Battery monomer, battery and electric equipment

Abstract

The utility model discloses a battery monomer, a battery and electric equipment. A battery cell includes a housing, an electrode terminal, an electrode assembly, and a first insulator. The housing includes a first wall provided with a terminal hole. At least a portion of the electrode terminal is located within the terminal hole. The electrode assembly is accommodated in the housing and is electrically connected with the electrode terminal. The first insulator is disposed between the first wall and the electrode assembly, and a portion of the first insulator is located between the electrode terminal and the first wall. And the battery monomer further comprises a sealing piece, and the sealing piece is arranged between the electrode terminal and the first insulating piece along the thickness direction of the first wall so as to seal a gap between the electrode terminal and the first insulating piece. According to the technical scheme provided by the invention, the reliability of the battery monomer can be improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and more particularly, to a battery cell, a battery and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the keys to the sustainable development of the automotive industry. Electric vehicles have become an important part of the sustainable development of the automotive industry due to their advantages of energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development.

[0003] In the development of battery technology, in addition to improving the performance of the battery, the reliability of the battery is also an issue that needs to be considered.

[0004] Therefore, how to improve the reliability of the battery is an urgent problem to be solved in battery technology. Summary of the Utility Model

[0005] In view of the above problems, the embodiments of the present application provide a battery cell, a battery and an electrical device, which can improve the reliability of the battery.

[0006] In a first aspect, the embodiments of the present application provide a battery cell, including a housing, an electrode terminal, an electrode assembly and a first insulating member. The housing includes a first wall, and the first wall is provided with a terminal hole. At least a part of the electrode terminal is located in the terminal hole. The electrode assembly is accommodated in the housing and is electrically connected to the electrode terminal. The first insulating member is disposed between the first wall and the electrode assembly, and a part of the first insulating member is located between the electrode terminal and the first wall. Wherein, the battery cell further includes a sealing member, and along the thickness direction of the first wall, the sealing member is disposed between the electrode terminal and the first insulating member to seal the gap between the electrode terminal and the first insulating member.

[0007] In the technical solution of the embodiment of the present application, by disposing the sealing member between the electrode terminal and the first insulating member to seal the gap between the electrode terminal and the first insulating member, when the electrolyte infiltrates into the gap between the electrode terminal and the first insulating member, the movement of the electrolyte towards the terminal hole is restricted, thereby reducing the risk of electrolyte leakage from the terminal hole, and further improving the reliability of the battery cell.

[0008] According to some embodiments of the present application, the battery cell further includes a second insulating member, at least a part of the second insulating member is located in the terminal hole and is disposed around the electrode terminal, and the second insulating member separates the hole wall of the terminal hole and the electrode terminal.

[0009] In the above solution, the second insulating member is used to separate the hole wall of the terminal hole and the electrode terminal, thereby reducing the risk of short circuit of the battery cell caused by the overlap between the electrode terminal and the hole wall of the terminal hole, and further improving the reliability of the battery cell.

[0010] According to some embodiments of the present application, the inner peripheral side of the second insulating member is welded to the electrode terminal to form a first welding portion, and the outer peripheral side of the second insulating member is welded to the hole wall of the terminal hole to form a second welding portion.

[0011] In the above solution, by providing the first welding portion and the second welding portion, the electrode terminal can be connected to the hole wall of the terminal hole in its own radial direction through the second insulating member, so that the electrode terminal does not need to be provided with a connection structure on the side of the first wall away from the electrode assembly to connect to the first wall. Furthermore, the size of the electrode terminal in the thickness direction of the first wall is reduced, thereby reducing the size of the battery cell in the thickness direction of the first wall, and further contributing to improving the energy density of the battery having the battery cell.

[0012] According to some embodiments of the present application, the inner peripheral side of the second insulating member is brazed to the electrode terminal, and the outer peripheral side of the second insulating member is brazed to the hole wall of the terminal hole.

[0013] In the above solution, the inner peripheral side of the second insulating member is brazed to the electrode terminal, and the outer peripheral side of the second insulating member is brazed to the hole wall of the terminal hole, which not only facilitates the formation of the first welding portion and the second welding portion, but also provides sufficient connection force to make the connection between the second insulating member and the electrode terminal and between the first wall and the second insulating member firm.

[0014] According to some embodiments of the present application, the material of the second insulating member is ceramic or glass.

[0015] In the above solution, the material of the second insulating member is ceramic or glass. On the one hand, the second insulating member has good insulation performance, and on the other hand, the insulating member has good high-temperature resistance.

[0016] According to some embodiments of the present application, the terminal hole is a stepped hole. The terminal hole includes a first hole section and a second hole section. Along the axial direction of the terminal hole, the first hole section is located on the side of the second hole section away from the electrode assembly, and the diameter of the first hole section is smaller than that of the second hole section to form a first step surface between the first hole section and the second hole section; the electrode terminal includes a first base body and a second base body, the first base body is located in the first hole section, and the second base body is located in the second hole section.

[0017] In the above solution, by setting the terminal hole as a stepped hole and inserting the electrode terminal into the terminal hole in a matching manner, and making the second base body located in the second hole section, the second base body can abut against the first step surface formed between the first hole section and the second hole section. When the internal pressure of the battery cell increases, the first step surface can limit the second base body from moving away from the electrode assembly in the thickness direction of the first wall, thereby reducing the risk of battery cell open circuit caused by the connection failure between the electrode terminal and the electrode assembly due to excessive movement of the electrode terminal in the thickness direction of the first wall, thus improving the reliability of the battery cell.

[0018] According to some embodiments of the present application, the inner peripheral side of the second insulating member is welded to the first base body, and the outer peripheral side of the second insulating member is welded to the hole wall of the first hole section.

[0019] In the above solution, the inner peripheral side of the second insulating member is welded to the first base body, and the outer peripheral side of the second insulating member is welded to the hole wall of the first hole section to realize the connection between the first base body and the first wall, so that there is no need to provide a connection mechanism between the first base body and the first wall at the end far from the second base body, thereby reducing the size of the electrode terminal in the thickness direction of the first wall, reducing the size of the battery cell in the thickness direction of the first wall, and further contributing to improving the energy density of the battery having the battery cell.

[0020] According to some embodiments of the present application, along the thickness direction of the first wall, a part of the first insulating member is located between the first step surface and the second base body, and the seal is disposed between the first insulating member and the second base body.

[0021] In the above solution, along the thickness direction of the first wall, the seal is disposed between the first insulating member and the second base body, and the first insulating member and the second base body can cooperate with each other to clamp the opposite sides of the first seal in the thickness direction of the first wall, thereby filling the gap between the first insulating member and the second base body, reducing the risk of electrolyte leakage from the terminal hole, and improving the reliability of the battery cell.

[0022] According to some embodiments of the present application, a groove is provided on the second base body, the groove surrounds the first base body, and the groove is used to accommodate at least part of the seal.

[0023] In the above solution, at least part of the seal is accommodated by the groove. When assembling the battery cell, the groove can limit the movement of the seal, facilitating the assembly of the battery cell.

[0024] According to some embodiments of the present application, along the thickness direction of the first wall, the original thickness of the seal is Q, and the size of the groove is H1, satisfying 0.02 ≤ 1 - H1 / Q ≤ 0.5.

[0025] In the above solution, the compression ratio 1 - H1 / Q of the seal is reasonable. When applying the above compression ratio of the seal to the battery cell, the sealing performance of the seal for the gap between the electrode terminal and the first insulating member can be improved.

[0026] According to some embodiments of the present application, 0.2 mm ≤ H1 ≤ 3 mm.

[0027] In the above solution, along the thickness direction of the first wall, the size H1 of the groove is reasonable. When applying the size of the above groove to the battery cell, on the one hand, the sealing performance of the sealant for the gap between the electrode terminal and the first insulating member can be improved; on the other hand, the strength of the second base body can be increased, thereby improving the reliability of the battery cell.

[0028] According to some embodiments of the present application, the second insulating member includes a body portion and an extending portion. The body portion is annular and located in the first hole section. The extending portion protrudes radially from the outer peripheral surface of the body portion along the electrode terminal, and the extending portion is located in the second hole section. Along the thickness direction of the first wall, at least a part of the extending portion is located between the first stepped surface and the second base body.

[0029] In the above solution, along the thickness direction of the first wall, at least a part of the extending portion is located between the first stepped surface and the second base body. When the second base body moves along the thickness direction of the first wall, the extending portion abuts against the second base body to limit the second base body from abutting against the first wall, thereby reducing the risk of internal short circuit of the battery cell caused by the overlap of the second base body and the first wall, and thus improving the reliability of the battery cell.

[0030] According to some embodiments of the present application, along the radial direction of the electrode terminal, the extending portion abuts against the first insulating member.

