Battery and electric equipment

Abstract

The utility model discloses a battery and electric equipment, the battery includes: a battery cell including a main body and a foil tab, the foil tab being connected to the main body; the metal strap tab is connected to the foil tab; the shell is provided with a storage cavity, the storage cavity comprises a first cavity and a second cavity which are communicated with each other, the height of the first cavity is smaller than that of the second cavity, and the foil tab and the metal strap tab are both arranged in the second cavity. The battery provided by the utility model can have relatively high energy density.

Description

TECHNICAL FIELD

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

[0002] In the related art, the battery includes a cell and a shell. The shell is provided with a storage cavity, and the cell is arranged in the storage cavity. After the cell is arranged in the storage cavity, the cell is connected with the outside through the pole. Specifically, the cell is provided with a foil tab, and the two ends of the metal strip tab are welded with the foil tab and the pole, so that the cell is connected with the outside through the foil tab, the metal strip tab and the pole. Further, since the metal strip tab occupies a certain space in the length direction of the storage cavity, the energy density of the battery is low. SUMMARY

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

[0004] The utility model further provides an electrical equipment.

[0005] According to the battery of the first aspect of the utility model, the battery comprises:

[0006] The cell comprises a main body and a foil tab, and the foil tab is connected to the main body;

[0007] The metal strip tab is connected to the foil tab;

[0008] The shell is provided with a storage cavity, and the storage cavity comprises a first cavity and a second cavity which are in communication with each other. The height of the first cavity is less than the height of the second cavity, and the foil tab and the metal strip tab are arranged in the second cavity.

[0009] According to the battery of the utility model, the shell has a storage cavity, and the storage cavity comprises a first cavity and a second cavity. Since the height of the second cavity is greater than the height of the first cavity, the foil tab and the metal strip tab can be arranged in the second cavity, so that the metal strip tab can effectively avoid occupying a large space in the length direction of the battery, which can effectively avoid the low energy density of the battery. Specifically, the battery can have a high energy density.

[0010] According to the battery of some embodiments of the utility model, the shell comprises a shell and a cover plate, and the shell and the cover plate jointly define the storage cavity. The shell comprises a first body part and a first protruding part, and the first protruding part is connected to the first body part and protrudes relative to the first body part.

[0011] According to the battery of some embodiments of the utility model, the shell includes a shell body and a cover plate, the shell body and the cover plate jointly define the storage cavity, the cover plate includes a second body part and a second protruding part, the second protruding part is connected to the second body part and protrudes relative to the second body part.

[0012] According to the battery of some embodiments of the utility model, the battery further includes a first insulating part, the first insulating part is arranged in the second cavity, the first insulating part is provided with a receiving groove, and the metal belt tab is arranged in the receiving groove.

[0013] According to the battery of some embodiments of the utility model, the shell includes a shell body and a cover plate, the shell body and the cover plate jointly define the storage cavity, the battery further includes a first insulating part and a second insulating part, the first insulating part is connected to the shell body, the second insulating part is connected to the cover plate, the first insulating part and the second insulating part jointly define a receiving groove, and the metal belt tab is arranged in the receiving groove.

[0014] According to the battery of some embodiments of the utility model, the difference between the height of the first cavity and the height of the second cavity is L1, and L1 is greater than or equal to 1mm.

[0015] According to the battery of some embodiments of the utility model, the battery further includes a pole, the pole is insulatively connected to the shell, the pole is welded with the metal belt tab, a part of the pole is arranged in the second cavity, and another part of the pole protrudes relative to the shell along the thickness direction of the shell.

[0016] According to the battery of some embodiments of the utility model, the battery further includes a first insulating part and a third insulating part, the first insulating part is arranged in the second cavity, the first insulating part is provided with a receiving groove, the metal belt tab is arranged in the receiving groove, two ends of the third insulating part are respectively connected to the opposite two groove walls of the receiving groove, the third insulating part is provided with a through hole, and the foil tab is connected with the metal belt tab by being arranged in the through hole.

[0017] According to the battery of some embodiments of the utility model, the battery further includes a tab rubber, and the tab rubber covers the main body, the foil tab and the metal belt tab.

[0018] According to the second aspect embodiment of the utility model, the electric equipment includes the battery of any one of the first aspect embodiment.

[0019] According to the power equipment provided by the embodiment of the utility model, at least has following beneficial effect: the shell has storage cavity, storage cavity includes first cavity and second cavity, because the height of second cavity is greater than the height of first cavity, therefore can set up foil tab and metal band tab in second cavity, thereby effectively avoid metal band tab occupies more space in the length direction of battery, this can effectively avoid the energy density of battery is lower.

