CN217114583U - Single end cover assembly of battery, single battery, battery and electric equipment - Google Patents

Abstract

The application discloses free end cover assembly of battery, battery monomer, battery and consumer. The end cover assembly comprises an end cover and an insulating layer, the end cover comprises a body and a limiting part, and the limiting part protrudes out of the surface of the body, which faces the electrode assembly of the battery monomer; the insulating layer is arranged on one side, facing the electrode assembly, of the end cover, and the insulating layer covers the body and the limiting part. In the technical scheme of this application, plastic structure under the cancellation, through set up spacing portion on the end cover, restrict electrode subassembly towards the displacement of end cover direction, guarantee the efficiency and the stability of electrode subassembly's operation to set up the insulating layer, insulate between end cover and the electrode subassembly, reduce electrode subassembly's electric energy leakage, guarantee the free safety of battery. The structure reduces the thickness of the end cover assembly and improves the energy density of the single battery, and meanwhile, the insulation and stability of the single battery are guaranteed.

Description

Single end cover assembly of battery, single battery, battery and electric equipment

Technical Field

The application relates to the field of batteries, in particular to a single end cover assembly of a battery, the single battery, the battery and electric equipment.

Background

The lithium ion battery as a novel secondary battery has the advantages of large energy density and power density, long cycle life, good safety, environmental protection and the like. With the development of modern society and the enhancement of environmental protection consciousness of people, more and more devices use lithium batteries as power supplies, such as mobile phones, notebook computers, electric tools, electric automobiles and the like, and a wide space is provided for the application and development of the lithium batteries.

At present, in addition to improving the conversion efficiency and safety of the battery, how to improve the energy density of the battery is also one of the important research points in the field.

SUMMERY OF THE UTILITY MODEL

In view of the above problem, the present application provides a free end cover assembly of battery, battery and consumer, has simplified the structure of end cover assembly, has reduced the volume of end cover assembly, has effectively promoted the free energy density of battery.

In a first aspect, the present application provides a battery cell end cap assembly comprising

The end cover comprises a body and a limiting part, wherein the limiting part protrudes out of the surface of the body facing the electrode assembly of the battery cell;

the insulating layer is arranged on one side, facing the electrode assembly, of the end cover and covers the body and the limiting part.

In the technical scheme of this application, set up spacing portion on the end cover, can restrict the displacement of electrode subassembly orientation end cover direction, guarantee the efficiency and the stability of electrode subassembly's operation to set up the insulating layer, insulate between end cover and the electrode subassembly, reduce electrode subassembly's electric energy leakage, guarantee the free safety of battery. Therefore, the structure reduces the thickness of the end cover assembly and improves the energy density of the battery monomer, and meanwhile, the insulativity and the stability of the battery monomer are guaranteed.

In some embodiments, the body and the position-limiting portion are integrally formed. By means of the technical scheme, the manufacturing efficiency of the end cover assembly is effectively improved.

In some embodiments, the end cap is provided with a pressure relief hole, and the limiting portion includes a first limiting portion and a second limiting portion disposed on two sides of the pressure relief hole. In the technical scheme, the first limiting part and the second limiting part are arranged to improve the stability of limiting the electrode assembly, and are arranged on two sides of the pressure relief hole, so that the balance of the end cover for limiting the electrode assembly is ensured.

In some embodiments, the first and/or second limiting portions are provided with weight-reducing portions. Through setting up and subtract heavy portion, can alleviate the weight of end cover, promote the free energy density of battery, reduce material cost simultaneously.

In some embodiments, the end cap assembly further comprises a protective layer disposed on a side of the insulating layer facing away from the end cap. The protective layer is arranged on the insulating layer, so that the end cover can be separated from the electrode assembly, and the electrode assembly can be protected.

In some embodiments, the protective layer includes a connecting portion, the end cap assembly further includes a first electrode terminal and a second electrode terminal mounted on the end cap, the end cap is further provided with a liquid injection hole, the connecting portion is used for connecting the insulating layer, and the connecting portion is provided with a first through hole, a second through hole, a third through hole and a fourth through hole respectively corresponding to the first electrode terminal, the liquid injection hole, the pressure relief hole and the second electrode terminal of the end cap. The suitability of the protective layer and the end cover is improved by arranging the through holes, and the function of the end cover is ensured to be normal.

In some embodiments, the connection part includes first and second receiving grooves recessed in a direction of the connection part toward the electrode assembly along one side of the connection part adjacent to the insulating layer and protruding the connection part, and the first and second receiving grooves receive and are connected to the first and second position limiting parts, respectively. In the structure, the first accommodating groove and the second accommodating groove are arranged to accommodate the first limiting part and the second limiting part, so that the thickness of the protective layer at the first limiting part and the second limiting part is unchanged.

