WO2017214852A1

WO2017214852A1 - Battery charging method and device and battery system

Info

Publication number: WO2017214852A1
Application number: PCT/CN2016/085687
Authority: WO
Inventors: 范会平; 明帮生; 赵德强; 高伟; 汪颖; 沈海杰
Original assignee: 宁德新能源科技有限公司
Priority date: 2016-06-14
Filing date: 2016-06-14
Publication date: 2017-12-21

Abstract

A battery charging method, a battery charging device and a battery system. The method comprises: acquiring battery usage data, the battery usage data comprising at least one of the number of cycles of the battery and a accumulated time of the battery (S101); detecting whether the battery usage data satisfies a condition of lowering a charging cutoff voltage of the battery (S102); if the detected battery usage data satisfies the condition of lowering the charging cutoff voltage of the battery, lowering the charging cut-off voltage of the battery (S103); and charging the battery according to the lowered charging cutoff voltage of the battery (S104). The problem of shortening battery service life caused by a high charging cut-off voltage of the battery in the prior art is solved.

Description

Battery charging method, device and battery system

Technical field

The present application relates to the field of battery technologies, and in particular, to a battery charging method, device, and battery system.

Background technique

With the continuous breakthrough and development of battery technology, the requirements for the cycle life of secondary batteries are becoming higher and higher, for example, the cycle life of batteries is increased from 500 cycles to 800 cycles, 1000 cycles, or even 1500 cycles. At the same time, the requirements for the energy density of the battery are also getting higher and higher. Increasing the cathode gram capacity by increasing the charge cut-off voltage of the battery is an effective means for increasing the energy density of the battery.

In the process of implementing the present application, the applicant found that at least the following problems exist in the prior art:

In the prior art, for a battery with high energy density, the charge cut-off voltage of the battery remains unchanged throughout the cycle, and maintaining a high voltage for a long time causes a high irreversible capacity loss, affecting the overall performance of the battery, because the battery The charging cut-off voltage is relatively high. During the recycling of the battery, lithium ions are continuously embedded and deintercalated in the cathode material of the layered structure. When the battery is always in a high voltage state during charging, the crystal of the cathode material is accelerated. Type, and lead to rapid oxidative decomposition of the electrolyte, which will accelerate the energy attenuation and capacity attenuation of the battery, resulting in shorter battery life.

Application content

The present application provides a charging method, a charging device, and a battery system for a battery to solve the problem of shortening the service life of the battery due to a high charging cutoff voltage of the battery in the prior art.

The application provides a charging method for a battery, including:

Obtaining usage data of the battery, the usage data of the battery including at least one of a number of cycles of the battery and a cumulative time of the battery;

Detecting whether the usage data of the battery satisfies a condition for lowering a charge cutoff voltage of the battery;

If it is detected that the usage data of the battery satisfies a condition for lowering a charge cutoff voltage of the battery, reducing a charge cutoff voltage of the battery;

The battery is charged according to the charge cutoff voltage of the battery after the reduction.

The aspect as described above and any possible implementation manner further provide an implementation, if the usage data of the battery includes the number of cycles of the battery and the accumulated time of the battery, detecting whether the usage data of the battery is Satisfying the conditions for lowering the charge cutoff voltage of the battery, including:

Comparing the obtained number of cycles of the battery with a preset cycle number threshold, and comparing the acquired accumulated time of the battery with a preset accumulated time threshold;

If it is satisfied that the number of cycles of the battery is equal to at least one of the preset number of cycles threshold and the accumulated time of the battery is equal to the preset accumulated time threshold, detecting that the usage data of the battery satisfies the reduction of the battery The condition of the charge cutoff voltage.

An aspect as described above, and any possible implementation, further providing an implementation, wherein the number of cycles of the battery includes at least one of a total number of cycles of the battery and a number of cycles in which the battery maintains the same charge cutoff voltage .

The aspect as described above and any possible implementation manner further provide an implementation manner, wherein the accumulated time of the battery includes at least a total accumulated time of the battery and a cycle cumulative time in which the battery maintains the same charge cutoff voltage One.

The aspect as described above and any possible implementation manner further provide an implementation manner, the usage data of the battery is the number of cycles of the battery, and detecting whether the usage data of the battery is satisfied to reduce the charging cutoff of the battery Voltage conditions, including:

If the number of cycles of the battery is the total number of cycles of the battery or the number of cycles in which the battery maintains the same charge cutoff voltage, the obtained number of cycles of the battery is compared with a corresponding cycle number threshold;

If the number of cycles of the battery is equal to the corresponding number of cycles threshold, the usage data of the battery is detected to satisfy the condition of lowering the charge cutoff voltage of the battery.

If the number of cycles of the battery is the total number of cycles of the battery and the number of cycles in which the battery maintains the same charge cutoff voltage, the total number of cycles of the obtained battery is compared with a corresponding cycle number threshold, and Comparing the number of cycles in which the battery maintains the same charge cutoff voltage with a corresponding cycle number threshold;

If it is satisfied that the total number of cycles of the battery is equal to the corresponding cycle number threshold and the number of cycles of the battery maintaining the same charge cutoff voltage is equal to at least one of the corresponding cycle number thresholds, detecting that the battery usage data satisfies the reduction The condition of the charge cutoff voltage of the battery.

The aspect as described above and any possible implementation manner further provide an implementation manner, the usage data of the battery is a cumulative time of the battery, and detecting whether the usage data of the battery is satisfied to reduce the charging cutoff of the battery Voltage conditions, including:

If the accumulated time of the battery is the total accumulated time of the battery or the accumulated time of the battery maintaining the same charging cutoff voltage, the accumulated time of the obtained battery is compared with the corresponding accumulated time threshold;

If the accumulated time of the battery is equal to the corresponding accumulated time threshold, detecting that the usage data of the battery satisfies the condition of lowering the charge cutoff voltage of the battery.

If the accumulated time of the battery is the total accumulated time of the battery and the accumulated time of the same charging cutoff voltage of the battery, the total accumulated time of the obtained battery is compared with a corresponding accumulated time threshold, and Comparing the accumulated time of the battery to the same charge cutoff voltage and the corresponding accumulated time threshold;

If it is satisfied that the total accumulated time of the battery is equal to the corresponding accumulated time threshold and the accumulated time of the battery maintaining the same charging cutoff voltage is equal to at least one of the corresponding accumulated time thresholds, detecting that the usage data of the battery satisfies the lowering The condition of the charge cutoff voltage of the battery.

The aspect as described above and any possible implementation manner further provide an implementation manner, if it is detected that the usage data of the battery satisfies a condition for lowering a charge cutoff voltage of the battery, and reducing a charge cutoff voltage of the battery, include:

Decreasing the charge cutoff voltage of the battery according to a preset voltage difference; or

a preset charge cutoff voltage candidate set, wherein the charge cutoff voltage candidate set includes at least one candidate voltage; and a candidate voltage lower than a charge cutoff voltage of the battery in the charge cutoff voltage candidate set is used as the reduced battery The charge cut-off voltage.

The aspect as described above and any possible implementation manner further provide an implementation manner, where the method further includes:

Obtaining the number of battery cycles in which the battery is completed as the number of cycles of the battery; or

Obtaining the number of times the battery is greater than or equal to the charge cutoff voltage as the number of cycles of the battery; or

Obtaining a number of times that the remaining power of the battery is greater than or equal to the remaining power corresponding to the charge cutoff voltage, as the number of cycles of the battery;

Wherein, one battery cycle includes a charging process and a discharging process, the charging process includes: charging the battery to a charging cutoff voltage; and the discharging process comprises: discharging the battery.

Dividing at least two temperature segments according to a temperature of the battery, and setting a corresponding cycle time threshold of the battery and/or a cumulative time threshold of the battery for each temperature segment;

Determining a temperature segment corresponding to a current temperature of the battery according to a current temperature of the battery;

A cycle time threshold of the battery and/or a cumulative time threshold of the battery is determined based on the temperature segment.

One technical solution in the technical solution of the present application has the following beneficial effects:

In the technical solution of the present application, the usage data of the battery is obtained, wherein the usage data of the battery includes at least one of the number of cycles of the battery and the accumulated time of the battery, and then, detecting whether the usage data of the battery satisfies the condition for lowering the charge cutoff voltage of the battery If it is detected that the usage data of the battery satisfies the condition of lowering the charge cutoff voltage of the battery, and lowering the charge cutoff voltage of the battery, the battery can be charged according to the reduced charge cutoff voltage of the battery. According to the technical solution of the present application, it is judged whether the condition for lowering the charge cutoff voltage of the battery is reached, and the charge cutoff voltage of the battery is lowered when the condition for lowering the charge cutoff voltage of the battery is reached, thereby avoiding a higher charge cutoff voltage. The resulting cathode potential is too high, thereby accelerating the destruction of the crystal form of the cathode material and the oxidative decomposition of the electrolyte, avoiding the high irreversible energy loss caused by the battery under high pressure for a long time, and the overall performance of the battery. Impact. Compared with the prior art, the technical solution of the present application can slow down the battery capacity retention rate and the battery energy retention rate, effectively prolong the life of the rechargeable battery, and solve the charging cutoff voltage of the battery in the prior art. The problem of shortening the service life of the battery caused by the higher.

The application also provides a charging device for a battery, comprising:

An acquisition unit, configured to acquire usage data of a battery, where usage data of the battery includes the electricity At least one of a number of cycles of the pool and a cumulative time of the battery;

a detecting unit, configured to detect whether the usage data of the battery satisfies a condition for reducing a charging cutoff voltage of the battery;

a adjusting unit, configured to reduce a charging cutoff voltage of the battery if the usage data of the battery is detected to satisfy a condition for lowering a charging cutoff voltage of the battery;

And a charging unit configured to charge the battery according to a charge cutoff voltage of the battery after the reduction.

The aspect as described above, and any possible implementation manner, further providing an implementation manner, if the usage data of the battery acquired by the acquiring unit includes a number of cycles of the battery and a cumulative time of the battery, The detecting unit is specifically used for:

The aspect as described above, and any possible implementation manner, further providing an implementation manner, if the usage data of the battery acquired by the acquiring unit is the number of cycles of the battery, the detecting unit is specifically used to :

An aspect of the above, and any possible implementation, further providing an implementation manner, If the usage data of the battery acquired by the acquiring unit is the number of cycles of the battery, the detecting unit is specifically configured to:

The aspect as described above, and any possible implementation manner, further provide an implementation manner, if the usage data of the battery acquired by the acquiring unit is the accumulated time of the battery, the detecting unit is specifically used to :

The above-mentioned aspect and any possible implementation manner further provide an implementation manner, where the adjusting unit is specifically configured to:

The above-mentioned aspect and any possible implementation manner further provide an implementation manner, where the acquiring unit is specifically configured to:

The above-mentioned aspect and any possible implementation manner further provide an implementation manner, where the detecting unit is further configured to:

In the technical solution of the present application, the usage data of the battery is acquired by the acquisition unit of the charging device of the battery, wherein the usage data of the battery includes at least one of the number of cycles of the battery and the accumulated time of the battery, and then the detection unit in the charging device of the battery Detecting whether the usage data of the battery satisfies the condition for lowering the charge cutoff voltage of the battery. If it is detected that the use data of the battery satisfies the condition of lowering the charge cutoff voltage of the battery, the adjustment unit in the charging device of the battery lowers the charge cutoff voltage of the battery, after that, The charging unit in the charging device of the battery can charge the battery according to the reduced charging cutoff voltage of the battery. According to the technical solution of the present application, it is judged whether the condition for lowering the charge cutoff voltage of the battery is reached, and the charge cutoff voltage of the battery is lowered when the condition for lowering the charge cutoff voltage of the battery is reached, thereby avoiding a higher charge cutoff voltage. The resulting cathode potential is too high, thereby accelerating the destruction of the crystal form of the cathode material and the problem of oxidative decomposition of the electrolyte. The high irreversible energy loss caused by the battery under high pressure for a long time and the influence on the overall performance of the battery are avoided. Compared with the prior art, the technical solution of the present application can slow down the battery capacity retention rate and the battery energy retention rate, effectively prolong the life of the rechargeable battery, and solve the charging cutoff voltage of the battery in the prior art. The problem of shortening the service life of the battery caused by the higher.

The application also provides a battery system comprising: a battery and a charging device of the above battery.