[0020] Additional aspects and advantages of the utility model will be in part given in the following description, part will become obvious from the following description, or be understood by the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0021] The utility model will be further explained in combination with the drawings and examples, wherein:

[0022] Figure 1 It is the schematic diagram of battery of first embodiment of the utility model;

[0023] Figure 2 It is the schematic diagram of shell in battery of some embodiments of the utility model;

[0024] Figure 3 It is the schematic diagram of battery of second embodiment of the utility model;

[0025] Figure 4 It is the schematic diagram of battery of third embodiment of the utility model;

[0026] Figure 5 It is the schematic diagram of battery of fourth embodiment of the utility model.

[0027] Reference signs:

[0028] Battery 10, electric core 100, main body 110, foil tab 120, metal band tab 200, shell 300, storage cavity 310, first cavity 320, second cavity 330, shell 400, first body part 410, first convex part 420, cover plate 500, second body part 510, second convex part 520, first insulating piece 600, accommodating groove 610, second insulating piece 700, third insulating piece 800, through hole 810, pole 900, tab rubber 1000. DETAILED DESCRIPTION

[0029] The embodiments of the present application are described below in detail, examples of the embodiments 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 referring to the drawings are exemplary, only for explaining the present application, and cannot be understood as a limitation of the present application.

[0030] In the description of the present application, it should be understood that, if the orientation description, such as the upper, lower, front, rear, left, right and other indications of the orientation or position relationship is based on the orientation or position relationship shown in the drawings, 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.

[0031] 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 and the like are not included in the number, above, below, within and the like are included in the number. If the first, second is described, 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 order of indicated technical features.

[0032] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting and the like 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 according to the specific content of the technical scheme.

[0033] In the description of the present application, the description of the reference terms "one embodiment", "some embodiments", "illustrative 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 illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0034] 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 storage battery and the like, and the present application embodiment is not limited thereto.

[0035] A battery generally includes an electrode group. The electrode group includes a positive electrode, a negative electrode, and a separator. During charging and discharging of the battery, active ions (e.g., lithium ions) are intercalated and deintercalated between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, and can function to prevent short-circuiting between the positive electrode and the negative electrode while allowing the active ions to pass therethrough.

[0036] 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.

[0037] As an example, the positive electrode current collector has two surfaces opposite in the thickness direction thereof, and the positive electrode active material is disposed on either one or both of the two surfaces of the positive electrode current collector.

[0038] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as the metal foil, aluminum plated with silver on the surface, stainless steel plated with silver on the surface, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, or the like can be used. 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 (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, or the like) on a polymer material base material (e.g., a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0039] As an example, the positive active material can include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive active material can also be used. These positive active materials can be used alone only one or two or more can be used in combination. Among them, examples of the lithium-containing phosphate can include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (which can also be referred to as LFP)), a composite of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite of lithium manganese phosphate and carbon, lithium manganese iron phosphate, a composite of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide 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 LiNi1 / 3Co1 / 3Mn1 / 3O2 (which can also be referred to as NCM333), LiNi0.5Co0.2Mn0.3O2 (which can also be referred to as NCM523), LiNi0.5Co0.25Mn0.25O2 (which can also be referred to as NCM211), LiNi0.6Co0.2Mn0.2O2 (which can also be referred to as NCM622), LiNi0.8Co0.1Mn0.1O2 (which can also be referred to as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi0.85Co0.15Al0.05O2), and modified compounds thereof.

[0040] In some embodiments, the positive electrode can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. When the foamed metal is used as the positive electrode, the foamed metal surface can not be provided with a positive active material, or of course can be provided with a positive active material. As an example, the foamed metal can also be filled or / and deposited with a lithium source material, potassium metal, or sodium metal, the lithium source material being lithium metal and / or a lithium-rich material.

[0041] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0042] As an example, the negative 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, etc. can be employed. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, etc. 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, etc.) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0043] As an example, the negative electrode sheet can include a negative current collector and a negative active material disposed on at least one surface of the negative current collector.

[0044] As an example, the negative current collector has two surfaces opposite in a thickness direction thereof, and the negative active material is disposed on either one or both of the two opposite surfaces of the negative current collector.

[0045] As an example, the negative active material can employ a negative active material for a battery 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.

