CN214479779U - Power supply circuit - Google Patents

Power supply circuit Download PDF

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Publication number
CN214479779U
CN214479779U CN202120853623.9U CN202120853623U CN214479779U CN 214479779 U CN214479779 U CN 214479779U CN 202120853623 U CN202120853623 U CN 202120853623U CN 214479779 U CN214479779 U CN 214479779U
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battery
electrically connected
power supply
resistor
circuit
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王怀宇
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China Tower Co Ltd
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China Tower Co Ltd
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Abstract

The utility model provides a power supply circuit, power supply circuit includes: the battery pack comprises a plurality of battery components which are sequentially connected in series to form a battery anode and a battery cathode; the detection circuit is electrically connected with each battery component; the equalizing circuit is electrically connected with each battery component; the controller is electrically connected with the detection circuit and the equalization circuit; the controller determines the first N first battery assemblies with the voltages arranged from large to small according to the voltage of each battery assembly detected by the detection circuit, and controls the positive output end of each first battery assembly to be electrically connected with the positive electrode of the battery through the equalizing circuit, or controls the negative output end of each first battery assembly to be electrically connected with the negative electrode of the battery. The utility model provides an inside energy of group battery unbalance and influence the life's of group battery problem.

Description

Power supply circuit
Technical Field
The utility model relates to a group battery management technical field especially relates to a supply circuit.
Background
Most of the existing communication base station systems adopt lead-acid batteries as energy storage of a backup power supply. Lead acid batteries typically consist of a plurality of individual cells connected in series. In the process of charging and discharging the battery pack, each battery in the battery pack may have differences in brand, batch and capacity, so that the situations of overcharge, overdischarge, undercharge or undercharge of part of single batteries are easy to occur, and the service life and the utilization rate of the lead-acid battery pack are further influenced.
At present, when a lead-acid battery pack is charged and discharged, the battery pack is generally managed as a whole, so that the problem that the service life of the battery pack is affected due to the imbalance of energy in the battery pack is easy to occur.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a supply circuit to solve because the inside energy of group battery is unbalanced and influence the life problem of group battery.
The embodiment of the utility model provides a power supply circuit, include:
the battery pack comprises a plurality of battery components which are sequentially connected in series to form a battery anode and a battery cathode;
a detection circuit electrically connected to each of the battery packs;
the equalizing circuit is electrically connected with each battery assembly;
a controller electrically connected to the detection circuit and the equalization circuit;
wherein the controller determines the first N first battery components with voltages arranged from large to small according to the voltage of each battery component detected by the detection circuit, the positive output end of the first battery component is controlled to be electrically connected with the positive electrode of the battery through the equalizing circuit, or the negative output end of the first battery component is electrically connected with the battery negative electrode, and under the condition that the positive output end of the first target battery component in the N first battery components is the battery positive electrode, the controller controls the negative output end of the first target battery component to be electrically connected with the negative electrode of the battery through the balancing circuit, in the case where the negative output terminal of the second target battery assembly among the N first battery assemblies is the battery negative electrode, the controller controls the positive output end of the first target battery assembly to be electrically connected with the battery anode through the balancing circuit.
Optionally, the equalization circuit includes a plurality of equalization sub-circuits, and each equalization sub-circuit is electrically connected to each corresponding battery assembly.
Optionally, the balancing sub-circuit includes a capacitor, an inductor, a switching device, and a first diode, the capacitor is connected in parallel with the corresponding battery assembly, and the capacitor, the inductor, and the switching device are electrically connected to form a loop;
under the condition that the positive output end of the battery component is electrically connected with the positive electrode of the battery, the first end of the inductor is electrically connected with the positive electrode of the battery component, the second end of the inductor is connected with the anode of the first diode, and the cathode of the first diode is electrically connected with the positive electrode of the battery;
under the condition that the negative output end of the battery component is electrically connected with the negative electrode of the battery, the first end of the inductor is electrically connected with the negative electrode of the battery component, the second end of the inductor is connected with the cathode of the first diode, and the anode of the first diode is electrically connected with the negative electrode of the battery.
Optionally, the equalizing sub-circuit further includes a second diode, the second diode is connected in parallel with the switching device, and a conduction direction of the second diode is opposite to a conduction direction of the switching device.
Optionally, any one of the battery assemblies comprises one battery or a plurality of batteries connected in series.
Optionally, the detection circuit comprises:
the voltage detection circuit is electrically connected with the corresponding battery assembly and is used for detecting the voltage of the corresponding battery assembly; the voltage detection circuit is electrically connected with the controller and is used for transmitting an input signal of the voltage detection circuit to the controller;
the current detection circuit is electrically connected with the corresponding battery assembly and is used for detecting the current of the corresponding battery assembly; the current detection circuit is electrically connected with the controller and is used for transmitting an input signal of the current detection circuit to the controller.
Optionally, the voltage detection circuit includes a first amplifier, a second amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, and an eighth resistor;
the first amplifier comprises a first positive input end, a first negative input end, a first output end, a first positive power supply end and a first negative power supply end; the first positive input end is grounded through the fourth resistor; the first negative input end is electrically connected with the negative electrode of the battery assembly through the first resistor and the second resistor, and the common end of the first resistor and the second resistor is grounded through the third resistor; the first output end is connected with the first negative input end through the fifth resistor; the first positive power supply end is electrically connected with a first external power supply, and the first negative power supply end is grounded;
the second amplifier comprises a second positive input end, a second negative input end, a second output end, a second positive power supply end and a second negative power supply end; the second positive input end is grounded through the eighth resistor; the second negative input end is electrically connected with the first output end through the sixth resistor; the second output end is electrically connected with the second negative input end through the seventh resistor; the second positive power supply end is electrically connected with a second external power supply, and the second negative power supply end is grounded; the second output end is electrically connected with the controller.
Optionally, the current detection circuit comprises: the third amplifier comprises a third positive input end, a third negative input end, a third output end, a third positive power supply end and a third negative power supply end;
the ninth resistor is connected in series with the battery assembly; one end of the ninth resistor is electrically connected with the third positive input end, and the other end of the ninth resistor is electrically connected with the third negative input end; the third output end is electrically connected with the controller; the third positive power supply end is electrically connected with a third external power supply, and the third negative power supply end is grounded. Optionally, the switching device is a field effect MOS transistor.
