WO2022082529A1 - 继电器粘连检测方法及系统 - Google Patents
继电器粘连检测方法及系统 Download PDFInfo
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- WO2022082529A1 WO2022082529A1 PCT/CN2020/122589 CN2020122589W WO2022082529A1 WO 2022082529 A1 WO2022082529 A1 WO 2022082529A1 CN 2020122589 W CN2020122589 W CN 2020122589W WO 2022082529 A1 WO2022082529 A1 WO 2022082529A1
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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
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
- G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches
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- the present application relates to the technical field of new energy electronics, in particular to a relay adhesion detection system applied to a fast charging circuit of an electric vehicle and similar electrical circuits.
- the battery system is the power source of new energy vehicles, and zero emission during driving is its greatest advantage, so it has received strong support from the state.
- FIG. 1 is a schematic diagram of an existing fast charging circuit.
- the fast charging circuit includes a rechargeable battery U, a fast charging port and relays K1 and K2 .
- the current flowing through the relay is relatively large, and there is a risk of sticking. In order to avoid this unexpected closing, the relay needs to be tested to determine whether it is sticking.
- FIG. 2 is a schematic structural diagram of an existing relay adhesion detection circuit.
- the relay adhesion detection circuit includes a rechargeable battery U, resistors R1 to R8, relays K1 and K2 and a fast charging port.
- embodiments of the present application provide a relay adhesion detection method and system, so as to simplify the relay adhesion detection process and improve the safety performance of the detection circuit.
- an embodiment of the present application provides a relay adhesion detection system, including a fast charging port, a rechargeable battery, a first relay and a second relay, the first relay being connected to the fast charging port and the rechargeable battery
- the second relay is connected between the fast charging port and the negative electrode of the rechargeable battery
- the detection system further includes a detection circuit and a standard voltage circuit:
- the first end of the detection circuit is connected to one end of the first relay and the positive pole of the rechargeable battery
- the second end of the detection circuit is connected to the other end of the first relay
- the first end of the detection circuit is connected to the other end of the first relay.
- the three terminals are connected to one end of the second relay and the negative terminal of the rechargeable battery
- the fourth terminal of the detection circuit is connected to the other terminal of the second relay
- one terminal of the standard voltage circuit is connected to the positive terminal of the rechargeable battery connected, and the other end is connected to the negative electrode of the rechargeable battery;
- the first relay and/or the The second relay is in a corresponding state, wherein the corresponding state includes a normal state and a stuck state.
- the standard voltage circuit includes a first resistor and a second resistor; one end of the first resistor is connected to the positive electrode of the rechargeable battery, and the other end of the first resistor is connected to one end of the second resistor, The other end of the second resistor is connected to the negative electrode of the rechargeable battery.
- the detection circuit includes a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor:
- One end of the third resistor is connected to the positive electrode of the rechargeable battery and one end of the first relay, the other end of the third resistor is connected to one end of the fourth resistor, and the other end of the fourth resistor is connected to The negative pole of the rechargeable battery is connected to one end of the second relay;
- One end of the fifth resistor is connected to the other end of the first relay, the other end of the fifth resistor is connected to one end of the sixth resistor, and the other end of the sixth resistor is connected to the other end of the second relay connect.
- the detection circuit further includes a detection switch, one end of the detection switch is connected between the third resistor and the fourth resistor, and the other end is connected between the fifth resistor and the sixth resistor .
- the relay adhesion detection system further includes: a first voltage detector and a second voltage detector; wherein the first voltage detector is connected in parallel with the second resistor, and the second voltage detector is connected in parallel with the fourth resistor.
- the voltage value of the first voltage detector is the first voltage
- the voltage value of the second voltage detector is the second voltage.
- an embodiment of the present application provides a method for detecting adhesion of a relay, which is applied to the system for detecting adhesion of a relay provided by an embodiment of the present application.
- the method includes: acquiring a first voltage Ua; acquiring a second voltage Ub; calculating a difference between the first voltage Ua and the second voltage Ub; judging the first relay and the second relay according to the difference
- the corresponding state of the relay, the corresponding state includes a normal state and a stuck state.
- both the first relay and the second relay are normal; at this time:
- U is the voltage value of the rechargeable battery
- R1 is the resistance value of the first resistor
- R2 is the resistance value of the second resistor
- R3 is the resistance value of the third resistor
- R4 is the resistance value of the fourth resistor.
- both the first relay and the second relay are stuck; at this time:
- R5 is the resistance value of the fifth resistor
- R6 is the resistance value of the sixth resistor
- R7 is the resistance value of the third resistor and the fifth resistor in parallel
- R8 is the resistance value of the fourth resistor and the sixth resistor in parallel
- R7 R3*R5/(R3+R5)
- R8 R4*R6/(R4+R6).
