CN109884525B - Adhesion detection device and method for battery pack contactor - Google Patents
Adhesion detection device and method for battery pack contactor Download PDFInfo
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- CN109884525B CN109884525B CN201711248033.8A CN201711248033A CN109884525B CN 109884525 B CN109884525 B CN 109884525B CN 201711248033 A CN201711248033 A CN 201711248033A CN 109884525 B CN109884525 B CN 109884525B
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Abstract
The invention provides a device and a method for detecting adhesion of a battery pack contactor, wherein the device comprises a battery pack, a contactor K2, a contactor K3, a resistor Rpre, a capacitor and a constant voltage signal source with voltage of Vs, wherein one end of the contactor K2 is connected with the anode of the battery pack, the other end of the contactor K2 is connected with the capacitor, the contactor K3 is connected with the resistor Rpre in series and then connected with the contactor K2 in parallel, the cathode of the battery pack is connected with the capacitor, the anode of the constant voltage signal source is connected with the anode of the battery pack, and the cathode of the constant voltage signal source is connected with the cathode of the battery pack; the method comprises the following steps: the method comprises the following steps: the battery pack is not connected, and the contactor K2 and the contactor K3 are disconnected; step two: injecting a constant voltage signal source; step three: if V2 is equal to Vs, at least one of the contactor K2 and the contactor K3 is stuck; step four: if V2 is 0, neither contactor K2 nor contactor K3 are stuck. The invention can accurately judge whether the contactors in the battery pack system are adhered or not on the premise of not closing any contactor.
Description
Technical Field
The invention relates to a battery pack contactor adhesion detection device and a battery pack contactor adhesion detection method adopting the device.
Background
The battery pack system circuit generally includes a battery module, a BMS, various contactors, and a fuse, through which the battery pack is connected. When the electric energy needs to be supplied to the electric equipment, the BMS controls the corresponding contactor to be closed, so that the battery pack is connected to the power supply circuit; when power supply to the consumers is not required, the BMS controls the respective contactors to be opened, so that the battery pack is disconnected from the power supply circuit.
However, the contactor needs to be opened and closed thousands of times in a long-term working process, and the contacts of the contactor are easily adhered due to heat and electric arcs generated by the contacts of the contactor, so that the control failure of a battery pack loop is caused, and the stability of a battery pack system is negatively affected.
At present, the adhesion detection method of the battery pack contactor is mainly realized by a battery pack contactor adhesion detection device with a circuit as shown in fig. 1. On the premise of disconnecting the K1 contactor, judging the adhesion condition of the K1 contactor through the voltage of V1; under the premise of closing the K1 contactor, the voltage of V1 and V2 is used for judging the adhesion condition of the K2 contactor and the K3 contactor. In practical engineering application, it can be found that if the K2 contactor is in a stuck state before power-on is started, the method cannot be used for judging, and in this case, closing the K1 contactor again causes the K2 contactor to be stuck and even causes a safety accident.
Disclosure of Invention
The invention provides a battery pack contactor adhesion detection device which comprises a battery pack, a contactor K2, a contactor K3, a resistor Rpre and a capacitor, wherein one end of the contactor K2 is connected with the anode of the battery pack, the other end of the contactor K3 is connected with the capacitor, the contactor K3 is connected with the resistor Rpre in series and then connected with the contactor K2 in parallel, the cathode of the battery pack is connected with the capacitor, the battery pack adhesion detection device further comprises a constant voltage signal source with voltage Vs, the anode of the constant voltage signal source is connected with the anode of the battery pack, and the cathode of the constant voltage signal source is connected with the cathode of the battery pack.
Traditional contactor adhesion detection device need insert the group battery and judge the adhesion condition of contactor K2 and K3, nevertheless because group battery output current is great, probably lead to the contactor of non-adhesion to take place the adhesion and even lead to the incident, consequently set up the constant voltage signal source and simulate the group battery to the voltage Vs value of constant voltage signal source is in safe voltage range, can judge the adhesion condition of contactor K2 and K3 safely effectively through pouring into the constant voltage signal source into.
In an embodiment of the present invention, the constant voltage source further includes a current limiting resistor R, and the current limiting resistor R is connected in series with the constant voltage signal source. The current-limiting resistor R is used for protecting the constant-voltage signal source and preventing large current from damaging the constant-voltage signal source under an accident condition.
In one embodiment of the present invention, the voltage Vs of the constant voltage signal source is selected from any value between 6V and 24V.
The constant voltage signal source is in safe voltage range, even the condition of contactor adhesion takes place, can not harm battery system's components and parts and lead to serious incident yet.
In one embodiment of the present invention, the constant voltage signal is selected from any value of 10V, 12V and 15V.