The embodiment of the utility model provides an in the operation process of supply circuit, detection circuitry can be to each battery pack's voltage detects, the controller can be based on detection circuitry's testing result controls each respectively battery pack's positive output with the anodal connection condition of battery, or control battery pack's negative output with the connection condition of battery negative pole. Through the arrangement, the battery pack with higher voltage at any moment can bear more discharge capacity, so that energy balance among different battery packs is realized, the possibility of overuse of any battery pack is reduced, and the service life of the battery pack is prolonged.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and 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 inventive labor.
Fig. 1 is a schematic structural diagram of a power supply circuit provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a power supply circuit according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a power supply circuit according to an embodiment of the present invention in a case where the number of battery assemblies is 3;
fig. 4 is a schematic structural diagram of a voltage detection circuit according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a current detection circuit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by those of ordinary skill in the art to which the invention belongs. The use of "first," "second," and similar terms in the description herein do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.
As shown in fig. 1-5, an embodiment of the present invention provides a power supply circuit, including:
the battery pack comprises a plurality of battery components 11, wherein the battery components 11 are sequentially connected in series to form a battery anode 12 and a battery cathode 13;
the detection circuit 2 is electrically connected with each battery pack 11;
the equalizing circuit 3 is electrically connected with each battery assembly 11;
the controller 4 is electrically connected with the detection circuit 2 and the equalization circuit 3;
wherein, the controller 4 determines the first N first battery components with voltages arranged from large to small according to the voltage of each battery component 11 detected by the detection circuit 2, and the positive output end of the first battery component is controlled to be electrically connected with the battery anode 12 through the equalizing circuit 3, or the negative output end of the first battery assembly is electrically connected with the battery negative electrode 13, and in the case that the positive output end of the first target battery assembly of the N first battery assemblies is the battery positive electrode 12, the controller 4 controls the negative output end of the first target battery component to be electrically connected with the battery negative electrode 13 through the equalizing circuit 3, in the case where the negative output terminal of the second target battery assembly among the N first battery assemblies is the battery negative electrode 13, the controller 4 controls the positive output end of the first target battery assembly to be electrically connected with the battery positive electrode 12 through the equalization circuit 3.
The working principle of the power supply circuit provided by the embodiment of the application is as follows: the power supply circuit may be configured to supply power to an external load when the power supply circuit is electrically connected to the external load through the positive electrode and the negative electrode. When power is supplied to an external load, the external load and the plurality of battery packs 11 connected in series are communicated to form a loop. As the power supply circuit continues to discharge, the voltage of a plurality of the battery packs 11 decreases as the amount of discharge increases. Due to the different performances of the battery assemblies 11, the discharge amount of each battery assembly 11 may be different during the discharge process, and thus the voltage of each battery assembly 11 may be different. The voltage of each battery assembly 11 is detected by the detection circuit 2, and the first N first battery assemblies arranged from large to small are determined. And N is a positive integer, and the numerical value of N can be adjusted according to actual needs.
The operation of the power supply circuit will be described below by taking any one of the battery packs 11 as an example. In one case, when the battery assembly 11 is the first battery assembly, the controller 4 controls the positive output terminal of the battery assembly 11 to be electrically connected to the battery positive electrode 12 through the equalizing circuit 3. In this case, the first battery pack can supply current to the battery positive electrode 12 through the equalizing circuit 3 on the basis of the existing discharge circuit. At this time, it is considered that the discharge amount of the battery assembly 11 increases, and thus the voltage of the battery assembly 11 decreases rapidly. The detection circuit 2 monitors the voltage of each battery assembly 11 in real time, and determines the first N battery assemblies arranged from large to small in real time. After a certain period of discharge, the voltage of the battery assembly 11 decreases until the battery assembly 11 does not belong to the first battery assembly, and at this time, the controller 4 disconnects the electrical connection between the positive output terminal of the battery assembly 11 and the battery positive electrode 12 through the equalizing circuit 3. It should be understood that, in the case where the positive output terminal of the first target one of the battery packs 11 is the battery positive electrode 12, in order that the battery pack 11, the balancing circuit 3, and the external load may form a loop and be supplied with power from the battery pack 11 to the external load through the balancing circuit 3, the negative output terminal of the battery pack 11 should be electrically connected to the battery negative electrode 13.
In another case, when the battery assembly 11 is the first battery assembly, the controller 4 controls the negative output terminal of the battery assembly 11 to be electrically connected to the battery negative electrode 13 through the equalizing circuit 3. In this case, the battery assembly 11 can supply current to the battery cathode 13 through the balancing circuit 3 based on the existing discharge circuit. At this time, it is considered that the discharge amount of the battery assembly 11 increases, and thus the voltage of the battery assembly 11 decreases rapidly. The detection circuit 2 monitors the voltage of each battery assembly 11 in real time, and determines the first N battery assemblies arranged from large to small in real time. After a certain period of discharge, the voltage of the battery assembly 11 decreases until the battery assembly 11 does not belong to the first battery assembly, and at this time, the controller 4 disconnects the electrical connection between the negative output terminal of the battery assembly 11 and the battery negative electrode 13 through the equalizing circuit 3. It is to be understood that, in the case where the negative output terminal of the first target one of the battery modules 11 is the battery negative electrode 13, in order that the battery module 11, the balancing circuit 3, and an external load may form a loop and be supplied with power from the battery module 11 to the external load through the balancing circuit 3, the positive output terminal of the battery module 11 should be electrically connected to the battery positive electrode 12.
It should be understood that, in the case that the battery assembly 11 does not belong to the first target battery assembly and the second target battery assembly, the controller 4 may control the positive output terminal of the battery assembly 11 to be electrically connected to the battery positive electrode 12 through the equalizing circuit 3, and may control the negative output terminal of the battery assembly 11 to be electrically connected to the battery negative electrode 13 through the equalizing circuit 3.
