Power battery, power battery safety management method, system and equipment and vehicle

Abstract

The invention discloses a power battery, a power battery safety management method, a power battery safety management system, power battery safety management equipment and a vehicle, and relates to the technical field of vehicles. The power battery comprises a box body and a battery cell arranged in the box body, and a diaphragm in the battery cell is made of a ceramic silicone rubber material. Therefore, the safety of the power battery can be improved.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and in particular to a power battery, a power battery safety management method, system and equipment, and a vehicle. Background Technology

[0002] With the rapid development of fast charging technology for electric vehicles, supercharging architecture (charging current ≥500A) has become the mainstream development direction in the industry. However, the Joule heating effect caused by high-current charging is significantly aggravated, which poses a serious challenge to the safety of high-energy-density battery cells. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in the related art. Therefore, a first objective of this invention is to provide a power battery that improves the safety of power batteries.

[0004] The second objective of this invention is to propose a method for the safety management of power batteries.

[0005] The third objective of this invention is to provide an electronic device.

[0006] The fourth objective of this invention is to provide a power battery safety management system.

[0007] The fifth objective of this invention is to provide a vehicle.

[0008] To achieve the above objectives, a first aspect of the present invention provides a power battery, including a housing and a battery cell disposed in the housing, wherein the separator inside the battery cell is made of ceramicized silicone rubber material.

[0009] In addition, the power battery according to embodiments of the present invention may also have the following additional technical features: According to one embodiment of the present invention, the positive electrode of the battery cell is made of a modified lithium iron phosphate positive electrode material that has been carbon-coated.

[0010] According to one embodiment of the present invention, a cell explosion-proof valve is provided on the top of the battery cell, a smoke exhaust channel is provided on the top of the housing, an electromagnetic pressure relief valve is provided on the side of the housing, and the power battery further includes a smoke guiding cavity. The smoke guiding cavity is located on the side of the battery cell and can communicate with the smoke exhaust channel. The smoke exhaust channel is arranged opposite to the cell explosion-proof valve, and after the cell explosion-proof valve is opened, the inside of the battery cell can communicate with the smoke exhaust channel. After the electromagnetic pressure relief valve is opened, both the smoke exhaust channel and the smoke guiding cavity can communicate with the external space of the housing through the electromagnetic pressure relief valve.

[0011] According to one embodiment of the present invention, the inner wall of the smoke guiding cavity is covered with an aerogel heat insulation layer.

[0012] To achieve the above objectives, a second aspect of the present invention provides a power battery safety management method. The method is used for the aforementioned power battery and includes: obtaining the cell temperature of the power battery and obtaining the cell temperature change rate based on the cell temperature; when the cell temperature change rate exceeds a preset temperature change rate threshold, cooling the cell of the power battery to achieve safety management of the power battery.

[0013] In addition, the power battery safety management method according to embodiments of the present invention may also have the following additional technical features: According to one embodiment of the present invention, a cell explosion-proof valve is provided on the top of the battery cell in the power battery, a smoke exhaust channel is provided on the top of the housing of the power battery, an electromagnetic pressure relief valve is provided on the side of the housing, the power battery also includes a smoke guiding cavity, the smoke guiding cavity is located on the side of the battery cell, the smoke exhaust channel is connected to the smoke guiding cavity, the smoke exhaust channel is opposite to the cell explosion-proof valve and the inside of the battery cell can be connected to the smoke exhaust channel after the cell explosion-proof valve is opened, and after the electromagnetic pressure relief valve is opened, both the smoke exhaust channel and the smoke guiding cavity can be connected to the external space of the housing through the electromagnetic pressure relief valve. The method further includes: obtaining the air pressure inside the housing, and when the air pressure is greater than a preset air pressure threshold, controlling the electromagnetic pressure relief valve to open.

