CN112865228A

CN112865228A - Battery protection circuit and mobile terminal

Info

Publication number: CN112865228A
Application number: CN202110028669.1A
Authority: CN
Inventors: 阮思旭; 杨波; 王瑞
Original assignee: Huizhou TCL Mobile Communication Co Ltd
Current assignee: Huizhou TCL Mobile Communication Co Ltd
Priority date: 2021-01-11
Filing date: 2021-01-11
Publication date: 2021-05-28

Abstract

The invention provides a battery protection circuit, which is provided with a voltage detection positive port and a voltage detection negative port and comprises a battery cell, at least one battery protection chip, a positive leading-out link and a negative leading-out link, wherein the positive leading-out link and the negative leading-out link are respectively and electrically connected with the positive electrode and the negative electrode of the battery cell and are respectively and electrically connected with the voltage detection positive port and the voltage detection negative port, so that when the battery protection circuit is in a charging state, when the voltage of the battery cell is detected, the voltage of the battery cell is directly detected without other circuit components, thereby avoiding the problem that the detected voltage of the battery cell is too large due to the influence of the voltage drop of devices in the battery protection circuit, the battery cell enters a constant voltage charging stage too early to increase the charging time, due to the introduction of the switching unit on the positive lead-out link, the battery cell can be prevented from being over-discharged.

Description

Battery protection circuit and mobile terminal

Technical Field

The invention relates to the technical field of communication, in particular to a battery protection circuit and a mobile terminal.

Background

In recent years, rapid charging technology applied to mobile terminals has been developed rapidly, the charging power of the mobile terminals has been increased from 10W to 25W, 40W, 50W, or even 65W, and as the charging power is increased, the current flowing through the battery of the mobile terminal is increased during charging, so that the voltage drop of the battery protection board of the mobile terminal is increased during charging. When charging, the mobile terminal can detect the voltage of the battery electric core in real time, and when the voltage of the battery electric core increases to a certain value, the mobile terminal is controlled to enter a constant voltage charging stage.

However, due to the increase of voltage drop of the battery protection board of the mobile terminal caused by the increase of current during charging, the voltage of the battery electric core detected by the mobile terminal in real time is larger than the actual voltage of the battery electric core, so that the mobile terminal enters a constant voltage charging stage too early, and the charging time of the mobile terminal is further increased.

Disclosure of Invention

The invention provides a battery protection circuit and a mobile terminal, which effectively solve the problem that in the process of charging the mobile terminal, the voltage of a battery cell detected by the mobile terminal is larger than the actual voltage due to the influence of the voltage drop of a device in a battery protection board, so that the mobile terminal enters a constant voltage charging stage too early and the charging time of the mobile terminal is prolonged.

In order to solve the above problem, the present invention provides a battery protection circuit, which is characterized in that the battery protection circuit has a voltage output port, a voltage detection positive port, a voltage detection negative port, and a ground port, and the battery protection circuit includes:

a battery cell having a positive electrode and a negative electrode;

at least one battery protection chip having a logic control output port, a signal input port and a signal output port, wherein the signal input port is electrically connected with the positive electrode of the battery electric core, and the signal output port is electrically connected with the negative electrode of the battery electric core;

the voltage detection circuit comprises a voltage detection positive electrode port, a positive electrode leading-out link and a logic control output port, wherein one end of the positive electrode leading-out link is electrically connected with the positive electrode of the battery electric core, the other end of the positive electrode leading-out link is electrically connected with the voltage detection positive electrode port, the positive electrode leading-out link comprises at least one switch unit, and the switch unit is electrically connected with the logic control output port;

and one end of the negative electrode leading-out link is electrically connected with the negative electrode of the battery cell, and the other end of the negative electrode leading-out link is electrically connected with the voltage detection negative electrode port.

Further preferably, the positive lead-out link includes a first protection resistor, and the first protection resistor is connected in series with the switching unit.

Further preferably, the battery protection circuit further includes at least one overcharge protection unit, and each overcharge protection unit has a corresponding battery protection chip.

