Flexible power battery whole-pack echelon utilization energy storage system

Abstract

The invention discloses a whole-pack echelon utilization energy storage system for flexible power batteries. The system comprises a battery compartment and an equipment compartment, a plurality of echelon battery packs are arranged in the battery compartment, each echelon battery pack comprises a power battery and a battery management unit, and an energy management unit, an energy storage converter and a plurality of DC / DC modules are arranged in the equipment compartment; the power battery is connected with a power grid and a load through the DC / DC module and the energy storage converter; the battery management unit obtains parameter information of the power battery and sends the parameter information to the energy management unit, and the energy management unit obtains the parameter information of the power battery, working parameters of the energy storage converter and working parameters of the DC / DC module and conducts energy management on the power battery according to the obtained parameters. According to the invention, the operation of the energy storage cabinet is carried out by using the whole pack of the existing batteries, the energy storage cabinet is compatible with different models and specifications, including voltage inconsistency, signal inconsistency and protocol inconsistency, and the manpower cost and disassembly cost are greatly saved.

Description

Technical Field

[0001] The present invention belongs to the field of energy technology, and in particular relates to a flexible power battery whole package cascade utilization energy storage system. Background Art

[0002] The difficulties in using second-life batteries for energy storage are mainly in the following aspects:

[0003] Battery consistency issue: After long-term use, the performance and parameters of second-life batteries will vary greatly, resulting in a decrease in the consistency of the battery pack.

[0004] Difficulty in battery management: There are many types and quantities of second-life batteries, making management more difficult.

[0005] Battery safety issues: The safety of second-life batteries may be affected after long-term use.

[0006] Patent CN110299733 B discloses an integrated power battery pack, energy storage system and method for energy storage using a second-life battery pack. The energy storage system includes a plurality of second-life battery packs connected in parallel. The second-life battery pack is an integrated power battery pack that is directly used, which can increase the flexibility of reuse, increase the design flexibility of the energy storage system, and meet the different needs of different customers. This patent solution only solves the problem of second-life battery consistency, and does not reasonably solve the battery management and battery safety problems, and it is difficult to ensure long-term stable operation. Summary of the invention

[0007] The purpose of the present invention is to solve the deficiencies of the above-mentioned background technology and to provide a flexible power battery whole package cascade utilization energy storage system.

[0008] The technical solution adopted by the present invention is: a flexible power battery whole pack cascade utilization energy storage system, including a battery compartment and an equipment compartment, wherein the battery compartment is provided with a plurality of cascade battery whole packs, wherein the cascade battery whole packs include power batteries and a battery management unit, wherein the equipment compartment is provided with an energy management unit, an energy storage converter and a plurality of DC / DC modules, wherein the plurality of power batteries are respectively connected to a plurality of DC / DC modules, and the plurality of DC / DC modules are connected to the energy storage converter via a DC bus;

[0009] The power battery is connected to the power grid and the load through the DC / DC module and the energy storage converter. The power battery supplies power to the load through the DC / DC module and the energy storage converter in turn, and the power grid charges the power battery through the energy storage converter and the DC / DC module in turn.

[0010] The battery management unit obtains parameter information of the power battery and sends it to the energy management unit. The energy management unit obtains parameter information of the power battery, operating parameters of the energy storage converter, and operating parameters of the DC / DC module, and performs energy management on the power battery according to the obtained parameters.

[0011] Furthermore, the whole package of secondary batteries is provided with a high voltage interface, a voltage interface and a CAN interface.

[0012] Furthermore, a plurality of data conversion modules are provided in the battery compartment, and the data conversion modules are used to realize data conversion between the battery management unit and the DC / DC module and the energy management unit.

