Battery cover plate and battery

Abstract

In order to solve the problems that an existing battery cover plate is complex in structure, large in number of parts, complex in machining process flow and large in thickness, the invention provides a battery cover plate and a battery, the battery cover plate comprises a cover plate body, a lead-out piece and an insulating part, the cover plate body is provided with a first through hole, and the lead-out piece is embedded into the first through hole; the insulating part is arranged between the leading-out sheet and the cover plate body and used for isolating the leading-out sheet from the cover plate body, and the thickness of the cover plate body ranges from 4 mm to 16 mm; the battery cover plate is simple in structure, the overall thickness of the battery cover plate can be extremely thin, and the battery cover plate is suitable for extremely thin batteries; the insulation part is filled between the leading-out sheet and the cover plate body in an injection molding mode, so that the insulation effect is achieved, the leading-out sheet and the cover plate body are connected into a whole, relative torsion of the leading-out sheet and the cover plate body in the using process is avoided, related anti-torsion structures are reduced, and components and related processing technological processes are saved.

Description

Technical Field

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

[0002] With the continuous expansion of the new energy industry, lithium-ion batteries have been more widely used as an important part of the new energy industry. Square aluminum shell lithium-ion batteries are widely used in the field of power and energy storage batteries due to their simple structure, high energy density and high safety performance. However, the existing battery cover plate has a complex structure, many components, and a complex processing process, which leads to a thick battery cover plate and cannot meet the application of ultra-thin batteries; therefore, how to overcome the above-mentioned technical problems and defects has become a key issue that needs to be solved. Summary of the invention

[0003] In view of the problems that the existing battery cover plate has a complex structure, many components, a complex processing process and a relatively thick thickness, the present invention provides a battery cover plate and a battery.

[0004] The technical solution adopted by the present invention to solve the above technical problems is as follows:

[0005] On one hand, the present invention provides a battery cover, which is used to close a battery shell to form a battery. The battery cover includes a cover body, a lead-out piece and an insulating member. The cover body is provided with a first through hole, and the lead-out piece is embedded in the first through hole. The insulating member is arranged between the lead-out piece and the cover body to isolate the lead-out piece from contact with the cover body. The thickness direction of the battery is the thickness direction of the cover body, and the thickness range of the cover body is 4mm-16mm.

[0006] Optionally, a cross section of the cover plate body perpendicular to the lead-out direction of the lead-out piece is a trapezoidal cross section, and an angle between a lower base and a waist of the trapezoidal cross section ranges from 10° to 45°.

[0007] Optionally, the angle between the lower base and the waist of the trapezoidal cross-section is the thinnest part of the cover body, and the thickness of the thinnest part of the cover body is 0.1mm-0.4mm.

[0008] Optionally, the thickness direction of the lead-out piece is taken as the thickness direction of the battery, and the thickness range of the lead-out piece is 0.5-10 mm.

[0009] Optionally, the length direction of the lead-out piece is along the length direction of the cover body, and the ratio of the length of the lead-out piece to the length of the cover body is 0.3-0.9:1; the cross-sectional area of ​​the lead-out piece is set to S, the current passing through the lead-out piece is A, and the relationship between S and A is: S=20%A-40%A.

[0010] Optionally, along the width direction of the cover body, the lead-out piece is provided with a circular hole connecting both sides of the lead-out piece, the lead-out piece passes through the first through hole of the cover body, and the first end of the lead-out piece and the second end of the lead-out piece extend from both sides of the first through hole respectively, the first end extends from the first through hole to the outside of the battery, the second end extends from the first through hole to the inside of the battery, and the circular hole is located on the inner side of the first through hole.

[0011] Optionally, a first annular groove is provided inside the insulating member at one side close to the second end of the lead-out piece.

[0012] Optionally, a single lead-out piece, a single insulating member, and a single first through hole are provided on a single battery cover plate.

[0013] Optionally, two or more lead-out pieces, two or more insulating pieces, and two or more first through holes are provided on a single battery cover plate, and the two or more lead-out pieces, two or more insulating pieces, and two or more first through holes are provided in a one-to-one correspondence.

[0014] Another aspect of the present invention provides a battery, comprising the battery cover mentioned above.

[0015] Compared with the prior art, the battery cover provided by the present invention has the following main effects:

[0016] (1) The battery cover of the present invention only has three parts, namely, the cover body, the lead-out sheet and the insulating member, and does not have the traditional liquid injection hole and explosion-proof valve. The structure is simple, and the thickness of each part can be effectively controlled. Therefore, the overall thickness of the battery cover of the present invention can be extremely thin, and the thickness of the cover body can be as thin as 4 mm. Therefore, the battery cover of the present invention can be suitable for extremely thin batteries;

[0017] (2) The present invention provides an insulating member in the first through hole of the cover body, thereby isolating the lead-out plate from the cover body, avoiding contact between the lead-out plate and the cover body, and achieving a technical effect of insulating the lead-out plate and the cover body;

[0018] (3) The insulating member of the present invention is filled between the lead-out plate and the cover plate body by injection molding, so that the lead-out plate and the cover plate body are connected as a whole, thereby preventing the lead-out plate from being twisted relative to the cover plate body during use, thereby reducing the related anti-twist structure;

[0019] (4) The provision of the insulating member of the present invention not only has the technical effect of isolating the lead-out plate from the cover plate body, but also connects the lead-out plate and the cover plate body into a whole, thus providing the technical effect of an anti-twist structure. Thus, the provision of the insulating member of the present invention reduces the use of insulating members and / or anti-twist structures, making the structure of the battery cover of the present invention simple, with fewer components, and at the same time, the processing method is simple, the processing cost is low, components and related processing processes are saved, and the use effect is good;

[0020] (5) The extended structures on both sides of the cover body can be sealed and fitted with the battery shell by welding, ensuring the sealing and safety of the battery, thereby improving the safe use performance of the battery cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of a battery cover provided by an embodiment of the present invention;

[0022] Figure 2 is an exploded schematic diagram of a battery cover provided by an embodiment of the present invention;

[0023] Figure 3 It is a structural schematic diagram of an insulating member in a battery cover provided by an embodiment of the present invention;

[0024] Figure 4 is a schematic top view of a battery cover provided by an embodiment of the present invention;

[0025] Figure 5 yes Figure 4 Schematic diagram of the cross section of AA;

[0026] Figure 6 is a schematic top view of a battery cover provided by another embodiment of the present invention;

[0027] Figure 7 is a front view schematic diagram of a battery cover provided by another embodiment of the present invention;

[0028] The reference numerals in the drawings of the specification are as follows:

[0029] 1-cover body; 11-first through hole; 12-sealing groove; 2-lead plate; 21-circular hole; 3-insulating member; 31-first insulating member; 311-first annular groove; 312-first plane portion; 313-first annular portion; 314-second through hole; 32-second insulating member; 33-third insulating member; 331-second annular groove; 332-second plane portion; 333-second annular portion; 334-raised portion; 335-sealing portion; 336-extension portion; 337-third through hole. DETAILED DESCRIPTION

[0030] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] In the description of the present invention, it should be understood that the terms "side", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the 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 cannot be understood as limiting the present invention. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] like Figure 1-2 As shown, in one embodiment, the present invention provides a battery cover on one hand, the battery cover is used to close the battery shell to form a battery, the battery cover includes a cover body 1, a lead-out piece 2 and an insulating member 3, the cover body 1 is provided with a first through hole 11, the lead-out piece 2 is embedded in the first through hole 11, the insulating member 3 is arranged between the lead-out piece 2 and the cover body 1 to isolate the lead-out piece 2 from contact with the cover body 1, the thickness direction of the battery is the thickness direction of the cover body 1, and the thickness range of the cover body 1 is 4mm-16mm.

[0034] In some embodiments, the lead-out piece 2 and the cover body 1 are both metal parts. The lead-out piece 2 and the cover body 1 are isolated from each other by setting an insulating member 3 in the first through hole 11 to prevent them from contacting each other. The insulating member 3 of the present invention is filled between the lead-out piece 2 and the cover body 1 by injection molding, which not only has the effect of isolation and insulation, but also connects the lead-out piece 2 and the cover body 1 as a whole, thereby preventing the lead-out piece 2 from twisting relative to the cover body 1 during use, reducing the related anti-twisting structure, saving components and related processing procedures, and thus improving the safe use performance of the battery cover.

[0035] In a preferred embodiment, the thickness of the cover body 1 is 4 mm-12 mm; in a more preferred embodiment, the thickness of the cover body 1 is 7 mm.

[0036] Since the battery cover of the present application has only three components, namely, a cover body 1, a lead-out piece 2 and an insulating member 3, and does not have traditional structures such as a liquid injection hole and an explosion-proof valve, the structure is simple, and the thickness of each component can be effectively controlled. Therefore, the overall thickness of the battery cover of the present application can be made extremely thin, and the thickness of the cover body 1 can be as thin as 4 mm. Therefore, the battery cover of the present application can be suitable for extremely thin batteries.

[0037] like Figure 4 As shown, in one embodiment, the cross section of the cover body 1 perpendicular to the lead-out direction of the lead-out plate 2 is a trapezoidal cross section, and the angle between the bottom and the waist of the trapezoidal cross section ranges from 10° to 45°.

[0038] Specifically, the side surface of the cover body 1 includes two planes and two inclined surfaces. The planes are parallel to the length direction of the cover body 1. The two planes and the two inclined surfaces of the cover body 1 form a trapezoidal shape. The angle range between the planes and the adjacent inclined surfaces is 10°-45°. Preferably, the angle range between the planes and the adjacent inclined surfaces is 20°. When the angle range between the planes and the adjacent inclined surfaces is within the above range, the welding between the cover body 1 and the battery shell is easier to achieve, ensuring the structural stability of the welding between the edge of the cover body 1 and the battery shell, and can ensure the sealing and safety of the battery, thereby improving the safe use performance of the battery cover.

[0039] like Figure 4 As shown, in one embodiment, the angle between the lower base and the waist of the trapezoidal cross section is the thinnest part of the cover body 1, and the thickness of the thinnest part of the cover body 1 is 0.1mm-0.4mm.

[0040] When the thickness of the thinnest part of the cover body 1 is 0.1 mm, the processing cost of the cover body 1 is high, but the welding effect between the edge of the cover body 1 and the battery shell is good;

[0041] When the thickness of the thinnest part of the cover body 1 is 0.4 mm, the processing cost of the cover body 1 is low, but the welding cost between the edge of the cover body 1 and the battery housing is high;

[0042] In a preferred embodiment, the thinnest thickness of the cover body 1 is 0.2 mm. At this time, the processing cost of the cover body 1 is not high, and the welding effect between the edge of the cover body 1 and the battery shell is good.

[0043] When the cover body 1 is welded to the battery housing, the welding sealing line must transition from the cover body 1 and the battery housing to the battery housing and the battery housing. By setting the shape of the cover body 1 to be similar to a trapezoid, it is beneficial to achieve the sealing of the transition area. The inclined surface structure on both sides of the cover body 1 can be sealed and fitted with the battery housing through welding, ensuring the sealing and safety of the battery, thereby improving the safe use performance of the battery cover.

[0044] In one embodiment, the direction from the battery cover to the battery shell is the length direction of the lead-out piece 2, and the length of the lead-out piece 2 is greater than the depth of the first through hole 11. During installation, the lead-out piece 2 passes through the first through hole 11 and the first end of the lead-out piece 2 and the second end of the lead-out piece 2 are respectively located on both sides of the first through hole 11, so that the outer wall of the lead-out piece 2 is connected to the upper surface, the lower surface of the cover body 1 and the inner wall of the first through hole 11 through the insulating member 3, thereby increasing the contact area between the insulating member 3 and the lead-out piece 2 and the cover body 1, improving the connection strength between the lead-out piece 2 and the cover body 1, and connecting the lead-out piece 2 and the cover body 1 as a whole, avoiding relative twisting of the lead-out piece 2 and the cover body 1 during use, reducing the relevant anti-twist structure, saving components and relevant processing flow, thereby improving the safe use performance of the battery cover.

