CN211958845U - Two-section lithium battery protection circuit - Google Patents

Two-section lithium battery protection circuit Download PDF

Info

Publication number
CN211958845U
CN211958845U CN202021067767.3U CN202021067767U CN211958845U CN 211958845 U CN211958845 U CN 211958845U CN 202021067767 U CN202021067767 U CN 202021067767U CN 211958845 U CN211958845 U CN 211958845U
Authority
CN
China
Prior art keywords
battery
electrode
mos tube
resistor
pin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202021067767.3U
Other languages
Chinese (zh)
Inventor
刘广宇
沈昱
司振龙
雷新卓
陈炜
于会师
黄超
严伟
季中杰
卢伟
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JIANGSU NORTH HUGUANG OPTICS ELECTRONICS CO Ltd
Original Assignee
JIANGSU NORTH HUGUANG OPTICS ELECTRONICS CO Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JIANGSU NORTH HUGUANG OPTICS ELECTRONICS CO Ltd filed Critical JIANGSU NORTH HUGUANG OPTICS ELECTRONICS CO Ltd
Priority to CN202021067767.3U priority Critical patent/CN211958845U/en
Application granted granted Critical
Publication of CN211958845U publication Critical patent/CN211958845U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The utility model discloses a two sections lithium cell protection circuit belongs to electronic circuit technical field. The two lithium battery protection circuits comprise a power management chip N1, an MOS tube V2 and a diode V1, wherein the source electrode of the MOS tube V2 is connected with the anode of the diode V1, the cathode of the diode V1 is connected with the N1 pin of the power management chip, the drain electrode of the MOS tube V2 is connected with the positive electrode of a battery, and the grid electrode of the MOS tube V2 is connected with the negative electrode of the battery; when the battery is correctly installed, the grid of the MOS transistor V2 is at a low level, and the MOS transistor V2 is conducted; when the battery is reversely connected, the grid of the MOS tube V2 is at a high level, and the MOS tube V2 is turned off. The utility model provides a two-section lithium battery protection circuit which not only has the functions of overcharge protection, overdischarge protection and short circuit protection, but also has the function of preventing reverse installation of batteries; the two lithium battery protection circuits are designed based on a domestic chip and an MOS (metal oxide semiconductor) tube, and the development requirement of the localization of the protection circuits is met.

