A method for emergency starting of energy storage cabinet

Abstract

The present invention discloses an emergency starting method for an energy storage cabinet, comprising confirming that an AC power supply switch QF3 is in an open state; confirming that a DC load switch QF2 is in a closed state, and a DC / DC power supply DY2 is connected to a battery system to be powered and work; pressing a start button AN, and the DC / DC power supply DY2 is connected to a DC24V power supply terminal ID3 to supply power to a battery control unit BCU; the battery control unit BCU detects that a normally open contact of the start button AN is closed, and the battery control unit BCU obtains a battery system state and confirms that the battery system is in an available state; controlling a relay KA3 coil to be energized, and the relay KA3 normally open contact is closed, and the DC / DC power supply DY2 is stably connected to the DC24V power supply terminal ID3 to supply power to the battery control unit BCU and a DC24V electrical device; controlling the coils of a main positive contactor KM1 and a main negative contactor KM2 to be energized, and a main control circuit is in a connected state, and the battery system supplies power to an energy storage converter PCS, and the energy storage converter PCS starts to convert direct current into alternating current to supply power to an alternating current load.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, and in particular to an emergency starting method for an energy storage cabinet. Background Art

[0002] Although the construction of smart grids has improved the self-healing ability of the power system, it is not realistic to completely avoid large-scale power outages due to the variety of factors that cause power outages. Therefore, after a large power outage occurs, it is of great significance to formulate an effective and reliable recovery plan and quickly restore system power supply to reduce power outage losses.

[0003] Black start means that after the entire power system stops operating due to a fault, the entire system is in a completely "black" state. At this time, it does not rely on the help of other power grids. The generator sets with self-starting capabilities in the system are started to drive the generator sets without self-starting capabilities, gradually expanding the system recovery range and ultimately achieving the recovery of the entire system.

[0004] When the low-voltage power grid that supplies power to the user side of the energy storage cabinet is powered off, the energy storage cabinet is also powered off, and the host computer cannot obtain the status of the energy storage cabinet through the I / O modules, industrial computers, and switches in the energy storage cabinet that are connected to the host computer. It is very important to use the energy storage cabinet's own battery system to achieve emergency start-up of the energy storage cabinet so that the host computer can obtain the status of the energy storage cabinet in time. Summary of the invention

[0005] In view of the problems and shortcomings of the prior art, the present invention provides a novel emergency starting method for an energy storage cabinet.

[0006] The present invention solves the above technical problems through the following technical solutions:

[0007] The present invention provides an emergency starting method for an energy storage cabinet. The energy storage cabinet is provided with a battery system, an energy storage converter PCS, a DC / DC power supply DY2 and a battery control unit BCU. The DC end of the energy storage converter PCS is connected to the battery system through a main control circuit, and the AC end of the energy storage converter PCS is connected to the AC power on the grid side through an AC isolating switch QF1. The output end of the AC isolating switch QF1 is connected to an AC power supply switch QF3, and the AC power supply switch QF3 is connected to auxiliary power equipment of the energy storage cabinet; a DC load switch QF2 and a normally open contact of a main contactor are arranged in series on the main control circuit; the input end of the DC / DC power supply DY2 is connected to the DC load switch QF2 of the main control circuit, and the normally open contact of a relay KA3 is connected in parallel with the normally open contact of a start button AN, and then connected to the output end of the DC / DC power supply DY2 and the DC load switch QF2 of the main control circuit. C24V power supply terminal ID3; DC24V power supply terminal ID3 supplies power to the battery control unit BCU and the DC24V electrical equipment of the energy storage cabinet, and the DC24V electrical equipment of the energy storage cabinet includes an I / O module, an industrial computer and a switch; the battery control unit BCU is connected to the coil of the main contactor to control the power on and off of the main contactor coil to control the on and off of the main control circuit, and the main contactor includes a main positive contactor KM1 and a main negative contactor KM2; the battery control unit BCU is connected to the relay KA3 coil to control the on and off of the normally open contact of the relay KA3; the battery control unit BCU is connected to the normally open contact of the start button AN to obtain the state of the start button AN; the battery control unit BCU is connected to the normally open contact of the DC load switch QF2 to obtain the state of the DC load switch QF2; the emergency starting method of the energy storage cabinet includes:

[0008] Confirm that the AC power switch QF3 is in the open state, confirm that the DC load switch QF2 is in the closed state, and the DC / DC power supply DY2 is connected to the battery system to be powered and work;

