Energy storage electric cabinet and energy storage system

Abstract

The invention provides an energy storage electric cabinet and an energy storage system. The energy storage electric cabinet comprises a positive bus and a negative bus; the at least two battery cell modules are connected in series; electric boxes are arranged in the battery cell module, and all the electric boxes are connected in series; electric cores are arranged in the electric boxes, and the electric cores in the electric boxes are connected in series and are connected between the positive bus and the negative bus; and the clamping unit is connected between the positive bus and the negative bus, the clamping unit comprises a plurality of clamping points, the box shells of the electric boxes in different battery cell modules are respectively connected with different clamping points, and different clamping points have different potentials.

Description

Technical Field

[0001] This application relates to the field of energy storage, and more particularly, to an energy storage cabinet and an energy storage system. Background Art

[0002] In a multi-electrical-box electrochemical energy storage system, multiple electrical boxes are arranged in a cabinet, and the multiple electrical boxes in the cabinet are connected in series to form a high-voltage loop. The more electrical boxes connected in series in the cabinet, the higher the cabinet-level voltage. Currently, all the electrical box casings in a cabinet are connected to the cabinet housing to clamp them to an equipotential. However, if the blue films of two battery cells in different electrical boxes are damaged, the aluminum casings of these two battery cells are electrically connected through the electrical box casings, resulting in a short circuit. If the electrical boxes corresponding to these two battery cells are at a relatively long distance apart, and there are many electrical boxes connected in series between the two battery cells, the electrolyte of these two battery cells will bear a relatively high voltage (such as 200V or a higher voltage), posing a risk of electrolyte smoking and catching fire, and reducing the safety performance of the energy storage cabinet. Summary of the Invention

[0003] The purpose of the embodiments of this application is to provide an energy storage cabinet and an energy storage system to improve the safety of the energy storage cabinet.

[0004] In a first aspect, this application provides an energy storage cabinet, including: a positive busbar and a negative busbar; at least two battery cell modules, each of the battery cell modules being connected in series; an electrical box is arranged in each of the battery cell modules, and each of the electrical boxes is connected in series; a battery cell is arranged in each of the electrical boxes, and the battery cells in each electrical box are connected in series and are connected between the positive busbar and the negative busbar; a clamping unit, the clamping unit is connected between the positive busbar and the negative busbar, the clamping unit includes a plurality of clamping points, and the casings of the electrical boxes in different battery cell modules are respectively connected to different clamping points, and the potentials of different clamping points are different.

[0005] In the embodiments of this application, a clamping unit is arranged between the positive busbar and the negative busbar in the energy storage cabinet. The clamping unit divides the voltage between the positive busbar and the negative busbar to form a plurality of clamping points, and the potential of each clamping point is different. The casings of the electrical boxes in each battery cell module are respectively connected to different clamping points, and the potentials between the electrical boxes in different battery cell modules are different. Even if the insulation of the battery cells in the electrical boxes in different battery cell modules fails, these two battery cells and the clamping unit form a loop, and the two battery cells will not short-circuit, thereby improving the safety of the energy storage cabinet.

[0006] In an optional embodiment, one electrical box is arranged in each of the battery cell modules, and the casings of the electrical boxes in each of the battery cell modules are connected to different clamping points.

[0007] In the embodiments of the present application, an electrical box is provided in each battery cell module, and the box shells of the respective electrical boxes are connected to different clamping points, so that the potentials between each pair of electrical boxes are different. When the blue film of the battery cells in different electrical boxes is damaged or other insulation failure problems occur, short circuits will not occur between the battery cells with insulation failure, but a loop will be formed with the clamping unit, thereby improving the safety of the energy storage cabinet.

[0008] In an alternative embodiment, the clamping unit includes a plurality of voltage divider components connected in series between the positive busbar and the negative busbar, and there is a clamping point between two of the voltage divider components.

