Battery and electric equipment

Abstract

The utility model discloses a battery and electric equipment, the battery includes: a housing having a storage cavity, the cavity wall of the storage cavity including a first surface; the isolation piece comprises a body part and two protruding parts, the two protruding parts are connected to the two ends of the body part respectively, the protruding parts protrude relative to the body part, the protruding parts are welded to the first face so that the storage cavity can be divided into a plurality of containing cavities, and the containing cavities are arranged in the thickness direction of the first face. The projection area of the protruding part is larger than that of the body part. And the battery cell is arranged in the accommodating cavity. The battery provided by the utility model not only has higher energy density, but also has higher reliability.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery and electrical equipment. Background Technology

[0002] In related technologies, a battery includes a casing and battery cells. The casing has storage chambers, and the battery cells are placed in the storage chambers. To improve the energy density of the battery, multiple battery cells can be placed in the storage chambers and then separated from each other. Specifically, by welding separators to the casing, the storage chambers are divided into multiple cavities, thus accommodating multiple battery cells. However, if the thickness of the separators is too large, the size of the battery cells will decrease given a fixed battery size, thereby reducing the battery's energy density. Conversely, if the thickness of the separators is too small, the welding effect between the separators and the casing will be poor, thus reducing the battery's reliability. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a battery that not only has high energy density but also high reliability.

[0004] This utility model also proposes an electrical device.

[0005] The battery according to a first aspect embodiment of the present invention includes:

[0006] A housing having a storage cavity, the cavity wall of which includes a first surface;

[0007] The separator includes a body and two protrusions. The two protrusions are respectively connected to both ends of the body and protrude relative to the body. The protrusions are welded to the first surface to divide the storage cavity into multiple receiving cavities. Along the thickness direction of the first surface, the projected area of ​​the protrusion is larger than the projected area of ​​the body.

[0008] The battery cell is disposed in the receiving cavity.

[0009] The battery according to the embodiments of this utility model has at least the following beneficial effects: The separator includes a body and two protrusions, which are respectively connected to both ends of the body and protrude relative to the body. After the protrusions are welded to the first surface, the storage cavity can be divided into multiple receiving cavities, which can be used to hold multiple battery cells. Along the thickness direction of the first surface, the projected area of ​​the protrusions is larger than the projected area of ​​the body. That is, assuming the protrusions and the body are welded to the first surface respectively, the contact area between the protrusions and the first surface will be larger than the contact area between the body and the first surface. This larger contact area between the protrusions and the first surface improves the welding quality between the separator and the casing. Furthermore, since the projected area of ​​the body is smaller (the body has a smaller dimension in the length or width direction of the casing than the protrusions), the space occupied by the body in the storage cavity is smaller than the space occupied by the protrusions. This allows the storage cavity to accommodate more battery cells, thereby effectively improving the energy density of the battery. Specifically, the battery not only has a high energy density but also high reliability.

[0010] According to some embodiments of the present invention, the protrusion of the battery extends out from both sides of the body portion.

[0011] According to some embodiments of the present invention, the battery has a body portion with a dimension of A and a protrusion portion with a dimension of B along the direction in which the protrusion protrudes relative to the body portion, and 0.5 ≤ (BA) / 2A ≤ 20.

[0012] According to some embodiments of the present invention, the battery has a body portion with a size of A and a protrusion portion with a size of B along the direction in which the protrusion protrudes relative to the body portion, and 50um ≤ (BA) / 2 ≤ 300um.

[0013] According to some embodiments of the present invention, the battery has a capacity of 25µm ≤ A ≤ 150µm.

[0014] According to some embodiments of the present invention, the battery has a 150um ≤ B ≤ 1000um.

[0015] According to some embodiments of the present invention, the size of the protrusion is C along a first direction, where 50um ≤ C ≤ 300um, and the first direction is perpendicular to the direction in which the protrusion protrudes relative to the body portion.

[0016] According to some embodiments of the present invention, in the battery, both of the protrusions protrude relative to the body portion in the same direction.

[0017] According to some embodiments of the present invention, the two protrusions protrude in different directions relative to the main body portion.

[0018] The electrical device according to a second aspect embodiment of the present invention includes a battery as described in any one of the first aspect embodiments.