In some embodiments, the protective layer further includes four side portions, at least one of the four side portions being connected with the connection portion, the side portions for protecting the electrode assembly. The four side parts are arranged for protecting the electrode assembly during the assembling process.

In some embodiments, the protective layer further comprises a bottom portion connected to the side portion. The above structure is used for protecting the bottom of the electrode assembly.

In some embodiments, the connecting portion, the plurality of side portions, and the bottom portion are an integrally formed structure. By the aid of the technical scheme, production efficiency of the protective layer can be effectively improved.

In some embodiments, the connection portion and the insulating layer are adhesively connected. The structure can effectively improve the convenience of production.

In some embodiments, the thickness D1 of the insulating layer satisfies the relationship D1 ≦ 55 μm. Through setting up reasonable insulating layer thickness, when guaranteeing insulating effect, reduce the volume that the insulating layer occupy, guarantee the free energy density of battery.

In some embodiments, the end cover assembly further includes a waterproof layer disposed between the insulating layer and the end cover, and the waterproof layer covers the body and the limiting portion. In the technical scheme, the waterproof layer is arranged to prevent the electrolyte from infiltrating the end cover, so that the service life of the end cover is prolonged.

In some embodiments, the waterproof layer is adhesively attached to the insulating layer. Through setting up the waterproof layer and bonding with the insulating layer, promote the efficiency of waterproof layer installation.

In some embodiments, the thickness D1 of the insulating layer and the thickness D2 of the water repellent layer satisfy the relationship of D1+ D2 ≦ 70 μm. Through the thickness that sets up reasonable insulating layer and waterproof layer, when satisfying insulating and water-proof effects, reduce the whole thickness of insulating layer and waterproof layer, guarantee the free energy density of battery.

In a second aspect, the present application provides a battery cell comprising

A housing having an opening;

the end cover assembly in the embodiment is used for covering the opening;

an electrode assembly disposed within the housing. In some embodiments, four sides of the protective layer are disposed between the case and the electrode assembly and respectively surround the sides of the electrode assembly.

In some embodiments, the bottom portion of the protective layer is disposed opposite to the connecting portion, and the bottom portion is connected to the plurality of side portions, respectively.

In a third aspect, the present application provides a battery including the battery cell of the above embodiment.

In a fourth aspect, the present application provides a powered device, which includes the battery in the above embodiments, and the battery is used for providing electric energy.

The foregoing description is only an overview of the technical solutions of the present application, and the present application can be implemented according to the content of the description in order to make the technical means of the present application more clearly understood, and the following detailed description of the present application is given in order to make the above and other objects, features, and advantages of the present application more clearly understandable.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

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

FIG. 2 is an exploded view of a battery according to some embodiments of the present application;

fig. 3 is an exploded view of the battery cell shown in fig. 2;

FIG. 4 is a schematic structural view of an end cap assembly provided in accordance with some embodiments of the present application;

FIG. 5 is a schematic view of a spacing portion according to some embodiments of the present disclosure;

FIG. 6 is a schematic diagram of a protective layer structure according to some embodiments of the present application;

FIG. 7 is a schematic diagram of a protective layer according to further embodiments of the present application;

FIG. 8 is a schematic perspective view of a protective layer according to some embodiments of the present disclosure;

fig. 9 is a schematic structural diagram of a protective layer according to further embodiments of the present application.

Detailed description of the reference numerals

1000. A vehicle;

100. a battery; 200. a controller; 300. a motor;

10. a box body; 11. a first portion; 12. a second portion;

20. a battery cell; 22. a housing; 23. an electrode assembly; 24. a pressure relief mechanism; 25. an electrode terminal;

21. an end cap assembly; 2101. an end cap; 2102. an insulating layer; 2103. a body; 2104. a limiting part; 2105. a first electrode terminal; 2106. a second electrode terminal; 2107. a liquid injection hole; 2108. a pressure relief vent; 2109. a first limiting part; 2110. a second limiting part; 2111. a weight reduction portion; 2112. a third limiting part; 2113. a fourth limiting part; 2114. a protective layer; 2115. a connecting portion; 2116. a first through hole; 2117. a second through hole; 2118. a third through hole; 2119. a fourth via hole; 2120. a side portion; 2121. a first accommodating groove; 2122. a second accommodating groove; 2125. a third accommodating groove; 2126. a fourth accommodating groove; 2127. a bottom portion.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are merely used to more clearly illustrate the technical solutions of the present application, and therefore are only examples, and the protection scope of the present application is not limited thereby.

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 herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application; the terms "including" and "having," and any variations thereof, in the description and claims of this application and the description of the above figures are intended to cover non-exclusive inclusions.

In the description of the embodiments of the present application, the technical terms "first", "second", and the like are used only for distinguishing different objects, and are not to be construed as indicating or implying relative importance or implicitly indicating the number, specific order, or primary-secondary relationship of the technical features indicated. In the description of the embodiments of the present application, "a plurality" means two or more unless specifically defined otherwise.

