CN109273788B - Energy feedback type lithium power battery serial formation and capacity separation device - Google Patents
Energy feedback type lithium power battery serial formation and capacity separation device Download PDFInfo
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- CN109273788B CN109273788B CN201811262126.0A CN201811262126A CN109273788B CN 109273788 B CN109273788 B CN 109273788B CN 201811262126 A CN201811262126 A CN 201811262126A CN 109273788 B CN109273788 B CN 109273788B
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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
- H01M10/44—Methods for charging or discharging
- H01M10/446—Initial charging measures
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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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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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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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The invention discloses an energy feedback type lithium power battery serial formation component device which comprises a main loop and a control circuit, wherein the main loop circuit comprises an AC/DC module, i single power batteries, i serial dual-mode switches and i bypass dual-mode switches, the i single power batteries are serially connected with the respective serial dual-mode switches in sequence and then serially connected to the anode and the cathode of the AC/DC power module, the anodes of the single power batteries are serially connected with serial dual-mode switches, and the serial dual-mode switches and the bypass dual-mode switches are formed by serially connecting two groups of MOSFET units. The other end of the series connection bimodal switch and the negative end of the single power battery are both connected with a bypass bimodal switch in parallel, and the two ends of the single power battery and the two ends of the series connection bimodal switch are connected with a control circuit through a circuit. The invention can realize serial formation or capacity division of 128 batteries at most. In the charge and discharge process of serial formation or capacity division, the invention can not influence the normal operation of other batteries when the input or the withdrawal of one battery is carried out under the condition that the current is not interrupted.
Description
Technical Field
The invention relates to a power battery formation and capacity division technology, in particular to an energy feedback type lithium power battery formation device.
Background
Lithium power batteries are new high-energy batteries that have been successfully developed in the 20 th century. The battery has the advantages of high energy, high battery voltage, wide working temperature, long storage life and the like, and has been widely used.
After the battery is manufactured, the internal positive and negative electrode substances are activated by a certain charge and discharge mode, and the process of improving the charge and discharge performance and the comprehensive performance of self-discharge, storage and the like of the battery is called formation. The formation of the lithium power battery is to form a passivation film on the surface of graphite by the lithium power battery and EC or DMC solvent, trace water, hydrofluoric acid HF and the like in the first charge and discharge process, and the passivation film is a multi-empty layer containing high polymer and inorganic salt, which is called SEI film. The quality of the SEI film directly influences the electrochemical properties of the battery such as cycle life, stability, self-discharge property, safety and the like.
The traditional formation method adopts a battery channel of a power battery detection device to form the single battery, namely one battery occupies a charging channel, and the large-scale formation process has more formation devices and large occupied area. The method can not completely coincide with the output current precision of different battery channels, so that the final formation effect of the battery can not completely coincide.
Disclosure of Invention
The invention provides an energy feedback type lithium power battery serial formation and capacity separation device, which aims to reduce the number of equipment used in the lithium power battery batch formation or capacity separation process and improve the consistency of formed or capacity separated products.
The invention adopts a series formation technology, and improves the consistency of batteries while reducing the number of formation cabinets. The power supply comprises a main loop circuit and a control circuit, wherein the main loop circuit comprises an AC/DC module, i single power batteries, i series connection bimodal switches and i bypass bimodal switches;
i single power batteries are connected with respective series-connection double-mode switches in series and then sequentially connected with the anode and the cathode of the AC/DC power supply module in series, one end of each series-connection double-mode switch is connected with the anode of the corresponding single power battery in series, and the bypass double-mode switch is connected with the other end of each series-connection double-mode switch and the negative end of the single power battery in parallel;
The bimodal bidirectional switch provided by the invention is provided with A, B two control poles, and 4 states of bidirectional conduction, bidirectional cut-off, forward continuous flow reverse cut-off and reverse continuous flow forward cut-off can be realized by controlling A, B two control poles.
The two ends of the single power battery and the two ends of the serial dual-mode switch are electrically connected with the control circuit, and the control circuit is used for collecting the voltage of the single power battery and the voltage of the two ends of the serial dual-mode switch in real time so as to complete fault judgment on the working state of the single power battery and logic processing and interlocking of switch control signals.
The control circuit receives the battery voltage and the voltage information of the series-connection bimodal switch, performs fault judgment and control on the working state of the battery, performs logic processing and interlocking processing on signals, drives the series-connection bimodal switch and the bypass bimodal switch, ensures reliable triggering of the series-connection bimodal switch and the bypass bimodal switch, does not cause short circuit of the anode and the cathode of the power battery, and realizes input and exit of the series-connection formed single power battery by performing on and off control on each switch of the series-connection bimodal switch and the bypass bimodal switch. In the process of serial formation or capacity division, under the condition of ensuring that the current is not interrupted, the input or the withdrawal of one battery can not influence the normal operation of other batteries.
The invention can also be optimized and improved as follows:
The series connection bimodal switch and the bypass bimodal switch are formed by connecting two groups of MOSFET units in series, each group of MOSFET units comprises a parallel connection series, the parallel connection series comprises a MOSFET (metal-oxide-semiconductor field effect transistor) or at least two MOSFETs which are connected in parallel, and a common source or a common drain of the parallel connection series of the series connection bimodal switch or the bypass bimodal switch is formed.
The main loop of the invention can perform the serial formation of more than 3 lithium power batteries at one time, and can be expanded to the serial formation of 128 power batteries at most, namely, i is more than or equal to 3 and less than or equal to 128, thereby improving the utilization rate of equipment.
The series dual-mode switch or the bypass dual-mode switch is arranged on a PCB, and the base material of the PCB is wave fiber cloth, aluminum or ceramic.
Preferably, the input voltage of the AC/DC power supply module is 380V, the output voltage is 0-500V, and the output current is 0-150A of adjustable constant current.
The invention has the following advantages:
1. the invention adopts serial formation, so that the consistency of formation effect is easier to ensure. The series circuit can realize the series formation of 128 lithium power batteries at maximum through 4 control states of bidirectional conduction, bidirectional cutoff, forward continuous flow reverse cutoff and reverse continuous flow forward cutoff, thereby reducing the number of equipment used in the formation process of a large number of batteries, reducing the occupied area of equipment in the formation process, and further being beneficial to improving the production capacity and saving the production cost.
2. In the discharging process, the invention feeds the battery energy back to the power grid, thereby remarkably saving the electric energy.
3. In the formation process of all lithium power batteries connected in series by the device, a certain battery can be put into or withdrawn from under the condition that current is not interrupted, and normal operation is not influenced.
Drawings
The invention is described in further detail below with reference to the attached drawings and to specific examples:
FIG. 1 is a schematic diagram of a main circuit of an energy feedback type lithium power battery in series connection of the batteries of the capacity-dividing device;
FIG. 2 is a schematic diagram of a bimodal switch main circuit composed of common source MOSFET units of an energy feedback type lithium power battery serial formation and capacity division device;
FIG. 3 is a schematic diagram of a bimodal switch main circuit composed of common drain MOSFET units of an energy feedback type lithium power battery of the invention;
FIG. 4 shows a first state of charge exiting switching of a series formation battery of an energy feedback type lithium power battery and a series formation battery of a capacity division device according to the present invention;
FIG. 5 shows a second switching state of the energy feedback type lithium power battery serial formation and capacity division device serial formation battery charging exit;
FIG. 6 shows a first switching state of the energy feedback type lithium power battery serial formation and capacity division device serial formation battery discharge exit;
FIG. 7 shows a second switching state of the energy feedback type lithium power battery serial formation and the capacity division device serial formation battery discharge exit;
FIG. 8 shows a third switching state of the energy feedback type lithium power battery serial formation and the capacity division device serial formation battery discharge exit;
fig. 9 is a schematic diagram of a control circuit of a serial formation and capacity division device of an energy feedback type lithium power battery of the present invention.
