Battery management system, electric vehicle and power battery protection method

Abstract

A battery management system, an electric vehicle and a power battery protection method.The battery management system (10) comprises a detection board and a control board (13), the detection board is connected with a vehicle-mounted power battery (20) and used for detecting the thermal runaway state of a battery cell of the power battery (20), the control board (13) is connected with the detection board, the control board (13) comprises a power supply chip (131) and a controller (132), the detection board is arranged independent of the control board (13), the detection board is connected with the power supply chip (131), and the power supply chip (131) is connected with the controller (132); the power battery protection method comprises the following steps: detecting a battery cell thermal runaway state of a vehicle-mounted power battery (20); when the battery management system (10) is offline and thermal runaway of a battery cell of the power battery (20) is detected, a wake-up signal is generated; and the battery management system (10) is awakened to work through the awakening signal and a thermal runaway alarm is given out, so that a good safety protection function can be provided for the power battery (20).

Description

Battery management system, electric vehicle, and power battery protection method Technical Field

[0001] The embodiments of the present application relate to the technical field of electric vehicles, and in particular to a battery management system, an electric vehicle, and a power battery protection method. Background Art

[0002] With the continuous depletion of oil and gas energy and growing awareness of environmental protection, electric vehicles are being actively promoted and used as a new, environmentally friendly means of transportation, replacing traditional energy vehicles. Power batteries are a key source of power for electric vehicles, and their safety is a primary concern and issue that must be addressed during their development. Typically, the power batteries in electric vehicles require multiple cells to be connected in series and parallel for group operation. Because grouped batteries have higher energy, thermal runaway can easily occur under extreme operating conditions such as short circuits and collisions, causing combustion of the battery cells. This combustion releases significant amounts of heat. If not promptly addressed or handled improperly, this can cause the entire battery system to catch fire, potentially even causing an explosion, resulting in loss of life and property.

[0003] In recent years, spontaneous combustion of electric vehicles has become a frequent issue. Consequently, improving the safety of power batteries is crucial for the widespread adoption of new energy electric vehicles. Consequently, preventing or mitigating the occurrence of battery thermal runaway has become a major challenge in the electric vehicle industry.

[0004] Summary of the Invention

[0005] The embodiments of the present application provide a battery management system, an electric vehicle, and a power battery protection method, which can effectively protect the power battery.

[0006] According to one aspect of an embodiment of the present application, a battery management system is provided. The battery management system includes a detection board and a control board. The detection board is connected to the vehicle's power battery and is used to detect thermal runaway conditions in the power battery cells. The control board is connected to the detection board, which includes a power chip and a controller. The detection board is provided independently of the control board, the detection board is connected to the power chip, and the power chip is connected to the controller.

[0007] In an optional embodiment, when the battery management system is offline, when thermal runaway of the power battery cell is detected, the detection board is further used to generate a wake-up signal and wake up the controller through the power chip to enable the battery management system to operate.

[0008] In an optional embodiment, when thermal runaway occurs in the battery cell of the power battery, the controller is further configured to issue a thermal runaway alarm.

[0009] In an optional embodiment, the detection board includes a cell acquisition board, which is used to collect the battery cell voltage and / or temperature of the power battery online and / or offline according to a predetermined sampling period.

[0010] In an optional embodiment, the battery cell acquisition board is used to compare the collected battery cell voltage of the power battery with a predetermined voltage limit and / or the collected battery cell temperature of the power battery with a predetermined temperature limit, and generate the wake-up signal when the battery cell voltage of the power battery exceeds the predetermined voltage limit and / or the battery cell temperature of the power battery exceeds the predetermined temperature limit.

[0011] In an optional embodiment, the detection board further includes a high-voltage current acquisition board, and the high-voltage current acquisition board is used to collect the current of the power battery.

[0012] In an optional embodiment, the high-voltage current acquisition board is used to collect the voltage across a detection resistor connected in series in a load circuit, and the current of the power battery is obtained by collecting the voltage across the detection resistor. The load circuit includes the power battery and the load connected in series.

[0013] In an optional embodiment, when the collected current of the power battery exceeds the overcurrent protection current limit, the high-voltage current acquisition board is further used to generate an overcurrent hardware signal to the controller, and the controller is used to perform overcurrent protection on the power battery.

