Cover plate assembly and battery

Abstract

Provided are a cover plate assembly and a battery, relating to the field of battery structures. The cover plate assembly comprises poles (101) and a cover plate body (102); each pole (101) comprises a penetrating part (104) and a compressing part (105); the penetrating part (104) and the compressing part (105) are of an integrated structure; mounting holes (103) are formed in the cover plate body (102); the penetrating part (104) penetrates through a corresponding mounting hole (103) so as to be connected to an electrode group; on the outer side of the cover plate body (102), a material of the pole (101) flows outwards to form the compressing part (105) compressed on the outer side of the cover plate body (102), so that the pole (101) is formed and mounted at the corresponding mounting hole (103). According to the provided cover plate assembly, a riveting block structure in the prior art is omitted, thereby reducing the number of parts, and improving the production efficiency. Moreover, a cold heading process is performed on the poles (101), so that the compressing parts (105) are formed on the outer side of the cover plate body (102), thereby realizing the mounting and fixing of the poles (101), reducing material consumption, reducing the overall height of the poles (101) and heights of outer poles (101), and improving the battery capacity.

Description

Cover assembly and battery

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application with application number CN202323260798.7 and title “Cover assembly and battery” filed with the Patent Office of China on November 30, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of battery structures, and in particular to a cover plate assembly and a battery. Background Art

[0004] As the core component of a lithium-ion battery, the battery cell primarily consists of external insulation, an encapsulated electrode assembly, internal insulation within a cover plate, and electrical connections. The electrode assembly within the cell connects to the electrode posts on the cover plate, leading to the positive and negative electrodes, respectively, to complete the circuit. Currently, most cell covers utilize a riveted connection structure, with both the positive and negative electrode posts riveted together to securely fit the corresponding rivet blocks.

[0005] The battery cover adopts the above-mentioned connection structure, which makes the overall height of the pole and the height of the outer pole higher, uses more materials, is heavy, and the overall cost of the cover is high, and the battery capacity cannot be increased.

[0006] Application Contents

[0007] In view of this, the present application proposes a cover plate assembly and a battery, which can reduce the overall height of the pole and the height of the outer pole, reduce the material used for the pole, and reduce weight and cost.

[0008] In a first aspect, the present application provides a cover plate assembly, comprising a pole and a cover plate body;

[0009] The pole comprises a through portion and a pressing portion, wherein the through portion and the pressing portion are an integral structure;

[0010] The cover plate body is provided with a mounting hole, and the through portion passes through the mounting hole to be connected to the electrode group;

[0011] On the outer side of the cover plate body, the material of the pole flows outward to form the pressing portion which is pressed on the outer side of the cover plate body, so that the pole is formed and installed at the installation hole.

[0012] Beneficial effect: On the outside of the cover body, the outer ring of the pole is locally pressed so that the outer ring of the outer surface of the pole is locally stressed. On a plane perpendicular to the direction of the pressing, the material of the pole flows outward in the circumferential direction to form a pressing portion pressed on the outside of the cover body, so that the pole is formed and installed in the installation hole.

[0013] In other words, the present application eliminates the structure of the riveted block in the prior art, which can reduce the number of parts and improve production efficiency; and adopts a cold heading process for the pole so that its piercing portion is formed on the outside of the cover body, thereby realizing the installation and fixation of the pole, which can reduce material consumption, reduce the overall height of the pole and the height of the outer pole, and improve the battery capacity.

[0014] In an optional embodiment, the height of the pole is between 3.5 mm and 6.5 mm;

[0015] And / or, on the outer side of the cover body, a distance between a surface of the pole away from the cover body and an outer surface of the cover body is between 2 mm and 3 mm.

[0016] Beneficial effect: The lower height of the pole can reduce material usage and weight, thereby reducing the overall cost of the cover assembly.

[0017] In an optional embodiment, the coverage of the pressing portion is larger than the cross-sectional range of the mounting hole.

[0018] Beneficial effect: The structural strength of the pole and the cover plate after installation can be ensured.

