CN109659998B - Battery protection circuit, protection method and wearable device - Google Patents
Battery protection circuit, protection method and wearable device Download PDFInfo
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- CN109659998B CN109659998B CN201910005512.XA CN201910005512A CN109659998B CN 109659998 B CN109659998 B CN 109659998B CN 201910005512 A CN201910005512 A CN 201910005512A CN 109659998 B CN109659998 B CN 109659998B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/443—Methods for charging or discharging in response to temperature
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0036—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using connection detecting circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Protection Of Static Devices (AREA)
Abstract
The invention discloses a battery protection circuit, a protection method and wearable equipment, wherein the battery protection circuit comprises a switch circuit and a differential processing circuit, one end of the switch circuit is connected with the ground end of a battery and is connected with a first differential signal end of a control module, a second differential signal end of the control module is connected with a system ground end, the control module receives alternating current differential signals from the ground end and the system ground end of the battery, calculates the phase difference of the alternating current differential signals, inquires a relation table between the phase difference and the internal temperature of the battery according to the phase difference to obtain the internal temperature of the battery, and executes battery protection action according to the internal temperature condition of the battery. The battery protection circuit has high detection accuracy on the internal temperature of the battery, responds timely, can effectively protect the battery and a system, and avoids the occurrence of safety hazard events caused by overhigh temperature of the battery.
Description
Technical Field
The invention relates to a protection circuit, in particular to a battery protection circuit, a protection method and wearable equipment.
Background
Lithium batteries are now widely used in mobile communication, automobiles, measuring equipment and other fields, which makes people pay more attention to the safety of lithium batteries, and various safety problems occur due to the temperature runaway of lithium batteries caused by various configurations and connections outside or inside the batteries. Rapid changes in the internal temperature of the battery often occur in the range of milliseconds to tens of seconds. Severe temperature changes may lead to shutdown or rupture of the separator layer, and aging of the electrolyte may thus increase the release of more heat, eventually leading to temperature runaway. Conventional battery temperature measurement commonly uses an external thermometer to measure the surface temperature of the battery. Generally, the surface temperature of the battery is a result of low-pass filtering of the internal temperature of the battery, so it is difficult to respond to rapid changes in the internal temperature of the battery in time. According to current research, the separator layer may generally be dangerous at a cell temperature of 70 degrees celsius, and may be more susceptible to damage, particularly when the cell is at a high SOC (state of charge).
The charging process of the battery is roughly divided into three stages of trickle, constant current and constant voltage, the constant current charging stage is the stage in which the electric quantity of the battery of the equipment rises most quickly, and the charger outputs current with a fixed value to the terminal equipment where the battery is located for charging until the battery is in a state of being fully charged. If a terminal device running a high power application (such as playing games, picking up images, browsing web pages, playing videos online, etc.) is charged, the charging current is superposed on the consumed current generated by the portable terminal running the high power application, which may cause the temperature of the battery, the CPU and the PMU (power management unit) of the portable terminal to rise sharply, resulting in the portable terminal being scalded. Various abnormal conditions can occur when the mobile terminal device works at high temperature, such as: crash, restart, etc.
Disclosure of Invention
The invention provides a battery protection circuit for solving the technical problems of low detection precision and slow response of the conventional battery temperature detection circuit, and can solve the problems.
In order to solve the technical problems, the invention adopts the following technical scheme:
a battery protection circuit comprises a switch circuit, wherein one end of the switch circuit is connected with the ground end of a battery, the other end of the switch circuit is connected with a first differential signal end of a control module, a second differential signal end of the control module is connected with a system ground end, the control module receives alternating current differential signals from the ground end and the system ground end of the battery, calculates the phase difference of the alternating current differential signals, inquires a relation table between the phase difference and the internal temperature of the battery according to the phase difference, obtains the internal temperature of the battery, and executes battery protection action according to the internal temperature condition of the battery.
Further, the switch circuit comprises a discharge protection switch and a first capacitor connected in parallel with the discharge protection switch, and a control end of the discharge protection switch is connected with the control module.
Furthermore, the discharge protection switch is an NMOS tube, a gate of the NMOS tube is connected to the control module, a source of the NMOS tube is connected to the differential processing circuit, and a drain of the NMOS tube is connected to the ground of the battery.
