PLC + DCS-based zinc-bromine flow battery management unit

Abstract

The utility model discloses a PLC + DCS-based zinc-bromine flow battery management unit, which belongs to the field of zinc-bromine flow batteries, and comprises a power supply module, a PLC module, a DCS system and a sensor module, the power supply module is used for supplying power to the PLC module, the DCS system and the sensor module, the PLC module monitors and controls the zinc-bromine flow battery through feedback signals transmitted by the sensor module and analog quantity data transmitted by the DCS system, and the DCS system realizes temperature acquisition and electric quantity acquisition through the sensor module. The sensor module is connected with the PLC module, converts collected data into analog quantity data and then sends the analog quantity data to the PLC module, and the sensor module is connected with the PLC module, the DCS system and the zinc-bromine flow battery and correspondingly transmits the collected data or signals to the PLC module and the DCS system; according to the invention, the DCS system is added to replace an acquisition unit in the PLC module, so that the cost of the battery management unit is greatly reduced.

Description

Technical Field

[0001] The invention belongs to the field of zinc-bromine liquid flow batteries, and in particular relates to a zinc-bromine liquid flow battery management unit based on PLC+DCS. Background Art

[0002] Battery Management Unit, hereinafter referred to as BMU, is an electronic device used to monitor, control and protect batteries. The working principle of BMU is to determine the state and health of the battery by reading the battery's current, voltage, temperature and other parameters, and to manage charging and discharging as needed. BMU can also monitor battery failures and abnormal conditions, and send out alarm signals for timely processing. A zinc-bromine flow battery module is composed of energy storage components (liquid storage tanks), reaction components (fuel stacks, consisting of bipolar plates and microporous membranes), auxiliary components (pipes, pumps, valves, ventilators, etc. connecting the components) and control systems. For zinc-bromine flow batteries, BMU is to monitor the bus voltage, fuel stack current, fuel stack and electrolyte temperature in real time, and control the output of pumps, ball valves, ventilators, etc., so BMU is an indispensable part of zinc-bromine flow battery modules.

[0003] The battery management units commonly used in the market are currently written based on single-chip microcomputers or PLCs.

[0004] (1) BMU based on single-chip microcomputers has some undeniable disadvantages for various types of single-chip microcomputers, such as 51-type single-chip microcomputers: few registers, many functions need external expansion; although the I / O port is easy to use, the output capacity is not strong; high power consumption, poor protection ability, it is easy to burn out the chip; no self-programming ability, etc. For example, the C language writing of AVR single-chip microcomputer and 51 is quite different, which makes many engineers who learn 51 very uncomfortable; and it cannot deal with immediate numbers directly, so its versatility is reduced.

[0005] (2) PLC-based BMU has great advantages over single-chip microcomputers, such as short development cycle, ease of use, stable quality, and ease of use. However, it still has the disadvantage of being expensive. Utility Model Content

[0006] In view of the above problems, the purpose of the present invention is to propose a zinc-bromine liquid flow battery management unit based on PLC+DCS, wherein DCS is a distributed control system with a data acquisition function; the present invention replaces the expensive acquisition module in the PLC by using the acquisition module in the DCS system, wherein the PLC is responsible for controlling the output point and the DCS is responsible for acquiring the analog quantity, thereby making the unit have the advantages of high reliability, good stability, strong programmability, easy maintenance, and affordable price.

[0007] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present invention is as follows: it includes a power module, a PLC module, a DCS system and a sensor module; the power module is used to supply power to the PLC module, the DCS system and the sensor module; the PLC module realizes monitoring and control of the zinc-bromine liquid flow battery through the feedback signal transmitted by the sensor module and the analog data transmitted by the DCS system; the DCS system uses the YC1006 acquisition module to realize temperature acquisition and power acquisition of the zinc-bromine liquid flow battery, and sends the acquired data to the PLC module; the sensor module is respectively connected to the PLC module, the DCS system and the zinc-bromine liquid flow battery, and transmits the acquired data or signal to the PLC module and the DCS system accordingly.

[0008] The aforementioned PLC+DCS-based zinc-bromine flow battery management unit, wherein the feedback signal includes a ball valve fully opened feedback signal, a ball valve fully closed feedback signal, a zinc liquid flow reflux feedback signal, a bromine liquid flow reflux feedback signal and an electrolyte leakage feedback signal.

