CN114062947A - Battery voltage acquisition equalization circuit and system based on BMS - Google Patents
Battery voltage acquisition equalization circuit and system based on BMS Download PDFInfo
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- CN114062947A CN114062947A CN202111263039.9A CN202111263039A CN114062947A CN 114062947 A CN114062947 A CN 114062947A CN 202111263039 A CN202111263039 A CN 202111263039A CN 114062947 A CN114062947 A CN 114062947A
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- battery
- battery management
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- management chip
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 16
- 239000003990 capacitor Substances 0.000 claims description 20
- 238000001914 filtration Methods 0.000 claims description 12
- 108010077333 CAP1-6D Proteins 0.000 claims description 9
- 108010031970 prostasin Proteins 0.000 claims description 9
- 102100027241 Adenylyl cyclase-associated protein 1 Human genes 0.000 claims 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 7
- 229910052744 lithium Inorganic materials 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 102100029500 Prostasin Human genes 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- 239000000178 monomer Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 101000897856 Homo sapiens Adenylyl cyclase-associated protein 2 Proteins 0.000 description 1
- 101000836079 Homo sapiens Serpin B8 Proteins 0.000 description 1
- 101000836075 Homo sapiens Serpin B9 Proteins 0.000 description 1
- 101000661807 Homo sapiens Suppressor of tumorigenicity 14 protein Proteins 0.000 description 1
- 101000798702 Homo sapiens Transmembrane protease serine 4 Proteins 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 102100037942 Suppressor of tumorigenicity 14 protein Human genes 0.000 description 1
- 102100032471 Transmembrane protease serine 4 Human genes 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
-
- 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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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a battery voltage acquisition balancing circuit and system based on a BMS (battery management system), belonging to the field of lithium battery management; the circuit specifically comprises a battery management chip, a signal line, a load circuit, a filter circuit, an electrostatic protection circuit and a voltage conversion module; a plurality of battery models are connected in series by utilizing a signal line, power loss is generated through a filter circuit and a load circuit, so that the voltage of the battery is reduced, the balance effect is achieved, meanwhile, the overall safety is improved by utilizing an electrostatic protection circuit, the overshoot and over-discharge risks of the battery are reduced, and the service life of the battery is prolonged.
Description
Technical Field
The invention discloses a battery voltage acquisition and equalization circuit and system based on a BMS (battery management system), and relates to the technical field of lithium battery management.
Background
With the development of battery technology, lithium ion batteries have the advantages of small size, light weight, high energy density, no memory effect, small self-discharge, long cycle life and the like, and are widely applied to the fields of new energy automobiles, photovoltaic energy storage and the like. The BMS is called a battery management system, and is mainly used for carrying out data acquisition, analysis, state estimation and management on parameters such as electrical characteristics and thermal characteristics of each battery unit, improving the utilization rate of the battery, preventing the battery from being overcharged and overdischarged and prolonging the service life of the battery.
The existing BMS battery management system often causes incomplete consistency of voltage parameters of each battery in the repeated charging and discharging process due to small individual differences of parameter characteristics between battery cells in the long-time use process of a lithium battery pack. The problem that some batteries are not fully charged and some batteries have the overshoot risk in the charging process is caused; some batteries are not fully discharged during the discharge process, and some batteries have the risk of overdischarge. These phenomena affect the service life of the battery and even cause safety accidents.
Therefore, the invention provides a battery voltage acquisition and equalization circuit and system based on a BMS (battery management system) to solve the problems.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a battery voltage acquisition and equalization circuit and system based on a BMS (battery management system), and the adopted technical scheme is as follows: a BMS-based battery voltage acquisition and equalization system specifically comprises a battery management chip, a signal line, a load module, a filtering module, an electrostatic protection module and a voltage conversion module;
the battery management chip is connected with the electrostatic protection module through the filtering module, the electrostatic protection module is connected with the voltage conversion module through the load module, and the voltage conversion module is connected with two ends of the battery through signal lines.
The battery management chip adopts an LTC6811 chip.
The electrostatic protection module is realized by combining diodes.
