Energy storage device and energy storage system

Abstract

An energy storage system. The energy storage system comprises an energy storage device; and the energy storage device comprises a first battery case, a second battery case and a connector, wherein the first battery case comprises a first battery pack; the second battery case and the first battery case are arranged in a stacked manner, and the second battery case comprises a second battery pack; and the connector comprises a first connector and a second connector, the first battery case and the second battery case are provided with the first connector, and the first battery case is further provided with the second connector. One end of the first connector of the first battery case is electrically connected to other devices; the other end of the first connector of the first battery case is electrically connected to one of positive and negative electrodes of the first battery pack; the other of the positive and negative electrodes of the first battery pack is electrically connected to one end of the second connector of the first battery case; the other end of the second connector of the first battery case is electrically connected to one end of the first connector of the second battery case; and the other end of the first connector of the second battery case is electrically connected to positive and negative electrodes of the second battery pack.

Description

Energy storage devices and energy storage systems

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese patent application No. 202421228028.6, filed with the China National Intellectual Property Administration on May 30, 2024, entitled “Energy Storage Device and Energy Storage System”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of energy storage technology, and in particular to an energy storage device and an energy storage system. Background Technology

[0004] In related technologies, energy storage devices require a base to house the return line positions, resulting in low space utilization.

[0005] Public content

[0006] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes an energy storage device that eliminates the need for a base, thereby avoiding the need for a return line and improving the overall space utilization of the energy storage device.

[0007] This application further proposes an energy storage system.

[0008] The energy storage device according to this application includes: a first battery box, the first battery box including a first battery pack; a second battery box, the second battery box being stacked with the first battery box, the second battery box including a second battery pack; and a connector, the connector including a first connector and a second connector, the first battery box and the second battery box both being provided with the first connector, the first battery box also being provided with the second connector; one end of the first connector of the first battery box is adapted to be electrically connected to another device, the other end of the first connector of the first battery box is electrically connected to one of the positive and negative terminals of the first battery pack; the other of the positive and negative terminals of the first battery pack is electrically connected to one end of the second connector of the first battery box; the other end of the second connector of the first battery box is electrically connected to one end of the first connector of the second battery box; the other end of the first connector of the second battery box is electrically connected to the positive and negative terminals of the second battery pack.

[0009] According to the energy storage device of this application, in the second battery box, it is only necessary to electrically connect the positive and negative terminals of the other end of the first connector to the positive and negative terminals of the second battery pack, so that there is no need to set up a base, thereby avoiding the need to set up a return line position and improving the overall space utilization of the energy storage device.

[0010] In some examples of this application, the energy storage device further includes electrical connection lines, which include a positive connection line and a negative connection line; wherein, in the first battery box, one end of one of the positive connection line and the negative connection line is electrically connected to the first connector, the other end of the positive connection line and the negative connection line is electrically connected to the first battery pack, one end of the other of the positive connection line and the negative connection line is electrically connected to the first battery pack, and the other end of the other of the positive connection line and the negative connection line is electrically connected to the second connector; and / or in the second battery box, one end of the positive connection line and one end of the negative connection line are electrically connected to the first connector, and the other end of the positive connection line and the other end of the negative connection line are electrically connected to the second battery pack.

[0011] In some examples of this application, the first connector is provided with a first plug portion, and the second connector is provided with a second plug portion, wherein the first plug portion and the second plug portion are plugged into each other for electrical connection.

[0012] In some examples of this application, the first battery box further includes a first housing, the first battery pack being disposed within the first housing, and the second battery box further includes a second housing, the second battery pack being disposed within the second housing. In the first battery box, the first connector is disposed on the side of the first housing away from the second housing, and the second connector is disposed on the side of the first housing adjacent to the second housing. In the second battery box, the first connector is disposed on the side of the second housing adjacent to the first housing.

[0013] In some examples of this application, the energy storage device further includes a grounding element, which includes a first grounding element connected between the first connector and the first housing in the first battery box, and between the first connector and the second housing in the second battery box.

[0014] In some examples of this application, the energy storage device further includes a grounding element, which includes a first grounding element and a second grounding element, the second grounding element being connected to the second connector and the first grounding element.

