CN116093472A - Protection method and device for power battery - Google Patents

Abstract

The application discloses a protection method and device for a power battery, and relates to the technical field of power batteries. The method comprises the following steps: when the BMS system is in a dormant state, battery parameters corresponding to the power battery are collected; determining whether the power battery fails according to battery parameters corresponding to the power battery; and if the power battery is determined to be faulty, waking up the power chip, so that after the power chip is woken up, waking up the main chip, and waking up the BMS system by the main chip.

Description

Protection method and device for power battery

technical field

The present application relates to the technical field of power batteries, in particular to a method and device for protecting a power battery.

Background technique

In order to ensure the safety of the power battery, the highest level of battery performance testing is required for the power battery, for example, thermal runaway detection of the power battery.

Among them, after the electric vehicle is parked or turned off, the battery management system (Battery Management System, BMS) enters the dormant state. During the process of the BMS system being in the dormant state, the main chip in the BMS system automatically wakes up periodically and wakes up the entire BMS system. Then the BMS system detects the thermal runaway of the power battery; since the main chip is automatically woken up periodically, when the power battery fails, the BMS system may not be able to detect the thermal runaway of the power battery in time.

Contents of the invention

The embodiments of the present application provide a power battery protection method and device, the main purpose of which is to ensure that the BMS system detects thermal runaway of the power battery in a timely manner.

In order to solve the above technical problems, the embodiments of the present application provide the following technical solutions:

In the first aspect, the present application provides a power battery protection method, the method is applied to a target chip, and the method includes:

When the BMS system is in a dormant state, collect battery parameters corresponding to the power battery;

Determine whether the power battery is faulty according to the battery parameters corresponding to the power battery;

If it is determined that the power battery fails, wake up the power chip, so that after the power chip is woken up, it wakes up the main chip, and the main chip wakes up the BMS system.

Optionally, the target chip is specifically a target slave board acquisition chip, and the battery parameter corresponding to the power battery is the voltage value corresponding to each battery cell included in the power battery; Battery parameters determine if the traction battery is faulty, including:

determining the maximum voltage value and the minimum voltage value corresponding to a plurality of the battery cells according to the voltage value corresponding to each of the battery cells;

judging whether the maximum voltage values corresponding to the multiple battery cells are greater than the maximum voltage threshold;

If so, it is determined that the power battery is faulty;

If not, judging whether the minimum voltage values corresponding to the plurality of battery cells are less than the minimum voltage threshold;

If so, it is determined that the power battery is faulty;

If not, it is determined that the power battery is not faulty.

Optionally, the target chip is specifically a target slave board acquisition chip, and the battery parameter corresponding to the power battery is the temperature value corresponding to each battery cell included in the power battery; Battery parameters determine if the traction battery is faulty, including:

determining the maximum temperature values corresponding to multiple battery cells according to the temperature values corresponding to each of the battery cells;

judging whether the maximum temperature values corresponding to the plurality of battery cells are greater than a maximum temperature threshold;

If so, it is determined that the power battery is faulty;

If not, it is determined that the power battery is not faulty.

Optionally, the target chip is specifically a target slave board acquisition chip, and the battery parameter corresponding to the power battery is a plurality of on-board temperature values corresponding to the balance circuit board included in the power battery; The corresponding battery parameters determine whether the power battery is faulty, including:

determining a maximum on-board temperature value corresponding to the equalizing circuit board according to a plurality of on-board temperature values corresponding to the equalizing circuit board;

Judging whether the equalization circuit board is turned on before the BMS system enters the dormant state;

If it is turned on, it is judged whether the maximum onboard temperature value corresponding to the equalization circuit board is greater than the first onboard temperature threshold; if so, it is determined that the power battery is faulty; if not, it is judged that the power battery is not faulty;

If it is not turned on, it is judged whether the maximum on-board temperature value corresponding to the balancing circuit board is greater than the second on-board temperature threshold; if so, it is determined that the power battery is faulty; if not, it is judged that the power battery is not faulty .

Optionally, the target chip is specifically a pressure sensor chip, and the battery parameter corresponding to the power battery is the current pressure value in the bag corresponding to the power battery; the power is determined according to the battery parameter corresponding to the power battery. Whether the battery is faulty, including:

Determine the current pressure rise rate corresponding to the power battery according to the current pressure value in the battery pack and the historical pressure value in the battery pack corresponding to the power battery, wherein the historical pressure value in the battery pack corresponding to the power battery is before the pressure sensor chip The pressure value in the bag corresponding to the power battery obtained in one collection;

Determine whether the multiple pressure rise rates corresponding to the power battery within the target time period are all greater than a preset pressure rise rate threshold according to the current pressure rise rate and multiple historical pressure rise rates corresponding to the power battery, wherein the power battery The corresponding multiple historical pressure rise rates are the pressure rise rates corresponding to the power battery determined N times before by the pressure sensor chip;

If so, it is determined that the power battery is faulty;

If not, it is determined that the power battery is not faulty.

Optionally, the target chip is specifically a pressure sensor chip, and the battery parameter corresponding to the power battery is the current pressure value in the bag corresponding to the power battery; the power is determined according to the battery parameter corresponding to the power battery. Whether the battery is faulty, including:

Determine the current pressure increase value corresponding to the power battery according to the current pressure value in the bag corresponding to the power battery and the reference pressure value in the bag;

Determine whether the multiple pressure growth values corresponding to the power battery within the target time period are all greater than a preset pressure growth threshold according to the current pressure growth value corresponding to the power battery and a plurality of historical pressure growth values, wherein the power battery corresponds to The multiple historical pressure growth values of the pressure sensor chip are the pressure growth values corresponding to the power battery determined N times before;

If so, it is determined that the power battery is faulty;

If not, it is determined that the power battery is not faulty.

Optionally, the wake-up power chip includes:

Send the reverse wake-up flag bit to the daisy chain communication chip through the daisy chain to wake up the daisy chain communication chip, so that the daisy chain communication chip wakes up the power supply chip after determining that the target slave board acquisition chip has reverse wakeup authority, by The power chip wakes up the main chip, and the main chip wakes up the BMS system.

In the second aspect, the present application also provides a power battery protection device, the device is applied to the target chip, and the device includes:

The collection unit is used to collect battery parameters corresponding to the power battery when the BMS system is in a dormant state;

a determining unit, configured to determine whether the power battery is faulty according to battery parameters corresponding to the power battery;

The wake-up unit is configured to wake up the power chip when it is determined that the power battery fails, so that after the power chip is woken up, it wakes up the main chip, and the main chip wakes up the BMS system.

