阅读说明：本技术 一种动力电池顶盖结构 (Power battery top cover structure ) 是由 李新宏 钟军 陈洪亮 邓银桥 陈圣 周斌 于 2021-03-16 设计创作，主要内容包括：本发明公开了一种动力电池顶盖结构,包括盖板片和极柱组件,盖板片上开设有极柱孔,极柱组件通过极柱孔与盖板片固定连接,极柱组件包括极柱体；极柱体包括导电部和限位部；导电部的第二端部固定连接有塑胶环；导电部上还套设密封圈,塑胶环和限位部之间依次设置密封圈和用于朝限位部方向压紧密封圈的连接环；极柱孔包括安装槽；连接环的第一端面与安装槽的槽底固定连接。连接环会产生一个朝限位部方向的作用力来压紧密封圈,使密封圈达到预定的压缩量,从而保证极柱组件的气密性；再将连接环固定连接于极柱孔内,完成极柱组件的安装；无需通过压臂设备来压缩密封圈,减少了工艺步骤,同时保证了整体结构的气密性,提高了产品的合格率。(The invention discloses a top cover structure of a power battery, which comprises a cover plate sheet and a pole post assembly, wherein the cover plate sheet is provided with a pole post hole, the pole post assembly is fixedly connected with the cover plate sheet through the pole post hole, and the pole post assembly comprises a pole post body; the pole body comprises a conductive part and a limiting part; the second end part of the conductive part is fixedly connected with a plastic ring; a sealing ring is sleeved on the conductive part, and the sealing ring and a connecting ring for pressing the sealing ring towards the limiting part are sequentially arranged between the plastic ring and the limiting part; the pole hole comprises an installation groove; the first end surface of the connecting ring is fixedly connected with the bottom of the mounting groove. The connecting ring can generate an acting force towards the limiting part to compress the sealing ring, so that the sealing ring reaches a preset compression amount, and the air tightness of the pole post assembly is ensured; then fixedly connecting the connecting ring in the pole hole to complete the installation of the pole assembly; the sealing ring is not required to be compressed by arm pressing equipment, so that the process steps are reduced, the air tightness of the whole structure is ensured, and the qualification rate of products is improved.)

1. A power battery top cover structure comprises a cover plate sheet (1) and a pole post assembly (2), wherein a pole post hole (11) is formed in the cover plate sheet (1), and the pole post assembly (2) is fixedly connected with the cover plate sheet (1) through the pole post hole (11), and is characterized in that the pole post assembly (2) comprises a pole post body (21);

the pole column body (21) comprises a conductive part (211) and a limiting part (212) arranged around a first end part of the conductive part (211); the second end of the conductive part (211) penetrates through the pole column hole (11) and is fixedly connected with a plastic ring (23), and the plastic ring (23) is arranged around the second end of the conductive part (211);

an elastic sealing ring (22) is further sleeved on the conductive part (211), and the sealing ring (22) and a connecting ring (24) for pressing the sealing ring (22) towards the direction of the limiting part (212) are sequentially arranged between the plastic ring (23) and the limiting part (212);

the pole column hole (11) comprises a mounting groove (111) and a mounting through hole which penetrates through the cover plate piece (1) from the bottom of the mounting groove (111); the first end surface of the connecting ring (24) is fixedly connected with the groove bottom of the mounting groove (111).

2. The top cover structure of the power battery as claimed in claim 1, wherein the plastic ring (23) comprises a body (232) and a connecting part (233) protruding from the body (232), the connecting part (233) extending along a vertical direction and a first direction; the first direction is from the edge of the pole cylinder (21) to the central axis of the pole cylinder (21);

a gap part is formed between the body (232) and the sealing ring (22), and the connecting ring (24) is embedded in the gap part and fixedly connected with the body (232).

3. The top cover structure of the power battery as claimed in claim 2, wherein 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 with the conductive part (211).

4. The power battery top cover structure according to claim 3, wherein a first end surface of the sealing ring (22) abuts against the conductive portion (211), and a second end surface of the sealing ring (22) abuts against the connecting portion (233).

5. The power battery top cover structure according to claim 2, wherein the connecting ring (24) comprises a first ring part (241), a second ring part (242) and a third ring part (243), the first ring part (241) is connected with the upper end of the second ring part (242), and the third ring part (243) is connected with the lower end of the second ring part (242);

the second loop portion (242) extends in a vertical direction and a second direction; the second direction is a direction from the central axis of the pole cylinder (21) to the edge of the pole cylinder (21);

the first ring part (241) extends into the gap part and is fixedly connected with the body (232); the third ring part (243) is fixedly connected with the cover plate sheet (1).

