CN212991231U

CN212991231U - Explosion-proof battery

Info

Publication number: CN212991231U
Application number: CN202021386104.8U
Authority: CN
Inventors: 徐基维; 张能; 林豈庆; 王运鹏
Original assignee: Huarui Mining Technology Co ltd
Current assignee: Huarui Mining Technology Co ltd
Priority date: 2020-07-14
Filing date: 2020-07-14
Publication date: 2021-04-16
Anticipated expiration: 2030-07-14

Abstract

The application provides an explosion-proof battery, includes: a first box and a second box; the battery module is arranged in the first box body and comprises a first area and a second area; the power supply control module is arranged in the second box body; the first pressure relief device is arranged between the first box body and the second box body and used for relieving the pressure in the first box body to the second box body; and the second pressure relief device is arranged in the second box body and used for releasing the pressure in the second box body to the outside so as to realize the explosion-proof protection of the battery module.

Description

Explosion-proof battery

Technical Field

The utility model relates to a battery technology field especially relates to an explosion-proof battery.

Background

With the increasing demand for the capacity of storage batteries and the decreasing demand for the volume of various electronic and electrical devices used in explosive mixture environments, the current industrial production tends to select lithium ion batteries with higher energy density. However, the higher the energy density of the battery, the more factors affecting the safety of use, and therefore, the requirements for explosion protection of lithium ion batteries used in explosive mixture environments are also more stringent.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving at least one of the technical problems in the related art to a certain extent.

Therefore, the utility model provides an explosion-proof battery to the explosion-proof protection to the battery module is realized.

In order to achieve the above object, the utility model provides an explosion-proof battery, include: a first box and a second box;

the battery module is arranged in the first box body and comprises a first area and a second area;

the power supply control module is arranged in the second box body;

the first pressure relief device is arranged between the first box body and the second box body and used for relieving the pressure in the first box body to the second box body;

and the second pressure relief device is arranged in the second box body and is used for relieving the pressure in the second box body to the outside.

In some embodiments, the second region includes all pressure relief valves in the battery module

In some embodiments, a first potting layer covering the first area of the battery module, the first potting layer having a first opening corresponding to the pressure relief valve such that the pressure relief valve can vent gas through the first opening; and

and a second pouring layer at least covering the second area of the battery module, wherein the impact strength of the second pouring layer is smaller than that of the pressure release valve when the pressure release valve is opened, so that the pressure release valve breaks the second pouring layer when opened.

In some embodiments, the second potting layer also covers the first area, and the impact strength of the second potting layer is less than the impact strength of the first potting layer.

In some embodiments, the third encapsulation layer covers the second encapsulation layer, wherein the third encapsulation layer has a second opening at the position of the pressure release valve, the second opening corresponds to the pressure release valve, so that the pressure release valve can exhaust gas through the second opening, the impact strength of the third encapsulation layer is greater than that of the first encapsulation layer, and the first encapsulation layer, the second encapsulation layer and the third encapsulation layer are made of silica gel or epoxy resin.

In some embodiments, a first pressure sensor disposed within the first tank;

a second pressure sensor disposed within the second tank, wherein a pressure threshold of the second pressure sensor is less than a pressure threshold of the first pressure sensor.

In some embodiments, the first and/or second enclosure is an explosion-proof enclosure, the explosion-proof enclosure comprising:

a box body;

the explosion-proof cover is arranged on the box body, and the explosion-proof cover is connected with the box body through a bolt.

In some embodiments, the first box and the second box are electrically connected through a first lead device, so that the battery module and the power supply control module are electrically connected;

and a second lead device is arranged on the second box body so that the power supply control module is electrically connected with an external circuit.

In some embodiments, a free space exists between the potting layer covering the battery module and the explosion-proof cover.

In some embodiments, a first support member disposed in the first case, the first support member being configured to support and fix the battery module;

and the second supporting piece is arranged in the second box body and is used for supporting and fixing the power supply control module.

In some embodiments, the first potting layer, the second potting layer and the third potting layer fill the space between the battery module and the side wall and the bottom of the first case so as to be closely attached to the explosion-proof case body and fix the battery module.

