CN116581712A - Battery cluster and energy storage system thereof - Google Patents
Battery cluster and energy storage system thereof Download PDFInfo
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- CN116581712A CN116581712A CN202310826868.6A CN202310826868A CN116581712A CN 116581712 A CN116581712 A CN 116581712A CN 202310826868 A CN202310826868 A CN 202310826868A CN 116581712 A CN116581712 A CN 116581712A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 45
- 230000001012 protector Effects 0.000 claims abstract description 163
- 238000012423 maintenance Methods 0.000 claims description 15
- 238000002955 isolation Methods 0.000 claims description 7
- 230000009466 transformation Effects 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 6
- 230000008033 biological extinction Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 9
- 238000001514 detection method Methods 0.000 description 4
- 230000008030 elimination Effects 0.000 description 4
- 238000003379 elimination reaction Methods 0.000 description 4
- 230000001131 transforming effect Effects 0.000 description 4
- 238000004880 explosion Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000006399 behavior Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010200 validation analysis Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
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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
- H02J7/0029—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
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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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The embodiment of the application discloses a battery cluster and an energy storage system thereof. The battery cluster includes: a first stage arc flash protector and n battery packs for storing electrical energy; the first-stage arc flash protector is used for disconnecting the corresponding battery packs in the first time when the corresponding direct current main circuit is short-circuited; the battery pack comprises a third-stage arc flash protector and a battery cell, wherein the third-stage arc flash protector is connected with the battery cell in series, and the first end of the third-stage arc flash protector is connected with the anode of the battery cell; and the third-stage arc flash protector is used for disconnecting the connection between the battery cells in a third time when the corresponding direct current main circuit is short-circuited. Through the mode, the multi-stage short-circuit protection points are arranged, so that short-circuit current can be divided in a shorter time, effective arc extinction is realized, the reliability of the division of the short-circuit current is improved, and arc flash energy is reduced. When any stage of protection point fails, the structure of the multistage protection point can still realize breaking short-circuit current, and the safety of the energy storage system is further improved.
Description
Technical Field
The embodiment of the application relates to the field of battery energy storage, in particular to a battery cluster and an energy storage system thereof.
Background
The battery energy storage technology can smooth the power generation output of renewable energy sources, promote the consumption of distributed renewable energy sources, provide an effective means for peak clipping and valley filling of power loads, and be rapidly popularized and applied in power systems in recent years. Although battery energy storage has many advantages, the biggest obstacle of the battery energy storage system in engineering practical application is the safety problem of the battery, when a single battery or a battery pack is used under abuse conditions such as overcharging, short circuit, punching, puncture, vibration, high-temperature impact and the like, or the external circuit of the battery is short-circuited, the faults cannot be isolated rapidly, the battery energy storage system is extremely easy to burn, even has unsafe behaviors such as explosion and the like, and therefore, irrecoverable loss is caused to an energy storage power station. At present, a plurality of internal or external faults occur at home and abroad to cause explosion events of the energy storage battery, so that casualties and property loss are caused, and the energy storage safety problem cannot be effectively solved.
In the existing hierarchical protection device, pack level protection, cluster level protection and cabin level protection are respectively provided, however, when a short circuit condition occurs, detection of signals such as loop voltage and current is needed, and judgment is carried out through transmitted data, a certain delay is caused by the system, the system is complex, the reliability cannot be ensured, once signal acquisition deviates and fails, the protection of the whole system is invalid, and fire disasters and other major accidents are caused.
Disclosure of Invention
In order to solve the technical problems, one technical scheme adopted by the embodiment of the application is as follows: provided is a battery cluster including: a first stage arc flash protector and n battery packs for storing electrical energy; when n is an even number, the first stage arc flash protector is arranged between the nth/2 battery pack and the (n/2) +1 battery pack; when n is an odd number, the first stage arc flash protector is disposed between the (n-1)/2 th battery pack and the (n+1)/2 th battery pack; the first-stage arc flash protector is used for disconnecting the corresponding battery packs in the first time when the corresponding direct current main circuit is short-circuited; the battery pack comprises a third-stage arc flash protector and a battery cell, wherein the third-stage arc flash protector is connected with the battery cell in series, and the first end of the third-stage arc flash protector is connected with the anode of the battery cell; and the third-stage arc flash protector is used for disconnecting the connection between the battery cells in a third time when the corresponding direct current main circuit is short-circuited.