[0014] In an optional embodiment, when the collected current of the power battery exceeds the short-circuit protection current limit, the high-voltage current collection board is further used to generate a short-circuit hardware signal to the controller, and the controller is used to control the blowing of the explosive fuse connected in series in the load circuit.

[0015] In an optional embodiment, the control board also includes a low-voltage uninterruptible power supply and a pressure detection module, the low-voltage uninterruptible power supply is used to power the pressure detection module, the pressure detection module is connected to the power chip, and the pressure detection module is used to detect the pressure of the power battery online and / or offline.

[0016] In an optional embodiment, when the battery management system is offline, when the detected pressure of the power battery exceeds a predetermined pressure limit, the pressure detection module is further used to generate a wake-up signal and wake up the controller through the power chip to enable the battery management system to operate.

[0017] According to another aspect of the embodiments of the present application, an electric vehicle is provided, which includes the battery management system described in the above embodiments.

[0018] According to another aspect of an embodiment of the present application, a power battery protection method is provided. The method includes: detecting a thermal runaway state of a cell of an on-board power battery; generating a wake-up signal when a battery management system is offline and detecting thermal runaway of the power battery cell; and waking up the battery management system using the wake-up signal and issuing a thermal runaway alarm.

[0019] In an optional embodiment, the detecting of the thermal runaway state of the battery cell of the vehicle-mounted power battery includes: collecting the battery cell voltage and / or temperature of the power battery online and / or offline according to a predetermined sampling period; comparing the collected battery cell voltage of the power battery with a predetermined voltage limit and / or comparing the collected battery cell temperature of the power battery with a predetermined temperature limit; and when the battery cell voltage of the power battery exceeds the predetermined voltage limit and / or the battery cell temperature of the power battery exceeds the predetermined temperature limit, determining that the battery cell of the power battery has thermal runaway.

[0020] In an optional embodiment, detecting the thermal runaway state of the battery cell of the vehicle-mounted power battery includes: collecting the current of the power battery; when the collected current of the power battery exceeds the short-circuit protection current limit, determining that the battery cell of the power battery has thermal runaway.

[0021] In an optional embodiment, the method further includes: when the collected current of the power battery exceeds the overcurrent protection current limit, generating an overcurrent hardware signal to the battery management system to perform overcurrent protection on the power battery; and when the collected current of the power battery exceeds the short-circuit protection current limit, generating a short-circuit hardware signal to the battery management system, and the battery management system controls the blowing of an explosive fuse connected in series in a load circuit, wherein the load circuit includes the power battery and the load connected in series.

[0022] In an optional embodiment, detecting the thermal runaway state of the battery cells of the vehicle-mounted power battery includes: detecting the pressure of the power battery online and / or offline; comparing the detected pressure of the power battery with a predetermined pressure limit; and when the pressure of the power battery exceeds the predetermined pressure limit, determining that the battery cells of the power battery have thermal runaway.

[0023] The battery management system, electric vehicle, and power battery protection method of one or more embodiments of the present application can provide good protection for the power battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0025] FIG1 is a schematic block diagram of a battery management system according to an embodiment of the present application.

[0026] FIG2 is a block diagram of the internal structure of a control panel according to an embodiment of the present application.

[0027] FIG3 is a flow chart of a power battery protection method according to an embodiment of the present application.

[0028] FIG4 shows the specific steps of a power battery protection method according to a specific embodiment of the present application. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0030] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0031] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The singular forms "a", "said" and "the" used in this application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items. Unless otherwise indicated, similar words such as "front", "rear", "bottom" and / or "top" are only for ease of explanation and are not limited to one position or one spatial orientation. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, and can include electrical connections, whether direct or indirect. In this application, "can" can mean having the ability.

[0032] The following detailed description of various embodiments of the present application is given in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can be combined with each other.

[0033] An embodiment of the present application provides a battery management system (BMS, Battery Management System) 10. Figure 1 discloses a schematic block diagram of a battery management system 10 according to an embodiment of the present application. As shown in Figure 1, the battery management system 10 according to an embodiment of the present application includes a detection board and a control board 13, wherein the detection board is set independently of the control board 13. The detection board is connected to the vehicle-mounted power battery 20 and can be used to detect the thermal runaway state of the battery cells of the power battery 20. The control board 13 is connected to the detection board, and the control board 13 includes a power chip 131 and a controller 132. The power chip 131 can be used to power the entire BMS, and the power chip 131 is connected to the controller 132, wherein the detection board is connected to the power chip 131 in the control board 13.

