A button cell case and a button cell

Abstract

The present invention discloses a button cell housing, which includes a positive metal end cap and a negative metal end cap. The positive metal end cap includes a first bottom cover and a first surrounding wall disposed on one side of the first bottom cover. The negative metal end cap includes a second bottom cover and a second surrounding wall disposed on one side of the second bottom cover. The positive metal end cap and the negative metal end cap are disposed opposite to each other such that the ends of the first surrounding wall and the ends of the second surrounding wall are opposite and spaced apart. A first insulating kit is provided on the first surrounding wall, and a second insulating kit is provided on the second surrounding wall. The first insulating kit and the second insulating kit are connected at the joint surface to form an integral insulating housing. The integral structure of the insulating housing and the positive metal end cap and the negative metal end cap form a receiving cavity for accommodating the battery cell. The button cell housing of the present invention has a simple structure and is easy to implement. The insulating housing improves the energy density of the button cell, ensures good insulation of the button cell housing, and improves the processing reliability.

Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and relates to a button battery case and a button battery. Background Art

[0002] With the rapid development of electronic technology and the information industry, a large number of portable power sources are needed in people's production and life. As an electrochemical energy storage system, lithium-ion batteries have become an indispensable important technology in the development and utilization of new energy due to their very prominent advantages. Rechargeable lithium-ion batteries have been widely studied and applied due to their high energy density, long cycle life, and environmentally friendly characteristics.

[0003] The button batteries disclosed in the prior art (see the physical photo Figure 5 ) are basically two upper and lower steel shell sleeves, with an insulating rubber ring sandwiched in the middle, and are sealed by clamping. For example, CN210744008U discloses a button battery, including a case, a cover plate, a positive electrode assembly, a negative electrode assembly, and a separator. The cover plate is disposed on the case, and a sealing ring is disposed between the cover plate and the case, and one end of the sealing ring close to the bottom of the case extends in the direction of the bottom; the positive electrode assembly, the separator, and the negative electrode assembly are stacked inside the case, and the positive electrode assembly is attached to the bottom of the case, and the negative electrode assembly is attached to the cover plate; the positive electrode assembly includes a positive electrode ring and a positive electrode sheet, the positive electrode ring is sleeved on the periphery of the positive electrode sheet, and a pressing plate is fixed on the side of the positive electrode ring away from the positive electrode sheet, the pressing plate is located between the sealing ring and the bottom, and the side of the pressing plate close to the sealing ring abuts against the sealing ring. Another example is that CN110752401A discloses a button battery, which includes a conductive case, an insulating gasket, a wound core, and an electrolyte. The conductive case is divided into an upper case and a lower case, and a sealing ring is disposed between the upper case and the lower case; insulating gaskets are disposed between the wound core and the upper case and the lower case. The wound core includes a positive electrode sheet, a separator, and a negative electrode sheet. The separator is disposed between the positive electrode sheet and the negative electrode sheet. The insulating gasket is sleeved on the separator. The positive electrode tab of the positive electrode sheet or the negative electrode tab of the negative electrode sheet extends out from the gap of the insulating gasket and is in contact connection with the lower case or the upper case respectively. However, the use of a metal material for the external case of the button battery has disadvantages such as heavy weight, high processing cost, and relatively low specific energy. In addition, the metal case may also expand and explode due to factors such as the failure of the external protection board, improper overcharging or over-discharging, high-temperature environment, and internal short circuit, which raises concerns about safety. Moreover, an insulating layer needs to be added between the two upper and lower steel shell sleeves. The damage of the insulating layer during the encapsulation process is likely to cause the button battery to short-circuit or even fail.

[0004] Therefore, how to reduce weight, lower cost, and improve the safety in use is actually a problem that relevant industries want to solve. Summary of the Invention

[0005] Aiming at the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a button battery case and a button battery. Using the button battery case of the present invention in the preparation of button batteries shows the advantages of high energy density and high-rate discharge, and can achieve efficient mechanized manufacturing.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] In the first aspect, the present invention provides a button battery case, a positive metal end cap and a negative metal end cap. The positive metal end cap includes a first bottom cover and a first surrounding wall surrounding one side of the first bottom cover. The negative metal end cap includes a second bottom cover and a second surrounding wall surrounding one side of the second bottom cover;

[0008] The positive metal end cap and the negative metal end cap are arranged opposite to each other so that the ends of the first surrounding wall and the ends of the second surrounding wall are opposite and spaced apart. A first insulating kit is arranged on the first surrounding wall, and a second insulating kit is arranged on the second surrounding wall. The first insulating kit and the second insulating kit are connected at the joint surface to form an integral insulating shell. The insulating shell and the positive metal end cap and the negative metal end cap form a receiving cavity for accommodating the battery cell.

[0009] In the present invention, the statement that "the ends of the first surrounding wall and the ends of the second surrounding wall are opposite and spaced apart" means that the ends of the first surrounding wall and the ends of the second surrounding wall are arranged opposite to each other, and there is a gap between the ends of the first surrounding wall and the ends of the second surrounding wall without direct contact.