The load module is realized by a resistor.
The filtering module is realized by capacitor combination.
The utility model provides a battery voltage gathers equalizer circuit based on BMS, the circuit specifically include battery management chip, signal line, load circuit, filter circuit, static protection circuit and voltage conversion module:
the battery management chip adopts an LTC6811 chip;
the electrostatic protection circuit comprises diodes D1-D3, the load circuit comprises R1-R3, the filter circuit comprises CAP 1-2, and the voltage conversion circuit comprises an MOS tube Q1;
the pin C2 of the battery management chip is connected with the negative terminal voltage of the battery through a signal wire, the pin C of the battery management chip is connected with the pin 1 of the capacitor CAP1, and the pin 2 of the capacitor CAP1 is grounded;
a C1 pin of the battery management chip is connected with a signal line to the anode of the battery through a capacitor R3, and a diode D1 is connected between the anode and the cathode of the battery in series through a resistor R1;
the pins C1 and C2 of the battery management chip are connected through a diode D3;
the pin S2 of the battery management chip is connected to the grid G of the MOS tube Q1 through a resistor R2, and the grid G of the MOS tube Q1 is connected with a signal line through a diode D2.
The diode D1 is a TVS diode, and the diodes D2 and D3 are anti-static diodes.
The pins C1 and C2 of the battery management chip are ADC monomer voltage acquisition pins.
The invention has the beneficial effects that: the invention utilizes the signal wire to connect a plurality of battery models in series, generates power loss through the filter circuit and the load circuit, reduces the voltage of the battery, achieves the effect of balance, simultaneously utilizes the electrostatic protection circuit to improve the overall safety, reduces the overshoot and over-discharge risks of the battery, and prolongs the service life of the battery.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are 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 a schematic structural diagram of an embodiment of the circuit of the present invention.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
The first embodiment is as follows:
a BMS-based battery voltage acquisition and equalization system specifically comprises a battery management chip, a signal line, a load module, a filtering module, an electrostatic protection module and a voltage conversion module;
the battery management chip is connected with the electrostatic protection module through the filtering module, the electrostatic protection module is connected with the voltage conversion module through the load module, and the voltage conversion module is connected with two ends of the battery through signal lines;
the battery management chip adopts an LTC6811 chip;
the electrostatic protection module is realized by combining diodes;
the load module is realized by a resistor;
the filtering module is realized by capacitor combination.
Example two:
the utility model provides a battery voltage gathers equalizer circuit based on BMS, the circuit specifically include battery management chip, signal line, load circuit, filter circuit, static protection circuit and voltage conversion module:
the battery management chip adopts an LTC6811 chip;
the electrostatic protection circuit comprises diodes D1-D3, the load circuit comprises R1-R3, the filter circuit comprises CAP 1-2, and the voltage conversion circuit comprises an MOS tube Q1;
the pin C2 of the battery management chip is connected with the negative terminal voltage of the battery through a signal wire, the pin C of the battery management chip is connected with the pin 1 of the capacitor CAP1, and the pin 2 of the capacitor CAP1 is grounded;
a C1 pin of the battery management chip is connected with a signal line to the anode of the battery through a capacitor R3, and a diode D1 is connected between the anode and the cathode of the battery in series through a resistor R1;
the pins C1 and C2 of the battery management chip are connected through a diode D3;
the S2 pin of the battery management chip is connected to the grid G of the MOS tube Q1 through a resistor R2, and the grid G of the MOS tube Q1 is connected with a signal line through a diode D2;
further, the diode D1 is a TVS diode, and the diodes D2 and D3 are anti-static diodes;
furthermore, pins C1 and C2 of the battery management chip are ADC monomer voltage acquisition pins;
as shown in fig. 1, the signal lines C1 and C2 are connected to the first lithium battery indirectly, and the signal lines C2 and C3 are connected to the second lithium battery indirectly; by analogy, the U1 battery management chips from C0 to C12 have 13 groups of voltage acquisition terminals, and can manage battery packs formed by connecting 12 lithium batteries in series;