This application can be through setting up pressure relief device between first box and second box and on the second box respectively, forms the second grade and releases to through releasing the pressure that effectively reduces battery module gas outgoing and produce step by step when battery takes place trouble such as thermal runaway and leads to the relief valve to open, prevent to destroy the casing of last one deck level, more can not cause explosive extreme harm to the external environment.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural view of an explosion-proof battery according to a first embodiment of the present invention;

fig. 2 is a schematic structural view of an explosion-proof battery according to a second embodiment of the present invention;

fig. 3 is a schematic structural view of an explosion-proof battery according to a third embodiment of the present invention;

fig. 4 is a schematic structural view of an explosion-proof battery according to a fourth embodiment of the present invention;

fig. 5 is a schematic structural view of an explosion-proof battery according to a fifth embodiment of the present invention;

fig. 6 is a schematic structural view of an explosion-proof battery according to a sixth embodiment of the present invention;

fig. 7 is a schematic structural view of an explosion-proof battery according to a seventh embodiment of the present invention;

reference numerals:

the explosion-proof battery 1, the box body 101 and the explosion-proof cover 102;

the battery module comprises a first box body 10, a first pouring seal layer 11, a second pouring seal layer 12, a third pouring seal layer 13, a battery module 30, an electrode 31, a pressure release valve 32, a first support 33 and a first pressure sensor 71;

the second box 20, the first lead device 21, the second lead device 22, the power control module 40, the second support 41, the first pressure relief device 50, the second pressure relief device 60, and the second pressure sensor 72.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

The explosion-proof battery according to an embodiment of the present invention is described below with reference to the accompanying drawings.

Fig. 1 is a schematic structural view of an explosion-proof battery according to a first embodiment of the present invention. As shown in fig. 1, the explosion-proof battery 1 in the embodiment of the present invention includes: the battery pack comprises a first box 10, a second box 20, a battery module 30 power control module 40, a first pressure relief device 50 and a second pressure relief device 60.

The battery module 30 is disposed in the first casing 10, the battery module 30 includes a first region and a second region, the first region includes all the electrodes 31 in the battery module 30, and the second region includes all the pressure relief valves 32 in the battery module 30.

It should be understood that the battery module 30 may be formed by connecting single lithium batteries in series or in parallel, each single lithium battery has a positive electrode 31 and a negative electrode 31, when N single lithium batteries are disposed in the battery module 30, there are N × 2 electrodes 31, where N is an integer greater than 1, and in this case, the first region includes all the electrodes 31 in the battery module 30. Similarly, the second region includes all the pressure relief valves 32 in the battery module 30.

It should be noted that battery explosion generally refers to a failure such as thermal runaway occurring in a lithium battery, which causes a sudden increase in the internal pressure of the battery until the battery case is burst and exploded. Therefore, the large-capacity lithium battery is provided with the pressure release valve, so that when the gas pressure in the battery reaches the preset threshold value of the pressure release valve, the gas in the battery can be released to the outside of the battery by opening the pressure release valve, and the explosion of the battery is effectively avoided.

The power control module 40 is disposed in the second housing 20.

The power control module 40 is electrically connected to the battery module 30, and the battery control module 40 is used for controlling and monitoring the charging and discharging states of the battery module 30.

Specifically, as shown in fig. 2, the first case 10 and the second case 20 are electrically connected to each other through the first lead device 21 so that the battery module 30 is electrically connected to the power control module 40. For example, the electric control wire between the power control module 40 and the battery module 30 passes through the case between the first case 10 and the second case 20 through the first lead device 21.

It should be understood that the second casing 20 may be further provided with a second lead device 22 communicating with the outside so as to electrically connect the power control module 40 with an external circuit, wherein the external circuit may be a control circuit of the electric equipment, so that the power control module 40 can control the charging and discharging of the battery module 30 according to the demand of the electric power.

Wherein the first and second lead means 21, 22 may consist of one or more glan heads.

The first pressure relief device 50 is disposed between the first tank 10 and the second tank 20, and is used to relieve the pressure in the first tank 10 to the second tank 20.

The second pressure relief device 60 is provided on the second tank 20 for relieving pressure in the second tank 20 to the outside.

Further, although the battery module 30 discharges the gas generated inside to the outside of the battery module 30 through the relief valve 32, since the first case 10 is a sealed structure, the gas pressure inside the first case 10 gradually increases as the gas of the battery module 30 continuously increases, which may cause an explosion risk. Therefore, the first pressure relief device 50 is further arranged between the first box 10 and the second box 20 in the embodiment of the application, so that the pressure in the first box 10 can be relieved into the second box 20, and the risk of explosion of the first box 10 is effectively reduced. Meanwhile, the buffer space formed by the second box body 20 effectively reduces the pressure of the gas to be discharged and reduces the overall explosion danger of the explosion-proof battery.

