CN112803557A - Nickel-hydrogen battery charging circuit and nickel-hydrogen battery charging method - Google Patents
Nickel-hydrogen battery charging circuit and nickel-hydrogen battery charging method Download PDFInfo
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- CN112803557A CN112803557A CN202110330554.8A CN202110330554A CN112803557A CN 112803557 A CN112803557 A CN 112803557A CN 202110330554 A CN202110330554 A CN 202110330554A CN 112803557 A CN112803557 A CN 112803557A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention provides a nickel-hydrogen battery charging circuit and a nickel-hydrogen battery charging method, wherein the nickel-hydrogen battery charging circuit comprises an input module, a control module and a battery module, the input module is externally connected with at least one power supply to allow at least one charging current to enter the nickel-hydrogen battery charging circuit, the control module is connected with the input module, the control module comprises a lithium battery charging management chip, the lithium battery charging management chip manages the charging current input by the input module, the battery module comprises at least one nickel-hydrogen battery, and the nickel-hydrogen battery is conductively connected with the control module to charge the nickel-hydrogen battery by utilizing the lithium battery charging management chip.
Description
Technical Field
The invention relates to the technical field of charging, in particular to a nickel-metal hydride battery charging circuit and a nickel-metal hydride battery charging method.
Background
Nickel-metal hydride batteries and lithium batteries are two of the most widely used batteries in electronic products. The lithium battery performs configuration of a charging current by using a lithium battery management chip. The charging process of the lithium battery is divided into three stages: the charging method comprises a pre-charging stage, a large-current constant-current charging stage and a constant-voltage charging stage. The charging process of a nickel-metal hydride battery is also roughly divided into three stages: a charging phase and a trickle charging phase. The two batteries have the same charging stage and different charging stages, so that the two batteries need to be matched with respective charging management chips at present. According to different characteristics of products, manufacturers select a nickel-metal hydride battery or a lithium battery, and select a corresponding charging management chip according to the type of the battery. At present, no charging management chip specially aiming at one or two nickel-hydrogen batteries appears in the market. The mainstream design is trickle charge or control by adding a complex circuit.
Fig. 1 shows a charging process of a typical lithium battery charging management chip for charging a lithium battery. The process of charging the lithium battery by the lithium battery charging management chip is divided into a pre-charging stage, a constant-current charging stage and a constant-voltage charging stage. At the constant current stage, the voltage of lithium cell is less than 2.9V this moment, carries out the precharge for the lithium cell with less electric current, and lithium cell voltage rises gradually, exceeds 2.9V, then gets into the constant current charging stage, and the charging current grow this moment, and lithium cell voltage continues to rise, when the lithium cell is close to being full of, gets into the constant voltage charging stage, and charging current diminishes gradually, and lithium cell charging accomplishes.
Disclosure of Invention
One advantage of the present invention is to provide a nickel-hydrogen battery charging circuit and a method for charging a nickel-hydrogen battery, which select a lithium battery charging management chip to charge the nickel-hydrogen battery, thereby reducing the cost. A
Another advantage of the present invention is to provide a charging circuit and a charging method for a nickel-metal hydride battery, which can charge the nickel-metal hydride battery by using the constant current characteristic of the pre-charging stage of the lithium battery charging management chip, thereby ensuring the consistency of the charging current.
Another advantage of the present invention is to provide a circuit and a method for charging a nickel-hydrogen battery, in which an overvoltage protection circuit is disposed inside the lithium battery charging management chip, and no additional overvoltage protection chip is required, so that the circuit is more simplified.
Another advantage of the present invention is to provide a circuit and a method for charging a nickel-metal hydride battery, which utilize the high integration of the lithium battery charging management chip to reduce the wiring space.
Another advantage of the present invention is to provide a charging circuit and a charging method for a nickel-metal hydride battery, wherein the charging management chip for a lithium battery includes at least one charging control port as a charging detection port, so as to reduce the number of charging detection circuits and save space.
Another advantage of the present invention is to provide a charging circuit and a charging method for a nickel-metal hydride battery, wherein the charging management chip controls the charging control port to output a low level and a low level, respectively, according to at least one charging control signal.
