Energy storage equipment

Abstract

Energy storage equipment comprises a cabinet body and a plurality of energy storage units arranged in the cabinet body in parallel, and each energy storage unit comprises a battery module, an energy storage converter electrically connected with the battery module and a battery management system for detecting working parameters of the battery module. Each energy storage unit of the energy storage equipment can control the corresponding battery module to be charged or discharged according to the working parameters or actual use requirements of the corresponding battery module, so that the accurate and fine control management of the operation of each battery module is realized, the energy storage equipment can be controlled to store and supply electric energy with different capacities, and the energy storage efficiency is improved. The energy storage equipment can be used in various scenes with different capacity electric energy use requirements, and the adaptability of the energy storage equipment is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of power electronics, in particular to a kind of energy storage equipment. BACKGROUND

[0002] Energy storage equipment is used to store electrical energy and release electrical energy when needed. Current energy storage equipment mainly includes multiple battery modules, an energy storage converter and a battery management system. The multiple battery modules are connected in series to the energy storage converter, and the battery management system simultaneously detects the current, voltage and temperature parameters of the multiple battery modules.

[0003] Since the existing energy storage equipment connects multiple battery modules in series to an energy storage converter, all battery modules operate simultaneously during operation, and all battery modules stop operating simultaneously when stopping operation. It is unable to control the working state of a single battery module and achieve precise and fine control management of battery module operation. When one of the battery modules fails, the entire energy storage equipment needs to stop operation, affecting production and life. The energy storage equipment has low equipment utilization, poor reliability and low return on investment.

[0004] Therefore, there is an urgent need to provide an energy storage equipment that can be precisely and finely controlled and has good reliability. SUMMARY

[0005] The utility model aims to avoid the shortcomings of the prior art and provide an energy storage equipment that can be precisely and finely controlled and has good reliability, to solve the above technical problems.

[0006] An energy storage equipment includes a cabinet body, multiple energy storage units arranged in parallel in the cabinet body, each energy storage unit includes a battery module, an energy storage converter electrically connected to the battery module, and a battery management system for detecting the working parameters of the battery module.

[0007] Preferably, the energy storage converter and the battery management system in each energy storage unit are combined to form a fusion energy storage converter.

[0008] Preferably, each fusion energy storage converter further includes a DC conversion module electrically connected to the battery module and the energy storage converter in the energy storage unit.

[0009] Preferably, the capacities of the battery modules are different.

[0010] Preferably, the energy storage units are arranged in layers in the cabinet body.

[0011] Preferably, the lower part of the energy storage unit in the cabinet body further includes an AC bus box for external wiring, and the AC bus box is electrically connected to each energy storage unit.

[0012] Preferably, a heat dissipation pipeline is arranged in the cabinet, and a liquid cooling machine is arranged on the left side of the cabinet and communicated with the heat dissipation pipeline.

[0013] Preferably, a power distribution device is further arranged at the lower part of the liquid cooling machine, and the power distribution device comprises a step-down transformer connected with the AC bus box, and the step-down transformer supplies power to the liquid cooling machine.

[0014] Preferably, the power distribution device further comprises a controller for controlling the operation of the energy storage units, and the step-down transformer supplies power to the controller.

[0015] Preferably, the power distribution device further comprises a switch for interacting with external control information and sending control information to the controller, and the step-down transformer supplies power to the switch.

[0016] Compared with the prior art, the utility model has the following advantages: the plurality of energy storage units of the energy storage device are arranged in parallel, each energy storage unit comprises a battery module, an energy storage converter electrically connected with the battery module and a battery management system for detecting the working parameters of the battery module, that is, one battery module is electrically connected with one energy storage converter in one-to-one correspondence, the plurality of energy storage units are connected with the power grid in parallel after being connected, one battery management system detects the working parameters of one battery module in one-to-one correspondence, and the specific working parameters can be voltage, current, temperature and power of the battery module and the like.

[0017] When charging, external AC power enters the corresponding energy storage converter of each energy storage unit, and each energy storage converter converts AC power into DC power and then outputs the DC power to the corresponding battery module for charging; when discharging, each battery module outputs DC power to the corresponding energy storage converter, and each energy storage converter converts the DC power into AC power and then connects with the power grid in parallel for power supply.

