CN115395172A

CN115395172A - Energy storage device

Info

Publication number: CN115395172A
Application number: CN202210993584.1A
Authority: CN
Inventors: 秦宝峰; 黄英雄
Original assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2022-08-18
Filing date: 2022-08-18
Publication date: 2022-11-25

Abstract

The invention discloses an energy storage device, which comprises: the battery cluster is positioned in the box body, a battery inserting box is mounted on the battery cluster and comprises a shell, and the shell is a closed shell; and the battery module is positioned in the shell. The vacuumizing assembly is connected with the shell and used for enabling the interior of the shell to be in a certain vacuum degree. Among the above-mentioned energy storage equipment, the evacuation subassembly can make the casing inside of battery subrack be in certain vacuum, reduces the interior oxygen content of casing, and real-time protection battery subrack reduces the battery subrack because the local fire that leads to that generates heat and conflagration takes place.

Description

Energy storage device

Technical Field

The invention relates to the technical field of electric energy storage, in particular to energy storage equipment.

Background

Currently, energy storage containers have a fire protection system equipped with a smoke sensor, when the smoke sensor detects a smoke signal, a fire protection controller sends an alarm signal, while a valve is actuated to release gas into the container to extinguish the fire. However, the existing fire fighting system generally starts to operate when the sensor senses smoke, can only inhibit the spread of fire, cannot inhibit the occurrence of fire, and can protect in advance and protect in real time.

Disclosure of Invention

The embodiment of the invention provides energy storage equipment.

An energy storage device according to an embodiment of the present invention includes:

a box body;

the battery cluster is located in the box, install the battery subrack on the battery cluster, the battery subrack includes:

a housing, which is a hermetic housing;

a battery module positioned in the housing,

and the vacuumizing assembly is connected with the shell and is used for keeping the interior of the shell at a certain vacuum degree.

Among the above-mentioned energy storage equipment, the evacuation subassembly can make the casing inside of battery subrack be in certain vacuum, reduces casing oxygen content, accomplishes protection in advance, real-time protection battery subrack, reduces the battery subrack because the local fire that leads to that generates heat and the conflagration breaks out.

In some embodiments, the box body is provided with a plurality of battery clusters, and the vacuum pumping assembly comprises a vacuum pump and a first flow regulating valve, wherein the vacuum pump is connected with the shell through the first flow regulating valve.

In some embodiments, each battery cluster is provided with a plurality of battery sockets, and a plurality of housings on each battery cluster are connected with the vacuum pump through one first flow regulating valve.

In some embodiments, the evacuation assembly further comprises a plurality of second flow control valves, and the first flow control valve is connected to a corresponding one of the housings through each of the second flow control valves.

In some embodiments, the evacuation assembly further comprises a plurality of check valves, each of the second flow control valves is connected to a corresponding one of the housings through one of the check valves, and the check valves are configured to block gas flowing into the housings.

In certain embodiments, the evacuation assembly further comprises a plurality of vacuum sensors, each of the vacuum sensors connecting a conduit between each of the one-way valves and each of the housings.

In some embodiments, the vacuum pumping assembly includes a controller, a vacuum pump, and a vacuum sensor, the controller is connected to the vacuum pump and the vacuum sensor, the vacuum sensor is configured to detect a vacuum degree in the housing, and when the vacuum degree in the housing is greater than a set value, the controller is configured to control the vacuum pump to start pumping the housing until the vacuum degree in the housing is less than or equal to the set value.

In some embodiments, the energy storage device further comprises a smoke sensor and a gas releasing assembly, the smoke sensor is connected to the gas releasing assembly, the smoke sensor is configured to detect a smoke signal in the box, and the gas releasing assembly is configured to release gas into the box when the smoke signal is present.

In some embodiments, the evacuation assembly is configured to adjust a vacuum level within the housing based on a level of the smoke signal.

In some embodiments, a high-voltage box is installed on the battery cluster, and the vacuum-pumping assembly is connected with the high-voltage box and used for enabling the inside of the high-voltage box to be in a certain vacuum degree.

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

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is also possible for those skilled in the art to obtain other drawings based on the structures shown in the drawings without creative efforts.

FIG. 1 is a block schematic diagram of an energy storage device according to an embodiment of the invention;

FIG. 2 is a schematic diagram of another module of an energy storage device according to an embodiment of the invention;

fig. 3 is a schematic diagram of the connection of a battery cluster to a vacuum evacuation assembly in accordance with an embodiment of the present invention.

Description of reference numerals:

the device comprises an energy storage device-100, a box body-12, a battery cluster-14, a vacuumizing assembly-16, a shell-20, a high-pressure box-21, a battery module-22, a vacuum pump-24, a first flow regulating valve-26, a second flow regulating valve-28, a one-way valve-30, a vacuum sensor-32, a controller-34, a smoke sensor-36, a gas releasing assembly-38 and a third flow regulating valve-40.

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 or similar 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 accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. 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 one or more features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, a detachable connection, or an integral connection unless otherwise specifically stated or limited. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present invention. Moreover, the present invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

Referring to fig. 1 to 3, an energy storage apparatus 100 according to an embodiment of the present invention includes a box 12, a battery cluster 14, and a vacuum assembly 16. The battery cluster 14 is located in the box body 12, a battery inserting box 18 is installed on the battery cluster 14, and the battery inserting box 18 comprises a shell 20 and a battery module 22. The case 20 is a hermetic case 20, and the battery module 22 is located inside the case 20. The vacuum pumping assembly 16 is connected to the housing 20, and the vacuum pumping assembly 16 is used for maintaining a certain vacuum degree in the housing 20.

In the energy storage device 100, the vacuumizing assembly 16 can make the interior of the shell 20 of the battery plug box 18 in a certain vacuum degree, so that the oxygen content in the shell 20 is reduced, the battery plug box 18 is protected in advance and protected in real time, and the occurrence of fire caused by fire due to local heating of the battery plug box 18 is reduced.

Specifically, the housing 12 may be formed in the form of a container, or other form, and is not particularly limited thereto. The case 12 may be placed outdoors or indoors, and the energy storage device 100 may store electric energy generated by the solar cell.

One or more (e.g., two or more) battery clusters 14 may be disposed within the housing 12, and the plurality of battery clusters 14 may be disposed in an m x n array within the housing 12. Each battery cluster 14 may have a plurality of battery sockets 18 mounted thereon, and specifically, the battery cluster 14 may have a plurality of mounting grids arranged in an array, each mounting grid has one battery socket 18 mounted thereon, and the plurality of battery sockets 18 are connected in series, in parallel, or in series-parallel. Referring to fig. 3, each battery cluster 14 is further provided with a high voltage box 21, the high voltage box 21 is connected to the battery box 18, the high voltage box 21 has an output port and an input port, and the battery box 18 can be charged or discharged through the high voltage box 21.

One or more battery modules 22 may be mounted in the housing 20, and a plurality of battery modules 22 may be connected in series, in parallel, or in series-parallel. Each battery module 22 may include a plurality of battery cells, and the plurality of battery cells may be connected in series, in parallel, or in series and parallel. The single cell may be a square cell or a cylindrical cell, and is not limited specifically herein.

The housing 20 is a hermetic housing 20. In one embodiment, the battery box 18 may be a liquid-cooled battery box 18, where the liquid-cooled battery box 18 is relatively airtight. It is understood that in other embodiments, the battery compartment 18 may also be other types of battery compartments 18.

The evacuation assembly 16 may maintain the interior of the housing 20 at a vacuum level such that fire protection is refined to each battery compartment 18 rather than the housing 12 of the energy storage device 100. The shell 20 is kept at a certain vacuum degree, so that the oxygen content can be reduced, the battery plug box 18 is protected in real time, and the fire caused by local heating (battery core, aluminum bar welding position and the like) of the battery plug box 18 is reduced.

In some embodiments, a plurality of battery clusters 14 are disposed within the housing 12, and the evacuation assembly 16 includes a vacuum pump 24 and a first flow control valve 26, the vacuum pump 24 being coupled to the housing 20 through the first flow control valve 26. In this way, the first flow regulating valve 26 can flexibly control the battery pack 14 to be vacuumized.

Specifically, in the illustrated embodiment, there are 10 battery clusters 14 within the housing 12, the 10 battery clusters 14 are arranged in a 2 x 5 array, and the vacuum pump 24 may be connected to the housing 20 of a corresponding one of the battery clusters 14 via a first flow regulating valve 26. When it is desired to evacuate the housing 20 of a certain cell cluster 14, the first flow control valve 26 connected to that cell cluster 14 may be opened, while the first flow control valves 26 of other cell clusters 14 are closed. When the vacuum pump 24 works, the casing 20 on the battery cluster 14 corresponding to the opened state of the first flow control valve 26 can be vacuumized, and when the vacuum degree in the casing 20 reaches the set vacuum degree, the first flow control valve 26 can be closed, and then the inside of the casing 20 on the next battery cluster 14 is vacuumized.

