CN103107378B - The method for charging batteries of a kind of mobile terminal and device mobile terminal - Google Patents

Abstract

The invention relates to the field of electronic consumption, in particular to a battery charging method and device for a mobile terminal and the mobile terminal. The method includes the following steps: charging the battery with a constant current; obtaining the current internal resistance of the battery; obtaining the current charging cut-off voltage from the current battery internal resistance; judging whether the current battery voltage is greater than or equal to the current charging cut-off voltage , if not, return to the above steps to obtain the current internal resistance of the battery; if yes, use a constant voltage to charge the battery. In the present invention, the mobile terminal charging cut-off voltage of the mobile terminal is adjusted by compensating the voltage consumed by the internal resistance of the battery to increase the charging time in the constant current stage so as to achieve the purpose of fast charging without increasing the cost and increasing the charging speed, especially for large The effect of the current charging battery is more significant, which better improves the user experience.

Description

Battery charging method and device for mobile terminal

technical field

The invention relates to the field of electronic consumption, in particular to a method for charging a battery of a mobile terminal and a mobile terminal device.

Background technique

The battery internal resistance of the mobile terminal includes the internal resistance of the battery line, the ohmic internal resistance of the battery cell, and the polarization internal resistance of the battery cell. In the process of charging consumer electronic products such as mobile terminals, the battery charging of mobile terminals generally does not consider the voltage division of the internal resistance of the battery, which causes the cell voltage of the battery of the mobile terminal to not reach the charging cut-off of the battery during the constant current charging stage. The voltage battery is converted to constant voltage charging. After the conversion to constant voltage charging, the constant voltage charging current will gradually decrease, resulting in a much slower charging rate. The internal resistance of the battery in the current solution has a greater impact on the improvement of the charging speed. hinder.

Contents of the invention

The main purpose of the present invention is to provide a battery charging method for a mobile terminal, which aims to solve the problem that the internal resistance of the battery has a relatively large obstacle to the improvement of the charging speed in the existing solution.

The present invention is achieved in that a battery charging method of a mobile terminal comprises the following steps:

Charge the battery with a constant current;

Measure the internal resistance of the current battery;

The current charging cut-off voltage is obtained from the current internal resistance of the battery;

It is judged whether the current battery voltage is greater than or equal to the current charging cut-off voltage, and if so, the battery is charged with a constant voltage.

Another object of the present invention is to provide a battery charging device for a mobile terminal, the battery charging device for the mobile terminal comprising:

A constant current charging module, used to charge the battery with a constant current;

The battery internal resistance module is used to obtain the internal resistance of the current battery;

The charging cut-off voltage module is used to obtain the current charging cut-off voltage from the current internal resistance of the battery;

The battery voltage judging module is used to judge whether the current battery voltage is greater than or equal to the current charging cut-off voltage, and if so, enter the next module;

The constant voltage charging module is used to charge the battery with a constant voltage.

In the present invention, the mobile terminal charging cut-off voltage of the mobile terminal is adjusted by compensating the voltage consumed by the internal resistance of the battery of the mobile terminal, so as to increase the charging time in the constant current stage to achieve the purpose of fast charging, without increasing the cost and increasing the charging speed. Especially for high-current rechargeable batteries, the effect is more significant, and the user experience is better improved.

Description of drawings

FIG. 1 is a flow chart of a battery charging method for a mobile terminal provided by an embodiment of the present invention;

Fig. 2 is a flow chart of obtaining the current internal resistance of the battery through the steps provided by the embodiment of the present invention;

Fig. 3 is a flow chart of obtaining the current charging cut-off voltage from the current battery internal resistance according to the steps provided by the embodiment of the present invention;

4 is a structural diagram of a battery charging device for a mobile terminal provided by an embodiment of the present invention;

Fig. 5 is a structural diagram of a battery internal resistance module provided by an embodiment of the present invention;

Fig. 6 is a structural diagram of a battery charging device for a mobile terminal provided by an embodiment of the present invention.

detailed description

In order to make the purpose, principle and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

In the present invention, the charging cut-off voltage of the mobile terminal is adjusted by compensating the voltage consumed by the internal resistance of the battery, so as to increase the charging time in the constant current stage and thus charge the battery quickly.