[0018] The energy storage unit of this invention can control whether its corresponding battery module is charged or discharged based on the operating parameters or actual usage requirements of that battery module. This achieves precise and refined control and management of the operation of each battery module, enabling the energy storage device to store and supply different capacities of electrical energy. This meets the needs of various scenarios requiring different capacities of electrical energy, improving the adaptability of the energy storage device. When one battery module or energy storage converter fails, i.e., when one energy storage unit fails, it is not necessary to stop the operation of the entire energy storage device as in existing technologies. Only the operation of the failed energy storage unit needs to be stopped, while other normal energy storage units continue to charge or supply power and operate normally, without affecting production and daily life. Therefore, the energy storage device of this invention improves equipment utilization, has high reliability, and a high return on investment. Furthermore, it allows for the repair of failed battery modules or energy storage converters without affecting the normal operation of the energy storage device, making maintenance very convenient. Attached Figure Description

[0019] The present invention will be further described with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the present invention.

[0020] Figure 1 This is a structural schematic diagram of an energy storage device according to the present invention;

[0021] Figure 2 This is a schematic diagram of the electrical connection structure of an energy storage device according to this utility model;

[0022] Figure 3 This is a schematic diagram of the structure of an energy storage unit of an energy storage device according to this utility model;

[0023] Figure 4 This is a schematic diagram of the structure of an energy storage unit of an energy storage device according to this utility model. Detailed Implementation

[0024] The present invention will be further described in conjunction with the following embodiments and accompanying drawings:

[0025] An energy storage device, such as Figures 1 to 4 As shown, it includes: a cabinet 10, multiple energy storage units 11 arranged in parallel within the cabinet 10, each energy storage unit 11 including a battery module 12, an energy storage inverter 13 electrically connected to the battery module 12, and a battery management system 14 for detecting the operating parameters of the battery module 12.

[0026] The battery module 12 is a battery system combined by a plurality of battery monomers in the prior art. The energy storage converter 13, also known as a bidirectional energy storage inverter, can realize power conversion from direct current to alternating current or from alternating current to direct current, and is a device connecting between a battery pack and a power grid (or a load) in the prior art. The battery management system 14 is an electronic control unit for monitoring and managing the battery module 12 in the prior art, which can detect the voltage, current and temperature of the battery module 12 in real time, ensure that they operate within a safe operating range, and control the charging and discharging of the battery module 12 according to the state of charge of the battery module 12 to prevent overcharging or overdischarging.

[0027] The plurality of energy storage units 11 of the energy storage device are connected in parallel, each energy storage unit 11 includes a battery module 12, an energy storage converter 13 electrically connected with the battery module 12, and a battery management system 14 for detecting the working parameters of the battery module 12, that is, one battery module 12 is electrically connected with one energy storage converter 13 in a one-to-one correspondence, the plurality of energy storage units 11 are connected in parallel and then connected to the power grid, and one battery management system 14 detects the working parameters of one battery module 12 in a one-to-one correspondence, and the specific working parameters can be parameters such as the voltage, current, temperature and power of the battery module 12.

[0028] During charging, external alternating current enters the corresponding energy storage converter 13 of each energy storage unit 11, and each energy storage converter 13 converts the alternating current into direct current and then outputs the direct current to the corresponding battery module 12 for charging. During discharging, each battery module 12 outputs direct current to the corresponding energy storage converter 13, and each energy storage converter 13 converts the direct current into alternating current and then connects in parallel to the power grid for power supply.

[0029] The energy storage units 11 of the energy storage device can control whether the corresponding battery module 12 is charged or discharged according to the working parameters of the corresponding battery module 12 or actual use requirements, precise and fine control and management of the operation of each battery module 12 are realized, the energy storage device can store and supply different capacities of electric energy, the adaptability of the energy storage device is improved, and the energy storage device meets the use requirements of the energy storage device in various different capacity electric energy use scenarios. When one of the battery modules 12 or the energy storage converters 13 fails, that is, when one of the energy storage units 11 fails, the operation of the entire energy storage device does not need to be stopped as in the prior art, only the operation of the faulty energy storage unit 11 needs to be stopped, and the other normal energy storage units 11 continue to be charged or powered normally and operate normally, which will not affect production and life, so that the energy storage device improves the utilization rate of the device, has high reliability, high investment and high return on investment, and the faulty battery module 12 or the faulty energy storage converter 13 can be repaired without affecting the normal operation of the energy storage device, and the repair and maintenance are very convenient.

