Battery management system, energy storage device and energy storage system

Abstract

The embodiment of the utility model provides a battery management system, an energy storage device and an energy storage system.The battery management system comprises a first controller, a second controller and multiple sets of battery samplers, and the first controller is connected with the second controller; at least one of the first controller and the second controller is connected with each group of battery samplers in the plurality of groups of battery samplers to form a loop, the battery samplers in each group of battery samplers are connected in series in the loop, the first controller is used for acquiring first data information of batteries corresponding to the plurality of groups of battery samplers, and the second controller is used for acquiring second data information of the batteries corresponding to the plurality of groups of battery samplers. The first data information comprises one or more of the following information: voltage information, current information and temperature information; the first controller is also used for managing the battery according to the first data information; and the second controller is used for determining the state information of the battery according to the first data information. The management control capability of the battery management system can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, more particularly, to a battery management system, an energy storage device and an energy storage system. BACKGROUND

[0002] Under the background of increasing support for the development of new energy technologies worldwide, various technologies related to energy storage have been widely applied. In order to meet the demand for large-capacity energy storage devices, the battery management system is needed to manage the battery. Therefore, how to effectively manage the battery through the battery management system is an urgent problem to be solved. CONTENT OF THE INVENTION

[0003] The embodiments of the present application provide a battery management system, an energy storage device and an energy storage system, which aims to improve the management and control capability of the battery management system by the first controller and the second controller in the battery management system for management and calculation respectively.

[0004] In the first aspect, the present application provides a battery management system, comprising a first controller, a second controller and a plurality of battery samplers, the first controller and the second controller are connected, at least one of the first controller and the second controller is connected with each battery sampler in the plurality of battery samplers and forms a loop, each battery sampler in each battery sampler is connected in series in the loop, the first controller is used to acquire first data information of the battery corresponding to the plurality of battery samplers, the first data information comprises one or more of the following information: voltage information, current information and temperature information; the first controller is further used to manage the battery according to the first data information; the second controller is used to determine the state information of the battery according to the first data information.

[0005] In the technical scheme of the embodiments of the present application, the first controller in the battery management system realizes the function of managing the battery, and the second controller realizes the function of calculation to obtain the state information of the battery, that is, through the two controllers, the battery can be controlled efficiently and flexibly. In addition, the controller can be connected with the plurality of battery samplers to sample the first data information of the plurality of battery clusters, and then control the plurality of battery clusters. The controller can improve the rate of data transmission by controlling the plurality of battery samplers to sample.

[0006] In some embodiments, the first controller is further used to send the first data information to the second controller; the second controller is used to determine the state information according to the first data information sent by the first controller.

[0007] In the technical scheme of the embodiment of the application, the first data information is sent to the second controller by the first controller to obtain the state information, the second controller shares the calculation function of the first controller, and efficient control of the battery management system can be realized.

[0008] In some embodiments, the battery management system further comprises a plurality of conversion chips, the plurality of conversion chips comprising a first conversion chip and a second conversion chip, each group of battery samplers in the plurality of groups of battery samplers connecting the controller through at least one conversion chip in the plurality of conversion chips to form a loop, the controller being connected with the plurality of conversion chips respectively, the plurality of conversion chips being configured to convert information between the first controller and / or the second controller and the battery samplers.

[0009] In the technical scheme of the embodiment of the application, the information transmission between the battery samplers and the first controller and / or the second controller needs to be completed through the conversion chips, in the application, a group of battery samplers in the plurality of battery samplers connects the controller through the conversion chips to form a loop, and then the information conversion between the battery samplers and the first controller and / or the second controller is realized.

[0010] In some embodiments, the plurality of conversion chips comprises a first conversion chip and a second conversion chip, a first group of battery samplers in the plurality of groups of battery samplers connecting the first controller through the first conversion chip and the second conversion chip to form a loop, the plurality of conversion chips being configured to receive and convert the first data information sent by the battery samplers; the plurality of conversion chips are further configured to send the first data information to the first controller; the first controller is configured to manage the battery according to the first data information, the management including at least one of the following: temperature management, overvoltage or undervoltage management, insulation management or overcurrent management.

[0011] In the technical scheme of the embodiment of the application, a group of battery samplers in the plurality of groups of battery samplers connects the first controller through the conversion chips to form a loop, that is, the first data information sampled by the battery samplers can be directly sent to the first controller through the conversion chips, and the first controller manages the battery according to the first data information.

[0012] In some embodiments, the first controller comprises a plurality of serial peripheral interfaces, and the first controller is connected with the plurality of conversion chips through the plurality of serial peripheral interfaces.

[0013] In the technical scheme of the embodiment of the application, the plurality of battery samplers are connected in series to form a daisy chain, and the first controller is allowed to access each battery sampler in each group of battery samplers in sequence in the daisy chain communication, and in the application, the serial peripheral interface can be used to easily realize the sequential control.

[0014] In some embodiments, the plurality of conversion chips comprises a first conversion chip and a second conversion chip, a first battery sampler in the plurality of battery samplers is connected to the second controller through the first conversion chip and the second conversion chip to form a loop, the plurality of conversion chips are configured to receive and convert first data information sent by the battery sampler, the plurality of conversion chips are further configured to send the first data information to the second controller, the second controller is further configured to send the first data information to the first controller, and the first controller is configured to manage the battery according to the first data information.

[0015] In the technical scheme of the embodiments of the present application, the conversion chip is connected to the second controller and sends the first data to the second controller, and the second controller forwards the first data information to the first controller to manage the battery.

[0016] In some embodiments, the second controller comprises a logic unit and a processing unit, the plurality of conversion chips are configured to send the first data information to the logic unit, the logic unit is configured to send the first data information to the first controller, and the first controller is configured to manage the battery according to the first data information.

[0017] In some embodiments, the first controller is further configured to send the first data information to the processing unit, and the processing unit is configured to determine state information of the battery according to the first data information.

[0018] In the technical scheme of the embodiments of the present application, the processing unit of the second controller can realize efficient and rapid calculation function, the first data information is sent to the processing unit, the state information of the battery can be calculated efficiently and rapidly, the control task of the first controller is shared, and the control and management capability of the entire battery management system is improved.

[0019] In some embodiments, the logic unit sends the first data information to the first controller through a high-speed serial interface.

