CN202471837U - A battery internal resistance measuring circuit - Google Patents
A battery internal resistance measuring circuit Download PDFInfo
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Abstract
本实用新型提供了一种电池内阻测量电路，其包括交流输入模块、直流输入模块、采样电阻、测量单元、采样模块和变换处理模块。利用直流输入模块构建一个60mA的直流恒流电路，然后在此恒流电路中利用交流输入模块施加一个1000Hz、50mA的正弦波交流信号，然后采集恒流电路中采样电阻上的电压，经过电路变换，测量出测量单元所接电池的内阻。其结构简单，测量过程对电池本身伤害小，测量时间短，精度高，可以同时对若干电池进行测量，相对常规的交流内阻测量法更节省硬件资源。
The utility model provides a battery internal resistance measuring circuit, which comprises an AC input module, a DC input module, a sampling resistor, a measuring unit, a sampling module and a conversion processing module. Use the DC input module to build a 60mA DC constant current circuit, and then use the AC input module to apply a 1000Hz, 50mA sine wave AC signal to this constant current circuit, and then collect the voltage on the sampling resistor in the constant current circuit, and convert it through the circuit , measure the internal resistance of the battery connected to the measuring unit. Its structure is simple, the measurement process has little damage to the battery itself, the measurement time is short, and the accuracy is high. It can measure several batteries at the same time. Compared with the conventional AC internal resistance measurement method, it saves hardware resources.
Description
技术领域 technical field
本实用新型涉及一种测量电路，尤其涉及一种电池内阻测量装置。The utility model relates to a measuring circuit, in particular to a battery internal resistance measuring device.
背景技术 Background technique
蓄电池在日常生活应用广泛，为满足使用需求，常常将多个蓄电池串联成蓄电池组，供大功耗的设备使用。在蓄电池组中某些单体蓄电池的状态劣化直接影响蓄电池组整体的容量状态，也即蓄电池组的整体容量状态是由系统中某一只或几只劣化状态最严重的蓄电池容量决定。所以，准确测量各个单体电池的状态对防止蓄电池组故障是必要的。Batteries are widely used in daily life. In order to meet the needs of use, multiple batteries are often connected in series to form a battery pack for use in equipment with high power consumption. The state deterioration of some single batteries in the battery pack directly affects the overall capacity state of the battery pack, that is, the overall capacity state of the battery pack is determined by the capacity of one or several batteries in the most severely degraded state in the system. Therefore, accurate measurement of the state of individual cells is necessary to prevent battery pack failure.
目前一种蓄电池内阻测量方法为交流注入法，在测量过程中不需蓄电池进行放电，可以实现安全在线监测电池内阻，故不会对蓄电池的性能造成影响。然而，其缺陷在于需要测量交流电流信号和电压相应信号以及电压和电流之间的相位差，需要在MCU中实现三角函数计算等，因此采用的硬件电路及算法比较复杂，而且容易受到外界的干扰，影响测量精度。At present, a battery internal resistance measurement method is the AC injection method. During the measurement process, the battery does not need to be discharged, and the battery internal resistance can be monitored safely online, so the performance of the battery will not be affected. However, its disadvantage is that it needs to measure the AC current signal and the voltage corresponding signal and the phase difference between the voltage and current, and it needs to realize the calculation of trigonometric functions in the MCU, etc., so the hardware circuit and algorithm used are relatively complicated, and it is easy to be interfered by the outside world. , affecting the measurement accuracy.
实用新型内容 Utility model content
有鉴于此，有必要针对上述问题，提供一种结构简单且测量精确的电阻测量电路。In view of this, it is necessary to provide a resistance measuring circuit with simple structure and accurate measurement to solve the above problems.
为达到上述目的，本实用新型采用以下技术方案：In order to achieve the above object, the utility model adopts the following technical solutions:
一种电池内阻测量电路，其特征在于，包括：A battery internal resistance measurement circuit, characterized in that it comprises:
交流输入模块，用于向测量电路提供交流输入信号；An AC input module is used to provide an AC input signal to the measurement circuit;
直流输入模块，用于向测量电路提供直流输入信号；A DC input module, configured to provide a DC input signal to the measurement circuit;
采样电阻，用于作为测量电路的负载，方便信号采样；The sampling resistor is used as the load of the measuring circuit to facilitate signal sampling;
测量单元，包括正极测量端和负极测量端，用于接入电池，进行测量；A measuring unit, including a positive measuring terminal and a negative measuring terminal, is used to connect to the battery for measurement;
采样模块，用于采集采样电阻的电压；The sampling module is used to collect the voltage of the sampling resistor;
变换处理模块，用于对采样模块采集到的电压信号进行变换处理，处理为可直接读取的数值；The transformation processing module is used to transform and process the voltage signal collected by the sampling module, and process it into a directly readable value;
直流输入模块、采样电阻和测量单元构成一个闭合回路，采样电阻一端电连接于测量单元的负极测量端，另一端接地和直流输入模块；交流输入模块连接于正极测量端，采样模块电连接于负极测量端，变换处理模块与采样模块电连接。The DC input module, the sampling resistor and the measuring unit form a closed loop. One end of the sampling resistor is electrically connected to the negative measuring terminal of the measuring unit, and the other end is grounded to the DC input module; the AC input module is connected to the positive measuring terminal, and the sampling module is electrically connected to the negative terminal. At the measurement end, the transformation processing module is electrically connected to the sampling module.
所述交流输入模块输出1000Hz、50mA的正弦波交流信号，所述直流输入模块输出60mA的直流恒流信号。The AC input module outputs a 1000Hz, 50mA sine wave AC signal, and the DC input module outputs a 60mA DC constant current signal.
