WO2019127957A1

WO2019127957A1 - Battery module

Info

Publication number: WO2019127957A1
Application number: PCT/CN2018/081085
Authority: WO
Inventors: 章华; 秦峰; 游志毅; 肖信福; 王娟; 马林
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2017-12-28
Filing date: 2018-03-29
Publication date: 2019-07-04
Also published as: CN207818679U

Abstract

The present invention provides a battery module, comprising: a plurality of batteries, each of the batteries being provided with a battery explosion-proof valve; an upper cover provided with a module explosion-proof valve; and a lower box assembled with the upper cover. An enclosed passage is provided between the upper cover and the plurality of batteries, and the module explosion-proof valve and battery explosion-proof valves are exposed to the enclosed passage. As the module explosion-proof valve and the battery explosion-proof valves are exposed to the enclosed passage, when any one of the plurality of batteries fails, a large amount of high-temperature and high-pressure gas generated at the moment of failure firstly bursts out of its own battery explosion-proof valve and enters the enclosed passage and accumulates gradually in the enclosed passage; and when the accumulated air pressure in the enclosed passage is greater than the opening pressure of the module explosion-proof valve, the high-temperature and high-pressure gas bursts out of the module explosion-proof valve and then is released to the outside of the battery module in a certain direction. Thereby, the damage of the high-temperature and high-pressure gas to the other normal batteries in the battery module is reduced, reducing the probability of fire and explosion.

Description

Battery module

Technical field

The present invention relates to the field of battery technologies, and in particular, to a battery module.

Background technique

In a closed battery module, a failed battery generates a large amount of high-temperature and high-pressure gas at the moment of failure and slowly accumulates inside the battery module, thereby causing damage to other normal batteries, and in severe cases, causing a fire and explosion.

Summary of the invention

In view of the problems in the prior art, an object of the present invention is to provide a battery module capable of discharging a large amount of high-temperature and high-pressure gas out of a battery module in time when a battery fails, and reducing other high-temperature and high-pressure gases to the inside of the battery module. The destruction of the normal battery reduces the probability of fire and explosion due to the accumulation of high temperature and high pressure gas inside the battery module.

In order to achieve the above object, the present invention provides a battery module comprising: a plurality of batteries arranged side by side, each battery being provided with an explosion-proof valve for a battery; an upper cover located above the plurality of batteries and provided with a module An explosion-proof valve; and a lower case, the plurality of batteries are housed and assembled with the upper cover. Wherein, a closed passage is arranged between the upper cover and the plurality of batteries, and the explosion-proof valve for the module and the explosion-proof valve for each battery are exposed in the closed passage.

The beneficial effects of the present invention are as follows:

In the battery module according to the present invention, since the closed passage is provided between the upper cover and the plurality of batteries, and the explosion-proof valve for the module and the explosion-proof valve for each battery are exposed in the closed passage, when When any battery in a battery fails, a large amount of high-temperature and high-pressure gas generated at the moment of failure will first open its own battery explosion-proof valve and enter the closed channel and slowly accumulate in the closed channel, which accumulates in the closed channel. When the air pressure is greater than the opening air pressure of the explosion-proof valve of the module, the high-temperature and high-pressure gas will be flushed out of the module and then released to the outside of the battery module. Therefore, the battery module of the invention reduces the damage of the high temperature and high pressure gas to other normal batteries inside the battery module; reduces the probability of fire and explosion due to the accumulation of high temperature and high pressure gas inside the battery module; and avoids the battery mode The uncontrollable situation caused by undirectional exhaust or explosion.

DRAWINGS

1 is an exploded view of a battery module in accordance with the present invention.

Figure 2 is an assembled view of Figure 1.

Figure 3 is a plan view of Figure 2.

Fig. 4 is a front plan view of the air guiding member of Fig. 1.

Fig. 5 is a rear plan view of the air guiding member of Fig. 1.

Figure 6 is a cross-sectional view taken along line A-A of Figure 3 .

Figure 7 is a cross-sectional view taken along line B-B of Figure 3 .

Figure 8 is a variation of Figure 6.

Fig. 9 is a perspective view of the air guiding member of Fig. 8.

Fig. 10 is a front plan view of Fig. 9;

Fig. 11 is a rear plan view of Fig. 9;

Fig. 12 is another modification of Fig. 6.

Figure 13 is a perspective view of the air guiding member of Figure 12;

Figure 14 is still another variation of Figure 6.

Fig. 15 is still another modification of Fig. 6.

Figure 16 is a modification of Figure 15.

Figure 17 is another variation of Figure 15.

