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

Protection method and device for power battery Download PDF

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Publication number
CN116093472A
CN116093472A CN202211619655.8A CN202211619655A CN116093472A CN 116093472 A CN116093472 A CN 116093472A CN 202211619655 A CN202211619655 A CN 202211619655A CN 116093472 A CN116093472 A CN 116093472A
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power battery
battery
chip
judging
power
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CN116093472B (en
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陈睿
肖江
熊传磊
马建生
张洪雷
张磊
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Hozon New Energy Automobile Co Ltd
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Hozon New Energy Automobile Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
    • G01R31/385—Arrangements for measuring battery or accumulator variables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

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 disclosure relates to the field of power battery technologies, and in particular, to a method and an apparatus for protecting a power battery.
Background
In order to ensure the use safety of the power battery, the highest level of battery performance detection needs to be performed on the power battery, for example, thermal runaway detection is performed on the power battery.
After the electric automobile is parked or extinguished, the battery management system (Battery Management System, BMS) enters a dormant state, a main chip in the BMS is automatically awakened periodically in the dormant state of the BMS, the whole BMS is awakened, and then the BMS detects thermal runaway of the power battery; because the main chip is automatically awakened periodically, when the power battery fails, the BMS system may not be able to timely detect thermal runaway of the power battery.
Disclosure of Invention
The embodiment of the application provides a protection method and device for a power battery, and mainly aims to ensure that a BMS system timely detects thermal runaway of the power battery.
In order to solve the technical problems, the embodiment of the application provides the following technical scheme:
in a first aspect, the present application provides a method for protecting a power battery, where the method is applied to a target chip, and the method includes:
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.
Optionally, 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 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.
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 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.
Optionally, 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 an equalization circuit board 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 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.
Optionally, the target chip is specifically a pressure sensor chip, and the battery parameter corresponding to the power battery is a current pressure value in the package 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.
Optionally, the target chip is specifically a pressure sensor chip, and the battery parameter corresponding to the power battery is a current pressure value in the package 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.
Optionally, the wake-up power chip includes:
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.
In a second aspect, the present application further provides a protection device for a power battery, the device being applied to a target chip, the device including:
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.
Optionally, 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.
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 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.
Optionally, 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 an equalization circuit board contained 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.
Optionally, the target chip is specifically a pressure sensor chip, and the battery parameter corresponding to the power battery is a current pressure value in the package 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.
Optionally, the target chip is specifically a pressure sensor chip, and the battery parameter corresponding to the power battery is a current pressure value in the package 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.
Optionally, the wake-up unit is specifically configured to send a reverse wake-up flag bit to the daisy-chained communication chip through the daisy-chained communication chip, so that the daisy-chained 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 master chip, and the master chip wakes up the BMS system.
In a third aspect, an embodiment of the present application provides a storage medium, where the storage medium includes a stored program, where the program, when executed, controls a device where the storage medium is located to execute the method for protecting a power battery according to the first aspect.
In a fourth aspect, embodiments of the present application provide 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 execute the method for protecting a power battery according to the first aspect when running.
By means of the technical scheme, the technical scheme provided by the application has the following advantages:
the application provides a protection method and a protection device for a power battery, wherein when a BMS system is in a dormant state, battery parameters corresponding to the power battery can be collected by a target chip, and whether the power battery fails or not is determined according to the battery parameters corresponding to the power battery; when determining that power battery breaks down according to the battery parameter that power battery corresponds, the reverse power chip that wakes up of target chip, power chip wake up the back, wake up the main chip, and the back is woken up to the main chip, wake up BMS system, carry out thermal runaway detection to power battery by BMS system to realize when power battery breaks down, through the reverse effect of waking up BMS system of target chip, and then realize when power battery breaks down, BMS system can in time carry out thermal runaway detection's effect to power battery.
The foregoing description is only an overview of the technical solutions of the present application, and may be implemented according to the content of the specification in order to make the technical means of the present application more clearly understood, and in order to make the above-mentioned and other objects, features and advantages of the present application more clearly understood, the following detailed description of the present application will be given.
