Cylindrical battery and preparation method therefor, and electric device

Abstract

Embodiments of the present invention relate to the technical field of new energy batteries. Disclosed are a cylindrical battery and a preparation method therefor, and an electric device. The cylindrical battery comprises a shell and a sealing member, and the shell comprises a first sealing portion and first air holes; the first air holes are formed in the first sealing portion; the sealing member is arranged in the first sealing portion; the sealing member is made of an elastic material; and the sealing member is provided with protrusion portions, and the protrusion portions are embedded into the first air holes. The cylindrical battery has better sealing performance, and solves the problem of risks caused by explosion and sealing structures being pop out of traditional batteries when short-circuited.

Description

Cylindrical battery, preparation method thereof and power-using device Technical Field

[0001] The present invention relates to the technical field of new energy batteries, and in particular to a cylindrical battery, a preparation method thereof, and an electrical device. Background Art

[0002] With the development of society, people's lives are becoming increasingly electronic and intelligent, and energy storage devices are becoming more and more important. At present, traditional lithium batteries are divided into steel-shell cylindrical batteries, square batteries and soft-pack batteries according to the packaging method. Among them, cylindrical batteries are widely used in electric vehicles, energy storage, digital and consumer products due to their high degree of standardization. Among them, steel-shell cylindrical batteries can be further divided into steel-shell cylindrical batteries, steel-shell button batteries, and aluminum-shell capacitor batteries (the general name for steel-shell cylindrical batteries in the industry, but other materials such as aluminum can be used as shells).

[0003] The difference between capacitive cylindrical batteries and steel-shell cylindrical batteries is that steel-shell batteries have a complex sealing layer (also called an explosion-proof valve, a complex explosion-proof structure composed of multiple materials and accessories); capacitive batteries adopt the structure of a capacitor, turning the complex explosion-proof structure into a simple explosion-proof plug structure (a plastic sleeve with two holes) and a concave explosion-proof indentation at the bottom (such as a cross, Y-shaped, or H-shaped explosion-proof groove).

[0004] Currently, these two types of cylindrical batteries each have their own disadvantages: first, steel-shell batteries will explode, and once the explosion-proof valve fails, the steel-shell battery will explode with great power; second, the explosion-proof structure of the steel-shell battery is not waterproof; third, the explosion-proof plug on the top of the capacitor battery is prone to leaking electrolyte and allowing external air to enter the battery at high and low temperatures; fourth, when an internal short circuit occurs in the capacitor battery, due to the waisted sealing structure of the encapsulated aluminum shell, the battery cannot release pressure by reopening the top explosion-proof plug, but instead releases pressure by breaking open the bottom explosion-proof structure, causing the battery to explode; fifth, the top plug of the capacitor battery is poorly waterproof.

[0005] Summary of the Invention

[0006] The embodiments of the present invention solve the problem that the sealing structure of a traditional battery is easily ejected and causes harm.

[0007] In order to solve the above problems, an embodiment of the present invention discloses a cylindrical battery having better sealing performance.

[0008] In a first aspect, the present invention provides a cylindrical battery, which includes a shell and a seal, the shell including a first sealing portion and a first air hole; the first air hole is arranged on the first sealing portion, the seal is arranged in the first sealing portion, the seal is made of elastic material, and the seal is provided with a protrusion, and the protrusion is embedded in the first air hole.

[0009] A further technical solution is that the shell further includes a corner portion and a receiving portion, the first sealing portion is obliquely connected to the receiving portion, and the first sealing portion is connected to the corner portion.

[0010] A further technical solution is that the inclination angle between the first sealing portion and the accommodating portion is 135°-179°.

[0011] A further technical solution is that the cylindrical battery further includes a fixing member, the fixing member is provided with a buffer airbag, and the fixing member is connected to the sealing member.

[0012] A further technical solution is that the shell further includes a recessed portion, and the recessed portion is connected to the first sealing portion and the accommodating portion respectively.

[0013] A further technical solution is that the diameter of the fixing member is smaller than the inner diameter of the sealing portion, and the diameter of the fixing member is smaller than the inner diameter of the recessed portion.

[0014] A further technical solution is that the cylindrical battery further includes a core body and a first tab, the core body is arranged in the shell, the first tab is provided with a clamping portion, the first tab passes through the sealing member of the cylindrical battery and is connected to the core body.

[0015] A further technical solution is that the thermal expansion and contraction coefficient of the sealing member of the cylindrical battery is equal to the thermal expansion and contraction coefficient of the core.

[0016] A further technical solution is that the cylindrical battery also includes a plurality of the sealing members, the core includes a second pole tab and a third pole tab, the shell also includes a second sealing portion and a second air hole, the first sealing portion and the second sealing portion are respectively connected to the accommodating portion, the second air hole is provided on the second sealing portion, the sealing members are respectively provided in the first sealing portion and the second sealing portion, the first sealing portion is provided around the second pole tab, and the second sealing portion is provided around the third pole tab.

[0017] A further technical solution is that the second sealing portion is connected to the accommodating portion at an angle.

[0018] A further technical solution is that the cylindrical battery further includes a plurality of sealing members, and the plurality of sealing members are stacked in the first sealing portion.

[0019] A further technical solution is that the first air holes are arranged around the first sealing portion and are provided in multiple rows.

[0020] A further technical solution is that it further includes a groove, which is arranged around the first air hole. The sealing component is also provided with a plugging part, which is connected to the protruding part and is arranged on the groove.

[0021] A further technical solution is that there are multiple plugging parts, and some of the plugging parts are connected.

