Battery charging method and device

Abstract

The present disclosure is about a battery charging method and device, and relates to livestock battery charging technology. A battery charging method disclosed herein includes: performing a first-stage charging on a battery, wherein constant current charging starts when the charging voltage of the battery reaches a first voltage value, and the first-stage charging ends when the charging current of the battery reaches a first current value; performing a second-stage charging on the battery according to a preset constant current charging method until the charging voltage of the battery is increased to a maximum charging voltage value; performing a third-stage charging on the battery according to a constant voltage charging method until the charging current value of the battery reaches a charging termination current value corresponding to the maximum charging voltage value, and then stopping charging, wherein the charging voltage of the constant voltage charging in the third stage is greater than or equal to the rated voltage of the battery. The technical solution of the present application effectively prolongs the constant current charging time, reduces the capacity replenishment time in the constant voltage stage, and reduces the full charging time of the battery.

Description

Technical Field

[0001] The present disclosure relates to livestock battery charging technology, and more particularly to a battery charging method and device. Background Art

[0002] In the related art, the lithium-ion battery charging scheme generally adopts a single-stage or multi-stage constant current and constant voltage charging method. That is, first charge with a constant current. When the voltage reaches a predetermined value, it switches to constant voltage charging, and the current gradually decreases. When the charging current drops to near zero, the battery is fully charged. Among them, the main function of constant voltage charging is to offset the polarization effect of the lithium-ion battery system caused by high current charging during constant current charging, and at the same time add more capacity. However, the constant voltage charging time is often about twice the constant current charging time.

[0003] With the development of lithium-ion battery applications, especially in electric vehicles and smartphones, users have an increasingly urgent need for fast charging. However, due to the limitations of the lithium-ion battery system, performance improvements are difficult to match customer expectations. Summary of the invention

[0004] In order to overcome the problems existing in the related art, the present disclosure provides a battery charging method and device.

[0005] According to a first aspect of an embodiment of the present disclosure, there is provided a battery charging method, comprising:

[0006] Determining a maximum charging voltage value that a battery can withstand, wherein the maximum charging voltage value is greater than a rated voltage of the battery;

[0007] The battery is charged in the first stage in a constant current and constant voltage manner, wherein constant current charging starts when the charging voltage of the battery reaches a first voltage value, and the first stage charging ends when the charging current of the battery reaches a first current value, the first voltage value is less than or equal to the rated voltage value of the battery, and the first current value is greater than the charging termination current value corresponding to the rated voltage of the battery;

[0008] The battery is charged in the second stage according to a preset constant current charging method until the charging voltage of the battery is increased to a maximum charging voltage value, and the second stage charging is terminated;

[0009] The battery is charged in the third stage according to the constant voltage charging method until the charging current value of the battery reaches the charging termination current value corresponding to the maximum charging voltage value, and the charging is stopped, wherein the charging voltage of the constant voltage charging in the third stage is greater than or equal to the rated voltage of the battery.

[0010] Optionally, in the above method, determining the maximum charging voltage value that the battery can withstand includes:

[0011] Determine the maximum working voltage V1 of the electrolyte of the battery, the critical voltage V2 of the continuous reaction between the positive electrode material of the battery and the electrolyte, and the critical voltage of the continuous reaction between the negative electrode material of the battery and the electrolyte according to the three-electrode system cyclic voltammetry test method;

[0012] The maximum charging voltage value is determined according to V1, V2 and V3, wherein the maximum charging voltage value is the smaller value of the following two:

[0013] The difference between V1, V2 and V3.

[0014] Optionally, in the above method, charging the battery in the second stage according to a preset constant current charging method includes:

[0015] When the preset constant current charging mode includes a timed charging mode, the battery is charged with constant current according to a second current value, and when the duration of the constant current charging reaches a set duration corresponding to the preset constant current charging mode, the charging voltage of the battery is determined, wherein the second current value is less than the first current value;

[0016] When the charging voltage of the battery is less than the maximum charging voltage value, the battery is again charged with constant current according to the preset constant current charging mode;

[0017] When the charging voltage of the battery is equal to the maximum charging voltage value, the second stage charging is ended.

[0018] Optionally, the above method further includes:

[0019] During the second stage of charging, the battery is charged at a constant voltage, wherein when it is determined that the charging voltage of the battery is less than the maximum charging voltage value, constant voltage charging is performed before the battery is charged at a constant current again according to the preset constant current charging method.

[0020] Optionally, the above method further includes:

[0021] During the second stage charging process, the battery is discharged, wherein when it is determined that the charging voltage of the battery is less than the maximum charging voltage value, the battery is discharged before being charged again with constant current according to the preset constant current charging method.

[0022] Optionally, in the above method, charging the battery in the third stage according to the constant voltage charging method includes:

[0023] Performing constant voltage charging on the battery according to the maximum charging voltage value; or

[0024] The battery is firstly discharged, and then charged at a constant voltage.

