High-capacity battery

Abstract

The utility model discloses a fire-fighting medium storage bin and a high-capacity battery. The fire-fighting medium storage bin comprises a bin body, a sealing element and a fire-fighting medium, the fire-fighting medium storage bin is filled with a fire-fighting medium, at least one sealing piece is arranged on the bin body, and the fire-fighting medium overflows out of the bin body after the sealing piece is melted at the set temperature. When the temperature of the battery rises to the set temperature, the sealing piece on the fire-fighting medium storage bin is melted, and the fire-fighting medium can overflow from the fire-fighting medium storage bin, so that the thermal runaway phenomenon is avoided to a certain extent, and the fire-fighting medium can inhibit the spreading of the thermal runaway when the thermal runaway phenomenon occurs.

Description

Technical Field

[0001] The utility model belongs to the field of batteries, and particularly relates to a fire-fighting medium storage bin and a large-capacity battery. Background Technique

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

[0003] In a square battery, the electrode assembly is arranged in the order of positive electrode - separator - negative electrode, and is assembled by a stacking or winding process, and then encapsulated into a square aluminum shell.

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

[0005] To solve the problem of how to ensure the safety of the battery on the premise of increasing the battery capacity, the first aspect of the utility model provides a fire-fighting medium storage bin;

[0006] The fire-fighting medium storage bin includes a bin body, a seal and a fire-fighting medium; the fire-fighting medium storage bin is filled with a fire-fighting medium, and at least one seal is arranged on the bin body, and the fire-fighting medium overflows from the bin body after the seal melts at a set temperature.

[0007] When the battery temperature rises to the set temperature, the seal on the fire-fighting medium storage bin melts, and the fire-fighting medium can overflow from the fire-fighting medium storage bin, which not only avoids the occurrence of thermal runaway to a certain extent, but also when thermal runaway occurs, the fire-fighting medium can inhibit the spread of thermal runaway.

[0008] Further, seals are arranged on both opposite side plates of the fire-fighting medium storage bin. Since the seals are respectively arranged on two opposite side plates of the fire-fighting medium storage bin, the fire-fighting medium in the fire-fighting medium storage bin can smoothly enter the inner cavity of the large-capacity battery box, and the fire-fighting effect is better.

[0009] Further, since the lithium-ion battery is in the high-temperature triggering stage between 60°C and 100°C, the battery can still operate safely at this stage, but thermal runaway is about to occur. Therefore, the above-mentioned seal is a polyethylene layer. When in use, the polyethylene layer is not only insoluble in the electrolyte, and the melting temperature of the polyethylene layer is between 85 and 136°C, and the fire-fighting medium in the fire-fighting medium storage bin overflows after the polyethylene layer melts.

[0010] Further, the fire-fighting medium filled in the above-mentioned fire-fighting medium storage bin is perfluoromethyl hexanone.

[0011] The second aspect of the utility model provides a large-capacity battery.

[0012] The large-capacity battery includes a box body, battery cells, and a fire-fighting medium storage bin as described in the first aspect;

[0013] There are multiple battery cells, and the multiple battery cells are arranged side by side in the box body. The inner cavity of each battery cell has an electrolyte area and a gas area; the electrolyte areas in the inner cavities of the battery cells communicate with each other, so that each battery cell is in a shared electrolyte system;

[0014] Avoidance holes are provided on the top plate of the box body corresponding to the polar terminals of each battery cell; the polar terminals of each battery cell extend out of the avoidance holes, and the area of the top plate of the box body corresponding to the avoidance holes is fixedly sealed with the battery cell housing;

[0015] The positive terminals of all battery cells are connected as the total positive electrode, and the negative terminals of all battery cells are connected as the total negative electrode;

[0016] The fire-fighting medium storage bin is installed in the box body. The fire-fighting medium storage bin is filled with a fire-fighting medium. At least one seal is provided on the bin body of the fire-fighting medium storage bin. After the seal melts at a set temperature, a release hole is formed for the fire-fighting medium to overflow into the box body.

[0017] In the present utility model, since each battery cell is in a shared electrolyte system, the electrolyte consumption of each battery cell can always be kept basically the same, ensuring the consistency of each battery cell and improving the cycle life of the large-capacity battery; in addition, since a fire-fighting medium storage bin is provided in the large-capacity battery, when the temperature reaches the set temperature, the seal is melted, the release hole on the fire-fighting medium storage bin is opened, and the fire-fighting medium overflows into the inner cavity of the large-capacity battery box body. Due to the action of the fire-fighting medium in the shared electrolyte system, the occurrence of thermal runaway is avoided to a certain extent, and when a certain battery cell has a thermal runaway, the fire-fighting medium can also inhibit the spread of the thermal runaway.

[0018] Further, in order to enable the fire-fighting medium storage bin to quickly respond to thermal runaway and at the same time inhibit thermal runaway, the above-mentioned fire-fighting medium storage bin is placed between two adjacent battery cells in the middle position; seals are provided on both the top and bottom of the fire-fighting medium storage bin. Since the seals are respectively provided on the top and bottom of the fire-fighting medium storage bin, release holes can be formed on both the top and bottom of the fire-fighting medium storage bin, enabling the fire-fighting medium in the fire-fighting medium storage bin to smoothly enter the inner cavity of the large-capacity battery box body, and the fire-fighting effect is better.

[0019] Further, from the perspective of facilitating processing and production and reducing costs, the external dimensions and materials of the fire-fighting medium storage bin are the same as those of the battery cell housing.

[0020] Furthermore, in order to keep each battery cell in a substantially identical air pressure environment and reduce the probability of thermal runaway in large-capacity batteries, a gas communication channel is provided at the top of the above-mentioned box body for communicating the gas areas of each battery cell.

[0021] Furthermore, in order to make the continuity of the electrolyte liquid level better when the electrolyte areas of each battery cell are communicated, avoid the occurrence of liquid breakage, and also enable the fire extinguishing medium in the fire extinguishing medium storage bin to flow smoothly into the box body, an electrolyte communication channel is provided at the bottom of the above-mentioned box body.

[0022] Furthermore, the above-mentioned large-capacity battery further includes a heat exchange tube; the heat exchange tube cooperates with the heat exchange tube mounting parts of the polar terminals of each battery cell. The heat exchange tube is connected to the polar terminals of each battery cell to conduct the heat of the polar terminals where the heat is most concentrated on each battery cell to the outside for heat dissipation. This heat dissipation method not only achieves balanced heat dissipation for each battery cell in the large-capacity battery, improves the use safety of the large-capacity battery, but also has a simple structure, is easy to manufacture and assemble, and has a low manufacturing cost. Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0024] Figure 1 It is a schematic structural diagram of the fire extinguishing medium storage bin;

[0025] Figure 2 It is a schematic structural diagram of the large-capacity battery in Embodiment 2;

[0026] Figure 3 It is a cross-sectional view of the large-capacity battery in Embodiment 2;

[0027] Figure 4 It is a schematic structural diagram of the battery cell in Embodiment 2;

[0028] Figure 5 It is a schematic structural diagram of the large-capacity battery in Embodiment 3;

[0029] Figure 6 It is a cross-sectional view of the large-capacity battery in Embodiment 3;

[0030] Figure 7 It is a schematic structural diagram of the battery cell in Embodiment 3;

[0031] The reference numerals are as follows:

[0032] 1 - Housing, 11 - Top cover, 12 - Outer shell, 13 - Bottom cover, 2 - First sealed opening package, 3 - Positive terminal, 4 - Negative terminal, 5 - Second sealed opening package, 6 - Heat exchange tube installation part;

[0033] 100 - Box body, 200 - Battery cell, 300 - Fire - fighting medium storage bin, 301 - Bin body, 302 - Sealing element, 400 - Gas communication channel, 500 - Electrolyte communication channel, 600 - Heat exchange tube, 700 - Liquid injection and replacement interface. Specific embodiments

[0034] Next, the technical solutions in the embodiments will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments, rather than all the embodiments. Based on the following embodiments, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0035] Meanwhile, it should be noted that the orientation or positional relationship indicated by terms such as "top, bottom, inner, and outer" in the text is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of simplified description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to 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.

[0036] Unless otherwise clearly defined and limited in the present utility model, the terms "installation, connection, and coupling" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. Similarly, it can also be the communication inside the machine. For those of ordinary skill in the art, the specific meanings of the above - mentioned terms in the present utility model can be understood according to specific situations.

[0037] Embodiment 1

[0038] As Figure 1 shown, this embodiment provides a fire - fighting medium storage bin 300, including a bin body 301, a sealing element 302, and a fire - fighting medium. The bin body 301 is filled with a fire - fighting medium, and at least one sealing element 302 is provided on the bin body 301. After the sealing element 302 melts at a set temperature, the fire - fighting medium overflows from the bin body 301.

[0039] The fire-fighting medium storage bin 300 can be installed in the inner cavity of the battery cell, and the fire-fighting medium storage bin 300 is in contact with the housing of the battery cell, or the fire-fighting medium storage bin 300 is in contact with the electrode assembly in the inner cavity of the battery cell; when the temperature of the battery cell rises to the set temperature (about 100 °C), the seal melts, and the fire-fighting medium overflows from the bin body into the inner cavity of the battery cell, which not only avoids the occurrence of thermal runaway to a certain extent, but also when the battery cell has a thermal runaway, the fire-fighting medium can also inhibit the spread of the thermal runaway.

[0040] In this embodiment, the battery cell can be a square aluminum lithium-ion battery, a soft-pack lithium-ion battery or a cylindrical lithium-ion battery;

[0041] At the same time, the fire-fighting medium storage bin can also be installed in an existing battery pack, and the fire-fighting medium storage bin is in contact with the housing of a certain battery cell in the battery pack; when the temperature of the seal rises to the set temperature (about 100 °C), the seal melts, and the fire-fighting medium overflows from the bin body into the box body of the battery pack, which not only avoids the occurrence of thermal runaway to a certain extent, but also when the battery cell has a thermal runaway, the fire-fighting medium can also inhibit the spread of the thermal runaway.

[0042] Among them, the fire-fighting medium can be water, or a mixture of water and ethylene glycol, or perfluoromethylcyclohexanone; from the perspective of the cooling effect and the effect of inhibiting the spread of thermal runaway, in this embodiment, perfluoromethylcyclohexanone is preferably used as the fire-fighting medium.

[0043] The seal 302 is made of a material that is insoluble in the electrolyte and begins to melt and shrink at about 100 °C:

[0044] The first is a layer structure made of polyethylene material injection-molded on the bin body. When the set temperature is reached, this layer structure melts to form a release hole, and then the fire-fighting medium overflows outside the bin body;

[0045] The second is to open a release hole on the bin body, and fix and cover a layer structure made of polyethylene material on the release hole of the bin body by hot melting. When the set temperature is reached, this layer structure shrinks or melts, and then the fire-fighting medium overflows outside the bin body;

[0046] In this embodiment, seal members 302 are provided on both opposite side plates of the fire-fighting medium storage bin 300. Compared with the setting method of only providing one seal member 302 on the side wall, the fire-fighting medium can enter the inner cavity of the battery cell or the inner cavity of the battery pack more smoothly, and the fire-fighting effect is better.

[0047] Embodiment 2

[0048] Such as Figure 2 And Figure 3As shown in the figure, this embodiment discloses a large-capacity battery, which includes a box body 100, battery cells 200, and a fire-fighting medium storage bin 300;

[0049] There are multiple battery cells 200; the multiple battery cells 200 are arranged side by side in the box body. The inner cavity of the battery cell 200 has an electrolyte area and a gas area; the electrolyte areas in the inner cavities of the battery cells 200 communicate with each other, so that each battery cell 200 is in a shared electrolyte system; because each battery cell is in a shared electrolyte system, the electrolyte consumption of each battery cell can always remain basically the same, ensuring the consistency of each battery cell and improving the cycle life of the large-capacity battery;

[0050] Avoidance holes are provided on the top plate of the box body 100 corresponding to the polar terminals of each battery cell 200; the polar terminals of each battery cell 200 extend out of the avoidance holes, and the area of the top plate of the box body 100 corresponding to the avoidance holes is fixedly sealed with the shell of the battery cell 200;

[0051] The positive terminals of all the battery cells 200 are connected as the total positive electrode, and the negative terminals of all the battery cells 200 are connected as the total negative electrode;

[0052] The fire-fighting medium storage bin 300 is installed in the box body. The bin body 301 of the fire-fighting medium storage bin 300 is filled with a fire-fighting medium. At least one seal 302 is provided on the bin body 301. After the seal 302 melts at a set temperature, a release hole for the fire-fighting medium to overflow into the box body is formed.

[0053] Since a fire-fighting medium storage bin 300 is provided in the large-capacity battery, when the temperature reaches the set temperature, the seal 302 is melted, the release hole on the fire-fighting medium storage bin 300 is opened, and the fire-fighting medium overflows into the inner cavity of the large-capacity battery box body. Due to the action of the fire-fighting medium in the shared electrolyte system, it can not only inhibit the occurrence of thermal runaway, but also when a certain battery cell has a thermal runaway, the fire-fighting medium can also inhibit the spread of thermal runaway.

[0054] A liquid injection / liquid replenishment / liquid replacement interface 700 for injecting, replenishing, and replacing liquid in the large-capacity battery is also provided on the box body 100;

[0055] In this embodiment, the fire-fighting medium storage bin 300 is placed between two adjacent battery cells 200 located in the middle of the box body 100, and there are three purposes:

[0056] 1. The probability of thermal runaway occurring in each battery cell within a large-capacity battery is basically the same. Before thermal runaway occurs, the temperature of the battery cell will rapidly increase. When the fire extinguishing medium storage bin is placed between two adjacent battery cells in the middle of the box body, compared with placing the fire extinguishing medium storage bin in other positions of the box body, the temperature of the battery cell at any position can be transferred to the fire extinguishing medium storage bin at a better speed, and the seal on the fire extinguishing medium storage bin melts quickly, improving the sensitivity.

[0057] 2. The fire extinguishing medium in the fire extinguishing medium storage bin can flow to both ends of the box body evenly and in basically the same time and act on each battery cell.

[0058] 3. In this embodiment, the fire extinguishing medium storage bin is placed side by side with each battery cell. Compared with placing the fire extinguishing medium storage bin in other positions, the structure of the large-capacity battery can be made more compact.

[0059] The battery cell in this embodiment is similar in structure to a square aluminum lithium-ion battery. Specifically, as Figure 4 shown, the battery cell 100 includes a housing 1, an electrode assembly, and a first sealed opening member 2;

[0060] The housing 1 is a component for forming the internal environment of the battery cell 100. Among them, 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 cuboid, etc. Specifically, the shape of the housing 1 can be determined according to the specific shape and size of the electrode assembly.

[0061] The form of the housing 1 can be the following two types:

[0062] 1. The housing 1 includes a top cover 11 and an outer shell 12 with an open top; the positive terminal 3 and negative terminal 4 of the battery cell are arranged on the top cover 11; the top cover 11 is sealed and installed on the outer shell 12 with an open top, and a first sealed opening member 2 is arranged at the bottom of the outer shell 12;

[0063] 2. The housing 1 includes a top cover 11, a bottom cover 13, and an outer shell 12 with both top and bottom open; the positive terminal 3 and negative terminal 4 of the battery cell are arranged on the top cover 11; the top cover 11 is sealed and installed on the top opening of the outer shell 12, the bottom cover 13 is sealed and installed on the bottom opening of the outer shell 12, and a first sealed opening member 2 is arranged on the bottom cover 13.

[0064] The first sealed opening member 2 can be opened under external force to form a liquid hole on the battery cell housing. The first sealed opening member 2 can select the sealing mechanism disclosed in Chinese Patent No. CN219457981 U, or select the sealing mechanism disclosed in Chinese Patent No. CN117810623A.

[0065] The first sealed opening member 2 can be installed on the battery cell housing in advance during the battery cell manufacturing process, or the finished battery cell can be modified by first opening a liquid hole in the finished battery cell and then installing the first sealed opening member at the liquid hole.

[0066] The electrode assembly is a component in the battery cell where electrochemical reactions occur. The housing can contain one or more electrode assemblies. The electrode assembly is also provided with tabs. During the charging and discharging process of the battery, the positive active material and the negative active material react with the electrolyte. The electrode assembly is made by winding or stacking multiple layers of electrode sheets, and each layer of electrode sheet consists of a positive electrode sheet, a separator, and a negative electrode sheet.

[0067] In this embodiment, the shape, outer dimensions, and material of the fire-fighting medium storage bin 300 are the same as those of the battery cell housing, aiming to facilitate the processing and manufacturing of the fire-fighting medium storage bin and save costs. In some other embodiments, some other materials that are insoluble in the electrolyte and whose strength and high-temperature resistance can meet the usage requirements can also be used. In this embodiment, since the battery cell is a square aluminum lithium-ion battery, the fire-fighting medium storage bin is also made of aluminum material.

[0068] The forms of the box body of the large-capacity battery are as follows:

[0069] First, the box body 100 includes a cylindrical body, a first cover plate, and a second cover plate; both the top and bottom of the cylindrical body are open, the first cover plate is hermetically fixed (welded) to the top of the cylindrical body, and the second cover plate is hermetically fixed (welded) to the bottom of the cylindrical body;

[0070] The first cover plate is provided with a plurality of pole post avoidance holes for the polar terminals of multiple battery cells to protrude, and a groove serving as an electrolyte communication channel 500 is integrally formed on the second cover plate.

[0071] Second, the box body 100 includes a U-shaped housing, a first cover plate, a third cover plate, and a fourth cover plate; the top, front, and rear of the U-shaped housing are all open, the first cover plate is hermetically fixed (welded) to the top of the U-shaped housing, and the third cover plate and the fourth cover plate are respectively hermetically fixed (welded) to the front and rear of the U-shaped housing.

[0072] The first cover plate is provided with a plurality of pole post avoidance holes for the polar terminals of multiple battery cells to protrude, and a groove serving as an electrolyte communication channel 500 is integrally formed on the bottom of the U-shaped housing.

[0073] Third, the box body 100 includes a cylindrical body, a third cover plate, and a fourth cover plate; the front and rear of the cylindrical body are both open, the third cover plate is hermetically fixed (welded) to the front of the cylindrical body, and the fourth cover plate is hermetically fixed (welded) to the rear of the cylindrical body;

[0074] The top of the cylinder body is provided with a plurality of pole post avoidance holes for the polar terminals of a plurality of battery cells to protrude, and a groove serving as an electrolyte communication channel 500 is integrally formed at the bottom of the cylinder body.

[0075] In the boxes of the above three methods, the cylinder body and the U-shaped housing can be spliced by welding, or can be integrally formed by casting, stamping or other methods. In order to facilitate processing and ensure the sealing performance, the integrally formed method is usually selected.

[0076] In order to ensure the sealing performance of the box, it is necessary to fixedly seal the area of the box corresponding to the pole post avoidance hole with the battery cell housing; the following three methods can be used for the fixed seal here:

[0077] Method 1: The edge of the pole post avoidance hole can be welded to the top cover of the battery cell to achieve sealing;

[0078] However, if the dimensions of each battery cell in the height direction are not completely equal, there may be problems of poor welding or even inability to weld between the top cover of some battery cells with smaller dimensions in the height direction and the top of the box. Method 2 or Method 3 described below can be used.

[0079] Method 2: A weak part is set in the peripheral area of the pole post avoidance hole. During the welding process, through the deformation of the weak part, the dimensional difference of the tops of the battery cell housings in the height direction is compensated, so that the polar terminals of all battery cells protrude from the pole post avoidance holes. The weak part in this embodiment can be an annular groove opened along the peripheral area of the pole post avoidance hole with the center of the pole post avoidance hole as the center point. In other embodiments, the weak part can also be a strip-shaped groove opened in the peripheral area of the pole post avoidance hole. In other embodiments, if there are similar problems, that is, the polar terminals of all battery cells cannot completely protrude from the pole post avoidance holes at the same time, the solution of adding a weak part in the peripheral area of the pole post avoidance hole can be adopted.

[0080] Method 3: A hollow connecting piece is added between the pole post avoidance hole and the polar terminal; the bottom of the hollow connecting piece is used for sealing connection with the first area of the battery cell, and the top of the hollow connecting piece is sealedly connected with the second area of the box; the first area is the area around any polar terminal in any battery cell; the second area is the area corresponding to any pole post avoidance hole on the box. The area corresponding to the pole post avoidance hole is the peripheral area on the outer surface of the top of the box corresponding to any pole post avoidance hole; or the area corresponding to the pole post avoidance hole is the wall of the pole post avoidance hole. Among them, the area around the pole post avoidance hole is the area around the insulating gasket on the pole post avoidance hole. The insulating gasket is a part on the battery cell for insulating between the pole post avoidance hole and the top cover.

[0081] Embodiment 3

[0082] Such as Figure 5 And Figure 6As shown in the figure, this embodiment is based on Embodiment 2. For the large-capacity battery, a gas communication channel 400 is added, and the gas areas of each battery cell are connected through the gas communication channel 400, so that each battery cell is in the same air pressure environment. At the same time, an electrolyte communication channel 500 is added to make the continuity of the electrolyte liquid level better when the electrolyte areas of each battery cell are connected (to avoid the situation of liquid breakage).

[0083] In order to enable each battery cell 200 to be connected through the gas communication channel 400, in this embodiment, a second sealed opening member 5 needs to be provided on the top cover of each battery cell; the structure of the second sealed opening member 5 is the same as that of the first sealed opening member 2. After the second sealed opening member 5 is opened, air holes are formed on the battery cell housing, and the gas areas of each battery cell can be connected.

[0084] The second sealed opening member 5 can be installed on the battery cell housing in advance during the manufacturing process of the battery cell, or the finished battery cell can be modified. First, air holes are opened on the finished battery cell, and then the second sealed opening member is installed at the air holes.

[0085] Moreover, the gas communication channel 400 is provided at the top of the box body. Based on the three box body forms given in Embodiment 1, the following improvements need to be made:

[0086] In the first and second box body forms: The first cover plate is integrally formed with an upwardly convex groove, and this groove serves as the gas communication channel 400.

[0087] In the third box body form: The top of the cylinder is integrally formed with an upwardly convex groove, and this groove serves as the gas communication channel 400.

[0088] Embodiment 4

[0089] See Figure 2 and Figure 5 As shown in the figure, this embodiment is an improvement based on Embodiment 2 and Embodiment 3. A heat exchange tube 600 is added to the large-capacity battery.

[0090] As Figure 7 shown, heat exchange tube installation parts 6 are provided on both the positive terminal 3 and the negative terminal 4 of each battery cell; the heat exchange tube 600 cooperates with the heat exchange tube installation parts 6 on the positive terminal 3 and the negative terminal 4 of each battery cell to transfer the temperature of the electrode assembly in each battery cell 200 from the polar terminal to the external temperature control device, reducing the problem that the overheating of the electrode assembly will affect the performance of the large-capacity battery. More importantly, the direct temperature control of each electrode assembly reduces the probability of thermal runaway, thereby improving safety.