In some embodiments, the first stage arc flash protector is a first fuse and the third stage arc flash protector is a third fuse.
In order to solve the technical problems, the application adopts another technical scheme that: there is provided an energy storage system comprising: the device comprises a current transformation device, a fourth-stage arc flash protector, a direct current bus and a plurality of direct current main ways, wherein the first end of the fourth-stage arc flash protector is connected to the direct current side of the current transformation device, and the second end of the fourth-stage arc flash protector is connected to the direct current bus; the fourth-stage arc flash protector is used for disconnecting the connection between the converter equipment and the direct current bus in fourth time when the energy storage system is in short circuit; the direct current main circuit comprises a second-stage arc flash protector and the battery cluster; the first end of the second-stage arc flash protector is connected to the direct-current bus, and the second end of the second-stage arc flash protector is connected to the battery cluster; the second-stage arc flash protector is used for disconnecting the connection between the corresponding battery cluster and the direct current bus in a second time when the corresponding direct current main is short-circuited.
In some embodiments, the dc trunk further comprises a second disconnector and a high voltage dc contactor, wherein a first end of the second disconnector is connected to the dc bus, a second end of the second disconnector is connected to a first end of the high voltage dc contactor, and a second end of the high voltage dc contactor is connected to a first end of the second stage arc flash protector.
In some embodiments, the dc link further comprises a manual maintenance protection switch and a voltage sampling point, wherein a first end of the manual maintenance protection switch is connected to a second end of the second stage arc flash protector, and a second end of the manual maintenance protection switch is connected to the battery cluster; the voltage sampling point is arranged between the second-stage arc flash protector and the manual maintenance protection switch.
In some embodiments, the fourth stage arc flash protector comprises a first isolation switch and a fourth fuse, wherein a first end of the first isolation switch is connected to the dc side of the current transforming device, a second end of the first isolation switch is connected to a first end of the fourth fuse, and a second end of the fourth fuse is connected to the dc bus.
In some embodiments, the first time is less than the second time, the second time is less than the third time, and the third time is less than the fourth time.
In some embodiments, the fourth stage arc flash protector is a circuit breaker.
In some embodiments, the second stage arc flash protector is a second fuse.
In some embodiments, the first fuse, the second fuse, the third fuse, and the fourth fuse are all aR-type fuses.
The beneficial effects of the embodiment of the application are as follows: compared with the prior art, the embodiment of the application has the advantages that the multistage short-circuit protection points are arranged, the detection and the feedback of signals are not needed, the short-circuit current can be separated within 0.1ms at the lowest, and the effective arc extinction is realized. The reliability of short-circuit current breaking is improved, the fault elimination time of the short-circuit current is shortened, and the arc flash energy is reduced. When any stage of protection point fails, the structure of the multistage protection point can still realize breaking short-circuit current, and the safety of the energy storage system is further improved.
Drawings
Fig. 1 is a schematic structural view of a battery cluster according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a first energy storage system according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a second energy storage system according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a third energy storage system according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a fourth stage arc flash protector according to an embodiment of the present application.
Detailed Description
In order that the application may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "upper," "lower," "inner," "outer," "bottom," and the like as used in this specification are used in an orientation or positional relationship based on that shown in the drawings, merely to facilitate the description of the application and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.
In addition, the technical features mentioned in the different embodiments of the application described below can be combined with one another as long as they do not conflict with one another.
