CN112886684B - Charging and discharging management circuit and system for multiple lithium batteries - Google Patents
Charging and discharging management circuit and system for multiple lithium batteries Download PDFInfo
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- CN112886684B CN112886684B CN202110322058.8A CN202110322058A CN112886684B CN 112886684 B CN112886684 B CN 112886684B CN 202110322058 A CN202110322058 A CN 202110322058A CN 112886684 B CN112886684 B CN 112886684B
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- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 68
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims description 54
- 238000007599 discharging Methods 0.000 title claims description 49
- 230000008859 change Effects 0.000 claims description 6
- 230000000087 stabilizing effect Effects 0.000 claims description 5
- 230000006870 function Effects 0.000 description 36
- 230000006872 improvement Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000003792 electrolyte Substances 0.000 description 2
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 239000011255 nonaqueous electrolyte Substances 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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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
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
-
- 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
- H02J7/36—Arrangements using end-cell switching
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a multi-lithium battery charge and discharge management circuit, wherein a first port is connected with a battery serial function switch tube, a second port is connected with a battery parallel function switch tube, when a control circuit starts the battery parallel function switch tube through a port B, a battery pack is in a parallel state, a port E starts the charge management circuit to charge the battery pack, when the control circuit starts the battery serial function switch tube through a port A and closes the battery parallel function switch tube, the battery pack supplies power to a load through a discharge circuit, the port A detects the voltage and the current of the battery pack, and the load is connected with the discharge management circuit.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a charging and discharging management circuit and system for a plurality of lithium batteries.
Background
The lithium battery has the advantages of small volume, high energy density, no memory effect, high voltage, low self-discharge rate and the like, and more electronic devices such as mobile phones, electric vehicles, bluetooth devices and the like begin to adopt the lithium battery as a main power supply.
The lithium battery has a certain risk in the charging and discharging process due to high energy density, and when the temperature of the lithium battery is increased in an overcharged state, electrolyte in the lithium battery can be decomposed to generate gas, so that the internal pressure of the lithium battery is increased to rupture and catch fire. At present, many inferior lithium battery charging management systems are unreasonable in design, and the lithium battery is in an overcharged state, so that danger occurs, and the safety and reliability are low. Meanwhile, due to the process difference between single lithium batteries, the state of the single lithium battery cannot be monitored in real time in the traditional multi-section charge-discharge management system, and the management of the whole system is not facilitated.
Disclosure of Invention
In view of the above, the present invention provides a multi-lithium battery charge-discharge management circuit and system for monitoring and displaying charge-discharge states of each lithium battery in a battery pack in real time and improving working stability of charge-discharge of the lithium battery, which can solve the above technical problems.
In a first aspect, the invention provides a charging and discharging management circuit for a plurality of lithium batteries, which comprises a control circuit, a switch circuit, a battery pack connected in the switch circuit, a charging management circuit and a discharging management circuit, wherein the switch circuit and the charging management circuit are connected with the control circuit, and the switch circuit, the charging management circuit and the discharging management circuit are connected with the battery pack;
the control circuit comprises a control chip with a plurality of ports, and the ports of the control chip are correspondingly connected with the switch circuit, the charge management circuit and the discharge management circuit respectively;
the switching circuit comprises a battery serial functional switching tube, a battery parallel functional switching tube, a first port and a second port, wherein the battery serial functional switching tube is connected with a port A of the control circuit through the first port, and the battery parallel functional switching tube is connected with a port B of the control circuit through the second port;
the charging management circuit is used for controlling the opening and closing of a charging circuit of the battery pack and is connected to a port E of the control circuit, the charging circuit is connected with a port C and a port D of the control circuit, and the discharging management circuit is connected with a port F of the control circuit and is used for controlling the opening and closing of a discharging circuit of the battery pack;
when the control circuit starts the battery parallel function switching tube through the port B, the battery pack is in a parallel state, and the port E starts the charge management circuit to charge the battery pack;
when the control circuit starts the battery serial function switching tube and closes the battery parallel function switching tube through the port A, the battery pack supplies power to a load through the discharging circuit, the port A detects the voltage and the current of the battery pack, and the load is connected with the discharging management circuit.
As a further improvement of the above technical solution, when the control circuit turns on the battery parallel function switching tube through the port B, the method further includes:
and judging the charging state of the battery pack through the voltage change of the charging circuit by the port C and the port D, and closing the discharge management circuit when the voltage reaches a first preset threshold value.
As a further improvement of the above technical solution, when the control circuit turns on the battery serial function switching tube and turns off the battery parallel function switching tube through the port a, the control circuit further includes:
when the output current or the output voltage of the discharging circuit is detected to be reduced to a second preset threshold value, the charging state of the battery pack is judged to be insufficient, the control circuit turns off the discharging management circuit through the port F, and the battery pack stops supplying power to the load.
As a further improvement of the above technical solution, the battery serial functional switching tube includes a first switching tube and a second switching tube, the gate of the first switching tube is shorted with the gate of the second switching tube, the battery parallel functional switching tube includes a third switching tube and a fourth switching tube, and the gate of the third switching tube is shorted with the gate of the fourth switching tube;
the battery pack comprises a first battery and a second battery, wherein the first battery is connected with the drain electrode of the first switch tube and the drain electrode of the third switch tube, the second battery is connected with the source electrode of the second switch tube and the drain electrode of the fourth switch tube, the source electrode of the first switch tube is connected with the drain electrode of the second switch tube, the drain electrode of the third switch tube is connected to the second battery, the charge management circuit and the circuit where the discharge management circuit is located, and the source electrode of the fourth switch tube is connected to the first battery, the charge management circuit and the circuit where the discharge management circuit is located.
As a further improvement of the above technical solution, the charge management circuit includes a fifth switching tube, a diode, a first resistor, a second resistor, a first triode and a second triode;
the grid of fifth switch tube with port E is connected, the drain electrode of fifth switch tube with port D is connected, the source electrode of fifth switch tube with group battery is connected, the negative pole of diode is connected to port D, first resistance the projecting pole of first triode with the positive pole of diode is connected, the base of first triode with first resistance is connected, the collecting electrode of first triode with the base of second triode, the second resistance is connected, the collecting electrode of second triode with first resistance is connected, the transmitter of second triode with port C is connected, the second resistance with the group battery is connected.
As a further improvement of the technical scheme, the fifth switching tube is a MOS switching tube, the diode is a freewheeling diode, and the first resistor and the second resistor are voltage stabilizing resistors.
As a further improvement of the above technical solution, the discharge management circuit includes a sixth switching tube, a third resistor, a fourth resistor, a fifth resistor and a third triode;
the grid of sixth switching tube with port F is connected, the source of sixth switching tube with the group battery is connected, the drain electrode of sixth switching tube with the load is connected, the input of third resistance with charge management circuit is connected, the collecting electrode of third triode with the output of third resistance is connected, the projecting pole of third triode with the input of fifth resistance is connected, the base of third triode with the input of fourth resistance is connected, the output ground of fifth resistance, the output of fourth resistance with the load is connected.
As a further improvement of the technical scheme, the sixth switching tube is a depletion type MOS tube, and the third resistor, the fourth resistor and the fifth resistor are voltage stabilizing resistors.
In a second aspect, the present invention further provides a charging and discharging management system for multiple lithium batteries, including the charging and discharging management circuit for multiple lithium batteries, where the charging and discharging management system for multiple lithium batteries further includes:
the power supply module is connected with the control circuit and is used for supplying power to the control circuit;
and the display module is connected with the control circuit and used for displaying the charging state or the discharging state of the battery pack.
The invention provides a charging and discharging management circuit and a charging and discharging management system for a plurality of lithium batteries, which have the following beneficial effects:
the serial connection or the parallel connection of the lithium battery pack is controlled through a plurality of ports of the control circuit, the first port is connected with a battery serial connection function switching tube, and the second port is connected with a battery parallel connection function switching tube. When the control circuit opens the battery parallel function switching tube through the port B, the battery pack is in a parallel state, the port E opens the charge management circuit to charge the battery pack, when the control circuit opens the battery serial function switching tube through the port A and closes the battery parallel function switching tube, the battery pack supplies power to the load through the discharge circuit, the port A detects the voltage and current of the battery pack, and the load is connected with the discharge management circuit, so that the problem that the charge and discharge states of the single lithium battery cannot be monitored in real time is solved, the working stability and reliability of charge and discharge management of the multiple lithium batteries are improved, and the risk of overcharge and overdischarge of the multiple lithium battery packs is also reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a block diagram of a charge and discharge management circuit for a multi-lithium battery according to an embodiment of the present invention;
fig. 2 is a schematic circuit diagram of a charge-discharge management circuit for a plurality of lithium batteries according to an embodiment of the present invention;
fig. 3 is a block diagram of a charging and discharging management system for a plurality of lithium batteries according to an embodiment of the present invention.
Description of main reference numerals:
100-a lithium battery charge-discharge management circuit; 110-a control circuit; 120-switching circuitry; 121-a battery serial function switching tube; 1211-a first switching tube; 1212-a second switching tube; 122-a battery parallel function switching tube; 1221-a third switching tube; 1222-fourth switching tube; 123-first port; 124-a second port; 130-battery pack; 131-a first battery; 132-a second battery; 140-a charge management circuit; 141-a fifth switching tube; 142-diode; 143-a first triode; 144-a second triode; 145-a first resistor; 146-a second resistor; 150-a discharge management circuit; 151-sixth switching tube; 152-a third resistor; 153-fourth resistance; 154-fifth resistor; 155-a third triode; 200-a charging and discharging management system of a plurality of lithium batteries; 210-a power module; 220-display module.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 1 and 2, the present invention provides a multi-lithium battery charge-discharge management circuit 100, which includes a control circuit 110, a switch circuit 120, a battery pack 130 connected in the switch circuit 120, a charge management circuit 140 and a discharge management circuit 150, wherein the switch circuit 120 and the charge management circuit 140 are connected with the control circuit 110, and the switch circuit 120, the charge management circuit 140 and the discharge management circuit 150 are connected with the battery pack 130;
the control circuit 110 includes a control chip including a plurality of ports, and the plurality of ports of the control chip are respectively and correspondingly connected to the switch circuit 120, the charge management circuit 140 and the discharge management circuit 150;
the switch circuit 120 includes a battery serial functional switch tube 121, a battery parallel functional switch tube 122, a first port 123 and a second port 124, the battery serial functional switch tube 121 is connected with a port a of the control circuit 110 through the first port 123, and the battery parallel functional switch tube 122 is connected with a port B of the control circuit 110 through the second port 124;
the charge management circuit 140 is configured to control opening and closing of a charge circuit of the battery pack 130 and is connected to a port E of the control circuit 110, the charge circuit is connected to a port C and a port D of the control circuit 110, and the discharge management circuit 150 is connected to a port F of the control circuit 110 and is configured to control opening and closing of a discharge circuit of the battery pack 130;
when the control circuit 110 turns on the battery parallel function switching tube 122 through the port B, the battery pack 130 is in a parallel state, and the port E turns on the charge management circuit 140 to charge the battery pack 130;
when the control circuit 110 turns on the battery serial function switching tube 121 and turns off the battery parallel function switching tube 122 through the port a, the battery pack 130 supplies power to a load through the discharge circuit, the port a detects the voltage and current of the battery pack 130, and the load is connected with the discharge management circuit 150.
In this embodiment, the lithium battery generally uses manganese dioxide as the positive electrode material, lithium metal or its alloy as the negative electrode material, and uses a nonaqueous electrolyte solution, and the lithium battery has the characteristics of high energy, high power bearing capacity, light weight, and the like. The control circuit comprises a control chip with a plurality of ports, the control chip can be an STM32 chip, and the control chip has the characteristics of high cost performance, good control stability and good preparation effect on the subsequent system upgrading, and each port is connected with different circuits or components so as to realize different functions. The switch circuit 120 includes 4 sets of switch MOS transistors, that is, a battery serial function switch transistor 121 and a battery parallel function switch transistor 122, where the battery serial function switch transistor 121 is formed by two sets of switch MOS transistors, and the battery parallel function switch transistor 122 is also formed by two sets of switch MOS transistors, and preferably, the types and parameters of four sets of switch MOS transistors are the same, so as to implement the current magnitude of the charge management circuit 140 or the discharge management circuit 150, so as to improve the working stability of the circuit.