[0020] In the technical scheme of the embodiments of the present application, the logic unit sends the first data information to the first controller through the high-speed serial interface, a plurality of serial peripheral interfaces of the logic unit can realize information sampling of a plurality of battery clusters, and in addition, the first data information can be transmitted to the first controller at high speed and accurately through the high-speed serial interface.

[0021] In some embodiments, the logic unit comprises a plurality of serial peripheral interfaces, and the plurality of conversion chips send the first data information to the logic unit through the plurality of serial peripheral interfaces.

[0022] The logic unit of the second controller can be extended with a plurality of serial peripheral interfaces, and the plurality of serial peripheral interfaces can be connected with a plurality of battery samplers to sample first data information of a plurality of battery clusters, so that the batteries can be managed.

[0023] In some embodiments, the plurality of conversion chips includes a third conversion chip, the third conversion chip includes a first interface and a second interface, the first interface is connected with a first group of battery samplers in the plurality of groups of battery samplers, the second interface is connected with a second group of battery samplers in the plurality of groups of battery samplers, and the first controller or the second controller is configured to receive first data information sent by the first group of battery samplers and the second group of battery samplers in parallel.

[0024] In the technical solution of the embodiments of the present application, the conversion chip can include two interfaces connected with two groups of battery samplers respectively, and the sampling data can be performed in parallel, so that the first data information can be sampled efficiently and quickly.

[0025] In some embodiments, the battery management system further includes an execution detector connected in series in each group of battery samplers, the execution detector is configured to obtain second data information and send the second data information to the first controller, and the second data information includes voltage or current of the battery management system; and the first controller is configured to control a switch of the execution detector to be opened according to the second data information.

[0026] In the technical solution of the embodiments of the present application, the execution detector is connected in series in the battery sampler, the voltage or current information of the entire battery management system is sampled, and after the second data information is sent to the first controller, the first controller controls the switch of the execution detector to be closed according to whether the voltage is overvoltage or the current is overcurrent.

[0027] In some embodiments, the second controller is further configured to report state information to a management regulator, and the management regulator is configured to control the switch of the execution detector to be closed according to the state information.

[0028] In the technical solution of the embodiments of the present application, the second controller reports the state information to the management regulator, and the management regulator can also control the switch of the detector to be closed.

[0029] In some embodiments, the second controller includes at least two Ethernet interfaces, and the Ethernet interfaces are configured to be connected with the management regulator.

[0030] In the technical solution of the embodiments of the present application, the second controller includes at least two Ethernet interfaces, which are configured to be connected with other non-serial peripheral interface management regulators, so as to realize a multi-compatible function.

[0031] In some embodiments, the first controller further comprises at least one controller area network (CAN) interface and at least one Ethernet interface, and the CAN interface and the Ethernet interface are configured to connect the plurality of battery samplers.

[0032] In the technical solution of the embodiments of the present application, the first controller comprises the CAN interface and the Ethernet interface in addition to the serial peripheral interface, and can be compatible with the battery samplers of the CAN interface and the Ethernet interface, thereby realizing the multi-compatible function.

[0033] In some embodiments, the first controller is connected to the second controller through the serial peripheral interface.

[0034] In the technical solution of the embodiments of the present application, the first controller is connected to the second controller through the serial peripheral interface, and high-efficiency data transmission can be realized.

[0035] In a second aspect, a power storage device is provided, which comprises a plurality of batteries and the battery management system of the first aspect or any one of the embodiments of the first aspect, and the battery management system is configured to manage or control the plurality of batteries.

[0036] In a third aspect, a power storage system is provided, which comprises a power conversion device and the power storage device of the second aspect or any one of the embodiments of the second aspect, and the power conversion device is configured to electrically connect a power generation device and the power storage device. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 An external appearance schematic diagram of the power storage device of the embodiments of the present application is shown.

[0038] Figure 2 An external appearance schematic diagram of the power storage device of the embodiments of the present application is shown.

[0039] Figure 3 An external appearance schematic diagram of the power storage device of the embodiments of the present application is shown.

[0040] Figure 4 An external appearance schematic diagram of the power storage device of the embodiments of the present application is shown.

[0041] Figure 5 An external appearance schematic diagram of the power storage device of the embodiments of the present application is shown.

[0042] Figure 6 An external appearance schematic diagram of the power storage device of the embodiments of the present application is shown.

[0043] Figure 7 An external appearance schematic diagram of the power storage device of the embodiments of the present application is shown.

[0044] Figure 8 A schematic diagram of still another battery management system provided by embodiments of the present application is shown.

[0045] Figure 9 A schematic diagram of an energy storage device provided by embodiments of the present application is shown. DETAILED DESCRIPTION

[0046] The embodiments of the present application will be further described in conjunction with the drawings and examples. The following detailed description of the examples and drawings is provided for the purpose of illustration only. The application is not limited to the examples described but only by the scope of the claims.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The description and drawings are to be regarded as illustrative in nature and embodiments of the application are not limited to the examples described. The description herein and the claims that follow use the terms "including" and "comprising" as encompassing both "including and of comprising" to the extent not using the term "consisting of".

[0048] The positional words appearing in the following description are the directions shown in the drawings, and are not intended to limit the specific structure of the present application. In the description of the present application, it should be further noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0049] Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in one embodiment" or "an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily all directed to the same embodiment, or to a single alternative embodiment. It is explicitly contemplated that embodiments described herein can be combined with each other.

[0050] "Multiple" appearing in the present application refers to two or more (including two), and similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0051] With the popularization and application of new energy such as solar energy and wind energy, energy storage technology develops accordingly, and the performance of the energy storage device has a great influence on the development thereof.

[0052] The energy storage device can include one or more batteries. The battery can include a box body and one or more battery cells encapsulated by the box body. The plurality of battery cells can be connected in series, in parallel, or in a hybrid connection, where the hybrid connection refers to a mixture of series and parallel connections. In the embodiments of the present application, the battery can also be referred to as a battery pack or a battery module or a battery module.

[0053] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc. The embodiments of the present application are not limited thereto. The battery cell can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc. The embodiments of the present application are not limited thereto.

[0054] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting, and at the same time, the active ions can pass through.

[0055] In some embodiments, the positive electrode can be a positive electrode tab, which can include a positive electrode current collector and a positive electrode active material arranged on at least one surface of the positive electrode current collector.

