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Charging control device, secondary battery, electronic apparatus, and control method

A secondary battery and charging control technology, applied in secondary battery charging/discharging, secondary battery, secondary battery repair/maintenance, etc., can solve the problems of rarely using full discharge and low update frequency

Pending Publication Date: 2022-01-07
LENOVO (SINGAPORE) PTE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, if it is necessary to temporarily fully discharge when detecting the full charge capacity of the secondary battery as described above, the fully discharged state is rarely used in actual use, so even if the full charge capacity changes, the frequency of updating is low.

Method used

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  • Charging control device, secondary battery, electronic apparatus, and control method
  • Charging control device, secondary battery, electronic apparatus, and control method
  • Charging control device, secondary battery, electronic apparatus, and control method

Examples

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no. 1 approach ＞

[0042] First, the outline of the information processing apparatus according to the first embodiment of the present invention will be described.

[0043] figure 1 This is an external view of an electronic device in which the secondary battery of the present embodiment is mounted. The illustrated electronic device 10 is a clamshell-type (notebook-type) PC (personal computer). In addition, the electronic device 10 may be a tablet-type PC, a smartphone, or the like.

[0044] The battery 20 is a secondary battery for supplying electric power to the electronic device 10 , and can be repeatedly used by being charged from the AC adapter 30 . For example, the battery 20 can exemplify a lithium-ion battery. When the electronic device 10 is operated by the electric power supplied from the battery 20 , the time during which the electronic device 10 can be operated depends on the remaining capacity of the battery 20 . The remaining capacity (Remaining capacity) of the battery 20 can be...

no. 2 approach ＞

[0089] Next, a second embodiment of the present invention will be described.

[0090] In the first embodiment, the full charge capacity is calculated and updated using the point of switching from constant current charging to constant voltage charging during charging of the secondary battery, but in this embodiment, the change in the internal resistance of the secondary battery is used. to calculate and update the full charge capacity.

[0091] Figure 7 It is a graph showing changes in internal resistance in the charging characteristics of the present embodiment. In this figure, the horizontal axis is the charging rate (SOC [%]), the line indicated by reference numeral 121 indicates the battery voltage (Vc), and the line indicated by reference numeral 122 indicates the charging current (Ic [A] ), and the line indicated by the reference numeral 123 represents the internal resistance (IR [mΩ]). From the change in the charge rate (SOC [%]) and the change in the internal resist...

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Abstract

The invention provides a charge control device, a secondary battery, an electronic apparatus, and a control method, which aim to appropriately update the full charge capacity of a secondary battery in actual use. The charging control device is provided with: a current measurement unit that measures the charging current of the secondary battery; a detection unit that, during charging of the secondary battery, detects switching from constant current charging to constant voltage charging on the basis of the charging current measured by the current measurement unit; and an update unit that updates the full charge capacity of the secondary battery on the basis of the charge capacity after the timing of switching from the constant current charge to the constant voltage charge detected by the detection unit.

Description

technical field [0001] The present invention relates to a charge control device, a secondary battery, an electronic device, and a control method. Background technique [0002] When the secondary battery is repeatedly used, the state of the secondary battery gradually changes and deteriorates. If the fully charged capacity of the secondary battery decreases due to such deterioration over time, an error occurs in the calculation of the remaining capacity. Therefore, it is necessary to detect the change in the full charge capacity of the secondary battery corresponding to the deterioration over time, and to update the value of the full charge capacity. As a method of detecting the full charge capacity of the secondary battery which changes according to the deterioration over time, for example, there is a method in which, after being temporarily completely discharged, charging is performed until it becomes a fully charged state, and the charge capacity at that time is accumulat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00H01M10/44
CPCH02J7/0047H02J7/0048H02J7/0049H02J7/0069H02J7/00712H01M10/446G01R31/36Y02E60/10H02J7/005G01R31/388G01R31/392H02J7/007182
Inventor 山口弘光小菅正大月秀记福冈功一
Owner LENOVO (SINGAPORE) PTE LTD