CN113162175A - Protection circuit for preventing multiple lithium primary batteries from over-discharging in series connection - Google Patents
Protection circuit for preventing multiple lithium primary batteries from over-discharging in series connection Download PDFInfo
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- CN113162175A CN113162175A CN202110441076.8A CN202110441076A CN113162175A CN 113162175 A CN113162175 A CN 113162175A CN 202110441076 A CN202110441076 A CN 202110441076A CN 113162175 A CN113162175 A CN 113162175A
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- resistor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a protection circuit for preventing over-discharge of a plurality of lithium primary batteries in series connection, which comprises a lithium battery, a fuse, a voltage detection chip, a field effect transistor, a capacitor and a resistor, wherein the lithium battery comprises a first lithium battery and a second lithium battery, the voltage detection chip comprises a first voltage detection chip and a second voltage detection chip, the field effect transistor comprises a first field effect transistor, a second field effect transistor, a third field effect transistor and a fourth field effect transistor, the capacitor comprises a third capacitor, a third capacitor and a third capacitor, and the resistor comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor and an eighth resistor. The multi-lithium primary battery series circuit has excellent over-discharge protection effectiveness, can solve the problems of over-charge, over-discharge, short circuit and the like in the use process of the lithium primary battery, and can be widely popularized and applied.
Description
[ technical field ] A method for producing a semiconductor device
The invention belongs to the technical field of Internet of things and lithium primary battery protection, and relates to a protection circuit for preventing multiple lithium primary batteries from being over-discharged in series connection.
[ background of the invention ]
The lithium primary battery discharges the stored electricity, and after the voltage reaches a certain value, the lithium primary battery continues to discharge to cause over-discharge, and the cut-off voltage of the lithium primary battery is usually 2.0V. Over-discharge of the battery can have catastrophic consequences for the battery, particularly over-discharge of large currents, or repeated over-discharge. In the case of severe over-discharge, there is a risk of slurry explosion or even explosion.
The prior art batteries have the following problems:
1) the lithium primary battery cannot be overdischarged, and the overdischarged battery has irreversible damage and safety risk and should be prevented from generating an overdischarge phenomenon;
2) the battery series connection group can only protect one group from over-discharging, and can not protect the over-discharging of any single battery during series connection;
3) when batteries are combined in series, the same performance is ensured by combining multiple batteries in the same batch, but the batteries may have differences after long-term operation, so that a certain electricity saving amount is large, a certain electricity saving amount is small, and if the batteries are still used, a certain battery with small electricity saving amount may have over-discharge.
The research and the solution of the technical problems become a new development trend.
[ summary of the invention ]
The invention provides an over-discharge prevention protection circuit for serially connecting a plurality of lithium primary batteries, which is used for solving the problems of over-charge, over-discharge, short circuit and the like in the use process of the lithium primary batteries.
In order to solve the technical problems, the invention adopts the following technical scheme.
The protection circuit for preventing the over-discharge of the multi-section lithium primary battery in series connection is characterized by comprising a lithium battery, a fuse F1, a voltage detection chip, a field effect transistor, a capacitor and a resistor, wherein the lithium battery comprises a first lithium battery and a second lithium battery, the voltage detection chip comprises a first voltage detection chip U1 and a second voltage detection chip U2, the field effect transistor comprises a first field effect transistor Q1, a second field effect transistor Q2, a third field effect transistor Q3 and a fourth field effect transistor Q4, the capacitor comprises a third capacitor C1, a third capacitor C2 and a third capacitor C3, and the resistor comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and an eighth resistor R8;
one end of the first lithium battery is connected with a pin J1, and the other end of the first lithium battery is connected with a pin J3; one end of the second lithium battery is connected with a pin J3, and the other end of the second lithium battery is connected with a pin J4;
the fuse F1 is connected with one end of a first lithium battery in a termination J1, and the other end of the fuse F1 is connected with an eighth resistor R8, a second resistor R2, a third resistor R3, a first capacitor C1, a first resistor R1 and the drain electrode of a first field effect transistor Q1;
the first pin of the first voltage detection chip U1 is connected with a third resistor R3, a fourth resistor R4 and the drain electrode of a third field effect transistor Q3; the second pin of the first voltage detection chip U1 is connected with an eighth resistor R8; the third pin of the first voltage detection chip U1 is connected with J3 and a fifth resistor R5;
the first pin of the second voltage detection chip U2 is connected with the second resistor R2 and the gate of the third field effect transistor Q3; a second pin of the second voltage detection chip U2 is connected with a fifth resistor R5, a source electrode of a third field effect transistor Q3, a second capacitor C2, a source electrode of a fourth field effect transistor Q4 and a source electrode of a second field effect transistor Q2; the third pin of the second voltage detection chip U2 is connected with J4, a sixth resistor R6 and a seventh resistor R7;
the gate of the first field effect transistor Q1 is connected with a first resistor R1, the drain of a second field effect transistor Q2, the gate of a fourth field effect transistor Q4 and a second capacitor C2; the source of the first field effect transistor Q1 is connected to the third capacitor C3 and the output terminal VBAT;
the gate of the second field effect transistor Q2 is connected with the drain of a fourth field effect transistor Q4, a first capacitor C1 and a fourth resistor R4;
one end of the third capacitor C3 is connected to the sixth resistor R6, the seventh resistor R7 and the output terminal GND.
Preferably, the lithium disposable battery is a lithium thionyl chloride battery.
Preferably, the lithium thionyl chloride cell comprises one of ER14250 lithium thionyl chloride cell and ER18505 lithium thionyl chloride cell.
Preferably, the voltage of the first lithium battery and the voltage of the second lithium battery are both 3.6V.
Preferably, the fuse F1 is a current 2.5A resettable fuse.
Preferably, the field effect transistor includes a Pmos field effect transistor and an Nmos field effect transistor.
Preferably, the Pmos field effect transistors comprise a first Pmos field effect transistor Q1 and a third Pmos field effect transistor Q3, and the Nmos field effect transistors comprise a second Nmos field effect transistor Q2 and a fourth Nmos field effect transistor Q4.
Preferably, the third capacitor C3 is a super capacitor.
Preferably, the super capacitor is 1F.
Through this technical scheme, can realize following effect:
(1) according to the invention, the first capacitor C1 and the fourth resistor R4 are arranged, the fourth Nmos field effect transistor Q4 and the second capacitor C2 can prevent output change caused by oscillation change of a critical point and play a role of change buffering, the fuse F1, the sixth resistor R6 and the seventh resistor R7 can play a role of short-circuit protection, and the third capacitor C3 can provide a large-current power supply requirement and prevent switching jitter of a lithium primary battery at the critical voltage point.
(2) The multi-lithium primary battery series circuit has excellent over-discharge protection effectiveness, can solve the problems of over-charge, over-discharge, short circuit and the like in the use process of the lithium primary battery, and can be widely popularized and applied.
[ description of the drawings ]
Fig. 1 is a schematic diagram of a protection circuit for preventing over-discharge of multiple lithium primary batteries connected in series according to the present invention.
[ detailed description ] embodiments
The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. It should be emphasized that the following description is merely exemplary in nature and is not intended to limit the scope of the invention or its application.
Example 1
As shown in the figure 1, the protection circuit for preventing the over-discharge of the multi-lithium primary battery in series connection comprises a lithium battery, a fuse F1, a voltage detection chip, a field effect transistor, a capacitor and a resistor, wherein the lithium battery comprises a first lithium battery and a second lithium battery, the voltage detection chip comprises a first voltage detection chip U1 and a second voltage detection chip U2, the field effect transistor comprises a Pmos field effect transistor and a Nmos field effect transistor, the Pmos field effect transistor comprises a first Pmos field effect transistor Q1 and a third Pmos field effect transistor Q3, the Nmos field effect transistor comprises a second Nmos field effect transistor Q2 and a fourth Nmos field effect transistor Q4, the capacitor comprises a third capacitor C1, a third capacitor C2 and a third capacitor C3, and the resistor comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, A sixth resistor R6, a seventh resistor R7, and an eighth resistor R8.
One end of the first lithium battery is connected with a pin J1, and the other end of the first lithium battery is connected with a pin J3; one end of the second lithium battery is connected with a pin J3, the other end of the second lithium battery is connected with a pin J4, the lithium disposable battery is a lithium thionyl chloride battery, and the lithium thionyl chloride battery comprises an ER14250 lithium thionyl chloride battery.
The fuse F1 is connected with one end of a first lithium battery terminating J1, and the other end of the fuse F1 is connected with an eighth resistor R8, a second resistor R2, a third resistor R3, a first capacitor C1, a first resistor R1 and the drain of a first Pmos field effect transistor Q1.
The first pin of the first voltage detection chip U1 is connected with a third resistor R3, a fourth resistor R4 and the drain electrode of a third Pmos field effect transistor Q3; the second pin of the first voltage detection chip U1 is connected with an eighth resistor R8; the third pin of the first voltage detecting chip U1 is connected to J3 and a fifth resistor R5.
The first pin of the second voltage detection chip U2 is connected with a second resistor R2 and the gate of a third Pmos field effect transistor Q3; a second pin of the second voltage detection chip U2 is connected with a fifth resistor R5, a source electrode of a third Pmos field effect transistor Q3, a second capacitor C2, a source electrode of a fourth Nmos field effect transistor Q4 and a source electrode of a second Nmos field effect transistor Q2; the third pin of the second voltage detecting chip U2 is connected to J4 and the sixth and seventh resistors R6 and R7.
The gate of the first Pmos field effect transistor Q1 is connected with a first resistor R1, the drain of a second Nmos field effect transistor Q2, the gate of a fourth Nmos field effect transistor Q4 and a second capacitor C2; the source of the first Pmos field effect transistor Q1 is connected to the third capacitor C3 and the output terminal VBAT (pin J2).
The gate of the second Nmos field effect transistor Q2 is connected to the drain of the fourth Nmos field effect transistor Q4, the first capacitor C1, and the fourth resistor R4.
One end of the third capacitor C3 is connected to the sixth resistor R6, the seventh resistor R7 and the output terminal GND (pin J5).
The working principle of the protective circuit for preventing the over-discharge of the multi-lithium primary battery in series connection is as follows:
one end of the first lithium battery is connected with J1, and the other end is connected with J3; one end of the second lithium battery is connected with J3, the other end is connected with J4, and F1 is a recoverable fuse with current of 2.5A, so that high-current discharge and short-circuit protection can be prevented; u1 and U2 are the first voltage detection chip and the second voltage detection chip of 2.0V, the first pin outputs low level when the VDD voltage of the first voltage detection chip U1 is lower than 2.0V, and the first pin outputs open-drain state when the VDD voltage of the first voltage detection chip U1 is higher than 2.0V; q1 and Q3 are the first and third Pmos fets, with the Pmos fets GS having a voltage differential, the SD of the Pmos fets being on, otherwise high impedance, and Q2 and Q4 are the second and fourth Nmos fets, with the conduction principle being similar to the Pmos fets conduction principle described above.
If the first lithium battery and the second lithium battery are connected between J1 and J3 and J3 and J4 respectively, and 2 batteries are normally 3.6V, the voltage between pin B2 and pin VSS is 7.2V, the voltage between pin B1 and pin GND near J1 is 3.6V, the voltage detection chip U1 outputs an open-drain state, when pin TP5 is pulled up to 7.2V due to the third resistor R3, GS 3.6V of the second Nmos field effect transistor Q2 is greater than the turn-on voltage, the voltage difference between pin B2 and pin TP1 is 3.6V, Vgs-3.6V of the first Pmos field effect transistor Q1 satisfies the turn-on condition of GS of the first Pmos field effect transistor Q1, so that the voltage of pin VBAT is equal to the voltage at pin B2, and the circuit normally outputs 7.2V.