Drawings
The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present application will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. Several embodiments of the present application are illustrated by way of example and not by way of limitation in the figures of the accompanying drawings, in which like reference numerals refer to similar or corresponding parts and in which:
FIG. 1 shows a flow chart of a crop yield estimation method provided in an embodiment of the present application;
fig. 2 shows a block diagram of a crop yield estimation apparatus according to an embodiment of the present application.
Detailed Description
Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While 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 so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is noted that unless otherwise indicated, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs.
The embodiment of the application provides a protection method of a power battery, which is applied to a target chip, and particularly shown in fig. 1, and comprises the following steps:
101. when the BMS system is in a dormant state, battery parameters corresponding to the power battery are collected.
In this embodiment of the present application, the execution body in each step is a target chip in an electric vehicle, where the electric vehicle has a plurality of slave board collecting chips and one pressure sensor chip, the target chip may be any one of the plurality of slave board collecting chips (i.e., the target slave board collecting chip), and the target chip may also be the pressure sensor chip.
When the target chip is specifically a target slave board acquisition chip, the battery parameters corresponding to the acquired power battery may be, but are not limited to: any one or more of a voltage value corresponding to each battery cell contained in the power battery, a temperature value corresponding to each battery cell contained in the power battery, a plurality of on-board temperature values corresponding to an equalization circuit board contained in the power battery and the like; when the target chip is specifically a pressure sensor chip, the battery parameters corresponding to the collected power battery may be, but are not limited to,: the current pressure value in the bag corresponding to the power battery.
In the embodiment of the application, after the electric automobile is parked or flameout, the BMS system enters a dormant state; when the BMS system is in a dormant state, the target chip can collect battery parameters corresponding to the power battery.
102. And determining whether the power battery fails according to the battery parameters corresponding to the power battery.
In the embodiment of the application, after the battery parameters corresponding to the power battery are acquired, the target chip can determine whether the power battery fails according to the battery parameters corresponding to the power battery.
103. If the power battery is determined to be faulty, the power chip is awakened, so that after the power chip is awakened, the main chip is awakened, and the BMS system is awakened by the main chip.
In this application embodiment, when determining power battery to break down according to the battery parameter that power battery corresponds, the target chip alright reverse wake-up power chip, after the power chip was awakened, just can wake-up main chip, and main chip is awakened the back, just can wake-up BMS system, carry out thermal runaway detection to power battery by BMS system to realize when power battery breaks down, through the reverse effect of waking-up BMS system of target chip, and then realize when power battery breaks down, BMS system can in time carry out thermal runaway detection's effect to power battery.
The embodiment of the application provides a protection method for a power battery, which can acquire battery parameters corresponding to the power battery by a target chip when a BMS system is in a dormant state, and determine whether the power battery fails according to the battery parameters corresponding to the power battery; when determining that power battery breaks down according to the battery parameter that power battery corresponds, the reverse power chip that wakes up of target chip, power chip wake up the back, wake up the main chip, and the back is woken up to the main chip, wake up BMS system, carry out thermal runaway detection to power battery by BMS system to realize when power battery breaks down, through the reverse effect of waking up BMS system of target chip, and then realize when power battery breaks down, BMS system can in time carry out thermal runaway detection's effect to power battery.
Further, in the embodiment of the present application, when the target chip is specifically a target slave board collecting chip, and the collected battery parameters are specifically voltage values corresponding to each battery monomer included in the power battery, a specific process of determining, by the target chip, whether the power battery fails according to the battery parameters corresponding to the power battery is as follows: firstly, determining a maximum voltage value and a minimum voltage value corresponding to a plurality of battery cells according to the voltage value corresponding to each battery cell, namely determining the voltage value with the largest value among the plurality of voltage values as the maximum voltage value corresponding to the plurality of battery cells, and determining the voltage value with the smallest value among the plurality of voltage values as the minimum voltage value corresponding to the plurality of battery cells; secondly, judging whether maximum voltage values corresponding to the plurality of 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 value corresponding to the plurality of battery monomers is smaller than a minimum voltage threshold value; if yes, judging that the power battery fails; if not, judging that the power battery has no fault.
