CN112968485A - UPS lithium battery floating charge control circuit, lithium battery system and UPS lithium battery charge control method - Google Patents
UPS lithium battery floating charge control circuit, lithium battery system and UPS lithium battery charge control method Download PDFInfo
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- CN112968485A CN112968485A CN202110152219.3A CN202110152219A CN112968485A CN 112968485 A CN112968485 A CN 112968485A CN 202110152219 A CN202110152219 A CN 202110152219A CN 112968485 A CN112968485 A CN 112968485A
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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
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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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
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
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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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The invention discloses a floating charge control circuit of a UPS lithium battery, a lithium battery system and a charging control method of the UPS lithium battery. UPS lithium cell floats fills control circuit includes: the first input end, the second input end, the first output end, the second output end, the first switch unit, the floating charge resistor and the control unit; the control unit is used for controlling the floating charge control circuit of the UPS lithium battery to be in a constant charge state or a floating charge state according to the current voltage of the lithium battery, the preset floating charge voltage and the voltage entering the floating charge in the charging stage; the first end of the first switch unit is electrically connected with the first input end, the second end of the first switch unit is electrically connected with the first end of the floating charging resistor, and the third end of the first switch unit is electrically connected with the first output end; the resistance value of the floating charge resistor is determined by the preset floating charge voltage, the voltage entering the floating charge, the power consumption of the UPS lithium battery floating charge control circuit and a preset formula. According to the embodiment of the invention, the lithium battery can be in a floating-charge and non-overcharging state for a long time.
Description
Technical Field
The embodiment of the invention relates to a charging technology, in particular to a floating charge control circuit of a UPS lithium battery, a lithium battery system and a charging control method of the UPS lithium battery.
Background
As a clean, efficient and pollution-free energy storage element, lithium ion batteries are increasingly used in the fields of Power, energy storage, Uninterruptible Power Supplies (UPS), and the like; among them, the UPS field has been occupied by lead-acid batteries, but due to the low energy density, environmental pollution, short life of lead-acid batteries, it has become a research hotspot to replace lead-acid batteries with lithium batteries in the UPS field.
However, lead-acid batteries can support float charge due to the inherent electrochemical principle and characteristics, and battery management systems such as BMS (battery management system) and overcharge protection devices are not needed after a battery system is formed; however, if the lithium battery is subjected to long-term floating charge, the lithium battery is overcharged, and further, fire, explosion and other dangers occur, so that how to prevent overcharge of the lithium battery during floating charge becomes important.
Disclosure of Invention
The invention provides a floating charge control circuit of a UPS lithium battery and a lithium battery system, which aim to realize that the lithium battery can be in a floating charge state for a long time and is not overcharged.
In a first aspect, an embodiment of the present invention provides a UPS lithium battery floating charge control circuit, where the UPS lithium battery floating charge control circuit includes:
the first input end, the second input end, the first output end, the second output end, the first switch unit, the floating charge resistor and the control unit;
the first input end and the second input end are used for being connected with a charging power supply, and the first output end and the second output end are used for being electrically connected with a lithium battery;
the control unit is used for controlling the UPS lithium battery floating charge control circuit to be in a constant charge state or a floating charge state according to the current voltage of the lithium battery, the preset floating charge voltage and the voltage entering the floating charge in the charging stage;
the first switch unit is configured to conduct the first end and the second end of the first switch unit according to a first control signal of the control unit so as to enable the UPS lithium battery floating charge control circuit to be in a floating charge state, and conduct the first end and the third end of the first switch unit according to a second control signal of the control unit so as to enable the UPS lithium battery floating charge control circuit to be in a constant charge state; the second end of the floating charge resistor is electrically connected with the first output end;
the resistance value of the floating charge resistor is determined by the preset floating charge voltage, the voltage entering the floating charge, the power consumption of the UPS lithium battery floating charge control circuit and a preset formula.
The floating charge state means that the lithium battery can be kept in a full charge state as much as possible under the action of terminal voltage without being overcharged.
The constant charging state is a state that when the voltage of the battery is lower, the external voltage charges the lithium battery, so that the voltage of the lithium battery is increased.
Optionally, the preset formula is: r is not less than (U)0-U) U)/P; wherein R is the resistance value of the floating charge resistor, U0And the preset floating charge voltage is U, the voltage entering the floating charge is U, and P is the power consumption of the UPS lithium battery floating charge control circuit.
Preferably, R>((U0-U)U)/P；
Optionally, the first switching unit comprises a single pole double throw relay;
a coil of the single-pole double-throw relay is electrically connected with the control unit, a first end of a single-pole double-throw switch in the single-pole double-throw relay serves as a first end of the first switch unit, a second end of the single-pole double-throw switch serves as a second end of the first switch unit, and a third end of the single-pole double-throw switch serves as a third end of the first switch unit; the single-pole double-throw switch can conduct the first end with the second end or conduct the first end with the third end.