[0009] In the aforementioned PLC+DCS-based zinc-bromine flow battery management unit, the DCS system realizes temperature acquisition through the temperature sensor in the sensor module. There are three temperature sensors, which use PT100 platinum resistance to respectively acquire the temperatures of the two battery stacks and the positive electrolyte storage tank.

[0010] The aforementioned zinc-bromine liquid flow battery management unit based on PLC+DCS, the DCS system realizes current collection and voltage collection through the current sensor and voltage sensor in the sensor module, the current sensor is provided with four, using Hall current sensors to collect the charge and discharge current of the battery sub-stack; the voltage sensor is provided with one, using a voltage transmitter to collect the charge and discharge voltage of the battery module.

[0011] In the aforementioned zinc-bromine flow battery management unit based on PLC+DCS, the sensor module also includes a flow sensor and a leakage sensor; the flow sensor is provided with two non-contact level sensors, which are respectively installed on the horizontal return pipes on the zinc side and the bromine side, and the normality of the liquid circuit is determined by whether there is electrolyte flowing in the return pipe. If it is normal, the flow sensor will send a feedback signal to the PLC module. The leakage sensor uses a "humidity-sensitive" sensor, which uses the fact that the electrolyte leaks into the "humidity-sensitive" sensing component, causing its resistance to drop significantly. The PLC will give an alarm signal after knowing the electrolyte leakage through the feedback signal of the leakage sensor.

[0012] The aforementioned zinc-bromine liquid flow battery management unit based on PLC+DCS, the PLC module uses ST20 of S7-200SMART as the core controller.

[0013] Compared with the prior art, the management control unit for zinc-bromine flow battery proposed in the present invention has the following features:

[0014] Beneficial effects:

[0015] 1. The present invention greatly reduces the cost of the battery management unit by adding a DCS system to replace the acquisition unit in the PLC module.

[0016] 2. By adding a liquid flow sensor, the present invention can obtain relevant information in time when a liquid path problem occurs in the zinc-bromine liquid flow battery; by adding a leakage sensor, the present invention can sense electrolyte leakage problems in time.

[0017] 3. The present invention uses five sensors in combination to integrate the signals of all monitored parts. Once a problem occurs somewhere, the system will immediately alarm, effectively protecting the safety and stability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the electrochemical reaction principle of the zinc-bromine flow battery in the present invention.

[0019] Figure 2 The hardware structure diagram of the PLC and DCS in the zinc-bromine flow battery management unit of the present invention.

[0020] Figure 3 The figure is a hardware assembly diagram of the PLC and DCS in the zinc-bromine flow battery management unit of the present invention. DETAILED DESCRIPTION

[0021] In order to better understand the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings.

[0022] like Figure 1 As shown, it is a schematic diagram of the electrochemical reaction principle of the zinc-bromine flow battery. The zinc bromide electrolyte is stored in a storage tank, which is connected to the battery stack (reactor) by a pipeline. The electrolyte circulates back and forth in the storage tank and the battery stack through a pump and a ball valve. A chemical reaction occurs in the battery stack to accumulate and release electric charges, thereby realizing charging and discharging to have the charging and discharging characteristics of a battery.

[0023] Based on the above characteristics of zinc-bromine flow battery, this embodiment proposes a method such as Figure 2 and Figure 3A zinc-bromine liquid flow battery management unit based on PLC+DCS is shown, comprising a power module, a PLC module, a DCS system and a sensor module; the power module is used to supply power to the PLC module, the DCS system and the sensor module; the PLC module monitors and controls the zinc-bromine liquid flow battery through the feedback signal transmitted by the sensor module and the analog data transmitted by the DCS system; the DCS system uses the YC1006 acquisition module to acquire temperature and power of the zinc-bromine liquid flow battery, and sends the acquired data to the PLC module; the sensor module is connected to the PLC module, the DCS system and the zinc-bromine liquid flow battery respectively, and transmits the acquired data or signal to the PLC module and the DCS system accordingly.

[0024] The feedback signals include a ball valve fully opened feedback signal, a ball valve fully closed feedback signal, a zinc liquid flow reflux feedback signal, a bromine liquid flow reflux feedback signal and an electrolyte leakage feedback signal.

