Battery and electric equipment

Abstract

The utility model discloses a battery and electric equipment, and the battery comprises a shell which is provided with a storage cavity; the battery cell is arranged in the storage cavity, the battery cell comprises a main body and a tab, the main body comprises a first end and a second end which are opposite to each other, and the tab is connected to the first end and protrudes relative to the first end; and the protection piece is arranged in the storage cavity, and the two sides of the protection piece are connected to the second end and the cavity wall of the storage cavity correspondingly. The battery provided by the utility model can have relatively high safety.

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 comprises a casing and battery cells. The casing has a storage cavity for holding the battery cells. The battery cells are typically rectangular in shape, as is the casing; in some cases, the casing is rounded. After the battery cells are placed in the casing, during battery reliability testing, the cells may move around inside the storage cavity. When the cells move, their corners may collide with the corners of the casing, causing active material at the corners of the cells to detach, puncture the separator, and cause an internal short circuit. This can further lead to cell fire and failure. Thus, the battery's safety is relatively low. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a battery that has high safety.

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

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

[0006] The casing has a storage cavity;

[0007] A battery cell is disposed in the storage cavity. The battery cell includes a body and a tab. The body includes a first end and a second end opposite to each other. The tab is connected to the first end and protrudes relative to the first end.

[0008] A protective element is disposed in the storage cavity, with its two sides respectively connected to the second end and the cavity wall of the storage cavity.

[0009] The battery according to the embodiments of this utility model has at least the following beneficial effects: A protective element is disposed between the second end and the cavity wall of the storage chamber. In the prior art, there is no protective element between the cell and the cavity wall of the storage chamber. Therefore, the cell is not only prone to shaking, but its edges are also prone to impacting the edges of the casing. In this application, the protective element not only effectively prevents the second end of the main body from shaking in the storage chamber, but also makes it less likely for the second end of the main body to impact the edges of the casing, which effectively improves battery safety. Specifically, the battery can have higher safety.

[0010] According to some embodiments of the present invention, the battery body further includes a positive electrode plate, a negative electrode plate, and a separator. The separator is located between the positive electrode plate and the negative electrode plate. Along the length direction of the battery cell, the separator protrudes relative to the negative electrode plate, and the dimension of the separator protruding relative to the negative electrode plate after being disposed in the storage cavity is S. The distance between the negative electrode plate and the cavity wall of the storage cavity is L. The thickness of the protective member is T, where L>T≥LS-0.1mm.

[0011] According to some embodiments of the present invention, the battery has S≥0.05mm.

[0012] According to some embodiments of the present invention, the battery of the storage cavity includes a first wall, two opposing second walls, and two opposing third walls. The second walls and the third walls surround the edge connected to the first wall. The connection between the second wall and the third wall has a first chamfer with a radius of R1. The main body also includes a third end, the two ends of which are respectively connected to the first end and the second end. The distance between the third end and the cavity wall of the storage cavity is W. The depth of the storage cavity is D, where W≤R1≤0.3*D+2.1mm.

[0013] According to some embodiments of the present invention, the battery of the storage cavity includes a first wall, two opposing second walls, and two opposing third walls. The second walls and the third walls surround the edge connected to the first wall. The connection between the second wall and the first wall, and the connection between the third wall and the first wall, both have a second chamfer. The radius of the second chamfer is R2. The main body also includes a positive electrode, a negative electrode, and a separator. The separator is located between the positive electrode and the negative electrode. Along the length direction of the battery cell, the separator protrudes relative to the negative electrode. The dimension of the separator protruding relative to the negative electrode after being disposed in the storage cavity is S. The distance between the negative electrode and the cavity wall of the storage cavity is L, where S+0.2mm≤R2≤L.

[0014] According to some embodiments of the present invention, the deformation percentage of the protective component in the battery is F, where 0%≤F≤5%.

[0015] According to some embodiments of the present invention, the protective component of the battery is made of one of the following materials: polypropylene, polyethylene, polyethylene terephthalate, polyvinyl chloride, and polystyrene.

[0016] According to some embodiments of the present invention, the projection of the protective member falls on the projection of the main body along the thickness direction of the protective member.

[0017] The electrical device according to the second aspect of the present invention includes the battery described in any one of the first aspect embodiments.