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 application. The appearances of the 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 explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.

In the description of the embodiments of the present application, the term "and/or" is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "plural sets" refers to two or more (including two), and "plural pieces" refers to two or more (including two).

In the description of the embodiments of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the directions or positional relationships indicated in the drawings, and are only for convenience of description of the embodiments of the present application and for simplicity of description, but do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the embodiments of the present application.

In the description of the embodiments of the present application, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used in a broad sense, and for example, may be fixedly connected, detachably connected, or integrated; mechanical connection or electrical connection is also possible; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.

The new energy automobile market develops rapidly, and the battery is as the power source of new energy automobile, and its work efficiency and the whole space that occupies are crucial to whole system. In particular, the higher the energy density of the battery cell, the better. Energy density refers to the ratio of the energy that can be charged to the mass or volume of the energy storage medium for a given electrochemical energy storage device.

In a battery cell, an electrode assembly, which is a main component for supplying electric power, and other components are generally included. The other parts may be a lower plastic structure connected with the end cap for insulation, or a stopper for limiting the electrode assembly, etc. Assuming that the power of the electrode assembly per unit volume or mass is not changed, the effect of increasing the energy density of the battery cell can be achieved by increasing the volume or mass of the electrode assembly or decreasing the volume or mass of other components.

Based on the above-mentioned idea, in order to improve the energy density of the battery cell, the inventor researches and designs an end cap assembly of the battery cell, which includes an end cap and an insulating layer. The end cover comprises a body and a limiting part, wherein the limiting part protrudes out of the surface of the body, which faces to the electrode assembly of the battery monomer. The insulating layer is arranged on one side, facing the electrode assembly, of the end cover, and the insulating layer covers the body and the limiting part.

In the technical scheme of this application, set up spacing portion on the end cover, can restrict electrode subassembly towards the displacement of end cover direction, guarantee the efficiency and the stability of electrode subassembly's operation, foretell structure has cancelled lower plastic on the original end cover subassembly, has effectively reduced the thickness of end cover subassembly itself to improve the inside space that is used for holding electrode subassembly of battery monomer, set up spacing portion simultaneously and realized spacing to electrode subassembly. And, through setting up the insulating layer, insulate between end cover and the electrode subassembly, reduce electrode subassembly's electric energy leakage, guarantee the free safety of battery. Therefore, the structure can improve the energy density of the battery monomer and ensure the stability and the insulativity of the end cover assembly.

The embodiment of the application provides an electric device using a battery as a power supply, wherein the electric device can be but is not limited to a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like. The electric toy may include a stationary or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, an electric airplane toy, and the like, and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, and the like.

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

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the present disclosure. The vehicle 1000 may be a fuel automobile, a gas automobile, or a new energy automobile, and the new energy automobile may be a pure electric automobile, a hybrid electric automobile, or a range-extended automobile, etc. The battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000. For example, the battery 100 may serve 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 being configured to control the battery 100 to supply power to the motor 300, for example, for starting, navigation, and operational power requirements while the vehicle 1000 is traveling.

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

Referring to fig. 2, fig. 2 is an exploded schematic view of a battery 100 according to some embodiments of the present disclosure. The battery 100 includes a case 10 and a battery cell (not shown in the drawings), which is accommodated in the case 10. The case 10 is used to provide a receiving space for the battery cells, and the case 10 may have various structures. In some embodiments, the case 10 includes a first portion 11 and a second portion 12, the first portion 11 and the second portion 12 cover each other, and the first portion 11 and the second portion 12 together define a receiving space for receiving the battery cell. The second part 12 may be a hollow structure with one open end, the first part 11 may be a plate-shaped structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a containing space; the first portion 11 and the second portion 12 may be both hollow structures with one side open, and the open side of the first portion 11 may cover the open side of the second portion 12. Of course, the case 10 formed by the first and second portions 11 and 12 may have various shapes, such as a cylinder, a rectangular parallelepiped, and the like.

In the battery 100, the number of the battery cells may be multiple, and the multiple battery cells may be connected in series or in parallel or in series-parallel, where in series-parallel refers to both series connection and parallel connection among the multiple battery cells. The plurality of battery cells may be directly connected in series or in parallel or in series-parallel, and the whole body formed by the plurality of battery cells is accommodated in the case 10. Of course, the battery 100 may also be a battery module formed by connecting a plurality of battery cells in series, in parallel, or in series-parallel, and a plurality of battery modules are connected in series, in parallel, or in series-parallel to form a whole and accommodated in the case 10.

Wherein, each battery cell can be a secondary battery or a primary battery; but not limited thereto, a lithium sulfur battery cell, a sodium ion battery cell, or a magnesium ion battery cell may also be used. The battery cell 20 may also be cylindrical, flat, rectangular parallelepiped, or other shapes.

