Battery top cover, battery, battery pack, and electrical device

Abstract

A battery top cover, a battery (10), a battery pack, and an electrical device. The battery top cover comprises: a terminal post (100), a lower plastic component (200), a cover plate (300), and a sealing ring (400). The terminal post (100) comprises a base (120) and a column (110) arranged on the base (120). The cover plate (300) is provided with a first terminal post hole (310). The column (110) sequentially passes through the lower plastic component (200), the sealing ring (400), and the first terminal post hole (310). The base (120) is located on a side of the lower plastic component (200) facing away from the cover plate (300). The lower plastic component (200) is provided with an elastic portion. Two ends of the sealing ring (400) respectively abut against the base (120) and the cover plate (300). One side of the lower plastic component (200) elastically abuts against one of the base (120) and the cover plate (300) by means of the elastic portion, and the other side of the lower plastic component (200) directly abuts against the other of the base (120) and the cover plate (300).

Description

Battery cover, battery, battery pack and electrical equipment

[0001] This application claims the priority of two Chinese patent applications filed on the same day, January 30, 2024, with application numbers 202420229688.X and 202410131477.7, respectively. The entire contents of the above applications are incorporated into this application by reference. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a battery top cover, a battery, a battery pack, and an electrical device. Background Art

[0003] The square battery is mainly composed of an aluminum cell shell and a battery top cover. The aluminum cell shell can provide a confined space for the battery cell to accommodate the electrode assembly and electrolyte. The battery top cover includes the electrode column, lower plastic, cover plate and other components. SUMMARY OF THE INVENTION

[0004] The sealing performance of the battery top cover in the related art is poor.

[0005] In the first aspect, the present application provides a battery top cover, comprising: a pole, a lower plastic, a cover plate and a sealing ring, the pole comprising a base and a column arranged on the base, a first pole hole being arranged on the cover plate, the column passing through the lower plastic, the sealing ring and the first pole hole in sequence, the base being located on the side of the lower plastic facing away from the cover plate, and the two ends of the sealing ring respectively abutting the base and the cover plate.

[0006] In a second aspect, the present application further provides a battery, comprising the battery top cover described in any one of the first aspects.

[0007] In a third aspect, the present application further provides a battery, comprising:

[0008] case;

[0009] The battery top cover comprises a cover plate and an upper plastic, wherein the cover plate closes the opening of the shell, and the upper plastic is arranged on a side of the cover plate away from the shell;

[0010] The top cover insulating sheet is arranged on the surface of the cover plate away from the shell, the top cover insulating sheet is provided with a first through hole, the upper plastic passes through the first through hole, and the top cover insulating sheet is attached to the side wall of the upper plastic.

[0011] In a fourth aspect, the present application also provides a battery pack comprising a plurality of the above-mentioned batteries.

[0012] In a fifth aspect, the present application also provides an electrical device, including the battery pack, which is used to provide electrical energy. Beneficial effects

[0013] The battery top cover provided in the present application is formed by passing the column through the lower plastic, the sealing ring and the first pole hole in sequence, and the base is arranged on the side of the lower plastic facing away from the cover plate. The two ends of the sealing ring respectively abut the base and the cover plate, which can ensure the compression range of the sealing ring and improve the sealing performance of the battery top cover, that is, improve the sealing performance of the battery.

[0014] The battery, battery pack, and electrical equipment provided in the present application avoid an assembly gap between the top cover insulating sheet and the upper plastic by attaching the top cover insulating sheet to the side wall of the upper plastic, thereby improving the insulation of the battery top cover, improving the safety of the battery ground, and thus improving the safety of the battery pack and the electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG1 is a schematic diagram of a planar structure of a battery top cover provided by an implementation of the present application;

[0016] FIG2 is a schematic diagram of the three-dimensional structure of a battery top cover provided by an implementation of the present application;

[0017] FIG3 is a schematic diagram of the structure of the connection between the lower plastic and the cover plate provided by an implementation of the present application;

[0018] FIG4 is a schematic diagram of a top view of the lower plastic structure provided by an implementation of the present application;

[0019] FIG5 is a schematic diagram of a partially enlarged structure of position A in FIG4 ;

[0020] FIG6 is a side view of the lower plastic structure provided by an implementation of the present application;

[0021] FIG7 is a schematic diagram of a partially enlarged structure of position B in FIG6 ;

[0022] FIG8 is a schematic diagram of the structure of the connection between the lower plastic and the pole provided by an implementation of the present application;

[0023] FIG9 is a schematic structural diagram of an upper plastic provided by an implementation of the present application;

[0024] FIG10 is a schematic structural diagram of a pole terminal provided by an implementation of the present application;

[0025] FIG11 is a schematic diagram of the internal texture structure of a pole provided by an implementation of the present application;

[0026] FIG12 is a schematic diagram of the internal texture structure of a pole provided by an implementation of the present application;

[0027] FIG13 is a schematic diagram of the internal texture structure of a pole provided by an implementation of the present application;

[0028] FIG14 is a perspective schematic diagram of a battery provided by an implementation of the present application;

[0029] FIG15 is a schematic diagram of an explosion of a battery provided by one implementation of the present application;

[0030] FIG16 is a schematic diagram of the assembly of a battery provided by an implementation of the present application;

[0031] FIG17 is a partially enlarged schematic diagram of a battery provided by one implementation of the present application;

[0032] FIG18 is a top expanded view of a top cover insulating sheet provided by one implementation of the present application;

[0033] FIG19 is an enlarged schematic diagram of the second attachment surface provided by an implementation of the present application.

