Battery cluster management method and system and storage medium

Abstract

The invention provides a battery cluster management method and system and a storage medium, and the method comprises the steps: obtaining the inter-cluster voltage difference of battery clusters, and determining the threshold range of the inter-cluster voltage difference; if the inter-cluster pressure difference is larger than a first threshold value and smaller than a second threshold value, a circulation switch is closed, so that the inter-cluster pressure difference is smaller than the first threshold value; and if the inter-cluster voltage difference is smaller than the first threshold value, a circulation switch is switched off, and a load switch is switched on, so that intra-cluster switching-on is completed. In the technical scheme provided by the embodiment of the invention, the fusion switch is used for replacing a combination of a contactor and a circuit breaker, so that the problem that the contactor is easy to adhere to cause a system fault when a load is cut off due to current overload is avoided, and the system fault rate is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery management, and in particular to a battery cluster management method, system and storage medium. BACKGROUND

[0002] In the related art, a contactor and a circuit breaker are arranged in a traditional high-voltage box. When the current overload causes the load to be cut off, the contactor in the high-voltage box is prone to sticking, thereby causing the system to malfunction and stop running. SUMMARY

[0003] In view of the above problems, the embodiments of the present application provide a battery cluster management method, system and storage medium to solve the problem that the contactor is prone to sticking in the prior art, causing the system to malfunction and stop running.

[0004] In a first aspect, the embodiments of the present application provide a battery cluster management method, which comprises:

[0005] obtaining an inter-cluster pressure difference of a battery cluster, and determining a threshold range in which the inter-cluster pressure difference is located;

[0006] if the inter-cluster pressure difference is greater than a first threshold value and less than a second threshold value, closing a circulating current switch to make the inter-cluster pressure difference less than the first threshold value;

[0007] if the inter-cluster pressure difference is less than the first threshold value, opening the circulating current switch and closing a load switch to complete cluster internal closing.

[0008] In a possible implementation, the method further comprises:

[0009] if the inter-cluster pressure difference is greater than the second threshold value, generating a fault information.

[0010] In a second aspect, the embodiments of the present application provide a battery cluster management system, which comprises a battery management system (BMS);

[0011] The BMS is configured to obtain an inter-cluster pressure difference of a battery cluster, and determine a threshold range in which the inter-cluster pressure difference is located; if the inter-cluster pressure difference is greater than a first threshold value and less than a second threshold value, close a circulating current switch to make the inter-cluster pressure difference less than the first threshold value; and if the inter-cluster pressure difference is less than the first threshold value, open the circulating current switch and close a load switch to complete cluster internal closing.

[0012] In a possible implementation, the system further comprises a fusion unit, and the fusion unit comprises a circulating current switch, a load switch and a protection resistor;

[0013] The circulating current switch is configured to control the protection resistor to realize pre-charging or circulating current.

[0014] The load switch is used to control the conduction or turn-off of the charging and discharging circuit in which the battery cluster is located.

[0015] The protection resistor is used to limit the impact current when the system is powered on; through the ring current electric heating conversion, the output voltage of the high-voltage battery in the battery cluster is reduced to reduce the inter-cluster voltage difference.

[0016] In a possible implementation, the fusion unit includes a first fusion switch unit and a second fusion switch unit.

[0017] The first fusion switch unit includes a first ring current switch, a second ring current switch, a first load switch, a second load switch, and a first protection resistor.

[0018] The second fusion switch unit includes a third ring current switch, a fourth ring current switch, a third load switch, a fourth load switch, and a second protection resistor.

[0019] In a possible implementation, the system further includes a first fuse, a first battery cluster, and a first Hall sensor.

[0020] The first fuse is electrically connected to the positive electrode of the first battery cluster through the first load switch, the first protection resistor and the first ring current switch are connected in series with each other and then connected in parallel to both ends of the first load switch, the negative electrode of the first battery cluster is electrically connected to the first Hall sensor through the second load switch, and the second ring current switch is connected in parallel to both ends of the second load switch.

