CN114448021A - Power supply system based on lithium battery pack charging - Google Patents

Power supply system based on lithium battery pack charging Download PDF

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Publication number
CN114448021A
CN114448021A CN202111449048.7A CN202111449048A CN114448021A CN 114448021 A CN114448021 A CN 114448021A CN 202111449048 A CN202111449048 A CN 202111449048A CN 114448021 A CN114448021 A CN 114448021A
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CN
China
Prior art keywords
lithium battery
module
battery pack
power supply
resistor
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Pending
Application number
CN202111449048.7A
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Chinese (zh)
Inventor
郭华北
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Shenzhen Lipower Power Supply Co ltd
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Shenzhen Lipower Power Supply Co ltd
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Priority to CN202111449048.7A priority Critical patent/CN114448021A/en
Publication of CN114448021A publication Critical patent/CN114448021A/en
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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
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • 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
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • H02J7/00036—Charger exchanging data with 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
    • H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
    • H02J7/00038—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange using passive battery identification means, e.g. resistors or capacitors
    • H02J7/00041—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange using passive battery identification means, e.g. resistors or capacitors in response to measured battery parameters, e.g. voltage, current or temperature profile
    • 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
    • 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
    • H02J7/0014—Circuits for equalisation of charge between batteries
    • 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
    • H02J7/0014—Circuits for equalisation of charge between batteries
    • H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
    • 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
    • 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
    • H02J7/00304—Overcurrent protection
    • 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
    • H02J7/00306—Overdischarge protection
    • 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
    • H02J7/00309—Overheat or overtemperature protection
    • 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
    • H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
    • 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
    • H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
    • 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
    • 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
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/20—Charging or discharging characterised by the power electronics converter

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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 belongs to the technical field of power supply, and discloses a power supply system based on lithium battery pack charging, which is characterized in that a lithium battery pack and a lithium battery management module are arranged, wherein the lithium battery pack comprises a plurality of lithium batteries, the lithium battery management module is connected with the lithium battery pack and comprises a selection terminal, the lithium batteries form a lithium battery string with 1-N battery sections under the selection of the selection terminal, the lithium battery string is a plurality of strings, the plurality of strings of lithium batteries are connected in series and in parallel to form the lithium battery pack, the lithium battery management module acquires dynamic parameters of the lithium battery pack and manages the lithium battery pack, so that the lithium battery pack is freely combined, various power supply selection technical effects are provided, and meanwhile, the dynamic parameters of the lithium battery pack under the action of the selection terminal are managed, and the technical effect of reasonable and safe power supply is realized.

