Sealing structure of battery cover plate

Abstract

The utility model discloses a sealing structure of a battery cover plate, which comprises a cover plate and a sealing assembly, the sealing assembly comprises a protective cover base, a first sealing element, a protective cover upper shell, a second sealing element and a connector protective cover, the protective cover base is fixed on the cover plate, the first sealing element is arranged in the protective cover base, and the second sealing element is arranged in the connector protective cover. A connecting circuit board of the battery chip penetrates into the protective cover base and is limited on the first sealing piece, and the lower end face of the connecting circuit board is attached to the first sealing piece; the protective cover upper shell is installed in the protective cover base, the second sealing piece is arranged in the protective cover base and attached to the upper end face of the connecting circuit board, and the connector protective cover is installed in the protective cover upper shell. According to the utility model, the electrolyte leakage is prevented, and the chip output connector can be protected at the same time.

Description

Technical Field

[0001] This utility model belongs to the field of battery sealing technology, specifically relating to a sealing structure for a battery cover plate used to seal the external communication interface of an internal battery chip. Background Technology

[0002] Thermal runaway and range anxiety remain significant factors for consumers when choosing a power battery. Current technology uses a Battery Management System (BMS) to collect external signals and employs algorithms to estimate battery status. This data is then used in conjunction with electronic control and thermal management systems to prevent thermal runaway. Beyond upgrading traditional algorithm models, accurate data acquisition can significantly improve the accuracy of range monitoring. Battery status estimation directly impacts the driving experience. Understanding battery status and ensuring optimal battery operation leads to improved estimation accuracy, which in turn optimizes the overall performance of the battery management system.

[0003] Currently, most battery management systems use indirect data acquisition methods outside the battery. To improve acquisition accuracy and obtain more battery status information, sensors monitoring battery information are placed inside the battery to enhance monitoring accuracy and avoid signal loss. However, transmitting the acquired signal requires openings in the battery casing. Therefore, to prevent electrolyte leakage, a sealing structure needs to be designed to prevent electrolyte leakage and protect the chip output connector. Utility Model Content

[0004] The main objective of this invention is to provide a sealing structure for a battery cover, thereby overcoming the shortcomings of the prior art.

[0005] To achieve the aforementioned objective, the technical solution adopted by this utility model includes: a sealing structure for a battery cover, comprising:

[0006] cover plate,

[0007] A sealing assembly includes a protective cover base, a first seal, a protective cover upper shell, a second seal, and a connector protective cover. The protective cover base is fixed to a cover plate. The first seal is built into the protective cover base. The battery chip's connection circuit board passes through the protective cover base and is confined to the first seal, with its lower end face abutting against the first seal. The protective cover upper shell is installed in the protective cover base. The second seal is built into the protective cover base and abuts against the upper end face of the connection circuit board. The connector protective cover is installed in the protective cover upper shell.

[0008] In a preferred embodiment, the cover plate is provided with a first fixing groove, and the protective cover base is provided with a fixing protrusion. The cover plate is installed in the first fixing groove of the protective cover base through the fixing protrusion and is welded and fixed to the protective cover base.

[0009] In a preferred embodiment, the protective cover base is provided with a through hole, a limiting groove and a first sealing groove. The connecting circuit board passes through the through hole into the protective cover base and is limited within the limiting groove. The first sealing element is embedded in the first sealing groove.

[0010] In a preferred embodiment, the protective cover has a second sealing groove and a second fixing groove inside its upper shell, the second sealing element is embedded in the second sealing groove, and the connector protective cover is installed in the second fixing groove.

[0011] In a preferred embodiment, the upper shell of the protective cover presses the second seal and the first seal in the protective cover base toward the cover plate direction until its top is flush with the top of the protective cover base, and is fixed to the protective cover base by welding.

[0012] In a preferred embodiment, the first seal and the second seal have the same compression amount.

[0013] In a preferred embodiment, the compression of the first seal and the second seal is between 20% and 30%.

[0014] In a preferred embodiment, both the first and second seals are sealing rings.

[0015] In a preferred embodiment, the contact surface between the first seal and the connecting circuit board is larger than the contact surface between the second seal and the connecting circuit board.

[0016] In a preferred embodiment, the connecting circuit board is a flexible circuit board.