[0056] As an example, the positive electrode current collector can adopt a metal foil or a composite current collector. For example, as a metal foil, silver surface treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. can be adopted. The composite current collector can include a high polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a high polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0057] As an example, the positive electrode active material can include at least one of lithium-containing phosphates, lithium transition metal oxides, and modified compounds of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a battery positive electrode active material can also be used. These positive electrode active materials can be used alone only one or two or more can be used in combination. Among them, examples of the lithium-containing phosphate can include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (which can also be referred to as LFP)), a composite of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite of lithium manganese iron phosphate and carbon.

[0058] In some embodiments, the negative electrode can be a negative electrode tab, which can include a negative electrode current collector.

[0059] As an example, the negative electrode current collector can employ a metal foil or a composite current collector. For example, as a metal foil, silver surface-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, a carbon electrode, a carbon, nickel, or titanium, or the like can be employed. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, or the like) on a polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, or the like).

[0060] As an example, the negative electrode tab can include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0061] As an example, the negative electrode current collector has two surfaces opposite in the thickness direction thereof, and the negative electrode active material is disposed on either one or both of the two opposite surfaces of the negative electrode current collector.

[0062] As an example, the negative electrode active material can employ a negative electrode active material for a battery cell known in the art. As an example, the negative electrode active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, and the like.

[0063] In some embodiments, the negative electrode can employ a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, or the like. When the foamed metal is used as a negative electrode tab, the surface of the foamed metal can not be provided with a negative electrode active material, or of course can be provided with a negative electrode active material.

[0064] As an example, a lithium source material, which is lithium metal and / or a lithium-rich material, a potassium metal, or a sodium metal can also be filled and / or deposited in the negative electrode current collector.

[0065] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0066] In some embodiments, the electrode assembly further comprises a separator, which is arranged between the positive electrode and the negative electrode.

[0067] In some embodiments, the separator is a separator film. The type of the separator film is not particularly limited in the present application, and any known porous structure separator film with good chemical stability and mechanical stability can be selected.

[0068] For example, the main material of the separator film can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride, and ceramic.

[0069] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is arranged between the positive electrode and the negative electrode, and simultaneously functions as ion transmission and separation of the positive electrode and the negative electrode.

[0070] In some embodiments, the battery cell further comprises an electrolyte, which functions as ion conduction between the positive electrode and the negative electrode. The type of the electrolyte is not particularly limited in the present application, and can be selected according to the requirement. The electrolyte can be in a liquid state, a gel state, or a solid state.

[0071] In some embodiments, the electrode assembly is in a roll structure. The positive electrode sheet and the negative electrode sheet are rolled into the roll structure.

[0072] In some embodiments, the electrode assembly is in a stack structure.

[0073] For example, a plurality of positive electrode sheets and a plurality of negative electrode sheets can be arranged alternately.

[0074] For example, a plurality of positive electrode sheets can be arranged, and the negative electrode sheet is folded to form a plurality of folded segments arranged in layers.

[0075] For example, the positive electrode sheet and the negative electrode sheet are both folded to form a plurality of folded segments arranged in layers.

[0076] For example, a plurality of separators can be arranged between any adjacent positive electrode sheets or negative electrode sheets.

[0077] For example, the separators can be arranged continuously and arranged between any adjacent positive electrode sheets or negative electrode sheets by folding or rolling.

[0078] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0079] In some embodiments, the electrode assembly is provided with a tab, which can conduct current out of the electrode assembly. The tab includes a positive tab and a negative tab.

[0080] Generally, the same row or the same column of the battery in the energy storage device is divided into multiple battery clusters in parallel, and each battery cluster includes at least one battery. In the process of management and control of the battery management system on the multiple battery clusters, a three-level management architecture or a two-level management architecture can be included, wherein the three-level management architecture includes a total control unit, a master control unit and a data sampling unit, one total control unit and multiple master control units control multiple battery clusters, and the units interact through a controller area network interface (CAN). The wiring is complex and the transmission rate is slow. The two-level management architecture includes a master control unit and a data sampling unit, wherein one master control unit controls multiple data sampling units to sample data of multiple battery clusters. The master control unit can realize functions such as calculation, judgment and management, for example, power-on and power-off logic, fault diagnosis, control strategy, charge and discharge management, relay control, balance management, thermal management, data processing and storage, communication management and other related functions. At this time, one master control unit realizes both calculation function and judgment and management function, and the load is heavy. When sampling data of multiple battery clusters, the data transmission efficiency is low.

[0081] In order to alleviate the above problems, two master control units can be provided, the functions in the master control units are divided, different functions are realized by the two master control units, which can improve the management efficiency of the battery management system, and for large energy storage devices, high-speed sampling of data information of multiple battery clusters can be realized.

[0082] Based on the above considerations, the present application provides a battery management system, which includes a first controller, a second controller and multiple groups of battery samplers. The first controller and the second controller are connected, at least one of the first controller and the second controller is connected with each group of battery samplers and forms a loop, each battery sampler in each group of battery samplers is connected in series in the loop, the first controller is used to obtain first data information of the battery corresponding to the multiple groups of battery samplers, the first data information includes one or more of the following information: voltage information, current information and temperature information; the first controller is also used to manage the battery according to the first data information; the second controller is used to determine state information of the battery according to the first data information.

[0083] In the battery management system, two master control units, i.e., a first controller and a second controller, are designed, the first controller is used to manage the battery, and the second controller is used to calculate the state information of the battery. Through the two controllers, the control management efficiency of the battery management system can be effectively improved. In addition, in the application, the controller is connected with each battery sampler in the plurality of battery samplers and forms a loop, which is used for data sampling of the plurality of battery clusters, and multi-way communication between the controller and the battery cluster can be realized.

[0084] The technical solutions described in the embodiments of the application are suitable for various types and various sizes of energy storage devices. Exemplarily, the energy storage device can be an energy storage container or an energy storage cabinet. Considering the transportation of the energy storage container, the energy storage container can be a standard container of 40 feet, 20 feet or 10 feet, or can also be a specific container with a customized size. The batteries contained in the energy storage container include but are not limited to lithium batteries such as lithium iron phosphate batteries, lithium manganese batteries or lithium cobalt batteries, etc.

[0085] Figure 1 The energy storage device of the embodiments of the application is shown as an energy storage container.

[0086] As Figure 1 shown, the energy storage container 100 can be a regular cuboid structure, which is convenient for fixed placement and transportation of the energy storage container 100. The inside of the energy storage container 100 is a hollow structure, which can include a battery compartment to facilitate the arrangement of a battery rack in the battery compartment. In addition, in addition to the battery compartment, the inside of the energy storage container 100 can also be divided into a plurality of functional compartments according to actual needs, and each functional compartment is provided with other functional device components for managing or assisting the operation of the battery, such as busbar components, thermal management components, etc.