[0045] like Figure 1-2 As shown, in one embodiment, the length direction of the lead-out piece 2 is the length direction of the cover body 1, and the ratio of the length of the lead-out piece 2 to the length of the cover body 1 is 0.3-0.9:1; the cross-sectional area of ​​the lead-out piece 2 is set to S, and the current passing through the lead-out piece 2 is A, and the relationship between S and A is: S = 20% A-40% A. The cross-section of the lead-out piece 2 in the battery cover is a rectangular structure, and the cross-sectional area S of the lead-out piece 2 is affected by the current of the pole core electrically connected to it. When the current transmitted by the pole core is larger, the cross-sectional area S of the lead-out piece 2 is larger. Similarly, if the current of the pole core is smaller, the cross-sectional area of ​​the lead-out piece 2 is smaller. Therefore, when the current flowing through the lead-out piece 2 is A, the cross-sectional area S of the lead-out piece 2 is between 20%-40% of A, which can meet the current conduction requirements of the lead-out piece 2. In this embodiment, in order to cater to the extremely thin design of the battery cover, the thickness of the lead-out piece 2 (the thickness of the lead-out piece 2 is based on the thickness direction of the battery) is set to 1mm under the premise of ensuring its structural strength. The length of the lead-out piece 2 can be adaptively designed according to the current required to flow through it. When the current flowing through is larger, the length of the lead-out piece 2 is increased to meet the current requirement under the premise of ensuring that the thickness of the lead-out piece 2 remains unchanged. Of course, the thickness of the lead-out piece 2 can also be designed to be 0.5mm, 1.5mm, 2mm, 2.5mm, etc. Preferably, the thickness of the lead-out piece 2 is in the range of 0.5-10mm, with the thickness direction of the battery as the thickness direction of the lead-out piece 2. When the thickness of the lead-out sheet 2 is less than 0.5 mm, the lead-out sheet 2 and the cover body 1 cannot be effectively insulated by injection molding, and the sealing between the lead-out sheet 2 and the cover body 1 cannot be guaranteed; when the thickness of the lead-out sheet 2 is greater than 10 mm, the thickness of the lead-out sheet 2 is relatively thick; when the battery cover still maintains a thickness of 4 mm-16 mm, the insulating member 3 cannot effectively fix and insulate the cover body 1 and the lead-out sheet 2.

[0046] In a preferred embodiment, the ratio of the length of the lead-out piece 2 to the length of the cover body 1 is 0.33-0.5:1; in a more preferred embodiment, the ratio of the length of the lead-out piece 2 to the length of the cover body 1 is 0.335:1.

[0047] In a preferred embodiment, the relationship between S and A is: S = 30% A-35% A; in a more preferred embodiment, the relationship between S and A is: S = 1 / 3A.

[0048] like Figure 2 As shown, in one embodiment, along the width direction of the cover body 1, the lead-out sheet 2 is provided with a circular hole 21 connecting the two sides of the lead-out sheet 2, the lead-out sheet 2 passes through the first through hole 11 of the cover body 1, and the first end of the lead-out sheet 2 and the second end of the lead-out sheet 2 extend from the two sides of the first through hole 11 respectively, the first end extends from the first through hole 11 to the outside of the battery, and the second end extends from the first through hole 11 to the inside of the battery, and the circular hole 21 is located inside the first through hole 11. The part of the first end of the lead-out sheet 2 of the battery cover extending from the first through hole 11 will extend to the outside of the battery to achieve circuit conduction through other electrical connectors. The part of the second end of the lead-out sheet 2 extending from the first through hole 11 will extend to the inside of the battery shell, and be electrically connected to the pole ear of the pole core in the battery shell by welding and fixing, and the second end of the lead-out sheet 2 is covered by the inner insulating film provided inside the battery shell inside the battery shell, so as to avoid the lead-out sheet 2 from contacting with other metal parts of the battery.

[0049] Specifically, a circular hole 21 is set outside the lead-out plate 2. The circular hole 21 has the function of increasing the strength of the lead-out plate 2. By setting the circular hole 21 outside the lead-out plate 2, when an external force is applied, the external force will act in the circular hole 21 instead of on the insulating member 3, thereby protecting the insulating member 3.

[0050] like Figure 3 and Figure 5 As shown, in one embodiment, the insulating member 3 is provided with a first annular groove 311 inside one side close to the second end of the lead-out piece 2. The first annular groove 311 is provided on the side of the battery cover plate located inside the battery shell. When the battery shell is sealed and connected to the cover plate body 1 of the battery cover plate, the first annular groove 311 is located inside the battery shell. At the same time, the second end of the lead-out piece 2 on one side of the first annular groove 311 is also located inside the battery shell. With such a configuration, the inner insulating layer provided inside the battery shell can extend into the first annular groove 311 of the insulating member 3. The inner insulating layer of the battery extends into the insulating member 3 to completely cover the second end of the lead-out piece 2 located inside the battery shell, thereby satisfying the insulation requirement for the second end of the lead-out piece 2.

[0051] In one embodiment, the insulating member 3 includes a first insulating member 31 . The first insulating member 31 is disposed at one side of the battery. The first insulating member 31 is a first annular groove 311 .

