Whole pack energy storage system and energy storage power station

Abstract

The invention relates to new energy, and provides a whole-pack energy storage system and an energy storage power station, and the system comprises an energy storage unit which comprises at least one path of original vehicle battery pack with a battery management system; the energy storage DC-DC converter is electrically connected with each path of original vehicle battery pack through the first switch unit; the energy storage converter comprises a direct current end and an alternating current end which are electrically connected with the at least one energy storage DC-DC converter; the AC bus is connected with an AC end and an external power grid; the energy management system is connected with the battery management system, the energy storage DC-DC converter and the energy storage converter unit so as to collect operation parameters and send a control instruction to control charging and discharging; wherein the energy management system is in communication connection with each battery management system through an adapter, and simulates a communication environment of an actual vehicle for an original vehicle battery pack so as to implement charging and discharging control. Therefore, the whole-pack energy storage system and the energy storage power station are constructed by using the redundant original vehicle battery packs, the problem of maintenance cost of the redundant original vehicle battery packs is solved, and new energy consumption and power supply guarantee are effectively supported.

Description

Technical Field

[0001] The present disclosure relates to the field of new energy technologies, and particularly to an integrated energy storage system and an energy storage power station. Background Art

[0002] An energy storage power station is a facility that can convert renewable energy (such as solar energy, wind energy, etc.) into electrical energy and store it for supplying power during peak demand periods or power system failures. The core function of an energy storage power station is to balance the supply-demand contradiction in the power system and improve the stability and reliability of the power system.

[0003] In a battery-based energy storage power station, the battery, as the core energy storage device, its own cost and the cost of control management (and corresponding R & D) are the primary considerations for building an energy storage power station. Summary of the Invention

[0004] In view of the above-mentioned disadvantages of the prior art, the purpose of the present disclosure is to provide an integrated energy storage system and an energy storage power station to solve the problems in the related technologies.

[0005] The first aspect of the present disclosure provides an integrated energy storage system, including: an energy storage unit, including at least one original vehicle battery pack for a new energy vehicle, and each original vehicle battery pack includes a battery management system; an energy storage conversion unit, including: at least one energy storage DC-DC converter, electrically connected to each of the original vehicle battery packs through a first switching unit; at least one energy storage inverter, including a DC terminal and an AC terminal electrically connected to the at least one energy storage DC-DC converter, for converting between DC voltage and AC voltage; an AC bus, electrically connected to the AC terminal and connected to an external power grid; the external power grid is connected to an external load that can be powered by the integrated energy storage system; an energy management system, communicatively connected to the battery management system, the energy storage DC-DC converter, and the energy storage conversion unit to collect their operating parameters and send control instructions to control the charge and discharge of the energy storage unit; wherein, the energy management system is communicatively connected to each of the battery management systems through each adapter that can transfer its preset communication interface to a CAN communication interface, and the energy management system simulates the communication environment of the original vehicle battery pack in an actual vehicle, so as to be able to obtain the battery operating parameters from the battery management system in real time and manipulate the energy storage conversion unit to perform the charge and discharge of the energy storage unit based on an energy scheduling strategy.

[0006] In an embodiment of the first aspect, the integrated energy storage system further includes: an auxiliary subsystem, including at least one of the following auxiliary functional units: a liquid-cooled air conditioner unit; a fire protection system; a lighting component; the liquid-cooled air conditioner unit is electrically connected to the AC busbar, communicatively coupled to the energy management system, outputs the operating parameters of the liquid-cooled air conditioner unit and receives control instructions; the fire protection system is electrically connected to the AC busbar, communicatively coupled to and controlled by the energy management system, outputs the operating parameters of the fire protection system and receives control instructions; the lighting component is electrically connected to the AC busbar.

[0007] In an embodiment of the first aspect, the operating parameters of the liquid-cooled air conditioner unit include at least one of the following: ambient temperature, flow rate, inlet and outlet temperature, alarm information; and / or, the operating parameters of the fire protection system include at least one of the following: alarm information, gas injection signal.

[0008] In an embodiment of the first aspect, the integrated energy storage system further includes: a safety switch control unit, communicatively connected between the energy management system and each switch unit, for transmitting the control signal of the energy management system to each switch unit; and for disconnecting a specified switch unit in response to detecting the failure of the energy management system.

[0009] In an embodiment of the first aspect, the integrated energy storage system further includes: a plurality of collectors, arranged in the connection to the AC busbar and each of its power supply branches, for collecting the power supply data of the AC busbar and its power supply branches; a data acquisition module, communicatively connected to the plurality of collectors and the energy management system, for collecting the power supply data and transmitting it to the energy management system.

[0010] In an embodiment of the first aspect, the integrated energy storage system further includes: an intelligent electricity meter unit, electrically connected to the AC busbar to collect power parameters, and communicatively connected to the energy management system to transmit the power parameter signals; the power parameters include at least one of the following: three-phase current, voltage, active and reactive power, electric energy and harmonics, the charging power of the external power grid to the integrated energy storage system, and the discharging power of the integrated energy storage system to the external power grid.

[0011] In an embodiment of the first aspect, the battery operating parameters of the energy storage unit include at least one of the following: cell voltage, cell current, cell temperature, busbar temperature, state of charge, health, adjustable depth of battery energy / power, fault level, high-voltage interlock information, communication status; and / or, the operating parameters of the energy storage converter unit include at least one of the following: DC voltage, DC current, DC power, AC voltage, AC current, internal temperature of the converter, clock, frequency, power factor, current input power, current output power, cumulative input power, cumulative output power.

[0012] In an embodiment of the first aspect, the energy management system is configured to control the charge and discharge of the energy storage unit based on an energy scheduling strategy; the energy scheduling strategy includes at least one of the following: 1) causing the energy storage unit to charge according to the valley and flat values of the local electricity price and discharge at peak times; 2) when the electricity consumption of the entire energy storage system in the power consumption scenario is restricted by the grid, causing the entire energy storage system to discharge according to the power requirement to be met in the power consumption scenario; and when the discharge power is greater than the load power of the external load in the power consumption scenario, restricting the reverse current output of the entire energy storage system to the upstream external power grid; 3) a transformer is provided in the AC bus or the line between the AC bus and the energy storage converter; the sum of the load powers of the loads connected to the output side of the transformer is less than the rated capacity of the transformer; 4) based on the set demand of the set power consumption scenario, restricting the power supply obtained by the entire energy storage system from the external power grid in the power consumption scenario to be lower than the difference between the set demand and the load power of the external load in the power consumption scenario; and when the load power of the external load is greater than the set demand, stopping the charging of the energy storage unit.

[0013] In an embodiment of the first aspect, the energy management system is communicatively connected to the cloud platform monitoring system to send the operation status data of the entire energy storage system to the cloud platform monitoring system for display; or, receive the user remote control instructions issued by the cloud platform monitoring system and execute the corresponding control actions.

[0014] In an embodiment of the first aspect, the data displayed by the cloud platform monitoring system includes at least one of the following: the battery operation parameters of the energy storage unit that change in real-time tracking; the operation parameters of the energy storage conversion unit; the management of the entire energy storage system; user management; alarm management; revenue management.

[0015] In an embodiment of the first aspect, the battery management system is configured to detect the operation parameters of each battery cell in the original vehicle battery pack and the battery pack temperature in real-time and transmit them to the energy management system and the energy storage converter in real-time to restrict each battery cell to be in a safe working state; the energy storage converter is configured to detect the operation parameters of the energy storage unit in real-time and restrict the energy storage unit to be in a safe working state within the safe working area; the energy management system is configured to detect the operation parameters of the battery management system and the energy storage converter in real-time, and based on the operation parameters transmitted by the battery management system and the energy storage converter, determine whether the entire energy storage system is operating in a normal state; if not, disconnect from the external power grid and perform at least one of the following: isolate the energy storage converter from the energy storage unit; isolate the battery packs in the energy storage unit from each other.

[0016] In an embodiment of the first aspect, the whole package energy storage system is configured in a box; the box includes a battery compartment and an electrical compartment, and is provided with a fire protection system; the energy storage unit, the multiple battery cells contained therein are stacked in the battery compartment; each battery cell includes one or more original vehicle battery packs; a fire detection alarm component includes a detection unit, an alarm unit and a fire control unit communicatively connected to the detection unit and the alarm unit; the detection unit includes: a bin-level detection component and a battery cell-level detection component; the bin-level detection component includes a preset number of temperature-sensing fire detectors, combustible gas detectors and smoke detectors; the battery cell-level detection component includes: a composite fire detector for detecting combustible gas and temperature set corresponding to each battery cell; a fire extinguishing component, which is communicatively connected to and controlled by the fire control unit, includes an exhaust unit, a fire extinguishing agent spraying component and a water injection component ; The exhaust unit connects the battery compartment to the outside world; the spray port of the fire extinguishing component is connected to the battery unit; the water outlet of the water injection component is connected to the battery compartment; wherein, the fire control unit responds to the first fire alarm signal of any one of the detectors in the warehouse-level detection component and the battery unit-level detection component, and activates the alarm unit to alarm; in case of a combustible gas fire, the exhaust unit is linked to exhaust to prevent explosion; the fire control unit responds to the second fire alarm signal of any two detectors belonging to the same protection zone, and links the fire extinguishing component to perform the fire extinguishing action after a preset delay; and after the fire extinguishing component is started, an alarm is issued through the alarm unit; after the fire control unit responds to the fire extinguishing action, according to the temperature data detected by the warehouse-level detection component or the battery unit-level detection component meeting the thermal runaway condition, the water injection component is started to inject water into the battery compartment.

