Battery cell, battery device, and electric device

Abstract

Provided in the embodiments of the present application are a battery cell, a battery device, and an electric device. The battery cell comprises a housing, an electrode assembly, an electrode terminal and a sealing member. The housing comprises a first wall, which comprises a wall portion and a connecting portion, the wall portion being provided with an electrode lead-out hole. The electrode assembly is disposed within the housing, and the electrode assembly is provided with a tab. The electrode terminal covers the electrode lead-out hole; the electrode terminal comprises a main body portion and a flange portion, the main body portion being electrically connected to the tab; at least part of the connecting portion is arranged on the periphery of the electrode terminal; and in the thickness direction of the wall portion, at least part of the flange portion is arranged between the wall portion and the connecting portion, the connecting portion being used for fixing the electrode terminal to the wall portion. The sealing member is arranged around the electrode lead-out hole; in the thickness direction of the wall portion, at least part of the sealing member is located between the flange portion and the wall portion. The hardness of the wall portion is greater than that of the electrode terminal. The technical solution of the present application can improve the reliability of the battery cell.

Description

Battery cell, battery device and electric device TECHNICAL FIELD

[0001] The present application relates to the technical field of battery device, in particular to a battery cell, a battery device and an electric device. BACKGROUND

[0002] Energy saving and emission reduction is the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their energy saving and environmental protection advantages. For electric vehicles, battery technology is an important factor for their development.

[0003] In the manufacturing process of the battery device, the reliability of the battery device is a problem that cannot be ignored. Therefore, how to improve the reliability of the battery device is a technical problem that needs to be solved in the battery device technology. SUMMARY

[0004] The present application provides a battery cell, a battery device and an electric device, which can improve the reliability of the battery cell.

[0005] The present application is realized by the following technical scheme:

[0006] In a first aspect, the present application provides a battery cell, which comprises a shell, an electrode assembly, an electrode terminal and a sealing member. The shell comprises a first wall, the first wall comprising a wall portion and a connecting portion, the wall portion being provided with an electrode lead-out hole, and the connecting portion being connected with the wall portion; the electrode assembly is arranged in the shell, and the electrode assembly has a tab; the electrode terminal is arranged on the first wall, and the electrode terminal covers the electrode lead-out hole, the electrode terminal comprising a main body portion and a flange portion protruding from the periphery of the main body portion, the main body portion being electrically connected with the tab, at least part of the connecting portion being arranged outside the periphery of the electrode terminal, at least part of the flange portion being arranged between the wall portion and the connecting portion along the thickness direction of the wall portion, and the connecting portion being used for fixing the electrode terminal to the wall portion; the sealing member is arranged around the electrode lead-out hole, and at least part of the sealing member is located between the flange portion and the wall portion along the thickness direction of the wall portion; and the hardness of the first wall is greater than the hardness of the electrode terminal.

[0007] According to the battery cell of the present application, the sealing member is arranged, which can improve the sealing effect between the flange portion and the first wall, and reduce the risk of electrolyte flowing between the flange portion and the wall portion; by designing the hardness of the wall portion to be greater than the hardness of the electrode terminal, the wall portion has high anti-deformation ability, can resist the force transmitted by the electrode terminal to the wall portion, and the wall portion and the connecting portion cooperate to exert good clamping effect on the electrode terminal and the sealing member, so that the sealing interface between the electrode terminal and the wall portion is good, thereby facilitating the improvement of the reliability of the battery cell.

[0008] According to some embodiments of the present application, the material of the wall portion is the same as the material of the connecting portion.

[0009] In the above scheme, the material of the wall portion is the same as that of the connecting portion, facilitating processing and manufacturing, for example, the wall portion and the connecting portion can be integrally formed, or the wall portion and the connecting portion are welded.

[0010] According to some embodiments of the present application, the hardness of the wall portion is H1, satisfying 100HV≤H1≤500HV.

[0011] In the above scheme, the hardness of the wall portion is set to be greater than or equal to 100HV and less than or equal to 500HV, on the one hand, the wall portion has high strength and toughness and is not easy to deform under stress; on the other hand, the wall portion has low processing difficulty and high reliability and durability.

[0012] According to some embodiments of the present application, 150HV≤H1≤350HV.

[0013] In the above scheme, the hardness of the wall portion is greater than or equal to 150HV and less than or equal to 350HV, further making the wall portion have high strength and toughness and not easy to deform under stress; further making the wall portion have low processing difficulty and high reliability and durability.

[0014] According to some embodiments of the present application, the hardness of the electrode terminal is H2, satisfying 20HV≤H2≤100HV.

[0015] In the above scheme, the hardness of the electrode terminal is set to be greater than or equal to 20HV and less than or equal to 100HV, on the one hand, the electrode terminal has high strength and is not easy to deform under stress, and on the other hand, it is convenient for processing and manufacturing.

[0016] According to some embodiments of the present application, 40HV≤H2≤70HV.

[0017] In the above scheme, when the hardness of the electrode terminal is greater than or equal to 40HV and less than or equal to 70HV, the electrode terminal further has high strength and is not easy to deform under stress, and further facilitates processing and manufacturing.

[0018] According to some embodiments of the present application, the material of the wall portion is steel, titanium alloy or carbon fiber resin composite material.

[0019] In the above scheme, the material of the wall portion is steel, titanium alloy or carbon fiber resin composite material, which has high hardness and good clamping effect on the electrode terminal and the sealing element.

[0020] According to some embodiments of the present application, the connecting portion includes a first section, the first section is located outside the wall portion, and at least a part of the flange portion is located between the first section and the wall portion along the thickness direction of the wall portion.

[0021] In the above scheme, the first section is located outside the wall portion, facilitating assembly of the electrode terminal with the first wall; the first section is used to clamp the flange portion in cooperation with the wall portion, so as to constrain movement of the electrode terminal along the thickness direction of the wall portion.

[0022] According to some embodiments of the present application, the first section and the sealing member at least partially overlap in the same projection plane perpendicular to the thickness direction of the wall portion.

[0023] In the above scheme, the first section and the sealing member at least partially overlap, and the first section has a better constraint effect on the flange portion, so as to absorb the force of the sealing member acting on the electrode terminal in the thickness direction of the wall portion.

[0024] According to some embodiments of the present application, the battery monomer further comprises a first insulating member arranged along the circumference of the electrode lead-out hole, at least part of the first insulating member being arranged between the electrode terminal and the connecting portion, and at least part of the first insulating member surrounding the electrode terminal.

[0025] In the above scheme, the arrangement of the first insulating member can separate the electrode terminal and the connecting portion, reducing the risk of short circuit of the electrode terminal and the first wall.

[0026] According to some embodiments of the present application, the connecting portion and the first insulating member are both arranged around the electrode terminal.

[0027] In the above scheme, the connecting portion is arranged around the electrode terminal, which can constrain the electrode terminal at any position in the circumferential direction of the electrode terminal; the first insulating member is arranged around the electrode terminal, which can separate the electrode terminal and the connecting portion at any position in the circumferential direction of the electrode terminal, improving the insulation effect.

[0028] According to some embodiments of the present application, the connecting portion and the wall portion are integrally formed.

[0029] In the above scheme, the connecting portion and the wall portion are integrally formed, facilitating processing and manufacturing, and the connecting portion and the wall portion have high connection stability.

[0030] According to some embodiments of the present application, the connecting portion and the wall portion are welded to form a first welding mark, and the first welding mark is arranged around the electrode terminal.