[0031] In the above solution, along the radial direction of the electrode terminal, the extending portion abuts against the first insulating member. When the second base body moves along the thickness direction of the first wall, both the extending portion and a part of the first insulating member abut against the second base body to limit the second base body from abutting against the first wall, thereby reducing the risk of internal short circuit of the battery cell caused by the overlap of the second base body and the first wall, and thus improving the reliability of the battery cell.

[0032] According to some embodiments of the present application, along the thickness direction of the first wall, the size H2 of the extending portion and the size H3 of the part of the first insulating member located between the first stepped surface and the second base body satisfy H2≤H3.

[0033] In the above solution, along the thickness direction of the first wall, the size H2 of the extending portion and the size H3 of the part of the first insulating member located between the first stepped surface and the second base body satisfy H2≤H3. When assembling the battery cell, the first stepped surface and the second base body first abut against both sides of the part of the first insulating member located between the first stepped surface and the second base body in the thickness direction of the first wall, thereby restricting the movement of the part of the first insulating member located between the first stepped surface and the second base body in the thickness direction of the first wall, and further reducing the risk of leakage from the terminal hole due to the electrolyte entering the gap between the first insulating member and the first stepped surface, and thus improving the reliability of the battery cell.

[0034] According to some embodiments of the present application, the battery further includes an adapter for electrically connecting the tab of the electrode assembly and the electrode terminal. The electrode terminal and the adapter are of an integrally formed structure.

[0035] In the above solution, the electrode terminal and the adapter are of an integrally formed structure. On the one hand, it is convenient for processing the electrode terminal and the adapter; on the other hand, the structural strength at the connection between the electrode terminal and the adapter is improved, thereby enhancing the overall reliability of the battery cell.

[0036] According to some embodiments of the present application, the housing includes a housing body and a cover plate. The housing body has an opening, and the cover plate seals the opening. The first wall is the cover plate, or the first wall is the wall portion of the housing body opposite to the cover plate.

[0037] In the above solution, the design of the opening facilitates accommodating the electrode assembly into the housing body through the opening, and the cover plate seals the opening to form a closed space, thereby providing a stable working environment for the electrode assembly and improving the reliability of the battery cell.

[0038] In a second aspect, embodiments of the present application provide a battery including the battery cell provided in the first aspect embodiments.

[0039] In a third aspect, embodiments of the present application provide an electrical device including the battery provided in the second aspect embodiments. The battery is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0041] Figure 1 Structural schematic diagram of a vehicle provided in some embodiments of the present application;

[0042] Figure 2 Exploded perspective view of a battery provided in some embodiments of the present application;

[0043] Figure 3 Exploded perspective view of a battery cell provided in some embodiments of the present application;

[0044] Figure 4 Structural schematic diagram of the first wall, the first insulating member, the electrode terminal and the seal provided in some embodiments of the present application;

[0045] Figure 5 Cross-sectional view of a battery cell provided in some embodiments of the present application;

[0046] Figure 6 A cross-sectional view of another battery cell provided by some embodiments of the present application;

[0047] Figure 7 is Figure 6 an enlarged view of part A in;

[0048] Figure 8 is Figure 6 an enlarged view of part B in;

[0049] Figure 9 A schematic structural view of a second insulating member provided by some embodiments of the present application;

[0050] Figure 10 A schematic structural view of an adapter and an electrode terminal provided by some embodiments of the present application;

[0051] Figure 11 A three-dimensional exploded view of a housing provided by some embodiments of the present application;

[0052] Figure 12 A three-dimensional exploded view of another housing provided by some embodiments of the present application.

[0053] Icon: 1000 - vehicle;

[0054] 100 - battery; 200 - controller; 300 - motor;

[0055] 10 - box body; 11 - first box body; 12 - second box body;

[0056] 20 - battery cell; 21 - housing; 211 - first wall; 2111 - terminal hole; 2111A - first hole section; 2111B - second hole section; 2111C - first step surface; 212 - shell; 213 - cover plate;

[0057] 22 - electrode terminal; 221 - first base; 222 - second base; 222A - groove; 222B - second step surface; 22A - first electrode terminal; 22B - second electrode terminal;

[0058] 23 - electrode assembly; 231 - tab; 231A - first tab; 231B - second tab; 232 - main body;

[0059] 24 - first insulating member; 241 - first part; 242 - second part;

[0060] 25 - seal;

[0061] 26 - second insulating member; 261 - first welding part; 262 - second welding part; 26A - body part; 26B - extension part;

[0062] 27 - Adapter;

[0063] X - Thickness direction of the first wall; Y - First direction; Z - Second direction. Detailed implementation manners

[0064] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application.

[0065] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application; the terms "including" and "having" and any variations thereof in the specification and claims of the present application and the above drawings are intended to cover non - exclusive inclusion. The terms "first", "second", etc. in the specification and claims of the present application or the above drawings are used to distinguish different objects, rather than to describe a specific order or primary - secondary relationship.

[0066] Referring to "embodiments" in the present application means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase in various positions in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0067] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "attached" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0068] The term "and / or" in the present application is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the associated objects before and after.

[0069] In the embodiments of the present application, the same reference numerals denote the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, etc. of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width, etc. of the integrated device, are only exemplary descriptions and should not constitute any limitation to the present application.

[0070] As used in this application, "a plurality of" means two or more (including two).

[0071] In the embodiments of the present application, the battery cell may be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue use.

[0072] The battery cell includes, but is not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium-metal batteries, sodium-metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0073] 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 embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can reduce the risk of short circuit between the positive and negative electrodes and at the same time allow active ions to pass through.

[0074] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0075] In some embodiments, the electrode assembly is a laminated structure.

[0076] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets are alternately stacked.

[0077] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet is folded to form a plurality of stacked folding segments, and a positive electrode sheet is clamped between adjacent folding segments.

[0078] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folding segments.

[0079] As an example, a plurality of separators may be provided and are respectively disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0080] As an example, the separator may be continuously provided and is disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0081] In some embodiments, the shape of the electrode assembly may be cylindrical, flat, or prismatic, etc.

[0082] In some embodiments, the electrode assembly is provided with tabs, which can conduct the current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0083] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0084] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc.

[0085] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0086] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoro(oxalato)borate, lithium bis(oxalato)borate, lithium difluoro bis(oxalato)phosphate, and lithium tetrafluoro(oxalato)phosphate.

[0087] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether, and crown ether.

[0088] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0089] In some embodiments, the battery can be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0090] In some embodiments, the battery can be a battery pack. The battery pack includes a box body and battery cells, and the battery cells or battery modules are accommodated in the box body.

[0091] In some embodiments, the box body can be part of the chassis structure of a vehicle. For example, part of the box body can form at least part of the floor of the vehicle, or part of the box body can form at least part of the cross beams and longitudinal beams of the vehicle.

[0092] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage electrical cabinet, etc.

[0093] Currently, from the perspective of the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only applied to energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied to electric transportation tools such as electric bicycles, electric motorcycles, and electric vehicles, as well as multiple fields such as military equipment and aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also continuously increasing.

[0094] A battery cell generally includes a housing and an electrode assembly accommodated in the housing. The housing includes a first wall, and a terminal hole through which an electrode terminal passes is formed in the first wall. In order to reduce the risk of electrolyte leakage from the terminal hole, a seal is placed between the electrode terminal and the side of the first wall away from the electrode assembly. The electrode terminal presses the seal on the side of the first wall away from the electrode assembly 23 to fill the gap between the first wall and the electrode terminal as much as possible. However, in the related art, there is no corresponding sealing measure on the inner wall of the housing.

[0095] In view of this, an embodiment of the present application provides a battery cell, and the seal is arranged between the electrode terminal and the first insulating member along the thickness direction of the first wall to seal the gap between the electrode terminal and the first insulating member.

[0096] In the above technical solution, by arranging the seal between the electrode terminal and the first insulating member to seal the gap between the electrode terminal and the first insulating member, when the electrolyte infiltrates into the gap between the electrode terminal and the first insulating member, the movement of the electrolyte towards the terminal hole is restricted, thereby reducing the risk of electrolyte leakage from the terminal hole, and further improving the reliability of the battery cell.

[0097] An embodiment of the present application provides an electrical device using a battery as a power source. The electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy. For example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spaceship, etc.

[0098] For the convenience of description in the following embodiments, an electrical device in an embodiment of the present application is taken as an example of a vehicle for description.

[0099] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, an extended-range vehicle, etc. A battery 100 is disposed inside the vehicle 1000. The battery 100 can be disposed at the bottom of the vehicle 1000, or at the head of the vehicle 1000, or at the tail of the vehicle 1000. The battery 100 can be used to supply power to the vehicle 1000. For example, the battery 100 can be used as an operating power source or a power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0100] In some embodiments of the present application, the battery 100 can not only be used as an operating power source or a power source for the vehicle 1000, but also be used as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0101] Please refer to Figure 2 , Figure 2 which is an exploded perspective view of the battery 100 provided for some embodiments of the present application. The battery 100 includes a box body 10 and battery cells 20. The battery cells 20 are used to be accommodated in the box body 10.

