CN117452161A - Insulation detection circuit for energy storage converter - Google Patents
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- CN117452161A CN117452161A CN202311450015.3A CN202311450015A CN117452161A CN 117452161 A CN117452161 A CN 117452161A CN 202311450015 A CN202311450015 A CN 202311450015A CN 117452161 A CN117452161 A CN 117452161A
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- 238000001514 detection method Methods 0.000 title claims abstract description 79
- 238000009413 insulation Methods 0.000 title claims abstract description 54
- 238000004146 energy storage Methods 0.000 title claims abstract description 36
- 238000012545 processing Methods 0.000 claims abstract description 34
- 230000001143 conditioned effect Effects 0.000 claims abstract description 6
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention relates to an insulation detection circuit for an energy storage converter, and belongs to the technical field of power electronics. The circuit comprises a control module, an acquisition module, a data processing module, a first detection module and a second detection module, wherein the first detection module is arranged between the positive electrode and the grounding end of a direct current busbar of the energy storage converter, the second detection module is arranged between the negative electrode and the ground of the direct current busbar, the control module comprises a second switch and a third switch, the second switch and the third switch are respectively arranged between the positive electrode and the grounding end of the direct current busbar and between the negative electrode and the grounding end of the busbar, the voltage in corresponding states is acquired through controlling the second switch and the third switch, the acquisition module conditions the voltage on the first detection module and the second detection module, the conditioned voltage is sent to the data processing module, and the data processing module respectively calculates the insulation resistance of the positive electrode and the negative electrode of the direct current busbar to the ground according to the received voltage value. The circuit can accurately detect the insulation performance.
Description
Technical Field
The invention relates to an insulation detection circuit for an energy storage converter, and belongs to the technical field of power electronics.
Background
Along with the proposal of the 'two carbon' development strategy target in China, the development of a power system taking new energy as main power becomes a future development trend and consensus, and the demand of the converter in the new energy market is increasing. The voltage between the positive electrode and the negative electrode of the direct current busbar of the energy storage converter is very high, and if insulation short circuit is caused between the energy storage converter and the ground, the converter has insulation faults. The insulation fault of the converter is a serious hazard, which can cause hazard to the normal operation of the converter, the equipment is destroyed when the converter is light, and the personal safety is damaged when the converter is heavy. If the insulation state of the direct current busbar of the energy storage converter can be detected, the insulation state can be obtained at the first time, the stable operation of equipment is ensured, the personal safety is protected to the maximum extent, and the insulation detection of the direct current busbar of the energy storage converter is particularly important.
Disclosure of Invention
The invention aims to provide an insulation detection circuit for an energy storage converter, which is used for solving the problems of low equipment safety and personal safety hazard caused by poor insulation of a direct current busbar of the energy storage converter.
In order to achieve the above object, the present invention provides a method comprising:
the invention discloses an insulation detection circuit for an energy storage converter, which comprises a control module, an acquisition module, a data processing module, a first detection module and a second detection module, wherein the first detection module is arranged between the positive electrode and the grounding end of a direct current busbar of the energy storage converter, the first detection module comprises a first voltage dividing resistance module connected in series, the second detection module is arranged between the negative electrode and the ground of the direct current busbar, the second detection module comprises a second voltage dividing resistance module connected in series, the control module comprises a second switch and a third switch, the second switch and the third switch are respectively arranged between the positive electrode and the grounding end of the direct current busbar and between the negative electrode and the grounding end of the busbar, the voltages in corresponding states are acquired through controlling the second switch and the third switch, the acquisition module is used for conditioning the voltages on the acquired first detection module and the second detection module in different states, the conditioned voltages are sent to the data processing module, and the data processing module is used for respectively calculating insulation resistances of the positive electrode and the negative electrode of the direct current busbar to the ground according to received voltage values.