[0009] In the embodiments of the present application, a voltage divider component is used as the clamping unit, and the voltage divider components are connected in series between the positive busbar and the negative busbar. Each voltage divider component forms a plurality of clamping points with different potentials through series voltage division. In this way, without too many improvements to the original energy storage cabinet, a plurality of clamping points with different potentials can be generated, which has the advantages of simple implementation method and low implementation cost.

[0010] In an alternative embodiment, the voltage divider component is a resistor.

[0011] In the embodiments of the present application, the voltage dividing component is set as a resistor. The resistor occupies a small volume in the circuit, and a plurality of clamping points with different potentials can be realized without additional setting of other circuit elements, which has the advantages of simple structure, low cost and strong reliability.

[0012] In an alternative embodiment, the resistance values of each resistor are the same, and the box shells of the electrical boxes in adjacent battery cell modules are sequentially connected to adjacent clamping points.

[0013] In the embodiments of the present application, the resistance values of each resistor are the same, so that the potential difference between adjacent clamping points formed after voltage division is the same. The box shells of the respective electrical boxes on the positive busbar are sequentially connected to adjacent clamping points, so that the potential difference between the box shells of two adjacent electrical boxes is the same, which is convenient for subsequent insulation design of each electrical box.

[0014] In an alternative embodiment, the clamping unit further includes a capacitor, and the capacitor is arranged between the positive busbar and the negative busbar.

[0015] In the embodiments of the present application, a capacitor is arranged between the positive busbar and the negative busbar, which can reduce the occurrence of surges in the energy storage cabinet, thereby causing potential fluctuations at the clamping point potentials and improving the stability of the potentials of each clamping point.

[0016] In an alternative embodiment, a capacitor is arranged in parallel with one of the voltage divider components.

[0017] In the embodiments of the present application, each voltage divider device is arranged in parallel with a capacitor, which can more effectively reduce the potential floating at the clamping point caused by surges and improve the stability of the potential at each clamping point.

[0018] In an alternative embodiment, the energy storage cabinet further includes a fuse, and the fuse is arranged on the positive bus and / or the negative bus.

[0019] In the embodiments of the present application, a fuse is arranged on the positive bus and / or the negative bus. When the current on the positive bus or the negative bus is too large, the fuse melts, avoiding the burning of the battery cells in the electrical box connected in series on the positive bus and improving the safety of the energy storage cabinet.

[0020] In an alternative embodiment, the energy storage cabinet further includes a main control box, which is used to control whether the energy storage cabinet is connected to the energy storage system, and the main control box is equipotentially connected to the cabinet shell of the energy storage cabinet.

[0021] In an alternative embodiment, the clamping unit is arranged in the main control box.

[0022] In a second aspect, the present application provides an energy storage system, including: at least two energy storage cabinets as described in any of the foregoing embodiments, the positive buses in each of the energy storage cabinets are connected to each other, and the negative buses in each of the energy storage cabinets are connected to each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and those of ordinary skill in the art can also obtain other drawings based on these drawings.

[0024] Figure 1 It is a schematic structural diagram of an energy storage cabinet provided by an embodiment of the present application;

[0025] Figure 2 It is a schematic structural diagram of another energy storage cabinet provided by an embodiment of the present application;

[0026] Figure 3 It is a schematic structural diagram of another energy storage cabinet provided by an embodiment of the present application;

[0027] Figure 4 It is a schematic structural diagram of another energy storage cabinet provided by an embodiment of the present application;

[0028] Figure 5 It is a schematic structural diagram of another energy storage cabinet provided by an embodiment of the present application;

[0029] Figure 6Another structural schematic diagram of the energy storage cabinet provided by the embodiment of the present application;

[0030] Figure 7 Another structural schematic diagram of the energy storage cabinet provided by the embodiment of the present application;

[0031] Figure 8 A structural schematic diagram of an energy storage system provided by the embodiment of the present application;

[0032] Figure 9 Another structural schematic diagram of the energy storage system provided by the embodiment of the present application.

