Battery and electric equipment

Abstract

The utility model discloses a battery and electric equipment, the battery includes: a casing including a middle frame and a cover plate, the middle frame includes a body piece and a protruding piece, the body piece is arranged in a surrounding manner to form an accommodating space, the protruding piece is connected to one end of the body piece, and the cover plate is arranged on the middle frame; the protruding part faces the interior of the containing space and protrudes relative to the body part, and the cover plate is connected to the protruding part and the body part so as to seal the containing space; the battery cell is arranged in the accommodating space; wherein in the width direction of the battery, the protruding size of the protruding piece relative to the body piece is A, the thickness of the body piece is C, and A / C is larger than or equal to 1 and smaller than or equal to 3. According to the battery disclosed by the utility model, the energy density can be effectively improved, and the battery core can be effectively prevented from being damaged.

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 a cell. The casing includes a mid-frame and a cover plate. The mid-frame has a storage cavity, in which the cell is located. The cover plate is welded to the mid-frame to seal the storage cavity. Furthermore, the mid-frame typically has a flange edge, and the cover plate is welded to the mid-frame via this flange edge. The flange edge can lead to a lower energy density in the battery. To address this issue, existing mid-frames extend the flange edge towards the center of the storage cavity, forming a flange that extends inward. However, this flange design can damage the cell. 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 can not only effectively improve energy density but also effectively prevent damage to the battery cell.

[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 includes a middle frame and a cover plate. The middle frame includes a body and a protrusion. The body is arranged around the housing to form a receiving space. The protrusion is connected to one end of the body and protrudes relative to the body towards the interior of the receiving space. The cover plate is connected to the protrusion and the body to close the receiving space.

[0007] The battery cell is disposed in the receiving space;

[0008] Wherein, along the width direction of the battery, the protrusion of the protrusion relative to the body is A, the thickness of the body is C, and 1≤A / C≤3.

[0009] The battery according to the present utility model embodiment has at least the following beneficial effects: the battery cell is disposed in the accommodating space, wherein the accommodating space can be closed after the cover plate connects the protrusion and the body. One end of the protrusion is connected to the body, and the end of the protrusion away from the body protrudes relative to the body. The protrusion of the protrusion relative to the body is A, and the thickness of the body is C. Specifically, when A and C satisfy 1≤A / C≤3, the battery can not only effectively improve the energy density, but also effectively avoid damage to the battery cell.

[0010] According to some embodiments of the present invention, the protrusion has an arcuate portion at one end away from the body, and the arcuate portion is disposed toward the battery cell.

[0011] According to some embodiments of the present invention, in the battery, along the width direction of the battery, the distance from the widest point of the cell to the body component is D, where 75μm≤A≤0.9D.

[0012] According to some embodiments of the present invention, the size of the protrusion along the thickness direction of the battery is B, where 50μm≤B≤200μm.

[0013] According to some embodiments of the present invention, the battery has 50μm≤C≤150μm; and / or 200μm≤A+C≤400μm.

[0014] According to some embodiments of the present invention, the thickness of the cover plate in the battery is M, where 25μm≤M≤250μm.

[0015] According to some embodiments of the present invention, the battery satisfies at least one of the following conditions (1) to (3):

[0016] (1) 100μm≤A≤250μm;

[0017] (2) 225μm≤A+C≤300μm;

[0018] (3) The thickness of the cover plate is M, 50μm≤M≤100μm.

[0019] According to some embodiments of the present invention, the cover plate and the middle frame are welded together.

[0020] According to some embodiments of the present invention, the battery cell and the casing are electrically connected.

[0021] The electrical device according to the second aspect of the present invention includes the battery described in any one of the first aspect embodiments.

[0022] The electrical device according to the embodiments of this utility model has at least the following beneficial effects: the battery cell is disposed in the receiving space, wherein the receiving space can be closed after the cover plate connects the protruding part and the body part. One end of the protruding part is connected to the body part, and the end of the protruding part away from the body part protrudes relative to the body part. The protrusion of the protruding part relative to the body part is A, and the thickness of the body part is C. Specifically, when A and C satisfy 1≤A / C≤3, the battery can not only effectively improve the energy density, but also effectively avoid damage to the battery cell. Furthermore, the electrical device with this battery has better safety and battery life.

[0023] 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

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0025] Figure 1 This is a schematic diagram of a battery according to the first embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of a battery according to the second embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of a battery according to the third embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the battery according to the fourth embodiment of the present invention.

