CN210183037U

CN210183037U - Single cell charging protection circuit and battery device

Info

Publication number: CN210183037U
Application number: CN201921024192.4U
Authority: CN
Inventors: Xinyao Luo; 罗新耀; Aishen Wu; 吴爱深; Xiaotao Huang; 黄晓涛; Jinqian Pan; 潘金前; Dahui Kuang; 邝达辉
Original assignee: Shida Battery Technology Co Ltd
Current assignee: Shida Battery Technology Co Ltd
Priority date: 2019-07-02
Filing date: 2019-07-02
Publication date: 2020-03-24
Anticipated expiration: 2029-07-02

Abstract

The utility model discloses a monocell protection circuit and battery device that charges, protection circuit include two supply terminals and two ends that charge, two the supply terminal forms two connection branch roads with two end electric connection that charge respectively, and one of them connection branch road is provided with the protection unit that charges of two series connections on the road. The utility model discloses a setting up the protection unit that charges of two mutual series connection on connecting the branch road, for the battery provides dual protection mechanism in battery charging process, when one of them protection unit that charges short-circuit fault appears, the protection circuit that charges still can guarantee battery charging process's reliability, prevents effectively that battery charging protection function from becoming invalid.

Description

Single cell charging protection circuit and battery device

Technical Field

The utility model relates to an electronic circuit technical field, more specifically say and relate to a monocell charging protection circuit and use this protection circuit's battery device.

Background

The existing electric devices occupy a certain proportion of products which are powered by batteries, and manufacturers of the past electric devices generally do not provide a battery charging and discharging protection circuit in the electric devices due to the consideration of cost and the immature consideration of battery charging and discharging technology. However, with the maturity of battery charging and discharging protection technology, various battery charging and discharging protection chips appear on the market to realize the charging and discharging protection power supply of the battery.

For this reason, each enterprise sets up the battery charging protection circuit in the battery-powered electric device, but only sets up the protection circuit of one deck in the ordinary electric device, in case this protection circuit short-circuit fault appears, leads to the charging protection function inefficacy of battery easily to influence the normal life of battery.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: a single cell charging protection circuit configured with a dual protection function and a battery device using the same are provided.

The utility model provides a solution of its technical problem is:

the single battery charging protection circuit comprises two power supply ends and two charging ends, wherein the two power supply ends are respectively electrically connected with the two charging ends to form two connecting branches, and one connecting branch is provided with two charging protection units which are connected in series; the charging protection unit comprises a resistor R1, a resistor R2, a capacitor C1, a protection chip of BMB201B, a MOS tube Q1 and a MOS tube Q2, wherein the resistor R1 and the capacitor C1 are connected in series between two connecting branches, the VDD end of the protection chip is connected between the capacitor R1 and the capacitor C1, the VSS end of the protection chip is connected on a connecting branch where the charging protection unit is located, the DO end and the CO end of the protection chip are respectively connected with the grid of the MOS tube Q1 and the grid of the MOS tube Q2, the drain of the MOS tube Q1 is connected with the drain of the MOS tube Q2, the source of the MOS tube Q1 is connected with the VSS end of the protection chip, and the source of the MOS tube Q2 is connected with the V-end of the protection chip through a resistor R2.

As a further improvement of the above technical solution, the cell charging protection circuit further includes a MOS transistor Q3 and a MOS transistor Q4, the gate, the source, and the drain of the MOS transistor Q3 are respectively connected to the gate, the source, and the drain of the MOS transistor Q1, and the gate, the source, and the drain of the MOS transistor Q4 are respectively connected to the gate, the source, and the drain of the MOS transistor Q2.

As a further improvement of the above technical solution, the MOS transistor Q1 and the MOS transistor Q2 are integrated into a double MOS transistor.

As a further improvement of the above technical solution, the battery cell charging protection circuit further includes an electric quantity indicating module, and an input end of the electric quantity indicating module is connected between the capacitor C1 and the resistor R1.