Description

Two-section lithium battery protection circuit
Technical Field
The utility model relates to an electronic circuit technical field, in particular to two sections lithium cell protection circuits.
Background
At present, more and more lithium battery powered devices are adopted in the field of military supplies, compared with plug-in devices, the lithium battery powered devices greatly improve the portability and maneuverability of the devices, but the lithium batteries also have a defect that the voltage of a single lithium battery is smaller than 3.4V generally, if the powered devices need higher power supply voltage, a plurality of lithium batteries must be connected in series for use, generally, the common problem is that the problem of how to reliably protect the double lithium batteries is solved.
In the prior art, a plurality of protection circuits are provided, but most of the protection circuits only have overshoot and over-discharge functions, are built by using foreign imported chips, have single protection functions, cannot meet the requirements of 100% localization of military and the requirements of higher product reliability, and cause the development of some products to be limited.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a two sections lithium cell protection circuit to in solving current military supplies, in order to increase the portability of equipment, use two sections lithium cells to carry out reliable power supply usually, protect function is single, can't satisfy the problem of product reliability demand.
In order to solve the technical problem, the utility model provides a two sections lithium cell protection circuits, including power management chip N1, MOS pipe V2 and diode V1, wherein, MOS pipe V2 source connects diode V1's positive pole, diode V1's negative pole connects power management chip N1 pin, MOS pipe V2 drain electrode is connected with the battery positive electrode, and the grid is connected with the battery negative electrode;
when the battery is correctly installed, the grid of the MOS transistor V2 is at a low level, and the MOS transistor V2 is conducted; when the battery is reversely connected, the grid electrode of the MOS tube V2 is at a high level, and the MOS tube V2 is turned off.
Optionally, the model of the power management chip N1 is PT6302S, wherein,
the VCC pin is connected with the cathode of a diode V1 through a resistor R2 and connected with the cathode of a battery through a capacitor C6;
the pin B2 is connected with the anode of a diode V1 through a resistor R3; and is connected with the negative electrode of the battery through a capacitor C3;
the B1 pin is connected with the anode of a diode V1 through a resistor R6 and a resistor R4 in sequence, and is connected with the cathode of a battery through a capacitor C4;
the VSS pin is connected with a power negative electrode;
the CDR pin is connected with the grid electrode of a MOS tube Q2 through a resistor R5, and the drain electrode of the MOS tube Q2 is connected with the drain electrode of a MOS tube Q1;
the DDR pin is connected with the grid electrode of an MOS tube Q1 through a resistor R7, and the source electrode of the MOS tube Q1 is connected with the negative electrode of a battery;
the LM pin is connected with the negative electrode of the battery through a resistor R10.
Optionally, the two lithium battery protection circuits further include resistors R1, R8, and R9, wherein,
the resistor R1 is connected between the grid of the MOS transistor V2 and the negative electrode of the battery; one end of the resistor R8 is connected between the resistor R4 and the resistor R6, and the other end is connected with a negative electrode of the battery;
one end of the resistor R9 is connected with the LM pin, and the other end is connected between the drain of the MOS tube Q1 and the drain of the MOS tube Q2.
Optionally, the two lithium battery protection circuits further include capacitors C1, C2, C5 and C7, wherein,
one end of the capacitor C1 is connected with the source electrode of the MOS transistor V2, and the other end of the capacitor C1 is grounded;
the capacitor C2 is connected in parallel between the positive electrode and the negative electrode of the battery;
one end of the capacitor C5 is connected with the LM pin of the power management chip N1, and the other end of the capacitor C5 is connected with the negative electrode of the battery;
the capacitor C7 is connected in parallel with the MOS transistor Q1, and two ends of the capacitor C7 are respectively electrically connected with the source and the drain of the MOS transistor Q1.
The utility model provides a pair of two sections lithium cell protection circuits, including power management chip N1, MOS pipe V2 and diode V1, wherein, MOS pipe V2 source connects diode V1's positive pole, diode V1's negative pole connects power management chip N1 pin, MOS pipe V2 drain electrode is connected with the battery positive electrode, and the grid is connected with the battery negative electrode; when the battery is correctly installed, the grid of the MOS transistor V2 is at a low level, and the MOS transistor V2 is conducted; when the battery is reversely connected, the grid electrode of the MOS tube V2 is at a high level, and the MOS tube V2 is turned off. The utility model provides a two-section lithium battery protection circuit which not only has the functions of overcharge protection, overdischarge protection and short circuit protection, but also has the function of preventing reverse installation of batteries; compare in traditional power protection circuit and adopt foreign import chip to build, two sections lithium battery protection circuit have satisfied the development demand of protection circuit localization based on the design of domestic chip and MOS pipe.
Drawings
Fig. 1 is a schematic structural diagram of a two-section lithium battery protection circuit provided by the present invention.
Detailed Description