Optionally, in a constant charge stage, the control unit is configured to generate the first control signal after a first preset time if it is detected that a current voltage of the lithium battery is greater than the voltage entering a floating charge, and the single-pole double-throw relay is configured to turn on a first end of the single-pole double-throw switch and a second end of the single-pole double-throw switch according to the first control signal and turn off the first end of the single-pole double-throw switch and a third end of the single-pole double-throw switch;
if the current voltage of the lithium battery is detected to be less than or equal to the voltage entering the floating charge, generating a second control signal after a second preset time, wherein the single-pole double-throw relay is configured to conduct the first end of the single-pole double-throw switch and the third end of the single-pole double-throw switch according to the second control signal and to turn off the first end of the single-pole double-throw switch and the second end of the single-pole double-throw switch.
Optionally, the first switching unit comprises a first relay and a second relay;
the first relay comprises a first coil and a first switch, and the second relay comprises a second coil and a second switch;
the first coil and the second coil are electrically connected with the control unit;
and the first end of the first switch and the first end of the second switch are short-circuited and then are used as the first end of the first switch unit, the second end of the first switch is used as the second end of the first switch unit, and the second end of the second switch is used as the third end of the first switch unit.
Optionally, in a constant charging stage, the control unit is configured to generate the first control signal after a third preset time if it is detected that the current voltage of the lithium battery is greater than the voltage for entering the floating charge, and generate a third control signal after a fourth preset time, where the first relay turns on the first switch according to the first control signal, the second relay turns off the second switch according to the third control signal, and the fourth preset time is greater than or equal to the third preset time;
if the current voltage of the lithium battery is detected to be smaller than or equal to the voltage for entering the floating charge, the second control signal is generated after a fifth preset time, a fourth control signal is generated after a sixth preset time, the second relay conducts the second switch according to the second control signal, the first relay turns off the first switch according to the fourth control signal, and the sixth preset time is larger than or equal to the fifth preset time.
Optionally, the control unit is further configured to generate a fifth control signal at an initial stage of charging, and the first switch unit turns on the first terminal and the third terminal thereof according to the fifth control signal and turns off the first terminal and the third terminal thereof.
Optionally, the preset floating charge voltage is less than the charge protection voltage of the lithium battery, and the voltage entering the floating charge is less than the preset floating charge voltage.
Optionally, the method further comprises:
the second switch unit is connected between the first input end and the first output end and used for discharging the lithium battery; and/or the presence of a gas in the gas,
and the third switching unit is connected between the second input end and the second output end and is used for controlling the conduction state of the second input end and the second output end.
In a second aspect, an embodiment of the present invention further provides a lithium battery system, including a lithium battery and the UPS lithium battery floating charge control circuit according to the first aspect;
the positive pole of lithium cell with first output electricity is connected, the negative pole of lithium cell with the second output electricity is connected.
In a third aspect, an embodiment of the present invention further provides a method for controlling charging of a UPS lithium battery, where the method is executed by the lithium battery system of the second aspect, and includes the following steps:
when the lithium battery is in a constant charging state and the current voltage of the lithium battery is greater than the preset voltage for entering the floating charging state, the control unit generates a first control signal after a first preset time, and the lithium battery enters the floating charging state;
when the lithium battery is in a floating charge state and the current voltage of the lithium battery is less than or equal to the preset voltage for entering the floating charge state, the control unit generates a second control signal after a second preset time, and the lithium battery enters a constant charge state;
wherein, float and fill resistance, predetermine float charge voltage, get into the voltage that float and fill and UPS lithium cell float and fill control circuit's consumption and satisfy:
r is not less than (U)0-U) U)/P; r is the resistance value of the floating charge resistor, U0And the preset floating charge voltage is U, the voltage entering the floating charge is U, and P is the power consumption of the UPS lithium battery floating charge control circuit.
Preferably, R>((U0-U)U)/P。
The UPS lithium battery floating charge control circuit comprises a first input end, a second input end, a first output end, a second output end, a first switch unit, a floating charge resistor and a control unit; the first input end and the second input end are used for being connected with a charging power supply, and the first output end and the second output end are used for being electrically connected with the lithium battery; the control unit is used for controlling the floating charge control circuit of the UPS lithium battery to be in a constant charge state or a floating charge state according to the current voltage of the lithium battery, the preset floating charge voltage and the voltage entering the floating charge in the charging stage; the first switch unit is configured to conduct the first end and the second end of the first switch unit according to a first control signal of the control unit so as to enable the floating charge control circuit of the UPS lithium battery to be in a floating charge state, and conduct the first end and the third end of the first switch unit according to a second control signal of the control unit so as to enable the floating charge control circuit of the UPS lithium battery to be in a constant charge state; the second end of the floating charge resistor is electrically connected with the first output end; the resistance value of the floating charge resistor is determined by a preset floating charge voltage, a voltage entering the floating charge, the power consumption of the floating charge control circuit of the UPS lithium battery and a preset formula. The controllable UPS lithium cell of the control unit floats and fills control circuit for floating and filling the state or constantly filling the state to make the UPS lithium cell float and fill control circuit can charge the lithium cell fast and safely, and under the state of filling floating, owing to float the effect of filling resistance, make the power consumption that floats the charging power less than or equal to UPS lithium cell float and fill control circuit, and then guarantee that the lithium cell is in for a long time and float the state of filling, also can not produce the overcharge phenomenon.
