CN113960474A - Method and system for acquiring voltage extreme value of power battery pack and electric vehicle - Google Patents
Method and system for acquiring voltage extreme value of power battery pack and electric vehicle Download PDFInfo
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- CN113960474A CN113960474A CN202010638672.0A CN202010638672A CN113960474A CN 113960474 A CN113960474 A CN 113960474A CN 202010638672 A CN202010638672 A CN 202010638672A CN 113960474 A CN113960474 A CN 113960474A
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- 238000005070 sampling Methods 0.000 claims description 24
- 230000001960 triggered effect Effects 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 description 5
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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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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a method and a system for acquiring a voltage extreme value of a power battery pack and an electric automobile, wherein the method comprises the following steps: receiving a voltage extreme value acquisition command; acquiring a voltage maximum value and a voltage minimum value of a target battery cell, and sending the voltage maximum value and the voltage minimum value to a battery management system mainboard, wherein the target battery cell is a battery cell corresponding to the voltage maximum value and the voltage minimum value marked in the last acquisition; collecting voltage values of other battery cores and sending the voltage values to a battery management system mainboard; and comparing the acquired voltage values of all the battery cores, and marking the battery core corresponding to the maximum voltage value and the battery core corresponding to the minimum voltage value as a target battery core for next voltage extreme value acquisition. The method and the device directly collect the battery cells corresponding to the voltage maximum value and the voltage minimum value marked in the last collection, and send the collected voltage maximum value and the collected voltage minimum value to the mainboard without excessive calculation processing, the mainboard can quickly obtain voltage extreme value data, and the voltage extreme value data is better in synchronism with other data.
Description
Technical Field
The invention belongs to the technical field of power batteries, and particularly relates to a method and a system for acquiring a voltage extreme value of a power battery pack and an electric automobile.
Background
The key information of the power battery such as the cell voltage, the temperature and the current is closely related to the current working state of the battery pack, the energy management, the battery health management and the like. And timely, rapidly and synchronously acquiring each key information is the key point of the improvement of the battery management technology. For example, the lowest voltage information in the battery pack is quickly acquired, so that the over-discharge of the battery can be prevented in time; by synchronously acquiring the voltage and current information, the current power use condition can be accurately evaluated. 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 electric quantity of the battery is exhausted or fully charged, the highest and lowest voltages (extreme voltage) determine the SoC of the battery pack.
In the prior art, generally, after all current electric core data are acquired, the highest and lowest voltages are calculated according to statistical results, the method is very inefficient and has time delay, and in order to acquire extreme voltage quickly, the working frequency of a sampling plate can only be increased, which increases the power consumption of a system.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide a method and a system for acquiring a voltage extreme value of a power battery pack and an electric vehicle, so as to solve the problems of low efficiency, time delay or high power consumption of the existing synchronization method.
In order to solve the technical problem, the invention provides a method for collecting a voltage extreme value of a power battery pack, wherein the voltage extreme value 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 voltage maximum value and the voltage minimum value of a target battery cell, and sending the voltage maximum value and the voltage minimum value to a battery management system mainboard, wherein the target battery cell is a battery cell corresponding to the voltage maximum value and a battery cell corresponding to the voltage minimum 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 mainboard;
and step S4, comparing the acquired voltage values of all the battery cells, and marking the battery cell corresponding to the maximum voltage value and the battery cell corresponding to the minimum voltage value as the target battery cell for the next voltage extreme value acquisition.
Further, in step S4, if the number of the battery cells corresponding to the maximum voltage value is two or more, the historical voltage change rates of all the battery cells corresponding to the maximum voltage value are compared, and the battery cell with the largest change rate is used as the target battery cell for the maximum voltage value.
Further, in step S4, if the number of the battery cells corresponding to the minimum voltage value is two or more, the historical voltage change rates of all the battery cells corresponding to the minimum voltage value are compared, and the battery cell with the largest change rate is used as the target battery cell with the minimum voltage value.
Further, the voltage extreme value acquisition command is triggered by a hard-wired signal of a battery management system mainboard.
