Early warning method and system for battery thermal runaway and new energy vehicle

Abstract

The application relates to a warning method and system for battery thermal runaway and a new energy vehicle. The warning method comprises the following steps: obtaining current temperature values of each single battery cell of a power battery of the new energy vehicle; detecting the current working state of each single battery cell according to the obtained current temperature values of the multiple single battery cells; and issuing a warning information of battery thermal runaway when the current working state of any single battery cell is detected as a thermal runaway state. The application can solve the problem in the prior art that temperature signal collection points are usually arranged at certain specific positions of the power battery, only the temperature information at the specific positions is collected, and there is a blind area or a time delay in fault sensing at other positions, which cannot timely issue a danger signal and threatens the personal safety of the driver and passengers.

Description

Technical Field

[0001] This invention relates to the field of new energy power battery technology, and in particular to a method, system and new energy vehicle for early warning of battery thermal runaway. Background Technology

[0002] The increasing demand for the driving range of new energy vehicles has driven the gradual improvement of new energy vehicle technology and power battery technology. This has also led to a continuous increase in the capacity and number of individual cells in power batteries, resulting in an increasing number of voltage and temperature signals that the battery management system needs to collect.

[0003] The greatest danger for power batteries in new energy vehicles is thermal runaway. Once thermal runaway occurs, it can lead to safety accidents such as smoke, fire, or explosion. Moreover, thermal runaway in power batteries is usually caused by a short circuit within a single cell, causing a rapid rise in temperature. Therefore, to ensure the safety and reliability of power batteries, it is necessary to collect and monitor their temperature information. However, in traditional technologies, temperature signal collection points are typically only placed at certain specific locations on the power battery. This means that temperature information is only collected at these specific locations, leaving blind spots or delays in detecting faults at other locations, failing to issue timely danger signals, and threatening the personal safety of passengers. Summary of the Invention

[0004] This invention provides a method, system, and new energy vehicle for early warning of battery thermal runaway. It can solve the problem that in traditional technology, temperature signal acquisition points are usually arranged only at certain specific locations of the power battery, and temperature information is only collected at these specific locations. However, there are blind spots or delays in the detection of faults at other locations, which cannot issue danger signals in time and threaten the personal safety of drivers and passengers.

[0005] To address the aforementioned technical problems, this invention provides a method for early warning of battery thermal runaway, applicable to new energy vehicles, wherein the new energy vehicle includes a power battery with multiple individual cells.

[0006] The early warning method includes:

[0007] Obtain the current temperature value of each individual cell in the power battery of new energy vehicles;

[0008] Based on the current temperature values ​​of the multiple individual cells, the current operating status of each individual cell is detected;

[0009] When it is detected that the current operating state of any single cell is in a thermal runaway state, a warning message for battery thermal runaway is issued.

[0010] Optionally, the new energy vehicle includes:

[0011] Battery management system;

[0012] The flexible circuit board is electrically connected to the battery management system; and,

[0013] The temperature detection structure includes multiple temperature sensors electrically connected to the flexible circuit board, and the multiple temperature sensors are electrically connected to multiple individual cells of the power battery in a one-to-one correspondence.

[0014] The process of obtaining the current temperature value of each individual cell of the power battery of the new energy vehicle includes:

[0015] Multiple temperature sensors are controlled to collect the current temperature values ​​of multiple individual cells of the power battery of the new energy vehicle, and the battery management system is controlled to obtain the collected current temperature values ​​of the multiple individual cells.

[0016] Optionally, detecting the current operating state of each individual cell based on the obtained current temperature values ​​of the multiple individual cells includes:

[0017] Based on the current temperature values ​​of multiple individual cells, the relationship between the current temperature value of any one individual cell and the current temperature values ​​of other individual cells is detected.

[0018] When the real-time temperature difference between the current temperature value of any single cell and the current temperature value of other single cells exceeds the warning temperature difference, the current operating state of any single cell is determined to be thermal runaway.

[0019] When the real-time temperature difference between the current temperature value of any single cell and the current temperature value of other single cells does not exceed the warning temperature difference, the current working state of any single cell is determined to be a normal working state.

[0020] Optionally, detecting the relationship between the current temperature value of any one individual cell and the current temperature values ​​of other individual cells includes:

[0021] Compare the current temperature value of any one of the individual cells with the current temperature value of the other individual cells;

[0022] When the current temperature value of any one of the individual cells is detected to be greater than the current temperature value of other individual cells, the real-time temperature difference between the current temperature value of the one individual cell and the current temperature value of other individual cells is obtained.

[0023] Based on the obtained real-time temperature difference, the relationship between the real-time temperature difference and the warning temperature difference is detected.

[0024] Optionally, determining that the current operating state of any single cell is in a thermal runaway state when the real-time temperature difference between the current temperature value of any single cell and the current temperature value of other single cells exceeds a warning temperature difference value includes:

[0025] When the real-time temperature difference between the current temperature value of any one individual cell and the current temperature value of another individual cell exceeds the warning temperature difference, the relationship between the real-time temperature difference between the current temperature value of any one individual cell and the current temperature values ​​of multiple other individual cells and the warning temperature difference continues to be detected.

[0026] When the real-time temperature difference between the current temperature value of any single cell and the current temperature values ​​of multiple other single cells exceeds the warning temperature difference, the current operating state of any single cell is determined to be thermal runaway.

