WO2020107903A1 - 电池组电压采样电路及方法、系统 - Google Patents
电池组电压采样电路及方法、系统 Download PDFInfo
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- WO2020107903A1 WO2020107903A1 PCT/CN2019/097051 CN2019097051W WO2020107903A1 WO 2020107903 A1 WO2020107903 A1 WO 2020107903A1 CN 2019097051 W CN2019097051 W CN 2019097051W WO 2020107903 A1 WO2020107903 A1 WO 2020107903A1
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- voltage sampling
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- the present invention relates to the technical field of power management systems, and in particular, to a battery pack voltage sampling circuit, method, and system.
- the voltage sampling of the battery pack is a relatively important part of the battery management system (BATTERY MANAGEMENT SYSTEM, referred to as BMS). This voltage is a key indicator for measuring the remaining capacity (State) of Charge, referred to as SOC.
- SOC remaining capacity
- the current commonly used voltage sampling circuit shown in Figure 1 is to directly connect a resistor in parallel to the battery pack, and obtain the voltage of the battery pack through the principle of resistor series voltage division. This sampling method has the following three disadvantages:
- the resistance (R1, R2, R3, R4) in the circuit is relatively large, but because it has been connected in parallel to the battery pack, there will be a certain power loss;
- the sampling accuracy of the sampling circuit needs to be improved, and the reliability of the sampling circuit is also improved.
- At least some embodiments of the present invention provide a battery pack voltage sampling circuit, method, and system to solve the technical problems of low sampling accuracy and poor reliability of existing sampling circuits.
- a battery pack voltage sampling circuit including at least two voltage sampling loops, and each of the voltage sampling loops includes: the same battery pack and at least one resistor connected in parallel with the battery pack And at least one controllable logic switch, wherein the resistance of each voltage sampling loop includes a sampling resistor for voltage sampling; each controllable logic switch has a first state that disconnects all the voltage sampling loops, And a second state in which each of the voltage sampling circuits is independently connected.
- each of the voltage sampling loops includes: a plurality of resistors connected in series with each other and connected in parallel with the battery pack; the at least one controllable logic switch arranged in series with the sampling in the plurality of resistors Between the resistor and other resistors.
- each of the voltage sampling loops includes the same sampling resistor, and the total resistance of each voltage sampling loop is different.
- the battery voltage sampling circuit includes two voltage sampling loops.
- the two voltage sampling loops include a first voltage sampling loop and a second voltage sampling loop, wherein the first voltage sampling loop includes a first resistor group and a ninth resistor arranged in series; the second voltage The sampling loop includes a second resistance group and the ninth resistance arranged in series, wherein the ninth resistance is the sampling resistance, and the first resistance and the second resistance group respectively include a plurality of resistances arranged in series.
- controllable logic switch includes a relay and/or a MOS transistor.
- a battery management system including the battery pack voltage sampling circuit.
- the controller further includes at least one of the following modules: a trigger module configured to trigger a state of a controllable logic switch; and a voltage sampling module configured to obtain a sampling of the sampling resistance Voltage value; the calculation module is set to calculate the voltage value of the battery pack.
- a battery pack voltage sampling method including: providing at least two voltage sampling loops, wherein each of the voltage sampling loops includes at least one resistor and at least one parallel to the battery pack Controllable logic switch; when the voltage sampling loop does not require sampling, control each of the controllable logic switches to be in the first state of disconnecting all the voltage sampling loops, and when the voltage sampling loop needs sampling, control each The controllable logic switch is in a second state in which the voltage sampling circuits are independently connected.
- the battery pack voltage sampling method further includes: controlling to obtain each of the voltage sampling loops separately The sampling voltage of the sampling resistor in, wherein at least one resistor in each of the voltage sampling loops includes the sampling resistor; according to the total resistance of all the resistors in each of the voltage sampling loops, each sampling resistor Resistance value and each sampled voltage value to calculate the resistance value of a plurality of battery packs; based on the resistance value of the plurality of battery packs and the number of samplings, the average resistance value of the battery pack is calculated.
- controllable logic switch added to the voltage sampling circuit can be switched as needed, and each voltage sampling circuit is closed when sampling is needed, and the voltage sampling circuit is opened when sampling is not needed.
- the control method can eliminate the unnecessary power consumption generated by the resistance of the circuit in most of the time (no sampling period), and at the same time add a voltage sampling loop, which can improve the accuracy and accuracy of the sampling voltage, and can also improve the sampling Circuit reliability.
- FIG. 1 is a schematic diagram of a common voltage sampling circuit according to the prior art
- FIG. 2 is a schematic diagram of a logic controllable battery pack voltage sampling circuit according to an embodiment of the present invention.
- FIG. 1 is a schematic diagram of a common voltage sampling loop according to the prior art.
- the common voltage sampling loop generally calculates the battery pack through the principle of resistance voltage division The voltage.
