Battery protection circuit and electronic device

Abstract

Disclosed in the present application are a battery protection circuit and an electronic device. The battery protection circuit comprises a signal receiving port, a switch control port and a discharge switch, wherein the signal receiving port is electrically connected to a mainboard circuit; the switch control port is electrically connected to the discharge switch; the discharge switch is configured to connect or disconnect a path between a battery and the mainboard circuit; the signal receiving port is configured to receive a preset signal sent by the mainboard circuit; when the preset signal meets a condition for entering a ship mode, the battery protection circuit enters the ship mode; and the switch control port is configured to control, when the battery protection circuit enters the ship mode, the discharge switch to disconnect the path between the battery and the mainboard circuit.

Description

Battery protection circuits and electronic equipment

[0001] Cross-references

[0002] This application claims priority to a Chinese patent application filed with the Patent Office of China on April 1, 2024, with application number 202410388781.X and invention name “Battery Protection Circuit and Electronic Device”. The entire contents of that application are incorporated herein by reference. Technical Field

[0003] The present application belongs to the field of battery technology, and specifically relates to a battery protection circuit and electronic equipment. Background Art

[0004] Before electronic devices are finally sold, components within them contain leakage currents, and the batteries themselves consume power. This can cause the batteries to slowly discharge, leading to swelling and compromising the safe use of the device. Currently, after electronic devices are manufactured, the main power supply circuit is shut off, cutting off the leakage paths of some electronic components to reduce leakage.

[0005] As shown in Figure 1a, the current solution can cut off the power supply to some load modules in the motherboard circuit, such as the load modules connected to the QBAT port in the motherboard circuit. However, by shutting down the QBAT port, the power supply to the load modules directly connected to the VBAT port in the motherboard circuit cannot be cut off. For example, the main power management integrated circuit (PMIC), fast charging circuit, near field communication (NFC) and other modules still have leakage. Summary of the Invention

[0006] The purpose of the embodiments of the present application is to provide a battery protection circuit and electronic device that can solve the problem that the existing solution cannot cut off the power supply of the load module directly connected to the VBAT port in the mainboard circuit, resulting in leakage.

[0007] In a first aspect, an embodiment of the present application provides a battery protection circuit, comprising: a signal receiving port, a switch control port, and a discharge switch; wherein the signal receiving port is electrically connected to a mainboard circuit; the switch control port is electrically connected to the discharge switch; the discharge switch is used to connect or disconnect the path between the battery and the mainboard circuit; the signal receiving port is used to receive a preset signal sent by the mainboard circuit; the battery protection circuit enters a shipping mode when the preset signal meets a condition for entering the shipping mode; the switch control port is used to control the discharge switch to disconnect the path between the battery and the mainboard circuit when the battery protection circuit enters the shipping mode.

[0008] In a second aspect, an embodiment of the present application provides an electronic device, comprising: a battery protection circuit, a battery, and a mainboard circuit as described in the first aspect; wherein the mainboard circuit is used to send a preset signal to the battery protection circuit; the battery protection circuit is used to receive the preset signal, and enter the shipping mode when the preset signal meets the conditions for entering the shipping mode; the battery protection circuit is further used to disconnect a discharge switch to power off the mainboard circuit when the battery protection circuit enters the shipping mode.

[0009] The battery protection circuit provided in an embodiment of the present application includes a signal receiving port, a switch control port, and a discharge switch; wherein the signal receiving port is electrically connected to a mainboard circuit; the switch control port is electrically connected to the discharge switch; the discharge switch is used to connect or disconnect the path between the battery and the mainboard circuit; the signal receiving port is used to receive a preset signal sent by the mainboard circuit; the battery protection circuit enters the shipping mode when the preset signal meets the conditions for entering the shipping mode; the switch control port is used to control the discharge switch to disconnect the path between the battery and the mainboard circuit when the battery protection circuit enters the shipping mode. With the battery protection circuit provided in an embodiment of the present application, when the signal receiving port receives a preset signal meeting the conditions for entering the shipping mode, the battery protection circuit enters the shipping mode, causing the switch control port to disconnect the discharge switch when the battery protection circuit enters the shipping mode, controlling the discharge switch to disconnect the path between the battery and the mainboard circuit, thereby powering off the mainboard circuit, cutting off the power supply to the load module in the mainboard circuit, and reducing leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1a is a schematic diagram of an existing solution for opening a shipping mode;

[0011] FIG1b is a schematic diagram of a circuit for starting a shipping mode in the prior art;

[0012] FIG2 is a circuit diagram of a battery protection circuit provided in an embodiment of the present application;

[0013] FIG3 is a timing diagram of a preset signal provided in an embodiment of the present application;

