CN108896929B - Method for measuring cell voltage of battery pack - Google Patents
Method for measuring cell voltage of battery pack Download PDFInfo
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- CN108896929B CN108896929B CN201810831919.3A CN201810831919A CN108896929B CN 108896929 B CN108896929 B CN 108896929B CN 201810831919 A CN201810831919 A CN 201810831919A CN 108896929 B CN108896929 B CN 108896929B
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 claims description 32
- 239000000178 monomer Substances 0.000 claims description 15
- 239000003381 stabilizer Substances 0.000 claims description 6
- 238000005259 measurement Methods 0.000 abstract description 10
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
- G01R19/2509—Details concerning sampling, digitizing or waveform capturing
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Abstract
The invention provides a method for measuring the voltage of a single battery pack, and belongs to the technical field of voltage measurement. The method comprises the following steps: presetting a circuit for measuring the voltage of a single battery pack; controlling the first controllable switch to be opened and the second controllable switch to be closed; acquiring a first cell voltage of each cell through the voltage sensor; controlling the first controllable switch to be closed and the second controllable switch to be opened; acquiring a second cell voltage of each cell through the voltage sensor; and calculating the real cell voltage of each single cell according to the first cell voltage and the second cell voltage. The method can solve the problem of overlarge measurement error of the single voltage of the battery pack in the prior art.
Description
Technical Field
The invention relates to the technical field of voltage measurement, in particular to a method for measuring the cell voltage of a battery pack.
Background
The measurement of the cell voltage is an important function of a Battery Management System (BMS), the BMS performs a determination on Battery states such as a Battery System equalization turn-on, an overcharge and an overdischarge through the cell voltage of the Battery pack, and the cell voltage is an important parameter for SOC (State of Charge) estimation. Due to the existence of the single voltage acquisition line resistor, when a large current passes through the acquisition line, the accuracy of single voltage acquisition is affected. At present BMS monomer voltage acquisition circuit often gets the electricity from battery module both ends, can have great electric current in the actual work in-process on the collection line of first festival and end section battery, gathers the monomer voltage of first festival battery and end section battery and produces the influence. One method is to directly lead out wires from the positive electrode and the negative electrode of the battery pack to supply power for the acquisition circuit, but the cost of the wire harness is increased, and the wire harness is difficult to arrange.
Disclosure of Invention
The invention aims to provide a method for measuring the cell voltage of a battery pack, which can solve the problem of overlarge cell voltage measurement error of the battery pack in the prior art.
In order to achieve the above object, the present invention provides a method for measuring a cell voltage of a battery pack including a plurality of cells connected in series, the method may include:
presetting a circuit for measuring cell voltages of a battery pack, the circuit comprising:
the detection lines are respectively connected to two ends of each single battery of the battery pack;
the detection contacts are respectively connected with two ends of each single battery through the detection circuit;
a multiplexer connected to each of the detection contacts;
the first end of the analog-to-digital converter is connected with the multiplexer and used for converting the analog signal of the multiplexer into a digital signal;
the voltage sensor is connected with the second end of the analog-to-digital converter and used for respectively detecting the single voltage of each single battery through the multiplexer;
one end of the linear voltage stabilizer is connected with the third end of the analog-to-digital converter, and the fourth end of the analog-to-digital converter is connected with one detection contact in the plurality of detection contacts;
a first diode having an anode connected to another one of the plurality of sense contacts;
one end of the first controllable switch is connected with the negative electrode of the first diode, and the other end of the first controllable switch is connected with the other end of the linear voltage stabilizer;
a second diode having an anode connected to a further one of the plurality of sensing contacts;
one end of the second controllable switch is connected with the cathode of the second diode, and the other end of the second controllable switch is connected with the other end of the linear voltage stabilizer;
controlling the first controllable switch to be opened and the second controllable switch to be closed;
acquiring a first cell voltage of each cell through the voltage sensor;
controlling the first controllable switch to be closed and the second controllable switch to be opened;
acquiring a second cell voltage of each cell through the voltage sensor;
and calculating the real cell voltage of each single cell according to the first cell voltage and the second cell voltage.
Optionally, at least one current limiting resistor is connected between the multiplexer and each of the sensing contacts.
Optionally, the one detection contact is the detection contact connected to the negative electrode of the single battery with the number 1 in the battery pack.