[0025] According to a second aspect of an embodiment of the present disclosure, there is provided a battery charging device, comprising:

[0026] A determination module, used to determine a maximum charging voltage value that a battery can withstand, wherein the maximum charging voltage value is greater than a rated voltage of the battery;

[0027] A first charging module, used for performing a first-stage charging of the battery in a constant current and constant voltage manner, wherein constant current charging starts when the charging voltage of the battery reaches a first voltage value, and the first-stage charging ends when the charging current of the battery reaches a first current value, the first voltage value is less than or equal to the rated voltage value of the battery, and the first current value is greater than the charging termination current value corresponding to the rated voltage of the battery;

[0028] A second charging module is used to charge the battery in the second stage according to a preset constant current charging method until the charging voltage of the battery is increased to a maximum charging voltage value, and then the second stage charging is terminated;

[0029] The third charging module is used to perform third-stage charging of the battery in a constant voltage charging manner until the charging current value of the battery reaches a charging termination current value corresponding to the maximum charging voltage value, and then stop charging, wherein the charging voltage of the constant voltage charging in the third stage is greater than or equal to the rated voltage of the battery.

[0030] Optionally, in the above device, the determining module includes:

[0031] The first submodule is used to determine the maximum working voltage V1 of the electrolyte of the battery, the critical voltage V2 of the continuous reaction between the positive electrode material of the battery and the electrolyte, and the critical voltage of the continuous reaction between the negative electrode material of the battery and the electrolyte according to the three-electrode system cyclic voltammetry test method;

[0032] The second submodule is used to determine the maximum charging voltage value according to V1, V2 and V3, wherein the maximum charging voltage value is the smaller value of the following two:

[0033] The difference between V1, V2 and V3.

[0034] Optionally, in the above device, the second charging module includes:

[0035] A first submodule is used for performing constant current charging on the battery according to a second current value when the preset constant current charging mode includes a timed charging mode, and determining a charging voltage of the battery when the constant current charging duration reaches a set duration corresponding to the preset constant current charging mode, wherein the second current value is less than the first current value;

[0036] A second submodule is used for performing constant current charging on the battery again according to the preset constant current charging mode when the charging voltage of the battery is less than the maximum charging voltage value;

[0037] The third submodule is used to end the second stage charging when the charging voltage of the battery is equal to the maximum charging voltage value.

[0038] Optionally, in the above device, the second charging module further includes:

[0039] The fourth submodule is used to perform constant voltage charging on the battery during the second stage of charging, wherein when it is determined that the charging voltage of the battery is less than the maximum charging voltage value, constant voltage charging is performed before the battery is charged with constant current again according to the preset constant current charging method.

[0040] Optionally, the above device further includes:

[0041] The discharge module is used to perform a discharge operation on the battery during the second stage charging process, wherein when it is determined that the charging voltage of the battery is less than the maximum charging voltage value, the discharge operation is performed before the battery is charged with constant current again according to the preset constant current charging method.

[0042] Optionally, in the above device, the third charging module includes:

[0043] A first submodule is configured to perform constant voltage charging on the battery according to the maximum charging voltage value; or

[0044] The second submodule is used to first discharge the battery and then perform constant voltage charging on the battery.

[0045] According to a third aspect of an embodiment of the present disclosure, there is provided a battery charging device, comprising:

[0046] processor;

[0047] a memory for storing processor-executable instructions;

[0048] Wherein, the processor is configured to:

[0049] Determining a maximum charging voltage value that a battery can withstand, wherein the maximum charging voltage value is greater than a rated voltage of the battery;

[0050] The battery is charged in the first stage in a constant current and constant voltage manner, wherein constant current charging starts when the charging voltage of the battery reaches a first voltage value, and the first stage charging ends when the charging current of the battery reaches a first current value, the first voltage value is less than or equal to the rated voltage value of the battery, and the first current value is greater than the charging termination current value corresponding to the rated voltage of the battery;

[0051] The battery is charged in the second stage according to a preset constant current charging method until the charging voltage of the battery is increased to a maximum charging voltage value, and the second stage charging is terminated;

[0052] The battery is charged in the third stage according to the constant voltage charging method until the charging current value of the battery reaches the charging termination current value corresponding to the maximum charging voltage value, and the charging is stopped, wherein the charging voltage of the constant voltage charging in the third stage is greater than or equal to the rated voltage of the battery.

[0053] According to a fourth aspect of an embodiment of the present disclosure, a non-transitory computer-readable storage medium is provided. When instructions in the storage medium are executed by a processor of a terminal device, the terminal device is enabled to perform a battery charging method, the method comprising:

[0054] Determining a maximum charging voltage value that a battery can withstand, wherein the maximum charging voltage value is greater than a rated voltage of the battery;

[0055] The battery is charged in the first stage in a constant current and constant voltage manner, wherein constant current charging starts when the charging voltage of the battery reaches a first voltage value, and the first stage charging ends when the charging current of the battery reaches a first current value, the first voltage value is less than or equal to the rated voltage value of the battery, and the first current value is greater than the charging termination current value corresponding to the rated voltage of the battery;

[0056] The battery is charged in the second stage according to a preset constant current charging method until the charging voltage of the battery is increased to a maximum charging voltage value, and the second stage charging is terminated;

[0057] The battery is charged in the third stage according to the constant voltage charging method until the charging current value of the battery reaches the charging termination current value corresponding to the maximum charging voltage value, and the charging is stopped, wherein the charging voltage of the constant voltage charging in the third stage is greater than or equal to the rated voltage of the battery.

