CN205829227U - A kind of lithium rechargeable batteries change-over circuit - Google Patents
A kind of lithium rechargeable batteries change-over circuit Download PDFInfo
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- CN205829227U CN205829227U CN201620719004.XU CN201620719004U CN205829227U CN 205829227 U CN205829227 U CN 205829227U CN 201620719004 U CN201620719004 U CN 201620719004U CN 205829227 U CN205829227 U CN 205829227U
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- battery
- lithium
- voltage
- rechargeable batteries
- voltage sample
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Abstract
The utility model discloses a kind of lithium rechargeable batteries change-over circuit, multiple lithium batteries are connected, and the 1st cathode of lithium battery is connected to voltage protection metal-oxide-semiconductor, and voltage protection metal-oxide-semiconductor is connected to load negative pole；1st lithium battery both positive and negative polarity is connected to the 1st balance module input, 1st balance module outfan is connected to battery management chip, 1st lithium battery anode is connected to the input of the 1st voltage sample module, and the outfan of the 1st voltage sample module is connected to battery management chip；The corresponding voltage sample module of further battery group is identical with the 1st with the connected mode of balance module；Battery management chip is connected to efficient DC DC modular converter, and the efficient DC DC modular converter other end also passes sequentially through inductance L, switching transistor is connected to load positive pole etc..After using this utility model change-over circuit, it is not necessary to change and replace charging and the management circuit of original Ni-MH battery group, it is achieved nickel-hydrogen chargeable cell group lithium rechargeable batteries directly substitutes.
Description
Technical field
This utility model relates to lithium rechargeable batteries field, particularly to a kind of lithium rechargeable batteries change-over circuit.
Background technology
Rechargeable battery has been widely used in each class of electronic devices.For reducing product cost, substantial amounts of electronics is had to set at present
Standby continuing to uses technology maturation and cheap Ni-MH battery group.And although lithium rechargeable batteries cost is of a relatively high, but
Possess battery memory-less effect, the higher advantage of energy density, have begun to quickly replace the market of nickel-hydrogen chargeable cell.
The operating characteristic difference of nickel-hydrogen chargeable cell and lithium rechargeable batteries is very big, and the safety of lithium rechargeable batteries and
Very poor to the toleration of overcharge and overdischarge, lithium rechargeable batteries can cause blast on fire when overcharging serious, it is therefore desirable to specially
The protection circuit of door and charge management circuit.But Ni-MH battery group directly cannot substitute with lithium rechargeable batteries.
The most still there is a large amount of electronic product to use the Ni-MH battery group of low cost, cause weight to lay particular stress on and during continuous firing
Between substantially be inferior to use lithium rechargeable batteries like product.
When rechargeable battery uses in the electronic device, generally want design packet fulgurite reason circuit and two kinds of merits of battery protecting circuit
Energy.Ni-MH battery needs constant current constant voltage or-△ V charging technique, and lithium rechargeable batteries uses constant-current constant-voltage charging technology.Ni-mh
Battery is relatively good to the toleration of overcharge and overdischarge, does not use protection circuit for reduction cost during application.Lithium rechargeable batteries
Overdischarge can cause battery permanent failure, overcharges and battery can be caused to scrap even explode, then must use protection circuit.Therefore,
Nickel-hydrogen chargeable cell group and lithium rechargeable batteries (group), even if supply voltage is close to also cannot directly replace, there is no ni-mh electricity on the market
Product that pond group is directly replaced with lithium rechargeable batteries (group) or change-over circuit.
Utility model content
Technical problem to be solved in the utility model is to propose a kind of lithium rechargeable batteries change-over circuit, and lithium rechargeable batteries is even
After connecing this circuit, i.e. can be applicable to use in the equipment of nickel-hydrogen chargeable cell group or device, meet lithium rechargeable batteries safety and
Operating characteristic requirement, it is not necessary to change and replace charging and the management circuit of original Ni-MH battery group, it is achieved nickel-hydrogen chargeable cell
Group lithium rechargeable batteries (group) substitutes.