[0102] Among them, the box body 10 is used to provide an assembly space for the battery cells 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12. The first box body 11 and the second box body 12 are covered with each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cells 20. The second box body 12 can be a hollow structure with one end open. The first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12 so that the first box body 11 and the second box body 12 jointly define an assembly space; the first box body 11 and the second box body 12 can also both be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0103] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder, a cuboid, or a cube, etc. Exemplarily, in Figure 2 , the shape of the box body 10 is a cuboid.

[0104] In battery 100, the battery cells 20 disposed in the box 10 can be one or multiple. When there are multiple battery cells 20 disposed in the box 10, the multiple battery cells 20 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection means that there are both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a hybrid connection together, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10. Of course, the battery 100 can also be in the form of multiple battery cells 20 first connected in series, in parallel, or in a hybrid connection to form a battery 100 module, and then multiple battery 100 modules are connected in series, in parallel, or in a hybrid connection to form a whole, and the whole is accommodated in the box 10.

[0105] In some embodiments, the battery 100 may further include other structures. For example, the battery 100 may further include a busbar component for connecting the multiple battery cells 20 to achieve electrical connection among the multiple battery cells 20.

[0106] Among them, each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be in the shape of a cylinder, a prism, or other shapes, etc. Exemplarily, in Figure 2 , the battery cell 20 is a cuboid.

[0107] According to some embodiments of the present application, a battery cell 20 is provided. Please refer to Figure 3 and Figure 4 , and please also refer to Figure 5 and Figure 6 . Figure 3 is a three-dimensional exploded view of the battery cell 20 provided by some embodiments of the present application, Figure 4 is a schematic structural diagram of the first wall 211, the first insulating member 24, the electrode terminal 22, and the seal 25 provided by some embodiments of the present application, Figure 5 and Figure 6 are cross-sectional views of two battery cells 20 provided by some embodiments of the present application.

[0108] The battery cell 20 includes a housing 21, an electrode terminal 22, an electrode assembly 23, and a first insulating member 24. The housing 21 includes a first wall 211, and the first wall 211 is provided with a terminal hole 2111. At least a part of the electrode terminal 22 is located in the terminal hole 2111. The electrode assembly 23 is accommodated in the housing 21 and is electrically connected to the electrode terminal 22. The first insulating member 24 is disposed between the first wall 211 and the electrode assembly 23, and a part of the first insulating member 24 is located between the electrode terminal 22 and the first wall 211. Among them, the battery cell 20 further includes a seal 25. Along the thickness direction X of the first wall, the seal 25 is disposed between the electrode terminal 22 and the first insulating member 24 to seal the gap between the electrode terminal 22 and the first insulating member 24.

[0109] The outer shell 21 is a component for accommodating the electrode assembly 23, and the outer shell 21 can also be used to accommodate an electrolyte, such as an electrolyte solution. In some embodiments, an accommodation cavity is formed inside the outer shell 21 for accommodating the electrode assembly 23.

[0110] In some embodiments, the material of the outer shell 21 can be metal or a combination of metal and non-metal. For example, the outer shell 21 can be made of metal, such as aluminum, copper, iron, aluminum, steel, or aluminum alloy, etc.; or for another example, a part of the outer shell 21 can be made of metal, and the remaining part can be made of non-metal. For example, the first wall 211 can be made of metal, and other parts of the outer shell 21 can be made of non-metal materials.

[0111] The outer shell 21 can be in various shapes, such as a cylindrical body or a prism structure, etc. The shape of the outer shell 21 can be determined according to the specific shape of the electrode assembly 23. For example, if the electrode assembly 23 is a cuboid structure, an outer shell 21 with a cuboid structure can be selected.

[0112] The first wall 211 is a part of the structure of the outer shell 21, and the electrode terminal 22 can be insulatingly mounted on the first wall 211.

[0113] The first wall 211 can be made of a conductive material, such as a metal material. For example, the first wall 211 is made of materials such as aluminum, copper, iron, aluminum, steel, or aluminum alloy.

[0114] In some embodiments, the first wall 211 can be a cover plate of the outer shell 21 (not shown in the figure), and the housing 212 of the outer shell 21 surrounds the edge of the first wall 211.

[0115] In some embodiments, the first wall 211 can be connected to the housing 212 by welding, bonding, clamping, or other connection methods. In some embodiments, the first wall 211 and the housing 212 can be integrally formed.

[0116] The thickness direction X of the first wall can be parallel to the height direction of the battery cell 20, the first direction Y can be parallel to the length direction of the battery cell 20, and the second direction Z can be parallel to the width direction of the battery cell 20.

[0117] The electrode terminal 22 is a component insulatingly mounted on the first wall 211, and the electrode terminal 22 is used for electrically connecting to the electrode assembly 23, so that current flows into or out of the electrode assembly 23 through the electrode terminal 22.

[0118] The terminal hole 2111 can be a through-hole structure opened on the first wall 211 for arranging the electrode terminal 22. The terminal hole 2111 can communicate with the inside of the outer shell 21, so that the electrode terminal 22 can be electrically connected to the electrode assembly 23 accommodated in the outer shell 21.

[0119] Exemplarily, the terminal hole 2111 can be formed by a machining process such as milling and drilling, or can be formed simultaneously with the first wall 211 by an integral molding process such as stamping.

[0120] At least part of the electrode terminal 22 is accommodated in the terminal hole 2111, and part of the electrode terminal 22 can be inserted into the terminal hole 2111; part of the electrode terminal 22 extends from the terminal hole 2111 to the side of the first wall 211 away from the electrode assembly 23, so that the electrical equipment or charging device outside the battery cell 20 can be easily connected to the electrode terminal 22; part of the electrode terminal 22 extends from the terminal hole 2111 to the side of the first wall 211 facing the electrode assembly 23, so that the electrode terminal 22 can be easily connected to the electrode assembly 23.

[0121] In some embodiments, the electrode terminals 22 may be two arranged at intervals on the first wall 211 along the first direction Y, and the two electrode terminals 22 include a first electrode terminal 22A and a second electrode terminal 22B, both of which are components insulated and installed on the first wall 211, and the first electrode terminal 22A and the second electrode terminal 22B are respectively used to electrically connect to the positive electrode and the negative electrode of the electrode assembly 23. So that the current flows into the electrode assembly 23 through the first electrode terminal 22A and flows out of the electrode assembly 23 through the second electrode terminal 22B; or, the current flows into the electrode assembly 23 through the second electrode terminal 22B and flows out of the electrode assembly 23 through the first electrode terminal 22A.

[0122] In some embodiments, the electrode terminal 22 may be a cylindrical structure or a polygonal prism structure.

[0123] In some embodiments, the electrode terminal 22 is made of a metal material, such as aluminum, copper, iron, aluminum, steel, an alloy, or a composite metal.

[0124] In some embodiments, the electrode terminal 22 may be mounted on the first wall 211 via an insulating structure.

[0125] The electrode assembly 23 is a component where an electrochemical reaction occurs in the battery cell 20 .

[0126] The structure of the electrode assembly 23 can be various. For example, the electrode assembly 23 can be a wound structure formed by winding a positive electrode sheet, a separator and a negative electrode sheet. For example, the separator is a separator, and the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0127] In an embodiment where the electrode assembly 23 is a wound structure, the thickness direction X of the first wall may be parallel to the winding axis of the electrode assembly 23 .

[0128] Exemplarily, an electrode assembly 23 can be accommodated inside the housing 21, or multiple electrode assemblies 23 can be accommodated. The multiple electrode assemblies 23 are stacked along the second direction Z.

[0129] In some embodiments, the electrode assembly 23 includes a main body 232 and tab ears 231, where the tab ears 231 include a first tab ear 231A and a second tab ear 231B. Both the first tab ear 231A and the second tab ear 231B are disposed on a side of the main body 232 facing the first wall 211.

[0130] Among them, the main body 232 is the region where a chemical reaction occurs in the electrode assembly 23 within the battery cell 20. The main body 232 is a structure wound by a region of a positive electrode sheet coated with a positive electrode active material layer, a separator, and a region of a negative electrode sheet coated with a negative electrode active material layer, and mainly operates by the movement of metal ions between the positive electrode sheet and the negative electrode sheet with opposite polarities.

[0131] The first tab ear 231A and the second tab ear 231B are parts of the electrode assembly 23 respectively used to guide current into and out of the main body 232. Exemplarily, the first tab ear 231A is used to guide current into the main body 232, and the second tab ear 231B is used to guide current out of the main body 232; or, the second tab ear 231B is used to guide current into the main body 232, and the first tab ear 231A is used to guide current out of the main body 232.

[0132] If the first tab ear 231A is used to input or output the positive electrode of the electrode assembly 23, the first tab ear 231A is a component formed by laminating and connecting regions on the positive electrode sheet where no positive electrode active material layer is coated. Correspondingly, if the second tab ear 231B is used to output or input the negative electrode of the electrode assembly 23, the second tab ear 231B is a component formed by laminating and connecting regions on the negative electrode sheet where no negative electrode active material layer is coated; if the first tab ear 231A is used to output or input the negative electrode of the electrode assembly 23, the first tab ear 231A is a component formed by laminating and connecting regions on the negative electrode sheet where no negative electrode active material layer is coated. Correspondingly, if the second tab ear 231B is used to input or output the positive electrode of the electrode assembly 23, the second tab ear 231B is a component formed by laminating and connecting regions on the positive electrode sheet where no positive electrode active material layer is coated. Exemplarily, in the embodiments of the present application, the first tab ear 231A is used to output or input the negative electrode of the electrode assembly 23, and the second tab ear 231B is used to output or input the positive electrode of the electrode assembly 23.

[0133] Exemplarily, the first tab ear 231A is electrically connected to the first electrode terminal 22A, and the second tab ear 231B is electrically connected to the second electrode terminal 22B.

[0134] The first insulating member 24 is disposed between the first wall 211 and the electrode assembly 23. A part of the first insulating member 24 is located between the electrode terminal 22 and the first wall 211. The first insulating member 24 has insulating properties, capable of insulating and isolating the first wall 211 and the electrode assembly 23, and insulating and isolating the first wall 211 and the electrode terminal 22 in the thickness direction X of the first wall.

[0135] In some embodiments, the first insulating member 24 can be in the shape of a sheet, a plate, or a ring, etc.

[0136] In some embodiments, the first insulating member 24 can be a rubber part, a silica gel part, or a plastic part, etc.

[0137] In some embodiments, the first insulating member 24 is made of an insulating material, such as polypropylene, polyethylene, or other materials with insulating properties.

[0138] The first insulating member 24 can be the lower plastic of the battery cell 20.

[0139] The connection relationship between the first insulating member 24 and the first wall 211 includes, but is not limited to, bonding, snap - fitting, or connecting through other connecting members, etc.

[0140] In some embodiments, one or both of the first wall 211 and the electrode terminal 22 are connected to the first insulating member 24 by injection molding. Exemplarily, the electrode terminal 22 can be placed as an insert in an injection mold, and the material of the first insulating member 24 is injection - molded on the surface of the electrode terminal 22, so that the first insulating member 24 is formed on the surface of the electrode terminal 22. Or, the first wall 211 can be placed as an insert in an injection mold, and the material of the first insulating member 24 is injection - molded on the surface of the first wall 211, so that the first insulating member 24 is formed on the surface of the first wall 211. This not only helps to improve the connection strength between the first insulating member 24 and the electrode terminal 22 and / or the first wall 211, but also helps to improve the molding efficiency of the first insulating member 24.

[0141] The seal 25 is disposed between the electrode terminal 22 and the first insulating member 24 to seal the gap between the electrode terminal 22 and the first insulating member 24.

[0142] In some embodiments, the seal 25 can be in a ring shape adapted to the electrode terminal 22. Exemplarily, in Figure 4 ..., the seal 25 is in a circular ring shape.

[0143] In some embodiments, the seal 25 can be a rubber part, a silica gel part, or a plastic part, etc.

[0144] Exemplarily, in Figure 5 and Figure 6The middle electrode terminal 22 and the first insulating member 24 can extrude the seal member 25 in the thickness direction X of the first wall, so that the seal member 25 deforms to fill the gap between the first insulating member 24 and the electrode terminal 22 in the thickness direction X of the first wall.

[0145] When the internal pressure of the battery cell 20 increases, the electrode terminal 22 is pressured in the direction away from the electrode assembly 23, thereby further pressing the seal member 25, causing the seal member 25 to further deform, so as to more fully fill the gap between the first insulating member 24 and the electrode terminal 22 in the thickness direction X of the first wall, thereby reducing the risk of electrolyte leakage from the terminal hole 2111, and further improving the reliability of the battery cell 20.

[0146] In the above solution, by arranging the seal member 25 between the electrode terminal 22 and the first insulating member 24 to seal the gap between the electrode terminal 22 and the first insulating member 24, when the electrolyte infiltrates into the gap between the electrode terminal 22 and the first insulating member 24, the movement of the electrolyte towards the terminal hole 2111 is restricted, thereby reducing the risk of electrolyte leakage from the terminal hole 2111, and further improving the reliability of the battery cell 20.

[0147] According to some embodiments of the present application, please refer to Figure 4 and continue to refer to Figure 5 and Figure 6 The battery cell 20 further includes a second insulating member 26. At least a part of the second insulating member 26 is located in the terminal hole 2111 and is arranged around the electrode terminal 22. The second insulating member 26 separates the hole wall of the terminal hole 2111 and the electrode terminal 22.

[0148] At least a part of the second insulating member 26 is located in the terminal hole 2111 and is arranged around the electrode terminal 22. The second insulating member 26 separates the hole wall of the terminal hole 2111 and the electrode terminal 22. The second insulating member 26 has insulating properties and can insulate and isolate the hole wall of the terminal hole 2111 and the electrode terminal 22 in the radial direction of the electrode terminal 22.

[0149] In some embodiments, the second insulating member 26 can be annular and adapted to the outer peripheral side of the electrode terminal 22. Exemplarily, in Figure 4 the second insulating member 26 is circular.

[0150] In some embodiments, the second insulating member 26 can be a rubber part, a silica gel part, a plastic part, a ceramic part, a glass part, etc.

[0151] In some embodiments, the second insulating member 26 is made of an insulating material, such as polypropylene, polyethylene and other materials with insulating properties.

[0152] The connection relationship between the second insulating member 26 and the first wall 211 includes, but is not limited to, welding, bonding, snap - fitting, or other connection relationships such as connection through other connection members.

[0153] In the above - mentioned solution, the second insulating member 26 separates the hole wall of the terminal hole 2111 from the electrode terminal 22, thereby reducing the risk of short - circuit of the battery cell 20 caused by the overlap of the electrode terminal 22 and the hole wall of the terminal hole 2111, and further improving the reliability of the battery cell 20.

[0154] According to some embodiments of the present application, please refer to Figure 4 and continue to refer to Figure 5 and Figure 6 The inner peripheral side of the second insulating member 26 is welded to the electrode terminal 22 to form a first welding portion 261, and the outer peripheral side of the second insulating member 26 is welded to the hole wall of the terminal hole 2111 to form a second welding portion 262.

[0155] The first welding portion 261 is the welded mark portion after the inner peripheral side of the second insulating member 26 is welded to the electrode terminal 22, that is, the portion that connects the inner peripheral side of the second insulating member 26 and the electrode terminal 22 together after welding.

[0156] "The inner peripheral side of the second insulating member 26 is welded to the electrode terminal 22 to form a first welding portion 261" can also be understood as the inner peripheral side of the second insulating member 26 is connected to the electrode terminal 22 through the first welding portion 261.

[0157] The second welding portion 262 is the welded mark portion after the outer peripheral side of the second insulating member 26 is welded to the hole wall of the terminal hole 2111, that is, the portion that connects the outer peripheral side of the second insulating member 26 and the hole wall of the terminal hole 2111 together after welding.

[0158] "The outer peripheral side of the second insulating member 26 is welded to the hole wall of the terminal hole 2111 to form a second welding portion 262" can also be understood as the outer peripheral side of the second insulating member 26 is connected to the hole wall of the terminal hole 2111 through the second welding portion 262.

[0159] In the embodiment where the inner peripheral side of the second insulating member 26 is welded to the electrode terminal 22 to form a first welding portion 261 and the outer peripheral side of the second insulating member 26 is welded to the hole wall of the terminal hole 2111 to form a second welding portion 262, since the seal member 25 can limit the entry of the electrolyte into the terminal hole 2111, when the battery 100 is operating normally, the seal member 25 can limit the contact of the electrolyte with the first welding portion 261 and the second welding portion 262, thereby reducing the risk of connection failure between the second insulating member 26 and the electrode terminal 22 and the hole wall of the terminal hole 2111 caused by electrolyte corrosion of the first welding portion 261 and the second welding portion 262, as well as the risk of electrolyte leakage, and improving the reliability of the battery cell 20.

[0160] In some embodiments, there are a plurality of first welding portions 261 that are spaced apart and distributed around the circumferential side of the electrode terminal 22.

