Battery cell explosion-proof method and device

Abstract

The invention provides an anti-explosion method and device for a battery cell, and belongs to the technical field of energy storage battery cells, the battery cell comprises a discharge port, the anti-explosion device for the battery cell comprises an anti-explosion valve, the anti-explosion valve is used for sealing the discharge port of the battery cell, and the method comprises the following steps: acquiring operation data of the battery cell; judging whether the operation data of the battery cell is greater than or equal to a preset data threshold value or not; and if yes, breaking the explosion-proof valve from the outside of the battery cell, and communicating the inner space and the outer space of the battery cell through the leakage port. When the battery cell operates abnormally, the explosion-proof valve is broken from the outside of the battery cell, and the inner space and the outer space of the battery cell are communicated, so that heat in the battery cell is released in advance, fire and explosion caused by continuous accumulation of the heat in the battery cell are avoided, and the explosion-proof valve is broken from the outside, so that the situation that the battery cell is damaged due to the abnormal interior of the battery cell can be avoided. Therefore, the problem that the explosion-proof valve cannot be broken from the inside of the battery cell is solved, and more comprehensive protection is provided for the safety of the battery cell.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage battery cells, and in particular to a battery cell explosion-proof method and device. Background Art

[0002] With the rapid development of energy storage technology, the safety of energy storage equipment has also received great attention in the industry, especially the safety of energy storage cells. For an energy storage power station, there are usually hundreds or thousands of cells piled up in a container. If a cell has a short circuit or other fault, it may cause the cell to heat up. If the heat continues to accumulate, it may catch fire or even explode, threatening the safety of the entire container or even the energy storage power station. Summary of the invention

[0003] In view of this, an object of the present invention is to overcome the deficiencies in the prior art and to provide a method and device for explosion-proofing a battery cell, which can break the explosion-proof valve of the battery cell from the outside of the battery cell when the battery cell operates abnormally, so as to prevent the continuous accumulation of heat inside the battery cell from causing fire and explosion of the battery cell.

[0004] In a first aspect, the present application provides a method for preventing an explosion of a battery cell, which is applied to a battery cell explosion-proof device, wherein the battery cell includes a discharge port, the battery cell explosion-proof device includes an explosion-proof valve, and the explosion-proof valve is used to seal the discharge port of the battery cell, and the method includes:

[0005] Acquiring operating data of the battery cell;

[0006] Determine whether the operating data is greater than or equal to a preset data threshold;

[0007] If so, the explosion-proof valve is ruptured from the outside of the battery cell to connect the inner and outer spaces of the battery cell through the drain port.

[0008] In one embodiment, the battery cell explosion-proof device includes an active trigger module, and the step of breaking the explosion-proof valve from outside the battery cell includes:

[0009] Through a preset trigger control operation, the active trigger module is controlled to rupture the explosion-proof valve from outside the battery cell.

[0010] In one embodiment, the active trigger module includes an explosion-proof valve protective film and a trigger device, and the preset trigger control operation is used to control the active trigger module to break the explosion-proof valve from the outside of the battery cell, including:

[0011] Applying a trigger pressure to the explosion-proof valve protective film from the outside of the battery cell through the preset trigger control operation;

[0012] The trigger device is controlled by the trigger pressure to rupture the explosion-proof valve from outside the battery cell.

[0013] In one embodiment, the battery cell explosion-proof device further includes a booster module, the battery cell is sealed in a housing, and the trigger pressure is applied to the explosion-proof valve protective film from the outside of the battery cell through the preset trigger control operation, including:

[0014] Controlling the boost module to inject pressurized gas into the space between the housing and the battery cell;

[0015] A triggering pressure is applied to the explosion-proof valve protective membrane from outside the battery cell through the pressurized gas.

[0016] In one embodiment, controlling the boost module to inject pressurized gas into the space between the housing and the battery cell includes:

[0017] Acquiring air pressure data inside the battery cell, and determining a target pressure of the space according to the air pressure data;

[0018] The boosting module is controlled to inject the pressurized gas corresponding to the target pressure into the interval space.

[0019] In one embodiment, controlling the trigger device to break the explosion-proof valve from outside the battery cell by the trigger pressure includes:

[0020] converting the explosion-proof valve protective film from an initial shape to a special-shaped shape by the pressurized gas;

[0021] The trigger device is controlled by the special-shaped explosion-proof valve protection film to break the explosion-proof valve from the outside of the battery cell.

