Protection circuit of silicon negative electrode mobile phone battery

Abstract

The utility model relates to the technical field of mobile phone batteries, and discloses a protection circuit of a silicon cathode mobile phone battery, which comprises a mobile phone mainboard module. The primary protection module is connected with the mobile phone mainboard module and is used for protection of overvoltage, undervoltage, charging and discharging overcurrent and short circuit of a mobile phone mainboard; the battery module is connected with the primary protection module; and the under-voltage and over-discharge protection module is connected between the mobile phone mainboard module and the primary protection module, and the primary protection module enters or exits from different under-voltage and over-discharge protection values according to different voltages output by the mobile phone mainboard module. According to the utility model, through the design of the under-voltage and over-discharge protection module, the primary protection module can receive the real-time voltage value of the mobile phone mainboard module, and then the primary protection module is controlled to enter or exit different under-voltage and over-discharge protection values, transportation modes or turn-off states, so that the battery can use the capacity more fully; and the phenomenon that the battery is damaged and swelled due to high power consumption of the battery and the host can be effectively prevented, and the use safety of the battery is effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of mobile phone batteries, and in particular relates to a protection circuit for a silicon negative electrode mobile phone battery. Background Art

[0002] Silicon-negative mobile phone batteries can discharge at a lower voltage than conventional batteries, offering greater capacity within the same voltage range and size. Conventional mobile phone battery protection circuits only have one undervoltage discharge protection value. To fully utilize the battery cell's charge when the silicon-negative mobile phone battery is powered on, the cell voltage needs to be lowered, so the corresponding undervoltage discharge protection value of the protection circuit needs to be designed even lower. To prevent damage from excessive discharge when the silicon-negative mobile phone battery is powered off, the cell voltage cannot be lowered too low, so the undervoltage discharge protection value of the protection circuit needs to be designed even higher. A mobile phone battery protection circuit with only one undervoltage discharge protection value cannot protect silicon-negative mobile phone batteries.

[0003] Therefore, there is an urgent need to design a protection circuit for silicon negative electrode mobile phone batteries. Utility Model Content

[0004] To address the shortcomings of the prior art, the present invention provides a protection circuit for a silicon-negative cell phone battery. Through the design of an undervoltage and overdischarge protection module, the primary protection module can receive the real-time voltage value of the cell phone's mainboard module, thereby controlling the primary protection module to enter or exit different undervoltage and overdischarge protection values, shipping mode, and shutdown state. This allows the protection circuit to have a lower undervoltage and discharge protection value when the cell phone is powered on, allowing for more efficient use of the silicon-negative battery capacity. In the powered-off state, the undervoltage and discharge protection value is higher, effectively preventing damage and swelling to the battery due to excessive power consumption of the battery and host, thereby improving battery safety.

[0005] The technical effects to be achieved by the present invention are achieved through the following aspects:

[0006] The utility model provides a protection circuit for a silicon negative electrode mobile phone battery, comprising

[0007] Mobile phone motherboard module, used for data transmission and sharing;

[0008] A primary protection module, connected to the mobile phone motherboard module, for protecting the mobile phone motherboard from overvoltage, undervoltage, charge and discharge overcurrent, and short circuit;

[0009] A battery module, connected to the primary protection module, for providing power to the mobile phone motherboard; and

[0010] The undervoltage and overdischarge protection module is connected between the mobile phone mainboard module and the primary protection module. According to the different voltages output by the mobile phone mainboard module, the primary protection module enters or exits different undervoltage and overdischarge protection values.

[0011] In some implementations, the primary protection module includes a protection chip U2, a transistor Q3, and a transistor Q4 connected in parallel, and the protection chip U2 is provided with a CNT1 terminal.

[0012] In some implementations, the mobile phone mainboard module is provided with a CNT2 terminal;

[0013] The undervoltage and overdischarge protection module is connected between the CNT1 terminal and the CNT2 terminal.

[0014] In some implementations, the undervoltage and overdischarge protection module includes a resistor R5 connected between the CNT1 terminal and the CNT2 terminal.

[0015] In some implementations, the protection circuit of the silicon negative electrode mobile phone battery further includes a switching module for exiting the shipping mode of the mobile phone motherboard;

[0016] The switching module is connected between the mobile phone mainboard module and the primary protection module.