It should be understood that the specific structure of the detection circuit 2 is not limited herein. The specific structure of the equalization circuit 3 is not limited herein. The plurality of battery components 11 are sequentially connected in series to form a battery anode 12 and a battery cathode 13, that is, any two adjacent battery components 11 are electrically connected in positive and negative poles, so that any adjacent battery components 11 are connected in series to form a whole, and the battery anode 12 and the battery cathode 13 are a plurality of whole anodes and cathodes formed after the battery components 11 are connected in series.
In this embodiment, in the operation process of the power supply circuit, the detection circuit 2 detects the voltage of each battery assembly 11, and the controller 4 controls the connection between the positive output terminal of each battery assembly 11 and the battery positive electrode 12 or controls the connection between the negative output terminal of the battery assembly 11 and the battery negative electrode 13 according to the detection result of the detection circuit 2. Through the arrangement, the battery pack 11 with higher voltage at any moment can bear more discharge capacity, so that energy balance among different battery packs 11 is realized, the possibility of overuse of any battery pack 11 is reduced, and the service life of the battery pack is prolonged.
Optionally, the equalizing circuit 3 includes a plurality of equalizing sub-circuits 31, and each equalizing sub-circuit 31 is electrically connected to each corresponding battery assembly 11.
It should be understood that the equalization circuit 3 includes a plurality of equalization sub-circuits 31, the controller 4 is connected to each of the plurality of equalization sub-circuits 31, and the controller 4 can control each of the plurality of equalization sub-circuits 31. The structure of the equalizing sub-circuit 31 is not limited herein, and the structure of the equalizing sub-circuits 31 may be different.
Optionally, as shown in fig. 2, the equalization sub-circuit 31 includes a capacitor, an inductor, a switching device and a first diode, the capacitor is connected in parallel with the corresponding battery assembly 11, and the capacitor, the inductor and the switching device are electrically connected to form a loop;
under the condition that the positive output end of the battery assembly 11 is electrically connected with the battery anode 12, the first end of the inductor is electrically connected with the anode of the battery assembly 11, the second end of the inductor is connected with the anode of the first diode, and the cathode of the first diode is electrically connected with the battery anode 12;
in the case where the negative output terminal of the battery assembly 11 is electrically connected to the battery negative electrode 13, the first terminal of the inductor is electrically connected to the negative electrode of the battery assembly 11, the second terminal of the inductor is connected to the cathode of the first diode, and the anode of the first diode is electrically connected to the battery negative electrode 13.
Fig. 2 and 3 show only the structures of the battery pack and the equalization circuit 3. Fig. 3 is a schematic diagram of a power supply circuit structure when the number of the battery assemblies is 3 and each of the battery assemblies includes one battery. The operation principle of the equalizing sub-circuit will be described below by taking fig. 3 as an example, and fig. 3 includes a first battery BT1, a second battery BT2, a third battery BT3, a first equalizing sub-circuit, a second equalizing sub-circuit and a third equalizing sub-circuit. The first equalizing sub-circuit comprises a first capacitor C1, a first inductor L1, a first switching device G1 and a diode D1, wherein the first capacitor C1 and the first battery BT1 are arranged in parallel. The second equalizing sub-circuit comprises a second capacitor C2, a second inductor L2, a second switching device G2 and a diode D2, wherein the second capacitor C2 and a second battery BT2 are arranged in parallel. The third equalizing sub-circuit comprises a third capacitor C3, a third inductor L3, a third switching device G3 and a diode D3, and the third capacitor C3 and the third battery BT3 are arranged in parallel. Wherein the diode D1, the diode D2 and the diode D3 are all the first diodes. For convenience of description, the principle of the corresponding components will be described below using letter reference numerals.
First, the operation principle of any of the equalization sub-circuits will be described by taking the first equalization sub-circuit as an example. During the discharging of the supply circuit, for the first equalization sub-circuit, the voltages of C1 and BT1 should be equal, since C1 and BT1 are connected in parallel. When the BT1 discharges, in order to maintain the voltages of C1 and BT1 equal, the higher real-time voltage of C1 and BT1 discharges, i.e., C1 and BT1 alternately supply power to external loads to maintain the voltages of C1 and BT1 equal. When G1 is in the on state, C1, L1 and G1 are communicated to form a loop, current flows through L1, and L1 stores energy. When G1 is turned off, the current in L1 cannot change abruptly according to the characteristics of the inductor, and L1 generates an induced electromotive force in order to suppress the change of the current. The working principle of the second equalization sub-circuit and the third equalization sub-circuit is the same as that of the first equalization sub-circuit, and is not described herein again.
In the discharging process of the power supply circuit, the detection circuit is used for detecting the voltage of each battery assembly and determining the first N first battery assemblies with the voltages arranged from large to small. The detection circuit detects the real-time voltage of the battery pack, and the voltage of the battery pack changes along with the discharging process, so that the first N first battery packs arranged from large to small at any time can be different. It should be understood that since the voltage is provided in parallel with the battery assembly, the voltage of the battery assembly may also be understood as the voltage of the capacitor.
For example, at any time, the voltages are arranged from large to small in the order of BT1, BT2, and BT3, and the N is 1, so BT1 is the first battery module. At this time, G1 is turned off, so that an induced electromotive force is generated on L1, and the direction of the induced electromotive force of L1 is opposite to the voltage direction of BT1, which corresponds to the reduction of the voltage of the D1 cathode. It will be appreciated that the anode of D1 is connected to the cell negative electrode 13, so that when G1 is in the on state, the anode voltage of D1 is always less than the cathode voltage of D1, so that D1 is always in the off state. The magnitude of the induced electromotive force of the L1 can be controlled by controlling the duty ratio of G1, and after the voltage is reduced, the voltage of the D1 cathode is less than that of the D1 anode, and then the D1 is turned on. At this time, C1 may deliver current to the battery negative electrode 13 through D1 and supply power to an external load. Therefore, C1 can be considered to be additionally powered, so that the voltage drop speed of BT1 is faster, until the voltage of BT1 is equal to or less than BT2 and BT3, at which time BT1 does not belong to the first battery pack, and G1 can be enabled again by the controller.