Specifically, the battery serial connection function switching tube 121 includes a first switching tube 1211 and a second switching tube 1212, the first switching tube 1211 and the second switching tube 1212 are connected in series through a first port 123, that is, the gate of the first switching tube 1211 is shorted to the gate of the second switching tube 1212, the battery parallel connection function switching tube 122 includes a third switching tube 1221 and a fourth switching tube 1222, the gate of the third switching tube 1221 is shorted to the gate of the fourth switching tube 1222, the battery pack 130 includes a first battery 131 and a second battery 132, the first battery 131 is connected to the drain of the first switching tube 1211, the drain of the third switching tube 1221 is connected to the source of the second switching tube 1212, the source of the first switching tube 1211 is connected to the drain of the second switching tube 1212, the drain of the third switching tube 1221 is connected to the second battery 132, the charge management circuit 140 and the discharge management circuit 150, and the source of the fourth switching tube 1222 is connected to the first battery 131, the drain of the charge management circuit 140 and the discharge management circuit 150.
It should be appreciated that the first port 123 is connected to the port a of the control circuit 110, the second port 124 is connected to the port B of the control circuit 110, and the first battery 131 and the second battery 132 are in a series state when the first switch tube 1211 and the second switch tube 1212 are simultaneously turned on, and the third switch tube 1221 and the fourth switch tube 1222 are in an off state. When the first switch tube 1211 and the second switch tube 1212 are in the off state, the third switch tube 1221 and the fourth switch tube 1222 are turned on, the first battery 131 and the second battery 132 are in the parallel state, the first battery 131 and the second battery 132 are connected in series to perform discharge management, and the first battery 131 and the second battery 132 are connected in parallel to perform charge management separately, so that the working modes of multiple lithium batteries can be flexibly switched, and the working efficiency of charging and discharging the multiple lithium batteries can be improved.
It should be noted that, the charge management circuit 140 is configured to control on or off of a charging circuit of the battery pack 130, the charge management circuit 140 is connected to the port E of the control circuit 110, the charging circuit is connected to the port C and the port D of the control circuit 110, the first battery 131 and the second battery 132 in the charging circuit are connected in parallel, that is, the port C of the control circuit 110 is connected in series with the second battery 132, and the port D of the control circuit 110 is connected in series with the first battery 131. The discharge management circuit 150 is connected to the port F of the control circuit 110 for controlling the on or off of the discharge circuit of the battery pack 130. When the control circuit 110 is connected to the first port 123 through the port a and turns on the battery serial function switching tube 121, and simultaneously the control circuit 110 turns off the battery parallel function switching tube 122 through the port B, the control circuit 110 turns on the discharge management circuit 150 through the port F, and the battery pack 130 supplies power to the load connected to the discharge management circuit 150 through the discharge circuit connected to the discharge management circuit 150. When the control circuit 110 is connected with the second port 124 through the port B and turns on the battery parallel function switching tube 122, and simultaneously the control circuit 110 turns on the charge management circuit 140 through the port E, so as to charge the first battery 131 and the second battery 132 in the battery pack 110, thereby enhancing the charge reliability of the lithium battery and reducing the risk of overcharging and overdischarging of the lithium battery pack.
Optionally, when the control circuit 110 turns on the battery parallel function switching tube 122 through the port B, it further includes:
the port C and the port D determine the charge state of the battery pack 130 according to the voltage change of the charging circuit, and close the discharge management circuit 150 when the voltage reaches a first preset threshold.