In an embodiment of the present invention, the apparatus further includes a constant voltage signal source protection module, and the constant voltage signal source protection module is connected in series with the constant voltage signal source. And the constant voltage signal source is protected.
In one embodiment of the present invention, the constant voltage signal source protection module includes at least one of an enable switch, a fuse, and a backward diode.
Constant voltage signal source protection module is used for the protection the constant voltage signal source is worked as contactor K1 does not take place the adhesion and is in under the state of disconnection, thereby it just can the closure injection to enable the switch the constant voltage signal source, in the testing process, if the accident condition takes place, for example the adhesion takes place for contactor K1, because the group battery rated voltage is far more than the constant voltage signal source, the heavy current flows backward to the constant voltage signal source easily and causes the harm to it, consequently need set up constant voltage signal source protection module and protects, through fuse fusing protection, disconnection the constant voltage signal source, or through backward diode does not allow the electric current flows backward, all can effectively protect the constant voltage signal source.
In one embodiment of the invention, the battery further comprises a contactor K1, and the contactor K1 is connected in series between the battery cells or at two ends of the battery pack.
Another object of the present invention is to provide a method for detecting adhesion of a battery pack contactor, which uses any one of the above battery pack contactor adhesion detection devices to detect that an actual voltage of a capacitor is V2, and includes the following steps:
the method comprises the following steps: the battery pack is not connected, and the contactor K2 and the contactor K3 are disconnected;
step two: a constant voltage signal source with injection voltage of Vs;
step three: if V2 is equal to Vs, at least one of the contactor K2 and the contactor K3 is stuck;
step four: if V2 is 0, neither contactor K2 nor contactor K3 are stuck.
Since V2 is theoretically ideal and there is an error in actual operation, it can be considered that the "V2 is Vs" as long as the ratio of the "difference between V2 and Vs" to the larger value of V2 and Vs "is 10% or less.
In a battery pack system, the capacitor is a large capacitor at the input end of a motor controller of electric equipment, when the capacitor is precharged, firstly the contactor K3 is closed, the contactor K2 is opened, the battery pack precharges the capacitor, the resistor Rpre can protect the precharging contactor K3 from being stuck, and when the voltage at two ends of the capacitor reaches a stable value, the contactor K2 is closed, and the contactor K3 is opened. Compare in traditional group battery system contactor adhesion detection method, through the access constant voltage signal source simulation group battery voltage power supply, and the constant voltage signal source need not any closed contactor and can detect the adhesion condition of contactor in safe voltage range, avoids closing adhesion or even incident that a certain contactor leads to probably taking place because of detecting the needs under the unclear circumstances.
If V2 is equal to Vs in the third step, at least one of the contactor K2 and the contactor K3 is stuck, and in a specific engineering application, it is not necessary to accurately determine which of the contactor K2 and the contactor K3 is stuck, but it can be determined by analyzing a rising curve of the voltage V2: under the condition that the contactor K2 is not adhered and the contactor K3 is adhered, the constant voltage signal source, the resistor Rpre and the capacitor form an RC charging and discharging circuit, the voltage V2 is infinitely close to Vs, and the change curve expression of V2 along with time t is as follows:
wherein C is the capacitance of the capacitor, and Rpre is the resistance of the resistor, so on the premise of the third step, if the change curve of the voltage V2 along with the time t conforms to the above expression, only the contactor K3 is stuck, otherwise, the contactor K2 is stuck but it cannot be determined whether the contactor K3 is stuck.
In one embodiment of the present invention, the battery pack contactor adhesion detection device further includes a contactor K1, the contactor K1 is connected in series between the battery cells or at two ends of the battery pack, the rated voltage of the battery pack is V, and Vs, the actual voltage of the battery pack is V1, and the method further includes the following steps:
step five: disconnecting the constant voltage signal source, the contactor K1, the contactor K2 and the contactor K3, and then connecting the battery pack;
step six: if V1 is equal to V, the contactor K1 is stuck;
step seven: and if the V1 is equal to 0, judging that the contactor K1 is not stuck.
Wherein Vs refers to a voltage value which is far smaller than V and is within a safe voltage range, even if unknown adhesion condition exists, serious accidents cannot be caused, V1 is a theoretical ideal condition, and an error exists in actual operation, so that the condition of V1 being equal to V can be met as long as the ratio of the difference between V1 and V to the larger value of V1 and V is less than or equal to 10%. In order to further ensure safety and avoid adhesion caused by detection requirements, the battery pack is accessed to judge whether the contactor K1 is adhered under the condition that neither the contactor K2 nor the contactor K3 is adhered.