[0034] The following are the descriptions of the reference numerals:

[0035] 100, pole; 200, lower plastic; 300, cover; 400, sealing ring; 500, upper plastic; 600, pole terminal; 110, column; 120, base; 210, main body; 220, tab; 230, first bottom plate; 240, first side plate; 250, second side plate; 260, third pole hole; 310, first pole hole; 510, second pole hole; 520, third side plate; 530, fourth side plate; 540, second bottom plate; 550, boss; 610, fourth pole hole; 221, connecting portion; 222, abutting portion;

[0036] 10. Battery; 11. Housing; 12. Top cover insulating sheet; 13. First insulating layer;

[0037] 301. First attachment surface; 302. Second attachment surface; 303. Third attachment surface; 304. First through hole; 305. Incision; 306. First fold; 307. Second fold; 308. Edge line. Modes for Carrying Out the Invention

[0038] The inventors have found through research that the sealing ring of the battery top cover in the related art has a narrowed compression control range due to the fixed space limitation, resulting in poor sealing performance of the battery top cover.

[0039] To address the above-mentioned issues, as shown in Figures 1 to 10, this embodiment provides a battery top cover, which includes: a terminal 100, a lower plastic 200, a cover plate 300, and a sealing ring 400. The terminal 100 includes a base 120 and a column 110 disposed on the base 120. The cover plate 300 is provided with a first terminal hole 310. The column 110 passes through the lower plastic 200, the sealing ring 400, and the first terminal hole 310 in sequence. The base 120 is located on the side of the lower plastic 200 facing away from the cover plate 300. An elastic portion is provided on one side of the lower plastic 200. One side of the lower plastic 200 elastically abuts against one of the base 120 and the cover plate 300 via the elastic portion, while the other side directly abuts against the other of the base 120 and the cover plate 300. The direct abutment mentioned here refers only to the elastic portion and does not exclude embodiments in which other components other than the elastic portion are present between the lower plastic 200 and the cover plate 300 or the base 120.

[0040] In some embodiments, an elastic portion is provided on the side of the lower plastic 200 close to the cover plate 300, and the side of the lower plastic 200 close to the cover plate 300 elastically abuts the cover plate 300 through the elastic portion, and the side of the lower plastic 200 close to the base 120 directly abuts the base 120. The elastic portion can elastically expand and contract between the cover plate 300 and the base 120 to adjust the gap between the cover plate 300 and the base 120, and the sealing ring 400 is clamped between the base 120 and the cover plate 300. When the base 120 and the cover plate 300 compress the sealing ring 400, they can get closer to each other, thereby compressing the sealing ring 400 to be thinner, which can ensure the compression range of the sealing ring 400 and improve the sealing performance of the battery top cover.

[0041] In other embodiments, an elastic portion is provided on the side of the lower plastic 200 close to the base 120, and the side of the lower plastic 200 close to the base 120 elastically abuts the base 120 through the elastic portion, and the side of the lower plastic 200 close to the cover plate 300 directly abuts the cover plate 300. The elastic portion can also elastically expand and contract between the cover plate 300 and the base 120 to adjust the gap between the cover plate 300 and the base 120, and the sealing ring 400 is clamped between the base 120 and the cover plate 300. When the base 120 and the cover plate 300 compress the sealing ring 400, they can get closer to each other, thereby compressing the sealing ring 400 to be thinner, thereby ensuring the compression range of the sealing ring 400 and improving the sealing performance of the battery top cover.

[0042] In some embodiments, the cover plate 300 is a plain aluminum plate, and the battery top cover may include at least two lower plastic sheets 200 spaced apart and arranged on different sides of the column 110. Alternatively, the battery top cover may include only one lower plastic sheet 200. Referring to Figures 4 and 8 , when the battery top cover includes one lower plastic sheet 200, the lower plastic sheet 200 is provided with a third terminal hole 260 for the column 110 to pass through.

