Battery charging method, apparatus and equipment

Abstract

The invention discloses a battery charging method, apparatus and equipment. The charging method comprises the steps of setting a charging current value I<n> and determining a charging cut-off voltage value V<n> corresponding to I<n>; when the battery internal resistance growth rate reaches an internal resistance growth rate threshold value and is less than the maximum value of the internal resistance growth rate threshold value in battery circulation, correcting I<n-1> and corresponding V<n-1> according to monitored battery capacity retention ratio and battery internal resistance; in the (n-1) charging stage, charging the battery by I<n-1>, when the charging voltage of the battery reaches V<n-1> and when (n-1) is smaller than the set total number of charging stages, entering the n charging stage, and when the charging voltage of the battery reaches V<n-1> and when (n-1) is equal to the set total number of charging stages, stopping charging; and when the battery internal resistance growth rate is greater than or equal to the maximum value of the internal resistance growth rate threshold value, stopping the charge-discharge circulation of the battery. By virtue of the battery charging method provided by the embodiments, battery overcharging can be prevented, and the service life of the battery can be prolonged.

Description

technical field

[0001] The invention belongs to the field of battery technology, and in particular relates to a battery charging method, device and equipment. Background technique

[0002] In recent years, clean and environmentally friendly new energy vehicles have attracted the attention and welcome of the market. Among them, power batteries have become the heart of new energy vehicles. With the upgrading of user experience and market competition, how to charge batteries efficiently, safely and with a long life has become a consumer issue. one of the key concerns of the researchers.

[0003] During the cycle of power lithium-ion batteries, the DC internal resistance will gradually increase. However, in the existing battery charging technology of charging piles, the same charging process is adopted for batteries that have undergone different charging cycles, that is, Stop charging when the rechargeable battery reaches the artificially set cut-off voltage, which will cause o...

Examples

specific Embodiment

[0118] Before the start of the selected battery charge and discharge cycle, set the DCR growth thresholds during the battery charge and discharge cycle to 10%, 20%, 30%, 40% and 50%, respectively, and monitor the initial value of the battery internal resistance DCR 0 =1.00mohm, and the maximum charge cut-off voltage of the battery is 4.250V.

[0119] Set the initial charging current value {80.0A, 60.0A, 40.0A, 20.0A, 10.0A} during the charging process of a group of batteries, and calculate the charging current value corresponding to each stage through the above formula (1). Charge cut-off voltage {4.170V, 4.190V, 4.210V, 4.230V, 4.240V}.

[0120] Figure 5 A schematic diagram of a charging curve at an initial charging current value in a battery charging method according to another embodiment of the present invention is shown.

[0121] like Figure 5 As shown, in the initial stage of the battery charge and discharge cycle, the battery is charged with the set initial charge c...

technical field

[0001] The invention belongs to the field of battery technology, and in particular relates to a battery charging method, device and equipment. Background technique

[0002] In recent years, clean and environmentally friendly new energy vehicles have attracted the attention and welcome of the market. Among them, power batteries have become the heart of new energy vehicles. With the upgrading of user experience and market competition, how to charge batteries efficiently, safely and with a long life has become a consumer issue. one of the key concerns of the researchers.

[0003] During the cycle of power lithium-ion batteries, the DC internal resistance will gradually increase. However, in the existing battery charging technology of charging piles, the same charging process is adopted for batteries that have undergone different charging cycles, that is, Stop charging when the rechargeable battery reaches the artificially set cut-off voltage, which will cause o...

Examples

specific Embodiment

[0118] Before the start of the selected battery charge and discharge cycle, set the DCR growth thresholds during the battery charge and discharge cycle to 10%, 20%, 30%, 40% and 50%, respectively, and monitor the initial value of the battery internal resistance DCR 0 =1.00mohm, and the maximum charge cut-off voltage of the battery is 4.250V.

[0119] Set the initial charging current value {80.0A, 60.0A, 40.0A, 20.0A, 10.0A} during the charging process of a group of batteries, and calculate the charging current value corresponding to each stage through the above formula (1). Charge cut-off voltage {4.170V, 4.190V, 4.210V, 4.230V, 4.240V}.

[0120] Figure 5 A schematic diagram of a charging curve at an initial charging current value in a battery charging method according to another embodiment of the present invention is shown.

[0121] like Figure 5 As shown, in the initial stage of the battery charge and discharge cycle, the battery is charged with the set initial charge c...

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