[0034] The detection board can be used to detect thermal runaway conditions in the power battery 20. When the battery management system 10 is offline and detects thermal runaway in the power battery 20, the detection board can generate a wake-up signal and send it to the control board 13. The power chip 131 of the control board 13 is powered on and can wake up the controller 132 through the power chip 131. This activates the BMS 10 and subsequently wakes up the entire vehicle.

[0035] In some embodiments, when thermal runaway occurs in the cells of the power battery 20 , the controller 132 in the BMS may also issue a thermal runaway alarm, thereby providing corresponding early warning prompts to the driver and passengers.

[0036] In some embodiments, the detection board of the present application may include a cell acquisition board 11, which is provided independently of the control board 13 and connected to the power battery 20. Furthermore, the cell acquisition board 11 is connected to the power chip 131 of the control board 13. The cell acquisition board 11 can collect the cell voltage and / or temperature of the power battery 20 online and / or offline according to a predetermined sampling period.

[0037] The cell acquisition board 11 can compare the collected cell voltage of the power battery 20 with a predetermined voltage limit and / or the collected cell temperature of the power battery 20 with a predetermined temperature limit. If the cell voltage of the power battery 20 exceeds the predetermined voltage limit and / or the cell temperature of the power battery 20 exceeds the predetermined temperature limit, or if the battery management system 10 is offline, the board can generate a wake-up signal. For example, the cell acquisition board 11 can continuously monitor the cell voltage and / or temperature of the power battery 20 when the vehicle enters a dormant state. If the cell voltage of the power battery 20 exceeds a predetermined upper voltage limit or a predetermined lower voltage limit, and / or the cell temperature of the power battery 20 exceeds a predetermined upper temperature limit or a predetermined lower temperature limit, the board can generate a wake-up signal to power on the power chip 131 on the control board 13, waking up the controller 132 on the control board 13, activating the entire BMS 10, and ultimately waking up the vehicle. A thermal runaway alarm can also be issued.

[0038] The battery management system 10 of the embodiment of the present application can not only support online battery thermal runaway detection, but also support offline thermal runaway detection, and can also support immediate issuance of a thermal runaway alarm in the event of offline thermal runaway.

[0039] In some embodiments, the detection board of the present application may further include a high-voltage current acquisition board 12 , which is independently provided from the control board 13 . The high-voltage current acquisition board 12 may be used to collect the current of the power battery 20 .

[0040] As shown in Figure 1, a power battery 20 can be used to provide power to a load 40. The power battery 20 and the load 40, connected in series, form a load circuit. A sense resistor 50 is connected in series within the load circuit. In one embodiment, a high-voltage current acquisition board 12 can be used to acquire the voltage across the sense resistor 50 connected in series within the load circuit. By acquiring the voltage across the sense resistor 50, the current of the power battery 20 can be obtained.

[0041] In some embodiments, the battery management system 10 of the present invention can provide overcurrent protection. When the collected current of the power battery 20 exceeds the overcurrent protection current limit, the high-voltage current acquisition board 12 can generate an overcurrent hardware signal to the controller 132, which can then provide overcurrent protection for the power battery 20.

[0042] A pyrofuse 30 is also connected in series in the load circuit. The pyrofuse 30 is different from a traditional fuse in that it can be actively controlled. In addition, the pyrofuse 30 is low-cost. Therefore, the use of this pyrofuse can significantly reduce costs and improve competitiveness. In other embodiments, the battery management system 10 of the embodiment of the present application can also perform short-circuit protection. When the current of the power battery 20 collected exceeds the short-circuit protection current limit, the high-voltage current acquisition board 12 can generate a short-circuit hardware signal to the controller 132. The controller 132 can control the pyrofuse 30 connected in series in the load circuit to quickly blow. The pyrofuse 30 is disconnected, thereby disconnecting the high-voltage power supply of the entire vehicle and providing good short-circuit protection for the power battery 20.

[0043] The battery management system 10 of the embodiment of the present application not only supports overcurrent protection, but also supports short-circuit protection. Moreover, it can complete the short-circuit protection function in a relatively short time (for example, 5ms), cut off the high voltage of the entire vehicle, and protect the power battery 20.