[0015] In some examples of this application, the first connector or the second connector is provided with a mating portion, and the first grounding member is mated within the mating portion.

[0016] In some examples of this application, the energy storage device further includes a grounding structure disposed on the first connector or the second connector, and the first grounding element is connected to the grounding structure through the mating part.

[0017] In some examples of this application, the energy storage device further includes a first mounting bracket and a second mounting bracket, with the first mounting bracket connected to both the first housing and the second housing, and the second mounting bracket also connected to the first housing. The first connector is disposed on the first mounting bracket, the first grounding member is connected to the first mounting bracket, and the second connector is disposed on the second mounting bracket.

[0018] In some examples of this application, the first mounting bracket includes a main body and two mounting feet, the first connector is disposed on the main body, the two mounting feet are connected to both ends of the main body, the two mounting feet are respectively connected to the first housing, and the two mounting feet are respectively connected to the second housing.

[0019] In some examples of this application, the energy storage device further includes a first signal line and a second signal line, the first battery box further includes a first circuit board disposed on the first housing, in the first battery box, the first signal line is connected between the first connector and the first circuit board, the second signal line is connected between the second connector and the first circuit board, and / or the second battery box further includes a second circuit board disposed on the second housing, in the second battery box, the first signal line is connected between the first connector and the second circuit board.

[0020] In some examples of this application, the energy storage device further includes a power line, which is electrically connected between the first connector and the second connector in the first battery box.

[0021] The energy storage system according to this application includes: the energy storage device described above, wherein there are multiple first battery boxes, and the multiple first battery boxes are stacked together.

[0022] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0024] Figure 1 is a schematic diagram of the structure of an energy storage device according to an embodiment of this application;

[0025] Figure 2 is a schematic diagram of the first battery box;

[0026] Figure 3 is a schematic diagram of the second battery box;

[0027] Figure 4 is a cross-sectional view of the connector;

[0028] Figure 5 is a partial exploded view of an energy storage device according to an embodiment of this application;

[0029] Figure 6 is a schematic diagram of the second connector;

[0030] Figure 7 is a schematic block diagram of an energy storage system according to an embodiment of this application.

[0031] Reference numerals: 100, Energy storage system; 1, Energy storage device; 2, First battery box; 3, Second battery box; 4, Electrical connection wire; 10, Connector; 11, First connector; 111, Mating part; 12, Second connector; 20, Grounding component; 21, First grounding component; 22, Second grounding component; 30, First housing; 40, First mounting bracket; 41, Main body; 42, Mounting leg; 50, First circuit board; 60, First signal line; 70, First battery pack; 80, Positive connection wire; 90, Second signal line; 100, Negative connection wire; 110, Power line; 120, Grounding structure; 130, Second mounting bracket; 140, Second housing; 150, Second battery pack; 160, Second circuit board. Detailed Implementation

[0032] The embodiments of this application are described in detail below, and the embodiments described with reference to the accompanying drawings are exemplary.

[0033] The energy storage device 1 according to an embodiment of this application is described below with reference to Figures 1-6. The energy storage device 1 can supply power to corresponding electrical equipment.

[0034] As shown in Figures 1-4, the energy storage device 1 according to an embodiment of this application includes a first battery box 2, a second battery box 3, a connector 10, and an electrical connection line 4. The first battery box 2 and the second battery box 3 serve as energy storage components, the connector 10 primarily transmits signals, and the electrical connection line 4 provides electrical connection. The second battery box 3 is stacked with the first battery box 2, allowing the first battery box 2 and the second battery box 3 to be electrically connected together via the electrical connection line 4, thereby improving the energy storage effect of the energy storage device 1.

[0035] As shown in Figures 1-3, the first battery box 2 includes a first battery pack 70, and the second battery box 3 includes a second battery pack 150. The first battery box 2 stores energy through the first battery pack 70, and the second battery box 3 stores energy through the second battery pack 150. The connector 10 includes a first connector 11 and a second connector 12. Both the first battery box 2 and the second battery box 3 are provided with the first connector 11, and the first battery box 2 is also provided with the second connector 12. One end of the first connector 11 of the first battery box 2 is adapted for electrical connection to other devices, and the other end of the first connector 11 of the first battery box 2 is electrically connected to one of the positive and negative terminals of the first battery pack 70. The other positive and negative terminal of the first battery pack 70 is electrically connected to one end of the second connector 12 of the first battery box 2. The other end of the second connector 12 of the first battery box 2 is electrically connected to one end of the first connector 11 of the second battery box 3, and the other end of the first connector 11 of the second battery box 3 is electrically connected to the positive and negative terminals of the second battery pack 150. The first battery pack 70 includes at least one battery, and the positive and negative terminals of the first battery pack 70 are generally positive and generally negative.