Optionally, the target chip is specifically a target slave board acquisition chip, and the battery parameter corresponding to the power battery is the voltage value corresponding to each battery cell included in the power battery;

The determination unit is specifically configured to: determine the maximum voltage value and the minimum voltage value corresponding to a plurality of the battery cells according to the voltage value corresponding to each of the battery cells;

judging whether the maximum voltage values corresponding to the multiple battery cells are greater than the maximum voltage threshold;

If so, it is determined that the power battery is faulty;

If not, judging whether the minimum voltage values corresponding to the plurality of battery cells are less than the minimum voltage threshold;

If so, it is determined that the power battery is faulty;

If not, it is determined that the power battery is not faulty.

Optionally, the target chip is specifically a target slave board acquisition chip, and the battery parameter corresponding to the power battery is a temperature value corresponding to each battery cell included in the power battery;

The determining unit is specifically configured to: determine the maximum temperature values corresponding to multiple battery cells according to the temperature value corresponding to each of the battery cells;

judging whether the maximum temperature values corresponding to the plurality of battery cells are greater than a maximum temperature threshold;

If so, it is determined that the power battery is faulty;

If not, it is determined that the power battery is not faulty.

Optionally, the target chip is specifically a target slave board acquisition chip, and the battery parameter corresponding to the power battery is a plurality of on-board temperature values corresponding to the balance circuit board included in the power battery;

The determining unit is specifically configured to: determine the maximum on-board temperature value corresponding to the equalizing circuit board according to the multiple on-board temperature values corresponding to the equalizing circuit board;

Judging whether the equalization circuit board is turned on before the BMS system enters the dormant state;

If it is turned on, it is judged whether the maximum onboard temperature value corresponding to the equalization circuit board is greater than the first onboard temperature threshold; if so, it is determined that the power battery is faulty; if not, it is judged that the power battery is not faulty;

If it is not turned on, it is judged whether the maximum on-board temperature value corresponding to the balancing circuit board is greater than the second on-board temperature threshold; if so, it is determined that the power battery is faulty; if not, it is judged that the power battery is not faulty .

Optionally, the target chip is specifically a pressure sensor chip, and the battery parameter corresponding to the power battery is the current pressure value in the bag corresponding to the power battery;

The determining unit is specifically configured to: determine the current pressure rise rate corresponding to the power battery according to the current pressure value in the bag corresponding to the power battery and the historical pressure value in the bag, wherein the historical bag corresponding to the power battery The pressure value is the pressure value in the bag corresponding to the power battery obtained by the pressure sensor chip in the previous acquisition;

Determine whether the multiple pressure rise rates corresponding to the power battery within the target time period are all greater than a preset pressure rise rate threshold according to the current pressure rise rate and multiple historical pressure rise rates corresponding to the power battery, wherein the power battery The corresponding multiple historical pressure rise rates are the pressure rise rates corresponding to the power battery determined N times before by the pressure sensor chip;

If so, it is determined that the power battery is faulty;

If not, it is determined that the power battery is not faulty.

Optionally, the target chip is specifically a pressure sensor chip, and the battery parameter corresponding to the power battery is the current pressure value in the bag corresponding to the power battery;

The determining unit is specifically configured to: determine the current pressure increase value corresponding to the power battery according to the current pressure value in the bag corresponding to the power battery and the reference pressure value in the bag;

Determine whether the multiple pressure growth values corresponding to the power battery within the target time period are all greater than a preset pressure growth threshold according to the current pressure growth value corresponding to the power battery and a plurality of historical pressure growth values, wherein the power battery corresponds to The multiple historical pressure growth values of the pressure sensor chip are the pressure growth values corresponding to the power battery determined N times before;

If so, it is determined that the power battery is faulty;

If not, it is determined that the power battery is not faulty.

Optionally, the wake-up unit is specifically configured to send a reverse wake-up flag to the daisy chain communication chip through the daisy chain to wake up the daisy chain communication chip, so that the daisy chain communication chip determines that the target slave board acquisition chip After having the reverse wake-up permission, wake up the power chip, the power chip wakes up the main chip, and the main chip wakes up the BMS system.

In the third aspect, the embodiment of the present application provides a storage medium, the storage medium includes a stored program, wherein, when the program is running, the device where the storage medium is located is controlled to execute the power battery operation described in the first aspect. protection method.

In the fourth aspect, the embodiment of the present application provides a power battery protection device, the device includes a storage medium; and one or more processors, the storage medium is coupled to the processor, and the processor is controlled by It is configured to execute the program instructions stored in the storage medium; when the program instructions run, the power battery protection method described in the first aspect is executed.

By means of the above technical solution, the technical solution provided by the present application has at least the following advantages:

The present application provides a power battery protection method and device. The present application can collect the battery parameters corresponding to the power battery by the target chip when the BMS system is in a dormant state, and determine whether the power battery is faulty according to the battery parameters corresponding to the power battery; When it is determined that the power battery is faulty according to the battery parameters corresponding to the power battery, the target chip wakes up the power chip in the reverse direction. After the power chip is woken up, it wakes up the main chip. After the main chip is woken up, it wakes up the BMS system. Thermal runaway detection, so as to achieve the effect of reversely waking up the BMS system through the target chip when the power battery fails, and then realize the effect that the BMS system can detect the thermal runaway of the power battery in time when the power battery fails.

The above description is only an overview of the technical solution of the present application. In order to better understand the technical means of the present application, it can be implemented according to the contents of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and understandable , the following specifically cites the specific implementation manner of the present application.

Description of drawings

The above and other objects, features and advantages of the exemplary embodiments of the present application will become readily understood by reading the following detailed description with reference to the accompanying drawings. In the accompanying drawings, several embodiments of the present application are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

Fig. 1 shows a flow chart of a crop yield estimation method provided by the embodiment of the present application;

Fig. 2 shows a block diagram of a crop yield estimation device provided by an embodiment of the present application.

Detailed ways

Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided for thorough understanding of the application and to fully convey the scope of the application to those skilled in the art.

It should be noted that, unless otherwise specified, technical terms or scientific terms used in this application shall have the usual meanings understood by those skilled in the art to which this application belongs.

The embodiment of the present application provides a power battery protection method, the method is applied to the target chip, as shown in Figure 1, the method includes:

101. When the BMS system is in a dormant state, collect battery parameters corresponding to the power battery.

It should be noted that, in the embodiment of the present application, the execution subject in each step is the target chip in the electric vehicle, where there are multiple slave board acquisition chips and one pressure sensor chip in the electric vehicle, and the target chip can be multiple Any one of the two slave board acquisition chips (ie, the target slave board acquisition chip), the target chip may also be a pressure sensor chip, which is not specifically limited in this embodiment of the present application.

