Battery management method, energy management system and energy storage system

Abstract

The invention relates to new energy, and provides a battery management method, an energy management system and an energy storage system. The method comprises the steps that the energy management system and the battery management system form communication line connection; and the energy management system simulates the original vehicle battery pack to communicate and interact with the battery management system in a running environment of an actual vehicle, so as to obtain battery running parameters of the original vehicle battery pack from the battery management system in real time, and charge and discharge the energy storage unit through the energy storage converter unit based on an energy scheduling strategy. Therefore, the operation environment is simulated through the energy management system, the redundant original vehicle battery pack can be utilized to construct the energy storage system, the maintenance cost problem of the redundant original vehicle battery pack 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 technology, and in particular to a battery management method, an energy management system and an energy storage system. Background Art

[0002] Energy storage power stations are facilities that convert renewable energy (such as solar energy, wind energy, etc.) into electrical energy and store it so that it can be supplied during peak demand periods or when the power system fails. The core function of energy storage power stations is to balance the contradiction between supply and demand 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 is the core energy storage device, and its own cost as well as the control and management (and corresponding R&D) cost are the primary considerations when building an energy storage power station. Summary of the invention

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

[0005] A first aspect of the present disclosure provides a battery management method, which is applied to an energy management system of an energy storage system, wherein the energy storage system includes an energy storage unit, and the energy storage unit is constructed based on an original vehicle battery pack for a new energy vehicle, and the original vehicle battery pack includes a battery management system; the method includes: the energy management system forms a communication line connection with the battery management system; the energy management system simulates the original vehicle battery pack in the operating environment of an actual vehicle to communicate and interact with the battery management system, so as to obtain the battery operating parameters of the original vehicle battery pack from the battery management system in real time, and executes charging and discharging of the energy storage unit through the energy storage converter unit based on the energy scheduling strategy.

[0006] In an embodiment of the first aspect, the energy management system forms a communication line connection with the battery management system via an adapter from a preset communication interface to a CAN interface.

[0007] In an embodiment of the first aspect, the battery operating parameters of the energy storage unit include at least one of: battery cell temperature, battery cell voltage, battery cell current, bus temperature, state of charge, health, battery energy / power adjustable depth, fault level, high-voltage interlock information, communication status, etc.

[0008] In an embodiment of the first aspect, the battery management method further includes: the battery management system detects in real time the operating parameters of each battery cell in the original vehicle battery pack and the battery pack temperature, and limits the operating conditions of the battery cells within a safe operating area accordingly; the energy management system determines whether the energy storage system is operating under normal conditions based on the battery operating parameters obtained from the battery management system; if not, the energy storage system is disconnected from the connected external power grid.

[0009] In an embodiment of the first aspect, the energy storage unit is connected to an AC bus via an energy storage converter unit; the AC bus forms a plurality of power supply branches; AC switch units are provided in the AC bus and the power supply branches; the energy management system is communicatively connected to a programmable logic controller, and the programmable logic controller is connected to each of the AC switch units; the battery management method comprises: the energy management system instructs the programmable logic controller to control the on / off of each of the AC switch units; and, when a fault in the energy management system is detected, the programmable logic controller shuts down the designated AC switch unit.

[0010] In an embodiment of the first aspect, the original vehicle battery pack is connected to the energy storage converter unit via a DC switch unit; the programmable logic controller is connected to each of the DC switch units; the battery management method includes: the energy management system instructs the programmable logic controller to control the on / off of each of the DC switch units; and when an energy management system fault is detected, the programmable logic controller shuts down the specified DC switch unit.

[0011] In an embodiment of the first aspect, 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) charging the energy storage unit according to the valley and flat values ​​of the local electricity price and discharging at the peak value; 2) when the power consumption of the power grid in the power consumption scenario where the energy storage system is located is restricted, the energy storage unit is discharged according to the power requirements that need to be met in the power consumption scenario; when the discharge power is greater than the load power of the external load in the power consumption scenario, the reverse output of the energy storage unit to the upstream external power grid is restricted; 3) the energy storage unit is coupled to an AC bus through an energy storage converter unit; 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 consumption scenario, the power supply power obtained by the entire package energy storage system from the external power grid in the power consumption scenario is restricted 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, the charging of the energy storage unit is stopped.

[0012] In an embodiment of the first aspect, the energy management system is communicatively connected to a cloud platform monitoring system, and the battery management method includes: the energy management system sends operating status data of the energy storage system to the cloud platform monitoring system for display; or, receives user remote control instructions issued by the cloud platform monitoring system and executes corresponding control actions.

[0013] A second aspect of the present disclosure provides an energy management system, comprising:

[0014] Communicator, processor and memory;

[0015] The memory stores computer programs or instructions;

[0016] The processor is used to run the computer program or instruction to execute the battery management method as described in any one of the first aspects.

[0017] A third aspect of the present disclosure provides an energy storage system, comprising one or more energy management systems as described in the second aspect.

[0018] As described above, the present disclosure relates to new energy, and provides a battery management method, an energy management system, and an energy storage system. The method includes: the energy management system forms a communication line connection with the battery management system; the energy management system simulates the original vehicle battery pack in the actual vehicle operating environment to communicate and interact with the battery management system, so as to obtain the battery operating parameters of the original vehicle battery pack from the battery management system in real time, and perform charging and discharging of the energy storage unit through the energy storage converter unit based on the energy scheduling strategy. Thus, by simulating the operating environment through the energy management system, the energy storage system can be constructed using redundant original vehicle battery packs, solving the maintenance cost problem of redundant original vehicle battery packs and effectively supporting the consumption of new energy and power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram showing the electrical connection structure of the energy storage system in an embodiment of the present disclosure is shown.

[0020] Figure 2 A schematic structural diagram of the energy storage converter described in an embodiment of the present disclosure is shown.

[0021] Figure 3 A schematic diagram showing the communication connection structure between the energy management system and other components in an embodiment of the present disclosure.

[0022] Figure 4A A flowchart of a battery management method of an energy management system in an embodiment of the present disclosure is shown.

[0023] Figure 4B exhibit Figure 4A Schematic diagram of the principle of implementing the battery management method.

[0024] Figure 5 A schematic diagram showing the mechanical structure of the energy storage system in an embodiment of the present disclosure is shown.

[0025] Figure 6 A schematic diagram showing the arrangement structure of the fire protection system of the energy storage system in the embodiment of the present disclosure.

[0026] Figure 7 A schematic diagram of the structure of a fire control unit in an embodiment of the present disclosure is shown.

[0027] Figure 8 A schematic diagram showing the structure of a computer device in an embodiment of the present disclosure.