Further, this application still sets up second pressure relief device 60 among second box 20 for the gas that battery module 30 produced can finally be released to the outside of explosion-proof battery 1 through second relief valve 60, promptly, makes the gas that battery module 30 produced loop through pressure relief valve 32, first pressure relief device 50 and the outside that explosion-proof battery finally discharged to second pressure relief device 60, effectively prevents explosion-proof battery.

From this, this application forms the second grade through setting up pressure relief device between first box and second box and on the second box respectively and releases to through releasing effectively reducing the casing of battery module 30 gas outgoing's pressure destruction last level step by step, can not cause explosive extreme harm to the external environment more.

Wherein, in the present embodiment, the first pressure relief device 50 and the second pressure relief device 60 may be a valve block consisting of one or more check valves and/or flame arresters.

Further, as shown in fig. 3, the explosion-proof battery 1 further includes a first potting layer 11 and a second potting layer 12.

The first potting layer 11 is used to cover a first area of the battery module 30, and the first potting layer 11 has a first opening corresponding to the pressure release valve 32, so that the pressure release valve 32 can release air through the first opening.

It should be noted that, since the potential ignition source in the battery is an electrified component, that is, the electrode 31 in the battery module 30, the first area of the battery module 30 is covered by the first potting layer 11, that is, all the electrodes 31 in the battery module 30 are isolated from the gas outside the battery module 30 by the first potting layer 11, so that the electrodes 31 in the battery module 30 are effectively prevented from generating electric sparks to ignite the explosive gas in the surrounding environment, thereby causing an explosive hazard.

The second potting layer 12 covers at least a second region of the battery module 30, wherein the impact strength of the second potting layer 12 is smaller than the impact strength of the pressure release valve when the pressure release valve is opened, so that the pressure release valve 32 breaks the second potting layer when the pressure release valve is opened.

That is to say, this application still protects all relief valves 32 in battery module 30 through second encapsulation layer 12 to prevent that relief valve 32 from being broken through by the outside power that comes from battery module 30, thereby influence the pressure environment of battery module 30 inside, cause the battery blasting, effectively improve battery module's reliability.

Meanwhile, the second pouring sealing layer 12 and the pressure release valve 32 can be broken by the gas generated inside the battery module 30, that is, the second pouring sealing layer 12 and the pressure release valve 32 can be broken when the pressure inside the battery module 30 sharply increases, so that the gas inside the battery module 30 is released to the outside of the battery module 30, the gas inside the battery module 30 is prevented from continuously increasing, and explosion is caused.

Alternatively, the second potting layer 12 may cover the first region in order to further isolate the electrodes 31 in the battery module 30.

The impact strength of the second potting layer 12 is less than that of the first potting layer 11, so that the second potting layer 12 can be easily broken by gas inside the battery module 30, and the purpose of gas release is achieved.

In some embodiments, as shown in fig. 3, the explosion-proof battery 1 further comprises a third potting layer 13, wherein the third potting layer 13 covers the second potting layer 12.

The third pouring layer 13 is provided with a second opening at the pressure release valve 32, the second opening corresponds to the pressure release valve 32, so that the pressure release valve 32 can exhaust gas through the second opening, the impact strength of the third pouring layer 13 is greater than that of the first pouring layer 11, and the first pouring layer 11, the second pouring layer 12 and the third pouring layer 13 are made of silica gel or epoxy resin.

That is to say, this application can effectively restrict the destruction degree to second encapsulation layer 12 when relief valve 32 is opened through setting up third encapsulation layer 13 in the outside of second encapsulation layer 12, promptly, makes the destruction part can be restricted in relief valve department by the at utmost, effectively reduces the destruction influence to first encapsulation layer 11, has improved the reliability of encapsulation protection. Moreover, the manufacturing process of the pouring layer can be simplified by adopting the silica gel or the epoxy resin, a better pouring protection effect can be ensured, and the method has better practicability and applicability.