A collection system for a voltage extreme value of a power battery pack comprises a maximum voltage value and a minimum voltage value, and comprises a battery cell voltage sampling board and a battery management system mainboard which are connected through hard wires;
the battery cell voltage sampling board is used for acquiring the maximum voltage value and the minimum voltage value of a target battery cell when receiving a voltage extreme value acquisition command sent by the battery management system mainboard, and sending the maximum voltage value and the minimum voltage value to the battery management system mainboard, wherein the target battery cell is a battery cell corresponding to the maximum voltage value marked during the last acquisition and a battery cell corresponding to the minimum voltage value; the power battery pack is also used for collecting voltage values of other battery cores in the power battery pack and sending the voltage values to the battery management system mainboard after sending the maximum voltage value and the minimum voltage value to the battery management system mainboard;
and the battery management system mainboard is used for comparing the voltage values of all the battery cores acquired by the battery core voltage sampling plate, marking the battery core corresponding to the maximum voltage value and the battery core corresponding to the minimum voltage value as a target battery core acquired by the next voltage extreme value.
Further, the battery management system motherboard is further configured to, when the number of the battery cells corresponding to the maximum voltage value is more than two, further compare the historical voltage change rates of all the battery cells corresponding to the maximum voltage value, and use the battery cell with the largest change rate as the target battery cell with the maximum voltage value.
Further, the battery management system motherboard is further configured to, when the number of the battery cells corresponding to the minimum voltage value is more than two, further compare the historical voltage change rates of all the battery cells corresponding to the minimum voltage value, and use the battery cell with the largest change rate as the target battery cell with the minimum voltage value.
An electric automobile comprises an acquisition system of a power battery pack voltage extreme value, wherein the voltage extreme value comprises a voltage maximum value and a voltage minimum value, and the acquisition system comprises a battery cell voltage sampling board and a battery management system mainboard which are connected through hard wires;
the battery cell voltage sampling board is used for acquiring the maximum voltage value and the minimum voltage value of a target battery cell when receiving a voltage extreme value acquisition command sent by the battery management system mainboard, and sending the maximum voltage value and the minimum voltage value to the battery management system mainboard, wherein the target battery cell is a battery cell corresponding to the maximum voltage value marked during the last acquisition and a battery cell corresponding to the minimum voltage value; the power battery pack is also used for collecting voltage values of other battery cores in the power battery pack and sending the voltage values to the battery management system mainboard after sending the maximum voltage value and the minimum voltage value to the battery management system mainboard;
and the battery management system mainboard is used for comparing the voltage values of all the battery cores acquired by the battery core voltage sampling plate, marking the battery core corresponding to the maximum voltage value and the battery core corresponding to the minimum voltage value as a target battery core acquired by the next voltage extreme value.
Further, the battery management system motherboard is further configured to, when the number of the battery cells corresponding to the maximum voltage value is more than two, further compare the historical voltage change rates of all the battery cells corresponding to the maximum voltage value, and use the battery cell with the largest change rate as the target battery cell with the maximum voltage value.
Further, the battery management system motherboard is further configured to, when the number of the battery cells corresponding to the minimum voltage value is more than two, further compare the historical voltage change rates of all the battery cells corresponding to the minimum voltage value, and use the battery cell with the largest change rate as the target battery cell with the minimum voltage 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 beneficial effects of the present invention are: after receiving a voltage extreme value acquisition command, the invention directly acquires the electric core corresponding to the voltage maximum value and the voltage minimum value marked in the last acquisition, and transmits the acquired voltage maximum value and the acquired voltage minimum value to the mainboard without excessive calculation processing, the mainboard can quickly acquire voltage extreme value data, and the voltage extreme value data and other data (current, total voltage, temperature and the like) have better synchronism.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a method for collecting an extreme voltage value of a power battery pack according to an embodiment of the present invention.
Fig. 2 is a flowchart of a second preferred method and a third preferred method for collecting a voltage extreme value of a power battery pack according to the second embodiment of the invention.