[0022] A further technical solution is that the thickness of the sealing member is less than or equal to 1 mm.

[0023] A further technical solution is that the cylindrical battery further includes a first mark and a second mark, and the first mark and the second mark are both provided on the sealing member.

[0024] A further technical solution is that it also includes a circuit board and a charging module, wherein the charging module is arranged on the circuit board, the circuit board is inside the shell, and the circuit board is connected to the core.

[0025] In a second aspect, the present invention further provides a method for preparing a cylindrical battery, the method comprising:

[0026] S1, preparing a shell and placing a predetermined core in the shell;

[0027] S2, injecting a first liquid packaging material into the first sealing portion of the housing and the first air hole of the housing, and waiting for the first liquid packaging material to solidify to obtain a sealing member, wherein the sealing member surrounding the first air hole is a raised portion.

[0028] A further technical solution is that the core includes a full tab, and in step S1, a second liquid packaging material is coated on the surface of the full tab.

[0029] A further technical solution is that after step S2, the method further includes:

[0030] S3, discharging the gas in the cavity formed by the housing and the sealing member;

[0031] S4, injecting a third liquid packaging material into the first sealing portion of the housing, and waiting for the third liquid packaging material to solidify to obtain a sealing member.

[0032] A further technical solution is that after step S2, the method further includes:

[0033] S5, placing the PCBA circuit board in the housing, pouring a fourth liquid packaging material into the PCBA circuit board, and waiting for the fourth liquid packaging material to solidify to obtain a sealing member.

[0034] In a third aspect, the present invention further provides a battery, comprising a cylindrical battery as described in any one of the embodiments of the first aspect above.

[0035] In a fourth aspect, the present invention further provides an electrical device comprising a battery as described in any one of the embodiments of the third aspect above, wherein the battery is used to provide electrical energy.

[0036] Compared with the prior art, the embodiments of the present invention can achieve the following technical effects:

[0037] There's no need to add a complex explosion-proof valve. By preserving air holes in the housing and utilizing the elastic deformation force of the seal, when the air pressure inside the cylindrical battery increases and the pressure on the seal reaches the seal's deformation force threshold, the seal deforms to connect the air holes with the inside of the cylindrical battery, releasing gas and achieving pressure relief. Alternatively, when the air pressure inside the cylindrical battery increases sharply and the pressure on the seal exceeds the seal's deformation force threshold, the seal can deform and bulge toward the opening of the housing. During this process, the air holes connect with the inside of the cylindrical battery, releasing gas and achieving pressure relief, preventing the seal from popping out. This effectively prevents explosions caused by rising air pressure inside the cylindrical battery. The seal's structure is simpler than conventional explosion-proof structures, providing both excellent explosion-proof performance and reduced manufacturing costs.

[0038] Compared with the prior art, the battery provided by the embodiment of the present invention can achieve the following technical effects:

[0039] First, the sealing effect. The most important function of the sealing layer is to isolate the inside and outside of the battery. Since the electrolyte inside the battery or capacitor easily reacts with moisture and oxygen in the air, the sealing layer of the battery must have good sealing properties. Second, the explosion-proof effect. Since the battery or capacitor is an energy storage device that stores a large amount of energy internally, high pressure will be generated inside the device when short-circuited. The metal shell seals the battery, so the sealing layer needs to have the function of explosion-proof pressure relief. Since traditional explosion-proof valves are expensive, the sealing layer on some low-end steel shell batteries only has a sealing function but no explosion-proof function. The traditional steel shell cylindrical battery has a complex and expensive sealed explosion-proof structure, and the capacitive battery is sealed in the form of a waist and a plug. It is easy to leak electrolyte at high temperatures and will explode when short-circuited. Therefore, the present application proposes a cylindrical battery with a one-way valve (i.e., a seal) with a self-repairing structure to improve the safety and waterproofness of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0041] FIG1 is a schematic structural diagram of a cylindrical battery provided by an embodiment of the present invention;

[0042] FIG2 is a schematic diagram of the cross-sectional structure of a cylindrical battery provided in an embodiment of the present invention;

[0043] FIG3 is a schematic diagram of a cross-sectional structure of a cylindrical battery provided in an embodiment of the present invention;

[0044] FIG4 is a schematic diagram of a cross-sectional structure of a cylindrical battery provided in an embodiment of the present invention;

[0045] FIG5 is a schematic diagram of a cross-sectional structure of a cylindrical battery provided in an embodiment of the present invention;

[0046] FIG6 is a schematic diagram of a cross-sectional structure of a cylindrical battery provided in an embodiment of the present invention;

[0047] FIG7 is a schematic diagram of a cross-sectional structure of a cylindrical battery provided in an embodiment of the present invention;

[0048] FIG8 is a schematic diagram of a cross-sectional structure of a cylindrical battery provided in an embodiment of the present invention;

[0049] FIG9 is a schematic structural diagram of a cylindrical battery provided by an embodiment of the present invention;

[0050] FIG10 is a schematic structural diagram of a cylindrical battery provided by an embodiment of the present invention;

[0051] FIG11 is a schematic structural diagram of a cylindrical battery provided by an embodiment of the present invention;

[0052] FIG12 is a schematic diagram of a cross-sectional structure of a cylindrical battery provided in an embodiment of the present invention;

[0053] FIG13 is a partial enlarged view of the cross-sectional structure of a cylindrical battery provided in an embodiment of the present invention;

[0054] FIG14 is a schematic structural diagram of a core body provided in an embodiment of the present invention;

[0055] FIG15 is a schematic structural diagram of a second electrode tab provided in an embodiment of the present invention;

[0056] FIG16 is a schematic structural diagram of a third electrode tab provided in an embodiment of the present invention;

[0057] FIG17 is a schematic flow chart of a method for preparing a cylindrical battery according to an embodiment of the present invention;

[0058] FIG18 is a schematic flow chart of another method for preparing a cylindrical battery according to an embodiment of the present invention;

[0059] FIG19 is a schematic flow chart of another method for preparing a cylindrical battery according to an embodiment of the present invention;

[0060] FIG20 is a schematic flow chart of another method for preparing a cylindrical battery provided in an embodiment of the present invention.