Wherein the target slave board acquisition chip can determine the maximum voltage threshold in any one of the following two ways:
(1) Before the BMS system is in a dormant state, a target slave board acquisition chip acquires voltage values corresponding to each battery cell, determines maximum voltage values corresponding to a plurality of battery cells, substitutes the maximum voltage values corresponding to the battery cells into a first preset formula to obtain a preselected maximum voltage threshold value, can obtain the preselected maximum voltage threshold values according to the method, and determines the preselected maximum voltage threshold value with the largest value in the preselected maximum voltage threshold values as the maximum voltage threshold value; the first preset formula is specifically as follows:
Max_V＝{4300mv(PackMax_V＜4250mv)，
PackMax_V+50mv(PackMax_V＞4250mv)}
wherein max_v is a preselected maximum voltage threshold, and packmax_v is a maximum voltage value corresponding to the plurality of battery cells.
(2) Before the BMS system is in a dormant state, a target slave board acquisition chip acquires a voltage value corresponding to each battery cell, determines maximum voltage values corresponding to a plurality of battery cells, receives the maximum voltage values corresponding to a plurality of battery cells determined by each other slave board acquisition chip, determines a target maximum voltage value corresponding to the plurality of battery cells according to the maximum voltage values corresponding to the plurality of battery cells determined by the target slave board acquisition chip and the maximum voltage values corresponding to the plurality of battery cells determined by the target slave board acquisition chip, substitutes the maximum voltage values corresponding to the battery cells determined by the target slave board acquisition chip and the target maximum voltage values corresponding to the battery cells into a second preset formula to obtain a preselected maximum voltage threshold, and can obtain a plurality of preselected maximum voltage thresholds according to the method, and determines the preselected maximum voltage threshold with the largest value in the preselected maximum voltage thresholds as the maximum voltage threshold; the target maximum voltage value corresponding to the plurality of battery cells is the maximum voltage value corresponding to the plurality of battery cells determined by the target slave board acquisition chip and the maximum voltage value with the largest value among the maximum voltage values corresponding to the plurality of battery cells determined by each other slave board acquisition chip; before the BMS system is in a dormant state, each other slave board acquisition chip also acquires a voltage value corresponding to each battery cell and determines a maximum voltage value corresponding to a plurality of battery cells; the second preset formula is specifically as follows:
Max_V＝Min(ChipMax_V+500mv，PackMax_V+100mv)
Wherein, max_v is a preselected maximum voltage threshold, chipmax_v is a target maximum voltage value corresponding to a plurality of battery cells, and packmax_v is a maximum voltage value corresponding to a plurality of battery cells determined by a target slave board acquisition chip.
The target slave board acquisition chip can determine the minimum voltage threshold in any one of the following two modes:
(1) Before the BMS system is in a dormant state, a target slave board acquisition chip acquires a voltage value corresponding to each battery cell, determines minimum voltage values corresponding to a plurality of battery cells, substitutes the minimum voltage values corresponding to the battery cells into a third preset formula to obtain a preselected minimum voltage threshold value, can obtain a plurality of preselected minimum voltage threshold values according to the method, and determines the preselected minimum voltage threshold value with the smallest value in the preselected minimum voltage threshold values as the minimum voltage threshold value; the third preset formula is specifically as follows:
Min_V=Min (PackMin_V-500 mv, two-level under-voltage alarm voltage value)
Wherein min_v is a preselected minimum voltage threshold, and packmin_v is a minimum voltage value corresponding to a plurality of battery cells, and the secondary under-voltage alarm voltage value may be, but is not limited to,: 2.5V, 2.6V, 2.7V, etc.
