An energy storage device and an energy storage system

Abstract

The application discloses an energy storage device and an energy storage system. The energy storage device comprises an electrical cabin and a battery cabin. The electrical cabin has a first end and a second end arranged opposite to each other along a first direction. The battery cabin is connected with the second end of the electrical cabin. The electrical cabin has an electrical cabin chamber and an opening part in communication with the electrical cabin chamber. The opening part is arranged on an end surface of the first end of the electrical cabin. An electrical cabin door is arranged on the opening part. The electrical cabin chamber is provided with an electric control device.

Description

Technical Field

[0001] This application relates to the field of heat dissipation equipment technology, and more specifically, to an energy storage device and energy storage system. Background Technology

[0002] In recent years, the domestic energy storage market demand has been continuously increasing, the energy storage industry has been rapidly expanding, and energy storage equipment has played an increasingly prominent role in energy application scenarios. Energy storage equipment is an indispensable infrastructure for the development of microgrids, isolated grids, distributed generation systems, and fast charging technology for new energy vehicles. Among energy storage equipment, energy storage containers are highly favored due to their convenient installation, small footprint, and flexible mobility.

[0003] In existing energy storage containers, there are generally two battery compartments, with an electrical compartment sandwiched between them. This means the electrical compartment has two surfaces in contact with the battery compartments. If a battery in one of the battery compartments experiences thermal runaway and water is needed to cool the battery compartment, the electrical compartment is at risk of water entering from both directions.

[0004] In summary, the layout of energy storage containers in existing technologies has its shortcomings. Therefore, it is necessary to propose a new technical solution to improve the layout of energy storage containers. Summary of the Invention

[0005] One objective of this application is to provide a new technology solution for an energy storage device and energy storage system.

[0006] According to a first aspect of this application, an energy storage device is provided, the energy storage device comprising:

[0007] An electrical compartment having a first end and a second end disposed opposite to each other along a first direction;

[0008] A battery compartment, which is connected to the second end of the electrical compartment;

[0009] The electrical compartment has an electrical chamber and an opening communicating with the electrical chamber. The opening is located on the end face of the first end of the electrical compartment, and an electrical door is provided in the opening. The electrical chamber is equipped with electrical control devices.

[0010] Optionally, the electronic control device includes:

[0011] First Battery Management System Group;

[0012] A second battery management system group, wherein the first battery management system group and the second battery management system group are spaced apart along a second direction, the second direction being perpendicular to the first direction; and

[0013] An electrical connector is disposed between the first battery management system group and the second battery management system group, and is electrically connected to both the first battery management system group and the second battery management system group.

[0014] Optionally, the first battery management system group and the second battery management system group are arranged symmetrically.

[0015] Optionally, the first battery management system group includes:

[0016] Multiple battery management systems, each of which has an electrical connection interface that is electrically connected to a battery module disposed within the battery compartment.

[0017] Optionally, the electrical connection interface of the battery management system is electrically connected to the battery module via a power harness, and the electrical connection interface is located on the end face of the battery management system near the battery compartment.

[0018] Optionally, the charge / discharge rate of the battery module installed in the battery compartment is a first rate;

[0019] The energy storage device is equipped with a first set of external connection ports and a second set of external connection ports; wherein...

[0020] The positive terminal of the battery management system in the first battery management system group is electrically connected to the positive terminal of the external connection port of the first group through an electrical connector, and the negative terminal of the battery management system in the first battery management system group is electrically connected to the negative terminal of the external connection port of the first group through the electrical connector.

[0021] The positive terminal of the battery management system in the second battery management system group is electrically connected to the positive terminal of the second group of external connection ports through the electrical connector, and the negative terminal of the battery management system in the second battery management system group is electrically connected to the negative terminal of the second group of external connection ports through the electrical connector.

[0022] Optionally, the electrical connector includes a first busbar group and a second busbar group;

[0023] The first busbar group is located close to the first battery management system group, and the battery management system in the first battery management system group is electrically connected to the external connection port of the first group through the first busbar group;

[0024] The second busbar is located close to the second battery management system group, and the battery management system in the second battery management system group is electrically connected to the external connection port of the second group through the second busbar.

[0025] Optionally, the first bus group includes:

[0026] The first sub-bus, wherein the positive terminal of the battery management system in the first battery management system group is electrically connected to the positive port of the external connection port of the first group through the first sub-bus; and

[0027] The second sub-busbar is insulated from the first sub-busbar. The negative terminal of the battery management system in the first battery management system group is electrically connected to the negative terminal of the external connection port of the first group through the second sub-busbar.

