CN213071285U

CN213071285U - Battery safety valve structure and battery thereof

Info

Publication number: CN213071285U
Application number: CN202022062547.8U
Authority: CN
Inventors: 邓江南; 尹振华; 刘晨南; 姜斌; 袁威
Original assignee: Dongguan Tafel New Energy Technology Co Ltd; Jiangsu Tafel New Energy Technology Co Ltd; Jiangsu Tafel Power System Co Ltd
Current assignee: Jiangsu Zenio New Energy Battery Technologies Co Ltd
Priority date: 2020-09-20
Filing date: 2020-09-20
Publication date: 2021-04-27
Anticipated expiration: 2030-09-20

Abstract

The utility model discloses a battery safety valve structure and battery thereof. The battery safety valve structure comprises a thin film structure and a plastic protection film, wherein the thin film structure is formed by scoring a groove on the outer side surface of a metal shell of a battery. The thin film structure includes a thin film, steps and peripheral grooves scribed along edges of the thin film, and intermediate grooves scribed in the thin film. Wherein the thickness of the thin film is not more than half of the thickness of the metal shell. The thickness of the plate body of the step part is larger than that of the film. The thickness of the plate body of the peripheral groove and the middle groove portion is smaller than that of the film. The plastic protective film is arranged outside the film through a step. The plastic protective film is provided with a pressure relief hole. The utility model discloses a battery safety valve structure and casing integration processing form to produced welding slag when having avoided the installation of ordinary relief valve is to the risk that the battery produced, has also avoided simultaneously competing for the problem in battery inner space with battery electricity core, and has reduced the risk of the adjacent battery of electrolyte short circuit after the relief valve explodes.

Description

Battery safety valve structure and battery thereof

Technical Field

The utility model relates to a relief valve or explosion-proof valve of setting on battery.

Background

Currently, lithium ion batteries are widely used in various fields. Since the discharge of the lithium ion battery in use causes an increase in internal temperature, in a severe case, it may even cause explosion of the battery. For this reason, many lithium ion batteries are provided with explosion-proof safety valves. In the prior art, an explosion-proof safety valve of a lithium ion battery is usually arranged on a battery top cover. The safety valve is generally a commercially available part. By opening the battery top cover and then installing the safety valve at the opening. However, these arrangements are limited to the case where the battery post is disposed on the battery top cover. If the battery post is arranged on the end face of the square battery, the safety valve is arranged along with the battery post on the end face, and when the safety valve is exploded, electrolyte in the lithium ion battery flows out. The effluent electrolyte contaminates other adjacent cells and may even cause short circuits in adjacent cells, thereby initiating a chain reaction. Therefore, generally, a safety valve needs to be provided on the top surface of the battery. After the safety valve on the top surface bursts open, electrolyte inside the lithium ion battery is not easy to flow out. However, the arrangement of the battery post at the end face of the square battery means that the inside of the top face of the battery is pressed against the cell of the battery. Whereas the safety valves of outsourced parts usually require an internal space. Thus, the safety valve needs to be arranged to strive for space for the battery cell inside the battery, which reduces the energy density of the battery.

Disclosure of Invention

The utility model discloses the problem that will solve: when the battery post is located on the end face of the square battery, the safety valve is arranged on the top face of the battery, and the safety valve and the battery core are required to strive for the space inside the battery.

In order to solve the above problem, the utility model discloses a scheme as follows:

according to the utility model discloses a battery safety valve structure, which comprises a thin film structure formed by carving a groove on the outer side surface of a metal shell; the thin film structure comprises a thin film; the thickness of the thin film is smaller than that of the metal shell.

Further, the thickness of the thin film is not more than half of the thickness of the metal case.

Furthermore, the safety valve structure of the battery also comprises a plastic protective film; the thin film structure further comprises a step scribed along the edge of the thin film; the thickness of the plate body of the step part is larger than that of the film and smaller than that of the metal shell; the plastic protective film is arranged outside the film through a step.

Further, according to the safety valve structure of the battery of the present invention, the thin film structure further includes a peripheral groove carved along the edge of the thin film; the peripheral groove is positioned on the inner side of the step; the thickness of the plate body of the peripheral groove portion is smaller than that of the film.

Further, according to the safety valve structure of the battery of the present invention, the thin film structure further includes an intermediate groove carved in the thin film; the middle groove is connected with the peripheral groove, so that the film is divided into a plurality of parts by the middle groove; the thickness of the plate body of the intermediate groove portion is smaller than that of the film.

Further, according to the safety valve structure of the present invention, the intermediate groove is symmetrical about the center of the thin film, and has an X-shape, or a Z-shape, or a C-shape, or a Y-shape, or an S-shape, or a star-shape.