At another time, the voltages are BT3, BT2, and BT1 in descending order, and N is 2, when BT3 and BT2 are the first battery assembly. At this point, G2 and G3 are disconnected. For the second equalization sub-circuit, the induced electromotive force generated by L2 is in the same direction as the voltage of BT2, and therefore, the voltage of the D2 anode is increased. It will be appreciated that the cathode of D2 is connected to the cell positive electrode 12, so that when G2 is in the on state, the anode voltage of D2 is always less than the cathode voltage of D2, so that D2 is always in the off state. The magnitude of the induced electromotive force of the L2 can be controlled by controlling the duty ratio of G2, and after the voltage is boosted, the voltage of the anode of D2 is greater than that of the cathode of D2, so that D2 is turned on. At this time C2 may input current to the battery anode 12 through D2 and supply power to the external load. Similarly, for the third equalizing sub-circuit, the induced electromotive force generated by L3 is in the same direction as the voltage of BT3, which is equivalent to increasing the voltage of the D3 anode. It will be appreciated that the cathode of D3 is connected to the cell positive electrode 12, so that when G3 is in the on state, the anode voltage of D3 is always less than the cathode voltage of D3, so that D3 is always in the off state. The magnitude of the induced electromotive force of the L3 can be controlled by controlling the duty ratio of G3, and after the voltage is boosted, the voltage of the anode of D3 is greater than that of the cathode of D3, so that D3 is turned on. At this time C3 may input current to the battery anode 12 through D3 and supply power to the external load. Therefore, it can be considered that C2 and C3 are additionally powered, so that the voltage drop speed of BT2 and BT3 is fast, and when the voltage of BT2 drops to the point that BT2 does not belong to the first battery pack, G2 can be enabled to be in an on state again through the controller; when the voltage of BT3 drops to a point where BT3 does not belong to the first battery pack, G3 can be put back in the on state by the controller.
It should be understood that the above is only an example of the operation condition that may occur at any time when the power supply circuit discharges, in a specific implementation, the voltage magnitude of the battery assembly is changed in real time, and the value of N may also be adjusted according to a requirement, so that during the discharging process of the power supply circuit, the controller needs to adjust the on-off state of each of the switching devices in real time according to data of the detection circuit.
It should be understood that, for any one of the battery assemblies, the capacitor is arranged in parallel with the corresponding battery assembly, and when energy is stored in both the capacitor and the battery assembly, the capacitor can be regarded as a backup battery. When the corresponding battery assembly fails, the battery pack can still form a loop through the capacitor, so that the probability of the battery pack not working due to the failure of a single battery assembly is reduced, and the stability of the power supply circuit is improved. The size of the capacitor is not limited herein, and the capacitor can be selected according to actual requirements and the rated voltage of the battery assembly in parallel connection with the capacitor.
It should be understood that fig. 3 is merely illustrative of one of the circuit configurations. For BT1, the negative output of the battery assembly should be electrically connected to the battery negative electrode 13, since the positive output of BT1 is the battery positive electrode 12. With respect to BT2, since the positive output of BT2 is not the battery positive pole 12 and the negative output is not the battery negative pole 13, BT2 can be electrically connected to the battery positive pole 12 through the positive output or to the battery negative pole 13 through the negative output. For BT3, the positive output of the battery assembly should be electrically connected to the battery positive electrode 12, since the negative output of BT3 is the battery negative electrode 13. For the equalizing sub-circuit provided in this embodiment, the electrically connecting the positive output end of the battery assembly with the battery anode 12 means that the first end of the inductor is electrically connected with the positive electrode of the battery assembly, the second end of the inductor is connected with the anode of the first diode, and the cathode of the first diode is electrically connected with the battery anode 12. The electrical connection between the negative output end of the battery assembly and the battery negative electrode 13 means that the first end of the inductor is electrically connected to the negative electrode of the battery assembly, the second end of the inductor is connected to the cathode of the first diode, and the anode of the first diode is electrically connected to the battery negative electrode 13.
In the power supply circuit provided by this embodiment, the on/off condition of the switching device is controlled to control the conduction of the first diode, so that the battery assembly 11 with higher voltage bears more discharge capacity, thereby realizing energy balance among different battery assemblies 11 and reducing the possibility of over-discharge or under-discharge of the battery assemblies 11.
Optionally, in some embodiments, the equalizing sub-circuit 31 further includes a second diode, the second diode is connected in parallel with the switching device, and a conducting direction of the second diode is opposite to a conducting direction of the switching device.
It should be understood that the second diode is connected in parallel with the switching device and the on direction of the second diode is opposite to the on direction of the switching device, which means that the second diode is in an off state when a forward voltage is applied across the switching device; the second diode is in a conductive state when a reverse voltage is applied across the switching device.
With the equalizing sub-circuit 31 provided in the present embodiment, when the switching device is in the on state, the current flows through the loop of the capacitor, the inductor, and the switching device, and at this time, the second diode is in the off state because the voltage across the second diode is the reverse voltage. When the switching device is turned off, the induced electromotive force generated by the inductor is still a reverse voltage for the second diode in order to suppress a change in current, and thus the second diode is still in a conductive state. It can be seen that the second diode does not affect the operation of the switching device as a switch. When the two ends of the switching device are under the action of reverse voltage, the second diode is conducted under the action of forward voltage, so that current can flow through the second diode, the possibility of reverse breakdown of the switching device is reduced, and the switching device is protected to a certain extent.
In this embodiment, by the arrangement of the second diode, the possibility of reverse breakdown of the switching device can be reduced, and the switching device is protected to a certain extent, so that the reliability of the equalizing sub-circuit 31 is improved.
Optionally, any one of the battery modules 11 includes one battery or a plurality of batteries connected in series.
It should be understood that in the case where the battery assembly 11 includes a plurality of batteries connected in series, the plurality of batteries may be regarded as a whole. When the voltage and the current of the battery pack 11 are adjusted, the voltage and the current of the entire plurality of batteries connected in series are adjusted. Because the battery pack 11 comprises a plurality of batteries connected in series, and each battery pack 11 is correspondingly connected with the equalizing circuit 3, the number of the equalizing circuits 3 is reduced, namely the number of components is reduced, and the cost is reduced. In the case that the battery assembly 11 includes one battery, the equalizing circuit 3 adjusts the voltage and the current of one battery cell, so that the operation condition of each battery cell can be better controlled, and the service life of the power supply circuit is further prolonged.