in the figure, U1 is a battery management chip LTC6811, a pin 24 of which is connected to a signal line C1, a C1 signal line is used for connecting a battery cathode of a first lithium battery, and the LTC6811 collects terminal voltage of the battery connected with the C1 signal line through the pin 24; the 24 pins of the U1 chip are simultaneously connected to the 1 pin of the capacitor CAP1, and the 2 pins of the capacitor CAP1 are grounded; the capacitor CAP1 is a filter capacitor and plays a role in filtering; the pin 22 of the U1 chip is connected to a signal C2 through a resistor R3, a C2 signal line is used for connecting the anode of the first battery and the cathode of the second battery, and the first battery and the second battery are connected in series;
the 20 feet of the U1 chip are connected to a signal C3 through a resistor R6, a C3 signal line is used for connecting the positive pole of a second battery and the negative pole of a third battery, and the second battery and the third battery are connected in series;
by analogy, the battery management chip U1 can manage 12 battery packs connected in series at most; the capacitor CAP2 is a filter capacitor and is connected between the 22 pin C2 and the 24 pin C1 of the chip U1 for filtering; the capacitor CAP3 is a filter capacitor and is connected between the 20 pin C3 and the 22 pin C2 of the chip U1 for filtering; the diode D3 is an anti-static diode and plays a role in electrostatic protection, wherein a pin 1 of D3 is connected to a pin 24C 1 of the chip U1, and a pin 2 of D3 is connected to a pin 22C 2 of the chip U1; the diode D6 is an anti-static diode and plays a role in electrostatic protection, wherein a pin 1 of D6 is connected to a pin 22C 2 of the chip U1, and a pin 2 of D6 is connected to a pin 20C 3 of the chip U1; a pin 23S 2 of the chip U1 is connected to a gate G of the MOS transistor Q1 through a resistor R2; a pin 21S 3 of the chip U1 is connected to a gate G of the MOS transistor Q2 through a resistor R5; diodes D2 and D5 are anti-static diodes; the diodes D1 and D4 are TVS diodes and are connected between the positive electrode and the negative electrode of the battery after being connected in series with the resistors R1 and R4 respectively, so that the function of preventing the battery from being connected reversely to damage the circuit is achieved; r1 and R4 are load resistors, when voltage among batteries is inconsistent, the MOS tube is conducted, current passes through R1 or R4 at the moment, power loss is generated, and therefore the voltage of the batteries is reduced, and the voltage balancing effect is achieved.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. A BMS-based battery voltage acquisition and equalization system is characterized by specifically comprising a battery management chip, a signal line, a load module, a filtering module, an electrostatic protection module and a voltage conversion module; the battery management chip is connected with the electrostatic protection module through the filtering module, the electrostatic protection module is connected with the voltage conversion module through the load module, and the voltage conversion module is connected with two ends of the battery through signal lines.
2. The system of claim 1, wherein the battery management chip is a LTC6811 chip.
3. The system of claim 2, wherein the electrostatic protection module is implemented by a diode combination.
4. The system of claim 3, wherein the load module is implemented by a resistor.
5. The system of claim 4, wherein the filtering module is implemented by a combination of capacitors.
6. A BMS-based battery voltage acquisition and equalization circuit, the system of claim 5, wherein the circuit specifically comprises a battery management chip, a signal line, a load circuit, a filter circuit, an electrostatic protection circuit and a voltage conversion module:
the battery management chip adopts an LTC6811 chip;
the electrostatic protection circuit comprises diodes D1-D3, the load circuit comprises R1-R3, the filter circuit comprises CAP 1-2, and the voltage conversion circuit comprises an MOS tube Q1;
the pin C2 of the battery management chip is connected with the negative terminal voltage of the battery through a signal wire, the pin C of the battery management chip is connected with the pin 1 of the capacitor CAP1, and the pin 2 of the capacitor CAP1 is grounded;
a C1 pin of the battery management chip is connected with a signal line to the anode of the battery through a capacitor R3, and a diode D1 is connected between the anode and the cathode of the battery in series through a resistor R1;
the pins C1 and C2 of the battery management chip are connected through a diode D3;
the pin S2 of the battery management chip is connected to the grid G of the MOS tube Q1 through a resistor R2, and the grid G of the MOS tube Q1 is connected with a signal line through a diode D2.