In some embodiments, the battery cell 20 may be a plurality of battery cells 20, and a plurality of battery cells 20 are connected in series or in parallel or in series-parallel to form a battery module. A plurality of battery modules are connected in series or in parallel or in series-parallel to form a whole, and are accommodated in the case 10.

In some embodiments, as shown in fig. 3, an exploded structure diagram of the battery cell 20 is provided in some embodiments of the present application. The battery cell 20 refers to the smallest unit constituting the battery. The cell 20 includes an end cap assembly 21, a housing 22, an electrode assembly 23, and other functional components.

The end cap assembly 21 refers to a member that covers an opening of the case 22 to insulate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap assembly 21 may be adapted to the shape of the housing 22 to fit the housing 22. Alternatively, the end cap assembly 21 may be made of a material (e.g., an aluminum alloy) having a certain hardness and strength, so that the end cap assembly 21 is not easily deformed when being impacted, and the battery cell 20 may have a higher structural strength, and the safety performance may be improved.

In some embodiments of the present application, functional components such as the electrode terminals 25 may be provided on the end cap assembly 21. The electrode terminals 25 may be used to electrically connect with the electrode assembly 23 for outputting or inputting electric energy of the battery cells 20.

In some embodiments of the present application, a pressure relief mechanism 24 for relieving the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value may be further disposed on the end cap assembly 21. The material of the end cap assembly 21 may also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in this embodiment. In some embodiments, insulation may also be provided on the inside of the end cap assembly 21, which may be used to isolate the electrical connection components within the housing 22 from the end cap assembly 21 to reduce the risk of short circuits. Illustratively, the insulator may be a plastic, rubber, or organic material film, or the like.

The case 22 is an assembly for mating with the end cap assembly 21 to form the internal environment of the battery cell 20. Wherein the resulting internal environment may be used to house the electrode assembly 23, electrolyte, and other components. The housing 22 and the end cap assembly 21 may be separate components, and an opening may be provided in the housing 22, and the opening may be covered by the end cap assembly 21 to form the internal environment of the battery cell 20. Without limitation, the end cap assembly 21 and the housing 22 may be integrated, and specifically, the end cap assembly 21 and the housing 22 may form a common connecting surface before other components are inserted into the housing, and when it is required to enclose the inside of the housing 22, the end cap assembly 21 covers the housing 22. The housing 22 may be a variety of shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc.

Specifically, the shape of the case 22 may be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 22 may be various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not limited in the embodiments of the present invention.

The electrode assembly 23 is a part in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 23 may be contained within the case 22. The electrode assembly 23 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is generally disposed between the positive electrode sheet and the negative electrode sheet. The portions of the positive and negative electrode tabs having the active material constitute the body portion of the electrode assembly 23, and the portions of the positive and negative electrode tabs having no active material each constitute a tab. The positive electrode tab and the negative electrode tab may be located at one end of the main body portion together or at both ends of the main body portion, respectively. 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 with the electrode terminals to form a current loop.

Referring to fig. 4 to 9 in combination, fig. 4 is a schematic structural diagram of an end cap assembly 21 according to some embodiments of the present application; FIG. 5 is a schematic diagram of the structure of the limiting portion 2104 of some embodiments of the present application; FIG. 6 is a schematic diagram of a structure of a protection layer 2114 in accordance with some embodiments of the present application; FIG. 7 is a schematic diagram of a structure of a protective layer 2114 in accordance with further embodiments of the present application; FIG. 8 is a schematic perspective view of a protective layer 2114 according to some embodiments of the present application; fig. 9 is a schematic diagram of a structure of a protection layer 2114 according to further embodiments of the present application.

As shown in fig. 4, an end cap assembly 21 of a battery cell 20 includes an end cap 2101 and an insulating layer 2102. The end cap 2101 includes a body 2103 and a limiting portion 2104, the limiting portion 2104 protrudes from a surface of the body 2103 facing the electrode assembly 23 of the battery cell 20. An insulating layer 2102 is provided on the side of the end cap 2101 facing the electrode assembly 23, and the insulating layer 2102 covers the body 2103 and the stopper 2104.

The body 2103 covers the opening of the casing 22, and the body 2103 and the casing 22 jointly enclose to form a containing cavity for containing the electrode assembly 23 so as to protect the electrode assembly 23. The stopper 2104 protrudes in the thickness direction of the body 2103, and the stopper 2104 is a member for restricting the displacement of the electrode assembly 23 and may be made of a material having a certain strength. In addition, the limiting part 2104 is fixedly connected with the end cover 2101, so that the situation that the limiting part 2104 falls off from the end cover 2101 in the operation process of the battery 100, the limiting part 2104 moves in the shell 22 of the battery cell 20, the electrode assembly 23 is damaged, and the efficiency of the electrode assembly 23 is reduced is avoided. The body 2103 may have a flat structure, which ensures the convenience of mounting the body 2103 to the housing 22 and the stability of connection.