Detailed Description
The series dual-mode switch and the bypass dual-mode switch of fig. 2 are both common sources, and the series dual-mode switch and the bypass dual-mode switch of fig. 3 are both common drains. Taking a MOSFET unit of a common source as an example, accessing the common source into a main loop circuit as shown in fig. 1, wherein a1 st group of common source MOSFET units are formed by a field effect transistor Q_11 and a field effect transistor Q_12 to serve as a series connection dual-mode switch, a1 st group of bypass dual-mode switches are formed by a field effect transistor Q_13 and a field effect transistor Q_14, and a lithium power battery BT_1 is a1 st power battery; the field effect tube Q_21 and the field effect tube Q_22 form a group 2 common source MOSFET group to be used as a series connection bimodal switch, and the field effect tube Q_23 and the field effect tube Q_24 form a group 2 bypass bimodal switch. The lithium power battery BT_2 is a No. 2 power battery. The numbers of other batteries and field effect transistors are analogized in sequence, and N groups of lithium power batteries are connected in series together to form the battery.
The series connection bimodal switch and the bypass bimodal switch are arranged on the PCB, and the base material of the PCB is wave fiber cloth, aluminum or ceramic. As a preferred embodiment, the input voltage of the AC/DC power supply module is three-phase alternating current 380V, the output voltage is 0-500V, and the output current is an adjustable constant current of 0-150A. The input of the AC/DC power supply module can be single-phase alternating current, the output voltage is direct current, and the constant voltage and constant current regulation mode is provided. The capacity may be configured according to the capacity of the battery in series.
As shown in fig. 1, the negative electrode of the lithium power battery bt_1 is connected to the negative electrode of the serial formation power supply, that is, the AC/DC power supply module, the positive electrode of the lithium power battery bt_1 is connected in series with the drain electrode of the field effect transistor q_11, the source electrode of the field effect transistor q_11 is connected in series with the source electrode of the field effect transistor q_12, a field effect transistor Q13 and a field effect transistor Q14 of a bypass dual-mode switch are connected in parallel between the drain electrode of the field effect transistor q_12 and the negative electrode of the serial formation power supply (also the negative electrode of bt_1), the drain electrode of the field effect transistor q_12 is connected with the drain electrode of the field effect transistor q_14, and the drain electrode of the field effect transistor Q13 is connected with the negative electrode of the serial formation power supply; the cathode of the lithium power battery BT_2 is connected to the drain electrode of the field effect transistor Q_12, the anode of the lithium power battery BT_2 is connected in series with the drain electrode of the field effect transistor Q_21, the source electrode of the field effect transistor Q_21 is connected in series with the source electrode of the field effect transistor Q_22, a field effect transistor Q23 and a field effect transistor Q24 of a bypass dual-mode switch are connected in parallel between the drain electrode of the field effect transistor Q_22 and the cathode of the lithium power battery BT_2, the drain electrode of the field effect transistor Q_22 is connected with the drain electrode of the field effect transistor Q_24, and the drain electrode of the field effect transistor Q23 is connected with the cathode of the lithium power battery BT_2; and the other steps are that the cathode of the lithium power battery BT_N is connected with the drain electrode of the field effect tube Q (N-1) 2, the anode of the lithium power battery BT_N is connected with the drain electrode of the field effect tube Q_N1 in series, the source electrode of the field effect tube Q_N1 is connected with the source electrode of the field effect tube Q_N2 in series, a field effect transistor Q_N3 and a field effect transistor Q_N4 of a bypass bimodal switch are connected in parallel between the drain electrode of the field effect tube Q_N2 and the cathode of the lithium power battery BT_N in series, the drain electrode of the field effect tube Q_N2 is connected with the drain electrode of the field effect tube Q_N4 and is connected with the anode of a serially connected power supply, and the drain electrode of the field effect tube Q_N3 is connected with the cathode of the lithium power battery BT_N; the main loop realizes the formation of N batteries in series, and the maximum number of the batteries in series can reach 128.