[0027] Optionally, the step of continuing to detect the relationship between the real-time temperature difference between the current temperature value of any single cell and the current temperature values ​​of multiple other cells and the warning temperature difference includes:

[0028] Select several individual battery cells from a plurality of other individual battery cells whose current distance value from any one of the individual battery cells is greater than a preset distance value, and obtain the current temperature value corresponding to the plurality of individual battery cells;

[0029] Continue to detect the real-time temperature difference between the current temperature value of any single cell and the current temperature value of each of the plurality of single cells, and obtain the relationship between the magnitude of each real-time temperature difference and the warning temperature difference.

[0030] Optionally, the step of continuing to detect the relationship between the real-time temperature difference between the current temperature value of any single cell and the current temperature values ​​of multiple other cells and the warning temperature difference includes:

[0031] Within a preset time period, the current temperature value of any single battery cell is continuously detected multiple times.

[0032] Based on the current temperature value of any single cell detected multiple times, the relationship between the real-time temperature difference of the current temperature value of any single cell detected each time and the current temperature value of other multiple cells and the warning temperature difference is detected.

[0033] Optionally, after repeatedly detecting the current temperature value of any single cell, the method further includes:

[0034] Based on the detected multiple current temperature values ​​of any single battery cell, obtain the temperature change trend of the multiple current temperature values;

[0035] The temperature change trend includes an increasing temperature trend, a decreasing temperature trend, and a constant temperature trend.

[0036] In addition, the present invention also provides an early warning system for battery thermal runaway, which is applied to new energy vehicles, the new energy vehicles including a power battery with multiple individual cells;

[0037] The early warning system includes:

[0038] The temperature acquisition module is used to acquire the current temperature value of each individual cell of the power battery in new energy vehicles.

[0039] The status detection module is used to detect the current operating status of each individual cell based on the current temperature values ​​of the multiple individual cells obtained.

[0040] The early warning module is used to issue a battery thermal runaway warning message when it detects that the current operating state of any single cell is in a thermal runaway state.

[0041] In addition, the present invention also provides a new energy vehicle, comprising:

[0042] A power battery, comprising multiple electrically connected individual cells;

[0043] Battery management system;

[0044] A flexible circuit board is electrically connected to the battery management system.

[0045] The temperature detection structure includes multiple temperature sensors electrically connected to the flexible circuit board, and each of the multiple temperature sensors is electrically connected to one of the multiple individual cells of the power battery; and,

[0046] The controller is electrically connected to the battery management system and the multiple temperature sensors.

[0047] The controller is used to execute the early warning method for battery thermal runaway as described above.

[0048] The beneficial effects of the technical solution provided by this invention include:

[0049] The battery thermal runaway early warning method provided by this invention can acquire the current temperature value of each individual cell of the power battery of a new energy vehicle, thereby collecting the temperature signals of all individual cells of the power battery; moreover, based on the obtained current temperature values ​​of multiple individual cells, it can detect whether the current operating state of each individual cell is in a thermal runaway state or a normal operating state; and when any individual cell is detected to be in a thermal runaway state, an early warning message for battery thermal runaway can be issued.

[0050] In this way, temperature signals can be collected from all individual cells of the power battery of new energy vehicles without creating blind spots or delays in temperature information collection or fault perception. When thermal runaway is detected in any individual cell of the power battery of a new energy vehicle, the information on thermal runaway of that individual cell can be fed back to the whole vehicle in real time, and a danger signal can be issued in a timely manner to warn the driver and passengers to quickly move to a safe area, thus ensuring the personal safety of the driver and passengers. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0052] Figure 1 This is a flowchart illustrating the steps of the early warning method for battery thermal runaway according to an embodiment of the present invention;

[0053] Figure 2 This is a simplified block diagram illustrating the structure of the early warning system for battery thermal runaway as described in an embodiment of the present invention.

[0054] Figure 3 This is a simplified structural diagram of the new energy vehicle described in an embodiment of the present invention;

[0055] Figure 4 This is a simplified three-dimensional structural diagram of the new energy vehicle described in an embodiment of the present invention. Figure 1 ;

[0056] Figure 5 This is a simplified three-dimensional structural diagram of the new energy vehicle described in an embodiment of the present invention. Figure 2 ;

[0057] Figure 6 This is a simplified three-dimensional structural diagram of the new energy vehicle described in an embodiment of the present invention. Figure 3 ;

[0058] Figure 7 This is a simplified three-dimensional structural diagram of the new energy vehicle described in an embodiment of the present invention. Figure 4 . Detailed Implementation

[0059] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0060] It should be noted that the terms "first," "second," etc., in the specification, claims, and drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0061] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0062] To ensure the safety and reliability of power batteries, it is necessary to collect and monitor their temperature information. However, in traditional technologies, temperature signal collection points are typically only placed at certain specific locations on the power battery, and temperature information is only collected at these specific locations. This results in blind spots or delays in detecting faults at other locations, failing to issue timely danger signals and threatening the safety of passengers. To address these technical problems, this invention proposes a method, system, and application for early warning of battery thermal runaway in new energy vehicles.

[0063] Example 1

[0064] This embodiment provides a method for early warning of battery thermal runaway, applicable to new energy vehicles. For example... Figure 3 As shown, the new energy vehicle 1 may include a power battery 10 having multiple individual battery cells 12, and a battery management system 20 electrically connected to the power battery 10.