Insulating layer 2102 serves to insulate between end cap 2101 and electrode assembly 23 to prevent a short circuit between electrode assembly 23 and case 22. The insulating layer 2102 may be made of an insulating material. Without limitation, the insulating layer 2102 may be formed by doping an insulating material in a colloid and coating the colloid on the end cap 2101 to form the insulating layer 2102, for example, a nano barium salt and a composite resin material may be compounded to form the insulating layer 2102.

It will be appreciated that since the lower plastic is eliminated, the insulating layer 2102 should completely cover the body 2103 and the retention element 2104 in order to prevent short circuits caused by contact of the electrode assembly 23 with the end cap 2101. The surface area of the insulating layer 2102 may be slightly larger than the plate surface of the body 2103 to accommodate the shape of the stopper 2104 protruding in the thickness direction of the body 2103. When the insulating layer 2102 is connected to the body 2103, a bending region can be formed at the connection position of the limiting portion 2104 and the body 2103 to adapt to the shape of the end cap 2101.

In the above technical solution, by providing the limiting portion 2104 on the end cap 2101, the displacement of the electrode assembly 23 toward the end cap 2101 can be limited, and the efficiency and stability of the operation of the electrode assembly 23 can be ensured. And the insulating layer 2102 is arranged to insulate the end cap 2101 from the electrode assembly 23, so that the electric energy leakage of the electrode assembly 23 is reduced, and the safety of the battery cell 20 is ensured. The structure eliminates the lower plastic on the original end cap assembly 21, thereby increasing the space inside the battery cell 20 for accommodating the electrode assembly 23, effectively reducing the thickness of the end cap assembly 21, and realizing the limitation of the electrode assembly 23 by arranging the limiting part 2104. Therefore, the technical scheme can improve the energy density of the battery cell 20 and ensure the insulation and stability of the end cover assembly 21.

In some embodiments of the present application, the body 2103 and the limiting portion 2104 are integrally formed. Alternatively, the body 2103 and the limiting portion 2104 may be manufactured using the same material and using the same process. Specifically, the integral molding process refers to manufacturing the same material in the same preparation process. For example, the material may be melted at a high temperature and then cast into a mold having a predetermined shape. Illustratively, the body 2103 and the limiting portion 2104 may be made of a metal material. The above materials can be arranged according to specific structures, and are not limited herein. The end cover 2101 manufactured by integral molding simplifies the production process steps and improves the production efficiency.

In some embodiments, the body 2103 and the limiting portion 2104 can be separately manufactured and molded and then connected. The connection can be by welding, riveting or gluing. Optionally, the body 2103 and the limiting portion 2104 can be detachably connected by screws.

In some embodiments, the body 2103 and the limiting portion 2104 can be made of different materials, for example, the limiting portion 2104 can be made of rubber or organic material, and the body 2103 can be made of metal material. Specifically, the end cap 2101 may be manufactured by casting and molding the limiting portion 2104 and the body 2103, respectively, and then bonding the two.

In some embodiments of the present application, please refer to fig. 4 and 5 in combination, the end cap 2101 has a pressure relief hole 2108, and the position-limiting portion 2104 includes a first position-limiting portion 2109 and a second position-limiting portion 2110 which are disposed at two sides of the pressure relief hole 2108.

The first and second stoppers 2109 and 2110 may have a strip-shaped or plate-shaped structure, and the first and second stoppers 2109 and 2110 may have the same structure and have a certain strength, so as to limit the displacement of the electrode assembly 23 in the direction toward the end cap assembly 21.

In the above technical solution, the first limiting part 2109 and the second limiting part 2110 are provided to improve the stability of limiting the electrode assembly 23, and are disposed at two sides of the pressure relief hole 2108, so as to ensure the balance of the end cap 2101 in limiting the electrode assembly 23.

In some embodiments of the present application, the first limiting portion 2109 and the second limiting portion 2110 extend toward the electrode assembly 23 and abut against the electrode assembly 23. The above-described structure effectively restricts the displacement of the electrode assembly 23 and prevents the electrode assembly 23 from moving toward the end cap assembly 21.

In some embodiments of the present application, as shown in fig. 5, the weight-reduced portion 2111 is provided on the first limit portion 2109 and/or the second limit portion 2110. The weight-reducing portion 2111 may be a weight-reducing cavity or a weight-reducing hole that is concavely formed along the surface of the electrode assembly 23 toward the end cap assembly 21.

In the above embodiment, the weight reduction portion 2111 is provided, so that the displacement limiting function of the first limiting portion 2109 and the second limiting portion 2110 on the electrode assembly 23 can be ensured while the weight of the end cap 2101 is reduced, the energy density of the battery cell 20 is improved, and the material cost is reduced.