- the embodiment of the present application utilizes the relay adhesion detection system provided, and a detection circuit is set in the relay adhesion detection system to perform fault detection on different relays; specifically, a first voltage detector is set in parallel with a second resistor, and a second voltage is set in parallel. The detector is connected in parallel with the fourth resistor; by adjusting the opening and closing of the detection switch, the voltage values of the first voltage Ua and the second voltage Ub are obtained, and the difference between the Ua and the Ub is calculated, according to the difference The value is used to judge whether the relay has a state of adhesion, and then judge the corresponding state of the first relay and the second relay.
- the relay adhesion detection system provided by the embodiment of the present application only needs to detect two voltages, and the relay adhesion detection can be completed through a small number of circuit elements.
- the introduction of the detection switch solves the safety regulation problem of the fast charging port being charged, and the resistance value of the detection resistor can be set to a relatively small value, which is beneficial to improve the anti-interference ability and is more practical.
- FIG. 1 is a schematic structural diagram of an existing fast charging circuit
- FIG. 2 is a schematic structural diagram of an existing relay adhesion detection circuit
- FIG. 3 is a schematic structural diagram of a relay adhesion detection system provided by an embodiment of the present application.
- Fig. 4 is the structural representation that a kind of relay adhesion detection system provided in Fig. 3 is further realized;
- FIG. 5 is a schematic flowchart of a relay adhesion detection method provided by an embodiment of the present application.
- FIG. 3 is a schematic structural diagram of a relay adhesion detection system provided by an embodiment of the present application.
- the relay adhesion detection system 100 includes a rechargeable battery 110 , a fast charging port 120 , a first relay 130 , a second relay 140 , a standard voltage circuit 150 and a detection circuit 160 .
- One end of the standard voltage circuit 150 is connected to the positive electrode of the rechargeable battery 110 , and the other end of the standard voltage circuit 150 is connected to the negative electrode of the rechargeable battery 110 .
- the first end of the detection circuit 160 is connected to the end of the first relay 130 connected to the rechargeable battery, and the second end of the detection circuit 160 is connected to the end of the first relay 130 connected to the fast charging port.
- the third end of the circuit 160 is connected to the end of the second relay 140 connected to the rechargeable battery, and the fourth end of the detection circuit 160 is connected to the end of the second relay 140 connected to the fast charging port.
- the standard voltage circuit 150 includes a first voltage detector
- the detection circuit 160 includes a second voltage detector and a detection switch.
- the first voltage in the standard voltage circuit 150 is a constant value, and the difference between the second voltage in the detection circuit 160 and the first voltage is a different value, corresponding to the first relay and/or Or the second relay is in a corresponding state, wherein the corresponding state includes a normal state and a stuck state.
- the first voltage is the voltage reading of the first voltage detector
- the second voltage is the voltage reading of the second voltage detector
- the relay adhesion detection system provided by the embodiment of the present application, only two voltages are needed to be detected, and the relay adhesion detection can be completed with a small number of circuit elements.
- the introduction of the detection switch solves the safety regulation problem of the fast charging port being charged, and the resistance value of the detection resistor can be set to be relatively small, which is beneficial to improve the anti-interference ability.
- FIG. 4 is a schematic structural diagram of a further implementation of the relay adhesion detection system provided in FIG. 3 .
- the relay adhesion detection system 100 includes a fast charging port, a rechargeable battery U, a first relay K1 and a second relay K2, the K1 is connected between the fast charging port and the positive electrode of the rechargeable battery U, and the K2 is connected between the rechargeable battery U. between the fast charging port and the negative electrode of the rechargeable battery U.
- the relay adhesion detection system 100 further includes a standard voltage circuit 150 and a detection circuit 160:
- the first end of the detection circuit 160 is connected to one end of the first relay K1 and the positive electrode of the rechargeable battery U, and the second end of the detection circuit 160 is connected to the other end of the first relay K1.
- the third end of the circuit is connected to one end of the second relay K2 and the negative electrode of the rechargeable battery U, and the fourth end of the detection circuit 160 is connected to the other end of the second relay K2;
- the standard voltage circuit One end of 150 is connected to the positive pole of the rechargeable battery U, and the other end is connected to the negative pole of the rechargeable battery U; when the first voltage in the standard voltage circuit 150 is a constant value, and the second voltage in the detection circuit 160 is the same as the When the difference between the first voltages is different, the first relay K1 and/or the second relay K2 are in corresponding states, wherein the corresponding states include a normal state and a stuck state.