[0091] Specifically, the heat exchange tube installation part 6 in the present utility model has two forms:

[0092] Method 1: Through holes are provided in the positive terminal 3 and the negative terminal 4. The aperture size of the through holes needs to ensure that the heat exchange tube is tightly clamped therein, so as to ensure the installation stability and at the same time ensure the heat transfer effect between the heat exchange tube and the polar terminal.

[0093] Method 2: Grooves are provided on the top or side wall of the positive terminal 3 and the negative terminal 4; the width size of the grooves needs to ensure that the heat exchange tube is tightly clamped therein, so as to ensure the installation stability and at the same time ensure the heat transfer effect between the heat exchange tube and the pole column.

[0094] Since the positive terminal 3 and the negative terminal 4 of the battery cell are charged, in order to ensure safety, insulation must be maintained between the heat exchange tube and the positive terminal 3 and the negative terminal 4 of the battery cell. The way to maintain insulation can be to oxidize the heat exchange tube or to set an insulating layer in the area where the heat exchange tube contacts the polar terminal.

[0095] Specifically, the heat exchange tube 600 can adopt the following methods:

[0096] 1. Use an aluminum tube bent into a U-shaped structure, and use two parallel tube sections 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 outlet of the aluminum tube are located on the same side; the medium transmitted in the aluminum tube can be water, insulating oil or fluorinated liquid; two aluminum tubes can also be used to cooperate with the total positive electrode and the total negative electrode respectively.

[0097] 2. Use two heat pipes with cores 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 heat pipe with a core is an evaporation-condensation type heat exchange device, and the heat transfer is realized by the state change of the working medium in the tube.

[0098] Since the heat transfer effect of the heat pipe with a core is affected by the length of the heat pipe with a core, when the number of battery cells in a large-capacity battery is large (that is, the length of the large-capacity battery is long), the use of the heat pipe with a core will be limited. Therefore, in this embodiment, an aluminum tube is preferably selected as the heat exchange tube. If the insulation between the heat exchange tube and the polar terminal can be effectively ensured, considering the heat transfer efficiency, cost, etc., water can be preferably used as the heat transfer medium flowing in the aluminum tube.

Claims

1. A large capacity battery, characterized in that: It includes a box body, a battery cell and a fire-fighting medium storage bin; There are multiple battery cells, which are arranged side by side in the box. The inner cavity of the battery cell has an electrolyte area and a gas area. The electrolyte areas in the inner cavities of the battery cells are interconnected, so that the battery cells are in a shared electrolyte system. 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 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 fire-fighting medium storage bin is installed in the box body, and the bin body of the fire-fighting medium storage bin is filled with fire-fighting medium. At least one seal is arranged on the bin body of the fire-fighting medium storage bin, and the seal melts at a set temperature to form a release hole for the fire-fighting medium to overflow into the box body.

2. A large capacity battery according to claim 1, characterized in that: Seals are provided on two opposite side panels of the fire-fighting medium storage bin.

3. A large capacity battery according to claim 1 or 2, characterized in that: The sealing member is a polyethylene layer.

4. A large capacity battery according to claim 3, characterized in that: The fire-fighting medium filled in the fire-fighting medium storage bin is perfluorohexanone.

5. A large capacity battery according to claim 1, characterized in that: The fire-fighting medium storage bin is placed between two adjacent battery cells located in the middle of the box body; sealing members are provided at the top and the bottom of the fire-fighting medium storage bin.

6. A large capacity battery according to claim 5, characterized in that: The dimensions and materials of the fire-fighting medium storage bin are consistent with those of the battery cell shell.

7. A large capacity battery according to claim 5 or 6, characterized in that: The top of the box body is provided with a gas communication channel for connecting the gas areas of each battery monomer.

8. A large capacity battery according to claim 7, characterized in that: The bottom of the box is provided with an electrolyte communication channel.

9. A large capacity battery according to claim 8, characterized in that: It also includes a heat exchange tube; the heat exchange tube cooperates with the heat exchange tube mounting portion of each battery cell polarity terminal.

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