Furthermore, the circuit also comprises a differential processing circuit, one path of the differential processing circuit is connected between the switch circuit and the first differential signal end of the control module, and the other path of the differential processing circuit is connected between a system ground end and the second differential signal end of the control module.
Furthermore, the differential processing circuit comprises a common-mode inductor, a first input end of the common-mode inductor is connected with the switch circuit, a second input end of the common-mode inductor is connected with the system ground, a first output end of the common-mode inductor is connected with a first differential signal end of the control module, a second output end of the common-mode inductor is connected with a second differential signal end of the control module, a first resistor is connected between the first input end and the second input end of the common-mode inductor, and the first output end and the second output end of the common-mode inductor are respectively connected with the system ground through a capacitor.
The invention also provides a battery protection method, which comprises the battery protection circuit described in any one of the above paragraphs,
the battery provides direct current for a load circuit through a battery power supply loop, and the battery protection method comprises the following steps:
detecting the battery temperature, comparing the detected battery temperature with a set threshold value, judging, and executing a battery protection action when the battery temperature is abnormal; the battery protection action at least comprises one or any combination of the following modes: outputting a prompt through a display device, carrying out sound alarm prompt, or controlling and switching a battery working mode;
the battery temperature includes sensing a battery surface temperature and/or a battery internal temperature.
Further, in the above-mentioned case,
the detection mode of the internal temperature of the battery is as follows:
detecting an alternating current signal in a battery power supply loop, outputting the alternating current signal to a differential processing circuit through a switch circuit, converting the alternating current signal into an alternating current differential signal by the differential processing circuit, and outputting the alternating current differential signal to the control module;
furthermore, the battery working mode comprises a power supply mode and a charging mode, the power supply mode comprises a high-power mode and a low-power mode, the charging mode comprises a fast charging mode and a slow charging mode, when the battery working mode is controlled to be switched, the current working mode is firstly judged, if the current power supply mode is the high-power mode, the battery working mode is controlled to be switched to the low-power mode, and if the current power supply mode is the charging mode and is the fast charging mode, the battery working mode is switched to the slow charging mode.
Further, the battery protection action further comprises: and detecting the CPU occupancy rate of the process in which the equipment works, and closing the unused process.
The invention also provides wearable equipment comprising the battery protection circuit.
Compared with the prior art, the invention has the advantages and positive effects that: the battery protection circuit can timely determine the rapid change of the internal temperature of the battery by detecting the phase of the alternating current signal in the battery power supply loop and utilizing the corresponding relation between the phase of the alternating current signal and the temperature of the battery, so that the response can be timely controlled, and the battery protection control is executed.
Other features and advantages of the present invention will become more apparent from the detailed description of the embodiments of the present invention when taken in conjunction with the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic circuit diagram of an embodiment of a battery protection circuit according to the present invention;
fig. 2 is a schematic circuit diagram of an embodiment of a wearable device according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the first embodiment, the discharging process is performed when the battery is normally powered, the battery outputs a DC voltage to the load circuit through the battery power supply loop during discharging, wherein, the load circuit is a circuit which can work only by the battery power supply in the intelligent terminal to realize one or more functions, the battery can generate alternating current to load on a battery power supply loop when discharging to cause the temperature of the battery to rise, if the battery is charged while discharging, the charging current can also cause the temperature of the battery to rise, if the terminal device running high-power applications (such as playing games, capturing images, browsing web pages, playing videos online, etc.) is charged, the temperature of the battery, the CPU and the PMU (power management unit) of the portable terminal is increased sharply due to the charging current superposed on the consumed current generated when the portable terminal runs the high-power applications, which may cause the portable terminal to be hot. At present, the battery temperature detection mode mainly detects the surface temperature of the battery directly, however, the rapid change of the internal temperature of the battery usually occurs in the range of millisecond to tens of seconds, the temperature of the battery is transmitted to the surface from the inside, and then transmitted to the temperature detection element positioned outside the battery from the surface to be sensed by the temperature detection element, the required time is long, and thus the temperature rise of the battery cannot be responded in time only by detecting the surface temperature of the battery. According to the scheme, the alternating current in the battery power supply loop is directly detected, the temperature of the battery can be obtained more quickly and accurately compared with the traditional temperature detection mode, so that the battery temperature is controlled in advance by adopting a method of early warning temperature mode selection, the safety state of the battery is predicted, the danger is avoided, the battery is protected, and the service life of the battery is prolonged. The present battery protection circuit will be described in detail with reference to a specific embodiment.
