CN115184794B - Relay adhesion detection method and device for multi-cluster battery system - Google Patents

Abstract

The invention discloses a relay adhesion detection method for a multi-cluster battery system. The adhesion detection method is specifically as follows: according to the working state of the multi-cluster battery system, determine the bus cluster in the multi-cluster battery system; The voltage difference or loop current value is used to detect the adhesion state of the relays in the bus cluster; the adhesion state of the relays in the remaining battery clusters in the multi-cluster battery system is detected by the loop current value. The invention can solve the problem that the adhesion failure detection cannot be performed when the multi-cluster battery systems are connected in parallel, and at the same time, it can accurately detect the adhesion state of the relay in the multi-cluster battery system, reduce the overall operation risk of the system, and avoid the multi-cluster battery system. Charging and over-discharging phenomenon.

Description

A method and device for detecting relay adhesion in a multi-cluster battery system

technical field

The invention relates to the technical field of novel power storage systems, in particular to a method and device for detecting relay adhesion of a multi-cluster battery system.

Background technique

Existing large-scale energy storage systems generally consist of multiple packs (module management unit BMU) to form a single battery cluster (cluster control management unit BCU), multiple battery clusters to form a single battery stack (stack control management unit BSU), and multiple The battery is stacked in a container, and then communicates with the EMS (Energy Management System) to manage the charging and discharging of the system. The cluster control management unit BCU is generally installed in a high-voltage box, and the high-voltage box also includes a total negative relay, a total positive relay, a pre-charge relay, a pre-charge resistor, and a current sensor (Hall or shunt). Before the cluster control management unit BCU is powered on at high voltage, it is necessary to detect whether there is any adhesion fault in the total positive, total negative and pre-charge relays. When the relay is disconnected, when the back-end voltage accounts for more than 90% of the front-end voltage difference (can be calibrated according to the total pressure detection accuracy), it is considered that the relay has a sticking fault. However, the disadvantage of this method is that when the high-voltage circuit of a cluster control management unit BCU is already closed, since all the cluster control management units BCU are connected in parallel, the relays of other clusters except the cluster that has been powered on with high voltage have high voltage. The values of the sampling points are equal to the total voltage of the battery cluster, so this method cannot be used to detect adhesion faults.

Contents of the invention

In order to solve the technical problems existing in the background technology, the present invention proposes a relay adhesion detection method and equipment for a multi-cluster battery system, so as to accurately detect the adhesion status of relays in a multi-cluster battery system and reduce the overall operation risk of the system.

A method for detecting relay adhesion of a multi-cluster battery system proposed by the present invention, the method for detecting adhesion is specifically as follows:

Determine the busbar clusters in the multi-cluster battery system according to the working status of the multi-cluster battery system;

Detecting the adhesion state of the relays in the bus cluster;

The stuck state of the relays in the remaining battery clusters in the multi-cluster battery system is detected by a loop current value.

Furthermore, the busbar clusters in the multi-cluster battery system are determined, as follows:

initializing the multi-cluster battery system;

Sampling and acquiring the voltage of each battery cluster in the multi-cluster battery system;

Detect the state of the high-voltage relay of each battery cluster, and determine all the battery clusters in the state of the high-voltage relay without interruption;

From the sampling voltages corresponding to all the battery clusters in the uninterrupted high voltage relay state, determine the battery cluster in the uninterrupted high voltage relay state corresponding to the minimum sampling voltage, and the battery cluster in the uninterrupted high voltage relay state corresponding to the minimum sampling voltage is a bus cluster .

Furthermore, the relays in the busbar cluster are detected through the voltage difference between the front and rear ends of the relays, specifically as follows:

Sampling and obtaining the voltage of the relay to be tested in the bus cluster, and comparing the voltage with a preset voltage, and when the voltage is not less than the preset voltage, then perform the next step, otherwise, repeat this step;

Obtain the proportion of the rear-end voltage and the front-end voltage of the relay to be tested according to the front-end and rear-end sampling voltages of the relay to be tested, and compare the proportion with the preset voltage proportion, and judge the bus according to the comparison result The status of the relays under test in the cluster.

Furthermore, the relays in the busbar cluster are detected through the loop current value, specifically as follows:

Obtain the loop current of the bus cluster, and simultaneously set high-voltage sampling points at the front and rear ends of the relay to be tested in the bus cluster, and obtain the sampling voltages at the front and rear ends of the relay to be tested;

Comparing the loop current of the bus cluster with a preset first current value, and judging the state of the relay to be tested in the bus cluster according to the comparison result.

