WO2015067088A1 - 终端电池温度检测装置，终端与过温保护方法 - Google Patents

终端电池温度检测装置，终端与过温保护方法 Download PDF

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WO2015067088A1
WO2015067088A1 PCT/CN2014/084952 CN2014084952W WO2015067088A1 WO 2015067088 A1 WO2015067088 A1 WO 2015067088A1 CN 2014084952 W CN2014084952 W CN 2014084952W WO 2015067088 A1 WO2015067088 A1 WO 2015067088A1
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temperature
battery
terminal
threshold
thermistor
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PCT/CN2014/084952
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English (en)
French (fr)
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张序
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中兴通讯股份有限公司
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Publication of WO2015067088A1 publication Critical patent/WO2015067088A1/zh

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
    • G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
    • G01K7/24—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor in a specially-adapted circuit, e.g. bridge circuit

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  • the present invention relates to the field of wireless data terminals, and more particularly to a terminal battery temperature detecting device, a terminal and an over temperature protection method.
  • the prior art and common practice of the battery temperature sampling problem are as follows:
  • the battery used in the terminal is mainly a lithium battery.
  • the usual method is to detect the battery temperature by NTC (Negative Temperature CoeffiCient, The thermistor) resistor, as shown in Figure 1, R1 is the NTC resistor.
  • the voltage between R1 and R2 is collected by the ADC sampling port.
  • the CPU will read the voltage corresponding to the truth table and read the corresponding temperature.
  • the battery stops charging and can be discharged normally.
  • it detects more than 60 degrees it will trigger shutdown.
  • the advantage of this solution is that the design is simple and low cost.
  • the main problem is that it may not accurately reflect the battery temperature, and directly shut down when the battery temperature rises to 60 degrees, and does not take other measures to reduce the user experience.
  • the battery temperature is likely to exceed 60 degrees, which is especially important for the accuracy of battery temperature sampling.
  • the terminal will enter the stop or shutdown state too early, if the actual temperature of the battery is 58 degrees, the terminal In the normal operating temperature range, the sampled value exceeds 60 degrees, resulting in a false shutdown; 2) If the location corresponds to a weak heat source on the motherboard, the CPU reads the temperature is too low, if the battery is actually When the temperature is more than 60 degrees, the terminal should trigger the over-temperature shutdown process, and the sampled value is lower than 60 degrees. The terminal will not shut down. This will cause the battery to work for more than 60 degrees for a long time. The battery has potential safety hazards and the reliability is greatly reduced. .
  • the true temperature of the battery may rise to more than 60 degrees, even if the sampled temperature reflects the true temperature of the battery, It will trigger a shutdown directly, reducing the user experience and posing a security risk.
  • the wireless data terminal has problems such as early or late shutdown caused by inaccurate sampling of the battery temperature, and an effective solution has not been proposed for this problem.
  • the embodiment of the invention provides a terminal battery temperature detecting device, a terminal and an over-temperature protection method, which are used to solve the problems of early or late shutdown caused by the inaccurate sampling of the battery temperature of the wireless data terminal in the prior art.
  • a terminal battery temperature detecting device is provided, and the following technical solutions are adopted:
  • the terminal battery temperature detecting device comprises: a pull-up resistor with a fixed resistance value, the first end is connected to the first voltage; the thermistor network, the first end is connected to the second voltage, and the second end is connected to the second pull-up resistor
  • the thermistor network includes a plurality of thermistors connected in series or in parallel with each other; the plurality of thermistors are respectively disposed on different heat-generating regions of the battery protection board of the terminal; the temperature collector is set The temperature value of the plurality of heat generating regions on the battery protection plate is obtained according to the voltage value across the pull-up resistor and the voltage value across the thermistor.
  • the temperature collector includes: a voltage collector configured to collect a voltage value across the pull-up resistor and a voltage value across the thermistor; and a controller configured to be based on the two ends of the pull-up resistor The voltage value and the voltage value across the thermistor are used to obtain temperature values of a plurality of heat generating regions on the battery protection panel.
  • a terminal is provided, and the following technical solutions are adopted:
  • the terminal includes the above-described terminal battery temperature detecting device.
  • a method for over-temperature protection of a terminal battery is provided, and the following technical solutions are adopted:
  • the terminal battery over-temperature protection method includes: averaging temperature values of the plurality of heat-generating regions on the battery protection board of the terminal to obtain an average temperature of the battery protection board; comparing the average temperature with a preset threshold to obtain a comparison result; controlling the terminal according to the comparison result to perform over-temperature protection on the battery corresponding to the battery protection board.
  • the preset threshold includes a first threshold and a second threshold, the first threshold is smaller than the second threshold; and the comparing the average temperature with a preset threshold comprises: The temperature is compared to the first threshold and the second threshold, respectively.