[0014] According to one embodiment of the present invention, the number of battery cells is multiple, and the multiple battery cells constitute at least one battery cell module. The method further includes: obtaining the gas concentration of a target gas at a preset location in the power battery; when the gas concentration is greater than a preset concentration threshold, identifying a faulty battery cell from the multiple battery cells and disconnecting the electrical connection of the battery cell module where the faulty battery cell is located; wherein the preset location is located in the smoke exhaust channel or the smoke guiding cavity, and the target gas includes at least one of carbon monoxide and hydrogen.

[0015] To achieve the above objectives, a third aspect of the present invention provides an electronic device including a memory, a processor, and a computer program stored in the memory and running on the processor. When the computer program is executed by the processor, it implements the above-described power battery safety management method.

[0016] To achieve the above objectives, a fourth aspect of the present invention provides a power battery safety management system, including the aforementioned electronic equipment.

[0017] To achieve the above objectives, a fifth aspect of the present invention provides a vehicle including the aforementioned power battery and the aforementioned power battery safety management system, wherein the power battery safety management system is used to perform safety management on the power battery.

[0018] According to embodiments of the present invention, a power battery, a power battery safety management method, system, device, and vehicle include a housing and battery cells disposed within the housing. The separator inside the battery cell is made of ceramicized silicone rubber material. By using a separator made of ceramicized silicone rubber material in the battery cell, the internal short-circuit current can be limited to... The following measures will improve the safety of the power battery.

[0019] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a power battery according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the smoke exhaust path according to a specific embodiment of the present invention; Figure 3 This is a cross-sectional view of the internal structure of a power battery according to a specific embodiment of the present invention; Figure 4 This is a flowchart of the power battery safety management method according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the installation position of the temperature sensor according to a specific embodiment of the present invention; Figure 6 This is a schematic diagram showing the installation positions of the pressure sensor and the gas sensor according to a specific embodiment of the present invention; Figure 7 This is a structural block diagram of an electronic device according to an embodiment of the present invention; Figure 8 This is a structural block diagram of the power battery safety management system according to an embodiment of the present invention; Figure 9 This is a structural block diagram of a vehicle according to an embodiment of the present invention. Detailed Implementation

[0021] The following description, with reference to the accompanying drawings, describes embodiments of a power battery, a power battery safety management method, system, device, and vehicle, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described with reference to the accompanying drawings are exemplary and should not be construed as limiting the invention.

[0022] Figure 1 This is a schematic diagram of a power battery according to an embodiment of the present invention.

[0023] like Figure 1 As shown, the power battery 100 includes a housing 101 and a battery cell 102 disposed in the housing 101. The separator inside the battery cell 102 is made of ceramicized silicone rubber material.

[0024] By using a separator made of ceramicized silicone rubber material, a dense carbonized layer can be formed in the separator at 150°C. At this time, for the power battery 100, since the separator in its cell 102 is made of ceramicized silicone rubber material, when the Joule heating effect caused by high current charging causes the temperature inside the cell 102 to reach 150°C, a dense carbonized layer will be formed in the separator inside the cell 102, thereby blocking the internal short circuit current and improving the safety of the power battery 100.

[0025] By using a separator made of ceramicized silicone rubber material, the internal short-circuit current can be blocked, improving the safety of the power battery 100. Actual testing shows that using a separator made of ceramicized silicone rubber material in the cell 102 can limit the internal short-circuit current to within a certain range. In the following, the internal short-circuit current of cell 102 in the related technology will be at least greater than or equal to... It is evident that by replacing the separator in cell 102 with a separator made of ceramicized silicone rubber material, the safety of the power battery 100 can be significantly improved.

[0026] In some embodiments of the present invention, the positive electrode of the battery cell 102 is made of modified lithium iron phosphate positive electrode material that has undergone carbon coating treatment. Actual measurements show that the modified lithium iron phosphate positive electrode material treated with carbon coating process has a thermal decomposition temperature exceeding 250°C, which is more than 40% higher than that of ternary materials.

