Shell manufacturing method, shell and battery

Abstract

The invention discloses a shell manufacturing method, a shell and a battery, the shell manufacturing method comprises the following steps: processing a heat sealing layer to enable the heat sealing layer to have a processing area and a non-processing area, and setting the processing area as a through hole or a thinned groove; the heat sealing layer, the metal layer and the outer layer form a shell, a groove is formed in the shell, the groove is used for containing a battery cell, and the wall thickness of at least one groove wall of the groove is equal to the sum of the thickness of the processing area, the thickness of the metal layer and the thickness of the outer layer. According to the shell manufactured through the shell manufacturing method, the energy density of a battery can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a shell manufacturing method, a shell and a battery. Background Art

[0002] In the related art, the battery shell includes an aluminum-plastic film and a metal shell. The shell can encapsulate the battery cell to protect it. Taking the aluminum-plastic film as an example, the aluminum-plastic film can not only isolate the moisture between the positive and negative electrodes of the battery to prevent the evaporation of moisture and cause the battery capacity to decrease; it can also prevent internal short circuits and play a separating role at the same time, reducing the impact of short circuits or temperature rise on the battery as a whole and improving the safety performance of the battery. Among them, since the size of the battery is usually fixed and the energy density of the battery is low, how to increase the capacity of the battery cell by reducing the size of the shell becomes a difficult problem. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a shell manufacturing method, the shell manufactured by the method can effectively improve the energy density of the battery.

[0004] The invention also provides a housing.

[0005] The invention also provides a battery.

[0006] According to a first aspect of the present invention, the shell manufacturing method comprises the following steps: Processing the heat sealing layer so that the heat sealing layer has a processed area and an unprocessed area, wherein the processed area is configured as a through hole or a thinning groove; The heat-sealing layer, the metal layer and the outer layer form a shell, and a groove is formed on the shell, wherein the groove is used to accommodate the battery cell, wherein the wall thickness of at least one groove wall of the groove is equal to the sum of the thickness of the processing area, the thickness of the metal layer and the thickness of the outer layer.

[0007] According to the shell manufacturing method of the embodiment of the present invention, there are at least the following beneficial effects: by processing on the heat sealing layer, the heat sealing layer has a processing area and an unprocessed area, and the processing area can be set as a through hole or a thinning groove, and then the heat sealing layer, the metal layer and the outer layer are formed into a shell, and after the groove is formed on the shell, the wall thickness of at least one groove wall of the groove is the sum of the thickness of the processing area, the thickness of the metal layer and the thickness of the outer layer, that is, the thickness of at least one groove wall of the groove is less than the sum of the thickness of the heat sealing layer, the thickness of the metal layer and the thickness of the outer layer, because the heat sealing layer is processed. In the prior art, after the heat sealing layer, the metal layer and the outer layer form the shell, the wall thickness of the groove of the shell is the sum of the thickness of the heat sealing layer, the metal layer and the outer layer, and in the present application, the heat sealing layer is processed so that the thickness of at least one groove wall of the groove is smaller, which can effectively increase the volume of the groove, so that the groove can place more capacity batteries, so that the shell manufacturing method, the shell obtained can effectively improve the energy density of the battery. In addition, the shell manufacturing method can also improve work efficiency by processing the heat sealing layer separately.

[0008] According to some embodiments of the shell manufacturing method of the present invention, the groove includes two first walls arranged opposite to each other, two second walls arranged opposite to each other and a third wall, the two first walls and the two second walls are jointly surrounded and connected to the third wall, and the wall thickness of the third wall is equal to the sum of the thickness of the processing area, the thickness of the metal layer and the thickness of the outer layer.

[0009] According to the shell manufacturing method of some embodiments of the present invention, the wall thickness of at least one of the first walls is equal to the sum of the thickness of the processing area, the thickness of the metal layer and the thickness of the outer layer.

[0010] According to the shell manufacturing method of some embodiments of the present invention, the wall thickness of the two first walls is equal to the sum of the thickness of the processing area, the thickness of the metal layer and the thickness of the outer layer.

[0011] According to the shell manufacturing method of some embodiments of the present invention, the wall thickness of at least one of the second walls is equal to the sum of the thickness of the processing area, the thickness of the metal layer and the thickness of the outer layer.

