CN114336841A - Battery inter-cluster current sharing control circuit, system and method - Google Patents
Battery inter-cluster current sharing control circuit, system and method Download PDFInfo
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Abstract
The invention discloses a battery inter-cluster current-sharing control circuit, a system and a method, wherein the battery inter-cluster current-sharing control circuit comprises: the device comprises a control unit, a driving unit, a detection unit and a switch circuit; the detection unit is used for collecting a current signal output by the target battery cluster and sending the current signal to the control unit; the control unit is used for sending the current signal to an upper computer, receiving a feedback signal sent by the upper computer and sending the feedback signal to the driving unit; the driving unit is used for generating a control signal based on the feedback signal and sending the control signal to the switch circuit, and the switch circuit is driven to be closed or opened so as to control the target battery cluster to drive to discharge or stop discharging. According to the invention, the problem that the charging and discharging currents of each battery cluster are inconsistent when a plurality of battery clusters are connected in parallel in the charging and discharging processes of the energy storage system is solved through the current sharing control circuit among the battery clusters, and the safe and stable operation of the energy storage system equipment is improved.
Description
Technical Field
The invention relates to the technical field of energy storage battery packs, in particular to a current sharing control circuit, a current sharing control system and a current sharing control method among battery clusters.
Background
With the large-scale application of new energy power generation resources, the volatility and unpredictability of wind power resources are gradually remarkable, and energy storage becomes a key technology for solving new energy power generation. In the field of battery energy storage, electrochemical cells, represented by lithium ion batteries, are the subject of large-scale application. With the rapid development of the new energy automobile market, the lithium ion battery becomes a more mainstream energy storage battery.
A plurality of single batteries are connected in parallel and in series to form a battery pack, and a battery cluster is formed by connecting different numbers of battery packs in series or in parallel. In the process of charging and discharging the energy storage system, the charging and discharging currents among the battery clusters are inconsistent. The life span of the battery pack is shortened and system performance is degraded.
Disclosure of Invention
The invention provides a circuit, a system and a method for controlling current sharing among battery clusters, aiming at overcoming the defect that the performance of a system is reduced due to inconsistent charging and discharging currents among the battery clusters when an energy storage system discharges in the prior art.
The invention solves the technical problems through the following technical scheme:
in a first aspect, the present invention provides a battery inter-cluster current sharing control circuit, where the battery inter-cluster current sharing control circuit includes: the device comprises a control unit, a driving unit, a detection unit and a switch circuit;
one end of the control unit is electrically connected with one end of the driving unit, the other end of the control unit is electrically connected with the detection unit, the other end of the driving unit is electrically connected with the switch circuit, one end of the switch circuit is electrically connected with the positive electrode of the direct current bus, the other end of the switch circuit is electrically connected with the positive electrode of the target battery cluster, the negative electrode of the target battery cluster is electrically connected with one end of the detection unit, and the other end of the detection unit is electrically connected with the negative electrode of the direct current bus;
the detection unit is used for collecting a current signal output by the target battery cluster and sending the current signal to the control unit;
the control unit is used for receiving a feedback signal sent by the upper computer and sending the feedback signal to the driving unit after sending the current signal to the upper computer;
the driving unit is used for generating a control signal based on the feedback signal and sending the control signal to the switch circuit to drive the switch circuit to be switched on or switched off so as to control the target battery cluster to drive discharge or stop discharge.
Preferably, the switching circuit includes N groups of equalizing branches, each group of equalizing branches includes a first MOS transistor, a first diode, a second MOS transistor, and a second diode;
the grid electrode of the first MOS tube is electrically connected with the first output end of the driving unit, and the grid electrode of the second MOS tube is electrically connected with the second output end of the driving unit; the source electrode of the first MOS tube is electrically connected with the source electrode of the second MOS tube;
the cathode of the first diode is electrically connected with the drain electrode of the first MOS tube, and the anode of the first diode is electrically connected with the source electrode of the first MOS tube;
the cathode of the second diode is electrically connected with the drain electrode of the second MOS tube, and the cathode of the second diode is electrically connected with the source electrode of the second MOS tube.
