CN110703122A - Electrochemical energy storage system and insulation detection method thereof - Google Patents
Electrochemical energy storage system and insulation detection method thereof Download PDFInfo
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- CN110703122A CN110703122A CN201910977812.4A CN201910977812A CN110703122A CN 110703122 A CN110703122 A CN 110703122A CN 201910977812 A CN201910977812 A CN 201910977812A CN 110703122 A CN110703122 A CN 110703122A
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- insulation detection
- insulation
- energy storage
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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- 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
Abstract
The invention provides an electrochemical energy storage system and an insulation detection method thereof, wherein the insulation detection method of the electrochemical energy storage system comprises the following steps: when the electrochemical energy storage system is in an initial shutdown state, the insulation impedances detected by all insulation detection devices in the electrochemical energy storage system are obtained, if the insulation impedances detected by all the insulation detection devices are within a preset range, when a startup instruction is received, all positive and negative electrode switches in a direct current main loop of the electrochemical energy storage system are controlled to be closed, the insulation detection devices of the BCP are controlled to be in a detection state, and other insulation detection devices are controlled to be in an open state, so that in the operation process of the electrochemical energy storage system, the insulation detection devices of the BCP are in a detection state, mutual influence among all the insulation detection devices is avoided, the real ground insulation impedance of the electrochemical energy storage system is accurately reflected, the short-circuit fault risk of the electrochemical energy storage system is reduced, and the safety of the electrochemical energy storage system is improved.
Description
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to an electrochemical energy storage system and an insulation detection method thereof.
Background
In the electrochemical energy storage system, as shown in fig. 1, a plurality of batteries are connected in series to form a battery pack, and a plurality of battery packs are connected in parallel to form a battery system; therefore, the capacity of the battery system can be flexibly configured by the series connection and the parallel connection of the batteries.
In the prior art, each battery pack is independently integrated with an insulation detection device, so that the insulation impedance detection of the corresponding battery pack is realized; in general, an independent insulation detection device is also integrated into each of a BCP (Battery Collection Panel) and a PCS (Power Conversion System) to detect the insulation impedance of each of them.
The insulation detection devices can independently realize insulation impedance detection of the corresponding devices, but under the condition that the insulation detection devices exist simultaneously, the insulation detection devices can be influenced mutually, so that the insulation impedance of the electrochemical energy storage system to the ground cannot be really and effectively detected, the electrochemical energy storage system has short-circuit fault risk, and the safety is low.
Disclosure of Invention
In view of the above, an object of the present invention is to provide an electrochemical energy storage system and an insulation detection method thereof, so as to reduce the risk of short-circuit failure of the electrochemical energy storage system and improve the safety of the electrochemical energy storage system.
The invention discloses an insulation detection method of an electrochemical energy storage system in a first aspect, which comprises the following steps:
under the condition that the electrochemical energy storage system is in an initial shutdown state, obtaining insulation resistance detected by each insulation detection device in the electrochemical energy storage system;
judging whether the insulation resistance detected by each insulation detection device is within a preset range;
if the insulation resistance detected by at least one insulation detection device is not in the preset range, judging that the equipment where the corresponding insulation detection device is located is abnormal in insulation;
if the insulation impedances detected by the insulation detection devices are within a preset range, when a starting-up instruction is received, the positive and negative electrode switches in the direct-current main loop of the electrochemical energy storage system are controlled to be closed, the insulation detection devices of the direct-current side battery confluence cabinet BCP in the electrochemical energy storage system are controlled to be in a detection state, and other insulation detection devices are controlled to be in an off state.
Optionally, the dc main loop includes: a battery system and the BCP;
the method for controlling the closing of the positive and negative switches in the direct current main loop of the electrochemical energy storage system and controlling the insulation detection device of the direct current side battery confluence cabinet BCP in the electrochemical energy storage system to be in a detection state and other insulation detection devices to be in an off state comprises the following steps:
controlling the positive and negative switches of the BCP to be closed, and controlling the fling-cut switches of the insulation detection device of the BCP to be closed;
and controlling the positive and negative switches of each battery pack in the battery system to be closed, and controlling the switching switches of the insulation detection devices of each battery pack to be opened.
Optionally, the dc main loop includes: the battery system, the BCP and the energy storage converter PCS are arranged;
the method for controlling the closing of the positive and negative switches in the direct current main loop of the electrochemical energy storage system and controlling the insulation detection device of the direct current side battery confluence cabinet BCP in the electrochemical energy storage system to be in a detection state and other insulation detection devices to be in an off state comprises the following steps:
controlling the positive and negative switches of the BCP to be closed, and controlling the fling-cut switches of the insulation detection device of the BCP to be closed;
controlling the positive and negative switches of each battery pack in the battery system to be closed, and switching the on-off switches of the insulation detection devices of each battery pack to be opened;
and controlling the positive and negative switches of the PCS to be closed, and controlling the fling-cut switches of the insulation detection device of the PCS to be opened.
Optionally, after controlling the positive and negative switches of the BCP to be both closed and the on-off switches of the insulation detection device of the BCP to be both closed, the method further includes:
and judging whether the insulation resistance detected by each insulation detection device is within a preset range.
Optionally, controlling that the positive and negative switches of the BCP are all closed, and after the on-off switch of the insulation detection device of the BCP is all closed, and the positive and negative switches of each battery pack in the control battery system are all closed, and after the on-off switch of the insulation detection device of each battery pack is all opened, the method further includes:
and judging whether the insulation resistance detected by each insulation detection device in the detection state is in a preset range.
Optionally, before the positive and negative switches of each battery pack in the control battery system are all closed and the switching switches of the insulation detection devices of each battery pack are all opened, the method further includes:
acquiring voltage difference of each battery pack in the battery system;
judging whether the voltage difference is within a preset normal range;
and if the voltage difference is within a preset normal range, executing the steps of closing the positive and negative switches of each battery pack in the control battery system and opening the switching switches of the insulation detection devices of each battery pack.
