Battery

Abstract

The utility model discloses a battery, which comprises a battery cell, a battery cover and a battery cover, the battery cell comprises a main body and an adhesive layer, the adhesive layer is connected to the main body, and the adhesive layer protrudes relative to the main body; the shell comprises a sealing part, a storage part and a cover body part, the sealing part is connected to the storage part and the cover body part, the cover body part is connected to the storage part, the cover body part and the storage part jointly define a storage cavity, the battery cell is arranged in the storage cavity, a first groove is formed in the cavity wall of the storage cavity, and a second groove is formed in the cavity wall of the storage cavity. The groove wall of the first groove is provided with a second groove, the main body is arranged in the first groove, and the adhesive layer is arranged in the second groove. The battery provided by the utility model can have relatively high energy density.

Description

Technical Field

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

[0002] In related technologies, a battery comprises a casing and a battery cell. The casing has a storage cavity in which the battery cell is housed. The casing primarily serves to protect and encapsulate the battery cell. It prevents external physical damage to the battery cell, such as impacts and compression, and also prevents leakage of internal chemicals. Casings are typically of two types: aluminum-plastic film and metal casing.

[0003] After the aluminum-plastic film is stamped to form the storage cavity, the battery cell can be placed inside the storage cavity. Adhesive tape is applied to the battery cell, which increases its thickness. When the battery cell is placed inside the aluminum-plastic film, this results in a thicker battery and a lower energy density. Utility Model Content

[0004] 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 capable of having a high energy density.

[0005] The battery according to an embodiment of the present invention includes:

[0006] A battery cell includes a body and an adhesive layer, the adhesive layer being attached to the body and protruding relative to the body;

[0007] The housing includes a sealing part, a storage part, and a cover part. The sealing part is connected to the storage part and the cover part, and the cover part is connected to the storage part. The cover part and the storage part together define a storage cavity. The battery cell is disposed in the storage cavity. The cavity wall of the storage cavity is provided with a first groove, and the groove wall of the first groove is provided with a second groove. The main body is disposed in the first groove, and the adhesive layer is disposed in the second groove.

[0008] The battery according to the embodiments of this utility model has at least the following beneficial effects: The battery cell includes a main body and an adhesive layer, and the battery cell is disposed in a storage cavity. After the battery cell is disposed in the storage cavity, the main body can be located in a first groove, and the adhesive layer can be located in a second groove. In the prior art, the storage cavity wall of the casing does not have a first groove and a second groove. Therefore, when the adhesive layer protrudes relative to the main body, it leads to an excessively large battery cell volume and low energy density. In this application, the storage cavity wall has a first groove and a second groove, with the main body located in the first groove and the adhesive layer located in the second groove. This allows the storage cavity to accommodate more battery cells without changing the original size of the casing, thereby increasing the battery's energy density. Specifically, the battery can have a high energy density.

[0009] According to some embodiments of the present invention, the battery storage cavity includes two first walls, two second walls, and two third walls arranged opposite to each other. The two ends of the second wall are respectively connected to the two third walls. The two second walls and the two third walls surround and connect to the first wall. The area of ​​the first wall is larger than the area of ​​the second wall and the area of ​​the third wall. Along the thickness direction of the battery cell, the two first walls are respectively disposed on both sides of the battery cell. The first wall is provided with a first groove and a second groove.

[0010] According to some embodiments of the present invention, the battery has two of each of the first and second grooves, one of which is disposed on one first wall, and the other of which is disposed on another first wall.

[0011] According to some embodiments of the present invention, the second wall of the battery is provided with the first groove and the second groove.

[0012] According to some embodiments of the present invention, the battery has the first groove and the second groove provided on both the second wall and the third wall.

[0013] According to some embodiments of the present invention, the battery storage cavity wall includes an outer layer, a metal layer and a heat-sealing layer stacked sequentially, wherein the heat-sealing layer is provided with a first groove and a second groove.

[0014] According to some embodiments of the present invention, the battery of the storage cavity includes an outer layer, a metal layer and a heat-sealing layer stacked sequentially, wherein the heat-sealing layer and the metal layer together form the first groove, and the metal layer is provided with the second groove.