[0019] The electrical device according to the embodiments of this utility model has at least the following beneficial effects: The separator includes a main body and two protrusions, which are respectively connected to both ends of the main body and protrude relative to the main body. After the protrusions are welded to the first surface, the storage cavity can be divided into multiple receiving cavities, which can be used to hold multiple battery cells. Along the thickness direction of the first surface, the projected area of ​​the protrusions is larger than the projected area of ​​the main body. That is, assuming the protrusions and the main body are welded to the first surface respectively, the contact area between the protrusions and the first surface will be larger than the contact area between the main body and the first surface. The larger contact area between the protrusions and the first surface can improve the welding quality of the separator and the housing. Furthermore, since the projected area of ​​the main body is smaller (the main body has a smaller dimension in the length or width direction of the housing than the protrusions), the space occupied by the main body in the storage cavity is smaller than the space occupied by the protrusions. This allows the storage cavity to accommodate more battery cells, thereby effectively improving the energy density of the battery. Specifically, the battery not only has a high energy density but also high reliability. Furthermore, electrical devices equipped with this battery not only have better battery life but also higher reliability.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0022] Figure 1 This is a schematic diagram of a battery according to the first embodiment of the present invention;

[0023] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0024] Figure 3 This is a schematic diagram of a battery according to the second embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the battery according to the third embodiment of the present invention.

[0026] Figure label:

[0027] Battery 10, casing 100, storage cavity 110, first surface 111, second surface 112, receiving cavity 120, separator 200, body part 210, protrusion 220, and battery cell 300. Detailed Implementation

[0028] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0029] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not 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 this utility model.

[0030] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0031] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0032] In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0033] The battery 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.

[0034] A battery typically consists of a cell. The cell includes a positive electrode, a negative electrode, and a separator. During charging and discharging, active ions (such as lithium ions) move back and forth between the positive and negative electrodes, inserting and releasing. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0035] 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.

[0036] 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.

[0037] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0038] 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 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 oxides 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 NCM333), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM523), LiNi 0.5 Co 0.25Mn 0.25 O2 (also known as NCM211), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM622), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0039] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0040] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0041] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0042] 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.

[0043] 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.

[0044] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in batteries. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0045] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0046] In some implementations, the battery cell also includes an isolation element disposed between the positive and negative terminals.

[0047] In some embodiments, the separator is a separator membrane. The separator membrane can be of various types, and any known porous separator membrane with good chemical and mechanical stability can be selected.

[0048] As an example, the material of the separator may include at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or it may be attached to the surfaces of the positive and negative electrodes.

[0049] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0050] In some embodiments, the battery also includes an electrolyte that acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include an electrolyte salt and a solvent.

[0051] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0052] In some embodiments, the solvent may include at least one selected from 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, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more selected from ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0053] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0054] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0055] As an example, polymer solid electrolytes can be polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0056] As an example, inorganic solid electrolytes may include one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0057] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0058] In some implementations, the battery cell has a wound structure. The positive and negative electrode plates are wound into a wound structure.

[0059] In some implementations, the battery cell has a laminated structure.

[0060] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0061] 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.

[0062] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0063] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0064] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0065] In some implementations, the battery cell can be cylindrical, flat, or polygonal, etc.

[0066] In some implementations, the battery cell is provided with tabs that allow current to be drawn out of the cell. The tabs include a positive tab and a negative tab.

[0067] In some implementations, the battery may include a casing. The casing is used to encapsulate components such as the battery cell and electrolyte. The casing can be a steel casing, an aluminum casing, a composite metal casing (such as a copper-aluminum composite casing), etc.

[0068] The battery mentioned in the embodiments of this application refers to a single physical module that includes one or more batteries to provide higher voltage and capacity.

[0069] In some embodiments, the battery can be a battery module, and when there are multiple batteries, the multiple batteries are arranged and fixed to form a battery module.

[0070] In some embodiments, the battery may be a battery pack, which includes a housing and a battery, with the battery or battery module housed within the housing.

[0071] 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.