[0028] Fig. 9 A schematic diagram of an electricity usage scenario in an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0029] The following is an explanation of the embodiments of the present disclosure by specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the information disclosed by the present disclosure. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in the present disclosure can also be modified or changed in various ways according to different viewpoints and application modules without departing from the spirit of the present disclosure. It should be noted that the embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0030] The following is a detailed description of the embodiments of the present disclosure with reference to the accompanying drawings so that those skilled in the art can easily implement the present disclosure. The present disclosure can be embodied in many different forms and is not limited to the embodiments described herein.

[0031] In the representations of the present disclosure, the reference terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" and the like mean that the specific features, structures, materials or characteristics represented in conjunction 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 may be combined in any one or a group of embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples represented in the present disclosure and the features of different embodiments or examples, unless they are mutually contradictory.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the representation of the present disclosure, "a group" means two or more, unless otherwise clearly and specifically defined.

[0033] In order to clearly describe the present disclosure, components not related to the description are omitted, and the same reference numerals are given to the same or similar components throughout the specification.

[0034] Throughout the specification, when a device is said to be "connected" to another device, this includes not only the case of "direct connection" but also the case of "indirect connection" by placing other elements therebetween. In addition, when a device is said to "include" a certain component, unless otherwise stated, it does not exclude other components, but means that other components may be included.

[0035] Although the terms first, second, etc. are used to represent various elements in this article in some examples, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, the first interface and the second interface, etc. are represented. Moreover, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising" and "including" indicate that there are the described features, steps, operations, elements, modules, projects, kinds, and / or groups, but do not exclude the existence, occurrence or addition of one or a group of other features, steps, operations, elements, modules, projects, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "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". Only when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way, will there be an exception to this definition.

[0036] The technical terms used herein are only used to refer to specific embodiments and are not intended to limit the present disclosure. The singular form used herein also includes the plural form unless the sentence clearly indicates the contrary meaning. The meaning of "including" used in the specification is to specify 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.

[0037] Although not defined differently, all terms, including technical and scientific terms used herein, have the same meaning as those generally understood by those skilled in the art to which the present disclosure belongs. Terms defined in commonly used dictionaries are additionally interpreted as having meanings consistent with relevant technical literature and the message of the present disclosure, and shall not be overly interpreted as ideal or very formal meanings unless defined.

[0038] In a battery-based energy storage power station, the battery is the core energy storage device, and its own cost and control management (and corresponding R&D) cost are the primary considerations for building an energy storage power station. If the batteries used in the energy storage power station are brand new, it will increase the battery cost and the cost of asking the battery manufacturer to rebuild the control management system (such as the energy management system EMS) or self-developed control management system, and it is also not conducive to environmental protection.

[0039] Considering that the sales volume of vehicle OEMs is not as high as expected due to the iteration of vehicle models, each model will have a lot of spare battery packs and inventory battery packs. These battery packs need a high-standard warehouse and professional personnel to do maintenance and recharging, which is an additional cost for the OEMs. These battery packs are not cheap when they are purchased. If they are sold at a depreciated price, there will be a large loss, which is not worth the loss.

[0040] In view of this, the applicant has developed an energy storage system based on the needs of this scenario to extend the value of the battery pack throughout its life cycle.

[0041] The disclosed embodiments provide an energy storage system and an energy storage power station. The energy storage system can utilize original vehicle battery packs such as spare battery packs, inventory battery packs, old batteries, and even retired battery packs to construct energy storage units, thereby utilizing the extra batteries of the OEM to solve the maintenance cost problem of the extra battery packs of the OEM, and is more environmentally friendly. In addition, a coordinated energy management system is provided to achieve charge and discharge control, thereby effectively storing new energy, effectively supporting new energy consumption and power supply, and achieving multiple goals at one stroke.

[0042] like Figure 1 As shown, a schematic diagram of the electrical connection structure of the energy storage system in an embodiment of the present disclosure is shown.

[0043] exist Figure 1 In the embodiment, the energy storage system 100 includes: an energy storage unit 110, an energy storage conversion unit 120 and an energy management system 130 (Energy Management System, EMS).

[0044] The energy storage unit 110 includes: at least one original vehicle battery pack 111 for a new energy vehicle. As an example, the original vehicle battery pack 111 may be one or more of a ternary lithium battery, an iron lithium battery, a sodium ion battery, a lead-acid battery, a solid-state battery, and the like. In some embodiments, the energy storage unit 110 includes multiple original vehicle battery packs 111, and the multiple original vehicle battery packs 111 may constitute one or more battery clusters. In some embodiments, each original vehicle battery pack 111 may be independently packaged. In some embodiments, each original vehicle battery pack 111 may include a battery management system 1111 (BMS).

[0045] The original vehicle battery pack 111 may be a spare battery pack, a stock battery pack, an old battery pack, or even a retired battery pack (or a brand new battery pack), without any disassembly or damage to the original structure. In some embodiments, the original vehicle battery pack 111 may be integrated with an existing high-voltage distribution box, a BMS, an external connector, a liquid cooling plate, etc., and other units may be combined around the energy storage unit 110 to quickly, efficiently, and at low cost build a complete energy storage system 100.

[0046] In some embodiments, the operating state of the battery in the energy storage working environment is much better than the actual operating state in the car, which can effectively extend the life of the original vehicle battery pack 111. The common charge and discharge rate of a car is 2C, that is, the ratio of the battery capacity to the charge and discharge current is 2, but in the energy storage working environment, the maximum charge and discharge rate of the original vehicle battery pack 111 is no more than 0.5C, which is much lower than 2C, and the ambient temperature is stable, without vibration and impact of the car moving, etc., so the old or retired original vehicle battery pack 111 can also have a long service life in the energy storage working environment. Therefore, the use of old or retired original vehicle battery packs 111 in the embodiments of the present disclosure to construct the energy storage system 100 not only reduces costs but also has better service quality and reliability, and has extremely high commercial value and environmental value.

[0047] In some embodiments, based on stricter reference standards, battery packs with better health status among recycled old batteries or retired batteries can be screened according to the battery state of health (SoH) to construct the energy storage unit 110. For example, battery packs with SoH above 90% are preferably selected to construct the energy storage unit 110.

[0048] In some embodiments, the inherent BMS of the original vehicle battery pack 111 may have measurement function, fault alarm function, protection function, self-diagnosis function, and balancing function. In the disclosed embodiment, a path for information and control command interaction can be established between the EMS and the BMS, and these functions can be retained and functioned.

[0049] The energy storage conversion unit 120 includes: an energy storage DC-DC converter 121 and an energy storage converter 122 (Power Conversion System, PCS). Both the energy storage DC-DC converter 121 and the energy storage converter 122 (Power Conversion System, PCS) are bidirectional, so as to be suitable for charging and discharging the original vehicle battery pack 111.