[0046] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0047] In some embodiments, the battery cell further includes a separator disposed between the positive electrode and the negative electrode.

[0048] In some embodiments, the separator is a separator film. The separator film can be of various types, and any known porous structure separator film having good chemical stability and mechanical stability can be used.

[0049] 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.

[0050] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the anode and the cathode, and functions to transport ions and to separate the anode and the cathode.

[0051] In some embodiments, the battery further includes an electrolyte that functions to conduct ions between the anode and the cathode. The electrolyte can be in a liquid state, a gel state, or a solid state. In some embodiments, the liquid electrolyte includes an electrolyte salt and a solvent.

[0052] 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 difluoro oxalato borate, lithium bis-oxalato borate, lithium difluoro bis-oxalato phosphate, and lithium tetrafluoro oxalato phosphate.

[0053] 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, butyrosulfone, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent can also be an ether solvent. The ether solvent 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 a crown ether.

[0054] In some embodiments, the gel-state electrolyte includes a polymer as a backbone network of the electrolyte, in combination with an ionic liquid-lithium salt.

[0055] In some embodiments, the solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, a composite solid-state electrolyte.

[0056] As an example, the polymer solid-state 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, a cellulose, or the like.

[0057] As an example, the inorganic solid-state electrolyte can include one or more of an oxide solid-state electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), a sulfide solid-state electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorous sulfide, argyrodite), amorphous sulfide), a halide solid-state electrolyte, a nitride solid-state electrolyte, and a hydride solid-state electrolyte.

[0058] As an example, the composite solid-state electrolyte is formed by adding inorganic solid-state electrolyte fillers in a polymer solid-state electrolyte.

[0059] In some embodiments, the battery cell is in a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound to form the jelly-roll structure.

[0060] In some embodiments, the battery cell is in a stack structure.

[0061] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be provided respectively and arranged alternately.

[0062] As an example, a plurality of positive electrode sheets can be provided, and the negative electrode sheet is folded to form a plurality of folded segments arranged in layers, and one positive electrode sheet is clamped between adjacent folded segments.

[0063] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded segments arranged in layers.

[0064] As an example, a plurality of separators can be provided and arranged between any adjacent positive electrode sheets or negative electrode sheets.

[0065] As an example, the separators can be arranged continuously and arranged between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0066] In some embodiments, the battery cell can have a cylindrical shape, a flat shape, or a multi-prism shape, etc.

[0067] In some embodiments, the battery cell can be provided with a tab, and the tab can guide current out of the battery cell. The tab includes a positive tab and a negative tab.

[0068] In some embodiments, the battery can include a housing. The housing is used to encapsulate the battery cell and other components such as electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc.

[0069] As an example, the battery can be a cylindrical battery, a prismatic battery, a pouch battery, or a battery of other shapes, and the prismatic battery includes but is not limited to a square battery, a blade battery, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prismatic battery, etc.

[0070] The battery referred to in the embodiments of the present application refers to a single physical module including one or more batteries to provide higher voltage and capacity.

[0071] 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.

[0072] In some embodiments, the battery can be a battery pack, and the battery pack includes a box and a battery, and the battery or the battery module is contained in the box.

[0073] In some embodiments, the box can be part of a chassis structure of a vehicle. For example, portions of the box can become at least part of a floor of the vehicle, or portions of the box can become at least part of cross members and longitudinal members of the vehicle.

[0074] 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, an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0075] In the related art, a battery includes a cell and a shell. The shell is provided with a storage cavity, and the cell is arranged in the storage cavity. After the cell is arranged in the storage cavity, the cell is connected with the outside through a pole. Specifically, the cell is provided with a foil tab, and the two ends of a metal strip tab are respectively welded with the foil tab and the pole, so that the cell is connected with the outside through the foil tab, the metal strip tab and the pole. Further, since the metal strip tab occupies a certain space in the length direction of the storage cavity, it will cause the battery to have a low energy density. Therefore, the present application provides a battery.