As shown in fig. 1, the battery protection circuit of this embodiment includes a switch circuit and a differential processing circuit, one end of the switch circuit is connected to the ground of the battery, the other end of the switch circuit is connected to the first differential signal end of the control module, the second differential signal end of the control module is connected to the system ground, the control module receives the ac differential signal from the ground of the battery and the system ground, calculates the phase difference of the ac differential signal, and obtains the internal temperature of the battery by looking up the relationship table between the phase difference and the internal temperature of the battery according to the phase difference, and performs the battery protection operation according to the internal temperature of the battery. The switch circuit is used for controlling the on-off state of the battery power supply circuit, when the switch circuit is switched on, the battery power supply circuit is switched on, the battery normally works, at the moment, the ground end of the battery is connected with the first differential signal end VBAT _ SEN _ P of the control module, meanwhile, the second differential signal end VBAT _ SEN _ N of the control module is connected with the system ground, alternating current signals in battery power supply current are transmitted to the differential processing circuit through the switch circuit, the alternating current signals are transmitted to the control module after being filtered by the differential processing circuit, the control module transmits the phase difference of the differential signals to the control module, and due to the fact that the phase difference of the signals and the internal temperature of the battery have a corresponding relation, the control module can obtain the internal temperature of the battery in response through the phase difference, further can monitor the internal temperature of the battery, and once the internal temperature of the battery exceeds a set threshold value, corresponding protection control can be executed. The scheme has the advantages of accurate detection of the temperature of the battery and high response speed.
As a preferred embodiment, the switch circuit includes a discharge protection switch Q1 and a first capacitor C1 connected in parallel with the discharge protection switch Q1, and a control terminal Charge of the discharge protection switch Q1 is connected to the control module. The control module controls the on state of the discharge protection switch by sending a control signal to the discharge protection switch Q1.
The discharge protection switch can be realized by adopting an NMOS tube, the grid electrode of the NMOS tube is connected with the control module, the source electrode of the NMOS tube is connected with the differential processing circuit, and the drain electrode of the NMOS tube is connected with the ground end of the battery.
When the battery works normally, the control module sends a high level to the control terminal Charge, the discharge protection switch Q1 is turned on, and the ground terminal of the battery and the first differential signal terminal VBAT _ SEN _ P are turned on. When the battery enters a protection and standby mode, the control module sends a low-level control signal to the discharge protection switch Q1, the discharge protection switch Q1 is not turned on, and by arranging the first capacitor C1, the signal is isolated from direct current by the first capacitor C1 to transfer alternating current at the moment, and VBAT _ SEN _ P and VBAT _ SEN _ N can still perform phase difference calculation on the alternating current and the frequency signals at two ends of the battery after passing through the internal amplifier. The control module can continuously monitor the internal temperature of the battery without being limited by the working mode of the battery.
The discharging protection switch Q1 is further connected to a charging protection switch Q2, and in general, the charging protection switch is controlled by a control signal DISCharge sent by the control module and is in a conducting state, when the charging protection switch Q1 is in an overcharged state, the control module controls the charging protection switch Q2 to be turned off, and the charging protection switch Q2 may be implemented by using one NMOS transistor.
The system stores a phase and battery internal temperature relation table which can be summarized through multiple temperature control box tests, and the control module judges whether the battery early warning temperature is reached or not by inquiring the phase and battery internal temperature relation table according to the phase difference. If the software part in the control module monitors that the temperature value is higher than the early warning value, the software part also selects which cooling mode to start according to the size of the current temperature value and the running condition of the CPU process.