[0161] In some embodiments, the first welding portion 261 is in a ring shape that surrounds the circumferential side of the electrode terminal 22 for one circle. Of course, the inner circumferential side of the second insulating member 26 and the electrode terminal 22 are connected through the ring-shaped first welding portion 261, so that the gap between the inner circumferential side of the second insulating member 26 and the electrode terminal 22 can be sealed through the first welding portion 261, thereby restricting the electrolyte from leaving the battery cell 20 through the gap between the inner circumferential side of the second insulating member 26 and the electrode terminal 22.

[0162] In some embodiments, there are a plurality of second welding portions 262 that are spaced apart and distributed around the circumferential side of the second insulating member 26.

[0163] In some embodiments, the second welding portion 262 is in a ring shape that surrounds the circumferential side of the second insulating member 26 for one circle. Of course, the outer circumferential side of the second insulating member 26 and the hole wall of the terminal hole 2111 are connected through the second welding portion 262, so that the gap between the outer circumferential side of the second insulating member 26 and the hole wall of the terminal hole 2111 can be sealed through the second welding portion 262, thereby restricting the electrolyte from leaving the battery cell 20 through the gap between the outer circumferential side of the second insulating member 26 and the hole wall of the terminal hole 2111.

[0164] In the embodiments where both the first welding portion 261 and the second welding portion 262 are in a ring shape, the first welding portion 261 seals the gap between the inner circumferential side of the second insulating member 26 and the electrode terminal 22, and the second welding portion 262 seals the gap between the outer circumferential side of the second insulating member 26 and the hole wall of the terminal hole 2111. When the seal of the seal 25 fails, the first welding portion 261 can restrict the electrolyte from flowing out of the battery cell 20 through the gap between the inner circumferential side of the second insulating member 26 and the electrode terminal 22, and the second welding portion 262 can restrict the electrolyte from flowing out of the battery cell 20 through the gap between the outer circumferential side of the second insulating member 26 and the hole wall of the terminal hole 2111, thereby reducing the risk of electrolyte leakage and further improving the reliability of the battery cell 20.

[0165] In the above solution, by providing the first welding portion 261 and the second welding portion 262, the electrode terminal 22 can be connected to the hole wall of the terminal hole 2111 in its own radial direction through the second insulating member 26, so that the electrode terminal 22 does not need to be provided with a connection structure on the side of the first wall 211 away from the electrode assembly 23 to connect to the first wall 211. Furthermore, the size of the electrode terminal 22 in the thickness direction X of the first wall is reduced, thereby reducing the size of the battery cell 20 in the thickness direction X of the first wall, and further contributing to improving the energy density of the battery 100 having the battery cell 20.

[0166] According to some embodiments of the present application, the inner peripheral side of the second insulating member 26 is brazed to the electrode terminal 22, and the outer peripheral side of the second insulating member 26 is brazed to the hole wall of the terminal hole 2111.

[0167] "The inner peripheral side of the second insulating member 26 is brazed to the electrode terminal 22" means that the heated brazing material is added to the gap between the inner peripheral side of the second insulating member 26 and the electrode terminal 22 to solidify and form the first welding portion 261.

[0168] "The outer peripheral side of the second insulating member 26 is brazed to the hole wall of the terminal hole 2111" means that the heated brazing material is added to the gap between the outer peripheral side of the second insulating member 26 and the hole wall of the terminal hole 2111 to solidify and form the second welding portion 262.

[0169] In the above solution, the inner peripheral side of the second insulating member 26 is brazed to the electrode terminal 22, and the outer peripheral side of the second insulating member 26 is brazed to the hole wall of the terminal hole 2111. This not only facilitates the formation of the first welding portion 261 and the second welding portion 262, but also provides sufficient connection force to firmly connect the second insulating member 26 and the electrode terminal 22, as well as the first wall 211 and the second insulating member 26, improving the reliability of the battery cell 20.

[0170] According to some embodiments of the present application, the material of the second insulating member 26 is ceramic or glass.

[0171] The material of the second insulating member 26 being ceramic or glass may mean that the second insulating member 26 is made of ceramic material or glass material.

[0172] Ceramic material or glass material has insulating ability and certain high-temperature resistance ability, and has a certain strength. The second insulating member 26 made of the above materials can improve the insulating performance of the second insulating member 26, and can also improve the high-temperature resistance performance and strength of the second insulating member 26. At the same time, the above materials also have the advantages of rich sources and easy availability.

[0173] Exemplarily, the second insulating member 26 can also be made of high-temperature resistant insulating materials such as thermosetting resin, so that the second insulating member 26 has good high-temperature resistance ability and insulating ability.

[0174] In the above solution, the material of the second insulating member 26 is ceramic or glass. On the one hand, it makes the second insulating member 26 have good insulating performance, and on the other hand, it makes the insulating member have good high-temperature resistance ability.

[0175] According to some embodiments of the present application, referring to Figure 5 and Figure 6, the terminal hole 2111 is a stepped hole. The terminal hole 2111 includes a first hole section 2111A and a second hole section 2111B. Along the axial direction of the terminal hole 2111, the first hole section 2111A is located on the side of the second hole section 2111B away from the electrode assembly 23. The diameter of the first hole section 2111A is smaller than that of the second hole section 2111B, so as to form a first step surface 2111C between the first hole section 2111A and the second hole section 2111B; the electrode terminal 22 includes a first base body 221 and a second base body 222. The first base body 221 is located in the first hole section 2111A, and the second base body 222 is located in the second hole section 2111B.

[0176] The terminal hole 2111 includes a first hole section 2111A and a second hole section 2111B arranged along the axial direction of the terminal hole 2111. The first hole section 2111A is located on the side of the second hole section 2111B away from the electrode assembly 23, that is, the terminal hole 2111 includes at least two hole sections, namely the first hole section 2111A and the second hole section 2111B, and the second hole section 2111B is closer to the electrode assembly (not shown in the figure) than the first hole section 2111A.

[0177] Exemplarily, the axial direction of the terminal hole 2111 is parallel to the thickness direction X of the first wall.

[0178] The first base body 221 is the part of the electrode terminal 22 located in the first hole section 2111A; the second base body 222 is the part of the electrode terminal 22 located in the second hole section 2111B.

[0179] The cross-sectional shape of the first base body 221 can be various, for example, oval, circular or rectangular, etc. The first hole section 2111A is a shape structure adapted to the first base body 221; the cross-sectional shape of the second base body 222 can be various, for example, oval, circular or rectangular, etc. The second hole section 2111B is a shape structure adapted to the second base body 222.

[0180] In the above solution, by setting the terminal hole 2111 as a stepped hole, and inserting the electrode terminal 22 into the terminal hole 2111 in a matching manner, and making the second base body 222 located in the second hole section 2111B, the second base body 222 can abut against the first step surface 2111C formed between the first hole section 2111A and the second hole section 2111B. When the internal pressure of the battery cell 20 increases, the first step surface 2111C can limit the second base body 222 from moving away from the electrode assembly 23 along the thickness direction X of the first wall, thereby reducing the risk of the battery cell 20 being open-circuited due to the connection failure between the electrode terminal 22 and the electrode assembly (not shown in the figure) caused by the excessive movement of the electrode terminal 22 along the thickness direction X of the first wall, thus improving the reliability of the battery cell 20.

[0181] According to some embodiments of the present application, referring toFigure 5 and Figure 6 , and please refer to Figure 7 , Figure 7 is Figure 6 an enlarged view of part A in . The inner peripheral side of the second insulating member 26 is welded to the first base body 221, and the outer peripheral side of the second insulating member 26 is welded to the hole wall of the first hole section 2111A.

[0182] By providing the first welding portion 261 and the second welding portion 262, the first base body 221 can be connected to the hole wall of the first hole section 2111A in its own radial direction through the second insulating member 26, so that the first base body 221 does not need to be provided with a connecting structure on the side of the first wall 211 away from the electrode assembly (not shown in the figure) to connect to the first wall 211.

[0183] In the above solution, the inner peripheral side of the second insulating member 26 is welded to the first base body 221, and the outer peripheral side of the second insulating member 26 is welded to the hole wall of the first hole section 2111A to realize the connection between the first base body 221 and the first wall 211, so that a connecting mechanism between the first base body 221 and the first wall 211 does not need to be provided at one end of the first base body 221 away from the second base body 222, thereby reducing the size of the electrode terminal 22 in the thickness direction X of the first wall, thereby reducing the size of the battery cell 20 in the thickness direction X of the first wall, and further contributing to improving the energy density of the battery 100 having the battery cell 20.

[0184] According to some embodiments of the present application, refer to Figure 5 and Figure 6 , and refer to Figure 8 , Figure 8 is Figure 6 an enlarged view of part B in . Along the thickness direction X of the first wall, a part of the first insulating member 24 is located between the first step surface 2111C and the second base body 222, and the seal member 25 is provided between the first insulating member 24 and the second base body 222.