The vacuum pump 24 may be connected to a first flow regulating valve 26 through a pipe, and the first flow regulating valve 26 may be connected to the housing 20 through a pipe. In the embodiment shown in FIG. 1, the vacuum pump 24 is located outside the enclosure 12. It is understood that in other embodiments, the vacuum pump 24 may be located within the tank 12.

It is understood that in other embodiments, the number of the battery clusters 14 in each box 12 can be set according to the requirement, and the arrangement form is not limited to the above form.

In certain embodiments, a plurality of battery receptacles 18 are mounted to each battery cluster 14, and a plurality of housings 20 on each battery cluster 14 are connected to a vacuum pump 24 via a first flow control valve 26. In this manner, the energy storage capacity of each battery cluster 14 may be increased.

Specifically, each battery cluster 14 may be provided with a plurality of mounting lattices, each battery box 18 may be mounted in a corresponding one of the mounting lattices, and the battery modules 22 of the plurality of battery boxes 18 may be connected in series, in parallel, or in series-parallel. A plurality of battery sockets 18 are mounted on one battery cluster 14, which can significantly improve the energy storage capacity of each battery cluster 14.

In this embodiment, during the evacuation, all of the cases 20 of one battery cluster 14 may be evacuated.

In certain embodiments, the evacuation assembly 16 further includes a plurality of second flow control valves 28, and the first flow control valve 26 is coupled to a corresponding one of the housings 20 through each of the second flow control valves 28. In this way, the housing 20 to be evacuated can be flexibly controlled by the second flow control valve 28.

Specifically, in the embodiment shown in fig. 3, 8 rows of battery sockets 18 are mounted on each battery cluster 14 in the height direction, and the number of battery sockets 18 per row of battery sockets 18 can be set as desired. The bottom of the battery cluster 14 is also provided with a high voltage box 21. A first flow control valve 26 may be connected to the respective housing 20 via a second flow control valve 28. When a vacuum needs to be drawn from one of the casings 20, the first flow control valve 26 and the corresponding one of the second flow control valves 28 of the battery cluster 14 may be opened, while the other second flow control valves 28 are closed. When the vacuum pump 24 is in operation, the casing 20 corresponding to the open state of the first flow control valve 26 and the second flow control valve 28 may be evacuated, and when the vacuum degree inside the casing 20 reaches a set vacuum degree, the second flow control valve 28 may be closed, and then the inside of the next casing 20 on the battery cluster 14 may be evacuated.

The vacuum level inside the housing 20 of different battery boxes 18 may be the same, different, or partially the same or different, and is not limited in detail.

The first flow control valve 26 may be connected to a second flow control valve 28 by tubing, and the second flow control valve 28 may be connected to the housing 20 by tubing.

It is understood that in other embodiments, the number of battery sockets 18 mounted on each battery cluster 14 can be set according to requirements, and the arrangement form is not limited to the above form.

In some embodiments, the evacuation assembly 16 further includes a plurality of check valves 30, each of the second flow control valves 28 is connected to a corresponding one of the housings 20 by a check valve 30, and the check valves 30 block gas flow into the housings 20. Thus, the inside of the housing 20 can be maintained at a certain vacuum degree, and energy can be saved.

Specifically, the check valve 30 blocks the gas flowing into the housing 20, and the check valve 30 conducts the gas flowing out of the housing 20. When a vacuum is applied to a certain housing 20, the check valve 30 conducts gas flowing out of the housing 20. When the interior of the casing 20 is in a certain vacuum degree, the vacuum pump 24 is turned off, and the check valve 30 stops the gas flowing into the casing 20, so that the interior of the casing 20 is kept in a certain vacuum degree state, and the vacuum pump 24 is not required to be in a continuous operation state, thereby saving energy. The check valve 30 may connect the second flow control valve 28 and the housing 20 through a pipe.

In certain embodiments, the evacuation assembly 16 further includes a plurality of vacuum sensors 32, each vacuum sensor 32 connecting tubing between each one-way valve 30 and each housing 20. In this manner, the degree of vacuum detection accuracy in the housing 20 can be ensured.