Preferably, the driving unit is further configured to generate a high level signal based on the feedback signal and send the high level signal to the switching circuit;
and the switching circuit is used for conducting after detecting the high level signal and controlling the target battery cluster to drive and discharge.
Preferably, the driving unit is further configured to generate a low level signal based on the feedback signal and send the low level signal to the switching circuit;
and the switching circuit is used for switching off after detecting the low level signal and controlling the target battery cluster to stop discharging.
Preferably, the driving unit includes a gate driver, the control unit includes an MCU, the detection unit includes a hall current detector, and the first MOS transistor and the second MOS transistor are NMOS transistors of the same type.
In a second aspect, the present invention further provides a battery inter-cluster current sharing control system, where the battery inter-cluster current sharing control system includes at least one battery inter-cluster current sharing control circuit described in the first aspect, at least one battery cluster, and an upper computer;
each battery inter-cluster current-sharing control circuit is electrically connected with each battery cluster in a one-to-one correspondence manner, and is in communication connection with the upper computer;
the upper computer is used for comparing current signals of the corresponding battery clusters acquired by all the inter-battery-cluster current-sharing control circuits, and controlling the on/off of a switch circuit in the inter-battery-cluster current-sharing control circuits according to a current comparison result.
In a third aspect, the present invention further provides a method for inter-battery-cluster current sharing control, where the method is implemented by using the inter-battery-cluster current sharing control circuit in the first aspect, and the method for inter-battery-cluster current sharing control includes:
the upper computer receives the current value corresponding to each battery cluster in real time and compares all the current values;
and controlling the on-off of a switch circuit in the current-sharing control circuit among the battery clusters according to the current comparison result.
Preferably, the step of controlling the opening or closing of the switch circuit in the current sharing control circuit between the battery clusters according to the current comparison result includes:
judging whether the current is not uniform according to the current comparison result;
if so, sending a first control instruction to a control unit of the inter-battery-cluster current-sharing control circuit corresponding to the minimum value of all the current values so as to control the corresponding battery cluster to stop discharging.
Preferably, the step of controlling the opening or closing of the switch circuit in the current sharing control circuit between the battery clusters according to the current comparison result further includes:
and after the preset time, sending a second control instruction to a control unit of the inter-battery-cluster current-sharing control circuit corresponding to the minimum value of all the current values so as to control the corresponding battery cluster to re-drive and discharge.
Preferably, the step of controlling the opening and closing of the switch circuit in the current sharing control circuit between the battery clusters according to the current comparison result includes:
judging whether the current is not uniform according to the current comparison result;
if not, sending a third control instruction to the control units of the current-sharing control circuits among all the battery clusters so as to control all the battery clusters to continue to drive and discharge.
The positive progress effects of the invention are as follows: the current-sharing control circuit, the current-sharing control system and the current-sharing control method among the battery clusters are characterized in that a detection unit is used for detecting a current signal output by a target battery cluster in real time and sending the current signal to an upper computer through a control unit, and a driving unit receives a feedback signal which is fed back to the control unit by the upper computer and aims at the current signal, generates a control signal and controls the on-off or on-off of a switching circuit, so that the driving discharge or the stopping of the discharge of the target battery cluster is controlled. According to the invention, the problem that the charging and discharging currents of each battery cluster are inconsistent when a plurality of battery clusters are connected in parallel in the charging and discharging processes of the energy storage system is solved through the current sharing control circuit among the battery clusters, and the safe and stable operation of the energy storage system equipment is improved.
Drawings
Fig. 1 is a schematic diagram of an operating principle of a current sharing control circuit between battery clusters in embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of a target battery cluster of the inter-battery-cluster current sharing control circuit in embodiment 1 of the present invention.
Fig. 3 is a first structural schematic diagram of a switch circuit of a current sharing control circuit between battery clusters in embodiment 1 of the present invention.
Fig. 4 is a second structural diagram of a switch circuit of the current sharing control circuit between battery clusters according to embodiment 1 of the present invention.
Fig. 5 is a schematic structural diagram of a current sharing control system between battery clusters according to embodiment 2 of the present invention.
