CN113193633B - Battery cluster access method, device, energy storage power station, equipment and storage medium - Google Patents

Battery cluster access method, device, energy storage power station, equipment and storage medium Download PDF

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Publication number
CN113193633B
CN113193633B CN202110624628.9A CN202110624628A CN113193633B CN 113193633 B CN113193633 B CN 113193633B CN 202110624628 A CN202110624628 A CN 202110624628A CN 113193633 B CN113193633 B CN 113193633B
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China
Prior art keywords
battery cluster
relay
battery
charging
cluster
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Chinese (zh)
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CN113193633A (en
Inventor
尚德华
王嘉兴
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Aopu Shanghai New Energy Co Ltd
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Aopu Shanghai New Energy Co Ltd
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Priority to CN202110624628.9A priority Critical patent/CN113193633B/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
    • H02J7/0014—Circuits for equalisation of charge between batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/00304—Overcurrent protection
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
    • H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention relates to the technical field of energy storage control, in particular to a battery cluster access method, a device, an energy storage power station, equipment and a storage medium, wherein the battery cluster access method comprises the following steps: closing a negative electrode relay and a pre-charging relay of a first battery cluster, wherein the pre-charging relay is arranged between a positive electrode of the first battery cluster and a positive electrode of a main loop, and a pre-charging resistor is connected in series on the pre-charging relay; acquiring the circulating current value of a first battery cluster, and judging whether the circulating current value meets a preset value or not; and if the preset value is met, closing the positive relay, and opening the pre-charging relay. According to the battery cluster access method provided by the embodiment of the invention, each battery cluster is accessed independently, and a set of energy storage converters can be adopted to control a plurality of battery clusters to be electrified; the provision of the precharge circuit prevents excessive circulation. The method provided by the invention can realize parallel circulation control of the battery clusters by combining the power-on and power-off control strategies of the battery clusters simultaneously, and is simple and easy to realize and good in reliability.

Description

Battery cluster access method, device, energy storage power station, equipment and storage medium
Technical Field
The present invention relates to the field of energy storage control technologies, and in particular, to a method and apparatus for accessing a battery cluster, an energy storage power station, a device, and a storage medium.
Background
In a battery container of an energy storage power station, a battery system often needs to be connected with a plurality of battery clusters in parallel and then enters the PCS equipment. However, due to the voltage difference between the battery clusters, circulation problems may exist between clusters when the clusters are directly connected in parallel. With a smaller pressure differential, the circulation is also smaller, and a smaller circulation is an effective way to balance the cluster energy, which is beneficial. When the pressure difference is large, the circulation is large, when the circulation exceeds the allowable overcurrent value of the power device, the power device is possibly damaged, and when the circulation exceeds the normal working multiplying power of the battery, the battery is possibly damaged, and the problems of battery capacity attenuation, bulge, liquid leakage and the like are possibly caused, so that the battery safety is endangered. When the circulation value reaches the short-circuit current, damage to the battery may be directly caused.
The prior art mainly solves the problems by two schemes:
scheme one: one battery cluster is connected with one PCS, so that the problem of circulation caused by the PCS after a plurality of battery clusters are connected in parallel does not exist, but the method has high cost, and is not applicable to a large-scale energy storage battery system with a plurality of battery clusters because one battery cluster is matched with one PCS.
Scheme II: the SOC value of each battery cluster is calculated in real time, and through SOC comparison, when the SOC value difference is too large, each battery cluster system is forbidden to be connected with PCS, and the problem of the mode is that the SOC of each battery cluster, a battery PACK under the battery cluster and a battery monomer under the battery PACK need to be calculated in real time, the whole calculated amount is too large, and the implementation of a battery cluster circulation control strategy cannot be ensured stably.
It can be seen that the prior art does not provide an effective solution to the above problems.
Disclosure of Invention
Based on this, it is necessary to provide a battery cluster access method, device, energy storage power station, equipment and storage medium for the above-mentioned problems.
The embodiment of the invention is realized in such a way that a battery cluster access method comprises the following steps:
closing a negative electrode relay and a pre-charging relay of a first battery cluster, wherein the pre-charging relay is arranged between a positive electrode of the first battery cluster and a positive electrode of a main loop, and a pre-charging resistor is connected in series on the pre-charging relay;
acquiring the circulating current value of a first battery cluster, and judging whether the circulating current value meets a preset value or not;
and if the preset value is met, closing the positive relay, and opening the pre-charging relay.