Drawings
Fig. 1 is a schematic circuit structure diagram of a UPS lithium battery floating charge control circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a circuit structure of a UPS lithium battery floating charge control circuit connected to a lithium battery according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a circuit structure of a UPS lithium battery floating charge control circuit electrically connected to a lithium battery according to an embodiment of the present invention;
fig. 4 is a circuit structure of a UPS lithium battery floating charge control circuit electrically connected to a lithium battery according to another embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic diagram of a circuit structure of a UPS lithium battery floating charge control circuit according to an embodiment of the present invention, and fig. 2 is a schematic diagram of a circuit structure of a UPS lithium battery floating charge control circuit according to an embodiment of the present invention connected to a lithium battery, where referring to fig. 1 and fig. 2, the UPS lithium battery floating charge control circuit includes: a first input terminal IN1, a second input terminal IN2, a first output terminal OUT1, a second output terminal OUT2, a first switch unit 10, a floating charge resistor 11 and a control unit 12; the first input end IN1 and the second input end IN2 are used for connecting a charging power supply, and the first output end OUT1 and the second output end OUT2 are used for being electrically connected with the lithium battery 20; the control unit 12 is used for controlling the floating charge control circuit to be in a constant charge state or a floating charge state according to the current voltage of the lithium battery, the preset floating charge voltage and the voltage entering the floating charge in the charging stage; the first terminal a1 of the first switch unit 10 is electrically connected to the first input terminal IN1, the second terminal a2 of the first switch unit 10 is electrically connected to the first terminal of the floating resistor 11, the third terminal of the first switch unit 10 is electrically connected to the first output terminal OUT1, the first switch unit 10 is configured to switch on the first terminal a1 and the second terminal a2 thereof according to the first control signal of the control unit 12 to enable the floating control circuit to be IN the floating state, and switch on the first terminal a1 and the third terminal A3 thereof according to the second control signal of the control unit 12 to enable the floating control circuit to be IN the constant charging state; the second end of the floating charge resistor 11 is electrically connected with a first output end OUT 1; the resistance value of the floating charge resistor 11 is determined by a preset floating charge voltage, a voltage entering the floating charge, the power consumption of the floating charge control circuit of the UPS lithium battery and a preset formula.
Specifically, the lithium battery 20 may be, for example, a lithium iron phosphate battery or other lithium ion batteries, and the lithium battery 20 may include at least one battery cell, and the number of the battery cells in the lithium battery 20 is not specifically limited in the embodiment of the present invention; the first input terminal IN1 and the second input terminal IN2 are used for accessing a charging power supply, and the types of signals input by the charging power supply to the first input terminal IN1 and the second input terminal IN2 may be different when the UPS lithium battery floating charge control circuit is IN different states, for example, if the UPS lithium battery floating charge control circuit is IN a constant charge state, a constant current signal may be output to the first input terminal IN1 and the second input terminal IN 2; if the UPS lithium battery floating charge control circuit is IN the floating charge state, a constant voltage signal can be output to the first input terminal IN1 and the second input terminal IN 2. The control unit 12 may be, for example, a battery management system BMS, and a specific structure thereof is well known to those skilled in the art and will not be described herein. The current voltage of the lithium battery can be monitored by the control unit 12; the preset floating charge voltage is a charge voltage in a floating charge state, and can be freely set by a user, preferably, the lithium battery 20 has a better preset floating charge voltage range after being manufactured, the range can be determined by the characteristics of the lithium battery 20, and the preset floating charge voltage can be set in the range; the voltage entering the floating charge indicates that if the voltage at the two ends of the lithium battery reaches the voltage entering the floating charge, the floating charge control circuit of the UPS lithium battery is controlled to enter a floating charge state, the specific value of the voltage entering the floating charge can be set by a user, and the voltage entering the floating charge can be set to be smaller than the preset floating charge voltage.
