CN115566745A

CN115566745A - Charging and discharging protection system and method and electronic equipment

Info

Publication number: CN115566745A
Application number: CN202110749864.3A
Authority: CN
Inventors: 高思佳; 席利根
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2021-07-01
Filing date: 2021-07-01
Publication date: 2023-01-03

Abstract

The disclosure relates to a charging and discharging protection system, a method and an electronic device, wherein the charging and discharging protection system comprises: the charging and discharging circuit comprises a first battery cell and a second battery cell which are connected in series, wherein the positive electrode of the second battery cell is connected with the positive electrode port, and the negative electrode of the first battery cell is connected with the negative electrode port; the first protection chip is respectively connected with the first battery cell and the second battery cell; the switch circuit is arranged between the first battery cell and the negative electrode port; the first protection chip is used for controlling the switch circuit to be connected or disconnected; when the voltage of the first battery cell or the second battery cell reaches a voltage threshold, the switching circuit is used for being disconnected under the control of the first protection chip so as to disconnect the charging and discharging circuit. After the secondary protection action in the disclosure, under the action of the first protection chip, the switching circuit can be controlled to be connected again after the abnormity is removed. The protection function can be repeatedly operated.

Description

Charging and discharging protection system and method and electronic equipment

Technical Field

The present disclosure relates to the field of electronic devices, and in particular, to a charging and discharging protection system and method, and an electronic device.

Background

To meet the energy consumption demand, the battery capacity and charging power of electronic devices such as mobile phones are increasing.

In the related art, a mode of connecting two battery cells in series is usually adopted to increase the charging power. Wherein, the circuit protection scheme when two electric cores are connected in series and are used generally adopts: the secondary protection scheme of the blown fuse, the protection circuit can be completely blown after the secondary protection action, and the protection function can not be recovered.

Disclosure of Invention

In order to overcome the problems in the related art, the present disclosure provides a charging and discharging protection system, a method and an electronic device.

According to a first aspect of the embodiments of the present disclosure, a charging and discharging protection system is provided, including:

the charging and discharging circuit comprises a first battery cell and a second battery cell which are connected in series, wherein the positive electrode of the second battery cell is connected with the positive electrode port, and the negative electrode of the first battery cell is connected with the negative electrode port;

the first protection chip is respectively connected with the first battery cell and the second battery cell;

the switch circuit is arranged between the first battery cell and the negative electrode port;

the first protection chip is used for controlling the switch circuit to be connected or disconnected; when the voltage of the first battery cell or the second battery cell reaches a voltage threshold, the switching circuit is used for being disconnected under the control of the first protection chip so as to disconnect the charging and discharging circuit.

In some embodiments, the switching circuit comprises: a first switch and a second switch;

a first end of the first switch is connected with a negative electrode of the first battery cell, a second end of the first switch is connected with a first end of the second switch, and a second end of the second switch is connected with the negative electrode port;

and the third end of the first switch and the third end of the second switch are respectively connected with the anode of the second battery cell.

In some embodiments, the switching circuit further comprises: a control branch;

a first end of the control branch circuit is connected with a negative electrode of the first battery cell, and a second end of the control branch circuit is connected between a third end of the first switch and a positive electrode of the second battery cell; the control branch circuit is used for controlling the first switch to be switched off when the current reaches a preset current threshold value.

In some embodiments, the control branch routes from the first end to the second end are sequentially provided with: a grounding branch and a first control switch;

the grounding branch comprises: one end of the first resistor is connected with the first end of the first control switch, the other end of the first resistor is connected with one end of the second resistor, and the other end of the second resistor is connected with the ground;

the second end of the first control switch is connected between the first resistor and the second resistor, and the third end of the first control switch is connected with the anode of the second battery cell.

In some embodiments, the switching circuit further comprises: a third resistor;

and the third end of the first switch and the third end of the first control switch are both connected with the anode of the second battery cell through a third resistor.

In some embodiments, the switching circuit further comprises: a second control switch;

a first end of the second control switch is connected with a third end of the second switch, a second end of the second control switch is connected with a second end of the second switch, and a third end of the second control switch is connected with the first protection chip;

the first protection chip controls the connection or disconnection of the second switch through the second control switch.