Detailed Description
The following description of the embodiments refers to the accompanying drawings, which are included to 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 extreme value of a power battery pack, where the voltage extreme value includes a maximum voltage value and a minimum voltage value, and the method specifically includes:
step S101, receiving a voltage extreme value acquisition command.
Specifically, the voltage extreme value acquisition command is preferably triggered by a hard-line instruction signal of the mainboard, so that delay caused by task scheduling, communication delay and the like due to software synchronization can be avoided, and the voltage extreme value information cannot be synchronously acquired after key information such as temperature, total voltage, current and the like is acquired.
Step S102, rapidly collecting, collecting a voltage maximum value (Pmax) and a voltage minimum value (Pmin) of a target electric core, and sending the voltage maximum value (Pmax) and the voltage minimum value (Pmin) to a battery management system mainboard, wherein the target electric core is an electric core corresponding to the voltage maximum value and an electric core corresponding to the voltage minimum value marked in the last collection.
Because sampling points of current, total voltage and temperature are less, the corresponding sampling plates can acquire and complete conversion in the first time and can finish sending in the first data packet without special processing. For voltage sampling, currently, a main flow power battery has as many as 100 strings of battery cells in a battery pack, because the number of the battery cells is large, a plurality of battery sampling chips (Analog Front End, AFE, sampling channels are 12 or 14 strings) are required to be used in cooperation to collect all the battery cell voltages in the battery pack, for each AFE, after the collection and conversion are completed, the voltage values obtained by the 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 32 bits and requires transmission time t, if all the transmission is completed, 12 bits and 12t are consumed, if N AFEs work cooperatively, the transmission time of 12N × 32 bits is at least required for completing all the transmission of the data, and the difference between the voltage data sent out first and the voltage data sent out last is 12 × N times. However, if each AFE acquires only two values max and min quickly, the data volume is compressed to 1/6 and the overall time is also compressed to 1/6 relative to the full 12 channels of 12 voltage data, i.e. the synchronization is improved by 6 times.
Therefore, in the invention, after receiving a voltage extreme value acquisition command, the voltage value of a target battery cell is directly acquired and sent to the mainboard, wherein the target battery cell is a battery cell corresponding to the voltage maximum value and the voltage minimum value marked in the last acquisition, that is, the most ideal situation is that only one battery cell corresponds to the voltage maximum value and the voltage minimum value marked in the last acquisition is respectively used for directly sending the voltage data of two battery cells to the mainboard after the voltage data of the two battery cells are acquired, excessive calculation processing is not needed, the mainboard can quickly acquire the voltage extreme value data, and the voltage extreme value data has better synchronization with other data (current, total voltage, temperature and the like).
And S103, completely collecting, collecting voltage values of other electric cores in the power battery pack and sending the voltage values to a battery management system mainboard.
Step S104, comparing voltage values: and comparing the acquired voltage values of all the battery cores, and marking the battery core corresponding to the maximum voltage value and the battery core corresponding to the minimum voltage value as a target battery core for next voltage extreme value acquisition.
Specifically, after the rapid collection is completed, complete collection is performed, that is, voltage values of all the remaining battery cells are collected, and then the voltage values are compared with the voltage extreme values Pmax and Pmin obtained by the rapid collection, where Pmax and Pmin are still the maximum voltage value and the minimum voltage value of all the voltage values, respectively, and then the target battery cell collected this time is marked as the target battery cell for the next voltage extreme value collection.
In this embodiment, after receiving the voltage extreme value acquisition command, the electric core that the voltage maximum value and the voltage minimum value that mark when directly gathering last time correspond to will gather voltage maximum value and voltage minimum value and send the mainboard to, need not to do too much calculation processing, and the mainboard can acquire voltage extreme value data fast, and voltage extreme value data is better with other data (electric current, total voltage, temperature etc.) synchronism.
Further, after complete acquisition, for the maximum voltage value P1 and the minimum voltage value P2 in other battery cells, Pmax is less than or equal to P1, or Pmin is more than or equal to P2, and at this time, the situation needs to be handled according to the situation.
