CN221150247U

CN221150247U - Battery monomer, battery and electric equipment

Info

Publication number: CN221150247U
Application number: CN202420630016.XU
Authority: CN
Inventors: 周健; 谢勇锋; 王利钦; 李全坤
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2024-03-29
Filing date: 2024-03-29
Publication date: 2024-06-14
Anticipated expiration: 2034-03-29

Abstract

The application discloses a battery monomer, a battery and electric equipment. The battery cell includes a case, an electrode terminal, an electrode assembly, an adapter, and a seal. The housing includes a first wall provided with a terminal hole. At least a portion of the electrode terminal is located in the terminal hole. The electrode assembly is accommodated in the case. The adapter is used for electrically connecting the electrode lug and the electrode terminal of the electrode assembly. Wherein the battery cell further comprises a seal, the adapter being configured to compress the seal against the first wall and the electrode terminal. The technical scheme provided by the application can improve the reliability of the battery.

Description

Battery monomer, battery and electric equipment

Technical Field

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

Background

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

In addition to improving the performance of batteries, the reliability of batteries is also a problem to be considered in the development of battery technology.

Therefore, how to improve the reliability of the battery is a problem to be solved in the battery technology.

Disclosure of utility model

In view of the above problems, embodiments of the present application provide a battery unit, a battery, and an electric device, which can improve reliability of the battery.

In a first aspect, embodiments of the present application provide a battery cell including a housing, an electrode terminal, an electrode assembly, an adapter, and a seal. The housing includes a first wall provided with a terminal hole. At least a portion of the electrode terminal is located in the terminal hole. The electrode assembly is accommodated in the case. The adapter is used for electrically connecting the electrode lug and the electrode terminal of the electrode assembly. Wherein the battery cell further comprises a seal, the adapter being configured to compress the seal against the first wall and the electrode terminal.

In an embodiment of the present application, the adapter is configured to press the sealing member against the first wall and the electrode terminal. In this way, the adapter can compress the seal in cooperation with the electrode terminal, and the adapter can compress the seal in cooperation with the first wall. To fill the gap between the adapter and the electrode terminal, and to fill the gap between the adapter and the first wall, to reduce the risk of electrolyte leakage in the battery cell. Particularly when the adapter piece is simultaneously matched with the first wall and the electrode terminal to compress the sealing member, the gap between the adapter piece and the first wall and the gap between the adapter piece and the electrode terminal can be simultaneously filled, so that the risk of electrolyte leakage in the battery cell is further reduced, and the battery cell is beneficial to improving the reliability of the battery.

In some embodiments, the adapter is provided with a first through hole, and the electrode terminal is inserted through the first through hole and riveted with the adapter.

In the above scheme, the electrode terminal is arranged through the first through hole and riveted with the adapter. On the one hand, the adapter is electrically connected with the electrode terminal, and on the other hand, during the riveting process of the electrode terminal and the adapter, the assembly force generated by the riveting can enable the adapter and the electrode terminal to press the sealing member, so that the sealing member can be self-adaptively assembled during the riveting process of the electrode terminal and the adapter.

In some embodiments, the seal includes a first seal portion. The first sealing part is located between the adapter and the electrode terminal in the thickness direction of the first wall.

In the above aspect, the first sealing portion is located between the adapter and the electrode terminal in the thickness direction of the first wall. So that the adapter can be engaged with the electrode terminal to clamp opposite sides of the first sealing part in the thickness direction of the first wall, thereby filling a gap between the adapter and the electrode terminal, thereby reducing the risk of leakage of electrolyte in the battery cell and improving the reliability of the battery.

In some embodiments, the electrode terminal includes a body, a connection portion, and a stopper portion. The connecting portion is located in the first through hole, and the main part sets up in the one end that the connecting portion kept away from the electrode assembly, and limit part sets up in the one end that the connecting portion is close to the electrode assembly. Along the radial direction of the electrode terminal, the main body and the limiting part are both protruded from the outer peripheral surface of the connecting part. Along the thickness direction of the first wall, a part of the adapter is positioned between the limiting part and the main body.

In the above-described aspect, a portion of the adapter is located between the stopper and the main body in the thickness direction of the first wall. So that the electrode terminal can play a structural limit to the adapter, thereby limiting the movement of the adapter relative to the electrode terminal in the thickness direction of the first wall, improving the reliability of the adapter and the electrode terminal matched with and pressed on the sealing member, reducing the risk of electrolyte leakage in the battery cell and improving the reliability of the battery.

In some embodiments, the body includes a first portion and a second portion. The first portion, the second portion and the connecting portion are arranged in this order in the thickness direction of the first wall. The radial dimension of the first portion is greater than the radial dimension of the second portion to form a stepped surface on the outer peripheral surface of the body. The first sealing part is positioned between the adapter and the step surface along the thickness direction of the first wall.

In the above aspect, the first sealing portion is located between the adapter and the step surface in the thickness direction of the first wall. The arrangement of the step surface enables the contact part of the first sealing part and the electrode terminal to be in surface contact, the contact area of the first sealing part and the electrode terminal is increased, the risk of electrolyte leakage in the battery cell is reduced, and the reliability of the battery is improved.

In some embodiments, the seal includes a second seal portion. The second sealing part is positioned between the adapter and the first wall along the thickness direction of the first wall.

In the above-described aspect, the second sealing portion is located between the adapter and the first wall in the thickness direction of the first wall. So that the adaptor can be matched with the first wall to clamp two opposite sides of the second sealing part in the thickness direction of the first wall, and then the gap between the adaptor and the first wall is filled, thereby reducing the risk of electrolyte leakage in the battery cell and improving the reliability of the battery.

In some embodiments, the battery cell further includes a first insulator, at least a portion of which is located between the first wall and the adapter along a thickness direction of the first wall.

In the above aspect, at least a portion of the first insulating member is located between the first wall and the adapter along the thickness direction of the first wall. When the switching piece moves along the thickness direction of the first wall, the switching piece is limited to be abutted against the first wall, so that the risk of internal short circuit of the battery cell is reduced, and the reliability of the battery is improved.

In some embodiments, the first insulating member has a second through hole for passing the electrode terminal therethrough. The second sealing part is abutted with the hole wall of the second through hole along the radial direction of the electrode terminal.

In the above aspect, the second sealing portion abuts against the hole wall of the second through hole in the radial direction of the electrode terminal. On the one hand, the second sealing part is abutted with the hole wall of the second through hole so as to fill the gap between the electrode terminal and the hole wall of the second through hole, thereby reducing the risk of electrolyte leakage in the battery cell and improving the reliability of the battery; on the other hand, the second sealing part is positioned in the second through hole so as to limit the contact of the part of the switching piece positioned in the second through hole with the first wall when the switching piece moves along the thickness direction of the first wall, thereby reducing the risk of internal short circuit of the battery cell and improving the reliability of the battery.

In some embodiments, the seal includes a third seal portion. The third sealing part is located between the electrode terminal and the wall of the terminal hole in the radial direction of the electrode terminal.

In the above aspect, the third sealing portion is located between the electrode terminal and the wall of the terminal hole in the radial direction of the electrode terminal. On the one hand, the electrode terminal can be through the pore wall cooperation with the terminal hole to press from both sides the interior circumference side and the periphery side of third sealing part in the radial direction of electrode terminal, and then fill the clearance between the pore wall of electrode terminal and terminal hole, thereby reduce the risk that electrolyte in the battery monomer leaked, improved the reliability of battery, on the other hand third sealing part cooperates with the pore wall of terminal hole, can play certain structure spacing effect to electrode terminal, thereby improved the reliability of electrode terminal installation.

In some embodiments, the battery cell further includes a second insulating member for separating the first wall from the electrode terminal.

In the scheme, the second insulating piece is used for separating the first wall and the electrode terminal so as to limit the electrode terminal to be abutted against the first wall, so that the risk of internal short circuit of the battery cell is reduced, and the reliability of the battery is improved.

In some embodiments, the third sealing portion abuts the second insulating member in a thickness direction of the first wall.

In the above aspect, the third sealing portion is in contact with the second insulator in the thickness direction of the first wall. The second insulating piece is used for limiting the third sealing part in the thickness direction of the first wall, so that the third sealing part is limited to move relative to the electrode terminal in the thickness direction of the first wall, the reliability of the third sealing part for filling a gap between the electrode terminal and the hole wall of the terminal hole is further improved, the risk of electrolyte leakage in the battery cell is reduced, and the reliability of the battery is improved.

