CN108267686B - Relay adhesion detection method of battery pack system - Google Patents
Relay adhesion detection method of battery pack system Download PDFInfo
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- CN108267686B CN108267686B CN201611269853.0A CN201611269853A CN108267686B CN 108267686 B CN108267686 B CN 108267686B CN 201611269853 A CN201611269853 A CN 201611269853A CN 108267686 B CN108267686 B CN 108267686B
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- battery module
- battery pack
- pack system
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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
Abstract
The invention discloses a relay adhesion detection method of a battery pack system, which comprises a battery module A, a relay SW1 and a relay SW2, wherein the relay SW1 comprises a contact a and a contact b, and the anode of the battery module A is connected with the contact a of the relay SW 1; the relay SW2 comprises a contact c and a contact d, and the negative pole of the battery module A is connected with the contact c of the relay SW 2; and comprises three steps; the battery pack system can accurately judge whether the relays corresponding to the battery modules are adhered or not on the premise of not closing any relay, and can verify the accuracy of the result through two judging modes, so that the safety of the battery pack system is improved.
Description
Technical Field
The invention relates to a relay adhesion detection method of a battery pack system.
Background
The battery pack system circuit generally includes a battery module, a BMU, a BMS, various relays and a fuse, and the battery pack is connected through the various relays. When the electric energy needs to be provided for the whole vehicle, the BMS controls the corresponding relays to be closed, so that the battery pack is connected to the power supply circuit; when the energy supply to the whole vehicle is not needed, the BMS controls the corresponding relay to be disconnected, so that the battery pack is disconnected with the power supply circuit.
However, in the long-term working process of the relay, the relay needs to be opened and closed thousands of times, and the relay contacts are easily adhered due to heat and electric arcs generated by the relay contacts, so that the control failure of the battery pack loop is caused, and the stability of the battery pack system is negatively affected.
Disclosure of Invention
The invention provides a relay adhesion detection method of a battery pack system, which comprises a battery module A, a relay SW1 and a relay SW2, and is characterized in that: the relay SW1 includes a contact a and a contact b, and the positive electrode of the battery module A is connected with the contact a of the relay SW 1; the relay SW2 comprises a contact c and a contact d, and the negative pole of the battery module A is connected with the contact c of the relay SW 2; and comprises the following steps:
the method comprises the following steps: opening relay SW1 and relay SW 2;
step two: setting the detected voltage of the battery module a to V1; the detection voltage between the contact b of the relay SW1 and the contact c of the relay SW2 is set to V2; the detection voltage between the contact a of the relay SW1 and the contact d of the relay SW2 is set to V3;
step three: if V1 is approximately equal to V2, judging that SW1 is adhered; if V1 is approximately equal to V3, SW2 is judged to be stuck.
Wherein, V1 ≈ V2 means that the ratio of "the difference between V1 and V2" to "the larger of V1 and V2" is 10% or less; v1 ≈ V3 means that the ratio of "the difference between V1 and V3" to "the larger of V1 and V3" is 10% or less.
In the battery pack system, the anode and the cathode of the battery module A are respectively connected with the relays SW1 and SW2 in series and then connected to the power supply circuit, and the relays can control whether the battery module A is connected with the power supply circuit.
The method does not limit the number of the battery modules in the battery pack system, and can finish the adhesion detection of the related relays according to the method provided by the invention on the premise that each battery module is connected with the relay in series.
As an embodiment of the present invention, the battery module B further comprises a battery module B, the contact B of the relay SW1 is connected with the positive pole of the battery module B, the contact d of the relay SW2 is connected with the negative pole of the battery module B, and the detection voltage of the battery module B is set to V4; if V3 is approximately equal to V4, SW1 is judged to be stuck. Wherein V3 ≈ V4 means that the ratio of "the difference between V3 and V4" to "the larger of V3 and V4" is 10% or less.
In the case where the battery pack system further includes the battery module B, the contact B of the relay SW1 is connected to the positive electrode of the battery module B, the contact d of the relay SW2 is connected to the negative electrode of the battery module B, and the detection voltage of the battery module B is set to V4; if V3 is approximately equal to V4, SW1 is judged to be stuck. The judgment of whether the SW1 is adhered or not is more accurate under the combined action of the first detection step, the second detection step and the third detection step.
As an embodiment of the present invention, the battery module B further comprises a battery module B, the contact B of the relay SW1 is connected with the positive pole of the battery module B, the contact d of the relay SW2 is connected with the negative pole of the battery module B, and the detection voltage of the battery module B is set to V4; if V2 is approximately equal to V4, SW2 is judged to be stuck. Wherein V2 ≈ V4 means that the ratio of "the difference between V2 and V4" to "the larger of V2 and V4" is 10% or less.
