CN118232480A - Charging protection circuit and lithium battery system - Google Patents

Abstract

The embodiment of the invention discloses a charging protection circuit and a lithium battery system, wherein the charging protection circuit is applied to a lithium battery and mainly comprises a control IC (integrated circuit), an MOS (metal oxide semiconductor) tube, a FUSE (functional unit) and a resistance element, wherein the control IC is provided with a plurality of pins for monitoring voltage, current, temperature and the like and receiving external setting parameters, the MOS tube is responsible for cutting off or conducting a charging loop according to a control signal, and the FUSE cuts off the connection between a power supply and the battery when the current is overloaded. The invention ensures the safety of the lithium battery in the charging process through real-time monitoring and multiple protection mechanisms. Meanwhile, the circuit can be provided with a communication interface, so that the communication with external equipment and the flexible adjustment of charging parameters are realized, and the intellectualization and the adaptability of the system are improved.

Description

Charging protection circuit and lithium battery system

Technical Field

The embodiment of the invention relates to the technical field of battery charging, in particular to a charging protection circuit and a lithium battery system.

Background

With the popularity of portable electronic devices, lithium batteries are becoming increasingly popular as a high-efficiency, reusable energy storage device. However, if the voltage or current is controlled improperly during the charging process of the lithium battery, the battery may be overcharged, overdischarged or shorted, and thus the battery may be damaged and even a safety accident may be caused. Therefore, it is important to design a charge protection circuit capable of effectively protecting the safety of the lithium battery.

Conventional lithium battery charge protection circuits generally include voltage and current detection elements, control elements, switching elements, and the like. Although the circuits can protect the safety of the lithium battery to a certain extent, the circuits have the defects of low response speed, low control precision, single function and the like. In order to overcome the problems, the invention provides a novel lithium battery charging protection circuit.

The above information disclosed in this background section is only for enhancement of understanding of the background of the inventive concept and, therefore, may contain information that does not form the prior art that is already known to those of ordinary skill in the art in this country.

Disclosure of Invention

The disclosure is in part intended to introduce concepts in a simplified form that are further described below in the detailed description. The disclosure is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to limit the scope of the claimed subject matter.

In a first aspect, some embodiments of the present disclosure provide a charge protection circuit applied to a lithium battery, the charge protection circuit comprising:

The control IC comprises a plurality of pins, wherein the pins comprise a voltage monitoring pin, a current detecting pin, a control signal output pin, a reference voltage pin, a temperature detecting pin and a pin for receiving external setting parameters, the voltage monitoring pin is connected with the anode and the cathode of the lithium battery to acquire the voltage value of the lithium battery in real time, and the current detecting pin is connected with a charging loop of the lithium battery to detect the current in the charging loop; the MOS tube comprises a source electrode, a drain electrode and a grid electrode, wherein the source electrode and the drain electrode are respectively connected to the anode and the cathode of the lithium battery, the grid electrode is connected with a control signal output pin of the control IC, and when the control IC detects that the voltage or the current is abnormal, a closing signal is sent to the grid electrode of the MOS tube through the control signal output pin so as to cut off a charging loop; the FUSE is connected in series in the charging loop, one end of the FUSE is connected to the positive electrode of the charging power supply, the other end of the FUSE is connected to the source electrode or the drain electrode of the MOS tube, and when the current in the charging loop exceeds a preset value, the FUSE is fused to cut off the connection between the charging power supply and the lithium battery; and the resistor element is connected between the reference voltage pin of the control IC and an external power supply and provides required working voltage for the control IC.

Optionally, the control IC further includes a delay processing circuit, where the delay processing circuit is configured to start a delay function after the voltage reaches or exceeds a preset overcharge cutoff voltage, and control the MOS transistor to be turned off through the control signal output pin after a preset delay time.

Optionally, the charging protection circuit further includes a discharging loop and a discharging control switch, when the voltage of the lithium battery is lower than a preset overdischarge cut-off voltage, the control IC controls the discharging control switch to be turned off through the control signal output pin so as to cut off the discharging loop of the lithium battery.

Optionally, the control IC further includes a maximum current limiting circuit, where the maximum current limiting circuit is configured to receive a preset maximum charging current value through the external setting parameter receiving pin, and adjust, when the detected charging current reaches or exceeds the preset maximum charging current value, the conduction degree of the MOS transistor through the control signal output pin.