Another advantage of the present invention is to provide a charging circuit and a charging method for a nickel-metal hydride battery, wherein a charging current configuration circuit connected to the charging management chip of the lithium battery is provided, and the charging current is configured by adjusting the resistance value according to the charging control signal.
Another advantage of the present invention is to provide a nickel-metal hydride battery charging circuit and a method for charging a nickel-metal hydride battery, wherein the nickel-metal hydride battery charging circuit includes an input module, and the input module is connected to an external charging power source to supply a forward current to the lithium battery charging management chip.
Another advantage of the present invention is to provide a nickel-metal hydride battery charging circuit and a method for charging a nickel-metal hydride battery, wherein the input module includes a schottky diode to prevent reverse connection and prevent a reverse power source from damaging a circuit of a product.
Another advantage of the present invention is to provide a nickel-hydrogen battery charging circuit and a method for charging a nickel-hydrogen battery, in which the nickel-hydrogen battery charging circuit includes a current-limiting voltage-dividing resistor between the lithium battery charging management chip and the nickel-hydrogen battery, so as to improve the voltage drop of the input and output of the lithium battery charging management chip and reduce the heat generation of the lithium battery charging management chip.
Additional advantages and features of the invention will be set forth in the detailed description which follows and in part will be apparent from the description, or may be learned by practice of the invention as set forth hereinafter.
According to one aspect of the present invention, a charging circuit for a nickel-metal hydride battery comprises:
the input module is externally connected with at least one power supply so that at least one charging current can enter the nickel-hydrogen battery charging circuit;
the control module is connected to the input module and comprises a lithium battery charging management chip which manages the charging current input by the input module; and
and the battery module comprises at least one nickel-metal hydride battery which is conductively connected with the control module and is used for charging the nickel-metal hydride battery by utilizing the lithium battery charging management chip.
According to an embodiment of the present invention, the control module includes a first resistor and a second resistor, the charging current inputted by the input module flows through the first resistor and the second resistor, wherein the first resistor and the second resistor configure resistors for the charging current.
According to an embodiment of the present invention, the lithium battery charging management chip is connected to the first resistor and the second resistor, and the lithium battery charging management chip controls the connection or short circuit of the first resistor and the second resistor through at least one charging control signal to configure the magnitude of the charging current.
According to an embodiment of the present invention, the lithium battery charging management chip includes a charging control port, the charging control port is connected to a main control chip for identifying a charging input, the main control chip controls the charging control port to short-circuit the second resistor when outputting a low level to generate a larger charging current, and the main control chip controls the charging control port to be in an input high-resistance state to communicate with the second resistor to generate a smaller charging current.
According to an embodiment of the present invention, when the input module is externally connected to the power supply, the charging control port is in a high impedance state, the charging current is IBAT = VPROG/(R1+ R2), and the charging current is set to a smaller value.
According to an embodiment of the present invention, the voltage of the nickel-metal hydride battery returns to normal, the charging control port is at an output low level, the charging current is IBAT = VPROG/R1, and the charging current is set to a larger value.
According to one embodiment of the present invention, when the nickel-metal hydride battery is nearly fully charged, the charging control port is in a high impedance state, the charging current is IBAT = VPROG/(R1+ R2), the charging current is set to a small value, and the nickel-metal hydride battery is charged in a trickle charge manner until the charging is completed.
According to an embodiment of the present invention, the input module includes a charging input terminal, the charging input terminal is powered by an external power source, and the input module further includes a schottky diode, and the schottky diode is connected to the charging input terminal to prevent reverse connection.
According to one embodiment of the present invention, the control module includes an input filter capacitor connected to the input module to perform an input filtering function.
According to one embodiment of the invention, the lithium battery charging management chip is internally provided with an overvoltage protection circuit.
According to one embodiment of the invention, the charging control port indicates the charging state and detects the charging state of the nickel-hydrogen battery charging circuit.
According to one embodiment of the invention, the nickel-metal hydride battery is a single or two nickel-metal hydride batteries connected in series.
According to another aspect of the present invention, the present invention further provides a method for charging a nickel-metal hydride battery, comprising:
(A) inputting at least one charging current to a nickel-hydrogen battery charging circuit;
(B) configuring the charging current through a lithium battery charging management chip; and
(C) and charging the charging current into at least one nickel-metal hydride battery.