[0015] According to some embodiments of the present invention, the battery cell further includes a tab, the main body includes a first end and a second end opposite to each other, the tab is connected to the first end, the first groove includes a first half groove and a second half groove, the groove depth of the first half groove is greater than the groove depth of the second half groove, the first end is disposed in the first half groove, and the second end is disposed in the second half groove.

[0016] According to some embodiments of the present invention, the thickness of the adhesive layer is L1, and the depth of the second groove is L2, where L1 ≤ L2.

[0017] According to some embodiments of the present invention, the depth of the first groove in the battery is L3, where 10μm≤L3≤50μm.

[0018] According to some embodiments of the present invention, the coefficient of friction of the groove wall of the first groove is Y, where 0.3 < Y < 2.5.

[0019] According to some embodiments of the present invention, the battery has a chamfered portion between the groove wall of the first groove and the cavity wall of the storage cavity.

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

[0024] Figure 3 This is a schematic diagram of the battery casing in some embodiments of the present invention;

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

[0026] Figure 5 This is a schematic diagram of the battery according to the fourth embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the battery according to the fifth embodiment of the present invention.

[0028] Figure label:

[0029] Battery 10, cell 100, main body 110, adhesive layer 120, shell 200, sealing part 210, storage part 220, cover part 230, storage cavity 240, first wall 241, second wall 242, third wall 243, first groove 250, chamfer part 251, second groove 260, outer layer 300, metal layer 400, heat sealing layer 500. Detailed Implementation

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.).

[0040] 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 Al0.05 At least one of O2 and its modified compounds.

[0041] 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.

[0042] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0043] 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.).

[0044] 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.

[0045] 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.

[0046] 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.

[0047] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0048] In some implementations, the battery cell also includes an isolation element disposed between the positive and negative terminals.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0056] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0057] 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.

[0058] 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.

[0059] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0060] In some implementations, the battery cell has a wound structure. The positive and negative electrode plates are wound into a wound structure.

[0061] In some implementations, the battery cell has a laminated structure.

[0062] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0063] 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.

[0064] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0065] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0066] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0067] In some implementations, the battery cell can be cylindrical, flat, or polygonal, etc.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] In related technologies, a battery comprises a casing and a battery cell. The casing has a storage cavity in which the battery cell is housed. The casing primarily serves to protect and encapsulate the battery cell. It prevents external physical damage to the battery cell, such as impacts and compression, and also prevents leakage of internal chemicals. Casings are typically of two types: aluminum-plastic film and metal casing.

[0077] After the aluminum-plastic film is stamped to form a storage cavity, the battery cell can be placed inside the storage cavity. Adhesive tape is applied to the battery cell, which increases its thickness. When the battery cell is placed inside the aluminum-plastic film, this results in a thicker battery and a lower energy density. Therefore, this application proposes a battery design.

