CN113960474B - Method and system for collecting voltage extremum of power battery pack and electric automobile - Google Patents
Method and system for collecting voltage extremum of power battery pack and electric automobile Download PDFInfo
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- CN113960474B CN113960474B CN202010638672.0A CN202010638672A CN113960474B CN 113960474 B CN113960474 B CN 113960474B CN 202010638672 A CN202010638672 A CN 202010638672A CN 113960474 B CN113960474 B CN 113960474B
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000005070 sampling Methods 0.000 claims description 19
- 230000001960 triggered effect Effects 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000005195 poor health Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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Classifications
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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]
- G01R31/3644—Constructional arrangements
- G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
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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
- G01R31/005—Testing of electric installations on transport means
- G01R31/006—Testing of electric installations on transport means on road vehicles, e.g. automobiles or trucks
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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
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
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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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a method and a system for collecting a voltage extremum of a power battery pack and an electric automobile, wherein the method comprises the following steps: receiving a voltage extremum acquisition command; collecting the maximum voltage value and the minimum voltage value of a target battery cell, and sending the maximum voltage value and the minimum voltage value to a battery management system main board, wherein the target battery cell is the battery cell corresponding to the marked maximum voltage value and the marked minimum voltage value in the last collection; collecting voltage values of other battery cells and sending the voltage values to a battery management system main board; comparing the voltage values of all the collected battery cells, and marking the battery cell corresponding to the maximum voltage value and the battery cell corresponding to the minimum voltage value as a target battery cell for the next voltage extremum collection. According to the invention, the battery cell corresponding to the marked voltage maximum value and the voltage minimum value in the last acquisition is directly acquired, the acquired voltage maximum value and voltage minimum value are sent to the main board, excessive calculation processing is not needed, the main board can rapidly acquire voltage extremum data, and the voltage extremum data and other data have better synchronism.
Description
Technical Field
The invention belongs to the technical field of power batteries, and particularly relates to a method and a system for collecting a voltage extremum of a power battery pack and an electric automobile.
Background
The key information such as the voltage, the temperature, the current and the like of the battery core of the power battery is closely related to the current working state of the battery pack, the aspects of energy management, battery health management and the like. In time, the rapid and synchronous acquisition of each key information is a key point of the improvement of battery management technology. For example, the lowest voltage information in the battery pack can be obtained rapidly, so that the battery can be prevented from being over-discharged in time; the current power usage can be accurately assessed by synchronously acquiring voltage and current information. In the estimation of the state of charge of the power battery, the most critical parameters are the highest voltage and the lowest voltage, and under the working condition that the battery charge is rapidly exhausted or rapidly fully charged, the highest and the lowest voltage (extreme voltage) determine the SoC of the battery pack.
In the prior art, the highest voltage and the lowest voltage are calculated according to the statistical result after all the current cell data are acquired, the method is quite low-efficiency and has time delay, and in order to acquire extreme voltage rapidly, the working frequency of a sampling plate can only be increased, and the system power consumption is increased.
Disclosure of Invention
The embodiment of the invention aims to solve the technical problems of low efficiency, time delay or high power consumption of the existing synchronization method by providing a method and a system for collecting the voltage extremum of a power battery pack and an electric automobile.
In order to solve the technical problems, the invention provides a method for collecting a voltage extremum of a power battery pack, wherein the voltage extremum comprises a voltage maximum value and a voltage minimum value, and the method comprises the following steps:
step S1, receiving a voltage extreme value acquisition command;
step S2, collecting the maximum voltage value and the minimum voltage value of a target battery cell, and sending the maximum voltage value and the minimum voltage value to a battery management system main board, wherein the target battery cell is a battery cell corresponding to the maximum voltage value and a battery cell corresponding to the minimum voltage value marked in the last collection;
step S3, collecting voltage values of other electric cores in the power battery pack and sending the voltage values to a battery management system main board;
and S4, comparing the voltage values of all the collected battery cells, and marking the battery cell corresponding to the maximum voltage value and the battery cell corresponding to the minimum voltage value as a target battery cell for collecting the next voltage extreme value.