[0058] The technical solution provided by the embodiments of the present disclosure may have the following beneficial effects:

[0059] The technical solution disclosed in the present invention effectively prolongs the constant current charging time through the overvoltage constant current charging method, reduces the capacity replenishment time in the constant voltage stage, and greatly reduces the full charging time of the battery.

[0060] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0062] Figure 1 The figure is a flow chart of a battery charging method according to an exemplary embodiment.

[0063] Figure 2 The figure is a flow chart of a battery charging method according to an exemplary embodiment.

[0064] Figure 3 It is a schematic diagram of the effect of charging the same battery using the battery charging method shown in this embodiment and the charging method of the related art respectively.

[0065] Figure 4 The invention is a block diagram of a battery charging device according to an exemplary embodiment.

[0066] Figure 5 The invention is a block diagram of a battery charging device according to an exemplary embodiment. DETAILED DESCRIPTION

[0067] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices and methods consistent with some aspects of the present invention as detailed in the appended claims.

[0068] Figure 1 FIG. 1 is a flow chart of a battery charging method according to an exemplary embodiment. Figure 1 As shown, the method includes the following operations:

[0069] In step S101, the maximum charging voltage value that the battery can withstand is determined, and the maximum charging voltage value is greater than the rated voltage of the battery;

[0070] In step S102, the battery is charged in the first stage in a constant current and constant voltage manner, wherein constant current charging is started when the charging voltage of the battery reaches a first voltage value, and constant voltage charging is ended when the charging current of the battery reaches a first current value, the first voltage value is less than or equal to the rated voltage value of the battery, and the first current value is greater than the charging termination current value corresponding to the rated voltage of the battery;

[0071] In step S103, the battery is charged in the second stage according to a preset constant current charging method until the charging voltage of the battery is increased to the maximum charging voltage value, and the second stage charging is terminated;

[0072] In step S104, the battery is charged in the third stage according to the constant voltage charging method until the charging current value of the battery reaches the charging termination current value corresponding to the maximum charging voltage value, and the charging is stopped, wherein the charging voltage of the constant voltage charging in the third stage is greater than or equal to the rated voltage of the battery.

[0073] The maximum charging voltage value of the battery involved in this article can be determined according to the battery system to which the battery belongs. For example, it can be determined according to the highest critical voltage of the electrolyte of the battery system or the reaction between the electrolyte and the positive electrode material.

[0074] The charging termination current value corresponding to the rated voltage of the battery refers to the charging current at the termination of constant current and constant voltage charging according to the rated voltage designed for the battery, which is generally 0.02C.

[0075] The charging termination current value corresponding to the maximum charging voltage value refers to the termination charging current value when the battery is charged at a constant voltage according to the maximum charging voltage value in this article until the battery is close to or reaches a fully charged state. In this embodiment, when the third stage of constant voltage charging reaches the charging termination current value corresponding to the maximum charging voltage value, the actual capacity of the battery is the same as the actual capacity of the battery when the battery is charged at a constant current and constant voltage according to the relevant technology until the battery is fully charged and the charging is stopped.

[0076] In this embodiment, in the first stage of charging the battery in a constant current and constant voltage manner, the current of the constant current charging may be less than or equal to the maximum charging current allowed by the battery. The maximum charging current allowed by the battery may be determined according to the charging rate of the battery. It can be seen from the value range of the first voltage value and the first current value that the first stage of charging belongs to constant current and constant voltage charging within the rated voltage of the battery, and after the first stage of charging, the actual capacity of the battery does not reach the rated capacity of the battery. That is, the battery needs to continue to be charged.

[0077] In the second stage of charging, the preset constant current charging method may include single constant current charging, timed constant current charging, etc., as long as the charging voltage of the battery is increased to the maximum charging voltage value through the preset constant current method. Since the maximum charging voltage value is greater than the rated voltage of the battery, it can be seen that the second stage of charging belongs to the overvoltage constant current charging method. After the second stage of charging, the actual capacity of the battery will be closer to the rated capacity of the battery, that is, the actual capacity of the battery can reach a sub-saturated state.

[0078] In the third stage of charging, constant voltage charging is used to depolarize the battery and achieve a capacity replenishment effect, that is, the actual capacity of the battery can reach a saturated state. Since the charging voltage of the constant voltage charging in the third stage is greater than or equal to the rated voltage of the battery, the constant voltage charging time is relatively short.

[0079] It can be seen that the technical solution of this embodiment effectively prolongs the constant current charging time through the overvoltage constant current charging mode in the second stage, reduces the capacity replenishment time in the constant voltage stage, and thus greatly reduces the full charging time of the battery.

[0080] This embodiment further provides a battery charging method. In the method, determining a maximum charging voltage value that the battery can withstand includes:

[0081] The maximum charging voltage value is determined according to the three-electrode system cyclic voltammetry test method, wherein the maximum charging voltage value is the smaller of the following two values:

[0082] The maximum operating voltage V1 of the battery’s electrolyte;

[0083] The difference between voltage V2 and voltage V3, wherein voltage V2 is the critical voltage for the continuous reaction between the positive electrode material of the battery and the electrolyte, and voltage V3 is the critical voltage for the continuous reaction between the negative electrode material of the battery and the electrolyte.