After the technical scheme provided by the invention is used, whether the contactors in the battery pack system are adhered can be accurately judged on the premise of not closing any contactor, and the damage caused by adhesion of the contactors is avoided. The condition that can prevent to lead to unable normal work because of the abnormal output of high pressure takes place, and more importantly can prevent to appear overcharging when charging unusually and cause the harm to the battery to and prevent to appear can not effectual cutting off high pressure when the unusual condition in the driving process, lead to the overdischarge phenomenon of incident and group battery.
Drawings
FIG. 1 is a schematic diagram of a contactor stick detection circuit of a battery pack system according to the prior art;
FIG. 2 is a schematic diagram of one embodiment of the present invention;
fig. 3 is a schematic view of another embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described below with reference to the accompanying drawings, but the present invention is not limited to the following embodiments.
Example 1
As shown in fig. 2, this embodiment provides a group battery contactor adhesion detection device, including group battery, contactor K2, contactor K3, resistance Rpre and electric capacity, contactor K2 one end is connected the positive pole of group battery, and electric capacity is connected to the other end, contactor K3 with behind the resistance Rpre series connection with contactor K2 parallel connection, the group battery negative pole is connected with electric capacity, still includes the constant voltage signal source that voltage is Vs, the positive pole of constant voltage signal source with the anodal of group battery is connected, the negative pole with the negative pole of group battery is connected.
Example 2
As shown in fig. 2, this embodiment provides a group battery contactor adhesion detection device, including group battery, contactor K2, contactor K3, resistance Rpre and electric capacity, contactor K2 one end is connected the group battery anodal, and electric capacity is connected to the other end, contactor K3 with behind the resistance Rpre series connection with contactor K2 parallel connection, the group battery negative pole is connected with electric capacity, still includes voltage as Vs 6V's constant voltage signal source and current-limiting resistance R, the positive pole of constant voltage signal source with the positive pole of group battery is connected, the negative pole with the negative pole of group battery is connected, current-limiting resistance R establishes ties with the constant voltage signal source.
Example 3
As shown in fig. 2 and 3, this embodiment provides a group battery contactor adhesion detection device, including group battery, contactor K2, contactor K3, resistance Rpre and electric capacity, contactor K2 one end is connected the group battery anodal, and the electric capacity is connected to the other end, contactor K3 with behind the resistance Rpre series connection with contactor K2 parallel connection, the group battery negative pole is connected with the electric capacity, still includes voltage constant voltage signal source and the constant voltage signal source protection module that is Vs 12V, the positive pole of constant voltage signal source with the positive pole of group battery is connected, the negative pole with the negative pole of group battery is connected, constant voltage signal source protection module with the constant voltage signal source is established ties.
Example 4
As shown in fig. 3, this embodiment provides a battery pack contactor adhesion detection device, including group battery, contactor K2, contactor K3, resistance Rpre and electric capacity, contactor K2 one end is connected the positive pole of group battery, and the electric capacity is connected to the other end, contactor K3 with resistance Rpre series connection back and contactor K2 parallel connection, the group battery negative pole is connected with the electric capacity, still includes voltage is 20V's constant voltage signal source and enable switch, the positive pole of constant voltage signal source with the positive pole of group battery is connected, the negative pole with the negative pole of group battery is connected, enable switch with the constant voltage signal source is established ties.
Example 5
As shown in fig. 3, this embodiment provides a group battery contactor adhesion detection device, including group battery, contactor K2, contactor K3, resistance Rpre and electric capacity, contactor K2 one end is connected the group battery positive pole, and electric capacity is connected to the other end, contactor K3 with behind the resistance Rpre series connection with contactor K2 parallel connection, the group battery negative pole is connected with electric capacity, still includes voltage constant voltage signal source, fuse and the backward diode that is Vs, the positive pole of constant voltage signal source with the positive pole of group battery is connected, the negative pole with the negative pole of group battery is connected, fuse and backward diode with the constant voltage signal source is established ties.
Example 6
As shown in fig. 2, this embodiment provides a group battery contactor adhesion detection device, including group battery, contactor K1, contactor K2, contactor K3, resistance Rpre and electric capacity, contactor K1 establishes ties between the battery monomer or group battery both ends, contactor K2 one end is connected the group battery positive pole, and electric capacity is connected to the other end, contactor K3 with behind the resistance Rpre series connection with contactor K2 parallel connection, the group battery negative pole is connected with electric capacity, still includes the constant voltage signal source that voltage is Vs, the positive pole of constant voltage signal source with the positive pole of group battery is connected, the negative pole with the negative pole of group battery is connected.
Example 7
As shown in fig. 2, this embodiment provides a method for detecting adhesion of a battery pack contactor, which employs the device for detecting adhesion of a battery pack contactor as described in any one of embodiments 1 to 6, and an actual voltage of a detection capacitor is V2; and comprises the following steps:
the method comprises the following steps: the battery pack is not connected, and the contactor K2 and the contactor K3 are disconnected;
step two: the voltage Vs of the injection constant voltage signal source is 18V;
step three: if V2 is equal to Vs, at least one of the contactor K2 and the contactor K3 is stuck;
step four: if V2 is 0, neither contactor K2 nor contactor K3 are stuck.