- the standard voltage circuit 150 includes a first resistor R1 and a second resistor R2; one end of the first resistor R1 is connected to the positive electrode of the rechargeable battery U, and the other end of the first resistor R1 is connected to the first resistor R1. One end of the second resistor R2 is connected, and the other end of the second resistor R2 is connected to the negative electrode of the rechargeable battery U.
- the detection circuit 160 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6:
- One end of the third resistor R3 is connected to the positive electrode of the rechargeable battery U and one end of the first relay, the other end of the third resistor R3 is connected to one end of the fourth resistor R4, and the fourth resistor The other end of R4 is connected to the negative electrode of the rechargeable battery U and one end of the second relay K2;
- One end of the fifth resistor R5 is connected to the other end of the first relay K1, the other end of the fifth resistor R5 is connected to one end of the sixth resistor R6, and the other end of the sixth resistor R6 is connected to the first The other end of the second relay K2 is connected.
- the detection circuit 160 further includes: a detection switch K3, one end of the detection switch K3 is connected between the third resistor R3 and the fourth resistor R4, and the other end is connected between the fifth resistor R5 and the fourth resistor R4 between the sixth resistor R6.
- the relay adhesion detection system 100 further comprises: a first voltage detector Ua and a second voltage detector Ub; wherein, the first voltage detector Ua is connected in parallel with the second resistor R2, and the second voltage detector Ub is connected with the first voltage detector Ub in parallel with the second resistor R2.
- Four resistors R4 are connected in parallel.
- the states of the first relay K1 and the second relay K2 may include the following four situations:
- the current signal is passed through the standard voltage circuit 150 composed of the first resistor R1 and the second resistor R2 and the detection circuit 160 by the positive electrode of the rechargeable battery U in turn.
- the third resistor R3 and the fourth resistor R4 then return to the negative electrode of the rechargeable battery U.
- the current signal is passed through the standard voltage circuit 150 composed of the first resistor K1 and the second resistor K2 and the third resistor R3,
- the detection circuit 160 composed of the fourth resistor R4, the fifth resistor R5, the sixth resistor R6 and the detection switch K3 returns to the negative electrode of the rechargeable battery U.
- the current signal is passed by the positive pole of the rechargeable battery U through the standard voltage circuit 150 and the detection circuit 160 composed of the first resistor R1 and the second resistor R2 in turn.
- the parallel branch formed by the third resistor R3 and the fourth resistor R4 and the sixth resistor R6 of the detection circuit 160 returns to the negative electrode of the rechargeable battery U.
- the current signal is passed by the positive pole of the rechargeable battery U through the standard voltage circuit 150 and the detection circuit 160 composed of the first resistor R1 and the second resistor R2 in turn.
- the parallel branch formed by the third resistor R3 and the fifth resistor R5 and the fourth resistor R4 of the detection circuit 160 return to the negative electrode of the rechargeable battery U.
- FIG. 5 is a schematic flowchart of a relay adhesion detection method provided by an embodiment of the present application. This method is applied to the relay adhesion detection system provided in the embodiment of the present application, and may include but not limited to the following steps:
- judging the corresponding states of the first relay and the second relay according to the difference value includes the following four situations:
- both the first relay and the second relay are normal, at this time:
- U is the voltage value of the rechargeable battery
- R1 is the resistance value of the first resistor
- R2 is the resistance value of the second resistor
- R3 is the resistance value of the third resistor
- R4 is the resistance value of the fourth resistor.
- R5 is the resistance value of the fifth resistor
- R6 is the resistance value of the sixth resistor
- R7 is the resistance value of the third resistor and the fifth resistor in parallel
- R8 is the resistance value of the fourth resistor and the sixth resistor in parallel
- R7 R3*R5/(R3+R5)
- R8 R4*R6/(R4+R6).
- the battery system of an electric vehicle generally performs relay adhesion detection before the vehicle is powered on or charged.
- the embodiment of the present application utilizes the relay adhesion detection system provided, and a detection circuit is set in the relay adhesion detection system to perform fault detection on different relays; specifically, a first voltage detector is set in parallel with a second resistor, and a second voltage is set in parallel. The detector is connected in parallel with the fourth resistor; by regulating the opening and closing of the detection switch K3, the voltage values of the first voltage Ua and the second voltage Ub are obtained, and the difference between the Ua and the Ub is calculated, according to the The difference value judges whether the relay has a state of adhesion, and then judges the corresponding state of the first relay and the second relay.
- the relay adhesion detection system provided by the embodiment of the present application only needs to detect two voltages, and the relay adhesion detection can be completed by a small number of circuit elements.