In this embodiment, if the battery enters the floating charge state, the first end a1 of the first switch unit 10 is conducted with the second end a2, and at this time, the charging power source charges the lithium battery 20 through the floating charge resistor 11, and the resistance of the floating charge resistor 20 is determined by the preset floating charge voltage, the voltage entering the floating charge, the power consumption of the UPS lithium battery floating charge control circuit and the preset formula, so that the charging power of the floating charge is less than or equal to the integrated power consumption of the UPS lithium battery floating charge control circuit (i.e., the power consumption of the UPS lithium battery floating charge control circuit), thereby ensuring that the lithium battery does not generate the overcharge phenomenon even if the lithium battery is in the floating charge state for a long time. It should be noted that the integrated power consumption of the UPS lithium battery floating charge control circuit may include BMS power consumption, power consumption of various relays in the UPS lithium battery floating charge control circuit, and other power consumption, and the determination or test method of the integrated power consumption of the UPS lithium battery floating charge control circuit is well known to those skilled in the art and will not be described herein again. When the first terminal a1 and the third terminal A3 of the first switch unit 10 are connected, the charging power source can directly charge the lithium battery, i.e. in a constant charging state, for example, a large current or a large power charging, and the lithium battery can be rapidly charged. The control unit 12 can control the UPS lithium battery floating charge control circuit to be in a floating charge state or a constant charge state according to the voltage of the lithium battery, so that the lithium battery can be charged quickly and safely, and the service life of the lithium battery is prolonged. The floating charge state refers to that the lithium battery can be kept in a full charge state as much as possible under the action of terminal voltage without overcharging; the constant charging state is a state that when the voltage of the battery is lower, the external voltage charges the lithium battery, so that the voltage of the lithium battery is increased.
According to the technical scheme of the embodiment, the adopted UPS lithium battery floating charge control circuit comprises a first input end, a second input end, a first output end, a second output end, a first switch unit, a floating charge resistor and a control unit; the first input end and the second input end are used for being connected with a charging power supply, and the first output end and the second output end are used for being electrically connected with the lithium battery; the control unit is used for controlling the floating charge control circuit of the UPS lithium battery to be in a constant charge state or a floating charge state according to the current voltage of the lithium battery, the preset floating charge voltage and the voltage entering the floating charge in the charging stage; the first switch unit is configured to conduct the first end and the second end of the first switch unit according to a first control signal of the control unit so as to enable the floating charge control circuit of the UPS lithium battery to be in a floating charge state, and conduct the first end and the third end of the first switch unit according to a second control signal of the control unit so as to enable the floating charge control circuit of the UPS lithium battery to be in a constant charge state; the second end of the floating charge resistor is electrically connected with the first output end; the resistance value of the floating charge resistor is determined by a preset floating charge voltage, a voltage entering the floating charge, the power consumption of the floating charge control circuit of the UPS lithium battery and a preset formula. The controllable UPS lithium cell of the control unit floats and fills control circuit for floating and filling the state or constantly filling the state to make the UPS lithium cell float and fill control circuit can charge the lithium cell fast and safely, and under the state of filling floating, owing to float the effect of filling resistance, make the power consumption that floats the charging power less than or equal to UPS lithium cell float and fill control circuit, and then guarantee that the lithium cell is in for a long time and float the state of filling, also can not produce the overcharge phenomenon.
Optionally, the preset formula is: r is not less than (U)0-U) U)/P; wherein R is the resistance value of the floating charge resistor, U0The voltage of the floating charge is preset, U is the voltage entering the floating charge, and P is the power consumption of the floating charge control circuit of the UPS lithium battery.
Specifically, the charging power of the float charge is ((U)0-U)/R) U, and P is the power consumption of the floating charge control circuit of the UPS lithium battery, i.e. the requirement of ensuring ((U)/R)0-U)/R) U.ltoreq.P, and R.gtoreq ((U)/R)0U)/P, namely, the floating charge resistance is set through the preset formula, so that the charging power of the floating charge is ensured to be less than or equal to the power consumption of the floating charge control circuit of the UPS lithium battery, and further, the phenomenon of over-charge cannot be generated even if the lithium battery is in a floating charge state for a long time. Preferably, R may be set>((U0-U)U)/P。
Optionally, the floating charge resistor may be a variable resistor, the resistance ranges of the floating charge resistors which may be required by different lithium batteries are different, and the floating charge resistor is set as the variable resistor, so that the application range of the UPS lithium battery floating charge control circuit can be expanded.
Optionally, as shown in fig. 1 and fig. 2, the UPS lithium battery floating charge control circuit may further include a DC-DC converter 13, where the DC-DC converter 13 is capable of supplying power to a module (e.g., the control unit 12) of the UPS lithium battery floating charge control circuit that needs power, in this embodiment, an input terminal of the DC-DC converter 13 may be electrically connected to the first output terminal and the second output terminal of the UPS lithium battery floating charge control circuit, respectively, that is, the DC _ DC converter 13 is supplied with power through a lithium battery, without external power supply, so as to improve the integration level.