Aiming at the conditions that the short-circuit protection reliability of the existing battery energy storage system is low, the maintainability is poor, the battery energy storage system is complex to protect and the safety of arc flash energy is not noticed, the application provides a battery cluster, and the structure schematic diagram of the battery cluster is shown in figure 1. The battery pack 320 includes a first stage arc flash protector 322 and n series-connected battery packs 321, and the battery packs 321 are used for storing electric energy. Wherein a second end of the second stage arc flash protector 322 is connected to a first battery pack 321, and the battery cluster 320 includes at least 2 battery packs.
When n is an even number, the first stage arc flash protector 322 is disposed between the n/2 th battery pack 321 and the (n/2) +1 th battery pack 321; when n is an odd number, the first stage arc flash protector 322 is disposed between the (n-1)/2 th battery pack 321 and the (n+1)/2 th battery pack 321.
The first stage arc flash protector 322 is used for disconnecting the connection between the corresponding battery packs 321 in a first time when the corresponding direct current main circuit is short-circuited. It should be noted that the first time depends on the type and parameters of the first stage arc flash protector 322.
In some embodiments of the present application, the first stage arc flash protector 322 is a first fuse, and the fault clearing time of the first fuse is within 0.1ms, i.e., the first time is 0.1ms. As shown in fig. 1, the battery cluster is connected to a load or a power supply to form a direct current main circuit, and when any one of the battery clusters is short-circuited, the first-stage arc flash protector 322 can disconnect the connection between the front and rear battery packs within 0.1ms so as to avoid damaging the battery packs, the load or the power supply by short-circuit current.
The battery pack 321 comprises a third-stage arc flash protector 3211 and a battery core 3212, wherein the third-stage arc flash protector 3211 is connected with the battery core 3212 in series, and a first end of the third-stage arc flash protector 3211 is connected with an anode of the battery core 3212.
The third stage arc flash protector 3211 is configured to disconnect the connection between the electrical cores 3212 during a third time when a short circuit occurs in the corresponding dc link. It should be noted that the third time depends on the type and parameters of the third-stage arc flash protector 3211.
In some embodiments of the present application, third stage arc flash protector 3211 is a third fuse and the fault clearing time of the third fuse is within 5-20ms, i.e., the third time is 5-20ms. If the battery cluster shown in fig. 1 is connected to a load or a power supply to form a direct current main circuit, when any part of the battery cluster is short-circuited, assuming that the first-stage arc flash protector 322 fails, the third-stage arc flash protector 3211 acts to disconnect the front and rear battery cells within 5-20ms so as to avoid damaging the battery pack, the load or the power supply by short-circuit current.
The multi-stage arc flash protector ensures the safety and reliability of the battery cluster, when a short-circuit accident occurs in a branch formed by the battery cluster, the first fuse serving as the first-stage arc flash protector 322 can be quickly fused, the judgment is carried out without signal monitoring and feedback, the fusing time is in the level of 0.1ms, the arc flash energy pre-estimated value is lower than 0.042cal/cm, the arc flash energy pre-estimated value is greatly lower than the standard value of 1.2cal/cm, and the arc flash boundary is lower than 8cm.
If the first stage arc flash protector 322 fails, the third fuse, which is the third stage arc flash protector 3211, will quickly blow. And if the first-stage arc flash protector 322 is damaged by short-circuit current impact, the first-stage arc flash protector 322 can be replaced conveniently, so that maintainability is improved.
In some embodiments of the application, the first fuse and the third fuse are both aR-type fuses.
It should be noted that the fuses are classified into operation levels according to their functions. The 1 st letter indicates a function level, and the 2 nd letter indicates an object to be protected. Letter 1: a represents local scope protection; g represents full range protection. Letter 2: g represents cable and wire protection; m represents the protection of a switching device; r represents a semiconductor protection; l represents cable and wire protection; the fuse aR represents a local range of semiconductor protection.
