Device for detecting safe distance of battery explosion-proof valve, vehicle and detection method
Patent Information
- Application Number
- CN202411621699.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-13
- Publication Date
- 2025-02-18
Smart Images
Figure CN119468890A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of power batteries, and in particular to a device, a vehicle and a detection method for detecting the safe distance of a battery explosion-proof valve. Background Art
[0002] With the continuous development of science and technology and the diversification of user needs, the field of new energy vehicles has also developed rapidly. Among them, power batteries, as the main core components of new energy vehicles, are of great importance to new energy vehicles.
[0003] However, in actual vehicle use, especially in high-temperature environments, power batteries are more likely to accumulate heat, causing the overall temperature to rise. If the heat is not dissipated in time and accumulates rapidly inside the battery, once it exceeds the critical value, the battery may leak, smoke, and other phenomena, and in severe cases, it may cause thermal runaway. When the battery cell in the battery is in thermal runaway, the pressure inside the battery cell will rise sharply, causing the explosion-proof valve on the battery cell to open. During this process, the battery cell will eject high-temperature and high-pressure solid ejecta through the explosion-proof valve. These ejecta are not only high in temperature, but may also contain conductive substances, posing a threat to the insulation environment of the battery. Under normal circumstances, the inside of the battery is highly insulated to ensure that the current flows only in the predetermined path. However, when the explosion-proof valve on the battery cell is opened, the ejected high-temperature and high-pressure solid ejecta may destroy this insulation environment, causing parts that should not be in contact to come into contact. In particular, when the ejecta contacts the box cover of the battery system, if the box cover is conductive (or becomes conductive for some reason), and there is a high-voltage circuit at this time, a short circuit may occur, causing a fire or explosion. Summary of the invention
[0004] The present application provides a device, a vehicle and a detection method for detecting the safe distance of a battery explosion-proof valve. By simulating the thermal runaway scenario of a battery cell unit, the minimum safe distance between the explosion-proof valve and the conductive panel is directly measured. The result is intuitive and reliable, and is suitable for safety performance tests of battery cells of different types and specifications. It avoids the high cost and long time consumption of traditional high-energy-density battery pack thermal runaway tests, and significantly improves experimental efficiency and cost-effectiveness.
[0005] In order to achieve the above objectives, this application provides the following technical solutions:
[0006] In a first aspect, the present application provides a device for detecting a safe distance of a battery explosion-proof valve, comprising:
[0007] A plurality of battery cells, each of which is provided with an explosion-proof valve;
[0008] A conductive panel, one end of which is electrically connected to one of the battery cells, and the conductive panel is not in contact with other battery cells;
[0009] A high voltage power supply, the high voltage power supply is electrically connected to the battery cell unit;
[0010] An ammeter, one end of the ammeter is connected to the battery cell unit, and the other end of the ammeter is connected to the conductive panel;
[0011] The high-voltage power supply is used to input high voltage into the battery cell unit, and the explosion-proof valve is opened by triggering the battery cell unit. After the explosion-proof valve is opened, the ejecta are sprayed toward the conductive panel. Whether the circuit formed by the conductive panel and the battery cell unit is conductive is judged by observing whether the ammeter displays a reading.
[0012] Based on the above technical solution, the present application can also be improved as follows.
[0013] In a possible implementation, the conductive panel has a first surface and a second surface, and the first surface is arranged toward the battery cell unit;
[0014] The conductive panel and the battery cell unit have a certain distance in the height direction.
[0015] In a possible implementation manner, the conductive panel is a metal panel.
[0016] In a possible implementation, the device for detecting the safe distance of the battery explosion-proof valve further includes: four support columns;
[0017] The four support columns are respectively connected to the first surface of the conductive panel and supported at the four corners of the conductive panel, and the support columns are not in contact with the battery cell units.
[0018] In a possible implementation, the device for detecting the safe distance of the battery explosion-proof valve further includes: a heating element;
[0019] The heating element is located at one side of the battery cell unit and is connected to the battery cell unit;
[0020] The heating element is used to heat the battery cell unit so that the internal temperature of the battery cell unit reaches a temperature at which the explosion-proof valve opens.
[0021] In a possible implementation, each battery cell unit includes: a pole piece assembly;
[0022] The pole piece assembly is located on the side of the battery cell unit facing the conductive panel.