Fig. 6 is a flowchart of a method for controlling current sharing among battery clusters according to embodiment 3 of the present invention.
Fig. 7 is a flowchart of step S2 of the method for controlling current sharing among battery clusters according to embodiment 3 of the present invention.
Fig. 8 is a schematic view of a first current flow direction of a current sharing control method between battery clusters according to embodiment 3 of the present invention.
Fig. 9 is a schematic diagram illustrating a second current flow direction of the method for current sharing control between battery clusters according to embodiment 3 of the present invention.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1
Referring to fig. 1, the present embodiment provides a battery inter-cluster current sharing control circuit, which includes: a control unit 110, a driving unit 120, a detection unit 130, and a switching circuit 140.
One end of the control unit 110 is electrically connected to one end of the driving unit 120, the other end of the control unit 110 is electrically connected to the detection unit 130, the other end of the driving unit 120 is electrically connected to the switching circuit 140, one end of the switching circuit 140 is electrically connected to the positive electrode of the dc bus, the other end of the switching circuit 140 is electrically connected to the positive electrode of the target battery cluster, the negative electrode of the target battery cluster is electrically connected to one end of the detection unit 130, and the other end of the detection unit 130 is electrically connected to the negative electrode of the dc bus.
The detection unit 130 is configured to collect a current signal output by the target battery cluster, and send the current signal to the control unit 110.
The control unit 110 is configured to send the current signal to the upper computer, receive a feedback signal sent by the upper computer, and send the feedback signal to the driving unit 120.
The driving unit 120 is configured to generate a control signal based on the feedback signal and send the control signal to the switching circuit 140, and drive the switching circuit 140 to be turned on or turned off to control the target battery cluster to drive discharge or stop discharge.
In specific implementation, the current-sharing control circuit between the battery clusters is applied to a charging and discharging scene of a target battery cluster (lithium battery cluster), as shown in fig. 2, as can be seen from a schematic structural diagram of the lithium battery cluster, the lithium battery cluster is formed by connecting a plurality of single lithium batteries in parallel and then in series, and when energy storage needs to meet high-power output, the plurality of battery clusters generally need to be connected in parallel. In this embodiment, the positive electrode of the target battery cluster composed of a plurality of lithium batteries is electrically connected to one end of the switch circuit 140, and the negative electrode of the target battery cluster is electrically connected to the detection unit 130.
The detection unit 130 collects current signals output by the connected target battery clusters in real time, and sends the current signals to an external upper computer through the control unit 110. And the upper computer compares the current signal with a preset current threshold value and judges whether the abnormal condition of non-uniform current among the battery clusters exists or not.
If an abnormal condition exists, the control unit 110 receives a first feedback signal sent by the upper computer, the driving unit 120 generates a first control signal according to the first feedback signal, and controls the switch circuit 140 to be switched off, so that a disconnection is formed between the target battery cluster and the switch circuit 140, and finally the target battery cluster stops discharging. After a preset time period (for example, 1ms or 2ms), the control unit 110 receives a second feedback signal sent by the upper computer, the driving unit 120 generates a second control signal according to the second feedback signal, and controls the switching circuit 140 to be closed again, so that the target battery cluster is discharged again.
If no abnormal condition exists, the control unit 110 receives a third feedback signal sent by the upper computer, the driving unit 120 generates a third control instruction according to the third feedback signal, and controls the switch circuit 140 to be continuously closed, so that the target battery cluster and the switch circuit 140 are continuously conducted, and finally the target battery cluster is continuously discharged.
As an alternative embodiment, the driving unit 120 is further configured to generate a low level signal based on the feedback signal and send the low level signal to the switching circuit 140. The switch circuit 140 is configured to turn off after detecting the low level signal, and control the target battery cluster to stop discharging.
The driving unit 120 is further configured to generate a high level signal based on the feedback signal and send the high level signal to the switching circuit 140. The switch circuit 140 is configured to be turned on after detecting the high level signal, and control the target battery cluster to drive discharging.