Among them, the reference numerals are as follows:

1 battery 4 air guiding parts

11 battery explosion-proof valve 41 week wall

2 upper cover 411 upper end face

21 module explosion-proof valve 412 lower end

22 upper wall 42 bottom wall

23 wall 43 top wall

24 lower wall 44 opening

25 through holes 45 lower opening

3 lower case S closed channel

Detailed ways

The battery module according to the present invention will be described in detail below with reference to the accompanying drawings.

1 to 17, a battery module according to the present invention includes a plurality of batteries 1 arranged side by side, each battery 1 being provided with a battery explosion-proof valve 11; an upper cover 2 located above the plurality of batteries 1 and disposed There is a module explosion-proof valve 21; and a lower case 3 for accommodating the plurality of batteries 1 and assembling them with the upper cover 2. A closed passage S is disposed between the upper cover 2 and the plurality of batteries 1, and the explosion-proof valve 21 for the module and the explosion-proof valve 11 for each battery are exposed to the closed passage S.

In the battery module according to the present invention, since the closed passage S is provided between the upper cover 2 and the plurality of batteries 1, the explosion-proof valve 21 for the module and the explosion-proof valve 11 for each battery are exposed to the closed passage S. Therefore, when any of the plurality of batteries 1 fails, a large amount of high-temperature and high-pressure gas generated at the moment of failure will first open its own battery explosion-proof valve 11 and enter the closed passage S and in the closed passage S. It gradually accumulates. When the air pressure accumulated in the closed channel S is greater than the opening air pressure of the explosion-proof valve 21 for the module, the high-temperature and high-pressure gas will be flushed out of the module and then released to the outside of the battery module. Therefore, the battery module of the invention reduces the damage of the high temperature and high pressure gas to other normal batteries 1 inside the battery module; reduces the probability of fire and explosion due to the accumulation of high temperature and high pressure gas inside the battery module; and avoids the battery The uncontrollable situation of the module due to undirectional exhaust or explosion.

In addition, the battery module of the present invention has a simple structure, is easy to assemble, and reduces the cost, and the arrangement of the closed channel S between the upper cover 2 and the plurality of batteries 1 is also various, and now the closed channel S is The following setting methods are described in detail.

Referring to FIGS. 1 through 7, the battery module may further include: a gas guiding member 4 disposed between the upper cover 2 and the plurality of batteries 1. The air guiding member 4 may have a peripheral wall 41 that abuts and seals face-to-face with the lower surface of the upper cover 2, and the peripheral wall 41 encloses an upper opening 44, the module is exposed to the upper opening 44 by the explosion-proof valve 21; and the bottom wall 42, The upper surface of each of the batteries 1 is surface-contacted and sealed, and the bottom wall 42 is connected to the peripheral wall 41 and forms a groove structure together with the peripheral wall 41 and is provided with a plurality of spaced apart lower openings 45, each of which is exposed to the corresponding explosion-proof valve 11 A lower opening 45. Among them, the closed passage S is formed by the peripheral wall 41 of the air guiding member 4, the bottom wall 42, and the upper cover 2.

Referring to FIGS. 8 to 11, the battery module may further include: a gas guiding member 4 disposed between the upper cover 2 and the plurality of batteries 1. The air guiding member 4 may have a peripheral wall 41 that is surface-contacted and sealed to the lower surface of the upper cover 2, and a lower end surface 412 that is in face-to-face contact with the upper surface of each of the batteries 1 and sealed, and the peripheral wall 41 has an upper opening 44 and the lower opening 45 and the hollow cavity, the module is exposed to the upper opening 44 by the explosion-proof valve 21, and each battery is exposed to the lower opening 45 by the explosion-proof valve 11. Among them, the closed passage S is formed by the air guiding member 4, the upper cover 2, and the upper surfaces of all the batteries 1.

Referring to FIGS. 12 and 13 , the battery module may further include a gas guiding member 4 disposed between the upper cover 2 and the plurality of batteries 1 . The air guiding member 4 may have a top wall 43 that is surface-contacted and sealed to the lower surface of the upper cover 2, and the top wall 43 is provided with an upper opening 44, and the module is exposed to the upper opening 44 by the explosion-proof valve 21; the peripheral wall 41, The upper end is connected to the top wall 43; and the bottom wall 42 is in contact with and sealed to the upper surface of each of the batteries 1. The bottom wall 42 is connected to the lower end of the peripheral wall 41 and is provided with a plurality of spaced apart lower openings 45. The valve 11 is exposed in a corresponding one of the lower openings 45. Among them, the closed passage S is formed by the top wall 43, the peripheral wall 41, and the bottom wall 42 of the air guiding member 4.

