CN112787312A

CN112787312A - Three-level protection system of floor sweeping robot lithium battery BMS

Info

Publication number: CN112787312A
Application number: CN202110138141.XA
Authority: CN
Inventors: 李钱欢; 甘小鹏; 于利银
Original assignee: Suzhou Taiding Intelligent Technology Co ltd
Current assignee: Suzhou Taiding Intelligent Technology Co ltd
Priority date: 2021-02-01
Filing date: 2021-02-01
Publication date: 2021-05-11

Abstract

The invention discloses a three-level protection system of a floor sweeping robot lithium battery BMS, which comprises a power supply module, wherein the power supply module is respectively connected with a data detection module, a communication module, an MCU (microprogrammed control unit) main control module, a charging and discharging protection module and a wake-up module through circuits, the communication module and the data detection module are respectively connected with one side of the MCU main control module through circuits, and the other side of the MCU main control module is respectively connected with the charging and discharging protection module and the wake-up module. The invention has the beneficial effects that: MCU passes through the voltage that data detection module detected, battery total voltage, data such as battery temperature confirm whether continue safe charging or when the battery is in the release use to the battery, whether continue to discharge, also protects the problem that the too big battery safety and life-span that leads to of electric current among the charge-discharge process simultaneously, protects the safety of battery through tertiary charge-discharge voltage protection module simultaneously.

Description

Three-level protection system of floor sweeping robot lithium battery BMS

Technical Field

The invention relates to the technical field of lithium battery management systems in small household appliances, in particular to a three-level protection system of a lithium battery BMS of a sweeping robot.

Background

With the artificial intelligence, the lithium battery becomes an essential key component which is widely applied in the intelligent process of the electrical appliance, and the lithium battery becomes the best choice for supplying power to the household intelligent equipment with the advantages of small volume, high energy density, long cycle life, low self-discharge rate and the like.

However, the lithium battery has low safety and stability, and overcharge and overdischarge not only have adverse effects on the service life of the lithium battery, but even seriously may cause damage to the intelligent device, and more seriously may cause fire accidents, so that a lithium battery management system for ensuring safe operation and long-term operation of the lithium battery is indispensable.

At present stage, a lithium battery system of the intelligent equipment mostly adopts an MCU + MOS integrated circuit to carry out secondary protection, a little better temperature protection is added, some protection is carried out through a fuse, the protection plays some roles, but because the precision is not high, a lot of fuses need to be replaced, and some intelligent equipment or even the intelligent equipment is damaged, the protection effect cannot be completely played.

Disclosure of Invention

The invention aims to provide a three-level protection system for a lithium battery BMS of a sweeping robot, which aims to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a tertiary protection system of robot lithium cell BMS sweeps floor, includes power module, power module is connected with data detection module, communication module, MCU host system, charge-discharge protection module, awakening module through the circuit respectively, communication module with data detection module all through the circuit with MCU host system one side is connected, MCU host system opposite side respectively with charge-discharge protection module, awakening module connect.

Preferably, a battery voltage and temperature acquisition module, a total current detection module, a fuel gauge module and a charging voltage acquisition and charger awakening module are respectively arranged in the data detection module.

Preferably, a three-level charge-discharge voltage protection module and a two-level current protection module are respectively arranged in the charge-discharge protection module.

Preferably, a discharging awakening module, a charging awakening module and a switch awakening module are respectively arranged in the awakening module.

Preferably, the MCU main control module is configured to analyze and perform logic operation according to the battery voltage and temperature acquisition module and the total current detection module in the data detection module.

Preferably, the data detection module is used for detecting the voltage of the single battery, the total voltage of the battery, the temperature of the battery, the electric quantity of the battery and the charging voltage.

Preferably, the electricity meter module is configured to calculate the SOC mathematically for the voltage, the current and the time by a calculus algorithm.

Preferably, the three-stage charge-discharge voltage protection module is divided into three stages, wherein the first stage is used for protecting the battery through the control MOS tube when the voltage is higher than 4.0175V or lower than 2.8V, the second stage is used for charge-discharge protection of the battery when the voltage is higher than 4.2V +/-0.025V or lower than 2.0V +/-0.08V, and the third stage is used for protecting charging through the battery secondary protection chip and charge protection of the battery when the voltage is higher than 4.35V +/-0.025V.

Advantageous effects

According to the three-level protection system of the sweeping robot lithium battery BMS, provided by the invention, the MCU determines whether to continuously and safely charge the battery or whether to continuously discharge the battery when the battery is released and used according to the voltage, the total voltage of the battery, the temperature of the battery and other data detected by the data detection module, and simultaneously protects the safety and the service life of the battery caused by overlarge current in the charging and discharging process, and simultaneously protects the safety of the battery through the three-level charging and discharging voltage protection module.

Drawings

FIG. 1 is a schematic block diagram of the present invention;

FIG. 2 is a schematic diagram of the three-level protection of the present invention;

FIG. 3 is a circuit diagram of a second level protection chip according to the present invention;

FIG. 4 is a circuit diagram of a third level protection chip according to the present invention;

fig. 5 is a schematic diagram of an internal circuit of the charging secondary protection chip according to the present invention.

