A cylindrical battery and battery module

Abstract

This invention discloses a cylindrical battery and a battery module. The cylindrical battery includes: a casing; a battery cell disposed within the casing, the battery cell having a first tab and a second tab with the opposite polarity to the first tab, the first tab and the second tab being located on the same end face of the battery cell; a cap assembly connected to the casing, the cap assembly including a first cap, a second cap, and an insulating member, the first cap and the second cap being insulatedly connected through the insulating member and forming an integral structure, the first cap being connected to the first tab, and the second cap being connected to the second tab; and an insulating barrier disposed between the first tab and the second tab; effectively isolating the first tab and the second tab, preventing contact between the first tab and the second tab located on the same end face of the battery cell from causing a short circuit in the battery, and effectively improving the safety of the battery.

Description

Technical Field

[0001] This invention relates to the field of battery and battery manufacturing technology, specifically a cylindrical battery and battery module. Background Technology

[0002] Lithium-ion batteries are batteries that contain lithium (including metallic lithium, lithium alloys, lithium ions, and lithium polymers) in their electrochemical system. Lithium-ion batteries have advantages such as small size, large capacity, long lifespan, low self-discharge rate, no memory effect, and environmental friendliness, and are currently widely used in commercial vehicles, special-purpose vehicles, electric bicycles, energy storage systems, and medical devices.

[0003] The positive and negative tabs of existing batteries can be led out from the two ends of the cell respectively, or the positive and negative tabs can be set on the same end face of the cell. However, the positive and negative tabs located on the same end face of the cell are close to each other, which makes it easy for them to touch during use, thus causing the battery to short circuit. Summary of the Invention

[0004] One of the objectives of this invention is to provide a cylindrical battery that can prevent short circuits caused by contact between the positive and negative tabs located on the same end face of the cell.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A cylindrical battery, comprising:

[0007] case;

[0008] A battery cell is disposed within the housing. The battery cell is provided with a first electrode and a second electrode with the opposite polarity to the first electrode. The first electrode and the second electrode are located on the same end face of the battery cell.

[0009] A cap assembly is connected to the housing. The cap assembly includes a first cap, a second cap, and an insulating member. The first cap and the second cap are insulated and connected through the insulating member to form an integral structure. The first cap is connected to the first electrode tab, and the second cap is connected to the second electrode tab.

[0010] An insulating barrier is disposed between the first electrode tab and the second electrode tab.

[0011] An improvement to a cylindrical battery according to the present invention includes an insulating barrier comprising a first connecting portion and a second connecting portion. The first connecting portion and the second connecting portion are arranged perpendicularly. One end of the first connecting portion is connected to the second connecting portion. One end of the second connecting portion extends along the x-direction toward the first electrode to form a space for accommodating the first electrode. The other end of the second connecting portion extends along the y-direction toward the second electrode to form a space for accommodating the second electrode.

[0012] An improvement to a cylindrical battery according to the present invention is provided in which a first latch and a second latch are respectively provided on both sides of the first connecting part, the first electrode tab is engaged with the first latch, and the second electrode tab is engaged with the second latch.

[0013] The present invention provides an improvement to a cylindrical battery, wherein the second connecting part is made of a high-temperature resistant material.

[0014] The present invention provides an improvement to a cylindrical battery, wherein both ends of the first connecting portion are provided with reinforcing structures.

[0015] The present invention provides an improvement to a cylindrical battery, wherein the reinforcing structure is configured as an arc shape.

[0016] The present invention provides an improvement to a cylindrical battery in which the first connecting part and the second connecting part are either separate or integral structures.

[0017] An improvement to the cylindrical battery according to the present invention includes a receiving groove at the bottom of the insulating member, and the other end of the first connecting portion is disposed in the receiving groove.

[0018] The present invention provides an improvement to a cylindrical battery, wherein the insulating component and the first connecting portion are integrally formed.

[0019] An improvement to a cylindrical battery according to the present invention includes a plurality of nanopores on the surface of the first cap and / or the second cap connected to the insulating member, wherein the insulating member is partially embedded in the nanopores.

[0020] An improvement to the cylindrical battery described in this invention includes an insulating seal between the casing and the cap assembly.