[0087] Figure 2 The energy storage device 200 of the embodiments of the application is shown as a schematic diagram. The energy storage device 200 can be, for example, the energy storage container 100 shown in Figure 1 , or can also be an energy storage cabinet. As Figure 2 shown, the energy storage device 200 can include a box body 210 and a plurality of batteries 221. The inside of the box body 210 is a hollow structure, and the plurality of batteries 221 are arranged in the hollow structure. The batteries 221 in the same row or the same column are divided into a plurality of battery clusters 220 in parallel, and each battery cluster 220 includes at least one battery 221.

[0088] In the embodiment of the present application, one row or one column of the batteries 221 is divided into a plurality of battery clusters 220, and the plurality of battery clusters 220 are connected in parallel. The arrangement of the battery clusters 220 can not only decompose a large-capacity energy storage device, but also make the size of the energy storage device 200 a standard size, thereby reducing the transportation cost of the energy storage device 200. That is, the embodiment of the present application is conducive to the standardization of the energy storage device 200 and the reduction of the transportation cost.

[0089] In the embodiment of the present application, one row or one column of the batteries 221 is divided into a plurality of battery clusters 220, and the plurality of battery clusters 220 are connected in parallel. The arrangement of the battery clusters 220 can not only decompose a large-capacity energy storage device, but also make the size of the energy storage device 200 a standard size, thereby reducing the transportation cost of the energy storage device 200. That is, the embodiment of the present application is conducive to the standardization of the energy storage device 200 and the reduction of the transportation cost.

[0090] The energy storage device 200 can include N columns of batteries 221, and each column of batteries 221 is divided into at least two battery clusters 220 connected in parallel, each battery cluster 220 includes at least one battery 221, and N is greater than or equal to 1.

[0091] Alternatively, the energy storage device 200 can include N rows of batteries 221, and each row of batteries 221 is divided into at least two battery clusters 220 connected in parallel, each battery cluster 220 includes at least one battery 221, and N is greater than or equal to 1.

[0092] In some embodiments, as shown in FIG. 2B, the plurality of batteries 221 can include four columns of batteries 221, each column of batteries 221 can be divided into two battery clusters 220 connected in parallel, each battery cluster 220 can include four batteries 221, and each battery 221 can include 104 battery monomers connected in series. Figure 2

[0093] In other words, the arrangement of the battery clusters 220 in the embodiment of the present application is a four-column eight-cluster arrangement, which can better decompose a large-capacity energy storage device of 6MWh.

[0094] Alternatively, the plurality of batteries 221 can include four rows of batteries 221, each row of batteries 221 can be divided into two battery clusters 220 connected in parallel, each battery cluster 220 includes four batteries 221, and each battery 221 includes 104 battery monomers connected in series.

[0095] ​Of course, the energy storage device 200 of the embodiments of the present application can also include other numbers of battery clusters 220. For example, the energy storage device 200 can also include 2 columns of batteries 221, and each column of batteries 221 can be divided into 4 battery clusters 220 in parallel. At this time, one battery cluster 220 can include 2 batteries 221, and each battery 221 can include 104 battery monomers connected in series. Alternatively, the energy storage device 200 can also include 1 column of batteries 221, and each column of batteries 221 can be divided into 8 battery clusters 220 in parallel. Alternatively, each column of batteries 221 can be divided into 3 battery clusters 220 in parallel.

[0096] It should be noted that the battery monomer of the embodiments of the present application can be a large-capacity battery monomer. For example, the capacity of one battery monomer can be greater than 300 Ah, such as 306 Ah, 314 Ah, 530 Ah, 580 Ah, 587 Ah, 600 Ah, 700 Ah, 1000 Ah, 1100 Ah, 1300 Ah, etc.

[0097] Figure 3 A schematic exploded view of the battery monomer 222 of one embodiment of the present application is shown.

[0098] As shown in Figure 3 , the battery monomer 222 includes one or more electrode assemblies 21, a shell 22, and an end cap assembly 23, wherein the wall of the shell 22 and the end cap assembly 23 are both walls of the battery monomer 222. The shell 22 is determined according to the shape of the combined one or more electrode assemblies 21, for example, the shell 22 can be a hollow cuboid or a square or a cylinder, and one of the faces of the shell 22 has an opening so that the one or more electrode assemblies 21 can be placed in the shell 22. For example, when the shell 22 is a hollow cuboid or a square, one of the planes of the shell 22 is an open plane, i.e., the plane does not have a wall so that the inside and outside of the shell 22 are in communication. When the shell 22 can be a hollow cylinder, the end face of the shell 22 is an open face, i.e., the end face does not have a wall so that the inside and outside of the shell 22 are in communication. The end cap assembly 23 covers the opening and is connected with the shell 22 to form a closed cavity for placing the electrode assembly 21. The shell 22 is filled with an electrolyte, such as an electrolyte solution.

[0099] The battery monomer 222 also includes two electrode terminals 214. The end cap assembly 23 is generally flat, and the two electrode terminals 214 are fixed on the flat face of the end cap assembly 23, and the two electrode terminals 214 are respectively a positive electrode terminal 214a and a negative electrode terminal 214b. Each electrode terminal 214 is respectively provided with a connecting member 24, which can also be referred to as a current collecting member, which is located between the end cap assembly 23 and the electrode assembly 21, and is used to electrically connect the electrode assembly 21 and the electrode terminal 214.

[0100] As shown in Figure 3As shown, each electrode assembly 21 has a first tab 211a and a second tab 212a. The first tab 211a and the second tab 212a have opposite polarities. For example, when the first tab 211a is a positive electrode tab, the second tab 212a is a negative electrode tab. The first tab 211a of one or more electrode assemblies 21 is connected to one electrode terminal 214 through one connecting member 24, and the second tab 212a of one or more electrode assemblies 21 is connected to another electrode terminal 214 through another connecting member 24. For example, when the first tab 211a is a positive electrode tab and the second tab 212a is a negative electrode tab, the positive electrode terminal 214a is connected to the first tab 211a through one connecting member 24, and the negative electrode terminal 214b is connected to the second tab 212a through another connecting member 24.

[0101] In the battery cell 222, the electrode assembly 21 can be arranged as a single electrode assembly or multiple electrode assemblies according to actual use requirements. Figure 3 As shown, four independent electrode assemblies 21 are arranged in the battery cell 222.

[0102] As an example, a pressure relief mechanism 213 can also be arranged on one wall of the battery cell 222. The pressure relief mechanism 213 is used to actuate to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 222 reaches a threshold value.

[0103] Optionally, the pressure relief mechanism 213 can be arranged on the end cover assembly 23 or any wall of the housing 22.

[0104] Figure 4 A schematic diagram of a battery management system 300 provided by an embodiment of the present application is shown.

[0105] According to some embodiments of the present application, referring to Figure 4 The present application provides a battery management system 300. The battery management system 300 includes a first controller 311, a second controller 312, and a plurality of battery samplers 320. The first controller 311 and the second controller 312 are connected. At least one of the first controller 311 and the second controller 312 is connected to each of the plurality of battery samplers 320 and forms a loop. Each battery sampler in each of the plurality of battery samplers 320 is connected in series in the loop. The first controller 311 is configured to acquire first data information of a battery corresponding to each of the plurality of battery samplers 320. The first data information includes one or more of the following information: voltage information, current information, and / or temperature information. The first controller 311 is further configured to manage the battery according to the first data information. The second controller 312 is configured to determine state information of the battery according to the first data information.

[0106] As Figure 4As shown, the head and tail battery samplers of each of the m groups of battery samplers 320 are connected with the controller 310 respectively to form a loop.

[0107] The battery samplers in each group of battery samplers 320 are connected in series, as shown. Figure 4 As an example, the battery samplers 1_1, 1_2, …, 1_n of one of the groups of battery samplers 320 are connected in series, and the battery sampler 1_1 and the battery sampler 1_n are connected with the controller 310 respectively to form a loop. This loop formed by the series connection can be referred to as a daisy chain communication loop. Since the components are connected in series, the daisy chain communication loop has fewer connection lines, simplifying the wiring process. In addition, data is transmitted in a certain order in the daisy chain, usually from the first device of the daisy chain to the last device.

[0108] The multiple groups of battery samplers 320 receive the sampling instruction sent by the first controller 311, sample the corresponding batteries respectively, and obtain the first data information of the corresponding batteries. For example, the battery samplers 1_1, 1_2, …, 1_n and the battery samplers 2_1, 2_2, …, 2_n receive the sampling instruction sent by the first controller 311, sample the corresponding batteries respectively, and obtain the first data information of the two groups of batteries.

[0109] For one of the groups of battery samplers 320, the battery samplers 1_1, 1_2, …, 1_n are connected with one of the multiple battery clusters, and more specifically, the battery samplers 1_1, 1_2, …, 1_n are connected with the battery a1, a2, …, an in the battery cluster A, and further sample to obtain the first data information of the multiple batteries; the battery samplers 1_1, 1_2, …, 1_n can also be connected with the battery monomers in the battery cluster A, and further sample to obtain the first data information of the multiple battery monomers.

[0110] It should be understood that any one of the multiple groups of battery samplers 320 can include one battery monomer sampler 320. As shown, Figure 4 It should be understood that any one of the multiple groups of battery samplers 320 can include one battery monomer sampler 320. As shown,

[0111] For the connection mode of the battery samplers 320 and the batteries, two lines are led out from the positive electrode of the battery, and two lines are led out from the negative electrode. Among them, the two lines of the positive electrode are connected with the battery samplers 320, which are used to sample the voltage information or current information of the battery, and the two lines of the negative electrode are connected with the battery samplers 320 through a thermistor, which is used to detect the temperature information of the battery.

[0112] The first controller 311 acquires the first data information and manages the battery, including at least one of the following: temperature management, overvoltage or undervoltage management, insulation management, or overcurrent management. Specifically, the first controller 311 manages the battery according to the first data information satisfying a preset condition. Taking temperature management as an example, the first controller 311 controls the battery to perform cooling processing according to the temperature information in the first data information being greater than a temperature preset condition, so that the battery temperature reaches a normal value.

[0113] The second controller 312 determines the state information of the battery according to the first data information, where the state information of the battery can include the state of charge (SOC), the state of health (SOH), the state of power (SOP), and the like.

[0114] The controller 310 can be an SBMU. When the controller 310 corresponds to multiple battery clusters, the controller 310 can be an MBMU.

[0115] The battery sampler 320 can be a cell supervision circuit (CSC). Each battery cluster can have multiple CSCs connected in series. One battery corresponds to one CSC to monitor the voltage information, current information, or temperature information of the battery cell or battery connected thereto. The sampling process of the battery sampler 320 can be one-way or two-way, which is not limited in the present application.

[0116] In the battery management system 300, the first controller 311 is used to manage the battery, and the second controller 312 is used to calculate the state information of the battery. That is, through the two controllers 310, the battery can be efficiently controlled. In addition, the controller 310 can be connected to multiple battery samplers 320 to sample the first data information of multiple battery clusters, and then control the multiple battery clusters. The controller 310 controls the sampling of multiple battery samplers 320, which can improve the management and control capability of the battery management system 300.

[0117] In some embodiments, the battery sampler 320 can only sample temperature information and voltage information. Since the battery samplers 320 in the daisy chain are connected in series, the current in one daisy chain is the same, so the current information of the battery can be obtained by connecting a current detection device in the daisy chain.

[0118] According to some embodiments of the present application, optionally, please continue to refer to Figure 4The first controller 311 is further configured to send the first data information to the second controller 312. The second controller 312 is configured to determine the state information according to the first data information sent by the first controller 311.

[0119] Specifically, in a case where the first controller 311 and each of the plurality of battery samplers 320 are connected and form a loop, and the first controller 311 and the second controller 312 are connected, the first controller 311 receives the first data information sent by the plurality of battery samplers 320, and sends the first data information to the second controller 312 to determine the state information.

[0120] In a case where the second controller 312 and each of the plurality of battery samplers 320 are connected and form a loop, and the first controller 311 and the second controller 312 are connected, the second controller 312 first receives the first data information sent by the plurality of battery samplers 320, and sends the first data information to the first controller 311. The first controller 311 manages the battery according to the first data information, and additionally sends the first data information to the second controller 312. The second controller 312 confirms the state information of the battery according to the first data information. The second controller 312 can select a chip based on a Field-Programmable Gate Array (FPGA), wherein the chip based on the FPGA has an Advanced RISC Machines (ARM) series high-performance processor and a real-time processor with functional safety certification inside. The second controller 312 adopts the chip based on the FPGA, which can expand more SPI interfaces to realize information sampling of more battery clusters. The first controller 311 sends the first data information to the second controller 312 for calculation to obtain the state information. The second controller 312 shares the calculation function of the first controller 311, and can realize efficient control of the battery management system 300.