[0044] FIG2 discloses a block diagram of the internal structure of the control board 13 according to an embodiment of the present application. As shown in FIG2 , in some embodiments, the control board 13 of the present application may further include a low-voltage uninterruptible power supply 133 and a pressure detection module 134. The low-voltage uninterruptible power supply 133 may be, for example, a 5V non-failure power supply. The low-voltage uninterruptible power supply 133 may be used to power the pressure detection module 134, which may detect the pressure of the power battery 20 online and / or offline. The pressure detection module 134 is connected to the power chip 131.

[0045] The pressure detection module 134 of the embodiment of the present application can still continuously detect the pressure of the power battery 20 when the entire vehicle enters the dormant state.

[0046] The pressure detection module 134 can compare the detected pressure of the power battery 20 with a predetermined pressure limit. If the pressure of the power battery 20 detected by the pressure detection module 134 exceeds the predetermined pressure limit and the battery management system 10 is offline, the pressure detection module 134 can generate a wake-up signal to power on the power chip 131, wake up the controller 132, and activate the entire BMS 10, thereby waking up the entire vehicle and issuing a thermal runaway alarm.

[0047] The battery management system 10 of the embodiment of the present application integrates the pressure detection module 134 into the control board 13, and continuously powers the pressure detection module 134 through the low-voltage uninterruptible power supply 133, so that the pressure of the power battery 20 can be detected in real time, and the fastest detection cycle can be achieved, for example, 10ms, and it can support online and / or offline pressure detection, and can also support offline self-wake-up function.

[0048] The battery management system 10 of the embodiment of the present application can perform all-round safety management and efficient detection of the power battery 20, and can realize full-scale open-air scene detection with high integration and low cost.

[0049] The battery management system 10 of the embodiment of the present application can efficiently ensure the personal safety of users, reduce the risk of thermal runaway of the entire vehicle, and preserve property safety by efficiently detecting the safety status of the power battery 20 .

[0050] The present application also provides an electric vehicle, which includes the battery management system 10 described in the above embodiments.

[0051] The electric vehicle of the embodiment of the present application has substantially similar beneficial technical effects to the battery management system 10 described above, and therefore, they will not be described in detail here.

[0052] The present application also provides a power battery protection method. FIG3 shows a flow chart of the power battery protection method according to one embodiment of the present application. As shown in FIG3 , the power battery protection method according to one embodiment of the present application may include steps S11 to S14.

[0053] In step S11 , a thermal runaway state of a cell of the vehicle-mounted power battery 20 may be detected.

[0054] In step S12, it is determined whether thermal runaway occurs in the cells of the power battery 20. If the result of the determination is yes, the process proceeds to step S13. Otherwise, the process returns to continue the detection.

[0055] In step S13 , when it is determined in step S12 that thermal runaway occurs in the cells of the power battery 20 , a wake-up signal may be generated when the battery management system 10 is offline.

[0056] In step S14 , the battery management system 10 may be awakened by the awakening signal generated in step S13 and a thermal runaway alarm may be issued.

[0057] In some embodiments, step S11 of detecting the thermal runaway state of the battery cells of the on-board power battery 20 may include: collecting the battery cell voltage and / or temperature of the power battery 20 online and / or offline according to a predetermined sampling period; comparing the collected battery cell voltage of the power battery 20 with a predetermined voltage limit and / or comparing the collected battery cell temperature of the power battery 20 with a predetermined temperature limit; and when the battery cell voltage of the power battery 20 exceeds the predetermined voltage limit and / or the battery cell temperature of the power battery 20 exceeds the predetermined temperature limit, determining that the battery cell of the power battery 20 has thermal runaway.

[0058] In some embodiments, detecting the thermal runaway state of the battery cells of the vehicle-mounted power battery 20 in step S11 may include: collecting the current of the power battery 20 ; and when the collected current of the power battery 20 exceeds the short-circuit protection current limit, determining that the battery cells of the power battery 20 have thermal runaway.

[0059] In some embodiments, the power battery protection method of the present application may further include: when the collected current of the power battery 20 exceeds the overcurrent protection current limit, an overcurrent hardware signal is generated to the battery management system 10 to perform overcurrent protection on the power battery 20; and when the collected current of the power battery 20 exceeds the short-circuit protection current limit, a short-circuit hardware signal is generated to the battery management system 10, and the battery management system 10 controls the blowing of the detonating fuse 30 connected in series in the load circuit, and the load circuit includes the power battery 20 and the load 40 connected in series.