- the voltage sampling circuit currently in common use as shown in FIG. 1 above mainly obtains the voltage of the battery pack by directly connecting a resistor in parallel to the battery pack, and by using the principle of resistor series voltage division.
- This sampling method will have the following three shortcomings: 1.
- the resistance of the circuit (R1, R2, R3, R4) is relatively large, but because it has been connected in parallel to the battery pack, there will be a certain power loss; 2.
- the sampling error caused by the resistance error of the resistor itself will be relatively low in sampling accuracy. 3.
- failure of any one resistor will lead to sampling failure, and the reliability of the sampling circuit is not high.
- the existing sampling circuit has the technical problems of low sampling accuracy and poor reliability.
- this application considers that by adding a controllable logic switch in the voltage sampling circuit, it can be switched on demand, closed when sampling is required, and opened when sampling is not needed. It can eliminate the useless power consumption of the resistance in the circuit during most of the time (no sampling time period), and a voltage sampling loop can be added at the same time, which can improve the accuracy and accuracy of the sampling voltage and the sampling circuit. Reliability.
- the battery pack voltage sampling circuit includes at least two voltage sampling loops, and each voltage sampling loop includes: the same battery pack, at least in parallel with the battery pack A resistor and at least one controllable logic switch,
- each voltage sampling loop includes a sampling resistor for voltage sampling; each controllable logic switch has a first state that disconnects all voltage sampling loops, and a second state that enables each voltage sampling loop to communicate independently.
- the battery pack in the above embodiment is a battery pack to be tested. At least two voltage sampling loops include the same battery pack to be tested.
- the loop also includes one or more resistors connected in parallel with the battery pack and a controllable logic switch.
- the first or second state possessed by each logic switch in the above example is an abstract statement.
- the second state in which each voltage sampling circuit is independently connected can be understood as: when the voltage sampling circuit includes two circuits , Each controllable logic switch in the two circuits has a second state, in this second state, the first voltage sampling circuit can be connected, the second voltage sampling circuit is disconnected; or the second voltage sampling circuit can be connected , The first voltage sampling loop is disconnected.
- the above-mentioned second state is a general term for multiple states of each controllable logic switch in each circuit.
- the second state may include a combination of multiple states, which can enable each voltage sampling circuit to independently communicate with each other. , Can be called the second state.
- the controllable logic switch is a switch that can receive logic control information, and can be turned on or off according to the received signal.
- the controllable logic switch includes a relay and/or a MOS tube, but it is not limited to the types listed above. It can also be other types of controllable logic switches.
- the controllable logic switch added to the voltage sampling circuit can be switched as needed.
- the voltage sampling circuits are closed respectively, and when the sampling is not needed, the voltage sampling circuit is opened.
- Such a control method It can eliminate the useless power consumption of the resistance in the circuit during most of the time (no sampling period), and at the same time add a voltage sampling loop, which can not only improve the accuracy and accuracy of the sampling voltage, but also improve the reliability of the sampling circuit. Sex.
- each voltage sampling loop includes:
- At least one controllable logic switch is arranged in series between the sampling resistor and other resistors in the multiple resistors.
- the voltage sampling circuit adopting this style has simpler setting and facilitates the calculation of the battery pack voltage.
- each voltage sampling loop may include the same sampling resistor, and the total resistance of each voltage sampling loop is different. This setting facilitates voltage sampling and facilitates subsequent calculations to calculate the average voltage of the battery pack.
- the above battery pack voltage sampling circuit includes two voltage sampling loops. Compared with the general setting of only one voltage sampling loop, the two voltage sampling loops can reduce the resistance in the elimination circuit. The useless power consumption generated during part of the time (no sampling period is required), and a voltage sampling loop is added. By controlling the switching signal, three voltage samplings can be completed within one switching cycle. After averaging the three sampling values, calculate The battery pack voltage can not only improve the accuracy and accuracy of the sampling voltage, but also improve the reliability of the sampling circuit, and is a practical setting method.
- these two voltage sampling loops may be referred to as a first voltage sampling loop and a second voltage sampling loop, where,
- the first voltage sampling loop includes a first resistance group and a ninth resistance arranged in series;
- the second voltage sampling loop includes a second resistance group and a ninth resistance arranged in series, wherein the ninth resistance is a sampling resistance, and the first resistance and the second resistance group respectively include a plurality of resistances arranged in series.
- the battery voltage sampling circuit includes two voltage sampling circuits, and the first voltage sampling circuit includes series settings The first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4 and the ninth resistor R9, wherein the first to fourth resistors (R1 ⁇ R4) constitute the first resistor group Ra; the first voltage The sampling loop includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth to fourth resistor R8 and a ninth resistor R9 arranged in series, wherein the fifth to eighth resistors (R5 to R8) constitute the second resistor Group Rb; the controllable logic switch in the first voltage sampling loop is set between the first resistance group and the ninth resistance, and the controllable logic switch in the second voltage sampling loop is set between the second resistance group and the ninth resistance ,
- the ninth resistor is the sampling resistor, and the voltage of the ninth resistor is the sampling
- the switch 1 and switch 2 are in the off state during the non-voltage sampling time, that is, the battery power consumption is reduced during the non-sampling time.
- the first stage is: the BMS triggers the logic control signal 1 to close the switch 1.
- the resistors R1, R2, R3, R4, R9 are connected in series and connected at both ends of the battery pack.
- the resistors R1, R2, R3, R4 The voltage on R9 is the voltage of the battery pack.
- the voltage on the RMS reading resistor R9 is U1
- the BMS triggers the logic control signal 1 to turn off the switch 1 to complete the first voltage sampling.
- the second stage is: BMS triggers logic control signal 2 to close switch 1.
- resistors R5, R6, R7, R8, and R9 are connected in series and connected to both ends of the battery pack.
- the voltage on R9 is the voltage of the battery pack.
- the voltage on the RMS reading resistor R9 is U2
- the BMS triggers the logic control signal 2 to turn off the switch 2 to complete the second voltage sampling.
- the voltage sampling can be completed three times within one switching cycle by controlling the switching signal, and the average value of the three sampling values is calculated to calculate the battery pack voltage.
- the circuit of the invention Compared with the original sampling circuit, the circuit of the invention has four resistors connected in parallel at the two ends of the original resistors R1, R2, R3 and R4, and two controllable logic switches are added at the same time.
- the useless power consumption caused by the resistance can be controlled by a logic switch to perform multiple voltage sampling and averaging, to improve the accuracy of voltage sampling, and at the same time, also enhance the reliability of the voltage sampling circuit.
- the present invention also provides a battery management system, which includes the battery pack voltage sampling circuit in the foregoing embodiment.
- controllable logic switch added to the voltage sampling circuit can be switched as needed, closed when sampling is required, and opened when sampling is not required.
- Such a control method can eliminate the resistance in the circuit. Most of the time (no need to sample the time period) generated unnecessary power consumption, while adding a voltage sampling loop, not only can improve the accuracy and accuracy of the sampling voltage, but also improve the reliability of the sampling circuit.
- the above battery management system further includes a controller including at least one of the following modules: a trigger module 10, a voltage sampling module 20, and a calculation module 30; wherein,
- Trigger module 10 set to trigger the state of the controllable logic switch
- the above-mentioned trigger module is used to send a logic control signal according to whether voltage sampling is currently needed to trigger the controllable logic switch in each loop to turn on or off; for example, when the voltage sampling loop does not need to sample, to each controllable logic
- the switch sends a logic control signal to control each logic controllable switch to be in the first state of disconnecting all voltage sampling loops.
- the voltage sampling loop When the voltage sampling loop needs to sample, it sends different logic control signals to each controllable logic switch to control each controllable logic
- the switch is in the second state where the voltage sampling circuits are independently connected; for example, when the first voltage collection circuit needs to sample, a logic control signal 1 is sent to the controllable logic switch in the first voltage collection circuit to make the controllable logic switch Closed, so that the loop is turned on, the collection voltage corresponding to the collection resistance can be collected to calculate the voltage of the battery pack, and after the sampling is completed, the above-mentioned controllable logic switch is triggered to open to complete the voltage sampling; similarly, it can also be When other voltage collection circuits need to be sampled, corresponding logic control signals are sent for corresponding control, which will not be repeated here.
- the voltage sampling module 20 is set to obtain the sampling voltage value of the sampling resistor
- the calculation module 30 is configured to calculate the voltage value of the battery pack.
- control of the voltage acquisition circuit is realized through various modules of different functions of the controller, which may be remote control, manual control, or control by a preset program, which makes the battery management system more intelligent.
- the present invention also provides a battery pack voltage sampling method, which includes:
- each voltage sampling circuit includes at least one resistor and at least one controllable logic switch connected in parallel with the battery pack;
- the battery pack voltage sampling method further includes:
- S103 Control to separately acquire the sampling voltage of the sampling resistor in each voltage sampling loop, where at least one resistor in each voltage sampling loop includes a sampling resistor;
- S104 Calculate the resistance of multiple battery packs based on the total resistance of all resistors in each voltage sampling loop, the resistance of each sampling resistor, and each sampled voltage;
- S105 Calculate the average resistance value of the battery pack according to the resistance values of the plurality of battery packs and the sampling times.
- control method in addition to eliminating unnecessary power consumption caused by resistance in the circuit, the control method can also perform multiple voltage sampling and averaging through control logic switches to improve the accuracy of voltage sampling. At the same time, It also enhances the reliability of the voltage sampling circuit.