Assuming that the voltage between the pin B1 and the pin GND close to J1 is lower than 2.0V, i.e., VDD of the second voltage detecting chip U2 is lower than 2.0V, the second voltage detecting chip U2 outputs a low level, i.e., the pin TP6 is low, which causes DS of the third Pmos field effect transistor Q3 to be turned on, the voltage between the pin TP5 and the pin TP4 is equal, the voltage between the pin TP3 and the pin TP4 is equal, the second Nmos field effect transistor Q2 is turned off, the voltage between the pin B2 and the pin TP1 is also equal, the voltage between GS of the first Pmos field effect transistor Q1 is 0, and the first Pmos field effect transistor Q1 is turned off; the first capacitor C1, the fourth resistor R4, the fourth Nmos field effect transistor Q4 and the second capacitor C2 can prevent output change caused by oscillation change of a critical point and play a role of change buffering, the fuse F1, the sixth resistor R6 and the seventh resistor R7 can play a role of short-circuit protection, the third capacitor C3 is a super capacitor, the capacity of the third capacitor C3 is 1F, and the third capacitor C3 mainly plays a role of providing a large-current power supply requirement and preventing switching jitter of a lithium primary battery at a critical voltage point;
assuming that the voltage between pin B1 and pin B2 is lower than 2.0V, i.e. VDD of the first voltage sense die U1 is lower than 2.0V, the voltage of the output voltage pin TP5 of the first voltage sense die is the same as the voltage of the output voltage pin TP4, and the principle is the same.
The voltage detection is performed on the relevant pins of the series connection over-discharge prevention protection circuit of the multi-lithium primary battery of the embodiment 1 to judge the effectiveness of the circuit protection, and the results are shown in the following table.
The series circuit of the multi-section lithium primary battery has excellent over-discharge protection effectiveness, and can solve the problems of over-charge, over-discharge, short circuit and the like in the using process of the lithium primary battery.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The protection circuit for preventing the over-discharge of the multi-section lithium primary battery in series connection is characterized by comprising a lithium battery, a fuse F1, a voltage detection chip, a field effect transistor, a capacitor and a resistor, wherein the lithium battery comprises a first lithium battery and a second lithium battery, the voltage detection chip comprises a first voltage detection chip U1 and a second voltage detection chip U2, the field effect transistor comprises a first field effect transistor Q1, a second field effect transistor Q2, a third field effect transistor Q3 and a fourth field effect transistor Q4, the capacitor comprises a third capacitor C1, a third capacitor C2 and a third capacitor C3, and the resistor comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7 and an eighth resistor R8;
one end of the first lithium battery is connected with a pin J1, and the other end of the first lithium battery is connected with a pin J3; one end of the second lithium battery is connected with a pin J3, and the other end of the second lithium battery is connected with a pin J4;
the fuse F1 is connected with one end of a first lithium battery in a termination J1, and the other end of the fuse F1 is connected with an eighth resistor R8, a second resistor R2, a third resistor R3, a first capacitor C1, a first resistor R1 and the drain electrode of a first field effect transistor Q1;
the first pin of the first voltage detection chip U1 is connected with a third resistor R3, a fourth resistor R4 and the drain electrode of a third field effect transistor Q3; the second pin of the first voltage detection chip U1 is connected with an eighth resistor R8; the third pin of the first voltage detection chip U1 is connected with J3 and a fifth resistor R5;
the first pin of the second voltage detection chip U2 is connected with the second resistor R2 and the gate of the third field effect transistor Q3; a second pin of the second voltage detection chip U2 is connected with a fifth resistor R5, a source electrode of a third field effect transistor Q3, a second capacitor C2, a source electrode of a fourth field effect transistor Q4 and a source electrode of a second field effect transistor Q2; the third pin of the second voltage detection chip U2 is connected with J4, a sixth resistor R6 and a seventh resistor R7;
the gate of the first field effect transistor Q1 is connected with a first resistor R1, the drain of a second field effect transistor Q2, the gate of a fourth field effect transistor Q4 and a second capacitor C2; the source of the first field effect transistor Q1 is connected to the third capacitor C3 and the output terminal VBAT;
the gate of the second field effect transistor Q2 is connected with the drain of a fourth field effect transistor Q4, a first capacitor C1 and a fourth resistor R4;
one end of the third capacitor C3 is connected to the sixth resistor R6, the seventh resistor R7 and the output terminal GND.