[0031] In the above scheme, the connecting portion and the wall portion are welded, which can improve the connection stability of the connecting portion and the wall portion, and the first welding mark is arranged around the electrode terminal, which can improve the connection reliability of the connecting portion and the wall portion.

[0032] According to some embodiments of the present application, the electrode terminal comprises a first part and a second part connected to each other, the first part and the second part are stacked along the thickness direction of the first wall, the first part is used for electrical connection with the busbar component, and the second part is used for electrical connection with the tab, the material of the first part is different from the material of the second part; the first part comprises a first main body part and a first flange part, the first flange part protrudes from the peripheral side of the first main body part; the second part comprises a second main body part and a second flange part, the second flange part protrudes from the peripheral side of the second main body part, the second main body part and the first main body part constitute a main body part, and the second flange part and the first flange part constitute a flange part, and the first flange part at least partially overlaps the second flange part along the thickness direction of the first wall.

[0033] In the above scheme, the material of the first part is different from the material of the second part, so as to facilitate electrical connection with the busbar component through the first part and electrical connection with the tab through the second part, and meet the assembly requirements of the electrode terminal with the busbar component and the tab; the second main body part and the first main body part are connected to constitute a main body part, and the second flange part and the first flange part are connected to constitute a flange part, which facilitates processing and manufacturing, and makes the electrode terminal have higher overall strength.

[0034] According to some embodiments of the present application, the material of the first part is aluminum, and the material of the second part is copper.

[0035] In the above scheme, the material of the first part is aluminum, which on the one hand reduces the cost, and on the other hand facilitates the connection with the busbar component; and the material of the second part is copper, which facilitates the welding with the tab. For example, when the material of the negative tab is copper, the material of the second part is copper, which facilitates the welding of the electrode terminal with the negative tab. Wherein, the material of the first part is aluminum, which means that the base material of the first part is aluminum, for example, the first part can be pure aluminum, or can also be an aluminum alloy.

[0036] According to some embodiments of the present application, the material of the electrode terminal is copper or aluminum.

[0037] In the above scheme, the material of the electrode terminal is copper or aluminum, which has good conductivity and facilitates the transmission of current.

[0038] According to some embodiments of the present application, the shell comprises a shell body and an end cover, the shell body has an opening, and the end cover covers the opening, and the end cover is the first wall.

[0039] In the above scheme, the end cover is the first wall, which facilitates the assembly of the electrode terminal with the first wall and the assembly of the electrode terminal with the electrode assembly.

[0040] According to some embodiments of the present application, the material of the shell is steel, titanium alloy or carbon fiber resin composite material.

[0041] In the above scheme, the shell adopts the above material, has higher hardness, and has higher anti-deformation ability.

[0042] In a second aspect, the embodiments of the present application further provide a battery device, which comprises the battery cell provided by any of the above embodiments.

[0043] In a third aspect, the embodiments of the present application further provide a power consuming device, which comprises the battery cell or the battery device provided by any of the above embodiments, and the battery cell or the battery device is used to provide electric energy.

[0044] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, and can be implemented according to the content of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application will be described. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments, it should be understood that the following drawings only show some embodiments of the present application, therefore should not be regarded as a limitation to the scope, for those skilled in the art, without paying creative labor, other related drawings can also be obtained according to these drawings.

[0046] Fig. 1 is a structural schematic diagram of a vehicle provided by some embodiments of the present application;

[0047] Fig. 2 is a structural exploded schematic diagram of a battery device provided by some embodiments of the present application;

[0048] Fig. 3 is a structural exploded schematic diagram of a battery cell provided by some embodiments of the present application;

[0049] Fig. 4 is a sectional view of part of the structure of a battery cell provided by some embodiments of the present application;

[0050] Fig. 5 is a local enlarged view of A in Fig. 4;

[0051] Fig. 6 is a structural schematic diagram of an electrode terminal provided by some embodiments of the present application.

[0052] In the drawings, the drawings are not drawn according to the actual scale.

[0053] Legend: 100 - battery device; 10 - case; 11 - first sub case; 12 - second sub case; 20 - battery cell; 21 - outer shell; 211 - shell; 212 - end cap; 22 - electrode assembly; 22a - tab; 23 - electrode terminal; 23a - first portion; 23b - second portion; 231 - main body portion; 231a - first main body portion; 231b - second main body portion; 232 - flange portion; 232a - first flange portion; 232b - second flange portion; 24 - seal; 25 - first wall; 251 - wall portion; 252 - connecting portion; 252a - first section; 252b - second section; 252c - third section; 253 - electrode lead-out hole; 254 - first weld; 26 - first insulator; 27 - second insulator; 200 - controller; 300 - motor; 1000 - vehicle; Q - central axis of main body portion; J - radial direction of main body portion; X - first direction; Y - second direction; Z - thickness direction of wall portion. DETAILED DESCRIPTION

[0054] The embodiments of the present application will be described in further detail to the accompanying drawings and examples. The following detailed description and drawings are merely exemplary in nature and are not intended to limit the scope of the application, that is, the application is not limited to the described embodiments.

[0055] Unless otherwise defined, 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 herein is for describing particular embodiments only and is not intended to be limiting of the application; the use herein of terms such as "comprise" and "comprising", and "have" and "having", and any variations thereof, is intended to cover a non-exclusive inclusion.

[0056] The terms "first", "second", and the like, as used in the specification and claims herein, are used for distinguishing between similar elements and not necessarily for describing a specific sequential or chronological order.

[0057] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another.

[0058] In the description of the application, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "attachment" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0059] The term "and / or" in this application is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this application generally represents that the front and rear associated objects have an "or" relationship.

[0060] "Multiple" appearing in this application refers to two or more (including two), and similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0061] The battery device mentioned in the embodiments of the application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, parallel or mixed connection through a busbar component.

[0062] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0063] In some embodiments, the battery device can be a battery pack, which includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

[0064] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box body by fixing the battery module in the box body.

[0065] As an example, the battery cell assembly can also be accommodated in the box body by directly fixing a plurality of battery cells in the box body.

[0066] As an example, the box body can include a first sub-box body and a second sub-box body. The first sub-box body and the second sub-box body are buckled to form a closed space inside the box body to accommodate the battery cell assembly. Here, closed means covered or closed, which can be sealed or unsealed. The first sub-box body can be a top cover or a bottom plate.

[0067] As an example, the box can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected with the frame, so that an enclosed space is formed inside the box to accommodate the battery cell assembly.

[0068] As an example, the box can be part of a chassis structure of a vehicle. For example, the top cover of the box can be at least part of a floor of the vehicle, or the frame of the box can be at least part of a cross beam and a longitudinal beam of the vehicle.

[0069] In some embodiments, the battery device is an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0070] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0071] The battery cell can be, but is not limited to, a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc.

[0072] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow the active ions to pass through.

[0073] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material arranged on at least one surface of the positive electrode current collector.

[0074] As an example, the positive electrode current collector has two opposite surfaces in the thickness direction thereof, and the positive electrode active material is arranged on any one or both of the two opposite surfaces of the positive electrode current collector.

[0075] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. with silver plating treatment on the surface can be used. The composite current collector can include a high polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a high polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0076] As an example, the positive electrode active material can include at least one of lithium-containing phosphates, lithium transition metal oxides, and modified compounds of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material can also be used.

[0077] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0078] As an example, the negative electrode current collector can employ a metal foil or a composite current collector. For example, as a metal foil, aluminum with a silver plating surface treatment, stainless steel with a silver plating surface treatment, stainless steel, copper, aluminum, nickel, a carbon electrode, and the like with carbon, nickel, or titanium can be employed.