Wherein, when the target chip is specifically the target chip collected from the board, the battery parameters corresponding to the collected power battery may be but not limited to: the voltage value corresponding to each battery cell contained in the power battery, the voltage value of each battery contained in the power battery Any one or more of the temperature value corresponding to the monomer, the multiple on-board temperature values corresponding to the balance circuit board included in the power battery, etc.; when the target chip is specifically a pressure sensor chip, the battery corresponding to the collected power battery The parameter can be but not limited to: the current pressure value in the bag corresponding to the power battery.

In the embodiment of the present application, after the electric vehicle is parked or turned off, the BMS system enters the dormant state; when the BMS system is in the dormant state, the target chip can collect the battery parameters corresponding to the power battery.

102. Determine whether the power battery is faulty according to the battery parameters corresponding to the power battery.

In the embodiment of the present application, after the battery parameters corresponding to the power battery are collected, the target chip can determine whether the power battery is faulty according to the battery parameters corresponding to the power battery.

103. If it is determined that the power battery is faulty, wake up the power chip, so that after the power chip is woken up, it will wake up the main chip, and the main chip will wake up the BMS system.

In the embodiment of this application, when the power battery is determined to be faulty according to the battery parameters corresponding to the power battery, the target chip can reversely wake up the power chip. After the power chip is woken up, it will wake up the main chip. After the main chip is woken up, It will wake up the BMS system, and the BMS system will detect the thermal runaway of the power battery, so as to realize the effect of reversely waking up the BMS system through the target chip when the power battery fails, and then realize that when the power battery fails, the BMS system can timely The effect of thermal runaway detection on power batteries.

The embodiment of the present application provides a power battery protection method. The embodiment of the present application can collect the battery parameters corresponding to the power battery by the target chip when the BMS system is in the dormant state, and determine whether the power battery appears or not according to the battery parameters corresponding to the power battery. Fault; when the power battery is determined to be faulty according to the battery parameters corresponding to the power battery, the target chip reversely wakes up the power chip, and after the power chip is woken up, it wakes up the main chip. The battery performs thermal runaway detection, so as to achieve the effect of reversely waking up the BMS system through the target chip when the power battery fails, and then realize the effect that the BMS system can detect the thermal runaway of the power battery in time when the power battery fails.

Further, in the embodiment of the present application, when the target chip is specifically the target chip collected from the board, and the collected battery parameters are specifically the voltage value corresponding to each battery cell contained in the power battery, the target chip is based on the corresponding voltage value of the power battery. The specific process of battery parameters to determine whether the power battery is faulty is as follows: First, determine the maximum voltage value and minimum voltage value corresponding to multiple battery cells according to the voltage value corresponding to each battery cell, that is, the largest voltage value among the multiple voltage values The voltage value is determined as the maximum voltage value corresponding to multiple battery cells, and the voltage value with the smallest value among the multiple voltage values is determined as the minimum voltage value corresponding to multiple battery cells; secondly, determine the maximum voltage value corresponding to multiple battery cells. Whether the voltage value is greater than the maximum voltage threshold; if so, it is determined that the power battery is faulty; if not, it is judged whether the minimum voltage value corresponding to multiple battery cells is less than the minimum voltage threshold; if so, it is determined that the power battery is faulty; if not, Then it is determined that the power battery is not faulty.

Among them, the target slave board acquisition chip can determine the maximum voltage threshold in any of the following two ways:

(1) Before the BMS system enters the dormant state, the target slave board acquisition chip collects the voltage value corresponding to each battery cell, and determines the maximum voltage value corresponding to multiple battery cells, and the maximum voltage value corresponding to multiple battery cells Substituting the value into the first preset formula to obtain a preselected maximum voltage threshold, multiple preselected maximum voltage thresholds can be obtained according to the above method, and the preselected maximum voltage threshold with the largest value among the multiple preselected maximum voltage thresholds is determined as the maximum voltage threshold; wherein , the first preset formula is as follows:

Max_V={4300mv (PackMax_V<4250mv),

PackMax_V+50mv(PackMax_V＞4250mv)}

Wherein, Max_V is the preselected maximum voltage threshold, and PackMax_V is the maximum voltage value corresponding to multiple battery cells.

(2) Before the BMS system enters the sleep state, the target slave board acquisition chip collects the voltage value corresponding to each battery cell, and determines the maximum voltage value corresponding to multiple battery cells, and receives the information determined by each other slave board acquisition chip The maximum voltage value corresponding to multiple battery cells, according to the maximum voltage value corresponding to multiple battery cells determined by itself and the maximum voltage value corresponding to multiple battery cells determined by each other slave board acquisition chip, determine multiple battery cells The target maximum voltage value corresponding to a single cell, the maximum voltage value corresponding to multiple battery cells determined by itself and the target maximum voltage value corresponding to multiple battery cells are substituted into the second preset formula to obtain a preselected maximum voltage threshold, Multiple preselected maximum voltage thresholds can be obtained according to the above method, and the preselected maximum voltage threshold with the largest numerical value among the multiple preselected maximum voltage thresholds is determined as the maximum voltage threshold; wherein, the target maximum voltage values corresponding to multiple battery cells are the target slave board The maximum voltage value corresponding to the multiple battery cells determined by the acquisition chip and the maximum voltage value corresponding to the multiple battery cells determined by each other slave board acquisition chip; wherein, the BMS system is in the sleep state Before, every other slave board acquisition chip will also collect the voltage value corresponding to each battery cell, and determine the maximum voltage value corresponding to multiple battery cells; wherein, the second preset formula is as follows:

Max_V＝Min(ChipMax_V+500mv, PackMax_V+100mv)

Among them, Max_V is the preselected maximum voltage threshold, ChipMax_V is the target maximum voltage value corresponding to multiple battery cells, and PackMax_V is the maximum voltage value corresponding to multiple battery cells determined by the target slave board acquisition chip.

Among them, the target slave board acquisition chip can determine the minimum voltage threshold in any of the following two ways:

(1) Before the BMS system enters the dormant state, the target slave board acquisition chip collects the voltage value corresponding to each battery cell, and determines the minimum voltage value corresponding to multiple battery cells, and the minimum voltage value corresponding to multiple battery cells Substituting the value into the third preset formula to obtain a preselected minimum voltage threshold, multiple preselected minimum voltage thresholds can be obtained according to the above method, and the preselected minimum voltage threshold with the smallest value among the multiple preselected minimum voltage thresholds is determined as the minimum voltage threshold; wherein , the third preset formula is as follows:

Min_V＝Min(PackMin_V-500mv, secondary undervoltage alarm voltage value)

Wherein, Min_V is the preselected minimum voltage threshold, PackMin_V is the minimum voltage value corresponding to multiple battery cells, and the voltage value of the secondary undervoltage alarm can be but not limited to: 2.5V, 2.6V or 2.7V.