[0022] In one embodiment, the operating data includes voltage data and temperature data of the battery cell, the preset data threshold includes a voltage threshold and a temperature threshold, and the determining whether the operating data of the battery cell is greater than or equal to the preset data threshold includes:

[0023] If the voltage data is greater than or equal to the voltage threshold, and the temperature data is greater than or equal to the temperature threshold, it is determined that the operation data of the battery cell is greater than or equal to a preset data threshold.

[0024] In one embodiment, the number of the battery cells is at least two, and the method further comprises:

[0025] If the operating data of any one of the at least two battery cells exceeds the preset data threshold, the explosion-proof valve corresponding to each battery cell is ruptured from the outside of each battery cell to connect the inner and outer spaces of each battery cell through the corresponding discharge port of each battery cell.

[0026] In a second aspect, the present application provides a battery cell explosion-proof device, comprising an explosion-proof valve and a control module, wherein the battery cell comprises a discharge port, and the explosion-proof valve is used to seal the discharge port of the battery cell;

[0027] The control module is used to obtain the operating data of the battery cell and determine whether the operating data is greater than or equal to a preset data threshold; if so, the explosion-proof valve is opened from the outside of the battery cell to connect the inner and outer spaces of the battery cell through the drain port.

[0028] In one embodiment, the battery core explosion-proof device further includes an explosion-proof valve protective film and a trigger device;

[0029] The control module is further used to apply a trigger pressure to the explosion-proof valve protective film from the outside of the battery cell through a preset trigger control operation;

[0030] The trigger device is used to break the explosion-proof valve from the outside of the battery cell under the action of the trigger pressure.

[0031] The embodiments of the present invention have the following beneficial effects:

[0032] The battery cell explosion-proof method and device provided by the present invention determine whether the operation data of the battery cell is greater than or equal to a preset data threshold value, thereby determining whether the operation of the battery cell is abnormal. If the operation is abnormal, the explosion-proof valve of the battery cell is broken from the outside of the battery cell, and the inner and outer spaces of the battery cell are connected through the leakage port, thereby releasing the heat inside the battery cell in advance, avoiding continuous accumulation of heat inside the battery cell to cause fire and explosion, and breaking the explosion-proof valve from the outside of the battery cell can avoid the problem that the explosion-proof valve cannot be opened normally to the outside of the battery cell due to the abnormality inside the battery cell, thereby providing more comprehensive protection for the safety of the battery cell.

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 A schematic diagram of a process flow of a battery cell explosion-proof method provided in an embodiment of the present application;

[0036] Figure 2 A schematic diagram of the principle of a battery cell explosion-proof method provided in an embodiment of the present application;

[0037] Figure 3 A schematic diagram of the change of battery cell operation data over time in the prior art;

[0038] Figure 4 A schematic diagram of a partial structure of a battery cell explosion-proof device provided in an embodiment of the present application;

[0039] Figure 5 A schematic diagram of a partial structure of another battery cell explosion-proof device provided in an embodiment of the present application;

[0040] Figure 6 A schematic diagram of the framework structure of a battery cell explosion-proof device provided in an embodiment of the present application.

[0041] Description of main component symbols:

[0042] 10. Shell; 100. Battery cell; 200. Drain port; 300. Explosion-proof valve; 400. Explosion-proof valve protective film; 500. Trigger device; 600. Battery cell explosion-proof device; 700. Control module. DETAILED DESCRIPTION

[0043] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0044] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of the template are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0046] Example 1

[0047] See also Figure 1 , is a flow chart of a method for preventing battery cell explosions provided in this embodiment. The method is applied to a battery cell explosion-proof device to prevent fire and explosion caused by continuous accumulation of heat inside the battery cell. The method includes steps S101-S103.

[0048] See also Figure 2 , Figure 2 A schematic diagram of the principle of the battery cell explosion-proof method provided in this embodiment.

[0049] The battery cell explosion-proof device mainly acts on the battery cell 100 to prevent the battery cell 100 from exploding. Figure 2 As shown, the battery cell explosion-proof device mainly includes an explosion-proof valve 300, an explosion-proof valve protective film 400 and a trigger device 500. The explosion-proof valve 300 is arranged at the leakage port 200 of the battery cell 100, and is used to seal the leakage port 200, and to break the valve when the temperature or pressure inside the battery cell is high. The explosion-proof valve protective film 400 covers the explosion-proof valve 300, and the trigger device 500 is arranged between the explosion-proof valve protective film 400 and the explosion-proof valve 300.

[0050] Usually, each battery cell 100 is provided with a discharge port 200 and an explosion-proof valve 300. When a short circuit or other fault occurs inside the battery cell 100, the air pressure or temperature inside the battery cell 100 will rise. When a certain threshold is reached, the explosion-proof valve 300 will open to the outside of the battery cell under the action of the air pressure or temperature inside the battery cell 100, so that the high-temperature gas inside the battery cell 100 flows out to the outside of the battery cell through the discharge port 200, thereby preventing the heat inside the battery cell 100 from continuing to rise, causing the battery cell to catch fire and explode.

[0051] Combine the following Figure 1-Figure 2 The explosion-proof method of the battery cell of this embodiment is described.

[0052] S101, obtaining operation data of the battery cell.

[0053] In order to determine whether the operation of the battery cell 100 is abnormal, it is necessary to obtain the operation data of the battery cell 100 in real time or at a certain period, and a battery management system (BMS) can usually be selected to obtain and detect the operation data of the battery cell 100. The BMS is mainly for intelligent management and maintenance of each battery unit, monitoring the battery status, preventing the battery from overcharging and over-discharging, and extending the battery life.

[0054] Since the explosion-proof device is mainly used to prevent the battery cell 100 from exploding, the operation data obtained are mainly the relevant data that may cause the battery cell 100 to explode, and the explosion of the battery cell 100 is usually caused by a short circuit in the battery cell 100. For example, when the battery cell 100 is short-circuited, if the battery cell 100 is in a charging state, the voltage and temperature of the battery cell 100 may continue to rise, the battery cell components may heat up, and in this process, high-temperature gas may be generated, causing the temperature and pressure inside the battery cell 100 to gradually increase. Therefore, the operation data may mainly include the voltage data, temperature data, and pressure data of the battery cell 100. Users may also collect other relevant data of the battery cell 100 as needed to determine whether the battery cell has the risk of fire and explosion.

[0055] S102: Determine whether the operating data is greater than or equal to a preset data threshold.

[0056] After obtaining the relevant operation data that may cause the battery cell 100 to catch fire or explode, it is determined whether the operation data exceeds the preset data threshold, which can be set according to the data when the battery cell is working normally. When the battery cell 100 is in different working environments or working states, the data of the normal working of the battery cell 100 may fluctuate. Therefore, in order to avoid misjudgment, the corresponding preset data threshold can be set according to the working environment or working state of the battery cell 100.

[0057] S103: If yes, rupture the explosion-proof valve from the outside of the battery cell to connect the inner and outer spaces of the battery cell through the drain port.

[0058] If the operating data of the battery cell 100 exceeds the preset data threshold, it can be determined that the risk of fire and explosion of the battery cell 100 is high. Since the battery cells 100 are usually stacked in large quantities in energy storage power stations and other scenarios, the fire and explosion of one battery cell 100 will also bring greater safety hazards to other battery cells 100. Therefore, in order to reduce losses, it is necessary to destroy the faulty battery cell and release the high-temperature gas inside it in advance to avoid the temperature inside the faulty battery cell continuing to rise, causing fire and explosion, and causing a chain reaction in other battery cells.

[0059] Although the common battery cell explosion-proof valves on the market can break when the temperature or pressure inside the battery cell 100 is high to release the high-temperature gas inside the battery cell 100, for the sealing and stability of the battery cell 100, the temperature or pressure required for the explosion-proof valve 300 to break is generally high. Under high temperature or pressure, the internal components of the battery cell 100 may have deformed or melted, which may easily lead to the explosion-proof valve 300 failing to break normally. Moreover, during the use of the explosion-proof valve 300, the explosion-proof valve 300 may also age, or be corroded by the electrolyte, affected by the environment, etc. These factors may also lead to the explosion-proof valve 300 failing to break normally.

[0060] Therefore, in order to reduce the risk of explosion of the battery core 100, the preset data threshold can be set lower than the valve breaking threshold of the explosion-proof valve 300.

[0061] See also Figure 3 , Figure 3 This is a schematic diagram showing how the operating data of the battery cell in the existing explosion-proof solution changes over time.

[0062] like Figure 3 As shown, point A is the breaking point of the explosion-proof valve of the battery cell in the existing explosion-proof solution. At point A, when the voltage and temperature of the battery cell 100 are already at a relatively high level, the high temperature or high pressure inside the battery cell causes the explosion-proof valve 300 to break. At this time, although the explosion-proof valve 300 has broken, there is still a risk of explosion due to the relatively high voltage and temperature inside the battery cell 100.

[0063] For example, the temperature range of the battery cell 100 during normal operation is -30-60 degrees, while in the prior art, the bursting temperature of the explosion-proof valve 300 may be 80 degrees. If the temperature reaches 80 degrees and then the valve bursts, the risk of fire and explosion of the battery cell 100 is still relatively high.

[0064] In order to reduce the risk of fire and explosion of the battery cell 100, the battery cell explosion-proof method provided in this embodiment can set the preset data threshold to about 70 degrees. When the temperature inside the battery cell reaches about 70 degrees, the explosion-proof valve 300 is broken from the outside of the battery cell to achieve early breaking of the explosion-proof valve 300, so that when the internal and external spaces of the battery cell are connected, the temperature, voltage or pressure inside the battery cell is still in a relatively safe range.

[0065] Similarly, if the preset data threshold is the voltage threshold of the battery cell 100 or the temperature threshold inside the battery cell, it can also be set in the same way, and the voltage threshold and the temperature threshold can be set to be lower than the valve breaking voltage or the valve breaking temperature of the explosion-proof valve 300, so as to achieve the explosion-proof valve 300 breaking in advance before the valve breaking requirement of the explosion-proof valve 300 is met.

[0066] The user can also set the corresponding valve breaking threshold according to the needs. For example, the highest temperature of the normal working of the battery cell 100 is set as the first threshold, the valve breaking temperature of the explosion-proof valve 300 is set as the second threshold, and the temperature when the explosion-proof valve 300 is actively punctured is set as the preset data threshold, and the first threshold < the preset data threshold < the second threshold, so that the explosion-proof valve 300 can be actively broken in advance when the battery cell 100 is abnormal.

[0067] Similarly, the maximum voltage for normal operation of the battery cell 100 can be set to a first threshold, the valve breaking voltage of the explosion-proof valve 300 can be set to a second threshold, the voltage when the explosion-proof valve 300 is actively punctured can be set to a preset data threshold, and the first threshold < preset data threshold < second threshold can be made, so that when the battery cell 100 is abnormal, the explosion-proof valve 300 can be actively punctured in advance.

[0068] Alternatively, the maximum pressure for normal operation of the battery cell 100 is set to a first threshold, the bursting pressure of the explosion-proof valve 300 is set to a second threshold, the pressure for actively puncturing the explosion-proof valve 300 is set to a preset data threshold, and the first threshold is < the preset data threshold < the second threshold, so that the explosion-proof valve 300 can be actively punctured in advance when the battery cell 100 is abnormal.

[0069] This embodiment can determine whether the battery cell is abnormal based on the battery cell operation data, such as the temperature, voltage and pressure of the battery cell. If so, the explosion-proof valve is broken from the outside of the battery cell, which can not only realize the early release of the high-temperature gas inside the battery cell and prevent the battery cell from catching fire and exploding due to high temperature, but also avoid the problem in the prior art that the explosion-proof valve cannot be broken normally from the inside of the battery cell due to battery cell failure, thereby improving the safety of the battery cell.

[0070] In one embodiment, the preset data threshold includes a voltage threshold and a temperature threshold, and the determining whether the operating data of the battery cell is greater than or equal to the preset data threshold includes:

[0071] If the voltage data is greater than or equal to the voltage threshold, and the temperature data is greater than or equal to the temperature threshold, it is determined that the operation data of the battery cell is greater than or equal to a preset data threshold.

[0072] The detection of voltage data and temperature data inside the battery cell can be performed through the BMS. However, in some cases, the BMS may also have false alarms. In order to reduce unnecessary losses caused by false alarms, it can be determined from multiple aspects whether the battery cell 100 is in an abnormal state.