[0010] In the button battery case of the present invention, the positive metal end cap is used to connect to the positive electrode of the battery cell, and the negative metal end cap is used to connect to the negative electrode of the battery cell. The button battery case of the present invention has a simple structure and is easy to implement. The insulating shell improves the energy density of the button battery (such as a lithium-ion button battery), ensures good insulation of the button battery case, and improves the processing reliability.

[0011] As a preferred technical solution of the button battery case of the present invention, the first surrounding wall includes a coaxial first annular wall and a second annular wall connected in sequence along the direction away from the first bottom cover, and the diameter of the second annular wall is larger than that of the first annular wall.

[0012] Preferably, the connection surface between the first annular wall and the second annular wall is parallel to the first bottom cover.

[0013] Preferably, the height of the first annular wall is m, where m is 0.3 to 3 mm, such as 0.3 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.7 mm, 2 mm, 2.5 mm or 3 mm, etc., and preferably 0.7 to 1.5 mm.

[0014] Preferably, the second surrounding wall includes a coaxially arranged third annular wall and a fourth annular wall connected in sequence along the direction away from the second bottom cover, and the diameter of the fourth annular wall is greater than that of the third annular wall;

[0015] Preferably, the connection surface between the third annular wall and the fourth annular wall is parallel to the second bottom cover;

[0016] Preferably, the height of the third annular wall is n, where n is 0.3 to 3 mm, such as 0.3 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.7 mm, 2 mm, 2.5 mm or 3 mm, etc., and preferably 0.7 to 1.5 mm.

[0017] Preferably, the first insulating kit is arranged on the inner side, outer side and end surface of the first surrounding wall.

[0018] Preferably, the second insulating kit is arranged on the inner side, outer side and end surface of the second surrounding wall.

[0019] Preferably, the thicknesses of the first surrounding wall and the second surrounding wall are independently 0.1 to 0.3 mm, such as 0.1 mm, 0.2 mm or 0.3 mm, etc.

[0020] Preferably, the thicknesses of the parts of the first insulating kit arranged on the inner side and outer side of the first surrounding wall are independently 0.1 to 5 mm, such as 0.1 mm, 0.2 mm, 0.3 mm, 0.5 mm, 0.6 mm, 0.8 mm, 1 mm, 1.5 mm, 1.7 mm, 2 mm, 2.5 mm, 3 mm, 3.2 mm, 3.5 mm, 4 mm or 5 mm, etc., and preferably 0.2 to 0.8 mm.

[0021] Preferably, the thicknesses of the parts of the second insulating kit arranged on the inner side and outer side of the second surrounding wall are independently 0.1 to 5 mm, such as 0.1 mm, 0.2 mm, 0.3 mm, 0.5 mm, 0.6 mm, 0.8 mm, 1 mm, 1.5 mm, 1.7 mm, 2 mm, 2.5 mm, 3 mm, 3.2 mm, 3.5 mm, 4 mm or 5 mm, etc., and preferably 0.2 to 0.8 mm.

[0022] As a preferred technical solution of the button battery case described in the present invention, the part of the first insulating kit disposed inside the first surrounding wall abuts against the joint surface of the first annular wall and the second annular wall, and the part of the first insulating kit disposed outside the first surrounding wall abuts against the outside of the first annular wall.

[0023] Preferably, the part of the first insulating kit disposed inside the first surrounding wall is flush with the inner diameter annular surface of the first annular wall.

[0024] Preferably, the part of the second insulating kit disposed inside the second surrounding wall abuts against the joint surface of the third annular wall and the second annular wall, and the part of the second insulating kit disposed outside the second surrounding wall abuts against the outside of the third annular wall.

[0025] Preferably, the part of the second insulating kit disposed inside the second surrounding wall is flush with the inner diameter annular surface of the third annular wall.

[0026] The present invention does not limit the method of disposing the first kit on the first surrounding wall and the method of disposing the second kit on the second surrounding wall. Those skilled in the art can prepare them with reference to the methods disclosed in the prior art, as long as good bonding and sealing performance can be ensured.

[0027] Exemplary but non-limiting, the method of disposing the first insulating kit on the first surrounding wall may include injection molding; similarly, the method of disposing the second insulating kit on the second surrounding wall may include injection molding.

[0028] Preferably, the connection method of the first insulating kit and the second insulating kit includes at least one of hot melting, ultrasonic welding, welding, and bonding. However, it is not limited to the above-listed methods, and other methods that can achieve good connection and sealing effects are also applicable to the present invention.

[0029] Preferably, the welding includes at least one of laser welding, ultrasonic welding, induction welding, and vibration welding.

[0030] Preferably, the bonding includes joining with glue.

[0031] Preferably, the mating surfaces of the first insulating kit and the second insulating kit are mutually matching inclined surfaces.