[0017] In some implementations, the protection chip U2 is provided with a PS1 pin terminal; the mobile phone motherboard module is provided with a PS2 pin terminal and a motherboard positive terminal P+;

[0018] The battery module includes a battery positive terminal B+ and a battery negative terminal B-.

[0019] In some implementations, the switching module includes a resistor R10 and a switch SW, the resistor R10 is connected between the PS1 pin end and the PS2 pin end, one end of the switch SW is connected between the resistor R10 and the PS2 pin end, and the other end of the switch SW is connected between the battery positive terminal B+ and the mainboard positive terminal P+.

[0020] In some implementations, the protection circuit of the silicon negative electrode mobile phone battery further includes a secondary protection module, which is connected between the primary protection module and the battery module.

[0021] In some implementations, the secondary protection module includes a protection chip U1 , a transistor Q1 , and a transistor Q2 connected in parallel.

[0022] In some implementations, the protection circuit of the silicon negative electrode mobile phone battery further includes a communication authentication module, and the communication authentication module is connected between the mobile phone mainboard module and the primary protection module.

[0023] In summary, the present invention has at least the following advantages:

[0024] 1. The protection circuit for silicon-anode mobile phone batteries provided by this utility model utilizes an undervoltage and overdischarge protection module. The mobile phone motherboard module outputs different voltage values ​​to control the first-level protection module to enter / exit different undervoltage and overdischarge protection levels. This allows the protection circuit to operate at a lower undervoltage and discharge protection level when the mobile phone battery is powered on, allowing for more efficient use of the silicon-anode battery capacity. When the mobile phone is powered off, the undervoltage and discharge protection level is increased, effectively preventing damage and swelling of the battery due to excessive power consumption of the battery and host, thereby enhancing battery safety.

[0025] 2. The protection circuit of the silicon negative electrode mobile phone battery provided by the present invention can also enter / exit the transportation mode according to different voltage values. The transportation mode can reduce the power consumption of the battery and the host, effectively preventing the phenomenon of battery damage and swelling caused by excessive power consumption, thereby ensuring the function and safety of the battery.

[0026] 3. The protection circuit for the silicon-negative mobile phone battery provided by this utility model can also switch the primary protection module into and out of a shutdown state depending on the voltage value. This shutdown function provides safety assurance for the battery assembly into the entire device. During assembly, the battery enters the shutdown state. After confirming that there are no abnormalities in the battery, the shutdown state is released and the battery can be used normally, thereby ensuring a safe and reliable assembly process. It also provides active control for the mobile phone motherboard. If the mobile phone motherboard detects any abnormal battery conditions, such as high temperature, abnormal voltage or current, the mobile phone motherboard can actively shut down the battery, thereby ensuring the safety of the entire device and battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the protection circuit in Example 1.

[0028] Figure 2 Schematic diagram of the protection circuit in Example 1.

[0029] Figure 3 Schematic diagram of the protection circuit in Example 2.

[0030] Figure 4 Schematic diagram of the protection circuit in Example 2.

[0031] Figure 5 Schematic diagram of the structure of the protection circuit in Example 3.

[0032] Figure 6Schematic diagram of the protection circuit in Example 3.

[0033] Markings in the figure:

[0034] 1. Mobile phone mainboard module; 2. Primary protection module; 3. Battery module; 4. Undervoltage and over-discharge protection module; 5. Switching module; 6. Secondary protection module; 7. Communication authentication module. DETAILED DESCRIPTION

[0035] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1:

[0038] Please see the attached Figure 1 -Attached Figure 2 The utility model discloses a protection circuit for a silicon negative electrode mobile phone battery, comprising a mobile phone motherboard module 1, a primary protection module 2, a battery module 3 and an undervoltage and overdischarge protection module 4. The mobile phone motherboard module 1 is used for data transmission and sharing; the primary protection module 2 is connected to the mobile phone motherboard module 1 and is used for protecting the mobile phone motherboard from overvoltage, undervoltage, charge and discharge overcurrent and short circuit; the battery module 3 is connected to the primary protection module 2 and is used to provide power for the mobile phone motherboard; the undervoltage and overdischarge protection module 4 is connected between the mobile phone motherboard module 1 and the primary protection module 2. According to the different voltages output by the mobile phone motherboard module 1, the primary protection module 2 enters or exits different undervoltage and overdischarge protection values.