[0021] The present invention provides an improvement to a cylindrical battery, wherein the insulating seal is integrally formed with the insulating component.

[0022] Another object of the present invention is to provide a battery module comprising a plurality of cylindrical batteries as described above.

[0023] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0024] A cylindrical battery is disclosed, comprising a casing, a cell, a cap assembly, and an insulating barrier. The cell has a first tab and a second tab with the opposite polarity. The first and second tabs are located on the same end face of the cell. The cap assembly includes a first cap, a second cap, and an insulating barrier. The first cap is connected to the first tab, and the second cap is connected to the second tab. The first cap is insulated from the second cap by the insulating barrier, effectively preventing short circuits caused by contact between the first and second caps. The insulating barrier is located between the first and second tabs, effectively isolating them and preventing short circuits caused by contact between the first and second tabs located on the same end face of the cell, thus effectively improving battery safety.

[0025] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is one of the exploded schematic diagrams of the battery module of the present invention.

[0028] Figure 2 This is the second exploded view of the battery module of the present invention.

[0029] Figure 3 This is a schematic diagram of the structure of the present invention.

[0030] Figure 4 This is an exploded structural diagram of the present invention.

[0031] Figure 5 This is one of the cross-sectional structural schematic diagrams of the present invention.

[0032] Figure 6 for Figure 5 Enlarged view of point A in the middle.

[0033] Figure 7 This is the second cross-sectional structural schematic diagram of the present invention.

[0034] Figure 8 for Figure 7 Enlarged view of point B in the middle.

[0035] Figure 9 This is the third cross-sectional structural schematic diagram of the present invention.

[0036] Figure 10 for Figure 9 A magnified view of point C in the middle.

[0037] Figure 11 This is one of the structural schematic diagrams of the insulating barrier of the present invention.

[0038] Figure 12 This is one or two schematic diagrams of the insulating barrier of the present invention.

[0039] Figure 13 This is a schematic diagram of the housing structure of the present invention.

[0040] Figure 14 This is a schematic diagram of the battery cell structure of the present invention.

[0041] Figure 15 This is a schematic diagram of the cap assembly of the present invention.

[0042] Figure 16 This is another structural schematic diagram of the present invention.

[0043] Figure 17 for Figure 16 A schematic diagram of the structure at point D.

[0044] Figure 18 This is a top view of the structure of the present invention.

[0045] Figure label:

[0046] 100. Shell; 110. Crimped edge; 120. Press-fit part; 130. Side wall; 140. Bottom wall;

[0047] 200, Cap assembly; 210, First cap; 220, Second cap; 230, Insulator; 232, Protrusion;

[0048] 300, battery cell; 310, first tab; 320, second tab;

[0049] 400. Insulating barrier; 410. First connecting part; 411. Reinforcing structure; 412. Receiving groove; 420. Second connecting part; 421. First bayonet; 422. Second bayonet;

[0050] 500. Insulating seals;

[0051] 60°, x direction;

[0052] 700, y direction;

[0053] 800. Battery module; 810. Housing. Detailed Implementation

[0054] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present invention by way of example, but should not be used to limit the scope of the present invention, that is, the present invention is not limited to the described embodiments.

[0055] In the description of this invention, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicating orientation or positional relationships are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0056] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] In this application, the battery may include lithium-ion secondary battery, lithium-ion primary battery, lithium-sulfur battery, sodium lithium-ion battery, sodium-ion battery or magnesium-ion battery, etc., and the embodiments of this application are not limited to this.

[0058] The battery module 800 mentioned in the embodiments of this application refers to a single physical module that includes one or more batteries to provide higher voltage and capacity. For example, the battery module 800 mentioned in this application may include a battery module or a battery pack. The battery module 800 generally includes a housing 810 for encapsulating one or more batteries. The housing 810 can prevent liquids or other foreign objects from affecting the charging or discharging of the batteries.

[0059] The development of battery technology must take into account multiple design factors, such as energy density, cycle life, discharge capacity, charge / discharge rate and other performance parameters. In addition, battery safety also needs to be considered.