[0028] Optionally, the first sub-busbar and the second sub-busbar are arranged along a first direction and connected to each other by a first insulating post.

[0029] Optionally, the charge / discharge rate of the battery installed in the battery compartment is a second rate, which is less than the first rate, and the energy storage device is provided with a third set of external connection ports;

[0030] The positive terminals of the battery management systems in the first and second battery management systems are electrically connected to the positive terminals of the third group of external connection ports via electrical connectors.

[0031] The negative terminals of the battery management systems in the first and second battery management systems are electrically connected to the negative terminals of the third group of external connection ports via the electrical connector.

[0032] Optionally, the electrical connector includes a third bus group and a fourth bus group, wherein the third bus group and the fourth bus group are insulated from each other;

[0033] The positive terminal of the battery management system in the first battery management system group and the second battery management system group is electrically connected to the positive terminal of the external connection port of the third group through the third bus group;

[0034] The negative terminal of the battery management system in the first battery management system group and the second battery management system group is electrically connected to the negative terminal of the external connection port of the third group through the fourth bus group.

[0035] Optionally, at least one of the first set of external connection ports and the second set of external connection ports includes a DC cable. The electrical connector is connected to an external energy storage converter via the DC cable. An inlet hole is provided at the bottom of the electrical compartment. A portion of the DC cable passes through the inlet hole and is disposed in the electrical compartment. The DC cable extends in the electrical compartment along a third direction. The first direction and the third direction are perpendicular to each other.

[0036] Optionally, the electrical compartment is provided with a protective panel that covers at least a portion of the surfaces of the electrical control devices facing the opening.

[0037] Optionally, along the first direction, the ratio of the size of the battery compartment to the size of the electrical compartment is A1, where 10:1 ≤ A1 ≤ 20:1.

[0038] Optionally, the energy storage device further includes a temperature regulating chamber, which is connected to the end of the battery compartment away from the electrical compartment, and the electrical compartment, the battery compartment, and the temperature regulating chamber are arranged sequentially along a first direction.

[0039] According to a second aspect of this application, an energy storage system is provided, the energy storage system comprising a plurality of energy storage devices as described in the first aspect, the plurality of energy storage devices being electrically connected to each other.

[0040] The technical solution adopted in this application can achieve the following beneficial effects:

[0041] In the energy storage device provided in this application embodiment, the electrical compartment has only one side in contact with the battery compartment. In this way, when the battery installed in the battery compartment experiences thermal runaway and water is needed to cool the battery compartment, the electrical compartment is only susceptible to water ingress from one direction, thereby reducing the risk of water ingress into the electrical compartment.

[0042] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0043] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present application and, together with their description, serve to explain the principles of the present application.

[0044] Figure 1 This is a schematic diagram of the overall structure of an energy storage device according to an embodiment of this application. Figure 1 ;

[0045] Figure 2 This is a schematic diagram of the overall structure of an energy storage device according to an embodiment of this application. Figure 2 ;

[0046] Figure 3 This is a schematic diagram of the electrical compartment in an energy storage device according to an embodiment of this application. Figure 1 ;

[0047] Figure 4 This is a schematic diagram of the electrical compartment in an energy storage device according to an embodiment of this application. Figure 2 ;

[0048] Figure 5This is a schematic diagram of the structure of the first busbar group and the second busbar group in an energy storage device according to an embodiment of this application. Figure 1 ;

[0049] Figure 6 This is a schematic diagram of the structure of the first busbar group and the second busbar group in an energy storage device according to an embodiment of this application. Figure 2 ;

[0050] Figure 7 This is a schematic diagram of the electrical compartment in an energy storage device according to an embodiment of this application. Figure 3 ;

[0051] Figure 8 This is a schematic diagram of the electrical connection principle in an energy storage device according to an embodiment of this application. Figure 1 ;

[0052] Figure 9 This is a schematic diagram of the electrical connection principle in an energy storage device according to an embodiment of this application. Figure 2 ;

[0053] Figure 10 This is a schematic diagram of the electrical connection principle in an energy storage device according to an embodiment of this application. Figure 3 .

[0054] Explanation of reference numerals in the attached figures:

[0055] 1. Electrical compartment; 100. Electrical compartment door; 101. Protective panel; 102. Cable support; 11. Battery management system; 12. First busbar group; 121. First sub-busbar; 122. Second sub-busbar; 120. First insulating column; 13. Second busbar group; 131. Third sub-busbar; 132. Fourth sub-busbar; 130. Second insulating column; 14. Third busbar group; 15. Fourth busbar group; 16. Distribution cabinet; 17. Lightning protection unit; 18. Fire alarm control panel; 19. Fire-fighting gas cylinder; 2. Battery compartment; 3. Temperature control compartment; 01. DC cable. Detailed Implementation

[0056] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0057] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0058] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0059] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0060] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0061] Reference Figures 1-7 As shown, according to one embodiment of this application, an energy storage device is provided. The energy storage device includes an electrical compartment 1, a battery compartment 2, and a temperature regulating compartment 3. The electrical compartment 1 has a first end and a second end disposed opposite to each other along a first direction; the battery compartment 2 is connected to the second end of the electrical compartment 1.

[0062] The electrical compartment 1 has an electrical chamber and an opening communicating with the electrical chamber. The opening is located on the end face of the first end of the electrical compartment 1. An electrical door 100 is provided in the opening. The electrical chamber is equipped with electrical control devices.

[0063] Optionally, the energy storage device further includes a temperature-regulating compartment 3, which is connected to the end of the battery compartment 2 away from the electrical compartment 1, and the electrical compartment 1, the battery compartment 2, and the temperature-regulating compartment 3 are arranged sequentially along a first direction. Optionally, the energy storage device can be an energy storage container.

[0064] In existing technologies, along the length of an energy storage container, one battery compartment, one electrical compartment, and another battery compartment are arranged sequentially, with the electrical compartment's door and maintenance surface located along the length of the container. In this arrangement, to increase battery capacity within the limited space of the battery compartment, the components in the electrical compartment need to be arranged as far along the width of the container as possible. However, when opening the door to maintain these components, many are located far behind the door, making maintenance inconvenient. Conversely, if components are placed as close to the door as possible at the front for easier maintenance, the electrical compartment occupies a significant amount of space along the container's length, encroaching on the space of the battery compartments on either side, thus hindering the overall battery capacity within the energy storage container. Furthermore, while this arrangement facilitates maintenance, it wastes a considerable amount of space along the width of the container, reducing the overall space utilization of the energy storage container.

[0065] In the energy storage device provided in the embodiments of this application, the electrical compartment 1, the battery compartment 2 and the temperature regulating compartment 3 are arranged sequentially along a first direction corresponding to the length direction of the energy storage device; that is, the battery compartment 2 is sandwiched between the electrical compartment 1 and the temperature regulating compartment 3, and the electrical compartment 1 is located at the end of the energy storage device.

[0066] The advantages of the above layout are as follows: First, in this energy storage device, the electrical compartment door 100 of the electrical compartment 1 is located on the end face away from the first end of the battery compartment 2. In this way, all the electrical control devices installed in the electrical compartment of the electrical compartment 1 are arranged close to the electrical compartment door 100, which can reserve more space behind the electrical compartment door 100 for the battery compartment 2 as much as possible, thereby helping to increase the capacity of the batteries installed in the battery compartment 2.

[0067] Furthermore, all the electrical control devices installed in the electrical compartment are arranged close to the electrical compartment door 100. When the electrical compartment door 100 is opened, all the electrical control devices installed in the electrical compartment are exposed, which makes it convenient to debug, repair and replace the electrical control devices.

[0068] Secondly, the electrical compartment 1 has only one side in contact with the battery compartment 2, that is, the end face of the second end of the electrical compartment 1 is in contact with the battery compartment 2. In this way, if the battery installed in the battery compartment 2 experiences thermal runaway and water is needed to cool the battery compartment 2, the electrical compartment 1 will only have the possibility of water entering from one direction, thereby reducing the risk of water entering the electrical compartment 1.

[0069] Reference Figure 1 The direction shown as 'a' is the first direction mentioned above, and the direction shown as 'b' is the second direction mentioned above.

[0070] In one embodiment, the electronic control device includes a first battery management system group, a second battery management system group, and an electrical connector. The first battery management system group and the second battery management system group are spaced apart along a second direction, which is perpendicular to the first direction. The electrical connector is disposed between the first battery management system group and the second battery management system group, and is electrically connected to both the first battery management system group and the second battery management system group.

[0071] Optionally, the first battery management system group may include one battery management system or multiple battery management systems; the second battery management system group may include one battery management system or multiple battery management systems.