[0013] Furthermore, the battery compartment is also provided with a plurality of temperature detection devices, a plurality of lifting and puncturing mechanisms and a first fire-fighting pipe, the plurality of temperature detection devices respectively detect the temperature of a plurality of echelon battery packs, the lifting and puncturing mechanisms are in contact with the outer shell of the echelon battery pack, the lifting and puncturing mechanism control end is connected with the control end of the fire control system, when the fire control system controls the lifting and puncturing mechanism to puncture the outer shell of the echelon battery pack, the first fire-fighting pipe is connected with the inside of the echelon battery pack;

[0014] The equipment compartment is also provided with fire-fighting equipment and a fire-fighting control system. The fire-fighting equipment is connected to the first fire-fighting pipe via a second fire-fighting pipe. The fire-fighting control system is used to determine whether to control the fire-fighting equipment to start for fire-fighting according to the temperature of the entire pack of used batteries.

[0015] Furthermore, the fire-fighting equipment includes a first device, a second device and a third device, and a first valve, a second valve and a third valve are respectively provided on the second fire-fighting pipe connected to the first device, the second device and the third device, and the control end of the fire-fighting control system is respectively connected to the control ends of the first valve, the second valve and the third valve.

[0016] Furthermore, the lifting and puncturing mechanism includes a connecting pipe, a driving device and a puncturing tube, one end of the connecting pipe is in contact with the outer shell of the whole battery pack, the connecting pipe is connected to a first fire-fighting pipe, one end of the puncturing tube passes through the connecting pipe and the other end is located inside the connecting pipe, and the other end of the puncturing tube is connected to the driving device. When the driving device is working, the puncturing tube is driven to move forward in the connecting pipe to puncture the outer shell of the whole battery pack, and the first fire-fighting pipe is connected to the inside of the whole battery pack through the connecting pipe.

[0017] Furthermore, two compartments are provided in the equipment cabin, the fire-fighting equipment and the fire-fighting control system are arranged in one of the compartments, and the energy management unit, the energy storage converter and several DC / DC modules are arranged in the other compartment.

[0018] Further, judging whether to control the fire fighting equipment to start fire fighting according to the temperature of the whole pack of used batteries includes:

[0019] Real-time detection of the temperature of the entire battery pack.

[0020] When the temperature of the whole pack of used batteries meets the first set condition, the lifting and puncturing mechanism is controlled to puncture the outer shell of the whole pack of used batteries; at the same time, the fire fighting equipment is controlled to start to carry out the first level fire fighting;

[0021] After the first level firefighting is over, if the temperature of the entire battery pack continues to rise after the second set time and the rising rate is greater than the second set rate, the firefighting equipment is controlled to start the second level firefighting;

[0022] After the second-level firefighting is over, if the temperature of the entire battery pack continues to rise after the third set time and the rising rate is greater than the third set rate, the fire-fighting equipment is controlled to start the third-level firefighting.

[0023] Furthermore, the first set condition includes: the temperature of the whole pack of used batteries is greater than the set temperature, the rate of increase of the temperature of the whole pack of used batteries is greater than a first set rate, and the duration is greater than a first set time.

[0024] Furthermore, a plurality of partitions are provided in the battery compartment, and the plurality of secondary battery packs are respectively arranged in the plurality of partitions.

[0025] The beneficial effects of the present invention are:

[0026] In the present invention, each battery pack is respectively equipped with a DC / DC module, which is compatible with battery packs of different voltage levels and effectively solves the problem of voltage inconsistency of different battery packs.

[0027] The present invention utilizes the original vehicle chassis battery as a second-life battery pack, performs various battery managements through the existing BMS built into the battery, and cooperates with the EMS for unified management to achieve fine control of single battery cells.

[0028] In the present invention, each battery pack is equipped with a data conversion module to realize the conversion of the interface and protocol between the power battery and the EMS. It can be compatible with the communication of different battery packs, solve the problems of inconsistency of communication protocols and interface inconsistency, and avoid frequent replacement of the EMS system.

[0029] The present invention utilizes the existing battery pack to operate the energy storage cabinet, and is compatible with different models and specifications, including inconsistent voltages, signals and protocols, thereby greatly saving labor costs and disassembly costs.

[0030] The present invention arranges fire-fighting equipment, a lifting and puncturing mechanism, a fire-fighting control system and other equipment in the secondary battery energy storage system. Through the cooperation of various equipment, thermal runaway of the battery can be effectively prevented, thereby improving safety.