[0029] Figure label:

[0030] Battery 10, casing 100, middle frame 110, main body 111, accommodating space 112, protrusion 113, arc portion 114, cover plate 120, battery cell 200. Detailed Implementation

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.).

[0041] 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 0.25 Mn 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.

[0042] 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.

[0043] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0044] 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.).

[0045] 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.

[0046] 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.

[0047] 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.

[0048] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0049] In some implementations, the battery cell also includes an isolation element disposed between the positive and negative terminals.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0057] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0058] 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.

[0059] 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.

[0060] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0061] In some implementations, the battery cell has a wound structure. The positive and negative electrode plates are wound into a wound structure.

[0062] In some implementations, the battery cell has a laminated structure.

[0063] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0064] 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.

[0065] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0066] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0067] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0068] In some implementations, the battery cell can be cylindrical, flat, or polygonal, etc.

[0069] 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.

[0070] 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 may be made of steel, aluminum, or other materials.

[0071] As an example, the battery can be a cylindrical battery, a prismatic battery, a pouch battery, or a battery of other shapes. Prismatic batteries include, but are not limited to, square-shell batteries, blade-shaped batteries, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] In related technologies, a battery includes a casing and a cell. The casing includes a middle frame and a cover plate. The middle frame has a storage cavity, in which the cell is located. The cover plate is welded to the middle frame to seal the storage cavity. Furthermore, the middle frame typically has a flange edge, and the cover plate is welded to the middle frame via the flange edge. The flange edge can lead to a lower energy density in the battery. To address this issue, existing middle frames extend the flange edge towards the center of the storage cavity, forming a flange that extends inward. However, this flange design can damage the cell. Therefore, this application proposes a battery.

[0078] Please refer to Figures 1 to 3In some embodiments, the battery 10 includes a housing 100 and a cell 200. The housing 100 includes a middle frame 110 and a cover plate 120. Both the middle frame 110 and the cover plate 120 can be made of metal, such as copper, aluminum, iron, and stainless steel. The middle frame 110 includes a body 111 and a protrusion 113. The body 111 is arranged around the body to form a receiving space 112. The receiving space 112 can be a through hole with both ends extending through it. Two cover plates 120 are provided, and the two cover plates 120 respectively close the two openings. The protrusion 113 is connected to one end of the body 111. There are two protrusions 113, which are respectively connected to the two ends of the body 111, and the protrusions 113 protrude relative to the body 111 towards the interior of the receiving space 112. That is, after the protrusions 113 are connected to the body 111, they form an inner flange structure, which can effectively improve the energy density of the battery 10. Furthermore, the cover plate 120 is connected to the protrusion 113 and the body 111 to enclose the receiving space 112. A battery cell 200 is disposed in the receiving space 112. The battery cell 200 includes a positive electrode and a negative electrode, each having multiple positive and negative electrodes. Multiple positive and negative electrodes are alternately stacked to form the battery cell 200, or the positive and negative electrodes are stacked and then wound to form a wound-type battery cell 200. The protrusion 113 protrudes by an dimension A relative to the body 111, and the thickness of the body 111 is C, where 1 ≤ A / C ≤ 3. Specifically, A / C can be 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.0, 2.2, 2.4, 2.5, 2.8, 2.9, or 3. When A / C is less than 1, the energy density improvement of the battery 10 is relatively low. When the A / C ratio is greater than 3, the battery cell 200 may come into contact with and impact the protrusion 113, which could damage the battery cell 200. Please refer to the table below for details.

[0079]

[0080] In the table above, the drop pass rate refers to dropping battery 10 from a height of one meter, repeating this process 10 times as one round, and then observing whether battery 10 catches fire or explodes. Failure to catch fire or explode is considered a pass; otherwise, it is a fail. In the table above, the parameters of Examples 1 to 5 all satisfy the relevant formulas, and the drop pass rate is 100%, with improved energy density. Comparative Examples 1 to 4 do not satisfy A+C or A / C. Compared to Example 1, Comparative Example 1 has A+C < 200 μm, indicating insufficient welding strength between the cover plate 120 and the middle frame 110, leading to weld cracking and failure during the drop test of battery 10. Compared to Example 1, Comparative Example 2 has A / C < 1, resulting in a relatively small energy density gain for battery 10 in Comparative Example 2. Compared to Example 1, Comparative Example 3 has A+C < 200 μm and A / C < 1, indicating insufficient welding strength between the cover plate 120 and the middle frame 110, leading to weld cracking and failure during the drop test of battery 10, and a relatively small energy density gain. Compared to Example 1, Comparative Example 4 shows an A / C ratio greater than 4. The impact between the protrusion 113 and the cell 200 caused electrode damage, a micro-short circuit, and drop failure. Specifically, this battery not only effectively improves energy density but also effectively prevents cell damage.