[0079] In some embodiments, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is disposed on either one or both of the two surfaces of the negative electrode current collector.

[0080] As an example, the negative electrode active material can employ a negative electrode active material for a battery known in the art. As an example, the negative electrode active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, lithium titanate, and the like. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can also be used as a battery negative electrode active material can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0081] In some embodiments, the separator is a separator film. The present application does not particularly limit the type of the separator film, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0082] As an example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride, and ceramic. The separator film can be a single layer film or a multi-layer composite film, and is not particularly limited. When the separator film is a multi-layer composite film, the materials of the respective layers can be the same or different, and are not particularly limited. The separator can be a separate member located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes.

[0083] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive and negative electrodes, and functions to transport ions and separate the positive and negative electrodes.

[0084] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound to form the wound structure.

[0085] In some embodiments, the electrode assembly is a stacked structure.

[0086] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel housing, an aluminum housing, a composite metal housing (such as a copper-aluminum composite housing), or a resin fiber composite housing, etc.

[0087] In some embodiments, the housing includes an end cap and a housing body, the housing body is provided with an opening, and the end cap closes the opening to form a sealed space for accommodating the electrode assembly and the electrolyte, etc. The housing body can be provided with one or more openings. The end cap can also be provided with one or more openings.

[0088] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab, or indirectly connected to the tab through an adapter. The electrode terminal can be provided on the end cap or on the housing body.

[0089] In some embodiments, an explosion-proof valve is provided on the housing. The explosion-proof valve is used to release the internal pressure of the battery cell.

[0090] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a sealed structure, the housing can protect the electrode assembly and prevent electrolyte leakage, etc. When the housing is a non-sealed structure, the housing can protect the electrode assembly, and a sealing bag can be further included between the housing and the electrode assembly, the sealing bag is used to encapsulate the electrode assembly and the electrolyte, etc. Specifically, the sealing bag can be a bag-shaped insulating member or an aluminum-plastic film.

[0091] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, or a battery cell of other shapes, the prismatic battery cell includes a square battery cell, a blade-shaped battery cell, a multi-prismatic battery cell, such as a hexagonal prismatic battery cell, etc.

[0092] The development of battery device technology needs to consider various design factors, such as performance parameters such as energy density, discharge capacity, charge-discharge rate, etc., in addition to the reliability of the battery device.

[0093] In some embodiments, the battery cell includes a shell, an electrode assembly and an electrode terminal, the electrode assembly is arranged in the shell and has a winding structure; the shell includes a first wall, the first wall is provided with an electrode lead-out hole, the electrode terminal is arranged on the first wall and covers the electrode lead-out hole, the first wall includes a wall portion and a connecting portion, the connecting portion is used for fixing the electrode terminal to the wall portion, and the electrode terminal is electrically connected to the tab of the electrode assembly through the electrode lead-out hole. In order to reduce the risk of electrolyte leakage, a sealing member is usually arranged between the electrode terminal and the wall portion, and the sealing member is arranged around the electrode lead-out hole, so that the electrode terminal and the wall portion are sealingly connected through the sealing member. The electrode terminal connects the busbar member and the tab of the electrode assembly, and the electrode terminal transmits the force applied by the busbar member to the wall portion and the connecting portion. Since the hardness of the electrode terminal is greater than or equal to the hardness of the wall portion, the wall portion is easily deformed under the action of the electrode terminal, the clamping force of the wall portion and the connecting portion on the electrode terminal is reduced, and thus the sealing effect between the electrode terminal and the wall portion is lost. In the use process or the transportation process of the battery cell, the electrolyte in the shell is easily shaken, and the shaken electrolyte is easily flowed out of the shell from the electrode lead-out hole. When the sealing effect between the electrode terminal and the wall portion is lost, the electrolyte is easily leaked from the gap between the electrode terminal and the wall portion, thereby causing a safety risk.

[0094] In order to solve the problem of low reliability of the battery cell caused by the safety risk of electrolyte leakage, the present application provides a battery cell including a shell, an electrode assembly, an electrode terminal and a sealing member. The shell includes a first wall, the first wall includes a wall portion and a connecting portion, the wall portion is provided with an electrode lead-out hole, and the connecting portion is connected to the wall portion; the electrode assembly is arranged in the shell and has a tab; the electrode terminal is arranged on the first wall and covers the electrode lead-out hole, the electrode terminal includes a main body portion and a flange portion protruding from the peripheral side of the main body portion, the main body portion is electrically connected to the tab, at least part of the connecting portion is arranged outside the periphery of the electrode terminal, at least part of the flange portion is arranged between the wall portion and the connecting portion along the thickness direction of the wall portion, and the connecting portion is used for fixing the electrode terminal to the wall portion; the sealing member is arranged around the electrode lead-out hole, and at least part of the sealing member is located between the flange portion and the wall portion along the thickness direction of the wall portion; and the hardness of the wall portion is greater than the hardness of the electrode terminal. The battery cell has high reliability.

[0095] In the battery monomer, the sealing member is arranged around the electrode lead-out hole, and at least a part of the sealing member is located between the flange portion and the wall portion, the sealing effect between the flange portion and the first wall can be improved to reduce the risk of electrolyte flowing between the flange portion and the wall portion; by designing the hardness of the wall portion to be greater than the hardness of the electrode terminal, the wall portion has a higher anti-deformation ability, which can resist the force transmitted to the wall portion by the electrode terminal, facilitate the cooperation of the wall portion and the connecting portion to clamp the electrode terminal and the sealing member, make the clamping effect of the wall portion and the connecting portion on the electrode terminal and the sealing member better, make the sealing interface between the electrode terminal and the wall portion good, and thus improve the reliability of the battery monomer.

[0096] The battery monomer and the battery device disclosed in the embodiments of the present application can be used in, but are not limited to, an electric device such as a vehicle, a ship or an aircraft. The power supply system of the electric device can be composed of the battery monomer and the battery device disclosed in the present application.

[0097] The technical solutions described in the embodiments of the present application are applicable to various electric devices using battery monomers and battery devices.

[0098] The electric device can include a mobile phone, a portable device, a notebook computer, an electric vehicle, an electric toy, an electric tool, a vehicle, a ship and a spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.

[0099] The following embodiments are described by taking a vehicle as an example for convenience of description.

[0100] Please refer to FIG. 1, which is a structural schematic diagram of a vehicle provided by some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, the head or the tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000, which is used for the circuit system of the vehicle 1000, for example, for the working power demand of the vehicle 1000 during starting, navigation and running.

[0101] The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the working power demand of the vehicle 1000 during starting, navigation, and running.

[0102] In some embodiments of the present application, the battery device 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing the fuel or natural gas to provide driving power for the vehicle 1000.

[0103] Please refer to FIG. 2, which is a structural exploded view of the battery device provided in some embodiments of the present application. The battery device 100 includes a box body 10 and a battery cell 20, and the battery cell 20 is contained in the box body 10. The box body 10 is used to provide a containing space for the battery cell 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first sub-box body 11 and a second sub-box body 12, and the first sub-box body 11 and the second sub-box body 12 are mutually covered to jointly define a containing space for containing the battery cell 20. The second sub-box body 12 can be a hollow structure with one end open, and the first sub-box body 11 can be a plate-shaped structure, which is covered on the open side of the second sub-box body 12 to jointly define the containing space with the second sub-box body 12; the first sub-box body 11 and the second sub-box body 12 can also be hollow structures with one side open, and the open side of the first sub-box body 11 is covered on the open side of the second sub-box body 12.

[0104] In the battery device 100, the battery cell 20 can be multiple, and the multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection, where the mixed connection means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and then the whole of the multiple battery cells 20 is contained in the box body 10; of course, the battery device 100 can also be that the multiple battery cells 20 are first connected in series, in parallel, or in a mixed connection to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, which is contained in the box body 10. The battery device 100 can also include other structures, for example, the battery device 100 can also include a current combing component for realizing the electrical connection between the multiple battery cells 20.

[0105] Please refer to FIG. 3, which is a structural exploded view of the battery cell provided in some embodiments of the present application. The battery cell 20 refers to the smallest unit that constitutes the battery device 100. As shown in FIG. 3, the battery cell 20 includes a shell 21, an electrode assembly 22, and other functional components.

[0106] The shell 21 includes a shell body 211 and an end cover 212, and the shell body 211 has an opening, and the end cover 212 closes the opening to isolate the internal environment of the battery cell 20 from the external environment.

[0107] The shell 211 is a component for fitting the end cover 212 to form an internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 22, electrolyte and other components. The shell 211 and the end cover 212 can be independent components. The shell 211 can be of various shapes and sizes. Specifically, the shape of the shell 211 can be determined according to the specific shape and size of the electrode assembly 22. The material of the shell 211 can be various, such as iron, steel, aluminum alloy, titanium alloy, resin fiber composite material, etc.

[0108] The end cover 212 refers to a component that covers the opening of the shell 211 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cover 212 can be adapted to the shape of the shell 211 to fit the shell 211. Optionally, the end cover 212 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover 212 is not easily deformed when subjected to extrusion collision, so that the battery cell 20 can have higher structural strength, and the reliability can also be improved. The end cover 212 can be provided with functional components such as electrode terminals. The electrode terminals can be used to electrically connect with the electrode assembly 22 for outputting or inputting the electrical energy of the battery cell 20. The material of the end cover 212 can also be various, such as iron, steel, aluminum alloy, titanium alloy, resin fiber composite material, etc., which are not specially limited in the embodiments of the present application. In some embodiments, an insulating structure can also be provided on the inner side of the end cover 212, which can be used to isolate the electrical connection components in the shell 211 from the end cover 212 to reduce the risk of short circuit. Exemplarily, the insulating structure can be plastic, rubber, etc.

[0109] The electrode assembly 22 is a component in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 22 can be contained in the shell 211. The electrode assembly 22 is mainly formed by winding or stacking the positive and negative electrode sheets, and generally has a separator film between the positive and negative electrode sheets, which is used to separate the positive and negative electrode sheets to avoid internal short circuit of the positive and negative electrode sheets. The positive and negative electrode tabs can be located at one end of the main body or at two ends of the main body respectively.

[0110] According to some embodiments of the present application, referring to FIG. 3, and further referring to FIG. 4 and FIG. 5, FIG. 4 is a sectional view of a partial structure of a battery cell provided by some embodiments of the present application, and FIG. 5 is an enlarged view of a portion A of FIG. 4. The present application provides a battery cell 20, which includes a housing 21, an electrode assembly 22, an electrode terminal 23, and a sealing member 24. The housing 21 includes a first wall 25, the first wall 25 including a wall portion 251 provided with an electrode lead-out hole 253, and a connecting portion 252 connected with the wall portion 251; the electrode assembly 22 is arranged in the housing 21, and the electrode assembly 22 has a tab 22a; the electrode terminal 23 is arranged on the first wall 25, the electrode terminal 23 covers the electrode lead-out hole 253, and the electrode terminal 23 includes a main body portion 231 and a flange portion 232 protruding from a peripheral side of the main body portion 231, the main body portion 231 is electrically connected with the tab 22a, at least a portion of the connecting portion 252 is arranged on an outer periphery of the electrode terminal 23, at least a portion of the flange portion 232 is arranged between the wall portion 251 and the connecting portion 252 along a thickness direction Z of the wall portion, and the connecting portion 252 is used to fix the electrode terminal 23 to the wall portion 251; the sealing member 24 is arranged around the electrode lead-out hole 253, and at least a portion of the sealing member 24 is located between the flange portion 232 and the wall portion 251 along the thickness direction Z of the wall portion; and the hardness of the wall portion 251 is greater than the hardness of the electrode terminal 23.

[0111] The first wall 25 can be an end cover 212, or a wall body of the shell 211.

[0112] The wall portion 251 and the connecting portion 252 are two components constituting the first wall 25. For example, the wall portion 251 and the connecting portion 252 can be arranged separately, and the connecting portion 252 is connected to the wall portion 251, such as being welded to the wall portion 251. For another example, the wall portion 251 and the connecting portion 252 can be integrally formed, such as being stamping formed, or being molded formed.

[0113] In some embodiments, the wall portion 251 can be a rectangular plate structure.

[0114] The electrode lead-out hole 253 is a through hole penetrating through the wall portion 251 along the thickness direction Z of the wall portion. The shape of the electrode lead-out hole 253 can be circular, square, or irregular, etc. The thickness direction Z of the wall portion can be the thickness direction of the first wall 25.

[0115] The peripheral side of the main body portion 231 can be an outer peripheral surface of the main body portion 231, the main body portion 231 has a first surface facing the inside of the battery cell 20 and a second surface facing away from the inside of the battery cell 20 along the thickness direction Z of the wall portion, and the outer peripheral surface of the main body portion 231 connects the first surface and the second surface. The first surface is used to electrically connect with the tab 22a, and the second surface is used to electrically connect with a busbar component.

[0116] The electrode assembly 22 and the electrolyte are accommodated in the case 21. The electrode assembly 22 can be in a jelly-roll structure, or the electrode assembly 22 can be in a stacked structure.

[0117] In some embodiments, the battery cell 20 can be a square battery cell, for example, the electrode assembly 22 can be flat, the thickness direction of the electrode assembly 22 can be perpendicular to the thickness direction Z of the wall portion, the thickness direction of the electrode assembly 22 is parallel to the first direction X, and the first direction X can be parallel to the thickness direction of the battery cell 20. When the electrode assembly 22 is in a jelly-roll structure, the electrode assembly 22 includes a flat area and a bent area, and the thickness direction of the electrode assembly 22 is parallel to the stacking direction of the electrode tab of the flat area. When the electrode assembly 22 is in a stacked structure, the thickness direction of the electrode assembly 22 is parallel to the stacking direction of the electrode tab.

[0118] The electrode terminal 23 is an electrically conductive member, which is internally electrically connected to the electrode tab 22a of the electrode assembly 22 and externally electrically connected to an electrically conductive member (such as a busbar) outside the battery cell 20 to output or input the electrical energy of the battery cell 20. The material of the electrode terminal 23 can be a metal material, such as copper, aluminum, etc.

[0119] The electrode lead-out hole 253 can be provided in two, and the two electrode lead-out holes 253 are spaced apart, for example, the two electrode lead-out holes 253 can be spaced apart along the second direction Y, the length direction of the wall portion 251 is parallel to the second direction Y, and the second direction Y can be parallel to the length direction of the battery cell 20. The number of electrode terminals 23 can be two, and the two electrode terminals 23 are respectively a positive electrode terminal and a negative electrode terminal, and the positive electrode terminal and the negative electrode terminal correspond to one electrode lead-out hole 253 respectively; the electrode assembly 22 has a positive electrode tab and a negative electrode tab, and the positive electrode tab is electrically connected to the positive electrode terminal, and the negative electrode tab 22a is electrically connected to the negative electrode terminal.