In one embodiment, the present invention provides a battery cluster access device, including:
the pre-charging module is used for closing the negative relay and the pre-charging relay of the first battery cluster, wherein the pre-charging relay is arranged between the positive electrode of the first battery cluster and the positive electrode of the total loop, and is connected with a pre-charging resistor in series;
the acquisition module is used for acquiring the circulating current value of the first battery cluster and judging whether the circulating current value meets a preset value or not;
and the operation module is used for closing the positive relay and opening the pre-charging relay if the preset value is met.
In one embodiment, the present invention provides an energy storage power station comprising:
n battery clusters which are arranged in parallel, wherein N is a positive integer greater than or equal to 2; and
the battery cluster access device is used for controlling the battery cluster access load.
In one embodiment, the present invention provides a computer device, including a memory and a processor, where the memory stores a computer program, and the computer program when executed by the processor causes the processor to perform the steps of the above-mentioned battery cluster access method.
In one embodiment, the present invention provides a computer readable storage medium, where a computer program is stored on the computer readable storage medium, where the computer program when executed by a processor causes the processor to execute the steps of the above-mentioned battery cluster access method.
According to the battery cluster access method provided by the embodiment of the invention, each battery cluster is accessed independently, and a set of energy storage converters can be adopted to control a plurality of battery clusters to be electrified; the provision of the precharge circuit prevents excessive circulation. The method provided by the invention can realize parallel circulation control of the battery clusters by combining the power-on and power-off control strategies of the battery clusters simultaneously, and is simple and easy to realize and good in reliability.
Drawings
FIG. 1 is a flow chart of a battery cluster access method provided in one embodiment;
FIG. 2 is a flowchart of the steps further included in the method for accessing a battery cluster according to one embodiment;
FIG. 3 is a block diagram of a battery cluster access device in one embodiment;
FIG. 4 is a block diagram of a component unit of an energy storage power station according to one embodiment;
FIG. 5 is a block diagram of the internal architecture of a computer device in one embodiment.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
It will be understood that the terms "first," "second," and the like, as used herein, may be used to describe various elements, but these elements are not limited by these terms unless otherwise specified. These terms are only used to distinguish one element from another element. For example, a first xx script may be referred to as a second xx script, and similarly, a second xx script may be referred to as a first xx script, without departing from the scope of this disclosure.
As shown in fig. 1, in one embodiment, a method for accessing a battery cluster is provided, which specifically includes the following steps:
step S102, closing a negative electrode relay and a pre-charging relay of a first battery cluster, wherein the pre-charging relay is arranged between a positive electrode of the first battery cluster and a positive electrode of a total loop, and a pre-charging resistor is connected in series on the pre-charging relay.
In the embodiment of the present invention, it should be understood that the first battery cluster may be the first battery cluster incorporated into the system or the second battery cluster, which is merely used to describe the implementation of the method of the present invention, and is not limited to what kind of battery cluster is specifically. It should be noted that, in the embodiment of the present invention, a plurality of battery clusters are arranged in parallel, and for each incorporated battery cluster, at least one of the battery clusters executes the battery cluster access method provided by the embodiment of the present invention.
Step S104, obtaining the circulating current value of the first battery cluster, and judging whether the circulating current value meets a preset value.
In the embodiment of the invention, the circulating current value of the first battery cluster can be detected by a Hall sensor, which belongs to non-contact detection. In the embodiment of the invention, after the circulation value of the first battery cluster is smaller than a preset value, the circulation is gradually reduced, and the influence of the circulation of the closed positive relay is smaller.
And S106, if the preset value is met, closing the positive relay, and opening the pre-charging relay.
In the embodiment of the invention, after the positive relay is closed, the pre-charging relay can be opened, and it is noted that the pre-charging relay should be opened no earlier than the positive relay is closed. In the embodiment of the invention, before the pre-charging relay is disconnected, the pre-charging relay is kept on for a preset time. The preset duration here may be achieved by relay extension, e.g. 1S, 500ms, etc.
According to the battery cluster access method provided by the embodiment of the invention, each battery cluster is accessed independently, and a set of energy storage converters can be adopted to control a plurality of battery clusters to be electrified; the provision of the precharge circuit prevents excessive circulation. The method provided by the invention can realize parallel circulation control of the battery clusters by combining the power-on and power-off control strategies of the battery clusters simultaneously, and is simple and easy to realize and good in reliability.
In one embodiment, as shown in fig. 2, step S102, that is, closing the negative relay and the pre-charging relay of the first battery cluster, further includes the following steps:
step S202, obtaining the total voltage value of the battery clusters which are integrated into the total loop and the voltage value of the first battery cluster.
In the embodiment of the present invention, the total voltage value of the battery cluster integrated with the total loop is described by taking 1 PCS (Power Conversion System, energy storage converter) as an example, so the battery cluster integrated with the total loop refers to a battery cluster integrated with the total loop in a PCS, and not a battery cluster integrated with the total loop in the overall system.
Step S204, determining whether the difference between the total voltage value and the voltage value of the first battery cluster meets a preset value.
In the embodiment of the present invention, the preset value of the voltage difference can be set according to the bearing capacity of the system, and the embodiment of the present invention does not specifically limit the magnitude of the preset value of the voltage difference.
Step S206, if the preset value is met, closing the negative electrode relay and the pre-charging relay of the first battery cluster.
In one embodiment, step S102 is to close the negative relay and the pre-charge relay of the first battery cluster, and then further includes the following steps:
after a preset time interval, obtaining a load voltage;
and judging whether the load voltage exceeds a preset value, and if so, completing the pre-charging.
In the embodiment of the present invention, the preset duration of the interval may be set according to the actual situation, which is not particularly limited in the embodiment of the present invention. In the embodiment of the invention, the original preset value can be 90% of the accumulated voltage of the battery.
In one embodiment of the invention, the method further comprises the steps of:
judging whether the first battery cluster is successful in electricity;
if the first battery cluster is successfully electrified, a difference value between the total voltage of the second battery cluster and the total voltage of the first battery cluster is obtained, and if the difference value meets a preset value, the second battery cluster is controlled to be electrified at high voltage;
and if the first battery cluster is not powered on successfully, controlling the second battery cluster to be powered on at high voltage.
In the embodiment of the invention, if the differential pressure is too large, the association is considered unsuitable, the cluster pre-charging is skipped, and if the differential pressure is smaller, the parallel connection condition is met, the second battery cluster is controlled to be electrified at high voltage. And when the first battery cluster is not powered on successfully, the voltage in the system is smaller, and the high-voltage power-on can not be directly started at the moment, so that the problem of pressure difference is not needed to be considered.
In one embodiment of the present invention, the method for controlling the second battery cluster to be powered on at high voltage specifically includes the following steps:
closing a negative electrode relay and a pre-charging relay of the second battery cluster;
acquiring a first battery cluster circulation value and a load voltage;
judging whether the circulating current value and the load voltage meet a preset value or not;
and if the preset value is met, closing the positive relay, and opening the pre-charging relay.
In the embodiment of the present invention, it should be understood that, here, a first battery cluster and a second battery cluster are described as examples, when there are more battery clusters, the first battery cluster is understood to be a plurality of battery clusters (whether the power-up is successful or not) that have already performed the power-up process, and the second battery cluster is understood to be a battery cluster to be powered up in parallel. In the embodiment of the present invention, at the point where the description is needed, any one of the battery clusters may have its negative relay closed uniformly before executing the method, and in the above description, it should be understood that the negative relay of the battery cluster is in a closed state at this time, and the closing time point is not limited, which is determined by the characteristics of the negative relay, but the closing of the pre-charging relay and the positive relay must take into consideration the sequential problem.
The working of the invention is described in the following in a specific example.
As shown, 1 PCS corresponds to 4 battery clusters as an example.