The process of battery serial formation is the process of charging and discharging the batteries. Under normal working conditions, the series connection bimodal switches are all turned on, the series connection formation power supply current charges the series connection batteries through the series connection bimodal switches, the bypass bimodal switches are all turned off, the black thickened line in fig. 1 is the current trend, and the current direction is from top to bottom.
When one power battery is full or fails and needs to be out of the series formation, the invention can realize that the battery is out of the series formation while other power batteries keep the normal series formation working state, namely, the current of other power batteries is not interrupted in the process of the battery out. Taking lithium-powered battery bt_1 as an example to illustrate battery exit, fig. 4 and 5 are the entire switching process. In fig. 4, when the lithium power battery bt_1 needs to exit the series formation, the field effect transistor q_11 is first turned off, the current flows through the body diode of the field effect transistor q_11, then the field effect transistor q_13 and the field effect transistor q_14 bypassing the bimodal switch are turned on, the field effect transistor q_13 and the field effect transistor q_14 are turned on, the q_12 is turned off, the series formation current flows in from the drain of the field effect transistor q_14, and flows out from the drain of the field effect transistor q_13, and other battery currents are continuous and remain unchanged except for the lithium power battery bt_1. Because the field effect transistor Q_11 is disconnected, the cathode of the body diode of the field effect transistor Q_11 is connected with the anode of the lithium power battery BT_1, the blocking effect on the battery charging current is achieved, and the two ends of the lithium power battery BT_1 are not short-circuited after the field effect transistor Q_13 and the field effect transistor Q14 are connected.
When the lithium power battery BT_1 needs to be put into the series formation again, the invention can be realized by the following steps: before the lithium power battery BT_1 is put into operation, the field effect transistor Q_13 and the field effect transistor Q_14 are connected, and the field effect transistor Q_11 and the field effect transistor Q_12 are disconnected; firstly, a field effect transistor Q_12 is turned on, then the field effect transistor Q_12 is turned on, and then the field effect transistor Q_14 is turned off, so that a charging current formed by series connection charges a lithium power battery BT_1 through body diodes of the field effect transistor Q_12 and the field effect transistor Q_11, and then the field effect transistor Q_11 is turned on, and other power battery currents are continuous and unchanged.
The energy stored by the battery can be fed back to the power grid through the series formation device, and the main loop in the feedback process is shown in fig. 1, and the direction of current is from bottom to top. During the discharging process of the battery, when one battery fails or reaches the cut-off voltage and the serial formation is needed to be withdrawn, the working process is as follows:
Taking lithium power battery BT_1 as an example, during normal series discharge, field effect transistor Q_11 and field effect transistor Q_12 are both connected, and field effect transistor Q_13 and field effect transistor Q14 are disconnected. When the lithium power battery bt_1 fails or the discharge reaches the cut-off voltage, the lithium power battery bt_1 needs to be withdrawn from the series formation circuit. First, the fet q_12 is turned off, and the battery discharge current flows from the body diode of the fet q_12, as shown in fig. 6, with the current direction from bottom to top. Then, the fet q_13 is turned on, and the discharge current flows from the fet q_13 to the body diode of the fet q_14, as shown in fig. 7, from bottom to top. The fet q_11 is turned off and then the fet q_14 is turned on, and the discharge current flows from the fet q_13 to the fet q_14, as shown in fig. 8, with the current direction from bottom to top.
The principle of the control circuit is shown in fig. 9, the voltage acquisition system sends the acquired information such as the battery voltage, the series connection bimodal switching voltage and the like to the microprocessor control system, and the voltage acquisition system can adopt a special AD chip to meet the requirement of serial formation of at most 128 single batteries.
The microprocessor control system is used for receiving the battery voltage, the series connection bimodal switch voltage, overvoltage, undervoltage, overheat and other fault information acquired by the voltage acquisition system, carrying out fault judgment and control on the working state of the battery according to the received information, carrying out logic processing and interlocking on control signals, ensuring reliable triggering of the series connection bimodal switch and the parallel connection bimodal switch, avoiding short circuit of the power battery, and realizing input and exit of the series connection formed single power battery through switching on and off the series connection bimodal switch and the bypass bimodal switch.