Preferably, the overcharge protection unit has a voltage signal input port, a logic control input port and a voltage signal output port, the voltage signal input port is electrically connected to the positive electrode of the battery electric core, the logic control input port is electrically connected to the logic control output port of the battery protection chip corresponding to the overcharge protection unit, and the voltage signal output port is electrically connected to the voltage output port of the battery protection circuit.

Further preferably, when there are a plurality of overcharge protection units, the plurality of overcharge protection units are connected in series.

Further preferably, the battery protection chip has a low-voltage turn-off voltage, and when the voltage of the battery electric core is lower than the low-voltage turn-off voltage, the battery protection chip outputs an invalid enable signal to enable the positive lead-out link to be in an open circuit state.

Further preferably, the disable enable signal is further configured to enable the internal portion of the overcharge protection unit to be in an open circuit state.

Further preferably, the negative outgoing link comprises a second protection resistor, and the resistance value of the second protection resistor is one of 500 ohms and 1000 ohms.

Further preferably, the number of the battery protection chips is two.

In another aspect, the present invention further provides a mobile terminal, where the mobile terminal includes any one of the above battery protection circuits.

The invention has the beneficial effects that: the invention provides a battery protection circuit, which is provided with a voltage output port, a voltage detection anode port, a voltage detection cathode port and a grounding port, and also comprises: a battery cell having a positive electrode and a negative electrode; the battery protection chip is provided with a logic control output port, a signal input port and a signal output port, the signal input port is electrically connected with the anode of the battery cell, and the signal output port is electrically connected with the cathode of the battery cell; the voltage detection circuit comprises a positive electrode leading-out link, a logic control output port and a logic control output port, wherein one end of the positive electrode leading-out link is electrically connected with a positive electrode, the other end of the positive electrode leading-out link is electrically connected with the voltage detection positive electrode port, the positive electrode leading-out link comprises at least one switch unit, and the switch unit is electrically connected with the logic control output; the battery protection circuit provided by the invention can realize that when the battery protection circuit is in a charging state, the voltage of the battery cell is directly detected without other circuit components when the voltage of the battery cell is detected by introducing the anode leading-out link and the cathode leading-out link, thereby avoiding the problem that the measured voltage of the battery cell is too large to enter a constant voltage charging stage too early due to the influence of the voltage drop of a device in the battery protection circuit and the charging time is increased.

Drawings

In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments according to the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without inventive effort.

Fig. 1 is a schematic structural diagram of a battery protection circuit according to a first embodiment of the present invention.

Fig. 2 is a detailed schematic diagram of a battery protection circuit according to a first embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a battery protection circuit according to a second embodiment of the present invention.

Fig. 4 is a detailed schematic diagram of a battery protection circuit according to a second embodiment of the present invention.

Fig. 5 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

Aiming at the problem that in the existing battery protection circuit of the mobile terminal, the voltage of a battery cell detected by the mobile terminal is larger than the actual voltage due to the influence of voltage drop of devices in the battery protection circuit in the process of charging the mobile terminal, so that the mobile terminal enters a constant voltage charging stage too early and the charging time of the mobile terminal is prolonged, the embodiment of the invention is used for solving the problem.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a battery protection circuit according to a first embodiment of the present invention, in which components and relative positions of the components can be visually seen.

As shown in fig. 1, the battery protection circuit 100 has a voltage output port 1, a voltage detection positive port 2, a voltage detection negative port 3, and a ground port 4, and further, the battery protection circuit 100 specifically includes:

a battery cell 110 having a positive electrode (+) and a negative electrode (-);

the battery protection chip 120 is provided with a logic control output port 5, a signal input port 6 and a signal output port 7, wherein the signal input port 6 is electrically connected with the positive pole (+) of the battery electric core 110, and the signal output port 7 is electrically connected with the negative pole (-) of the battery electric core 110;

a positive electrode leading-out link 130, wherein one end of the positive electrode leading-out link 130 is electrically connected with the positive electrode (+) of the battery electric core 110, and the other end is electrically connected with the voltage detection positive electrode port 2, and the positive electrode leading-out link 130 comprises a switch unit 131, and the switch unit 131 is electrically connected with the logic control output port 5;

and a negative lead-out link 140, one end of the negative lead-out link 140 being electrically connected to the negative (-) of the battery cell 110, and the other end being electrically connected to the voltage detection negative port 3.