Further, in the step S4, if the number of the cells corresponding to the maximum voltage is more than two, the historical voltage change rates of all the cells corresponding to the maximum voltage are compared, and the cell with the largest change rate is used as the voltage maximum target cell.
Further, in the step S4, if the number of the battery cells corresponding to the voltage minimum value is more than two, the historical voltage change rates of all the battery cells corresponding to the voltage minimum value are compared, and the battery cell with the largest change rate is used as the target battery cell of the voltage minimum value.
Further, the voltage extremum acquisition command is triggered by a hard-wired signal of the battery management system motherboard.
The system comprises a power battery pack voltage extreme value acquisition system, a battery management system main board and a power battery pack voltage extreme value acquisition system, wherein the voltage extreme value comprises a voltage maximum value and a voltage minimum value, and the power battery pack voltage extreme value acquisition system comprises a battery cell voltage acquisition board and a battery management system main board which are connected through hard wires;
the battery cell voltage sampling plate is used for collecting the maximum voltage value and the minimum voltage value of a target battery cell when receiving a voltage extreme value collecting command sent by the battery management system main board and sending the maximum voltage value and the minimum voltage value to the battery management system main board, wherein the target battery cell is a battery cell corresponding to the maximum voltage value and the minimum voltage value marked in the last collection; the system is also used for collecting voltage values of other electric cores in the power battery pack and sending the voltage values to the battery management system mainboard after sending the voltage maximum value and the voltage minimum value to the battery management system mainboard;
the battery management system main board is used for comparing the voltage values of all the battery cells acquired by the battery cell voltage sampling board, and marking the battery cell corresponding to the voltage maximum value and the battery cell corresponding to the voltage minimum value as a target battery cell for the next voltage extremum acquisition.
Further, the battery management system main board is further configured to further compare historical voltage change rates of all the battery cells corresponding to the voltage maximum value when the number of the battery cells corresponding to the voltage maximum value is more than two, and use the battery cell with the largest change rate as the voltage maximum value target battery cell.
Further, the battery management system motherboard is further configured to further compare the historical voltage change rates of all the battery cells corresponding to the voltage minimum value when the number of the battery cells corresponding to the voltage minimum value is more than two, and use the battery cell with the largest change rate as the target battery cell of the voltage minimum value.
The electric automobile comprises a power battery pack voltage extreme value acquisition system, wherein the voltage extreme value comprises a voltage maximum value and a voltage minimum value, and the acquisition system comprises a battery cell voltage acquisition plate and a battery management system main board which are connected through hard wires;
the battery cell voltage sampling plate is used for collecting the maximum voltage value and the minimum voltage value of a target battery cell when receiving a voltage extreme value collecting command sent by the battery management system main board and sending the maximum voltage value and the minimum voltage value to the battery management system main board, wherein the target battery cell is a battery cell corresponding to the maximum voltage value and the minimum voltage value marked in the last collection; the system is also used for collecting voltage values of other electric cores in the power battery pack and sending the voltage values to the battery management system mainboard after sending the voltage maximum value and the voltage minimum value to the battery management system mainboard;
the battery management system main board is used for comparing the voltage values of all the battery cells acquired by the battery cell voltage sampling board, and marking the battery cell corresponding to the voltage maximum value and the battery cell corresponding to the voltage minimum value as a target battery cell for the next voltage extremum acquisition.
Further, the battery management system main board is further configured to further compare historical voltage change rates of all the battery cells corresponding to the voltage maximum value when the number of the battery cells corresponding to the voltage maximum value is more than two, and use the battery cell with the largest change rate as the voltage maximum value target battery cell.
Further, the battery management system motherboard is further configured to further compare the historical voltage change rates of all the battery cells corresponding to the voltage minimum value when the number of the battery cells corresponding to the voltage minimum value is more than two, and use the battery cell with the largest change rate as the target battery cell of the voltage minimum value.