According to the embodiment of the application, the multi-stage short-circuit protection points are arranged in the battery cluster, so that when short circuit occurs in a branch formed by the battery cluster, the short-circuit current can be separated within 0.1ms at the minimum without detection and feedback of signals, and effective arc extinction is realized. The method improves the reliability of breaking short-circuit current, shortens the fault elimination time of the short-circuit current, reduces arc flash energy, and can still realize breaking short-circuit current when the structure of the multi-stage protection point breaks down at any stage of protection point, thereby further improving the safety of the battery cluster.
Based on the battery clusters provided in the foregoing embodiments, the embodiment of the present application provides an energy storage system, and a schematic structural diagram of the energy storage system is shown in fig. 2. The energy storage system comprises a current transformation device 20, a fourth-stage arc flash protector 100, a direct current bus 200 and a plurality of direct current main paths 300.
Wherein a first end of the fourth stage arc flash protector 100 is connected to the dc side of the converter device 20 and a second end of the fourth stage arc flash protector 100 is connected to the dc bus 200.
The fourth stage arc flash protector 100 is configured to disconnect the current transforming device 20 from the dc bus 200 for a fourth time when the energy storage system is shorted. It should be noted that the fourth time depends on the type and parameters of the fourth-stage arc flash protector 100.
In some embodiments of the present application, the fourth stage arc flash protector 100 is a circuit breaker and the fault clearing time of the circuit breaker is within 15-40ms, i.e., the fourth time is 15-40ms. The fourth stage arc flash protector 100 is capable of disconnecting the current transformer device 20 from the dc bus 200 within 15-40ms when a short circuit occurs anywhere in the energy storage system as shown in fig. 2.
Dc trunk 300 is connected to dc bus 200, dc trunk 300 includes a second stage arc flash protector 310 and a battery cluster 320, a first end of second stage arc flash protector 310 being connected to dc bus 200. The second end of the second stage arc flash protector 310 is connected to a battery cluster 320, and the battery cluster 320 includes a first stage arc flash protector 322 and n series-connected battery packs 321; wherein a second end of the second stage arc flash protector 322 is connected to a first battery pack 321, and the battery cluster 320 includes at least 2 battery packs.
The second stage arc flash protector 310 is used to disconnect the connection between the corresponding battery cluster 320 and the dc bus 200 for a second time when the corresponding dc link is shorted. It should be noted that the second time depends on the type and parameters of the second stage arc flash protector 310.
In some embodiments of the present application, the second stage arc flash protector 310 is a second fuse, and the fault clearing time of the second fuse is within 1-1.5ms, i.e., the second time is 1-1.5ms. As will occur in the energy storage system shown in fig. 2 at any one of the branches corresponding to the second stage arc flash protector 310, the second stage arc flash protector 310 is able to disconnect the connection between the corresponding battery cluster 320 and the dc bus 200 within 1-1.5ms.
The second stage arc flash protector 310 has a blow time on the order of 1.5ms, an arc flash energy rating below 0.212cal/cm, a far below standard value of 1.2cal/cm, and an arc flash boundary below 19cm.
In connection with the above embodiments, it should be noted that there is priority in the validation of the first stage arc flash protector 322, the second stage arc flash protector 310, the third stage arc flash protector 3211, and the fourth stage arc flash protector 100. In this embodiment, the following priority relationship is determined by selecting the types and parameters of the first-stage arc flash protector 322, the second-stage arc flash protector 310, the third-stage arc flash protector 3211, and the fourth-stage arc flash protector 100: first stage arc flash protector 322> second stage arc flash protector 310> third stage arc flash protector 3211> fourth stage arc flash protector 100. After the arc flash protector with high priority triggers corresponding short-circuit faults, the rest arc flash protectors cannot trigger.
If the arc flash protector with high priority fails, the arc flash protector with the next priority can be triggered when corresponding response to the short-circuit failure cannot be made. For example: when the dc main circuit where the first stage arc flash protector 322 is located is shorted, if the first stage arc flash protector 322 fails, the second fuse serving as the second stage arc flash protector 310 will be quickly blown to disconnect the corresponding battery cluster 320 from the dc bus 200. If the first stage arc flash protector 322 and the second stage arc flash protector 310 fail at the same time, the third fuse, which is the third stage arc flash protector 3211, will quickly blow to disconnect the connection between the front and rear two cells 3212. If the first stage arc flash protector 322, the second stage arc flash protector 310 and the third stage arc flash protector 3211 fail at the same time, the circuit breaker as the fourth stage arc flash protector 100 is rapidly triggered to disconnect the current transformer device 20 from the dc bus 200.
In some embodiments of the application, the second fuse is an aR-type fuse.
According to the embodiment of the application, the multistage short-circuit protection points are arranged, so that detection and feedback of signals are not needed, the short-circuit current can be divided into 0.1ms at the lowest, and effective arc extinction is realized. The method has the advantages that the breaking reliability of short-circuit current is improved, the fault elimination time of the short-circuit current is shortened, the arc flash energy is reduced, the breaking short-circuit current can still be realized when any stage of protection point breaks down in the structure of the multistage protection point, and the safety of the energy storage system is further improved.
The embodiment of the application also provides a second energy storage system, and the structural schematic diagram of the second energy storage system is shown in fig. 3. The energy storage system comprises a current transformation device 20, a fourth-stage arc flash protector 100, a direct current bus 200 and a plurality of direct current main paths 300.
Wherein a first end of the fourth stage arc flash protector 100 is connected to the dc side of the converter device 20 and a second end of the fourth stage arc flash protector 100 is connected to the dc bus 200.
The fourth stage arc flash protector 100 is configured to disconnect the current transforming device 20 from the dc bus 200 for a fourth time when the energy storage system is shorted. It should be noted that the fourth time depends on the type and parameters of the fourth-stage arc flash protector 100.
In some embodiments of the present application, the fourth stage arc flash protector 100 is a circuit breaker and the fault clearing time of the circuit breaker is within 15-40ms, i.e., the fourth time is 15-40ms. The fourth stage arc flash protector 100 is capable of disconnecting the current transformer device 20 from the dc bus 200 within 15-40ms when a short circuit occurs anywhere in the energy storage system as will be shown in fig. 3.
The dc trunk 300 is connected to the dc bus 200, and the dc trunk 300 includes a second stage arc flash protector 310, a battery cluster 320, a second isolating switch 330, and a high voltage dc contactor 340, a first end of the second stage arc flash protector 310 being connected to the dc bus 200.
Wherein, the first end of the second isolating switch 330 is connected to the dc bus 200, the second end of the second isolating switch 330 is connected to the first end of the high voltage dc contactor 340, and the second end of the high voltage dc contactor 340 is connected to the first end of the second stage arc flash protector 310.
The second end of the second stage arc flash protector 310 is connected to a battery cluster 320, and the battery cluster 320 includes a first stage arc flash protector 322 and n series-connected battery packs 321; wherein a second end of the second stage arc flash protector 322 is connected to a first battery pack 321, and the battery cluster 320 includes at least 2 battery packs.
The second stage arc flash protector 310 is used to disconnect the connection between the corresponding battery cluster 320 and the dc bus 200 for a second time when the corresponding dc link is shorted. It should be noted that the second time depends on the type and parameters of the second stage arc flash protector 310.
In some embodiments of the present application, the second stage arc flash protector 310 is a second fuse, and the fault clearing time of the second fuse is within 1-1.5ms, i.e., the second time is 1-1.5ms. As will occur in the energy storage system shown in fig. 3, the second stage arc flash protector 310 is able to disconnect the connection between the corresponding battery cluster 320 and the dc bus 200 within 1-1.5ms when a short circuit occurs at any of the branches corresponding to the second stage arc flash protector 310.
The embodiment of the application also provides a third energy storage system, and the structural schematic diagram of the third energy storage system is shown in fig. 4. The energy storage system comprises a current transformation device 20, a fourth-stage arc flash protector 100, a direct current bus 200 and a plurality of direct current main paths 300.
Wherein a first end of the fourth stage arc flash protector 100 is connected to the dc side of the converter device 20 and a second end of the fourth stage arc flash protector 100 is connected to the dc bus 200.
The fourth stage arc flash protector 100 is configured to disconnect the current transforming device 20 from the dc bus 200 for a fourth time when the energy storage system is shorted. It should be noted that the fourth time depends on the type and parameters of the fourth-stage arc flash protector 100.
In some embodiments of the present application, the fourth stage arc flash protector 100 is a circuit breaker and the fault clearing time of the circuit breaker is within 15-40ms, i.e., the fourth time is 15-40ms. The fourth stage arc flash protector 100 is capable of disconnecting the current transformer device 20 from the dc bus 200 within 15-40ms when a short circuit occurs anywhere in the energy storage system as shown in fig. 4.
Dc trunk 300 is connected to dc bus 200, dc trunk 300 includes a second stage arc flash protector 310, a battery cluster 320, a second isolation switch 330, a high voltage dc contactor 340, a manual maintenance protection switch 350, and a voltage sampling point 360, a first end of second stage arc flash protector 310 being connected to dc bus 200.
It should be noted that, the manual maintenance protection switch (Manual Service Disconnect, MSD) is used for protecting the safety of technicians who maintain the electric automobile in a high-voltage environment or an emergency of strain, and can quickly separate the connection of the high-voltage circuit, so that the maintenance work is in a safer state, such as external short-circuit protection, and the high-voltage needs to be disconnected during maintenance.
Wherein, the first end of the second isolating switch 330 is connected to the dc bus 200, the second end of the second isolating switch 330 is connected to the first end of the high voltage dc contactor 340, and the second end of the high voltage dc contactor 340 is connected to the first end of the second stage arc flash protector 310.
A second end of the second stage arc flash protector 310 is connected to a first end of the manual maintenance protection switch 350, and a voltage sampling point 360 is provided between the second stage arc flash protector 310 and the manual maintenance protection switch 350; a second end of the manual maintenance protection switch 350 is connected to a battery cluster 320, and the battery cluster 320 includes a first stage arc flash protector 322 and n series-connected battery packs 321; wherein a second end of the second stage arc flash protector 322 is connected to a first battery pack 321, and the battery cluster 320 includes at least 2 battery packs.
The second stage arc flash protector 310 is used to disconnect the connection between the corresponding battery cluster 320 and the dc bus 200 for a second time when the corresponding dc link is shorted. It should be noted that the second time depends on the type and parameters of the second stage arc flash protector 310.
In some embodiments of the present application, the second stage arc flash protector 310 is a second fuse, and the fault clearing time of the second fuse is within 1-1.5ms, i.e., the second time is 1-1.5ms. As will occur in the energy storage system shown in fig. 4, the second stage arc flash protector 310 is able to disconnect the connection between the corresponding battery cluster 320 and the dc bus 200 within 1-1.5ms when a short circuit occurs at any one of the branches corresponding to the second stage arc flash protector 310.
The core devices of the energy storage system provided by the embodiment of the application are fuses, are all set as aR type fuses, are independent of the existing three-stage BMS control system, and are provided with four-stage short-circuit protection points corresponding to four-stage arc flash protectors, short-circuit current is divided into 0.1ms at the lowest, and the energy storage system can effectively extinguish arc, so that the reliability of breaking the short-circuit current is improved, the fault elimination time of the short-circuit current is greatly shortened, the arc flash energy is reduced, and the breaking of the short-circuit current can still be realized when the structure of the multi-stage protection points breaks down at any stage protection point, so that the safety of the energy storage system is further improved.
In the above embodiment, the fourth-stage arc flash protector 100 is a circuit breaker, and another fourth-stage arc flash protector 100 is provided in the embodiment of the present application, and the schematic structural diagram of the fourth-stage arc flash protector 100 is shown in fig. 5. The fourth stage arc flash protector 100 includes a first isolation switch 110 and a fourth fuse 120.
