Battery cell, battery device, and electric device

Abstract

The application discloses a battery monomer, a battery device and an electric equipment. The battery monomer comprises a shell, an electrode assembly, an electrolyte and a hydrogen absorption assembly. The shell has a containing cavity, and the electrode assembly is arranged in the containing cavity. The electrode assembly is arranged in the containing cavity, and the electrode assembly comprises a negative electrode sheet, the negative electrode sheet comprises a negative electrode current collector and a negative electrode active material layer arranged on at least one side of the negative electrode current collector, and the negative electrode active material layer comprises a single substance of an active metal. The electrolyte comprises an electrolyte salt and a solvent, and the solvent comprises at least one of an ether solvent or an ester solvent. The hydrogen absorption assembly is arranged in the containing cavity and comprises a hydrogen absorption piece and an insulation piece, the hydrogen absorption piece is arranged between the electrode assembly and the shell, and the hydrogen absorption piece is used for absorbing at least part of hydrogen in the containing cavity. The hydrogen absorption piece absorbs the gas generated in the operation of the electrode assembly, so that the deformation of the shell caused by the expansion of the gas is reduced. The insulation piece insulates the hydrogen absorption piece and the shell, and the stability of the operation of the battery monomer is improved.

Description

Technical Field

[0001] This application relates to the field of batteries, and in particular to a battery cell, a battery device, and an electrical appliance. Background Technology

[0002] With the development of new energy technologies, batteries are being used more and more widely, such as in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, and power tools.

[0003] The development of battery technology must take into account multiple design factors. Improving the stability of a single battery cell during operation is a research direction in the battery field. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device that can absorb hydrogen gas generated during the operation of the battery cell and improve the stability of the battery cell operation.

[0005] In a first aspect, this application provides a battery cell, including a casing, an electrode assembly, an electrolyte, and a hydrogen absorption assembly. The casing has a receiving cavity and includes two encapsulation films disposed opposite each other, the two encapsulation films being interconnected and enclosing the receiving cavity. The electrode assembly is disposed within the receiving cavity and includes a negative electrode sheet. The negative electrode sheet includes a negative current collector and a negative active material layer disposed on at least one side of the negative current collector, the negative active material layer including an elemental active metal. The electrolyte is contained within the receiving cavity and includes an electrolyte salt and a solvent, the solvent including at least one of ether solvents or ester solvents. The hydrogen absorption assembly is disposed within the receiving cavity and includes a hydrogen absorption element and an insulating element, the hydrogen absorption element being disposed between the electrode assembly and the casing, the hydrogen absorption element being used to absorb at least a portion of the hydrogen gas within the receiving cavity.

[0006] In the technical solution of this application embodiment, the electrode assembly is protected by a shell, reducing the impact of external impurities and moisture on the electrode assembly. The hydrogen-absorbing component in the hydrogen-absorbing assembly can effectively alleviate the phenomenon of gas accumulation inside the battery cell caused by the accumulation of gas inside the shell when the electrode assembly with active metals is used in ether or ester electrolytes. This effectively reduces the occurrence of bulging or deformation of the battery cell during use, thereby reducing the risk of connection failure or leakage of the shell during use, and improving the service life and reliability of the battery cell. Furthermore, the insulating component in the hydrogen-absorbing assembly insulates the hydrogen-absorbing component from the shell, reducing the risk of short circuit or leakage caused by energizing the hydrogen-absorbing component and the shell, and improving the operational stability of the battery cell.

[0007] In some embodiments, the encapsulation film includes a metal layer, a connecting layer, and an insulating layer. The connecting layer is disposed on one surface of the metal layer, and the insulating layer is disposed on the other surface of the metal layer opposite to the connecting layer. The connecting layers of two encapsulation films are disposed opposite each other and connected to form an encapsulation region. The encapsulation region surrounds the electrode assembly and includes a first encapsulation portion and a second encapsulation portion extending along a first direction, and a third encapsulation portion and a fourth encapsulation portion extending along a second direction. The first direction is perpendicular to the second direction. The first encapsulation portion, the third encapsulation portion, the second encapsulation portion, and the fourth encapsulation portion are sequentially connected end to end and arranged circumferentially along the electrode assembly. At least a portion of the hydrogen absorption assembly is disposed within the encapsulation region. In the above structure, the metal layer is used to provide structural support for the encapsulation film, improving the structural strength and toughness of the encapsulation film. The connecting layer is used to connect the two encapsulation films, improving the connection strength and sealing performance of the encapsulation film. The insulating layer is used to insulate the outer shell, reducing the risk of short circuit between two adjacent battery cells. The fourth encapsulation portion can form a structurally regular encapsulation region, improving the encapsulation efficiency and sealing performance. By placing the hydrogen absorption component within the encapsulation area, the hydrogen gas inside the containment cavity can be absorbed, reducing the risk of shell deformation caused by hydrogen accumulation within the encapsulation area.

[0008] In some embodiments, the electrode assembly includes a main body and a tab extending from the main body, with at least a portion of the hydrogen absorption assembly connected to the surface of the tab, and / or at least a portion of the hydrogen absorption element connected to the main body. In the above structure, placing the hydrogen absorption element on the tab can fully utilize the space between the tab and the housing, reduce the accumulation of gas near the tab, reduce the risk of housing deformation at the tab, and improve the operational stability of the battery cell.

[0009] In some embodiments, the tab extends from one side of the body portion along a second direction, and the battery cell also includes an electrode terminal. The electrode terminal is welded to the tab to form a weld portion, and the end of the electrode terminal extends away from the body portion along the second direction to the outside of the housing. A hydrogen absorption assembly is disposed on at least one surface of the tab and is located between the weld portion and the body portion. In the above structure, disposing the hydrogen absorption component in the space between the weld portion and the body portion reduces the risk of interference between the hydrogen absorption component and the electrode terminal, and improves the connection stability between the electrode terminal and the tab.

[0010] In some embodiments, the hydrogen absorption element is disposed on the surface of the electrode tab. The above structure, by attaching the getter material to the surface of the electrode tab through a coating, improves the connection strength and stability between the hydrogen absorption element and the electrode tab, thereby enhancing the stability of the getter process.

[0011] In some embodiments, an insulating element is disposed on the surface of the encapsulation film facing the hydrogen-absorbing element. In the above structure, disposing the insulation on the encapsulation film can improve the connection strength between the insulating element and the housing, while also improving the insulation protection performance.

[0012] In some embodiments, the hydrogen absorption component includes a suction bag and suction particles. The suction bag has multiple vents. The suction particles are disposed inside the suction bag, and the minimum particle size of the suction particles is larger than the maximum vent diameter. In the above structure, by providing a suction bag to enclose the suction particles, the manufacturing and assembly of the hydrogen absorption component is facilitated. By providing multiple suction holes, the suction particles can easily absorb gas from the containment cavity.

[0013] In some embodiments, the intake bag is made of insulating material to form an insulating component. The above-described structure, using insulating material to manufacture the intake bag, can accommodate the intake material while simultaneously achieving insulation between the hydrogen absorption component and the outer casing and electrode assembly. This simplifies the structure of the hydrogen absorption component, reduces the space occupied by the hydrogen absorption component, and improves the energy density of the battery cell.