(2) Before the BMS system is in a dormant state, the target slave board acquisition chip acquires the voltage value corresponding to each battery cell, determines the minimum voltage value corresponding to a plurality of battery cells, receives the minimum voltage value corresponding to a plurality of battery cells determined by each other slave board acquisition chip,
according to the minimum voltage values corresponding to the battery cells determined by the battery module and the minimum voltage values corresponding to the battery cells determined by the battery module from the board acquisition chip, determining target minimum voltage values corresponding to the battery cells, substituting the target minimum voltage values corresponding to the battery cells into a fourth preset formula to obtain a preselected minimum voltage threshold value, obtaining a plurality of preselected minimum voltage threshold values according to the method, and determining the preselected minimum voltage threshold value with the minimum value in the preselected minimum voltage threshold values as the minimum voltage threshold value; the target minimum voltage value corresponding to the plurality of battery cells is the minimum voltage value which is determined by the target slave board acquisition chip and is the minimum voltage value with the minimum value among the minimum voltage values corresponding to the plurality of battery cells determined by the other slave board acquisition chips; before the BMS system is in a dormant state, each other slave board acquisition chip also acquires a voltage value corresponding to each battery cell and determines a minimum voltage value corresponding to a plurality of battery cells; 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 a plurality of battery cells.
Further, in the embodiment of the present application, when the target chip is specifically a target slave board collecting chip, and the collected battery parameters are specifically temperature values corresponding to each battery monomer included in the power battery, a specific process of determining, by the target chip, whether the power battery fails according to the battery parameters corresponding to the power battery is as follows: firstly, determining the maximum temperature value corresponding to a plurality of battery cells according to the temperature value corresponding to each battery cell, namely determining the temperature value with the maximum value in the plurality of temperature values as the maximum temperature value corresponding to the plurality of battery cells; secondly, judging whether the maximum temperature value corresponding to the plurality of battery monomers is 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.
The target slave board acquisition chip can determine the maximum temperature threshold in any one of the following two modes:
(1) Before the BMS system is in a dormant state, a target slave board acquisition chip acquires a temperature value corresponding to each battery cell, determines maximum temperature values corresponding to a plurality of battery cells, substitutes the maximum temperature values corresponding to the battery cells into a fifth preset formula to obtain a preselected maximum temperature threshold, can obtain a plurality of preselected maximum temperature thresholds according to the method, and determines the preselected maximum temperature threshold with the largest value in the preselected maximum temperature thresholds as the maximum temperature threshold; the fifth preset formula is specifically as follows:
Max_T＝{48℃(PackMax_T＜46℃)，
PackMax_T+5℃(PackMax_T≥46℃)}
Wherein, max_t is a preselected maximum temperature threshold, and packmax_t is a maximum temperature value corresponding to a plurality of battery cells.
(2) Before the BMS system is in a dormant state, a target slave plate acquisition chip acquires a temperature value corresponding to each battery cell, determines a maximum temperature value corresponding to a plurality of battery cells, receives the maximum temperature value corresponding to a plurality of battery cells determined by each other slave plate acquisition chip, determines a target maximum temperature value corresponding to a plurality of battery cells according to the maximum temperature value corresponding to the battery cells determined by the target slave plate acquisition chip and the maximum temperature value corresponding to the battery cells determined by the target slave plate acquisition chip, substitutes the maximum temperature value corresponding to the battery cells determined by the target slave plate acquisition chip and the target maximum temperature value corresponding to the battery cells into a sixth preset formula to obtain a preselected maximum temperature threshold, can obtain a plurality of preselected maximum temperature thresholds according to the method, and determines the preselected maximum temperature threshold with the largest value in the preselected maximum temperature thresholds as the maximum temperature threshold; the target maximum temperature value corresponding to the plurality of battery cells is the maximum temperature value which is determined by the target slave board acquisition chip and is the maximum temperature value with the maximum value among the maximum temperature values corresponding to the plurality of battery cells determined by the other slave board acquisition chips; before the BMS system is in a dormant state, each other slave board acquisition chip also acquires a temperature value corresponding to each battery cell and determines a maximum temperature value corresponding to a plurality of battery cells; the sixth preset formula is specifically 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 a plurality of battery cells.
Further, in the embodiment of the present application, when the target chip is specifically a target slave board acquisition chip, and the acquired battery parameters are specifically a plurality of on-board temperature values corresponding to an equalization circuit board included in the power battery, a specific process of determining, by the target chip, whether the power battery fails according to the battery parameters corresponding to the power battery is as follows: firstly, determining a maximum on-board temperature value corresponding to an equalization circuit board according to a plurality of on-board temperature values corresponding to the equalization circuit board, namely determining the on-board temperature value with the maximum value in the plurality of on-board temperature values as the maximum on-board temperature value corresponding to the equalization circuit board, wherein the equalization circuit board is provided with a plurality of temperature acquisition points, and the on-board temperature value corresponding to the equalization circuit board is the on-board temperature value at the plurality of temperature acquisition points; secondly, 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.