[0021] In a possible implementation, the system further includes a second fuse, a second battery cluster, and a second Hall sensor.

[0022] The second fuse is electrically connected to the positive electrode of the second battery cluster through the third load switch, the second protection resistor and the third ring current switch are connected in series with each other and then connected in parallel to both ends of the third load switch, the negative electrode of the second battery cluster is electrically connected to the second Hall sensor through the fourth load switch, and the fourth ring current switch is connected in parallel to both ends of the fourth load switch.

[0023] In a possible implementation, the BMS includes a first BMS, which is used to acquire the inter-cluster voltage difference of the first battery cluster; when the inter-cluster voltage difference is greater than a first threshold value and less than a second threshold value, the first ring current switch and the second ring current switch are closed, and the first load switch and the second load switch are opened, so that the inter-cluster voltage difference of the first battery cluster is less than the first threshold value; when the inter-cluster voltage difference is less than the first threshold value, the first ring current switch and the second ring current switch are opened, and the first load switch and the second load switch are closed, to complete the inter-cluster closing of the first battery cluster.

[0024] In a possible implementation, the BMS comprises a second BMS configured to acquire an inter-cluster voltage difference of the second battery cluster; when the inter-cluster voltage difference is greater than a first threshold value and less than a second threshold value, the third loop current switch and the fourth loop current switch are closed, and the third load switch and the fourth load switch are opened, so that the inter-cluster voltage difference of the second battery cluster is less than the first threshold value; when the inter-cluster voltage difference is less than the first threshold value, the third loop current switch and the fourth loop current switch are opened, and the third load switch and the fourth load switch are closed, so as to complete the intra-cluster closing of the second battery cluster.

[0025] In a third aspect, an embodiment of the present application provides a computer readable storage medium, which comprises a stored program, wherein the program controls a device where the computer readable storage medium is located to perform the battery cluster management method in the first aspect or any possible implementation manner of the first aspect when the program is running.

[0026] In the technical solution provided by the embodiment of the present application, the combination of the contactor and the circuit breaker is replaced by the fusion switch, so that the problem that the contactor is easy to stick and cause system failure when the load is cut off due to current overload is avoided, and the system failure rate is reduced.

[0027] In the embodiment of the present application, one high-voltage box is used to control multiple battery clusters, which is conducive to reducing cost and improving battery cluster management efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 A flowchart of a battery cluster management method provided by the embodiment of the present application is shown in FIG. 1.

[0029] Figure 2 A schematic diagram of a battery cluster management system provided by the embodiment of the present application is shown in FIG. 2. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the present application clearer and more comprehensible, the present application is further described below in combination with the drawings and specific embodiments. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0031] Figure 1 A flowchart of a battery cluster management method provided by the embodiment of the present application is shown in FIG. 1. Figure 1 As shown in FIG. 1, the method comprises the following steps.

[0032] Step 101, obtain the inter-cluster voltage difference of the battery cluster, and determine the threshold range in which the inter-cluster voltage difference is located. If the inter-cluster voltage difference is greater than the first threshold value and less than the second threshold value, step 102 is performed; if the inter-cluster voltage difference is less than the first threshold value, step 103 is performed; and if the inter-cluster voltage difference is greater than the second threshold value, step 104 is performed.

[0033] In the embodiment of the present application, each step is executed by a battery management system (BMS). The BMS collects voltage information and current information of each single battery in the battery cluster, and performs aggregation, and calculates the voltage difference between the maximum voltage single battery and the minimum voltage single battery in the battery cluster, that is, the inter-cluster voltage difference of the battery cluster.

[0034] In this step, the first threshold value and the second threshold value can be set based on actual needs. For example, the first threshold value is 10V, and the second threshold value is 20V.

