing from being closed. There is an obvious seam between the cover and the shell; at the same time, during the closing process of the cover and the shell, debris is generated by friction between the cover and the shell, which is radially clamped on the inner surface of the mounting part and the shell The seal between them can prevent debris from falling onto the battery cell, avoiding debris from affecting the operation of the battery cell, and improving battery life; compared with the prior art, a groove is provided on the cover or housing to accommodate the seal. The application sets the installation part, and then sets the seal on the installation part, which can effectively avoid the technical problems that the seal is easy to fall off and the groove is easy to accumulate foreign matter during the covering process; The battery provided by the application can reduce the wall thickness of the shell, thereby reducing the production cost.

The battery cells disclosed in the embodiments of the present application can be used, but not limited to, in electric devices such as vehicles, ships or aircrafts. The power supply system comprising the battery unit and battery disclosed in this application can be used to form the electrical device, which is conducive to alleviating and automatically adjusting the deterioration of the expansion force of the battery cell, supplementing the consumption of the electrolyte, and improving the stability of battery performance and battery life. .

The embodiment of the present application provides an electric device using a battery as a power source. The electric device can be, but not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric boat toys, electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, spaceships, etc.

In the following embodiments, for the convenience of description, a vehicle 1000 as an electric device according to an embodiment of the present application is taken as an example for description.

Please refer to FIG. 3 , which is a schematic structural diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle. The interior of the vehicle 1000 is provided with a battery 100 , and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000 . The battery 100 can be used for power supply of the vehicle 1000 , for example, the battery 100 can be used as an operating power source of the vehicle 1000 . The vehicle 1000 may further include a controller 200 and a motor 300 , the controller 200 is used to control the battery 100 to supply power to the motor 300 , for example, for starting, navigating and running the vehicle 1000 .

In some embodiments of the present application, the battery 100 can not only be used as an operating power source for the vehicle 1000 , but can also be used as a driving power source for the vehicle 1000 , replacing or partially replacing fuel oil or natural gas to provide driving power for the vehicle 1000 .

Please refer to FIG. 4 , which is an exploded view of a battery 100 provided by some embodiments of the present application. The battery 100 includes a case 1 , a battery cell 2 and a cover 4 . In some embodiments, the box body may include a cover 4 and a casing 1 , the cover 4 and the casing 1 cover each other, and the cover 4 and the casing 1 jointly define an accommodating space for accommodating the battery cells 2 . The housing 1 can be a hollow structure with an open end, and the cover 4 can be a plate-shaped structure, and the cover 4 is covered on the opening side of the housing 1, so that the cover 4 and the housing 1 jointly define an accommodation space; 4 and the housing 1 can also be hollow structures with one side opening, and the opening side of the cover body 4 covers the opening side of the housing 1 . Certainly, the box body formed by the cover body 4 and the casing body 1 may be in various shapes, such as a cylinder, a cuboid, and the like.

In the battery 100 , there may be multiple battery cells 2 , and the multiple battery cells 2 may be connected in series, in parallel or in parallel. The mixed connection means that the multiple battery cells 2 are connected in series and in parallel. A plurality of battery cells 2 can be directly connected in series or in parallel or mixed together, and then the whole body composed of a plurality of battery cells 2 is accommodated in the box; of course, the battery 100 can also be a plurality of battery cells 2 connected in series first Or parallel or mixed connection to form a battery module form, and multiple battery modules are connected in series or parallel or mixed to form a whole, and accommodated in the box. The battery 100 may also include other structures, for example, the battery 100 may also include a bus component for realizing electrical connection between multiple battery cells 2 .

Wherein, each battery cell 2 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but not limited thereto. The battery cell 2 can be in the form of a cylinder, a flat body, a cuboid or other shapes.

Please refer to FIG. 5 , which is a schematic diagram of an exploded structure of a battery cell 2 provided by some embodiments of the present application. A battery cell 2 refers to the smallest unit that makes up a battery. As shown in FIG. 5 , the battery cell 2 includes an end cover 21 , a casing 22 , a cell assembly 23 and other functional components.

The end cap 21 refers to a component that covers the opening of the casing 22 to isolate the internal environment of the battery cell 2 from the external environment. Without limitation, the shape of the end cap 21 can be adapted to the shape of the housing 22 to fit the housing 22 . Optionally, the end cap 21 can be made of a material (such as aluminum alloy) with a certain hardness and strength, so that the end cap 21 is not easy to deform when being squeezed and collided, so that the battery cell 2 can have a higher Structural strength and safety performance can also be improved. Functional components such as electrode terminals 21 a may be provided on the end cap 21 . The electrode terminal 21 a can be used for electrical connection with the battery cell assembly 23 for outputting or inputting electric energy of the battery cell 2 . In some embodiments, the end cover 21 may also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 2 reaches a threshold value. The material of the end cap 21 can also be various, for example, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in this embodiment of the present application. In some embodiments, an insulator can be provided inside the end cover 21 , and the insulator can be used to isolate the electrical connection components in the housing 22 from the end cover 21 to reduce the risk of short circuit. Exemplarily, the insulating member may be plastic, rubber or the like.

The shell 22 is a component used to cooperate with the end cap 21 to form the internal environment of the battery cell 2 , wherein the formed internal environment can be used to accommodate the cell assembly 23 , electrolyte and other components. The shell 22 and the end cover 21 can be independent parts, and an opening can be provided on the shell 22 , and the internal environment of the battery cell 2 can be formed by making the end cover 21 cover the opening at the opening. Without limitation, the end cover 21 and the shell 22 can also be integrated. Specifically, the end cover 21 and the shell 22 can form a common connection surface before other components are put into the shell, and when the inside of the shell 22 needs to be encapsulated, then Make the end cover 21 cover the shell 22 . The housing 22 can be in various shapes and sizes, such as cuboid, cylinder, hexagonal prism and so on. Specifically, the shape of the casing 22 can be determined according to the specific shape and size of the cell assembly 23 . The housing 22 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in this embodiment of the present application.

The cell assembly 23 is a component in the battery cell 100 where the electrochemical reaction occurs. One or more cell assemblies 23 may be contained in the housing 22 . The cell assembly 23 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and usually a separator is provided between the positive electrode sheet and the negative electrode sheet. The part of the positive electrode sheet and the negative electrode sheet with the active material constitutes the main body of the cell assembly, and the parts of the positive electrode sheet and the negative electrode sheet without the active material respectively constitute tabs. The positive pole tab and the negative pole tab can be located at one end of the main body together or at both ends of the main body. During the charging and discharging process of the battery, the positive active material and the negative active material react with the electrolyte, and the tabs are connected to the electrode terminals to form a current loop.

According to some embodiments of the present application, please refer to FIG. 6 to FIG. 9 together. FIG. 6 is a schematic three-dimensional structure diagram of a battery according to some embodiments of the present application, and FIG. 7 is a schematic cross-sectional structure diagram of the battery shown in FIG. 6 along line B-B; FIG. 8 is a schematic diagram of an enlarged structure of part C of the battery shown in FIG. 7 , and FIG. 9 is a schematic diagram of a disassembled structure of a battery according to some embodiments of the present application. The present application provides a battery, including: a casing 1, a battery cell 2, a cover 4 and a seal 3, the casing 1 has an opening 12; the battery cell 2 is accommodated in the casing 1; the cover 4 includes a The main body part 41 that covers the opening 12 and the installation part 42 connected with the main body part 41 , the installation part 42 extends into the housing 1 through the opening 12 ; the seal 3 is sleeved on the installation part 42 and clamped by the installation part 42 and the inner surface 111 of the housing 1 to seal the opening 12.

