CN203825132U - Multipoint insulation fault detection circuit for output bus of power battery - Google Patents
Multipoint insulation fault detection circuit for output bus of power battery Download PDFInfo
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- CN203825132U CN203825132U CN201320797936.2U CN201320797936U CN203825132U CN 203825132 U CN203825132 U CN 203825132U CN 201320797936 U CN201320797936 U CN 201320797936U CN 203825132 U CN203825132 U CN 203825132U
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Abstract
The utility model discloses a multipoint insulation fault detection circuit for an output bus of a power battery, and the circuit comprises a signal collection circuit and a signal detection circuit, which are connected with each other. The signal collection unit consists of a resistor balance bridge. The positive and negative electrodes of the battery respectively serve as a first detection point and a second detection point, and two ends of a load bus respectively serve as a third detection point and a fourth detection point. The circuit also comprises a switch change-over array which consists of a switch K1, a switch K2, a switch K3 and a switch K4, wherein the four switches are respectively connected with the first detection point, the second detection point, the third detection point, and the fourth detection point. The switches K1 and K3 are respectively connected to one end of the resistor balance bridge, and the switches K2 and K4 are respectively connected to the other end of the resistor balance bridge. Based on a conventional insulation detection circuit, the circuit provided by the utility model achieves that one insulation fault detection circuit completes the multipoint insulation fault detection through the switch change-over array.
Description
Technical field
The insulation that the utility model relates to electrokinetic cell detects, particularly electrokinetic cell output bus multiple spot insulation failure detection circuit.
Background technology
Insulation failure detection function is one of basic function of electrokinetic cell system application, and this function is generally realized by battery management system at present, and is the state of insulation that detects power battery pack bus two ends.Between electrokinetic cell bus and load, be generally all designed with the switching devices such as relay, system is the demand of safety and fault diagnosis location, need battery system before closed output relay, the state of insulation of load bus to be monitored and to be detected, general way is to increase in addition a set of insulation detection device.This has increased system complexity and cost undoubtedly.The art of this patent designs a kind of circuit, can realize the insulation fault that single insulation detecting circuit detects electrokinetic cell bus and load bus simultaneously, and can accurately locate.
Present stage, electrokinetic cell or energy-storage battery system be the supporting installation battery management system of meeting generally, wherein, for meeting the security requirement of battery system, all can in battery management system, design insulation detecting circuit, the state of insulation of electrokinetic cell bus is monitored and detected.
Electrokinetic cell output to load, be generally designed with the switching device of relay or contactor.When switching device closure, battery system powering load, now battery management system insulation detecting circuit is simultaneously also to load bus insulation failure detection.If load bus exists insulation fault, after only having the relay closes of waiting until, by battery management system, detected.According to the security requirement of system, in the situation that load bus exists insulation fault, be not allow battery management system closing relay, connect the load of battery system.
And will realize the state of insulation to load bus before closing relay, monitor, generally needing increases an independently insulation failure detection equipment in load-side in addition.The problem that adopts this kind of solution mainly to exist has 3 points: increased the complicacy of system, affected system reliability; The existing insulation detecting circuit of the system newly increasing and battery management system accesses bus after relay closes simultaneously, can lower bus equivalent resistance over the ground, and can accuracy of detection each other be exerted an influence; Finally, the increase of new equipment, the increase that also can bring cost.
Utility model content
For overcoming the shortcomings and deficiencies of above-mentioned prior art, the utility model provides a kind of electrokinetic cell output bus multiple spot insulation failure detection circuit.
The technical solution adopted in the utility model is:
An electrokinetic cell output bus multiple spot insulation failure detection circuit, comprises interconnective signal acquisition circuit and signal deteching circuit, and described signal acquisition circuit is comprised of resistance balance bridge; Respectively using the positive and negative electrode of battery power feeds as the first check point, the second check point, using the two ends of load bus as the 3rd check point and the 4th check point; Described multiple spot insulation failure detection circuit also comprises the switching over array being comprised of the K switch 1, K2, K3 and the K4 that are connected with the first check point, the second check point, the 3rd check point, the 4th check point respectively, described K switch 1, K3 are connected to one end of resistance balance bridge, and K switch 2, K4 are connected to the other end of resistance balance bridge.
Concrete, between described the first check point and the 3rd check point, be connected with respectively relay switch S1, S2 between the second check point and the 4th check point.
Concrete, described resistance balance bridge comprises resistance R 1, the R2 being connected between K switch 1 and car body ground, and is connected on resistance R 3, R4 between K switch 2 and car body ground; Node between node between resistance R 1 and R2 and resistance R 3 and R4 is connected to signal deteching circuit as the output of signal acquisition circuit.
Preferably, the switching of described switching over array is controlled by the MCU of the battery management system of electrokinetic cell.
Electrokinetic cell output bus multiple spot insulation failure detection circuit described in the utility model, on existing insulation detecting circuit, by switching over array, realize single cover insulation failure detection circuit and carry out multiple spot insulation failure detection, the fixation and recognition function that possesses battery system and load bus insulation fault can also reduce the existence simultaneously of many covers insulation system and bus and the abnormal occurrence that occurs simultaneously, and scheme is relatively simple, cost increase is lower, and circuit modification upgrading is convenient.
Accompanying drawing explanation
Fig. 1 is the system applies block diagram of electrokinetic cell output bus multiple spot insulation failure detection circuit described in the utility model;
Fig. 2 is the schematic diagram of realizing of electrokinetic cell output bus multiple spot insulation failure detection circuit described in the utility model.
Embodiment
For the ease of it will be appreciated by those skilled in the art that below in conjunction with accompanying drawing and embodiment, the utility model is explained in further detail.