FIG. 1 shows the flow of a method for charging a battery of a mobile terminal provided by an embodiment of the present invention. For convenience of description, only parts related to the present invention are shown, and the details are as follows.

The present invention is achieved in that a battery charging method of a mobile terminal comprises the following steps:

In step S100, the battery is charged with a constant current;

In step S200, measure the internal resistance of the current battery;

In step S300, the current charging cut-off voltage is obtained from the current internal resistance of the battery;

In step S400, it is judged whether the current battery voltage is greater than or equal to the current charging cut-off voltage, if not, return to the step S200 to obtain the current internal resistance of the battery, and if yes, enter the next step;

In step S500, the battery is charged with a constant voltage.

In the present invention, there is a parameter in the battery specifications called charge cut-off voltage, which reflects the inherent characteristics of a material system. For example, the charge cut-off voltage of a lithium-cobalt battery is 4.2V. The current high-voltage system battery charging The cut-off voltage is 4.35V. Because the battery itself has internal resistance, internal resistance includes ohmic internal resistance and polarization internal resistance, due to the existence of internal resistance, the battery cell begins to switch to constant voltage charging before reaching the charging cut-off voltage, and the current of the battery in the constant voltage charging stage is small , and as time goes on, the current will become smaller and smaller, and the charge will be slower in the constant voltage stage. Therefore, in order to improve the charging speed of the battery, the constant current charging time should be extended to meet the requirements.

FIG. 2 shows the process of obtaining the current internal resistance of the battery in step S200 provided by the embodiment of the present invention. For the convenience of description, only the parts related to the present invention are shown, and the details are as follows.

As an embodiment of the present invention, the step S200 obtains the current internal resistance of the battery as follows:

In step S201, a battery internal resistance table corresponding to the battery temperature is established;

In step S202, sampling the current battery temperature;

In step S203, the battery internal resistance table is checked according to the sampled battery temperature to obtain the current internal resistance of the battery.

As an embodiment of the present invention, the sampling of the battery temperature is performed by an analog-to-digital converter.

Fig. 3 shows the process of obtaining the current charging cut-off voltage from the current internal resistance of the battery in step S300 provided by the embodiment of the present invention. For the convenience of illustration, only the parts related to the present invention are shown, and the details are as follows.

As an embodiment of the present invention, the step S300 obtains the current charging cut-off voltage from the current internal resistance of the battery as follows:

In step S301, sampling the current charging current;

In step S302, the current internal resistance of the battery and the current charging current are substituted into the formula: V01=V0+I×r to obtain the current charging cut-off voltage, where V01 is the current charging cut-off voltage, and V0 is the preset charging cut-off voltage , I is the current charging current, r is the current internal resistance of the battery.

As an embodiment of the present invention, the charging current is sampled using an analog-to-digital converter.

Those of ordinary skill in the art can understand that all or part of the steps in the method of the above-mentioned embodiments can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, and the storage Media such as ROM/RAM, magnetic disk, optical disk, etc.

FIG. 4 shows the structure of a battery charging device for a mobile terminal provided by an embodiment of the present invention. For ease of description, only parts related to the present invention are shown, and details are as follows.

Another object of the present invention is to provide a battery charging device for a mobile terminal, comprising:

The constant current charging module 100 is used to charge the battery with a constant current;

A battery internal resistance module 200, configured to obtain the current internal resistance of the battery;

The charging cut-off voltage module 300 is used to obtain the current charging cut-off voltage from the current internal resistance of the battery;

The battery voltage judging module 400 is used to judge whether the current battery voltage is greater than or equal to the current charging cut-off voltage, if not, return to the battery internal resistance module 200, and if yes, enter the next module;

The constant voltage charging module 500 is used to charge the battery with a constant voltage.

Fig. 5 shows the structure of the battery internal resistance module 200 provided by the embodiment of the present invention. For the convenience of description, only the parts related to the present invention are shown, and the details are as follows.

As an embodiment of the present invention, the battery internal resistance module 200 includes:

A battery internal resistance table establishing unit 201, configured to establish a battery internal resistance table corresponding to the battery temperature;

A battery temperature sampling unit 202, configured to sample the current battery temperature;

The battery internal resistance table lookup unit 203 is used to check the battery internal resistance table according to the sampled battery temperature to obtain the current battery internal resistance.

FIG. 6 shows the structure of the charging cut-off voltage module 300 provided by the embodiment of the present invention. For the convenience of description, only the parts related to the present invention are shown, and the details are as follows.

As an embodiment of the present invention, the charging cut-off voltage module 300 includes:

A charging current sampling unit 301, configured to sample the current charging current;

The charging cut-off voltage calculation unit 302 is used for substituting the current battery internal resistance and the current charging current into the formula: V01=V0+I×r to obtain the current charging cut-off voltage, wherein V01 is the current charging cut-off voltage, and V0 is the preset The charging cut-off voltage, I is the current charging current, and r is the current internal resistance of the battery.

In the present invention, the mobile terminal charging cut-off voltage of the mobile terminal is adjusted by compensating the voltage consumed by the internal resistance of the battery to increase the charging time in the constant current stage so as to achieve the purpose of fast charging without increasing the cost and increasing the charging speed, especially for large The effect of current charging battery is more significant, which better improves the user experience.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (2)

1. A battery charging method for a mobile terminal, characterized in that said method comprises the steps of: Charge the battery with a constant current; Measure the internal resistance of the current battery; The current charging cut-off voltage is obtained from the current internal resistance of the battery; Determine whether the current battery voltage is greater than or equal to the current charging cut-off voltage, and use a constant voltage to charge the battery; The steps to obtain the internal resistance of the current battery are specifically: Establish a battery internal resistance table corresponding to the battery temperature; Sample the current battery temperature; According to the sampled battery temperature, check the battery internal resistance meter to obtain the current battery internal resistance; According to the steps, the current charging cut-off voltage is obtained from the current internal resistance of the battery as follows: Sample the current charging current; Substitute the current internal resistance of the battery and the current charging current into the formula: V01=V0+I×r to get the current charging cut-off voltage, where V01 is the current charging cut-off voltage, V0 is the preset charging cut-off voltage, and I is the current charging cut-off voltage. Charging current, r is the current internal resistance of the battery; The step judges whether the current battery voltage is greater than or equal to the current charging cut-off voltage, and if not, returns to the step of obtaining the current internal resistance of the battery. 2. A battery charging device for a mobile terminal, characterized in that the battery charging device for the mobile terminal comprises: A constant current charging module, used to charge the battery with a constant current; The battery internal resistance module is used to measure the internal resistance of the current battery; The charging cut-off voltage module is used to obtain the current charging cut-off voltage from the current internal resistance of the battery; The battery voltage judging module is used to judge whether the current battery voltage is greater than or equal to the current charging cut-off voltage, and if so, enter the constant voltage charging module; A constant voltage charging module, used to charge the battery with a constant voltage; The battery internal resistance module includes: A battery internal resistance meter establishment unit, used to establish a battery internal resistance table corresponding to the battery temperature; The battery temperature sampling unit is used to sample the current battery temperature; The battery internal resistance look-up unit is used to check the battery internal resistance table according to the sampled battery temperature to obtain the current battery internal resistance; The charging cut-off voltage module includes: The charging current sampling unit is used to sample the current charging current; The charging cut-off voltage calculation unit is used to substitute the current internal resistance of the battery and the current charging current into the formula: V01=V0+I×r to obtain the current charging cut-off voltage, wherein V01 is the current charging cut-off voltage, and V0 is the preset Charging cut-off voltage, I is the current charging current, r is the current internal resistance of the battery; The battery voltage judging module judges whether the current battery voltage is greater than or equal to the current charging cut-off voltage, and returns to the battery internal resistance module if not.