- the battery pack voltage sampling circuit, method, and system provided in at least some embodiments of the present application have the following beneficial effects: the controllable logic switches added in the voltage sampling circuit can be switched as needed, and each of them is closed when sampling is required Voltage sampling circuit, disconnect the voltage sampling circuit when sampling is not needed, this control method can eliminate the useless power consumption generated by the resistance in the circuit for most of the time (no sampling time period), while adding a voltage sampling
- the loop can not only improve the accuracy and accuracy of the sampling voltage, but also the reliability of the sampling circuit, and solves the technical problem that the air conditioner cannot be automatically and accurately controlled effectively under the faults existing in the existing method.
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Abstract
一种电池组电压采样电路及方法、系统，其中，电池组电压采样电路包括至少两个电压采样回路，各所述电压采样回路中包括：同一电池组、与所述电池组并联的至少一个电阻、及至少一个可控逻辑开关，其中，各所述电压采样回路的电阻中包括用于电压采样的采样电阻；各所述可控逻辑开关具有断开所有所述电压采样回路的第一状态、和使各所述电压采样回路分别独立连通的第二状态。通过采用多个电压采样回路的连接方式，根据不同采样需要对电路中的可控逻辑开关进行控制，可以消除电路中因电阻而产生的无用功耗，同时通过控制可控逻辑开关来进行多次电压采样并求均值，能够提高电压采样的精度，增强电压采样电路的可靠性。
Description
本发明涉及电源管理系统技术领域，具体而言，涉及一种电池组电压采样电路及方法、系统。
电池组的电压采样是电池管理系统(BATTERY MANAGEMENT SYSTEM，简称BMS)中的比较重要的一部分，该电压是衡量剩余电量(State of Charge，简称SOC)的关键指标，在计算电池组的SOC的时候，需要每隔一段时间对电池组的电压进行采样；目前常用的电压采样回路(见附图1所示)是直接在电池组上并联电阻，通过电阻串联分压原理，得到电池组的电压。这种采样方式会有如下3个缺点：
1、电路中的电阻(R1、R2、R3、R4)阻值相对较大，但因为一直并联在电池组上，会产生一定的功率损失；
2、电阻自身阻值误差也会带来采样误差，采样精度相对较低；
3、电阻串联采样方式，任何一个电阻失效都会导致采样失效，采样电路的可靠性不高。
为了保证精确计算电池组的SOC，使电池组可靠、高效工作，需提高采样电路的采样精度，同时提高采样电路的可靠性。
发明内容
本发明至少部分实施例提供了一种电池组电压采样电路及方法、系统，以解决现有采样电路的采样精度低且可靠性差的技术问题。
在本发明其中一实施例中，提供了一种电池组电压采样电路，包括至少两个电压采样回路，各所述电压采样回路中包括：同一电池组、与所述电池组并联的至少一个电阻、及至少一个可控逻辑开关，其中，各所述电压采样回路的电阻中包括用于电压采样的采样电阻；各所述可控逻辑开关具有断开所有所述电压采样回路的第一状态、和使各所述电压采样回路分 别独立连通的第二状态。
在一个实施方式中，各所述电压采样回路中包括：多个电阻，相互串联，且与所述电池组并联；所述至少一个可控逻辑开关，串联设置于所述多个电阻中的采样电阻和其他电阻之间。
在一个实施方式中，每个所述电压采样回路中包括同一个所述采样电阻，且各所述电压采样回路的总阻值不同。
在一个实施方式中，所述电池组电压采样电路包括两个电压采样回路。
在一个实施方式中，两个所述电压采样回路包括第一电压采样回路和第二电压采样回路，其中，第一电压采样回路，包括串联设置的第一电阻组和第九电阻；第二电压采样回路，包括串联设置的第二电阻组和所述第九电阻，其中，所述第九电阻为所述采样电阻，所述第一电阻和第二电阻组分别包括多个串联设置的电阻。