[0014] FIG4 a is a circuit diagram of another battery protection circuit provided in an embodiment of the present application;

[0015] FIG4 b is a circuit diagram of another battery protection circuit provided in an embodiment of the present application;

[0016] FIG5 is a circuit diagram of another battery protection circuit provided in an embodiment of the present application;

[0017] FIG6 a is a circuit diagram of another battery protection circuit provided in an embodiment of the present application;

[0018] FIG6 b is a circuit diagram of another battery protection circuit provided in an embodiment of the present application;

[0019] FIG6 c is another timing diagram of port voltage changes provided by an embodiment of the present application;

[0020] FIG7 a is a circuit diagram of another battery protection circuit provided in an embodiment of the present application;

[0021] FIG7 b is another timing diagram of port voltage changes provided by an embodiment of the present application;

[0022] FIG8 a is a circuit diagram of another battery protection circuit provided in an embodiment of the present application;

[0023] FIG8b is another timing diagram of port voltage changes provided by an embodiment of the present application;

[0024] FIG9 a is a circuit diagram of another battery protection circuit provided in an embodiment of the present application;

[0025] FIG9 b is another timing diagram of port voltage changes provided by an embodiment of the present application;

[0026] FIG10 is a timing diagram of adjusting an over-discharge protection point provided in an embodiment of the present application;

[0027] FIG11a is a circuit diagram of another battery protection circuit provided in an embodiment of the present application;

[0028] FIG11 b is a circuit diagram of another battery protection circuit provided in an embodiment of the present application;

[0029] FIG12 is a schematic structural diagram of an electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0030] The following will be combined with the accompanying drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of this application.

[0031] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0032] In the current solution, in order to address the problem of component leakage current in electronic equipment between the time when the manufacturer completes manufacturing and assembly and before the electronic equipment is finally sold, a ship mode is introduced to close the main power supply path after the electronic equipment is produced, cutting off the leakage path of some electronic components to reduce leakage. Referring to Figure 1a, by closing the QBAT port of the main power management integrated circuit (PMIC) in the motherboard circuit, the load module connected to the QBAT port in the motherboard circuit can be cut off, reducing the current leakage of electronic equipment components. However, the main PMIC, fast charging circuit, near field communication (NFC) and other modules directly connected to the VBAT port in the motherboard circuit are not cut off from the battery, so that the main PMIC and load modules directly connected to the VBAT port still have leakage. Therefore, even if the ship mode is turned on in the current solution, there are still components with leakage current.

[0033] The battery protection circuit and electronic device provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings through specific embodiments and their application scenarios to solve the above-mentioned problems.

[0034] FIG2 shows a circuit diagram of a battery protection circuit provided in an embodiment of the present application. Referring to FIG2 , the battery protection circuit 100 may include: a signal receiving port 11 , a switch control port 12 , and a discharge switch 13 .

[0035] Among them, the signal receiving port 11 is electrically connected to the main board circuit 300; the switch control port 12 is electrically connected to the discharge switch 13; the discharge switch 13 is used to connect or disconnect the path between the battery 200 and the main board circuit 300; the signal receiving port 11 is used to receive a preset signal sent by the main board circuit 300; the battery protection circuit 100 enters the shipping mode when the preset signal meets the conditions for entering the shipping mode; the switch control port 12 is used to control the discharge switch 13 to disconnect the path between the battery and the main board circuit when the battery protection circuit enters the shipping mode.

[0036] In this embodiment of the present application, based on the existing circuit diagram shown in FIG1b , a signal receiving port 11 is added to the battery protection circuit 100. This signal receiving port 11 is electrically connected to the main circuit 300 for communicating with the main circuit 300. The signal receiving port 11 cooperates with the switch control port 12 and the discharge switch 13 of the battery protection circuit 100. The switch control port 12 is electrically connected to the discharge switch 13 for controlling the closing or opening of the discharge switch 13. Under the control of the switch control port 12, the discharge switch 13 connects or disconnects the path between the battery 200 and the main circuit 300. Thus, the signal receiving port 11 can receive the preset signal sent by the mainboard circuit 300, and when the preset signal meets the conditions for entering the shipping mode, the battery protection circuit 100 enters the shipping mode. When the battery protection circuit 100 enters the shipping mode, the switch control port 12 disconnects the discharge switch 13, controls the discharge switch 13 to disconnect the path between the battery 200 and the mainboard circuit 300, thereby cutting off the power to the mainboard circuit, cutting off the power supply to the load modules in the mainboard circuit, and reducing the leakage of each load module in the mainboard circuit.