Specifically, every vacuum sensor 32 connects the pipeline between every check valve 30 and every casing 20, and on the one hand, vacuum sensor 32 passes through the pipeline and the inside intercommunication of casing 20, can real-time detection casing 20 in the vacuum degree, and on the other hand, vacuum sensor 32 is closer to casing 20 than check valve 30 and second flow control valve 28 for the vacuum degree error that vacuum sensor 32 detected is less, more can reflect the vacuum degree size in the casing 20, guarantees the vacuum degree detection accuracy in the casing 20, and then promotes the control degree of accuracy.

In some embodiments, referring to fig. 2, the vacuum pumping assembly 16 includes a controller 34, a vacuum pump 24 and a vacuum sensor 32, the controller 34 is connected to the vacuum pump 24 and the vacuum sensor 32, the vacuum sensor 32 is used for detecting a vacuum degree in the housing 20, and when the vacuum degree in the housing 20 is greater than a set value, the controller 34 is used for controlling the vacuum pump 24 to start pumping the housing 20 until the vacuum degree in the housing 20 is less than or equal to the set value. In this way, a certain degree of vacuum can be secured inside the housing 20.

Specifically, each of the housings 20 may be connected to one of the vacuum sensors 32 through a pipe, and the vacuum sensors 32 may detect the degree of vacuum inside each of the housings 20 in real time. The set value may be a preset vacuum level threshold. When the vacuum degree in the casing 20 fed back by one of the vacuum sensors 32 is greater than the set value, the controller 34 may control the vacuum pump 24 to start up to vacuumize the casing 20 until the vacuum degree in the casing 20 is less than or equal to the set value.

In the illustrated embodiment, a vacuum is applied to one of the casings 20 by controlling the first flow rate adjustment valve 26 and the second flow rate adjustment valve 28. It is understood that in other embodiments, one vacuum pump 24 may be connected to one housing 20 through a flow control valve, and one vacuum pump 24 may be used to independently evacuate one housing 20.

In some embodiments, referring to fig. 2, the energy storage device 100 further comprises a smoke sensor 36 and a gas releasing assembly 38, the smoke sensor 36 is connected to the gas releasing assembly 38, the smoke sensor 36 is used for detecting a smoke signal in the box 12, and the gas releasing assembly 38 is used for releasing gas into the box 12 when the smoke signal is present. Thus, the spread of fire can be suppressed.

Specifically, the smoke sensor 36 may be mounted within the housing 12, one or more smoke sensors 36 may be mounted within the housing 12, and multiple smoke sensors 36 may be separately mounted at different locations within the housing 12 to provide timely detection of smoke signals.

The gas discharge assembly 38 may receive the smoke signal from the smoke sensor 36, and in the presence of the smoke signal, the gas discharge assembly 38 may discharge gas into the enclosure 12 to suppress the spread of fire.

The gas release assembly 38 may include a control circuit connecting the smoke sensor 36 and a gas valve, a gas canister, and a gas valve connecting the gas canister and the tank 12 via a conduit. And when no smoke signal exists, the gas valve is in a normally closed state. In the presence of a smoke signal, the control circuit may control the gas valve to open to allow gas from the tank to pass into the tank 12 to inhibit the spread of a fire.

In some embodiments, the evacuation assembly 16 is configured to adjust the level of vacuum within the housing 20 based on the level of the smoke signal. Thus, the spread of fire can be further prevented.

In particular, the severity of fire is generally positively correlated with smoke size. The size of the parameters of the smoke signals can be classified into different grades in advance, the larger the parameter of the smoke signals is, the higher the smoke concentration is or more smoke is indicated, and the higher the grade of the smoke signals is, the different grades can correspond to different required vacuum degrees. Each level may correspond to a range of parameters of the smoke signal.

When the smoke signal detected in real time is within a certain parameter range, the level of the smoke signal can be determined, and then the corresponding required vacuum degree can be determined, and when the vacuum degree in the shell 20 is different from the required vacuum degree or the difference between the vacuum degree and the required vacuum degree is out of a certain range, the vacuum pumping assembly 16 can adjust the vacuum degree in the shell 20 to meet the required vacuum degree. For example, when the vacuum level in one or more of the shells 20 is greater than the required vacuum level, the controller 34 may control the vacuum pump 24 to start, and open the corresponding flow regulating valve to perform the vacuum pumping operation on one or more of the shells 20. When the vacuum degree in the shell 20 is less than the required vacuum degree, the controller 34 may control the corresponding flow regulating valve to open, so that one or more shells 20 perform the air intake operation.

In some embodiments, referring to fig. 3, a high voltage box 21 is installed on the battery cluster 14, and the vacuum pumping assembly 16 is connected to the high voltage box 21, and the vacuum pumping assembly 16 is used for maintaining a certain vacuum degree inside the high voltage box 21. In this way, the high voltage cartridge 21 can also be protected.