In some embodiments, the electrode terminal includes a first base body and a second base body, the first base body is disposed through the first through hole and riveted with the adapter, the second base body is connected to a side of the first base body away from the electrode assembly, the first base body and the adapter are made of the same material, and the second base body and the adapter are made of different materials.

In the above scheme, the first base body and the adaptor are the same in material, and the second base body and the adaptor are different in material. The first base body, the adapter and the insulating piece are matched to isolate the electrolyte from the second base body. So as to reduce the risk of reaction caused by the contact of the second matrix with the electrolyte, and improve the reliability of the battery.

In some embodiments, the electrode terminal and the adapter are of different materials. The battery cell also comprises an isolation member, the isolation member is positioned at one end of the electrode terminal, which is close to the electrode assembly, along the thickness direction of the first wall, the outer periphery side of the isolation member is connected with the adapter member, and the isolation member and the adapter member are made of the same material.

In the above scheme, the periphery side of the isolation member is connected with the adaptor, and the isolation member and the adaptor are the same in material. The isolating piece can be matched with the adapter piece to cover one riveted end of the electrode terminal and the adapter piece so as to isolate electrolyte and the electrode terminal. So as to reduce the risk of contact between the electrode terminals and the electrolyte and improve the reliability of the battery.

In some embodiments, the adapter includes an adapter body and a protrusion protruding from a side of the adapter body facing the first wall. The convex part includes roof and perisporium, and the perisporium encloses to locate the roof, and the roof passes through perisporium and adaptor body coupling, and first through-hole sets up in the roof.

In the above aspect, the convex portion protrudes from a side of the adapter body facing the first wall so as to be connected with the electrode terminal. The convex part includes roof and perisporium, and first through-hole sets up in the roof to make roof and electrode terminal be connected, thereby increase the overcurrent area of adaptor and electrode terminal, improved the overcurrent ability between adaptor and the electrode terminal, and then improved single output current intensity of battery, improved the performance of battery.

In some embodiments, the top wall and the peripheral wall define a recess, at least a portion of the insulator is positioned within the recess, and an outer peripheral side of the insulator is connected to an inner peripheral surface of the recess.

In the above aspect, at least a part of the separator is located in the recess, and the outer peripheral side of the separator is connected with the inner peripheral surface of the recess such that the side surface of the separator facing the first wall and the inner peripheral surface of the recess enclose an accommodation space for accommodating the portion of the electrode terminal for caulking to isolate the electrolyte from the electrode terminal. So as to reduce the risk of contact between the electrode terminals and the electrolyte and improve the reliability of the battery.

In some embodiments, the housing includes a shell having an opening and a cover plate closing the opening. The first wall is a cover plate, or the first wall is a wall part of the shell opposite to the cover plate.

In the above scheme, the design of the opening facilitates the accommodation of the electrode assembly in the case through the opening, and the cover plate covers the opening to form a closed space for accommodating the electrode assembly.

In a second aspect, an embodiment of the present application provides a battery, including the battery cell provided in the embodiment of the first aspect.

In a third aspect, an embodiment of the present application provides an electrical device, including a battery provided by an embodiment of the second aspect.

Drawings

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

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

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

Fig. 3 is an exploded view of a battery cell according to some embodiments of the present application;

fig. 4 is an exploded view of a portion of a structure of a battery cell according to some embodiments of the present application;

fig. 5 is a cross-sectional view illustrating a partial structure of a battery cell according to some embodiments of the present application;

FIG. 6 is an enlarged view of portion A of FIG. 4;

Fig. 7 is a cross-sectional view illustrating a partial structure of another battery cell according to some embodiments of the present application;

FIG. 8 is an enlarged view of portion B of FIG. 7;

Fig. 9 is a cross-sectional view illustrating a partial structure of a battery cell according to still another embodiment of the present application;

Fig. 10 is a cross-sectional view illustrating a partial structure of yet another battery cell according to some embodiments of the present application;

FIG. 11 is a schematic view of an adapter according to some embodiments of the present application;

FIG. 12 is an exploded view of a housing provided in some embodiments of the application;

fig. 13 is an exploded view of another housing provided in some embodiments of the present application.

Icon: 1000-vehicle;

100-cell; 200-a controller; 300-motor;

10-a box body; 11-a first box; 12-a second box;

20-battery cells; 21-a housing; 211-a first wall; 211A-an inner surface; 211B-a first accommodation portion; 211C-outer surface; 211D-a second accommodation portion; 211E-terminal holes; 212-a housing; 213-cover plate; 22-electrode terminals; 22A-positive electrode terminal; 22B-a negative electrode terminal; 220A-a first substrate; 220B-a second matrix; 221-a main body; 221A-a first part; 221B-a second portion; 221C-step surface; 222-connection; 223-limit part; 23-an electrode assembly; 231-tab; 231A-positive tab; 231B-negative electrode ear; 24-an adapter; 24A-positive electrode adapter; 24B-negative electrode adapter; 241-adaptor body; 242-projecting portions; 242A-top wall; 242B-a peripheral wall; 242C-recesses; 243-a first through hole; 25-seals; 251-a first seal; 252-a second seal; 253—a third seal; 26-a first insulating member; 26A-a second through hole; 261-a first body portion; 262-a first extension; 27-a second insulator; 27A-a third through hole; 271-a second body portion; 272-a second extension; 28-insulation;

X-the thickness direction of the first wall; y-a first direction; z-second direction.

Detailed Description

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

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

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

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

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

In the embodiments of the present application, the same reference numerals denote the same components, and detailed descriptions of the same components are omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are merely illustrative and should not be construed as limiting the application in any way.

The term "plurality" as used herein refers to two or more (including two).

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

The battery cells include, but are not limited to, lithium ion batteries, sodium lithium ion batteries, lithium metal batteries, sodium metal batteries, lithium sulfur batteries, magnesium ion batteries, nickel hydrogen batteries, nickel cadmium batteries, lead storage batteries, and the like.

The battery cell may include a case, an electrode assembly, an electrode terminal, and an adapter.

The case serves to define a sealed space for accommodating the electrode assembly, the electrolyte, and other components.

The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge of the battery cell, active ions (e.g., lithium ions) are inserted and extracted back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, so that the risk of short circuit of the positive electrode and the negative electrode can be reduced, and meanwhile, active ions can pass through the separator.

The electrolyte serves to conduct ions between the positive and negative electrodes. The electrolyte may be liquid, gel or solid. Wherein the liquid electrolyte comprises an electrolyte salt and a solvent.

The electrode assembly may further include a tab, which is a component for conducting current out of the electrode assembly. The tab includes a positive tab and a negative tab. It will be appreciated that the positive electrode terminal is for electrical connection with the positive tab and the negative electrode terminal is for electrical connection with the negative tab.

The case may have a first wall thereon for mounting an electrode terminal for electrical connection with the electrode assembly to output electric power of the battery cell. The electrode terminals may include a positive electrode terminal and a negative electrode terminal.

The adapter is a member for electrically connecting the electrode terminal and the tab.

The battery cell may further include a sealing member, which is a member for sealing the connection of the electrode terminal and the case.

Currently, the application of power batteries is more widespread from the development of market situation. The power battery is not only applied to energy storage power supply systems such as hydraulic power, firepower, wind power and solar power stations, but also widely applied to electric vehicles such as electric bicycles, electric motorcycles, electric automobiles and the like, and various fields such as aerospace and the like. With the continuous expansion of the application field of the power battery, the market demand of the power battery is also continuously expanding.

In the related art, in order to reduce the risk of leakage of the electrolyte from the mounting locations of the electrode terminal and the case, a sealing member is generally interposed between the electrode terminal and the side of the first wall remote from the electrode assembly in the thickness direction of the first wall, so that the sealing member is pressed against the side of the first wall remote from the electrode assembly with the electrode terminal to fill the gap between the first wall and the electrode terminal as much as possible while the electrode terminal is mounted on the exterior of the case by caulking. However, in the related art, the inner wall of the housing does not have a corresponding sealing means.

