Energy storage equipment

Abstract

The utility model relates to the technical field of energy storage, and discloses an energy storage device which at least can supply power to a first electric device and a second electric device, the energy storage device comprises a first battery pack and a second battery pack which are used for storing electric energy, and a positive terminal and a negative terminal are respectively led out from the first battery pack and the second battery pack; the first discharge interface is used for supplying power to first electric equipment; the second discharge interface is used for supplying power to second electric equipment; when the energy storage equipment does not supply power to the second electric equipment, the two battery packs output first voltage to the outside; when the energy storage equipment supplies power to the second electric equipment, the two battery packs output a second voltage by adjusting the positions of the positive and negative terminals; wherein the second voltage is greater than the first voltage. The two ends of the battery pack can output two different voltages to the outside, power supply requirements of high-power electric equipment can be met, and meanwhile the service life of the battery pack can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage, in particular to an energy storage device. Background Art

[0002] Current energy storage devices generally have a large built-in battery pack, which has a positive terminal and a negative terminal to output the total voltage. The battery pack is composed of multiple single cells, and its theoretical maximum voltage output is the total voltage of all the single cells connected in series. However, as the number of single cells in series increases, the inconsistency of parameters such as voltage, capacity, internal resistance, life, and self-discharge rate formed in the design and process production of the cells will cause the battery pack to have a "short board effect", that is, the inconsistency of the single cells will cause the battery pack to have problems such as rapid capacity decay, short life, and increased internal resistance during use.

[0003] In order to alleviate the "short board effect" of the battery pack, the power battery pack will reasonably combine multiple series and multiple parallels of single cells according to the use conditions of the electrical equipment before forming the group. For example, 6 series and 8 parallels represent 6 single cells connected in series to form a group of battery units, and then 8 groups of battery units are connected in parallel to form the final battery pack. Then, the voltage output at both ends of the battery pack depends on the number of single cells connected in series in a group of battery units. Although the "short board effect" of the battery pack is alleviated, it also leads to a small total output voltage at both ends of the battery pack, making the energy storage device unable to be used for powering high-power electrical equipment (energy storage devices on low-voltage platforms are forced to be used for powering high-power electrical equipment. Huge current will be generated, which will cause the battery pack to overheat and damage various components on the energy storage device and electrical equipment).

[0004] Therefore, there is an urgent need to develop a new energy storage device that can match the power supply needs of high-power electrical equipment while ensuring its own service life. Utility Model Content

[0005] The purpose of the utility model is to provide an energy storage device. The two ends of the battery pack of the utility model can output two different voltages to the outside, which can match the power supply requirements of high-power electrical equipment and ensure its own service life.

[0006] Technical solution of the utility model: The utility model provides an energy storage device, which can at least supply power to a first power-consuming device and a second power-consuming device, and the energy storage device includes:

[0007] A first battery group and a second battery group are used to store electric energy, and the first battery group and the second battery group are respectively connected to a positive terminal and a negative terminal;

[0008] A first discharge interface, used to supply power to the first electrical device;

[0009] A second discharge interface, used to supply power to the second electrical device;

[0010] When the energy storage device does not supply power to the second electrical device, the first battery group and the second battery group are connected in parallel and output a first voltage to the outside;

[0011] When the energy storage device supplies power to the second electrical device, the first battery group and the second battery group are changed from a parallel connection state to a series connection state by adjusting the positions of the positive and negative terminals, and output a second voltage to the outside;

[0012] The second voltage is greater than the first voltage.

[0013] Compared with the prior art, the beneficial effects of the energy storage device of the utility model are embodied in the following aspects: two independent battery packs are arranged inside the utility model, and the two battery packs are respectively provided with positive and negative terminals. The two battery packs can be switched between series and parallel states by adjusting the positions of the positive and negative terminals, which makes the two battery packs as a combination, and their two ends can directly output two different voltages. When the two battery packs are kept in parallel state, they directly output a lower first voltage to the outside, which can meet the use requirements of most low-power electrical equipment, and at the same time can alleviate the "short board effect" of the battery pack and ensure the service life of the battery pack itself; when the two battery packs are switched to a series state, they directly output a higher second voltage to the outside, which can match the use requirements of high-power electrical equipment.

