CN213906363U - Battery series connection charging and discharging circuit - Google Patents
Battery series connection charging and discharging circuit Download PDFInfo
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- CN213906363U CN213906363U CN202023317938.6U CN202023317938U CN213906363U CN 213906363 U CN213906363 U CN 213906363U CN 202023317938 U CN202023317938 U CN 202023317938U CN 213906363 U CN213906363 U CN 213906363U
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Abstract
The embodiment of the utility model discloses battery series connection charging and discharging circuit, include: the system comprises a rectification inverter power supply and N battery units; each battery unit comprises a single battery, a single-pole double-throw relay and a follow current unit; the normally closed end of the single-pole double-throw relay is connected with the positive electrode of the battery, and the normally open end of the single-pole double-throw relay is connected with the negative electrode of the battery; the follow current unit is connected in parallel and bypasses the common end and the normally open end of the single-pole double-throw relay; the N battery units are connected in series through the common end of the single-pole double-throw relay and are connected with a rectification inverter power supply to form a series charging and discharging circuit. When the battery is charged and discharged, the battery can be withdrawn or put into a certain battery through the switching between the normally closed end and the normally open end of the single-pole double-throw relay. In the process of withdrawing or throwing a certain battery, the current of the main circuit cannot be interrupted due to the follow current effect of the follow current unit, so that the monomer battery is withdrawn or thrown in the charging and discharging process without influencing the normal charging and discharging work of other batteries, the operation is simple and convenient, and the equipment cost is low.
Description
Technical Field
The utility model relates to a battery charge-discharge technical field, concretely relates to battery series connection charge-discharge circuit.
Background
The circuit design refers to designing a circuit system meeting the use requirement by using a specific method according to a certain rule. In battery energy storage power stations and battery production enterprises, charging and discharging operations are required for a large number of batteries. The common battery charging and discharging connection circuit has two modes, namely a single battery charging and discharging mode in which one battery corresponds to one charging and discharging channel and a battery series charging and discharging mode in which a plurality of batteries are connected in series and then connected with one charging and discharging channel.
The problems of more equipment, large investment and large energy consumption exist in a single battery charging and discharging mode; the serial charging and discharging can greatly save equipment investment and reduce production energy consumption, but increases the difficulty of process management, and particularly solves the problem that the single battery finishes charging and discharging or breaks down in the charging and discharging process on the premise of not interrupting the current of a main loop.
In the process of charging and discharging the batteries in series, when the conditions of a certain single battery, the charging voltage reaching the highest charging voltage, the discharging voltage reaching the lowest discharging voltage and the like occur, the battery needs to exit the circuit. Therefore, the key problem that the circuit needs to solve is how to realize the exit of the single battery in the charging and discharging process, and the normal charging and discharging work of other batteries is not influenced, and the main charging and discharging loop is not broken or the battery is not short-circuited.
SUMMERY OF THE UTILITY MODEL
Because there is above-mentioned problem in current method, the embodiment of the utility model provides a battery series connection charging and discharging circuit.
Specifically, the embodiment of the utility model provides a following technical scheme:
in a first aspect, an embodiment of the present invention provides a battery series charging and discharging circuit, including: the system comprises a rectification inverter power supply and N battery units, wherein N is more than or equal to 2;
each battery unit comprises a single battery, a single-pole double-throw relay and a follow current unit; the normally closed end of the single-pole double-throw relay is connected with the anode of the single battery, and the normally open end of the single-pole double-throw relay is connected with the cathode of the single battery; the follow current unit is connected with a bypass in parallel at the common end and the normally open end of the single-pole double-throw relay; the suppression voltage of the follow current unit is higher than the highest charge-discharge voltage of the single battery, and the follow current unit is in a reverse blocking state when the single battery is charged and discharged;
the public end of the single-pole double-throw relay in each battery unit is connected with the negative electrode of the single battery in the previous battery unit, the negative electrode of the single battery in each battery unit is connected with the public end of the single-pole double-throw relay in the next battery unit, and the N battery units are sequentially connected in series and connected with the rectification inverter power supply to form a series charging and discharging circuit.
Further, the freewheeling unit is a Transient Voltage Suppressor (TVS) tube.