The second on-board temperature threshold is a preset value, which may be, but not limited to: 105 ℃, 110 ℃ or 120 ℃ and the like; the specific mode of determining the first onboard temperature threshold by the target slave board acquisition chip is as follows: before the BMS system is in a dormant state, a target slave board acquisition chip acquires a plurality of on-board temperature values corresponding to the equalization circuit board, determines a maximum on-board temperature value corresponding to the equalization circuit board, substitutes the maximum on-board temperature value corresponding to the equalization circuit board into a seventh preset formula to obtain a preselected on-board temperature threshold value, can obtain a plurality of preselected on-board temperature threshold values according to the method, and determines the preselected on-board temperature threshold value with the largest value in the preselected on-board temperature threshold values as a first on-board temperature threshold value; the seventh preset formula is specifically as follows:
Max_NT＝A+10℃
wherein, max_NT is a preselected on-board temperature threshold, A is a maximum on-board temperature value corresponding to the equalization circuit board.
Further, in the embodiment of the present application, when the target chip is specifically a pressure sensor chip, and the acquired battery parameter is specifically a current pressure value in the package corresponding to the power battery, a specific process of determining, by the target chip, whether the power battery fails according to the battery parameter corresponding to the power battery is: firstly, determining the current pressure rising rate corresponding to the power battery according to the current pressure value in the package corresponding to the power battery 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 last time; secondly, determining whether a plurality of pressure rising rates corresponding to the power battery in a target time period are all greater 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 preset pressure rising rate threshold can be, but is not limited to: 2KPa/s, 3KPa/s, 4KPa/s, etc., the target time period may be, but not limited to: the method comprises the steps that the current time is 2S before the current time, 3S before the current time or 4S before the current time, the current time is the time for determining the current pressure rising rate, a plurality of historical pressure rising rates corresponding to the power battery are the pressure rising rates corresponding to the power battery determined N times before the pressure sensor chip, and N is a positive integer; if yes, judging that the power battery fails; if not, judging that the power battery has no fault.
Further, in the embodiment of the present application, when the target chip is specifically a pressure sensor chip, and the acquired battery parameter is specifically a current pressure value in the package corresponding to the power battery, a specific process of determining, by the target chip, whether the power battery fails according to the battery parameter corresponding to the power battery is: firstly, determining a current pressure increase value corresponding to the power battery according to a current pressure value corresponding to the power battery and a reference pressure value, namely calculating a difference value between the current pressure value corresponding to the power battery and the reference pressure value, and determining the difference value as the current pressure increase value corresponding to the power battery; secondly, 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 value according to the current pressure increment value and the 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 last 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.
Further, in the embodiment of the present application, when the target chip is specifically a target slave board acquisition chip, a specific process of waking up the power supply chip by the target chip is: the daisy chain communication chip is used for sending a reverse awakening flag bit to the daisy chain communication chip, so that the daisy chain communication chip is awakened, the target slave board collecting chip can be judged whether to have the right of reversely awakening the BMS system, when the daisy chain communication chip judges that the target slave board collecting chip has the reverse awakening right, the daisy chain communication chip can awaken the power chip, the power chip can awaken the main chip after being awakened, the BMS system can be awakened after the main chip is awakened, and the BMS system is used for detecting thermal runaway of the power battery. After the target slave board collecting chip wakes up the BMS system reversely, the BMS system carries out thermal runaway detection on the power battery, when the BMS system determines that the power battery does not have thermal runaway, the target slave board collecting chip wakes up to be invalid backward wakening, the target slave board collecting chip is informed of the daisy chain communication chip that the target slave board collecting chip wakes up reversely to be invalid backward wakening, when the number of times of accumulating invalid backward wakening the BMS system before the target slave board collecting chip is larger than a first preset threshold value, the daisy chain communication chip determines that the target slave board collecting chip does not have backward wakening permission, and when the number of times of continuously invalid backward wakening the BMS system before the target slave board collecting chip is larger than a second preset threshold value, the daisy chain communication chip determines that the target slave board collecting chip does not have backward wakening permission, wherein the first preset threshold value can be but is not limited to: 3 times, 5 times, 7 times, etc., the second preset threshold may be, but is not limited to: 2 times, 3 times, 4 times, etc., 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 acquire the battery parameters corresponding to the power battery, the target slave board acquisition chip stops executing the schemes 101-103.
