Electrochemical energy storage system

Abstract

The utility model discloses an electrochemical energy storage system, including energy storage cabinet cabinet body, control box, first energy storage converter, second energy storage converter, distribution box and a plurality of battery packs, and the energy storage cabinet cabinet body is provided with the first chamber and the second chamber that are mutually isolated in the inside, a plurality of battery packs are stacked and are formed first battery cluster and second battery cluster in the first chamber, control box is located in the second chamber, and control box is connected with first battery cluster electricity through first direct current line group, and is connected with second battery cluster electricity through second direct current line group, first energy storage converter, second energy storage converter and distribution box are located in the second chamber, and the direct current side of first energy storage converter, the direct current side of second energy storage converter are connected with control box electricity, and distribution box is connected with first energy storage converter and second energy storage converter electricity respectively. Can realize the substantial promotion of energy storage capacity under the condition of the same land area, effectively promote energy density, be favorable to the capacity demand and satisfy the volume requirement.

Description

Technical Field

[0001] This utility model relates to the field of energy storage systems, and in particular to an electrochemical energy storage system. Background Technology

[0002] In the new energy technology architecture, electrochemical energy storage cabinets, as a key carrier for power energy management, employ electrochemical energy storage systems, such as lithium iron phosphate, ternary lithium battery cells, or lithium titanate fast-charging topologies, and have been deeply integrated into modern industrial and commercial energy networks. The technical characteristics of electrochemical energy storage cabinets are generally manifested in: through intelligent charging and discharging control modules, they achieve dynamic frequency and voltage regulation of the power grid, demand response, and power quality management, constructing a multi-dimensional energy management matrix covering load shaping, peak shaving and valley filling, and emergency backup power.

[0003] Currently, electrochemical energy storage systems applied in industrial and commercial scenarios are often constrained by space conditions, making it impossible to simultaneously meet capacity and volume requirements. Utility Model Content

[0004] The purpose of this invention is to solve at least one of the technical problems existing in the prior art and to provide an electrochemical energy storage system that can effectively improve energy density and is conducive to balancing capacity requirements and volume requirements.

[0005] This utility model provides an electrochemical energy storage system, including an energy storage cabinet, a control box, a first energy storage converter, a second energy storage converter, a power distribution box, and multiple battery packs, wherein: The energy storage cabinet has a first chamber and a second chamber that are isolated from each other. The first chamber corresponds to the upper middle area of ​​the energy storage cabinet, and the second chamber corresponds to the lower area of ​​the energy storage cabinet. The multiple battery packs are stacked in the first chamber to form a first battery cluster and a second battery cluster. Both the first battery cluster and the second battery cluster include a plurality of battery packs stacked sequentially from top to bottom. The control box is disposed in the second chamber. The control box is electrically connected to the first battery cluster via a first DC line group and electrically connected to the second battery cluster via a second DC line group. The first energy storage converter is disposed in the second chamber, and the DC side of the first energy storage converter is electrically connected to the control box; The second energy storage converter is disposed in the second chamber, and the DC side of the second energy storage converter is electrically connected to the control box; The power distribution box is located in the second chamber and is electrically connected to the first energy storage converter and the second energy storage converter, respectively.

[0006] The electrochemical energy storage system provided by this utility model embodiment has at least the following beneficial effects: by setting two mutually isolated chambers, a first chamber and a second chamber, inside the energy storage cabinet, stacking multiple battery packs in the first chamber, and placing the control box, the first energy storage converter, the second energy storage converter, and the power distribution box in the second chamber, that is, the first chamber serves as the battery compartment and the second chamber serves as the electrical compartment, a partitioned three-dimensional layout of the power conversion device and the battery cluster is realized. Combined with the stacking layout of multiple battery packs in the first chamber, the energy storage capacity can be significantly increased under the same floor space, effectively improving the energy density, which is conducive to balancing capacity requirements and meeting volume requirements.

[0007] According to some embodiments of the present invention, the electrochemical energy storage system is provided, wherein the control box is used to control whether the electrical connection between the first battery cluster and the DC side of the first energy storage converter is connected, and to control whether the electrical connection between the second battery cluster and the DC side of the second energy storage converter is connected.

[0008] According to some embodiments of the present invention, the electrochemical energy storage system provided in the power distribution box is provided with a busbar, the AC side of the first energy storage converter is electrically connected to the busbar through a first AC line group, and the AC side of the second energy storage converter is electrically connected to the busbar through a second AC line group.