[0065] Specifically, such as Figure 1 As shown, the early warning method for battery thermal runaway may include the following steps:

[0066] S100: Obtain the current temperature values ​​of multiple individual cells 12 of the power battery 10 of the new energy vehicle;

[0067] S200. Based on the current temperature values ​​of the multiple individual cells 12, detect the current operating status of each individual cell 12.

[0068] S300: When it is detected that the current operating state of any single cell 12 is in a thermal runaway state, a warning message for battery thermal runaway is issued.

[0069] The battery thermal runaway early warning method provided in this embodiment can acquire the current temperature value of each individual cell 12 of the power battery 10 of the new energy vehicle, thereby collecting the temperature signals of all individual cells 12 of the power battery 10; moreover, based on the obtained current temperature values ​​of multiple individual cells 12, it can detect whether the current working state of each individual cell 12 is in a thermal runaway state or a normal working state; and when any individual cell 12 is detected to be in a thermal runaway state, a battery thermal runaway early warning information can be issued.

[0070] In this way, temperature signals can be collected from all individual cells 12 of the power battery 10 of the new energy vehicle without generating temperature information collection, fault perception blind spots or delays. When thermal runaway is detected in any individual cell 12 of the power battery 10 of the new energy vehicle, the information of thermal runaway of the individual cell 12 can be fed back to the whole vehicle in real time, and a danger signal can be issued in a timely manner to warn the driver and passengers to quickly move to a safe area, thus ensuring the personal safety of the driver and passengers.

[0071] Moreover, in this embodiment, such as Figure 4 and Figure 6 As shown, the new energy vehicle 1 may include a power battery 10 having multiple individual battery cells 12, a battery management system 20 electrically connected to the power battery 10, a flexible circuit board 30 electrically connected to the battery management system 20, and a temperature detection structure 40 electrically connected to the flexible circuit board 30 and the multiple individual battery cells 12. The temperature detection structure 40 can detect the temperature signal of each individual battery cell 12 of the power battery 10 and transmit the detected temperature signal to the battery management system 20 through the flexible circuit board 30, thereby achieving temperature monitoring of each individual battery cell 12 of the power battery 10. Further, the temperature detection structure 40 may include multiple temperature sensors 42 electrically connected to the flexible circuit board 30, with each temperature sensor 42 electrically connected to one of the multiple individual battery cells 12 of the power battery 10.

[0072] Therefore, in step S100 above, obtaining the current temperature values ​​of multiple individual cells 12 of the power battery 10 of the new energy vehicle can further include the following steps:

[0073] S110 controls multiple temperature sensors 42 to collect the current temperature values ​​of multiple individual cells 12 of the power battery 10 of the new energy vehicle, and controls the battery management system 20 to obtain the collected current temperature values ​​of multiple individual cells 12.

[0074] Moreover, such as Figures 4 to 7As shown, the temperature detection structure 40 may include multiple temperature sensors 42 electrically connected to the flexible circuit board 30, and multiple metal connecting plates 44 electrically connected to the flexible circuit board 30. The multiple temperature sensors 42 and the multiple metal connecting plates 44 are in thermal contact with each other, and the multiple metal connecting plates 44 are used to electrically connect with multiple individual cells 12 of the power battery 10. When a single cell 12 experiences thermal runaway, the internal heat of the single cell 12 can be conducted to a metal connecting plate 44 connected to it. The metal connecting plate 44 will conduct the heat to a temperature sensor 42 that is thermally connected to it. The temperature sensor 42 detects the temperature rise and can convert the temperature signal into an electrical signal and quickly feed it back to the battery management system 20 through the lines in the flexible circuit board 30.

[0075] Specifically, in one case, such as Figure 4 and Figure 5 As shown, the temperature sensor 42 can be directly attached to the metal connecting plate 44. This allows the temperature sensor 42 to detect the temperature of the metal connecting plate 44 through direct contact, resulting in high detection accuracy. Alternatively, the temperature sensor 42 can be soldered onto the flexible circuit board 30 to achieve electrical connection. The temperature sensor 42 can be integrated into the flexible circuit board 30, and the number of temperature signal acquisition points can be arranged according to the number of individual battery cells 12. Furthermore, the temperature sensor 42 can be connected to the battery management system 20 in parallel.

[0076] Furthermore, in this configuration, the temperature sensor 42 may include a sensor body soldered to the flexible circuit board 30, and a sensor temperature-sensing part protruding from the sensor body, with the sensor temperature-sensing part attached to one end of the metal connecting plate 44. The temperature sensor 42 can be configured as an L-shaped irregular structure. The metal connecting plate 44 can conduct the temperature of the individual battery cells 12 connected to it, while the temperature of the metal connecting plate is sensed by the protruding sensor temperature-sensing part of the temperature sensor. The temperature sensed by the sensor temperature-sensing part is collected by the sensor body, and the collected temperature signal is transmitted to the battery management system 20 via the flexible circuit board 30. Moreover, the sensor temperature-sensing part can be attached to the top surface of the metal connecting plate 44 or to the side surface of the metal connecting plate 44.

[0077] Furthermore, a first thermally conductive structure can be provided between the temperature sensing part of the temperature sensor 42 and the metal connecting plate 44. By providing a first thermally conductive structure at the contact point between the temperature sensor 42 and the metal connecting plate 44, thermal conductivity can be enhanced, preventing poor thermal conductivity and making the temperature acquisition by the temperature sensor 42 more accurate and reliable. Moreover, in this embodiment, the first thermally conductive structure can be a thermal paste structure, which can enhance the thermal conductivity between the temperature sensing part of the sensor and the metal connecting plate 44.

