CN211579660U - Active equalization control system for energy storage battery - Google Patents
Active equalization control system for energy storage battery Download PDFInfo
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- CN211579660U CN211579660U CN202020535547.2U CN202020535547U CN211579660U CN 211579660 U CN211579660 U CN 211579660U CN 202020535547 U CN202020535547 U CN 202020535547U CN 211579660 U CN211579660 U CN 211579660U
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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
The utility model discloses an energy storage battery initiative equalizing control system, it includes: battery cell, BMS battery management module, full-isolation direct current converter, BMS monitors each battery BATT1～BATTNRespectively has a cell voltage of V1～VNThe voltage value of the reference cell is VmaxOf cells of lowest voltageVoltage value VminAnd setting a rated differential pressure value VEWhen V ismax‑Vmin＞VEBMS battery management module controls full-isolation DC converter to BATT VminThe battery cell is charged in a balanced manner until the voltage is consistent, BATT VminOne or more cells. Through with every electric core monomer full isolation direct current converter that the one-to-one is connected charges to electric core monomer, and the flexibility is high, owing to adopt opto-coupler control to charge and start, combines zero loss circuit of standby, and not only the security is good, and when unbalanced standby, zero loss makes energy consumption greatly reduced.
Description
Technical Field
The utility model belongs to the technical field of the battery is balanced, charges initiatively, in particular to energy storage battery initiative equalizing control system.
Background
The currently used battery equalization systems are passive and equalization is achieved by means of resistive heating and energy loss. The active equalization system discharges the electric core with high voltage to the electric core with low voltage, and because the structure of each electric core is in series connection, the phenomenon that the positive electrodes and the negative electrodes of two batteries are not isolated exists when the electric core with high voltage is discharged to the electric core with low voltage, so that the potential safety hazard is greatly increased.
Disclosure of Invention
The utility model aims at providing an energy storage battery initiative equalizing control system that the security is good, the flexibility is high and low energy consumption.
In order to solve the technical problem, the utility model adopts the following technical scheme: an energy storage battery active equalization control system, comprising: the lithium battery pack comprises a plurality of battery cell monomers; a BMS battery management module;
the control system also comprises a plurality of full-isolation direct current converters, each full-isolation direct current converter is connected with each battery cell monomer in a one-to-one correspondence manner and is used for charging the battery cell monomers,
and the BMS battery management module is used for detecting the voltage of each battery cell, and actively starting the full-isolation direct-current converter to charge the battery cell with low voltage when the BMS battery management module detects that the voltage of the battery cell drops faster than that of other battery cells.
Optimized, BMS battery management module includes battery sampling chip and MCU control chip, battery sampling chip is used for gathering electric core monomer voltage and with lithium cell group state information and transmit MCU control chip.
Furthermore, each full-isolation direct current converter comprises a standby zero-loss circuit, a PWM chip and an isolation transformer,
when the battery sampling chip acquires that the voltage of the battery cell monomer drops faster than that of other battery cells, the MCU control chip outputs a charging signal to the standby zero-loss circuit, the standby zero-loss circuit outputs the charging signal to enable the PWM chip to supply power, and then the PWM chip outputs a driving signal to start the isolation transformer to charge the battery cell monomer.
Furthermore, each full-isolation direct current converter further comprises a primary isolation feedback optocoupler, a rectifier diode, an absorption circuit and an output voltage stabilization feedback diode, wherein the primary isolation feedback optocoupler and the secondary isolation feedback optocoupler are connected with the PWM chip in a power supply mode, and the number of the rectifier diodes is two, and the rectifier diodes and the absorption circuit are respectively electrically connected with the isolation transformer.
More standby zero loss circuit include the opto-coupler, with triode and front end resistance and rear end resistance that the opto-coupler electricity is connected, the front end resistance connect in the output of opto-coupler with between the base of triode, the rear end resistance is connected between the base and the projecting pole of triode, the collecting electrode and the PWM chip power supply end of triode are connected.
The beneficial effects of the utility model reside in that: the utility model discloses a with every the full isolation direct current converter that electric core monomer one-to-one is connected charges to electric core monomer, and the flexibility is high, owing to adopt opto-coupler control charge to start, combines the zero loss circuit of standby, and not only the security is good, and is unbalanced, zero loss during the standby makes energy consumption greatly reduced.
Drawings
FIG. 1 is a block diagram of an active equalization control system of an energy storage battery
FIG. 2 shows an active equalization module (DC-DC full isolation converter)
Fig. 3 is a circuit diagram of the BMS.
Detailed Description
The invention will be described in detail below with reference to an exemplary embodiment shown in the drawings:
as shown in fig. 1-3, the active equalization control system for energy storage battery includes: a lithium battery pack including multiple cell units BATT1～BATTNBMS battery management module, a plurality of full-isolation direct current converters DC-DC1～DC-DCNAnd each full-isolation direct current converter is connected with each battery cell monomer in a one-to-one correspondence manner and is used for charging the battery cell monomers.
And the BMS battery management module is used for detecting the voltage of each battery cell, and actively starting the full-isolation direct-current converter to charge the battery cell with low voltage when the BMS battery management module detects that the voltage of the battery cell drops faster than that of other battery cells. The BMS battery management module comprises a battery sampling chip IC1 and an MCU control chip IC2, wherein the battery sampling chip IC1 is used for collecting the voltage of a single battery cell and transmitting the state information of the lithium battery pack to the MCU control chip IC 2. Each full-isolation direct current converter comprises a standby zero-loss circuit, a PWM chip and an isolation transformer, when a battery sampling chip acquires that the voltage of a single battery cell drops faster than that of other battery cells, the MCU control chip outputs a charging signal to the standby zero-loss circuit, then the standby zero-loss circuit outputs the charging signal to enable the PWM chip to supply power, and then the PWM chip outputs a driving signal to start the isolation transformer to charge the single battery cell.
Every full isolation direct current converter still includes primary level and secondary isolation feedback opto-coupler, rectifier diode, absorption circuit and output steady voltage feedback diode, primary level keep apart feedback opto-coupler with the PWM chip is connected, rectifier diode has two, its with absorption circuit respectively in isolation transformer connects. Taking the first full-isolation dc converter as an example, the full-isolation dc converter further includes a primary-secondary isolation feedback optocoupler U3, a rectifier diode D1, an absorption circuit D2, C2, R2, and an output voltage stabilization feedback diode D4, the primary-secondary isolation feedback optocoupler U3 is connected to the PWM U2 chip, and the rectifier diode has two D1 and D3 connected to the absorption circuits D2, C2, and R2 respectively connected to the isolation transformer T1.
The standby zero-loss circuit comprises an optocoupler, a triode electrically connected with the optocoupler, a front end resistor and a rear end resistor, wherein the front end resistor is connected to the output end of the optocoupler and between the base electrodes of the triode, the rear end resistor is connected between the base electrode and the emitting electrode of the triode, and the collecting electrode of the triode is connected with the PWM chip.
With one of the standby zero loss circuits: for example, the first standby zero-loss circuit includes a first optocoupler U1, a first transistor Q1 electrically connected to the first optocoupler, a third resistor R3 (i.e., a front end resistor), and a fifth resistor R5 (i.e., a rear end resistor), where the third resistor is connected between the output end of the first optocoupler and the base of the first transistor, the fifth resistor is connected between the base and the emitter of the first transistor, and the collector of the first transistor is connected to the first PWM chip. With one of the absorption circuits: the first absorption circuit includes, for example, a second resistor R2, a second diode D2, and a second capacitor C2.
The working principle of the utility model is as follows: when charging, BMS battery management system feeds back to the singlechip according to the monomer electric core voltage that detects. If the second cell voltage is lower than the highest cell voltage, the BMS battery management system S2 outputs a high level to the S2 pin of the DC-DC2 to start the DC-DC2 to operate for BATT2And charging to achieve the purpose of active charging equalization control, wherein other battery cells are simultaneously charged when the charging voltage is lower. And the BMS battery management system feeds back the detected voltage of the single battery cell to the single chip microcomputer during discharging. If the first cell voltage is lower than the highest cell voltage, the BMS battery management system S1 outputs a high level to the S1 pin of the DC-DC1 to start the DC-DC1 to operate for BATT1And charging to achieve the purpose of active discharge equalization control, wherein other battery cells are simultaneously charged when the discharge voltage is lower.
The control method of the active equalization control system of the energy storage battery comprises two methods:
BMS battery management module monitors BATTs of each battery in battery pack1～BATTNThe real-time voltage of each cell is V1～VNSelecting a cell with a high cell voltage as a reference cell with a voltage value VmaxAll of low cell voltages are VminAnd setting a rated differential pressure value VEWhen V ismax- Vmin＞VEThe BMS battery management module controls the full-isolation direct-current converter to carry out equalizing charge on the battery core with low BATT voltage until the voltage is consistent, and the BATT V isminOne or more cells. I.e. voltage below VmaxThe cells are compared with the highest voltage cell one by one, and when the voltage difference between any one or more cells and the highest cell exceeds VEAnd charging the one or more cells.