It is easy to understand that, in the embodiment, by introducing the positive lead-out link 130 and the negative lead-out link 130, when the battery protection circuit 100 is in the charging state, and when the voltage of the battery electric core 110 is detected through the voltage detection positive port 2 and the voltage detection negative port 3, the voltage of the battery electric core 110 can be directly detected without passing through components in the battery protection circuit 100, so that the problem that the measured voltage of the battery electric core 100 is too large due to the influence of the voltage drop of the device in the battery protection circuit 100, so that the measured voltage of the battery electric core 100 enters the constant voltage charging stage too early, and the charging time is increased is solved.

Further, referring to fig. 1, the battery protection circuit 100 further includes an overcharge protection unit 150, wherein:

the overcharge protection unit 150 has a voltage signal input port 8, a logic control input port 9, and a voltage signal output port 10, the voltage signal input port 8 is electrically connected to the positive pole (+) of the battery cell 110, the logic control input port 9 is electrically connected to the logic control output port 5 of the battery protection chip 120 corresponding to the overcharge protection unit 150, and the voltage signal output port 10 is electrically connected to the voltage output port 1 of the battery protection circuit 100.

It should be noted that, the battery protection chip 120 has a low voltage turn-off voltage, when the voltage of the battery electric core 110 is lower than the low voltage turn-off voltage, the battery protection chip 120 generates an invalid enable signal through its internal logic operation, and the invalid enable signal is output to the overcharge protection unit 150 and the switch unit 131 in the positive lead-out link 130 through the logic control output port 5 of the battery protection chip 120, so that the inside of the overcharge protection unit 150 and the positive lead-out link 130 are in an open circuit state, thereby achieving (1) overcharge protection; (2) the battery cell 110 is prevented from being discharged continuously through the positive lead-out link 130 after the battery protection circuit 100 is in the overcharge protection state, so that the problem that the battery cell 110 is over-discharged occurs, and the two purposes are solved.

Further, referring to fig. 2, fig. 2 is a detailed structure diagram of a battery protection circuit according to a first embodiment of the present invention, as shown in fig. 2:

the positive lead-out link 130 comprises a first protection resistor R1, the first protection resistor R1 is connected in series with the switch unit 131, and in this embodiment, the switch unit 131 is composed of an NMOS transistor Q1, and the gate of the NMOS transistor Q1 is electrically connected to the logic control output port 5 of the battery protection chip 120 to access the logic signal output by the battery protection chip 120;

the negative lead-out link 140 includes a second protection resistor R2, wherein the first protection resistor R1 and the second protection resistor R2 have one of 500 ohms and 1000 ohms.

Further, referring to fig. 2, in the present embodiment, the overcharge protection unit 150 is composed of an NMOS transistor Q2 and an NMOS transistor Q3, the NMOS transistor Q2 and the NMOS transistor Q3 are connected in series, and gates of the NMOS transistor Q2 and the NMOS transistor Q3 are electrically connected to the logic control output port 5 of the battery protection chip 120 to access the logic signal output by the battery protection chip 120.

In this embodiment, the enable logic of the overcharge protection unit 150 and the switch unit 131 are the same, so that when the battery protection chip 120 outputs an invalid enable signal through the logic control output port 5, the overcharge protection unit 150 and the switch unit 131 can be turned off at the same time.