[0019] In an optional embodiment, the pole is formed of a copper-aluminum composite plate.

[0020] Beneficial effect: It can further reduce the material used for the pole and reduce the weight of the cover assembly.

[0021] In an optional embodiment, an annular gasket is further included, which is located between the cover plate body and the pressing portion. The pole passes through the annular gasket, and the pressing portion is pressed on the annular gasket.

[0022] In an optional embodiment, it further includes a first isolating member;

[0023] The first isolating member is located between the cover plate body and the annular gasket, and the penetrating portion penetrates the first isolating member;

[0024] The first isolating member includes a first covering portion and a first surrounding portion; the first covering portion covers the outer side of the cover plate body, and the annular gasket is pressed on the first covering portion; the first surrounding portion is placed in the mounting hole, and the first surrounding portion surrounds the circumference of the through portion.

[0025] Beneficial effect: the cover plate body and the annular gasket can be clamped and fixed to the first isolating member, thereby insulating the cover plate body from the pole.

[0026] In an optional embodiment, a sunken groove is provided at the edge of the mounting hole on the outer side of the cover plate body, and the first covering portion is embedded in the sunken groove.

[0027] In an optional embodiment, a second isolating member is further included;

[0028] The second isolating member is located on the inner side of the cover body, and the second isolating member is provided with a locking hole;

[0029] The pole further includes a rotation-stopping portion; the rotation-stopping portion is located on the inner side of the cover body, and the rotation-stopping portion is connected to an end of the through portion away from the pressing portion;

[0030] The anti-rotation locking portion is locked in the locking hole.

[0031] Beneficial effect: The second isolating member can insulate the electrode group from the cover plate body.

[0032] In an optional embodiment, the anti-rotation locking portion is provided with an anti-fouling structure, and the locking hole is adaptively connected to the anti-rotation locking portion.

[0033] Another object of the present application is to provide a battery comprising the cover assembly described in the above solution.

[0034] The battery has the same beneficial effects as the above-mentioned cover assembly, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific implementation methods or the description of the prior art. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0036] FIG1 is a partial cross-sectional structural diagram of a cover plate assembly provided in the present application;

[0037] FIG2 is a schematic diagram of the exploded structure of the cover plate assembly provided in this application;

[0038] FIG3 is a schematic structural diagram of the cover assembly provided by the present application at a first viewing angle;

[0039] FIG4 is a schematic structural diagram of the cover assembly provided by the present application at a second viewing angle;

[0040] FIG5 is a schematic diagram of the structure of the pole provided in this application.

[0041] Description of reference numerals:

[0042] 101-pole; 102-cover body; 103-mounting hole; 104-through portion; 105-piercing portion; 106-annular gasket; 107-first isolator; 108-sunk groove; 109-second isolator; 110-stop-rotation locking portion; 111-locking hole; 112-raised portion; 113-chamfer; 114-sealing ring; 115-explosion-proof valve; 116-protective sheet. DETAILED DESCRIPTION

[0043] To make the purpose, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts shall fall within the scope of protection of this application.

[0044] Example 1

[0045] 1 to 5 , the cover assembly provided herein includes a pole 101 and a cover body 102. The cover body 102 is specifically manufactured from a bare aluminum sheet. To ensure structural strength and the flow area of ​​the subsequent battery cells, the width of the cover body 102 is between 35 mm and 55 mm, and the length of the cover body 102 is between 250 mm and 320 mm.

[0046] The cover body 102 is provided with a mounting hole 103, and the mounting hole 103 is used to fix the pole 101. The pole 101 includes a through portion 104 and a pressing portion 105, and the through portion 104 and the pressing portion 105 are an integral structure. The through portion 104 passes through the mounting hole 103 to connect with the pole group on the inner side of the cover body 102. In the actual production process, the outer ring of the pole 101 is generally locally pressed on the outside of the cover body 102, so that the outer ring of the upper surface of the pole 101 shown in Figures 1 and 5 is locally stressed. On a plane perpendicular to the pressing direction, the material of the pole 101 flows outward in a circumferential direction to form the pressing portion 105 pressed on the outside of the cover body 102, so that the pole 101 is formed and installed at the mounting hole 103.