[0032] Preferably, the materials of the positive metal end cap and the negative metal end cap include but are not limited to at least one of aluminum, iron, and stainless steel, and other commonly used metal shell materials in the art can also be used in the present invention.

[0033] In the present invention, the materials of the positive metal end cap and the negative metal end cap may be the same or different.

[0034] Preferably, the materials of the first insulation kit and the second insulation kit independently include at least one of polymer materials, preferably including but not limited to at least one of polyethylene (PE), polypropylene (PP), polyvinyl chloride, polystyrene, acrylonitrile-butadiene-styrene copolymer, polyoxymethylene, polycarbonate, polymethyl methacrylate, and styrene-acrylonitrile copolymer, and more preferably at least one of polypropylene and polyethylene. The polymer material can naturally soften at a certain temperature (for example, PP and / or PE plastics naturally soften at about 150 °C), causing the upper and lower shell structures of the button cell housing to expand and separate, slowly deflating to maintain safety and improving the safety of the battery.

[0035] Preferably, by setting the first insulation kit and the second insulation kit to different colors, the positive electrode side and the negative electrode side can be distinguished.

[0036] In a second aspect, the present invention provides a button cell, which includes the button cell housing described in the first aspect and an electric core located inside the accommodation cavity of the button cell housing.

[0037] The present invention does not limit the specific type of the button cell. For example, it can be a lithium-ion button cell. The lithium-ion button cell can be a liquid button cell, a semi-solid button cell, or a solid-state button cell.

[0038] The present invention does not limit the shape of the button cell. It can be a cylinder, and the cylinder can be at least one of a cylinder, a regular polygon cylinder, or a cylinder with an irregular cross-section.

[0039] The present invention does not limit the diameter-to-height ratio of the button cell. Those skilled in the art can adjust it according to actual needs, which can be greater than 1, equal to 1, or less than 1.

[0040] The present invention does not limit the specific type of the electric core in the button cell. For example, it can be a wound electric core, a stacked electric core, or an electric core manufactured by other processes.

[0041] Preferably, for a wound electric core, the axis of the electric core is perpendicular to the first bottom cover and the second bottom cover.

[0042] Preferably, for a stacked electric core, the stacking surface of the electric core is parallel to the first bottom cover and the second bottom cover.

[0043] The present invention does not limit the specific structure and composition of the electric core. For example, the electric core includes a positive electrode, a negative electrode, and a separator, and the separator is located between the positive electrode and the negative electrode.

[0044] The present invention does not limit the type of the positive electrode active material in the positive electrode, including but not limited to at least one of lithium cobaltate, lithium manganate, lithium iron phosphate, lithium manganese phosphate, nickel cobalt manganese ternary material, and nickel cobalt aluminum ternary material. Other commonly used positive electrode active materials in the art can also be used in the present invention.

[0045] The present invention does not limit the structure of the positive electrode active material. For example, it can be a metal oxide in a layered structure, a spinel structure, or an olivine structure system.

[0046] Preferably, the negative electrode active material in the negative electrode includes but not limited to at least one of lithium titanate, titanium dioxide, natural graphite, artificial graphite, carbon fiber, soft carbon, hard carbon, mesophase carbon microspheres, elemental silicon, silicon oxide compounds, and silicon-carbon composites. Other commonly used negative electrode active materials in the art can also be used in the present invention.

[0047] Preferably, the separator includes but not limited to at least one of polypropylene, polyethylene, and a ceramic separator coated with aluminum oxide. Other commonly used separators in the art can also be used in the present invention.

[0048] Preferably, the accommodating cavity further contains an electrolyte.

[0049] The present invention also provides a preparation method of the above-mentioned button cell, and the method includes the following steps: relatively arranging a positive electrode metal end cover with a first insulating kit and a negative electrode metal end cover with a second insulating kit and respectively sleeving them outside the battery cell, and connecting the joint surfaces of the first insulating kit and the second insulating kit to combine the two to obtain a button cell.

[0050] Compared with the prior art, the present invention has the following beneficial effects:

[0051] 1. The present invention provides a button cell housing with an insulating housing and a button cell. Through the setting of the insulating housing, the overall weight and cost can be reduced, and by changing the thickness of the insulation and / or changing the connection position relationship between the insulating housing and the positive electrode metal end cover and the negative electrode metal end cover, the size of the accommodating space can be increased, thereby improving the volume energy density and prolonging the endurance of the button cell.

[0052] 2. The present invention innovatively provides a button cell housing with metal end covers (i.e., a positive electrode metal end cover and a negative electrode metal end cover) and an insulating housing, ensuring good end face conductivity, mechanical and thermal stability of the button cell, and comprehensively improving the safety of the lithium-ion button cell.

