Bidirectional intelligent lithium battery management system with solar photovoltaic charging function

Abstract

The utility model relates to the technical field of battery management, in particular to a bidirectional intelligent lithium battery management system with solar photovoltaic charging, which comprises a solar photovoltaic panel, a plurality of lithium batteries connected in parallel, an MOS (metal oxide semiconductor) tube, an upper computer, an RS485 / CAN (controller area network), an intelligent lithium battery MCU (microprogrammed control unit) / DSP (digital signal processor) and an AFE front-end analog signal, a plurality of lithium batteries are connected in parallel to realize capacity expansion and power expansion so as to supply power to electric appliances, an intelligent lithium battery is connected in parallel with an intelligent lithium battery RS485 / CAN communication port, and a solar photovoltaic panel is connected with a plurality of lithium batteries which are connected in parallel. Inverting and switching power supply charging are compatible, and meanwhile solar photovoltaic direct charging can be independently achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery management, in particular to a bidirectional intelligent lithium battery management system with solar photovoltaic charging. Background Art

[0002] Currently, the intelligent lithium battery management system on the market adopts the two-in-one technology of buck-boost DC to DC conversion and BMS positive terminal protection main switch power component. The battery pack composed of the intelligent lithium battery management system can realize parallel connection of multiple intelligent lithium battery packs to expand power and discharge and charge at the same time. It can be connected in parallel with lead-acid batteries and ordinary lithium battery packs to achieve the function of simultaneous capacity and power expansion; but the intelligent lithium battery system with buck-boost DC to DC conversion and BMS positive terminal protection on the market can only be charged in an environment with a bidirectional inverter or switching power supply charger. Solar photovoltaic charging requires a special MPPT controller and cannot be directly charged with solar photovoltaic. This intelligent lithium battery system management system uses its own DC to DC buck-boost system to add MPPT software automatic algorithm. While being compatible with inverter and switching power supply charging, it can also realize direct solar photovoltaic charging independently. Utility Model Content

[0003] The purpose of the present utility model is to provide a bidirectional intelligent lithium battery management system with solar photovoltaic charging to solve the problems raised in the above background technology.

[0004] To achieve the above objectives, the present invention provides the following technical solutions: a bidirectional intelligent lithium battery management system with solar photovoltaic charging, comprising a solar photovoltaic panel, multiple lithium batteries connected in parallel, a MOS tube, a host computer, RS485 / CAN, an intelligent lithium battery MCU / DSP, and an AFE front-end analog signal. The anodes of the multiple lithium batteries are connected in parallel, and the cathodes are connected in parallel. The multiple lithium batteries are connected in parallel to expand the capacity and power, thereby supplying power to electrical appliances. The intelligent lithium battery is connected in parallel with the intelligent lithium battery RS485 / CAN communication port, and the solar photovoltaic panel is connected to the multiple parallel lithium batteries.

[0005] Preferably, the host computer is connected to RS485 / CAN, and the host computer sets the intelligent lithium battery MCU / DSP to MPPT charging mode through RS485 / CAN.

[0006] Preferably, the intelligent lithium battery management system adopts balanced current control. When multiple intelligent lithium batteries are used in parallel, solar photovoltaic can realize the simultaneous charging and discharging of multiple lithium batteries and expand the power.

[0007] Preferably, the lithium battery is a more conventional power source on the market and is compatible with solar charging function.

[0008] Preferably, the AFE front-end analog signal detection is used to detect the status of the battery pack.

[0009] Preferably, the MOS tubes Q1, Q2, Q3, Q4, inductor L1 and MCU / DSP form a DC-DC BUCK-BOOST step-up and step-down bidirectional circuit. The MCU / DSP automatically tracks the luminous energy of the solar photovoltaic panel and adjusts the PWM control Q1 Q2 Q3 Q4 in real time to boost or buck the voltage, thereby achieving the maximum energy conversion efficiency of charging.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] 1. Fewer switching elements can be used. The power MOS can not only realize BMS switch protection, but also realize DC to DC buck-boost energy conversion. The overall circuit conversion efficiency is high and the cost is low.

[0012] 2. Realize wide voltage input and output function, and can be used in parallel with lead-acid batteries and ordinary lithium battery packs;

[0013] 3. Function of expanding capacity and power when connecting smart lithium batteries in parallel;

[0014] 4. Compatible with inverters, switching power supplies, and solar photovoltaic panels for direct charging in multiple charging environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the system block diagram.

[0016] Figure 2 This is the working principle of smart lithium battery. DETAILED DESCRIPTION

[0017] In order to deepen the understanding and recognition of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described and introduced in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the embodiments in any form. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0018] See also Figure 1-2The utility model provides a technical solution: a bidirectional intelligent lithium battery management system with solar photovoltaic charging, including a solar photovoltaic panel, multiple lithium batteries connected in parallel, a MOS tube, a host computer, RS485 / CAN, an intelligent lithium battery MCU / DSP and an AFE front-end analog signal. The anodes of the multiple lithium batteries are connected in parallel, and the cathodes are connected in parallel. The multiple lithium batteries are connected in parallel to expand the capacity and power, thereby supplying power to electrical appliances. The intelligent lithium battery is connected in parallel with the intelligent lithium battery RS485 / CAN communication port. The solar photovoltaic panel is connected to the multiple parallel lithium batteries. The output voltage is adjusted by detecting the current of a single intelligent battery pack to achieve expanded power input / output.