The embodiments of the present invention are not limited to the above embodiments, for example, the series bimodal switch and the bypass bimodal switch of the present invention are not limited to the common source, the common drain of the present case, and may be other similar type switches. Including the form of multiple MOSFETs in parallel under high current conditions. In general, the present invention is not limited to the above embodiments, and various other modifications, substitutions, and alterations can be made to the above structures of the present invention without departing from the basic technical spirit of the present invention, and according to the above disclosure and the common knowledge and conventional means in the art, all fall within the scope of the present invention.
Claims (4)
1. The energy feedback type lithium power battery serial formation and capacity division device comprises a main loop circuit and a control circuit, and is characterized in that the main loop circuit comprises an AC/DC module, i single power batteries, i serial dual-mode switches and i bypass dual-mode switches;
i single power batteries are connected with respective series-connection double-mode switches in series and then sequentially connected with the anode and the cathode of the AC/DC power supply module in series, one end of each series-connection double-mode switch is connected with the anode of the corresponding single power battery in series, and the bypass double-mode switch is connected with the other end of each series-connection double-mode switch and the negative end of the single power battery in parallel;
the control circuit is used for collecting the voltage of the single power battery and the voltage of the two ends of the serial bimodal switch in real time so as to finish fault judgment on the working state of the single power battery and logic processing and interlocking of switch control signals;
The series connection bimodal switch and the bypass bimodal switch are formed by connecting two groups of MOSFET units in series, each group of MOSFET units comprises a parallel connection series, the parallel connection series comprises a MOSFET (metal oxide semiconductor field effect transistor) or at least two MOSFETs which are connected in parallel, and the parallel connection series of the series connection bimodal switch or the bypass bimodal switch is common-source or common-drain, wherein the two groups of MOSFET units connected in series are common-source or common-drain, and the two groups of MOSFET units connected in series with the common-source or the common-drain are N-MOS or P-MOS.
2. The energy feedback type lithium power battery serial formation and capacity division device according to claim 1, wherein i is more than or equal to 3 and less than or equal to 128.
3. The energy feedback type lithium power battery serial formation and capacity division device according to claim 1 or 2, wherein the serial dual-mode switch or the bypass dual-mode switch is arranged on a PCB, and a base material of the PCB is a wave fiber cloth, aluminum or ceramic.
4. The energy feedback type lithium power battery serial formation and capacity division device according to claim 1 or 2, wherein the input current of the AC/DC power supply module is three-phase or single-phase alternating current, the output voltage is direct current, and a constant voltage and constant current regulation mode is provided.
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| CN110474118B (en) * | 2019-07-09 | 2023-01-10 | 福建星云电子股份有限公司 | Energy feedback type battery cell series formation and capacity grading test system and method |
| CN111276765A (en) * | 2020-03-12 | 2020-06-12 | 姜家刚 | Cell capacity dividing device and equipment |
| CN113937378B (en) * | 2020-07-13 | 2022-10-18 | 珠海泰坦新动力电子有限公司 | serialization system |
| CN112151892B (en) * | 2020-09-25 | 2021-11-05 | 武汉德普新源科技有限公司 | Energy feedback type single battery series charging and discharging detection system and implementation method |
| CN112271777B (en) * | 2020-10-27 | 2022-07-01 | 东莞光亚智能科技有限公司 | Series battery monomer constant voltage circuit and control method thereof |
| CN112259815B (en) * | 2020-11-09 | 2024-10-18 | 深圳鼎阳智能电气有限公司 | Battery switching circuit and device in battery serial formation and capacity division system |
| CN112737041A (en) * | 2020-12-31 | 2021-04-30 | 陈玥 | Battery series charging and discharging circuit and charging and discharging control method |
| CN112820962B (en) * | 2021-01-07 | 2022-02-22 | 广州擎天实业有限公司 | Constant voltage control method and system for lithium ion power battery series component capacity |
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