Specifically, the high voltage box 21 may connect a plurality of battery boxes 18 to form a circuit in series, parallel, or series-parallel, and the high voltage box 21 is provided with an output port that may discharge the battery boxes 18 outward and an input port that may charge the battery boxes 18.

The high-pressure box 21 is provided with a closed box body, the vacuum pump 24 can be connected with the box body through a pipeline, and when the vacuum pump 24 is started, the inside of the high-pressure box 21 can be in a certain vacuum degree.

In the illustrated embodiment, each cell cluster 14 has one high-pressure cartridge 21, and the vacuum pump 24 is connected to the high-pressure cartridge 21 through the first flow rate adjustment valve 26, the third flow rate adjustment valve 40, and the check valve 30 in this order. When the high-pressure cartridge 21 needs to be vacuumized, the corresponding first flow rate adjustment valve 26 and third flow rate adjustment valve 40 may be opened, the vacuum pump 24 may be started, and the cartridge may be vacuumized. When the vacuum degree inside the case reaches a set value, the vacuum pump 24 is turned off. It will be appreciated that the amount of vacuum within the interior of the high pressure cartridge 21 may be the same or different than the amount of vacuum within the housing 20 of the battery compartment 18.

The evacuation module 16 according to the embodiment of the present invention can adjust the opening degree of the flow rate adjustment valve.

In summary, the energy storage device 100 according to the embodiment of the present invention can achieve at least the following technical effects:

1. refined to each battery plug box 18, and can quickly extinguish fire when a fire disaster happens;

2. protecting in real time and inhibiting the fire occurrence probability;

3. the fire-fighting protection device can be used with the current gas fire-fighting system according to the fire grade to realize double protection;

4. arcing caused by on-off of the electrical elements can be effectively inhibited, and the probability of fire occurrence is reduced.

In the description of the present specification, reference to the description of the terms "one embodiment", "some embodiments", "an illustrative embodiment", "an example", "a specific example", or "some examples", etc., means 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 present invention. In this specification, schematic representations of the above terms do not necessarily 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.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An energy storage device, comprising:

a box body;

a housing, which is a hermetic housing;

a battery module positioned in the housing,

and the vacuumizing assembly is connected with the shell and is used for ensuring that the inside of the shell is in a certain vacuum degree.

2. The energy storage device of claim 1, wherein a plurality of the battery clusters are disposed within the tank, and wherein the evacuation assembly comprises a vacuum pump and a first flow regulating valve, the vacuum pump being coupled to the housing through the first flow regulating valve.

3. The energy storage device of claim 2, wherein a plurality of battery sockets are mounted on each battery cluster, and a plurality of housings on each battery cluster are connected to the vacuum pump through one of the first flow regulating valves.

4. The energy storage device of claim 3, wherein said evacuation assembly further comprises a plurality of second flow control valves, said first flow control valve being coupled to a corresponding one of said housings through each of said second flow control valves.

5. The energy storage device of claim 4, wherein the evacuation assembly further comprises a plurality of one-way valves, each of the second flow control valves being connected to a corresponding one of the housings through one of the one-way valves, the one-way valves blocking gas flow into the housings.

6. The energy storage device of claim 5, wherein the evacuation assembly further comprises a plurality of vacuum sensors, each of the vacuum sensors connecting a conduit between each of the one-way valves and each of the housings.

7. The energy storage device of claim 1, wherein the evacuation assembly comprises a controller, a vacuum pump and a vacuum sensor, the controller is connected to the vacuum pump and the vacuum sensor, the vacuum sensor is configured to detect a vacuum degree in the housing, and when the vacuum degree in the housing is greater than a set value, the controller is configured to control the vacuum pump to start evacuating the housing until the vacuum degree in the housing is less than or equal to the set value.

8. The energy storage device of claim 1, further comprising a smoke sensor coupled to the gas release assembly, the smoke sensor configured to detect a smoke signal within the tank, and a gas release assembly configured to release gas into the tank in the presence of the smoke signal.

9. The energy storage device of claim 8, wherein the evacuation assembly is configured to adjust a vacuum level within the housing based on a level of the smoke signal.

10. The energy storage device of claim 1, wherein a high voltage box is mounted on the battery cluster, and the vacuum pumping assembly is connected to the high voltage box and used for enabling the inside of the high voltage box to be in a certain vacuum degree.