Optionally, after the determining that the device where the corresponding insulation detection device is located is abnormal in insulation, the method further includes:
and generating and outputting an alarm signal and/or a protection trigger signal.
Optionally, before the generating and outputting the alarm signal and/or the protection trigger signal, the method further includes:
and determining the position of the equipment with the insulation abnormity in the electrochemical energy storage system.
In a second aspect, the present invention discloses an electrochemical energy storage system, comprising: a battery system, a battery management system and a BCP; wherein:
the battery system includes: a plurality of battery packs connected in parallel;
each battery pack and the BCP are respectively provided with a corresponding insulation detection device;
the battery management system includes: a BSMU (Battery system management unit) disposed in the BCP, and a plurality of BCMUs (Battery cluster management units) respectively disposed in the respective Battery packs;
the BSMU is connected with the control end of the positive and negative pole switches in the BCP, the control end of the fling-cut switch of the insulation detection device and the output end of the insulation detection device;
the BCMU is connected with the control ends of the positive and negative pole switches in the corresponding battery pack, the control end of the fling-cut switch of the insulation detection device and the output end of the insulation detection device;
the BSMUs are communicatively connected to the respective BCMUs, and the BSMUs are configured to perform the insulation detection method of the electrochemical energy storage system disclosed in any one of the first aspect.
Optionally, the insulation detection device in each battery pack:
one input end is connected between the positive electrode and the positive electrode switch of the battery series branch of the corresponding battery pack through the corresponding fling-cut switch;
and the other input end is connected between the negative pole of the battery series branch of the corresponding battery pack and the negative pole switch through the corresponding fling-cut switch.
Optionally, the insulation detecting device in the BCP:
one input end is connected between the positive switch of the BCP and the positive output copper bar through a corresponding fling-cut switch;
the other input end is connected between the negative switch of the BCP and the negative output copper bar through a corresponding fling-cut switch;
and the two input ends are also respectively connected with the anode and the cathode of the auxiliary power supply.
Optionally, the method further includes: PCS;
a corresponding insulation detection device is arranged in the PCS;
and the controller of the PCS is in communication connection with the BSMU and is connected with the control ends of the positive and negative switches in the PCS, the switching switch of the insulation detection device, the output end of the insulation detection device and the control end of the inverter circuit.
Optionally, the insulation detection device in the PCS:
one input end is connected between the positive switch of the PCS and the positive electrode of the direct current side of the inverter circuit through a corresponding fling-cut switch;
and the other input end is connected between the negative electrode switch of the PCS and the negative electrode of the direct current side of the inverter circuit through a corresponding fling-cut switch.
Optionally, the method further includes: a temperature control System, a fire protection System, and an EMS (Energy Management System);
the EMS is respectively in communication connection with the temperature control system, the fire fighting system and the BSMU, and an external communication interface is arranged on the EMS.
According to the technical scheme, the insulation detection method of the electrochemical energy storage system, provided by the invention, obtains the insulation resistance detected by each insulation detection device in the electrochemical energy storage system when the electrochemical energy storage system is in an initial shutdown state, and judges whether the insulation resistance detected by each insulation detection device is within a preset range; if the insulation impedances detected by the insulation detection devices are within the preset range, when a starting-up instruction is received, the positive and negative electrode switches in the direct-current main loop of the electrochemical energy storage system are controlled to be closed, the insulation detection devices of the BCP are controlled to be in a detection state, and other insulation detection devices are controlled to be in an off state, so that the insulation detection devices of the BCP are in the detection state in the operation process of the electrochemical energy storage system, the mutual influence among the insulation detection devices is avoided, the real ground insulation impedance of the electrochemical energy storage system is accurately reflected, the short-circuit fault risk of the electrochemical energy storage system is reduced, and the safety of the electrochemical energy storage system is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of an electrochemical energy storage system provided by the prior art;
FIG. 2 is a schematic diagram of an electrochemical energy storage system provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram of another electrochemical energy storage system provided by an embodiment of the present invention;
FIG. 4 is a flow chart of a method for insulation detection in an electrochemical energy storage system according to an embodiment of the present invention;
FIG. 5 is a flow chart of another method for insulation detection in an electrochemical energy storage system according to an embodiment of the present invention;
FIG. 6 is a flow chart of another method for insulation detection in an electrochemical energy storage system according to an embodiment of the present invention;
fig. 7 is a schematic diagram of another electrochemical energy storage system provided by an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiment of the invention provides an insulation detection method of an electrochemical energy storage system, which aims to reduce the risk of short-circuit faults of the electrochemical energy storage system and improve the safety of the electrochemical energy storage system.
The electrochemical energy storage system at least comprises: battery system 10, battery management system and BCP30, as shown in fig. 2; in practice, the electrochemical energy storage system may also be integrated with a PCS 40, as shown in fig. 3. Wherein:
the battery system 10 includes: a plurality of battery packs 11 connected in parallel; respective insulation detecting means (14 and 32 shown in fig. 2) are provided in each of the battery packs 11 and the BCP 30.
The connection relationship of the insulation detection devices 14 in the respective battery packs 11 is: one input terminal is connected between the positive electrode of the battery series branch of the corresponding battery pack 11 and the positive electrode switch (K1 shown in fig. 2) through the corresponding switching switch (K3 shown in fig. 2); the other input terminal is connected between the negative pole of the battery series branch of the corresponding battery pack 11 and the negative pole switch (K2 shown in fig. 2) through a corresponding switching switch (K4 shown in fig. 2). When the positive-negative pole switch 12 of each battery pack 11 is turned off, the battery series branch of each battery pack 11 supplies a detection voltage to the insulation detection device 14 corresponding to each battery pack.