[0014] In summary, the two battery packs are connected in series only when high-power electrical equipment needs power supply. In most other usage scenarios, the two battery packs are connected in parallel. This allows the utility model to meet the usage requirements of electrical equipment with different power levels while effectively ensuring the service life of the energy storage device itself.

[0015] The aforementioned energy storage device further includes an inverter module. When the energy storage device supplies power to the first electrical device, the direct current output by the first battery group and the second battery group is converted into alternating current by the inverter module and then output from the first discharge interface.

[0016] In the aforementioned energy storage device, when the energy storage device supplies power to the second electrical device, the direct current output by the first battery pack and the second battery pack is directly output from the second discharge interface.

[0017] The aforementioned energy storage device further includes a main control board and a third discharge interface, wherein the main control board is used to control the first battery group and the second battery group, and the third discharge interface is connected to the main control board for outputting direct current.

[0018] In the aforementioned energy storage device, the first battery pack and the second battery pack are respectively connected to a BMS board, and the two BMS boards are respectively connected to the main control board.

[0019] In the aforementioned energy storage device, each of the first battery group and the second battery group includes a plurality of single battery cells arranged in parallel, and the first battery group and the second battery group are arranged closely along the axial direction of the single battery cells.

[0020] In the aforementioned energy storage device, the first battery group leads to a first positive terminal and a first negative terminal respectively, and the second battery group leads to a second positive terminal and a second negative terminal respectively;

[0021] When the energy storage device does not supply power to the second electrical device, the first positive terminal is conductively connected to the second positive terminal, and the first negative terminal is conductively connected to the second negative terminal;

[0022] When the energy storage device supplies power to the second electrical device, the first negative terminal is conductively connected to the second positive terminal, the first positive terminal is conductively connected to the positive input terminal of the second electrical device, and the second negative terminal is conductively connected to the negative input terminal of the second electrical device.

[0023] The aforementioned energy storage device also includes a shell, the second discharge interface is located on the outer side of the shell, the first positive terminal, the first negative terminal, the second positive terminal and the second negative terminal are all located inside the shell, and all terminals are gathered at a position close to the second discharge interface.

[0024] In the aforementioned energy storage device, the first battery pack and the second battery pack are fixedly connected in a non-conductive manner, and the first battery pack and the second battery pack are both fixedly connected to the shell.

[0025] In the aforementioned energy storage device, the rated power of the second electrical device is greater than 1000W. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the external structure of the energy storage device of the utility model;

[0027] Figure 2 It is a schematic diagram of the internal structure of the energy storage device of the utility model;

[0028] Figure 3 is a schematic diagram of the arrangement of the first battery group and the second battery group;

[0029] Figure 4 is a schematic diagram of the status of each terminal when the second electrical device is not connected to the second discharge interface;

[0030] Figure 5 It is a schematic diagram of the status of each terminal when the second electrical equipment is connected to the second discharge interface.

[0031] Figure symbols: B1, first battery group; B2, second battery group; B1+, first positive terminal; B1-, first negative terminal; B2+, second positive terminal; B2-, second negative terminal; 1, first discharge interface; 2, second discharge interface; 3, inverter module; 4, main control board; 5, third discharge interface; 6, BMS board; 7, single cell; 8, shell; 9, charging interface; 10, battery pack; 11, battery compartment; 12, base; 13, non-conductive slidable component; 14, spring; 15, short-circuit plug; 16, plug connector; 17, non-conductive push rod; B+, positive plug; B-, negative plug. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0033] The utility model provides an energy storage device, the structure of which is as follows Figures 1 to 3 As shown, at least the first power-consuming device and the second power-consuming device can be powered, and the energy storage device includes:

[0034] The first battery group B1 and the second battery group B2 are used to store electric energy. The first battery group B1 and the second battery group B2 are respectively connected to a positive terminal and a negative terminal.

[0035] A first discharge interface 1, used to supply power to a first electrical device;

[0036] A second discharge interface 2, used to supply power to a second electrical device;

[0037] When the energy storage device does not supply power to the second electrical device, the first battery pack B1 and the second battery pack B2 are connected in parallel and output the first voltage to the outside;

[0038] When the energy storage device supplies power to the second electrical device, the first battery group B1 and the second battery group B2 are changed from a parallel connection state to a series connection state by adjusting the positions of the positive and negative terminals, and output a second voltage to the outside;

[0039] The second voltage is greater than the first voltage.

