A battery and an electrical device containing the battery

Abstract

The present invention provides a battery comprising a cell and a battery case; the battery case comprises a shell wall and a cavity; the cavity is used to accommodate the cell; the shell wall is provided with a pole, the pole being composited with the shell wall via an insulating material, and the insulating material being located on the inner side of the shell wall. Compared to the prior art, the battery provided by the present invention composites the pole with the shell wall of the battery case via an insulating material, and the insulating material and the shell wall are bonded via intermolecular forces, so that the pole becomes part of the shell wall and is tightly embedded in the shell wall. This not only ensures good sealing performance between the pole and the battery case, but also has excellent insulation effect. At the same time, the pole of this structure can be made very thin, without taking up additional height space of the battery, effectively improving the height utilization rate of the battery.

Description

Technical Field

[0001] The present invention relates to the field of lithium batteries, and in particular to a battery and an electrical device containing the battery. Background Art

[0002] Existing button-type steel-cased batteries typically include a housing, a cover plate, and a battery cell. The battery cell is located within the housing, and the cover plate is located at an opening at the upper end of the housing. The cover plate is provided with a terminal post, which is electrically connected to the battery cell to provide external power. Currently, the cover plate and housing are typically sealed using a mechanical seal, achieved by deforming and riveting the cover plate and housing together. However, mechanical seals require very high dimensional accuracy of the sealing components, making the manufacturing and processing of the housing and cover plate difficult. Furthermore, the sealing reliability of mechanical seals is relatively poor, making leakage prone and potentially causing battery failure. Furthermore, conventional methods for sealing the terminal post and cover plate use a method similar to riveting, using a plastic sealing ring between the terminal post and the cover plate. Pressure is applied to the terminal post, deforming it and squeezing the sealing ring, sealing the terminal post and cover plate. However, this sealing method still has the following disadvantages: 1) Reliability is still low, with the risk of leakage; 2) the terminal post occupies a significant amount of height, increasing the thickness of the battery and resulting in a loss of energy density.

[0003] In view of this, it is indeed necessary to provide a technical solution to the above problems. Summary of the Invention

[0004] One of the purposes of the present invention is to provide a battery that solves the problem in the prior art that the terminal design has poor sealing performance and occupies a large amount of height space. The battery provided by the present invention not only has good sealing performance but also has good height utilization.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A battery comprising:

[0007] battery cells;

[0008] The battery shell comprises a shell wall and a cavity; the cavity is used to accommodate the battery cell; the shell wall is provided with a pole, the pole is composited with the shell wall through an insulating material, and the insulating material is located on the inner side of the shell wall.

[0009] Preferably, the insulating material includes at least one of polypropylene glue, fluororubber, chloroprene rubber, brominated butyl, polyethylene, polyester compound, electrolyte oxidation-proof glue, ethylene propylene rubber, butyl, and curing glue.

[0010] Preferably, the insulating material is composited onto the pole on the shell wall in a manner that includes at least one of injection molding, gluing, hot pressing, ultrasonic welding, thermal curing, and ultraviolet curing.

[0011] Preferably, the thickness of the pole is the same as the thickness of the shell wall with which it is combined, and the side of the pole facing the battery core is flush with the inner wall of the shell wall.

[0012] Preferably, the shell wall is composed of a first shell and a second shell, the first shell and the second shell are cooperatively and hermetically connected, and the pole is composited with the first shell or the second shell through the insulating material.

[0013] Preferably, the sealing connection between the first shell and the second shell includes at least one of laser welding, thermal compression welding, resistance welding, and ultrasonic welding.

[0014] Preferably, an inner boss is provided at the end of the first shell and / or the second shell, and the first shell and the second shell are sealed and connected by the inner boss.

[0015] Preferably, an external boss is provided at the end of the first shell and / or the second shell, and the first shell and the second shell are sealed and connected by the external boss.

[0016] Preferably, the first shell or the second shell is provided with a liquid injection port for injecting electrolyte.

[0017] Preferably, an insulating layer is sprayed on the inner wall of the first shell and / or the second shell at a position avoiding the insulating material and the pole.

[0018] Preferably, explosion-proof notches are provided on the shell wall or the pole.