[0053] 3. The lithium-ion button battery provided by the present invention has the advantages of controllable structure, simple design and low cost. The number of housing components is reduced from 3 in the prior art to 2. The button battery housing can be obtained only by sealing means such as welding or heat melting. The production difficulty is reduced, the required machining accuracy of the housing is reduced, the machining reliability is improved, and the symmetry of the product is better. The button battery housing of the present invention is easy to be commercialized. Description of the Drawings

[0054] Figure 1 Front elevation sectional view of the button battery of Example 1;

[0055] Figure 2 Top view of the button battery of Example 1;

[0056] Figure 3 Front view of the button battery of Example 1;

[0057] Figure 4 Front elevation sectional view of the positive electrode metal end cap with the first insulation kit of Example 1;

[0058] Figure 5 Front elevation sectional view of the negative electrode metal end cap with the second insulation kit of Example 1;

[0059] Wherein, 1 - positive electrode metal end cap, 11 - first bottom cover, 12 - first surrounding wall, 121 - first annular wall, 122 - second annular wall, 2 - negative electrode metal end cap, 21 - second bottom cover, 22 - second surrounding wall, 221 - third annular wall, 222 - fourth annular wall, 3 - first insulation kit, 4 - second insulation kit, 5 - insulation housing, 6 - accommodation cavity, 7 - pockmarks. Detailed Description of the Embodiments

[0060] It should be understood that in the description of the present invention, the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "side", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 construed as a limitation to the present invention.

[0061] It should be noted that in the description of the present invention, unless otherwise clearly specified and defined, the terms "arranged", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0062] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific embodiments.

[0063] The following are further examples to illustrate the present invention in detail. The examples described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the protection scope of the present invention. The specific process parameters and the like in the following examples are only examples within a suitable range, that is, those skilled in the art can make selections within a suitable range according to the description herein, rather than being limited to the specific selections in the following examples.

[0064] In a specific embodiment, the present invention provides a button cell housing (see the front elevation sectional view Figure 1 ), the button cell housing includes a positive metal end cap 1 and a negative metal end cap 2, the positive metal end cap 1 includes a first bottom cover 11 and a first surrounding wall 12 surrounding one side of the first bottom cover 11, and the negative metal end cap 2 includes a second bottom cover 21 and a second surrounding wall 22 surrounding one side of the second bottom cover 21; the positive metal end cap 1 and the negative metal end cap 2 are arranged opposite to each other so that the end of the first surrounding wall 12 and the end of the second surrounding wall 22 are opposite and spaced apart, a first insulating kit 3 is arranged on the first surrounding wall 12, a second insulating kit 4 is arranged on the second surrounding wall 22, and the first insulating kit 3 and the second insulating kit 4 are connected at the joint surface to form an integral insulating housing 5, and the insulating housing 5 and the positive metal end cap 4 and the negative metal end cap 2 form a receiving cavity 6 for accommodating the battery cell.

[0065] The first surrounding wall 12 includes a coaxial first annular wall 121 and a second annular wall 122 connected in sequence along the direction away from the first bottom cover 11, and the diameter of the second annular wall 122 is larger than that of the first annular wall 121;

[0066] The second surrounding wall 22 includes a coaxial third annular wall 221 and a fourth annular wall 222 connected in sequence along the direction away from the second bottom cover 21, and the diameter of the fourth annular wall 222 is larger than that of the third annular wall 221;

[0067] The first insulating kit 3 is arranged on the inner side, outer side and end surface of the first surrounding wall 12;

[0068] The second insulating kit 4 is disposed on the inner side, outer side and end surface of the second surrounding wall 22;

[0069] The portion of the first insulating kit 3 disposed on the inner side of the first surrounding wall 12 abuts against the joint surface of the first annular wall 121 and the second annular wall 122, and the portion of the first insulating kit 3 disposed on the outer side of the first surrounding wall 12 abuts against the outer side of the first annular wall 121.

[0070] The portion of the second insulating kit 4 disposed on the inner side of the second surrounding wall 22 abuts against the joint surface of the third annular wall 221 and the second annular wall 222, and the portion of the second insulating kit 4 disposed on the outer side of the second surrounding wall 22 abuts against the outer side of the third annular wall 221.

[0071] In one embodiment, the joint surface of the first annular wall 121 and the second annular wall 122 is parallel to the first bottom cover 11.

[0072] In one embodiment, the joint surface of the third annular wall 221 and the fourth annular wall 222 is parallel to the second bottom cover 21.

[0073] In one embodiment, the portion of the first insulating kit 3 disposed on the inner side of the first surrounding wall 12 is consistent with the inner diameter annular surface of the first annular wall 121.

[0074] In one embodiment, the portion of the second insulating kit 4 disposed on the inner side of the second surrounding wall 22 is consistent with the inner diameter annular surface of the third annular wall 221.

[0075] In one embodiment, the method for disposing the first insulating kit 3 on the first surrounding wall 12 is injection molding.

[0076] In one embodiment, the method for disposing the second insulating kit 4 on the second surrounding wall 22 is injection molding.

[0077] In one embodiment, the connection manner of the first insulating kit and the second insulating kit includes at least one of hot melting, ultrasonic welding, welding and bonding. The welding includes at least one of laser welding, ultrasonic welding, induction welding and vibration welding, and the bonding includes joining with glue.