[0009] According to some embodiments of the present invention, the electrochemical energy storage system is provided with a protection device inside the distribution box, and the busbar is located on the incoming side of the protection device.

[0010] According to some embodiments of the present invention, the electrochemical energy storage system includes a battery monitoring module inside the control box, and the battery monitoring module and the plurality of battery packs are connected in series via shielded communication cables.

[0011] According to some embodiments of the present invention, the electrochemical energy storage system is provided in which the control box is communicatively connected to the first energy storage converter and the second energy storage converter via communication lines.

[0012] According to some embodiments of the present invention, the electrochemical energy storage system is provided in which the first battery cluster is located on the left side of the first chamber, and the second battery cluster is located on the right side of the first chamber; the control box, the first energy storage converter, and the second energy storage converter are located on the left side of the second chamber; and the power distribution box is located on the right side of the second chamber.

[0013] According to some embodiments of the present invention, in the electrochemical energy storage system, the first energy storage converter is located above the second energy storage converter, and the control box is located to the left of the first energy storage converter and the second energy storage converter.

[0014] The electrochemical energy storage system provided according to some embodiments of the present invention further includes a liquid cooling unit disposed on the right side of the second chamber and located above the power distribution box.

[0015] The electrochemical energy storage system provided according to some embodiments of the present invention further includes a fire-fighting device disposed in the first chamber and located above the first battery cluster and the second battery cluster.

[0016] The electrochemical energy storage system provided according to some embodiments of the present invention further includes a left cabinet door and a right cabinet door disposed on the energy storage cabinet body, wherein an indicator light and an emergency stop switch are disposed on the left cabinet door.

[0017] According to some embodiments of the present invention, the electrochemical energy storage system is provided with a cooling fan on the right cabinet door, and the left and right cabinet doors are also provided with air inlets and dust filters located at the air inlets.

[0018] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0019] The accompanying drawings are provided to further understand the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this utility model to explain the technical solution of this utility model, and do not constitute a limitation on the technical solution of this utility model.

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a schematic diagram of the layout of the electrochemical energy storage system provided in this embodiment of the utility model; Figure 2 This is a schematic diagram of the communication circuit of the electrochemical energy storage system provided in this embodiment of the utility model; Figure 3 This is a schematic diagram of the DC power circuit of the electrochemical energy storage system provided in this embodiment of the present invention; Figure 4 This is a schematic diagram of the AC power circuit of the electrochemical energy storage system provided in this embodiment of the present invention; Detailed Implementation This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0021] In the description of the embodiments of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc. are understood to exclude the stated number, while "above," "below," "within," etc. are understood to include the stated number. "At least one" refers to one or more, and "at least one of the following" and similar expressions refer to any combination of these items, including any combination of single or multiple items. If "first," "second," etc., are used in the description, they are only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of the indicated technical features.

[0022] It should be noted that the terms "setting," "installing," and "connecting" in the embodiments of this utility model should be interpreted broadly. Those skilled in the art can reasonably determine the specific meaning of the above terms in the embodiments of this utility model in conjunction with the specific content of the technical solution. For example, the term "connection" can be a mechanical connection, an electrical connection, or a connection that allows for mutual communication; it can be a direct connection or an indirect connection through an intermediate medium.

[0023] It should be noted that the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0024] In the new energy technology architecture, electrochemical energy storage cabinets, as a key carrier for power energy management, employ electrochemical energy storage systems, such as lithium iron phosphate, ternary lithium battery cells, or lithium titanate fast-charging topologies, and have been deeply integrated into modern industrial and commercial energy networks. The technical characteristics of electrochemical energy storage cabinets are generally manifested in: through intelligent charging and discharging control modules, they achieve dynamic frequency and voltage regulation of the power grid, demand response, and power quality management, constructing a multi-dimensional energy management matrix covering load shaping, peak shaving and valley filling, and emergency backup power. Currently, electrochemical energy storage systems applied in industrial and commercial scenarios are often constrained by space conditions, making it impossible to simultaneously meet capacity and volume requirements.

[0025] Based on this, the present invention provides an electrochemical energy storage system that effectively improves energy density and is beneficial for balancing capacity requirements and volume requirements.

