Electrochemical energy storage system

Abstract

The utility model relates to an electrochemical energy storage system, and relates to the technical field of electrochemical energy storage. The system comprises a battery cell unit, a battery management unit and a converter, wherein the battery cell unit comprises a first battery cell unit and a second battery cell unit; the battery management unit is used for detecting battery cell state information of the battery cell unit; the first cell units and the second cell units are connected in parallel to form parallel battery packs, a plurality of parallel battery packs are connected in series to form a battery cluster, and the converter is connected in series with the battery cluster. According to the system, the system cost is reduced, the energy conversion efficiency of the system is improved, the charge and discharge balance of the battery cell is ensured, the service life of the battery is prolonged, and the safety of the battery is improved.

Description

Technical Field

[0001] The present application relates to the technical field of electrochemical energy storage, and in particular to an electrochemical energy storage system. Background Art

[0002] At present, conventional large-scale electrochemical energy storage systems are equipped with multiple energy storage cells in order to increase the energy storage capacity. The multiple energy storage cells are generally connected in series to form a high-voltage battery cluster, and then connected in parallel after current limiting by a DC / DC (Direct Current / Direct Current) converter to a PCS (Power Conversion System) to perform charging and discharging based on the control of the energy storage converter. At the same time, each high-voltage battery cluster needs to be equipped with a BMS (Battery Management System) to manage the entire cluster of batteries, and the DC / DC converter is used to independently adjust the charge and discharge current of each battery pack. The large number of BMS and DC / DC converters arranged in the electrochemical energy storage system that first connects the energy storage cells in series and then in parallel increases the system cost. At the same time, due to the energy conversion loss in the DC / DC conversion process, the energy conversion efficiency of the system is reduced.

[0003] In order to reduce system costs and improve system energy conversion efficiency, related technologies provide another electrochemical energy storage system, which first connects energy storage cells in parallel and then connects them in series for use. However, since multiple energy storage cells cannot be completely consistent, directly connecting the cells in parallel will lead to unbalanced charging and discharging between the energy storage cells. At the same time, when a short circuit occurs inside an energy storage cell, other energy storage cells connected in parallel with it will discharge a large current to the short-circuit point of the short-circuited energy storage cell, aggravating the short-circuit fault and posing safety hazards such as cell fires.

[0004] Currently, no effective solution has been proposed for the problems of high system cost and low system energy conversion efficiency in the electrochemical energy storage system in which the energy storage cells are connected in series first and then in parallel, as well as the problems of unbalanced charging and discharging between cells, low battery life and safety in the electrochemical energy storage system in which the energy storage cells are connected in parallel first and then in series. Utility Model Content

[0005] An electrochemical energy storage system provided by an embodiment of the utility model at least solves the problem existing in the electrochemical energy storage system in the related art that it is impossible to balance reducing system cost, improving system energy conversion efficiency, ensuring charge and discharge balance of energy storage cells, and improving battery life and battery safety.

[0006] In order to solve the above problems, one aspect of the embodiments of the present utility model provides an electrochemical energy storage system, including a battery cell unit, a battery management unit and a converter; wherein:

[0007] The battery cell unit includes a first battery cell unit and a second battery cell unit, the first battery cell unit includes a battery cell, a switch connected in series with the battery cell, and a current detector, and the second battery cell unit includes a battery cell and a current detector connected in series with the battery cell;

[0008] The battery management unit is used to detect the battery status information of the battery unit and control the closing and opening of the switch in the battery unit;

[0009] The first battery cell unit and the second battery cell unit are connected in parallel to form a parallel battery group, and a plurality of parallel battery groups are connected in series to form a battery cluster;

[0010] The inverter is connected in series with the battery cluster.

[0011] In some of the embodiments, the switch in the first battery cell unit is connected in series with the negative electrode of the battery cell.

[0012] In some of the embodiments, the switch in the first battery cell unit is connected in series with the positive electrode of the battery cell.

[0013] In some of the embodiments, the number of battery management units is consistent with the number of battery cell units, and each battery management unit is used to detect the battery cell status information of a corresponding battery cell unit.

[0014] In some of the embodiments, the number of battery management units is consistent with the number of parallel battery packs, and the battery management units are used to detect the cell status information of all the cell units in the parallel battery packs.

[0015] In some of the embodiments, a communication connection is established between the converter and the battery management unit to transmit the cell status information and the switching status of the switch.

[0016] In some of the embodiments, a communication connection in the form of an isolated CAN or a daisy chain is established between the multiple battery management units.

[0017] The beneficial effects of the embodiments of the utility model: an electrochemical energy storage system including a battery cell unit, a battery management unit and an inverter is provided, wherein the battery cell unit includes a first battery cell unit and a second battery cell unit, the first battery cell unit includes a battery cell, a switch connected in series with the battery cell and a current detector, and the second battery cell unit includes a battery cell and a current detector connected in series with the battery cell; the battery management unit is used to detect the battery cell status information of the battery cell unit and control the closing and opening of the switch in the battery cell unit; the first battery cell unit and the second battery cell unit are connected in parallel to form a parallel battery group, and multiple parallel battery groups are connected in series to form a battery cluster; the inverter is connected in series with the battery cluster. The present invention overcomes the technical problems of high system cost and low system energy conversion efficiency caused by the need to use more BMS and DC / DC converters in the electrochemical energy storage system in the related art where the energy storage cells are connected in series first and then in parallel. The present invention also overcomes the problem of unbalanced charging and discharging between the energy storage cells caused by direct parallel connection of the cells in the electrochemical energy storage system in the related art where the energy storage cells are connected in parallel first and then in series. At the same time, when a short circuit occurs inside an energy storage cell, other energy storage cells connected in parallel with it will discharge a large current to the short-circuit point of the short-circuited energy storage cell, aggravating the short-circuit failure and resulting in the problem of low battery service life and safety. The utility model adopts a topology in which the battery cells are connected in parallel first and then in series, and the parallel battery cells include both a first battery cell unit with a switch in series and a second battery cell unit without a switch in series, thereby realizing a clamping circuit formed by the second battery cell unit in the parallel battery pack, limiting the terminal voltage of the first battery cell unit, and avoiding the situation in which the load reverse voltage is reloaded on the switch device when the branches corresponding to the first battery cell units are disconnected at the same time, thereby achieving the problem of ensuring the service life and safety of the battery and ensuring the charge and discharge balance of the energy storage battery cells. At the same time, the battery cells in the embodiment of the utility model adopt a connection method in which they are connected in parallel first and then in series, which reduces the number of BMS and DC / DC converters, greatly reduces the system cost, improves the system energy conversion efficiency, and further expands the applicable scenarios of the electrochemical energy storage system.

[0018] Details of one or more embodiments of the present invention are set forth in the following drawings and description to make other features, objectives, and advantages of the present invention more readily apparent. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the utility model, and for ordinary technicians in this field, other embodiments can be obtained based on these drawings without creative work.

[0020] Figure 1 It is a topological schematic diagram of an electrochemical energy storage system in the related technology.

[0021] Figure 2 It is another topological schematic diagram of an electrochemical energy storage system in the related technology.

[0022] Figure 3 It is a topological schematic diagram of an electrochemical energy storage system according to an embodiment of the utility model.

[0023] Figure 4 This is a topological schematic diagram of an electrochemical energy storage system provided in yet another embodiment of the present utility model.

[0024] Figure 5 It is a schematic diagram of the main process of a control method for an electrochemical energy storage system according to an embodiment of the utility model.

[0025] Figure 6 Schematic diagram of the structure of the electronic device of this embodiment. DETAILED DESCRIPTION

[0026] Embodiments of the present embodiment will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present embodiment are shown in the accompanying drawings, it should be understood that the present embodiment can be implemented in various forms and should not be construed as being limited to the embodiments set forth herein, which are instead provided for a more thorough and complete understanding of the present embodiment. It should be understood that the drawings and embodiments of the present embodiment are only for exemplary purposes and are not intended to limit the scope of protection of the present embodiment.

[0027] Figure 1 It is a topological schematic diagram of an electrochemical energy storage system in the related technology. Figure 1 The related technology shown provides a topology of energy storage cells in series first and then in parallel, such as Figure 1 As shown, multiple energy storage cells in the electrochemical energy storage system are first connected in series to form a high-voltage battery cluster, and then connected in parallel to the PCS (Power Conversion System) after current limiting by a DC / DC (Direct Current / Direct Current) converter. Charging and discharging are performed based on the control of the energy storage converter. At the same time, each high-voltage battery cluster needs to be equipped with a BMS (Battery Management System) to manage the entire cluster of batteries, and the DC / DC converter is used to independently adjust the charge and discharge current of each battery pack. In this type of electrochemical energy storage system, since the energy storage cells adopt a series-first and parallel-later topology, a large number of BMSs and DC / DC converters are set, which increases the system cost. At the same time, due to the energy conversion loss in the DC / DC conversion process, the energy conversion efficiency of the system is reduced.

[0028] In order to reduce the system cost of the electrochemical energy storage system and improve the energy conversion efficiency of the electrochemical energy storage system, the related art also provides Figure 2 The topology of an electrochemical energy storage system shown in the figure is to first connect the energy storage cells in parallel, and then connect the multiple energy storage currents in parallel in series, and then connect the whole to the PCS energy storage inverter. However, since the energy storage cells themselves cannot be completely consistent, the direct parallel connection of multiple energy storage cells will cause the problem of unbalanced charging and discharging currents between the multiple energy storage cells. When the charging and discharging currents of some energy storage cells are too large, the life and safety of the electrochemical energy storage system are seriously affected. At the same time, when a situation such as a cell short circuit occurs inside a certain energy storage cell, other energy storage cells connected in parallel with it will discharge a large current to the short-circuit point of the energy storage cell, resulting in aggravated short-circuit faults, which can easily cause the cells to catch fire and endanger the safety of the electrochemical energy storage system.

[0029] In order to solve the above problems, the present invention provides an electrochemical energy storage system. Figure 3 and Figure 4 As shown, the electrochemical energy storage system mainly includes: a battery cell unit, a battery management unit and an inverter; wherein the battery cell unit includes a first battery cell unit and a second battery cell unit, the first battery cell unit includes a battery cell, a switch connected in series with the battery cell and a current detector, and the second battery cell unit includes a battery cell and a current detector connected in series with the battery cell; the battery management unit is used to detect the battery cell status information of the battery cell unit and control the closing and opening of the switch in the battery cell unit; the first battery cell unit and the second battery cell unit are connected in parallel to form a parallel battery group, and multiple parallel battery groups are connected in series to form a battery cluster; the inverter is connected in series with the battery cluster.

[0030] Among them, the battery cells in the electrochemical energy storage system provided by the embodiment of the utility model adopt a topology of first parallel and then series connection, which reduces the additional system cost caused by the arrangement of more BMS and DC / DC converters in the topology of first series and then parallel connection of the battery cells in the related art, and directly connects the battery cluster that is first parallel and then series connection to the inverter, avoiding the loss of energy conversion efficiency of the system caused by the use of DC / DC converters, thereby improving the energy conversion efficiency of the system.

[0031] At the same time, in the electrochemical energy storage system provided by the embodiment of the utility model, the battery management unit is used to detect the cell status information of the battery cells in the battery cell unit, and controls whether the battery cells are connected to the electrochemical energy storage system by controlling the closing and opening of the switch. When a battery cell encounters a fault such as a short circuit, the faulty battery cell can be isolated by disconnecting the switch connected in series with the faulty battery cell, thereby avoiding affecting the electrochemical energy storage system and improving the life and safety of the electrochemical energy storage system.