In a specific implementation, the driving unit 120 may output a low level signal according to a feedback signal sent by the upper computer, and control the switching circuit 140 to be turned off, so that the target battery cluster interrupts the discharging process. It can be understood that, by changing the specific circuit structure of the switch circuit 140, the driving unit 120 may also generate a high level signal according to the feedback signal, and control the switch circuit 140 to be turned off, so that the target battery cluster interrupts the discharging process. It should be emphasized that the present embodiment will be described by taking the case where the switch circuit 140 is turned on under a high level signal as an example.
Fig. 3 is a specific circuit diagram of an embodiment of the switching circuit 140, and the same components in the operation principle schematic diagram of the inter-battery-cluster current sharing control circuit shown in fig. 1 and the structural schematic diagram of the switching circuit 140 of the inter-battery-cluster current sharing control circuit shown in fig. 3 are denoted by the same reference numerals.
The switching circuit 140 includes N groups of equalizing branches, each group of equalizing branches includes a first MOS transistor 141, a first diode 142, a second MOS transistor 143, and a second diode 144.
The gate of the first MOS transistor 141 is electrically connected to the first output terminal of the driving unit 120, and the gate of the second MOS transistor 143 is electrically connected to the second output terminal of the driving unit 120; the source of the first MOS transistor 141 is electrically connected to the source of the second MOS transistor 143.
The cathode of the first diode 142 is electrically connected to the drain of the first MOS transistor 141, and the anode of the first diode 142 is electrically connected to the source of the first MOS transistor 141.
The cathode of the second diode 144 is electrically connected to the drain of the second MOS transistor 143, and the cathode of the second diode 144 is electrically connected to the source of the second MOS transistor 143.
In practical implementation, when the first output terminal and the second output terminal of the driving unit 120 simultaneously output low level signals, neither the first MOS transistor 141 nor the second MOS transistor 143 is turned on, and the first diode 142 and the second diode 144 do not flow current due to the unidirectional conduction characteristic, so the switching circuit 140 is in an off state, and the target battery cluster is controlled to stop discharging. When the first output terminal and the second output terminal of the driving unit 120 output high level signals simultaneously, the first MOS transistor 141 and the second MOS transistor 143 are both turned on, and the first diode 142 and the second diode 144 have current flowing due to the unidirectional conduction characteristic, so the switching circuit 140 is in a closed state, and controls the target battery cluster to restart discharging.
In the implementation process of the switch circuit 140, various changes may be made to the circuit diagram, and new devices, such as a resistor and a switch, may be added to the circuit diagram, and the connection manner of the switch circuit 140 is not particularly limited in the present invention.
As an alternative embodiment, referring to fig. 4, the driving unit 120 includes a gate driver, the control unit 110 includes an MCU, the detecting unit 130 includes a hall current detector, and the first MOS transistor 141 and the second MOS transistor 143 are NMOS transistors of the same type.
Specifically, when there are N target battery clusters, the switch circuit 140 in the first inter-battery-cluster current-sharing control circuit is electrically connected to the target battery cluster, and so on, the switch circuit 140 in the nth inter-battery-cluster current-sharing control circuit is electrically connected to the target battery cluster N. Each switching circuit 140 may include N equalization branches, a first equalization branch may include NMOS-11 and NMOS-21, a second equalization branch may include NMOS-12 and NMOS-22, and so on, and an nth equalization branch may include NMOS-1N and NMOS-2N.
In this embodiment, a current sharing control circuit between battery clusters is provided, in which a driving unit is used to receive a feedback signal for a current signal fed back to a control unit by an upper computer, and then a control signal is generated to control the on/off of a switch circuit, so as to control the driving discharge or the stopping of the discharge of a target battery cluster. The invention solves the problem that the charging and discharging currents of each battery cluster are inconsistent in the charging and discharging processes of the energy storage system, and improves the safe and stable operation of the energy storage system equipment.
Example 2
On the basis of embodiment 1, referring to fig. 5, this embodiment provides a battery inter-cluster current sharing control system, which includes at least one battery inter-cluster current sharing control circuit 100 in embodiment 1, at least one battery cluster 200, and an upper computer 300.