Further, according to the utility model discloses a battery safety valve structure, the degree of depth of middle groove and peripheral groove is the same to the thickness of middle groove and peripheral groove part plate body is no longer than the third of metal casing thickness.

According to the utility model, the outer side surface of the metal shell of the battery is engraved with the groove to form a film structure; the thin film structure comprises a thin film and a peripheral groove carved along the edge of the thin film; the thickness of the film is smaller than that of the metal shell; the thickness of the peripheral groove is less than the thickness of the thin film.

Furthermore, according to the battery of the present invention, the thin film structure further comprises an intermediate groove engraved in the thin film; the middle groove is connected with the peripheral groove, so that the film is divided into a plurality of parts by the middle groove; the thickness of the plate body of the intermediate groove portion is smaller than that of the film.

Furthermore, according to the battery of the utility model, steps are engraved along the edges of the film; the step is positioned at the outer side of the peripheral groove; the thickness of the plate body of the step part is larger than that of the film; a plastic protective film is arranged through the step; the plastic protective film is positioned outside the film; the plastic protective film is provided with a pressure relief hole.

The technical effects of the utility model are as follows:

1. the safety valve and the shell are integrally processed, so that the risk of welding slag generated when the common safety valve is installed on the battery is avoided, and the safety of the battery is improved.

2. The safety valve is formed by scoring the outer side surface of the shell, so that the problem that the safety valve and the battery core compete for the inner space of the battery is avoided, and the problem that the energy density of the battery is reduced due to the arrangement of the safety valve is avoided.

3. The safety valve can set up respectively on the face of difference with battery utmost point post to avoid the influence to battery utmost point post after the relief valve bursts open, reduce the risk of electrolyte to the battery short circuit after the relief valve bursts open.

4. The safety valve can be set at will, especially can set up on the top surface of battery generally to avoid the risk that the electrolyte flows out in a large number after the safety valve bursts open.

Drawings

Fig. 1 is a schematic view of the overall structure of the battery according to the embodiment of the present invention.

Fig. 2 is a schematic sectional view of an embodiment of the safety valve structure of the present invention, wherein the section is enlarged in the thickness direction of the plate body.

Fig. 3 is a schematic top view of a thin film structure.

Wherein 100 is a battery, 101 is a metal shell, 102 is a battery core, and 103 is a thin film structure;

1 is a battery safety valve structure, 11 is a film, 12 is a step, 13 is a peripheral groove, 14 is a middle groove, 15 is a plastic protective film, 16 is a pressure relief hole, and 19 is a cavity.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1, a battery includes a metal case 101 and a battery cell 102 disposed in the metal case 101. A battery safety valve structure 1 is provided in a metal case 101 of the battery. The metal housing 101 is typically an aluminum case. The battery is of a strip-shaped structure, and two positive and negative electrode posts of the battery are respectively arranged at two ends of the battery. The battery safety valve structure 1 is provided on the metal case 101 of the top surface of the battery.

The battery safety valve structure 1, as shown in fig. 2, includes a thin film structure 103 formed by scoring a groove on the outer side surface of a metal case 101. Thin-film structure 103, as shown in FIGS. 2 and 3, includes a thin film 11, a peripheral groove 13 scribed along an edge of thin film 11, and an intermediate groove 14 scribed in thin film 11.

The thickness of the membrane 11 is less than the thickness of the metal housing 101. Generally, the thickness of the film 11 is not more than half of the thickness of the metal case 101, preferably 0.382 of the thickness of the metal case 101. The thickness of the plate body of the peripheral groove 13 is smaller than that of the film 11. The thickness of the plate body of the part of the middle groove 14 is smaller than that of the film 11. The intermediate groove 14 connects the peripheral grooves 13, or, as it were, the intermediate groove 14 communicates with the peripheral grooves 13, so that the film 11 is divided into several parts by the intermediate groove 14. Preferably, the intermediate groove 14 is symmetrical about the center of the membrane 11. The intermediate channel 14 may have an X-shape, or a Z-shape, or a C-shape, or a Y-shape, or an S-shape, or a star-shape, or other regular or irregular shape. For example, in the example shown in fig. 3, the intermediate groove 14 is formed by two C-shaped grooves that are connected to each other, and the two C-shaped grooves are symmetrical to each other.

Further, the peripheral groove 13 and the intermediate groove 14 have the same depth, that is, the thickness of the peripheral groove 13 is the same as the thickness of the intermediate groove 14. The thickness of the plate body in the peripheral groove 13 portion and the intermediate groove 14 portion is generally not more than one third of the thickness of the metal shell 101, preferably 0.618 of the thickness of the membrane 11.