Further, the free-wheeling unit is a circuit formed by combining diodes and having TVS tube characteristics.
Further, the single-pole double-throw relay is replaced by a single-pole double-throw switch; or, the single-pole double-throw relay is replaced by two single-pole switches; or the single-pole double-throw relay is replaced by two single-pole relays.
Furthermore, the single battery is a single battery or a single battery pack.
Furthermore, the single battery is a single battery with or without a voltage protection function.
Further, the method also comprises the following steps: a control circuit; one end of the control circuit is connected with the N battery units, the other end of the control circuit is connected with the rectification inverter power supply, and the control circuit is used for detecting state parameters of the battery units, controlling the exit and the input of the battery units and adjusting the rectification inverter power supply.
Furthermore, the control circuit is used for acquiring working parameters of corresponding single batteries in the N battery units.
Further, the operating parameters of the single battery comprise: one or more of a charging voltage, a charging current, a discharging voltage, a discharging current, a battery temperature, a charging period, a discharging period, and a current of the freewheel unit.
Further, the working modes of the rectification inverter power supply comprise a rectification mode and an inversion mode.
According to the technical solution provided by the utility model, the embodiment of the utility model provides a pair of battery series connection charging and discharging circuit, including rectification invertion power supply and two at least battery units, and every battery unit includes battery cell, single-pole double-throw relay and afterflow unit, and the normally closed end of single-pole double-throw relay links to each other with battery cell's positive pole, and the normally open end links to each other with battery cell's negative pole to with the parallelly connected bypass of afterflow unit in the common terminal and the normally open end of single-pole double-throw relay. The common end of the single-pole double-throw relay in each battery unit is connected with the negative electrode of the single battery in the previous battery unit, the negative electrode of the single battery in each battery unit is connected with the common end of the single-pole double-throw relay in the next battery unit, and the N battery units are sequentially connected in series and connected with the rectification inverter power supply to form a series charging and discharging circuit. When the battery is charged and discharged, the single battery is connected with the rectification inverter power supply after being connected in series through the normally closed end of the single-pole double-throw relay, and the bypass of the follow current unit cannot influence the charging and discharging main loop because the suppression voltage of the follow current unit is higher than the charging and discharging voltage of the single battery. When the battery finishes charging and discharging and needs to be withdrawn, in the transient process that the single battery withdraws from the main loop to the normally open end of the single-pole double-throw relay and the current passes through the main loop, the current of the main loop flows through the follow current unit, and the follow current unit plays a role in follow current, so that the current of the main loop is not interrupted. In addition, when the normally open end of the single-pole double-throw relay is closed, the bypass short circuit effect is achieved on the follow current unit, so that the conduction time of the follow current unit is shortened, the loss is reduced, and the hardware requirement on a follow current unit device is lowered. Therefore, the embodiment of the utility model provides a low-loss circuit for battery series connection charge-discharge for the normal charge-discharge work that withdraws from or drops into and do not influence other batteries of battery among the charge-discharge process has been realized to the multi-cell series connection charge, discharges, and easy operation can prevent the maloperation, has solved the complicated, easy maloperation of control, the big scheduling problem of loss that present battery series connection charge-discharge circuit exists.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of a battery series charging/discharging circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a follow current circuit when a battery cell is charged or discharged and withdrawn in a battery series charging/discharging circuit according to an embodiment of the present invention, and a single-pole double-throw relay has not yet completed switching;
fig. 3 is a schematic circuit diagram of a battery series charging/discharging circuit according to an embodiment of the present invention after a certain battery unit completes charging or discharging and exits, and a single-pole double-throw relay completes switching;
fig. 4 is a schematic diagram illustrating a TVS tube being used as a freewheeling unit of a battery series charging/discharging circuit according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a current follow unit of a battery series charging/discharging circuit according to an embodiment of the present invention, which is formed by combining diodes and has TVS transistor characteristics;
fig. 6 is an exemplary diagram of a battery series charging and discharging circuit according to an embodiment of the present invention, in which a freewheeling unit is designed with a diode and a thyristor;
fig. 7 is an exemplary diagram illustrating a manner of changing connection between a follow current unit and a relay in a battery series charging/discharging circuit according to an embodiment of the present invention;
fig. 8 is a flowchart illustrating a battery series charging/discharging control method based on a battery series charging/discharging circuit according to an embodiment of the present invention.
