CN114156982B - BMS system zero drift compensation circuit and method - Google Patents
BMS system zero drift compensation circuit and method Download PDFInfo
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- CN114156982B CN114156982B CN202111467982.1A CN202111467982A CN114156982B CN 114156982 B CN114156982 B CN 114156982B CN 202111467982 A CN202111467982 A CN 202111467982A CN 114156982 B CN114156982 B CN 114156982B
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000005070 sampling Methods 0.000 claims abstract description 26
- 238000006243 chemical reaction Methods 0.000 claims abstract description 22
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims description 10
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- 239000004065 semiconductor Substances 0.000 abstract description 10
- 230000002829 reductive effect Effects 0.000 abstract description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 6
- 229910052744 lithium Inorganic materials 0.000 description 6
- 230000002441 reversible effect Effects 0.000 description 6
- 238000005259 measurement Methods 0.000 description 5
- 230000003321 amplification Effects 0.000 description 3
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- 238000004891 communication Methods 0.000 description 1
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- 230000003068 static effect Effects 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0069—Charging or discharging for charge maintenance, battery initiation or rejuvenation
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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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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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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- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacturing & Machinery (AREA)
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- General Chemical & Material Sciences (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention relates to a zero drift compensation circuit of a BMS system, which comprises a voltage detection module, a voltage regulation module, an analog-to-digital conversion module and a control module. The analog-to-digital conversion module is respectively connected with the voltage regulation module and the control module, and the control module controls the analog-to-digital conversion module to measure the measured voltage value of the voltage regulation module and acquire the measured voltage value; the control module is also used for controlling the AFE chip to acquire the sampling voltage value of the battery to be detected and acquire the sampling voltage value. In addition, a BMS system zero drift compensation method is also provided. According to the BMS system zero drift compensation circuit and the BMS system zero drift compensation method, aiming at the fact that the semiconductor device is easily affected by zero drift, the use of the semiconductor element is reduced, the high-precision resistor which is not easily affected by the zero drift is adopted as a reference element, the influence of the zero drift in the compensation process is reduced, and the zero drift compensation of the AFE chip is accurate.
Description
Technical Field
The invention relates to the technical field of lithium battery energy storage, in particular to a zero drift compensation circuit and method of a BMS system.
Background
With the state's inclination to the policy of the new energy industry, lithium battery and BMS (battery management system ) systems are widely used in many fields. For accurate and rapid acquisition of battery voltage information, BMS systems typically employ a specialized AFE (analog front end) chip for sampling. However, the semiconductor devices including the AFE chip often suffer from zero drift due to environmental temperature changes, resulting in sampling distortion.
Zero drift is an inherent characteristic of semiconductor devices, and temperature effects are a major factor in zero drift. The process is that the semiconductor device is affected by temperature, the static working point moves, amplification distortion is caused, and along with gradual amplification, errors are obviously amplified, so that sampling is inaccurate. In order to ensure the safe operation of the lithium battery, the BMS system has higher requirements on voltage acquisition precision, and errors caused by zero drift cannot be ignored.
In a BMS system, the environments of all the AFE chips are not identical, and the physique of each chip is not identical, so that the influence of zero drift is often extremely different and difficult to estimate. When and how much compensation is performed, it is difficult to determine. The traditional method generally adds a certain compensation amount as zero drift compensation by detecting the temperature value of the circuit board according to a temperature drift curve provided by a chip manufacturer. However, since each chip is affected by the zero drift, there is a difference in physique between chips, and this compensation method may amplify errors, even in industries that have strict requirements on charge and discharge voltages, such as energy storage, this compensation method may even cause an overcharge risk to the battery cells.
Disclosure of Invention
Accordingly, it is desirable to provide a BMS system zero drift compensation circuit and method that can reduce the influence of zero drift and compensate more accurately.