[0036] In other words, the first connector 11 is disposed in both the first battery box 2 and the second battery box 3, and the second connector 12 is disposed in the first battery box 2. The second connector 12 located in the first battery box 2 is electrically connected to the first connector 11 located in the second battery box 3. That is, the first connector 11 is disposed inside both the first battery box 2 and the second battery box 3, while the second connector 12 is disposed only inside the first battery box 2. The second connector 12 located in the first battery box 2 is electrically connected to the first connector 11 located in the second battery box 3. This ensures that the first battery box 2 and the second battery box 3 can be electrically connected.

[0037] As shown in Figures 1-3, the electrical connection line 4 includes a positive connection line 80 and a negative connection line 100. Specifically, in the first battery box 2, one end of one of the positive connection line 80 and the negative connection line 100 is electrically connected to the first connector 11, and the other end of one of the positive connection line 80 and the negative connection line 100 is electrically connected to the first battery pack 70. One end of the other of the positive connection line 80 and the negative connection line 100 is electrically connected to the first battery pack 70, and the other end of the other of the positive connection line 80 and the negative connection line 100 is electrically connected to the second connector 12. And / or in the second battery box 3, one end of the positive connection line 80 and one end of the negative connection line 100 are electrically connected to the first connector 11, and the other ends of the positive connection line 80 and the negative connection line 100 are electrically connected to the second battery pack 150.

[0038] For example, in the first battery box 2, one end of the positive connection line 80 is electrically connected to the first connector 11, and the other end of the positive connection line 80 is electrically connected to the first battery pack 70. One end of the negative connection line 100 is electrically connected to the first battery pack 70, and the other end of the negative connection line 100 is electrically connected to the second connector 12. In this way, current can be introduced from the first connector 11 to the first battery pack 70 through the positive connection line 80, and then the current in the first battery pack 70 can be introduced to the second connector 12 through the negative connection line 100.

[0039] In the second battery box 3, one end of the positive connection line 80 is electrically connected to the first connector 11, and the other end of the positive connection line 80 is electrically connected to the second battery pack 150. Since the second connector 12 in the first battery box 2 is electrically connected to the first connector 11 in the second battery box 3, current can flow from the second connector 12 in the first battery box 2 to the first connector 11 in the second battery box 3. In the second battery box 3, current can then be introduced from the first connector 11 through the positive connection line 80 into the second battery pack 150. Thus, an electrical connection between the first battery pack 70 and the second battery pack 150 is achieved.

[0040] Therefore, in the second battery box 3, it is only necessary to electrically connect the positive and negative terminals of the other end of the first connector 11 to the positive and negative terminals of the second battery pack 150, so that there is no need to set up a base, thereby avoiding the need to set up a return line position and improving the overall space utilization of the energy storage device 1.

[0041] The first connector 11 has a first insertion part, and the second connector 12 has a second insertion part. The first insertion part and the second insertion part are inserted into each other for electrical connection. The electrical connection between the first insertion part and the second insertion part enables the electrical connection between the second connector 12 of the first battery box 2 and the first connector 11 of the second battery box 3, thereby enabling the electrical connection between the first battery pack 70 and the second battery pack 150.

[0042] Furthermore, as shown in Figures 1-3, the first battery box 2 also includes a first housing 30, and the first battery pack 70 is disposed within the first housing 30. The second battery box 3 also includes a second housing 140, and the second battery pack 150 is disposed within the second housing 140. In the first battery box 2, the first connector 11 is disposed on the side of the first housing 30 away from the second housing 140, and the second connector 12 is disposed on the side of the first housing 30 adjacent to the second housing 140. In the second battery box 3, the first connector 11 is disposed on the side of the second housing 140 adjacent to the first housing 30.