According to an embodiment of the present invention, the step (B) further comprises the steps of:
and configuring a charging control port of the lithium battery charging management chip through at least one charging control signal.
According to an embodiment of the present invention, the step (B) further comprises the steps of:
and adjusting the resistance value of one or two of a first resistor and a second resistor which are connected with the lithium battery charging management chip so as to adjust the magnitude of the charging current.
According to an embodiment of the present invention, the step (B) further comprises the steps of:
when the nickel-metal hydride battery is charged from 0V, the main control chip is not normally powered on, the charging control port is configured to be in a high-resistance state, the charging current is IBAT = VPROG/(R1+ R2), and the charging current is set to be a smaller value.
According to an embodiment of the present invention, the step (B) further comprises the steps of:
after the voltage of the nickel-metal hydride battery returns to normal, the charging control port is configured to output a low level, and at this time, the charging current is IBAT = VPROG/R1, and the charging current is larger.
According to an embodiment of the present invention, the step (B) further comprises the steps of:
when the nickel-metal hydride battery is nearly fully charged, the charging control port is configured to be in a high impedance state, the charging current is IBAT = VPROG/(R1+ R2), and the charging of the nickel-metal hydride battery is completed in a trickle mode due to the small charging current.
According to an embodiment of the present invention, the step (B) further comprises the steps of:
at least one third resistor is arranged between the lithium battery charging management chip and the nickel-hydrogen battery, the voltage drop of the input and the output of the lithium battery charging management chip is adjusted, and the heat generation of the lithium battery charging management chip is reduced.
Drawings
Fig. 1 is a schematic diagram of a conventional lithium battery charging management chip for charging a lithium battery.
FIG. 2 is a schematic diagram of a charging circuit for a nickel-metal hydride battery according to a preferred embodiment of the invention.
Fig. 3 is a schematic diagram of a main control chip portion of a charging circuit for a nickel-hydrogen battery according to a preferred embodiment of the invention.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The embodiments of the invention described below and illustrated in the drawings are intended to be illustrative only and not limiting of the invention. Any variations or modifications may be made to the embodiments of the invention without departing from the principles described.
Referring to the drawings of fig. 2-3 in the specification of the present invention, a nickel-metal hydride battery charging circuit according to a preferred embodiment of the present invention is disclosed and described in the following description.
The charging circuit for the nickel-hydrogen battery comprises an input module 10, a control module 20 and a battery module 30. The control module 20 is connected to the input module 10 and the battery module 30. At least one charging current is input into the nickel-metal hydride battery charging circuit from the input module 10, flows through the control module 20, and is charged into the battery module 30. The control module 20 configures the charging current.
The input module 10 is externally connected with a charging power supply. The input module 10 includes a charging input terminal J1, the charging input terminal J1 is conductively connected to an external charging power source, and the external charging power source delivers the charging current to the nickel-hydrogen battery charging circuit through the charging input terminal J1. For example, the charging input terminal J1 may be implemented as a USB port.
In one example of the present invention, the battery module 10 may include a schottky diode D1, the schottky diode D1 is connected to the charging input terminal J1, the charging current flows from the charging input terminal J1 to the schottky diode D1, and the schottky diode D1 serves to prevent reverse power from breaking the circuit.
In one example of the present invention, the control module 20 includes an input filter capacitor C1, the input filter capacitor C1 being connected to the schottky diode D1.
The control module 20 further includes a first resistor R1 and a second resistor R2. The second resistor R2 is connected to the input filter capacitor C1, and the first resistor R1 is connected to the second resistor R2. The first resistor R1 and the second resistor R2 are charging current configuration resistors. The charging current is configured by adjusting the resistance value of one or two of the first resistor R1 and the second resistor R2, and the magnitude of the charging current is adjusted.
The control module 20 further includes a lithium battery charging management chip U1, and the lithium battery charging management chip U1 is connected to the first resistor R1. Preferably, a lithium battery charging management chip with an OVP (over voltage protection) function can be selected, so that the circuit safety is enhanced. The lithium battery charging management chip U1 adjusts the resistance value of one or both of the first resistor R1 and the second resistor R2 to adjust the magnitude of the charging current. Lithium battery management chip U1 can be for the lithium battery charging management chip of a large amount of shipment on the market, removes chip design cost from, reduces manufacturing cost, raises the efficiency.