- the introduction of the detection switch K3 solves the safety regulation problem of the fast charging port being charged, and the resistance value of the detection resistor can be set to a relatively small value, which is beneficial to improve the anti-interference ability and is more practical.
- the relay adhesion detection system provided by the embodiment of the present application, only two voltages are needed to be detected, and the relay adhesion detection can be completed with a small number of circuit elements.
- the introduction of the detection switch K3 solves the safety regulation problem of the fast charging port being charged, and the resistance value of the detection resistor can be set to be relatively small, which is conducive to improving the anti-interference ability.
Abstract
一种继电器粘连检测方法及系统，所述继电器粘连检测系统包括快充口（120），充电电池（110）以及分别连接在所述快充口（120）和所述充电电池（110）的正极之间的第一继电器（130）、连接在所述快充口（120）和所述充电电池（110）的负极之间的第二继电器（140），还包括连接在所述充电电池（150）的正极与负极两端的标准电压电路（150）；连接在所述第一继电器（130）和所述第二继电器（140）之间的检测电路（160）。该继电器粘连检测系统，只需检测两个电压，通过少量的电路元件即可完成继电器粘连检测。且检测开关的引入解决了快充口带电的安规问题，检测电阻阻值可以设置的比较小，利于提高抗干扰能力。
Description
本申请涉及新能源电子技术领域，特别是涉及一种应用于电动汽车快充回路及类似电气回路的继电器粘连检测系统。
目前，我国新能源汽车行业迅猛发展，电池系统是新能源汽车的动力来源，行驶过程中零排放是其最大优点，因此得到了国家的大力扶持。
然而，由于新能源汽车充电造成的安全事故层出不穷，新能源汽车安全方面的问题受到了越来越多的关注。在电动车快充回路上，为了在异常工况及不进行充电时，切断快充口与动力电池的连接，需要增加继电器。如图1所示，图1是现有的一种快充回路的示意图，该快充回路包括充电电池U，快充口和继电器K1、K2。而继电器上流过的电流比较大，存在粘连的风险，为了避免这种非预期的闭合，需对继电器进行检测，判断其是否粘连。如图2所示，图2是现有的一种继电器粘连检测电路的结构示意图，该继电器粘连检测电路包括充电电池U，电阻R1～R8，继电器K1、K2以及快充口。其中R1＝R4＝R3,R2＝R7＝R6，当继电器K1、K2未粘连时，即K1，K2断开，显然Va＝Vb＝Vc；当继电器K1粘连时，即K1非预期闭合，R3与R5并联，显然此时Vc>Va；当继电器K2粘连时，即K2非预期闭合，R7与R8并联，显然此时Vb<Va。故通过比较三个电压值即可判断两个继电器是否粘连。
但是该电路存在两个问题，一是需检测三个电压值，相对较复杂；二是检测电阻将动力电池的高压电引入到了充电口，为了满足安规，检测电阻需使用大于20M欧姆的安规电阻，成本较高，且过大的阻值会导致检测电路抗干扰能力下降。
发明内容
有鉴于此，本申请实施例提供了一种继电器粘连检测方法与系统，以简化继电器粘连检测的过程，提高检测电路的安全性能。
第一方面，本申请实施例提供了一种继电器粘连检测系统，包括快充口、充电电池、第一继电器和第二继电器，所述第一继电器连接在所述快充口和所 述充电电池的正极之间，所述第二继电器连接在所述快充口和所述充电电池的负极之间，所述检测系统还包括检测电路和标准电压电路：