[0084] As mentioned above, the maximum charging voltage value that a battery can withstand is related to the battery system to which the battery belongs. Therefore, the maximum charging voltage value can be determined according to the three-electrode system cyclic voltammetry test method. And the determined maximum charging voltage value of the battery is what the battery can withstand, that is, when the battery is charged at a constant current according to the maximum charging voltage value, it will not have a negative impact on the battery performance.

[0085] This embodiment further provides a battery charging method, in which the battery is charged in the second stage according to a preset constant current charging method, including:

[0086] When the preset constant current charging mode includes a timed charging mode, the battery is charged with constant current according to a second current value, and when the constant current charging time reaches a set time corresponding to the preset constant current charging mode, the charging voltage of the battery is determined, wherein the second current value is less than the first current value;

[0087] When the charging voltage of the battery is less than the maximum charging voltage value, the battery is charged again with constant current according to the preset constant current charging method;

[0088] When the charging voltage of the battery is equal to the maximum charging voltage value, the second stage charging is ended.

[0089] Among them, when the second current value is less than the first current value, it can ensure that under the overvoltage constant current charging mode, overcharging can be avoided, thereby improving charging safety.

[0090] In this embodiment, during the second stage charging process, when constant current charging is performed according to the set duration, the charging voltage of the battery may be increased to the maximum charging voltage value through one or more constant current charging. It can be seen that the second stage charging process prolongs the constant current charging time. In this way, after the second stage charging, the actual capacity of the battery will be closer to the rated capacity of the battery, that is, the actual capacity of the battery can reach a sub-saturated state. Since the actual capacity of the battery can reach a sub-saturated state, the time for replenishing the capacity through the third stage constant voltage charging can be greatly reduced, thereby greatly reducing the full charging time of the battery.

[0091] This embodiment also provides a battery charging method, the method further comprising:

[0092] During the second stage of charging, the battery is charged at a constant voltage, wherein when it is determined that the charging voltage of the battery is less than the maximum charging voltage value, constant voltage charging is performed before the battery is charged at a constant current again according to a preset constant current charging method.

[0093] Among them, the specific methods of constant voltage charging can include multiple. For example, constant voltage charging can be performed according to a set duration, and when the constant voltage charging reaches the set duration, the constant voltage charging is terminated. For another example, the constant voltage charging of the battery is performed until the charging current drops to a set value, and the constant voltage charging is terminated.

[0094] In the second stage charging process of this embodiment, a constant voltage charging operation is added to achieve a capacity replenishment effect. In this way, when constant current charging is performed after constant voltage charging, more power is actually replenished, thereby improving charging efficiency.

[0095] This embodiment also provides a battery charging method, the method further comprising:

[0096] In the second stage charging process, the battery is discharged. When it is determined that the charging voltage of the battery is less than the maximum charging voltage value, the battery is discharged before being charged with constant current again according to a preset constant current charging method.

[0097] Among them, the specific methods of the discharge operation may include multiple methods. For example, the discharge current may be set to discharge for a set time. For another example, the discharge current may be set to discharge until the charging voltage of the battery drops to a set voltage value. The additional battery discharge operation may depolarize the battery. In this way, when constant current charging is performed after discharge, the charging effect is better.

[0098] This embodiment further provides a battery charging method, in which the battery is charged in the third stage according to a constant voltage charging method, including:

[0099] Perform constant voltage charging on the battery according to the maximum charging voltage value; or

[0100] The battery is first discharged, and then the battery is charged at a constant voltage according to the voltage after the discharge operation.

[0101] Among them, the battery is charged at a constant voltage according to the maximum charging voltage value, which means that after the second stage of charging, the battery can be charged at a constant voltage while maintaining the charging voltage at the maximum charging voltage value to replenish the capacity. In this way, the constant voltage charging time is shorter and the total charging time is also reduced.

[0102] The battery is first discharged, and then the battery is charged at a constant voltage according to the voltage after the discharge operation, which means that the battery can be depolarized by the discharge operation, and then constant voltage charging is performed according to the voltage after the discharge to replenish the capacity. In this way, the actual capacity of the battery after charging is closer to the rated capacity, and the charging effect is better. Among them, the specific methods of the discharge operation can include multiple. For example, the discharge current can be set to discharge for a set time. For another example, the discharge current can be set to discharge until the charging voltage of the battery drops to a set voltage value. The set voltage value is greater than or equal to the rated voltage of the battery. The method of the discharge operation in the third stage charging process can be the same as or different from the method of the discharge operation added in the second stage charging process.

[0103] Figure 2 FIG. 1 is a flow chart of a method for predicting battery information according to an exemplary embodiment. Figure 2 As shown, the following operations are included:

[0104] Step S201: Determine the maximum charging voltage value U that the battery to be charged can withstand over .

[0105] In this step, U can be determined according to the battery system to which the battery to be charged belongs. over For example, the three-electrode cyclic voltammetry test method can be used to confirm the maximum working voltage V1 of the electrolyte used in the battery system, the critical voltage V2 of the battery's positive electrode material and the electrolyte for continuous reaction, and the critical voltage V3 of the battery's negative electrode material and the electrolyte for continuous reaction. over=min{V1,V2-V3}. That is U over The value of is V1, and the smaller value of the difference between V2 and V3.