The differential processing circuit comprises a common-mode inductor L1, a first input end of the common-mode inductor L1 is connected with the switch circuit, a second input end of the common-mode inductor L1 is connected with the system ground, a first output end of the common-mode inductor L1 is connected with a first differential signal end VBAT _ SEN _ P of the control module, a second output end of the common-mode inductor L1 is connected with a second differential signal end VBAT _ SEN _ N of the control module, and a first resistor R1 is connected between the first input end and the second input end of the common-mode inductor. The two pins VBAT _ SEN _ P and VBAT _ SEN _ N are the differential battery current sensor positive and negative terminal interfaces, where P-terminated battery ground and N-terminated system ground. And voltage errors caused by overshoot and undershoot on a single pin of the differential line are reduced through the common-mode inductor in the middle, and voltage signals are stabilized. And the other two lines are respectively used for signal regulation by a capacitor and an inductor with the same value, and the capacitor is selected as a NF-level capacitor with a small capacitance value to filter high frequency because the amplitude of a signal connected with the differential line is small.
The first resistor R1 is used to calculate the current magnitude, I = (UP-UN)/R1. Here, the resistance value of R1 is designed to be small, and the specific value is adjusted according to the difference of each design use field. The part is a battery temperature detection auxiliary part and is mainly used for stabilizing voltage signals and calculating current amplitude for the reference of a battery protection module.
The first output end and the second output end of the common mode inductor are respectively connected with the system ground through a capacitor C2 and a capacitor C3, and the common mode inductor is used for filtering interference signals in the circuit.
A thermistor R2 is also arranged at a position close to the battery, one end of the thermistor R2 is connected with the control module, and the other end of the thermistor R2 is connected with the system ground through a capacitor. The thermistor R2 is used for detecting the external temperature of the battery, and the control module can improve the potential safety hazard brought by the external temperature change of the battery by adjusting the control current. The control module supplies a constant current to the NTC _ VBATT pin, the thermistor R2 can generate a corresponding voltage, the specification of the thermistor R2 needs to be changed according to the change of the using environment of the circuit, and if the temperature range needing to be detected is wide, the appropriate thermistor needs to be selected according to the specification. Along with the change of the current of the battery, the temperature value of the thermistor R2 changes, the resistance value changes, and then the corresponding voltage value also changes, and according to UR2= I constant R2, when the control module detects the voltage change of the NTC _ VBATT pin, the voltage change is converted into the corresponding temperature value according to the temperature resistance value table corresponding to the thermistor. If the temperature value is monitored to be higher than the early warning value in the control module, a corresponding cooling mode is selected according to the current temperature value and the running condition of the CPU process. The control module may perform alarm prompting in various ways, such as outputting a prompt through a display device, performing an audible alarm prompt, or controlling to switch the battery operating mode.
The scheme has the advantages that the temperature of the battery is obtained by feeding back the temperature value through the thermistor and detecting the phase difference between the alternating current and the frequency signals at two ends of the battery, and compared with the traditional external thermometer, the temperature of the battery can be obtained more quickly and accurately, so that the battery temperature is controlled in advance by adopting a method of early warning temperature mode selection, the safety state of the battery is predicted, the danger is avoided, the battery is protected, and the service life of the battery is prolonged.
In a second embodiment, the present invention provides a battery protection method, where the battery protection method includes the battery protection circuit described in the first embodiment, where a battery provides a direct current for a load circuit through a battery power supply loop, and the battery protection method includes the following steps:
detecting the battery temperature, comparing the detected battery temperature with a set threshold value, judging, and executing a battery protection action when the battery temperature is abnormal; the battery protection action at least comprises one or any combination of the following modes: outputting a prompt through a display device, carrying out sound alarm prompt, or controlling and switching a battery working mode;
the detected battery temperature includes detecting a battery surface temperature and/or detecting a battery internal temperature.
The detection mode of the internal temperature of the battery is as follows:
the method comprises the steps that an alternating current signal in a battery power supply circuit is detected, the alternating current signal is output to a differential processing circuit through a switch circuit, and the differential processing circuit converts the alternating current signal into an alternating current differential signal and outputs the alternating current differential signal to a control module;
the control module calculates the phase difference of the received alternating current differential signals;
inquiring a relation table between the phase difference and the internal temperature of the battery to obtain the internal temperature of the battery; the relation table of the phase difference and the internal temperature of the battery is prestored in the storage module.
