CN111009937A - Mobile IoT terminal suitable for low temperature environment - Google Patents
Mobile IoT terminal suitable for low temperature environment Download PDFInfo
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- CN111009937A CN111009937A CN201911158238.6A CN201911158238A CN111009937A CN 111009937 A CN111009937 A CN 111009937A CN 201911158238 A CN201911158238 A CN 201911158238A CN 111009937 A CN111009937 A CN 111009937A
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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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
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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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
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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
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Abstract
本申请公开了一种适用低温环境的移动物联网终端，包括：移动通信平台、电量检测模块、多个串联的单节电池、多个电压检测模块、温度检测模块和补温模块；移动通信平台用于根据来自电压检测模块的相应单节电池的电压，来自电量检测模块的多个单节电池的充放电参数和来自温度检测模块的单节电池的温度，调整多个单节电池的充电功率或多个单节电池的放电功率；在确定多个单节电池的温度低于预设阈值时，控制补温模块为多个单节电池补温，根据电池充放电关系对应的温度，向补温模块发送停止补温命令。本申请解决了低温环境下，终端电池工作容量与电池自身有效容量不匹配、无法充电的问题，实现移动物联网终端在低温环境下的使用性能和产品竞争力。
The present application discloses a mobile Internet of Things terminal suitable for a low temperature environment, comprising: a mobile communication platform, a power detection module, a plurality of single-cell batteries connected in series, a plurality of voltage detection modules, a temperature detection module and a temperature compensation module; a mobile communication platform It is used to adjust the charging power of multiple single-cell batteries according to the voltage of the corresponding single-cell battery from the voltage detection module, the charge and discharge parameters of the multiple single-cell batteries from the power detection module, and the temperature of the single-cell battery from the temperature detection module or the discharge power of multiple single-cell batteries; when it is determined that the temperature of multiple single-cell batteries is lower than the preset threshold, the temperature compensation module is controlled to supplement the temperature for multiple single-cell batteries, and according to the temperature corresponding to the battery charge-discharge relationship, to the compensation The temperature module sends a stop compensation command. The present application solves the problem that the working capacity of the terminal battery does not match the effective capacity of the battery itself and cannot be charged under the low temperature environment, and realizes the use performance and product competitiveness of the mobile Internet of Things terminal under the low temperature environment.
Description
Technical Field
The application relates to the field of mobile internet of things terminals, in particular to a mobile internet of things terminal suitable for a low-temperature environment.
Background
With the development of the internet of things, the application of the internet of things is more and more extensive, the demand on the intelligent terminal of the internet of things is more and more, and with the demand and the development of informatization of various industries, the internet of things starts to be widely applied in various industries. The mobile animal networking terminal is based on an intelligent mobile communication platform and various internet of things technologies (a bar code technology, a radio frequency identification technology, a GPS positioning technology, a video technology, a temperature measurement technology, an infrared technology, an optical power measurement technology, a red light source, a line tracing technology, a digital multimeter, a line inspection machine, an optical network unit test and speed measurement, a high-speed measurement, a kilomega speed measurement, an identity card test, a micro printer and the like), the multiple services organically combine the intelligent terminal technology, including a wired technology, a wireless technology, an internet of things technology, mobile communication, mobile office and the like.
The scheme of the current intelligent mobile communication platform adopts a single lithium battery scheme, and for terminals with USB peripheral equipment, ultrahigh frequency RFID, XDSL and the like which need 5V and the like and are powered by high power, which is larger than the voltage of the single battery, the terminals need to be powered by boosting, the battery needs to have larger discharging output capacity, and the lithium battery can achieve better service performance at normal temperature. However, when the temperature is below 0 ℃, the discharge capacity of the lithium battery is reduced. When the temperature is-20 ℃, the discharge capacity can only reach about 40-60% of the rated capacity. Meanwhile, when the temperature is below 0 ℃, the impedance and polarization internal resistance of the electrolyte become large, and when high-rate discharge is caused, the output voltage becomes low, so that the stable state of the intelligent mobile communication platform cannot be met, and even the Internet of things terminal can start a low-voltage protection mechanism to automatically shut down the intelligent mobile communication platform.