The BMS system zero drift compensation circuit comprises a voltage detection module, a voltage regulation module, an analog-to-digital conversion module and a control module;
the voltage detection module comprises an operational amplifier, a non-inverting input resistor, an inverting input resistor, a non-inverting grounding resistor and a feedback resistor, wherein one end of the non-inverting input resistor is connected with the non-inverting input end of the operational amplifier and one end of the non-inverting grounding resistor, the other end of the non-inverting grounding resistor is grounded, and the other end of the non-inverting input resistor is used for receiving the positive electrode of a battery to be detected; one end of the reverse input resistor is connected with the reverse input end of the operational amplifier and one end of the feedback resistor, the other end of the feedback resistor is connected with the output end of the operational amplifier, and the other end of the reverse input resistor is used for being connected with the negative electrode of the battery to be detected;
the voltage regulating module comprises a measuring resistor, a plurality of voltage dividing resistors and corresponding relays, one ends of the voltage dividing resistors are grounded, the other ends of the voltage dividing resistors are respectively connected with one end of the measuring resistor through a main circuit of the corresponding relay, the other ends of the measuring resistors are connected with the output end of the operational amplifier, and a control circuit of the relay is connected with the control module;
the analog-to-digital conversion module is respectively connected with the voltage regulation module and the control module, and the control module controls the analog-to-digital conversion module to measure the measured voltage value of the voltage regulation module and acquire the measured voltage value; the control module is also used for controlling the AFE chip to acquire the sampling voltage value of the battery to be detected and acquire the sampling voltage value.
Further, the analog-to-digital conversion module is an ADC chip.
Further, the control module controls the MCU for the battery pack slave board in the BMS system.
Further, the voltage regulating module further comprises a filter resistor and a filter capacitor, wherein one end of the filter resistor is connected with one end of the measuring resistor, which is connected with the output end of the operational amplifier, and the other end of the filter resistor is grounded, and one end of the filter capacitor is connected with the other end of the measuring resistor, and the other end of the filter capacitor is grounded.
Further, the resistance values of the in-phase input resistor, the anti-phase input resistor and the feedback resistor are the same as those of the in-phase grounding resistor.
Further, the resistance values of the plurality of voltage dividing resistors are the same.
A BMS system zero drift compensation method, the method comprising:
connecting a voltage detection module with two ends of a battery to be detected;
the control module controls the analog-to-digital conversion module to measure a plurality of measured voltage values at two ends of the measuring resistor when the voltage regulating module regulates the voltage to different voltages;
the measured voltages are calculated, and a real voltage value of the battery to be detected and a time drift parameter of the analog-digital conversion module are obtained;
and comparing the real voltage value with the sampling voltage value of the battery to be detected acquired by the AFE chip to obtain a zero drift compensation quantity.
Further, the control module controls the analog-to-digital conversion module to collect a plurality of measured voltages at two ends of the measuring resistor when the voltage adjusting module adjusts to different voltages, and the method further comprises the following steps:
and calibrating the parameters, and calibrating initial deviation parameters.
Further, the method further comprises:
changing the voltage at two ends of the measuring resistor through a voltage adjusting module to obtain a plurality of real voltage values of the battery to be detected;
and inputting the real voltage values into a Kalman filter to obtain a stable real voltage value.
According to the BMS system zero drift compensation circuit and the BMS system zero drift compensation method, aiming at the fact that the semiconductor device is easily affected by zero drift, the use of the semiconductor element is reduced, the high-precision resistor which is not easily affected by the zero drift is adopted as a reference element, the influence of the zero drift in the compensation process is reduced, and the zero drift compensation of the AFE chip is accurate.
Drawings
Fig. 1 is a zero drift compensation circuit diagram of a BMS system according to an embodiment;
fig. 2 is a flowchart of a BMS system zero drift compensation method according to an embodiment.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, in one embodiment, a BMS system zero drift compensation circuit includes a voltage detection module, a voltage adjustment module, an analog-to-digital conversion module U4, and a control module U2.
The voltage detection module comprises an operational amplifier U1, a non-inverting input resistor, an inverting input resistor, a non-inverting grounding resistor R5 and a feedback resistor R6, wherein the non-inverting input resistor comprises two resistors R2 and R4 which are connected in series, and the inverting input resistor comprises two resistors R1 and R3 which are connected in series. One end of the in-phase input resistor is connected with one end of the in-phase input end of the operational amplifier U1 and one end of the in-phase grounding resistor R5, and the other end of the in-phase grounding resistor R5 is grounded. The other end of the non-inverting input resistor R5 is used for receiving the positive electrode of the battery BAT0 to be checked. One end of the reverse input resistor is connected with the reverse input end of the operational amplifier U1 and one end of the feedback resistor R6, the other end of the feedback resistor R6 is connected with the output end of the operational amplifier U1, and the other end of the reverse input resistor is used for receiving the negative electrode of the battery BATO to be inspected. The Analog-to-Digital converter module U4 is an ADC (Analog-to-Digital converter) chip. The control module U2 controls the MCU for the battery pack slave board in the BMS system. The resistance of the in-phase input resistor, the reverse-phase input resistor and the feedback resistor R6 is the same as that of the in-phase grounding resistor R5. The resistance values of the plurality of voltage dividing resistors are the same.
