CN202435093U - Balanced charging control system for storage battery - Google Patents

Abstract

A storage battery balance charging control system, including charging positive pole and charging negative pole, a discharge module and a CPU controller, the discharge module includes a discharge switch control unit and a discharge switch, each single battery is connected in parallel with a discharge switch, the discharge switch control unit and The CPU controller is connected. The CPU controller is equipped with a single communication line for data transmission with the charger. Each communication line is connected to a first-line communication line; the first-line communication line is connected to the charger. A voltage parameter calculation unit that calculates the real-time voltage parameters of each single battery; it is used to send a pulse discharge command to the discharge switch when the voltage of a certain single battery is higher than the preset voltage value, and until the voltage of all single batteries is equal to A discharge real-time control module that sends out a charging completion status indication when the voltage is higher than a preset voltage value. The utility model simplifies structure, reduces cost and has good applicability.

Description

Battery equalization charging control system

technical field

The utility model relates to the charging and discharging technology of storage battery packs, in particular to a storage battery equalization charging control system.

Background technique

In order to prolong the service life of the battery pack, the balanced charging mode is generally used in the battery pack charging and discharging industry to ensure that the charging voltage, charging current and temperature of each single battery can be within the safe working range of the battery, ensuring that the battery is fully charged and There will be no overcharging phenomenon and temperature runaway phenomenon, ensuring the service life and safe and reliable operation of the battery pack. However, the conventional balanced charging mode has complex wiring and high cost, and the use of batteries has been applied to every field of our life. A good balanced charging method cannot adapt to mass promotion and application.

There is also a balanced charge that is used to discharge in series when discharging, and to charge in parallel when charging. Add a set of series-parallel switching switches. The more single cells in the battery pack, the more complicated the circuit.

There are also complex multi-core plugs used between the charger and the battery pack, which makes the wiring between the charger and the equalizing charging module complicated, which is not conducive to mass promotion.

In addition, the balanced charging of complex systems is controlled by a software communication system, which requires multi-core communication control plugs and sockets; the general charging method is that the two-core output is directly connected to the positive and negative terminals of the battery pack, and most of them use "products". If multi-core plugs and sockets are to be used for the zigzag charger socket, the cost is also high, and the charger is also quite complicated, so it is not easy to popularize in large quantities.

Contents of the invention

In order to overcome the disadvantages of complex structure, high cost and poor applicability of the existing storage battery charging and discharging technology, the utility model provides a battery equalization charging control system with simplified structure, reduced cost and good applicability.

The technical scheme that the utility model solves its technical problem adopts is:

A storage battery balance charging control system, including charging positive poles and charging negative poles, the charging positive poles and charging negative poles are respectively connected to multiple sets of single batteries connected in series, the control system also includes a discharge module and a CPU controller, the discharge module It includes a discharge switch control unit and a discharge switch, each single battery is connected in parallel with a discharge switch, the discharge switch control unit is connected to the CPU controller, and the CPU controller is provided with a single communication line for data transmission with the charger , each communication line is connected to a first-line communication line; the discharge module also includes a battery voltage detection unit, the battery voltage detection unit is connected to a voltage detection branch, and the voltage detection branch includes a resistor R1 and a resistor R2, so The voltage detection branch is connected in parallel with the single battery, the connection node of the resistors R1 and R2 is connected to the battery voltage detection unit; the one-line communication line is connected to a charger, and the charger is used to The data calculates the voltage parameter calculation unit of the real-time voltage parameter of each single battery; it is used to send a pulse discharge command to the discharge switch when the voltage of a certain single battery is higher than the preset voltage value, and until the voltage of all single batteries A discharge real-time control module that sends out a charging completion status indication when both are higher than a preset voltage value.

Further, the discharge module also includes a temperature detection unit, a temperature sensor is installed on the single battery, and the temperature sensor is connected to the temperature detection unit; the charger includes: used to calculate the temperature of each single cell according to the data of the temperature detection unit An operating temperature calculation unit for real-time operating temperature; a temperature real-time monitoring module for determining the magnitude of the discharge current according to the current temperature of a single battery.

Still further, the charger further includes: a power-on ambient temperature calculation unit for storing the temperature of each single battery when power is on.

The charger also includes: an energy-saving control unit for sending a handshake protocol to the discharge module and starting the auxiliary power supply through a clock signal.

The charger also includes: used to calculate the charging capacity of the single battery: the capacity is equal to the product of the actual charging current and time, and then starts the pulse charging of the charger and the negative pulse discharge of the "discharge module" according to the capacity difference of the single battery. Repair control unit for positive and negative repairs.

The discharge switch is connected in series with the current limiting resistor.