[0060] Many factors affect battery safety, and a short circuit is one of the main ones. For example, when a battery short-circuits, it generates a very large current and a lot of heat. The heat and excessive release of electrical energy can severely damage the battery's lifespan, and in severe cases, it can cause the battery container to explode due to excessive pressure, or even cause a fire.

[0061] When the battery cell 300 has a positive and a negative tab on the same side, the existing battery cap assembly 200 generally includes a cover, a positive terminal, and a negative terminal. The positive and negative terminals are respectively set on the cover, and injection molded parts are provided between the positive and negative terminals and the cover. The injection molded parts insulate the positive and negative terminals from the cover respectively.

[0062] The inventors discovered that the arrangement of the positive and negative terminals in the existing cap assembly 200 increases the manufacturing difficulty of the cap assembly 200, making it more difficult to manufacture. Furthermore, the arrangement of the positive and negative terminals increases the overall height of the cap assembly 200, thereby increasing the battery's height space and consequently reducing the battery's energy density. Therefore, the inventors redesigned the cap assembly 200. Please refer to [link / reference]. Figure 15 The designed cap assembly 200 includes a first cap 210, a second cap 220, and an insulating member 230. The first cap 210 and the second cap 220 have opposite polarities. The first cap 210 is insulated from the second cap 220 through the insulating member 230, thereby effectively giving the cap assembly 200 different polarities. At the same time, it eliminates the need for processing the pole post and the equipment for processing the pole post, thereby improving the processing efficiency of the cap assembly 200 and reducing costs.

[0063] However, the inventors discovered that when the first cap 210 and the second cap 220 are connected to the corresponding polarity tabs, the distance between the first cap 210 and the second cap 220 is relatively close, which makes the distance between the corresponding polarity tabs connected to them relatively close. This makes it easy for the tabs of different polarities to touch, which in turn causes the battery to short circuit.

[0064] In view of this, the present invention provides a technical solution by setting an insulating barrier 400 between two tabs of different polarities to insulate the two tabs of different polarities, thereby preventing short circuits in the battery caused by easy contact between the tabs of different polarities during use, and effectively improving the safety of the battery.

[0065] The technical solutions described in the embodiments of this application are applicable to a cylindrical battery and a battery module 800.

[0066] For some embodiments of the battery module 800 provided in this application, please refer to [link / reference]. Figures 1-2 The battery module 800 includes a housing 810 and a battery, with the battery housed within the housing 810.

[0067] The housing 810 is used to house the battery, and the housing 810 can have various structures. In some embodiments, the housing 810 may include a first housing portion and a second housing portion, which overlap each other, and together define a housing space for housing the battery. The second housing portion may also be a hollow structure with one end open, and the first housing portion may be a plate-like structure, with the first housing portion covering the open side of the second housing portion to form a housing 810 with a housing space; alternatively, both the first and second housing portions may be hollow structures with one side open, with the open side of the first housing portion covering the open side of the second housing portion to form a housing 810 with a housing space. Of course, the first and second housing portions can be various shapes, such as cylinders, cuboids, etc.

[0068] To improve the sealing performance after the first housing part and the second housing part are connected, a sealing element, such as sealant or sealing ring, can also be installed between the first housing part and the second housing part.

[0069] Assuming the first box section is fitted onto the top of the second box section, the first box section can also be called the upper box cover, and the second box section can also be called the lower box section.

[0070] In a battery, there can be one or more batteries. If there are multiple batteries, they can be connected in series, parallel, or a combination thereof. A combination thereof means that multiple batteries are connected in both series and parallel. Multiple batteries can be directly connected in series, parallel, or a combination thereof, and then the whole assembly of multiple batteries is housed in the housing 810. Alternatively, multiple batteries can first be connected in series, parallel, or a combination thereof to form a battery module, and then multiple battery modules can be connected in series, parallel, or a combination thereof to form a whole assembly, which is then housed in the housing 810.

[0071] In some embodiments, there are multiple batteries, which are first connected in series, parallel, or mixed to form a battery module. The multiple battery modules are then connected in series, parallel, or mixed to form a whole and housed in the housing 810.

[0072] Multiple batteries in a battery module can be electrically connected through a busbar component to achieve parallel, series, or mixed connection of multiple batteries in the battery module.

[0073] Please see Figures 3-4The cylindrical battery provided in some embodiments of this application includes: a housing 100; a battery cell 300 disposed within the housing 100, the battery cell 300 having a first tab 310 and a second tab 320 with the opposite polarity to the first tab 310, the first tab 310 and the second tab 320 being located on the same end face of the battery cell 300; a cap assembly 200 connected to the housing 100, the cap assembly 200 including a first cap 210, a second cap 220, and an insulating member 230, the first cap 210 and the second cap 220 being insulatedly connected through the insulating member 230 and forming an integral structure, the first cap 210 being connected to the first tab 310, and the second cap 220 being connected to the second tab 320; and an insulating barrier 400 disposed between the first tab 310 and the second tab 320.

[0074] Compared with the prior art, some embodiments of this application provide a cylindrical battery, which, through the cooperative use of a casing 100, a cell 300, a cap assembly 200, and an insulating barrier 400, provides a first tab 310 and a second tab 320 with opposite polarity to the first tab 310. The first tab 310 and the second tab 320 are located on the same end face of the cell 300. The cap assembly 200 includes a first cap 210, a second cap 220, and an insulating barrier 230. The first cap 210 and the first tab 310 are connected. The second cap 220 is connected to the second tab 320. The first cap 210 is insulated from the second cap 220 by an insulating member 230, which effectively prevents the first cap 210 and the second cap 220 from coming into contact and causing a short circuit in the battery. The insulating barrier 400 is disposed between the first tab 310 and the second tab 320, which effectively isolates the first tab 310 and the second tab 320 and prevents the first tab 310 and the second tab 320 located on the same end face of the cell 300 from coming into contact and causing a short circuit in the battery, thus effectively improving the safety of the battery.

[0075] In some embodiments of this application, the cap assembly 200 can be either insulated from or electrically connected to the housing 100. Please refer to [link to relevant documentation]. Figure 3 Both the first cap 210 and the second cap 220 are in contact with the housing 100. To prevent a short circuit caused by simultaneous conductive contact between the first cap 210 and the second cap 220 and the housing 100, the first cap 210 and the second cap 220 need to be insulated from the housing 100 respectively; that is, the cap assembly 200 needs to be insulated from the housing 100. Please refer to [link to relevant documentation]. Figure 16-18 The housing 100 is in contact only with the first cap 210. The first cap 210 is insulated from the second cap 220 by the insulating member 230. The first cap 210, the insulating member 230 and the second cap 220 are arranged in concentric circles. The housing 100 can be directly electrically connected to the first cap 210 without the need for insulation.

[0076] In some embodiments of this application, the housing 100 is a hollow structure with an opening on one side. A cap assembly 200 covers the opening of the housing 100 and forms a sealed, insulated connection, creating a cavity for accommodating the battery cell 300 and electrolyte. The insulated connection between the housing 100 and the cap assembly 200 effectively prevents short circuits caused by contact between the housing 100 and the cap assembly 200.

[0077] The housing 100 in this embodiment of the invention is a cylinder.

[0078] For example, please refer to Figure 13 The housing 100 includes a sidewall 130 and a bottom wall. The sidewall 130 surrounds the outside of the battery cell 300, and the bottom wall is connected to the end of the sidewall 130. The sidewall 130 has a cylindrical structure, and the bottom wall has a plate-like structure, the shapes of which correspond to the shapes of the sidewall 130. Optionally, one end of the sidewall 130 forms an opening, and the bottom wall is connected to the other end of the sidewall 130 opposite to the opening.

[0079] The side wall 130 and the bottom wall can be integrally formed, meaning the shell 100 is a single-piece component. Alternatively, the side wall 130 and the bottom wall can be two separate components, which can then be joined together by welding, riveting, bonding, or other methods.

[0080] The side wall 130 includes a rolled edge portion 110 formed at the lower part of the cap assembly 200 and an inwardly bent crimping portion 120 formed at the upper part of the cap assembly 200. Before battery sealing, the rolled edge portion 110 needs to be provided on the side wall 130 of the housing 100 to prepare for battery sealing. After battery sealing, the inwardly bent crimping portion 120 at the upper part of the cap assembly 200 is formed on the side wall 130 of the housing 100.