在一个实施方式中，所述可控逻辑开关包括继电器和/或MOS管。
在本发明其中一实施例中，提供了一种电池管理系统，包括所述的电池组电压采样电路。
在一个实施方式中，还包括控制器，所述控制器包括如下模块中的至少一种：触发模块，设置为触发可控逻辑开关的状态；电压采样模块，设置为获取所述采样电阻的采样电压值；计算模块，设置为计算所述电池组的电压值。
在本发明其中一实施例中，提供了一种电池组电压采样方法，包括：设置至少两个电压采样回路，其中，各所述电压采样回路中包括与电池组并联的至少一个电阻和至少一个可控逻辑开关；当所述电压采样回路不需要采样时，控制各所述可控逻辑开关处于断开所有所述电压采样回路的第一状态，当所述电压采样回路需要采样时，控制各所述可控逻辑开关处于使所述电压采样回路分别独立连通的第二状态。
在一个实施方式中，在控制各所述可控逻辑开关处于使所述电压采样回路分别独立连通的第二状态之后，所述电池组电压采样方法还包括：控制分别获取各所述电压采样回路中的采样电阻的采样电压，其中，各所述电压采样回路中的至少一个电阻包括所述采样电阻；根据各所述电压采样 回路中的所有所述电阻的总阻值、各所述采样电阻的阻值、及各采样电压值，计算得到多个电池组的阻值；根据多个所述电池组的阻值和所述采样的次数，计算得到所述电池组的平均阻值。
在本发明至少部分实施例中，在电压采样电路中增加的可控逻辑开关可以按需切换，在需要采样的时候分别闭合各电压采样电路，在不需要采样的时候断开电压采样电路，这样的控制方式可以消除电路中的电阻在绝大部分时间里(无需采样时间段)产生的无用功耗，同时增加了一个电压采样回路，既可以提高采样电压的精度和准确性，也可以提高采样电路的可靠性。
构成本发明的一部分的附图用来提供对本发明的进一步理解，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是根据现有技术的一种常用电压采样回路的示意图；
图2是根据本发明实施例的一种逻辑可控的电池组电压采样电路的示意图。
为使本发明的目的、技术方案和优点更加清楚明白，下面结合实施方式和附图，对本发明做进一步详细说明。在此，本发明的示意性实施方式及其说明用于解释本发明，但并不作为对本发明的限定。
考虑到现有的电池组电压采样电路，图1是根据现有技术的一种常用电压采样回路的示意图，如图1所示，常用电压采样回路一般是通过电阻分压原理，计算出电池组的电压。如图1所示，该电池组电压采样电路包括串联的五个电阻，分别为电阻R1、电阻R2、电阻R3、电阻R4及电阻R5，如果采样电压为U，此时对应的采样电阻为R5，则电池组的电压Ubat＝U*(R1+R2+R3+R4+R5)/R5，其中，U为采样电压，即为电阻R5的电压值。
上述如图1这种目前常用的电压采样电路，主要通过直接在电池组上并联电阻，通过电阻串联分压原理，得到电池组的电压。这种采样方式会有如下3个缺点：1、电路中的电阻(R1、R2、R3、R4)阻值相对较大，但因为一直并联在电池组上，会产生一定的功率损失；2、电阻自身阻值误差也会带来的采样误差，采样精度相对较低；3、电阻串联采样方式，任何一个电阻失效都会导致采样失效，采样电路的可靠性不高。综上，现有采样电路存在采样精度低且可靠性差的技术问题。
针对产生上述技术问题的根本原因，本申请考虑可以通过在电压采样电路中增加可控逻辑开关，可以按需切换，在需要采样的时候闭合，在不需要采样的时候断开，这样的控制方式可以消除电路中的电阻在绝大部分时间里(无需采样时间段)产生的无用功耗，还可以同时增加了一个电压采样回路，既可以提高采样电压的精度和准确性，也可以提高采样电路的可靠性。
基于上述思考思路，本申请实施方式提供了一种电池组电压采样电路，该电池组电压采样电路包括至少两个电压采样回路，各电压采样回路中包括：同一电池组、与电池组并联的至少一个电阻、及至少一个可控逻辑开关，
其中，各电压采样回路的电阻中包括用于电压采样的采样电阻；各可控逻辑开关具有断开所有电压采样回路的第一状态、和使各电压采样回路分别独立连通的第二状态。
上述实施例中的电池组为待测电池组，至少两个电压采样回路中都包括同一待测的电池组，该回路还包括与电池组并联的一个或多个电阻，和可控逻辑开关。
上述实例中的各逻辑开关具有的第一或第二状态为一种抽象的说法，比如，使各电压采样回路分别独立连通的第二状态，可以理解为：当电压采样回路包括两个回路时，两个回路中的各可控逻辑开关具有第二状态，在该第二状态下，能够使第一个电压采样回路连通，第二电压采样回路断开；或者使第二个电压采样回路连通，第一电压采样回路断开。上述的第二状态是各回路中的各可控逻辑开关的多种状态的统称，该第二状态可以包括多个状态的组合，能够使各电压采样回路分别独立连通的可控逻辑开 关的状态，都可以称为第二状态。
上述可控逻辑开关为可以接收逻辑控制信息的开关，能够根据接收到的信号来进行开启或关闭，优选上述可控逻辑开关包括继电器和/或MOS管，但不限于上述列举出的几种，还可以是其他类型的可控逻辑开关。