The technical concept of the utility model is: a discharge function module (hereinafter referred to as "discharge module") with only one discharge switch is associated with the single battery in the storage battery pack. With the mass promotion of CPU control chips, its price has reached Quite low, everyone knows that the CPU control software is very convenient to compile and modify, and the communication between CPUs is also very convenient. There are RS232, RS485, CAN, USB and other communication methods, but these commonly used methods require multiple lines for communication. , plus the two wires of the positive and negative poles of the charger's power supply, the benefits of this balanced charging industry cannot be widely promoted.

Utilizing the self-made one-line transmission principle of the CPU, one line of the CPU is used for two-way communication, and the voltage and temperature parameters of each group of single cells detected by the "discharge module" in the battery pack are fed back to the control center, so that the overall battery pack and Only three wires are used between the chargers, so the system will be changed quite simply, and the cost is also low. With independent CPU control, you can write a unique IP address when writing a program, so that when communicating with the main control charger, etc., it will automatically send its own IP address, and the main control program does not need to know when the module is charging or discharging. Where is the battery pack, as long as it is based on the communication data, it can automatically determine and issue commands to let the "discharging module" execute various commands.

Several different commands can be written to the "discharge module" in advance, such as: PWM discharge, return of battery voltage sampling results, return of temperature measurement, constant current discharge, etc. Control systems such as chargers can achieve the purpose of the command as long as they pass the corresponding detection data and make different commands comprehensively.

Only one discharge switch K1 is used, which can be made into PWM discharge or constant current discharge, which is completed by the software of the CPU. There are only three wires connected to the charger

The communication lines between the "discharge modules" can be directly connected to the communication line of the external general control, because the "discharge modules" are independent and only execute according to the order, so there is no need for communication between the "discharge modules". It is just an executive element, an executive element that can communicate with software.

First send the handshake protocol to the "discharging module", which can be sent multiple times in a row. The purpose is to let the "discharging module" start the auxiliary power supply first, because the auxiliary power supply of the "discharging module" will only work when the communication line generates a CLK signal, so " The discharge module is in the energy-saving state, the handshake agreement is acceptable, and the charger knows the IP address of the "discharge module", which is convenient for the next step of control. Of course, it is also possible to debug the cooperation between the charger and the Write to the charger.

Before charging, first check the voltage and temperature of the single battery, and record the ambient temperature and initial voltage of the battery in the control system of the charger.

Start the charging power output of the charger to charge the battery pack in series. At the same time, the voltage and temperature of the single battery are continuously detected and calculated. module" to send a pulse discharge command to this single battery until all the single batteries can reach this set value, and record all the command execution time, and the system calculates the charging capacity of the single battery (actual charging current and time product), and then start the charger pulse charging and the negative pulse discharge of the "discharge module" according to the capacity difference of the single battery to repair the battery pack positively and negatively.

The discharge current of the "discharge module" is determined by detecting the temperature of the battery (the actual working temperature of the battery). It can be PWM discharge or constant current discharge. If the temperature of the single battery is too high and reaches the alarm setting temperature value, it should Stop charging to protect the battery.

The beneficial effects of the utility model are mainly manifested in that the structure is simplified, the cost is reduced, and the applicability is good.

Description of drawings

Figure 1 is a functional block diagram of the battery equalization charging control system.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

Referring to Fig. 1 , a battery equalization charging control system includes a charging positive pole and a charging negative pole, and the charging positive pole and the charging negative pole are respectively connected to multiple groups of single batteries connected in series, and the control system also includes a discharge module and a CPU controller, The discharge module includes a discharge switch control unit and a discharge switch K1. Each single battery is connected in parallel with a discharge switch K1. The discharge switch control unit is connected to the CPU controller, and the CPU controller is provided with a single battery and a charging switch. Each communication line is connected to a first-line communication line; the discharge module also includes a battery voltage detection unit, and the battery voltage detection unit is connected to a voltage detection branch, and the voltage detection branch includes a resistor R1 and resistor R2, the voltage detection branch is connected in parallel with the single battery, the connection node of the resistors R1 and R2 is connected to the battery voltage detection unit; the one-line communication line is connected to a charger, and the charger is used for A voltage parameter calculation unit that calculates the real-time voltage parameters of each single battery according to the data of the battery voltage detection unit; it is used to send a pulse discharge command to the discharge switch when the voltage of a certain single battery is higher than the preset voltage value, and until A discharge real-time control module that sends out a charging completion status indication when the voltage of all single cells is higher than a preset voltage value.

The discharge module also includes a temperature detection unit, a temperature sensor is installed on the single battery, and the temperature sensor is connected to the temperature detection unit; A working temperature calculation unit for temperature; a temperature real-time monitoring module for determining the magnitude of the discharge current according to the current temperature of a single battery.

The charger also includes: a power-on ambient temperature calculation unit for storing the temperature of each single battery when power is on.

The charger also includes: an energy-saving control unit for sending a handshake protocol to the discharge module and starting the auxiliary power supply through a clock signal.