[0078] In addition, in another case, such as Figure 6 and Figure 7 As shown, the flexible circuit board 30 can be provided with multiple thermally conductive metal foils 43, with multiple temperature sensors 42 in thermal contact with each of the multiple thermally conductive metal foils 43, and multiple metal connecting plates 44 in thermal contact with each of the multiple thermally conductive metal foils 43. In this case, the temperature sensors 42 and the metal connecting plates 44 can be indirectly thermally connected through the thermally conductive metal foils 43. That is, the heat from the individual battery cell 12 can be transferred to the thermally conductive metal foils 43 through the metal connecting plates 44, and then the heat can be transferred to the temperature sensors 42 through the thermally conductive metal foils 43. Moreover, the thermally conductive metal foils 43 can be made of copper foil, which has good electrical and thermal conductivity and is easy to install on the flexible circuit board 30. In this case, the temperature sensors 42 can adopt a conventional shape and structure.

[0079] In this alternative configuration, the temperature sensor 42 may include a sensor body soldered to the flexible circuit board 30, and a temperature-sensing part located at the bottom of the sensor body, which may contact or be connected to the thermally conductive metal foil 43. The metal connecting plate 44 can conduct the temperature of the individual battery cell 12 to the thermally conductive metal foil 43. The temperature of the thermally conductive metal foil is sensed by the temperature-sensing part at the bottom of the temperature sensor 42, and the temperature sensed by the temperature-sensing part is collected by the sensor body. The collected temperature signal is then transmitted to the battery management system 20 via the flexible circuit board 30.

[0080] Furthermore, the temperature sensor 42 can be soldered onto the flexible circuit board 30 and electrically connected to the flexible circuit board 30. The temperature sensing part of the sensor can be located at the bottom center of the temperature sensor 42, in contact with the thermally conductive metal foil 43 (such as copper foil, or other metal foil) on the flexible circuit board 30. The thermally conductive metal foil 43 at this location can be an extension electrically connected to the metal connecting plate 44, playing a role in heat transfer, that is, the heat of the metal connecting plate 44 can be transferred to the temperature sensor 42 through the thermally conductive metal foil 43.

[0081] Furthermore, a second thermally conductive structure can be provided between the temperature sensing part at the bottom of the temperature sensor 42 and the thermally conductive metal foil 43. Similarly, by providing a second thermally conductive structure at the contact point between the temperature sensor 42 and the thermally conductive metal foil 43, thermal conductivity can be enhanced, preventing poor thermal conductivity and making the temperature acquisition by the temperature sensor 42 more accurate and reliable. Moreover, the second thermally conductive structure can also be a thermal paste structure, which can enhance the thermal conductivity between the temperature sensing part of the sensor and the thermally conductive metal foil 43. In addition, the temperature sensor 42 and the thermally conductive metal foil 43 can also be directly welded together to allow direct heat transfer between the two.

[0082] Furthermore, a mounting groove can be provided through the end of the metal connecting plate 44, and the temperature sensor 42 can be correspondingly disposed in the mounting groove. By placing the temperature sensor 42 in the mounting groove at the end of the metal connecting plate 44, the metal connecting plate 44 and the temperature sensor 42 can be arranged more compactly, reducing their space occupation and improving the integration of the flexible circuit board 30. Moreover, the temperature sensor 42 is spaced apart from the groove wall, and the two are directly thermally connected only through the thermally conductive metal foil 43.

[0083] Furthermore, each metal connecting plate 44 can be used for electrode welding connection with a single cell 12 of the power battery 10. Moreover, the metal connecting plate 44 can be made of nickel sheet or nickel plate. By making the metal connecting plate 44 a nickel sheet, it has high thermal and electrical conductivity, which can effectively conduct the heat and temperature information of the single cell to the temperature sensor.

[0084] Furthermore, in step S200 above, detecting the current operating state of each individual cell 12 based on the obtained current temperature values ​​of the multiple individual cells 12 may further include the following steps:

[0085] S210. Based on the current temperature values ​​of the multiple individual cells 12, detect the relationship between the current temperature value of any one individual cell 12 and the current temperature values ​​of the other individual cells 12.

[0086] After detecting the corresponding current temperature value through the temperature sensor 42 corresponding to each individual cell 12, the current temperature values ​​of all individual cells 12 of the power battery 10 can be obtained. Then, the current temperature values ​​of all individual cells 12 can be compared and analyzed (for example, the current temperature values ​​of all individual cells 12 can be sorted from high to low), and the individual cell 12 with the largest current temperature value can be obtained from all individual cells 12.

[0087] S220. When the real-time temperature difference between the current temperature value of any single cell 12 and the current temperature value of other single cells 12 exceeds the warning temperature difference, it is determined that the current working state of any single cell 12 is thermal runaway.

[0088] After obtaining the current temperature value of a single battery cell 12 with the highest current temperature, the current temperature value of this single battery cell 12 can be subtracted from the current temperature values ​​of other single battery cells 12 to obtain multiple corresponding real-time temperature difference values. Moreover, the largest real-time temperature difference value can be selected from the multiple real-time temperature difference values ​​and compared with a preset warning temperature difference value. Based on whether the real-time temperature difference value exceeds the warning temperature difference value, it can be determined whether the single battery cell 12 with the highest current temperature value is in a state of thermal runaway.

[0089] S230. When the real-time temperature difference between the current temperature value of any single cell 12 and the current temperature value of other single cells 12 does not exceed the warning temperature difference, the current working state of any single cell 12 is determined to be a normal working state.