[0050] In some embodiments, the energy storage DC-DC converter 121 corresponds to the number of each original vehicle battery pack 111, and is connected to each original vehicle battery pack 111, respectively, for converting the output voltage of the positive and negative electrodes of each original vehicle battery pack 111 from DC to DC, and then leading them to the positive and negative lines of the DC bus, respectively. 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 disconnect itself when the current in the line reaches a certain value, thereby forming protection. For example, when the current flowing into or out of the original vehicle battery pack 111 is too large, it is disconnected to protect the original vehicle battery pack 111 or the device 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 range of 200V to 800V DC voltage, and 400V can usually be selected, wherein the low voltage lower limit 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 range of 650V to 880V DC voltage, and the high-voltage side current is, for example, in the range of -75A to 75A. That is, when the energy storage unit 110 is charged, it may be charged by stepping down from the high-voltage side to the low-voltage side, and when the energy storage unit 110 is discharged, 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., which can be connected to external communication to accept external control and output data.

[0051] In some embodiments, the energy storage converter 122 includes a DC terminal and an AC terminal electrically connected to the at least one energy storage DC-DC converter 121, for conversion between DC voltage and AC voltage. In some embodiments, the energy storage converter 122 can be implemented as a bidirectional inverter. When the energy storage unit 110 is discharged, the output DC voltage of the energy storage unit 110 from the DC terminal can be inverted into an AC voltage and output at the AC terminal, or when the energy storage unit 110 is charged, the input AC voltage from the AC terminal is converted into a DC voltage and output to the energy storage unit 110 at the DC terminal.

[0052] Figure 2The schematic diagram of the structure of the energy storage converter 122 is schematically shown in FIG. 1 , which includes three groups of transistors connected in pairs and connected to three-phase four-wire (three-phase wires A, B, C and neutral wire N), respectively. Each group of transistors includes Q1, Q2 (or Q6), Q3 (or Q5), and Q4. Q1 to Q6 are MOS transistors, wherein Q1 and Q2 (or Q6) are NMOS, and the drain and source are connected to each other to form a first connection point, and the first connection point is connected to one of A, B, and C. Q3 and Q5 are PMOS and NMOS Q4 are connected to the same drain, and the source of Q4 is connected to the first connection point, and the source of Q3 and Q5 is connected to the neutral wire. It also includes capacitors C1, C2, and C3. C1 and C2 are connected in series and in parallel with C3, and are also connected in parallel with Q1 and Q2. The second connection point between C1 and C2 is connected to the N line. A bypass unit can be provided in the C3 branch line. The bypass unit includes: a direct connection line with a first switching element; and a resistance branch line connected in series with a second switching element and a resistor R in parallel with the direct connection line. By switching the first switching element and the second switching element, R can be selected to be connected to form an RC circuit, or R can be bypassed.

[0053] 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 the multiple PCS modules. For example, the energy storage converter 122 includes 5 100KW PCS modules, 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 the following functions, such as short circuit protection, reverse polarity 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, and anti-islanding protection.

[0054] In a grid-connected scenario, a 380V low-voltage grid connection can be selected and connected to the user's 380V low-voltage distribution cabinet. The energy storage unit 110 is connected to the PCS after the DC bus 123 is converged by each energy storage DC-DC converter 121. After the PCS converts the output voltage to 380V, it is then connected to the user's 380V low-voltage bus through the low-voltage distribution cabinet.

[0055] The energy storage system 100 also includes an AC bus 160, which is electrically connected to the AC end of the energy storage converter 122 and connected to the external power grid. In some embodiments, the AC bus 160 can be connected to the external power grid via the AC switch unit 150 to control the on and off of the external power grid. The AC switch unit 150 can be implemented as an AC circuit breaker, which disconnects the AC bus 160 from the external power grid when the current / voltage reaches the disconnection standard to form protection. In some embodiments, the AC bus 160 can be connected to each power supply branch line of each electrical equipment (such as liquid-cooled air-conditioning unit 180, fire protection system 190, lighting assembly 1000, EMS and other controllers) in each energy storage system 100. An AC switch unit 150 can be provided, which can be implemented as an AC circuit breaker to protect each electrical equipment.

[0056] like Fig. 9 As shown, the external power grid can provide a trunk line, and various loads can be connected to the trunk line in parallel to obtain power supply. The loads may include an energy storage system 100 and other external loads 200. In a certain power usage scenario, such as a factory of a certain user, various external loads such as industrial equipment and an energy storage system 100 are included. When connected to the external power grid, the industrial equipment and the energy storage system 100 can obtain power supply, and the energy storage system 100 can be charged. Alternatively, the energy storage system 100 can also discharge to power the industrial equipment in the power usage scenario.

[0057] Back to Figure 1 In some embodiments, the energy storage conversion unit 120 may further include a transformer 1020 connected between the energy storage converter 122 and the AC bus 160 , and used to transform the AC voltage transmitted between the energy storage converter 122 and the AC bus 160 to a required voltage value.

[0058] It should be 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 connected to the DC bus 123 (bus) through its corresponding energy storage DC-DC converter 121, and is connected to an energy storage converter 122 after being collected through the DC bus 123. However, in other embodiments, the structure of the energy storage conversion unit 120 can also be that each original vehicle battery pack is connected to the AC bus in parallel through an energy storage DC-DC converter 121 and an energy storage converter 122 to form a collection on the AC bus, and the structure of the energy storage conversion unit 120 also belongs to the protection scope of the present application.

[0059] 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. The energy management system 130 is communicatively connected to each of the battery management systems 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.

[0060] You can refer to Figure 3 As shown, a schematic diagram of the communication connection structure between the energy management system 130 and other components is shown.

[0061] exist Figure 3 In the embodiment, the energy management system 130 is configured as a physical device, having multiple Ethernet ports, connected to external communication 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 connected to the BMS of multiple original vehicle battery packs via CANFD devices T1, T2, and T3.

[0062] The energy management system 130 can also be 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 connected to the energy storage DC-DC converter 121 through other Ethernet ports on the first gateway T1 or other Ethernet ports of the energy management system 130. Alternatively, the communication interface of the energy storage DC-DC converter 121 can also be connected to the energy management system 130 through other communication interfaces (such as USB interfaces) after conversion by a converter. The above implementation method can be more flexible and is not limited.

[0063] 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 a 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 the external Internet. Optionally, the remote end can be implemented as a cloud platform monitoring system 200.

