Battery and electric equipment

Abstract

The utility model discloses a battery and electric equipment. The battery comprises a battery cell and a battery cover, 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, the cavity wall of the storage cavity comprises two first walls which are oppositely arranged, two second walls which are oppositely arranged and two third walls which are oppositely arranged, two ends of the second walls are respectively connected to the two third walls, the two second walls and the two third walls are connected to the first wall in a surrounding manner, the area of the first walls is larger than that of the second walls and that of the third walls, the two first walls are respectively arranged on two sides of the battery cell along the thickness direction of the battery cell, the thickness of at least one second wall is H1, the thickness of the sealing part is H2, and H1 is less than 1 / 2H2. 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, a battery includes a shell and a cell. The shell has a storage cavity, and the cell is arranged in the storage cavity. The shell mainly plays a protective and packaging role. It prevents the cell from being physically damaged by external factors such as impact and extrusion, and also prevents the chemical substances inside the cell from leaking. The shell is usually divided into two types: one is an aluminum plastic film, and the other is a metal shell.

[0003] The energy density of the battery includes the volumetric energy density, which refers to the ratio of the energy of the battery to the volume. That is, by improving the volume utilization rate of the battery, the energy density of the battery can be improved. Among them, the existing aluminum plastic film is packed into the cell, and there is a problem of low energy density. SUMMARY

[0004] The utility model aims at at least solves one of the prior art technical problems. Therefore, the utility model provides a battery, which can have a high energy density.

[0005] The utility model further provides an electrical equipment.

[0006] According to the battery of the first aspect of the utility model, comprising:

[0007] The cell;

[0008] The shell includes 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 cell is arranged in the storage cavity. The cavity wall of the storage cavity includes two oppositely arranged first walls, two oppositely arranged second walls, and two oppositely arranged third walls. The two ends of the second wall are respectively connected to two third walls. Two second walls and two third walls surround the first wall. The area of the first wall is greater than the area of the second wall and the area of the third wall. Along the thickness direction of the cell, two first walls are respectively arranged on both sides of the cell. The thickness of at least one second wall is H1, the thickness of the sealing part is H2, and H1 < 1 / 2 H2.

[0009] The battery has at least the following beneficial effects: the battery cell can be arranged in the storage cavity, the thickness of the second wall of the storage cavity is less than the thickness of the sealing part, the thickness of the storage part and the sealing part is consistent in the prior art, and in the application, the thickness of the second wall is less than half the thickness of the sealing part, that is, by reducing the thickness of the cavity wall of the storage cavity, the volume of the storage cavity can be increased, so that the volume of the battery cell is further increased, and the energy density of the battery is improved.

[0010] According to some embodiments of the battery of the utility model, the thickness of two second walls is H1.

[0011] According to some embodiments of the battery of the utility model, the thickness of the third wall is equal to the thickness of the second wall.

[0012] According to some embodiments of the battery of the utility model, the thickness of the first wall is equal to the thickness of the second wall.

[0013] According to some embodiments of the battery of the utility model, the thickness of one second wall is H1, and the thickness of the other second wall is H3, and H1

[0014] According to some embodiments of the battery of the utility model, the second wall comprises a first outer layer, a first metal layer and a first heat sealing layer which are sequentially stacked, the sealing part comprises two second outer layers, two second metal layers and a second heat sealing layer, the second outer layer, the second metal layer, the second heat sealing layer, the second metal layer and the second outer layer are sequentially stacked, the thickness of the first outer layer is equal to the thickness of the second outer layer, the thickness of the first metal layer is equal to the thickness of the second metal layer, and the thickness of the first heat sealing layer is less than the thickness of the second heat sealing layer.

[0015] According to some embodiments of the battery of the utility model, the second wall comprises a first outer layer and a first metal layer which are stacked.