[0072] In addition, the electrical control devices also include a power distribution cabinet 16, a lightning protection unit 17, and a fire control panel 18; the first battery management system group and the second battery management system group are located in the upper part of the electrical compartment, and the power distribution cabinet 16 is located below the first battery management system group; the lightning protection unit 17 and the fire control panel 18 are located below the second battery management system group in sequence; a fire-fighting gas cylinder 19 is also provided in the lower right corner of the electrical compartment.

[0073] In this specific example, the electrical control devices installed in the electrical compartment 1, namely the first battery management system group, the second battery management system group, electrical connectors, the distribution cabinet 16, the lightning protection unit 17, and the fire alarm control panel 18, are arranged in a planar layout. As mentioned above, when the electrical compartment door 100 is opened, all the electrical control devices installed in the electrical compartment 1 are exposed. This is because all the electrical control devices are arranged along a second direction and a third direction, where the second direction corresponds to the width direction of the energy storage device, and the third direction corresponds to the height direction of the energy storage device.

[0074] More specifically, the first battery management system group, electrical connectors, and the second battery management system group are arranged along the second direction; along the third direction, the power distribution cabinet 16 is located below the first battery management system group; the lightning protection unit 17 and the fire alarm control panel 18 are located below the second battery management system group in sequence.

[0075] If the electronic control devices are arranged along a first direction, for example, electronic control device I and electronic control device II are arranged along the first direction, with electronic control device I located near the opening of the electrical compartment 1 and electronic control device II located away from the opening of the electrical compartment 1, then when the electrical compartment door 100 is opened, electronic control device I is exposed through the opening, but electronic control device II is at least partially hidden behind electronic control device I, making it inconvenient to operate electronic control device II. However, the layout of the electronic control devices in the embodiment of this application does not have this problem.

[0076] Furthermore, the layout of the electronic control devices in this embodiment is conducive to saving space along the length direction (first direction) of the energy storage device, thereby allowing more space to be reserved for the battery compartment 2.

[0077] Reference Figure 1 As shown, the first direction mentioned above is Figure 1 In the direction 'a', the second direction is... Figure 1 In the b direction, the third direction is Figure 1 The c-direction in the middle.

[0078] In one embodiment, the first battery management system group and the second battery management system group are symmetrically arranged; for example, the first battery management system group and the second battery management system group are symmetrically arranged with respect to the central axis of the electrical compartment in a second direction, and the first direction and the second direction are perpendicular to each other.

[0079] In this specific example, the first battery management system group and the second battery management system group are symmetrically arranged with respect to the central axis of the electrical compartment in the second direction. The symmetrical arrangement is more aesthetically pleasing and has greater versatility.

[0080] In one embodiment, the first battery management system group includes a plurality of battery management systems 11, and the electrical connection interface of each battery management system 11 is electrically connected to a battery module disposed in the battery compartment 2.

[0081] In this specific example, each battery management system 11 is electrically connected to a battery module and controls the battery module; that is, the battery management system 11 corresponds one-to-one with the battery module set in the battery compartment 2, so that the battery management system 11 can play a better control role over the battery module.

[0082] In one embodiment, the electrical connection interface of the battery management system 11 is electrically connected to the battery module via a power harness, and the electrical connection interface is located on the end face of the battery management system 11 near the battery compartment 2.

[0083] In this specific example, the electrical connection interface of the battery management system 11 is electrically connected to the battery module through the power wiring harness; and the electrical connection interface of the battery management system 11 is located on the end face of the battery management system 11 near the battery compartment 2, which facilitates the connection between the battery management system 11 and the battery module and makes the arrangement of the power wiring harness more neat.

[0084] Optionally, the first battery management system group and the second battery management system group each include 1 to 4 battery management systems (BMS) 11; refer to Figure 3 As shown, eight battery management systems 11 can be set up according to actual needs, of which four battery management systems 11 are set up as the first battery management system group on the upper left side of the electrical compartment; and the other four battery management systems 11 are set up as the second battery management system group on the upper right side of the electrical compartment.

[0085] Each battery management system 11 is bolted to a column inside the electrical compartment, allowing for easy installation and replacement from the front of the maintenance side. The rear end of the battery management system 11, away from the opening of the electrical compartment 1, is connected to the battery modules in the battery compartment 2 via a power harness.

[0086] In one embodiment, the charge / discharge rate of the battery module disposed within the battery compartment 2 is a first rate; the energy storage device is provided with a first set of external connection ports and a second set of external connection ports; wherein...