[0073] For example, when the BMS detects that the voltage data of the battery cell 100 is greater than or equal to the voltage threshold, it then detects the temperature data of the battery cell to determine whether the temperature data is also greater than or equal to the temperature threshold. If the voltage data is greater than or equal to the voltage threshold, but the temperature data is less than the temperature threshold, it means that there may be a false alarm. At this time, it is necessary to issue a corresponding alarm message to ask relevant staff to check and confirm the working status of the corresponding battery cell.

[0074] Alternatively, the voltage data and the temperature data are detected at the same time. When only one of the voltage data and the temperature data is abnormal, other data of the battery cell 100, such as the pressure data, is detected. If the pressure data is also abnormal, the battery cell 100 is regarded as an abnormal battery cell. The user can also detect other battery cell operating parameters according to actual conditions to ensure that the battery cell 100 is not damaged due to erroneous reporting by the BMS, which can also improve the safety of the battery cell 100.

[0075] In one embodiment, the battery cell explosion-proof device includes an active trigger module, and the step of breaking the explosion-proof valve from outside the battery cell includes:

[0076] Through a preset trigger control operation, the active trigger module is controlled to rupture the explosion-proof valve from outside the battery cell.

[0077] The explosion-proof valve 300 of the battery cell can only break when the temperature or pressure inside the battery cell reaches a relatively high level, such as when the pressure inside the battery cell reaches about 0.4-0.8MPa, which is equivalent to a passive valve breaking process. Moreover, when the temperature inside the battery cell is high, a fire may have already occurred. At this time, breaking the valve may not solve the actual problem, and the battery cell 100 still has the risk of explosion. However, by using an active trigger module to puncture the explosion-proof valve 300 from the outside of the battery cell, the valve can be broken in advance when the temperature or pressure inside the battery cell 100 is in a relatively safe range, so that the high-temperature gas inside the battery cell 100 is released in advance, which can prevent the continuous accumulation of high-temperature gas from causing fire and explosion.

[0078] In one embodiment, the active trigger module includes an explosion-proof valve protective film 400 and a trigger device 500, and the preset trigger control operation is used to control the active trigger module to break the explosion-proof valve from the outside of the battery cell, including:

[0079] A trigger pressure is applied to the explosion-proof valve protection membrane from outside the battery cell through the preset trigger control operation.

[0080] The trigger device is controlled by the trigger pressure to rupture the explosion-proof valve from outside the battery cell.

[0081] like Figure 2 As shown, the explosion-proof valve 300 is arranged at the discharge port 200 of the battery cell, which can not only seal the battery cell 100, but also break the valve when the temperature inside the battery cell 100 reaches the valve breaking requirement, so that the inside of the battery cell 100 and the outside of the battery cell are connected through the discharge port 200, thereby discharging the high-temperature gas inside the battery cell to the outside of the battery cell, avoiding the continuous accumulation of high-temperature gas inside the battery cell and causing explosion.

[0082] The explosion-proof valve protective film 400 is arranged above the explosion-proof valve 300. The traditional explosion-proof valve protective film 400 is mainly used to prevent external dust from falling on the explosion-proof valve 300. In addition to setting an explosion-proof valve protective film 400 on the explosion-proof valve 300, this embodiment also provides an additional trigger device 500 between the explosion-proof valve protective film 400 and the explosion-proof valve 300. The trigger device 500 is used to break the explosion-proof valve 300 from the outside of the battery cell through the trigger device 500 under specific circumstances. The trigger device 500 can be bonded to the explosion-proof valve protective film 400.

[0083] In order to make it easier to break the explosion-proof valve 300 from the outside of the battery cell, the trigger device 500 can be set to a convex shape, such as a spire shape, a triangular cone shape, or a needle tip shape, etc., or it can be set to other shapes that are easy to pierce the explosion-proof valve. Then, by applying a preset trigger control operation to the explosion-proof valve protective film 400, the trigger device 500 can break the explosion-proof valve 300 from the outside of the battery cell.

[0084] In this embodiment, a trigger device 500 is provided outside the battery cell. When an abnormality occurs inside the battery cell 100, the explosion-proof valve 300 can be broken from the outside of the battery cell through the trigger device 500, thereby breaking the explosion-proof valve 300 in advance and reducing the risk of fire and explosion of the battery cell 100.

