State of charge calculation device
A state-of-charge and calculation technology, which is applied to circuit devices, battery circuit devices, measuring devices, etc., can solve the problems of calculating the initial charging state of the battery without considering the initial charging state of the battery, and the initial charging state of Effect
Active Publication Date: 2017-01-04
SUZUKI MOTOR CORP
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Problems solved by technology
In addition, the device described in Patent Document 1 does not take into account the calculation of the initial state of charge of the storage battery at the time of device startup, so there is a problem that the calculation of the initial state of charge at the time of device startup cannot be accurately performed.
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Embodiment Construction
[0033] Refer to the following Figure 1 to Figure 7 Embodiments of the present invention will be described in detail. First, the configuration will be described. exist figure 1 Among them, the vehicle 1 is constituted as an electric vehicle, and the electric vehicle includes a storage battery 21, an electric load 24, a charging state calculation device 10, a host controller 26, and an ignition key 27. The electric load 24 travels. In addition, the vehicle 1 includes a charging circuit 25 that charges the battery 21 with electricity supplied from an external supply source 28 .
[0034] The storage battery 21 is configured as a battery pack in which a plurality of battery cells 22 are connected in series. Each battery unit 22 includes a lithium-ion battery or a nickel-metal hydride battery. In addition, the storage battery 21 has a voltage sensor 18 , a current sensor 19 , and a temperature sensor 20 . The voltage sensor 18 detects a voltage between terminals of the stora...
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To provide a state of charge calculating device capable of calculating an initial state of charge with high accuracy and in a short time. The first state of charge calculation unit (31) of the initial state of charge calculation unit (11) calculates the first state of charge based on the first open circuit voltage read from the storage unit (17), and the second state of charge calculation unit (32) calculates the first state of charge based on the first open circuit voltage read from the storage unit (17). 2. The second open-circuit voltage deduced by the open-circuit voltage deriving unit calculates the second state of charge, and the third state-of-charge determination unit (33) sets one of the first state of charge and the second state of charge as the third state of charge, and the weighting coefficient is set to The setting unit (34) sets a weighting coefficient for weighted synthesis of the third charging state and the operating charging state in such a manner that the greater the difference between the first charging state and the second charging state is, the greater the weight of the operating charging state is. (35) The first state of charge is calculated by weighting and combining the third state of charge and the state of charge in operation read from the storage unit (17) using a weighting coefficient.
Description
technical field [0001] The present invention relates to a state of charge calculation device for calculating the state of charge of a storage battery, and more particularly, to a state of charge calculation device capable of accurately calculating an initial state of charge at device startup. Background technique [0002] In general, in a vehicle that runs on electric energy stored in a battery such as an electric vehicle, it is required to calculate a state of charge (SOC: State of Charge) of the battery with high precision in order to calculate a travelable distance. [0003] Conventionally, as a state-of-charge calculation device for calculating the state-of-charge of a storage battery, the following is known: using the correlation between the open-circuit voltage and the state-of-charge of the battery to calculate the state-of-charge based on the open-circuit voltage, and to calculate the current accumulation based on the current accumulation by integrating the input and ...
Claims
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IPC IPC(8): H02J7/00G01R31/36
Inventor 宫野龙一
Owner SUZUKI MOTOR CORP