[0017] In an embodiment of the first aspect, the fire extinguishing component includes: a fire extinguishing agent spraying device, a fire extinguishing agent main pipe connected to the fire extinguishing agent spraying device, and a fire extinguishing agent branch pipe connected to the fire extinguishing agent main pipe and arranged one by one for each battery unit; each fire extinguishing agent branch pipe is provided with a partition valve for controlling on / off; the fire control unit links the fire extinguishing component to perform a fire extinguishing action, including: in response to the detector that generates an alarm being a composite fire detector, turning on the partition valve of the fire extinguishing agent branch pipe corresponding to the battery unit of the composite fire detector to perform a fire extinguishing action on the corresponding battery unit.

[0018] A second aspect of the present disclosure provides an energy storage power station, comprising one or more complete energy storage systems as described in any one of the first aspects.

[0019] As described above, the present disclosure provides an integrated energy storage system and an energy storage power station. The system includes: an energy storage unit including at least one original vehicle battery pack with a battery management system; an energy storage DC-DC converter electrically connected to each original vehicle battery pack via a first switch unit; an energy storage inverter including a DC terminal and an AC terminal electrically connected to at least one energy storage DC-DC converter; an AC bus connecting the AC terminal to an external power grid; and an energy management system connected to the battery management system, the energy storage DC-DC converter, and the energy storage conversion unit to collect operating parameters and send control instructions to control charging and discharging. Among them, the energy management system is communicatively connected to each battery management system through an adapter to simulate the communication environment of the original vehicle battery pack in an actual vehicle to implement charging and discharging control. Thus, an integrated energy storage system and an energy storage power station are constructed using redundant original vehicle battery packs, solving the problem of the maintenance cost of redundant original vehicle battery packs and effectively supporting new energy consumption and power supply guarantee. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Show a schematic diagram of the electrical connection structure of the integrated energy storage system in an embodiment of the present disclosure.

[0021] Figure 2 Show a schematic diagram of the structure of the energy storage inverter in an embodiment of the present disclosure.

[0022] Figure 3 Show a schematic diagram of the communication connection structure between the energy management system and other components in an embodiment of the present disclosure.

[0023] Figure 4 Show a schematic diagram of the mechanical structure of the integrated energy storage system in an embodiment of the present disclosure.

[0024] Figure 5 Show a schematic diagram of the layout structure of the fire protection system of the integrated energy storage system in an embodiment of the present disclosure.

[0025] Figure 6 Show a schematic diagram of the structure of the fire protection control unit in an embodiment of the present disclosure.

[0026] Figure 7 Show a schematic diagram of the structure of the computer device in an embodiment of the present disclosure.

[0027] Figure 8 Show a schematic diagram of the power consumption scenario in an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the information disclosed herein. The present disclosure can also be implemented or applied in different specific embodiments, and various details in the present disclosure can also be modified or changed according to different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that, without conflict, the embodiments and features in the embodiments of the present disclosure can be combined with each other.

[0029] The following will refer to the accompanying drawings to elaborate on the embodiments of the present disclosure in detail, so that those skilled in the art to which the present disclosure pertains can easily implement it. The present disclosure can be embodied in many different forms and is not limited to the embodiments described herein.

[0030] In the description of the present disclosure, the reference terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials, or characteristics represented by combining with the embodiment or example are included in at least one embodiment or example of the present disclosure. Moreover, the specific features, structures, materials, or characteristics represented can be combined in a suitable manner in any one or a group of embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples represented in the present disclosure and the features of different embodiments or examples.

[0031] In addition, the terms "first" and "second" are only used for the purpose of indication and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of such features. In the description of the present disclosure, the meaning of "a group" is two or more, unless otherwise specifically defined.

[0032] To clearly illustrate the present disclosure, devices irrelevant to the description are omitted, and the same or similar components throughout the specification are given the same reference numerals.

[0033] Throughout the specification, when it is said that a device is "connected" to another device, this includes not only the case of "direct connection", but also the case of "indirect connection" with other elements placed therebetween. In addition, when it is said that a certain device "includes" a certain component, unless there is a particularly contrary record, it does not exclude other components, but means that other components can also be included.

[0034] Although in some examples the terms first, second, etc. are used herein to denote various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first interface and a second interface, etc. are indicated. Further, as used herein, the singular forms "a", "an", and "the" are also intended to include the plural forms unless the context indicates otherwise. It should be further understood that the terms "comprising", "including" indicate the presence of the stated features, steps, operations, elements, modules, items, kinds, and / or groups, but do not preclude the presence, occurrence, or addition of one or a group of other features, steps, operations, elements, modules, items, kinds, and / or groups. The terms "or" and "and / or" used herein are to be construed as inclusive, or meaning any one or any combination. Thus, "A, B, or C" or "A, B, and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B, and C". An exception to this definition occurs only when the combination of elements, functions, steps, or operations is inherently mutually exclusive in some manner.

[0035] The technical terms used herein are only for referring to specific embodiments and are not intended to limit the present disclosure. The singular forms used herein also include the plural forms as long as the statement does not clearly indicate the contrary meaning. The meaning of "including" used in the specification is to embody specific characteristics, regions, integers, steps, operations, elements, and / or components, and does not exclude the existence or addition of other characteristics, regions, integers, steps, operations, elements, and / or components.

[0036] Although not defined differently, including the technical terms and scientific terms used herein, all terms have the same meaning as generally understood by those skilled in the technical field to which the present disclosure pertains. Terms defined in commonly used dictionaries are additionally interpreted to have a meaning consistent with the relevant technical literature and the currently presented information. As long as they are not defined, they should not be over-interpreted as ideal or overly formulaic meanings.

[0037] In a battery-based energy storage power station, the battery, as the core energy storage device, its own cost and the cost of control management (and corresponding R & D) are the primary considerations for building an energy storage power station. If brand-new batteries are used for the energy storage power station, it will not only increase the battery cost and the cost of inviting battery manufacturers to rebuild the control management system (such as the energy management system EMS) or developing the control management system independently, but also be not conducive to environmental protection.

[0038] Considering that due to vehicle model iterations, the sales volume of the vehicle OEM is not as much as expected. For each vehicle model, there will be many spare battery packs and inventory battery packs. These battery packs require a high-standard warehouse and professional personnel for maintenance and charging. For the vehicle OEM, this is an additional cost. The purchase price of these battery packs is not cheap. If they are sold at a depreciation, there will be a large loss, which is not worth it.

[0039] In view of this, based on the requirements of this scenario, the applicant has developed an integrated energy storage system to extend the value of the entire life cycle of the battery pack.

[0040] In the embodiments of the present disclosure, an integrated energy storage system and an energy storage power station are provided. The integrated energy storage system can use original vehicle battery packs such as spare battery packs, inventory battery packs, old batteries, and even retired battery packs to construct energy storage units, utilize the additional batteries of the vehicle OEM, solve the maintenance cost problem of the additional battery packs of the vehicle OEM, and be more environmentally friendly. And through the provision of a cooperating energy management system to achieve charge and discharge control, so as to effectively store and release new energy, effectively support the consumption of new energy and power supply guarantee, killing multiple birds with one stone.

[0041] As Figure 1 shown, a schematic diagram of the electrical connection structure of the integrated energy storage system in the embodiments of the present disclosure is shown.

[0042] In Figure 1 it, the integrated energy storage system 100 includes: an energy storage unit 110, an energy storage converter unit 120, and an energy management system 130 (Energy Management System, EMS).

[0043] The energy storage unit 110 includes: at least one original vehicle battery pack 111 for new energy vehicles. As an example, the original vehicle battery pack 111 can be one or more of ternary lithium batteries, lithium iron phosphate batteries, sodium ion batteries, lead-acid batteries, solid-state batteries, etc. In some embodiments, the energy storage unit 110 includes multiple original vehicle battery packs 111, and the multiple original vehicle battery packs 111 can form one or more battery clusters. In some embodiments, each original vehicle battery pack 111 can be independently encapsulated. In some embodiments, each original vehicle battery pack 111 can include a battery management system 1111 (BMS).

[0044] The original vehicle battery pack 111 can be a spare battery pack, an inventory battery pack, an old battery, or even a retired battery pack, etc. (it can also be a brand-new battery pack), without any disassembly and without damaging the original structure. In some embodiments, the original vehicle battery pack 111 can integrate existing high-voltage distribution boxes, BMS, external connectors, liquid cooling plates, etc. By matching other units around the energy storage unit 110, the complete integrated energy storage system 100 can be constructed quickly, efficiently, and at low cost.

[0045] In some embodiments, the operating state of the battery in the energy storage working environment is much better than that in the actual operation of the vehicle, which can effectively extend the service life of the original vehicle battery pack 111. The common charge-discharge rate of a vehicle is 2C, that is, the ratio of the battery capacity to the charge-discharge current is 2. However, in the energy storage working environment, the maximum charge-discharge rate of the original vehicle battery pack 111 is not higher than 0.5C, far lower than 2C, and the operating environment temperature is stable, without vibrations and impacts caused by vehicle movement. Therefore, the old or retired original vehicle battery pack 111 can also have a long service life in the energy storage working environment. Therefore, in the embodiments of the present disclosure, using the old or retired original vehicle battery pack 111 to construct the integrated energy storage system 100 not only reduces costs but also has better service quality and reliability, with extremely high commercial value and environmental protection value.

