Battery pack for electric power tool
A technology for electric tools and battery packs, applied in electric vehicles, secondary batteries, charge equalization circuits, etc., can solve problems such as increased deviation, inability to fully reduce deviation, inability to perform balance control, etc., to reduce voltage deviation , well-balanced controls, and simple composition effects
Active Publication Date: 2014-12-03
MAKITA CORP
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Problems solved by technology
[0010] Therefore, according to the above-mentioned proposed device, it is also considered that the variation between the battery cells cannot be sufficiently reduced, and the variation between the battery cells may increase depending on the situation.
[0011] In addition, in the device proposed above, when it is determined whether or not balance control is necessary based on whether one of the voltages of each battery cell is below the end-of-discharge voltage at the time of power supply to the electric tool, if the voltage of each battery cell becomes discharge If the battery pack is charged before the cut-off voltage, there is also the problem that the balance control cannot be performed.
Method used
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Embodiment Construction
[0047] below, with Figure 1 Embodiments of the present invention will be described first.
[0048] Such as figure 1 As shown, the electric tool battery pack (hereinafter simply referred to as the battery pack) 2 of the present embodiment includes a plurality of (five in the figure) battery cells 11 , 12 , 13 , 14 , and 15 that can be charged and discharged in series. battery10.
[0049] In addition, the housing of the battery pack 2 is configured such that either a charger 60 or an electric tool (not shown) can be selectively attached.
[0050] Furthermore, the positive side and the negative side of the battery 10 are connected to the terminals 4 and 6, and the terminals 4 and 6 are respectively connected to the positive side and the The respective terminals 64 and 66 on the negative side are connected.
[0051] Therefore, when the battery pack 2 is attached to the charger 60 , the battery 10 can be charged from the charger 60 via the terminals 4 , 6 and the terminals 64 ...
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A battery pack for an electric power tool includes a control device (40) that determines the necessity of a balancing control to reduce difference in voltages of cells (11-15) of a battery (10) based upon voltages of the respective cells (11-15) measured by a voltage measuring device (28). The control device (40) controls a subject cell (11-15), which is subject to the balancing control to discharge via the discharging device (21-25) when the balancing control is determined to be necessary. A voltage measuring device (28) measures the voltages of the respective cells (11-15) when a battery charger detecting device (56) detects the connection of the battery charger (60) in a state where the battery (10) has not been connected to the battery charger (60) for a predetermined specified period of time or more and power feeding to the electric power tool has not been performed for the specified period of time or more.
Description
technical field [0001] The present invention relates to a battery pack for an electric tool including a battery configured by connecting a plurality of chargeable and dischargeable battery cells in series. Background technique [0002] In such a battery pack for an electric tool, when the battery is repeatedly used up to the overdischarge region, there is a problem that a capacitance imbalance occurs among the battery cells constituting the battery, and the life of the battery is shortened. [0003] Therefore, conventionally, in order to prevent such a problem, it has been proposed to measure the voltage of each battery cell at a set timing when at least one of the voltages of a plurality of battery cells becomes equal to or lower than the end-of-discharge voltage, so that the voltages of all the battery cells become one of the measured voltages. Each battery cell is discharged using a minimum voltage method (for example, refer to Patent Document 1). [0004] That is, accor...
Claims
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IPC IPC(8): H02J7/00H02J7/02
CPCH01M10/482H01M2010/4271H02J7/0016Y02E60/10
Inventor 花井宽冈林寿和山田彻野田将史远藤隆良
Owner MAKITA CORP