CN115754785A - Storage battery validity detection device and detection method - Google Patents

Abstract

The invention relates to a device and a method for detecting the effectiveness of a storage battery, wherein the device comprises a buck silicon chain, a direct-current contactor, two nodes and a switch, wherein the buck silicon chain is provided with at least two diodes which are connected in series; the direct current contactor is provided with a main contact and an auxiliary contact, the main contact is connected with the voltage reduction silicon chain, and the auxiliary contact is connected with the negative electrode of the direct current bus; two nodes are respectively arranged at two ends of the voltage-reducing silicon chain, wherein one node is connected with the storage battery pack, and the other node is connected with the anode of the direct-current bus; the switch is arranged between the two nodes; when the validity of the storage battery pack is verified, the switch is disconnected so that the main contact of the direct current contactor is in a disconnected state, the output voltage of a direct current bus of the charger is reduced through the voltage reduction silicon chain, and the storage battery pack bears a conventional load for a station so as to verify the conventional loading capacity of the storage battery pack. The invention can realize the on-line monitoring of the effectiveness of the storage battery pack and overcome the technical defects of low overall detection efficiency, high cost and large workload in the prior art.

Description

Storage battery validity detection device and detection method

technical field

The invention relates to the technical field of storage battery detection, in particular to a storage battery validity detection device and detection method.

Background technique

As the working power source of the power protection system, the reliability of the DC power supply system is related to the safety and stability of the power supply of the power grid system. As the core equipment of the DC power supply system, the battery pack provides timely protection power when an AC fault occurs, and maintains the reliable operation of the protection equipment in the power station and power distribution station. Therefore, the reliability of the battery pack is directly related to the power safety of the power system.

Because the battery pack is in the floating charging state online for a long time, it is difficult to judge the performance of the battery pack, such as the decrease in capacity, the increase in internal resistance, and what is more, the battery pole is not connected in time. Once the battery pack is required to be put into use , due to the above problems, the battery pack cannot provide power for the power protection system, which loses its proper meaning, and the whole station will be in a state of deprotection. At present, the only way to monitor the performance of the battery pack is to conduct a verification discharge test on the battery pack. The general cycle is two to three years. A large number of cases prove that during the test period, the battery virtual connection, internal resistance increase, and battery failure often occur. Safety brings certain risks. In addition, this case requires on-site maintenance by personnel, that is, there are problems such as low overall efficiency, high cost, and heavy workload in the qualitative discharge test of the battery pack.

Therefore, there is an urgent need to propose a storage battery validity detection device and detection method to overcome the technical defects of low overall detection efficiency, high cost and heavy workload in the prior art.

Contents of the invention

For this reason, the technical problem to be solved by the present invention is to overcome the technical defects of low overall detection efficiency, high cost and heavy workload in the prior art, and propose a storage battery validity detection device and detection method, which is based on a charger, Under the premise that the battery packs are not separated from the DC system, and without changing the system parameters, the detection of the validity of the battery packs can be completed intelligently, and the online monitoring of the validity of the battery packs can be realized.

In order to solve the above technical problems, the present invention provides a storage battery validity detection device, the detection device is connected to the DC bus of the charger, and the detection device includes:

a step-down silicon chain having at least two diodes connected in series;

A DC contactor, which has a main contact and an auxiliary contact, the main contact is connected to the step-down silicon chain, and the auxiliary contact is connected to the negative pole of the DC bus;

Two nodes, which are respectively arranged at both ends of the step-down silicon chain, one of which is connected to the battery pack, and the other is connected to the positive pole of the DC bus;

A switch, which is arranged between two nodes, realizes switching of the main contact of the DC contactor between a closed state and an open state through the switch;

Wherein, when verifying the validity of the storage battery pack, the switch is turned off, so that the main contact of the DC contactor is in the disconnected state, and the output voltage of the DC bus of the charger is lowered through the step-down silicon chain, so that The battery pack bears the normal load of the station to verify the normal load capacity of the battery pack.

In one embodiment of the present invention, when the storage battery pack is in normal operation, the switch is closed so that the main contact of the DC contactor is in a closed state, so that it short-circuits the step-down silicon chain to Put the storage battery pack in a floating charge state.