[0081] It should be noted that the explosion-proof valve of this application is located at the bottom of the housing 100. The explosion-proof valve can be formed at the bottom of the housing 100 by laser etching or laser welding. The pattern of laser etching can be set as arc, triangle, square, trapezoid, ellipse, wavy line, etc., and can be selected according to actual needs when using it.

[0082] Please see Figure 14 The battery cell 300 provided in some embodiments of this application includes: a first electrode, a second electrode, and a separator. The separator is disposed between the first electrode and the second electrode. The first electrode, the separator, and the second electrode can be stacked or wound to form the battery cell 300. A first tab 310 is disposed on the first electrode, and a second tab 320 is disposed on the second electrode.

[0083] When the first or second electrode is a positive electrode, it includes a positive current collector and a positive active material layer coated on the surface of the current collector. The current collector includes a positive coating area and a positive electrode tab connected to the coating area. The coating area is coated with the positive active material layer, while the tab is not coated with the positive active material layer. Taking a lithium-ion battery as an example, the material of the current collector can be aluminum, and the positive active material layer includes positive active material, which can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. When the first or second electrode is a negative electrode, it includes a negative current collector and a negative active material layer coated on the surface of the current collector. The current collector includes a negative coating area and a negative electrode tab connected to the coating area. The coating area is coated with the negative active material layer, while the tab is not coated with the negative active material layer. The negative electrode current collector can be made of copper, and the negative electrode active material layer includes a negative electrode active material, which can be carbon or silicon, etc. The separator can be made of PP (polypropylene) or PE (polyethylene), etc.

[0084] It should be noted that the first electrode 310 and the first cap 210 can be directly or indirectly connected, and the second electrode 320 and the second cap 220 can be directly or indirectly connected. When indirectly connected, the first electrode 310 can be connected to the first cap 210 through the adapter piece of the first electrode 310, and the second electrode 320 can be connected to the second cap 220 through the adapter piece of the second electrode 320. The material of the adapter piece can be the same as or different from the material of the first cap 210, the second cap 220, the first electrode 310, and the second electrode 320.

[0085] It should be noted that at least one of the first tab 310 and the second tab 320 is provided. When the first tab 310 or the second tab 320 is the positive electrode, the first tab 310 or the second tab 320 is made of aluminum. When the first tab 310 or the second tab 320 is the negative electrode, the first tab 310 or the second tab 320 is made of copper, copper plated with nickel, or aluminum on top and copper on the bottom.

[0086] It should be noted that the first tab 310 can be set on the first electrode by welding, or the first tab 310 can be directly die-cut from the first electrode by die-cutting; the second tab 320 can be set on the second electrode by welding, or the second tab 320 can be directly die-cut from the second electrode by die-cutting.

[0087] For some embodiments of the insulating barrier 400 provided in this application, please refer to [link / reference]. Figures 5-8It includes a first connecting part 410 and a second connecting part 420. The first connecting part 410 and the second connecting part 420 are arranged perpendicularly. One end of the first connecting part 410 is connected to the second connecting part 420. One end of the second connecting part 420 extends along the x direction 600 toward the first electrode 310 to form a space for accommodating the first electrode 310. The other end of the second connecting part 420 extends along the y direction 700 toward the second electrode 320 to form a space for accommodating the second electrode 320. With the first connecting part 410 and the second connecting part 420 arranged perpendicularly, the first connecting part 410 is used to isolate the first tab 310 and the second tab 320, preventing the first tab 310 from contacting the second tab 320 and causing a short circuit in the battery. One end of the second connecting part 420 extends towards the first tab 310 along the x direction 600 to form a space for accommodating the first tab 310, and the other end of the second connecting part 420 extends towards the second tab 320 along the y direction 700 to form a space for accommodating the second tab 320. This effectively restricts the position of the first tab 310 and the second tab 320, preventing the first tab 310 and the second tab 320 from being inserted backwards into the battery cell 300, thereby causing a short circuit in the battery cell 300. At the same time, the bottom of the second connecting part 420 abuts against the battery cell 300, effectively restricting the position of the battery cell 300 and preventing displacement of the battery cell 300.