[0040] In this embodiment, two independent battery packs are arranged inside the energy storage device. The two battery packs are respectively connected with positive and negative terminals. The two battery packs can be switched between series and parallel states by adjusting the positions of the positive and negative terminals. This makes the two battery packs as a combination, and their two ends can directly output two different voltages. When the two battery packs are kept in parallel, they directly output a lower first voltage to the outside, which can meet the use requirements of most low-power electrical equipment, and at the same time can alleviate the "short board effect" of the battery pack and ensure the service life of the battery pack itself; when the two battery packs are switched to a series state, they directly output a higher second voltage to the outside, which can match the use requirements of high-power electrical equipment.

[0041] In summary, the two battery packs are connected in series only when high-power electrical equipment needs power supply. In most other usage scenarios, the two battery packs are connected in parallel. This allows the utility model to meet the usage requirements of electrical equipment with different power levels while effectively ensuring the service life of the energy storage device itself.

[0042] In this embodiment, considering the safety of the energy storage device, the first discharge interface 1 and the second discharge interface 2 cannot be used at the same time.

[0043] In this embodiment, the energy storage device includes a charging interface 9 for charging the first battery pack B1 and the second battery pack B2.

[0044] Optionally, a battery pack 10 is wirelessly connected to the energy storage device, and the battery pack 10 can draw power from the first battery group B1 and the second battery group B2. When the battery pack 10 is removed from the energy storage device, the battery pack 10 can supply power to other adaptable electrical devices, expanding the use scenarios of the utility model.

[0045] In this embodiment, the energy storage device is provided with a battery compartment 11 for accommodating the battery pack 10 . When the battery pack 10 is inserted into the battery compartment 11 , the first battery group B1 and the second battery group B2 can charge the battery pack 10 .

[0046] Optionally, the energy storage device further includes an inverter module 3 . When the energy storage device supplies power to the first electrical device, the direct current output by the first battery pack B1 and the second battery pack B2 is converted into alternating current by the inverter module 3 and then output from the first discharge interface 1 .

[0047] In this embodiment, the first discharge interface 1 as an AC power output port can be adapted to common outdoor small appliances on the market that require AC power supply, such as kettles, rice cookers, electric fans and other small appliances that may be used when camping outdoors.

[0048] Optionally, when the energy storage device supplies power to the second electrical device, the direct current output by the first battery pack B1 and the second battery pack B2 is directly output from the second discharge interface 2 .

[0049] In this embodiment, the second electrical equipment is a high-power electrical appliance powered by DC and its rated power is generally greater than 1000W, such as large garden equipment such as snow blowers and lawn mowers. At this time, the first battery pack B1 and the second battery pack B2 are connected in series to output a higher second voltage to the outside, so that the current output at both ends of the battery pack can be maintained at a lower value, thereby reducing the heat generated by the battery pack and increasing the service life of the energy storage device.

[0050] Optionally, the energy storage device further includes a main control board 4 and a third discharge interface 5, the main control board 4 is used to control the first battery group B1 and the second battery group B2, and the third discharge interface 5 is connected to the main control board 4 for outputting direct current.

[0051] In this embodiment, the third discharge interface 5 does not directly output the DC power across the first battery pack B1 and the second battery pack B2, but outputs the DC power after being regulated by the main control board 4. Therefore, the third discharge interface 5 is generally connected to a DC power-consuming device with lower power. The third discharge interface 5 can be in various forms, such as a USB-C interface, a USB-A interface, etc.

[0052] Optionally, the first battery pack B1 and the second battery pack B2 are respectively connected to a BMS board 6 , and the two BMS boards 6 are respectively connected to the main control board 4 .

[0053] In this embodiment, the two BMS boards 6 are respectively used to monitor the voltage, current, temperature and other parameters of the corresponding battery packs, grasp the status of the battery packs in real time, and control the charging and discharging process of the battery packs to avoid overcharging or over-discharging and protect the battery packs from damage; the first battery pack B1 and the second battery pack B2 are respectively monitored by one BMS board 6, which can effectively ensure the service life of the first battery pack B1 and the second battery pack B2.

[0054] Optionally, the first battery pack B1 and the second battery pack B2 each include a plurality of single battery cells 7 arranged in parallel, and the first battery pack B1 and the second battery pack B2 are arranged closely along the axial direction of the single battery cells 7 .