In one embodiment of the present invention, at least two diodes connected in series in the step-down silicon chain have the same conduction direction.

In an embodiment of the present invention, among the two nodes, the node set at the positive pole of the step-down silicon chain is connected to the battery pack, and the node set at the negative pole of the step-down silicon chain is connected to the positive pole of the DC bus.

In one embodiment of the present invention, when verifying the validity of the storage battery pack, the switch is turned off so that the main contact of the DC contactor is in an open state, and the voltage of the charger is reduced through the step-down silicon chain. The output voltage of the DC bus makes the battery pack bear the station's regular load. On the basis of the battery pack's bearing the station's regular load, the battery pack is discharged and tested by inputting a simulated load.

In one embodiment of the present invention, after the conventional load capacity of the battery pack is verified as qualified, the impact resistance capability of the battery pack is verified on the basis that the battery pack bears the regular station load.

In one embodiment of the present invention, after the conventional load capacity of the battery pack is verified as qualified, the internal load is intelligently switched on the basis of the battery pack bearing the station's regular load, simulating multiple circuit breakers for simultaneous protection tripping or closing Operating current, and dynamically detect the voltage fluctuation and voltage drop of the DC bus to verify the impact resistance of the battery pack.

In addition, the present invention also provides a battery validity detection method, which is realized by a battery validity detection device as described above, and the method includes:

When the battery pack is in normal operation, close the switch, so that the main contact of the DC contactor is in a closed state, and make it short-circuit the step-down silicon chain, so that the battery pack is in a floating charge state ;

When verifying the validity of the battery pack, the switch is turned off so that the main contact of the DC contactor is in an open state, and the output voltage of the DC bus of the charger is lowered through the step-down silicon chain to make the battery pack The bearing station uses a regular load to verify the regular load capacity of the battery pack.

In one embodiment of the present invention, on the basis that the battery pack bears the station's normal load, the battery pack is subjected to a discharge test by putting in a simulated load.

In one embodiment of the present invention, after the conventional load capacity of the battery pack is verified as qualified, the internal load is intelligently switched on the basis of the battery pack bearing the station's regular load, simulating multiple circuit breakers for simultaneous protection tripping or closing Operating current, and dynamically detect the voltage fluctuation and voltage drop of the DC bus to verify the impact resistance of the battery pack.

The above technical solution of the present invention has the following advantages compared with the prior art:

A storage battery validity detection device and detection method according to the present invention intelligently complete the detection of the validity of the battery pack on the premise that neither the charger nor the storage battery pack is separated from the DC system, and without changing the system parameters The utility model can realize online monitoring of the effectiveness of the storage battery pack, and overcome the technical defects of low overall detection efficiency, high cost and heavy workload existing in the prior art.

Description of drawings

In order to make the content of the present invention more easily understood, the present invention will be described in further detail below according to specific embodiments of the present invention in conjunction with the accompanying drawings, wherein

Fig. 1 is a schematic structural diagram of a storage battery validity detection device proposed by the present invention.

Wherein, the reference signs are explained as follows: 1. Step-down silicon chain; 2. DC contactor; 21. Main contact; 22. Auxiliary contact; 3. Node; 4. Switch; 5. DC bus; 6. Battery pack .

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.

Referring to Fig. 1 , a battery pack validity detection device proposed in an embodiment of the present invention, the detection device is connected to the DC bus 5 of the charger, and the detection device includes a step-down silicon chain 1, a DC contactor 2, Two nodes 3 and a switch 4, the step-down silicon chain 1 has at least two diodes connected in series; a DC contactor 2, which has a main contact 21 and an auxiliary contact 22, the main contact 21 is connected to the Step-down silicon chain 1, the auxiliary contact 22 is connected to the negative pole of the DC bus 5; two nodes 3 are respectively arranged at both ends of the step-down silicon chain 1, one node 3 is connected to the battery pack 6, and the other The node 3 is connected to the positive pole of the DC bus 5; the switch 4 is arranged between the two nodes 3, and the main contact 21 of the DC contactor 2 is switched between the closed state and the open state through the switch 4 Wherein, when verifying the validity of the battery pack 6, the switch 4 is turned off, so that the main contact 21 of the DC contactor 2 is in an open state, and the DC voltage of the charger is reduced through the step-down silicon chain 1 The output voltage of the busbar 5 makes the storage battery pack 6 bear the normal load of the station, so as to verify the normal loading capacity of the storage battery pack 6 .