In the technical solution of the present application, according to the use data of the battery, it is judged whether the condition for lowering the charge cutoff voltage of the battery is reached, and when the condition for lowering the charge cutoff voltage of the battery is reached, the charge cutoff voltage of the battery is lowered, and the charge cutoff voltage is avoided. The high cathode potential is too high, thereby accelerating the destruction of the crystal form of the cathode material and the oxidative decomposition of the electrolyte, avoiding the high irreversible energy loss caused by the battery under high pressure for a long time, and the overall battery The impact of performance. Compared with the prior art, the technical solution of the present application can slow down the battery capacity retention rate and the battery energy retention rate, effectively prolong the life of the rechargeable battery, and solve the charging cutoff voltage of the battery in the prior art. The problem of shortening the service life of the battery caused by the higher.

DRAWINGS

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present application, and other drawings can be obtained according to the drawings without any creative labor for those skilled in the art.

1 is a schematic flow chart of Embodiment 1 of a method for charging a battery according to an embodiment of the present application;

2 is a schematic diagram showing the relationship between the voltage of the battery and the remaining power in the embodiment of the present application;

3 is a schematic flowchart of Embodiment 2 of a method for charging a battery according to an embodiment of the present application;

4 is a schematic flow chart of Embodiment 3 of a method for charging a battery according to an embodiment of the present application;

FIG. 5 is a schematic flowchart diagram of Embodiment 4 of a method for charging a battery according to an embodiment of the present disclosure;

6 is a first comparison diagram of a cycle curve obtained in an embodiment of the present application and a cycle curve obtained in the prior art;

7 is a second comparison diagram of a cycle curve obtained in an embodiment of the present application and a cycle curve obtained in the prior art;

8 is a third comparative diagram of a cycle curve obtained in an embodiment of the present application and a cycle curve obtained in the prior art;

FIG. 9 is a functional block diagram of a charging device for a battery according to an embodiment of the present application; FIG.

FIG. 10 is a functional block diagram of a battery system according to an embodiment of the present application; FIG.

FIG. 11 is a schematic diagram of Embodiment 1 of a battery system according to an embodiment of the present application; FIG.

FIG. 12 is a schematic diagram of Embodiment 2 of a battery system according to an embodiment of the present disclosure;

FIG. 13 is a schematic diagram of Embodiment 3 of a battery system according to an embodiment of the present application.

detailed description

The technical solutions in the embodiments of the present application are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present application. It is a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present application without departing from the inventive scope are the scope of the present application.

Embodiment 1

The embodiment of the present application provides a charging method of a battery. Please refer to FIG. 1 , which is a schematic flowchart of Embodiment 1 of a charging method of a battery provided by an embodiment of the present application. As shown in Figure 1, the method includes:

S101. Acquire usage data of the battery, and the usage data of the battery includes at least one of a number of cycles of the battery and a cumulative time of the battery.

Specifically, in the embodiment of the present application, the usage data of the battery is obtained, so as to determine whether to reduce the charging cutoff voltage of the battery according to the usage data of the battery. In the present application, the usage data of the battery may include, but is not limited to, at least one of the number of cycles of the battery and the accumulated time of the battery.

During use of the battery, the battery undergoes at least one charging process and at least one discharge process. In the embodiment of the present application, a battery cycle may include, but is not limited to, a charging process and a discharging process. During the battery cycle, the charging process and the sequence of performing the discharging process are not specifically limited. In a specific implementation process, a battery cycle may first perform a charging process and then perform a discharging process, or a battery cycle may first perform a discharging process and then perform a charging process.

It can be understood that when the number of cycles of the battery is obtained, if the charging process starts from the battery Beginning to calculate the number of cycles, during the subsequent battery cycle, each battery cycle begins with the battery charging process and ends with the battery discharge process. Alternatively, when the number of cycles of the battery is obtained, if the number of cycles is calculated starting from the beginning of the discharge process of the battery, each battery cycle starts with the discharge process of the battery during the subsequent battery cycle, and ends with the charging process of the battery. .

It should be noted that, in the embodiment of the present invention, when the usage data of the battery is obtained, whether the battery is in the use state during the charging process and the discharging process, or whether the battery is in the storage state, the embodiment of the present application does not particularly limit this. The application embodiment only needs to satisfy the above one charging process and the above one discharging process as one battery cycle, and further, the number of cycles of the battery can be obtained; it can be understood that when the accumulated time of the battery is obtained, the battery is in use or the battery is in the state of being The storage state is not particularly limited in this embodiment of the present application. The embodiment of the present application only uses the accumulated time after starting the timing as the accumulated time of the battery to obtain the accumulated time of the battery.

It should be noted that, in the embodiment of the present application, in the charging process of the battery cycle, the manner in which the battery is charged may have various implementation methods, and the charging method of the battery may include, but is not limited to, constant current charging, constant voltage charging, At least one of step-by-step charging, constant power charging, constant current constant voltage charging, and pulse charging is not specifically limited in the embodiment of the present application. During the discharge process of the battery cycle, the battery can be discharged in a plurality of ways. The battery discharge method can include, but is not limited to, at least one of a constant current discharge and a constant power discharge. Special restrictions are made.

In a specific implementation process, in the embodiment of the present application, the number of cycles of acquiring the battery may include, but is not limited to, the following three modes:

First type: The number of cycles in which the battery is subjected to a charging process and a discharging process is performed as the number of cycles of the battery.

It should be noted that the number of cycles in which the battery is subjected to one charging process and one discharging process is performed as the number of cycles of the battery. At this time, the number of cycles of the battery is acquired, and it is not necessary to consider the charging cutoff voltage, the charging upper limit voltage of the battery during charging, Charging time, charging capacity, charging energy, etc., do not need to consider the discharge cutoff voltage, discharge lower limit voltage, discharge time, discharge capacity, discharge energy, etc. of the battery during discharge, as long as the battery performs a charging process and performs a discharge In the process, the number of cycles of the battery is increased by one.

In a specific implementation process, the current change of the battery and/or the voltage change of the battery can be detected to determine the number of times the battery is charged and the discharge process is performed, and then the electricity can be determined. The number of cycles in the pool. The number of cycles of the battery is determined by detecting a change in the current of the battery and/or a change in the voltage of the battery, but is a specific implementation of the embodiment of the present invention and is not intended to limit the present invention.

For example, for a battery with an operating voltage range of 3.0V to 4.35V, the initial voltage of the battery is 3.8V, the battery is charged once, the charging process is 5 minutes, the charging process is finished, and the battery voltage is 3.81V; The battery was subjected to a discharge process. The duration of the discharge process was 10 minutes, the discharge process was completed, and the battery voltage was 3.75V. At this time, regardless of whether the voltage of the battery reaches the charging upper limit voltage during the charging process, and whether the voltage of the battery reaches the discharge lower limit voltage during the discharging process, the battery performs a charging process and a discharging process, so the battery is obtained. The number of cycles is 1.

Second: The number of times the maximum voltage of the battery is greater than or equal to the upper limit voltage of the charge and the minimum voltage of the battery is less than or equal to the lower limit voltage of the discharge is taken as the number of cycles of the battery.

It should be noted that the maximum voltage of the battery is greater than or equal to the charging upper limit voltage and the minimum voltage of the battery is less than or equal to the lower limit voltage of the discharge. At this time, the charging process of the battery includes: charging the battery to the upper limit voltage of charging; and discharging the battery. Including: battery discharge to discharge lower limit voltage.

In a specific implementation process, it is only required to detect whether the maximum voltage of the battery is greater than or equal to a preset charging upper limit voltage, and detect whether the minimum voltage of the battery is less than or equal to a preset lower limit voltage to determine whether the battery is completed. Battery cycle. For example, if the maximum voltage of the battery is less than the upper limit voltage of charging, the minimum voltage of the battery is less than or equal to the lower limit voltage of the discharge, and the number of cycles of the obtained battery is zero. Or, for example, if the maximum voltage of the battery is greater than or equal to the upper limit voltage of charging, the minimum voltage of the battery is greater than the lower limit voltage of the discharge, and the number of cycles of the obtained battery is zero. Or, for example, if the maximum voltage of the battery is greater than or equal to the upper limit voltage of charging, the minimum voltage of the battery is less than or equal to the lower limit voltage of the discharge, and the number of cycles of the obtained battery is 1.

It should be noted that the upper limit voltage of the battery is used to calculate the number of cycles of the battery, and the value of the upper limit voltage of the battery may be less than or equal to the charge cut-off voltage of the battery. In a specific implementation process, the upper limit voltage of the battery may be based on actual conditions. The preset is not limited in this embodiment of the present invention.

It should be noted that the discharge lower limit voltage of the battery is used to calculate the number of cycles of the battery, and the discharge lower limit voltage of the battery may be greater than or equal to the discharge cutoff voltage of the battery. In a specific implementation process, the discharge lower limit voltage of the battery may be based on actual conditions. Need to make a preset, this embodiment of the present invention No particular limitation is imposed.

In a specific implementation process, the discharge cutoff voltage of the battery during the discharge process of the cycle may range from 1.0V to 3.8V, and the discharge lower limit voltage of the battery may be preset within a range lower than the discharge cutoff voltage of the battery. .

For example, for a battery with a working voltage range of 3.0V to 4.35V, the battery's charge cut-off voltage is 4.35V, and the battery's discharge cut-off voltage is 3.0V. Therefore, it can be preset to be lower than the battery's charge cut-off voltage of 4.35V. The charging upper limit voltage, for example, the upper limit charging voltage of the preset battery is 4.2V; a lower discharge voltage higher than the discharge cutoff voltage of the battery of 3.0V can be preset, for example, the discharge lower limit voltage of the preset battery is 3.2V.

For example, for a battery with an operating voltage range of 3.0V to 4.35V, if the initial voltage of the battery is 3.8V, the upper limit voltage of the battery is 4.2V, and the lower limit voltage of the battery is 3.2V, then only the battery is required to be cycled. In the process, the maximum voltage of the battery is greater than or equal to the battery charging upper limit voltage 4.2V and the minimum voltage of the battery is less than the battery discharge lower limit voltage 3.2V, the number of cycles of the battery can be determined. If the battery is in the process of cycling, the maximum voltage of the battery is greater than or equal to the battery charging upper limit voltage 4.2V and the minimum voltage of the battery is less than the battery discharge lower limit voltage 3.2V four times, the number of cycles of the obtained battery Is 4.

The third type: obtaining the maximum remaining power of the battery is greater than or equal to the remaining power corresponding to the charging upper limit voltage and the minimum remaining power of the battery is less than or equal to the number of remaining power corresponding to the lower limit voltage of the battery, as the number of cycles of the battery.

Please refer to FIG. 2 , which is a schematic diagram of the correspondence between the voltage of the battery and the remaining power in the embodiment of the present application. As shown in FIG. 2, a correspondence relationship between the voltage of the battery and the remaining power of the battery can be established, wherein V1 represents the upper limit voltage of the battery, and SOC1 is the remaining power corresponding to the upper limit voltage of the battery; V2 represents the battery. The lower limit voltage of the discharge, SOC2 is the remaining charge corresponding to the lower limit voltage of the discharge of the battery.

In a specific implementation process, by using the correspondence between the voltage of the battery and the remaining power of the battery, it is only necessary to detect whether the maximum remaining battery capacity of the battery is greater than or equal to the remaining power corresponding to the preset charging upper limit voltage, and detect the minimum remaining battery. Whether the power is less than or equal to the remaining power corresponding to the preset lower limit voltage to determine whether the battery has completed a battery cycle. For example, if the maximum remaining battery capacity of the battery is less than the remaining power corresponding to the charging upper limit voltage, the minimum remaining battery power of the battery is less than or equal to the remaining power corresponding to the lower discharge voltage, and the number of cycles of the obtained battery is zero. Or, for example, if the maximum remaining power of the battery is greater than or equal to the remaining power corresponding to the charging upper limit voltage, the minimum remaining power of the battery is greater than the remaining power corresponding to the lower discharging voltage, and the number of cycles of the obtained battery is zero. Or, for example, if the maximum remaining power of the battery is greater than or equal to the remaining power corresponding to the charging upper limit voltage, the minimum remaining power of the battery is less than or equal to the remaining power corresponding to the lower limit voltage, and the number of cycles of the obtained battery is 1.

For example, for a battery with a working voltage range of 3.0V to 4.35V, the initial voltage of the battery is less than the upper limit voltage of the battery, and the remaining power corresponding to the upper limit voltage of the battery is 98%, corresponding to the lower limit voltage of the battery. The remaining power is 10%, then only need to determine that the battery is in the process of cycling, the maximum remaining battery capacity is greater than or equal to 98% of the remaining power corresponding to the battery's upper charging voltage and the minimum remaining battery capacity is less than or equal to the battery discharge. The number of cycles of the battery can be determined by the number of times the remaining amount of power corresponding to the lower limit voltage is 10%. If the battery is in the process of cycling, the maximum remaining power of the obtained battery is greater than or equal to 98% of the remaining power corresponding to the upper limit voltage of the battery, and the minimum remaining capacity of the battery is less than or equal to 10% of the remaining power corresponding to the lower limit voltage of the battery. There are 3 times, and the number of cycles of the obtained battery is 3.

In a specific implementation process, the remaining power of the battery corresponding to the upper limit voltage of the battery may be set to 80% to 100%; the remaining power of the battery corresponding to the lower discharge voltage of the battery may be set to 0% to 15%.

It should be noted that, when the number of cycles of the battery is obtained, the first cycle of the battery start counting may be set according to actual needs, which is not specifically limited in the embodiment of the present application. Taking the beginning of the battery life as an example, the first cycle of the beginning of the battery life can be used as the first cycle of starting the counting; or, the Nth cycle of the beginning of the battery life can be used as the first one of the starting counting. cycle.

Specifically, the number of cycles of the battery may include at least one of a total number of cycles of the battery and a number of cycles in which the battery maintains the same charge cutoff voltage.

In the embodiment of the present application, the total number of cycles of the battery is the total number of cycles obtained by counting the subsequent battery cycles starting from the first cycle in which the battery starts counting. It will be appreciated that no segmentation counts are required during subsequent battery cycles. It can also be understood that if the first cycle of battery life begins as the first cycle of starting counting, the total number of cycles of the battery is the number of cycles performed after the initial battery life; if the battery life begins to be the nth ( n is an integer greater than 1) cycles as the first cycle of starting counting, then the total number of cycles of the battery and battery life The number of cycles performed after the start is different.

For example, if the first cycle of the start of battery life is taken as the first cycle of starting counting, the eighth cycle performed after the start of battery life is the eighth cycle of the total number of cycles of the battery in the embodiment of the present application. If the fifth cycle of the start of battery life is taken as the first cycle of starting counting, the eighth cycle performed after the start of battery life is the fourth cycle of the total number of cycles of the battery in the embodiment of the present application.

In the embodiment of the present application, different from the total number of cycles of the battery, the number of cycles in which the battery maintains the same charge cutoff voltage is a cycle in which the charge cutoff voltage of the battery is lowered as the first cycle of starting counting, and the cycle is performed by segment counting. number. It will be appreciated that multiple segment counts will occur during the cycling of the battery.

For example, if the first cycle to the 7th cycle of the total number of cycles of the battery maintains the same charge cutoff voltage, the same cycle is maintained from the 8th cycle to the 12th cycle in the total number of cycles of the battery. With the cutoff voltage, the battery will perform 2 segment counts in the 12 cycles of the total number of cycles of the battery. Among them, in the second segment count, the eighth cycle of the total number of battery cycles is the first cycle of the second segment count of the battery, and the 12th cycle of the total number of battery cycles is the second segment of the battery. Count the 5th cycle.

It can be understood that, in a specific implementation process, the number of cycles of the battery can be obtained, the total number of cycles of the battery can be obtained, or the number of cycles in which the battery maintains the same charge cutoff voltage can be obtained, or the total cycle of the battery can be obtained. The number and number of cycles in which the battery maintains the same charge cut-off voltage.

In a specific implementation process, when the number of cycles of the battery is obtained, it can be counted by a loop counter, which is not specifically limited in this embodiment of the present application.

Specifically, the usage data of the battery further includes a cumulative time of the battery, and the accumulated time of the battery includes at least one of a total accumulated time of the battery and a cumulative time that the battery maintains the same charge cutoff voltage.

In the embodiment of the present application, the total accumulated time of the battery is the total accumulated time obtained by counting the battery cycle from the time when the battery starts counting. It will be appreciated that no segmentation timing is required during subsequent battery cycles. The starting time of the battery life is taken as an example. If the time when the battery life starts is used as the time to start counting, the total accumulated time of the battery is the accumulated time after the battery life starts; if some time after the battery life starts As the time to start counting, the total accumulated time of the battery is different from the accumulated time after the start of the battery life.

For example, if the time when the battery life starts is used as the time to start counting, the 30th month of the accumulated time after the start of the battery life is the 30th month of the total accumulated time of the battery in the embodiment of the present application; The 31st month of the cumulative time after the start of the life is the 20th month of the cumulative time of the battery after the start of the battery life, which is the 20th month of the total accumulated time of the battery in the embodiment of the present application.

In the embodiment of the present application, the accumulated time when the battery maintains the same charge cut-off voltage is the cumulative time obtained by counting the time from the time when the charge cut-off voltage of the battery is lowered, and the cumulative time obtained by the segmentation timing is different from the total accumulated time of the battery. It can be understood that multiple segmentation timings are passed during the cycling of the battery.

For example, if the same charge cut-off voltage is maintained from the first month to the 30th month of the total accumulated time of the battery, another identical charge is maintained from the 31st to the 50th month of the total accumulated time of the battery. At the cutoff voltage, the battery will perform two sub-times during the 50 months of the total accumulated time of the battery. Among them, in the second sub-time counting, the 31st month of the total accumulated battery time is the first month when the battery is counted for the second time, and the 50th month of the total number of battery cycles is the second time of the battery. The 20th month when the segment counts.

It can be understood that, in a specific implementation process, the total accumulated time of the battery can be obtained, or the accumulated time of the battery to maintain the same charging cut-off voltage can be obtained, or the total accumulated time of the battery can be obtained and the battery remains the same. The cumulative time of the charge cut-off voltage.

In a specific implementation process, when the accumulated time of the battery is obtained, the time recorder can be used for timing. This embodiment of the present application does not specifically limit this.

S102. Detect whether the usage data of the battery satisfies the condition for lowering the charge cutoff voltage of the battery.

In the embodiment of the present application, according to the acquired usage data of the battery, different judgment conditions may be used to detect whether the usage data of the battery satisfies the condition for lowering the charge cutoff voltage of the battery. Specifically, according to the obtained usage data of the battery, detecting whether the condition for lowering the charge cutoff voltage of the battery is met may include, but is not limited to, the following three cases:

First: If the acquired usage data of the battery is the number of cycles of the battery, the number of cycles of the battery is compared with a corresponding cycle number threshold to determine whether the condition for lowering the charge cutoff voltage of the battery is satisfied.

In the embodiment of the present application, the acquired usage data of the battery may be at least one of a total number of cycles of the battery in the number of cycles of the battery and a number of cycles in which the battery maintains the same charge cutoff voltage. That is, the acquired usage data of the battery is the number of cycles of the battery, and may include but is not limited to the following three cases:

(1A) Specifically, the usage data of the obtained battery may be the total number of cycles of the battery.

If the acquired usage data of the battery is the total number of cycles of the battery, the total number of cycles of the obtained battery may be compared with a corresponding cycle number threshold (ie, a total cycle number threshold), if the number of cycles of the obtained battery is obtained. Equal to the total number of cycles threshold, the battery usage data is detected to satisfy the condition of lowering the charge cutoff voltage of the battery.

It should be noted that, in the embodiment of the present application, the total number of cycles of the at least one battery may be set, which is not specifically limited in this embodiment of the present application. For example, the total number of cycles of the battery can be set to a threshold of N1, N2, ..., Nn, where n is an integer greater than zero. When comparing the total number of cycles of the obtained battery with the total cycle number threshold, it is only necessary to determine that the total number of cycles of the acquired battery is equal to a total number of cycles of the preset at least one total number of cycles threshold, that is, The number of cycles of the obtained battery is equal to the total number of cycles threshold, and it is detected that the usage data of the battery satisfies the condition of lowering the charge cutoff voltage of the battery.

For example, suppose that the threshold of the total number of cycles with the battery is preset to be 10, 20, 30, that is, when the total number of cycles of the battery reaches the 10th cycle, the 20th cycle, and the 30th cycle, it is considered that the battery is lowered. The condition of the charge cut-off voltage. Obtaining the total number of cycles of the battery. If the total number of cycles of the obtained battery is 9, the total number of cycles 9 of the obtained battery is compared with the total number of cycles 10, 20, and 30, and the total number of acquired batteries is known. The number of cycles 9 is not equal to any one of the total cycle number thresholds 10, 20, 30, and it is determined that the condition for lowering the charge cutoff voltage of the battery is not reached; if the total number of cycles of the obtained battery is 20, Then, comparing the total number of cycles 20 of the obtained battery with the total cycle number thresholds 10, 20, and 30, the total number of cycles of the obtained battery 20 is equal to the total cycle number threshold 20, and it is determined that the charge cutoff voltage of the battery is lowered. conditions of.

In a specific implementation, the total number of cycles threshold can be set at a fixed cyclic interval. For example, if the total number of cycles of the preset battery is 5, 10, 15, or 20, that is, when the total number of cycles of the battery reaches the 5th cycle, the 10th cycle, the 15th cycle, and the 20th cycle, it is considered to be reached. The condition for lowering the charge cut-off voltage of the battery, at which time, the cycle interval between the preset total number of cycles of adjacent two batteries is 5. Alternatively, it is also possible to set the total cycle number threshold of the battery at an irregular cycle interval. For example, if the total number of cycles of the preset battery is 5, 15, 30, 40, that is, when the total number of cycles of the battery reaches the 5th cycle, the 15th cycle, the 30th cycle, and the 40th cycle, it is considered To the condition of lowering the charge cut-off voltage of the battery, at this time, the cycle interval between the preset total number of cycles of the adjacent two batteries is 10, 20, and 10, respectively. In the embodiment of the present application, the preset rule of the total number of cycles threshold corresponding to the total number of cycles of the battery may be determined according to actual needs, which is not specifically limited in this application.

The example shown in FIG. 3 will be described. Please refer to FIG. 3 , which is a schematic flowchart diagram of Embodiment 2 of a charging method of a battery provided by an embodiment of the present application. As shown in FIG. 3, N is the total number of cycles of the obtained battery, and the preset total number of cycles has n thresholds, which are respectively N1, N2, ..., Nn. At this time, the obtained N is compared with N1. If N<N1, it is determined that the condition for lowering the charge cutoff voltage of the battery is not satisfied, and the charge cutoff voltage V1 of the battery is kept unchanged; if N=N1, then The condition for lowering the charge cutoff voltage of the battery is satisfied, and the charge cutoff voltage of the battery is adjusted to V2. It can be understood that, in the embodiment of the present application, the charging cutoff voltage of the battery is adjusted from V1 to the charging cutoff voltage V2 at the beginning of the cycle of N=N1. Therefore, when N>N1, the second round of comparison and Judging to determine whether the condition for lowering the charge cutoff voltage of the battery is satisfied again. Therefore, for the loop process of N>N1, it is necessary to judge by the second round of N<N2. If the second round of N<N2 is judged to be YES, the condition for lowering the charge cutoff voltage of the battery again is not satisfied, the battery is The charge cut-off voltage is kept constant at V2 until the total number of cycles of the battery N=N2, and the condition that the cut-off voltage of the battery is lowered again is satisfied, and the charge cut-off voltage of the battery is adjusted from V2 to the charge cut-off voltage V3.

(1B) Specifically, the acquired usage data of the battery may be the number of cycles in which the battery maintains the same charge cutoff voltage.

If the acquired usage data of the battery is the number of cycles in which the battery maintains the same charge cutoff voltage, the number of cycles in which the acquired battery maintains the same charge cutoff voltage can be compared with the corresponding cycle number threshold (ie, the cycle interval threshold). When the obtained battery maintains the same number of cycles of the same charge cutoff voltage equal to the cycle interval threshold, it is detected that the battery use data satisfies the condition of lowering the charge cutoff voltage of the battery.

It should be noted that, in the embodiment of the present application, since the number of cycles of the battery to maintain the same charge cutoff voltage is segmented, the cycle interval threshold of at least one battery may be set in the entire cycle. No particular limitation is imposed.

During the entire cycle of the battery, a cycle interval threshold of one battery can be set, and when the number of cycles of the obtained battery maintaining the same charge cutoff voltage is equal to the cycle interval threshold, the detection is performed. The usage data to the battery satisfies the condition of lowering the charge cutoff voltage of the battery. For example, if the cycle interval threshold of the battery is preset to be 5, the battery is lowered during the entire cycle of the battery as long as the number of cycles in which the battery maintains the same charge cutoff voltage is equal to 5, that is, the condition for lowering the charge cutoff voltage of the battery is satisfied. The operation of the charge cut-off voltage, due to the change in the charge cut-off voltage of the battery, the number of cycles in which the battery maintains the same charge cut-off voltage is cleared, and the count is restarted.