[0012] According to the shell manufacturing method of some embodiments of the present invention, the wall thickness of the two second walls is equal to the sum of the thickness of the processing area, the thickness of the metal layer and the thickness of the outer layer.

[0013] According to some embodiments of the shell manufacturing method of the present invention, the groove includes two first walls arranged opposite to each other, two second walls arranged opposite to each other and a third wall, the two first walls and the two second walls are jointly surrounded and connected to the third wall, the wall thickness of one of the first walls is equal to the sum of the thickness of the processed area, the thickness of the metal layer and the thickness of the outer layer, and the wall thickness of the other first wall is equal to the sum of the thickness of the unprocessed area, the thickness of the metal layer and the thickness of the outer layer.

[0014] According to some embodiments of the shell manufacturing method of the present invention, the groove includes two first walls arranged opposite to each other, two second walls arranged opposite to each other and a third wall, the two first walls and the two second walls are jointly surrounded and connected to the third wall, the wall thickness of one of the second walls is equal to the sum of the thickness of the processed area, the thickness of the metal layer and the thickness of the outer layer, and the wall thickness of the other second wall is equal to the sum of the thickness of the unprocessed area, the thickness of the metal layer and the thickness of the outer layer.

[0015] The shell according to the embodiment of the second aspect of the present invention is manufactured by the shell manufacturing method described in any one of the embodiments of the first aspect.

[0016] The shell according to the embodiment of the present invention has at least the following beneficial effects: by processing on the heat sealing layer, the heat sealing layer has a processing area and an unprocessed area, and the processing area can be set as a through hole or a thinning groove, and then the heat sealing layer, the metal layer and the outer layer are formed into a shell, and after the groove is formed on the shell, the wall thickness of at least one groove wall of the groove is the sum of the thickness of the processing area, the thickness of the metal layer and the thickness of the outer layer, that is, the thickness of at least one groove wall of the groove is less than the sum of the thickness of the heat sealing layer, the thickness of the metal layer and the thickness of the outer layer, because the heat sealing layer is processed. In the prior art, after the heat sealing layer, the metal layer and the outer layer form the shell, the wall thickness of the groove of the shell is the sum of the thickness of the heat sealing layer, the metal layer and the outer layer, while in the present application, the heat sealing layer is processed so that the thickness of at least one groove wall of the groove is smaller, which can effectively increase the volume of the groove, so that the groove can hold more capacity batteries. In this way, the shell made by the shell manufacturing method can effectively improve the energy density of the battery.

[0017] A battery according to a third aspect of the present invention comprises: Battery cells; In the shell described in the embodiment of the second aspect, the battery cell is arranged in the groove.

[0018] According to the battery of the embodiment of the present invention, there are at least the following beneficial effects: by processing on the heat sealing layer, the heat sealing layer has a processing area and an unprocessed area, and the processing area can be set as a through hole or a thinning groove, and then the heat sealing layer, the metal layer and the outer layer form a shell, and after the groove is formed on the shell, the wall thickness of at least one groove wall of the groove is the sum of the thickness of the processing area, the thickness of the metal layer and the thickness of the outer layer, that is, the thickness of at least one groove wall of the groove is less than the sum of the thickness of the heat sealing layer, the thickness of the metal layer and the thickness of the outer layer, because the heat sealing layer is processed. In the prior art, after the heat sealing layer, the metal layer and the outer layer form the shell, the wall thickness of the groove of the shell is the sum of the thickness of the heat sealing layer, the metal layer and the outer layer, and in the present application, the heat sealing layer is processed so that the thickness of at least one groove wall of the groove is smaller, which can effectively increase the volume of the groove, so that the groove can place more capacity batteries, so that the shell made by the shell manufacturing method can effectively improve the energy density of the battery. Further, the energy density of the battery with the shell is high.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 Schematic diagram of a heat-sealing layer in a shell in some embodiments of the present invention; Figure 2 is a schematic diagram of a housing according to a first embodiment of the present invention; Figure 3 is a schematic diagram of a housing according to a second embodiment of the present invention; Figure 4 is a schematic diagram of a housing according to a third embodiment of the present invention; Figure 5 is a schematic diagram of a housing according to a fourth embodiment of the present invention; Figure 6 is a schematic diagram of a housing according to a fifth embodiment of the present invention; Figure 7 is a schematic diagram of a housing according to a sixth embodiment of the present invention; Figure 8 is a schematic diagram of a housing according to a seventh embodiment of the present invention; Fig. 9 is a schematic diagram of a housing according to an eighth embodiment of the present invention; Fig.10 is a schematic diagram of a housing according to a ninth embodiment of the present invention; Fig.11 is a schematic diagram of a housing according to a tenth embodiment of the present invention; Fig.12 is a schematic diagram of a housing according to an eleventh embodiment of the present invention; Fig.13 is a schematic diagram of a housing according to a twelfth embodiment of the present invention; Fig.14 is a schematic diagram of a housing according to a thirteenth embodiment of the present invention; Fig.15 is a schematic diagram of a housing according to a fourteenth embodiment of the present invention; Fig.16 It is a schematic diagram of a shell according to a fifteenth embodiment of the present invention.