[0120] The flange portion 232 protrudes from the circumferential side of the main body portion 231, and the flange portion 232 is provided around the circumference of the main body portion 231. In some embodiments, the main body portion 231 can be in a cylindrical shape, and the flange portion 232 is provided around the circumference of the main body portion 231.

[0121] The main body portion 231 and the flange portion 232 cooperatively cover the electrode lead-out hole 253, the main body portion 231 corresponds to the electrode lead-out hole 253, and at least a portion of the flange portion 232 overlaps with the wall portion 251. At least a portion of the flange portion 232 overlaps with the wall portion 251 as viewed along the thickness direction Z of the wall portion.

[0122] The flange portion 232 can be located on the inner side of the wall portion 251, or on the outer side of the wall portion 251. The inner side of the wall portion 251 refers to the side of the wall portion 251 facing the electrode assembly 22, i.e., the side of the wall portion 251 facing the inside of the battery cell 20. The outer side of the wall portion 251 refers to the side of the wall portion 251 facing away from the electrode assembly 22, i.e., the side of the wall portion 251 facing the outside of the battery cell 20.

[0123] In some embodiments, a portion of the main body portion 231 can extend into the electrode lead-out hole 253 to facilitate electrical connection between the electrode terminal 23 and the tab 22a. In other embodiments, the battery cell 20 can further include an adapter, a portion of the adapter extending into the electrode lead-out hole 253 and being electrically connected to the main body portion 231, and another portion of the adapter being electrically connected to the tab 22a.

[0124] The connecting portion 252 and the flange portion 232 are located on the same side of the wall portion 251. In the thickness direction Z of the wall portion, at least a portion of the flange portion 232 is disposed between the wall portion 251 and the connecting portion 252. In the same projection plane perpendicular to the thickness direction Z of the wall portion, the orthogonal projection of the flange portion 232 at least partially overlaps the orthogonal projection of the connecting portion 252.

[0125] The sealing member 24 is an electrically insulating component, and the material of the sealing member 24 can be plastic or rubber, etc. The sealing member 24 is configured to elastically deform to form a sealing interface between the flange portion 232 and the wall portion 251. The sealing member 24 is disposed around the electrode lead-out hole 253 to form a sealing interface at any position in the circumferential direction of the electrode lead-out hole 253, thereby reducing the risk of leakage of electrolyte between the flange portion 232 and the wall portion 251 after the electrolyte flows out of the electrode lead-out hole 253.

[0126] In the thickness direction Z of the wall portion, at least a portion of the sealing member 24 is located between the flange portion 232 and the wall portion 251. The connecting portion 252 cooperates with the wall portion 251 to clamp the flange portion 232 and the sealing member 24, so that the electrode terminal 23 is fixed to the wall portion 251, and the sealing member 24 forms a sealing interface between the flange portion 232 and the wall portion 251.

[0127] In some embodiments, in the thickness direction Z of the wall portion, a portion of the sealing member 24 can be disposed between the flange portion 232 and the wall portion 251, and another portion of the sealing member 24 can extend into the electrode lead-out hole 253. Alternatively, the entire sealing member 24 can be disposed between the flange portion 232 and the wall portion 241.

[0128] The material of the first wall 25 can be a metallic material, or a non-metallic material with high hardness.

[0129] The hardness of the wall portion 251 and the hardness of the electrode terminal 23 mentioned in the present application can be Vickers hardness. The measurement method of Vickers hardness is that a diamond square cone indenter with a load of 120 kg or less and a vertex angle of 136° is pressed into the surface of the material, and the value of the Vickers hardness is obtained by dividing the surface area of the material indentation pit by the load value, and the standard test holding time is 10S-15S.

[0130] In some embodiments, the hardness of the wall portion 251 and the hardness of the connecting portion 252 can be greater than the hardness of the electrode terminal 23, and the material of the wall portion 251 and the material of the connecting portion 252 can be the same or different.

[0131] The hardness of the wall portion 251 is greater than the hardness of the electrode terminal 23, and the wall portion 251 has higher deformation resistance. When the force of the electrode terminal 23 is transmitted to the wall portion 251, the wall portion 251 is not easily deformed.

[0132] According to the battery cell 20 of the embodiments of the present application, the seal 24 is arranged around the electrode lead-out hole 253, and at least a part of the seal 24 is located between the flange portion 232 and the wall portion 251, which can improve the sealing effect between the flange portion 232 and the first wall 25, so as to reduce the risk of electrolyte flowing between the flange portion 232 and the wall portion 251; by designing the hardness of the wall portion 251 to be greater than the hardness of the electrode terminal 23, the wall portion 251 has higher deformation resistance and can resist the force of the electrode terminal 23 transmitted to the wall portion 251, so as to facilitate the wall portion 251 and the connecting portion 252 to clamp the electrode terminal 23 and the seal 24, and the wall portion 251 and the connecting portion 252 to apply better clamping effect to the electrode terminal 23 and the seal 24, so that the sealing interface between the electrode terminal 23 and the wall portion 251 is good, and the reliability of the battery cell 20 is improved.

[0133] According to some embodiments of the present application, the material of the wall portion 251 and the material of the connecting portion 252 are the same.

[0134] In some embodiments, the material of the wall portion 251 and the material of the connecting portion 252 can be metal materials, and the connecting portion 252 and the wall portion 251 can be welded, or the connecting portion 252 and the wall portion 251 can be formed by stamping. In other embodiments, the material of the wall portion 251 and the material of the connecting portion 252 also can be non-metal materials, for example, carbon fiber resin composite materials, and the connecting portion 252 and the wall portion 251 can be formed by molding.

[0135] In the above scheme, the material of the wall portion 251 and the material of the connecting portion 252 are same, which is convenient for processing and manufacturing, for example, the wall portion 251 and the connecting portion 252 can be integrally formed, or the wall portion 251 and the connecting portion 252 can be welded.

[0136] According to some embodiments of the present application, the hardness of the wall portion 251 is H1, satisfying 100HV≤H1≤500HV.

[0137] The hardness H1 of the wall portion 251 can be any one of 100HV, 120HV, 160HV, 220HV, 280HV, 360HV, 420HV or 500HV, or a range between any two of them.

[0138] In the above scheme, the hardness of the wall portion 251 is set to be greater than or equal to 100HV and less than or equal to 500HV. On the one hand, the wall portion 251 has high strength and toughness and is not easy to deform under stress. On the other hand, the wall portion 251 has low processing difficulty and high reliability and durability.

[0139] According to some embodiments of the present application, 150HV≤H1≤350HV.

[0140] The hardness H1 of the wall portion 251 can be any one of 150HV, 180HV, 200HV, 230HV, 250HV, 270HV, 300HV or 350HV, or a range between any two of them.

[0141] In the above scheme, the hardness of the wall portion 251 is greater than or equal to 150HV and less than or equal to 350HV, which further makes the wall portion 251 have high strength and toughness and not easy to deform under stress, and further makes the wall portion 251 have low processing difficulty and high reliability and durability.

[0142] According to some embodiments of the present application, the hardness of the electrode terminal 23 is H2, satisfying 20HV≤H2≤100HV.

[0143] The hardness H2 of the electrode terminal 23 can be any one of 20HV, 30HV, 40HV, 50HV, 60HV, 70HV, 80HV, 90HV or 100HV, or a range between any two of them.