It should be understood that different battery packs 11 may include different numbers of the batteries. For example, in one embodiment, the battery assembly 11 includes a first battery assembly including one of the batteries and the second battery assembly includes two of the batteries connected in series. Meanwhile, the series connection sequence of the first battery pack and the second battery pack is not limited herein.
In this embodiment, any one of the battery packs 11 includes one battery or a plurality of batteries connected in series. In actual use, the number of the batteries of the battery assembly 11 can be set according to actual requirements and actual conditions of the batteries, so that the flexibility of the power supply circuit is improved.
Optionally, the detection circuit 2 includes:
a voltage detection circuit electrically connected to the corresponding battery assembly 11, for detecting a voltage of the corresponding battery assembly 11; the voltage detection circuit is electrically connected with the controller 4 and is used for transmitting an input signal of the voltage detection circuit to the controller 4;
the current detection circuit is electrically connected with the corresponding battery assembly 11 and is used for detecting the current of the corresponding battery assembly 11; the current detection circuit is electrically connected with the controller 4 and is used for transmitting an input signal of the current detection circuit to the controller 4.
It should be understood that, any battery assembly 11 is provided with the corresponding voltage detection circuit, and the voltage detection circuit is electrically connected to the corresponding battery assembly 11, which can be understood as that an input end of the voltage detection circuit is connected to two ends of the battery assembly 11, so that the voltage detection circuit is connected in parallel with the corresponding battery assembly 11 to measure the voltage of the corresponding battery assembly 11. The voltage detection circuit is electrically connected with the controller 4, and it is understood that an output end of the voltage detection circuit is electrically connected with the controller 4 to transmit a detection result of the voltage detection circuit to the controller 4, so as to provide a data reference for a control strategy of the controller 4. The specific structure of the voltage detection circuit is not limited herein.
It should be understood that any one of the battery assemblies 11 is provided with the corresponding current detection circuit, and the current detection circuit is electrically connected to the corresponding battery assembly 11, which can be understood as that the current detection circuit is connected in series with the corresponding battery assembly 11 to detect the current of the corresponding battery assembly 11. The current detection circuit is electrically connected with the controller 4, and it is understood that an output end of the current detection circuit is electrically connected with the controller 4 to transmit a detection result of the current detection circuit to the controller 4, so as to provide a data reference for a control strategy of the controller 4. The specific structure of the current detection circuit is not limited herein.
It will be appreciated that in some embodiments the detection circuit 2 further comprises a temperature detection component. The specific structure of the temperature detection assembly is not limited herein. For example, in one embodiment, the temperature detection component is a temperature sensor, the temperature sensor may be of a type of DS18B20, the temperature sensor DS18B20 uses digital transmission, the temperature measurement range is-10 ℃ to 85 ℃, and the detection accuracy is 0.5 ℃.
In the present embodiment, the detection circuit 2 includes the voltage detection circuit and the current detection circuit to detect the voltage and the current of the battery assembly 11 in real time. Through the real-time detection of the voltage and the current of the battery pack 11, a data reference can be provided for the control strategy of the controller 4, so that the energy balance among different battery packs 11 can be better realized.
Optionally, in some embodiments, as shown in fig. 4, the voltage detection circuit includes a first amplifier, a second amplifier, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8;
the first amplifier comprises a first positive input end, a first negative input end, a first output end, a first positive power supply end and a first negative power supply end; the first positive input terminal is grounded through the fourth resistor R4; the first negative input end is electrically connected with the negative electrode of the battery assembly 11 through the first resistor R1 and the second resistor R2, and the common end of the first resistor R1 and the second resistor R2 is grounded through the third resistor R3; the first output end is connected with the first negative input end through the fifth resistor R5; the first positive power supply end is electrically connected with a first external power supply Vcc1, and the first negative power supply end is grounded;
the second amplifier comprises a second positive input end, a second negative input end, a second output end, a second positive power supply end and a second negative power supply end; the second positive input terminal is connected to ground through the eighth resistor R8; the second negative input end is electrically connected with the first output end through the sixth resistor R6; the second output end is electrically connected with the second negative input end through the seventh resistor R7; the second positive power supply end is electrically connected with a second external power supply Vcc2, and the second negative power supply end is grounded; the second output terminal is electrically connected to the controller 4.
The working principle of the voltage detection circuit provided by the embodiment is as follows: the voltage detection circuit amplifies the voltage of the battery pack 11 through a two-stage operational amplifier to obtain a detection result. Specifically, the second resistor R2, the fourth resistor R4, the fifth resistor R5 and the first amplifier form a first-stage amplifying circuit, and the negative electrode of the battery pack 11 is electrically connected with one end of the first resistor R1, which is far away from the second resistor R2. The negative electrode of the battery assembly 11 is grounded through the first resistor R1 and the third resistor R3 to form a loop, and the voltage of the battery assembly 11 is divided and then input to the first negative input end of the first amplifier through the second resistor R2. In a specific implementation, the value of the negative electrode voltage of the battery assembly 11 is usually large, and if the negative electrode voltage of the battery assembly 11 is directly amplified in two stages, the output voltage is too large. Therefore, in order to reduce the output voltage value on the one hand and to improve the detection accuracy on the other hand, the voltage of the negative electrode of the battery assembly 11 is generally divided by a resistor. By adjusting the values of the first resistor R1 and the third resistor R3, the divided voltage value can be in a reasonable order of magnitude. And amplifying the divided voltage through the first amplifier and outputting the amplified voltage through the first output end. The sixth resistor R6, the seventh resistor R7, the eighth resistor R8 and the second amplifier form a second-stage amplifying circuit, and the voltage of the first output terminal is used as the input voltage of the second-stage amplifying circuit, amplified by the second amplifier and then output to the controller 4 through the second output terminal.
It should be understood that the values of the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, and the eighth resistor R8 are not limited herein, and may be adjusted according to actual requirements, and according to principle analysis of the voltage detection circuit, the values of the first resistor R1 and the third resistor R3 affect the magnitude of the voltage value entering the first amplifier after voltage division, the values of the second resistor R2, the fourth resistor R4, and the fifth resistor R5 affect the amplification factor of the first amplifier, and the values of the sixth resistor R6, the seventh resistor R7, and the eighth resistor R8 affect the amplification factor of the second amplifier.