[0021] Reference numerals: The shell 100 , the heat sealing layer 200 , the processing area 210 , the unprocessed area 220 , the metal layer 300 , the outer layer 400 , the groove 500 , the first wall 510 , the second wall 520 , the third wall 530 , the storage portion 600 , the cover portion 700 , and the sealing portion 800 . DETAILED DESCRIPTION

[0022] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0023] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0024] In the description of the present invention, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0025] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0026] In the description of the present invention, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0027] First, some information about batteries.

[0028] 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., which is not limited in the embodiments of the present application.

[0029] Batteries generally include cells. Cells include positive electrodes, negative electrodes, and separators. During the battery charging and discharging process, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator is set between the positive and negative electrodes to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0030] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0031] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0032] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0033] As an example, the positive electrode active material may 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 traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), 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 iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM333), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM523), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM211), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM622), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM811), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2)) and at least one of its modified compounds, etc.

[0034] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, etc. When the foamed metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foamed metal, but of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0035] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0036] As an example, the negative electrode current collector may be a metal foil, a foamed metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, nickel or titanium, etc. may be used. The foamed metal may be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. The composite current collector may include a polymer material base and a metal layer. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0037] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0038] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0039] As an example, the negative electrode active material may adopt the negative electrode active material for the battery known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials and lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0040] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0041] In some embodiments, the battery cell further includes a separator, which is disposed between the positive electrode and the negative electrode.

[0042] In some embodiments, the separator is a separator membrane. There may be many types of separator membranes, and any known porous separator membrane with good chemical stability and mechanical stability may be selected.

[0043] As an example, the material of the separator may include at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or may be attached to the surface of the positive and negative electrodes.

[0044] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0045] In some embodiments, the battery further comprises an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte may be liquid, gel or solid. The liquid electrolyte comprises an electrolyte salt and a solvent.

[0046] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0047] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl 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, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may 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, methyltetrahydrofuran, diphenyl ether and crown ether.

[0048] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0049] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0050] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, and the like.

[0051] As an example, the inorganic solid electrolyte may include an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0052] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0053] In some embodiments, the battery cell is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0054] In some embodiments, the battery cell has a stacked structure.

[0055] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0056] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0057] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0058] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0059] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0060] In some embodiments, the shape of the battery cell can be cylindrical, flat, or polygonal.

[0061] In some embodiments, the battery cell is provided with a tab, which can lead current out of the battery cell. The tab includes a positive tab and a negative tab.

[0062] In some embodiments, the battery may include a housing. The housing is used to encapsulate components such as the battery cell and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0063] As an example, the battery may be a cylindrical battery, a prismatic battery, a soft-pack battery or a battery of other shapes. Prismatic batteries include but are not limited to square-shell batteries, blade-shaped batteries, and polygonal batteries. Polygonal batteries may be, for example, hexagonal batteries.

[0064] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more batteries to provide higher voltage and capacity.

[0065] In some embodiments, the battery may be a battery module. When there are multiple batteries, the multiple batteries are arranged and fixed to form a battery module.

[0066] In some embodiments, the battery may be a battery pack, which includes a case and batteries, wherein the batteries or battery modules are accommodated in the case.