[0043] The first battery pack 70 is housed within the first housing 30 to protect it from damage. Similarly, the second battery pack 150 is housed within the second housing 140 to protect it from damage. In the first battery case 2, the first connector 11 is located on the side of the first housing 30 away from the second housing 140, and the second connector 12 is located on the side of the first housing 30 adjacent to the second housing 140. In the second battery case 3, the first connector 11 is located on the side of the second housing 140 adjacent to the first housing 30, facilitating electrical connection between the second connector 12 of the first battery case 2 and the first connector 11 of the second battery case 3.

[0044] Of course, as shown in Figures 2 and 3, the energy storage device 1 also includes a grounding component 20, which includes a first grounding component 21 and a second grounding component 22. In the first battery box 2, the first grounding component 21 is connected between the first connector 11 and the first housing 30, and the second grounding component 22 is connected between the second connector 12 and the first grounding component 21. In the second battery box 3, the first grounding component 21 is connected between the first connector 11 and the second housing 140.

[0045] Both the first grounding element 21 and the second grounding element 22 can conduct current. In the first battery box 2, the first grounding element 21 is connected between the first connector 11 and the first housing 30. Thus, when the first battery box 2 leaks current, the leakage current can be transmitted between the first connector 11, the first grounding element 21, and the first housing 30, facilitating transmission to the ground. Similarly, the second grounding element 22 is connected between the second connector 12 and the first grounding element 21. Likewise, when the first battery box 2 leaks current, the leakage current can be transmitted between the second connector 12, the second grounding element 22, the first grounding element 21, and the first housing 30, facilitating transmission to the ground. Likewise, in the second battery box 3, the first grounding element 21 is connected between the first connector 11 and the second housing 140. When the second battery box 3 leaks current, the leakage current can be transmitted between the first connector 11, the first grounding element 21, and the second housing 140, facilitating transmission to the ground. This ensures the safety of the first battery box 2 and the second battery box 3 in case of leakage.

[0046] Alternatively, as shown in Figures 5 and 6, the first connector 11 or the second connector 12 is provided with a mating part 111, within which the first grounding member 21 is fitted. The mating part 111 primarily serves an installation function, replacing the second grounding member 22. By fitting the first grounding member 21 within the mating part 111, the mating part 111 can be used to install and limit the first grounding member 21, facilitating a fixed connection between the first grounding member 21 and the second connector 12. Furthermore, the mating part 111 also provides some degree of clearance, preventing the portion of the first grounding member 21 that mates with the second connector 12 from protruding beyond the second connector 12, thus avoiding interference with other components and facilitating installation and setup. The mating part 111 can be a recessed structure.

[0047] Furthermore, as shown in Figure 5, the energy storage device 1 also includes a ground wire structure 120, which is disposed on the first connector 11 or the second connector 12. The first grounding element 21 is connected to the ground wire structure 120 through a mating part 111. The ground wire structure 120 primarily serves a conductive function. By placing the ground wire structure 120 on the first connector 11 or the second connector 12, the current within the first connector 11 or the second connector 12 can be led out through the ground wire structure 120. The first grounding element 21 is connected to the ground wire structure 120 through the mating part 111, so that the current within the first connector 11 or the second connector 12, after being led out to the ground wire structure 120, is then led out to the first grounding element 21, facilitating its output to the outside. Specifically, the first grounding element 21 is in contact with the first housing 30, thus the current led out from the ground wire structure 120 to the first grounding element 21 is transmitted to the first housing 30, facilitating current input to the ground and improving the safety of the energy storage device 1.

[0048] It should be noted that the ground wire structure 120 can replace the existing lead wire configuration, which can simplify the process, improve the installation efficiency of the first connector 11, and reduce the installation space and cost of the first connector 11.

