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A battery and resistor technology, applied in the field of battery diagnostic devices and methods, capable of solving unreliable and other problems
Active Publication Date: 2011-09-14
KK TOSHIBA
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Therefore, the current value determined solely by the degree
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no. 2 example
[0090] The second embodiment differs from the first in that the current value of the battery is calculated using the measured current capacity and the measured R SOL with R CT to be sure. Therefore, the same components as those of the first embodiment are denoted by the same reference numerals used in the first embodiment, and their detailed explanations are omitted here.
[0091] In the second embodiment, in periodic diagnosis of an electric vehicle or the like, R is measured when the battery pack 200 is connected to the diagnosis device 100 SOL with R CT , as described in the first embodiment.
[0092] Next, the battery capacity at different C rates was measured.
[0093] The charging-discharging unit 120 of the diagnostic device 100 has a function of performing step-down discharge and step-down charging, and is capable of measuring battery capacities at various C rates: 1C, 2C, 4C, and 8C.
[0094] Figure 8 is a flow chart showing the outline of the operation to dete...
no. 3 example
[0119] In the second embodiment, charging and discharging operations are controlled by the charging-discharging unit 120 to measure the battery capacities of the respective currents of 1C, 2C, 4C, and 8C. The third embodiment differs from the second embodiment in that the index is measured only by the charging operation. Therefore, the same components as in the first embodiment are denoted by the same reference numerals as in the first embodiment, and their detailed explanations are omitted here.
[0120] Figure 14 The relationship between the time TH4 obtained by charging and the time TH1 is shown. refer to Figure 14 , describing the operation of the controller 122.
[0121] The diagnostic device 100 is connected to the battery pack 200, the controller 122 is switched to a mode for controlling charging, and the start switch 121 is turned on. The controller 122 then controls the charging-discharging unit 120 to perform 8C charging. When sensing that the total voltage of...
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Abstract
An apparatus is disclosed that includes a resistance measuring unit operable to determine a solution resistance Rsol and a charge transfer resistance Rest of a battery; and at least one computer-readable non-transitory storage medium comprising code, that, when executed by at least one processor, is operable to provide an estimate of the present value of the battery by: comparing Rsol and Rct to historical deterioration transition information; estimating the number of remaining charge cycles before a discharge capacity lower limit is reached by the battery using the comparison; and estimating the number of remaining charge cycles before a discharge time lower limit is reached by the battery using the comparison. The estimate of the present value of the battery includes the smaller of the number of remaining charge cycles before a discharge capacity lower limit is reached or the number of remaining charge cycles before a discharge time lower limit is reached.
Description
[0001] Cross References to Related Applications [0002] This application is based on and claims the benefit of priority from Japanese Patent Application No. 2009-295627 filed on December 25, 2009, the entire contents of which are hereby incorporated by reference. technical field [0003] The present disclosure relates to techniques and devices for determining battery degradation status and current value. Background technique [0004] Batteries mounted on electric vehicles (EV) are expensive, and the ratio of the price of such batteries to the price of electric vehicles is higher than the ratio of the price of batteries to that of electronic devices such as notebook computers or portable phones. For example, some point to expensive batteries as the biggest factor in the high cost of electric vehicles. Therefore, knowing the current price of each battery is a must when electric vehicles are brought to the used car market. [0005] However, the degree of deterioration of bat...
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