In the battery pack validity detection device proposed by the present invention, it intelligently completes the validity check of the battery pack 6 on the premise that neither the charger nor the battery pack 6 is separated from the DC system, and does not change the system parameters. The detection can realize the online monitoring of the storage battery pack 6, and overcome the technical defects of low overall detection efficiency, high cost and heavy workload in the prior art.

Wherein, the above-mentioned at least two diodes connected in series have the same conduction direction, specifically, among the two nodes 3, the node 3 set at the anode of the step-down silicon chain 1 is connected to the battery pack 6, and is set at the step-down silicon chain 1. The node 3 of the negative pole of the chain 1 is connected to the positive pole of the DC bus 5 .

In the battery pack effectiveness detection device proposed by the present invention, when the battery pack 6 is in normal operation, the switch 4 is closed, so that the main contact 21 of the DC contactor 2 is in a closed state, so that It short-circuits the step-down silicon chain 1 so that the storage battery pack 6 is in a floating charge state; when the validity of the storage battery pack 6 is verified, the switch 4 is turned off so that the main contact of the DC contactor 2 The point 21 is in the disconnected state, and the output voltage of the DC bus 5 of the charger is lowered through the step-down silicon chain 1, so that the battery pack 6 bears the normal load of the station, so as to verify the normal load capacity of the battery pack 6 . That is to say, the present invention intelligently completes the detection of the validity of the battery pack 6 on the premise that neither the charger nor the battery pack 6 is separated from the DC system, without changing system parameters, and can realize online monitoring of the battery pack 6 .

In the battery pack validity detection device proposed by the present invention, when the validity of the battery pack 6 is verified, the switch 4 is turned off, so that the main contact 21 of the DC contactor 2 is in an open state, Reduce the output voltage of the DC bus 5 of the charger through the step-down silicon chain 1, so that the battery pack 6 bears the conventional load of the station. If the on-site load is too small, a simulated load can be put into the discharge test of the battery pack 6 to quickly Verify the validity and loading capacity of the storage battery pack 6 .

In the validity detection device of the storage battery pack proposed by the present invention, the present invention utilizes the unidirectional conduction and automatic step-down characteristics of the diode, and properly controls the output voltage of the DC bus 5 of the charger under the premise of ensuring that the charger is online. reduce, so that the storage battery pack 6 bears the normal DC load for the station, and verifies the normal load capacity of the storage battery pack 6 .

The above-mentioned battery pack validity detection function means that the validity of the battery pack 6 can be checked automatically and regularly or manually, and the open circuit of the single battery, the failure or disconnection of the battery pack switch 4, the fuse of the battery pack, the disconnection of the connecting wire, Layer line disconnection, loose screws, etc., to verify whether the DC system can bear the normal load, so as to ensure the safe operation of the DC system.

In the battery pack effectiveness detection device proposed by the present invention, after the conventional load capacity of the battery pack 6 is verified as qualified, the impact resistance of the battery pack 6 is verified on the basis that the battery pack 6 bears the station's regular load, That is, on the basis of the battery pack 6 bearing the station's conventional load, intelligently switch internal loads, simulate multiple circuit breakers to protect the tripping or closing action current at the same time, and dynamically detect the voltage fluctuation and voltage drop of the DC bus 5 to verify that the battery pack 6 Shock resistance.

In the validity detection device for battery packs proposed by the present invention, a simulated load is superimposed on the basis of bearing conventional loads, and discharge tests are performed on 6 battery packs to quickly verify the tripping impact load carrying capacity of 6 battery packs .

In the battery pack effectiveness detection device proposed by the present invention, the battery pack 6 can also be periodically discharged shallowly, which can inhibit vulcanization. At the same time, the battery pack 6 can be resonantly Frequency sweeping can play a certain role in eliminating vulcanization of battery plates and restoring battery capacity.