[0027] In some embodiments of the present invention, a cell explosion-proof valve is provided on the top of the cell 102, a smoke exhaust channel is provided on the top of the housing 101, an electromagnetic pressure relief valve is provided on the side of the housing 101, and the power battery 100 also includes a smoke guiding cavity, which is located on the side of the cell 102 and can communicate with the smoke exhaust channel. The smoke exhaust channel is arranged opposite to the cell explosion-proof valve, and the inside of the cell 102 can communicate with the smoke exhaust channel after the cell explosion-proof valve is opened. After the electromagnetic pressure relief valve is opened, both the smoke exhaust channel and the smoke guiding cavity can communicate with the external space of the housing 101 through the electromagnetic pressure relief valve.

[0028] Specifically, a cell explosion-proof valve is installed on the top of the cell 102, which will open synchronously when the pressure exceeds the limit.

[0029] See Figure 1 It is known that there is more than one battery cell 102 inside the housing 101. Therefore, the provision of a battery cell explosion-proof valve on the top of the battery cell 102 means that a battery cell explosion-proof valve is provided on the top of each battery cell 102.

[0030] In addition, a smoke exhaust channel is provided. This smoke exhaust channel is located on the top of the housing 101 and needs to be set directly opposite the cell explosion-proof valve. When the cell explosion-proof valve of a certain cell 102 is opened, the smoke inside the cell 102 will rush out from the cell explosion-proof valve and enter the smoke exhaust channel.

[0031] A smoke guide cavity is also provided, and this smoke guide cavity can be connected to the smoke exhaust channel. That is to say, when the explosion-proof valve of a certain cell 102 is opened, the smoke inside the cell 102 will rush out from the cell explosion-proof valve and enter the smoke exhaust channel. Then, the smoke entering the smoke exhaust channel will move in the smoke exhaust channel and enter the smoke guide cavity under the guidance of the smoke exhaust channel.

[0032] See Figure 1 ,exist Figure 1 The power battery 100 shown has multiple rows of cells 102. Each row of cells 102 can be set as a cell module. A smoke guide cavity is set between any two adjacent cell modules, and a cell module is also set between the telecommunications module and the side wall of the box.

[0033] An electromagnetic pressure relief valve is also provided, located on the side of the housing 101. When the electromagnetic pressure relief valve is opened, both the exhaust duct and the smoke guiding cavity can be connected to the external space of the housing 101 via the electromagnetic pressure relief valve. In other words, smoke entering the exhaust duct moves within the exhaust duct, not only entering the smoke guiding cavity under the guidance of the exhaust duct, but also reaching the outside of the housing 101 via the electromagnetic pressure relief valve under the guidance of the exhaust duct; similarly, smoke entering the smoke guiding cavity also reaches the outside of the housing 101 via the electromagnetic pressure relief valve under the guidance of the smoke guiding cavity.

[0034] The above settings enable a four-level gradient pressure relief channel, which includes: 1. Cell-level pressure relief, 2. Module-level channel, 3. Energy zone side channel, and 4. System-level emission.

[0035] The aforementioned pressure relief for battery cell 102 refers to the installation of a battery cell explosion-proof valve on the top of battery cell 102, which opens synchronously when the pressure exceeds the limit.

[0036] The aforementioned module-level channel refers to the smoke exhaust channel set at the top of the housing 101, where smoke from the cell explosion-proof valve first enters the smoke exhaust channel.

[0037] The aforementioned energy zone lateral channel refers to the smoke guide cavity set on the side of the battery cell 102. Smoke entering the smoke exhaust channel will be guided into the smoke guide cavity by the smoke exhaust channel.

[0038] The aforementioned system-level emission refers to the electromagnetic pressure relief valve installed on the side of the housing 101. Both the smoke exhaust channel and the smoke guiding cavity can guide smoke into the external space of the housing 101 through the electromagnetic pressure relief valve.

[0039] See Figure 2 The specific embodiment of the smoke exhaust path shown comprises a battery cell explosion-proof valve, a smoke exhaust channel, a smoke guiding cavity, and an electromagnetic pressure relief valve. Since the smoke exhaust channel is located above the battery cell explosion-proof valve, therefore... Figure 2 Not shown in the image, in Figure 2 In the diagram, A is a cell explosion-proof valve, C is a smoke-guiding cavity between the aforementioned cell module and the side wall of the housing, and D is the aforementioned electromagnetic pressure relief valve.