[0087] The positive terminal of the battery management system 11 in the first battery management system group is electrically connected to the positive terminal of the first group of external connection ports via an electrical connector, and the negative terminal of the battery management system 11 in the first battery management system group is electrically connected to the negative terminal of the first group of external connection ports via the same electrical connector. Optionally, there may be one battery management system 11 in the first battery management system group, and the positive / negative terminal of the battery management system 11 is the positive / negative terminal of that one battery management system 11. Alternatively, there may be multiple battery management systems 11 in the first battery management system group, and the positive / negative terminal of each battery management system 11 may be the positive / negative terminal of multiple battery management systems 11.

[0088] The positive terminal of the battery management system 11 in the second battery management system group is electrically connected to the positive terminal of the second group of external connection ports via the electrical connector, and the negative terminal of the battery management system 11 in the second battery management system group is electrically connected to the negative terminal of the second group of external connection ports via the electrical connector. Optionally, there can be one battery management system 11 in the second battery management system group, and the positive / negative terminal of the battery management system 11 is the positive / negative terminal of that one battery management system 11; there can also be multiple battery management systems 11 in the second battery management system group, and the positive / negative terminals of the battery management system 11 are the positive / negative terminals of multiple battery management systems 11.

[0089] In this specific example, when the charge / discharge rate of the battery module is a relatively large first rate, two sets of external connection ports are used, namely the first set of external connection ports and the second set of external connection ports. The first set of external connection ports is electrically connected to the battery management system 11 in the first battery management system group through an electrical connector; the second set of external connection ports is electrically connected to the battery management system 11 in the second battery management system group through an electrical connector.

[0090] Optionally, the aforementioned first multiplier may be, for example, a 1C multiplier.

[0091] Reference Figure 4 As shown, in one embodiment, the electrical connector includes a first bus group 12 and a second bus group 13;

[0092] The first busbar group 12 is located close to the first battery management system group, and the battery management system 11 in the first battery management system group is electrically connected to the external connection port of the first group through the first busbar group 12;

[0093] The second busbar group 13 is located close to the second battery management system group, and the battery management system 11 in the second battery management system group is electrically connected to the external connection port of the second group through the second busbar group 13.

[0094] More specifically, refer to Figure 5 , Figure 6 As shown, the first busbar group 12 includes:

[0095] The first sub-bus 121 connects the positive terminal of the battery management system 11 in the first battery management system group to the positive terminal of the external connection port of the first group via the first sub-bus 121; and

[0096] The second sub-busbar 122 is insulated from the first sub-busbar 121. The negative terminal of the battery management system 11 in the first battery management system group is electrically connected to the negative terminal of the external connection port of the first group through the second sub-busbar 122.

[0097] In one embodiment, the first sub-bus 121 and the second sub-bus 122 are arranged along a first direction and are connected by a first insulating post 120.

[0098] In this specific example, the first sub-bus 121 and the second sub-bus 122 are arranged along a first direction and connected by a first insulating post 120. This arrangement can meet the creepage distance and electrical clearance of the first sub-bus 121 and the second sub-bus 122.

[0099] In addition, the second bus group 13 includes:

[0100] The third sub-bus 131, through which the positive terminal of the battery management system 11 in the second battery management system group is electrically connected to the positive port of the second group of external connection ports; and

[0101] The fourth sub-bus 132 is insulated from the third sub-bus 131; the negative terminal of the battery management system 11 in the second battery management system group is electrically connected to the negative terminal of the second group of external connection ports through the fourth sub-bus 132.

[0102] For example, the third sub-bus 131 and the fourth sub-bus 132 are arranged along the first direction and connected by the second insulating post 130. This arrangement can meet the creepage distance and electrical clearance of the third sub-bus 131 and the fourth sub-bus 132.

[0103] When the battery charge / discharge rate is a relatively large first rate, the first bus group 12 is used to electrically connect the battery management system 11 in the first battery management system group to the first group of external connection ports; and the second bus group 13 is used to electrically connect the battery management system 11 in the second battery management system group to the second group of external connection ports.

[0104] Specifically, the first sub-bus 121 in the first bus group 12 is responsible for electrically connecting the positive terminal of the battery management system 11 in the first battery management system group to the positive port of the first group of external connection ports, and the second sub-bus 122 in the first bus group 12 is responsible for electrically connecting the negative terminal of the battery management system 11 in the first battery management system group to the negative port of the first group of external connection ports.

[0105] The third sub-bus 131 in the second bus group 13 is responsible for electrically connecting the positive terminal of the battery management system 11 in the second battery management system group to the positive port of the second group of external connection ports, and the fourth sub-bus 132 in the second bus group 13 is responsible for electrically connecting the negative terminal of the battery management system 11 in the second battery management system group to the negative port of the second group of external connection ports.