[0031] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A schematic diagram of the principle of the energy storage system equipment layout (battery control) of the present invention.

[0033] Figure 2 It is a flow diagram of energy and information of the energy storage system of the present invention.

[0034] Figure 3 A schematic diagram of the principle of the energy storage system equipment layout (fire control) of the present invention.

[0035] Figure 4 It is a schematic diagram of the lifting and piercing mechanism of the present invention.

[0036] In the figure, 1-container; 2-battery compartment; 3-equipment compartment; 4-second battery pack; 5-first fire-fighting pipe; 6-second fire-fighting pipe; 7-first valve; 8-second valve; 9-third valve; 10-storage tank; 11-liquid storage tank; 12-fire-fighting tank; 13-fire-fighting control system; 14-fire hydrant; 15-puncture tube; 16-driving equipment; 17-connecting tube; 18-external fire-fighting pipe; 19-ground. DETAILED DESCRIPTION

[0037] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] like Figure 1 , Figure 2 As shown, the present invention provides a flexible power battery whole package cascade utilization energy storage system, including a battery compartment 2 and an equipment compartment 3, wherein the battery compartment 2 is provided with a plurality of cascade battery whole packages 4, wherein the cascade battery whole packages 4 include power batteries and a battery management unit (BMS), and the equipment compartment 3 is provided with an energy management unit (EMS), a power storage converter (PCS) and a plurality of DC / DC modules, wherein the plurality of power batteries are respectively connected to the plurality of DC / DC modules, and the plurality of DC / DC modules are connected to the energy storage converter via a DC bus;

[0039] The power battery is connected to the power grid and the load through the DC / DC module and the energy storage converter. The power battery supplies power to the load through the DC / DC module and the energy storage converter in turn, and the power grid charges the power battery through the energy storage converter and the DC / DC module in turn.

[0040] The battery management unit (EMS) obtains parameter information of the power battery and sends it to the energy management unit (BMS). The energy management unit obtains parameter information of the power battery, operating parameters of the energy storage inverter, and operating parameters of the DC / DC module, and performs energy management on the power battery according to the obtained parameters.

[0041] The energy storage system of the present invention can utilize a whole package of second-life batteries to operate energy storage cabinets, and is compatible with different models and specifications, including inconsistent voltages, signals, and protocols, thereby greatly saving labor costs and disassembly costs.

[0042] It is understandable that the above-mentioned equipment compartment 3 and battery compartment 2 are integrated into a container 1, and the container 1 is arranged on the ground 19. To facilitate the structural layout, a plurality of compartments are provided in the battery compartment 2, and the plurality of compartments are stacked up and down, and the plurality of secondary battery packs 4 are respectively arranged in the plurality of compartments. A battery tray 22 is arranged in the compartment, and the secondary battery pack is placed on the battery tray 22. A fireproof and heat-insulating coating is provided at the bottom of the battery tray (i.e., the surface in contact with the secondary battery pack), and the material is a silica aerogel adhesive, which can withstand a temperature of more than 1000°C, and its function is to block the heat conduction of the upper and lower layers of batteries, resulting in heat spread of the upper and lower layers of batteries.

[0043] It should be noted that the present invention utilizes the original vehicle chassis battery as a whole pack of second-life batteries. The chassis battery is a lithium iron phosphate battery system with a single pack capacity of 43.2kWh, which can be used as a whole pack. Various battery managements are performed through the existing BMS built into the second-life battery whole pack, including status monitoring, protection, balancing, charging, communication and data management of the power battery. At the same time, in order to ensure the consistency of signals and protocols with the EMS, each second-life battery whole pack is configured with a data conversion module. The data conversion module selects the vehicle chassis conversion protocol (PMS) to realize data conversion and interface between the battery management unit and the DC / DC module and the energy management unit. All PMS are connected to the EMS for unified management to achieve fine control of single cells.

[0044] It can be understood that the energy topology of the above energy storage system is implemented using a two-stage structure topology of a DC / DC module and an energy storage converter PCS (DC / AC).