The beneficial effects are that: the invention discloses an insulation detection circuit for an energy storage converter, which comprises an acquisition module, two detection modules, a control module, an acquisition module and a data processing module, wherein the two detection modules are used for detecting the voltages of a positive busbar and a negative busbar to the ground, the two acquisition modules are used for respectively acquiring the voltages at two ends of the two detection modules, the data processing module is used for processing the voltages to obtain insulation resistance values, and the insulation performance of the positive busbar and the negative busbar to the ground can be detected. The detection logic of the circuit is simple in design and high in detection accuracy, and can timely detect that the insulation performance of the positive and negative electrode busbar of the energy storage converter to the ground is abnormal, so that stable operation of equipment is ensured, and personal safety is protected to the greatest extent.
Further, the first voltage dividing resistor module at least comprises a first resistor and a second resistor which are connected in series, the first resistor is far larger than the second resistor, and the acquisition module is used for acquiring voltages at two ends of the second resistor; the second voltage dividing resistor module at least comprises a third resistor and a fourth resistor which are connected in series, the third resistor is far larger than the fourth resistor, and the acquisition module is used for acquiring voltages at two ends of the fourth resistor.
The beneficial effects are that: the resistance of the detected second resistor in the first voltage dividing resistor module is far smaller than that of the first resistor used for voltage division, the voltage values of the positive electrode and the grounding end of the busbar can be determined through the voltages of the two ends of the detected second resistor, the third resistor is also far smaller than that of the fourth resistor, the voltage values of the negative electrode and the grounding end of the busbar are determined through the voltages of the two ends of the detected fourth resistor, and the voltage value born by the acquisition module is relatively low due to the fact that the voltage of energy storage output is relatively high, the voltage dividing effect can be achieved by setting the first resistor and the third resistor with large resistance, and the acquired voltage is relatively accurate.
Further, the second resistor and the fourth resistor are potentiometers.
The beneficial effects are that: the second resistor and the fourth resistor are both potentiometers, the potentiometers are adjustable, when the energy storage voltage is unstable, the voltage input into the acquisition module is also unstable, devices in the acquisition module can only bear the voltage in a certain range, and the devices in the acquisition module are prevented from being burnt by installing the potentiometers and adjusting the voltage.
Further, the collecting module comprises a positive collecting unit, the positive collecting unit comprises a voltage follower and a reverse circuit which are connected in series, the input end of the voltage follower is connected with the output end of the first detecting module, the output end of the voltage follower is connected to the reverse circuit and used for buffering impedance, the voltage follower adopts a first operational amplifier, the output end of the reverse circuit is connected to the data processing module and used for amplifying a voltage value output by the voltage follower, and the reverse circuit adopts a second operational amplifier.
The beneficial effects are that: the positive electrode collecting unit of the collecting module can collect the voltage of the first detecting module, namely the voltage value of the positive electrode busbar to the ground, the voltage value born by the collecting module is lower due to the fact that the voltage output by the energy storage is higher, the resistance voltage division with a large resistance value is needed, the corresponding impedance is larger, the voltage follower buffers the impedance, and the reverse circuit can amplify the circuit.
Further: the positive electrode acquisition unit further comprises a zeroing circuit, the zeroing circuit is connected with the reverse circuit and comprises a third operational amplifier and a potential regulator, the reverse input end of the third operational amplifier is connected to the reverse circuit, the output end of the third operational amplifier is connected to the voltage acquisition module, and the potential regulator is arranged at the power input end of the third operational amplifier and used for zeroing correction before insulation detection.
The beneficial effects are that: the positive electrode acquisition unit further comprises a zeroing circuit, the zeroing circuit calibrates the detection module and the acquisition module before insulation detection, and the situation that insulation resistance errors obtained in the detection process are too large, accuracy is too low and insulation performance judgment to the ground is affected is avoided.
Further, the collecting module further comprises a negative electrode collecting unit, the negative electrode collecting unit comprises a voltage follower and a zeroing circuit which are connected in series, the input end of the voltage follower is connected to the output end of the second detecting module, the output end of the voltage follower is connected to the zeroing circuit, and the output end of the zeroing circuit is connected to the data processing module.
The beneficial effects are that: the negative electrode collecting unit of the collecting module can collect the voltage of the second detecting module, namely the voltage value of the negative electrode busbar to the ground, the zero-setting circuit is accurately adjusted and calibrated through the buffer impedance of the voltage follower, and then the insulation resistance of the negative electrode busbar to the ground can be obtained.