Alternatively, a cycle interval threshold of at least two batteries may also be set during the entire cycle of the battery. For example, if the cycle interval thresholds of the battery are preset to 5 and 10, during the entire cycle of the battery, it is possible to preset the number of cycles in which the acquired battery maintains the same charge cutoff voltage alternately with the cycle interval thresholds 5 and 10. Comparison; or, in at least one round of comparison process, the cycle interval threshold 5 is used to compare the number of cycles in which the battery maintains the same charge cutoff voltage, and the subsequent comparison process uses the cycle interval 10 to maintain the same charge cutoff voltage with the battery. The number of cycles is compared. It is to be understood that this example is for illustrative purposes only and is not intended to limit the application. In the embodiment of the present application, the sequence and the rule that the at least two cycle interval thresholds are respectively compared with the number of cycles in which the battery maintains the same charge cutoff voltage may be set according to actual needs, which is not specifically limited in the embodiment of the present application.

(1C) Specifically, the acquired usage data of the battery may be the total number of cycles of the battery and the number of cycles in which the battery maintains the same charge cutoff voltage.

If the usage data of the obtained battery is the total number of cycles of the battery and the number of cycles in which the battery maintains the same charge cutoff voltage, it is necessary to compare the total number of cycles of the obtained battery with the total cycle number threshold of the battery, and The number of cycles in which the battery maintains the same charge cut-off voltage is compared with the cycle interval threshold of the battery. If the total number of cycles of the battery is equal to the total cycle number threshold and the number of cycles in which the battery maintains the same charge cutoff voltage is equal to at least the cycle interval threshold One, detecting the usage data of the battery satisfies the condition of lowering the charge cutoff voltage of the battery.

For example, if the total number of cycles of the battery is preset to be 8 and 28, and the cycle threshold of the battery is preset to be 10. During the battery cycle, the count of the total number of battery cycles and the segmentation of the battery can be simultaneously performed by the cycle counter. If the total number of cycles of the battery is 8, by comparing with the total cycle number threshold 8, it is judged that the condition for lowering the charge cutoff voltage of the battery is satisfied, and at this time, the charge cutoff voltage of the battery is lowered, and the charge cutoff voltage of the battery changes. , the second segment count is started, the cycle of the total number of cycles of the battery is 9, which is the first cycle of the second segment count; when the total number of cycles of the battery is 18, the second segment count of the battery is obtained. Battery keeps the same charge The number of cycles of the stop voltage is equal to the cycle interval threshold of 10, and it is judged that the condition for lowering the charge cutoff voltage of the battery is satisfied. At this time, the charge cutoff voltage of the battery is lowered, and the third segmentation is started due to the change of the charge cutoff voltage of the battery. Counting, the total number of cycles of the battery is 19, which is the first cycle of the third segment count; when the total number of cycles of the battery is 28, the battery obtained by the third segment count of the battery maintains the same charge cutoff voltage. The number of cycles is equal to the cycle interval threshold 10, and the total number of cycles of the battery is equal to the total cycle number threshold 28 of the battery, and it is judged that the condition for lowering the charge cutoff voltage of the battery is satisfied. Therefore, during the complete cycle of the battery, it can be detected that the battery satisfies the condition of lowering the charge cutoff voltage of the battery when the total number of cycles is the 8th cycle, the 18th cycle, and the 28th cycle.

In a specific implementation process, when the cycle number threshold of the battery is preset, including the total cycle number threshold of the preset battery and the cycle interval threshold of the preset battery, the temperature of the battery may also be considered, and the temperature of the battery may include but is not limited to At least one of the ambient temperature and the cell temperature at which the battery is exposed for a long period of time.

Specifically, the battery may be divided into at least two temperature segments according to the temperature of the battery, and a corresponding battery cycle number threshold is set for each temperature segment, and then the temperature segment corresponding to the current temperature of the battery is determined according to the current temperature of the battery, thereby A threshold number of cycles of the battery is determined based on the determined temperature range. It can be understood that, when the corresponding battery cycle number threshold is set for each temperature segment, a specific value may be set as the battery cycle number threshold, or a numerical range may be set, so as to select the value range according to actual needs. A certain value is used as the threshold number of cycles of the battery, which is not specifically limited in the present application.

The cycle interval threshold value in which the predetermined battery is kept at the same charge cutoff voltage is described as an example. The temperature can be divided into two temperature segments according to the ambient temperature at which the battery is long-term, for example, a temperature greater than 40 ° C is divided into a high temperature segment; a temperature ranging from 15 ° C to 35 ° C is divided into a low temperature segment. Then, a corresponding cycle interval threshold is set for each of the high temperature section and the low temperature section. At least one value range can be set for the high temperature section. Since the electrolyte reacts more strongly with the cathode and anode surfaces at higher temperatures, and the electrolyte consumption speed is faster, a small cycle interval threshold can be set for the high temperature section, such as the battery. A cycle interval threshold ranges from 15 to 100, and each subsequent cycle interval threshold ranges from 100 to 600. When at least one value range can be set for the low temperature section, since the temperature is low, a relatively large temperature interval threshold can be set for the low temperature section, for example, the first cycle interval threshold of the battery ranges from 100 to 200, and thereafter The range of each cycle interval threshold is 200 to 800. Therefore, when the current temperature of the battery is determined, the temperature segment corresponding to the current temperature can be determined, and further, according to the determined In the temperature segment, the cycle number interval of the battery is set within a threshold range of the number of cycles corresponding to the temperature segment.

In a specific implementation process, when the number of cycles of the battery is obtained, the temperature of the battery can be obtained by the temperature sensor, which is not specifically limited in the embodiment of the present application.

In a specific implementation process, due to the frequent reduction of the charge cut-off voltage, the loss of battery capacity and battery energy will also increase, which is not conducive to the maintenance of battery capacity and battery energy, so the cycle interval threshold of the battery can be Set to a gradually increasing trend, such as set to 5, 12, 25, 40, and/or, set the cycle number interval between the total cycle number thresholds of the battery to a gradually increasing trend to maintain battery capacity and battery energy.

Second: If the acquired usage data of the battery is the accumulated time of the battery, the accumulated time of the battery is compared with the corresponding accumulated time threshold to determine whether the condition for lowering the charge cutoff voltage of the battery is satisfied. Hereinafter, the cumulative time of the battery will be described in units of months.

In the embodiment of the present application, the acquired usage data of the battery may be at least one of a total accumulated time of the battery in the accumulated time of the battery and a cumulative time when the battery maintains the same charging cutoff voltage. That is, the acquired usage data of the battery is the accumulated time of the battery, and may include but is not limited to the following three cases:

(2A) Specifically, the acquired battery usage data may be the total accumulated time of the battery.

If the acquired usage data of the battery is the total accumulated time of the battery, the total accumulated time of the obtained battery may be compared with the corresponding accumulated time threshold (ie, the total accumulated time threshold), if the accumulated time of the obtained battery is obtained. Equal to the total accumulated time threshold, the battery usage data is detected to satisfy the condition of lowering the charge cutoff voltage of the battery.

It should be noted that, in the embodiment of the present application, the total accumulated time threshold of at least one battery may be set, which is not specifically limited in this embodiment of the present application. For example, the total accumulated time threshold of the battery can be set to T1, T2, ... Tn, where n is an integer greater than zero. When comparing the total accumulated time of the obtained battery with the total accumulated time threshold, only when the total accumulated time of the acquired battery is equal to one of the preset total accumulated time thresholds, that is, the total accumulated time threshold is determined. The total accumulated time of the obtained battery is equal to the total accumulated time threshold, and the use data of the battery is detected to satisfy the condition of lowering the charge cutoff voltage of the battery.

For example, suppose that the total accumulated time threshold corresponding to the total accumulated time of the battery is preset to be 10, 20, 30, that is, when the total accumulated time of the battery reaches the 10th month, the 20th month, and the 30th month, It is considered that the condition for lowering the charge cutoff voltage of the battery is achieved. Get the total accumulated time of the battery, if obtained The total accumulated time of the battery is 9, and the total accumulated time 9 of the obtained battery is compared with the total accumulated time thresholds 10, 20, and 30, and the total accumulated time 9 of the obtained battery is not equal to the total accumulated time threshold 10 The total accumulated time threshold of any one of 20, 30, at this time, it is judged that the condition for lowering the charge cutoff voltage of the battery is not reached; if the total accumulated time of the obtained battery is 20, the total accumulated time of the obtained battery will be obtained. Comparing with the total accumulated time thresholds 10, 20, and 30, it can be seen that the total accumulated time 20 of the obtained battery is equal to the total accumulated time threshold 20, and it is judged that the condition for lowering the charge cutoff voltage of the battery is reached.

In a specific implementation, the total accumulated time threshold can be set at a fixed cumulative time interval. For example, if the total accumulated time threshold of the preset battery is 5, 10, 15, or 20, that is, when the total accumulated time of the battery reaches the 5th, 10th, 15th, and 20th months, it is considered to be reached. The condition for lowering the charge cutoff voltage of the battery, at this time, the cumulative time interval between the preset total accumulated time thresholds of the adjacent two batteries is 5. Alternatively, it is also possible to set the total accumulated time threshold of the battery at an unfixed cumulative time interval. For example, if the total accumulated time threshold of the preset battery is 5, 15, 30, 40, that is, when the total accumulated time of the battery reaches the 5th, 15th, 30th, and 40th months, it is considered to be reached. The condition for lowering the charge cutoff voltage of the battery, at this time, the cumulative time interval between the preset total accumulated time thresholds of the adjacent two batteries is 10, 20, and 10, respectively. In the embodiment of the present application, the preset rule of the total accumulated time threshold corresponding to the total accumulated time of the battery may be determined according to actual needs, which is not specifically limited in this application.

(2B) Specifically, the acquired usage data of the battery may be an accumulated time when the battery maintains the same charge cutoff voltage.

If the acquired usage data of the battery is the accumulated time when the battery maintains the same charging cutoff voltage, the accumulated time of the obtained battery to maintain the same charging cutoff voltage may be compared with the corresponding accumulated time threshold (ie, the accumulated time interval threshold). If the accumulated time at which the acquired battery maintains the same charge cutoff voltage is equal to the cumulative time interval threshold, the detected use data of the battery satisfies the condition for lowering the charge cutoff voltage of the battery.

It should be noted that, in the embodiment of the present application, since the accumulated time for the battery to maintain the same charge cutoff voltage is segmented, the cumulative time interval threshold of at least one battery may be set in the entire cycle. This is not particularly limited.

During the entire cycle of the battery, a cumulative time interval threshold of the battery may be set, and the accumulated time when the acquired battery maintains the same charge cutoff voltage is equal to the cumulative time interval threshold. At the time, the battery usage data is detected to satisfy the condition of lowering the charge cutoff voltage of the battery. For example, if the cumulative time interval threshold of the battery is preset to be 5, as long as the accumulated time of the battery maintaining the same charge cutoff voltage is equal to 5 during the entire cycle of the battery, the condition for lowering the charge cutoff voltage of the battery is satisfied, and the reduction is performed. The operation of the charge cut-off voltage of the battery, due to the change of the charge cut-off voltage of the battery, the accumulated time of the battery maintaining the same charge cut-off voltage is cleared, and the timing is restarted.

Alternatively, a cumulative time interval threshold for at least two batteries may also be set during the entire cycle of the battery. For example, if the cumulative time interval threshold of the battery is preset to be 5 and 10, the accumulated time and accumulated time interval thresholds 5 and 10 for maintaining the obtained battery to maintain the same charge cutoff voltage may be preset during the entire cycle of the battery. The comparison is performed alternately; or, in the at least one round of comparison process, the accumulated time interval threshold 5 is used to compare with the accumulated time that the battery maintains the same charge cutoff voltage, and the subsequent comparison process uses the accumulated time interval 10 and the battery remains. The cumulative time of the same charge cutoff voltage is compared. It is to be understood that this example is for illustrative purposes only and is not intended to limit the application. In the embodiment of the present application, the sequence and the rule that the at least two cumulative time interval thresholds are respectively compared with the accumulated time of the battery to maintain the same charging cutoff voltage may be set according to actual needs, which is not specifically limited in this embodiment of the present application. .