[0037] In addition, referring to the timing diagram of a preset signal provided by an embodiment of the present application shown in FIG3 , the preset signal satisfying the conditions for entering the shipping mode may include a preset number of low-level pulse signals, wherein the duration of a single pulse signal is ≥ T1, and the total duration of the preset number of low-level pulse signals is ≤ T2. Thus, the process of the battery protection circuit 100 entering the shipping mode may include: the signal receiving port 11 of the battery protection circuit 100 in a normal state receives a single pulse signal with a duration of T1 sent by the main circuit 300, and receives five such pulse signals, wherein the total duration of the five pulse signals is T2. If the pulse signal satisfies the conditions for entering the shipping mode, the battery protection circuit 100 enters the shipping mode after a delay of T3. When entering the shipping mode, the switch control port 12 disconnects the discharge switch 13, thereby cutting off the path between the main circuit 300 and the battery 200, thereby powering off the main circuit 300 and reducing leakage in the main circuit.

[0038] Figures 4a and 4b show a circuit schematic diagram of another battery protection circuit provided in an embodiment of the present application in one implementation. The battery protection circuit 100 may also include: a power control port 15; the power control port 15 is electrically connected to a first end of a power switch 31 of the mainboard circuit 300, and the other end of the power switch 31 is grounded; wherein, the battery protection circuit 100 exits the shipping mode when triggered by the power switch 31.

[0039] In this embodiment of the present application, the battery protection circuit 100 further includes a power control port 15; this power control port 15 is electrically connected to a first terminal of a power switch 31 of the main circuit 300, the other terminal of which is grounded. The discharge switch 13 can be located in the path between the negative electrode of the battery 200 and the main circuit 300, as shown in FIG4a , or in the path between the positive electrode of the battery 200 and the main circuit 300, as shown in FIG4b . When the signal receiving port 11 of the battery protection circuit enters the shipping mode based on the received preset signal that meets the conditions for entering the shipping mode, the battery protection circuit 100, under the triggering of the power switch 31 of the main board circuit, forms a loop from the power control port 15 to the power switch 31 of the main board circuit to the negative pole of the battery 200, so that the voltage of the power control port 15 changes and the changed voltage lasts for a preset time, then the conditions for exiting the shipping mode are met, and the battery protection circuit 100 exits the shipping mode. The switch control port 12 closes the discharge switch 13 when the battery protection circuit exits the shipping mode, thereby exiting the shipping mode in response to the triggering of the power switch 31 of the main board circuit, connecting the path between the main board circuit 300 and the battery 200, so that the main board circuit 300 is powered and the main board circuit is normally powered.

[0040] FIG5 shows a circuit diagram of another battery protection circuit provided in an embodiment of the present application in one implementation. Referring to FIG5 , the battery protection circuit 100 may further include a first switch 171 and a first resistor 1811. The first switch 171 is used to connect or disconnect the path between the first resistor 1811 and a first preset power source 1812. The power control port 15 is electrically connected to the first resistor 1811.

[0041] In an embodiment of the present application, one end of the power control port 15 is electrically connected to the first end of the power switch 31 of the mainboard circuit 300, and the other end of the power control port 15 is electrically connected to the first resistor 1811. The first resistor 1811 is electrically connected to the first preset power supply 1812 through the first switch 171, wherein the first preset power supply can be the battery 200 or an internal power supply added to the battery protection circuit 100. Thus, the battery protection circuit 100 receives a preset signal that meets the conditions for entering the shipping mode at the signal receiving port 11 and enters the shipping mode. Then, the first switch 171 is closed, connecting the resistor 1811 and the preset power supply 1812. When the battery protection circuit 100 is triggered by the power switch 31 of the main board circuit, a loop is formed from the first preset power supply 1812, the first switch 171, the first resistor 1811, the power control port 15, the power switch 31 of the main board circuit to the negative electrode of the battery 200, so that the voltage of the power control port 15 changes and lasts for a first preset time, then the conditions for exiting the shipping mode are met, and the battery protection circuit 100 exits the shipping mode. The switch control port 12 closes the discharge switch 13 when the battery protection circuit exits the shipping mode, thereby exiting the shipping mode in response to the triggering of the power switch 31 of the main board circuit, connecting the path between the main board circuit 300 and the battery 200, so that the main board circuit 300 is powered and the main board circuit is normally powered.

[0042] In one implementation, an embodiment of the present application provides a circuit diagram of another battery protection circuit, wherein the battery protection circuit 100 may further include a connection port 16 and a third resistor 183; the connection port 16 is electrically connected to a first connection point 10 through the third resistor 183, and the first connection point 10 is provided in a path between the discharge switch 13 and the main board circuit 300; wherein the battery protection circuit 100 exits the shipping mode when triggered by the power switch 31.