6. The top cover structure of the power battery is characterized in that a plurality of clamping grooves (244) are formed in the second end surface of the first ring part (241), connecting pins (231) matched with the clamping grooves (244) are formed in the first end surface of the body (232), and the connecting pins (231) are embedded in the clamping grooves (244), so that the plastic ring (23) is fixedly connected with the connecting ring (24); wherein a groove bottom radius of the clamping groove (244) is larger than an opening radius of the clamping groove (244).

7. The top cover structure of the power battery according to claim 1, further comprising a plastic plate (3) disposed below the cover plate (1), wherein a plurality of grooves are disposed on one end surface of the cover plate (1) close to the plastic plate (3), and a plurality of plastic columns are disposed on the cover plate (1), and are embedded in the grooves, so that the plastic plate (3) is fixedly connected with the cover plate (1).

8. The power cell top cap structure of claim 1, wherein the connection ring (24) is an aluminum ring.

9. The top cover structure of the power battery according to claim 1, wherein the cover plate (1) is provided with an explosion-proof valve hole, an explosion-proof valve (4) is hermetically arranged in the explosion-proof valve hole, and the explosion-proof valve (4) comprises a raised layer and a reinforcing rib arranged around the raised layer.

10. The power cell top cap structure according to claim 2, wherein the thickness of the connection ring (24) is greater than the thickness of the gap portion.

Technical Field

The invention relates to the technical field of power batteries, in particular to a top cover structure of a power battery.

Background

With the increasing development of new energy industry, the research and development of a power battery as a key component of the new energy industry are also more and more widely concerned; the power battery has the advantages of light weight, high capacity, long service life, low self-discharge rate, no memory effect, no pollution and the like, and particularly, the power battery is widely applied to equipment such as electric bicycles, electric hardware tools and the like, and the application of the power battery in the equipment has advantages.

In the prior art, a power battery cover plate adopts the steps that after an electrode post assembly is processed and molded, an assembled sealing ring is welded on the cover plate, and welding equipment acts on the surface of an electrode post through a pressing arm to enable the electrode post to compress the sealing ring and then carries out welding; the process can cause insufficient compression amount of the sealing ring, air leakage is caused, and the qualification rate of products is reduced.

In view of this, need to improve the power battery apron among the prior art to solve when compressing the sealing washer through the pressure arm effect, easily lead to the sealing washer compressive capacity not enough, cause the technical problem of gas leakage.

Disclosure of Invention

The invention aims to provide a top cover structure of a power battery, which solves the technical problems.

In order to achieve the purpose, the invention adopts the following technical scheme:

a top cover structure of a power battery comprises a cover plate sheet and a pole post assembly, wherein a pole post hole is formed in the cover plate sheet, the pole post assembly is fixedly connected with the cover plate sheet through the pole post hole, and the pole post assembly comprises a pole post body;

the pole body comprises a conductive part and a limiting part arranged around the first end part of the conductive part; the second end part of the conductive part penetrates out of the pole column hole and is fixedly connected with a plastic ring, and the plastic ring is arranged around the second end part of the conductive part;

an elastic sealing ring is further sleeved on the conductive part, and the sealing ring and a connecting ring used for pressing the sealing ring towards the direction of the limiting part are sequentially arranged between the plastic ring and the limiting part;

the pole column hole comprises a mounting groove and a mounting through hole which penetrates through the cover plate sheet from the bottom of the mounting groove;

the first end surface of the connecting ring is fixedly connected with the bottom of the mounting groove.

Optionally, the plastic ring includes a body and a connecting portion protruding from the body, and the connecting portion extends in a vertical direction and a first direction; the first direction is from the edge of the pole column body to the central axis of the pole column body;

a gap part is formed between the body and the sealing ring, and the connecting ring is embedded in the gap part and is fixedly connected with the body.

Optionally, a fixing groove for mounting the plastic ring is formed at the second end of the conductive portion, and the connecting portion is mounted in the fixing groove in an embedded manner and is fixedly connected to the conductive portion.

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.

Optionally, the connecting ring includes a first ring portion, a second ring portion and a third ring portion, the first ring portion is connected with the upper end of the second ring portion, and the third ring portion is connected with the lower end of the second ring portion;

the second ring portion extends in a vertical direction and a second direction; the second direction is from the central axis of the pole column body to the edge of the pole column body;

the first ring part extends into the gap part and is fixedly connected with the body; the third ring part is fixedly connected with the cover plate.

Optionally, the second end surface of the first ring portion is provided with a plurality of clamping grooves, the first end surface of the body is provided with connecting pins matched with the clamping grooves, and the connecting pins are embedded in the clamping grooves, so that the plastic ring is fixedly connected with the connecting ring; the radius of the groove bottom of the clamping groove is larger than the radius of the opening of the clamping groove.

Optionally, still including set up in the plastic board of apron piece below, the apron piece is close to a terminal surface of plastic board is provided with a plurality of cell body, be provided with a plurality of plastic column on the apron piece, plastic column install with imbedding in the cell body, so that the plastic board with apron piece fixed connection.

Optionally, the connection ring is an aluminum ring.

Optionally, the cover plate piece is provided with an explosion-proof valve hole, an explosion-proof valve is hermetically arranged in the explosion-proof valve hole, and the explosion-proof valve comprises a protruding layer and a reinforcing rib surrounding the protruding layer.

Optionally, the thickness of the connection ring is greater than the thickness of the gap portion.

Compared with the prior art, the invention has the following beneficial effects: when the plastic ring is installed, the sealing ring and the connecting ring are sequentially sleeved on the pole column body, and then the plastic ring is fixedly connected on the pole column body; the connecting ring can generate an acting force towards the limiting part to compress the sealing ring, so that the sealing ring reaches a preset compression amount, and the air tightness of the pole post assembly is ensured; then fixedly connecting the connecting ring in the pole hole to complete the installation of the pole assembly; the sealing ring is not required to be compressed by arm pressing equipment, so that the process steps are reduced, the air tightness of the whole structure is ensured, and the qualification rate of products is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

The structure, proportion, size and the like shown in the drawings are only used for matching with the content disclosed in the specification, so that the person skilled in the art can understand and read the description, and the description is not used for limiting the limit condition of the implementation of the invention, so the method has no technical essence, and any structural modification, proportion relation change or size adjustment still falls within the scope of the technical content disclosed by the invention without affecting the effect and the achievable purpose of the invention.

FIG. 1 is a schematic exploded view of a top cover structure of a power battery;

FIG. 2 is one of the exploded schematic structural views of a pole assembly of a power battery top cover structure;

fig. 3 is a second exploded view of the pole assembly of the top cover structure of the power battery;

FIG. 4 is a schematic cross-sectional view of a top cover structure of a power battery;

fig. 5 is a schematic cross-sectional view of a pole assembly of a power battery top cover structure.

Illustration of the drawings: the cover plate piece 1, the pole assembly 2, the pole hole 11, the pole body 21, the sealing ring 22, the plastic ring 23, the conductive portion 211, the limiting portion 212, the fixing groove 213, the connecting ring 24, the body 232, the connecting portion 233, the first ring portion 241, the second ring portion 242, the third ring portion 243, the clamping groove 244, the connecting pin 231, the plastic plate 3, the explosion-proof valve 4 and the mounting groove 111.

Detailed Description

In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. It should be noted that when one component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present.

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

The description is made with reference to fig. 1 to 5: wherein, fig. 1 is an exploded view of the overall structure of the top cover structure of the power battery; fig. 2 is an oblique view of the pole assembly from a top view, and fig. 3 is an oblique view of the pole assembly from a bottom view.

The invention provides a top cover structure of a power battery, which comprises a cover plate sheet 1 and a pole post component 2, wherein a pole post hole 11 is formed in the cover plate sheet 1, the pole post component 2 is fixedly connected with the cover plate sheet 1 through the pole post hole 11, and the pole post component 2 comprises a pole post body 21;

the pole column 21 includes a conductive portion 211 and a position-limiting portion 212 surrounding a first end portion of the conductive portion 211; the second end of the conductive part 211 penetrates through the pole hole 11, and is fixedly connected with a plastic ring 23, and the plastic ring 23 is arranged around the second end of the conductive part 211;

an elastic sealing ring 22 is further sleeved on the conductive part 211, and the sealing ring 22 and a connecting ring 24 for pressing the sealing ring 22 towards the direction of the limiting part 212 are sequentially arranged between the plastic ring 23 and the limiting part 212;

the pole column hole 11 comprises a mounting groove 111 and a mounting through hole penetrating through the cover plate piece 1 from the bottom of the mounting groove 111; the first end surface of the connection ring 24 is fixedly connected with the groove bottom of the installation groove 111.