(2) Before the BMS system enters the dormant state, the target slave board acquisition chip collects the voltage value corresponding to each battery cell, and determines the minimum voltage value corresponding to multiple battery cells, and receives the information determined by each other slave board acquisition chip The minimum voltage value corresponding to multiple battery cells,

According to the minimum voltage values corresponding to multiple battery cells determined by itself and the minimum voltage values corresponding to multiple battery cells determined by each other slave board acquisition chip, determine the target minimum voltage values corresponding to multiple battery cells. The target minimum voltage value corresponding to each battery cell is substituted into the fourth preset formula to obtain a preselected minimum voltage threshold. According to the above method, multiple preselected minimum voltage thresholds can be obtained, and the preselected minimum value with the smallest value among the multiple preselected minimum voltage thresholds The voltage threshold is determined as the minimum voltage threshold; wherein, the target minimum voltage values corresponding to multiple battery cells are the minimum voltage values corresponding to the multiple battery cells determined by the target slave board acquisition chip and the multiple battery cells determined by each other slave board acquisition chip. The minimum voltage value with the smallest value among the minimum voltage values corresponding to each battery cell; among them, before the BMS system enters the dormant state, each other slave board acquisition chip will also collect the voltage value corresponding to each battery cell, and determine how many The minimum voltage value corresponding to a battery cell; wherein, the fourth preset formula is specifically as follows:

Min_V=ChipMin_V-500mv

Wherein, Min_V is a preselected minimum voltage threshold, and ChipMin_V is a target minimum voltage value corresponding to multiple battery cells.

Further, in the embodiment of the present application, when the target chip is specifically the target chip collected from the board, and the collected battery parameters are specifically the temperature values corresponding to each battery cell contained in the power battery, the target chip is The specific process of battery parameters to determine whether the power battery is faulty is as follows: First, determine the maximum temperature value corresponding to multiple battery cells according to the temperature value corresponding to each battery cell, that is, determine the temperature value with the largest value among the multiple temperature values as The maximum temperature values corresponding to multiple battery cells; secondly, determine whether the maximum temperature values corresponding to multiple battery cells are greater than the maximum temperature threshold; if so, determine that the power battery is faulty; if not, determine that the power battery is not faulty.

Among them, the target slave board acquisition chip can determine the maximum temperature threshold in any of the following two ways:

(1) Before the BMS system enters the dormant state, the target slave board acquisition chip collects the temperature value corresponding to each battery cell, and determines the maximum temperature value corresponding to multiple battery cells, and the maximum temperature value corresponding to multiple battery cells The value is substituted into the fifth preset formula to obtain a preselected maximum temperature threshold, multiple preselected maximum temperature thresholds can be obtained according to the above method, and the preselected maximum temperature threshold with the largest numerical value among the multiple preselected maximum temperature thresholds is determined as the maximum temperature threshold; wherein , the fifth preset formula is as follows:

Max_T={48°C (PackMax_T<46°C),

PackMax_T+5℃(PackMax_T≥46℃)}

Wherein, Max_T is the preselected maximum temperature threshold, and PackMax_T is the maximum temperature value corresponding to multiple battery cells.

(2) Before the BMS system enters the dormant state, the target slave board acquisition chip collects the temperature value corresponding to each battery cell, and determines the maximum temperature value corresponding to multiple battery cells, and receives the temperature value determined by each other slave board acquisition chip The maximum temperature value corresponding to multiple battery cells, according to the maximum temperature value corresponding to multiple battery cells determined by itself and the maximum temperature value corresponding to multiple battery cells determined by each other slave board acquisition chip, determine multiple battery cells The target maximum temperature value corresponding to a single cell, the maximum temperature value corresponding to multiple battery cells determined by itself and the target maximum temperature value corresponding to multiple battery cells are substituted into the sixth preset formula to obtain a preselected maximum temperature threshold, Multiple preselected maximum temperature thresholds can be obtained according to the above method, and the preselected maximum temperature threshold with the largest numerical value among the multiple preselected maximum temperature thresholds is determined as the maximum temperature threshold; wherein, the target maximum temperature values corresponding to multiple battery cells are the target slave board The maximum temperature value corresponding to the multiple battery cells determined by the acquisition chip and the maximum temperature value of the maximum temperature values corresponding to the multiple battery cells determined by each other slave board acquisition chip; wherein, the BMS system is in the sleep state Before, every other slave board acquisition chip will also collect the temperature value corresponding to each battery cell, and determine the maximum temperature value corresponding to multiple battery cells; where the sixth preset formula is as follows:

Max_T＝ChipMax_T+2℃

Wherein, Max_T is a preselected maximum temperature threshold, and ChipMax_T is a target maximum temperature value corresponding to multiple battery cells.

Further, in the embodiment of the present application, when the target chip is specifically the chip collected from the target slave board, and the collected battery parameters are specifically multiple on-board temperature values corresponding to the balanced circuit board included in the power battery, the target chip Corresponding battery parameters The specific process of determining whether the power battery is faulty is as follows: First, determine the maximum onboard temperature value corresponding to the balanced circuit board according to the multiple onboard temperature values corresponding to the balanced circuit board, that is, the value among the multiple onboard temperature values The maximum onboard temperature value is determined as the maximum onboard temperature value corresponding to the balanced circuit board, where there are multiple temperature collection points on the balanced circuit board, and the multiple onboard temperature values corresponding to the balanced circuit board are multiple temperature collection points secondly, determine whether the balance circuit board is turned on before the BMS system enters the dormant state; if it is turned on, then determine whether the maximum onboard temperature value corresponding to the balance circuit board is greater than the first onboard temperature threshold; The power battery is faulty; if not, it is determined that the power battery is not faulty; if it is not turned on, it is judged whether the maximum onboard temperature value corresponding to the equalization circuit board is greater than the second onboard temperature threshold; if so, it is determined that the power battery is faulty; If not, it is determined that the power battery is not faulty.

Wherein, the second onboard temperature threshold is a preset value, which can be but not limited to: 105°C, 110°C, or 120°C, etc.; the specific method for determining the first onboard temperature threshold by the target slave board acquisition chip is: in the BMS system Before entering the dormant state, the target slave board acquisition chip collects multiple on-board temperature values corresponding to the balanced circuit board, and determines the maximum on-board temperature value corresponding to the balanced circuit board, and substitutes the maximum on-board temperature value corresponding to the balanced circuit board into the seventh Preset the formula to obtain a pre-selected on-board temperature threshold, according to the above method, multiple pre-selected on-board temperature thresholds can be obtained, and the pre-selected on-board temperature threshold with the largest value among the multiple pre-selected on-board temperature thresholds is determined as the first on-board temperature threshold; wherein, the seventh preset formula is specifically as follows:

Max_NT＝A+10℃

Among them, Max_NT is the pre-selected onboard temperature threshold, and A is the maximum onboard temperature value corresponding to the balanced circuit board.