[0085] In one embodiment, the battery cell explosion-proof device further includes a booster module, the battery cell is sealed in a housing, and the trigger pressure is applied to the explosion-proof valve protective film from the outside of the battery cell through the preset trigger control operation, including:

[0086] Controlling the boost module to inject pressurized gas into the space between the housing and the battery cell;

[0087] A triggering pressure is applied to the explosion-proof valve protective membrane from outside the battery cell through the pressurized gas.

[0088] like Figure 2 As shown, a shell 10 is further provided on the outside of the battery cell 100. The shell 10 is a sealed shell, such as a common battery or battery pack, in which the battery cell 100 is encapsulated by the shell 10 to prevent the battery cell 100 from directly contacting the external environment. It can also play a role in protecting the battery cell during transportation and the like.

[0089] In view of different design requirements or application requirements of energy storage devices, the number of battery cells 100 in different types of energy storage devices is also different. For different numbers of battery cells 100, different shells 10 can be selected to package the battery cells 100. For example, when the number of battery cells 100 is one or a small number, a battery shell can be selected to package all the battery cells 100. When the number of battery cells 100 is large, a battery pack shell can be selected to package all the battery cells 100.

[0090] Since the battery cell 100 itself is a sealed structure and the shell 10 is also a sealed structure, the trigger pressure can be applied to the explosion-proof valve protective film 400 corresponding to the battery cell 100 by gas pressurization. In order to prevent the battery cell 100 from catching fire and exploding, the injected gas can be a fire-fighting gas, such as aerosol or perfluorohexanone. The user can also choose other methods to apply trigger pressure to the explosion-proof valve protective film 400 according to actual conditions, thereby achieving early rupture of the explosion-proof valve 300.

[0091] When gas pressurization is performed on energy storage devices of different types, the principle of pressurization is the same. If the energy storage device is a battery, pressurized gas is injected into the space between the battery shell and the battery cell 100, thereby applying trigger pressure to the explosion-proof valve protective film 400 corresponding to the battery cell 100. If the energy storage device is a battery pack, pressurized gas is injected into the space between the battery pack shell and the battery cell 100, thereby applying trigger pressure to the explosion-proof valve protective film 400 corresponding to the battery cell 100.

[0092] In this embodiment, firefighting gas is injected into the shell to pressurize the explosion-proof valve protective film and the trigger device, thereby achieving early rupture of the explosion-proof valve, so that the high-temperature gas inside the battery cell is released in advance. In addition, the firefighting gas can further reduce the risk of battery cell fire.

[0093] In one embodiment, controlling the boost module to inject pressurized gas into the space between the housing and the battery cell includes:

[0094] The air pressure data inside the battery cell is obtained, and the target pressure of the space is determined according to the air pressure data.

[0095] The boosting module is controlled to inject the pressurized gas corresponding to the target pressure into the interval space.

[0096] When firefighting gas is used to apply pressure to the trigger device 500 so that the trigger device 500 pierces the explosion-proof valve 300, the air pressure inside the battery cell 100 may increase due to the abnormal condition of the battery cell 100. If the amount of firefighting gas injected is insufficient, the trigger device 500 may not be able to pierce the explosion-proof valve normally due to the small pressure difference between the inside and outside of the battery cell. Therefore, it is necessary to first obtain the internal air pressure data of the battery cell 100, and then determine the target pressure outside the battery cell based on the internal air pressure data of the battery cell 100. The target pressure is the pressure used to ensure that the trigger device can pierce the explosion-proof valve normally. Then, firefighting gas is injected into the interval space so that the air pressure in the interval space reaches the target pressure.

[0097] Since injecting firefighting gas takes a certain amount of time, the air pressure inside the battery cell may gradually increase during this process. Therefore, the acquisition of air pressure data inside the battery cell can be real-time, so as to adjust the amount of firefighting gas injected in real time according to the situation inside the battery cell.

[0098] Alternatively, the fire-fighting gas can be injected while the status of the explosion-proof valve is detected. When it is determined that the explosion-proof valve is broken, the injection can be stopped to avoid injecting too much fire-fighting gas into the shell, which will cause the gas pressure in the shell to be too high and bring new safety hazards.

[0099] In one embodiment, controlling the trigger device to break the explosion-proof valve from outside the battery cell by the trigger pressure includes:

[0100] The explosion-proof valve protection membrane is transformed from an initial shape to a special shape by the pressurized gas.