In the case where the battery pack system further includes the battery module B, the contact B of the relay SW1 is connected to the positive electrode of the battery module B, the contact d of the relay SW2 is connected to the negative electrode of the battery module B, and the detection voltage of the battery module B is set to V4; if V2 is approximately equal to V4, SW2 is judged to be stuck. The judgment of whether the SW2 is adhered or not is more accurate under the combined action of the first detection step, the second detection step and the third detection step.
The battery module further comprises a battery module B, wherein a relay SW3 is connected in series between the positive pole of the battery module A and the negative pole of the battery module B; the relay SW3 is turned off, and if V2 is approximately equal to V1+ V4, the SW3 is judged to be stuck. Wherein V2 ≈ V1+ V4 means that the ratio of "the difference between V2 and V1+ V4" to "the larger of V2 and V1+ V4" is 10% or less.
The relay SW3 is connected in series between the positive electrode of the battery module a and the negative electrode of the battery module B, so that the connection relationship between the battery module a and the battery module B can be changed by opening and closing the relay SW 3.
In one embodiment of the present invention, if V1 ≈ V2 ≈ V3, it is determined that SW1 and SW2 are stuck.
If V1 is approximately equal to V2 is approximately equal to V3, judging that SW1 and SW2 are adhered; the judgment of whether the SW1 and the SW2 are adhered or not can be more accurate under the combined action of the detection steps I, II and III.
After the technical scheme provided by the invention is used, whether the relays corresponding to the battery module are adhered or not can be accurately judged on the premise of not closing any relay, and the abnormal output of high voltage caused by closing a certain relay is avoided, so that the dangerous condition is caused; and the accuracy of the result can be verified through two judgment modes, and the safety of the battery pack system is improved.
Drawings
FIG. 1 is a schematic diagram illustrating adhesion detection of a relay in a battery pack system according to the present disclosure;
FIG. 2 is a schematic diagram of relay adhesion detection in another battery pack system according to the present disclosure;
fig. 3 is a schematic diagram illustrating electrical relay adhesion detection in another battery pack system according to the present disclosure.
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
The present embodiment provides a method for detecting the relay adhesion of a battery pack system, as shown in fig. 1, including a battery module a, a relay SW1 and a relay SW2, wherein the relay SW1 includes a contact a and a contact b, and the positive electrode of the battery module a is connected to the contact a of the relay SW 1; the relay SW2 includes a contact c and a contact d, and the negative electrode of the battery module A is connected with the contact c of the relay SW 2; the method comprises the following steps:
the method comprises the following steps: opening relay SW1 and relay SW 2;
step two: setting the detected voltage of the battery module a to V1; the detection voltage between the contact b of the relay SW1 and the contact c of the relay SW2 is set to V2; the detection voltage between the contact a of the relay SW1 and the contact d of the relay SW2 is set to V3;
step three: if V1 is approximately equal to V2, judging that SW1 is adhered; if V1 is approximately equal to V3, SW2 is judged to be stuck.
Example 2
The present embodiment provides a method for detecting the relay adhesion of a battery pack system, as shown in fig. 2, including a battery module a, a relay SW1 and a relay SW2, wherein the relay SW1 includes a contact a and a contact b, and the positive electrode of the battery module a is connected to the contact a of the relay SW 1; the relay SW2 includes a contact c and a contact d, and the negative electrode of the battery module A is connected with the contact c of the relay SW 2; the method comprises the following steps:
the method comprises the following steps: opening relay SW1 and relay SW 2;
step two: setting the detected voltage of the battery module a to V1; the detection voltage between the contact b of the relay SW1 and the contact c of the relay SW2 is set to V2; the detection voltage between the contact a of the relay SW1 and the contact d of the relay SW2 is set to V3;
step three: if V1 is approximately equal to V2, judging that SW1 is adhered; if V1 is approximately equal to V3, SW2 is judged to be stuck.
The battery module B is further included, the contact B of the relay SW1 is connected with the positive pole of the battery module B, the contact d of the relay SW2 is connected with the negative pole of the battery module B, and the detection voltage of the battery module B is set to be V4; if V3 is approximately equal to V4, judging that SW1 is adhered; if V2 is approximately equal to V4, SW2 is judged to be stuck. And under the combined action of the first detection step, the second detection step and the third detection step, whether the SW1 and the SW2 are adhered or not is judged.
Example 3
The present embodiment provides a method for detecting the relay adhesion of a battery pack system, as shown in fig. 3, including a battery module a, a relay SW1 and a relay SW2, wherein the relay SW1 includes a contact a and a contact b, and the positive electrode of the battery module a is connected to the contact a of the relay SW 1; the relay SW2 includes a contact c and a contact d, and the negative electrode of the battery module A is connected with the contact c of the relay SW 1; the relay SW1 and the relay SW2 are connected in parallel, and the method comprises the following steps:
the method comprises the following steps: opening relay SW1 and relay SW 2;
step two: setting the detected voltage of the battery module a to V1; the detection voltage between the contact b of the relay SW1 and the contact c of the relay SW2 is set to V2; the detection voltage between the contact a of the relay SW1 and the contact d of the relay SW2 is set to V3;
step three: if V1 is approximately equal to V2, judging that SW1 is adhered; if V1 is approximately equal to V3, SW2 is judged to be stuck.