在上述实施例中，在电压采样电路中增加的可控逻辑开关可以按需切换，在需要采样的时候分别闭合各电压采样电路，在不需要采样的时候断开电压采样电路，这样的控制方式可以消除电路中的电阻在绝大部分时间里(无需采样时间段)产生的无用功耗，同时增加了一个电压采样回路，既可以提高采样电压的精度和准确性，也可以提高采样电路的可靠性。
在一个可选的实施例中，各电压采样回路中包括：
多个电阻，相互串联，且与电池组并联；
至少一个可控逻辑开关，串联设置于多个电阻中的采样电阻和其他电阻之间。
通过上述实施例，采用这种样式的电压采样回路，设置更加简单，并且便于电池组电压的计算。
上述实施例中，每个电压采样回路中可以包括同一个采样电阻，且各电压采样回路的总阻值不同，这样设置方便电压采样，并且方便后续多次采样求电池组的平均电压的计算。
上述电压采样电路可以为多个，具体可以根据实际采样条件和采样需求来设置电压采样电路的个数。在一个可选的实施例中，上述电池组电压采样电路包括两个电压采样回路，两个电压采样回路较一般的仅设置一条电压采样回路来说，可以实现减少消除电路中的电阻在绝大部分时间里(无需采样时间段)产生的无用功耗，同时增加了一个电压采样回路，通过控制开关信号可以一个开关周期内完成3次电压采样，求取3次采样值的平均值后，计算电池组电压，既可以提高采样电压的精度和准确性，也可以提高采样电路的可靠性，是实用性较高的一种设置方法。
当采用两个电压采样回路时，这两个电压采样回路可以称为第一电压采样回路和第二电压采样回路，其中，
第一电压采样回路，包括串联设置的第一电阻组和第九电阻；
第二电压采样回路，包括串联设置的第二电阻组和第九电阻，其中， 第九电阻为采样电阻，第一电阻和第二电阻组分别包括多个串联设置的电阻。
图2是根据本发明实施例的一种逻辑可控的电池组电压采样电路的示意图，如图2所示，该电池组电压采样电路包括两条电压采样回路，第一电压采样回路包括串联设置的第一电阻R1、第二电阻R2、第三电阻R3、第四电阻R4和第九电阻R9，其中，第一至第四电阻(R1～R4)组成上述第一电阻组Ra；第一电压采样回路包括串联设置的第五电阻R5、第六电阻R6、第七电阻R7、第八四电阻R8和第九电阻R9，其中，第五至第八电阻(R5～R8)组成上述第二电阻组Rb；第一电压采样回路中的可控逻辑开关设置在第一电阻组和第九电阻之间，第二电压采样回路中的可控逻辑开关设置在第二电阻组和第九电阻之间，第九电阻为采样电阻，第九电阻的电压为采样电压。
本发明上述电池组电压采样的可控逻辑电路的工作过程如下：
电池管理系统(BMS)在非电压采样时间内，开关1和开关2处于断开状态，即在非采样时间内减少电池功耗。
当需要电压采样时，分四个阶段来进行：
第一个阶段为：BMS触发逻辑控制信号1使开关1闭合，开关1闭合后，电阻R1、R2、R3、R4、R9串联后并联接在电池组两端，电阻R1、R2、R3、R4、R9上的电压和即为电池组的电压，此时BMS读取电阻R9上的电压为U1，反向计算可得电池组的电压为Ubat1＝U1*(R1+R2+R3+R4+R9)/R9，完成R9上的电压采样后，BMS触发逻辑控制信号1使开关1断开，完成第一次电压采样。
第二个阶段为：BMS触发逻辑控制信号2使开关1闭合，开关2闭合后，电阻R5、R6、R7、R8、R9串联后并联接在电池组两端，电阻R5、R6、R7、R8、R9上的电压和即为电池组的电压，此时BMS读取电阻R9上的电压为U2，反向计算可得电池组的电压为Ubat2＝U2*(R5+R6+R7+R8+R9)/R9，完成R9上的电压采样后，BMS触发逻辑控制信号2使开关2断开，完成第二次电压采样。
第三个阶段为：BMS分别触发逻辑控制信号1、逻辑控制信号2使开关1、开关2闭合后，BMS读取电阻R9上的电压为U3，反向计算可得电 池组的电压为Ubat3＝U3+U3*Ra*Rb/(R9*(Ra+Rb))，(式中，Ra＝R1+R2+R3+R4，Rb＝R5+R6+R7+R8)，完成R9上的电压采样后，BMS分别触发逻辑控制信号1、逻辑控制信号2使开关1、开关2断开，完成第三次电压采样。
第四个阶段为：将得到三个采样电压Ubat1、Ubat2、Ubat3取平均值后，得到最终的电池组电压，即Ubat＝(Ubat1+Ubat2+Ubat3)/3。
采用本发明的上述实施例中的电池组电压采样电路，通过控制开关信号可以一个开关周期内完成3次电压采样，求取3次采样值的平均值后，计算电池组电压。
本发明电路对比于原来的采样电路，在原有的电阻R1、R2、R3、R4两端并联四个电阻，同时增加了两个可控的逻辑开关，这样的连接方式一方面可以消除电路中因电阻而产生的无用功耗，另一方面可以通过控制逻辑开关来进行多次电压采样并求均值，提高电压采样的精度，与此同时，也增强了电压采样电路的可靠性。
基于同样的思路，本发明还提出了一种电池管理系统，其包括上述实施例中的电池组电压采样电路。