As shown in Figure 1, the electrokinetic cell output bus multiple spot insulation failure detection circuit that the utility model discloses, respectively using the positive and negative electrode of battery power feeds as the first check point, the second check point, using the two ends of load bus as the 3rd check point and the 4th check point, between described the first check point and the 3rd check point, be connected with respectively relay switch S1, S2 between the second check point and the 4th check point.Before relay closes, battery management system can be realized respectively the insulation failure detection to the first check point, the second check point, the 3rd check point and the 4th check point by testing circuit.
As shown in Figure 2, described electrokinetic cell output bus multiple spot insulation failure detection circuit, comprises interconnective signal acquisition circuit and signal deteching circuit, and described signal acquisition circuit is comprised of resistance balance bridge; Described multiple spot insulation failure detection circuit also comprises the switching over array being comprised of the K switch 1, K2, K3 and the K4 that are connected with the first check point, the second check point, the 3rd check point, the 4th check point respectively, and the switching of described switching over array is controlled by the MCU of the battery management system of electrokinetic cell.Described K switch 1, K3 are connected to one end of resistance balance bridge, and K switch 2, K4 are connected to the other end of resistance balance bridge.Described resistance balance bridge comprises resistance R 1, the R2 being connected between K switch 1 and car body ground, and is connected on resistance R 3, R4 between K switch 2 and car body ground; Node between node between resistance R 1 and R2 and resistance R 3 and R4 is connected to signal deteching circuit as the output of signal acquisition circuit.
During specific works, the switching of the MCU gauge tap switching array of battery management system:
(a) when gauge tap K1 and K switch 2 closure, can realize the insulation of the first check point and the second check point is detected;
(b) when gauge tap K1 and K switch 4 closure, can realize the insulation of the first check point and the 4th check point is detected;
(c) when gauge tap K3 and K switch 2 closure, can realize the insulation of the 3rd check point and the second check point is detected;
(d), when gauge tap K3 and K switch 4 is closed, to not realizing insulation with balanced bridge method, detects, but to the testing circuit that small signal driving or electric current inject, be still to realize the insulation of the 3rd check point and the 4th check point is detected.
When the first check point or the second check point being detected and have insulation fault, illustrate that battery system exists insulation fault; When the 3rd check point or the 4th check point have insulation fault, illustrate that load exists insulation fault.
Be more than wherein specific implementation of the present utility model, it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these apparent replacement forms all belong to protection domain of the present utility model.
Claims (4)
1. an electrokinetic cell output bus multiple spot insulation failure detection circuit, comprises interconnective signal acquisition circuit and signal deteching circuit, and described signal acquisition circuit is comprised of resistance balance bridge; It is characterized in that: respectively using the positive and negative electrode of battery power feeds as the first check point, the second check point, using the two ends of load bus as the 3rd check point and the 4th check point; Described multiple spot insulation failure detection circuit also comprises the switching over array of the K switch 1, K2, K3 and the K4 composition that are connected with the first check point, the second check point, the 3rd check point, the 4th check point respectively, described K switch 1, K3 are connected to one end of resistance balance bridge, and K switch 2, K4 are connected to the other end of resistance balance bridge.
2. electrokinetic cell according to claim 1 output bus multiple spot insulation failure detection circuit, is characterized in that: between described the first check point and the 3rd check point, be connected with respectively relay switch S1, S2 between the second check point and the 4th check point.
3. electrokinetic cell according to claim 1 is exported bus multiple spot insulation failure detection circuit, it is characterized in that: described resistance balance bridge comprises resistance R 1, the R2 being connected between K switch 1 and car body ground, and be connected on resistance R 3, R4 between K switch 2 and car body ground; Tie point between tie point between resistance R 1 and R2 and resistance R 3 and R4 is connected to signal deteching circuit as the output terminal of signal acquisition circuit.
4. electrokinetic cell output bus multiple spot insulation failure detection circuit according to claim 1, is characterized in that: the switching of described switching over array is controlled by the MCU of battery management system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320797936.2U CN203825132U (en) | 2013-12-09 | 2013-12-09 | Multipoint insulation fault detection circuit for output bus of power battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320797936.2U CN203825132U (en) | 2013-12-09 | 2013-12-09 | Multipoint insulation fault detection circuit for output bus of power battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203825132U true CN203825132U (en) | 2014-09-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320797936.2U Withdrawn - After Issue CN203825132U (en) | 2013-12-09 | 2013-12-09 | Multipoint insulation fault detection circuit for output bus of power battery |
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| CN (1) | CN203825132U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675591A (en) * | 2013-12-09 | 2014-03-26 | 惠州市亿能电子有限公司 | Multipoint insulation fault detection circuit of power battery output bus |
| CN109444549A (en) * | 2018-10-24 | 2019-03-08 | 宁波普瑞均胜汽车电子有限公司 | A kind of quick detection circuit and method of vehicle body insulation |
-
2013
- 2013-12-09 CN CN201320797936.2U patent/CN203825132U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103675591A (en) * | 2013-12-09 | 2014-03-26 | 惠州市亿能电子有限公司 | Multipoint insulation fault detection circuit of power battery output bus |
| CN103675591B (en) * | 2013-12-09 | 2016-08-17 | 惠州市亿能电子有限公司 | A kind of electrokinetic cell output bus multipoint insulation fault detection circuit |
| CN109444549A (en) * | 2018-10-24 | 2019-03-08 | 宁波普瑞均胜汽车电子有限公司 | A kind of quick detection circuit and method of vehicle body insulation |
| CN109444549B (en) * | 2018-10-24 | 2021-04-06 | 宁波普瑞均胜汽车电子有限公司 | Rapid detection method for vehicle body insulation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140910 Effective date of abandoning: 20160817 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |