Battery cover plate, and battery and battery module thermal management apparatus

Abstract

A battery cover plate (15), and a battery (100) and a battery module thermal management apparatus. The battery cover plate (15) comprises a cover plate body (1), a lead-out plate (2) and an insulating member (3), wherein the cover plate body (1) is provided with a first through hole (11); the lead-out plate (2) is embedded into the first through hole (11); the insulating member (3) is arranged between the lead-out plate (2) and the cover plate body (1) and used for isolating the lead-out plate (2) from coming into contact with the cover plate body (1); and the cover plate body (1) has a thickness ranging from 4 to 16 mm. The battery cover plate (15) has a simple structure, and the battery cover plate (15) can have an extremely thin overall thickness, making it suitable for an extremely thin battery (100); and the space between the lead-out plate (2) and the cover plate body (1) is filled with the insulating member (3) by means of injection-molding, so that an insulation effect is achieved, and the lead-out plate (2) and the cover plate body (1) are also integrally connected, thereby avoiding relative torsion between the lead-out plate (2) and the cover plate body (1) during use; thus, related anti-torsion structures can be removed, saving on components and related processing procedures.

Description

A battery cover, battery, and battery module thermal management device

[0001] This application claims priority to three Chinese patent applications filed with the China Patent Office on December 5, 2023, with application number 202311656290.0 and invention name “A battery cover and battery”, application number 202311664975.X and invention name “A battery”, and application number 202323319857.3 and invention name “A battery module thermal management device and power supply thermal management system”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the field of batteries, and in particular to a battery cover and a battery and battery module thermal management device. Background Art

[0003] With the continuous expansion of the new energy industry, lithium-ion batteries, as a key component of this industry, have gained wider application. Prismatic aluminum-cased lithium-ion batteries are widely used in the power and energy storage battery fields due to their simple structure, high energy density, and excellent safety performance. However, existing battery cover plates have complex structures, multiple components, and complex processing processes. This results in thick battery covers that are unable to meet the requirements of ultra-thin battery applications. Therefore, overcoming these technical issues and drawbacks has become a key issue that needs to be addressed.

[0004] Summary of the Invention

[0005] In order to solve the problems of complex structure, multiple components, complicated processing process and thick thickness of existing battery cover plates, the present invention provides a battery cover plate and a battery and battery module thermal management device.

[0006] The technical solutions adopted by the present invention to solve the above technical problems are as follows:

[0007] In the first aspect, the present invention provides a battery cover, which is used to enclose 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.

[0008] In the second aspect, the present invention provides a battery, comprising a pole core, the battery cover plate described above, and a metal shell, wherein the pole core is connected to the battery cover plate, and the metal shell comprises a accommodating portion and a storage portion, wherein the accommodating portion is provided with a first accommodating cavity and a second accommodating cavity, wherein the first accommodating cavity is used to accommodate the pole core, and the second accommodating cavity is arranged at one end of the first accommodating cavity, and the second accommodating cavity is communicated with the first accommodating cavity, and the second accommodating cavity is used to accommodate the battery cover plate; the storage portion comprises a storage cavity for storing electrolyte or gas and a sealing end for liquid injection, wherein the storage cavity is arranged on one side of the first accommodating cavity and is communicated with the first accommodating cavity; the sealing end is provided on the side of the storage cavity away from the first accommodating cavity.

[0009] In the third aspect, the present application provides a battery module thermal management device, comprising a liquid cooling plate and a plurality of batteries as described above, the liquid cooling plate comprising a plurality of cooling plates arranged side by side along a first direction, the battery comprising a battery main body and a heat conductive limiting portion, the heat conductive limiting portion being connected to the battery main body, the battery main body being arranged on one side of the cooling plate, the heat conductive limiting portion being bent away from one end of the battery main body and being arranged on the side of the cooling plate away from the battery main body, and the heat conductive limiting portion being in contact with the cooling plate toward the side of the battery main body.

[0010] The battery cover provided by the present invention has the following main effects compared with the prior art: (1) The battery cover of the present invention has only three components, namely, a cover body, a lead-out piece and an insulating member, 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 invention can be made extremely thin, and the thickness of the cover body can reach as thin as 4 mm. Therefore, the battery cover of the present invention can be suitable for extremely thin batteries; (2) The present invention provides an insulating member in the first through hole of the cover body, thereby isolating the lead-out piece from the cover body, avoiding contact between the lead-out piece and the cover body, and achieving the technical effect of insulating the lead-out piece and the cover body; (3) The insulating member of the present invention is filled between the lead-out piece and the cover body by injection molding, isolating the lead-out piece and the cover body. The plate body is connected as a whole, which prevents the lead-out piece from twisting relative to the cover body during use, thereby reducing the related anti-twist structure; (4) The setting of the insulating member of the present invention not only plays the technical effect of insulating the lead-out piece and the cover body, but also connects the lead-out piece and the cover body as a whole, playing the technical effect of the anti-twist structure. Therefore, the setting 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 parts, simple processing method, low processing cost, saving parts and related processing process flow, and good use effect; (5) The extended structure 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

[0011] Figure 1 is a schematic structural diagram of a battery cover provided in an embodiment of the present application; Figure 2 is an exploded schematic diagram of a battery cover provided in an embodiment of the present application; Figure 3 is a schematic structural diagram of an insulating member in a battery cover provided in an embodiment of the present application; Figure 4 is a top view schematic diagram of a battery cover provided in an embodiment of the present application; Figure 5 is a cross-sectional schematic diagram of AA in Figure 4; Figure 6 is a schematic structural diagram of a -battery (including an extension portion) provided in an embodiment of the present application; Figure 7 is a schematic structural diagram of a -battery (excluding an extension portion) provided in an embodiment of the present application; Figure 8 is an exploded schematic diagram of a -battery (excluding an extension portion) provided in an embodiment of the present application; Figure 9 is a schematic structural diagram of a -battery (storage portion is perpendicular to the first accommodating cavity) provided in an embodiment of the present application; Figure 10 is a schematic structural diagram of a -battery (storage cavity is not flattened) provided in an embodiment of the present application; Figure 11 is A schematic diagram of the side structure of a battery (storage cavity is flattened) provided in an embodiment of the present application; Figure 12 is a cross-sectional view of a battery provided in an embodiment of the present application; Figure 13 is an enlarged view of portion A in Figure 12; Figure 14 is a schematic diagram of the structure of a battery module thermal management device-liquid cooling plate provided in an embodiment of the present application; Figure 15 is a cross-sectional view of a battery module thermal management device-liquid cooling plate provided in an embodiment of the present application; Figure 16 is a schematic diagram of the structure of a battery module thermal management device provided in an embodiment of the present application; Figure 17 is a cross-sectional view of a battery module thermal management device-without a heat conductor provided in an embodiment of the present application; Figure 18 is a schematic diagram of the structure of a battery module thermal management device-cell provided in an embodiment of the present application; Figure 19 is a cross-sectional view of a battery module thermal management device-with a heat conductor provided in an embodiment of the present application; and Figure 20 is an enlarged view of portion A in Figure 19.

[0012] The reference numerals in the drawings of the specification are as follows: 1-cover plate body; 11-first through hole; 12-sealing groove; 2-lead-out tab; 21-circular hole; 3-insulating member; 31-first insulating member; 311-first annular groove; 312-first flat portion; 313-first annular portion; 314-second through hole; 32-second insulating member; 33-third insulating member; 331-second annular groove; 332-second flat portion; 333-second annular portion; 334-raised portion; 335-sealing portion; 336-extension portion; 337-third through hole; 100-battery cell; 4-pole core; 5-metal housing; 51-first housing body; 52-second housing body; 511-first receiving groove; 512-third receiving groove; 513-storage part; 5131-second accommodating groove; 5132-sealing end; 5133-extension part; 15-battery cover; 34-first welding surface; 35-second welding surface; 351-plane; 352-inclined surface; 353-arc surface; 6-inner insulating film; 7-outer insulating film; 8-liquid cooling plate; 801-cooling plate; 802-liquid inlet pipe; 803-liquid outlet pipe; 804-cooling channel; 9-battery body; 10-heat-conducting limit part; 101-vertical part; 102-horizontal part; 14-heat-conducting member; 1401-first heat-conducting member; 1402-second heat-conducting member. DETAILED DESCRIPTION

[0013] 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 with reference to 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 intended to limit the present invention.

[0014] In the description of the present invention, it should be understood that the terms "lateral," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0015] In the description of the present invention, it should be noted that, unless otherwise specified or limited, the term "connection" should be understood in a broad sense. For example, it can mean a fixed connection, a detachable connection, or an integral connection; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0016] As shown in Figures 1-2, in one embodiment, the present invention provides a battery cover 15 on one hand. The battery cover 15 is used to enclose the battery shell to form a battery 100. The battery cover 15 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, and 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 100 is the thickness direction of the cover body 1, and the thickness range of the cover body 1 is 4mm-16mm.

[0017] 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 arranging an insulating piece 3 in the first through hole 11 to prevent them from contacting each other. The insulating piece 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 flow, and thus improving the safe use performance of the battery cover 15.

[0018] In a preferred embodiment, the thickness of the cover body 1 is 4 mm to 12 mm; in a more preferred embodiment, the thickness of the cover body 1 is 7 mm.

[0019] Since the battery cover 15 of the present application only has three components, namely the cover body 1, the lead-out piece 2 and the insulating member 3, it does not have traditional structures such as the liquid injection hole and the 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 15 of the present application can be made extremely thin, and the thickness of the cover body 1 can reach 4 mm. Therefore, the battery cover 15 of the present application can be suitable for ultra-thin batteries 100.

[0020] As shown in FIG4 , 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°.

[0021] 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 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 ensuring the sealing and safety of the battery 100, thereby improving the safe use performance of the battery cover 15.

[0022] As shown in FIG4 , 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 0.1 mm-0.4 mm.

[0023] 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; 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 shell is high.

[0024] In a preferred embodiment, the thinnest thickness of the cover body 1 is 0.2 mm. In this case, 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.

[0025] When the cover body 1 is welded to the battery housing, the weld seal line transitions from the cover body 1 and the battery housing to the battery housing and above the battery housing. By configuring the cover body 1 to be shaped like a trapezoid, sealing of the transition area is facilitated. The inclined surfaces on both sides of the cover body 1 can be welded to the battery housing to ensure sealing and safety of the battery 100, thereby improving the safe use performance of the battery cover 15.

[0026] In one embodiment, the direction from the battery cover 15 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, thereby 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 related processing flow, and thus improving the safe use performance of the battery cover 15.

[0027] As shown in Figures 1-2, in one embodiment, the length of the lead tab 2 is along the length of the cover body 1, and the ratio of the length of the lead tab 2 to the length of the cover body 1 is 0.3-0.9:1. Assuming the cross-sectional area of ​​the lead tab 2 is S and the current passing through the lead tab 2 is A, the relationship between S and A is: S = 20% A - 40% A. The lead tab 2 in the battery cover 15 has a rectangular cross-section. The cross-sectional area S of the lead tab 2 is affected by the current of the electrode core 4 electrically connected to it. The greater the current transmitted by the electrode core 4, the larger the cross-sectional area S of the lead tab 2. Similarly, the smaller the current of the electrode core 4, the smaller the cross-sectional area of ​​the lead tab 2. Therefore, when the current flowing through the lead tab 2 is A, the cross-sectional area S of the lead tab 2 is between 20% and 40% of A, which can meet the current conduction requirements of the lead tab 2. In this embodiment, the thickness of the lead-out tab 2 (the thickness of the lead-out tab 2 is based on the thickness direction of the battery 100) is set to 1 mm in order to cater to the extremely thin design of the battery cover 15, while ensuring its structural strength. The length of the lead-out tab 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 tab 2 is increased to meet the current requirement while ensuring that the thickness of the lead-out tab 2 remains unchanged. Of course, the thickness of the lead-out tab 2 can also be designed to be 0.5 mm, 1.5 mm, 2 mm, 2.5 mm, etc. Preferably, the thickness of the lead-out tab 2 is in the range of 0.5-10 mm, with the thickness direction of the battery 100 as the thickness direction of the lead-out tab 2. When the thickness of the lead-out piece 2 is less than 0.5 mm, the lead-out piece 2 and the cover body 1 cannot be effectively insulated by injection molding, and the sealing between the lead-out piece 2 and the cover body 1 cannot be guaranteed; when the thickness of the lead-out piece 2 is greater than 10 mm, the thickness of the lead-out piece 2 is relatively thick; when the battery cover 15 still maintains a thickness of 4 mm-16 mm, the insulating part 3 cannot effectively fix and insulate the cover body 1 and the lead-out piece 2.

[0028] 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.

[0029] 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.

[0030] As shown in Figure 2, in one embodiment, a circular hole 21 is provided on the lead tab 2 along the width of the cover body 1, connecting the two sides of the lead tab 2. The lead tab 2 extends through the first through hole 11 of the cover body 1, and the first and second ends of the lead tab 2 extend from either side of the first through hole 11. The first end of the lead tab 2 extends from the first through hole 11 to the exterior of the battery 100, while the second end extends from the first through hole 11 to the interior of the battery 100. The circular hole 21 is located inside the first through hole 11. The portion of the lead tab 2 of the battery cover 15 that extends beyond the first through hole 11 extends outside the battery 100, enabling electrical connection through other electrical connectors. The portion of the second end of the lead tab 2 that extends beyond the first through hole 11 extends into the interior of the battery 100 housing, where it is electrically connected to the tab of the electrode core 4 within the battery housing by welding. The second end of the lead tab 2 is covered by the internal insulating film 6 within the battery housing, thereby preventing contact between the lead tab 2 and other metal components of the battery 100.

[0031] 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, under the action of external force, the external force will act in the circular hole 21 instead of acting on the insulating part 3, thereby protecting the insulating part 3.

[0032] As shown in Figures 3 and 5, in one embodiment, the insulating member 3 is provided with a first annular groove 311 on one side thereof near the second end of the lead-out tab 2. The first annular groove 311 is provided on the side of the battery cover 15 located inside the shell of the battery 100. When the battery shell is sealed and connected to the cover body 1 of the battery cover 15, the first annular groove 311 is located on the inner side of the battery shell. At the same time, the second end of the lead-out tab 2 on the side of the first annular groove 311 is also located on the inner side of the battery shell. This arrangement allows the inner insulating layer provided inside the battery shell to extend into the first annular groove 311 of the insulating member 3. The inner insulating layer of the battery 100 extends into the insulating member 3 to completely cover the second end of the lead-out tab 2 located on the inner side of the battery shell, thereby meeting the insulation requirements for the second end of the lead-out tab 2.

[0033] In one embodiment, the insulating member 3 includes a first insulating member 31 . The first insulating member 31 is disposed on one side of the battery 100 . The first insulating member 31 is a first annular groove 311 .

[0034] 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 314 is provided on the first planar portion 312 at a position corresponding to the first through hole 11. 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.

[0035] 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.

[0036] Specifically, the sealing welding method includes but is not limited to laser welding, electromagnetic pulse welding, resistance welding, electron beam welding and other welding methods.

[0037] When the lead-out tab 2 is welded to the tab of the battery cell, the inner insulating film 6 on the outside of the battery cell covers the outside of the lead-out tab 2 and is disposed in the first annular groove 311 .

[0038] 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.

[0039] In one embodiment, a second insulating member 32 is disposed within 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 contact with the inner wall of the first through hole 11; a 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.

[0040] 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 body 1 are connected as a whole.

[0041] Furthermore, the second insulating member 32 is injection molded into 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 relevant anti-twisting 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 15.

[0042] In one embodiment, the third insulating member 33 is injection molded on the exterior 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 .

[0043] 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.

[0044] Specifically, the second planar portion 332 is injection molded on the exterior 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 .

[0045] Specifically, the second annular portion 333 is injection-molded onto the exterior of the cover body 1 at the outer periphery of the second planar portion 332 by injection molding.

[0046] 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.

[0047] In one embodiment, the thickness of the second annular portion 333 is less than the length of the first end of the lead-out piece 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 piece 2, and the first end of the lead-out piece 2 protrudes from the first end of the third insulating member 33.

[0048] 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 of the second planar portion 332 and is connected to the outer wall of the lead-out plate 2.

[0049] Specifically, the raised portion 334 is injection-molded onto the outer wall of the lead-out tab 2 along the direction from the third through-hole 337 to the lead-out tab 2, and the raised portion 334 is integrally injection-molded with the second planar portion 332. The thickness of the raised portion 334 decreases along the direction from the second planar portion 332 to the first end of the lead-out tab 2. Along the length of the battery 100, the raised portion 334 has a trapezoidal cross-section, thereby integrally connecting the lead-out tab 2, the second planar portion 332, and the raised portion 334, thereby connecting the lead-out tab 2 to the cover body 1 as a single unit.

[0050] In one embodiment, the third insulating member 33 includes a sealing portion 335 . The sealing portion 335 is connected to the outer periphery of the second planar portion 332 , extends in a direction perpendicular to the plane where the second planar portion 332 is located, and is connected to the cover body 1 .

[0051] As shown in FIG. 3 , in one embodiment, a sealing groove 12 is provided on the side surface of the cover body 1 , and the sealing portion 335 is embedded in the sealing groove 12 .

[0052] Specifically, the sealing portion 335 is injected into the sealing groove 12 of the cover body 1 around the outer periphery of the second plane portion 332 by injection molding. The sealing portion 335 and the second plane portion 332 are integrally injection molded, thereby connecting the lead-out piece 2 and the cover body 1 as a whole.

[0053] As shown in Figure 3, 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 the direction perpendicular to the cover body 1, part of the extension portion 336 is projected onto the surface of the cover body 1.

[0054] 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.

[0055] In some embodiments, the insulating member 3 is selected from PPS material, PBT material, PPA material, etc.

[0056] In some preferred embodiments, the insulating member 3 is made of PPS material, which has good heat resistance, excellent electrical properties, excellent mechanical properties, and good flame retardancy. Furthermore, the insulating member 3 made of PPS material has good dimensional stability.

[0057] As shown in FIG. 1-5 , in one embodiment, a single battery cover plate 15 is provided with a single lead-out piece 2 , a single insulating member 3 , and a single first through hole 11 .

[0058] Specifically, a single battery 100 is provided with two battery cover plates 15, and the two battery cover plates 15 are respectively arranged at both ends of the battery shell. The battery cover plates 15 at both ends are respectively provided with lead-out plates 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 plate body 1; thus, the cover plate body 1, the lead-out plate 2, and the insulating member 3 are assembled in sequence to form the battery cover plate 15.

[0059] Another aspect of the present invention provides a battery 100 including the battery cover 15 described above.

[0060] As shown in FIG6 , in one embodiment, the battery housing is a semi-enclosed battery housing with one end open, and the battery cover 15 closes the one end opening of the battery housing.

[0061] As shown in FIG6 , in another embodiment, the battery housing is a cylindrical battery housing with openings at both ends, and there are two battery cover plates 15 , which respectively close the openings at both ends of the battery housing.

[0062] In some embodiments, the battery housing is a square housing, a cylindrical housing, a prismatic housing, or other irregular housings.

[0063] The battery cover 15 provided by the present invention has the following main effects compared with the prior art: (1) The battery cover 15 of the present invention has only three components, namely the cover body 1, the lead-out piece 2 and the insulating member 3, and does not have traditional structures such as the injection hole and the 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 15 of the present invention can be made extremely thin, and the thinnest part can reach 4 mm. Therefore, the battery cover 15 of the present invention can be suitable for ultra-thin batteries 100; (2) The present invention provides an insulating member 3 in the first through hole 11 of the cover body 1, thereby isolating the lead-out piece 2 from the cover body 1, avoiding contact between the lead-out piece 2 and the cover body 1, and achieving the technical effect of insulating the lead-out piece 2 and the cover body 1; (3) The insulating member 3 of the present invention is filled between the lead-out piece 2 and the cover body 1 by injection molding, thereby isolating the lead-out piece 2 It is connected to the cover body 1 as a whole, avoiding the relative twisting of the lead-out piece 2 and the cover body 1 during use, reducing the related anti-twist structure; (4) The setting of the insulating member 3 of the present invention not only plays the technical effect of the insulating member 3 that isolates the lead-out piece 2 and the cover body 1, but also connects the lead-out piece 2 and the cover body 1 as a whole, playing the technical effect of the anti-twist structure. Therefore, the setting of the insulating member 3 of the present invention reduces the use of the insulating member 3 and / or the anti-twist structure, making the structure of the battery cover 15 of the present invention simple, with fewer components, simple processing method, low processing cost, saving components and related processing process flow, and good use effect; (5) The extended structure on both sides of the cover body 1 can be sealed and fitted with the battery shell by welding, ensuring the sealing and safety of the battery 100, thereby improving the safe use performance of the battery cover 15.

[0064] As shown in Figures 6 to 13, an embodiment of the present application provides a battery 100, including a pole core 4, the battery cover 15 described above, and a metal shell 5, wherein the pole core 4 is connected to the battery cover 15, and the metal shell 5 includes a accommodating portion and a storage portion 513, wherein the accommodating portion is provided with a first accommodating cavity and a second accommodating cavity, wherein the first accommodating cavity is used to accommodate the pole core 4, and the second accommodating cavity is provided at one end of the first accommodating cavity, and the second accommodating cavity is communicated with the first accommodating cavity, and the second accommodating cavity is used to accommodate the battery cover 15, and the storage portion 513 includes a storage cavity for storing electrolyte or gas and a sealing end 5132 for liquid injection, wherein the storage cavity is provided on one side of the first accommodating cavity and is communicated with the first accommodating cavity; the sealing end 5132 is provided on the side of the storage cavity away from the first accommodating cavity.

[0065] Specifically, as shown in Figures 6-8, the battery 100 provided in the present application includes two battery cover plates 15, one of which is a positive battery cover plate 15 and the other is a negative battery cover plate 15. The positive battery cover plate 15 is welded to the positive tab of the electrode core 4, and the negative battery cover plate 15 is welded to the negative tab of the electrode core 4. It should be noted that the first direction and the second direction of the present application are shown in Figure 6, for example, the first direction is the x-direction and the second direction is the y-direction, and the first direction is perpendicular to the second direction.

[0066] As shown in Figures 6-7, the pole core 4 is connected to the battery cover 15. Preferably, the pole core 4 and the battery cover 15 are connected by welding, which can be laser welding. In the first direction, a second accommodating cavity is provided at each end of the first accommodating cavity, and each second accommodating cavity accommodates a battery cover 15. The first accommodating cavity in the metal shell 5 is used to accommodate the pole core 4. The second accommodating cavity is connected to the first accommodating cavity, so that the second accommodating cavity can be used to accommodate the battery cover 15.

[0067] The storage portion 513 includes a storage cavity and a sealing end 5132. The storage cavity is provided at one end of the first accommodating cavity in the second direction, and the sealing end 5132 is provided on the side of the storage cavity away from the first accommodating cavity. The storage cavity is used to store electrolyte or gas. As shown in Figures 6-7, the storage cavity is mainly used to store electrolyte or gas. The gas here refers to the gas generated during the charging and discharging process of the battery 100. The electrolyte is stored because the battery 100 provided in this application is injected once, and the pole core 4 cannot completely absorb the electrolyte. Excess electrolyte may be stored in the storage cavity. As the static time of the battery 100 increases, the electrolyte in the storage cavity can flow into the first accommodating cavity, so that the electrolyte can be absorbed by the pole core 4. Before the battery 100 is injected with liquid, the sealing end 5132 is an open end before the battery 100 is sealed, and except for the shell at the open end which is not sealed, the other two sides of the battery 100 have been seal-welded. When the battery 100 is injected with liquid, the open end is directly opened, the injection end in the injection device is aligned with the open end, and the electrolyte is injected into the battery 100 through the open end. Injecting the electrolyte through the open end can enable the electrolyte to quickly infiltrate the pole core 4, thereby improving the infiltration efficiency of the electrolyte. After the injection is completed, the open end is seal-welded to form the sealing end 5132. The sealing method can be selected from laser welding or resistance welding.

[0068] Compared with the prior art, the battery 100 provided in the present application has the following main effects: 1) Compared with the injection through the injection hole, the battery 100 provided in the present application has a sealed end 5132 for injection, and the injection hole is large, which speeds up the injection speed, shortens the injection process time, and improves production efficiency. 2) Compared with the existing battery 100, the battery 100 provided in the present application is provided with a storage chamber, which directly performs a single injection, and the excess electrolyte is directly stored in the storage chamber, without the need for multiple injections, thus simplifying the injection steps; at the same time, in the subsequent infiltration process, the electrolyte in the storage chamber can gradually flow into the first accommodating chamber so that the electrolyte in the storage chamber can be completely infiltrated into the pole core 4. 3) The storage chamber can collect the gas generated by the battery 100 during the formation process, and there is no need for a continuous vacuum exhaust process during the formation process, thus saving costs. 4) Compared with the soft-pack battery 100, the battery 100 provided in the present application has a storage cavity for storing electrolyte and gas generated by the formation of the battery 100, so as to avoid the problem of battery cell bloating or poor appearance caused by insufficient storage part 513; after the formation is completed, the storage cavity is directly flattened to discharge the gas from the battery 100, without the need for vacuum exhaust, thereby reducing the extraction of electrolyte. In some embodiments, the metal shell 5 includes a folded edge and two shell bodies, one of the two shell bodies is provided with a first receiving groove 511, a second receiving groove 5131 and a third receiving groove 512, and the third receiving groove 512 is provided at the end of the first receiving groove 511 in the first direction, and the first receiving groove 511 is connected to the third receiving groove 512; in the second direction, the first receiving groove 511 and the second receiving groove 5131 are spaced apart, and the first direction is perpendicular to the second direction;

[0069] The two shell bodies are folded along the folded edge, the first accommodating groove 511 of one shell body and the other shell body form the first accommodating cavity, the third accommodating groove 512 of one shell body and the other shell body form the second accommodating cavity, and the second accommodating groove 5131 of one shell body and the other shell body form the storage cavity.

[0070] Specifically, the two shell bodies are defined as a first shell body 51 and a second shell body 52. ​​A first receiving groove 511, a second receiving groove 5131, and a third receiving groove 512 are provided on the first shell body 51, wherein the first receiving groove 511, the second receiving groove 5131, and the third receiving groove 512 are preferably formed by stamping. The first receiving groove 511 is formed directly on the first shell body 51, and no pits are punched on the second shell body 52. ​​Compared with the existing method of punching pits on both sides of the aluminum-plastic film in the soft-pack battery 100, the battery 100 provided by this application reduces the number of steps and shortens the process time. As shown in Figures 6-7, the third receiving groove 512, the first receiving groove 511, and the second receiving groove 5131 are all stamped on the same shell body. The material of the metal shell 5 is preferably aluminum shell material, with uniform wall thickness and consistent overall structural strength. At the same time, it can also ensure that the structural strength of the four corners is consistent. Compared with the existing soft-pack aluminum-plastic film composite film material, the battery 100 provided by this application has a better heat dissipation effect when the shell is made of metal material.

[0071] In some embodiments, the material of the metal shell 5 includes aluminum, aluminum alloy, etc.

[0072] In some embodiments, the thickness of the metal shell 5 is 0.2 mm.

[0073] The second receiving groove 5131 and the second housing body 52 form a storage cavity for storing electrolyte and gas generated by the battery 100. The third receiving groove 512 and the second housing body 52 form a second receiving cavity for receiving the battery cover 15.

[0074] In some embodiments, the volume of the first accommodating cavity is V1, the volume of the storage cavity is V2,

[0075] The range of V1:V2 is 1:(0.05~0.5). The storage cavity in the battery 100 is used as a liquid storage bag during the liquid injection process of the battery 100 processing. It can be used to store the electrolyte required for the infiltration of the pole core 4 in the first accommodating cavity. During the infiltration process of the pole core 4, the electrolyte stored in the storage cavity will gradually penetrate into the first accommodating cavity. In addition, the storage cavity is used as an exhaust bag during the formation process of the battery 100 processing. It can be used to store the gas generated by the formation of the battery 100. After the formation process is completed, the storage cavity can be separated from the first accommodating cavity by cutting, or the storage cavity can be flattened by exhausting gas, so that the battery 100 forms heat dissipation fins at the storage cavity. Therefore, under the premise of meeting the processing requirements of the pole core 4 in the first accommodating cavity, the volume of the storage cavity should be as small as possible.

