Battery

Abstract

The utility model discloses a battery, which comprises a first shell, a second shell and a battery pack, the second shell comprises a body part, a bonding part and a protruding part, one side of the bonding part is bonded to the body part in a surrounding mode, the other side of the bonding part is bonded to the protruding part in a surrounding mode, the protruding part protrudes relative to the body part, the protruding part is arranged in the storage cavity, and the bonding part is arranged in the storage cavity. The protruding part is connected to the cavity wall of the storage cavity, and the body part covers an opening of the storage cavity in a sealing mode. The battery provided by the utility model can have relatively high safety.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially is related to a battery. BACKGROUND

[0002] In the related art, the battery comprises a cover plate, a shell and a battery cell. The shell is usually made of metal. After the battery cell is loaded into the shell, the shell is welded to the cover plate to complete the packaging of the battery cell. During use, when the battery is overcharged or the temperature of the external environment of the battery is high, a large amount of gas is generated in the battery, and the pressure in the battery can be high, which can cause the battery to explode. Therefore, the safety of the battery is low. SUMMARY

[0003] The utility model aims at solving one of the technical problems in the prior art. To this end, the utility model provides a battery which can have high safety.

[0004] The battery according to the embodiments of the utility model comprises:

[0005] The first shell has a storage cavity.

[0006] The second shell comprises a body portion, an adhesive portion and a protruding portion. One side of the adhesive portion is adhered around the body portion, and the other side of the adhesive portion is adhered around the protruding portion. The protruding portion protrudes relative to the body portion. The protruding portion is arranged in the storage cavity, and the protruding portion is connected to the cavity wall of the storage cavity. The body portion covers the opening of the storage cavity.

[0007] The battery according to the embodiments of the utility model has at least the following beneficial effects: one side of the adhesive portion is adhered around the body portion, and the other side of the adhesive portion is adhered around the protruding portion. The battery cell can be placed in the storage cavity. When the pressure inside the storage cavity is high, the temperature inside the storage cavity is high, which can cause the adhesive effect of the adhesive portion to fail. The gas inside the storage cavity can escape between the body portion and the protruding portion to release pressure, which can effectively prevent the battery from exploding. In this way, the battery can have high safety.

[0008] According to some embodiments of the utility model, the melting point of the adhesive portion is T, and 90℃≤T≤125℃.

[0009] According to some embodiments of the utility model, the protruding portion is welded to the cavity wall of the storage cavity.

[0010] According to some embodiments of the utility model, the body portion is provided with a first groove, and the adhesive portion is arranged in the first groove.

[0011] According to some embodiments of the battery of the utility model, the convex part is provided with a second groove, and the bonding part is arranged in the second groove.

[0012] According to some embodiments of the battery of the utility model, along the length direction of the body part, the size of the second groove is C, and 0.05mm≤C≤0.1mm.

[0013] According to some embodiments of the battery of the utility model, the depth of the second groove is D, and 0.05mm≤D≤0.1mm.

[0014] According to some embodiments of the battery of the utility model, the battery further includes an electric core, the electric core is arranged in the storage cavity, the electric core includes a first tab and a second tab, the first tab is electrically connected with the body part, and the second tab is electrically connected with the convex part.

[0015] According to some embodiments of the battery of the utility model, along the length direction of the body part, the size of the convex part is A, and 0.1mm≤A≤0.2mm, or along the thickness direction of the body part, the size of the convex part is B, and 0.5mm≤B≤2mm.

[0016] According to some embodiments of the battery of the utility model, along the length direction of the body part, the closest distance between the convex part and the edge of the body part is L, and 0.05mm≤L≤0.15mm.

[0017] Additional aspects and advantages of the utility model will be in part apparent and in part pointed out hereinafter in the description. BRIEF DESCRIPTION OF DRAWINGS

[0018] The utility model will be further explained in combination with the drawings and embodiments, wherein:

[0019] Figure 1 It is the schematic diagram of the battery of some embodiments of the utility model;

[0020] Figure 2 It is the cross section schematic view of the battery of the first embodiment of the utility model;

[0021] Figure 3 It is the cross section schematic view of the second shell in the battery of the first embodiment of the utility model;

[0022] Figure 4 It is the cross section schematic view of the second shell in the battery of the second embodiment of the utility model;

[0023] Figure 5 It is the cross section schematic view of the battery of the second embodiment of the utility model.