In view of this, embodiments of the present application provide a battery cell including a case, an electrode terminal, an electrode assembly, an adapter, and a seal. The housing includes a first wall provided with a terminal hole. At least a portion of the electrode terminal is located in the terminal hole. The electrode assembly is accommodated in the case. The adapter is used for electrically connecting the electrode lug and the electrode terminal of the electrode assembly. Wherein the battery cell further comprises a seal, the adapter being configured to compress the seal against the first wall and/or the electrode terminal.

In the above aspect, the adapter is configured to press the sealing member against the first wall and/or the electrode terminal. In this way, the adapter can compress the seal in cooperation with the electrode terminal, and/or the adapter can compress the seal in cooperation with the first wall. Thereby deforming the sealing member to fill the gap between the adapter member and the electrode terminal, and/or to fill the gap between the adapter member and the first wall, to reduce the risk of electrolyte leakage in the battery cell. Particularly when the adapter piece is simultaneously matched with the first wall and the electrode terminal to compress the sealing member, the gap between the adapter piece and the first wall and the gap between the adapter piece and the electrode terminal can be simultaneously filled, so that the risk of electrolyte leakage in the battery cell is further reduced, and the battery cell is beneficial to improving the reliability of the battery.

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

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

Referring to fig. 1, fig. 1 is a schematic structural diagram of a vehicle 1000 according to some embodiments of the application. The vehicle 1000 may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or a range-extended vehicle. The battery 100 is provided in the interior of the vehicle 1000, and the battery 100 may be provided at the bottom or the head or the tail of the vehicle 1000. The battery 100 may be used for power supply of the vehicle 1000, for example, the battery 100 may be used as an operating power source of the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, the controller 200 being configured to control the battery 100 to power the motor 300, for example, for operating power requirements during start-up, navigation, and travel of the vehicle 1000.

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

Referring to fig. 2 and further referring to fig. 3, fig. 2 is an exploded view of the battery 100 according to some embodiments of the present application, and fig. 3 is a schematic view of a plurality of battery cells 20 according to some embodiments of the present application connected by a bus bar 30. The battery 100 may include 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 cavity for the battery cell 20, and the case 10 may have various structures. In some embodiments, the case 10 may include a first case 11 and a second case 12, the first case 11 and the second case 12 being covered with each other, the first case 11 and the second case 12 together defining a receiving chamber for receiving the battery cell 20. The second box body 12 may have a hollow structure with an opening at one end, the first box body 11 may have a plate-shaped structure, and the first box body 11 covers the opening side of the second box body 12, so that the first box body 11 and the second box body 12 define a containing cavity together; the first case 11 and the second case 12 may be hollow structures each having one side open, and the open side of the first case 11 may be closed to the open side of the second case 12. Of course, the connection between the first case 11 and the second case 12 may be sealed by a sealing member (not shown), which may be a gasket, sealant, or the like.

Of course, the case 10 formed by the first case 11 and the second case 12 may be various shapes, such as a cylinder, a rectangular parallelepiped, etc.

Alternatively, the first case 11 and the second case 12 may be made of a material having a certain hardness and strength (e.g., aluminum alloy), so that the case 10 is not easily deformed when being impacted by extrusion, and the battery cell 20 can have a higher structural strength, which is advantageous in reducing the damage to the battery 100 caused by the impact of external force.

In the battery 100, the battery cells 20 may be one or a plurality of. If there are multiple battery cells 20, the multiple battery cells 20 may be connected in series or parallel or a series-parallel connection, where a series-parallel connection refers to that there are both series connection and parallel connection among the multiple battery cells 20. The plurality of battery cells 20 can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 10; of course, a plurality of battery cells 20 may be connected in series or parallel or series-parallel to form a battery module, and then connected in series or parallel or series-parallel to form a whole and be accommodated in the case 10. The battery cell 20 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped, or other shapes, etc. Fig. 2 exemplarily shows a case where the battery cell 20 has a rectangular parallelepiped shape.

Some embodiments of the present application provide a battery cell 20, refer to fig. 3, and refer to fig. 4, in which fig. 3 is an exploded view of the battery cell 20 according to some embodiments of the present application, and fig. 4 is an exploded view of a part of the structure of the battery cell 20 according to some embodiments of the present application. The battery cell 20 includes a case 21, an electrode terminal 22, an electrode assembly 23, an adapter 24, and a seal 25. The housing 21 includes a first wall 211, and the first wall 211 is provided with a terminal hole 211E. At least a portion of the electrode terminal 22 is located within the terminal hole 211E. The electrode assembly 23 is accommodated in the case 21. The adapter 24 is used to electrically connect the tab 231 of the electrode assembly 23 and the electrode terminal 22. Wherein the battery cell 20 further includes a sealing member 25, and the adapter member 24 is configured to compress the sealing member 25 against the first wall 211 and the electrode terminal 22.

The case 21 refers to a member for defining a sealed space for accommodating the electrode assembly 23 and other components.

In some embodiments, the housing 21 is used to encapsulate the electrode assembly 23, the adapter 24, and the electrolyte, among other components. The shell 21 may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), an aluminum-plastic film, or the like.

As examples, the battery cell 20 may be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or other shaped battery cell, including a square-case battery cell, a blade-shaped battery cell, a polygonal-prismatic battery cell, such as a hexagonal-prismatic battery cell, or the like. Fig. 3 exemplarily shows a case in which the battery cell has a rectangular parallelepiped shape.

The first wall 211 is a side wall of the case 21 for disposing the electrode terminal 22.

The terminal hole 211E is a through hole penetrating the first wall 211 in the thickness direction X of the first wall 211, and the terminal hole 211E is used for the electrode terminal 22 to pass through so that a portion of the electrode terminal 22 is located inside the case 21.

The electrode terminals 22 are members for electrically connecting with the electrode assembly 23 to output electric power of the battery cells 20.

The electrode assembly 23 includes a positive electrode (not shown), a negative electrode (not shown), and a separator (not shown).

Alternatively, the electrode assembly 23 may be a wound structure. A positive electrode sheet (not shown) and a negative electrode sheet (not shown) are wound into a winding structure; or the electrode assembly 23 may be a laminated structure formed by a positive electrode sheet (not shown), a separator (not shown), and a negative electrode sheet (not shown) through a laminated arrangement, and embodiments of the present application are not limited.

The tab 231 is a portion of the electrode assembly 23 for conducting current from the wound structure.

The adapter 24 is a member for electrically connecting the electrode terminal 22 and the tab 231.

Illustratively, the electrode terminal 22 is mounted to the first wall 211 in an insulating manner, and a portion of the electrode terminal 22 is disposed through the terminal hole 211E, with the portion of the electrode terminal 22 being located within the housing 21 and connected to the adapter 24.

Alternatively, the electrode terminal 22 may be connected to the adapter 24 by welding, or the electrode terminal 22 may be connected to the adapter 24 by caulking.

In some embodiments, the electrode terminal 22 is insulation-mounted to the first wall 211, and the electrode terminal 22 may include a positive electrode terminal 22A and a negative electrode terminal 22B arranged along the first direction Y. The tab 231 includes a positive tab 231A and a negative tab 231B arranged along the first direction Y. The adapter 24 includes a positive electrode adapter 24A and a negative electrode adapter 24B arranged in the first direction Y. The positive electrode terminal 22A and the positive tab 231A are electrically connected by the positive electrode adapter 24A, and the negative electrode terminal 22B and the negative tab 231B are electrically connected by the negative electrode adapter 24B.

The first direction Y may be a length direction of the first wall 211, which may be parallel to the length direction of the battery cell 20, the second direction Z may be a width direction of the first wall 211, which may be parallel to the width direction of the battery cell 20, and the thickness direction X of the first wall 211 may be parallel to the thickness direction of the battery cell 20, and the first direction Y and the second direction Z may be perpendicular to the thickness direction X of the first wall 211.

The sealing member 25 is a member for filling up a gap between the adapter 24 and the first wall 211 and/or for filling up a gap between the adapter 24 and the electrode terminal 22 to prevent leakage of the electrolyte.

The "the adapter 24 is configured to press the sealing member 25 against the first wall 211 and the electrode terminal 22" may be understood as that the sealing member 25 is at least partially located between the adapter 24 and the first wall 211 and the electrode terminal 22 in the thickness direction X of the first wall 211. By "pressed against the first wall 211 and the electrode terminal 22" it is understood that the adapter 24 provides the sealing member 25 with a pressing force directed toward the first wall 211 and the electrode terminal 22 in the thickness direction X of the first wall 211, thereby deforming the sealing member 25 to fill the gap between the adapter 24 and the first wall 211 and the electrode terminal 22.

