High-capacity battery and electric equipment

Abstract

The utility model discloses a high-capacity battery and electric equipment. The high-capacity battery comprises a plurality of single batteries which are arranged side by side, an electrolyte region and a gas region are arranged in an inner cavity of the battery monomer; positive terminals of all the battery monomers are connected to serve as a total positive electrode, and negative terminals of all the battery monomers are connected to serve as a total negative electrode; the gas areas of the battery monomers are communicated through gas communication channels on the battery monomers, and the electrolyte areas of the battery monomers are communicated through electrolyte communication channels on the battery monomers; an electric on-off valve is arranged on the gas communication channel; an explosion venting part is arranged on the electrolyte communicating channel; when explosion venting occurs at the explosion venting part on the electrolyte communication channel, part of electrolyte in the electrolyte communication channel is sprayed out and then treated, meanwhile, the electric on-off valve of the gas communication channel is opened, and a fire-fighting medium is injected into the inner cavity of each battery monomer through the gas communication channel, so that the spreading of thermal runaway is inhibited.

Description

Technical Field

[0001] The utility model belongs to the field of batteries, and specifically relates to a large-capacity battery and electrical equipment. Background Art

[0002] Common lithium-ion batteries are divided into button batteries, square batteries and cylindrical batteries according to their appearance.

[0003] The electrode components in the square battery are arranged in the order of positive electrode-diaphragm-negative electrode, assembled by lamination or winding process, and then encapsulated in a square aluminum shell.

[0004] With the continuous development of science and technology, the market demand for batteries with high safety and large capacity is getting stronger and stronger. Therefore, how to ensure the safety of batteries while increasing the battery capacity has become a technical hotspot in the battery field. Summary of the invention

[0005] In order to solve the problem of how to ensure battery safety under the premise of increasing battery capacity, the first aspect of the utility model provides a large-capacity battery.

[0006] The large-capacity battery comprises a plurality of battery cells arranged side by side; the inner cavity of the battery cell has an electrolyte area and a gas area; the positive polarity terminals of all the battery cells are connected as a total positive electrode, and the negative polarity terminals of all the battery cells are connected as a total negative electrode;

[0007] The gas areas of the battery cells are connected through the gas communication channels on the multiple battery cells, and the electrolyte areas of the battery cells are connected through the electrolyte communication channels on the multiple battery cells;

[0008] An electric on-off valve is provided on the gas communication channel; an explosion relief part is provided on the electrolyte communication channel;

[0009] When an explosion occurs at the explosion venting part on the electrolyte connecting channel, part of the electrolyte in the electrolyte connecting channel is sprayed out and processed. At the same time, the electric on-off valve of the gas connecting channel is opened, and the fire-fighting medium is injected into the inner cavity of each battery cell through the gas connecting channel, thereby suppressing the spread of thermal runaway.

[0010] Since the gas areas of the battery cells in the large-capacity battery are connected through the gas connecting channel, and the electrolyte areas of the battery cells are connected through the electrolyte connecting channel, the inner cavities of the battery cells are placed in a pressure system. When the temperature of the large-capacity battery continues to rise, the pressure in the pressure system continues to increase. When the pressure reaches the limit value, the explosion venting part is opened, the electrolyte is sprayed out, and the electric on-off valve is opened. The fire-fighting medium is injected into the inner cavity of each battery cell, so that each battery cell can be cooled in a short time, thereby reducing the further spread of thermal runaway.

[0011] Furthermore, the gas communication channel and the electrolyte communication channel are two hollow components respectively.

[0012] Furthermore, the large-capacity battery further comprises a box body, a plurality of battery cells are arranged side by side in the box body, and a gas communication channel is provided on the top plate of the box body for connecting the gas areas of the inner cavities of the battery cells;

[0013] Avoidance holes are provided on the top plate of the box body corresponding to the polarity terminals of each battery cell; each battery cell polarity terminal extends out of the avoidance hole, and the top plate area of ​​the box body corresponding to the avoidance hole is fixedly sealed with the battery cell shell;

[0014] The bottom plate of the box body is provided with an electrolyte communication channel which connects the electrolyte area of ​​the inner cavity of the battery monomer.

[0015] Furthermore, the above-mentioned large-capacity battery also includes a heat exchange tube; the heat exchange tube cooperates with the mounting portion of the polarity terminal of each battery cell.

[0016] The second aspect of the utility model provides an electrical device, including a fire medium box, a fire pipeline, an electrolyte collection pipeline, a collection tank, and at least one large-capacity battery as described in the first aspect;

[0017] The fire protection pipeline includes a first main pipeline and a first branch pipeline. One end of the first main pipeline is connected to the fire protection medium box, and the other end of the first main pipeline is connected to the electric on-off valves of the gas communication channels on the large capacity batteries through a plurality of first branch pipelines.

[0018] The electrolyte collection pipeline includes a second main pipeline and a second branch pipeline. One end of the first main pipeline is connected to the collection tank, and the other end of the second main pipeline is connected to the explosion relief parts of the electrolyte communication channels on the large capacity batteries through multiple second branch pipelines.

[0019] Furthermore, the fire-fighting medium filled in the fire-fighting medium box is perfluorohexanone. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of a large-capacity battery in Example 1;

[0021] Figure 2 Schematic diagram of the structure of a battery cell Figure 1 ;

[0022] Figure 3 Schematic diagram of the structure of a battery cell Figure 2 ;

[0023] Figure 4 This is a schematic diagram of the structure of a large-capacity battery in Example 2;

[0024] Figure 5 This is a schematic diagram of the structure of the electrical equipment in Example 3.

[0025] The reference numerals are as follows:

[0026] 1-shell, 11-top cover, 12-housing, 13-bottom cover, 2-first sealed opening piece, 3-polarity terminal, 4-installation part, 5-second sealed opening piece;

[0027] 100-battery cell, 200-gas connecting channel, 300-electrolyte connecting channel, 400-box, 500-heat exchange tube, 600-large capacity battery, 700-fire medium box, 800-fire pipeline, 801-first main pipeline, 802-first branch pipeline, 900-electrolyte collecting pipeline, 901-second main pipeline, 902-second branch pipeline, 1000-electric on-off valve, 1100-explosion relief part, 1200-collection tank. DETAILED DESCRIPTION

[0028] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments, not all of the embodiments. Based on the following embodiments, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this utility model.

[0029] At the same time, it should be noted that the orientations or positional relationships indicated by the terms "top, bottom, inside and outside" in the text are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the technical solution. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] In this utility model, unless otherwise specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a connection inside a machine. For ordinary technicians in this field, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0031] Batteries produce gas during use. When multiple battery cells are connected in parallel or series to form a large-capacity battery, the gas production of each battery cell is different (i.e., the internal pressure of each battery cell is different) due to differences in the consistency of the battery cells. As the internal pressure of the battery cells continues to increase, the shells of each battery cell expand to varying degrees, and the performance of the large-capacity battery will decline rapidly. What's more, when the gas production of a certain battery cell is too large, thermal runaway will occur.

[0032] Therefore, the utility model provides a large-capacity battery, wherein the gas areas of the multiple battery cells of the large-capacity battery are connected through a gas connecting channel, so that the internal pressure of each battery cell can be kept consistent, and the expansion degree of each battery cell shell is basically consistent, thereby reducing the probability of thermal runaway of the large-capacity battery; at the same time, in the utility model, the fire-fighting medium can be directly injected into the inner cavity of each battery cell by using the gas connecting channel, thereby suppressing the spread of thermal runaway.

[0033] Example 1

[0034] like Figure 1 As shown, this embodiment discloses a large-capacity battery, comprising a plurality of battery cells 100 arranged side by side; the inner cavity of the battery cell 100 has an electrolyte area and a gas area; the positive polarity terminals of all battery cells 100 are connected as a total positive electrode, and the negative polarity terminals of all battery cells 100 are connected as a total negative electrode;

[0035] The gas areas of the battery cells 100 are connected through the gas communication channels 200, and the electrolyte areas of the battery cells 100 are connected through the electrolyte communication channels 300;

[0036] The gas communication channel 200 is provided with an electric on-off valve 1000; the electrolyte communication channel 300 is provided with an explosion relief part 1100;

[0037] When the explosion relief part 1100 on the electrolyte communication channel 300 is vented, part of the electrolyte in the electrolyte communication channel 300 is sprayed out and processed, and at the same time, the electric on-off valve 1000 of the gas communication channel 200 is opened, and the firefighting medium is injected into the inner cavity of each battery cell 100 through the gas communication channel 200, thereby suppressing the spread of thermal runaway.

[0038] Specifically, Figure 2 and Figure 3 As shown, the battery cell 100 includes a housing 1, an electrode assembly, a first sealing opening member 2 and a second sealing opening member 5;

[0039] The housing 1 is a component for forming an internal environment of the battery cell 100, wherein the formed internal environment can be used to accommodate the electrode assembly, electrolyte and other components. The housing 1 can be of various shapes and sizes, such as a rectangular parallelepiped. Specifically, the shape of the housing 1 can be determined according to the specific shape and size of the electrode assembly.

[0040] The shell 1 can be in the following two forms:

[0041] 1. The housing 1 includes a top cover 11 and an outer shell 12 with an open top; the top cover 11 is provided with a positive terminal and a negative terminal of the battery cell; the top cover 11 is sealed and installed on the outer shell 12 with an open top, a first sealed opening piece 2 is provided on the top cover, and a second sealed opening piece 5 is provided on the outer shell 12; the first sealed opening piece 2 and the second sealed opening piece 5 have the same structural form.

[0042] 2. The shell 1 includes a top cover 11, a bottom cover 13 and an outer shell 12 with both top and bottom openings; the top cover 11 is provided with a positive terminal and a negative terminal of the battery cell; the top cover 11 is sealed and installed on the top opening of the outer shell 12, and the bottom cover 13 is sealed and installed on the bottom opening of the outer shell 12. A first sealed opening piece 2 is provided on the top cover, and a second sealed opening piece 5 is provided on the bottom cover 13. The first sealed opening piece 2 and the second sealed opening piece 5 have the same structural form.

[0043] The electrode assembly is the part of the battery cell where the electrochemical reaction occurs. The housing may contain one or more electrode assemblies. The electrode assembly is also provided with tabs. During the charge and discharge process of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte. The electrode assembly is made of multiple layers of pole sheets by winding or laminating, and each layer of pole sheets includes a positive electrode sheet, a separator and a negative electrode sheet.

[0044] The electrode assembly is located inside the shell and connected to the polarity terminal 3 on the top of the shell 1; a mounting portion 4 for mounting a heat exchange tube is provided on the polarity terminal 3; when a plurality of battery cells 100 are assembled into a large-capacity battery, the temperature of the electrode assembly in each battery cell 100 can be transferred from the polarity terminal to an external temperature control device through the heat exchange tube, thereby reducing the problem of overheating of the electrode assembly affecting the performance of the large-capacity battery. More importantly, direct temperature control of each electrode assembly reduces the probability of thermal runaway, thereby improving safety.

[0045] Specifically, the installation portion of the heat exchange tube in the present invention has two forms:

[0046] Method 1: A through hole is opened on the polarity terminal 3, and the through hole is arranged perpendicular to the axial direction of the polarity terminal 3; the aperture size of the through hole needs to ensure that the heat exchange tube is tightly clamped therein to ensure installation stability while ensuring the heat transfer effect between the heat exchange tube and the polarity terminal.

[0047] Method 2: A groove is provided on the top or side wall of the polarity terminal 3; the width of the groove needs to ensure that the heat exchange tube is tightly clamped therein, so as to ensure the installation stability while ensuring the heat transfer effect between the heat exchange tube and the pole.

[0048] Since the battery cell polarity terminal 3 is charged, in order to ensure safety, the heat exchange tube and the battery cell polarity terminal 3 must be insulated. The insulation can be maintained by oxidizing the heat exchange tube or providing an insulating layer in the area where the heat exchange tube contacts the polarity terminal.

[0049] The first sealed opening piece 2 and the second sealed opening piece 5 can be opened under the action of external force, and then the first through hole and the second through hole are formed on the shell of the battery cell; the first sealed opening piece 2 and the second sealed opening piece 5 can select the sealing mechanism disclosed in the Chinese patent, publication number CN219457981U, or select the sealing mechanism disclosed in the Chinese patent, publication number CN117810623A.

[0050] The first sealed opening piece 2 and the second sealed opening piece 5 can be installed on the battery cell shell in advance during the battery cell manufacturing process, or the finished battery cell can be modified by first opening the first through hole and the second through hole on the finished battery cell, and then installing the first sealed opening piece 2 and the second sealed opening piece 5 at the first through hole and the second through hole respectively.

[0051] In this embodiment, the gas connecting channel 200 is a hollow component with a rectangular cross-section. A plurality of air holes are opened on the first hollow component. The first hollow component is fixed on the shell of each battery cell 100, and the plurality of air holes of the first hollow tube correspond one by one to the first through holes of the battery cell. The gas generated in each battery cell 100 overflows into the first hollow tube after passing through the first through holes and air holes, so that the gas pressure in each battery cell remains consistent, and the fire-fighting medium can also be injected into the inner cavity of each battery cell through the gas connecting channel, which not only directly acts on the battery cell that has thermal runaway, but also injects the fire-fighting medium into other battery cells, thereby suppressing the spread of thermal runaway.