Referring to FIG. 14 , the battery module may further include: a gas guiding member 4 disposed between the upper cover 2 and the plurality of batteries 1 . The air guiding member 4 may have a top wall 43 that abuts and seals face-to-face with the lower surface of the upper cover 2, and the top wall 43 is provided with an upper opening 44, the module is exposed to the upper opening 44 by the explosion-proof valve 21; and the peripheral wall 41 The upper end surface 411 is connected to the top wall 43, the lower end surface 412 is surface-contacted and sealed to the upper surface of each of the batteries 1, and the peripheral wall 41 encloses a lower opening 45, and each battery is exposed to the lower opening 45 by the explosion-proof valve 11. Among them, the closed passage S is formed by the top wall 43 of the air guiding member 4, the peripheral wall 41, and the upper surfaces of all the batteries 1.

It is additionally noted that the air guiding members 4 are used in the above-described several arrangements of the closed passage S, but the specific structure of the air guiding members 4 is different. The air guiding members 4 of the above several structures may be made of plastic or metal materials, but the material of the air guiding members 4 is not limited thereto and the structure of the air guiding members 4 is not limited to the above. According to the different working environment of the battery module, the material and structure of the air guiding member 4 can be reasonably adjusted.

The battery module may further include: a spacer (such as a harness isolation board) disposed between the upper cover 2 and the plurality of batteries 1. In order to simplify the structure of the battery module, the air guiding member 4 may be integrally formed with the partitioning plate (ie, the air guiding member 4 and the partitioning plate are integrated into one body).

In order to further simplify the structure of the battery module, the arrangement of the above-described air guiding member 4 can be eliminated. Specifically, a closed passage S may be provided between the upper cover 2 and the plurality of batteries 1 by improving the structure of the upper cover 2 or the assembly relationship between the upper cover 2 and the lower case 3, as shown in FIGS. 15 to 17. Show.

Referring to Fig. 15, the upper cover 2 may have an upper wall 22, an explosion-proof valve 21 for a module, and a surrounding wall 23, the upper end of which is connected to the upper wall 22, and the outer peripheral surface of the surrounding wall 23 is sealingly fitted to the lower casing 3. Among them, the closed passage S is formed by the upper wall 22 of the upper cover 2, the surrounding wall 23, the lower case 3, and the upper surfaces of all the batteries 1.

Referring to Fig. 16, the upper cover 2 may have: an upper wall 22, an explosion-proof valve 21 for a module; and a surrounding wall 23, the upper end being connected to the upper wall 22; the lower wall 24, facing the upper surface of each of the batteries 1 and Sealed, the lower wall 24 is connected to the lower end of the surrounding wall 23 and is provided with a plurality of spaced apart through holes 25, each of which is exposed to a corresponding through hole 25 by an explosion-proof valve 11. Among them, the closed passage S is formed by the upper wall 22 of the upper cover 2, the surrounding wall 23, and the lower wall 24.

Referring to Fig. 17, the upper cover 2 may have an upper wall 22 on which an explosion-proof valve 21 for a module is provided, and an outer peripheral surface of the upper wall 22 is sealingly fitted to the lower casing 3. The closed passage S is formed by the upper wall 22 of the upper cover 2, the lower case 3, and the upper surfaces of all the batteries 1.

In the battery module according to the present invention, the upper cover 2 may be made of a metal material. The lower case 3 can also be made of a metal material. The upper cover 2 can be welded and connected to the lower case 3.

Claims

A battery module comprising:

a plurality of batteries (1) are arranged side by side, and each battery (1) is provided with a battery explosion-proof valve (11);

An upper cover (2) located above the plurality of batteries (1) and provided with an explosion-proof valve (21) for the module;

a lower case (3) for accommodating the plurality of batteries (1) and assembling with the upper cover (2);

The utility model is characterized in that a closed passage (S) is arranged between the upper cover (2) and the plurality of batteries (1), and the explosion-proof valve (21) for the module and the explosion-proof valve (11) for each battery are exposed to the closed passage. (S).
The battery module according to claim 1, wherein

The battery module further includes: a gas guiding member (4) disposed between the upper cover (2) and the plurality of batteries (1);

The air guiding member (4) has:

The peripheral wall (41) is surface-contacted and sealed to the lower surface of the upper cover (2), and the peripheral wall (41) encloses an upper opening (44), and the module is exposed to the upper opening (44) by an explosion-proof valve (21); as well as