[0061] Figure markings include shell 1, sealing part 2, first sealing portion 11, first air hole 12, accommodating portion 13, fixing part 3, cushioning airbag 31, second sealing part 14, second air hole 15, recessed portion 16, angled portion 17, first mark 41, second mark 42, core 5, second pole ear 51, third pole ear 52, first pole ear 6, clamping portion 61, protrusion 71, plugging portion 72, groove 8. DETAILED DESCRIPTION

[0062] The following will be combined with the accompanying drawings of the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments. Similar component numbers in the drawings represent similar components. Obviously, the embodiments described below are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0063] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0064] It should also be understood that the terms used in this description of the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present invention. As used in the description of the embodiments of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0065] 1-16 , an embodiment of the present invention provides a cylindrical battery. The cylindrical battery includes a housing 1 and a seal 2. The components are described in detail below:

[0066] In this embodiment, the shell 1 includes a first sealing portion 11 and a first air hole 12; the first air hole 12 is arranged on the first sealing portion 11, and the sealing member 2 is arranged in the first sealing portion 11. The sealing member 2 is made of elastic material, and the sealing member 2 is provided with a protrusion 71, and the protrusion 71 is embedded in the first air hole 12.

[0067] Specifically, the first sealing portion 11 refers to a portion of the housing 1. This portion is provided with a plurality of first air holes 12, all of which are arranged around the periphery of the sealing element 2. The sealing element 2 is made of an elastic material that is cast and allowed to solidify by liquid, and exhibits the characteristic of deforming when an external force is applied. During the pouring of the liquid, the first air holes 12 are filled. After solidification, the sealing element 2 that fills the first air holes 12 becomes the raised portion 71 of the sealing element 2.

[0068] Under normal conditions, the seal 2 fits tightly against the inner wall of the shell 1, thereby blocking the connection between the first air hole 12 and the interior of the cylindrical battery. When the air pressure inside the cylindrical battery increases and the pressure exerted on the seal 2 reaches the deformation force threshold of the seal 2, the seal 2 deforms to create a gap between the seal 2 and the inner wall of the shell 1, and also between the seal 2 and the inner wall of the first air hole 12. Gas can pass through the gap from the interior of the cylindrical battery through the first air hole 12 to the outside, achieving the effect of degassing and reducing pressure inside the cylindrical battery. In one embodiment, the deformation force threshold of the seal 2 can be affected by the thickness of the seal 2. When the thickness of the seal 2 is higher, the deformation force threshold of the seal 2 is higher; when the thickness of the seal 2 is lower, the deformation force threshold of the seal 2 is lower.

[0069] The working process of the cylindrical battery is as follows:

[0070] A preset degassing device is installed inside the cylindrical battery. The degassing device releases gas, which increases the air pressure inside the cylindrical battery. The air pressure generated by the air pressure on the seal 2 increases with the increase of the air pressure. When the air pressure generated by the air pressure on the seal 2 does not reach the deformation force threshold of the seal 2, the seal 2 blocks the connection between the first air hole 12 and the inside of the cylindrical battery, thereby ensuring that the gas inside the cylindrical battery does not leak to the outside world; when the degassing device abnormally releases a large amount of gas, the air pressure generated by the air pressure on the seal 2 reaches the deformation force threshold of the seal 2, the seal 2 is deformed. The deformation of the seal 2 causes a gap to exist between the seal 2 and the inner wall of the shell 1, and also causes a gap to exist between the seal 2 and the inner wall of the first air hole 12. The gas can be discharged from the inside of the cylindrical battery through the first air hole 12 to the outside world through the gap, thereby achieving the effect of degassing and reducing the pressure inside the cylindrical battery.

[0071] Without the need for a complex explosion-proof structure, the housing 1 reserves air holes and utilizes the elastic deformation force of the seal 2. When the air pressure inside the cylindrical battery increases and the pressure on the seal 2 reaches the deformation force threshold of the seal 2, the seal 2 deforms to connect the air hole with the interior of the cylindrical battery, thereby releasing gas and achieving pressure relief. Alternatively, when the air pressure inside the cylindrical battery increases sharply and the pressure on the seal 2 exceeds the deformation force threshold of the seal 2, the seal 2 can deform and bulge toward the opening of the housing 1 (see Figure 3). During the process of the seal 2 deforming and bulging, the air hole connects with the interior of the cylindrical battery, thereby releasing gas and achieving pressure relief, preventing the seal 2 from popping out. This effectively prevents the cylindrical battery from exploding due to increased air pressure. The structure of the seal 2 is simpler than that of conventional explosion-proof structures. This cylindrical battery not only has good explosion-proof performance, but also eliminates the cost of explosion-proof valves, thereby reducing the manufacturing cost of cylindrical batteries. It should be noted that, in one embodiment, the capacitor is similar to a battery, and the preparation of the capacitor also needs to have explosion-proof and sealing properties. It can be understood that the shell 1, the seal 2, the first air hole 12 and the first sealing portion 11 can be applied to the capacitor, so that the capacitor has both good sealing and explosion-proof properties. Compared with the traditional explosion-proof valve, failure will not cause an explosion, and the cost of the explosion-proof valve can be saved to reduce the manufacturing cost of the capacitor.