[0016] According to some embodiments of the battery of the utility model, the sealing part comprises two second outer layers, two second metal layers and a second heat sealing layer, the second outer layer, the second metal layer, the second heat sealing layer, the second metal layer and the second outer layer are sequentially stacked, the thickness of the first metal layer is A, the thickness of the second metal layer is B, and 1 / 2B

[0017] According to the battery of some embodiments of the utility model, the cavity wall of the storage cavity further includes a circular arc wall, the first wall is connected to one end of the circular arc wall, two second walls and two third walls are connected to the other end of the circular arc wall, the first wall, the second wall and the third wall all include a first outer layer and a first metal layer which are arranged in layers, and the circular arc wall includes a third outer layer, a third metal layer and a third heat sealing layer which are arranged in layers.

[0018] According to the battery of some embodiments of the utility model, the friction coefficient of the cavity wall of the storage cavity is Y, and 0.3 < Y < 2.5.

[0019] According to the battery of some embodiments of the utility model, the storage part is provided with a first cavity, the cover part is provided with a second cavity, and the first cavity and the second cavity are communicated to form the storage cavity.

[0020] According to the battery of some embodiments of the utility model, the depth of the second cavity is less than the depth of the first cavity.

[0021] According to the battery of some embodiments of the utility model, the depth of the second cavity is less than the depth of the first cavity.

[0022] According to the battery of some embodiments of the utility model, the depth of the second cavity is less than the depth of the first cavity.

[0023] Additional aspects and advantages of the utility model will be given in part in the following description, part will become obvious from the following description, or be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0024] The utility model will be further explained in combination with the drawings and embodiments, wherein:

[0025] Figure 1 It is the schematic diagram of the battery of the first embodiment of the utility model;

[0026] Figure 2 It is the schematic diagram of the second wall in the battery of some embodiments of the utility model;

[0027] Figure 3 It is the schematic diagram of the battery of the second embodiment of the utility model;

[0028] Figure 4 A schematic view of a battery of a third embodiment of the utility model;

[0029] Figure 5 A schematic view of a battery of a fourth embodiment of the utility model;

[0030] Figure 6 A schematic view of a middle shell of a battery of a first embodiment of the utility model;

[0031] Figure 7 A schematic view of a middle shell of a battery of a second embodiment of the utility model;

[0032] Figure 8 A schematic view of a battery of a fifth embodiment of the utility model;

[0033] Figure 9 A schematic view of a battery of a sixth embodiment of the utility model.

[0034] Reference signs:

[0035] Battery 10, cell 100, shell 200, seal part 210, second outer layer 211, second metal layer 212, second heat seal layer 213, storage part 220, first cavity 221, cover part 230, second cavity 231, storage cavity 240, first wall 241, second wall 242, first outer layer 243, first metal layer 244, first heat seal layer 245, third wall 246, arc wall 247, third outer layer 248, third metal layer 249, third heat seal layer 250. DETAILED DESCRIPTION

[0036] The embodiments of the utility model will be described in detail below, examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as the limitation of the utility model.

[0037] In the description of the utility model, it needs to be understood that the orientation description, such as 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, only for the convenience of describing the utility model and simplifying the description, and is not indicative or implied that the indicated device or element must have a particular orientation, a particular orientation and operation, therefore, it cannot be understood as the limitation of the utility model.

[0038] In the description of the utility model, if several meanings are more than one, the meaning of multiple is more than two, greater than, less than, more than, etc. Understand as not including the number, above, below, within, etc. Understand as including the number. If it is described to the first, the second is only used for distinguishing the purpose of technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the relationship between the indicated technical features.

[0039] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installation, connection should be understood broadly, and the person skilled in the art can determine the specific meaning of the above words in the utility model in combination with the specific content of the technical scheme.

[0040] In the description of the utility model, the description of reference terms such as “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 utility model. In the specification, the illustrative description of the above terms does not necessarily refer to 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.

[0041] 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, etc. The present application embodiment is not limited thereto.

[0042] The battery generally includes a cell. The cell includes a positive electrode, a negative electrode and a separator. In the process of charging and discharging the battery, active ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time can make the active ions pass through.

[0043] 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 arranged on at least one surface of the positive electrode current collector.

[0044] As an example, the positive electrode current collector has two opposite surfaces in its own thickness direction, and the positive electrode active material is arranged on any one or both of the two opposite surfaces of the positive electrode current collector.

[0045] As an example, the positive electrode current collector can employ a metal foil or a composite current collector. For example, as a metal foil, aluminum subjected to silver plating on the surface, stainless steel subjected to silver plating on the surface, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, or the like can be employed. The composite current collector can include a high molecular material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, an aluminum alloy, nickel, a nickel alloy, titanium, a titanium alloy, silver, and a silver alloy, or the like) on a high molecular material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0046] As an example, the positive electrode 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 electrode active material can also be used. These positive electrode 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 LiFeP04 (which can also be referred to simply as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnP04), 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 the lithium transition metal oxide can include, but are not limited to, at least one of lithium cobalt oxide (such as LiCo02), lithium nickel oxide (such as LiNi02), lithium manganese oxide (such as LiMn02, LiMn204), 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 / 3 O2 (which can also be referred to simply as NCM333), LiNi 0.5 Co 0.2 Mn 0.3 O2 (which can also be referred to simply as NCM523), LiNi 0.5 Co 0.25 Mn 0.25 O2 (which can also be referred to simply as NCM211), LiNi 0.6 Co 0.2 Mn 0.2 O2 (which can also be referred to simply as NCM622), LiNi 0.8 Co 0.1 Mn 0.1 O2 (which can also be referred to simply as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2), and a modified compound thereof.

[0047] 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 be free of positive electrode active material, or can be provided with positive electrode active material. As an example, the foamed metal can be filled or / and deposited with a lithium source material, potassium metal or sodium metal. The lithium source material can be lithium metal and / or lithium-rich material.

[0048] In some embodiments, the negative electrode can be a negative electrode sheet, which can include a negative electrode current collector.

[0049] As an example, the negative electrode current collector can employ a metal foil, foamed metal or composite current collector. For example, as the metal foil, silver surface treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, nickel or titanium, etc. can be employed. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed 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.).

[0050] 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.

[0051] As an example, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is provided on either one or both of the two opposite surfaces of the negative electrode current collector.

[0052] As an example, the negative electrode active material can employ a negative electrode active material known in the art for use in a battery. As an example, the negative electrode active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based material, tin-based material, lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, silicon oxide compound, silicon-carbon composite, silicon-nitrogen composite and silicon alloy. The tin-based material can be selected from at least one of elemental tin, tin oxide compound and tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery negative electrode active material can also be used. These negative electrode active materials can be used alone or in combination of two or more.

[0053] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0054] In some embodiments, the battery cell further includes a separator disposed between the positive electrode and the negative electrode.

[0055] In some embodiments, the separator is a separator film. The separator film can be any porous structure separator film known to have good chemical stability and mechanical stability.

[0056] For example, the separator film can be made of 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. In the case of a multi-layer composite film, the materials of the layers can be the same or different. The separator can be a separate component between the positive and negative electrodes or can be attached to the surface of the positive and negative electrodes.

[0057] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive and negative electrodes and functions to transport ions and separate the positive and negative electrodes.

[0058] 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. In the case of a liquid electrolyte, the electrolyte includes an electrolyte salt and a solvent.

[0059] 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 oxalate borate, lithium bisoxalate borate, lithium difluoro bisoxalate phosphate, and lithium tetrafluoro oxalate phosphate.

[0060] 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, 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 crown ether.

[0061] In the case of a gel electrolyte, the gel electrolyte includes a polymer as a skeleton network of the electrolyte, in combination with an ionic liquid-lithium salt.

[0062] In the case of a solid-state electrolyte, the solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, or a composite solid-state electrolyte.

[0063] 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.

[0064] 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 film), a sulfide solid-state electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorous sulfide, argyrodite), amorphous sulfide), and a halide solid-state electrolyte, a nitride solid-state electrolyte, and a hydride solid-state electrolyte.

[0065] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

[0066] In some embodiments, the electric core is in a jelly-roll structure. The positive electrode sheet and the negative electrode sheet are wound into the jelly-roll structure.

[0067] In some embodiments, the electric core is in a stacked structure.