[0052] In this embodiment, the electrolyte connecting channel 300 is a second hollow component with a rectangular cross-section. A plurality of liquid holes are opened on the second hollow component. The second hollow component is fixed on the shell of each battery cell 100, and the plurality of liquid holes of the second hollow tube correspond one by one to the first through holes of the battery cell. The electrolyte area in each battery cell 100 is connected through the second through hole, the liquid hole and the second hollow tube, so that the electrolyte in each battery cell remains consistent.

[0053] Therefore, each battery cell in the large-capacity battery is not only in a shared gas system, but also in a shared electrolyte system, which makes the consistency of each battery cell better and further improves the cycle life of the large-capacity battery.

[0054] Since the electrolyte areas of each battery cell in the large-capacity battery are connected (each battery cell is in a shared electrolyte system), when a battery cell is in the early stage of thermal runaway, the electrolyte in the shared electrolyte system will absorb the temperature in the battery cell where thermal runaway occurs, slowing down the speed at which the battery cell produces severe thermal runaway. As the thermal runaway continues, the explosion venting part of the large-capacity battery opens, and the thermal runaway smoke rushes out of the large-capacity battery. At the same time, the electric on-off valve opens, and the fire-fighting medium is injected into the inner cavity of each battery cell through the gas connecting channel, further suppressing the spread of thermal runaway and improving the safety of large-capacity batteries.

[0055] The firefighting medium may be water, a mixture of water and ethylene glycol, or perfluorohexanone; from the perspective of suppressing the spread of thermal runaway, in this embodiment, perfluorohexanone is preferably used as the firefighting medium.

[0056] Example 2

[0057] like Figure 4 As shown, this embodiment discloses a large-capacity battery, including a box body 400 and a plurality of battery cells 100;

[0058] A plurality of battery cells 100 are arranged in the box 400 along the same direction, and the electrolyte areas of the battery cells are interconnected through the electrolyte communication channel 300 on the large-capacity battery; an explosion relief portion 1100 is provided on the electrolyte communication channel 300;

[0059] A pole avoidance hole is provided on the top plate of the box body 400 corresponding to the polarity terminal of each battery cell 100; the polarity terminal of each battery cell 100 extends out of the pole avoidance hole, and the top plate area of ​​the box body corresponding to the pole avoidance hole is fixedly sealed with the shell of the battery cell 100;

[0060] The positive terminals of all battery cells 100 are connected as a total positive electrode, and the negative terminals of all battery cells 100 are connected as a total negative electrode;

[0061] The box body 400 is provided with a gas communication channel 200 extending along the arrangement direction of the battery cells, and the gas communication channel 200 connects the gas areas of the inner cavities of the battery cells 100, so that the gas pressure in the battery cells 100 remains consistent, and an electric on-off valve 1000 is provided on the gas communication channel 200;

[0062] The box has the following three forms:

[0063] 1. The box body 400 includes a cylinder, a first cover plate, and a second cover plate; the top and bottom of the cylinder are both open, the first cover plate is sealed and fixed (welded) to the top of the cylinder, and the second cover plate is sealed and fixed (welded) to the bottom of the cylinder;

[0064] The first cover plate is provided with a plurality of pole avoidance holes for the extension of the polarity terminals of a plurality of battery cells, and the first cover plate is integrally formed with a groove body protruding upward, which serves as a gas communication channel; the second cover plate is integrally formed with a groove serving as an electrolyte sharing chamber.

[0065] 2. The box body 400 includes a U-shaped shell, a first cover plate, a third cover plate and a fourth cover plate; the top, front and rear of the U-shaped shell are all open, the first cover plate is sealed and fixed (welded) to the top of the U-shaped shell, and the third cover plate and the fourth cover plate are sealed and fixed (welded) to the front and rear of the U-shaped shell respectively.

[0066] The first cover plate is provided with a plurality of pole avoidance holes for the extension of the polarity terminals of a plurality of battery cells. The first cover plate is integrally formed with a groove body protruding upward, which serves as a gas connection channel. A groove is integrally formed on the bottom of the U-shaped shell as an electrolyte connection channel.

[0067] 3. The box body 400 includes a cylinder, a third cover plate, and a fourth cover plate; the front and rear of the cylinder are open, the third cover plate is sealed and fixed (welded) to the front of the cylinder, and the fourth cover plate is sealed and fixed (welded) to the rear of the cylinder;

[0068] The top of the cylinder is provided with a plurality of pole avoidance holes for the extension of the polarity terminals of a plurality of battery cells. The top of the cylinder is integrally formed with a groove body protruding upward, which serves as a gas communication channel; the bottom of the cylinder is integrally formed with a groove as an electrolyte communication channel.

[0069] In the above three types of shells, the cylinder and the U-shaped shell can be spliced ​​by welding, or can be integrally formed by casting or stamping. In order to facilitate processing and ensure sealing, the integral forming method is usually selected.

[0070] In order to ensure the sealing of the box, the box area corresponding to the pole avoidance hole needs to be fixedly sealed with the battery cell shell; the fixed sealing at this location can be achieved in the following three ways:

[0071] Method 1: The edge of the pole avoidance hole can be welded to the top cover of the battery cell to achieve sealing;

[0072] However, if the dimensions of each battery cell along the height direction are not completely equal, some battery cell top covers with smaller height dimensions may have problems with poor welding or even be unable to be welded to the top of the box body. In this case, the following method 2 or method 3 can be used.

[0073] Method 2: A weak portion is provided in the peripheral area of ​​the pole avoidance hole. During the welding process, the size difference in the height direction of the top of each battery cell shell is compensated by the deformation of the weak portion, so that the polarity terminals of all battery cells extend out of the pole avoidance hole. The weak portion in this embodiment can be an annular groove with the center of the pole avoidance hole as the center point and opened along the peripheral area of ​​the pole avoidance hole. In other embodiments, the weak portion can also be a long strip groove opened in the peripheral area of ​​the pole avoidance hole. In other embodiments, if there is a similar problem, that is, all the polarity terminals of the battery cells cannot be fully extended out of the pole avoidance hole at the same time, the solution can be adopted to add a weak portion in the peripheral area of ​​the pole avoidance hole.

[0074] Method 3: Add a hollow connector between the pole avoidance hole and the polarity terminal; the bottom of the hollow connector is used to be sealed and connected to the first area of ​​the battery cell, and the top of the hollow connector is sealed and connected to the second area of ​​the box; the first area is the area located around any polarity terminal in any battery cell; the second area is the area corresponding to any pole avoidance hole on the box. The area corresponding to the pole avoidance hole is the surrounding area on the top outer surface of the box corresponding to any pole avoidance hole; or the area corresponding to the pole avoidance hole is the wall of the pole avoidance hole. Among them, the area around the pole avoidance hole is the area around the insulating sealing pad on the pole avoidance hole. The insulating sealing pad is a part on the battery cell used to insulate the pole avoidance hole and the top cover.

[0075] In the above embodiments 1 and 2, a heat exchange tube 500 is provided on the large-capacity battery; the heat exchange tube 500 cooperates with the mounting portion of the polarity terminal of each battery cell.

[0076] The heat exchange tube 500 can be specifically provided in the following ways:

[0077] 1. An aluminum tube is bent into a U-shaped structure, and two parallel tube sections are used to cooperate with the total positive electrode and the total negative electrode respectively, so as to realize the heat exchange between each battery cell and the external temperature control device, and the liquid inlet and liquid outlet of the aluminum tube are located on the same side; the transmission medium in the aluminum tube can be water, insulating oil or fluorinated liquid; or two aluminum tubes can be used to cooperate with the total positive electrode and the total negative electrode respectively.

[0078] 2. Two cored heat pipes are used to cooperate with the total positive electrode and the total negative electrode respectively, so as to realize the heat exchange between each battery cell and the external temperature control device. The cored heat pipe is an evaporation-condensation type heat exchange device, which realizes heat transfer by the state change of the working fluid in the pipe.

[0079] Since the heat transfer effect of the cored heat pipe is affected by the length of the cored heat pipe, when the number of battery cells in a large-capacity battery is large (i.e., the length of the large-capacity battery is long), the use of the cored heat pipe will be limited. Therefore, in this embodiment, aluminum tubes are preferably selected as heat exchange tubes. If the insulation between the heat exchange tubes and the polarity terminals can be effectively ensured, water can be preferably used as the heat transfer medium flowing in the aluminum tube from the aspects of heat transfer efficiency and cost.

[0080] Example 3

[0081] like Figure 5 As shown, this embodiment provides an electric device, which may be an electric vehicle or an energy storage system, including a fire medium box 700, a fire pipeline 800, an electrolyte collection pipeline 900, a collection tank 1200, and at least one large-capacity battery 600 described in Embodiment 1 or 2;

[0082] The fire protection pipeline 800 includes a first main pipeline 801 and a first branch pipeline 802. One end of the first main pipeline 801 is connected to the fire protection medium box, and the other end of the first main pipeline 801 is connected to the electric on-off valves 1000 of the gas communication channels on the large capacity batteries through a plurality of first branch pipelines 802.

[0083] The electrolyte collection pipeline 900 includes a second main pipeline 901 and a second branch pipeline 902. One end of the second main pipeline 901 is connected to the collection tank 1200, and the other end of the second main pipeline 901 is connected to the explosion relief parts 1100 of the electrolyte communication channels on the large capacity batteries through a plurality of second branch pipelines 902.

[0084] During the operation of the electrical equipment, when the internal pressure of a large-capacity battery in the electrical equipment increases to a certain extent (before thermal runaway occurs), the explosion venting part 1100 corresponding to the large-capacity battery opens, and the electrolyte in the large-capacity battery is ejected from the explosion venting part. The ejected electrolyte passes through the second main line 901 and the second branch line 902 in sequence and then enters the collection tank 1200. At the same time, after sensing that the explosion venting part 1100 is opened, the electric on-off valve 1000 automatically opens, and the fire-fighting medium in the fire-fighting medium box is injected into the inner cavity of each battery cell in the large-capacity battery from the first main line 801, the first branch line 802, the gas connecting channel 200, the air hole and the first through hole in sequence, thereby suppressing the further spread of thermal runaway.

Claims

1. A large capacity battery, characterized in that: It comprises a plurality of battery cells arranged side by side; the inner cavity of the battery cell has an electrolyte area and a gas area; The positive terminals of all battery cells are connected as a total positive electrode, and the negative terminals of all battery cells are connected as a total negative electrode; The gas areas of the battery cells are connected through the gas communication channels on the multiple battery cells, and the electrolyte areas of the battery cells are connected through the electrolyte communication channels on the multiple battery cells; An electric on-off valve is provided on the gas communication channel; An explosion relief portion is provided on the electrolyte communication channel; When an explosion occurs at the explosion venting part on the electrolyte connecting channel, part of the electrolyte in the electrolyte connecting channel is sprayed out and processed. At the same time, the electric on-off valve of the gas connecting channel is opened, and the fire-fighting medium is injected into the inner cavity of each battery cell through the gas connecting channel, thereby suppressing the spread of thermal runaway.

2. A large capacity battery according to claim 1, characterized in that: The gas communication channel and the electrolyte communication channel are two hollow components respectively.

3. A large capacity battery according to claim 2, characterized in that: It also includes a box body, a plurality of battery cells are arranged side by side in the box body, and a top plate of the box body is provided with a gas communication channel for connecting the gas areas of the inner cavities of the battery cells; Avoidance holes are provided on the top plate of the box body corresponding to the polarity terminals of each battery cell; each battery cell polarity terminal extends out of the avoidance hole, and the top plate area of ​​the box body corresponding to the avoidance hole is fixedly sealed with the battery cell shell; The bottom plate of the box body is provided with an electrolyte communication channel which connects the electrolyte area of ​​the inner cavity of the battery monomer.

4. A large capacity battery according to any one of claims 1 to 3, characterized in that: It also includes a heat exchange tube; the heat exchange tube is matched with the mounting portion of each battery cell polarity terminal.

5. An electrical device, characterized in that: It includes a fire-fighting medium box, a fire-fighting pipeline, an electrolyte collection pipeline, a collection tank, and at least one large-capacity battery as claimed in claim 1; The fire protection pipeline includes a first main pipeline and a first branch pipeline. One end of the first main pipeline is connected to the fire protection medium box, and the other end of the first main pipeline is connected to the electric on-off valves of the gas communication channels on the large capacity batteries through a plurality of first branch pipelines. The electrolyte collection pipeline includes a second main pipeline and a second branch pipeline. One end of the second main pipeline is connected to the collection tank, and the other end of the second main pipeline is connected to the explosion relief parts of the electrolyte communication channels on the large capacity batteries through multiple second branch pipelines.

6. An electrical equipment according to claim 5, characterized in that: The fire-fighting medium filled in the fire-fighting medium box is perfluorohexanone.

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