[0072] In this embodiment, the housing 1 further includes a corner portion 17 and an accommodating portion 13 . The first sealing portion 11 is obliquely connected to the accommodating portion 13 , and the first sealing portion 11 is connected to the corner portion 17 .

[0073] The corner portion 17 refers to an area obtained by surrounding a part of the shell 1, which is formed by stamping the shell 1. It should be noted that the specific stamping process can be determined by referring to existing data, and the present invention does not make any specific limitations on this. It is used to narrow the opening of the shell 1 to prevent the seal 2 from escaping from the opening of the shell 1. The accommodating portion 13 refers to an area obtained by surrounding a part of the shell 1, which is used to place a preset degassing device. When the first sealing portion 11 is connected to the accommodating portion 13 in a straight manner, the seal 2 cannot rebound after deformation, so the cylindrical battery will not be able to restore the sealing effect after the seal 2 is deformed. When the first sealing portion 11 is connected to the accommodating portion 13 at an angle, under the action of the inclined inner wall of the shell 1, the seal 2 can rebound to its state before deformation after deformation, that is, the seal 2 is closely fitted with the inner wall of the shell 1, and the seal 2 is closely fitted with the inner wall of the first air hole 12, blocking the connection between the first air hole 12 and the inside of the cylindrical battery.

[0074] The inner diameter of the first sealing portion 11 at one end close to the accommodating portion 13 is equal to the inner diameter of the accommodating portion 13, and the inner diameter of the first sealing portion 11 gradually decreases from the end close to the accommodating portion 13 to the end away from the accommodating portion 13, thereby obtaining a structure in which the first sealing portion 11 is narrow at the top and wide at the bottom, that is, the first sealing portion 11 is obliquely connected to the accommodating portion 13. On the one hand, it can effectively ensure that the sealing member 2 will not detach from the inside of the shell 1 under normal conditions, thereby increasing the sealing performance of the cylindrical battery; on the other hand, the angle between the inner wall of the first sealing portion 11 and the inner wall of the accommodating portion 13 can be changed to adjust the deformation force threshold of the sealing member 2, wherein, the larger the angle between the inner wall of the sealing portion and the inner wall of the accommodating portion 13, the lower the deformation force threshold of the sealing member 2, and the smaller the angle between the inner wall of the sealing portion and the inner wall of the accommodating portion 13, the higher the deformation force threshold of the sealing member 2.

[0075] Furthermore, the cylindrical battery further includes a plurality of sealing members 2 , which are stacked in the first sealing portion 11 .

[0076] Specifically, the cylindrical battery includes a multi-layer structure composed of a plurality of stacked seals 2. In one embodiment, the cylindrical battery is formed by stacking seals 2 of different sizes so that the seals 2 fit more closely to the inner wall of the shell 1, thereby improving the sealing performance.

[0077] Furthermore, the thickness of the sealing member 2 is less than or equal to 1 mm.

[0078] Specifically, the thickness of the sealing member 2 is less than or equal to 1 mm. Compared with conventional explosion-proof structures, the battery obtained by packaging the cylindrical batteries has a higher energy density.

[0079] Furthermore, it also includes a first mark 41 and a second mark 42 , and the first mark 41 and the second mark 42 are both provided on the sealing member 2 .

[0080] Specifically, the surface of the seal 2 can be painted with color, and the first mark 41 and the second mark 42 are respectively an area on the seal 2. In one embodiment, the cylindrical battery is applied to a capacitive battery, the first mark 41 is red, and the second mark 42 is black. The first mark 41 is set on the seal 2 in the positive electrode area, and the second mark 42 is set on the seal 2 in the negative electrode area to facilitate the distinction between the positive and negative poles of the capacitive battery.

[0081] Furthermore, the cylindrical battery further includes a fixing member 3 , the fixing member 3 is provided with a buffer airbag 31 , and the fixing member 3 is connected to the sealing member 2 .

[0082] Specifically, the fixing part 3 is made of a hard material, and the buffer airbag 31 on the fixing part 3 is used to increase the internal space of the cylindrical battery. The buffer airbag 31 is a groove of the fixing part 3, or the buffer airbag 31 is an elastic cavity, which is used to increase the volume of the gas stored inside the shell 1. The increase in the volume of the internally stored gas reduces the gas density in the shell 1, thereby reducing the gas pressure, which can effectively increase the life of the seal 2.

[0083] Furthermore, the inclination angle between the first sealing portion 11 and the accommodating portion 13 is 135°-179°.

[0084] Specifically, the inclination angle between the first sealing portion 11 and the accommodating portion 13 refers to the angle formed by the inner wall of the first sealing portion 11 and the inner wall of the accommodating portion 13, that is, the angle A in the figure. In one embodiment, the value range of the angle A is between 135° and 179°, which can effectively ensure that the seal 2 has a rebound effect, wherein the size of the angle A affects the number of rebounds of the seal 2. When the angle A is larger, the number of rebounds of the seal 2 is smaller; when the angle A is smaller, the number of rebounds of the seal 2 is more.

[0085] Furthermore, it includes a core 5 and a first tab 6 , wherein the core 5 is disposed in the cylindrical battery, the first tab 6 is provided with a clamping portion 61 , and the first tab 6 passes through the sealing member 2 of the cylindrical battery and is connected to the core 5 .