[0052] Specifically, the first annular groove 311 includes a first planar portion 312 and a first annular portion 313. The first planar portion 312 is arranged on at least a portion of the surface of the second end of the lead-out piece 2 protruding from the first through hole 11 and covers a portion of the surface of the second end of the cover body 1. A second through hole is provided at a position corresponding to the first through hole 11 on the first planar portion 312. The first annular portion 313 is connected to the circumference of the first planar portion 312 and extends in a direction perpendicular to the plane where the first planar portion 312 is located.

[0053] The second end of the lead-out piece 2 is provided with a welding area, and the second end of the lead-out piece 2 is welded to the tab of the battery cell by sealing welding.

[0054] Specifically, the sealing welding methods include but are not limited to laser welding, electromagnetic pulse welding, resistance welding, electron beam welding and other welding methods.

[0055] When the lead-out tab 2 is welded to the tab of the battery cell, the inner insulating film outside the battery cell covers the outer side of the lead-out tab 2 and is disposed in the first annular groove 311 .

[0056] Furthermore, the insulating member 3 also includes a second insulating member 32 and a third insulating member 33; the first insulating member 31, the second insulating member 32 and the third insulating member 33 are all annular structures, the first insulating member 31, the second insulating member 32 and the third insulating member 33 are integrally formed, the first insulating member 31 and the third insulating member 33 are respectively located at both ends of the second insulating member 32, and the outer diameters of the first insulating member 31 and the third insulating member 33 are both larger than the outer diameter of the second insulating member 32.

[0057] In one embodiment, the second insulating member 32 is disposed in the circular hole 21, between the outer side of the lead-out plate 2 and the inner side of the first through hole 11 to isolate the outer wall of the lead-out plate 2 from contacting the inner wall of the first through hole 11; the third insulating member 33 is disposed on at least a portion of the surface of the first end of the lead-out plate 2 protruding from the first through hole 11 and covers a portion of the surface of the first end of the cover body 1.

[0058] Specifically, the second insulating member 32 is used to fully fill the gap between the outer side of the lead-out plate 2 and the inner side of the first through hole 11 by injection molding, so that the lead-out plate 2 and the cover plate body 1 are connected as a whole.

[0059] Furthermore, the second insulating member 32 is injection molded in the circular hole 21, and the circular hole 21 increases the contact area of ​​the injection molding, thereby improving the bonding performance between the outer side of the lead-out piece 2 and the inner side of the first through hole 11, thereby avoiding relative twisting of the lead-out piece 2 and the cover body 1 during use, reducing the related anti-twist structure, saving components and related processing procedures, and connecting the lead-out piece 2 and the cover body 1 as a whole, thereby improving the safe use performance of the battery cover.

[0060] In one embodiment, the third insulating member 33 is injection molded on the outside of the first end of the lead-out piece 2 protruding from the first through hole 11 , and the injection molding range is the surface of the first end of the cover body 1 .

[0061] Specifically, the third insulating member 33 includes a second annular groove 331; the second annular groove 331 includes a second planar portion 332 and a second annular portion 333, the second planar portion 332 is arranged on at least a portion of the surface of the first end of the lead-out piece 2 protruding from the first through hole 11 and covers a portion of the surface of the first end of the cover body 1, and the second annular portion 333 is connected to the circumference of the second planar portion 332 and extends in a direction perpendicular to the plane where the second planar portion 332 is located.

[0062] Specifically, the second plane portion 332 is injection molded on the outside of the first end of the lead-out piece 2 protruding from the first through hole 11 , and the injection molding range is the surface of the first end of the cover body 1 .

[0063] Specifically, the second annular portion 333 is injection-molded on the outside of the cover body 1 at the outer periphery of the second planar portion 332 by injection molding.

[0064] In one embodiment, the thickness of the second annular portion 333 is equal to the length of the first end of the lead-out plate 2 protruding from the first through hole 11 ; the first end of the second annular portion 333 and the first end of the lead-out plate 2 are located on the same surface.

[0065] In one embodiment, the thickness of the second annular portion 333 is less than the length of the first end of the lead-out plate 2 protruding from the first through hole 11; the first end of the second annular portion 333 is lower than the first end of the lead-out plate 2, and the first end of the lead-out plate 2 protrudes from the first end of the third insulating member 33.