The example shown in FIG. 4 will be described. Please refer to FIG. 4 , which is a schematic flowchart diagram of Embodiment 3 of a charging method of a battery provided by an embodiment of the present application. As shown in FIG. 4, T is the accumulated time of the acquired battery to maintain the same charge cut-off voltage. The preset cumulative time interval threshold has n, which are respectively T1, T2, ..., Tn. At this time, the obtained T is compared with T1. If T<T1, it is determined that the condition for lowering the charge cutoff voltage of the battery is not satisfied, and the charge cutoff voltage V1 of the battery is kept unchanged; if T=T1, then The condition for lowering the charge cutoff voltage of the battery is satisfied, and the charge cutoff voltage of the battery is adjusted to V2. It can be understood that, in the embodiment of the present application, at the time of T=T1, the charge cutoff voltage of the battery is adjusted from V1 to the charge cutoff voltage V2, the timing is cleared and the timing is restarted, so there is no T>T1. Happening. Thereafter, after the start of the second round of the segment timing, the accumulated time T of the obtained battery holding the same charge cutoff voltage is compared with T2 to determine whether the condition for lowering the charge cutoff voltage of the battery is satisfied.

(2C) Specifically, the acquired battery usage data may be the total accumulated time of the battery and the accumulated time when the battery maintains the same charge cutoff voltage.

If the usage data of the obtained battery is the total accumulated time of the battery and the accumulated time of the same charging cutoff voltage of the battery, the total accumulated time of the obtained battery and the total accumulated time of the battery are required. The threshold is compared, and the accumulated time of the obtained battery to maintain the same charge cutoff voltage is compared with the accumulated time interval threshold of the battery, and if the total accumulated time of the battery is equal to the total accumulated time threshold and the battery remains the same charge cutoff The number of accumulated time of the voltage is equal to at least one of the accumulated time interval thresholds, and the use data of the battery is detected to satisfy the condition of lowering the charge cutoff voltage of the battery.

For example, if the total accumulated time threshold of the battery is preset to 8 and 28, and the cumulative time interval threshold of the battery is preset to 10. During the battery cycle, the time totaling time of the battery and the segmentation timing of the battery can be simultaneously performed by the time recorder. If the total accumulated time of the battery is 8, by comparing with the total accumulated time threshold 8, it is judged that the condition for lowering the charge cutoff voltage of the battery is satisfied, and at this time, the charge cutoff voltage of the battery is lowered, and the charge cutoff voltage of the battery changes. , start the second sub-segment timing, the 9th month of the total accumulated battery time is the 1st month of the 2nd sub-time; when the total battery accumulation time is 18, the second sub-time of the battery The accumulated time for maintaining the same charge cutoff voltage is equal to the cumulative time interval threshold value 10, and it is judged that the condition for lowering the charge cutoff voltage of the battery is satisfied. At this time, the charge cutoff voltage of the battery is lowered, and the charge cutoff voltage of the battery changes, and the process starts. In the third sub-segment, the 19th month of the total accumulated battery time is the first month of the 3rd sub-time; when the total accumulated time of the battery is 28, the third sub-time of the battery remains the same. The accumulated time of the charging cutoff voltage is equal to the cumulative time interval threshold 10, and the total accumulated time of the battery is equal to the total accumulated time threshold 28 of the battery, and it is judged that the charging of the reduced battery is satisfied. Voltage cut-off condition. Therefore, if the obtained battery usage data is the total accumulated time of the battery and the accumulated time of the same charging cutoff voltage of the battery, during the complete cycle of the battery, the total accumulated time of the battery can be detected as the 8th month. At the 18th month and the 28th month, the conditions for lowering the charge cut-off voltage of the battery are satisfied.

In a specific implementation process, when the accumulated time threshold of the battery is preset, including the total accumulated time threshold of the preset battery and the accumulated time interval threshold of the preset battery, the temperature of the battery may also be considered, and the temperature of the battery may include but not It is limited to at least one of the ambient temperature and the cell temperature at which the battery is long-term.

Specifically, the battery may be divided into at least two temperature segments according to the temperature of the battery, and a corresponding time threshold of the battery is set for each temperature segment, and then the temperature segment corresponding to the current temperature of the battery is determined according to the current temperature of the battery, thereby A cumulative time threshold for the battery is determined based on the determined temperature range. It can be understood that when the cumulative time threshold of the corresponding battery is set for each temperature segment, the device can be set. The value of the volume is used as the cumulative time threshold of the battery, or a range of values may be set, so that a certain value in the range of values is selected as the cumulative time threshold of the battery according to actual needs, which is not specifically limited in the present application.

The example shows a cumulative time interval threshold value in which the preset battery maintains the same charge cutoff voltage. When the battery temperature is lower than 15 °C, since the cycle performance of the cell is less affected at low temperature, it is not recommended to reduce the cycle of the charge cut-off voltage of the battery; when the battery temperature is higher than 60 °C, the soft-package lithium-ion battery is prone to occur. Flatulence, so it is not recommended for long-term use of soft pack batteries at temperatures above 60 °C. Therefore, the temperature can be divided into two temperature segments in the range of 15 ° C ~ 60 ° C, for example, the temperature range of 35 ° C ~ 60 ° C is divided into high temperature section; temperature range is 15 ° C ~ 35 ° C The temperature is divided into low temperature sections. Then, a corresponding cumulative time interval threshold is set for the high temperature segment and the low temperature segment respectively. For example, the cumulative time interval threshold of the battery can be set to 1 to 8 for the high temperature segment; the range of the cumulative time interval threshold of the battery can be set for the low temperature segment. It is 8 to 18. Therefore, after determining the current temperature of the battery, the temperature segment corresponding to the current temperature can be determined, and further, according to the determined temperature segment, the cumulative time interval threshold of the battery is set within a range of the cumulative time interval threshold corresponding to the temperature segment.

In a specific implementation process, when the cumulative time threshold of the battery is obtained, the temperature of the battery can be obtained by the temperature sensor, which is not specifically limited in the embodiment of the present application.

In a specific implementation process, due to the frequent reduction of the charge cut-off voltage, the loss of battery capacity and battery energy will also increase, which is not conducive to the maintenance of battery capacity and battery energy, so the cumulative time interval of the battery can be The threshold is set to a gradually increasing trend, such as set to 5, 12, 25, 40, and the cumulative time interval between the total accumulated time thresholds of the batteries is set to a gradually increasing trend to maintain battery capacity and battery energy.

The third type: the usage data of the obtained battery is the number of cycles of the battery and the accumulated time of the battery.

Specifically, if the acquired usage data of the battery is the number of cycles of the battery and the accumulated time of the battery, the number of cycles of the battery and the accumulated time of the battery are comprehensively considered, and the number of cycles of the battery is compared with a preset threshold number of cycles. And comparing the accumulated time of the battery with the preset accumulated time threshold. At this time, as long as the number of cycles of the battery is equal to the corresponding number of cycles threshold, and the accumulated time of the battery is equal to at least one of the corresponding accumulated time thresholds, the detection is performed. The battery usage data meets the conditions for lowering the charge cutoff voltage of the battery.

It should be noted that, in the embodiment of the present application, when the acquired usage data of the battery is the number of cycles of the battery and the accumulated time of the battery, since the number of cycles of the battery includes the total number of cycles of the battery and The number of cycles in which the battery maintains the same charge cut-off voltage. The accumulated time of the battery includes the total accumulated time of the battery and the accumulated time of the battery maintaining the same charge cut-off voltage. Therefore, by using the battery usage data, a combination method of at least two methods can be obtained. To determine whether the condition for lowering the charge cut-off voltage of the battery is satisfied. In the combination method using at least two kinds of use data described above, as long as one condition that satisfies the reduction of the charge cutoff voltage of the battery is satisfied, that is, a condition that the charge cutoff voltage of the battery is lowered is detected; and only if all the judgment conditions are not satisfied Only the conditions for lowering the charge cut-off voltage of the battery are not satisfied.

The combination method of 1A and 2B in the above method will be described as an example. Please refer to FIG. 5 , which is a schematic flowchart of Embodiment 4 of a charging method of a battery provided by an embodiment of the present application. As shown in FIG. 5, N is the total number of cycles of the obtained battery, and the preset n total number of cycles thresholds are respectively N1, N2, ..., Nn, and T is the accumulated time of the obtained battery to maintain the same charge cutoff voltage. The preset n cumulative time interval thresholds are T1, T2, ..., Tn, respectively. At this time, the obtained N is compared with N1, and the acquired T is compared with T1. If N<N1 and T<T1 are satisfied at the same time, it is determined that the condition for lowering the charge cutoff voltage of the battery is not satisfied. Then, the charge cutoff voltage V1 of the battery is kept unchanged; if N=N1 and T<T1 are satisfied, at this time, if the judgment of N<N1 is NO, it is determined that the condition for lowering the charge cutoff voltage of the battery is satisfied, and the charge of the battery is cut off. The voltage is adjusted to V2; or, if N<N1 and T=T1 are satisfied, at this time, if the determination of T<T1 is NO, it is determined that the condition for lowering the charge cutoff voltage of the battery is satisfied, and the charge cutoff voltage of the battery is adjusted to V2. Or, if N=N1 and T=T1 are satisfied, at this time, if the determination of N<N1 is NO and the determination by T<T1 is NO, it is determined that the condition for lowering the charge cutoff voltage of the battery is satisfied, and the battery is charged. The cutoff voltage is adjusted to V2.

It is to be understood that the example of FIG. 5 is only a specific implementation process of a combination method in the foregoing combination scheme, and the example is only used to illustrate the solution, and is not intended to limit the application.

S103. If it is detected that the usage data of the battery satisfies the condition for lowering the charge cutoff voltage of the battery, the charge cutoff voltage of the battery is lowered.

Specifically, if it is detected that the usage data of the battery satisfies the condition for lowering the charge cutoff voltage of the battery, the charge cutoff voltage of the battery is lowered to charge the battery according to the charge cutoff voltage of the reduced battery.

In the embodiment of the present application, reducing the charge cutoff voltage of the battery may include, but is not limited to, the following two implementation modes:

The first type: lowers the charge cut-off voltage of the battery according to the preset voltage difference.

Specifically, the voltage difference ΔV may be preset, and ΔV is used to represent the difference between the charge cutoff voltages of the adjacent two batteries. It will be appreciated that ΔV may include, but is not limited to, at least one value. Then, when it is detected that the usage data of the battery satisfies the condition of lowering the charge cutoff voltage of the battery, lowering the charge cutoff voltage of the battery can be realized by subtracting ΔV from the current voltage.

Taking FIG. 2 as an example, if the voltage difference ΔV1, ΔV2, ... ΔVn-1 is preset, the difference between V1 and V2 is ΔV1, and the voltage value of ΔV1 can be subtracted from V1 as the voltage value of V2. The difference between V2 and V3 is ΔV2, and the voltage value of ΔV2 can be subtracted from V2 as the voltage value of V3; and so on, the charge cutoff voltages V1, V2, ..., Vn of the battery are obtained.

Or, for example, if the voltage difference ΔV=ΔV1=ΔV2=...ΔVn-1 is preset, the difference between Vn-1 and Vn is ΔV, and the voltage value of ΔV can be subtracted from V1 as V2. The voltage value is obtained by subtracting the voltage value of ΔV from V2 as the voltage value of V3, and so on, and obtaining the charge cutoff voltages V1, V2, ..., Vn of the battery.

In a specific implementation process, the voltage difference ΔV can be taken in the range of 0.005V to 0.5V; in a preferred implementation, the voltage difference ΔV can range from 0.01V to 0.05V.

It should be noted that, in the embodiment of the present application, as the number of cycles increases and/or the cumulative time increases, the voltage difference ΔV may be set to gradually decrease, thereby avoiding excessive decrease in the charge cutoff voltage of the battery. The problem of a significant reduction in battery capacity.

a second type: a preset charging cutoff voltage candidate set, wherein the charging cutoff voltage candidate set includes at least one candidate voltage; and a candidate voltage lower than a current battery charging cutoff voltage in the charging cutoff voltage candidate set is used as the reduced battery The charge cut-off voltage.