[0040] Therefore, the space on the side of the battery cell 102 can also be utilized for smoke exhaust, thus making full use of the internal space of the power battery 100. Moreover, as mentioned above, the power battery 100 has two smoke exhaust paths: path one is from the cell explosion-proof valve to the smoke exhaust channel, and then from the smoke exhaust channel to the electromagnetic pressure relief valve; path two is from the cell explosion-proof valve to the smoke exhaust channel, then from the smoke exhaust channel to the smoke guiding cavity, and then from the smoke guiding cavity to the electromagnetic pressure relief valve. It is evident that path one is shorter than path two. That is, through the aforementioned four-stage gradient pressure relief channel, the smoke emanating from the battery cell 102 can be guided in two batches to the outside of the housing 101, thereby achieving gradient pressure relief and providing better protection for the power battery 100.

[0041] Moreover, as described above, by simultaneously setting the separator inside the cell 102 to be made of ceramicized silicone rubber material and setting the smoke guide cavity as mentioned above, the safety of the power battery 100 can be improved at both the material of the cell 102 and the structure of the power battery 100, thereby achieving composite safety protection for the power battery 100 and realizing a highly safe power battery 100.

[0042] In some embodiments of the present invention, the inner wall of the smoke guiding cavity is covered with an aerogel insulation layer.

[0043] In some embodiments of the present invention, the thickness of the aerogel insulation layer is 3 mm.

[0044] In some embodiments of the present invention, see Figure 3 The internal cross-sectional view of the power battery shown shows that an L-shaped smoke guide cavity with a cross-section of 33.5mm×36.7mm and a length of 1900mm is arranged between the battery cell module and the side wall of the box. A 13mm vertical smoke exhaust gap is set between the battery cell explosion-proof valve and the top cover of the box 101. This 13mm vertical smoke exhaust gap is the smoke exhaust channel. It adopts a corrugated flow guide structure design to reduce the smoke flow velocity from 15m / s to 8m / s.

[0045] In some embodiments of the present invention, the electromagnetic pressure relief valve is a temperature-sensing explosion-proof valve and is equipped with a three-stage filtration device, which includes a metal wire mesh and a ceramic filter element.

[0046] In some embodiments of the present invention, the total volume of the above-mentioned smoke exhaust channel is 13mm × 1900mm = 24.7L.

[0047] In some embodiments of the present invention, the electromagnetic pressure relief valve adopts magnetohydrodynamic drive technology, and the response time is shortened to the 50ms level.

[0048] In summary, the power battery of this invention includes a housing and battery cells disposed within the housing. The separator inside the battery cell is made of ceramicized silicone rubber material. Actual measurements have shown that by using a separator made of ceramicized silicone rubber material in the battery cell, the internal short-circuit current can be limited to [specific value missing]. The following measures will improve the safety of the power battery.

[0049] Furthermore, this invention proposes a method for the safety management of power batteries.

[0050] Figure 4 This is a flowchart of the power safety management method according to an embodiment of the present invention.

[0051] In this embodiment of the invention, a power battery safety management method is used for the aforementioned power battery.

[0052] like Figure 4 As shown, the power battery safety management method includes: S11: Obtain the cell temperature of the power battery and calculate the cell temperature change rate based on the cell temperature.

[0053] Specifically, in order to manage the power battery safely, a temperature sensor needs to be installed inside the power battery to know the temperature of the cell.

[0054] Once the cell temperature is known, the cell temperature change rate can be obtained from the cell temperature.

[0055] The following description uses a specific example.

[0056] In this specific embodiment, the temperature sensor is an NTC (Negative Temperature Coefficient) sensor. The NTC temperature sensor is installed on the battery cell, and the specific installation location can be found in [reference needed]. Figure 5 The specific embodiments shown are as follows.