[0019] A second object of the present invention is to provide an electrical device comprising the battery described above.

[0020] Compared with the prior art, the beneficial effect of the present invention is that the battery provided by the present invention combines the pole with the shell wall of the battery shell through an insulating material. The insulating material and the shell wall are bonded by intermolecular forces, so that the pole becomes a part of the shell wall and is tightly embedded in the shell wall. This not only ensures good sealing performance between the pole and the battery shell, but also has excellent insulation effect, avoiding the situation where the positive and negative poles contact and short circuit with the battery shell. At the same time, the thickness of the pole of this structure can be made very thin, without taking up additional height space of the battery, effectively improving the height utilization rate of the battery. Compared with the conventional design of riveting the pole to the battery shell, the pole design of the present invention effectively solves the problem of low sealing between the pole and the battery shell and the pole taking up more height space. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the structure of the battery of Example 1 of the present invention.

[0022] Figure 2 Schematic diagram of the explosion of the battery of Example 1 of the present invention.

[0023] Figure 3 This is a front schematic diagram of the cover of the battery according to Example 1 of the present invention.

[0024] Figure 4 This is a schematic diagram of the back side of the cover plate of the battery according to Example 1 of the present invention.

[0025] Figure 5 Schematic diagram of the structure of the battery of Example 2 of the present invention.

[0026] Figure 6 Schematic diagram of the structure of the battery of Example 4 of the present invention.

[0027] Figure 7 Schematic diagram of the explosion of the battery of Example 4 of the present invention.

[0028] Figure 8 This is a schematic structural diagram of the pole piece of Example 4 of the present invention.

[0029] Figure 9 This is a front view of the shell of the battery of Example 4 of the present invention.

[0030] Figure 10 This is a schematic diagram of the reverse side of the shell of the battery of Example 4 of the present invention.

[0031] Figure 11 Schematic diagram of the structure of the battery of Example 6 of the present invention.

[0032] Figure 12 This is one of the schematic diagrams of the cooperative connection between the first shell and the second shell of the present invention.

[0033] Figure 13 This is the second schematic diagram of the connection between the first shell and the second shell of the present invention.

[0034] Figure 14 This is the third schematic diagram of the connection between the first shell and the second shell of the present invention.

[0035] Figure 15 This is the fourth schematic diagram of the connection between the first shell and the second shell of the present invention.

[0036] Figure 16 This is the fifth schematic diagram of the connection between the first shell and the second shell of the present invention.

[0037] Figure 17This is the sixth schematic diagram of the connection between the first shell and the second shell of the present invention.

[0038] Figure 18 This is the seventh schematic diagram of the connection between the first shell and the second shell of the present invention.

[0039] Figure 19 This is the eighth schematic diagram of the connection between the first shell and the second shell of the present invention.

[0040] Figure 20 This is the ninth schematic diagram of the connection between the first shell and the second shell of the present invention.

[0041] Figure 21 This is the tenth schematic diagram of the connection between the first shell and the second shell of the present invention.

[0042] Figure 22 This is the eleventh schematic diagram of the connection between the first shell and the second shell of the present invention.

[0043] Figure 23 This is the twelfth schematic diagram of the connection between the first shell and the second shell of the present invention.

[0044] Figure 24 This is the thirteenth schematic diagram of the cooperative connection between the first shell and the second shell of the present invention.

[0045] Figure 25 This is the fourteenth schematic diagram of the first shell and the second shell being connected in cooperation with each other according to the present invention.

[0046] Figure 26 This is the fifteenth schematic diagram of the connection between the first shell and the second shell of the present invention.

[0047] Figure 27 This is the sixteenth schematic diagram of the cooperative connection between the first shell and the second shell of the present invention.

[0048] Figure 28 This is the seventeenth schematic diagram of the connection between the first shell and the second shell of the present invention.

[0049] Figure 29 This is the eighteenth schematic diagram of the first shell and the second shell being connected in cooperation with each other according to the present invention.

[0050] Figure 30 This is the nineteenth schematic diagram of the connection between the first shell and the second shell of the present invention.

[0051] Figure 31 This is the twentieth schematic diagram of the connection between the first shell and the second shell of the present invention.