[0067] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0068] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0069] In the related art, the shell of the battery includes an aluminum-plastic film and a metal shell. The shell can encapsulate the battery cell to protect the battery cell. Taking the aluminum-plastic film as an example, the aluminum-plastic film can not only isolate the moisture between the positive and negative electrodes of the battery to prevent the evaporation of moisture and cause the battery capacity to decrease; it can also prevent internal short circuits and play a separating role at the same time, reducing the impact of short circuits or temperature increases on the battery as a whole and improving the safety performance of the battery. Among them, since the size of the battery is usually a fixed value and the energy density of the battery is low, how to increase the capacity of the battery cell by reducing the size of the shell becomes a difficult problem. To this end, the present application proposes a shell manufacturing method.

[0070] In some embodiments, the casing manufacturing method comprises the following steps: S100, processing the heat sealing layer 200 so that the heat sealing layer 200 has a processed area 210 and an unprocessed area 220, and the processed area 210 is set as a through hole or a thinning groove; S200, forming a shell 100 with the heat sealing layer 200, the metal layer 300 and the outer layer 400, forming a groove 500 on the shell 100, the groove 500 is used to accommodate the battery cell, wherein the wall thickness of at least one groove wall of the groove 500 is equal to the sum of the thickness of the processing area 210, the thickness of the metal layer 300 and the thickness of the outer layer 400.

[0071] For details, please refer to Figure 1 , Figure 1 The heat seal layer 200 is shown in FIG. Figures 2 to 16, by processing on the heat sealing layer 200, so that the heat sealing layer 200 has a processing area 210 and an unprocessed area 220, the processing area 210 can be set as a through hole or a thinning groove, and then the heat sealing layer 200, the metal layer 300 and the outer layer 400 are formed into a shell 100, and after the groove 500 is formed on the shell 100, the wall thickness of at least one groove wall of the groove 500 is the sum of the thickness of the processing area 210, the thickness of the metal layer 300 and the thickness of the outer layer 400, that is, the thickness of at least one groove wall of the groove 500 is less than the thickness of the heat sealing layer 200, the thickness of the metal layer 300 and the thickness of the outer layer 400. The sum of the thickness of the heat-sealing layer 200 and the outer layer 400 is because the heat-sealing layer 200 is processed. In the prior art, after the heat-sealing layer 200, the metal layer 300 and the outer layer 400 form the shell 100, the wall thickness of the groove 500 of the shell 100 is the sum of the thickness of the heat-sealing layer 200, the metal layer 300 and the outer layer 400. In the present application, the heat-sealing layer 200 is processed so that the thickness of at least one groove wall of the groove 500 is small, which can effectively increase the volume of the groove 500, so that the groove 500 can place more capacity batteries. In this way, the shell manufacturing method, the shell 100 obtained by the shell manufacturing method can effectively improve the energy density of the battery. In addition, the shell manufacturing method can also improve work efficiency by processing the heat-sealing layer 200 separately. That is, after processing the heat sealing layer 200, the heat sealing layer 200, the metal layer 300 and the outer layer 400 form the shell 100, which can also facilitate processing and improve efficiency. If the heat sealing layer 200, the metal layer 300 and the outer layer 400 are formed into the shell 100, and then the heat sealing layer 200 is processed, it will lead to greater processing difficulty. Therefore, the shell manufacturing method of the present application can improve processing efficiency.