[0047] In other words, the present application eliminates the structure of the riveted block in the prior art, which can reduce the number of parts and improve production efficiency; and adopts a cold heading process for the pole 101 so that its piercing portion 105 is formed on the outside of the cover plate body 102, thereby realizing the installation and fixation of the pole 101, which can reduce the material consumption, reduce the overall height of the pole 101 and the height of the outer pole 101, and improve the battery capacity.

[0048] In an optional solution of this embodiment, as shown in Figure 1, the height H1 of the pole 101 is between 3.5 mm and 6.5 mm. Preferably, the height of the pole 101 is 5.8 mm. The lower height of the pole 101 can reduce material usage and reduce weight, thereby reducing the overall cost of the cover assembly. On the outside of the cover body 102, the distance between the surface of the pole 101 away from the cover body 102 and the outer surface of the cover body 102 (i.e., the height H2 of the outer pole 101) is between 2 mm and 3 mm. Preferably, the height of the outer pole 101 is 2.5 mm, which occupies less space in the battery and can improve the overall capacity of the battery.

[0049] In an optional solution of this embodiment, the coverage of the pressing portion 105 is larger than the cross-sectional range of the mounting hole 103 , so as to ensure the structural strength of the pole 101 and the cover plate body 102 after installation.

[0050] In an optional solution of this embodiment, the pole 101 is formed of a copper-aluminum composite plate, and before the pole 101 is cold-forged, a stamping process is used to form the remaining structure except the cold-forged portion, which can further reduce the material used for the pole 101 and reduce the weight of the cover plate assembly.

[0051] In an optional solution of this embodiment, the cover plate assembly further includes an annular gasket 106 , which is located between the cover plate body 102 and the pressing portion 105 . The through portion 104 of the pole 101 passes through the annular gasket 106 , and the pressing portion 105 is pressed against the annular gasket 106 .

[0052] In this embodiment, the annular gasket 106 is made of a high-strength, pressure-resistant material to provide high structural strength. Specifically, the annular gasket 106 can be a stainless steel gasket. The annular gasket 106 can be manufactured using a stamping process. As shown in FIG1 , the thickness H3 of the annular gasket 106 is in the range of 0.4 mm to 0.8 mm. Preferably, the thickness of the annular gasket 106 is 0.6 mm.

[0053] In an optional solution of this embodiment, the cover plate assembly further includes a first isolating member 107. The first isolating member 107 is located between the cover plate body 102 and the annular gasket 106, and the penetration portion 104 penetrates the first isolating member 107. That is, the cover plate body 102 and the annular gasket 106 can clamp and fix the first isolating member 107, thereby insulating the cover plate body 102 from the pole 101.

[0054] Specifically, the first isolator 107 includes a first covering portion and a first surrounding portion. The first covering portion covers the outside of the cover body 102 and insulates the cover body 102 from the pressing portion 105 of the pole 101. The annular gasket 106 is pressed against the first covering portion to position the first covering portion. The first surrounding portion is positioned within the mounting hole 103 and surrounds the through-hole 104. The first surrounding portion insulates the cover body 102 from the through-hole 104 of the pole 101 at the mounting hole 103.

[0055] In this embodiment, referring to FIG. 1 and FIG. 2 , the first isolating member 107 is specifically an upper plastic with insulating properties. By pressing the pole 101 , the pressing portion 105 , the annular gasket 106 , the upper plastic, and the bare aluminum sheet are tightly fitted together, so that the above structures are reliably assembled, thereby ensuring insulation and withstand voltage between the pole 101 and the cover plate body 102 .

[0056] Specifically, the upper plastic is divided into the positive electrode upper plastic and the negative electrode upper plastic. The positive electrode upper plastic is made of POK (polyketone) + CF (carbon fiber) reinforced material, while the negative electrode upper plastic is made of POK. The use of POK material is mainly for high temperature resistance and improved toughness of the upper plastic, preventing cracking during the pier pressing process. As shown in Figure 1, the thickness H4 of the first covering portion of the upper plastic is controlled within the range of 0.4mm to 0.7mm. Preferably, the thickness of the first covering portion is 0.6mm.