[0057] It should be noted that, Figure 5 Only the installation locations of two temperature sensors are shown; in practical applications, the number of temperature sensors can be more than two. Specifically, the aforementioned power sensor includes multiple battery cells, which together constitute at least one battery cell module, and each battery cell module is equipped with two temperature sensors.

[0058] After installing a temperature sensor on the battery cell, the cell temperature can be obtained using the sensor, and then the cell temperature change rate can be calculated using the following formula: , in, ΔT represents the rate of change of cell temperature. It indicates how quickly temperature T changes with time at a specific location x and a specific time t. This is a key output of the algorithm's prediction. A rapidly rising positive value ΔT is the most direct and strongest warning signal that thermal runaway is about to occur or is already happening. It quantifies the rate at which heat accumulates at a certain point. T represents the cell temperature.

[0059] t represents time.

[0060] x is a one-dimensional distance along the thickness direction of the cell or a specific heat conduction path. The specific value of x is the distance between two temperature sensors installed on the cell module to obtain the cell temperature change rate. As an example, assuming there is a cell module 1 in the power battery, the distance between the two temperature sensors installed on the cell module 1 is obtained, and this distance is taken as x. Substituting x into the above formula, the cell temperature change rate of the two cells is obtained by combining the cell temperature collected by the two temperature sensors.

[0061] =0.98, which is the thermal diffusivity of the battery cell. It measures how quickly the temperature inside the material tends to become uniform. The larger the value, the faster the heat can diffuse inside the material and the easier it is to achieve a uniform temperature distribution; the smaller the value, the slower the heat diffuses and the easier it is to form local hot spots.

[0062] The above calculation formula enables the quantitative calculation and prediction of the rate of rapid temperature rise in localized areas within the battery, utilizing the cell's thermal diffusion characteristics and real-time temperature field data. Monitoring the abnormally rapid increase in ΔT is crucial for predicting thermal runaway. Through real-time calculation and judgment, this algorithm can provide earlier and more accurate warnings of thermal runaway risks, thus providing key decision-making basis for initiating multi-level safety response measures (including dynamically optimized smoke extraction). The ultimate goal is to prevent the spread of thermal runaway and ensure the safety of the battery system and personnel.

[0063] S12: When the cell temperature change rate exceeds the preset temperature change rate threshold, the cell of the power battery is cooled to achieve safe management of the power battery.

[0064] Let's continue with the specific example of the battery cell module 1 mentioned above.

[0065] Specifically, as described above, two cell temperature change rates are obtained for cell module 1. These two rates are compared with a preset temperature change rate threshold. If the cell temperature change rate exceeds the threshold, it indicates that the cell is overheating, and cooling is performed. Since the goal is to prevent overheating, cooling is required whenever the cell temperature change rate exceeds the preset threshold, regardless of how many temperature sensors correspond to cells with temperature change rates exceeding the threshold.

[0066] Therefore, safe management of power batteries can be achieved, improving their safety. Furthermore, since this power battery safety management method is applied to the power batteries described in the above embodiments, it can ensure the safety of the power battery from at least two perspectives: cell materials, power battery structure, and power battery safety management. This enables comprehensive safety management of the power battery, further guaranteeing its safety.

[0067] In some embodiments of the present invention, a cell explosion-proof valve is provided on the top of the battery cell in the power battery, a smoke exhaust channel is provided on the top of the battery housing, an electromagnetic pressure relief valve is provided on the side of the housing, and the power battery also includes a smoke guiding cavity, which is located on the side of the battery cell. The smoke exhaust channel is connected to the smoke guiding cavity, and the smoke exhaust channel is opposite to the cell explosion-proof valve. After the cell explosion-proof valve is opened, the inside of the battery cell can be connected to the smoke exhaust channel. After the electromagnetic pressure relief valve is opened, both the smoke exhaust channel and the smoke guiding cavity can be connected to the external space of the housing through the electromagnetic pressure relief valve. The power battery safety management method also includes: obtaining the air pressure inside the housing, and controlling the electromagnetic pressure relief valve to open when the air pressure is greater than a preset air pressure threshold.