[0023] In a possible implementation, the pole piece assembly includes: a first pole piece and a second pole piece;
[0024] The first pole piece and the second pole piece are respectively located at two ends of the battery cell unit, and the explosion-proof valve is located between the first pole piece and the second pole piece.
[0025] In a possible implementation, one end of the conductive panel is electrically connected to one of the first pole piece and the second pole piece of one of the battery cell units.
[0026] A second aspect of the present application provides a battery system, comprising at least one of the above-mentioned devices for detecting the safe distance of a battery explosion-proof valve.
[0027] The third aspect of the present application provides a method for detecting a safe distance of a battery explosion-proof valve, comprising:
[0028] Start the high-voltage power supply and gradually increase the voltage of the high-voltage power supply to a preset voltage value to satisfy the high-voltage environment of the battery cell unit, and open the explosion-proof valve by triggering the battery cell unit;
[0029] Monitor whether the ammeter has a reading to determine whether the circuit between the battery cell unit and the conductive panel is conductive due to the conduction of the ejected material ejected by the battery cell unit after the explosion-proof valve is opened;
[0030] If there is a reading on the ammeter, the circuit is in a conducting state, and the distance between the conductive panel and the explosion-proof valve is L1;
[0031] Adjust the distance between the conductive panel and the explosion-proof valve so that the distance between the conductive panel and the explosion-proof valve is L2, and L2>L1;
[0032] If there is no reading on the ammeter, the circuit is in a non-conductive state, and the distance L2 between the conductive panel and the explosion-proof valve is the minimum safe distance;
[0033] Repeat the above process to verify different distances between the conductive panel and the explosion proof valve.
[0034] The present application provides a device, a vehicle and a detection method for detecting the safe distance of a battery explosion-proof valve. The device for detecting the safe distance of a battery explosion-proof valve includes a plurality of battery cells, a conductive panel, a high-voltage power supply and an ammeter. Each battery cell is provided with an explosion-proof valve. One end of the conductive panel is electrically connected to one of the battery cells, and the conductive panel does not contact the other battery cells. The high-voltage power supply is electrically connected to the battery cell, one end of the ammeter is connected to the battery cell, and the other end of the ammeter is connected to the conductive panel. The high-voltage power supply is used to input high voltage to the battery cell, and the explosion-proof valve is opened by triggering the battery cell. After the explosion-proof valve is opened, the ejecta is ejected toward the conductive panel, and the reading is observed to determine whether the circuit formed by the conductive panel and the battery cell is conductive. The battery system includes at least one of the above-mentioned devices for detecting the safe distance of a battery explosion-proof valve. The method for detecting the safe distance of a battery explosion-proof valve comprises: starting a high-voltage power supply, and gradually increasing the voltage of the high-voltage power supply to a preset voltage value, so as to satisfy that a battery cell unit is in a high-voltage environment, and triggering the battery cell unit to open the explosion-proof valve; monitoring whether an ammeter has a reading, so as to determine whether a circuit between the battery cell unit and a conductive panel is connected due to the conduction of an ejection material ejected by the battery cell unit after the explosion-proof valve is opened; if the ammeter has a reading, the circuit is in a conductive state, and at this time, the distance between the conductive panel and the explosion-proof valve is L1; adjusting the distance between the conductive panel and the explosion-proof valve, so that the distance between the conductive panel and the explosion-proof valve is L2, and L2>L1; if the ammeter has no reading, the circuit is in a non-conductive state, and at this time, the distance L2 between the conductive panel and the explosion-proof valve is a minimum safe distance; repeating the above process to verify different distances between the conductive panel and the explosion-proof valve. In this way, the present application can directly measure the minimum safe distance between the explosion-proof valve and the conductive panel by simulating the thermal runaway scenario of the battery unit. The results are intuitive and reliable, and are suitable for safety performance tests of battery cells of different types and specifications. It avoids the high cost and long time of traditional high-energy-density battery pack thermal runaway testing, and significantly improves experimental efficiency and cost-effectiveness. BRIEF DESCRIPTION OF THE DRAWINGS
[0035] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0036] Figure 1 A schematic diagram of the structure of a device for detecting the safe distance of a battery explosion-proof valve provided in one embodiment of the present application;
[0037] Figure 2A schematic diagram of the structure of a device for detecting a safe distance of a battery explosion-proof valve provided in another embodiment of the present application;
[0038] Figure 3 A schematic diagram of a method for detecting a safe distance of a battery explosion-proof valve provided in one embodiment of the present application.