所述检测电路的第一端与所述第一继电器的一端以及所述充电电池的正极连接，所述检测电路的第二端与所述第一继电器的另一端连接，所述检测电路的第三端与所述第二继电器的一端以及所述充电电池的负极连接，所述检测电路的第四端与所述第二继电器的另一端连接；所述标准电压电路一端与所述充电电池正极连接，另一端与所述充电电池负极连接；
当所述标准电压电路中的第一电压为定值，且所述检测电路中的第二电压与所述第一电压的差值为不同的值时，所述第一继电器和/或所述第二继电器处于对应状态，其中，所述对应状态包括正常状态和粘连状态。
进一步地，所述标准电压电路包括第一电阻和第二电阻；所述第一电阻一端与所述充电电池的正极连接，所述第一电阻的另一端与所述第二电阻的一端连接，所述第二电阻的另一端与所述充电电池的负极连接。
进一步地，所述检测电路包括第三电阻、第四电阻、第五电阻、第六电阻：
所述第三电阻一端与所述充电电池的正极以及所述第一继电器的一端连接，所述第三电阻的另一端与所述第四电阻的一端连接，所述第四电阻的另一端与所述充电电池的负极以及所述第二继电器的一端连接；
所述第五电阻一端与第一继电器的另一端连接，所述第五电阻的另一端与所述第六电阻的一端连接，所述第六电阻的另一端与所述第二继电器的另一端连接。
进一步地，所述检测电路还包括检测开关，所述检测开关一端连接在所述第三电阻与所述第四电阻之间，另一端连接在所述第五电阻与所述第六电阻之间。
进一步地，所述继电器粘连检测系统还包括：第一电压检测器和第二电压检测器；其中，第一电压检测器与第二电阻并联，第二电压检测器与第四电阻并联。所述第一电压检测器的电压值为第一电压，所述第二电压检测器的电压值为第二电压。
第二方面，本申请实施例提供了一种继电器粘连检测方法，应用于本申请实施例提供的继电器粘连检测系统。该方法包括：获取第一电压Ua；获取第二电压Ub；计算所述第一电压Ua和所述第二电压Ub的差值；根据所述差值 判断所述第一继电器和所述第二继电器的对应状态，所述对应状态包括正常状态和粘连状态。
进一步地，当所述差值等于第一阈值时，所述第一继电器和所述第二继电器均正常；此时：
Ua＝U*R2/(R1+R2)；
Ub＝U*R4/(R3+R4)。
其中，U为充电电池的电压值，R1为第一电阻的阻值，R2为第二电阻的阻值，R3为第三电阻的阻值，R4为第四电阻的阻值。
进一步地，当所述差值等于第二阈值时，所述第一继电器和所述第二继电器均粘连；此时：
Ua＝U*R2/(R1+R2)；
Ub＝U*R8/(R7+R8)。
其中，R5为第五电阻的阻值，R6为第六电阻的阻值，R7为第三电阻与第五电阻并联的阻值，R8为第四电阻与第六电阻并联的阻值，其中：
R7＝R3*R5/(R3+R5)；
R8＝R4*R6/(R4+R6)。
进一步地，当所述差值等于第三阈值时，所述第一继电器正常，所述第二继电器粘连；此时：
Ua＝U*R2/(R1+R2)；
Ub＝U*R8/(R3+R8)。
进一步地，当所述差值等于第四阈值时，所述第一继电器粘连，所述第二继电器正常；此时：
Ua＝U*R2/(R1+R2)；
Ub＝U*R4/(R7+R4)。
本申请实施例利用提供的继电器粘连检测系统，在该继电器粘连检测系统中设置检测电路，对不同的继电器进行故障检测；具体是：设置第一电压检测器与第二电阻并联，设置第二电压检测器与第四电阻并联；通过对检测开关的开和闭的调控，获取第一电压Ua和第二电压Ub的电压值，并计算所述Ua与所述Ub的差值，根据所述差值判断继电器是否有粘连的状态出现，进而判断出第一继电器与第二继电器的对应状态。也就是说，本申请实施例提供的继 电器粘连检测系统，只需检测两个电压，通过少量的电路元件即可完成继电器粘连检测。且检测开关的引入解决了快充口带电的安规问题，检测电阻阻值可以设置的比较小，利于提高抗干扰能力，更加具有实用性。
为了更清楚地说明本申请或现有技术中的技术方案，下面将对实施例中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是现有的一种快充回路的结构示意图；
图2是现有的一种继电器粘连检测电路的结构示意图；
图3是本申请实施例提供的一种继电器粘连检测系统的结构示意图；
图4是图3中提供的一种继电器粘连检测系统进一步实现的结构示意图；
图5是本申请实施例提供的一种继电器粘连检测方法的流程示意图。
为了使本技术领域的人员更好地理解本申请方案，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”等是用于区别不同对象，而不是用于描述特定顺序。此外，术语“包括”和“具有”以及它们任何变形，意图在于覆盖不排他的包含。