[0185] In some embodiments, the first insulating member 24 includes a first part 241 and a second part 242 connected to each other. The first part 241 is disposed in the second hole section 2111B and is located between the first step surface 2111C and the second base body 222. The second part 242 is disposed on the side of the first wall 211 facing the electrode assembly (not shown in the figure), and the second part 242 extends along the hole wall of the second hole section 2111B in a direction away from the electrode assembly (not shown in the figure) to connect to the outer periphery of the first part 241.

[0186] Radially along the electrode terminal 22, the portion of the second part 242 located within the second hole section 2111B is disposed between the second base body 222 and the hole wall of the second hole section 2111B to limit the overlap between the second base body 222 and the hole wall of the second hole section 2111B, thereby reducing the short circuit inside the battery cell 20 caused by the overlap between the second base body 222 and the hole wall of the second hole section 2111B, and thus improving the reliability of the battery cell 20.

[0187] In some embodiments, referring to Figure 5 , along the thickness direction X of the first wall, the seal 25 is clamped between the surface of the second base body 222 facing the first insulating member 24 and the first insulating member 24.

[0188] In some embodiments, referring to Figure 6 and Figure 8 , along the thickness direction X of the first wall, the second base body 222 has a second stepped surface 222B facing the first insulating member 24, and a groove 222A for receiving the seal 25 is formed on the second stepped surface 222B. Along the thickness direction X of the first wall, the seal 25 is clamped between the bottom of the groove 222A and the first insulating member 24.

[0189] In the above solution, along the thickness direction X of the first wall, the seal 25 is disposed between the first insulating member 24 and the second base body 222, and the first insulating member 24 and the second base body 222 can cooperate with each other to clamp the opposite sides of the first seal 25 in the thickness direction X of the first wall, thereby filling the gap between the first insulating member 24 and the second base body 222, reducing the risk of electrolyte leakage from the terminal hole 2111, and improving the reliability of the battery cell 20.

[0190] According to some embodiments of the present application, referring to Figure 6 and Figure 8 , a groove 222A is provided on the second base body 222, the groove 222A surrounds the first base body 221, and the groove 222A is used for receiving at least a part of the seal 25.

[0191] Along the thickness direction X of the first wall, the second base body 222 has a second stepped surface 222B facing the first insulating member 24, and the second stepped surface 222B is recessed toward the electrode assembly (not shown in the figure) to form the groove 222A.

[0192] Exemplarily, the groove 222A can be formed by machining processes such as milling and drilling, or can be formed synchronously with the second base body 222 by an integral forming process such as stamping.

[0193] In some embodiments, along the thickness direction X of the first wall, there is a gap between the second stepped surface 222B and the first insulating member 24.

[0194] In some embodiments, along the thickness direction X of the first wall, the second stepped surface 222B abuts against the first insulating member 24, so that the seal 25 is compressed to the dimension H1 of the groove 222A in the thickness direction of the first wall 211. Thereby, it is convenient to control the dimension of the seal 25 in the first direction Y after being compressed by controlling the dimension H1 of the groove 222A in the thickness direction of the first wall 211. Thus, the risk of electrolyte leakage from the terminal hole 2111 caused by the low sealing performance due to the small compression amount of the seal 25 or the rupture of the seal 25 due to the excessive compression amount of the seal 25 is reduced, and the reliability of the battery cell 20 is improved.

[0195] In the above solution, the groove 222A is used to accommodate at least part of the seal 25. When assembling the battery cell 20, the groove 222A can limit the movement of the seal 25, thereby facilitating the assembly of the battery cell 20.

[0196] According to some embodiments of the present application, along the thickness direction X of the first wall, the original thickness of the seal 25 is Q, and the dimension H1 of the groove 222A satisfies 0.02 ≤ 1 - H1 / Q ≤ 0.5.

[0197] "The original thickness of the seal 25 along the thickness direction X of the first wall" refers to the dimension of the seal 25 in the thickness direction X of the first wall in the natural state when the seal 25 is assembled in the groove 222A and not subjected to external pressure.

[0198] "The dimension of the groove 222A along the thickness direction X of the first wall" can be understood as the distance from the bottom of the groove 222A to the second stepped surface 222B along the thickness direction X of the first wall.

[0199] For the convenience of showing the original thickness of the seal 25, please refer to Figure 8 , in the figure, the original thickness of the seal 25 is marked in a dashed line. It should be noted that the dashed line and the pattern filling are only for the convenience of showing the original thickness of the seal 25 and do not represent any physical meaning.

[0200] It can be understood that 1 - H1 / Q = (Q - H1) / Q, which is used to represent the compression ratio of the seal 25 in the thickness direction X of the first wall.

[0201] Exemplarily, 1 - H1 / Q can be any value among 0.02, 0.1, 0.2, 0.3, 0.4, 0.5 or between any two values.

[0202] When 1 - H1 / Q = 0.02, when the first insulating member 24 deforms due to long-term pressure at the contact with the seal 25, the seal 25 can follow the deformation of the first insulating member 24 and expand, so as to continue to limit the flow of the electrolyte to the terminal hole 2111.

[0203] When 1 - H1 / Q = 0.5, after the seal 25 absorbs the electrolyte and expands, it can still expand radially along the second base body 222, so as to reduce the risk of the seal 25 bursting due to absorbing the electrolyte.

[0204] In the above solution, the compression ratio 1 - H1 / Q of the seal 25 is reasonable. When applying the compression ratio of the above seal 25 to the battery cell 20, the sealing performance of the seal 25 for the gap between the electrode terminal 22 and the first insulating member 24 can be improved.

[0205] According to some embodiments of the present application, 0.2 mm ≤ H1 ≤ 3 mm.

[0206] Exemplarily, H1 can be any value among 0.2, 0.5, 1, 1.5, 2, 2.5, 3 or between any two values.

[0207] In the above solution, along the thickness direction X of the first wall, the size H1 of the groove 222A is reasonable. When applying the size of the above groove 222A to the battery cell 20, on the one hand, the sealing performance of the seal 25 for the gap between the electrode terminal 22 and the first insulating member 24 can be improved; on the other hand, the strength of the second base body 222 can be increased, thereby improving the reliability of the battery cell 20.

[0208] According to some embodiments of the present application, refer to Figure 6 and Figure 7 , and please refer to Figure 9 , Figure 9 FIG. is a schematic structural view of the second insulating member 26 provided by some embodiments of the present application. The second insulating member 26 includes a body portion 26A and an extension portion 26B. The body portion 26A is annular and located in the first hole section 2111A. The extension portion 26B protrudes radially along the electrode terminal 22 from the outer peripheral surface of the body portion 26A, and the extension portion 26B is located in the second hole section 2111B. Along the thickness direction X of the first wall, at least a part of the extension portion 26B is located between the first step surface 2111C and the second base body 222.

[0209] The body portion 26A is the part of the second insulating member 26 that is arranged between the first base body 221 and the hole wall of the first hole section 2111A along the radial direction of the electrode terminal 22.

[0210] In an embodiment where the battery cell 20 includes a first welding portion 261 and a second welding portion 262, the inner peripheral side of the body portion 26A is welded to the electrode terminal 22 to form the first welding portion 261, and the outer peripheral side of the body portion 26A is welded to the hole wall of the terminal hole 2111 to form the second welding portion 262.

[0211] The extension portion 26B is the part of the second insulating member 26 that is located in the second hole section 2111B.

[0212] In some embodiments, the extension portion 26B can be connected to the main body portion 26A by bonding, snap - fitting or other connection means.

[0213] In some embodiments, the main body portion 26A and the extension portion 26B can be integrally formed.

[0214] "Along the thickness direction X of the first wall, at least a part of the extension portion 26B is located between the first stepped surface 2111C and the second base body 222" can be understood as that the diameter of the outer peripheral side of the extension portion 26B is larger than the diameter of the first hole section 2111A, so that at least a part of the extension portion 26B is located between the first stepped surface 2111C and the second base body 222 in the thickness direction X of the first wall.

[0215] In some embodiments, the side surface of the extension portion 26B facing away from the electrode assembly (not shown in the figure) abuts against the first stepped surface 2111C to structurally limit the first wall 211. Further, when the first wall 211 moves towards the electrode assembly 23, the stress points between the second insulating member 26 and the first wall 211 are increased, thereby reducing the risk of damage to the second welding portion 262.

[0216] In the above - mentioned solution, along the thickness direction X of the first wall, at least a part of the extension portion 26B is located between the first stepped surface 2111C and the second base body 222. When the second base body 222 moves along the thickness direction X of the first wall, the extension portion 26B abuts against the second base body 222 to limit the second base body 222 from abutting against the first wall 211, thereby reducing the risk of internal short - circuit of the battery cell 20 caused by the overlap of the second base body 222 and the first wall 211, and thus improving the reliability of the battery cell 20.