The lithium battery charging management chip U1 controls the second resistor R2 through a charging control signal CCTL. The lithium battery charging management chip U1 adjusts the resistance of the second resistor R2 to configure the magnitude of the charging current.
The lithium battery charging management chip U1 includes at least one charging control port CHRG. The charging control port CHRG indicates whether charging is being performed or not through a charging signal CT.
With reference to fig. 1 and 2, the charging control port CHRG is connected to the main control chip MCU and is used for recognizing a charging input. The lithium battery charging management chip U1 sends the charging signal CT to the main control chip MCU, and the main control chip MCU sends the charging control signal CCTL to the lithium battery charging management chip U1. The main control chip MCU controls the charging control port CHRG to be in a short circuit state when outputting a low level, the second resistor R2 is short-circuited, the charging current is large, and the charging control port CHRG is controlled to be communicated with the second resistor R2 when being in an input high-resistance state, so that the charging current is small.
The control module 20 further includes a third resistor R3, and the third resistor R3 is connected to the charge management chip U1. The third resistor R3 is a current-limiting voltage-dividing resistor, so that the voltage drop of the input and the output of the lithium battery charging management chip U1 is improved, and the input and the output of the lithium battery charging management chip U1 are reduced. By arranging the third resistor R3, heat is evenly generated, and the heat concentrated on the lithium battery charging management chip U1 is reduced.
The battery module 30 includes at least one nickel metal hydride battery BT 1. The nickel-metal hydride battery BT1 is generally a single or two nickel-metal hydride batteries connected in series. The voltage of a single nickel-metal hydride battery after being fully charged is about 1.4V, and the charging voltage of two nickel-metal hydride batteries connected in series is about 2.8V. The lithium battery charging management chip U1 is designed with a pre-charging stage, the threshold of the voltage in the pre-charging stage is set at about 2.9V, and when the voltage of the battery does not exceed 2.9V, the lithium battery charging management chip U1 charges the battery with a constant charging current. This is the pre-charging stage of the lithium battery charging management chip. And charging the single or two serial nickel-metal hydride batteries BT1 by utilizing the constant current characteristic of the lithium battery charging management chip U1 in the pre-charging stage, so as to ensure the consistency of the charging current. Specifically, the working mechanism of the nickel-metal hydride battery charging circuit is as follows:
take the example that two serial nickel-hydrogen batteries BT1 start to charge from 0V. When the input voltage is greater than the undervoltage protection threshold value and the enable terminal is at a high level, the lithium battery charging management chip U1 starts to charge the nickel-metal hydride battery BT1, the charging control port CHRG outputs a low level, and the charging signal CT indicates that the charging is in progress. The charging control port CHRG of the lithium battery charging management chip U1 is used as a charging detection port, so that a charging detection circuit is omitted, the space is saved, and the design and manufacturing cost is reduced.
After the external power supply of charging input end J1, lithium battery charging management chip U1 control lithium battery charging management chip U1 loses the power, unable normal work, main control chip MCU does not normally go up the electricity, the configuration charging control mouth CHRG is in the input high resistance state, charging current is IBAT = VPROG/(R1+ R2), through reasonable setting, utilizes charging control signal CCTL intercommunication second resistance R2, perhaps adjusts when the resistance of second resistance R2 is a great value, can with charging current sets up at a less numerical value. The charging current is kept consistent by keeping the second resistor R2 connected or keeping the resistance of the second resistor R2 unchanged. Since the charging voltage of the nickel-metal hydride battery BT1 does not exceed the voltage threshold of the pre-charging stage of the lithium battery charging management chip U1, the lithium battery charging management chip U1 can keep in the pre-charging stage when charging the nickel-metal hydride battery BT1, and fully utilize the constant current characteristic of the pre-charging stage of the lithium battery charging management chip to perform charging.
When the voltage of the nickel-metal hydride battery BT1 returns to normal, the lithium battery charging management chip U1 supplies power normally, the charging control port CHRG is configured to output low level, the second resistor R2 is short-circuited, the charging current is IBAT = VPROG/R1, and the charging current is large and constant.