The housing 1 can be a structure with an opening 12 at one end, or a structure with openings 12 at opposite ends as shown in FIG. Inside. The side wall 11 of the housing 1 surrounds and forms a storage space for placing the battery cell 2. "The side wall 11 of the housing 1" refers to the outer wall of the housing 1 in a direction parallel to the height direction (the Y direction in FIG. 6 ). The wall 11 includes an inner surface 111 and an outer surface oppositely disposed, wherein the inner surface 111 is close to the battery cell 2 , and the outer surface is farther away from the battery cell 2 than the inner surface 111 . In this embodiment, since the opposite ends of the housing 1 are provided with openings 12, correspondingly, two covers 4 are provided to cover the two openings 12 respectively, and two sealing members 3 are provided respectively. Connect with two covers 4. Those skilled in the art can set the structure of the cover body 4 according to actual needs. For example: in the embodiment shown in FIG. The cover 4 below the 1 is provided with a power connection structure 5 to facilitate charging and discharging of the battery cells 2 through the power connection structure 5.

The installation part 42 extends into the housing 1 through the opening 12, and the sealing member 3 is sleeved on the installation part 42 and clamped between the installation part 42 and the inner surface 111 of the housing 1 to seal the opening 12, that is, to seal The part 3 is an elastically deformable part, and the deformed sealing part 3 can apply a deformation force to the mounting part 42 and the housing 1 along the radial direction of the opening 12 (direction X in FIG. 6 ), thereby sealing the opening 12 . The seal 3 can be sleeved on the installation part 42 through elastic deformation force, and can also be provided with grooves, slots and other structures on the installation part 42 to fit the seal 3 on the installation part 42, and can also be bonded , welding, etc. to connect the sealing member 3 to the installation part 42 at that time, the application part limits the connection method between the sealing member 3 and the installation part 42 .

In order to ensure that the heat generated by the battery cell 2 is conducted to the outside as soon as possible, the battery cell 2 is usually made of metal such as aluminum or steel, and of course it can also be made of other non-metallic materials. During the closing process of the cover 4 and the casing 1 , the cover 4 and the casing 1 are scratched, and debris may be generated between the cover 4 and the casing 1 . The sealing member 3 sandwiched between the mounting portion 42 and the inner surface 111 of the casing 1 in the radial direction of the opening 12 can prevent the debris from falling into the battery cell 2 .

In the technical solution of the embodiment of the present application, the seal 3 is clamped between the installation part 42 and the inner surface 111 of the housing 1 along the radial direction of the opening 12, and the size of the seal 3 does not affect the size of the cover along the axial direction of the opening 12. The cooperation between the body 4 and the shell 1 prevents the obvious seam between the cover 4 and the shell 1 after the cover 4 and the shell 1 are closed; Rubbing between the body 4 and the housing 1 generates debris, and the seal 3 clamped between the mounting part 42 and the inner surface 111 of the housing 1 along the radial direction of the opening 12 can prevent debris from falling onto the battery cell 2 , to prevent debris from affecting the work of the battery cell 2, and improve battery life; compared with the prior art, the cover 4 or the housing 1 is provided with a groove to accommodate the seal 3, and the present application provides a mounting part 42, and then the seal 3 is set on the installation part 42, which can effectively avoid the technical problems that the seal 3 is easy to fall off and the groove is easy to accumulate foreign matter during the covering process; since the groove is omitted on the casing 1, the battery provided by the application can be Thinning the wall thickness of the casing 1 reduces the production cost.

The seal 3 includes an annular fixing portion 31 sleeved on the mounting portion 42, and a deformation portion 32 extending from the annular fixing portion 31 in a direction away from the mounting portion 42. The deformation portion 32 is used to deform and press against the housing 1, so that the sealing member 3 is clamped between the installation part 42 and the inner surface 111 of the housing 1 and seals the opening 12.

The deformable portion 32 is an elastically deformable portion of the sealing member 3 , and of course the annular fixing portion 31 may also have elastic deformability. The shape of the deformation part 32 is various, specifically, it can be a wedge-shaped structure whose diameter increases successively along the direction from the shell 1 to the cover 4, so as to facilitate the cover 4 to fit on the shell 1; The shape of a semicircle protruding, this embodiment does not limit the specific shape of the deformation part 32 .