Exemplarily, fig. 3 is a schematic circuit structure diagram of a UPS lithium battery floating charge control circuit electrically connected to a lithium battery according to an embodiment of the present invention, and referring to fig. 3, the first switch unit includes a single-pole double-throw relay 101; the coil 1011 of the single-pole double-throw relay 101 is electrically connected to the control unit 12 (connection relationship is not shown), the first end of the single-pole double-throw switch 1012 in the single-pole double-throw relay 101 serves as the first end of the first switch unit 10, the second end of the single-pole double-throw switch serves as the second end of the first switch unit, the third end of the single-pole double-throw switch serves as the third end of the first switch unit, and the single-pole double-throw switch can conduct the first end thereof with the second end thereof or conduct the first end thereof with the third end thereof.
Specifically, the single-pole double-throw switch 1012 can switch the on-state according to whether a working current flows through the corresponding coil 1011, for example, when the working current flows through the corresponding coil 1011, the first end and the second end of the single-pole double-throw switch are attracted, and the first end and the third end of the single-pole double-throw switch are disconnected at this time, so that the UPS lithium battery floating charge control circuit is in a floating charge state; when no working current flows through the corresponding coil 1011, the first end and the second end of the single-pole double-throw switch are disconnected, and the first end and the third end of the single-pole double-throw switch are attracted at the moment, so that the floating charge control circuit of the UPS lithium battery is in a constant charge state. In the embodiment, the switching between the floating charge state and the constant charge state can be completed only by one single-pole double-throw switch, and the number of components in the floating charge control circuit of the UPS lithium battery is small, so that the cost and the power consumption are reduced. It should be noted that the coil 1011 corresponding to the single-pole double-throw switch 1012 may be configured to conduct the first terminal and the third terminal thereof when an operating current flows therethrough, and to conduct the first terminal and the second terminal thereof when no operating current flows therethrough.
Optionally, in the constant charge stage, the control unit 12 is configured to generate a first control signal after a first preset time if it is detected that the current voltage of the lithium battery is greater than the voltage entering the floating charge, and the single-pole double-throw relay is configured to conduct a first end of the single-pole double-throw switch 1012 and a second end of the single-pole double-throw switch 1012 according to the first control signal, and to turn off the first end of the single-pole double-throw switch 1012 and a third end of the single-pole double-throw switch 1012; if it is detected that the current voltage of the lithium battery is less than or equal to the voltage entering the floating charge, a second control signal is generated after a second preset time, and the single-pole double-throw relay 101 is configured to conduct the first end of the single-pole double-throw switch 1012 and the third end of the single-pole double-throw switch 1012 according to the second control signal, and to turn off the first end of the single-pole double-throw switch 1012 and the second end of the single-pole double-throw switch 1012.
Specifically, if the current voltage of the lithium battery is greater than the voltage entering the floating charge, it indicates that the lithium battery can be subjected to the floating charge, and the control unit may control to generate a first control signal after a first preset time, where the first control signal may be, for example, a high level, so that a first end and a second end of the single-pole double-throw switch are turned on, and the first end and a third end of the single-pole double-throw switch are turned off, that is, the UPS lithium battery floating charge control circuit enters a floating charge state; the first preset time may be, for example, 5 seconds or 0 second, and this is not particularly limited in the embodiment of the present invention. If the current voltage of the lithium battery is smaller than the voltage entering the floating charge, the voltage of the lithium battery at the moment is smaller, namely the electric quantity of the lithium battery at the moment is smaller, and the lithium battery needs to be charged quickly, so that the lithium battery can be controlled to be charged with large current or high power after a second preset time, namely a second control signal is generated, and the second control signal can be at a low level, so that the UPS lithium battery floating charge control circuit is in a constant charge state; the second preset time may be, for example, 5 seconds or 0 second, and this is not particularly limited in the embodiment of the present invention. In some other embodiments, the first control signal may be low, and the second control signal may be high.
For example, fig. 4 is a circuit structure in which a UPS lithium battery floating charge control circuit is electrically connected to a lithium battery according to an embodiment of the present invention, and referring to fig. 4, a first switching unit 10 includes a first relay 102 and a second relay 103; the first relay 102 includes a first coil and a first switch, and the second relay 103 includes a second coil and a second switch; the first coil and the second coil are electrically connected with the control unit; the first end of the first switch and the first end of the second switch are short-circuited and then serve as the first end of the first switch unit, the second end of the first switch serves as the second end of the first switch unit, and the second end of the second switch serves as the third end of the first switch unit.