[0078] In one embodiment, the joint surfaces of the first insulating kit 3 and the second insulating kit 4 are mutually matching inclined surfaces.

[0079] In one embodiment, the materials of the positive metal end cover 1 and the negative metal end cover 2 independently include at least one of aluminum, iron and stainless steel. The materials of the positive metal end cover 1 and the negative metal end cover 2 are the same or different.

[0080] In one embodiment, the materials of the first insulating kit 3 and the second insulating kit 4 independently include at least one of polymer materials, preferably including at least one of polyethylene, polypropylene, polyvinyl chloride, polystyrene, acrylonitrile-butadiene-styrene copolymer, polyoxymethylene, polycarbonate, polymethyl methacrylate, and styrene-acrylonitrile copolymer, and more preferably at least one of polypropylene and polyethylene.

[0081] In one embodiment, by setting the first insulating kit 3 and the second insulating kit 4 to different colors, the positive electrode side and the negative electrode side are distinguished.

[0082] Further, the height of the first annular wall 121 is m, where m is 0.3 to 3 mm, preferably 0.7 to 1.5 mm.

[0083] Further, the height of the third annular wall 221 is n, where n is 0.3 to 3 mm, preferably 0.7 to 1.5 mm.

[0084] Further, the thicknesses of the first surrounding wall 12 and the second surrounding wall 22 are independently 0.1 to 0.3 mm.

[0085] Further, the thicknesses of the portions of the first insulating kit 3 disposed inside and outside the first surrounding wall 12 are independently 0.1 to 5 mm, preferably 0.2 to 0.8 mm.

[0086] Further, the thicknesses of the portions of the second insulating kit 4 disposed inside and outside the second surrounding wall 22 are independently 0.1 to 5 mm, preferably 0.2 to 0.8 mm.

[0087] In a specific embodiment, the present invention provides a button cell, which includes the above-mentioned button cell housing and an electric core located inside the accommodating cavity of the button cell housing.

[0088] In one embodiment, the button cell is a lithium-ion button cell, which can be a liquid button cell, a semi-solid button cell, or a full-solid button cell.

[0089] In one embodiment, the diameter-height ratio of the button cell is greater than 1, equal to 1, or less than 1.

[0090] In one embodiment, the electric core is a wound electric core and / or a stacked electric core.

[0091] In one embodiment, the electric core includes a positive electrode, a negative electrode, and a separator, and the separator is located between the positive electrode and the negative electrode.

[0092] In one embodiment, the positive electrode includes a positive electrode material layer, the positive electrode material layer includes a positive electrode active material, a conductive agent, and a binder, the positive electrode active material includes at least one of lithium cobaltate, lithium manganate, lithium iron phosphate, lithium manganese phosphate, nickel cobalt manganese, and nickel cobalt aluminum ternary materials; the conductive agent includes acetylene black; the binder includes polyvinylidene fluoride.

[0093] In one embodiment, the negative electrode includes a negative electrode material layer, the negative electrode material layer includes a negative electrode active material and a binder; the binder includes polyvinylidene fluoride and / or styrene-butadiene rubber.

[0094] In one embodiment, the negative electrode active material includes at least one of lithium titanate, titanium dioxide, natural graphite, artificial graphite, carbon fiber, soft carbon, hard carbon, mesocarbon microbeads, elemental silicon, silicon oxide, and silicon-carbon composite.

[0095] In one embodiment, the separator includes at least one of polypropylene, polyethylene, and a ceramic separator coated with aluminum oxide.

[0096] Example 1

[0097] This embodiment provides a button cell housing (for its front elevation sectional view, see Figure 1 , for its top view, see Figure 2 , for its front view, see Figure 3 ), the button cell housing includes a positive electrode metal end cap 1 and a negative electrode metal end cap 2, the positive electrode metal end cap 1 includes a first bottom cover 11 and a first surrounding wall 12 surrounding one side of the first bottom cover 11, the negative electrode metal end cap 2 includes a second bottom cover 21 and a second surrounding wall 22 surrounding one side of the second bottom cover 21;

[0098] The positive electrode metal end cap 1 and the negative electrode metal end cap 2 are oppositely arranged so that the ends of the first surrounding wall 12 and the ends of the second surrounding wall 22 are opposite and spaced apart, a first insulating kit 3 is injection-molded on the first surrounding wall 12 (see Figure 4 ), a second insulating kit 4 is injection-molded on the second surrounding wall 22 (see Figure 5 ), the mating surfaces of the first insulating kit 3 and the second insulating kit 4 are inclined surfaces that cooperate with each other, and the two are laser-welded at this inclined surface to form an integral insulating housing 5, and the insulating housing 5 and the positive electrode metal end cap 1 and the negative electrode metal end cap 2 form a receiving cavity 6 for accommodating the battery cell;