The stable connection between the sealing part 3 and the mounting part 42 can be realized through the annular fixing part 31, and the sealing part 3 can be pressed against the inner surface 111 of the housing 1 mainly through the deformation of the deformation part 32.

In some embodiments, the deformation part 32 includes at least one protrusion 34 extending from the annular fixing part 31 to the direction away from the installation part 42 , and when the cover body 4 and the housing 1 are closed, along the radial direction of the opening 12 , the ring shape The fixing portion 31 and the protrusion 34 are sequentially disposed between the mounting portion 42 and the housing 1 .

The axial direction of the opening 12 is the direction in which the battery cell 2 enters the housing 1. No matter the shape of the opening 12 is square, circular or other shapes, the radial direction of the opening 12 is the direction from the center to the edge of the opening 12. The diameter of the opening 12 is perpendicular to the axial direction of the opening 12. For example, the X direction shown in FIG. 6 is one of multiple radial directions. In the embodiment of the present application, the deformation part 32 is an annular protrusion 34 arranged around the annular fixing part 31 , the protrusion 34 and the annular fixing part 31 are arranged at an angle, and the gap between the protrusion 34 and the annular fixing part 31 is The space provided can accommodate debris generated by friction between the cover body 4 and the housing 1 .

Please refer to FIG. 9 , FIG. 10 and FIG. 11 . In some embodiments, the housing 1 includes a side wall 11 forming an opening 12 . Wall 11 distance.

Fig. 11 is a schematic diagram of the principle of deformation of the sealing member 3 of the battery according to some embodiments of the present application. From this figure 11, it can be seen that the length d1 is the radial length of the protrusion 34 along the opening 12, that is, when the protrusion 34 is not deformed, the plane where the protrusion 34 is connected to the annular fixing part is to the protrusion 34 The distance in the plane where the free end lies. The length d2 is the distance from the annular fixing portion 31 to the side wall 11 after the cover body 4 and the casing 1 are closed. When the cover body 4 and the housing 1 are closed, due to the large size of the protrusion 34, the protrusion 34 will inevitably be deformed to adapt to the distance from the annular fixing part 31 to the side wall 11, so as to ensure that the sealing member 3 can effectively seal Housing 1 and cover 4.

Please refer to FIG. 8 , FIG. 9 and FIG. 10 again, the protrusion 34 includes a first surface 321 bent and extended from the annular fixing portion 31 , and a second surface 322 disposed on the side of the first surface 321 away from the main body 41 , When the cover 4 and the housing 1 are closed, the end of the protrusion 34 away from the ring-shaped fixing portion 31 is bent and deformed, and the second surface 322 abuts against the side wall 11 .

The first surface 321 and the second surface 322 may be relatively parallel or non-parallel. For example, the first surface 321 and the second surface 322 can gradually approach along the direction from the center to the edge of the opening 12, so that the end of the protrusion 34 connected to the ring-shaped fixing part 31 is thicker than the end contacting the inner surface 111, thereby facilitating the bending of the protrusion 34. fold deformation. The protrusion 34 in this embodiment not only produces compression deformation along the radial direction of the opening 12, but also can undergo bending deformation, so that the area of the protrusion 34 in contact with the inner surface 111 increases and the airtightness is increased; at the same time, through the bending deformation Part of the protrusion 34 is accommodated between the mounting portion 42 and the inner surface 111 to avoid deformation of the cover 4 or the housing 1 due to the large size of the protrusion 34 .

The protrusion 34 extends from the ring-shaped fixing part 31 to the direction close to the main body part 41. A stacking space 35 is formed between the ring-shaped fixing part 31, the first surface 321 and the side wall 11. When the cover body 4 and the casing 1 are closed, An end of the protrusion 34 away from the annular fixing portion 31 is bent and deformed, and is accommodated in the stacking space 35 .