The embodiment of the invention has the following beneficial effects: as can be seen from the above description, compared with the prior art, the invention has the following beneficial effects: after receiving the voltage extremum acquisition command, the invention directly acquires the battery cell corresponding to the voltage maximum value and the voltage minimum value marked in the last acquisition, and sends the acquired voltage maximum value and voltage minimum value to the main board, so that the main board can quickly acquire voltage extremum data without excessive calculation processing, and the voltage extremum data has better synchronism with other data (current, total voltage, temperature and the like).
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for collecting voltage extremes of a power battery pack according to an embodiment of the present invention.
Fig. 2 is a flowchart of a method for collecting voltage extremes of a power battery pack according to a second and third preferred embodiment of the present invention.
Detailed Description
The following description of embodiments refers to the accompanying drawings, which illustrate specific embodiments in which the invention may be practiced.
Referring to fig. 1, a first embodiment of the present invention provides a method for collecting a voltage extremum of a power battery pack, wherein the voltage extremum includes a voltage maximum value and a voltage minimum value, and the method specifically includes:
step S101, receiving a voltage extreme value acquisition command.
Specifically, the invention preferably triggers the voltage extremum acquisition command through the hard wire command signal of the main board, can avoid delay caused by task scheduling, communication delay and the like caused by software synchronization, and can not synchronously acquire the voltage extremum information after acquiring the key information such as temperature, total voltage, current and the like.
Step S102, rapidly acquiring a voltage maximum value (Pmax) and a voltage minimum value (Pmin) of a target battery cell, and sending the acquired voltage maximum value (Pmax) and voltage minimum value (Pmin) to a battery management system main board, wherein the target battery cell is a battery cell corresponding to the marked voltage maximum value and a battery cell corresponding to the marked voltage minimum value in the last acquisition.
Because the sampling points of current, total voltage and temperature are fewer, the corresponding sampling plate can be acquired at the first time, converted and sent in the first data packet without special treatment. For voltage sampling, in the current mainstream power battery, the number of battery cells in a battery pack is up to 100, and because the number of battery cell strings is large, a plurality of battery sampling chips (Analog Front End, AFE, sampling channels are used at 12 or 14 strings) are required to be matched for use to collect all battery cell voltages in the battery pack, for each AFE, after the collection and conversion are completed, the obtained voltage value of each AFE must be transmitted to a communication bus in a serial transmission mode, and because the voltage precision requirement is high, it is assumed that a voltage data result is that a transmission time t is required for 32 bits, if all transmission is completed, 12 bits are required, and time is required for 12t, and if N AFEs work cooperatively, the transmission is completed, at least 12 times of transmission time of N32 bits are required, and the voltage data transmitted first and the voltage data transmitted last time are different by 12 times of N times. However, if each AFE only quickly acquires two values of max and min, the data volume is compressed to 1/6 relative to the full 12 channel 12 voltage data, and the overall time is also compressed to 1/6, i.e., 6 times higher in synchronism.
Therefore, in the invention, after receiving the voltage extremum acquisition command, the voltage value of the target cell is directly acquired and sent to the main board, wherein the target cell is the cell corresponding to the maximum voltage value and the minimum voltage value marked in the last acquisition, that is, in the most ideal case, only one cell corresponding to the maximum voltage value and the minimum voltage value marked in the last acquisition respectively, the voltage data of the two cells are acquired and then directly sent to the main board, excessive calculation processing is not needed, the main board can quickly acquire the voltage extremum data, and the voltage extremum data and other data (current, total voltage, temperature and the like) have better synchronism.
Step S103, the voltage values of other electric cores in the power battery pack are collected completely and sent to a battery management system main board.
Step S104, voltage value comparison: comparing the voltage values of all the collected battery cells, and marking the battery cell corresponding to the maximum voltage value and the battery cell corresponding to the minimum voltage value as a target battery cell for the next voltage extremum collection.
Specifically, after the rapid acquisition is completed, the complete acquisition is performed, namely the voltage values of all the remaining battery cells are acquired, then the voltage values are compared with voltage extreme values Pmax and Pmin obtained by the rapid acquisition, the Pmax and Pmin are still the maximum voltage value and the minimum voltage value in all the voltage values respectively, and then the current acquired target battery cell is marked as the next voltage extreme value acquired target battery cell.