It should be noted that, after the pressure sensor chip wakes up the BMS system in the reverse direction, the BMS system performs thermal runaway detection on the power battery, when the BMS system determines that the power battery is not out of thermal runaway, it determines that the pressure sensor chip wakes up in the reverse direction this time to wake up in the invalid direction, and when the number of times of accumulated invalid reverse wake-up BMS of the pressure sensor chip is greater than a first preset threshold value, or the number of times of continuous invalid reverse wake-up BMS system is greater than a second preset threshold value, the BMS system notifies the pressure sensor chip to stop executing the scheme described in 101-103.
Further, as an implementation of the method shown in fig. 1, another embodiment of the present application further provides a protection device for a power battery, where the device is applied to a target chip. The embodiment of the device corresponds to the embodiment of the method, and for convenience of reading, details of the embodiment of the method are not repeated one by one, but it should be clear that the device in the embodiment can correspondingly realize all the details of the embodiment of the method. The device is applied to guarantee that BMS system carries out thermal runaway detection to power battery in time, specifically as shown in FIG. 2, and the device includes:
An acquisition unit 21, configured to acquire battery parameters corresponding to the power battery when the BMS system is in a sleep state;
a determining unit 22, configured to determine whether the power battery has a fault according to a battery parameter corresponding to the power battery;
and a wake-up unit 23, configured to wake up a power chip when it is determined that the power battery fails, so that after the power chip is woken up, wake up a main chip, and wake up the BMS system by the main chip.
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 a voltage value corresponding to each battery cell included in the power battery;
the determining unit 22 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.
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 a temperature value corresponding to each battery cell included in the power battery;
the determining unit 22 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.
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 an equalization circuit board included in the power battery;
the determining unit 22 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.
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 package corresponding to the power battery;
the determining unit 22 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.
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 package corresponding to the power battery;
the determining unit 22 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.
Further, as shown in fig. 2, the wake-up unit 23 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, and the power chip wakes up the master chip and wakes up the BMS system by the master chip.
The embodiment of the application provides a protection method and a protection device for a power battery, wherein when a BMS system is in a dormant state, battery parameters corresponding to the power battery can be collected by a target chip, and whether the power battery fails or not is determined according to the battery parameters corresponding to the power battery; when determining that power battery breaks down according to the battery parameter that power battery corresponds, the reverse power chip that wakes up of target chip, power chip wake up the back, wake up the main chip, and the back is woken up to the main chip, wake up BMS system, carry out thermal runaway detection to power battery by BMS system to realize when power battery breaks down, through the reverse effect of waking up BMS system of target chip, and then realize when power battery breaks down, BMS system can in time carry out thermal runaway detection's effect to power battery.
The embodiment of the application provides a storage medium, which comprises a stored program, wherein the program is used for controlling equipment where the storage medium is located to execute the protection method of the power battery when running.
The storage medium may include volatile memory, random Access Memory (RAM) and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM), among other forms in computer readable media, the memory including at least one memory chip.
The embodiment of the application also provides a protection device of the power battery, which comprises 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; and executing the protection method of the power battery when the program instructions run.
The embodiment of the application provides equipment, which comprises a processor, a memory and a program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize 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.
Further, 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 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.
Further, 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.
Further, 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 an equalization circuit board 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 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.
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 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.
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 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.
Further, the wake-up power chip includes:
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.
The present application also provides a computer program product adapted to perform, when executed on a data processing device, a program code initialized with the method steps of: 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.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. 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, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer 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 Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. 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, and the like) having computer-usable program code embodied therein.
The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and changes may be made to the present application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc. which are within the spirit and principles of the present application are intended to 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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Denomination of invention: Protection methods and devices for power batteries

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