CN219832879U

CN219832879U - Battery device

Info

Publication number: CN219832879U
Application number: CN202320751229.3U
Authority: CN
Inventors: 赵冬
Original assignee: China Innovation Aviation Technology Group Co ltd
Current assignee: China Innovation Aviation Technology Group Co ltd
Priority date: 2023-04-04
Filing date: 2023-04-04
Publication date: 2023-10-13
Anticipated expiration: 2033-04-04

Abstract

The utility model discloses a battery device, which comprises a battery box body, wherein the battery box body comprises a beam body, a cover plate and a sealing element, the cover plate is covered on the beam body, and the sealing element is arranged between the cover plate and the beam body so as to seal the cover plate and the beam body; the battery pack is arranged in the battery box body and comprises a plurality of single batteries which are distributed along a first direction, and explosion-proof valves are arranged at the ends of the single batteries in the length direction and correspond to the sealing elements; the extension section is connected to the beam body and/or the cover plate and extends towards the sealing element so as to be blocked between the explosion-proof valve and the sealing element. According to the battery device, the extending section is formed by extending downwards at the cover plate or by extending upwards on the beam body, and the high-heat medium which can be sprayed out of the explosion-proof valve after being opened is blocked by the extending section, so that the high-heat medium can be prevented from being sprayed onto the sealing element, and the risk of thermal runaway caused by oxygen entering due to sealing failure of the box body is reduced.

Description

Battery device

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery device.

Background

Currently, with the promotion and development of a power battery system, CIR, CTP, CTC and other technologies are applied to the battery system successively, and the safety performance of the battery system is becoming more and more interesting.

Thermal runaway is the most serious safety accident of a battery, and electric energy and chemical energy stored in the battery are released in a large amount in a short time, so that the temperature in the battery can reach more than 900 ℃, and meanwhile, in the thermal runaway process, a large amount of gas can appear in the decomposition of electrolyte and active substances, so that the pressure in the battery is increased sharply, and the explosion of the battery is caused. In order to ensure the safety of the battery, an explosion-proof valve is usually arranged on a battery shell, so that the explosion-proof valve can be timely destroyed when the pressure is too high, the pressure in the battery is released, the explosion of the battery in the thermal runaway process is prevented, and the safety of passengers is ensured.

However, in the prior art, when the explosion-proof valve is opened, the high heat medium sprayed out by the explosion-proof valve can impact on the sealing gasket between the box body and the box cover, so that the sealing of the battery box body is invalid, air enters, and thermal runaway is further caused.

Disclosure of Invention

In order to overcome the defects of the prior art, the utility model aims to provide a battery device, which is characterized in that an extension section is arranged on a cover plate or a beam of a battery box body, extends towards a sealing element and is blocked between an explosion-proof valve and the sealing element, so that the direct injection of high-heat medium to the sealing element is reduced.

The utility model adopts the following technical scheme:

a battery device, comprising:

the battery box body comprises a beam body, a cover plate and a sealing piece, wherein the cover plate is covered on the beam body, and the sealing piece is arranged between the cover plate and the beam body so as to seal the cover plate and the beam body;

the battery pack is arranged in the battery box body and comprises a plurality of single batteries which are distributed along a first direction, and explosion-proof valves are arranged at the ends of the single batteries in the length direction and correspond to the sealing elements;

the extension section is connected to the beam body and/or the cover plate and extends towards the sealing element so as to be blocked between the explosion-proof valve and the sealing element.

Compared with the prior art, the utility model has the beneficial effects that:

according to the battery device, the explosion-proof valve is arranged at the end part of the first end face of the battery, which is close to the first end face, the cover plate is in sealing connection with the beam body through the sealing element, the cover plate downwards extends to form the extension section or upwards extends on the beam body to form the extension section, and the extension section is used for blocking high-heat medium which is sprayed out of the explosion-proof valve after being opened, so that the high-heat medium is prevented from being sprayed onto the sealing element, and the risk of thermal runaway caused by oxygen entering due to sealing failure of the box body is reduced.