A method for detecting the validity of a battery pack disclosed in an embodiment of the present invention is introduced below. The method for detecting the validity of a battery pack described below and the device for detecting the validity of a battery pack described above can be used for mutual reference.

The embodiment of the present invention also provides a method for detecting the validity of a storage battery pack, which is realized by a device for detecting the validity of a storage battery pack as described above, and the method includes:

When the storage battery pack 6 is in normal operation, close the switch 4, so that the main contact 21 of the DC contactor 2 is in a closed state, and short-circuit the step-down silicon chain 1, so that the storage battery Group 6 is in floating state;

When verifying the validity of the battery pack 6, the switch 4 is turned off so that the main contact 21 of the DC contactor 2 is in an open state, and the voltage of the DC bus 5 of the charger is reduced by the step-down silicon chain 1. output voltage, so that the storage battery pack 6 bears the normal load of the station, so as to verify the normal loading capacity of the storage battery pack 6 .

In one embodiment of the present invention, on the basis that the battery pack 6 bears the station's regular load, the battery pack 6 is subjected to a discharge test by putting in a simulated load.

The method for detecting the validity of a battery pack according to the present invention intelligently completes the detection of the validity of the battery pack 6 on the premise that neither the charger nor the battery pack 6 is separated from the DC system, and without changing system parameters , can realize the on-line monitoring of the storage battery pack 6, and overcome the technical defects of low overall detection efficiency, high cost and heavy workload existing in the prior art.

In the method for detecting the validity of the battery pack proposed by the present invention, when verifying the validity of the battery pack 6, the switch 4 is turned off, so that the main contact 21 of the DC contactor 2 is in an open state, Reduce the output voltage of the DC bus 5 of the charger through the step-down silicon chain 1, so that the battery pack 6 bears the conventional load of the station. If the on-site load is too small, a simulated load can be put into the discharge test of the battery pack 6 to quickly Verify the validity and loading capacity of the storage battery pack 6 .

In the method for detecting the validity of a storage battery pack proposed by the present invention, the present invention utilizes the unidirectional conduction and automatic step-down characteristics of the diode, and properly controls the output voltage of the DC bus 5 of the charger under the premise of ensuring that the charger is online. reduce, so that the storage battery pack 6 bears the normal DC load for the station, and verifies the normal load capacity of the storage battery pack 6 .

The above-mentioned battery pack validity detection function means that the validity of the battery pack 6 can be checked automatically and regularly or manually, and the open circuit of the single battery, the failure or disconnection of the battery pack switch 4, the fuse of the battery pack, the disconnection of the connecting wire, Layer line disconnection, loose screws, etc., to verify whether the DC system can bear the normal load, so as to ensure the safe operation of the DC system.

In one embodiment of the present invention, when the conventional load capacity of the battery pack 6 is verified to be qualified, the internal load is intelligently switched on the basis of the battery pack 6 bearing the station's regular load, simulating multiple circuit breakers to simultaneously protect and trip or Closing action current, and dynamically detect the voltage fluctuation and voltage drop of the DC bus 5 to verify the impact resistance of the battery pack 6 .

In a method for detecting the effectiveness of battery packs proposed by the present invention, a simulated load is superimposed on the basis of bearing conventional loads, and a discharge test is performed on 6 battery packs to quickly verify the tripping impact load carrying capacity of 6 battery packs .

In the method for detecting the validity of the battery pack proposed by the present invention, the battery pack 6 can also be periodically discharged shallowly, which can play a role in inhibiting vulcanization. At the same time, the battery pack 6 can be resonantly Frequency sweeping can play a certain role in eliminating vulcanization of battery plates and restoring battery capacity.

A storage battery validity detection method in this embodiment is realized by the aforementioned storage battery validity detection device, so the specific implementation of the method can be seen in the embodiment part of a storage battery validity detection device above, so its specific For the implementation manner, reference may be made to the descriptions of the corresponding parts of the embodiments, which will not be further introduced here.

In addition, since a storage battery validity detection method in this embodiment is implemented by the aforementioned storage battery validity detection device, its functions correspond to those of the above-mentioned device, and will not be repeated here.

