Energy storage battery system and its protection and control method

Abstract

The present invention discloses an energy storage battery system and its protection control method, which continuously obtains the current fault information of the target battery cluster, and the fault information includes warning parameters for starting protection; it is judged that the warning parameters indicate a single battery fault, and when it reaches the threshold and occurs for more than a preset duration, a warning is triggered by the battery management system BMS; when the warning occurs, a single-cluster cut-out protection action is performed on a single battery of the target battery cluster; when the BMS detects that each battery has completed the single-cluster protection action, the alarm is cleared. Through the above improvement of the BMS control protection strategy, while meeting the single-in and single-out requirements, by distinguishing system risks and single-cell risks; if it is a system risk, it is directly protected by the PCS to ensure safety; if it is a single-cell risk, for a certain cluster or single cell, it is directly protected by the BMS, so as to avoid meeting the single-in and single-out requirements while controlling system risks and ensuring safe and reliable operation.

Description

Technical Field

[0001] The present invention relates to the field of energy storage batteries, and particularly to an energy storage battery system and a protection control method thereof. Background Art

[0002] Energy storage batteries are currently an indispensable energy storage medium for clothing, food, housing, and transportation. For example, the most widely used lithium battery system or lead-acid battery system can be used as a power battery or a communication backup power supply according to different application requirements.

[0003] For the start and stop of a lithium battery system or a lead-acid battery system, the entire battery system usually enters and exits the power supply mode, and an inverter PCS or a battery management system BMS is used to ensure reliable operation.

[0004] However, when the inverter PCS or the battery management system BMS activates the protection mechanism, all battery clusters under at least one inverter will stop working, which is actually not conducive to continuous and reliable operation in this case. Summary of the Invention

[0005] The purpose of the present invention is to provide an energy storage battery system and a protection control method thereof, so as to achieve the technical advantages of meeting single-in and single-out while controlling system risks and ensuring safe and reliable operation.

[0006] To achieve the above purpose, the present invention discloses the following technical solutions:

[0007] An energy storage battery protection control method includes:

[0008] Continuously obtain the fault information of the current target battery cluster, where the fault information includes warning parameters for starting protection;

[0009] Judge that the warning parameters indicate a single battery fault, and reach the threshold and occur for more than a preset duration, and trigger a warning through the battery management system BMS;

[0010] When a warning occurs, perform a single-cluster cut-out protection action on a single battery of the target battery cluster;

[0011] When the BMS detects that each battery has completed the single-cluster protection action, clear the alarm.

[0012] Preferably, judge that the warning parameters indicate a system fault, and reach the threshold and occur for more than a preset duration, and trigger a warning through the battery management system BMS;

[0013] When a warning occurs, perform a protection action on all batteries of the target battery cluster;

[0014] When the BMS detects that all batteries have completed the protection action, clear the alarm.

[0015] Preferably, when a warning occurs, after performing a single-cluster cut-out protection action on a single battery of the target battery cluster, the method further includes:

[0016] If the single-cluster cut-out for a single battery of the target battery cluster fails and the cut-out failure signal persists for a preset duration, the BMS triggers an alarm for contactor or processor failure.

[0017] Preferably, the method further includes:

[0018] Before the BMS detects that each battery has completed the single-cluster protection action, it determines whether the time when the BMS initiates protection exceeds a preset time, and at this time, checks the information of the inverter PCS through a dry contact.

[0019] Initiate trip management for all batteries.

[0020] Preferably, initiating trip management for all batteries further includes:

[0021] The BMS initiates self-protection.

[0022] Preferably, when the BMS triggers a warning for all batteries of a target single battery or a target battery cluster, it sends a warning signal to the Safety Management System (SMS) through the bus and records it.

[0023] An energy storage device incorporates the above energy storage battery protection control method.

[0024] A computing device incorporates the above energy storage battery protection control method.

[0025] An energy storage container is configured with the above energy storage device and applies the above energy storage battery protection control method.

[0026] The technical effect of the present invention is as follows: By determining that the warning parameter indicates a single battery failure, the Battery Management System (BMS) triggers a warning; when a warning occurs, a single-cluster cut-out protection action is performed on a single battery of the target battery cluster; when the BMS detects that each battery has completed the single-cluster protection action, the alarm is cleared. Through the above improvement of the BMS control protection strategy, while meeting the requirements of single-in single-out, by distinguishing system risks and single-cell risks; if it is a system risk, it is directly protected by the PCS to ensure safety; if it is a single-cell risk, for a certain cluster or single cell, it is directly protected by the BMS, thereby avoiding meeting the requirements of single-in single-out while controlling system risks and ensuring safe and reliable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a flowchart of the protection control method for the energy storage battery system according to an embodiment of the present invention;

[0028] Figure 2Flow chart of the protection control method for the energy storage battery system according to another embodiment of the present invention;

[0029] Figure 3 Flow chart of the protection control method for the energy storage battery system according to another embodiment of the present invention;

[0030] Figure 4 Flow chart of the protection control method for the energy storage battery system according to an embodiment of the present invention

[0031] Figure 5 Schematic structural diagram of the energy storage device according to an embodiment of the present invention;

[0032] Figure 6 Schematic structural diagram of the computing device according to an embodiment of the present invention;

[0033] Figure 7 Schematic structural diagram of the energy storage container according to an embodiment of the present invention. Detailed implementation manners

[0034] The detailed implementation manners of the present invention relate to an energy storage battery system and a protection control method thereof, so as to achieve the technical advantages of meeting single-in and single-out while controlling system risks and ensuring safe and reliable operation.

[0035] In the prior art, the traditional energy storage lithium battery system is configured with multiple clusters of lithium battery clusters. Under the current control mechanism, in case of a fault, they all operate in a group-in and group-out manner. The main reason is that: for existing lead-acid batteries, if the voltage of a single cell drops to 0V or even reverses, it will not cause too much safety problem. More specifically, especially for the application scenario of power batteries, since it operates in a single cluster, there is no need to consider single-in and single-out or in and out together. For the lithium battery system for large-scale backup applications, multiple clusters are used in parallel, mainly in the standby state, and start discharging occasionally during power outages, and the discharge rate is relatively high, generally adopting the in and out together scheme. When protection is required, it is mainly executed by the PCS (inverter) protection, and the BMS (battery manager) assists in completing the emergency protection.

[0036] Although the energy storage lithium battery system in the prior art can also support single-in and single-out of a cluster of batteries, when there is a need to protect a single cell in a certain cluster, often the entire battery stack, that is, multiple clusters of batteries will stop operating, that is, the availability and reliability of the energy storage system will be greatly reduced.

[0037] To overcome the above problems:

[0038] As Figure 1 shown, the flow of the protection control method for the energy storage battery system,

[0039] S11: Continuously obtain the fault information of the current target battery cluster, where the fault information includes the warning parameters for starting protection;

[0040] The present invention takes the entity where the fault information occurs as the monitoring entity, and adopts different early warning and fault elimination methods according to different faults during real-time observation.

[0041] S12: Determine that the warning parameter indicates a single battery fault, reaches the threshold and occurs for more than a preset duration, and trigger a warning through the battery management system BMS;

[0042] When a single battery fails, that is, when the single-cell voltage of a certain cluster of batteries is too high or too low, the battery management system BMS is used to warn of the single-cell risk.

[0043] S13: When a warning occurs, perform a single-cluster cut-out protection action on the single battery of the target battery cluster;

[0044] When determining the single-cell risk, a single-cluster cut-out protection action is completed for the single battery, that is, a strategy of continuing to operate for other batteries without fault information.

[0045] S14: When the BMS detects that each battery has completed the single-cluster protection action, clear the alarm.

[0046] The present invention aims at the situation where a single battery cell in a cluster needs to be protected, improves the drawback that the entire battery stack (multiple clusters) stops operating in the prior art, and greatly improves the reliability and availability of the energy storage system.

[0047] Such as Figure 2 shown, determine that the warning parameter indicates a system fault, reaches the threshold and occurs for more than a preset duration, and trigger a warning through the battery management system BMS;

[0048] S21: When a warning occurs, perform a protection action on all the batteries of the target battery cluster;

[0049] S22: When the BMS detects that all the batteries have completed the protection action, clear the alarm.

[0050] In the present invention, by accurately distinguishing between system faults or single-cell risks, a risk elimination mechanism combining all-in-all-out and single-in-single-out is adopted. That is, for systematic risks, for the system, it is directly protected by the PCS, such as faults such as too high or too low total voltage, too high or too low current, etc.

[0051] Refer to Figure 3 , after step S13, when a warning occurs and a single-cluster cut-out protection action is performed on the single battery of the target battery cluster, it further includes:

[0052] S31: If the single-cluster cut-out of the single battery of the target battery cluster fails and the cut-out failure signal lasts for a preset duration, the BMS triggers an alarm for contactor or processor failure.

[0053] In this embodiment, when the single-cluster cut-out operation needs to be refined, since it is not caused by the failure of a single battery in the target battery cluster, when the cut-out is not completed, it can be determined that there is a failure in the contactor or the processor. After the BMS triggers an alarm, a protection action will be triggered, and the BAU will trip to complete the protection.

[0054] And,

[0055] Before S14, when the BMS detects that all batteries have not completed the single-cluster protection action:

[0056] S32: Determine whether the time when the BMS triggers protection exceeds the preset time, and at this time, check the information of the inverter PCS through the dry contact.

[0057] In this step, actually when troubleshooting a single battery in the target battery cluster and a cut-out failure occurs to confirm other system-level failures, it is triggered by a dry contact signal. For example, after 3 seconds, at this time, regardless of whether the PCS operates or not, the BAU trips to protect all clusters under management.

[0058] S33: Start the trip management for all batteries.