Furthermore, the state of the relay to be tested in the bus cluster is judged, specifically as follows:

When the rear-end voltage ratio of the relay to be tested is not less than the preset voltage ratio, or the loop current of the bus cluster is greater than the preset first current value, the relays in the bus cluster are stuck state, otherwise, the relay to be tested is not in a sticking state.

Furthermore, the relays in the remaining battery clusters in the multi-cluster battery system are detected through the loop current value, specifically as follows:

Disconnecting the remaining battery cluster circuits, and obtaining the current value of the disconnected battery cluster circuits;

Comparing the current value of the disconnected battery cluster loop with a preset second current value, when the current value is greater than the preset second current value, the relay in the battery cluster corresponding to the current value If it is in the sticking state, otherwise, it will return that the relay in the battery cluster corresponding to the current value is not in the sticking state.

Furthermore, the preset voltage ratio is set according to the total voltage detection accuracy of the multi-cluster battery system;

Both the preset first current value and the preset second current value are set according to the accuracy difference of the current sensors.

A relay adhesion detection device for a multi-cluster battery system, the detection device comprising:

The clustering module is used to determine the busbar clusters in the multi-cluster battery system;

The first detection module is used to detect the state of the relays in the bus cluster according to the voltage difference between the front and rear ends of the relay or the loop current value;

The second detection module is used to detect the states of the relays in the remaining battery clusters in the multi-cluster battery system except the bus cluster according to the loop current value.

A storage medium, wherein a computer program is stored in the storage medium, and the computer program is configured to perform the method described in any one of the above when running.

An electronic device includes a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to run the computer program to perform the method described in any one of the above.

Beneficial effects: Compared with the prior art, the technical solution of the present invention has the following beneficial technical effects:

(1) The relay adhesion detection method for a multi-cluster battery system proposed in the present invention can divide all battery clusters by using the equipment in the existing high-voltage box when the high-voltage circuit of any battery cluster is closed, and pass The voltage difference between the front and back ends of the relay or the loop current value detects the divided battery clusters separately, so that it can solve the problem that the adhesion fault cannot be detected when the multi-cluster battery system is connected in parallel, and then it can be realized in the multi-cluster battery system. Accurate detection The adhesion state of the relay reduces the risk of the overall operation of the system and avoids overcharging and overdischarging in the multi-cluster battery system;

(2) The relay adhesion detection method of the multi-cluster battery system proposed in the present invention does not need to use a DC high-voltage relay with auxiliary contacts, and the hardware circuit is simple, and there is no need to add a new hardware circuit. Sticking state detection is possible, which can significantly reduce system cost.

Description of drawings

Fig. 1 is an energy storage system architecture diagram of an embodiment of a relay adhesion detection method for a multi-cluster battery system proposed by the present invention;

2 is a schematic flow diagram of an embodiment of a method for detecting relay adhesion in a multi-cluster battery system proposed by the present invention;

FIG. 3 is a single-cluster system architecture diagram of an embodiment of a method for detecting relay adhesion in a multi-cluster battery system proposed by the present invention.

detailed description

The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

Example 1

An embodiment of the present invention provides a relay adhesion detection method for a multi-cluster battery system, which can be applied to electric boat systems, and can also be applied to application fields such as heavy trucks and vehicles.

As shown in FIG. 1 , FIG. 1 is an energy storage system architecture diagram of an embodiment of a method for detecting relay adhesion in a multi-cluster battery system proposed by the present invention. It can be seen from Figure 1 that in the existing large-scale energy storage system, a battery cluster, namely the cluster control management unit BCU, is composed of multiple packs, namely the module management unit BMU, and a battery stack, namely the stack control management unit BSU, is composed of multiple battery clusters That is, the cluster control management unit BCU is composed. A container is composed of multiple battery stacks, namely the stack control management unit BSU. At the same time, the container can communicate with the energy management system EMS to manage the charging and discharging of the large energy storage system.

Referring to FIG. 2 , FIG. 2 is a schematic flowchart of an embodiment of a method for detecting relay adhesion in a multi-cluster battery system proposed by the present invention. An embodiment of the present invention provides a relay adhesion detection method for a multi-cluster battery system, which can be applied to electric boat systems, and can also be applied to application fields such as heavy trucks and vehicles.