When the nickel-metal hydride battery BT1 is nearly fully charged, the charge control port CHRG is in the input high-resistance state, the charge current is IBAT = VPROG/(R1+ R2), the second resistor R2 is connected, the charge current is reduced, and the nickel-metal hydride battery BT1 enters the trickle charge mode to complete charging.
The charging current is controlled through the charging control signal CCTL to realize quick charging and slow charging, and if the short circuit or the connection of the second resistor R2 is adjusted, the magnitude of the charging current is adjusted to carry out quick charging or slow charging. When the voltage of the nickel-metal hydride battery BT1 is 0V, the charging control signal CCTL controls the charging current to be set at a relatively small value, and the nickel-metal hydride battery BT1 starts to be charged, so that the nickel-metal hydride battery BT1 can be charged when the voltage is 0V.
Lithium battery charging management chip U1 can remove chip design cost for the lithium battery charging management chip of a large amount of shipment on the market, can directly choose the chip. The lithium battery charging management chip has high integration level and is beneficial to reducing wiring space. The lithium battery charging management chip is provided with a pre-charging stage, the charging current in the pre-charging stage is kept unchanged, and the lithium battery charging management chip has a constant current characteristic.
The selected lithium battery charging management chip can be internally provided with an overvoltage protection circuit, the overvoltage protection chip is not required to be arranged in the circuit, the cost is reduced, and compared with the traditional control chip which adopts an input voltage circuit, the lithium battery charging management chip is more simplified.
According to another aspect of the present invention, the present invention further provides a method for charging a nickel-metal hydride battery, comprising:
(A) inputting at least one charging current to a nickel-hydrogen battery charging circuit;
(B) configuring the charging current through a lithium battery charging management chip; and
(C) and charging the charging current into at least one nickel-metal hydride battery.
The step (B) further comprises the steps of:
and configuring a charging control port of the lithium battery charging management chip through at least one charging control signal.
The step (B) further comprises the steps of:
and adjusting the resistance value of one or two of a first resistor and a second resistor which are connected with the lithium battery charging management chip so as to adjust the magnitude of the charging current.
The step (B) further comprises the steps of:
when the nickel-metal hydride battery is charged from 0V, the main control chip is not normally powered on, the charging control port is configured to be in an input high-resistance state, the charging current is IBAT = VPROG/(R1+ R2), the second resistor is connected, and the charging current is set to be a smaller value.
The step (B) further comprises the steps of:
after the voltage of the nickel-metal hydride battery returns to normal, the charging control port is configured to output a low level, and at this time, the charging current is IBAT = VPROG/R1, and the charging current is larger.
The step (B) further comprises the steps of:
when the nickel-metal hydride battery is nearly fully charged, the charging control port is configured to be in a high impedance state, the charging current is IBAT = VPROG/(R1+ R2), and the charging of the nickel-metal hydride battery is completed in a trickle mode due to the small charging current.
The step (B) further comprises the steps of:
at least one third resistor is arranged between the lithium battery charging management chip and the nickel-metal hydride battery, and the voltage drop of the input and the output of the lithium battery charging management chip is adjusted to reduce the heat generation.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same, the technical features in the respective technical solutions may be modified or replaced, or combined with each other, and any technical solutions without departing from the principle of the present invention should be included in the protection scope of the present invention.
Claims (19)
1. A nickel-metal hydride battery charging circuit, comprising:
the input module is externally connected with at least one power supply so that at least one charging current can enter the nickel-hydrogen battery charging circuit;
the control module is connected to the input module and comprises a lithium battery charging management chip which manages the charging current input by the input module; and
and the battery module comprises at least one nickel-metal hydride battery which is conductively connected with the control module so as to charge the nickel-metal hydride battery by utilizing the lithium battery charging management chip.
2. The nickel-hydrogen battery charging circuit according to claim 1, wherein the control module comprises a first resistor and a second resistor, the charging current inputted by the input module flows through the first resistor and the second resistor, wherein the first resistor and the second resistor configure a resistor for the charging current.
3. The charging circuit of claim 2, wherein the lithium battery charging management chip is connected to the first resistor and the second resistor, and the lithium battery charging management chip controls the connection or short circuit of the second resistor through at least one charging control signal to configure the magnitude of the charging current.