[0014] In some embodiments, the insulating element includes an insulating sheet and an adhesive layer. The adhesive layer includes a first segment attached to the main body, a second segment attached to the hydrogen-absorbing element, and a third segment attached to the electrode tab. The insulating element is connected to the first, second, and third segments respectively. In the above structure, by providing the adhesive layer, the adhesive layer is bonded to the main body, the hydrogen-absorbing element, and the electrode tab respectively, thereby improving the connection strength between the insulating element and the electrode assembly. Simultaneously, the insulating sheet is also connected to the first, second, and third segments of the adhesive layer respectively, further increasing the creepage distance between the hydrogen-absorbing element and the housing, and improving the insulation effect of the insulating element.

[0015] In some embodiments, the electrode assembly includes an electrode sheet and a separator membrane, which are arranged along a winding direction. The electrode sheet includes an electrode sheet body and an electrode tab, and the electrode sheet body and the separator membrane are formed in the body portion. The outermost ring of the separator membrane is located outside the outermost ring of the electrode sheet, and a hydrogen absorption element is disposed on the outermost ring of the separator membrane. In the above structure, by placing the hydrogen absorption element on the outermost ring of the separator membrane, the risk of contact between the hydrogen absorption element and the electrode assembly is reduced, and the operational stability of the electrode assembly is improved. Simultaneously, sufficient area is provided for the hydrogen absorption element, improving the efficiency of the hydrogen absorption element in absorbing gas.

[0016] In some embodiments, the insulating element is disposed on the side of the housing facing the hydrogen absorption element. This structure improves the strength of the connection between the insulating element and the housing, increases the creepage distance between the hydrogen absorption element and the housing, and enhances the insulation protection performance of the hydrogen absorption assembly.

[0017] In some embodiments, the hydrogen absorption assembly further includes an adhesive component, which includes a support layer and an adhesive layer. The adhesive layer is connected to both the main body and the second intake bag, and the support layer is located on the side of the adhesive layer facing the outer shell. In the above structure, the second intake bag and the main body are connected by the adhesive layer, and the support layer improves the structural strength of the adhesive component and enhances the connection stability between the hydrogen absorption assembly and the electrode assembly.

[0018] In some embodiments, the orthogonal projection of the hydrogen absorption element onto the electrode assembly falls within the range of the main body portion along the thickness direction of the battery cell, and the thickness direction, the first direction, and the second direction of the battery cell are perpendicular to each other. In the above structure, placing the hydrogen absorption element within the range of the main body portion can reduce the risk of interference between the hydrogen absorption element and other components.

[0019] In some embodiments, along the first direction, the size of the main body is H1, and the size of the hydrogen-absorbing element is H2, where H1 and H2 satisfy: H2 ≤ H1. Along the second direction, the size of the main body is L1, and the size of the hydrogen-absorbing element is L2, where L1 and L2 satisfy: L2 ≤ L1. In the above structure, designing the shape of the hydrogen-absorbing element to be similar to that of the main body and designing the size of the hydrogen-absorbing element to be smaller than that of the main body allows for more effective utilization of the area of ​​the main body. Simultaneously, matching the shape of the hydrogen-absorbing element to the main body ensures balanced absorption of gas at various points on the electrode assembly, improving the gas absorption effect of the hydrogen-absorbing element.

[0020] In some embodiments, the orthographic projection of the hydrogen-absorbing element falls within the orthographic projection range of the insulating element along the thickness direction of the battery cell. This structure improves the insulation effect of the insulating element.

[0021] In some embodiments, the hydrogen-absorbing element has a dimension of H2, and the insulating element has a dimension of H3, where H2 ≤ H3. Along the second direction, the hydrogen-absorbing element has an extension length of L2, and the insulating element has an extension length of L3, where L2 ≤ L3. In the above structure, designing the shape of the insulating element to be similar to that of the hydrogen-absorbing element, and designing the dimension of the hydrogen-absorbing element to be smaller than that of the insulating element, increases the creepage distance between the hydrogen-absorbing element and the housing, improving the insulation effect of the insulating element. Simultaneously, matching the shape of the insulating element to the hydrogen-absorbing element increases the creepage distance at various points on the hydrogen-absorbing element, further improving the insulation effect of the insulating element.

[0022] In some embodiments, the hydrogen absorption element is connected to at least one side of the encapsulation film facing the receiving cavity. In the above structure, connecting the hydrogen absorption element to the inside of the encapsulation film can improve the stability of the connection between the hydrogen absorption element and the housing, as well as the accuracy of the installation position, and can improve the assembly efficiency of the battery cell.

[0023] In some embodiments, the insulating member is disposed on the side of the encapsulation film facing the receiving cavity, and the hydrogen absorption member is disposed on the side of the insulating member away from the encapsulation film. Furthermore, along the thickness direction of the battery cell, the orthographic projection of the hydrogen absorption member onto the encapsulation film falls within the orthographic projection range of the insulating member onto the encapsulation film. In the above structure, the insulating member is disposed on the side close to the encapsulation film, and the hydrogen absorption member is insulated from the outer casing. The hydrogen absorption member is disposed on the side close to the electrode assembly to facilitate gas absorption.

[0024] In some embodiments, the hydrogen absorption element comprises at least one of zirconium alloy, magnesium alloy, titanium alloy, or vanadium alloy, or LaxNiyMz, wherein M comprises at least one of Zr, Mn, Mg, Zn, Al, Ti, Fe, Cu, Co, Y, Ca, or Bi, and 0 < x ≤ 2, 0 ≤ y ≤ 7, 0 ≤ z ≤ 3. The above technical solution can effectively reduce the generation of hydrogen in the battery cell, thereby extending the cycle life of the battery cell.

[0025] In some embodiments, the battery cell satisfies at least one of the following conditions: 0.3 ≤ x ≤ 1; 1 ≤ y ≤ 5; 0 ≤ z ≤ 1; M includes at least one of Al, Mn, Mg, Fe, Y, or Bi. Titanium alloys include at least one of TiNi, Ti2Ni, TiFe, or TiMn2. Magnesium alloys include at least one of Mg2Ni, Mg2Cu, Mg2Co, Mg2Al, Mg2Cr, or Mg2Te. Zirconium alloys include at least one of ZrV2, ZrCr2, or ZrMn2. Vanadium alloys include V3TiNi. 0.56 M1 m M = 0.046-0.24, and M1 includes at least one of Al, Si, Fe, Cu, or Zr. The above technical solution can effectively reduce the generation of hydrogen in the battery cell, thereby extending the cycle life of the battery cell.

[0026] In some embodiments, the hydrogen absorption element includes La 0.5 Ni 4.5 Y 0.5 LaNi 3.5 Mn 0.2 YBi 0.3 LaNi 3.5 Mn 0.6 Y 0.4 Bi 0.5 LaNi 3.5 Mn 0.2 Y 0.4 Bi 0.9 LaTi 3.5 Fe 0.4 Zr 0.5 Bi 0.6 LaTi 3.5 Fe 0.4 Zr 0.5 Mg 0.6 LaNi 4.26 Al 0.08 Mg 0.16 Or La 0.43 Y 0.57 Ni 4.5 Al 0.08 Mn 0.3At least one of the above-mentioned technical solutions can effectively reduce the generation of hydrogen in battery cells, thereby extending the cycle life of battery cells.

[0027] In some embodiments, the active metal comprises at least one of lithium, sodium, potassium, zinc, or aluminum. In the above technical solution, by setting the active metal of the negative electrode active material layer of the negative electrode sheet in the main body to at least one of lithium, sodium, potassium, zinc, or aluminum, it is beneficial to improve the reactivity of the electrode assembly during use, thereby improving the performance of the battery cell.