Referring to FIG. 2, it can be seen from FIG. 2 that an embodiment of the present invention provides a relay adhesion detection method for a multi-cluster battery system. The adhesion detection method is specifically as follows:

Step S1: According to the working status of the multi-cluster battery system, determine the busbar cluster that needs to be specified from the multi-cluster battery system. The specific process is as follows:

Step S1.1: Power on the cluster control management unit BCU at low voltage, and initialize the system program of the cluster control management unit BCU, so as to ensure that the logic state of all relays in the cluster control management unit BCU is off open state.

Step S1.2: Place a high-voltage sampling point in the loop of each battery cluster in the multi-cluster battery system, obtain the voltage of each battery cluster through the sampling point, and send the sampled voltage of each battery cluster to the stack controller Snap in BSU.

Step S1.3: Since a stack control management unit BSU is composed of multiple battery clusters, the stack control management unit BSU can receive the information of all the battery clusters it consists of, such as the status of the high voltage relay in each battery cluster.

It is worth noting that, in this embodiment, the stack control management unit BSU detects the status of the high-voltage relays uploaded by all the battery clusters it consists of, and determines all the battery clusters without serious faults. Specifically, the so-called battery clusters without serious faults here refer to the battery clusters without high voltage relay failure.

Step S1.4: It can be known from step S1.3 that the stack control management unit BSU can determine all the battery clusters in the uninterruptible high voltage relay state from all the battery clusters formed. Since in step S1.2, the sampling voltages of all battery clusters are sent to the stack control management unit BSU, the stack control management unit BSU can determine the sampling voltages corresponding to all battery clusters in the state of the uninterruptible high voltage relay, and The determined sampling voltages are sorted. In this embodiment, the sampling voltages are sorted in descending order, and according to the size of the sorted sampling voltages, the battery cluster corresponding to the minimum sampling voltage in the uninterrupted high-voltage relay state is determined. At this time, the minimum sampling voltage The battery cluster corresponding to the state of the uninterrupted high voltage relay is the bus cluster to be determined.

It is worth noting that the sorting order here is not fixed, it can also be sorted in other orders, and there is no special sorting requirement.

Step S2: Detect the relays in the bus cluster determined in step S1.4 by detecting the voltage difference between the front and rear ends of the relays or the loop current value. Referring to FIG. 3 , FIG. 3 is a single-cluster system architecture diagram of an embodiment of a method for detecting relay adhesion in a multi-cluster battery system proposed by the present invention. Specifically, this embodiment will describe the state detection process of the relays in the bus cluster in step S2 in conjunction with the single-cluster system architecture diagram in FIG. 3 , as follows:

Step S2.1: Referring to FIG. 3 , in this embodiment, the sampling voltage V1 at the rear end of the pre-charging relay is obtained by sampling with a voltmeter, and the sampling voltage V1 at the rear end of the pre-charging relay is compared with the preset voltage. Specifically, when the sampling voltage V1 at the rear end of the pre-charging relay is not less than the preset voltage, the next step S2.2 is performed. When the sampling voltage V1 at the back end of the pre-charging relay is lower than the preset voltage, repeat this step S2.1 until the sampling voltage V1 at the back end of the pre-charging relay is not less than the preset voltage.

It is worth noting that, in this embodiment, the preset voltage is set to 30V, which can be modified according to actual measurement and is not unique. If the back-end sampling voltage V1 of the pre-charging relay is less than 30V, it can be considered that the connection line of the back-end voltage sampling point of the pre-charging relay is not tightly connected or not connected, and it is not convenient to proceed to the next step S2.2, so The next step S2.2 can only be performed after the sampling voltage V1 at the back end of the pre-charging relay is not less than 30V.

Step S2.2: Use measuring devices such as Hall current sensors or shunts to sample and obtain the loop current in the bus cluster determined in step S1.4, as the judgment basis in the next step S2.3, and perform judgment processing .

At the same time, high-voltage sampling points can also be set at the front and rear ends of the relay to be tested in the bus cluster, and the sampling voltages at the front and rear ends of the relay to be tested can be obtained, which can also be used as the judgment basis in the next step S2.3 for judgment processing.