Example 8
As shown in fig. 2, this embodiment provides a method for detecting adhesion of a battery pack contactor, which uses the device for detecting adhesion of a battery pack contactor according to embodiment 6, wherein the rated voltage of the battery pack is V and Vs, the actual voltage of the battery pack is V1, and the method includes the following steps:
the method comprises the following steps: the battery pack is not connected, and the contactor K2 and the contactor K3 are disconnected;
step two: the voltage Vs of the injection constant voltage signal source is 15V;
step three: if V2 is equal to Vs, at least one of the contactor K2 and the contactor K3 is stuck;
step four: if V2 is 0, neither contactor K2 nor contactor K3 are stuck;
step five: disconnecting the constant voltage signal source, the contactor K1, the contactor K2 and the contactor K3, and then connecting the battery pack;
step six: if V1 is equal to V, the contactor K1 is stuck;
step seven: if V1 is 0, the contactor K1 is not stuck.
Claims (6)
1. A battery pack contactor adhesion detection method is characterized in that: the utility model provides an adopt battery pack contactor adhesion detection device, includes battery pack, contactor K2, contactor K3, resistance Rpre and electric capacity, contactor K2 one end is connected the battery pack anodal, and electric capacity is connected to the other end, contactor K3 with behind the resistance Rpre series connection with contactor K2 parallel connection, the battery pack negative pole is connected with electric capacity, its characterized in that: still include the constant voltage signal source that voltage is Vs, the positive pole of constant voltage signal source with the positive pole of group battery is connected, the negative pole with the negative pole of group battery is connected, still includes contactor K1, contactor K1 establishes ties between the battery monomer or group battery both ends, and the actual voltage that detects electric capacity is V2 to include the following step:
the method comprises the following steps: the battery pack is not connected, and the contactor K2 and the contactor K3 are disconnected;
step two: a constant voltage signal source with injection voltage of Vs;
step three: if V2 is equal to Vs, at least one of the contactor K2 and the contactor K3 is stuck;
step four: if V2 is 0, neither contactor K2 nor contactor K3 are stuck.
2. The battery pack contactor adhesion detection method according to claim 1, characterized in that: the rated voltage of the battery pack is V, and V is larger than Vs, the actual voltage of the battery pack is detected to be V1, and the method further comprises the following steps:
step five: disconnecting the constant voltage signal source, the contactor K1, the contactor K2 and the contactor K3, and then connecting the battery pack;
step six: if V1 is equal to V, the contactor K1 is stuck;
step seven: if V1 is 0, the contactor K1 is not stuck.
3. The battery pack contactor adhesion detection method according to claim 1, characterized in that: the constant voltage source is characterized by further comprising a current limiting resistor R, wherein the current limiting resistor R is connected with the constant voltage signal source in series.
4. The battery pack contactor adhesion detection method according to claim 1, characterized in that: the voltage Vs of the constant voltage signal source is selected from any value between 6V and 24V.
5. The battery pack contactor adhesion detection method according to claim 1, characterized in that: the constant-voltage signal source protection module is connected with the constant-voltage signal source in series.
6. The battery pack contactor adhesion detection method according to claim 5, characterized in that: the constant voltage signal source protection module comprises at least one of an enable switch, a fuse and a backward diode.
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| CN110470981A (en) * | 2019-07-26 | 2019-11-19 | 东软睿驰汽车技术（沈阳）有限公司 | A kind of circuit of determining contactor state, method and device |
| CN111746283B (en) * | 2020-06-12 | 2021-12-24 | 浙江飞碟汽车制造有限公司 | Electric automobile contactor adhesion detection method |
| CN111817590B (en) * | 2020-07-23 | 2021-12-10 | 阳光电源股份有限公司 | Energy storage converter and method for detecting adhesion of slow-start switch of energy storage converter |
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| CN106842010A (en) * | 2017-01-23 | 2017-06-13 | 宁德时代新能源科技股份有限公司 | Contactor adhesion detection method, detection device and battery management system |
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| CN106696708A (en) * | 2016-11-17 | 2017-05-24 | 天津易鼎丰动力科技有限公司 | Method for judging contactor adhesion failure in high voltage circuit with battery in electric car |
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Effective date of registration: 20230728 Address after: 12603 Southwest Avenue, 300 blocks, Stanford, Texas, United States Patentee after: MICROVAST, Inc. Address before: 313000 No. 2198 Hongfeng Road, Huzhou Economic and Technological Development Zone, Zhejiang Province Patentee before: MICROVAST POWER SYSTEMS Co.,Ltd. |