[0039] The protection circuit in this embodiment receives different voltage values ​​output by the mobile phone mainboard module 1 through the primary protection module 2, and then controls the primary protection module 2 to enter / exit different undervoltage and overdischarge protection levels. This allows the protection circuit to lower the undervoltage and overdischarge protection level when the mobile phone battery is powered on, thereby more fully utilizing the silicon negative battery capacity. When the mobile phone is powered off, the undervoltage and overdischarge protection level is higher, effectively preventing damage and swelling of the battery due to excessive power consumption of the battery and host, thereby effectively improving battery safety.

[0040] In addition, different voltage values ​​output by the mobile phone motherboard module 1 can also control the first-level protection module 2 to enter / exit the transportation mode. The transportation mode can reduce the power consumption of the battery and the host, effectively preventing the phenomenon of battery damage and swelling caused by excessive power consumption, thereby ensuring the function and safety of the battery.

[0041] Different voltage levels output by mobile phone motherboard module 1 also control the entry / exit of the shutdown state of primary protection module 2. This function provides safety during battery assembly into the entire device. During assembly, the battery enters the shutdown state. After confirming that there are no abnormalities in the battery, the shutdown state is released and the battery can be used normally, thus ensuring a safe and reliable assembly process. It also provides active control for the mobile phone motherboard. If the mobile phone motherboard detects any abnormal battery conditions, such as high temperature, abnormal voltage or current, the mobile phone motherboard can actively shut down the battery, thus ensuring the safety of the entire device and battery.

[0042] In some embodiments, the primary protection module 2 includes a protection chip U2, a transistor Q3, and a transistor Q4 connected in parallel. The protection chip U2 is provided with a CNT1 terminal. The mobile phone motherboard module 1 is provided with a CNT2 terminal. The undervoltage and overdischarge protection module 4 is connected between the CNT1 and CNT2 terminals. The undervoltage and overdischarge protection module 4 includes a resistor R5 connected between the CNT1 and CNT2 terminals. Resistor R5 provides current limiting, preventing high current from entering and damaging the protection chip U2.

[0043] With the above settings, the CNT1 terminal of the protection chip U2 is connected to the CNT2 terminal of the mobile phone motherboard module 1 through the resistor R5, so that the mobile phone motherboard module 1 outputs different voltage values ​​to control the protection chip U2 to enter / exit different undervoltage and over-discharge protection values ​​or shipping mode or shutdown state. The specific states are as follows:

[0044] State 1: When the voltage U output by the phone's mainboard module 1 is -0.1V < U < 0.1V for 64mS, the phone enters shutdown mode. The undervoltage protection threshold is 2.8V. When the voltage falls below 2.8V and persists for the delay time, the battery enters undervoltage protection mode. Protection chip U2 shuts down discharge, prohibiting discharge by transistors Q3 and Q4. When the voltage rises above 2.8V and persists for the delay time, the battery resumes normal operation, protection chip U2 resumes discharge, and transistors Q3 and Q4 allow discharge. The higher undervoltage discharge protection threshold in the shutdown state prevents damage and swelling due to excessive power consumption of the battery and host, effectively improving battery safety.

[0045] State 2: When the voltage U output by the phone's mainboard module 1 is 0.3V < U < 0.8V for 64mS, the phone enters the power-on state. The undervoltage protection threshold is 2.3V. If the voltage falls below 2.3V and persists for the delay time, the battery enters undervoltage protection, discharging protection chip U2 shuts down, and transistors Q3 and Q4 are prohibited from discharging. When the voltage rises above 2.3V and persists for the delay time, the battery resumes normal operation, discharging protection chip U2 resumes, and the discharge tubes of transistors Q3 and Q4 are allowed to discharge. In the power-on state, the protection circuit's undervoltage discharge threshold is designed to be lower, allowing for fuller utilization of the silicon negative battery's capacity.