[0099] The first surrounding wall 12 includes a coaxial first annular wall 121 and a second annular wall 122 connected in sequence along the direction away from the first bottom cover 11, the diameter of the second annular wall 122 is larger than the diameter of the first annular wall 121, and the connection surface of the first annular wall 121 and the second annular wall 122 is parallel to the first bottom cover 11;

[0100] The second surrounding wall 22 includes a coaxial third annular wall 221 and a fourth annular wall 222 that are sequentially connected in a direction away from the second bottom cover 21. The diameter of the fourth annular wall 222 is greater than that of the third annular wall 221. The connection surface between the third annular wall 221 and the fourth annular wall 222 is parallel to the second bottom cover 21;

[0101] The first insulating kit 3 is disposed on the inner side, outer side, and end surface of the first surrounding wall 12. The portion of the first insulating kit 3 disposed on the inner side of the first surrounding wall 12 abuts against the connection surface between the first annular wall 121 and the second annular wall 122 and is consistent with the inner diameter toroidal surface of the first annular wall 121. The portion of the first insulating kit 3 disposed on the outer side of the first surrounding wall 12 abuts against the outer side of the first annular wall 121;

[0102] The second insulating kit 4 is disposed on the inner side, outer side, and end surface of the second surrounding wall 22. The portion of the second insulating kit 4 disposed on the inner side of the second surrounding wall 22 abuts against the connection surface between the third annular wall 221 and the second annular wall 222 and is consistent with the inner diameter toroidal surface of the third annular wall 221. The portion of the second insulating kit 221 disposed on the outer side of the second surrounding wall 22 abuts against the outer side of the third annular wall 221;

[0103] The outer surface of the negative metal end cover 2 is provided with two circles of dimples 7. The diameter of the circumference where the inner circle of dimples 7 is located is 8 mm, and the diameter of the circumference where the outer circle of dimples 7 is located is 9 mm. The dimples 7 are evenly distributed in the circumferential direction, and the depth of the dimple pattern is 0.02 mm.

[0104] In this embodiment, the materials of the positive metal end cover 1 and the negative metal end cover 2 are both stainless steel. The material of the first insulating kit 3 is a mixture of PE plastic and elastomer in a mass ratio of 8:2, and the color is white. The material of the second insulating kit 4 is a mixture of PP plastic and elastomer in a mass ratio of 8:2, and the color is black. The outer diameters of the first bottom cover 11 and the second bottom cover 21 are both 10.9 mm. The inner diameters of the first annular wall 121 and the third annular wall 221 are both 10.6 mm. The heights of the first annular wall 121 and the third annular wall 221 are both 0.8 mm. The thicknesses of the portions of the first insulating kit 3 located on the inner side and the outer side of the first surrounding wall 11 are both 0.29 mm. The thicknesses of the portions of the second insulating sleeve 4 located on the inner side and the outer side of the second surrounding wall 21 are both 0.29 mm. The thicknesses of the first surrounding wall 12 and the second surrounding wall 21 are both 0.15 mm. The distance between the outer surfaces of the positive metal end cover 1 and the negative metal end cover 2 is 5.3 mm.

[0105] This embodiment provides a button cell, which is a cylindrical lithium-ion button cell with a diameter-to-height ratio greater than 1. It includes the above-mentioned button cell housing and a battery core located in the accommodation cavity 6 of the button cell housing. The battery core is a wound battery, including a positive electrode, a negative electrode, and a separator. The positive electrode is welded to the first bottom cover 11, and the negative electrode is welded to the second bottom cover 21.

[0106] Embodiment 2

[0107] This embodiment provides a button cell housing (for its front elevation sectional view, see Figure 1 , for its top view, see Figure 2 , for its front view, see Figure 3 ). The button cell housing includes a positive electrode metal end cap 1 and a negative electrode metal end cap 2. The positive electrode metal end cap 1 includes a first bottom cover 11 and a first surrounding wall 12 surrounding one side of the first bottom cover 11. The negative electrode metal end cap 2 includes a second bottom cover 21 and a second surrounding wall 22 surrounding one side of the second bottom cover 21.

[0108] The positive electrode metal end cap 1 and the negative electrode metal end cap 2 are arranged oppositely so that the ends of the first surrounding wall 12 and the ends of the second surrounding wall 22 are opposite and spaced apart. A first insulating kit 3 is injection-molded on the first surrounding wall 12 (see Figure 4 ), and a second insulating kit 4 is injection-molded on the second surrounding wall 22 (see Figure 5 ). The mating surfaces of the first insulating kit 3 and the second insulating kit 4 are inclined surfaces that cooperate with each other, and the two are joined with glue at this inclined surface to form an integral insulating housing 5. The insulating housing 5 and the positive electrode metal end cap 1 and the negative electrode metal end cap 2 form an accommodation cavity 6 for accommodating the battery core.

[0109] The first surrounding wall 12 includes a coaxial first annular wall 121 and a second annular wall 122 connected in sequence along the direction away from the first bottom cover 11. The diameter of the second annular wall 122 is greater than that of the first annular wall 121, and the connection surface of the first annular wall 121 and the second annular wall 122 is parallel to the first bottom cover 11.