Step S2.3: Compare the loop current obtained in step S2.2 with the preset first current value, or determine the back-end voltage and front-end voltage of the relay to be tested according to the sampling voltage at the front and rear ends of the relay to be tested. The ratio between the voltages, and compare the ratio with the preset voltage ratio. Finally, according to the comparison result, the state of the relay to be tested in the bus cluster is judged.

In this embodiment, the preset first current value can be set according to the accuracy difference of the selected measuring instrument such as a current sensor, and here the preset first current value is set to 5A. At the same time, the preset voltage ratio can be set according to the total voltage detection accuracy of the multi-cluster battery system. Here, the preset voltage ratio is set to 90%.

Referring to Figure 3, it can be seen from Figure 3 that the back-end sampling voltage V1 of the pre-charge relay and the back-end sampling voltage V3 at the total positive relay are equipotential potentials, and the front-end sampling voltage V2 of the pre-charge relay and the front-end sampling voltage at the total positive relay The voltage V4 is an equipotential potential. Similarly, the back-end sampling voltage V5 of the total negative relay and the back-end sampling voltage V3 at the total positive relay are equipotential potentials, and the front-end sampling voltage V6 of the total negative relay and the front-end sampling voltage V4 at the total positive relay are equipotential potentials. Since in this embodiment, it is necessary to obtain the ratio between the back-end voltage and the front-end voltage of the relay to be tested, it is necessary to calculate the ratio of the back-end sampling voltage V1 of the pre-charging relay to the front-end sampling voltage V2 of the pre-charging relay, or the total The rear sampling voltage V3 of the positive relay accounts for the front sampling voltage V4 of the total positive relay, or the rear sampling voltage V5 of the total negative relay accounts for the front sampling voltage V6 of the total negative relay.

Specifically, one of the above three ratios is selected, as long as any one of them is not less than 90% of the preset voltage ratio, or the current value measured by the current sensor is greater than the preset first current value of 5A, All of them indicate that the relays in the busbar cluster are in a sticky state, the multi-cluster battery system cannot be powered on, and an alarm needs to be sent to notify the maintenance personnel to check. On the contrary, the relays to be tested in the bus cluster are not in the sticking state, and the relays to be tested in the bus cluster are all in a normal state.

Step S3: According to the non-stick state of the relays to be tested in the bus cluster determined in step S2.3, it can be determined that among the remaining battery clusters in the multi-cluster battery system, there must be a cluster of battery clusters that has been connected to the battery cluster in the energy storage system. The inverter PCS is connected, so the loop voltage of the battery cluster is equal to the total voltage of the battery at this time, so the voltage difference between the front and rear ends of the relay cannot be used to detect the relay state. Therefore, the state of the relays in the remaining battery clusters in the multi-cluster battery system is detected by the loop current value, as follows:

Step S3.1: Referring to Figure 1, it can be seen from Figure 1 that the battery clusters are distributed side by side, so when detecting the state of the relays in the remaining battery clusters, it is not necessary to be the same as the bus clusters, cluster by cluster Individual assays are performed, which can be assayed simultaneously. In this embodiment, the circuits of the remaining battery clusters in the multi-cluster battery system are disconnected, and at the same time, the current value of the disconnected battery cluster circuits is obtained by measuring the current sensor.

Step S3.2: Compare the current value of the disconnected battery cluster circuit obtained in step S3.1 with the preset second current value, when the current value of the disconnected battery cluster circuit is greater than the preset second current value, the relays in the battery cluster corresponding to the current value greater than the preset second current value are in the sticking state, otherwise, the relays in the remaining battery clusters are not in the sticking state.

Specifically, the preset second current value can be set according to the accuracy difference of the current sensors. In this embodiment, the preset second current value is set to 5A. That is to say, when the current value of the disconnected battery cluster loop is greater than 5A, it means that the relay in the battery cluster is in a sticking state, and the stack control management unit BSU needs to be notified, and the stack control management unit BSU will issue the Electric command, power off the battery cluster that has been powered on, and send the relay adhesion fault to the energy management system EMS at the same time, and the energy management system EMS cuts off the inverter PCS in the energy storage system to ensure no current output to prevent There is a risk of overcharging and overdischarging. Otherwise, the relays in the remaining battery clusters have no sticking state.

