Equalization device of energy storage system and charging system

Abstract

The utility model belongs to the field of energy storage, and particularly provides an energy storage system balancing device and a charging system, and the energy storage system balancing device comprises N energy storage modules and a high-voltage box. The energy storage module comprises a battery module, a BMU controller and a bypass relay K1. One-to-one management is carried out on battery modules in the energy storage system balancing device, in the charging and discharging process, if it is detected that the voltage of the battery modules reaches the specified maximum value or minimum value, a bypass relay K1 is controlled to be switched on, the battery modules are bypassed, and the other battery modules continue to operate; and the charging or discharging process is completed until all the battery modules are bypassed, so that the utilization rate of the battery cells in the battery modules is increased, and the charging and discharging conversion efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of energy storage, and specifically provides an energy storage system balancing device and a charging system. Background Art

[0002] The charging and discharging of the energy storage system is the process of storing and releasing energy. The conversion efficiency of electric energy in the whole process is related to the income of the power station. If the charging and discharging conversion efficiency of the energy storage system is low, it will not only waste a lot of capacity, but also reduce the income of the power station.

[0003] The energy storage power station in the related technology adopts stack-level management during charging and discharging. The battery array unit (BAU) controls the operation of the entire stack. When a certain cell in a stack reaches the specified maximum or minimum voltage value, charging or discharging will be stopped. Some energy storage power stations also use cluster-level management. When a certain cell in a stack reaches the specified maximum or minimum voltage value, the cluster where the cell is located will be removed to achieve the purpose of bypass, and the remaining clusters will continue to operate. The two charging and discharging strategies will result in a large number of cells not being used.

[0004] How to improve the utilization rate of battery cells in energy storage systems is an urgent issue to be solved. Utility Model Content

[0005] The purpose of the utility model is to provide an energy storage system balancing device and a charging system.

[0006] In order to solve the above technical problems, the utility model provides an energy storage system balancing device, comprising:

[0007] N energy storage modules and high-voltage boxes;

[0008] N energy storage modules are connected in series and electrically connected to the high-voltage box;

[0009] The energy storage module includes: a battery module, a BMU controller and a bypass relay K1;

[0010] The BMU controller is electrically connected to the battery module and the control end of the relay K1 respectively;

[0011] The driving end of the relay K1 is respectively connected between the positive electrode and the negative electrode of the battery module;

[0012] Wherein, N is greater than or equal to 1.

[0013] Furthermore, the BMU controller is configured to detect the voltage of the battery module, and when the detected voltage is greater than a maximum value or less than a minimum value, control the bypass relay K1 to be turned on.

[0014] Furthermore, the energy storage module further comprises a positive relay K2, and the positive lead of the battery module is connected in series with a driving end of the positive relay K2;

[0015] The control end of the positive relay K2 is electrically connected to the BMU controller.

[0016] Furthermore, the BMU controller is also configured to control the positive relay K2 to be disconnected when the detected voltage is greater than a maximum value or less than a minimum value.

[0017] Furthermore, the energy storage module further includes a negative electrode relay K3, and the negative electrode lead of the battery module is connected in series with the driving end of the negative electrode relay K3;

[0018] The control end of the negative relay K3 is electrically connected to the BMU controller.

[0019] Furthermore, the BMU controller is also configured to control the negative electrode relay K3 to be disconnected when the detected voltage is greater than a maximum value or less than a minimum value.

[0020] Furthermore, the positive lead of the battery module is connected in series with a positive fuse FU1.

[0021] Furthermore, the negative electrode lead of the battery module is connected in series with a negative electrode fuse FU2.

[0022] This embodiment also provides a charging system, including:

[0023] A charging device, a master controller and an energy storage system balancing device as described above;

[0024] The master controller is electrically connected to each of the BMU controllers;

[0025] The charging device is electrically connected to the high-voltage box of the energy storage system balancing device.

[0026] Further, the master controller is configured to send a charging instruction to the BMU controller upon receiving a charging instruction;

[0027] The BMU controller is also configured to control all bypass relays K1 to be disconnected when receiving a charging instruction.