Different from the prior art, the present invention provides a battery protection circuit 100, which has a voltage output port 1, a voltage detection positive port 2, a voltage detection negative port 3, and a ground port 4, wherein the battery protection circuit 100 includes: a battery cell 110 having a positive electrode (+) and a negative electrode (-); a battery protection chip 120 having a logic control output port 5, a signal input port 6 and a signal output port 7, wherein the signal input port 6 is electrically connected to the positive pole (+) of the battery electric core 110, and the signal output port 7 is electrically connected to the negative pole (-) of the battery electric core 110; a positive electrode leading-out link 130, wherein one end of the positive electrode leading-out link 130 is electrically connected with the positive electrode (+) of the battery electric core 110, and the other end is electrically connected with the voltage detection positive electrode port 2, and the positive electrode leading-out link 130 comprises a switch unit 131, and the switch unit 131 is electrically connected with the logic control output port 5; the negative lead-out link 140 has one end of the negative lead-out link 140 electrically connected to the negative (-) of the battery electric core 110 and the other end electrically connected to the voltage detection negative port 3, and the battery protection circuit 100 provided by the present invention can directly detect the voltage of the battery electric core 110 without passing through a component in the battery protection circuit 100 when detecting the voltage of the battery electric core 110 when the battery protection circuit 100 is in a charging state by introducing the positive lead-out link 130 and the negative lead-out link 140, so as to avoid the problem that the measured voltage of the battery electric core 100 is too large due to the influence of the voltage drop of the device in the battery protection circuit 100 to enter a constant voltage charging stage too early, which increases the charging time, and meanwhile, due to introducing the switch unit 131 to the positive lead-out link 130, the battery electric core 110 can be prevented from being over-discharged.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a battery protection circuit according to a second embodiment of the present invention, in which components and relative positions of the components can be visually seen.

As shown in fig. 3, the battery protection circuit 200 has a voltage output port 1, a voltage detection positive port 2, a voltage detection negative port 3, and a ground port 4, and further, the battery protection circuit 200 specifically includes:

a battery cell 210 having a positive electrode (+) and a negative electrode (-);

two battery protection chips (battery protection chip 220 and battery protection chip 220'), wherein the battery protection chip 220 has a logic control output port 5, a signal input port 6 and a signal output port 7, the signal input port 6 is electrically connected with the positive pole (+) of the battery electric core 210, and the signal output port 7 is electrically connected with the negative pole (-) of the battery electric core 210; the battery protection chip 220 'has a logic control output port 5', a signal input port 6 'and a signal output port 7', the signal input port 6 'is electrically connected with the positive pole (+) of the battery electric core 210 through the overcharge protection unit 250, and the signal output port 7' is electrically connected with the negative pole (-) of the battery electric core 210;

a positive electrode leading-out link 230, one end of the positive electrode leading-out link 230 is electrically connected with the positive electrode (+) of the battery electric core 210, and the other end is electrically connected with the voltage detection positive electrode port 2, and the positive electrode leading-out link 230 includes two switch units (a switch unit 231 and a switch unit 231 '), wherein the switch unit 231 is electrically connected with the logic control output port 5 of the battery protection chip 220, the switch unit 231 ' is electrically connected with the logic control output port 5 ' of the battery protection chip 220 ', and wherein the switch unit 231 and the switch unit 231 ' are connected in series;

and a negative electrode lead-out link 240, one end of the negative electrode lead-out link 240 being electrically connected to the negative electrode (-) of the battery cell 210, and the other end being electrically connected to the voltage detection negative electrode port 3.

It is easy to understand that, in the present embodiment, by introducing the positive lead-out link 230 and the negative lead-out link 230, when the battery protection circuit 200 is in the charging state, and when the voltage of the battery cell 210 is detected through the voltage detection positive port 2 and the voltage detection negative port 3, the voltage of the battery cell 210 can be directly detected without passing through components in the battery protection circuit 200, so that the problem that the measured voltage of the battery cell 200 is too large due to the influence of the device voltage drop in the battery protection circuit 200, and the measured voltage enters the constant voltage charging stage too early, and the charging time is increased, is avoided.