Reference numerals

The system comprises a power supply module, a data detection module, a 3-MCU (micro control unit) main control module, a 4-charge and discharge protection module, a 5-awakening module, a 6-temperature acquisition module, a 7-total current detection module, an 8-coulometer module, a 9-charger awakening module, a 10-communication module, a 11-three-level charge and discharge voltage protection module, a 12-two-level current protection module, a 13-discharge awakening module, a 14-charge awakening module and a 15-switch awakening module.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

Examples

As shown in fig. 1-5, a three-level protection system of a floor-sweeping robot lithium battery BMS includes a power module 1, the power module 1 is connected with a data detection module 2, a communication module 10, an MCU master control module 3, a charging and discharging protection module 4, and a wake-up module 5 through circuits, the communication module 10 is connected with one side of the MCU master control module 3 through circuits, and the other side of the MCU master control module 3 is connected with the charging and discharging protection module 4 and the wake-up module 5 respectively.

Preferably, the data detection module 2 is internally provided with a battery voltage and temperature acquisition module 6, a total current detection module 7, a fuel gauge module 8 and a charging voltage acquisition and charger awakening module 9 respectively.

Preferably, the charging and discharging protection module 4 is internally provided with a three-level charging and discharging voltage protection module 11 and a two-level current protection module 12.

Preferably, the wake-up module 5 is provided with a discharge wake-up module 13, a charge wake-up module 14 and a switch wake-up module 15.

Preferably, the MCU main control module 3 is configured to perform analysis and logic operation according to the battery voltage and temperature acquisition module 6 and the total current detection module 7 in the data detection module 2.

Preferably, the data detection module 2 is used for detecting the voltage of the single battery, the total voltage of the battery, the temperature of the battery, the electric quantity of the battery and the charging voltage.

Preferably, the fuel gauge module 8 is configured to calculate the SOC mathematically for voltage, current and time by means of a calculus algorithm.

Preferably, the three-stage charging and discharging voltage protection module 11 is divided into three stages, the first stage is used for protecting the battery through the control MOS transistor when the voltage is higher than 4.0175V or lower than 2.8V, the second stage is used for charging and discharging the battery when the voltage is higher than 4.2V ± 0.025V or lower than 2.0V ± 0.08V, and the third stage is used for protecting the charging through the secondary battery protection chip and charging the battery when the voltage is higher than 4.35V ± 0.025V.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the content of the present invention within the scope of the protection of the present invention.

Claims

1. The utility model provides a tertiary protection system of robot lithium cell BMS sweeps floor, includes power module (1), its characterized in that: the power module (1) is connected with the data detection module (2), the communication module (10), the MCU main control module (3), the charge and discharge protection module (4) and the awakening module (5) through circuits respectively, the communication module (10) is connected with the data detection module (2) through circuits and the MCU main control module (3) one side, and the MCU main control module (3) is connected with the charge and discharge protection module (4) and the awakening module (5) through another side.

2. The three-level protection system of the lithium battery BMS of the floor sweeping robot as claimed in claim 1, wherein: the data detection module (2) is internally provided with a battery voltage and temperature acquisition module (6), a total current detection module (7), a fuel gauge module (8) and a charging voltage acquisition and charger awakening module (9) respectively.

3. The three-level protection system of the lithium battery BMS of the floor sweeping robot as claimed in claim 1, wherein: and a three-level charge-discharge voltage protection module (11) and a two-level current protection module (12) are respectively arranged in the charge-discharge protection module (4).

4. The three-level protection system of the lithium battery BMS of the floor sweeping robot as claimed in claim 1, wherein: and a discharging awakening module (13), a charging awakening module (14) and a switch awakening module (15) are respectively arranged in the awakening module (5).

5. The three-level protection system of the lithium battery BMS of the floor sweeping robot as claimed in claim 1, wherein: the MCU main control module (3) is used for analyzing and carrying out logic operation according to the battery voltage and temperature acquisition module (6) in the data detection module (2) and the total current detection module (7).

6. The three-level protection system of the lithium battery BMS of the floor sweeping robot as claimed in claim 1, wherein: the data detection module (2) is used for detecting the voltage of the single battery, the total voltage of the battery, the temperature of the battery, the electric quantity of the battery and the charging voltage.

7. The three-level protection system of the lithium battery BMS of the floor sweeping robot as claimed in claim 2, wherein: the fuel gauge module (8) is used for calculating the SOC through a micro-integration algorithm by a mathematical method for voltage, current and time.

8. The three-level protection system of the lithium battery BMS of the floor sweeping robot as claimed in claim 1, wherein: the three-level charging and discharging voltage protection module (11) is divided into three levels, the first level is used for protecting the battery through a control MOS tube when the voltage is higher than 4.0175V or lower than 2.8V, the second level is used for charging and discharging the battery when the voltage is higher than 4.2V +/-0.025V or lower than 2.0V +/-0.08V, the third level is used for protecting charging through a battery secondary protection chip, and the battery is charged and protected when the voltage is higher than 4.35V +/-0.025.