[0076] Please refer to Figures 1 to 5In some embodiments, the battery 10 includes: a cell 100, a metal strip tab 200, and a casing 300. The cell 100 includes a body 110 and foil tabs 120, with the foil tabs 120 connected to the body 110. The body 110 includes a positive electrode and a negative electrode. Two foil tabs 120 are provided, each connected to the positive and negative electrode respectively. The foil tabs 120 can be integrally formed with the positive electrode and the negative electrode. The body 110 can be formed by winding or stacking the positive and negative electrode sheets. The metal strip tabs 200 are connected to the foil tabs 120. Specifically, the metal strip tabs 200 can be welded to the foil tabs 120. The outer casing 300 is provided with a storage cavity 310. The outer casing 300 can be made of metal. Two metal strip tabs 200 can be provided, each connected to one of two foil tabs 120. That is, one metal strip tab 200 is positively charged, and the other is negatively charged. The negatively charged metal strip tab 200 can be soldered to the outer casing 300, thereby making the outer casing 300 negatively charged. The storage cavity 310 includes a first cavity 320 and a second cavity 330 that are interconnected. The height of the first cavity 320 is less than the height of the second cavity 330. Both the foil tabs 120 and the metal strip tabs 200 are disposed in the second cavity 330. Specifically, the outer casing 300 has a storage cavity 310, which includes a first cavity 320 and a second cavity 330. Since the height of the second cavity 330 is greater than the height of the first cavity 320, the foil tab 120 and the metal strip tab 200 can be disposed in the second cavity 330, thereby effectively avoiding the metal strip tab 200 occupying too much space in the length direction of the battery 10. This can effectively prevent the battery 10 from having a low energy density. In particular, the battery 10 can have a high energy density.

[0077] Further explanation is provided below; please refer to... Figure 2 Specifically, the height of the first cavity 320 being less than the height of the second cavity 330 means that when the outer casing 300 is placed flat on a horizontal surface, the height of the first cavity 320 is less than the height of the second cavity 330. Furthermore, since the height and width of the outer casing 300 can vary depending on its orientation and the reference surface, the height of the first cavity 320 being less than the height of the second cavity 330 can also mean that the width of the first cavity 320 is less than the width of the second cavity 330. Alternatively, the second cavity 330 can protrude relative to the first cavity 320. This protruding portion of the second cavity 330 relative to the first cavity 320 allows the metal tab 200 to be bent and housed within it. This allows the metal tab 200 to be conveniently positioned in the storage cavity 310 while maintaining the same length of the outer casing 300, resulting in a higher energy density for the battery 10.

[0078] Further, the specific structure of the shell 300 is described below. Please refer to Figure 1 In some embodiments, the shell 300 includes a housing 400 and a cover plate 500. The shape of the housing 400 can be a cuboid or a cube. The housing 400 and the cover plate 500 jointly define the storage cavity 310. Specifically, the housing 400 can have a cavity, and the cover plate 500 can be connected to the housing 400 to close the cavity to form the storage cavity 310. The housing 400 includes a first body portion 410 and a first protruding portion 420 connected to the first body portion 410 and protruding relative to the first body portion 410. Specifically, the first protruding portion 420 protrudes relative to the first body portion 410, which can make the storage cavity 310 into two cavities, i.e., a first cavity 320 and a second cavity 330. The length of the first cavity 320 can be greater than the length of the second cavity 330. By increasing the height of the second cavity 330, the metal tab 200 can be placed therein, so that the height of the first cavity 320 does not need to be increased. This can make the thickness of most areas of the shell 300 still small, without further increasing the volume of the power storage compartment of the electric device.

[0079] Further, the shell 300 has other structures in addition to the above structure. Please refer to Figure 4 In some embodiments, the shell 300 includes a housing 400 and a cover plate 500, and the housing 400 and the cover plate 500 jointly define the storage cavity 310. The cover plate 500 includes a second body portion 510 and a second protruding portion 520 connected to the second body portion 510 and protruding relative to the second body portion 510. Specifically, the housing 400 can have a cavity, and the cover plate 500 can also have a cavity. After the housing 400 and the cover plate 500 are connected, the cavity of the housing 400 and the cavity of the cover plate 500 jointly form the storage cavity 310. The second protruding portion 520 protrudes relative to the second body portion 510, which can make the storage cavity 310 into two cavities, i.e., a first cavity 320 and a second cavity 330. The length of the first cavity 320 can be greater than the length of the second cavity 330. By increasing the height of the second cavity 330, the metal tab 200 can be placed therein, so that the height of the first cavity 320 does not need to be increased. This can make the thickness of most areas of the shell 300 still small, without further increasing the volume of the power storage compartment of the electric device.

