Battery can and explosion venting method for large energy storage systems

Abstract

The application relates to a battery tank and a method for explosion relief of a large energy storage system, which comprises a shell, a partition plate, a bottom plate, a lithium battery module, an electrical cavity and a cooling fire-fighting cavity. The electrical cavity and the cooling fire-fighting cavity are separated by the partition plate, and the lithium battery is hung on the partition plate by means of self-gravity through a sealing connecting device. The cooling fire-fighting cavity contains cooling fire-fighting liquid, and the lithium battery module is soaked in the cooling fire-fighting liquid. The lithium battery module comprises an upper cover, an outer shell, a battery cell and a lower cover. The battery cell is provided with a first explosion relief unit, the lower cover is provided with a second explosion relief unit at the center position, and the bottom plate is provided with an explosion relief channel between the second explosion relief unit. When thermal runaway occurs in the lithium battery module, the second explosion relief unit will be broken, so that the cooling fire-fighting liquid enters the lithium battery module by means of static pressure, and the effect of cooling, pressure relief, termination of thermal runaway and thermal runaway spread is achieved by means of non-active means.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of batteries, in particular to a battery tank and a method for relieving explosion for large-scale energy storage system. BACKGROUND

[0002] In recent years, lithium battery technology has developed rapidly and has been used in more and more fields. However, due to the principle and structural characteristics of lithium batteries, a large amount of heat is generated during repeated use due to internal resistance heating, and the heat will gradually increase. The temperature further rises, and the electrolyte and solvent inside will decompose, burn and explode.

[0003] The traditional heat dissipation system mainly adopts forced ventilation, water cooling and natural convection heat dissipation, all of which have certain application defects: forced ventilation and water cooling have a large and complex structure due to the need for fans, pumps, pipelines and other accessories. In addition, air cooling will affect the sealing of the lithium battery module package, and water cooling has a high cost and water and water vapor can easily cause short circuits, which requires corresponding insulation and sealing treatment. The natural convection heat dissipation has very limited heat dissipation effect in the case of poor air convection.

[0004] CN112421159A discloses a high-energy lithium battery and a large-scale energy storage system comprising the lithium battery. The lithium battery is immersed in a heat-conducting liquid, and when thermal runaway occurs, the explosion relief component breaks, causing the flammable material in the battery to be quickly guided into the fire-fighting cavity. The lithium battery module of the present application allows the cooling fire-fighting liquid to enter the interior of the lithium battery module under the action of static pressure after the explosion relief component breaks, thereby terminating thermal runaway and thermal runaway spread in a passive manner. In addition, the present application uses the self-gravity of the lithium battery module to strengthen the sealing, and uses a wedge-shaped sealing connector to strengthen the sealing effect, which can effectively prevent water and water vapor from entering the electrical cavity and causing the risk of short circuit.

[0005] CN207052730U, CN103985921A, CN106505277A and CN202550023U all use the water bath principle for heat dissipation, but all of them set up explosion relief devices and do not have the technology to strengthen the sealing. In the technical solution of CN103985921A, when the battery experiences thermal instability, the pressurizer pressurizes the system to break the cooling pipe, and the cooling liquid in the cooling pipe is sprayed onto the battery, which adopts an active way to prevent battery thermal instability. In contrast, the passive way adopted by the present application can save more energy and has a simpler structure; CN106505277A sets up sealing glue and sealing rings to strengthen the sealing, while the present application uses the self-gravity of the lithium battery module to achieve the purpose of sealing, and sets up a wedge-shaped sealing connector, so that the sealing structure is more excellent and the effect is better. SUMMARY

[0006] An object of the present application is to solve at least the above problems and / or defects, and to provide at least the advantages to be described later.

[0007] The application provides a battery tank for a large energy storage system, comprising a shell, a partition plate, a bottom plate and a lithium battery module, wherein the battery tank is divided into a cooling and fire-fighting cavity and an electrical cavity by the partition plate, a plurality of holes are arranged on the partition plate and used for placing the lithium battery module, and the upper cover of the lithium battery module has a larger cross-sectional area than the cross-sectional area of the hole on the partition plate, so that the lithium battery module is sealed and hung on the partition plate under the action of its own gravity.

[0008] Further, in the application, the bottom plate is arranged below the battery tank, and a positioning device is arranged at a position corresponding to the lithium battery module, so that the lithium battery module is prevented from shaking and installation and transportation are facilitated.

[0009] Further, in the application, a wedge-shaped sealing connector is arranged at the connection position of the partition plate and the lithium battery module, so that the cooling and fire-fighting liquid is prevented from entering the electrical cavity and a good sealing effect is achieved.

[0010] Further, in the application, the wedge-shaped sealing connector is a circular ring with a larger upper radius than lower radius, and the cross section is a right-angle trapezoid.

[0011] Further, in the application, the hole is a circular hole, and the lithium battery module is a cylindrical battery module.

[0012] Further, in the application, the hole is a square hole, and the lithium battery module is a square battery module.

[0013] Further, in the application, the positive and negative electrodes of the lithium battery module are connected to the electrical cavity above the partition plate by wires.

[0014] The electrical cavity is provided with a control unit, and the control unit is one or more of a battery management system, a bus bar and an energy storage converter.

[0015] Further, in the application, the shell of the battery tank is electrically connected to the ground.

[0016] Further, in the application, the lithium battery module comprises a shell, an upper cover, a lower cover and at least one battery cell, and a first explosion venting unit is arranged on each battery cell.

[0017] Further, at least one pressure relief hole is arranged at the upper cover of the lithium battery module.

[0018] Further, in the application, the cooling fire-fighting cavity contains cooling fire-fighting liquid, the lower cover of the lithium battery module is provided with a second explosion venting unit, and the bottom plate and the second explosion venting unit are provided with an explosion venting channel. When thermal runaway occurs in the lithium battery module, the second explosion venting unit is broken, and the cooling fire-fighting liquid enters the lithium battery module through the explosion venting channel by static pressure, thereby achieving the effects of cooling, pressure relief, and termination of thermal runaway and thermal runaway spread by a passive means.

[0019] Further, in the application, the upper cover, the lower cover and the shell of the lithium battery module are made of aluminum alloy, or a metal material or a non-metal material with strength and corrosion resistance equivalent to that of aluminum alloy.

[0020] Further, in the application, when thermal runaway occurs, the second explosion venting unit is broken, and the cooling fire-fighting liquid absorbs heat or reacts with the electrolyte.

[0021] Further, in the application, the cooling fire-fighting liquid is water.

[0022] Further, in the application, the cooling fire-fighting cavity is connected to a cooling fire-fighting liquid circulating device through a water outlet pipe and a water return pipe.

[0023] Further, in the application, the cooling fire-fighting liquid circulating device is an industrial water chiller.

[0024] Further, in the application, the water outlet pipe is provided with a purification and filtration device.

[0025] Further, the application also provides an explosion venting method for a battery tank of a large-scale energy storage system. Each cell in the lithium battery module is provided with a first explosion venting unit, and a second explosion venting unit is arranged at the lower cover of the lithium battery module. When a cell generates thermal runaway, the first explosion venting unit on the cell is activated, and the generated substances of thermal runaway are buffered in the lithium battery module. When the pressure in the lithium battery module continuously rises to reach a pressure threshold, the second explosion venting unit at the lower cover of the lithium battery module is activated to open an explosion venting channel, so that the cooling fire-fighting liquid enters the lithium battery module and the cell generating thermal runaway through the explosion venting channel by static pressure.

[0026] Compared with the prior art, the application has the following beneficial effects:

[0027] 1. The battery tank for a large-scale energy storage system provided by the application realizes sealing under the action of the gravity of the lithium battery module, and the wedge-shaped sealing connector at the connection between the partition plate and the lithium battery module strengthens the sealing effect.

[0028] 2. The battery tank for a large-scale energy storage system provided by the application can immerse the lithium battery module in cooling liquid for liquid cooling and heat dissipation, and timely discharge the heat generated by the lithium battery module.

[0029] 3. The battery tank for large-scale energy storage system provided by the application has a large cross-sectional area of the explosion venting channel at the contact between the bottom plate and the second explosion venting unit, so that when thermal runaway occurs, the explosion venting gas can be smoothly discharged, and the fire-fighting liquid can also flow into the lithium battery module.

[0030] 4. The battery tank for large-scale energy storage system provided by the application has fire-fighting liquid in the fire-fighting cavity, and when thermal runaway occurs, the fire-fighting liquid can enter the lithium battery module through the explosion venting channel due to the rupture of the explosion venting component; without a circulating system, the fire-fighting liquid can still enter the lithium battery module through the explosion venting channel by means of hydrostatic pressure, thereby achieving the effects of cooling, pressure relief, and termination of thermal runaway and thermal runaway spread, and eliminating the risk of thermal runaway of the lithium battery module.

[0031] 5. The battery tank for large-scale energy storage system provided by the application has a first explosion venting unit on each cell in the lithium battery module and a second explosion venting unit at the lower cover of the lithium battery module; when thermal runaway occurs in a cell, the first explosion venting unit on the cell is activated, and the substances generated by thermal runaway are buffered in the lithium battery module, effectively preventing the impact of pressure on the battery module and the battery tank; when the pressure in the lithium battery module continues to rise to a pressure threshold, the second explosion venting unit at the lower cover of the lithium battery module is activated to open the explosion venting channel, so that the cooling fire-fighting liquid enters the lithium battery module and the cell with thermal runaway through the explosion venting channel by means of static pressure. The above-mentioned secondary explosion venting method can effectively improve the overall safety protection performance, control thermal runaway in the first time, and avoid the spread of thermal runaway and cause greater damage to adjacent battery modules or battery tanks.

[0032] Other advantages, objects, and features of the application will be apparent from the following description, and will be understood by those skilled in the art upon reading and understanding the application. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and those skilled in the art can also obtain other drawings according to these drawings without any creative effort.

[0034] Figure 1 Structure schematic diagram of the battery tank provided by the embodiment of the application.

[0035] Figure 2 Structure schematic diagram of the battery tank provided by the embodiment of the application.

[0036] Figure 3 Figure 3 is a structural schematic diagram of a battery tank according to an embodiment of the present application.

[0037] Figure 4 Figure 4 is a partial structural schematic diagram of a sealing portion of a battery tank according to an embodiment of the present application.

[0038] Figure 5 Figure 5 is another partial structural schematic diagram of a sealing portion of a battery tank according to an embodiment of the present application.

[0039] Figure 6 Figure 6 is a partial structural schematic diagram of a pressure relief portion of a battery tank according to an embodiment of the present application.

[0040] Figure 7 Figure 7 is a structural schematic diagram of a lithium battery module of a battery tank according to an embodiment of the present application.

[0041] Legend of reference signs:

[0042] 1 - shell, 2 - bottom plate, 3 - second pressure relief unit, 4 - lithium battery module, 5 - pressure relief channel, 6 - cooling fire-fighting liquid, 7 - partition plate, 8 - wedge-shaped sealing connector, 9 - electrical cavity, 10 - cooling fire-fighting cavity, 11 - return pipe, 12 - purification filter device, 13 - outlet pipe, 14 - positioning device, 15 - cooling fire-fighting liquid circulating device, 16 - upper cover, 17 - outer shell, 18 - battery cell, 19 - lower cover. DETAILED DESCRIPTION

[0043] The present application will be further described in detail below with reference to the accompanying drawings, so that those skilled in the art can implement the present application according to the description and drawings.

[0044] It should be understood that the terms such as "have", "contain" and "include" used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0045] The technical solutions of the present application will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0046] The battery tank for large-scale energy storage system provided by the embodiment of the present application comprises a shell, a partition plate, a bottom plate and a lithium battery module. The battery tank is divided into a cooling fire-fighting cavity and an electrical cavity by the partition plate. A plurality of holes are provided on the partition plate for placing the lithium battery module. The cross-sectional area of the upper cover of the lithium battery module is greater than the cross-sectional area of the hole, so that the lithium battery module is sealed and hung on the partition plate under the action of its own gravity.

[0047] Optionally, in the embodiment of the present application, Figure 1 , Figure 2As shown, the battery tank is divided into a cooling fire-fighting cavity 10 and an electrical cavity 9 by a partition 7, a plurality of holes are provided on the partition 7 for placing the lithium battery module 4, the cross-sectional area of the upper cover 16 of the lithium battery module is greater than the cross-sectional area of the hole, so that the lithium battery module 4 is sealed and hung on the partition under the action of its own gravity.

[0048] Optionally, in the embodiment of the present application, the partition 7 is connected with the lithium battery module 4 at a wedge-shaped sealing connector 8, the bottom plate 2 is arranged below the lithium battery module 4, and a positioning device 14 is arranged at a corresponding position of the lithium battery module 4, the wedge-shaped sealing connector 8 is a circular ring with a larger upper radius than a lower radius, and the cross section is a right trapezoid.

[0049] Optionally, in the embodiment of the present application, the lithium battery module 4 includes a shell 17, an upper cover 16, a lower cover 19, and at least one battery cell 18, and a first explosion relief unit is arranged on each battery cell. A second explosion relief unit 3 is arranged at the position of the lower cover of the lithium battery module 4. The bottom plate 2 and the second explosion relief unit 3 form an explosion relief channel 5.

[0050] When a single battery cell is in thermal runaway, the first explosion relief unit on the battery cell is started, the substances generated by the thermal runaway of the battery cell are discharged through the first explosion relief unit, and are buffered in the lithium battery module where the battery cell is located. After the battery cell is in thermal runaway, the design of buffering in the single battery module shell through the first explosion relief can effectively prevent the impact of pressure on the adjacent battery module and the battery tank.

[0051] When the pressure in the lithium battery module further rises and reaches a threshold value, the second explosion relief unit 3 at the center of the lower cover of the lithium battery module is started, the explosion relief channel 5 is opened for secondary explosion relief, and the fire-fighting liquid enters the lithium battery module 4 through the explosion relief channel 5. The above-mentioned secondary explosion relief mode can effectively improve the overall safety protection performance, control the thermal runaway in the first time, and avoid the thermal runaway from spreading and causing greater damage to the adjacent battery module or the battery tank.

[0052] In the embodiment of the present application, the fire-fighting liquid enters the lithium battery module 4 through the explosion relief channel 5 by static pressure, absorbs heat, and achieves the effect of cooling, pressure relief, and termination of thermal runaway and thermal runaway spreading by non-active means.

[0053] It can be understood that the lithium battery module is sealed and hung on the partition by its own gravity, the partition is connected with the lithium battery module at a wedge-shaped sealing connector, and the sealing effect is strengthened; the second explosion relief unit is arranged at the bottom of the lithium battery module, the second explosion relief unit is broken when thermal runaway occurs, the cooling fire-fighting liquid enters the lithium battery module through the explosion relief channel by static pressure, and the effect of cooling, pressure relief, and termination of thermal runaway and thermal runaway spreading is achieved by non-active means.

[0054] Optionally, in the embodiments of the present application, an external circulating liquid system can be arranged according to the situation. Specifically, the cooling fire-fighting cavity 10 can also be connected with an industrial water cooler through the water outlet pipe 13 and the water return pipe 11, and the water outlet pipe 13 is provided with a purification filtering device 15.

[0055] Embodiment 1

[0056] The battery tank for large-scale energy storage system provided by the embodiments of the present application, as shown in Figures 1-2 , comprises a shell 1, a partition plate 7, a bottom plate 2 and a lithium battery module 4. The battery tank is divided into a cooling fire-fighting cavity 10 and an electrical cavity 9 by the partition plate 7. The partition plate 7 is provided with a plurality of holes for placing the lithium battery module 4. The cross-sectional area of the upper cover 16 of the lithium battery module is greater than the cross-sectional area of the hole, so that the lithium battery module 4 is sealed and hung on the partition plate 7 under the action of its own gravity. The partition plate 7 is connected with the lithium battery module 4 at the connection position, and a wedge-shaped sealing connector 8 is arranged at the connection position. The wedge-shaped sealing connector 8 is a circular ring with an upper radius greater than a lower radius, and the cross section is a right trapezoid, which enhances the sealing effect and prevents water and water vapor from entering the electrical cavity 9 to cause short circuit and other risks. The bottom plate 2 is arranged below the lithium battery module 4 and is provided with a positioning device 14 at a position corresponding to the lithium battery module 4, which facilitates the installation and transportation of the lithium battery module. The lithium battery module 4 comprises an outer shell 17, an upper cover 16, a lower cover 19 and a battery cell 18. The bottom of the battery cell 18 is provided with a first explosion venting unit, which is an explosion venting port and an explosion venting film covering the explosion venting port in this embodiment. The cooling fire-fighting cavity 10 contains water. The lower cover position of the lithium battery module is provided with a second explosion venting unit 3. There is an explosion venting channel 5 between the bottom plate 2 and the second explosion venting unit 3. When thermal runaway occurs inside the lithium battery module, the second explosion venting unit 3 will be broken, so that water enters the lithium battery module 4 through the explosion venting channel 5 by static pressure. Water can absorb heat, and through passive means, the effect of cooling, pressure relief and termination of thermal runaway and thermal runaway spread can be achieved.

[0057] Embodiment 2

[0058] The battery tank for large-scale energy storage system provided by the embodiments of the present application, as shown in Figures 1-2 , comprises a shell 1, a partition plate 7, a bottom plate 2 and a lithium battery module 4. The battery tank is divided into a cooling fire-fighting cavity 10 and an electrical cavity 9 by the partition plate 7. The partition plate 7 is provided with a plurality of holes for placing the lithium battery module 4. The cross-sectional area of the upper cover 16 of the lithium battery module is greater than the cross-sectional area of the hole, so that the lithium battery module 4 is sealed and hung on the partition plate 7 under the action of its own gravity. The partition plate 7 is connected with the lithium battery module 4 at the connection position, and a wedge-shaped sealing connector 8 is arranged at the connection position. The wedge-shaped sealing connector 8 is a circular ring with an upper radius greater than a lower radius, and the cross section is a right trapezoid, which enhances the sealing effect and prevents water and water vapor from entering the electrical cavity 9 to cause short circuit and other risks. The bottom plate 2 is arranged below the lithium battery module 4 and is provided with a positioning device 14 at a position corresponding to the lithium battery module 4, which facilitates the installation and transportation of the lithium battery module. The lithium battery module 4 comprises an outer shell 17, an upper cover 16, a lower cover 19 and a battery cell 18. The bottom of the battery cell 18 is provided with a first explosion venting unit, which is an explosion venting port and an explosion venting film covering the explosion venting port in this embodiment. The cooling fire-fighting cavity 10 contains water. The lower cover position of the lithium battery module is provided with a second explosion venting unit 3. There is an explosion venting channel 5 between the bottom plate 2 and the second explosion venting unit 3. When thermal runaway occurs inside the lithium battery module, the second explosion venting unit 3 will be broken, so that water enters the lithium battery module 4 through the explosion venting channel 5 by static pressure. Water can absorb heat, and through passive means, the effect of cooling, pressure relief and termination of thermal runaway and thermal runaway spread can be achieved.

[0059] As shown in Figures 4-5As shown, a wedge-shaped sealing connector 8 is provided at the connection between the partition 7 and the lithium battery module 4. The wedge-shaped sealing connector 8 is a ring with an upper radius larger than its lower radius and a right-angled trapezoidal cross-section, which enhances the sealing effect and prevents water and water vapor from entering the electrical cavity 9 and causing risks such as short circuits. The base plate 2 is located below the lithium battery module 4, and a positioning device 14 is provided at a position corresponding to the lithium battery module 4 to facilitate the installation and transportation of the lithium battery module.

[0060] like Figures 6-7 As shown, the lithium battery module 4 includes a housing 17, an upper cover 16, a lower cover 19, and multiple battery cells 18. Each battery cell 18 is equipped with a first explosion-proof unit, and the lower cover of the lithium battery module 4 has a second explosion-proof unit 3. An explosion-proof channel 5 is formed between the bottom plate 2 and the second explosion-proof unit 3. When a single battery cell experiences thermal runaway, the first explosion-proof unit on that cell is activated, and the substances generated by the thermal runaway are discharged through the first explosion-proof unit and buffered within the lithium battery module containing that cell. After the battery cell experiences thermal runaway, the initial explosion-proof design, which buffers the pressure within the housing of a single battery module, effectively prevents the impact of pressure on adjacent battery modules and battery canisters. When the pressure within the lithium battery module further increases and reaches a threshold, the second explosion-proof unit 3 at the center of the lower cover of the lithium battery module is activated, opening the explosion-proof channel 5 for secondary explosion-proof, and allowing fire-fighting water to enter the lithium battery module 4 through the explosion-proof channel 5. The aforementioned secondary explosion venting method effectively enhances overall safety performance, allowing for immediate control of thermal runaway and preventing its spread and further damage to adjacent battery modules or battery tanks. Firefighting water, relying on static pressure, enters the lithium battery module 4 through the explosion venting channel 5, absorbing heat and achieving cooling, pressure relief, and termination of thermal runaway and its spread through passive means.

[0061] The lithium battery module is also provided with at least one pressure relief hole on the top cover. When the lithium battery module is subjected to secondary explosion relief, the pressure relief hole on the top cover can ensure that the fire-fighting fluid is fully backflowed, so that the liquid level inside and outside the lithium battery module housing remains consistent.

[0062] Example 3

[0063] According to Embodiment 1 or 2 of this application, a battery tank for a large-scale energy storage system is provided, such as Figure 3 As shown, a fire-fighting liquid circulation system can also be selected and installed according to site conditions and the overall system scale. In this embodiment, an industrial chiller is used. Specifically, the cooling fire chamber 10 can be connected to the industrial chiller through an outlet pipe 13 and a return pipe 11. A purification and filtration device 15 is also provided on the outlet pipe 13.

[0064] While embodiments of the application have been disclosed in connection with the above specification, it should be understood that it is exemplary only and not limiting of the scope of the application as set forth in the appended claims and equivalents thereof. Further modifications of the disclosure, such as those noted, can occur to others skilled in the art upon reading the above description. These modifications are intended to be encompassed only by the scope of the claims.

Claims

1. A battery tank for large-scale energy storage system, comprising a shell, a partition, a bottom plate, a lithium battery module, characterized in that, The battery tank is divided into a cooling fire-fighting cavity and an electrical cavity by a partition plate, a plurality of holes are arranged on the partition plate for placing the lithium battery module, the upper cover of the lithium battery module has a cross-sectional area greater than that of the hole on the partition plate, the lithium battery module is sealed and hung on the partition plate under the action of its own gravity, and the cooling fire-fighting cavity is filled with cooling fire-fighting liquid; the lithium battery module comprises a shell, an upper cover, a lower cover and at least one battery cell, and a first explosion relief unit is arranged on each battery cell; A second explosion relief unit is arranged at the position of the lower cover of the lithium battery module, and a relief channel is formed between the bottom plate and the second explosion relief unit; When the battery cell is in thermal runaway, the first explosion relief unit on the thermal runaway battery cell is started, and the substances generated by thermal runaway are buffered in the lithium battery module; when the pressure in the lithium battery module continuously rises to reach a pressure threshold, the second explosion relief unit at the lower cover of the lithium battery module is started to open the relief channel, so that the cooling fire-fighting liquid enters the lithium battery module and the battery cell in thermal runaway through the relief channel by static pressure; At least one pressure relief hole is further arranged at the upper cover of the lithium battery module, so that when the lithium battery module is subjected to secondary explosion relief, the cooling fire-fighting liquid can be fully backflowed through the pressure relief hole at the upper cover, so that the liquid levels inside and outside the lithium battery module shell remain consistent.

2. The battery can according to claim 1, wherein, The bottom plate is arranged below the battery tank and is provided with a positioning device at a position corresponding to the lithium battery module.

3. The battery can according to claim 1, wherein, The partition plate is connected to the lithium battery module by a wedge-shaped sealing connector.

4. The battery can according to claim 3, wherein, The wedge-shaped sealing connector is a circular ring with an upper radius greater than a lower radius, and a cross section is a right trapezoid.

5. The battery can according to claim 1, wherein, The hole is a circular hole, and the lithium battery module is a cylindrical battery module.

6. The battery can according to claim 1, wherein, The hole is a square hole, and the lithium battery module is a square battery module.

7. The battery can according to claim 1, wherein, The positive and negative electrodes of the lithium battery module are connected to the electrical cavity above the partition plate by wires. The electrical cavity is provided with a control unit, and the control unit comprises one or more of a battery management system, a bus bar and an energy storage converter.

8. The battery can according to claim 1, wherein, The battery tank body is grounded and electrically connected.

9. The battery can according to claim 8, wherein, The upper cover, the lower cover and the shell of the lithium battery module are made of aluminum alloy, or a metal material or a non-metal material with strength and corrosion resistance comparable to that of aluminum alloy.

10. The battery can according to claim 1, wherein, The cooling fire-fighting liquid is water.

11. The battery can according to claim 1, wherein, The cooling fire-fighting cavity is connected to a cooling fire-fighting liquid circulating device through a water outlet pipe and a water return pipe.

12. The battery can according to claim 11, wherein, The cooling fire-fighting liquid circulating device is an industrial water chiller.

13. The battery can according to claim 11, wherein, The water outlet pipe is provided with a purification filter device.

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