[0009] Press the start button AN, the DC / DC power supply DY2 connects to the DC24V power supply terminal ID3 to supply power to the battery control unit BCU;

[0010] The battery control unit BCU detects that the normally open contact of the start button AN is closed, and the battery control unit BCU obtains the battery system status and confirms that the battery system is in an available state;

[0011] The battery control unit BCU controls the relay KA3 coil to be energized, the normally open contact of the relay KA3 is closed, and the DC / DC power supply DY2 is stably connected to the DC24V power supply terminal ID3 to supply power to the battery control unit BCU and the DC24V electrical equipment, and the start button AN can be released at this time;

[0012] The battery control unit BCU controls the coils of the main positive contactor KM1 and the main negative contactor KM2 to be energized, so that the normally open contacts of the main positive contactor KM1 and the main negative contactor KM2 are closed, the main control circuit is in a connected state, and the battery system in the energy storage cabinet supplies power to the energy storage inverter PCS, and the energy storage inverter PCS starts to convert DC power into AC power to supply power to the AC power load.

[0013] Preferably, when the AC power on the grid side is out of power, the AC power supply switch QF3 is manually disconnected, and when the AC power on the grid side is restored, the AC power supply switch QF3 is manually closed, and the power supply and power outage status of the AC power on the grid side are confirmed by the closing and disconnection of the normally open contacts of the AC power supply switch QF3.

[0014] Preferably, when the normally open contact of the AC power supply switch QF3 is in a closed state, the battery control unit BCU controls the relay KA3 coil to lose power, the normally open contact of the relay KA3 opens, and the DC / DC power supply DY2 stops supplying power to the DC24V power supply terminal ID3, and returns to being powered by the AC power on the grid side.

[0015] Preferably, the DC24V power supply terminal ID3 is simultaneously connected to the output end of the BMS control power supply DY1, and the input end of the BMS control power supply DY1 is connected to the power supply circuit of the power grid cabinet UPS through the power switch QF5. When the grid-side AC power is supplied, the grid-side AC power is connected to the power supply circuit of the power grid cabinet UPS, and the DC24V power supply terminal ID3 is powered by the BMS control power supply DY1.

[0016] Preferably, the main control circuit includes main control input connectors B+ and B-, main control output connectors P+ and P-, the main control input connector B+, fuse FU, the DC load switch QF2, the normally open contact of the main positive contactor KM1 and the main control output connector P+ are connected in sequence; the main control input connector B-, the DC load switch QF2, the current sensor, the normally open contact of the main negative contactor KM2 and the main control output connector P- are connected in sequence; the battery control unit BCU obtains the battery system status including: the battery control unit BCU connects the current sensor to collect the main control The current value of the circuit is used as the current value of the battery system, and the battery control unit BCU is connected to the main control circuit to collect the voltage value of the main control circuit as the voltage value of the battery system; the battery control unit BCU collects the current value and voltage value of the battery system and calculates the battery system state. When the available power SOC of the single cell of the battery system is ≥5% and the minimum voltage is ≥2.6V, the battery system is determined to be in an available state; when the available power SOC of the single cell of the battery system is ≤5% or the minimum voltage is ≤2.6V, the battery system is determined to be in an unavailable state.

[0017] Preferably, when the battery system is in an unavailable state, the battery control unit BCU controls the relay KA3 coil to lose power, the normally open contact of the relay KA3 opens, and the DC / DC power supply DY2 stops supplying power to the DC24V power supply terminal ID3.

[0018] Preferably, the battery control unit BCU is connected to a fire sprinkler device to obtain the status of the fire sprinkler device. When the fire sprinkler device is in the on state, the battery control unit BCU controls the relay KA3 coil to lose power, the normally open contact of the relay KA3 opens, and the DC / DC power supply DY2 stops supplying power to the DC24V power supply terminal ID3.