[0017] Compared with the prior art, the beneficial effects of this utility model are at least as follows:

[0018] This invention provides a novel battery cover sealing structure. By sealing the external communication interface of the battery chip (used to connect to the BMS and other processing chips) within the sealing structure, electrolyte leakage is prevented while the chip output connector is protected. This solves the sealing problem of existing battery status acquisition chips that are built-in and require an external communication interface to be brought out on the battery cover. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a three-dimensional view of the sealing structure of a battery cover provided by this utility model;

[0021] Figure 2 yes Figure 1 Exploded view;

[0022] Figure 3 yes Figure 2 A three-dimensional structural diagram of the base of the protective cover;

[0023] Figure 4 This is a cross-sectional view of the sealing structure of a battery cover according to this utility model;

[0024] Figure label:

[0025] 1. Cover plate; 11. First fixing groove; 2. Sealing assembly; 21. Protective cover base; 211. Fixing protrusion; 212. Through hole; 213. Limiting groove; 214. First sealing groove; 22. First sealing element; 23. Protective cover upper shell; 231. Second sealing groove; 232. Second fixing groove; 24. Second sealing element; 25. Connector protective cover; 3. Connecting circuit board. Detailed Implementation

[0026] The present invention will be more fully understood through the following detailed description, which should be read in conjunction with the accompanying drawings. Detailed embodiments of the present invention are disclosed herein; however, it should be understood that the disclosed embodiments are merely exemplary and that the present invention may be embodied in various forms. Therefore, the specific functional details disclosed herein should not be construed as limiting, but rather as the basis for the claims and as a representative basis for teaching those skilled in the art to employ the present invention in different ways in any suitable detailed embodiment.

[0027] like Figures 1-4 As shown, the present invention discloses a sealing structure for a battery cover plate, which belongs to the field of battery sealing technology. It mainly includes a cover plate 1 and a sealing component 2. The sealing component 2 is fixed on the cover plate 1 and is used to seal and protect the external communication interface of the battery chip.

[0028] The cover plate 1 is provided with a through first fixing groove 11. In this embodiment, the first fixing groove 11 is an oblong groove that passes through the cover plate 1.

[0029] The sealing assembly 2 consists of multiple sub-parts, including a protective cover base 21, a first seal 22, a protective cover upper shell 23, a second seal 24, and a connector protective cover 25. The protective cover base 22 is fixed to the cover plate 1. In this embodiment, the bottom of the protective cover base 21 is provided with a downwardly extending fixing protrusion 211. The fixing protrusion 211 is assembled into the first fixing groove 11 of the cover plate 1, and the protective cover base 21 and the cover plate 1 are fixed on the back (i.e., the bottom surface) of the cover plate 1 by laser welding.

[0030] Combination Figure 3 As shown, the protective cover base 21 is specifically provided with a through hole 212, a limiting groove 213, and a first sealing groove 214. The through hole 212 allows the battery chip's connecting circuit board 3 to pass through the protective cover base 21. In this embodiment, the through hole 212 is located on and extends vertically through the fixing protrusion 211 of the protective cover base 21. The limiting groove 213 is located inside the protective cover base 21. The connecting circuit board 3, passing through the through hole 212, is engaged and limited within the limiting groove 213. In this embodiment, the limiting groove 213 is an annular groove, and the connecting circuit board 3 is a flexible circuit board. The first sealing groove 214 is located inside the protective cover base 21 and is used to install a first sealing element 22. In this embodiment, the first sealing groove 214 is located below the limiting groove 213 and is also an annular groove. The first sealing element 22 is embedded within the first sealing groove 214. In other words, the battery chip connection circuit board 3 passes through the through hole 212 into the protective cover base 21 and is confined on the first sealing member 22, and its lower end face is in contact with the first sealing member 22. The first sealing member 22 can deform when it is in contact with the connection circuit board 3.

[0031] The protective cover upper shell 23 is specifically provided with a second sealing groove 231 and a second fixing groove 232. The second sealing element 24 is embedded in the second sealing groove 231. In this embodiment, both the second sealing groove 231 and the second fixing groove 232 are annular grooves, and are respectively provided on the outer and inner sides of the protective cover upper shell 23; that is, the second sealing groove 231 is located on the outer ring, and the second fixing groove 232 is located on the inner ring. The connector protective cover 25 is installed in the second fixing groove 232 to prevent direct contact between the external connector (not shown) and the metal shell inside the cover plate. It is generally located around the exposed portion of the chip's external communication interface.