[0106] In one embodiment, the charge / discharge rate of the battery installed in the battery compartment 2 is a second rate, which is less than the first rate, and the energy storage device is provided with a third set of external connection ports.

[0107] The positive terminal of the battery management system 11 in the first battery management system group and the second battery management system group is electrically connected to the positive terminal of the third group of external connection ports through an electrical connector.

[0108] The negative terminal of the battery management system 11 in the first battery management system group and the second battery management system group is electrically connected to the negative terminal of the third group of external connection ports through the electrical connector.

[0109] For example, the second rate can be 0.5C; when the battery's charge / discharge rate is a relatively small second rate, the energy storage device is connected to a set of external connection ports, i.e., a third set of external connection ports. The battery management systems 11 in both the first and second battery management systems are electrically connected to the third set of external connection ports via electrical connectors.

[0110] Reference Figure 4 As shown, in one embodiment, the electrical connector includes a third bus group 14 and a fourth bus group 15, wherein the third bus group 14 and the fourth bus group 15 are insulated from each other.

[0111] The positive terminal of the battery management system 11 in the first battery management system group and the second battery management system group is electrically connected to the positive terminal of the third group of external connection ports through the third bus group 14.

[0112] The negative terminal of the battery management system 11 in the first battery management system group and the second battery management system group is electrically connected to the negative terminal of the third group of external connection ports through the fourth bus group 15.

[0113] In this specific example, when the battery charge / discharge rate is a relatively small second rate, only two buses need to be set up. That is, unlike the first bus group 12 and the second bus group 13, which also include sub-buses, the third bus group 14 and the fourth bus group 15 are both single buses.

[0114] Specifically, a third busbar group 14 is used to electrically connect the positive terminals of all battery management systems 11 in the first battery management system group and the second battery management system group to the positive terminal of the third external connection port; a fourth busbar group 15 is used to electrically connect the negative terminals of all battery management systems 11 in the first battery management system group and the second battery management system group to the negative terminal of the third external connection port.

[0115] Furthermore, the battery management system 11 is connected to an external wiring port via an electrical connector, and then to a PCS (energy storage converter). The PCS then connects to an external power supply device, where it converts AC and DC power. The current flowing through the battery management system (BMS) 11 will vary depending on the user's different requirements for the charge / discharge rate of the batteries installed in the battery compartment 2 of the energy storage device.

[0116] In summary, when the battery's charge / discharge rate is a relatively high first rate, two sets of external connection ports are used; when the battery's charge / discharge rate is a relatively low second rate, only one set of external connection ports is needed.

[0117] In the energy storage device provided in this application embodiment, the battery management system 11 on the left and the battery management system 11 on the right are arranged symmetrically. The symmetrical arrangement is more aesthetically pleasing and has greater versatility. In addition, when the user's requirements for the charge / discharge rate of the batteries installed in the battery compartment 2 of the energy storage device change, only minor modifications to the structure of the electrical connectors are needed, without changing the structure and position of the other electronic control components, thus enhancing its compatibility.

[0118] In one embodiment, at least one of the first set of external connection ports and the second set of external connection ports includes a DC cable 01. The electrical connector is connected to an external energy storage converter through the DC cable 01. An inlet hole is provided at the bottom of the electrical compartment 1. A portion of the DC cable 01 passes through the inlet hole and is disposed in the electrical compartment. The DC cable 01 extends in the electrical compartment along a third direction. The first direction and the third direction are perpendicular to each other.

[0119] More specifically, refer to Figure 8 As shown, the end of the first sub-bus 121 is connected to the positive cable in the first group of DC cables and then to the PCS, and the end of the second sub-bus 122 is connected to the negative cable in the first group of DC cables and then to the PCS. When there are four battery management systems 11 in the first battery management system group, there are four positive cables and four negative cables in the first group of DC cables.

[0120] The end of the third sub-bus 131 is connected to the positive cable in the second group of DC cables and then to the PCS. The end of the fourth sub-bus 132 is connected to the negative cable in the second group of DC cables and then to the PCS. When there are four battery management systems 11 in the second battery management system group, there are four positive and four negative cables in the second group of DC cables.