[0072] To continue, please refer to Figures 2 to 16 The shell 100 includes a heat sealing layer 200, a metal layer 300 and an outer layer 400, and the heat sealing layer 200, the metal layer 300 and the outer layer 400 are stacked and bonded. The heat sealing layer 200 can be a PP layer, the metal layer 300 can be an aluminum layer, and the outer layer 400 can be a nylon layer. Before the heat sealing layer 200, the metal layer 300 and the outer layer 400 are bonded to each other, the heat sealing layer 200 can be processed first, and then the heat sealing layer 200, the metal layer 300 and the outer layer 400 are bonded to each other. After the heat sealing layer 200 is processed, an unprocessed area 220 and a processed area 210 are formed. The processed area 210 can be a through hole or a thinning groove. The through hole can be formed by cutting the heat sealing layer 200, and the thinning groove can be formed by laser processing. The schematic diagram of the processing area 210 as a through hole can be referred to Figure 2 , Figures 4 to 8 The schematic diagram of the processing area 210 as a thinning groove can be referred to Figures 9 to 16. After the heat seal layer 200 is processed into the processing area 210, the thickness of at least one groove wall of the groove 500 can be reduced, thereby expanding the volume of the groove 500. After the thinning groove is processed, the thickness of the original heat seal layer 200 can be reduced, thereby increasing the volume of the groove 500. In addition, it should be noted that the thinning groove can be formed by two parts. For example, a groove can be first processed on the heat seal layer 200, and then a groove can be further processed on the groove wall of the groove to form a thinning groove. For a specific schematic diagram, please refer to Fig.15 and Fig.16 .

[0073] To continue, please refer to Figures 2 to 8 The housing 100 includes a storage portion 600, a cover portion 700 and a sealing portion 800. The storage portion 600 is provided with a groove 500. The cover portion 700 can seal the opening of the groove 500 to form a sealed cavity to package the battery cell. The sealing portion 800 seals the housing 100 by heat sealing. The sealing portion 800 includes a heat sealing layer 200, a metal layer 300 and an outer layer 400. The other areas of the heat sealing layer 200 except the processing area 210 can belong to the sealing portion 800. In addition, please refer to Figure 7 and Fig.13 The cover body 700 can be processed with a through hole or a thinned groove (that is, two processing areas 210 are processed on the heat sealing layer 200), so as to further increase the volume of the groove 500.

[0074] Please refer to Figures 2 to 16 , the above mentioned heat sealing layer 200, metal layer 300 and outer layer 400 are formed into shell 100, and the specific way of forming groove 500 on shell 100 can be that after heat sealing layer 200, metal layer 300 and outer layer 400 are bonded to each other, shell 100 is punched to form groove 500. The wall thickness of at least one groove wall of groove 500 is equal to the sum of thickness of processing area 210, thickness of metal layer 300 and thickness of outer layer 400, which specifically means that at least one groove wall of groove 500 only includes metal layer 300 and outer layer 400. Alternatively, the wall thickness of at least one groove wall of groove 500 is equal to the sum of thickness of processing area 210, thickness of metal layer 300 and thickness of outer layer 400, that is, the groove wall of groove 500 has heat sealing layer 200, metal layer 300 and outer layer 400, but the thickness of heat sealing layer 200 is smaller. In addition, the processed area 210 may be located in the middle portion of the groove 500, and the unprocessed area 220 may be located in the edge portion of the groove 500, so that the maximum thickness of the groove wall of the groove 500 is equal to the sum of the thicknesses of the heat sealing layer 200, the metal layer 300 and the outer layer 400. Figure 8In addition, in some cases, the battery cell may directly contact the middle portion of the groove wall of the groove 500, that is, the battery cell may contact the metal layer 300, which may improve the energy density of the battery.

[0075] Further, the specific structure of the groove 500 after the housing 100 forms the groove 500 is described below. Figure 3 , Figure 4 and Fig.10 In some embodiments, the groove 500 includes two first walls 510 arranged opposite to each other, two second walls 520 arranged opposite to each other, and a third wall 530. The two first walls 510 and the two second walls 520 are connected to the third wall 530 together. In this embodiment, the shape of the groove 500 can be rectangular or square. The two first walls 510 can be located on both sides of the length direction of the groove 500, or the two first walls 510 can be located on both sides of the width direction of the groove 500. The two second walls 520 can be located on both sides of the length direction of the groove 500, or the two second walls 520 can be located on both sides of the width direction of the groove 500. The wall thickness of the third wall 530 is equal to the sum of the thickness of the processing area 210, the thickness of the metal layer 300, and the thickness of the outer layer 400, which can make the volume of the groove 500 larger and improve the energy density of the battery. Among them, when the battery cell is arranged in the shell 100, one side of the thickness direction of the battery cell can abut on the third wall 530. The area of ​​the processing area 210 is equal to the area of ​​the third wall 530 .