[0032] The upper cover 23 is installed inside the base 21 of the protective cover and is used to seal the connecting circuit board 3 within the sealing assembly 2 in conjunction with the base 21. After the upper cover 23 is installed inside the base 21, the second sealing member 22 is in contact with the upper surface of the connecting circuit board 3, that is, the connecting circuit board 3 is sealed between the first sealing member 22 and the second sealing member 24. The second sealing member 24 can also deform when it is in contact with the connecting circuit board 3. In addition, after the upper cover 23 is installed inside the base 21, the second sealing member 24 and the first sealing member 22 are pressed towards the cover plate so that its top is flush with the top of the base 21, and then the upper cover 23 is fixed to the base 21 by welding.

[0033] Preferably, the compression amounts of the first seal 21 and the second seal 24 are the same, and more preferably, the compression amounts are set between 20% and 30%. Furthermore, the contact surface between the first seal 21 and the connecting circuit board 3 is preferably larger than the contact surface between the second seal 24 and the connecting circuit board 3. This arrangement achieves a better sealing effect, which is beneficial for production and automated assembly. In practice, both the first seal 21 and the second seal 24 can be sealing rings.

[0034] The battery cover sealing structure provided by this utility model has the following advantages: This utility model provides a novel battery cover sealing structure, which seals the external communication interface of the battery chip (used to connect to the BMS and other processing chips) within the sealing structure, preventing electrolyte leakage while protecting the chip output connector. This solves the sealing problem of existing battery status acquisition chips that are built-in and require an external communication interface to be brought out on the battery cover.

[0035] All aspects, embodiments, features, and examples of this utility model should be considered illustrative in all respects and are not intended to limit the utility model, the scope of which is defined only by the claims. Other embodiments, modifications, and uses will become apparent to those skilled in the art without departing from the spirit and scope of the claimed utility model.

[0036] The use of titles and sections in this utility model does not imply limitation of this utility model; each section can be applied to any aspect, embodiment or feature of this utility model.

Claims

1. A sealing structure for a battery cover, characterized in that: The sealing structure includes: cover plate, A sealing assembly includes a protective cover base, a first seal, a protective cover upper shell, a second seal, and a connector protective cover. The protective cover base is fixed to a cover plate. The first seal is built into the protective cover base. The battery chip's connection circuit board passes through the protective cover base and is confined to the first seal, with its lower end face abutting against the first seal. The protective cover upper shell is installed in the protective cover base. The second seal is built into the protective cover base and abuts against the upper end face of the connection circuit board. The connector protective cover is installed in the protective cover upper shell.

2. The sealing structure of a battery cover according to claim 1, characterized in that: The cover plate is provided with a first fixing groove, and the protective cover base is provided with a fixing protrusion. The cover plate is installed in the first fixing groove of the protective cover base through the fixing protrusion and is welded and fixed to the protective cover base.

3. The sealing structure of a battery cover according to claim 1, characterized in that: The protective cover base is provided with a through hole, a limiting groove and a first sealing groove. The connecting circuit board passes through the through hole into the protective cover base and is limited in the limiting groove. The first sealing element is embedded in the first sealing groove.

4. The sealing structure of a battery cover according to claim 1, characterized in that: The protective cover has a second sealing groove and a second fixing groove inside its shell. The second sealing element is embedded in the second sealing groove, and the connector protective cover is installed in the second fixing groove.

5. The sealing structure of a battery cover according to claim 1, characterized in that: The upper shell of the protective cover presses the second sealing element and the first sealing element towards the cover plate inside the protective cover base until its top is flush with the top of the protective cover base, and is fixed to the protective cover base by welding.

6. The sealing structure of a battery cover according to claim 1, characterized in that: The first seal and the second seal have the same compression.

7. The sealing structure of a battery cover according to claim 6, characterized in that: The compression of the first and second seals is between 20% and 30%.

8. The sealing structure of a battery cover according to claim 6 or 7, characterized in that: Both the first and second seals are sealing rings.

9. A sealing structure for a battery cover according to claim 1, 6, or 7, characterized in that: The contact surface between the first seal and the connecting circuit board is larger than the contact surface between the second seal and the connecting circuit board.

10. The sealing structure of a battery cover according to claim 1, characterized in that: The connecting circuit board is a flexible circuit board.

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