[0086] Specifically, the core 5 is disposed within the housing 13 of the housing 1. The core 5, also known as a wound core or a stacked core, is used for chemical reaction discharge and gas release. The cylindrical battery can effectively prevent the core 5 from generating a large amount of gas and causing an explosion when a short circuit occurs. The first tab 6 refers to the positive and negative electrodes used to connect to the core 5. In one embodiment, the first tab 6 includes the positive and negative leads of the battery. The shapes of the clamping portion 61 include S-type, L-type, and U-type. The first tab 6 passes through the seal 2 to connect to the core 5. The clamping portion 61 is located in the portion of the first tab 6 that does not pass through the seal 2. The clamping portion 61 of the first tab 6 is used to fix the position of the seal 2 in the housing 1. When a large amount of gas is generated when a short circuit occurs in the core 5, the seal 2 is prevented from popping out of the housing 1 and causing damage to the outside world.

[0087] Furthermore, the first air holes 12 are arranged around the first sealing portion 11 and are provided in multiple rows.

[0088] Specifically, the first air holes 12 are formed by stamping the housing 1. It should be noted that the specific stamping process can be determined by reference to existing data and is not specifically limited in the present invention. The first air holes 12 are arranged at equal intervals on the first sealing portion 11. In one embodiment, the first sealing portion 11 has two rows of first air holes 12. Multiple sealing members 2 are stacked within the first sealing portion 11 so that, under normal conditions, each layer of sealing member 2 blocks each row of first air holes 12.

[0089] In one embodiment, the seal 2 and the fixing member 3 are made of different materials, wherein one surface of the seal 2 is used for contact with the outside world and can be coated with wear-resistant material to achieve a wear-resistant effect; the fixing member 3 is used to support and connect the seal 2 and the core 5, and is usually made of a material with a hardness greater than 60HRC; the buffer airbag 31 of the fixing member 3 is used to alleviate the expansion of the gas generated by the operation of the preset deflation device, and the gas can also enter the gap between the seal 2 and the fixing member 3, which can further alleviate the expansion of the gas generated by the operation of the preset deflation device. In one embodiment, the relieving of the expansion of the gas causes the air pressure to drop, and the drop in air pressure inside the battery is conducive to reducing the resistance of the core 5, so that the cylindrical battery obtained has a lower internal resistance effect.

[0090] Furthermore, the housing 1 further includes a recessed portion 16 , and the recessed portion 16 is connected to the first sealing portion 11 and the accommodating portion 13 respectively.

[0091] Specifically, the housing 1 can be stamped to obtain a recessed portion 16 , which can further reinforce the sealing member 2 disposed in the first sealing portion 11 . In one embodiment, the recessed portion 16 is also used to connect with the fixing member 3 .

[0092] Furthermore, the diameter of the fixing member 3 is smaller than the inner diameter of the sealing portion, and the diameter of the fixing member 3 is smaller than the inner diameter of the recessed portion 16 .

[0093] Specifically, the fixing member 3 is used to support and connect the sealing member 2. The sealing member 2 needs to deform to achieve the explosion-proof effect. Typically, the diameter of the fixing member 3 is 5% smaller than the minimum inner diameter of the housing 1. In one embodiment, the minimum inner diameter of the housing 1 refers to the inner diameter of the sealing portion, or the minimum inner diameter of the housing 1 refers to the inner diameter of the recessed portion 16 of the housing 1. The diameter of the fixing member 3 is smaller than the minimum inner diameter of the housing 1 to facilitate the deformation of the sealing member 2, ultimately achieving the explosion-proof effect.

[0094] In one embodiment, the shell 1 is provided with a recessed portion 16, which is formed by stamping the shell 1. It should be noted that the specific stamping process can be determined by referring to existing data, and the present invention does not make specific limitations on this. The first sealing portion 11 is connected to the accommodating portion 13 at an angle. When the first sealing portion 11 is connected to the accommodating portion 13 at an angle, under the action of the inclined inner wall of the shell 1, the seal 2 can rebound to its state before deformation after deformation, that is, the seal 2 is closely fitted with the inner wall of the shell 1, and the seal 2 is closely fitted with the inner wall of the first pore 12, blocking the connection between the first pore 12 and the interior of the cylindrical battery, and the recessed portion 16 can effectively reinforce the seal 2 in the first sealing portion 11, so that the seal 2 can rebound in time after deformation, that is, the effect of a one-way valve with a self-repairing structure is achieved.

[0095] Furthermore, the thermal expansion and contraction coefficient of the sealing member 2 of the cylindrical battery is equal to the thermal expansion and contraction coefficient of the core 5 .

[0096] Specifically, the thermal expansion coefficient refers to the thermal expansion and contraction properties of the material. The thermal expansion and contraction coefficient of the seal 2 can be adjusted to be equal to the thermal expansion and contraction coefficient of the core 5 to ensure that the seal 2 and the core 5 have the same thermal expansion and contraction properties at different temperatures, thereby increasing the safety of the cylindrical battery.

[0097] Furthermore, it also includes a plurality of the sealing members 2, the core 5 includes a second pole tab 51 and a third pole tab 52, the shell 1 also includes a second sealing portion 14 and a second air hole 15, the first sealing portion 11 and the second sealing portion 14 are respectively connected to the accommodating portion 13, the second air hole 15 is arranged on the second sealing portion 14, the sealing members 2 are respectively arranged in the first sealing portion 11 and the second sealing portion 14, the first sealing portion 11 is arranged around the second pole tab 51, and the second sealing portion 14 is arranged around the third pole tab 52.