[0081] Furthermore, the protrusion 113 on the middle frame 110 reduces its thickness and weight, thus achieving a lighter battery 10. Specifically, without the protrusion 113, the thickness and weight of the body component 111 would need to be increased after the flange edge is removed to ensure the welding quality between the body component 111 and the cover plate 120, resulting in an increase in the weight of the battery 10. However, by providing the protrusion 113, the thickness of the body component 111 can be reduced, thereby reducing the weight of the battery 10.

[0082] Furthermore, in some embodiments, the end of the protrusion 113 away from the body 111 has an arcuate portion 114, which faces the battery cell 200. Specifically, the battery cell 200 is disposed in the receiving space 112, wherein the cover plate 120, after connecting the protrusion 113 and the body 111, can close the receiving space 112. One end of the protrusion 113 is connected to the body 111, and the end of the protrusion 113 away from the body 111 has an arcuate portion 114. When the protrusion 113 contacts the battery cell 200, the arcuate portion 114 is relatively smooth and will not easily damage the battery cell 200, thereby protecting the battery cell 200. In other embodiments, the arcuate portion 114 may also be recessed, as detailed in [reference needed]. Figure 4 .

[0083] Further explanation is provided below; please refer to... Figures 1 to 3The fact that the protruding part 113 has a rounded portion 114 at the end away from the main body 111 specifically means that the end of the protruding part 113 away from the main body 111 is rounded or chamfered. If the end of the protruding part 113 away from the main body 111 has a square cross-section, then it will be rounded to make it a rounded cross-section. Alternatively, the rounded portion 114 at the end of the protruding part 113 away from the main body 111 can also be a rounded surface, with one end connected to the cover plate 120 and the other end connected to the main body 111. That is, a rounded transition surface is provided between the cover plate 120 and the main body 111, which can effectively prevent damage to the battery cell 200.

[0084] Please refer to Figure 1 Furthermore, in some embodiments, along the width direction of the battery 10, the distance from the widest point of the cell 200 to the body component 111 is D, where 75μm≤A≤0.9D. Additionally, 100μm≤A≤250μm, and 300μm≤D≤800μm. Specifically, A can be 75μm, 78μm, 80μm, 82μm, 85μm, 88μm, 90μm, 95μm, 100μm, 105μm, 110μm, 115μm, 120μm, 125μm, 150μm, 160μm, 180μm, 200μm, 220μm, 240μm, or 250μm. When A is less than 75μm, the protrusion of the protrusion 113 relative to the body component 111 is too small, failing to meet welding manufacturing requirements and battery 10 reliability requirements, thus reducing welding quality. When A is greater than 0.9D, the protrusion 113 protrudes too much relative to the body 111, which may cause the protrusion 113 to contact the cell 200, thereby damaging the cell 200. Furthermore, D can be 300μm, 350μm, 400μm, 450μm, 500μm, 550μm, 600μm, 650μm, 700μm, 750μm, or 800μm.

[0085] Further, please refer to Figure 1In some embodiments, the size of the protrusion 113 along the thickness direction of the battery 10 is B, where 50μm ≤ B ≤ 200μm. Specifically, B can be 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 95μm, 100μm, 110μm, 120μm, 130μm, 140μm, 150μm, 160μm, 170μm, 180μm, 190μm, or 200μm. When B is less than 50μm, the welding depth between the middle frame 110 and the cover plate 120 is insufficient, which can easily lead to weld cracking, thereby causing the battery 10 to fail the reliability test. When B is greater than 200μm, the thickness of the protrusion 113 is too large, which may cause the protrusion 113 to touch the cell 200, thereby damaging the cell 200.

[0086] Further, please refer to Figure 1 In some embodiments, the thickness of the body component 111 is C, where 50μm ≤ C ≤ 150μm. Specifically, C can be 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 95μm, 100μm, 105μm, 110μm, 115μm, 120μm, 125μm, 130μm, 135μm, 140μm, 145μm, or 150μm. When C is less than 50μm, the thickness of the body component 111 is too thin, that is, the thickness of the middle frame 110 is too thin, which will cause the middle frame 110 to be easily deformed and damaged, resulting in failure of reliability testing. When C is greater than 150μm, the thickness of the body component 111 is too large, that is, the thickness of the middle frame 110 is too large, which will result in a large weight of the battery 10.