[0033] Icons: 100 - energy storage cabinet; 101 - positive busbar; 102 - negative busbar; 103 - electrical box; 104 - clamping unit; 105 - cabinet housing; 106 - main control box; 700 - energy storage system. Detailed implementation manners

[0034] Next, the technical solutions in the embodiments of the present application will be described with reference to the accompanying drawings in the embodiments of the present application.

[0035] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. Moreover, the term "including", "comprising" or any other variation thereof is intended to cover a non - exclusive inclusion, such that a process, method, article or device including a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

[0036] Furthermore, the term "and / or" in the present application is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The term "plural" means two or more (including two).

[0037] The quality and safety of traditional electrochemical energy storage are the most concerned indicators in the industry development. There are cases of fire and explosion accidents in individual energy storage power stations at home and abroad. The battery pack is a component containing high - energy substances and has great danger. Moreover, with the explosion of the electrochemical energy storage market, the impact of accidents is gradually increasing.

[0038] A high-voltage loop is formed by connecting multiple electrical boxes in series in an electrical cabinet. After the blue films of two battery cells are damaged, the aluminum casings of the two battery cells are electrically connected through the housing of the electrical box, so the electrolyte may bear a voltage of more than 200V, posing a risk of electrolyte smoking and catching fire, and reducing the safety performance of the electrochemical energy storage product.

[0039] In the embodiment of the present application, a clamping unit is arranged between the positive bus bar and the negative bus bar in the energy storage cabinet. The clamping unit divides the voltage between the positive bus bar and the negative bus bar to form multiple clamping points, and the potentials of each clamping point are different. The casings of the electrical boxes in each battery cell module are respectively connected to different clamping points, and the potentials between the electrical boxes in different battery cell modules are different. Even if the insulation of the battery cells in the electrical boxes in different battery cell modules fails, these two battery cells form a loop with the clamping unit, and the two battery cells will not be short-circuited, thereby improving the safety of the energy storage cabinet.

[0040] The energy storage cabinet provided in the embodiment of the present application can be arranged in an energy storage system. The energy storage system includes but is not limited to: energy storage power supply systems in scenarios such as hydropower, thermal power, wind power, and solar power stations; energy storage systems for electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles; and energy storage systems in multiple fields such as military equipment and aerospace.

[0041] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of an energy storage cabinet provided in the embodiment of the present application. The energy storage cabinet 100 may include: a positive bus bar 101, a negative bus bar 102, at least two battery cell modules 103 of electrical boxes, and a clamping unit 104.

[0042] At least 2 battery cell modules 103 are arranged in the energy storage cabinet 100, and each battery cell module 103 is connected in series. Electrical boxes are arranged in the battery cell module 103, and each electrical box is connected in series. Battery cells are arranged in the electrical box, and the battery cells in each electrical box are connected in series and are connected between the positive bus bar 101 and the negative bus bar 102. In the embodiment of the present application, the number of battery cells in the electrical box is not limited. One or more battery cells can be arranged in one electrical box. The more the number of battery cells, the greater the energy storage capacity of the energy storage cabinet.

[0043] The clamping unit 104 is arranged between the positive bus bar 101 and the negative bus bar 102. One end of the clamping unit 104 is electrically connected to the positive bus bar 101, and the other end is electrically connected to the negative bus bar 102. The clamping unit 104 includes multiple clamping points, and the casings of the electrical boxes in different battery cell modules 103 are respectively connected to different clamping points, and the potentials of different clamping points are different.

[0044] In the embodiments of the present application, the battery cell module 103 is composed of electrical boxes. The battery cell module 103 is a division of the electrical boxes in the energy storage cabinet, and all the electrical boxes connected to the same clamping point form a battery cell module 103. For example, there are 3 electrical boxes, namely electrical box A, electrical box B, and electrical box C, in the energy storage cabinet. The casings of electrical box A and electrical box B are connected to the same clamping point, and electrical box A and electrical box B form a battery cell module 103. The casing of electrical box C is connected to another clamping point, and electrical box C is a battery cell module 103.

[0045] In some embodiments, at least two electrical boxes are provided in one battery cell module 103, and the casing of each electrical box in one battery cell module 103 is connected to the same clamping point.

[0046] In the embodiments of the present application, when the number of battery cells connected in series in each electrical box is small, a large number of electrical boxes are provided in an energy storage cabinet. If each electrical box is connected to a different clamping point, a large number of clamping units need to be provided, resulting in an increase in the volume of the energy storage cabinet. When the number of battery cells connected in series in each electrical box is small, the voltage difference between adjacent electrical boxes is low. Therefore, several adjacent electrical boxes can be formed into a battery cell module 103. The casing of each electrical box in one battery cell module 103 is connected to the same clamping point, and the casings of the electrical boxes in different battery cell modules 103 are connected to different clamping points. By the above method, the number of clamping units provided can be reduced, thereby reducing the volume of the energy storage cabinet. By the above method, the number of clamping units provided can be reduced, thereby reducing the volume of the energy storage cabinet.

[0047] For example, as Figure 2 shown, there are 2 battery cell modules 103 in an energy storage cabinet 100. There are 2 electrical boxes in one battery cell module 103, and the casings of these two electrical boxes are connected to the same clamping point of the clamping unit 104. There is 1 electrical box in another battery cell module 103, and the casing of this electrical box is connected to another clamping point of the clamping unit 104.

[0048] In other embodiments, one electrical box is provided in one battery cell module 103, and the casings of the electrical boxes in each battery cell module are connected to different clamping points.

[0049] In the embodiments of the present application, when the number of battery cells connected in series in each electrical box is large, the voltage difference between adjacent electrical boxes is high. In order to reduce the short circuit between two battery cells in different electrical boxes due to insulation failure, the casings of different electrical boxes are connected to different clamping points.

[0050] Further, the energy storage cabinet 100 may include: an electric cabinet housing 105. The battery cell module 103 and the clamping unit 104 are disposed in the electric cabinet housing 105. In a high-voltage direct-connected energy storage system, the electric cabinet housing 105 may be connected to a clamping point that is not connected to any electric box, such that the potential of the electric cabinet housing 105 is different from the potential of other electric boxes. In a low-voltage direct-connected energy storage system, the electric cabinet housing 105 is grounded.

[0051] Taking an example that one electric box is provided in one battery cell module 103, the clamping unit 104 provided by the embodiment of the present application will be introduced below.

[0052] As an optional implementation manner, the clamping unit 104 includes a plurality of voltage divider components connected in series between the positive bus 101 and the negative bus 102, and there is a clamping point between two voltage divider components.

[0053] In the embodiment of the present application, a plurality of voltage divider components are provided between the positive bus 101 and the negative bus 102, and the plurality of voltage divider components are connected in series to divide the voltage between the positive bus 101 and the negative bus 102, and a clamping point is formed between two voltage divider components. According to the circuit principle, the potential of each clamping point formed between every two voltage divider components is different under the action of the voltage divider components. The housing of the electric box and the electric cabinet housing 105 are respectively connected to different clamping points. The housing of the electric box and the electric cabinet housing 105 may be connected to the corresponding clamping points through wires.

[0054] During the operation of the energy storage cabinet, the battery cells in each electric box are connected in series, and each voltage divider component between the positive bus 101 and the negative bus 102 can be equivalent to a load. If the insulation of the battery cells in two electric boxes fails, then these two electric boxes form a loop with at least one voltage divider component. Since the voltage divider component is equivalent to a load, at least one voltage divider component is connected in series between the two battery cells with insulation failure. Under the action of the voltage divider component, the voltage between the two battery cells will act on the voltage divider component, so that the electrolyte in the two battery cells with insulation failure will not bear a high voltage, reducing the risk of electrolyte smoking and fire, and improving the safety performance of the energy storage cabinet.

