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US 12,015,296 B2Granted
Charging method and apparatus
AssigneeHuawei Technologies Co., Ltd.
InventorsPeng Lu, Xiaohu He, Jun Wu
Life of this patent
Estimating the term…
Abstract
A charging method, where in a process of performing constant voltage charging on a battery at a charging voltage that is greater than an end-of-precharge voltage and less than a maximum charging voltage, a charging apparatus determines a current relaxation time and controls a charging current and a charging voltage based on the current relaxation time, to adaptively charge the battery.
Claims20
A method comprising:
- performing first constant voltage charging on a battery at a present charging voltage, wherein the present charging voltage is greater than an end-of-precharge voltage of the battery and less than a maximum charging voltage of the battery, wherein the maximum charging voltage represents a withstand voltage of a positive electrode material, an electrolyte, or a positive electrode current collector of the battery, and wherein the end-of-precharge voltage is a critical voltage at which the battery changes from an overdischarge state to a normal discharge state;
- determining a current relaxation time while performing the first constant voltage charging on the battery, wherein the current relaxation time reflects a change of an electrochemical reaction rate in the battery;
- obtaining a present state of charge (SOC) of the battery;
- calculating a would-be charging current based on the current relaxation time and the present SOC;
- and
- performing at least one of:
- performing constant current charging on the battery at the would-be charging current, determining a first voltage of a first preset threshold as a would-be charging voltage and performing a second constant voltage charging on the battery at the would-be charging voltage when a second voltage of the battery reaches the first preset threshold while performing the constant current charging, and performing a third constant voltage charging on the battery at the maximum charging voltage until a quantity of electricity in the battery reaches a full-charge quantity of electricity when the second voltage reaches the maximum charging voltage while performing the constant current charging, wherein the first voltage is less than the maximum charging voltage, and wherein the battery reaches the full-charge quantity of electricity when the battery is fully charged;
- or
- determining a third voltage corresponding to the would-be charging current as the would-be charging voltage, performing the second constant voltage charging on the battery, repeating each of performing the first constant voltage charging on the battery, determining the current relaxation time, obtaining the present SOC, and calculating the would-be charging current, during a constant voltage charging process until the would-be charging voltage reaches the maximum charging voltage, and performing the third constant voltage charging on the battery until the quantity of electricity reaches the full-charge quantity of electricity.
6 more elements
A charging apparatus, comprising:
- a memory configured to store instructions;
- and
- a processor coupled to the memory and configured to:
- to perform first constant voltage charging on a battery at a present charging voltage, wherein the present charging voltage is greater than an end-of-precharge voltage of the battery and less than a maximum charging voltage of the battery, wherein the maximum charging voltage represents a withstand voltage of a positive electrode material, an electrolyte, or a positive electrode current collector of the battery, and wherein the end-of-precharge voltage is a critical voltage at which the battery changes from an overdischarge state to a normal discharge state;
- determine a current relaxation time while to performing the first constant voltage charging on the battery, wherein the current relaxation time reflects a change of an electrochemical reaction rate in the battery;
- obtain the present state of charge (SOC) of the battery;
- calculate a would-be charging current based on the current relaxation time and the present SOC;
- and
- perform at least one of:
- perform constant current charging on the battery at the would-be charging current, determine a first voltage of a first preset threshold as a would-be charging voltage and perform a second constant voltage charging on the battery at the would-be charging voltage when a second voltage of the battery reaches the first preset threshold while performing the constant current charging, and perform a third constant voltage charging on the battery at the maximum charging voltage until a quantity of electricity in the battery reaches a full-charge quantity of electricity when the second voltage reaches the maximum charging voltage while performing the constant current charging, wherein the first voltage is less than the maximum charging voltage, and wherein the battery reaches the full-charge quantity of electricity when the battery is fully charged;
- or
- determine a third voltage corresponding to the would-be charging current as the would-be charging voltage, to perform the second constant voltage charging on the battery, repeat each of performing the first constant voltage charging on the battery, determining the current relaxation time, obtaining the present SOC, and calculating the would-be charging current, during a constant voltage charging process until the would-be charging voltage reaches the maximum charging voltage, and to perform the third constant voltage charging on the battery until the quantity of electricity reaches the full-charge quantity of electricity.
9 more elements
A computer program product comprising computer-executable instructions stored on a non-transitory computer-readable medium that, when executed by a processor, cause a charging apparatus to:
- perform first constant voltage charging on a battery at a present charging voltage, wherein the present charging voltage is greater than an end-of-precharge voltage of the battery and less than a maximum charging voltage of the battery, wherein the maximum charging voltage represents a withstand voltage of a positive electrode material, an electrolyte, or a positive electrode current collector of the battery, and wherein the end-of-precharge voltage is a critical voltage at which the battery changes from an overdischarge state to a normal discharge state;
- determine a current relaxation time while performing the first constant voltage charging on the battery, wherein the current relaxation time reflects a change of an electrochemical reaction rate in the battery;
- obtain a present state of charge (SOC) of the battery;
- calculate a would-be charging current based on the current relaxation time and the present SOC;
- and
- perform at least one of:
- perform constant current charging on the battery at the would-be charging current, determine a first voltage of a first preset threshold as a would-be charging voltage and perform a second constant voltage charging on the battery at the would-be charging voltage when a second voltage of the battery reaches the first preset threshold during the constant current charging, and perform a third constant voltage charging on the battery at the maximum charging voltage until a quantity of electricity in the battery reaches a full-charge quantity of electricity when the second voltage reaches the maximum charging voltage during the constant current charging, wherein the first voltage is less than the maximum charging voltage, and wherein the battery reaches the full-charge quantity of electricity when the battery is fully charged;
- or
- determine a third voltage corresponding to the would-be charging current as the would-be charging voltage, perform the second constant voltage charging on the battery, repeat each of performing the first constant voltage charging on the battery, determining the current relaxation time, obtaining the present SOC, and calculating the would-be charging current, during a constant voltage charging process until the would-be charging voltage reaches the maximum charging voltage, and perform the third constant voltage charging on the battery until the quantity of electricity reaches the full-charge quantity of electricity.
6 more elements
Dependencies are inferred from the claim text.