[0028] In some embodiments, the solvent includes ether solvents, including at least one of 1,2-dimethoxypropane, dimethoxymethane, ethylene glycol dimethyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, pentaethylene glycol dimethyl ether, polyethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol diethyl ether, triethylene glycol diethyl ether, tetraethylene glycol diethyl ether, pentaethylene glycol diethyl ether, ethylene glycol dibutyl ether, diethylene glycol dibutyl ether, or 1,3-dioxane. In the above technical solution, this structure of the battery cell can reduce the gas generated inside the battery cell during cycling, further alleviating the phenomenon of a sharp increase in internal pressure of the battery cell caused by gas accumulation inside the casing. This further reduces the occurrence of bulging or deformation of the battery cell during use, further reducing the risk of connection failure or leakage of the casing during use, and thus improving the service life and reliability of the battery cell.

[0029] In some embodiments, the solvent includes ester solvents, including at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl 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, or diethyl sulfone. In the above technical solution, this structure of the battery cell can reduce the gas generated inside the battery cell during cycling, further alleviating the phenomenon of a sharp increase in internal pressure caused by gas accumulation inside the casing. This further reduces the occurrence of bulging or deformation of the battery cell during use, further reducing the risk of connection failure or leakage of the casing during use, and thus improving the service life and reliability of the battery cell.

[0030] Secondly, this application provides a battery device that includes the battery cell described in the above embodiments.

[0031] Thirdly, this application provides an electrical device that includes the battery device described in the above embodiments, the battery device being used to provide electrical energy.

[0032] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0033] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0034] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0035] Figure 2 Explosion-proof diagrams of battery devices provided in some embodiments of this application;

[0036] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0037] Figure 4 for Figure 3 Schematic diagram of section AA;

[0038] Figure 5 for Figure 4 A magnified structural diagram of part B in the middle section;

[0039] Figure 6 This is a partial exploded view of the battery cell structure provided in some embodiments of this application;

[0040] Figure 7 for Figure 6 Schematic diagram of the CC section;

[0041] Figure 8 for Figure 7 A magnified structural diagram of section D;

[0042] Figure 9 This is a schematic diagram of the exploded structure of a hydrogen absorption element provided in some embodiments of this application;

[0043] Figure 10 This is a schematic diagram of the structure of a hydrogen absorption element provided in some embodiments of this application;

[0044] Figure 11 This is a schematic diagram of the structure of the insulating element provided in some embodiments of this application;

[0045] Figure 12 This is a schematic diagram of the structure of a hydrogen absorption element provided in some other embodiments of this application;

[0046] Figure 13 This is a schematic diagram of the structure of a hydrogen absorption element provided in some embodiments of this application;

[0047] Figure 14 The diagram shows the structure of a single battery cell provided in some embodiments of this application.

[0048] Detailed Explanation of Reference Numerals

[0049] 1. Vehicle; 2. Battery unit; 3. Controller; 4. Motor; 5. Housing; 5a. First housing section; 5b. Second housing section; 5c. Retaining space; 6. Battery cell; 10. Electrode assembly; 101. Main body section; 102. Electrode tab; 103. Welding section; 20. Outer shell; 30. Hydrogen absorption assembly; 301. Hydrogen absorption component; 302. Insulating component; 303. First vent; 304. Second vent; 305. Adhesive component; 306. Fourth vent; 307. Suction bag; 307A. First suction bag; 307B. Second suction bag; 308. First section; 309. Second section; 310. Third section; 311. Insulating sheet; 312. Adhesive layer; 50. Electrode terminal; X, First direction; Y, Second direction; Z, Thickness direction. Detailed Implementation

[0050] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0052] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0053] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0054] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0055] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0056] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0057] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0058] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0059] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0060] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 85°-95°, the two directions can be considered perpendicular; if the angle between two directions is 0°-5°, the two directions can be considered parallel.

[0061] In this application, "multiple" means two or more (including two).

[0062] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0063] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0064] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0065] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0066] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0067] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0068] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.8 Co 0.15 Al 0.05At least one of O2 and its modified compounds. Modified compounds refer to substances obtained by modification methods such as doping or coating based on the above-mentioned substances.

[0069] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0070] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0071] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0072] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0073] In some embodiments, the negative electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not have a negative electrode active material.

[0074] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0075] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0076] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0077] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0078] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a single component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes. An inorganic particle coating, an organic particle coating, or an organic / inorganic composite coating can also be applied to the surface of the separator.

[0079] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0080] Liquid electrolytes include electrolyte salts and solvents.

[0081] In some embodiments, the electrolyte may optionally include additives. For example, additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell, such as additives that improve the overcharge / fast charge performance of the battery cell, additives that improve the high-temperature performance of the battery cell, and additives that improve the low-temperature performance of the battery cell.

[0082] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid-lithium salt.

[0083] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0084] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

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

[0086] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0087] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0088] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0089] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0090] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0091] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0092] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0093] In some embodiments, the battery cell may include a casing. The casing may be an aluminum-plastic film or the like. In some embodiments, the sealed bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as electrode assemblies and electrolytes.

[0094] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal can be directly connected to the tab, or it can be indirectly connected to the tab through a current collector. The electrode terminal can be provided on the end cap or on the housing.

[0095] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0096] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0097] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0098] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0099] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0100] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0101] During battery cell operation, hydrogen gas is generated due to electrolyte decomposition and cathode material oxidation. Increased hydrogen volume can lead to casing deformation and cracking. Therefore, it is necessary to reduce hydrogen accumulation inside the battery cell.

[0102] Therefore, this application provides a battery cell that uses a casing to protect the electrode assembly, reducing the impact of external impurities and moisture on the electrode assembly. The hydrogen-absorbing component in the hydrogen-absorbing assembly effectively mitigates the phenomenon of gas accumulation inside the battery cell when the electrode assembly containing active metals is used in ether or ester electrolytes, causing a surge in internal pressure. This effectively reduces the likelihood of bulging or deformation of the battery cell during use, lowering the risk of connection failure or leakage during casing operation, and thus improving the battery cell's lifespan and reliability. Furthermore, the insulating component in the hydrogen-absorbing assembly insulates the hydrogen-absorbing component from the casing, reducing the risk of short circuits or leakage caused by energizing the hydrogen-absorbing component and casing, and improving the stability of the battery cell's operation.

[0103] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use individual battery cells, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0104] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0105] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0106] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0107] like Figure 1As shown, a battery 2 is installed inside the vehicle 1. The battery 2 can be located at the bottom, front, or rear of the vehicle 1. The battery device 2 can be used to power the vehicle 1; for example, the battery device 2 can serve as the operating power source for the vehicle 1.

[0108] The vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0109] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0110] Figure 2 This is a schematic diagram of a battery explosion provided for some embodiments of this application. For example... Figure 2 As shown, the battery device 2 includes a housing 5 and battery cells 6, with the battery cells 6 housed within the housing 5. The battery cell 6 can be the smallest unit that makes up a battery.

[0111] The housing 5 is used to house the battery cell 6, and the housing 5 can have various structures. In some embodiments, the housing 5 may include a first housing portion 5a and a second housing portion 5b, which overlap each other, and together define a housing space 5c for housing the battery cell 6. The second housing portion 5b may be a hollow structure with one end open, and the first housing portion 5a may be a plate-like structure, with the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the housing space 5c; alternatively, both the first housing portion 5a and the second housing portion 5b may be hollow structures with one side open, with the open side of the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the housing space 5c. Of course, the first housing portion 5a and the second housing portion 5b can be various shapes, such as cylinders, cuboids, etc.