  • the controlling the terminal according to the comparison result comprises: when the comparison result indicates that the average temperature is greater than or equal to the first threshold and less than the second threshold, triggering the terminal A frequency down operation is performed to reduce the average temperature to less than the first threshold.
  • the step of controlling the terminal according to the comparison result comprises: when the comparison result indicates that the average temperature is greater than or equal to the second threshold, triggering a shutdown operation of the terminal.
  • the technical solution provided by the invention realizes more accurate sampling of the actual temperature of the battery by means of temperature sampling of the multi-point area on the battery protection board, and performs frequency reduction operation when the terminal battery is high temperature, thereby making the battery reliability and safety. It will be greatly enhanced, and the performance of the battery can be maximized, and the user experience of enhancing the battery life of the terminal can be achieved.
  • FIG. 1 is a schematic view showing sampling of a thermistor of a general battery protection board according to the background art of the present invention
  • FIG. 2 is a schematic structural diagram of a terminal battery temperature detecting device according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram showing sampling of a thermistor of a battery protection board in which a plurality of thermistors are connected in series according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of sampling a thermistor of a battery protection board in which a plurality of thermistors are connected in parallel according to an embodiment of the present invention
  • FIG. 5 is a comparison diagram of sampling temperature regions of a thermistor sampling method of a battery protection board according to an embodiment of the present invention and a thermistor sampling method of a general battery protection board described in the background art;
  • FIG. 6 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
  • FIG. 7 is a flow chart showing a method for over-temperature protection of a terminal battery according to an embodiment of the present invention.
  • FIG. 2 is a schematic structural diagram of a terminal battery temperature detecting apparatus according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram showing the sampling of the thermistor of the battery protection board in which a plurality of thermistors are connected in series according to the embodiment of the present invention.
  • FIG. 4 is a schematic diagram showing the sampling of the thermistor of the battery protection board in which the plurality of thermistors are connected in parallel according to the embodiment of the present invention.
  • the terminal battery temperature detecting device includes: a pull-up resistor R p with a fixed resistance value, a first end of the pull-up resistor R p is connected to the first voltage V p ; the thermistor network 20 is hot The first end of the resistive resistor network 20 is connected to the second voltage, and the second end of the thermistor network 20 is connected to the second end of the pull-up resistor R p ; the thermistor network 20 includes two series connected in parallel or in parallel with each other a plurality of thermistors R 1 /R 2 /R 3 /.../R N ; the plurality of thermistors R 1 /R 2 /R 3 /.../R N are respectively disposed on the battery protection board of the terminal
  • the temperature collector 30 is disposed according to a voltage value across the pull-up resistor R p and a voltage value across the thermistor R 1 /R 2 /R 3 /.../R N , The temperature values
  • the thermistor network 20 includes a plurality of thermistors R 1 /R 2 /R 3 /.../R N , R 1 /R 2 / R 3 / ... / R N is N identical negative temperature coefficient thermistor, N thermistor R 1 / R 2 / R 3 / ... / R N in each of a resistance R i are placed in the battery protection N different areas on the plate 10, if the N regions uneven heating, then the N thermistor R 1 / R 2 / R 3 / ...
  • each resistor R R N i is not the resistance the same, corresponding reflecting areas corresponding to different temperatures; the thermistor R 20 N thermistor network 1 / R 2 / R 3 / ... / R N can be connected in series or in parallel manner, since the battery is placed in Each of the thermistors R i in different regions on the protection board 10 has different resistance values due to different temperatures of the corresponding regions, so that the total resistance value of the thermistor network 20 is different.
  • thermistor network 20 By adding a pull-up resistor R p , R p to the battery protection board 10 as a fixed resistance value, placed on the printed circuit board (PCB), combined with N thermistors R 1 /R 2 /R 3 /.../R N
  • the thermistor network 20 connected in series or in parallel such that the thermistor network 20 and the pull-up resistor R p are common to the first voltage V p and the second voltage V dividing the difference voltage, i.e. the voltage difference between the voltage value of the thermistor network 20 across the voltage value across the pull-up resistor R and p.
  • the sampled battery temperature is made on the battery protection board 10 without increasing the battery interface and other hardware.
  • the temperature value of the plurality of heat-generating regions avoids the common method. Only one thermistor is used on the battery protection board 10, and only the temperature of the corresponding position can be reflected, thereby achieving the effect of temperature sampling on the multi-point area on the battery protection board 10.
  • the temperature collector 30 includes: a voltage collector configured to collect a voltage value across the pull-up resistor R p and both ends of the thermistor R 1 /R 2 /R 3 /.../R N a voltage value; the controller 50 is configured to obtain the battery protection according to a voltage value across the pull-up resistor R p and a voltage value across the thermistor R 1 /R 2 /R 3 /.../R N
  • the temperature collector 30 includes a voltage collector and a controller.
  • the voltage sampling circuit samples the divided voltage by a temperature sampling circuit, and the divided voltage is the two ends of the pull-up resistor R p .