In some embodiments, further comprising: the second protection chip, the third switch and the fourth switch;

a first end of the third switch is connected with the positive electrode of the second battery cell, a second end of the third switch is connected with a first end of the fourth switch, a second end of the fourth switch is connected with the positive electrode port, and a third end of the third switch and a third end of the fourth switch are respectively connected with the second protection chip;

the second protection chip is used for controlling connection or disconnection of the third switch and connection or disconnection of the fourth switch.

In some embodiments, further comprising: a third control switch;

the first end of the third control switch is connected with the second end of the fourth switch, the second end of the third control switch is connected with the third end of the fourth switch, and the third end of the third control switch is grounded.

According to a second aspect of an embodiment of the present disclosure, an electronic device is provided, which includes any one of the charging and discharging protection systems described above.

According to a third aspect of the embodiments of the present disclosure, a protection method for charging and discharging is provided, which is applied to an electronic device, and the method includes:

acquiring a first voltage of a first battery cell and a second voltage of a second battery cell;

issuing a control signal to control a switching circuit to open in response to the first voltage or the second voltage reaching a voltage threshold.

In some embodiments, said issuing a control signal to control the switching circuit to open comprises:

and controlling a preset pin of the first protection chip to output a high level according to the control signal so as to control the connection of a second control switch and the turn-off of a second switch in the switch circuit.

In some embodiments, the method further comprises:

obtaining a current of the first cell or the second cell;

in response to the current reaching a preset current threshold, the first control switch is turned on to turn off the first switch of the switching circuit.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects: in the present disclosure, the charge and discharge circuit can be disconnected by disconnecting the switch circuit, thereby realizing secondary protection of the charge circuit. Under the action of the first protection chip, after the abnormity is relieved, the switching circuit can be controlled to be communicated again. The protection function can repeatedly act, and the problem that the traditional protection scheme can only protect once is solved.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a schematic diagram of a protection circuit in the related art.

Fig. 2 is a circuit diagram illustrating a charging and discharging protection system according to an exemplary embodiment.

FIG. 3 is a flow chart illustrating a method according to an example embodiment.

Fig. 4 is a block diagram illustrating an apparatus according to an example embodiment.

FIG. 5 is a block diagram of an electronic device shown in accordance with an example embodiment.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.

With the development of the technology, the functions of electronic equipment such as a mobile phone are more and more, and the screen occupation ratio is higher and higher. To meet the energy consumption demand, the battery capacity and charging power of electronic devices are also increasing. The larger the charging power is, the larger the charging current is, the higher the temperature rise of a circuit device of the protection circuit and a protection board in the battery is, the larger the stress borne by the circuit device is, and the use safety of the battery is seriously influenced.

In the related art, a mode of connecting two battery cells in series is usually adopted to increase the charging power and reduce the charging current. As shown in fig. 1, a circuit protection scheme when the series battery cell1 'is used generally adopts a secondary protection scheme of blowing a fuse (fuse) 2': after triggering the secondary protection (for example, the current is too large), the chip 3' drives the switch 4' to be opened, so that the fuse (fuse) 2' is short-circuited at two sides of the series-connected battery cell 1' (one end of the fuse 2' is grounded and the other end is connected with the anode of the battery cell1 '), and the fuse (fuse) 2' is blown.

In the related art, the protection circuit is completely blown after the secondary protection action, and the protection function cannot be recovered after the protection action; moreover, the scheme has large protection delay and cannot rapidly switch abnormal circuits.

In an embodiment of the present disclosure, a charge and discharge protection system is provided, including a charge and discharge circuit, including a first electrical core and a second electrical core connected in series, where a positive electrode of the second electrical core is connected to a positive electrode port, and a negative electrode of the first electrical core is connected to a negative electrode port; the first protection chip is respectively connected with the first battery cell and the second battery cell; the switch circuit is arranged between the first battery cell and the negative electrode port; the first protection chip is used for controlling the switching circuit to be connected or disconnected, and when the voltage of the first battery cell or the voltage of the second battery cell reaches a voltage threshold value, the switching circuit is disconnected under the control of the first protection chip so as to disconnect the charging and discharging circuit. In the present disclosure, the charge and discharge circuit can be disconnected by disconnecting the switch circuit, thereby realizing secondary protection of the charge circuit. Under the action of the first protection chip, after the abnormity is relieved, the switching circuit can be controlled to be communicated again. The protection function can repeatedly act, and the problem that the traditional protection scheme can only protect once is solved.