The voltage regulating module includes a measuring resistor R7, a plurality of voltage dividing resistors and corresponding relays, and in this embodiment, four voltage dividing resistors R9, R10, R11, R12 and corresponding four relays RL1, RL2, RL3, RL4 are adopted. One end of each of the voltage dividing resistors is grounded, the other end of each voltage dividing resistor is connected with one end of a measuring resistor R7 through a main circuit of a corresponding relay, the other end of each measuring resistor R7 is connected with the output end of the operational amplifier U1, and a control circuit of the relay is connected with the control module U2. The voltage regulation module further comprises a filter resistor R8 and a filter capacitor C1, one end of the filter resistor R8 is connected with one end of the output end of the operational amplifier U1, the other end of the filter resistor R8 is grounded, one end of the filter capacitor C1 is connected with the other end of the measurement resistor R7, and the other end of the filter capacitor C1 is grounded.
The analog-to-digital conversion module U4 is respectively connected with the voltage regulation module and the control module U2, and the control module U2 controls the analog-to-digital conversion module U4 to acquire a measured voltage value of the voltage regulation module and acquire the measured voltage value; the control module is also used for controlling the AFE chip to acquire the sampling voltage value of the battery to be detected and acquire the sampling voltage value.
In an energy storage system, a plurality of lithium batteries are connected in series, and each AFE chip is responsible for monitoring a plurality of strings of lithium batteries. The voltage detection module is connected to the two ends of each AFE chip responsible for the first battery from the total negative electrode of the lithium battery string, namely the battery BAT0 to be detected. Since the zero drift varies with the ambient temperature, the voltage detection module needs to be connected to the battery under test BAT0 in real time. Because of the virtual break characteristic of the operational amplifier U1, the impedance of the voltage detection module inlet is extremely high, and the influence on a main circuit is avoided. Because common switching elements such as triodes and MOS tubes are conducted to generate voltage drop, the voltage drop parameters cannot be accurately determined, and the semiconductor element is easily affected by zero drift. The relay is switched on and off by means of the internal electric shock actuation control circuit, voltage drop is not generated, zero drift is not easy to influence, and therefore all switch elements are switched on and off by means of the relay control circuit.
In this embodiment, all resistors are high-precision resistors. The operational amplifier U1 is an integrated operational amplifier. The filter resistor R8 and the filter capacitor C1 form a low-pass filter for filtering high-frequency clutter interference in the circuit.
Sampling pins of the ADC chip are respectively connected to two ends of the measuring resistor R7. The ADC chip is communicated with the control module U2, the control module U2 sends a sampling instruction to the ADC chip, and the ADC chip transmits a sampling result to the control module U2. The control module U2 is a battery pack slave board control MCU of the BMS system, and is used for controlling the work of the AFE chip and the upper layer communication of the BMS system, and is required to be communicated with the ADC chip and simultaneously controlling the on-off of relays RL1, RL2, RL3 and RL4.
As shown in fig. 2, in one embodiment, a BMS system zero drift compensation method includes the following steps:
step S210, connecting the voltage detection modules to two ends of the battery to be detected.
In step S220, the control module controls the analog-to-digital conversion module to collect a plurality of measured voltage values at two ends of the measuring resistor when the voltage adjustment module adjusts to different voltages. Before this step, the parameters need to be calibrated, calibrating the initial bias parameters.
Step S230, a plurality of measured voltage values are calculated to obtain the real voltage value of the battery to be detected and the time drift parameter of the analog-digital conversion module.
And step S240, comparing the real voltage value with the sampling voltage value of the battery to be detected acquired by the AFE chip to obtain the zero drift compensation quantity.
In this embodiment, the BMS system zero drift compensation method further includes:
changing the voltage at two ends of the measuring resistor through a voltage adjusting module to obtain a plurality of real voltage values of the battery to be detected; and inputting a plurality of real voltage values into a Kalman filter to obtain a stable real voltage value.