[0024] Reference signs:

[0025] Battery 10, first shell 100, storage cavity 110, second shell 200, body part 210, first recess 211, bonding part 220, protruding part 230, second recess 231, electric core 300, first tab 310, second tab 320. DETAILED DESCRIPTION

[0026] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are used only for explaining the present application, and cannot be understood as a limitation of the present application.

[0027] In the description of the present application, it is understood that, in relation to the orientation description, for example, the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation of the present application.

[0028] In the description of the present application, the meaning of several is more than one, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0029] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0030] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0031] The battery can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited thereto.

[0032] The battery generally includes a cell. The cell includes a positive electrode, a negative electrode, and a separator. During the charging and discharging of the battery, active ions (e.g., lithium ions) are inserted and extracted between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, and can prevent the positive and negative electrodes from shorting while allowing the active ions to pass through.

[0033] In some embodiments, the positive electrode can be a positive electrode sheet, which can include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0034] As an example, the positive electrode current collector has two opposite surfaces in the thickness direction thereof, and the positive electrode active material is disposed on either one or both of the two opposite surfaces of the positive electrode current collector.

[0035] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, aluminum with silver plating on the surface, stainless steel with silver plating on the surface, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. can be used. The composite current collector can include a high polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a high polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0036] As an example, the positive electrode active material can include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries can also be used. These positive electrode active materials can be used alone or in combination with two or more. Among them, examples of lithium-containing phosphates can include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP for short)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite material of lithium manganese iron phosphate and carbon. Examples of lithium transition metal oxides can include, but are not limited to, at least one of 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, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3O2(also can be referred to as NCM333), LiNi 0.5 Co 0.2 Mn 0.3 O2(also can be referred to as NCM523), LiNi 0.5 Co 0.25 Mn 0.25 O2(also can be referred to as NCM211), LiNi 0.6 Co 0.2 Mn 0.2 O2(also can be referred to as NCM622), LiNi 0.8 Co 0.1 Mn 0.1 O2(also can be referred to as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and modified compounds thereof.

[0037] In some embodiments, the positive electrode can employ a foam metal. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, or the like. When the foam metal is used as the positive electrode, the foam metal surface can not be provided with a positive electrode active material, or of course can be provided with a positive electrode active material. As an example, the foam metal can also be filled or / and deposited with a lithium source material, a potassium metal or a sodium metal, the lithium source material being a lithium metal and / or a lithium-rich material.

[0038] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0039] As an example, the negative electrode current collector can employ a metal foil, a foam metal or a composite current collector. For example, as the metal foil, silver surface treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, nickel or titanium, or the like can be employed. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, or the like. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, or the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0040] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material provided on at least one surface of the negative electrode current collector.

[0041] As an example, the negative electrode current collector has two surfaces opposite in its own thickness direction, and the negative electrode active material is provided on either one or both of the two opposite surfaces of the negative electrode current collector.

[0042] As an example, the negative active material can employ a negative active material for a battery that is publicly known in the art. As an example, the negative active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a negative active material for a battery can also be used. These negative active materials can be used alone or in combination of two or more.

[0043] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0044] In some embodiments, the battery further includes a separator disposed between the positive electrode and the negative electrode.

[0045] In some embodiments, the separator is a separator film. The separator film can be of various types, and any publicly known porous structure separator film having good chemical stability and mechanical stability can be used.

[0046] As an example, the material of the separator film can include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator film can be a single layer film or a multi-layer composite film. When the separator film is a multi-layer composite film, the materials of the respective layers can be the same or different. The separator can be a separate component located between the positive and negative electrodes, or can be attached to the surface of the positive and negative electrodes.

[0047] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive electrode and the negative electrode, and functions to transport ions and separate the positive and negative electrodes.

[0048] In some embodiments, the battery further includes an electrolyte that functions to conduct ions between the positive and negative electrodes. The electrolyte can be in a liquid state, a gel state, or a solid state. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0049] In some embodiments, the electrolyte salt can include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonylimide, lithium bis-trifluoromethanesulfonylimide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoroboric oxalate, lithium boric oxalate, lithium difluoroboric dioxalate, and lithium tetrafluorophosphoric oxalate.

[0050] In some embodiments, the solvent can include at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, butyl sulfone, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be selected from ether solvents. The ether solvents can include one or more of 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 ether.