Further, the first pouring layer 11, the second pouring layer 12 and the third pouring layer 13 are filled in the space between the battery module 30 and the side wall and the bottom of the first case 10, so that the battery module is tightly attached to the explosion-proof case body and fixes the battery module 30, and the battery module is prevented from colliding when the explosion-proof battery 1 is moved, and thus unnecessary reactions occur inside the battery module 30.

Further, as shown in fig. 4, the explosion-proof battery 1 further includes a first pressure sensor 71 and a second pressure sensor 72.

Wherein the first pressure sensor 71 is disposed in the first tank 10, the second pressure sensor 72 is disposed in the second tank 30, and a pressure threshold of the second pressure sensor 72 is smaller than that of the first pressure sensor 71.

Specifically, because the pressure threshold value of second pressure sensor 72 is less than the pressure threshold value of first pressure sensor 71, consequently, make gas enter into second box 20 through first pressure relief device 50, receive the pressure after the buffering decompression of second box 20, still can reach the pressure threshold value that triggers second pressure sensor 72, improve pressure detection's accuracy nature, when guaranteeing that box internal pressure risees, power control module group can in time cut off the connection between explosion-proof battery and the external circuit, in time relieve pressure to box internal pressure simultaneously, reduce explosion potential hazard of explosion-proof battery in the at utmost.

In some embodiments, as shown in fig. 5, the first case 10 and/or the second case 20 is an explosion-proof case including: a case body 101 and an explosion-proof cover 102.

Wherein, explosion-proof cover 102 sets up on box body 101, and explosion-proof cover 102 links to each other with box body 101 through the bolt to in time change and maintain battery module 30, practice thrift manufacturing cost.

Further, as shown in fig. 6, a free space 14 exists between the pouring layer covering the battery module 30 and the explosion-proof cover to provide a buffer area for the generated gas after the pressure release valve 32 is opened, so as to avoid causing an explosive accident to the explosion-proof box body.

Further, as shown in fig. 7, the explosion-proof battery 1 further includes a first support member 33 provided in the first case 10, the first support member 33 being used to support and fix the battery module 30, a second support member 41 provided in the second case 20, the second support member 41 being used to support and fix the power control module 40.

To sum up, the explosion-proof battery of this application embodiment, this application can cover the electrode of battery module through first seal and the second seal of watering, effectively realize the isolation to the electrode, avoid battery module electrode and ambient gas to produce the electric spark and take place the spontaneous combustion, simultaneously, this application is through setting up pressure relief device between first box and second box and on the second box respectively, form the second grade and release, in order to destroy the casing of last level through the pressure that releases effectively reducing battery module 30 gas outgoing step by step, can more not cause explosive extreme harm to the external environment.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

Claims

1. An explosion-proof battery, comprising:

a first box and a second box;

the power supply control module is arranged in the second box body;

2. The explosion-proof battery as set forth in claim 1, wherein said second region includes all pressure relief valves in said battery module.

3. The explosion-proof battery as defined in claim 2, further comprising:

the first pouring layer covers the first area of the battery module, and is provided with a first opening corresponding to the pressure release valve, so that the pressure release valve can exhaust gas through the first opening; and

4. The explosion-proof battery of claim 3 wherein the second potting layer also covers the first region and the second potting layer has a lower impact strength than the first potting layer.

5. The explosion-proof battery as defined in claim 4, further comprising:

cover the third of second pouring seal layer waters the seal, wherein, the third is watered the seal and is in relief valve position department has the second opening, the second opening corresponds the relief valve, so that the relief valve can warp the second opening is carminative, the impact strength who waters the seal of third is greater than the impact strength who waters the seal, first water the seal the second water the seal with the third waters the seal and is silica gel or epoxy.

6. The explosion-proof battery as defined in claim 1, further comprising:

a first pressure sensor disposed in the first tank;

7. The explosion-proof battery as defined in claim 5, wherein the first case and/or the second case is an explosion-proof case, the explosion-proof case comprising:

a box body;

8. The explosion-proof battery as defined in claim 1, further comprising:

the first box body and the second box body are electrically connected through a first lead device, so that the battery module is electrically connected with the power supply control module;

9. The explosion-proof battery as defined in claim 1, further comprising:

the first supporting piece is arranged in the first box body and used for supporting and fixing the battery module;

10. The explosion-proof battery as claimed in claim 7, wherein the first potting layer, the second potting layer and the third potting layer fill the space between the battery module and the side wall and the bottom of the first case so as to be closely attached to the explosion-proof case body and fix the battery module.