[0039] Description of reference numerals:
[0040] 100- A device for detecting the safe distance of the battery explosion-proof valve;
[0041] 200-cell unit;
[0042] 210-explosion-proof valve;
[0043] 300-conductive panel;
[0044] 310-first surface; 320-second surface; 330-support column; 340-connecting harness;
[0045] 400- high voltage power supply;
[0046] 500-galvanometer;
[0047] 600-pole piece assembly;
[0048] 610-first pole piece; 620-second pole piece;
[0049] 700-non-contact conductor;
[0050] 710-Gap. DETAILED DESCRIPTION
[0051] As described in the background art, when a battery cell in a battery cell experiences thermal runaway, the pressure inside the battery cell will rise sharply, causing the explosion-proof valve on the battery cell to open. During this process, the battery cell will eject high-temperature and high-pressure solid eruptions through the explosion-proof valve. These eruptions are not only high in temperature, but may also contain conductive substances, posing a threat to the insulation environment of the battery. Under normal circumstances, the inside of the battery is highly insulated to ensure that the current flows only in a predetermined path. However, when the explosion-proof valve on the battery cell is opened, the ejected high-temperature and high-pressure solid eruptions may destroy this insulation environment, causing parts that should not be in contact to come into contact. In particular, when the eruption contacts the box cover of the battery system, if the box cover is conductive (or becomes conductive for some reason), and there is a high-voltage circuit at this time, a short circuit may occur, causing a fire or explosion.
[0052] In view of the above technical problems, the embodiments of the present application provide a device, a vehicle and a detection method for detecting the safe distance of a battery explosion-proof valve. The device for detecting the safe distance of a battery explosion-proof valve includes a plurality of battery cells, a conductive panel, a high-voltage power supply and an ammeter. Among them, an explosion-proof valve is provided on each battery cell. One end of the conductive panel is electrically connected to one of the battery cells, and the conductive panel is not in contact with other battery cells. The high-voltage power supply is electrically connected to the battery cell, one end of the ammeter is connected to the battery cell, and the other end of the ammeter is connected to the conductive panel. The high-voltage power supply is used to input high voltage to the battery cell, and the explosion-proof valve is opened by triggering the battery cell. After the explosion-proof valve is opened, the ejecta is ejected toward the conductive panel, and the reading is observed to determine whether the circuit formed by the conductive panel and the battery cell is conductive. The battery system includes at least one of the above-mentioned devices for detecting the safe distance of a battery explosion-proof valve. The method for detecting the safe distance of a battery explosion-proof valve comprises: starting a high-voltage power supply, and gradually increasing the voltage of the high-voltage power supply to a preset voltage value, so as to satisfy that a battery cell unit is in a high-voltage environment, and triggering the battery cell unit to open the explosion-proof valve; monitoring whether an ammeter has a reading, so as to determine whether a circuit between the battery cell unit and a conductive panel is connected due to the conduction of an ejection material ejected by the battery cell unit after the explosion-proof valve is opened; if the ammeter has a reading, the circuit is in a conductive state, and at this time, the distance between the conductive panel and the explosion-proof valve is L1; adjusting the distance between the conductive panel and the explosion-proof valve, so that the distance between the conductive panel and the explosion-proof valve is L2, and L2>L1; if the ammeter has no reading, the circuit is in a non-conductive state, and at this time, the distance L2 between the conductive panel and the explosion-proof valve is a minimum safe distance; repeating the above process to verify different distances between the conductive panel and the explosion-proof valve. In this way, the present application can directly measure the minimum safe distance between the explosion-proof valve and the conductive panel by simulating the thermal runaway scenario of the battery unit. The results are intuitive and reliable, and are suitable for safety performance tests of battery cells of different types and specifications. It avoids the high cost and long time of traditional high-energy-density battery pack thermal runaway testing, and significantly improves experimental efficiency and cost-effectiveness.
[0053] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of this application.