[0030] Preferably, as Figures 2 to 4As shown, the energy storage converter 13 and the battery management system 14 in each energy storage unit 11 are combined to form a fusion energy storage converter 15. The fusion energy storage converter 15 integrates the energy storage converter 13 and other system components. The energy storage device of the utility model is combined to form a fusion energy storage converter 15 by the energy storage converter 13 and the battery management system 14. The fusion energy storage converter 15 integrates the functions of the energy storage converter 13 and the battery management system 14, has high integration, compact device structure and high device efficiency.

[0031] Preferably, as shown in the drawings, Figure 4 As shown, a DC conversion module 16 is further arranged in each fusion energy storage converter 15, and the DC conversion module 16 is electrically connected to the battery module 12 and the energy storage converter 13 in the energy storage unit 11. Since the voltage output by a single battery module 12 is low, it is not conducive to the power conversion of the energy storage converter 13 to the direct current output by the single battery module 12. Therefore, the DC conversion module 16 is arranged between the battery module 12 and the energy storage converter 13. The direct current output by the battery module 12 is first boosted by the DC conversion module 16 and then converted into alternating current by the energy storage converter 13. This facilitates the conversion of the direct current of the battery module 12 into alternating current by the energy storage converter 13, and the voltage range of the single battery module 12 is wider.

[0032] Specifically, each battery module 12 can be set to different capacities as needed to meet the use requirements of different capacity electric energy of the energy storage device. Since each battery module 12 is connected to one energy storage unit 11 one by one, and each energy storage unit 11 is connected in parallel to the power grid, each battery module 12 can be set to different capacities as needed. When different capacity battery modules 12 are connected to the power grid at the same time, whether the battery module 12 needs to be charged or discharged can be controlled according to the real-time electric energy of the battery module 12 detected by the battery management system 14. For example, when the small capacity battery module 12 is fully charged, the charging of the battery module 12 can be stopped by the corresponding energy storage converter 13. In this way, the safety hazard of the fully charged battery module 12 due to continuous charging can be avoided.

[0033] Preferably, as shown in the drawings, Figure 1 As shown, each energy storage unit 11 is arranged in the cabinet 10 in a stacked manner. The stacked arrangement of each energy storage unit 11 in the cabinet 10 facilitates the unified wiring of the energy storage unit 11, and is convenient for installation and maintenance. The modular arrangement has a compact structure and a small volume of the energy storage device.

[0034] Preferably, as shown in the drawings, Figure 1 and Figure 2As shown, the lower part of the energy storage unit 11 in the cabinet 10 is also provided with an external wiring AC bus 17, and the AC bus 17 is electrically connected with each energy storage unit 11. The AC bus 17 is arranged at the lower part of the energy storage unit 11 in the cabinet 10, and each energy storage unit 11 is connected to the AC bus 17, which is convenient for wiring. Moreover, the AC bus 17 is arranged at the lower end of the cabinet 10, which is convenient for external wiring through the AC bus 17 from the lower end of the cabinet 10.

[0035] Preferably, as shown in Figure 1 The cabinet 10 is provided with a heat dissipation pipeline, and a liquid cooling machine 18 is arranged at the left side of the cabinet 10 and communicates with the heat dissipation pipeline. The heat dissipation pipeline in the cabinet 10 cooperates with the liquid cooling machine 18 to dissipate heat of the components in the cabinet 10, thereby reducing the temperature of the components in the cabinet 10, improving the heat dissipation effect, and avoiding damage of the components in the cabinet 10 due to high operating temperature, thereby prolonging the service life of the energy storage device. The liquid cooling machine 18 is arranged at the left side of the cabinet 10, which is compact in structure and is arranged separately from the energy storage unit 11, thereby avoiding mixed arrangement with the electrical components and facilitating installation and maintenance of the liquid cooling machine 18 and the energy storage unit 11.