[0064] In order to obtain the battery operating parameters from the battery management system 1111 of the original vehicle battery pack 111 to achieve monitoring, and to control the charge and discharge of the battery management system 1111, the energy management system 130 can simulate the operating environment of the original vehicle battery pack 111 in the actual vehicle by running a program, so as to obtain the battery operating parameters from the battery management system 1111 in real time and control the charge and discharge. Specifically, the energy management system 130 has the logic simulation function of the vehicle ECU node, thereby simulating the operating environment of the original vehicle battery pack 111 still running in the actual vehicle environment, without modifying the software of the original vehicle battery pack 111.

[0065] For example, the vehicle CAN bus communication environment required by the BMS is simulated, and the CAN bus data generated during the communication process of the original vehicle battery pack 111 is captured. The message information sent by the nodes in the whole vehicle to the BMS is simulated, the BMS is controlled to enter various working conditions, and the messages sent by the BMS are responded to. In some embodiments, the energy management system can realize communication with the vehicle BMS and control charging and discharging by importing the original vehicle BMSDBC file to meet the energy scheduling strategy set by the system.

[0066] In an optional embodiment, the energy management system 130 may be disposed in a control cabinet, which may include an industrial computer, a programmable logic controller 1010 (PLC), an uninterruptible power supply (UPS), a gateway device (router, switch), a display screen and other components.

[0067] In some embodiments, the UPS can be connected to the AC bus 160 and can provide 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 time, such as 30 minutes to 60 minutes, in the event of a power outage.

[0068] 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.

[0069] 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. Thus, all battery operating parameters sent by the BMS of the original vehicle battery pack 111 can be read, including at least one of the battery cell temperature, battery cell voltage, battery cell current, bus temperature, state of charge, health, battery energy / power adjustable depth, fault level, high-voltage interlock information, communication status, etc., 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.

[0070] 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.

[0071] 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.

[0072] In some embodiments, in order to expand the types of supported BMS, the EMS may also reserve an extended communication interface for data interoperability with other vehicle manufacturers' EMS monitoring systems, such as an extended communication interface that supports multiple communication protocols such as MODBUS, DL / T 860, DL / T634.5104 and DL / T 634.5101.

[0073] In some embodiments, see Figure 1 and Figure 3 As shown, the energy storage system 100 may further include a smart meter unit 170, which is electrically connected to the AC bus 160 to collect power parameters and is communicatively connected to the energy management system 130 to transmit the power parameter signal. Figure 3 In the example, the smart meter unit 170 can 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 can use a bidirectional high-precision smart meter that can measure all common power parameters, such as three-phase current, voltage, active power, reactive power, electricity and harmonics, the amount of electricity charged from the external power grid to the energy storage system 100, and the amount of electricity discharged from the energy storage system 100 to the external power grid. It also has a complete communication function to communicate with the EMS. In some embodiments, the smart meter unit 170 can have a display interface that can display the amount of electricity charged by the external power grid to the energy storage system and the amount of electricity discharged by the energy storage system to the external power grid.

[0074] Optionally, the energy storage system 100 may further include an auxiliary subsystem, and the auxiliary subsystem may include at least one auxiliary functional unit. The auxiliary functional unit may be, for example, a liquid cooling air conditioning unit 180 , a fire protection system 190 , or a lighting assembly 1000 .

[0075] The liquid cooling 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 to output operating parameters of the liquid cooling air conditioning unit 180 and receive control instructions. In some embodiments, the operating parameters of the liquid cooling air conditioning unit 180 include at least one of the following: ambient temperature, flow rate, inlet and outlet temperature, and alarm information.

[0076] In some embodiments, the liquid-cooled air conditioning unit 180 includes a liquid cooler and an external piping system. As an example, the liquid cooler mainly includes three modules: a refrigeration circuit, a coolant circuit, and an electronic 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 high- and low-pressure switches. The coolant circuit is composed of components such as a water pump, a water tank, a flow detector, and a temperature-sensitive fire detector. The coolant can be water or other types of coolants, and is not limited to water. The electronic control system mainly includes a controller, a frequency converter, a circuit breaker, a contactor, a relay, and the like. As an example, the external piping system mainly includes connecting pipes, fan coils, and water distribution components, wherein the water distribution components may include ball valves, automatic exhaust valves, and connecting pipes. The external piping system can achieve functional matching with the liquid cooler to meet the thermal management requirements of the original vehicle battery pack 111 in the energy storage unit 110.

[0077] During the temperature adjustment process, the refrigeration circuit and the coolant circuit exchange heat through the plate heat exchanger to keep the water tank temperature within the set temperature range. The water pump supplies the coolant to the original vehicle battery pack 111 and the fan coil, while satisfying the control of the original vehicle battery pack 111 temperature and the ambient temperature to work within a suitable temperature range.

[0078] When the energy storage system 100 is in operation, the temperature of the battery core can be controlled at 25°C ± 3°C. In addition, the temperature of the energy storage system 100 can be adjusted by a coil fan. Optionally, the coil fan also has a dehumidification function.

[0079] The 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. Therefore, the liquid-cooled air-conditioning unit 180 can have both cooling and heating functions to adjust the working temperature of the original vehicle battery pack 111. Through the cooling function of the liquid-cooled air-conditioning unit 180, the original vehicle battery pack 111 can be effectively cooled, and the problems of thermal runaway, serious battery capacity attenuation, and product life attenuation caused by the excessive temperature in the container during the charging and discharging process of the original vehicle battery pack 111 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 be started in cold areas can be effectively solved, ensuring that the original vehicle battery pack 111 starts normally, and the original vehicle battery pack 111 operates efficiently within a suitable temperature range. At the same time, it can also effectively solve the problem of too low temperature in the container in winter.

[0080] In some embodiments, the fire protection system 190 is electrically connected to the AC bus 160 to obtain power supply, is communicatively coupled and controlled by the energy management system 130, outputs operating parameters of the fire protection system 190 and receives control instructions. In some embodiments, the fire protection system 190 can implement one or more fire protection actions such as fire alarm, exhaust explosion prevention, fire extinguishing agent spraying, and even water flooding and fire extinguishing, and the operating parameters of the fire protection system 190 may include at least one of the following: alarm information, gas injection signal.

[0081] In some embodiments, the lighting assembly 1000 is electrically connected to the AC bus 160 to obtain power. The lighting assembly 1000 may include one or more of a lighting fixture, an indicator light, and the like.

[0082] In some embodiments, the 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 arranged in the AC bus 160 and each of its power supply branches, and are used to collect power supply data of the AC bus 160 and its power supply branches, such as voltage, current, etc. The power supply branch may include a power supply branch connected to each auxiliary functional unit and the energy storage converter 122. In some embodiments, an AC switch unit 150 may also be respectively arranged 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, and is used to collect the power supply data and transmit it to the energy management system 130.

[0083] exist Figure 1 The energy management system 130 in the embodiment can also be used to control the charging and discharging 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, reverse flow prevention and power limit support, transformer capacity protection, set demand protection, etc.

[0084] Peak shaving and valley filling refers to charging the energy storage unit 110 according to the valley and average values ​​of the local electricity price and discharging at the peak value. Specifically, charging and discharging are performed according to the set time, discharging during the peak electricity price period and charging during the valley and average electricity price period.

[0085] Anti-backflow and power-limiting support refers to the discharge of the energy storage unit 110 according to the power requirements that need to be met by the external load connected in parallel with the energy storage system 100 to the external power grid in the power usage scenario when the power usage of the power grid is limited in the power usage scenario. In addition, when the discharge power of the energy storage system 100 is greater than the load power of the external load, the reverse flow of the energy storage system 100 to the external power grid is limited. Specifically, when the power usage scenario is limited (that is, the power grid limits the power usage of power equipment), the energy storage unit 110 is discharged according to the power requirements and the power load. The energy storage system 100 does not discharge upstream of the grid connection point with the external power grid. An electric meter with communication capabilities and capable of transmitting active power can be set on the main incoming line side of the grid connection point.

[0086] Transformer capacity protection. The energy storage unit is coupled to an AC bus through an energy storage converter unit. 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 connected to the output side of the transformer is less than the rated capacity of the transformer. For example, Figure 1 In an embodiment, the energy storage converter 122 can be electrically connected to the AC bus 160 via a transformer 1020; when the energy storage unit 110 is charged, the output side of the transformer 1020 is the first side connected to the energy storage converter unit 120, and the connected load is the internal load such as the energy storage converter unit 120 and the energy storage unit 110, and the sum of the charging power of each energy storage unit 110 is limited to be less than the rated capacity of the transformer 1020. And, when the energy storage unit 110 is discharged and connected to the external power grid, the output side of the transformer 1020 is the second side connected to the AC bus, and the connected load is the internal load such as the liquid cooling air conditioning unit 180, and in the grid-connected mode, it also includes the external load in the external power grid, and the connected internal load, or the sum of the load power of the internal load and the external load can be limited 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 energy storage system 100 by communicating with the transformer 1020 or through the data acquisition module to obtain real-time load power.

[0087] In another embodiment, the transformer may also be disposed in the AC bus 160, for example, between the connection point between the AC bus 160 and the external power grid and the connection point between the AC bus 160 and each auxiliary functional unit (for example, Figure 1 In the B position), when the whole package energy storage system is powered by the external power grid, the output side of the transformer is the side for internal loads such as the auxiliary functional units and the energy storage unit 110, and the sum of the load powers of the internal loads is limited to be less than the rated capacity of the transformer.

[0088] Set demand protection refers to limiting the power supply power (i.e. charging) obtained by the energy storage system 100 to be lower than the difference between the set demand and the load power of the external load in the power usage scenario based on the set demand of the set power usage scenario, and when the load power of the external load is greater than the set demand, stopping the charging of the energy storage unit 110 to ensure the power supply of the external load in the power usage scenario. EMS can track the load power output of the entire energy storage system to the external power grid.

[0089] It is understandable 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 conversion unit 120 .

[0090] In some embodiments, the energy management system 130 is connected to the cloud platform monitoring system 200 in a communication connection manner such as Figure 3 As shown, the operating status data of the energy storage system 100 is sent to the cloud platform monitoring system 200 for display. The energy management system 130 can also receive user remote control instructions issued by the cloud platform monitoring system 200 and execute corresponding control actions. In some embodiments, the data displayed by the cloud platform monitoring system 200 includes at least one of the following: real-time tracking of changes in battery operating parameters of the energy storage unit 110; operating parameters of the energy storage converter unit 120; energy storage system 100 management; user management; alarm management; revenue management.

[0091] In an optional 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 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.), and can also study distributed data acquisition technology and integrate multi-system and multi-protocol communications. In some examples, all data on the EMS can be sent to the remote cloud platform monitoring system 200 through a wireless router through the TCP / IP protocol, which can realize the online detection function and remote monitoring function of the energy storage system 100 through the cloud platform detection system by mobile terminals (such as mobile phones) browsers, computers and other terminals.

[0092] In an optional example, the user can view the operating parameters of the energy storage unit 110 through the cloud platform monitoring system 200, such as battery cell voltage, temperature, current, SOC, SOH, and the energy / power of the battery system can be adjusted in depth. For example, the battery status displays: communication status, main relay status, SOC, SOH, fault level, high-voltage interlock information. In an optional example, the user can view the operating 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 cloud platform monitoring system 200 can set and adjust the operating status and operating mode of the battery energy storage system, such as data display, collection, and uploading.

[0094] Based on the above embodiments, a battery management method of the energy management system 130 is provided. Figure 4A and Figure 4B .like Figure 4A As shown, a flow chart of the battery management method of the energy management system in the embodiment of the present disclosure is shown. Figure 4B Shown, displayed Figure 4A Schematic diagram of the principle of implementing the battery management method.

[0095] like Figure 4A The battery management method shown includes:

[0096] Step S401: The energy management system forms a communication line connection with the battery management system.

[0097] For reference Figure 4B For example, the energy management system can establish a communication connection with the battery management system through a preset communication adapter T for CAN interface. For further example, the adapter T can be a CANFD device for Ethernet to CAN.

[0098] For example, Figure 3 As shown, the energy management system has an Ethernet port and can be connected to each CANDFD device T2, T3, T4 through a first gateway.

[0099] Step S402: The energy management system simulates the original vehicle battery pack in the actual vehicle operating environment to communicate and interact with the battery management system to obtain the battery operating parameters of the original vehicle battery pack from the battery management system in real time, and executes charging and discharging of the energy storage unit through the energy storage conversion unit based on the energy scheduling strategy.

[0100] In some embodiments, reference may be made to Figure 4BThe energy management system 130 can simulate the vehicle CAN bus communication environment 132 required by the battery management system 1111 by importing the original vehicle BMS DBC file 131, and capture the CAN bus communication data generated during the communication process of the original vehicle battery pack 111. Through the vehicle CAN bus communication environment, the message information sent by the node in the vehicle to the BMS is simulated, the BMS is controlled to enter various working conditions, and the message sent by the BMS is responded to. Communication with the vehicle BMS is realized and charging and discharging are controlled to meet the energy scheduling strategy set by the system.

[0101] In some embodiments, the energy management system 130 is communicatively connected to the programmable logic controller 1010 to control the on / off of the AC switch unit and the DC switch unit through the PLC to form power supply, and can automatically shut down to form protection when the energy management system 130 fails.