[0018] The electrical device according to the embodiments of this utility model has at least the following beneficial effects: A protective component is disposed between the second end and the cavity wall of the storage chamber. In the prior art, there is no protective component between the battery cell and the cavity wall of the storage chamber. Therefore, the battery cell is not only prone to shaking, but its edges and corners are also prone to impacting the edges and corners of the casing. In this application, the protective component not only effectively prevents the second end of the main body from shaking in the storage chamber, but also makes it less likely for the second end of the main body to impact the edges and corners of the casing, which effectively improves battery safety. Specifically, the battery can have higher safety. Furthermore, the electrical device with this battery also has higher safety.

[0019] 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

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0021] Figure 1 This is a schematic diagram of a battery according to the first embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of a battery according to the second embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of a battery according to the third embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the battery according to the fourth embodiment of the present invention.

[0025] Figure label:

[0026] Battery 10, casing 100, storage cavity 110, first wall 111, second wall 112, third wall 113, first chamfer 114, second chamfer 115, cell 200, main body 210, first end 211, second end 212, third end 213, negative electrode 214, separator 215, tab 220, protective component 300. Detailed Implementation

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.).

[0037] 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 positive electrode active materials for batteries 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 manganese iron phosphate, and lithium manganese iron phosphate and carbon composites. Examples of lithium transition metal oxides may include, but are not limited to, at least one of lithium cobalt oxides (such as LiCoO2), lithium nickel oxides (such as LiNiO2), lithium manganese oxides (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxides, lithium manganese cobalt oxides, lithium nickel manganese oxides, lithium nickel cobalt manganese oxides (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (also abbreviated as NCM333), LiNi0.5Co0.2Mn0.3O2 (also abbreviated as NCM523), LiNi0.5Co0.25Mn0.25O2 (also abbreviated as NCM211), LiNi0.6Co0.2Mn0.2O2 (also abbreviated as NCM622), LiNi0.8Co0.1Mn0.1O2 (also abbreviated as NCM811), lithium nickel cobalt aluminum oxides (such as LiNi0.85Co0.15Al0.05O2) and their modified compounds.

[0038] 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.

[0039] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0040] 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.).

[0041] 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.

[0042] 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.

[0043] 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.

[0044] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0045] In some implementations, the battery cell also includes an isolation element disposed between the positive and negative terminals.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0053] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0054] 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.

[0055] 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.

[0056] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0057] In some implementations, the battery cell has a wound structure. The positive and negative electrode plates are wound into a wound structure.

[0058] In some implementations, the battery cell has a laminated structure.

[0059] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0060] 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.

[0061] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0062] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0063] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0064] 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.

[0065] In some embodiments, the battery may include a casing. The casing is used to encapsulate components such as the battery cell and electrolyte. The casing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] In related technologies, batteries include a casing and battery cells. The casing has a storage cavity for holding the battery cells. The battery cells are typically cuboid in shape, and the casing is also typically cuboid in shape; in some cases, the casing is rounded. After the battery cells are placed in the casing, during battery reliability testing, the cells may shake inside the storage cavity. When the cells shake, their corners may collide with the corners of the casing, causing active material at the corners of the cells to detach, puncture the separator, and cause an internal short circuit. This can further lead to cell fire and failure. Thus, the battery safety is low. Therefore, this application proposes a battery.

[0072] Please refer to Figures 1 to 4In some embodiments, the battery 10 includes a casing 100, a cell 200, and a protective element 300. The casing 100 has a storage cavity 110, and the casing 100 is made of a metal material, such as a steel casing or an aluminum casing. The casing 100 has a cuboid or cube shape. The thickness of the casing 100 can be from 50 μm to 250 μm. The cell 200 is disposed in the storage cavity 110. The cell 200 includes a body 210 and tabs 220. The body 210 is formed by stacking positive and negative electrode sheets 214, which can be rectangular or square in shape. The body 210 includes a first end 211 and a second end 212 opposite to each other. The tab 220 is connected to the first end 211 and protrudes relative to the first end 211. That is, the tab 220 is connected to the head of the body 210. The tab 220 includes a positive tab 220 and a negative tab 220. The positive electrode plate is connected to the positive tab 220, and the negative electrode plate 214 is connected to the negative tab 220. A protective member 300 is disposed in the storage cavity 110, with its two sides connected to the second end 212 and the cavity wall of the storage cavity 110, respectively. Specifically, the protective member 300 is disposed between the second end 212 and the cavity wall of the storage cavity 110. In the prior art, there is no protective member 300 between the cell 200 and the cavity wall of the storage cavity 110. Therefore, the cell 200 is not only prone to shaking, but its edges are also prone to impacting the edges of the casing 100. In this application, the protective member 300 not only effectively prevents the second end 212 of the main body 210 from shaking in the storage cavity 110, but also makes it less likely for the second end 212 of the main body 210 to impact the edges of the casing 100, which effectively improves the safety of the battery 10. Specifically, battery 10 has a high level of safety.