Since the cover 4 is closed toward the housing 1 , under the action of friction, the protrusion 34 will bend toward the main body 41 . By setting the protrusion 34 extending from the annular fixing portion 31 toward the main body 41 , it is ensured that when the cover 4 and the housing 1 are closed, the protrusion 34 must be bent toward the main body 41 . Simultaneously, the debris generated by friction between the cover body 4 and the housing 1 can be accommodated in the stacking space 35. After the housing 1 and the cover body 4 are opened simultaneously, the debris can still be accommodated in the stacking space 35. Due to the looseness between the casing 1 and the cover 4 , it fell onto the battery cell 2 .

The deformation portion 32 includes a plurality of protrusions 34 arranged at intervals along the axial direction of the opening 12 .

In this embodiment, the number of protrusions 34 is two, of course, more protrusions 34 may be provided as required to increase the sealing performance of the housing 1 and the cover 4 . The structures and sizes of the plurality of protrusions 34 can be consistent or inconsistent,

The main body 41 includes a limiting step that interferes with the side wall 11 , the limiting step includes a first covering surface 411 that fits with the end surface of the side wall 11 , and a second covering surface 411 bent and extended from the first covering surface 411 . The covering surface 412 , the second covering surface 412 is in contact with the inner surface 111 of the side wall 11 forming the opening 12 .

Specifically, the main body portion 41 may be a plate-like structure, or may be another structure capable of covering the opening 12 . In this embodiment, the limiting step includes a first covering surface 411 and a second covering surface 412, both of which are planes. In other embodiments, the limiting step It is also possible to include more surfaces, making the limit step shape more complex. The first covering surface 411 can also be a curved surface matched with the end surface of the side wall 11 to increase the airtightness of the casing 1 and the cover 4 . The body part 41 and the side wall 11 are interferingly engaged by setting the limiting step, thereby further improving the sealing and connection stability of the housing 1 and the cover body 4 .

The mounting portion 42 includes a mounting surface 432 opposite to the inner surface 111 and a connecting surface 431 connecting the mounting surface 432 and the second covering surface 412, and the annular fixing portion 31 includes a third surface 311 and a fourth surface opposite to each other. 312 , the fourth surface 312 is connected to the protrusion 34 , and the third surface 311 is in contact with the mounting surface 432 .

In this embodiment, the connection surface 431 is also a planar structure. In fact, the connection surface 431 may also be a curved surface forming a groove structure, so that the connection between the installation part 42 and the ring-shaped fixing part 31 is stable. The mounting part 42 is formed by extending from the second covering surface 412 of the mounting step, so that the mounting part 42 and the side wall 11 are oppositely arranged, and a gap for accommodating the seal 3 can be left between the mounting part 42 and the side wall 11 to ensure the seal 3 and the stability of the connection with the mounting part 42.

The seal 3 also includes a connecting portion 33 bent and extended from one end of the ring-shaped fixing portion 31 , the connecting portion 33 and the protrusion 34 are respectively arranged on opposite sides of the ring-shaped fixing portion 31 , and the ring-shaped fixing portion 31 and the connecting portion 33 form a The installation step matched with the installation part 42 , the connection part 33 is connected with the installation part 42 .

A groove can be provided on the mounting portion 42 so that the connecting portion 33 can be accommodated in the groove. At the same time, the connecting part 33 can be arranged on the end surface of the mounting part 42 away from the main part 41 by means of bonding. By connecting the connecting portion 33 and the mounting portion 42, the stability of the connection between the sealing member 3 and the mounting portion 42 is further improved, and the connecting portion 33 and the mounting portion 42 are connected by bonding, which facilitates processing.

According to some embodiments of the present application, the present application also provides an electric device, including the battery of any one of the above schemes, and the battery is used to provide electric energy for the electric device.

The electric device may be any of the aforementioned devices or systems using batteries.