Referring to fig. 2, the method for synchronously acquiring a voltage extreme of a power battery pack according to the second embodiment of the present invention includes steps S201 to S206. The steps S201 to S203 are the same as the steps S101 to S103, and are not described again.
Step S204, comparing voltage values: and comparing the acquired voltage values of all the battery cells, and when Pmax is less than P1, if the voltage value of P1 is the maximum voltage value of all the battery cells, updating the maximum target battery cell. The process proceeds to step S205, and when Pmax is P1, the process proceeds to step S305.
Step S205, marking the electric core corresponding to P1 to update the voltage maximum value target electric core as the electric core preferentially acquired in the next quick acquisition step of voltage extreme value acquisition.
Step S305, when Pmax is equal to P1, there are more than 2 cells corresponding to the maximum voltage value, and all the cells (including P1 and Pmax) corresponding to the maximum voltage value are marked as the target cell of the maximum voltage value to be collected next time.
Referring to fig. 2, the previous steps are the same as the second step S201 to S203 in the third embodiment, when Pmin > P2, if P2 is the minimum voltage value among all the battery cells, the target battery cell with the minimum voltage value needs to be updated, and the step S405 is executed, and if Pmin is P2, the step S505 is executed.
Step S405, marking the electric core corresponding to P2 to update the target electric core with the minimum voltage value as the electric core preferentially acquired in the fast acquisition step of the next voltage extreme value acquisition.
Step S505, when Pmin is equal to P2, there are more than 2 cells corresponding to the minimum voltage value, in this case, all the cells (including P2 and Pmin) corresponding to the minimum voltage value are marked as the target cell of the maximum voltage value acquired next time
In this embodiment, after receiving the voltage extreme value acquisition command, the electric core that the voltage maximum value and the voltage minimum value that mark when directly gathering last time correspond to will gather voltage maximum value and voltage minimum value and send the mainboard to, need not to do too much calculation processing, and the mainboard can acquire voltage extreme value data fast, and voltage extreme value data is better with other data (electric current, total voltage, temperature etc.) synchronism.
Preferably, based on the second and third embodiments, a plurality of target battery cells may exist, and the method for synchronously acquiring the voltage extreme value of the power battery pack provided by the fourth embodiment of the present invention may further include, before the step of rapidly acquiring:
step S6011, acquiring the number of target battery cells corresponding to the two voltage extreme values respectively; and judging whether the number of the target battery cells is greater than or equal to 2, if so, entering a step S6012, and otherwise, directly entering a step S202.
Step S6012, comparing the historical voltage change rates of the multiple battery cells corresponding to the same voltage extreme value, that is, comparing the historical voltage change rates of the multiple target battery cells corresponding to the maximum voltage value (or the minimum voltage value), taking the battery cell with the maximum change rate as the target battery cell with the maximum voltage value (or the minimum voltage value), and then performing the subsequent fast acquisition step.
In the process of charging and discharging, the voltage rising rate of the healthy battery cell is slower than that of the battery cell in a bad health state; in the discharging process, the voltage drop rate of the healthy cell is slower than that of the cell with poor health state. In a typical SoC estimation, the voltages max and min determine the capacity of the battery pack, which is the current capacity. Therefore, the maximum value of the battery cell or the battery cell with the maximum change rate in the extreme value can be monitored according to the historical trend, and the target battery cell with the maximum voltage value and the target battery cell with the minimum voltage value can be quickly locked.
Corresponding to the method for acquiring the voltage extreme value of the power battery pack provided by the embodiment one of the invention, the embodiment five of the invention also provides an acquisition system for the voltage extreme value of the power battery pack, wherein the voltage extreme value comprises a voltage maximum value and a voltage minimum value, and the acquisition system comprises a cell voltage sampling board and a battery management system mainboard which are connected through hard wires.
The battery cell voltage sampling board is used for acquiring the maximum voltage value and the minimum voltage value of a target battery cell when receiving a voltage extreme value acquisition command sent by the battery management system mainboard, and sending the maximum voltage value and the minimum voltage value to the battery management system mainboard, wherein the target battery cell is a battery cell corresponding to the maximum voltage value marked during the last acquisition and a battery cell corresponding to the minimum voltage value; and the power battery pack is also used for acquiring voltage values of other battery cores in the power battery pack and sending the voltage values to the battery management system mainboard after sending the maximum voltage value and the minimum voltage value to the battery management system mainboard.