[0052] Figure 32 This is the twenty-first schematic diagram of the connection between the first shell and the second shell of the present invention.

[0053] Figure 33 This is schematic diagram No. 22 of the connection between the first shell and the second shell of the present invention.

[0054] Figure 34 This is the twenty-third schematic diagram of the connection between the first shell and the second shell of the present invention.

[0055] In the figure: 1-battery cell; 11-positive electrode sheet; 111-positive electrode ear; 12-negative electrode sheet; 121-negative electrode ear; 13-diaphragm; 2-shell wall; 21-first shell; 22-second shell; 3-pole; 4-insulating material; 5-explosion-proof notch; 6-liquid filling port; 7-insulating layer. DETAILED DESCRIPTION

[0056] 1. A battery, comprising a cell 1 and a battery case; the battery case comprising a shell wall 2 and a cavity; the cavity being configured to accommodate the cell 1; the shell wall 2 being provided with a pole 3, the pole 3 being composited with the shell wall 2 via an insulating material 4, and the insulating material 4 being located on the inner side of the shell wall 2.

[0057] Among them, the pole 3 is mainly made of metal material, and realizes external power supply through electrical connection with the battery cell 1, and includes a positive pole and a negative pole. When the positive electrode ear 111 of the battery cell 1 is electrically connected to the pole 3, it is a positive pole, and the negative electrode ear 121 of the battery cell 1 is directly electrically connected to the other end of the battery shell; when the negative electrode ear 121 of the battery cell 1 is electrically connected to the pole 3, it is a negative pole, and the positive electrode ear 111 of the battery cell 1 is directly electrically connected to the other end of the battery shell. The pole 3 can be set on the upper wall, side wall or lower wall of the shell wall 2. In actual preparation, the pole 3 can be first composited with the battery shell and then assembled and sealed. Of course, normally, before the pole 3 is composited with the shell wall 2, a through hole matching the pole 3 should be provided on the shell wall 2 to accommodate the pole 3, and then the pole 3 is fixed by the insulating material 4.

[0058] The battery cell 1 can be manufactured by winding or lamination, and includes a positive electrode sheet 11, a negative electrode sheet 12, and a separator 13 spaced between the positive electrode sheet 11 and the negative electrode sheet 12. If the battery cell 1 is laminated, the structure of the electrode sheet and the separator 13 can be designed according to the structure of the battery cell 1. For example, when the battery cell 1 is a button battery cell 1, the electrode sheet is a circular design with a hollow foil area, and the tabs are ultrasonically welded to the hollow foil area. The positive tab can be an aluminum strip, and the negative tab can be a nickel strip, copper strip, or copper-plated nickel strip. The non-welded points of the tabs are insulated, and the insulation treatment methods include but are not limited to thermal lamination of PP glue, applying insulating tape, or coating with insulating glue.

[0059] The active material layer coated on the positive electrode sheet 11 may be, but is not limited to, a chemical formula such as Li a Nix Co y M z O 2-b N b (wherein 0.95≤a≤1.2, x>0, y≥0, z≥0, and x+y+z=1, 0≤b≤1, M is selected from a combination of one or more of Mn and Al, and N is selected from a combination of one or more of F, P, and S), the positive electrode active material may also be, but is not limited to, LiCoO2, LiNiO2, LiVO2, LiCrO2, LiMn2O4, LiCoMnO4, Li2NiMn3O8, LiNi 0.5 Mn 1.5 The positive electrode active material may be a combination of one or more of O4, LiCoPO4, LiMnPO4, LiFePO4, LiNiPO4, LiCoFSO4, CuS2, FeS2, MoS2, NiS, TiS2, etc. The positive electrode active material may also be subjected to a modification treatment. The method for modifying the positive electrode active material should be known to those skilled in the art. For example, the positive electrode active material may be modified by coating, doping, etc. The materials used for the modification treatment may include but are not limited to a combination of one or more of Al, B, P, Zr, Si, Ti, Ge, Sn, Mg, Ce, W, etc. The positive electrode current collector used in the positive electrode sheet 11 is generally a structure or part that collects current. The positive electrode current collector may be any material suitable for use as a positive electrode current collector for lithium-ion batteries in the art. For example, the positive electrode current collector may include but is not limited to metal foil, and more specifically may include but is not limited to aluminum foil.