[0068] 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 are alternately stacked.

[0069] 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 that are stacked. One positive electrode sheet is clamped between adjacent folded segments.

[0070] As an example, the positive electrode sheet and the negative electrode sheet are both folded to form a plurality of folded segments that are stacked.

[0071] As an example, a plurality of separators can be provided, and each of the plurality of separators is provided between any adjacent positive electrode sheet or negative electrode sheet.

[0072] As an example, the separators can be continuously provided, and each of the separators is provided between any adjacent positive electrode sheet or negative electrode sheet by folding or winding.

[0073] In some embodiments, the electric core can have a cylindrical shape, a flat shape, or a polygonal shape.

[0074] In some embodiments, the electric core can be provided with a tab. The tab can guide current out of the electric core. The tab can include a positive tab and a negative tab.

[0075] In some embodiments, the battery can include a housing. The housing can be used to encapsulate the electric core and other components such as the electrolyte. The housing can be a steel shell, an aluminum shell, a plastic shell (such as a polypropylene shell), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, or the like.

[0076] As an example, the battery can be a cylindrical battery, a prismatic battery, a pouch battery, or other shaped battery, the prismatic battery including but not limited to a square battery, a blade battery, a multi-prismatic battery, for example, a hexagonal prismatic battery, etc.

[0077] 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.

[0078] 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.

[0079] In some embodiments, the battery can be a battery pack, and the battery pack includes a box and a battery, and the battery or battery module is contained in the box.

[0080] In some embodiments, the box can be part of the chassis structure of the 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 longitudinal beam of the vehicle.

[0081] The embodiments of the present application provide a power consuming device using a battery as a power source, which 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. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric plane toy, etc., and the spacecraft can include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0082] In the related art, the battery includes a shell and a battery core. The shell has a storage cavity, and the battery core is arranged in the storage cavity. The shell mainly plays a protective and packaging role. It prevents the battery core from being physically damaged by external factors such as impact, extrusion, etc., and also prevents the chemical substances inside the battery core from leaking. The shell is usually divided into two types, one is an aluminum plastic film, and the other is a metal shell.

[0083] The energy density of the battery includes the volume energy density, which refers to the ratio of the energy and the volume of the battery. That is, by improving the volume utilization rate of the battery, the energy density of the battery can be improved. Among them, the existing aluminum plastic film has the problem of low energy density after the battery core is packed. Therefore, the present application provides a battery.

[0084] Please refer to Figures 1 to 7 In some embodiments, the battery 10 includes a battery core 100 and a shell 200. The battery core 100 includes a positive electrode sheet and a negative electrode sheet, and the positive electrode sheet and the negative electrode sheet have a diaphragm therebetween. The positive electrode sheet and the negative electrode sheet can form a laminated battery core after being stacked, and the positive electrode sheet and the negative electrode sheet can also be wound to form a winding core. Figure 1 The winding core is shown,Figure 5 The laminated battery cell is illustrated. The shell 200 includes a sealing portion 210, a storage portion 220 and a cover portion 230. The shell 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, and the cover portion 230 and the storage portion 220 together define a storage cavity 240. Illustratively, the storage cavity 240 can be formed by punching a pit on the aluminum plastic film, and the sealing portion 210 can be formed by heat sealing the sealing edge of the aluminum plastic film. The battery cell 100 is arranged in the storage cavity 240, and the cavity wall of the storage cavity 240 includes two oppositely arranged first walls 241, two oppositely arranged second walls 242 and two oppositely arranged third walls 246. The two ends of the second wall 242 are respectively connected to the two third walls 246, and the two second walls 242 and the two third walls 246 surround the first wall 241. The area of the first wall 241 is greater than the area of the second wall 242 and the area of the third wall 246. Along the thickness direction of the battery cell 100, the two first walls 241 are respectively arranged on both sides of the battery cell 100. The thickness of at least one second wall 242 is H1, and the thickness of the sealing portion 210 is H2, H1 < 1 / 2H2. Specifically, the battery cell 100 can be arranged in the storage cavity 240, wherein the thickness of the second wall 242 of the storage cavity 240 is less than the thickness of the sealing portion 210. In the prior art, the thickness of the storage portion 220 and the sealing portion 210 is consistent, while in the present application, the thickness of the second wall 242 is less than half the thickness of the sealing portion 210, that is, by reducing the thickness of the cavity wall of the storage cavity 240, the volume of the storage cavity 240 can be increased, thereby further increasing the volume of the battery cell 100 and improving the energy density of the battery 10. Specifically, the battery 10 can have a higher energy density.