[0054] The embodiments of the present application provide a device, a vehicle, and a detection method for detecting the safe distance of a battery explosion-proof valve. By simulating the thermal runaway scenario of a battery cell unit, the minimum safe distance between the explosion-proof valve and the conductive panel is directly measured. The result is intuitive and reliable, and is applicable to safety performance tests of batteries of different types and specifications, avoiding the high cost and long time consumption of traditional high-energy-density battery pack thermal runaway tests, and significantly improving experimental efficiency and cost-effectiveness. The following is an introduction to the specific structure of the device for detecting the safe distance of a battery explosion-proof valve and the vehicle provided in the embodiments of the present application in conjunction with the accompanying drawings.
[0055] refer to Figure 1 In the first aspect of the embodiment of the present application, a device 100 for detecting the safe distance of a battery explosion-proof valve is provided. The device 100 for detecting the safe distance of a battery explosion-proof valve may include a battery cell 200, a conductive panel 300, a high-voltage power supply 400, and an ammeter 500. In a possible implementation, the battery cell 200 may be a cylindrical battery cell, or the battery cell 200 may also be a square shell battery cell, and the number of battery cell units 200 may be several. The present application does not limit the shape and number of the battery cell units 200. In the embodiment of the present application, each battery cell 200 may be provided with an explosion-proof valve 210, and the explosion-proof valve 210 may be provided on the side of the battery cell 200 facing the conductive panel 300, and the explosion-proof valve 210 may be located in the middle of the battery cell 200. It is understandable that one end of the conductive panel 300 may be electrically connected to one of the battery cells 200, and the conductive panel 300 does not contact the other battery cells 200. In a possible implementation, one end of the conductive panel 300 may be electrically connected to the outermost battery cell unit 200 via a connecting harness 340 .
[0056] Continue to refer Figure 1 In the specific implementation of this embodiment, the high-voltage power supply 400 can be electrically connected to the battery cell unit 200. One end of the ammeter 500 can be connected to the battery cell unit 200, and the other end of the ammeter 500 can be connected to the conductive panel 300. It can be understood that the ammeter 500 can be used to detect whether the circuit formed by the conductive panel 300 and the battery cell unit 200 is conductive. Among them, the high-voltage power supply 400 can be used to input high voltage into the battery cell unit 200, and then trigger the battery cell unit 200 so that the explosion-proof valve 210 is in an open state. After the explosion-proof valve 210 is opened, the battery cell unit 200 will eject a fixed ejecta of high temperature and high pressure, and the ejection direction can be as follows: Figure 2As shown by the arrow in the middle. Since the eruption may contain conductive materials, the eruption after the explosion-proof valve 210 is opened is ejected toward the conductive panel 300. By observing whether the reading is displayed on the ammeter 500, it is determined whether the circuit formed by the conductive panel 300 and the battery cell unit 200 is conductive due to the conduction of the eruption. It can be understood that the high-voltage power supply 400 can provide a high-voltage environment for the battery cell unit 200, so that the battery cell unit 200 is in a thermal runaway state, and then determine the minimum safety distance inside the battery to prevent the occurrence of short circuit.
[0057] Continue to refer Figure 1 , based on the above embodiment, in one possible implementation, the shape of the conductive panel 300 can be a rectangular structure, or the orthographic projection of the conductive panel 300 toward the battery cell unit 200 can be a rectangular structure, and the present application does not limit the shape of the conductive panel 300. In the embodiment of the present application, the conductive panel 300 can be located at one end of the battery cell unit 200, and the conductive panel 300 can be fixedly connected to the battery cell unit 200 through the connecting harness 340. In one possible implementation, the conductive panel 300 can have a first surface 310 and a second surface 320. Among them, the first surface 310 of the conductive panel 300 can be arranged toward the battery cell unit 200, and the second surface 320 can be arranged away from the battery cell unit 200. It can be understood that the conductive panel 300 and the battery cell unit 200 have a certain distance in the height direction, wherein the conductive panel 300 can be equivalent to the box cover in the battery system, so as to facilitate the determination of the minimum safe distance between the explosion-proof valve 210 of the battery cell unit 200 and the box cover.
[0058] Continue to refer Figure 1 Based on the above embodiment, in one possible implementation, the conductive panel 300 may be a metal panel. It is understood that the metal panel has good conductivity and can be used as the conductive panel 300 to effectively conduct current for connection and distribution in the circuit.