It should be understood that in particular implementations, to improve the accuracy of detection, a capacitor may be added to the voltage detection circuit for filtering. For example, in an embodiment, the voltage detection circuit further includes a first capacitor, and the second negative input terminal is grounded through the first capacitor. The first capacitor is used for filtering the current of the second negative input end. In another embodiment, the voltage detection circuit further includes a tenth resistor and a second capacitor, one end of the tenth resistor is electrically connected to the second output terminal, the other end of the tenth resistor is grounded through the second capacitor, and a common end of the tenth resistor and the second capacitor is electrically connected to the controller 4. And the tenth resistor and the second capacitor form a filter circuit for filtering the output voltage of the second output end.
It should be understood that, in particular implementation, in order to better judge the variation condition of the voltage, the first negative input terminal or the second negative input terminal of the voltage detection circuit may be electrically connected with a reference voltage source. For example, in an embodiment, the voltage detection circuit further includes a reference voltage source, and a common terminal of the sixth resistor R6 and the seventh resistor R7 is electrically connected to the reference voltage source. In this embodiment, the input current of the second negative input terminal is a linear superposition value of the voltage value provided by the reference voltage source and the voltage value of the first output terminal. Still further, in another embodiment, the voltage detection circuit further includes an eleventh resistor and a third capacitor, the reference voltage source is electrically connected to a common terminal of the sixth resistor and the seventh resistor through the eleventh resistor, and a common terminal of the sixth resistor and the seventh resistor is grounded through the third capacitor. And the eleventh resistor and the third capacitor form a filter circuit for filtering the input voltage of the reference voltage source.
It should be understood that the structure of the voltage detection circuit is not limited herein. The voltage detection circuit can adopt one-stage or multi-stage amplification circuit. And the amplification factor of the amplifying circuit can be adjusted according to actual requirements.
In this embodiment, by setting the voltage detection circuit, the detection efficiency and the detection accuracy of the voltage value of the battery assembly 11 can be improved, so that the energy balance among the battery assemblies 11 can be better realized.
Optionally, in some embodiments, as shown in fig. 5, the current detection circuit includes: a third amplifier and a ninth resistor R9, the third amplifier including a third positive input terminal, a third negative input terminal, a third output terminal, a third positive power terminal and a third negative power terminal;
the ninth resistor R9 is connected in series with the battery assembly 11, and one end of the ninth resistor R9 is electrically connected to the third positive input terminal, and the other end is electrically connected to the third negative input terminal; the third output end is electrically connected with the controller 4; the third positive power supply terminal is electrically connected to a third external power supply Vcc3, and the third negative power supply terminal is grounded.
It should be understood that the value of the ninth resistor R9 is not limited herein. In a specific implementation, the ninth resistor R9 is usually a precision resistor for higher accuracy of current detection.
It will be appreciated that in some embodiments the third amplifier is a MAX40056, wherein the MAX40056 is a bi-directional current amplifier with an input common mode analog rejection range of-0.1V to +65V, so that current can be detected both during charging and discharging of the power supply circuit. Of course, in other embodiments, the third amplifier may be an integrated operational amplifier of other types according to actual requirements.
The working principle of the current detection circuit provided by the embodiment is as follows: the current detection circuit needs to be connected in series with the corresponding battery assembly 11 to measure the current value of the corresponding battery assembly 11. In this embodiment, since the power supply circuit includes the balancing circuit 3, and the battery assembly 11 can be electrically connected to the battery anode 12 or the battery cathode 13 through the balancing circuit 3 under a specific condition, the balancing circuit 3 shunts the corresponding battery assembly 11. In a specific implementation, the current of the battery assembly 11 detected by the current detection circuit is the current of the battery assembly 11 shunted by the equalizing circuit 3. When a current flows through the ninth resistor, a voltage drop occurs across the ninth resistor R9, so that the current value can be converted into a voltage value by the ninth resistor R9. The voltage value can be amplified by the third amplifier and the detection data can be transmitted from the third output to the controller 4. Wherein the ninth resistor R9 is a precision resistor to realize accurate measurement of the current.
It should be understood that the structure of the current detection circuit is not limited herein. The current detection circuit can adopt one-stage or multi-stage amplification circuit. And the amplification factor of the amplifying circuit can be adjusted according to actual requirements. The amplifier can also select integrated operational amplifiers of other types according to actual requirements so as to realize corresponding amplification functions.
In this embodiment, by providing the current detection circuit, the detection efficiency and the detection accuracy of the current value of the battery assembly 11 can be improved, so that the energy balance among the battery assemblies 11 can be better realized.
Optionally, in some embodiments, the switching device is a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET). The field effect transistor may also be referred to as a MOS transistor.
It should be understood that the type of switching device is not limited thereto. For example, in one embodiment, the switching device is a turn-off thyristor (GTO). In another embodiment, the switching device is an Insulated Gate Bipolar Transistor (IGBT), and the specific switching device can be selected according to actual requirements.
The MOS tube has the advantages of low power consumption, stable performance, strong anti-interference capability, good thermal stability and the like, and the MOS tube is adopted in the embodiment, so that the power supply circuit provided by the embodiment has all the beneficial effects of the MOS tube.
When the power supply circuit is connected to an external circuit, the power supply circuit can be discharged to the external circuit as a power source, and can be charged to the power supply circuit from the external circuit as a load. The controller 3 can control the current and voltage of the battery assembly 11 through the equalization circuit 3. In order to better understand the working principle of the power supply circuit, a specific control method of the power supply circuit will be explained. The control method of the power supply circuit comprises the following steps:
acquiring a voltage value of each battery pack 11 of the power supply circuit;
determining the first N first battery assemblies with voltages arranged from large to small;
controlling the positive output end of the first battery component to be electrically connected with the battery anode 12 of the power supply circuit, or controlling the negative output end of the first battery component to be electrically connected with the battery cathode 13;
under the condition that the positive output end of a first target battery pack in the N first battery packs is the battery anode 12, the controller controls the negative output end of the first target battery pack to be electrically connected with the battery cathode 13 through the equalizing circuit, and under the condition that the negative output end of a second target battery pack in the N first battery packs is the battery cathode 13, the controller controls the positive output end of the first target battery pack to be electrically connected with the battery anode 12 through the equalizing circuit.