[0055] In this embodiment, the first battery pack B1 and the second battery pack B2 are both composed of a plurality of single cells 7 in series and in parallel. The two battery packs are arranged adjacent to each other in the axial direction of the single cells 7, which can effectively save space inside the energy storage device and has high space utilization.

[0056] Optionally, the first battery group B1 is provided with a first positive terminal B1+ and a first negative terminal B1-, and the second battery group B2 is provided with a second positive terminal B2+ and a second negative terminal B2-;

[0057] When the energy storage device does not supply power to the second electrical device, the first positive terminal B1+ is conductively connected to the second positive terminal B2+, and the first negative terminal B1- is conductively connected to the second negative terminal B2-;

[0058] When the energy storage device supplies power to the second electrical device, the first negative terminal B1- is conductively connected to the second positive terminal B2+, the first positive terminal B1+ is conductively connected to the positive input terminal of the second electrical device, and the second negative terminal B2- is conductively connected to the negative input terminal of the second electrical device.

[0059] In this embodiment, only when the second electrical device is connected to the second discharge interface 2, the first battery group B1 and the second battery group B2 will be changed from a parallel state to a series state by adjusting the positions of the positive and negative terminals, and will always remain in the series state during the power consumption of the second electrical device. When the second discharge interface 2 is not connected to the electrical device, the first battery group B1 and the second battery group B2 are always in a parallel state.

[0060] Optionally, the energy storage device also includes a shell 8, the second discharge interface 2 is located on the outer side of the shell 8, the first positive terminal B1+, the first negative terminal B1-, the second positive terminal B2+ and the second negative terminal B2- are all located inside the shell 8, and all terminals are gathered at a position close to the second discharge interface 2.

[0061] In this embodiment, the first positive terminal B1+, the first negative terminal B1-, the second positive terminal B2+ and the second negative terminal B2- are all led out from the corresponding battery pack and converged to a position close to the second discharge port 2 through the connection of wires.

[0062] The clustered arrangement of all terminal positions is arranged for switching between the series-parallel state of the first battery group B1 and the second battery group B2. There are many mechanical structures that can realize the conversion of the first battery group B1 and the second battery group B2 from the parallel state to the series state by adjusting the positions of the positive and negative terminals. In this embodiment, only one mechanical adjustment structure is listed. The mechanical adjustment structure is located inside the shell 8, close to the second discharge interface 2, and includes a base 12 for placing the first positive terminal B1+, the first negative terminal B1-, the second positive terminal B2+, and the second negative terminal B2-, wherein the first positive terminal B1+ and the second positive terminal B2+ are arranged along a first direction, and the first negative terminal B1- and the second negative terminal B2- are arranged along a second direction. The first direction and the second direction are parallel, the second positive terminal B2+ and the first negative terminal B1- are fixed together by a non-conductive sliding component 13, the non-conductive sliding component 13 can slide along the first direction under the action of external force, and can drive the second positive terminal B2+ and the first negative terminal B1- to move synchronously, a spring 14 and a short-circuit plug 15 are provided on the inner side of the non-conductive sliding component 13, the spring 14 is connected to the non-conductive sliding component 13, when the non-conductive sliding component 13 moves to the side where the short-circuit plug 15 is located, the spring 14 gives the non-conductive sliding component 13 an elastic force in the opposite direction, and the short-circuit plug 15 short-circuits the second positive terminal B2+ and the first negative terminal B1- after the non-conductive sliding component 13 moves to a certain extent.

[0063] refer to Figure 4 , this is the state when the second electrical device is not connected to the second discharge interface 2. It can be seen that the first positive terminal B1+ is conductively connected to the second positive terminal B2+, the first negative terminal B1- is conductively connected to the second negative terminal B2-, the first battery pack B1 and the second battery pack B2 are in parallel, the spring 14 is in a natural state, and the short-circuit plug 15 is not connected to any terminal;