[0045] The voltage range of the above power battery is 250V-365V, and the rated voltage is 320V. It is boosted to 640V by the DC / DC module to meet the PCS input voltage range. The DC / AC module of the PCS outputs 380V, 50HZ AC power that meets the grid access to achieve the discharge function. The DC / DC module can receive an input voltage of 100V-800V, which is compatible with most of the currently retired battery modules, and has a wide range of compatibility.

[0046] At the same time, the above PCS and DC / DC modules are both bidirectional modules. When the power battery needs to be charged, the PCS converts the 380V AC power of the power grid into 640V DC power, which is then converted by the DC / DC module into the 365V DC power required by the power battery to charge the power battery. The output voltage range of the DC / DC module is 100-800V, which is compatible with the charging needs of most of the currently retired battery modules and has a wide range of compatibility.

[0047] It can be understood that the topology of the present invention uses the chassis battery of a new energy vehicle as a whole pack of secondary batteries, and the whole pack of secondary batteries is provided with a high voltage interface 20, a voltage interface 21 and a CAN interface (not shown in the figure). In the form of not disassembling, the high and low voltages are transmitted to the DC / DC module and PMS through the connector through the high and low voltage interfaces respectively; at the same time, the 12V power supply is provided to the BMS through the power module. Since the original battery high and low voltage interfaces and the BMS management system are used, unpacking is not required, which reduces the cost of secondary utilization of power batteries.

[0048] It should be noted that the above EMS realizes the protection, monitoring and control within the energy storage power supply system, accesses the user's online monitoring, and receives the battery management system BMS information to realize the charging, discharging and load control functions within the energy storage system. The present invention transmits each CAN signal of the power battery to the corresponding PMS through the CAN interface, and the PMS converts it into a 485 signal to communicate with the EMS, realizing the output and input of the signal, and meeting the requirements of monitoring and control.

[0049] It is understandable that in order to ensure the safety of the above energy storage system, corresponding fire-fighting facilities are arranged in the above battery compartment 2 and the equipment compartment 3, and a fire-proof and heat-insulating coating is provided on the surface of the entire battery pack, which can effectively prevent thermal runaway of the battery. Figure 3As shown, the fire-fighting facilities include several temperature detection devices (not shown in the figure), several lifting and puncturing mechanisms and the first fire-fighting pipe 5 arranged in the battery compartment 2, and the fire-fighting equipment and fire-fighting control system 10 arranged in the equipment compartment 3. The temperature detection device is a temperature sensor, which is installed in a whole package of tiered batteries. In order to ensure the safety of the system and facilitate inspection and maintenance, two compartments are set in the equipment compartment. The fire-fighting equipment and fire-fighting control system are arranged in one compartment, and the energy management unit, energy storage converter and several DC / DC modules are arranged in the other compartment.

[0050] Among them, the several temperature detection devices respectively detect the temperatures of several recycled battery packs, the lifting and puncturing mechanism is in contact with the outer shell of the recycled battery pack, and the control end of the lifting and puncturing mechanism is connected to the control end of the fire control system. When the fire control system controls the lifting and puncturing mechanism to puncture the outer shell of the recycled battery pack, the first fire protection pipe 5 is connected to the inside of the corresponding recycled battery pack 4; the fire protection equipment is connected to the first fire protection pipe 5 through the second fire protection pipe 6, and the fire protection control system is used to determine whether to control the fire protection equipment to start for fire protection according to the temperature of the recycled battery pack.

[0051] It can be understood that the fire-fighting equipment includes a first device 11, a second device 12 and a third device 13, and the second fire-fighting pipe 6 connected to the first device 10, the second device 11 and the third device 12 is respectively provided with a first valve 7, a second valve 8 and a third valve 9, and the control end of the fire-fighting control system 10 is respectively connected to the control ends of the first valve 7, the second valve 8 and the third valve 9.

[0052] It should be noted that the first device 11 is a storage tank storing a fire extinguishing agent, and the fire extinguishing agent is heptafluoropropane; the second device 12 is a storage tank storing a fire fighting fluid, and the fire fighting fluid is a mixed solution of water and ethylene glycol; the third device 13 is a fire fighting tank connected to an external fire hydrant 14 through an external fire fighting pipe 18.