[0019] The host computer is connected to RS485 / CAN. The host computer sets the intelligent lithium battery MCU / DSP to MPPT charging mode through RS485 / CAN, and adjusts PWM in real time by automatically tracking the luminous energy of the solar photovoltaic panel.

[0020] The intelligent lithium battery management system adopts balanced current control. When multiple intelligent lithium batteries are used in parallel, solar photovoltaic can realize the simultaneous charging and discharging of multiple lithium batteries to expand the power, so that the use of lithium batteries is more consistent. When a fault occurs, it can clearly determine which lithium battery has failed, and thus cut off the group of lithium batteries from the circuit, thereby protecting the safety of the entire circuit, and can achieve efficient energy conversion while protecting the circuit with fewer switching elements.

[0021] Lithium batteries are a more common power source on the market and are compatible with solar charging functions, making the source of lithium batteries easier to obtain and greatly reducing corporate costs.

[0022] The AFE front-end analog signal detection is used to check the status of the battery pack. When a battery fails, the MOS tube can be used to shut down the charging input or discharging output, thereby realizing the BMS abnormal protection function.

[0023] MOS tubes Q1, Q2, Q3, Q4, inductor L1, and MCU / DSP form a DC-DC buck-boost bidirectional circuit. The MCU / DSP automatically tracks the luminous energy of the solar photovoltaic panel and adjusts the PWM control of Q1, Q2, Q3, and Q4 in real time to boost or buck the voltage, thereby achieving maximum charging energy conversion efficiency and realizing DC-to-DC energy conversion. The overall circuit conversion efficiency is high and can effectively reduce costs.

[0024] Working Principle: BAT1 to BAT16 are lithium battery packs. The AFE front-end analog signal detection is mainly used to detect the status of the battery pack. MOS tubes Q1, Q2, Q3, Q4, inductor L1 and MCU / DSP form a DC-DC buck-boost bidirectional circuit. The VIN / VOUT+ and VIN / VOUT- terminals are common ports for charging / discharging. The MCU / DSP mainly communicates with the AFE through IIC / SPI to detect the status of the lithium battery pack. The MCU / DSP detects the external power supply voltage signal through R5 / / R6 and the battery pack voltage status through R7 / / R8, and does not modulate the PWM waveform to control Q1, Q2, Q3, and Q4 to boost or buck. When there is a battery fault or an external fault signal, the charging input or discharge output is shut down by shutting down Q1, Q2, Q3, and Q4, realizing the conventional BMS abnormal protection function. The MCU / DSP feeds back information about the smart lithium battery to the host computer through RS485 / CAN, or controls the working mode of the smart lithium battery through the host computer.

[0025] Although the embodiments of the present invention have been shown and described, it should be emphasized that the above description is merely an introduction and description of the use of the embodiments of the present invention and does not limit the present invention in any form. It will be understood by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bidirectional intelligent lithium battery management system with solar photovoltaic charging, including solar photovoltaic panels, multiple lithium batteries connected in parallel, MOS tubes, a host computer, RS485 / CAN, an intelligent lithium battery MCU / DSP and AFE front-end analog signals, characterized by: The anodes of multiple lithium batteries are connected in parallel, and the cathodes are connected in parallel. Multiple lithium batteries are connected in parallel to expand capacity and power, thereby powering electrical appliances. Smart lithium batteries are connected in parallel with their RS485 / CAN communication ports, and solar photovoltaic panels are connected to multiple parallel lithium batteries.

2. A bidirectional intelligent lithium battery management system with solar photovoltaic charging according to claim 1, characterized in that: The host computer is connected to RS485 / CAN, and the host computer sets the intelligent lithium battery MCU / DSP to MPPT charging mode through RS485 / CAN.

3. The bidirectional intelligent lithium battery management system with solar photovoltaic charging according to claim 1, characterized in that: The intelligent lithium battery management system adopts balanced current control. When multiple intelligent lithium batteries are used in parallel, solar photovoltaic can realize the simultaneous charging and discharging of multiple lithium batteries to expand power.

4. The bidirectional intelligent lithium battery management system with solar photovoltaic charging according to claim 1, characterized in that: The lithium battery is a relatively common power source on the market and is compatible with solar charging functions.

5. The bidirectional intelligent lithium battery management system with solar photovoltaic charging according to claim 1, characterized in that: The AFE front-end analog signal detection is used to detect the status of the battery pack.

6. The bidirectional intelligent lithium battery management system with solar photovoltaic charging according to claim 1, characterized in that: The MOS tubes Q1, Q2, Q3, Q4, inductor L1 and MCU / DSP form a DC-DC BUCK-BOOST bidirectional circuit. The MCU / DSP automatically tracks the luminous energy of the solar photovoltaic panel and adjusts the PWM control Q1, Q2, Q3 and Q4 in real time to boost or buck the voltage, thereby achieving maximum energy conversion efficiency for charging.

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