Optionally, the maximum current limiting circuit is further configured to output a warning signal when the detected charging current is close to the preset maximum charging current value.

Optionally, the charging protection circuit further includes: and a temperature sensor connected to the temperature detection pin of the control IC and configured to detect the temperature of the lithium battery in real time. Optionally, the control IC is further configured to: and closing the MOS tube through the control signal output pin when the temperature detected by the temperature sensor exceeds a preset safe temperature range so as to cut off the charging loop.

Optionally, the charging protection circuit further includes: and the communication interface is configured to communicate with the external equipment so as to receive a charging parameter adjustment instruction sent by the external equipment.

In a second aspect, some embodiments of the present disclosure provide a lithium battery system comprising a lithium battery; and a charge protection circuit as described in any one of the embodiments of the first aspect above.

The above embodiments of the present disclosure have the following advantageous effects: the charging protection circuit and the application thereof in a specific lithium battery system realize the comprehensive monitoring and protection of the charging process of the lithium battery through innovative circuit design and control strategy. The invention not only improves the safety and reliability of the lithium battery, but also provides more convenient and efficient charging experience for users. Meanwhile, the implementation of the invention promotes the development and innovation of battery charging technology, and provides new ideas and methods for the research and application of related fields.

Drawings

The above and other features, advantages, and aspects of embodiments of the present disclosure will become more apparent by reference to the following detailed description when taken in conjunction with the accompanying drawings. The same or similar reference numbers will be used throughout the drawings to refer to the same or like elements. It should be understood that the figures are schematic and that elements and components are not necessarily drawn to scale.

Fig. 1 is a schematic diagram of a charge protection circuit according to an embodiment of the present invention;

fig. 2 is a functional block diagram of a lithium battery system according to an embodiment of the present invention.

Detailed Description

Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It should be understood that the drawings and embodiments of the present disclosure are for illustration purposes only and are not intended to limit the scope of the present disclosure.

It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings. Embodiments of the present disclosure and features of embodiments may be combined with each other without conflict.

It should be noted that the terms "first," "second," and the like in this disclosure are merely used to distinguish between different devices, modules, or units and are not used to define an order or interdependence of functions performed by the devices, modules, or units.

It should be noted that references to "one", "a plurality" and "a plurality" in this disclosure are intended to be illustrative rather than limiting, and those of ordinary skill in the art will appreciate that "one or more" is intended to be understood as "one or more" unless the context clearly indicates otherwise.

The names of messages or information interacted between the various devices in the embodiments of the present disclosure are for illustrative purposes only and are not intended to limit the scope of such messages or information.

The present disclosure will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Fig. 1 illustrates a schematic diagram of some embodiments of a charge protection circuit according to the present disclosure. The charge protection circuit includes:

The control IC1 comprises a plurality of pins, wherein the pins comprise a voltage monitoring pin 11, a current detection pin 12, a control signal output pin 13, a reference voltage pin 14, a temperature detection pin 16 and a receiving external setting parameter pin 15, the voltage monitoring pin 11 is connected with the anode and the cathode of the lithium battery 6 to acquire the voltage value of the lithium battery in real time, and the current detection pin 12 is connected with a charging loop of the lithium battery 6 to detect the current in the charging loop;

In some embodiments, the control IC1 is a brain of the whole protection circuit, and is provided with a plurality of pins for voltage monitoring, current detection, control signal output, reference voltage input, temperature detection and receiving external set parameters, wherein the voltage monitoring pin 14 is connected with the anode and the cathode of the lithium battery 6, and the voltage value of the lithium battery 6 is obtained in real time. The control IC1 can determine whether the lithium battery 6 is in an overcharged or overdischarged state by means of an internal comparator, and the current detection pin 12 is connected to a charging circuit of the lithium battery 6 to detect the current in the charging circuit. If the current exceeds the preset value, the control IC1 takes corresponding protection measures, and the control signal output pin is used for sending an on-off signal to the MOS tube 2 so as to control the on-off of the charging loop.