[0110] The second surrounding wall 22 includes a coaxial third annular wall 221 and a fourth annular wall 222 connected in sequence along the direction away from the second bottom cover 21. The diameter of the fourth annular wall 222 is greater than that of the third annular wall 221, and the connection surface of the third annular wall 221 and the fourth annular wall 222 is parallel to the second bottom cover 21.

[0111] The first insulating kit 3 is disposed on the inner, outer, and end surfaces of the first surrounding wall 12. The portion of the first insulating kit 3 disposed on the inner side of the first surrounding wall 12 abuts against the joint surface of the first annular wall 121 and the second annular wall 122 and is consistent with the inner diameter annular surface of the first annular wall 121. The portion of the first insulating kit 3 disposed on the outer side of the first surrounding wall 12 abuts against the outer side of the first annular wall 121;

[0112] The second insulating kit 4 is disposed on the inner, outer, and end surfaces of the second surrounding wall 22. The portion of the second insulating kit 4 disposed on the inner side of the second surrounding wall 22 abuts against the joint surface of the third annular wall 221 and the second annular wall 222 and is consistent with the inner diameter annular surface of the third annular wall 221. The portion of the second insulating kit 221 disposed on the outer side of the second surrounding wall 22 abuts against the outer side of the third annular wall 221.

[0113] In this embodiment, the materials of the positive metal end cap 1 and the negative metal end cap 2 are both aluminum, and the materials of the first insulating kit 3 and the second insulating kit 4 are both PP plastics. The outer diameters of the first bottom cover 11 and the second bottom cover 21 are both 10.9 mm, the inner diameters of the first annular wall 121 and the third annular wall 221 are both 10.6 mm, the height of the first annular wall 121 is 0.8 mm, the height of the third annular wall 221 is 0.7 mm, the thicknesses of the portions of the first insulating kit 3 located on the inner and outer sides of the first surrounding wall 11 are both 0.32 mm, the thicknesses of the portions of the second insulating sleeve 4 located on the inner and outer sides of the second surrounding wall 21 are both 0.32 mm, the thicknesses of the first surrounding wall 12 and the second surrounding wall 21 are both 0.2 mm, and the distance between the outer surfaces of the positive metal end cap 1 and the negative metal end cap 2 is 5.5 mm.

[0114] This embodiment provides a button cell, which is a cubic lithium-ion button cell with an aspect ratio of less than 1, and includes the above-mentioned button cell housing and a battery core located in the accommodation cavity 6 of the above-mentioned button cell housing. The battery core is a stacked battery, including a positive electrode, a negative electrode, and a separator. The positive electrode is welded to the first bottom cover 11, and the negative electrode is welded to the second bottom cover 21.

[0115] The above content is only a typical embodiment of the present invention, and it is easy to make many other changes without exceeding the accurate scope described in the claims of the present invention.

[0116] The applicant declares that the present invention uses the above embodiments to illustrate the detailed method of the present invention, but the present invention is not limited to the above detailed method, that is, it does not mean that the present invention must rely on the above detailed method to be implemented. Those skilled in the art should understand that any improvement of the present invention, the equivalent replacement of each component of the present invention, and the selection of specific methods, etc., all fall within the protection scope and the disclosure scope of the present invention.

Claims

1. A button cell casing, characterized in that, The button cell housing includes a positive metal end cap and a negative metal end cap. The positive metal end cap includes a first bottom cover and a first surrounding wall surrounding one side of the first bottom cover. The negative metal end cap includes a second bottom cover and a second surrounding wall surrounding one side of the second bottom cover; The positive metal end cap and the negative metal end cap are arranged oppositely so that the ends of the first surrounding wall and the ends of the second surrounding wall are opposite and spaced apart. A first insulating kit is provided on the first surrounding wall, and a second insulating kit is provided on the second surrounding wall. The first insulating kit and the second insulating kit are connected at the joint surface to form an integral insulating housing. The insulating housing and the positive metal end cap and the negative metal end cap form a receiving cavity for accommodating the battery cell; The first surrounding wall includes a coaxial first annular wall and a second annular wall connected in sequence along the direction away from the first bottom cover. The diameter of the second annular wall is larger than that of the first annular wall; the connection surface between the first annular wall and the second annular wall is parallel to the first bottom cover; The second surrounding wall includes a coaxial third annular wall and a fourth annular wall connected in sequence along the direction away from the second bottom cover. The diameter of the fourth annular wall is larger than that of the third annular wall; the connection surface between the third annular wall and the fourth annular wall is parallel to the second bottom cover; The first insulating kit is provided on the inner side, outer side and end surface of the first surrounding wall; the second insulating kit is provided on the inner side, outer side and end surface of the second surrounding wall; The joint surfaces of the first insulating kit and the second insulating kit are mutually matching inclined surfaces.