In this embodiment, after receiving the voltage extremum acquisition command, the battery cell corresponding to the voltage maximum value and the voltage minimum value marked during the last acquisition is directly acquired, and the acquired voltage maximum value and voltage minimum value are sent to the main board, so that excessive calculation processing is not required, the main board can quickly acquire voltage extremum data, and the voltage extremum data and other data (such as current, total voltage, temperature and the like) have better synchronism.
Further, after complete collection, for the voltage maximum value P1 and the voltage minimum value P2 in other battery cells, pmax is less than or equal to P1 or Pmin is more than or equal to P2, and the battery cells need to be treated according to conditions.
The method for synchronously acquiring the voltage extremum of the power battery pack provided by the second embodiment of the invention refers to fig. 2, and includes steps S201-S206. Step S201 to step S203 are the same as step S101 to step S103, and are not described in detail.
Step S204, voltage value comparison: comparing the voltage values of all the collected battery cells, and when Pmax is smaller than P1, P1 is the maximum voltage value in all the battery cells, and updating the maximum target battery cell is needed. Step S205 is entered, and when pmax=p1, step S305 is entered.
Step S205, the corresponding cell of P1 is marked to update the voltage maximum target cell, and the cell is used as the cell which is collected in the next rapid collection step of the voltage extremum collection.
In step S305, when pmax=p1, there are more than 2 cells corresponding to the voltage maximum value, all the cells (including P1 and Pmax) corresponding to the voltage maximum value are marked as the voltage maximum value target cell for the next acquisition.
Referring to fig. 2, in the method for synchronously obtaining the voltage extremum of the power battery pack according to the third embodiment of the present invention, when the previous steps are the same as steps S201-S203 and Pmin > P2 in the second embodiment, P2 is the minimum voltage value in all the battery cells, the target battery cell with the minimum voltage value needs to be updated, and the step S405 is entered, and when pmin=p2, the step S505 is entered.
And step S405, marking the battery cell corresponding to the P2 to update the voltage minimum target battery cell, and taking the battery cell as the battery cell which is collected in the next rapid collection step of the voltage extreme value collection.
Step S505, when pmin=p2, there are more than 2 cells corresponding to the voltage minimum, in which case, all the cells (including P2 and Pmin) corresponding to the voltage minimum are marked as the next acquired voltage maximum target cell
In this embodiment, after receiving the voltage extremum acquisition command, the battery cell corresponding to the voltage maximum value and the voltage minimum value marked during the last acquisition is directly acquired, and the acquired voltage maximum value and voltage minimum value are sent to the main board, so that excessive calculation processing is not required, the main board can quickly acquire voltage extremum data, and the voltage extremum data and other data (such as current, total voltage, temperature and the like) have better synchronism.
Preferably, based on the second and third embodiments, there may be a plurality of target battery cells, and the method for synchronously acquiring the voltage extremum of the power battery pack according to the fourth embodiment of the present invention may further include, before the step of rapidly acquiring:
step S6011, obtaining the number of target cells corresponding to the two voltage extreme values respectively; and judging whether the number of the target electric cores is more than or equal to 2, if so, entering a step S6012, otherwise, directly entering a step S202.
Step S6012, comparing the historical voltage change rates of the plurality of battery cells corresponding to the same voltage extremum, that is, comparing the historical voltage change rates of the plurality of target battery cells corresponding to the voltage maximum value (or the voltage minimum value), taking the battery cell with the largest change rate as the voltage maximum value (or the voltage minimum value) target battery cell, and then entering the following rapid acquisition step.
The battery cells in different life stages have a healthy battery cell voltage rising rate slower than that of a battery cell with a poor health state in the charge and discharge process; in the discharging process, the voltage drop rate of the healthy battery cell is slower than that of the battery cell with poor health state. In a typical SoC estimation, the voltages max and min determine the capacity of the battery pack, and how much of the current capacity is. Therefore, the battery cell with the largest change rate in the maximum value or the extreme value of the battery cell can be monitored according to the historical trend, and the voltage maximum value target battery cell and the voltage minimum value target battery cell can be locked rapidly.