[0121] Reference Figure 4 As shown, A represents the rear end of the battery management system 11; B represents the connection point between the battery management system 11 and the first busbar group 12 in the first battery management system group; C represents the connection point between the battery management system 11 and the second busbar group 13 in the second battery management system group; D represents the connection point between the first busbar group 12 and the first DC cable 01; and E represents the connection point between the second busbar group 13 and the second DC cable 01.

[0122] Reference Figure 9 As shown, the end of the third busbar group 14 is connected to the positive cable in the DC cable and then to the PCS, and the end of the fourth busbar group 15 is connected to the negative cable in the DC cable and then to the PCS. When the number of battery management systems 11 in both the first battery management system group and the second battery management system group is four, there are four positive cables and four negative cables in the DC cable.

[0123] More specifically, the aforementioned first sub-bus 121, second sub-bus 122, third sub-bus 131, fourth sub-bus 132; and third bus group 14 and fourth bus group 15, all busbars include a main busbar extending in a third direction and a busbar branch connected to the side of the main busbar; wherein the busbar branch is used to connect to each battery management system 11, and the end of the main busbar is connected to a DC cable.

[0124] In addition, the main busbars of the third busbar group 14 and the main busbars of the fourth busbar group 15 can be arranged at intervals along the first direction and connected by insulating posts.

[0125] Reference Figure 10As shown, when the charge / discharge rate of the battery is further reduced, for example to the third rate (0.25C), the electrical connection can be configured exactly the same as when the charge / discharge rate of the battery is the second rate, that is, the electrical connection includes the third bus group 14 and the fourth bus group 15.

[0126] The difference between the third and second rates is that, at the smaller third rate, the dimensions of the third bus group 14 and the fourth bus group 15 can be reduced, for example, their width can be narrowed; and smaller PCS models can be used, and the number of DC cables can be reduced accordingly, for example, there are two positive and two negative DC cables. Of course, the same third bus group 14 and fourth bus group 15 as those in the second rate can also be used as electrical connectors in the third rate.

[0127] In summary, when the user's requirements for the charge / discharge rate of the batteries installed in the battery compartment 2 of the energy storage device change, only minor modifications to the structure of the electrical connectors are needed, without altering the structure and position of the remaining electronic control components. Therefore, the battery management system 11 has strong expandability and compatibility under different charge / discharge rates, and can better meet the different needs of users.

[0128] Reference Figure 3 As shown, in one embodiment, the electrical connector is connected to the PCS via a DC cable 01, which in turn connects to an external power supply device. The bottom of the electrical compartment 1 has an inlet hole, a portion of the DC cable 01 passes through the inlet hole and is disposed in the electrical compartment, and the DC cable 01 extends in a third direction in the electrical compartment.

[0129] In this specific example, the DC cable 01 is arranged vertically along a third direction within the electrical compartment 1, requiring no bending and making installation convenient and quick. Furthermore, the end of the DC cable 01 can be secured to the cable bracket 102 inside the electrical compartment using cable ties, preventing the weight of the DC cable 01 from damaging the busbar structure.

[0130] Reference Figure 3 As shown, in one embodiment, the electrical compartment is provided with a protective panel 101, which covers at least a portion of the surface of the electrical control device facing the opening.

[0131] In this specific example, the protective panel 101 can protect the operator and improve operational safety; for example, the protective panel 101 can be placed in front of the busbar and at the connection point between the busbar and the DC cable. Optionally, the protective panel 101 can be bolted to the mounting holes of the BMS for easy maintenance and disassembly. Furthermore, the protective panel 101 is a transparent PC board.

[0132] In one embodiment, along a first direction, the ratio of the size of the battery compartment 2 to the size of the electrical compartment 1 is A1, where 10:1 ≤ A1 ≤ 20:1.

[0133] In this specific example, the energy storage device is arranged along the first direction as much as possible in the battery compartment 2, which increases the volume of the battery compartment and thus increases the capacity of the battery module.

[0134] According to another embodiment of this application, an energy storage system is provided, the energy storage system including a plurality of energy storage devices as described above, the plurality of energy storage devices being electrically connected to each other.

[0135] The above embodiments mainly describe the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be elaborated here.