After the electronic device is connected with a charger (such as a wired charger), the wired charger converts alternating current of a power grid into direct current, then the direct current supplies power to a TYPE-C interface of the electronic device, and after the direct current received by the TYPE-C interface is subjected to voltage regulation and filtering by a mainboard charging circuit of the electronic device, the direct current is charged to a battery (which can comprise two battery cells connected in series) of the electronic device through the charging and discharging protection system of the embodiment.

In an exemplary embodiment, as shown in fig. 2, the charging and discharging protection system of the present embodiment includes: a charge and discharge circuit 10, a first protection chip 20 and a switch circuit 30.

The charge and discharge circuit 10 includes a first cell (cell 1) 101 and a second cell (cell 2) 102 connected in series. The positive electrode of the second cell 102 is connected to the positive port (P2 +) 200, and the negative electrode of the first cell 101 is connected to the negative port (P1-) 100. The negative electrode of the second cell 102 is connected to the positive electrode of the first cell 101.

The first protective chip (U1) 20 is connected to the first cell 101 and the second cell 102, respectively. The switch circuit 30 is disposed between the first cell 101 and the negative electrode port 100. The first protection chip 20 is used for controlling the switching circuit 30 to be connected or disconnected; when the voltage of the first battery cell 101 or the second battery cell 102 reaches the voltage threshold, the switch circuit 30 is configured to be turned off under the control of the first protection chip 20 to disconnect the charging and discharging circuit.

In this embodiment, the first protection chip 20 may monitor voltages of the first cell 101 and the second cell 102. The switching circuit 30 may include at least one switching element, and each of the at least one switching element may be connected to the first protective chip 20. The first protection chip 20 controls the on/off of the switching circuit 30 by controlling the on/off of one or more switching elements.

In an exemplary embodiment, as shown in fig. 2, the switching circuit 30 includes: a first switch (Q4) 31 and a second switch (Q3) 32.

A first end of the first switch 31 is connected to a negative electrode of the first battery cell 101, a second end of the first switch 31 is connected to a first end of the second switch 32, and a second end of the second switch 32 is connected to the negative electrode port 100. The third terminal of the first switch 31 and the third terminal of the second switch 32 are respectively connected to the positive electrode (B2 +) of the second cell 102.

In this embodiment, the first switch 31 and the second switch 32 may be, for example, both power N-MOS transistors, and are connected in series in the charge and discharge circuit 10. The first switch 31 is turned off, and the main power charging circuit of the charging and discharging circuit 10 is cut off. When the second switch 32 is turned off, the main power discharge circuit of the charge/discharge circuit 10 is cut off.

In a state where the first switch 31 and the second switch 32 are connected, a charging circuit (a circuit of a charging current) is, for example: a positive port (P2 +) 200, a second cell 102, a first cell 101, a first switch 31, a second switch 32 to a negative port (P1-) 100. The discharge loop (loop of discharge current) is, for example: the positive electrode of the second battery cell 102, the positive electrode port (P2 +) 200, the negative electrode port (P1-) 100, the second switch 32, the first switch 31, and the negative electrodes of the first battery cell 101 to the second battery cell 102.

In this embodiment, the switch circuit 30 controls the switch device to realize circuit protection, and compared with the fuse blowing scheme in the related art, the protection device reacts faster and has faster protection action, and can instantly cut off an abnormal circuit.

In an exemplary embodiment, as shown in fig. 2, the switching circuit 30 further includes: a control branch 33. A first end of the control branch 33 is connected to the negative electrode of the first battery cell 101, and a second end of the control branch 33 is connected between the third end of the first switch 31 and the positive electrode of the second battery cell 102; the control branch 33 is used for controlling the first switch 31 to be opened when the current reaches a preset current threshold.