[0059] Continue to refer Figure 1, based on the above embodiment, the device 100 for detecting the safe distance of the battery explosion-proof valve may further include: a support column 330. In a possible implementation, the number of the support columns 330 may be at least four, and the present application does not limit the number of the support columns 330. In the embodiment of the present application, an example is given with the number of the support columns 330 being four, wherein the four support columns 330 may be respectively connected to the first surface 310 of the conductive panel 300, and the four support columns 330 may be supported at the four corners of the conductive panel 300. In a possible implementation, the size of the support column 330 may be greater than or equal to the height size of the battery cell unit 200, so that there is a certain distance between the conductive panel 300 and the battery cell unit 200. In addition, the support column 330 and the battery cell unit 200 are not in contact, further reducing the situation where the circuit is turned on and a short circuit occurs.
[0060] refer to Figure 2 On the basis of the above-mentioned embodiment, the device 100 for detecting the safe distance of the battery explosion-proof valve may further include: a heating element (not shown in the figure). The heating element may be located on one side of the battery cell unit 200, and the heating element may be connected to the battery cell unit 200. It is understandable that the heating element can be used to heat the battery cell unit 200, so that the internal temperature of the battery cell unit 200 can reach the temperature at which the explosion-proof valve 210 is opened, thereby making the explosion-proof valve 210 in an open state. In a possible implementation, the heating element may be a heating plate, a heating film, or other heating element, which is not limited in the embodiment of the present application.
[0061] On the basis of the above-mentioned embodiment, in addition to the above-mentioned method of triggering the battery cell unit 200 by temperature, in another possible implementation method, the battery cell unit 200 can also be triggered by overcharging. When the battery cell unit 200 is overcharged, a large amount of gas will be generated inside the battery cell unit 200, resulting in increased pressure. When the pressure reaches the opening pressure of the explosion-proof valve 210, the explosion-proof valve 210 will be in an open state to release the internal pressure. In addition, in some other embodiments, the battery cell unit 200 can also be triggered by over-discharging. It is understandable that long-term over-discharging may cause damage to the internal structure of the battery cell unit 200, thereby causing an internal short circuit in the battery cell unit 200, generating high temperature and gas, and thus causing the explosion-proof valve 210 to open.
[0062] Continue to refer Figure 1 On the basis of the above embodiment, each battery cell unit 200 may include: a pole piece assembly 600. The pole piece assembly 600 may be located on a side of the battery cell unit 200 facing the conductive panel 300. In a possible implementation, the pole piece assembly 600 may be electrically connected to the battery cell unit 200. In the embodiment of the present application, the pole piece assembly 600 and the battery cell unit 200 may be fixedly connected by welding or the like.
[0063] refer to Figure 1 as well as Figure 2 On the basis of the above embodiment, the pole piece assembly 600 may include a first pole piece 610 and a second pole piece 620. The first pole piece 610 and the second pole piece 620 may be located at both ends of the battery cell unit 200, respectively. In a possible implementation, the first pole piece 610 and the second pole piece 620 may be located on a side of the battery cell unit 200 facing the conductive panel 300, and the explosion-proof valve 210 may be located between the first pole piece 610 and the second pole piece 620.
[0064] Continue to refer Figure 1 as well as Figure 2 On the basis of the above embodiment, one end of the conductive panel 300 can be electrically connected to one of the first pole piece 610 and the second pole piece 620 of one of the battery cell units 200. In one possible implementation, one end of the conductive panel 300 can be electrically connected to the first pole piece 610 in the outermost battery cell unit 200 through a connecting harness 340. Alternatively, in another possible implementation, one end of the conductive panel 300 can be electrically connected to the second pole piece 620 in the outermost battery cell unit 200 through a connecting harness 340. Of course, in some other embodiments, one end of the conductive panel 300 can also be connected to any battery cell unit 200 among several battery cell units 200, which is not limited in the embodiment of the present application. It can be understood that in the device 100 for detecting the safe distance of the battery explosion-proof valve provided in the present application, except for the battery cell unit 200 connected to one end of the conductive panel 300, when any other battery cell unit 200 has thermal runaway, the explosion-proof valve 210 can respond immediately and make the battery cell unit 200 eject solid particles with conductive properties.