In this embodiment, the overcharge may cause the electrolyte in the lithium battery to generate heat and decompose to generate gas, and the gas forms pressure inside the sealed battery, so that the lithium battery expands, and if the separator breaks during the expansion process, the contact between the positive electrode and the negative electrode may cause short circuit and fire. Also, the high power overdischarge of the outside also causes the expansion of heat in the battery, and the risk of fire is caused by the damage process similar to overcharge. The first preset threshold is the rated voltage of the lithium battery, such as 15V, when the lithium battery is charged, the battery pack is charged through the reasonable control of the control circuit, meanwhile, the port C and the port D can judge the charging state of the battery pack through the voltage change of the load, the charging state can be the charging start, the charging middle or the charging completion, and the like, and when the voltage reaches the preset voltage for charging the lithium battery, the charging management circuit is closed to complete the charging process of the lithium battery pack, so that the charging safety of the lithium battery is improved.
Optionally, when the control circuit 110 turns on the battery serial function switching tube 121 and turns off the battery parallel function switching tube 122 through the port a, it further includes:
when detecting that the output current or the output voltage of the discharging circuit decreases to the second preset threshold, the control circuit 110 determines that the charging state of the battery pack 130 is a shortage of electric quantity, and turns off the discharging management circuit 150 through the port F, and the battery pack 130 stops supplying power to the load.
In this embodiment, the control circuit 110 is connected to the first port 123 through the port a, so that the first switch tube 1211 and the second switch tube 1212 are turned on, that is, the battery serial function switch tube 121 is turned on, and when the first battery 131 and the second battery 132 are connected in series, the battery pack 130 is in a discharging state, and the voltage or current gradually decreases. When detecting that the current output current or voltage of the battery pack 130 decreases to the second preset threshold, the second preset threshold may be 0.1A or 1V, and then it is determined that the charging state of the battery pack 130 is insufficient, that is, the battery pack 130 needs to be charged, the control circuit 110 turns off the discharge management circuit 150 through the port F, and stops the discharge process of the lithium battery, and meanwhile, the lithium battery pack does not supply power to the load any more, and the control circuit needs to switch the discharge state of the lithium battery to the charging state, so that the charge and discharge management reasonability of the lithium battery is improved.
Optionally, the charge management circuit 140 includes a fifth switch tube 141, a diode 142, a first resistor 145, a second resistor 146, a first triode 143, and a second triode 144;
the gate of the fifth switch tube 141 is connected to the port E, the drain of the fifth switch tube 141 is connected to the port D, the source of the fifth switch tube 141 is connected to the battery pack 130, the cathode of the diode 142 is connected to the port D, the emitter of the first transistor 143 is connected to the anode of the diode 142, the base of the first transistor 143 is connected to the first resistor 145, the collector of the first transistor 143 is connected to the base of the second transistor 144 and to the second resistor 146, the collector of the second transistor 144 is connected to the first resistor 145, the emitter of the second transistor 144 is connected to the port C, and the second resistor 146 is connected to the battery pack 130.
In this embodiment, the transistor is a semiconductor device for controlling current, and is used for amplifying a weak signal into an electric signal with a larger amplitude, and can also be used as a contactless switch. The fifth switch tube is a switch MOS tube, the diode is a freewheeling diode, the freewheeling diode is a diode matched with an inductive load for use and is generally used with an energy storage element, voltage and current mutation can be prevented, a passage is provided, the first resistor and the second resistor are voltage stabilizing resistors, the model and parameters of the first triode 143 and the second triode 144 are the same, the port C and the port D are connected with a charging management circuit, and the battery pack 130 can be charged rapidly, so that the charging time of a plurality of lithium batteries is saved.
Optionally, the discharge management circuit 150 includes a sixth switching tube 151, a third resistor 152, a fourth resistor 153, a fifth resistor 154, and a third triode 155;
the gate of the sixth switching tube 151 is connected to the port F, the source of the sixth switching tube 151 is connected to the battery pack 130, the drain of the sixth switching tube 151 is connected to the load, the input end of the third resistor 152 is connected to the charge management circuit 140, the collector of the third triode 155 is connected to the output end of the third resistor 152, the emitter of the third triode 155 is connected to the input end of the fifth resistor 154, the base of the third triode 155 is connected to the input end of the fourth resistor 153, the output end of the fifth resistor 154 is grounded, and the output end of the fourth resistor 153 is connected to the load.