Detailed Description
The following describes the present invention with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Fig. 1 shows the utility model provides a schematic diagram of battery series charging and discharging circuit, fig. 2 is that the utility model relates to an embodiment provides a battery series charging and discharging circuit accomplishes charging or discharging and withdraws from at certain battery cell, and follow current circuit schematic diagram when single-pole double-throw relay has not accomplished the switching yet, and fig. 3 is that an embodiment provides a battery series charging and discharging circuit accomplishes charging or discharging and withdraws from at certain battery cell, and the circuit schematic diagram after single-pole double-throw relay accomplishes the switching. The battery series charging and discharging circuit provided by the embodiment of the present invention is explained and explained in detail with reference to fig. 1, fig. 2 and fig. 3. As shown in fig. 1, in the drawing, 1 denotes a single battery, 2 denotes a single-pole double-throw relay, 3 denotes a flywheel unit, 4 denotes a rectification inverter power supply, 5 denotes a control circuit, and 6 denotes a battery unit. The embodiment of the utility model provides a pair of battery series connection charging and discharging circuit, include: a rectification inverter power supply 4 and N battery units 6, wherein N is more than or equal to 2;
each battery unit 6 comprises a single battery 1, a single-pole double-throw relay 2 and a follow current unit 3; the normally closed end of the single-pole double-throw relay 2 is connected with the anode of the single battery 1, and the normally open end of the single-pole double-throw relay 2 is connected with the cathode of the single battery 1; the follow current unit 3 is connected in parallel and bypasses the common end and the normally open end of the single-pole double-throw relay 2; wherein, the suppression voltage of the follow current unit 3 is higher than the highest charge-discharge voltage of the single battery 1, and the follow current unit 3 is in a reverse blocking state when the single battery 1 is charged and discharged;
the common end of the single-pole double-throw relay 2 in each battery unit 6 is connected with the negative electrode of the single battery 1 in the previous battery unit 6, the negative electrode of the single battery 1 in each battery unit 6 is connected with the common end of the single-pole double-throw relay 2 of the next battery unit 6, and the N battery units 6 are sequentially connected in series and connected with the rectification inverter power supply 4 to form a series charging and discharging circuit.
In this embodiment, it should be noted that the circuit includes a rectification inverter power supply and at least two battery units, and each battery unit is composed of 1 battery cell, 1 single-pole double-throw relay, and 1 freewheeling unit. The normally closed end of the single-pole double-throw relay is connected with the anode of the single battery, and the normally open end of the single-pole double-throw relay is connected with the cathode of the single battery. The follow current unit is connected in parallel and bypasses the common end and the normally open end of the single-pole double-throw relay. The common terminal of the single-pole double-throw relay in the battery unit is connected with the negative terminal of the single battery in the previous battery unit, the negative terminal of the single battery is connected with the common terminal of the single-pole double-throw relay in the next battery unit, the N battery units are sequentially connected and are connected with the rectification inverter power supply to form an integral series charging and discharging main circuit, and because the suppression voltage of the follow current unit is higher than the charging and discharging voltage of the single battery, the follow current unit is in a reverse blocking state when the battery is charged and discharged, and the charging and discharging main circuit cannot be influenced. The single battery is communicated into a charging and discharging main loop through the normally closed end of the single-pole double-throw relay, so that the energy loss is low. When the single battery finishes charging and discharging and needs to be withdrawn, in the transient process that the single battery withdraws from the main loop to the normally open end of the single-pole double-throw relay and the current passes through the main loop, the current of the main loop flows through the follow current unit, and the follow current unit plays a follow current role, so that the current of the main loop is not interrupted. When the single battery has a voltage protection function, the follow current unit acts on the voltage protection function, and the single battery automatically follows current when in a high-impedance state; when the single battery does not have the voltage protection function, the control circuit controls the normally closed end of the single-pole double-throw relay to be disconnected so as to realize continuous current. The normally open end of the single-pole double-throw relay is closed to play a role of bypass short circuit for the follow current unit, so that the conduction time of the follow current unit is shortened, the loss is reduced, and the technical requirement on a follow current unit device is lowered.