[0043] In an embodiment of the present application, the connection port 16 is electrically connected to the first connection point 10 of the path between the discharge switch 13 and the main board circuit 300 through the third resistor 183, so that another path is established between the battery 100 or the additional internal power supply and the main board circuit, so that when the battery protection circuit 100 is triggered by the power switch 31 of the main board circuit, the voltage of the connection port 16 can change and last for a first preset time, and the condition for exiting the shipping mode is met, and the battery protection circuit 100 exits the shipping mode.

[0044] Figure 6a shows a circuit diagram of another battery protection circuit provided in an embodiment of the present application. Referring to Figure 6a, the above-mentioned battery protection circuit may further include: a second switch 172 and a power ground port 14 electrically connected to the negative pole of the battery 200. When the first preset power source is the battery 200, the second switch 172 is electrically connected to the negative pole of the battery 200 through the power ground port 14.

[0045] Among them, after the battery protection circuit 100 enters the shipping mode, the first switch 171 and the second switch 172 are closed, connecting the connection port 16 with the power ground terminal 14, which is equivalent to connecting the third resistor 183 in series between B- and P-. At this time, P+ / P- is charged, and the B+ / B- of the battery 200 can discharge the mainboard circuit 300 through the loop formed by the power ground terminal 14, the second switch 172, the connection port 16, the third resistor 183 and P-. Therefore, the value of the third resistor 183 needs to be large enough to minimize the current in the loop and reduce the leakage of the mainboard circuit 300.

[0046] Optionally, referring to FIG6b , the first preset power source 1812 in the embodiment of the present application is directly electrically connected to the first resistor 1811, without being electrically connected through the first switch 171. The embodiment of the present application may further include a second resistor 1821 connected between the connection port 16 and the second switch 172. Referring to FIG6b , the second resistor 1821 functions in the battery protection circuit 100 similarly to the third resistor 183, and is used to minimize the loop current and reduce leakage of the mainboard circuit 300 when the second switch 172 is closed.

[0047] In an embodiment of the present application, after the battery protection circuit 100 enters the shipping mode, the first switch 171 and the second switch 172 are closed, so that the connection port 16 is connected to the power ground port 14 through the second switch 172, so that after the power switch 31 of the main board circuit is triggered, a loop is formed from the first preset power supply 1812, the first switch 171, the first resistor 1811, the power control port 15, the power switch 31 of the main board circuit, the third resistor 183, the connection port 16, the second switch 172, the power ground port 14 to the negative electrode of the battery 200, so that the voltage of the power control port 15 changes, meeting the conditions for exiting the shipping mode, and controlling the battery protection circuit 100 to exit the shipping mode. When the battery protection circuit exits the shipping mode, the switch control port 12 closes the discharge switch 13, connects the path between the main board circuit 300 and the battery 200, so that the main board circuit 300 is powered and the main board circuit is powered normally, so that the main board circuit can operate normally after the battery protection circuit exits the shipping mode.

[0048] In addition, referring to FIG6c , an embodiment of the present application provides a timing diagram of port voltage changes, in this embodiment, the power control port 15. Referring to FIG6b , the battery protection circuit 100 enters shipping mode, the switch 17 is closed, and the voltage at the power control port 15 is the voltage Vpu of the first preset power source. When the power switch 31 of the main circuit is triggered, a loop is formed from the first preset power source 1812, the first resistor 1811, the power control port 15, the main circuit power switch 31, the third resistor 183, the connection port 16, the second resistor 1821, the second switch 172, the power ground port 14, and the negative electrode of the battery 200. At this time, the voltage at the power control port 15 changes to Vpu*[Rm / (Rp+Rm)], where Rm is the resistance value of the second resistor 1821 and Rp is the resistance value of the first resistor 1811. After the voltage of the power control port 15 lasts for T4 (ie, the debounce time), the battery protection circuit 100 exits the shipping mode, the switch control port 12 closes the discharge switch 13, and the voltage of the power control port 15 returns to Vpu.

[0049] Figure 7a shows a circuit diagram of another battery protection circuit provided in an embodiment of the present application in one implementation. Referring to Figure 7a, the battery protection circuit further includes: a second switch 172 and a second resistor 1821. The second switch 172 is used to connect or disconnect the path between the second resistor 1821 and the second preset power source 1822; wherein the connection port 16 is electrically connected to the second resistor 1821.