[0073] Further, please refer to Figure 4In some embodiments, the main body 210 further includes a positive electrode plate, a negative electrode plate 214, and a separator 215. The separator 215 is located between the positive electrode plate and the negative electrode plate 214. Along the length of the cell 200, the separator 215 protrudes relative to the negative electrode plate 214, and the protrusion of the separator 215 relative to the negative electrode plate 214 after being placed in the storage cavity 110 is S. The distance between the negative electrode plate 214 and the cavity wall of the storage cavity 110 is L, and the thickness of the protective element 300 is T, where L > T ≥ LS - 0.1 mm. Specifically, when T is less than LS - 0.1 mm, because the thickness of the protective element 300 is too small, the protective element 300 cannot provide good protection for the cell 200 and cannot effectively prevent the cell 200 from shaking and being damaged. When T is greater than or equal to L, this will result in an excessively large distance between the main body 210 and the cavity wall of the storage cavity 110, thereby indirectly reducing the size of the main body 210 and resulting in a lower energy density of the battery 10. For example, S=0.1mm, T=0.7mm, L=0.8mm, or S=0.05mm, T=0.79mm, L=0.8mm.

[0074] Furthermore, in some embodiments, S ≥ 0.05 mm. S can be 0.05 mm, 0.06 mm, or 0.1 mm. Wherein, when the size of the separator 215 protruding from the negative electrode 214 after being disposed in the storage cavity 110 is small, this may result in a poorer effect of the separator 215 in separating the positive and negative electrode 214, thereby reducing the safety of the battery 10.

[0075] Further, please refer to Figures 2 to 4 In some embodiments, the cavity wall of the storage cavity 110 includes a first wall 111, two opposing second walls 112, and two opposing third walls 113. The two second walls 112 and the two third walls 113 surround the edge connected to the first wall 111, wherein the connection between the second walls 112 and the third walls 113 has a first chamfer 114 with a radius of R1. The main body 210 also includes a third end 213, with its two ends connected to the first end 211 and the second end 212, respectively. The first end 211 can be the head of the main body 210, the second end 212 can be the tail of the main body 210, and the third end 213 can be the side of the main body 210. The distance between the third end 213 and the cavity wall of the storage cavity 110 is W, and the depth of the storage cavity 110 is D, where W≤R1≤0.3*D+2.1mm. Specifically, when R1 is less than W, the stress is concentrated at the corners of the housing 100 due to the smaller size of R1, which leads to lower strength of the housing 100. When R1 is greater than 0.3*D+2.1mm, the larger size of R1 results in a closer distance between the main body 210 and the first chamfer 114, thereby increasing the risk of the battery cell 200 impacting the housing 100.

[0076] Further, please refer to Figures 1 to 4 In some embodiments, the cavity wall of the storage cavity 110 includes a first wall 111, two opposing second walls 112, and two opposing third walls 113. The two second walls 112 and the two third walls 113 surround the edge connected to the first wall 111. The connection points between the second walls 112 and the first wall 111, and between the third walls 113 and the first wall 111, each have a second chamfer 115 with a radius of R2. The main body 210 also includes a positive electrode plate, a negative electrode plate 214, and a separator 215, with the separator 215 located between the positive electrode plate and the negative electrode plate 214. Along the length of the cell 200, the separator 215 protrudes relative to the negative electrode plate 214, and the protrusion dimension of the separator 215 relative to the negative electrode plate 214 after being disposed in the storage cavity 110 is S. The distance between the negative electrode plate 214 and the cavity wall of the storage cavity 110 is L, where S + 0.2 mm ≤ R2 ≤ L. Specifically, when R2 is less than S+0.2mm, the stress is concentrated at the corners of the housing 100 due to the smaller size of R2, which leads to lower strength of the housing 100. When R2 is greater than L, the larger size of R2 results in a closer distance between the main body 210 and the second chamfer 115, thereby increasing the risk of the battery cell 200 impacting the housing 100.

[0077] Furthermore, in some embodiments, the deformation percentage of the protective component 300 is F, where 0% ≤ F ≤ 5%. The deformation percentage refers to the ratio between the deformation of an object and its original size after being subjected to an external force, usually expressed as a percentage. That is, the protective component 300 can have a certain degree of elasticity, providing a buffering effect on the battery cell 200 when the battery 10 is dropped. F can be 1%, 2%, or 5%. When F is greater than 5%, the deformation of the protective component 300 is relatively large, which increases the risk of the battery cell 200 impacting the casing 100.