In this embodiment, it should be noted that the connection mode of the freewheeling unit and the single-pole double-throw relay is not limited to the connection mode of the embodiment of the present invention, as shown in fig. 7, and other parallel connection modes may also be adopted, which are not specifically limited herein.
In this embodiment, can understand, the embodiment of the utility model provides a can realize when the battery is established ties and is discharged, no matter charging or in the discharge process, all can realize withdrawing from or drop into a certain battery through the switching between single-pole double-throw relay normally closed end and normally open end. When a certain battery is withdrawn or put into operation, the current of the main circuit cannot be interrupted due to the follow current function of the follow current unit, and the normal operation of other batteries is not influenced. Because the voltage drop of the relay closing contact is close to zero, the reverse leakage current of the follow current unit is extremely small, the follow current time is very short, and the additional loss of the circuit is very small.
According to the technical solution provided by the utility model, the embodiment of the utility model provides a pair of battery series connection charging and discharging circuit, including rectification invertion power supply and two at least battery units, and every battery unit includes battery cell, single-pole double-throw relay and afterflow unit, and the normally closed end of single-pole double-throw relay links to each other with battery cell's positive pole, and the normally open end links to each other with battery cell's negative pole to with the parallelly connected bypass of afterflow unit in the common terminal and the normally open end of single-pole double-throw relay. The common end of the single-pole double-throw relay in each battery unit is connected with the negative electrode of the single battery in the previous battery unit, the negative electrode of the single battery in each battery unit is connected with the common end of the single-pole double-throw relay in the next battery unit, and the N battery units are sequentially connected in series and connected with the rectification inverter power supply to form a series charging and discharging circuit. When the battery is charged and discharged, the single battery is connected with the rectification inverter power supply after being connected in series through the normally closed end of the single-pole double-throw relay, and the bypass of the follow current unit cannot influence the charging and discharging main loop because the suppression voltage of the follow current unit is higher than the charging and discharging voltage of the single battery. When the battery finishes charging and discharging and needs to be withdrawn, in the transient process that the single battery withdraws from the main loop to the normally open end of the single-pole double-throw relay and the current passes through the main loop, the current of the main loop flows through the follow current unit, and the follow current unit plays a role in follow current, so that the current of the main loop is not interrupted. In addition, when the normally open end of the single-pole double-throw relay is closed, the bypass short circuit effect is achieved on the follow current unit, so that the conduction time of the follow current unit is shortened, the loss is reduced, and the hardware requirement on a follow current unit device is lowered. Therefore, the embodiment of the utility model provides a low-loss circuit for battery series connection charge-discharge for the normal charge-discharge work that withdraws from or drops into and do not influence other batteries of battery among the charge-discharge process has been realized to the multi-cell series connection charge, discharges, and easy operation prevents the maloperation, has solved the complicated, easy maloperation of control, the big scheduling problem of loss that present battery series connection charge-discharge circuit exists. In addition, to the monocell charge-discharge mode that a current battery corresponds a charge-discharge channel, the embodiment of the utility model provides a battery series connection charge-discharge circuit can carry out the charge-discharge operation to the huge battery of quantity through a passageway, has avoided current monocell charge-discharge mode to have the problem that equipment is many, the investment is big, the energy consumption is big. It is therefore clear that the embodiment of the utility model provides a low-loss circuit for battery series connection charge-discharge has solved the problem that battery series connection charge-discharge in-process battery cell withdrawed from and drops into, has the equipment investment of saving, easy operation, prevents that maloperation, reduction loss etc. are showing the advantage in battery energy storage power station, battery production and battery performance detection technical field.
Based on the content of the above embodiments, in the present embodiment, the freewheel unit is a TVS tube.
In the present embodiment, as shown in fig. 4, 5 and 7, it is preferable that the freewheeling unit may adopt a transient Voltage suppressor tvs (transient Voltage super) transistor, the freewheeling unit has a diode conduction characteristic when a forward Voltage is applied, and the freewheeling unit conducts and maintains a suppression Voltage drop when an applied reverse Voltage exceeds its suppression Voltage. The embodiment of the utility model provides a follow current unit's the suppression voltage is a little higher than the maximum voltage that charges of monomer battery, and when battery charge-discharge, the follow current unit is in reverse blocking state.