[0072] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0073] In related technologies, a battery includes a casing and battery cells. The casing has a storage cavity in which the battery cells are placed. To improve the energy density of the battery, multiple battery cells can be arranged in the storage cavity and then separated from each other. Specifically, the storage cavity is divided into multiple chambers by welding a separator to the casing, thus accommodating multiple battery cells. However, if the separator is too thick, the battery cell size will decrease given a fixed battery size, thereby reducing the battery's energy density; conversely, if the separator is too thin, the welding effect between the separator and the casing will be poor, reducing the battery's reliability. Therefore, this application proposes a battery.

[0074] Please refer to Figures 1 to 4 In some embodiments, the battery 10 includes a housing 100, a separator 200, and a cell 300. The housing 100 has a storage cavity 110, the cavity wall of which includes a first surface 111. Specifically, the housing 100 can be made of metal, such as aluminum or stainless steel. The shape of the housing 100 is not specifically limited; for example, the shape of the housing 100 can be a cube, cuboid, or cylinder. When the housing 100 is cuboid, the cavity wall of the storage cavity 110 includes two opposing first surfaces 111, two opposing second surfaces 112, and two opposing third surfaces. The two ends of the second surface 112 are respectively connected to the two first surfaces 111, and the two first surfaces 111 and the two second surfaces 112 together surround the edge connected to the third surface. The separator 200 includes a body portion 210 and two protrusions 220, the two protrusions 220 being respectively connected to the two ends of the body portion 210, and the protrusions 220 protruding relative to the body portion 210. The protrusion 220 is welded to the first surface 111 to divide the storage cavity 110 into multiple receiving cavities 120. Specifically, each protrusion 220 can be welded to a first surface 111, thereby dividing the storage cavity 110 into multiple receiving cavities 120. For example, one spacer 200 can divide the storage cavity 110 into two receiving cavities 120, and two spacers 200 can divide the storage cavity 110 into three receiving cavities 120. Along the thickness direction of the first surface 111, the projected area of ​​the protrusion 220 is larger than the projected area of ​​the body portion 210. In this case, the projected area of ​​the protrusion 220 along the thickness direction of the first surface 111 is greater than the projected area of ​​the body portion 210. Alternatively, the cross-sectional area of ​​the protrusion 220 along the thickness direction of the first surface 111 is greater than the cross-sectional area of ​​the body portion 210. The cross-sectional area of ​​the protrusion 220 is the area in contact with the first surface 111, and the cross-sectional area of ​​the body portion 210 is also the area in contact with the first surface 111. The battery cell 300 is disposed in the receiving cavity 120. After the insulating member 200 is welded to the housing 100, the insulating member 200 can also indirectly enhance the strength of the housing 100.

[0075] Specifically, the separator 200 includes a body portion 210 and two protrusions 220. The two protrusions 220 are respectively connected to both ends of the body portion 210, and the protrusions 220 protrude relative to the body portion 210. After the protrusions 220 are welded to the first surface 111, the storage cavity 110 can be divided into multiple receiving cavities 120. The multiple receiving cavities 120 can be used to place multiple battery cells 300. Along the thickness direction of the first surface 111, the projected area of ​​the protrusions 220 is larger than the projected area of ​​the body portion 210. That is, assuming that the protrusions 220 and the body portion 210 are respectively welded to the first surface 111, then the protrusions 220... The contact area between the protrusion 220 and the first surface 111 is larger than the contact area between the body portion 210 and the first surface 111. This increased contact area between the protrusion 220 and the first surface 111 improves the welding quality between the separator 200 and the housing 100. Furthermore, since the projected area of ​​the body portion 210 is smaller (the body portion 210 has a smaller dimension in the length or width direction of the housing 100 than the protrusion 220), the space occupied by the body portion 210 in the storage cavity 110 is smaller than that occupied by the protrusion 220. This allows the storage cavity 110 to accommodate more battery cells 300, thereby effectively increasing the energy density of the battery 10. Specifically, the battery 10 not only has a high energy density but also high reliability.

[0076] Furthermore, after the aforementioned protrusion 220 connects to the main body 210, the protrusion 220 protrudes relative to the main body 210. There are various ways in which the protrusion 220 protrudes relative to the main body 210, which will be described in turn below. For details, please refer to... Figure 1 In some embodiments, the protrusion 220 protrudes from both sides of the body portion 210. That is, the shape of the separator 200 can be "I" shaped. In this way, the protrusion 220 not only has a large welding area with the first surface 111, but also the width of the body portion 210 is small, which can improve the energy density of the battery 10.