[0088] In some embodiments of this application, the first connecting portion 410 and the second connecting portion 420 are either separate or integral structures. By providing the first connecting portion 410 and the second connecting portion 420, they can be either separate or integral structures. When the first connecting portion 410 and the second connecting portion 420 are separate structures, they can be sequentially assembled into the housing 100, facilitating their installation. When the first connecting portion 410 and the second connecting portion 420 are integral structures, they do not need to be processed separately, reducing processing costs and improving processing efficiency.

[0089] It should be noted that the multiple tabs of the 300 battery cell are generally produced by bending or flattening. Compared with bending, the flattening process results in fewer cases where the tabs of the 300 battery cell are inserted upside down.

[0090] Please see Figures 11-12In some embodiments of this application, the second connecting portion 420 is provided on both sides of the first connecting portion 410, with a first latch 421 and a second latch 422 respectively. The first tab 310 is engaged with the first latch 421, and the second tab 320 is engaged with the second latch 422. Through the arrangement of the first latch 421 and the second latch 422, the first tab 310 is engaged with the first latch 421, and the second tab 320 is engaged with the second latch 422. This effectively clamps the first tab 310 with the first latch 421 and the second tab 320 with the second latch 422, thereby preventing the first tab 310 and the second tab 320 from becoming loose and causing the loose parts of the first tab 310 and the second tab 320 to be inserted backwards into the battery cell 300, thus preventing a short circuit in the battery.

[0091] Please see Figures 9-10 In some embodiments of this application, the first connecting portion 410 is provided with reinforcing structures 411 at both ends. By providing reinforcing structures 411 at both ends of the first connecting portion 410, the structural strength of the first connecting portion 410 is improved. At the same time, the reinforcing structures 411 can also effectively prevent the first tab 310 and the second tab 320 from contacting each other, thus preventing a short circuit in the battery and improving the isolation effect of the second connecting portion 420 on the first tab 310 and the second tab 320.

[0092] The reinforcing structure 411 provided in some embodiments of this application is configured as an arc shape. By configuring the reinforcing structure 411 as an arc shape, the arc-shaped reinforcing structure 411 can effectively buffer the first electrode 310 and the second electrode 320 when it comes into contact with them, thereby effectively protecting the first electrode 310 and the second electrode 320.

[0093] In some embodiments of this application, the second connection portion 420 is made of a high-temperature resistant material. By using a high-temperature resistant material for the second connection portion 420, it is prevented from being ignited when the battery temperature is high due to the low ignition point of the second connection portion 420, thus affecting the safety performance of the battery.

[0094] In some embodiments of this application, the bottom of the insulating member 230 is provided with a receiving groove 412, and the other end of the first connecting part 410 is disposed in the receiving groove 412. By providing the receiving groove 412, which is located at the bottom of the insulating member 230, and the other end of the first connecting part 410 is disposed in the receiving groove 412, the first connecting part 410 and the insulating member 230 are effectively connected, thereby restricting the position of the first connecting part 410 and preventing it from sliding within the housing 100.

[0095] It should be noted that the cross-sectional shape of the receiving groove 412 can be one of the following: circular, square, triangular, trapezoidal, pentagonal, or hexagonal. Among them, the connection strength between the circular, trapezoidal, pentagonal, or hexagonal receiving groove 412 and the first connecting part 410 is better than that of the square or triangular receiving groove 412. When using it, it can be set according to actual needs.

[0096] It should be noted that the connection methods between the first connecting part 410 and the receiving groove 412 include, but are not limited to, bonding, riveting, bolting, and snap-fitting.

[0097] In some embodiments of this application, the insulating member 230 and the first connecting portion 410 are integrated into one structure. By integrating the insulating member 230 and the first connecting portion 410 into one structure, the first connecting portion 410 and the insulating member 230 do not need to be processed separately, reducing processing costs and improving processing efficiency.

[0098] In some embodiments of this application, the surfaces where the first cap 210 and / or the second cap 220 connect to the insulator 230 are provided with multiple nanopores, and the insulator 230 is partially embedded in the nanopores. By setting the nanopores on the surfaces where the first cap 210 and / or the second cap 220 connect to the insulator 230, and with the insulator 230 partially embedded in the nanopores, the bonding force between the first cap 210, the second cap 220, and the insulator 230 is enhanced, and good airtightness is ensured at the connection points between the first cap 210, the second cap 220, and the insulator 230, thereby improving the airtightness of the battery.