The MOS tube 2 comprises a source electrode 21, a drain electrode 22 and a grid electrode 23, wherein the source electrode 21 and the drain electrode 22 are respectively connected to the anode and the cathode of the lithium battery 6, the grid electrode 23 is connected with a control signal output pin 13 of the control IC1, and when the control IC1 detects that the voltage or the current is abnormal, a closing signal is sent to the grid electrode 23 of the MOS tube 2 through the control signal output pin 13 so as to cut off a charging loop;

In some embodiments, the MOS transistor 2 is used as a switching element, and the source 21 and the drain 22 thereof are respectively connected to the positive and negative electrodes of the lithium battery 6. When the MOS tube is conducted, the charging loop is closed, and the lithium battery 6 starts to be charged; when the MOS transistor 2 is turned off, the charging circuit is turned off, the charging is stopped, and the gate 23 is connected to the control signal output pin 13 of the control IC 1. When the control IC1 detects that the voltage or the current is abnormal, a closing signal is sent to the grid electrode of the MOS tube through the control signal output pin so as to cut off the charging loop.

FUSE3, connected in series in the charging circuit, one end of which is connected to the positive electrode of the charging power supply 5, and the other end is connected to the source 21 or the drain 22 of the MOS transistor 2, when the current in the charging circuit exceeds a preset value, FUSE3 will be fused to cut off the connection between the charging power supply 5 and the lithium battery 6;

In some embodiments, FUSE3 is a FUSE connected in series in the charging loop. One end of the FUSE3 is connected to the positive electrode of the charging power supply 5, the other end of the FUSE3 is connected to the source electrode 21 or the drain electrode 22 of the MOS tube 2, and when the current in the charging loop exceeds the rated value of the FUSE3, the FUSE3 is quickly fused, so that the connection between the charging power supply 5 and the lithium battery 6 is cut off. This provides a double guarantee for preventing safety problems caused by overcharging or short-circuiting of the battery.

The resistor element 4 is connected between the reference voltage pin 14 of the control IC1 and the external power supply 7, and provides a required operating voltage for the control IC 1.

In some embodiments, the resistor element 4 is connected between the reference voltage pin 14 of the control IC1 and the external power supply 7, and provides the required operating voltage for the control IC 1. The resistance value of the resistor element 4 is set appropriately according to the voltage of the external power supply 7 and the operating voltage range of the control IC, and the control IC1 can be ensured to operate stably and reliably under various operating conditions by the voltage-reducing action of the resistor element 4.

Specifically, during the charging process of the lithium battery, the working flow of the charging protection circuit is as follows: the control IC1 monitors the voltage of the lithium battery 6 and the current of the charging loop in real time; when the voltage reaches or exceeds a preset overcharge cutoff voltage, the control IC1 starts the delay processing circuit. After a preset delay time, if the voltage is still too high, the control IC1 closes the MOS tube 2 through the control signal output pin 13 to cut off the charging loop; when the current detection pin 12 detects that the current in the charging loop exceeds the preset value, the control IC1 first tries to limit the current by adjusting the conduction degree of the MOS transistor 2. If the current continuously exceeds the preset value or is close to the preset maximum charging current value, the control IC1 closes the MOS tube 2 and outputs a warning signal; FUSE3 is used as a final safety guarantee, and is quickly fused when the current seriously exceeds a preset value, and the connection between the charging power supply 5 and the lithium battery 6 is cut off; the resistive element 4 always provides a stable operating voltage for the control IC1, ensuring reliable operation under various operating conditions. By the specific embodiment, the charging protection circuit for the lithium battery 6 can effectively protect the safety of the lithium battery 6 in the charging process and prevent the problems of overcharge, overcurrent and the like.

In some embodiments, the control IC1 further includes a delay processing circuit 10, where the delay processing circuit 10 is configured to start a delay function after the voltage reaches or exceeds a preset overcharge cutoff voltage, and control the MOS transistor to be turned off through the control signal output pin 13 after a preset delay time.

In some embodiments, the delay processing circuit 10 is part of the control IC1, and is mainly used to provide a delay function when the voltage of the lithium battery reaches or exceeds a preset overcharge cutoff voltage, so as to prevent the transient voltage fluctuation from false triggering the protection mechanism. When the voltage of the lithium battery 6 increases to near or above its allowable maximum during charging, this may cause damage to the battery. The function of the delay processing circuit 10 is not to immediately shut off the charging circuit when such an overcharge condition is detected, but to first initiate a delay function. In some cases, the voltage of the battery may rise instantaneously due to temporary load changes or other factors. The delay processing circuit 10 can distinguish between such transient voltage fluctuations and a real overcharge condition, thereby avoiding false triggering of the protection mechanism.