[0032] Specifically, the cell status information includes the voltage information, current information and temperature information of the cell. One end of the battery management unit (BMU) is directly connected to the switch to control the closing and opening of the switch; one end is connected to the two ends of the current detector respectively, and the charging and discharging current of the cell is detected by real-time acquisition of the voltage at both ends of the current detector R; another end is connected to the positive and negative poles of the cell respectively to detect the cell voltage; the battery management unit can also detect the temperature of the cell. By comparing the collected voltage information, current information and temperature information (these three cell status indicators) with the preset cell status information, it can be determined whether the cell is faulty.

[0033] At the same time, the parallel battery group in the battery cluster provided by the embodiment of the utility model is formed by connecting a first battery cell unit provided with a switch in parallel with a second battery cell unit not provided with a switch, so as to realize the formation of a clamping circuit through the second battery cell unit in the parallel battery group, so that the maximum voltage of the first battery cell unit does not exceed the maximum voltage corresponding to the second battery cell unit, further ensuring the safety of the electrochemical energy storage system. On the other hand, through the voltage clamping function of the second battery cell unit, the withstand voltage level requirements of the switch connected in series with other parallel batteries can be reduced, thereby further reducing the system cost. And the above-mentioned clamping circuit limits the terminal voltage of the first battery cell unit to avoid the situation where the load reverse voltage is reloaded on the switch when the branches corresponding to the first battery cell unit are disconnected at the same time, thereby achieving the problem of ensuring the battery life and battery safety, and ensuring the charge and discharge balance of the battery cell.

[0034] In some of the embodiments, the current detector and the switch in the first battery cell unit are connected in series with the negative electrode of the battery cell in sequence; the number of battery management units is consistent with the number of battery cell units, and each battery management unit is used to detect the battery status information of a corresponding battery cell unit.

[0035] like Figure 3 As shown, the current detector and the switch in the first cell unit are connected in series with the negative electrode of the cell in sequence, and the current detector in the second cell unit is connected in series with the negative electrode of the cell, and each cell unit corresponds to a battery management unit (BMU, Battery Management Unit, battery management unit), that is, each cell unit is configured with a corresponding battery management unit, and the cell state information of the cell unit is used to timely and accurately determine the cell state of the cell, thereby facilitating management. The BMU controls the closing and opening of the switch K according to whether the cell state information (charging and discharging current value, voltage value, cell temperature) of the cell meets the set target requirements (i.e., the preset cell state information), and notifies the PCS (converter) to adjust the charging and discharging current of the entire battery cluster, and finally achieves the purpose of controlling the charging and discharging current of each cell within the specified range, and avoiding the effect of overcurrent in the charging and discharging of the cell.

[0036] According to a specific implementation of the utility model, the switch in the first battery cell unit is connected in series with the positive electrode of the battery cell; the number of battery management units is consistent with the number of battery cell units, and each battery management unit is used to detect the battery cell status information of a corresponding battery cell unit.

[0037] This specific implementation method and Figure 3 The difference shown is that the switch is connected in series with the positive pole of the battery cell, not the negative pole. When a battery cell in a first battery cell unit fails, when the switch is disconnected, the negative poles of multiple batteries in the same parallel battery pack are still connected together.

[0038] According to a specific embodiment of the utility model, when the switch in the first battery cell unit is connected in series with the negative electrode of the battery cell, the number of battery management units is configured to be consistent with the number of parallel battery groups in the electrochemical energy storage system, and the battery status information of all battery cells in a parallel battery group is detected by one battery management unit.

[0039] Through the above arrangement, in addition to realizing independent control of the switch corresponding to each battery cell unit, the number of battery management units required to be arranged is effectively reduced, thereby effectively reducing the system cost.

[0040] In some of the embodiments, the switch in the first battery cell unit is connected in series with the positive electrode of the battery cell, the number of battery management units is configured to be consistent with the number of parallel battery groups in the electrochemical energy storage system, and the battery status information of all battery cells in a parallel battery group is detected by one battery management unit.