Specifically, first relay 102 and second relay 103 all can be single-pole single-throw relays, and its on-state is controlled by independent control of control unit 12, and the state that also is first relay 102 can not influence the state of second relay 103, and the interference killing feature is stronger, and because can not influence each other between the state of first switch and second switch, and then can carry out more nimble configuration to floating charge control circuit. For example, the first relay 102 and the second relay 103 may be normally open relays, and when the working current flows through the first coil, the first switch is turned on, and when the working current does not flow, the first switch is turned off; when the working current flows through the second coil, the second switch is switched on, and when no working current flows through the second switch, the second switch is switched off. In other embodiments, the first relay and the second relay may be normally closed relays.
Optionally, in the constant charge state, the control unit is configured to generate a first control signal after a third preset time if it is detected that the current voltage of the lithium battery is greater than the voltage for entering the floating charge, generate a third control signal after a fourth preset time, turn on the first switch by the first relay 102 according to the first control signal, turn off the second switch by the second relay according to the control signal, and set the fourth preset time to be greater than or equal to the third preset time; if the current voltage of the lithium battery is detected to be smaller than or equal to the voltage for entering the floating charge, a second control signal is generated after a fifth preset time, a fourth control signal is generated after a sixth preset time, the second relay switches on the second switch according to the second control signal, the first relay switches off the first switch according to the fourth control signal, and the sixth preset time is larger than or equal to the fifth preset time.
Specifically, the UPS lithium battery floating charge control circuit may include a second switch unit 14, where the second switch unit 14 is connected between the second input end and the second output end, and is used for discharging the lithium battery; the UPS lithium battery floating charge control circuit may further include a unidirectional conducting device 15, where a current flowing direction of the unidirectional conducting device 15 is from a first end to a second end, the first end of the unidirectional conducting device is electrically connected to the second switch unit 14, the second end of the unidirectional conducting device is electrically connected to the first input end IN1 of the UPS lithium battery floating charge control circuit, and the unidirectional conducting device may be, for example, a diode; the UPS lithium battery floating charge control circuit may further include a third switching unit 16, where the third switching unit 16 is connected between the second input terminal IN2 and the second output terminal OUT2, and is used to control the conduction state of the second input terminal and the second output terminal.
The second switch unit 14 and the third switch unit 16 can be normally closed relays, the first output end OUT1 of the UPS lithium battery floating charge control circuit can be electrically connected with the positive electrode of the lithium battery, and the second output end OUT2 can be electrically connected with the negative electrode of the lithium battery; at this time, the first relay 102 may also be referred to as a float relay, the second relay 103 may also be referred to as a charge relay, the second switching unit 14 may also be referred to as a main positive relay, and the third switching unit 16 may also be referred to as a main negative relay; the main negative relay and the main positive relay form a discharging loop of the lithium battery, the main negative relay and the charging relay form a charging loop of the lithium battery, and the main negative relay and the floating charge relay form a floating charge loop of the lithium battery;
in this embodiment, in the permanent state of charging, main positive relay and main negative relay are closed state, if detect the current voltage of lithium cell and be greater than the voltage that gets into the floating charge, then carry out step 1: generating a first control signal after a third preset time, and generating a third control signal after a fourth preset time, wherein the fourth preset time is preferably longer than the third preset time, namely, it is detected that the lithium battery needs to be subjected to floating charge, the first switch can be closed after the third preset time, at the moment, the second switch is still in a closed state, and the second switch is opened after the fourth preset time, so that the charging voltage at two ends of the lithium battery is not excessively changed when the state of the lithium battery is switched, and the charging safety can be improved; if the current voltage of the lithium battery is detected to be less than or equal to the voltage entering the floating charge, which indicates that the lithium battery needs to enter a constant charge state at the moment, the step 2 is carried out: the second control signal is generated after the fifth preset time, the fourth control signal is generated after the sixth preset time, the sixth preset time can be preferably longer than the fifth preset time, namely, it is detected that the lithium battery needs to be charged with large current or high power, the second switch can be closed after the fifth preset time, at the moment, the first switch is still in a closed state, and the first switch is disconnected after the sixth preset time, so that the charging voltage at two ends of the lithium battery is not changed too much when the state of the lithium battery is switched, and the charging safety can be improved.
It should be noted that the voltage of the lithium battery in the constant charging phase will change continuously, and the control unit 12 will switch back and forth between step 1 and step 2. The third preset time, the fourth preset time, the fifth preset time and the sixth preset time may all be set by a user, which is not specifically limited in the embodiment of the present invention, and the third preset time may be, for example, 5 seconds, the fourth preset time may be slightly greater than 5 seconds, the fifth preset time may be, for example, 5 seconds, and the sixth preset time may be slightly greater than 5 seconds.
Optionally, the control unit 12 is further configured to generate a fifth control signal at the initial stage of charging, and the first switch unit turns on the first terminal and the second terminal thereof according to the fifth control signal and turns off the first terminal and the third terminal thereof.