In the above-described aspects, the adapter 24 is configured to press the sealing member 25 against the first wall 211 and the electrode terminal 22. In this way, the adapter 24 can press the seal 25 in cooperation with the electrode terminal 22, and the adapter 24 can press the seal 25 in cooperation with the first wall 211. To fill the gap between the adapter 24 and the electrode terminal 22 and to fill the gap between the adapter 24 and the first wall 211, to reduce the risk of electrolyte leakage in the battery cell 20. Particularly when the tab is simultaneously engaged with the first wall 211 and the electrode terminal 22 to press the sealing member 25, the gap between the tab 24 and the first wall 211 and the gap between the tab 24 and the electrode terminal 22 can be simultaneously filled, further reducing the risk of leakage of the electrolyte in the battery cell 20, which is advantageous in improving the reliability of the battery 100.

Referring to fig. 4, and further referring to fig. 5, fig. 5 is a cross-sectional view of a portion of a battery cell 20 according to some embodiments of the present application. The adaptor 24 is provided with a first through hole 243, and the electrode terminal 22 is inserted into the first through hole 243 and riveted with the adaptor 24.

The first through hole 243 is a through hole penetrating the adapter 24 in the thickness direction X of the first wall 211.

It is understood that the first through-hole 243 should be coaxial with the terminal hole 211E so that one end of the electrode terminal 22 toward the electrode assembly (not shown in the drawings) passes through the first through-hole 243.

By "the electrode terminal 22 is inserted through the first through-hole 243 and riveted with the adapter 24" it is meant that the radial dimension of the end of the electrode terminal 22 passing through the first through-hole 243 is increased by the action of external force such that the radial dimension of the end of the electrode terminal 22 passing through the first through-hole 243 is greater than the first through-hole 243. And thus the electrode terminal 22 forms a structural limit to the adapter 24 to limit the movement of the adapter 24 relative to the electrode terminal 22 in the thickness direction X of the first wall 211.

In the above-described scheme, on one hand, the adaptor 24 is electrically connected with the electrode terminal 22, and on the other hand, the assembling force generated by the riveting can enable the adaptor 24 and the electrode terminal 22 to press the sealing member during the riveting of the electrode terminal 22 and the adaptor 24, so that the sealing member 25 can be assembled in a self-adapting manner during the riveting of the electrode terminal 22 and the adaptor 24.

Referring to fig. 5, and with further reference to fig. 6, fig. 6 is an enlarged view of portion a of fig. 4, according to some embodiments of the present application. The seal 25 includes a first seal portion 251. The first sealing part 251 is located between the adapter 24 and the electrode terminal 22 in the thickness direction X of the first wall 211.

The first sealing portion 251 is a portion of the sealing member 25 interposed between the electrode terminal 22 and the adapter 24 in the thickness direction X of the first wall 211.

The first sealing part 251 is located between the adapter 24 and the electrode terminal 22, meaning that the assembly force generated by the riveting can cause the adapter 24 and the electrode terminal 22 to press the first sealing part 251 during the riveting of the electrode terminal 22 and the adapter 24, so that the first sealing part 251 is deformed to fill the gap between the adapter 24 and the electrode terminal 22 along the thickness direction X of the first wall 211, i.e., the assembly and positioning of the sealing member 25 are adaptively completed by the first sealing part 251 during the riveting of the electrode terminal 22 and the adapter 24.

In the above-described aspect, the first sealing part 251 is located between the adapter 24 and the electrode terminal 22 in the thickness direction X of the first wall 211. So that the adapter 24 can be fitted with the electrode terminal 22 to clamp opposite sides of the first sealing part 251 in the thickness direction X of the first wall 211, thereby filling the gap between the adapter 24 and the electrode terminal 22, thereby reducing the risk of leakage of electrolyte in the battery cell and improving the reliability of the battery.

Referring to fig. 5, and further referring to fig. 6, according to some embodiments of the present application, the electrode terminal 22 includes a body 221, a connection part 222, and a stopper part 223. The connecting portion 222 is disposed in the first through hole 243, the main body 221 is disposed at an end of the connecting portion 222 away from the electrode assembly 23, and the limiting portion 223 is disposed at an end of the connecting portion 222 near the electrode assembly (not shown). Along the radial direction of the electrode terminal 22, the main body 221 and the stopper 223 protrude from the outer circumferential surface of the connecting part 222. Along the thickness direction X of the first wall 211, a portion of the adapter 24 is located between the stopper 223 and the main body 221.

The main body 221 is a portion of the electrode terminal 22 located outside the case 21 and a portion penetrating the terminal hole 211E.

The connection portion 222 is a portion of the electrode terminal 22 located in the first through hole 243.

The stopper 223 is a portion of the electrode terminal 22 located on a side of the adapter 24 away from the first wall 211, that is, a portion of which the radial dimension increases during caulking.

It is understood that the body 221, the connection portion 222, and the stopper 223 may be coaxially disposed to facilitate connection of the electrode terminal 22 with the first wall 211 and the adapter 24.

Alternatively, the body 221, the connection portion 222, and the stopper 223 may be integrally formed, or may be sequentially connected by welding.

The "in the radial direction of the electrode terminal 22, the body 221 and the stopper 223 both protrude from the outer circumferential surface of the connection part 222" may be understood as that the size of the body 221 in the radial direction and the size of the stopper 223 in the radial direction are both larger than the size of the connection part 222 in the radial direction.

A portion of the adapter 24 is located between the limiting part 223 and the main body 221 along the thickness direction X of the first wall 211, meaning that the assembly force generated by the riveting can clamp the adapter 24 with the main body 221 by the limiting part 223 in the thickness direction X of the first wall 211 during the riveting of the electrode terminal 22 and the adapter 24, that is, the assembly and positioning of the sealing member 25 can be adaptively completed during the riveting of the electrode terminal 22 and the adapter 24.

In some embodiments, the electrode terminal 22 includes a body 221, a connection part 222, and a stopper part 223. The main body 221, the connection portion 222, and the stopper 223 are coaxially connected in this order, and the dimension of the main body 221 in the radial direction is larger than the dimension of the connection portion 222 in the radial direction, and the dimension of the stopper 223 in the radial direction is not larger than the dimension of the connection portion 222 in the radial direction. A portion of the main body 221 is located outside the housing (not shown in the drawing), and another portion of the main body 221 is located in the terminal hole 211E such that the connection portion 222 and the stopper portion 223 are located inside the housing (not shown in the drawing). The connecting portion 222 is disposed through the first through hole 243, so that the limiting portion 223 is located on a side of the adaptor 24 away from the first wall 211. The size of the limiting portion 223 in the radial direction is then increased by applying an external force to the limiting portion 223 such that the size of the limiting portion 223 in the radial direction is larger than the size of the connecting portion 222 in the radial direction, and such that the end surface of the limiting portion 223 facing the main body 221 and the end surface of the main body 221 facing the limiting portion 223 abut against both side surfaces of the adapter 24 in the thickness direction X of the first wall 211, respectively, to structurally limit the adapter 24.

In the above-described embodiment, a part of the adapter 24 is located between the stopper 223 and the main body 221 along the thickness direction X of the first wall 211. So that the electrode terminal 22 can serve as a structural limit for the adapter 24, thereby limiting the movement of the adapter 24 relative to the electrode terminal 22 in the thickness direction X of the first wall 211, thereby improving the reliability of the adapter 24 and the electrode terminal 22 in cooperation with the compression seal 25, reducing the risk of leakage of electrolyte in the battery cell, and improving the reliability of the battery.

Referring to fig. 5, and with further reference to fig. 6, the body 221 includes a first portion 221A and a second portion 221B, according to some embodiments of the present application. The first portion 221A, the second portion 221B, and the connection portion 222 are sequentially arranged in the thickness direction X of the first wall 211. The radial dimension of the first portion 221A is larger than the radial dimension of the second portion 221B to form a stepped surface 221C on the outer peripheral surface of the main body 221. The first sealing portion 251 is located between the adapter 24 and the step surface 221C in the thickness direction X of the first wall 211.

The second portion 221B is a portion of the electrode terminal 22 connecting the first portion 221A and the connection portion 222.