采用这种电池管理系统，在电压采样电路中增加的可控逻辑开关可以按需切换，在需要采样的时候闭合，在不需要采样的时候断开，这样的控制方式可以消除电路中的电阻在绝大部分时间里(无需采样时间段)产生的无用功耗，同时增加了一个电压采样回路，既可以提高采样电压的精度和准确性，也可以提高采样电路的可靠性。
在一个可选的实施例中，上述电池管理系统还包括控制器，该控制器包括如下模块中的至少一种：触发模块10、电压采样模块20和计算模块30；其中，
触发模块10，设置为触发可控逻辑开关的状态；
上述的触发模块用于根据当前是否需要电压采样的情况，来发送逻辑控制信号，触发各回路中的可控逻辑开关开启或关闭；比如，当电压采样回路不需要采样时，向各可控逻辑开关发送逻辑控制信号，控制各逻辑可控开关处于断开所有电压采样回路的第一状态，当电压采样回路需要采样时，向各可控逻辑开关发送不同的逻辑控制信号，控制各可控逻辑开关处 于使电压采样回路分别独立连通的第二状态；例如，当第一电压采集回路需要采样时，向第一电压采集回路中的可控逻辑开关发送逻辑控制信号1，使该可控逻辑开关闭合，从而该回路导通，能够采集到采集电阻对应的采集电压，从而计算出电池组的电压，并且在采样结束后，触发上述可控逻辑开关断开，完成电压采样；同样，还可以在其他电压采集回路需要采样时，发送对应的逻辑控制信号进行相应的控制，在此不再赘述。
电压采样模块20，设置为获取采样电阻的采样电压值；
计算模块30，设置为计算电池组的电压值。
上述实施例，通过控制器的各种不同功能的模块来实现对电压采集电路的控制，可以是远程控制、人工控制、或者通过预设的程序对其进行控制，使得该电池管理系统更加智能。
基于相同的思路，本发明还提供了一种电池组电压采样方法，该方法包括：
S101，设置至少两个电压采样回路，其中，各电压采样回路中包括与电池组并联的至少一个电阻和至少一个可控逻辑开关；
S102a，当电压采样回路不需要采样时，控制各可控逻辑开关处于断开所有电压采样回路的第一状态，
S102b，当电压采样回路需要采样时，控制各可控逻辑开关处于使电压采样电路分别独立连通的第二状态。
通过上述控制方法，采用多个电压采样回路的连接方式，并根据不同采用需要对电路中的可控逻辑开关进行控制，可以消除电路中因电阻而产生的无用功耗。
上述步骤S102b，在控制各可控逻辑开关处于使电压采样回路分别独立连通的第二状态之后，电池组电压采样方法还包括：
S103，控制分别获取各电压采样回路中的采样电阻的采样电压，其中，各电压采样回路中的至少一个电阻包括采样电阻；
S104，根据各电压采样回路中的所有电阻的总阻值、各采样电阻的阻值、及各采样电压值，计算得到多个电池组的阻值；
S105，根据多个电池组的阻值和采样的次数，计算得到电池组的平均阻值。
通过上述实施例，该控制方法除了可以消除电路中因电阻而产生的无用功耗之外，还可以通过控制逻辑开关来进行多次电压采样并求均值，提高电压采样的精度，与此同时，也增强了电压采样电路的可靠性。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，对于本领域的技术人员来说，本发明实施例可以有各种更改和变化。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。
如上所述，本申请至少部分实施例提供的电池组电压采样电路及方法、系统具有以下有益效果：在电压采样电路中增加的可控逻辑开关可以按需切换，在需要采样的时候分别闭合各电压采样电路，在不需要采样的时候断开电压采样电路，这样的控制方式可以消除电路中的电阻在绝大部分时间里(无需采样时间段)产生的无用功耗，同时增加了一个电压采样回路，既可以提高采样电压的精度和准确性，也可以提高采样电路的可靠性，解决了现有方法中存在的故障情况下无法自动、准确地对空调进行相应的有效控制的技术问题。
Claims (10)
- 一种电池组电压采样电路，包括至少两个电压采样回路，各所述电压采样回路中包括：同一电池组、与所述电池组并联的至少一个电阻、及至少一个可控逻辑开关，其中，各所述电压采样回路的电阻中包括用于电压采样的采样电阻；各所述可控逻辑开关具有断开所有所述电压采样回路的第一状态、和使各所述电压采样回路分别独立连通的第二状态。
- 根据权利要求1所述的电池组电压采样电路，其中，各所述电压采样回路中包括：多个电阻，相互串联，且与所述电池组并联；所述至少一个可控逻辑开关，串联设置于所述多个电阻中的采样电阻和其他电阻之间。
- 根据权利要求2所述的电池组电压采样电路，其中，每个所述电压采样回路中包括同一个所述采样电阻，且各所述电压采样回路的总阻值不同。
- 根据权利要求1至3中任一项所述的电池组电压采样电路，其中，所述电池组电压采样电路包括两个电压采样回路。
- 根据权利要求4所述的电池组电压采样电路，其中，两个所述电压采样回路包括第一电压采样回路和第二电压采样回路，其中，第一电压采样回路，包括串联设置的第一电阻组和第九电阻；第二电压采样回路，包括串联设置的第二电阻组和所述第九电阻，其中，所述第九电阻为所述采样电阻，所述第一电阻和第二电阻组分别包括多个串联设置的电阻。