[0102] In some embodiments, the battery management system 1111 and the energy management system 130 can realize the monitoring of whether the multi-level working state of the object from small to large is 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 a safe working state. That is, the BMS can monitor and control the safe working state of the battery cell 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 energy storage system is working 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, and the energy storage inverter 122 is isolated from the energy storage unit, and the battery packs in the energy storage unit 110 are isolated. That is, the EMS can monitor and control the safe working state of the energy storage system 100 in real time. For another example, the energy storage converter 122 can detect the operating parameters of the energy storage unit 110 in real time and limit the energy storage unit to 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.

[0103] In some embodiments, 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 above-described strategies: peak shaving and valley filling, reverse flow prevention and power limit support, transformer capacity protection, set demand protection, etc. No further details will be given here.

[0104] In some embodiments, the energy management system sends the operating status data of the energy storage system to the cloud platform monitoring system for display; or, receives the user remote control instructions issued by the cloud platform monitoring system and executes corresponding control actions.

[0105] like Figure 5 , which shows a schematic diagram of the mechanical structure of the energy storage system 100 in an embodiment of the present disclosure.

[0106] exist Figure 5 In the embodiment, the energy storage system 100 is configured in a box 300, which can be implemented as a container. To facilitate observation of the internal equipment distribution of the box 300, Figure 5 Part of the side panels of the box 300 are omitted. The box 300 includes a battery compartment 310 and an electrical compartment 320. The multiple battery cells 112 contained in the energy storage unit 110 are stacked in the battery compartment 310. Each battery cell 112 includes one or more original vehicle battery packs 111. The multiple battery cells 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 converter 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 set in the electrical compartment 320, and the AC bus 160 and its power supply branches connecting various auxiliary function units, EMS, etc., as well as the AC bus 160 and the AC switch units 150 in the power supply branches can be arranged in the power distribution cabinet. As an example, the smart meter unit can be in the power distribution cabinet. A control cabinet can be set up, which is powered by a 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 may be a switching power supply, which is used to convert the AC voltage (such as 220V) provided by the power supply branch line into a working voltage (such as 12V, 24V, etc.) suitable for the control cabinet. As an example, the liquid cooling air conditioning unit 180 may also be arranged in the electrical compartment 320.

[0107] like Figure 6 As shown, a schematic diagram of the layout structure of the fire protection system in an embodiment of the present disclosure is shown.

[0108] The box 300 is provided with a fire protection system 190. The fire protection system 190 includes a fire detection alarm component 191 and a fire extinguishing component 192. Specifically, the fire detection alarm component 191 includes a detection unit 1911, an alarm unit 1912, and a fire control unit 1913 that is communicatively connected to the detection unit 1911 and the alarm unit 1912.

[0109] In some embodiments, the alarm unit 1912 may include at least one of an in-station sound and light alarm, a gas release alarm (which may also be an indicator light), and an alarm bell installed in the box 300. Optionally, the alarm unit 1912 may also include an out-station sound and light alarm, a gas release alarm, and the like located outside the box 300 for alarm prompting. The alarm unit 1912 may be controlled by the fire control unit 1913 to alarm, or may be connected to a manual alarm button for the user to manually alarm.

[0110] In some embodiments, the detection unit 1911 includes a bin-level detection component and a battery cell-level detection component. The battery cell-level detection component includes a composite fire detector 19111 for detecting combustible gas and temperature, which is arranged corresponding to each battery cell 112. As an example, the composite fire detector 19111 can be arranged on each battery cell 112, for example, on the surface of the battery cell 112.

[0111] The compartment-level detection assembly includes a preset number of temperature-sensing fire detectors 19112, combustible gas detectors 19113, and smoke detectors 19114. The detectors in the compartment-level detection assembly can be distributed in the battery compartment 310 or the battery compartment 310 and the electrical compartment 320, and can be set at the top. Figure 6 In an embodiment, the warehouse-level detection assembly may include a group of two heat-sensing fire detectors 19112. They are arranged in one side area of ​​the top of the battery compartment 310. A group of heat-sensing fire detectors 19112 and smoke detectors 19114 are arranged on the top of the other side area. A combustible gas detector 19113 is arranged on the top of the top between the two side areas, and the combustible gas detector 19113 may be a composite gas detector for detecting hydrogen (H2) and carbon monoxide (CO). Optionally, a group of heat-sensing fire detectors 19112 and smoke detectors 19114 may also be arranged on the top of the electrical compartment 320 to detect a fire spreading to the electrical compartment 320.

[0112] The fire extinguishing assembly 192 is communicatively connected to and controlled by the fire control unit 1913 to execute the fire extinguishing action under the control of the fire control unit 1913. In some embodiments, the fire extinguishing assembly 192 includes an exhaust unit 1921, a fire extinguishing agent spraying assembly 1922 and a water injection assembly 1923.

[0113] The exhaust unit 1921 is connected to the battery compartment 310 with the outside world, and is used to exhaust the battery compartment 310 to prevent explosion. In some embodiments, the exhaust unit 1921 may include a fan, and an air inlet and an air outlet (which may also include a shutter) arranged on the side wall of the box body 300 and connected to the battery compartment 310. The fan may be arranged in the flow channel between the air inlet and the air outlet, for example, at the air outlet. The exhaust unit 1921 may be connected to and controlled by the fire control unit 1913. Optionally, the fan may also have a manual fan switch, which allows the user to manually start and stop the fan.

[0114] The spraying port of the fire extinguishing agent spraying assembly 1922 is connected to the battery unit 112. Figure 6 In the embodiment, the fire extinguishing agent spraying assembly 1922 is shown to include a fire extinguishing agent spraying device 19221, a fire extinguishing agent main pipe 19222 and each fire extinguishing agent branch pipe 19223. Optionally, the fire extinguishing agent spraying device 19221 can be arranged in the electrical compartment 320 adjacent to the battery compartment 310. The fire extinguishing agent in the fire extinguishing agent spraying device 19221 can be perfluoroacetone. Compared with heptafluoropropane, perfluorohexanone has a higher insulation strength, and after extinguishing the open fire, perfluorohexanone can be intermittently sprayed to maintain the concentration of local and full flooding, which is beneficial to suppress the thermal runaway of the battery and achieve continuous suppression of re-ignition. Perfluorohexanone is a liquid at room temperature and can be safely transported and stored at normal pressure using ordinary containers, which can meet the performance requirements of separately configuring a fire extinguishing medium nozzle for each battery cell 112 as recommended by the regulations. Perfluorohexanone has an ODP (ozone depletion potential) of zero, a low GWP, and an atmospheric residence time of 5 days. It is a green and environmentally friendly refrigerant with excellent performance and is expected to replace other traditional fire extinguishing media such as heptafluoropropane. The fire extinguishing agent main pipe 19222 is connected to the fire extinguishing agent spraying device 19221 and extends to the top of the battery compartment 310. Then, the fire extinguishing agent main pipe 19222 extends downward from the position corresponding to each column of battery cells 112 at the top of the battery compartment 310 to form a fire extinguishing agent branch pipe 19223 corresponding to each battery cell 112. Each fire extinguishing agent branch pipe 19223 is connected to a partition valve 19224 for controlling the on and off of the fire extinguishing agent branch pipe 19223, so as to control the fire extinguishing agent branch pipe 19223 to spray or stop spraying the fire extinguishing agent to the corresponding battery cell 112. The partition valve 19224 can be controlled by the fire control unit 1913.

