A power battery top cover structure

Abstract

The present invention discloses a power battery top cover structure, including a cover plate and a pole assembly, a pole hole is provided on the cover plate, the pole assembly is fixedly connected to the cover plate through the pole hole, and the pole assembly includes a pole body; the pole body includes a conductive part and a limiting part; a plastic ring is fixedly connected to the second end of the conductive part; a sealing ring is also sleeved on the conductive part, and a sealing ring and a connecting ring for pressing the sealing ring toward the limiting part are sequentially arranged between the plastic ring and the limiting part; the pole hole includes a mounting groove; the first end face of the connecting ring is fixedly connected to the bottom of the mounting groove. The connecting ring generates a force in the direction of the limiting part to press the sealing ring, so that the sealing ring reaches a predetermined compression amount, thereby ensuring the airtightness of the pole assembly; then the connecting ring is fixedly connected to the pole hole to complete the installation of the pole assembly; there is no need to compress the sealing ring through a pressing arm device, which reduces the process steps, while ensuring the airtightness of the overall structure and improving the qualified rate of the product.

Description

Technical Field

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

[0002] With the growing development of the new energy industry, power batteries, as a key component of the new energy industry, have received more and more attention in their research and development; power batteries have the advantages of light weight, high capacity, long life, low self-discharge rate, no memory effect, and no pollution. In particular, power batteries are widely used in electric bicycles, electric hardware tools and other equipment, and the application of power batteries in these equipment has advantages.

[0003] In the prior art, the power battery cover plate adopts the method of welding the assembled sealing ring to the cover plate after the pole assembly is processed and formed, and the welding equipment acts on the pole surface through the pressure arm to press the sealing ring, and then welding is performed; this process will cause insufficient compression of the sealing ring, causing leakage, and reducing the qualified rate of the product.

[0004] In view of this, it is necessary to improve the power battery cover in the prior art to solve the technical problem that when the sealing ring is compressed by the pressure arm, the sealing ring is easily not compressed enough, resulting in air leakage. Summary of the invention

[0005] The purpose of the present invention is to provide a power battery top cover structure to solve the above technical problems.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A power battery top cover structure comprises a cover plate and a pole assembly, wherein the cover plate is provided with a pole hole, the pole assembly is fixedly connected to the cover plate through the pole hole, and the pole assembly comprises a pole body;

[0008] The pole body includes a conductive portion and a limiting portion arranged around a first end of the conductive portion; the second end of the conductive portion passes through the pole hole and is fixedly connected with a plastic ring, and the plastic ring is arranged around the second end of the conductive portion;

[0009] The conductive part is also sleeved with an elastic sealing ring, and the sealing ring and a connecting ring for pressing the sealing ring toward the limiting part are sequentially arranged between the plastic ring and the limiting part;

[0010] The pole hole comprises a mounting groove and a mounting through hole extending from the bottom of the mounting groove through the cover plate;

[0011] The first end surface of the connecting ring is fixedly connected to the bottom of the mounting groove.

[0012] Optionally, the plastic ring includes a body and a connecting portion protruding from the body, the connecting portion extending along a vertical direction and a first direction; the first direction is a direction from the edge of the pole body toward the central axis of the pole body;

[0013] A gap portion is formed between the body and the sealing ring, and the connecting ring is embedded and installed in the gap portion and fixedly connected to the body.

[0014] Optionally, a fixing groove for mounting the plastic ring is provided at the second end of the conductive portion, and the connecting portion is embedded in the fixing groove and fixedly connected to the conductive portion.

[0015] Optionally, the first end surface of the sealing ring abuts against the conductive portion, and the second end surface of the sealing ring abuts against the connecting portion.

[0016] Optionally, the connecting ring includes a first ring portion, a second ring portion and a third ring portion, the first ring portion is connected to an upper end of the second ring portion, and the third ring portion is connected to a lower end of the second ring portion;

[0017] The second ring portion extends along a vertical direction and a second direction; the second direction is a direction from the central axis of the pole body toward the edge of the pole body;

[0018] The first ring portion extends into the gap portion and is fixedly connected to the body; the third ring portion is fixedly connected to the cover plate.