The connection relationship of the insulation detecting device 32 in the BCP30 is: one input end is connected between a positive switch (K5 shown in figure 2) of the BCP30 and a positive output copper bar through a corresponding fling-cut switch (K7 shown in figure 2); the other input end is connected between a negative switch (K6 shown in figure 2) of the BCP30 and a negative output copper bar through a corresponding fling-cut switch (K8 shown in figure 2); the two input ends are also respectively connected with the anode and the cathode of the auxiliary power supply; therefore, the auxiliary power supply supplies the detection voltage to the insulation detection device 32 of the BCP30 when the positive and negative electrode switches 31 of the BCP30 are turned off.
The battery management system includes: a BSMU21 provided in the BCP30, and a plurality of BCMUs 22 provided in the respective battery packs 11, respectively.
The insulation detecting device 32 of the BCP30 detects the insulation resistance of the BCP30 and transmits the detected insulation resistance to the BSMU21, and in addition, the insulation detecting device 14 of each battery pack 11 detects the insulation resistance of the corresponding battery pack 11 and transmits the detected insulation resistance to the corresponding BCMU 22.
The BSMU21 is connected with the control end of a positive-negative switch 31 in the BCP30, the control end of a fling-cut switch 33 of an insulation detection device 32 and the output end of the insulation detection device 32; so that the BSMU21 controls the on and off of the positive and negative electrode switches 31 in the BCP30, controls the on and off of the fling-cut switch 33 of the insulation detection device 32, and receives the insulation resistance detected by the insulation detection device 32.
The BCMU 22 is connected with the control end of the positive and negative pole switch 12 in the corresponding battery pack 11, the control end of the fling-cut switch 15 of the insulation detection device 14 and the output end of the insulation detection device 14, and the BSMU21 is in communication connection with each BCMU 22; so that the BSMU21 controls the on and off of the positive and negative switches 12 in the corresponding battery pack 11, controls the on and off of the on-off switch 15 of the insulation detection device 14, and receives the insulation resistance detected by the insulation detection device 14 through each BCMU 22.
As shown in fig. 3, the PCS 40 of the electrochemical energy storage system is provided with a corresponding insulation detection device 42; the connection relationship of the insulation detecting device 42 in the PCS 40 is: one input end is connected between a positive switch (K9 shown in figure 3) of the PCS 40 and a direct current side positive electrode of the inverter circuit 45 through a corresponding fling-cut switch (K11 shown in figure 3); the other input end is connected between a negative pole switch (K10 shown in figure 3) of the PCS 40 and a negative pole of the DC side of the inverter circuit 45 through a corresponding fling-cut switch (K12 shown in figure 3). When the positive/negative switch 44 of the PCS 40 is turned off, the inverter circuit 45 converts the power in the reverse direction to supply the detection voltage to the insulation detection device 42 of the PCS 40, or an auxiliary power supply may be provided in the PCS 40 to supply the monitoring voltage to the insulation detection device 42 of the PCS 40.
The controller 41 of the PCS 40 is in communication connection with the BSMU21, and is connected to the control terminal of the positive-negative switch 44 of the PCS 40, the control terminal of the fling-cut switch 43 of the insulation detection device 42, the output terminal of the insulation detection device 42, and the control terminal of the inverter circuit 45 of the PCS 40. So that the BSMU21 controls the on and off of the positive and negative switches 44 in the PCS 40, controls the on and off of the on-off switch 43 of the insulation detection device 42, and receives the insulation resistance detected by the insulation detection device 42 through the controller 41 of the PCS 40.
In practice, the insulation detection method described below may be implemented by any controller in the electrochemical energy storage system, such as a local controller or a controller of the PCS 40, and is preferably implemented by the BSMU 21. In the following, the insulation detection method implemented by using BSMU21 is described as an example, please refer to fig. 4, and the insulation detection method of the electrochemical energy storage system specifically includes:
s101, obtaining insulation resistance detected by each insulation detection device in the electrochemical energy storage system when the electrochemical energy storage system is in an initial shutdown state.
It should be noted that, when the electrochemical energy storage system is in an initial shutdown state, the switching switches of the insulation detection devices are all closed, and the positive and negative switches of each device are all opened.
Each of the insulation detecting means (14 and 32 shown in fig. 2) detects the insulation resistance of the corresponding device, and transmits the insulation resistance detected by the insulation detecting means to the corresponding device. Specifically, the insulation detecting device 32 of the BCP30 transmits the detected insulation resistance to the BSMU 21; the insulation detecting device 14 of each battery pack 11 transmits the detected insulation resistance to the corresponding BCMU 22, and each BCMU 22 transmits the received insulation resistance to the BSMU 21. In practical applications, as shown in fig. 3, the insulation detection device 42 of the PCS 40 may be further included to transmit the detected insulation resistance to the controller 41 of the PCS 40, and the controller 41 may transmit the insulation resistance it receives to the BSMU 21.
When the electrochemical energy storage system is in an initial shutdown state, all insulation detection devices in the electrochemical energy storage system do not influence each other, so that the insulation impedance detected by all the insulation detection devices is real and accurate.
S102, judging whether the insulation resistance detected by each insulation detection device is within a preset range.
Specifically, each obtained insulation resistance is respectively judged, and whether the value of the insulation resistance is within a corresponding preset range is judged; here, the preset ranges corresponding to the insulation impedances may be the same or different, depending on the specific application environment.
It should be noted that, under the condition that the requirement for the insulation environment is higher, the lower limit value of the preset range can be set to be larger, and under the condition that the requirement for the insulation environment is lower, the lower limit value of the preset range can be set to be smaller, and the setting of the specific preset range is determined according to the actual situation, and is not repeated here one by one, and is all within the protection range of the present application.