[0106] Step S202: The battery to be charged is charged in the first stage, wherein constant current charging is first performed according to current I1. When the voltage value of the battery reaches U1, constant voltage charging is started. The first stage of charging is terminated when the charging current of the battery reaches I2.

[0107] In the above step S202, the current I1≤the maximum charging current I allowed by the battery max The maximum charging current allowed by the battery is I max It can be determined according to the charging rate of the battery to be charged. For example, when the charging rate of the battery is 1.5C, the first stage of constant current charging can be performed at 1.5.

[0108] Voltage U1≤Rated voltage U of battery max The rated voltage of the battery is U max It can be determined according to the battery system of the battery to be charged.

[0109] The termination charging current value I corresponding to the rated voltage of the battery end <Current I2. Among them, the termination charging current value I corresponding to the rated voltage of the battery end Refers to the charging current at the end of constant current and constant voltage charging according to the rated voltage designed for the battery, which is generally 0.02C.

[0110] Step S203: discharging the battery.

[0111] The discharge current during the discharge operation can be preset, for example, the discharge operation is performed at a current of 0.5C. The discharge time can be selected within 0 to 50 seconds. After the battery is discharged, it can be better depolarized and the charging efficiency can be improved.

[0112] Step S204: The battery to be charged is charged in the second stage, wherein constant current charging is performed according to current I3. When the voltage value of the battery reaches U2, constant voltage charging is started until the charging current of the battery reaches I4. This constant current and constant voltage charging is repeated for multiple times until the voltage U2 of the battery during constant current charging is equal to U over The second stage of charging is completed.

[0113] Among them, current I3<current I1, U1<U2≤U over .

[0114] In addition, during the second stage of charging, after each constant current and constant voltage charging, a discharge operation can be performed. The discharge current can be preset. For example, the discharge operation is performed at a current of 0.5C. The discharge duration can be selected within 0 to 50 seconds.

[0115] Step S205: Discharge the battery until the battery voltage reaches U end , where U max ≤U end ≤Uover.

[0116] The discharge current in the discharge operation can be preset. For example, the discharge operation is performed at a current of 0.2C. The discharge duration can be selected within 0 to 50 seconds.

[0117] Step S206: According to the voltage U end The battery is charged at a constant voltage in the third stage until the charging current of the battery reaches the charging termination current value I' corresponding to the maximum charging voltage value. end , stop charging.

[0118] In this step, the charging termination current value I' corresponding to the maximum charging voltage value end It may include charging the battery at a constant voltage according to the maximum charging voltage value in this article until the battery is close to or reaches a fully charged state. In this article, the termination charging current value I' end The value can depend on the maximum charging voltage value U allowed by the battery over And the designed battery capacity of the battery system. According to the operation of step S206, when the charging current of the battery reaches I' end The battery capacity after stopping charging is the same as that of the battery charged to I by constant current and constant voltage according to the related art. end The battery capacity is the same after stopping charging.

[0119] The effect of charging the battery according to the above method is compared with the constant current and constant voltage charging method used in the related art. Figure 3 As shown. It can be seen that the technical solution of this article greatly increases the high-current charging time and reduces the constant-voltage capacity replenishment time, thereby reducing the total battery charging time and achieving a true fast charging effect.

[0120] The following takes a battery with a capacity of 3900mAh, a rated voltage of 4.4V, and a battery system whose charging rate meets 1.5C charging as an example to illustrate the charging process according to the charging method in this article.

[0121] First, the maximum charging voltage U that the battery can withstand can be determined by the three-electrode system cyclic voltammetry test method. over =4.6V. Determine Uover The corresponding charge termination current value is 2535mA.

[0122] The procedure for charging this battery is as follows:

[0123] Step A, perform the first stage charging in a constant current and constant voltage manner, wherein, when the battery charging voltage reaches 4.4V at a constant current of 1.5C, constant voltage charging is started at a charging voltage of 4.4V until the battery charging current reaches 1.0C, ending the first stage charging and entering step B.

[0124] Step B, discharge the battery at a discharge current of 1.95 A for 1 second.

[0125] Step C, performing the second stage charging in a constant current charging manner, wherein charging at a constant current of 1.0C until the charging voltage of the battery reaches 4.6V, ending the second stage charging and entering step D.

[0126] Step D: Discharge the battery at a discharge current of 1.95A until the charging voltage of the battery drops to 4.45V.

[0127] Step E, charging the battery in the third stage according to the constant voltage charging method, wherein the third stage of constant voltage charging is performed at a charging voltage of 4.45V to 2535mA, at which time charging is stopped. At this time, the battery capacity is close to 3900mAh, which is the same as the battery capacity when the battery is charged to the termination charging current value according to the constant current and constant voltage charging in the related art.

[0128] In actual testing, when the battery is fully charged according to the above method, the total charging time is about 57 minutes. When the battery is charged to a rated voltage of 4.4V at a constant current of 1.5C and charged to a constant voltage of 0.02C at a rated voltage of 4.4V according to the relevant technology, the total charging time is about 127 minutes.

[0129] Figure 4 FIG. 1 is a structural diagram of a battery charging device according to an exemplary embodiment. Figure 4 As shown, the device includes a determination module 40, a first charging module 41, a second charging module 42, and a third charging module 43.

[0130] The determination module 40 is configured to determine a maximum charging voltage value that the battery can withstand, and the maximum charging voltage value is greater than the rated voltage of the battery;

[0131] The first charging module 41 is configured to charge the battery in the first stage in a constant current and constant voltage manner, wherein constant current charging starts when the charging voltage of the battery reaches a first voltage value, and the first stage charging ends when the charging current of the battery reaches a first current value, the first voltage value is less than or equal to the rated voltage value of the battery, and the first current value is greater than the charging termination current value corresponding to the rated voltage of the battery;

[0132] The second charging module 42 is configured to charge the battery in the second stage according to a preset constant current charging method until the charging voltage of the battery reaches the maximum charging voltage value, and then end the second stage charging;

[0133] The third charging module 43 is configured to perform the third stage charging of the battery in a constant voltage charging manner until the charging current value of the battery reaches the charging termination current value corresponding to the maximum charging voltage value, and then stop charging, wherein the charging voltage of the constant voltage charging in the third stage is greater than or equal to the rated voltage of the battery.

[0134] This embodiment further provides a battery device, in which the determination module includes:

[0135] The first submodule is configured to determine the maximum operating voltage V1 of the battery electrolyte, the critical voltage V2 of the battery positive electrode material and the electrolyte for continuous reaction, and the critical voltage of the battery negative electrode material and the electrolyte for continuous reaction according to the three-electrode system cyclic voltammetry test method;

[0136] The second submodule is configured to determine a maximum charging voltage value according to V1, V2 and V3, wherein the maximum charging voltage value is the smaller value of the following two:

[0137] The difference between V1, V2 and V3.

[0138] This embodiment further provides a battery device, in which the second charging module includes:

[0139] The first submodule is configured to, when the preset constant current charging mode includes a timed charging mode, perform constant current charging on the battery according to a second current value, and when the constant current charging duration reaches a set duration corresponding to the preset constant current charging mode, determine the charging voltage of the battery, wherein the second current value is less than the first current value;

[0140] The second submodule is configured to, when the charging voltage of the battery is less than the maximum charging voltage value, perform constant current charging on the battery again according to a preset constant current charging method;

[0141] The third submodule is configured to end the second stage charging when the charging voltage of the battery is equal to the maximum charging voltage value.

[0142] This embodiment further provides a battery device, in which the second charging module further includes:

[0143] The fourth submodule is configured to perform constant voltage charging on the battery during the second stage charging process, wherein when it is determined that the charging voltage of the battery is less than the maximum charging voltage value, constant voltage charging is performed before the battery is charged with constant current again according to a preset constant current charging method.

[0144] This embodiment further provides a battery device, which further includes:

[0145] The discharge module is configured to perform a discharge operation on the battery during the second stage charging process, wherein when it is determined that the charging voltage of the battery is less than the maximum charging voltage value, the discharge operation is performed before the battery is charged with constant current again according to a preset constant current charging method.

[0146] This embodiment further provides a battery device, in which a third charging module includes:

[0147] The first submodule is configured to perform constant voltage charging on the battery according to the maximum charging voltage value; or

[0148] The second submodule is configured to first discharge the battery and then charge the battery at a constant voltage.

[0149] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0150] Figure 5 is a block diagram of a battery charging device 500 according to an exemplary embodiment. For example, the device 500 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.

[0151] Reference Figure 5 , the device 500 may include one or more of the following components: a processing component 502 , a memory 504 , a power component 506 , a multimedia component 508 , an audio component 510 , an input / output (I / O) interface 512 , a sensor component 514 , and a communication component 516 .

[0152] The processing component 502 generally controls the overall operation of the device 500, such as operations associated with display, phone calls, data communications, camera operations, and recording operations. The processing component 502 may include one or more processors 520 to execute instructions to complete all or part of the steps of the above-mentioned method. In addition, the processing component 502 may include one or more modules to facilitate the interaction between the processing component 502 and other components. For example, the processing component 502 may include a multimedia module to facilitate the interaction between the multimedia component 508 and the processing component 502.

[0153] The memory 504 is configured to store various types of data to support operations on the device 500. Examples of such data include instructions for any application or method operating on the device 500, contact data, phone book data, messages, pictures, videos, etc. The memory 504 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.

[0154] The power supply component 506 provides power to the various components of the device 500. The power supply component 506 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to the device 500.

[0155] The multimedia component 508 includes a screen that provides an output interface between the device 500 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundaries of the touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 508 includes a front camera and / or a rear camera. When the device 500 is in an operating mode, such as a shooting mode or a video mode, the front camera and / or the rear camera may receive external multimedia data. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.

[0156] The audio component 510 is configured to output and / or input audio signals. For example, the audio component 510 includes a microphone (MIC), and when the device 500 is in an operating mode, such as a call mode, a recording mode, and a speech recognition mode, the microphone is configured to receive an external audio signal. The received audio signal can be further stored in the memory 504 or sent via the communication component 516. In some embodiments, the audio component 510 also includes a speaker for outputting audio signals.

[0157] I / O interface 512 provides an interface between processing component 502 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may include but are not limited to: a home button, a volume button, a start button, and a lock button.

[0158] The sensor assembly 514 includes one or more sensors for providing various aspects of status assessment for the device 500. For example, the sensor assembly 514 can detect the open / closed state of the device 500, the relative positioning of components, such as the display and keypad of the device 500, and the sensor assembly 514 can also detect the position change of the device 500 or a component of the device 500, the presence or absence of user contact with the device 500, the orientation or acceleration / deceleration of the device 500, and the temperature change of the device 500. The sensor assembly 514 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor assembly 514 may also include an optical sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 514 may also include an accelerometer, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0159] The communication component 516 is configured to facilitate wired or wireless communication between the device 500 and other devices. The device 500 can access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 516 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 516 also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology and other technologies.

[0160] In an exemplary embodiment, the apparatus 500 may be implemented by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors or other electronic components to perform the above methods.

[0161] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory 504 including instructions, and the instructions can be executed by the processor 520 of the device 500 to perform the above method. For example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0162] A non-transitory computer-readable storage medium, when the instructions in the storage medium are executed by a processor of a mobile terminal, enables the mobile terminal to perform a battery charging method, including:

[0163] Determine the maximum charging voltage value that the battery can withstand, which is greater than the rated voltage of the battery;

[0164] The battery is charged in the first stage in a constant current and constant voltage manner, wherein constant current charging starts when the charging voltage of the battery reaches a first voltage value, and the first stage charging ends when the charging current of the battery reaches a first current value, the first voltage value is less than or equal to the rated voltage value of the battery, and the first current value is greater than the charging termination current value corresponding to the rated voltage of the battery;

[0165] The battery is charged in the second stage according to the preset constant current charging method until the charging voltage of the battery is increased to the maximum charging voltage value, and the second stage charging is ended;

[0166] The battery is charged in the third stage according to the constant voltage charging method until the charging current value of the battery reaches the charging termination current value corresponding to the maximum charging voltage value, and the charging is stopped. The charging voltage of the constant voltage charging in the third stage is greater than or equal to the rated voltage of the battery.

[0167] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed in this disclosure. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0168] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A battery charging method, characterized in that: include: Determining a maximum charging voltage value that a battery can withstand, wherein the maximum charging voltage value is greater than a rated voltage of the battery; The battery is charged in the first stage in a constant current and constant voltage manner, wherein constant current charging starts when the charging voltage of the battery reaches a first voltage value, and the first stage charging ends when the charging current of the battery reaches a first current value, the first voltage value is less than or equal to the rated voltage value of the battery, and the first current value is greater than the charging termination current value corresponding to the rated voltage of the battery; The battery is charged in the second stage according to a preset constant current charging mode until the charging voltage of the battery is increased to a maximum charging voltage value, and the second stage charging is ended, wherein when the preset constant current charging mode includes a timed charging mode, the battery is charged in the constant current according to a second current value, and the second current value is less than the first current value; The battery is charged in the third stage according to the constant voltage charging method until the charging current value of the battery reaches the charging termination current value corresponding to the maximum charging voltage value, and the charging is stopped, wherein the third stage of charging the battery in the constant voltage charging method includes first discharging the battery, and then charging the battery at a constant voltage according to the voltage after the discharge operation, and the charging voltage of the constant voltage charging in the third stage is greater than or equal to the rated voltage of the battery.

2. The method according to claim 1, characterized in that The step of determining the maximum charging voltage value that the battery can withstand includes: Determine the maximum working voltage V1 of the electrolyte of the battery, the critical voltage V2 of the continuous reaction between the positive electrode material of the battery and the electrolyte, and the critical voltage of the continuous reaction between the negative electrode material of the battery and the electrolyte according to the three-electrode system cyclic voltammetry test method; The maximum charging voltage value is determined according to V1, V2 and V3, wherein the maximum charging voltage value is the smaller value of the following two: The difference between V1, V2 and V3.

3. The method according to claim 1 or 2, characterized in that: The second stage charging of the battery according to a preset constant current charging method includes: When the preset constant current charging mode includes a timed charging mode, when the constant current charging duration reaches a set duration corresponding to the preset constant current charging mode, determining the charging voltage of the battery; When the charging voltage of the battery is less than the maximum charging voltage value, the battery is again charged with constant current according to the preset constant current charging mode; When the charging voltage of the battery is equal to the maximum charging voltage value, the second stage charging is ended.

4. The method according to claim 3, characterized in that The method further includes: During the second stage of charging, the battery is charged at a constant voltage, wherein when it is determined that the charging voltage of the battery is less than the maximum charging voltage value, constant voltage charging is performed before the battery is charged at a constant current again according to the preset constant current charging method.

5. The method according to claim 3, characterized in that: The method further includes: During the second stage charging process, the battery is discharged, wherein when it is determined that the charging voltage of the battery is less than the maximum charging voltage value, the battery is discharged before being charged again with constant current according to the preset constant current charging method.

6. A battery charging device, characterized in that: include: A determination module, used to determine a maximum charging voltage value that a battery can withstand, wherein the maximum charging voltage value is greater than a rated voltage of the battery; A first charging module, used for performing a first-stage charging of the battery in a constant current and constant voltage manner, wherein constant current charging starts when the charging voltage of the battery reaches a first voltage value, and the first-stage charging ends when the charging current of the battery reaches a first current value, the first voltage value is less than or equal to the rated voltage value of the battery, and the first current value is greater than the charging termination current value corresponding to the rated voltage of the battery; a second charging module, configured to perform a second-stage charging of the battery according to a preset constant-current charging mode, until the charging voltage of the battery is increased to a maximum charging voltage value, and then terminate the second-stage charging, wherein the second charging module includes a first submodule, configured to perform constant-current charging of the battery according to a second current value when the preset constant-current charging mode includes a timed charging mode, and the second current value is less than the first current value; The third charging module is used to perform a third stage of charging the battery in a constant voltage charging manner until the charging current value of the battery reaches a charging termination current value corresponding to the maximum charging voltage value, and then stop charging, wherein the third charging module includes a second submodule, which is used to first perform a discharge operation on the battery, and perform constant voltage charging on the battery according to the voltage after the discharge operation, and the charging voltage of the constant voltage charging in the third stage is greater than or equal to the rated voltage of the battery.

7. The device according to claim 6, characterized in that The determination module comprises: The first submodule is used to determine the maximum working voltage V1 of the electrolyte of the battery, the critical voltage V2 of the continuous reaction between the positive electrode material of the battery and the electrolyte, and the critical voltage of the continuous reaction between the negative electrode material of the battery and the electrolyte according to the three-electrode system cyclic voltammetry test method; The second submodule is used to determine the maximum charging voltage value according to V1, V2 and V3, wherein the maximum charging voltage value is the smaller value of the following two: The difference between V1, V2 and V3.

8. The device according to claim 6 or 7, characterized in that The second charging module comprises: The first submodule is used to determine the charging voltage of the battery when the constant current charging time reaches the set time corresponding to the preset constant current charging mode when the preset constant current charging mode includes a timed charging mode; A second submodule is used for performing constant current charging on the battery again according to the preset constant current charging mode when the charging voltage of the battery is less than the maximum charging voltage value; The third submodule is used to end the second stage charging when the charging voltage of the battery is equal to the maximum charging voltage value.

9. The device according to claim 8, characterized in that The second charging module further includes: The fourth submodule is used to perform constant voltage charging on the battery during the second stage of charging, wherein when it is determined that the charging voltage of the battery is less than the maximum charging voltage value, constant voltage charging is performed before the battery is charged with constant current again according to the preset constant current charging method.

10. The device according to claim 8, characterized in that The device also includes: The discharge module is used to perform a discharge operation on the battery during the second stage charging process, wherein when it is determined that the charging voltage of the battery is less than the maximum charging voltage value, the discharge operation is performed before the battery is charged with constant current again according to the preset constant current charging method.

11. A battery charging device, characterized in that: include: processor; a memory for storing processor-executable instructions; Wherein, the processor is configured to: Determining a maximum charging voltage value that a battery can withstand, wherein the maximum charging voltage value is greater than a rated voltage of the battery; The battery is charged in the first stage in a constant current and constant voltage manner, wherein constant current charging starts when the charging voltage of the battery reaches a first voltage value, and the first stage charging ends when the charging current of the battery reaches a first current value, the first voltage value is less than or equal to the rated voltage value of the battery, and the first current value is greater than the charging termination current value corresponding to the rated voltage of the battery; The battery is charged in the second stage according to a preset constant current charging mode until the charging voltage of the battery is increased to a maximum charging voltage value, and the second stage charging is ended, wherein when the preset constant current charging mode includes a timed charging mode, the battery is charged in the constant current according to a second current value, and the second current value is less than the first current value; The battery is charged in the third stage according to the constant voltage charging method until the charging current value of the battery reaches the charging termination current value corresponding to the maximum charging voltage value, and the charging is stopped, wherein the third stage of charging the battery in the constant voltage charging method includes first discharging the battery, and then charging the battery at a constant voltage according to the voltage after the discharge operation, and the charging voltage of the constant voltage charging in the third stage is greater than or equal to the rated voltage of the battery.

12. A non-transitory computer-readable storage medium, when the instructions in the storage medium are executed by a processor of a terminal device, enables the terminal device to perform a battery charging method, the method comprising: Determining a maximum charging voltage value that a battery can withstand, wherein the maximum charging voltage value is greater than a rated voltage of the battery; The battery is charged in the first stage in a constant current and constant voltage manner, wherein constant current charging starts when the charging voltage of the battery reaches a first voltage value, and the first stage charging ends when the charging current of the battery reaches a first current value, the first voltage value is less than or equal to the rated voltage value of the battery, and the first current value is greater than the charging termination current value corresponding to the rated voltage of the battery; The battery is charged in the second stage according to a preset constant current charging mode until the charging voltage of the battery is increased to a maximum charging voltage value, and the second stage charging is ended, wherein when the preset constant current charging mode includes a timed charging mode, the battery is charged in the constant current according to a second current value, and the second current value is less than the first current value; The battery is charged in the third stage according to the constant voltage charging method until the charging current value of the battery reaches the charging termination current value corresponding to the maximum charging voltage value, and the charging is stopped, wherein the third stage of charging the battery in the constant voltage charging method includes first discharging the battery, and then charging the battery at a constant voltage according to the voltage after the discharge operation, and the charging voltage of the constant voltage charging in the third stage is greater than or equal to the rated voltage of the battery.

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