[0026] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0027] Figure 1This is a schematic diagram of the layout of the electrochemical energy storage system provided in this embodiment of the utility model; Figure 2 This is a schematic diagram of the communication circuit of the electrochemical energy storage system provided in this embodiment of the utility model; Figure 3 This is a schematic diagram of the DC power circuit of the electrochemical energy storage system provided in this embodiment of the present invention; Figure 4 This is a schematic diagram of the AC power circuit of the electrochemical energy storage system provided in this embodiment of the present invention. (Refer to...) Figures 1 to 4 The first aspect of this utility model provides an electrochemical energy storage system, including an energy storage cabinet 1, a control box 6, a first energy storage converter 7, a second energy storage converter 8, a power distribution box 9, and multiple battery packs, wherein: The energy storage cabinet 1 has a first chamber and a second chamber that are isolated from each other. The first chamber corresponds to the upper middle area of ​​the energy storage cabinet 1, and the second chamber corresponds to the lower area of ​​the energy storage cabinet 1.

[0028] Multiple battery packs are stacked in a first chamber to form a first battery cluster and a second battery cluster. Both the first and second battery clusters include several battery packs stacked sequentially from top to bottom; for example, such as... Figure 1 As shown, the first chamber contains a total of 10 battery packs. The first battery cluster is located on the left side of the first chamber and consists of 5 battery packs stacked from top to bottom. Figure 1 Battery pack 11 is the topmost battery pack in the first battery cluster; the second battery cluster is located on the right side of the first chamber, and also includes five battery packs stacked from top to bottom. Figure 1 Battery pack 12 is the topmost battery pack in the second battery cluster; combined with Figures 2 to 4 The first battery cluster comprises five battery packs, numbered from top to bottom as follows: Battery Pack PACK6, Battery Pack PACK7, Battery Pack PACK8, Battery Pack PACK9, and Battery Pack PACK10; the second battery cluster comprises five battery packs, numbered from top to bottom as follows: Battery Pack PACK1, Battery Pack PACK2, Battery Pack PACK3, Battery Pack PACK4, and Battery Pack PACK5.

[0029] Control box 6 is disposed in the second chamber. Control box 6 is electrically connected to the first battery cluster via a first DC line group and electrically connected to the second battery cluster via a second DC line group. For example, the DC wiring between control box 6 and the first and second battery clusters is as follows: Figure 3As shown, the control box 6 includes a first terminal block and a second terminal block. Specifically, for the first battery pack: the positive terminal BAT2+ in the first terminal block is electrically connected to the positive terminal BAT+ of battery pack PACK10 in the first battery pack via the positive terminal wire in the first DC line group; the negative terminal BAT- of battery pack PACK10 is electrically connected to the positive terminal BAT+ of battery pack PACK9 via a wire; the negative terminal BAT- of battery pack PACK9 is electrically connected to the positive terminal BAT+ of battery pack PACK8 via a wire; the negative terminal BAT- of battery pack PACK8 is electrically connected to the positive terminal BAT+ of battery pack PACK7 via a wire; the negative terminal BAT- of battery pack PACK7 is electrically connected to the positive terminal BAT+ of battery pack PACK6 via a wire; finally, the negative terminal BAT- of battery pack PACK6 is also electrically connected to the first terminal block via the negative terminal wire in the first DC line group. The negative terminal BAT2- in the terminal block; for the second battery cluster: the positive terminal BAT1+ in the second terminal block is electrically connected to the positive terminal BAT+ of battery pack PACK5 in the second battery cluster via the positive terminal of the second DC line group; the negative terminal BAT- of battery pack PACK5 is electrically connected to the positive terminal BAT+ of battery pack PACK4 via a wire; the negative terminal BAT- of battery pack PACK4 is electrically connected to the positive terminal BAT+ of battery pack PACK3 via a wire; the negative terminal BAT- of battery pack PACK3 is electrically connected to the positive terminal BAT+ of battery pack PACK2 via a wire; the negative terminal BAT- of battery pack PACK2 is electrically connected to the positive terminal BAT+ of battery pack PACK1 via a wire; finally, the negative terminal BAT- of battery pack PACK1 is also electrically connected to the negative terminal BAT1- in the second terminal block via the negative terminal of the second DC line group. It can be understood that the control box 6 is essentially designed to manage the first and second battery clusters independently.