The fifth embodiment of the invention also provides a system for collecting the voltage extremum of the power battery pack, wherein the voltage extremum comprises a voltage maximum value and a voltage minimum value, and the collecting system comprises a battery cell voltage sampling plate and a battery management system main board which are connected through hard wires.
The battery cell voltage sampling plate is used for collecting the maximum voltage value and the minimum voltage value of a target battery cell when receiving a voltage extreme value collecting command sent by the battery management system main board and sending the maximum voltage value and the minimum voltage value to the battery management system main board, wherein the target battery cell is a battery cell corresponding to the maximum voltage value and the minimum voltage value marked in the last collection; and the system is also used for collecting the voltage values of other electric cores in the power battery pack and sending the voltage values to the battery management system mainboard after sending the voltage maximum value and the voltage minimum value to the battery management system mainboard.
The battery management system main board is used for comparing the voltage values of all the battery cells acquired by the battery cell voltage sampling board, and marking the battery cell corresponding to the voltage maximum value and the battery cell corresponding to the voltage minimum value as a target battery cell for the next voltage extremum acquisition.
Further, the battery management system main board is further configured to further compare historical voltage change rates of all the battery cells corresponding to the voltage maximum value when the number of the battery cells corresponding to the voltage maximum value is more than two, and use the battery cell with the largest change rate as the voltage maximum value target battery cell.
Further, the battery management system motherboard is further configured to further compare the historical voltage change rates of all the battery cells corresponding to the voltage minimum value when the number of the battery cells corresponding to the voltage minimum value is more than two, and use the battery cell with the largest change rate as the target battery cell of the voltage minimum value.
Regarding the working principle and process of the collecting system for the voltage extremum of the power battery pack in this embodiment, reference is made to the description of the first embodiment of the present invention, and the description is omitted here.
The fifth embodiment of the invention also provides an electric automobile, which comprises a power battery pack voltage extremum acquisition system, wherein the voltage extremum comprises a voltage maximum value and a voltage minimum value, and the acquisition system comprises a battery cell voltage acquisition plate and a battery management system main board which are connected through hard wires.
The battery cell voltage sampling plate is used for collecting the maximum voltage value and the minimum voltage value of a target battery cell when receiving a voltage extreme value collecting command sent by the battery management system main board and sending the maximum voltage value and the minimum voltage value to the battery management system main board, wherein the target battery cell is a battery cell corresponding to the maximum voltage value and the minimum voltage value marked in the last collection; and the system is also used for collecting the voltage values of other electric cores in the power battery pack and sending the voltage values to the battery management system mainboard after sending the voltage maximum value and the voltage minimum value to the battery management system mainboard.
The battery management system main board is used for comparing the voltage values of all the battery cells acquired by the battery cell voltage sampling board, and marking the battery cell corresponding to the voltage maximum value and the battery cell corresponding to the voltage minimum value as a target battery cell for the next voltage extremum acquisition.
Further, the battery management system main board is further configured to further compare historical voltage change rates of all the battery cells corresponding to the voltage maximum value when the number of the battery cells corresponding to the voltage maximum value is more than two, and use the battery cell with the largest change rate as the voltage maximum value target battery cell.
Further, the battery management system motherboard is further configured to further compare the historical voltage change rates of all the battery cells corresponding to the voltage minimum value when the number of the battery cells corresponding to the voltage minimum value is more than two, and use the battery cell with the largest change rate as the target battery cell of the voltage minimum value.
Regarding the working principle and process of the electric vehicle in this embodiment, reference is made to the description of the first embodiment of the present invention, and the description is omitted here.
The foregoing disclosure is illustrative of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (10)
1. The method for collecting the voltage extreme value of the power battery pack is characterized by comprising the following steps of:
step S1, receiving a voltage extreme value acquisition command;
step S2, collecting the maximum voltage value and the minimum voltage value of a target battery cell, and sending the maximum voltage value and the minimum voltage value to a battery management system main board, wherein the target battery cell is a battery cell corresponding to the maximum voltage value and a battery cell corresponding to the minimum voltage value marked in the last collection;
step S3, collecting voltage values of other electric cores in the power battery pack and sending the voltage values to a battery management system main board;
and S4, comparing the voltage values of all the collected battery cells, and marking the battery cell corresponding to the maximum voltage value and the battery cell corresponding to the minimum voltage value as a target battery cell for collecting the next voltage extreme value.
