CN113296013B - Support monomer voltage acquisition circuit of arbitrary section battery series connection - Google Patents
Support monomer voltage acquisition circuit of arbitrary section battery series connection Download PDFInfo
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- CN113296013B CN113296013B CN202110569813.2A CN202110569813A CN113296013B CN 113296013 B CN113296013 B CN 113296013B CN 202110569813 A CN202110569813 A CN 202110569813A CN 113296013 B CN113296013 B CN 113296013B
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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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- 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
- G01R31/36—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
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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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Abstract
A cell voltage acquisition circuit supporting series connection of any battery comprises: the battery, N voltage mapping circuit, multiplexer, AD converter and CPU that N series arrangement, wherein, N voltage mapping circuit and N the battery one-to-one is parallelly connected, N voltage mapping circuit with the multiplexer is established ties, AD converter's first end with the multiplexer is connected and the second end with the first end of CPU is connected, the second end of CPU with the multiplexer is connected. The application provides a support monomer voltage acquisition circuit of arbitrary section battery series connection has following beneficial effect: the voltage acquisition of any battery monomer after being connected in series can be supported, and the modularized characteristic is achieved; the invention collects the battery voltage after mapping without a resistor voltage-dividing circuit, the sampling precision of each battery voltage is not influenced by the serial number of the batteries, and devices such as a multiplexer, an analog-digital converter and the like do not bear the risk of high voltage.
Description
Technical Field
The invention belongs to the technical field of battery management, and particularly relates to a single voltage acquisition circuit supporting serial connection of any batteries.
Background
In the fields of space power sources, energy storage, electric vehicles and the like, a plurality of battery monomers are required to be connected in series and parallel to form a battery pack, and in order to better manage the battery, the voltage of each battery monomer participating in series connection needs to be acquired. The voltage of each battery cell in the battery pack has the characteristic of high common mode, the output voltage can reach dozens or hundreds of volts, the analog-to-digital converter cannot be used for acquisition directly, and a special acquisition circuit needs to be designed.
Disclosure of Invention
In order to solve the above problems, the present invention provides a single voltage collecting circuit supporting any battery in series, including: the battery, N voltage mapping circuit, multiplexer, AD converter and CPU that N series arrangement, wherein, N voltage mapping circuit and N the battery one-to-one is parallelly connected, N voltage mapping circuit with the multiplexer is established ties, AD converter's first end with the multiplexer is connected and the second end with the first end of CPU is connected, the second end of CPU with the multiplexer is connected.
Preferably, the voltage mapping circuit includes: the circuit comprises a resistor R1, a capacitor C2, a voltage stabilizing diode D1, a field effect tube Q1 and a transformer, wherein a first end of the capacitor C1 is connected with a CLK end, a second end of the capacitor C1 is respectively connected with a first end of the resistor R1, a cathode of the voltage stabilizing diode D1 and a base electrode of the field effect tube Q1, a second end of the resistor R1, a first end of the capacitor C2, an anode of the voltage stabilizing diode D1 and an emitting electrode of the field effect tube Q1 are connected with a negative electrode corresponding to a battery, an anode of the battery is connected with a first end of a primary coil in the transformer, a second end of the primary coil is respectively connected with a second end of the capacitor C2 and a collecting electrode of the field effect tube Q1, a first end of a secondary coil in the transformer is connected with the multiplexer, and a second end of the secondary coil is grounded.
Preferably, the expression of the sampled voltage of the non-two-end battery cell is as follows:
V SAMPi ＝Vin i+ -Vin i- -I×(Rmosi+RLia) i≠1,i≠N；
wherein, V SAMPi Indicating the sampled voltage, V, of the ith cell in+ Indicates the positive voltage, V, of the ith cell in- Indicating the negative voltage of the ith battery, I indicating the current in the primary side loop at the sampling time, R mosi Denotes the on-resistance, R, of the field effect transistor Liai Representing the parasitic resistance of the primary side of the transformer.
Preferably, the expression of the sampled voltage of the battery cells at the two ends is:
V SAMPi ＝Vin i+ -Vin i- -I×(Rx+Rmosi+RLia) i＝1,i＝N；
wherein, V SAMPi Indicating the sampled voltage, V, of the ith cell in+ Indicating the ith batteryPositive electrode voltage of V in- Indicating the negative voltage of the ith battery, I indicating the current in the primary side loop at the sampling time, R x Representing the parasitic impedance, R, of the primary side circuit to the battery connection mosi On-resistance of field effect transistor, R Liai Representing the parasitic resistance of the primary side of the transformer.