[0064] refer to Figure 5, this is the state when the second electrical device is about to be connected to the second discharge interface 2, wherein the second electrical device includes a plug connector 16 that is plugged into the second discharge interface 2, and the plug connector 16 includes a positive plug piece B+, a negative plug piece and a non-conductive push rod 17. When the plug connector 16 is inserted into the second discharge interface 2, the positive plug piece B+ is conductively connected to the first positive terminal B1+, and the negative plug piece is conductively connected to the second negative terminal B2-. The non-conductive push rod 17 pushes the non-conductive slidable component 13 to move toward the side where the short-circuit plug piece 15 is located. As the plug connector 16 of the second electrical device is inserted, the first A positive terminal B1+ is disconnected from a second positive terminal B2+, and a first negative terminal B1- is disconnected from a second negative terminal B2-. Under the connecting action of the short-circuit plug 15, the second positive terminal B2+ is short-circuited with the first negative terminal B1-. At this time, the first battery pack B1 and the second battery pack B2 are changed from a parallel state to a series state, and the spring 14 is compressed; when the plug connector 16 of the second electrical equipment is pulled out, under the action of the spring 14, the non-conductive sliding component 13 returns to its initial position, and the first battery pack B1 and the second battery pack B2 are changed into a parallel state again.

[0065] Optionally, the first battery pack B1 and the second battery pack B2 are fixedly connected in a non-conductive manner, and both the first battery pack B1 and the second battery pack B2 are fixedly connected to the housing 8 .

[0066] In this embodiment, the first battery pack B1 and the second battery pack B2 are highly integrated after being connected, and are convenient to be installed inside the housing 8 . At the same time, they can effectively save space inside the energy storage device, and have high space utilization.

[0067] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0068] The above are only preferred implementations of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims

1. An energy storage device, which can supply power to at least a first power-consuming device and a second power-consuming device, characterized in that: The energy storage device comprises: A first battery group and a second battery group are used to store electric energy, and the first battery group and the second battery group are respectively connected to a positive terminal and a negative terminal; A first discharge interface, used to supply power to the first electrical device; A second discharge interface, used to supply power to the second electrical device; When the energy storage device does not supply power to the second electrical device, the first battery group and the second battery group are connected in parallel and output a first voltage to the outside; When the energy storage device supplies power to the second electrical device, the first battery group and the second battery group are changed from a parallel connection state to a series connection state by adjusting the positions of the positive and negative terminals, and output a second voltage to the outside; The second voltage is greater than the first voltage.

2. The energy storage device according to claim 1, characterized in that: It also includes an inverter module. When the energy storage device supplies power to the first power-consuming device, the direct current output by the first battery group and the second battery group is converted into alternating current by the inverter module and then output from the first discharge interface.

3. The energy storage device according to claim 1, characterized in that: When the energy storage device supplies power to the second electrical device, the direct current output by the first battery pack and the second battery pack is directly output from the second discharge interface.

4. The energy storage device according to claim 1, characterized in that: It also includes a main control board and a third discharge interface, the main control board is used to manage the first battery group and the second battery group, and the third discharge interface is connected to the main control board for outputting direct current.

5. The energy storage device according to claim 4, characterized in that: The first battery pack and the second battery pack are respectively connected to a BMS board, and the two BMS boards are respectively connected to the main control board.

6. The energy storage device according to claim 1, characterized in that: The first battery group and the second battery group each include a plurality of single battery cells arranged in parallel, and the first battery group and the second battery group are closely arranged along the axial direction of the single battery cells.

7. The energy storage device according to any one of claims 1 to 6, characterized in that: The first battery group is provided with a first positive terminal and a first negative terminal, respectively, and the second battery group is provided with a second positive terminal and a second negative terminal, respectively; When the energy storage device does not supply power to the second electrical device, the first positive terminal is conductively connected to the second positive terminal, and the first negative terminal is conductively connected to the second negative terminal; When the energy storage device supplies power to the second electrical device, the first negative terminal is conductively connected to the second positive terminal, the first positive terminal is conductively connected to the positive input terminal of the second electrical device, and the second negative terminal is conductively connected to the negative input terminal of the second electrical device.

8. The energy storage device according to claim 7, characterized in that: It also includes a shell, the second discharge interface is located on the outer side of the shell, the first positive terminal, the first negative terminal, the second positive terminal and the second negative terminal are all located inside the shell, and all terminals are gathered at a position close to the second discharge interface.

9. The energy storage device according to claim 8, characterized in that: The first battery pack and the second battery pack are fixedly connected in a non-conductive manner, and both the first battery pack and the second battery pack are fixedly connected to the shell.

10. The energy storage device according to any one of claims 1 to 6, characterized in that: The rated power of the second electrical equipment is greater than 1000W.

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