[0077] Further, please refer to Figure 2In some embodiments, along the direction in which the protrusion 220 protrudes relative to the body portion 210, the size of the body portion 210 is A, and the size of the protrusion 220 is B, where 0.5 ≤ (BA) / 2A ≤ 20. (BA) / 2A can be equal to 0.5, 1, 2, 3, 5, 6, 7, 9, 10, 12, 15, 16, 17, 18, 19, or 20. When (BA) / 2A is less than 0.5, the size of B is too small, resulting in a small contact area between the protrusion 220 and the first surface 111, leading to poor welding quality between the separator 200 and the housing 100. Alternatively, the size of A is too large, causing the body portion 210 to occupy too much space in the storage cavity 110, reducing the energy density of the battery 10. When (BA) / 2A is greater than 20, the size of B is too large, potentially causing the protrusion 220 to damage the cell 300, thereby damaging the cell 300. Alternatively, if the size of A is too small, this will result in insufficient strength of the body part 210.

[0078] Further, please refer to Figure 2 In some embodiments, along the direction in which the protrusion 220 protrudes relative to the body portion 210, the size of the body portion 210 is A, and the size of the protrusion 220 is B, where 50µm ≤ (BA) / 2 ≤ 300µm. Specifically, (BA) / 2 can be equal to 50µm, 60µm, 80µm, 90µm, 100µm, 120µm, 150µm, 180µm, 200µm, 240µm, 250µm, 280µm, 290µm, or 300µm. When (BA) / 2 is less than 50µm, the size of B is too small, which results in a small contact area between the protrusion 220 and the first surface 111, leading to poor welding quality between the separator 200 and the housing 100. Alternatively, the size of A is too large, which results in the body portion 210 occupying too much space in the storage cavity 110, reducing the energy density of the battery 10. When (BA) / 2 is greater than 300µm, the size of B is too large, which may cause the protrusion 220 to damage the cell 300, thereby damaging the cell 300. Alternatively, the size of A is too small, which will result in the body portion 210 having insufficient strength.

[0079] Furthermore, in some embodiments, 25µm ≤ A ≤ 150µm. Specifically, A can be 25µm, 30µm, 40µm, 50µm, 60µm, 70µm, 80µm, 90µm, 100µm, 120µm, 130µm, 140µm, or 150µm. When the size of A is too small, the separator 200 becomes too thin and easily deformed and damaged, which reduces the reliability of the battery 10. When the size of A is too large, this results in the separator 200 being too heavy and the energy density of the battery 10 being low. Additionally, in some embodiments, 50µm ≤ A ≤ 100µm. For example, 50µm, 60µm, 70µm, 80µm, 90µm, or 100µm.

[0080] Furthermore, in some embodiments, 150um ≤ B ≤ 1000um. Specifically, B can be 150um, 160um, 180um, 200um, 210um, 250um, 300um, 350um, 400um, 450um, 500um, 550um, 600um, 650um, 700um, 750um, 800um, 850um, 900um, 950um, or 1000um. When the size of B is too small, it will not meet the requirements of welding manufacturing and the reliability of battery 10. When the size of B is too large, it may cause the protrusion 220 to damage the cell 300. Additionally, in some embodiments, 200um ≤ B ≤ 400um. For example, 200um, 210um, 220um, 230um, 240um, 250um, 260um, 270um, 280um, 290um, 300um, 310um, 320um, 330um, 340um, 350um, 360um, 370um, 380um, 390um, or 400um.

[0081] Further, please refer to Figure 2In some embodiments, the size of the protrusion 220 along the first direction is C, where 50µm ≤ C ≤ 300µm, and the first direction is perpendicular to the direction in which the protrusion 220 protrudes relative to the body portion 210. That is, the size of the protrusion 220 along the first direction is C, where C refers to the thickness of the protrusion 220. C can be 50µm, 60µm, 70µm, 80µm, 90µm, 100µm, 150µm, 200µm, 250µm, or 300µm. When the size of C is too small, the welding depth between the protrusion 220 and the first surface 111 is insufficient, which can easily cause cracking in the welding area and reduce welding quality. When the size of C is too large, the protrusion 220 may damage the battery cell 300. Additionally, in some embodiments, 75µm ≤ C ≤ 150µm. For example, 75um, 85um, 95um, 100um, 110um, 115um, 120um, 130um, 140um, or 150um.