And the battery management system mainboard is used for comparing the voltage values of all the battery cores acquired by the battery core voltage sampling plate, marking the battery core corresponding to the maximum voltage value and the battery core corresponding to the minimum voltage value as a target battery core acquired by the next voltage extreme value.
Further, the battery management system motherboard is further configured to, when the number of the battery cells corresponding to the maximum voltage value is more than two, further compare the historical voltage change rates of all the battery cells corresponding to the maximum voltage value, and use the battery cell with the largest change rate as the target battery cell with the maximum voltage value.
Further, the battery management system motherboard is further configured to, when the number of the battery cells corresponding to the minimum voltage value is more than two, further compare the historical voltage change rates of all the battery cells corresponding to the minimum voltage value, and use the battery cell with the largest change rate as the target battery cell with the minimum voltage value.
For the working principle and process of the system for acquiring the voltage extreme value of the power battery pack of this embodiment, reference is made to the description of the first embodiment of the present invention, and details are not described herein again.
Corresponding to the collection system of the voltage extreme value of the power battery pack provided by the fifth embodiment of the invention, the fifth embodiment of the invention also provides an electric automobile which comprises the collection system of the voltage extreme value of the power battery pack, wherein the voltage extreme value comprises a voltage maximum value and a voltage minimum value, and the collection system comprises a battery cell voltage sampling board and a battery management system mainboard which are connected through hard wires.
The battery cell voltage sampling board is used for acquiring the maximum voltage value and the minimum voltage value of a target battery cell when receiving a voltage extreme value acquisition command sent by the battery management system mainboard, and sending the maximum voltage value and the minimum voltage value to the battery management system mainboard, wherein the target battery cell is a battery cell corresponding to the maximum voltage value marked during the last acquisition and a battery cell corresponding to the minimum voltage value; and the power battery pack is also used for acquiring voltage values of other battery cores in the power battery pack and sending the voltage values to the battery management system mainboard after sending the maximum voltage value and the minimum voltage value to the battery management system mainboard.
And the battery management system mainboard is used for comparing the voltage values of all the battery cores acquired by the battery core voltage sampling plate, marking the battery core corresponding to the maximum voltage value and the battery core corresponding to the minimum voltage value as a target battery core acquired by the next voltage extreme value.
Further, the battery management system motherboard is further configured to, when the number of the battery cells corresponding to the maximum voltage value is more than two, further compare the historical voltage change rates of all the battery cells corresponding to the maximum voltage value, and use the battery cell with the largest change rate as the target battery cell with the maximum voltage value.
Further, the battery management system motherboard is further configured to, when the number of the battery cells corresponding to the minimum voltage value is more than two, further compare the historical voltage change rates of all the battery cells corresponding to the minimum voltage value, and use the battery cell with the largest change rate as the target battery cell with the minimum voltage value.
For the working principle and process of the electric vehicle in this embodiment, refer to the description of the first embodiment of the present invention, and are not further described herein.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (10)
1. A method for collecting a voltage extreme value of a power battery pack is characterized by comprising the following steps:
step S1, receiving a voltage extreme value acquisition command;
step S2, collecting the voltage maximum value and the voltage minimum value of a target battery cell, and sending the voltage maximum value and the voltage minimum value to a battery management system mainboard, wherein the target battery cell is a battery cell corresponding to the voltage maximum value and a battery cell corresponding to the voltage minimum 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 mainboard;
and step S4, comparing the acquired voltage values of all the battery cells, and marking the battery cell corresponding to the maximum voltage value and the battery cell corresponding to the minimum voltage value as the target battery cell for the next voltage extreme value acquisition.