- 根据权利要求1所述的电池组电压采样电路，其中，所述可控逻辑开关包括继电器和/或MOS管。
- 一种电池管理系统，其中，包括如权利要求1所述的电池组电压采样电路。
- 根据权利要求7所述的电池管理系统，其中，还包括控制器，所述控制器包括如下模块中的至少一种：触发模块，设置为触发可控逻辑开关的状态；电压采样模块，设置为获取采样电阻的采样电压值；计算模块，设置为计算电池组的电压值。
- 一种电池组电压采样方法，包括：设置至少两个电压采样回路，其中，各所述电压采样回路中包括与电池组并联的至少一个电阻和至少一个可控逻辑开关；当所述电压采样回路不需要采样时，控制各所述可控逻辑开关处于断开所有所述电压采样回路的第一状态，当所述电压采样回路需要采样时，控制各所述可控逻辑开关处于使所述电压采样回路分别独立连通的第二状态。
- 根据权利要求9所述的电池组电压采样方法，在控制各所述可控逻辑开关处于使所述电压采样回路分别独立连通的第二状态之后，所述电池组电压采样方法还包括：控制分别获取各所述电压采样回路中的采样电阻的采样电压，其中，各所述电压采样回路中的至少一个电阻包括所述采样电阻；根据各所述电压采样回路中的所有所述电阻的总阻值、各所述采样电阻的阻值、及各采样电压值，计算得到多个电池组的阻值；根据多个所述电池组的阻值和采样的次数，计算得到所述电池组的平均阻值。
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| CN109507602A (zh) * | 2018-11-27 | 2019-03-22 | 珠海格力电器股份有限公司 | 电池组电压采样电路及方法、系统 |
| CN112730970B (zh) * | 2020-12-18 | 2023-07-18 | 扬州大学 | 一种隔离式高精度宽范围电压测量系统及测量方法 |
| CN113865001A (zh) * | 2021-10-26 | 2021-12-31 | 珠海格力电器股份有限公司 | 空调机组控制方法、控制装置及空调机组 |
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| JP2000131348A (ja) * | 1998-10-28 | 2000-05-12 | New Japan Radio Co Ltd | ディジタル測定装置 |
| CN102243260A (zh) * | 2010-05-10 | 2011-11-16 | 东莞市创锐电子技术有限公司 | 一种用于高精度高线性度的交直流电流检测装置 |
| CN102798761A (zh) * | 2012-08-31 | 2012-11-28 | 阳光电源股份有限公司 | 一种对地绝缘阻抗检测方法、电路及具有该电路的设备 |
| CN108627688A (zh) * | 2018-08-03 | 2018-10-09 | 长春七角星科技发展有限公司 | 一种电动车高压母线监测装置及监测方法 |
| CN109507602A (zh) * | 2018-11-27 | 2019-03-22 | 珠海格力电器股份有限公司 | 电池组电压采样电路及方法、系统 |
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- 2018-11-27 CN CN201811429045.5A patent/CN109507602A/zh active Pending
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| JP2000131348A (ja) * | 1998-10-28 | 2000-05-12 | New Japan Radio Co Ltd | ディジタル測定装置 |
| CN102243260A (zh) * | 2010-05-10 | 2011-11-16 | 东莞市创锐电子技术有限公司 | 一种用于高精度高线性度的交直流电流检测装置 |
| CN102798761A (zh) * | 2012-08-31 | 2012-11-28 | 阳光电源股份有限公司 | 一种对地绝缘阻抗检测方法、电路及具有该电路的设备 |
| CN108627688A (zh) * | 2018-08-03 | 2018-10-09 | 长春七角星科技发展有限公司 | 一种电动车高压母线监测装置及监测方法 |
| CN109507602A (zh) * | 2018-11-27 | 2019-03-22 | 珠海格力电器股份有限公司 | 电池组电压采样电路及方法、系统 |
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| CN117665427A (zh) * | 2022-08-30 | 2024-03-08 | 锐石创芯(深圳)科技股份有限公司 | 一种校验模块和校验盒 |
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