[0076] Specifically, as shown in Figures 6-8, the height of the storage cavity is less than the height of the first accommodating cavity, limiting the volume V2 of the storage cavity to be less than the volume V1 of the first accommodating cavity, and limiting the range of V1:V2 to 1:(0.05-0.5). This can reduce the volume occupied by the storage cavity without increasing the overall thickness of the battery 100, while also providing a storage cavity with sufficient volume to store the gas generated by the formation of the battery 100, thereby avoiding or reducing the occurrence of bloating of the battery 100. At the same time, due to different processing techniques of the battery 100, the exhaust volume of the pole core 4 will also vary greatly. Therefore, under the premise of the same volume V1 of the first accommodating cavity, the volume V2 of the storage cavity can be adjusted according to different processing techniques so that the volume V2 of the storage cavity can meet the processing requirements of the battery 100.

[0077] More preferably, the range of V1:V2 is 1:(0.1-0.4). Still more preferably, the range of V1:V2 is 1:(0.1-0.3). Still more preferably, the range of V1:V2 is 1:(0.1-0.2).

[0078] In some preferred embodiments, the ratio of V1 to V2 is 1:0.166. The volume V1 of the first accommodating chamber is related to the volume V2 of the storage chamber; the larger the volume V1 of the first accommodating chamber, the larger the volume V2 of the storage chamber. Generally speaking, a volume V1 of the first accommodating chamber that is six times the volume V2 of the storage chamber can meet the requirements of venting and filling the pole core 4 within the first accommodating chamber during processing. In other words, the ratio of the volume V1 of the first accommodating chamber to the volume V2 of the storage chamber is 1:0.166.

[0079] In some embodiments, along the direction away from the first receiving groove 511 , the distance between the side surface of the second receiving groove 5131 close to the first receiving groove 511 and the other shell body gradually increases.

[0080] Specifically, as shown in Figure 6, the side surface of the second receiving groove 5131 on the side closest to the first receiving groove 511 is inclined in a direction away from the first receiving groove 511, that is, along the y-axis. The inclination direction is from the bottom of the second receiving groove 5131 toward the second housing body 52, and the distance between the side surface of the first receiving groove 511 and the second housing body 52 gradually increases. The inclined arrangement of the second receiving groove 5131 on the side closest to the first receiving groove 511 facilitates the flow of electrolyte into the first receiving cavity along the inclined side surface. Furthermore, when the battery 100 is vented after formation, gas in the storage cavity can be discharged along the inclined side surface, eliminating the need for vacuum venting and reducing the amount of electrolyte drawn out.

[0081] In some embodiments, in the first direction, the length of the first receiving groove 511 is L1, the length of the second receiving groove 5131 is L2, L2≤L1, and the range of L2:L1 is (0.1~1.0):1.

[0082] Specifically, in the first direction, the length L1 of the first accommodating groove 511 is greater than or equal to the length L2 of the second accommodating groove 5131, and the range of L2:L1 is (0.1~1.0):1, that is, the length of the second accommodating groove 5131 is less than the length of the pole core 4, which does not increase the overall length of the battery 100 and reduces the occupied volume of the storage cavity.

[0083] Specifically, the ratio of L2:L1 can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or 1.0, as long as the ratio of L2:L1 is within the range of (0.1-1.0):1. In this embodiment, as shown in FIG6 , the length L2 of the second receiving groove 5131 is equal to the length L1 of the first receiving groove 511, that is, L1=L2.

[0084] In some embodiments, the battery cover 15 includes a first welding surface 34 and a second welding surface 35 , wherein the first welding surface 34 is a plane 351 structure, and the first welding surface 34 is welded to the other shell body;

[0085] The second welding surface 35 includes two arc surfaces 353, a plane 351 and two inclined surfaces 352. The two inclined surfaces 352 are connected to the two ends of the plane 351 through the arc surfaces 353 respectively.

[0086] The second welding surface 35 is welded to the third receiving groove 512 of a shell body.

[0087] Specifically, the first welding surface 34 is set as a plane 351 structure to facilitate welding the first welding surface 34 to the second shell body 52, reduce welding difficulty, and improve welding efficiency; the welding method here includes laser welding or resistance welding, and laser welding is preferred.

[0088] The second welding surface 35 is composed of an arcuate surface 353, a flat surface 351, and an inclined surface 352. This is because the battery cover 15 has a certain thickness. Therefore, a third receiving groove 512 is provided on the first housing body 51 to accommodate the battery cover 15 of a certain thickness. The shape of the third receiving groove 512 is the same as that of the second welding surface 35 of the battery cover 15, thereby facilitating the accommodation of the battery cover 15. As shown in Figure 1, the second welding surface 35 includes a flat surface 351 with an arcuate surface 353 at each end of the flat surface 351. The arcuate surfaces 353 serve as transitions. Each arcuate surface 353 is connected to an inclined surface 352 at the end away from the flat surface 351. The inclined surfaces 352 facilitate the sealing welding of the second housing body 52 and the first housing body 51. Without the inclined surface 352, the welds between the battery cover 15 and the first and second housing bodies 51, 52 would have gaps, affecting the sealing of the battery 100.

[0089] In some embodiments, the battery cover 15 includes a lead-out piece 2, an insulating member 3 and a cover body 1, wherein a first through hole 11 is provided in the cover body 1, the insulating member 3 is inserted into the first through hole 11 and extends out of the cover body 1, a second through hole 314 is provided in the insulating member 3, the lead-out piece 2 is provided in the second through hole 314 and extends out of the insulating member 3, and the length of the lead-out piece 2 extending out of the insulating member 3 is greater than the length of the insulating member 3 extending out of the cover body 1.

[0090] The insulating member 3 extends out of the cover body 1 to provide insulation and prevent short circuits in the battery 100. The lead tab 2 extends out of the insulating member 3, with one end of the extension welded to the tab or connection tab of the pole core 4 and the other end of the extension being used for electrical connection to an external circuit.

[0091] Furthermore, the length of the lead-out tab 2 extending out of the insulating member 3 is greater than the length of the insulating member 3 extending out of the cover body 1 by 6-7 mm; this facilitates welding one end of the lead-out tab 2 to the tab or connecting tab of the pole core 4, and the other end of the lead-out tab 2 is used to electrically connect to the external circuit. In this embodiment, the battery cover 15 has no injection hole, and the pole is the lead-out tab 2, which can be as thin as 0.5 mm. Therefore, the thickness of the battery cover 15 can be made extremely thin, and the overall thickness of the corresponding battery 100 can also be made extremely thin (the thinnest can be 6 mm thick). Existing batteries 100 are limited by the structure of the battery cover 15, and generally 18 mm is already very thin (because the battery cover 15 of the existing square battery 100 includes the pole, injection hole, explosion-proof valve, etc., and the width of the battery cover 15 is relatively wide). Therefore, compared with the prior art, the battery 100 provided in this application is thinner, reducing the space occupied by the battery 100.