2. The method for collecting the voltage extreme value of the power battery pack according to claim 1, wherein in step S4, if the number of the battery cells corresponding to the maximum voltage value is two or more, historical voltage change rates of all the battery cells corresponding to the maximum voltage value are compared, and the battery cell with the maximum change rate is used as the target battery cell with the maximum voltage value.
3. The method for collecting the voltage extreme value of the power battery pack according to claim 1, wherein in step S4, if the number of the battery cells corresponding to the voltage minimum value is more than two, 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 with the voltage minimum value.
4. The method for collecting the voltage extreme of the 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 of a mainboard of a battery management system.
5. A collection system for a voltage extreme value of a power battery pack is characterized by comprising a battery cell voltage sampling board and a battery management system mainboard which are connected through hard wires;
the battery cell voltage sampling board is used for acquiring the maximum voltage value and the minimum voltage value of a target battery cell when receiving a voltage extreme value acquisition command sent by the battery management system mainboard, and sending the maximum voltage value and the minimum voltage value to the battery management system mainboard, wherein the target battery cell is a battery cell corresponding to the maximum voltage value marked during the last acquisition and a battery cell corresponding to the minimum voltage value; the power battery pack is also used for collecting voltage values of other battery cores in the power battery pack and sending the voltage values to the battery management system mainboard after sending the maximum voltage value and the minimum voltage value to the battery management system mainboard;
and the battery management system mainboard is used for comparing the voltage values of all the battery cores acquired by the battery core voltage sampling plate, marking the battery core corresponding to the maximum voltage value and the battery core corresponding to the minimum voltage value as a target battery core acquired by the next voltage extreme value.
6. The system for acquiring a voltage extreme value of a power battery pack according to claim 5, wherein the battery management system motherboard is further configured to, when the number of the battery cells corresponding to the maximum voltage value is two or more, further compare historical voltage change rates of all the battery cells corresponding to the maximum voltage value, and use the battery cell with the maximum change rate as the target battery cell with the maximum voltage value.
7. The system for acquiring a voltage extreme value of a power battery pack according to claim 5 or 6, wherein the battery management system motherboard is further configured to, when the number of the battery cells corresponding to the voltage minimum value is two or more, further compare historical voltage change rates of all the battery cells corresponding to the voltage minimum value, and use the battery cell with the largest change rate as the target battery cell with the voltage minimum value.
8. The electric automobile is characterized by comprising an acquisition system of a power battery pack voltage extreme value, wherein the acquisition system comprises a battery cell voltage sampling board and a battery management system mainboard which are connected through hard wires;
the battery cell voltage sampling board is used for acquiring the maximum voltage value and the minimum voltage value of a target battery cell when receiving a voltage extreme value acquisition command sent by the battery management system mainboard, and sending the maximum voltage value and the minimum voltage value to the battery management system mainboard, wherein the target battery cell is a battery cell corresponding to the maximum voltage value marked during the last acquisition and a battery cell corresponding to the minimum voltage value; the power battery pack is also used for collecting voltage values of other battery cores in the power battery pack and sending the voltage values to the battery management system mainboard after sending the maximum voltage value and the minimum voltage value to the battery management system mainboard;
and the battery management system mainboard is used for comparing the voltage values of all the battery cores acquired by the battery core voltage sampling plate, marking the battery core corresponding to the maximum voltage value and the battery core corresponding to the minimum voltage value as a target battery core acquired by the next voltage extreme value.
9. The electric vehicle according to claim 8, wherein the battery management system motherboard is further configured to, when the number of the cells corresponding to the maximum voltage value is two or more, further compare historical voltage change rates of all the cells corresponding to the maximum voltage value, and use the cell with the largest change rate as the target cell with the maximum voltage value.
10. The electric vehicle according to claim 8 or 9, wherein the battery management system motherboard is further configured to, when the number of the cells corresponding to the minimum voltage value is two or more, further compare historical voltage change rates of all the cells corresponding to the minimum voltage value, and use the cell with the largest change rate as the target cell with the minimum voltage value.
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| CN113954688A (en) * | 2020-07-01 | 2022-01-21 | 广汽埃安新能源汽车有限公司 | Method and system for estimating driving range of electric automobile |
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