[0043] In some embodiments, referring to FIG. 4 to FIG. 7 , the lower plastic 200 further includes a main body 210 , and the elastic portion includes a protrusion 220 . The protrusion 220 is connected to the main body 210 and spaced apart from the main body 210 at a non-connected position. In this embodiment, as shown in FIG4 , the elastic portion includes two tabs 220 , which are connected to the main body 210 and spaced apart on the main body 210 . By providing the tabs 220 on a side of the lower plastic 200 close to the cover plate 300 and positioning the third pole hole 260 in a recessed portion formed between the two tabs 220 , a gap is formed between the tabs 220 and the main body 210 in a non-connected position. This allows a certain amount of movable displacement when the base 120 abuts the cover plate 300 through the lower plastic 200. The amount of movable displacement is the gap between the tabs 220 and the main body 210 . The thickness of the compressed portion of the sealing ring 400 is equal to the distance between the base 120 and the cover plate 300. This allows a certain amount of space margin for the sealing ring 400 to buffer compression, thereby improving the sealing performance of the battery top cover.

[0044] In some embodiments, as shown in Figures 4 to 7, the cross section of the protrusion 220 is a trapezoid. As shown in Figure 4, the cross section of the protrusion 220 refers to the cross section of the protrusion 220 in the XZ plane, wherein the X direction is the length direction of the main body 210, and the Z direction is the thickness (height) direction of the main body 210. In combination with Figures 6 and 7, by setting the cross section of the protrusion 220 to be trapezoidal, the protrusion 220 The battery cover comprises connecting portions 221 on both sides and an abutting portion 222 between the two connecting portions 221. The connecting portions 221 are connected to the main body 210, and the abutting portion 222 is spaced apart from the main body 210. The connecting portion 221 on at least one side is tilted. This allows the inclined connecting portion 221 to bend when the base 120 abuts the cover 300 through the lower plastic 200, bringing the abutting portion 222 closer to the main body 210. This elastically compresses the tab 220, reducing the distance between the base 120 and the cover 300. This ensures that the compression range of the sealing ring 400 is maintained, thereby improving the sealing performance of the battery cover. In other embodiments, the cross-section of the tab 220 can also be set to an arc.

[0045] In some embodiments, the elastic portion is integrally molded with the lower plastic 200. By integrally molding the elastic portion with the lower plastic 200, the manufacturing complexity and cost of the battery cover can be reduced. In other embodiments, the elastic portion can also be configured as an elastic component independent of the lower plastic 200, with the elastic coefficient of the elastic component being less than the elastic coefficient of the sealing ring 400.

[0046] In some embodiments, as shown in Figure 8, the lower plastic 200 includes a first bottom plate 230, two first side plates 240 arranged opposite to each other, and two second side plates 250 arranged opposite to each other. The two first side plates 240 and the two second side plates 250 are arranged around the periphery of the first bottom plate 230. The first bottom plate 230, the two first side plates 240 and the two second side plates 250 together form a first accommodating space, and the base 120 is located in the first accommodating space. This arrangement can prevent the base 120 from occupying the internal space of the battery, thereby improving the space utilization of the battery.

[0047] In some embodiments, as shown in Figures 3 and 8, the elastic part includes two elastic parts, which are respectively provided on one side of the two second side plates 250 close to the cover plate 300. The third pole hole 260 is provided on the first bottom plate 230. The length of the second side plate 250 is greater than the length of the elastic part, and the width of the second side plate 250 is greater than or equal to the width of the elastic part. Such an arrangement can form a gap between the cover plate 300 and the lower plastic 200, and the sealing ring 400 has a certain space margin to buffer compression, thereby improving the sealing performance of the battery top cover.

[0048] In one embodiment, the width of the elastic portion is less than or equal to the width of the second side plate 250, and the width of the elastic portion is greater than or equal to two-thirds of the width of the second side plate 250. By setting the width of the elastic portion to be less than or equal to the width of the second side plate 250, the elastic portion can be prevented from occupying additional battery space. By setting the width of the elastic portion to be greater than or equal to two-thirds of the width of the second side plate 250, the compression range of the sealing ring 400 can be ensured, thereby improving the sealing performance of the battery top cover.

[0049] In some embodiments, the sum of the height of the first bottom plate 230 and the height of the base 120 is equal to the height of the second side plate 250. Such an arrangement allows the base 120 to be arranged in the first accommodation space, and the side of the base 120 facing away from the first bottom plate 230 is flush with the side of the second side plate 250 facing away from the cover plate 300, that is, the first accommodation space is sealed by the base 120, thereby improving the sealing performance of the battery top cover.

[0050] In some embodiments, as shown in FIG7 , the ratio of the height h of the tab 220 to the thickness H of the main body 210 is 1:(4-12), where the height of the tab 220 refers to the vertical distance from the vertex of the tab 220 away from the main body 210 to the main body 210, and the thickness of the main body 210 refers to the vertical distance between the side of the main body 210 close to the tab 220 and the side of the main body 210 away from the tab 220. For example, the ratio of the height of the tab 220 to the thickness of the main body 210 can be 1:4, 1:5, 1:6, 1:7, 1:8, 1:9, 1:10, 1:11, 1:12, etc. By setting the height of the tab 220 and the thickness of the main body 210 within this range, a certain amount of space can be provided for the sealing ring 400 to buffer compression, thereby improving the sealing performance of the battery top cover.