The following provides a further detailed description of a two-section lithium battery protection circuit according to the present invention with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more fully apparent from the following description and appended claims. It should be noted that the drawings are in simplified form and are not to precise scale, and are provided for convenience and clarity in order to facilitate the description of the embodiments of the present invention.
Example one
The utility model provides a two sections lithium cell protection circuit, its structure is shown in figure 1.
The power supply management circuit comprises a power supply management chip N1, an MOS tube V2 and a diode V1, wherein the source electrode of the MOS tube V2 is connected with the anode electrode of a diode V1, the cathode electrode of the diode V1 is connected with the N1 pin of the power supply management chip, the drain electrode of the MOS tube V2 is connected with the positive electrode of a battery, and the grid electrode of the MOS tube V2 is connected with the negative electrode of the battery;
when the battery is correctly installed, the grid of the MOS transistor V2 is at a low level, and the MOS transistor V2 is conducted; when the battery is reversely connected, the grid electrode of the MOS tube V2 is at a high level, and the MOS tube V2 is turned off.
Specifically, in the first embodiment, the model of the power management chip N1 is PT6302S, wherein a VCC pin of the power management chip N1 of PT6302S is connected to a negative electrode of a diode V1 through a resistor R2, and is connected to a negative electrode of a battery through a capacitor C6, and the resistor R2 not only has a current limiting function, but also forms a low-pass filter circuit with the capacitor C6; the pin B2 is connected with the anode of a diode V1 through a resistor R3; the capacitor C3 is connected with a negative electrode of the battery, and the resistor R3 not only has a current limiting function, but also has a low-pass filtering function with the capacitor C3; the B1 pin is connected with the anode of a diode V1 through resistors R6 and R4 in sequence, and is connected with the negative electrode of a battery through a capacitor C4, the resistor R6 has a current-limiting protection effect, and also has a low-pass filtering effect with the capacitor C4, and the resistor R4 has a voltage division effect; the VSS pin is connected with a power negative electrode; when the battery voltage is detected to be greater than 4.2V, the CDR pin of the power management chip N1 outputs low level, the MOS tube Q2 is controlled to be turned off, the overcharge protection is formed, and when the battery voltage is lower than 4.2V but greater than the over-discharge threshold voltage, the circuit is recovered to be normal.
The CDR pin is connected with the grid electrode of a MOS tube Q2 through a resistor R5, and the drain electrode of the MOS tube Q2 is connected with the drain electrode of a MOS tube Q1; the DDR pin is connected with a grid electrode of an MOS tube Q1 through a resistor R7, a source electrode of the MOS tube Q1 is connected with a negative electrode of a battery, and the resistor R5 and the resistor R7 have the function of current-limiting protection; the LM pin is connected with the negative electrode of the battery through a resistor R10. When the battery voltage is detected to be less than 2.7V, the DDR pin of the power management chip N1 outputs a low level, the MOS tube Q1 is controlled to be turned off, over-discharge protection is formed, and when the battery voltage is higher than 2.7V but less than the over-charge threshold voltage, the circuit returns to normal. When a load has a short circuit, the DDR pin of the power management chip N1 outputs a low level to control the MOS transistor Q1 to be switched off, so that short circuit protection is formed, and when the load returns to be normal, the circuit returns to be normal.
The two lithium battery protection circuits further comprise resistors R1, R8 and R9, wherein the resistor R1 is a current-limiting resistor, is connected between the grid of the MOS transistor V2 and the negative electrode of the battery, and is used for protecting the grid of the MOS transistor V2; one end of the resistor R8 is connected between the resistor R4 and the resistor R6, and the other end is connected with a negative electrode of the battery to play a role of voltage division; one end of the resistor R9 is connected with the LM pin, and the other end is connected between the drain of the MOS tube Q1 and the drain of the MOS tube Q2.
The two lithium battery protection circuits further comprise capacitors C1, C2, C5 and C7 which play a role in filtering, wherein one end of the capacitor C1 is connected with the source electrode of the MOS transistor V2, and the other end of the capacitor C1 is grounded; the capacitor C2 is connected in parallel between the positive electrode and the negative electrode of the battery; one end of the capacitor C5 is connected with the LM pin of the power management chip N1, and the other end of the capacitor C5 is connected with the negative electrode of the battery; the capacitor C7 is connected in parallel with the MOS transistor Q1, and two ends of the capacitor C7 are respectively electrically connected with the source and the drain of the MOS transistor Q1.
The utility model provides a two-section lithium battery protection circuit which not only has the functions of overcharge protection, overdischarge protection and short circuit protection, but also has the function of preventing reverse installation of batteries; compare in traditional power protection circuit and adopt foreign import chip to build, two sections lithium battery protection circuit have satisfied the development demand of protection circuit localization based on the design of domestic chip and MOS pipe.
The above description is only for the preferred embodiment of the present invention and is not intended to limit the scope of the present invention, and any modification and modification made by those skilled in the art according to the above disclosure are all within the scope of the claims.