Further, in the embodiment of the present application, when the target chip is specifically a pressure sensor chip, and the collected battery parameters are specifically the current internal pressure value corresponding to the power battery, the target chip determines whether the power battery is The specific process of failure is as follows: First, determine the current pressure rise rate corresponding to the power battery according to the current pressure value in the bag corresponding to the power battery and the historical pressure value in the bag, where the historical pressure value in the bag corresponding to the power battery is the pressure sensor chip The pressure value in the bag corresponding to the power battery obtained in the previous collection; secondly, according to the current pressure rise rate corresponding to the power battery and multiple historical pressure rise rates, determine whether the multiple pressure rise rates corresponding to the power battery within the target time period are all greater than the expected value. Set the pressure rise rate threshold, where the preset pressure rise rate threshold can be but not limited to: 2KPa/s, 3KPa/s or 4KPa/s, etc., and the target time period can be but not limited to: 2S before the current moment, the current moment 3S before or 4S before the current moment, etc. The current moment is the moment to determine the current pressure rise rate, and the multiple historical pressure rise rates corresponding to the power battery are the pressure rise rates corresponding to the power battery determined N times before the pressure sensor chip, N is positive Integer; if yes, it is determined that the power battery is faulty; if not, it is determined that the power battery is not faulty.

Further, in the embodiment of the present application, when the target chip is specifically a pressure sensor chip, and the collected battery parameters are specifically the current internal pressure value corresponding to the power battery, the target chip determines whether the power battery is The specific process of failure is as follows: First, determine the current pressure increase value corresponding to the power battery according to the current pressure value in the bag corresponding to the power battery and the reference pressure value in the bag, that is, calculate the difference between the current pressure value in the bag corresponding to the power battery and the reference bag pressure value. The difference of the pressure value is determined as the current pressure increase value corresponding to the power battery; secondly, according to the current pressure increase value corresponding to the power battery and a plurality of historical pressure increase values to determine the multiple pressure values corresponding to the power battery within the target time period Whether the pressure growth values are greater than the preset pressure growth threshold, wherein the multiple historical pressure growth values corresponding to the power battery are the pressure growth values corresponding to the power battery determined N times before the pressure sensor chip; if so, it is determined that the power battery is faulty; If not, it is determined that the power battery is not faulty.

Further, in the embodiment of this application, when the target chip is specifically the target slave board acquisition chip, the specific process for the target chip to wake up the power supply chip is: send the reverse wake-up flag to the daisy chain communication chip through the daisy chain, thereby waking up the daisy chain Chain communication chip, after the daisy chain communication chip is awakened, it will judge whether the target slave board acquisition chip has the authority to wake up the BMS system reversely. When the daisy chain communication chip determines that the target slave board acquisition chip has the reverse wakeup authority, the daisy chain The communication chip will wake up the power chip. After the power chip is woken up, it will wake up the main chip. After the main chip is woken up, it will wake up the BMS system, and the BMS system will detect the thermal runaway of the power battery. Among them, after the target slave board acquisition chip wakes up the BMS system reversely, the BMS system detects the thermal runaway of the power battery. and notify the daisy-chain communication chip that the reverse wake-up of the target slave board acquisition chip is an invalid reverse wake-up. The daisy chain communication chip determines that the target slave board acquisition chip does not have the reverse wake-up permission. When the number of consecutive invalid reverse wake-up BMS systems of the target slave board acquisition chip is greater than the second preset threshold, the daisy chain communication chip determines that the target slave board acquisition The chip does not have reverse wake-up permission, where the first preset threshold can be but not limited to: 3 times, 5 times or 7 times, etc., and the second preset threshold can be but not limited to: 2 times, 3 times or 4 times and so on, the first preset threshold is greater than the second preset threshold.

It should be noted that, in the actual application process, when the target slave board acquisition chip cannot effectively collect the battery parameters corresponding to the power battery, the target slave board acquisition chip stops executing the solutions described in 101-103 above.

What needs to be explained is that after the pressure sensor chip wakes up the BMS system in reverse, the BMS system detects the thermal runaway of the power battery. To wake up, when the cumulative number of invalid reverse wake-up BMS of the pressure sensor chip is greater than the first preset threshold, or the number of continuous invalid reverse wake-up of the BMS system is greater than the second preset threshold, the BMS system notifies the pressure sensor chip to stop executing the above 101 -Scheme described in 103.

Further, as an implementation of the above method shown in FIG. 1 , another embodiment of the present application also provides a protection device for a power battery, which is applied to a target chip. This device embodiment corresponds to the foregoing method embodiment. For the convenience of reading, this device embodiment does not repeat the details in the foregoing method embodiment one by one, but it should be clear that the device in this embodiment can correspond to the foregoing method implementation. Everything in the example. This device is used to ensure that the BMS system detects the thermal runaway of the power battery in a timely manner, as shown in Figure 2. The device includes:

The collection unit 21 is used to collect battery parameters corresponding to the power battery when the BMS system is in a dormant state;

A determining unit 22, configured to determine whether the power battery is faulty according to the battery parameters corresponding to the power battery;

The wake-up unit 23 is configured to wake up the power chip when it is determined that the power battery fails, so that after the power chip is woken up, it wakes up the main chip, and the main chip wakes up the BMS system.

Further, as shown in FIG. 2, the target chip is specifically a target slave board acquisition chip, and the battery parameter corresponding to the power battery is the voltage value corresponding to each battery cell included in the power battery;

The determination unit 22 is specifically configured to: determine the maximum voltage value and the minimum voltage value corresponding to a plurality of the battery cells according to the voltage value corresponding to each of the battery cells;

judging whether the maximum voltage values corresponding to the multiple battery cells are greater than the maximum voltage threshold;

If so, it is determined that the power battery is faulty;

If not, judging whether the minimum voltage values corresponding to the plurality of battery cells are less than the minimum voltage threshold;

If so, it is determined that the power battery is faulty;

If not, it is determined that the power battery is not faulty.

Further, as shown in FIG. 2, the target chip is specifically a target slave board acquisition chip, and the battery parameter corresponding to the power battery is the temperature value corresponding to each battery cell included in the power battery;

The determining unit 22 is specifically configured to: determine the maximum temperature values corresponding to multiple battery cells according to the temperature value corresponding to each of the battery cells;

judging whether the maximum temperature values corresponding to the plurality of battery cells are greater than a maximum temperature threshold;

If so, it is determined that the power battery is faulty;

If not, it is determined that the power battery is not faulty.