[0076] Furthermore, when processing the heat seal layer 200, the processing area 210 can be made larger. Figure 3 , Figure 5 and Fig.11 In some embodiments, the wall thickness of at least one first wall 510 is equal to the sum of the thickness of the processing area 210, the thickness of the metal layer 300 and the thickness of the outer layer 400, which can further expand the size of the groove 500 in the length direction or in the width direction, thereby improving the energy density of the battery.

[0077] Furthermore, the thickness of at least one first wall 510 mentioned above is equal to the sum of the thickness of the metal layer 300 and the thickness of the outer layer 400. This includes two cases. One case is that the thickness of one first wall 510 is equal to the sum of the thickness of the processing area 210, the thickness of the metal layer 300 and the thickness of the outer layer 400. The other case is that the thickness of both first walls 510 is equal to the sum of the thickness of the processing area 210, the thickness of the metal layer 300 and the thickness of the outer layer 400. Among them, the second case can further improve the energy density of the battery, that is, please refer to Figure 3 , Figure 6 and Fig.12In some embodiments, the thickness of the two first walls 510 is equal to the sum of the thickness of the processing area 210, the thickness of the metal layer 300 and the thickness of the outer layer 400. The area of ​​the processing area 210 is equal to the sum of the area of ​​the third wall 530 and the area of ​​the two first walls 510.

[0078] Further, the first wall 510 mentioned above can expand the size of the groove 500 in the length direction or in the width direction. For example, the first wall 510 can expand the size of the groove 500 in the length direction, wherein the expansion of the size of the groove 500 in the width direction can be achieved by the second wall 520. Therefore, in some embodiments, the wall thickness of at least one second wall 520 is equal to the sum of the thickness of the processing area 210, the thickness of the metal layer 300, and the thickness of the outer layer 400. Specifically, the first wall 510 can expand the size of the groove 500 in the length direction, and the second wall 520 can expand the size of the groove 500 in the width direction, thereby improving the energy density of the battery. Alternatively, the first wall 510 can expand the size of the groove 500 in the width direction, and the second wall 520 can expand the size of the groove 500 in the length direction, thereby improving the energy density of the battery.

[0079] Further, the above-mentioned thickness of at least one second wall 520 is equal to the sum of the thickness of the processing area 210, the thickness of the metal layer 300 and the thickness of the outer layer 400, which includes two cases, one case is that the thickness of one second wall 520 is equal to the sum of the thickness of the processing area 210, the thickness of the metal layer 300 and the thickness of the outer layer 400, and the other case is that the thickness of the two second walls 520 is equal to the sum of the thickness of the processing area 210, the thickness of the metal layer 300 and the thickness of the outer layer 400. Among them, the second case can further improve the energy density of the battery, that is, in some embodiments, the thickness of the two second walls 520 is equal to the sum of the thickness of the processing area 210, the thickness of the metal layer 300 and the thickness of the outer layer 400.

[0080] Further, the specific structure of the groove 500 is further introduced. In some embodiments, the groove 500 includes two first walls 510 arranged opposite to each other, two second walls 520 arranged opposite to each other, and a third wall 530, and the two first walls 510 and the two second walls 520 are connected to the third wall 530 around each other. In this embodiment, the shape of the groove 500 can be rectangular or square. The two first walls 510 can be located on both sides of the length direction of the groove 500, or the two first walls 510 can be located on both sides of the width direction of the groove 500. The two second walls 520 can be located on both sides of the length direction of the groove 500, or the two second walls 520 can be located on both sides of the width direction of the groove 500. The wall thickness of one first wall 510 is equal to the sum of the thickness of the processed area 210, the thickness of the metal layer 300, and the thickness of the outer layer 400, and the wall thickness of the other first wall 510 is equal to the sum of the thickness of the unprocessed area 220, the thickness of the metal layer 300, and the thickness of the outer layer 400. In this way, when the two first walls 510 are respectively located on both sides of the length direction of the groove 500, the wall thickness of one first wall 510 is equal to the sum of the thickness of the processed area 210, the thickness of the metal layer 300 and the thickness of the outer layer 400, and the wall thickness of the other first wall 510 is equal to the sum of the thickness of the unprocessed area 220, the thickness of the metal layer 300 and the thickness of the outer layer 400. This arrangement can effectively increase the size of the groove 500 in the length direction, thereby increasing the energy density of the battery. Alternatively, when the two first walls 510 are respectively located on both sides of the width direction of the groove 500, the wall thickness of one first wall 510 is equal to the sum of the thickness of the processed area 210, the thickness of the metal layer 300 and the thickness of the outer layer 400, and the wall thickness of the other first wall 510 is equal to the sum of the thickness of the unprocessed area 220, the thickness of the metal layer 300 and the thickness of the outer layer 400. This arrangement can effectively increase the size of the groove 500 in the width direction, thereby increasing the energy density of the battery.