In some embodiments, the voltage monitoring pin 11 of the control IC1 continuously monitors the voltage of the lithium battery 6. When the voltage reaches or exceeds a preset overcharge cutoff voltage, the delay processing circuit is activated. Once the delay processing circuit 10 is activated, it starts a predetermined delay period. This delay period may be set according to the specific application requirements and battery characteristics, after which the delay processing circuit 10 will again check the voltage of the lithium battery. If the voltage is still higher than the overcharge cutoff voltage, the control IC1 turns off the MOS transistor 2 through the control signal output pin, thereby cutting off the charging loop. If the voltage has fallen within the safe range, the charging process will continue. By avoiding false triggering due to transient voltage fluctuation, the delay processing circuit 10 can ensure that the charging process is not interrupted when not needed, thereby improving the charging efficiency, and simultaneously, the delay processing circuit can timely cut off the charging loop when the real overcharge condition occurs, so as to protect the lithium battery from damage.

In some embodiments, the charge protection circuit further includes a discharge loop and a discharge control switch, and when the voltage of the lithium battery is lower than the preset overdischarge cut-off voltage, the control IC1 controls the discharge control switch to be turned off through the control signal output pin 12 so as to cut off the discharge loop of the lithium battery 6.

In some embodiments, a discharge loop and a discharge control switch are added to realize the protection of the discharge process of the lithium battery. During discharge of a lithium battery, if the voltage is too low, damage to the battery or an impact on the battery life may occur. The discharging loop and the discharging control switch are used for cutting off the discharging loop of the battery when the battery voltage is detected to be lower than the preset overdischarge cut-off voltage, so that the battery is protected. The discharge control switch is a key component of a discharge loop, and the on-off state of the discharge control switch is controlled by the control IC through a control signal output pin. When the voltage of the battery is normal, the discharge control switch keeps a closed state, and the battery is allowed to be normally discharged; when the battery voltage is too low, the discharge control switch is turned off to cut off the discharge circuit.

In some embodiments, similar to the charging process, the voltage monitoring pin 11 of the control IC1 also continuously monitors the discharge voltage of the lithium battery, and when the control IC detects that the battery voltage is lower than the preset overdischarge cutoff voltage, it sends a shutdown signal to the discharge control switch through the control signal output pin, and the discharge control switch immediately opens after receiving the shutdown signal, so as to cut off the discharge loop of the lithium battery 6. This may prevent the battery from continuing to discharge and possibly causing damage. Through timely cutting off the discharge loop, the discharge protection circuit can effectively prevent the lithium battery from being damaged due to overdischarge, avoids the overdischarge to be helpful for prolonging the service life of the lithium battery and keeping the performance stable, and for equipment which depends on the lithium battery for power supply, the discharge protection circuit can also improve the overall reliability and stability of the equipment.

In some embodiments, the control IC1 further includes a maximum current limiting circuit 8 configured to receive a preset maximum charging current value through the receiving external setting parameter pin 15, and adjust the conduction degree of the MOS transistor 2 through the control signal output pin 13 when the detected charging current reaches or exceeds the preset maximum charging current value.

It should be noted that, the main function of the maximum current limiting circuit 8 in the charging protection circuit is to ensure that the lithium battery does not exceed the preset maximum charging current value during the charging process, so as to prevent the battery from being damaged due to overcurrent. When the lithium battery is charged, if the current is too large, internal short circuit, heat generation and even explosion of the battery can be caused. The maximum current limiting circuit 8 serves to monitor the charging current and to take action to limit the current or to cut off the charging circuit when it reaches or exceeds a preset maximum value. By receiving the external setting parameter pin 15, the maximum current limiting circuit 8 can flexibly set the maximum charging current value according to different lithium battery specifications or charging requirements. The current detection pin of the control IC1 can monitor the current of the lithium battery charging loop in real time. The maximum current limiting circuit 8 is started immediately when the detected charging current reaches or exceeds the maximum charging current value preset by the receiving external setting parameter pin 15. It will first try to adjust the conduction degree of the MOS transistor 2 through the control signal output pin 13, so as to limit the magnitude of the charging current. If the adjustment is not effective to reduce the current or the current continues to approach the preset maximum value, the control IC1 outputs a warning signal and may finally turn off the MOS transistor 2 to cut off the charging circuit. By monitoring and limiting the charging current in real time, the maximum current limiting circuit may significantly reduce the risk of damage to the lithium battery due to over-current. The circuit can be suitable for lithium battery charging scenes with different specifications and requirements because the circuit can receive external setting parameters to set the maximum charging current value. And when the current approaches to the preset maximum value, a warning signal is output, so that the user is provided with an opportunity to take further measures in time.