For example, a charge cutoff voltage candidate set of the battery may be preset, and the voltage set may include at least one candidate voltage, such as V1, V2, V3, V4, and V5, when the battery usage data is detected to satisfy the reduced battery charge cutoff. The condition of the voltage, lowering the charge cutoff voltage of the battery, may select a candidate voltage lower than the charge cutoff voltage of the current battery among the candidate voltages V1, V2, V3, V4, V5. If the current battery charge cutoff voltage is V, at this time, V3>V>V4>V2>V1>V5. At this time, one candidate voltage can be selected among the candidate voltages V1, V2, V4, and V5 as the reduced battery. The charge cut-off voltage.

In a preferred implementation, the candidate voltage V4 can be taken as the charge cutoff voltage of the reduced battery, taking into account the range of voltage differences between adjacent two charge cutoff voltages. in a In a specific implementation process, if the environment of the battery or the battery changes, and some possible causes, other candidate voltages lower than the candidate voltage V4 may be selected in the candidate set as the charging cutoff voltage of the reduced battery, and the present invention The embodiment is not particularly limited thereto.

Alternatively, for example, a charge cutoff voltage candidate set of the battery may be preset, and the voltage set may include at least one candidate voltage, such as V1, V2, . . . Vn, and sort the candidate voltages in the candidate set, if V7 >V3>V5>...Vn, when detecting that the battery usage data satisfies the condition of lowering the charge cutoff voltage of the battery, lowering the charge cutoff voltage of the battery may sequentially select one candidate voltage in the charge cutoff voltage candidate set according to the sorting result. As the charge cutoff voltage of the lowered battery. If the charge cutoff voltage at this time is V3, after a certain cycle or accumulation time, it is detected that the condition for lowering the charge cutoff voltage of the battery is satisfied, and then the candidate voltage V3 in the charge cutoff voltage candidate set is selected according to the sort result. V5 is used as the reduced charge cut-off voltage.

Alternatively, for example, a charge cutoff voltage candidate set of the battery may be preset, and the voltage set may include at least one candidate voltage, such as V1, V2, ..., Vn, and determine the value of V1, V2, V3, ..., Vn. The relationship is V1>V2>V3>...Vn. At this time, when the battery usage data is detected to satisfy the condition of lowering the charge cutoff voltage of the battery, the battery can be charged in the order of V1, V2, V3, ..., Vn. The decrease in the cutoff voltage is equivalent to setting a specified value for each time the charge cutoff voltage of the battery is reduced.

It can be understood that the numerical order of the candidate voltages in the candidate set of charging cutoff voltages of the battery may be fixed or unfixed. For example, the charging cutoff voltage candidate set may be V1>V2>V3> . . . Vn, and may be V3>V5>V2> . . . Vn, etc., which is not specifically limited in the embodiment of the present invention. A candidate voltage lower than the current battery charge cutoff voltage in the charge cutoff voltage candidate set of the battery is taken as the charge cutoff voltage of the reduced battery.

In a specific implementation process, the difference between the candidate voltages in the charge cutoff voltage candidate set may be in the range of 0.005V to 0.5V; in a preferred implementation process, the charge cutoff voltage candidate set is included. The difference between the candidate voltages may range from 0.01V to 0.05V.

It should be noted that, in the embodiment of the present application, as the number of cycles increases and/or the cumulative time increases, the difference between the candidate voltages in the charge cutoff voltage candidate set may be set to a gradually decreasing trend, thereby avoiding A significant drop in battery capacity due to excessive reduction in the battery's charge cut-off voltage Low problem.

The charging cut-off voltage of the lithium iron phosphate battery during charging is about 3.7V, the platform voltage is about 3.2V, and the charging cut-off voltage of the lithium-rich material battery during charging is about 4.85V. Therefore, in a specific implementation process, the charge cutoff voltage of the battery during the charging process of the cyclic process may range from 3.0V to 6.0V. Preferably, the charge cutoff voltage of the battery during the charging process of the cyclic process may range from 3.6V to 4.6V.

S104, charging the battery according to the charging cutoff voltage of the reduced battery.

Specifically, please refer to FIG. 3 to FIG. 5, after reducing the charging cut-off voltage of the battery, during the charging process of the battery cycle, charging the battery according to the charging cut-off voltage of the reduced battery, charging the battery to the reduced charging cut-off voltage. The battery is discharged during the discharge of the battery cycle.

In a specific implementation process, the preparation of the lithium ion secondary battery may include the following steps:

(a) Preparation of an initial negative electrode sheet of a lithium ion secondary battery.

The negative electrode active material graphite (gram capacity: 355 mAh/g, first coulombic efficiency: 89%), binder styrene-butadiene rubber, conductive agent conductive carbon black SP (specific surface area BET: 62 m ² /g) was 97.7:1.2:1.1. The ratio (mass ratio) is mixed with the solvent N-methylpyrrolidone (NMP) to form a negative electrode slurry; thereafter, the negative electrode slurry is uniformly coated on the porous current collector copper foil according to a coating weight of 160 mg / 1540 mm ² On both sides of the front and back; then, after drying at 85 ° C to form a negative film, and the water content of the negative film does not exceed 300 ppm; then, cold pressing, trimming, cutting, slitting, welding the negative electrode tab, An initial negative electrode sheet of a lithium ion secondary battery having a width of 108.7 mm was obtained.

(b) Preparation of a positive electrode sheet of a lithium ion secondary battery.

The positive electrode active material lithium cobaltate (LiCoO ₂ ), the binder polyvinylidene fluoride (PVDF), and the conductive agent conductive carbon black SP (specific surface area BET was 62 m ² /g) in a ratio of 96.7:1.7:1.6 (mass ratio) ), dissolved in a solvent N-methylpyrrolidone (NMP), and uniformly stirred to form a positive electrode slurry; then, the positive electrode slurry is uniformly coated on both the front and back surfaces of the positive electrode current collector aluminum foil; thereafter, at 85 ° C After drying, a 111 μm thick positive electrode film was obtained; after that, the positive electrode tab of the lithium ion secondary battery was obtained by cold pressing, slicing, slitting, and welding the positive electrode tab.

(c) Preparation of an electrolyte of a lithium ion secondary battery.

A solution prepared by mixing a lithium salt (LiPF ₆ ) and a non-aqueous organic solvent in a ratio of 8:92 (mass ratio) as an electrolyte of a lithium ion secondary battery; wherein, ethylene carbonate (EC), diethyl carbonate is used (DEC), ethyl methyl carbonate (EMC), and vinylene carbonate (VC) were prepared in a ratio of 8:85:5:2 (mass ratio) to a nonaqueous organic solvent.

(d) Preparation of a lithium ion secondary battery.

After the positive electrode sheet, the separator (PE film), and the lithium-rich negative electrode sheet were wound, a bare cell was obtained. Thereafter, the battery was sealed, injected with an electrolyte, and formed into a lithium ion secondary battery.

Specifically, in the embodiment of the present application, the performance test of the lithium ion secondary battery is performed according to the technical solution of the present application, and the performance test of the lithium ion secondary battery is performed by using the prior art to explain the technical effects of the present application.

Please refer to FIG. 6 , which is a first comparison diagram of the cycle curve obtained in the embodiment of the present application and the cycle curve obtained in the prior art. 6 is a test of a lithium ion secondary battery using the technical solution of the present application at a battery ambient temperature of 45 ° C, and testing of a lithium ion secondary battery using the prior art. As shown in FIG. 6, curve 1 is a cycle curve obtained in the embodiment of the present application, and curve 2 is a cycle curve obtained in the prior art.

When the lithium ion secondary battery is tested at the battery ambient temperature of 45 ° C using the technical solution of the present application, the battery is discharged to 3.0 V with 0.5 C, after 30 minutes of dormancy, 0.5 C constant current is charged to 4.4 V, and then constant voltage is applied. 4.4V charge to current reduced to 0.05C, dormancy 19.5 hours, cycle 23 times. Then, a voltage drop is performed, and the voltage is reduced by 0.05V. The battery was discharged to 3.0 V with 0.5 C in a 45 ° C environment. After 30 minutes of dormancy, 0.5 C constant current was charged to 4.35 V, and then charged at a constant voltage of 4.35 V until the current was reduced to 0.05 C, and the sleep was 19.5 hours, and the cycle was 45 times. Then, a voltage drop is performed again, and the voltage is reduced by 0.05V. The battery was discharged to 3.0 V with 0.5 C in a 45 ° C environment. After 30 minutes of dormancy, a 0.5 C constant current was charged to 4.3 V, and then a constant voltage of 4.3 V was charged until the current was reduced to 0.05 C, and the dormancy was 19.5 hours, and the cycle was 68 times. The total number of cycles is 136.

When the lithium ion secondary battery was tested using the prior art at a battery ambient temperature of 45 ° C, the battery was discharged to 3.0 V with 0.5 C, after 30 minutes of dormancy, 0.5 C constant current was charged to 4.4 V, and then constant voltage was 4.4. V charge to current is reduced to 0.05 C, dormancy is 19.5 hours, and the number of cycles is 136.

As shown in FIG. 6, at the battery ambient temperature of 45 ° C, the cycle curve obtained by testing the lithium ion secondary battery using the prior art and the technical solution of the present application was consistent at the first 23 cycles. In the 24th cycle, the capacity retention rate of the battery has a stepwise decrease due to the decrease of the charge cutoff voltage in the technical solution of the present application. The capacity retention rate of the battery in the embodiment of the present application is lower than the cycle curve obtained by using the prior art. Capacity retention rate in . In the 24th to 68th cycles, the slope of the cycle curve obtained using the technical solution of the present application is higher than the cycle curve obtained by using the prior art. The slope of the cycle is small, even at the 68th cycle, the cycle curve obtained using the technical solution of the present application substantially coincides with the cycle curve obtained using the prior art. At the 69th cycle, the technical solution of the present application once again adjusts the charge cutoff voltage of the battery once, and the charge cutoff voltage is lowered by 0.05V. When the cycle was cycled to the 95th cycle, the cycle curve obtained by the prior art showed a large drop, and the slope of the cycle curve obtained using the technical solution of the present application did not change significantly. After that, the improvement of the battery capacity retention rate is more obvious by using the technical solution of the present application. At the 136th cycle, the capacity retention rate of the test battery has been reduced to 55% using the prior art, and the capacity retention rate of the battery is greater than 75% using the technical solution of the present application.

Please refer to FIG. 7 , which is a second comparison diagram of the cycle curve obtained in the embodiment of the present application and the cycle curve obtained in the prior art. 7 is a test of a lithium ion secondary battery using the technical solution of the present application at a battery ambient temperature of 25 ° C, and testing of a lithium ion secondary battery using the prior art. As shown in FIG. 7, curve 1 is a cycle curve obtained in the embodiment of the present application, and curve 2 is a cycle curve obtained in the prior art.

When the lithium ion secondary battery is tested at the battery ambient temperature of 25 ° C using the technical solution of the present application, the battery is discharged to 3.0 V with 0.5 C, and after 10 minutes of sleep, the constant current is charged to 4.4 V at 0.5 C, and then constant voltage is applied. 4.4V charging until the current is reduced to 0.05C, dormant for 10 minutes, cycle 150 times. Then, a voltage drop is performed, and the voltage is reduced by 0.05V. The battery was discharged to 3.0 V with 0.5 C in a 25 ° C environment. After 10 minutes of dormancy, 0.5 C constant current was charged to 4.35 V, and then charged at a constant voltage of 4.35 V until the current was reduced to 0.05 C, dormant for 10 minutes, and cycled 850 times. The total number of cycles is 1000. Only one voltage reduction operation was performed in the entire cycle overcharge.

When the lithium ion secondary battery was tested using the prior art at a battery ambient temperature of 25 ° C, the battery was discharged to 3.0 V with 0.5 C, after 10 minutes of dormancy, 0.5 C constant current was charged to 4.4 V, and then constant voltage was 4.4. V is charged until the current is reduced to 0.05 C, sleep is 10 minutes, and the number of cycles is 1000.

As shown in Fig. 7, at the battery ambient temperature of 25 ° C, the cycle curve obtained using the prior art at the first 150 cycles is consistent with the cycle curve obtained using the technical solution of the present application. In the 151th cycle, the capacity retention rate of the battery has a stepwise decrease due to the decrease of the charge cutoff voltage in the technical solution of the present application. The capacity retention rate of the battery in the embodiment of the present application is lower than the cycle curve obtained by using the prior art. Capacity retention rate in . Thereafter, the slope of the cycle curve obtained using the technical solution of the present application is smaller than the slope of the cycle curve obtained using the prior art. Between the 500th cycle and the 850th cycle, the cycle curve obtained by using the technical solution of the present application is gradually higher than that obtained by using the prior art. The cycle curve to. When the battery is cycled to the 1000th cycle, the capacity retention rate of the battery in the cycle curve obtained by using the prior art has been reduced to about 65%, and the capacity retention rate/energy retention rate of the battery is still greater than 78% in the technical solution of the present application. .

Please refer to FIG. 8 , which is a third comparison diagram of the cycle curve obtained by the embodiment of the present application and the cycle curve obtained by the prior art. As shown in FIG. 8, curve 1 is a cycle curve obtained in the embodiment of the present application, and curve 2 is a cycle curve obtained in the prior art. In the embodiment of the present application, each time the charge cutoff voltage of the battery is lowered, the capacity of the battery is instantaneously decreased, and the cycle retention graph of the capacity retention rate and the number of cycles in the curve 1 is a stepwise decrease of the capacity retention rate, as shown in the figure. The ΔR shown in FIG. 8 has a tendency to decrease the cycle curve due to a decrease in the charge cutoff voltage, the absolute value of the slope becomes small, and the capacity retention rate of the battery decreases at a slower speed than that of the prior art. The cycle life is extended.

It can be understood that, in the embodiment of the present application, as shown in FIG. 8, the value of the difference ΔR between the capacity retention ratios of the batteries is related to the value of the difference ΔV between the charge cutoff voltages. In a specific implementation process, the difference ΔR between the capacity retention ratios of the batteries can be varied between 0.2% and 10%.

It should be noted that the energy retention rate of the battery maintains the same change rule as the capacity retention rate of the battery. In the technical solution of the present application, each time the battery charge cutoff voltage is lowered, the energy of the battery is instantaneously decreased, which is manifested in the energy retention rate and The cycle graph of the number of cycles is a stepwise decrease in the energy retention rate. Due to the decrease in the charge cut-off voltage, the tendency of the cycle curve of the energy retention rate and the number of cycles to decrease becomes gentler, the absolute value of the slope becomes smaller, and the energy retention rate of the battery decreases, and the battery is slower than the prior art. The cycle life is extended.

In the technical solution of the present application, the usage data of the battery is obtained, wherein the usage data of the battery includes at least one of the number of cycles of the battery and the accumulated time of the battery, and then, detecting whether the usage data of the battery satisfies the condition for lowering the charge cutoff voltage of the battery If it is detected that the usage data of the battery satisfies the condition of lowering the charge cutoff voltage of the battery, and lowering the charge cutoff voltage of the battery, the battery can be charged according to the reduced charge cutoff voltage of the battery. According to the technical solution of the present application, it is judged whether the condition for lowering the charge cutoff voltage of the battery is reached, and the charge cutoff voltage of the battery is lowered when the condition for lowering the charge cutoff voltage of the battery is reached, thereby avoiding a higher charge cutoff voltage. The resulting cathode potential is too high, thereby accelerating the destruction of the crystal form of the cathode material And the problem of oxidative decomposition of the electrolyte, avoiding the high irreversible energy loss caused by the battery under high pressure for a long time, and the impact on the overall performance of the battery. Compared with the prior art, the technical solution of the present application can slow down the battery capacity retention rate and the battery energy retention rate, effectively prolong the life of the rechargeable battery, and solve the charging cutoff voltage of the battery in the prior art. The problem of shortening the service life of the battery caused by the higher.

Embodiment 2

The embodiment of the present application further provides an apparatus embodiment for implementing the steps and methods in the foregoing method embodiments. Please refer to FIG. 9 , which is a functional block diagram of a charging device for a battery according to an embodiment of the present application. As shown in Figure 9, the device includes:

The obtaining unit 91 is configured to acquire usage data of the battery, where the usage data of the battery includes at least one of a number of cycles of the battery and a cumulative time of the battery;

The detecting unit 92 is configured to detect whether the usage data of the battery satisfies a condition for reducing a charging cutoff voltage of the battery;

The adjusting unit 93 is configured to reduce the charging cutoff voltage of the battery if the usage data of the battery is detected to satisfy the condition of lowering the charging cutoff voltage of the battery;

The charging unit 94 is configured to charge the battery according to the charging cutoff voltage of the reduced battery.

Specifically, in the embodiment of the present application, if the usage data of the battery acquired by the obtaining unit 91 includes the number of cycles of the battery and the accumulated time of the battery, the detecting unit 92 is specifically configured to:

Comparing the obtained number of cycles of the battery with a preset number of cycles threshold, and comparing the accumulated time of the obtained battery with a preset accumulated time threshold;

If it is satisfied that the number of cycles of the battery is equal to at least one of the preset number of cycles threshold and the accumulated time of the battery is equal to the preset accumulated time threshold, the detected usage data of the battery satisfies the condition for lowering the charge cutoff voltage of the battery.

In the embodiment of the present application, the number of cycles of the battery includes at least one of a total number of cycles of the battery and a number of cycles in which the battery maintains the same charge cutoff voltage.

In the embodiment of the present application, the accumulated time of the battery includes at least one of a total accumulated time of the battery and a cycle cumulative time at which the battery maintains the same charge cutoff voltage.

Specifically, in the embodiment of the present application, if the usage data of the battery acquired by the obtaining unit 91 is the number of cycles of the battery, the detecting unit 92 is specifically configured to:

If the number of cycles of the battery is the total number of cycles of the battery or the number of cycles in which the battery maintains the same charge cutoff voltage, the number of cycles of the obtained battery is compared with a corresponding cycle number threshold;

If the number of cycles of the battery is equal to the corresponding number of cycles threshold, the battery usage data is detected to satisfy the condition of lowering the charge cutoff voltage of the battery.

If the number of cycles of the battery is the total number of cycles of the battery and the number of cycles in which the battery maintains the same charge cutoff voltage, the total number of cycles of the obtained battery is compared with the corresponding cycle number threshold, and the battery is maintained at the same charge cutoff voltage. The number of cycles is compared with the corresponding number of cycles threshold;

If the total number of cycles of the battery is equal to the corresponding cycle number threshold and the number of cycles of the battery maintaining the same charge cutoff voltage is equal to at least one of the corresponding cycle number thresholds, detecting that the battery usage data satisfies the condition of lowering the charge cutoff voltage of the battery .

Specifically, in the embodiment of the present application, if the usage data of the battery acquired by the obtaining unit 91 is the accumulated time of the battery, the detecting unit 92 is specifically configured to:

If the accumulated time of the battery is the total accumulated time of the battery or the accumulated time of the same charging cutoff voltage of the battery, the accumulated time of the obtained battery is compared with the corresponding accumulated time threshold;

If the accumulated time of the battery is equal to the corresponding accumulated time threshold, the battery usage data is detected to satisfy the condition of lowering the charge cutoff voltage of the battery.

If the accumulated time of the battery is the total accumulated time of the battery and the accumulated time of the same charging cutoff voltage of the battery, the total accumulated time of the obtained battery is compared with the corresponding accumulated time threshold, and the battery is kept at the same charging cutoff voltage. The accumulated time is compared with the corresponding accumulated time threshold;

If the total accumulated time of the battery is equal to the corresponding accumulated time threshold and the accumulated time of the same holding charge cutoff voltage of the battery is equal to at least one of the corresponding accumulated time thresholds, detecting that the use data of the battery satisfies the condition of lowering the charge cutoff voltage of the battery .

Specifically, in the embodiment of the present application, the adjusting unit 93 is specifically configured to:

Decreasing the charge cut-off voltage of the battery according to a preset voltage difference; or

The preset charge cutoff voltage candidate set includes at least one candidate voltage in the charge cutoff voltage candidate set; and a candidate voltage lower than the charge cutoff voltage of the battery in the charge cutoff voltage candidate set is used as the charge cutoff voltage of the reduced battery.

Specifically, in the embodiment of the present application, the obtaining unit 91 is specifically configured to:

Obtaining a number of times that the battery performs a charging process and performing a discharging process as a number of cycles of the battery; or

Obtaining a number of times that a maximum voltage of the battery is greater than or equal to a charging upper limit voltage and a minimum voltage of the battery is less than or equal to a lower discharge voltage as a number of cycles of the battery; or

Obtaining a number of times that the maximum remaining power of the battery is greater than or equal to the remaining power corresponding to the charging upper limit voltage and the minimum remaining power of the battery is less than or equal to the remaining power corresponding to the lower limit voltage of the battery as the number of cycles of the battery.

In the embodiment of the present application, the detecting unit 92 is further configured to:

Dividing at least two temperature segments according to the temperature of the battery, and setting a corresponding battery cycle number threshold and/or a battery cumulative time threshold for each temperature segment;

Based on the temperature segment, a threshold number of cycles of the battery and/or a cumulative time threshold of the battery are determined.

Since the units in this embodiment can perform the method shown in FIG. 1, and the parts not described in detail in this embodiment, reference may be made to the related description of FIG.

Embodiment 3

The embodiment of the present application further provides a battery system. Please refer to FIG. 10 , which is a functional block diagram of a battery system according to an embodiment of the present application.

As shown in FIG. 10, the battery system includes a battery 101 and a charging device 102 of the above battery.

Please refer to FIG. 11 , which is a schematic diagram of Embodiment 1 of a battery system according to an embodiment of the present application. As shown in FIG. 11 , the battery system includes a battery, a battery charging device, a temperature sensor, a loop counter, an ammeter, and a voltage. Meter, current source and voltage source.

Specifically, the schematic diagram of the battery system shown in FIG. 11 corresponds to the schematic diagram of the second embodiment of the charging method of the battery shown in FIG.

In a specific implementation process, as shown in FIG. 11, an ammeter in the battery system is used to monitor the charging current of the battery during charging and transmit the monitoring result to the charging device of the battery of the battery system. A voltmeter in the battery system for measuring the voltage across the battery. A cycle counter in the battery system for receiving a voltage signal transmitted from the voltmeter and transmitting the number of cycles of the battery to the charging device of the battery. A temperature sensor in the battery system for measuring the temperature of the battery. A current source in the battery system for providing a controlled, constant charging current. a voltage source in the battery system for providing a controlled constant charging voltage

It can be understood that, in the battery system shown in FIG. 11, the connection manner of the galvanometer, the voltmeter, the temperature sensor, the cycle counter, the current source, the voltage source, the battery, and the charging device of the battery is only a specific implementation manner. It is not intended to limit the invention.

Please refer to FIG. 12 , which is a schematic diagram of Embodiment 2 of a battery system according to an embodiment of the present application. As shown in FIG. 12 , the battery system includes a battery, a battery charging device, a temperature sensor, a time recorder, and an ammeter. Voltmeter, current source and voltage source.

Specifically, the schematic diagram of the battery system shown in FIG. 12 corresponds to the flow chart of the third embodiment of the charging method of the battery shown in FIG. 4.

In a specific implementation process, as shown in FIG. 12, an ammeter in the battery system is used to monitor the charging current of the battery during charging and transmit the monitoring result to the charging device of the battery of the battery system. A voltmeter in the battery system for measuring the voltage across the battery. A cycle counter in the battery system for receiving a voltage signal transmitted from the voltmeter and transmitting the number of cycles of the battery to the charging device of the battery. A temperature sensor in the battery system for measuring the temperature of the battery. A time recorder in the battery system for receiving a temperature signal transmitted from the temperature sensor and for recording a cumulative time of the battery at different temperature segments, and transmitting the accumulated time information of the battery to the charging device of the battery. A current source in the battery system for providing a controlled, constant charging current. A voltage source in the battery system for providing a controlled, constant charging voltage.

It can be understood that, in the battery system shown in FIG. 12, the connection manner of the galvanometer, the voltmeter, the temperature sensor, the time recorder, the current source, the voltage source, the battery, and the charging device of the battery is only a specific implementation manner. It is not intended to limit the invention.

Please refer to FIG. 13 , which is a schematic diagram of Embodiment 3 of a battery system according to an embodiment of the present application. As shown in FIG. 13 , the battery system includes a battery, a battery charging device, a temperature sensor, a loop counter, a time recorder, and Current meter, voltmeter, current source and voltage source.

Specifically, the schematic diagram of the battery system shown in FIG. 13 corresponds to the flow chart of the fourth embodiment of the charging method of the battery shown in FIG. 5.

In a specific implementation process, as shown in FIG. 13, an ammeter in the battery system is used to monitor the charging current of the battery during charging and transmit the monitoring result to the charging device of the battery of the battery system. A voltmeter in the battery system for measuring the voltage across the battery. A temperature sensor in the battery system for measuring the temperature of the battery and transmitting the measurement result to a charging device of the battery of the battery system. A time recorder in the battery system for receiving a temperature signal transmitted from the temperature sensor and for recording a cumulative time of the battery at different temperature segments, and transmitting the accumulated time information of the battery to the charging device of the battery. A current source in the battery system for providing a controlled, constant charging current. A voltage source in the battery system for providing a controlled, constant charging voltage.

It can be understood that, in the battery system shown in FIG. 13, the connection manner of the galvanometer, the voltmeter, the temperature sensor, the cycle counter, the time recorder, the current source, the voltage source, the battery, and the charging device of the battery is only one specific The implementation is not intended to limit the invention.

For a portion not described in detail in this embodiment, reference may be made to the related description of FIGS. 1 and 9.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed system, apparatus, and method may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner. For example, multiple units or components may be combined. Or it can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.

The above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium. The above software functional unit is stored in a storage medium, including several fingers Some steps of a method for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform the methods described in various embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

The above is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc., which are made within the spirit and principles of the present application, should be included in the present application. Within the scope of protection.

Claims

A charging method for a battery, characterized in that the method comprises:

Obtaining usage data of the battery, the usage data of the battery including at least one of a number of cycles of the battery and a cumulative time of the battery;

Detecting whether the usage data of the battery satisfies a condition for lowering a charge cutoff voltage of the battery;

If it is detected that the usage data of the battery satisfies a condition for lowering a charge cutoff voltage of the battery, reducing a charge cutoff voltage of the battery;

The battery is charged according to the charge cutoff voltage of the battery after the reduction.
The method according to claim 1, wherein if the usage data of the battery includes a number of cycles of the battery and a cumulative time of the battery, detecting whether the usage data of the battery satisfies reducing charging of the battery The conditions for the cutoff voltage include:

Comparing the obtained number of cycles of the battery with a preset cycle number threshold, and comparing the acquired accumulated time of the battery with a preset accumulated time threshold;

If it is satisfied that the number of cycles of the battery is equal to at least one of the preset number of cycles threshold and the accumulated time of the battery is equal to the preset accumulated time threshold, detecting that the usage data of the battery satisfies the reduction of the battery The condition of the charge cutoff voltage.
The method according to claim 1 or 2, wherein the number of cycles of the battery comprises at least one of a total number of cycles of the battery and a number of cycles in which the battery maintains the same charge cutoff voltage.
The method according to claim 1 or 2, wherein the accumulated time of the battery comprises at least one of a total accumulated time of the battery and a cumulative time of the battery maintaining the same charge cutoff voltage.
The method according to claim 3, wherein the usage data of the battery is a number of cycles of the battery, and detecting whether the usage data of the battery satisfies a condition for reducing a charge cutoff voltage of the battery comprises:

If the number of cycles of the battery is the total number of cycles of the battery or the number of cycles in which the battery maintains the same charge cutoff voltage, the obtained number of cycles of the battery is compared with a corresponding cycle number threshold;

If the number of cycles of the battery is equal to a corresponding number of cycles threshold, the use of the battery is detected The data satisfies the condition of lowering the charge cutoff voltage of the battery.
The method according to claim 3, wherein the usage data of the battery is a number of cycles of the battery, and detecting whether the usage data of the battery satisfies a condition for reducing a charge cutoff voltage of the battery comprises:

If the number of cycles of the battery is the total number of cycles of the battery and the number of cycles in which the battery maintains the same charge cutoff voltage, the total number of cycles of the obtained battery is compared with a corresponding cycle number threshold, and Comparing the number of cycles in which the battery maintains the same charge cutoff voltage with a corresponding cycle number threshold;

If it is satisfied that the total number of cycles of the battery is equal to the corresponding cycle number threshold and the number of cycles of the battery maintaining the same charge cutoff voltage is equal to at least one of the corresponding cycle number thresholds, detecting that the battery usage data satisfies the reduction The condition of the charge cutoff voltage of the battery.
The method according to claim 4, wherein the usage data of the battery is a cumulative time of the battery, and detecting whether the usage data of the battery satisfies a condition for reducing a charge cutoff voltage of the battery comprises:

If the accumulated time of the battery is the total accumulated time of the battery or the accumulated time of the battery maintaining the same charging cutoff voltage, the accumulated time of the obtained battery is compared with the corresponding accumulated time threshold;

If the accumulated time of the battery is equal to the corresponding accumulated time threshold, detecting that the usage data of the battery satisfies the condition of lowering the charge cutoff voltage of the battery.
The method according to claim 4, wherein the usage data of the battery is a cumulative time of the battery, and detecting whether the usage data of the battery satisfies a condition for reducing a charge cutoff voltage of the battery comprises:

If the accumulated time of the battery is the total accumulated time of the battery and the accumulated time of the same charging cutoff voltage of the battery, the total accumulated time of the obtained battery is compared with a corresponding accumulated time threshold, and Comparing the accumulated time of the battery to the same charge cutoff voltage and the corresponding accumulated time threshold;

If it is satisfied that the total accumulated time of the battery is equal to the corresponding accumulated time threshold and the accumulated time of the battery maintaining the same charging cutoff voltage is equal to at least one of the corresponding accumulated time thresholds, detecting that the usage data of the battery satisfies the lowering The condition of the charge cutoff voltage of the battery.
The method of claim 1 wherein if the use of the battery is detected The data satisfies the condition of lowering the charge cutoff voltage of the battery, and reduces the charge cutoff voltage of the battery, including:

Decreasing the charge cutoff voltage of the battery according to a preset voltage difference; or

a preset charge cutoff voltage candidate set, wherein the charge cutoff voltage candidate set includes at least one candidate voltage; and a candidate voltage lower than a charge cutoff voltage of the battery in the charge cutoff voltage candidate set is used as the reduced battery The charge cut-off voltage.
The method according to claim 1 or 2 or 3 or 5 or 6, wherein the method further comprises:

Obtaining a number of times that the battery performs a charging process and performing a discharging process as a number of cycles of the battery; or

Obtaining a number of times that a maximum voltage of the battery is greater than or equal to a charging upper limit voltage and a minimum voltage of the battery is less than or equal to a lower discharge voltage as a number of cycles of the battery; or

Obtaining a number of times that the maximum remaining power of the battery is greater than or equal to the remaining power corresponding to the charging upper limit voltage and the minimum remaining power of the battery is less than or equal to the remaining power corresponding to the lower limit voltage of the battery as the number of cycles of the battery.
The method according to claim 2 or 5 or 6 or 7 or 8, wherein the method further comprises:

Dividing at least two temperature segments according to a temperature of the battery, and setting a corresponding cycle number threshold of the battery and/or a cumulative time threshold of the battery for each temperature segment;

Determining a temperature segment corresponding to a current temperature of the battery according to a current temperature of the battery;

A threshold number of cycles of the battery and/or a cumulative time threshold of the battery is determined based on the temperature segment.
A charging device for a battery, characterized in that the device comprises:

An obtaining unit, configured to acquire usage data of a battery, where usage data of the battery includes at least one of a number of cycles of the battery and a cumulative time of the battery;

a detecting unit, configured to detect whether the usage data of the battery satisfies a condition for reducing a charging cutoff voltage of the battery;

a adjusting unit, configured to reduce a charging cutoff voltage of the battery if the usage data of the battery is detected to satisfy a condition for lowering a charging cutoff voltage of the battery;

And a charging unit configured to charge the battery according to a charge cutoff voltage of the battery after the reduction.
The apparatus according to claim 12, wherein the detecting unit is specifically configured to: if the usage data of the battery acquired by the acquiring unit includes a number of cycles of the battery and a cumulative time of the battery, :

Comparing the obtained number of cycles of the battery with a preset cycle number threshold, and comparing the acquired accumulated time of the battery with a preset accumulated time threshold;

If it is satisfied that the number of cycles of the battery is equal to at least one of the preset number of cycles threshold and the accumulated time of the battery is equal to the preset accumulated time threshold, detecting that the usage data of the battery satisfies the reduction of the battery The condition of the charge cutoff voltage.
The apparatus according to claim 12 or 13, wherein the number of cycles of the battery includes at least one of a total number of cycles of the battery and a number of cycles in which the battery maintains the same charge cutoff voltage.
The apparatus according to claim 12 or 13, wherein the accumulated time of the battery includes at least one of a total accumulated time of the battery and a cycle cumulative time at which the battery maintains the same charge cutoff voltage.
The device according to claim 14, wherein if the usage data of the battery acquired by the acquiring unit is the number of cycles of the battery, the detecting unit is specifically configured to:

If the number of cycles of the battery is the total number of cycles of the battery or the number of cycles in which the battery maintains the same charge cutoff voltage, the obtained number of cycles of the battery is compared with a corresponding cycle number threshold;

If the number of cycles of the battery is equal to the corresponding number of cycles threshold, the usage data of the battery is detected to satisfy the condition of lowering the charge cutoff voltage of the battery.
The device according to claim 14, wherein if the usage data of the battery acquired by the acquiring unit is the number of cycles of the battery, the detecting unit is specifically configured to:

If the number of cycles of the battery is the total number of cycles of the battery and the number of cycles in which the battery maintains the same charge cutoff voltage, the total number of cycles of the obtained battery is compared with a corresponding cycle number threshold, and Comparing the number of cycles in which the battery maintains the same charge cutoff voltage with a corresponding cycle number threshold;

If the total number of cycles of the battery is satisfied is equal to the corresponding cycle number threshold and the battery retention The number of cycles of the same charge cutoff voltage is equal to at least one of the corresponding cycle number thresholds, and the use data of the battery is detected to satisfy the condition of lowering the charge cutoff voltage of the battery.
The device according to claim 15, wherein the detecting unit is specifically configured to: if the usage data of the battery acquired by the acquiring unit is the accumulated time of the battery,

If the accumulated time of the battery is the total accumulated time of the battery or the accumulated time of the battery maintaining the same charging cutoff voltage, the accumulated time of the obtained battery is compared with the corresponding accumulated time threshold;

If the accumulated time of the battery is equal to the corresponding accumulated time threshold, detecting that the usage data of the battery satisfies the condition of lowering the charge cutoff voltage of the battery.
The device according to claim 15, wherein the detecting unit is specifically configured to: if the usage data of the battery acquired by the acquiring unit is the accumulated time of the battery,

If the accumulated time of the battery is the total accumulated time of the battery and the accumulated time of the same charging cutoff voltage of the battery, the total accumulated time of the obtained battery is compared with a corresponding accumulated time threshold, and Comparing the accumulated time of the battery to the same charge cutoff voltage and the corresponding accumulated time threshold;

If it is satisfied that the total accumulated time of the battery is equal to the corresponding accumulated time threshold and the accumulated time of the battery maintaining the same charging cutoff voltage is equal to at least one of the corresponding accumulated time thresholds, detecting that the usage data of the battery satisfies the lowering The condition of the charge cutoff voltage of the battery.
The device according to claim 12, wherein the adjusting unit is specifically configured to:

Decreasing the charge cutoff voltage of the battery according to a preset voltage difference; or

a preset charge cutoff voltage candidate set, wherein the charge cutoff voltage candidate set includes at least one candidate voltage; and a candidate voltage lower than a charge cutoff voltage of the battery in the charge cutoff voltage candidate set is used as the reduced battery The charge cut-off voltage.
The device according to claim 12 or 13 or 14 or 16 or 17, wherein the obtaining unit is specifically configured to:

Obtaining a number of times that the battery performs a charging process and performing a discharging process as a number of cycles of the battery; or

Obtaining a number of times that a maximum voltage of the battery is greater than or equal to a charging upper limit voltage and a minimum voltage of the battery is less than or equal to a lower discharge voltage as a number of cycles of the battery; or By,

Obtaining a number of times that the maximum remaining power of the battery is greater than or equal to the remaining power corresponding to the charging upper limit voltage and the minimum remaining power of the battery is less than or equal to the remaining power corresponding to the lower limit voltage of the battery as the number of cycles of the battery.
The device according to claim 13 or 16 or 17 or 18 or 19, wherein the detecting unit is further configured to:

Dividing at least two temperature segments according to a temperature of the battery, and setting a corresponding cycle number threshold of the battery and/or a cumulative time threshold of the battery for each temperature segment;

Determining a temperature segment corresponding to a current temperature of the battery according to a current temperature of the battery;

A threshold number of cycles of the battery and/or a cumulative time threshold of the battery is determined based on the temperature segment.
A battery system, characterized in that the battery system comprises a battery and a charging device for the battery according to any one of claims 12-22.