The application provides a support monomer voltage acquisition circuit of arbitrary section battery series connection has following beneficial effect:
(1) The circuit provided by the invention can support the voltage acquisition of any battery monomer after being connected in series, and has the characteristic of modularization;
(2) The battery voltage is acquired after being mapped, a resistance voltage division circuit is not needed, the sampling precision of each battery voltage is not influenced by the serial number of the batteries, and devices such as a multiplexer, an analog-digital converter and the like do not bear high voltage risk;
(3) The single voltage acquisition circuit can form an active equalization circuit for the battery pack through simple expansion, and the operation of the equalization circuit can autonomously transfer energy from a high-voltage battery to a low-voltage battery;
(4) Considering the factors such as the internal resistance (generally dozens of milliohms or more) of a cable connecting the battery and the acquisition board, the conduction internal resistance of the MOS tube and the like, the invention provides a compensation calculation formula for measuring the single voltage of the battery, and the compensation calculation formula for the battery at the topmost end and the bottommost end is slightly different from the compensation calculation formula for the battery at other positions;
a plurality of MOS tubes at different levels in the circuit are driven by adopting a capacitance blocking method, the grid drive signal level of the MOS tubes can be automatically adjusted according to the source voltage of the MOS tubes, a large number of drive chips can be saved, and meanwhile, the grid source voltage is protected by utilizing a voltage stabilizing tube, so that the safety of the MOS tubes is ensured.
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, and 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 these drawings without creative efforts.
FIG. 1 is an overall schematic diagram of a single voltage acquisition circuit supporting the series connection of any battery provided by the present invention;
FIG. 2 is a schematic diagram of a voltage mapping circuit in a single voltage acquisition circuit supporting the series connection of any battery according to the present invention;
FIG. 3 is an equivalent circuit diagram of a single voltage acquisition circuit supporting any battery in series connection, which is provided by the invention, with parasitic resistance taken into account;
fig. 4 is a waveform diagram of a secondary side of a transformer in a single voltage acquisition circuit supporting any battery in series connection provided by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
Referring to fig. 1 to 4, in the embodiments of the present application, the present invention provides a cell voltage acquisition circuit supporting series connection of any battery, including: the battery, N voltage mapping circuit, multiplexer, AD converter and CPU that N series arrangement, wherein, N voltage mapping circuit and N the battery one-to-one is parallelly connected, N voltage mapping circuit with the multiplexer is established ties, AD converter's first end with the multiplexer is connected and the second end with the first end of CPU is connected, the second end of CPU with the multiplexer is connected.
In the embodiment of the application, the single voltage acquisition circuit supporting the serial connection of any battery can support the serial connection of any battery, the core circuit is a voltage mapping circuit, the circuit utilizes a transformer to map the voltage of each battery to a uniform level, and the high common mode characteristic of the original single voltage is removed, so that the voltage of a plurality of battery monomers can be directly acquired by a multiplexer and an analog-to-digital converter conveniently, the circuit topology has the characteristic of modularization, and the number of the voltage mapping circuits can be increased or decreased only according to the number of the serial-connection sections of the battery; the acquisition error of the circuit to the single battery voltage is less than 3mV, and the requirement of most battery management systems can be met.
In the embodiment of the present application, the overall scheme of the acquisition circuit is shown in fig. 1. In the figure, cell1, cell2, 8230, cell N and Cell N are battery cells with N sections connected in series, the voltages of the Cell cells are mapped into a voltage value with a uniform level through a voltage mapping circuit, only the voltage of the Cell is mapped, and the voltages of a plurality of battery cells can be acquired by using one AD converter after passing through an analog multiplexer.
As shown in fig. 1 to 4, in the embodiment of the present application, the voltage mapping circuit includes: the circuit comprises a resistor R1, a capacitor C2, a voltage stabilizing diode D1, a field effect tube Q1 and a transformer, wherein a first end of the capacitor C1 is connected with a CLK end, a second end of the capacitor C1 is respectively connected with a first end of the resistor R1, a cathode of the voltage stabilizing diode D1 and a base electrode of the field effect tube Q1, a second end of the resistor R1, a first end of the capacitor C2, an anode of the voltage stabilizing diode D1 and an emitting electrode of the field effect tube Q1 are connected with a negative electrode corresponding to a battery, an anode of the battery is connected with a first end of a primary coil in the transformer, a second end of the primary coil is respectively connected with a second end of the capacitor C2 and a collecting electrode of the field effect tube Q1, a first end of a secondary coil in the transformer is connected with the multiplexer, and a second end of the secondary coil is grounded.
In the embodiment of the present application, a schematic diagram of a voltage mapping circuit is shown in fig. 2, and italics in the diagram represent names of circuit networks. When the clock CLK (square wave with 50% duty cycle) is turned on, all the cells in the battery pack are mapped to the secondary winding of the transformer through the transformer. The whole circuit works under the drive of a unified clock CLK, a capacitor C1 and a resistor R1 are added in a drive circuit of an MOS tube grid electrode, so that grid voltage can change along with the source electrode of the MOS tube, a square wave signal of the CLK can be transmitted to the grid electrode, and meanwhile, the grid source voltage is protected by a voltage stabilizing diode D1, and the MOS tube is prevented from being damaged.
Fig. 3 is a diagram in which the parasitic resistance (Rx-i) of the connection of the battery and the battery sampling circuit is taken into account, and the resistances (RLa-i, RLb-i) of the transformer windings and the resistance (Rmos-i) of the conduction of the MOS transistor are taken into account. In the connecting lines corresponding to the battery monomers at the non-two ends, currents in the two adjacent loops can be mutually offset, so that the influence of a cable parasitic resistor on the voltage sampling of the battery monomers at the non-two ends is small, the sampling precision is basically only influenced by the conducting resistor Rmos-i and the inductance parasitic resistor RLa-i of the MOS tube, and the expression of the sampling voltage is as follows:
V SAMPi ＝Vin i+ -Vin i- -I×(Rmosi+RLia) i≠1,i≠N；
wherein, V SAMPi Indicating the sampled voltage, V, of the ith cell in+ Indicates the positive voltage, V, of the ith cell in- Indicating the negative voltage of the ith battery, I indicating the current in the primary side loop at the sampling time, R m o si Denotes the on-resistance, R, of the field effect transistor Liai Representing the parasitic resistance of the primary side of the transformer.
The current on the parasitic impedance of a group of cables in the loop of the batteries at two ends of the battery pack cannot be offset with the adjacent single battery, so the expression of the sampling voltage is as follows:
V SAMPi ＝Vin i+ -Vin i- -I×(Rx+Rmosi+RLia) i＝1,i＝N；
wherein, V SAMPi Indicating the sampled voltage, V, of the ith cell in+ Indicates the positive voltage, V, of the ith cell in- Indicating the negative voltage of the ith battery, I indicating the current in the primary side loop at the sampling time, R x Representing the parasitic impedance, R, of the primary side circuit to the battery connection mosi On-resistance of field effect transistor, R Liai Representing the parasitic resistance of the primary side of the transformer. .
Fig. 4 shows a set of verification results for the circuit, and the voltages of three cells are set to Vcell1=3.6v, vcell2=3.7v, vcell3=3.8v, respectively. The obtained waveforms at the secondary coil nodes (Vout 1, vout2, vout 3) of the transformer are shown in fig. 4, and the obtained mapped battery voltages are Vout1=3.5997v, vout2=3.6995v, vout3=3.7993v, and the error between the voltages and the battery itself is less than 1mV.
The application provides a support monomer voltage acquisition circuit of arbitrary section battery series connection has following beneficial effect:
(1) The circuit provided by the invention can support the voltage acquisition of any battery monomer after being connected in series, and has the characteristic of modularization;
(2) According to the invention, the battery voltage is acquired after being mapped, a resistance voltage division circuit is not needed, the sampling precision of each battery voltage is not influenced by the number of batteries connected in series, and devices such as a multiplexer and an analog-to-digital converter are not subjected to the risk of high voltage;
(3) The single voltage acquisition circuit can form an active equalization circuit for the battery pack through simple expansion, and the operation of the equalization circuit can autonomously transfer energy from a high-voltage battery to a low-voltage battery;
(4) Considering the factors of the internal resistance of a cable (generally dozens of milliohms or more) for connecting the battery and the acquisition board, the conduction internal resistance of the MOS tube and the like, the invention provides a compensation calculation formula for measuring the voltage of a battery monomer, and the compensation calculation formula for the battery positioned at the topmost end and the bottommost end is slightly different from the compensation calculation formula for the battery positioned at other positions;
(5) A plurality of MOS tubes at different levels in the circuit are driven by adopting a capacitance blocking method, the grid drive signal level of the MOS tubes can be automatically adjusted according to the source voltage of the MOS tubes, a large number of drive chips can be saved, and meanwhile, the grid source voltage is protected by utilizing a voltage stabilizing tube, so that the safety of the MOS tubes is ensured.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (1)
1. A support monomer voltage acquisition circuit that arbitrary section battery is established ties which characterized in that includes: the battery voltage control circuit comprises N batteries, N voltage mapping circuits, a multiplexer, an AD converter and a CPU, wherein the N batteries are connected in parallel in a one-to-one correspondence mode, the N voltage mapping circuits are connected with the multiplexer in series, a first end of the AD converter is connected with the multiplexer, a second end of the AD converter is connected with a first end of the CPU, and a second end of the CPU is connected with the multiplexer;
wherein the voltage mapping circuit comprises: the circuit comprises a resistor R1, a capacitor C2, a voltage stabilizing diode D1, a field effect tube Q1 and a transformer, wherein a first end of the capacitor C1 is connected with a CLK end, a second end of the capacitor C1 is respectively connected with a first end of the resistor R1, a cathode of the voltage stabilizing diode D1 and a base electrode of the field effect tube Q1, a second end of the resistor R1, a first end of the capacitor C2, an anode of the voltage stabilizing diode D1 and an emitting electrode of the field effect tube Q1 are connected with a negative electrode corresponding to a battery, an anode of the battery is connected with a first end of a primary coil in the transformer, a second end of the primary coil is respectively connected with a second end of the capacitor C2 and a collecting electrode of the field effect tube Q1, a first end of a secondary coil in the transformer is connected with the multiplexer, and a second end of the secondary coil is grounded; the expression of the sampling voltage of the battery cells at the non-two ends is as follows:
V SAMPi ＝V ini+ -V ini- -I×(R mosi +R Lia ) i＝1，i≠N
wherein, V SAMPi Indicating the sampled voltage, V, of the ith cell ini+ Indicates the positive voltage, V, of the ith cell ini- Indicating the negative voltage of the ith battery, I indicating the current in the primary side loop at the sampling time, R mosi Denotes the on-resistance, R, of the field effect transistor Lia Representing the parasitic resistance of the primary side of the transformer; two-terminal batteryThe expression of the sampling voltage of the single body is as follows:
V SAMPi ＝V ini+ -V ini- -I×(R x +R mosi +R Lia ) i＝1，i＝N
wherein, V SAMPi Indicating the sampled voltage, V, of the ith cell ini+ Indicates the positive voltage, V, of the ith cell ini- Denotes the negative voltage of the ith battery, I denotes the current in the primary side loop at the sampling time, R x Representing the parasitic impedance, R, of the primary side circuit to the battery connection mosi On-resistance of field effect transistor, R Lia Representing the parasitic resistance of the primary side of the transformer.
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| CN212462830U (en) * | 2020-06-15 | 2021-02-02 | 深圳市爱图仕影像器材有限公司 | Series-parallel switching circuit based on multiple batteries and lamp |
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| US20130158914A1 (en) * | 2011-12-16 | 2013-06-20 | Chung-Shan Institute of Science and Technology, Armaments, Bureau, Ministry of National Defense | Apparatus for Measuring the State of Charge of a Battery Pack via Measuring an Open Circuit Voltage |
| CN103560568A (en) * | 2013-11-19 | 2014-02-05 | 徐宏 | Series battery pack and single terminal voltage detection method of series battery pack |
| CN104935051A (en) * | 2015-06-30 | 2015-09-23 | 深圳市理邦精密仪器股份有限公司 | A series battery equalization circuit |
| CN107040002B (en) * | 2016-02-03 | 2019-08-20 | 深圳市爱兰博功率电子有限公司 | Balance-type charge and discharge device and method |
| CN106602653B (en) * | 2016-12-23 | 2018-12-28 | 山东航天电子技术研究所 | A kind of lithium ion battery non-dissipative equalizing circuit |
| CN106501734B (en) * | 2016-12-29 | 2019-05-31 | 东莞钜威动力技术有限公司 | The voltage acquisition fault handling method and device of battery management system |
| CN107167650A (en) * | 2017-06-26 | 2017-09-15 | 上海空间电源研究所 | High common mode single battery voltage collection circuit and acquisition method |
| CN207007937U (en) * | 2017-07-31 | 2018-02-13 | 协能济（北京）储能科技有限公司 | A kind of detection circuit of multi-section serial battery voltage |
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| CN110146820A (en) * | 2019-05-23 | 2019-08-20 | 武汉市康达电气有限公司 | Realize the apparatus and method of hydrogen fuel cell voltage high speed acquisition and real-time Transmission |
| CN210123897U (en) * | 2019-06-01 | 2020-03-03 | 珠海东帆科技有限公司 | Battery equalization circuit |
| CN110901465B (en) * | 2019-11-13 | 2022-11-01 | 东风航盛（武汉）汽车控制系统有限公司 | Method for improving monomer voltage acquisition precision during BMS (battery management system) balanced starting |
| CN212845811U (en) * | 2020-07-15 | 2021-03-30 | 杭州鼎毅电子科技有限公司 | Be applied to FTU battery monitoring module's voltage acquisition circuit |
| CN212659993U (en) * | 2020-08-21 | 2021-03-05 | 深圳市友利源电池科技有限公司 | Automatic equalizing charging circuit for power supply |
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| CN212462830U (en) * | 2020-06-15 | 2021-02-02 | 深圳市爱图仕影像器材有限公司 | Series-parallel switching circuit based on multiple batteries and lamp |
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