2. The method according to claim 1, wherein in the step S4, if the number of the cells corresponding to the maximum voltage is more than two, the historical voltage change rates of all the cells corresponding to the maximum voltage are compared, and the cell with the largest change rate is used as the voltage maximum target cell.
3. The method according to claim 1, wherein in the step S4, if the number of the cells corresponding to the voltage minimum is two or more, the historical voltage change rates of all the cells corresponding to the voltage minimum are compared, and the cell with the largest change rate is used as the voltage minimum target cell.
4. A method of collecting voltage extremes of a power battery pack according to any one of claims 1 to 3, wherein the voltage extreme collection command is triggered by a hard-wired signal from a motherboard of a battery management system.
5. The acquisition system of the voltage extreme value of the power battery pack is characterized by comprising a battery cell voltage acquisition plate and a battery management system main board which are connected through hard wires;
the battery cell voltage sampling plate is used for collecting the maximum voltage value and the minimum voltage value of a target battery cell when receiving a voltage extreme value collecting command sent by the battery management system main board and sending the maximum voltage value and the minimum voltage value to the battery management system main board, wherein the target battery cell is a battery cell corresponding to the maximum voltage value and the minimum voltage value marked in the last collection; the system is also used for collecting voltage values of other electric cores in the power battery pack and sending the voltage values to the battery management system mainboard after sending the voltage maximum value and the voltage minimum value to the battery management system mainboard;
the battery management system main board is used for comparing the voltage values of all the battery cells acquired by the battery cell voltage sampling board, and marking the battery cell corresponding to the voltage maximum value and the battery cell corresponding to the voltage minimum value as a target battery cell for the next voltage extremum acquisition.
6. The system of claim 5, wherein the battery management system motherboard is further configured to compare historical voltage change rates of all the cells corresponding to the maximum voltage value when the number of cells corresponding to the maximum voltage value is more than two, and use the cell with the largest change rate as the voltage maximum target cell.
7. The system according to claim 5 or 6, wherein the battery management system motherboard is further configured to compare historical voltage change rates of all the battery cells corresponding to the voltage minimum value when the number of battery cells corresponding to the voltage minimum value is more than two, and use the battery cell with the largest change rate as the voltage minimum value target battery cell.
8. The electric automobile is characterized by comprising a power battery pack voltage extreme value acquisition system, wherein the acquisition system comprises a battery cell voltage acquisition plate and a battery management system main board which are connected through a hard wire;
the battery cell voltage sampling plate is used for collecting the maximum voltage value and the minimum voltage value of a target battery cell when receiving a voltage extreme value collecting command sent by the battery management system main board and sending the maximum voltage value and the minimum voltage value to the battery management system main board, wherein the target battery cell is a battery cell corresponding to the maximum voltage value and the minimum voltage value marked in the last collection; the system is also used for collecting voltage values of other electric cores in the power battery pack and sending the voltage values to the battery management system mainboard after sending the voltage maximum value and the voltage minimum value to the battery management system mainboard;
the battery management system main board is used for comparing the voltage values of all the battery cells acquired by the battery cell voltage sampling board, and marking the battery cell corresponding to the voltage maximum value and the battery cell corresponding to the voltage minimum value as a target battery cell for the next voltage extremum acquisition.
9. The electric automobile of claim 8, wherein the battery management system motherboard is further configured to compare historical voltage change rates of all the battery cells corresponding to the voltage maximum value when there are more than two battery cells corresponding to the voltage maximum value, and use the battery cell with the largest change rate as the voltage maximum value target battery cell.
10. The electric automobile of claim 8 or 9, wherein the battery management system motherboard is further configured to compare the historical voltage change rates of all the battery cells corresponding to the voltage minimum value when the number of the battery cells corresponding to the voltage minimum value is more than two, and use the battery cell with the largest change rate as the voltage minimum value target battery cell.
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