CN112952217A - Battery cell voltage acquisition device and method and electric automobile - Google Patents
Battery cell voltage acquisition device and method and electric automobile Download PDFInfo
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- CN112952217A CN112952217A CN201911165828.1A CN201911165828A CN112952217A CN 112952217 A CN112952217 A CN 112952217A CN 201911165828 A CN201911165828 A CN 201911165828A CN 112952217 A CN112952217 A CN 112952217A
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- 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
- H01M10/4285—Testing apparatus
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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]
- G01R31/364—Battery terminal connectors with integrated measuring arrangements
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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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3835—Arrangements for monitoring battery or accumulator variables, e.g. SoC involving only 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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
Abstract
The invention provides a cell voltage acquisition device, a cell voltage acquisition method and an electric automobile, and relates to the technical field of battery structures, wherein the cell voltage acquisition device comprises: a controller; the multi-path voltage acquisition circuit is connected with the controller; the battery module comprises a plurality of battery modules, wherein a plurality of battery cores are connected in series in each battery module, and a copper bar is connected in series between every two adjacent battery modules; the first end of the copper bar is connected with the positive electrode of the first battery module, and the second end of the copper bar is connected with the negative electrode of the second battery module; the multi-path voltage acquisition circuit is connected with the negative electrode and the first end of each battery cell in the first battery module and the positive electrode of each battery cell in the second battery module one by one; after receiving the preset time length of the cell voltage acquisition instruction, the controller acquires the current charging/discharging current and the voltage acquired by each voltage acquisition circuit, and determines the current voltage drop of each cell according to the charging/discharging current and the voltage acquired by each voltage acquisition circuit. The invention reduces the number of voltage acquisition circuits and the risk of chip damage.
Description
Technical Field
The invention relates to the technical field of battery structures, in particular to a cell voltage acquisition device and method and an electric automobile.
Background
It is known that, battery system is formed by a plurality of battery module series connection, the quantity of electric core in every battery module is not necessarily just to match with voltage acquisition circuit, in order to practice thrift the cost, a voltage acquisition circuit condition that need gather two or more modules has appeared, and be connected through the copper bar between two battery modules, need solitary voltage acquisition circuit of the same way to gather copper bar voltage among the prior art, thereby eliminate the influence that the copper bar caused to electric core voltage acquisition when flowing through the heavy current, and this kind of mode has following two defects, one is the cost is improved, another is that the anti reverse voltage ability of the chip in the current voltage acquisition circuit is generally weak, the reverse voltage that produces on the copper bar probably leads to the chip to damage.
Disclosure of Invention
The invention aims to provide a cell voltage acquisition device and method and an electric automobile, so that the problem that an acquisition chip is damaged due to reverse voltage in the prior art is solved.
In order to achieve the above object, the present invention provides a cell voltage acquisition apparatus, including:
a controller;
the multi-path voltage acquisition circuit is connected with the controller;
the battery module comprises a plurality of battery modules, a plurality of battery cores are connected in series in each battery module, and a copper bar is connected in series between every two adjacent battery modules;
the first end of the copper bar is connected with the positive electrode of the first battery module, and the second end of the copper bar is connected with the negative electrode of the second battery module;
the voltage acquisition circuits are respectively connected with the negative electrodes of the battery cells in the first battery module, the first end and the positive electrodes of the battery cells in the second battery module one by one;
the controller obtains the current charging/discharging current and the voltage collected by each voltage collecting circuit after receiving the preset time length of the cell voltage collecting instruction, and determines the current voltage drop of each cell according to the charging/discharging current and the voltage collected by each voltage collecting circuit.
Optionally, when the current voltage drop of each of the battery cells is determined according to the charging/discharging current and the voltage collected by each of the voltage collecting circuits, the controller determines the current voltage drop of the first battery cell according to the pre-stored internal resistance of the copper bar, the first voltage at the first end, the second voltage at the positive electrode of the first battery cell connected to the negative electrode of the second battery module in the second battery module, and the current charging/discharging current.