(II) BMS Battery management Module monitoring Battery BATT in Battery pack1～BATTNAnd collecting each cell voltage V at intervals of time T1～VNAnd calculating the voltage drop of each cell in T time as V1～VNCalculate VmaxAnd VminSet rated voltage drop to VeWhen V ismax-Vmin＞VeIf BMS battery management module controls full-isolation DC converter to BATT VminAnd performing equalizing charging on the battery cell until the voltage is consistent with other battery cells.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (5)
1. An energy storage battery active equalization control system, comprising: the lithium battery pack comprises a plurality of battery cell monomers; a BMS battery management module; the method is characterized in that:
the control system also comprises a plurality of full-isolation direct current converters, each full-isolation direct current converter is connected with each battery cell monomer in a one-to-one correspondence manner and is used for charging the battery cell monomers,
and the BMS battery management module is used for detecting the voltage of each battery cell, and actively starting the full-isolation direct-current converter to charge the battery cell with low voltage when the BMS battery management module detects that the voltage of the battery cell drops faster than that of other battery cells.
2. The active energy storage battery equalization control system of claim 1, wherein: the BMS battery management module comprises a battery sampling chip and an MCU control chip, wherein the battery sampling chip is used for collecting the voltage of a single battery cell and transmitting the state information of the lithium battery pack to the MCU control chip.
3. The active energy storage battery equalization control system of claim 2, wherein: each full-isolation direct current converter comprises a standby zero-loss circuit, a PWM chip and an isolation transformer,
when the battery sampling chip acquires that the voltage of the battery cell monomer drops faster than that of other battery cells, the MCU control chip outputs a charging signal to the standby zero-loss circuit, the standby zero-loss circuit outputs the charging signal to start the PWM chip to supply power, and then the PWM chip outputs a driving signal to start the isolation transformer to charge the battery cell monomer.
4. The active energy storage battery equalization control system of claim 3, wherein: each full-isolation direct current converter further comprises a primary isolation feedback optocoupler, a rectifier diode, an absorption circuit and an output voltage stabilization feedback diode, wherein the primary isolation feedback optocoupler and the secondary isolation feedback optocoupler are electrically connected with the PWM chip, and the number of the rectifier diodes is two, and the rectifier diodes and the absorption circuit are respectively connected with the isolation transformer.
5. The active energy storage battery equalization control system of claim 3, wherein: the standby zero-loss circuit comprises an optocoupler, a triode connected with the optocoupler, a front end resistor and a rear end resistor, wherein the front end resistor is connected with the output end of the optocoupler and between the base electrodes of the triode, the rear end resistor is connected between the base electrode and the emitting electrode of the triode, and the collecting electrode of the triode is connected with the PWM chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020535547.2U CN211579660U (en) | 2020-04-13 | 2020-04-13 | Active equalization control system for energy storage battery |
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| CN202020535547.2U CN211579660U (en) | 2020-04-13 | 2020-04-13 | Active equalization control system for energy storage battery |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112994170A (en) * | 2021-03-26 | 2021-06-18 | 浙江高泰昊能科技有限公司 | BMS active equalization circuit and working method thereof |
| CN116799915A (en) * | 2023-06-29 | 2023-09-22 | 航天锂电科技(江苏)有限公司 | Voltage reduction equalization circuit of lithium battery pack and control method thereof |
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2020
- 2020-04-13 CN CN202020535547.2U patent/CN211579660U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112994170A (en) * | 2021-03-26 | 2021-06-18 | 浙江高泰昊能科技有限公司 | BMS active equalization circuit and working method thereof |
| CN116799915A (en) * | 2023-06-29 | 2023-09-22 | 航天锂电科技(江苏)有限公司 | Voltage reduction equalization circuit of lithium battery pack and control method thereof |
| CN116799915B (en) * | 2023-06-29 | 2023-12-29 | 航天锂电科技(江苏)有限公司 | Voltage reduction equalization circuit of lithium battery pack and control method thereof |
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Effective date of registration: 20220707 Address after: 215600 No. 333 Fumin Middle Road, Tangqiao town, Zhangjiagang City, Suzhou City, Jiangsu Province Patentee after: Suzhou sol Zhixing New Energy Technology Co.,Ltd. Address before: 333 Fumin Middle Road, Tangqiao town, Zhangjiagang City, Suzhou City, Jiangsu Province Patentee before: JIANGSU SOUL NEW ENERGY TECHNOLOGY Co.,Ltd. |
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