After the system is started, the battery management system obtains a low-voltage power-on instruction, 4 battery clusters respectively perform system self-checking, the system self-checking has no faults, the system self-checking can be in a ready state, the total negative relay of each high-voltage box is attracted, and after the high-voltage power-on instruction is received, the parallel operation of the 4 battery clusters is sequentially performed, and the system self-checking comprises the following specific steps:
1. and controlling the 1 st cluster to carry out high-voltage power-on, closing the pre-charging relay after the 1 st cluster receives the total control high-voltage power-on instruction, detecting whether the load voltage exceeds 90% of the accumulated voltage of the battery after 1s, if so, completing pre-charging, closing the loop total positive relay, and opening the pre-charging relay after 500ms delay.
2. If the high-voltage power-on of the 1 st cluster is successful, the master control detects the difference value between the total voltage of the 2 nd cluster and the total voltage of the 1 st cluster, wherein the difference value is larger than a preset value delta Va, and the fact that the difference value is too large to be suitable for parallel connection is judged, and the pre-charging of the cluster is skipped; if the difference value is smaller than a preset value delta Va, controlling the cluster 2 to carry out high-voltage electrifying, closing a pre-charging relay by a cluster 2 high-voltage box, monitoring pre-charging current (circulation), detecting whether load voltage exceeds 90% of accumulated voltage of a battery after 1s, and if so, closing the cluster 2 high-voltage loop total positive relay, and opening the pre-charging relay after 500ms of delay.
3. If the 1 st cluster fails in high-voltage power-on, the master control directly controls the 2 nd cluster to carry out high-voltage power-on, after the 2 nd cluster receives the master control high-voltage power-on instruction, the pre-charging relay is closed, after 1s, whether the load voltage exceeds 90% of the accumulated voltage of the battery is detected, if yes, the pre-charging is completed, the loop total positive relay is closed, and the pre-charging relay is opened after 500 ms.
4. If the high-voltage power-on of the 1 st cluster or the 2 nd cluster is successful, the total control detects the difference value between the total voltage of the 3 rd cluster and the total voltage of the battery cluster which is successfully powered on, the difference value is larger than delta Va, and the situation that the voltage difference is too large to be suitable for being connected in parallel is judged, and the pre-charging of the cluster is skipped; if the difference value is smaller than delta Va, controlling the 3 rd cluster to carry out high-voltage power-on, closing the pre-charging relay by the 3 rd cluster high-voltage box, monitoring the pre-charging current (circulation) at the same time, and if the current value is smaller than delta Aa, completing pre-charging, closing the 3 rd cluster high-voltage loop total positive relay, and opening the pre-charging relay after 500ms of delay.
5. If the high-voltage power-on of the 1 st cluster and the 2 nd cluster fails, the master control directly controls the 3 rd cluster to carry out the high-voltage power-on, after the 3 rd cluster receives the master control high-voltage power-on instruction, the pre-charging relay is closed, whether the load voltage exceeds 90% of the accumulated voltage of the battery is detected after 1s, if yes, the pre-charging is completed, the loop total positive relay is closed, and the pre-charging relay is opened after 500 ms.
6. If the high-voltage power-on of the 1 st cluster, the 2 nd cluster or the 3 rd cluster is successful, the total control detects the difference value between the total voltage of the 4 th cluster and the total voltage of the battery cluster which is successfully powered on, the difference value is larger than delta Va, the situation that the voltage difference is too large to be suitable for being connected in parallel is judged, and the pre-charge of the cluster is skipped; if the difference value is smaller than delta Va, controlling the 4 th cluster to carry out high-voltage power-on, closing the pre-charging relay by the 4 th cluster high-voltage box, monitoring the pre-charging current (circulation) at the same time, and if the current value is smaller than delta Aa, completing pre-charging, closing the 4 th cluster high-voltage loop total positive relay, and opening the pre-charging relay with a delay of 500 ms.
7. If the high-voltage power-on of the 1 st cluster, the 2 nd cluster and the 3 rd cluster fails, the master control directly controls the 4 th cluster to carry out the high-voltage power-on, after the 4 th cluster receives the high-voltage power-on command of the master control, the pre-charging relay is closed, whether the load voltage exceeds 90% of the accumulated voltage of the battery is detected after 1s, if yes, the pre-charging is completed, the loop total positive relay is closed, and the pre-charging relay is opened after 500 ms.