[0082] In addition to the aforementioned protrusion 220 protruding from both sides of the main body 210, the spacer 200 also has another structure, please refer to Figure 3 Furthermore, in some embodiments, both protrusions 220 protrude relative to the body portion 210 in the same direction. Specifically, the separator 200 may be in the shape of an "U", so that the protrusion 220 and the first surface 111 have a larger contact area, thereby improving the welding quality of the separator 200 and the housing 100, and also improving the energy density of the battery 10 due to the smaller width of the body portion 210.

[0083] In addition to the aforementioned protrusion 220 protruding from both sides of the main body 210, the spacer 200 also has another structure, further described in [reference needed]. Figure 4 In some embodiments, the two protrusions 220 protrude in different directions relative to the body portion 210. Specifically, the protrusions 220 and the first surface 111 have a large contact area, which can improve the welding quality of the separator 200 and the housing 100, and can also improve the energy density of the battery 10 due to the smaller width of the body portion 210.

[0084] In some embodiments, the electrical device includes the battery 10 of any of the above embodiments. Specifically, the separator 200 includes a body portion 210 and two protrusions 220. The two protrusions 220 are respectively connected to both ends of the body portion 210, and the protrusions 220 protrude relative to the body portion 210. After the protrusions 220 are welded to the first surface 111, the storage cavity 110 can be divided into multiple receiving cavities 120. The multiple receiving cavities 120 can be used to place multiple battery cells 300. The projected area of ​​the protrusions 220 is larger than the projected area of ​​the body portion 210 along the thickness direction of the first surface 111. That is, assuming that the protrusions 220 and the body portion 210 are respectively welded to the first surface 111, then the protrusions 220... The contact area between the protrusion 220 and the first surface 111 is larger than the contact area between the body portion 210 and the first surface 111. This increased contact area between the protrusion 220 and the first surface 111 improves the welding quality between the separator 200 and the housing 100. Furthermore, since the projected area of ​​the body portion 210 is smaller (the body portion 210 has a smaller dimension in the length or width direction of the housing 100 than the protrusion 220), the space occupied by the body portion 210 in the storage cavity 110 is smaller than that occupied by the protrusion 220. This allows the storage cavity 110 to accommodate more battery cells 300, thereby effectively increasing the energy density of the battery 10. Specifically, the battery 10 not only has a high energy density but also high reliability. Furthermore, electrical devices equipped with this battery 10 not only have better battery life but also higher reliability.

[0085] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.

Claims

1. A battery, characterized in that, include: A housing having a storage cavity, the cavity wall of which includes a first surface; The separator includes a body and two protrusions. The two protrusions are respectively connected to both ends of the body and protrude relative to the body. The protrusions are welded to the first surface to divide the storage cavity into multiple receiving cavities. Along the thickness direction of the first surface, the projected area of ​​the protrusion is larger than the projected area of ​​the body. The battery cell is disposed in the receiving cavity.

2. The battery according to claim 1, characterized in that, The protrusions extend from both sides of the body portion.

3. The battery according to claim 2, characterized in that, Along the direction in which the protrusion protrudes relative to the body portion, the size of the body portion is A, the size of the protrusion portion is B, and 0.5≤(BA) / 2A≤20.

4. The battery according to claim 2, characterized in that, Along the direction in which the protrusion protrudes relative to the body portion, the size of the body portion is A, the size of the protrusion portion is B, and 50um≤(BA) / 2≤300um.

5. The battery according to claim 4, characterized in that, 25um≤A≤150um.

6. The battery according to claim 4, characterized in that, 150um≤B≤1000um.

7. The battery according to claim 4, characterized in that, Along the first direction, the size of the protrusion is C, 50um≤C≤300um, and the first direction is perpendicular to the direction in which the protrusion protrudes relative to the body portion.

8. The battery according to claim 1, characterized in that, Both of the protrusions protrude relative to the body portion in the same direction.

9. The battery according to claim 1, characterized in that, The two protrusions protrude in different directions relative to the body portion.

10. Electrical equipment, characterized in that, Includes the battery as described in any one of claims 1 to 9.

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