Under normal temperature, each component is not subjected to zeroThe point drift affects, and because of the physique difference of each element, the process installation has errors, the parameters need to be calibrated, and the initial deviation parameter alpha is calibrated 1 This parameter is the initial error of the AFE chip and the sampling ADC chip. Because zero drift is affected by the temperature of the system in real time, the zero drift needs to be accessed into a main circuit by default, sampled in real time and calibrated at any time. The operational amplifier has extremely large input impedance due to its virtual-break property, so that the influence on the main circuit is extremely small. The differential amplifier based on the operational amplifier has the advantages that the noninverting input end and the inverting input end of the differential amplifier are simultaneously connected with two paths of common mode signals, and the influence caused by zero drift can be avoided just during superposition. The amplification factor is 1:1 as calculated by a differential amplifier correlation formula. When calibration is started, the AFE chip needs to sample the battery BAT0 to be detected, and the first battery voltage data of the total negative electrode is reserved as sample data AFE chip sampling voltage value B 0 At the same time, the ADC chip starts measurement. After the voltage dividing resistors R9, R10, R11 and R12 are connected in parallel, the voltage dividing resistors R9, R10, R11 and R12 are connected in series with the measuring resistor R7, and the resistance of the voltage dividing resistors R9, R10, R11 and R12 is the same and four times of that of the measuring resistor R7, for example, the resistance of the voltage dividing resistors R9, R10, R11 and R12 is 4kΩ, and the resistance of the measuring resistor R7 is 1kΩ. The parallel equivalent resistance is changed by controlling the on-off of relays RL1, RL2, RL3 and RL4, and the voltage of the parallel equivalent resistor and a measuring resistor R7 is divided. Changing the resistance of parallel equivalent resistor, i.e. changing the voltage division value of measuring resistor R7, aiming at eliminating unknown ADC chip zero drift parameter beta 1 . For example, when all relays RL1, RL2, RL3, RL4 are actuated, all the voltage dividing resistors R9, R10, R11, R12 are connected in parallel, and the equivalent resistance value thereof is 1/4 of the single resistance value, i.e., 1kΩ. Since the resistance of the measuring resistor R7 is 1kΩ, the partial pressure ratio is 1:1. Since the measured voltage value of the battery to be measured BAT0 is affected by the zero drift and is not a true value, the true voltage value of the battery to be measured BAT0 is set to be U. The voltage division ratio is 1:1, and the voltage at two sides of R7 is U/2. Because the ADC chip is affected by unknown zero drift, if the measured voltage value is not the true value, setting the time drift parameter of the ADC chip as beta 1 . ADC chip measurement B at this time 1 ＝U/2+β 1 . The relays RL1 and RL2 are attracted, namely the divider resistors R9 and R10 are connected in parallel, and the equivalent resistance value thereof is that1/2 of the single resistance value, namely 2k omega. Since the resistance of the measuring resistor R7 is 1kΩ, the voltage division ratio is 2:1, and the voltage across R7 is U/3. ADC chip measurement B at this time 2 ＝U/3+β 1 . The relay RL1 is attracted, namely the voltage dividing resistor R9 is directly connected with the measuring resistor R7 in series, the resistance of the voltage dividing resistor R9 is 4k omega, and the resistance of the measuring resistor R7 is 1k omega, so that the voltage dividing ratio is 4:1, and the voltage at two sides of the measuring resistor R7 is U/5. ADC chip measurement B at this time 3 =u/5+β1. Three equations can be derived at this time: b (B) 1 ＝U/2+β 1 、B 2 ＝U/3+β 1 、B 3 ＝U/5+β 1 The ADC chip time drift parameter is beta can be obtained by simultaneous settlement 1 And the real voltage value U of the battery BAT0 to be tested.
In order to prevent errors caused by circuit fluctuation, component errors, electromagnetic interference and the like, the real voltage value U needs to be measured for multiple times, and the real voltage value U is input into a Kalman filter to filter the interference value, so that the stable and reliable real voltage value U is obtained. When no zero drift is affected, the real voltage value U should be the sum of the sampling voltage value of the AFE chip and the initial deviation parameter, and u=b 0 +α 1 . Is affected by zero drift, and needs to introduce AFE chip with the zero drift parameter beta 0 The real voltage value U should be the sum of the sampling voltage value of the AFE chip, the initial deviation parameter and the zero drift parameter of the AFE chip, and u=b 0 +α 1 +β 0 It can be solved that the zero drift parameter of the AFE chip is beta 0 . The compensation uses negative feedback to sample the voltage value B of the AFE chip according to the proportional integral algorithm 0 And compensating in real time until the sampling voltage value B0 is equal to the real voltage value U.
According to the BMS system zero drift compensation circuit and the BMS system zero drift compensation method, aiming at the fact that the semiconductor device is easily affected by zero drift, the use of the semiconductor element is reduced, the high-precision resistor which is not easily affected by the zero drift is adopted as a reference element, the influence of the zero drift in the compensation process is reduced, and the zero drift compensation of the AFE chip is accurate.
Meanwhile, the differential amplifier based on the operational amplifier has the advantages that the non-inverting input end and the inverting input end of the differential amplifier are simultaneously connected with two paths of common-mode signals, and the differential amplifier is just when overlappedThe influence caused by zero drift can be well avoided. Because zero drift can also affect the sampling ADC chip of the compensation circuit, the multi-resistor parallel connection is adopted, and the selection of the resistance value is carried out through relay gating; and obtaining a plurality of groups of reference voltages by connecting voltage dividing resistors in series for sampling and detecting the voltage of the measuring resistors by the ADC chip. Because the obtained reference voltage is the value of the sampling ADC chip after the zero point drift, a plurality of groups of data simultaneous equations are needed to calculate the real voltage value U. And compensating by negative feedback until sampling value B 0 Equal to the true voltage value U.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (9)
1. The BMS system zero drift compensation circuit is characterized by comprising a voltage detection module, a voltage regulation module, an analog-to-digital conversion module and a control module; the voltage detection module comprises an operational amplifier, a non-inverting input resistor, an inverting input resistor, a non-inverting grounding resistor and a feedback resistor, wherein one end of the non-inverting input resistor is connected with the non-inverting input end of the operational amplifier and one end of the non-inverting grounding resistor, the other end of the non-inverting grounding resistor is grounded, and the other end of the non-inverting input resistor is used for receiving the positive electrode of a battery to be detected; one end of the inverting input resistor is connected with the inverting input end of the operational amplifier and one end of the feedback resistor, the other end of the feedback resistor is connected with the output end of the operational amplifier, and the other end of the inverting input resistor is used for being connected with the negative electrode of the battery to be detected; the voltage regulating module comprises a measuring resistor, a plurality of voltage dividing resistors and corresponding relays, one ends of the voltage dividing resistors are grounded, the other ends of the voltage dividing resistors are respectively connected with one end of the measuring resistor through a main circuit of the corresponding relay, the other ends of the measuring resistors are connected with the output end of the operational amplifier, and a control circuit of the relay is connected with the control module; the analog-to-digital conversion module is respectively connected with the voltage regulation module and the control module, and the control module controls the analog-to-digital conversion module to measure the measured voltage value of the voltage regulation module and acquire the measured voltage value; the control module is also used for controlling the AFE chip to acquire the sampling voltage value of the battery to be detected and acquire the sampling voltage value.
2. The BMS system zero drift compensation circuit of claim 1, wherein the analog to digital conversion module is an ADC chip.
3. The BMS system zero drift compensation circuit according to claim 1, wherein said control module controls the MCU for a battery pack slave in a BMS system.
4. The BMS system zero drift compensation circuit according to claim 1, wherein said voltage adjustment module further comprises a filter resistor and a filter capacitor, one end of said filter resistor is connected to one end of said measuring resistor connected to said output end of said op-amp, the other end of said filter resistor is grounded, one end of said filter capacitor is connected to the other end of said measuring resistor, and the other end of said filter capacitor is grounded.
5. The BMS system zero drift compensation circuit according to claim 1, wherein the in-phase input resistor, the anti-phase input resistor, the feedback resistor and the in-phase ground resistor have the same resistance.
6. The BMS system zero drift compensation circuit according to claim 1, wherein the resistances of said plurality of voltage dividing resistors are the same.
7. A compensation method of the BMS system zero drift compensation circuit according to any one of claims 1 to 6, characterized in that the method comprises: connecting a voltage detection module with two ends of a battery to be detected; the control module controls the analog-to-digital conversion module to measure a plurality of measured voltage values at two ends of the measuring resistor when the voltage regulating module regulates the voltage to different voltages; the measured voltage values are calculated, and the real voltage value of the battery to be detected and the time drift parameter of the analog-digital conversion module are obtained; and comparing the real voltage value with the sampling voltage value of the battery to be detected acquired by the AFE chip to obtain a zero drift compensation quantity.
8. The compensation method of the BMS system zero drift compensation circuit according to claim 7, wherein the control module controls the analog-to-digital conversion module to collect a plurality of measured voltage values of the two ends of the measuring resistor when the voltage adjustment module adjusts to different voltages, further comprising: and calibrating the parameters, and calibrating initial deviation parameters.
9. The compensation method of the BMS system zero drift compensation circuit according to claim 8, wherein said method further comprises: changing the voltage at two ends of the measuring resistor through a voltage adjusting module to obtain a plurality of real voltage values of the battery to be detected; and inputting the real voltage values into a Kalman filter to obtain a stable real voltage value.
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