Therefore, the relay adhesion detection method for a multi-cluster battery system proposed in the embodiment of the present invention can directly use the equipment in the existing high-voltage box to divide all battery clusters without using a DC high-voltage relay with auxiliary contacts. Finally, the divided battery clusters are detected respectively through the voltage difference between the front and rear ends of the relay or the loop current value, and then the adhesion state of the relay can be accurately detected in the multi-cluster battery system, reducing the operation risk of the multi-cluster battery system and avoiding the multi-cluster battery system. The battery system is overcharged and overdischarged.

Example 2

An embodiment of the present invention proposes a relay adhesion detection device for a multi-cluster battery system, the detection device includes a clustering module, a first detection module and a second detection module, wherein the clustering module, the first detection module and the second detection module Information exchange between modules. Specifically as follows:

The clustering module is used to determine the busbar clusters in the multi-cluster battery system. Specifically, in the clustering module, after obtaining the circuit voltage corresponding to each cluster of battery clusters through sampling, by deleting the battery cluster whose high-voltage relay status is disconnected, and then selecting the minimum circuit voltage, the battery corresponding to the minimum circuit voltage A cluster is a bus cluster.

Specifically, in the clustering module, many battery clusters in the multi-cluster battery system will be divided into busbar clusters and remaining battery clusters, and the clustering module will send the clustering results to the first detection module and the second detection module In the module, the bus cluster is detected by the first detection module alone, and the remaining battery cluster is detected by the second detection module.

The first detection module is used to receive the bus cluster information sent by the clustering module, and detect the status of the relays in the bus cluster according to the voltage difference between the front and rear ends of the relay or the loop current value, and send the detection result to the second detection In the module, it is convenient for the operation of the second detection module. In this embodiment, the detection can be carried out in two ways: the voltage difference between the front and rear ends of the relay or the loop current value.

Here, the loop current value is taken as an example for explanation. Specifically, the loop current value in the bus cluster is sampled and obtained through measuring devices such as Hall current sensors or shunts, and the obtained loop current is compared with the preset first current value for comparison. When the current value measured by the current sensor is greater than the preset first current value, it means that the relays in the bus cluster are in a sticking state, and the first detection module issues an early warning, and the first detection module sends the detection result to the first In the second detection module. On the contrary, all the relays to be tested in the bus cluster are in a normal state, and the first detection module will also send the detection results to the second detection module. It should be noted that the preset first current value here can be set according to the accuracy difference of the selected measuring instrument such as the current sensor, and it is not unique.

Here, the voltage difference between the front and rear ends of the relay is taken as an example to explain. Specifically, high-voltage sampling points are set at the front and rear ends of the relay to be tested in the bus cluster, and the sampling voltage of the front and rear ends of the relay to be tested is obtained, and the relay to be tested is The ratio between the back-end voltage and the front-end voltage is compared with the preset voltage ratio. When the ratio between the back-end voltage and the front-end voltage of the relay to be tested is not less than the ratio of the preset voltage, it means that the relays in the bus cluster are in a sticking state, and the first detection module issues an early warning, and the first detection module Send the detection result to the second detection module. On the contrary, all the relays to be tested in the bus cluster are in a normal state, and the first detection module will also send the detection results to the second detection module. It is worth noting that the preset voltage ratio can be set according to the total voltage detection accuracy of the multi-cluster battery system, which is not unique.

The second detection module is used for receiving the detection result signal sent by the first detection module, and judging its specific operation status according to the detection result signal. In this embodiment, there are two kinds of detection results of the first detection module, one detection result is "the bus cluster has an adhesion state", and the other detection result is "the bus cluster does not have an adhesion state". The detection results will all be sent to the second detection module, but when the second detection module receives the detection result signal that "the bus cluster does not have an adhesion state", the second detection module will not work, otherwise, when When the second detection module receives "the bus cluster has a conglutination state", the second detection module will detect the status of the remaining battery clusters.

Specifically, the second detection module is used to detect the state of the relays in the remaining battery clusters in the multi-cluster battery system except the bus cluster according to the loop current value. In this embodiment, when the first detection module does not detect the adhesion of the bus clusters, it is necessary to check the remaining battery clusters. Therefore, the loop current of the remaining battery clusters is sampled and obtained by measuring devices such as current sensors or shunts, and the loop current is compared with the preset second current value. It should be noted that the preset second current value can be set according to the accuracy difference of the current sensor, and it is not unique. Wherein when the loop current is greater than the preset second current value, the relays in the remaining battery clusters are in a sticking state, and the second detection module issues an early warning. Otherwise, the relays in the remaining battery clusters have no sticking state.