Further, the second switch and the third switch are interlocked.
The beneficial effects are that: the two switches are in an interlocking state, so that short circuit between the positive electrode and the negative electrode of the direct current busbar is prevented when the two detection modules are simultaneously conducted in the detection process.
Further, the second switch and the third switch are both optocouplers.
The beneficial effects are that: the action response of the optocoupler relay is rapid, and the control is more sensitive.
Further, the data processing module adopts an MCU.
Drawings
Fig. 1 is a schematic diagram of an insulation detection principle of an energy storage converter according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an optocoupler circuit according to an embodiment of the invention;
FIG. 3 is a schematic diagram of a signal conditioning circuit in an embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of an MCU in an embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
Insulation detection circuit embodiment for energy storage converter:
the invention mainly aims to provide an insulation detection circuit for an energy storage converter, which comprises a detection module for respectively detecting voltages between the positive electrode, the negative electrode and the grounding end of a direct current busbar of the energy storage converter, a control module for controlling the detection module, and a collection module for collecting voltages between the positive electrode, the negative electrode and the grounding end of the direct current busbar, wherein the voltages obtained by the collection module are sent to a data processing module after being conditioned, insulation resistances of the positive electrode and the negative electrode of the direct current busbar to the ground are respectively calculated through the data processing module, and insulation properties of the positive electrode and the negative electrode of the direct current busbar to the ground at the moment are judged.
The insulation detection circuit for the energy storage converter comprises a control module, an acquisition module, a data processing module, a first detection module and a second detection module, wherein the first detection module is arranged between the positive electrode and the grounding end of the direct current busbar of the energy storage converter, the second detection module is arranged between the negative electrode and the grounding end of the direct current busbar, the control module comprises a second switch and a third switch, the second switch and the third switch are respectively arranged between the positive electrode and the grounding end of the direct current busbar and between the negative electrode and the grounding end of the busbar, the voltages in corresponding states are acquired through controlling the second switch and the third switch, the acquisition module is used for conditioning the voltages on the first detection module and the second detection module in different acquired states, the conditioned voltages are sent to the data processing module, and the data processing module is used for respectively calculating insulation resistances of the positive electrode and the negative electrode of the direct current busbar to the ground according to the received voltage values.
Specifically, one end of the first detection module is connected to the positive electrode (cl+) of the direct current busbar, and the other end of the first detection module is grounded and comprises a first voltage dividing resistor module connected in series. One end of the second detection module is connected to the negative electrode (CL-) of the direct current busbar, and the other end of the second detection module is grounded and comprises a second voltage-dividing resistor module which is connected in series. As shown in fig. 3, since the voltage value of the stored energy output is very large, and the voltage value that the device in the acquisition module can bear in the detection process is relatively small, before each device entering the acquisition module is conditioned, a resistor with a relatively large resistance is required to be used for voltage division, and meanwhile, the voltage between the positive electrode of the direct current busbar and the ground can be measured through the voltage dividing resistor between the positive electrode of the direct current busbar and the ground. The first voltage dividing resistor module at least comprises a first resistor R1 and a second resistor W1 which are connected in series, the resistance value of the first resistor for dividing voltage is far larger than that of the second resistor, the acquisition module is used for acquiring the voltage at two ends of the second resistor W1, and the voltage between the busbar anode and the ground is pushed out through the voltage at two ends of the second resistor W1. The second voltage dividing resistor module at least comprises a third resistor R3 and a fourth resistor W2 which are connected in series, wherein the third resistor R3 for voltage division is far greater than the fourth resistor W2, and the acquisition module is used for acquiring the voltages at two ends of the fourth resistor W2. Because the energy storage voltage is unstable, the voltage input into the acquisition module is also unstable, and devices in the acquisition module can only bear voltage within a certain range, in order to enable the voltages of other components in the acquisition module to be stable, the second resistor W1 and the fourth resistor W2 are potentiometers.