[0121] Figure 5 A schematic diagram of another battery management system 300 provided by an embodiment of the application is shown.

[0122] According to some embodiments of the application, optionally, referring to Figure 5 The battery management system 300 further includes a plurality of conversion chips 330. Each of the plurality of battery samplers 320 is connected to a controller through at least one of the plurality of conversion chips 330 to form a loop. The controller 310 is connected to the plurality of conversion chips 330. The plurality of conversion chips 330 are configured to convert information between the first controller 311 and / or the second controller 312 and the battery sampler 320.

[0123] When the controller 310 sends the sampling instruction to the battery sampler 320 and the battery sampler 320 sends the first data information to the controller 310, the conversion of information or instruction is needed, for example, the sampling instruction needs to be converted into the instruction information that can be recognized by the battery sampler 320. As shown in Figure 5 The conversion chip 1 and the conversion chip m in the plurality of conversion chips 330 are connected with the battery sampler 1_1, the battery sampler 1_2, …, the battery sampler 1_n and the controller 310 to form a daisy chain communication loop, and the conversion chip 2 and the conversion chip m-1 in the plurality of conversion chips 330 are connected with the battery sampler 2_1, the battery sampler 2_2, …, the battery sampler 2_n and the controller 310 to form a daisy chain communication loop.

[0124] It should be understood that the two conversion chips in one daisy chain in the present application can be randomly combined, for example, the conversion chip 1 and the conversion chip 2 in the plurality of conversion chips 330 can be connected with the battery sampler 1_1, the battery sampler 1_2, …, the battery sampler 1_n and the controller 310 to form a daisy chain communication loop, and for another example, the conversion chip 1 and the conversion chip 3 in the plurality of conversion chips 330 can be connected with the battery sampler 1_1, the battery sampler 1_2, …, the battery sampler 1_n and the controller 310 to form a daisy chain communication loop.

[0125] The controller is connected by the conversion chip 330 through at least one group of battery samplers in the plurality of battery samplers 320 to form a loop, thereby realizing the conversion of information between the battery sampler 320 and the controller 310.

[0126] Figure 6 A schematic diagram of another battery management system 300 provided by an embodiment of the present application is shown.

[0127] According to some embodiments of the present application, optionally, referring to Figure 6 The plurality of conversion chips 330 includes a first conversion chip and a second conversion chip, a first group of battery samplers 320 in the plurality of groups of battery samplers 320 is connected with the first controller 311 through the first conversion chip and the second conversion chip to form a loop, the plurality of conversion chips 330 are used for receiving and converting the first data information sent by the battery sampler 320; the plurality of conversion chips 330 are also used for sending the first data information to the first controller 311; the first controller 311 is used for managing the battery according to the first data information, and the management includes at least one of the following: temperature management, overvoltage or undervoltage management, insulation management or overcurrent management.

[0128] The plurality of conversion chips 330 are connected with the first controller 311, that is, the first group of battery samplers 320 in the plurality of groups of battery samplers 320 are connected with the first controller 311 through the first conversion chip and the second conversion chip to form a daisy chain communication loop, at this time, the first controller 311 sends a sampling instruction to the battery samplers 320, the sampling instruction is sent to the battery samplers 320 after conversion through the conversion chip 330, the battery samplers 320 sample the data of the battery or the battery monomer to obtain first data information, and send the data information to the first controller 311, and the first controller 311 manages the battery according to the first data information, and the specific management process is the same as that in the above embodiment, which will not be described here again.

[0129] According to some embodiments of the present application, please continue to refer to Figure 6 The first controller 311 includes a plurality of serial peripheral interfaces (SPI), and the first controller 311 is connected with the plurality of conversion chips 330 through the plurality of SPI interfaces.

[0130] The first controller 311 can expand a plurality of SPI interfaces, for example, in the present application, the first controller 311 uses a microcontroller unit (MCU) that can expand a plurality of SPI interfaces, for example, an MCU of ARM Cortex-M type. In addition, the first controller 311 can select an MCU with a safety integrity level (SIL) of D level, which can meet the safety level requirement and can be used to efficiently judge and process the first data information.

[0131] By allowing the first controller 311 to sequentially access each battery sampler in each group of battery samplers 320 in the daisy chain communication loop in the present application, in the present application, the sequential control can be easily realized by using the SPI interface.

[0132] Figure 7 Another schematic diagram of a battery management system 300 provided by an embodiment of the present application is shown.

[0133] According to some embodiments of the present application, please continue to refer to Figure 7The plurality of conversion chips 330 includes a first conversion chip and a second conversion chip, a first battery sampler 320 in the plurality of battery samplers 320 is connected to the second controller 312 through the first conversion chip and the second conversion chip to form a loop, the plurality of conversion chips 330 are configured to receive and convert first data information transmitted by the battery samplers 320, and the plurality of conversion chips 330 are further configured to transmit the first data information to the second controller 312, and the second controller 312 is further configured to transmit the first data information to the first controller 311, and the first controller 311 is configured to manage the battery according to the first data information.

[0134] A battery sampler 320 in the plurality of battery samplers 320 is connected to the second controller 312 through the conversion chip 330 to form a daisy chain communication loop, and the second controller 312 can be a field programmable gate array (FPGA) based chip, which has a high-performance processor of an advanced reduced instruction set computer (RISC) machine (ARM) series and a real-time processor with functional safety certification. The second controller 312 uses the FPGA based chip to expand more SPI interfaces to realize information sampling of more battery clusters. The second controller 312 is described below by taking the FPGA based chip as an example.

[0135] According to some embodiments of the present application, the second controller 312 includes a logic unit and a processing unit, the plurality of conversion chips 330 are configured to transmit the first data information to the logic unit, the logic unit is configured to transmit the first data information to the first controller 311, and the first controller 311 is configured to manage the battery according to the first data information.

[0136] The FPGA based chip includes a logic unit and a processing unit, and the logic unit is configured to receive the first data information and forward the first data information to the first controller 311.

[0137] According to some embodiments of the present application, the first controller 311 is further configured to transmit the first data information to the processing unit, and the processing unit is configured to determine state information of the battery according to the first data information.