[0041] like Figure 4 As shown, in the first battery cell unit, the current detector is connected in series with the negative electrode of the battery cell, and the switch is connected in series with the positive electrode of the battery cell. In the second battery cell unit, the current detector is connected in series with the negative electrode of the battery cell. One parallel battery pack corresponds to one battery management unit. The multiple sampling ports of the battery management unit are respectively connected to each battery cell unit in the parallel battery pack to detect the battery cell status information of each battery cell unit in the same parallel battery pack. Since the switch is connected to the positive electrode of the battery cell, when the switch is disconnected, the negative electrodes of the multiple batteries in the same parallel battery pack are still connected together. In this case, the multiple batteries in the same parallel battery pack can share one battery management unit. Through the above arrangement, while improving the system energy conversion efficiency, improving the battery life and battery safety, the system cost is further reduced because the number of battery management units required to be arranged is further reduced.

[0042] In some of the embodiments, a communication connection is established between the converter and the battery management unit to transmit the cell status information and the switching status of the switch.

[0043] Based on the received cell status information and the switching status of the switch, the converter can adaptively adjust the overall charging and discharging current value of the electrochemical energy storage system, thereby ensuring the stable operation of the electrochemical energy storage system.

[0044] In some of the embodiments, a communication connection in the form of an isolated CAN or a daisy chain is established between the multiple battery management units.

[0045] Through the above settings, multiple battery management units use isolated CAN (Controller Area Network, serial communication protocol) or daisy chain communication connections to achieve cascade communication between multiple battery management units. The communication method adopts a centralized architecture, which effectively reduces the communication cost of the battery management unit and improves the communication stability, so that the battery cell failure problem can be stably transmitted, further ensuring battery safety. At the same time, the above communication connection is established between multiple battery management units, and the battery cell status information of the corresponding battery cell units can be transmitted in time, which is helpful to coordinate the voltage balance of multiple batteries in the parallel battery pack, and can also timely determine whether to disconnect the switch based on abnormal battery cell status information, so as to ensure the overall operation stability of the electrochemical energy storage system.

[0046] The electrochemical energy storage system provided by the embodiment of the utility model adopts a topological mode of connecting the cells in parallel first and then in series, and the parallel cells include both a first cell unit with a switch in series and a second cell unit without a switch in series, thereby realizing a clamping circuit formed by the second cell unit in the parallel battery pack, limiting the terminal voltage of the first cell unit, and avoiding the situation where the load reverse voltage is reloaded on the switch device when the branches corresponding to the first cell units are disconnected at the same time, thereby achieving the problem of ensuring the service life and safety of the battery and ensuring the charge and discharge balance of the energy storage cell. At the same time, the cells in the embodiment of the utility model adopt a connection mode of connecting in parallel first and then in series, which reduces the number of BMS and DC / DC converters, greatly reduces the system cost, improves the system energy conversion efficiency, and further expands the applicable scenarios of the electrochemical energy storage system.

[0047] In order to solve the above problems, the present invention provides a control method for an electrochemical energy storage system, which is applied to any of the electrochemical energy storage systems provided in the above embodiments, such as Figure 5 As shown, the control method of the electrochemical energy storage system mainly includes:

[0048] Step S501 : Based on the communication connection between the battery management unit and the converter, the detected cell status information is sent to the converter via the battery management unit.

[0049] The cell status information includes at least one of the cell voltage information, current information and temperature information. The battery management unit provided by the embodiment of the utility model is used to detect the cell, realize the charge and discharge management of the cell, and improve the precision of system management. The failure of individual cells will only affect the available battery capacity of the system and will not cause the entire system to shut down. At the same time, there is no need to use a DC / DC module to manage the battery cluster, which reduces the system cost and improves the energy conversion efficiency.