Meanwhile, when the temperature is below 0 ℃, the low temperature causes the abnormal migration of the electrolyte ions of the lithium battery, and the charging causes the irreversible damage to the battery capacity and the discharge cycle life. Especially when the temperature is below-5 ℃, the lithium battery cannot be charged, and if the battery is forcibly charged, the battery is directly damaged, such as a bulge of the battery, which may cause a safety problem. In principle, lithium batteries are prohibited from charging below 0 ℃ and are strictly prohibited from charging below-5 ℃. The charging is carried out at 0 ℃ to-5 ℃ under emergency conditions only by small current, and the charging is carried out in a small capacity range on the premise of damaging the battery. In addition, fig. 1 to 5 show that the effective capacity of the battery itself is not used effectively, which also results in large deviation of the electric quantity measurement. The above problems also occur in general communication terminals such as mobile phones at low temperatures.
Disclosure of Invention
In order to solve the problems, the mobile internet of things terminal suitable for the low-temperature environment and the power supply method thereof are provided, so that the problems that the working capacity of a terminal battery is not matched with the effective capacity of the terminal battery and the terminal battery cannot be charged under the low-temperature environment are solved, and the use performance and the product competitiveness of the mobile internet of things terminal under the low-temperature environment are realized.
The embodiment of the application provides a be suitable for low temperature environment's removal thing networking terminal, includes: the device comprises a mobile communication platform, an electric quantity detection module, a plurality of single batteries, a plurality of voltage detection modules, a temperature detection module and a temperature compensation module;
the single batteries are connected in series;
the voltage detection modules are respectively connected with the single batteries and used for detecting the current voltage of the corresponding single battery;
the electric quantity detection module is connected with the plurality of single batteries in series and used for acquiring the charge and discharge parameters of the plurality of single batteries after the single batteries are connected in series, and the charge and discharge parameters comprise: charge-discharge voltage, charge-discharge capacity, charge-discharge energy, charge-discharge current and charge-discharge time; the temperature detection module is connected with the plurality of single batteries and is used for acquiring the temperatures of the plurality of single batteries in real time;
the mobile communication platform is used for determining whether the temperature of the plurality of single batteries is lower than a preset threshold value and indicating the temperature supplementing module to supplement the temperature for the plurality of single batteries; and adjusting the charging power of the plurality of single batteries or the discharging power of the plurality of single batteries according to the charging and discharging parameters and the temperature of the single batteries.
In one example, the mobile communication platform is configured to determine a residual capacity and a residual energy of each single battery according to a voltage of the corresponding single battery from the voltage detection module and the charge and discharge parameters of the plurality of single batteries from the power detection module, and determine a charge and discharge loss deviation value of each single battery according to a charge and discharge relationship between the residual capacity and the residual energy of each single battery and a pre-stored battery; and determining to trigger the balance power supply module to supply power to the corresponding single battery according to the relation between each charging and discharging loss deviation value and a preset deviation threshold value.
In one example, the terminal further includes: a charge and discharge management module;
one end of the charge and discharge management module is respectively connected with the electric quantity detection module, the voltage detection modules and the temperature detection module and is used for receiving the charge and discharge parameters, the current voltage of the single battery and the temperatures of the single batteries;
one end of the charge and discharge management module is connected with the mobile communication platform and used for sending the charge and discharge parameters, the current voltage of the single batteries and the temperature of the single batteries to the mobile communication platform and receiving and executing a circuit control instruction sent by the mobile communication platform, wherein the circuit control instruction is used for indicating the charge and discharge management module to adjust one or more of charging power, electric power compensation power, battery temperature and electric power compensation quantity.
In one example, the charge and discharge management module includes: a voltage regulation circuit and a current regulation circuit;
the voltage regulation circuit includes: the voltage regulation and control chip comprises a voltage regulation and control chip, a capacitor, an inductor, a resistor, a diode and a first digital potentiometer;
the current regulation circuit includes: the current regulation and control chip and the second digital potentiometer;
the first pin of the voltage regulation chip is respectively connected with the anode of the diode and one end of the inductor; the second pin of the voltage regulation chip is connected with the first digital potentiometer and grounded; the third pin of the voltage regulation chip is respectively connected with one end of the resistor and the first digital potentiometer; a fourth pin of the voltage regulation chip receives a chip selection signal; a fifth pin of the voltage regulation chip is respectively connected with a power supply and one end of the capacitor; a sixth pin of the voltage regulation chip is connected with the other end of the capacitor and the other end of the inductor;
the first pin of the current regulation chip is respectively connected with the other end of the resistor and the cathode of the diode; and the second digital potentiometer is respectively connected with the second pin of the current regulation chip and the third pin of the current regulation chip.