[0112] To improve the sealing performance after the first housing part 5a and the second housing part 5b are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 5a and the second housing part 5b.

[0113] Assuming that the first box section 5a covers the top of the second box section 5b, the first box section 5a can also be called the upper box cover, and the second box section 5b can also be called the lower box.

[0114] In the battery device 2, there can be one or more battery cells 6. If there are multiple battery cells 6, they can be connected in series, in parallel, or in a mixed manner. A mixed connection means that multiple battery cells 6 are connected in both series and parallel.

[0115] Multiple battery cells 6 can be directly connected in series, parallel, or in a mixed manner, and then the whole composed of multiple battery cells 6 can be housed in the housing 5; of course, multiple battery cells 6 can also be connected in series, parallel, or in a mixed manner to form a battery module, and multiple battery modules can then be connected in series, parallel, or in a mixed manner to form a whole, and housed in the housing 5.

[0116] Please refer to the reference. Figures 3 to 5 , Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application. Figure 4 for Figure 3 Schematic diagram of section AA in the middle. Figure 5 for Figure 4 A magnified structural diagram of part B.

[0117] As shown in the figure, the battery cell 6 includes a casing 20, an electrode assembly 10, an electrolyte, and a hydrogen absorption assembly 30. The casing 20 has a receiving cavity and includes two encapsulation films disposed opposite each other, connected to each other and enclosing the receiving cavity. The electrode assembly 10 is disposed in the receiving cavity and includes a negative electrode sheet. The negative electrode sheet includes a negative current collector and a negative active material layer disposed on at least one side of the negative current collector, the negative active material layer including an elemental active metal. The electrolyte is contained in the receiving cavity and includes an electrolyte salt and a solvent, the solvent including at least one of ether solvents or ester solvents. The hydrogen absorption assembly 30 is disposed in the receiving cavity and includes a hydrogen absorption element 301 and an insulating element 302. The hydrogen absorption element 301 is disposed between the electrode assembly 10 and the casing 20, and is used to absorb at least a portion of the hydrogen gas in the receiving cavity.

[0118] The electrode assembly 10 includes a positive electrode sheet, a negative electrode sheet, and a separator. The positive electrode sheet includes a positive current collector and a positive active material layer disposed on at least one side of the positive current collector, the positive active material layer comprising a positive active material. The negative electrode sheet includes a negative current collector and a negative active material layer disposed on at least one side of the negative current collector, the negative active material layer comprising a negative active material. In this embodiment, the negative active material layer of the negative electrode sheet comprises an elemental active metal. It can be understood that an active metal refers to a metal capable of providing active metal ions. For example, the elemental active metal of the lithium-alkali metal battery cell 6 is elemental lithium, and the elemental active metal of the sodium-alkali metal battery cell 6 is elemental sodium. Correspondingly, in the above-mentioned types of battery cells 6, the active metal on the negative electrode sheet is relatively reactive and will undergo side reactions with water, solvents in the electrolyte, and residual alkali in the positive active material, resulting in a large amount of gas production, with hydrogen accounting for >90% of the gas.

[0119] The housing 20 includes two stacked aluminum-plastic films, which are circumferentially welded together and encapsulated to form a sealed structure with an internal receiving cavity. Exemplarily, the shape and size of the receiving cavity are matched to the electrode assembly 10.

[0120] The hydrogen absorption element 301 is used to absorb hydrogen gas inside the battery cell 6. Exemplarily, the hydrogen absorption element 301 may be made of materials such as nickel-titanium alloy, magnesium-based materials, or graphene. The specific structural form of the hydrogen absorption element 301 can be configured with reference to the description in the following embodiments.

[0121] The hydrogen absorption element 301 is disposed on the electrode assembly 10, meaning that the hydrogen absorption element 301 forms a stable connection with the electrode assembly 10. For example, the hydrogen absorption element 301 can be connected to the insulating film covering the electrode assembly 10, or the hydrogen absorption element 301 can be connected to the isolation film of the electrode assembly 10.

[0122] The insulating component 302 can be made of materials with good insulation properties, certain corrosion resistance, and certain high temperature resistance, such as silicone, epoxy resin, or polyethylene. The insulating component 302 is disposed between the electrode assembly 10 and the housing 20 to increase the creepage distance between the hydrogen absorption component 301 and the housing 20.

[0123] In the technical solution of this application embodiment, the electrode assembly 10 is protected by a housing 20, reducing the impact of external impurities and moisture on the electrode assembly 10. The hydrogen-absorbing element 301 in the hydrogen-absorbing assembly 30 can effectively alleviate the phenomenon of gas accumulation inside the battery cell 6 caused by the accumulation of gas generated when the electrode assembly 10 with active metals is used in ether or ester electrolytes, thereby effectively reducing the occurrence of bulging or deformation of the battery cell 6 during use, reducing the risk of connection failure or leakage of the housing 20 during use, and improving the service life and reliability of the battery cell 6. Furthermore, the insulating element 302 in the hydrogen-absorbing assembly 30 insulates the hydrogen-absorbing element 301 from the housing 20, reducing the risk of short circuit or leakage caused by the hydrogen-absorbing element 301 being energized with the housing 20, and improving the operational stability of the battery cell 6.

[0124] In some embodiments of this application, the hydrogen absorption element 301 comprises at least one of zirconium alloy, magnesium alloy, titanium alloy, vanadium alloy, or LaxNiyMz, wherein M comprises at least one of Zr, Mn, Mg, Zn, Al, Ti, Fe, Cu, Co, Y, Ca, or Bi, and 0 < x ≤ 2, 0 ≤ y ≤ 7, 0 ≤ z ≤ 3. The above technical solution can effectively reduce the generation of hydrogen in the battery cell 6, thereby extending the cycle life of the battery cell 6.

[0125] In some embodiments of this application, the battery cell 6 satisfies at least one of the following conditions: 0.3 ≤ x ≤ 1; 1 ≤ y ≤ 5; 0 ≤ z ≤ 1; M includes at least one of Al, Mn, Mg, Fe, Y, or Bi. Titanium alloys include at least one of TiNi, Ti2Ni, TiFe, or TiMn2. Magnesium alloys include at least one of Mg2Ni, Mg2Cu, Mg2Co, Mg2Al, Mg2Cr, or Mg2Te. Zirconium alloys include at least one of ZrV2, ZrCr2, or ZrMn2. Vanadium alloys include V3TiNi. 0.56 M1m, where m = 0.046-0.24, and M1 includes at least one of Al, Si, Fe, Cu, or Zr. The above technical solution can effectively reduce the generation of hydrogen in battery cell 6, thereby extending the cycle life of battery cell 6.

[0126] In some embodiments of this application, the encapsulation film includes a metal layer, a connecting layer, and an insulating layer. The connecting layer is disposed on one side surface of the metal layer, and the insulating layer is disposed on the other side surface of the metal layer away from the connecting layer. The connecting layers of the two encapsulation films are disposed opposite to each other and connected to form an encapsulation area. The encapsulation area is disposed around the electrode assembly 10. The encapsulation area includes a first encapsulation portion and a second encapsulation portion extending along a first direction X, and a third encapsulation portion and a fourth encapsulation portion extending along a second direction Y. The first direction X is perpendicular to the second direction Y. The first encapsulation portion, the third encapsulation portion, the second encapsulation portion, and the fourth encapsulation portion are connected end to end in sequence and disposed along the circumference of the electrode assembly 10. The hydrogen absorption assembly 30 is disposed within the encapsulation area.