[0019] Optionally, the second end face of the first ring portion is provided with a plurality of slots, and the first end face of the main body is provided with connecting feet matching the slots, and the connecting feet are embedded in the slots to fix the plastic ring to the connecting ring; wherein the bottom radius of the slot is larger than the opening radius of the slot.

[0020] Optionally, it also includes a plastic plate arranged below the cover plate, the cover plate is provided with a plurality of grooves on one end face close to the plastic plate, the cover plate is provided with a plurality of plastic columns, and the plastic columns are embedded in the grooves to fix the plastic plate and the cover plate.

[0021] Optionally, the connecting ring is an aluminum ring.

[0022] Optionally, the cover plate is provided with an explosion-proof valve hole, an explosion-proof valve is sealingly disposed in the explosion-proof valve hole, and the explosion-proof valve includes a convex layer and reinforcing ribs disposed around the convex layer.

[0023] Optionally, the thickness of the connecting ring is greater than the thickness of the gap portion.

[0024] Compared with the prior art, the present invention has the following beneficial effects: during installation, the sealing ring and the connecting ring are sequentially sleeved on the pole body, and then the plastic ring is fixedly connected to the pole body; the connecting ring generates a force in the direction of the limiting portion to compress the sealing ring, so that the sealing ring reaches a predetermined compression amount, thereby ensuring the airtightness of the pole assembly; then the connecting ring is fixedly connected to the pole hole to complete the installation of the pole assembly; there is no need to compress the sealing ring through a pressing arm device, which reduces the process steps, while ensuring the airtightness of the overall structure and improving the product qualification rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0026] The structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with this technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportion or adjustment of size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed by the present invention.

[0027] Figure 1 It is a schematic diagram of the exploded structure of the power battery top cover structure;

[0028] Figure 2 This is a schematic diagram of the exploded structure of the pole assembly of the power battery top cover structure;

[0029] Figure 3 The second schematic diagram of the exploded structure of the pole assembly of the power battery top cover structure;

[0030] Figure 4 It is a schematic diagram of the cross-sectional structure of the power battery top cover structure;

[0031] Figure 5 It is a schematic diagram of the cross-sectional structure of the pole assembly of the power battery top cover structure.

[0032] Illustrations: cover plate 1, pole assembly 2, pole hole 11, pole body 21, sealing ring 22, plastic ring 23, conductive part 211, limiting part 212, fixing groove 213, connecting ring 24, body 232, connecting part 233, first ring part 241, second ring part 242, third ring part 243, slot 244, connecting foot 231, plastic plate 3, explosion-proof valve 4, mounting groove 111. DETAILED DESCRIPTION

[0033] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] In the description of the present invention, it should be understood that the terms "upper", "lower", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. It should be noted that when a component is considered to be "connected" to another component, it may be directly connected to the other component or there may be a centrally arranged component at the same time.

[0035] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0036] See also Figures 1 to 5 Explanation: Among them, Figure 1 It is a schematic diagram of the overall structural decomposition of the power battery top cover structure; Figure 2 This is a schematic diagram of the tilt of the pole assembly from a top-down perspective. Figure 3 It is a tilted schematic diagram of the pole assembly from an upward perspective.

[0037] The present invention provides a power battery top cover structure, comprising a cover plate 1 and a pole assembly 2, wherein the cover plate 1 is provided with a pole hole 11, the pole assembly 2 is fixedly connected to the cover plate 1 through the pole hole 11, and the pole assembly 2 comprises a pole body 21;

[0038] The pole body 21 includes a conductive portion 211 and a limiting portion 212 disposed around a first end of the conductive portion 211; the second end of the conductive portion 211 passes through the pole hole 11 and is fixedly connected with a plastic ring 23, and the plastic ring 23 is disposed around the second end of the conductive portion 211;

[0039] The conductive part 211 is also sleeved with an elastic sealing ring 22, and the sealing ring 22 and a connecting ring 24 for pressing the sealing ring 22 toward the limiting part 212 are sequentially arranged between the plastic ring 23 and the limiting part 212;

[0040] The pole hole 11 includes a mounting groove 111 and a mounting through hole penetrating the cover plate 1 from the groove bottom of the mounting groove 111 ; the first end surface of the connecting ring 24 is fixedly connected to the groove bottom of the mounting groove 111 .