[0036] Preferably, as shown in Figure 1 and Figure 2 The lower part of the liquid cooling machine 18 of the cabinet 10 is also provided with power distribution components 19, and the power distribution components 19 include a step-down transformer 20 connected with the AC bus 17, and the step-down transformer 20 supplies power to the liquid cooling machine 18.

[0037] The power supply of the power distribution components 19 is connected to the step-down transformer 20, that is, the AC power of the power distribution components 19 is reduced to the voltage required by the liquid cooling machine 18 through the step-down transformer 20, and then the liquid cooling machine 18 is supplied with power, and the liquid cooling machine 18 does not need to be connected to the power supply, thereby the energy storage device is complete in function and complete in system. The lower part of the liquid cooling machine 18 of the cabinet 10 is provided with the power distribution components 19, which can effectively utilize the space in the cabinet 10, and the structure is compact.

[0038] Preferably, as shown in Figure 1 and Figure 2 The power distribution components 19 further include a controller 21 for controlling the operation of the energy storage unit 11, and the step-down transformer 20 supplies power to the controller 21.

[0039] Specifically, the controller 21 can control the operation of each energy storage unit 11 according to external instructions or parameters of the battery module 12 detected by the internal battery management system 14, and control whether each energy storage unit 11 is charged or discharged. The step-down transformer 20 supplies power to the controller 21, and the controller 21 does not need to be connected to the power supply, thereby the energy storage device is complete in function and complete in system.

[0040] Preferably, as shown in Figure 1 andFigure 2 As shown, the power distribution device 19 further comprises a switch 22 for interacting with external control information and sending control information to the controller 21, and the step-down transformer 20 supplies power to the switch 22.

[0041] The switch 22 can interact with external devices, and can send the received control information to the controller 21, and the controller 21 can control the energy storage unit 11 according to the accepted control information. The step-down transformer 20 supplies power to the switch 22, and the switch 22 does not need to be additionally connected to the power supply, so that the energy storage device of the utility model has complete functions and a complete system.

[0042] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the utility model, and are not a limitation on the scope of protection of the utility model. Although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the utility model can be modified or replaced equivalently without departing from the essence and scope of the technical solutions of the utility model.

Claims

1. An energy storage device, characterized in that, include: The cabinet contains multiple energy storage units connected in parallel within it. Each energy storage unit includes a battery module, an energy storage inverter electrically connected to the battery module, and a battery management system for detecting the operating parameters of the battery module.

2. The energy storage device according to claim 1, characterized in that: The energy storage converter and the battery management system within each energy storage unit are combined to form a fused energy storage converter.

3. The energy storage device according to claim 2, characterized in that: Each of the integrated energy storage converters is also equipped with a DC-DC converter module, the two ends of which are electrically connected to the battery module and the energy storage converter in the energy storage unit.

4. The energy storage device according to claim 3, characterized in that: The capacity of each battery module is different.

5. An energy storage device according to claim 3 or 4, characterized in that: Each of the energy storage units is stacked vertically within the cabinet.

6. An energy storage device according to claim 5, characterized in that: The lower part of the energy storage unit inside the cabinet is also provided with an AC combiner box for external wiring, and the AC combiner box is electrically connected to each of the energy storage units.

7. An energy storage device according to claim 6, characterized in that: The cabinet is equipped with heat dissipation pipes, and a liquid chiller connected to the heat dissipation pipes is located on the left side of the cabinet.

8. An energy storage device according to claim 7, characterized in that: The lower part of the liquid chiller in the cabinet is also equipped with power distribution devices, including a step-down transformer connected to the AC combiner box, which supplies power to the liquid chiller.

9. An energy storage device according to claim 8, characterized in that: The power distribution device also includes a controller that controls the operation of the energy storage unit, and the step-down transformer supplies power to the controller.

10. An energy storage device according to claim 9, characterized in that: The power distribution device also includes a switch that exchanges control information with the external system and sends control information to the controller, and the step-down transformer supplies power to the switch.

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