[0144] In the above scheme, the hardness of the electrode terminal 23 is set to be greater than or equal to 20HV and less than or equal to 100HV. On the one hand, the electrode terminal 23 has high strength and is not easy to deform under stress. On the other hand, it is convenient for processing and manufacturing.

[0145] According to some embodiments of the present application, 40HV≤H2≤70HV.

[0146] The hardness H2 of the electrode terminal 23 can be any one of 40HV, 45HV, 50HV, 55HV, 60HV, 65HV or 70HV, or a range between any two of them.

[0147] In the above scheme, when the hardness of the electrode terminal 23 is greater than or equal to 40 HV and less than or equal to 70 HV, the electrode terminal 23 has a higher strength and is less likely to be deformed by force, further facilitating processing and manufacturing.

[0148] According to some embodiments of the present application, the material of the wall portion 251 is steel, titanium alloy or carbon fiber resin composite material.

[0149] The material of the wall portion 251 can be steel, for example, stainless steel or the like. The material of the connecting portion 252 can be the same as that of the wall portion 251, and the wall portion 251 and the connecting portion 252 can be connected by welding or stamping.

[0150] The material of the wall portion 251 can be titanium alloy. The material of the connecting portion 252 can be the same as that of the wall portion 251, and the wall portion 251 and the connecting portion 252 can be connected by welding or stamping.

[0151] The material of the wall portion 251 can be carbon fiber resin composite material. The material of the connecting portion 252 can be the same as that of the wall portion

[0152] In the above scheme, the material of the wall portion 251 is steel, titanium alloy or carbon fiber resin composite, which has a higher hardness and a higher anti-deformation ability, and has a better clamping effect on the electrode terminal 23 and the sealing member 24.

[0153] According to some embodiments of the present application, the material of the shell 21 is steel, titanium alloy or carbon fiber resin composite material.

[0154] In some embodiments, the first wall 25 is the end cover 212, and the materials of the shell 211, the wall portion 251 and the connecting portion 252 are the same.

[0155] The shell 21 adopts the above-mentioned material and has a higher hardness and a higher anti-deformation ability.

[0156] In some embodiments, the material of the first wall 25 is steel, the material of the shell 211 is steel, and the shell 21 is a steel shell.

[0157] Please refer to FIG. 4 and FIG. 5, according to some embodiments of the present application, the connecting portion 252 includes a first section 252a, the first section 252a is located outside the wall portion 251, and at least a part of the flange portion 232 is located between the first section 252a and the wall portion 251 along the thickness direction Z of the wall portion.

[0158] The connecting portion 252 is located outside the wall portion 251, and the connecting portion 252 further comprises a second segment 252b and a third segment 252c, the second segment 252b is connected to the wall portion 251, and the third segment 252c is connected to the second segment 252b and the first segment 252a, and the first segment 252a is further away from the electrode assembly 22 than the second segment 252b along the thickness direction Z of the wall portion (see FIG. 3). The first segment 252a is closer to the central axis Q of the main body portion than the second segment 252b along the radial direction J of the main body portion. When the main body portion 231 is a non-cylinder, the radial direction J of the main body portion refers to the radial direction of the circumscribed circle of the main body portion 231.

[0159] At least a part of the flange portion 232 is located between the first segment 252a and the wall portion 251 along the thickness direction Z of the wall portion, and the first segment 252a and the wall portion 251 can clamp the flange portion 232 to fix the electrode terminal 23 to the wall portion 251 after the electrode terminal 23 is assembled with the first wall 25.

[0160] In the above scheme, the first segment 252a is located outside the wall portion 251, which facilitates the assembly of the electrode terminal 23 with the first wall 25 and reduces the risk of interference of the connecting portion 252 with other components inside the battery monomer 20; the first segment 252a is used to clamp the flange portion 232 with the wall portion 251 to facilitate the restriction of the movement of the electrode terminal 23 along the thickness direction Z of the wall portion.

[0161] According to some embodiments of the present application, the orthographic projection of the first segment 252a and the orthographic projection of the sealing member 24 at least partially overlap on the same projection plane perpendicular to the thickness direction Z of the wall portion.

[0162] The first segment 252a can fully overlap the sealing member 24 along the thickness direction Z of the wall portion, or the first segment 252a can partially overlap the sealing member 24, as shown in FIG. 5. While the connecting portion 252 fixes the electrode terminal 23 to the wall portion 251, the sealing member 24 and the flange portion 232 are clamped by the first segment 252a and the wall portion 251, so that the sealing member 24 forms a sealing interface between the flange portion 232 and the wall portion 251.

[0163] In the above scheme, the orthographic projection of the first segment 252a and the orthographic projection of the first segment 252a at least partially overlap, and the first segment 252a has a better restriction effect on the flange portion 232 to facilitate the absorption of the force of the sealing member 24 acting on the electrode terminal 23 along the thickness direction Z of the wall portion.

[0164] Referring to FIGS. 4 and 5, according to some embodiments of the present application, the battery monomer 20 further comprises a first insulating member 26 arranged along the circumferential direction of the electrode lead-out hole 253, at least a part of the first insulating member 26 is arranged between the electrode terminal 23 and the connecting portion 252, and at least a part of the first insulating member 26 surrounds the electrode terminal 23.

[0165] The first insulating member 26 and the connecting portion 252 are located on the same side of the wall portion 251, for example, the first insulating member 26 and the connecting portion 252 are located on the outer side of the wall portion 251.

[0166] The first insulating member 26 is an electrically insulating member, and the material of the first insulating member 26 can be plastic or rubber, etc., so as to insulate and separate the electrode terminal 23 and the connecting portion 252.

[0167] In some embodiments, a part of the first insulating member 26 is arranged between the electrode terminal 23 and the connecting portion 252, or the entire first insulating member 26 is arranged between the electrode terminal 23 and the connecting portion 252, so as to separate the electrode terminal 23 and the connecting portion 252. For example, the first insulating member 26 can be injection molded between the electrode terminal 23 and the connecting portion 252.

[0168] The first insulating member 26 is arranged around the central axis of the electrode terminal 23, and the first insulating member 26 can be arc-shaped, or the first insulating member can be ring-shaped.

[0169] In some embodiments, the first insulating member 26 can be ring-shaped, and the first insulating member 26 is arranged around the electrode terminal 23, so as to insulate and separate the electrode terminal 23 and the connecting portion 252 at any position in the circumferential direction of the electrode terminal 23.

[0170] In some embodiments, the connecting portion 252 can be ring-shaped, and the inner circumferential surface of the connecting portion 252 forms a through hole; the connecting portion 252 is arranged around the main body portion 231, and a part of the first insulating member 26 and a part of the main body portion 231 are accommodated in the through hole, and along the radial direction J of the main body portion, at least part of the first insulating member 26 is located between the electrode terminal 23 and the connecting portion 252. The central axis of the through hole can coincide with the central axis Q of the main body portion. The central axis Q of the main body portion is the central axis of the electrode terminal 23.

[0171] In the above scheme, the arrangement of the first insulating member 26 can separate the electrode terminal 23 and the connecting portion 252, and reduce the risk of short circuit contact between the electrode terminal 23 and the first wall 25.

[0172] According to some embodiments of the present application, the connecting portion 252 and the first insulating member 26 are both arranged around the electrode terminal 23.

[0173] The connecting portion 252 can be ring-shaped around the central axis of the electrode terminal 23, the first insulating member 26 can also be ring-shaped around the central axis of the electrode terminal 23, and the first insulating member 26 is located between the connecting portion 252 and the electrode terminal 23.

