A charging method and device
A charging method and a technology of a charging device, which are applied to circuit devices, battery circuit devices, secondary battery charging/discharging, etc., can solve problems such as shortened service life, increased realization cost, and increased initial design capacity of lithium batteries to achieve extended battery life. The effect of service life
Active Publication Date: 2015-11-25
HUAWEI TECH CO LTD
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Problems solved by technology
According to the d characteristics of lithium batteries, this charging method will speed up the capacity decay of lithium batteries and shorten the service life
Another charging method is to charge the lithium battery to a fixed and lower SOC, such as SOC=80% instead of 100%, which is characterized in that the charging cut-off voltage is fixed lower than the maximum allowed by the lithium battery. A certain charging voltage of the charging voltage, which can reduce the decay speed of the lithium battery capacity and prolong the service life of the lithium battery, but the part of the lithium battery capacity that is not fully charged is not used. If the lithium battery with SOC=100% is to be achieved With the same discharge capacity of the battery, the initial design capacity of the lithium battery needs to be increased, and the cost of implementation will increase
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[0050] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0051] Please refer to figure 1 , is a schematic flow chart of the first embodiment of the charging method of the present invention. In this embodiment, the method includes the following steps:
[0052] S101, detecting the capacity of the lithium battery.
[0053] S102. Calculate a required charging state according to the required electric quantity and the capacity of the lithium battery, and obtain a charging cut-off voltage from a mapping relationship between th...
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The embodiment of the present invention discloses a charging method, including: detecting the capacity of the lithium battery; calculating the required charging state according to the required power and the capacity of the lithium battery, and obtaining the charging cut-off voltage from the mapping relationship between the required charging state and the open circuit voltage ; Charging the lithium battery according to the charging cut-off voltage to ensure that the charging power is greater than or equal to the required power. The embodiment of the invention also discloses a charging device. By adopting the invention, the utilization rate of the capacity of the lithium battery and the service life of the lithium battery can be improved.
Description
technical field [0001] The invention relates to the field of energy technology, in particular to a charging method and device. Background technique [0002] Due to the advantages of high energy density and maintenance-free, lithium batteries are being widely used in various fields. However, due to the limitations of some characteristics of lithium batteries, users have strict requirements on charging methods when using lithium batteries. Only by developing a reasonable charging method can the advantages of lithium batteries be fully utilized and their service life ensured. Several common lithium battery characteristics are as follows: [0003] a. The state of charge (SOC for short) of a lithium battery has a stable mapping relationship with its open circuit voltage (OCV for short). Generally, it does not change with the capacity decay of the lithium battery. [0004] b. Under the same SOC of the same lithium battery, the discharge power is positively correlated with the a...
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IPC IPC(8): H01M10/44H02J7/00
CPCH01M10/446H02J7/007182H01M10/44Y02E60/10
Inventor 陈勇
Owner HUAWEI TECH CO LTD