In one example, the battery charge-discharge relationship is a change in battery voltage or remaining capacity caused by a change in battery charge or discharge with time at a preset current, a preset temperature;
the mobile communication platform is used for determining the current charging and discharging time and the corresponding preset charging and discharging termination time in the battery charging and discharging relation according to the current detected by the electric quantity detection module and the temperature acquired by the temperature detection module;
and determining corresponding residual charge-discharge time according to the current charge-discharge time and the charge-discharge termination time.
In one example, the mobile communication platform is configured to determine power for charging the plurality of single batteries and power for warming the plurality of single batteries according to the temperature detected by the temperature detection module and the charging current, respectively.
In one example, the mobile communication platform is configured to determine a charging current according to the temperature obtained by the temperature detection module;
the mobile communication platform charges the plurality of single batteries according to the charging current
In one example, the voltage detection module includes: the circuit comprises an operational amplifier, a first resistor, a second resistor and a third resistor;
the non-inverting input end of the operational amplifier is connected with the anode of the single battery through the first resistor, the inverting input end of the operational amplifier is connected with the cathode of the single battery through the second resistor, and the inverting input end of the operational amplifier is connected with the output end of the operational amplifier through the third resistor.
In one example, the temperature compensation module includes: the device comprises a metal oxide semiconductor field effect MOS tube, a heating unit, a third resistor and a fourth resistor;
the source electrode of the MOS tube is connected with the fourth resistor through the third resistor, the other end of the fourth resistor is connected with the grid electrode of the MOS tube, the drain electrode of the MOS tube is connected with the heating unit, and the other end of the heating unit is connected with the ground.
The embodiment of the application provides a be suitable for low temperature environment's removal thing networking terminal, change single lithium cell scheme into and can effectively alleviate the influence that single battery voltage sharply descends and bring for power supply system and terminal when the discharge current is too big through a plurality of single batteries series connection together, temperature detection module detects the temperature of a plurality of single batteries, mobile communication platform is when confirming that the battery temperature is less than preset threshold value, instruct to mend the temperature module and mend the temperature for a plurality of single batteries and terminal, thereby terminal battery working capacity and battery self effective capacity mismatch under the solution low temperature, performance decline problem. In addition, the mobile communication platform determines the charging power of a plurality of single batteries or the discharging power of a plurality of single batteries according to the charging and discharging parameters, the temperature of the single batteries and the current voltage so as to detect whether the current temperature has influence on the charging and discharging of the batteries, thereby realizing the real-time temperature compensation of the batteries. To sum up, the technical scheme that this application embodiment provided can solve under the low temperature environment, and the unmatched problem of terminal battery working capacity and battery self effective capacity to realize performance and product competitiveness of mobile internet of things terminal under the low temperature environment.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:
fig. 1(a) and fig. 1(B) are discharge data with a continuous current of 2A at normal temperature provided in the embodiments of the present application;
fig. 2(a) and fig. 2(B) are discharge data with a continuous current of 3A at normal temperature provided in the embodiments of the present application;
FIGS. 3(A) and 3(B) are discharge data with a continuous current of 2A at-20 ℃ provided in the examples of the present application;
FIGS. 4(A) and 4(B) are discharge data with a continuous current of 3A at-20 ℃ provided in the examples of the present application;
fig. 5 is a schematic diagram of a battery discharge relationship provided in an embodiment of the present application;
fig. 6 is a schematic structural diagram of a mobile internet of things terminal suitable for a low temperature environment according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of another mobile internet of things terminal suitable for a low-temperature environment according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of another mobile internet of things terminal suitable for a low temperature environment according to an embodiment of the present application;
fig. 9 is a circuit diagram of a voltage and temperature detecting, sampling, balancing, power supplementing and temperature supplementing executing portion of a mobile internet of things according to an embodiment of the present application;
fig. 10 is a circuit diagram of a charging and discharging management module according to an embodiment of the present application.
Detailed Description
In order to more clearly explain the overall concept of the present application, the following detailed description is given by way of example in conjunction with the accompanying drawings.