[0059] Reference Figure 4 After S32, starting the trip management for all batteries further includes:

[0060] S41: The BMS starts self-protection;

[0061] S42: When the BMS triggers a warning for a target single battery or all batteries in the target battery cluster, send a warning signal to the safety management system SMS through the bus and record it.

[0062] Similarly, when the BMS triggers the recovery threshold through the warning method and after the recovery threshold lasts for 5 seconds, the BMS eliminates the alarm, and obtains the alarm record through the input and output ports of the SMS and generates a warning control event.

[0063] Reference Figure 5 An energy storage device incorporates the above energy storage battery protection control method.

[0064] It should be noted that the energy storage device of the present invention is particularly suitable for a lithium battery system for large-scale backup applications to Figures 1-4 illustrate the energy storage battery protection control method and its corresponding description.

[0065] Reference Figure 6 A computing device incorporates the above energy storage battery protection control method.

[0066] The computing device may be a control module that embeds a control method for an energy storage battery fire protection system, such as at least one processor of a fire controller; and

[0067] a memory communicatively connected to the at least one processor; wherein,

[0068] the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the control method of the energy storage battery fire protection system.

[0069] Reference Figure 7 , an energy storage container configured with the energy storage device described in claim 8, and, applying Figures 1-4 the energy storage battery protection control method illustrated and described accordingly.

[0070] In summary:

[0071] For the energy storage battery system and its protection control method of the present invention, it is used to judge that the warning parameter indicates a single battery failure, and trigger a warning through the battery management system BMS; when a warning occurs, a single-cluster cut-out protection action is performed on a single battery of the target battery cluster; when the BMS detects that each battery has completed the single-cluster protection action, the alarm is cleared. Through the above improvement of the BMS control protection strategy, while meeting the single-in and single-out requirements, by distinguishing system risks and single-cell risks; if it is a system risk, it is directly protected by the PCS to ensure safety; if it is a single-cell risk, for a certain cluster or single cell, it is directly protected by the BMS, so as to avoid meeting the single-in and single-out requirements, control system risks, and ensure safe and reliable operation.

[0072] It should be understood that the embodiments disclosed in the present invention are not limited to the specific structures and processing steps disclosed herein, but should extend to equivalent alternatives of these features understood by those of ordinary skill in the relevant art. It should also be understood that the terms used herein are only for the purpose of describing specific embodiments and do not mean to limit.

[0073] The phrase "an embodiment" or "embodiments" mentioned in the specification means that the specific features, structures or characteristics described in connection with the embodiments are included in at least one embodiment of the present invention. Therefore, the phrases "an embodiment" or "embodiments" that appear throughout the specification do not necessarily all refer to the same embodiment.

[0074] Although the embodiments disclosed in the present invention are as above, the content is only an embodiment adopted for the convenience of understanding the present invention and is not intended to limit the present invention. Any person skilled in the art within the technical field to which the present invention pertains may make any modifications and changes in the form of implementation and details without departing from the spirit and scope disclosed in the present invention. However, the scope of patent protection of the present invention shall still be subject to the scope defined by the appended claims.

Claims

1. A method for protecting and controlling an energy storage battery, characterized in that, Including: Continuously obtain the current fault information of the target battery cluster, where the fault information includes warning parameters for starting protection; Judge that the warning parameters indicate a single battery fault, and when it reaches the threshold and occurs for more than a preset duration, trigger a warning through the battery management system BMS; When a warning occurs, perform a single-cluster cut-out protection action on a single battery of the target battery cluster; When the BMS detects that each battery has completed the single-cluster protection action, clear the alarm; It also includes: Judge that the warning parameters indicate a system fault, and when it reaches the threshold and occurs for more than a preset duration, trigger a warning through the battery management system BMS; When a warning occurs, perform a protection action on all the batteries of the target battery cluster; When the BMS detects that all the batteries have completed the protection action, clear the alarm; When a warning occurs, after performing a single-cluster cut-out protection action on a single battery of the target battery cluster, it further includes: If the single-cluster cut-out of a single battery of the target battery cluster fails and the cut-out failure signal lasts for a preset duration, the BMS triggers an alarm for contactor or processor failure; It also includes: Before the BMS detects that each battery has completed the single-cluster protection action, judge whether the time when the BMS triggers the protection exceeds the preset time, and at this time, check the information of the inverter PCS through a dry contact; Start the trip management for all the batteries. After starting the trip management for all the batteries, it further includes:

2. The energy storage battery protection control method according to claim 1, wherein The BMS starts self-protection. When the BMS triggers a warning for all the batteries of the target single battery or the target battery cluster, send a warning signal to the safety management system SMS through the bus and record it.

3. According to the energy storage battery protection control method in claim 1, it is characterized in that Embed the energy storage battery protection control method according to any one of claims 1-3.

4. An energy storage device, characterized in that, Embed the energy storage battery protection control method according to any one of claims 1-3.

5. A computing device, characterized in that, 6. An energy storage container configured with the energy storage device according to claim 4 and applying the energy storage battery protection control method according to any one of claims 1-3. ​

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