[0080] Further, in some embodiments, please refer to Figure 1The battery 10 further comprises a first insulating member 600, which is arranged in the second cavity 330, and the first insulating member 600 is provided with a receiving groove 610, and the metal strip tab 200 is arranged in the receiving groove 610. Specifically, as mentioned above, in some cases, one of the metal strip tabs 200 can be electrically connected to the shell 300, so that the shell 300 is electrified. In order to effectively avoid the short circuit of the battery 10, it is necessary to avoid the electrical connection between the other metal strip tab 200 and the shell 300, and therefore, by arranging the receiving groove 610 through the first insulating member 600 and arranging the metal strip tab 200 in the receiving groove 610, the safety of the battery 10 can be improved. Specifically, the first insulating member 600 arranged in the second cavity 330 can be in the shape of "]", and the metal strip tab 200 and the shell 300 are separated by the first insulating member 600. The material of the first insulating member 600 can be plastic or ceramic, and is not limited here.

[0081] Further, please refer to Figures 3 to 5 In some embodiments, the shell 300 comprises a housing 400 and a cover plate 500, and the housing 400 and the cover plate 500 jointly define the storage cavity 310. The battery 10 further comprises a first insulating member 600 and a second insulating member 700, the first insulating member 600 is connected to the housing 400, and the second insulating member 700 is connected to the cover plate 500, or the first insulating member 600 is connected to the cover plate 500, and the second insulating member 700 is connected to the housing 400, and the first insulating member 600 and the second insulating member 700 jointly define the receiving groove 610, and the metal strip tab 200 is arranged in the receiving groove 610. Specifically, in this embodiment, the shape of the first insulating member 600 can be "]", and the shape of the second insulating member 700 can be "-", and by the cooperation of the first insulating member 600 and the second insulating member 700, the safety of the battery 10 can be improved, and the short circuit between the metal strip tab 200 and the shell 300 can be effectively avoided. Specifically, the second insulating member 700 connected to the cover plate 500 can be that the second insulating member 700 is bonded to the cover plate 500, which can improve the manufacturing efficiency of the battery 10. In addition, the first insulating member 600 and the second insulating member 700 can be connected as a whole, and the first insulating member 600 and the second insulating member 700 can be separated from each other.

[0082] Further, in some embodiments, the difference between the height of the first cavity 320 and the height of the second cavity 330 is L1, L1≥1mm. Specifically, the difference between the height of the first cavity 320 and the height of the second cavity 330 can be 1mm, 1.2mm, 1.3mm, 1.5mm, 1.9mm, 2mm or 3mm. When the difference between the height of the second cavity 330 and the height of the first cavity 320 is less than 1mm, the second cavity 330 can not be able to completely accommodate the metal strip tab 200, thus the length of the battery 10 needs to be increased, which can result in a lower energy density of the battery 10. Further, the thickness of the main body 110 can be 1mm, and the length of the metal strip tab 200 after being bent can be 2mm. The height of the first cavity 320 can be 1.3mm. The thickness of the first insulating member 600 and the thickness of the second insulating member 700 can be 0.6mm.

[0083] Further, please refer to Figures 3 to 5 In some embodiments, the battery 10 further comprises a pole 900, which can realize the conduction between the metal strip tab 200 and the outside, i.e. the conduction between the electric current of the battery 10 and the outside. The pole 900 is insulatedly connected to the shell 300, the pole 900 is welded with the metal strip tab 200, and a part of the pole 900 is arranged in the second cavity 330, and another part of the pole 900 protrudes relative to the shell 300 along the thickness (height) direction of the shell 300. Specifically, after the other part of the pole 900 protrudes relative to the shell 300 along the thickness direction of the shell 300, the pole 900 can be arranged on the surface of the shell 300 with the largest area. In the prior art, the pole 900 can be arranged on other surfaces of the shell 300, thus the length of the battery 10 is equal to the length of the pole 900 protruding from the surface plus the length of the shell 300. After the pole 900 is arranged on the surface of the shell 300 with the largest area, the length of the battery 10 is equal to the length of the shell 300, thus this can effectively reduce the length of the battery 10 and increase the energy density of the battery 10. In addition, in this embodiment, the foil tab 120 and the metal strip tab 200 can be conveniently welded without tilting the welding head, which can improve the welding effect.