[0050] In the embodiment of the present application, after the battery protection circuit 100 enters the shipping mode, the first switch 171 and the second switch 172 are closed, so that the connection port 16 is connected to the second preset power source 1822 through the second resistor 1821, and the power control port 15 is connected to the first preset power source 1812 through the first resistor 1811. Therefore, after the power switch 31 of the main circuit is triggered, the second preset power source 1822, the second switch 172, the second resistor 1821, the connection port 16, the third resistor 183, the power switch 31 of the main circuit, and the power control port 15 are connected. , the first resistor 1811, the first switch 171, and the first preset power supply 1812 form a loop, so that the voltage of the power control port 15 and the connection port 16 changes, and the conditions for exiting the shipping mode are met, and the battery protection circuit 100 is controlled to exit the shipping mode. When the battery protection circuit exits the shipping mode, the switch control port 12 closes the discharge switch 13, connects the path between the main board circuit 300 and the battery 200, so that the main board circuit 300 is powered and the main board circuit is normally powered, so that the main board circuit can work normally after the battery protection circuit exits the shipping mode.

[0051] It should be noted that after the battery protection circuit of this embodiment enters the shipping mode, there is no voltage between P+ / P-, and the leakage situation of the embodiments shown in Figures 6a and 6b does not exist. Therefore, this embodiment can better reduce the leakage of the mainboard circuit.

[0052] 7b shows a timing diagram of port voltage changes according to an embodiment of the present application. In this embodiment, the timing diagram shows power control port 15 and connection port 16. After the battery protection circuit 100 enters the shipping mode, the first switch 171 and the second switch 172 are closed. The voltage at connection port 16 is Vpu2, the voltage of the second preset power source, and the voltage at power control port 15 is Vpu1, the voltage of the first preset power source. When the power switch 31 of the mainboard circuit is triggered, a loop is formed from the second preset power source 1822, the second switch 172, the second resistor 1821, the connection port 16, the third resistor 183, the power switch 31 of the mainboard circuit, the power control port 15, the first resistor 1811, the first switch 171, and the first preset power source 1812. At this time, the voltage of the power control port 15 changes to Vpu1-Rp*[(Vpu1-Vpu2) / (Rp+Rm+R1)], and the voltage of the connection port 16 changes to Vpu2+Rm*[(Vpu1-Vpu2) / (Rp+Rm+R1)], where Rp is the resistance value of the first resistor 1811, Rm is the resistance value of the second resistor 1821, and R1 is the resistance value of the third resistor. After the voltage at the power control port 15 lasts for T4 (i.e., the debounce time), the battery protection circuit 100 exits the shipping mode, the switch control port 12 closes the discharge switch 13, the voltage at the power control port 15 changes back to the voltage of the battery 100, and the voltage at the connection port 16 changes back to 0 (power ground terminal 14).

[0053] FIG8 a shows a circuit diagram of another battery protection circuit provided in an embodiment of the present application, in one implementation. Referring to FIG8 a , the battery protection circuit further includes: a power ground port 14 electrically connected to the negative electrode of the battery 200; when the second preset power source is the battery 200, the first switch 171 is electrically connected to the negative electrode of the battery 200 through the power ground port 14.

[0054] In the embodiment of the present application, after the battery protection circuit 100 enters the shipping mode, the first switch 171 and the second switch 172 are closed, so that the connection port 16 is connected to the second preset power source 1822 through the second resistor 1821, and the power control port 15 is connected to the power ground terminal 14 through the first resistor 1811. Therefore, after the power switch 31 of the main circuit is triggered, the second preset power source 1822, the second switch 172, the second resistor 1821, the connection port 16, the third resistor 183, the power switch 31 of the main circuit, the power control port 15, the first resistor 1811, the power supply 14 ... first resistor 1811, the power supply 14, the first resistor 1811, the power supply 14, the first resistor 1811, the power supply 14, the first resistor 1811, the power supply 14, the first resistor 1811, the power supply 14 A loop is formed from the resistor 1811, the switch 171, the power ground terminal 14 to the negative pole of the battery 200, so that the voltage of the power control port 15 and the connection port 16 changes, and the conditions for exiting the shipping mode are met, and the battery protection circuit 100 is controlled to exit the shipping mode. When the battery protection circuit exits the shipping mode, the switch control port 12 closes the discharge switch 13, connects the path between the main board circuit 300 and the battery 200, so that the main board circuit 300 is powered and the main board circuit is normally powered, so that the main board circuit can work normally after the battery protection circuit exits the shipping mode.

[0055] It should be noted that after the battery protection circuit of this embodiment enters the shipping mode, there is no voltage between P+ / P-, and the leakage situation of the embodiments shown in Figures 6a to 6b does not exist. Therefore, this embodiment can better reduce the leakage of the mainboard circuit.

[0056] 8b shows a timing diagram of port voltage changes according to an embodiment of the present application. In this embodiment, the timing diagram shows power control port 15 and connection port 16. After the battery protection circuit 100 enters the shipping mode, the first switch 171 and the second switch 172 are closed. The voltage at connection port 16 is the second preset power supply voltage Vpu2, and the voltage at power control port 15 is 0 (power ground 14). When the power switch 31 of the mainboard circuit is triggered, a loop is formed from the second preset power source 1822, the switch 172, the second resistor 1821, the connection port 16, the third resistor 183, the power switch 31 of the mainboard circuit, the power control port 15, the first resistor 1811, the switch 171, the power ground terminal 14 to the negative electrode of the battery 200. At this time, the voltage of the power control port 15 changes to Vpu2*[Rp / (Rp+Rm+R1)], and the voltage of the connection port 16 changes to Vpu2*[(Rp+R1) / (Rp+Rm+R1)], where Rp is the resistance value of the first resistor 1811, Rm is the resistance value of the second resistor 1821, and R1 is the resistance value of the third resistor. After the voltage at the power control port 15 lasts for T4 (i.e., the debounce time), the battery protection circuit 100 exits the shipping mode, the switch control port 12 closes the discharge switch 13, the voltage at the power control port 15 changes back to the voltage of the battery 100, and the voltage at the connection port 16 changes back to 0 (power ground terminal 14).

[0057] In one implementation, in the above-mentioned battery protection circuit 100, the discharge switch 13 can be used to connect or disconnect the path between the negative electrode of the battery 200 and the main board circuit 300, see Figures 4a, 5, 6a, 7a, and 8a.

[0058] In another implementation, in the above-mentioned battery protection circuit 100 , the discharge switch 13 can be used to connect or disconnect the path between the positive electrode of the battery 200 and the mainboard circuit 300 , as shown in FIG4 b .

[0059] In this embodiment of the present application, since the path between the negative electrode of the battery 200 and the main circuit board 300 is not cut off, there is no need to establish another path through the connection port. Referring to Figure 9a, one end of the power control port 15 is connected in series with the first resistor 1811, the first switch 171, and the first preset power source 1812, respectively. The other end of the power control port 15 is electrically connected to the power switch 31 of the main circuit board. After the battery protection circuit 100 enters the shipping mode, the first switch 171, which connects or disconnects the path between the resistor and the preset power source, is closed, connecting the power control port 15 to the first preset power source 1812 through the first resistor 1811. Therefore, after the power switch 31 of the main board circuit is triggered, a loop is formed from the first preset power supply 1812, the first switch 171, the first resistor 1811, the power control port 15, the power switch 31 of the main board circuit to the negative pole of the battery 200, that is, the power control port 15 is short-connected to the negative pole of the battery 200, so that the voltage of the power control port 15 changes, meeting the conditions for exiting the shipping mode, and controlling the battery protection circuit 100 to exit the shipping mode. When the battery protection circuit exits the shipping mode, the switch control port 12 closes the discharge switch 13, connects the path between the main board circuit 300 and the battery 200, so that the main board circuit 300 is powered on, and the main board circuit is powered normally, so that the main board circuit can work normally after the battery protection circuit exits the shipping mode.

[0060] In addition, see FIG9 b for a timing diagram of a port voltage change provided in an embodiment of the present application, which is the power control port 15 in this embodiment. After the battery protection circuit 100 enters the shipping mode, the first switch 171 is closed, and the voltage of the power control port 15 is the voltage Vpu of the first preset power supply. When the power switch 31 of the mainboard circuit is triggered, a loop is formed from the first preset power supply 1812, the first switch 171, the first resistor 1811, the power control port 15, the power switch 31 of the mainboard circuit to the negative pole of the battery 200. At this time, the voltage of the power control port 15 changes to 0. After the voltage of the power control port 15 lasts for T4 time (i.e., the debounce time), the battery protection circuit 100 exits the shipping mode, the switch control port 12 closes the discharge switch 13, and the voltage of the power control port 15 returns to Vpu.

[0061] It should be noted that, unlike the embodiments shown in Figures 4a, 5, 6a, 7a, and 8a above, in which the discharge switch 13 is located in the path between the negative pole of the battery 200 and the main board circuit 300, the battery protection circuit 100 in this embodiment, in which the discharge switch 13 is located in the path between the positive pole of the battery 200 and the main board circuit 300, can maintain the same position of B- and P- after entering the shipping mode, and can exit the shipping mode through the loop control formed by the first resistor 181, the power control port 15, the power switch 31 of the main board circuit, and the negative pole of the battery 200, without adding other paths through the connection port.

[0062] In one implementation, the battery protection circuit is further configured to detect the power-on status of the mainboard circuit 300 through the signal receiving port 11 , and adjust the over-discharge protection point of the battery protection circuit 100 based on the power-on status of the mainboard circuit 300 .

[0063] In the embodiment of the present application, since the silicon negative electrode battery currently used has a higher gas production voltage and is prone to bulging problems, and the silicon negative electrode battery supports a lower shutdown voltage, in applications using silicon negative electrode batteries, it is necessary to increase the over-discharge protection point of the battery protection circuit and at the same time reduce the shutdown voltage point of the electronic device to a value close to the over-discharge protection point of the battery protection circuit. This may cause the load fluctuation to cause the battery voltage to fluctuate when the electronic device is close to shutting down due to the influence of the battery internal resistance, which may trigger the battery over-discharge protection during normal use, thereby causing abnormal power failure and a poor user experience. Based on this, the battery protection circuit 100 provided in the embodiment of the present application can adjust the over-discharge protection point of the battery protection circuit 100 according to the power-on status of the mainboard circuit 300. For example, when the electronic device is normally turned on and used, the over-discharge protection point is adjusted to a lower value, such as 2.35V. In the shutdown state, the over-discharge protection point is adjusted to a higher value, such as 2.6V, thereby increasing the storage time of the electronic device.

[0064] Figure 10 shows a timing diagram for adjusting the over-discharge protection point provided by an embodiment of the present application. Referring to Figure 10, when the electronic device is in the off state, the battery protection circuit 100 adjusts the over-discharge protection point to Vpu1 based on the power-off state of the mainboard circuit 300; when the electronic device is in the on state, the over-discharge protection point is adjusted to Vpu2 based on the power-on state of the mainboard circuit 300; when the electronic device is in the on state and needs to enter the shipping mode, the mainboard circuit 300 sends a specific sequence of low-level pulse signals to the signal receiving end 11 of the battery protection circuit 100. The signal receiving end 11 receives the low-level pulse signal, determines that the low-level pulse signal meets the conditions for entering the shipping mode, and then enters the shipping mode after a delay T3.

[0065] In one implementation, referring to Figures 11a and 11b , the battery protection circuit 100 may further include a battery identification module 120. The battery identification module 120 is electrically connected to the signal receiving port 11 and configured to transmit identification information of the battery 200 to the mainboard circuit 300 via the signal receiving port 11.

[0066] In an embodiment of the present application, a battery identification module 120 can be integrated into the battery protection circuit 100, and the battery identification module 120 is electrically connected to the signal receiving port 11 so that the identification information of the battery 200 can be sent to the mainboard circuit 300 through the signal receiving port 11, so that the mainboard circuit 300 can confirm the identification information of the battery. Optionally, due to the detachability of the battery of the electronic device, if the battery is replaced with an unofficial battery, there will be certain safety hazards when using functions such as fast charging. In order to ensure charging safety and more securely confirm the identification information of the battery, the identification information of the battery can be encrypted battery identification information.

[0067] 11a shows the case where the discharge switch 13 is located between the negative electrode of the battery 200 and the main circuit 300 , and FIG. 11b shows the case where the discharge switch 13 is located between the positive electrode of the battery 200 and the main circuit 300 .

[0068] FIG12 shows a schematic structural diagram of an electronic device provided in an embodiment of the present application. Referring to FIG12 , the electronic device 1200 includes a battery protection circuit 100 , a battery 200 , and a mainboard circuit 300 .

[0069] Among them, the main board circuit 300 is used to send a preset signal to the battery protection circuit 100; the battery protection circuit 100 is used to receive the preset signal, and enter the shipping mode when the preset signal meets the conditions for entering the shipping mode; the battery protection circuit 100 is also used to disconnect the discharge switch 13 when the battery protection circuit enters the shipping mode, so as to cut off the power to the main board circuit.

[0070] In one implementation, when the battery protection circuit 100 enters the shipping mode, the battery protection circuit 100 is also used to exit the shipping mode under the triggering of the power switch 31 of the main board circuit 300; the battery protection circuit 100 is also used to close the discharge switch 13 to power on the main board circuit 300 when the battery protection circuit 100 exits the shipping mode.

[0071] In one implementation, the battery protection circuit 100 is further configured to adjust an over-discharge protection point of the battery protection circuit 100 based on a power-on condition of the mainboard circuit 300 .

[0072] In one implementation, the battery protection circuit 100 is further configured to send identification information of the battery 200 to the mainboard circuit 300 .