For solving above-mentioned technical problem, the technical solution adopted in the utility model is:
A kind of lithium rechargeable batteries change-over circuit, the series connection of multiple lithium batteries, the 1st cathode of lithium battery is connected to voltage protection
Metal-oxide-semiconductor, described voltage protection metal-oxide-semiconductor is connected to load negative pole；
1st lithium battery both positive and negative polarity is connected to the 1st balance module input, and the 1st balance module outfan is connected to
Battery management chip, described 1st lithium battery anode is connected to the input of the 1st voltage sample module, the 1st voltage sample
The outfan of module is connected to battery management chip；
Each lithium battery both positive and negative polarity is all connected to the balance module input that this lithium battery is corresponding later, and corresponding is equal
Weighing apparatus module outfan is connected to battery management chip, and this lithium battery anode is connected to the input of the voltage sample module of its correspondence
End, the outfan of corresponding voltage sample module is connected to battery management chip；
Described battery management chip is connected to efficient DC-DC modular converter, and described efficient DC-DC modular converter one terminates
Ground, the other end is connected to diode D1 positive pole, and described diode D1 negative pole is connected to load positive pole, and described efficient DC-DC changes
The module other end also passes sequentially through inductance L, switching transistor is connected to load positive pole, is connected between switching transistor with inductance L
To diode D2 negative pole, diode D2 plus earth.
According to such scheme, the structure of each voltage sample module is the same；1st voltage sample modular structure
For: the 1st lithium battery anode, resistance R1, resistance R2 one end are sequentially connected in series, resistance R2 other end ground connection, resistance R1 and resistance R2
Junction is the 1st voltage sample module outfan.
According to such scheme, the structure of each balance module is the same；1st balance module structure is: resistance R3
One end is connected to the 1st lithium battery anode, and the other end is connected to the 1st metal-oxide-semiconductor drain electrode, and the 1st metal-oxide-semiconductor source electrode is connected to the 1st
Individual cathode of lithium battery, the 1st metal-oxide-semiconductor grid is connected to battery management chip.
Compared with prior art, the beneficial effects of the utility model are: after have employed this utility model change-over circuit, lithium fills
Electricity battery (group) can directly replace nickel-hydrogen chargeable cell group, and this change-over circuit contains the perfect protection of lithium rechargeable batteries with equal
Weighing apparatus function, is therefore significantly larger than common nickel-hydrogen chargeable cell group service life.Meanwhile, this change-over circuit gives full play to lithium charging
The advantage that battery energy density is high, reduces the weight of set of cells, it is provided that the longer working time.
Accompanying drawing explanation
Fig. 1 is this utility model lithium rechargeable batteries change-over circuit principle schematic.
Fig. 2 is voltage sample module principle figure in this utility model.
Fig. 3 is balance module schematic diagram in this utility model.
Fig. 4 is the theory diagram of adoptable a kind of lithium rechargeable batteries managing chip in this utility model.
Detailed description of the invention
With detailed description of the invention, this utility model is described in further detail below in conjunction with the accompanying drawings.
This utility model change-over circuit takes into full account lithium rechargeable batteries and the operating characteristic of nickel-hydrogen chargeable cell and parameter, adopts
Realize optimal control with battery management chip, under conditions of ensureing lithium rechargeable batteries (group) normal operating conditions, allow lithium charge
Battery (group) embodies the operating characteristic of nickel-hydrogen chargeable cell group to outside power circuit and charging circuit, thus realizes ni-mh
Rechargeable battery set directly can substitute with lithium rechargeable batteries, and original nickel-hydrogen battery charging circuit and power circuit need not be appointed
What is changed.
As it is shown in figure 1, this utility model structure is: multiple lithium batteries are connected, the 1st cathode of lithium battery is connected to voltage and protects
Protecting metal-oxide-semiconductor, described voltage protection metal-oxide-semiconductor is connected to load negative pole；1st lithium battery both positive and negative polarity is connected to the 1st balance module
Input, the 1st balance module outfan is connected to battery management chip, and described 1st lithium battery anode is connected to the 1st electricity
The input of pressure sampling module, the outfan of the 1st voltage sample module is connected to battery management chip；Each lithium later
Battery plus-negative plate is all connected to the balance module input that this lithium battery is corresponding, and corresponding balance module outfan is connected to electricity
Pond managing chip, this lithium battery anode is connected to the input of the voltage sample module of its correspondence, corresponding voltage sample mould
The outfan of block is connected to battery management chip；Described battery management chip is connected to efficient DC-DC modular converter, described efficiently
DC-DC modular converter one end ground connection, the other end is connected to diode D1 positive pole, and described diode D1 negative pole is connected to just load
Pole, the described efficient DC-DC modular converter other end also passes sequentially through inductance L, switching transistor is connected to load positive pole, switch crystalline substance
Diode D2 negative pole, diode D2 plus earth it is connected between body pipe and inductance L.
As in figure 2 it is shown, voltage sample module uses precision resister bleeder circuit, the structure of each voltage sample module
The same；1st voltage sample modular structure is: the 1st lithium battery anode, resistance R1, resistance R2 one end are sequentially connected in series, electricity
Resistance R2 other end ground connection, resistance R1 and resistance R2 junction are the 1st voltage sample module outfan.
As it is shown on figure 3, balance module uses switch metal-oxide-semiconductor series shunt resistance to realize, the knot of each balance module
Structure is the same；1st balance module structure is: resistance R3 one end is connected to the 1st lithium battery anode, and the other end is connected to
1 metal-oxide-semiconductor drain electrode, the 1st metal-oxide-semiconductor source electrode is connected to the 1st cathode of lithium battery, and the 1st metal-oxide-semiconductor grid is connected to battery management
Chip.
The fully charged rear voltage of nickel-hydrogen chargeable cell is close to 1.4v, and lithium rechargeable batteries fully charged voltage 4.20v, i.e. 3 joints are connected
Nickel-hydrogen chargeable cell replace with 1 lithium rechargeable batteries.Meanwhile, battery powered circuit is used to possess certain running voltage
Scope, to adapt to the characteristic that discharging rechargeable battery voltage is gradually lowered.Therefore, lithium rechargeable batteries is used to substitute nickel hydride charging electricity
Pond group is feasible for discharge voltage parameter.
In Fig. 1, n lithium rechargeable batteries set of cells in series, substitute the set of cells that 3n nickel-hydrogen chargeable cell is constituted, P+
It is the positive pole that externally connects of lithium rechargeable batteries group change-over circuit and negative pole respectively with P-.Because overcharge is put by lithium rechargeable batteries with crossing
Electricity requires to be strictly necessary to very much use protection circuit, and this utility model uses battery management chip to drive the voltage sample in Fig. 2
Module, persistently carries out A/D sampling to the voltage of each battery unit, as the logical foundations of the state control to set of cells, real
Existing following function:
1, function is overcharged: when certain element cell fills with, and when voltage exceedes the overvoltage protection value of setting, cell tube
Reason chip controls voltage protection metal-oxide-semiconductor cut-off turns off, then external charge current is cut off, it is achieved additives for overcharge protection.When battery electricity
After pressure returns to normal range, protection metal-oxide-semiconductor conducting, set of cells works on.
2, Cross prevention: when certain cell voltage is less than the low-voltage variation value set, battery management chip controls
The cut-off of voltage protection metal-oxide-semiconductor turns off, then stop external discharge, it is achieved Cross prevention.When cell voltage returns to normal range
After, metal-oxide-semiconductor turns on, and set of cells works on.
3, charge balancing: protection circuit is that each battery unit provides independent charge balancing module.When certain battery
Voltage when reaching to be full of voltage, and the charging current of set of cells is also when lasting, and the metal-oxide-semiconductor of balance module shown in Fig. 3 is led
Logical, the charging current of this battery is shunted by resistance R3, it is provided that extracurrent path is continued by the battery of other underfill
Continuous charging, thus the situation avoiding Individual cells to overcharge occurs, whole battery cell also can be allowed all to be full of, unit
The discordance of battery is equalized and is compensated.When the metal-oxide-semiconductor of balance module ends, shunt resistance is inoperative.
The built-in efficient DC-DC modular converter of circuit, is converted to the running voltage of battery management chip by battery voltage.Electricity
Pond managing chip is operated under low-power consumption mode, the lowest to the power consumption of lithium rechargeable batteries (group).Voltage protection metal-oxide-semiconductor selects
By the field effect transistor of low internal resistance, its pressure drop and power consumption are the lowest.D1 is that Schottky diode possesses one-way conduction characteristic, it is achieved electricity
Pond group is the most externally discharged.
Switching transistor, diode D2 have become typical adjusting and voltage-reduction switch power circuit with inductance L, at battery management core
Under the accurately control of sheet, outside Ni-MH battery group charging voltage can be reduced to be suitable for the charged electrical of lithium rechargeable batteries (group)
Pressure, to meet the charge characteristic of lithium rechargeable batteries constant current constant voltage.When lithium rechargeable batteries group charging complete, switching transistor, two
Pole pipe D2 and inductance L has become adjusting and voltage-reduction switch power circuit under the accurately control of battery management chip, can simulate ni-mh electricity
The logic state during charging complete of pond, allows external charging circuit stop charging.
In this utility model, the adoptable each pin function of lithium rechargeable batteries managing chip is as shown in table 1.
Table 1 lithium rechargeable batteries managing chip pin function describes
Battery management chip in Fig. 4 has been internally integrated several functions module, including:
1, " reference voltage " module, vdd voltage is transformed to high-precision reference voltage by this module, as battery management core
The basis reference of sheet internal measurement unit cell voltage.
2, COMP is voltage comparator module, each unit lithium rechargeable batteries correspondence 1 group totally 3 voltage comparators, respectively
It is under-voltage comparator, is full of comparator, overvoltage comparator.When cell voltage is in different range, three voltage comparators are respectively
The voltage status logical signal of output unit lithium rechargeable batteries.
3, " battery voltage measurement, under-voltage, overvoltage, equilibrium, PWM control function " module is the important merit of battery management chip
Energy module, by periodically gathering the voltage status logical signal of each unit lithium rechargeable batteries, patrols according to battery set management
Volume, drive corresponding BLx and ON/OFF pin, it is achieved the merits such as the under-voltage protection of lithium rechargeable batteries group, overvoltage protection, charge balancing
Energy.PWM controls function and the series connection total voltage of lithium rechargeable batteries group is compared with outside nickel hydride charging circuit output voltage,
And the dutycycle of " PWM agitator " module is gone to control according to voltage differences.
4, " PWM agitator " module produces the square wave of variable duty ratio under controlled case, is driven outside by PWM pin
Adjusting and voltage-reduction switch power circuit breaker in middle transistor turns and cut-off state.Owing to introducing negative feedback mechanism, height can be realized
The constant current of load lithium rechargeable batteries characteristic of precision, constant-voltage charge control, and i.e. achieve original nickel-hydrogen battery charging circuit pair
The safe and reliable Charge Management of lithium rechargeable batteries.
Claims (3)
1. a lithium rechargeable batteries change-over circuit, it is characterised in that multiple lithium batteries are connected, and the 1st cathode of lithium battery is connected to
Voltage protection metal-oxide-semiconductor, described voltage protection metal-oxide-semiconductor is connected to load negative pole；
1st lithium battery both positive and negative polarity is connected to the 1st balance module input, and the 1st balance module outfan is connected to battery
Managing chip, described 1st lithium battery anode is connected to the input of the 1st voltage sample module, the 1st voltage sample module
Outfan be connected to battery management chip；
Each lithium battery both positive and negative polarity is all connected to the balance module input that this lithium battery is corresponding, corresponding equilibrium model later
Block outfan is connected to battery management chip, and this lithium battery anode is connected to the input of the voltage sample module of its correspondence,
The outfan of corresponding voltage sample module is connected to battery management chip；
Described battery management chip is connected to efficient DC-DC modular converter, described efficient DC-DC modular converter one end ground connection, separately
One end is connected to diode D1 positive pole, and described diode D1 negative pole is connected to load positive pole, and described efficient DC-DC modular converter is another
One end also passes sequentially through inductance L, switching transistor is connected to load positive pole, is connected to two poles between switching transistor and inductance L
Pipe D2 negative pole, diode D2 plus earth.
2. a kind of lithium rechargeable batteries change-over circuit as claimed in claim 1, it is characterised in that each voltage sample module
Structure is the same；1st voltage sample modular structure is: the 1st lithium battery anode, resistance R1, resistance R2 one end are gone here and there successively
Connection, resistance R2 other end ground connection, resistance R1 and resistance R2 junction are the 1st voltage sample module outfan.
3. a kind of lithium rechargeable batteries change-over circuit as claimed in claim 1 or 2, it is characterised in that each balance module
Structure is the same；1st balance module structure is: resistance R3 one end is connected to the 1st lithium battery anode, and the other end is connected to
1st metal-oxide-semiconductor drain electrode, the 1st metal-oxide-semiconductor source electrode is connected to the 1st cathode of lithium battery, and the 1st metal-oxide-semiconductor grid is connected to cell tube
Reason chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620719004.XU CN205829227U (en) | 2016-07-08 | 2016-07-08 | A kind of lithium rechargeable batteries change-over circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620719004.XU CN205829227U (en) | 2016-07-08 | 2016-07-08 | A kind of lithium rechargeable batteries change-over circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205829227U true CN205829227U (en) | 2016-12-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620719004.XU Expired - Fee Related CN205829227U (en) | 2016-07-08 | 2016-07-08 | A kind of lithium rechargeable batteries change-over circuit |
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| CN (1) | CN205829227U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107196377A (en) * | 2017-07-12 | 2017-09-22 | 长沙方星腾电子科技有限公司 | A kind of multisection lithium battery protects chip circuit |
| CN107302215A (en) * | 2017-07-12 | 2017-10-27 | 长沙方星腾电子科技有限公司 | A kind of multisection lithium battery protects chip circuit |
| CN111262328A (en) * | 2018-11-30 | 2020-06-09 | 厦门雅迅网络股份有限公司 | Vehicle-mounted terminal standby battery management system |
| CN114094647A (en) * | 2020-12-29 | 2022-02-25 | 荣耀终端有限公司 | Battery cell connection state switching method, power supply system and electronic equipment |
-
2016
- 2016-07-08 CN CN201620719004.XU patent/CN205829227U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107196377A (en) * | 2017-07-12 | 2017-09-22 | 长沙方星腾电子科技有限公司 | A kind of multisection lithium battery protects chip circuit |
| CN107302215A (en) * | 2017-07-12 | 2017-10-27 | 长沙方星腾电子科技有限公司 | A kind of multisection lithium battery protects chip circuit |
| CN111262328A (en) * | 2018-11-30 | 2020-06-09 | 厦门雅迅网络股份有限公司 | Vehicle-mounted terminal standby battery management system |
| CN114094647A (en) * | 2020-12-29 | 2022-02-25 | 荣耀终端有限公司 | Battery cell connection state switching method, power supply system and electronic equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161221 Termination date: 20170708 |