[0050] The electrochemical energy storage system provided by the embodiment of the utility model adopts a topology in which the cells are connected in parallel first and in series, and the parallel cells include both a first cell unit with a switch in series and a second cell unit without a switch in series, thereby realizing a clamping circuit formed by the second cell unit in the parallel battery pack, limiting the terminal voltage of the first cell unit, and avoiding the situation in which the load reverse voltage is reloaded on the switch device when the branches corresponding to the first cell units are disconnected at the same time, thereby achieving the problem of ensuring the service life and safety of the battery and ensuring the charge and discharge balance of the energy storage cell. At the same time, the cell in the embodiment of the utility model adopts a connection method in which the cells are connected in parallel first and in series, which reduces the number of BMS and DC / DC converters, greatly reduces the system cost, improves the system energy conversion efficiency, and further expands the applicable scenarios of the electrochemical energy storage system. Based on the above electrochemical energy storage system, the battery management unit (BMU) is used to detect the battery cell status information such as voltage, current, temperature, etc. in real time, and the battery cell status information is sent to the converter, so that the converter can adjust the working parameters (such as working power, charging current value or discharging current value, etc.) based on the status of all battery cells. Based on the above settings, the safety of the electrochemical energy storage system is improved and the applicable scenarios of the electrochemical energy storage system are expanded.

[0051] In some of the embodiments, before the step of sending the detected cell status information to the inverter through the battery management unit, the method further includes: when responding to the startup of the electrochemical energy storage system, according to the series connection level of the parallel battery groups, closing the switches corresponding to the multiple parallel battery groups in the battery cluster step by step to achieve voltage balance of the multiple battery cells, and when all the battery cells in the battery cluster reach voltage balance, sending an operation instruction to the inverter through the battery management unit.

[0052] According to the embodiment of the utility model, when the electrochemical energy storage system is started, the switches in the battery cells of the same level are first closed (multiple battery cells connected in parallel in the same parallel battery pack are of the same level). Initially, there are voltage differences between multiple battery cells, and the battery cells with high voltage values ​​will discharge the battery cells with low voltage values. After a period of time, the battery cell voltage values ​​of multiple battery cells in the parallel battery pack are consistent. After the voltage balance is achieved, the switches in the battery cells of the next level are closed, until the switches corresponding to all battery cells are closed, and then the battery management unit sends an operation instruction to the converter to perform a discharge operation or a charging operation. The above-mentioned setting helps to ensure the voltage balance of multiple battery cells in the electrochemical energy storage system and improve the stability and safety of the electrochemical energy storage system.

[0053] According to a specific implementation of the embodiment of the utility model, when the above-mentioned electrochemical energy storage system is assembled, the battery cells connected in parallel at the same level are first connected in parallel, and the positive and negative electrodes of each battery cell are connected. At this time, the switches connected in series to each battery cell will be closed. At this time, due to the difference in battery cell voltages, the battery cell with a high voltage will discharge the battery cell with a low voltage. After a period of time, the voltages of the parallel battery cells are the same, and the battery cells at the same level complete voltage balancing. At this time, the parallel battery pack composed of the battery cells connected in parallel at the same level can be regarded as a battery cell with a larger capacity. In addition, because the voltages of the battery cells in the parallel battery pack are consistent, when the battery cell consistency is good, the charge and discharge currents of each battery cell are also the same.

[0054] Step S502: adjusting the operating parameters of the battery cluster according to the received cell status information by the energy storage converter.

[0055] In some of the embodiments, the method further comprises: comparing the detected cell status information with preset cell status information by the battery management unit to determine the faulty cell.

[0056] According to an embodiment of the utility model, the battery management unit BMU can determine the charging current value or discharging current value corresponding to each battery cell by detecting the voltage value on the current sensor R connected in series with each battery cell, obtain the battery cell voltage value by detecting the positive and negative poles of the battery cell, and obtain the battery cell temperature value. The battery cell status information thus obtained is compared with the preset battery cell status information to promptly detect a fault in a battery cell, and handle it in time to avoid safety accidents such as battery cell fire.

[0057] In some of the embodiments, after the step of determining the faulty battery cell, the method further includes: determining the battery cell unit type corresponding to the faulty battery cell; if the faulty battery cell corresponds to the second battery cell unit, sending battery cluster shutdown information to the inverter through the battery management system to shut down the battery cluster; if the faulty battery cell corresponds to the first battery cell unit, disconnecting the switch connected in series with the faulty battery cell through the battery management unit.