Drawings

Fig. 1 is a schematic structural view of a battery pack according to an embodiment of the present disclosure;

fig. 2 is a partial cross-sectional view of a battery pack provided in embodiment 1 of the present disclosure;

fig. 3 is a partial cross-sectional view of a battery pack provided in embodiment 2 of the present disclosure;

fig. 4 is a partial sectional view of a battery pack provided in embodiment 3 of the present disclosure.

In the figure: 1. a battery case; 11. a beam body; 12. a cover plate; 13. a seal; 14. an extension section; 2. a single battery; 21. an explosion-proof valve.

Detailed Description

The utility model will be further described with reference to the accompanying drawings and detailed description below:

in the description of the present utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

The utility model is described in further detail below with reference to the accompanying drawings.

In the case of example 1,

as shown in fig. 1 to 4, a battery device includes a battery case 1, a battery pack, and an extension section 14, the battery case 1 includes a beam 11, a cover 12, and a sealing member 13, the cover 12 covers the beam 11, the sealing member 13 is disposed between the cover 12 and the beam 11 to seal the cover 12 and the beam 11; the battery pack is arranged in the battery box body 1, the battery pack comprises a plurality of single batteries 2 which are arranged along a first direction, an explosion-proof valve 21 is arranged at the end part of the single batteries 2 along the length direction, and the explosion-proof valve 21 is arranged corresponding to the sealing piece 13; the extension 14 is connected to the beam 11 and/or the cover 12 and extends towards the seal 13 to block the explosion-proof valve 21 from the seal 13.

On the basis of the above structure, the beam body 11 comprises both side beams and separation beams, the battery box body 1 is formed by surrounding the side beams, in the battery box body 1, the whole battery box body 1 is separated into a plurality of battery cavities by the separation beams, the battery pack is arranged in the battery cavities, the cover plate 12 covers the battery box body 1, and the installation gap between the cover plate 12 and the battery box body 1 is sealed by the sealing piece 13.

The battery pack comprises a plurality of single batteries 2, and the plurality of single batteries 2 in each battery pack are distributed along the first direction. An extension 14 is provided at the connection of the cover plate 12 to the beam body 11, wherein the extension 14 can be blocked between the sealing element 13 and the explosion-proof valve 21 of the unit cell 2, so that the direct injection of the high-temperature medium onto the sealing element 13 can be prevented.

In the present embodiment, specifically, the longitudinal direction of the battery case 1 is defined as the first direction, the width direction of the battery case 1 is defined as the left-right direction, and the direction in which the cover 12 is located is defined as the upper direction. The explosion-proof valve 21 is provided at an end corner in the longitudinal direction of the unit cell 2, and the following description will be made with reference thereto.

In the prior art, when thermal runaway occurs in the unit cell 2, electric energy and chemical energy stored inside the cell are largely released in a short time so that the temperature inside the cell can reach 900 ℃ or more, and at the same time, in the thermal runaway process, a large amount of gas occurs due to decomposition of the electrolyte and the active material, thereby causing a sharp increase in the pressure inside the cell, causing explosion of the unit cell 2. Therefore, in order to ensure the safety of the battery, an explosion-proof valve 21 is usually disposed on the battery housing, when the internal pressure of the battery is too high, the explosion-proof valve 21 can be timely destroyed to release the internal pressure of the battery, and a large amount of high heat medium can be sprayed outwards from the explosion-proof valve 21, but if the high heat medium is sprayed onto the sealing member 13, the sealing member 13 can be destroyed, so that external oxygen enters the battery box 11 to further cause thermal runaway of the battery, thereby causing injury to passengers.

When the battery is in thermal runaway, the high heat medium in the single battery 2 can burst the explosion-proof valve 21 to be sprayed outwards, and the extension section 14 is blocked between the explosion-proof valve 21 and the sealing piece 13, so that the high heat medium can firstly impact on the extension section 14, and the high heat medium is reduced to be directly sprayed to the sealing piece 13 due to the blocking effect of the extension section 14, so that the probability of damage of the sealing piece 13 due to the direct spraying of the high heat medium is reduced, the condition of oxygen entering due to sealing failure is further reduced, and the risk of further spreading of the thermal runaway is reduced.