[0087] Further, please refer to Figure 1In some embodiments, the protrusion 113 protrudes by an dimension A relative to the body 111 along the length direction of the battery 10, and the thickness of the body 111 is C, where 200μm ≤ A + C ≤ 400μm. Specifically, A + C can be 200μm, 210μm, 215μm, 220μm, 225μm, 230μm, 235μm, 240μm, 245μm, 250μm, 255μm, 260μm, 265μm, 270μm, 275μm, 280μm, 285μm, 290μm, 300μm, 310μm, 320μm, 330μm, 340μm, 350μm, 360μm, 370μm, 380μm, 390μm, or 400μm. When A+C is greater than 400 μm, this results in a lower energy density for battery 10. When A+C is less than 200 μm, this results in lower welding strength between the middle frame 110 and the cover plate 120, making battery 10 prone to cracking and failure. In some other embodiments, 225 μm ≤ A+C ≤ 300 μm.

[0088] Further, please refer to Figure 1 In some embodiments, the thickness of the cover plate 120 is M, where 25μm ≤ M ≤ 250μm. Specifically, M can be 25μm, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, 120μm, 140μm, 160μm, 180μm, 200μm, 210μm, 220μm, 230μm, 240μm, or 250μm. When M is greater than 250μm, the excess thickness of the cover plate 120, while meeting strength requirements, will increase the weight of the cover plate 120 and also increase the size of the battery 10, thus reducing the energy density of the battery 10. In other embodiments, 50μm ≤ M ≤ 100μm.

[0089] Furthermore, in some embodiments, the cover plate 120 and the middle frame 110 are welded. Specifically, after the cover plate 120 and the middle frame 110 are welded, the weld has the characteristics of a high-strength connection, which can ensure a stable connection between the cover plate 120 and the middle frame 110, thereby improving the overall strength of the housing 100. In addition, the weld also has the characteristics of good sealing performance. After the cover plate 120 and the middle frame 110 are welded, the battery 10 can be well sealed, thereby improving the reliability of the battery 10.

[0090] Furthermore, in some embodiments, the battery cell 200 and the housing 100 are electrically connected. Specifically, the electrical connection between the battery cell 200 and the housing 100 means that the battery cell 200 includes a positive tab and a negative tab, and the negative tab of the battery cell 200 is welded to the housing 100, thereby achieving the electrical connection between the battery cell 200 and the housing 100. Alternatively, the positive tab of the battery cell 200 is welded to the housing 100, thereby achieving the electrical connection between the battery cell 200 and the housing 100. After the housing 100 and the battery cell 200 are electrically connected, the housing 100 can carry either a positive or negative charge, which facilitates the use of the battery 10.

[0091] In some embodiments, the electrical device includes the battery 10 of any of the above embodiments. Specifically, the battery 10 not only has a high energy density but also effectively prevents damage to the battery cell 200. Furthermore, the electrical device with this battery 10 has better safety and battery life.

[0092] 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 includes a middle frame and a cover plate. The middle frame includes a body and a protrusion. The body is arranged around to form a receiving space. The protrusion is connected to one end of the body and faces the interior of the receiving space and protrudes relative to the body. The cover plate is connected to the protrusion and the body to close the receiving space. The battery cell is disposed in the receiving space; Wherein, along the width direction of the battery, the protrusion of the protrusion relative to the body is A, the thickness of the body is C, and 1≤A / C≤3.

2. The battery according to claim 1, characterized in that, The protrusion has an arc-shaped portion at the end away from the body, and the arc-shaped portion is positioned towards the battery cell.

3. The battery according to claim 1, characterized in that, Along the width direction of the battery, the distance from the widest point of the cell to the body is D, where 75μm≤A≤0.9D.

4. The battery according to claim 1, characterized in that, Along the thickness direction of the battery, the size of the protrusion is B, where 50μm≤B≤200μm.

5. The battery according to claim 1, characterized in that, 50μm≤C≤150μm; and / or, 200μm≤A+C≤400μm.

6. The battery according to claim 1, characterized in that, The thickness of the cover plate is M, where 25μm≤M≤250μm.

7. The battery according to claim 1, characterized in that, The battery satisfies at least one of the following conditions (1) to (3): (1) 100μm≤A≤250μm; (2) 225μm≤A+C≤300μm; (3) The thickness of the cover plate is M, 50μm≤M≤100μm.

8. The battery according to claim 1, characterized in that, The cover plate and the middle frame are welded together.

9. The battery according to claim 1, characterized in that, The battery cell and the housing are electrically connected.

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

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