[0065] It should be noted that, under high-voltage environment, the battery cell unit 200 can eject solid particles with conductive properties after the explosion-proof valve 210 is opened. Under the action of the high-voltage electric field, these particles can easily form a conductive bridge between the battery cell unit 200 and the conductive panel 300, thereby causing a short circuit phenomenon, which may be accompanied by a strong short-circuit arcing phenomenon. Among them, short-circuit arcing is a dangerous electrical phenomenon that generates a large amount of heat and light, and may even cause a fire or explosion. However, the occurrence of short-circuit arcing is not inevitable. It is mainly affected by two factors: one is the level of high voltage, and the other is the distance between the explosion-proof valve 210 and the box cover. The greater the high voltage, the greater the possibility of a short circuit; the closer the distance, the greater the chance that the ejected material contacts the box cover and causes a short circuit.
[0066] In another possible implementation, reference Figure 2As shown, the device 100 for detecting the safe distance of the explosion-proof valve of the battery can also include a non-contact conductor 700, thereby replacing the conductive panel 300 to simulate the battery box cover. The non-contact conductor 700 is two unconnected conductors, and there is a preset gap 710 between the conductors. The position of the gap 710 can be set relative to the valve opening of the explosion-proof valve 210 of the battery cell unit 200. In this way, the injection direction can be as follows Figure 2 As shown by the middle arrow, the ejection of the battery cell unit 200 after the explosion-proof valve 210 is opened is ejected toward the gap 710, and the ammeter 500 detects whether the circuit is conductive, and can detect whether the ejection ejected by the explosion-proof valve 210 is conductive, thereby testing the actual distance between the explosion-proof valve 210 and the conductor gap. In some embodiments, the non-contact conductor 700 can be a conductive conductor such as a metal sheet or a probe, and the embodiment of the present application is not limited here.
[0067] On the basis of the above embodiment, the device 100 for detecting the safe distance of a battery explosion-proof valve may further include a data acquisition system (not shown in the figure). The data acquisition system can be used to automatically record data such as voltage and current during the experiment, thereby improving the efficiency and accuracy of the experiment.
[0068] The second aspect of the embodiment of the present application provides a battery system (not shown in the figure), which may include at least one of the above-mentioned devices 100 for detecting the safe distance of the battery explosion-proof valve. In some embodiments of the present application, the battery system may include a plurality of stacked battery cells 200, or the battery system may also include a battery pack directly formed by a group of stacked battery cells 200. It is understood that the battery system can be applied to energy storage, battery replacement, power and other fields.
[0069] Based on the above-mentioned device 100 for detecting the safe distance of a battery explosion-proof valve and the structure of the battery system, the third aspect of the embodiment of the present application provides a method for detecting the safe distance of a battery explosion-proof valve. Figure 3 The detection method may include starting the high-voltage power supply 400 and gradually increasing the voltage of the high-voltage power supply 400 to a preset voltage value to satisfy the high-voltage environment of the battery cell 200, and triggering the battery cell 200 to open the explosion-proof valve 210, monitoring whether the ammeter 500 has a reading to determine whether the circuit between the battery cell 200 and the conductive panel 300 is conductive due to the conduction of the ejection material ejected by the battery cell 200 after the explosion-proof valve 210 is opened, recording the distance between the conductive panel 300 and the explosion-proof valve 210, and obtaining the minimum safe distance under this condition through experiments.
[0070] Figure 3 A schematic diagram of a method for detecting a safe distance of a battery explosion-proof valve provided in an embodiment of the present application, with reference to Figure 3As shown, a method for detecting a safe distance of a battery explosion-proof valve provided in an embodiment of the present application includes:
[0071] S301, start the high-voltage power supply 400, and gradually increase the voltage of the high-voltage power supply 400 to a preset voltage value to meet the high-voltage environment of the battery cell unit 200, and open the explosion-proof valve 210 by triggering the battery cell unit 200.
[0072] In the embodiment of the present application, the high-voltage power supply 400 is started and the voltage of the high-voltage power supply 400 is gradually increased to reach a preset voltage value, so that the high-voltage power supply 400 provides a high-voltage environment for the battery cell 200. The battery cell 200 is triggered by heating the battery cell 200 with a heating element, so that the explosion-proof valve 210 of the battery cell 200 is in an open state.