在本文中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
下面对本申请实施例进行详细介绍。
请参见图3，图3是本申请实施例提供的一种继电器粘连检测系统的结构示意图。继电器粘连检测系统100包括充电电池110、快充口120、第一继电器130、第二继电器140、标准电压电路150和检测电路160。
其中，所述标准电压电路150的一端与所述充电电池110的正极相连，所述标准电压电路150的另一端与所述充电电池110的负极相连。所述检测电路160的第一端与所述第一继电器130连接充电电池的一端相连，所述检测电路160的第二端与所述第一继电器130连接快充口的一端相连，所述检测电路160的第三端与所述第二继电器140连接充电电池的一端相连，所述检测电路160的第四端与所述第二继电器140连接快充口的一端相连。
在一些可能的实施方式中，标准电压电路150中包括第一电压检测器，检测电路160中包括第二电压检测器以及检测开关。
当所述标准电压电路150中的第一电压为定值，且所述检测电路160中的第二电压与所述第一电压的差值为不同的值时，对应所述第一继电器和/或所述第二继电器处于对应状态，其中，所述对应状态包括正常状态和粘连状态。
其中，第一电压为第一电压检测器的电压读数，第二电压为第二电压检测器的电压读数。
根据本申请实施例提供的一种继电器粘连检测系统，只需检测两个电压，通过少量的电路元件即可完成继电器粘连检测。且检测开关的引入解决了快充口带电的安规问题，检测电阻阻值可以设置的比较小，利于提高抗干扰能力。
请参见图4，图4是图3中提供的一种继电器粘连检测系统进一步实现的结构示意图。
继电器粘连检测系统100包括快充口，充电电池U、第一继电器K1和第二继电器K2，所述K1连接在所述快充口和所述充电电池U的正极之间，所述K2连接在所述快充口和所述充电电池U的负极之间。
所述继电器粘连检测系统100还包括标准电压电路150和检测电路160：
检测电路160的第一端与所述第一继电器K1的一端以及所述充电电池U的正极连接，所述检测电路160的第二端与所述第一继电器K1的另一端连接，所述检测电路的第三端与所述第二继电器K2的一端以及所述充电电池U的负极连接，所述检测电路160的第四端与所述第二继电器K2的另一端连接；所述标准电压电路150一端与所述充电电池U正极连接，另一端与所述充电电 池U负极连接；当所述标准电压电路150中的第一电压为定值，且所述检测电路160中的第二电压与所述第一电压的差值为不同值时，所述第一继电器K1和/或所述第二继电器K2处于对应状态，其中，所述对应状态包括正常状态和粘连状态。
进一步地，所述标准电压电路150包括第一电阻R1和第二电阻R2；所述第一电阻R1一端与所述充电电池U的正极连接，所述第一电阻R1的另一端与所述第二电阻R2的一端连接，所述第二电阻R2的另一端与所述充电电池U的负极连接。
进一步地，所述检测电路160包括第三电阻R3、第四电阻R4、第五电阻R5、第六电阻R6：
所述第三电阻R3一端与所述充电电池U的正极以及所述第一继电器的一端连接，所述第三电阻R3的另一端与所述第四电阻R4的一端连接，所述第四电阻R4的另一端与所述充电电池U的负极以及所述第二继电器K2的一端连接；
所述第五电阻R5一端与第一继电器K1的另一端连接，所述第五电阻R5的另一端与所述第六电阻R6的一端连接，所述第六电阻R6的另一端与所述第二继电器K2的另一端连接。
进一步地，所述检测电路160还包括：检测开关K3，所述检测开关K3一端连接在所述第三电阻R3与所述第四电阻R4之间，另一端连接在所述第五电阻R5与所述第六电阻R6之间。
优选地，所述继电器粘连检测系统100还包括：第一电压检测器Ua和第二电压检测器Ub；其中，第一电压检测器Ua与第二电阻R2并联，第二电压检测器Ub与第四电阻R4并联。
具体的，第一继电器K1和第二继电器K2的状态可包括以下四种情况：
1.在第一继电器K1和第二继电器K2未出现粘连的情况下，电流信号由充电电池U的正极依次通过第一电阻R1和第二电阻R2组成的标准电压电路150以及检测电路160中的第三电阻R3和第四电阻R4后回到充电电池U的负极。
2.在第一继电器K1和第二继电器K2均出现粘连的情况下，电流信号由充电电池U的正极依次通过第一电阻K1和第二电阻K2组成的标准电压电路 150以及第三电阻R3、第四电阻R4、第五电阻R5、第六电阻R6和检测开关K3组成的检测电路160后回到充电电池U的负极。
