Energy storage inverter and battery pack stacking address allocation method thereof

Abstract

The invention relates to an energy storage inverter and a battery pack stacking address allocation method thereof. The method comprises the steps that each battery pack is connected with the inverter through a power bus to transmit electric energy; a subtractor is arranged in each battery pack, when the battery pack is in the first section, the input end, corresponding to the minuend, of the subtractor in the battery pack is connected with the address distribution voltage output end of the inverter, and when the battery pack is not in the first section, the input end, corresponding to the minuend, of the subtractor in the battery pack is connected with the output end of the subtractor in the previous adjacent battery pack; a fixed voltage is input into the input end of each subtractor corresponding to the subtrahend; the battery management unit in each battery pack is connected with the input end, corresponding to the minuend, of the subtractor, automatically allocates the address of the corresponding battery pack based on the voltage collected from the input end, corresponding to the minuend, of the subtractor, and sends the allocated address to the inverter through the communication bus. According to the invention, random allocation of addresses can be realized.

Description

Technical Field

[0001] The present invention relates to the field of electronic technology, and in particular to an energy storage inverter and a method for allocating battery pack stacking addresses thereof. Background Art

[0002] With the development of new energy, the market demand for battery storage capacity of energy storage systems is becoming more and more diversified. In order to meet market requirements and reduce initial development costs and subsequent maintenance costs, battery pack stacking is an efficient and simple battery pack parallel connection solution, which is selected by most related companies. This solution mostly connects battery clusters with the same specifications in parallel. Each battery cluster of this battery management system is controlled and managed by a battery management unit (BMU). In order to ensure the data security of each battery management unit without crosstalk, the communication address of the battery management unit needs to be correctly assigned. Summary of the invention

[0003] In order to solve the above problems, the present invention proposes an energy storage inverter and a method for allocating battery pack stacking addresses thereof.

[0004] The specific plan is as follows:

[0005] A method for allocating addresses of battery pack stacks of an energy storage inverter comprises: each battery pack is connected to an inverter via a power bus to transmit electric energy; a subtractor is arranged in each battery pack, when the battery pack is the first section, the input end of the subtractor corresponding to the minuend in the subtractor is connected to the address allocation voltage output end of the inverter, when the battery pack is not the first section, the input end of the subtractor corresponding to the minuend in the subtractor is connected to the output end of the subtractor in the adjacent previous battery pack; a fixed voltage is input to the input end corresponding to the minuend of each subtractor; a battery management unit in each battery pack is connected to the input end corresponding to the minuend of the subtractor, and the address of the corresponding battery pack is automatically allocated based on the voltage collected from the input end corresponding to the minuend of the subtractor, and the allocated address is sent to the inverter via a communication bus.

[0006] Furthermore, the communication bus adopts CAN bus.

[0007] Furthermore, the fixed voltage input to the input terminal of each subtractor corresponding to the subtrahend is generated by a hardware circuit.

[0008] Furthermore, the fixed voltage input to the input terminal of each subtractor corresponding to the subtrahend is input through the battery management unit.

[0009] An energy storage inverter comprises an inverter and a plurality of battery packs, wherein the energy storage inverter implements the steps of the above method in an embodiment of the present invention.

[0010] The present invention adopts the above technical solution, and can automatically allocate addresses to any device in any interconnected system by inputting the voltage change of the subtractor in any system that has interconnections and needs to allocate addresses, and the number of addresses available for allocation is sufficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 FIG. 1 is a schematic diagram showing a connection method between an inverter and a battery pack in an embodiment of the present invention.

[0012] Figure 2 The figure is a schematic diagram of the control principle of the inverter and the battery pack in the embodiment of the present invention.

[0013] Figure 3 FIG. 1 is a schematic diagram showing the circuit connection between the inverter and the battery pack in an embodiment of the present invention. DETAILED DESCRIPTION

[0014] To further illustrate various embodiments, the present invention provides drawings. These drawings are part of the disclosure of the present invention, which are mainly used to illustrate the embodiments and can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in this field should be able to understand other possible implementations and advantages of the present invention.

[0015] The present invention will now be further described with reference to the accompanying drawings and specific implementation methods.