Description

Power supply system based on lithium battery pack charging
Technical Field
The invention belongs to the technical field of power supply charging, and relates to a power supply system based on lithium battery pack charging.
Background
With the popularization of mobile electric devices such as mobile computers, mobile phones, wearable devices and electric vehicles, how to provide suitable power supplies for the mobile electric devices and guarantee the supply of electric quantity is always a problem of concern in the technical field of charging.
In the existing power supply, most power supplies are power supplies for a single scene, for example, only direct current power supply or only alternating current power supply is adopted, so that a lithium battery forming a power supply energy module of the power supply energy module generally has no flexibility in design, is simple in composition, and cannot provide multiple charging options.
In addition, because the lithium battery of the conventional power supply is simple in composition, a technical scheme for effectively protecting a complex lithium battery composition structure is not provided, and a charging management strategy for various complex charging scenes is not provided.
In summary, the conventional power supply has the following technical problems:
firstly, the lithium battery has simpler composition and cannot provide various charging options;
secondly, the technical scheme for effectively protecting the complex lithium battery composition structure is lacked;
third, charging management strategies for various complex charging scenarios are missing.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a power supply system based on lithium battery pack power supply, which comprises:
the lithium battery pack comprises a plurality of lithium batteries, the lithium batteries form a lithium battery string with 1-N battery sections under the selection of a selection terminal, the lithium battery string is a plurality of strings, and the plurality of strings of lithium batteries are connected in series and parallel to form the lithium battery pack; n is a natural number;
the lithium battery management module is connected with the lithium battery pack and comprises the selection terminal; and the lithium battery management module acquires the dynamic parameters of the lithium battery pack and manages the lithium battery pack.
Preferably, the dynamic parameters include the number of cells representing the change of the cell section number and the electrical property parameters representing the change of the electrical property of the lithium battery pack.
In an improvement, the power supply system based on the power supply of the lithium battery pack comprises a DC-DC module; and the DC-DC module is connected with the lithium battery management module and provides a direct current power supply to the outside.
In an improved mode, the power supply system based on the lithium battery pack power supply further comprises a main control module; the main control module is connected with the DC-DC module.
In an improved mode, the main control module monitors the functional state of the DC-DC module, and controls the warning module to perform abnormal alarm when the functional state of the DC-DC module is abnormal.
In an improvement, the main control module controls the DC-DC module to be switched on or off.
In an improvement, the power supply system based on the lithium battery pack power supply comprises a DC-AC module; and the DC-AC module is connected with the lithium battery management module and provides an alternating current power supply for the outside.
In the improvement, the power supply system based on the power supply of the lithium battery pack comprises a DC-AC module and a main control module; the DC-AC module is connected with the main control module, the DC-AC module is connected with the lithium battery management module, and the DC-AC module provides an alternating current power supply to the outside.
In an improved mode, the power supply system based on the power supply of the lithium battery pack comprises a DC-AC module, a main control module and a soft start module; the DC-AC module is connected with the main control module through the soft start module, the main control module is connected with the lithium battery management module, and the DC-AC module provides an alternating current power supply to the outside.
Specifically, the main control module controls the on or off of the DC-AC module.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the lithium battery pack comprises a plurality of lithium batteries and the lithium battery management module is arranged, the lithium battery management module is connected with the lithium battery pack and comprises a selection terminal, the plurality of lithium batteries form a lithium battery string with the number of 1-N battery sections under the selection of the selection terminal, the lithium battery string is a plurality of strings, the plurality of strings of lithium batteries are connected in series and in parallel to form the lithium battery pack, the lithium battery management module acquires dynamic parameters of the lithium battery pack and manages the lithium battery pack, so that the lithium battery pack is freely combined, the technical effects of various power supply selections are provided, and meanwhile, the dynamic parameters of the lithium battery pack under the action of the selection terminal are managed, and the technical effect of reasonable and safe power supply is realized.
Drawings
Fig. 1 is a schematic circuit diagram of a power supply system based on lithium battery pack power supply;
FIG. 2 is a schematic diagram of a circuit structure of a lithium battery management module;
FIG. 3 is a schematic diagram of another circuit configuration of a power supply system based on lithium battery pack power supply;
FIG. 4 is a schematic diagram of another circuit configuration of a power supply system based on lithium battery pack power supply;
FIG. 5 is a schematic diagram of another circuit of a power supply system based on lithium battery pack power supply;
FIG. 6 is a schematic diagram of an improved circuit structure of a power supply system based on lithium battery pack power supply;
fig. 7 is a schematic circuit diagram of the soft start module.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.
Example one
Referring to fig. 1, in order to overcome the defects of the prior art, the embodiment provides a power supply system based on power supply of a lithium battery pack, which includes a lithium battery pack and a lithium battery management module, and a specific circuit is described as follows.