[0085] It is conceivable that the shell 200 can be a whole aluminum plastic film before processing, and after the aluminum plastic film is punched, an open storage cavity 240 can be formed. At this time, by thinning the thickness of the second wall 242, the volume of the storage cavity 240 can be increased. The thickness of the second wall 242 can be thinned with reference to Figure 2 , Figure 6 and Figure 7 , in order to further increase the volume of the storage cavity 240, the thickness of the two second walls 242 can be reduced. Specifically, in some embodiments, the thickness of the two second walls 242 is H1. The thickness of the second wall 242 can be reduced by a laser, which can be one of an infrared laser, an ultraviolet laser, a green laser and a carbon dioxide laser.

[0086] Further, when the battery cell 100 is placed in the storage cavity 240, the two first walls 241 are respectively on both sides of the battery cell 100 in the thickness direction, by reducing the thickness of the second wall 242, the size of the battery cell 100 in the length direction or the width direction can be increased, in order to increase the size of the battery cell 100 in the length direction and the width direction synchronously, the thickness of the third wall 246 can be equal to the thickness of the second wall 242. That is, please refer to Figures 1 to 7 In some embodiments, the thickness of the third wall 246 is equal to the thickness of the second wall 242. Wherein, the thickness reduction of the third wall 246 can also be realized by laser thinning.

[0087] Further, as mentioned above, by reducing the thickness of the second wall 242 and the third wall 246, the size of the battery cell 100 in the length direction and the width direction can be indirectly increased, in addition, the size of the battery cell 100 in the thickness direction can also be indirectly increased by reducing the thickness of the first wall 241. Therefore, please refer to Figures 1 to 7 In some embodiments, the thickness of the first wall 241 is equal to the thickness of the second wall 242. Specifically, the thickness of the second wall 242 can be equal to the thickness of the third wall 246, and the thickness of the first wall 241 can also be equal to the thickness of the second wall 242, in this way, the cavity wall of the storage cavity 240 is thinned as a whole, thereby increasing the volume of the storage cavity 240 and improving the energy density of the battery 10. In addition, it should be noted that the first wall 241, the second wall 242 and the third wall 246 can all be formed by an aluminum plastic film, that is, the first wall 241, the second wall 242 and the third wall 246 all include a nylon layer, an aluminum layer and a PP layer which are sequentially stacked. Wherein, the thinning process can be to thin the PP layer, such as to thin half of the thickness, or to remove the entire PP layer.

[0088] Further, the above introduces some specific structures of the cavity wall of the storage cavity 240, and there are other structures. In some embodiments, the thickness of one second wall 242 is H1, and the thickness of the other second wall 242 is H3, H1

[0089] Further, please refer to Figures 1 to 2In some embodiments, the second wall 242 comprises a first outer layer 243, a first metal layer 244 and a first heat-seal layer 245 which are sequentially stacked. The first outer layer 243 can be a nylon layer, the first metal layer 244 can be an aluminum layer, and the first heat-seal layer 245 can be a PP layer or a PE layer. The sealing part 210 comprises a second outer layer 211, a second metal layer 212 and a second heat-seal layer 213 which are sequentially stacked. The second outer layer 211 can be a nylon layer, the second metal layer 212 can be an aluminum layer, and the second heat-seal layer 213 can be a PP layer or a PE layer. The sealing part 210 can be two layers of aluminum plastic film connected together, i.e., the sealing part 210 comprises two second outer layers 211, two second metal layers 212 and a second heat-seal layer 213, and the second outer layer 211, the second metal layer 212, the second heat-seal layer 213, the second metal layer 212 and the second outer layer 211 are sequentially stacked. Specifically, H1<1 / 2H2 can be that the thickness of the first outer layer 243 is equal to the thickness of the second outer layer 211, the thickness of the first metal layer 244 is equal to the thickness of the second metal layer 212, and the thickness of the first heat-seal layer 245 is less than the thickness of the second heat-seal layer 213.