The battery module B is also included, and a relay SW3 is connected in series between the positive pole of the battery module A and the negative pole of the battery module B; the relay SW3 is turned off, and if V2 is approximately equal to V1+ V4, the SW3 is judged to be stuck.
It should be noted that the above description is only intended to explain the principle of the present invention, and should not be interpreted as a specific limitation of the scope of the present invention in any way. Based on the explanations herein, those skilled in the art will appreciate that other embodiments of the present invention or equivalents thereof without inventive step, are also within the scope of the present invention.
Claims (4)
1. A relay adhesion detection method of a battery pack system comprises a battery module A, a relay SW1 and a relay SW2, and is characterized in that: the relay SW1 includes a contact a and a contact b, and the positive electrode of the battery module A is connected with the contact a of the relay SW 1; the relay SW2 comprises a contact c and a contact d, and the negative pole of the battery module A is connected with the contact c of the relay SW 2; and comprises the following steps:
the method comprises the following steps: opening relay SW1 and relay SW 2;
step two: setting the detected voltage of the battery module a to V1; the detection voltage between the contact b of the relay SW1 and the contact c of the relay SW2 is set to V2; the detection voltage between the contact a of the relay SW1 and the contact d of the relay SW2 is set to V3;
step three: if the ratio of the difference value between V1 and V2 to the larger value of V1 and V2 is less than or equal to 10%, judging that SW1 is adhered; if the ratio of the difference value between V1 and V3 to the larger value of V1 and V3 is less than or equal to 10%, judging that SW2 is adhered;
the battery module B is further included, a contact B of the relay SW1 is connected with the positive electrode of the battery module B, a contact d of the relay SW2 is connected with the negative electrode of the battery module B, and the detection voltage of the battery module B is set to be V4; a relay SW3 is connected in series between the positive electrode of the battery module A and the negative electrode of the battery module B; and (3) switching off the relay SW3, and judging that the SW3 is adhered if the ratio of the difference value between the V2 and the V1+ V4 to the larger value of the V2 and the V1+ V4 is less than or equal to 10%.
2. The method of claim 1, wherein the method comprises: and if the ratio of the difference value between the V3 and the V4 to the larger value of the V3 and the V4 is less than or equal to 10%, judging that the SW1 is blocked.
3. The method of claim 1, wherein the method comprises: and if the ratio of the difference value between the V2 and the V4 to the larger value of the V2 and the V4 is less than or equal to 10%, judging that the SW2 is blocked.
4. The method of claim 1, wherein the method comprises: and if the ratio of the difference value between any two of V1, V2 and V3 to the larger value of the two is less than or equal to 10%, judging that the SW1 and the SW2 are adhered.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611269853.0A CN108267686B (en) | 2016-12-30 | 2016-12-30 | Relay adhesion detection method of battery pack system |
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| CN201611269853.0A CN108267686B (en) | 2016-12-30 | 2016-12-30 | Relay adhesion detection method of battery pack system |
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| CN108267686B true CN108267686B (en) | 2021-05-11 |
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| CN110733348A (en) * | 2018-12-29 | 2020-01-31 | 长城汽车股份有限公司 | battery management method and device |
| CN110514988A (en) * | 2019-08-05 | 2019-11-29 | 北京长城华冠汽车科技股份有限公司 | Relay fault detection method, device, electric vehicle |
| CN114217216A (en) * | 2021-11-30 | 2022-03-22 | 上海瑞浦青创新能源有限公司 | Relay detection circuit and detection method and system thereof |
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| CN104391241B (en) * | 2014-10-13 | 2018-03-06 | 惠州市亿能电子有限公司 | A kind of electrokinetic cell high-voltage relay state detection circuit and its method |
| CN105988082B (en) * | 2015-02-13 | 2019-03-26 | 广州汽车集团股份有限公司 | The relay status detection method and device of electric automobile high-voltage system |
| CN204556787U (en) * | 2015-03-13 | 2015-08-12 | 北汽福田汽车股份有限公司 | A kind of relay status monitoring device and there is its battery management system |
| CN105137336B (en) * | 2015-07-29 | 2018-07-24 | 南通大学 | Detect the diagnostic method of electric automobile high-voltage relay failure |
| CN205665378U (en) * | 2016-06-15 | 2016-10-26 | 宁德时代新能源科技股份有限公司 | Relay adhesion detection circuitry |
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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. |