[0127] In the above structure, the metal layer provides structural support for the encapsulation film, improving its structural strength and toughness. The connecting layer connects the two encapsulation films, improving the connection strength and sealing performance of the encapsulation. The insulating layer insulates the outer casing 20, reducing the risk of short circuits between adjacent battery cells 6. The fourth encapsulation section forms a structurally regular encapsulation area, improving encapsulation efficiency and sealing performance. The hydrogen absorption assembly 30, located within the encapsulation area, absorbs hydrogen gas within the containment cavity, reducing the risk of deformation of the outer casing 20 caused by hydrogen accumulation within the encapsulation area.

[0128] like Figures 6 to 8 As shown, in some embodiments of this application, the electrode assembly 10 includes a main body 101 and a tab 102 extending from the main body 101, with at least a portion of the hydrogen absorption assembly 30 connected to the surface of the tab 102. In the above structure, by placing the hydrogen absorption component 301 on the tab 102, the space between the tab 102 and the outer casing 20 can be fully utilized, and the accumulation of gas near the tab 102 can be reduced, thereby reducing the risk of deformation of the outer casing 20 at the tab 102 and improving the operational stability of the battery cell 6.

[0129] In some embodiments of this application, the tab 102 extends from one side of the main body 101 along a second direction Y. Exemplarily, the second direction Y is the height direction of the electrode assembly 10, and the first direction X is the width direction of the electrode assembly 10. The battery cell 6 also includes an electrode terminal 50, which is welded to the tab 102 to form a welded portion 103. The electrode terminal 50 extends from one end away from the main body 101 along the second direction Y to the outside of the housing 20. A hydrogen absorption component 30 is disposed on at least one surface of the tab 102 and is located between the welded portion 103 and the main body 101. In the above structure, disposing of the hydrogen absorption component 301 in the space between the welded portion 103 and the main body 101 reduces the risk of interference between the hydrogen absorption component 301 and the electrode terminal 50, and improves the connection stability between the electrode terminal 50 and the tab 102. In some embodiments of this application, the hydrogen absorption component 301 is disposed on the surface of the tab 102. Exemplarily, the hydrogen absorption component 301 is coated on the surface of the tab 102. The above structure attaches the gas-absorbing material to the surface of the tab 102 through a coating, which improves the connection strength and stability between the hydrogen absorption component 301 and the tab 102, and improves the stability of the gas absorption process.

[0130] In some embodiments of this application, the insulating element 302 is disposed on the surface of the encapsulation film facing the hydrogen-absorbing element 301. Exemplarily, the insulating element 302 is coated on the surface of the hydrogen-absorbing element 301. In the above structure, attaching the insulating material to the surface of the hydrogen-absorbing element 301 by means of a coating can improve the connection strength between the insulating element 302 and the hydrogen-absorbing element 301, while also improving the insulation protection performance.

[0131] like Figure 9 As shown, in some embodiments of this application, the hydrogen absorption component 301 includes a first suction bag 307A and suction particles. The first suction bag 307A has a plurality of first vent holes 303. The suction particles are disposed inside the first suction bag 307A, and the minimum particle size of the suction particles is larger than the maximum pore size of the first vent holes 303. In the above structure, by providing the first suction bag 307A to enclose the suction particles, the manufacturing and assembly of the hydrogen absorption component 301 is facilitated. By providing a plurality of first suction holes, the suction particles can easily absorb gas from the containing cavity.

[0132] In some embodiments of this application, the first air intake bag 307A is made of insulating material to form an insulating element 302. The above structure, using insulating material to manufacture the first air intake bag 307A, can accommodate the air intake material while achieving insulation between the hydrogen absorption element 301 and the outer casing 20 and the electrode assembly 10. This simplifies the structure of the hydrogen absorption assembly 30, reduces the space occupied by the hydrogen absorption assembly 30, and improves the energy density of the battery cell 6.

[0133] In some embodiments of this application, the insulating member 302 includes an insulating sheet 311 and an adhesive layer 312. The adhesive layer 312 includes a first segment 308 attached to the main body 101, a second segment 309 attached to the hydrogen-absorbing member 301, and a third segment 310 attached to the electrode tab 102. The insulating member 302 is connected to the first segment 308, the second segment 309, and the third segment 310, respectively. In the above structure, by providing the adhesive layer 312, the adhesive layer 312 is bonded to the main body 101, the hydrogen-absorbing member 301, and the electrode tab 102, respectively, thereby improving the connection strength between the insulating member 302 and the electrode assembly 10. At the same time, the insulating sheet 311 is also connected to the first segment 308, the second segment 309, and the third segment 310 of the adhesive layer 312, respectively, further increasing the creepage distance between the hydrogen-absorbing member 301 and the outer casing 20, and improving the insulation effect of the insulating member 302.

[0134] like Figure 10 As shown, in some embodiments of this application, the hydrogen-absorbing element 301 falls within the orthogonal projection range of the insulating sheet 311 on the tab 102 along the thickness direction Z of the battery cell 6. This structure increases the creepage distance between the hydrogen-absorbing element 301 and the outer casing 20, improving insulation stability.

[0135] like Figure 11 As shown, in some embodiments of this application, the electrode assembly 10 includes a main body 101 and tabs 102 extending from the main body 101, and the hydrogen absorption assembly 30 is disposed on the main body 101. With the above structure, disposing the hydrogen absorption member 301 on the main body 101 increases the contact area between the hydrogen absorption member 301 and the electrode assembly 10, improves the stability of the connection between the hydrogen absorption member 301 and the electrode assembly 10, and reduces the risk of displacement of the hydrogen absorption member 301.

[0136] In some embodiments of this application, the electrode assembly 10 includes an electrode sheet and a separator membrane, which are arranged along the winding direction. The electrode sheet includes an electrode sheet body and an electrode tab 102, and the electrode sheet body and the separator membrane are formed in the body portion 101. The outermost ring of the separator membrane is located outside the outermost ring of the electrode sheet, and the hydrogen absorption element 301 is disposed on the outermost ring of the separator membrane. In the above structure, by placing the hydrogen absorption element 301 on the outermost ring of the separator membrane, the risk of the hydrogen absorption element 301 contacting the electrode assembly 10 is reduced, and the operational stability of the electrode assembly 10 is improved. At the same time, sufficient area is provided to accommodate the hydrogen absorption element 301, thereby improving the efficiency of the hydrogen absorption element 301 in absorbing gas.

[0137] like Figure 12As shown, in some embodiments of this application, the hydrogen absorption assembly 30 includes a second suction bag 307B and suction particles. The second suction bag 307B has a plurality of second vent holes 304, and the suction particles are disposed within the second suction bag 307B. In the above structure, by providing the second suction bag 307B to enclose the suction particles, the manufacturing and assembly of the hydrogen absorption component 301 is facilitated. By providing a plurality of second suction holes, the suction particles can easily absorb gas from the containing cavity.

[0138] In some embodiments of this application, the second air intake bag 307B is made of insulating material to form the insulating member 302. The above structure, using insulating material to manufacture the second air intake bag 307B, can accommodate the air intake material while achieving insulation between the hydrogen absorption member 301 and the outer casing 20 and the electrode assembly 10, simplifying the structure of the hydrogen absorption assembly 30, reducing the space occupied by the hydrogen absorption assembly 30, and improving the energy density of the battery cell 6.