[0066] In one embodiment, the third insulating member 33 also includes a protrusion 334, and a third through hole 337 is provided on the second planar portion 332 at a position corresponding to the first through hole 11. The protrusion 334 is connected to the circumference of the third through hole 337 and extends in a direction perpendicular to the plane where the second planar portion 332 is located and is connected to the outer wall of the lead-out plate 2.

[0067] Specifically, the protrusion 334 is injection molded on the outer wall of the lead-out sheet 2 along the direction from the third through hole 337 to the lead-out sheet 2, and the protrusion 334 is integrally injection molded with the second plane portion 332. The thickness of the protrusion 334 decreases along the direction from the second plane portion 332 to the first end of the lead-out sheet 2, and the cross-section of the protrusion 334 is trapezoidal along the length direction of the battery, so that the lead-out sheet 2 is connected to the second plane portion 332 and the protrusion 334 as a whole, so that the lead-out sheet 2 and the cover body 1 are connected as a whole.

[0068] In one embodiment, the third insulating member 33 includes a sealing portion 335 , which is connected to the outer periphery of the second planar portion 332 and extends in a direction perpendicular to the plane where the second planar portion 332 is located and is connected to the cover body 1 .

[0069] like Figure 3 As shown, in one embodiment, a sealing groove 12 is provided on the side of the cover body 1 , and the sealing portion 335 is embedded in the sealing groove 12 .

[0070] Specifically, the sealing portion 335 is injected into the sealing groove 12 of the cover body 1 around the second plane portion 332 by injection molding, and the sealing portion 335 and the second plane portion 332 are integrally injection molded, so that the lead-out piece 2 and the cover body 1 are connected as a whole.

[0071] like Figure 3 As shown, in one embodiment, the third insulating member 33 includes an extension portion 336, which is connected to the outer periphery of the second annular portion 333 and extends in a direction parallel to the plane where the second planar portion 332 is located. In a direction perpendicular to the cover body 1, a portion of the extension portion 336 is projected onto the surface of the cover body 1.

[0072] Specifically, the edge of the extension portion 336 protrudes from the edge of the cover body 1. When the cover body 1 is welded to the battery shell, the extension portion 336 seals the weld, thereby connecting the battery shell and the cover body 1 into a whole.

[0073] In some embodiments, the insulating member 3 is selected from PPS material, PBT material, PPA material, etc.

[0074] In some preferred embodiments, the insulating member 3 is made of PPS material. PPS material has good heat resistance, excellent electrical properties, excellent mechanical properties, and good flame retardant properties; and the insulating member 3 made of PPS material has good dimensional stability.

[0075] like Figure 1-5 As shown, in one embodiment, a single lead-out piece 2, a single insulating member 3, and a single first through hole 11 are provided on a single battery cover.

[0076] Specifically, a single battery is provided with two battery covers, which are respectively arranged at both ends of the battery shell, and the battery covers at both ends are respectively provided with lead-out pieces 2, which serve as the positive electrode and the negative electrode respectively. At this time, the single first through hole 11 is located in the middle of the cover body 1; thus, the cover body 1, the lead-out piece 2, and the insulating member 3 are assembled in sequence to form a battery cover.

[0077] like Figure 6-7 As shown, in one embodiment, two or more lead-out plates 2, two or more insulating members 3, and two or more first through holes 11 are provided on a single battery cover plate, and the two or more lead-out plates 2, two or more insulating members 3, and two or more first through holes 11 are provided in a one-to-one correspondence.

[0078] Specifically, the battery shell is a semi-enclosed battery shell with an opening at one end, and the battery cover closes the opening at one end of the battery shell. Lead-out pieces 2 are respectively provided on the left and right sides of the battery cover, serving as the positive electrode and the negative electrode respectively. At this time, the first through hole 11 is located on the left and right sides of the cover body 1, so that the lead-out piece 2 and the insulating member 3 are assembled in sequence to form the battery cover.

[0079] Another aspect of the present invention provides a battery, comprising the above-mentioned battery cover.

[0080] As shown in the figure, in one embodiment, the battery housing is a semi-enclosed battery housing with one end open, and the battery cover assembly closes the one end opening of the battery housing.

[0081] As shown in the figure, in another embodiment, the battery housing is a cylindrical battery housing with openings at both ends, and the number of battery covers is 2, and the two battery covers respectively close the openings at both ends of the battery housing.