The charger also includes: used to calculate the charging capacity of the single battery: the capacity is equal to the product of the actual charging current and time, and then starts the pulse charging of the charger and the negative pulse discharge of the "discharge module" according to the capacity difference of the single battery. Repair control unit for positive and negative repairs.

The discharge switch K1 is connected in series with the current limiting resistor RS.

In this embodiment, the "discharge module" only uses one discharge switch, and the "discharge module" shares a communication line. The "discharge module" can be made into various functions by software, and there is no need to communicate with each other. The functions can be continuously upgraded according to the hardware. .

The AD detection function attached to the "discharge module" can detect temperature and battery voltage. This is required by the principle of equalization charging, and it is also a common knowledge, but we try to use a cheap CPU to complete it. The battery current does not need to be detected, because the whole group of batteries is connected in series, and the charging and discharging currents of all the battery groups in the series circuit are the same. You can use the cheap multi-function CPU's built-in or external AD detection and temperature detection.

The CPU power supply of the "discharge module", in order to save energy, can be made to have an auxiliary power supply only when the communication has a CLK signal, so that the power of the battery pack can not be consumed when the system is not working.

The "discharge module" discharges during charging to achieve the purpose of balanced charging. At the same time, it can also cooperate with the charger to make positive and negative pulse charging to remove the function of battery vulcanization.

Because the batteries are only lagging behind, some batteries have some quality problems during production and cannot be balanced by charging. At this time, the detection function of the "discharge module" automatically prompts the user through the external control system that a certain battery in the battery pack has a single lagging problem. , cannot be repaired, let the user replace it in time to ensure that other good batteries are no longer damaged due to over-discharge or over-charge. If an LED display is configured in the "discharge module", it can clearly tell the user which battery is faulty , or by displaying the IP address corresponding to the "discharging module" in the control system of the charger, it can also accurately tell the user which battery is faulty

Through the communication data at different times, the ambient temperature and working temperature of the battery can be calculated, and the capacity difference of the battery can also be calculated, and the pulse modification time at different times can be made to ensure that the battery charging is balanced and consistent. At the same time, different single batteries can be different. Desulfurization repair operation.

Claims (6)

1. storage battery equalizing charge control system; Comprise the anodal and charging negative pole of charging; Said charging is anodal to be connected with many groups cell of series connection respectively with the charging negative pole, and it is characterized in that: said control system also comprises discharge module and cpu controller, and said discharge module comprises discharge switch control unit and discharge switch; Each cell is parallelly connected with a discharge switch; The said cpu controller of said discharge switch control unit connects, and said cpu controller is provided with single and the connection charger transfer of data, and every connection all is connected with Integrated Service Digital Network news line; Said discharge module also comprises the battery voltage detection unit; Said battery voltage detection unit is connected with the voltage detecting branch road; Said voltage detecting branch road comprises resistance R 1 and resistance R 2; Said voltage detecting branch road is parallelly connected with cell, and the connected node of said resistance R 1 and R2 is connected with said battery voltage detection unit; Said Integrated Service Digital Network news line is connected with charger, and said charger is in order to the voltage parameter computing unit according to the real-time voltage parameter of each cell of data computation of battery voltage detection unit; Send the pulsed discharge instruction to discharge switch when being higher than the predeterminated voltage value, and when the voltage of all cells all is higher than the predeterminated voltage value, send the real-time control module of discharge of charging completion status indication in order to voltage when a certain cell.

2. storage battery equalizing charge control system as claimed in claim 1, it is characterized in that: said discharge module also comprises temperature detecting unit, mounting temperature sensor on the cell, said temperature sensor is connected with temperature detecting unit; Said charger comprises: in order to the working temperature computing unit according to the real-time working temperature of each monomer of data computation of temperature detecting unit; In order to confirm the temperature real-time monitoring module of the size of discharging current according to the Current Temperatures of a certain cell.

3. according to claim 1 or claim 2 storage battery equalizing charge control system, it is characterized in that: said charger also comprises: the ambient temperature computing unit that powers on of the temperature of each cell when powering in order to preservation.

4. according to claim 1 or claim 2 storage battery equalizing charge control system, it is characterized in that: said charger also comprises: in order to send Handshake Protocol to discharge module, through the Energy Saving Control unit of clock start signal accessory power supply.

5. according to claim 1 or claim 2 storage battery balanced discharge control system; It is characterized in that: said charger also comprises: in order to calculate the capacity of cell charging: capacity equals the long-pending of actual charge current and time, starts the reparation control unit that the negative pulse of charger pulse current charge and discharge module is discharged and carried out positive and negative reparation according to the capacity difference of cell then.

6. according to claim 1 or claim 2 storage battery balanced discharge control system, it is characterized in that: said discharge switch is connected with current-limiting resistance.

Images