Optionally, if the current mode is the charging mode, when determining the current voltage drop of the first battery cell, the controller determines a third voltage at the second end according to the internal resistance, the current charging current, and the first voltage;
determining a current voltage drop of the first battery cell according to the second voltage and the third voltage; wherein the current voltage drop of the first cell is a difference between the second voltage and the third voltage.
Optionally, if the current voltage is in the discharging mode, when the current voltage drop of the first battery cell is determined, the controller determines a fourth voltage at the second end according to the internal resistance, the current discharging current, and the first voltage;
determining a current voltage drop of the first battery cell according to the second voltage and the fourth voltage; wherein the current voltage drop of the first cell is the sum of the second voltage and the fourth voltage.
Optionally, the controller is further configured to determine that the current voltage drop of other battery cells of the second battery module is: and the difference between the currently calculated positive voltage of the battery cell and the currently calculated positive voltage of the other battery cell connected with the negative electrode of the battery cell.
Optionally, the controller determines that the current voltage drop of the second battery cell connected to the positive electrode of the first battery module is: a difference between a fifth voltage of the first end and a sixth voltage of a negative electrode of the second cell.
Optionally, the controller determines that the current voltages of the other electric cores of the first battery module are: the difference between the currently calculated negative electrode voltage of another cell connected to the currently calculated positive electrode of the cell and the currently calculated negative electrode voltage of the cell.
An embodiment of the present invention further provides a cell voltage acquisition method, in which the above-described cell voltage acquisition apparatus is applied, and the method includes:
after receiving a preset time length of a cell voltage acquisition instruction, acquiring current charging/discharging current and voltages acquired by each voltage acquisition circuit;
and determining the current voltage drop of each battery cell according to the charging/discharging current and the voltage acquired by each voltage acquisition circuit.
Optionally, the step of determining the current voltage drop of each battery cell according to the charging/discharging current and the voltage collected by each voltage collecting circuit includes:
and determining the current voltage drop of the first battery cell according to the prestored internal resistance of the copper bar, the prestored first voltage at the first end, the prestored second voltage of the positive electrode of the first battery cell connected with the negative electrode of the second battery module in the second battery module, and the prestored current charging/discharging current.
Optionally, the step of determining, according to the pre-stored internal resistance of the copper bar, the first voltage at the first end, the second voltage at the positive electrode of the first battery cell in the second battery module, which is connected to the negative electrode of the second battery module, and the current charging/discharging current, the current voltage drop of the first battery cell includes:
if the current charging mode is adopted, determining a third voltage of the second end according to the internal resistance, the current charging current and the first voltage; determining a current voltage drop of the first battery cell according to the second voltage and the third voltage; wherein the current voltage drop of the first cell is a difference between the second voltage and the third voltage;
if the current is in the discharging mode, determining a fourth voltage of the second end according to the internal resistance, the current discharging current and the first voltage; determining a current voltage drop of the first battery cell according to the second voltage and the fourth voltage; wherein the current voltage drop of the first cell is the sum of the second voltage and the fourth voltage.
Optionally, the step of determining the current voltage drop of each battery cell according to the charging/discharging current and the voltage collected by each voltage collecting circuit includes: determining the current voltage drop of other cells of the second battery module as: and the difference between the currently calculated positive voltage of the battery cell and the currently calculated positive voltage of the other battery cell connected with the negative electrode of the battery cell.
Optionally, the step of determining the current voltage drop of each battery cell according to the charging/discharging current and the voltage collected by each voltage collecting circuit includes: determining that the current voltage drop of a second battery cell connected with the positive electrode of the first battery module is: a difference between a fifth voltage of the first end and a sixth voltage of a negative electrode of the second cell.