Apparently, the above-mentioned embodiments are only examples for clear description, and are not intended to limit the implementation. For those of ordinary skill in the art, on the basis of the above description, other changes or changes in various forms can also be made. It is not necessary and impossible to exhaustively list all the implementation manners here. However, the obvious changes or changes derived therefrom are still within the scope of protection of the present invention.

Claims (10)

1. A storage battery validity detection device, the detection device is connected to the DC bus of the charger, characterized in that: the detection device includes: a step-down silicon chain having at least two diodes connected in series; A DC contactor, which has a main contact and an auxiliary contact, the main contact is connected to the step-down silicon chain, and the auxiliary contact is connected to the negative pole of the DC bus; Two nodes, which are respectively arranged at both ends of the step-down silicon chain, one of which is connected to the battery pack, and the other is connected to the positive pole of the DC bus; A switch, which is arranged between two nodes, realizes switching of the main contact of the DC contactor between a closed state and an open state through the switch; Wherein, when verifying the validity of the storage battery pack, the switch is turned off, so that the main contact of the DC contactor is in the disconnected state, and the output voltage of the DC bus of the charger is lowered through the step-down silicon chain, so that The battery pack bears the normal load of the station to verify the normal load capacity of the battery pack. 2. A storage battery validity detection device according to claim 1, characterized in that: when the storage battery pack is operating normally, the switch is closed so that the main contact of the DC contactor is in a closed state, Make it short-circuit the voltage-reducing silicon chain, so that the storage battery pack is in a state of floating charge. 3. The storage battery validity detection device according to claim 1 or 2, characterized in that at least two diodes connected in series in the step-down silicon chain have the same conduction direction. 4. A storage battery validity detection device according to claim 1 or 2, characterized in that: among the two nodes, the node set at the positive pole of the step-down silicon chain is connected to the battery pack, and is set at the node of the step-down silicon chain The node of the negative pole is connected to the positive pole of the DC bus. 5. A storage battery validity detection device according to claim 1, characterized in that: when verifying the validity of the battery pack, the switch is turned off so that the main contact of the DC contactor is in an open state , the output voltage of the DC bus of the charger is lowered through the step-down silicon chain, so that the battery pack bears the regular load for the station, and on the basis of the battery pack bearing the regular load for the station, the battery pack is subjected to a discharge test by inputting a simulated load. 6. A storage battery validity detection device according to claim 1, characterized in that: after the conventional load capacity of the storage battery is verified as qualified, the impact resistance of the storage battery is verified on the basis that the storage battery bears the conventional load for the station ability. 7. A storage battery validity detection device according to claim 6, characterized in that: after the conventional load capacity of the storage battery pack is verified as qualified, the internal load is intelligently switched on the basis of the storage battery pack bearing the regular station load Simulate multiple circuit breakers to protect the tripping or closing action current at the same time, and dynamically detect the voltage fluctuation and voltage drop of the DC bus to verify the shock resistance of the battery pack. 8. A battery validity detection method, characterized in that: the method is realized by a storage battery validity detection device according to any one of claims 1-7, the method comprising: When the battery pack is in normal operation, close the switch, so that the main contact of the DC contactor is in a closed state, and make it short-circuit the step-down silicon chain, so that the battery pack is in a floating charge state ; When verifying the validity of the battery pack, the switch is turned off so that the main contact of the DC contactor is in an open state, and the output voltage of the DC bus of the charger is lowered through the step-down silicon chain to make the battery pack The bearing station uses a regular load to verify the regular load capacity of the battery pack. 9 . The method for detecting the validity of a storage battery according to claim 8 , wherein the discharge test is performed on the storage battery by inputting a simulated load on the basis that the storage battery bears the normal station load. 10 . 10. A battery validity detection method according to claim 8, characterized in that: after the conventional load capacity of the battery pack is verified as qualified, the internal load is intelligently switched on the basis of the battery pack bearing the station's regular load Simulate multiple circuit breakers to protect the tripping or closing action current at the same time, and dynamically detect the voltage fluctuation and voltage drop of the DC bus to verify the shock resistance of the battery pack.

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