Further, with reference to fig. 3, the battery protection circuit 200 further includes two overcharge protection units (the overcharge protection unit 250 and the overcharge protection unit 250'), wherein:

the overcharge protection unit 250 has a voltage signal input port 8, a logic control input port 9 and a voltage signal output port 10, the voltage signal input port 8 is electrically connected with the positive pole (+) of the battery cell 210, the logic control input port 9 is electrically connected with the logic control output port 5 of the battery protection chip 220 corresponding to the overcharge protection unit 250, and the voltage signal output port 10 is electrically connected with the voltage output port 1 of the battery protection circuit 200 through the overcharge protection unit 250';

the overcharge protection unit 250 ' has a voltage signal input port 8 ', a logic control input port 9 ', and a voltage signal output port 10 ', the voltage signal input port 8 ' is electrically connected to the positive pole (+) of the battery cell 210 through the overcharge protection unit 250, the logic control input port 9 ' is electrically connected to the logic control output port 5 ' of the battery protection chip 220 ' corresponding to the overcharge protection unit 250 ', and the voltage signal output port 10 ' is electrically connected to the voltage output port 1 of the battery protection circuit 200, and wherein the overcharge protection unit 250 and the overcharge protection unit 250 ' are connected in series.

It should be noted that, the battery protection chip 220 and the battery protection chip 220 'respectively have a low voltage turn-off voltage (V1 and V1', wherein V1 and V1 'may be equal or unequal), when the voltage of the battery cell 210 is lower than the low voltage turn-off voltage (V1 and/or V1'), the battery protection chip 220 (and/or the battery protection chip 220 ') generates an invalid enable signal through its internal logic operation, and the invalid enable signal is output to the overcharge protection unit 250 (and/or the overcharge protection unit 250') and the switch unit 231 (and/or the switch unit 231 ') in the positive lead-out link 230 through the logic control output port 5 (and/or the logic control output port 5') of the battery protection chip 220 (and/or the battery protection chip 220 '), so that the internal of the overcharge protection unit 250 (and/or the positive lead-out link 250') and the positive lead-out link 130 are in an open circuit state State, thereby achieving (1) overcharge protection; (2) the battery cell 210 is prevented from being discharged continuously through the positive lead-out link 230 after the battery protection circuit 200 is in the overcharge protection state, so that the problem that the battery cell 210 is over-discharged occurs, and the two purposes are solved.

It should be further noted that, in this embodiment, two overcharge protection units are provided to enable the battery protection circuit 200 to have the dual overcharge protection effect, and when one overcharge protection unit in the battery protection circuit 200 fails or the precision value of one overcharge protection unit is not correct, the overcharge protection of the battery protection circuit 200 is not affected.

Further, referring to fig. 4, fig. 4 is a detailed structure diagram of a battery protection circuit according to a second embodiment of the present invention, as shown in fig. 4:

the positive lead-out link 230 includes a first protection resistor R1, the first protection resistor R1 is connected in series with the switch unit 231 and the switch unit 231 ', and in this embodiment, the switch unit 231 is composed of an NMOS transistor Q1, the switch unit 231 ' is composed of an NMOS transistor Q1 ', a gate of the NMOS transistor Q1 is electrically connected to the logic control output port 5 of the battery protection chip 220 to access the logic signal output by the battery protection chip 220, and a gate of the NMOS transistor Q1 ' is electrically connected to the logic control output port 5 ' of the battery protection chip 220 ' to access the logic signal output by the battery protection chip 220 ';

the cathode outgoing link 240 includes a second protection resistor R2, wherein the first protection resistor R1 and the second protection resistor R2 have one of 500 ohms and 1000 ohms.

Further, with reference to fig. 4, in the present embodiment, the overcharge protection unit 250 is composed of an NMOS transistor Q2 and an NMOS transistor Q3, the NMOS transistor Q2 and the NMOS transistor Q3 are connected in series, and gates of the NMOS transistor Q2 and the NMOS transistor Q3 are electrically connected to the logic control output port 5 of the battery protection chip 220 to access the logic signal output by the battery protection chip 220; the overcharge protection unit 250 'is composed of an NMOS transistor Q2' and an NMOS transistor Q3 ', the NMOS transistor Q2' and the NMOS transistor Q3 'are connected in series, and gates of the NMOS transistor Q2' and the NMOS transistor Q3 'are electrically connected to the logic control output port 5' of the battery protection chip 220 'to access the logic signal output by the battery protection chip 220'.