[0019] The positive and progressive effects of the present invention are:

[0020] The energy storage cabinet emergency start method provided by the present invention is provided with a DC / DC power supply DY2 connected to the battery system of the energy storage cabinet; the connection and disconnection of the DC / DC power supply DY2 and the DC24V power supply terminal ID3 are controlled by the start button AN and the relay KA3; when the AC power on the grid side is cut off, the start button AN is pressed, the DC / DC power supply DY2 is connected to the DC24V power supply terminal ID3 to supply power to the battery control unit BCU, the battery control unit BCU detects that the normally open contact of the start button AN is closed, and at the same time the battery control unit BCU obtains the battery system status, confirms that the battery system is in an available state, and controls The coil of the braking relay KA3 is energized, and the DC / DC power supply DY2 provides stable power to the battery control unit BCU and DC24V electrical equipment; the industrial computer and switch of the energy storage cabinet are powered and work, and maintain the connection with the host computer; the coils of the main positive contactor KM1 and the main negative contactor KM2 are controlled to be energized, so that the normally open contacts of the main positive contactor KM1 and the main negative contactor KM2 are closed, and the main control circuit is in a connected state. At this time, the battery system in the energy storage cabinet supplies power to the energy storage inverter PCS, and the energy storage inverter PCS starts to convert DC power into AC power to power the AC power load, realizing the emergency start of the energy storage cabinet.

[0021] Furthermore, when the AC power on the grid side is restored, the battery system is in an unavailable state, or the fire sprinkler device is in an on state, the battery control unit BCU controls the relay KA3 coil to lose power, and the normally open contact of the relay KA3 opens; the DC / DC power supply DY2 stops supplying power to the DC24V power supply terminal ID3 and switches back to power supply by the AC power on the grid side. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a flow chart of the emergency start-up method of the energy storage cabinet according to an embodiment of the present invention;

[0023] Figure 2This is a power supply circuit diagram of an energy storage cabinet according to an embodiment of the present invention;

[0024] Figure 3 This is an emergency start control circuit diagram of an energy storage cabinet according to an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the connection of DC24V electrical equipment in the energy storage cabinet according to an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the connection of the power indicator light of the energy storage cabinet according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] See also Figure 1-Figure 4 The present embodiment provides an emergency starting method for an energy storage cabinet. The energy storage cabinet is provided with a battery system, an energy storage converter PCS, a DC / DC power supply DY2 and a battery control unit BCU. The DC end of the energy storage converter PCS is connected to the battery system through a main control circuit, and the AC end of the energy storage converter PCS is connected to the AC power on the grid side through an AC isolation switch QF1. The output end of the AC isolation switch QF1 is connected to an AC power supply switch QF3, and the AC power supply switch QF3 is connected to auxiliary power equipment of the energy storage cabinet; a DC load switch QF2 and a normally open contact of a main contactor are arranged in series on the main control circuit; the input end of the DC / DC power supply DY2 is connected to the DC load switch QF2 of the main control circuit, and the normally open contact of the relay KA3 is connected in parallel with the normally open contact of the start button AN and then connected to the output end and DC24V power supply terminal ID3; DC24V power supply terminal ID3 supplies power to the battery control unit BCU and the DC24V electrical equipment of the energy storage cabinet. The DC24V electrical equipment of the energy storage cabinet includes I / O modules, industrial computers and switches; the battery control unit BCU is connected to the coil of the main contactor to control the power on and off of the main contactor coil to control the on and off of the main control circuit. The main contactor includes the main positive contactor KM1 and the main negative contactor KM2; the battery control unit BCU is connected to the relay KA3 coil to control the on and off of the normally open contact of the relay KA3; the battery control unit BCU is connected to the normally open contact of the start button AN to obtain the state of the start button AN; the battery control unit BCU is connected to the normally open contact of the DC load switch QF2 to obtain the state of the DC load switch QF2; the emergency starting method of the energy storage cabinet includes:

[0029] S101: Confirm that the AC power supply switch QF3 is in the open state, confirm that the DC load switch QF2 is in the closed state, and the DC / DC power supply DY2 is connected to the battery system to be powered and work;

[0030] S102: Press the start button AN, the DC / DC power supply DY2 is connected to the DC24V power supply terminal ID3 to supply power to the battery control unit BCU;

[0031] S103: The battery control unit BCU detects that the normally open contact of the start button AN is closed, and the battery control unit BCU obtains the battery system status and confirms that the battery system is in an available state;

[0032] S104: The battery control unit BCU controls the relay KA3 coil to be energized, the normally open contact of the relay KA3 is closed, and the DC / DC power supply DY2 is stably connected to the DC24V power supply terminal ID3 to supply power to the battery control unit BCU and the DC24V electrical equipment. At this time, the start button AN can be released;

[0033] S105: The battery control unit BCU controls the coils of the main positive contactor KM1 and the main negative contactor KM2 to be energized, so that the normally open contacts of the main positive contactor KM1 and the main negative contactor KM2 are closed, the main control circuit is in a connected state, and the battery system in the energy storage cabinet supplies power to the energy storage inverter PCS. The energy storage inverter PCS starts to convert DC power into AC power to supply power to the AC power load.