[0051] In one example, the thickness H of the main body 210 (i.e., the height of the second side plate 250 ) is 0.6 mm, and the height of the protrusion 220 is 0.05 mm to 0.15 mm. For example, the height of the protrusion 220 is 0.05 mm, 0.1 mm, 0.15 mm, etc. This configuration allows the sealing ring 400 to have a space margin of 0.05 mm to 0.15 mm to buffer compression, thereby improving the sealing performance of the battery top cover.

[0052] In some embodiments, continuing to refer to Figures 1, 2 and 9, the battery top cover also includes an upper plastic 500 and a pole terminal 600. The upper plastic 500 is provided on the side of the cover plate 300 away from the lower plastic. The pole terminal 600 is provided on the side of the upper plastic 500 away from the cover plate 300. A second pole hole 510 is provided on the upper plastic 500. The column 110 passes through the second pole hole 510 and is connected to the pole terminal 600.

[0053] In some embodiments, referring to FIG. 10 , a fourth pole hole 610 is provided on the pole terminal 600 , the column 110 passes through the fourth pole hole 610 , and the outer wall of the column 110 abuts against the inner wall of the fourth pole hole 610 . This arrangement allows the column 110 to be connected to the pole terminal 600 .

[0054] In some embodiments, continuing to refer to Figure 9, the upper plastic 500 includes a second bottom plate 540, two third side plates 520 arranged opposite to each other, and two fourth side plates 530 arranged opposite to each other. The two third side plates 520 and the two fourth side plates 530 are arranged around the second bottom plate 540. The second bottom plate 540, the two third side plates 520 and the two fourth side plates 530 are enclosed to form a second accommodating space. The opening direction of the second accommodating space is in the direction away from the cover plate 300. The pole terminal 600 is located in the second accommodating space. By arranging the pole terminal 600 in the second accommodating space, the pole terminal 600 can be prevented from occupying the internal space of the battery, thereby improving the space utilization of the battery.

[0055] In some embodiments, continuing with reference to FIG9 , the second pole hole 510 is provided on the second base plate 540 , and the edge of the second pole hole 510 protrudes in a direction away from the pole terminal 600 to form a boss 550 , and the boss 550 is inserted into the gap between the outer wall of the column 110 and the inner wall of the first pole hole 310 . This arrangement can seal the gap between the first pole hole 310 and the column 110 through the boss 550 , thereby improving the sealing performance of the battery.

[0056] In some embodiments, one end of the sealing ring 400 abuts against the base 120, and the end of the portion of the sealing ring 400 inserted into the first pole hole 310 abuts against the boss 550. This arrangement can seal the gap between the third pole hole 260 and the column 110 through the sealing ring 400, and seal the gap between the first pole hole 310 and the column 110 through the sealing ring 400 and the boss 550, thereby improving the sealing performance of the battery.

[0057] In some embodiments, a first connection portion is provided at the end of the sealing ring 400 facing away from the base 120, and a second connection portion is provided at the end of the boss 550 facing away from the second bottom plate 540, which matches the first connection portion. The first and second connection portions allow the end of the sealing ring 400 facing away from the base 120 to abut against the end of the boss 550 facing away from the second bottom plate 540, thereby preventing the sealing ring 400 from being displaced after being mounted on the column 110 and improving the sealing performance of the battery top cover. For example, the first connection portion may be a protrusion, and the second connection portion may be a groove matching the protrusion, i.e., the end of the sealing ring 400 facing away from the base 120 and the end of the boss 550 facing away from the second bottom plate 540 abut against each other through the matching protrusion and groove.

[0058] In one example, the shape of the lower plastic and the cover plate 300 can be set according to the shape of the battery to which the battery top cover is applied. For example, when the battery top cover is applied to a square battery, the lower plastic and the cover plate 300 can be a rectangular parallelepiped, which is not limited in this application.

[0059] In some embodiments, the lower plastic is made of PPS material or PSU material. This configuration can improve the insulation performance between the battery top cover and the battery cell, and can also prevent the electrolyte in the battery from corroding the battery top cover and causing a battery short circuit.

[0060] In some embodiments, a cold forging process can be used to integrally form the base 120 and the column 110 to obtain the pole 100. The cold forging process is a processing method that utilizes the plastic deformation of metal under the action of external force and, with the help of a mold, redistributes and transfers the metal volume to form the required parts or blanks. Preparing the pole 100 through the cold forging process can not only improve the utilization rate of the material, but also improve the production efficiency of the pole 100.

[0061] In some embodiments, the pole 100 can be integrally formed using at least three of the following processes: ① blanking → cold heading → punching; ② blanking → cold heading; ③ blanking → bending → cold heading. As can be seen from the cold heading processes listed above, the pole 100 can be integrally formed with the base 120 and the column 110 using the cold heading process in just two to three steps, resulting in a simple and low-cost process.