[0115] The water outlet of the water injection assembly 1923 is connected to the battery compartment 310. Figure 6In the figure, the water injection assembly 1923 is shown to include a water injection pipe 19231, which extends from the outside of the battery compartment 310 through the hole on the wall of the battery compartment 310 to the inside of the battery compartment 310, and is arranged so that its water outlet is arranged near the top, located above each of the battery cells 112. The water injection pipe 19231 is provided with a valve outside the battery compartment 310, such as an electric ball valve 19232 that can be manually and electrically controlled, which is used to control the water injection pipe 19231 to inject water into the battery compartment 310 to extinguish the fire by flooding. 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, such as a fire hydrant, through a fire water pipe. In some embodiments, the box body 300 can be arranged close to the fire water source to facilitate water injection. When gas fire fighting cannot control the spread of thermal runaway, fire fighting water will be used to fill the entire tank, immerse the original vehicle battery pack 111 in thermal runaway in water, and quickly control the fire.

[0116] In some embodiments, the fire control unit 1913 may have a fire strategy, determine the severity of the fire according to the detection data of the detection unit 1911, make a corresponding alarm through the alarm unit 1912, and can choose to enable 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.

[0117] In some embodiments, Figure 7 As 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 on / off of the partition valve and the start and stop of the fire extinguishing agent spraying device 19221. The water injection fire extinguishing controller 19132 is connected to the gas fire extinguishing controller 19131 for communication, and the water injection fire extinguishing controller 19132 is connected to and controls the opening and closing of the electric ball valve 19232.

[0118] The fire fighting strategy of the fire fighting control unit 1913 in the embodiment of the present disclosure may determine the severity of the fire according to the following logic.

[0119] First, the fire control unit 1913 responds to the first fire alarm signal of any detector in the warehouse-level detection component and the battery-level detection component, and activates the alarm unit 1912 to alarm. Specifically, when any detector of the detection unit 1911 (which can be a detector of the warehouse-level detection component or a detector of the battery-level detection component) detects data abnormality 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 the combustible gas concentration reaches the threshold), the exhaust unit 1921 can be used to exhaust the gas for explosion prevention.

[0120] 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.

[0121] 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.

[0122] After the fire extinguishing device is started, the fire control unit 1913 can select further actions based on the feedback information of the fire extinguishing device startup. For example, if there is thermal runaway after spraying, it is necessary to start the water injection component 1923 (such as the water injection fire extinguishing controller 19132 electrically turned on or the ball valve 19232 manually turned on for water injection). In some embodiments, the feedback information may include data for determining whether the thermal runaway condition is met, such as the high temperature that continues after the fire extinguishing agent is sprayed. As an example, after receiving the fire extinguishing device startup signal, the temperature of the temperature detector reaches a first threshold (such as 80°C) and is maintained for more than a first time period (such as 10 minutes), or reaches a higher second threshold (such as 130°C) and is maintained for more than a shorter second time period (such as minutes), or the temperature detector or composite fire detector 19111 is offline and the high temperature (such as reaching the first threshold) is within the third time period (such as 10 minutes) before the offline, which will trigger the water injection fire extinguishing controller 19132 to start water injection. In addition, the water injection fire extinguishing control unit can make a higher level alarm based on the alarm unit 1912, such as coordinated alarms through sound and light alarms inside and outside the battery compartment 310, deflation indicator lights, etc.

[0123] Based on the above multi-level alarm fire fighting strategy, a fire fighting plan at the battery unit 112 level and a warehouse-level fire fighting plan corresponding to the battery warehouse 310 and the electrical warehouse 320 can be implemented.

[0124] The battery unit 112-level fire protection scheme can realize the automatic control and independent fire extinguishing of the original vehicle battery pack 111 that has caught fire, and has the function of zoned operation, zoned sensing, and zoned starting. When a fire occurs, the composite fire detector 19111 generates the first alarm signal, reports to the gas fire extinguishing controller 19131, and starts the sound and light alarm to alert the personnel in the protection area. After more than two composite fire detectors 19111 send out the second-level alarm signal, directly open the battery explosion-proof valve of the abnormal battery pack that has caught fire, and report to the gas fire extinguishing controller 19131 at the same time, start the fire extinguishing device, and the fire extinguishing agent is sprayed in the abnormal battery pack through the fire extinguishing agent branch pipe 19223 to extinguish the fire and cool down. The gas fire extinguishing controller 19131 will send the signal for starting the fire extinguishing device to the water injection fire extinguishing controller 19132. The water injection fire extinguishing controller 19132 determines that the thermal runaway conditions are met based on the detected temperature data and starts water injection.

[0125] The warehouse-level fire protection plan is also implemented according to the three-level warning.

[0126] Level 1 warning: If any detector in the box 300 sends out the first fire alarm information, the fire control unit 1913 (such as the gas fire extinguishing control unit) will give a warning prompt through the sound and light alarm of the alarm unit 1912. If the combustible gas detector 19113 alarms, the exhaust unit 1921 will be linked to open. Other linkage logics such as shunt trip signal output, fire alarm, fault signal output, etc. can be customized according to actual requirements.

[0127] Secondary fire alarm - after receiving an alarm from another detector in the same protection zone, that is, two or more detectors in the same protection zone form a second fire alarm signal, the fire control unit 1913 (such as the gas fire extinguishing control unit) will send a linkage signal to shut down the fan and electric shutters, and then send a linkage trigger signal to the fire extinguishing device. After the fire extinguishing device is triggered for 30S, the fire extinguishing agent spraying will be started.

[0128] Level 3 fire alarm: When the fire control unit 1913 (such as the water injection fire extinguishing control unit) receives the start feedback signal from the fire extinguishing device, it can issue an alarm through the internal sound and light alarm inside the box 300, the external sound and light alarm outside the box 300, and the deflation indicator light. If the thermal runaway condition is met, the fire control unit 1913 starts the ball valve 19232 to inject water to extinguish the fire.

[0129] like Figure 8 , which shows a schematic diagram of the structure of a computer device in one embodiment of the present disclosure.