[0034] In some embodiments, when the AC power on the grid side is out of power, the AC power supply switch QF3 is manually disconnected. When the AC power on the grid side is restored, the AC power supply switch QF3 is manually closed. The power supply and power outage status of the AC power on the grid side are confirmed by the closing and disconnection of the normally open contacts of the AC power supply switch QF3.

[0035] In some embodiments, when the normally open contact of the AC power supply switch QF3 is in a closed state, the battery control unit BCU controls the relay KA3 coil to lose power, the normally open contact of the relay KA3 opens, the DC / DC power supply DY2 stops supplying power to the DC24V power supply terminal ID3, and returns to power supply by the AC power on the grid side.

[0036] In some embodiments, the DC24V power supply terminal ID3 is simultaneously connected to the output end of the BMS control power supply DY1, and the input end of the BMS control power supply DY1 is connected to the power supply circuit of the power grid cabinet UPS through the power switch QF5. When the grid-side AC power is supplied, the grid-side AC power is connected to the power supply circuit of the power grid cabinet UPS, and the DC24V power supply terminal ID3 is powered by the BMS control power supply DY1.

[0037] In some embodiments, the main control circuit includes main control input connectors B+ and B-, main control output connectors P+ and P-, the main control input connector B+, fuse FU, DC load switch QF2, the normally open contact of the main positive contactor KM1 and the main control output connector P+ are connected in sequence; the main control input connector B-, DC load switch QF2, current sensor, the normally open contact of the main negative contactor KM2 and the main control output connector P- are connected in sequence; the battery control unit BCU obtains the battery system status including: the battery control unit BCU is connected to the current sensor to collect the current value of the main control circuit as the current value of the battery system, and the battery control unit BCU is connected to the main control circuit to collect the voltage value of the main control circuit as the voltage value of the battery system; the battery control unit BCU collects the current value and voltage value of the battery system and calculates the battery system status. When the available power SOC of the single cell of the battery system is ≥5% and the minimum voltage is ≥2.6V, the battery system is deemed to be in an available state; when the available power SOC of the single cell of the battery system is ≤5% or the minimum voltage is ≤2.6V, the battery system is deemed to be in an unavailable state.

[0038] In some embodiments, when the battery system is in an unavailable state, the battery control unit BCU controls the relay KA3 coil to lose power, the normally open contact of the relay KA3 opens, and the DC / DC power supply DY2 stops supplying power to the DC24V power supply terminal ID3.

[0039] In some embodiments, the battery control unit BCU is connected to the fire sprinkler device to obtain the status of the fire sprinkler device. When the fire sprinkler device is in the on state, the battery control unit BCU controls the relay KA3 coil to lose power, the normally open contact of the relay KA3 opens, and the DC / DC power supply DY2 stops supplying power to the DC24V power supply terminal ID3.

[0040] When AC power is supplied from the grid side, the AC isolation switch QF1, DC load switch QF2, AC power switch QF3 and power switch QF5 are all in the closed state; the AC power from the grid side is connected to the power supply circuit of the power cabinet UPS, and supplies power to the DC24V power supply terminal ID3 through the BMS control power supply DY1, and then supplies power to the battery control unit BCU and DC24V electrical equipment. The battery control unit BCU controls the coils of the main positive contactor KM1 and the main negative contactor KM2 to be energized, so that the normally open contacts of the main positive contactor KM1 and the main negative contactor KM2 are closed, and the main control circuit is in the connected state. At this time, the AC power from the grid side supplies power to the energy storage inverter PCS, and the energy storage inverter PCS starts to convert AC power into DC power to charge the battery system.

[0041] When the AC power supply on the grid side just stops, the UPS power supply connected to the UPS power supply circuit of the grid cabinet can supply power to the DC24V power supply terminal ID3 through the BMS control power supply DY1 in a short time. Since the UPS power supply has limited power and short power supply time, during this power supply time, operate the start button AN for emergency start, and power it through the battery system, which can realize non-stop emergency start when the AC power supply on the grid side stops.