Whether the insulation impedances detected by the insulation detection devices are within a preset range or not is judged to determine whether the equipment of the electrochemical energy storage system is normal or not under the current working condition, and then the subsequent steps are executed under the normal condition, namely, the equipment operates under the normal condition, and the equipment in the electrochemical energy storage system is prevented from being damaged by short circuit.
If the insulation resistance detected by at least one insulation detecting device is not within the preset range, step S103 is executed.
S103, judging that the equipment where the corresponding insulation detection device is located is abnormal in insulation.
It should be noted that, if there is an abnormality in the device in the electrochemical energy storage system and the electrochemical energy storage system is still operating, the device in the electrochemical energy storage system may be damaged by a short circuit, and the electrochemical energy storage system may not operate safely.
Therefore, when the insulation of the equipment where the corresponding insulation detection device is located is judged to be abnormal, an alarm signal and/or a protection trigger signal can be generated and output; the alarm signal can alarm in a subsequent mode of triggering sound, light flashing and the like, so that operation and maintenance personnel can know that the equipment in the electrochemical energy storage system is abnormal in insulation, and corresponding protection actions, maintenance operation and the like are manually realized; the protection trigger signal is used for triggering the electrochemical energy storage system to execute corresponding protection actions, such as controlling the electrochemical system to stop working; both can avoid the electrochemical energy storage system to start up the operation under the condition of insulation fault, lead to the risk of large capacity battery short circuit.
The specific implementation manners of the alarm signal and the protection trigger signal are determined according to actual situations, and are not described herein any more, and are all within the protection scope of the present application. Alarm signal and protection trigger signal can produce simultaneously and output, also can be in tandem, and the warning action of equipment insulation anomaly and electrochemical energy storage system's insulation protection trigger action can go on simultaneously, also can not go on simultaneously, and according to actual conditions and decide can, do not give unnecessary detail here one by one, all are in the protection scope of this application.
In practical application, before the alarm signal and/or the protection trigger signal are generated and output, the position of the equipment with the insulation abnormality in the electrochemical energy storage system can be determined.
Specifically, if it is determined that the insulation impedance detected by at least one insulation detection device is not within the preset range according to the step S102, it may be determined that the device where the reporting module is located is the device with the insulation abnormality according to the reporting module of the insulation impedance (the BSMU21 itself, the controller 41 of the PCS 40, or each BCMU 22), so as to implement location identification of the insulation fault, and the alarm signal generated in accordance with this can enable the operation and maintenance personnel to obtain accurate maintenance and location.
After step S103, if the insulation impedances detected by the insulation detection devices are all within the preset range, it indicates that there is no insulation fault in each device, and a power-on operation may be performed; at this time, step S104 is performed first.
And S104, when a starting-up instruction is received, controlling all positive and negative electrode switches in the direct current main loop of the electrochemical energy storage system to be closed, and controlling an insulation detection device of the BCP in the electrochemical energy storage system to be in a detection state and other insulation detection devices to be in an off state.
The main dc circuit of the electrochemical energy storage system is a main dc power supply circuit of the electrochemical energy storage system, and the BCP and the insulation detection device thereof may be described with reference to fig. 2 or fig. 3 below.
Specifically, as shown in fig. 2, the dc main circuit includes a battery system 10 and a BCP30, the BCP30 is provided with a corresponding insulation detection device 32 in the electrochemical energy storage system, and each battery pack 11 of the battery system 10 is provided with a corresponding insulation detection device 14. Each positive negative pole switch in this electrochemistry energy storage system direct current major loop includes: switches K1, K2, K5 and K6.
As shown in fig. 3, the dc main circuit includes a battery system 10, a BCP30 and a PCS 40, wherein the BCP30 is provided with a corresponding insulation detection device 32, each cell group 11 of the battery system 10 is provided with a corresponding insulation detection device 14, and the PCS 40 is also provided with a corresponding insulation detection device 42. Each positive negative pole switch in this electrochemistry energy storage system direct current major loop includes: switches K1, K2, K5, K6, K9 and K10.
The equipment specifically included in the direct current main loop and the corresponding positive and negative switches thereof are determined according to the actual electrochemical energy storage system, and are all within the protection scope of the application.
The specific process of the step is as follows: when receiving a power-on instruction, the BSMU21 controls the positive and negative switches 31 in the BCP30 to be closed, and sends an instruction to each BCMU 22 (for the electrochemical energy storage system shown in fig. 3, the controller 41 of the PCS 40 is also included) to control the positive and negative switches in the corresponding device to be closed, so that each positive and negative switch (12 and 31 shown in fig. 2; or 12, 31, and 44 shown in fig. 3) in the dc main loop is closed; and, the insulation detection device 32 holding the BCP30 is in the detection state and commands the respective BCMU 22 (for the electrochemical energy storage system shown in fig. 3, also including the controller 41 of the PCS 40) to switch the corresponding insulation detection device (14 as shown in fig. 2; or 14 and 42 as shown in fig. 3) out, i.e. to switch from the detection state to the open state.
In this embodiment, each positive-negative electrode switch in the direct-current main loop of the electrochemical energy storage system is controlled to be closed, the insulation detection device 32 of the BCP30 is controlled to be in a detection state, and other insulation detection devices are controlled to be in an off state, so that the insulation detection device 32 of the BCP30 is in a detection state during the operation of the electrochemical energy storage system, mutual influence between the insulation detection devices is avoided, and the real ground insulation impedance of the electrochemical energy storage system is accurately reflected, thereby reducing the risk of short-circuit fault of the electrochemical energy storage system, and improving the safety of the electrochemical energy storage system.
Optionally, when the dc main circuit includes the battery system 10 and the BCP30, in the embodiment of the present invention, in step S104 in step S4, each positive-negative electrode switch in the dc main circuit of the electrochemical energy storage system is controlled to be closed, and the insulation detection device of the BCP in the electrochemical energy storage system is controlled to be in the detection state, and other insulation detection devices are controlled to be in the disconnection state, referring to fig. 5, which specifically includes:
s201, controlling the positive and negative switches of the BCP to be closed, and controlling the fling-cut switches of the insulation detection device of the BCP to be closed.
Specifically, the BSMU21 directly sends a closing control signal to the positive switch K5 and the negative switch K6 of the BCP30, so that the positive switch K5 and the negative switch K6 of the BCP30 are both closed, and meanwhile, the closing control signals sent to the switching positive switch K7 and the switching negative switch K8 of the insulation detection device 32 of the BCP30 are also kept, so that the switching positive switch K7 and the switching negative switch K8 of the insulation detection device 32 of the BCP30 are both kept closed.
At this time, the on-off switches of the insulation detection devices and the positive and negative switches 31 of the BCP30 are all closed, and the positive and negative switches of the other devices except the BCP30 in the direct current main loop are all opened; taking fig. 3 as an example, the insulation detecting device 32 in the BCP30 at this time can realize the detection of the insulation resistance from the output terminal of each battery pack 11 to the dc side of the inverter circuit inside the PCS 40, and the insulation detecting devices 14 in each battery pack 11 and the insulation detecting devices 42 in the PCS 40 do not affect the insulation detecting device 32 in the BCP30 due to the opening of the switches K1, K2, K9, and K10, and therefore, the insulation resistance detected by each insulation detecting device is a true effective insulation resistance.
S202, controlling the positive and negative switches of each battery pack in the battery system to be closed, and switching the switches of the insulation detection devices of each battery pack to be opened.
The battery system, each battery pack and its positive and negative switches, the insulation detection device and its switching switch can be referred to the description of fig. 2 below.
Specifically, the BSMU21 sends an anode-cathode switch closing instruction and a fling-cut switch opening instruction to the BCMUs 22 corresponding to each battery pack 11 in the battery system 10, and after receiving the anode-cathode switch closing instruction and the fling-cut switch opening instruction sent by the BSMU21, each BCMU 22 sends a closing control signal to the anode switch K1 and the cathode switch K2 of each corresponding battery pack 11, so that the anode switch K1 and the cathode switch K2 of each battery pack 11 in the battery system 10 are both closed; and sending an off control signal to the switching positive switch K3 and the switching negative switch K4 of the insulation detection device 14 of each battery pack 11, so that the switching positive switch K3 and the switching negative switch K4 of the insulation detection device 14 of each battery pack 11 are both turned off, and the insulation detection device 14 of each battery pack 11 is switched from the detection state to the off state.
In the electrochemical energy storage system shown in fig. 2, at this time, each positive-negative electrode switch in the direct-current main circuit of the electrochemical energy storage system is closed, and the insulation detection device 32 in the BCP30 can detect the insulation resistance between the output end of each battery pack 11 and the output copper bar of the BCP 30; since the switches K3 and K4 of the insulation detection device 14 of each battery pack 11 are both open and the insulation detection device 14 of each battery pack 11 is in an open state, the on-off switches of the other insulation detection devices except the insulation detection device 32 of the BCP30 are all open at this time, that is, the other insulation detection devices are all in an open state. In this case, only the insulation detecting device 32 of the BCP30 is in the detecting state among the insulation detecting devices, and there is no problem that the insulation detecting devices affect each other to cause the insulation resistance distortion.
In this embodiment, when the dc main circuit includes the battery system 10 and the BCP30, a process of controlling the on/off of the positive/negative electrode switches of each device and the on/off of the fling-cut switches of the insulation detection devices thereof is provided, and the system is started through the above process, so that the insulation detection device 32 of the BCP30 is not affected by other insulation detection devices when the system is in operation, and mutual influence and interference between the insulation detection devices are avoided, thereby obtaining true and accurate insulation impedance and improving the safety of the electrochemical energy storage system.
In the above control process, in order to avoid the influence of other insulation detection devices on the system startup, it is preferable to first control the insulation detection device to switch to the off state, and then control the positive and negative switches in the corresponding devices to be turned on.
Furthermore, in this embodiment, after step S201, the method may further include: and judging whether the insulation resistance detected by each insulation detection device is within a preset range.
The determination of whether the insulation impedances detected by the insulation detection devices are all within the preset range is the same as the execution process and principle of the step S102, and is not repeated here.
In this embodiment, the purpose of determining whether the insulation impedances detected by the insulation detection devices are all within the predetermined range is to determine whether the insulation impedances in the electrochemical energy storage system are all within the predetermined range before executing step S202, and if the insulation impedances are all within the predetermined range, execute step S202 to avoid the electrochemical energy storage system from continuing to operate and causing a fault when the insulation impedances are not uniform within the predetermined range, and determine whether the insulation impedances detected by the insulation detection devices are all within the predetermined range, so as to avoid the above phenomenon and improve the safety of the electrochemical energy storage system.
Optionally, when the dc main circuit shown in fig. 3 includes the battery system 10, the BCP30 and the PCS 40, in the embodiment of the present invention, in step S104 in fig. 2, each positive-negative switch in the dc main circuit of the electrochemical energy storage system is controlled to be closed, and the insulation detection device of the BCP in the electrochemical energy storage system is controlled to be in a detection state, and other insulation detection devices are controlled to be in an open state, referring to fig. 6, which specifically includes:
s301, controlling the positive and negative switches of the BCP to be closed, and controlling the fling-cut switches of the insulation detection device of the BCP to be closed.
The execution process and principle of step S301 are the same as those of step S201, and are not described in detail here.
S302, controlling the positive and negative switches of each battery pack in the battery system to be closed, and switching the switches of the insulation detection devices of each battery pack to be opened.