[0101] The trigger device is controlled by the special-shaped explosion-proof valve protection film to break the explosion-proof valve from the outside of the battery cell.

[0102] See also Figure 4 , Figure 4 A schematic diagram of the partial structure of a battery cell explosion-proof device provided in this embodiment.

[0103] Figure 4 The figure shows the state of the explosion-proof valve 300, the trigger device 500 and the explosion-proof valve protective film 400 in the explosion-proof device of the battery cell 100 when the battery cell 100 is in normal operation. Since the battery cell 100 is not abnormal at this time, there is no need to apply pressure to the explosion-proof valve protective film 400 and the trigger device 500. At this time, the explosion-proof valve protective film 400 is in an initial shape, which can be a flat shape. At this time, there is a gap between the trigger device 500 and the explosion-proof valve 300, and the trigger device 500 is not in direct contact with the explosion-proof valve 300.

[0104] See also Figure 5 , Figure 5 A schematic diagram of the partial structure of another battery cell explosion-proof device provided in this embodiment.

[0105] Figure 5What is shown is the state of the explosion-proof valve 300, the trigger device 500 and the explosion-proof valve protective film 400 in the explosion-proof device of the battery cell 100 under abnormal circumstances. Since the battery cell 100 is abnormal at this time, it is necessary to apply pressure to the explosion-proof valve protective film 400 to press the trigger device 500 downward so that the trigger device 500 can break the explosion-proof valve 300. Therefore, the explosion-proof valve protective film 400 at this time will be transformed from an initial shape into a special shape under the action of external pressure. The special shape can be a concave shape shown in the figure. At this time, the explosion-proof valve protective film 400 presents a downward arc, so that the trigger device 500 can directly contact the explosion-proof valve 300, and finally the explosion-proof valve 300 is broken.

[0106] In one embodiment, the number of the battery cells is at least two, and the method further comprises:

[0107] If the operating data of any one of the at least two battery cells exceeds the preset data threshold, the explosion-proof valve corresponding to each battery cell is ruptured from the outside of each battery cell, and the inner and outer spaces of each battery cell are connected through the corresponding discharge port of each battery cell.

[0108] In scenarios such as energy storage power stations, battery cells 100 usually do not exist alone, and multiple battery cells 100 are generally combined into a battery pack to meet greater energy storage or power supply needs. For a battery pack, when a battery cell 100 in the battery pack is short-circuited, the energy storage or power supply capacity of the entire battery pack will be greatly reduced, or even directly scrapped. In order to avoid fire and explosion of the entire battery pack, once there is a risk of fire and explosion in a battery pack, the explosion-proof valves corresponding to all battery cells 100 in the battery pack need to be broken in advance to control the loss within the battery pack.

[0109] Therefore, each battery cell 100 needs to be configured with a corresponding trigger device 500. Since all the battery cells 100 in a battery pack only need to be packaged with one shell 10, when breaking the explosion-proof valves 300 of all the battery cells 100, it is only necessary to inject fire-fighting gas into the shell 10 of the battery pack.

[0110] In this embodiment, when multiple battery cells are simultaneously contained in a container, such as a battery pack, if one battery cell is found to be faulty, the explosion-proof valves corresponding to all battery cells are ruptured simultaneously to control the loss within the battery pack, thus preventing the entire battery pack from catching fire and exploding.

[0111] See also Figure 6 This embodiment further provides a battery cell explosion-proof device 600, including: an explosion-proof valve 300 and a control module 700, the battery cell includes a discharge port, and the explosion-proof valve 300 is arranged at the discharge port of the battery cell;

[0112] The control module 700 is used to obtain the operating data of the battery cell and determine whether the operating data of the battery cell is greater than or equal to a preset data threshold; if so, the explosion-proof valve 300 is broken from the outside of the battery cell to connect the inner and outer spaces of the battery cell through the drain port.

[0113] In one embodiment, the battery cell explosion-proof device 600 further includes an explosion-proof valve protective film and a trigger device;

[0114] The control module 700 is further used to apply a trigger pressure to the explosion-proof valve protection film from the outside of the battery cell through the preset trigger control operation;

[0115] The trigger device is used to puncture the explosion-proof valve from the outside of the battery cell under the action of the trigger pressure.

[0116] It can be understood that the implementation of the above-mentioned battery cell explosion-proof method is also applicable to the battery cell explosion-proof device provided in this embodiment, and can achieve the same technical effect. To avoid redundancy, it will not be described again.