[0046] In some embodiments, based on more stringent reference standards, batteries or retired batteries with better health states can be screened according to the State of Health (SoH) of the battery to construct the energy storage unit 110. For example, battery packs with an SoH of more than 90% are preferably selected to construct the energy storage unit 110.

[0047] In some embodiments, the inherent BMS of the original vehicle battery pack 111 may have functions such as measurement, fault alarm, protection, self-diagnosis, and equalization. In the embodiments of the present disclosure, a path for information and control instruction interaction can be established between the EMS and the BMS, so that these functions can be retained and play a role.

[0048] The energy storage converter unit 120 includes: an energy storage DC-DC converter 121 and an energy storage inverter 122 (Power Conversion System, PCS). Both the energy storage DC-DC converter 121 and the energy storage inverter 122 (Power Conversion System, PCS) are bidirectional to be suitable for the charging and discharging of the original vehicle battery pack 111.

[0049] In some embodiments, the energy storage DC-DC converter 121 corresponds to each original vehicle battery pack 111 one by one, and is respectively connected to each original vehicle battery pack 111. It is used to lead the output voltages of the positive and negative poles of each original vehicle battery pack 111 to the positive and negative lines of the DC bus respectively after DC-to-DC conversion. In some embodiments, a DC switch unit 140 is provided between each original vehicle battery pack 111 and the corresponding connected energy storage DC-DC converter 121. As an example, the DC switch unit 140 can be implemented as a DC circuit breaker. The DC switch unit 140 can automatically disconnect when the current in the line reaches a certain value, thereby forming protection. For example, it disconnects when the current flowing into or out of the original vehicle battery pack 111 is too large to protect the original vehicle battery pack 111 or the devices powered by the original vehicle battery pack 111. In some embodiments, the low-voltage side voltage of the energy storage DC-DC converter 121 (i.e., the side connected to the energy storage unit 110) is, for example, in the DC voltage range of 200V to 800V, and usually 400V can be selected. The lower limit of the low voltage can be extended, and the low-voltage side current is in the range of -125A to +125A. The high-voltage side voltage (i.e., the other side of the energy storage DC-DC converter 121) is, for example, in the DC voltage range of 650V to 880V, and the high-voltage side current is, for example, in the range of -75A to 75A. That is, during the charging of the energy storage unit 110, it may step down and charge from the high-voltage side to the low-voltage side, and during the discharging of the energy storage unit 110, the energy storage DC-DC converter 121 may boost the output voltage of the energy storage unit 110 and then output it. In some embodiments, the DC-DC has a communication port, such as CAN or RS485, etc., and can be communicatively connected to the outside to receive external control and output data.

[0050] In some embodiments, the energy storage inverter 122 includes a DC terminal and an AC terminal electrically connected to the at least one path of energy storage DC-DC converter 121, and is used for the conversion between DC voltage and AC voltage. In some embodiments, the energy storage inverter 122 can be implemented as a bidirectional inverter. When the energy storage unit 110 discharges, it can invert the output DC voltage of the energy storage unit 110 from the DC terminal into an AC voltage and output it at the AC terminal, or when the energy storage unit 110 charges, it can convert the input AC voltage from the AC terminal into a DC voltage and output it to the energy storage unit 110 at the DC terminal.

[0051] Figure 2Fig. schematically shows the structural diagram of the energy storage converter 122, including three pairs of connected transistors respectively connected to three-phase four-wire (three-phase lines A, B, C and neutral line N). Each pair of transistors includes Q1, Q2 (or Q6), Q3 (or Q5), and Q4. Taking Q1~Q6 as MOS transistors, where Q1 and Q2 (or Q6) are NMOS, their drains and sources are connected to each other to form a first connection point, and the first connection point is connected to one of A, B, C. Q3 and Q5 are PMOS and are connected in common drain with NMOS Q4. The source of Q4 is connected to the first connection point, and the sources of Q3 and Q5 are connected to the neutral line. It also includes capacitors C1, C2, C3. C1 and C2 are connected in series and in parallel with C3, and also in parallel with Q1 and Q2. The second connection point between C1 and C2 is connected to the N line. A bypass unit may be provided in the branch of C3. The bypass unit includes: a direct connection line with a first switching element; and a resistor branch connected in parallel with the direct connection line and connected in series with a second switching element and a resistor R. By switching the first switching element and the second switching element, it is possible to select to connect R to form an RC circuit, or bypass R.

[0052] In some embodiments, the energy storage converter 122 may include multiple PCS modules, and the output power of the energy storage converter 122 is the sum of the output powers of multiple PCS modules. For example, the energy storage converter 122 includes 5 PCS modules of 100KW, and the output power of the energy storage converter 122 is 500KW. In some embodiments, the energy storage converter 122 may have at least one of functions such as short-circuit protection, reverse polarity connection protection, DC over / under voltage protection, off-grid overcurrent protection, over-temperature protection, AC incoming line phase sequence error protection, communication fault protection, cooling system fault protection, anti-islanding protection, etc.

[0053] In a power grid grid-connection scenario, 380V low-voltage grid connection can be selected and connected to the user's 380V low-voltage power distribution cabinet. The energy storage unit 110 is connected to the DC bus 123 through each energy storage DC-DC converter 121 and then connected to the PCS. After the PCS converts the current, the output voltage is 380V, and then it is connected to the user's step-down 380V low-voltage bus through the low-voltage power distribution cabinet.

[0054] The whole-pack energy storage system 100 further includes an AC bus 160, which is electrically connected to the AC terminal of the energy storage converter 122 and connected to the external power grid; the external power grid is connected to an external load that can be powered by the whole-pack energy storage system. In some embodiments, the AC bus 160 can be connected to the external power grid through an AC switch unit 150 for controlling the connection and disconnection with the external power grid. The AC switch unit 150 can be implemented as an AC circuit breaker, which disconnects the connection between the AC bus 160 and the external power grid when the current / voltage reaches the disconnection standard to form protection. In some embodiments, an AC switch unit 150 can also be provided for each power supply branch line connecting each electrical device (such as a liquid-cooled air-conditioning unit 180, a fire protection system 190, a lighting component 1000, an EMS, and other controllers, etc.) in each whole-pack energy storage system 100, and it can be implemented as an AC circuit breaker to protect each electrical device.

[0055] As Figure 8 shown, the external power grid can provide a main circuit, and various loads can be connected in parallel to the main circuit to obtain power supply. The loads can include the whole-pack energy storage system 100 and other external loads 200. In a certain power consumption scenario, such as in a factory of a certain user, it includes external loads such as various industrial devices and the whole-pack energy storage system 100. When connected to the external power grid in parallel, the industrial devices and the whole-pack energy storage system 100 can obtain power supply, and the whole-pack energy storage system 100 can be charged. Alternatively, the whole-pack energy storage system 100 can also discharge to supply power to the industrial devices in this power consumption scenario.

[0056] Returning to Figure 1 , in some embodiments, the energy storage conversion unit 120 can further include a transformer 1020, which is connected between the energy storage converter 122 and the AC bus 160 and is used to transform the AC voltage required for mutual transfer between the energy storage converter 122 and the AC bus 160 to the required voltage value.

[0057] It should be particularly noted that although the structure of the energy storage conversion unit 120 shown in the illustrated embodiment is that each original vehicle battery pack 111 is respectively connected to the DC bus 123 (bus bar) through its corresponding energy storage DC-DC converter 121, and after being collected by the DC bus 123, it is connected to one energy storage converter 122. However, in other embodiments, the structure of the energy storage conversion unit 120 can also be that each original vehicle battery pack is connected in parallel to the AC bus through an energy storage DC-DC converter 121 and an energy storage converter 122 respectively to form a collection on the AC bus, and this structure of the energy storage conversion unit 120 also belongs to the protection scope of the present application.

[0058] The energy management system 130 is communicatively connected to the battery management system 1111 and the energy storage converter unit 120 to collect their operating parameters and send control instructions to control the charging and discharging of the energy storage unit 110. Among them, the energy management system 130 is communicatively connected to each battery management system 1111 through each adapter that can transfer its preset communication interface (such as an Ethernet interface or a USB interface) to a CAN communication interface. The adapter can be, for example, a CANFD device that converts an Ethernet port to a CAN interface. As an example, the energy management system 130 can obtain more output interfaces through an Ethernet gateway device to communicate with other devices respectively.

[0059] Reference can be made to Figure 3 shown in the schematic diagram of the communication connection structure between the energy management system 130 and other components.

[0060] In Figure 3 , the energy management system 130 is configured as an entity device with multiple Ethernet ports, communicatively connected to the outside through the Ethernet ports, and communicating with other components through the TCP / IP protocol. Specifically, the energy management system 130 includes a first Ethernet port, which is connected to the fifth Ethernet port of the first gateway T1 through the first Ethernet port. The first gateway T1 can be implemented as a switch. The sixth Ethernet port, the seventh Ethernet port, and the eighth Ethernet port of the first gateway T1 are respectively communicatively connected to the BMSs of multiple original vehicle battery packs through CANFD devices T1, T2, and T3.