7. The circuit as claimed in claim 6, wherein the diode D1 is a TVS diode, and the diodes D2 and D3 are ESD protection diodes.
8. The circuit of claim 7, wherein the C1 and C2 pins of the battery management chip are ADC cell voltage acquisition pins.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111263039.9A CN114062947A (en) | 2021-10-28 | 2021-10-28 | Battery voltage acquisition equalization circuit and system based on BMS |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111263039.9A CN114062947A (en) | 2021-10-28 | 2021-10-28 | Battery voltage acquisition equalization circuit and system based on BMS |
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| CN114062947A true CN114062947A (en) | 2022-02-18 |
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| CN202111263039.9A Pending CN114062947A (en) | 2021-10-28 | 2021-10-28 | Battery voltage acquisition equalization circuit and system based on BMS |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103019234A (en) * | 2012-12-26 | 2013-04-03 | 中国汽车技术研究中心 | Battery management and acquisition subsystem of new energy vehicle and method for controlling battery management and acquisition subsystem |
| CN104868546A (en) * | 2015-05-25 | 2015-08-26 | 沈阳中科一唯电子技术有限公司 | Cell management system |
| JP2017216829A (en) * | 2016-05-31 | 2017-12-07 | 三洋電機株式会社 | Management device and power supply system |
| CN110962680A (en) * | 2019-01-21 | 2020-04-07 | 宁德时代新能源科技股份有限公司 | Storage battery monitoring system, battery pack and electric automobile |
| CN111130083A (en) * | 2018-10-31 | 2020-05-08 | 意法半导体股份有限公司 | Circuit with hot plug protection, corresponding electronic equipment, vehicle and method |
| CN111769616A (en) * | 2020-07-09 | 2020-10-13 | 珠海迈巨微电子有限责任公司 | Battery voltage monitoring device and battery management system |
| US20200395753A1 (en) * | 2019-06-17 | 2020-12-17 | Texas Instruments Incorporated | Electrostatic discharge (esd) protection circuit with disable feature based on hot-plug condition detection |
| US20210132155A1 (en) * | 2019-11-05 | 2021-05-06 | Hyundai Autron Co., Ltd. | Bms semiconductor device having leakage current detection function and leakage current detection method thereof |
-
2021
- 2021-10-28 CN CN202111263039.9A patent/CN114062947A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103019234A (en) * | 2012-12-26 | 2013-04-03 | 中国汽车技术研究中心 | Battery management and acquisition subsystem of new energy vehicle and method for controlling battery management and acquisition subsystem |
| CN104868546A (en) * | 2015-05-25 | 2015-08-26 | 沈阳中科一唯电子技术有限公司 | Cell management system |
| JP2017216829A (en) * | 2016-05-31 | 2017-12-07 | 三洋電機株式会社 | Management device and power supply system |
| CN111130083A (en) * | 2018-10-31 | 2020-05-08 | 意法半导体股份有限公司 | Circuit with hot plug protection, corresponding electronic equipment, vehicle and method |
| CN110962680A (en) * | 2019-01-21 | 2020-04-07 | 宁德时代新能源科技股份有限公司 | Storage battery monitoring system, battery pack and electric automobile |
| US20200395753A1 (en) * | 2019-06-17 | 2020-12-17 | Texas Instruments Incorporated | Electrostatic discharge (esd) protection circuit with disable feature based on hot-plug condition detection |
| US20210132155A1 (en) * | 2019-11-05 | 2021-05-06 | Hyundai Autron Co., Ltd. | Bms semiconductor device having leakage current detection function and leakage current detection method thereof |
| CN111769616A (en) * | 2020-07-09 | 2020-10-13 | 珠海迈巨微电子有限责任公司 | Battery voltage monitoring device and battery management system |
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Application publication date: 20220218 |