[0174] In the above scheme, the connecting portion 252 is arranged around the electrode terminal 23 and can constrain the electrode terminal 23 at any position in the circumferential direction of the electrode terminal 23; the first insulating member 26 is arranged around the electrode terminal 23 and can separate the electrode terminal 23 and the connecting portion 252 at any position in the circumferential direction of the electrode terminal 23, thereby improving the insulation effect.

[0175] According to some embodiments of the present application, the connecting portion 252 is integrally formed with the wall portion 251.

[0176] The connecting portion 252 and the wall portion 251 are structures made by an integral forming process, such as casting, stamping, molding, milling, etc.

[0177] In the above scheme, the connecting portion 252 is integrally formed with the wall portion 251, which facilitates processing and manufacturing, and the connecting stability of the connecting portion 252 and the wall portion 251 is high.

[0178] Please refer to FIG. 5, according to some embodiments of the present application, the connecting portion 252 and the wall portion 251 are welded to form a first welding mark 254, and the first welding mark 254 is arranged around the electrode terminal 23.

[0179] The connecting portion 252 and the wall portion 251 are connected by welding, so that the connecting portion 252 and the wall portion 251 are firmly connected, for example, the connecting portion 252 and the wall portion 251 can be laser welded.

[0180] The first welding mark 254 is a structure formed after the connecting portion 252 and the wall portion 251 are welded, and the first welding mark 254 is arranged around the electrode terminal 23. When the connecting portion 252 and the wall portion 251 are welded, a circle can be welded around the circumference of the electrode terminal 23 to form a ring-shaped first welding mark 254.

[0181] In the above scheme, the connecting portion 252 and the wall portion 251 are welded, which can improve the connecting stability of the connecting portion 252 and the wall portion 251, and the first welding mark 254 is arranged around the electrode terminal 23, which can improve the connecting reliability of the connecting portion 252 and the wall portion 251.

[0182] Please refer to FIG. 6, which is a structural schematic diagram of an electrode terminal according to some embodiments of the present application. According to some embodiments of the present application, the electrode terminal 23 comprises a first portion 23a and a second portion 23b connected to each other, the first portion 23a and the second portion 23b are stacked along the thickness direction of the first wall 25, the first portion 23a is configured to be electrically connected to the busbar component, the second portion 23b is configured to be electrically connected to the tab 22a (please refer to FIG. 3), the material of the first portion 23a is different from the material of the second portion 23b; the first portion 23a comprises a first main body part 231a and a first flange part 232a, the first flange part 232a protrudes from the peripheral side of the first main body part 231a; the second portion 23b comprises a second main body part 231b and a second flange part 232b, the second flange part 232b protrudes from the peripheral side of the second main body part 231b, the second main body part 231b and the first main body part 231a constitute a main body part 231, the second flange part 232b and the first flange part 232a constitute a flange part 232, along the thickness direction of the first wall 25, the first flange part 232a at least partially overlaps with the second flange part 232b.

[0183] The first portion 23a and the second portion 23b are two portions constituting the electrode terminal 23, the first portion 23a is configured to be electrically connected to the busbar component and the second portion 23b is configured to be electrically connected to the tab 22a, so as to realize the electrical connection between the busbar component and the tab 22a made of different materials.

[0184] The material of the first portion 23a can be the same as the material of the busbar component, so as to facilitate the welding of the first portion 23a and the busbar component and improve the connection firmness of the first portion 23a and the busbar component; the material of the second portion 23b can be the same as the material of the corresponding tab 22a, so as to facilitate the welding of the second portion 23b and the tab 22a and improve the connection firmness of the second portion 23b and the tab 22a.

[0185] The first main body part 231a and the second main body part 231b constitute the main body part 231, the second main body part 231b is connected to the first main body part 231a, for example, the second main body part 231b can be welded, heat fused or connected to the first main body part 231a.

[0186] Along the thickness direction Z of the wall part, the first main body part 231a and the second main body part 231b can be completely overlapped.

[0187] The first main body part 231a and the second main body part 231b can both be cylindrical, and the central axis of the first main body part 231a and the central axis of the second main body part 231b can be coincident.

[0188] The first flange portion 232a protrudes from the periphery of the first main body portion 231a, and the second flange portion 232b protrudes from the periphery of the second main body portion 231b. The first flange portion 232a and the second flange portion 232b constitute the flange portion 232, so that the connecting portion 252 clamps the first flange portion 232a and the second flange portion 232b in cooperation with the wall portion 251, and the connecting portion 252 fixes the electrode terminal 23 to the wall portion 251.

[0189] The second flange portion 232b is connected to the first flange portion 232a, for example, by welding, hot melting, or the like.

[0190] The first flange portion 232a and the second flange portion 232b completely overlap in the thickness direction Z of the wall portion, and have a large connection area.

[0191] In the above scheme, the material of the first portion 23a and the material of the second portion 23b are different, so as to meet the assembly requirements of the electrode terminal 23 and the busbar and the tab 22a by electrically connecting the first portion 23a with the busbar and electrically connecting the second portion 23b with the tab 22a; the second main body portion 231b is connected to the first main body portion 231a to constitute the main body portion 231, and the second flange portion 232b is connected to the first flange portion 232a to constitute the flange portion 232, which is convenient for processing and manufacturing, and makes the electrode terminal 23 have high overall strength.

[0192] According to some embodiments of the present application, the material of the first portion 23a is aluminum, and the material of the second portion 23b is copper.

[0193] In the above scheme, the material of the first portion 23a is aluminum, which is convenient for realizing connection with the busbar, and the material of the second portion 23b is copper, which is convenient for realizing welding with the tab 22a. For example, when the material of the negative tab 22a is copper, the material of the second portion 23b is copper, which is convenient for welding the electrode terminal 23 with the negative tab 22a. The material of the first portion 23a is aluminum, which means that the base material of the first portion 23a is aluminum. For example, the first portion 23a can be pure aluminum or an aluminum alloy.

[0194] According to some embodiments of the present application, the material of the electrode terminal 23 is copper or aluminum.

[0195] In some embodiments, the electrode terminal 23 can be selected according to the material of the tab 22a. For example, when the material of the tab 22a is copper, the material of the electrode terminal 23 corresponding to the tab 22a can be copper; or when the material of the tab 22a is aluminum, the material of the electrode terminal 23 corresponding to the tab 22a can be aluminum.

[0196] In the above scheme, the material of the electrode terminal 23 is copper or aluminum, which has good electrical conductivity and facilitates the transmission of current.

[0197] Please refer to FIG. 3. According to some embodiments of the present application, the shell 21 includes a shell body 211 and an end cover 212. The shell body 211 has an opening, and the end cover 212 covers the opening and is the first wall 25.

[0198] In the above scheme, the end cover 212 is the first wall 25, which facilitates the assembly of the electrode terminal 23 and the first wall 25 and the assembly of the electrode terminal 23 and the electrode assembly 22.

[0199] According to some embodiments of the present application, the battery cell 20 further includes a second insulating member 27. The second insulating member 27 is arranged on the inner side of the wall portion 251, and is used to separate the wall portion 251 and the electrode assembly 22.

[0200] According to some embodiments of the present application, the embodiments of the present application also provide a battery device 100, which includes the battery cell 20 provided by any of the above embodiments.

[0201] According to some embodiments of the present application, the embodiments of the present application also provide a power consumption device, which includes the battery cell 20 or the battery device 100 provided by any of the above embodiments, and the battery cell 20 or the battery device 100 is used to provide electric energy.