As shown in fig. 3, in one embodiment, a battery cluster access device is provided, which may specifically include:
the pre-charging module is used for closing the negative relay and the pre-charging relay of the first battery cluster, wherein the pre-charging relay is arranged between the positive electrode of the first battery cluster and the positive electrode of the total loop, and is connected with a pre-charging resistor in series;
the acquisition module is used for acquiring the circulating current value of the first battery cluster and judging whether the circulating current value meets a preset value or not;
and the operation module is used for closing the positive relay and opening the pre-charging relay if the preset value is met.
In the embodiment of the present invention, reference may be made to the description of the method portion of the present invention for specific flow of each step, which is not repeated in the embodiment of the present invention.
The embodiment of the invention also provides an energy storage power station, which comprises:
n battery clusters which are arranged in parallel, wherein N is a positive integer greater than or equal to 2; and
according to the battery cluster access device provided by the embodiment of the invention, the battery cluster access device is used for controlling the battery cluster access load.
In the embodiment of the invention, N battery clusters which are arranged in parallel share one PCS; the battery cluster access device provided by the embodiment of the invention is used for controlling each battery cluster access system, and fig. 4 shows one battery cluster composition unit of the system.
FIG. 5 illustrates an internal block diagram of a computer device in one embodiment. As shown in fig. 5, the computer device includes a processor, a memory, a network interface, an input device, and a display screen connected by a system bus. The memory includes a nonvolatile storage medium and an internal memory. The nonvolatile storage medium of the computer device stores an operating system and may also store a computer program, where the computer program when executed by a processor may cause the processor to implement the battery cluster access method provided by the embodiment of the present invention. The internal memory may also store a computer program, which when executed by the processor, causes the processor to execute the method for accessing a battery cluster according to the embodiments of the present invention. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, the input device of the computer equipment can be a touch layer covered on the display screen, can also be keys, a track ball or a touch pad arranged on the shell of the computer equipment, and can also be an external keyboard, a touch pad or a mouse and the like.
It will be appreciated by those skilled in the art that the structure shown in FIG. 5 is merely a block diagram of some of the structures associated with the present inventive arrangements and is not limiting of the computer device to which the present inventive arrangements may be applied, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.
In one embodiment, the battery cluster access device provided in the embodiment of the present invention may be implemented in the form of a computer program, and the computer program may run on a computer device as shown in fig. 5. The memory of the computer device may store various program modules constituting the battery cluster access device, such as the precharge module, the acquisition module, and the operation module shown in fig. 3. The computer program constituted by the respective program modules causes the processor to execute the steps in the battery cluster access method of the respective embodiments of the present invention described in the present specification.
For example, the computer apparatus shown in fig. 5 may perform step S102 through a pre-charging module in the battery cluster access device shown in fig. 3; the computer device may execute step S104 through the acquisition module; the computer device may execute step S106 through the operation module.
In one embodiment, a computer device is presented, the computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the following steps when executing the computer program:
closing a negative electrode relay and a pre-charging relay of a first battery cluster, wherein the pre-charging relay is arranged between a positive electrode of the first battery cluster and a positive electrode of a main loop, and a pre-charging resistor is connected in series on the pre-charging relay;
acquiring the circulating current value of a first battery cluster, and judging whether the circulating current value meets a preset value or not;
and if the preset value is met, closing the positive relay, and opening the pre-charging relay.
In one embodiment, a computer readable storage medium is provided, having a computer program stored thereon, which when executed by a processor causes the processor to perform the steps of:
closing a negative electrode relay and a pre-charging relay of a first battery cluster, wherein the pre-charging relay is arranged between a positive electrode of the first battery cluster and a positive electrode of a main loop, and a pre-charging resistor is connected in series on the pre-charging relay;
acquiring the circulating current value of a first battery cluster, and judging whether the circulating current value meets a preset value or not;
and if the preset value is met, closing the positive relay, and opening the pre-charging relay.
It should be understood that, although the steps in the flowcharts of the embodiments of the present invention are shown in order as indicated by the arrows, these steps are not necessarily performed in order as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in various embodiments may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor do the order in which the sub-steps or stages are performed necessarily performed in sequence, but may be performed alternately or alternately with at least a portion of the sub-steps or stages of other steps or other steps.