3.在第一继电器K1未粘连，第二继电器K2出现粘连的情况下，电流信号由充电电池U的正极依次通过第一电阻R1和第二电阻R2组成的标准电压电路150、检测电路160的第三电阻R3以及检测电路160的第四电阻R4和第六电阻R6组成的并联支路后回到充电电池U的负极。
4.在第一继电器K1出现粘连，第二继电器K2未粘连的情况下，电流信号由充电电池U的正极依次通过第一电阻R1和第二电阻R2组成的标准电压电路150、检测电路160的第三电阻R3和第五电阻R5组成的并联支路以及检测电路160的第四电阻R4后回到充电电池U的负极。
请参见图5，图5是本申请实施例提供的一种继电器粘连检测方法的流程示意图。这种方法应用于本申请实施例提供的继电器粘连检测系统，可包括但不限于如下步骤：
S501、获取第一电压Ua；
S502、获取第二电压Ub；
S503、计算所述第一电压Ua和所述第二电压Ub的差值；
S504、根据所述差值判断所述第一继电器和所述第二继电器的对应状态，所述对应状态包括正常状态和粘连状态。
具体的，根据所述差值判断所述第一继电器和所述第二继电器的对应状态，包括以下四种情况：
1.当所述差值等于第一阈值时，所述第一继电器和所述第二继电器均正常，此时：
Ua＝U*R2/(R1+R2)；
Ub＝U*R4/(R3+R4)。
其中，U为充电电池的电压值，R1为第一电阻的阻值，R2为第二电阻的阻值，R3为第三电阻的阻值，R4为第四电阻的阻值。
2.当所述差值等于第二阈值时，所述第一继电器和所述第二继电器均粘连，此时：
Ua＝U*R2/(R1+R2)；
Ub＝U*R8/(R7+R8)。
其中，R5为第五电阻的阻值，R6为第六电阻的阻值，R7为第三电阻与第五电阻并联的阻值，R8为第四电阻与第六电阻并联的阻值，其中：
R7＝R3*R5/(R3+R5)；
R8＝R4*R6/(R4+R6)。
3.当所述差值等于第三阈值时，所述第一继电器正常，所述第二继电器粘连，此时：
Ua＝U*R2/(R1+R2)；
Ub＝U*R8/(R3+R8)。
4.当所述差值等于第四阈值时，所述第一继电器粘连，所述第二继电器正常，此时：
Ua＝U*R2/(R1+R2)；
Ub＝U*R4/(R7+R4)。
需要说明的是，电动汽车的电池系统一般在车辆上电或充电之前，进行继电器粘连检测。
本申请实施例利用提供的继电器粘连检测系统，在该继电器粘连检测系统中设置检测电路，对不同的继电器进行故障检测；具体是：设置第一电压检测器与第二电阻并联，设置第二电压检测器与第四电阻并联；通过对检测开关K3的开和闭的调控，获取第一电压Ua和第二电压Ub的电压值，并计算所述Ua与所述Ub的差值，根据所述差值判断继电器是否有粘连的状态出现，进而判断出第一继电器与第二继电器的对应状态。也就是说，本申请实施例提供的继电器粘连检测系统，只需检测两个电压，通过少量的电路元件即可完成继电器粘连检测。且检测开关K3的引入解决了快充口带电的安规问题，检测电阻阻值可以设置的比较小，利于提高抗干扰能力，更加具有实用性。
需要说明的是，通过合理设置R1～R6的阻值，使得不同情况下Ub与Ua的差值不相等且相差比较大，即可通过比较Ua，Ub的值判断继电器粘连情况。
举例说明：
设置：
R1＝R2＝R3＝R4＝x；
R6＝0.2x；
R5＝0.8x。
则：
Ua＝U*R2/(R1+R2)＝0.5U。
当所述检测开关K3闭合时，且Ub与Ua相等时，所述第一继电器K1和所述第二继电器K2均正常，其中：
Ua＝Ub＝U*R2/(R1+R2)＝U*R4/(R3+R4)＝0.5U。
当所述检测开关K3闭合时，且Ub与Ua不相等，Ub与Ua的差值等于0.23U时，所述第一继电器K1和所述第二继电器K2均粘连，其中：
Ub＝U*R8/(R7+R8)＝0.27U；
R7＝R3*R5/(R3+R5)＝0.44x；
R8＝R4*R6/(R4+R6)＝0.14x。
当所述检测开关K3闭合时，且Ub与Ua不相等，Ub与Ua的差值等于0.36U时，所述第一继电器K1正常，所述第二继电器K2粘连，其中：
Ub＝U*R8/(R3+R8)＝0.14U。
当所述检测开关K3闭合时，且Ub与Ua不相等，Ub与Ua的差值等于－0.19U时，所述第一继电器K1粘连，所述第二继电器K2正常，其中：
Ub＝U*R4/(R7+R4)＝0.69U。
根据本申请实施例提供的一种继电器粘连检测系统，只需检测两个电压，通过少量的电路元件即可完成继电器粘连检测。且检测开关K3的引入解决了快充口带电的安规问题，检测电阻阻值可以设置的比较小，利于提高抗干扰能力。