  • the voltage value and the voltage value across the thermistor R 1 /R 2 /R 3 /.../R N are such that the voltage values across the thermistor R 1 /R 2 /R 3 /.../R N are obtained, ie each The voltage value across the thermistor R i ; through the controller, according to the voltage value across each of the sampled thermistors R i , and then against the "voltage - temperature" table, thereby obtaining N thermal on the battery protection board 10
  • the temperature values of the plurality of heat generating regions corresponding to the resistors R 1 /R 2 /R 3 /.../R N are examples of the plurality of heat generating regions corresponding to the resistors R 1 /R 2 /R 3 /.../R N .
  • Fig. 5 is a view showing a comparison of sampling temperature regions of a thermistor sampling method of a battery protection panel according to an embodiment of the present invention and a thermistor sampling method of a conventional battery protection panel described in the prior art.
  • the thermistor sampling method of the battery protection board 10 can only reflect the small area temperature in the inner area of the battery protection board 10, and cannot accurately reflect the overall temperature of the battery.
  • the small area temperature at this point is too high, If it is too low, it will affect the normal use of the wireless data terminal, and has limitations.
  • the temperature of the plurality of heat-generating regions in the large-area frame area on the board 10 is further calculated by further calculating the average temperature of the collected plurality of heat-generating areas, so that an average battery temperature of a larger area can be obtained, and the battery is more accurately sampled.
  • the temperature in order to achieve a more realistic reflection of the battery temperature, and low cost, easy to achieve.
  • FIG. 6 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
  • the terminal provided by the present invention includes the above-described terminal battery temperature detecting device.
  • the main body of the terminal includes three parts: first, a lithium battery, wherein the battery protection board includes the above-mentioned terminal battery temperature detecting device, the thermistor reflects a more realistic battery temperature; and the second: the battery The temperature sampling system is used to collect the voltage value of the pull-up resistor R p and the thermistor; third: the main CPU receives the voltage sent by the battery temperature sampling system and performs a "voltage-temperature" comparison for real-time Monitor battery temperature.
  • the above battery temperature sampling system has various forms, such as SMB358, with analog-to-digital converter (ADC) sampling function, and communicates with CPU using I2C interface; or uses Qualcomm PM8018 with ADC sampling function. , use the SSBI interface to communicate with the CPU; it can also be a simple ADC sampling circuit and so on.
  • FIG. 7 is a flow chart showing a method for over-temperature protection of a terminal battery according to an embodiment of the present invention.
  • the terminal battery is over-temperature protected based on the temperature values of the plurality of heat-generating areas on the battery protection board of the terminal detected by the terminal battery temperature detecting device, and the terminal battery over-temperature protection method includes:
  • S105 Control the terminal according to the comparison result to perform over-temperature protection on a battery corresponding to the battery protection board.
  • the N collected thermistor R 1 / R terminal via the battery temperature detection means 2 / R 3 / ... / R N regions corresponding to the plurality of heat generating temperature T R1 / T R2 / T R3 / ... / T RN in step S101, the average value of the temperature values T R1 /T R2 /T R3 /.../T RN of the plurality of heat generating regions is calculated by software design, thereby obtaining the region of the thermistor network on the battery protection board.
  • the average temperature value T a in step S103 , the calculated average temperature value T a of the battery protection panel is compared with the preset threshold value T p to obtain a comparison result, and the average temperature value T a is greater than or less than The preset threshold value T p ; in step S105, according to the result of comparing the average temperature value T a with the preset threshold value T p , the control terminal selects the shutdown or frequency reduction operation, so that the reliability and safety of the battery will be greatly improved. Enhanced.
  • the predetermined threshold value T p comprises a first threshold value T 1 and the second threshold value T 2, the first threshold value T 1 is less than the second threshold T 2; the average of the temperature T a and the pre-
  • the step of comparing the threshold value T p includes comparing the average temperature T a with the first threshold value T 1 and the second threshold value T 2 , respectively.
  • the controlling the terminal according to the comparison result comprises: when the comparison result indicates that the average temperature T a is greater than or equal to the first threshold T 1 and less than the second threshold T 2 And triggering a frequency down operation of the terminal to reduce the average temperature T a to be less than the first threshold T 1 .
  • the controlling the terminal according to the comparison result comprises: when the comparison result indicates that the average temperature T a is greater than or equal to the second threshold T 2 , triggering a shutdown operation of the terminal.
  • the sampled average battery temperature T a that is, the actual battery temperature rises to near the battery limit operating temperature At T h , it is necessary to reduce the temperature by means of hardware plus software.
  • the frequency reduction action of the terminal CPU is triggered, if the battery temperature T a is down-converted After still being higher than the first threshold T 1 of the preset threshold T p and less than the battery limit operating temperature T h , the frequency reduction continues, otherwise if the battery temperature T a falls to the first threshold of the preset threshold T p Below T 1 , the CPU frequency is restored; if the battery temperature T a is higher than the battery limit operating temperature T h, it is immediately turned off to ensure battery safety.