[0028] The beneficial effect of the utility model is that the utility model provides an energy storage system balancing device and a charging system, wherein the energy storage system balancing device includes: N energy storage modules and a high-voltage box; N energy storage modules are connected in series and electrically connected to the high-voltage box; the energy storage module includes: a battery module, a BMU controller and a bypass relay K1; the BMU controller is electrically connected to the control end of the battery module and the relay K1 respectively; the driving end of the relay K1 is respectively connected between the positive electrode and the negative electrode of the battery module; wherein N is greater than or equal to 1. By managing the battery modules in the energy storage system balancing device one-to-one, during the charging and discharging process, if it is detected that the voltage of the battery module reaches the specified maximum value or minimum value, the bypass relay K1 will be controlled to be turned on, the battery module will be bypassed, and the remaining battery modules will continue to operate until all the battery modules are completely bypassed, and the charging or discharging process is completed, thereby increasing the utilization rate of the battery cells in the battery module and increasing the charging and discharging conversion efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0030] Figure 1 It is a principle block diagram of the energy storage system balancing device provided in the embodiment of the utility model.

[0031] Figure 2 It is a principle block diagram of the energy storage module provided in the embodiment of the utility model.

[0032] Figure 3 It is a partial principle block diagram of the charging system provided by the embodiment of the utility model. DETAILED DESCRIPTION

[0033] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0034] For examples, see Figure 1-Figure 3 At least one embodiment provides an energy storage system balancing device, comprising: N energy storage modules and a high-voltage box; the N energy storage modules are connected in series and electrically connected to the high-voltage box; the energy storage module comprises: a battery module, a BMU controller and a bypass relay K1; the BMU controller is electrically connected to the control end of the battery module and the relay K1 respectively; the driving end of the relay K1 is respectively connected between the positive electrode and the negative electrode of the battery module; wherein N is greater than or equal to 1.

[0035] The BMU controller is configured to detect the voltage of the battery module, and when the detected voltage is greater than the maximum value or less than the minimum value, control the bypass relay K1 to conduct. By managing the battery modules in the energy storage system balancing device one-to-one, during the charging and discharging process, if it is detected that the voltage of the battery module reaches the specified maximum value or minimum value, the bypass relay K1 will be controlled to conduct, bypass the battery module, and the remaining battery modules will continue to operate until all battery modules are bypassed, completing the charging or discharging process, thereby increasing the utilization rate of the battery cells in the battery module and increasing the charging and discharging conversion efficiency.

[0036] In order to further ensure the reliability of the bypass, in some embodiments, the energy storage module further includes a positive relay K2, and the driving end of the positive relay K2 is connected in series to the positive lead of the battery module; the control end of the positive relay K2 is electrically connected to the BMU controller. The control process is as follows: the BMU controller is also configured to control the positive relay K2 to disconnect when the detected voltage is greater than the maximum value or less than the minimum value.

[0037] In order to further ensure the reliability of the bypass, in some embodiments, the energy storage module further includes a negative electrode relay K3, and the negative electrode lead of the battery module is connected in series with the driving end of the negative electrode relay K3; the control end of the negative electrode relay K3 is electrically connected to the BMU controller. The control process is as follows: the BMU controller is also configured to control the negative electrode relay K3 to disconnect when the detected voltage is greater than the maximum value or less than the minimum value.

[0038] In some embodiments, the positive lead of the battery module is connected in series with a positive fuse FU1. The negative lead of the battery module is connected in series with a negative fuse FU2. By setting a fuse, the circuit is protected to prevent damage to the system when the current is too large.

[0039] At least one embodiment further provides a charging system, comprising: a charging device, a master controller and an energy storage system balancing device; the master controller is electrically connected to each of the BMU controllers; the charging device is electrically connected to the high-voltage box of the energy storage system balancing device.

[0040] The master controller is configured to send a charging instruction to the BMU controller upon receiving a charging instruction; the BMU controller is also configured to control all bypass relays K1 to be disconnected upon receiving a charging instruction, and at the same time, control the positive relay K2 and the negative relay K3 to be turned on.