[0062] The interior of the pole 100, integrally formed using the first cold heading process, is formed with a specific texture structure as shown in FIG11 . This specific texture structure includes multiple lines extending from the first end protrusion of the base 120 to the column 110, and then from the column 110 to the second end of the base 120. The first end is the left end of the base 120 and the second end is the right end of the base 120, or the first end is the right end of the base 120 and the second end is the left end of the base 120. This specific texture structure can increase the mechanical stability of the pole 100. For example, as shown in FIG11 , this specific texture structure includes three lines, which extend from the left end protrusion of the base 120 to the column 110, and then from the column 110 to the right end of the base 120.

[0063] The interior of the pole 100, integrally formed using the second cold heading process, is formed with a specific texture structure as shown in FIG12 . This specific texture structure includes multiple lines, a portion of which extends from the first end of the base 120 toward the axial direction of the column 110, and another portion of which extends from the second end of the base 120 toward the axial direction of the column 110. The first end is the left end of the base 120 and the second end is the right end of the base 120, or the first end is the right end of the base 120 and the second end is the left end of the base 120. This specific texture structure can also increase the mechanical stability of the pole 100. For example, as shown in FIG12 , this specific texture structure includes four lines, two of which extend from the left end of the base 120 toward the axial direction of the column 110, and the other two extend from the right end of the base 120 toward the axial direction of the column 110.

[0064] The interior of the pole 100 obtained by integrally forming using the third cold heading process is formed with a specific texture structure as shown in Figure 13, which includes multiple lines. The multiple lines extend axially from the same end of the base 120 to the column 110. A portion of the lines passes from the first end of the base 120, around the second end of the base 120, and then extends axially into the column 110 along the column 110. Another portion of the lines extends directly from the first end of the base 120 to the column 110, wherein the first end is the left end of the base 120 and the second end is the right end of the base 120, or the first end is the right end of the base 120 and the second end is the left end of the base 120. This specific texture structure can also increase the mechanical stability of the pole 100. For example, as shown in Figure 13, the specific texture structure includes four lines, two of which are routed from the right end of the base 120, bypass the left end of the base 120, and then extend along the axial direction of the column 110 into the column 110, and the other two are routed from the right end of the base 120 directly into the column 110.

[0065] In one example, the shapes of the column 110 and the first base plate 230 can be set as needed. For example, the column 110 is cylindrical, and the first base plate 230 is a rectangular parallelepiped. The shapes of the third post hole 260 and the first post hole 310 are adapted to the shape of the column 110. For example, the column 110 is cylindrical, and the third post hole 260 and the first post hole 310 are circular.

[0066] This embodiment also provides a battery, which includes a battery top cover. The battery top cover in the battery provided by this embodiment is formed by sequentially passing the column 110 through the lower plastic 200, the sealing ring 400 and the first pole hole 310. The base 120 is arranged on the side of the lower plastic away from the cover plate 300, and an elastic portion is provided on one side of the lower plastic 200. The two ends of the sealing ring 400 respectively abut the base 120 and the cover plate 300. One side of the lower plastic 200 elastically abuts one of the base 120 and the cover plate 300 through the elastic portion, and the other side directly abuts the other of the base 120 and the cover plate 300, which can ensure the compression range of the sealing ring 400 and improve the sealing performance of the battery top cover.

[0067] At present, batteries generally include a shell, an electrode assembly and a battery top cover. The electrode assembly is electrically connected to the battery top cover, and the battery top cover covers the opening of the shell. The shell and the battery top cover can be fixed by welding to provide a closed space for the electrode assembly and the electrolyte.

[0068] After the battery cells are assembled, an insulating layer is usually wrapped on their surface, and a top cover insulating sheet is provided on the outer surface of the battery top cover.

[0069] The applicant has noted that in the battery top cover, an assembly gap is often present between the cover plate and the upper plastic, which can easily cause abnormalities such as battery short circuits during later use. Therefore, embodiments of the present application provide a battery, battery pack, and electrical equipment that, by attaching a top cover insulating sheet to the sidewalls of the upper plastic, eliminates the assembly gap between the top cover insulating sheet and the upper plastic, thereby improving the insulation of the battery top cover and enhancing the safety of the battery ground. For a specific solution, please refer to the detailed description below.

[0070] It should be noted that, hereinafter, the terms "battery module", "battery", "battery element", "battery cell" and "battery pack" may be used interchangeably and may refer to any of a variety of rechargeable battery chemistries and configurations, including but not limited to lithium-ion (e.g., lithium-ion phosphate, lithium cobalt oxide, lithium iron phosphate, other lithium metal oxides, etc.), lithium-ion polymer, nickel metal hydride, nickel cadmium, nickel metal hydride, nickel zinc, silver zinc or other battery types / configurations. The term "electric vehicle" is used herein to refer to a fully electric vehicle, also referred to as an EV, a plug-in hybrid vehicle, also referred to as a PHEV, or a hybrid electric vehicle (HEV), wherein the hybrid vehicle employs multiple propulsion sources, one of which is an electric drive system.