On one hand, the lithium battery pack comprises a plurality of lithium batteries, the lithium batteries form a lithium battery string with 1-N battery sections under the selection of a selection terminal, the lithium battery string is a plurality of strings, and the plurality of strings of lithium batteries are connected in series and parallel to form the lithium battery pack; n is a natural number;
it should be noted that, the lithium battery pack constructed by using multiple lithium batteries is a basis for selecting multiple power supply strategies. In the embodiment, a plurality of lithium batteries are utilized to form the lithium battery string, the lithium battery string is a plurality of strings, and the number of each string of the lithium battery string can be selected through the selection terminal, so that the plurality of strings of lithium batteries connected in parallel form the lithium battery pack with variable floating number, and hardware support is provided for providing various power supply strategies.
It should be noted that, under the selection of the selection terminal, the number of the series-connected battery sections of the lithium battery string may be 1 section, 2 sections, 3 sections, 4 sections, N sections, and so on. Wherein N is a natural number.
On one hand, a lithium battery management module is connected with the lithium battery pack, and the lithium battery management module comprises the selection terminal; and the lithium battery management module acquires the dynamic parameters of the lithium battery pack and manages the lithium battery pack.
It should be noted that, when a selection terminal in the lithium battery management module is triggered, the selection of the number of lithium battery sections in the lithium battery pack can be realized, so that the selection of various charging strategies is met.
It is also noted that the dynamic parameters include the number of cells representing the change of the cell number and the electrical performance parameters representing the change of the electrical performance of the lithium battery pack. The electrical property parameter may be a voltage parameter, a current parameter, a temperature parameter, and the like.
It should be further noted that the lithium battery management module acquires dynamic parameters of the lithium battery pack and manages the lithium battery pack, so that the complex lithium battery structure with the floating battery section number can be optimally managed, and various charging strategies can be selected.
Various preferred examples with special technical effects are provided below, in particular as follows.
In a preferred example, the voltages of all lithium batteries in the lithium battery pack are acquired;
comparing the voltages of all the batteries with the overcharge detection voltage of the overcharge detection end, the overdischarge detection voltage of the overdischarge detection end and the voltage of the overcurrent detection end;
and when the voltage of all the batteries is between the overcharge detection voltage and the overdischarge detection voltage and is lower than the overcurrent detection voltage, controlling the lithium battery pack to normally supply power to the outside.
In a preferred example, the voltages of all lithium batteries in the lithium battery pack are acquired;
comparing the voltages of all the batteries with the overcharge detection voltage of the overcharge detection end;
and the voltage of any battery is higher than the overcharge detection voltage, and the duration time exceeds the overcharge protection delay time, so that the lithium battery pack is controlled to enter an overcharge protection state.
In a preferred example, the voltages of all lithium batteries in the lithium battery pack are acquired;
comparing the voltages of all the batteries with the overcharge detection voltage of the overcharge detection end;
if the voltage of any battery is higher than the overcharge detection voltage and the duration time of the voltage higher than the overcharge detection voltage does not exceed the overcharge protection delay time, judging the reduction condition of the battery voltage;
resetting the overcharge delay time if the battery voltage drops below the overcharge detection voltage and the duration of the undershoot exceeds the overcharge reset delay time; otherwise, the drop in battery voltage is identified as an extraneous disturbance for the masking process.
In a preferred example, the voltages of all lithium batteries in the lithium battery pack are acquired;
comparing all battery voltages with an overcharge relief voltage;
if all the battery voltages are lower than the overcharge relief voltage and the lower duration time exceeds the overcharge relief delay time, acquiring the voltage at the load end and comparing the voltage with the load detection voltage;
and if the voltage of the load terminal is greater than the load detection voltage, removing the overcharge protection state of the lithium battery pack.
In a preferred example, the voltages of all the batteries are acquired;
comparing the voltages of all the batteries with an over-discharge protection voltage;
and if the voltage of any battery is lower than the over-discharge protection voltage and the lower duration time exceeds the over-discharge protection delay time, controlling the lithium battery pack to enter an over-discharge protection state.
In a preferred example, the voltages of all the batteries and the voltage of the load end are obtained;
and when the voltage of the load end is between the dormancy detection voltage and the charging detection voltage, and the voltages of all the batteries are higher than the over-discharge release voltage and are maintained to exceed the over-discharge release time delay, releasing the over-discharge protection state of the lithium battery pack.
In a preferred example, when the lithium battery pack enters the over-discharge protection state and the entering time exceeds the dormancy delay time, the lithium battery pack is controlled to enter the dormancy state, so that the electric energy is saved.
In a preferred example, when the voltage at the load end is lower than the sleep detection voltage, the over-discharge protection state of the lithium battery pack is released.
In a preferred example, the voltage drop of the current detection resistor on the main circuit is detected through the charging connection terminal detection; and when the voltage drop of the current detection resistor is greater than the protection threshold value and the duration time exceeds the overcurrent protection delay time, controlling the lithium battery pack to enter an overcurrent protection state.