[0117] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limiting, and thus other examples of the exemplary embodiments may have different values.

[0118] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0119] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A method for explosion-proofing a battery cell, characterized in that: Applied to a battery cell explosion-proof device, the battery cell includes a discharge port, the battery cell explosion-proof device includes an explosion-proof valve, and the explosion-proof valve is used to seal the discharge port of the battery cell. The method includes: Acquiring operating data of the battery cell; Determine whether the operating data is greater than or equal to a preset data threshold; If so, the explosion-proof valve is ruptured from the outside of the battery cell to connect the inner and outer spaces of the battery cell through the drain port.

2. The method for preventing explosion of battery core according to claim 1, characterized in that: The battery core explosion-proof device includes an active trigger module, and the explosion-proof valve is broken from the outside of the battery core, including: Through a preset trigger control operation, the active trigger module is controlled to rupture the explosion-proof valve from outside the battery cell.

3. The method for preventing explosion of battery core according to claim 2, characterized in that: The active trigger module includes an explosion-proof valve protection film and a trigger device. The preset trigger control operation is used to control the active trigger module to break the explosion-proof valve from the outside of the battery cell, including: Applying a trigger pressure to the explosion-proof valve protective film from the outside of the battery cell through the preset trigger control operation; The trigger device is controlled by the trigger pressure to rupture the explosion-proof valve from outside the battery cell.

4. The method for preventing explosion of battery core according to claim 3, characterized in that: The battery cell explosion-proof device further includes a pressurizing module, the battery cell is sealed in a housing, and the trigger pressure is applied to the explosion-proof valve protective film from the outside of the battery cell through the preset trigger control operation, including: Controlling the boost module to inject pressurized gas into the space between the housing and the battery cell; A triggering pressure is applied to the explosion-proof valve protective membrane from outside the battery cell through the pressurized gas.

5. The method for preventing explosion of battery core according to claim 4, characterized in that: The step of controlling the boost module to inject the pressurized gas into the space between the housing and the battery cell comprises: Acquiring air pressure data inside the battery cell, and determining a target pressure of the space according to the air pressure data; The boosting module is controlled to inject the pressurized gas corresponding to the target pressure into the interval space.

6. The method for preventing explosion of a battery core according to claim 4 or 5, characterized in that: The method of controlling the trigger device to break the explosion-proof valve from outside the battery cell by the trigger pressure includes: converting the explosion-proof valve protective film from an initial shape to a special-shaped shape by the pressurized gas; The trigger device is controlled by the special-shaped explosion-proof valve protection film to break the explosion-proof valve from the outside of the battery cell.

7. The method for preventing explosion of battery core according to claim 1, characterized in that: The operation data includes voltage data and temperature data of the battery cell, the preset data threshold includes a voltage threshold and a temperature threshold, and the step of judging whether the operation data of the battery cell is greater than or equal to the preset data threshold includes: If the voltage data is greater than or equal to the voltage threshold, and the temperature data is greater than or equal to the temperature threshold, it is determined that the operation data of the battery cell is greater than or equal to a preset data threshold.

8. The method for preventing explosion of battery core according to claim 1, characterized in that: The number of the battery cells is at least two, and the method further comprises: If the operating data of any one of the at least two battery cells exceeds the preset data threshold, the explosion-proof valve corresponding to each battery cell is ruptured from the outside of each battery cell to connect the inner and outer spaces of each battery cell through the corresponding discharge port of each battery cell.

9. A battery cell explosion-proof device, characterized in that: It includes an explosion-proof valve and a control module, the battery cell includes a discharge port, and the explosion-proof valve is used to seal the discharge port of the battery cell; The control module is used to obtain the operating data of the battery cell and determine whether the operating data is greater than or equal to a preset data threshold; if so, the explosion-proof valve is opened from the outside of the battery cell to connect the inner and outer spaces of the battery cell through the drain port.

10. The battery core explosion-proof device according to claim 9, characterized in that: It also includes explosion-proof valve protection membrane and trigger device; The control module is further used to apply a trigger pressure to the explosion-proof valve protective film from the outside of the battery cell through a preset trigger control operation; The trigger device is used to break the explosion-proof valve from the outside of the battery cell under the action of the trigger pressure.

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