[0046] State 3: When the voltage U output by the phone's mainboard module 1 is 1.2V < U < 2.0V for 64mS, the phone enters Shipping Mode. Regardless of the voltage, protection chip U2 disables discharge, and transistors Q3 and Q4 are prohibited from discharging. When connected to a charger and exiting Shipping Mode, protection chip U2 enables discharge, and transistors Q3 and Q4 are permitted to discharge. Shipping Mode reduces battery and host power consumption, effectively preventing battery damage and swelling caused by excessive power consumption, thereby ensuring battery functionality and safety.

[0047] State 4: When the voltage U output by the mobile phone motherboard module 1 is 3.0V < U < 4.5V for 64mS, it enters shutdown mode. Regardless of the voltage, protection chip U2 disables charging and discharging, and transistors Q3 and Q4 are prohibited from charging and discharging. When the high voltage at CNT1 is removed, shutdown mode is exited, protection chip U2 enables charging and discharging, and transistors Q3 and Q4 are permitted to charge and discharge. In shutdown mode, the battery is safely assembled into the device. During assembly, the battery enters shutdown mode. Once the battery is confirmed to be normal, the shutdown state is released and the battery can be used normally, ensuring a safe and reliable assembly process. The mobile phone motherboard also provides active control. If the motherboard detects any abnormal battery conditions, such as high temperature, abnormal voltage, or current, it can proactively shut down the battery, ensuring the safety of the device and battery.

[0048] Example 2:

[0049] The difference between this embodiment and embodiment 1 is that, see Figures 3 and 4 The protection circuit of the silicon negative electrode mobile phone battery of this embodiment further includes a switching module 5 for exiting the shipping mode of the mobile phone motherboard; the switching module 5 is connected between the mobile phone motherboard module 1 and the primary protection module 2. Specifically, the switching module 5 can exit the shipping mode by connecting an external switch via the PS pin when in the shipping mode.

[0050] In some embodiments, the protection chip U2 is provided with a PS1 pin terminal; the mobile phone motherboard module 1 is provided with a PS2 pin terminal and a motherboard positive terminal P+; the battery module 3 includes a battery positive terminal B+ and a battery negative terminal B-.

[0051] Specifically, the switching module 5 includes a resistor R10 and a switch SW, the resistor R10 is connected between the PS1 pin end and the PS2 pin end, one end of the switch SW is connected between the resistor R10 and the PS2 pin end, and the other end of the switch SW is connected between the battery positive terminal B+ and the mainboard positive terminal P+.

[0052] With the above settings, when the voltage U output by the phone's mainboard module 1 is 1.2V < U < 2.0V for 64 milliseconds, the phone enters Shipping Mode. Regardless of the voltage, protection chip U2 disables discharge, and the discharge tubes of transistors Q3 and Q4 are prohibited from discharging. When pin PS1 is connected to an external switch SW via resistor R10 and switch SW is pressed, pin PS2 is pulled high to the mainboard's positive terminal P+, exiting Shipping Mode. Protection chip U2 then enables discharge, allowing the discharge tubes of transistors Q3 and Q4 to discharge. This method allows for a physical button-based exit from Shipping Mode, making it simple and convenient.

[0053] Example 3:

[0054] The difference between this embodiment and embodiment 2 is that, see Figures 5 and 6 The protection circuit of the silicon negative electrode mobile phone battery in this embodiment further includes a secondary protection module 6 , which is connected between the primary protection module 2 and the battery module 3 .

[0055] Specifically, the secondary protection module 6 includes a protection chip U1 , a transistor Q1 , and a transistor Q2 connected in parallel.

[0056] Through the configuration of the aforementioned secondary protection module 6, protection chip U1 controls the parallel-connected transistors Q1 and Q2 to provide overvoltage, undervoltage, charge-discharge overcurrent, and short-circuit protection. Its protection level is lower than that of protection chip U2, meaning that protection chip U2 takes precedence. When protection chip U2 fails, protection chip U1 takes over. For primary protection module 2, transistors Q3 and Q4 are connected in parallel as primary protection, controlled by protected chip U2 to provide overvoltage, undervoltage, charge-discharge overcurrent, and short-circuit protection. The combination of primary protection module 2 and secondary protection module 6 achieves dual-layer protection for the mobile phone motherboard, effectively ensuring battery safety.