The first portion 221A is a portion of the electrode terminal 22 for abutting against the first seal 251.

It is understood that the first portion 221A and the second portion 221B may be coaxially disposed to facilitate connection of the electrode terminal 22 with the first wall 211 and the adapter 24.

Alternatively, the first portion 221A and the second portion 221B may be integrally formed, or may be sequentially connected by welding.

The step surface 221C is a portion of the first portion 221A facing the side surface of the adapter 24, which does not overlap with the orthographic projection of the second portion 221B on the side surface.

In some embodiments, the first portion 221A, the second portion 221B, the connection portion 222, and the limiting portion 223 are coaxially connected in order, and a size of the second portion 221B in a radial direction is larger than a size of the connection portion 222 in a radial direction. The end surface of the stopper 223 facing the main body 221 and the end surface of the second portion 221B facing the stopper 223 are respectively abutted with two side surfaces of the adapter 24 in the thickness direction X of the first wall 211 to structurally limit the adapter 24. The first sealing part 251 is interposed between the adapter 24 and the step surface 221C in the thickness direction X of the first wall 211, and the first sealing part 251 is brought into abutment with the outer peripheral surface of the second portion 221B to fill the gap along the radial direction of the electrode terminal 22 between the first sealing part 251 and the outer peripheral surface of the second portion 221B. And the dimension of the first sealing portion 251 in the thickness direction X of the first wall 211 after the caulking is completed is made the same as the dimension of the second portion 221B in the thickness direction X of the first wall 211. Thus, the dimension of the first sealing portion 251 in the thickness direction X of the first wall 211 after the caulking is completed can be adjusted by adjusting the dimension of the second portion 221B in the thickness direction X of the first wall 211. And thus adjusts the pressing force of the adapter 24 against the first sealing part 251. The risk of the adapter 24 providing too much pressure against the first seal 251, resulting in damage to the first seal 251, is reduced. Thereby improving the reliability of the pressing seal 25 in cooperation with the electrode terminal 22 by the adapter 24, thereby reducing the risk of leakage of electrolyte in the battery cell 20, and improving the reliability of the battery 100.

In the above-described configuration, the first sealing portion 251 is located between the adapter 24 and the step surface 221C in the thickness direction X of the first wall 211. The step surface 221C is provided such that the portion of the first sealing part 251 abutting against the electrode terminal 22 is in surface contact, increasing the area of the first sealing part 251 abutting against the electrode terminal 22, thereby reducing the risk of leakage of electrolyte in the battery cell and improving the reliability of the battery.

Referring to fig. 7, and further referring to fig. 8, fig. 7 is a cross-sectional view of a portion of another battery cell 20 according to some embodiments of the present application, and fig. 8 is an enlarged view of a portion B of fig. 7. The second sealing portion 252 is located between the adapter 24 and the first wall 211 in the thickness direction X of the first wall 211.

The second seal 252 is a portion of the seal 25 interposed between the adapter 24 and the first wall 211 in the thickness direction X of the first wall 211.

The second sealing part 252 is located between the adapter 24 and the first wall 211, meaning that the assembly force generated by the riveting can cause the adapter 24 and the first wall 211 to press the second sealing part 252 during the riveting of the electrode terminal 22 and the adapter 24, so that the second sealing part 252 is deformed to fill the gap between the adapter 24 and the first wall 211 along the thickness direction X of the first wall 211, i.e., the assembly and positioning of the sealing member 25 are adaptively completed by the second sealing part 252 during the riveting of the electrode terminal 22 and the adapter 24.

In the above-described aspect, the second seal 252 is located between the adapter 24 and the first wall 211 in the thickness direction X of the first wall 211. So that the adapter 24 can be fitted with the first wall 211 to clamp opposite sides of the second sealing part 252 in the thickness direction X of the first wall 211, thereby filling the gap between the adapter 24 and the first wall 211, thereby reducing the risk of leakage of electrolyte in the battery cell and improving the reliability of the battery.

According to some embodiments of the present application, referring to fig. 7, and referring further to fig. 8, the battery cell 20 further includes a first insulating member 26, and at least a portion of the first insulating member 26 is located between the first wall 211 and the adapter 24 along the thickness direction X of the first wall 211.

The first insulating member 26 is a member that separates the first wall 211 from the adapter 24, and insulating isolation of the first wall 211 from the electrode assembly (not shown) and the adapter 24 is achieved by the first insulating member 26. The first insulating member 26 is made of an insulating material, and the first insulating member 26 may be made of an insulating material such as plastic, rubber, or the like.

Illustratively, the first insulator 26 may be attached to the first wall 211 by injection molding.

Optionally, the first wall 211 has an inner surface 211A facing the adapter 24, and the first insulator 26 is disposed on the inner surface 211A. At least a portion of the first insulating member 26 is located between the first wall 211 and the adapter member 24 in the thickness direction X of the first wall 211.

In some embodiments, the first wall 211 has an inner surface 211A facing the adapter 24, the inner surface 211A is recessed in a direction away from the adapter 24 to form a first receiving portion 211B, and at least a portion of the first insulating member 26 is positioned in the first receiving portion 211B, thereby reducing the size of the first wall 211 and the first insulating member 26 in the thickness direction X of the first wall 211, thereby increasing the space within the case for receiving the electrode assembly, which in turn may increase the installation space of the electrode assembly in the battery cell, thereby increasing the energy density of the battery cell.

In the above-described aspect, at least a portion of the first insulating member 26 is located between the first wall 211 and the adapter 24 in the thickness direction X of the first wall 211. When the switching piece moves along the thickness direction X of the first wall 211, the switching piece is limited to be abutted against the first wall 211, so that the risk of internal short circuit of the battery cell is reduced, and the reliability of the battery is improved.

Referring to fig. 7, and further to fig. 8, the first insulating member 26 has a second through hole 26A for passing the electrode terminal 22 therethrough, according to some embodiments of the present application. The second seal 252 abuts against the wall of the second through hole 26A in the radial direction of the electrode terminal 22.

The second through hole 26A is a through hole penetrating the first insulator 26 in the thickness direction X of the first wall 211.

In some embodiments, the first insulator 26 includes a first body portion 261 and a first extension portion 262. The first body portion 261 is provided on the inner surface 211A, and the first body portion 261 is provided with a second through hole 26A through which the electrode terminal 22 passes. The second through hole 26A communicates with the first accommodating portion 211B, the first extending portion 262 is disposed around the second through hole 26A, and the first extending portion 262 is at least partially located in the first accommodating portion 211B. Thereby reducing the size of the first wall 211 and the first insulating member 26 in the thickness direction X of the first wall 211, and thus, the installation space of the electrode assembly in the battery cell can be increased, thereby improving the energy density of the battery cell. The second through-hole 26A should be coaxial with the first through-hole 243 and the terminal hole 211E so that one end of the electrode terminal 22 toward the electrode assembly (not shown) passes through the second through-hole 26A.

In the above-described aspect, the second seal 252 abuts against the wall of the second through hole 26A in the radial direction of the electrode terminal 22. On the one hand, the second sealing part 252 abuts against the wall of the second through hole 26A to fill the gap between the electrode terminal 22 and the wall of the second through hole 26A, thereby reducing the risk of leakage of the electrolyte in the battery cell 20 and improving the reliability of the battery 100; on the other hand, the second sealing portion 252 is located in the second through hole 26A, so that when the adapter piece moves along the thickness direction X of the first wall 211, the portion of the adapter piece located in the second through hole 26A is limited to abut against the first wall 211, thereby reducing the risk of internal short circuit of the battery cell and improving the reliability of the battery.

Referring to fig. 7, and with further reference to fig. 8, the seal 25 includes a third seal 253, according to some embodiments of the present application. The third sealing portion 253 is located between the electrode terminal 22 and the wall of the terminal hole 211E in the radial direction of the electrode terminal 22.

The third seal portion 253 is a portion of the seal 25 interposed between the electrode terminal 22 and the wall of the terminal hole 211E in the radial direction of the electrode terminal 22.