[0042] In some embodiments, the energy storage cabinet further includes status indicator lights, which include a fault indicator light HR and an operation indicator light HG. The battery control unit BCU is connected to and controls the fault indicator light HR and the operation indicator light HG to indicate the status of the battery control unit BCU.

[0043] In some embodiments, the battery control unit BCU is connected to the normally open contact of the intermediate relay KA1, and the coil of the intermediate relay KA1 is energized or de-energized by the normally open contact of the AC power switch QF3; that is, the battery control unit BCU confirms the opening or closing state of the AC power switch QF3 by the open or closed state of the normally open contact of the intermediate relay KA1; the energy storage cabinet also includes a power indicator light HW, and the power indicator light HW is energized or de-energized by the normally open contact of the relay KA3 and the normally open contact of the intermediate relay KA1 in parallel, that is, the power indicator light HW lights up when the AC power switch QF3 is closed or the relay KA3 is energized.

[0044] In summary, the energy storage cabinet emergency start method provided by the present invention is provided with a DC / DC power supply DY2 connected to the battery system of the energy storage cabinet; the connection and disconnection of the DC / DC power supply DY2 and the DC24V power supply terminal ID3 are controlled by the start button AN and the relay KA3. When the AC power on the grid side is cut off, the start button AN is pressed, and the DC / DC power supply DY2 is connected to the DC24V power supply terminal ID3 to supply power to the battery control unit BCU. The battery control unit BCU detects that the normally open contact of the start button AN is closed, controls the coil of the relay KA3 to be energized, and the DC / DC power supply DY2 supplies power to the battery control unit BC U and DC24V electrical equipment are supplied with stable power; the industrial computer and switch of the energy storage cabinet are powered on and work, and maintain the connection with the host computer; at the same time, the battery control unit BCU obtains the battery system status and confirms that the battery system is in an available state, then controls the coils of the main positive contactor KM1 and the main negative contactor KM2 to be energized, so that the normally open contacts of the main positive contactor KM1 and the main negative contactor KM2 are closed, and the main control circuit is in a connected state. At this time, the battery system in the energy storage cabinet supplies power to the energy storage inverter PCS, and the energy storage inverter PCS starts to convert DC power into AC power to supply power to the AC power load, thereby realizing the emergency start of the energy storage cabinet.

[0045] Furthermore, when the AC power on the grid side is restored, the battery system is in an unavailable state, or the fire sprinkler device is in an on state, the battery control unit BCU controls the relay KA3 coil to lose power, and the normally open contact of the relay KA3 opens; the DC / DC power supply DY2 stops supplying power to the DC24V power supply terminal ID3 and switches back to power supply by the AC power on the grid side.

[0046] Although the specific embodiments of the present invention are described above, those skilled in the art should understand that these are only examples, and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. An emergency starting method for an energy storage cabinet, characterized in that: The energy storage cabinet is provided with a battery system, an energy storage converter PCS, a DC / DC power supply DY2 and a battery control unit BCU. The DC end of the energy storage converter PCS is connected to the battery system through a main control circuit, and the AC end of the energy storage converter PCS is connected to the AC power on the grid side through an AC isolating switch QF1. The output end of the AC isolating switch QF1 is connected to an AC power supply switch QF3, and the AC power supply switch QF3 is connected to the auxiliary power equipment of the energy storage cabinet; a DC load switch QF2 and a normally open contact of a main contactor are arranged in series on the main control circuit; the input end of the DC / DC power supply DY2 is connected to the DC load switch QF2 of the main control circuit, and the relay KA3 The normally open contact of the start button AN is connected in parallel with the output end of the DC / DC power supply DY2 and the DC24V power supply terminal ID3; the DC24V power supply terminal ID3 supplies power to the battery control unit BCU and the DC24V power equipment of the energy storage cabinet. The DC24V power equipment of the energy storage cabinet includes an I / O module, an industrial computer and a switch; the battery control unit BCU is connected to the coil of the main contactor to control the power on and off of the main contactor coil to control the on and off of the main control circuit. The main contactor includes a main positive contactor KM1 and a main negative contactor KM2; the battery control unit BCU is connected to the relay KA3 coil to control the on and off of the normally open contact of the relay KA3; The battery control unit BCU is connected to the normally open contact of the start button AN to obtain the state of the start button AN; the battery control unit BCU is connected to the normally open contact of the DC load switch QF2 to obtain the state of the DC load switch QF2; The emergency start-up methods of the energy storage cabinet include: Confirm that the AC power switch QF3 is in the open state, confirm that the DC load switch QF2 is in the closed state, and the DC / DC power supply DY2 is connected to the battery system to be powered and work; Press the start button AN, the DC / DC power supply DY2 connects to the DC24V power supply terminal ID3 to supply power to the battery control unit BCU; The battery control unit BCU detects that the normally open contact of the start button AN is closed, and the battery control unit BCU obtains the battery system status and confirms that the battery system is in an available state; The battery control unit BCU controls the relay KA3 coil to be energized, the normally open contact of the relay KA3 is closed, and the DC / DC power supply DY2 is stably connected to the DC24V power supply terminal ID3 to supply power to the battery control unit BCU and the DC24V electrical equipment, and the start button AN can be released at this time; The battery control unit BCU controls the coils of the main positive contactor KM1 and the main negative contactor KM2 to be energized, so that the normally open contacts of the main positive contactor KM1 and the main negative contactor KM2 are closed, the main control circuit is in a connected state, and the battery system in the energy storage cabinet supplies power to the energy storage inverter PCS, and the energy storage inverter PCS starts to convert DC power into AC power to supply power to the AC power load.