The bottom wall (42) is surface-contacted and sealed with the upper surface of each battery (1), and the bottom wall (42) is connected to the peripheral wall (41) and forms a groove structure together with the peripheral wall (41) and is provided with a plurality of spaced apart a lower opening (45), each battery is exposed to a corresponding lower opening (45) with an explosion-proof valve (11);

Among them, the closed passage (S) is formed by the peripheral wall (41), the bottom wall (42) and the upper cover (2) of the air guiding member (4).
The battery module according to claim 1, wherein

The battery module further includes: a gas guiding member (4) disposed between the upper cover (2) and the plurality of batteries (1);

The air guiding member (4) has a peripheral wall (41), the upper end surface (411) is surface-contacted and sealed to the lower surface of the upper cover (2), and the lower end surface (412) is surface-contacted with the upper surface of each of the batteries (1). And sealed, and the peripheral wall (41) is surrounded by an upper opening (44) and a lower opening (45) and a hollow cavity, and the module is exposed to the upper opening (44) by an explosion-proof valve (21), and each battery explosion-proof valve ( 11) exposed to the lower opening (45);

Among them, the closed passage (S) is formed by the air guiding member (4), the upper cover (2), and the upper surface of all the batteries (1).
The battery module according to claim 1, wherein

The battery module further includes: a gas guiding member (4) disposed between the upper cover (2) and the plurality of batteries (1);

The air guiding member (4) has:

The top wall (43) is surface-contacted and sealed to the lower surface of the upper cover (2), and the top wall (43) is provided with an upper opening (44), and the module is exposed to the upper opening (44) by an explosion-proof valve (21) in;

a peripheral wall (41), the upper end being connected to the top wall (43);

The bottom wall (42) is in contact with and sealed to the upper surface of each battery (1), and the bottom wall (42) is connected to the lower end of the peripheral wall (41) and is provided with a plurality of spaced lower openings (45), each battery Exposing to a corresponding lower opening (45) with an explosion-proof valve (11);

Among them, the closed passage (S) is formed by the top wall (43), the peripheral wall (41), and the bottom wall (42) of the air guiding member (4).
The battery module according to claim 1, wherein

The battery module further includes: a gas guiding member (4) disposed between the upper cover (2) and the plurality of batteries (1);

The air guiding member (4) has:

The top wall (43) is surface-contacted and sealed to the lower surface of the upper cover (2), and the top wall (43) is provided with an upper opening (44), and the module is exposed to the upper opening (44) by an explosion-proof valve (21) Medium;

a peripheral wall (41), an upper end surface (411) is connected to the top wall (43), a lower end surface (412) is surface-contacted and sealed to the upper surface of each of the batteries (1), and the peripheral wall (41) is surrounded by a lower opening (45) , each battery is exposed to the lower opening (45) with an explosion-proof valve (11);

Among them, the closed passage (S) is formed by the top wall (43) of the gas guiding member (4), the peripheral wall (41), and the upper surface of all the batteries (1).
The battery module according to claim 1, wherein the upper cover (2) has:

The upper wall (22) is provided with an explosion-proof valve (21) for the module;

a surrounding wall (23), the upper end is connected to the upper wall (22) and the outer peripheral surface of the surrounding wall (23) is sealingly assembled to the lower case (3);

Among them, the closed passage (S) is formed by the upper wall (22) of the upper cover (2), the surrounding wall (23), the lower case (3), and the upper surface of all the batteries (1).
The battery module according to claim 1, wherein the upper cover (2) has:

The upper wall (22) is provided with an explosion-proof valve (21) for the module;

a surrounding wall (23), the upper end is connected to the upper wall (22);

The lower wall (24) is in contact with and sealed to the upper surface of each of the batteries (1), and the lower wall (24) is connected to the lower end of the surrounding wall (23) and is provided with a plurality of spaced apart through holes (25), each The battery explosion-proof valve (11) is exposed to a corresponding through hole (25);

Among them, the closed passage (S) is formed by the upper wall (22), the surrounding wall (23) and the lower wall (24) of the upper cover (2).
The battery module according to claim 1, wherein

The upper cover (2) has an upper wall (22), and an explosion-proof valve (21) for the module is arranged, and an outer peripheral surface of the upper wall (22) is sealed and assembled with the lower casing (3);

The closed passage (S) is formed by the upper wall (22) of the upper cover (2), the lower case (3), and the upper surface of all the batteries (1).
The battery module according to claim 1, wherein the battery module further comprises: a partition plate disposed between the upper cover (2) and the plurality of batteries (1).
The battery module according to claim 9, wherein the air guiding member (4) is integrally formed with the partitioning plate.