CN108233472A - A kind of quick pulse charge method - Google Patents

Abstract

The invention relates to a fast pulse charging method, which solves the technical problem of fixed charging pulse parameters. By adopting step 1, start charging, detect the initial state of the battery, and detect battery parameters; step 2, calculate the initial charging according to the detection result of step 1 Pulse parameters; step 3, real-time detection of battery parameters, real-time calculation of battery charge, and update charging pulse parameters; step 4, real-time charging of the battery according to the charging pulse parameters updated in step 3; step 5, repeat step 3‑step 4. The technical solution until the charging is completed can better solve this problem and can be used in a vehicle-mounted power battery charger.

Description

A fast pulse charging method

technical field

The invention relates to the technical field of battery charging, in particular to a fast pulse charging method.

Background technique

At present, the vehicle power battery charger can be roughly divided into two categories: continuous current charging and pulse current charging. The discharge capacity of continuous current charging is limited by the battery's acceptance capacity and the resistance of the gas generated by the polarization of the battery during the charging process, so that in the case of high current charging, the battery discharge capacity decreases and the battery heats up; if charging with a small current , can overcome this shortcoming, but the charging time is too long. Using the pulse current charging method can improve the battery's acceptance capacity and eliminate the polarization effect, and can shorten the charging time, increase the discharge capacity, reduce the heat generation of the battery, and improve the charging efficiency.

However, the charging pulse width and intermittent time of the current pulse charger are fixed, and the charging and discharging time parameters are not changed according to the charging state and the requirements for fast charging are not changed, so the charging effect is affected. Therefore, it is necessary to provide a fast pulse charging method that changes charging and discharging time parameters according to the charging state and adapts to fast charging.

Contents of the invention

The technical problem to be solved by the present invention is the technical problem of fixed charging pulse parameters existing in the prior art. A new fast pulse charging method is provided, and the fast pulse charging method has the characteristics of variable charging pulse parameters, higher efficiency and faster speed.

In order to solve the above technical problems, the technical scheme adopted is as follows:

A fast pulse charging method comprising:

Step 1, start charging, detect the initial state of the battery, and detect battery parameters;

Step 2, calculating initial charging pulse parameters according to the detection results of step 1;

Step 3, real-time detection of battery parameters, real-time calculation of battery charge, and updating of charging pulse parameters;

Step 4, charging the battery in real time according to the charging pulse parameters updated in step 3;

Step 5, repeat steps 3-4 until charging is complete.

Working principle of the present invention: the present invention firstly determines the initial state of the charged battery, calculates and sets the initial charging parameters according to its state; secondly, detects each state parameter of the charged battery in real time during the charging process, and calculates a new one according to the real-time state parameters The best charging parameters suitable for the battery state at that time are charged until the battery is fully charged. When the temperature of the battery to be charged exceeds the limit value, the relevant charging parameters and time are also adjusted, and the charging control strategy is changed for charging, which can adapt to fast charging.

In the above solution, for optimization, further, the battery parameters are the voltage value, current value and temperature value of the battery.

Further, the calculation of the initial pulse parameters and the update of the charging pulse parameters is to calculate the charge amount of the battery according to the battery voltage value, current value and temperature value, and calculate the charging pulse parameters according to the charge amount, and the charging pulse parameters include the amplitude of the charging positive pulse, Width, the amplitude and width of the charging negative pulse, and the ratio of the charging positive pulse amplitude to the charging negative pulse amplitude.

The charging method with negative pulse discharge can improve the charging acceptance capacity of the power battery of electric vehicles by adding a negative pulse with a certain amplitude and duration after timely suspending charging during the charging process, so that the acceptable charging current curve of the battery can be right. Therefore, it can be charged with a current larger than the acceptable charging current of the battery, which is more efficient and faster than the intermittent pulse charging method.

Further, the updating of the charging pulse parameters includes:

Step a, pre-test and define the total charge capacity of the battery in full state, determine the real-time charge capacity and total charge capacity of the battery in step 3, if the real-time charge capacity is equal to the total charge capacity, stop charging, and the real-time charge capacity is less than the total charge capacity Then execute step b;

Step b, set the temperature limit value in advance, determine the real-time temperature value detected in real time, if the real-time temperature value is greater than the temperature limit value, then suspend charging, perform step 3, if the real-time temperature value is less than the temperature limit value, then perform step c;

Step c, pre-set the charging voltage limit value, determine the real-time detected voltage value and the charging voltage limit value, if the real-time detected voltage value is greater than the charging voltage limit value, then suspend charging, and perform step 3, if the real-time detected voltage value is less than the charging voltage limit value The voltage limit value is then calculated to update the required charging pulse parameters.

When the battery temperature exceeds the limit, it has the ability to adjust the charging control strategy, stop and restart the charger for charging.

Further, the step c also includes: judging the real-time charge and full charge of the battery, if the real-time charge is less than 50% of the full charge, then adjust the amplitude and width of the charging positive pulse;

If the real-time charge is greater than 50% of the full charge and less than 75%, adjust the amplitude and width of the positive charging pulse, the amplitude and width of the negative charging pulse, and the ratio of the positive charging pulse amplitude to the negative charging pulse amplitude;

If the hourly charge is greater than 75% of the full charge, then adjust the amplitude and width of the charging negative pulse.

Further, the step a also includes determining whether the charging switch of the battery is valid, if the charging switch is valid, stop charging, and if the charging switch is invalid, perform step b.