According to some embodiments of the present application, referring to FIG. 6 to FIG. 11 , the present application provides a prismatic shell battery, in which a single battery cell 2 is accommodated in the shell, with openings 12 at both ends of the shell, and two covers 4 in two. Each seal 3 closes the two openings 12 respectively. The cover 4 includes a main body 41 for covering the opening 12 and a mounting portion 42 connected to the main body 41. The mounting portion 42 extends into the housing 1 through the opening 12. The mounting portion 42 is connected to the inner surface 111 of the housing 1. Relatively arranged; the sealing member 3 is sleeved on the ring-shaped fixing part 31 on the installation part 42, and the deformation part 32 extending from the ring-shaped fixing part 31 to the direction away from the installation part 42. The deformation part 32 includes two protrusions 34, two The first protrusion 34 is used to deform and press against the inner surface 111 of the housing 1 , so that the sealing member 3 is clamped between the installation portion 42 and the inner surface 111 of the housing 1 and seals the opening 12 .

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit it; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for 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 technical solutions of the various embodiments of the present application. All of them should be covered by the scope of the claims and description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in the various embodiments can be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

A battery comprising:

a housing having an opening;

a battery cell housed in the housing;

The cover body includes a main body for covering the opening and a mounting part connected to the main body, and the mounting part extends into the housing through the opening;

The sealing element includes an annular fixing portion sleeved on the mounting portion, and a deformation portion extending from the annular fixing portion in a direction away from the mounting portion, and the deformation portion includes at least one The fixing part is a protrusion extending away from the installation part. When the cover and the housing are closed, the ring-shaped fixing part and the protrusion are sequentially arranged on the radial direction of the opening. Between the installation part and the housing, the protrusion is used to deform and press against the inner surface of the housing, so that the seal is clamped between the installation part and the inner surface of the housing. between the surfaces and seal the opening.
The battery according to claim 1, wherein the case includes a side wall forming the opening, and the length of the protrusion is greater than that of the annular fixing portion to the side wall along the radial direction of the opening. distance.
The battery according to claim 2, wherein the protrusion includes a first surface bent and extended from the ring-shaped fixing portion, and a second surface disposed on a side of the first surface away from the main body portion When the cover body and the housing are closed, the end of the protrusion away from the annular fixing portion is bent and deformed, and the second surface abuts against the inner surface.
The battery according to claim 3, wherein the protrusion extends from the ring-shaped fixing portion toward the direction close to the main body, and there is a gap between the ring-shaped fixing portion, the first surface and the side wall A stacking space is formed, and when the cover body and the casing are closed, the end of the protrusion away from the annular fixing portion is bent and deformed, and is accommodated in the stacking space.
The battery according to any one of claims 1 to 4, wherein the deformation portion comprises a plurality of protrusions arranged at intervals along the axial direction of the opening.
The battery according to claim 2, wherein the main body part includes a limiting step that interferes with the side wall, and the limiting step includes a first covering surface that fits with the end surface of the side wall , and a second covering surface bent and extended from the first covering surface, the second covering surface is in contact with the inner surface of the side wall forming the opening.
The battery according to claim 6, wherein the installation portion includes an installation surface opposite to the inner surface and a connection surface connecting the installation surface and the second covering surface, and the annular The fixing part includes a third surface and a fourth surface oppositely arranged, the fourth surface is connected with the protrusion, and the third surface is in contact with the installation surface.
The battery according to claim 1, wherein the sealing member further includes a connecting portion bent and extended from one end of the annular fixing portion, and the connecting portion and the protrusion are respectively provided on the annular fixing portion On the opposite sides of each other, the ring-shaped fixing part and the connecting part form a mounting step matched with the mounting part, and the connecting part is connected to the mounting part.
The battery according to claim 8, wherein the connecting portion is glued on an end face of the mounting portion away from the main body portion.
An electrical device, comprising the battery according to any one of claims 1 to 9, the battery is used to provide electrical energy.