In the embodiment, the enabling logics of the overcharge protection unit 250 and the switch unit 231 are the same, and the enabling logics of the overcharge protection unit 250 'and the switch unit 231' are the same, so that when the battery protection chip 220 outputs an invalid enabling signal through the logic control output port 5 thereof, the overcharge protection unit 250 and the switch unit 231 can be turned off at the same time, and when the battery protection chip 220 'outputs an invalid enabling signal through the logic control output port 5' thereof, the overcharge protection unit 250 'and the switch unit 231' can be turned off at the same time.

It should be noted that, in some modifications obtained by the second embodiment according to the present invention, in order to reduce the design cost, only one switch unit (i.e. the battery protection circuit 200 has the switch unit 231 or the switch unit 231') is designed to achieve the beneficial effects of the present invention; in addition, in some other modifications obtained according to the second embodiment of the present invention, the switch unit may be designed on the negative lead link 240, and at this time, a logic control circuit is additionally connected to the switch unit to achieve the beneficial effects of the present invention, which is not described herein again.

Different from the prior art, the present invention provides a battery protection circuit 200, which has a voltage output port 1, a voltage detection positive port 2, a voltage detection negative port 3, and a ground port 4, and further, the battery protection circuit 200 specifically includes: a battery cell 210 having a positive electrode (+) and a negative electrode (-); two battery protection chips (battery protection chip 220 and battery protection chip 220'), wherein the battery protection chip 220 has a logic control output port 5, a signal input port 6 and a signal output port 7, the signal input port 6 is electrically connected with the positive pole (+) of the battery electric core 210, and the signal output port 7 is electrically connected with the negative pole (-) of the battery electric core 210; the battery protection chip 220 'has a logic control output port 5', a signal input port 6 'and a signal output port 7', the signal input port 6 'is electrically connected with the positive pole (+) of the battery electric core 210 through the overcharge protection unit 250, and the signal output port 7' is electrically connected with the negative pole (-) of the battery electric core 210; the positive electrode leading-out link 230, one end of the positive electrode leading-out link 230 is electrically connected with the positive electrode (+) of the battery electric core 210, and the other end of the positive electrode leading-out link 230 is electrically connected with the voltage detection positive electrode port 2, and the positive electrode leading-out link 230 includes two switch units (a switch unit 231 and a switch unit 231 '), wherein the switch unit 231 is electrically connected with the logic control output port 5 of the battery protection chip 220, and the switch unit 231' is electrically connected with the logic control output port 5 'of the battery protection chip 220'; one end of the negative lead-out link 240 is electrically connected with the negative (-) of the battery cell 210, and the other end is electrically connected with the voltage detection negative port 3, the battery protection circuit 200 provided by the invention is characterized in that by introducing the positive lead-out link 230 and the negative lead-out link 240, it is possible to realize that, when the voltage of the battery cell 210 is detected while the battery protection circuit 200 is in the charging state, the voltage of the battery cell 210 is directly detected without passing through components in the battery protection circuit 200, thereby avoiding the problem that the measured voltage of the battery cell 200 is too large to enter the constant voltage charging stage too early due to the influence of the voltage drop of the device in the battery protection circuit 200, and the charging time is increased, and simultaneously, since the switching unit 231 and the switching unit 231' are introduced on the positive lead-out link 230, the battery cells 210 can be prevented from being over-discharged.

Referring to fig. 5, fig. 5 is a detailed structure schematic diagram of a mobile terminal according to an embodiment of the present invention, where the mobile terminal may be a smart phone or a tablet computer, and components and relative positions of the components of the present invention can be visually seen from the diagram.

Fig. 5 is a block diagram illustrating a specific structure of the mobile terminal 100 according to an embodiment of the present invention. As shown in fig. 5, the mobile terminal 100 may include Radio Frequency (RF) circuitry 110, memory 120 including one or more computer-readable storage media, an input unit 130, a display unit 140, a sensor 150, audio circuitry 160, a transmission module 170 (e.g., Wireless Fidelity (WiFi), a Wireless Fidelity (wi-fi)), a processor 180 including one or more processing cores, and a power supply 190. Those skilled in the art will appreciate that the mobile terminal architecture shown in fig. 5 is not intended to be limiting of mobile terminals and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.

The RF circuit 110 is used for receiving and transmitting electromagnetic waves, and performs interconversion between the electromagnetic waves and electrical signals, so as to communicate with a communication network or other devices. The RF circuitry 110 may include various existing circuit components for performing these functions, such as antennas, radio frequency transceivers, digital signal processors, encryption/decryption chips, Subscriber Identity Module (SIM) cards, memory, and so forth. The RF circuitry 110 may communicate with various networks such as the internet, an intranet, a wireless network, or with other devices over a wireless network.

The wireless network may comprise a cellular telephone network, a wireless local area network, or a metropolitan area network.

The Wireless network may use various Communication standards, protocols and technologies, including but not limited to Global System for Mobile Communication (GSM), Enhanced Data GSM Environment (EDGE), Wideband Code Division Multiple Access (WCDMA), Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Wireless Fidelity (Wi-Fi) (e.g., IEEE802.11 a, IEEE 2.11b, IEEE 2.11g and/or IEEE802.11 n standards for electrical and electronic engineers), Voice over Internet Protocol (VoIP), world wide mail Access (wimax), other suitable short message protocols, and may even include those protocols that have not yet been developed.

The memory 120 may be configured to store software programs and modules, such as corresponding program instructions in the above audio power amplifier control method, and the processor 180 executes various functional applications and data processing by operating the software programs and modules stored in the memory 120, that is, obtains the frequency of the information transmission signal transmitted by the mobile terminal 100. Generating interference signals, and the like. Memory 120 may include high speed random access memory and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 120 may further include memory located remotely from the processor 180, which may be connected to the mobile terminal 100 through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

The input unit 130 may be used to receive input numeric or character information and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function control. In particular, the input unit 130 may include a touch-sensitive surface 131 as well as other input devices 132. The touch-sensitive surface 131, also referred to as a touch display screen or a touch pad, may collect touch operations by a user on or near the touch-sensitive surface 131 (e.g., operations by a user on or near the touch-sensitive surface 131 using a finger, a stylus, or any other suitable object or attachment), and drive the corresponding connection device according to a predetermined program. Alternatively, the touch sensitive surface 131 may comprise two parts, a touch detection means and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 180, and can receive and execute commands sent by the processor 180. Additionally, the touch-sensitive surface 131 may be implemented using various types of resistive, capacitive, infrared, and surface acoustic waves. In addition to the touch-sensitive surface 131, the input unit 130 may also include other input devices 132. In particular, other input devices 132 may include, but are not limited to, one or more of a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, a joystick, and the like.

The display unit 140 may be used to display information input by or provided to a user and various graphic user interfaces of the mobile terminal 100, which may be configured by graphics, text, icons, video, and any combination thereof. The Display unit 140 may include a Display panel 141, and optionally, the Display panel 141 may be configured in the form of an LCD (Liquid Crystal Display), an OLED (Organic Light-Emitting Diode), or the like. Further, the touch-sensitive surface 131 may cover the display panel 141, and when a touch operation is detected on or near the touch-sensitive surface 131, the touch operation is transmitted to the processor 180 to determine the type of the touch event, and then the processor 180 provides a corresponding visual output on the display panel 141 according to the type of the touch event. Although in the figures touch-sensitive surface 131 and display panel 141 are shown as two separate components to implement input and output functions, in some embodiments touch-sensitive surface 131 may be integrated with display panel 141 to implement input and output functions.

The mobile terminal 100 may also include at least one sensor 150, such as a light sensor, a motion sensor, and other sensors. Specifically, the light sensor may include an ambient light sensor that may adjust the brightness of the display panel 141 according to the brightness of ambient light, and a proximity sensor that may generate an interrupt when the folder is closed or closed. As one of the motion sensors, the gravity acceleration sensor can detect the magnitude of acceleration in each direction (generally, three axes), can detect the magnitude and direction of gravity when the mobile phone is stationary, and can be used for applications of recognizing the posture of the mobile phone (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration recognition related functions (such as pedometer and tapping), and the like; as for other sensors such as a gyroscope, a barometer, a hygrometer, a thermometer, and an infrared sensor, which may be further configured in the mobile terminal 100, detailed descriptions thereof are omitted.