The acquisition module comprises a positive electrode acquisition unit and a negative electrode acquisition unit. The positive electrode acquisition unit comprises a voltage follower and a reverse circuit which are connected in series, wherein the input end of the voltage follower is connected with the output end of the first detection module, the output end of the voltage follower is connected to the reverse circuit and used for buffering impedance, the voltage follower adopts a first operational amplifier, the output end of the reverse circuit is connected to the data processing module and used for amplifying a voltage value output by the voltage follower, and the reverse circuit adopts a second operational amplifier. In order to avoid that the insulation resistance error obtained in the detection process is too large and is too low, the insulation performance judgment on the ground is affected, the positive electrode acquisition unit further comprises a zeroing circuit, the zeroing circuit is connected with a reverse circuit and comprises a third operational amplifier and a potential regulator, the reverse circuit is connected with the reverse circuit through the inverting input end of the third operational amplifier, the output end of the third operational amplifier is connected with the voltage acquisition module, and the potential regulator is arranged at the power input end of the third operational amplifier and used for zeroing correction before insulation detection.
Specifically, the voltage follower adopts an in-phase operational amplifier, the in-phase input end of the in-phase operational amplifier is connected with the output end of the first detection module, and the output end of the in-phase operational amplifier is connected to the reversing circuit to buffer the input impedance. The inverting circuit comprises a first inverting operational amplifier, the inverting input end of the first inverting operational amplifier is connected with the output end of the voltage follower, the output end of the first inverting operational amplifier is connected to the zeroing circuit, the zeroing circuit comprises a second inverting operational amplifier and a potential regulator, the inverting input end of the second inverting operational amplifier is connected to the inverting circuit, the output end of the second inverting operational amplifier is connected to the data processing module, and the potential regulator W6 is arranged at the input end of the first inverting operational amplifier and used for regulating resistance and then regulating voltage to calibrate.
The negative electrode acquisition unit comprises a voltage follower and a zeroing circuit which are connected in series, wherein the input end of the voltage follower is connected to the output end of the second detection module, the output end of the voltage follower is connected to the zeroing circuit, and the output end of the zeroing circuit is connected to the data processing module.
Specifically, the voltage follower adopts an in-phase operational amplifier, the in-phase input end of the in-phase operational amplifier is connected with the output end of the second detection module, the output end of the in-phase operational amplifier is connected to a zeroing circuit, the zeroing circuit comprises a potentiometer W7 and a third inverting operational amplifier, the inverting input end of the third inverting operational amplifier is connected to the voltage follower, and the output end of the third inverting operational amplifier is connected to the data processing module. The potentiometer W7 is arranged at the input end of the third inverting operational amplifier and is used for adjusting the resistance, further adjusting the voltage and carrying out calibration.
In order to prevent short circuit between the positive and negative poles of the direct current busbar when the two detection modules are simultaneously conducted in the detection process, the second switch and the third switch in the control module are in an interlocking state, namely, only one or all of the second switch and the third switch are required to be conducted at any time, and if the first control module U13 and the second control module U10 are simultaneously conducted in the detection process, short circuit can occur between the positive pole (CL+ and the negative pole (CL-) of the direct current busbar. As shown in fig. 2, the first switch, the second switch and the third switch all adopt optocouplers.
In addition, the control module further comprises a first switch, and the first switch is arranged between the positive electrode of the second direct current busbar and the grounding end. The first switch not only can control the switching of the resistor R1, but also can limit the secondary side current of the second switch and the third switch.
The detection circuit further comprises a voltage division module, one end of the voltage division module is connected to the positive electrode of the direct current busbar of the energy storage converter, and the other end of the voltage division module is grounded and used for adjusting the voltage of a loop between the positive electrode of the direct current busbar and the grounding end.
The data processing module in this embodiment adopts the MCU shown in fig. 4. And judging the insulation performance to the ground according to the voltage value received from the voltage acquisition module and the state of the control module, and calculating the insulation resistance of the positive electrode and the negative electrode of the direct current busbar to the ground according to the voltages at the two ends of the first voltage dividing resistor and the second voltage dividing resistor when insulation is abnormal.