[0092] In some embodiments, in the second direction, the extension direction of the storage cavity is parallel to the extension direction of the first accommodating cavity; or in the second direction, the extension direction of the storage cavity is perpendicular to the extension direction of the first accommodating cavity.

[0093] One arrangement of the storage cavity and the first accommodating cavity is shown in Figures 6-8. In the second direction, the storage cavity and the first accommodating cavity are arranged side by side, and the extension direction of the storage cavity is parallel to the extension direction of the first accommodating cavity.

[0094] Another arrangement of the storage cavity and the first accommodating cavity is shown in FIG9 , where the extension direction of the storage cavity is perpendicular to the extension direction of the first accommodating cavity.

[0095] It is understood that the extension direction of the storage cavity and the extension direction of the first accommodating cavity form an angle, and the angle can be in the range of 0-180°. An angle of 0 or 180° indicates a parallel arrangement, an angle of 90° indicates a perpendicular arrangement, and other angles are also possible. When the angle is acute, the inclined surface is more conducive to the diversion of the electrolyte in the storage cavity.

[0096] In some embodiments, an inner insulating film 6 is provided on the inner surface of the metal shell 5 facing the pole core 4 , and the inner insulating film 6 is provided between the metal shell 5 and the pole core 4 , and the inner insulating film 6 covers the pole core 4 ;

[0097] An outer insulating film 7 is provided on the outer surface of the metal shell 5 facing away from the pole core 4 , and the outer insulating film 7 covers the outer circumference of the metal shell 5 .

[0098] The inner insulating film 6 covers the pole core 4, and the outer insulating film 7 covers the outer periphery of the metal shell 5, both of which prevent the battery 100 from short circuiting.

[0099] It is understood that the structure of the inner insulating film 6 is the same as that of the metal shell 5. Alternatively, the structure of the inner insulating film 6 and the structure of the metal shell 5 may be different, as long as the inner insulating film 6 covers the periphery of the pole core 4 and prevents short circuits in the battery 100. As shown in FIG8 , the structure of the outer insulating film 7 is preferably the same as that of the metal shell 5, so that the outer insulating film 7 can completely cover the periphery of the metal shell 5 and prevent short circuits in the battery 100.

[0100] In some embodiments, as shown in FIG6-7 , the side surface of the first accommodating groove 511 close to the second accommodating groove 5131 is an arc surface, and the side surface of the second accommodating groove 5131 close to the first accommodating groove 511 is also an arc surface.

[0101] The first accommodating groove 511 and the second accommodating groove 5131 are both formed by punching. The side of the first accommodating groove 511 close to the second accommodating groove 5131 is punched into an arc surface, and the side of the second accommodating groove 5131 close to the first accommodating groove 511 is also an arc surface, which can reduce material stress and effectively improve the punching efficiency of the first accommodating groove 511 and the second accommodating groove 5131.

[0102] In some embodiments, the distance between the first receiving groove 511 and the second receiving groove 5131 is X, the depth of the first receiving groove 511 is H, and H and X satisfy the following relationship: 0.5H≤X≤3H.

[0103] If X is too low, the distance between the first receiving groove 511 and the second receiving groove 5131 is too close, making it easy to break through the first receiving groove 511 and / or the second receiving groove 5131 during punching, increasing production costs. If X is too large, the volume of the metal housing 5 increases, increasing the cost of the battery 100 and reducing the volumetric energy density. The distance X between the first receiving groove 511 and the second receiving groove 5131 and the depth H of the first receiving groove 511 satisfy the following relationship: 0.5H ≤ X ≤ 3H. This effectively improves the efficiency of punching to form the first receiving groove 511 and the second receiving groove 5131.

[0104] It should be noted that the first accommodating groove 511 is close to the first side of the second accommodating groove 5131, and the second accommodating groove 5131 is close to the second side of the first accommodating groove 511, and the first side and the second side are both arc surfaces. The distance X between the first accommodating groove 511 and the second accommodating groove 5131 defined in this embodiment is the distance between the side of the first side facing the opening of the first accommodating groove 511 and the side of the second side facing the opening of the second accommodating groove 5131.

[0105] In some preferred embodiments, H and X satisfy the following relationship: 1.0H≤X≤2.5H.

[0106] More preferably, H and X satisfy the following relationship: 1.0H≤X≤2.0H; even more preferably, X=1.5H.

[0107] In some embodiments, an extension portion 5133 is further provided at one end of the sealing end 5132 away from the storage cavity, and the cross-section of the extension portion 5133 is polygonal.

[0108] As shown in FIG6 , the extension portion 5133 can also be used to store gas. After the battery 100 is formed, gas is stored in the extension portion 5133. The extension portion 5133 can be cut open to release the gas in the storage cavity and the extension portion 5133. The cut portion can then be welded to seal the battery 100. Laser welding or resistance welding can be used, with resistance welding being preferred. Alternatively, as shown in FIG8 , the extension portion 5133 can be cut off, leaving the sealed end 5132 with a straight cross-section. The trimmed portion of the metal housing 5 can then be welded directly using resistance welding or laser welding.

[0109] It should be noted that the cross section of the extension portion 5133 is a polygon, the number of sides of the polygon is n, n≥3, such as a square, rectangle, pentagon, etc., and the preferred cross section is a square or rectangle.

[0110] In some embodiments, the cross-section of the sealing end 5132 is linear or L-shaped.

[0111] As shown in FIG8 , when the extension portion 5133 is completely cut off, the cross-section of the sealing end 5132 is linear. If the extension portion 5133 is not cut off, the cross-section of the sealing end 5132 is L-shaped. Whether to cut off the extension portion 5133 can be selected according to actual needs and is not limited in this application.

[0112] It should be noted that the gas generated after the battery 100 is formed can be discharged from the battery 100 by flattening the storage cavity. Because there is still electrolyte in the storage cavity, if the storage cavity is directly cut out and the metal shell 5 is sealed and welded, the presence of electrolyte will affect the welding of the shell. Therefore, the battery 100 provided in this application retains the storage cavity. The battery 100 that retains the storage cavity can improve the welding efficiency of the two bending surfaces and improve production efficiency. It can be seen from Figures 10 and 11 that Figure 10 is a structural diagram without flattening the storage cavity, and Figure 11 is a structural diagram with the storage cavity directly flattened after the gas is exhausted. It can be understood that whether the storage cavity is flattened or not can be selected according to the actual situation, and this application does not limit it.

[0113] As shown in Figures 14 to 20, on the one hand, an embodiment of the present application provides a battery 100 module thermal management device, including a liquid cooling plate 8 and multiple batteries 100, the liquid cooling plate 8 includes multiple cooling plates 801 arranged side by side along a first direction, the battery 100 includes a battery main body 9 and a heat-conductive limiting portion 10, the heat-conductive limiting portion 10 is connected to the battery main body 9, the battery main body 9 is arranged on one side of the cooling plate 801, the heat-conductive limiting portion 10 is bent away from one end of the battery main body 9 and is arranged on the side of the cooling plate 801 away from the battery main body 9, and the heat-conductive limiting portion 10 is in contact with the cooling plate 801 toward the side of the battery main body 9.

