Inspection apparatus and inspection method of battery pack for on-site electric apparatus
AssigneeMakita Corporation
InventorsToru YAMADA, Koji TAKAHASHI
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Abstract
One aspect of the present disclosure is an inspection apparatus of a battery pack for an on-site electric apparatus, which comprises a coupler, a discharger, a changer, a discharge performing device, a voltage value detector, and a calculator. The changer detects one of a nominal voltage value of the battery pack coupled to the coupler and a voltage value of a battery in the battery pack, and reduces a discharge time of the battery and/or a discharge current value of the battery as the detected value is larger.
Claims13
An inspection apparatus of a battery pack for an on-site electric apparatus, the inspection apparatus comprising:
- a coupler configured to be coupled to the battery pack, the battery pack comprising a battery having a positive electrode terminal and a negative electrode terminal;
- a discharger comprising a transistor, the transistor being coupled between the positive electrode terminal and the negative electrode terminal of the battery in the battery pack coupled to the coupler, and the discharger being configured to discharge the battery via the transistor;
- a changer configured to detect one of a nominal voltage value of the battery pack coupled to the coupler and a voltage value of the battery in the battery pack, and to reduce a discharge time of the battery and/or a discharge current value of the battery as the detected value is larger;
- a discharge performing device configured to cause the discharger to operate during the discharge time to thereby discharge the battery during the discharge time;
- a voltage value detector configured to detect a first voltage value and a second voltage value, the first voltage value being a voltage value of the battery before the discharge performing device starts discharging of the battery, and the second voltage value being a voltage value of the battery during discharging of the battery;
- and
- a calculator configured to calculate an internal resistance value of the battery based on the discharge current value and on a difference value between the first voltage value and the second voltage value detected by the voltage value detector.
An inspection method of a battery pack for an on-site electric apparatus, the battery pack comprising a battery having a positive electrode terminal and a negative electrode terminal, the inspection method comprising:
- coupling a transistor between the positive electrode terminal and the negative electrode terminal of the battery in the battery pack;
- detecting one of a nominal voltage value of the battery pack and a voltage value of the battery in the battery pack;
- setting a discharge time of the battery and/or a discharge current value of the battery such that the discharge time and/or the discharge current value are/is reduced as the detected value is larger;
- discharging the battery via the transistor during the discharge time;
- detecting a first voltage value, the first voltage value being a voltage value of the battery before discharging of the battery is started;
- detecting a second voltage value, the second voltage value being a voltage value of the battery during discharging of the battery;
- calculating a difference value between the detected first voltage value and the detected second voltage value;
- and
- calculating an internal resistance value of the battery based on the discharge current value and on the calculated difference value.
Dependencies are inferred from the claim text.