[0051] In some embodiments, the gel electrolyte includes a polymer as a skeleton network of the electrolyte, and an ionic liquid-lithium salt.

[0052] In some embodiments, the solid electrolyte includes a polymer solid electrolyte, an inorganic solid electrolyte, and a composite solid electrolyte.

[0053] As an example, the polymer solid electrolyte can be a polyether (polyethylene oxide), a polysiloxane, a polycarbonate, a polyacrylonitrile, a polyvinylidene fluoride, a polymethyl methacrylate, a single-ion polymer, a polyionic liquid-lithium salt, cellulose, or the like.

[0054] As an example, the inorganic solid electrolyte can include one or more of an oxide solid electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorus sulfide, argyrodite), amorphous sulfide), and a halide solid electrolyte, a nitride solid electrolyte, and a hydride solid electrolyte.

[0055] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0056] In some embodiments, the battery cell has a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound to form the jelly-roll structure.

[0057] In some embodiments, the battery cell has a stacked structure.

[0058] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided, and the plurality of positive electrode sheets and the plurality of negative electrode sheets can be alternately stacked.

[0059] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked.

[0060] As an example, the positive electrode sheet and the negative electrode sheet can be folded to form a plurality of folded segments that are stacked.

[0061] As an example, the separators can be provided in plurality, each provided between any adjacent positive electrode sheet or negative electrode sheet.

[0062] As an example, the separators can be provided in plurality, each provided between any adjacent positive electrode sheet or negative electrode sheet.

[0063] In some embodiments, the shape of the battery cell can be cylindrical, flat, or polygonal, etc.

[0064] In some embodiments, the battery cell can be provided with tabs, which can conduct current out of the battery cell. The tabs can include positive tabs and negative tabs.

[0065] In some embodiments, the battery can include a housing. The housing can be used to enclose the battery cell and other components such as electrolyte. The housing can be a steel case, an aluminum case, a plastic case (e.g., polypropylene), a composite metal case (e.g., copper-aluminum composite case), or an aluminum-plastic film, etc.

[0066] As an example, the battery can be a cylindrical battery, a prismatic battery, a pouch battery, or other shapes of batteries, which can include but are not limited to a square battery, a blade battery, a polygonal battery, such as a hexagonal battery, etc.

[0067] The battery as referred to in the embodiments of the present application can mean a single physical module including one or more batteries to provide higher voltage and capacity.

[0068] In some embodiments, the battery can be a battery module, and when there are multiple batteries, the multiple batteries can be arranged and fixed to form a battery module.

[0069] In some embodiments, the battery can be a battery pack, which can include a box and batteries, and the batteries or battery modules can be contained in the box.

[0070] In some embodiments, the box can be part of the chassis structure of a vehicle. For example, part of the box can be at least part of the floor of the vehicle, or part of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0071] The embodiments of the present application provide a power consuming device using a battery as a power source. The power consuming device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. The electric toy can include a stationary or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0072] In the related art, a battery includes a cover plate, a shell and a battery cell. The shell is usually made of metal material. After the battery cell is loaded into the shell, the cover plate is welded on the shell to complete the packaging of the battery cell. During use of the battery, when the battery is overcharged or the temperature of the external environment of the battery is high, more gas is generated in the battery, and the pressure in the battery can be high, which can cause the battery to explode. Therefore, the safety of the battery is low. To this end, the application provides a battery.