In some embodiments of the present application, the limiter portion 2104 further includes a third limiter portion 2112 and a fourth limiter portion 2113. The third limiting portion 2112 is disposed on a side of the first limiting portion 2109 away from the second limiting portion 2110. The fourth limiting portion 2113 is disposed on a side of the second limiting portion 2110 departing from the first limiting portion 2109.

In the above structure, the third limiting portion 2112 and the fourth limiting portion 2113 increase the limiting point between the end cap assembly 21 and the electrode assembly 23, limit multiple positions of the electrode assembly 23, and ensure the position stability of the electrode assembly 23.

In alternative embodiments, a third restraint portion 2112 is provided on one side of the end cap assembly 21 adjacent the edge, and a fourth restraint portion 2113 is provided on the other side of the end cap assembly 21 adjacent the edge. The third limiting portion 2112 and the fourth limiting portion 2113 are parallel to the first limiting portion 2109. With the above structure, the displacement of the electrode assembly 23 can be restricted at the edge of the end cap 2101, and the restricting action of the electrode assembly 23 by the restricting portion 2104 can be enhanced.

In some alternative embodiments, the first locating portion 2109, the second locating portion 2110, the third locating portion 2112 and the fourth locating portion 2113 are identical in structure. By means of the technical scheme, the production process of the limiting portion 2104 can be simplified, and the production efficiency of the end cover assembly 21 is improved.

In some embodiments of the present application, the end cap assembly 21 further includes a protective layer 2114, the protective layer 2114 being provided on the side of the insulating layer 2102 facing away from the end cap 2101. The protective layer 2114 serves to protect the electrode assembly 23 during the installation of the battery cell 20. For example, the protective layer 2114 may be Mylar (a flat, wide film layer of polyester resin type material that has a high degree of hardness). Illustratively, the protective layer 2114 may be made of PP (polypropylene) or PET (polyethylene terephthalate). By providing the protective layer 2114 on the insulating layer 2102, the end cap 2101 can be isolated from the electrode assembly 23, and the electrode assembly 23 can be protected.

In some embodiments of the present application, as shown in FIGS. 4-6, the end cap assembly 21 further includes a first electrode terminal 2105 and a second electrode terminal 2106 mounted to the end cap 2101, and the end cap 2101 further includes a pour port 2107. The protection layer 2114 includes a connection portion 2115, the connection portion 2115 is used for connecting the insulation layer 2102, and the connection portion 2115 is provided with a first through hole 2116, a second through hole 2117, a third through hole 2118, and a fourth through hole 2119 respectively corresponding to the first electrode terminal 2105, the liquid injection hole 2107, the pressure release hole 2108, and the second electrode terminal 2106 of the end cap 2101. The suitability of the protective layer 2114 and the end cover 2101 is improved by arranging a plurality of through holes, so that the normal function of the end cover 2101 is ensured.

In some embodiments of the present application, the connection portion 2115 includes a first receiving groove 2121 and a second receiving groove 2122 which are recessed toward the electrode assembly 23 along a surface of the connection portion 2115 adjacent to the insulating layer 2102 and protrude from the connection portion 2115, and the first receiving groove 2121 and the second receiving groove 2122 respectively receive and are connected to the first limiting portion 2109 and the second limiting portion 2110.

In the above embodiment, the first receiving groove 2121 and the second receiving groove 2122 are configured to match the first position-limiting portion 2109 and the second position-limiting portion 2110, so as to prevent the first position-limiting portion 2109 and the second position-limiting portion 2110 from compressing the protection layer 2114 to cause deformation, and ensure that the thickness of the protection layer 2114 at the first position-limiting portion 2109 and the second position-limiting portion 2110 is unchanged.

In some embodiments of the present application, the connection portion 2115 further includes third and fourth receiving grooves 2125 and 2126 protruding toward the electrode assembly 23, and the third and fourth receiving grooves 2125 and 2126 receive and are coupled to the third and fourth retaining portions 2112 and 2113, respectively.

The third receiving groove 2125 and the fourth receiving groove 2126 in the above technical solution can match the structures of the third limiting portion 2112 and the fourth limiting portion 2113, so as to avoid the third limiting portion 2112 and the fourth limiting portion 2113 from deforming due to extrusion of the protection layer 2114, and ensure that the thickness of each portion of the protection layer 2114 is unchanged.

In some embodiments of the present application, the connection portion 2115 further includes four side portions 2120, at least one of the four side portions 2120 is connected to the connection portion 2115, and the side portion 2120 serves to protect the electrode assembly 23. Fig. 8 is a schematic view of an installation perspective structure of the protection layer 2114. During assembly of the battery cell 20, the side walls of the electrode assembly 23 may be surrounded using the four side portions 2120 of the protective layer 2114, and then the electrode assembly 23 may be assembled into the receiving cavity of the case 22. The above structure can prevent the case 22 from scraping the electrode assembly 23 during the mounting process, and protect the electrode assembly 23.