[0114] The battery 100 module thermal management device provided in the present application comprises a battery 100 including a battery main body 9 and a heat-conducting limiting portion 10. The heat-conducting limiting portion 10 is connected to the battery main body 9. A portion of the heat generated inside the battery 100 can be conducted to the heat-conducting limiting portion 10. The heat-conducting limiting portion 10 abuts against the side of the cooling plate 801 facing away from the battery main body 9. The heat in the heat-conducting limiting portion 10 can be dissipated through the cooling plate 801. Another portion of the heat generated by the battery main body 9 can be dissipated through the cooling plate 801 in contact with the battery main body 9, thereby effectively utilizing the heat dissipation of the cooling plate 801 to improve the heat dissipation efficiency of the battery 100.

[0115] In some embodiments, the heat-conductive limiting portion 10 includes a vertical portion 101 and a horizontal portion 102, one end of the vertical portion 101 is connected to the battery main body 9, and the end of the vertical portion 101 away from the battery main body 9 is connected to the horizontal portion 102, the vertical portion 101 is arranged between two adjacent cooling plates 801, and the horizontal portion 102 is arranged on the side of the cooling plate 801 away from the battery main body 9, and the horizontal portion 102 is in contact with the cooling plate 801.

[0116] Specifically, the vertical portion 101 is disposed between two adjacent cooling plates 801 and serves as a position limiter, restricting the movement of the cooling plates 801, thereby ensuring better contact between the cooling plates 801 and the battery 100 and providing better cooling for the battery 100. The horizontal portion 102 is disposed on the side of the cooling plate 801 facing away from the battery body 9, and abuts against the cooling plate 801. The contact between the horizontal portion 102 and the cooling plate 801 allows for better heat conduction, thereby transferring heat from the horizontal portion 102 to the cooling plate 801 and improving the heat dissipation efficiency of the battery 100.

[0117] In some embodiments, two horizontal portions 102 are provided on a side of the cooling plate 801 facing away from the battery main body 9 , and the projections of the two horizontal portions 102 on the cooling plate 801 overlap with each other.

[0118] As shown in Figures 16-17, there are two battery main bodies 9 below a cooling plate 801, and each battery main body 9 is connected to a vertical portion 101 and a horizontal portion 102. One vertical portion 101 is located on one side of the cooling plate 801, and the other vertical portion 101 is located on the other side of the cooling plate 801. The two vertical portions 101 can limit the movement of the cooling plate 801; one horizontal portion 102 is located at one end of the cooling plate 801 away from the battery main body 9, and the other horizontal portion 102 is located at the other end of the cooling plate 801 away from the battery main body 9. As shown in Figures 16-17, the two horizontal portions 102 do not intersect, and the projections of the two horizontal portions 102 on the cooling plate 801 do not overlap with each other. The two horizontal portions 102 can also intersect, and the projections of the two horizontal portions 102 on the cooling plate 801 overlap with each other.

[0119] The projections of the two horizontal parts 102 on the cooling plate 801 overlap with each other because the horizontal parts 102 are in contact with the cooling plate 801. The horizontal parts 102 in the contacting part can contact with the cooling plate 801 and can conduct heat to reduce the temperature of the horizontal parts 102, so it does not affect the heat dissipation efficiency of the battery main body 9.

[0120] In some embodiments, the horizontal portion 102 is arranged parallel to the cooling plate 801 .

[0121] The horizontal portion 102 is arranged parallel to the cooling plate 801 . The contact area between the horizontal portion 102 and the cooling plate 801 is large, so heat exchange can be better performed between the horizontal portion 102 and the cooling plate 801 , thereby improving the heat dissipation efficiency of the battery 100 .

[0122] In some embodiments, the battery 100 module thermal management device also includes a heat conductor 14, and the heat conductor 14 includes a plurality of first heat conductors 1401, wherein the first heat conductors 1401 are arranged between the battery main body 9 and the cooling plate 801, and one side of the first heat conductor 1401 abuts against the battery main body 9, and the side of the second heat conductor 1402 facing away from the battery main body 9 abuts against the cooling plate 801.

[0123] The heat conducting member 14 has a heat conducting function. The heat conducting member 14 is arranged between the battery main body 9 and the cooling plate 801 , which can effectively conduct the heat at the contact position with the battery main body 9 to the cooling plate 801 , thereby improving the heat dissipation efficiency of the battery 100 .

[0124] In some embodiments, the heat conducting member 14 also includes a plurality of second heat conducting members 1402, and the second heat conducting members 1402 are filled between the heat conducting limiting portion 10 and the cooling plate 801, one side of the second heat conducting member 1402 abuts against the heat conducting limiting portion 10, and the side of the heat conducting member 14 facing away from the heat conducting limiting portion 10 abuts against the cooling plate 801.

[0125] The cooling plate 801 and the second heat conducting member 1402 of the heat conducting limiting portion 10 of the cooling plate 801 have a heat conducting function. The second heat conducting member 1402 is filled between the heat conducting limiting portion 10 and the cooling plate 801, which can effectively conduct the heat in contact with the heat conducting limiting portion 10 to the cooling plate 801, thereby improving the heat dissipation efficiency of the battery 100.

[0126] In some preferred embodiments, as shown in FIG. 19 and FIG. 20 , the second heat conducting member 1402 is disposed between the horizontal portion 102 of the heat conducting limiting portion 10 and the cooling plate 801 .

[0127] In some preferred embodiments, the second heat conducting member 1402 is filled between the vertical portion 101 of the heat conducting limiting portion 10 and the cooling plate 801 and the battery main body 9 .

[0128] The second heat-conducting member 1402 is a heat-conducting gel, a heat-conducting sheet, or a heat-conducting filling member.

[0129] In some embodiments, a plurality of the battery main bodies 9 are arranged side by side along a first direction on one side of the cooling plate 801 , and the battery main bodies 9 abut against the cooling plate 801 .

[0130] Specifically, the battery main body 9 abuts against the cooling plate 801 , and the battery main body 9 is in direct contact with the cooling plate 801 , thereby increasing heat conduction therebetween and improving the heat dissipation efficiency of the battery 100 .

[0131] As shown in Figure 16, the first direction is the x-axis direction, the second direction is the y-axis direction, and the first direction is perpendicular to the second direction. In the first direction, the liquid cooling plate 8 includes multiple cooling plates 801 arranged side by side. Correspondingly, multiple batteries 100 are also arranged side by side in the first direction, and multiple battery main bodies 9 are arranged side by side below the cooling plates 801.

[0132] In some embodiments, the battery body 9 includes a metal shell 5 and a pole core 4. The metal shell 5 is provided with a receiving cavity, and the pole core 4 is disposed in the receiving cavity. One end of the metal shell 5 is formed with the heat-conducting stopper 10, and the interior of the heat-conducting stopper 10 is in communication with the receiving cavity. Specifically, the interior of the heat-conducting stopper 10 is in communication with the receiving cavity, and the heat-conducting stopper 10 facilitates the transfer of heat generated by the pole core 4 located in the receiving cavity within the battery body 9 to the heat-conducting stopper 10.