[0061] The energy management system 130 can also be communicatively connected to the energy storage converter 122 through the ninth Ethernet port on the first gateway T1. In addition, the energy management system 130 can also be communicatively connected to the energy storage DC-DC converter 121 through other Ethernet ports on the first gateway T1 or other Ethernet ports of itself. Alternatively, the communication interface of the energy storage DC-DC converter 121 can also be communicatively connected to other communication interfaces (such as a USB interface) of the energy management system 130 after being converted by a converter. The above implementation methods can be relatively flexible and are not limited.

[0062] Optionally, the tenth Ethernet port on the first gateway T1 can be connected to a water-cooled air-conditioning unit, and the eleventh Ethernet port on the first gateway can be connected to a PLC. Optionally, the second Ethernet port of the EMS can be connected to the second gateway T5, and the second gateway T5 can be implemented as a router. The router can be a wired or wireless router for communicating with a remote end through an external Internet. Optionally, the remote end can be implemented as a cloud platform monitoring system 200.

[0063] To obtain battery operation parameters from the battery management system 1111 of the original vehicle battery pack 111 for monitoring and to perform charge and discharge control on the battery management system 1111, the energy management system 130 can run a program to simulate the communication environment of the original vehicle battery pack 111 in the actual vehicle, so as to be able to obtain battery operation parameters from the battery management system 1111 in real time and manipulate the energy storage converter unit to perform charge and discharge on the energy storage unit based on the energy scheduling strategy. Specifically, the energy management system 130 has the logical simulation function of the vehicle ECU node, thereby simulating the communication environment in which the original vehicle battery pack 111 is still operating in the real vehicle environment without modifying the software of the original vehicle battery pack 111.

[0064] For example, simulate the vehicle CAN bus communication environment required by the BMS, capture the CAN bus communication data generated during the communication process of the original vehicle battery pack 111, and use the vehicle CAN bus communication environment to simulate the message information sent by the nodes in the vehicle to the BMS, control the BMS to enter various working conditions, and respond to the messages sent by the BMS. In some embodiments, the energy management system can communicate with the vehicle BMS and control charge and discharge by importing the original vehicle BMS DBC file to meet the energy scheduling strategy set by the system.

[0065] In an alternative embodiment, the energy management system 130 can be disposed in a control cabinet, and the control cabinet may include components such as an industrial computer, a programmable logic controller 1010 (PLC), an uninterruptible power supply (UPS), gateway devices (routers, switches), a display screen, etc.

[0066] In some embodiments, the UPS can be connected to the AC bus 160 and can supply power to the EMS, BMS, and fire protection components, ensuring that the EMS, BMS, and fire protection system 190 can operate normally for no less than a preset duration, such as 30 minutes to 60 minutes, in the event of a power outage.

[0067] In some embodiments, the software system running in the energy management system 130 can be developed based on a mature and stable development system (such as CentOS based on Linux, etc., but not limited to this), and can make full use of the software ecology of the development system. In some embodiments, the software system of the energy management system 130 can integrate a Javascript interpreter and UI rendering to support rapid updates of software logic and algorithms. After the mutual verification of the hardware of the programmable logic controller 1010, the energy management system 130 can still be controlled by the programmable logic controller 1010 to shut down the equipment after the system crashes and the communication fails. For example, each DC switch unit 140 and AC switch unit 150 can be turned on / off by the energy management system 130 through the programmable logic controller 1010 in addition to being turned off according to the abnormal voltage and current in the line. Then, when the energy management system 130 fails, the programmable logic controller 1010 can turn off the specified AC switch unit 150 to power off the corresponding device, thereby ensuring system safety.

[0068] The energy management system 130 can communicate with the original battery pack BMS via CANFD, and has the function of importing and editing the CAN DBC file of the original vehicle BMS. Therefore, all battery operating parameters sent by the BMS of the original vehicle battery pack 111 can be read, including at least one of the cell temperature, cell voltage, cell current, bus temperature, state of charge, health, battery energy / power adjustable depth, fault level, high-voltage interlock information, and communication status, so as to realize the real-time monitoring function of the original vehicle battery pack 111. Through the logic algorithm, the main relay in the original vehicle battery pack 111 can be controlled to realize the charging and discharging function of the original vehicle battery pack 111.

[0069] In some embodiments, the energy management system 130 acquires the operating parameters of the energy storage conversion unit 120 by communicating with the energy storage conversion unit 120. The operating parameters of the energy storage conversion unit 120 include at least one of the following: DC voltage, DC current, DC power, AC voltage, AC current, temperature inside the converter, clock, frequency, power factor, current input power, current output power, cumulative input power, and cumulative output power.

[0070] In some embodiments, the energy management system 130 has a battery doctor algorithm that can predict the trend of various parameters of the battery cell according to the change of the health of the battery cell. For example, the speed of deterioration of the health of the battery cell can be determined according to the maximum capacity and the speed of change of the slope of the health decline.

[0071] In some embodiments, in order to expand the types of supported BMSs, the EMS may also reserve an extended communication interface for data intercommunication with the EMS monitoring systems of other vehicle manufacturers, such as an extended communication interface supporting multiple communication protocols such as MODBUS, DL / T 860, DL / T 634.5104, and DL / T 634.5101.

[0072] In some embodiments, as Figure 1 and Figure 3 shown, the integrated energy storage system 100 may further include a smart meter unit 170, electrically connected to the AC bus 160 to collect power parameters, and communicatively connected to the energy management system 130 to transmit the power parameter signals. In Figure 3 an example, the smart meter unit 170 may be directly connected to a communication interface of the EMS, such as an RS485 interface. In some embodiments, in some embodiments, the smart meter unit 170 may use a two-way high-precision smart meter, which can measure all common power parameters, such as three-phase current, voltage, active and reactive power, electric energy, harmonics, the charging power of the external power grid to the integrated energy storage system 100, and the discharging power of the integrated energy storage system 100 to the external power grid. It also has a perfect communication function to communicate with the EMS. In some embodiments, the smart meter unit 170 may have a display interface, which can display the charging power of the energy storage system by the external power grid and the discharging power of the energy storage system to the external power grid.

[0073] Optionally, the integrated energy storage system 100 may further include an auxiliary subsystem, and the auxiliary subsystem may include at least one auxiliary function unit. The auxiliary function unit may be, for example, a liquid-cooled air-conditioning unit 180, a fire protection system 190, and a lighting component 1000.

[0074] The liquid-cooled air-conditioning unit 180 is electrically connected to the AC bus 160 to obtain power supply, and is communicatively coupled to the energy management system 130, outputting the operating parameters of the liquid-cooled air-conditioning unit 180 and receiving control instructions. In some embodiments, the operating parameters of the liquid-cooled air-conditioning unit 180 include at least one of the following: ambient temperature, flow rate, inlet and outlet temperature, and alarm information.

[0075] In some embodiments, the liquid-cooled air-conditioning unit 180 includes a liquid chiller and an external pipeline system. As an example, the liquid chiller mainly includes three major modules: a refrigeration circuit, a coolant circuit, and an electric control system. The refrigeration circuit mainly includes components such as a compressor, a fan, a condenser, a plate heat exchanger, a throttle valve, a high-pressure detector, and a high-low pressure switch. The coolant circuit consists of components such as a water pump, a water tank, a flow detector, and a heat-sensitive fire detector. The coolant can be water or other types of coolants, not limited to water. The electric control system mainly includes a controller, a frequency converter, a circuit breaker, a contactor, a relay, etc. As an example, the external pipeline system mainly includes connecting pipelines, fan coils, and a water distribution component, where the water distribution component may include a ball valve, an automatic air vent valve, and connecting pipelines, etc. This external pipeline system can achieve functional matching with the liquid chiller to meet the thermal management requirements of the original vehicle battery pack 111 in the energy storage unit 110.

[0076] During the temperature regulation process, the refrigeration circuit and the coolant circuit exchange heat through the plate heat exchanger to keep the temperature of the water tank within the set temperature range. The water pump supplies the coolant to the original vehicle battery pack 111 and the fan coil, while meeting the control of the temperature of the original vehicle battery pack 111 and the ambient temperature to operate within a suitable temperature range.

[0077] When the integrated energy storage system 100 is in operation, the temperature of the battery cells can be controlled within 25°C ± 3°C. In addition, the temperature of the integrated energy storage system 100 can be adjusted by the coil fan. Optionally, the coil fan also has a dehumidification function.

[0078] The integrated energy storage system 100 is usually placed outdoors and can be set in a box 300, such as a container. Therefore, the working environment is often relatively harsh. Thus, the liquid-cooled air-conditioning unit 180 can have both refrigeration and heating functions to adjust the working temperature of the original vehicle battery pack 111. Through the refrigeration function of the liquid-cooled air-conditioning unit 180, the original vehicle battery pack 111 can be effectively cooled, and problems such as thermal runaway, serious attenuation of battery capacity, and attenuation of product life caused by excessive temperature of the original vehicle battery pack 111 in the container during charge and discharge can be effectively solved. In addition, through the heating function of the liquid-cooled air-conditioning unit 180, the problem that the original vehicle battery pack 111 cannot start in cold regions can be effectively solved, ensuring the normal start of the original vehicle battery pack 111 and enabling the original vehicle battery pack 111 to operate efficiently within a suitable temperature range. At the same time, the problem of too low temperature in the container in winter can also be effectively solved.