[0081] Further, the specific structure of the groove 500 is further introduced. In some embodiments, the groove 500 includes two first walls 510 arranged opposite to each other, two second walls 520 arranged opposite to each other, and a third wall 530. The two first walls 510 and the two second walls 520 are connected to the third wall 530 around each other. In this embodiment, the shape of the groove 500 can be rectangular or square. The two first walls 510 can be located on both sides of the length direction of the groove 500, or the two first walls 510 can be located on both sides of the width direction of the groove 500. The two second walls 520 can be located on both sides of the length direction of the groove 500, or the two second walls 520 can be located on both sides of the width direction of the groove 500. The wall thickness of one second wall 520 is equal to the sum of the thickness of the processed area 210, the thickness of the metal layer 300, and the thickness of the outer layer 400, and the wall thickness of the other second wall 520 is equal to the sum of the thickness of the unprocessed area 220, the thickness of the metal layer 300, and the thickness of the outer layer 400. In this way, when the two second walls 520 are respectively located on both sides of the length direction of the groove 500, the wall thickness of one second wall 520 is equal to the sum of the thickness of the processed area 210, the thickness of the metal layer 300 and the thickness of the outer layer 400, and the wall thickness of the other second wall 520 is equal to the sum of the thickness of the unprocessed area 220, the thickness of the metal layer 300 and the thickness of the outer layer 400. This arrangement can effectively increase the size of the groove 500 in the length direction, thereby increasing the energy density of the battery. Alternatively, when the two second walls 520 are respectively located on both sides of the width direction of the groove 500, the wall thickness of one second wall 520 is equal to the sum of the thickness of the processed area 210, the thickness of the metal layer 300 and the thickness of the outer layer 400, and the wall thickness of the other second wall 520 is equal to the sum of the thickness of the unprocessed area 220, the thickness of the metal layer 300 and the thickness of the outer layer 400. This arrangement can effectively increase the size of the groove 500 in the width direction, thereby increasing the energy density of the battery.

[0082] In some embodiments, the shell 100 is made by any shell manufacturing method of any one of the embodiments of the first aspect. Specifically, by processing on the heat sealing layer 200, the heat sealing layer 200 has a processing area 210 and an unprocessed area 220, and the processing area 210 can be set as a through hole or a thinning groove, and then the heat sealing layer 200, the metal layer 300 and the outer layer 400 are formed into the shell 100, and after the groove 500 is formed on the shell 100, the wall thickness of at least one groove wall of the groove 500 is the sum of the thickness of the processing area 210, the thickness of the metal layer 300 and the thickness of the outer layer 400, that is, the thickness of at least one groove wall of the groove 500 is less than the thickness of the heat sealing layer 200, the thickness of the metal layer 300 and the thickness of the outer layer 400. This is because the heat sealing layer 200 is processed. In the prior art, after the heat sealing layer 200, the metal layer 300 and the outer layer 400 form the shell 100, the wall thickness of the groove 500 of the shell 100 is the sum of the thicknesses of the heat sealing layer 200, the metal layer 300 and the outer layer 400. In the present application, the heat sealing layer 200 is processed so that the thickness of at least one groove wall of the groove 500 is smaller, which can effectively increase the volume of the groove 500, so that the groove 500 can hold more capacity batteries. In this way, the shell 100 manufactured by the shell manufacturing method can effectively improve the energy density of the battery.