[0073] Please refer to Figures 1 to 5 In some embodiments, the battery 10 includes a battery cell 300, a first shell 100 and a second shell 200. The battery cell 300 can be formed by stacking and winding positive and negative electrode sheets, or by alternately stacking positive and negative electrode sheets. The first shell 100 has a storage cavity 110. The shape of the first shell 100 can be a cube, a cuboid or a cylinder, and the shape of the storage cavity 110 can be a cube, a cuboid or a cylinder. The material of the first shell 100 can be metal material, such as copper, aluminum or stainless steel. Please refer to Figures 2 to 4 The second shell 200 includes a body part 210, an adhesive part 220 and a protruding part 230. One side of the adhesive part 220 is surrounded and adhered to the body part 210, and the other side of the adhesive part 220 is surrounded and adhered to the protruding part 230. The protruding part 230 protrudes relative to the body part 210. The protruding part 230 can be in the shape of a ring, and the body part 210 can be in the shape of a sheet, and the protruding part 230 and the body part 210 are connected by the adhesive part 220. The protruding part 230 is arranged in the storage cavity 110, and the protruding part 230 is connected to the cavity wall of the storage cavity 110, and the body part 210 covers the opening of the storage cavity 110. Specifically, one side of the adhesive part 220 is surrounded and adhered to the body part 210, and the other side of the adhesive part 220 is surrounded and adhered to the protruding part 230. The battery cell 300 can be placed in the storage cavity 110. When the pressure inside the storage cavity 110 is high, the temperature inside the storage cavity 110 is high, which can cause the adhesive effect of the adhesive part 220 to fail, and the gas inside the storage cavity 110 can escape between the body part 210 and the protruding part 230 to release pressure, thereby effectively preventing the battery 10 from exploding. In this way, the battery 10 can have high safety. In addition, it is further explained that the connection of the first shell 100 and the second shell 200 is mainly achieved by the connection of the protruding part 230 and the cavity wall of the storage cavity 110. In the prior art, a flange is arranged on the shell, and the cover plate is welded on the flange, which can cause the energy density of the battery 10 to be low. However, in the present application, the first shell 100 and the second shell 200 do not have a flange, so the energy density of the battery 10 can be improved.

[0074] Further, the adhesive portion 220 is described below. The adhesive portion 220 can be EVA hot melt adhesive, polyamide hot melt adhesive, polyester hot melt adhesive, etc., wherein these adhesives are sticky after cooling. When connecting the body portion 210 and the protruding portion 230, the adhesive portion 220 is placed between the two, and then heated until cooled to achieve the connection of the body portion 210 and the protruding portion 230. When the battery 10 is out of control, the temperature inside the battery 10 rises, which will cause the adhesive portion 220 to lose its stickiness, and the connection of the body portion 210 and the protruding portion 230 will be unstable, and the gas can easily break through the connection of the adhesive portion 220 and the body portion 210 or the connection of the adhesive portion 220 and the protruding portion 230, thereby releasing pressure. In addition, after the body portion 210 and the protruding portion 230 are connected by the adhesive portion 220, when the body portion 210 and the protruding portion 230 are respectively electrified, the adhesive portion 220 can also have an insulating effect, effectively avoiding the short circuit of the battery 10.

[0075] Further, in some embodiments, the melting point of the adhesive portion 220 is T, 90℃≤T≤125℃. Specifically, the melting point of the adhesive portion 220 can be 90℃, 95℃, 100℃, 120℃, or 125℃. Among them, when the melting point of the adhesive portion 220 is less than 90℃, due to the low melting point of the adhesive portion 220, it can cause the body portion 210 and the protruding portion 230 to crack before the battery 10 is out of control, reducing the airtightness of the battery 10. When the melting point of the adhesive portion 220 is greater than 125℃, since the adhesive portion 220 needs a higher temperature to melt, therefore, the battery 10 cannot release pressure at the first time of thermal runaway, and the battery 10 will have a greater safety hazard.

[0076] Further, the protruding part 230 is arranged in the storage cavity 110, and the protruding part 230 is connected to the cavity wall of the storage cavity 110 in various manners. For example, the protruding part 230 is welded to the cavity wall of the storage cavity 110, or the protruding part 230 is adhered to the cavity wall of the storage cavity 110, or the protruding part 230 is clamped to the cavity wall of the storage cavity 110. In some embodiments, the protruding part 230 is welded to the cavity wall of the storage cavity 110. Specifically, by welding the protruding part 230 to the cavity wall of the storage cavity 110, the connection stability of the first shell 100 and the second shell 200 is high, thereby improving the reliability of the battery 10. In addition, the specific process of welding the protruding part 230 to the cavity wall of the storage cavity 110 can be that the protruding part 230 is inserted into the storage cavity 110, the protruding part 230 can abut on the cavity wall of the storage cavity 110, and the protruding part 230 and the cavity wall of the storage cavity 110 are welded by welding the outer surface of the first shell 100 by a laser device. This can facilitate processing and manufacturing, and improve manufacturing efficiency. After the protruding part 230 and the first shell 100 are welded, the protruding part 230 can be electrically connected to the battery cell 300, so that the first shell 100 is electrified.

[0077] Further, please refer to Figure 3 In some embodiments, the body part 210 is provided with a first groove 211, and the adhesive part 220 is arranged in the first groove 211. Specifically, by arranging the first groove 211, the first groove 211 can accommodate more adhesive parts 220, which can improve the adhesion effect and improve the air tightness of the battery 10. The number of the first grooves 211 is not limited, for example, the number of the first grooves 211 can be two, three or four.

[0078] Further, in addition to arranging the first groove 211 on the body part 210, a second groove 231 can also be arranged on the protruding part 230. Specifically, please refer to Figure 3 In some embodiments, the protruding part 230 is provided with a second groove 231, and the adhesive part 220 is arranged in the second groove 231. Specifically, by arranging the second groove 231, the second groove 231 can accommodate more adhesive parts 220, which can improve the adhesion effect and improve the air tightness of the battery 10. The number of the second grooves 231 is not limited, for example, the number of the second grooves 231 can be two, three or four.

[0079] Further, please refer to Figure 3In some embodiments, the size of the second groove 231 along the length direction of the body portion 210 is C, and 0.05mm≤C≤0.1mm. Specifically, the size of the second groove 231 along the length direction of the body portion 210 can be the width of the second groove 231, and specifically can be 0.05mm, 0.08mm or 0.1mm. When the width of the second groove 231 is less than 0.05mm, the size of the second groove 231 is limited, which can result in a small volume of the adhesive portion 220 that can be accommodated, and a poor bonding effect. When the width of the second groove 231 is greater than 0.1mm, the width of the second groove 231 is large, which can result in an excessive amount of the adhesive portion 220 and cause material waste and an increase in the manufacturing cost of the battery 10. In addition, the size of the first groove 211 along the length direction of the body portion 210 can be the same as the size of the second groove 231.

[0080] Further, please refer to Figure 3 In some embodiments, the depth of the second groove 231 is D, and 0.05mm≤D≤0.1mm. Specifically, the depth of the second groove 231 can be 0.05mm, 0.08mm or 0.1mm. When the depth of the second groove 231 is less than 0.05mm, the size of the second groove 231 is limited, which can result in a small volume of the adhesive portion 220 that can be accommodated, and a poor bonding effect. When the depth of the second groove 231 is greater than 0.1mm, the depth of the second groove 231 is large, which can result in an excessive amount of the adhesive portion 220 and cause material waste and an increase in the manufacturing cost of the battery 10. In addition, the size of the first groove 211 along the length direction of the body portion 210 can be the same as the size of the second groove 231.

[0081] Further, please refer to Figure 5In some embodiments, the battery 10 further comprises an electric core 300. The electric core 300 is arranged in the storage cavity 110, and the electric core 300 comprises a first tab 310 and a second tab 320. The first tab 310 can be a positive tab, i.e., the first tab 310 is electrically connected with the positive plate. The first tab 310 can be a negative tab, i.e., the first tab 310 is electrically connected with the negative plate. The second tab 320 can be a positive tab, i.e., the second tab 320 is electrically connected with the positive plate. The second tab 320 can be a negative tab, i.e., the second tab 320 is electrically connected with the negative plate. The first tab 310 is electrically connected with the body portion 210, and the second tab 320 is electrically connected with the protruding portion 230. Specifically, the first tab 310 can be welded with the body portion 210. After the first tab 310 is welded with the body portion 210, the second shell 200 of the battery 10 can be charged. After the second tab 320 is welded with the protruding portion 230, the protruding portion 230 can be welded with the first shell 100, so that the first shell 100 of the battery 10 can be charged. For example, the first shell 100 can be negatively charged, and the body portion 210 can be positively charged. The insulation between the first shell 100 and the body portion 210 is achieved by the adhesive portion 220, which can effectively avoid short circuit of the battery 10. In addition, it should be noted that, in order to ensure the insulation between the body portion 210 and the first shell 100, the surface of the protruding portion 230 away from the electric core 300 can be flush with or higher than the opening edge of the first shell 100, and the adhesive portion 220 is arranged between the protruding portion 230 and the opening edge of the first shell 100.

[0082] Further, please refer to Figure 3In some embodiments, the protrusion 230 has a dimension A along the length direction of the body portion 210, and 0.1 mm≤A≤0.2 mm. Specifically, the protrusion 230 can be annular, and the protrusion 230 has a wall thickness of A, which can be specifically 0.1 mm, 0.15 mm, 0.18 mm, or 0.2 mm. When the dimension of the protrusion 230 along the length direction of the body portion 210 is less than 0.1 mm, the dimension of the protrusion 230 is small, which can be inconvenient for welding the cavity wall of the storage cavity 110. When the dimension of the protrusion 230 along the length direction of the body portion 210 is greater than 0.2 mm, the dimension of the protrusion 230 is large, which can cause the protrusion 230 to occupy too much space of the storage cavity 110, resulting in a reduction in the volume of the battery cell 300 and a low energy density of the battery 10. Alternatively, in some embodiments, the protrusion 230 has a dimension B along the thickness direction of the body portion 210, and 0.5 mm≤B≤2 mm. The dimension B can be specifically 0.5 mm, 0.6 mm, 1 mm, or 2 mm. When the dimension of the protrusion 230 along the thickness direction of the body portion 210 is less than 0.5 mm, the dimension of the protrusion 230 is small, which can be inconvenient for welding the cavity wall of the storage cavity 110. When the dimension of the protrusion 230 along the thickness direction of the body portion 210 is greater than 2 mm, the dimension of the protrusion 230 is large, which can cause the protrusion 230 to occupy too much space of the storage cavity 110, resulting in a reduction in the volume of the battery cell 300 and a low energy density of the battery 10.

[0083] Further, after the protrusion 230 is connected to the body portion 210 by the adhesive portion 220, the edge of the protrusion 230 can be aligned with the edge of the body portion 210, or the edge of the protrusion 230 can be offset from the edge of the body portion 210. Wherein, please refer to Figure 3 In some embodiments, the closest distance between the edge of the protrusion 230 and the edge of the body portion 210 along the length direction of the body portion 210 is L, and 0.05 mm≤L≤0.15 mm. Specifically, L can be specifically 0.05 mm, 0.08 mm, 0.1 mm, or 0.15 mm. When the closest distance between the edge of the protrusion 230 and the edge of the body portion 210 is less than 0.05 mm, it can result in a high processing difficulty, causing an increase in manufacturing cost. When the closest distance between the edge of the protrusion 230 and the edge of the body portion 210 is greater than 0.15 mm, it can result in a large size of the body portion 210, causing a waste of material. In addition, if the closest distance between the edge of the protrusion 230 and the edge of the body portion 210 is too large, it can also cause the body portion 210 to exceed the surface of the first shell 100, resulting in a reduction in the energy density of the battery 10.

[0084] The utility model embodiment has been explained in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiment, still can make various changes in the knowledge range of the ordinary skill in the art who possesses under the premise of not departing from the utility model's tenet. Besides, the embodiment and the feature in the embodiment of the utility model can be combined mutually under the condition of not conflicting.

Claims

1. A battery, characterized by, The battery comprises: a first shell having a storage cavity; a second shell comprising a body portion, an adhesive portion and a protruding portion, one side of the adhesive portion being adhered to the body portion, the other side of the adhesive portion being adhered to the protruding portion, the protruding portion being protruded relative to the body portion, wherein the protruding portion is arranged in the storage cavity and connected to the cavity wall of the storage cavity, and the body portion covers the opening of the storage cavity.

2. The battery of claim 1, wherein, The adhesive portion has a melting point T, and 90℃≤T≤125℃.

3. The battery of claim 1, wherein, The protruding portion is welded to the cavity wall of the storage cavity.

4. The battery of claim 1, wherein, The body portion is provided with a first groove, and the adhesive portion is arranged in the first groove.

5. The battery of claim 1, wherein, The protruding portion is provided with a second groove, and the adhesive portion is arranged in the second groove.

6. The battery of claim 5, wherein, In the length direction of the body portion, the size of the second groove is C, and 0.05mm≤C≤0.1mm.

7. The battery of claim 5, wherein, The depth of the second groove is D, and 0.05mm≤D≤0.1mm.

8. The battery of claim 1, wherein, The battery further comprises an electric core arranged in the storage cavity, the electric core comprising a first tab and a second tab, the first tab being electrically connected to the body portion, and the second tab being electrically connected to the protruding portion.

9. The battery of claim 1, wherein, In the length direction of the body portion, the size of the protruding portion is A, and 0.1mm≤A≤0.2mm; or, in the thickness direction of the body portion, the size of the protruding portion is B, and 0.5mm≤B≤2mm.

10. The battery of claim 1, wherein, In the length direction of the body portion, the closest distance between the protruding portion and the edge of the body portion is L, and 0.05mm≤L≤0.15mm.

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