[0060] The active material layer coated on the negative electrode sheet 12 may include, but is not limited to, one or more of graphite, soft carbon, hard carbon, carbon fiber, mesophase carbon microbeads, silicon-based materials, tin-based materials, lithium titanate, or other metals capable of forming alloys with lithium. The graphite may be selected from one or more of artificial graphite, natural graphite, and modified graphite; the silicon-based material may be selected from one or more of elemental silicon, silicon oxide compounds, silicon-carbon composites, and silicon alloys; and the tin-based material may be selected from one or more of elemental tin, tin oxide compounds, and tin alloys. The negative electrode current collector used in the negative electrode sheet 12 is typically a structure or component that collects current. The negative electrode current collector may be any material suitable for use as a negative electrode current collector in lithium-ion batteries. For example, the negative electrode current collector may include, but is not limited to, metal foil, and more specifically, may include, but is not limited to, copper foil.

[0061] The separator 13 can be made of various materials suitable for lithium-ion battery separators 13 in the art, for example, it can be a combination of one or more materials including but not limited to polyethylene, polypropylene, polyvinylidene fluoride, aramid, polyethylene terephthalate, polytetrafluoroethylene, polyacrylonitrile, polyimide, polyamide, polyester and natural fiber.

[0062] Furthermore, the insulating material 4 includes at least one of polypropylene glue, fluororubber, chloroprene rubber, butyl bromide, polyethylene, polyester compounds, electrolyte oxidation-resistant glue, ethylene propylene diene rubber, butyl rubber, and curing glue. Using a glue-based insulating material 4 not only facilitates the integration of the terminal 3 into the battery housing, but also provides insulation and improved sealing. The curing glue can specifically be a high-temperature curing glue. The insulating material 4 can also be other polymer materials with insulating properties.

[0063] Furthermore, the insulating material 4 may be laminated to the housing wall 2 using at least one of injection molding, gluing, thermal compression, ultrasonic welding, thermal curing, and ultraviolet curing. The specific lamination method may be selected based on the insulating material 4 used. For example, if a curing adhesive is used, thermal curing or other methods may be used.

[0064] Furthermore, the thickness of the terminal post 3 is the same as the thickness of the composite shell wall 2, and the side of the terminal post 3 facing the battery cell 1 is flush with the inner wall of the shell wall 2. Due to the composite design using the insulating material 4, the thickness of the terminal post 3 can be the same as the thickness of the composite shell wall 2, which is equivalent to embedding the terminal post 3 in the shell wall 2 and forming an integral part of the shell wall 2. Compared to the existing riveted terminal post 3 design, the present invention is equivalent to only adding a layer of insulating material 4 between the battery casing and the battery cell 1, which is equivalent to not increasing the height of the battery, effectively improving the battery height utilization rate, thereby increasing the battery energy density.

[0065] Furthermore, the housing wall 2 is composed of a first shell 21 and a second shell 22. The first shell 21 and the second shell 22 are sealed together, and the terminal 3 is composited with the first shell 21 or the second shell 22 via the insulating material 4. The battery housing of the present invention includes the conventional cover and shell described in the background art. The first shell 21 or the second shell 22 can be regarded as a conventional cover, and the other can be regarded as a shell. The terminal 3 of the present invention can be disposed in the cover or the shell. When disposed in the shell, it can be disposed on the side wall or bottom wall of the shell.

[0066] Furthermore, the sealing connection between the first shell 21 and the second shell 22 includes at least one of laser welding, thermal compression welding, resistance welding, and ultrasonic welding. Preferably, the two shells are sealed by laser welding. The welding points of laser welding are more solid and the sealing is better than mechanical sealing, which greatly avoids the risk of leakage. However, for different structural matching methods, the specific locations of laser welding are also different. Only laser welding at specific locations can ensure good sealing of the two shells, such as Figures 12-34 shown.