[0090] Furthermore, in step S210 above, detecting the relationship between the current temperature value of any one individual cell 12 and the current temperature values ​​of other individual cells 12 may further include the following steps:

[0091] S212. Compare the current temperature value of any one of the individual cells 12 with the current temperature values ​​of the other individual cells 12.

[0092] After obtaining the current temperature values ​​of all individual cells 12 of the power battery 10, the current temperature values ​​of all individual cells 12 can be compared and sorted. The current temperature values ​​of all individual cells 12 can be sorted in descending or ascending order to obtain the relationship between the current temperature value of any individual cell 12 and the current temperature values ​​of other individual cells 12.

[0093] S214. When the current temperature value of any single cell 12 is detected to be greater than the current temperature value of other single cells 12, the real-time temperature difference between the current temperature value of any single cell 12 and the current temperature value of other single cells 12 is obtained.

[0094] After obtaining the relationship between the current temperature value of any single cell 12 and the current temperature values ​​of other single cells 12, the difference between the two can be obtained through subtraction, i.e., the real-time temperature difference.

[0095] S216. Based on the obtained real-time temperature difference, detect the relationship between the real-time temperature difference and the warning temperature difference.

[0096] Similarly, after obtaining the real-time temperature difference between the current temperature value of any single battery cell 12 and the current temperature values ​​of other single battery cells 12, these real-time temperature differences can be sorted in descending or ascending order to obtain the largest real-time temperature difference and the corresponding single battery cell 12. The largest real-time temperature difference is then compared with the warning temperature difference to determine whether the largest real-time temperature difference exceeds the warning temperature difference. Specifically, the warning temperature difference can be set to 10℃, 8℃, 12℃, etc.

[0097] Furthermore, in step S220 above, when the real-time temperature difference between the current temperature value of any single cell 12 and the current temperature value of other single cells 12 exceeds the warning temperature difference, determining that the current operating state of any single cell 12 is a thermal runaway state may further include the following steps:

[0098] S222. When the real-time temperature difference between the current temperature value of any single cell 12 and the current temperature value of another single cell 12 exceeds the warning temperature difference, continue to detect the relationship between the real-time temperature difference between the current temperature value of any single cell 12 and the current temperature values ​​of multiple single cells 12 and the warning temperature difference.

[0099] S224. When the real-time temperature difference between the current temperature value of any single cell 12 and the current temperature values ​​of multiple other single cells 12 exceeds the warning temperature difference, the current working state of any single cell 12 is determined to be thermal runaway.

[0100] When the real-time temperature difference between the current temperature of one individual battery cell 12 and the current temperature of another individual battery cell 12 exceeds a warning temperature difference threshold, this individual battery cell 12 may not necessarily have experienced thermal runaway. It's possible that the current temperature of the other individual battery cell 12 being compared is inaccurate. Therefore, it's necessary to continue comparing this potentially thermally runaway individual battery cell 12 with other individual battery cells. When the actual temperature difference between this individual battery cell 12 and the current temperature of multiple other individual battery cells all exceed the warning temperature threshold, it can be further confirmed that thermal runaway may have occurred in this individual battery cell 12.

[0101] Furthermore, in step S222 above, the relationship between the real-time temperature difference between the current temperature value of any single cell 12 and the real-time temperature difference between the current temperature values ​​of multiple other single cells 12 and the warning temperature difference can be further included in the following steps:

[0102] S2221. Select several individual cells 12 from the other individual cells 12 whose current distance value from any individual cell 12 is greater than a preset distance value, and obtain the current temperature value corresponding to the several individual cells 12.

[0103] S2222 Continue to detect the real-time temperature difference between the current temperature value of any single cell 12 and the current temperature value of each single cell 12 in the plurality of single cells 12, and obtain the relationship between the magnitude of each real-time temperature difference and the warning temperature difference.

[0104] Since the suspected thermal runaway cell 12 may affect the temperature of other nearby cells 12, it is necessary to select other cells that are far away from the suspected thermal runaway cell 12 for comparative analysis to further ensure that the obtained real-time temperature difference is more accurate and reliable.

[0105] Furthermore, in step S222 above, the process of continuing to detect the relationship between the real-time temperature difference between the current temperature value of any single cell 12 and the current temperature values ​​of multiple other cells 12 and the warning temperature difference can also include the following steps:

[0106] S2223. Within a preset time period, continue to detect the current temperature value of any single cell 12 multiple times.

[0107] Since the current temperature value of any single cell 12 obtained from a single test may contain errors or inaccuracies, multiple tests can be performed to reduce or eliminate these errors or inaccuracies. Therefore, the current temperature values ​​of all the single cells 12 of the power battery 10 can be obtained multiple times by performing multiple temperature tests on them within a preset time period (such as 1s, 1.5s, or 2s, etc.).

[0108] S2224. Based on the current temperature value of any single cell 12 detected multiple times, detect the relationship between the real-time temperature difference between the current temperature value of any single cell 12 detected each time and the current temperature values ​​of other single cells 12 and the warning temperature difference.

[0109] Similarly, the current temperature value of the single cell 12 obtained multiple times can be processed using the above step S210.

[0110] Furthermore, in step S222 above, after repeatedly detecting the current temperature value of any single cell 12, the following steps may be further included:

[0111] S2225. Based on the multiple current temperature values ​​detected for any single cell 12, obtain the temperature change trend of the multiple current temperature values; wherein, the temperature change trend includes a temperature increase trend, a temperature decrease trend, and a constant temperature trend.

[0112] Furthermore, by repeatedly detecting the current temperature value of any single cell 12 within a preset time period, the temperature change trend of that single cell 12 can be further obtained. For example, if the real-time temperature difference between one single cell 12 and another single cell 12 exceeds the warning temperature difference, indicating a possibility of thermal runaway, further detection of the current temperature value of that single cell 12 showing an increasing temperature trend can further confirm that the single cell 12 is in a state of thermal runaway. Conversely, if the real-time temperature difference between one single cell 12 and another single cell 12 exceeds the warning temperature difference, indicating a possibility of thermal runaway, further detection of the current temperature value of that single cell 12 showing a decreasing temperature trend or a constant temperature trend can confirm that the single cell 12 is in a normal operating state.

[0113] Furthermore, in step S300 above, when it is detected that the current operating state of any single cell 12 is in a thermal runaway state, a warning message of battery thermal runaway can be sent to the whole vehicle. The warning message can be issued in the form of warning lights and / or warning sounds to warn the driver and passengers to quickly move to a safe area, thereby ensuring the personal safety of the driver and passengers.

[0114] Example 2

[0115] like Figure 2 As shown, this embodiment provides a warning system 100 for battery thermal runaway, applicable to new energy vehicles. Figure 3 As shown, the new energy vehicle 1 includes a power battery 10 with multiple individual battery cells 12, and a battery management system 20 electrically connected to the power battery 10. Furthermore, the new energy vehicle 1 may also include a flexible circuit board 30 electrically connected to the battery management system 20, and a temperature detection structure 40 electrically connected to the flexible circuit board 30 and the multiple individual battery cells 12. The temperature detection structure 40 can detect the temperature signal of each individual battery cell 12 of the power battery 10, and transmit the detected temperature signal to the battery management system 20 through the flexible circuit board 30, thereby achieving temperature monitoring of each individual battery cell 12 of the power battery 10.

[0116] Furthermore, the temperature detection structure 40 may include multiple temperature sensors 42 electrically connected to the flexible circuit board 30, with each temperature sensor 42 electrically connected to a corresponding individual cell 12 of the power battery 10. Moreover, the temperature detection structure 40 may also include multiple metal connecting plates 44 electrically connected to the flexible circuit board 30, with each temperature sensor 42 in thermal contact with a corresponding metal connecting plate 44. The metal connecting plates 44 are used for electrical connection to each individual cell 12 of the power battery 10. When a cell 12 experiences thermal runaway, the internal heat of that cell 12 can be conducted to a metal connecting plate 44 connected to it. This metal connecting plate 44 then conducts the heat to a corresponding thermally connected temperature sensor 42. The temperature sensor 42 detects the temperature rise (temperature signal) and converts the temperature signal into an electrical signal, which is then rapidly fed back to the battery management system 20 via the circuitry in the flexible circuit board 30.

[0117] Specifically, such as Figure 2 As shown, the battery thermal runaway early warning system 100 may include:

[0118] Temperature acquisition module 102 is used to acquire the current temperature values ​​of multiple individual cells of the power battery of new energy vehicles.

[0119] The status detection module 104 is used to detect the current working status of each individual cell based on the current temperature values ​​of the multiple individual cells obtained.

[0120] The early warning module 106 is used to issue a battery thermal runaway warning message when it detects that the current operating state of any single cell is thermal runaway.

[0121] The early warning system 100 for battery thermal runaway described in this embodiment corresponds to the early warning method for battery thermal runaway described above. The functions of each module in the early warning system 100 for battery thermal runaway described in this embodiment are explained in detail in the corresponding method embodiments, and will not be repeated here.

[0122] Example 3

[0123] like Figure 3 As shown, this embodiment provides a new energy vehicle 1, including a power battery 10 having multiple individual cells 12, a battery management system 20 electrically connected to the power battery 10, a flexible circuit board 30 electrically connected to the battery management system 20, a temperature detection structure 40 connected to the flexible circuit board 30 and the individual cells 12, and a controller 50 electrically connected to both the battery management system 30 and the temperature detection structure 40.

[0124] Under the control of the controller 50, the temperature signal of each individual cell 12 of the power battery 10 can be detected through the temperature detection structure 40, and the detected temperature signal is transmitted to the battery management system 20 through the flexible circuit board 30 to realize temperature monitoring of each individual cell 12 of the power battery 10. When thermal runaway is detected in any individual cell 12 of the power battery 10 of the new energy vehicle, the information of thermal runaway of the individual cell 12 can be fed back to the whole vehicle in real time, and the danger of thermal runaway can be detected in time to warn the driver and passengers to quickly move to a safe area, thus ensuring the personal safety of the driver and passengers.

[0125] Moreover, such as Figures 4 to 7As shown, the temperature detection structure 40 may include multiple temperature sensors 42 electrically connected to the flexible circuit board 30, and the multiple temperature sensors 42 are electrically connected to multiple individual cells 12 of the power battery 10 in a one-to-one correspondence. Specifically, the temperature detection structure 40 may include multiple temperature sensors 42 electrically connected to the flexible circuit board 30, and multiple metal connecting plates 44 electrically connected to the flexible circuit board 30. The multiple temperature sensors 42 and the multiple metal connecting plates 44 are in thermal contact with each other in a one-to-one correspondence, and the multiple metal connecting plates 44 are used to electrically connect to the multiple individual cells 12 of the power battery 10 in a one-to-one correspondence. When a single cell 12 experiences thermal runaway, the internal heat of the single cell 12 can be conducted to a metal connecting plate 44 connected to it. The metal connecting plate 44 will conduct the heat to a temperature sensor 42 thermally connected to it. The temperature sensor 42 detects the temperature rise and can convert the temperature signal into an electrical signal and quickly feed it back to the battery management system 20 through the circuit in the flexible circuit board 30.