[0025] Preferably, the DCS system realizes temperature collection through the temperature sensor in the sensor module. There are three temperature sensors, which use PT100 platinum resistance to collect the temperatures of the two battery stacks and the positive electrode electrolyte storage tank respectively.

[0026] Preferably, the DCS system realizes current collection and voltage collection through the current sensor and voltage sensor in the sensor module. The current sensors are provided with four, and Hall current sensors are used to collect the charge and discharge current of the battery sub-stack; the voltage sensor is provided with one, and a voltage transmitter is used to collect the charge and discharge voltage of the battery module.

[0027] Preferably, the sensor module also includes a liquid flow sensor and a liquid leakage sensor; the liquid flow sensor is provided with two, using non-contact liquid level sensors, which are respectively installed on the horizontal return pipes on the zinc side and the bromine side, and whether the liquid circuit is normal is determined by whether there is electrolyte flowing in the return pipe. If it is normal, the liquid flow sensor will send a feedback signal to the PLC module. The liquid leakage sensor uses a "humidity-sensitive" sensor, which uses the fact that electrolyte leakage seeps into the "humidity-sensitive" sensing component to cause its resistance to drop significantly. The PLC will give an alarm signal after knowing the electrolyte leakage through the feedback signal of the liquid leakage sensor.

[0028] Preferably, the PLC module uses ST20 of S7-200SMART as the core controller.

[0029] In this embodiment, the PLC module and the DCS system are connected via RS-485 / modbus RTU communication, and the DCS system outputs the collected analog data to the CPU to detect data such as voltage, current, and temperature in real time.

[0030] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A zinc-bromine flow battery management unit based on PLC+DCS, characterized in that: The invention comprises a power module, a PLC module, a DCS system and a sensor module; the power module is used to supply power to the PLC module, the DCS system and the sensor module; the PLC module realizes monitoring and control of the zinc-bromine liquid flow battery through the feedback signal transmitted by the sensor module and the analog data transmitted by the DCS system; the DCS system uses the YC1006 acquisition module to realize temperature acquisition and power acquisition of the zinc-bromine liquid flow battery, and sends the acquired data to the PLC module; the sensor module is respectively connected with the PLC module, the DCS system and the zinc-bromine liquid flow battery, and transmits the acquired data or signal to the PLC module and the DCS system accordingly.

2. A zinc-bromine liquid flow battery management unit based on PLC+DCS according to claim 1, characterized in that: The feedback signals include a ball valve fully opened feedback signal, a ball valve fully closed feedback signal, a zinc liquid flow reflux feedback signal, a bromine liquid flow reflux feedback signal and an electrolyte leakage feedback signal.

3. A zinc-bromine liquid flow battery management unit based on PLC+DCS according to claim 2, characterized in that: The DCS system realizes temperature collection through the temperature sensor in the sensor module. There are three temperature sensors, which use PT100 platinum resistance to collect the temperature of two battery stacks and the positive electrolyte storage tank of the zinc-bromine flow battery respectively.

4. A zinc-bromine flow battery management unit based on PLC+DCS according to claim 2, characterized in that: The DCS system realizes current and voltage collection through the current sensor and voltage sensor in the sensor module. There are four current sensors, which use Hall current sensors to collect the charge and discharge current of the battery sub-stack; there is one voltage sensor, which uses a voltage transmitter to collect the charge and discharge voltage of the battery module.

5. A zinc-bromine liquid flow battery management unit based on PLC+DCS according to claim 2, characterized in that: The sensor module also includes a liquid flow sensor and a liquid leakage sensor; two liquid flow sensors are provided, which adopt non-contact liquid level sensors and are respectively installed on the horizontal return pipes on the zinc side and the bromine side. Whether the liquid circuit is normal is judged by whether there is electrolyte flowing in the return pipe. If it is normal, the liquid flow sensor will send a feedback signal to the PLC module; the liquid leakage sensor adopts a "humidity-sensitive" sensor, which uses the fact that electrolyte leakage seeps into the "humidity-sensitive" sensing component to cause its resistance to drop significantly. After the PLC learns of the electrolyte leakage through the feedback signal of the leakage sensor, it will give an alarm signal.

6. A zinc-bromine flow battery management unit based on PLC+DCS according to claim 1, characterized in that: The PLC module uses ST20 of S7-200SMART as the core controller.

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