It should be understood that the method for obtaining the voltage value of each battery assembly 11 of the power supply circuit is not limited herein. In some embodiments, the voltage value of each battery assembly 11 may be acquired by a detection circuit of the power supply circuit.
It is to be understood that the value of N is not limited thereto. The value of N can be set and adjusted according to actual requirements. During the operation of the power supply circuit, the voltage value of each battery assembly 11 changes in real time, so the first N first battery assemblies, whose voltages are arranged from large to small, also change in real time.
And under the condition that the first battery assembly is the first target battery assembly, the controller needs to control the positive output end of the first battery assembly to be electrically connected with the battery anode 12 of the power supply circuit, and under the condition that the first battery assembly is the second target battery assembly, the controller needs to control the negative output end of the first battery assembly to be electrically connected with the battery cathode 13. For the other first battery assemblies, the controller may control the positive output terminal of the first battery assembly to be electrically connected to the battery positive electrode 12 of the power supply circuit, or may control the negative output terminal of the first battery assembly to be electrically connected to the battery negative electrode 13. Through the arrangement, the first battery pack discharges through an additional loop, namely the discharge amount of the battery pack 11 with high voltage is larger than that of the battery pack 11 with low voltage, so that energy balance among the battery packs 11 is realized.
Optionally, the obtaining the voltage value of each battery assembly 11 of the power supply circuit further includes:
determining the battery assembly 11 with the target parameter value larger or smaller than the target preset value as a second battery assembly;
adjusting the connection duration of a target output end and a target connection end according to the adjustment parameter value of the second battery pack so that the target parameter value of the second battery pack is equal to the target preset value;
wherein the target parameter value is one of a voltage value or a current value, and the adjustment parameter value is the other of a voltage value or a current value;
wherein the target output end is the positive output end of the second battery pack, and the target connection end is the battery positive electrode 12; or, the target output end is the negative output end of the second battery assembly, and the target connection end is the battery cathode 13.
It should be understood that the method for obtaining the voltage value of each battery assembly 11 of the power supply circuit is not limited herein. In some embodiments, the voltage value of each battery assembly 11 may be acquired by a detection circuit of the power supply circuit. The method for obtaining the current value of each battery assembly 11 of the power supply circuit is not limited herein. In some embodiments, the current value of each battery assembly 11 may be obtained by a detection circuit of the power supply circuit. In other embodiments, each battery assembly 11 is connected in series with a corresponding reference resistor, and the voltage value of the reference resistor is measured to calculate the current value of the battery assembly 11.
It will be appreciated that in one case, the target parameter value is a voltage value and the adjustment parameter value is a current value. And determining the battery assembly 11 with the voltage value larger or smaller than the target preset value as a second battery assembly, and correspondingly prolonging or shortening the connection time of the target output end and the target connection end according to the current value of the second battery assembly. In this case, the voltage of the battery assembly 11 can be controlled to be constant at the target preset value. In particular implementation, the constant voltage charging of the power supply circuit can be realized. In another case, the target parameter value is a current value and the adjustment parameter value is a voltage value. And determining the battery pack 11 with the current value larger or smaller than the target preset value as a second battery pack, and correspondingly prolonging or shortening the connection time of the target output end and the target connection end according to the voltage value of the second battery pack. In this case, the current of the battery assembly 11 can be controlled to be constant at the target preset value. In specific implementation, the method can be used for realizing the constant-current charging of the power supply circuit.
It should be understood that, in the case that the target parameter value is a voltage value, the target preset value corresponding to the voltage value is a first target preset value; and under the condition that the target parameter value is a current value, the target preset value corresponding to the current value is a second target preset value. The first target preset value and the second target preset value are different values.
The control method of the power supply circuit will be described below by taking fig. 3 as an example. The constant current charging and the constant voltage charging are generally realized by the control method provided by the present embodiment when the power supply circuit shown in fig. 3 is charged. According to the structure of the power supply circuit, the following relation can be obtained:
Figure BDA0003035695220000181
wherein, D isiThe duty cycle of the switching device, i.e. being in the on state during a pulse cycleThe proportion of time relative to total time; l is an inductance value; said IcIs the current value; t issFor the total time of one pulse cycle period of the switching device, VbIs the voltage value.
According to the above relationship, for any one of the second battery packs, when the current value of the second battery pack is a constant value, the voltage value of the second battery pack is inversely proportional to the duty ratio of the switching device, that is, in order to make the current value of the second battery pack constant to the target preset value, the duty ratio of the switching device needs to be correspondingly inversely proportional to the voltage value of the second battery pack. Under the condition that the voltage value of the second battery pack is a constant value, the current value of the second battery pack is in direct proportion to the duty ratio of the switching device, that is, in order to make the voltage value of the second battery pack constant to be the target preset value, the duty ratio of the switching device needs to be correspondingly adjusted in direct proportion according to the current value of the second battery pack. With the power supply circuit provided in fig. 3, when the switching device is in the off state, the target output terminal of the second battery pack is connected to the target connection terminal. The connection duration of the target output end and the target connection end of the second battery pack can be adjusted by adjusting the duty ratio of the switching device.
In particular implementations, the power supply circuit typically employs a segmented charging. When charging is started, firstly, determining the battery pack 11 with the current value larger or smaller than the second target preset value as a second battery pack; and adjusting the connection time of the target output end and the target connection end according to the voltage value of the second battery pack so that the current value of the second battery pack is constant to be the second target preset value. At this time, the battery assembly 11 may be considered to be in a constant current charging phase, and the voltage of the battery assembly 11 gradually rises. When the voltage of the battery assembly 11 rises to a constant voltage preset value, determining the battery assembly 11 with the voltage value greater than or less than the first target preset value as a second battery assembly; and adjusting the connection time of a target output end and a target connection end according to the current value of the second battery pack so as to enable the voltage value of the second battery pack to be constant to be the first target preset value. At this time, it can be considered that the battery assembly 11 is in a constant voltage charging phase, and the current of the battery assembly 11 is gradually reduced. It should be noted that, in the case where the power supply circuit is in the charging phase, the acquired voltage value is generally a charging voltage, i.e., a voltage applied across the battery assembly 11 by an external circuit. In some embodiments, a float phase is entered after the power supply circuit is full. Through the setting in the float charging stage can prevent that the battery from overcharging to do benefit to supply circuit's steady safe operation. In the floating charge stage, the floating charge voltage adopts a linear compensation scheme, and the relation is as follows:
Uf＝Vt-(T-Tb)*k
wherein, the UfFor float voltage, TbIs a standard temperature, said VtIs a standard temperature TbAnd the lower float charge voltage value, T is the instant temperature of battery charging, and k is a temperature compensation coefficient.