[0035] Step 102, close the circulating current switch to make the inter-cluster voltage difference less than the first threshold value.

[0036] Step 103, open the circulating current switch and close the load switch to complete the intra-cluster closing.

[0037] Step 104, generate fault information.

[0038] In this step, when the inter-cluster voltage difference is greater than the second threshold value, it indicates that the system has a fault, and at this time, the fault information is generated, and the maintenance personnel troubleshoots the battery cluster with the inter-cluster voltage difference greater than the second threshold value based on the fault information.

[0039] In the technical scheme provided by the embodiment of the present application, the circulating current switch and the load switch are used to form a fusion switch, instead of the combination of the contactor and the circuit breaker, which avoids the problem that the contactor is easy to stick and cause the energy storage system to fail when the load is cut off due to current overload, and reduces the system failure rate.

[0040] Figure 2 A schematic diagram of a battery management system provided by the embodiment of the present application is shown in FIG. 1. Figure 2 As shown in FIG. 1, the battery cluster management system includes a BMS, which is used to obtain the inter-cluster voltage difference of the battery cluster and determine the threshold range in which the inter-cluster voltage difference is located. If the inter-cluster voltage difference is greater than the first threshold value and less than the second threshold value, the circulating current switch is closed to make the inter-cluster voltage difference less than the first threshold value. If the inter-cluster voltage difference is less than the first threshold value, the circulating current switch is opened and the load switch is closed to complete the intra-cluster closing.

[0041] In the embodiment of the present application, the system further comprises a fusion unit, the fusion unit comprising a circulating current switch, a load switch and a protection resistor. The circulating current switch is used to control the protection resistor to realize pre-charging or circulating current; the load switch is used to control the on or off of the charging and discharging circuit in which the battery cluster is located; and the protection resistor is used to limit the impact current when the system is powered on. Through circulating current and heat conversion, the output voltage of the high-voltage battery in the battery cluster is reduced to reduce the inter-cluster voltage difference.

[0042] In the related art, when the inter-cluster voltage difference of the battery cluster is large, energy balancing is performed through the contactor, and at this time, the contactor needs to passively withstand a large balancing current, and the contactor may be stuck due to high temperature. In the embodiment of the present application, the protection resistor hinders the flow of current, so that heat is generated when the current passes through the protection resistor, and circulating current and heat conversion is realized. The circulating current and heat conversion converts the output voltage of the high-voltage battery in the battery cluster into heat energy, thereby reducing the output voltage of the high-voltage battery. The protection resistor reduces the inter-cluster voltage difference of the battery cluster, thereby avoiding the problem that the contactor is easily stuck and reducing the system failure rate.

[0043] In the embodiment of the present application, the fusion unit comprises a first fusion switch unit and a second fusion switch unit; the first fusion switch unit 1 comprises a first circulating current switch 11, a second circulating current switch 12, a first load switch 13, a second load switch 14 and a first protection resistor 15; and the second fusion switch unit comprises a third circulating current switch 21, a fourth circulating current switch 22, a third load switch 23, a fourth load switch 24 and a second protection resistor 25.

[0044] In the embodiment of the present application, the system further comprises a first fuse 31, a first battery cluster 41 and a first Hall sensor 51. The first fuse 31 is electrically connected to the positive electrode of the first battery cluster 41 through the first load switch 13, the first protection resistor 15 and the first circulating current switch 11 are connected in series with each other and then connected in parallel to both ends of the first load switch 13, the negative electrode of the first battery cluster 41 is electrically connected to the first Hall sensor 51 through the second load switch 14, and the second circulating current switch 12 is connected in parallel to both ends of the second load switch 14.

[0045] In the embodiment of the present application, the system further comprises a second fuse 32, a second battery cluster 42 and a second Hall sensor 52. The second fuse 32 is electrically connected to the positive electrode of the second battery cluster 42 through the third load switch 23, the second protection resistor 25 and the third circulating current switch 21 are connected in series with each other and then connected in parallel to both ends of the third load switch 23, the negative electrode of the second battery cluster 42 is electrically connected to the second Hall sensor 52 through the fourth load switch 24, and the fourth circulating current switch 22 is connected in parallel to both ends of the fourth load switch 24.