[0030] The first energy storage converter 7 is disposed in the second chamber, and the DC side of the first energy storage converter 7 is electrically connected to the control box 6; exemplarily, Figure 1 The first energy storage converter 7 in the middle corresponds to Figures 2 to 4 The DC wiring between PCS #2, control box 6, and the first energy storage converter 7 is referenced. Figure 3 As shown, the control box 6 also includes a third terminal block. The positive terminal DC2+ in the third terminal block is electrically connected to the positive terminal BAT+ on the DC side of the first energy storage converter 7 via a wire, and the negative terminal DC2- in the third terminal block is electrically connected to the negative terminal BAT- on the DC side of the first energy storage converter 7 via a wire.

[0031] The second energy storage converter 8 is disposed in the second chamber, and the DC side of the second energy storage converter 8 is electrically connected to the control box 6; exemplarily, Figure 1 The second energy storage converter 8 in the middle corresponds to Figures 2 to 4 The DC wiring between PCS #1, control box 6, and the second energy storage converter 8 is referenced. Figure 3 As shown, the control box 6 also includes a fourth terminal block. The positive terminal DC1+ in the fourth terminal block is electrically connected to the positive terminal BAT+ on the DC side of the second energy storage converter 8 via a wire, and the negative terminal DC1- in the fourth terminal block is electrically connected to the negative terminal BAT- on the DC side of the second energy storage converter 8 via a wire.

[0032] Distribution box 9 is located in the second chamber and is electrically connected to the first energy storage converter 7 and the second energy storage converter 8, respectively. For example, the AC wiring between distribution box 9 and the first energy storage converter 7 and the second energy storage converter 8 is as follows: Figure 4 As shown.

[0033] The electrochemical energy storage system provided in this embodiment of the utility model sets up two mutually isolated chambers, a first chamber and a second chamber, inside the energy storage cabinet 1. Multiple battery packs are stacked in the first chamber, and the control box 6, the first energy storage converter 7, the second energy storage converter 8, and the power distribution box 9 are set in the second chamber. That is, the first chamber serves as the battery compartment and the second chamber serves as the electrical compartment. This achieves a partitioned three-dimensional layout of power conversion devices and battery clusters. With the stacking layout of multiple battery packs in the first chamber, the energy storage capacity can be significantly increased in the same area, effectively improving the energy density and helping to balance capacity requirements and meet volume requirements.

[0034] Reference Figure 3 In the electrochemical energy storage system provided in some embodiments of this utility model, the control box 6 is used to control whether the electrical connection between the first battery cluster and the DC side of the first energy storage converter 7 is connected, and to control whether the electrical connection between the second battery cluster and the DC side of the second energy storage converter 8 is connected. For example, inside the control box 6, it is possible to control the connection between the first terminal group and the third terminal group, that is, the positive terminal BAT2+ in the first terminal group is connected to the positive terminal DC2+ in the third terminal group, and the negative terminal BAT2- in the first terminal group is connected to the negative terminal DC2- in the third terminal group, thereby realizing the electrical connection between the first battery pack and the first energy storage converter 7; and it is possible to control the connection between the second terminal group and the fourth terminal group, that is, the positive terminal BAT1+ in the second terminal group is connected to the positive terminal DC1+ in the fourth terminal group, and the negative terminal BAT1- in the second terminal group is connected to the negative terminal DC1- in the fourth terminal group, thereby realizing the electrical connection between the second battery pack and the second energy storage converter 8.

[0035] In this embodiment, the control box 6 is designed with two independent electrical main circuits, which can realize independent control of the first battery cluster and the second battery cluster.

[0036] Reference Figure 4 In some embodiments of the electrochemical energy storage system provided by this utility model, the distribution box 9 is equipped with a busbar. The AC side of the first energy storage converter 7 is electrically connected to the busbar via a first AC line group, and the AC side of the second energy storage converter 8 is electrically connected to the busbar via a second AC line group. For example, as... Figure 4 As shown, the A-phase, B-phase, C-phase, and N-line terminals on the AC side of PCS #2 are electrically connected to the four different terminals of the busbar in distribution box 9 via wires; similarly, the A-phase, B-phase, C-phase, and N-line terminals on the AC side of PCS #1 are electrically connected to the four different terminals of the busbar in distribution box 9 via wires.

[0037] In the electrochemical energy storage system provided in some embodiments of this utility model, the power distribution box 9 is equipped with a protection device, and the busbar is located on the incoming side of the protection device.