Those skilled in the art will appreciate that all or part of the processes in the methods of the above embodiments may be implemented by a computer program for instructing relevant hardware, where the program may be stored in a non-volatile computer readable storage medium, and where the program, when executed, may include processes in the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The foregoing examples illustrate only a few embodiments of the invention and are described in detail herein without thereby limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (7)

1. The battery cluster access method is characterized by comprising the following steps of:
closing a negative electrode relay and a pre-charging relay of a first battery cluster, wherein the pre-charging relay is arranged between a positive electrode of the first battery cluster and a positive electrode of a main loop, and a pre-charging resistor is connected in series on the pre-charging relay;
acquiring the circulating current value of a first battery cluster, and judging whether the circulating current value meets a preset value or not;
if the preset value is met, closing the positive relay, and opening the pre-charging relay;
the method comprises the following steps of:
acquiring a total voltage value of a battery cluster which is integrated into a total loop and a voltage value of a first battery cluster;
judging whether the difference value between the total voltage value and the voltage value of the first battery cluster meets a preset value or not;
if the preset value is met, closing a negative electrode relay of the first battery cluster and a pre-charging relay;
the method comprises the following steps of:
after a preset time interval, obtaining a load voltage;
judging whether the load voltage exceeds a preset value, if so, completing the pre-charging;
the method further comprises the steps of:
judging whether the first battery cluster is electrified successfully or not;
if the first battery cluster is successfully electrified, a difference value between the total voltage of the second battery cluster and the total voltage of the first battery cluster is obtained, and if the difference value meets a preset value, the second battery cluster is controlled to be electrified at high voltage;
and if the first battery cluster is not powered on successfully, controlling the second battery cluster to be powered on at high voltage.
2. The battery cluster access method according to claim 1, wherein controlling the second battery cluster to be powered up at a high voltage comprises the following steps:
closing a negative electrode relay and a pre-charging relay of the second battery cluster;
acquiring a second battery cluster ring current value and load voltage;
judging whether the circulating current value and the load voltage meet a preset value or not;
and if the preset value is met, closing the positive relay, and opening the pre-charging relay.
3. The battery cluster access method of claim 1, wherein the pre-charge relay is maintained on for a preset period of time before the pre-charge relay is turned off.
4. A battery cluster access device, the battery cluster access device comprising:
the pre-charging module is used for closing the negative relay and the pre-charging relay of the first battery cluster, wherein the pre-charging relay is arranged between the positive electrode of the first battery cluster and the positive electrode of the total loop, and is connected with a pre-charging resistor in series;
the acquisition module is used for acquiring the circulating current value of the first battery cluster and judging whether the circulating current value meets a preset value or not;
the operation module is used for closing the positive relay and opening the pre-charging relay if the preset value is met;
the pre-charging module further comprises before: the first module is used for acquiring the total voltage value of the battery cluster which is integrated into the total loop and the voltage value of the first battery cluster;
a second module, configured to determine whether a difference between the total voltage value and the voltage value of the first battery cluster meets a preset value; if the preset value is met, closing a negative electrode relay of the first battery cluster and a pre-charging relay;
the priming module further comprises: the third module is used for acquiring load voltage after a preset time interval;
a fourth module, configured to determine whether the load voltage exceeds a preset value, and if yes, complete pre-charging;
a fifth module, configured to determine whether the first battery cluster is powered on successfully;
if the first battery cluster is successfully electrified, a difference value between the total voltage of the second battery cluster and the total voltage of the first battery cluster is obtained, and if the difference value meets a preset value, the second battery cluster is controlled to be electrified at high voltage;
and if the first battery cluster is not powered on successfully, controlling the second battery cluster to be powered on at high voltage.
5. An energy storage power station, the energy storage power station comprising:
n battery clusters which are arranged in parallel, wherein N is a positive integer greater than or equal to 2; and
the battery cluster access device of claim 4, the battery cluster access device for controlling a battery cluster access load.
6. A computer device comprising a memory and a processor, the memory having stored therein a computer program which, when executed by the processor, causes the processor to perform the steps of the battery cluster access method of any of claims 1 to 3.
7. A computer readable storage medium, characterized in that the computer readable storage medium has stored thereon a computer program which, when executed by a processor, causes the processor to perform the steps of the battery cluster access method according to any of claims 1 to 3.
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