[0067] Furthermore, the ends of the first shell 21 and / or the second shell 222 are provided with inner bosses, and the first shell 21 and the second shell 22 are sealed and connected by the inner bosses. Different designs of the inner bosses can be used in different directions of laser welding. The sealing structures using the inner bosses include but are not limited to the following: Figures 12-18 As shown, specifically:

[0068] like Figures 12-14 In the structure shown, the first shell 21 and / or the second shell 22 are respectively provided with matching stepped notches, and the first shell 21 and the second shell 22 form a shell wall with a neat structure, which can also meet the requirements of the sealing connection between the two.

[0069] like Figure 15 In the structure shown, the matching portion of the first shell 21 and the second shell 22 is a bevel structure, and the laser welding direction is aligned with the bevel direction, so that the first shell 21 and the second shell 22 form a square shell wall, which can also meet the requirements of the sealed connection between the two.

[0070] like Figures 16-18 The inner boss is wrapped in the cavity, and the first shell 21 and the second shell 22 can be sealed to form a square shell wall by using a laser welding direction vertically from the top.

[0071] Furthermore, the ends of the first shell 21 and / or the second shell 22 are provided with external bosses, and the first shell 21 and the second shell 22 are sealed and connected by the external bosses. Different structural designs of the external bosses have different laser welding directions. The external boss is relative to the entire shell wall. After the first shell 21 and the second shell 22 are sealed to form a closed shell wall, there is still a boss protruding from the entire shell wall. The structural design of the external boss includes but is not limited to the following: Figures 19-34 As shown, specifically:

[0072] like Figures 19-23In the structure shown, the ends of the first shell 21 and / or the second shell 22 are respectively provided with platforms protruding from the shell wall, and the protruding direction of the platforms is parallel to the top / bottom surface. The first shell 21 and the second shell 22 are sealed and connected through the platforms protruding from the shell wall.

[0073] like Figures 24-26 In the structure shown, the ends of the first shell 21 and / or the second shell 22 are respectively provided with platforms protruding from the shell wall, and the protruding direction of the platform is perpendicular to the top / bottom surface and also vertically upward or downward. The first shell 21 and the second shell 22 are sealed and connected by the platform protruding from the shell wall.

[0074] like Figures 27-28 In the structure shown, the ends of the first shell 21 and / or the second shell 22 are respectively provided with platforms protruding from the shell wall, and the protruding direction of the platform forms an angle less than 90° with the top / bottom surface. The first shell 21 and the second shell 22 are sealed and connected through the platform protruding from the shell wall.

[0075] like Figures 28-34 As shown, the first shell 21 and / or the second shell 22 are sealed by embedding, mainly in the form of one shell covering the opening of the other shell. According to the specific structure of the embedding, the laser welding direction used is also different. After laser welding in the appropriate direction, the sealing performance of the first shell 21 and the second shell 22 is better than that of the second shell 22. Figures 19-20 The sealing of the structure shown is even better.

[0076] In addition, regardless of the above-mentioned inner boss or outer boss, the design with a stepped structure is more conducive to the matching and positioning of the two shells, avoiding the situation where the two shells are displaced during the sealing process and resulting in poor sealing, thereby having better sealing.

[0077] Furthermore, the first shell 21 or the second shell 22 is provided with an inlet 6 for injecting electrolyte. After the electrolyte is injected, it is sealed with a sealing pin. After formation, the sealing pin is removed, the air is exhausted, and then a stainless steel sheet is laser welded to the inlet to complete the sealing of the inlet 6. The electrolyte includes an organic solvent, an electrolyte lithium salt, and additives. The electrolyte lithium salt can be LiPF6 and / or LiBOB used in high-temperature electrolytes; it can also be at least one of LiBF4, LiBOB, and LiPF6 used in low-temperature electrolytes; it can also be at least one of LiBF4, LiBOB, LiPF6, and LiTFSI used in overcharge-proof electrolytes; or it can be at least one of LiClO4, LiAsF6, LiCF3SO3, and LiN(CF3SO2)2. The organic solvent can be a cyclic carbonate, including PC and EC; a chain carbonate, including DFC, DMC, or EMC; or a carboxylic acid ester, including MF, MA, EA, MP, etc. The additives include but are not limited to at least one of film-forming additives, conductive additives, flame retardant additives, overcharge prevention additives, additives for controlling the H2O and HF content in the electrolyte, additives for improving low-temperature performance, and multifunctional additives.