Further, as shown in fig. 2 to 4, the extension section 14 is disposed opposite to the explosion-proof valve 21.

On the basis of the above-described structure, the explosion-proof valve 21 on the corner of the end portion in the longitudinal direction of the unit cell 2 is provided at a position corresponding to the extension section 14, that is, the explosion-proof valve 21 is close to the extension section 14, and the opening of the explosion-proof valve 21 is opposed to the extension section 14. Specifically, in this embodiment, the upper end face of the unit cell 2 near the end of the beam 11 is provided with an explosion-proof valve 21, that is, the corner of the left end or the right end of the upper end face of the unit cell 2 is provided with the explosion-proof valve 21.

When explosion-proof valve 21 sets up the left end or the right-hand member at the battery cell 2 up end, because the opening of explosion-proof valve 21 sets up with extension 14 relatively, after battery cell 2 takes place thermal runaway, high thermal medium can directly break explosion-proof valve 21 to along the opening direct injection to extension 14 on, and be blocked by extension 14, so set up can reduce high thermal medium direct injection to the other directions of group battery, reduce the risk that causes other battery likewise to take place thermal runaway, reduce thermal runaway's risk, and then the security performance of battery has relatively been improved.

Besides being disposed at the left end or the right end of the upper end face of the unit cell 2, the explosion-proof valve 21 may be disposed at both the left end and the right end of the upper end face of the unit cell 2, and both the left end face and the right end face of the unit cell 2 are disposed toward the beam 11, so that the explosion-proof valve 21 is disposed at both the upper end face, and the high heat medium at both the left end and the right end is also sprayed onto the extension sections 14 at both the left end and the right end, so that the direct spraying of the high heat medium onto the sealing member 13 can be reduced. Of course, the explosion-proof valves 21 may be provided at other portions of the battery, such as the lower end face of the battery, and the number of the explosion-proof valves 21 is not limited in the present utility model.

It should be noted that the extension section 14 has several arrangements,

the first arrangement is that the extension 14 is connected to the cover plate 12, i.e. the cover plate 12 extends in the direction of the beam 11 to form the extension 14.

The second arrangement is that the extension 14 is connected to the beam 11, i.e. the beam 11 extends in the direction of the cover 12 to form the extension 14.

The third arrangement is that the extension section is connected with the cover plate 12 and also connected with the beam body 11, namely, the cover plate 12 extends towards the direction of the beam body 11 to form a first extension section 14, the beam body 11 also extends towards the direction of the cover plate 12 to form a second extension section 14, and the end parts of the first extension section 14 and the second extension section 14 are mutually abutted.

The fourth arrangement is that the extension section is connected with the cover plate 12 and also connected with the beam body 11, that is, the cover plate 12 extends in the direction of the beam body 11 to form a first extension section 14, the beam body 11 also extends in the direction of the cover plate 12 to form a second extension section 14, and the first extension section 14 at least partially overlaps the second extension section 14.

Example 2 based on the structure of example 1 described above,

the present embodiment is described by taking the first arrangement of the extension section 14 as an example,

further, as shown in fig. 2, the extension section 14 is connected to the cover plate 12 and extends toward the beam 11.

On the basis of the structure, the extension section 14 is formed by extending the cover plate 12 downwards, and the extension section 14 is a concave formed by punching the cover plate 12 downwards, so that a V-shaped concave part is formed, and the V-shaped concave part is blocked between the sealing piece 13 and the explosion-proof valve 21.