In some embodiments, the seal 25 includes first 251 and second 252 and third 253 seal portions that are connected to one another. The third seal 253 is interposed between the electrode terminal 22 and the wall of the terminal hole 211E in the radial direction of the electrode terminal 22. The portion of the seal 25 protruding from the inner circumferential surface of the third seal portion 253 in the radial direction of the electrode terminal 22 is the first seal portion 251, and the portion of the seal 25 protruding from the outer circumferential surface of the third seal portion 253 in the radial direction of the electrode terminal 22 is the second seal portion 252. The first sealing part 251 is circumferentially disposed at the outer circumferential side of the electrode terminal 22, and both the first sealing part 251 and the second sealing part 252 are located in the second through hole 26A, and after the adapter 24 is connected to the electrode terminal 22 by caulking, the adapter 24 presses the sealing member 25 such that the side of the first sealing part 251 facing the electrode terminal 22 abuts against the outer circumferential surface of the electrode terminal 22. And the side surface of the second seal portion 252 facing the second through hole 26A is made to abut against the inner wall of the second through hole 26A.

In the above-described aspect, the third sealing portion 253 is located between the electrode terminal 22 and the wall of the terminal hole 211E in the radial direction of the electrode terminal 22. On the one hand, the electrode terminal 22 can be matched with the hole wall of the terminal hole 211E to clamp the inner peripheral side and the outer peripheral side of the third sealing part 253 in the radial direction of the electrode terminal 22, so that gaps between the electrode terminal 22 and the hole wall of the terminal hole 211E are filled, the risk of electrolyte leakage in a battery cell is reduced, the reliability of the battery is improved, and on the other hand, the third sealing part 253 is matched with the hole wall of the terminal hole 211E, a certain structure limiting effect can be achieved on the electrode terminal 22, and therefore the mounting reliability of the electrode terminal 22 is improved.

According to some embodiments of the present application, referring to fig. 7, and referring further to fig. 8, the battery cell 20 further includes a second insulating member 27, and the second insulating member 27 is used to separate the first wall 211 from the electrode terminal 22.

The second insulator 27 is a member that separates the first wall 211 from the adapter 24, and insulating isolation of the first wall 211 from the electrode terminal 22 is achieved by the second insulator 27. The second insulating member 27 is made of an insulating material, and the second insulating member 27 may be made of an insulating material such as plastic, rubber, or the like.

The second insulator 27 may be connected with the first wall 211 and the electrode terminal 22 by injection molding, for example.

Optionally, the first wall 211 has an outer surface 211C facing away from the adapter 24, and the second insulator 27 is disposed on the inner surface 211A. At least a portion of the first insulating member 26 is located between the first wall 211 and the electrode terminal 22 in the thickness direction X of the first wall 211.

In some embodiments, the first wall 211 has an outer surface 211C facing away from the adapter 24, the outer surface 211C is recessed toward the adapter 24 to form a second receiving portion 211D, and at least a portion of the second insulating member 27 is positioned in the second receiving portion 211D, thereby reducing the size of the first wall 211 and the second insulating member 27 in the thickness direction X of the first wall 211, and thus increasing the space within the case for receiving the electrode assembly, and thus increasing the installation space of the electrode assembly in the battery cell, and thus increasing the energy density of the battery cell.

In the above-described aspect, the second insulating member 27 serves to separate the first wall 211 from the electrode terminal 22 to limit abutment of the electrode terminal 22 with the first wall 211, thereby reducing the risk of internal short circuits of the battery cells and improving the reliability of the battery.

According to some embodiments of the present application, referring to fig. 7, and further referring to fig. 8, the third sealing portion 253 abuts against the second insulating member 27 along the thickness direction X of the first wall 211.

In some embodiments, the second insulator 27 includes a second body portion 271 and a second extension 272. The second body 271 is disposed on the outer surface 211C and located in the second accommodating portion 211D. Thereby reducing the size of the first wall 211 and the second insulating member 27 in the thickness direction X of the first wall 211, and thus, the installation space of the electrode assembly in the battery cell can be increased, thereby improving the energy density of the battery cell. The second body portion 271 is provided with a third through hole 27A through which the electrode terminal 22 passes. The third through hole 27A communicates with the terminal hole 211E, and the second extension 272 is disposed around the third through hole 27A, with the second extension 272 being at least partially located within the terminal hole 211E. And abuts against the third sealing portion 253.

In the above-described aspect, the third seal portion 253 is in contact with the second insulator 27 in the thickness direction X of the first wall 211. So that the second insulator 27 provides structural limitation to the third sealing part 253 in the thickness direction X of the first wall 211 to limit the movement of the third sealing part 253 relative to the electrode terminal 22 in the thickness direction X of the first wall 211, thereby improving the reliability of the third sealing part 253 filling the gap between the electrode terminal 22 and the wall of the terminal hole 211E, thereby reducing the risk of electrolyte leakage in the battery cell, and improving the reliability of the battery.

Referring to fig. 9, fig. 9 is a cross-sectional view of a portion of a structure of yet another battery cell 20 according to some embodiments of the present application. The electrode terminal 22 includes a first base 220A and a second base 220B, the first base 220A is disposed through the first through hole 243 and is riveted with the adapter 24, the second base 220B is connected to a side of the first base 220A away from the electrode assembly (not shown), the first base 220A is the same material as the adapter 24, and the second base 220B is different material from the adapter 24.

The first base 220A is a portion of the electrode terminal 22 that is inserted into the first through hole 243 and riveted to the adapter 24.

The second base 220B is a portion of the electrode terminal 22 that is inserted into the terminal hole 211E and is insulated from the first wall 211 by the second insulating member 27.

Illustratively, the first base 220A and the adapter 24 are made of metallic copper or copper alloy, the second base 220B is made of metallic aluminum, and the first base 220A and the second base 220B are connected by welding, which may be friction welding.

In some embodiments, the seal 25 includes a first seal portion 251 and a third seal portion 253 that are connected to each other. The first sealing portion 251 is interposed between the second base 220B and the adapter 24 in the thickness direction X of the first wall 211, and the side surface of the first sealing portion 251 facing the electrode terminal 22 is in contact with the outer peripheral surface of the first base 220A in the radial direction of the electrode terminal 22, and the third sealing portion 253 is in contact with the portion of the second insulator 27 located in the terminal hole 211E. The third sealing portion 253 is interposed between the second base 220B and the wall of the terminal hole 211E in the radial direction of the electrode terminal 22. Thereby sealing a portion of the side surface of the second substrate 220B located in the case (not shown) by the sealing member 25 and the first substrate 220A to reduce the risk of the second substrate 220B coming into contact with the electrolyte and thus reacting, and improving the reliability of the battery.

In the above-mentioned embodiment, the first substrate 220A and the adaptor 24 are made of the same material, and the second substrate 220B and the adaptor 24 are made of different materials. The first substrate 220A and the adapter 24 and the insulator cooperate to isolate the electrolyte from the second substrate 220B. To reduce the risk of the second substrate 220B coming into contact with the electrolyte and thus reacting, and to improve the reliability of the battery.

Referring to fig. 10, fig. 10 is a cross-sectional view illustrating a partial structure of yet another battery cell 20 according to some embodiments of the present application. The electrode terminal 22 is made of a different material from the adapter 24. The battery cell 20 further includes a separator 28, the separator 28 being positioned at one end of the electrode terminal 22 near the electrode assembly (not shown) in the thickness direction X of the first wall 211, the outer circumferential side of the separator 28 being connected to the adapter 24, the separator 28 being the same material as the adapter 24.

The separator 28 is a member for mounting the adapter 24 on a side close to the electrode assembly (not shown) and at an end of the electrode terminal 22 close to the electrode assembly (not shown) to isolate the electrolyte from the electrode terminal 22.

Illustratively, the adapter 24 and the insulator 28 are fabricated from metallic copper or copper alloy and the electrode terminal 22 is fabricated from metallic aluminum.

In some embodiments, the separator 28 may be a hollow structure having one side open, and the open-side adaptor 24 of the separator 28 is adjacent to one side of the electrode assembly (not shown) to define a receiving chamber for receiving one end of the electrode terminal 22 adjacent to the electrode assembly (not shown).

In the above-described embodiment, the outer peripheral side of the insulator 28 is connected to the adapter 24, and the insulator 28 and the adapter 24 are made of the same material. The separator 28 is allowed to cooperate with the adapter 24 to define a receiving cavity for receiving one end of the electrode terminal 22 riveted with the adapter 24 to isolate the electrolyte from the electrode terminal 22. To reduce the risk of contact of the electrode terminals 22 with the electrolyte and to improve the reliability of the battery.