Specifically, as shown in fig. 1, rx+ is the insulation resistance to ground of the 1500V positive bus of the converter, rx-is the insulation resistance to ground of the 1500V negative bus, K1 is the first switch, K2 is the second switch, K3 is the third switch, and the insulation detection principle is: when K1 and K2 are closed, K3 is in an open state, the voltage at the two ends of a positive bus Rx+ is U1+, and the voltage at the two ends of a negative bus Rx-is U1-; when K1 and K3 are closed, K2 is in an open state, the voltage at the two ends of the positive bus Rx+ is U2+, and the voltage at the two ends of the negative bus Rx-is U2-. R1 is a first resistor, R2 is a second resistor, and the following equation is obtained according to the node current relation:
let r=r1// r2, u1=u1+, u2=u1-, u3=u2+, u4=u2-, the insulation resistance of the positive and negative bus bars to ground can be calculated:
the first resistor R1 and the second resistor R2 are designed with constant values, for example, the first resistor R1 may be 225kΩ, the second voltage dividing resistor R2 is 2.25mΩ, the divided voltages are collected by the collecting module, and the voltages U1 to U4 can be calculated by the data processing module. The insulation resistance of the positive bus and the negative bus to the ground can be calculated through the process.
In this embodiment, the acquisition module is divided into three parts, the first part is a voltage follower, the second part is a reverse circuit, and the third part is a zeroing circuit. The voltage follower in this embodiment is composed of an in-phase operational amplifier, and the voltage follower is generally used as a buffer stage and an isolation stage, because the input impedance of the voltage follower is generally high, usually several kiloohms and above, the input resistance of the voltage follower is very large, but the output resistance is very low, and the output voltage is the same as the input voltage. The voltage of the first portion can be calculated as v2=v1 according to the input-output relationship of the voltage follower. The second part is an inverse circuit adopting an inverse operational amplifier, and the second part is obtained according to the virtual short-circuit and virtual disconnection characteristics of the operational amplifier:
Vn＝Vp (6)
wherein Vp is equal to the voltage of the ground terminal, i.e., 0, as can be seen from equations (5) and (6):
in the third section, cl+ and CL-are short-circuited by adjusting the potentiometers W6 and W7, the voltage of V4 with respect to GND is measured by using a voltmeter, zero point correction is performed by making the voltage of V4 with respect to GND zero, and the voltage at the voltage division point of the potentiometers W6 is assumed to be V5, and the voltage is obtained according to the virtual short-to-virtual break characteristic of the operational amplifier and the node current method:
Vn＝Vp (9)
and Vp is equal to GND, then it is possible to:
and then V4 in the formula (10) is input into an ADC for AD conversion, a voltage acquisition module acquires voltage VML1 (namely V4) at the output end of the zeroing circuit, voltage V3 output by a reverse circuit is reversely pushed out, voltage V2 output by a voltage follower is reversely pushed out by the voltage V3, the input voltage of the voltage follower is equal to the output voltage, so that the input voltage V1 of the voltage follower is obtained, the voltage is the voltage at two ends of a second resistor W1, the voltage at two ends of a positive bus Rx+ can be calculated according to the voltage at two ends of the second resistor W1 to be U1+, and the voltage at two ends of a negative bus Rx-can be calculated to be U1-by calculating a fourth resistor W2, so that the voltage at two ends of the positive bus Rx+ is U2+, and the voltage at two ends of the negative bus Rx-is U2-. The ADC on the data processing module MCU converts the acquired voltage signal into a signal processed by the data processing module, the acquisition module and the data processing module are in communication connection through the communication module, the MCU IS used for processing and packaging data and uploading the data to the main control board for processing, in order to ensure stability in a severe working condition environment, the communication module adopts RS485 differential communication with stronger anti-interference capability, and TTL (transistor-transistor logic) level output by the MCU IS converted into 485 differential level through the CA-IS3092W chip to ensure stable transmission of the signal. In the invention, the transmitting and receiving control pins of the CA-IS3092W chip are connected together, and a triode IS utilized to control the base electrode of the triode by using the transmitting signal of the MCU so as to control the automatic transmitting and receiving.