Further, a plastic protective film 15 is arranged outside the film 11. Specifically, thin-film structure 103 also includes a step 12 scribed along the edge of thin film 11. The thickness of the plate body of the step 12 part is larger than that of the film 11 and smaller than that of the metal shell 101. The step 12 is located outside the peripheral groove 13, or it can be said that the peripheral groove 13 is located inside the step 12. The plastic protective film 15 is disposed outside the film 11 by the step 12, so that a cavity 19 is formed between the film 11 and the plastic protective film 15. Specifically, the plastic protective film 15 may be disposed on the step 12 by structural adhesive bonding or thermal welding. After the plastic protective film 15 is disposed on the step 12, the outer surface of the plastic protective film 15 is flush with the outer surface of the metal case 101. That is, the step 12 portion scores the groove depth according to the thickness of the plastic protection film 15. The plastic protective film 15 is preferably a PET film with a thickness of 0.04-1.00 mm. PET is also known as polyethylene terephthalate.

Further, the plastic protective film 15 is provided with a pressure relief hole 16. The pressure relief hole 16 is used to balance the air pressure of the cavity 19 with the outside. For example, when the temperature in the battery rises, the air in the cavity 19 expands, resulting in the air pressure in the cavity 19 being higher than the air pressure in the outside. And the pressure relief hole 16 releases the air pressure generated by the expansion of the air in the cavity 19. In the present embodiment, the pressure release hole 16 is provided in the plastic protective film 15, and those skilled in the art will understand that the pressure release hole 16 may be provided elsewhere or may be provided in plural.

In addition, in the present embodiment, the film structure 103 has a waist-shaped structure. The skilled person understands that the membrane structure 103 may also be circular, or oval, or rectangular, or square, or other regular or irregular shape.

As can be seen from fig. 2, the main structure of the battery safety valve structure 1 of the present invention is scribed on the metal casing 101, and there is no need to strive for space for the battery core inside the battery.

Claims

1. A battery safety valve structure is characterized by comprising a thin film structure (103) formed by scoring a groove on the outer side surface of a metal shell (101); the thin-film structure (103) comprises a thin film (11); the thickness of the film (11) is smaller than that of the metal shell (101).

2. The battery safety valve structure according to claim 1, wherein the thickness of the thin film (11) is not more than half of the thickness of the metal case (101).

3. The battery safety valve structure according to claim 1, further comprising a plastic protective film (15); the thin film structure (103) further comprises a step (12) scribed along the edge of the thin film (11); the thickness of the plate body of the step (12) part is greater than that of the film (11) and less than that of the metal shell (101); a plastic protective film (15) is arranged outside the film (11) by means of a step (12).

4. A battery safety valve structure according to claim 1, 2 or 3, wherein the membrane structure (103) further comprises a peripheral groove (13) scribed along the edge of the membrane (11); the peripheral groove (13) is positioned at the inner side of the step (12); the thickness of the plate body of the peripheral groove (13) part is smaller than that of the thin film (11).

5. The battery safety valve structure according to claim 4, wherein the thin film structure (103) further comprises an intermediate groove (14) engraved in the thin film (11); the middle groove (14) is connected with the peripheral groove (13), so that the film (11) is divided into a plurality of parts by the middle groove (14); the thickness of the plate body of the middle groove (14) part is smaller than that of the thin film (11).

6. The battery safety valve structure according to claim 5, wherein the intermediate groove (14) is symmetrical about the center of the membrane (11) and has an X-shape, or a Z-shape, or a C-shape, or a Y-shape, or an S-shape, or a star-shape.

7. The battery safety valve structure according to claim 5, wherein the depth of the intermediate groove (14) and the peripheral groove (13) is the same, and the thickness of the intermediate groove (14) and the peripheral groove (13) is not more than one third of the thickness of the metal case (101).

8. A battery, characterized in that the battery has a thin film structure (103) formed by scoring a groove on the outer side of a metal casing (101); the thin film structure (103) comprises a thin film (11) and a peripheral groove (13) carved along the edge of the thin film (11); the thickness of the film (11) is smaller than that of the metal shell (101); the thickness of the plate body of the peripheral groove (13) part is smaller than that of the thin film (11).

9. The cell of claim 8, wherein the thin film structure (103) further comprises an intermediate groove (14) scribed in the thin film (11); the middle groove (14) is connected with the peripheral groove (13), so that the film (11) is divided into a plurality of parts by the middle groove (14); the thickness of the plate body of the middle groove (14) part is smaller than that of the thin film (11).

10. The cell according to claim 8 or 9, characterised in that a step (12) is scribed along the edge of the film (11); the step (12) is positioned outside the peripheral groove (13); the thickness of the plate body of the step (12) part is larger than that of the film (11); a plastic protective film (15) is arranged on the step (12); the plastic protective film (15) is positioned outside the film (11); the plastic protective film (15) is provided with a pressure relief hole (16).