In a preferred example, when the voltage of the charging connection terminal is less than VDD/2 and the duration time exceeds the overcurrent recovery delay time, the overcurrent protection state of the lithium battery pack is released.
In a preferred example, the following equalization scheme may be employed to equalize the capacities of the respective cells in the battery pack.
When the voltage of one battery in all the batteries is higher than the balanced starting voltage and the voltages of other batteries are lower than the balanced starting voltage, the balance is started, and the external discharging loop is conducted;
when the voltage of the battery for starting the discharging loop is reduced to be lower than the balanced starting voltage, or the voltages of all the batteries are higher than the balanced starting voltage, the balancing is closed;
after the lithium battery pack enters overcharge protection, the external balanced discharge loop of the battery continues working, and when the voltage of all the batteries is lower than overcharge relief voltage, the lithium battery pack is controlled to normally supply power.
By the example, the battery pack can be cycled until all the battery voltages are above the balance starting voltage, and the technical effect of balancing the capacity of each battery in the battery pack is achieved.
In a preferred example, the voltages of all the batteries are acquired; when the voltage of any battery is lower than the low-voltage charge prohibition threshold value, the connection between the charge connection end and the lithium battery pack is turned off, so that low-voltage charge is avoided, and the charge safety is realized.
In a preferred example, the external temperature change is detected through an NTC resistor, and if the detected voltage reaches a comparison threshold and the charge-discharge over-temperature protection delay time is maintained, the charge-discharge over-temperature protection is triggered;
if the temperature drop amplitude exceeds the charge-discharge over-temperature release hysteresis temperature and the time reaches the charge-discharge over-temperature release delay, the over-temperature protection is released.
In a further embodiment, referring to fig. 2, a lithium battery management module comprises: chip U7, resistor R146, diode D17, resistor R147, capacitor C13, capacitor C14, resistor R148, resistor R149, resistor R150, resistor R151, resistor R152, resistor R153, transistor Q16, capacitor C115, resistor R154, resistor R155, transistor Q17, capacitor C116, resistor R156, resistor R158, transistor Q18, capacitor C117, resistor R160, resistor R162, transistor Q19, capacitor C118, capacitor C119, resistor R164, resistor R165, resistor NTC, interface J9, resistor R168, resistor R169, capacitor C120, capacitor C121, capacitor C122, resistor R163, resistor R166, MOS transistor Q20, MOS transistor Q21, MOS transistor Q22, MOS transistor Q23, resistor R167, resistor R161, resistor R159, and resistor R157.
A first end of the resistor R146 is connected with an anode of the diode D17 and a first end of the capacitor C13, and the resistor R148 and the resistor R151 are connected in parallel and connected with a second end of the resistor R146 together to a VBAT end; the resistor R148 and the resistor R151 are connected in parallel and are connected with the second end of the resistor R146 together to be connected with the VBAT end;
a first end of the resistor R147 is connected with a cathode of the diode D17, a second end of the resistor R147, a first end of the capacitor C14, a first end of the resistor R149 and the chip U7 are connected; the second end of the resistor R149 is connected to the first end of the resistor R150 and the chip U7, and the second end of the resistor R150 is grounded; the second terminal of the capacitor C14, the second terminal of the capacitor C13 and the ground terminal are connected.
The first end of the resistor R152 and the first end of the resistor R153 are connected, the second end of the resistor R152, the first end of the capacitor C115 and a pin VC4 of a chip U7 are connected, the second end of the capacitor C115 is grounded, the second end of the resistor R153 is connected with the first end of the triode Q16, and the second end of the triode Q16 is connected with a pin VB4 of a chip U7.
The first end of the resistor R154, the first end of the resistor R155 and the third end of the triode Q16 are connected, the second end of the resistor R154, the first end of the capacitor C116 and the pin VC3 of the chip U7 are connected, the second end of the capacitor C116 is grounded, the second end of the resistor R155 is connected with the first end of the triode Q17, and the second end of the triode Q17 is connected with the pin VB3 of the chip U7.
The first end of the resistor R156, the first end of the resistor R158 and the third end of the triode Q17 are connected, the second end of the resistor R156, the first end of the capacitor C117 and the pin VC2 of the chip U7 are connected, the second end of the capacitor C117 is grounded, the second end of the resistor R158 is connected with the first end of the triode Q17, and the second end of the triode Q17 is connected with the pin VB2 of the chip U7.
The first end of resistance R160, the first end of resistance R162, the third end of triode Q18 is connected, the second end of resistance R160, the first end of electric capacity C1178 and the pin VC1 of chip U7 are connected, the second end ground of electric capacity C118, the second end of resistance R162 is connected with the first end of triode Q19, the second end of triode Q19 is connected with pin VB1 of chip U7, the third end and the ground connection of triode Q19.
The first terminal of the capacitor C119 is connected to the pin VSS and the ground terminal of the chip U7, and the first terminal of the capacitor C119 is connected to the pin REG of the chip U7.