In some embodiments, the maximum current limiting circuit 8 is further configured to output a warning signal when the detected charging current is close to the preset maximum charging current value.

Specifically, the maximum current limiting circuit 8 functions as an operation when the detected charging current approaches a preset maximum charging current value. This requirement emphasizes the early warning function of the circuit to enhance the user's safety perception and response capabilities. When the charging current is close to the preset maximum value, warning signals are sent in advance, so that a user or a charging management system can have enough time to take preventive measures, and the occurrence of overcurrent is avoided. Through the pre-warning function, the user may take action, such as reducing charging power, suspending charging, or checking the charging device and battery status, before the battery is potentially damaged. The maximum current limiting circuit 8 continuously monitors the charging current through the lithium battery and compares it with a preset maximum charging current value. The circuit recognizes this critical state when the monitored current approaches (but has not reached) a preset maximum value. Once it is determined that the current is close to the preset threshold, the control IC1 outputs a warning signal via the corresponding pin or communication interface. This signal may be a voltage change, a specific digital code or a message sent via a communication protocol. Upon receiving the warning signal, the user or the charge management system may take appropriate action, such as adjusting the charge parameters, checking the connection, or interrupting the charging process.

In some embodiments, the control IC1 may drive an LED lamp or display screen to display a warning message, such as a flashing light or text prompt. The circuit may trigger a buzzer or speaker to sound an alarm. If the charge protection circuit is integrated with a communication interface, the control IC1 can transmit a warning message to an external device or a charge management system through the interface. By pre-warning, the user or system can take action before the potential problem is escalated, thereby avoiding more serious consequences. The early warning threshold can be flexibly set according to different application scenes and safety requirements. The warning is provided by visual, audible or digital communication means so that the user can easily recognize and take corresponding measures.

In some embodiments, the charge protection circuit further comprises: a temperature sensor 9, connected to the temperature detection pin 16 of the control IC1, is configured to detect the temperature of the lithium battery 6 in real time.

In some embodiments, a temperature sensor 9 is mounted in place on the lithium battery 6 to ensure that the temperature change of the battery can be accurately sensed. The output end of the temperature sensor is connected with a temperature detection pin 16 of the control IC1, and a temperature signal detected in real time is transmitted to the control IC1. The temperature sensor 9 converts the detected temperature into electrical signals (e.g., changes in voltage or resistance values), which are then read and processed by the control IC1. The control IC1 typically contains an analog-to-digital converter (ADC) and corresponding processing algorithms inside it for converting the analog temperature signal into a digital format and performing the necessary temperature compensation and calibration. The control IC1 compares the processed temperature data with a preset safe temperature range. If the detected temperature exceeds the preset value, the control IC1 closes the MOS tube 2 through the control signal output pin 13, thereby cutting off the charging loop. Meanwhile, the control IC1 may also send a warning message to the external device through the communication interface, reminding the user or manager to pay attention to the battery status. By monitoring the temperature in real time and taking corresponding protective measures, the temperature sensor 9 can significantly reduce the risk of safety accidents of the lithium battery 6 due to overheating. Controlling charging in a safe temperature range helps to extend the life of the lithium battery and maintain its performance stable. For systems that rely on lithium battery power, the inclusion of the temperature sensor 9 can improve the reliability and stability of the overall system.

In some embodiments, the control IC1 is further configured to: and when the temperature detected by the temperature sensor 9 exceeds a preset safety temperature range, the MOS tube 2 is closed through the control signal output pin so as to cut off a charging loop.