[0079] In some embodiments, the fire protection system 190 is electrically connected to the AC bus 160 to obtain power supply, communicatively coupled to and controlled by the energy management system 130, and outputs the operating parameters of the fire protection system 190 and receives control instructions. In some embodiments, the fire protection system 190 may perform one or more fire protection actions such as fire alarm, exhaust explosion protection, fire extinguishing agent spraying, and even water flooding fire extinguishing. The operating parameters of the fire protection system 190 may include at least one of the following: alarm information, gas injection signal.

[0080] In some embodiments, the lighting assembly 1000 is electrically connected to the AC bus 160 to obtain power supply. The lighting assembly 1000 may include one or more of lighting fixtures, indicator lights, etc.

[0081] In some embodiments, the integrated energy storage system 100 further includes a plurality of collectors (not shown) and a data acquisition module (not shown). The plurality of collectors are respectively disposed in the connection to the AC bus 160 and each of its power supply branches for collecting power supply data of the AC bus 160 and its power supply branches, such as voltage, current, etc. The power supply branches may include power supply branches connecting each auxiliary function unit and the energy storage converter 122. In some embodiments, an AC switch unit 150 may be respectively disposed in each power supply branch and the AC bus 160, and the AC switch unit 150 may be implemented as an AC circuit breaker, etc. The data acquisition module is communicatively connected to the plurality of collectors and the energy management system 130 for collecting the power supply data and transmitting it to the energy management system 130.

[0082] In Figure 1 In the embodiments, the energy management system 130 may also be used to control the charge and discharge of the energy storage unit 110 based on an energy scheduling strategy. The energy scheduling strategy includes at least one of the following: peak shaving and valley filling, anti-counterflow and limited power support, transformer capacity protection, setting demand protection, etc.

[0083] Peak shaving and valley filling means that the energy storage unit 110 is charged according to the valley and flat values of the local electricity price and discharges at the peak. Specifically, it charges and discharges according to the set time, discharges during the set peak electricity price period, and charges during the valley and flat electricity price periods.

[0084] Anti-backflow and power limit support means that when the power consumption of the power grid is restricted in the power consumption scenario, the energy storage unit 110 is made to discharge according to the power requirement that the external load connected in parallel with the entire energy storage system 100 in the power consumption scenario needs to meet. Moreover, when the discharge power of the entire energy storage system 100 is greater than the load power of the external load, the backflow of the entire energy storage system 100 to the external power grid is restricted. Specifically, when power is restricted in the power consumption scenario (i.e., the power grid restricts the power consumption of electrical equipment), according to the power requirement, the energy storage unit 110 is made to discharge according to the power load. The entire energy storage system 100 does not discharge upstream of the grid connection point with the external power grid. An electricity meter with communication capabilities and capable of sending active power can be set on the total incoming line side of the grid connection point.

[0085] Transformer capacity protection. A transformer is provided in the AC bus or the line between the AC bus and the energy storage converter; the sum of the load powers of the loads connected to the output side of the transformer is less than the rated capacity of the transformer. For example, in Figure 1 the embodiment, the energy storage converter 122 can be electrically connected to the AC bus 160 through a transformer 1020; when the energy storage unit 110 is charging, the output side of the transformer 1020 is the first side connected to the energy storage conversion unit 120, and the connected loads are internal loads such as the energy storage conversion unit 120 and the energy storage unit 110, then the sum of the charging powers of each energy storage unit 110 is restricted to be less than the rated capacity of the transformer 1020. Also, when the energy storage unit 110 discharges and is connected to the external power grid, the output side of the transformer 1020 is the second side connected to the AC bus, the connected loads are internal loads such as the liquid-cooled air-conditioning unit 180, and in the grid-connected mode, it also includes external loads in the external power grid, then the sum of the load powers of the connected internal loads, or the internal loads and external loads, can be restricted to be less than the rated capacity of the transformer 1020, thereby protecting the transformer. The energy management system 120 can track the load power of the entire energy storage system 100 through communication with the transformer 1020 or through the data acquisition module to obtain the real-time load power.

[0086] In another embodiment, the transformer can also be provided in the AC bus 160, for example, located between the grid connection point of the AC bus 160 with the external power grid and the connection points of each auxiliary function unit (such as Figure 1 at position B in ), then when the entire energy storage system is powered by the external power grid input, the output side of the transformer is the side for each auxiliary function unit, the energy storage unit 110 and other internal loads, and the sum of the load powers of each internal load is restricted to be less than the rated capacity of the transformer.

[0087] Set demand protection refers to restricting the power supply (i.e., charging) obtained by the entire energy storage system 100 in the power consumption scenario to be lower than the difference between the set demand and the load power of the external load in the power consumption scenario based on the set demand of the set power consumption scenario. And when the load power of the external load is greater than the set demand, charging of the energy storage unit 110 is stopped to ensure the power supply of the external load in the power consumption scenario. The EMS can track the load power output by the entire energy storage system to the external power grid.

[0088] It can be understood that the power regulation and output in the above energy scheduling strategy can be achieved by the energy management system 130 controlling and regulating the output power of the energy storage inverter unit 120.

[0089] Through the battery management system 1111, the energy storage inverter 122, and the energy management system 130, it is possible to monitor whether the multi-level working states of the object from small to large are safe. Specifically, the battery management system 1111 is used to detect the operating parameters of each battery cell in the original vehicle battery pack and the battery pack temperature in real time and transmit them to the energy management system 130 and the energy storage inverter 122 in real time to limit each battery cell to be in a safe working state. That is, the BMS can monitor and control the safe working state of the battery cells in real time. For another example, the energy storage inverter 122 is used to detect the operating parameters of the energy storage unit 110 in real time and limit the energy storage unit to be in a safe working state within the safe working area. That is, the PCS can monitor and control the safe working state of the energy storage unit 110 in real time. For another example, the energy management system 130 is used to detect the operating parameters of the battery management system 1111 and the energy storage inverter 122 in real time, and judge whether the entire energy storage system is operating in a normal state according to the operating parameters transmitted by the battery management system 1111 and the energy storage inverter 122; if not, it is disconnected from the external power grid, the energy storage inverter 122 is isolated from the energy storage unit, and the battery packs in the energy storage unit 110 are isolated from each other. That is, the EMS can monitor and control the safe working state of the entire energy storage system 100 in real time.

[0090] In some embodiments, the energy management system 130 is communicatively connected to the cloud platform monitoring system 200, and the communication connection method is as Figure 3 shown, to send the operation status data of the entire energy storage system 100 to the cloud platform monitoring system 200 for display. The energy management system 130 can also receive the user remote control instructions issued by the cloud platform monitoring system 200 and execute the corresponding control actions. In some embodiments, the data displayed by the cloud platform monitoring system 200 includes at least one of the following: the battery operation parameters of the energy storage unit 110 that change in real time; the operation parameters of the energy storage inverter unit 120; the management of the entire energy storage system 100; user management; alarm management; revenue management.

[0091] In an alternative example, the cloud platform monitoring system 200 has a remote terminal monitoring function (which can be a fixed terminal or a mobile terminal), can have a friendly human-machine operation interface, and can be connected to a display or a large screen for demonstration. The cloud platform monitoring system 200 can detect and remotely control the operation of the energy storage system in real time, set operation strategies (such as the above-mentioned energy scheduling strategy, fire protection strategy, etc.), can also study distributed data acquisition technology, and integrate communications of multiple systems and multiple protocols. In some examples, all data on the EMS can be sent to the remote cloud platform monitoring system 200 through a wireless router via the TCP / IP protocol, and the online detection function and remote monitoring function of the entire energy storage system 100 can be realized through the cloud platform detection system by terminals such as mobile terminals (such as mobile phones) and computers.

[0092] In an alternative example, the user can view the operation parameters of the energy storage unit 110 through the cloud platform monitoring system 200, such as cell voltage, temperature, current, SOC, SOH, and the adjustable depth of the energy / power of the battery system. For another example, the battery status display: communication status, main relay status, SOC, SOH, fault level, high-voltage interlock information. In an alternative example, the user can view the operation parameters of the energy storage converter unit 120, such as DC voltage, DC current, DC power, AC voltage, AC current, converter internal temperature, clock, frequency, power factor, current output (input) power, cumulative input power, cumulative output power, etc.

[0093] The operation state and operation mode of the battery energy storage system, such as data display and acquisition, uploading, can be set and adjusted through the cloud platform monitoring system 200.

[0094] As Figure 4 shown, a schematic diagram of the mechanical structure of the entire energy storage system 100 in the embodiment of the present disclosure is shown.