[0078] Please refer to Figures 1 to 6In some embodiments, the battery 10 includes a cell 100 and a casing 200. The cell 100 includes a body 110 and an adhesive layer 120. The body 110 includes a positive electrode, a separator, and a negative electrode. The body 110 can be formed by stacking the positive electrode, separator, and negative electrode, or by stacking and winding the positive electrode, separator, and negative electrode. The adhesive layer 120 is connected to the body 110 and protrudes relative to the body 110. The adhesive layer 120 can be adhesive tape, and there can be multiple adhesive tapes. Some adhesive tapes can fix the cell 100 and the casing 200, and some adhesive tapes can fix the electrode, thereby effectively preventing the electrode from loosening. The dimensions of the adhesive tape can be a width of 5mm to 30mm, a length of 10mm to 100mm, and a thickness of 5μm to 50μm. The adhesive tape can also be 5mm to 15mm wide, 10mm to 14mm long, and 5μm to 50μm thick. The protrusion of the adhesive layer 120 relative to the main body 110 can be 5μm to 10μm. The housing 200 includes a sealing portion 210, a storage portion 220, and a cover portion 230. The housing 200 can be an aluminum-plastic film. The sealing portion 210 is connected to the storage portion 220 and the cover portion 230, and the cover portion 230 is connected to the storage portion 220. The cover portion 230 and the storage portion 220 together define a storage cavity 240. That is, the aluminum-plastic film can be perforated to form a storage cavity 240 (the storage part 220 has a storage cavity 240 with an opening), and then the aluminum-plastic film is heat-sealed to encapsulate the battery cell 100 (the cover part 230 connects to the storage part 220 to close the opening of the storage cavity 240, and the sealing part 210 connects the storage part 220 and the cover part 230). The battery cell 100 is disposed in the storage cavity 240, the cavity wall of the storage cavity 240 is provided with a first groove 250, the groove wall of the first groove 250 is provided with a second groove 260, the main body 110 is disposed in the first groove 250, and the adhesive layer 120 is disposed in the second groove 260. Specifically, the battery cell 100 includes a body 110 and an adhesive layer 120. The battery cell 100 is disposed in the storage cavity 240. After the battery cell 100 is disposed in the storage cavity 240, the body 110 can be located in the first groove 250, and the adhesive layer 120 can be located in the second groove 260. In the prior art, the first groove 250 and the second groove 260 are not provided on the cavity wall of the storage cavity 240 of the housing 200. Therefore, after the adhesive layer 120 protrudes relative to the body 110, the volume of the battery cell 100 will be too large and the energy density will be low. In this application, the first groove 250 and the second groove 260 are provided on the cavity wall of the storage cavity 240. The body 110 is located in the first groove 250, and the adhesive layer 120 is located in the second groove 260. This allows the storage cavity 240 to accommodate more battery cells 100 without changing the original size of the housing 200, thereby increasing the energy density of the battery 10. Specifically, the battery 10 can have a high energy density.

[0079] Please refer to Figure 3 , Figure 3 A cross-sectional view of the housing 200 is shown. The cavity wall of the storage cavity 240 has a first groove 250 and a second groove 260. Specifically, the first groove 250 can be formed on the cavity wall of the storage cavity 240 by laser thinning, and then the second groove 260 can be formed on the groove wall of the first groove 250 by laser thinning. The area of ​​the first groove 250 is larger than the area of ​​the second groove 260. In some embodiments, in the thickness direction of the body 110, the projection of the body 110 falls on the projection of the first groove 250, and the projection of the adhesive layer 120 falls on the projection of the second groove 260. Furthermore, the length and width of the second groove 260 can both be 2 mm longer than the length and width of the adhesive layer 120.

[0080] Furthermore, the specific structure of the housing 200 is described below; please refer to [the relevant documentation]. Figures 1 to 4 In some embodiments, the cavity wall of the storage cavity 240 includes two first walls 241, two second walls 242, and two third walls 243 arranged opposite to each other. The two ends of each second wall 242 are connected to the two third walls 243, and the two second walls 242 and two third walls 243 surround and connect to the first wall 241. That is, the shape of the storage cavity 240 can be a cuboid or a cube. The two second walls 242 can be located on both sides of the width direction or on both sides of the length direction of the cell 100, and the two third walls 243 can be located on both sides of the width direction or on both sides of the length direction of the cell 100. See details for further information. Figure 5 and Figure 6 The area of ​​the first wall 241 is larger than the areas of the second wall 242 and the third wall 243. Along the thickness direction of the cell 100, the two first walls 241 are respectively disposed on both sides of the cell 100. The first wall 241 is provided with a first groove 250 and a second groove 260. The provision of the first groove 250 and the second groove 260 on the first wall 241 effectively increases the thickness of the cell 100, thereby increasing the volume of the cell 100 and improving the energy density of the battery 10.

[0081] Furthermore, there are two ways to provide the first groove 250 and the second groove 260 on the first wall 241. One way is to provide the first groove 250 and the second groove 260 only on one of the first walls 241, and the other way is to provide the first groove 250 and the second groove 260 on both of the first walls 241. The second way can significantly improve the energy density of the battery 10. Therefore, please refer to... Figure 4In some embodiments, there are two of each of the first groove 250 and the second groove 260. One first groove 250 and the second groove 260 are disposed on one first wall 241, and the other first groove 250 and the second groove 260 are disposed on another first wall 241.

[0082] Furthermore, in addition to providing the first groove 250 and the second groove 260 on the first wall 241, the first groove 250 and the second groove 260 can also be provided on the second wall 242. Specifically, please refer to... Figure 5 In some embodiments, the second wall 242 is provided with a first groove 250 and a second groove 260. The first groove 250 and the second groove 260 on the first wall 241 can increase the thickness dimension of the cell 100. The first groove 250 and the second groove 260 on the second wall 242 can increase the width or length dimension of the cell 100. Thus, the energy density of the battery 10 is higher.

[0083] Furthermore, in addition to providing the first groove 250 and the second groove 260 on the first wall 241, the first groove 250 and the second groove 260 can also be provided on both the second wall 242 and the third wall 243. For details, please refer to... Figure 5 and Figure 6 In some embodiments, both the second wall 242 and the third wall 243 are provided with a first groove 250 and a second groove 260. The first groove 250 and the second groove 260 are provided on the first wall 241, which increases the thickness dimension of the cell 100. The first groove 250 and the second groove 260 are provided on both the second wall 242 and the third wall 243, which increases the width and length dimensions of the cell 100. Thus, the energy density of the battery 10 is higher.

[0084] Further, please refer to Figure 3 In some embodiments, the cavity wall of the storage cavity 240 includes an outer layer 300, a metal layer 400, and a heat-sealing layer 500 stacked sequentially. The outer layer 300 may be a nylon layer, the metal layer 400 may be an aluminum layer, and the heat-sealing layer 500 may be a PP layer. The thickness of the heat-sealing layer 500 may be between 20 μm and 60 μm. The heat-sealing layer 500 is provided with a first groove 250 and a second groove 260. Specifically, the first groove 250 and the second groove 260 can be formed on the cavity wall of the storage cavity 240 by thinning the heat-sealing layer 500 using a laser.

[0085] Further, please refer to Figures 2 to 3In some embodiments, the cavity wall of the storage cavity 240 includes an outer layer 300, a metal layer 400, and a heat-sealing layer 500 stacked sequentially. The outer layer 300 may be a nylon layer, the metal layer 400 may be an aluminum layer, and the heat-sealing layer 500 may be a PP layer. The heat-sealing layer 500 and the metal layer 400 together form a first groove 250, and the metal layer 400 has a second groove 260. Specifically, the first groove 250 and the second groove 260 on the cavity wall of the storage cavity 240 can be formed by using a laser to penetrate the heat-sealing layer 500 and further thinning the metal layer 400, thereby forming the second groove 260 on the metal layer 400, while the metal layer 400 and the heat-sealing layer 500 together form the first groove 250.

[0086] Furthermore, in some embodiments, the battery cell 100 further includes tabs, the body 110 includes opposing first and second ends, the tabs are connected to the first end, and the first groove 250 includes a first half-groove and a second half-groove, the depth of the first half-groove being greater than the depth of the second half-groove, the first end being disposed in the first half-groove, and the second end being disposed in the second half-groove. Specifically, after the tabs are connected to the body 110, this results in the thickness of the first end being greater than the thickness of the second end. Therefore, after the battery cell 100 is placed in the storage cavity 240, the first groove 250 can be divided into two parts (the first half-groove and the second half-groove). By making the depth of the first half-groove greater than the depth of the second half-groove, the first half-groove can accommodate the thicker first end of the body 110, which can increase the energy density of the battery 10.

[0087] Furthermore, in some embodiments, the thickness of the adhesive layer 120 is L1, and the depth of the second groove 260 is L2, where L1 ≤ L2. Specifically, the second groove 260 is used to accommodate the adhesive layer 120, and the thickness of the adhesive layer 120 can be less than the depth of the second groove 260, or the thickness of the adhesive layer 120 can be equal to the depth of the second groove 260. If the thickness of the adhesive layer 120 is greater than the depth of the second groove 260, then the second groove 260 will not be able to accommodate the adhesive layer 120, resulting in wasted space between the main body 110 and the groove wall of the first groove 250, thus failing to effectively improve the energy density of the battery 10.