Each inter-battery-cluster current-sharing control circuit 100 is electrically connected with each battery cluster 200 in a one-to-one correspondence manner, and the inter-battery-cluster current-sharing control circuit 100 is in communication connection with the upper computer 300.
The upper computer 300 is used for comparing current signals of corresponding battery clusters acquired by all the inter-battery-cluster current sharing control circuits 100, and controlling the on/off of the switch circuit 140 in the inter-battery-cluster current sharing control circuit according to the current comparison result.
Specifically, when multiple battery clusters are connected in parallel, the current signal output by each battery cluster 200 is collected in real time, and the upper computer 300 compares all the current signals to determine whether there is an abnormality.
If the minimum current signal is smaller than the preset current threshold, the abnormal condition of current sharing among clusters exists. The current sharing control circuit 100 between the battery clusters is controlled to generate a first control signal according to a first feedback signal sent by the upper computer 300, and the switch circuit 140 is controlled to be switched off, so that an open circuit is formed between the battery clusters 200 and the switch circuit 140, and finally the battery cluster 200 corresponding to the minimum current signal stops discharging.
After a preset time period (for example, 1ms or 2ms), the inter-battery-cluster current-sharing control circuit 100 is controlled to generate a second control instruction according to a second feedback signal sent by the upper computer 300, and the switch circuit 140 is controlled to be closed again, so that the battery cluster 200 corresponding to the minimum current signal is discharged again finally.
If the minimum current signal is not less than the preset current threshold, the abnormal condition of non-current sharing among clusters does not exist. And controlling the current-sharing control circuit 100 between each battery cluster to generate a third control instruction according to a third feedback signal sent by the upper computer 300, and controlling the switch circuit 140 to be continuously closed, so that the battery clusters 200 and the switch circuit 140 are continuously conducted, and finally all the battery clusters 200 are continuously discharged.
In this embodiment, a current sharing control system between battery clusters is provided, and a current sharing control circuit between battery clusters receives a feedback signal sent by an upper computer and then generates a control signal to control the on/off of a switch circuit, so as to control the driving discharge or stop discharge of the battery clusters. The invention solves the problem that the charging and discharging currents of each battery cluster are inconsistent in the charging and discharging processes of the energy storage system, and improves the safe and stable operation of the energy storage system equipment.
Example 3
On the basis of embodiment 1, referring to fig. 6, this embodiment provides a method for controlling current sharing among battery clusters, which is implemented by applying the circuit for controlling current sharing among battery clusters of embodiment 1, and the method for controlling current sharing among battery clusters includes the following steps:
and S1, comparing all current values after the upper computer receives the current value corresponding to each battery cluster in real time.
And S2, controlling the opening or closing of the switch circuit in the current sharing control circuit among the battery clusters according to the current comparison result.
In step S1, when multiple battery clusters are connected in parallel, the upper computer collects the current signal output by each battery cluster in real time, and compares all the current signals to determine whether there is an abnormality.
In step S2, if there is an abnormality, a low-level signal may be input to the switch circuit in the inter-battery-cluster current sharing control circuit having an abnormal current signal, so that the switch circuit is turned off. If no abnormity exists, a high level signal can be input to a switch circuit in the current-sharing control circuit between each battery cluster, so that the switch circuit is continuously conducted, and each battery cluster is continuously discharged.
In one possible implementation, as shown in fig. 7, step S2 includes:
and S21, judging whether the current is unbalanced or not according to the current comparison result. If so, go to step S22, otherwise, go to step S24.
And S22, sending a first control instruction to a control unit of the battery inter-cluster current-sharing control circuit corresponding to the minimum value of all current values to control the corresponding battery cluster to stop discharging.
And S23, after the preset time, sending a second control instruction to the control unit of the current-sharing control circuit between the battery clusters corresponding to the minimum value in all the current values to control the corresponding battery clusters to re-drive and discharge.
And S24, sending a third control instruction to the control units of the current sharing control circuits among all the battery clusters to control all the battery clusters to continue to drive and discharge.