[0046] In the embodiment of the present application, the BMS includes a first BMS 61, which is used to obtain the inter-cluster voltage difference of the first battery cluster; when the inter-cluster voltage difference is greater than a first threshold value and less than a second threshold value, the first loop current switch 11 and the second loop current switch 12 are closed, and the first load switch 13 and the second load switch 14 are disconnected, so that the inter-cluster voltage difference of the first battery cluster is less than the first threshold value; when the inter-cluster voltage difference is less than the first threshold value, the first loop current switch 11 and the second loop current switch 12 are disconnected, and the first load switch 13 and the second load switch 14 are closed, so as to complete the intra-cluster closing of the first battery cluster.

[0047] In the embodiment of the present application, the BMS includes a second BMS 62, which is used to obtain the inter-cluster voltage difference of the second battery cluster; when the inter-cluster voltage difference is greater than a first threshold value and less than a second threshold value, the third loop current switch and the fourth loop current switch are closed, and the third load switch and the fourth load switch are disconnected, so that the inter-cluster voltage difference of the second battery cluster is less than the first threshold value; when the inter-cluster voltage difference is less than the first threshold value, the third loop current switch and the fourth loop current switch are disconnected, and the third load switch and the fourth load switch are closed, so as to complete the intra-cluster closing of the second battery cluster.

[0048] In the embodiment of the present application, the first fusion switch unit, the first fuse 31, the first battery cluster 41, the first Hall sensor 51 and the first BMS 61 are taken as a first group of battery cluster management units in the battery cluster management system, and the second fusion switch unit, the second fuse 32, the second battery cluster 42, the second Hall sensor 52 and the second BMS 62 are taken as a second group of battery cluster management units in the battery cluster management system. The control processes of the first group of battery cluster management units and the second group of battery cluster management units are independent of each other. The inter-cluster voltage difference of the first battery cluster 41 and the second battery cluster 42 can be the same or different. Based on this, the control strategies performed by the first BMS 61 and the second BMS 62 can be the same or different.

[0049] At present, the energy density of the energy storage system is higher and higher, the number of clusters in each energy storage battery compartment is greatly increased, and the management demand for the battery cluster is also increased. In actual application, one or more groups of battery cluster management units can be added in the battery cluster management system based on actual demand, so as to realize the control of multiple battery clusters through one high-voltage box, and the different battery cluster management demands can be met by increasing or decreasing the number of battery cluster management units, thereby improving the management efficiency of the battery cluster.

[0050] In the technical scheme provided by the embodiment of the present application, the fusion switch is used instead of the combination of the contactor and the circuit breaker, thereby avoiding the problem that the contactor is easy to stick and cause system failure when the load is cut off due to current overload, and reducing the system failure rate.

[0051] In the embodiment of the present application, a plurality of battery clusters are controlled by one high-voltage box, which is beneficial to reduce cost and improve battery cluster management efficiency.

[0052] The embodiment of the present application provides a computer readable storage medium, which comprises a stored program, wherein when the program is executed, each step of the embodiment of the battery cluster management method is controlled to be executed by a device where the computer readable storage medium is located, and specific description can be referred to the above-mentioned embodiment of the battery cluster management method.

[0053] The above merely provides the preferred embodiment of the present application, but the protection scope of the present application is not limited to this, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A battery cluster management method, characterized in that, The method includes: Obtain the inter-cluster pressure difference of the battery clusters and determine the threshold range of the inter-cluster pressure difference; If the inter-cluster pressure difference is greater than a first threshold and less than a second threshold, then close the circulating current switch to make the inter-cluster pressure difference less than the first threshold. If the inter-cluster voltage difference is less than the first threshold, the circulating current switch is disconnected and the load switch is closed to complete the intra-cluster closing.