[0068] Specifically, by setting up the aforementioned cell explosion-proof valve, smoke exhaust channel, smoke guide cavity, and electromagnetic pressure relief valve, it is possible to ensure that when the electromagnetic pressure relief valve is opened, the smoke rushing out from the cell explosion-proof valve will travel along two paths—the smoke exhaust channel and the smoke guide cavity—to the electromagnetic pressure relief valve, and then leave the enclosure from the electromagnetic pressure relief valve.

[0069] Therefore, a pressure sensor is installed to obtain the air pressure inside the box. When the air pressure inside the box is greater than the preset air pressure threshold, it can be assumed that the cell explosion-proof valve is open. At this time, the electromagnetic pressure relief valve is opened so that the smoke inside the box leaves the box through the electromagnetic pressure relief valve.

[0070] In some embodiments of the present invention, there are multiple battery cells, and multiple battery cells constitute at least one battery cell module. The power battery safety management method further includes: obtaining the gas concentration of a target gas at a preset location in the power battery; when the gas concentration is greater than a preset concentration threshold, identifying the faulty battery cell from the multiple battery cells and disconnecting the electrical connection of the battery cell module where the faulty battery cell is located; wherein the preset location is located in the smoke exhaust channel or smoke guide cavity, and the target gas includes at least one of carbon monoxide and hydrogen.

[0071] To obtain the gas concentration, a gas sensor can be installed inside the power battery, and see [reference needed]. Figure 6 In the specific example shown, the gas sensor can be installed in the same location as the pressure sensor, i.e. Figure 6 The F position in the diagram.

[0072] The following description uses a specific example.

[0073] In this specific embodiment, a temperature sensor, a pressure sensor, and a gas sensor are installed simultaneously inside the power battery, and the temperature sensor is an NTC sensor.

[0074] Specifically, the cell temperature, internal pressure, and target gas concentration are collected by NTC sensors, pressure sensors, and gas sensors, and transmitted to the BMS (Battery Management System) via low-voltage wiring harness. The BMS determines thermal runaway based on the measured temperature, pressure, and gas concentration. If thermal runaway occurs, the BMS sends a request to the vehicle controller to manage the battery's safety.

[0075] The thermal runaway determination made by the BMS based on telecommunications temperature, pressure, and gas concentration can adopt the following three-level response mechanism: In the first stage, when the cell temperature change rate exceeds 3℃ / s, the liquid cooling system is activated.

[0076] In the second stage, when the pressure is greater than 1.2 MPa, the solenoid pressure relief valve is opened.

[0077] The third level involves cutting off the electrical connection of the battery module containing the faulty battery cell when the carbon monoxide concentration at the preset location exceeds 200 ppm.

[0078] The system simultaneously manages the safety of power batteries from three perspectives: cell materials, power battery structure, and power battery safety management.

[0079] The following explanation will be based on a specific experimental result.

[0080] Structural parameters: Cell arrangement: 1P174S, that is, 174 cells connected in series, no parallel connection.

[0081] Maximum continuous charging current: 675A.

[0082] Total volume of the smoke exhaust duct: 24.7L.

[0083] Flow path length: 2.3m from the top of the battery cell to the electromagnetic pressure relief valve.

[0084] Key processes: Laser welding is used to ensure the sealing of the battery cell explosion-proof valve.

[0085] An aerogel layer is coated on the inner wall of the smoke-guiding cavity.

[0086] Sealing structure: The enclosure has an IP67 protection rating, and the leakage rate under vibration conditions is <0.5mL / h.

[0087] Workflow: Step 1: Thermal runaway is triggered.

[0088] When the internal temperature of a certain battery cell is greater than 180°C, a diaphragm made of ceramicized silicone rubber material is used to block ion conduction by closing the pores.

[0089] When a battery cell experiences thermal runaway, the internal pressure reaches 1.5 MPa, triggering the cell's explosion-proof valve and releasing 80% of the initial pressure.