In the above-described embodiment, the electrode assembly 23 can be effectively protected by providing the four side portions 2120. Also, the four side portions 2120 are connected to the connection portions 2115, the connection portions 2115 may be connected to the cap assembly 21 in advance so that the four side portions 2120 are also connected to the cap assembly 21, and thereafter, the side portions 2120 may surround the electrode assembly 23. After the electrode assembly 23 is mounted to the case 22, the end cap assembly 21 is also covered on the case 22, and the above process can effectively improve the efficiency and safety of mounting the end cap assembly 21.

In some embodiments, as shown in fig. 8 and 9, the protective layer 2114 further includes a base 2127 coupled to the side 2120. The bottom 2127 covers the bottom of the electrode assembly 23 for protecting the bottom of the electrode assembly 23.

In some embodiments of the present application, the connecting portion 2115, the plurality of side portions 2120, and the bottom portion 2127 are a unitary, molded structure. The connecting portion 2115, the side portions 2120, and the bottom portion 2127 may be produced using the same material using the same process flow. Therefore, the production efficiency of the protection layer 2114 can be effectively improved by the above technical scheme.

In some embodiments of the present application, the connection portion 2115 and the insulating layer 2102 are adhesively connected. The connection portion 2115 may be bonded using glue or adhesive tape. The connecting portion 2115 or the insulating layer 2102 itself may have a certain adhesive property, and may be directly adhered to each other, for example, the insulating layer 2102 having the adhesive property may be formed by doping an insulating material in glue. The above structure can effectively improve the convenience of production of the protective layer 2114.

In some embodiments of the present application, the thickness D1 of the insulating layer 2102 satisfies the relationship, D1 ≦ 55 μm. Illustratively, the thickness D1 of the insulating layer 2102 may be any of 55 μm, 50 μm, 45 μm, 40 μm, 35 μm, and 30 μm. Through setting up reasonable insulating layer 2102 thickness, when guaranteeing insulating effect, reduce the volume that insulating layer 2102 occupy, guarantee battery cell 20's energy density.

In some embodiments of the present application, the end cap assembly 21 further comprises a water barrier layer disposed between the insulating layer 2102 and the end cap 2101, and the water barrier layer covers the body 2103 and the limiting portion 2104. Illustratively, the waterproof layer is prepared by mixing at least one material of nano silicon, nano titanium and nano ceramic powder with glue. In the technical scheme, the waterproof layer is arranged to prevent the electrolyte from infiltrating the end cover 2101, so that the service life of the end cover 2101 is prolonged.

In some embodiments of the present application, the waterproof layer is adhesively attached to the insulating layer 2102. The waterproof layer is bonded with the insulating layer 2102, so that the installation efficiency of the waterproof layer is improved.

In some embodiments of the present application, the thickness D1 of the insulating layer 2102 and the thickness D2 of the water repellent layer satisfy the relationship D1+ D2 ≦ 70 μm. Illustratively, D1+ D2 may be any of 70 μm, 65 μm, 60 μm, 55 μm, 50 μm, 45 μm, 40 μm, and 35 μm.

Further, the thickness D2 of the waterproof layer may be set as: d2 is more than or equal to 5 mu m and less than or equal to 15 mu m. The thickness of the water-repellent layer may be any one of 5 μm, 7 μm, 10 μm, 12 μm, and 15 μm. Through the thickness that sets up reasonable insulating layer 2102 and waterproof layer, when satisfying insulation and water-proof effects, reduce insulating layer 2102 and the whole thickness of waterproof layer, guarantee battery monomer 20's energy density.

According to some embodiments of the present application, there is also provided a battery cell 20 including a case 22, the end cap assembly 21 of the above embodiments, and an electrode assembly 23. The housing 22 has an opening and the end cap assembly 21 is used to cover the opening. An electrode assembly 23 is disposed within the case 22. In the above structure, because the end cap assembly 21 in any of the above embodiments is provided, the displacement of the electrode assembly 23 toward the end cap 2101 can be limited, and the operation efficiency and stability of the electrode assembly 23 are ensured, the structure described above eliminates the lower plastic on the original end cap assembly 21, effectively reduces the thickness of the end cap assembly 21 itself, and the limit of the electrode assembly 23 is realized by providing the limit portion 2104. In addition, the insulating layer 2102 is arranged to insulate the end cap 2101 from the electrode assembly 23, so that the electric energy leakage of the electrode assembly 23 is reduced, and the safety of the battery cell 20 is ensured.

In some embodiments of the present application, four sides 2120 of the protective layer 2114 are disposed between the case 22 and the electrode assembly 23 and around the sides of the electrode assembly 23, respectively. By arranging the four side parts 2120, the side walls of the electrode assembly 23 are protected, and safety of the electrode assembly 23 in the installation process is effectively improved.