As a further improvement of the above technical solution, the electric quantity indicating module includes a plurality of comparing units, each of the comparing units includes a comparator, a reference voltage source and an indicator light, one input terminal of the comparator is connected between the resistor R1 and the capacitor C1, the other input terminal of the comparator is connected to the reference voltage source, the output terminal of the comparator is connected to the indicator light, and the output voltages of the reference voltage sources of the comparing units are different.

The application also discloses a battery device, including battery and above arbitrary any the monocell protection circuit that charges, the positive negative pole of battery respectively with two charge end electric connection.

The utility model has the advantages that: the utility model discloses a setting up the protection unit that charges of two mutual series connection on connecting the branch road, for the battery provides dual protection mechanism in battery charging process, when one of them protection unit that charges short-circuit fault appears, the protection circuit that charges still can guarantee battery charging process's reliability, prevents effectively that battery charging protection function from becoming invalid.

Drawings

In order to more clearly illustrate the technical solution in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is clear that the described figures represent only some embodiments of the invention, not all embodiments, and that a person skilled in the art can also derive other designs and figures from these figures without inventive effort.

Fig. 1 is a schematic circuit diagram of the present invention.

Detailed Description

The conception, specific structure, and technical effects of the present application will be described clearly and completely with reference to the accompanying drawings and embodiments, so that the purpose, features, and effects of the present application can be fully understood. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all embodiments, and other embodiments obtained by those skilled in the art without inventive efforts based on the embodiments of the present application belong to the protection scope of the present application. In addition, all the connection relations mentioned herein do not mean that the components are directly connected, but mean that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation. All technical characteristics in the invention can be interactively combined on the premise of not conflicting with each other. Finally, it should be noted that the terms "center, upper, lower, left, right, vertical, horizontal, inner, outer" and the like as used herein refer to an orientation or positional relationship based on the drawings, which is only for convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application.

Referring to fig. 1, the present application discloses a single battery charging protection circuit, a first embodiment of which includes two power supply terminals and two charging terminals, where the two power supply terminals are electrically connected with the two charging terminals respectively to form two connection branches, and one of the connection branches is provided with two charging protection units connected in series; the charging protection unit comprises a resistor R1, a resistor R2, a capacitor C1, a protection chip of BMB201B, a MOS tube Q1 and a MOS tube Q2, wherein the resistor R1 and the capacitor C1 are connected in series between two connecting branches, the VDD end of the protection chip is connected between the capacitor R1 and the capacitor C1, the VSS end of the protection chip is connected on a connecting branch where the charging protection unit is located, the DO end and the CO end of the protection chip are respectively connected with the grid of the MOS tube Q1 and the grid of the MOS tube Q2, the drain of the MOS tube Q1 is connected with the drain of the MOS tube Q2, the source of the MOS tube Q1 is connected with the VSS end of the protection chip, the source of the MOS tube Q2 is connected with the V-end of the protection chip through a resistor R2, and the source of the MOS tube Q1 and the source of the MOS tube Q2 are respectively connected with the charging end and the power supply end of the same connecting branch. Specifically, through setting up two charging protection units that establish ties each other on connecting the branch in this embodiment, provide dual protection mechanism for the battery in battery charging process, when one of them charging protection unit short-circuit fault appears, charging protection circuit still can guarantee battery charging process's reliability, effectively prevents that battery charging protection function from failing.

Further as a preferred embodiment, in this embodiment, the single cell charging protection circuit further includes a MOS transistor Q3 and a MOS transistor Q4, the gate, the source, and the drain of the MOS transistor Q3 are respectively connected to the gate, the source, and the drain of the MOS transistor Q1, the gate, the source, and the drain of the MOS transistor Q4 are respectively connected to the gate, the source, and the drain of the MOS transistor Q2, and in order to make the single cell charging protection circuit suitable for a large-current power supply battery, a MOS transistor Q3 and a MOS transistor Q4 are further provided in this embodiment, the MOS transistor Q3 is connected in parallel to the MOS transistor Q1, and the MOS transistor Q4 is connected in parallel to the MOS transistor Q2, so as to increase the battery charging current and prevent a single MOS transistor from being burned out due to an excessive current.