The battery working mode comprises a power supply mode and a charging mode, the power supply mode comprises a high-power mode and a low-power mode, the charging mode comprises a quick charging mode and a slow charging mode, when the battery working mode is controlled to be switched, the current working mode is judged firstly, if the current power supply mode is the high-power mode, the battery working mode is controlled to be switched to the low-power mode, and if the current power supply mode is the charging mode and the quick charging mode, the battery working mode is switched to the slow charging mode. The control switching charging mode is only suitable for products being charged, and overhigh temperature caused by charging current is reduced. The specific values of high and low in the high power mode and the low power mode are not limited in the scheme, and the intelligent devices with different models and different capacities are different, but it is clear that manufacturers can define at least two power supply modes when designing the charging mode, namely the high power mode and the low power mode, and the values of high and low are relatively defined, so that the high and low power modes can be intuitively understood from a literal sense, and the output power consumption of the battery in the high power mode is larger than that of the battery in the low power mode. Similarly, "fast" and "slow" in the fast charging mode and the slow charging mode are also relative terms, and generally charging is performed by defining different charging currents.
The battery protection action further comprises: and detecting the CPU occupancy rate of the process in which the equipment works, and closing the unused process so as to further reduce the power consumption and reduce the temperature.
In a third embodiment, the protection circuit of the first embodiment can be applied to any product requiring a battery. Especially, be applicable to wearing class product, like bracelet wrist-watch, sports type earphone etc. to the product battery homoenergetic that charges, work, or charge while the during operation in the time of charging play the effect of temperature monitoring and regulation. When being applied to wearing class product, control module can adjust by oneself according to the temperature that detects, reaches the most comfortable sensation temperature of human body, has also further guaranteed the security of product.
The embodiment provides a wearable device, which is described by taking a sports watch as an example, and as shown in fig. 2, the wearable device is a schematic block diagram of the sports watch, and includes: battery protection circuit, battery pass through battery protection circuit for the other functional circuit power supplies of equipment, because the required operating voltage value of each functional circuit is different, before for each functional circuit power supply, still need carry out voltage conversion through voltage conversion module, wherein, functional circuit can be: the battery protection circuit is as described in the first embodiment, the temperature detection control circuit is located in the battery charging control protection module of the whole product, the battery protection module formed by the battery protection chip mainly detects the action of the voltage of the battery, when the battery is overcharged, the charge is set high, the Q1 is conducted, when the battery is overdischarged, the discharge is set high, and the Q2 is conducted. In general, the battery is in a state of Q1 conduction, that is, the negative pole of the battery and the module ground can be connected, and the battery temperature detection control module can work normally to detect the external temperature of the battery. In the case of over-discharge, if the battery has a sudden state, even if the Q1 is not conducted, the detected alternating current signal can be transmitted through the C3, the phase difference between the alternating current and the frequency signals at two ends of the battery can be detected, and the temperature of the battery can be obtained by inquiring a relation table between the phase and the internal temperature of the battery.
The voltage conversion module, the battery protection circuit and the like are used for generating voltage values required by various modules of the wearable product and controlling the current.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (8)
1. A battery protection circuit is characterized by comprising a switch circuit, wherein one end of the switch circuit is connected with the ground end of a battery, the other end of the differential signal is connected with a first differential signal end of the control module, a second differential signal end of the control module is connected with a system ground end, the control module receives alternating current differential signals from the battery ground and the system ground, calculates the phase difference of the alternating current differential signals, and the internal temperature of the battery is obtained according to the phase difference query phase difference and internal temperature relation table of the battery, and executes battery protection action according to the internal temperature condition of the battery, and also comprises a differential processing circuit, wherein one path of the differential processing circuit is connected between the switch circuit and a first differential signal end of the control module, the other path of the differential processing circuit is connected between a system ground end and a second differential signal end of the control module;
the differential processing circuit comprises a common-mode inductor, a first input end of the common-mode inductor is connected with the switch circuit, a second input end of the common-mode inductor is connected with the system ground, a first output end of the common-mode inductor is connected with a first differential signal end of the control module, a second output end of the common-mode inductor is connected with a second differential signal end of the control module, a first resistor is connected between the first input end and the second input end of the common-mode inductor, and the first output end and the second output end of the common-mode inductor are respectively connected with the system ground through a capacitor.