[0138] The processing unit in the FPGA based chip is configured to determine the state information of the battery according to the first data information. It should be understood that in this embodiment, the first data information is first transmitted to the logic unit, the logic unit transmits the first data information to the first controller 311, and then the first data information is transmitted to the processing unit to calculate the state information.

[0139] In some embodiments, the logic unit can directly send the first data information to the processing unit, and the processing unit obtains the state information of the battery through the first data information. The process of directly transmitting the first data information to the processing unit can improve the control efficiency of the controller 310.

[0140] According to some embodiments of the present application, the logic unit can optionally send the first data information to the first controller 311 through a high-speed serial link (HSSL).

[0141] The data transmission between the logic unit and the first controller 311 can achieve high-speed data transmission through HSSL. Then, the first controller 311 can send the sampling instruction to the logic unit through the HSSL interface, and the logic unit sends it to the battery sampler 320 for sampling. After sampling the first data information, it is sent to the logic unit. The logic unit sends the first data information to the first control unit 311 through the HSSL interface.

[0142] According to some embodiments of the present application, the logic unit includes a plurality of serial peripheral interfaces, and a plurality of conversion chips 330, which send the first data information to the logic unit through the plurality of serial peripheral interfaces.

[0143] The logic unit in the FPGA-based chip can expand more SPI interfaces. Since FPGA can process multiple tasks in parallel, it means that multiple SPI interfaces can be configured at the same time, and each interface can operate independently. In addition, FPGA usually has a large number of I / O pins, which can be configured as signal lines required by SPI interface. Therefore, FPGA can create multiple SPI interfaces as long as there are enough pins. Multiple SPI interfaces can be connected with multiple conversion chips 330 and multiple battery samplers 320 respectively to form multiple daisy chains, realizing the sampling of data of more battery clusters.

[0144] In some embodiments, the logic unit includes a plurality of SPI interfaces, and the first controller 311 also includes a plurality of SPI interfaces. The plurality of conversion chips 330 can send the first data information to the first controller 311 through the plurality of SPI interfaces of the first controller 311, and the plurality of conversion chips 330 can also send the first data information to the logic unit through the plurality of SPI interfaces of the logic unit, and then send the first data information to the first controller 311 through the HSSL interface.

[0145] According to some embodiments of the present application, optionally, the plurality of conversion chips 330 includes a third conversion chip 330, the third conversion chip 330 includes a first interface and a second interface, the first interface is connected with a first group of battery samplers in the plurality of groups of battery samplers 320, the second interface is connected with a second group of battery samplers in the plurality of groups of battery samplers 320, the first controller 311 or the second controller 312 is configured to receive first data information sent by the first group of battery samplers and the second group of battery samplers in parallel.

[0146] When the conversion chip 330 includes two interfaces, one conversion chip can be connected with two groups of battery samplers 320 respectively, compared with the conversion chip 330 having only one interface, the conversion chip 330 having two interfaces can receive first data information of more groups of battery samplers 320 at the same time, which can effectively improve the data transmission rate.

[0147] In some embodiments, when the third conversion chip 330 includes a first interface and a second interface, a first group of battery samplers 320 can be connected with the first interface and the second interface respectively to form a loop, and the third conversion chip 330 is connected with the controller 310 to form a loop.

[0148] Figure 8 Another schematic diagram of a battery management system 300 is shown.

[0149] According to some embodiments of the present application, optionally, referring to Figure 8 , the battery management system 300 further includes an execution detector, the execution detector is connected in series in each group of battery samplers 320, the execution detector is configured to obtain second data information and send the second data information to the first controller 311, the second data information includes voltage or current of the battery management system 300; the first controller 311 is configured to control the switch of the execution detector to be opened according to the second data information.

[0150] The number of execution detectors can be the same as the number of groups of battery samplers 320, that is, the execution detectors are connected in series in the loop formed by each group of battery samplers 320. For example, as shown in Figure 8 , the execution detector 1 is connected in series in the battery sampler 1_1, the battery sampler 1_2, …, and the battery sampler 1_n.

[0151] The execution detector comprises a high-voltage sampling module and a slave I / O device (SIO), wherein the high-voltage sampling module is configured to sample second data information and send the second data information to the controller 310, and the first controller 311 in the controller 310 controls the opening and closing of the relay in the SIO in the execution detector according to the second data information. The high-voltage sampling module can be a battery junction box (BJB).

[0152] The execution detector receives the sampling instruction sent by the first controller 311, and samples second data information according to the instruction information, wherein the second data information is the voltage or current of the entire battery management system 300.

[0153] By connecting the execution detectors in series in the multiple groups of battery samplers 320, the second data information is obtained, and the first controller 311 controls the opening and closing of the relay in the execution detector to effectively protect the battery.

[0154] According to some embodiments of the present application, the second controller 312 is further configured to report the state information to a management regulator, and the management regulator is configured to control the closing of the switch of the execution detector according to the state information.

[0155] The second controller 312 and the management regulator can be connected through an Ethernet interface, a CAN interface or an SPI interface, which is not limited in the present application.

[0156] The management regulator can comprise an energy management system (EMS) and a power conversion system (PCS), and the second controller 312 reports the state information of the battery to the management regulator after calculation, and the management regulator can control the closing of the switch of the execution detector according to the state information. It should be understood that the first controller 311 and the management regulator can both control the closing of the switch of the execution detector. Controlling the switch of the execution detector through the management regulator can improve the control efficiency of the battery management system 300.

[0157] According to some embodiments of the present application, the second controller 312 comprises at least two Ethernet interfaces, and the Ethernet interfaces are configured to be connected with the management regulator.

[0158] The second controller 312 comprises at least two Ethernet interfaces, which are configured to be connected with other non-SPI interface management regulators to realize the multi-compatible function.

[0159] According to some embodiments of the present application, the first controller 311 further comprises at least one controller area network (CAN) interface and at least one Ethernet interface, and the CAN interface and the Ethernet interface are used to connect the plurality of battery samplers 320.

[0160] The first controller 311 comprises the CAN interface and the Ethernet interface in addition to the serial peripheral interface, and the battery samplers 320 compatible with the CAN interface and the Ethernet interface are used to realize the multi-compatible function.

[0161] According to some embodiments of the present application, the first controller 311 and the second controller 312 are connected through the serial peripheral interface.

[0162] The first controller 311 and the second controller 312 are connected through the SPI interface, and efficient data transmission can be realized.