2. The method according to claim 1, characterized in that, The method further includes: If the inter-cluster pressure difference is greater than the second threshold, a fault message is generated.

3. A battery cluster management system, characterized in that, The system includes a battery management system (BMS); The BMS is used to acquire the inter-cluster voltage difference of the battery clusters and determine the threshold range of the inter-cluster voltage difference. If the inter-cluster voltage difference is greater than a first threshold and less than a second threshold, the circulating current switch is closed to make the inter-cluster voltage difference less than the first threshold. If the inter-cluster voltage difference is less than the first threshold, the circulating current switch is opened and the load switch is closed to complete the intra-cluster closing.

4. The system according to claim 3, characterized in that, The system also includes a fusion unit, which includes a circulating current switch, a load switch, and a protective resistor. The circulating current switch is used to control the protective resistor to achieve pre-charging or circulating current. The load switch is used to control the on or off of the charging and discharging circuit where the battery cluster is located. The protective resistor is used to limit the inrush current when the system is powered on; through circulating electrothermal conversion, it reduces the output voltage of the high-voltage battery in the battery cluster, thereby reducing the inter-cluster voltage difference.

5. The system according to claim 4, characterized in that, The fusion unit includes a first fusion switch unit and a second fusion switch unit; The first fusion switch unit includes a first circulating current switch, a second circulating current switch, a first load switch, a second load switch, and a first protection resistor; The second fusion switch unit includes a third circulating current switch, a fourth circulating current switch, a third load switch, a fourth load switch, and a second protection resistor.

6. The system according to claim 5, characterized in that, The system also includes a first fuse, a first battery cluster, and a first Hall sensor; The first fuse is electrically connected to the positive terminal of the first battery cluster through the first load switch. The first protective resistor and the first circulating current switch are connected in series and then in parallel to the two ends of the first load switch. The negative terminal of the first battery cluster is electrically connected to the first Hall sensor through the second load switch. The second circulating current switch is connected in parallel to the two ends of the second load switch.

7. The system according to claim 5, characterized in that, The system also includes a second fuse, a second battery cluster, and a second Hall sensor; The second fuse is electrically connected to the positive terminal of the second battery cluster through the third load switch. The second protective resistor and the third circulating current switch are connected in series and then in parallel to the two ends of the third load switch. The negative terminal of the second battery cluster is electrically connected to the second Hall sensor through the fourth load switch. The fourth circulating current switch is connected in parallel to the two ends of the fourth load switch.

8. The system according to claim 5, characterized in that, The BMS includes a first BMS, which is used to acquire the inter-cluster voltage difference of the first battery cluster; when the inter-cluster voltage difference is greater than a first threshold and less than a second threshold, the first circulating current switch and the second circulating current switch are closed, and the first load switch and the second load switch are opened, so that the inter-cluster voltage difference of the first battery cluster is less than the first threshold. When the inter-cluster pressure difference is less than the first threshold, the first circulating current switch and the second circulating current switch are disconnected, and the first load switch and the second load switch are closed to complete the intra-cluster closing of the first battery cluster.

9. The system according to claim 5, characterized in that, The BMS includes a second BMS, which is used to acquire the inter-cluster voltage difference of the second battery cluster. When the inter-cluster voltage difference is greater than a first threshold and less than a second threshold, the third and fourth circulating current switches are closed, and the third and fourth load switches are opened, so that the inter-cluster voltage difference of the second battery cluster is less than the first threshold. When the inter-cluster voltage difference is less than the first threshold, the third and fourth circulating current switches are opened, and the third and fourth load switches are closed, so as to complete the intra-cluster closing of the second battery cluster.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the device on which the computer-readable storage medium resides to perform the battery cluster management method as described in claim 1 or 2.

Images