  • the CPU frequency is not directly reduced to a certain fixed frequency, but the frequency is gradually reduced step by step, and the user experience is maximized under the premise of ensuring the safe working temperature of the battery.
  • the battery pull-up resistor Rp and the thermistor's voltage divider value are collected by the battery temperature sampling system, and this value is sent to the CPU, and the CPU performs a "voltage-temperature" comparison to obtain a more accurate battery temperature.
  • the CPU performs the main frequency reduction (down to 90%), thereby reducing the power consumption of the whole machine and achieving the purpose of lowering the temperature; while reducing the frequency to 90% of the main frequency, the battery The temperature sampling system continues to perform real-time sampling of the battery temperature.
  • the main frequency returns to normal, and if it rises to the second threshold of 60 ° C, the shutdown is triggered immediately, if the temperature is at the first threshold of 58 ° C and the second threshold of 60 ° C The frequency will continue to decrease (down to 70%). Later, the battery temperature sampling system and the CPU act together, and the action of repeatedly reducing the main frequency is reduced to 60% and 50%. After the main frequency is reduced to 50%, the battery temperature sampling system continues to perform real-time sampling of the temperature, after that. At any time, if the temperature falls back below the first threshold of 58 ° C, the main frequency returns to normal. If it rises to the second threshold of 60 ° C, the shutdown is triggered immediately.
  • the temperature is between 58 ° C and the second threshold of 60 ° C, the temperature is maintained. Current status.
  • the technical solution provided by the invention realizes more accurate sampling of the actual temperature of the battery by means of temperature sampling of multiple points on the battery protection board, and performs frequency reduction operation when the terminal battery is high temperature, thereby making the battery reliable. Sex and safety will be greatly enhanced, and the performance of the battery can be maximized and the user experience of enhancing the battery life of the terminal can be achieved.