本实用新型通过构建一个60mA的直流恒流电路，然后在此恒流电路中施加一个1000Hz、50mA的正弦波交流信号，然后采集恒流电路中采样电阻上的电压，经过电路变换，测量出测量单元所接电池的内阻。其结构简单，测量过程对电池本身伤害小，测量时间短，精度高，可以同时对若干电池进行测量，相对常规的交流内阻测量法更节省硬件资源。The utility model builds a 60mA DC constant current circuit, then applies a 1000Hz, 50mA sine wave AC signal to the constant current circuit, then collects the voltage on the sampling resistor in the constant current circuit, and measures the measured The internal resistance of the battery connected to the unit. Its structure is simple, the measurement process has little damage to the battery itself, the measurement time is short, and the accuracy is high. It can measure several batteries at the same time. Compared with the conventional AC internal resistance measurement method, it saves hardware resources.
附图说明 Description of drawings
图1是本实用新型的电路模块示意图。Fig. 1 is a schematic diagram of a circuit module of the present invention.
具体实施方式 Detailed ways
下面将结合附图和具体的实施例对本实用新型做进一步的详细说明。The utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
如图1所示的一种电池内阻测量电路，其包括：A battery internal resistance measurement circuit as shown in Figure 1, which includes:
交流输入模块，用于向测量电路提供交流输入信号；An AC input module is used to provide an AC input signal to the measurement circuit;
直流输入模块，用于向测量电路提供直流输入信号；A DC input module, configured to provide a DC input signal to the measurement circuit;
采样电阻，用于作为测量电路的负载，方便信号采样；The sampling resistor is used as the load of the measuring circuit to facilitate signal sampling;
测量单元，包括正极测量端和负极测量端，用于接入电池，进行测量；A measuring unit, including a positive measuring terminal and a negative measuring terminal, is used to connect to the battery for measurement;
采样模块，用于采集采样电阻的电压；The sampling module is used to collect the voltage of the sampling resistor;
变换处理模块，用于对采样模块采集到的电压信号进行变换处理，处理为可直接读取的数值；The transformation processing module is used to transform and process the voltage signal collected by the sampling module, and process it into a directly readable value;
直流输入模块、采样电阻和测量单元构成一个闭合回路，采样电阻一端电连接于测量单元的负极测量端，另一端接地和直流输入模块；交流输入模块连接于正极测量端，采样模块电连接于负极测量端，变换处理模块与采样模块电连接。The DC input module, the sampling resistor and the measuring unit form a closed loop. One end of the sampling resistor is electrically connected to the negative measuring terminal of the measuring unit, and the other end is grounded to the DC input module; the AC input module is connected to the positive measuring terminal, and the sampling module is electrically connected to the negative terminal. At the measurement end, the transformation processing module is electrically connected to the sampling module.
所述交流输入模块输出1000Hz、50mA的正弦波交流信号，所述直流输入模块输出60mA的直流恒流信号。The AC input module outputs a 1000Hz, 50mA sine wave AC signal, and the DC input module outputs a 60mA DC constant current signal.
使用时，将电池或电池组按正确的极性接入到测量单元中。直流输入模块和交流输入模块向电池发出激励信号后，采样模块采集采样电阻的电压，再将其输入到变换处理模块，变换处理模块中的变换电路对该电压值进行变换处理，成为可直接读取的数值。When using, connect the battery or battery pack into the measuring unit according to the correct polarity. After the DC input module and the AC input module send excitation signals to the battery, the sampling module collects the voltage of the sampling resistor, and then inputs it to the conversion processing module, and the conversion circuit in the conversion processing module converts the voltage value to become a directly readable The value taken.
以上所述实施例仅表达了本实用新型的几种实施方式，其描述较为具体和详细，但并不能因此而理解为对本实用新型专利范围的限制。应当指出的是，对于本领域的普通技术人员来说，在不脱离本实用新型构思的前提下，还可以做出若干变形和改进，这些都属于本实用新型的保护范围。因此，本实用新型专利的保护范围应以所附权利要求为准。The above-mentioned embodiments only express several implementations of the utility model, and the description thereof is relatively specific and detailed, but it should not be construed as limiting the patent scope of the utility model. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the scope of protection of the utility model patent should be based on the appended claims.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012200210839U CN202471837U (en) | 2012-01-16 | 2012-01-16 | A battery internal resistance measuring circuit |
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| CN2012200210839U CN202471837U (en) | 2012-01-16 | 2012-01-16 | A battery internal resistance measuring circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998538A (en) * | 2012-11-09 | 2013-03-27 | 安凯 | Internal resistance measurement interference removal method for storage battery |
| CN109031154A (en) * | 2018-10-26 | 2018-12-18 | 深圳市新威尔电子有限公司 | High accuracy battery AC internal Resistance detection device |
| CN110441704A (en) * | 2019-07-23 | 2019-11-12 | 广州供电局有限公司 | Battery detection circuit |
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2012
- 2012-01-16 CN CN2012200210839U patent/CN202471837U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102998538A (en) * | 2012-11-09 | 2013-03-27 | 安凯 | Internal resistance measurement interference removal method for storage battery |
| CN109031154A (en) * | 2018-10-26 | 2018-12-18 | 深圳市新威尔电子有限公司 | High accuracy battery AC internal Resistance detection device |
| CN110441704A (en) * | 2019-07-23 | 2019-11-12 | 广州供电局有限公司 | Battery detection circuit |
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Granted publication date: 20121003 Termination date: 20130116 |