[0084] Further, please refer to Figures 3 to 5In some embodiments, the battery 10 further comprises a first insulating piece 600 and a third insulating piece 800. The first insulating piece 600 is arranged in the second cavity 330, and the first insulating piece 600 is provided with a receiving groove 610 in which the metal strip tab 200 is arranged. The two ends of the third insulating piece 800 are respectively connected to the opposite groove walls of the receiving groove 610. The shape of the first insulating piece 600 can be "]", and the shape of the third insulating piece 800 can be "|". After the two ends of the third insulating piece 800 are respectively connected to the groove walls of the receiving groove 610, the receiving groove 610 becomes a cavity that penetrates through two sides, which can effectively isolate the metal strip tab 200, thereby avoiding the short circuit of the battery 10. The third insulating piece 800 is provided with a through hole 810, and the foil tab 120 is arranged to pass through the through hole 810 and be connected to the metal strip tab 200. By arranging the through hole 810 on the third insulating piece 800, the foil tab 120 can be conveniently connected to the metal strip tab 200.

[0085] Further, please refer to Figures 3 to 5 In some embodiments, the battery 10 further comprises a tab adhesive 1000, which covers the main body 110, the foil tab 120 and the metal strip tab 200. Specifically, the tab adhesive 1000 can be provided with two, one end of one tab adhesive 1000 is bonded to one side of the main body 110, and then the foil tab 120 is covered until the other end is bonded to the metal strip tab 200. One end of the other tab adhesive 1000 can be bonded to the other side of the main body 110, and then the foil tab 120 and part of the metal strip tab 200 are covered. The tab adhesive 1000 can cover the welding marks of the foil tab 120 and the metal strip tab 200, preventing the welding burr from damaging the battery 10. In addition, the tab adhesive 1000 can also effectively prevent the metal strip tab 200 from contacting the shell 300.

[0086] In some embodiments, the electrical device comprises the battery 10 of any one of the above embodiments. Specifically, the shell 300 has a storage cavity 310, and the storage cavity 310 comprises a first cavity 320 and a second cavity 330. Since the height of the second cavity 330 is greater than the height of the first cavity 320, the foil tab 120 and the metal strip tab 200 can be arranged in the second cavity 330, thereby effectively avoiding the metal strip tab 200 occupying more space in the length direction of the battery 10, which can effectively avoid the low energy density of the battery 10. Specifically, the battery 10 can have a higher energy density. Further, the electrical device with the battery 10 has a stronger endurance.

[0087] 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 of the art person who possesses under the premise of not departing from the utility model 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: an electric core comprising a main body and a foil tab connected to the main body; a metal strip tab connected to the foil tab; a shell provided with a storage cavity, the storage cavity comprising a first cavity and a second cavity in communication with each other, the height of the first cavity being less than the height of the second cavity, the foil tab and the metal strip tab being arranged in the second cavity.

2. The battery of claim 1, wherein, The shell comprises a shell body and a cover plate, the shell body and the cover plate jointly defining the storage cavity, the shell body comprising a first body portion and a first protruding portion connected to the first body portion and protruding relative to the first body portion.

3. The battery of claim 1, wherein, The shell comprises a shell body and a cover plate, the shell body and the cover plate jointly defining the storage cavity, the cover plate comprising a second body portion and a second protruding portion connected to the second body portion and protruding relative to the second body portion.

4. The battery of claim 1, wherein, The battery further comprises a first insulating member arranged in the second cavity, the first insulating member being provided with a receiving groove, the metal strip tab being arranged in the receiving groove.

5. The battery of claim 1, wherein, The shell comprises a shell body and a cover plate, the shell body and the cover plate jointly defining the storage cavity, the battery further comprising a first insulating member and a second insulating member, the first insulating member being connected to the shell body, the second insulating member being connected to the cover plate, the first insulating member and the second insulating member jointly defining a receiving groove, the metal strip tab being arranged in the receiving groove.

6. The battery of claim 1, wherein, The difference between the height of the first cavity and the height of the second cavity is L1, L1≥1mm.

7. The battery of claim 1, wherein, The battery further comprises a post insulatedly connected to the shell, the post being welded to the metal strip tab, a portion of the post being arranged in the second cavity, another portion of the post protruding relative to the shell in the thickness direction of the shell.

8. The battery of claim 7, wherein, The battery further comprises a first insulating member and a third insulating member, the first insulating member being arranged in the second cavity, the first insulating member being provided with a receiving groove, the metal strip tab being arranged in the receiving groove, the third insulating member having two ends connected to opposite groove walls of the receiving groove respectively, the third insulating member being provided with a through hole, the foil tab being arranged in the through hole and connected to the metal strip tab.

9. The battery of claim 1, wherein, The battery further comprises a tab rubber covering the main body, the foil tab and the metal strip tab.

10. An electrical device, characterized by The battery comprises any one of the batteries according to claims 1 to 9.

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