Specifically, in step S21, if the minimum current signal is smaller than the preset current threshold (e.g., each battery cluster output 100A under normal conditions, the preset current threshold is 90A), there is an abnormal condition of inter-cluster current non-uniformity. In step S22, the inter-battery-cluster current-sharing control circuit is controlled to generate a first control signal according to the first feedback signal sent by the upper computer, and the switch circuit is controlled to be turned off, so that an open circuit is formed between the battery cluster and the switch circuit, and finally the battery cluster corresponding to the minimum current signal stops discharging. For example, the minimum current signal corresponds to the second battery cluster, and after the second battery cluster is controlled to stop discharging, the current flows to other battery clusters during the discharging process as shown by the arrow in fig. 8, and the current flow to the dc bus is also shown by the arrow in fig. 8.
In step S23, after a preset time period (e.g., 1ms or 2ms), the inter-battery-cluster current-sharing control circuit is controlled to generate a second control instruction according to a second feedback signal sent by the upper computer, and the switching circuit is controlled to be closed again, so that the battery cluster corresponding to the minimum current signal is discharged again. For example, after the second battery cluster corresponding to the minimum current signal is recovered, the current flow of each battery cluster during the discharging process is shown by the arrow in fig. 9, and the current flow of the dc bus is also shown by the arrow in fig. 9.
In step S24, if the minimum current signal is not less than the preset current threshold, there is no abnormal situation of inter-cluster current sharing. And controlling the current-sharing control circuit between each battery cluster to generate a third control instruction according to a third feedback signal sent by the upper computer, and controlling the switch circuit to be continuously closed, so that the battery clusters are continuously conducted with the switch circuit, and finally all the battery clusters are continuously discharged.
It should be noted that steps S22 to S23 may be repeated until the current sharing control circuit between each battery cluster stably operates, so that the problem of inconsistent charging and discharging currents of each battery cluster may be alleviated to a certain extent, and the range of large-scale lithium battery energy storage requirements is expanded. The embodiment can also solve the problem of uneven current of each cluster in the charging stage of the battery cluster, and the specific implementation steps are similar to those in the discharging stage, so long as the current control directions corresponding to the charging stage and the discharging stage are opposite.
In one embodiment, under normal discharge conditions, each battery cluster outputs 100A, and the predetermined current threshold is 110A. If the maximum current signal is larger than the preset current threshold, the abnormal condition of current non-equalizing between clusters exists. And controlling the current-sharing control circuit between the battery clusters to generate a first control signal according to a first feedback signal sent by the upper computer, and controlling the switching circuit to be switched off, so that a circuit break is formed between the battery clusters and the switching circuit, and finally the battery cluster corresponding to the maximum current signal stops discharging.
In this embodiment, a current-sharing control method between battery clusters is provided, in which an upper computer receives a current value corresponding to each battery cluster in real time, compares all the current values, determines whether a current non-current-sharing condition occurs according to a current comparison result, and sends a plurality of different control instructions to a control unit of a current-sharing control circuit between battery clusters to control the corresponding battery cluster to stop discharging, redrive discharging, or continue to drive discharging. The invention solves the problem that when a plurality of battery clusters are connected in parallel in the charging and discharging processes of the energy storage system, the charging and discharging currents of the battery clusters are inconsistent, and improves the safe and stable operation of the energy storage system equipment.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (10)
1. The utility model provides a battery current-sharing control circuit between clusters which characterized in that, battery current-sharing control circuit includes: the device comprises a control unit, a driving unit, a detection unit and a switch circuit;
one end of the control unit is electrically connected with one end of the driving unit, the other end of the control unit is electrically connected with the detection unit, the other end of the driving unit is electrically connected with the switch circuit, one end of the switch circuit is electrically connected with the positive electrode of the direct current bus, the other end of the switch circuit is electrically connected with the positive electrode of the target battery cluster, the negative electrode of the target battery cluster is electrically connected with one end of the detection unit, and the other end of the detection unit is electrically connected with the negative electrode of the direct current bus;
the detection unit is used for collecting a current signal output by the target battery cluster and sending the current signal to the control unit;
the control unit is used for receiving a feedback signal sent by the upper computer and sending the feedback signal to the driving unit after sending the current signal to the upper computer;
the driving unit is used for generating a control signal based on the feedback signal and sending the control signal to the switch circuit to drive the switch circuit to be switched on or switched off so as to control the target battery cluster to drive discharge or stop discharge.