A first end of the resistor R164 and a first end of the resistor R165 are respectively connected with a pin RCOT and a pin RDOT of the chip U7, a second end of the resistor R164 and a second end of the resistor R165 are connected with a first end of the resistor NTC, and a second end of the resistor NTC is connected with a first end of the resistor R168, a first end of the resistor R169, a first end of the capacitor C120, a first end of the capacitor C121 and a first end of the capacitor C122 to be commonly connected with the ground; the second end of the resistor R168 and the second end of the resistor R169 are commonly connected with the first end of the resistor R163, the first end of the resistor R166, the MOS transistor Q20 and the MOS transistor Q22; the second end of the capacitor C120, the second end of the capacitor C121 and the second end of the capacitor C122 are respectively connected with the chip U7, the second end of the capacitor C122 is connected with the second end of the resistor R163, the second end of the resistor R166 and the MOS transistor Q20, the MOS transistor Q20 is connected with the MOS transistor Q21, the MOS transistor Q22 is connected with the MOS transistor Q23, the MOS transistor Q21 is connected with the chip U7 through the resistor R161, and the MOS transistor Q21 is connected with the MOS transistor Q23, the first end of the resistor R167 and the first end of the resistor R157 to the ground; the second end of the resistor R167 is commonly connected with the MOS transistor Q23 and the first end of the resistor R159, the second end of the resistor R159 is connected with the chip U7, and the second end of the resistor R157 is connected with the chip U7.
It should be noted that the chip U7 may be a CW1046 chip.
It should be further noted that the MOS transistor Q20, the MOS transistor Q21, the MOS transistor Q22, and the MOS transistor Q23 are connected to the chip U7, and are turned on or turned off by receiving a control signal of the chip U7, so that the lithium battery pack is managed as a whole.
It should be further noted that the chip U7 may manage a single battery through corresponding unit circuits of the peripheral VC1, VC2, VC3, and the like.
Example two
Referring to fig. 3, on the basis of the above embodiments, the present embodiment provides a power supply system for supplying power to a lithium battery pack, including a DC-DC module; and the DC-DC module is connected with the lithium battery management module and provides a direct current power supply to the outside.
In a modified embodiment, referring to fig. 3, the power supply system based on lithium battery pack power supply further includes a main control module; the main control module is connected with the DC-DC module.
It should be noted that the main control module monitors the functional state of the DC-DC module, and controls the warning module to perform an abnormal alarm when the functional state of the DC-DC module is abnormal.
It should be further noted that the main control module may control the DC-DC module to be turned on or off.
It should be further noted that the DC-DC module can enable the power supply system to provide DC power, so as to adapt to different DC charging scenarios.
EXAMPLE III
Referring to fig. 4, on the basis of the above embodiments, the present embodiment provides a power supply system for supplying power to a lithium battery pack, including a DC-AC module; and the DC-AC module is connected with the lithium battery management module and provides an alternating current power supply for the outside.
It should be noted that the DC-AC module can enable the power supply system to provide AC power supply, and is suitable for different AC charging scenarios.
In an alternative embodiment, referring to fig. 5, a power supply system based on lithium battery pack power supply includes a DC-AC module and a main control module; the DC-AC module is connected with the main control module, the DC-AC module is connected with the lithium battery management module, and the DC-AC module provides an alternating current power supply to the outside.
It should be noted that the main control module monitors the functional state of the DC-AC module, and controls the warning module to perform an abnormal alarm when the functional state of the DC-DC module is abnormal.
It should be further noted that the main control module may control the DC-AC module to be turned on or off.
In an alternative embodiment, referring to fig. 6, the power supply system based on lithium battery pack power supply comprises a DC-AC module, a main control module and a soft start module; the DC-AC module is connected with the main control module through the soft start module, the main control module is connected with the lithium battery management module, and the DC-AC module provides an alternating current power supply for the outside.
It should be noted that, compared with the technical scheme that the DC-AC module is directly connected to the main control module, the soft start module is arranged between the DC-AC module and the main control module, so that the main control module and the DC-AC module can be safely started, and surge breakdown or damage is avoided.
Preferably, referring to fig. 7, the soft start module includes: the circuit comprises a capacitor C26, a resistor R44, a resistor R45, a resistor R46, a resistor R48, a capacitor C25, a chip U5, a capacitor EC4, a resistor R50, a capacitor C29, a resistor R49, a capacitor EC3, a capacitor C24 and a capacitor C27.
The first end of the capacitor C26 is connected to the first end of the resistor R44, the first end of the resistor R46 and the DCVCC end, the second end of the capacitor C26 is grounded, the second end of the resistor R44 is connected to the first end of the resistor R45, the first end of the capacitor C25 and the chip U5, the second end of the resistor R45 and the second end of the capacitor C25 are connected to ground, and the second end of the resistor R46 is grounded through the resistor R48 and connected to the chip U5.
The chip U5 is connected with the positive electrode of the capacitor EC4, the negative electrode of the capacitor EC4 is connected with the first end of the resistor R50 and the chip U5, the second end of the resistor R50 is connected with the first end of the capacitor C29 and the first end of the resistor R49 in common, and the second end of the capacitor C29 and the second end of the resistor R49 are connected with the chip U5.
The positive electrode of the capacitor EC3, the first end of the capacitor C24 and the first end of the capacitor C27 are connected together and then connected with the chip U5, the negative electrode of the capacitor EC3 and the second end of the capacitor C24 are connected together with the ground and a VCC end, and the second end of the capacitor C27 is connected together with the ground.
It should be noted that the soft start module is matched with a peripheral circuit of the chip U5 together to realize that direct current is converted into alternating current to supply power to the outside, so that the electric equipment and the main control module are prevented from being damaged due to instantaneous high voltage during starting, soft start is realized, and the circuit cost is saved.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims (10)