[0053] In the above scheme, if Figure 4As shown, the lifting and puncturing mechanism includes a connecting pipe 17, a driving device 16 and a puncturing tube 15. The puncturing tube 15 is a hard alloy steel pipe. The driving device 16 selects a hydraulic driving device, which is composed of a hydraulic pump, a hydraulic cylinder, a control valve and auxiliary equipment. One end of the connecting pipe 17 is in contact with the outer shell of the cascade battery pack 4, and the connecting pipe 17 is connected to the first fire-fighting pipe 5. One end of the puncturing tube 15 passes through the connecting pipe 17 and the other end is located inside the connecting pipe. The other end of the puncturing tube 15 is connected to the driving device 16. When the driving device 16 is working, the puncturing tube 15 is driven to advance a distance in the connecting pipe 17 to puncture the outer shell of the cascade battery pack 4. The first fire-fighting pipe 5 is connected to the inside of the cascade battery pack 4 through the connecting pipe 17. The present invention arranges a lifting and puncturing mechanism on the surface of each whole battery pack. When the corresponding single battery pack has thermal runaway, the lifting mechanism will be activated, and the carbide steel pipe will be ejected from the cylinder to puncture the battery cover. The inner pipe of the steel pipe will spray perfluorohexanone into the battery pack, thereby achieving the fire extinguishing at the battery pack cluster level. Since the battery pack is destroyed only after thermal runaway occurs, it does not need to be destroyed during use, and other uses of the battery pack are not affected.

[0054] Furthermore, judging whether to control the fire-fighting equipment to start fire-fighting according to the temperature of the whole pack of used batteries includes:

[0055] The temperature detection equipment detects the temperature of the entire battery pack in real time and sends it to the fire control system, which determines the temperature of the entire battery pack.

[0056] When the temperature of the whole pack of used batteries meets the first set condition, the lifting and puncturing mechanism is controlled to puncture the outer shell of the whole pack of used batteries; at the same time, the fire-fighting equipment is controlled to start to perform the first-level fire-fighting; the first-level fire-fighting is to control the first valve of the fire-fighting equipment 7 to open, keep the second valve 8 and the third valve 9 closed, and the first equipment 11 sprays the fire-extinguishing agent through the second fire-fighting pipe 6 and the first fire-fighting pipe 5 to reach the whole pack of used batteries 4 to extinguish the fire and reduce the temperature.

[0057] After the first level firefighting is over, if the temperature of the whole battery pack continues to rise after the second set time and the rising rate is greater than the second set rate, the firefighting equipment is controlled to start the second level firefighting; the second level firefighting is to control the second valve 8 of the firefighting equipment to open, keep the first valve 7 and the third valve 9 closed, and the second equipment 12 sprays the firefighting liquid through the second firefighting pipe 6 and the first firefighting pipe 5 to reach the whole battery pack 4 to extinguish the fire and cool down.

[0058] After the second-level firefighting is over, if the temperature of the entire battery pack continues to rise after the third set time and the rising rate is greater than the third set rate, the fire-fighting equipment is controlled to start the third-level fire-fighting; the third-level fire-fighting is to control the third valve 9 of the fire-fighting equipment to open, keep the first valve 7 and the second valve 8 closed, open the fire hydrant 14, and the third equipment 13 sprays fire-fighting water through the second fire-fighting pipe 6 and the first fire-fighting pipe 5 to reach the entire battery pack for fire extinguishing and cooling.

[0059] It should be noted that the first setting condition includes: the temperature of the whole pack of echelon batteries is greater than the set temperature, the temperature rise rate (temperature rise) of the whole pack of echelon batteries is greater than the first set rate, and the duration is greater than the first set time. Among them, the first set time, the second set time, the third set time, the first set rate, the second set rate, and the third set rate are all calibrated according to actual needs.