Further, in a preferred embodiment, in the present embodiment, the MOS transistor Q1 and the MOS transistor Q2 are integrated into a double MOS transistor, and the model of the double MOS transistor is FNK0202 EB.

Further, as a preferred implementation manner, the present embodiment is configured with a function of prompting the external battery power, and the present embodiment is configured with a power indication module, where an input end of the power indication module is connected between the capacitor C1 and the resistor R1.

Specifically, in this embodiment, the electric quantity indicating module includes a plurality of comparing units, each of the comparing units includes a comparator, a reference voltage source and an indicator light, one input terminal of the comparator is connected between the resistor R1 and the capacitor C1, the other input terminal of the comparator is connected to the reference voltage source, the output terminal of the comparator is connected to the indicator light, and the output voltages of the reference voltage sources of the comparing units are different. Of course, in this embodiment, the comparator is not necessarily directly electrically connected to the indicator light, and the driving current of the comparator to the indicator light may be increased by a driving circuit. In this embodiment, since the output voltages of the reference voltage sources in the comparison units are different from each other, the different battery voltages can make the lighting combination conditions of the indicator lamps of different comparison units different, and therefore, the amount of the electric quantity of the battery can be identified according to the lighting combination conditions of the indicator lamps in the comparison units.

The application also discloses a battery device, and a first embodiment of the battery device comprises a battery and the single battery charging protection circuit, wherein the positive electrode and the negative electrode of the battery are respectively and electrically connected with the two charging ends.

While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited to the details of the embodiments, but is capable of various modifications and substitutions without departing from the spirit of the invention.

Claims

1. A cell charging protection circuit, characterized by: the charging protection circuit comprises two power supply ends and two charging ends, wherein the two power supply ends are respectively electrically connected with the two charging ends to form two connecting branches, and one connecting branch is provided with two charging protection units which are connected in series; the charging protection unit comprises a resistor R1, a resistor R2, a capacitor C1, a protection chip of BMB201B, a MOS tube Q1 and a MOS tube Q2, wherein the resistor R1 and the capacitor C1 are connected in series between two connecting branches, the VDD end of the protection chip is connected between the capacitor R1 and the capacitor C1, the VSS end of the protection chip is connected on a connecting branch where the charging protection unit is located, the DO end and the CO end of the protection chip are respectively connected with the grid of the MOS tube Q1 and the grid of the MOS tube Q2, the drain of the MOS tube Q1 is connected with the drain of the MOS tube Q2, the source of the MOS tube Q1 is connected with the VSS end of the protection chip, and the source of the MOS tube Q2 is connected with the V-end of the protection chip through a resistor R2.

2. The cell charge protection circuit according to claim 1, characterized in that: the transistor comprises a MOS transistor Q3 and a MOS transistor Q4, wherein the grid electrode, the source electrode and the drain electrode of the MOS transistor Q3 are respectively connected with the grid electrode, the source electrode and the drain electrode of the MOS transistor Q1, and the grid electrode, the source electrode and the drain electrode of the MOS transistor Q4 are respectively connected with the grid electrode, the source electrode and the drain electrode of the MOS transistor Q2.

3. The cell charge protection circuit according to claim 1, characterized in that: the MOS transistor Q1 and the MOS transistor Q2 are integrated in a double MOS transistor.

4. The cell charge protection circuit according to claim 1, characterized in that: the electric quantity indicating device further comprises an electric quantity indicating module, and the input end of the electric quantity indicating module is connected between the capacitor C1 and the resistor R1.

5. The cell charge protection circuit according to claim 4, characterized in that: the electric quantity indicating module comprises a plurality of comparing units, each comparing unit comprises a comparator, a reference voltage source and an indicating lamp, one input end of the comparator is connected between the resistor R1 and the capacitor C1, the other input end of the comparator is connected with the reference voltage source, the output end of the comparator is connected with the indicating lamp, and the output voltages of the reference voltage sources of the comparing units are different.

6. A battery device, characterized in that: the single battery charging protection circuit comprises a battery and the single battery charging protection circuit according to any one of claims 1 to 5, wherein the positive electrode and the negative electrode of the battery are respectively and electrically connected with two charging terminals.