Optionally, the step of determining the current voltage drop of each of the battery cells according to the charging/discharging current and the voltage collected by each of the voltage collecting circuits further includes determining that the current voltages of other battery cells of the first battery module are: the difference between the currently calculated negative electrode voltage of another cell connected to the currently calculated positive electrode of the cell and the currently calculated negative electrode voltage of the cell.
The embodiment of the invention also provides an electric automobile which comprises the battery cell voltage acquisition device.
The technical scheme of the invention at least has the following beneficial effects:
according to the cell voltage acquisition device provided by the embodiment of the invention, the plurality of paths of voltage acquisition circuits are respectively connected with the negative electrodes of the cells in the first battery module, the first end of the copper bar and the positive electrodes of the cells in the second battery module one by one, so that the voltage at the two ends of the copper bar is prevented from being independently acquired, the number of voltage acquisition circuits is reduced, and the voltage acquisition chip is prevented from being damaged due to the negative voltage of the copper bar.
Drawings
Fig. 1 is a schematic diagram of a cell voltage acquisition apparatus according to an embodiment of the present invention.
Description of reference numerals:
the battery pack comprises a U-controller, a 1-voltage acquisition circuit, 21-a first battery module, 21A-a first battery cell, 21B-battery cell, 21C-battery cell, 22-a second battery module, 22A-a second battery cell, 22B-battery cell and 22C-battery cell.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The invention provides a cell voltage acquisition device, a cell voltage acquisition method and an electric automobile, aiming at the problem that a reverse voltage generated on a copper bar in the prior art possibly causes damage of a voltage acquisition circuit, so that the voltage at two ends of the copper bar is prevented from being acquired independently, and the possibility of damage of the voltage acquisition circuit is reduced.
Referring to fig. 1, a schematic diagram of a cell voltage acquisition device according to an embodiment of the present invention is shown, where the cell voltage acquisition device includes:
a controller U;
the multi-path voltage acquisition circuit 1 is connected with the controller U;
each battery module is connected with a plurality of battery cells in series, and a copper bar 3 is connected between every two adjacent battery modules in series;
the first end of the copper bar 3 is connected with the positive electrode of the first battery module 21, and the second end of the copper bar 3 is connected with the negative electrode of the second battery module 22;
the multiple voltage acquisition circuits 1 are respectively connected with the negative electrodes of the battery cells in the first battery module 21, the first end and the positive electrodes of the battery cells in the second battery module 22 one by one;
after receiving a preset time length of a cell voltage acquisition instruction, the controller U acquires a current charging/discharging current and voltages acquired by the voltage acquisition circuits 1, and determines a current voltage drop of each cell according to the charging/discharging current and the voltages acquired by the voltage acquisition circuits 1.
It should be noted that fig. 1 shows an example in which two battery modules are included and three battery cells are connected in series in each battery module, that is, the battery modules include: the first battery module 21 includes a first cell 21A, a cell 21B, and a cell 21C; the second battery module 22 includes a second cell 22A, a cell 22B, and a cell 22C; however, in practical applications, a plurality of battery modules may be further included, and each battery module includes a plurality of battery cells.
In addition, a plurality of the voltage acquisition circuits can be a plurality of voltage input ends of the same voltage acquisition chip, namely: and a plurality of voltage acquisition circuits are integrated on the same voltage acquisition chip.
According to the cell voltage acquisition device provided by the embodiment of the invention, the voltage acquisition circuits are connected with the cathodes of the cells in the first battery module 21, the first end of the copper bar 3 and the anodes of the cells in the second battery module 22 in a one-to-one correspondence manner, so that one voltage acquisition circuit is reduced, the cost is reduced, the voltage at two ends of the copper bar 3 is prevented from being acquired independently, and the voltage acquisition circuits, especially the acquisition chips, caused by the back pressure of the copper bar 3 are effectively prevented from being damaged.