In particular, to further enhance the intelligent functionality of the charge protection circuit, more sophisticated control strategies and fault diagnostics are implemented, in particular by the introduction of microprocessors or Programmable Logic Controllers (PLCs). The microprocessor or the PLC can execute more complex algorithm and logic judgment, thereby realizing finer control of the charging process, including collaborative management of multiple parameters such as charging current, voltage, temperature and the like. The intelligent controllers can monitor the states of all components of the charging protection circuit, discover faults in time and perform corresponding processing, such as outputting fault codes, starting a standby circuit or executing a safety shutdown program.

In some embodiments, the microprocessor or PLC receives data signals from current sensors, voltage sensors, temperature sensors, etc. through its input ports and performs the necessary analog-to-digital conversion and preprocessing. Based on a preset control algorithm and logic judgment, the microprocessor or the PLC adjusts charging parameters in real time, so that the lithium battery is ensured to be charged under safe and efficient conditions. By monitoring the state and performance of the circuit components, the microprocessor or the PLC can timely find abnormal conditions and respond according to a preset fault processing strategy, such as outputting warning information, adjusting a charging mode or cutting off a charging loop. The microprocessor or PLC is also typically equipped with a communication interface, such as UART, SPI, I C or ethernet, for data transmission and instruction interaction with external devices or host computers. By introducing a microprocessor or a PLC, the charging protection circuit can realize higher-level intelligent control, and the charging efficiency and the charging safety are improved. The intelligent controller is easy to program and configure, can adapt to the charging requirements of lithium batteries with different specifications and types, and is convenient for expanding and upgrading future functions. The fault diagnosis function of the microprocessor or the PLC can obviously reduce the cost of manual inspection and maintenance and improve the availability and reliability of the system.

In some embodiments, the charge protection circuit further comprises: and a communication interface 17 configured to communicate with an external device to receive a charging parameter adjustment instruction transmitted by the external device.

The implementation of the function of the communication interface 17 requires cooperation between the wireless communication technology and the internet connection. The key parameters such as the charging state, the temperature, the current, the voltage and the like of the lithium battery can be known in real time through remote monitoring no matter where the user is located. The user or manager can adjust the charging parameters, start or stop the charging process, and even perform operations such as fault diagnosis, remote restarting and the like through remote sending instructions. The remote monitoring and control function may respond quickly, such as by cutting off the charging circuit or notifying the user, when a potential safety problem is detected, thereby minimizing damage.

In some embodiments, the sensor and control IC1 in the charging protection circuit is responsible for collecting various parameters of the lithium battery 6 and transmitting these data to a remote monitoring platform or user equipment in real time via a wireless communication module (e.g., wi-Fi, bluetooth, 4G/5G, etc.). The wireless communication module is also responsible for receiving control instructions from a remote monitoring platform or user equipment and transmitting the instructions to the control IC1. The control IC1 adjusts the charging parameters or performs the corresponding operations according to the instruction contents. To ensure security of data transmission and instruction execution, remote monitoring and control functions also typically employ data encryption and authentication techniques to prevent data leakage and illegal access. The user can download dedicated smart mobile phone APP, look over lithium battery state and carry out remote control in real time through APP. A manager or professional user may implement more complex monitoring and control functions by accessing a particular web page platform. The charging protection circuit can also provide an API interface or an SDK so as to integrate with a third party system such as an intelligent home system, an energy management system and the like. The user can know and control the charging state of the lithium battery at any time and any place without going to the site. When a security problem occurs, the remote monitoring and control function can respond quickly, reducing potential damage. With the continuous development of wireless communication technology and the Internet, the remote monitoring and control function can realize more innovation and value-added services.

The above embodiments of the present disclosure have the following advantageous effects: by introducing multiple protection mechanisms, such as maximum current limit, temperature monitoring, remote monitoring and control functions, the safety of the lithium battery charging process is remarkably enhanced. The protection measures can effectively prevent the battery from being damaged or safety accidents from occurring due to abnormal conditions such as overcurrent and overtemperature, thereby ensuring the safety of users and equipment. By optimizing the charging strategy and introducing intelligent control, the charging efficiency of the lithium battery is improved.

With further reference to fig. 2, as an implementation of the charge protection circuit shown in the above figures, the present disclosure provides some embodiments of a lithium battery system that correspond to the charge protection circuit embodiment shown in fig. 1.