[0055] As an optional implementation manner, the voltage divider component may be a resistor. The resistance value of the resistor may be in the order of kilo-ohm or mega-ohm. For example, the resistor may be 10 kΩ, 20 kΩ, 1 MΩ, etc.

[0056] Such as Figure 3As shown in the figure, 4 resistors are connected in series between the positive busbar 101 and the negative busbar 102. The clamping point 1 is between resistor 1 and resistor 2, the clamping point 2 is between resistor 2 and resistor 3, and the clamping point 3 is between resistor 3 and resistor 4. There are 2 electrical boxes arranged in the energy storage cabinet 100. The housing of electrical box 1 is connected to the clamping point 1, the cabinet housing 105 is connected to the clamping point 2, and the electrical box 2 is connected to the clamping point 3.

[0057] If an insulation failure occurs in one battery cell in electrical box 1 and one battery cell in electrical box 2 respectively, the electrolyte in the battery cells is in direct contact with the metal housing of the electrical box. There are resistor 2 and resistor 3 arranged between electrical box 1 and electrical box 2. The two insulation-failed battery cells are connected in series with resistor 2 and resistor 3 to form a loop. In this loop, the voltage between the two insulation-failed battery cells will act on resistor 2 and resistor 3. Both resistor 2 and resistor 3 are resistors in the order of kiloohms or megaohms, and the two insulation-failed battery cells will not be short-circuited, so that the electrolyte in the two insulation-failed battery cells will not have the risk of smoking or catching fire, improving the safety performance of the energy storage cabinet.

[0058] This application does not limit the connection method of the housing of the electrical box and the cabinet housing to each clamping point. The housing of the electrical box and the cabinet housing can be connected to any clamping point, as long as the clamping points to which the housing of each electrical box and the cabinet housing are connected are different.

[0059] The voltage-dividing component is set as a resistor. The resistor occupies a small volume in the circuit, and multiple clamping points with different potentials can be realized without additionally setting other circuit elements, which has the advantages of simple structure, low cost and strong reliability.

[0060] In addition, in other embodiments, the voltage-dividing device can also be other components that can perform voltage division between the positive busbar 101 and the negative busbar 102, such as zener diodes, triodes, etc. This application does not make specific limitations on this.

[0061] Furthermore, as an optional embodiment, when the voltage-dividing device is a resistor, the resistance values of all resistors are the same, and the housing of adjacent electrical boxes are sequentially connected to adjacent clamping points.

[0062] In the embodiment of this application, when a resistor is set between the positive busbar 101 and the negative busbar 102 as the voltage-dividing device, the resistance values of all resistors are the same, so that the potential difference between adjacent clamping points is the same. The housing of each electrical box on the positive busbar is sequentially connected to adjacent clamping points, so that the potential difference between the housing of adjacent two electrical boxes is the same.

[0063] For example, the potential of the positive busbar 101 is 200V, and the potential of the negative busbar 102 is 0V. Three resistors, namely Resistor 1, Resistor 2, Resistor 3, and Resistor 4, are arranged between the positive busbar 101 and the negative busbar 102. The potential of the clamping point 1 between Resistor 1 and Resistor 2 is 150V, the potential of the clamping point 2 between Resistor 2 and Resistor 3 is 100V, and the potential of the clamping point 3 between Resistor 3 and Resistor 4 is 50V.

[0064] In the above manner, the potential difference between adjacent clamping points is the same. The casings of each electrical box on the positive busbar are sequentially connected to adjacent clamping points, so that the potential difference between the casings of two adjacent electrical boxes is the same, facilitating subsequent insulation design for each electrical box.

[0065] Further, as an optional implementation manner, the clamping unit 104 further includes a capacitor. The capacitor is arranged between the positive busbar 101 and the negative busbar 102, and the number of capacitors is not limited and can be one or more.

[0066] In some embodiments, as Figure 4 shown, one capacitor is arranged between the positive busbar 101 and the negative busbar 102. One end of the capacitor is electrically connected to the positive busbar 101, and the other end is electrically connected to the negative busbar 102. By arranging this capacitor, the occurrence of surges in the energy storage cabinet can be reduced, thereby preventing potential fluctuations at the clamping points and improving the stability of the potential of each clamping point.