Referring to fig. 10 and further referring to fig. 11, fig. 11 is a schematic structural diagram of an adaptor 24 according to some embodiments of the present application. The adaptor 24 includes an adaptor body 241 and a protrusion 242, and the protrusion 242 protrudes from a side of the adaptor body 241 facing the first wall 211. The protrusion 242 includes a top wall 242A and a peripheral wall 242B, the peripheral wall 242B surrounds the top wall 242A, the top wall 242A is connected to the adaptor body 241 through the peripheral wall 242B, and the first through hole 243 is disposed on the top wall 242A.

The adaptor body 241 is a portion of the adaptor 24 for connection with a tab (not shown).

The projection 242 is a portion of the adapter 24 for caulking the electrode terminal 22.

Illustratively, the protrusion 242 and the adaptor body 241 may be integrally formed by stamping, or may be connected to each other by welding, which is not limited by the embodiment of the present application.

The top wall 242A is a portion of the projection 242 that is crimped to the electrode terminal 22.

The peripheral wall 242B is a portion of the projection 242 connecting the bottom wall and the adapter body 241.

Illustratively, at least a portion of the surface of the top wall 242A facing the electrode terminal 22 may be a plane, and the first through hole 243 is disposed at the center of the plane.

In the above-described aspects, the protrusion 242 protrudes from a side of the adaptor body 241 facing the first wall 211 so as to be connected with the electrode terminal 22. The protrusion 242 includes a top wall 242A and a peripheral wall 242B, and the first through hole 243 is disposed on the top wall 242A, so that the top wall 242A is connected with the electrode terminal 22, thereby increasing the overcurrent area between the adaptor 24 and the electrode terminal 22, improving the overcurrent capability between the adaptor 24 and the electrode terminal 22, further improving the output current intensity of the battery cell, and improving the performance of the battery.

According to some embodiments of the present application, referring to fig. 10, a top wall 242A and a peripheral wall 242B are surrounded to form a recess 242C, at least a portion of the insulator 28 is located in the recess 242C, and an outer peripheral side of the insulator 28 is connected to an inner peripheral surface of the recess 242C.

The recess 242C is a portion formed by surrounding the side of the top wall 242A facing the electrode assembly (not shown in the figure) and the side of the peripheral wall 242B facing the end of the electrode terminal 22 near the electrode assembly (not shown in the figure).

The outer peripheral side of the insulator 28 and the inner peripheral surface of the recess 242C may be connected by welding, such as laser welding.

In the above-described aspect, at least a part of the separator 28 is located in the recess 242C, and the outer peripheral side of the separator 28 is connected to the inner peripheral surface of the recess 242C, so that the side surface of the separator 28 facing the first wall 211 and the inner peripheral surface of the recess 242C enclose an accommodating space for accommodating the portion of the electrode terminal 22 for caulking to isolate the electrolyte from the electrode terminal 22. To reduce the risk of contact of the electrode terminals 22 with the electrolyte and to improve the reliability of the battery.

In some embodiments, referring to fig. 12, and further referring to fig. 13, fig. 12 is an exploded view of a housing 21 according to some embodiments of the present application, and fig. 13 is an exploded view of another housing 21 according to some embodiments of the present application. The housing 21 includes a shell 212 and a cover plate 213. The housing 212 has an opening, and the cover plate 213 covers the opening. The first wall 211 is a cover plate 213, or the first wall 211 is a wall portion of the housing 212 opposite to the cover plate 213.

The case 212 is a member for accommodating an electrode assembly (not shown in the drawings).

The cover 213 is a member that covers the opening of the case 212 to isolate the internal environment of the battery cell 20 (not shown) from the external environment.

It is understood that the shape of the cover 213 may be adapted to the shape of the housing 212, for example, the housing 212 has a rectangular parallelepiped structure, and the cover 213 has a rectangular plate structure adapted to the housing 212. The material of the cover 213 may be various, such as copper, iron, aluminum, steel, aluminum alloy, etc., and the material of the cover 213 may be the same as or different from the material of the housing 212.

As can be appreciated, referring to the figures, the first wall 211 can be a cover plate 213; alternatively, referring to fig. 13, the first wall 211 may be a wall portion of the housing 212 opposite to the cover plate 213, which is not limited in the embodiment of the present application.

In the above-described aspects, the opening is designed to facilitate the accommodation of an electrode assembly (not shown) in the case 212 through the opening, and the cover plate 213 covers the opening to form a closed space for accommodating the electrode assembly (not shown).

According to some embodiments of the present application, a battery cell 20 is provided, see fig. 3-13.

The battery cell 20 includes a case 21, a first insulating member 26, a second insulating member 27, an electrode terminal 22, an electrode assembly 23, an adapter 24, and a sealing member 25.

The case 21 has a first wall 211, and the electrode terminal 22 is provided on the first wall 211 in an insulating manner.

In some embodiments, referring to fig. 12, the housing 21 includes a shell 212 and a cover plate 213. The housing 212 has an opening, the cover 213 covers the opening, and the first wall 211 is the cover 213.

In other embodiments, referring to fig. 13, the first wall 211 is a wall portion of the housing 212 opposite the cover plate 213.

The electrode assemblies 23 are stacked in the second direction Z, and the two electrode assemblies 23 are accommodated in the case 212, and the electrode assemblies 23 have tabs 231.

The adaptor 24 includes an adaptor body 241 and a protrusion 242, and the protrusion 242 protrudes from a side of the adaptor body 241 facing the first wall 211.

The tab 231 is connected to the adaptor body 241.

The protrusion 242 is provided with a first through hole 243 through which the electrode terminal 22 passes.

The first wall 211 has an outer surface 211C and an inner surface 211A which are disposed opposite to each other in a thickness direction X of the first wall 211, and a terminal hole 211E penetrating the outer surface 211C and the inner surface 211A.

The inner surface 211A is recessed in a direction away from the adapter 24 to form a first receiving portion 211B, and the first insulating member 26 includes a first body portion 261 and a first extension portion 262. The first body 261 is disposed on the inner surface 211A, and at least a portion of the first body 261 is located between the adaptor body 241 and the first wall 211 along the thickness direction X of the first wall 211. The first body portion 261 is provided with a second through hole 26A through which the electrode terminal 22 passes. The second through hole 26A communicates with the first accommodation portion 211B.

The projection 242 is positioned in the second through hole 26A.

The first extension portion 262 is disposed around the second through hole 26A, and the first extension portion 262 is at least partially located in the first accommodating portion 211B.

The outer surface 211C is recessed toward the adapter 24 to form a second accommodation portion 211D. The second insulating member 27 includes a second body portion 271 and a second extension portion 272. The second body 271 is disposed on the outer surface 211C and located in the second accommodating portion 211D. The second body portion 271 is provided with a third through hole 27A through which the electrode terminal 22 passes. The third through hole 27A communicates with the terminal hole 211E, and the second extension 272 is disposed around the third through hole 27A, with the second extension 272 being at least partially located within the terminal hole 211E.

The electrode terminal 22 includes a first portion 221A, a second portion 221B, a connection portion 222, and a stopper portion 223, which are sequentially connected. The radial dimension of the first portion 221A is greater than the radial dimension of the second portion 221B to form a stepped surface 221C on the outer circumferential surface of the electrode terminal 22. The second portion 221B has a radial dimension greater than that of the connecting portion 222, and the stopper 223 has a radial dimension not greater than that of the connecting portion 222.

The seal 25 includes a first seal portion 251 and a second seal portion 252 and a third seal portion 253 that are connected to each other.

The first portion 221A passes through the third through hole 27A and the terminal hole 211E in order. The connecting portion 222 is disposed through the first through hole 243, so that the limiting portion 223 is located on a side of the adaptor 24 away from the first wall 211. The size of the limiting portion 223 in the radial direction is then increased by applying an external force to the limiting portion 223 such that the size of the limiting portion 223 in the radial direction is larger than the size of the connecting portion 222 in the radial direction, and such that the end surface of the limiting portion 223 facing the main body 221 and the end surface of the main body 221 facing the limiting portion 223 abut against both side surfaces of the adapter 24 in the thickness direction X of the first wall 211, respectively, to structurally limit the adapter 24.