[0098] Furthermore, the second sealing portion 14 is connected to the accommodating portion 13 at an angle.

[0099] In one embodiment, the core 5 is a full-tab core, including a core, a second tab 51, and a third tab 52. The second tab 51 refers to the positive electrode provided on the full-tab core, and the third tab 52 refers to the negative electrode of the full-tab core. Referring to FIG12 , the second tab 51 and the third tab 52 are respectively provided at both ends of the core. The two ends of the accommodating portion 13 are respectively provided with a first sealing portion 11 and a second sealing portion 14. The second sealing portion 14 refers to a portion of the shell 1 on the shell 1. The second sealing portion 14 of the shell 1 is provided with a plurality of second air holes 15. All second air holes 15 are provided around the sealing member 2. The sealing member 2 is an elastic material obtained by liquid casting and waiting for solidification. It has the characteristic of deformation when an external force is applied to it. When the liquid is cast, the liquid fills the second air holes 15. After solidification, the sealing member 2 filled in the second air holes 15 is the raised portion 71 of the sealing member 2. When the second sealing portion 14 is connected to the accommodating portion 13 at an angle, under the action of the inclined inner wall of the shell 1, the seal 2 can rebound to its pre-deformation state after deformation, that is, the seal 2 is closely fitted with the inner wall of the shell 1, and the seal 2 is closely fitted with the inner wall of the second air hole 15, blocking the connection between the second air hole 15 and the interior of the cylindrical battery. It can be understood that the seal 2 can be used at both ends of the accommodating portion 13 to seal the shell 1 to achieve an explosion-proof effect. In one embodiment, the battery has a first sealing portion 11 and a second sealing portion 14 at both ends. The negative electrode of the traditional battery is welded to the shell 1, which is difficult to process. The use of this cylindrical battery can reduce the steps of welding the negative electrode to the shell 1, greatly reducing the processing difficulty.

[0100] Furthermore, it also includes a groove 8, which is arranged around the first air hole 12. The sealing member 2 is also provided with a plugging portion 72, which is connected to the protruding portion 71 and is arranged on the groove 8.

[0101] Specifically, the number of grooves 8 is equal to the number of first air holes 12, and they are disposed on the outside of the first sealing portion 11, surrounding the four sides of the first air holes 12. The sealing member's plugging portion 72 is connected to the sealing member's raised portion 71. It can be understood that the sealing member 2 disposed within the first air hole 12 is the raised portion, and the sealing member 2 disposed within the grooves 8 is the plugging portion. The addition of the plugging portion 72 to the sealing member 2 greatly enhances the secure connection between the sealing member 2 and the housing 1, preventing the sealing member 2 from being dislodged from the housing 1. Furthermore, the addition of the grooves 8 for the sealing member's plugging portion 72 provides a smoother and more aesthetically pleasing connection between the first sealing portion 11 and the plugging portion 72.

[0102] Furthermore, there are multiple plugging parts 72, and some of the plugging parts 72 are connected.

[0103] Specifically, the number of the plugging parts 72 is equal to the number of the first air holes. The plugging parts 72 and the plugging parts 72 can be extended to form an arc-shaped body. When all the plugging parts 72 are connected, a ring body is formed that is sleeved on the first sealing part 11. Preferably, some of the plugging parts 72 are connected to form multiple arc-shaped bodies, which are arranged around the first sealing part 11.

[0104] The connection between the plugging parts 72 forms a plurality of arc-shaped bodies, which are respectively arranged around the four sides of the first sealing part 11 , and can further improve the firmness of the connection between the sealing member 2 and the housing 1 .

[0105] Furthermore, it also includes a circuit board and a charging module. The charging module is arranged on the circuit board. The circuit board is inside the shell 1 and is connected to the core 5.

[0106] Specifically, a layer of sealing member can be added to encapsulate the circuit board in the shell 1. The circuit board includes a PCBA circuit board. In this embodiment, the charging module includes any one or more combinations of a MicroUSB interface, a Type-C interface, and a Lightning interface. The circuit board is respectively connected to the charging module and the core 5 to realize charging of the core 5 through the charging module. It should be noted that a charging circuit for controlling charging can be provided on the circuit board. The charging circuit can be determined by referring to existing data. The present invention does not make specific limitations on this. In one embodiment, the shell 1 is also provided with an opening, and the charging module is also embedded in the opening. The sealing member fills the gap between the charging module and the opening to realize a fixed connection between the charging module and the shell 1. The charging cable can be passed through the opening to connect to the charging module to realize electrical connection, thereby charging the battery cell.

[0107] The battery provided by the embodiment of the present invention has the following beneficial effects:

[0108] First, the sealing effect. The most important function of the sealing layer is to isolate the inside and outside of the battery. Since the electrolyte inside the battery or capacitor easily reacts with moisture and oxygen in the air, the sealing layer of the battery must have good sealing properties. Second, the explosion-proof effect. Since the battery or capacitor is an energy storage device that stores a large amount of energy internally, high pressure will be generated inside the device when short-circuited. The metal shell is used to seal the battery, so the sealing layer needs to have the function of explosion-proof pressure relief. Since traditional explosion-proof valves are expensive, the sealing layer on some low-end steel shell batteries only has a sealing function but no explosion-proof function. The traditional steel shell cylindrical battery has a complex and expensive sealed explosion-proof structure, and the capacitive battery is sealed in the form of a waist and a plug. It is easy to leak electrolyte at high temperatures and will explode when short-circuited. Therefore, the present application proposes a cylindrical battery with a one-way valve (i.e., a seal 2) with a self-repairing structure to improve the safety and waterproofness of the battery.