[0067] In some other embodiments, the capacitors correspond one-to-one to the voltage dividing components, and one capacitor is arranged in parallel with one voltage dividing component.

[0068] As Figure 5 shown, the voltage dividing component is a resistor, and a capacitor is arranged in parallel at both ends of each resistor. Arranging a capacitor in parallel at both ends of the resistor can reduce the potential floating at the clamping points caused by surges and improve the stability of the potential of each clamping point.

[0069] Further, as an optional implementation manner, the energy storage cabinet 100 includes a fuse. The fuse can be arranged on the positive busbar 101, the negative busbar, and / or the negative busbar 102. When the current on the positive busbar 101 or the negative busbar 102 in the energy storage cabinet 100 is too large, the fuse melts, preventing the battery cells in the electrical boxes connected in series on the positive busbar 101 from burning out and improving the safety of the energy storage cabinet 100.

[0070] Further, as an optional implementation manner, the energy storage cabinet 100 further includes a main control box 106. The main control box 106 is used to control whether the energy storage cabinet 100 is connected to the energy storage system.

[0071] In the embodiments of the present application, multiple energy storage cabinets 100 are usually arranged in an energy storage system. A main control box 106 is arranged in each energy storage cabinet 100. According to the working requirements of the energy storage system, the main control box 106 controls whether its corresponding energy storage cabinet is connected to the energy storage system.

[0072] A switch is arranged in the main control box 106, and the switch can be arranged on the positive busbar 101 and / or the negative busbar 103. When the switch is in the closed state, the energy storage cabinet 100 is connected to the energy storage system. When the switch is in the open state, the energy storage cabinet 100 is not connected to the energy storage system.

[0073] In addition, if a certain energy storage cabinet 100 fails, the switch in the main control box of the energy storage cabinet 100 is disconnected, so as to bypass the energy storage cabinet 100 from the energy storage system and prevent the faulty energy storage cabinet from affecting the normal operation of other energy storage cabinets in the energy storage system.

[0074] In some embodiments, as Figure 6 shown, the main control box 106 is arranged outside the cabinet shell of the energy storage cabinet, and the cabinet shell of the main control box 106 is connected to the cabinet shell 105 of the energy storage cabinet at the same potential.

[0075] In other embodiments, as Figure 7 shown, the main control box 106 is arranged in the cabinet shell of the energy storage cabinet, and the cabinet shell of the main control box 106 is connected to the cabinet shell 105 of the energy storage cabinet at the same potential.

[0076] There are various ways of connecting at the same potential. For example: connecting through wires, connecting through bolt locking, etc. The present application does not make specific limitations on this.

[0077] Furthermore, the embodiments of the present application do not limit the installation position of the clamping unit 104.

[0078] In some embodiments, the clamping unit 104 is arranged between the positive busbar 101 and the negative busbar 102 in the cabinet shell 105.

[0079] In other embodiments, the clamping unit 104 is arranged between the positive busbar 101 and the negative busbar 102 in the main control box 106.

[0080] The present application also provides an energy storage system. Please refer to Figure 8 , Figure 8 which is a schematic structural diagram of an energy storage system provided by the embodiments of the present application. The energy storage system 700 may include: multiple energy storage cabinets 100, the positive busbars in each energy storage cabinet are connected to each other, and the negative busbars in each energy storage cabinet are connected to each other.

[0081] The energy storage system 700 provided by the embodiments of the present application can be applied to high-voltage direct-connected energy storage scenarios or low-voltage direct-connected energy storage scenarios. When the energy storage system 700 is applied to a high-voltage direct-connected energy storage scenario, as Figure 8 shown, the positive busbars in multiple energy storage cabinets 100 are connected to each other, and the negative busbars in multiple energy storage cabinets 100 are connected to each other. When the grid power is in excess, the grid charges the battery cells in the electrical box, converting the grid power into the electrical energy in the battery cells; when the grid power is low, the battery cells in the electrical box discharge to compensate for the grid power.