The first sealing portion 251 is interposed between the adapter 24 and the step surface 221C in the thickness direction X of the first wall 211 such that the first sealing portion 251 abuts against the outer peripheral surface of the second portion 221B and fills the gap along the radial direction of the electrode terminal 22 between the first sealing portion 251 and the outer peripheral surface of the second portion 221B.

The second sealing portion 252 is located between the adapter 24 and the first wall 211 in the thickness direction X of the first wall 211. The second seal 252 abuts against the wall of the second through hole 26A in the radial direction of the electrode terminal 22.

The third sealing portion 253 abuts against a portion of the second insulator 27 located in the terminal hole 211E in the thickness direction X of the first wall 211. The third sealing portion 253 is interposed between the first portion 221A and the wall of the terminal hole 211E in the radial direction of the electrode terminal 22.

In some embodiments, referring to fig. 9, the electrode terminal 22 includes a first base 220A and a second base 220B, wherein the first base 220A includes a second portion 221B, a connection portion 222, and a stopper portion 223, and the second base 220B includes the first portion 221A. The first base 220A and the adapter 24 are made of metallic copper or copper alloy, the second base 220B is made of metallic aluminum, and the first base 220A and the second base 220B are connected by welding.

In other embodiments, referring to fig. 10, and referring to fig. 11, the electrode terminal 22 and the adapter 24 are made of different materials. The battery cell 20 also includes an insulator 28. The protrusion 242 includes a top wall 242A and a peripheral wall 242B, the peripheral wall 242B is enclosed on the top wall 242A, the top wall 242A is connected with the adaptor body 241 through the peripheral wall 242B, and the top wall 242A is provided with a first through hole 243 through which the electrode terminal 22 passes. The top wall 242A and the peripheral wall 242B define a recess 242C, at least a portion of the insulator 28 is positioned in the recess 242C, and the outer peripheral side of the insulator 28 is connected to the inner peripheral surface of the recess 242C.

In the above-described aspects, the adapter 24 is configured to press the sealing member 25 against the first wall 211 and the electrode terminal 22. In this way, the adapter 24 can press the seal 25 in cooperation with the electrode terminal 22, and the adapter 24 can press the seal 25 in cooperation with the first wall 211. To fill the gap between the adapter 24 and the electrode terminal 22 and to fill the gap between the adapter 24 and the first wall 211, to reduce the risk of electrolyte leakage in the battery cell 20. Particularly when the tab is simultaneously engaged with the first wall 211 and the electrode terminal 22 to press the sealing member 25, the gap between the tab 24 and the first wall 211 and the gap between the tab 24 and the electrode terminal 22 can be simultaneously filled, which is advantageous in improving the reliability of the battery 100.

And the electrode terminal 22 is inserted into the first through hole 243 and is riveted with the adapter 24. In the first aspect, the adaptor 24 can perform structural limitation on the electrode terminal 22, so that the adaptor 24 can limit the movement of the electrode terminal 22, thereby improving the reliability of the electrode terminal 22; in the second aspect, the form of caulking can restrict the movement of the adapter 24 in the thickness direction X of the first wall 211, so that the adapter 24 can be fitted with the electrode terminal 22 to press the sealing member 25 in the thickness direction X of the first wall 211. In the third aspect, during the caulking of the electrode terminal 22 and the adapter 24, the fitting force generated by the caulking may cause the adapter 24 and the electrode terminal 22 to press the sealing member 25, deforming the sealing member 25 to fill the gap between the adapter 24 and the electrode terminal 22 in the thickness direction X of the first wall 211, and/or to fill the gap between the adapter 24 and the first wall 211 in the thickness direction X of the first wall 211, i.e., the fitting of the sealing member 25, which is adaptively completed during the caulking of the adapter 24 by the electrode terminal 22. Meanwhile, the sealing member 25 is pressed in the housing 21 through the adaptor 24, so that the battery cell 20 can be tightly pressed without adopting the electrode terminal 22 to be matched with the outer surface 211C of the first wall 211, and thus, when the electrode terminal 22 with the same specification is adopted, the height of the electrode terminal 22 beyond the first wall 211 can be correspondingly reduced, the occupation ratio of the space inside the housing 21 of the battery cell 20 to the total space of the battery 100 is improved, the installation space of the electrode assembly 23 is further improved, and the energy density of the battery 100 is further improved.

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.

The above embodiments are only for illustrating the technical solution of the present application, and are not intended to limit the present application, and various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A battery cell, comprising:

a housing including a first wall provided with a terminal hole;

an electrode terminal at least a portion of which is located within the terminal hole;

an electrode assembly accommodated in the case;

an adapter for electrically connecting the tab of the electrode assembly and the electrode terminal;

Wherein the battery cell further comprises a seal, the adapter being configured to compress the seal against the first wall and the electrode terminal.

2. The battery cell as defined in claim 1, wherein the adapter is provided with a first through hole, and the electrode terminal is penetrated through the first through hole and riveted with the adapter.

3. The battery cell of claim 2, wherein the seal comprises a first seal portion;

The first sealing part is located between the adapter and the electrode terminal in a thickness direction of the first wall.

4. The battery cell as defined in claim 3, wherein the electrode terminal comprises a main body, a connection portion and a limit portion, the connection portion is located in the first through hole, the main body is disposed at an end of the connection portion away from the electrode assembly, and the limit portion is disposed at an end of the connection portion near the electrode assembly;

The main body and the limiting part are protruded from the outer peripheral surface of the connecting part along the radial direction of the electrode terminal;

Along the thickness direction of the first wall, a part of the adapter is positioned between the limiting part and the main body.

5. The battery cell according to claim 4, wherein the main body includes a first portion and a second portion, the first portion, the second portion, and the connecting portion being sequentially arranged in a thickness direction of the first wall, a radial dimension of the first portion being greater than a radial dimension of the second portion to form a stepped surface on an outer peripheral surface of the main body;

The first sealing portion is located between the adapter and the step surface in a thickness direction of the first wall.

6. The battery cell of claim 2, wherein the seal comprises a second seal portion;

the second sealing portion is located between the adapter and the first wall in a thickness direction of the first wall.

7. The battery cell of claim 6, further comprising a first insulator, at least a portion of the first insulator being located between the first wall and the adapter along a thickness direction of the first wall.

8. The battery cell as defined in claim 7, wherein the first insulating member has a second through hole for passing the electrode terminal therethrough;

The second sealing part is abutted with the hole wall of the second through hole along the radial direction of the electrode terminal.

9. The battery cell of claim 2, wherein the seal comprises a third seal;

the third sealing part is located between the electrode terminal and a wall of the terminal hole in a radial direction of the electrode terminal.

10. The battery cell of claim 9, further comprising a second insulator separating the first wall from the electrode terminal.

11. The battery cell as defined in claim 10, wherein the third sealing part abuts the second insulating member in a thickness direction of the first wall.

12. The battery cell as defined in claim 2, wherein the electrode terminal comprises a first base body and a second base body, the first base body is penetrated through the first through hole and riveted with the adapter, the second base body is connected to one side of the first base body far away from the electrode assembly, the first base body and the adapter are the same material, and the second base body and the adapter are different materials.

13. The battery cell of claim 2, wherein the electrode terminal is a different material than the adapter;

The battery cell also comprises an isolation member, the isolation member is positioned at one end of the electrode terminal, which is close to the electrode assembly, along the thickness direction of the first wall, the outer periphery side of the isolation member is connected with the adapter member, and the isolation member and the adapter member are made of the same material.

14. The battery cell of claim 13, wherein the adapter comprises an adapter body and a protrusion protruding from a side of the adapter body facing the first wall;

The convex part comprises a top wall and a peripheral wall, the peripheral wall is arranged on the top wall in a surrounding mode, the top wall is connected with the adapter body through the peripheral wall, and the first through hole is formed in the top wall.

15. The battery cell as recited in claim 14, wherein the top wall and the peripheral wall define a recess, at least a portion of the separator being located within the recess, an outer peripheral side of the separator being connected to an inner peripheral surface of the recess.

16. The battery cell of any one of claims 1-15, wherein the housing comprises a shell having an opening and a cover plate closing the opening;

the first wall is the cover plate, or the first wall is a wall part of the shell opposite to the cover plate.

17. A battery comprising a cell according to any one of claims 1-16.

18. A powered device comprising a battery as recited in claim 17, wherein the battery is configured to provide electrical energy.