[0041] The principle of the present invention is as follows: during installation, the sealing ring 22 and the connecting ring 24 are sequentially sleeved on the pole body 21, and then the plastic ring 23 is fixedly connected to the pole body 21; the connecting ring 24 generates a force in the direction of the limiting portion 212 to compress the sealing ring, so that the sealing ring reaches a predetermined compression amount, thereby ensuring the airtightness of the pole assembly 2; compared with the prior art, there is no need to compress the sealing ring by a pressing arm device during installation, thereby avoiding poor welding; the pole assembly 2 has good airtightness, and then the connecting ring 24 is fixedly connected to the pole hole 11 to complete the installation of the pole assembly 2; the process steps are reduced, while ensuring the airtightness of the overall structure, and improving the qualified rate of the product.

[0042] It should be understood that the purpose of setting the sealing ring 22 is to meet the airtightness requirements of the power battery top cover. To meet the above requirements, the effective compression amount of the sealing ring 22 needs to reach a certain range, among which the preferred effective compression amount is 30%; in this solution, the sealing ring 22 is pressed tightly by the action of the plastic ring 23 and the limiting portion 212, and then the sealing ring 22 is compressed by the connecting ring 24, so that the compression amount of the sealing ring 22 reaches a predetermined effective value, thereby ensuring the sealing of the top cover.

[0043] Specifically, the plastic ring 23 includes a body 232 and a connecting portion 233 protruding from the body 232, and the connecting portion 233 extends in a vertical direction and a first direction; the first direction is a direction from the edge of the pole body 21 toward the central axis of the pole body 21;

[0044] A gap is formed between the body 232 and the sealing ring 22 , and the connecting ring 24 is embedded in the gap and fixedly connected to the body 232 .

[0045] Furthermore, a fixing groove 213 for mounting the plastic ring 23 is disposed at the second end of the conductive portion 211 , and the connecting portion 233 is embedded in the fixing groove 213 and fixedly connected to the conductive portion 211 .

[0046] In this embodiment, the first end face of the sealing ring 22 abuts against the conductive portion 211, and the second end face of the sealing ring 22 abuts against the connecting portion 233. The connecting portion 233 further limits the sealing ring 22 to prevent relative displacement between the sealing ring 22 and the pole body 21.

[0047] In this embodiment, the connecting ring 24 includes a first ring portion 241, a second ring portion 242 and a third ring portion 243, wherein the first ring portion 241 is connected to the upper end of the second ring portion 242, and the third ring portion 243 is connected to the lower end of the second ring portion 242;

[0048] The second ring portion (242) extends along a vertical direction and a second direction; the second direction is a direction from the central axis of the pole body 21 toward the edge of the pole body 21;

[0049] One end of the first ring portion 241 extends into the gap portion and is fixedly connected to the body 232; the third ring portion 243 is fixedly connected to the cover plate 1. A bent connecting ring 24 is provided to weld the third ring portion 243 to the cover plate 1. There is a certain space margin between the third ring portion 243 and the pole body 21, which is convenient for welding and avoids deviation.

[0050] In this embodiment, the second end surface of the first ring portion 241 is provided with a plurality of slots 244, and the first end surface of the body 232 is provided with connecting pins 231 matching the slots 244, and the connecting pins 231 are embedded and installed in the slots 244, so that the plastic ring 23 is fixedly connected to the connecting ring 24; wherein the groove bottom radius of the slot 244 is greater than the opening radius of the slot 244. The slot 244 is a conical cylindrical slot, which prevents the connecting pin 231 from falling off after injection molding, thereby improving the stability of the structure.

[0051] In this embodiment, a plastic plate 3 is further included and arranged below the cover plate 1. A plurality of grooves are arranged on one end surface of the cover plate 1 close to the plastic plate 3. A plurality of plastic columns are arranged on the cover plate 1 and embedded in the grooves so that the plastic plate 3 is fixedly connected to the cover plate 1.

[0052] Optionally, the connecting ring 24 should be made of a metal material suitable for welding. As a preferred solution, the connecting ring 24 is an aluminum ring, which has excellent welding performance and is low in price.

[0053] In this embodiment, the cover plate sheet 1 is provided with an explosion-proof valve hole, in which an explosion-proof valve 4 is sealingly disposed, and the explosion-proof valve 4 includes a convex layer and reinforcing ribs disposed around the convex layer.