[0071] The embodiments of the present application are generally applicable to systems using electric motors, and more specifically, but not exclusively, to electric vehicles using multi-phase electric motors (e.g., inductive motors). Electric vehicles use one or more stored energy sources, such as battery packs, to provide electrical energy to the vehicle. This energy is at least partially used to propel the vehicle. The stored energy can also be used to provide energy required by other vehicle systems, such as vehicle lighting, partitionable heating, ventilation, and air conditioning (HVAC) systems, auxiliary control systems (e.g., sensors, displays, navigation systems, etc.), vehicle entertainment systems (e.g., radio, DVD, MP3, etc.), etc. Conventional electric vehicles include passenger vehicles and vehicles designed to transport goods, examples of which include passenger cars, trucks, electric bicycles, and recreational boats. Electric vehicles also include dedicated work vehicles and carts, some of which can be integrated with forklifts, scissor lifts, lifting and / or articulated boom aerial work platforms, street cleaning systems, conveyor belts, and flatbed transport platforms.

[0072] Specifically, please refer to Figures 14 to 18. Figure 14 is a three-dimensional schematic diagram of the battery provided in an embodiment of the present application. The battery 10 specifically includes a shell 11, a battery top cover and a top cover insulating sheet 12. The battery top cover includes a cover plate 300 and an upper plastic 500. The cover plate 300 closes the opening of the shell 11, and the upper plastic 500 is arranged on the side of the cover plate 300 away from the shell 11; the top cover insulating sheet 12 is arranged on the surface of the cover plate 300 away from the shell 11. The top cover insulating sheet 12 is provided with a first through hole 304, the upper plastic 500 passes through the first through hole 304, and the top cover insulating sheet 12 is attached to the side wall of the upper plastic 500.

[0073] In the embodiment of the present application, by attaching the top cover insulating sheet 12 to the side wall of the upper plastic 500, an assembly gap is avoided between the top cover insulating sheet 12 and the upper plastic 500, thereby improving the insulation of the battery top cover and the safety of the battery 10.

[0074] In some specific embodiments of the present application, the top cover insulating sheet 12 includes a first attachment surface 301 and a second attachment surface 302 . The first attachment surface 301 is attached to the surface of the cover plate 300 away from the housing 11 , and the second attachment surface 302 is attached to the side wall of the upper plastic 500 .

[0075] In some embodiments of the present application, the ratio of the height of the second attachment surface 302 to the sidewall of the upper plastic 500 is in the range of [0.15, 0.7]. This ensures that the second attachment surface 302 does not affect the normal operation of the battery 10, while also eliminating the assembly gap between the cover 300 and the upper plastic 500, ensuring that it is not easily detached later, thereby improving the long-term safety of the battery 10.

[0076] In a specific embodiment of the present application, the height of the second attachment surface 302 attached to the sidewall of the upper plastic 500 ranges from 0.5 to 2 mm.

[0077] In some embodiments of the present application, a first insulating layer 13 is provided on the outer surface of the shell 11; along the length direction of the battery 10, the end of the first insulating layer 13 close to the battery top cover and the end of the shell 11 close to the battery top cover maintain a preset length distance; the top cover insulating sheet 12 also includes a third attachment surface 303, the third attachment surface 303 is attached to the outer surface of the shell 11, and the attachment length of the third attachment surface 303 is greater than or equal to the preset length, so that the top cover insulating sheet 12 is connected to the first insulating layer 13. In this way, by keeping a preset length between the end of the first insulating layer 13 close to the battery top cover and the end of the shell 11 close to the battery top cover, the first insulating layer 13 can be prevented from forming a folding area on the outer surface of the cover plate 300, thereby preventing unevenness and warping on the outer surface of the cover plate 300. Then, the third attachment surface 303 of the top cover insulating sheet 12 is attached to the outer surface of the shell 11, and the attachment length of the third attachment surface 303 is greater than or equal to the preset length, so that the top cover insulating sheet 12 is connected to the first insulating layer 13, thereby ensuring the sealing and insulation between the shell and the battery top cover.

[0078] In some embodiments of the present application, the preset length range is 5-10 mm. In this way, the overlapping area between the top cover insulating sheet 12 and the first insulating layer 13 can be reduced, the thickening area of ​​the battery cell can be minimized, and the production is facilitated.

[0079] In some embodiments of the present application, the size range of the connection between the top cover insulating sheet 12 and the first insulating layer 13 is (0, 10 cm). In this way, it can be ensured that there is a certain overlapping area between the top cover insulating sheet 12 and the first insulating layer 13, thereby avoiding the separation of the two later, thereby exposing the battery 10 and reducing the risk of insulation problems in the battery 10.