Based on the content of the above embodiments, in the present embodiment, the freewheel unit is a circuit formed by combining diodes and having TVS transistor characteristics.
In this embodiment, it should be noted that when the single battery is charged and discharged and the normally closed end of the single-pole double-throw relay is closed (as shown in fig. 1), the single battery cannot be short-circuited by the follow current unit, and the suppression voltage of the follow current unit is slightly higher than the highest charging voltage of the single battery; after the single battery finishes charging and discharging, the main loop current is switched to the follow current unit, and the follow current unit is required to bear the main loop current in a short time, so that the follow current unit is not damaged before the normally-opened end of the single-pole double-throw relay is closed. According to the technical requirements of the follow current unit, a proper TVS tube (figure 4) or a circuit (figure 5) with TVS tube characteristics formed by combining diodes can be selected, the serial number of the diodes is determined according to the required suppression voltage and the on-state voltage drop of the diodes, and the high-current follow current unit can be obtained by combining the diodes. The TVS tube in the utility model can be replaced by a bidirectional TVS tube and a voltage stabilizing diode; a plurality of TVS tubes are connected in parallel to design a large-current follow current unit, or other electrical components are adopted to form a follow current unit with a similar function (figure 6).
Based on the content of the above embodiments, in this embodiment, the single-pole double-throw relay may be replaced by a single-pole double-throw switch; or, the single-pole double-throw relay can be replaced by two single-pole switches; or, the single-pole double-throw relay can be replaced by two single-pole relays.
In this embodiment, it is preferable that, in the battery series charging and discharging circuit provided in the embodiment of the present invention, the single-pole double-throw relay in the embodiment of the present invention may be replaced by a single-pole double-throw switch or two single-pole switches or two single-pole relays, and no specific limitation is made here.
Based on the content of the above embodiments, in this embodiment, the single battery is a single battery or a single battery pack.
In this embodiment, it should be noted that the battery cell may be 1 battery, or may be 1 battery pack, and is not limited herein.
Based on the content of the above embodiments, in the present embodiment, the single battery is a single battery with or without a voltage protection function.
In this embodiment, it should be noted that the single battery is a single battery with a voltage protection function, and when the charging of the single battery is completed, the single battery is in a high impedance state, at this time, the voltage at two ends of the single battery increases, and when the voltage increases to the suppression voltage of the follow current unit, the follow current unit automatically conducts follow current, so that the current of the main loop is ensured not to be interrupted; when the discharging is finished, the single battery is in a high-impedance state and can not pass current, and at the moment, the current of the main loop automatically flows to the follow current unit, so that the current of the main loop is ensured not to be interrupted.
Based on the content of the foregoing embodiment, in this embodiment, the method further includes: a control circuit; one end of the control circuit is connected with the N battery units, the other end of the control circuit is connected with the rectification inverter power supply, and the control circuit is used for detecting state parameters of the battery units, controlling the exit and the input of the battery units and adjusting the rectification inverter power supply.
In this embodiment, it should be noted that the battery series charging and discharging circuit provided by the embodiment of the present invention further includes a control circuit. The control circuit detects the state parameters of the battery unit on one hand and controls the exit or the input of the battery unit on the other hand, and regulates the rectification inverter power supply. Specifically, the control circuit can detect state parameters such as voltage at two ends of the N single batteries, battery temperature and the like, control the N single-pole double-throw relays, and adjust the rectification inverter power supply according to voltage and current requirements of battery charging and discharging. The control circuit judges the working state of the battery and obtains the performance parameters of the battery by acquiring the state parameters of the voltage at two ends of the single battery, the temperature of the battery, the charging and discharging current, the time, the current of the follow current unit and the like in real time, and controls the normally closed end and the normally open end of the single-pole double-throw relay to be switched according to the working state of the battery, thereby controlling the quitting and the putting-in of the battery unit.
In this embodiment, it should be noted that one end of the control circuit is connected to the N battery units, and the control circuit is configured to acquire working parameters of corresponding single batteries in the N battery units; the control circuit is used for controlling the working state of the corresponding single-pole double-throw relay in the N battery units according to the working parameters of the corresponding single battery in the N battery units so as to control the quitting and the putting of the N battery units. The other end of the control circuit is connected with the rectification inverter power supply, and the control circuit is further used for adjusting the working mode of the rectification inverter power supply according to the working parameters of the corresponding single batteries in the N battery units.