[0060] In some embodiments, detecting the thermal runaway state of the battery cells of the vehicle-mounted power battery 20 in step S11 may include: detecting the pressure of the power battery 20 online and / or offline; comparing the detected pressure of the power battery 20 with a predetermined pressure limit; and when the detected pressure of the power battery 20 exceeds the predetermined pressure limit, determining that the battery cells of the power battery 20 have thermal runaway.

[0061] FIG4 illustrates the specific steps of a power battery protection method according to a specific embodiment of the present application. As shown in FIG4 , in step S21, the power battery 20 may be subjected to online and / or offline cell voltage and / or temperature detection according to a predetermined sampling period. In step S22, a determination is made as to whether the collected cell voltage of the power battery 20 exceeds a predetermined voltage limit, and / or whether the collected cell temperature of the power battery 20 exceeds a predetermined temperature limit. If the determination is yes, the process proceeds to step S23. Otherwise, the process returns. In step S23, if the cell voltage of the power battery 20 exceeds the predetermined voltage limit and / or the cell temperature of the power battery 20 exceeds the predetermined temperature limit, and the BMS 10 is offline, a wake-up signal is generated. In step S24, the BMS 10 is awakened by the wake-up signal. In step S25, the BMS 10 may issue a thermal runaway alarm.

[0062] In step S31, the current of the power battery 20 can be detected. In step S32, it is determined whether the collected current of the power battery 20 exceeds the overcurrent protection current limit. If the result of the determination is yes, the process proceeds to step S33. Otherwise, the process returns. In step S33, when the current of the power battery 20 exceeds the overcurrent protection current limit, an overcurrent hardware signal is generated to the BMS 10. In step S34, the BMS 10 can perform overcurrent protection on the power battery 20. In step S35, it is further determined whether the collected current of the power battery 20 exceeds the short-circuit protection current limit. If the result of the determination is yes, the process proceeds to step S36. Otherwise, the process returns. In step S36, when the current of the power battery 20 exceeds the short-circuit protection current limit, a short-circuit hardware signal is generated to the BMS 10. In step S37 , the BMS 10 may control the pyrofuse 30 connected in series in the load circuit to quickly blow, thereby protecting the power battery 20 from overcurrent.

[0063] In step S41, the power battery 20 may be subjected to online and / or offline pressure testing. In step S42, it is determined whether the collected pressure of the power battery 20 exceeds a predetermined pressure limit. If the result of the determination is yes, the process proceeds to step S43. Otherwise, the process returns. In step S43, when the pressure of the power battery 20 exceeds the predetermined pressure limit and the BMS 10 is offline, a wake-up signal is generated. In step S44, the BMS 10 is awakened by the wake-up signal. In step S45, the BMS 10 may issue a thermal runaway alarm.

[0064] The power battery protection method of the embodiment of the present application can provide good and multi-faceted safety protection functions for the power battery.

[0065] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. The terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a..." does not exclude the presence of other identical elements in the process, method, article or device that includes the element.

[0066] The battery management system, electric vehicle, and power battery protection method provided in the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core ideas of the present application. The content of this specification should not be understood as limiting the present application. At the same time, for those of ordinary skill in the art, based on the ideas of the present application, any modifications, equivalent replacements, or improvements can be made to the specific implementation methods and application scopes, which should all be included within the scope of the claims of the present application.

Claims

1. A battery management system, characterized in that: include: A detection board, connected to the vehicle-mounted power battery, for detecting a thermal runaway state of a cell of the power battery; as well as A control board is connected to the detection board, and the control board includes a power chip and a controller. Wherein, the detection board is arranged independently from the control board, the detection board is connected to the power chip, and the power chip is connected to the controller.

2. The battery management system according to claim 1, characterized in that: When the battery management system is offline, when it is detected that the battery cell of the power battery has thermal runaway, the detection board is further used to generate a wake-up signal, and wake up the controller through the power chip to enable the battery management system to work.

3. The battery management system according to claim 2, characterized in that: When thermal runaway occurs in the battery cell of the power battery, the controller is also used to issue a thermal runaway alarm.