[0109] 17 , an embodiment of the present invention further provides a method for preparing a cylindrical battery, comprising steps S1-S4:

[0110] S1, preparing a shell and placing a predetermined core in the shell;

[0111] Specifically, preparing the shell includes shaping, which means preparing the battery shell into a required shape.

[0112] In one embodiment, the predetermined core is prepared through steps S11-S12:

[0113] S11, prepare pole pieces: prepare the positive and negative electrode materials into active materials, load them onto the current collector, and load the positive and negative pole pieces with positive and negative pole tabs (when full pole tabs or multiple pole tabs are used, the positive and negative pole tabs are loaded directly at the end cut of the current collector without the need for welding).

[0114] S12, core winding or core stacking: The positive and negative electrode sheets are insulated with a separator and then wound into a core. Alternatively, a layer-by-layer stacking method is adopted to prepare a core stack. In one embodiment, the core stacking method is a first stacking method (positive electrode-separator (solid electrolyte)-negative electrode-separator (solid electrolyte)-positive electrode...), or a second stacking method (negative electrode-separator (solid electrolyte)-positive electrode-separator (solid electrolyte)-negative electrode...).

[0115] The preset core is placed in the shell, and the core and the bottom of the shell are welded together to weld the tabs at the non-sealed end of the winding core to the shell, and then the electrolyte is injected into the core.

[0116] S2, injecting a first liquid packaging material into the first sealing portion of the housing and the first air hole of the housing, and waiting for the first liquid packaging material to solidify to obtain a sealing member, wherein the sealing member surrounding the first air hole is a raised portion.

[0117] Specifically, the battery is isolated from the air, and the shell is sealed for the first time by injecting a first liquid packaging material into the shell, and waiting for the first liquid packaging material to solidify to form a seal, and the sealed shell is subjected to an aging process and a formation process. The aging process refers to placing the core body that has been injected with electrolyte in a high-temperature room for aging, so that the electrolyte fully infiltrates the positive and negative pole pieces of the battery. The formation process refers to the first charging process of the battery after the lithium battery is filled with liquid. This process can activate the active substances in the battery and activate the lithium battery. At the same time, the lithium salt reacts with the electrolyte to generate a solid electrolyte interface (SEI) film on the negative electrode side of the lithium battery. This film can prevent further side reactions from occurring, thereby reducing the loss of active lithium in the lithium battery.

[0118] In one embodiment, referring to FIG. 18 , after the battery undergoes the formation process, steps S3-S4 are further included:

[0119] S3, discharging the gas in the cavity formed by the shell and the sealing member.

[0120] Optionally, after the battery generates and discharges gas through a formation process, the seal formed by solidifying the first liquid packaging material is punctured to discharge the gas generated by the formation process from the inside of the shell.

[0121] S4, injecting a third liquid packaging material into the first sealing portion of the housing, and waiting for the third liquid packaging material to solidify to obtain a sealing member.

[0122] Specifically, a third liquid packaging material is injected onto the seal formed by solidification of the first liquid packaging material, and the third liquid packaging material is allowed to solidify to form a new seal to seal the shell for the second time, thereby obtaining a cylindrical battery with multi-layer seals.

[0123] In one embodiment, the core includes a full tab, and in step S1 , a second liquid packaging material is coated on the surface of the full tab.

[0124] Specifically, the core includes a wound core or a stacked core, and the full tabs become multi-tabs. A second liquid encapsulating material is applied to the multi-tab area. After the second liquid encapsulating material solidifies, the tabs undergo a flattening process. Because the second liquid encapsulating material wraps around the tabs and the separator, it effectively prevents sharp edges of the tabs from piercing the separator and causing a battery short circuit during the flattening process.

[0125] In one embodiment, after step S2, the method further includes: S5, placing the PCBA circuit board in the housing, pouring a fourth liquid packaging material into the PCBA circuit board, and waiting for the fourth liquid packaging material to solidify to obtain a sealing member.

[0126] Traditional steel-shell batteries place the protection board (PCBA circuit board) inside the shell, and then cover the protection board with a cap to encapsulate the protection board on the battery. The cap is a protective component covering the battery, usually made of plastic or metal. The material of the cap directly affects the cost of the battery.

[0127] In this embodiment, a layer of sealing member can be added to encapsulate the PCBA circuit board in the housing. Specifically, referring to FIG19 , after step S2, the PCBA circuit board is placed on the sealing member obtained by solidifying the first liquid, and then a fourth liquid packaging material is injected into the PCBA circuit board. The fourth liquid packaging material is waited for to solidify to obtain a new sealing member. The PCBA circuit board is encapsulated in the housing by the sealing member obtained by solidifying the fourth liquid packaging material. Alternatively, referring to FIG20 , after step S4, the PCBA circuit board is placed on the sealing member obtained by solidifying the third liquid, and then a fourth liquid packaging material is injected into the PCBA circuit board. The fourth liquid packaging material is waited for to solidify to obtain a new sealing member. The PCBA circuit board is encapsulated in the housing by the sealing member obtained by solidifying the fourth liquid packaging material. The PCBA circuit board refers to a protective plate welded on the electrode to prevent overcharging or over-discharging during battery charging. The specific PCBA circuit board can be determined by reference to existing data and is not specifically limited in this invention.