[0136] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. An energy storage device, characterized in that, The energy storage device includes: An electrical compartment (1) having a first end and a second end disposed opposite to each other along a first direction; Battery compartment (2), which is connected to the second end of electrical compartment (1); The electrical compartment (1) has an electrical chamber and an opening communicating with the electrical chamber. The opening is located on the end face of the first end of the electrical compartment (1). An electrical door (100) is provided in the opening. The electrical chamber is equipped with electrical control devices. The electronic control device includes: a first battery management system group and a second battery management system group; The energy storage device is equipped with a first set of external connection ports, a second set of external connection ports and a third set of external connection ports; When the charge / discharge rate of the battery module installed in the battery compartment (2) is the first rate, the positive terminal of the battery management system (11) in the first battery management system group is electrically connected to the positive terminal of the first group of external connection ports through the electrical connector, and the negative terminal of the battery management system (11) in the first battery management system group is electrically connected to the negative terminal of the first group of external connection ports through the electrical connector; the positive terminal of the battery management system (11) in the second battery management system group is electrically connected to the positive terminal of the second group of external connection ports through the electrical connector, and the negative terminal of the battery management system (11) in the second battery management system group is electrically connected to the negative terminal of the second group of external connection ports through the electrical connector; When the charge / discharge rate of the battery installed in the battery compartment (2) is the second rate, the positive terminal of the battery management system (11) in the first battery management system group and the second battery management system group is electrically connected to the positive terminal of the third group of external connection ports through the electrical connector; the negative terminal of the battery management system (11) in the first battery management system group and the second battery management system group is electrically connected to the negative terminal of the third group of external connection ports through the electrical connector. The second multiplier is less than the first multiplier.

2. The energy storage device according to claim 1, characterized in that, The first battery management system group and the second battery management system group are arranged at intervals along a second direction, wherein the second direction is perpendicular to the first direction; and An electrical connector is disposed between the first battery management system group and the second battery management system group, and is electrically connected to both the first battery management system group and the second battery management system group.

3. The energy storage device according to claim 2, characterized in that, The first battery management system group and the second battery management system group are arranged symmetrically.

4. The energy storage device according to claim 2, characterized in that, The first battery management system group includes: Multiple battery management systems (11), each of which has an electrical connection interface that is electrically connected to a battery module disposed in the battery compartment (2).

5. The energy storage device according to claim 4, characterized in that, The electrical connection interface of the battery management system (11) is electrically connected to the battery module through a power harness. The electrical connection interface is located on the end face of the battery management system (11) near the battery compartment (2).

6. The energy storage device according to claim 1, characterized in that, The electrical connector includes a first bus group (12) and a second bus group (13); The first busbar group (12) is located close to the first battery management system group, and the battery management system (11) in the first battery management system group is electrically connected to the external connection port of the first group through the first busbar group (12); The second busbar group (13) is located close to the second battery management system group, and the battery management system (11) in the second battery management system group is electrically connected to the external connection port of the second group through the second busbar group (13).

7. The energy storage device according to claim 6, characterized in that, The first busbar group (12) includes: The first sub-busbar (121) connects the positive terminal of the battery management system (11) in the first battery management system group to the positive terminal of the external connection port of the first group via the first sub-busbar (121); and The second sub-bus (122) is insulated from the first sub-bus (121). The negative terminal of the battery management system (11) in the first battery management system group is electrically connected to the negative terminal of the external connection port of the first group through the second sub-bus (122).

8. The energy storage device according to claim 7, characterized in that, The first sub-busbar (121) and the second sub-busbar (122) are arranged along a first direction and are connected by a first insulating post (120).

9. The energy storage device according to claim 1, characterized in that, The electrical connector includes a third bus group (14) and a fourth bus group (15), wherein the third bus group (14) and the fourth bus group (15) are insulated from each other; The positive terminal of the battery management system (11) in the first battery management system group and the second battery management system group is electrically connected to the positive terminal of the third group of external connection ports through the third bus group (14); The negative terminal of the battery management system (11) in the first battery management system group and the second battery management system group is electrically connected to the negative terminal of the third group of external connection ports through the fourth bus group (15).

10. The energy storage device according to claim 1, characterized in that, The electrical compartment is provided with a protective panel (101) that covers at least a portion of the surface of the electrical control device facing the opening.

11. The energy storage device according to claim 1, characterized in that, Along the first direction, the ratio of the size of the battery compartment (2) to the size of the electrical compartment (1) is A1, wherein, 10:1≤A1≤20:1。 12. The energy storage device according to claim 1, characterized in that, The energy storage device also includes a temperature regulating chamber (3), which is connected to the end of the battery compartment (2) away from the electrical compartment (1), and the electrical compartment (1), the battery compartment (2) and the temperature regulating chamber (3) are arranged in sequence along a first direction.

13. An energy storage system, characterized in that, The energy storage system includes a plurality of energy storage devices as described in any one of claims 1-12, and the plurality of energy storage devices are electrically connected to each other.

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