At present, the scheme of the intelligent mobile communication platform adopts a single lithium battery scheme, and the types of the lithium battery mainly comprise lithium cobaltate, lithium manganate, lithium nickelate, ternary materials, lithium iron phosphate and the like. Lithium cobaltate is a positive electrode material used by most lithium ion batteries at present, and the discharge termination voltage of the lithium cobaltate is generally 3V (according to the regulation of the related standard GB/T18287-2013, the "charge limit voltage" and the "discharge termination voltage" are regulated by manufacturers, and according to the discharge platform of the chemical material of the battery core, different materials have different discharge platforms, such as the nominal voltage of the lithium cobaltate is 3.8V (3.7V), the charge limit voltage is 4.35V (4.2V), the nominal voltage of other lithium iron phosphate batteries is 3.2V, the termination charge voltage is 3.6V, and the termination discharge voltage is 2.0V). Therefore, the lithium battery is only capable of effectively using the working capacity of the battery when the lithium battery discharges to the capacity (voltage for stable working of the intelligent mobile communication platform scheme) released by 3.5V.
With the development of technology, the terminal of the internet of things is applied to various scenes, which causes the terminal of the internet of things to operate in low-temperature environments, such as outdoor scenes (winter and frigid regions in northeast, northwest and other regions) of electric power, railway, field surveying and mapping, and the use environment of the terminal can reach-20 ℃ generally, as mentioned above, under the scene, the battery performance faces a serious challenge.
As shown in FIGS. 1(A) to 4(B), FIGS. 1(A) to 4(B) show data of the discharge of a 9800mAh lithium battery at normal temperature and high continuous currents of 2A and 3A at-20 ℃. For convenience of illustration, data at the beginning stage of the test and data at the end stage of the test are respectively intercepted and combined with the curves in fig. 5 to illustrate the difference of the battery performance at different temperatures and different currents. It can be known from the discharge data that when a large current is discharged at a low temperature (-20 ℃) (3A, which is equivalent to a functional module with a large power at the start of the terminal of the internet of things), the voltage of the battery is instantaneously lower than 3.5V, which causes the voltage of the terminal to be shut down, but the effective capacity of the battery is concentrated between 3.4V and 3V, and the battery is not effectively used. Fig. 1 to 5 can show that the working capacity of the battery effectively used by the mobile internet of things terminal is reduced along with the temperature reduction and the great reduction of the battery discharge flow, and the working capacity is rapidly reduced particularly in a low-temperature environment, so that the effective capacity of the battery can not be used, and finally, the internet of things intelligent terminal can not be effectively started for use. In addition, even at normal temperature, if the battery continuously operates with large current, partial battery capacity can not be discharged, so that the power metering deviation is large, and the use effect is influenced.
In summary, the prior art has the following disadvantages:
1. at low temperature, the battery capacity can not be effectively discharged, so that the working capacity of the effectively used battery is not matched with the effective capacity of the battery. Therefore, the intelligent terminal of the Internet of things cannot work normally, and the battery cannot be charged at low temperature.
2. The continuous large current discharge causes the deviation of the electric quantity to be increased, the working time of the battery to be short and the service performance of the battery to be reduced.
3. For high-power supply larger than the voltage of a single battery, a boosting power supply mode is adopted, the discharge current output of the battery is increased, and therefore mismatching factors are increased.
The problems lead to the fact that the internet of things terminal cannot work normally at low temperature and work continuously with large current, the electric quantity meter has large deviation and cannot be charged, and the normal function and efficiency of the terminal cannot be fully exerted. In order to solve the above problem, an embodiment of the present application discloses a mobile internet of things terminal suitable for a low temperature environment, as shown in fig. 6, including: the mobile communication system comprises a mobile communication platform 101, an electric quantity detection module 102, a battery 103, a voltage detection module 104, a balance compensation module 105, a temperature detection module 106 and a temperature compensation module 107. The battery 103 is a single battery, and the batteries are connected in series. The mobile communication platform 101 has a power management function, and effectively distributes the output power of the power to different components of the platform system, manages charging and discharging, and measures the power consumption of each component of the terminal. The mobile communication platform 101 is provided with a built-in programmable component or control interface, a communication component or communication interface for facilitating data exchange and communication, and the built-in programmable component or control interface, the communication component or communication interface can be expanded according to actual needs. Various communication forms such as wired communication, wireless communication, serial connection and internet access connection can be realized by adding each component interface, and then remote control is realized. In order to facilitate the operation of the mobile communication platform 101 by the staff, an input device interface and an output device interface are added to the mobile communication platform 101, and the input device interface is connected with an input device, such as a keyboard; the output device interface is connected to an output device, for example, an LCD (Liquid Crystal Display) touch panel integrating input and output functions.