[0090] Step 2: Flue gas diversion.

[0091] The high-temperature flue gas rises vertically through the exhaust channel at a speed of 15 m / s.

[0092] Within the smoke guiding chamber, the flow rate decreases.

[0093] Step 3: Smoke emission.

[0094] The flue gas is filtered through an electromagnetic pressure relief valve before being discharged.

[0095] The exhaust gas temperature is <80℃, which complies with GB / T18384.32022 standard.

[0096] Step 4: System linkage.

[0097] The BMS disconnects the electrical connection of the faulty telecommunications module within 150ms.

[0098] The flow rate of the liquid cooling system has been increased to 20L / min, and the coolant temperature difference is <2℃.

[0099] Experimental results: A thermal runaway test was conducted in accordance with GB 38031-2020 "Safety Requirements for Power Batteries for Electric Vehicles". The test results showed no fire or explosion, as detailed in Table 1 below.

[0100] Table 1

[0101] Test method: The triggering scheme uses a built-in heating film, powered by a 37V DC power supply with a power of approximately 500W. The built-in heating film is embedded in the target cell. After installation, the heating device should be activated within 24 hours to heat the triggered object at its maximum power. Triggering should stop when a thermal event alarm signal is issued, thermal runaway occurs, or the temperature at the monitoring point reaches 300℃.

[0102] Detailed test results: The first stage depressurization is completed within 230ms after thermal runaway is triggered.

[0103] The peak pressure inside the chamber is controlled below 0.8 MPa.

[0104] The surface temperature dropped to 150°C within 5 minutes after thermal runaway was triggered.

[0105] In summary, the power battery safety management method of this invention obtains the cell temperature of the power battery and calculates the cell temperature change rate based on the cell temperature; when the cell temperature change rate exceeds a preset temperature change rate threshold, the power battery cell is cooled to achieve safe management of the power battery.

[0106] Furthermore, the present invention proposes an electronic device.

[0107] Figure 7 This is a structural block diagram of an electronic device according to an embodiment of the present invention.

[0108] like Figure 7 As shown, the electronic device 500 includes a processor 501 and a memory 503. The processor 501 and the memory 503 are connected, for example, via a bus 502. Optionally, the electronic device 500 may also include a transceiver 504. It should be noted that in practical applications, the transceiver 504 is not limited to one type, and the structure of this electronic device 500 does not constitute a limitation on the embodiments of the present invention.

[0109] Processor 501 may be a CPU (Central Processing Unit), a general-purpose processor, a DSP (Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It can implement or execute the various exemplary logic blocks, modules, and circuits described in conjunction with the disclosure of this invention. Processor 501 may also be a combination that implements computational functions, such as including one or more microprocessor combinations, a combination of a DSP and a microprocessor, etc.

[0110] Bus 502 may include a pathway for transmitting information between the aforementioned components. Bus 502 may be a PCI (Peripheral Component Interconnect) bus or an EISA (Extended Industry Standard Architecture) bus, etc. Bus 502 can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 7 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0111] The memory 503 stores a computer program corresponding to the power battery safety management method of the above embodiments of the present invention. This computer program is controlled and executed by the processor 501. The processor 501 executes the computer program stored in the memory 503 to implement the content shown in the aforementioned method embodiments.

[0112] in, Figure 7 The electronic device 500 shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments of the present invention.

[0113] The electronic device of this invention can improve the safety of the power battery by implementing the power battery safety management method of the above embodiments.

[0114] Furthermore, this invention proposes a power battery safety management system.

[0115] Figure 8 This is a structural block diagram of the power battery safety management system according to an embodiment of the present invention.

[0116] like Figure 8As shown, the power battery safety management system 200 includes the aforementioned electronic equipment 500.

[0117] The power battery safety management system 200 of this invention can improve the safety of power batteries through the aforementioned electronic devices.

[0118] Furthermore, the present invention proposes a vehicle.

[0119] Figure 9 This is a structural block diagram of a vehicle according to an embodiment of the present invention.