[0078] Furthermore, an insulating layer 7 is sprayed onto the inner wall of the first shell 21 and / or the second shell 22, away from the insulating material 4 and the terminal 3. This insulating layer 7 prevents the insulation layer of the tab from breaking and contacting the stainless steel on the cover plate, potentially causing a short circuit. Specifically, to reduce production costs, this insulating layer 7 can be provided near the tab.

[0079] Furthermore, an explosion-proof notch 5 is provided on the shell wall 2 or the pole 3. The explosion-proof notch 5 can be laser-etched into a semicircle on the surface of the shell wall or pole 3 to serve as an explosion-proof pattern. Due to the reduced strength at the explosion-proof notch 5, when the battery encounters safety issues under extreme conditions of use, a large amount of gas will be generated in the battery, causing a sharp increase in pressure inside the battery. The pressure will break through the explosion-proof notch 5 and be discharged, acting as a safety valve, preventing further thermal runaway of the battery and ensuring the safety of the battery. Specifically, the explosion-proof notch 5 can be provided on the outer wall or inner wall of the shell wall 2, or on the side of the pole 3 facing away from the battery cell 1 or the side facing the battery cell 1.

[0080] 2. An electrical device containing the battery described above

[0081] To make the technical solutions and advantages of the present invention more clear, the present invention and its beneficial effects will be described in further detail below with reference to specific implementation methods and accompanying drawings, but the implementation methods of the present invention are not limited thereto.

[0082] Example 1

[0083] like Figures 1 to 4 As shown, a battery includes a cell 1 and a battery case. The battery case includes a case wall 2 and a cavity. The cavity is used to accommodate the cell 1. The cell 1 is made by winding a positive electrode sheet 11, a separator 13, and a negative electrode sheet 12. The case wall 2 specifically includes a first shell 21 and a second shell 22. The first shell 21 serves as a cover, and the second shell 22 serves as the shell. The cover and shell are sealed together through a notch. The positive electrode post 3 is composited with the cover by an insulating material 4, which is located on the inner side of the cover.

[0084] The specific preparation method is:

[0085] 1) The positive electrode sheet 11, the separator 13 and the negative electrode sheet 12 are wound into a cylindrical core, and the positive and negative tabs 121 are respectively led out from the upper and lower end surfaces of the core.

[0086] 2) The positive and negative tabs 121 are respectively made of aluminum strip and copper nickel-plated strip, which are ultrasonically welded to the empty foil area of ​​the corresponding electrode; the non-welded points of the aluminum strip and copper nickel-plated strip are insulated, and the treatment methods include but are not limited to hot-compounding PP glue, applying insulating tape, coating insulating glue, etc.

[0087] 3) The positive electrode post (the post 3 can be made of any of aluminum, nickel, or stainless steel) is laminated with an insulating material 4 and a cover plate. A thin insulating layer 7 is spray-coated on the side of the cover plate facing the inside of the battery cell 1 (this insulating layer 7 is designed to avoid the placement of the insulating material 4 and the positive electrode post). This prevents the insulating layer 7 on the positive tab 111 from breaking and contacting the stainless steel on the cover plate, potentially causing a short circuit. A semicircle is laser-etched on the side of the positive electrode post facing away from the battery cell 1 to serve as a safety valve.

[0088] 4) The positive electrode tab 111 of the cylindrical winding core is welded to the positive electrode post by ultrasonic or laser welding, and the negative electrode tab 121 is welded to the inner bottom of the shell by resistance welding or laser welding.

[0089] 5) The open end of the shell is provided with a stepped notch, which is sealed with the cover plate by laser welding.

[0090] 6) Inject electrolyte through the liquid injection port 6 on the cover plate, seal it with a sealing nail after injection, remove the sealing nail after formation, vent, and then use laser welding to weld a stainless steel sheet on the liquid injection hole to complete the sealing of the liquid injection port 6.

[0091] 7) Complete the battery preparation.