1. A power supply system based on lithium battery pack charging is characterized by comprising:
the lithium battery pack comprises a plurality of lithium batteries, the lithium batteries form a lithium battery string with 1-N battery sections under the selection of a selection terminal, the lithium battery string is a plurality of strings, and the plurality of strings of lithium batteries are connected in series and parallel to form the lithium battery pack; n is a natural number;
the lithium battery management module is connected with the lithium battery pack and comprises the selection terminal; and the lithium battery management module acquires the dynamic parameters of the lithium battery pack and manages the lithium battery pack.
2. The lithium battery pack charging-based power supply system according to claim 1, wherein the dynamic parameters include a number of cells that are indicative of a change in cell number and electrical performance parameters that are indicative of a change in electrical performance of the lithium battery pack.
3. The lithium battery pack charging-based power supply system according to claim 1, further comprising a DC-DC module; and the DC-DC module is connected with the lithium battery management module and provides a direct current power supply to the outside.
4. The lithium battery pack charging-based power supply system according to claim 3, further comprising a master control module; the main control module is connected with the DC-DC module.
5. The lithium battery pack charging-based power supply system according to claim 4, wherein the main control module monitors the functional state of the DC-DC module, and controls an alarm module to give an abnormal alarm when the functional state of the DC-DC module is abnormal.
6. The lithium battery pack charging-based power supply system according to claim 4, wherein the main control module controls the DC-DC module to be turned on or off.
7. The lithium battery pack charging-based power supply system according to claim 1, further comprising a DC-AC module; and the DC-AC module is connected with the lithium battery management module and provides an alternating current power supply for the outside.
8. The lithium battery pack charging-based power supply system according to claim 1, further comprising a DC-AC module and a main control module; the DC-AC module is connected with the main control module, the DC-AC module is connected with the lithium battery management module, and the DC-AC module provides an alternating current power supply to the outside.
9. The lithium battery pack charging-based power supply system according to claim 1, further comprising a DC-AC module, a main control module, and a soft start module; the DC-AC module is connected with the main control module through the soft start module, the main control module is connected with the lithium battery management module, and the DC-AC module provides an alternating current power supply to the outside.
10. The lithium battery pack charging-based power supply system according to claim 9, wherein the main control module controls the DC-AC module to be turned on or off.
CN202111449048.7A 2021-11-30 2021-11-30 Power supply system based on lithium battery pack charging Pending CN114448021A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202111449048.7A CN114448021A (en) 2021-11-30 2021-11-30 Power supply system based on lithium battery pack charging

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111449048.7A CN114448021A (en) 2021-11-30 2021-11-30 Power supply system based on lithium battery pack charging

Publications (1)

Publication Number Publication Date
CN114448021A true CN114448021A (en) 2022-05-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202111449048.7A Pending CN114448021A (en) 2021-11-30 2021-11-30 Power supply system based on lithium battery pack charging

Country Status (1)

Country Link
CN (1) CN114448021A (en)

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