The execution process and principle of step S302 are the same as those of step S202, and are not described in detail here. In contrast, in the electrochemical energy storage system shown in fig. 3, when the positive-negative switch 44 of the PCS 40 in the dc main circuit of the electrochemical energy storage system is not closed, the insulation detection device 32 in the BCP30 can detect the insulation resistance between each battery pack 11 and the dc side of the PCS 40, and the switches K3, K4, K9 and K10 are opened, the insulation detection device 14 in each battery pack 11 does not perform the insulation resistance detection operation, and the insulation detection device 42 in the PCS 40 does not affect the insulation detection device 32 in the BCP30, so the insulation resistance detected by each insulation detection device is still the true and effective insulation resistance.
And S303, controlling the positive and negative switches of the PCS to be closed, and controlling the fling-cut switches of the insulation detection device of the PCS to be opened.
The PCS and its positive and negative switches, the insulation detection device and its switching switch can be referred to the description of fig. 3 below.
Specifically, the BSMU21 sends an anode-cathode switch closing instruction and a fling-cut switch opening instruction to the controller 41 of the PCS 40, after receiving the anode-cathode switch closing instruction and the fling-cut switch opening instruction, the controller 41 of the PCS 40 sends closing control signals to the anode switch K9 and the cathode switch K10 of the PCS 40, so that the anode switch K9 and the cathode switch K10 of the PCS 40 are both closed, and sends opening control signals to the fling-cut anode switch K11 and the fling-cut cathode switch K12 of the insulation detection device 42 of the PCS 40, so that the fling-cut anode switch K11 and the fling-cut cathode switch K12 of the insulation detection device 42 of the PCS 40 are both opened.
At this time, each positive-negative switch in the direct-current main loop of the electrochemical energy storage system is closed, and the switching switches of the other insulation detection devices except the insulation detection device 42 of the BCP30 are opened. The insulation detecting device 32 in the BCP30 can realize detection of insulation resistance between each battery pack 11 to the dc side of the inverter circuit inside the PCS 40, and the insulation detecting devices 14 and 42 in the battery packs 11 and PCS 40 are both in the off state due to the opening of the switches K3, K4, K11 and K12, and therefore, the insulation detecting devices other than the insulation detecting device of the BCP30 do not affect the insulation detecting device 32 in the BCP30, and the insulation resistance detected by each insulation detecting device is a true effective insulation resistance.
In this embodiment, when the dc main circuit includes the battery system 10, the BCP30, and the PCS 40, the process of controlling the on/off of the positive/negative switches of each device and the on/off of the fling-cut switches of the insulation detection devices thereof is provided, and the system is started through the above process, so that the insulation detection device 32 of the BCP30 is not affected by other insulation detection devices when the system is in operation, and mutual influence and interference among a plurality of insulation detection devices are avoided, thereby obtaining true and accurate insulation impedance.
In the above control process, in order to avoid the influence of other insulation detection devices on the system startup, it is preferable to first control the insulation detection device to switch to the off state, and then control the positive and negative switches in the corresponding devices to be turned on.
In addition, in this embodiment, after step S301 and step S302, the method may further include: and judging whether the insulation resistance detected by each insulation detection device in the detection state is in a preset range.
The implementation process and principle of the step S102 are the same as those of the above-described step S102, and are not repeated here. In contrast, after step S302, since the insulation detection device 14 of each battery pack 11 is in the off state and the insulation detection device 14 no longer performs the detection operation of the insulation resistance, the insulation detection devices in the detection state herein do not include the insulation detection device 14 of each battery pack 11, and only the insulation resistances detected by the insulation detection device 32 of the BCP30 and the insulation detection device 42 of the PCS 40 may be determined.
Optionally, in the embodiment of fig. 3 or 4 of the present invention, before step S202 or step S302, the description is given by taking fig. 4 as an example, and may further include:
the voltage difference of each battery pack 11 in the battery system 10 is obtained first, and then it is determined whether the voltage difference is within a preset normal range.
Obtaining the voltage of each battery pack 11 in the battery system 10, and obtaining the voltage difference of each battery pack 11 according to a calculation rule; the calculation rule may be to take a difference between the maximum voltage and the minimum voltage in each battery pack 11 as the voltage difference; and the specific algorithm of the voltage difference is only an example, and it is determined according to the actual situation, and all that is within the protection scope of the present application.
If the voltage difference is within the preset normal range, executing step S302; if the voltage difference is not within the preset normal range, voltage equalization is performed through an equalization circuit in the corresponding battery pack 11; the step of determining whether the voltage difference of each battery pack 11 in the battery system 10 is within the preset normal range is performed again until the voltage difference of each battery pack 11 in the battery system 10 is within the preset normal range, and the step S302 is performed.
An embodiment of the present invention provides an electrochemical energy storage system, referring to fig. 2, including: battery system 10, battery management system, and BCP 30.
The battery system 10 includes: a plurality of battery packs 11 connected in parallel; respective insulation detecting means (14 and 32 shown in fig. 2) are provided in each of the battery packs 11 and the BCP 30.
The connection relationship of the insulation detection devices 14 in the respective battery packs 11 is: one input terminal is connected between the positive electrode of the battery series branch of the corresponding battery pack 11 and the positive electrode switch (K1 shown in fig. 2) through the corresponding switching switch (K3 shown in fig. 2); the other input terminal is connected between the negative pole of the battery series branch of the corresponding battery pack 11 and the negative pole switch (K2 shown in fig. 2) through a corresponding switching switch (K4 shown in fig. 2). When the positive-negative pole switch 12 of each battery pack 11 is turned off, the battery series branch of each battery pack 11 supplies a detection voltage to the insulation detection device 14 corresponding to each battery pack.