4. The charging circuit of claim 3, wherein the lithium battery charging management chip comprises a charging control port, the charging control port is connected to a main control chip for identifying a charging input, the main control chip controls the charging control port to short-circuit the second resistor when outputting a low level to generate a larger charging current, and the main control chip controls the charging control port to be in an input high-resistance state to connect the second resistor to generate a smaller charging current.
5. The Ni-MH battery charging circuit of claim 4, wherein when the input module is externally connected to the power supply, the charging control port is in a high impedance state, the charging current is IBAT = VPROG/(R1+ R2), and the charging current is set to a smaller value.
6. The nickel-metal hydride battery charging circuit of claim 5, wherein the voltage of the nickel-metal hydride battery returns to normal, the charging control port is at an output low level, the charging current is IBAT = VPROG/R1, and the charging current is set to a larger value.
7. The nickel-metal hydride battery charging circuit as claimed in claim 6, wherein when the nickel-metal hydride battery is nearly fully charged, the charging control port is in an input high impedance state, the charging current is IBAT = VPROG/(R1+ R2), the charging current is set to a small value, and the nickel-metal hydride battery is charged in a trickle charge until the charging is completed.
8. The charging circuit for a nickel-hydrogen battery according to any one of claims 1 to 7, wherein said input module includes a charging input terminal, said charging input terminal is powered by external power, said input module further includes a schottky diode, said schottky diode is connected to said charging input terminal to prevent reverse connection.
9. The nickel-hydrogen battery charging circuit according to any of claims 1 to 7, wherein the control module comprises an input filter capacitor, and the input filter capacitor is connected to the input module to perform an input filtering function.
10. The nickel-hydrogen battery charging circuit of claim 1, wherein the lithium battery charging management chip is built-in with an overvoltage protection circuit.
11. The nickel-metal hydride battery charging circuit of claim 4, wherein the charging control port indicates a charging state and detects the charging state of the nickel-metal hydride battery charging circuit.
12. The charging circuit for a nickel-metal hydride battery as claimed in any one of claims 1 to 7, wherein said nickel-metal hydride battery is a single or two nickel-metal hydride batteries connected in series.
13. A method of charging a nickel-metal hydride battery, comprising:
(A) inputting at least one charging current to a nickel-hydrogen battery charging circuit;
(B) configuring the charging current through a lithium battery charging management chip; and
(C) and charging the charging current into at least one nickel-metal hydride battery.
14. The nickel-hydrogen battery charging method according to claim 13, wherein the step (B) further comprises the steps of:
and configuring a charging control port of the lithium battery charging management chip through at least one charging control signal.
15. The method for charging a nickel-hydrogen battery according to claim 14, wherein said step (B) further comprises the steps of:
and adjusting the resistance value of one or two of a first resistor and a second resistor which are connected with the lithium battery charging management chip so as to adjust the magnitude of the charging current.
16. The nickel-metal hydride battery charging method of claim 15, wherein said step (B) further comprises the steps of:
when the nickel-metal hydride battery is charged from 0V, the main control chip is not normally powered on, the charging control port is configured to be in an input high-resistance state, at the moment, the charging current is IBAT = VPROG/(R1+ R2), and the charging current is set to be a smaller value.
17. The method for charging a nickel-hydrogen battery according to claim 16, wherein said step (B) further comprises the steps of:
after the voltage of the nickel-metal hydride battery returns to normal, the charging control port is configured to output a low level, and at this time, the charging current is IBAT = VPROG/R1, and the charging current is larger.
18. The method for charging a nickel-metal hydride battery as claimed in claim 17, wherein the step (B) further comprises the steps of:
when the nickel-metal hydride battery is nearly fully charged, the charging control port is configured to be in a high impedance state, the charging current is IBAT = VPROG/(R1+ R2), and the charging of the nickel-metal hydride battery is completed in a trickle mode due to the small charging current.
19. The charging method for a nickel-hydrogen battery according to any one of claims 13 to 18, wherein the step (B) further comprises the steps of:
at least one third resistor is arranged between the lithium battery charging management chip and the nickel-hydrogen battery, the voltage drop of the input and the output of the lithium battery charging management chip is adjusted, and the heat generation of the lithium battery charging management chip is reduced.
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Application publication date: 20210514 |