In some embodiments of the present application, the bottom portion 2127 of the protective layer 2114 is disposed opposite the connecting portion 2115, and the bottom portion 2127 is connected to the plurality of side portions 2120, respectively. By arranging the bottom 2127, the bottom 2127 of the electrode assembly 23 is effectively protected, so that the surface of the electrode assembly 23 is completely covered, and the safety of the electrode assembly 23 is further improved.

According to some embodiments of the present application, the present application also provides a battery 100 including the battery cell 20 of the above-described embodiments.

According to some embodiments of the present application, there is also provided an electric device, as shown in fig. 1, the electric device includes the battery 100 according to any of the above schemes, please refer to fig. 2, which is an exploded structural schematic diagram of the battery 100 according to some embodiments of the present application. The battery 100 includes a case 10 and a battery cell 20, and the battery cell 20 is accommodated in the case 10. The case 10 is used to provide a receiving space for the battery cells 20. The battery cell 20 includes an end cap assembly 21 of any of the above aspects. The battery 100 is used to supply power to the electric devices. The powered device may be any of the aforementioned devices or systems that employ battery 100.

It can be understood that, when the electric device uses the battery 100 to provide electric energy, the battery 100 can also ensure the insulation and stability of the end cap assembly 21 while achieving the purpose of increasing the energy density of the battery cell 20.

Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present disclosure, and the present disclosure should be construed as being covered by the claims and the specification. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims (20)

1. An end cap assembly for a battery cell, comprising:

the end cover comprises a body and a limiting part, wherein the limiting part protrudes out of the surface of the body facing the electrode assembly of the battery cell;

the insulating layer is arranged on one side, facing the electrode assembly, of the end cover, and the insulating layer covers the body and the limiting part.

2. The end cap assembly of claim 1, wherein the body and the restraint portion are integrally formed.

3. An end cap assembly according to claim 1 or 2, wherein the end cap is provided with a pressure relief hole, and the limiting portion comprises a first limiting portion and a second limiting portion arranged on two sides of the pressure relief hole.

4. An end cap assembly according to claim 3, wherein a weight-reducing portion is provided on the first and/or second retention portions.

5. The end cap assembly of claim 3, further comprising a protective layer disposed on a side of the insulating layer facing away from the end cap.

6. The end cap assembly of claim 5, further comprising a first electrode terminal and a second electrode terminal mounted on the end cap, wherein the end cap further comprises a liquid injection hole, the protective layer comprises a connecting portion for connecting the insulating layer, and the connecting portion is provided with a first through hole, a second through hole, a third through hole and a fourth through hole respectively corresponding to the first electrode terminal, the liquid injection hole, the pressure relief hole and the second electrode terminal of the end cap.

7. The end cap assembly according to claim 6, wherein the connection part includes first and second receiving grooves recessed toward the electrode assembly along a surface of the connection part adjacent to the insulating layer and protruding from the connection part, the first and second receiving grooves receiving and connecting to the first and second position limiting parts, respectively.

8. The end cap assembly of claim 7, wherein the connection portion has four sides, and the protective layer further comprises four side portions, at least one of the four side portions being connected to the connection portion, the side portions protecting the electrode assembly.

9. The end cap assembly of claim 8, wherein the protective layer further comprises a bottom portion connected to the side portion.

10. The end cap assembly of claim 9, wherein the connecting portion, the plurality of side portions, and the bottom portion are an integrally formed structure.

11. An end cap assembly according to any one of claims 6 to 9, wherein the connecting portion and the insulating layer are adhesively connected.

12. The end cap assembly of claim 11, wherein the insulating layer has a thickness D1 that satisfies the relationship D1 ≦ 55 μm.

13. An end cap assembly according to claim 11, further comprising a waterproof layer disposed between the insulating layer and the end cap, the waterproof layer covering the body and the limiting portion.

14. An end cap assembly according to claim 13 wherein the water barrier is adhesively attached to the insulating layer.

15. An end cap assembly according to claim 13 or 14 wherein the thickness of the insulating layer, D1, and the thickness of the water barrier, D2, satisfy the relationship D1+ D2 ≤ 70 μm.

16. A battery cell, comprising:

a housing having an opening;

the end cap assembly of any one of claims 1 to 15 for capping

The opening;

an electrode assembly disposed within the housing.

17. A battery cell, comprising:

a housing having an opening;

the end cap assembly of claim 9 or 10 for capping the opening;

an electrode assembly disposed within the case,

wherein the four side portions of the protective layer are disposed between the case and the electrode assembly and respectively surround the sides of the electrode assembly.

18. The battery cell as recited in claim 17, wherein the bottom portion is disposed opposite to the connecting portion, and the bottom portion is connected to the plurality of side portions, respectively.

19. A battery comprising a cell according to any one of claims 16 to 18.

20. An electrical consumer, characterized in that the consumer comprises a battery according to claim 19 for providing electrical energy.

Images