Optionally, when the current voltage drop of each battery cell is determined according to the charge/discharge current and the voltage collected by each voltage collecting circuit 1, the controller U determines the current voltage drop of the first battery cell 22A according to the pre-stored internal resistance of the copper bar 3, the first voltage at the first end, the second voltage of the positive electrode of the first battery cell 22A connected to the negative electrode of the second battery module 22 in the second battery module 22, and the current charge/discharge current.
As can be seen from fig. 1, in the embodiment of the present invention, the second end of the copper bar 3 is connected to the negative electrode of the first electrical core 22A, and in order to reduce the number of voltage acquisition circuits and prevent the reverse voltage of the copper bar 3 from damaging the voltage acquisition circuits, in the embodiment of the present invention, no acquisition point is provided at the second end, and the voltage difference between the voltage at the first end and the positive electrode of the second electrical core 22A is not the current voltage drop of the second electrical core 22A, so that the embodiment of the present invention needs to determine the current voltage drop of the first electrical core 22A according to the first voltage, the second voltage, the internal resistance of the copper bar, and the charge/discharge current.
On one hand, if the current is the charging mode, when determining the current voltage drop of the first battery cell 22A, the controller U determines a third voltage of the second end according to the internal resistance, the current charging current, and the first voltage;
determining a current voltage drop of the first cell 22A according to the second voltage and the third voltage; wherein the current voltage drop of the first cell 22A is a difference between the second voltage and the third voltage.
In the charging process, the current direction is from a low level to a high level, and the voltage at the two ends of the copper bar 3 is left negative and positive, so that the sum of the voltage consumed by the copper bar 3 and the voltage drop at the two ends of the first battery cell 22A is the difference between the voltage at the positive electrode of the first battery cell 22A and the voltage at the first end; that is, the current voltage drop of the first cell 22A is the difference between the second voltage and the third voltage.
On the other hand, if the current is the discharging mode, when determining the current voltage drop of the first battery cell 22A, the controller U determines a fourth voltage of the second end according to the internal resistance, the current discharging current, and the first voltage;
determining a current voltage drop of the first cell 22A according to the second voltage and the fourth voltage; wherein the current voltage drop of the first cell 22A is the sum of the second voltage and the fourth voltage.
In the discharging process, the direction of the current flows from a high level to a low level, and the voltage at the two ends of the copper bar 3 is positive left, positive right, negative left, so that the current break of the first battery cell 22A is the sum of the second voltage and the fourth voltage.
Optionally, when determining the current voltage drop of another electric core in the second battery module 22, the controller U is configured to determine a difference between the currently calculated positive voltage of the electric core and the currently calculated positive voltage of another electric core connected to the negative electrode of the electric core.
Optionally, when determining a current voltage drop of a second battery cell 21A of the first battery module 21 connected to the positive electrode of the first battery module 21, the controller U is configured to determine a difference between a fifth voltage of the first end and a sixth voltage of the negative electrode of the second battery cell 21A.
Optionally, when determining the current voltage drop of other electric cores in the first battery module 21, the controller U is configured to determine that the current voltage drop of the electric core calculated currently is: the difference between the currently calculated negative electrode voltage of another cell connected to the currently calculated positive electrode of the cell and the currently calculated negative electrode voltage of the cell.
When the current voltage drop of each battery cell is determined, the chip of the voltage acquisition circuit is damaged due to the reverse voltage generated in the charging process of the battery by the copper bar 3, so that the voltage at two ends of the copper bar 3 is not acquired independently, and the copper bar 3 and the second battery cell 22A in the second battery module are used as a whole to acquire the voltage, thereby reducing the number of the voltage acquisition circuits and avoiding the damage of the voltage acquisition circuits. In order to improve the accuracy of voltage acquisition, the embodiment of the invention further determines the voltage at the two ends of the copper bar according to the internal resistance and the charging/discharging current of the copper bar 3, and finally accurately determines the current voltage drop at the two ends of the second electrical core 22A according to the voltage value of the positive electrode of the second electrical core 22A and the voltage at the two ends of the copper bar 3.