The connection relationship of the insulation detecting device 32 in the BCP30 is: one input end is connected between a positive switch (K5 shown in figure 2) of the BCP30 and a positive output copper bar through a corresponding fling-cut switch (K7 shown in figure 2); the other input end is connected between a negative switch (K6 shown in figure 2) of the BCP30 and a negative output copper bar through a corresponding fling-cut switch (K8 shown in figure 2); the two input ends are also respectively connected with the anode and the cathode of the auxiliary power supply; therefore, the auxiliary power supply supplies the detection voltage to the insulation detection device 32 of the BCP30 when the positive and negative electrode switches 31 of the BCP30 are turned off.
The battery management system includes: a BSMU21 provided in the BCP30, and a plurality of BCMUs 22 provided in the respective battery packs 11, respectively.
The insulation detecting device 32 of the BCP30 detects the insulation resistance of the BCP30 and transmits the detected insulation resistance to the BSMU21, and in addition, the insulation detecting device 14 of each battery pack 11 detects the insulation resistance of the corresponding battery pack 11 and transmits the detected insulation resistance to the corresponding BCMU 22.
The BSMU21 is connected with the control end of a positive-negative switch 31 in the BCP30, the control end of a fling-cut switch 33 of an insulation detection device 32 and the output end of the insulation detection device 32; so that the BSMU21 controls the on and off of the positive and negative electrode switches 31 in the BCP30, controls the on and off of the fling-cut switch 33 of the insulation detection device 32, and receives the insulation resistance detected by the insulation detection device 32.
The BCMU 22 is connected with the control end of the positive and negative pole switch 12 in the corresponding battery pack 11, the control end of the fling-cut switch 15 of the insulation detection device 14 and the output end of the insulation detection device 14, and the BSMU21 is in communication connection with each BCMU 22; so that the BSMU21 controls the on and off of the positive and negative switches 12 in the corresponding battery pack 11, controls the on and off of the on-off switch 15 of the insulation detection device 14, and receives the insulation resistance detected by the insulation detection device 14 through each BCMU 22.
In practical applications, the battery management system may further include a BMU (battery management Unit) provided in each battery pack 11. The BMU is used to improve the utilization rate of the corresponding battery pack 11, prevent the overcharge and overdischarge of the battery pack 11, prolong the service life of the battery pack 11, and monitor the state of the battery pack 11.
The BSMU21 is used to execute the insulation detection method of the electrochemical energy storage system according to any of the embodiments, and for specific execution processes and principles, reference is made to the embodiments, which are not described in detail herein.
In this embodiment, the electrochemical energy storage system is provided with the insulation detection device 14 independently arranged in each cell group 11 of the cell system 10, the BCP30 is provided with the insulation detection device 32 independently, and the connection manner of each insulation detection device in the electrochemical energy storage system is provided, so that the electrochemical energy storage system has the function of detecting insulation resistance, and can perform corresponding actions according to the insulation resistance, and on the basis of not increasing hardware cost, software logic control is performed through the BSMU21, thereby improving the safety of the electrochemical energy storage system.
In practical applications, referring to fig. 3, the electrochemical energy storage system may further include: the PCS 40.
A corresponding insulation detection device 42 is arranged in the PCS 40; the connection relationship of the insulation detecting device 42 in the PCS 40 is: one input end is connected between a positive switch (K9 shown in figure 3) of the PCS 40 and a direct current side positive electrode of the inverter circuit 45 through a corresponding fling-cut switch (K11 shown in figure 3); the other input end is connected between a negative pole switch (K10 shown in figure 3) of the PCS 40 and a negative pole of the DC side of the inverter circuit 45 through a corresponding fling-cut switch (K12 shown in figure 3). When the positive/negative switch 44 of the PCS 40 is turned off, the inverter circuit 45 converts the power in the reverse direction to supply the detection voltage to the insulation detection device 42 of the PCS 40, or an auxiliary power supply may be provided in the PCS 40 to supply the monitoring voltage to the insulation detection device 42 of the PCS 40.
The controller 41 of the PCS 40 is in communication connection with the BSMU21, and is connected to the control terminal of the positive-negative switch 44 of the PCS 40, the control terminal of the fling-cut switch 43 of the insulation detection device 42, the output terminal of the insulation detection device 42, and the control terminal of the inverter circuit 45 of the PCS 40. So that the BSMU21 controls the on and off of the positive and negative switches 44 in the PCS 40, controls the on and off of the on-off switch 43 of the insulation detection device 42, and receives the insulation resistance detected by the insulation detection device 42 through the controller 41 of the PCS 40.
In practical applications, on the basis of fig. 2 or fig. 3, the electrochemical energy storage system, see fig. 7 (which is illustrated by way of example in fig. 3), may further include: a temperature control system 50, a fire protection system 60, and an EMS 70.
The EMS 70 is respectively connected to the temperature control system 50, the fire fighting system 60 and the BSMU21 in a communication manner, and the EMS 70 is provided with an external communication interface.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (14)
1. An insulation detection method of an electrochemical energy storage system, comprising:
under the condition that the electrochemical energy storage system is in an initial shutdown state, obtaining insulation resistance detected by each insulation detection device in the electrochemical energy storage system;
judging whether the insulation resistance detected by each insulation detection device is within a preset range;
if the insulation resistance detected by at least one insulation detection device is not in the preset range, judging that the equipment where the corresponding insulation detection device is located is abnormal in insulation;
if the insulation impedances detected by the insulation detection devices are within a preset range, when a starting-up instruction is received, the positive and negative electrode switches in the direct-current main loop of the electrochemical energy storage system are controlled to be closed, the insulation detection devices of the direct-current side battery confluence cabinet BCP in the electrochemical energy storage system are controlled to be in a detection state, and other insulation detection devices are controlled to be in an off state.