As shown in fig. 2, a lithium battery system 200 includes: a lithium battery 201; and a charge protection circuit 202 configured to protect the lithium battery during charging.

It will be appreciated that the lithium battery and charge protection circuit described in the lithium battery system corresponds to the charge protection circuit described with reference to fig. 1, and that the lithium battery and charge protection circuit are integrated. Since the lithium battery system includes the charge protection circuit provided by any of the embodiments of the present invention, the lithium battery system also has the beneficial effects described in any of the embodiments above.

The functions described above herein may be performed, at least in part, by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: a Field Programmable Gate Array (FPGA), an Application Specific Integrated Circuit (ASIC), an Application Specific Standard Product (ASSP), a system on a chip (SOC), a Complex Programmable Logic Device (CPLD), and the like.

The flowcharts and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

The foregoing description is only of the preferred embodiments of the present disclosure and description of the principles of the technology being employed. It will be appreciated by those skilled in the art that the scope of the invention in the embodiments of the present disclosure is not limited to the specific combination of the above technical features, but encompasses other technical features formed by any combination of the above technical features or their equivalents without departing from the spirit of the invention. Such as the above-described features, are mutually substituted with (but not limited to) the features having similar functions disclosed in the embodiments of the present disclosure.

Claims (9)

1. A charge protection circuit for a lithium battery, comprising:

The control IC comprises a plurality of pins, wherein the pins comprise a voltage monitoring pin, a current detecting pin, a control signal output pin, a reference voltage pin, a temperature detecting pin and a pin for receiving external setting parameters, the voltage monitoring pin is connected with the anode and the cathode of the lithium battery to acquire the voltage value of the lithium battery in real time, and the current detecting pin is connected with a charging loop of the lithium battery to detect the current in the charging loop;

The MOS tube comprises a source electrode, a drain electrode and a grid electrode, wherein the source electrode and the drain electrode are respectively connected to the anode and the cathode of the lithium battery, the grid electrode is connected with a control signal output pin of the control IC, and when the control IC detects that the voltage or the current is abnormal, a closing signal is sent to the grid electrode of the MOS tube through the control signal output pin so as to cut off a charging loop;

the FUSE is connected in series in the charging loop, one end of the FUSE is connected to the positive electrode of the charging power supply, the other end of the FUSE is connected to the source electrode or the drain electrode of the MOS tube, and when the current in the charging loop exceeds a preset value, the FUSE is fused to cut off the connection between the charging power supply and the lithium battery;

And the resistor element is connected between the reference voltage pin of the control IC and an external power supply and provides required working voltage for the control IC.

2. The charge protection circuit of claim 1, wherein the control IC further comprises a delay processing circuit configured to start a delay function after the voltage reaches or exceeds a preset overcharge cutoff voltage, and to control the MOS transistor to be turned off through the control signal output pin after a preset delay time.

3. The charge protection circuit of claim 1, further comprising a discharge loop and a discharge control switch, wherein the control IC controls the discharge control switch to close through the control signal output pin to cut off the discharge loop of the lithium battery when the voltage of the lithium battery is lower than a preset overdischarge cut-off voltage.

4. The charge protection circuit of claim 1, wherein the control IC further comprises a maximum current limiting circuit configured to receive a preset maximum charge current value through the receive external set parameter pin and adjust the degree of conduction of the MOS transistor through the control signal output pin when the detected charge current reaches or exceeds the preset maximum charge current value.

5. The charge protection circuit of claim 4, wherein the maximum current limiting circuit is further configured to output a warning signal when the detected charge current is near the preset maximum charge current value.

6. The charge protection circuit of claim 1, further comprising:

And a temperature sensor connected to the temperature detection pin of the control IC and configured to detect the temperature of the lithium battery in real time.

7. The charge protection circuit of claim 6, wherein the control IC is further configured to:

And closing the MOS tube through the control signal output pin when the temperature detected by the temperature sensor exceeds a preset safe temperature range so as to cut off the charging loop.

8. The charge protection circuit of any one of claims 1-7, further comprising:

And the communication interface is configured to communicate with the external equipment so as to receive a charging parameter adjustment instruction sent by the external equipment.

9. A lithium battery system, comprising:

A lithium battery; and

The charge protection circuit of any one of claims 1 to 8, configured to protect safety of the lithium battery during charging.