[0058] When the faulty battery cell belongs to the first battery cell unit, since the faulty battery cell is connected in series with a switch, the faulty battery cell can be isolated by simply turning off the corresponding switch.

[0059] In some of the embodiments, if the faulty battery cell corresponds to the first battery cell unit, the method further includes: determining the target parallel battery group corresponding to the faulty battery cell through the battery management unit to disconnect all switches in the target parallel battery group, and sending the switching status of the switch to the inverter so that the inverter adjusts the operating parameters of the battery cluster or suspends the operation of the battery cluster.

[0060] When a faulty cell has a short circuit, other cells connected in parallel will discharge a large current to the short-circuit point of the cell, aggravating the short circuit fault and causing the cell to catch fire, endangering the safety of the electrochemical energy storage system. When the faulty cell belongs to the second cell unit without a switch, all switches corresponding to multiple cells in the same parallel battery pack are turned off, and the switch status information of the switch is sent to the converter, so that the converter can adjust the working parameters of the battery cluster or suspend the operation of the battery cluster. After the fault is repaired, the corresponding switch is closed to resume the operation of the electrochemical energy storage system.

[0061] The control method of the electrochemical energy storage system provided in the embodiment of the utility model is applied to the electrochemical energy storage system in which the battery cells are connected in parallel first and then in series. While reducing the system cost and improving the system energy conversion efficiency, it improves the battery life and battery safety and ensures the current balance between the battery cells. By adopting a communication connection between the battery management unit and the converter, the detected battery cell status information is sent to the converter through the battery management unit; the operating parameters of the battery cluster are adjusted by the converter according to the received battery cell status information. The control effect of the electrochemical energy storage system is improved, and the operating stability and safety of the electrochemical energy storage system are guaranteed.

[0062] The embodiment of the utility model further provides an electronic device, comprising: at least one processor; and a memory connected to the at least one processor in communication. The memory stores a computer program executable by the at least one processor, and the computer program is used to enable the electronic device to execute the method of the embodiment of the utility model when executed by the at least one processor.

[0063] The embodiment of the utility model further provides a non-transitory machine-readable medium storing a computer program, wherein the computer program, when executed by a processor of a computer, is used to enable the computer to execute the method of the embodiment of the utility model.

[0064] The embodiment of the utility model further provides a computer program product, including a computer program, wherein when the computer program is executed by a processor of a computer, it is used to enable the computer to execute the method of the embodiment of the utility model.

[0065] refer to Figure 6 , the structural block diagram of an electronic device that can be used as a server or client of an embodiment of the utility model will now be described, which is an example of a hardware device that can be applied to various aspects of the utility model. Electronic devices are intended to represent various forms of digital electronic computer devices, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. Electronic devices can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the utility model described and / or required herein.

[0066] like Figure 6 As shown, the electronic device includes a computing unit 601, which can perform various appropriate actions and processes according to a computer program stored in a read-only memory (ROM) 602 or a computer program loaded from a storage unit 608 into a random access memory (RAM) 603. In the RAM 603, various programs and data required for the operation of the electronic device can also be stored. The computing unit 601, the ROM 602, and the RAM 603 are connected to each other via a bus 604. An input / output (I / O) interface 605 is also connected to the bus 604.

[0067] Multiple components in the electronic device are connected to the I / O interface 605, including: an input unit 606, an output unit 607, a storage unit 608, and a communication unit 609. The input unit 606 can be any type of device that can input information to the electronic device, and the input unit 606 can receive input digital or character information, and generate key signal input related to user settings and / or function control of the electronic device. The output unit 607 can be any type of device that can present information, and can include but is not limited to a display, a speaker, a video / audio output terminal, a vibrator, and / or a printer. The storage unit 608 can include but is not limited to a disk, an optical disk. The communication unit 609 allows the electronic device to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks, and can include but is not limited to a modem, a network card, an infrared communication device, a wireless communication transceiver, and / or a chipset, such as a Bluetooth device, a WiFi device, a WiMax device, a cellular communication device, and / or the like.