Based on the content of the foregoing embodiment, in this embodiment, the control circuit is configured to acquire the operating parameters of the corresponding single battery in the N battery units.
In this embodiment, the control circuit may detect state parameters such as voltages at two ends of the N single batteries and battery temperatures, control the N single-pole double-throw relays, and adjust the rectification inverter according to voltage and current requirements of battery charging and discharging. The control circuit judges the working state of the battery by acquiring state parameters such as voltage at two ends of the single battery, battery temperature and the like in real time, and controls the normally closed and normally open ends of the single-pole double-throw relay to be switched according to the working state of the battery, so that the exit and the input of the battery unit are controlled.
Based on the content of the foregoing embodiment, in this embodiment, the operating parameters of the single battery include: one or more of a charging voltage, a charging current, a discharging voltage, a discharging current, a battery temperature, a charging period, a discharging period, and a current of the freewheel unit.
In this embodiment, it should be noted that the operating parameters of the corresponding single battery in the battery unit collected by the control circuit may include one or more of a charging voltage, a charging current, a discharging voltage, a discharging current, a battery temperature, a charging duration, a discharging duration, and a current of the freewheel unit, and is not limited specifically here.
Based on the same utility model discloses think, the utility model discloses still another embodiment provides a battery series connection charge-discharge control method based on battery series connection charge-discharge circuit, like fig. 8, the utility model relates to a flow chart of a battery series connection charge-discharge control method based on battery series connection charge-discharge circuit that an embodiment provided is shown, the method specifically includes:
step 801: when the fact that the single batteries in any battery unit are charged is detected, if the single batteries are determined to have the voltage protection function, the voltage of the two ends of each single battery is increased due to the fact that the single batteries are in a high-impedance state, and when the voltage is increased to the restraining voltage of the follow current unit, the follow current unit automatically conducts follow current, and the current of a main loop is guaranteed not to be interrupted; if the single battery does not have the voltage protection function, when the control circuit detects that the voltages at the two ends of the single battery are higher than the set highest charging voltage, the control circuit controls the corresponding single-pole double-throw relay to switch, the normally closed end is disconnected and exits the single battery, and the main loop continues current through the current follow unit;
in this step, it should be noted that, as shown in fig. 2, when the single battery is charged, if the single battery has a voltage protection function, the single battery is in a high impedance state. At the moment, the voltage of the two ends of the single battery is increased, and when the voltage is increased to the restraining voltage of the follow current unit, the follow current unit automatically conducts follow current, so that the current of the main loop is ensured not to be interrupted. If the single battery has no voltage protection function, when the control circuit detects that the voltages at the two ends of the single battery are higher than the set highest charging voltage, the control circuit controls the corresponding single-pole double-throw relay to switch, the normally closed end is disconnected and exits the single battery, and the main loop continues current through the follow current unit. The current direction in the figure is from top to bottom.
Step 802: when the single batteries in any battery unit are detected to be charged, no matter whether the single batteries have the voltage protection function or not, when the control circuit detects that the voltages of the two ends of the single batteries are higher than the set highest charging voltage, the control circuit controls the corresponding single-pole double-throw relay to switch, the normally closed end is disconnected and exits the single batteries, the normally open end closes the bypass short-circuit follow current unit, the main loop current is switched to the closed normally open end, and the circuit loss is reduced to the lowest;
in this step, as shown in fig. 3, when the battery is charged, no matter whether the single battery has a voltage protection function, when the control circuit detects that the voltages at the two ends of the single battery are higher than the set highest charging voltage, the control circuit controls the corresponding single-pole double-throw relay to switch, the normally closed end is opened to exit the single battery, the normally open end closes the bypass short-circuit follow current unit, and the main circuit current is switched to the closed normally open end, so that the circuit loss is minimized. The current direction in the figure is from top to bottom.