The control branch 33 may be passively turned on by the trigger signal, and the first switch 31 may be controlled to be turned off after the control branch 33 is turned on. In this embodiment, the trigger signal is that the current reaches a preset current threshold, for example: the current of the charge and discharge circuit 10 (the current of the first cell 101 and the second cell 102) reaches the corresponding short-circuit current threshold value.

In an exemplary embodiment, as shown in fig. 2, the control branch 33 is sequentially provided with, from the first end to the second end: a ground branch 331 and a first control switch (Q7) 332.

The ground branch 331 includes: a first resistor (R17) 3311 and a second resistor (R18) 3312, one end of the first resistor 3311 being connected to the first end of the first control switch 332, the other end of the first resistor 3311 being connected to one end of the second resistor 3312, and the other end of the second resistor 3312 being connected to ground. The second end of the first control switch 332 is connected between the first resistor 3311 and the second resistor 3312, and the third end of the first control switch 332 is connected to the positive electrode of the second electric core 102.

In this embodiment, the first control switch (Q7) 332 may be configured as a signal N-MOS transistor, for example, and is used for controlling the turning-off of the first switch (Q4) 31.

Among them, the first resistor (R17) 3311 and the second resistor (R18) 3312 may be used to: and detecting short-circuit current, controlling connection and disconnection of the first control switch (Q7) 332 according to the current, further controlling connection and disconnection of the first switch (Q4) 31, and realizing connection and disconnection of the charging and discharging circuit 10.

In one example, the first (R17) 3311 and second (R18) resistances 3312 may be configured to: when the current of the charge and discharge circuit 10 reaches the short-circuit current threshold, the first resistor (R17) 3311 divides the voltage to increase and reach the turn-on voltage of the first control switch (Q7) 332, the first control switch (Q7) 332 is turned on, so that the first switch (Q4) 31 is turned off, the charge and discharge circuit 10 is turned off, and the discharge is stopped.

In another example, the first resistance (R17) 3311 and the second resistance (R18) 3312 may be configured to: under normal conditions, if the current of the charge and discharge circuit 10 does not reach the short-circuit current threshold, the first resistor (R17) 3311 has a small voltage division and is lower than the turn-on voltage of the first control switch (Q7) 332, the first control switch (Q7) 332 is in the off state, so that the first switch (Q4) 31 is in the on state, the charge and discharge circuit 10 is in the on state, and normal discharge can be realized.

It can be understood that, with reference to fig. 2 and the following embodiments, the present embodiment further includes a sampling resistor RS1 and a second protection chip (U2) 40, the sampling resistor RS1 is disposed between the first battery cell 101 and the control branch 33, and two ends of the sampling resistor RS1 are respectively connected to the RSP pin and the RSN pin of the second protection chip 40, so that the second protection chip 40 can determine the currents of the two battery cells in the circuit by knowing the currents of the RS 1.

With reference to fig. 2, in this embodiment, the control of the first switch (Q4) 31 can be realized through the control branch 33, so that when secondary protection is required, the first switch 31 is turned off, the charging and discharging circuit 10 is further turned off, discharging is stopped (over-discharge is prevented), and secondary protection in the charging and discharging process is realized.

In an exemplary embodiment, as shown in fig. 2, the switching circuit 30 further includes: and a third resistor (R16) 34. The third terminal of the first switch 31 and the third terminal of the first control switch 332 are both connected to the positive electrode (B2 +) of the second cell 102 through the third resistor 34. In connection with the above-described embodiment, the first resistor (R17) 3311 and the second resistor (R18) 3312 are connected in series and then connected in parallel across the first switch (Q4) 31 and the second switch (Q3) 32. The third terminal of the first switch 31 is, for example, a gate or a grid of a MOS transistor (a control electrode of the MOS transistor), and the gate of the first switch 31 is connected to the third resistor 34.