Wherein, the first end of the first isolating switch 110 is connected to the dc side of the current transformer 20, the second end of the first isolating switch 110 is connected to the first end of the fourth fuse 120, and the second end of the fourth fuse 120 is connected to the dc bus 200.
In some embodiments of the present application, the fourth fuse 120 is an aR-type fuse.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the application, the steps may be implemented in any order, and there are many other variations of the different aspects of the application as above, which are not provided in details for the sake of brevity; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (10)
1. A battery cluster, comprising:
a first stage arc flash protector and n battery packs for storing electrical energy;
when n is even, the first stage arc flash protector is arranged between the nth/2 battery pack and the (n/2) +1 battery pack; when n is an odd number, the first stage arc flash protector is disposed between the (n-1)/2 th battery pack and the (n+1)/2 th battery pack;
the first-stage arc flash protector is used for disconnecting the corresponding battery packs in a first time when the corresponding direct current main circuit is short-circuited;
the battery pack comprises a third-stage arc flash protector and a battery cell, wherein the third-stage arc flash protector is connected with the battery cell in series, and a first end of the third-stage arc flash protector is connected with an anode of the battery cell;
and the third-stage arc flash protector is used for disconnecting the connection between the battery cells in a third time when the corresponding direct current main circuit is short-circuited.
2. The battery cluster of claim 1, wherein the first stage arc flash protector is a first fuse and the third stage arc flash protector is a third fuse.
3. An energy storage system, comprising: the device comprises a converter device, a fourth-stage arc flash protector, a DC bus and a plurality of DC main circuits, wherein,
the first end of the fourth-stage arc flash protector is connected to the direct current side of the current transformation device, and the second end of the fourth-stage arc flash protector is connected to the direct current bus;
the fourth-stage arc flash protector is used for disconnecting the connection between the converter equipment and the direct current bus in a fourth time when the energy storage system is in short circuit;
the dc trunk includes a second stage arc flash protector, and a battery cluster as claimed in claim 1 or 2;
a first end of the second-stage arc flash protector is connected to the direct current bus, and a second end of the second-stage arc flash protector is connected to the battery cluster;
and the second-stage arc flash protector is used for disconnecting the connection between the corresponding battery cluster and the direct current bus in a second time when the corresponding direct current main circuit is short-circuited.
4. The system of claim 3, wherein the DC trunk further comprises a second isolation switch and a high voltage DC contactor, wherein,
the first end of the second isolating switch is connected to the direct current bus, the second end of the second isolating switch is connected to the first end of the high-voltage direct current contactor, and the second end of the high-voltage direct current contactor is connected to the first end of the second-stage arc flash protector.
5. The system of claim 3, wherein the DC trunk further comprises a manual maintenance protection switch and a voltage sampling point, wherein,
a first end of the manual maintenance protection switch is connected to a second end of the second-stage arc flash protector, and a second end of the manual maintenance protection switch is connected to the battery cluster;
the voltage sampling point is arranged between the second-stage arc flash protector and the manual maintenance protection switch.
6. The system of claim 3, wherein the fourth stage arc flash protector comprises a first isolation switch and a fourth fuse, wherein,
the first end of the first isolating switch is connected to the direct current side of the current transformation device, the second end of the first isolating switch is connected to the first end of the fourth fuse, and the second end of the fourth fuse is connected to the direct current bus.
7. The system of claim 3, wherein the first time is less than the second time, the second time is less than the third time, and the third time is less than the fourth time.
8. The system of claim 3, wherein the fourth stage arc flash protector is a circuit breaker.
9. The system of any of claims 3-8, wherein the second stage arc flash protector is a second fuse.
10. The system of claim 9, wherein the first fuse, the second fuse, the third fuse, and the fourth fuse are all aR-type fuses.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310826868.6A CN116581712A (en) | 2023-07-07 | 2023-07-07 | Battery cluster and energy storage system thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310826868.6A CN116581712A (en) | 2023-07-07 | 2023-07-07 | Battery cluster and energy storage system thereof |
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