Step 803: when the fact that the single batteries in any battery unit are discharged is detected, if the single batteries are determined to have the voltage protection function, the single batteries are in a high-impedance state and cannot pass current, and at the moment, the current of a main loop automatically flows to a follow current unit, so that the current of the main loop is ensured not to be interrupted; if the single battery does not have the voltage protection function, when the control circuit detects that the voltage at the two ends of the single battery is lower than the set lowest discharge voltage, the control circuit controls the corresponding single-pole double-throw relay to switch, the normally closed end is disconnected and exits the single battery, and the main loop continues current through the follow current unit;
in this step, it should be noted that as shown in fig. 2, when the single battery finishes discharging, if the single battery has a voltage protection function, the single battery is in a high impedance state and cannot pass current, at this time, the main loop current automatically flows to the follow current unit, so that the main loop current is ensured not to be interrupted. If the single battery has no voltage protection function, when the control circuit detects that the voltage of the two ends of the single battery is lower than the set lowest discharge voltage, the control circuit controls the corresponding single-pole double-throw relay to switch, the normally closed end is disconnected and exits the single battery, and the main loop continues current through the follow current unit. The current direction in the figure is from bottom to top.
Step 804: when the single batteries in any battery unit are detected to be discharged, no matter whether the single batteries have the voltage protection function or not, when the control circuit detects that the voltage of the two ends of the single batteries is lower than the set lowest discharge voltage, the control circuit controls the corresponding single-pole double-throw relay to switch, the normally closed end is disconnected and exits the single batteries, the normally open end closes the bypass short-circuit follow current unit, the main loop current is switched to the closed normally open end, and the circuit loss is reduced to the lowest.
In this step, as shown in fig. 3, when the battery is discharged, no matter whether the single battery has a voltage protection function, when the control circuit detects that the voltage across the single battery is lower than the set minimum discharge voltage, the control circuit controls the corresponding single-pole double-throw relay to switch, the normally closed end is opened to exit the single battery, the normally open end closes the bypass short-circuit freewheeling unit, and the main loop current is switched to the closed normally open end, so that the circuit loss is minimized. The current direction in the figure is from bottom to top.
According to the above technical scheme, the embodiment of the utility model provides a pair of charge-discharge control method based on battery series connection charging-discharging circuit, including rectification invertion power supply and two at least battery units, and every battery unit includes battery cell, single-pole double-throw relay and afterflow unit, and the normally closed end of single-pole double-throw relay links to each other with battery cell's positive pole, and the normally open end links to each other with battery cell's negative pole to with the parallelly connected bypass of afterflow unit in the common terminal and the normally open end of single-pole double-throw relay. The common end of the single-pole double-throw relay in each battery unit is connected with the negative electrode of the single battery in the previous battery unit, the negative electrode of the single battery in each battery unit is connected with the common end of the single-pole double-throw relay in the next battery unit, and the N battery units are sequentially connected in series and connected with the rectification inverter power supply to form a series charging and discharging circuit. When the battery is charged and discharged, the single battery is connected with the rectification inverter power supply after being connected in series through the normally closed end of the single-pole double-throw relay, and the bypass of the follow current unit cannot influence the charging and discharging main loop because the suppression voltage of the follow current unit is higher than the charging and discharging voltage of the single battery. When the battery finishes charging and discharging and needs to be withdrawn, in the transient process that the single battery withdraws from the main loop to the normally open end of the single-pole double-throw relay and the current passes through the main loop, the current of the main loop flows through the follow current unit, and the follow current unit plays a role in follow current, so that the current of the main loop is not interrupted. In addition, when the normally open end of the single-pole double-throw relay is closed, the bypass short circuit effect is achieved on the follow current unit, so that the conduction time of the follow current unit is shortened, the loss is reduced, and the hardware requirement on a follow current unit device is lowered. Therefore, the embodiment of the utility model provides a low-loss circuit for battery series connection charge-discharge for the normal charge-discharge work that withdraws from or drops into and do not influence other batteries of battery among the charge-discharge process has been realized to the multi-cell series connection charge, discharges, and easy operation prevents the maloperation, has solved the complicated, easy maloperation of control, the big scheduling problem of loss that present battery series connection charge-discharge circuit exists.
Based on the content of the foregoing embodiment, in this embodiment, the method further includes:
the control circuit is used for controlling the rectification inverter power supply to work in a rectification mode when the battery is charged;
the control circuit is used for controlling the rectification inverter power supply to work in an inverter mode when the battery discharges, and energy feedback is achieved.