[0073] S302 , monitoring whether the ammeter 500 has a reading, so as to determine whether the circuit between the battery cell unit 200 and the conductive panel 300 is conductive due to the conduction of the ejected material ejected from the battery cell unit 200 after the explosion-proof valve 210 is opened.
[0074] In the embodiment of the present application, when the explosion-proof valve 210 of the battery cell unit 200 is in an open state under a high-pressure environment, it is monitored in real time whether there is a reading on the ammeter 500, and whether the current value is displayed on the ammeter 500, so as to determine whether the circuit between the battery cell unit 200 and the conductive panel 300 is conductive due to the conductivity of the ejected material ejected from the battery cell unit 200 after the explosion-proof valve 210 is opened.
[0075] S303, if there is a reading on the ammeter 500, the circuit is in a conducting state, and at this time the distance between the conductive panel 300 and the explosion-proof valve 210 is L1.
[0076] In the embodiment of the present application, if there is a reading on the ammeter 500, the ejection material sprayed by the battery cell unit 200 toward the conductive panel 300 through the explosion-proof valve 210 contains a conductive substance, which can make the current value displayed on the ammeter 500. At this time, the circuit is in a conductive state, and the distance between the conductive panel 300 and the explosion-proof valve 210 can be L1.
[0077] S304 , adjusting the distance between the conductive panel 300 and the explosion-proof valve 210 so that the distance between the conductive panel 300 and the explosion-proof valve 210 is L2 , and L2 > L1 .
[0078] In an embodiment of the present application, after the distance between the conductive panel 300 and the explosion-proof valve 210 is L1 and the circuit is turned on, the distance between the conductive panel 300 and the explosion-proof valve 210 is adjusted so that the distance between the conductive panel 300 and the explosion-proof valve 210 is L2, and the condition L2>L1 is satisfied, and it is observed whether the ammeter 500 has a reading when the distance between the conductive panel 300 and the explosion-proof valve 210 is L2.
[0079] S305 , if there is no reading on the ammeter 500 , the circuit is in a non-conducting state, and at this time, the distance L2 between the conductive panel 300 and the explosion-proof valve 210 is the minimum safety distance.
[0080] In the embodiment of the present application, if there is no reading on the ammeter 500, the circuit is in a non-conducting state. At this time, the distance between the conductive panel 300 and the explosion-proof valve 210 can be L2. It can be understood that L2 is the minimum safe distance between the explosion-proof valve 210 and the conductive panel 300.
[0081] S306 , repeat the above process to verify different distances between the conductive panel 300 and the explosion-proof valve 210 .
[0082] In the embodiment of the present application, it is understood that the distance between the conductive panel 300 and the explosion-proof valve 210 is adjusted according to the experimental results, and the experiment is repeated to verify the reliability of the results. The minimum safe distance between the conductive panel 300 and the explosion-proof valve 210 can be measured under different high-voltage conditions through multiple experiments to obtain more comprehensive data support.
[0083] In the embodiment of the present application, by simulating the thermal runaway scenario of the battery cell unit 200, the minimum safe distance between the explosion-proof valve 210 and the conductive panel 300 is directly measured. The result is intuitive and reliable, and is applicable to the safety performance test of batteries of different types and specifications, avoiding the high cost and long time consumption of traditional high-energy density battery pack thermal runaway test, and significantly improving the experimental efficiency and cost-effectiveness. In addition, the detection method has strong repeatability and controllable experimental conditions, which facilitates repeated experiments to verify the accuracy of the results.
[0084] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.
[0085] It should be noted that the phrases "in specific implementation", "in some embodiments", "in this embodiment", "exemplarily" and the like mentioned in the specification indicate that the described embodiment may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing specific features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments that are explicitly or not explicitly described.
[0086] In general, terms should be understood, at least in part, by the context in which they are used. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, depending, at least in part, on the context. Similarly, terms such as "a," "an," or "the" may also be understood to convey singular usage or to convey plural usage, depending, at least in part, on the context.