[0133] In some embodiments, the thermally conductive limiting portion 10 is made of metal.

[0134] In some preferred embodiments, the material of the heat-conducting limiting portion 10 is the same as that of the metal shell 5 .

[0135] Metal materials include aluminum, aluminum alloy, etc.

[0136] In some embodiments, the liquid cooling plate 8 also includes a liquid inlet pipe 802 and a liquid outlet pipe 803, and a plurality of cooling channels 804 are arranged in the cooling plate 801. The liquid inlet pipe 802 is arranged on one side of the cooling plate 801, and the liquid outlet pipe 803 is arranged on the side of the cooling plate 801 away from the liquid inlet pipe 802. The cooling channels 804 of the cooling plate 801 are respectively connected to the liquid inlet pipe 802 and the liquid outlet pipe 803.

[0137] Specifically, a liquid inlet pipe 802 and a liquid outlet pipe 803 are provided on both sides of the cooling plate 801. The liquid inlet pipe 802 is used to allow cooling liquid to enter the cooling channel 804 of the cooling plate 801, and the liquid outlet pipe 803 is used to allow cooling liquid to flow out of the cooling channel 804. Each cooling plate 801 is provided with a cooling channel 804, which is used to flow cooling liquid and simultaneously serves to reduce the temperature of the battery 100 and improve the heat dissipation efficiency of the battery 100.

[0138] In a second aspect, the present application provides a power supply thermal management system, including the battery 100 module thermal management device described above.

[0139] The power thermal management system provided in this application can effectively improve the heat dissipation efficiency of the battery 100, reduce the heat of the battery 100, and be beneficial to the performance of the battery 100.

[0140] 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 scope of protection of the present invention.

Claims

1. A battery cover, characterized in that: 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, characterized in that: 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°; 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.

3. The battery cover according to claim 1, characterized in that: 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.

4. The battery cover according to claim 1, characterized in that: 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.

5. The battery cover according to claim 1, characterized in that: Along the width direction of the cover body, the lead-out piece is provided with a circular hole communicating with 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 inside the first through hole; The insulating member is provided with a first annular groove inside one side close to the second end of the lead-out piece.

6. A battery, characterized in that: It includes a pole core, a metal shell and a battery cover as described in any one of claims 1 to 5, wherein the pole core is connected to the battery cover, the metal shell includes a accommodating portion and a storage portion, the accommodating portion is provided with a first accommodating cavity and a second accommodating cavity, the first accommodating cavity is used to accommodate the pole core, the second accommodating cavity is arranged at one end of the first accommodating cavity, and the second accommodating cavity is communicated with the first accommodating cavity, and the second accommodating cavity is used to accommodate the battery cover; the storage portion includes a storage cavity for storing electrolyte or gas and a sealing end for liquid injection, the storage cavity is arranged on one side of the first accommodating cavity, and is communicated with the first accommodating cavity; the sealing end is provided on the side of the storage cavity away from the first accommodating cavity.

7. The battery according to claim 6, characterized in that The metal shell comprises a folded edge and two shell bodies, one of the two shell bodies is provided with a first receiving groove, a second receiving groove and a third receiving groove, the third receiving groove is provided at the end of the first receiving groove in the first direction, and the first receiving groove is communicated with the third receiving groove; the first receiving groove and the second receiving groove are arranged at intervals in the second direction, and the first direction is perpendicular to the second direction; The two shell bodies are folded along the folded edge, the first accommodating groove of one shell body and the other shell body form the first accommodating cavity, the third accommodating groove of one shell body and the other shell body form the second accommodating cavity, and the second accommodating groove of one shell body and the other shell body form the storage cavity.

8. The battery according to claim 7, characterized in that The distance between the first accommodating groove and the second accommodating groove is X, the depth of the first accommodating groove is H, and H and X satisfy the following relationship: 0.5H≤X≤3H.

9. The battery according to claim 6, characterized in that In the second direction, the extension direction of the storage cavity is arranged parallel to the extension direction of the first accommodating cavity; Or in the second direction, the extension direction of the storage cavity is perpendicular to the extension direction of the first accommodating cavity; An extension portion is further provided at one end of the sealing end away from the storage cavity, and the cross section of the extension portion is a polygon.

10. The battery according to claim 6, characterized in that An inner insulating film is provided on the inner surface of the metal shell facing the pole core, the inner insulating film is provided between the metal shell and the pole core, and the inner insulating film covers the pole core; An outer insulating film is disposed on the outer surface of the metal shell facing away from the pole core, and the outer insulating film covers the outer circumference of the metal shell.

11. A battery module thermal management device, characterized in that: It comprises a liquid cooling plate and a plurality of batteries as described in any one of claims 6 to 10, wherein the liquid cooling plate comprises a plurality of cooling plates arranged side by side along a first direction, the battery comprises a battery main body and a heat conductive limiting portion, the heat conductive limiting portion is connected to the battery main body, the battery main body is arranged on one side of the cooling plate, an end of the heat conductive limiting portion away from the battery main body is bent and arranged on a side of the cooling plate away from the battery main body, and the heat conductive limiting portion abuts against the cooling plate toward the side of the battery main body.

12. The battery module thermal management device according to claim 11, characterized in that: The heat-conductive limiting portion includes a vertical portion and a horizontal portion, one end of the vertical portion is connected to the battery main body, and one end of the vertical portion away from the battery main body is connected to the horizontal portion, the vertical portion is arranged between two adjacent cooling plates, and the horizontal portion is arranged on the side of the cooling plate away from the battery main body, and the horizontal portion abuts against the cooling plate; the horizontal portion is arranged parallel to the cooling plate.

13. The battery module thermal management device according to claim 11, characterized in that: The battery module thermal management device further includes a heat conductive member, the heat conductive member includes a plurality of first heat conductive members, the first heat conductive members are arranged between the battery main body and the cooling plate, one side of the first heat conductive member abuts against the battery main body, and the side of the first heat conductive member facing away from the battery main body abuts against the cooling plate; The heat conducting member also includes a plurality of second heat conducting members, the second heat conducting members are filled between the heat conducting limiting portion and the cooling plate, one side of the second heat conducting member abuts against the heat conducting limiting portion, and the side of the heat conducting member away from the heat conducting limiting portion abuts against the cooling plate.

14. The battery module thermal management device according to claim 11, characterized in that: The battery main body includes a metal shell and a pole core. A accommodating cavity is provided in the metal shell, and the pole core is arranged in the accommodating cavity. The heat conductive limiting part is formed at one end of the metal shell, and the interior of the heat conductive limiting part is connected with the accommodating cavity.

15. The battery module thermal management device according to claim 11, characterized in that: The liquid cooling plate also includes a liquid inlet pipe and a liquid outlet pipe. A plurality of cooling channels are arranged in the cooling plate. The liquid inlet pipe is arranged on one side of the cooling plate, and the liquid outlet pipe is arranged on the side of the cooling plate away from the liquid inlet pipe. The cooling channels are respectively connected to the liquid inlet pipe and the liquid outlet pipe.

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