The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, any person familiar with the technical field within the technical scope disclosed in the present invention, according to the technical solution of the present invention Any equivalent replacement or change of the inventive concepts thereof shall fall within the protection scope of the present invention.

Claims (9)

1. A relay adhesion detection method for a multi-cluster battery system, characterized in that, the adhesion detection method is as follows: Determine the busbar clusters in the multi-cluster battery system according to the working status of the multi-cluster battery system; Detecting the adhesion state of the relays in the bus cluster; The sticking state of the relays in the remaining battery clusters in the multi-cluster battery system is detected by the loop current value; Determine the busbar clusters in the multi-cluster battery system, as follows: initializing the multi-cluster battery system; Sampling and acquiring the voltage of each battery cluster in the multi-cluster battery system; Detect the state of the high-voltage relay of each battery cluster, and determine all the battery clusters in the state of the high-voltage relay without interruption; From the sampling voltages corresponding to all the battery clusters in the uninterrupted high voltage relay state, determine the battery cluster in the uninterrupted high voltage relay state corresponding to the minimum sampling voltage, and the battery cluster in the uninterrupted high voltage relay state corresponding to the minimum sampling voltage is a bus cluster . 2. The relay adhesion detection method for a multi-cluster battery system according to claim 1, characterized in that the relays in the busbar clusters are detected by the voltage difference between the front and rear ends of the relays, specifically as follows: Sampling and obtaining the voltage of the relay to be tested in the bus cluster, and comparing the voltage with a preset voltage, and when the voltage is not less than the preset voltage, then perform the next step, otherwise, repeat this step; Obtain the proportion of the rear-end voltage and the front-end voltage of the relay to be tested according to the front-end and rear-end sampling voltages of the relay to be tested, and compare the proportion with the preset voltage proportion, and judge the bus according to the comparison result The status of the relays under test in the cluster. 3. The relay adhesion detection method for a multi-cluster battery system according to claim 2, characterized in that the relays in the bus cluster are detected by the loop current value, specifically as follows: Obtain the loop current of the bus cluster, and simultaneously set high-voltage sampling points at the front and rear ends of the relay to be tested in the bus cluster, and obtain the sampling voltages at the front and rear ends of the relay to be tested; Comparing the loop current of the bus cluster with a preset first current value, and judging the state of the relay to be tested in the bus cluster according to the comparison result. 4. The relay adhesion detection method for a multi-cluster battery system according to claim 3, wherein the state of the relay to be tested in the bus cluster is judged as follows: When the rear-end voltage ratio of the relay to be tested is not less than the preset voltage ratio, or the loop current of the bus cluster is greater than the preset first current value, the relays in the bus cluster are stuck state, otherwise, the relay to be tested is not in a sticking state. 5. The method for detecting relay adhesion of a multi-cluster battery system according to claim 3, wherein the relays in the remaining battery clusters in the multi-cluster battery system are detected by the loop current value, specifically as follows: Disconnecting the remaining battery cluster circuits, and obtaining the current value of the disconnected battery cluster circuits; Comparing the current value of the disconnected battery cluster loop with a preset second current value, when the current value is greater than the preset second current value, the relay in the battery cluster corresponding to the current value If it is in the sticking state, otherwise, it will return that the relay in the battery cluster corresponding to the current value is not in the sticking state. 6. The relay adhesion detection method for a multi-cluster battery system according to claim 5, wherein the preset voltage ratio is set according to the total voltage detection accuracy of the multi-cluster battery system; Both the preset first current value and the preset second current value are set according to the accuracy difference of the current sensors. 7. A relay adhesion detection device for a multi-cluster battery system using the relay adhesion detection method for a multi-cluster battery system according to claim 1, wherein the detection device comprises: The clustering module is used to determine the busbar clusters in the multi-cluster battery system; The first detection module is used to detect the state of the relays in the bus cluster according to the voltage difference between the front and rear ends of the relay or the loop current value; The second detection module is used to detect the states of the relays in the remaining battery clusters in the multi-cluster battery system except the bus cluster according to the loop current value. 8. A storage medium, wherein a computer program is stored in the storage medium, and the computer program is configured to execute the method described in any one of claims 1 to 6 when running. 9. An electronic device comprising a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to run the computer program to perform any one of claims 1 to 6 method described in .

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