[0092] Example 2

[0093] The difference from Example 1 is that:

[0094] like Figure 5 As shown, a battery includes a cell 1 and a battery case. The battery case includes a case wall 2 and a cavity. The cavity is used to accommodate the cell 1. The cell 1 is made by winding a positive electrode sheet 11, a separator 13, and a negative electrode sheet 12. The case wall 2 specifically includes a first shell 21 and a second shell 22. The first shell 21 serves as a cover, and the second shell 22 serves as the shell. The cover and shell are sealed together through a notch. The positive electrode post 3 is composited with the bottom wall of the shell by an insulating material 4, and the insulating material 4 is located on the inside of the shell.

[0095] Correspondingly, the composite position of the positive electrode post and the shell wall 2 changes accordingly; and when the post 3 is composited with the bottom wall of the shell, the corresponding cover plate is only a stainless steel disc without a hole design.

[0096] The rest is the same as in Example 1 and will not be described again here.

[0097] Example 3

[0098] The difference from Example 1 is that:

[0099] A battery includes a cell 1 and a battery case. The battery case includes a case wall 2 and a cavity. The cavity is used to accommodate the cell 1. The cell 1 is formed by winding a positive electrode sheet 11, a separator 13, and a negative electrode sheet 12. The case wall 2 specifically includes a first shell 21 and a second shell 22. The first shell 21 serves as a cover, and the second shell 22 serves as the shell. The cover and the shell are sealed together through a notch. The positive electrode post 3 is composited with the side wall of the shell through an insulating material 4, and the insulating material 4 is located on the inner side of the shell.

[0100] Correspondingly, the composite position of the positive electrode post and the shell wall 2 changes accordingly; and when the post 3 is composited with the side wall of the shell, the corresponding cover plate is only a stainless steel disc without a hole design.

[0101] The rest is the same as in Example 1 and will not be described again here.

[0102] Example 4

[0103] like Figures 6-10 As shown, a battery includes a cell 1 and a battery case. The battery case includes a case wall 2 and a cavity. The cavity is used to accommodate the cell 1. The cell 1 is made of a stack of positive electrode sheets 11, a separator 13, and negative electrode sheets 12. The case wall 2 specifically includes a first shell 21 and a second shell 22. The first shell 21 serves as a cover, and the second shell 22 serves as the shell. The cover and shell are sealed together through a notch. The positive electrode post 3 is composited with the bottom wall of the shell by an insulating material 4, which is located on the inside of the shell.

[0104] The specific preparation method is:

[0105] 1) The positive and negative electrode sheets 12 are punched into a fan shape, and the separator 13 is punched into a circle or bagged with the negative electrode sheet 12. The positive electrode sheet 11, the separator 13 and the negative electrode sheet 12 are stacked into a cylindrical battery cell 1 by lamination.

[0106] 2) The positive and negative tabs 121 are respectively made of aluminum strip and copper nickel-plated strip, which are ultrasonically welded to the empty foil area of ​​the corresponding electrode; the non-welded points of the aluminum strip and copper nickel-plated strip are insulated, and the treatment methods include but are not limited to hot-compounding PP glue, applying insulating tape, coating insulating glue, etc.

[0107] 3) The positive electrode post (the post 3 can be made of any of aluminum, nickel, or stainless steel) is laminated with an insulating material 4 and a cover plate. A thin insulating layer 7 is spray-coated on the side of the cover plate facing the inside of the battery cell 1 (this insulating layer 7 is designed to avoid the placement of the insulating material 4 and the positive electrode post). This prevents the insulating layer 7 on the positive tab 111 from breaking and contacting the stainless steel on the cover plate, potentially causing a short circuit. A semicircle is laser-etched on the side of the positive electrode post facing the battery cell 1 to serve as a safety valve.

[0108] 4) The positive tab 111 of the cylindrical battery cell is welded to the positive electrode post by ultrasonic or laser welding, and the negative tab 121 is welded to the inner bottom of the shell by resistance welding or laser welding.

[0109] 5) The open end of the shell is provided with a stepped notch, which is sealed with the cover plate by laser welding.

[0110] 6) Inject electrolyte through the liquid injection port 6 on the cover plate, seal it with a sealing nail after injection, remove the sealing nail after formation, vent, and then use laser welding to weld a stainless steel sheet on the liquid injection hole to complete the sealing of the liquid injection port 6.

[0111] 7) Complete the battery preparation.