In this embodiment, it should be noted that the control circuit is configured to control the rectification inverter to operate in a rectification mode when the battery is charged, where the power supply is an ac input power supply and a dc output power supply, and has a constant-voltage and constant-current regulation mode; the control circuit is used for controlling the rectification inverter power supply to work in an inverter mode when the battery discharges, and energy feedback is achieved.
Based on the content of the foregoing embodiment, in this embodiment, the method further includes:
when the discharging does not need current feedback, a preset discharging consumption mode is adopted to consume the discharging energy.
In this embodiment, it should be noted that when the discharge does not require current feedback, resistance heating or other methods may be used to consume the energy of the discharge.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (10)
1. A battery series charging and discharging circuit, comprising: the system comprises a rectification inverter power supply and N battery units, wherein N is more than or equal to 2;
each battery unit comprises a single battery, a single-pole double-throw relay and a follow current unit; the normally closed end of the single-pole double-throw relay is connected with the anode of the single battery, and the normally open end of the single-pole double-throw relay is connected with the cathode of the single battery; the follow current unit is connected with a bypass in parallel at the common end and the normally open end of the single-pole double-throw relay; the suppression voltage of the follow current unit is higher than the highest charge-discharge voltage of the single battery, and the follow current unit is in a reverse blocking state when the single battery is charged and discharged;
the public end of the single-pole double-throw relay in each battery unit is connected with the negative electrode of the single battery in the previous battery unit, the negative electrode of the single battery in each battery unit is connected with the public end of the single-pole double-throw relay in the next battery unit, and the N battery units are sequentially connected in series and connected with the rectification inverter power supply to form a series charging and discharging circuit.
2. The battery series charging and discharging circuit of claim 1, wherein the freewheeling unit is a Transient Voltage Suppressor (TVS) transistor.
3. The battery series charging and discharging circuit according to claim 1, wherein the free-wheeling unit is a circuit having TVS transistor characteristics formed by a combination of diodes.
4. The battery series charging and discharging circuit according to claim 1, wherein the single-pole double-throw relay is replaced by a single-pole double-throw switch; or, the single-pole double-throw relay is replaced by two single-pole switches; or the single-pole double-throw relay is replaced by two single-pole relays.
5. The battery series charging and discharging circuit of claim 1, wherein the single battery is a single battery or a single battery pack.
6. The battery series charging and discharging circuit according to claim 1, wherein the single battery is a single battery with or without a voltage protection function.
7. The battery series charging and discharging circuit according to claim 1, further comprising: a control circuit; one end of the control circuit is connected with the N battery units, the other end of the control circuit is connected with the rectification inverter power supply, and the control circuit is used for detecting state parameters of the battery units, controlling the exit and the input of the battery units and adjusting the rectification inverter power supply.
8. The battery series charging and discharging circuit of claim 7, wherein the control circuit is configured to collect operating parameters of corresponding cells in the N battery cells.
9. The battery series charging and discharging circuit of claim 8, wherein the operating parameters of the single battery comprise: one or more of a charging voltage, a charging current, a discharging voltage, a discharging current, a battery temperature, a charging period, a discharging period, and a current of the freewheel unit.
10. The battery series charging and discharging circuit as claimed in claim 1, wherein the operation mode of the rectification inverter power supply comprises a rectification mode and an inversion mode.
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| CN202023317938.6U CN213906363U (en) | 2020-12-31 | 2020-12-31 | Battery series connection charging and discharging circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113872281A (en) * | 2021-09-24 | 2021-12-31 | 广东邦普循环科技有限公司 | Battery management system |
| CN116559545A (en) * | 2023-07-10 | 2023-08-08 | 宏晶微电子科技股份有限公司 | Capacitor frequency conversion circuit and integrated circuit chip |
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2020
- 2020-12-31 CN CN202023317938.6U patent/CN213906363U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113872281A (en) * | 2021-09-24 | 2021-12-31 | 广东邦普循环科技有限公司 | Battery management system |
| CN116559545A (en) * | 2023-07-10 | 2023-08-08 | 宏晶微电子科技股份有限公司 | Capacitor frequency conversion circuit and integrated circuit chip |
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