2. The button cell casing according to claim 1, wherein The height of the first annular wall is m, and m is 0.3 to 3 mm.

3. The button cell casing according to claim 2, characterized in that, The m is 0.7 to 1.5 mm.

4. The button cell casing according to claim 1, characterized in that The height of the third annular wall is n, and n is 0.3 to 3 mm.

5. The button cell housing according to claim 4, characterized in that, The n is 0.7 to 1.5 mm.

6. The button cell casing according to claim 1, wherein, The thicknesses of the first surrounding wall and the second surrounding wall are independently 0.1 to 0.3 mm.

7. The button cell casing according to claim 1, characterized in that, The thicknesses of the parts of the first insulating kit provided on the inner side and the outer side of the first surrounding wall are independently 0.1 to 5 mm.

8. The button cell casing according to claim 7, characterized in that, The thicknesses of the parts of the first insulating kit provided on the inner side and the outer side of the first surrounding wall are independently 0.2 to 0.8 mm.

9. The button cell casing according to claim 1, wherein, The thicknesses of the parts of the second insulating kit provided on the inner side and the outer side of the second surrounding wall are independently 0.1 to 5 mm.

10. The button cell housing according to claim 9, characterized in that, The thicknesses of the parts of the second insulating kit provided on the inner side and the outer side of the second surrounding wall are independently 0.2 to 0.8 mm.

11. The button cell housing according to claim 1, characterized in that, The part of the first insulating kit provided on the inner side of the first surrounding wall abuts against the connection surface between the first annular wall and the second annular wall, and the part of the first insulating kit provided on the outer side of the first surrounding wall abuts against the outer side of the first annular wall.

12. The button cell casing according to claim 1, wherein, The part of the first insulating kit provided on the inner side of the first surrounding wall is consistent with the inner diameter ring surface of the first annular wall.

13. The button cell casing according to claim 1, characterized in that, The part of the second insulating kit provided on the inner side of the second surrounding wall abuts against the connection surface between the third annular wall and the second annular wall, and the part of the second insulating kit provided on the outer side of the second surrounding wall abuts against the outer side of the third annular wall.

14. The button cell casing according to claim 1, characterized in that, The part of the second insulating kit provided on the inner side of the second surrounding wall is consistent with the inner diameter ring surface of the third annular wall.

15. The button cell casing according to claim 1, characterized in that, The method of disposing the first insulation kit on the first surrounding wall includes injection molding.

16. The button cell casing according to claim 1, wherein, The method of disposing the second insulation kit on the second surrounding wall includes injection molding.

17. The button cell casing according to claim 1, characterized in that, The connection method of the first insulation kit and the second insulation kit includes at least one of hot melting, ultrasonic welding, welding, and bonding.

18. The button cell casing according to claim 17, characterized in that, The welding includes at least one of laser welding, ultrasonic welding, induction welding, and vibration welding.

19. The button cell casing according to claim 17, characterized in that, The bonding includes joining with glue.

20. The button cell casing according to claim 1, characterized in that, The materials of the positive metal end cap and the negative metal end cap independently include at least one of aluminum, iron, and stainless steel.

21. The button cell casing according to claim 1, wherein, The materials of the positive metal end cap and the negative metal end cap are the same or different.

22. The button cell housing according to claim 1, wherein, The materials of the first insulation kit and the second insulation kit independently include at least one of polymer materials.

23. The button cell housing according to claim 22, characterized in that, The polymer materials include at least one of polyethylene, polypropylene, polyvinyl chloride, polystyrene, acrylonitrile-butadiene-styrene copolymer, polyoxymethylene, polycarbonate, polymethyl methacrylate, and styrene-acrylonitrile copolymer.

24. The button cell casing according to claim 23, wherein, The polymer materials are at least one of polypropylene and polyethylene.

25. The button cell housing according to claim 1, characterized in that, By setting the first insulation kit and the second insulation kit to different colors, the positive electrode side and the negative electrode side are distinguished.

26. A button cell, characterized in that, The button cell includes the button cell housing according to any one of claims 1-25 and an electric core located inside the accommodation cavity of the button cell housing.

27. The button cell according to claim 26, wherein, The button cell includes a lithium-ion button cell.

28. The button cell according to claim 26, wherein, The button cell includes a liquid button cell, a semi-solid button cell, or a all-solid-state button cell.

29. The button cell according to claim 26, wherein, The shape of the button cell includes a cylinder, and the cylinder includes at least one of a cylinder, a regular polygonal cylinder, and a cylinder with an irregular cross-section.

30. The button cell according to claim 26, wherein, The diameter-height ratio of the button cell is greater than 1, equal to 1, or less than 1.

31. The button cell according to claim 26, wherein, The electric core is a wound electric core or a stacked electric core.

32. The button cell according to claim 31, wherein For a wound electric core, the axial direction of the electric core is perpendicular to the first bottom cover and the second bottom cover.

33. The button cell according to claim 31, wherein, For a stacked electric core, the stacking surface of the electric core is parallel to the first bottom cover and the second bottom cover.

Images