In this embodiment, in a conventional scenario, due to the setting of the third resistor 34, the gate voltage of the first switch 31 should be greater than zero, such as within a suitable voltage range. When a short circuit occurs (the current reaches a short-circuit current threshold), the current flowing through the first switch (Q4) 31 and the second switch (Q3) 32 suddenly increases, the voltage across the first switch (Q4) 31 and the second switch (Q3) 32 also suddenly increases, the voltage divided by the first resistor (R17) 3311 suddenly increases and reaches the turn-on voltage of the first control switch (Q7) 332, the first control switch (Q7) 332 is turned on, so that the gate voltage of the first switch (Q4) 31 is reduced to zero, the first switch (Q4) 31 is turned off, and the discharging process of the charging and discharging circuit 10 is cut off. And realizing the short-circuit protection function.

In an exemplary embodiment, as shown in fig. 2, the switching circuit 30 further includes: and a second control switch (Q6) 35.

A first terminal of the second control switch 35 is connected to a third terminal of the second switch 32, a second terminal of the second control switch 35 is connected to a second terminal of the second switch 32, and a third terminal of the second control switch 35 is connected to the first protection chip 20; the first protection chip 20 controls the connection or disconnection of the second switch 32 through the second control switch 35.

In this embodiment, the second control switch 35 is, for example, a signal N-MOS transistor, and a third terminal of the second control switch 35 is, for example, connected to the OUT pin of the first protection chip 20. The first protection chip 20 is used for controlling the turn-off of the second switch (Q3) 32, for example, the first protection chip 20 outputs a high-low level signal through an OUT pin to control the connection or disconnection of the second control switch 35, so as to control the connection or disconnection of the second switch 32.

In one example, the first protection chip 20 may obtain voltages of the first cell 101 and the second cell 102, and perform the normal charging when both voltages do not reach the overcharge voltage threshold. In a normal charging scene, the OUT pin of the first protection chip 20 outputs a low level, the second control switch (Q6) is in an off state, the second switch (Q3) 32 is in a connected state, and the charging and discharging circuit 10 is connected to realize a normal charging process.

In another example, when the voltage of any cell reaches an overcharge voltage threshold, secondary protection is required. The OUT pin of the first protection chip 20 outputs a high level to control the second control switch (Q6) to be connected, so as to control the second switch (Q3) 32 to be turned off (the third terminal G and the second terminal S of the second switch 32 are grounded and turned off), thereby disconnecting the charging and discharging circuit 10 and cutting off the main power charging process.

It can be understood that the control electrodes of the MOS transistors are gates or gates (G-electrodes), in the switch in each MOS transistor form according to the above embodiment, the electrode for implementing the corresponding control function is a gate, and the defined "first end", "second end" and "third end" are only used for distinguishing different electrodes of the MOS transistor, and are not limited to specific categories. For example, the third terminal of the first switch 31 is a gate, the third terminal of the second switch 32 is a gate, the second terminal of the first control switch 332 is a gate, and the third terminal of the second control switch 35 is a gate.

In an exemplary embodiment, as shown in fig. 2, the protection device of the present embodiment further includes: a second protection chip (U2) 40, a third switch (Q1) 50, and a fourth switch (Q2) 60.

A first end of the third switch 50 is connected to the positive electrode of the second battery cell 102, a second end of the third switch 50 is connected to a first end of the fourth switch 60, a second end of the fourth switch 60 is connected to the positive electrode port 200, and a third end of the third switch 50 and a third end of the fourth switch 60 are respectively connected to the second protection chip 40; the second protection chip 40 is used to control the connection or disconnection of the third switch 50 and the connection or disconnection of the fourth switch 60.

In this embodiment, the third switch (Q1) 50 and the fourth switch (Q2) 60 may be configured as a power N-MOS transistor, for example. The third terminal of the third switch 50 may be connected to the CHG pin of the second protection chip 40, such as: the third switch 50 is connected to the CHG pin through a resistor R6. The third terminal of the fourth switch 60 is connected to a DSG pin of the second protection chip 40, such as: the fourth switch 60 is connected to the DSG pin through a resistor R7.