[0126] Furthermore, in this embodiment, the controller 50 can be located in the battery management system 20, or it can be located in the ECU (Electronic Control Unit) of a new energy vehicle. In the new energy vehicle, the controller 50 may have the following functions:

[0127] Obtain the current temperature values ​​of multiple individual cells 12 of the power battery 10 of the new energy vehicle;

[0128] Based on the current temperature values ​​of multiple individual cells 12, the current operating status of each individual cell 12 is detected;

[0129] When any single cell 12 is detected to be in a thermal runaway state, a warning message for battery thermal runaway is issued.

[0130] Similarly, in this embodiment, the controller can be used to implement each step of the above-mentioned early warning method for battery thermal runaway. The specific implementation method can be referred to the specific content of the above-mentioned early warning method for battery thermal runaway, which will not be repeated here.

[0131] This embodiment proposes a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement all or part of the method steps of the early warning method for battery thermal runaway as described above.

[0132] The present invention can implement all or part of the processes in the above methods, or it can be accomplished by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable file, or some intermediate form. The computer-readable medium can include: any entity or device capable of carrying computer program code, recording media, USB flash drive, portable hard drive, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium can be appropriately added or removed according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, the computer-readable medium does not include electrical carrier signals and telecommunication signals.

[0133] Based on the same inventive concept, embodiments of the present invention also provide an electronic device, including a memory and a processor, wherein the memory stores a computer program that runs on the processor, and the processor executes the computer program to implement all or part of the method steps described above.

[0134] The processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor. The processor is the control center of the computer device, connecting all parts of the computer device through various interfaces and lines.

[0135] Memory can be used to store computer programs and / or models. The processor performs various functions of the computer device by running or executing the computer programs and / or models stored in the memory, and by accessing data stored in the memory. Memory can primarily include a program storage area and a data storage area. The program storage area can store the operating system and at least one application program required for a function (e.g., sound playback, image playback, etc.); the data storage area can store data created based on the use of the mobile phone (e.g., audio data, video data, etc.). Furthermore, memory can include high-speed random access memory, and can also include non-volatile memory, such as hard disks, RAM, plug-in hard disks, smart media cards (SMC), secure digital cards (SD cards), flash cards, at least one disk storage device, flash memory device, or other volatile solid-state storage devices.

[0136] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, servers, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0137] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), servers, and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0138] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0139] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0140] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for early warning of battery thermal runaway, applied to a new energy vehicle; the new energy vehicle includes a power battery having multiple individual cells, a battery management system, a flexible circuit board electrically connected to the battery management system, and a temperature detection structure connected to the flexible circuit board and the power battery; The temperature detection structure includes multiple temperature sensors electrically connected to the flexible circuit board and multiple metal connecting plates thermally contacting the flexible circuit board. The multiple temperature sensors and the multiple metal connecting plates are thermally contacted in a one-to-one correspondence. The multiple metal connecting plates are used to thermally contact the multiple individual cells of the power battery in a one-to-one correspondence. The temperature sensor includes a sensor body welded to the flexible circuit board, and a sensor temperature sensing part protruding from the sensor body. The sensor temperature sensing part is attached to one end of the metal connecting plate. The multiple temperature sensors are in thermal contact with the multiple individual cells of the power battery. Its features are, The early warning method includes: The current temperature value of each individual cell of the power battery of the new energy vehicle is obtained; that is, multiple temperature sensors are controlled to collect the current temperature value of each individual cell of the power battery of the new energy vehicle, and the battery management system is controlled to obtain the collected current temperature value of the multiple individual cells. Based on the obtained current temperature values ​​of multiple individual battery cells, the current operating state of each individual battery cell is detected, specifically including: comparing the current temperature value of any one individual battery cell with the current temperature values ​​of other individual battery cells; when it is detected that the current temperature value of any one individual battery cell is greater than the current temperature values ​​of other individual battery cells, obtaining a real-time temperature difference between the current temperature value of any one individual battery cell and the current temperature values ​​of other individual battery cells; when it is detected that the real-time temperature difference between the current temperature value of any one individual battery cell and the current temperature value of other individual battery cells exceeds a warning temperature difference value, selecting several individual battery cells from the other multiple individual battery cells whose current distance value from the first individual battery cell is greater than a preset distance value, and obtaining the several... The system continuously monitors the current temperature value corresponding to each individual battery cell, and then monitors the real-time temperature difference between the current temperature value of any individual battery cell and the current temperature value of each of the plurality of individual battery cells. Within a preset time period, the system repeatedly monitors the current temperature value of any individual battery cell, and obtains the temperature change trend of that individual battery cell based on the multiple monitoring results. The temperature change trend includes an increasing temperature trend, a decreasing temperature trend, and a constant temperature trend. When the current temperature value of any individual battery cell is detected to exceed a warning temperature difference value, and the temperature change trend of that individual battery cell is an increasing temperature trend, the current operating state of that individual battery cell is determined to be a thermal runaway state; otherwise, it is determined to be a normal operating state. When it is detected that the current operating state of any single cell is in a thermal runaway state, a warning message for battery thermal runaway is issued.