Claims (4)

1. A two-lithium battery protection circuit is characterized by comprising a power management chip N1, an MOS tube V2 and a diode V1, wherein the source electrode of the MOS tube V2 is connected with the anode of the diode V1, the cathode electrode of the diode V1 is connected with the N1 pin of the power management chip, the drain electrode of the MOS tube V2 is connected with the positive electrode of a battery, and the grid electrode of the MOS tube V2 is connected with the negative electrode of the battery;
when the battery is correctly installed, the grid of the MOS transistor V2 is at a low level, and the MOS transistor V2 is conducted; when the battery is reversely connected, the grid electrode of the MOS tube V2 is at a high level, and the MOS tube V2 is turned off.
2. The two-lithium battery protection circuit of claim 1, wherein the power management chip N1 is model number PT6302S, wherein,
the VCC pin is connected with the cathode of a diode V1 through a resistor R2 and connected with the cathode of a battery through a capacitor C6;
the pin B2 is connected with the anode of a diode V1 through a resistor R3; and is connected with the negative electrode of the battery through a capacitor C3;
the B1 pin is connected with the anode of a diode V1 through a resistor R6 and a resistor R4 in sequence, and is connected with the cathode of a battery through a capacitor C4;
the VSS pin is connected with a power negative electrode;
the CDR pin is connected with the grid electrode of a MOS tube Q2 through a resistor R5, and the drain electrode of the MOS tube Q2 is connected with the drain electrode of a MOS tube Q1;
the DDR pin is connected with the grid electrode of an MOS tube Q1 through a resistor R7, and the source electrode of the MOS tube Q1 is connected with the negative electrode of a battery;
the LM pin is connected with the negative electrode of the battery through a resistor R10.
3. The two-lithium battery protection circuit of claim 2, further comprising resistors R1, R8 and R9, wherein,
the resistor R1 is connected between the grid of the MOS transistor V2 and the negative electrode of the battery; one end of the resistor R8 is connected between the resistor R4 and the resistor R6, and the other end is connected with a negative electrode of the battery;
one end of the resistor R9 is connected with the LM pin, and the other end is connected between the drain of the MOS tube Q1 and the drain of the MOS tube Q2.
4. The two-lithium battery protection circuit of claim 2, further comprising capacitors C1, C2, C5 and C7, wherein,
one end of the capacitor C1 is connected with the source electrode of the MOS transistor V2, and the other end of the capacitor C1 is grounded;
the capacitor C2 is connected in parallel between the positive electrode and the negative electrode of the battery;
one end of the capacitor C5 is connected with the LM pin of the power management chip N1, and the other end of the capacitor C5 is connected with the negative electrode of the battery;
the capacitor C7 is connected in parallel with the MOS transistor Q1, and two ends of the capacitor C7 are respectively electrically connected with the source and the drain of the MOS transistor Q1.
CN202021067767.3U 2020-06-11 2020-06-11 Two-section lithium battery protection circuit Active CN211958845U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202021067767.3U CN211958845U (en) 2020-06-11 2020-06-11 Two-section lithium battery protection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202021067767.3U CN211958845U (en) 2020-06-11 2020-06-11 Two-section lithium battery protection circuit

Publications (1)

Publication Number Publication Date
CN211958845U true CN211958845U (en) 2020-11-17

Family

ID=73159069

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202021067767.3U Active CN211958845U (en) 2020-06-11 2020-06-11 Two-section lithium battery protection circuit

Country Status (1)

Country Link
CN (1) CN211958845U (en)

Similar Documents

Publication Publication Date Title
CN204721079U (en) Dual-power automatic switching and charging circuit
CN202712892U (en) Battery management system and load detection circuit thereof
CN204407954U (en) Multiinputoutput fills portable power source soon
CN101888097A (en) Micro-power consumption high-capacity lithium-ion power battery group management device
CN106712174B (en) Automatic switching method for power supply and communication of lithium ion storage battery pack
CN204794241U (en) Controllable discharge device that fills reaches equalizer circuit based on super capacitor of this device
CN202014087U (en) Lithium battery charging protection circuit for portable system
CN211958845U (en) Two-section lithium battery protection circuit
CN102231516B (en) Battery protection board, power battery and power battery pack
CN203491749U (en) Power supply management circuit
CN106356987A (en) RTC (real time clock) circuit
CN101420131A (en) Energy saving control method for lithium ionic battery protection circuit and control circuit thereof
CN111525660A (en) Two-section series lithium battery protection circuit
CN105811502A (en) OZ8952 chip based improved type lithium battery pack management circuit
CN202997677U (en) Video server uninterrupted protection power system used in train
CN201307773Y (en) Energy-saving control circuit of lithium ion battery
CN201260085Y (en) Solar energy controller
CN205335912U (en) Battery and mobile terminal
CN204886151U (en) Return difference formula battery over discharge protection module
CN103490474B (en) A kind of electric power management circuit
CN212726547U (en) Solar supplementary power supply system based on primary battery and composite capacitor
CN210985720U (en) Mixed type battery pack charging and discharging control system
CN211075543U (en) Novel parallelly connected lithium ion is listed as tail battery
CN212659989U (en) Circuit of battery leak protection liquid
CN212063584U (en) Battery charging path management circuit and corresponding terminal equipment

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant