CN210404765U

CN210404765U - Lithium battery protection circuit

Info

Publication number: CN210404765U
Application number: CN201920726436.7U
Authority: CN
Inventors: 顾臻钰; 王国强; 吴萍
Original assignee: Wuxi Xunchi Electronic Technology Co ltd
Current assignee: Wuxi Xunchi Electronic Technology Co ltd
Priority date: 2019-05-21
Filing date: 2019-05-21
Publication date: 2020-04-24
Anticipated expiration: 2029-05-21

Abstract

The utility model discloses a lithium battery protection circuit, which is characterized in that the lithium battery protection circuit comprises a protection chip, a control chip, a detection and feedback circuit and a load, wherein the output end of a lithium battery is connected with the input end of the protection chip; the output end of the protection chip is connected with the input end of the control chip on one hand, and the output end of the protection chip is connected with one input end of the detection and feedback circuit on the other hand; the output end of the control chip is connected with the load on one hand, and the output end of the control chip is connected with the other input end of the detection and feedback circuit on the other hand; the output end of the detection and feedback circuit is connected with the input end of the protection chip. The utility model discloses because of the high integration of components and parts, its volume is compared the like product and is reduced by a wide margin, and self loss has also declined a lot moreover. The high-temperature solar water heater is practical for a long time, and in the highly integrated modern society, the components are reduced, the production is convenient, the cost is low, and the product has good development space.

Description

Lithium battery protection circuit

Technical Field

The utility model relates to a chip, resistance and capacitor circuit field specifically are a lithium cell protection circuit.

Background

In recent years, with the rapid development of the mobile internet, smartphones and tablet computers are increasingly used as carriers thereof, and the battery power of the mobile device per se cannot meet the requirements of consumers. It is under such market demands that "gas station" mobile power sources for mobile devices are in force and are rapidly gaining consumer interest. However, at present, many mobile power supplies have an over-safety problem in use, and the situation of explosion is serious, so that the benefits and personal safety of consumers are seriously threatened. As a qualified mobile power supply, the internal safety protection measures are indispensable.

The mobile power supply product generally adopts a mode of connecting a plurality of lithium batteries in parallel to obtain large capacity, thereby meeting the requirements of consumers. Most consumers seek high capacity of the mobile power supply for one side, but neglect safety thereof, which is dangerous, and batteries with larger capacity generally have high energy density, so that better safety protection is needed to ensure safe use of the batteries. The lithium battery can explode and catch fire under the conditions of overcharge, overcurrent, short circuit and the like, so that the personal safety and the property safety are seriously influenced. Therefore, applications for lithium batteries must include protective circuitry.

SUMMERY OF THE UTILITY MODEL

The utility model provides a lithium battery protection circuit, which comprises a protection chip, a control chip, a detection and feedback circuit and a load, wherein the output end of the lithium battery is connected with the input end of the protection chip; the output end of the protection chip is connected with the input end of the control chip on one hand, and the output end of the protection chip is connected with one input end of the detection and feedback circuit on the other hand; the output end of the control chip is connected with the load on one hand, and the output end of the control chip is connected with the other input end of the detection and feedback circuit on the other hand; the output end of the detection and feedback circuit is connected with the input end of the protection chip.

Specifically, the protection chip is IP3001, the control chip is AP5054B, and the specific circuit structure is as follows:

on one hand, the anode of the lithium battery is connected with a second resistor R2 in series to a VDD pin of a protection chip IP3001, the cathode of the lithium battery is directly connected with a GND pin of the protection chip IP3001, an ISET pin of the protection chip IP3001 is connected with the GND pin, a second capacitor C2 is connected between the GND pin and the VDD pin, and a VM pin of the protection chip IP3001 is used for connecting the cathode of a load;

the positive electrode of the lithium battery is connected with a BAT pin of the control chip AP5054, a PROG pin of the control chip AP5054 is connected with the negative electrode of the load through a first resistor R1, a VCC pin of the control chip AP5054 is connected with the positive electrode of the load, and a GND pin of the control chip AP5054 is connected with the negative electrode of the load.

Specifically, the first resistor R1 is 2000 Ω, the second resistor R2 is 100 Ω, and the second capacitor C2 is 2.2 μ F.