[0217] According to some embodiments of the present application, referring to Figure 6 、 Figure 7 and Figure 8 , along the radial direction of the electrode terminal 22, the extension portion 26B abuts against the first insulating member 24.

[0218] In some embodiments, a through - hole penetrating the first insulating member 24 along the thickness direction X of the first wall is formed in the first part 241, the extension portion 26B is located in the through - hole, and the circumferential side of the extension portion 26B facing away from the main body portion 26A abuts against the hole wall of the through - hole.

[0219] In the above solution, along the radial direction of the electrode terminal 22, the extension portion 26B abuts against the first insulating member 24. When the second base body 222 moves in the thickness direction X of the first wall, both the extension portion 26B and a part of the first insulating member 24 abut against the second base body 222 to limit the second base body 222 from abutting against the first wall 211, thereby reducing the risk of internal short circuit of the battery cell 20 caused by the overlap between the second base body 222 and the first wall 211, and thus improving the reliability of the battery cell 20.

[0220] According to some embodiments of the present application, along the thickness direction X of the first wall, the dimension H2 of the extension portion 26B and the dimension H3 of the portion of the first insulating member 24 located between the first stepped surface 2111C and the second base body 222 satisfy H2 ≤ H3.

[0221] The "dimension of the portion of the first insulating member 24 located between the first stepped surface 2111C and the second base body 222 along the thickness direction X of the first wall" can be understood as the dimension of the first portion 241 in the thickness direction X of the first wall.

[0222] In the above solution, along the thickness direction X of the first wall, the dimension H2 of the extension portion 26B and the dimension H3 of the portion of the first insulating member 24 located between the first stepped surface 2111C and the second base body 222 satisfy H2 ≤ H3. When the battery cell 20 is assembled, the first stepped surface 2111C and the second base body 222 first abut against both sides of the first portion 241 in the thickness direction of the first wall 211, thereby restricting the movement of the first portion 241 in the thickness direction of the first wall 211, and further reducing the risk of leakage from the terminal hole 2111 due to the electrolyte entering the gap between the first insulating member 24 and the first stepped surface 2111C, thus improving the reliability of the battery cell 20.

[0223] According to some embodiments of the present application, refer to Figure 10 , Figure 10 is a schematic structural diagram of the adapter and the electrode terminal 22 provided by some embodiments of the present application. The battery 100 further includes an adapter 27 for electrically connecting the tab 231 of the electrode assembly 23 and the electrode terminal 22. The electrode terminal 22 and the adapter 27 are of an integrally formed structure.

[0224] The adapter 27 is a component disposed between the tab 231 and the first wall 211, and the electrical connection between the tab 231 and the electrode terminal 22 can be achieved through the adapter 27. The adapter 27 is made of a conductive material. For example, the material of the adapter 27 can be copper, iron, aluminum, steel, stainless steel, nickel steel, or aluminum alloy, etc. The connection relationship between the adapter 27 and the tab 231 includes but is not limited to welding, bonding, clamping, or other connection relationships through other connection members. The connection relationship between the adapter 27 and the electrode terminal 22 includes but is not limited to welding, bonding, clamping, or other connection relationships through other connection members.

[0225] In an embodiment where there are two electrode terminals 22, there are two adapters 27 corresponding to the electrode terminals 22. The two adapters 27 include a first adapter (not shown in the figure) and a second adapter (not shown in the figure). The first adapter (not shown in the figure) electrically connects the first tab (not shown in the figure) and the first electrode terminal (not shown in the figure), and the second adapter (not shown in the figure) electrically connects the second tab (not shown in the figure) and the second electrode terminal (not shown in the figure).

[0226] The electrode terminal 22 and the adapter 27 are an integrally formed structure, which may refer to that the electrode terminal 22 and the adapter 27 are made by an integrally formed processing method such as stamping.

[0227] In the above solution, the electrode terminal 22 and the adapter 27 are an integrally formed structure. On the one hand, it is convenient for the processing of the electrode terminal 22 and the adapter; on the other hand, the structural strength at the connection between the electrode terminal 22 and the adapter 27 is improved, thereby improving the overall reliability of the battery cell 20.

[0228] According to some embodiments of the present application, please refer to Figure 11 and Figure 12 , Figure 11 and Figure 12 are exploded perspective views of two housings 21 provided in some embodiments of the present application. The housing 21 includes a housing body 212 and a cover plate 213. The housing body 212 has an opening, and the cover plate 213 seals the opening. The first wall 211 is the cover plate 213, or the first wall 211 is the wall portion of the housing body 212 opposite to the cover plate 213.

[0229] The housing body 212 is a component for accommodating the electrode assembly 23.

[0230] The cover plate 213 is a component that covers the opening of the housing body 212 to isolate the internal environment of the battery cell 20 from the external environment.

[0231] It can be understood that the shape of the cover plate 213 can be adapted to the shape of the housing 212. For example, if the housing 212 is a cuboid structure, the cover plate 213 is a rectangular plate-like structure adapted to the housing 212. The material of the cover plate 213 can also be various, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the cover plate 213 can be the same as or different from the material of the housing 212.

[0232] It can be understood that with reference to Figure 11 , the first wall 211 can be the cover plate 213; or, with reference to Figure 12 , the first wall 211 can also be the wall part of the housing 212 opposite to the cover plate 213.

[0233] In the above solution, the design of the opening facilitates accommodating the electrode assembly 23 into the housing 212 through the opening, and the cover plate 213 seals the opening to form a sealed space, thereby providing a stable working environment for the electrode assembly 23 and improving the reliability of the battery cell 20.

[0234] Among them, with reference to Figure 2 as shown, the battery 100 may further include a box body 10, and the battery cell 20 is accommodated in the box body 10.

[0235] In some embodiments, the box body 10 may include a first box body 11 and a second box body 12. The first box body 11 and the second box body 12 are covered with each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cell 20.

[0236] Optionally, the second box body 12 may be a hollow structure with one end open, and the first box body 11 may be a plate-like structure. The first box body 11 covers the open side of the second box body 12 so that the first box body 11 and the second box body 12 jointly define the assembly space; the first box body 11 and the second box body 12 may also both be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0237] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder or a cuboid, etc. Exemplarily, in Figure 2 , the box body 10 is a cuboid structure.

[0238] Optionally, the number of battery cells 20 disposed in the box body 10 can be one or more. Exemplarily, in Figure 2In it, multiple battery cells 20 are arranged inside the box body 10 of the battery 100. The multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection together, and then the whole formed by the multiple battery cells 20 is accommodated inside the box body 10.

[0239] Among them, the battery 100 can also include other structures. For example, the battery 100 can also include a busbar component that connects the multiple battery cells 20 to achieve electrical connection among the multiple battery cells 20.

[0240] It should be noted that in some embodiments, the battery 100 may not be provided with the box body 10. The battery 100 includes multiple battery cells 20, and the battery 100 composed of the multiple battery cells 20 can be directly assembled to the electrical device to provide electrical energy for the electrical device through the multiple battery cells 20. That is to say, the box body 10 can be a part of the electrical device. Taking the vehicle 1000 as an example of the electrical device, the box body 10 can be a part of the chassis structure of the vehicle 1000. For example, a part of the box body 10 can become at least a part of the floor of the vehicle 1000, or a part of the box body 10 can become at least a part of the crossbeam and longitudinal beam of the vehicle 1000.

[0241] According to some embodiments of the present application, some embodiments of the present application also provide an electrical device. The electrical device includes the battery cell 20 provided above, and the battery cell 20 is used to provide electrical energy.

[0242] According to some embodiments of the present application, a battery cell 20 is provided. Please refer to Figures 3 - 12 . The battery cell 20 includes a housing 21, an electrode terminal 22, an electrode assembly 23, and a first insulating member 24.

[0243] The housing 21 includes a first wall 211. The housing 21 includes a housing body 212 and a cover plate 213. The housing body 212 has an opening, and the cover plate 213 seals the opening. Among them, refer to Figure 11 , the first wall 211 can be the cover plate 213; or, refer to Figure 12 , the first wall 211 can also be the wall portion of the housing body 212 opposite to the cover plate 213.

[0244] The thickness direction X of the first wall is parallel to the height direction of the battery cell 20, the first direction Y is parallel to the length direction of the battery cell 20, and the second direction Z is parallel to the width direction of the battery cell 20.

[0245] The first wall 211 is provided with a terminal hole 2111. The terminal hole 2111 is a stepped hole, which includes a first hole section 2111A and a second hole section 2111B. Along the axial direction of the terminal hole 2111, the first hole section 2111A is located on the side of the second hole section 2111B away from the electrode assembly 23. The diameter of the first hole section 2111A is smaller than that of the second hole section 2111B, so as to form a first stepped surface 2111C between the first hole section 2111A and the second hole section 2111B.

[0246] The electrode terminal 22 includes a first base body 221 and a second base body 222. The first base body 221 is located in the first hole section 2111A, and the second base body 222 is located in the second hole section 2111B.

[0247] The first insulating member 24 includes a first part 241 and a second part 242 which are connected to each other. The first part 241 is disposed in the second hole section 2111B and is located between the first stepped surface 2111C and the second base body 222. The second part 242 is disposed on the side of the first wall 211 facing the electrode assembly 23. The second part 242 extends along the hole wall of the second hole section 2111B in a direction away from the electrode assembly 23 to connect with the outer periphery of the first part 241.

[0248] Referring to Figure 6 and Figure 8 , along the thickness direction X of the first wall, the second base body 222 has a second stepped surface 222B facing the first insulating member 24. A groove 222A for accommodating the seal 25 is formed on the second stepped surface 222B. Along the thickness direction X of the first wall, the seal 25 is clamped between the bottom of the groove 222A and the first insulating member 24.

[0249] Along the thickness direction X of the first wall, the second stepped surface 222B abuts against the first insulating member 24, so that the seal 25 is compressed to the dimension H1 of the groove 222A in the thickness direction of the first wall 211. Thus, it is convenient to control the dimension of the seal 25 in the first direction Y after being compressed by controlling the dimension H1 of the groove 222A in the thickness direction of the first wall 211. Thereby, the risk of electrolyte leakage from the terminal hole 2111 caused by the low sealing performance due to the small compression amount of the seal 25 or the rupture of the seal 25 due to the excessive compression amount of the seal 25 is reduced, and the reliability of the battery cell 20 is improved.

[0250] Along the thickness direction X of the first wall, the original thickness of the seal 25 is Q, and the dimension H1 of the groove 222A satisfies 0.02 ≤ 1 - H1 / Q ≤ 0.5, and 0.2 mm ≤ H1 ≤ 3 mm.

[0251] The battery cell 20 further includes a second insulating member 26, and the material of the second insulating member 26 is ceramic or glass.

[0252] The second insulating member 26 includes a main body portion 26A and an extending portion 26B. The main body portion 26A is annular and located in the first hole section 2111A, and is wound around the circumferential side of the electrode terminal 22. The inner circumferential side of the main body portion 26A is welded to the electrode terminal 22 to form a first welding portion 261, and the outer circumferential side of the main body portion 26A is welded to the hole wall of the terminal hole 2111 to form a second welding portion 262.

[0253] The first welding portion 261 seals the gap between the inner circumferential side of the second insulating member 26 and the electrode terminal 22, and the second welding portion 262 seals the gap between the outer circumferential side of the second insulating member 26 and the hole wall of the terminal hole 2111. When the seal of the seal member 25 fails, the first welding portion 261 can limit the electrolyte from flowing out of the battery cell 20 through the gap between the inner circumferential side of the second insulating member 26 and the electrode terminal 22, and the second welding portion 262 can limit the electrolyte from flowing out of the battery cell 20 through the gap between the outer circumferential side of the second insulating member 26 and the hole wall of the terminal hole 2111, thereby reducing the risk of electrolyte leakage and further improving the reliability of the battery cell 20.

[0254] The extending portion 26B protrudes radially from the outer circumferential surface of the main body portion 26A along the electrode terminal 22, and the extending portion 26B is located in the second hole section 2111B. Along the thickness direction X of the first wall, at least a part of the extending portion 26B is located between the first stepped surface 2111C and the second base body 222. A through hole penetrating the first insulating member 24 along the thickness direction X of the first wall is formed in the first part 241, the extending portion 26B is located in the through hole, and the circumferential side of the extending portion 26B facing away from the main body portion 26A abuts against the hole wall of the through hole.

[0255] Along the thickness direction X of the first wall, the dimension H2 of the extending portion 26B and the dimension H3 of the portion of the first insulating member 24 located between the first stepped surface 2111C and the second base body 222 satisfy H2≤H3.

[0256] In the above solution, by disposing the seal member 25 between the electrode terminal 22 and the first insulating member 24 to seal the gap between the electrode terminal 22 and the first insulating member 24, on the one hand, when the electrolyte infiltrates into the gap between the electrode terminal 22 and the first insulating member 24, the movement of the electrolyte towards the terminal hole 2111 is restricted, thereby reducing the risk of electrolyte leakage from the terminal hole 2111 and further improving the reliability of the battery cell 20; on the other hand, when the battery cell 20 is operating normally, the seal member 25 can limit the contact between the electrolyte and the first welding portion 261 and the second welding portion 262, thereby reducing the risk of connection failure between the second insulating member 26 and the electrode terminal 22 and the hole wall of the terminal hole 2111 caused by electrolyte corrosion of the first welding portion 261 and the second welding portion 262, as well as the risk of electrolyte leakage, and improving the reliability of the battery cell 20.

[0257] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments may be combined with each other.

[0258] The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: The housing comprises a first wall, wherein the first wall is provided with a terminal hole; an electrode terminal, at least a portion of which is located in the terminal hole; an electrode assembly, contained in the housing and electrically connected to the electrode terminal; A first insulating member, disposed between the first wall and the electrode assembly, wherein a portion of the first insulating member is located between the electrode terminal and the first wall; The battery cell further includes a sealing member, which is disposed between the electrode terminal and the first insulating member along a thickness direction of the first wall to seal a gap between the electrode terminal and the first insulating member.

2. The battery cell according to claim 1, characterized in that: The battery cell further includes a second insulating member, at least a portion of which is located in the terminal hole and is disposed around the electrode terminal, and the second insulating member separates a hole wall of the terminal hole from the electrode terminal.

3. The battery cell according to claim 2, characterized in that: The inner circumference of the second insulating member is welded to the electrode terminal to form a first welding portion, and the outer circumference of the second insulating member is welded to the hole wall of the terminal hole to form a second welding portion.

4. The battery cell according to claim 3, characterized in that: The inner peripheral side of the second insulating member is connected to the electrode terminal by soldering, and the outer peripheral side of the second insulating member is connected to the hole wall of the terminal hole by soldering.

5. The battery cell according to claim 4, characterized in that: The second insulating member is made of ceramic or glass.

6. The battery cell according to claim 3, characterized in that: The terminal hole is a stepped hole, comprising a first hole segment and a second hole segment, wherein along the axial direction of the terminal hole, the first hole segment is located on a side of the second hole segment away from the electrode assembly, and the diameter of the first hole segment is smaller than the diameter of the second hole segment, so as to form a first step surface between the first hole segment and the second hole segment; The electrode terminal includes a first substrate and a second substrate, wherein the first substrate is located in the first hole section, and the second substrate is located in the second hole section.

7. The battery cell according to claim 6, characterized in that: The inner circumference of the second insulating member is welded to the first substrate, and the outer circumference of the second insulating member is welded to the hole wall of the first hole segment.

8. The battery cell according to claim 6, characterized in that: Along the thickness direction of the first wall, a portion of the first insulating member is located between the first step surface and the second base, and the sealing member is disposed between the first insulating member and the second base.

9. The battery cell according to claim 6, characterized in that: The second substrate is provided with a groove, the groove is arranged around the first substrate, and the groove is used to accommodate at least a part of the sealing component.

10. The battery cell according to claim 9, characterized in that: Along the thickness direction of the first wall, the original thickness of the seal is Q, and the size H1 of the groove satisfies 0.02≤1-H1 / Q≤0.

5.

11. The battery cell according to claim 10, characterized in that: 0.2mm≤H1≤3mm.

12. The battery cell according to claim 6, characterized in that: The second insulating member comprises a main body and an extension, wherein the main body is annular and is located in the first hole section, the extension protrudes from the outer circumferential surface of the main body along the radial direction of the electrode terminal, and the extension is located in the second hole section; Along the thickness direction of the first wall, at least a portion of the extension portion is located between the first step surface and the second base.

13. The battery cell according to claim 12, characterized in that: The extending portion abuts against the first insulating member along a radial direction of the electrode terminal.

14. The battery cell according to claim 12, characterized in that: Along the thickness direction of the first wall, a dimension H2 of the extension portion and a dimension H3 of a portion of the first insulating member located between the first step surface and the second base satisfy H2≤H3.

15. The battery cell according to claim 1, characterized in that: The battery further comprises a connecting piece for electrically connecting the tab of the electrode assembly and the electrode terminal; The electrode terminal and the adapter are an integrally formed structure.

16. The battery cell according to any one of claims 1 to 15, characterized in that: The housing comprises a shell and a cover plate, the shell has an opening, and the cover plate covers the opening; The first wall is the cover plate, or the first wall is a wall portion of the housing opposite to the cover plate.

17. A battery, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 16.

18. An electrical equipment, characterized in that: Comprising a battery as claimed in claim 17, the battery is used to provide electrical energy.

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