[0099] It should be noted that the pore size, depth, and distance between adjacent pores of the nanopores can be adjusted according to actual needs.

[0100] It should be noted that the first cap 210 and / or the second cap 220 of this invention can form multiple nanopores through laser engraving or chemical etching. Furthermore, compared to conventional chemical etching, laser engraving offers faster pore-forming speed, higher efficiency, and is more environmentally friendly. The desired nanopore morphology, pore size, and pore density can be obtained by adjusting the engraving parameters. Moreover, the insulating component 230 is one of PP, PE, or PPS.

[0101] An insulating seal 500 is provided between the housing 100 and the cap assembly 200 in some embodiments of this application. The insulating seal 500 effectively insulates the housing 100 and the cap assembly 200, while enhancing the sealing effect between them and preventing battery leakage.

[0102] Furthermore, the insulating seal 500 and the insulating component 230 are integrally formed. When the insulating seal 500 and the insulating component 230 are integrally formed, space needs to be reserved between the insulating seal 500 and the insulating component 230 for installing the first cap 210 and the second cap 220, so as to ensure that the first tab 310 is connected to the first cap 210 and the second tab 320 is connected to the second cap 220.

[0103] It should be noted that the surfaces where the housing 100, the cap assembly 200 and the insulating seal 500 are connected can be sealed by nano-processing, or by bonding the insulating seal 500 between the housing 100 and the cap assembly 200. In addition, nano-processing can effectively improve the bonding strength between the housing 100, the cap assembly 200 and the insulating seal 500, and further improve the airtightness between the housing 100 and the cap assembly 200.

[0104] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A cylindrical battery, characterized in that, include: case; A battery cell is disposed within the housing. The battery cell is provided with a first electrode and a second electrode with the opposite polarity to the first electrode. The first electrode and the second electrode are located on the same end face of the battery cell. A cap assembly is connected to the housing. The cap assembly includes a first cap, a second cap, and an insulating member. The first cap and the second cap are insulated and connected through the insulating member to form an integral structure. The first cap is connected to the first electrode tab, and the second cap is connected to the second electrode tab. An insulating barrier is disposed between the first electrode tab and the second electrode tab; The insulating barrier includes a first connecting part and a second connecting part. The first connecting part and the second connecting part are arranged perpendicularly. One end of the first connecting part is connected to the second connecting part. The bottom of the second connecting part abuts against the battery cell. One end of the second connecting part extends along the x-direction toward the first electrode to form a space for accommodating the first electrode. The other end of the second connecting part extends along the y-direction toward the second electrode to form a space for accommodating the second electrode. The second connecting part is provided with a first bayonet and a second bayonet on both sides of the first connecting part. The first electrode tab is engaged with the first bayonet, and the second electrode tab is engaged with the second bayonet.

2. A cylindrical battery as described in claim 1, characterized in that, The second connecting part is made of high temperature resistant material.

3. A cylindrical battery as described in claim 1, characterized in that, Both ends of the first connecting part are provided with reinforcing structures.

4. A cylindrical battery as described in claim 3, characterized in that, The reinforcing structure is configured as an arc shape.

5. A cylindrical battery as described in claim 1, characterized in that, The first connecting part and the second connecting part are either separate structures or an integral structure.

6. A cylindrical battery as described in claim 1, characterized in that, The bottom of the insulating component is provided with a receiving groove, and the other end of the first connecting part is disposed in the receiving groove.

7. A cylindrical battery as described in claim 6, characterized in that, The insulating component and the first connecting part are an integral structure.

8. A cylindrical battery as described in claim 1, characterized in that, The surface of the first cap and / or the second cap that is connected to the insulating element has multiple nanopores, and the insulating element is partially embedded in the nanopores.

9. A cylindrical battery as described in claim 1, characterized in that, An insulating seal is provided between the housing and the cap assembly.

10. A cylindrical battery as described in claim 9, characterized in that, The insulating seal is integrally formed with the insulating component.

11. A battery module, characterized in that, The invention includes a cylindrical battery as described in any one of claims 1-10.

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