[0128] The sealing member obtained by solidifying the fourth liquid packaging material encapsulates the PCBA circuit board in the shell, and has the same sealing performance as the cap, and can save the corresponding cost of purchasing plastic and metal caps.

[0129] The present invention also provides a battery, comprising the cylindrical battery as described in any one of the above embodiments.

[0130] In this embodiment, the battery can be obtained by combining a plurality of cylindrical batteries described in any of the above embodiments.

[0131] The present invention further provides an electrical device comprising a battery as described in any one of the above embodiments, wherein the battery is used to provide electrical energy.

[0132] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0133] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships 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, 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 understood as limiting the present invention.

[0134] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0135] In the present invention, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood broadly. For example, they may refer to connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0136] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0137] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean 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 expressions of the above terms should not be understood as necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification.

[0138] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, to the extent such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to encompass such changes and modifications.

[0139] The above description is a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A cylindrical battery, characterized in that: It includes a shell and a sealing member, wherein the shell includes a first sealing portion and a first air hole; the first air hole is arranged on the first sealing portion, the sealing member is arranged in the first sealing portion, the sealing member is made of elastic material, the sealing member is provided with a protrusion, and the protrusion is embedded in the first air hole.

2. The cylindrical battery according to claim 1, characterized in that: The shell further includes a corner portion and a receiving portion, the first sealing portion is obliquely connected to the receiving portion, and the first sealing portion is connected to the corner portion.

3. The cylindrical battery according to claim 2, characterized in that: The inclination angle between the first sealing portion and the accommodating portion is 135°-179°.

4. The cylindrical battery according to claim 2, characterized in that: The cylindrical battery further comprises a fixing member, the fixing member is provided with a buffer air bag, and the fixing member is connected to the sealing member.

5. The cylindrical battery according to claim 4, characterized in that: The housing further includes a recessed portion, and the recessed portion is respectively connected to the first sealing portion and the accommodating portion.

6. The cylindrical battery according to claim 5, characterized in that: The diameter of the fixing member is smaller than the inner diameter of the sealing portion, and the diameter of the fixing member is smaller than the inner diameter of the recessed portion.

7. The cylindrical battery according to claim 2, characterized in that: The cylindrical battery further comprises a core body and a first pole ear. The core body is arranged in the shell. The first pole ear is provided with a clamping portion. The first pole ear passes through the sealing member and is connected to the core body.

8. The cylindrical battery according to claim 7, characterized in that: The thermal expansion and contraction coefficient of the sealing member is equal to the thermal expansion and contraction coefficient of the core.

9. The cylindrical battery according to claim 7, characterized in that: It also includes a plurality of the sealing members, the core body includes a second pole ear and a third pole ear, the shell body also includes a second sealing portion and a second air hole, the first sealing portion and the second sealing portion are respectively connected to the accommodating portion, the second air hole is arranged on the second sealing portion, the sealing members are respectively arranged in the first sealing portion and the second sealing portion, the first sealing portion is arranged around the second pole ear, and the second sealing portion is arranged around the third pole ear.

10. The cylindrical battery according to claim 9, characterized in that: The second sealing portion is connected to the accommodating portion at an angle.

11. The cylindrical battery according to claim 1, characterized in that: The cylindrical battery further includes a plurality of sealing members, and the plurality of sealing members are stacked in the first sealing portion.

12. The cylindrical battery according to claim 11, characterized in that: The first air holes are arranged around the first sealing portion and are arranged in multiple rows.

13. The cylindrical battery according to claim 1, characterized in that: It also includes a groove, which is arranged around the first air hole. The sealing component is also provided with a plugging part, which is connected to the protruding part and is arranged on the groove.

14. The cylindrical battery according to claim 13, characterized in that: There are multiple plugging parts, and some of the plugging parts are connected.

15. The cylindrical battery according to claim 1, characterized in that: The thickness of the sealing member is less than or equal to 1 mm.

16. The cylindrical battery according to claim 1, characterized in that: The cylindrical battery further includes a first mark and a second mark, and the first mark and the second mark are both arranged on the sealing member.

17. The cylindrical battery according to claim 7, characterized in that: It also includes a circuit board and a charging module. The charging module is arranged on the circuit board. The circuit board is inside the shell and connected to the core.

18. A method for preparing a cylindrical battery according to any one of claims 1 to 17, characterized in that: The method comprises: S1, preparing a shell, and placing a preset core in the shell; S2, injecting a first liquid packaging material into the first sealing portion of the shell and the first air hole of the shell, and waiting for the first liquid packaging material to solidify to obtain a sealing member, wherein the sealing member surrounded by the first air hole is a protrusion.

19. The method according to claim 18, characterized in that The core body includes a full tab. In step S1, a second liquid packaging material is coated on the surface of the full tab.

20. The method according to claim 18, characterized in that After step S2, the method further includes: S3, discharging the gas in the cavity formed by the shell and the sealing member; S4, injecting a third liquid packaging material into the first sealing portion of the shell, and waiting for the third liquid packaging material to solidify to obtain a sealing member.

21. The method according to claim 18, characterized in that After step S2, the method further includes: S5, placing the PCBA circuit board in the housing, pouring a fourth liquid packaging material into the PCBA circuit board, and waiting for the fourth liquid packaging material to solidify to obtain a sealing member.

22. A battery, characterized in that , including a cylindrical battery as described in any one of claims 1-17.

23. An electrical device, characterized in that , comprising a cylindrical battery as described in claim 22, wherein the battery is used to provide electrical energy.

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