[0130] The computer device 700 includes a bus 701, a processor 702, and a memory 703. The processor 702 and the memory 703 can communicate with each other through the bus 701. The memory 703 can store a computer program or instruction. The processor 702 implements the battery management method of the EMS in the previous embodiment by running the computer program or instruction in the memory 703, for example Figure 4A .

[0131] The bus 701 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of representation, although only one thick line is used in the figure, it does not mean that there is only one bus or one type of bus.

[0132] In some embodiments, the processor 702 may be implemented as a central processing unit (CPU), a microprocessing unit (MCU), a system on chip (System On Chip), or a field programmable logic array (FPGA). The memory 703 may include a volatile memory (Volatile Memory) for temporary storage of data when running a program, such as a random access memory (Random Access Memory, RAM).

[0133] The memory 703 may also include a non-volatile memory (non-volatile memory) for data storage, such as a read-only memory (ROM), a flash memory, a hard disk drive (HDD), or a solid-state disk (SSD).

[0134] In some embodiments, the computer device 700 may further include a communicator 704. The communicator 704 is used to communicate with the outside. 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, near field communication (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. One or more.

[0135] In an embodiment of the present disclosure, a computer-readable storage medium may be provided, storing a computer program or instruction, wherein the computer program or instruction is executed to implement the battery management method in the previous embodiment, such as Figure 4A .

[0136] 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 are implemented as computer code originally stored in a remote recording medium or a non-temporary machine-readable medium downloaded via a network and to be stored in a local recording medium, so that the method represented herein can be stored in 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).

[0137] In the embodiments of the present disclosure, a computer program product may be provided, one or more computer programs or instructions, which, when executed, fully or partially execute the battery management method in the embodiments of the present disclosure, etc. The computer program product includes one or more computer programs or instructions.

[0138] The computer program or instructions may 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 may be transmitted from one website, computer, server or data center to another website, computer, server or data center by wired or wireless means. The readable storage medium may be any available medium that can be accessed or a data storage device such as a server, data center, etc. that integrates one or more available media. The available medium may be a magnetic medium, such as a floppy disk, a hard disk, or a magnetic tape; it may also be an optical medium, such as a digital video disk; it may also be a semiconductor medium, such as a solid state drive. The computer readable storage medium may be a volatile or non-volatile storage medium, or may include both volatile and non-volatile types of storage media.

[0139] In summary, the present disclosure relates to new energy, and provides a battery management method, an energy management system, and an energy storage system. The method includes: the energy management system forms a communication line connection with the battery management system; the energy management system simulates the original vehicle battery pack in the actual vehicle operating environment to communicate and interact with the battery management system, so as to obtain the battery operating parameters of the original vehicle battery pack from the battery management system in real time, and perform charging and discharging of the energy storage unit through the energy storage converter unit based on the energy scheduling strategy. Thus, by simulating the operating environment through the energy management system, the energy storage system can be constructed using redundant original vehicle battery packs, solving the maintenance cost problem of redundant original vehicle battery packs and effectively supporting the consumption of new energy and power supply.

[0140] The above embodiments are merely illustrative of the principles and effects of the present disclosure, and are not intended to limit the present disclosure. Anyone familiar with the technology may modify or change the above embodiments without violating 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 in the present disclosure shall still be covered by the protection scope of the present disclosure.

Claims

1. A battery management method, characterized in that: An energy management system applied to an energy storage system, the energy storage system comprising an energy storage unit, the energy storage unit being constructed based on an original vehicle battery pack for a new energy vehicle, the original vehicle battery pack comprising a battery management system; the method comprising: The energy management system is connected with the battery management system through a communication line; The energy management system simulates the original vehicle battery pack in the actual vehicle operating environment to communicate and interact with the battery management system, so as to obtain the battery operating parameters of the original vehicle battery pack from the battery management system in real time, and execute the charging and discharging of the energy storage unit through the energy storage conversion unit based on the energy scheduling strategy.

2. The battery management method according to claim 1, characterized in that: The energy management system forms a communication line connection with the battery management system through an adapter from a preset communication interface to a CAN interface.

3. The battery management method according to claim 1, characterized in that: The battery operating parameters of the energy storage unit include at least one of: battery cell temperature, battery cell voltage, battery cell current, bus temperature, state of charge, health, battery energy / power adjustable depth, fault level, high-voltage interlock information, communication status, etc.

4. The battery management method according to claim 1, characterized in that: Also includes: The battery management system detects in real time the operating parameters of each battery cell in the original vehicle battery pack and the battery pack temperature, and limits the working conditions of the battery cells to within the safe working area accordingly; The energy management system determines whether the energy storage system is operating under normal conditions based on the battery operating parameters obtained from the battery management system; if not, the energy storage system is disconnected from the connected external power grid.

5. The battery management method according to claim 1, characterized in that: The energy storage unit is connected to the AC busbar via the energy storage converter unit; the AC busbar forms a plurality of power supply branches; an AC switch unit is provided in the AC busbar and the power supply branches; the energy management system is communicatively connected to a programmable logic controller, and the programmable logic controller is connected to each of the AC switch units; The battery management method comprises: The energy management system instructs the programmable logic controller to control the on / off of each of the AC switch units; And, when a failure of the energy management system is detected, the programmable logic controller turns off the designated AC switch unit.

6. The battery management method according to claim 5, characterized in that: The original vehicle battery pack is connected to the energy storage converter unit via a DC switch unit; The programmable logic controller is connected to each of the DC switch units; The battery management method comprises: The energy management system instructs the programmable logic controller to control the on / off of each of the DC switch units; And, when a fault in the energy management system is detected, the programmable logic controller turns off a designated DC switch unit.

7. The battery management method 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 power grid in the power consumption scenario where the energy storage system is located is restricted, the energy storage unit is discharged according to the power requirements that need to be met in the power consumption scenario; when the discharge power is greater than the load power of the external load in the power consumption scenario, the reverse flow output of the energy storage unit to the upstream external power grid is restricted; 3) The energy storage unit is coupled to an AC bus via an energy storage converter unit; 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 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 battery management method according to claim 1, characterized in that: The energy management system is communicatively connected with the cloud platform monitoring system, and the battery management method includes: The energy management system sends the operating status data of the energy storage system to the cloud platform monitoring system for display; or receives the user remote control instructions issued by the cloud platform monitoring system and executes corresponding control actions.

9. An energy management system, characterized in that: include: Communicator, processor and memory; The memory stores computer programs or instructions; The processor is used to run the computer program or instruction to execute the battery management method according to any one of claims 1 to 8.

10. An energy storage system, characterized in that: Comprising one or more energy management systems as claimed in any one of claims 1 to 9.

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