Audio circuitry 160, speaker 161, and microphone 162 may provide an audio interface between a user and mobile terminal 100. The audio circuit 160 may transmit the electrical signal converted from the received audio data to the speaker 161, and convert the electrical signal into a sound signal for output by the speaker 161; on the other hand, the microphone 162 converts the collected sound signal into an electric signal, converts the electric signal into audio data after being received by the audio circuit 160, and then outputs the audio data to the processor 180 for processing, and then to the RF circuit 110 to be transmitted to, for example, another terminal, or outputs the audio data to the memory 120 for further processing. The audio circuit 160 may also include an earbud jack to provide communication of a peripheral headset with the mobile terminal 100.

The mobile terminal 100, which can assist the user in receiving requests, transmitting information, etc., through the transmission module 170 (e.g., Wi-Fi module), provides the user with wireless broadband internet access. Although the transmission module 170 is shown in the drawings, it is understood that it does not belong to the essential constitution of the mobile terminal 100 and may be omitted entirely as needed within the scope not changing the essence of the invention.

The processor 180 is a control center of the mobile terminal 100, connects various parts of the entire mobile phone using various interfaces and lines, and performs various functions of the mobile terminal 100 and processes data by operating or executing software programs and/or modules stored in the memory 120 and calling data stored in the memory 120, thereby integrally monitoring the mobile terminal. Optionally, processor 180 may include one or more processing cores; in some embodiments, the processor 180 may integrate an application processor, which primarily handles operating systems, user interfaces, applications, etc., and a modem processor, which primarily handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 180.

The mobile terminal 100 may also include a power supply 190 (e.g., a battery) for powering the various components, which may be logically coupled to the processor 180 via a power management system that may be used to manage charging, discharging, and power consumption management functions in some embodiments. The power supply 190 may also include any component including one or more of a dc or ac power source, a recharging system, a power failure detection circuit, a power converter or inverter, a power status indicator, and the like.

Although not shown, the mobile terminal 100 further includes a camera (e.g., a front camera, a rear camera, etc.), a bluetooth module, a flashlight, etc., which will not be described herein.

In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by using equivalents or equivalent substitutions fall within the protection scope of the claims of the present invention.

In summary, although the preferred embodiments of the present invention have been described above, the above-described preferred embodiments are not intended to limit the present invention, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, therefore, the scope of the present invention shall be determined by the appended claims.

Claims

1. A battery protection circuit having a voltage output port, a voltage detection positive port, a voltage detection negative port, and a ground port, the battery protection circuit comprising:

a battery cell having a positive electrode and a negative electrode;

2. The battery protection circuit of claim 1, wherein the positive lead-out link comprises a first protection resistor connected in series with the switching unit.

3. The battery protection circuit of claim 1, further comprising at least one overcharge protection unit, each overcharge protection unit having a corresponding battery protection chip.

4. The battery protection circuit of claim 3, wherein the overcharge protection unit has a voltage signal input port, a logic control input port, and a voltage signal output port, the voltage signal input port is electrically connected to the positive electrode of the battery cell, the logic control input port is electrically connected to the logic control output port of the battery protection chip corresponding to the overcharge protection unit, and the voltage signal output port is electrically connected to the voltage output port of the battery protection circuit.

5. The battery protection circuit according to claim 3, wherein when the overcharge protection unit is plural, the plural overcharge protection units are connected in series.

6. The battery protection circuit of claim 3, wherein the battery protection chip has a low voltage turn-off voltage, and when the voltage of the battery cell is lower than the low voltage turn-off voltage, the battery protection chip outputs an invalid enable signal to enable the positive outgoing link to be in an open circuit state.

7. The battery protection circuit of claim 6, wherein the disable enable signal is further configured to place an interior of the overcharge protection unit in an open circuit state.

8. The battery protection circuit of claim 1, wherein the negative lead link comprises a second protection resistor having a resistance of one of 500 ohms and 1000 ohms.

9. The battery protection circuit of claim 1, wherein the number of battery protection chips is two.

10. A mobile terminal, characterized in that it comprises a battery protection circuit according to any of claims 1-9.