In this embodiment, the cover plate 12 is recessed downwards to form the extension section 14, and the extension section 14 is blocked between the sealing member 13 and the explosion-proof valve 21, when the thermal runaway occurs in the unit battery 2, the opening of the explosion-proof valve 21 faces the extension section 14, and the high heat medium is firstly sprayed onto the extension section 14 formed by the recessed downwards of the cover plate 12 and flows downwards along the extension section 14, so that the probability that the sealing member 13 is damaged due to the direct spraying of the high heat medium onto the sealing member 13 can be reduced.

Besides the V-shaped recess formed by punching the cover plate 12 downwards, the U-shaped recess may be formed by punching the cover plate 12 downwards, or other recesses may be formed, or other conventional techniques may be adopted, the recess formed by the cover plate 12 may be blocked between the sealing member 13 and the explosion-proof valve 21, or the cover plate 12 may be extended downwards to form a blocking surface, which is disposed between the sealing member 13 and the explosion-proof valve 21, in this embodiment, the forming of the extension section 14 is not limited, and only the extension section 14 capable of being formed downwards by the cover plate 12 may be required to block the high heat medium sprayed by the explosion-proof valve 21, so that the blocking surface may be selected and set according to the actual situation.

Further, the seal 13 has a first end face facing the beam 11, and the extension 14 extends away from the end of the cover plate 12 beyond the first end face.

On the basis of the above structure, the sealing member 13 has a first end face facing the beam body 11, i.e., a lower end face of the sealing member 13, and the end of the extending section 14 formed by the cover plate 12 recessed downward is beyond the first end face of the sealing member 13, i.e., the projection of the extending section 14 in the direction of the beam body 11 is to cover the entire sealing member 13.

If the projection of the extension 14 in the direction of the beam 11 does not cover the entire sealing member 13 completely, when thermal runaway occurs in the battery, the high heat medium is sprayed toward the extension 14, and there may be a portion of the high heat medium sprayed directly onto the sealing member 13 along the lower end of the extension 14, thereby damaging the sealing member 13 and disabling the sealing of the sealing member 13, thereby causing oxygen to be able to enter the battery case 1, and increasing the speed of the thermal runaway.

Therefore, in the present embodiment, when the cover 12 is recessed downward to form the extension section 14 and the extension section 14 extends downward, the end portion away from the cover 12 exceeds the first end face, i.e. the lower end face, of the sealing member 13, so that when the unit battery 2 is thermally out of control, the high heat medium is directly sprayed to the extension section 14, and because the coverage area of the extension section 14 is wider, most of the high heat medium is blocked by the extension section 14, the probability that the high heat medium breaks through the blocking of the extension section 14 and is directly sprayed to the sealing member 13 is reduced, and further the probability that the sealing member 13 is damaged is reduced, and the risk that the thermal out of control further occurs is reduced.

Further, the extension 14 is located near the side of the beam 11.

On the basis of the above-described structure, in the process of machining the extension section 14, machining is performed at a position where the cover plate 12 is close to the beam body 11 so that the smaller the extension section 14 is on the side close to the beam body 11, that is, the smaller the gap between the extension section 14 and the beam body 11 is.

When the extension 14 is close to the side of the beam 11, the high heat medium sprayed from the battery explosion-proof valve 21 can be more effectively blocked. When the battery is out of control, the pressure in the battery can promote the high heat medium to be sprayed outwards, and because the pressure in the battery is overlarge, when the high heat medium is sprayed outwards, the situation of sputtering everywhere can be generated, and the extending section 14 is arranged on one side close to the beam body 11, and the gap between the extending section 14 and the sealing piece 13 is smaller, when the high heat medium is sputtered everywhere, the high heat medium can be blocked by the extending section 14 finally, and the probability that the high heat medium can be directly sputtered onto the sealing piece 13 along the gap between the extending section 14 and the sealing piece 13 to damage the sealing piece 13 is reduced, and the risk that the heat spreading further occurs is reduced.

Example 3 based on the structure of example 1 described above,

this embodiment is described by taking the second arrangement of the extension 14 as an example,

further, as shown in fig. 3, the extension section 14 is connected to the beam 11 and extends toward the cover plate 12.

On the basis of the above structure, the extension section 14 is formed by extending the beam 11 upward, and the extension section 14 is formed by extending the side surface of the beam 11, which is close to the battery pack, upward, forming a blocking surface between the sealing member 13 and the explosion-proof valve 21.

In this embodiment, the beam 11 is extended upwards to form a blocking surface near the side of the battery pack, and is blocked between the sealing member 13 and the explosion-proof valve 21, when the thermal runaway occurs in the unit battery 2, the opening of the explosion-proof valve 21 faces the extension section 14, and the high heat medium is sprayed onto the blocking surface first and flows downwards along the blocking surface, so that the probability that the high heat medium is directly sprayed onto the sealing member 13 to damage the sealing member 13 can be reduced.

Further, the sealing member 13 has a second end face facing the cover plate 12, and the extension 14 extends away from the end of the beam 11 beyond the second end face.

On the basis of the above construction, the sealing member 13 has a second end face directed toward the cover plate 12, i.e., an upper end face of the sealing member 13, and the end of the beam body 11, which is extended upward to form the blocking face away from the cover plate 12, is beyond the second end face of the sealing member 13, i.e., the projection of the extension 14 in the direction of the beam body 11 is to cover the entire sealing member 13.

If the projection of the extension 14 in the direction of the beam 11 does not cover the entire sealing member 13 completely, when thermal runaway occurs in the battery, the high heat medium is sprayed toward the extension 14, and there may be a portion of the high heat medium sprayed directly onto the sealing member 13 along the upper end of the extension 14, thereby damaging the sealing member 13 and disabling the sealing of the sealing member 13, thereby causing oxygen to be able to enter the battery case 1, and increasing the speed of the thermal runaway.

Therefore, in this embodiment, when the beam 11 extends upward to form a blocking surface and the extension section 14 extends upward, the end portion far away from the cover plate 12 exceeds the second end surface, i.e. the upper end surface, of the sealing member 13, so that when the unit cell 2 undergoes thermal runaway, the high heat medium is directly sprayed to the extension section 14, and due to the wider coverage area of the extension section 14, most of the sprayed high heat medium is blocked by the extension section 14, so that the probability that the high heat medium breaks through the blocking of the extension section 14 and is directly sprayed to the sealing member 13 is reduced, and further the probability that the sealing member 13 is damaged is reduced, and the risk that thermal runaway further occurs is reduced.

Example 4 based on the structure of example 1 described above,

the present embodiment is described by taking the third arrangement of the extension section 14 as an example,

further, the cover plate 12 and the beam body 11 are provided with extension sections 14; the extension section 14 connected with the cover plate 12 is a first extension section 14, and the first extension section 14 extends towards the beam 11; the extension section 14 connected with the beam 11 is a second extension section 14, and the second extension section 14 extends towards the cover plate 12; the end of the first extension 14 away from the cover plate 12 abuts against the end of the second extension 14 away from the beam 11.

On the basis of the above-described structure, in the present embodiment, the extension section 14 includes both the first extension section 14 formed by extending the cover plate 12 downward and the second extension section 14 formed by extending the beam body 11 upward, and the lower end portion of the first extension section 14 abuts against the upper end portion of the second extension section 14 to close the path from the explosion-proof valve 21 to the seal 13.

That is, when the thermal runaway occurs in the single battery 2, a larger pressure is accumulated in the battery, and the pressure pushes the high heat medium in the battery to break through the explosion-proof valve 21 and spray outwards, and when the first extension section 14 is abutted against the second extension section 14, the path of the explosion-proof valve 21 to the sealing member 13 is jointly closed by the first extension section 14 and the second extension section 14, and the high heat medium is sprayed to the extension section 14 and blocked by the extension section 14, so that the probability that the sealing member 13 is damaged due to the fact that the high heat medium is directly sprayed to the sealing member 13 can be effectively reduced, and the risk of heat spreading is further reduced.