[0057] In an optional solution of this embodiment, as shown in Figure 2, a circular sunken groove 108 is provided at the edge of the mounting hole 103 on the outer side of the cover body 102, and the first cover portion is circular and embedded in the sunken groove 108, so that the first cover portion can be clamped in the sunken groove 108, further improving the fixing effect of the first isolation member 107.

[0058] Example 2

[0059] The cover plate assembly in this second embodiment is an improvement on the above embodiment. The technical contents disclosed in the above embodiment will not be described repeatedly, and the contents disclosed in the above embodiment also belong to the contents disclosed in this second embodiment.

[0060] As shown in Figures 2 and 4, in an optional solution of this embodiment, the cover assembly further includes a second isolating member 109. The second isolating member 109 is located on the inner side of the cover body 102 to insulate the pole group from the cover body 102. The pole 101 further includes a stop-rotation latch 110, which is located on the inner side of the cover body 102 and is connected to the end of the through-portion 104 away from the piercing portion 105. The second isolating member 109 is provided with a latching hole 111, and the stop-rotation latch 110 is latched in the latching hole 111. The second isolating member 109 can fix the pole 101 from the inner side of the cover body 102 and can prevent the pole 101 from rotating.

[0061] In this embodiment, the second isolating member 109 is specifically a lower plastic with insulating properties. A square sunken groove 108 is provided at the edge of the mounting hole 103 on the inner side of the cover body 102, and a square protrusion 112 is provided at the positioning hole 111 of the second isolating member 109. The protrusion 112 is embedded and installed in the sunken groove 108, so that the second isolating member 109 is clamped in the sunken groove 108, further improving the fixing effect of the second isolating member 109, thereby ensuring the insulation and voltage resistance between the pole 101 and the cover body 102.

[0062] Optionally, the pressing portion 105 of the pole 101 is circular, the through portion 104 is cylindrical, and the anti-rotation retaining portion 110 is square. Compared to a circular structure, the square-cornered structure of the anti-rotation retaining portion 110 can enhance the ultimate torque, thereby enabling the anti-rotation retaining portion 110 to achieve its anti-rotation function. Of course, the anti-rotation retaining portion 110 can also be configured as other shapes with sharp corners to still function as an anti-rotation function.

[0063] Furthermore, the anti-rotation latch 110 is provided with a fool-proof structure, and the latch hole 111 is adapted to connect with the anti-rotation latch 110. When the anti-rotation latch 110 of the pole 101 is connected to the latch hole 111, the fool-proof structure can prevent the pole 101 from being installed in the wrong direction. As shown in Figures 4 and 5, specifically, one corner of the anti-rotation latch 110 of the positive and negative poles 101 is provided with a 30-degree chamfer 113 to prevent fool-proof design. The lower plastic is provided with a corresponding latch hole 111 of the same shape, which plays a fool-proof role when the two are assembled.

[0064] In an optional solution of this embodiment, as shown in FIG2 , the cover assembly further includes a sealing ring 114 positioned between the cover body 102 and the lower plastic. The sealing ring 114 is positioned inside the mounting hole 103 to seal the gap between the pole 101 and the mounting hole 103. Specifically, the sealing ring 114 includes a second covering portion and a second surrounding portion. The second covering portion covers the inside of the cover body 102, and the anti-rotation locking portion 110 is pressed against the second covering portion. The second surrounding portion is positioned within the mounting hole 103 and surrounds the circumference of the through portion 104.

[0065] In an optional solution of this embodiment, as shown in FIG2 , the cover plate assembly further includes an explosion-proof valve 115 and a protective sheet 116. The cover plate body 102 is provided with a fixing hole for mounting the explosion-proof valve 115, and the explosion-proof valve 115 is located between the positive and negative poles 101. A protective sheet 116 is also provided on the outside of the explosion-proof valve 115.