  • the above technical solution provided by the invention can be applied to the temperature detection process of the terminal battery, and the temperature of the multi-point area on the battery protection board is sampled to achieve more accurate sampling of the actual temperature of the battery, and the temperature of the terminal battery is lowered. Frequency operation, so that the reliability and safety of the battery will be greatly enhanced, the performance of the battery can be maximized, and the user experience of enhancing the battery life of the terminal can be achieved.

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  • General Physics & Mathematics (AREA)
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Abstract

一种终端电池温度检测装置与终端，用于更准确采样电池实际温度。该终端电池温度检测装置包括：阻值固定的上拉电阻，第一端接入第一电压；热敏电阻网络，第一端接入第二电压，第二端与所述上拉电阻的第二端连接；所述热敏电阻网络包括相互串联或相互并联的多个热敏电阻；所述多个热敏电阻分别设置于所述终端的电池保护板的不同发热区域上；温度采集器，设置为根据所述上拉电阻两端的电压值和所述热敏电阻两端的电压值，而得到所述电池保护板上的多个发热区域的温度值。采用上述技术方案，更准确采样电池实际温度，并对终端电池高温保护，从而使电池可靠性和安全性将大为增强。

Description

终端电池温度检测装置，终端与过温保护方法 技术领域
本发明涉及无线数据终端领域，更具体的，涉及一种终端电池温度检测装置，终端与过温保护方法。
背景技术
随着无线数据终端产品功能日益强大，产品的功耗也随之增加，再加上现在的趋势是轻、薄，整机发热特别是电池发热的问题也就越来越严重。电池发热的问题不仅直接影响无线数据终端用户的使用体验，而且还影响到产品的可靠性和用户的在使用中的人身安全性等问题。如何准确检测电池温度并在电池高温时进行保护而不是简单关机，在保证电池安全性的前提下，保证好的用户体验就变的尤为重要。
对于电池温度采样问题的现有技术和业界的通用做法，介绍如下：终端中使用的电池以锂电池为主，通常的做法是：检测电池温度是靠电池保护板上的NTC(Negative Temperature CoeffiCient，热敏电阻)电阻，参见图1所示，R1是NTC电阻，靠ADC采样端口采集R1和R2之间的电压，CPU将采集到的电压对应的真值表上，读出相应的温度。检测到45度到60度之间电池停止充电，可正常放电；检测到60度以上便触发关机。该方案的优点是设计简洁，低成本。但是存在的主要问题是有可能不能准确反映电池温度，并且在电池温度上升到60度时直接关机，并没有采取其他措施，降低了用户体验程度。
对于数据类的高速终端产品，电池温度很有可能超过60度，对于电池温度采样的准确性便尤为重要。常用的电池保护板上只有一个NTC电阻，当电池定制完成出厂后，NTC在电池保护板上的位置便固定了，在靠近连接器保护板上的某个位置，从而带来的一个问题是：该NTC电阻只能准确反映该位置的温度。在PCB设计时：1).如果该位置对应的主板上是强发热源，则CPU采样到的温度过高，终端会过早进入停充或关机状态，如果电池的实际温度为58度，终端处于正常工作温度范围，而采样的值却超过了60度，从而导致了误关机；2).如果该位置对应的主板上是弱发热源，则CPU读到的温度过低，如果电池的实际温度为超过60度，终端应当触发过温关机流程，而采样的值却低于60度，终端不会关机，这样会导致电池长时间工作在60度以上，电池存在安全隐患，可靠性大大降低。
另外，如果在环境温度较高(35度甚至以上)、或在功耗极限的情况下，电池的真实温度也可能上升到60度以上，这时即使采样的温度反映的是电池真实温度，也会直接触发关机，降低了用户体验，并且存在安全性风险。为了能够尽量准确的采集电池真实温度并对电池进行高温保护，第一，需要在对电池NTC电阻的采样方法提供一种新颖而简洁的方式，使得电池温度采样尽量反应电池的真实温度，而不是某一点的温度；第二，当环境温度较高、或在功耗极限的情况下导致电池整体温度很快上升，这时就需要用硬件加软件的方式降低温度，在尽量保证用户体验的前提下，保证整机的安全性；第三是PCB的合理布局，尽量使主板的热均衡，但现在终端的趋势是做小做薄，布局面积紧张，不可能完全兼顾。
因此，现有技术中，无线数据终端存在电池温度采样不准而带来的提前或滞后关机等问题，而对于该问题目前尚未提出有效的解决方案。
发明内容
本发明实施例提供一种终端电池温度检测装置，终端与过温保护方法，用于解决现有技术中，无线数据终端存在电池温度采样不准而带来的提前或滞后关机等问题。
为实现上述目的，根据本发明的一个实施例，提供一种终端电池温度检测装置，并采用以下技术方案：