[0038] In this embodiment, by setting a busbar, the AC side of the first energy storage converter 7 and the AC side of the second energy storage converter 8 can be combined to gather the currents of the first battery cluster and the second battery cluster, and the two clusters can be connected to the outside with a single wire. Furthermore, the busbar is set on the incoming side of the protection device, which can simultaneously cut off the fault current in the event of a fault in both clusters.

[0039] Reference Figure 2In the electrochemical energy storage system provided in some embodiments of this utility model, a battery monitoring module is installed inside the control box 6. The battery monitoring module and multiple battery packs are connected in series via shielded communication cables. Exemplarily, the communication terminal corresponding to the battery monitoring module in the control box 6 is connected to the communication port XS1 of battery pack PACK10 via a shielded communication cable. The communication port XS2 of battery pack PACK10 is connected to the communication port XS1 of battery pack PACK9 via a shielded communication cable. The communication port XS2 of battery pack PACK9 is connected to the communication port XS1 of battery pack PACK8 via a shielded communication cable. The communication port XS2 of battery pack PACK8 is connected to the communication port XS1 of battery pack PACK7 via a shielded communication cable. The communication port XS2 of battery pack PACK7 is connected to the communication terminal of battery pack PACK6 via a shielded communication cable. Communication ports XS1 and XS2 of battery pack PACK6 are connected to communication ports XS1 of battery pack PACK5 via shielded communication cables. Communication ports XS2 of battery pack PACK5 are connected to communication ports XS1 of battery pack PACK4 via shielded communication cables. Communication ports XS2 of battery pack PACK4 are connected to communication ports XS1 of battery pack PACK3 via shielded communication cables. Communication ports XS2 of battery pack PACK3 are connected to communication ports XS1 of battery pack PACK2 via shielded communication cables. Communication ports XS2 of battery pack PACK2 are connected to communication ports XS1 of battery pack PACK1 via shielded communication cables.

[0040] In this embodiment, the control box 6 obtains the operating status of each battery pack through the battery monitoring module, and controls the first battery pack and the second battery pack to operate independently according to the status of the first battery pack and the second battery pack respectively. The control logic realizes fault switching, and the other pack can still operate normally even if one pack fails.

[0041] Reference Figure 2 In the electrochemical energy storage system provided in some embodiments of this utility model, the control box 6 is connected to the first energy storage converter 7 and the second energy storage converter 8 via communication lines. For example, the communication terminals of the corresponding battery monitoring modules in the control box 6 are connected to the 485 communication interfaces of PCS #2 and PCS #1 via network cables.

[0042] In this embodiment, the control box 6 can achieve coordinated control of the two AC / DC inverters, the first energy storage inverter 7 and the second energy storage inverter 8, through its internal battery monitoring module.

[0043] Reference Figure 1In the electrochemical energy storage system provided in some embodiments of this utility model, the first battery cluster is located on the left side of the first chamber, and the second battery cluster is located on the right side of the first chamber; the control box 6, the first energy storage converter 7, and the second energy storage converter 8 are located on the left side of the second chamber; and the power distribution box 9 is located on the right side of the second chamber.

[0044] Reference Figure 1 In the electrochemical energy storage system provided in some embodiments of this utility model, the first energy storage converter 7 is located above the second energy storage converter 8, and the control box 6 is located to the left of the first energy storage converter 7 and the second energy storage converter 8.

[0045] In this embodiment, by clarifying and optimizing the layout of the control box 6, the first energy storage converter 7, and the second energy storage converter 8 in the second chamber, the wiring between the control box 6 and the first battery cluster, the second battery cluster, the first energy storage converter 7, and the second energy storage converter 8 can be easily realized, reducing the wiring length and lowering the wiring difficulty.

[0046] Reference Figure 1 In some embodiments of the present invention, the electrochemical energy storage system also includes a liquid cooling unit 10 disposed on the right side of the second chamber and located above the power distribution box 9.

[0047] In this embodiment, by configuring a liquid cooling unit 10, liquid cooling can be used to cool the battery pack more reliably and efficiently, thereby improving the cooling effect.

[0048] Reference Figure 1 In some embodiments of the electrochemical energy storage system provided by this utility model, a fire-fighting device 13 is also included, which is disposed in the first chamber and located above the first battery cluster and the second battery cluster.

[0049] In this embodiment, the fire-fighting device 13 is installed above the first battery cluster and the second battery cluster. It can simultaneously extinguish and protect all battery clusters in the event of an abnormality in the battery pack, thus providing a reliable fire protection effect.

[0050] Reference Figure 1 In some embodiments of the electrochemical energy storage system provided by this utility model, a left cabinet door 2 and a right cabinet door 3 are also provided on the energy storage cabinet body 1. An indicator light 4 and an emergency stop switch device 5 are provided on the left cabinet door 2. Exemplarily, the indicator light 4 may include an audible and visual alarm, a running indicator light, and a fault indicator light, etc.

[0051] In this embodiment, the operational status of the system can be displayed intuitively and conveniently through the indicator light 4, and emergency disconnection can be achieved through the emergency stop switch device 5 when the system fails.

[0052] Reference Figure 1In the electrochemical energy storage system provided in some embodiments of this utility model, the right cabinet door 3 is equipped with a cooling fan, and the left cabinet door 2 and the right cabinet door 3 are also provided with air inlets and dust filters located at the air inlets.

[0053] In this embodiment, the cooling fan can further cool the battery pack, improving the cooling effect, and the dust filter at the air inlet can prevent insects and other small animals from entering, thus improving safety.

[0054] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. An electrochemical energy storage system, characterized in that, include: The energy storage cabinet has a first chamber and a second chamber that are isolated from each other. The first chamber corresponds to the upper middle area of ​​the energy storage cabinet, and the second chamber corresponds to the lower area of ​​the energy storage cabinet. Multiple battery packs are stacked in the first chamber to form a first battery cluster and a second battery cluster, and both the first battery cluster and the second battery cluster include several battery packs stacked sequentially from top to bottom; A control box is disposed in the second chamber. The control box is electrically connected to the first battery cluster via a first DC line group and to the second battery cluster via a second DC line group. A first energy storage converter is disposed in the second chamber, and the DC side of the first energy storage converter is electrically connected to the control box. A second energy storage converter is disposed in the second chamber, and the DC side of the second energy storage converter is electrically connected to the control box. The power distribution box is located in the second chamber and is electrically connected to the first energy storage converter and the second energy storage converter, respectively.

2. The electrochemical energy storage system according to claim 1, characterized in that, The control box is used to control whether the electrical connection between the first battery cluster and the DC side of the first energy storage converter is connected, and to control whether the electrical connection between the second battery cluster and the DC side of the second energy storage converter is connected.

3. The electrochemical energy storage system according to claim 1, characterized in that, The distribution box is equipped with a busbar. The AC side of the first energy storage converter is electrically connected to the busbar through a first AC line group, and the AC side of the second energy storage converter is electrically connected to the busbar through a second AC line group.

4. The electrochemical energy storage system according to claim 3, characterized in that, The distribution box is equipped with a protection device, and the busbar is located on the incoming side of the protection device.

5. The electrochemical energy storage system according to claim 1, characterized in that, The control box contains a battery monitoring module, and the battery monitoring module and the multiple battery packs are connected in series via shielded communication cables.

6. The electrochemical energy storage system according to claim 1, characterized in that, The control box is connected to the first energy storage converter and the second energy storage converter via communication lines.

7. The electrochemical energy storage system according to claim 1, characterized in that, The first battery cluster is located on the left side of the first chamber, and the second battery cluster is located on the right side of the first chamber; the control box, the first energy storage converter, and the second energy storage converter are located on the left side of the second chamber; the power distribution box is located on the right side of the second chamber.

8. The electrochemical energy storage system according to claim 7, characterized in that, The first energy storage converter is located above the second energy storage converter, and the control box is located to the left of the first energy storage converter and the second energy storage converter.

9. The electrochemical energy storage system according to claim 7, characterized in that, It also includes a liquid-cooled unit located on the right side of the second chamber and above the power distribution box.

10. The electrochemical energy storage system according to claim 1, characterized in that, It also includes a fire-fighting device located on the right side of the first chamber and above the first battery cluster and the second battery cluster.

11. The electrochemical energy storage system according to claim 1, characterized in that, It also includes a left cabinet door and a right cabinet door installed in the energy storage cabinet body, and the left cabinet door is equipped with an indicator light and an emergency stop switch.

12. The electrochemical energy storage system according to claim 11, characterized in that, The right cabinet door is equipped with a cooling fan, and the left and right cabinet doors are also equipped with air inlets and dust filters located at the air inlets.

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