In conjunction with fig. 2 and the foregoing embodiments, it can be seen that:

the first switch (Q4) 31, the second switch (Q3) 32, the third switch (Q1) 50, and the fourth switch (Q2) 60 are all power N-MOS, and are connected in series with two battery cells in the charging and discharging circuit 10, where if any one of the switches is turned off, the charging and discharging circuit 10 is turned off. Wherein, the third switch (Q1) and the second switch (Q3) 32 can control the on/off of the charging loop, and the fourth switch (Q2) and the first switch (Q4) 31 can control the on/off of the discharging loop.

In one example, for example, in a normal charging and discharging state, the CHG pin and the DSG pin of the second protection chip (U2) 40 both output a high level, the third switch (Q1) 50 and the fourth switch (Q2) 60 are in a conducting state, and the main power charging and discharging circuit 10 is in a connected state.

In another example, the second protection chip (U2) 40 implements primary protection during charging and discharging according to the monitored voltage and current. For example, when the voltage reaches a voltage threshold corresponding to the primary protection, the second protection chip (U2) 40 may control to turn off the third switch (Q1) 50, thereby turning off the charging loop. Alternatively, the second protection chip (U2) 40 controls to turn off the fourth switch (Q2) 60, thereby turning off the discharge circuit.

In an exemplary embodiment, as shown in fig. 2, the protection device of the present embodiment further includes: and a third control switch (Q5) 70. A first terminal of the third control switch 70 is connected to a second terminal of the fourth switch (Q2) 60, a second terminal of the third control switch 70 is connected to a third terminal of the fourth switch 60, and a third terminal of the third control switch 70 is grounded.

In this embodiment, the third control switch 70 can be set as a signal N-MOS transistor, for example. The third terminal of the third control switch 70 is grounded through a resistor R8.

In which the third control switch 70 is set to avoid a reverse charging scenario. When the reverse charging occurs, the third control switch 70 is turned on and the fourth switch (Q2) 60 is turned off. Therefore, the situation that the circuit is burnt out due to the fact that the anode port (P2 +) 200 and the cathode port (P1 +) 100 are reversely connected with the power supply is avoided.

With reference to the circuit shown in fig. 2 and the foregoing embodiments, the charging and discharging protection system in the embodiment of the present disclosure may implement primary protection and secondary protection. The second protection chip (U2) 40 is a primary protection master IC, and the first protection chip (U1) 20 is a secondary protection master IC. The first protection chip (U1) 20 may monitor voltages of the first and second cells 101 and 102, and the second protection chip (U2) 40 may monitor voltages and currents of the first and second cells 101 and 102.

In a first example:

the second protection chip (U2) 40 monitors the voltage, current or temperature in real time. When the threshold corresponding to the primary protection is reached, the second protection chip (U2) 40 may control to turn off the third switch (Q1) 50, thereby turning off the charging loop (if the third switch 50 is not turned off, the fourth switch 60 may still have current passing through the charging even though its parasitic diode is turned off, and thus the third switch 50 must be turned off); thereby realizing the primary protection effect in the charging process. Or turns off the fourth switch (Q2) 60, thereby breaking the discharging loop; thereby realizing the primary protection effect in the discharging process.

In a second example:

the first protection chip (U1) 20 monitors the voltages of the first cell 101 and the second cell 102 in real time. When the voltage of any battery cell reaches a voltage threshold value, the OUT pin of the first protection chip (U1) 20 outputs a high level, and the second control switch (Q6) is controlled to be connected, so that the second switch (Q3) 32 is controlled to be switched off, the charging and discharging circuit 10 is switched off, and the main power charging loop is switched off. Therefore, the secondary protection effect in the charging process is realized.

In this example, in combination with the foregoing embodiments, the first resistor (R17) 3311 and the second resistor (R18) 3312 may also be used to realize secondary protection, such as short-circuit protection, during the discharge process. The first resistor (R17) 3311 and the second resistor (R18) 3312 may control the connection of the first control switch (Q7) 332 when the monitored current reaches the short-circuit current threshold, and further control the disconnection of the first switch (Q4) 31, so as to disconnect the main power discharge loop of the charging and discharging circuit 10. Thereby realizing secondary protection in the discharging process.