[0083] In some embodiments, the battery includes: a battery cell and a shell 100 of the above embodiment. The battery cell is disposed in the groove 500. Specifically, by processing on the heat sealing layer 200, the heat sealing layer 200 has a processed area 210 and an unprocessed area 220, and the processed area 210 can be set as a through hole or a thinning groove, and then the heat sealing layer 200, the metal layer 300 and the outer layer 400 are formed into the shell 100, and after the groove 500 is formed on the shell 100, the wall thickness of at least one groove wall of the groove 500 is the sum of the thickness of the processed area 210, the thickness of the metal layer 300 and the thickness of the outer layer 400, that is, the thickness of at least one groove wall of the groove 500 is less than the thickness of the heat sealing layer 200, the thickness of the metal layer 300 and the thickness of the outer layer 400. This is because the heat sealing layer 200 is processed. In the prior art, after the heat sealing layer 200, the metal layer 300 and the outer layer 400 form the shell 100, the wall thickness of the groove 500 of the shell 100 is the sum of the thickness of the heat sealing layer 200, the metal layer 300 and the outer layer 400. In the present application, the heat sealing layer 200 is processed so that the thickness of at least one groove wall of the groove 500 is small, which can effectively increase the volume of the groove 500, so that the groove 500 can place more capacity batteries. In this way, the shell 100 made by the shell manufacturing method can effectively improve the energy density of the battery. Further, the battery with the shell 100 has a higher energy density.

[0084] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A method for manufacturing a housing, characterized in that: The shell manufacturing method comprises the following steps: Processing the heat sealing layer so that the heat sealing layer has a processed area and an unprocessed area, wherein the processed area is configured as a through hole or a thinning groove; The heat-sealing layer, the metal layer and the outer layer form a shell, and a groove is formed on the shell, wherein the groove is used to accommodate the battery cell, wherein the wall thickness of at least one groove wall of the groove is equal to the sum of the thickness of the processing area, the thickness of the metal layer and the thickness of the outer layer.

2. The shell manufacturing method according to claim 1, characterized in that: The groove includes two first walls arranged opposite to each other, two second walls arranged opposite to each other and a third wall, the two first walls and the two second walls are jointly surrounded and connected to the third wall, and the wall thickness of the third wall is equal to the sum of the thickness of the processing area, the thickness of the metal layer and the thickness of the outer layer.

3. The shell manufacturing method according to claim 2, characterized in that: The wall thickness of at least one of the first walls is equal to the sum of the thickness of the processing area, the thickness of the metal layer and the thickness of the outer layer.

4. The method for manufacturing a housing according to claim 3, characterized in that: The wall thickness of the two first walls is equal to the sum of the thickness of the processing area, the thickness of the metal layer and the thickness of the outer layer.

5. The method for manufacturing a housing according to claim 3, characterized in that: The wall thickness of at least one of the second walls is equal to the sum of the thickness of the processing area, the thickness of the metal layer and the thickness of the outer layer.

6. The method for manufacturing a housing according to claim 5, characterized in that: The wall thickness of the two second walls is equal to the sum of the thickness of the processing area, the thickness of the metal layer and the thickness of the outer layer.

7. The method for manufacturing a housing according to claim 1, characterized in that: The groove includes two first walls arranged opposite to each other, two second walls arranged opposite to each other and a third wall, the two first walls and the two second walls are connected to the third wall together, the wall thickness of one of the first walls is equal to the sum of the thickness of the processed area, the thickness of the metal layer and the thickness of the outer layer, and the wall thickness of the other first wall is equal to the sum of the thickness of the unprocessed area, the thickness of the metal layer and the thickness of the outer layer.

8. The method for manufacturing a housing according to claim 7, characterized in that: The groove includes two first walls arranged opposite to each other, two second walls arranged opposite to each other and a third wall, the two first walls and the two second walls are connected to the third wall together, the wall thickness of one of the second walls is equal to the sum of the thickness of the processed area, the thickness of the metal layer and the thickness of the outer layer, and the wall thickness of the other second wall is equal to the sum of the thickness of the unprocessed area, the thickness of the metal layer and the thickness of the outer layer.

9. A housing, characterized in that The housing is manufactured by the housing manufacturing method according to any one of claims 1 to 8.

10. A battery, characterized in that include: Battery cells; The housing as claimed in claim 9, wherein the battery cell is disposed in the groove.

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