[0078] Furthermore, in some embodiments, the protective component 300 is made of one of the following materials: polypropylene, polyethylene, polyethylene terephthalate, polyvinyl chloride, and polystyrene. Specifically, the protective component 300 can be made of polypropylene or polyethylene, etc. These materials are lightweight, have good chemical resistance, and are low in cost. When the protective component 300 is made of these materials, the battery 10 also becomes lightweight and low in cost.

[0079] Furthermore, in some embodiments, along the thickness direction of the protective member 300, the projection of the protective member 300 falls on the projection of the main body 210. Specifically, the projection of the protective member 300 falling on the projection of the main body 210 along the thickness direction can be that the length and width of the protective member 300 are both less than the length and width of the second end 212 of the main body 210, or the length and width of the protective member 300 are both equal to the length and width of the second end 212 of the main body 210. If the width and length of the protective member 300 are greater than the width and length of the main body 210, then the energy density of the battery 10 will be lower.

[0080] In some embodiments, the electrical device includes the battery 10 of any of the above embodiments. Specifically, the protective member 300 is disposed between the second end 212 and the cavity wall of the storage cavity 110. In the prior art, there is no protective member 300 between the cell 200 and the cavity wall of the storage cavity 110. Therefore, the cell 200 is not only prone to shaking, but its corners are also prone to impacting the corners of the casing 100. In this application, the protective member 300 not only effectively prevents the second end 212 of the main body 210 from shaking in the storage cavity 110, but also makes it less likely for the second end 212 of the main body 210 to impact the corners of the casing 100, which can effectively improve the safety of the battery 10. Specifically, the battery 10 can have higher safety. Furthermore, the electrical device with this battery 10 also has higher safety.

[0081] 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: The casing has a storage cavity; A battery cell is disposed in the storage cavity. The battery cell includes a body and a tab. The body includes a first end and a second end opposite to each other. The tab is connected to the first end and protrudes relative to the first end. A protective element is disposed in the storage cavity, with its two sides respectively connected to the second end and the cavity wall of the storage cavity.

2. The battery according to claim 1, characterized in that, The main body also includes a positive electrode plate, a negative electrode plate, and a separator. The separator is located between the positive electrode plate and the negative electrode plate. Along the length direction of the cell, the separator protrudes relative to the negative electrode plate, and the dimension of the separator protruding relative to the negative electrode plate after being disposed in the storage cavity is S. The distance between the negative electrode plate and the cavity wall of the storage cavity is L. The thickness of the protective component is T, where L>T≥LS-0.1mm.

3. The battery according to claim 2, characterized in that, S≥0.05mm.

4. The battery according to claim 1, characterized in that, The storage cavity wall includes a first wall, two opposing second walls, and two opposing third walls. The second walls and the third walls surround the edge connected to the first wall. The connection between the second walls and the third walls has a first chamfer with a radius of R1. The main body also includes a third end, with its two ends connected to the first end and the second end, respectively. The distance between the third end and the storage cavity wall is W. The depth of the storage cavity is D, where W≤R1≤0.3*D+2.1mm.

5. The battery according to claim 1, characterized in that, The storage cavity wall includes a first wall, two opposing second walls, and two opposing third walls. The second walls and the third walls surround the edge connected to the first wall. The connection between the second wall and the first wall, and the connection between the third wall and the first wall, both have a second chamfer. The radius of the second chamfer is R2. The main body also includes a positive electrode plate, a negative electrode plate, and a separator. The separator is located between the positive electrode plate and the negative electrode plate. Along the length direction of the cell, the separator protrudes relative to the negative electrode plate, and the dimension of the separator protruding relative to the negative electrode plate after being disposed in the storage cavity is S. The distance between the negative electrode plate and the cavity wall of the storage cavity is L, where S+0.2mm≤R2≤L.

6. The battery according to claim 1, characterized in that, The deformation percentage of the protective component is F, where 0% ≤ F ≤ 5%.

7. The battery according to claim 1, characterized in that, The protective component is made of one of the following materials: polypropylene, polyethylene, polyethylene terephthalate, polyvinyl chloride, and polystyrene.

8. The battery according to claim 1, characterized in that, Along the thickness direction of the protective element, the projection of the protective element falls on the projection of the main body.

9. Electrical equipment, characterized in that, Includes the battery as described in any one of claims 1 to 8.

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