2. The method of claim 1, wherein the main dc loop comprises: a battery system and the BCP;
the method for controlling the closing of the positive and negative switches in the direct current main loop of the electrochemical energy storage system and controlling the insulation detection device of the direct current side battery confluence cabinet BCP in the electrochemical energy storage system to be in a detection state and other insulation detection devices to be in an off state comprises the following steps:
controlling the positive and negative switches of the BCP to be closed, and controlling the fling-cut switches of the insulation detection device of the BCP to be closed;
and controlling the positive and negative switches of each battery pack in the battery system to be closed, and controlling the switching switches of the insulation detection devices of each battery pack to be opened.
3. The method of claim 1, wherein the main dc loop comprises: the battery system, the BCP and the energy storage converter PCS are arranged;
the method for controlling the closing of the positive and negative switches in the direct current main loop of the electrochemical energy storage system and controlling the insulation detection device of the direct current side battery confluence cabinet BCP in the electrochemical energy storage system to be in a detection state and other insulation detection devices to be in an off state comprises the following steps:
controlling the positive and negative switches of the BCP to be closed, and controlling the fling-cut switches of the insulation detection device of the BCP to be closed;
controlling the positive and negative switches of each battery pack in the battery system to be closed, and switching the on-off switches of the insulation detection devices of each battery pack to be opened;
and controlling the positive and negative switches of the PCS to be closed, and controlling the fling-cut switches of the insulation detection device of the PCS to be opened.
4. The insulation detection method of an electrochemical energy storage system according to claim 2, after controlling both the positive and negative switches of the BCP to be closed and both the on-off switches of the insulation detection device of the BCP to be closed, further comprising:
and judging whether the insulation resistance detected by each insulation detection device is within a preset range.
5. The insulation detection method for the electrochemical energy storage system according to claim 3, wherein after the positive and negative switches controlling the BCP are both closed, and the switching switch of the insulation detection device of the BCP is both closed, and after the positive and negative switches controlling each battery pack in the battery system are both closed, and the switching switch of the insulation detection device of each battery pack is opened, the method further comprises:
and judging whether the insulation resistance detected by each insulation detection device in the detection state is in a preset range.
6. The insulation detection method for the electrochemical energy storage system according to claim 3, wherein before the positive and negative switches of each battery pack in the control battery system are closed and the on-off switch of the insulation detection device of each battery pack is opened, the method further comprises:
acquiring voltage difference of each battery pack in the battery system;
judging whether the voltage difference is within a preset normal range;
and if the voltage difference is within a preset normal range, executing the steps of closing the positive and negative switches of each battery pack in the control battery system and opening the switching switches of the insulation detection devices of each battery pack.
7. The insulation detection method for the electrochemical energy storage system according to any one of claims 1 to 6, wherein after the step of determining that the equipment where the corresponding insulation detection device is located is abnormal in insulation, the method further comprises the following steps:
and generating and outputting an alarm signal and/or a protection trigger signal.
8. The insulation detection method of an electrochemical energy storage system according to claim 7, further comprising, before said generating and outputting an alarm signal and/or a protection trigger signal:
and determining the position of the equipment with the insulation abnormity in the electrochemical energy storage system.
9. An electrochemical energy storage system, comprising: a battery system, a battery management system and a BCP; wherein:
the battery system includes: a plurality of battery packs connected in parallel;
each battery pack and the BCP are respectively provided with a corresponding insulation detection device;
the battery management system includes: the battery system management unit BSMU is arranged in the BCP, and the battery cluster management units BCMU are respectively arranged in each battery pack;
the BSMU is connected with the control end of the positive and negative pole switches in the BCP, the control end of the fling-cut switch of the insulation detection device and the output end of the insulation detection device;
the BCMU is connected with the control ends of the positive and negative pole switches in the corresponding battery pack, the control end of the fling-cut switch of the insulation detection device and the output end of the insulation detection device;
the BSMUs are communicatively coupled to the respective BCMUs, and are configured to perform the insulation detection method of the electrochemical energy storage system according to any one of claims 1 to 8.
10. An electrochemical energy storage system according to claim 9, wherein the insulation detection means in each cell group:
one input end is connected between the positive electrode and the positive electrode switch of the battery series branch of the corresponding battery pack through the corresponding fling-cut switch;
and the other input end is connected between the negative pole of the battery series branch of the corresponding battery pack and the negative pole switch through the corresponding fling-cut switch.
11. The electrochemical energy storage system of claim 9, wherein the insulation detection means in the BCP:
one input end is connected between the positive switch of the BCP and the positive output copper bar through a corresponding fling-cut switch;
the other input end is connected between the negative switch of the BCP and the negative output copper bar through a corresponding fling-cut switch;
and the two input ends are also respectively connected with the anode and the cathode of the auxiliary power supply.
12. The electrochemical energy storage system of claim 9, further comprising: PCS;
a corresponding insulation detection device is arranged in the PCS;
and the controller of the PCS is in communication connection with the BSMU and is connected with the control ends of the positive and negative switches in the PCS, the switching switch of the insulation detection device, the output end of the insulation detection device and the control end of the inverter circuit.
13. The electrochemical energy storage system of claim 12, wherein the insulation detection means in the PCS:
one input end is connected between the positive switch of the PCS and the positive electrode of the direct current side of the inverter circuit through a corresponding fling-cut switch;
and the other input end is connected between the negative electrode switch of the PCS and the negative electrode of the direct current side of the inverter circuit through a corresponding fling-cut switch.
14. An electrochemical energy storage system according to any of claims 9 to 13, further comprising: a temperature control system, a fire fighting system and an energy management system EMS;
the EMS is respectively in communication connection with the temperature control system, the fire fighting system and the BSMU, and an external communication interface is arranged on the EMS.
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Application publication date: 20200117 |