[0080] In some embodiments of the present application, the shell 11 is a square shell 11 , and the battery top cover and the top cover insulating sheet 12 are square structures and are adapted to the shape of the ends of the shell 11 along the length direction of the battery 10 .

[0081] In some embodiments of the present application, as shown in FIG19 , a notch 305 is provided on the second attachment surface 302. The second attachment surface 302 has a distal end facing the first attachment surface 301 and a proximal end away from the first attachment surface 301. The second attachment surface 302 has a first edge located on the proximal end side and a second edge located on the distal end side. Both the first and second edges are rectangular in shape. The notch 305 is formed at the line connecting the vertex of the first edge and the adjacent vertex of the second edge. This facilitates the early assembly of the top cover insulation sheet 12.

[0082] The “center” in the proximal end and the distal end refers to the center of the diagonal line of the first edge and the second edge.

[0083] In a specific embodiment of the present application, the top cover insulation sheet 12 may have four cutouts 305 at the same time.

[0084] In some embodiments of the present application, the first attachment surface 301 , the second attachment surface 302 , and the third attachment surface 303 are integrally formed, thereby ensuring the overall sealing and insulation properties of the top cover insulation sheet 12 .

[0085] In an embodiment of the present application, the first attachment surface 301, the second attachment surface 302 and the third attachment surface 303 are in the unfolded state, as shown in Figure 18, and the top cover insulation sheet 12 has a first fold 306 and a second fold 307 and an edge line 308 corresponding to the first through hole 304, wherein the first attachment surface 301 corresponds to the area between the first fold 306 and the second fold 307, the area between the first fold 306 and the edge line 308 corresponds to the second attachment surface 302, and the third attachment surface 303 corresponds to the area outside the second fold 307.

[0086] It should be noted that the first edge corresponds to the edge line 308 , and the second edge corresponds to the first fold 306 .

[0087] In some embodiments of the present application, electrolyte-resistant protective glue is provided between the upper plastic 500 and the cover 300 to prevent the electrolyte from seeping into the gap between the upper plastic 500 and the cover 300. This avoids the risk of the electrolyte flowing into the assembly gap between the upper plastic 500 and the cover 300.

[0088] Among them, the electrolyte-resistant protective glue may include polyurethane glue and polyester elastic glue.

[0089] In some embodiments of the present application, the battery top cover may further include a pole 100, a sealing ring 400, a lower plastic 200 and a pole terminal 600. During the assembly process, the electrode assembly can be first set in the shell 11, and then the battery top cover can be assembled, such as setting the sealing ring 400 on the pole 100, and then setting the lower plastic 200 and the upper plastic 500 on the cover plate 300, and then the pole 100 is sequentially passed through the lower plastic 200, the cover plate 300, and the upper plastic 500, and then the pole terminal 600 is set on the top of the pole 100. After completing the assembly of the battery top cover, the battery top cover can be assembled with the shell 11, including the connection between the pole 100 and the electrode assembly, and the sealing process of the battery top cover and the shell 11. After completing the above assembly steps, a first insulating layer 13 can be set on the shell 11, and then a top cover insulating sheet 12 can be set on the battery top cover.

[0090] It should be noted that the first insulating layer 13 may also be provided on the housing 11 in advance.

[0091] In addition, the present application also provides a battery pack, which includes multiple batteries 10.

[0092] In the embodiment of the present application, by attaching the top cover insulating sheet 12 to the side wall of the upper plastic 500, an assembly gap is avoided between the top cover insulating sheet 12 and the upper plastic 500, thereby improving the insulation of the battery top cover, improving the safety of the battery 10, and improving the overall safety of the battery pack.

[0093] Furthermore, the present application also provides an electrical device, which includes a battery pack for providing electrical energy.

[0094] The electrical equipment includes but is not limited to new energy vehicles.

[0095] In the embodiment of the present application, by attaching the top cover insulating sheet 12 to the side wall of the upper plastic 500, an assembly gap is avoided between the top cover insulating sheet 12 and the upper plastic 500, thereby improving the insulation of the battery top cover, improving the safety of the battery 10, further improving the overall safety of the battery pack, and further improving the safety of electrical equipment.

Claims

1. A battery top cover, comprising: A pole, a lower plastic, a cover plate and a sealing ring. The pole includes a base and a column arranged on the base. The cover plate is provided with a first pole hole. The column passes through the lower plastic, the sealing ring and the first pole hole in sequence. The base is located on the side of the lower plastic away from the cover plate. The two ends of the sealing ring respectively abut the base and the cover plate.

2. The battery top cover according to claim 1, wherein: An elastic portion is provided on one side of the lower plastic. One side of the lower plastic elastically abuts against one of the base and the cover through the elastic portion, and the other side directly abuts against the other of the base and the cover.