[0095] In Figure 4 it, the entire energy storage system 100 is configured in a box body 300, and the box body 300 can be implemented as a container. To facilitate observing the internal equipment distribution of the box body 300, Figure 4Part of the side plate of the box body 300 is omitted. The box body 300 includes a battery compartment 310 and an electrical compartment 320. A plurality of battery units 112 included in the energy storage unit 110 are stacked in the battery compartment 310. Each battery unit 112 includes one or more original vehicle battery packs 111. The plurality of battery units 112 in the energy storage unit 110 can be stacked into one or more columns, such as the two columns shown in the figure. The energy storage DC-DC converter 121, the energy storage inverter unit 120, the AC bus 160, the energy management system 130, etc. are arranged in the electrical compartment 320. As an example, a power distribution cabinet can be arranged in the electrical compartment 320, and the AC bus 160, the power supply branches connecting each auxiliary function unit, the EMS, etc., and each AC switch unit 150 in the AC bus 160 and the power supply branches can be arranged in the power distribution cabinet. As an example, the intelligent electricity meter unit can be in the power distribution cabinet. A control cabinet can be set up and powered by one power supply branch. The energy management system 130, the first gateway (T1), the router (T5), etc. and their power supply circuits are arranged in the control cabinet. The power supply circuit can be a switching power supply for converting the AC voltage (such as 220V) provided by the power supply branch into a working voltage suitable for the control cabinet (such as 12V, 24V, etc.). As an example, the liquid-cooled air conditioner unit 180 can also be arranged in the electrical compartment 320.

[0096] As Figure 5 shown, a schematic layout diagram of the fire protection system in an embodiment of the present disclosure is shown.

[0097] The box body 300 is provided with a fire protection system 190. The fire protection system 190 includes a fire detection and alarm component 191 and a fire extinguishing component 192. Specifically, the fire detection and alarm component 191 includes a detection unit 1911, an alarm unit 1912, and a fire control unit 1913 communicatively connected to the detection unit 1911 and the alarm unit 1912.

[0098] In some embodiments, the alarm unit 1912 may include at least one of an in-station audible and visual alarm, a gas release alarm (which can also be an indicator light), a bell, etc. installed on the box body 300. Optionally, the alarm unit 1912 may further include an audible and visual alarm, a gas release alarm, etc. located outside the box body 300 for alarm prompts. The alarm unit 1912 can be controlled by the fire control unit 1913 to give an alarm, or can be connected with a manual alarm button for users to give an alarm manually.

[0099] In some embodiments, the detection unit 1911 includes a bin-level detection component and a battery unit-level detection component. The battery unit-level detection component includes a composite fire detector 19111 for detecting combustible gas and temperature corresponding to each battery unit 112. As an example, the composite fire detector 19111 can be disposed on each battery unit 112, for example, on the surface of the battery unit 112.

[0100] The bin-level detection component includes a preset number of heat detectors 19112, combustible gas detectors 19113, and smoke detectors 19114. Each detector in the bin-level detection component can be distributed in the battery bin 310 or the battery bin 310 and the electrical bin 320, and can be disposed at the top. In Figure 5 the embodiment, the bin-level detection component can include a group of two heat detectors 19112, which are disposed in a side area at the top of the battery bin 310. A group of heat detectors 19112 and smoke detectors 19114 are disposed at the top of the other side area. A combustible gas detector 19113 is disposed at the top between the two side areas. The combustible gas detector 19113 can be a composite gas detector for detecting hydrogen (H2) and carbon monoxide (CO). Optionally, a group of heat detectors 19112 and smoke detectors 19114 can also be disposed at the top of the electrical bin 320 to detect a fire spreading to the electrical bin 320.

[0101] The fire extinguishing component 192 is communicatively connected to and controlled by the fire control unit 1913 to perform a fire extinguishing action under the control of the fire control unit 1913. In some embodiments, the fire extinguishing component 192 includes an exhaust unit 1921, a fire extinguishing agent spraying component 1922, and a water injection component 1923.

[0102] The exhaust unit 1921 communicates the battery bin 310 with the outside world and is used to exhaust the battery bin 310 to prevent explosion. In some embodiments, the exhaust unit 1921 can include a fan, and an air inlet and an air outlet (which can also include a set of louvers) disposed on the side wall of the box body 300 and communicating with the battery bin 310. The fan can be disposed in the flow channel between the air inlet and the air outlet, for example, at the air outlet. The exhaust unit 1921 can be connected to and controlled by the fire control unit 1913. Optionally, the fan can also have a manual switch for the fan, which allows the user to manually start and stop the fan.

[0103] The spraying port of the fire extinguishing agent spraying component 1922 communicates with the battery unit 112. In Figure 5In the embodiment, it is shown that the fire extinguishing agent spraying assembly 1922 includes a fire extinguishing agent spraying device 19221, a main fire extinguishing agent pipe 19222, and each fire extinguishing agent branch pipe 19223. Optionally, the fire extinguishing agent spraying device 19221 may be arranged at a position adjacent to the battery compartment 310 in the electrical compartment 320. The fire extinguishing agent in the fire extinguishing agent spraying device 19221 may be perfluorohexanone. Compared with heptafluoropropane, perfluorohexanone has a higher insulation strength, and after extinguishing an open fire, the local and total flooding concentrations can be maintained by intermittently spraying perfluorohexanone, which is beneficial to suppressing battery thermal runaway, and thus realizing continuous suppression of re-ignition. Perfluorohexanone is a liquid at room temperature and can be safely transported and stored in ordinary containers under normal pressure, which can meet the performance requirements of the regulation recommendation to separately configure a fire extinguishing medium nozzle for each battery cell 112. Perfluorohexanone has a zero ODP (ozone depletion potential value), a low GWP, and an atmospheric residence time of 5 days, and is an excellent green environmental protection refrigerant, and is expected to replace other traditional fire extinguishing media such as heptafluoropropane. The main fire extinguishing agent pipe 19222 is connected to the fire extinguishing agent spraying device 19221 and extends to the top of the battery compartment 310. Subsequently, the main fire extinguishing agent pipe 19222 extends downward from the position corresponding to each column of battery cells 112 at the top of the battery compartment 310 to extend out fire extinguishing agent branch pipes 19223 corresponding to each battery cell 112. A partition valve 19224 is connected in each fire extinguishing agent branch pipe 19223 for controlling the on-off of the fire extinguishing agent branch pipe 19223 where it is located, so as to control the spraying or stopping of the fire extinguishing agent by the fire extinguishing agent branch pipe 19223 to the corresponding battery cell 112. The partition valve 19224 can be controlled by the fire control unit 1913.

[0104] The water outlet of the water injection assembly 1923 is connected to the battery compartment 310. In Figure 5 it is shown that the water injection assembly 1923 includes a water injection pipe 19231. The water injection pipe 19231 extends from outside the battery compartment 310 through a hole in the wall of the battery compartment 310 to the inside of the battery compartment 310, and is arranged such that its water outlet is close to the top and is located above each battery cell 112. A valve is provided outside the battery compartment 310 on the water injection pipe 19231, such as an electric ball valve 19232 that can be manually and electrically controlled, etc., for controlling the water injection pipe 19231 to inject water into the battery compartment 310 for water immersion fire extinguishing. The electric ball valve 19232 can be controlled by the fire control unit 1913. The water inlet of the water injection pipe 19231 outside the battery compartment 310 can be connected to a fire water source through a fire water pipe, such as a fire hydrant, etc. In some embodiments, the box body 300 can be arranged close to the fire water source for easy water injection. When the gas fire extinguishing cannot control the spread of thermal runaway, the whole compartment will be filled with fire water, and the original battery pack 111 with thermal runaway will be immersed in water to quickly control the fire.

[0105] In some embodiments, the fire control unit 1913 may have a fire protection strategy to judge the severity of a fire alarm according to the detection data of the detection unit 1911, so as to perform corresponding alarms through the alarm unit 1912, and may select to activate the exhaust unit 1921, the fire extinguishing agent spraying component 1922, and the water injection component 1923 in the fire extinguishing component 192 according to the severity.

[0106] In some embodiments, as Figure 6 shown, the fire control unit 1913 may include a gas fire extinguishing controller 19131 and a water injection fire extinguishing controller 19132. The fan of the exhaust unit 1921 includes a fan controller, and the gas fire extinguishing controller 19131 is connected to and controls the fan controller to control the start and stop of the exhaust unit 1921. The gas fire extinguishing controller 19131 is connected to and controls the alarm unit 1912, and the gas fire extinguishing controller 19131 is connected to and controls the opening and closing of the zoning valve and the start and stop of the fire extinguishing agent spraying device 19221. The water injection fire extinguishing controller 19132 is communicatively connected to the gas fire extinguishing controller 19131, and the water injection fire extinguishing controller 19132 is connected to and controls the opening and closing of the electric ball valve 19232.

[0107] The fire protection strategy of the fire control unit 1913 in the embodiments of the present disclosure may determine the severity of a fire alarm according to the following logic.

[0108] First, the fire control unit 1913 responds to the first fire alarm signal of any one of the detectors in the bin-level detection component and the battery unit-level detection component, and activates the alarm unit 1912 to give an alarm. Specifically, when any detector of the detection unit 1911 (which may be a detector of the bin-level detection component or a detector of the battery unit-level detection component) detects data anomalies or a manual fire alarm button, the first fire alarm signal is output and reported to the fire control unit 1913 (for example, reported to the gas fire extinguishing controller 19131). If it is a combustible gas alarm (such as when the concentration of combustible gas reaches the threshold), the exhaust unit 1921 can be used to exhaust the gas to prevent explosion.