Claims (9)
1. The insulation detection circuit for the energy storage converter is characterized by comprising a control module, an acquisition module, a data processing module, a first detection module and a second detection module, wherein the first detection module is used for being arranged between the positive electrode and the grounding end of the direct current busbar of the energy storage converter, the first voltage dividing resistance module is arranged in series, the second detection module is used for being arranged between the negative electrode and the ground of the direct current busbar, the second voltage dividing resistance module is arranged in series, the control module comprises a second switch and a third switch, the second switch and the third switch are respectively arranged between the positive electrode and the grounding end of the direct current busbar and between the negative electrode and the grounding end of the busbar, voltages in corresponding states are acquired through controlling the second switch and the third switch, the acquisition module is used for conditioning the voltages on the first detection module and the second detection module in different acquired states, the conditioned voltages are sent to the data processing module, and the data processing module is used for respectively calculating insulation resistances of the positive electrode and the negative electrode of the direct current busbar to the ground according to received voltage values.
2. The insulation detection circuit for an energy storage converter according to claim 1, wherein the first voltage dividing resistor module at least comprises a first resistor and a second resistor connected in series, the first resistor is far greater than the second resistor, and the acquisition module is used for acquiring voltages at two ends of the second resistor; the second voltage dividing resistor module at least comprises a third resistor and a fourth resistor which are connected in series, the third resistor is far larger than the fourth resistor, and the acquisition module is used for acquiring voltages at two ends of the fourth resistor.
3. The insulation detection circuit for an energy storage converter of claim 2, wherein the second resistor and the fourth resistor are potentiometers.
4. The insulation detection circuit for an energy storage converter according to claim 1, wherein the acquisition module comprises a positive electrode acquisition unit, the positive electrode acquisition unit comprises a voltage follower and a reverse circuit which are connected in series, the input end of the voltage follower is connected with the output end of the first detection module, the output end of the voltage follower is connected to the reverse circuit for buffering impedance, the voltage follower adopts a first operational amplifier, the output end of the reverse circuit is connected to the data processing module for amplifying a voltage value output by the voltage follower, and the reverse circuit adopts a second operational amplifier.
5. The insulation detection circuit for an energy storage converter according to claim 4, wherein the positive electrode acquisition unit further comprises a zeroing circuit connected with the reversing circuit, and comprising a third operational amplifier and a potential regulator, wherein an inverting input end of the third operational amplifier is connected to the reversing circuit, an output end of the third operational amplifier is connected to the voltage acquisition module, and the potential regulator is arranged at a power supply input end of the third operational amplifier for zeroing correction before insulation detection.
6. The insulation detection circuit for an energy storage converter according to claim 1, wherein the acquisition module further comprises a negative acquisition unit, the negative acquisition unit comprises a voltage follower and a zeroing circuit connected in series, the voltage follower input is connected to the output of the second detection module, the output is connected to the zeroing circuit, and the output of the zeroing circuit is connected to the data processing module.
7. The insulation detection circuit for an energy storage converter of claim 1, wherein the second switch and the third switch are interlocked.
8. The insulation detection circuit for an energy storage converter of claim 7, wherein the second switch and the third switch each employ an optocoupler.
9. The insulation detection circuit for an energy storage converter of claim 7, wherein the data processing module employs an MCU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202311450015.3A CN117452161A (en) | 2023-11-02 | 2023-11-02 | Insulation detection circuit for energy storage converter |
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| CN202311450015.3A CN117452161A (en) | 2023-11-02 | 2023-11-02 | Insulation detection circuit for energy storage converter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117665396A (en) * | 2024-01-31 | 2024-03-08 | 徐州徐工汽车制造有限公司 | Insulation resistance detection circuit, method, device and medium for power battery |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117665396A (en) * | 2024-01-31 | 2024-03-08 | 徐州徐工汽车制造有限公司 | Insulation resistance detection circuit, method, device and medium for power battery |
| CN117665396B (en) * | 2024-01-31 | 2024-06-07 | 徐州徐工汽车制造有限公司 | Insulation resistance detection circuit, method, device and medium for power battery |
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