[0112] Example 5

[0113] The difference from Example 4 is that:

[0114] A battery includes a cell 1 and a battery case. The battery case includes a case wall 2 and a cavity. The cavity is used to accommodate the cell 1. The cell 1 is made of a stack of positive electrode sheets 11, a separator 13, and negative electrode sheets 12. The case wall 2 specifically includes a first shell 21 and a second shell 22. The first shell 21 serves as a cover, and the second shell 22 serves as the shell. The cover and shell are sealed together via a notch. The positive electrode post 3 is composited with the side wall of the shell via an insulating material 4, which is located on the inside of the shell.

[0115] Correspondingly, the composite position of the positive electrode post and the shell wall 2 changes accordingly, and when the electrode post 3 is composited with the side wall of the shell, the corresponding cover plate is only a stainless steel disc without a hole design.

[0116] The rest is the same as in Example 4 and will not be described again here.

[0117] Example 6

[0118] The difference from Example 4 is that:

[0119] like Figure 11 As shown, a battery includes a cell 1 and a battery case. The battery case includes a case wall 2 and a cavity. The cavity is used to accommodate the cell 1. The cell 1 is made of a stack of positive electrode sheets 11, a separator 13, and negative electrode sheets 12. The case wall 2 specifically includes a first shell 21 and a second shell 22. The first shell 21 serves as a cover, and the second shell 22 serves as the shell. The cover and shell are sealed together through a notch. The positive electrode post 3 is composited with the cover by an insulating material 4, which is located on the inside of the cover.

[0120] Correspondingly, the composite position of the positive electrode post and the shell wall 2 changes accordingly, and when the post 3 is composited with the shell, the corresponding cover plate is only a stainless steel disc without a hole design.

[0121] The rest is the same as in Example 4 and will not be described again here.

[0122] Example 7

[0123] An electrical device comprising the battery described in any one of embodiments 1 to 6.

[0124] Based on the disclosure and teachings of the above description, those skilled in the art will be able to make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the above specific embodiments. Any obvious improvements, substitutions, or modifications made by those skilled in the art based on the present invention fall within the scope of protection of the present invention. In addition, although certain specific terms are used in this description, these terms are only for convenience of description and do not constitute any limitation to the present invention.

Claims

1. A battery, characterized in that: include: battery cells; A battery case comprises a shell wall and a cavity; the cavity is used to accommodate the battery cell; the shell wall is provided with a pole, the pole is composited with the shell wall by an insulating material, and the insulating material is located on the inner side of the shell wall, the thickness of the pole is the same as the thickness of the composite shell wall, the side of the pole facing the battery cell is flush with the inner wall of the shell wall, and the insulating material is located on the same inner side of the pole and the shell wall.

2. The battery according to claim 1, characterized in that The insulating material is at least one of polypropylene glue, fluororubber, chloroprene rubber, brominated butyl rubber and polyethylene.

3. The battery according to claim 2, characterized in that The insulating material is composited onto the pole on the shell wall in a manner that includes at least one of injection molding, gluing, hot pressing, ultrasonic welding, thermal curing, and ultraviolet curing.

4. The battery according to any one of claims 1 to 3, characterized in that The shell wall is composed of a first shell and a second shell. The first shell and the second shell are matched and sealed. The pole is composited with the first shell or the second shell through the insulating material.

5. The battery according to claim 4, characterized in that The sealing connection between the first shell and the second shell includes at least one of laser welding, thermal compression welding, resistance welding, and ultrasonic welding.

6. The battery according to claim 5, characterized in that An inner boss is provided at the end of the first shell and / or the second shell, and the first shell and the second shell are sealed and connected by the inner boss.

7. The battery according to claim 5, characterized in that An external boss is provided at the end of the first shell and / or the second shell, and the first shell and the second shell are sealed and connected by the external boss.

8. The battery according to any one of claims 4, characterized in that An insulating layer is sprayed on the inner wall of the first shell and / or the second shell at a position avoiding the insulating material and the pole.

9. The battery according to any one of claims 1 to 3, characterized in that Explosion-proof notches are provided on the shell wall or the pole.

10. An electrical device comprising the battery according to any one of claims 1 to 9.

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