以上对本申请实施例进行了详细介绍，本文中应用了具体个例对本申请的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本申请的方法及其核心思想；同时，对于本领域的一般技术人员，依据本申请的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本申请的限制。
Claims (10)
- 一种继电器粘连检测系统，所述检测系统包括快充口、充电电池、第一继电器和第二继电器，所述第一继电器连接在所述快充口和所述充电电池的正极之间，所述第二继电器连接在所述快充口和所述充电电池的负极之间，其特征在于，所述检测系统还包括检测电路和标准电压电路：所述检测电路的第一端与所述第一继电器的一端以及所述充电电池的正极连接，所述检测电路的第二端与所述第一继电器的另一端连接，所述检测电路的第三端与所述第二继电器的一端以及所述充电电池的负极连接，所述检测电路的第四端与所述第二继电器的另一端连接；所述标准电压电路一端与所述充电电池正极连接，另一端与所述充电电池负极连接；当所述标准电压电路中的第一电压为定值，且所述检测电路中的第二电压与所述第一电压的差值为不同的值时，所述第一继电器和/或所述第二继电器处于对应状态，其中，所述对应状态包括正常状态和粘连状态。
- 根据权利要求1所述的继电器粘连检测系统，其特征在于，所述标准电压电路包括第一电阻和第二电阻：所述第一电阻一端与所述充电电池的正极连接，所述第一电阻的另一端与所述第二电阻的一端连接，所述第二电阻的另一端与所述充电电池的负极连接。
- 根据权利要求1所述的继电器粘连检测系统，其特征在于，所述检测电路包括第三电阻、第四电阻、第五电阻、第六电阻：所述第三电阻一端与所述充电电池的正极以及所述第一继电器的一端连接，所述第三电阻的另一端与所述第四电阻的一端连接，所述第四电阻的另一端与所述充电电池的负极以及所述第二继电器的一端连接；所述第五电阻一端与第一继电器的另一端连接，所述第五电阻的另一端与所述第六电阻的一端连接，所述第六电阻的另一端与所述第二继电器的另一端连接。
- 根据权利要求3所述的继电器粘连检测系统，其特征在于，所述检测电路还包括检测开关，所述检测开关一端连接在所述第三电阻与所述第四电阻之间，另一端连接在所述第五电阻与所述第六电阻之间。
- 根据权利要求1-4任意一项所述的继电器粘连检测系统，其特征在于，所述检测系统还包括第一电压检测器和第二电压检测器，其中，所述第一电压检测器与所述第二电阻并联，所述第二电压检测器与所述第四电阻并联；所述第一电压检测器的电压值为第一电压，所述第二电压检测器的电压值为第二电压。
- 一种继电器粘连检测方法，应用于权利要求1-5任一项所述的继电器粘连检测系统，其特征在于，包括：获取第一电压Ua；获取第二电压Ub；计算所述第一电压Ua和所述第二电压Ub的差值；根据所述差值判断所述第一继电器和所述第二继电器的对应状态，所述对应状态包括正常状态和粘连状态。
- 根据权利要求6所述的继电器粘连检测方法，其特征在于，所述根据所述差值判断所述第一继电器和所述第二继电器的对应状态，包括：当所述差值等于第一阈值时，所述第一继电器和所述第二继电器均正常；此时：Ua＝U*R2/(R1+R2)；Ub＝U*R4/(R3+R4)，其中，U为充电电池的电压值，R1为第一电阻的阻值，R2为第二电阻的阻值，R3为第三电阻的阻值，R4为第四电阻的阻值。
- 根据权利要求7所述的继电器粘连检测方法，其特征在于，所述根据所述差值判断所述第一继电器和所述第二继电器的对应状态，包括：当所述差值等于第二阈值时，所述第一继电器和所述第二继电器均粘连；此时：Ua＝U*R2/(R1+R2)；Ub＝U*R8/(R7+R8)，其中，R5为第五电阻的阻值，R6为第六电阻的阻值，R7为第三电阻与第五电阻并联的阻值，R8为第四电阻与第六电阻并联的阻值，其中：R7＝R3*R5/(R3+R5)；R8＝R4*R6/(R4+R6)。
- 根据权利要求8所述的继电器粘连检测方法，其特征在于，所述根据所述差值判断所述第一继电器和所述第二继电器的对应状态，包括：当所述差值等于第三阈值时，所述第一继电器正常，所述第二继电器粘连；此时：Ua＝U*R2/(R1+R2)；Ub＝U*R8/(R3+R8)。
- 根据权利要求9所述的继电器粘连检测方法，其特征在于，所述根据所述差值判断所述第一继电器和所述第二继电器的对应状态，包括：当所述差值等于第四阈值时，所述第一继电器粘连，所述第二继电器正常；此时：Ua＝U*R2/(R1+R2)；Ub＝U*R4/(R7+R4)。
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