终端电池温度检测装置包括：阻值固定的上拉电阻，第一端接入第一电压；热敏电阻网络，第一端接入第二电压，第二端与所述上拉电阻的第二端连接；所述热敏电阻网络包括相互串联或相互并联的多个热敏电阻；所述多个热敏电阻分别设置于所述终端的电池保护板的不同发热区域上；温度采集器，设置为根据所述上拉电阻两端的电压值和所述热敏电阻两端的电压值，而得到所述电池保护板上的多个发热区域的温度值。
优选地，所述温度采集器包括：电压采集器，设置为采集所述上拉电阻两端的电压值和所述热敏电阻两端的电压值；控制器，设置为根据所述上拉电阻两端的电压值和所述热敏电阻两端的电压值，而得到所述电池保护板上的多个发热区域的温度值。
根据本发明的第二实施例，提供一种终端，并采用如下技术方案：
该终端包括上述的终端电池温度检测装置。
根据本发明的第三实施例，提供一种终端电池过温保护方法，并采用如下技术方案：
终端电池过温保护方法包括：将终端的电池保护板上的多个发热区域的温度值进行平均，得到所述电池保护板的平均温度；将所述平均温度与预设阀值进行比较，得到一比较结果；根据所述比较结果控制所述终端，以对所述电池保护板对应的电池进行过温保护。
优选地，所述预设阈值包括第一阈值和第二阈值，所述第一阈值小于所述第二阈值；所述将所述平均温度与预设阀值进行比较步骤包括：将所述平均温度分别与所述第一阀值与所述第二阈值进行比较。
优选地，所述根据所述比较结果控制所述终端步骤包括：当所述比较结果表示所述平均温度大于或等于所述第一阀值且小于所述第二阈值时，触发所述终端的降频操作，以将所述平均温度降低至小于所述第一阀值。
优选地，所述根据所述比较结果控制所述终端步骤包括：当所述比较结果表示所述平均温度大于或等于所述第二阈值时，触发所述终端的关机操作。
本发明提供的技术方案，通过对电池保护板上多点区域进行温度采样的方式，实现更准确采样电池实际温度，并对终端电池高温时，进行降频操作，从而使电池可靠性和安全性将大为增强，电池的性能也可最大程度发挥，并达到增强终端电池使用时间的用户体验的效果。
附图说明
附图用来提供对本发明的进一步理解，构成本申请的一部分，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：
图1表示本发明背景技术中所述的通常电池保护板的热敏电阻采样示意图；
图2表示本发明实施例所述的终端电池温度检测装置的结构示意图；
图3表示本发明实施例所述的多个热敏电阻相互串联的电池保护板的热敏电阻采样示意图；
图4表示本发明实施例所述的多个热敏电阻相互并联的电池保护板的热敏电阻采样示意图；
图5表示本发明实施例所述的电池保护板的热敏电阻采样方法与背景技术中所述的通常电池保护板的热敏电阻采样方法采样温度区域对比图；
图6表示本发明实施例所述的终端的结构示意图；
图7表示本发明实施例所述的终端电池过温保护方法的流程图。
具体实施方式
以下结合附图对本发明的实施例进行详细说明，但是本发明可以由权利要求限定和覆盖的多种不同方式实施。
图2表示本发明实施例所述的终端电池温度检测装置的结构示意图。
图3表示本发明实施例所述的多个热敏电阻相互串联的电池保护板的热敏电阻采样示意图。
图4表示本发明实施例所述的多个热敏电阻相互并联的电池保护板的热敏电阻采样示意图。
参见图2至图4所示，终端电池温度检测装置包括：阻值固定的上拉电阻Rp，上拉电阻Rp的第一端接入第一电压Vp；热敏电阻网络20，热敏电阻网络20的第一端接入第二电压，热敏电阻网络20的第二端与所述上拉电阻Rp的第二端连接；所述热敏电阻网络20包括相互串联或相互并联的多个热敏电阻R1/R2/R3/…/RN；所述多个热敏电阻R1/R2/R3/…/RN分别设置于所述终端的电池保护板10的不同发热区域上；温度采集器30，设置为根据所述上拉电阻Rp两端的电压值和所述热敏电阻R1/R2/R3/…/RN两端的电压值，而得到所述电池保护板10上的多个发热区域的温度值。
具体的，通过在电池保护板10上增设一热敏电阻网络20，所述热敏电阻网络20包括多个热敏电阻R1/R2/R3/…/RN，R1/R2/R3/…/RN为N个相同的负温度系数热敏电阻，N个热敏电阻R1/R2/R3/…/RN中的每一个电阻Ri分别放置在电池保护板10上的N个不同区域，如果这N个区域发热不均匀，那么这N个热敏电阻R1/R2/R3/…/RN中的每一个电阻Ri的阻值则不相同，相应地反映了对应区域的温度不同；热敏电阻网络20中的N个热敏电阻R1/R2/R3/…/RN可采用串联或并联的连接方式，由于放置在电池保护板10上不同区域的每一个热敏电阻Ri因对应区域的温度不同而阻值不同，使得该热敏电阻网络20的总电阻值不同。通过在电池保护板10上增设一个上拉电阻Rp，Rp为固定阻值的电阻，放置在终端印制电路板(Printed Circuit Board，简称为PCB)上，结合将N个热敏电阻R1/R2/R3/…/RN串联或并联的热敏电阻网络20，使得该热敏电阻网络20与上拉电阻Rp共同对第一电压Vp和第二电压V之间的差值电压进行分压，即差值电压值为热敏电阻网络20两端的电压值与上拉电阻Rp两端的电压值之和。通 过在电池保护板10上增设一个温度采集器30，使得可根据上拉电阻Rp两端的电压值和热敏电阻R1/R2/R3/…/RN两端的电压值，而得到电池保护板10上的多个发热区域的温度值。
在本实施例的上述技术方案中，通过在电池保护板10上增设一热敏电阻网络20，在不增加电池接口和其他硬件的条件下，使得采样到的电池温度为电池保护板10上的多个发热区域的温度值，避免了常用的方法电池保护板10上只用一个热敏电阻，只能反映对应位置的温度，从而达到对电池保护板10上多点区域进行温度采样的效果。
优选地，所述温度采集器30包括：电压采集器，设置为采集所述上拉电阻Rp两端的电压值和所述热敏电阻R1/R2/R3/…/RN两端的电压值；控制器50设置为根据所述上拉电阻Rp两端的电压值和所述热敏电阻R1/R2/R3/…/RN两端的电压值，而得到所述电池保护板10上的多个发热区域的温度值。
针对该实施例，更具体而言，即温度采集器30包括电压采集器与控制器，通过电压采集器，由温度采样电路对分压电压进行采样，分压电压为上拉电阻Rp两端的电压值和热敏电阻R1/R2/R3/…/RN两端的电压值，使得获得热敏电阻R1/R2/R3/…/RN两端的电压值，即每一个热敏电阻Ri两端的电压值；通过控制器，根据采样到的每一个热敏电阻Ri两端的电压值，然后对照“电压-温度”表，从而得到电池保护板10上N个热敏电阻R1/R2/R3/…/RN对应的多个发热区域的温度值。
图5表示本发明实施例所述的电池保护板的热敏电阻采样方法与背景技术中所述的通常电池保护板的热敏电阻采样方法采样温度区域对比图。
参见图5所示，通常电池保护板10的热敏电阻采样方法只能反映电池保护板10上框内区域内小面积的温度，不能准确反映电池总体温度，当这个点的小面积温度过高或过低时，都会影响无线数据终端正常的使用，具有局限性；采用本实施例的上述技术方案，通过在电池保护板10上增设一热敏电阻网络20，这样的设计使得可以得到电池保护板10上大面积框内区域内多个发热区域的温度，通过进一步对采集到的多个发热区域的温度进行平均值计算，使得可以获得较大面积的平均电池温度，更加准确的采样到电池温度，从而达到更加真实的反映电池温度的效果，并且成本低，易实现。
图6表示本发明实施例所述的终端的结构示意图。
参见图6所示，本发明提供的终端包括上述的终端电池温度检测装置。
在本实施例的上述技术方案中，终端的主体包括三部分：第一，锂电池，其中电池保护板包括上述的终端电池温度检测装置，热敏电阻反映更加真实的电池温度；第二：电池温度采样系统，用来采集上拉电阻Rp和热敏电阻的分压值；第三：主CPU,接收到电池温度采样系统送来的电压，并进行“电压-温度”对照，用来实时监控电池温度。上述电池温度采样系统有多种形式，例如SMB358，有模数转换器(Analog-Digital Converter，简称为ADC)采样功能，与CPU之间使用I2C接口进行通讯；或使用高通PM8018，有ADC采样功能，与CPU之间使用SSBI接口进行通讯；也可以是单纯的ADC采样电路等等。通过上述的方案，使得能够更加准确的采样到终端设备的电池温度，从而达到提高终端安全性的效果。
图7表示本发明实施例所述的终端电池过温保护方法的流程图。
参见图7所示，基于上述的终端电池温度检测装置检测到的终端的电池保护板上的多个发热区域的温度值，对终端电池进行过温保护，终端电池过温保护方法包括：
S101：将终端的电池保护板上的多个发热区域的温度值TR1/TR2/TR3/…/TRN进行平均，得到所述电池保护板的平均温度Ta；
S103：将所述平均温度Ta与预设阀值Tp进行比较，得到一比较结果；
S105：根据所述比较结果控制所述终端，以对所述电池保护板对应的电池进行过温保护。
具体的，通过上述终端电池温度检测装置采集到N个热敏电阻R1/R2/R3/…/RN对应的多个发热区域的温度值TR1/TR2/TR3/…/TRN，在步骤S101中通过软件设计对上述多个发热区域的温度值TR1/TR2/TR3/…/TRN进行平均值计算，从而得到电池保护板上热敏电阻网络所在区域的平均温度值Ta；在步骤S103中，将计算所得电池保护板的平均温度值Ta与预设阀值Tp进行温度值大小的比较，得到一比较结果,平均温度值Ta大于或小于预设阀值Tp；在步骤S105中，根据上述平均温度值Ta与预设阀值Tp比较的结果，控制终端选择关机或降频操作，从而使电池可靠性和安全性将大为增强。
优选地，所述预设阈值Tp包括第一阈值T1和第二阈值T2，所述第一阈值T1小于所述第二阈值T2；所述将所述平均温度Ta与预设阀值Tp进行比较步骤包括：将所述平均温度Ta分别与所述第一阀值T1与所述第二阈值T2进行比较。
优选地，所述根据所述比较结果控制所述终端步骤包括：当所述比较结果表示所述平均温度Ta大于或等于所述第一阀值T1且小于所述第二阈值T2时，触发所述终端的降频操作，以将所述平均温度Ta降低至小于所述第一阀值T1。
优选地，所述根据所述比较结果控制所述终端步骤包括：当所述比较结果表示所述平均温度Ta大于或等于所述第二阈值T2时，触发所述终端的关机操作。
针对该实施例，更具体而言，当环境温度较高(35度甚至以上)、或在功耗极限的情况下，采样到的平均电池温度Ta即实际电池温度上升到接近电池极限工作温度Th时，就需要用硬件加软件的方式降低温度。当采样到的电池温度Ta升高到预设阀值Tp的第一阀值T1且小于第二阈值T2的时候，触发终端CPU的降频动作，如果电池温度Ta在降频后仍然高于预设阀值Tp的第一阀值T1并小于电池极限工作温度Th，则继续降频，否则如果电池温度Ta降到预设阀值Tp的第一阀值T1以下则恢复CPU主频；如果电池温度Ta高于电池极限工作温度Th则立刻关机，保证电池安全性。在开始降频的过程中，并不是直接将CPU主频降到某一个固定的频率，而是分步逐渐降低频率，在保证电池安全工作温度的前提下，最大化的保证用户体验。
首先由电池温度采样系统采集到电池上拉电阻Rp和热敏电阻的分压值，并把这个值送到CPU中，CPU进行“电压-温度”对照，从而获得更为准确的电池温度。当电池温度达到第一阀值58℃时，CPU进行降低主频动作(降低到90％)，从而降低整机功耗，达到降低温度的目的；在降低到主频90％的状态下，电池温度采样系统继续进行电池温度的实时采样，1)如果在M秒内温度回落到第一阀值58℃以下，则主频恢复正常；2)如果电池温度上升到第二阈值60℃则立即触发关机；3)在M秒内如果温度维持在第一阀值58℃和第二阈值60℃之间则会继续降低主频(降低到80％)，电池温度采样系统继续进行温度的实时采样，如果在M秒内温度回落到第一阀值58℃以下，则主频恢复正常，如果上升到第二阈值60℃则立即触发关机，如果温度在第一阀值58℃和第二阈值60℃之间则会继续降低主频(降低到70％)。后面由电池温度采样系统及CPU一起动作，重复降低主频的动作，一直降低到60％、50％，在主频降低到50％后，电池温度采样系统继续进行温度的实时采样，在之后的任意时间内，温度回落到第一阀值58℃以下，则主频恢复正常，如果上升到第二阈值60℃则立即触发关机，如果温度在58℃和第二阈值60℃之间则维持在当前状态。通过上述终端电池高温时降频系统的方案，对采样到更为准确的电池温度，在保证电池安全工作温度的前提下，最大化的保证了终端性能，提高了用户体验。
本发明提供的技术方案，通过对电池保护板上多点区域进行温度采样的方式，实现更准确采样电池实际温度，并对终端电池高温时，进行降频操作，从而使电池可靠 性和安全性将大为增强，电池的性能也可最大程度发挥，并达到增强终端电池使用时间的用户体验的效果。
以上所述是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明所述原理的前提下，还可以作出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。
工业实用性
本发明提供的上述技术方案，可以应用于终端电池温度检测过程中，通过对电池保护板上多点区域进行温度采样的方式，实现更准确采样电池实际温度，并对终端电池高温时，进行降频操作，从而使电池可靠性和安全性将大为增强，电池的性能也可最大程度发挥，并达到增强终端电池使用时间的用户体验的效果。

Claims (7)

  1. 一种终端电池温度检测装置，包括：
    阻值固定的上拉电阻，第一端接入第一电压；
    热敏电阻网络，第一端接入第二电压，第二端与所述上拉电阻的第二端连接；所述热敏电阻网络包括相互串联或相互并联的多个热敏电阻；所述多个热敏电阻分别设置于所述终端的电池保护板的不同发热区域上；
    温度采集器，设置为根据所述上拉电阻两端的电压值和所述热敏电阻两端的电压值，而得到所述电池保护板上的多个发热区域的温度值。
  2. 如权利要求1所述的终端电池温度检测装置，其中，所述温度采集器包括：
    电压采集器，设置为采集所述上拉电阻两端的电压值和所述热敏电阻两端的电压值；
    控制器，设置为根据所述上拉电阻两端的电压值和所述热敏电阻两端的电压值，而得到所述电池保护板上的多个发热区域的温度值。
  3. 一种终端，包括权利要求1或2所述的终端电池温度检测装置。
  4. 一种终端电池过温保护方法，基于如权利要求1或2所述的终端电池温度检测装置检测到的终端的电池保护板上的多个发热区域的温度值，对终端电池进行过温保护，所述终端电池过温保护方法包括：
    将终端的电池保护板上的多个发热区域的温度值进行平均，得到所述电池保护板的平均温度；
    将所述平均温度与预设阀值进行比较，得到一比较结果；
    根据所述比较结果控制所述终端，以对所述电池保护板对应的电池进行过温保护。
  5. 如权利要求4所述的终端电池保护方法，其中，所述预设阈值包括第一阈值和第二阈值，所述第一阈值小于所述第二阈值；
    所述将所述平均温度与预设阀值进行比较步骤包括：
    将所述平均温度分别与所述第一阀值与所述第二阈值进行比较。
  6. 如权利要求5所述的终端电池保护方法，其中，所述根据所述比较结果控制所述终端步骤包括：
    当所述比较结果表示所述平均温度大于或等于所述第一阀值且小于所述第二阈值时，触发所述终端的降频操作，以将所述平均温度降低至小于所述第一阀值。
  7. 如权利要求5或6所述的终端电池保护方法，其中，所述根据所述比较结果控制所述终端步骤包括：
    当所述比较结果表示所述平均温度大于或等于所述第二阈值时，触发所述终端的关机操作。
PCT/CN2014/084952 2013-11-07 2014-08-21 终端电池温度检测装置，终端与过温保护方法 WO2015067088A1 (zh)

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CN107453424A (zh) * 2017-07-24 2017-12-08 江西优特汽车技术有限公司 双芯模组采样线束及车载电池的采样充电电路
CN107968232A (zh) * 2017-11-20 2018-04-27 北京长城华冠汽车科技股份有限公司 唤醒电路及电池管理系统
CN110553747A (zh) * 2019-08-30 2019-12-10 华为技术有限公司 检测电气设备热失控的装置、方法及系统
CN110793660A (zh) * 2019-11-08 2020-02-14 锐迪科微电子（上海）有限公司 电池温度检测电路
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