[0054] In this embodiment, the thickness of the connecting ring 24 is greater than the thickness of the gap portion, wherein the gap portion is equal to the distance between the lower end surface of the body 232 and the top surface of the uncompressed sealing ring 22. During installation, when the inner ring of the connecting ring 24 extends into the gap portion, since the thickness of the connecting ring 24 is greater than the thickness of the gap portion, the connecting ring will generate a downward pressing force on the sealing ring 22, compressing the sealing ring, thereby ensuring the airtightness of the pole assembly 2.

[0055] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power battery top cover structure, comprising a cover plate (1) and a pole assembly (2), wherein the cover plate (1) is provided with a pole hole (11), and the pole assembly (2) is fixedly connected to the cover plate (1) through the pole hole (11), characterized in that: The pole assembly (2) comprises a pole body (21); The pole body (21) comprises a conductive portion (211) and a limiting portion (212) arranged around a first end of the conductive portion (211); the second end of the conductive portion (211) passes through the pole hole (11) and is fixedly connected to a plastic ring (23); the plastic ring (23) is arranged around the second end of the conductive portion (211); An elastic sealing ring (22) is also sleeved on the conductive part (211), and the sealing ring (22) and a connecting ring (24) for pressing the sealing ring (22) toward the limiting part (212) are sequentially arranged between the plastic ring (23) and the limiting part (212); The pole hole (11) comprises a mounting groove (111) and a mounting through hole extending from the groove bottom of the mounting groove (111) through the cover plate (1); the first end surface of the connecting ring (24) is fixedly connected to the groove bottom of the mounting groove (111); The plastic ring (23) comprises a body (232) and a connecting portion (233) protruding from the body (232), wherein the connecting portion (233) extends in a vertical direction and a first direction; the first direction is a direction from the edge of the pole body (21) toward the central axis of the pole body (21); A gap portion is formed between the body (232) and the sealing ring (22), and the connecting ring (24) is embedded and installed in the gap portion and fixedly connected to the body (232); The connecting ring (24) comprises a first ring portion (241), a second ring portion (242) and a third ring portion (243); the first ring portion (241) is connected to the upper end of the second ring portion (242), and the third ring portion (243) is connected to the lower end of the second ring portion (242); The second ring portion (242) extends along a vertical direction and a second direction; the second direction is a direction from the central axis of the pole body (21) toward the edge of the pole body (21); The first ring portion (241) extends into the gap portion and is fixedly connected to the body (232); the third ring portion (243) is fixedly connected to the cover plate (1); The thickness of the connecting ring (24) is greater than the thickness of the gap portion.

2. The power battery top cover structure according to claim 1, characterized in that: The second end of the conductive part (211) is provided with a fixing groove (213) for mounting the plastic ring (23), and the connecting part (233) is embedded in the fixing groove (213) and fixedly connected to the conductive part (211).

3. The power battery top cover structure according to claim 2, characterized in that: The first end surface of the sealing ring (22) abuts against the conductive portion (211), and the second end surface of the sealing ring (22) abuts against the connecting portion (233).

4. The power battery top cover structure according to claim 1, characterized in that: The second end face of the first ring portion (241) is provided with a plurality of slots (244), the first end face of the body (232) is provided with connecting feet (231) matching the slots (244), and the connecting feet (231) are embedded and installed in the slots (244) so ​​that the plastic ring (23) and the connecting ring (24) are fixedly connected; wherein the groove bottom radius of the slot (244) is greater than the opening radius of the slot (244).

5. The power battery top cover structure according to claim 1, characterized in that: It also includes a plastic plate (3) arranged below the cover plate (1); a plurality of grooves are arranged on one end face of the cover plate (1) close to the plastic plate (3); a plurality of plastic columns are arranged on the cover plate (1); the plastic columns are embedded in the grooves so that the plastic plate (3) is fixedly connected to the cover plate (1).

6. The power battery top cover structure according to claim 1, characterized in that: The connecting ring (24) is an aluminum ring.

7. The power battery top cover structure according to claim 1, characterized in that: The cover plate (1) is provided with an explosion-proof valve hole, in which an explosion-proof valve (4) is sealed, and the explosion-proof valve (4) comprises a convex layer and reinforcing ribs arranged around the convex layer.

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