[0088] Furthermore, in some embodiments, the depth of the first groove 250 is L3, where 10μm ≤ L3 ≤ 50μm. Specifically, the depth of the first groove 250 can be 10μm, 20μm, 30μm, 40μm, or 5μm. When the depth of the first groove 250 is less than 10μm, the volume of the adhesive layer 120 that the first groove 250 can accommodate is limited, resulting in poor improvement in the energy density of the battery 10. When the depth of the first groove 250 is greater than 50μm, the depth of the first groove 250 is too large, which may cause the cavity wall of the storage cavity 240 to be too thin, thereby potentially reducing the safety of the battery 10.

[0089] Furthermore, in some embodiments, the coefficient of friction of the groove wall of the first groove 250 is Y, where 0.3 < Y < 2.5. Specifically, Y can be 0.4, 1, 2, 2.2, or 2.4. When the coefficient of friction of the groove wall of the first groove 250 is low, the battery cell 100 may move within the first groove 250, thus causing damage. When the coefficient of friction of the groove wall of the first groove 250 is high, although this can effectively prevent the battery cell 100 from sliding within the first groove 250, an excessively high coefficient of friction will lead to an increase in manufacturing costs while still ensuring the protection of the battery cell 100.

[0090] Further, please refer to Figure 3 In some embodiments, a chamfered portion 251 is provided between the first groove 250 and the cavity wall of the storage cavity 240. That is, the edge of the first groove 250 is chamfered to present a smooth transition. This can effectively protect the battery cell 100 and prevent the battery cell 100 from being punctured by the sharp groove.

[0091] 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 by, The application relates to a battery cell and a shell thereof. The battery cell comprises a main body and a glue layer connected to the main body, and the glue layer is protruded relative to the main body. The shell comprises a sealing part, a storage part and a cover part, the sealing part is connected to the storage part and the cover part, the cover part is connected to the storage part, the cover part and the storage part jointly define a storage cavity, the battery cell is arranged in the storage cavity, a cavity wall of the storage cavity is provided with a first groove, a groove wall of the first groove is provided with a second groove, the main body is arranged in the first groove, and the glue layer is arranged in the second groove.

2. The battery of claim 1, wherein, The cavity wall of the storage cavity comprises two oppositely arranged first walls, two oppositely arranged second walls and two oppositely arranged third walls, two ends of the second wall are respectively connected to two third walls, two second walls and two third walls are connected to the first wall, the area of the first wall is larger than the area of the second wall and the area of the third wall, and two first walls are arranged on two sides of the battery cell along the thickness direction of the battery cell.

3. The battery of claim 2, wherein, The first groove and the second groove are arranged on the first wall.

4. The battery of claim 2, wherein, The second wall is provided with the first groove and the second groove.

5. The battery of claim 2, wherein, The second wall and the third wall are provided with the first groove and the second groove.

6. The battery of claim 1, wherein, The cavity wall of the storage cavity comprises an outer layer, a metal layer and a heat-sealing layer arranged in sequence, and the heat-sealing layer is provided with the first groove and the second groove.

7. The battery of claim 1, wherein, The cavity wall of the storage cavity comprises an outer layer, a metal layer and a heat-sealing layer arranged in sequence, the heat-sealing layer and the metal layer jointly form the first groove, and the metal layer is provided with the second groove.

8. The battery of claim 1, wherein, The battery cell further comprises a tab, the main body comprises a first end and a second end, the tab is connected to the first end, the first groove comprises a first half groove and a second half groove, the groove depth of the first half groove is larger than the groove depth of the second half groove, the first end is arranged in the first half groove, and the second end is arranged in the second half groove.

9. The battery of claim 1, wherein, The thickness of the glue layer is L1, the depth of the second groove is L2, and L1<=L2.

10. The battery of claim 1, wherein, The depth of the first groove is L3, and 10mu m<=L3<=50mu m.

11. The battery of claim 1, wherein, The friction coefficient of the groove wall of the first groove is Y, and 0.3 12. The battery of claim 1, wherein, The groove wall of the first groove and the cavity wall of the storage cavity are provided with a chamfered part.

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