2. The battery protection circuit of claim 1, wherein the switching circuit comprises a discharge protection switch and a first capacitor connected in parallel with the discharge protection switch, and a control terminal of the discharge protection switch is connected to the control module.
3. The battery protection circuit of claim 2, wherein the discharge protection switch is an NMOS transistor, a gate of the NMOS transistor is connected to the control module, a source of the NMOS transistor is connected to the differential processing circuit, and a drain of the NMOS transistor is connected to the ground of the battery.
4. A battery protection method, characterized in that the battery protection method is based on the battery protection circuit of any one of claims 1-3, the battery provides direct current for the load circuit through the battery power supply loop,
the battery protection method comprises the following steps:
detecting the battery temperature, comparing the detected battery temperature with a set threshold value, judging, and executing a battery protection action when the battery temperature is abnormal; the battery protection action at least comprises one or any combination of the following modes: outputting a prompt through a display device, carrying out sound alarm prompt, or controlling and switching a battery working mode; wherein the battery temperature comprises detecting a battery surface temperature and/or a battery internal temperature.
5. The battery protection method according to claim 4, wherein the internal temperature of the battery is detected by:
detecting an alternating current signal in a battery power supply loop, outputting the alternating current signal to a differential processing circuit through a switch circuit, converting the alternating current signal into an alternating current differential signal by the differential processing circuit, and outputting the alternating current differential signal to the control module;
the control module calculates the phase difference of the received alternating current differential signals;
inquiring a relation table between the phase difference and the internal temperature of the battery to obtain the internal temperature of the battery; the relation table of the phase difference and the internal temperature of the battery is prestored in the storage module.
6. The battery protection method according to claim 4, wherein the battery operating modes include a power supply mode and a charging mode, the power supply mode includes a high power mode and a low power mode, the charging mode includes a fast charging mode and a slow charging mode, when the battery operating modes are controlled to be switched, the current operating mode is determined first, if the current power supply mode is the high power mode, the battery operating modes are controlled to be switched to the low power mode, and if the current power supply mode is the charging mode and the fast charging mode, the battery operating modes are switched to the slow charging mode.
7. The battery protection method of any of claims 4-6, wherein the battery protection action further comprises: and detecting the CPU occupancy rate of the process in which the equipment works, and closing the unused process.
8. A wearable device comprising the battery protection circuit of any of claims 1-3.
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| EP2700061A4 (en) * | 2011-04-22 | 2014-11-19 | Expanergy Llc | Systems and methods for analyzing energy usage |
| CN103248075A (en) * | 2012-02-07 | 2013-08-14 | 鸿富锦精密工业（深圳）有限公司 | Battery management system and method |
| CN102680904A (en) * | 2012-05-15 | 2012-09-19 | 上海福睿电子科技有限公司 | Battery internal temperature detection circuit and detection method |
| CN103633700B (en) * | 2013-12-03 | 2016-03-23 | 国家电网公司 | A kind of direct current system of multiple-connected battery internal resistance on-line checkingi |
| FR3043855B1 (en) * | 2015-11-16 | 2019-04-19 | Bluebus | METHOD AND SYSTEM FOR ELECTRICALLY RECHARGING AN ELECTRIC VEHICLE |
| DE102017212309B3 (en) * | 2017-07-19 | 2018-09-06 | Bayerische Motoren Werke Aktiengesellschaft | Coolant circuit with at least two cooling circuits and a latent heat storage |
| CN207801529U (en) * | 2018-01-17 | 2018-08-31 | 深圳市壹捌壹玖科技有限公司 | A kind of battery protection management system |
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Effective date of registration: 20230404 Address after: 18/F, Building 2, Shandong Private Science and Technology Building (Minghui International), No. 39 Shiling Road, Laoshan District, Qingdao City, Shandong Province, 266035 (centralized office area) Patentee after: Qingdao Suiyun Electronic Technology Co.,Ltd. Address before: 266104 Room 308, North Investment Street Service Center, Laoshan District, Qingdao, Shandong. Patentee before: GOERTEK TECHNOLOGY Co.,Ltd. |
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