[0109] The fire control unit 1913 responds to the second fire alarm signal of any two detectors belonging to the same protection zone, and links the fire extinguishing component 192 to perform the fire extinguishing action after a preset delay. The protection zone of the gas fire extinguishing system refers to a limited space that meets the requirements of the full flooding gas fire extinguishing system. Specifically, after receiving the second linkage trigger signal, a second alarm signal indicating a serious fire alarm is formed and reported to the gas fire extinguishing controller 19131. The linkage trigger signal refers to the alarm signal of the detector belonging to the same protection zone as the detector that forms the first level alarm. When the fire control unit 1913 receives the second alarm signal, the delayed start of the fire extinguishing device is controlled (for example, spraying after a countdown of 30 seconds) to spray the fire extinguishing agent to extinguish the fire. In some embodiments, in order to prevent the airflow of the exhaust unit 1921 from affecting the spraying of the fire extinguishing agent, the exhaust unit 1921 can also be closed and the fire extinguishing component 192 can be started. If the abnormal battery unit 112 has a battery explosion-proof valve, the battery explosion-proof valve can also be opened.

[0110] Taking the battery cell level detection component as an example, when a fire occurs, the composite fire detector 19111 of a battery cell 112 detects abnormal data, forms a first alarm signal, and reports to the gas fire extinguishing controller 19131. The gas fire extinguishing controller 19131 activates the fire sound and light alarm outside the battery cell 112 to alert personnel. Afterwards, another composite fire detector 19111 also alarms, and the two composite fire detectors 19111 form a second alarm signal. The fire control unit 1913 reports to the gas fire extinguishing controller 19131, turns on the partition valve of the fire extinguishing agent branch pipe 19223 of the battery cell 112 corresponding to the composite fire detector 19111, and activates the fire extinguishing agent spraying device 19221. The fire extinguishing agent is sprayed on the corresponding battery cell 112 through the fire extinguishing agent branch pipe 19223 corresponding to the load detector that generates the abnormal alarm to implement fire extinguishing and cooling.

[0111] After the fire extinguishing device is activated, the fire control unit 1913 can select further actions based on the feedback information of the activation of the fire extinguishing device. For example, if thermal runaway occurs after spraying, it is necessary to activate the water injection component 1923 (such as electrically conducting or manually conducting the ball valve 19232 of the water injection fire extinguishing controller 19132 for water injection). In some embodiments, the feedback information may include data for determining whether the thermal runaway condition is met. For example, it may be that the temperature remains high continuously after spraying the fire extinguishing agent. As an example, after receiving the activation signal of the fire extinguishing device, when the temperature measured by the temperature sensor reaches above the first threshold (e.g., 80 °C) and remains for more than the first duration (e.g., 10 minutes), or reaches a higher second threshold (such as 130 °C) and remains for more than a shorter second duration (e.g., minutes), or the temperature sensor or the composite fire detector 19111 drops offline and the temperature is high (e.g., reaches the first threshold) within the third duration (such as 10 minutes) before dropping offline, the water injection fire extinguishing controller 19132 will be triggered to start water injection. In addition, the water injection fire extinguishing control unit can issue a higher-level alarm through the alarm unit 1912, such as coordinated alarms through the sound and light alarms and deflation indicators inside and outside the battery compartment 310.

[0112] Based on the above multi-level alarm fire protection strategy, a fire protection plan at the battery unit 112 level and a fire protection plan at the compartment level corresponding to the battery compartment 310 and the electrical compartment 320 can be realized.

[0113] The fire protection plan at the battery unit 112 level can achieve automatic control and independent fire extinguishing of the original vehicle battery pack 111 on fire, with the function of zoning operation, zoned induction, and zoned activation. When a fire occurs, the composite fire detector 19111 forms a first alarm signal and reports it to the gas fire extinguishing controller 19131, which activates the sound and light alarm to alert the personnel in the protected area. After two or more composite fire detectors 19111 issue a secondary alarm signal, the battery explosion-proof valve of the abnormal battery pack on fire is directly opened, and at the same time, it is reported to the gas fire extinguishing controller 19131 to activate the fire extinguishing device. The fire extinguishing agent is sprayed into the abnormal battery pack through the fire extinguishing agent branch pipe 19223 to implement fire extinguishing and cooling. The gas fire extinguishing controller 19131 will send the signal of the activation of the fire extinguishing device to the water injection fire extinguishing controller 19132, and the water injection fire extinguishing controller 19132 determines that the thermal runaway condition is met based on the detected temperature data and starts water injection.

[0114] The fire protection plan at the compartment level is also implemented according to the three-level early warning.

[0115] Level 1 Alarm - When any one of the detectors inside the box 300 sends out the first fire alarm information, the fire control unit 1913 (such as the gas fire extinguishing control unit therein) will give an early warning prompt through the audible and visual alarm of the alarm unit 1912. If it is the combustible gas detector 19113 that alarms, the exhaust unit 1921 will be linked and opened. Other linkage logics such as shunt trip signal output, fire alarm, fault and other signal outputs can be customized according to actual requirements.

[0116] Level 2 Fire Alarm - After receiving the alarm from another detector in the same protected area, that is, when two or more detectors in the same protected area form a second fire alarm signal, the fire control unit 1913 (such as the gas fire extinguishing control unit therein) will send a linkage signal to close the fan and electric louver, and then send a linkage trigger signal to the fire extinguishing device. After the 30S countdown of the fire extinguishing device's delayed trigger ends, the fire extinguishing agent will be sprayed.

[0117] Level 3 Fire Alarm - When the fire control unit 1913 (such as the water injection fire extinguishing control unit therein) receives the start feedback signal from the fire extinguishing device, it can give an alarm prompt through the in-station audible and visual alarm in the box 300, the out-of-station audible and visual alarm outside the box 300 and the gas discharge indicator light. If the thermal runaway condition is met, the fire control unit 1913 starts the ball valve 19232 for water injection fire extinguishing.

[0118] As Figure 7 shown, it shows the structural schematic diagram of a computer device in an embodiment of the present disclosure.

[0119] The computer device 700 includes a bus 701, a processor 702, and a memory 703. The processor 702 and the memory 703 can communicate through the bus 701. The memory 703 can store computer programs or instructions. The processor 702 realizes the controller in the previous embodiments, such as the energy management system or the fire control unit, etc., by running the computer programs or instructions in the memory 703.

[0120] The bus 701 can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For the sake of easy representation, although only a thick line is used in the figure, it does not mean that there is only one bus or one type of bus.

[0121] In some embodiments, the processor 702 may be implemented as a Central Processing Unit (CPU), a Microcontroller Unit (MCU), a System On Chip, or a Field Programmable Gate Array (FPGA), etc. The memory 703 may include volatile memory for temporarily storing data when the program is running, such as Random Access Memory (RAM).

[0122] The memory 703 may also include non-volatile memory for data storage, such as Read-Only Memory (ROM), flash memory, a Hard Disk Drive (HDD), or a Solid-State Disk (SSD).

[0123] In some embodiments, the computer device 700 may further include a communicator 704. The communicator 704 is used for external communication. In a specific example, the communicator 704 may include one or a group of wired and / or wireless communication circuit modules. For example, the communicator 704 may include one or more of a wired network card, a USB module, a serial interface module, etc. The wireless communication protocols followed by the wireless communication module include, for example, Nearfieldcommunication (NFC) technology, Infrared (IR) technology, Global System for Mobile communications (GSM), General Packet Radio Service (GPRS), Code Division Multiple Access (CDMA), Wideband Code division multiple access (WCDMA), Time-Division Code Division Multiple Access (TD-SCDMA), Long Term Evolution (LTE), Bluetooth (BT), Global Navigation Satellite System (GNSS), etc.

[0124] In an embodiment of the present disclosure, a computer-readable storage medium may also be provided, storing a computer program or instructions, and when the computer program or instructions are run, the controller in the previous embodiments is implemented, such as an energy management system or a fire control unit.

[0125] That is, the method steps in the above embodiments are implemented as software or computer code that can be stored in a recording medium (such as a CD ROM, RAM, floppy disk, hard disk, or magneto-optical disk), or as computer code that is originally stored in a remote recording medium or a non-transitory machine-readable medium and will be stored in a local recording medium and downloaded through a network. Thus, the method represented herein can be stored on such software processing on a recording medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware (such as an ASIC or FPGA).

[0126] In an embodiment of the present disclosure, a computer program product may also be provided, including one or more computer programs or instructions, and when the one or more computer programs or instructions are run, the controller in the embodiment of the present disclosure is fully or partially executed, such as an energy management system or a fire control unit, etc. The computer program product includes one or more computer programs or instructions.

[0127] The computer program or instructions can be stored in a readable storage medium, or transmitted from one readable storage medium to another readable storage medium. For example, the computer program or instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center in a wired or wireless manner. The readable storage medium can be any available medium that can be accessed, or a data storage device such as a server or a data center integrating one or more available media. The available medium can be a magnetic medium, such as a floppy disk, a hard disk, or a magnetic tape; it can also be an optical medium, such as a digital video disc; or it can be a semiconductor medium, such as a solid-state drive. The computer-readable storage medium can be a volatile or non-volatile storage medium, or can include both volatile and non-volatile types of storage media.

[0128] In another embodiment of the present disclosure, an energy storage power station may also be provided, including one or more of the above-mentioned integrated energy storage systems.