3. The battery top cover according to claim 2, wherein: The lower plastic further includes a main body, and the elastic part includes a convex piece connected to the main body and spaced apart from the main body at a non-connected portion.

4. The battery top cover according to claim 3, wherein: The protruding piece includes connecting parts on both sides and an abutting part between the two connecting parts. The connecting parts are connected to the main body. The abutting part is spaced apart from the main body. The connecting part on at least one side is inclined.

5. The battery top cover according to claim 2, wherein: The elastic portion is integrally formed with the lower plastic.

6. The battery top cover according to claim 2, wherein: The lower plastic includes a first bottom plate, two first side plates arranged opposite to each other, and two second side plates arranged opposite to each other. The two first side plates and the two second side plates are arranged around the periphery of the first bottom plate. The first bottom plate, the two first side plates, and the two second side plates together form a first accommodating space, and the base is located in the first accommodating space.

7. The battery top cover according to claim 6, wherein: The elastic parts include two, and the two elastic parts are respectively arranged on one side of the two second side plates close to the cover plate. The length of the second side plate is greater than the length of the elastic part, and the width of the second side plate is greater than or equal to the width of the elastic part.

8. The battery top cover according to claim 1, further comprising an upper plastic and a pole terminal, wherein the upper plastic is provided on a side of the cover plate facing away from the lower plastic, and the pole terminal is provided on a side of the upper plastic facing away from the cover plate, a second pole hole is provided on the upper plastic, the column passes through the second pole hole and is connected to the pole terminal, an edge of the second pole hole protrudes in a direction away from the pole terminal to form a boss, and the boss is inserted into a gap between the outer wall of the column and the inner wall of the first pole hole.

9. The battery top cover according to claim 8, wherein: The end portion of the sealing ring inserted into the first pole hole abuts against the boss.

10. The battery top cover according to claim 3, wherein: The ratio of the height of the protruding piece to the thickness of the main body is 1:(4-12).

11. The battery top cover according to any one of claims 1 to 10, wherein: The base and the column are integrally formed.

12. The battery top cover according to claim 11, wherein a texture structure is formed inside the terminal, and the texture structure comprises multiple stripes; The plurality of lines extend from the first end of the base through the column to the second end of the base; or, A portion of the plurality of lines extends from the first end of the base toward the axial direction of the column, and another portion of the plurality of lines extends from the second end of the base toward the axial direction of the column; or, A portion of the plurality of lines passes from the first end of the base around the second end of the base and then extends into the column along the axial direction of the column, and another portion of the plurality of lines extends directly from the first end of the base into the column.

13. A battery comprising: case; The battery top cover according to any one of claims 1 to 7 and 10 to 12, wherein the cover plate closes the opening of the housing, and the battery top cover further comprises an upper plastic; The top cover insulating sheet is arranged on the surface of the cover plate away from the shell, the top cover insulating sheet is provided with a first through hole, the upper plastic passes through the first through hole, and the top cover insulating sheet is attached to the side wall of the upper plastic.

14. The battery according to claim 13, wherein The top cover insulating sheet includes a first attachment surface and a second attachment surface. The first attachment surface is attached to the surface of the cover plate away from the housing, and the second attachment surface is attached to the side wall of the upper plastic.

15. The battery according to claim 14, wherein The ratio of the height of the second attachment surface to the side wall of the upper plastic is in the range of [0.15, 0.7].

16. The battery according to claim 14, wherein The outer surface of the shell is provided with a first insulating layer; Along the length direction of the battery, a distance of a preset length is maintained between an end of the first insulating layer close to the battery top cover and an end of the shell close to the battery top cover; The top cover insulation sheet further includes a third attachment surface, which is attached to the outer surface of the shell. The attachment length of the third attachment surface is greater than or equal to the preset length, so that the top cover insulation sheet is connected to the first insulation layer.

17. The battery according to claim 14, wherein A cutout is provided on the second attachment surface, the second attachment surface having a distal end facing the first attachment surface and a proximal end away from the first attachment surface, the second attachment surface having a first edge located on the side of the proximal end and a second edge located on the side of the distal end, the first edge and the second edge are both rectangular in shape, and the cutout is opened at the line connecting the vertex of the first edge and the adjacent vertex of the second edge.

18. The battery according to claim 16, wherein The first attachment surface, the second attachment surface and the third attachment surface are integrally formed.

19. The battery according to claim 16, wherein The size range of the connection between the top cover insulation sheet and the first insulation layer is (0,10cm].

20. The battery according to any one of claims 13 to 19, wherein Electrolyte-resistant protective glue is provided between the upper plastic and the cover plate to prevent the electrolyte from penetrating between the upper plastic and the cover plate.

21. A battery pack comprising a plurality of batteries according to any one of claims 13 to 20.

22. An electrical device comprising the battery pack according to claim 21, wherein the battery pack is configured to provide electrical energy.

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