Optionally, the another detection contact is the detection contact connected to the positive electrode of the single battery with the number n in the battery pack, where n is the number of the single batteries in the battery pack.
Optionally, the one more detection contact is the detection contact connected with the positive electrode of the single battery with the number n-2 in the battery pack.
Optionally, the calculating a cell real voltage of each of the unit cells according to the first cell voltage and the second cell voltage includes:
calculating a cell true voltage of the unit cell according to formula (1),
wherein, VxIs the cell true voltage, V, of the cell numbered x1nIs the first cell voltage, V, of the cell numbered n2nIs the second cell voltage, V, of the cell numbered n2xThe second cell voltage of the cell numbered x.
Through the technical scheme, the method for measuring the monomer voltage of the battery pack can calculate the monomer real voltage of the monomer voltage of the battery pack by adding the power supply line connected to the other monomer battery in the acquisition circuit and controlling the on-off of the two power supply lines, solves the problem of overlarge monomer voltage measurement error of the battery pack in the prior art, and improves the measurement precision of the monomer voltage of the battery pack.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a flowchart of a method for measuring a cell voltage of a battery pack according to an embodiment of the present invention;
fig. 2 is a block diagram of a circuit for measuring a cell voltage of a battery pack according to an embodiment of the present invention.
Description of the reference numerals
A. Detecting contact RL, line resistance
RS, current limiting resistor U1 and multiplexer
U2, linear voltage regulator U3, analog-to-digital converter
K1, a first controllable switch K2, a second controllable switch
D1, a first diode D2, and a second diode
01. Controller 02, voltage sensor
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Fig. 1 is a flowchart illustrating a method for measuring a cell voltage of a battery pack according to an embodiment of the present invention. In this embodiment, the battery pack may include a plurality of unit cells (C shown in fig. 2) connected in series1～Cn). In fig. 1, the method may include:
in step S1, a circuit for measuring the cell voltage of the battery pack is preset. As shown in fig. 2, the circuit may include: the circuit comprises a detection circuit, a plurality of detection contacts A, a multiplexer U1, an analog-digital converter U3, a voltage sensor 02, a linear voltage regulator U2, a first diode D1, a first controllable switch K1, a second diode D2 and a second controllable switch K2.
The detection lines may be connected to both ends of each unit cell of the battery pack, respectively. As shown in fig. 2, since the detection lines connected to both ends of each cell are relatively long, the line resistance RL is relatively large, and the influence on the value of the cell voltage is also large during detection.
The plurality of detection contacts A can be respectively connected with two ends of each single battery through detection lines.
A multiplexer U1 may be connected to each sense contact a separately. The multiplexer U1 can be used to control the make and break of the connection between each sensing contact a and the voltage sensor 02. In addition, to save on the design cost of the circuit, the multiplexer U1 may be powered by a battery pack (the power interface may be, for example, the 1, 2 ports of the multiplexer U1 in fig. 2).
A first terminal of the analog-to-digital converter U3 may be connected to the multiplexer U1. The analog-to-digital converter U3 may be used to convert the analog signal of the multiplexer U1 to a digital signal. The voltage sensor 02 may be connected to a second terminal of the analog-to-digital converter U3 for detecting the cell voltage of each cell through the multiplexer U1, respectively. One terminal of a linear regulator U2 for stabilizing voltage fluctuations in the line may be connected to the third terminal of the analog-to-digital converter U3, and the fourth terminal of the analog-to-digital converter U3 is connected to one of the plurality of detection contacts a. The analog-to-digital converter U3 may be powered, for example, by a battery pack (the power supply may be, for example, the 3, 4 interface of the analog-to-digital converter U3 in fig. 2). In one example of the invention, the one detection contact a may be, for example, numbered 1 (C) as shown in fig. 21) The negative electrodes of the unit cells of (2) are connected.
The anode of the first diode D1 may be connected to another one of the plurality of sensing contacts a. In one example of the invention, the further detection contact a may be, for example, numbered n (C) as shown in fig. 2n) The positive electrodes of the single batteries are connected. One end of the first controllable switch K1 is connected to the cathode of the first diode D1, and the other end of the first controllable switch K1 is connected to the other end of the linear regulator U2.
The anode of the second diode D2 may be connected to yet another one of the plurality of sensing contacts a. In one example of the invention, the further detection contact A may be, for example, numbered n-2 (C) as shown in FIG. 2n-2) The positive electrodes of the single batteries are connected. One end of the second controllable switch K2 is connected to the cathode of the second diode D2, and the other end of the second controllable switch K2 is connected to the other end of the linear regulator U2.
In step S2, the first controllable switch K1 is controlled to be open and the second controllable switch K2 is controlled to be closed. In this embodiment, the controller 01 may be provided, for example, on the periphery of the circuit for measuring the cell voltage of the battery pack. The controller 01 can be connected with the control ends of the first controllable switch K1 and the second controllable switch K2, so that on-off control of the first controllable switch K1 and the second controllable switch K2 is realized. When the controller 01 controls the first controllable switch K1 to be switched off and the second controllable switch K2 to be switched on, the battery pack supplies power to the multiplexer U1, the linear voltage regulator U2 and the analog-to-digital converter U3 through the second diode D2 and the second controllable switch K2.
In step S3, a first cell voltage of each cell is acquired by the voltage sensor 02. In this embodiment, the controller 01 may also be connected to a voltage sensor 02 for acquiring the cell voltage of each cell through the voltage sensor 02. When the controller 01 acquires the first cell voltage of each cell through the voltage sensor 02, the cell (C) numbered 11) For example, the controller 02 controls the multiplexer U1 such that the voltage sensor 02 is connected to both ends of the cell numbered 1, thereby enabling detection of the first cell voltage of the cell numbered 1. The controller 02 obtains the cell (C) numbered 2 from the voltage sensor 022) At the first cell voltage of (2), the controller 02 controls the multiplexer U1 to disconnect the voltage sensor 02 from the cell numbered 1, and controls the multiplexer U1 to connect the voltage sensor 02 to both ends of the cell numbered 2, so that the voltage sensor 02 detects the voltage of the cell numbered 2. In the above operation manner, the controller 01 obtains the first cell voltage of each cell of the battery pack through the voltage sensor 02, respectively. As shown in FIG. 2, the number n-2 (C) is detected due to the presence of the line resistance RLn-2) The first cell voltage of the cell (C) is higher than the first cell voltage, so that the serial number is n-2 (C)n-2) The first cell voltage of the cell of (1) can be regarded as V1n-2＝Vn-2+ Δ V, wherein V1n-2Is the first measured cell voltage of the cell numbered n-2, n is the total number of cells of the battery, Vn-2The cell true voltage of the cell numbered n-2. For the rest of the single batteries, all are V1x＝VxWherein V is1xFor the first measured cell voltage, V, of the cell numbered xxThe cell true voltage of the cell numbered x.
In step S4, the first controllable switch K1 is controlled to be closed and the second controllable switch K2 is controlled to be open.
In step S5, the second cell voltage of each cell is acquired by the voltage sensor 02. In this embodiment, as shown in fig. 2, the number n (C) is detected due to the presence of the line resistance RLn) The first cell voltage of the cell (C) is higher than the first cell voltage, so that the number n (C) is the numbern) The first cell voltage of the cell of (1) can be regarded as V2n＝Vn+ Δ V, wherein V2nFor the measured first cell voltage, V, of the cell numbered nnThe cell true voltage of the cell numbered n. For the rest of the single batteries, all are V2x＝VxWherein V is2xFor the first measured cell voltage, V, of the cell numbered xxThe cell true voltage of the cell numbered x.
In step S6, a cell true voltage of each cell is calculated from the first cell voltage and the second cell voltage. In this embodiment, the cell true voltage of the unit cell may be calculated according to formula (1),
wherein, VxIs the cell true voltage, V, of the cell numbered x1nIs the first cell voltage, V, of the cell numbered n2nA second cell voltage, V, of the cell numbered n2xThe second cell voltage of the cell numbered x.
In one embodiment of the present invention, at least one current limiting resistor RS may be connected between the multiplexer U1 and each sensing contact a in order to protect the various devices in the circuit during sensing of the cell voltage of the battery pack. The resistance of the current limiting resistor RS may be changed according to the voltage of the battery pack to be detected, and therefore, the selection of the resistance of the current limiting resistor RS may be known by those skilled in the art, and will not be described herein.
Another aspect of the present invention also provides a circuit for measuring a cell voltage of a battery pack, which may include a circuit as shown in fig. 2 and control the circuit to perform measurement of the cell voltage of the battery pack using a method as shown in fig. 1. In addition, in the circuit, the controller 01 may adopt a Micro Control Unit (MCU).