Specifically, in this embodiment, a charging initial stage, that is, a period of time after the UPS lithium battery floating charge control circuit is powered on, and a duration of the charging initial stage may be, for example, 10 seconds, when the UPS lithium battery floating charge control circuit is powered on, after the UPS lithium battery floating charge control circuit is powered on and has no fault, the main positive relay and the main negative relay are controlled to be closed, and the first end and the second end of the first switch unit are controlled to be connected, that is, the floating charge relay is closed, and the charging relay is disconnected. And entering a charging stage after the initial charging stage is finished, judging the current voltage of the lithium battery, entering a step 1 if the current voltage is greater than the voltage entering the floating charge, entering a step 2 if the current voltage is less than or equal to the voltage entering the floating charge, and then circularly executing between the step 1 and the step 2.
Optionally, the preset floating charge voltage is less than the charge protection voltage of the lithium battery, and the voltage entering the floating charge is less than the preset floating charge voltage.
Specifically, the preset floating charge voltage can be set to be smaller than the charge protection voltage of the lithium battery, so that the lithium battery is ensured to enter a floating charge state before entering charge protection, and the charge safety of the lithium battery is further ensured. It should be noted that, the charging protection voltage of the lithium battery may be determined according to actual measurement, for example, if the lithium battery includes 74 battery cells, and the cell protection voltage of each battery cell is 3.65V, the maximum total voltage of the lithium battery is 74 × 3.65 — 259V, and because there is a consistency problem in the battery, when the voltage of the lithium battery is lower than 259V, some cell cells have already reached the protection voltage of 3.65V; according to the actual measurement result, when the individual single body reaches the protection voltage (3.65V), the total voltage of the lithium battery is about 251V, so that the charging protection voltage of the lithium battery can be set to be 251V; at this time, the preset float charge voltage can be set to be 247.5V, and the voltage entering the float charge is set to be 246.6V; according to actual measurement, the power consumption of the UPS lithium battery floating charge control circuit is 12W, and accordingly the resistance value of the floating charge resistor can be further calculated.
The embodiment of the invention also provides a lithium battery system which comprises the UPS lithium battery floating charge control circuit and the lithium battery provided by any embodiment of the invention; the positive pole of lithium cell is connected with first output electricity, and the negative pole of lithium cell is connected with the second output electricity. The UPS lithium battery floating charge control circuit provided by any embodiment of the invention has the same beneficial effects, and is not described in detail herein.
The embodiment of the invention also provides a UPS lithium battery charging control method, which is executed by a lithium battery system and comprises the following steps: when the lithium battery is in a constant charging state and the current voltage of the lithium battery is greater than the preset voltage for entering the floating charging state, the control unit generates a first control signal after a first preset time, and the lithium battery enters the floating charging state;
when the lithium battery is in a floating charge state and the current voltage of the lithium battery is less than or equal to the preset voltage for entering the floating charge state, the control unit generates a second control signal after a second preset time, and the lithium battery enters a constant charge state;
wherein, float and fill resistance, predetermine float charge voltage, get into the voltage that float and fill and UPS lithium cell float and fill control circuit's consumption and satisfy:
r is not less than (U)0-U) U)/P; r is the resistance value of the floating charge resistor, U0The voltage of the floating charge is preset, U is the voltage entering the floating charge, and P is the power consumption of the floating charge control circuit of the UPS lithium battery. Preferably, R>((U0-U) U)/P. For the specific steps of the UPS lithium battery charging control method, reference may be made to the description of the UPS lithium battery floating charge control circuit portion in the embodiment of the present invention, and details are not described herein.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. The utility model provides a UPS lithium cell floats fills control circuit which characterized in that, UPS lithium cell floats fills control circuit and includes:
the first input end, the second input end, the first output end, the second output end, the first switch unit, the floating charge resistor and the control unit;
the first input end and the second input end are used for being connected with a charging power supply, and the first output end and the second output end are used for being electrically connected with a lithium battery;
the control unit is used for controlling the UPS lithium battery floating charge control circuit to be in a constant charge state or a floating charge state according to the current voltage of the lithium battery, the preset floating charge voltage and the voltage entering the floating charge in the charging stage;
the first switch unit is configured to conduct the first end and the second end of the first switch unit according to a first control signal of the control unit so as to enable the UPS lithium battery floating charge control circuit to be in a floating charge state, and conduct the first end and the third end of the first switch unit according to a second control signal of the control unit so as to enable the UPS lithium battery floating charge control circuit to be in a constant charge state; the second end of the floating charge resistor is electrically connected with the first output end;
the resistance value of the floating charge resistor is determined by the preset floating charge voltage, the voltage entering the floating charge, the power consumption of the UPS lithium battery floating charge control circuit and a preset formula.