2. The protection circuit for preventing over-discharge in series connection of multiple lithium primary batteries according to claim 1, wherein the lithium primary battery is a lithium thionyl chloride battery.
3. The protection circuit of claim 2, wherein the lithium thionyl chloride battery comprises one of an ER14250 lithium thionyl chloride battery and an ER18505 lithium thionyl chloride battery.
4. The protection circuit for preventing over-discharge of serially connected multiple lithium primary batteries according to claim 1, wherein the voltage of the first lithium battery and the voltage of the second lithium battery are both 3.6V.
5. The protection circuit of claim 1, wherein the fuse F1 is a current 2.5A recoverable fuse.
6. The protection circuit of claim 1, wherein the field effect transistor comprises a Pmos field effect transistor and an Nmos field effect transistor.
7. The protection circuit of claim 6, wherein said Pmos field effect transistors comprise a first Pmos field effect transistor Q1 and a third Pmos field effect transistor Q3, and said Nmos field effect transistors comprise a second Nmos field effect transistor Q2 and a fourth Nmos field effect transistor Q4.
8. The protection circuit of claim 1, wherein the third capacitor C3 is a super capacitor.
9. The protection circuit of claim 8, wherein the super capacitor is 1F.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110441076.8A CN113162175B (en) | 2021-04-23 | 2021-04-23 | Protection circuit for preventing multiple lithium primary batteries from over-discharge in serial connection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110441076.8A CN113162175B (en) | 2021-04-23 | 2021-04-23 | Protection circuit for preventing multiple lithium primary batteries from over-discharge in serial connection |
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| CN113162175A true CN113162175A (en) | 2021-07-23 |
| CN113162175B CN113162175B (en) | 2022-11-18 |
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| CN202110441076.8A Active CN113162175B (en) | 2021-04-23 | 2021-04-23 | Protection circuit for preventing multiple lithium primary batteries from over-discharge in serial connection |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101101984A (en) * | 2007-08-01 | 2008-01-09 | 李昭佳 | Circuit board for preventing first lithium battery from over discharge, short circuit and lag removal and its application |
| CN201117764Y (en) * | 2007-11-30 | 2008-09-17 | 天津力神电池股份有限公司 | Device for checking single string lithium ion batteries over-charging, over-discharging voltage-protecting device |
| CN201215817Y (en) * | 2008-07-15 | 2009-04-01 | 无锡华润上华科技有限公司 | Protective circuit for lithium battery |
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2021
- 2021-04-23 CN CN202110441076.8A patent/CN113162175B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101101984A (en) * | 2007-08-01 | 2008-01-09 | 李昭佳 | Circuit board for preventing first lithium battery from over discharge, short circuit and lag removal and its application |
| CN201117764Y (en) * | 2007-11-30 | 2008-09-17 | 天津力神电池股份有限公司 | Device for checking single string lithium ion batteries over-charging, over-discharging voltage-protecting device |
| CN201215817Y (en) * | 2008-07-15 | 2009-04-01 | 无锡华润上华科技有限公司 | Protective circuit for lithium battery |
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| 刘兰兰等: "《一种电池组电压检测电路及管理系统的设计与研究》", 《现代信息科技》 * |
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