An embodiment of the present invention further provides a cell voltage acquisition method, in which the above-described cell voltage acquisition apparatus is applied, and the method includes:
after receiving a preset time length of a cell voltage acquisition instruction, acquiring current charging/discharging current and voltages acquired by each voltage acquisition circuit;
and determining the current voltage drop of each battery cell according to the charging/discharging current and the voltage acquired by each voltage acquisition circuit.
Optionally, the step of determining the current voltage drop of each battery cell according to the charging/discharging current and the voltage collected by each voltage collecting circuit includes:
and determining the current voltage drop of the first battery cell according to the prestored internal resistance of the copper bar, the prestored first voltage at the first end, the prestored second voltage of the positive electrode of the first battery cell connected with the negative electrode of the second battery module in the second battery module, and the prestored current charging/discharging current.
Optionally, the step of determining, according to the pre-stored internal resistance of the copper bar, the first voltage at the first end, the second voltage at the positive electrode of the first battery cell in the second battery module, which is connected to the negative electrode of the second battery module, and the current charging/discharging current, the current voltage drop of the first battery cell includes:
if the current charging mode is adopted, determining a third voltage of the second end according to the internal resistance, the current charging current and the first voltage; determining a current voltage drop of the first battery cell according to the second voltage and the third voltage; wherein the current voltage drop of the first cell is a difference between the second voltage and the third voltage;
if the current is in the discharging mode, determining a fourth voltage of the second end according to the internal resistance, the current discharging current and the first voltage; determining a current voltage drop of the first battery cell according to the second voltage and the fourth voltage; wherein the current voltage drop of the first cell is the sum of the second voltage and the fourth voltage.
Optionally, the step of determining the current voltage drop of each battery cell according to the charging/discharging current and the voltage collected by each voltage collecting circuit includes: determining the current voltage drop of other cells of the second battery module as: and the difference between the currently calculated positive voltage of the battery cell and the currently calculated positive voltage of the other battery cell connected with the negative electrode of the battery cell.
Optionally, the step of determining the current voltage drop of each battery cell according to the charging/discharging current and the voltage collected by each voltage collecting circuit includes: determining that the current voltage drop of a second battery cell connected with the positive electrode of the first battery module is: a difference between a fifth voltage of the first end and a sixth voltage of a negative electrode of the second cell.
Optionally, the step of determining the current voltage drop of each of the battery cells according to the charging/discharging current and the voltage collected by each of the voltage collecting circuits further includes determining that the current voltages of other battery cells of the first battery module are: the difference between the currently calculated negative electrode voltage of another cell connected to the currently calculated positive electrode of the cell and the currently calculated negative electrode voltage of the cell.
The embodiment of the invention also provides an electric automobile which comprises the battery cell voltage acquisition device.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. The utility model provides a cell voltage collection system which characterized in that includes:
a controller (U);
the multi-channel voltage acquisition circuit (1) is connected with the controller (U);
each battery module is connected with a plurality of battery cells in series, and a copper bar (3) is connected between every two adjacent battery modules in series;
the first end of the copper bar (3) is connected with the positive electrode of a first battery module (21), and the second end of the copper bar (3) is connected with the negative electrode of a second battery module (22);
the voltage acquisition circuits (1) are respectively connected with the negative electrode of each battery cell in the first battery module (21), the first end and the positive electrode of each battery cell in the second battery module (22) one by one;
the controller (U) acquires the current charging/discharging current and the voltage acquired by each voltage acquisition circuit (1) after receiving the preset time length of the cell voltage acquisition instruction, and determines the current voltage drop of each cell according to the charging/discharging current and the voltage acquired by each voltage acquisition circuit (1).