[0163] In some embodiments, the second controller 312 further comprises some other interfaces used to realize other functions, for example, an interface connected with a secure digital card (SD card) is used to store the state information of the battery, and the burden of the second controller 312 can be reduced.

[0164] Figure 9 A schematic diagram of an energy storage device 900 provided by an embodiment of the present application is shown.

[0165] According to some embodiments of the present application, the present application further provides an energy storage device 900 comprising a plurality of batteries 901 and a battery management system 902, and the battery management system 902 is used to manage or control the plurality of batteries 901. Optionally, the battery management system 902 can be the battery management system 300 in any of the above-mentioned schemes.

[0166] According to some embodiments of the present application, the present application further provides an energy storage system comprising a power conversion device and the energy storage device in any of the above-mentioned schemes, and the power conversion device is used to electrically connect a power generation device and the energy storage device.

[0167] According to some embodiments of the present application, referring to Figure 4The application provides a battery management system 300, the battery management system 300 includes a first controller 311, a second controller 312 and a plurality of battery samplers 320, the first controller 311 and the second controller 312 are connected, at least one of the first controller 311 and the second controller 312 is connected with each battery sampler 320 in the plurality of battery samplers 320 and forms a loop, each battery sampler in each battery sampler 320 is connected in series in the loop, the first controller 311 is used for acquiring first data information of a battery corresponding to the plurality of battery samplers 320, the first data information includes one or more of the following information: voltage information, current information and temperature information, the first controller 311 is also used for managing the battery according to the first data information, the second controller 312 is used for determining state information of the battery according to the first data information. The first controller 311 and the second controller 312 in the battery management system 300 are managed and calculated respectively, so that the management control capability of the battery management system 300 is improved.

[0168] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the application, and not to limit them; although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the application, and they should be covered in the scope of the claims and the specification of the application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery management system, characterized by, The battery management system comprises a first controller, a second controller and a plurality of battery samplers, the first controller and the second controller are connected, at least one of the first controller and the second controller is connected with each of the plurality of battery samplers and forms a loop, and each of the plurality of battery samplers is connected in series in the loop, The first controller is configured to acquire first data information of a battery corresponding to the plurality of battery samplers, and the first data information comprises one or more of voltage information, current information and temperature information. The first controller is further configured to manage the battery according to the first data information. The second controller is configured to determine state information of the battery according to the first data information.

2. The battery management system of claim 1, wherein, The first controller is further configured to send the first data information to the second controller. The second controller is configured to determine the state information according to the first data information sent by the first controller.

3. The battery management system of claim 1, wherein, The battery management system further comprises a plurality of conversion chips, each of the plurality of battery samplers is connected with the controller through at least one of the plurality of conversion chips to form a loop, and the controller is connected with the plurality of conversion chips respectively, The plurality of conversion chips are configured to convert information between the first controller and / or the second controller and the battery samplers.

4. The battery management system of claim 3, wherein, The plurality of conversion chips comprise a first conversion chip and a second conversion chip, a first group of battery samplers in the plurality of battery samplers is connected with the first controller through the first conversion chip and the second conversion chip to form a loop, The plurality of conversion chips are configured to receive and convert the first data information sent by the battery samplers. The plurality of conversion chips are further configured to send the first data information to the first controller. The first controller is configured to manage the battery according to the first data information, and the management comprises at least one of temperature management, overvoltage or undervoltage management, insulation management or overcurrent management.

5. The battery management system of claim 4, wherein, The first controller comprises a plurality of serial peripheral interfaces, The first controller is connected with the plurality of conversion chips through the plurality of serial peripheral interfaces.

6. The battery management system of claim 3, wherein, The plurality of conversion chips comprise a first conversion chip and a second conversion chip, a first group of battery samplers in the plurality of battery samplers is connected with the second controller through the first conversion chip and the second conversion chip to form a loop, The plurality of conversion chips are configured to receive and convert the first data information sent by the battery samplers. The plurality of conversion chips are further configured to send the first data information to the second controller. The second controller is further configured to send the first data information to the first controller. The first controller is configured to manage the battery according to the first data information.

7. The battery management system of claim 6, wherein, The second controller comprises a logic unit and a processing unit, The plurality of conversion chips are configured to send the first data information to the logic unit. The logic unit is configured to send the first data information to the first controller. The first controller is configured to manage the battery according to the first data information.

8. The battery management system of claim 7, wherein, The first controller is further configured to send the first data information to the processing unit. The processing unit is configured to determine the state information of the battery according to the first data information.

9. The battery management system of claim 7, wherein, The logic unit is configured to send the first data information to the first controller through a high-speed serial interface.

10. The battery management system of claim 7, wherein, The logic unit comprises a plurality of serial peripheral interfaces, The plurality of conversion chips are configured to send the first data information to the logic unit through the plurality of serial peripheral interfaces.

11. The battery management system of any one of claims 4-10, wherein, The plurality of conversion chips comprise a third conversion chip, the third conversion chip comprises a first interface and a second interface, the first interface is connected with a first group of battery samplers in the plurality of groups of battery samplers, and the second interface is connected with a second group of battery samplers in the plurality of groups of battery samplers, The first controller or the second controller is configured to receive the first data information sent by the first group of battery samplers and the second group of battery samplers in parallel.

12. The battery management system of any one of claims 1-10, wherein, The battery management system further comprises an execution detector, the execution detector is connected in series in each group of battery samplers, The execution detector is configured to obtain second data information and send the second data information to the first controller, the second data information comprises voltage or current of the battery management system. The first controller is configured to control the switch of the execution detector to open according to the second data information.

13. The battery management system of claim 12, wherein, The second controller is further configured to report the state information to a management regulator, and the management regulator is configured to control the switch of the execution detector to close according to the state information.

14. The battery management system of claim 13, wherein, The second controller comprises at least two Ethernet interfaces, The Ethernet interface is configured to be connected with the management regulator.

15. The battery management system of any one of claims 1-10, wherein, The first controller further comprises at least one controller area network (CAN) interface and at least one Ethernet interface, The CAN interface and the Ethernet interface are configured to be connected with the plurality of groups of battery samplers.

16. The battery management system of claim 5, wherein, The first controller is connected with the second controller through the serial peripheral interface.

17. An energy storage device, characterized by The battery management system of any one of claims 1 to 16 is configured to manage or control a plurality of batteries.

18. An energy storage system characterized by, The power conversion device is configured to be electrically connected with a power generation device and the energy storage device.

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