Preferably, a first capacitor C1 is connected between the VCC pin and the GND pin of the control chip AP 5054.

Specifically, the first capacitance C1 is 1 μ F.

The beneficial effects of the utility model

The utility model discloses because of the high integration of components and parts, its volume is compared the like product and is reduced by a wide margin, and self loss has also declined a lot moreover. The high-temperature solar water heater is practical for a long time, and in the highly integrated modern society, the components are reduced, the production is convenient, the cost is low, and the product has good development space.

Drawings

FIG. 1 is a block diagram of the present invention

FIG. 2 is a circuit diagram of the present invention

Detailed Description

The present invention will be further explained with reference to the following examples, but the scope of the present invention is not limited thereto:

example 1: as shown in fig. 1, a lithium battery protection circuit includes a protection chip, a control chip, a detection and feedback circuit and a load, wherein an output terminal of a lithium battery is connected to an input terminal of the protection chip; the output end of the protection chip is connected with the input end of the control chip on one hand, and the output end of the protection chip is connected with one input end of the detection and feedback circuit on the other hand; the output end of the control chip is connected with the load on one hand, and the output end of the control chip is connected with the other input end of the detection and feedback circuit on the other hand; the output end of the detection and feedback circuit is connected with the input end of the protection chip.

Example 2: the protection chip is an IP3001 of the english integrated chip technology, the control chip is an AP5054B of the wu-tin-core puniconic microelectronic, and as shown in fig. 2, the specific circuit structure is as follows:

the anode of the lithium battery power supply is connected with a first resistor R1 of 100 omega in series to a pin 3 VDD pin of the IP3001, and the cathode of the lithium battery power supply is directly connected with a pin 2 GND of the IP 3001; the 1 pin ISET pin is used for adjusting the size of the protection current and can also be directly short-circuited with the ground, and a second capacitor C2 of 2.2 muF is connected between the VDD pin and the GND pin in parallel. And the 4-pin VM pin is used for connecting the negative electrode of a charger or a load and is connected with the power MOSFET inside the chip. The 5 feet are empty feet and are suspended in the air.

When the lithium battery is connected with the protection chip IP3001, the lithium battery is regarded as a whole, the anode of the lithium battery is connected with the 3-pin BAT of the control chip AP5054B, and the BAT is the battery connecting end of the AP 5054B. The negative electrode of the battery (after the lithium battery and the protection chip IP3001 are regarded as a whole, the negative electrode of the battery is the four-pin VM of the IP 3001) is connected with the 2-pin GND of the AP 5054B. The negative electrode of the battery needs to be shunted by a first 2K omega resistor R1 to be connected with a 5-pin PROG of the AP5054B, and the 5-pin PROG is used for setting charging current and detecting and turning off the pin. The pin 4 of AP5054B is VCC, and is connected to the positive terminal of a charger or a load, and requires a first capacitor C1 of 1 μ F connected in parallel with the GND pin of AP 5054B.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.

Claims

1. A lithium battery protection circuit is characterized by comprising a protection chip, a control chip, a detection and feedback circuit and a load, wherein the output end of a lithium battery is connected with the input end of the protection chip; the output end of the protection chip is connected with the input end of the control chip on one hand, and the output end of the protection chip is connected with one input end of the detection and feedback circuit on the other hand; the output end of the control chip is connected with the load on one hand, and the output end of the control chip is connected with the other input end of the detection and feedback circuit on the other hand; the output end of the detection and feedback circuit is connected with the input end of the protection chip.

2. The lithium battery protection circuit according to claim 1, wherein the protection chip is IP3001, the control chip is AP5054B, and the specific circuit structure is:

the positive electrode of the lithium battery is connected with a BAT pin of the control chip AP5054, a PROG pin of the control chip AP5054 is connected with the negative electrode of the load through a first resistor R1, a VCC pin of the control chip AP5054 is connected with the positive electrode of the load, a GND pin of the control chip AP5054 is connected with the negative electrode of the load, and a first capacitor C1 is connected between the VCC pin and the GND pin of the control chip AP 5054.

3. The lithium battery protection circuit of claim 2, wherein the first resistor R1 ═ 2000 Ω, the second resistor R2 ═ 100 Ω, the first capacitor C1 ═ 1 μ F, and the second capacitor C2 ═ 2.2 μ F.