Further, as shown in FIG. 2, the target chip is specifically a target slave board acquisition chip, and the battery parameters corresponding to the power battery are a plurality of on-board temperature values corresponding to the balance circuit board included in the power battery;

The determining unit 22 is specifically configured to: determine the maximum on-board temperature value corresponding to the equalizing circuit board according to the multiple on-board temperature values corresponding to the equalizing circuit board;

Judging whether the equalization circuit board is turned on before the BMS system enters the dormant state;

If it is turned on, it is judged whether the maximum onboard temperature value corresponding to the equalization circuit board is greater than the first onboard temperature threshold; if so, it is determined that the power battery is faulty; if not, it is judged that the power battery is not faulty;

If it is not turned on, it is judged whether the maximum on-board temperature value corresponding to the balancing circuit board is greater than the second on-board temperature threshold; if so, it is determined that the power battery is faulty; if not, it is judged that the power battery is not faulty .

Further, as shown in FIG. 2, the target chip is specifically a pressure sensor chip, and the battery parameter corresponding to the power battery is the current pressure value in the bag corresponding to the power battery;

The determination unit 22 is specifically configured to: determine the current pressure rise rate corresponding to the power battery according to the current pressure value in the bag corresponding to the power battery and the historical pressure value in the bag, wherein the historical bag pressure corresponding to the power battery The value is the pressure value in the package corresponding to the power battery obtained by the pressure sensor chip in the previous acquisition;

Determine whether the multiple pressure rise rates corresponding to the power battery within the target time period are all greater than a preset pressure rise rate threshold according to the current pressure rise rate and multiple historical pressure rise rates corresponding to the power battery, wherein the power battery The corresponding multiple historical pressure rise rates are the pressure rise rates corresponding to the power battery determined N times before by the pressure sensor chip;

If so, it is determined that the power battery is faulty;

If not, it is determined that the power battery is not faulty.

Further, as shown in FIG. 2, the target chip is specifically a pressure sensor chip, and the battery parameter corresponding to the power battery is the current pressure value in the bag corresponding to the power battery;

The determination unit 22 is specifically configured to: determine the current pressure increase value corresponding to the power battery according to the current pressure value in the package corresponding to the power battery and the reference pressure value in the package;

Determine whether the multiple pressure growth values corresponding to the power battery within the target time period are all greater than a preset pressure growth threshold according to the current pressure growth value corresponding to the power battery and a plurality of historical pressure growth values, wherein the power battery corresponds to The multiple historical pressure growth values of the pressure sensor chip are the pressure growth values corresponding to the power battery determined N times before;

If so, it is determined that the power battery is faulty;

If not, it is determined that the power battery is not faulty.

Further, as shown in FIG. 2, the wakeup unit 23 is specifically used to send a reverse wakeup flag to the daisy chain communication chip through the daisy chain to wake up the daisy chain communication chip, so that the daisy chain communication chip determines the target After the acquisition chip of the slave board has the reverse wake-up authority, it wakes up the power chip, the power chip wakes up the main chip, and the main chip wakes up the BMS system.

The embodiment of the present application provides a power battery protection method and device. The embodiment of the present application can collect the battery parameters corresponding to the power battery by the target chip when the BMS system is in a dormant state, and determine the power battery parameters according to the battery parameters corresponding to the power battery. Whether there is a fault; when the power battery is determined to be faulty according to the battery parameters corresponding to the power battery, the target chip reversely wakes up the power chip, after the power chip is woken up, wakes up the main chip, after the main chip is woken up, wakes up the BMS system, and the BMS system Thermal runaway detection of the power battery, so as to achieve the effect of reversely waking up the BMS system through the target chip when the power battery fails, and then realize the effect that the BMS system can detect the thermal runaway of the power battery in time when the power battery fails .

An embodiment of the present application provides a storage medium, the storage medium includes a stored program, wherein when the program is running, the device where the storage medium is located is controlled to execute the above-mentioned power battery protection method.

Storage media may include non-permanent memory in computer-readable media, in the form of random access memory (RAM) and/or nonvolatile memory, such as read-only memory (ROM) or flash memory (flash RAM), and the memory includes at least a memory chip.

The embodiment of the present application also provides a power battery protection device, the device includes a storage medium; and one or more processors, the storage medium is coupled with the processor, and the processor is configured to execute the The program instruction stored in the storage medium; the program instruction executes the above-mentioned power battery protection method when running.

An embodiment of the present application provides a device, which includes a processor, a memory, and a program stored on the memory and that can run on the processor. When the processor executes the program, the following steps are implemented:

When the BMS system is in a dormant state, collect battery parameters corresponding to the power battery;

Determine whether the power battery is faulty according to the battery parameters corresponding to the power battery;

If it is determined that the power battery fails, wake up the power chip, so that after the power chip is woken up, it wakes up the main chip, and the main chip wakes up the BMS system.

Further, the target chip is specifically the target slave board acquisition chip, and the battery parameter corresponding to the power battery is the voltage value corresponding to each battery cell contained in the power battery; parameters to determine if the traction battery is faulty, including:

determining the maximum voltage value and the minimum voltage value corresponding to a plurality of the battery cells according to the voltage value corresponding to each of the battery cells;

judging whether the maximum voltage values corresponding to the multiple battery cells are greater than the maximum voltage threshold;

If so, it is determined that the power battery is faulty;

If not, judging whether the minimum voltage values corresponding to the plurality of battery cells are less than the minimum voltage threshold;

If so, it is determined that the power battery is faulty;

If not, it is determined that the power battery is not faulty.

Further, the target chip is specifically the target slave board acquisition chip, and the battery parameter corresponding to the power battery is the temperature value corresponding to each battery cell contained in the power battery; parameters to determine if the traction battery is faulty, including:

determining the maximum temperature values corresponding to multiple battery cells according to the temperature values corresponding to each of the battery cells;

judging whether the maximum temperature values corresponding to the plurality of battery cells are greater than a maximum temperature threshold;

If so, it is determined that the power battery is faulty;

If not, it is determined that the power battery is not faulty.

Further, the target chip is specifically a target slave board acquisition chip, and the battery parameter corresponding to the power battery is a plurality of on-board temperature values corresponding to the balance circuit board included in the power battery; The battery parameters determine whether the traction battery is faulty, including:

determining a maximum on-board temperature value corresponding to the equalizing circuit board according to a plurality of on-board temperature values corresponding to the equalizing circuit board;

Judging whether the equalization circuit board is turned on before the BMS system enters the dormant state;

If it is turned on, it is judged whether the maximum onboard temperature value corresponding to the equalization circuit board is greater than the first onboard temperature threshold; if so, it is determined that the power battery is faulty; if not, it is judged that the power battery is not faulty;

If it is not turned on, it is judged whether the maximum on-board temperature value corresponding to the balancing circuit board is greater than the second on-board temperature threshold; if so, it is determined that the power battery is faulty; if not, it is judged that the power battery is not faulty .

Further, the target chip is specifically a pressure sensor chip, and the battery parameter corresponding to the power battery is the current pressure value in the bag corresponding to the power battery; the power battery is determined according to the battery parameter corresponding to the power battery Whether there is a failure, including:

Determine the current pressure rise rate corresponding to the power battery according to the current pressure value in the battery pack and the historical pressure value in the battery pack corresponding to the power battery, wherein the historical pressure value in the battery pack corresponding to the power battery is before the pressure sensor chip The pressure value in the bag corresponding to the power battery obtained in one collection;

Determine whether the multiple pressure rise rates corresponding to the power battery within the target time period are all greater than a preset pressure rise rate threshold according to the current pressure rise rate and multiple historical pressure rise rates corresponding to the power battery, wherein the power battery The corresponding multiple historical pressure rise rates are the pressure rise rates corresponding to the power battery determined N times before by the pressure sensor chip;

If so, it is determined that the power battery is faulty;

If not, it is determined that the power battery is not faulty.

Further, the target chip is specifically a pressure sensor chip, and the battery parameter corresponding to the power battery is the current pressure value in the bag corresponding to the power battery; the power battery is determined according to the battery parameter corresponding to the power battery Whether there is a failure, including:

Determine the current pressure increase value corresponding to the power battery according to the current pressure value in the bag corresponding to the power battery and the reference pressure value in the bag;

Determine whether the multiple pressure growth values corresponding to the power battery within the target time period are all greater than a preset pressure growth threshold according to the current pressure growth value corresponding to the power battery and a plurality of historical pressure growth values, wherein the power battery corresponds to The multiple historical pressure growth values of the pressure sensor chip are the pressure growth values corresponding to the power battery determined N times before;

If so, it is determined that the power battery is faulty;

If not, it is determined that the power battery is not faulty.

Further, the wake-up power chip includes:

Send the reverse wake-up flag bit to the daisy chain communication chip through the daisy chain to wake up the daisy chain communication chip, so that the daisy chain communication chip wakes up the power supply chip after determining that the target slave board acquisition chip has reverse wakeup authority, by The power chip wakes up the main chip, and the main chip wakes up the BMS system.

The present application also provides a computer program product, which, when executed on a data processing device, is suitable for executing a program code that is initialized with the following method steps: when the BMS system is in a dormant state, collect the battery parameters corresponding to the power battery; according to the The battery parameters corresponding to the power battery determine whether the power battery is faulty; if it is determined that the power battery is faulty, then wake up the power chip, so that after the power chip is woken up, it wakes up the main chip, and the main chip wakes up the main chip Describe the BMS system.

Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems, or computer program products. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The present application is described with reference to flowcharts and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

Memory may include non-permanent storage in computer readable media, in the form of random access memory (RAM) and/or nonvolatile memory such as read only memory (ROM) or flash RAM. The memory is an example of a computer readable medium.

Computer-readable media, including both permanent and non-permanent, removable and non-removable media, can be implemented by any method or technology for storage of information. Information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read only memory (ROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Flash memory or other memory technology, Compact Disc Read-Only Memory (CD-ROM), Digital Versatile Disc (DVD) or other optical storage, Magnetic tape cartridge, tape magnetic disk storage or other magnetic storage device or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media excludes transitory computer-readable media, such as modulated data signals and carrier waves.

It should also be noted that the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes Other elements not expressly listed, or elements inherent in the process, method, commodity, or apparatus are also included. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

Those skilled in the art should understand that the embodiments of the present application may be provided as methods, systems or computer program products. Accordingly, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

The above are only examples of the present application, and are not intended to limit the present application. For those skilled in the art, various modifications and changes may occur in this application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the scope of the claims of the present application.

Claims (16)

1. A method for protecting a power battery, the method being applied to a target chip, the method comprising:

when the BMS system is in a dormant state, battery parameters corresponding to the power battery are collected;

determining whether the power battery fails according to battery parameters corresponding to the power battery;

And if the power battery is determined to be faulty, waking up the power chip, so that after the power chip is woken up, waking up the main chip, and waking up the BMS system by the main chip.

2. The method according to claim 1, wherein the target chip is specifically a target slave board acquisition chip, and the battery parameter corresponding to the power battery is a voltage value corresponding to each battery cell included in the power battery; the determining whether the power battery fails according to the battery parameters corresponding to the power battery comprises the following steps:

determining maximum voltage values and minimum voltage values corresponding to a plurality of battery cells according to the voltage values corresponding to each battery cell;

judging whether the maximum voltage values corresponding to the battery cells are larger than a maximum voltage threshold value or not;

if yes, judging that the power battery fails;

if not, judging whether the minimum voltage values corresponding to the battery cells are smaller than a minimum voltage threshold value or not;

if yes, judging that the power battery fails;

if not, judging that the power battery has no fault.

3. The method according to claim 1, wherein the target chip is specifically a target slave board acquisition chip, and the battery parameter corresponding to the power battery is a temperature value corresponding to each battery cell contained in the power battery; the determining whether the power battery fails according to the battery parameters corresponding to the power battery comprises the following steps:

Determining maximum temperature values corresponding to a plurality of battery cells according to the temperature values corresponding to each battery cell;

judging whether the maximum temperature values corresponding to the battery monomers are larger than a maximum temperature threshold value or not;

if yes, judging that the power battery fails;

if not, judging that the power battery has no fault.

4. The method of claim 1, wherein the target chip is specifically a target slave board acquisition chip, and the battery parameter corresponding to the power battery is a plurality of on-board temperature values corresponding to an equalization circuit board included in the power battery; the determining whether the power battery fails according to the battery parameters corresponding to the power battery comprises the following steps:

determining a maximum on-board temperature value corresponding to the equalization circuit board according to a plurality of on-board temperature values corresponding to the equalization circuit board;

judging whether the equalization circuit board is started before the BMS system enters a dormant state;

if yes, judging whether the maximum on-board temperature value corresponding to the equalization circuit board is larger than a first on-board temperature threshold value; if yes, judging that the power battery fails; if not, judging that the power battery has no fault;

If not, judging whether the maximum on-board temperature value corresponding to the equalization circuit board is greater than a second on-board temperature threshold value; if yes, judging that the power battery fails; if not, judging that the power battery has no fault.

5. The method according to claim 1, wherein the target chip is specifically a pressure sensor chip, and the battery parameter corresponding to the power battery is a current intra-package pressure value corresponding to the power battery; the determining whether the power battery fails according to the battery parameters corresponding to the power battery comprises the following steps:

determining the current pressure rising rate corresponding to the power battery according to the current pressure value in the package and the historical pressure value in the package corresponding to the power battery, wherein the historical pressure value in the package corresponding to the power battery is the pressure value in the package corresponding to the power battery acquired by the pressure sensor chip for the previous time;

determining whether a plurality of pressure rising rates corresponding to the power battery in a target time period are all larger than a preset pressure rising rate threshold according to the current pressure rising rate and the plurality of historical pressure rising rates corresponding to the power battery, wherein the plurality of historical pressure rising rates corresponding to the power battery are the pressure rising rates corresponding to the power battery determined for the previous N times by the pressure sensor chip;

If yes, judging that the power battery fails;

if not, judging that the power battery has no fault.

6. The method according to claim 1, wherein the target chip is specifically a pressure sensor chip, and the battery parameter corresponding to the power battery is a current intra-package pressure value corresponding to the power battery; the determining whether the power battery fails according to the battery parameters corresponding to the power battery comprises the following steps:

determining a current pressure increase value corresponding to the power battery according to the current pressure value corresponding to the power battery and the reference pressure value;

determining whether a plurality of pressure increment values corresponding to the power battery in a target time period are all larger than a preset pressure increment threshold according to a current pressure increment value and a plurality of historical pressure increment values corresponding to the power battery, wherein the plurality of historical pressure increment values corresponding to the power battery are the pressure increment values corresponding to the power battery determined for the previous N times by the pressure sensor chip;

if yes, judging that the power battery fails;

if not, judging that the power battery has no fault.

7. The method of any of claims 2-4, wherein the waking up the power chip comprises:

And sending a reverse wake-up flag bit to the daisy-chain communication chip through the daisy-chain so as to wake up the daisy-chain communication chip, so that the daisy-chain communication chip wakes up the power chip after judging that the target slave board acquisition chip has reverse wake-up authority, the power chip wakes up the main chip, and the main chip wakes up the BMS system.

8. A power cell protection device, wherein the device is applied to a target chip, the device comprising:

the acquisition unit is used for acquiring battery parameters corresponding to the power battery when the BMS system is in a dormant state;

the determining unit is used for determining whether the power battery fails according to the battery parameters corresponding to the power battery;

and the wake-up unit is used for waking up the power chip when the power battery is determined to be faulty, so that the main chip is waken up after the power chip is waken up, and the BMS system is waken up by the main chip.

9. The device according to claim 8, wherein the target chip is specifically a target slave board acquisition chip, and the battery parameter corresponding to the power battery is a voltage value corresponding to each battery cell contained in the power battery;

The determining unit is specifically configured to: determining maximum voltage values and minimum voltage values corresponding to a plurality of battery cells according to the voltage values corresponding to each battery cell;

judging whether the maximum voltage values corresponding to the battery cells are larger than a maximum voltage threshold value or not;

if yes, judging that the power battery fails;

if not, judging whether the minimum voltage values corresponding to the battery cells are smaller than a minimum voltage threshold value or not;

if yes, judging that the power battery fails;

if not, judging that the power battery has no fault.

10. The device according to claim 8, wherein the target chip is specifically a target slave board acquisition chip, and the battery parameter corresponding to the power battery is a temperature value corresponding to each battery cell contained in the power battery;

the determining unit is specifically configured to: determining maximum temperature values corresponding to a plurality of battery cells according to the temperature values corresponding to each battery cell;

judging whether the maximum temperature values corresponding to the battery monomers are larger than a maximum temperature threshold value or not;

if yes, judging that the power battery fails;

if not, judging that the power battery has no fault.

11. The device of claim 8, wherein the target chip is specifically a target slave board acquisition chip, and the battery parameter corresponding to the power battery is a plurality of on-board temperature values corresponding to an equalization circuit board included in the power battery;

the determining unit is specifically configured to: determining a maximum on-board temperature value corresponding to the equalization circuit board according to a plurality of on-board temperature values corresponding to the equalization circuit board;

judging whether the equalization circuit board is started before the BMS system enters a dormant state;

if yes, judging whether the maximum on-board temperature value corresponding to the equalization circuit board is larger than a first on-board temperature threshold value; if yes, judging that the power battery fails; if not, judging that the power battery has no fault;

if not, judging whether the maximum on-board temperature value corresponding to the equalization circuit board is greater than a second on-board temperature threshold value; if yes, judging that the power battery fails; if not, judging that the power battery has no fault.

12. The device according to claim 8, wherein the target chip is specifically a pressure sensor chip, and the battery parameter corresponding to the power battery is a current intra-package pressure value corresponding to the power battery;

The determining unit is specifically configured to: determining the current pressure rising rate corresponding to the power battery according to the current pressure value in the package and the historical pressure value in the package corresponding to the power battery, wherein the historical pressure value in the package corresponding to the power battery is the pressure value in the package corresponding to the power battery acquired by the pressure sensor chip for the previous time;

determining whether a plurality of pressure rising rates corresponding to the power battery in a target time period are all larger than a preset pressure rising rate threshold according to the current pressure rising rate and the plurality of historical pressure rising rates corresponding to the power battery, wherein the plurality of historical pressure rising rates corresponding to the power battery are the pressure rising rates corresponding to the power battery determined for the previous N times by the pressure sensor chip;

if yes, judging that the power battery fails;

if not, judging that the power battery has no fault.

13. The device according to claim 8, wherein the target chip is specifically a pressure sensor chip, and the battery parameter corresponding to the power battery is a current intra-package pressure value corresponding to the power battery;

the determining unit is specifically configured to: determining a current pressure increase value corresponding to the power battery according to the current pressure value corresponding to the power battery and the reference pressure value;

Determining whether a plurality of pressure increment values corresponding to the power battery in a target time period are all larger than a preset pressure increment threshold according to a current pressure increment value and a plurality of historical pressure increment values corresponding to the power battery, wherein the plurality of historical pressure increment values corresponding to the power battery are the pressure increment values corresponding to the power battery determined for the previous N times by the pressure sensor chip;

if yes, judging that the power battery fails;

if not, judging that the power battery has no fault.

14. The device according to claim 9-11, wherein,

the wake-up unit is specifically configured to send a reverse wake-up flag bit to the daisy-chain communication chip through the daisy-chain, so that the daisy-chain communication chip wakes up the power chip after determining that the target slave board acquisition chip has a reverse wake-up authority, the power chip wakes up the main chip, and the main chip wakes up the BMS system.

15. A storage medium comprising a stored program, wherein the program, when run, controls a device in which the storage medium is located to perform the method of protecting a power cell according to any one of claims 1-7.

16. A protection device for a power battery, the device comprising a storage medium; and one or more processors coupled to the storage medium, the processors configured to execute the program instructions stored in the storage medium; the program instructions, when executed, perform the method of protecting a power cell of any one of claims 1-7.

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