According to the technical scheme, the method and the circuit for measuring the monomer voltage of the battery pack can calculate the monomer real voltage of the monomer voltage of the battery pack by adding the power supply line connected to the other monomer battery in the acquisition circuit and controlling the on-off of the two power supply lines, so that the problem of overlarge monomer voltage measurement error of the battery pack in the prior art is solved, and the measurement precision of the monomer voltage of the battery pack is improved.
While the invention has been described in detail with reference to the drawings, the invention is not limited to the details of the above-described alternative embodiments, and various simple modifications can be made to the technical solution of the invention within the technical idea of the invention, and the simple modifications are within the protective scope of the invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention will not be described separately for the various possible combinations.
Those skilled in the art can understand that all or part of the steps in the foregoing embodiments may be implemented by a program to instruct related hardware, where the program is stored in a storage medium and includes several instructions to enable a (which may be a single chip, a chip, etc.) or a processor (processor) to execute all or part of the steps of the methods in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as disclosed in the embodiments of the present invention as long as it does not depart from the spirit of the embodiments of the present invention.
Claims (3)
1. A method for measuring cell voltages of a battery pack comprising a plurality of cells connected in series, the method comprising:
presetting a circuit for measuring cell voltages of a battery pack, the circuit comprising:
the detection lines are respectively connected to two ends of each single battery of the battery pack;
the detection contacts are respectively connected with two ends of each single battery through the detection circuit;
a multiplexer connected to each of the detection contacts;
the first end of the analog-to-digital converter is connected with the multiplexer and used for converting the analog signal of the multiplexer into a digital signal;
the voltage sensor is connected with the second end of the analog-to-digital converter and used for respectively detecting the single voltage of each single battery through the multiplexer;
one end of the linear voltage stabilizer is connected with the third end of the analog-to-digital converter, and the fourth end of the analog-to-digital converter is connected with one detection contact in the plurality of detection contacts;
a first diode having an anode connected to another one of the plurality of sense contacts;
one end of the first controllable switch is connected with the negative electrode of the first diode, and the other end of the first controllable switch is connected with the other end of the linear voltage stabilizer;
a second diode having an anode connected to a further one of the plurality of sensing contacts;
one end of the second controllable switch is connected with the cathode of the second diode, and the other end of the second controllable switch is connected with the other end of the linear voltage stabilizer;
controlling the first controllable switch to be opened and the second controllable switch to be closed;
acquiring a first cell voltage of each cell through the voltage sensor;
controlling the first controllable switch to be closed and the second controllable switch to be opened;
acquiring a second cell voltage of each cell through the voltage sensor;
calculating a cell real voltage of each of the single batteries according to the first cell voltage and the second cell voltage;
the detection contact is connected with the negative electrode of the single battery with the number of 1 in the battery pack;
the other detection contact is connected with the anode of the single battery with the number n in the battery pack, wherein n is the number of the single batteries in the battery pack;
the calculating of the cell real voltage of each of the unit cells according to the first cell voltage and the second cell voltage includes:
calculating a cell true voltage of the unit cell according to formula (1),
wherein, VxIs the cell true voltage, V, of the cell numbered x1nIs the first cell voltage, V, of the cell numbered n2nThe monomer is numbered nThe second cell voltage, V, of the battery2xThe second cell voltage of the cell numbered x.
2. The method of claim 1, wherein at least one current limiting resistor is connected between the multiplexer and each of the sensing contacts.
3. The method of claim 2, wherein the further one of the sensing contacts is the sensing contact connected to the positive pole of the cell numbered n-2 in the battery pack.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810831919.3A CN108896929B (en) | 2018-07-26 | 2018-07-26 | Method for measuring cell voltage of battery pack |
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| CN201810831919.3A CN108896929B (en) | 2018-07-26 | 2018-07-26 | Method for measuring cell voltage of battery pack |
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| CN108896929B true CN108896929B (en) | 2021-10-22 |
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Denomination of invention: Method for measuring cell voltage of battery pack Effective date of registration: 20220506 Granted publication date: 20211022 Pledgee: China Construction Bank Corporation Hefei Shushan sub branch Pledgor: ANHUI RNTEC TECHNOLOGY Co.,Ltd. Registration number: Y2022980004761 |
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