[0082] In some embodiments, the battery housing is a square housing, a cylindrical housing, a prismatic housing or other irregular housings.

[0083] Compared with the prior art, the battery cover provided by the present invention has the following main effects:

[0084] (1) The battery cover of the present invention only has three parts, namely, the cover body, the lead-out sheet and the insulating member, and does not have the traditional liquid injection hole and explosion-proof valve. The structure is simple, and the thickness of each part can be effectively controlled. Therefore, the overall thickness of the battery cover of the present invention can be extremely thin, and the thinnest part can reach 4 mm. Therefore, the battery cover of the present invention can be suitable for ultra-thin batteries;

[0085] (2) The present invention provides an insulating member in the first through hole of the cover body, thereby isolating the lead-out plate from the cover body, avoiding contact between the lead-out plate and the cover body, and achieving a technical effect of insulating the lead-out plate and the cover body;

[0086] (3) The insulating member of the present invention is filled between the lead-out plate and the cover plate body by injection molding, so that the lead-out plate and the cover plate body are connected as a whole, thereby preventing the lead-out plate from being twisted relative to the cover plate body during use, thereby reducing the related anti-twist structure;

[0087] (4) The provision of the insulating member of the present invention not only has the technical effect of isolating the lead-out plate from the cover plate body, but also connects the lead-out plate and the cover plate body into a whole, thus providing the technical effect of an anti-twist structure. Thus, the provision of the insulating member of the present invention reduces the use of insulating members and / or anti-twist structures, making the structure of the battery cover of the present invention simple, with fewer components, and at the same time, the processing method is simple, the processing cost is low, components and related processing processes are saved, and the use effect is good;

[0088] (5) The extended structures on both sides of the cover body can be sealed and fitted with the battery shell by welding, ensuring the sealing and safety of the battery, thereby improving the safe use performance of the battery cover.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery cover, Features: The battery cover is used to close the battery shell to form a battery. The battery cover includes a cover body, a lead-out piece and an insulating member. The cover body is provided with a first through hole, and the lead-out piece is embedded in the first through hole. The insulating member is arranged between the lead-out piece and the cover body to isolate the lead-out piece from contact with the cover body. The thickness direction of the battery is the thickness direction of the cover body, and the thickness range of the cover body is 4mm-16mm.

2. The battery cover according to claim 1, Features: The cross section of the cover plate body perpendicular to the lead-out direction of the lead-out piece is a trapezoidal cross section, and the angle between the lower base and the waist of the trapezoidal cross section ranges from 10° to 45°.

3. The battery cover according to claim 2, Features: The angle between the lower bottom and the waist of the trapezoidal cross section is the thinnest part of the cover plate body, and the thickness of the thinnest part of the cover plate body is 0.1mm-0.4mm.

4. The battery cover according to claim 1, Features: Taking the thickness direction of the battery as the thickness direction of the lead-out piece, the thickness range of the lead-out piece is 0.5-10 mm.

5. The battery cover according to claim 1, Features: The length direction of the lead-out piece is along the length direction of the cover body, and the ratio of the length of the lead-out piece to the length of the cover body is 0.3-0.9:1; the cross-sectional area of ​​the lead-out piece is set to S, the current passing through the lead-out piece is A, and the relationship between S and A is: S=20%A-40%A.

6. The battery cover according to claim 1, Features: Along the width direction of the cover body, the lead-out piece is provided with a circular hole connecting the two sides of the lead-out piece, the lead-out piece passes through the first through hole of the cover body, and the first end of the lead-out piece and the second end of the lead-out piece extend from the two sides of the first through hole respectively, the first end extends from the first through hole to the outside of the battery, the second end extends from the first through hole to the inside of the battery, and the circular hole is located on the inner side of the first through hole.

7. The battery cover according to claim 6, Features: The insulating member is provided with a first annular groove inside one side close to the second end of the lead-out piece.

8. The battery cover according to claim 1, Features: A single lead-out piece, a single insulating member, and a single first through hole are arranged on a single battery cover plate.

9. The battery cover according to claim 1, Features: Two or more lead-out plates, two or more insulating members, and two or more first through holes are arranged on a single battery cover plate, and the two or more lead-out plates, two or more insulating members, and two or more first through holes are arranged in one-to-one correspondence.

10. A battery, Features: A battery cover comprising the battery cover according to any one of claims 1 to 9.

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