[0202] According to some embodiments of the present application, please refer to FIGS. 3-6. The embodiments of the present application provide a battery cell 20, which includes a shell 21, an electrode assembly 22, an electrode terminal 23, a sealing member 24, a first insulating member 26, and a second insulating member 27.

[0203] The shell 21 includes a shell body 211 and an end cover 212. The shell body211 has an opening, and the end cover 212 is connected with the shell body 211 and closes the opening. The end cover 212 is the first wall 25, which includes a wall portion 251 and a connecting portion 252. The wall portion 251 is provided with an electrode lead-out hole 253, and the connecting portion 252 is welded with the wall portion 251 to form a first welding mark 254. The first welding mark 254 is annular.

[0204] The electrode assembly 22 is arranged in the shell 21, and the electrode assembly 22 has a tab 22a.

[0205] The electrode terminal 23 is arranged on the first wall 25, the electrode terminal 23 covers the electrode lead-out hole 253, the electrode terminal 23 comprises a main body part 231 and a flange part 232 protruding from the peripheral side of the main body part 231, part of the main body part 231 is arranged in the electrode lead-out hole 253 and is electrically connected with the tab 22a. The connecting part 252 is annular and is arranged around the peripheral direction of the electrode terminal 23, the flange part 232 is located outside the wall part 251, part of the flange part 232 is arranged between the wall part 251 and the connecting part 252 along the thickness direction Z of the wall part, and the connecting part 252 is used for fixing the electrode terminal 23 to the wall part 251.

[0206] The sealing part 24 is arranged around the electrode lead-out hole 253, and part of the sealing part 24 is located between the flange part 232 and the wall part 251 along the thickness direction Z of the wall part.

[0207] The first insulation part 26 is located outside the wall part 251, the first insulation part 26 is arranged around the electrode terminal 23, and the first insulation part 26 is located between the electrode terminal 23 and the connecting part 252 to separate the electrode terminal 23 and the connecting part 252.

[0208] The second insulation part 27 is located inside the wall part 251, and the second insulation part 27 is used to separate the wall part 251 and the electrode assembly 22.

[0209] The shell 21 is a steel shell. The material of the wall part 251 and the material of the connecting part 252 are both steel, and the hardness of the first wall 25 is greater than the hardness of the electrode terminal 23.

[0210] According to the battery monomer 20 of the embodiment of the application, the flange part 232 is located outside the wall part 251, the flange part 232 cooperates with the main body part 231 to cover the electrode lead-out hole 253, part of the sealing part 24 is located between the flange part 232 and the wall 251, the flange part 232 and the sealing part 24 are clamped by the wall part 251 and the connecting part 252 to form a sealing interface between the flange part 232 and the wall part 251; the material of the wall part 251 and the material of the connecting part 252 are both steel so that the wall part 251 and the connecting part 252 have high deformation resistance, the wall part 251 and the connecting part 252 can provide high clamping force for the flange part 232 and the sealing part 24, which is convenient for restraining the movement of the flange part 232, so that the flange part 232 and the wall part 251 are well sealed, the risk of electrolyte leakage is reduced, and the reliability of the battery monomer 20 is improved.

[0211] Although the present application has been described with reference to preferred embodiments, various modifications can be made to the application without departing from the scope of the application. In particular, the technical features mentioned in the various embodiments can be combined in any way, provided that there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer casing includes a first wall, the first wall including a wall portion and a connecting portion, the wall portion being provided with an electrode lead-out hole, and the connecting portion being connected to the wall portion; An electrode assembly is disposed within the housing, and the electrode assembly has tabs; An electrode terminal is disposed on the first wall, the electrode terminal covers the electrode lead-out hole, the electrode terminal includes a main body and a flange portion protruding from the periphery of the main body, the main body is electrically connected to the tab, at least a portion of the connecting portion is disposed on the outer periphery of the electrode terminal along the thickness direction of the wall, at least a portion of the flange portion is disposed between the wall and the connecting portion, the connecting portion is used to fix the electrode terminal to the wall; A sealing element is disposed around the electrode lead-out hole, and at least a portion of the sealing element is located between the flange and the wall portion along the thickness direction of the wall portion; The hardness of the wall portion is greater than the hardness of the electrode terminal.

2. The battery cell according to claim 1, characterized in that, The material of the wall portion is the same as the material of the connecting portion.

3. The battery cell according to claim 1 or 2, characterized in that, The hardness of the wall is H1, which satisfies 100HV≤H1≤500HV.

4. The battery cell according to claim 3, characterized in that, 150HV≤H1≤350HV.

5. The battery cell according to any one of claims 1-4, characterized in that, The hardness of the electrode terminal is H2, which satisfies 20HV≤H2≤100HV.

6. The battery cell according to claim 5, characterized in that, 40HV≤H2≤70HV.

7. The battery cell according to any one of claims 1-6, characterized in that, The wall is made of steel, titanium alloy, or carbon fiber resin composite material.

8. The battery cell according to any one of claims 1-7, characterized in that, The connecting portion includes a first segment located on the outer side of the wall portion along the thickness direction of the wall portion, and at least a portion of the flange portion is located between the first segment and the wall portion.

9. The battery cell according to claim 8, characterized in that, On the same projection plane perpendicular to the thickness direction of the wall, the orthographic projection of the first segment at least partially overlaps with the orthographic projection of the seal.

10. The battery cell according to any one of claims 1-9, characterized in that, The battery cell also includes: A first insulating member is disposed circumferentially along the electrode lead-out hole, at least a portion of the first insulating member is disposed between the electrode terminal and the connection portion, and at least a portion of the first insulating member is disposed around the electrode terminal.

11. The battery cell according to claim 10, characterized in that, Both the connecting portion and the first insulating member are arranged around the electrode terminal.

12. The battery cell according to any one of claims 1-11, characterized in that, The connecting part is integrally formed with the wall part.

13. The battery cell according to any one of claims 1-11, characterized in that, The connecting portion is welded to the wall portion to form a first weld mark, and the first weld mark is disposed around the electrode terminal.

14. The battery cell according to any one of claims 1-13, characterized in that, The electrode terminal includes a first part and a second part that are connected to each other. The first part and the second part are stacked along the thickness direction of the first wall. The first part is used to be electrically connected to the busbar component, and the second part is used to be electrically connected to the tab. The materials of the first part and the second part are different. The first part includes a first main body portion and a first flange portion, wherein the first flange portion protrudes from the periphery of the first main body portion; The second part includes a second main body portion and a second flange portion. The second flange portion protrudes from the periphery of the second main body portion. The second main body portion and the first main body portion constitute the main body portion. The second flange portion and the first flange portion constitute the flange portion. Along the thickness direction of the first wall, the first flange portion and the second flange portion at least partially overlap.

15. The battery cell according to claim 14, characterized in that, The first part is made of aluminum, and the second part is made of copper.

16. The battery cell according to any one of claims 1-13, characterized in that, The electrode terminals are made of copper or aluminum.

17. The battery cell according to any one of claims 1-16, characterized in that, The housing includes a shell and an end cap, the shell having an opening, the end cap covering the opening, and the end cap being the first wall.

18. The battery cell according to any one of claims 1-17, characterized in that, The outer shell is made of steel, titanium alloy, or carbon fiber resin composite material.

19. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-18.

20. An electrical appliance, characterized in that, Includes a battery cell as described in any one of claims 1-18 or a battery device as described in claim 19, wherein the battery cell or the battery device is used to provide electrical energy.

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