4. The battery management system according to claim 2, characterized in that: The detection board includes a battery cell collection board, and the battery cell collection board is used to collect the battery cell voltage and / or temperature of the power battery online and / or offline according to a predetermined sampling period.

5. The battery management system according to claim 4, characterized in that: The battery cell acquisition board is used to compare the collected battery cell voltage of the power battery with a predetermined voltage limit and / or the collected battery cell temperature of the power battery with a predetermined temperature limit, and generate the wake-up signal when the battery cell voltage of the power battery exceeds the predetermined voltage limit and / or the battery cell temperature of the power battery exceeds the predetermined temperature limit, and when the battery management system is offline.

6. The battery management system according to claim 2, characterized in that: The detection board also includes a high-voltage current collection board, and the high-voltage current collection board is used to collect the current of the power battery.

7. The battery management system according to claim 6, characterized in that: The high-voltage current acquisition board is used to collect the voltage across the detection resistor connected in series in the load circuit, and the current of the power battery is obtained by collecting the voltage across the detection resistor. The load circuit includes the power battery and the load connected in series.

8. The battery management system according to claim 6, characterized in that: When the collected current of the power battery exceeds the overcurrent protection current limit, the high-voltage current collection board is further used to generate an overcurrent hardware signal to the controller, and the controller is used to perform overcurrent protection on the power battery.

9. The battery management system according to claim 6 or 8, characterized in that: When the collected current of the power battery exceeds the short-circuit protection current limit, the high-voltage current collection board is also used to generate a short-circuit hardware signal to the controller, and the controller is used to control the blowing of the explosive fuse connected in series in the load circuit.

10. The battery management system according to claim 1, characterized in that: The control board also includes a low-voltage uninterruptible power supply and a pressure detection module. The low-voltage uninterruptible power supply is used to power the pressure detection module. The pressure detection module is connected to the power chip. The pressure detection module is used to detect the pressure of the power battery online and / or offline.

11. The battery management system according to claim 10, characterized in that: When the battery management system is offline, when the detected pressure of the power battery exceeds a predetermined pressure limit, the pressure detection module is further used to generate a wake-up signal and wake up the controller through the power chip to enable the battery management system to work.

12. An electric vehicle, characterized in that: The invention comprises a battery management system as claimed in any one of claims 1 to 11.

13. A power battery protection method, characterized in that: include: Detect thermal runaway of the battery cells of the vehicle power battery; When the battery management system is offline, when it is detected that the battery cell of the power battery has thermal runaway, a wake-up signal is generated; as well as The battery management system is awakened by the wake-up signal to start operation and issue a thermal runaway alarm.

14. The method according to claim 13, characterized in that The detecting of the thermal runaway state of the battery cell of the vehicle power battery comprises: Collecting the battery cell voltage and / or temperature of the power battery online and / or offline according to a predetermined sampling period; comparing the collected battery cell voltage of the power battery with a predetermined voltage limit and / or comparing the collected battery cell temperature of the power battery with a predetermined temperature limit; and When the battery cell voltage of the power battery exceeds the predetermined voltage limit and / or the battery cell temperature of the power battery exceeds the predetermined temperature limit, it is determined that the battery cell of the power battery has thermal runaway.

15. The method according to claim 13, characterized in that The detecting of the thermal runaway state of the battery cell of the vehicle power battery comprises: collecting the current of the power battery; When the collected current of the power battery exceeds the short-circuit protection current limit, it is determined that thermal runaway occurs in the cell of the power battery.

16. The method according to claim 15, characterized in that Also includes: When the collected current of the power battery exceeds the overcurrent protection current limit, an overcurrent hardware signal is generated to the battery management system to perform overcurrent protection on the power battery; and When the collected current of the power battery exceeds the short-circuit protection current limit, a short-circuit hardware signal is generated to the battery management system, and the battery management system controls the blown explosive fuse connected in series in the load circuit, wherein the load circuit includes the power battery and the load connected in series.

17. The method according to claim 13, characterized in that The detecting of the thermal runaway state of the battery cell of the vehicle power battery comprises: Detecting the pressure of the power battery online and / or offline; comparing the detected pressure of the power battery with a predetermined pressure limit; and When the pressure of the power battery exceeds the predetermined pressure limit, it is determined that thermal runaway occurs in the battery cell of the power battery.

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