[0139] In some embodiments of this application, the insulating member 302 is disposed on the side of the housing 20 facing the hydrogen absorption member 301. The above structure improves the connection strength between the insulating member 302 and the housing 20, increases the creepage distance between the hydrogen absorption member 301 and the housing 20, and improves the insulation protection performance of the hydrogen absorption assembly 30.

[0140] In some embodiments of this application, the minimum particle size of the inhaled particles is greater than the maximum aperture of the second vent 304. In the above structure, by limiting the aperture of the second vent 304, the inhaled particles can be confined within the inhalation bag 307, reducing leakage of inhaled particles into the electrode assembly 10 through the second vent 304 and improving the positional stability of the inhaled particles.

[0141] like Figure 13 As shown, in some embodiments of this application, the hydrogen absorption assembly 30 further includes an adhesive member 305. The adhesive member 305 includes a support layer and an adhesive layer 312. The adhesive layer 312 is connected to the main body 101 and the second suction bag 307B, respectively. The support layer is disposed on the side of the adhesive layer 312 facing the outer shell 20. In the above structure, the second suction bag 307B and the main body 101 are connected by the adhesive layer 312, and the support layer improves the structural strength of the adhesive member 305 and enhances the connection stability between the hydrogen absorption assembly 30 and the electrode assembly 10.

[0142] like Figure 14 As shown, in some embodiments of this application, along the thickness direction Z of the battery cell 6, the orthogonal projection of the hydrogen absorption element 301 on the electrode assembly 10 falls within the range of the main body 101, and the thickness direction Z, the first direction X, and the second direction Y of the battery cell 6 are perpendicular to each other. In the above structure, placing the hydrogen absorption element 301 within the range of the main body 101 can reduce the risk of interference between the hydrogen absorption element 301 and other components.

[0143] In some embodiments of this application, along the first direction X, the size of the main body 101 is H1, and the size of the hydrogen absorption element 301 is H2, where H1 and H2 satisfy: H2≤H1. Along the second direction Y, the size of the main body 101 is L1, and the size of the hydrogen absorption element 301 is L2, where L1 and L2 satisfy: L2≤L1. In the above structure, the shape of the hydrogen absorption element 301 is designed to be similar to that of the main body 101, and the size of the hydrogen absorption element 301 is designed to be smaller than that of the main body 101. This allows for more effective utilization of the area of ​​the main body 101. Furthermore, matching the shape of the hydrogen absorption element 301 to the main body 101 ensures balanced absorption of gas at various locations on the electrode assembly 10, thereby improving the gas absorption effect of the hydrogen absorption element 301.

[0144] In some embodiments of this application, the orthographic projection of the hydrogen absorption element 301 along the thickness direction Z of the battery cell 6 falls within the orthographic projection range of the insulating element 302. This structure improves the insulation effect of the insulating element 302.

[0145] In some embodiments of this application, the hydrogen-absorbing element 301 has a dimension of H2, and the insulating element 302 has a dimension of H3, where H3 and H2 satisfy: H2≤H3. Along the second direction Y, the extension length of the hydrogen-absorbing element 301 is L2, and the extension length of the insulating element 302 is L3, where L3 and L2 satisfy: L2≤L3. In the above structure, designing the shape of the insulating element 302 to be similar to that of the hydrogen-absorbing element 301, and designing the dimension of the hydrogen-absorbing element 301 to be smaller than that of the insulating element 302, can increase the creepage distance between the hydrogen-absorbing element 301 and the outer casing 20, thereby improving the insulation effect of the insulating element 302. Simultaneously, matching the shape of the insulating element 302 to that of the hydrogen-absorbing element 301 increases the creepage distance at various points on the hydrogen-absorbing element 301, further improving the insulation effect of the insulating element 302.

[0146] In some embodiments of this application, the hydrogen absorption element 301 is connected to at least one side of the encapsulation film facing the receiving cavity. In the above structure, connecting the hydrogen absorption element 301 to the inside of the encapsulation film can improve the stability of the connection between the hydrogen absorption element 301 and the housing 20 and the accuracy of the installation position, and can also improve the assembly efficiency of the battery cell 6.

[0147] In some embodiments of this application, the insulating member 302 is disposed on the side of the encapsulation film facing the receiving cavity, and the hydrogen absorption member 301 is disposed on the side of the insulating member 302 away from the encapsulation film. Along the thickness direction Z of the battery cell 6, the orthographic projection of the hydrogen absorption member 301 on the encapsulation film falls within the orthographic projection range of the insulating member 302 on the encapsulation film. In the above structure, the insulating member 302 is disposed on the side close to the encapsulation film, and the hydrogen absorption member 301 is insulated from the outer casing 20. The hydrogen absorption member 301 is disposed on the side close to the electrode assembly 10 to facilitate gas absorption.

[0148] In some embodiments of this application, the active metal element includes at least one of lithium, sodium, potassium, zinc, or aluminum. In the above-described technical solution, by setting the active metal element of the negative electrode active material layer of the negative electrode sheet of the main body 101 to at least one of lithium, sodium, potassium, zinc, or aluminum, it is beneficial to improve the reactivity of the electrode assembly 10 during use, thereby improving the performance of the battery cell 6.

[0149] In some embodiments of this application, the solvent includes ether solvents, which include at least one of 1,2-dimethoxypropane, dimethoxymethane, ethylene glycol dimethyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, pentaethylene glycol dimethyl ether, polyethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol diethyl ether, triethylene glycol diethyl ether, tetraethylene glycol diethyl ether, pentaethylene glycol diethyl ether, ethylene glycol dibutyl ether, diethylene glycol dibutyl ether, or 1,3-dioxane. In the above technical solution, the battery cell 6 with this structure can reduce the gas generated inside the battery cell 6 during the cycle, so as to further alleviate the phenomenon of the battery cell 6’s internal pressure increasing sharply after the gas accumulates inside the casing 20. This can further reduce the phenomenon of bulging or deformation of the battery cell 6 during use, and further reduce the risk of connection failure or leakage of the casing 20 during use, which is conducive to further improving the service life and reliability of the battery cell 6.

[0150] In some embodiments of this application, the solvent includes ester solvents, including at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl 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, or diethyl sulfone. In the above technical solution, this structure of the battery cell 6 can reduce the gas generated inside the battery cell 6 during cycling, further alleviating the phenomenon of a sharp increase in internal pressure of the battery cell 6 caused by gas accumulation inside the casing 20. This further reduces the occurrence of bulging or deformation of the battery cell 6 during use, further reducing the risk of connection failure or leakage of the casing 20 during use, and is beneficial to further improving the service life and reliability of the battery cell 6.