In this embodiment, the sixth switching tube 151 is a depletion type MOS tube, the third resistor 152, the fourth resistor 153 and the fifth resistor 154 are voltage stabilizing resistors, the sixth switching tube 151 is in a normally open state for controlling the switch of the discharging circuit, and the third triode 155 plays a role of amplifying the discharging current, so as to improve the working stability of the charging and discharging management circuit of the multiple lithium batteries.
It should be noted that, when the battery pack 130 is in charging, the control circuit 110 turns on the third switch tube 1221 and the fourth switch tube 1222 through the port B, so that the batteries in the switch circuit 120 are in a parallel state, and meanwhile, the port E turns on the fifth switch tube 141, outputs a voltage through the port C and the port D, and charges the battery pack 130 after passing through the current amplifying function of the charging circuit, and the ports C and D can also determine the charging state of the battery pack 130 through the load change of the circuit voltage. When the battery pack 130 is in a discharging state, the control circuit 110 opens the first switch tube 1211 and the second switch tube 1212 through the port a, and simultaneously closes the third switch tube 1221 and the fourth switch tube 1222, so that the batteries in the switch circuit 120 are in a series state, and the sixth switch tube 151 is in a normally open state, at this time, after the series battery pack continuously supplies power to the load through a current amplifying function in the discharging circuit, the port a can also detect the voltage and current capability of the series battery, and when the output current or the voltage is detected to be reduced, the control circuit 110 turns off the sixth switch tube 151 through the port F to stop the output current of the battery pack to the load under the condition that the battery electric quantity is determined to be insufficient, thereby detecting the charging and discharging states of the multiple lithium batteries in real time and improving the charging and discharging safety of the multiple lithium batteries.
Referring to fig. 3, the present invention further provides a multi-lithium battery charging and discharging management system 200, including the multi-lithium battery charging and discharging circuit 100, where the multi-lithium battery charging and discharging management system 200 further includes:
a power module 210 connected to the control circuit for supplying power to the control circuit;
and the display module 220 is connected with the control circuit and is used for displaying the charging state or the discharging state of the battery pack.
In this embodiment, the power module 210 is configured to provide power to the control circuit, the power module 210 can convert an external ac voltage into a dc voltage, and the display module 220 is a display. The control circuit monitors the voltage or current change of the lithium battery pack in real time on the port A or the port B, the port C or the port D, judges the charge and discharge states of the battery pack, and provides data for the display, so that a user can conveniently and timely treat the abnormal condition of the circuit.
The invention provides a charging and discharging management circuit and a charging and discharging management system for a plurality of lithium batteries. When the control circuit opens the battery parallel function switching tube through the port B, the battery pack is in a parallel state, the port E opens the charge management circuit to charge the battery pack, when the control circuit opens the battery serial function switching tube through the port A and closes the battery parallel function switching tube, the battery pack supplies power to the load through the discharge circuit, the port A detects the voltage and current of the battery pack, and the load is connected with the discharge management circuit, so that the problem that the charge and discharge states of single lithium batteries cannot be monitored in real time is solved, the work stability and reliability of charge and discharge management of multiple lithium batteries are improved, and the risk of overcharge and overdischarge is reduced.
Any particular values in all examples shown and described herein are to be construed as merely illustrative and not a limitation, and thus other examples of exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
The above examples merely represent a few embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the present invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention.