[0066] Example 3

[0067] Embodiment 3 of the present application provides a battery, including the cover assembly of any of the above embodiments, and thus has all the beneficial technical effects of the cover assembly of any of the above embodiments, which will not be repeated here.

[0068] Although the embodiments of the present application have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present application, and such modifications and variations shall fall within the scope defined by the appended claims. Industrial Applicability

[0069] The cover plate assembly provided in the present application includes a pole and a cover plate body, and the cover plate body is provided with a mounting hole, and the mounting hole is used to fix the pole. The pole includes a through-hole and a piercing part, and the through-hole and the piercing part are an integral structure. The through-hole passes through the mounting hole to connect with the pole group on the inner side of the cover plate body. On the outside of the cover plate body, the outer ring of the pole is locally pierced so that the outer ring of the outer surface of the pole is locally stressed. On a plane perpendicular to the piercing pressure direction, the material of the pole flows outward in a circumferential direction to form a piercing part pressed on the outside of the cover plate body, so that the pole is formed and installed at the mounting hole. The present application eliminates the structure of the riveting block in the prior art, which can reduce the number of parts and improve production efficiency; and adopts a cold heading process for the pole so that the piercing part is formed on the outside of the cover plate body, thereby realizing the installation and fixation of the pole, which can reduce the material consumption, reduce the overall height of the pole and the height of the outer pole, and improve the battery capacity.

Claims

1. A cover plate assembly, characterized in that: It includes a pole and a cover body; The pole comprises a penetration portion and a pressing portion, wherein the penetration portion and the pressing portion are an integral structure; The cover plate body is provided with a mounting hole, and the penetration portion penetrates through the mounting hole to be connected with the pole group; On the outer side of the cover plate body, the material of the pole flows outward to form the pressing portion which is pressed on the outer side of the cover plate body, so that the pole is formed and installed at the installation hole.

2. The cover plate assembly according to claim 1, characterized in that: The height of the pole is between 3.5 mm and 6.5 mm; And / or, on the outer side of the cover plate body, the distance between the surface of the pole away from the cover plate body and the outer surface of the cover plate body is between 2 mm and 3 mm.

3. The cover plate assembly according to claim 1, characterized in that: The coverage of the pressing portion is larger than the cross-sectional range of the mounting hole.

4. The cover plate assembly according to claim 1, characterized in that: The pole is formed of a copper-aluminum composite plate.

5. The cover plate assembly according to claim 1, characterized in that: It also includes an annular gasket, which is located between the cover plate body and the pressing portion, the penetration portion penetrates the annular gasket, and the pressing portion is pressed on the annular gasket.

6. The cover plate assembly according to claim 5, characterized in that: Also included is a first isolator; The first isolating member is located between the cover plate body and the annular gasket, and the penetration portion penetrates the first isolating member; The first isolating member includes a first covering portion and a first surrounding portion; the first covering portion covers the outer side of the cover plate body, and the annular gasket is pressed on the first covering portion; the first surrounding portion is placed in the mounting hole, and the first surrounding portion surrounds the circumference of the through portion.

7. The cover plate assembly according to claim 6, characterized in that: A sinking groove is arranged at the edge of the mounting hole on the outer side of the cover plate body, and the first covering part is embedded in the sinking groove.

8. The cover plate assembly according to claim 1, characterized in that: Also comprising a second spacer; The second isolating member is located on the inner side of the cover plate body, and the second isolating member is provided with a locking hole; The pole further includes a rotation-stopping portion; the rotation-stopping portion is located on the inner side of the cover plate body, and the rotation-stopping portion is connected to an end of the penetration portion away from the abutment portion; The anti-rotation locking portion is locked in the locking hole.

9. The cover plate assembly according to claim 8, characterized in that: The anti-rotation clamping portion is provided with an anti-fool structure, and the clamping hole is adaptively connected to the anti-rotation clamping portion.

10. A battery, characterized in that: The invention comprises the cover plate assembly according to any one of claims 1 to 9.

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