[0060] In some embodiments, after thermal runaway occurs, the following three levels of fire protection are implemented according to the highest temperature of the entire battery pack:

[0061] 1. Level 1 fire fighting: When the highest temperature of the whole pack of recycled batteries is greater than 60°C and the temperature rise is greater than 2°C / min, and the condition is not eliminated after repeated confirmation within 2 seconds, it is determined that thermal runaway has occurred. At this time, the first valve 7 is opened, the second valve 8 and the third valve 9 are closed, and the driving device 16 is started at the same time, and the puncture tube 15 is controlled to move forward 4mm to puncture the outer shell of the whole pack of recycled batteries 4, and the first device 11 sprays the fire extinguishing agent heptafluoropropane.

[0062] 2. Secondary fire fighting: After 5 minutes, the temperature of the entire battery pack continues to rise, and the temperature rise is greater than 1°C / min. The first valve 7 and the third valve 9 are closed, the second valve 8 is opened, and the second device 12 sprays fire fighting liquid (a mixed solution of water and ethylene glycol) to submerge the battery cluster.

[0063] 3. Level 3 fire fighting: After 30 minutes, the temperature of the whole battery pack continues to rise, and the temperature rise is greater than 1°C / min. Close the first valve 7 and the second valve 8, open the third valve 9, open the external fire hydrant 14, and flood the battery compartment. At this time, due to the effect of the high-temperature gas in the compartment, the ice in the fire fighting pipe has been eliminated, and the fire fighting water can play a good role. If the fire fighting water continues to freeze, it can be connected to the fire fighting water of the fire fighting truck.

[0064] It should be noted that, when thermal runaway occurs, the present invention can prevent the spread of thermal runaway through three-level fire protection, effectively reducing the property losses caused by thermal runaway.

[0065] Level 1 firefighting: When a single battery pack experiences thermal runaway, the lifting and puncturing mechanism will be activated, and the carbide steel tube will be ejected by the hydraulic cylinder, puncturing the outer shell of the entire battery pack. The connecting pipe will spray perfluorohexanone into the entire battery pack, achieving the fire extinguishing level of the battery pack cluster. Since the entire battery pack is only destroyed by the lifting and puncturing mechanism after thermal runaway occurs, it does not need to be destroyed during use, and it does not affect other uses of the battery pack.

[0066] Secondary fire protection: immersion antifreeze. Antifreeze is a mixed solution of 55% ethylene glycol and 45% water. Its freezing point is -40°C. In most energy storage scenarios, it is difficult to freeze in winter. After thermal runaway occurs, after the first-level fire protection is completed, if the battery temperature still rises, the second-level fire protection is activated, and the original pipeline is used to fill the failed battery pack with antifreeze to quickly reduce the temperature of the thermal runaway battery and control the runaway battery cell.

[0067] Level 3 firefighting: After thermal runaway occurs, when the first and second level firefighting have taken effect and the on-site personnel arrive but the fire is still not under effective control, activate the third level firefighting and pour fire water into all battery packs to control the spread of the fire.

[0068] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field.

Claims

1. A flexible power battery whole package cascade utilization energy storage system, characterized by: It includes a battery compartment and an equipment compartment. The battery compartment is provided with a plurality of secondary battery packs, the secondary battery packs include power batteries and a battery management unit. The equipment compartment is provided with an energy management unit, an energy storage converter and a plurality of DC / DC modules. The plurality of power batteries are respectively connected to the plurality of DC / DC modules, and the plurality of DC / DC modules are connected to the energy storage converter via a DC bus. The power battery is connected to the power grid and the load through the DC / DC module and the energy storage converter. The power battery supplies power to the load through the DC / DC module and the energy storage converter in turn, and the power grid charges the power battery through the energy storage converter and the DC / DC module in turn. The battery management unit obtains parameter information of the power battery and sends it to the energy management unit. The energy management unit obtains parameter information of the power battery, operating parameters of the energy storage converter, and operating parameters of the DC / DC module, and performs energy management on the power battery according to the obtained parameters.

2. The flexible power battery whole package cascade utilization energy storage system according to claim 1 is characterized by: The whole package of secondary batteries is provided with a high voltage interface, a voltage interface and a CAN interface.

3. The flexible power battery whole package cascade utilization energy storage system according to claim 1 is characterized by: A plurality of data conversion modules are also arranged in the battery compartment, and the data conversion modules are used to realize data conversion between the battery management unit and the DC / DC module and the energy management unit.

4. The flexible power battery whole package cascade utilization energy storage system according to claim 1 is characterized in that: The battery compartment is also provided with a plurality of temperature detection devices, a plurality of lifting and puncturing mechanisms and a first fire-fighting pipe, wherein the plurality of temperature detection devices respectively detect the temperature of a plurality of echelon battery packs, the lifting and puncturing mechanisms are in contact with the outer shell of the echelon battery pack, and the control end of the lifting and puncturing mechanism is connected with the control end of the fire control system, and when the fire control system controls the lifting and puncturing mechanism to puncture the outer shell of the echelon battery pack, the first fire-fighting pipe is connected with the inside of the echelon battery pack; The equipment compartment is also provided with fire-fighting equipment and a fire-fighting control system. The fire-fighting equipment is connected to the first fire-fighting pipe via a second fire-fighting pipe. The fire-fighting control system is used to determine whether to control the fire-fighting equipment to start for fire-fighting according to the temperature of the entire pack of used batteries.

5. The flexible power battery whole package cascade utilization energy storage system according to claim 4 is characterized in that: The fire-fighting equipment includes a first device, a second device and a third device. A first valve, a second valve and a third valve are respectively provided on a second fire-fighting pipeline connected to the first device, the second device and the third device. The control end of the fire-fighting control system is respectively connected to the control ends of the first valve, the second valve and the third valve.

6. The flexible power battery whole package cascade utilization energy storage system according to claim 4 is characterized by: The lifting and puncturing mechanism includes a connecting pipe, a driving device and a puncturing tube. One end of the connecting pipe is in contact with the outer shell of the whole battery pack, and the connecting pipe is connected to the first fire-fighting pipe. One end of the puncturing tube passes through the connecting pipe and the other end is located inside the connecting pipe. The other end of the puncturing tube is connected to the driving device. When the driving device is working, the puncturing tube is driven to move forward in the connecting pipe to puncture the outer shell of the whole battery pack. The first fire-fighting pipe is connected to the inside of the whole battery pack through the connecting pipe.

7. The flexible power battery whole package cascade utilization energy storage system according to claim 4 is characterized by: Two compartments are arranged in the equipment cabin, the fire-fighting equipment and the fire-fighting control system are arranged in one of the compartments, and the energy management unit, the energy storage converter and a plurality of DC / DC modules are arranged in the other compartment.

8. The flexible power battery whole package cascade utilization energy storage system according to claim 4 is characterized by: The method of judging whether to control the fire fighting equipment to start fire fighting according to the temperature of the whole pack of used batteries includes: Real-time detection of the temperature of the entire battery pack; When the temperature of the whole pack of used batteries meets the first set condition, the lifting and puncturing mechanism is controlled to puncture the outer shell of the whole pack of used batteries; at the same time, the fire fighting equipment is controlled to start to carry out the first level fire fighting; After the first level firefighting is over, if the temperature of the entire battery pack continues to rise after the second set time and the rising rate is greater than the second set rate, the firefighting equipment is controlled to start the second level firefighting; After the second-level firefighting is over, if the temperature of the entire battery pack continues to rise after the third set time and the rising rate is greater than the third set rate, the fire-fighting equipment is controlled to start the third-level firefighting.

9. The flexible power battery whole package cascade utilization energy storage system according to claim 7 is characterized in that: The first set condition includes: the temperature of the whole pack of recycled batteries is greater than the set temperature, the temperature rise rate of the whole pack of recycled batteries is greater than the first set rate, and the duration is greater than the first set time.

10. The flexible power battery whole package cascade utilization energy storage system according to claim 1 is characterized in that: A plurality of partitions are arranged in the battery compartment, and the plurality of secondary battery packs are arranged in the plurality of partitions respectively.

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