[0090] In some other embodiments, H1<1 / 2H2 can also be that the second wall 242 has no first heat-seal layer 245, and only has the first outer layer 243 and the first metal layer 244. That is, in some embodiments, the second wall 242 comprises the first outer layer 243 and the first metal layer 244 which are sequentially stacked.

[0091] In addition, the first metal layer 244 can also be thinned to improve the energy density. That is, please refer to Figure 1 and Figure 9 In some embodiments, the sealing part 210 comprises two second outer layers 211, two second metal layers 212 and a second heat-seal layer 213, and the second outer layer 211, the second metal layer 212, the second heat-seal layer 213, the second metal layer 212 and the second outer layer 211 are sequentially stacked, the thickness of the first metal layer 244 is A, the thickness of the second metal layer 212 is B, and 1 / 2B≤A≤B.

[0092] Further, please refer to Figure 8 In some embodiments, the cavity wall of the storage cavity 240 further comprises a circular arc wall 247, the first wall 241 is connected to one end of the circular arc wall 247, and the two second walls 242 and the two third walls 246 are connected to the other end of the circular arc wall 247. The first wall 241, the second wall 242 and the third wall 246 all comprise the first outer layer 243 and the first metal layer 244 which are sequentially stacked, and the circular arc wall 247 comprises a third outer layer 248, a third metal layer 249 and a third heat-seal layer 250 which are sequentially stacked. In this way, the circular arc wall 247 is not thinned during the punching of the aluminum plastic film, which can reduce the probability of damage to the aluminum plastic film.

[0093] Further, in some embodiments, the friction coefficient of the cavity wall of the storage cavity 240 is Y, 0.3 < Y < 2.5. Y can be specifically 0.4, 1, 2, 2.2 or 2.4. When the friction coefficient of the cavity wall of the storage cavity 240 is small, the battery cell 100 can move in the cavity wall of the storage cavity 240, thereby being damaged. When the friction coefficient of the cavity wall of the storage cavity 240 is large, although this can effectively avoid the battery cell 100 from sliding in the cavity wall of the storage cavity 240, the excessively large friction coefficient can result in an increase in manufacturing cost under the premise of protecting the battery cell 100.

[0094] Further, please refer to Figure 1 and Figure 7 In some embodiments, the storage portion 220 is provided with a first cavity 221, the cover portion 230 is provided with a second cavity 231, and the first cavity 221 and the second cavity 231 are communicated to form the storage cavity 240. Specifically, when the thickness of the battery cell 100 is large, two pits can be punched on the aluminum plastic film, that is, the storage portion 220 is provided with the first cavity 221, and the cover portion 230 is provided with the second cavity 231. The storage portion 220 provided with the first cavity 221 and the cover portion 230 provided with the second cavity 231 can effectively improve the work efficiency. In addition, in the case of a thick battery cell 100, selecting to punch double pits can ensure that the aluminum plastic film can fully wrap the battery cell 100, thereby avoiding that the deformation of one side is too large to break the aluminum plastic film due to exceeding the deformation limit of the aluminum plastic film.

[0095] Further, please refer to Figure 7 In some embodiments, the depth of the second cavity 231 is smaller than the depth of the first cavity 221. Specifically, the deeper first cavity 221 can be used to place the battery cell 100 when assembling the battery 10, thereby effectively fixing the battery cell 100, which can improve the assembly efficiency of the battery 10. In addition, the depths of the first cavity 221 and the second cavity 231 are different, which can make the height difference between the sealing portion 210 and the cover portion 230 small, thereby facilitating the folding of the heat-sealed edge.