[0057] In some embodiments, the protection circuit of the silicon negative electrode mobile phone battery further includes a communication authentication module 7, which is connected between the mobile phone motherboard module 1 and the primary protection module 2. Specifically, the communication authentication module 7 includes an anti-counterfeiting chip U3, which has encryption and storage functions, and performs communication authentication with the mobile phone motherboard module 1. Only after the battery is identified and confirmed can it power the mobile phone motherboard.

[0058] The protection circuit for a silicon-negative mobile phone battery in this utility model utilizes a secondary protection module 6 in conjunction with a primary protection module 2 to provide dual protection for the mobile phone motherboard. Furthermore, a communication authentication module 7 performs communication authentication with the mobile phone motherboard, enabling encryption and storage functions. Power is only supplied to the mobile phone motherboard after identification and confirmation, ensuring power supply security.

[0059] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0060] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0061] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0062] In the present invention, unless otherwise expressly specified or limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0063] Although the present invention has been described with reference to the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and variations based on the above content. Therefore, all such substitutions, modifications and variations are included within the spirit and scope of the appended claims.

Claims

1. A protection circuit for a silicon negative electrode mobile phone battery, characterized in that: include Mobile phone motherboard module, used for data transmission and sharing; A primary protection module, connected to the mobile phone motherboard module, for protecting the mobile phone motherboard from overvoltage, undervoltage, charge and discharge overcurrent, and short circuit; A battery module, connected to the primary protection module, for providing power to the mobile phone motherboard; as well as The undervoltage and overdischarge protection module is connected between the mobile phone mainboard module and the primary protection module. According to the different voltages output by the mobile phone mainboard module, the primary protection module enters or exits different undervoltage and overdischarge protection values.

2. The protection circuit of the silicon negative electrode mobile phone battery according to claim 1, characterized in that: The primary protection module includes a protection chip U2, a transistor Q4 and a triode Q4 connected in parallel, and the protection chip U2 is provided with a CNT1 terminal.

3. The protection circuit of the silicon negative electrode mobile phone battery according to claim 2, characterized in that: The mobile phone mainboard module is provided with a CNT2 terminal; The undervoltage and overdischarge protection module is connected between the CNT1 terminal and the CNT2 terminal.

4. The protection circuit of the silicon negative electrode mobile phone battery according to claim 3, characterized in that: The undervoltage and overdischarge protection module includes a resistor R5 connected between the CNT1 terminal and the CNT2 terminal.

5. The protection circuit of the silicon negative electrode mobile phone battery according to claim 2, characterized in that: The protection circuit of the silicon negative electrode mobile phone battery also includes a switching module for exiting the shipping mode of the mobile phone motherboard; The switching module is connected between the mobile phone mainboard module and the primary protection module.

6. The protection circuit of the silicon negative electrode mobile phone battery according to claim 5, characterized in that: The protection chip U2 is provided with a PS1 pin terminal; the mobile phone motherboard module is provided with a PS2 pin terminal and a motherboard positive terminal P+; The battery module includes a battery positive terminal B+ and a battery negative terminal B-.

7. The protection circuit of the silicon negative electrode mobile phone battery according to claim 6, characterized in that: The switching module includes a resistor R10 and a switch SW, the resistor R10 is connected between the PS1 pin end and the PS2 pin end, one end of the switch SW is connected between the resistor R10 and the PS2 pin end, and the other end of the switch SW is connected between the battery positive terminal B+ and the mainboard positive terminal P+.

8. The protection circuit of a silicon negative electrode mobile phone battery according to any one of claims 1 to 7, characterized in that: The protection circuit of the silicon negative electrode mobile phone battery further includes a secondary protection module, which is connected between the primary protection module and the battery module.

9. The protection circuit of the silicon negative electrode mobile phone battery according to claim 8, characterized in that: The secondary protection module includes a protection chip U1, a transistor Q1 and a transistor Q2 connected in parallel.

10. The protection circuit of a silicon negative electrode mobile phone battery according to any one of claims 1 to 7, characterized in that: The protection circuit of the silicon negative electrode mobile phone battery further includes a communication authentication module, which is connected between the mobile phone mainboard module and the primary protection module.

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