Beneficial effects of the present invention:

The charging method with negative pulse discharge can improve the charging acceptance capacity of the power battery of electric vehicles by adding a negative pulse with a certain amplitude and duration after timely suspending charging during the charging process, so that the acceptable charging current curve of the battery can be right. Therefore, it can be charged with a current larger than the acceptable charging current of the battery, which is more efficient and faster than the intermittent pulse charging method;

When the battery temperature exceeds the limit, it has the ability to adjust the charging control strategy, stop and restart the charger for charging.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Figure 1. Schematic diagram of the fast pulse charging method.

Detailed ways

In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

Example 1

The present embodiment provides that the present invention is a method of fast pulse charging with negative pulse discharge, as shown in Figure 1, the method includes the following steps:

a) In the charger, set the initial positive and negative pulse amplitude, width, and the calculation method for determining the ratio of the positive and negative pulses in a charging cycle. According to the initial value of the positive and negative pulses, the initial state detection data of the battery can be used , calculate its appropriate value by method;

b) Use voltage, current and temperature detection devices to detect the state of the battery in real time, and send all detection information to the charger control system. The control system calculates the real-time state of charge of the battery through all detection information, and adjusts charging according to the detection information and calculation results The amplitude, width and ratio between the positive and negative pulses;

c) When the remaining charge of the battery is below 50% and the charging voltage reaches the limit value, the amplitude and pulse width of the new positive pulse are calculated, and the charger controller issues an instruction to adjust;

d) When the remaining charge of the battery is between 50% and 75%, and the charging voltage reaches the limit value, the proportional relationship between the new positive pulse and negative pulse in one charging cycle is calculated by algorithm, and is controlled by the charger The device issues instructions to adjust;

e) When the remaining charge of the battery exceeds 75% and the charging voltage reaches the limit value, calculate the new amplitude and pulse width of the negative pulse, and adjust it by issuing instructions from the charger controller;

f) When the battery temperature exceeds the limit value, the charging is suspended, and the suspension time is estimated by all the real-time state detection values of the battery, and the new positive and negative pulse amplitude, width and proportional relationship in a charging cycle are calculated; after that, re- Start charging; when the temperature exceeds the limit again, repeat the above steps until the battery is fully charged. When the battery is full, or when the forced stop charging switch is activated, stop charging.

Although the illustrative specific embodiments of the present invention have been described above, so that those skilled in the art can understand the present invention, the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as each As long as the changes are within the spirit and scope of the present invention defined and determined by the appended claims, all inventions and creations utilizing the concept of the present invention are included in the protection list.

Claims (6)

1. A fast pulse charging method, characterized in that: the fast pulse charging method comprises: Step 1, start charging, detect the initial state of the battery, and detect battery parameters; Step 2, calculating initial charging pulse parameters according to the detection results of step 1; Step 3, real-time detection of battery parameters, real-time calculation of battery charge, and updating of charging pulse parameters; Step 4, charging the battery in real time according to the charging pulse parameters updated in step 3; Step 5, repeat steps 3-4 until charging is complete. 2. The fast pulse charging method according to claim 1, characterized in that: said battery parameters are the voltage value, current value and temperature value of the battery. 3. The fast pulse charging method according to claim 2, characterized in that: said calculating the initial pulse parameters and updating the charging pulse parameters is to calculate the charging capacity of the battery according to the battery voltage value, current value and temperature value, and calculate the charging capacity according to the charging capacity Charging pulse parameters. The charging pulse parameters include the amplitude and width of the positive charging pulse, the amplitude and width of the negative charging pulse, and the ratio of the amplitude of the positive charging pulse to the amplitude of the negative charging pulse. 4. The fast pulse charging method according to claim 3, wherein said updating the charging pulse parameters comprises: Step a, pre-test and define the total charge capacity of the battery in full state, determine the real-time charge capacity and total charge capacity of the battery in step 3, if the real-time charge capacity is equal to the total charge capacity, stop charging, and the real-time charge capacity is less than the total charge capacity Then execute step b; Step b, set the temperature limit value in advance, determine the real-time temperature value detected in real time, if the real-time temperature value is greater than the temperature limit value, then suspend charging, perform step 3, if the real-time temperature value is less than the temperature limit value, then perform step c; Step c, pre-set the charging voltage limit value, determine the real-time detected voltage value and the charging voltage limit value, if the real-time detected voltage value is greater than the charging voltage limit value, then suspend charging, and perform step 3, if the real-time detected voltage value is less than the charging voltage limit value The voltage limit value is then calculated to update the required charging pulse parameters. 5. The fast pulse charging method according to claim 4, characterized in that: said step c further comprises: judging the real-time charge and full charge of the battery, if the real-time charge is less than 50% of the full charge, then adjust the charging normal Pulse amplitude and width; If the real-time charge is greater than 50% of the full charge and less than 75%, adjust the amplitude and width of the positive charging pulse, the amplitude and width of the negative charging pulse, and the ratio of the positive charging pulse amplitude to the negative charging pulse amplitude; If the hourly charge is greater than 75% of the full charge, then adjust the amplitude and width of the charging negative pulse. 6. The fast pulse charging method according to claim 4, wherein the step a further includes determining whether the charging switch of the battery is valid, stopping charging if the charging switch is valid, and performing step b if the charging switch is invalid.