2. The early warning method for battery thermal runaway according to claim 1, characterized in that, A first thermally conductive structure, which is a thermally conductive paste structure, is provided between the temperature sensing part of the sensor and the metal connecting plate.

3. The early warning method for battery thermal runaway according to claim 1, characterized in that, The flexible circuit board is provided with multiple thermally conductive metal foils, and multiple temperature sensors are in thermal contact with the multiple thermally conductive metal foils in a one-to-one correspondence. Multiple metal connecting plates are in thermal contact with the multiple thermally conductive metal foils in a one-to-one correspondence. The temperature sensing part of the sensor is in thermal contact with the thermally conductive metal foil.

4. The early warning method for battery thermal runaway according to claim 3, characterized in that, A second thermally conductive structure, which is a thermally conductive paste structure, is provided between the temperature sensing part of the sensor and the thermally conductive metal foil.

5. The early warning method for battery thermal runaway according to claim 1, characterized in that, The end of the metal connecting plate is provided with a mounting groove, and the temperature sensor is correspondingly installed in the mounting groove. The temperature sensor is spaced apart from the groove wall.

6. The early warning method for battery thermal runaway according to claim 1, characterized in that, The metal connecting plate is a nickel sheet, and the metal connecting plate is welded to the electrode of the single battery cell.

7. The early warning method for battery thermal runaway according to claim 1, characterized in that, The warning temperature difference is 8℃-12℃, and the preset time period is 1s-2s.

8. The early warning method for battery thermal runaway according to claim 1, characterized in that, The issuance of warning information for battery thermal runaway includes issuing warning information by means of warning lights and / or warning sounds.

9. A warning system for battery thermal runaway, applied to a new energy vehicle; the new energy vehicle includes a power battery with multiple individual cells, a battery management system, a flexible circuit board electrically connected to the battery management system, and a temperature detection structure connected to the flexible circuit board and the power battery; The temperature detection structure includes multiple temperature sensors electrically connected to the flexible circuit board and multiple metal connecting plates in thermal contact with the flexible circuit board. Each temperature sensor is in thermal contact with one of the multiple metal connecting plates, and each of the multiple metal connecting plates is in thermal contact with one of the multiple individual cells of the power battery. Each temperature sensor includes a sensor body welded to the flexible circuit board and a sensor temperature-sensing part protruding from the sensor body. The sensor temperature-sensing part is attached to one end of each metal connecting plate. Each temperature sensor is in thermal contact with one of the multiple individual cells of the power battery. Its features are, The early warning system includes: The temperature acquisition module is used to acquire the current temperature value of each individual cell of the power battery of the new energy vehicle; that is, to control multiple temperature sensors to collect the current temperature value of each individual cell of the power battery of the new energy vehicle, and to control the battery management system to acquire the collected current temperature value of the individual cells. The status detection module is used to detect the current operating status of each individual cell based on the current temperature values ​​of the multiple individual cells obtained. The early warning module is used to issue a battery thermal runaway warning message when it detects that the current operating state of any single cell is in a thermal runaway state. Specifically, when the state detection module performs the detection of the current operating state of each individual cell, it is used to: compare the current temperature value of any one individual cell with the current temperature values ​​of other individual cells; when it is detected that the current temperature value of any one individual cell is greater than the current temperature values ​​of other individual cells, obtain the real-time temperature difference between the current temperature value of any one individual cell and the current temperature values ​​of other individual cells; when it is detected that the real-time temperature difference between the current temperature value of any one individual cell and the current temperature value of other individual cells exceeds a warning temperature difference value, select several individual cells from the other individual cells whose current distance value from the first individual cell is greater than a preset distance value, and obtain the several individual cells... The system continuously monitors the current temperature value corresponding to the cell, and then monitors the real-time temperature difference between the current temperature value of any single cell and the current temperature value of each of the plurality of single cells. Within a preset time period, the system continues to monitor the current temperature value of any single cell multiple times, and obtains the temperature change trend of the single cell based on the multiple monitoring results. The temperature change trend includes a temperature increase trend, a temperature decrease trend, and a constant temperature trend. When it is detected that the current temperature value of any single cell and the real-time temperature difference of the plurality of single cells all exceed the warning temperature difference value, and the temperature change trend of the single cell is a temperature increase trend, the current working state of the single cell is determined to be a thermal runaway state; otherwise, it is determined to be a normal working state.

10. A new energy vehicle, characterized in that, include: A power battery, comprising multiple electrically connected individual cells; Battery management system; A flexible circuit board is electrically connected to the battery management system. The temperature detection structure includes multiple temperature sensors electrically connected to the flexible circuit board and multiple metal connecting plates in thermal contact with the flexible circuit board. Each temperature sensor is in thermal contact with one of the multiple metal connecting plates, and each of the multiple metal connecting plates is in thermal contact with one of the multiple individual cells of the power battery. Each temperature sensor includes a sensor body welded to the flexible circuit board and a sensor temperature-sensing part protruding from the sensor body. The sensor temperature-sensing part is attached to one end of each metal connecting plate. Each temperature sensor is in thermal contact with one of the multiple individual cells of the power battery. as well as, The controller is electrically connected to the battery management system and the multiple temperature sensors. The controller is used to execute the early warning method for battery thermal runaway as described in any one of claims 1 to 8.

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