2. The energy storage cabinet emergency start-up method according to claim 1, characterized in that: When the AC power on the grid side is out of power, the AC power supply switch QF3 is manually disconnected. When the AC power on the grid side is restored, the AC power supply switch QF3 is manually closed. The power supply and power outage status of the AC power on the grid side are confirmed by the closing and disconnection of the normally open contacts of the AC power supply switch QF3.

3. The energy storage cabinet emergency start-up method according to claim 2, characterized in that: When the normally open contact of the AC power supply switch QF3 is in a closed state, the battery control unit BCU controls the relay KA3 coil to lose power, the normally open contact of the relay KA3 opens, and the DC / DC power supply DY2 stops supplying power to the DC24V power supply terminal ID3 and returns to being powered by the AC power on the grid side.

4. The energy storage cabinet emergency start-up method according to claim 3, characterized in that: The DC24V power supply terminal ID3 is also connected to the output end of the BMS control power supply DY1, and the input end of the BMS control power supply DY1 is connected to the power supply circuit of the power grid cabinet UPS through the power switch QF5. When the grid-side AC power is supplied, the grid-side AC power is connected to the power supply circuit of the power grid cabinet UPS, and the DC24V power supply terminal ID3 is powered by the BMS control power supply DY1.

5. The energy storage cabinet emergency start-up method according to claim 1, characterized in that: The main control circuit includes main control input connectors B+ and B-, main control output connectors P+ and P-, the main control input connector B+, fuse FU, DC load switch QF2, the normally open contact of the main positive contactor KM1 and the main control output connector P+ are connected in sequence; the main control input connector B-, the DC load switch QF2, the current sensor, the normally open contact of the main negative contactor KM2 and the main control output connector P- are connected in sequence; The battery control unit BCU acquires the battery system state including: the battery control unit BCU connects to the current sensor to collect the current value of the main control circuit as the current value of the battery system, and the battery control unit BCU connects to the main control circuit to collect the voltage value of the main control circuit as the voltage value of the battery system; The battery control unit BCU collects the current value and voltage value of the battery system and calculates the battery system status. When the available power SOC of the single cell of the battery system is ≥5% and the minimum voltage is ≥2.6V, the battery system is considered to be in an available state; when the available power SOC of the single cell of the battery system is ≤5% or the minimum voltage is ≤2.6V, the battery system is considered to be in an unusable state.

6. The energy storage cabinet emergency start method according to claim 4, characterized in that: When the battery system is in an unavailable state, the battery control unit BCU controls the relay KA3 coil to lose power, the normally open contact of the relay KA3 opens, and the DC / DC power supply DY2 stops supplying power to the DC24V power supply terminal ID3.

7. The energy storage cabinet emergency start-up method according to claim 1, characterized in that: The battery control unit BCU is connected to the fire sprinkler device to obtain the status of the fire sprinkler device. When the fire sprinkler device is in the on state, the battery control unit BCU controls the relay KA3 coil to lose power, the normally open contact of the relay KA3 opens, and the DC / DC power supply DY2 stops supplying power to the DC24V power supply terminal ID3.

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