In the embodiment of the disclosure, the primary or secondary protection is realized by MOS switching devices, and compared with a scheme of blowing a fuse, the action is faster, and an abnormal circuit can be cut off quickly. And after the secondary protection action is finished and the abnormity is relieved, the communication can still be recovered under the action of the protection chip, the protection action can be repeatedly acted, and the problem that the secondary protection can only be executed once in the related technical scheme is solved.

In an exemplary embodiment, the present disclosure further provides an electronic device including the charging and discharging protection system according to the above embodiment.

In an exemplary embodiment, the embodiment of the present disclosure further provides a charging and discharging protection method, which is applied to the electronic device in the above embodiment. The electronic device is, for example, a mobile phone, a tablet computer, a notebook computer, or the like. In conjunction with the embodiment and circuit structure corresponding to fig. 2, the present embodiment can be applied to protection of the battery of the electronic device during use.

As shown in fig. 3, the method of the present embodiment may include the following steps:

s110, acquiring a first voltage of the first battery cell and a second voltage of the second battery cell.

And S120, responding to the first voltage or the second voltage reaching the voltage threshold value, and issuing a control signal to control the switch circuit to be switched off.

In step S110, in combination with the embodiment corresponding to fig. 2, the first protection chip (U1) 20 may monitor voltages of the first battery cell 101 and the second battery cell 102. The processor of the electronic device can acquire the voltage detected by the first protection chip (U1) 20.

In step S120, the voltage threshold may be, for example, an overcharge voltage threshold or an overdischarge voltage threshold. The processor of the electronic equipment issues a control signal, and the first protection chip (U1) 20 can execute a control instruction represented by the control signal according to the control signal.

For example, when the voltage threshold is the overcharge voltage threshold, the predetermined pin of the first protection chip 20 may be controlled to output a high level according to the control signal. For example, the OUT pin of the first protection chip 20 outputs a high level to control the second control switch (Q6) to be turned on, so as to control the second switch (Q3) 32 of the switch circuit 30 to be turned off, to turn off the charging and discharging circuit 10, and to cut off the main power charging process. And secondary protection in the charging process is realized.

In an exemplary embodiment, the method of this embodiment may further include the steps of:

and S130, acquiring the current of the first battery cell or the second battery cell.

And S140, responding to the current reaching the preset current threshold, and connecting the first control switch to disconnect the first switch of the switch circuit.

In step S130, with reference to fig. 2, the second protection chip (U2) 40 may monitor the voltage and the current of the first cell 101 and the second cell 102. The processor of the electronic device may obtain the detected voltage or current.

In step S140, the preset current threshold is, for example, a short-circuit current threshold. In this step, with reference to the embodiment shown in fig. 2, when the current of the charge/discharge circuit 10 reaches the short-circuit current threshold, the divided voltage of the first resistor (R17) 3311 increases to reach the on voltage of the first control switch (Q7) 332, and the first control switch (Q7) 332 is turned on, so that the first switch (Q4) 31 of the switch circuit 30 is turned off, the charge/discharge circuit 10 is turned off, and the discharge is stopped. And secondary protection of a discharging process and a short circuit is realized.

In an exemplary embodiment, the present disclosure further provides a charging and discharging protection device, which is applied to the electronic device of the foregoing embodiment, as shown in fig. 4, the device of the present embodiment includes: an acquisition module 110 and a control module 120. The apparatus of the present embodiment is used to implement the method as shown in fig. 3. The obtaining module 110 is configured to obtain a first voltage of a first battery cell and a second voltage of a second battery cell. The control module 120 is configured to issue a control signal to control the switch circuit to be turned off in response to the first voltage or the second voltage reaching a voltage threshold.

Fig. 5 is a block diagram of an electronic device. The present disclosure also provides for an electronic device, for example, the device 500 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, an exercise device, a personal digital assistant, and the like.

Device 500 may include one or more of the following components: a processing component 502, a memory 504, a power component 506, a multimedia component 508, an audio component 510, an input/output (I/O) interface 512, a sensor component 514, and a communication component 516.

The processing component 502 generally controls overall operation of the device 500, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing components 502 may include one or more processors 520 to execute instructions to perform all or a portion of the steps of the methods described above. Further, the processing component 502 can include one or more modules that facilitate interaction between the processing component 502 and other components. For example, the processing component 502 can include a multimedia module to facilitate interaction between the multimedia component 508 and the processing component 502.

The memory 504 is configured to store various types of data to support operation at the device 500. Examples of such data include instructions for any application or method operating on device 500, contact data, phonebook data, messages, pictures, videos, and so forth. The memory 504 may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.

Power component 506 provides power to the various components of device 500. The power components 506 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for the apparatus 500.

The multimedia component 508 includes a screen that provides an output interface between the device 500 and the user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 508 includes a front facing camera and/or a rear facing camera. The front-facing camera and/or the rear-facing camera may receive external multimedia data when the device 500 is in an operating mode, such as a shooting mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.

The audio component 510 is configured to output and/or input audio signals. For example, the audio component 510 includes a Microphone (MIC) configured to receive external audio signals when the device 500 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may further be stored in the memory 504 or transmitted via the communication component 516. In some embodiments, audio component 510 further includes a speaker for outputting audio signals.

The I/O interface 512 provides an interface between the processing component 502 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.

The sensor assembly 514 includes one or more sensors for providing various aspects of status assessment for the device 500. For example, the sensor assembly 514 may detect an open/closed state of the device 500, the relative positioning of the components, such as a display and keypad of the device 500, the sensor assembly 514 may also detect a change in the position of the device 500 or a component of the device 500, the presence or absence of user contact with the device 500, orientation or acceleration/deceleration of the device 500, and a change in the temperature of the apparatus 500. The sensor assembly 514 may include a proximity sensor configured to detect the presence of a nearby object in the absence of any physical contact. The sensor assembly 514 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 514 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

Communications component 516 is configured to facilitate communications between device 500 and other devices in a wired or wireless manner. The device 500 may access a wireless network based on a communication standard, such as WiFi,2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 516 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 516 further includes a Near Field Communication (NFC) module to facilitate short-range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, ultra Wideband (UWB) technology, bluetooth (BT) technology, and other technologies.

In an exemplary embodiment, the device 500 may be implemented by one or more Application Specific Integrated Circuits (ASICs), digital Signal Processors (DSPs), digital Signal Processing Devices (DSPDs), programmable Logic Devices (PLDs), field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors or other electronic components for performing the above-described methods.

A non-transitory computer readable storage medium, such as the memory 504 including instructions executable by the processor 520 of the device 500 to perform the method, is provided in another exemplary embodiment of the disclosure. For example, the computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like. The instructions in the storage medium, when executed by a processor of the electronic device, enable the electronic device to perform the above-described method.

Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims

1. A charging and discharging protection system, comprising:

2. The charging and discharging protection system according to claim 1, wherein the switching circuit comprises: a first switch and a second switch;

3. The charging and discharging protection system according to claim 2, wherein the switching circuit further comprises: a control branch;

4. The charging and discharging protection system according to claim 3, wherein the control branch is sequentially provided with from a first end to a second end: the grounding branch circuit and the first control switch;

5. The charging and discharging protection system according to claim 4, wherein the switching circuit further comprises: a third resistor;

and the third end of the first switch and the third end of the first control switch are connected with the anode of the second battery cell through a third resistor.

6. The charging and discharging protection system according to claim 2, wherein the switching circuit further comprises: a second control switch;

7. The charging and discharging protection system according to claim 1, further comprising: the second protection chip, the third switch and the fourth switch;

8. The charging and discharging protection system according to claim 7, further comprising: a third control switch;

and a first end of the third control switch is connected with a second end of the fourth switch, a second end of the third control switch is connected with a third end of the fourth switch, and a third end of the third control switch is connected with the ground.

9. An electronic device comprising the charging/discharging protection system according to any one of claims 1 to 8.

10. A method for protecting charging and discharging, which is applied to the electronic device of claim 9, the method comprising:

11. The charging and discharging protection method according to claim 10, wherein the issuing of the control signal to control the switching circuit to be opened comprises:

12. The method for protecting charging and discharging according to claim 10, further comprising:

obtaining a current of the first cell or the second cell;