2. The UPS lithium battery floating charge control circuit of claim 1, wherein the predetermined formula is: r is not less than (U)0-U) U)/P; wherein R is the resistance value of the floating charge resistor, U0And the preset floating charge voltage is U, the voltage entering the floating charge is U, and P is the power consumption of the UPS lithium battery floating charge control circuit.
3. The UPS lithium battery float charge control circuit of claim 1, wherein the first switching unit comprises a single pole double throw relay;
a coil of the single-pole double-throw relay is electrically connected with the control unit, a first end of a single-pole double-throw switch in the single-pole double-throw relay serves as a first end of the first switch unit, a second end of the single-pole double-throw switch serves as a second end of the first switch unit, and a third end of the single-pole double-throw switch serves as a third end of the first switch unit; the single-pole double-throw switch can conduct the first end with the second end or conduct the first end with the third end.
4. The UPS lithium battery floating charge control circuit of claim 3, wherein in a constant charge phase, the control unit is configured to generate the first control signal after a first preset time if it is detected that the current voltage of the lithium battery is greater than the voltage entering the floating charge, and the single-pole double-throw relay is configured to turn on a first end of the single-pole double-throw switch and a second end of the single-pole double-throw switch according to the first control signal and turn off the first end of the single-pole double-throw switch and a third end of the single-pole double-throw switch;
if the current voltage of the lithium battery is detected to be less than or equal to the voltage entering the floating charge, generating a second control signal after a second preset time, wherein the single-pole double-throw relay is configured to conduct the first end of the single-pole double-throw switch and the third end of the single-pole double-throw switch according to the second control signal and to turn off the first end of the single-pole double-throw switch and the second end of the single-pole double-throw switch.
5. The UPS lithium battery floating charge control circuit of claim 1, wherein the first switching unit comprises a first relay and a second relay;
the first relay comprises a first coil and a first switch, and the second relay comprises a second coil and a second switch;
the first coil and the second coil are electrically connected with the control unit;
a first end of the first switch and a first end of the second switch are short-circuited and then serve as a first end of the first switch unit, a second end of the first switch serves as a second end of the first switch unit, and a second end of the second switch serves as a third end of the first switch unit;
preferably, in the constant charging stage, the control unit is configured to generate the first control signal after a third preset time if it is detected that the current voltage of the lithium battery is greater than the voltage for entering the floating charging, generate a third control signal after a fourth preset time, turn on the first switch by the first relay according to the first control signal, turn off the second switch by the second relay according to the third control signal, and set the fourth preset time to be greater than or equal to the third preset time; if the current voltage of the lithium battery is detected to be smaller than or equal to the voltage for entering the floating charge, the second control signal is generated after a fifth preset time, a fourth control signal is generated after a sixth preset time, the second relay conducts the second switch according to the second control signal, the first relay turns off the first switch according to the fourth control signal, and the sixth preset time is larger than or equal to the fifth preset time.
6. The UPS lithium battery floating charge control circuit of claim 1, wherein the control unit is further configured to generate a fifth control signal at an initial stage of charging, and the first switch unit switches the first terminal and the third terminal of the first switch unit on and switches the first terminal and the third terminal of the first switch unit off according to the fifth control signal.
7. The UPS lithium battery float control circuit of claim 1, wherein the predetermined float voltage is less than a charge protection voltage of the lithium battery, and the voltage entering float is less than the predetermined float voltage.
8. The UPS lithium battery floating charge control circuit of claim 1, further comprising:
the second switch unit is connected between the first input end and the first output end and used for discharging the lithium battery; and/or the presence of a gas in the gas,
and the third switching unit is connected between the second input end and the second output end and is used for controlling the conduction state of the second input end and the second output end.
9. A lithium battery system comprising a lithium battery and the UPS lithium battery floating charge control circuit of any of claims 1-8;
the positive pole of lithium cell with first output electricity is connected, the negative pole of lithium cell with the second output electricity is connected.
10. A UPS lithium battery charging control method performed by the lithium battery system of claim 9, the method comprising:
when the lithium battery is in a constant charging state and the current voltage of the lithium battery is greater than the preset voltage for entering the floating charging state, the control unit generates a first control signal after a first preset time, and the lithium battery enters the floating charging state;
when the lithium battery is in a floating charge state and the current voltage of the lithium battery is less than or equal to the preset voltage for entering the floating charge state, the control unit generates a second control signal after a second preset time, and the lithium battery enters a constant charge state;
wherein, float and fill resistance, predetermine float charge voltage, get into the voltage that float and fill and UPS lithium cell float and fill control circuit's consumption and satisfy:
R≥((U0-U) U)/P; r is the resistance value of the floating charge resistor, U0And the preset floating charge voltage is U, the voltage entering the floating charge is U, and P is the power consumption of the UPS lithium battery floating charge control circuit.
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