Example 5 based on the structure of example 1 described above,

the present embodiment is described taking the fourth arrangement of the extension section 14 as an example,

further, the cover plate 12 and the beam body 11 are provided with extension sections 14; the extension section 14 connected with the cover plate 12 is a first extension section 14, and the first extension section 14 extends towards the beam 11; the extension section 14 connected with the beam 11 is a second extension section 14, and the second extension section 14 extends towards the cover plate 12; the first extension 14 at least partially overlaps the second extension 14.

On the basis of the above structure, in the present embodiment, the extension section 14 includes both the first extension section 14 formed by extending the cover plate 12 downward and the second extension section 14 formed by extending the beam 11 upward, the lower end portion of the first extension section 14 exceeds the upper end portion of the second extension section 14, and the first extension section 14 and the second extension section 14 at least partially overlap and abut together.

That is, when the single battery 2 is out of control, a larger pressure is accumulated in the battery, the pressure pushes the high heat medium in the battery to break the explosion-proof valve 21 and spray outwards, and when the first extension section 14 and the second extension section 14 are partially overlapped and are close to each other, the path of the explosion-proof valve 21 to the sealing member 13 is jointly closed by the first extension section 14 and the second extension section 14, the high heat medium is sprayed to the extension section 14 and blocked by the extension section 14, so that the probability of damage to the sealing member 13 caused by direct spraying of the high heat medium to the sealing member 13 can be effectively reduced, and the risk of heat spreading is further reduced

It will be apparent to those skilled in the art from this disclosure that various other changes and modifications can be made which are within the scope of the utility model as defined in the appended claims.

Claims

1. A battery device, characterized by comprising:

the battery box body (1), the battery box body (1) comprises a beam body (11), a cover plate (12) and a sealing piece (13), the cover plate (12) is covered on the beam body (11), and the sealing piece (13) is arranged between the cover plate (12) and the beam body (11) so as to seal the cover plate (12) and the beam body (11);

the battery pack is arranged in the battery box body (1) and comprises a plurality of single batteries (2) which are distributed along a first direction, explosion-proof valves (21) are arranged at the ends of the single batteries (2) in the length direction, and the explosion-proof valves (21) are arranged corresponding to the sealing pieces (13);

and the extension section (14) is connected to the beam body (11) and/or the cover plate (12) so as to be blocked between the explosion-proof valve (21) and the sealing piece (13).

2. The battery device according to claim 1, characterized in that the extension (14) is arranged opposite the explosion-proof valve (21).

3. Battery device according to claim 1, characterized in that the extension (14) is connected to the cover plate (12) and extends towards the beam (11).

4. A battery device according to claim 3, characterized in that the seal (13) has a first end face which faces the beam (11), the end of the extension (14) remote from the cover plate (12) extending beyond the first end face.

5. A battery device according to claim 3, characterized in that the extension (14) is adjacent to one side of the beam (11).

6. The battery device according to claim 1, characterized in that the extension (14) is connected to the beam (11) and extends in the direction of the cover plate (12).

7. The battery device according to claim 6, characterized in that the seal (13) has a second end face which faces the cover plate (12), the end of the extension (14) remote from the beam body (11) extending beyond the second end face.

8. The battery device according to claim 1, characterized in that the cover plate (12) and the beam body (11) are provided with the extension section (14); the extension section (14) connected with the cover plate (12) is a first extension section (14), and the first extension section (14) extends towards the beam body (11); the extension section (14) connected with the beam body (11) is a second extension section (14), and the second extension section (14) extends towards the cover plate (12); the end part of the first extension section (14) far away from the cover plate (12) is abutted against the end part of the second extension section (14) far away from the beam body (11).

9. The battery device according to claim 1, characterized in that the cover plate (12) and the beam body (11) are provided with the extension section (14); the extension section (14) connected with the cover plate (12) is a first extension section (14), and the first extension section (14) extends towards the beam body (11); the extension section (14) connected with the beam body (11) is a second extension section (14), and the second extension section (14) extends towards the cover plate (12); the first extension (14) at least partially overlaps the second extension (14).