The principle of the invention is as follows: during installation, the sealing ring 22 and the connecting ring 24 are sequentially sleeved on the pole column 21, and then the plastic ring 23 is fixedly connected to the pole column 21; the connecting ring 24 will generate an acting force towards the limiting part 212 to press the sealing ring, so that the sealing ring reaches a predetermined compression amount, thereby ensuring the air tightness of the pole assembly 2; compared with the prior art, the sealing ring is not required to be compressed by arm pressing equipment during installation, and the condition of poor welding is avoided; the air tightness of the pole assembly 2 is good, and then the connecting ring 24 is fixedly connected in the pole hole 11 to complete the installation of the pole assembly 2; the process steps are reduced, the air tightness of the whole structure is ensured, and the product percent of pass is improved.

It is to be understood that the sealing ring 22 is provided for meeting the requirement of the top cover air tightness of the power battery, and in order to meet the requirement, the effective compression amount of the sealing ring 22 needs to reach a certain range, wherein the preferable effective compression amount is 30%; in the scheme, the plastic ring 23 and the limiting part 212 are used for tightly abutting against the sealing ring 22, and then the connecting ring 24 is used for compressing the sealing ring 22, so that the compression amount of the sealing ring 22 reaches a preset effective value, and the sealing performance of the top cover is ensured.

Specifically, the plastic ring 23 includes 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 cylinder 21 to the central axis of the pole cylinder 21;

a gap portion is formed between the body 232 and the sealing ring 22, and the connecting ring 24 is inserted into the gap portion and is fixedly connected with the body 232.

Further, the second end of the conductive portion 211 is provided with a fixing groove 213 for mounting the plastic ring 23, and the connection portion 233 is embedded in the fixing groove 213 and fixedly connected to the conductive portion 211.

In the present embodiment, a first end surface of the seal ring 22 is in contact with the conductive portion 211, and a second end surface of the seal ring 22 is in contact with the connection portion 233. The connecting portion 233 serves to further limit the position of the sealing ring 22, so as to prevent the sealing ring 22 and the pole column 21 from moving relative to each other.

In the present embodiment, the connection ring 24 includes a first ring portion 241, a second ring portion 242, and a third ring portion 243, the first ring portion 241 is connected to an upper end of the second ring portion 242, and the third ring portion 243 is connected to a lower end of the second ring portion 242;

the second loop portion (242) extends in a vertical direction and a second direction; the second direction is a direction from the central axis of the pole cylinder 21 to the edge of the pole cylinder 21;

one end of the first ring part 241 extends into the gap part and is fixedly connected with the body 232; the third ring portion 243 is fixedly connected to the cover plate 1. The connecting ring 24 is bent, the third ring portion 243 is welded with the cover plate piece 1, and a certain space margin is formed between the third ring portion 243 and the pole body 21, so that welding is facilitated, and deviation is avoided.

In this embodiment, the second end surface of the first ring portion 241 is provided with a plurality of engaging slots 244, the first end surface of the body 232 is provided with connecting pins 231 matched with the engaging slots 244, and the connecting pins 231 are embedded in the engaging slots 244, so that the plastic ring 23 is fixedly connected to the connecting ring 24; wherein a radius of a bottom of the slot 244 is larger than a radius of an opening of the slot 244. The clamping groove 244 is a tapered cylinder groove, so that the connecting pin 231 is prevented from falling off after injection molding, and the stability of the structure is improved.

In this embodiment, still including set up in the plastic board 3 of apron piece 1 below, apron piece 1 is close to a terminal surface of plastic board 3 is provided with a plurality of cell body, be provided with a plurality of plastic post on the apron piece 1, the plastic post install with imbedding in the cell body, so that plastic board 3 with apron piece 1 fixed connection.

Optionally, the connection ring 24 should be made of a metal material suitable for welding, wherein as a preferable scheme, the connection ring 24 is an aluminum ring, and the aluminum ring has excellent welding performance and low price.

In this embodiment, the cover plate piece 1 is provided with an explosion-proof valve hole, an explosion-proof valve 4 is hermetically arranged in the explosion-proof valve hole, and the explosion-proof valve 4 comprises a convex layer and a reinforcing rib surrounding the convex layer.

In this embodiment, the thickness of the connection ring 24 is greater than the thickness of the gap portion, which is equal to the distance between the lower end surface of the body 232 and the top surface of the uncompressed sealing ring 22. When the inner ring of the connection ring 24 is inserted into the gap portion during installation, since the thickness of the connection ring 24 is greater than that of the gap portion, the connection ring will generate a downward pressing force to act on the sealing ring 22, so that the sealing ring is compressed, thereby ensuring the air tightness of the pole assembly 2.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.