2. The cell voltage acquisition device according to claim 1, wherein when determining the current voltage drop of each of the cells according to the charge/discharge current and the voltage acquired by each of the voltage acquisition circuits (1), the controller (U) determines the current voltage drop of the first cell (22A) according to a pre-stored internal resistance of the copper bar (3), a first voltage at the first end, a second voltage at an anode of a first cell (22A) connected to a cathode of the second battery module (22) in the second battery module (22), and the current charge/discharge current.
3. The cell voltage acquisition device according to claim 2, wherein if the current mode is the charging mode, when determining the current voltage drop of the first cell (22A), the controller (U) determines a third voltage at the second end according to the internal resistance, the current charging current, and the first voltage;
determining a current voltage drop of the first cell (22A) from the second voltage and the third voltage; wherein the current voltage drop of the first cell (22A) is the difference between the second voltage and the third voltage.
4. The cell voltage acquisition device according to claim 2, wherein if the current mode is the discharging mode, when determining the current voltage drop of the first cell (22A), the controller (U) determines a fourth voltage at the second end according to the internal resistance, the current discharging current and the first voltage;
determining a current voltage drop of the first cell (22A) from the second voltage and the fourth voltage; wherein the current voltage drop of the first cell (22A) is the sum of the second voltage and the fourth voltage.
5. The cell voltage acquisition device according to claim 2, wherein the controller (U) is further configured to determine the current voltage drop of other cells of the second battery module (22) as: and the difference between the currently calculated positive voltage of the battery cell and the currently calculated positive voltage of the other battery cell connected with the negative electrode of the battery cell.
6. The cell voltage acquisition device according to claim 1, wherein the controller (U) determines that the current voltage drop of a second cell (21A) connected to the positive electrode of the first battery module (21) is: a difference between a fifth voltage of the first terminal and a sixth voltage of a negative electrode of the second cell (21A).
7. The cell voltage acquisition device according to claim 6, wherein the controller (U) determines the current voltages of the other cells of the first battery module (21) to be: the difference between the currently calculated negative electrode voltage of another cell connected to the currently calculated positive electrode of the cell and the currently calculated negative electrode voltage of the cell.
8. A cell voltage acquisition method using the cell voltage acquisition apparatus according to any one of claims 1 to 7, the method comprising:
after receiving a preset time length of a cell voltage acquisition instruction, acquiring current charging/discharging current and voltages acquired by each voltage acquisition circuit;
and determining the current voltage drop of each battery cell according to the charging/discharging current and the voltage acquired by each voltage acquisition circuit.
9. The cell voltage acquisition method according to claim 8, wherein the step of determining the current voltage drop of each of the cells according to the charge/discharge current and the voltage acquired by each of the voltage acquisition circuits comprises:
and determining the current voltage drop of the first battery cell according to the prestored internal resistance of the copper bar, the prestored first voltage at the first end, the prestored second voltage of the positive electrode of the first battery cell connected with the negative electrode of the second battery module in the second battery module, and the prestored current charging/discharging current.
10. An electric vehicle, characterized by comprising the cell voltage acquisition apparatus according to any one of claims 1 to 7.
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| CN201911165828.1A CN112952217A (en) | 2019-11-25 | 2019-11-25 | Battery cell voltage acquisition device and method and electric automobile |
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| CN201911165828.1A CN112952217A (en) | 2019-11-25 | 2019-11-25 | Battery cell voltage acquisition device and method and electric automobile |
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| CN114200331A (en) * | 2021-12-06 | 2022-03-18 | 广州小鹏汽车科技有限公司 | Vehicle battery detection method and device, vehicle and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114200331A (en) * | 2021-12-06 | 2022-03-18 | 广州小鹏汽车科技有限公司 | Vehicle battery detection method and device, vehicle and storage medium |
| CN114200331B (en) * | 2021-12-06 | 2023-09-12 | 广州小鹏汽车科技有限公司 | Method and device for detecting vehicle battery, vehicle and storage medium |
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