Each of the single batteries corresponds to one voltage detection module 104 and one balance compensation module 105. Fig. 6 is a diagram illustrating the connection relationship between the modules, and is not to be regarded as an actual circuit diagram. In the actual circuit, the positive pole of the battery 1 is the terminal total power supply output, and the negative pole of the battery n is grounded. The electric quantity monitoring module is connected with the positive electrode of the battery 1 and is connected in series with a main power supply loop of the battery, and the total charging and discharging current and electric quantity of the terminal are monitored in real time. The battery voltage detection module 104 and the balance compensation module 105 are connected in parallel to the positive and negative electrodes of the corresponding single battery, and the battery temperature detection module 106 is connected with the battery temperature detection end to monitor the battery temperature in real time. The temperature compensation module 107 compensates the temperature of each single battery through the temperature compensation execution end. The electric quantity detection module 102, the voltage detection module 104 and the balance compensation module 105 are all connected with the intelligent mobile communication platform and receive a control instruction issued by the platform.
Each part and the module can be an integrated assembly or independent parts, and if the parts and the module are packaged into the integrated assembly, the structure of the whole terminal is simplified, so that the occupied space of the whole terminal is reduced, and the cost is greatly reduced. If each component and unit of the terminal are respectively composed of independent modules, the flexibility of the system is enhanced. A plurality of single batteries are connected in series, the total voltage of the batteries is greater than the voltage required by the load during operation, the voltage reduction mode is adopted for regulation, and compared with the mode that the single batteries need to be regulated in a voltage boosting mode, the output current of the batteries is reduced under the condition that the output power is the same, so that the power loss caused by factors such as the internal resistance of the batteries is reduced, and the energy supply efficiency is improved.
Specifically, for example, as shown in fig. 7, in order to better adjust the electric quantity of each battery, a main charging and discharging management module is provided on the basis of fig. 6, and the module replaces the mobile communication platform 101 in fig. 6 to manage each module, and the mobile communication platform 101 only needs to manage the main charging and discharging management module. Since the main function of the mobile communication platform 101 is communication, the main charging and discharging management module is used to replace the mobile communication platform 101 to manage each module, thereby reducing the load of the mobile communication platform 101 and improving the working efficiency of the mobile communication platform 101 in terms of communication. Therefore, in fig. 7, the mobile communication platform 101 is connected to the internet of things module, the external device and the communication component. In addition, in fig. 7, each part of the main charge and discharge management module and each module may be an independent part, or may be integrated into one module, that is, a dynamic power management and protection module.
The dynamic power management and protection module in fig. 7 is configured to collect the working current, the battery voltage, the temperature, and the working state of the fuel gauge of the terminal, transmit the parameters and the state to the mobile communication platform 101, and receive a control instruction issued by the mobile communication platform 101 according to the working parameters to implement dynamic management and protection of the power management, the temperature, the battery, and the electric quantity of the terminal.
Specifically, the series-powered battery includes: the battery I and the battery II are connected in series, the negative electrode of the battery I is connected with the positive electrode of the battery II in series, the positive electrode of the battery I is used for providing power for the terminal to output, and the negative electrode of the battery II is grounded. The main charging and discharging management module is connected with the battery voltage detection module I, the battery voltage detection module II, the battery temperature detection module, the balance compensation module I and the balance compensation module II. The electric quantity monitoring module is connected with the positive electrode of the battery I and is connected in series with a main power supply loop of the battery, and the total charging and discharging current and electric quantity of the terminal are monitored in real time. And the battery voltage detection module I is connected with the anode and the cathode of the battery I in parallel and monitors the voltage of the battery I in real time. And the battery voltage monitoring module II is connected with the anode and the cathode of the battery II in parallel and monitors the voltage of the battery II in real time. The battery temperature detection module is connected with the battery temperature detection end to monitor the battery temperature in real time. And the balance compensation module I is connected with the positive electrode and the negative electrode of the battery I in parallel. And the balance compensation module II is connected with the positive electrode and the negative electrode of the battery II in parallel. The main charging and discharging management module is connected with the intelligent mobile communication platform, manages the power supply of the terminal, communicates with the intelligent mobile communication platform in real time, transmits the working current, the battery voltage, the temperature, the electric quantity and the management state of the terminal to the mobile communication platform and receives a control instruction issued by the mobile communication platform. This example can use a general fast charge protocol charger directly, with its charge control above 6V, without special customization.
As shown in fig. 8, the types of the battery I and the battery II are different, and under the same condition, the discharge time of the battery I is longer than that of the battery II, at this time, the battery I and the battery II may share the balance compensation module, the output end of the balance compensation module is respectively connected to the connection series node between the negative electrode of the battery I and the positive electrode of the battery II and the ground, and the connection relationship between other modules and each component is the same as that in fig. 7. For the above situation, during the discharging process, the battery II will consume power first, and at this time, the battery I still has residual power, and the battery I and the battery II cannot continue to supply power to the whole circuit, and the battery cannot give full play to the power supply efficiency. The balance power supply module supplies power to the battery II, so that the battery I and the battery II can discharge at the same time, and the power supply efficiency is improved. During the charging process, the difference between the scheme in fig. 8 and the scheme in fig. 7 is that when the battery I is supplied with power, the voltage of the output point of the balancing power supply module connected with the series node is the same as the voltage of the battery ii, and the main charging and discharging management module continues to turn on the charging circuit. When the battery II needs to be supplied with power, the main charging and discharging management module closes the charging circuit, and the balance power supply module supplies power to the battery II through the series node. Here, the series node is a point marked between battery I and battery II in fig. 8.
In the embodiment of the application, the functions of each module of the mobile internet of things terminal are expanded and explained by taking a discharging process and a charging process as examples respectively.
And for the discharging process, the electric quantity monitoring module acquires the total discharging voltage, the total discharging capacity, the total discharging energy and the total discharging current of the single batteries after the single batteries are connected in series in real time. The battery voltage detection module 104 monitors the voltage of the corresponding series single battery in real time, and the battery temperature detection module 106 monitors the battery temperature in real time. The mobile communication platform 101 is configured to determine a residual capacity and a residual energy of each single battery according to a voltage of the corresponding single battery from the voltage detection module 104 and a discharge voltage, a discharge capacity, a discharge energy, and a discharge current of the plurality of single batteries from the power detection module 102, and determine a discharge loss deviation value of each single battery according to a charge-discharge relationship between the residual capacity and the residual energy of each single battery and a pre-stored battery. The discharge loss deviation value is a difference between the maximum remaining capacity and any other remaining capacity among the remaining capacities. The battery charging and discharging relationship comprises: the change of the battery voltage or the remaining capacity caused by the change of the battery charging or discharging with time under the preset current and the preset temperature. In addition, the battery charge-discharge relationship can also be a plurality of charge-discharge curves corresponding to the actual discharge electric quantity, the battery capacity and the battery energy.
In the embodiment of the application, firstly, a plurality of battery operating temperature points and a plurality of temperature point undershoot discharge current data are obtained, and simultaneously, the battery capacity in each working scene and the working capacity of the battery which can be effectively used by the mobile internet of things terminal are obtained. And fitting a charging and discharging curve corresponding to various discharging currents at each temperature point according to the obtained data to obtain a battery charging and discharging relation. And the obtained battery charging and discharging relation is stored in the mobile communication platform 101 to be used as the basis for terminal power supply, temperature rise, power supply dynamic management, protection and battery health evaluation.
In the embodiment of the application, the battery charge-discharge relationship is a battery performance algorithm model fitted based on discharge curves of various charge-discharge currents corresponding to various temperature points, however, the actual charge-discharge relationship of the terminal battery is different from the charge-discharge curve of the theoretical model. The difference can cause the deviation of electric quantity measurement, temperature compensation and power compensation. In order to accurately measure the electric quantity, supplement the temperature and supplement the electricity, parameters such as the electric charge and discharge capacity, the energy, the current, the charge and discharge cycle times and the like of each single battery are obtained in the charge and discharge process of the terminal battery, and a pre-stored battery model or the charge and discharge relation is corrected according to the obtained parameters, so that the self-correction of a battery performance algorithm model is realized. And then adjusting and controlling the output quantity according to the corrected battery model or the charging and discharging relation. In addition, the current state of the terminal battery can be determined according to the acquired parameters so as to determine whether each single battery normally operates. In addition, the execution hardware (such as a power supply circuit, a temperature compensation execution end and the like due to device difference) of the regulation and control execution link of the terminal also has difference, in the terminal operation process, parameters of a regulation and control output quantity control algorithm and an actuator algorithm are corrected according to the actual regulation and control quantity execution effect obtained by feedback and the difference of a preset control effect, the parameter self-correction of a regulation and control output algorithm model and the parameter of the algorithm is completed, and then the output quantity control is executed according to the corrected regulation and control output algorithm model and the parameter of the algorithm.
Once the discharge loss deviation occurs, it means that the single batteries cannot complete discharge at the same time. In order to solve the above problem, in the embodiment of the present application, the mobile communication platform 101 determines, according to a relationship between each charge-discharge loss deviation value and a preset deviation threshold, that the balance power-supply module 105 supplies power to the corresponding single battery.
In addition, the temperature detection module 106 is connected to the battery temperature detection ends of the plurality of single batteries, and is configured to obtain the temperatures of the plurality of single batteries in real time. The mobile communication platform 101 is configured to determine whether the temperatures of the plurality of single batteries are lower than a preset threshold, trigger the temperature compensation module 107 to compensate the temperatures of the plurality of single batteries, and send a temperature compensation stopping command to the temperature compensation module 107 according to a temperature corresponding to a longest discharge time in a pre-stored battery charge-discharge relationship, so that the problem that the batteries cannot normally operate at a low temperature is solved. It should be noted that the temperature compensation module 107 is internally provided with a multi-stage regulated output circuit assembly, a heating device, and a cooling device, such as a thin film heating plate and a semiconductor cooling plate with a temperature open-circuit protection function. If have wireless thing networking terminal that charges, can multiplexing wireless charging coil as the device that generates heat, the modulation generates heat, further improves the performance flexibility that the scheme realized. The temperature compensation module 107 can increase the temperature of the battery or the terminal at a low temperature to improve the discharging performance of the battery and the use performance of the terminal.
It should be noted that, in a high temperature environment, for example, above 45 ℃, the terminal may limit the charging current, and 60 ℃ may prohibit charging. Under the high temperature environment, the terminal can reduce the power supply management output, especially the mobile communication radio frequency power reduces, leads to mobile communication speed to descend, influences terminal performance. Therefore, in the embodiment of the present application, the temperature compensation module 107 may be optimized, so that the temperature compensation module 107 cools the terminal battery at a high temperature, and the terminal battery may adapt to more application scenarios.
The mobile communication platform 101 is further configured to determine a current discharging time and a corresponding preset discharging termination time in the battery charging and discharging relationship according to the current detected by the electric quantity detection module 102 and the temperature obtained by the temperature detection module 106. And determining corresponding residual discharge time according to the current discharge time and the discharge termination time, and displaying the residual discharge time to realize real-time correction of the discharge time.
For the charging process, the electric quantity monitoring module monitors the total charging voltage, charging capacity, charging energy and charging current of the terminal in real time, the battery voltage detection module 104 monitors the voltage of the corresponding single battery in real time, and the battery temperature detection module 106 monitors the battery temperature in real time. The mobile communication platform 101 is configured to determine a residual capacity and a residual energy of each single battery according to the voltage of the corresponding single battery from the voltage detection module 104 and the charging voltage, the charging capacity, the charging energy and the charging current of the plurality of single batteries from the power detection module 102, and determine a charging loss deviation value of each single battery according to the residual capacity and the residual energy of each single battery and a pre-stored battery charging-discharging relationship. The charging loss deviation value is the difference between the maximum remaining capacity of each single battery and any other remaining capacity.
The charging loss deviation of the series battery can be caused by the accumulation of battery core difference, self-discharge, charge and discharge and the like. Once the charging loss deviation occurs, which means that some single batteries are not fully charged, in order to solve the above problem, in this embodiment of the present application, the mobile communication platform 101 determines to trigger the balancing and recharging module 105 to recharge the corresponding single battery according to a relationship between each charging loss deviation value and a preset deviation threshold.
In summary, the mobile communication platform 101 can dynamically correct the discharge electric quantity and the electric quantity metering according to the charge-discharge loss deviation between each point, so as to realize accurate monitoring of the dynamic electric quantity. Meanwhile, the mobile communication platform 101 judges that each single battery has a discharge loss deviation according to various charging and discharging curves corresponding to the actual discharge electric quantity, the voltage, the capacity and the energy of each battery and the fitted multi-temperature point, if the deviation occurs, the mobile communication platform triggers the balance power supply module 105 to supply power to the corresponding single battery, so that the output energy of each battery is dynamically adjusted, and the power supply and the battery of the internet of things terminal are accurately and dynamically monitored, managed and protected. Even if the performance and the model of each single battery are different in series connection, the performance of each battery can be fully exerted, so that the normal operation of the Internet of things terminal in various application scenes and temperature environments is guaranteed, the accurate monitoring of dynamic electric quantity can be realized, and the accuracy of monitoring and metering of the electric quantity of the terminal in various application scenes is improved.
In addition, the mobile communication platform 101 may further determine a current charging time and a corresponding preset charging termination time in the battery charging and discharging relationship according to the current detected by the electric quantity detection module 102 and the temperature obtained by the temperature detection module 106. And determining corresponding residual charging time according to the current charging time and the charging termination time, and displaying the residual charging time so as to realize real-time correction of the charging time.
In this embodiment, the battery cannot be normally charged at low temperature, and in order to ensure normal charging at low temperature, the mobile communication platform 101 is configured to determine a charging current according to the temperature obtained by the temperature detection module 106, and charge the plurality of single batteries with the determined charging current. Meanwhile, the mobile communication platform 101 determines the power for charging the plurality of single batteries and the power for heating the plurality of single batteries respectively according to the temperature and the charging current detected by the temperature detection module 106.
In the embodiment of the present application, two single batteries are connected in series as an example, and a circuit diagram for supplying power to a mobile internet of things terminal suitable for a low temperature environment is provided, as shown in fig. 9, an operational amplifier U12A, R1, R2, and R3 form a battery I voltage sampling circuit corresponding to the voltage detection module 104. The non-inverting input end of the U12A is connected with the positive pole of the battery 1 through the R1, the inverting input end of the U12A is connected with the negative pole of the battery 1 through the R2, and the inverting input end of the U12A is connected with the output end of the U12A through the R3, so that a voltage differential sampling circuit of the battery 1 is formed. Similarly, the operational amplifier U12B, R4, R5 and R6 form a battery II voltage sampling circuit corresponding to the voltage detection module 104. The electricity meter Y is connected with the positive electrode of the battery I and is connected in series with a battery main power supply loop to form an electricity quantity sampling circuit corresponding to the electricity quantity detection module 102. The charging management chip U1 is connected in parallel at the positive and negative ends of the battery I, and the charging management chip U2 is connected in parallel at the positive and negative ends of the battery II to form a balance power supply circuit corresponding to the balance power supply module 105. The R7 is connected in series with the battery temperature sensor to form a battery temperature sampling circuit corresponding to the temperature detection module 106. The S pole of the Mos tube P1 is connected with R8 through R9, the other end of R8 is connected with the G pole of P1, the D pole of P1 is connected with L1, and the other end of L1 is connected with the ground, so that an execution function circuit of the temperature compensation module 107 is formed.
The embodiment of the present application provides a circuit diagram of a charge and discharge management module, as shown in fig. 10, a voltage control circuit is formed by a voltage regulation chip U3 and its accessory circuits, the output voltage of the circuit is regulated by a voltage reduction method, and a current control circuit is formed by a current regulation chip U4 and its accessory circuits, so as to adjust the power of a battery and a power supply to be effectively distributed to different components of a platform system and to manage charge and discharge.
The pin of the voltage regulation chip 1 is respectively connected with the anode of the diode V1 and one end of the inductor L1; a pin of the voltage regulation chip 2 is connected with the first digital potentiometer JT1 and is grounded; a pin of the voltage regulation chip 3 is respectively connected with one end of the resistor R10 and the first digital potentiometer JT 1; a pin 4 of the voltage regulation chip receives a chip selection signal CS 3; a pin 5 of the voltage regulation chip is respectively connected with a power supply and one end of a capacitor C1; and a pin 6 of the voltage regulation chip is connected with the other end of the capacitor C1 and the other end of the inductor L1.
A pin of the current regulation chip 1 is respectively connected with the other end of the resistor R10 and the cathode of the diode V1; the second digital potentiometer JT2 is connected to the current regulation chip 2 pin and the current regulation chip 3 pin, respectively.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.
Obviously, the invention is not limited to be used for the mobile internet of things terminal applicable to low-temperature environment, and can also be used for related applications of general communication terminals such as mobile phones and the like under the guidance of the idea of the invention.
While the present invention has been described with reference to the preferred embodiments and the accompanying drawings, the foregoing description is to be considered as illustrative and not restrictive in character, and that changes and modifications may be made by those skilled in the art without departing from the spirit of the invention.
Claims (9)
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Application publication date: 20200414 |