2. The inter-battery-cluster current-sharing control circuit of claim 1, wherein the switch circuit comprises N groups of equalizing branches, each group of equalizing branches comprising a first MOS transistor, a first diode, a second MOS transistor and a second diode;
the grid electrode of the first MOS tube is electrically connected with the first output end of the driving unit, and the grid electrode of the second MOS tube is electrically connected with the second output end of the driving unit; the source electrode of the first MOS tube is electrically connected with the source electrode of the second MOS tube;
the cathode of the first diode is electrically connected with the drain electrode of the first MOS tube, and the anode of the first diode is electrically connected with the source electrode of the first MOS tube;
the cathode of the second diode is electrically connected with the drain electrode of the second MOS tube, and the cathode of the second diode is electrically connected with the source electrode of the second MOS tube.
3. The inter-cluster current sharing control circuit of claim 2,
the driving unit is also used for generating a high-level signal based on the feedback signal and sending the high-level signal to the switching circuit;
and the switching circuit is used for conducting after detecting the high level signal and controlling the target battery cluster to drive and discharge.
4. The inter-cluster current sharing control circuit of claim 2,
the driving unit is also used for generating a low-level signal based on the feedback signal and sending the low-level signal to the switching circuit;
and the switching circuit is used for switching off after detecting the low level signal and controlling the target battery cluster to stop discharging.
5. The inter-cluster current sharing control circuit of claim 2, wherein the driving unit comprises a gate driver, the control unit comprises an MCU, the detecting unit comprises a hall current detector, and the first MOS transistor and the second MOS transistor are NMOS transistors of the same type.
6. An inter-battery-cluster current sharing control system, which is characterized by comprising at least one inter-battery-cluster current sharing control circuit as claimed in any one of claims 1 to 5, at least one battery cluster and an upper computer;
each battery inter-cluster current-sharing control circuit is electrically connected with each battery cluster in a one-to-one correspondence manner, and is in communication connection with the upper computer;
the upper computer is used for comparing current signals of the corresponding battery clusters acquired by all the inter-battery-cluster current-sharing control circuits, and controlling the on/off of a switch circuit in the inter-battery-cluster current-sharing control circuits according to a current comparison result.
7. A method for controlling current sharing among battery clusters is characterized in that the method for controlling current sharing among battery clusters is realized by adopting the circuit for controlling current sharing among battery clusters according to any one of claims 1 to 5, and the method for controlling current sharing among battery clusters comprises the following steps:
the upper computer receives the current value corresponding to each battery cluster in real time and compares all the current values;
and controlling the on-off of a switch circuit in the current-sharing control circuit among the battery clusters according to the current comparison result.
8. The method for controlling current sharing among battery clusters according to claim 7, wherein the step of controlling the opening or closing of the switch circuit in the battery cluster current sharing control circuit according to the current comparison result comprises:
judging whether the current is not uniform according to the current comparison result;
if so, sending a first control instruction to a control unit of the inter-battery-cluster current-sharing control circuit corresponding to the minimum value of all the current values so as to control the corresponding battery cluster to stop discharging.
9. The method for controlling current sharing among battery clusters according to claim 8, wherein the step of controlling the switch circuit in the battery cluster current sharing control circuit to be opened or closed according to the current comparison result further comprises:
and after the preset time, sending a second control instruction to a control unit of the inter-battery-cluster current-sharing control circuit corresponding to the minimum value of all the current values so as to control the corresponding battery cluster to re-drive and discharge.
10. The method for controlling current sharing among battery clusters according to claim 7, wherein the step of controlling the opening and closing of the switch circuit in the battery cluster current sharing control circuit according to the current comparison result comprises:
judging whether the current is not uniform according to the current comparison result;
if not, sending a third control instruction to the control units of the current-sharing control circuits among all the battery clusters so as to control all the battery clusters to continue to drive and discharge.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111628697.3A CN114336841A (en) | 2021-12-28 | 2021-12-28 | Battery inter-cluster current sharing control circuit, system and method |
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