Method and device for detecting states of battery and battery pack
First Claim
1. A method for detecting a state of a battery, comprising:
- obtaining a first state of charge by use of a charge calculation method, and obtaining a second state of charge in accordance with a battery model and a relationship between an open circuit voltage and said state of charge;
performing a weighted calculation for said first state of charge and said second state of charge to obtain a chemistry state of charge; and
obtaining a residual charge in accordance with a present chemistry state of charge, a minimum chemistry state of charge and a present maximum charge amount.
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Abstract
Disclosed is a method and a device for detecting states of a battery and a battery pack. The disclosure obtains a first state of charge and a second state of charge of the battery by use of a charge calculation method and a method based on battery model, respectively. The charge calculation method is more accurate when the charge-discharge current is large and the method based on battery model performs better in handling a small current, so that a chemistry state of charge obtained by performing a weighted calculation for the first state of charge and the second state of charge can represent the real state of charge of the battery more precisely. The disclosure settles the difficulty on parameter extraction of the conventional model method, eliminates the influence of the accumulated error of the charge calculation method, and combines the advantages of the method based on the battery model and the coulometer method.
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Citations
13 Claims
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1. A method for detecting a state of a battery, comprising:
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obtaining a first state of charge by use of a charge calculation method, and obtaining a second state of charge in accordance with a battery model and a relationship between an open circuit voltage and said state of charge; performing a weighted calculation for said first state of charge and said second state of charge to obtain a chemistry state of charge; and obtaining a residual charge in accordance with a present chemistry state of charge, a minimum chemistry state of charge and a present maximum charge amount. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 13)
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11. A method for detecting a state of a battery pack, wherein said battery pack comprises at least two batteries being coupled in series or in parallel, said method comprises:
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obtaining a first state of charge of each battery by use of a charge calculation method, and obtaining a second state of charge of each battery in accordance with a battery model and a relationship between open circuit voltage and state of charge; and performing a weighted calculation for said first state of charge and said second state of charge of each battery to obtain a chemistry state of charge of each battery; calculating a chemistry state of charge of said battery pack in accordance with said chemistry state of charge of each battery; and obtaining a residual charge in accordance with a present chemistry state of charge, a minimum chemistry state of charge and a present maximum charge amount.
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12. A method for detecting a state of a battery pack, wherein said battery pack comprises at least two batteries being coupled in series or in parallel, said method comprises:
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obtaining a first state of charge of said battery pack by use of a charge calculation method, and obtaining a second state of charge of said battery pack in accordance with a battery model and a relationship between open circuit voltage and state of charge;
wherein an average terminal voltage of said batteries in said battery pack is used for calculating an open circuit voltage of a battery;performing a weighted calculation for said first state of charge of said battery pack and said second state of charge of said battery pack to obtain a chemistry state of charge of said battery pack; and obtaining a residual charge in accordance with a present chemistry state of charge, a minimum chemistry state of charge and a present maximum charge amount.
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Specification