[0041] The master controller is also configured to send a discharge instruction to the BMU controller upon receiving a discharge instruction, control all bypass relays K1 to be disconnected, and control the positive relay K2 and the negative relay K3 to be turned on, so as to complete the charge and discharge management of the balancing device of the entire energy storage system, thereby improving the utilization rate of the cell capacity in the battery module and increasing the charge and discharge conversion efficiency.

[0042] In summary, the utility model provides an energy storage system balancing device and a charging system, wherein the energy storage system balancing device includes: N energy storage modules and a high-voltage box; N energy storage modules are connected in series and electrically connected to the high-voltage box; the energy storage module includes: a battery module, a BMU controller and a bypass relay K1; the BMU controller is electrically connected to the control end of the battery module and the relay K1 respectively; the driving end of the relay K1 is respectively connected between the positive electrode and the negative electrode of the battery module; wherein N is greater than or equal to 1. By managing the battery modules in the energy storage system balancing device one-to-one, during the charging and discharging process, if it is detected that the voltage of the battery module reaches the specified maximum value or minimum value, the bypass relay K1 will be controlled to be turned on, the battery module will be bypassed, and the remaining battery modules will continue to operate until all the battery modules are completely bypassed, and the charging or discharging process is completed, thereby increasing the utilization rate of the battery cells in the battery module and increasing the charging and discharging conversion efficiency.

[0043] All devices (parts without specific structure) selected in this application are universal standard parts or parts known to those skilled in the art, and their structures and principles can be known by those skilled in the art through technical manuals or conventional experimental methods. In addition, the software programs involved in this application are all prior art, and this application does not involve any improvement to the software programs.

[0044] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0046] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0047] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0048] In addition, each functional unit in each embodiment of the present utility model may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0049] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An energy storage system balancing device, characterized in that: include: N energy storage modules and high-voltage boxes; N energy storage modules are connected in series and electrically connected to the high-voltage box; The energy storage module includes: a battery module, a BMU controller and a bypass relay K1; The BMU controller is electrically connected to the battery module and the control end of the relay K1 respectively; The driving end of the relay K1 is respectively connected between the positive electrode and the negative electrode of the battery module; Wherein, N is greater than or equal to 1.

2. The energy storage system balancing device according to claim 1, characterized in that: The BMU controller is configured to detect the voltage of the battery module, and when the detected voltage is greater than a maximum value or less than a minimum value, control the bypass relay K1 to be turned on.

3. The energy storage system balancing device according to claim 2, characterized in that: The energy storage module further includes a positive relay K2, and a driving end of the positive relay K2 is connected in series to the positive lead of the battery module; The control end of the positive relay K2 is electrically connected to the BMU controller.

4. The energy storage system balancing device according to claim 3, characterized in that: The BMU controller is further configured to control the positive relay K2 to be disconnected when the detected voltage is greater than a maximum value or less than a minimum value.

5. The energy storage system balancing device according to claim 2, characterized in that: The energy storage module further includes a negative electrode relay K3, and a driving end of the negative electrode relay K3 is connected in series to the negative electrode lead of the battery module; The control end of the negative relay K3 is electrically connected to the BMU controller.

6. The energy storage system balancing device according to claim 5, characterized in that: The BMU controller is further configured to control the negative electrode relay K3 to be disconnected when the detected voltage is greater than a maximum value or less than a minimum value.

7. The energy storage system balancing device according to claim 1, characterized in that: The positive lead of the battery module is connected in series with a positive fuse FU1.

8. The energy storage system balancing device according to claim 1, characterized in that: The negative electrode lead of the battery module is connected in series with a negative electrode fuse FU2.

9. A charging system, characterized in that: include: A charging device, a master controller, and an energy storage system balancing device as claimed in any one of claims 1 to 8; The master controller is electrically connected to each of the BMU controllers; The charging device is electrically connected to the high-voltage box of the energy storage system balancing device.

10. The charging system according to claim 9, characterized in that: The master controller is configured to send a charging instruction to the BMU controller when receiving a charging instruction; The BMU controller is also configured to control all bypass relays K1 to be disconnected when receiving a charging instruction.

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