[0049] Further, as shown in Figure 1, the energy storage device 1 also includes a first mounting bracket 40, a first connector 11 disposed on the first mounting bracket 40, and the first housing 30 and the second housing 140 are both connected to the first mounting bracket 40. The first grounding component 21 is connected to the first mounting bracket 40. The first mounting bracket 40 primarily serves a mounting function. Mounting the first connector 11 on the first mounting bracket 40 secures the first connector 11, making the connection between the first connector 11 and the first mounting bracket 40 more reliable and stable, allowing the first connector 11 to better perform its connection and conduction functions. The first mounting bracket 40 is connected to both the first housing 30 and the second housing 140, thus securing the first mounting bracket 40 and making its installation more reliable and stable, thereby allowing the first mounting bracket 40 to better support the first connector 11.

[0050] The first grounding component 21 is connected to the first mounting bracket 40, which makes the connection between the first grounding component 21 and the first mounting bracket 40 more stable and allows the first grounding component 21 to function better. It should be noted that the first mounting bracket 40 is fixedly connected to the first housing 30, allowing the current on the first grounding component 21 to be led out to the first housing 30 through the first mounting bracket 40, thus facilitating grounding operations. The first grounding component 21 and the first mounting bracket 40 can be fixedly connected by screws.

[0051] Specifically, as shown in Figures 1-3, the first mounting bracket 40 includes a main body 41 and two mounting legs 42. A first connector 11 is disposed on the main body 41, and the two mounting legs 42 are connected to both ends of the main body 41. The two mounting legs 42 are respectively connected to the first housing 30 and the second housing 140. The main body 41 is the main part of the first mounting bracket 40 and mainly serves as the mounting component, while the mounting legs 42 mainly serve as the supporting component. Specifically, the first connector 11 is mounted on the main body 41. It should be noted that the main body 41 is located on the upper side of the first battery box 2; therefore, placing the first connector 11 on the main body 41 is more reasonable and facilitates its cooperation with the corresponding components above it.

[0052] Two mounting feet 42 are respectively connected to the first housing 30 and the second housing 140, thus fixing the two mounting feet 42 and making their installation more secure and stable. The two mounting feet 42 are connected to both ends of the main body 41, allowing them to support the main body 41 from both ends, further stabilizing the main body 41 and enabling it to better support the first connector 11.

[0053] Additionally, as shown in Figure 5, the energy storage device 1 also includes a second mounting bracket 130, on which the second connector 12 is mounted. The second mounting bracket 130 is connected to the first housing 30. The second mounting bracket 130 primarily serves a mounting function. Mounting the second connector 12 on the second mounting bracket 130 secures it, making its installation more robust and stable, and allowing it to function better. The connection between the second mounting bracket 130 and the first housing 30 further secures the second mounting bracket 130, thus providing better support for the second connector 12.

[0054] Furthermore, as shown in Figures 1-3, the energy storage device 1 further includes a first signal line 60 and a second signal line 90, the first battery box 2 further includes a first circuit board 50 disposed on the first housing 30, and / or the second battery box 3 further includes a second circuit board 160 disposed on the second housing 140. In the first battery box 2, the first signal line 60 is connected between the first connector 11 and the first circuit board 50, and the second signal line 90 is connected between the second connector 12 and the first circuit board 50. In the second battery box 3, the first signal line 60 is connected between the first connector 11 and the second circuit board 160.

[0055] Both the first circuit board 50 and the second circuit board 160 serve to connect and transmit signals, as do the first signal line 60 and the second signal line 90. Placing the first circuit board 50 on the first housing 30 secures it, making its installation more robust and stable, and allowing it to function better. Similarly, placing the second circuit board 160 on the second housing 140 secures it, making its installation more robust and stable, and allowing it to function better.

[0056] In the first battery box 2, a first signal line 60 is connected between the first connector 11 and the first circuit board 50. This allows the first signal line 60 to transmit information collected by the first circuit board 50 to the first connector 11, and then to an external controller. A second signal line 90 is connected between the second connector 12 and the first circuit board 50, allowing signals to be transmitted between them. Similarly, in the second battery box 3, the first signal line 60 is connected between the first connector 11 and the second circuit board 160. This allows the first signal line 60 to transmit information collected by the second circuit board 160 to the first connector 11, and then to an external controller. It should be noted that the first circuit board 50 primarily collects parameters such as the status of the first battery pack 70, while the second circuit board 160 primarily collects parameters such as the status of the second battery pack 150, including, for example, the temperature and voltage of both the first and second battery packs 70 and 150.

[0057] Furthermore, as shown in Figure 3, the energy storage device 1 also includes a power line 110, which is electrically connected between the first connector 11 and the second connector 12 in the first battery box 2. The power line 110 primarily serves to transmit signals. By connecting the power line 110 between the first connector 11 and the second connector 12, signals can be transmitted between them, thereby enabling conduction between the first connector 11 and the second connector 12 of the same connector 10.

[0058] As shown in FIG1, the energy storage system 100 according to an embodiment of this application includes: the energy storage device 1 of the above embodiments, as shown in FIG7.

[0059] It should be noted that, as shown in Figure 1, the energy storage system 100 can be composed of a second battery box 3 at the bottom and a first battery box 2 located above the second battery box 3 stacked together. The number of first battery boxes 2 can be one or more, and the multiple first battery boxes 2 are stacked together.

[0060] For example, as shown in Figure 1, there is a second battery box 3 and two first battery boxes 2. When the lower second battery box 3 is stacked with the first battery box 2, the first connector 11 of the lower second battery box 3 will connect with the second connector 12 of the first battery box 2. At the same time, the second signal line 90 of the first battery box 2 will connect with the first signal line 60 of the lower second battery box 3. After the first battery box 2 and the lower second battery box 3 are installed, another first battery box 2 is installed on top of the lower first battery box 2. Similarly, during the installation process, the second connector 12 of the upper first battery box 2 will connect with the first connector 11 of the lower first battery box 2, and the first signal line 60 of the upper first battery box 2 will connect with the second signal line 90 of the lower first battery box 2. In this way, the three battery boxes can be connected in series. In addition, the status information of the first battery pack 70 and the second battery pack 150 can be transmitted to an external controller through the first connector 11 of the upper first battery box 2.

[0061] It should be noted that the ends of the first grounding components 21 and 22 on the two first battery boxes 2 that connect to the first housing 30 are both connected to the lower side of the corresponding first housing 30, and the second battery box 3 can be directly grounded to the ground. Thus, when either of the two first battery boxes 2 experiences leakage, the leakage current can be transmitted to the second battery box 3 through the corresponding first housing 30 and grounding component 20, thereby achieving grounding and protecting the energy storage system 100. Furthermore, during the assembly of the energy storage system 100, the sides of the two first battery boxes 2 and the second battery box 3, i.e., the parts not grounded by the corresponding grounding component 20, can come into contact with each other, allowing the leakage current to be transmitted to the second battery box 3, thereby achieving grounding of the sides of the first battery boxes 2 and further improving safety.

[0062] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0063] In the description of this application, "feature" or "second feature" may include one or more of the features. In the description of this application, "multiple" means two or more. In the description of this application, "above" or "below" the second feature may include direct contact with the second feature, or it may include contact with the second feature through another feature between them. In the description of this application, "above," "over," and "on top" of the second feature includes the feature being directly above or diagonally above the second feature, or simply indicates that the feature is at a higher horizontal level than the second feature.

[0064] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0065] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. An energy storage device (1) characterized in that, Comprising: a first battery box (2) including a first battery pack (70); a second battery box (3) disposed in stack with the first battery box (2), the second battery box (3) including a second battery pack (150); and a connector (10) including a first connector (11) and a second connector (12), the first connector (11) being provided on both the first battery box (2) and the second battery box (3), the second connector (12) being further provided on the first battery box (2); one end of the first connector (11) of the first battery box (2) is adapted to be electrically connected to other devices, the other end of the first connector (11) of the first battery box (2) is electrically connected to one of the positive and negative poles of the first battery pack (70); the other of the positive and negative poles of the first battery pack (70) is electrically connected to one end of the second connector (12) of the first battery box (2); the other end of the second connector (12) of the first battery box (2) is electrically connected to one end of the first connector (11) of the second battery box (3); the other end of the first connector (11) of the second battery box (3) is electrically connected to the positive and negative poles of the second battery pack (150).

2. The energy storage device (1) according to claim 1, characterized in that Further comprising an electric connection wire (4) including a positive connection wire (80) and a negative connection wire (100), wherein, in the first battery box (2), one end of the positive connection wire (80) and the negative connection wire (100) is electrically connected to the first connector (11), the other end of the one of the positive connection wire (80) and the negative connection wire (100) is electrically connected to the first battery pack (70), one end of the other of the positive connection wire (80) and the negative connection wire (100) is electrically connected to the first battery pack (70), and the other end of the other of the positive connection wire (80) and the negative connection wire (100) is electrically connected to the second connector (12); and / or in the second battery box (3), one end of the positive connection wire (80) and one end of the negative connection wire (100) are electrically connected to the first connector (11), and the other end of the positive connection wire (80) and the other end of the negative connection wire (100) are electrically connected to the second battery pack (150).

3. Energy storage device (1) according to claim 1 or 2, characterized in that The first connector (11) is provided with a first plug portion, the second connector (12) is provided with a second plug portion, and the first plug portion is plugged with the second plug portion to be electrically connected.

4. The energy storage device (1) according to any one of claims 1 to 3, characterized in that The first battery box (2) further includes a first housing (30), and the first battery pack (70) is disposed in the first housing (30), the second battery box (3) further includes a second housing (140), and the second battery pack (150) is disposed in the second housing (140), In the first battery box (2), the first connector (11) is arranged on a side of the first housing (30) away from the second housing (140), and the second connector (12) is arranged on a side of the first housing (30) adjacent to the second housing (140). In the second battery box (3), the first connector (11) is arranged on a side of the second housing (140) adjacent to the first housing (30).

5. The energy storage device (1) according to claim 4, characterized in that Further comprising a grounding member (20), the grounding member (20) comprises a first grounding member (21), In the first battery box (2), the first grounding member (21) is connected between the first connector (11) and the first housing (30), In the second battery box (3), the first grounding member (21) is connected between the first connector (11) and the second housing (140).

6. The energy storage device (1) according to claim 4, characterized in that Further comprising a grounding member (20), the grounding member (20) comprises a first grounding member (21) and a second grounding member (22), the second grounding member (22) connects the second connector (12) and the first grounding member (21).

7. The energy storage device (1) according to claim 6, characterized in that The first connector (11) or the second connector (12) is provided with a fitting portion (111), and the first grounding member (21) is fitted in the fitting portion (111).

8. The energy storage device (1) according to claim 7, characterized in that Further comprising a ground wire structure (120), the ground wire structure (120) is arranged on the first connector (11) or the second connector (12), and the first grounding member (21) is connected with the ground wire structure (120) through the fitting portion (111).

9. The energy storage device (1) according to any one of claims 5-8, characterized in that Further comprising a first mounting bracket (40) and a second mounting bracket (130), the first mounting bracket (40) is connected on the first housing (30) and the second housing (140), and the second mounting bracket (130) is further connected on the first housing (30), the first connector (11) is arranged on the first mounting bracket (40), the first grounding member (21) is connected with the first mounting bracket (40), and the second connector (12) is arranged on the second mounting bracket (130).

10. The energy storage device (1) according to claim 9, characterized in that The first mounting bracket (40) comprises a main body portion (41) and two mounting legs (42), the first connector (11) is arranged on the main body portion (41), the two mounting legs (42) are connected on two ends of the main body portion (41), the two mounting legs (42) are respectively connected on the first housing (30), and the two mounting legs (42) are respectively connected on the second housing (140).

11. The energy storage device (1) according to any one of claims 4-10, characterized in that Further comprising a first signal line (60) and a second signal line (90), The first battery box (2) further includes a first circuit board (50), which is disposed on the first housing (30). In the first battery box (2), the first signal line (60) is connected between the first connector (11) and the first circuit board (50), and the second signal line (90) is connected between the second connector (12) and the first circuit board (50), and / or The second battery box (3) also includes a second circuit board (160), which is disposed on the second housing (140). In the second battery box (3), the first signal line (60) is connected between the first connector (11) and the second circuit board (160).

12. The energy storage device (1) according to any one of claims 1-11, characterized in that It also includes a power line (110), which is electrically connected between the first connector (11) and the second connector (12) in the first battery box (2).

13. An energy storage system (100), characterized by include: The energy storage device (1) according to any one of claims 1-12, wherein there are multiple first battery boxes (2), and the multiple first battery boxes (2) are stacked together.

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