[0068] The computing unit 601 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the computing unit 601 include, but are not limited to, a CPU, a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, digital signal processors (DSPs), and any appropriate processors, controllers, microcontrollers, etc. The computing unit 601 performs the various methods and processes described above. For example, in some embodiments, the method embodiment of the utility model may be implemented as a computer program, which is tangibly contained in a machine-readable medium, such as a storage unit 608. In some embodiments, part or all of the computer program may be loaded and / or installed on an electronic device via a ROM 602 and / or a communication unit 609. In some embodiments, the computing unit 601 may be configured to perform the above method in any other appropriate manner (e.g., by means of firmware).

[0069] The computer program for implementing the method of the embodiment of the utility model can be written in any combination of one or more programming languages. These computer programs can be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor or controller, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program can be executed entirely on the machine, partially on the machine, partially on the machine as a stand-alone software package and partially on a remote machine, or entirely on a remote machine or server.

[0070] In the context of the utility model embodiment, machine-readable medium can be a tangible medium, which can contain or store a program for use by an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. Machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. Machine-readable signal medium can include but is not limited to electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or equipment, or any suitable combination of the above. More specific examples of machine-readable storage media can include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the above.

[0071] It should be noted that the term "including" and its variations used in the embodiments of the present invention are open inclusions, that is, "including but not limited to". The term "based on" means "based at least in part on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". The modifications of "one" and "multiple" mentioned in the embodiments of the present invention are illustrative and not restrictive. Those skilled in the art should understand that unless the context clearly indicates otherwise, it should be understood as "one or more".

[0072] The various steps described in the method implementation provided by the embodiment of the utility model can be performed in different orders and / or in parallel. In addition, the method implementation may include additional steps and / or omit the steps shown. The scope of protection of the utility model is not limited in this respect.

[0073] The term "embodiment" in this specification refers to specific features, structures or characteristics described in conjunction with the embodiment that can be included in at least one embodiment of the present utility model. The appearance of this phrase in various places in the specification does not necessarily mean the same embodiment, nor does it mean that it is mutually exclusive with other embodiments and is independent or optional. The various embodiments in this specification are described in a related manner, and the same or similar parts between the various embodiments refer to each other. In particular, for the device, equipment, and system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts refer to the partial description of the method embodiment.

[0074] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of patent protection. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the attached claims.

Claims

1. An electrochemical energy storage system, characterized in that: It includes a battery cell unit, a battery management unit and a converter; wherein, The battery cell unit includes a first battery cell unit and a second battery cell unit, the first battery cell unit includes a battery cell, a switch connected in series with the battery cell, and a current detector, and the second battery cell unit includes a battery cell and a current detector connected in series with the battery cell; The battery management unit is used to detect the battery cell status information of the battery cell unit and control the closing and opening of the switch in the battery cell unit; The first battery cell unit and the second battery cell unit are connected in parallel to form a parallel battery group, and a plurality of the parallel battery groups are connected in series to form a battery cluster; The converter is connected in series with the battery cluster.

2. The electrochemical energy storage system according to claim 1, characterized in that: The switch in the first battery cell unit is connected in series with the negative electrode of the battery cell.

3. The electrochemical energy storage system according to claim 1, characterized in that: The switch in the first battery cell unit is connected in series with the positive electrode of the battery cell.

4. The electrochemical energy storage system according to claim 1, characterized in that: The number of the battery management units is consistent with the number of the battery cell units, and each of the battery management units is used to detect the battery cell status information of a corresponding battery cell unit.

5. The electrochemical energy storage system according to claim 1, characterized in that: The number of the battery management units is consistent with the number of the parallel battery groups, and the battery management units are used to detect the cell status information of all the cell units in the parallel battery groups.

6. The electrochemical energy storage system according to claim 1, characterized in that: A communication connection is established between the converter and the battery management unit to transmit the cell status information and the switch status of the switch.

7. The electrochemical energy storage system according to claim 6, characterized in that: A communication connection in the form of an isolated CAN or a daisy chain is established between the multiple battery management units.

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