[0082] When the energy storage system 700 is applied to a low-voltage direct-connected energy storage scenario, as Figure 9 shown, the connection relationship of multiple energy storage cabinets 100 is the same. The difference is that in the low-voltage direct-connected energy storage scenario, the cabinet shell and the main control box are connected with equal potential and grounded.

[0083] The energy storage cabinet in the embodiments of the present application can be the energy storage cabinet in the foregoing various embodiments. The working principle of the energy storage cabinet can be referred to the foregoing introduction to the energy storage cabinet. For the sake of simplicity of the specification, it will not be repeated here.

[0084] In the embodiments provided by the present application, it should be understood that the disclosed device can be implemented in other ways. The device embodiments described above are only illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For another example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point, the displayed or discussed coupling or direct coupling or communication connection between each other can be through some communication interfaces. The indirect coupling or communication connection of the device or unit can be electrical, mechanical or other forms.

[0085] In addition, the units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place, or they can be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0086] Furthermore, in each embodiment of the present application, the various functional modules can be integrated together to form an independent part, or each module can exist alone, or two or more modules can be integrated to form an independent part.

[0087] The above are only embodiments of the present application and are not intended to limit the protection scope of the present application. For those skilled in the art, various modifications and changes can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. An energy storage electric cabinet, characterized in that, it includes: a positive bus bar and a negative bus bar; at least two battery cell modules, each of the battery cell modules being connected in series; an electrical box is provided in each of the battery cell modules, and the electrical boxes are connected in series; battery cells are provided in the electrical boxes, and the battery cells in each electrical box are connected in series and are connected between the positive bus bar and the negative bus bar; a clamping unit, the clamping unit is connected between the positive bus bar and the negative bus bar, the clamping unit includes a plurality of clamping points, the casings of the electrical boxes in different battery cell modules are respectively connected to different clamping points, and the potentials of different clamping points are different.

2. The energy storage electric cabinet according to claim 1, characterized in that, one electrical box is provided in each of the battery cell modules, and the casings of the electrical boxes in each of the battery cell modules are connected to different clamping points.

3. The energy storage electric cabinet according to claim 1, characterized in that, the clamping unit includes a plurality of voltage divider components connected in series between the positive bus bar and the negative bus bar, and there is a clamping point between two of the voltage divider components.

4. The energy storage electric cabinet according to claim 3, characterized in that, the voltage divider component is a resistor.

5. The energy storage electric cabinet according to claim 4, characterized in that, the resistance values of each resistor are the same, and the casings of the electrical boxes in adjacent battery cell modules are sequentially connected to adjacent clamping points.

6. The energy storage electric cabinet according to any one of claims 2-5, characterized in that, the clamping unit further includes a capacitor, and the capacitor is provided between the positive bus bar and the negative bus bar.

7. The energy storage electric cabinet according to claim 6, characterized in that, one of the voltage divider components is provided with one of the capacitors in parallel.

8. The energy storage electric cabinet according to claim 1, characterized in that, the energy storage electric cabinet further includes a fuse, and the fuse is provided on the positive bus bar and / or the negative bus bar.

9. The energy storage electric cabinet according to claim 1, characterized in that, the energy storage electric cabinet further includes a main control box, the main control box is used to control whether the energy storage electric cabinet is connected to the energy storage system, and the main control box is connected to the electric cabinet housing of the energy storage electric cabinet at the same potential.

10. The energy storage electric cabinet according to claim 9, characterized in that, the clamping unit is provided in the main control box.

11. An energy storage system, characterized in that, it includes: at least two energy storage electric cabinets according to any one of claims 1-10, the positive bus bars in each of the energy storage electric cabinets are connected to each other, and the negative bus bars in each of the energy storage electric cabinets are connected to each other.

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