Claims (5)
1. The charging and discharging management circuit for the lithium batteries is characterized by comprising a control circuit, a switch circuit, a battery pack, a charging management circuit and a discharging management circuit, wherein the battery pack, the charging management circuit and the discharging management circuit are connected in the switch circuit, the switch circuit and the charging management circuit are connected with the control circuit, and the switch circuit, the charging management circuit and the discharging management circuit are connected with the battery pack;
the control circuit comprises a control chip with a plurality of ports, and the ports of the control chip are correspondingly connected with the switch circuit, the charge management circuit and the discharge management circuit respectively;
the switching circuit comprises a battery serial functional switching tube, a battery parallel functional switching tube, a first port and a second port, wherein the battery serial functional switching tube is connected with a port A of the control circuit through the first port, and the battery parallel functional switching tube is connected with a port B of the control circuit through the second port;
the charging management circuit is used for controlling the opening and closing of a charging circuit of the battery pack and is connected to a port E of the control circuit, the charging circuit is connected with a port C and a port D of the control circuit, and the discharging management circuit is connected with a port F of the control circuit and is used for controlling the opening and closing of a discharging circuit of the battery pack;
when the control circuit starts the battery parallel function switching tube through the port B, the battery pack is in a parallel state, and the port E starts the charge management circuit to charge the battery pack;
when the control circuit starts the battery serial function switching tube and closes the battery parallel function switching tube through the port A, the battery pack supplies power to a load through the discharging circuit, the port A detects the voltage and the current of the battery pack, and the load is connected with the discharging management circuit;
when the control circuit opens the battery parallel function switching tube through the port B, the control circuit further comprises: the port C and the port D judge the charging state of the battery pack through the voltage change of the charging circuit, and when the voltage reaches a first preset threshold value, the charging management circuit is closed;
when the control circuit opens the battery serial function switching tube and closes the battery parallel function switching tube through the port A, the control circuit further comprises: when the output current or the output voltage of the discharging circuit is detected to be reduced to a second preset threshold value, the charging state of the battery pack is judged to be insufficient, the control circuit turns off the discharging management circuit through the port F, and the battery pack stops supplying power to the load.
2. The multi-lithium battery charge-discharge management circuit according to claim 1, wherein the battery serial functional switching tube comprises a first switching tube and a second switching tube, the grid electrode of the first switching tube is in short circuit with the grid electrode of the second switching tube, the battery parallel functional switching tube comprises a third switching tube and a fourth switching tube, and the grid electrode of the third switching tube is in short circuit with the grid electrode of the fourth switching tube;
the battery pack comprises a first battery and a second battery, wherein the first battery is connected with the drain electrode of the first switch tube and the drain electrode of the third switch tube, the second battery is connected with the source electrode of the second switch tube and the drain electrode of the fourth switch tube, the source electrode of the first switch tube is connected with the drain electrode of the second switch tube, the drain electrode of the third switch tube is connected to the second battery, the charge management circuit and the circuit where the discharge management circuit is located, and the source electrode of the fourth switch tube is connected to the first battery, the charge management circuit and the circuit where the discharge management circuit is located.
3. The multi-lithium battery charge-discharge management circuit of claim 1, wherein the charge management circuit comprises a fifth switching tube, a diode, a first resistor, a second resistor, a first triode, and a second triode;
the grid of fifth switch tube with port E is connected, the drain electrode of fifth switch tube with port D is connected, the source electrode of fifth switch tube with the group battery is connected, the negative pole of diode is connected to port D, first resistance the projecting pole of first triode with the positive pole of diode is connected, the base of first triode with first resistance is connected, the collecting electrode of first triode with the base of second triode, the second resistance is connected, the collecting electrode of second triode with first resistance is connected, the projecting pole of second triode with port C is connected, the second resistance with the group battery is connected.
4. The multi-lithium battery charge-discharge management circuit of claim 3, wherein the fifth switching tube is a MOS switching tube, the diode is a freewheeling diode, and the first resistor and the second resistor are voltage stabilizing resistors.
5. A multi-lithium battery charge-discharge management system, comprising the multi-lithium battery charge-discharge management circuit according to any one of claims 1 to 4, the multi-lithium battery charge-discharge management system further comprising:
the power supply module is connected with the control circuit and is used for supplying power to the control circuit;
and the display module is connected with the control circuit and used for displaying the charging state or the discharging state of the battery pack.
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| CN114039394B (en) * | 2021-11-12 | 2024-01-05 | 深圳市鑫飞宏电子有限公司 | Power supply management system and method |
| CN114039399B (en) * | 2022-01-10 | 2022-03-25 | 苏州贝克微电子股份有限公司 | Battery management system of low-power consumption |
| CN114633662B (en) * | 2022-03-25 | 2023-12-08 | 苏州赤兔驱动科技有限公司 | Double-lithium battery charge and discharge management method and electric vehicle energy management system applying same |
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