Furthermore, in order to better prevent the battery assembly 11 from being overcharged or undercharged, multi-stage charging may be adopted, that is, the charging process may be divided into a plurality of stages, and the battery assembly 11 with a target parameter value greater than or less than a target preset value is determined as a second battery assembly in any one of the stages; and adjusting the connection time of a target output end and a target connection end according to the adjustment parameter value of the second battery pack so as to enable the target parameter value of the second battery pack to be equal to the target preset value. According to different target parameter values, constant current charging or constant voltage charging can be achieved in different stages, and the target parameter values corresponding to different stages can be different.
It is understood that the voltage or current of the second battery pack may be made to be at a constant value by adjusting the connection time period of the target output terminal and the target connection terminal of the second battery pack. When the power supply circuit is charged, the constant-current charging or the constant-voltage charging of the battery assembly 11 can be realized by controlling the voltage or the current of the second battery assembly to be at a constant value, so that the possibility of over-charging or under-charging of the battery assembly 11 is reduced, and the energy of the battery pack is more balanced.
The above embodiments are only specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, and all should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (9)

1. A power supply circuit, comprising:
the battery pack comprises a plurality of battery components which are sequentially connected in series to form a battery anode and a battery cathode;
a detection circuit electrically connected to each of the battery packs;
the equalizing circuit is electrically connected with each battery assembly;
a controller electrically connected to the detection circuit and the equalization circuit;
wherein the controller determines the first N first battery components with voltages arranged from large to small according to the voltage of each battery component detected by the detection circuit, the positive output end of the first battery component is controlled to be electrically connected with the positive electrode of the battery through the equalizing circuit, or the negative output end of the first battery component is electrically connected with the battery negative electrode, and under the condition that the positive output end of the first target battery component in the N first battery components is the battery positive electrode, the controller controls the negative output end of the first target battery component to be electrically connected with the negative electrode of the battery through the balancing circuit, in the case where the negative output terminal of the second target battery assembly among the N first battery assemblies is the battery negative electrode, the controller controls the positive output end of the first target battery assembly to be electrically connected with the battery anode through the balancing circuit.
2. The power supply circuit of claim 1, wherein the equalization circuit comprises a plurality of equalization sub-circuits, each of the equalization sub-circuits being electrically connected to a corresponding one of the battery assemblies.
3. The power supply circuit according to claim 2, wherein the balancing sub-circuit comprises a capacitor, an inductor, a switching device and a first diode, the capacitor is connected in parallel with the corresponding battery assembly, and the capacitor, the inductor and the switching device are electrically connected to form a loop;
under the condition that the positive output end of the battery component is electrically connected with the positive electrode of the battery, the first end of the inductor is electrically connected with the positive electrode of the battery component, the second end of the inductor is connected with the anode of the first diode, and the cathode of the first diode is electrically connected with the positive electrode of the battery;
under the condition that the negative output end of the battery component is electrically connected with the negative electrode of the battery, the first end of the inductor is electrically connected with the negative electrode of the battery component, the second end of the inductor is connected with the cathode of the first diode, and the anode of the first diode is electrically connected with the negative electrode of the battery.
4. The power supply circuit of claim 3, wherein the equalization subcircuit further comprises a second diode connected in parallel with the switching device and having a conduction direction opposite to that of the switching device.
5. The power supply circuit of claim 1, wherein any one of the battery packs comprises one battery or a plurality of batteries connected in series.
6. The power supply circuit of claim 1, wherein the detection circuit comprises:
the voltage detection circuit is electrically connected with the corresponding battery assembly and is used for detecting the voltage of the corresponding battery assembly; the voltage detection circuit is electrically connected with the controller and is used for transmitting an input signal of the voltage detection circuit to the controller;
the current detection circuit is electrically connected with the corresponding battery assembly and is used for detecting the current of the corresponding battery assembly; the current detection circuit is electrically connected with the controller and is used for transmitting an input signal of the current detection circuit to the controller.
7. The power supply circuit according to claim 6, wherein the voltage detection circuit comprises a first amplifier, a second amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, and an eighth resistor;
the first amplifier comprises a first positive input end, a first negative input end, a first output end, a first positive power supply end and a first negative power supply end; the first positive input end is grounded through the fourth resistor; the first negative input end is electrically connected with the negative electrode of the battery assembly through the first resistor and the second resistor, and the common end of the first resistor and the second resistor is grounded through the third resistor; the first output end is connected with the first negative input end through the fifth resistor; the first positive power supply end is electrically connected with a first external power supply, and the first negative power supply end is grounded;
the second amplifier comprises a second positive input end, a second negative input end, a second output end, a second positive power supply end and a second negative power supply end; the second positive input end is grounded through the eighth resistor; the second negative input end is electrically connected with the first output end through the sixth resistor; the second output end is electrically connected with the second negative input end through the seventh resistor; the second positive power supply end is electrically connected with a second external power supply, and the second negative power supply end is grounded; the second output end is electrically connected with the controller.
8. The power supply circuit of claim 6, wherein the current detection circuit comprises: the third amplifier comprises a third positive input end, a third negative input end, a third output end, a third positive power supply end and a third negative power supply end;
the ninth resistor is connected in series with the battery assembly; one end of the ninth resistor is electrically connected with the third positive input end, and the other end of the ninth resistor is electrically connected with the third negative input end; the third output end is electrically connected with the controller; the third positive power supply end is electrically connected with a third external power supply, and the third negative power supply end is grounded.
9. The power supply circuit according to claim 3, wherein the switching device is a field effect MOS transistor.
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