[0096] Further, the manufacturing process of the battery 10 is as follows: the punched aluminum plastic film is cut to form the storage cavity 240; the cavity wall of the storage cavity 240 is thinned according to the required thickness; the thinned aluminum plastic film is detected again for the thinning depth appearance; the battery cell 100 is placed in the storage cavity 240 for packaging; and then baking and liquid injection are performed.

[0097] In some embodiments, the power consuming device comprises the battery 10 of any one of the above embodiments. Specifically, the battery cell 100 can be arranged in the storage cavity 240, wherein the thickness of the second wall 242 of the storage cavity 240 is less than the thickness of the sealing portion 210. In the prior art, the thickness of the storage portion 220 and the sealing portion 210 is consistent, while in the present application, the thickness of the second wall 242 is less than half the thickness of the sealing portion 210, that is, by reducing the thickness of the cavity wall of the storage cavity 240, the volume of the storage cavity 240 can be increased, thereby further increasing the volume of the battery cell 100 and improving the energy density of the battery 10. Specifically, the battery 10 can have a higher energy density. Further, the power consuming device with the battery 10 has stronger endurance.

[0098] The embodiments of the utility model are explained in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range possessed by the ordinary skilled in the art without departing from the purpose of the utility model. In addition, the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

Claims

1. A battery, characterized by, The battery comprises: an electric core; a shell comprising 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 electric core is arranged in the storage cavity, the cavity wall of the storage cavity comprises two oppositely arranged first walls, two oppositely arranged second walls and two oppositely arranged third walls, the 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 greater than the area of the second wall and the area of the third wall, two first walls are arranged on both sides of the electric core along the thickness direction of the electric core, the thickness of at least one second wall is H1, the thickness of the sealing part is H2, H1 < 1 / 2H2.

2. The battery of claim 1, wherein, The thickness of the two second walls is H1.

3. The battery according to claim 1 or 2, characterized in that, The thickness of the third wall is equal to the thickness of the second wall.

4. The battery according to claim 1 or 2, characterized by The thickness of the first wall is equal to the thickness of the second wall.

5. The battery of claim 1, wherein, The thickness of one second wall is H1, and the thickness of the other second wall is H3, H1 < H3.

6. The battery of claim 1, wherein, The second wall comprises a first outer layer, a first metal layer and a first heat sealing layer arranged in sequence, the sealing part comprises two second outer layers, two second metal layers and a second heat sealing layer, the second outer layer, the second metal layer, the second heat sealing layer, the second metal layer and the second outer layer are arranged in sequence, the thickness of the first outer layer is equal to the thickness of the second outer layer, the thickness of the first metal layer is equal to the thickness of the second metal layer, and the thickness of the first heat sealing layer is less than the thickness of the second heat sealing layer.

7. The battery of claim 1, wherein, The second wall comprises a first outer layer and a first metal layer arranged in sequence.

8. The battery of claim 7, wherein, The sealing part comprises two second outer layers, two second metal layers and a second heat sealing layer, the second outer layer, the second metal layer, the second heat sealing layer, the second metal layer and the second outer layer are arranged in sequence, the thickness of the first metal layer is A, the thickness of the second metal layer is B, and 1 / 2B ≤ A ≤ B.

9. The battery of claim 1, wherein, The cavity wall of the storage cavity further comprises a circular arc wall, the first wall is connected to one end of the circular arc wall, and two second walls and two third walls are connected to the other end of the circular arc wall; the first wall, the second wall and the third wall all comprise a first outer layer and a first metal layer arranged in sequence, and the circular arc wall comprises a third outer layer, a third metal layer and a third heat sealing layer arranged in sequence.

10. The battery of claim 1, wherein, The friction coefficient of the cavity wall of the storage cavity is Y, and 0.3 < Y < 2.

5.

11. The battery of claim 1, wherein, The storage part is provided with a first cavity, and the cover part is provided with a second cavity, the first cavity and the second cavity are communicated to form the storage cavity.

12. The battery of claim 11, wherein, The depth of the second cavity is less than the depth of the first cavity.

13. An electrical device, characterized by The battery comprises any one of claims 1-12.

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