[0087] It should be easily understood that “on,” “above,” and “over” in the present disclosure should be interpreted in the broadest manner, so that “on” not only means “directly on something,” but also includes the meaning of “on something” with intervening features or layers therebetween, and “above” or “over” not only includes the meaning of “above” or “over,” but also may include the meaning of “above” or “over something” with no intervening features or layers therebetween (i.e., directly on something).
[0088] In addition, spatially relative terms, such as "below," "below," "beneath," "above," "above," etc., may be used herein for ease of description to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation shown in the figures. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatially relative descriptors used herein may likewise be interpreted accordingly.
[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A device for detecting the safe distance of a battery explosion-proof valve, characterized in that: include: A plurality of battery cell units, each of which is provided with an explosion-proof valve; A conductive panel, one end of which is electrically connected to one of the battery cells, and the conductive panel is not in contact with the other battery cells; A high voltage power supply, the high voltage power supply is electrically connected to the battery cell unit; an ammeter, one end of which is connected to the battery cell unit, and the other end of which is connected to the conductive panel; The high-voltage power supply is used to input high voltage to the battery cell unit, and the explosion-proof valve is opened by triggering the battery cell unit. After the explosion-proof valve is opened, the ejecta are sprayed toward the conductive panel. Whether the circuit formed by the conductive panel and the battery cell unit is conductive is determined by observing whether the ammeter displays a reading.
2. The device for detecting the safe distance of a battery explosion-proof valve according to claim 1, characterized in that: The conductive panel has a first surface and a second surface, and the first surface is arranged toward the battery cell unit; The conductive panel and the battery cell unit have a certain distance in the height direction.
3. The device for detecting the safe distance of a battery explosion-proof valve according to claim 2, characterized in that: The conductive panel is a metal panel.
4. The device for detecting the safe distance of a battery explosion-proof valve according to claim 2, characterized in that: The device for detecting the safe distance of the battery explosion-proof valve also includes: four support columns; The four support columns are respectively connected to the first surface of the conductive panel and supported at four corners of the conductive panel, and the support columns are not in contact with the battery cell units.
5. The device for detecting the safe distance of a battery explosion-proof valve according to any one of claims 1 to 4, characterized in that: The device for detecting the safe distance of the battery explosion-proof valve further includes: a heating element; The heating element is located at one side of the battery cell unit and is connected to the battery cell unit; The heating element is used to heat the battery cell unit so that the internal temperature of the battery cell unit reaches the temperature at which the explosion-proof valve opens.
6. The device for detecting the safe distance of a battery explosion-proof valve according to any one of claims 1 to 4, characterized in that: Each of the battery cell units comprises: a pole piece assembly; The pole piece assembly is located on a side of the battery cell unit facing the conductive panel.
7. The device for detecting the safe distance of a battery explosion-proof valve according to claim 6, characterized in that: The pole piece assembly comprises: a first pole piece and a second pole piece; The first pole piece and the second pole piece are respectively located at two ends of the battery cell unit, and the explosion-proof valve is located between the first pole piece and the second pole piece.
8. The device for detecting the safe distance of a battery explosion-proof valve according to claim 7, characterized in that: One end of the conductive panel is electrically connected to one of the first pole piece and the second pole piece of one of the battery cell units.
9. A battery system, characterized in that: The device comprises at least one device for detecting the safe distance of a battery explosion-proof valve according to any one of claims 1 to 8.
10. A method for detecting the safe distance of a battery explosion-proof valve, characterized in that: include: Start the high-voltage power supply and gradually increase the voltage of the high-voltage power supply to a preset voltage value to satisfy the high-voltage environment of the battery cell unit, and open the explosion-proof valve by triggering the battery cell unit; Monitor whether the ammeter has a reading to determine whether the circuit between the battery cell unit and the conductive panel is conductive due to the conduction of the ejected material ejected by the battery cell unit after the explosion-proof valve is opened; If there is a reading on the ammeter, the circuit is in a conducting state, and the distance between the conductive panel and the explosion-proof valve is L1; Adjust the distance between the conductive panel and the explosion-proof valve so that the distance between the conductive panel and the explosion-proof valve is L2, and L2>L1; If there is no reading on the ammeter, the circuit is in a non-conductive state, and the distance L2 between the conductive panel and the explosion-proof valve is the minimum safe distance; Repeat the above process to verify different distances between the conductive panel and the explosion proof valve.