[0073] In an embodiment of the present application, the mainboard circuit 300 sends a preset signal to the signal receiving port of the battery protection circuit 100. The signal receiving port receives the preset signal and determines whether the preset signal meets the conditions for entering the shipping mode. When the conditions for entering the shipping mode are met, the battery protection circuit 100 enters the shipping mode. Thus, when the battery protection circuit enters the shipping mode, the switch control port of the battery protection circuit 100 disconnects the discharge switch to power off the mainboard circuit, thereby cutting off the power supply to the load modules in the mainboard circuit and reducing the leakage of each load module in the mainboard circuit, thereby improving the storage time of the electronic device.

[0074] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0075] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), including a number of instructions for enabling a terminal (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0076] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

Claims

1. A battery protection circuit, comprising: Signal receiving port, switch control port and discharge switch; The signal receiving port is electrically connected to the mainboard circuit; the switch control port is electrically connected to the discharge switch; the discharge switch is used to connect or disconnect the path between the battery and the mainboard circuit; The signal receiving port is used to receive a preset signal sent by the mainboard circuit; The battery protection circuit enters the shipping mode when the preset signal meets the conditions for entering the shipping mode; The switch control port is used to control the discharge switch to disconnect the path between the battery and the mainboard circuit when the battery protection circuit enters the shipping mode.

2. The battery protection circuit according to claim 1, wherein: The battery protection circuit further includes: a power control port; the power control port is electrically connected to a first end of a power switch of the mainboard circuit, and the other end of the power switch is grounded; The battery protection circuit exits the shipping mode when triggered by the power switch.

3. The battery protection circuit according to claim 2, wherein: The battery protection circuit further includes: a first switch and a first resistor, wherein the first switch is used to connect or disconnect a path between the first resistor and a first preset power source; Wherein, the power control port is electrically connected to the first resistor.

4. The battery protection circuit according to claim 3, wherein: The battery protection circuit further includes: a connection port and a third resistor; the connection port is electrically connected to a first connection point via the third resistor, and the first connection point is provided in a path between the discharge switch and the main circuit; Wherein, the battery protection circuit exits the shipping mode when triggered by the power switch.

5. The battery protection circuit according to claim 4, wherein: The battery protection circuit further includes: a second switch and a power grounding port electrically connected to the negative electrode of the battery; In a case where the first preset power source is the battery, the second switch is electrically connected to the negative electrode of the battery through the power ground port.

6. The battery protection circuit according to claim 4, wherein: The battery protection circuit further includes: a second switch and a second resistor, wherein the second switch is used to connect or disconnect a path between the second resistor and a second preset power source; Wherein, the connection port is electrically connected to the second resistor.

7. The battery protection circuit according to claim 6, wherein: The battery protection circuit further includes: a power grounding port electrically connected to the negative electrode of the battery; When the second preset power source is the battery, the first switch is electrically connected to the negative electrode of the battery through a power ground port.

8. The battery protection circuit according to any one of claims 1 to 7, wherein: The discharge switch is used to connect or disconnect the path between the negative electrode of the battery and the mainboard circuit.

9. The battery protection circuit according to any one of claims 1 to 7, wherein: The discharge switch is used to connect or disconnect the path between the positive electrode of the battery and the mainboard circuit.

10. The battery protection circuit according to any one of claims 1 to 7, wherein: The battery protection circuit is further configured to detect a power-on status of the mainboard circuit through the signal receiving port, and adjust an over-discharge protection point of the battery protection circuit based on the power-on status of the mainboard circuit.

11. The battery protection circuit according to any one of claims 1 to 7, wherein: The battery protection circuit further includes: a battery identification module; Wherein, the battery identification module is electrically connected to the signal receiving port; The battery identification module is used to send the identification information of the battery to the mainboard circuit through the signal receiving port.

12. An electronic device comprising: The battery protection circuit, battery, and mainboard circuit according to any one of claims 1 to 11; Wherein, the mainboard circuit is used to send a preset signal to the battery protection circuit; The battery protection circuit is configured to receive the preset signal and enter the shipping mode when the preset signal satisfies a condition for entering the shipping mode; The battery protection circuit is further configured to disconnect the discharge switch when the battery protection circuit enters the shipping mode, so as to cut off power to the mainboard circuit.

13. The electronic device according to claim 12, wherein: When the battery protection circuit enters the shipping mode, the battery protection circuit is further configured to exit the shipping mode when triggered by the power switch of the mainboard circuit; The battery protection circuit is further configured to close the discharge switch to power on the mainboard circuit when the battery protection circuit exits the shipping mode.

14. The electronic device according to claim 12, wherein: The battery protection circuit is further configured to adjust an over-discharge protection point of the battery protection circuit based on a power-on condition of the mainboard circuit.

15. The electronic device according to claim 12, wherein The battery protection circuit is further configured to send identification information of the battery to the mainboard circuit.

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