[0016] The battery packs (Pack1, Pack2, ..., Packn) in the energy storage inverter contain batteries and battery management units. The connection relationship and communication method between the inverter and each battery pack are as follows: Figure 1-3 shown.

[0017] Each battery pack is connected to the inverter via a power bus to transmit electrical energy.

[0018] A subtractor is set in each battery pack. When the battery pack is the first section (i.e., Pack1), the input end of the subtractor corresponding to the minuend is connected to the address-assigned voltage output end (address-assigned voltage 1) of the inverter. When the battery pack is not the first section, the input end of the subtractor corresponding to the minuend is connected to the output end of the subtractor in the adjacent previous battery pack (address-assigned voltage 2-n-1). A fixed voltage (i.e., voltage change) is input to the input end corresponding to the minuend of each subtractor.

[0019] The battery management unit in each battery pack is connected to the input terminal of the subtractor corresponding to the minuend, and automatically allocates the address of the corresponding battery pack based on the voltage collected from the input terminal of the subtractor corresponding to the minuend, and sends the allocated address to the inverter through the communication bus. In this embodiment, the communication bus adopts the CAN bus.

[0020] Based on the above method, after the address allocation voltage 1 sent by the inverter is input into the first battery pack Pack1, it is collected by the battery management unit on Pack1, and the address of the first battery pack Pack1 is automatically allocated based on the collected voltage, and then the address of the first battery pack Pack1 is sent back to the inverter through the communication bus. The address allocation voltage 1 is calculated by the subtractor in the first battery pack Pack1 to obtain the address allocation voltage 2, which is input into the second battery pack Pack2, and is sampled and allocated by the battery management unit on Pack2. The address of the battery pack is sent back to the inverter through the communication bus, and so on. The subsequent Pack3 to Packn are also automatically allocated addresses and sent back to the inverter in this way.

[0021] In one embodiment, the address assigned voltage 1 value is set to 3.3V, and the voltage change is 0.3V. Then, the address assigned voltage collected by the battery management unit in the first battery pack Pack1 is 3.3V, and the voltage collected in the second battery pack Pack2 is (3.3-0.3)V=3V, that is, address assigned voltage n=address assigned voltage 1-((n-1)*voltage change. By modifying the voltage change of the address assigned voltage calculation, the values ​​of different address assigned voltages can be changed, which can greatly increase the number of battery packs in parallel.

[0022] The fixed voltage input to the input terminal of the subtractor corresponding to the subtrahend may be generated by a hardware circuit or input by a battery management unit.

[0023] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, it should be understood by those skilled in the art that various changes may be made to the present invention in form and details without departing from the spirit and scope of the present invention as defined by the appended claims, all of which are within the scope of protection of the present invention.

Claims

1. A method for allocating stacking addresses of energy storage inverter battery packs, characterized in that: include: Each battery pack is connected to the inverter via a power bus to deliver electrical energy; A subtractor is provided in each battery pack. When the battery pack is the first section, the input end of the subtractor corresponding to the minuend is connected to the address distribution voltage output end of the inverter. When the battery pack is not the first section, the input end of the subtractor corresponding to the minuend is connected to the output end of the subtractor in the adjacent previous battery pack. A fixed voltage is input to the input end of each subtractor corresponding to the minuend. The battery management unit in each battery pack is connected to the input terminal of the subtractor corresponding to the minuend, and automatically allocates the address of the corresponding battery pack based on the voltage collected from the input terminal of the subtractor corresponding to the minuend, and sends the allocated address to the inverter through the communication bus.

2. The method for allocating stacking addresses of energy storage inverter battery packs according to claim 1, characterized in that: The communication bus adopts CAN bus.

3. The method for allocating stacking addresses of energy storage inverter battery packs according to claim 1, characterized in that: The fixed voltage input to the input terminal of each subtractor corresponding to the subtrahend is generated by a hardware circuit.

4. The method for allocating stacking addresses of energy storage inverter battery packs according to claim 1, characterized in that: The fixed voltage input to the input terminal of each subtractor corresponding to the subtrahend is input through the battery management unit.

5. An energy storage inverter, characterized in that: The invention comprises an inverter and a plurality of battery packs, wherein the energy storage inverter implements the steps of the method as claimed in any one of claims 1 to 4.

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