[0151] In some optional embodiments, the battery cell 6 includes a housing 20, an electrode assembly 10, an electrolyte, and a hydrogen absorption assembly 30. The housing 20 has a receiving cavity and includes two encapsulation films disposed opposite each other, the two encapsulation films being interconnected and enclosing the receiving cavity. The electrode assembly 10 is disposed in the receiving cavity and includes a negative electrode sheet. The negative electrode sheet includes a negative current collector and a negative active material layer disposed on at least one side of the negative current collector, the negative active material layer including an elemental active metal. The electrolyte is contained in the receiving cavity and includes an electrolyte salt and a solvent, the solvent including at least one of ether solvents or ester solvents. The hydrogen absorption assembly 30 is disposed in the receiving cavity and includes a hydrogen absorption element 301 and an insulating element 302. The hydrogen absorption element 301 is disposed between the electrode assembly 10 and the housing 20, and the hydrogen absorption element 301 is used to absorb at least a portion of the hydrogen gas in the receiving cavity. The encapsulation film includes a metal layer, a connecting layer, and an insulating layer. The connecting layer is disposed on one side of the metal layer, and the insulating layer is disposed on the other side of the metal layer opposite to the connecting layer. The connecting layers of the two encapsulation films are arranged opposite each other and connected to form an encapsulation area. The encapsulation area surrounds the electrode assembly 10. The encapsulation area includes a first encapsulation portion and a second encapsulation portion extending along a first direction X, and a third encapsulation portion and a fourth encapsulation portion extending along a second direction Y. The first direction X is perpendicular to the second direction Y. The first encapsulation portion, the third encapsulation portion, the second encapsulation portion, and the fourth encapsulation portion are connected end to end in sequence and arranged circumferentially along the electrode assembly 10. The hydrogen absorption component 30 is disposed within the encapsulation area. The electrode assembly 10 includes a main body portion 101 and a tab 102 extending from the main body portion 101. At least a portion of the hydrogen absorption component 30 is connected to the surface of the tab 102. The tab 102 extends from the main body portion 101 along one side of the second direction Y. The battery cell 6 also includes an electrode terminal 50. Electrode terminals 50 are welded to tabs 102 to form welded portions 103. One end of the electrode terminal 50 extends away from the main body 101 along the second direction Y and to the outside of the housing 20. A hydrogen absorption assembly 30 is disposed on at least one surface of the tab 102 and is located between the welded portion 103 and the main body 101. The hydrogen absorption assembly 301 includes a first gas absorption bag 307A and gas absorption particles. The first gas absorption bag 307A has a plurality of first vent holes 303. Gas absorption particles are disposed within the first gas absorption bag 307A, and the minimum particle size of the gas absorption particles is larger than the maximum pore size of the first vent holes 303. The insulating component 302 includes an insulating sheet 311 and an adhesive layer 312. The adhesive layer 312 includes a first segment 308 attached to the main body 101, a second segment 309 attached to the hydrogen absorption component 301, and a third segment 310 attached to the tab 102. The insulating component 302 is connected to the first segment 308, the second segment 309, and the third segment 310 respectively.

[0152] In some optional embodiments, the battery cell 6 includes a housing 20, an electrode assembly 10, an electrolyte, and a hydrogen absorption assembly 30. The housing 20 has a receiving cavity and includes two encapsulation films disposed opposite each other, the two encapsulation films being interconnected and enclosing the receiving cavity. The electrode assembly 10 is disposed in the receiving cavity and includes a negative electrode sheet. The negative electrode sheet includes a negative current collector and a negative active material layer disposed on at least one side of the negative current collector, the negative active material layer including an elemental active metal. The electrolyte is contained in the receiving cavity and includes an electrolyte salt and a solvent, the solvent including at least one of ether solvents or ester solvents. The hydrogen absorption assembly 30 is disposed in the receiving cavity and includes a hydrogen absorption element 301 and an insulating element 302. The hydrogen absorption element 301 is disposed between the electrode assembly 10 and the housing 20, and the hydrogen absorption element 301 is used to absorb at least a portion of the hydrogen gas in the receiving cavity. The encapsulation film includes a metal layer, a connecting layer, and an insulating layer. The connecting layer is disposed on one surface of the metal layer, and the insulating layer is disposed on the other surface of the metal layer opposite to the connecting layer. The connecting layers of two encapsulation films are arranged opposite each other and connected to form an encapsulation area. The encapsulation area surrounds the electrode assembly 10. The encapsulation area includes a first encapsulation portion and a second encapsulation portion extending along a first direction X, and a third encapsulation portion and a fourth encapsulation portion extending along a second direction Y. The first direction X is perpendicular to the second direction Y. The first encapsulation portion, the third encapsulation portion, the second encapsulation portion, and the fourth encapsulation portion are connected end to end and arranged circumferentially along the electrode assembly 10. The hydrogen absorption component 30 is disposed within the encapsulation area. The electrode assembly 10 includes a main body portion 101 and a tab 102 extending from the main body portion 101. The hydrogen absorption component 30 is disposed on the main body portion 101. The electrode assembly 10 includes an electrode sheet and a separator, which are arranged along the winding direction. The electrode sheet includes an electrode body and an electrode tab 102. The electrode body and the separator are formed in the main body 101. The outermost ring of the separator is located outside the outermost ring of the electrode sheet, and the hydrogen absorption element 301 is disposed on the outermost ring of the separator. The hydrogen absorption assembly 30 includes a second gas-absorbing bag 307B and gas-absorbing particles. The second gas-absorbing bag 307B has a plurality of second vent holes 304, and the gas-absorbing particles are disposed inside the second gas-absorbing bag 307B. An insulating element 302 is disposed on the side of the outer shell 20 facing the hydrogen absorption element 301. The minimum particle size of the gas-absorbing particles is larger than the maximum pore size of the second vent holes 304. The hydrogen absorption assembly 30 also includes an adhesive element 305, which includes a support layer and an adhesive layer 312. The adhesive layer 312 is connected to the main body 101 and the second gas-absorbing bag 307B, respectively, and the support layer is disposed on the side of the adhesive layer 312 facing the outer shell 20.

[0153] This application provides a battery device 2, which includes the battery cell 6 described in the above embodiments. This application also provides an electrical device, which includes the battery device 2 described in the above embodiments, and the battery device 2 is used to provide electrical energy. Both the battery device 2 and the electrical device in this application include the battery cell 6 described in the above embodiments. The battery cell 6 is protected by a housing 20 to reduce the impact of external impurities and moisture on the electrode assembly 10. The hydrogen absorption component 301 in the hydrogen absorption assembly 30 can effectively alleviate the phenomenon of a sharp increase in internal pressure of the battery cell 6 caused by the accumulation of gas generated inside the housing 20 when the electrode assembly 10 with active metals is used in ether or ester electrolytes. This effectively reduces the risk of bulging or deformation of the battery cell 6 during use, thereby reducing the risk of connection failure or leakage in the housing 20 during use, and improving the service life and reliability of the battery cell 6. Furthermore, the insulating component 302 in the hydrogen absorption assembly 30 insulates the hydrogen absorption component 301 from the outer casing 20, reducing the risk of short circuit or leakage caused by the hydrogen absorption component 301 and the outer casing 20 being energized, and improving the operational stability of the battery cell 6.

[0154] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The housing has a receiving cavity, and the housing includes two encapsulation films disposed opposite to each other, the two encapsulation films being connected to each other and enclosing the receiving cavity; An electrode assembly is disposed in the receiving cavity. The electrode assembly includes a negative electrode sheet, the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer disposed on at least one side of the negative electrode current collector, the negative electrode active material layer including an elemental active metal. An electrolyte is contained in the cavity, the electrolyte comprising an electrolyte salt and a solvent, the solvent comprising at least one of an ether solvent or an ester solvent; A hydrogen absorption assembly is disposed in the receiving cavity and includes a hydrogen absorption element and an insulating element. The hydrogen absorption element is disposed between the electrode assembly and the housing, and the hydrogen absorption element is used to absorb at least a portion of the hydrogen gas in the receiving cavity.