[0120] like Figure 9 As shown, the vehicle 10 includes the aforementioned power battery 100 and the aforementioned power battery safety management system 200, which is used to perform safety management on the power battery 100.

[0121] The vehicle of this invention, through the power battery and the power battery safety management system of the above embodiments, can improve the safety of the power battery.

[0122] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein can be considered as a ordered list of executable instructions for implementing logical functions, which can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0123] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0124] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0125] In the description of this specification, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and should not be construed as limiting the present invention.

[0126] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0127] In this specification, unless otherwise stated, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly defined. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0128] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0129] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A power battery, characterized in that, It includes a housing and a battery cell disposed in the housing, wherein the diaphragm inside the battery cell is made of ceramicized silicone rubber material.

2. The power battery according to claim 1, characterized in that, The positive electrode of the battery cell is made of modified lithium iron phosphate positive electrode material that has been carbon-coated.

3. The power battery according to claim 1, characterized in that, The top of the battery cell is equipped with a cell explosion-proof valve, the top of the housing is equipped with a smoke exhaust channel, the side of the housing is equipped with an electromagnetic pressure relief valve, and the power battery also includes a smoke guide cavity. The smoke guide cavity is located on the side of the battery cell and can communicate with the smoke exhaust channel. The smoke exhaust channel is opposite to the cell explosion-proof valve, and after the cell explosion-proof valve is opened, the inside of the battery cell can communicate with the smoke exhaust channel. After the electromagnetic pressure relief valve is opened, both the smoke exhaust channel and the smoke guide cavity can communicate with the external space of the housing through the electromagnetic pressure relief valve.

4. The power battery according to claim 3, characterized in that, The inner wall of the smoke-guiding cavity is covered with an aerogel insulation layer.

5. A method for safety management of power batteries, characterized in that, The method is used for a power battery according to any one of claims 1-4, the method comprising: The cell temperature of the power battery is obtained, and the cell temperature change rate is obtained based on the cell temperature. When the temperature change rate of the battery cell exceeds a preset temperature change rate threshold, the battery cell of the power battery is cooled to achieve safe management of the power battery.

6. The power battery safety management method according to claim 5, characterized in that, The power battery has a cell explosion-proof valve on top of the battery cell, a smoke exhaust channel on top of the battery housing, and an electromagnetic pressure relief valve on the side of the housing. The power battery also includes a smoke guiding cavity located to the side of the battery cell. The smoke exhaust channel communicates with the smoke guiding cavity. The smoke exhaust channel is opposite to the cell explosion-proof valve, and after the cell explosion-proof valve is opened, the inside of the battery cell can communicate with the smoke exhaust channel. After the electromagnetic pressure relief valve is opened, both the smoke exhaust channel and the smoke guiding cavity can communicate with the external space of the housing through the electromagnetic pressure relief valve. The method further includes: The air pressure inside the chamber is obtained, and when the air pressure is greater than a preset air pressure threshold, the electromagnetic pressure relief valve is controlled to open.

7. The power battery safety management method according to claim 6, characterized in that, The method further includes: The number of battery cells is multiple, and the multiple battery cells constitute at least one battery cell module; The gas concentration of the target gas at a preset location in the power battery is obtained. When the gas concentration is greater than a preset concentration threshold, the faulty battery cell is identified from the multiple battery cells, and the electrical connection of the battery cell module where the faulty battery cell is located is cut off. The preset location is located in the smoke exhaust channel or the smoke guiding cavity, and the target gas includes at least one of carbon monoxide and hydrogen.

8. An electronic device, characterized in that, It includes a memory, a processor, and a computer program stored in the memory and running on the processor, wherein when the computer program is executed by the processor, it implements the power battery safety management method according to any one of claims 5-7.

9. A power battery safety management system, characterized in that, Including the electronic device according to claim 8.

10. A vehicle, characterized in that, The system includes a power battery according to any one of claims 1-4 and a power battery safety management system according to claim 9, wherein the power battery safety management system is used for safety management of the power battery.

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