[0129] In summary, the present disclosure provides an integrated energy storage system and an energy storage power station. The system includes: an energy storage unit including at least one original vehicle battery pack with a battery management system; an energy storage DC-DC converter electrically connected to each original vehicle battery pack via a first switch unit; an energy storage inverter including a DC terminal and an AC terminal electrically connected to at least one energy storage DC-DC converter; an AC bus connecting the AC terminal and the external power grid; an energy management system connected to the battery management system, the energy storage DC-DC converter, and the energy storage conversion unit to collect operating parameters and send control commands to control charging and discharging; wherein the energy management system is communicatively connected to each battery management system through an adapter to simulate the communication environment of the original vehicle battery pack in an actual vehicle to implement charging and discharging control. Thus, an integrated energy storage system and an energy storage power station are constructed using redundant original vehicle battery packs, solving the problem of the maintenance cost of redundant original vehicle battery packs and effectively supporting new energy consumption and power supply guarantee.

[0130] The above embodiments are merely illustrative of the principles and effects of the present disclosure and are not intended to limit the present disclosure. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present disclosure. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present disclosure should still be covered by the protection scope of the present disclosure.

Claims

1. A complete energy storage system, characterized in that: include: An energy storage unit, comprising at least one original vehicle battery pack for a new energy vehicle, each original vehicle battery pack comprising a battery management system; The energy storage conversion unit includes: at least one energy storage DC-DC converter, electrically connected to each of the original vehicle battery packs via a first switch unit; at least one energy storage converter, including a DC end and an AC end electrically connected to the at least one energy storage DC-DC converter, for converting between a DC voltage and an AC voltage; An AC busbar, electrically connected to the AC terminal and connected to an external power grid; the external power grid is connected to an external load that can be powered by the whole package energy storage system; An energy management system is communicatively connected to the battery management system, the energy storage DC-DC converter, and the energy storage inverter unit to collect their operating parameters and send control instructions to control the charging and discharging of the energy storage unit; wherein the energy management system is communicatively connected to each of the battery management systems through each adapter that can transfer its preset communication interface to the CAN communication interface, and the energy management system simulates the communication environment of the actual vehicle for the original vehicle battery pack so as to obtain the battery operating parameters in real time from the battery management system and manipulate the energy storage inverter unit to execute the charging and discharging of the energy storage unit based on the energy scheduling strategy.

2. The whole package energy storage system according to claim 1, characterized in that: Also includes: The auxiliary subsystem includes at least one of the following auxiliary functional units: a liquid-cooled air conditioning unit; Fire protection systems; Lighting components; The liquid-cooled air-conditioning unit is electrically connected to the AC bus, communicatively coupled to the energy management system, outputs operating parameters of the liquid-cooled air-conditioning unit and receives control instructions; The fire protection system is electrically connected to the AC bus, communicatively coupled to and controlled by the energy management system, outputs operating parameters of the fire protection system and receives control instructions; The lighting assembly is electrically connected to the AC bus.

3. The whole package energy storage system according to claim 2, characterized in that: The operating parameters of the liquid-cooled air-conditioning unit include at least one of the following: ambient temperature, flow rate, inlet and outlet temperatures, and alarm information; and / or the operating parameters of the fire protection system include at least one of the following: alarm information and gas injection signal.

4. The whole package energy storage system according to claim 1, characterized in that: Also includes: A plurality of collectors are arranged and connected to the AC bus and each of its power supply branches, and are used to collect power supply data of the AC bus and its power supply branches; The data acquisition module is communicatively connected to the multiple collectors and the energy management system, and is used to collect the power supply data and transmit it to the energy management system.

5. The whole package energy storage system according to claim 1, characterized in that: Also includes: A smart meter unit, electrically connected to the AC bus to collect power parameters, and communicatively connected to the energy management system to transmit the power parameter signal; The power parameters include at least one of the following: three-phase current, voltage, active power, reactive power, electricity and harmonics, the amount of electricity charged from the external power grid to the whole package energy storage system, and the amount of electricity discharged from the whole package energy storage system to the external power grid.

6. The whole package energy storage system according to claim 1, characterized in that: The battery operating parameters of the energy storage unit include at least one of the following: battery cell voltage, battery cell current, battery cell temperature, bus temperature, state of charge, health, battery energy / power adjustable depth, fault level, high voltage interlock information, and communication status; And / or, the operating parameters of the energy storage conversion unit include at least one of the following: DC voltage, DC current, DC power, AC voltage, AC current, converter internal temperature, clock, frequency, power factor, current input power, current output power, cumulative input power, and cumulative output power.

7. The whole package energy storage system according to claim 1, characterized in that: The energy management system is used to control the charging and discharging of the energy storage unit based on an energy scheduling strategy; the energy scheduling strategy includes at least one of the following: 1) Let the energy storage unit charge according to the valley and flat values ​​of the local electricity price and discharge at the peak value; 2) When the power consumption of the whole energy storage system is restricted by the power grid, the whole energy storage system is discharged according to the power requirements that need to be met in the power consumption scenario; and when the discharge power is greater than the load power of the external load in the power consumption scenario, the reverse output of the whole energy storage system to the upstream external power grid is restricted; 3) A transformer is provided in the AC bus or in the line between the AC bus and the energy storage converter; the sum of the load powers of the loads connected to the output side of the transformer is less than the rated capacity of the transformer; 4) Based on the set demand of the set power usage scenario, limit the power supply power obtained by the entire energy storage system from the external power grid in the power usage scenario to be lower than the difference between the set demand and the load power of the external load in the power usage scenario; and when the load power of the external load is greater than the set demand, stop charging the energy storage unit.

8. The whole package energy storage system according to claim 1, characterized in that: The energy management system is communicatively connected with the cloud platform monitoring system to send the operating status data of the entire package energy storage system to the cloud platform monitoring system for display; or, receive user remote control instructions issued by the cloud platform monitoring system and execute corresponding control actions.

9. The whole package energy storage system according to claim 8, characterized in that: The data displayed by the cloud platform monitoring system includes at least one of the following: real-time tracking of changes in battery operating parameters of energy storage units; operating parameters of energy storage converter units; whole package energy storage system management; user management; alarm management; and revenue management.

10. The whole package energy storage system according to claim 1, characterized in that: The battery management system is used to detect the operating parameters of each battery cell in the original vehicle battery pack and the battery pack temperature in real time and transmit them to the energy management system and energy storage converter in real time to limit each battery cell to a safe working state; The energy storage converter is used to detect the operating parameters of the energy storage unit in real time and limit the energy storage unit to a safe working state within a safe working area; The energy management system is used to detect the operating parameters of the battery management system and the energy storage inverter in real time, and judge whether the entire energy storage system is operating in a normal state based on the operating parameters transmitted by the battery management system and the energy storage inverter; if not, it is disconnected from the external power grid and performs at least one of the following: isolating the energy storage inverter from the energy storage unit; isolating the battery packs in the energy storage unit.

11. The whole package energy storage system according to claim 1, characterized in that: The whole package energy storage system is configured in a box; the box includes a battery compartment and an electrical compartment, and is provided with a fire protection system; The energy storage unit comprises a plurality of battery cells stacked in the battery compartment; each battery cell comprises one or more original vehicle battery packs; The fire protection system comprises: A fire detection and alarm component, comprising a detection unit, an alarm unit and a fire control unit in communication with the detection unit and the alarm unit; the detection unit comprises: a bin-level detection component and a battery unit-level detection component; the bin-level detection component comprises a preset number of temperature-sensing fire detectors, combustible gas detectors and smoke detectors; the battery unit-level detection component comprises: a composite fire detector for detecting combustible gas and temperature arranged corresponding to each battery unit; A fire extinguishing component, which is communicatively connected to and controlled by the fire control unit, comprises an exhaust unit, a fire extinguishing agent spraying component and a water injection component; the exhaust unit is connected to the battery compartment with the outside world; the spraying port of the fire extinguishing component is connected to the battery unit; and the water outlet of the water injection component is connected to the battery compartment; Wherein, the fire control unit responds to the first fire alarm signal of any detector in the warehouse-level detection component and the battery unit-level detection component, activates the alarm unit to alarm; if there is a combustible gas fire, the exhaust unit is linked to exhaust to prevent explosion; The fire control unit responds to the second fire alarm signal of any two detectors belonging to the same protection zone, links the fire extinguishing component to perform the fire extinguishing action after a preset delay; and after the fire extinguishing component is started, an alarm is issued through the alarm unit; After the fire extinguishing action is responded to, the fire control unit starts the water injection component to inject water into the battery compartment according to the temperature data detected by the compartment-level detection component or the battery unit-level detection component meeting the thermal runaway condition.

12. The whole package energy storage system according to claim 11, characterized in that: The fire extinguishing assembly comprises: a fire extinguishing agent spraying device, a fire extinguishing agent main pipe connected to the fire extinguishing agent spraying device, and a fire extinguishing agent branch pipe connected to the fire extinguishing agent main pipe and arranged one by one corresponding to each battery unit; each fire extinguishing agent branch pipe is provided with a partition valve for controlling on / off; The fire control unit links the fire extinguishing component to perform a fire extinguishing action, including: in response to the detector that generates the alarm being a composite fire detector, turning on the partition valve of the fire extinguishing agent branch pipe of the battery unit corresponding to the composite fire detector to perform a fire extinguishing action on the corresponding battery unit.

13. An energy storage power station, characterized in that: Comprising one or more complete energy storage systems as claimed in any one of claims 1 to 12.

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