2. The battery cell according to claim 1, characterized in that, The encapsulation film includes a metal layer, a connecting layer, and an insulating layer. The connecting layer is disposed on one side surface of the metal layer, and the insulating layer is disposed on the other side surface of the metal layer opposite to the connecting layer. The connecting layers of two encapsulation films are arranged opposite to each other and connected to form an encapsulation area. The encapsulation area surrounds the electrode assembly. The encapsulation area includes a first encapsulation portion and a second encapsulation portion extending along a first direction, a third encapsulation portion and a fourth encapsulation portion extending along a second direction. The first direction is perpendicular to the second direction. The first encapsulation portion, the third encapsulation portion, the second encapsulation portion and the fourth encapsulation portion are connected end to end in sequence and arranged circumferentially along the electrode assembly. At least a portion of the hydrogen absorption assembly is disposed within the encapsulation area.

3. The battery cell according to claim 2, characterized in that, The electrode assembly includes a main body and tabs extending from the main body, at least a portion of the hydrogen absorption assembly is connected to the surface of the tabs, and / or at least a portion of the hydrogen absorption element is connected to the main body.

4. The battery cell according to claim 3, characterized in that, The tab extends from one side of the main body along the second direction. The battery cell also includes an electrode terminal, which is welded to the tab to form a welded portion. The electrode terminal extends from one end of the main body along the second direction to the outside of the housing. The hydrogen absorption assembly is disposed on at least one surface of the electrode tab and is located between the welded portion and the main body portion.

5. The battery cell according to claim 4, characterized in that, The hydrogen absorption element is disposed on the surface of the electrode tab.

6. The battery cell according to claim 5, characterized in that, The insulating element is disposed on the surface of the encapsulation film facing the hydrogen-absorbing element.

7. The battery cell according to claim 3, characterized in that, The hydrogen absorption element includes: The air intake bag has multiple ventilation holes; The air-absorbing particles are disposed inside the air-absorbing bag, and the minimum particle size of the air-absorbing particles is larger than the maximum aperture of the air vent.

8. The battery cell according to claim 7, characterized in that, The air-absorbing bag is made of insulating material to form the insulating component.

9. The battery cell according to claim 5, characterized in that, The insulating component includes an insulating sheet and an adhesive layer. The adhesive layer includes a first section attached to the main body, a second section attached to the hydrogen absorption member, and a third section attached to the electrode tab, and the insulating member is connected to the first, second, and third sections respectively.

10. The battery cell according to claim 7, characterized in that, The electrode assembly includes an electrode sheet and a separator membrane, which are arranged along the winding direction. The electrode sheet includes an electrode sheet body and an electrode tab, and the electrode sheet body and the separator membrane are formed in the body portion. The outermost ring of the separator membrane is located outside the outermost ring of the electrode sheet, and the hydrogen absorption element is disposed on the outermost ring of the separator membrane.

11. The battery cell according to claim 10, characterized in that, The insulating element is located on the side of the housing facing the hydrogen-absorbing element.

12. The battery cell according to claim 10 or 11, characterized in that, The hydrogen absorption assembly further includes an adhesive component, which includes a support layer and an adhesive layer. The adhesive layer is connected to the main body and the air-absorbing bag, respectively. The support layer is located on the side of the adhesive layer facing the outer shell.

13. The battery cell according to any one of claims 3-11, characterized in that, Along the thickness direction of the battery cell, the orthogonal projection of the hydrogen absorption element onto the electrode assembly falls within the range of the main body, and the thickness direction of the battery cell, the first direction, and the second direction are perpendicular to each other.

14. The battery cell according to claim 13, characterized in that, Along the first direction, the size of the main body is H1, and the size of the hydrogen absorption element is H2, wherein H1 and H2 satisfy: H2≤H1; Along the second direction, the size of the main body is L1, and the size of the hydrogen absorption element is L2, where L1 and L2 satisfy: L2≤L1.

15. The battery cell according to claim 13, characterized in that, Along the thickness direction of the battery cell, the orthographic projection of the hydrogen absorption element falls within the orthographic projection range of the insulating element.

16. The battery cell according to claim 15, characterized in that, Along the first direction, the size of the hydrogen-absorbing element is H2, and the size of the insulating element is H3, wherein H3 and H2 satisfy: H2≤H3; Along the second direction, the extension length of the hydrogen-absorbing element is L2, and the extension length of the insulating element is L3, wherein L3 and L2 satisfy: L2≤L3.

17. The battery cell according to claim 2, characterized in that, The hydrogen absorption element is connected to at least one side of the encapsulation film facing the receiving cavity.

18. The battery cell according to claim 17, characterized in that, The insulating element is disposed on the side of the encapsulation film facing the receiving cavity, and the hydrogen-absorbing element is disposed on the side of the insulating element away from the encapsulation film. Along the thickness direction of the battery cell, the orthographic projection of the hydrogen-absorbing element on the encapsulation film falls within the orthographic projection range of the insulating element on the encapsulation film.

19. The battery cell according to any one of claims 1-11, characterized in that, The hydrogen absorption element comprises one of zirconium alloy, magnesium alloy, titanium alloy, vanadium alloy, or LaxNiyMz. M includes one of Zr, Mn, Mg, Zn, Al, Ti, Fe, Cu, Co, Y, Ca or Bi, where 0 < x ≤ 2, 0 ≤ y ≤ 7, and 0 ≤ z ≤ 3.

20. The battery cell according to claim 19, characterized in that, The battery cell satisfies at least one of the following conditions: 0.3≤x≤1； 1≤y≤5； 0≤z≤1； M includes one of Al, Mn, Mg, Fe, Y, or Bi; The titanium alloy includes one of TiNi, Ti2Ni, TiFe, or TiMn2; The magnesium alloy includes one of Mg2Ni, Mg2Cu, Mg2Co, Mg2Al, Mg2Cr or Mg2Te; The zirconium alloy includes one of ZrV2, ZrCr2 or ZrMn2; The vanadium-based alloy includes V3TiNi. 0.56 M1m, m=0.046-0.24, M1 includes one of Al, Si, Fe, Cu or Zr.

21. The battery cell according to claim 20, characterized in that, The hydrogen absorption components include La 0.5 Ni 4.5 Y 0.5 LaNi 3.5 Mn 0.2 YBi 0.3 LaNi 3.5 Mn 0.6 Y 0.4 Bi 0.5 LaNi 3.5 Mn 0.2 Y 0.4 Bi 0.9 LaTi 3.5 Fe 0.4 Zr 0.5 Bi 0.6 LaTi 3.5 Fe 0.4 Zr 0.5 Mg 0.6 LaNi 4.26 Al 0.08 Mg 0.16 Or La 0.43 Y 0.57 Ni 4.5 Al 0.08 Mn 0.3 One of them.

22. The battery cell according to any one of claims 1-11, characterized in that, The active metal element includes one of lithium, sodium, potassium, zinc, or aluminum.

23. The battery cell according to any one of claims 1-11, characterized in that, The solvent includes ether solvents, which include one of 1,2-dimethoxypropane, dimethoxymethane, ethylene glycol dimethyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, pentaethylene glycol dimethyl ether, polyethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol diethyl ether, triethylene glycol diethyl ether, tetraethylene glycol diethyl ether, pentaethylene glycol diethyl ether, ethylene glycol dibutyl ether, diethylene glycol dibutyl ether, or 1,3-dioxopentane.

24. The battery cell according to any one of claims 1-11, characterized in that, The solvent includes ester solvents, which include one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl 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, or diethyl sulfone.

25. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-24.

26. An electrical appliance, characterized in that, The electrical equipment includes the battery device as described in claim 25, the battery device being used to provide electrical energy.

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