CN201867452U - Grounding resistance detection system for power battery pack - Google Patents
Grounding resistance detection system for power battery pack Download PDFInfo
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- CN201867452U CN201867452U CN2010205127951U CN201020512795U CN201867452U CN 201867452 U CN201867452 U CN 201867452U CN 2010205127951 U CN2010205127951 U CN 2010205127951U CN 201020512795 U CN201020512795 U CN 201020512795U CN 201867452 U CN201867452 U CN 201867452U
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- battery pack
- power battery
- resistance
- voltage
- over switch
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Abstract
The utility model relates to a grounding resistance detection system for a power battery pack, which is provided with a controller and a detection circuit, wherein the detection circuit is provided with an analog power supply (VS), a controlled change-over switch (K), a first resistor (RA) and a second resistor (RB); the first resistor (RA) is connected to one electrode side of the power battery pack and connected to a grounding point via the controlled change-over switch (K) and the analog power supply (VS); the second resistor (RB) is connected to the other electrode side of the power battery pack and directly connected to the grounding point via the controlled change-over switch (K); and the controller is connected with the detection circuit and used for controlling change-over of the controlled change-over switch (K). The grounding resistance detection system can simultaneously detect positive grounding resistance and negative grounding resistance when an electric device such as an electric vehicle runs, the circuit has simple structure, the detection circuit is controlled by the controller, the programming is easy, an interface is simple, the work is reliable, and the grounding resistance detection system is applicable to popularization.
Description
Technical field
The utility model relates to the power battery pack field, particularly, relates to a kind of stake resistance detection system of power battery pack.
Background technology
So-called stake resistance, be exactly that electric current flows into the resistance that the earth flows to another grounding body or run into to diffusion at a distance through the earth again by earthing device, generally speaking, stake resistance comprises that the resistance of the earth between contact resistance between the resistance of resistance, grounding body and the earth of ground wire and grounding body itself and two grounding bodies or grounding body are to infinitely great ground resistance at a distance.
Some electrical equipments, for example electric automobile adopts power battery pack to carry out high voltage supply.The factors such as wearing out or make moist of high-voltage cable insulating medium usually can be led and put insulation degree decline between high-voltage cable and the chassis; the both positive and negative polarity of power battery pack will produce electric leakage by the loop that insulating medium and chassis form; this entail dangers to also can have influence on the operate as normal of whole-control system simultaneously to passenger's safety.So, detect the size of power battery pack stake resistance in real time, for the operate as normal and the normal operation of vehicle of the safety that guarantees the passenger, whole-control system significance is arranged.
But, still lack the detection system that a cover effectively detects the power battery pack stake resistance at present.In view of this, the stake resistance detection system that needs a kind of power battery pack.
The utility model content
The purpose of this utility model provides a kind of stake resistance detection system of power battery pack, can be effectively the stake resistance of power battery pack being detected, and fully guarantees electrical equipment, for example normal operation of electric motor car.
Above-mentioned purpose is achieved through the following technical solutions: the stake resistance detection system of power battery pack, be provided with controller and testing circuit, described testing circuit is provided with analog power, controlled change-over switch, first resistance and second resistance, wherein said first resistance is connected in a lateral electrode of described power battery pack, and be connected to earth point via controlled change-over switch, analog power, described second resistance is connected in the opposite side electrode of described power battery pack separably, and is connected directly to described earth point via described controlled change-over switch; Described controller is connected in described testing circuit, and controls the switching of described controlled change-over switch.
Preferably, described controller is a single-chip microcomputer, and be provided with sampling module, control transformation module and computing module, wherein said sampling module is gathered the voltage at the tie point place of described first resistance and described power battery pack when described controlled change-over switch is in diverse location, the voltage at the tie point place of described second resistance and described power battery pack, the voltage of described analog power and the voltage of described power battery pack, and dwindle by each voltage signal values that subtracter will be gathered, and then carry each voltage signal by the linear optical coupling isolator, described control transformation module receives the voltage signal of described sampling module conveying and voltage signal is carried out analog to digital conversion, and described computing module is to carrying out computing through analog-to-digital signal.
Preferably, the output voltage amplitude of described analog power keeps synchronously by the amplitude of the voltage of DC-DC isolating transformer and described power battery pack.
Preferably, described controller also is connected in display system.
The utility model adopts controller to control controlled change-over switch, detects under different situations by the voltage to the tie point of testing circuit, is calculated by controller then and obtains stake resistance.Advantage of the present utility model is, when electrical equipment, the operation of for example electric automobile, can detect positive stake resistance and negative stake resistance simultaneously.The circuit structure of stake resistance detection system of the present utility model is simple, and testing circuit is controlled by controller, is easy to programming, and interface is simple, and reliable operation is suitable for applying.
Description of drawings
Fig. 1 is the structural principle block diagram of the stake resistance detection system of the utility model power battery pack;
Fig. 2 is the formation principle illustration figure of the analog power of the utility model stake resistance detection system;
Fig. 3 is the connection diagram of the sample circuit of the utility model stake resistance detection system;
Fig. 4 is the control principle synoptic diagram of the controller of the utility model stake resistance detection system.
Embodiment
Describe the stake resistance detection system of the utility model power battery pack in detail below in conjunction with accompanying drawing.
Referring to shown in Figure 1, wherein the resistance R of dotted line position+, R-is stake resistance to be detected.The stake resistance detection system of the disclosed power battery pack of the utility model is provided with controller and testing circuit, and described testing circuit is provided with analog power V
S, first resistance R that equates of controlled change-over switch K and resistance
AWith second resistance R
B, wherein said first resistance R
ABe connected in a lateral electrode of described power battery pack, and via controlled change-over switch K, analog power V
SBe connected to earth point, described second resistance R
BBe connected in the opposite side electrode of described power battery pack, and be connected directly to described earth point via described controlled change-over switch K; Described controller is connected in described testing circuit, and controls the switching of described controlled change-over switch.
Analog power VS can form in several ways, for example, and referring to shown in Figure 2, preferably, can adopt the voltage (for example 24V) of power battery pack is input voltage, by the high-frequency DC-DC isolating transformer, produce two groups of voltages, one group is the analog power V that uses in the detection system
S, the voltage V of its output voltage amplitude and power battery pack
BATAmplitude synchronous, another the group for control usefulness accessory power supply VCC.The power of VS power supply is little, but stability, ripple requires high.Use the method for figure, simple in structure, device is few, and key is easy to control.VCC is one group of tap in the transformer, has added a diode rectification just, is mainly used in two metal-oxide-semiconductors that drive among Fig. 4, and is less demanding, as long as add a three-terminal regulator block behind diode.Certainly, analog power V
SCan adopt multiple formation method, and be not limited to this acquisition by the DC-DC isolating transformer.
Followingly describe principle and the operating process that detection system of the present utility model detects stake resistance with reference to Fig. 1, wherein, R+, R-are the stake resistances that will measure.Need to prove that relevant Calculating of Ground Resistance can adopt multiple computing method, exemplarily illustrates wherein a kind of below in conjunction with associative operation process of the present utility model.In addition, calculate for simplifying, the resistance value of the first resistance R A and the second resistance R B can be set to be R, and therefore unification is represented with R in following formula.
When measuring, by the interface isolated controlling of controller K is got to 1 position, obtain a system of equations (1) based on Kirchhoff's theorem,
V wherein
AFor among Fig. 1 as the controlled change-over switch K voltage that A is ordered during in 1 position, V
BFor among Fig. 1 when the controlled change-over switch K voltage that B is ordered during in 1 position.
By the interface of controller isolated controlling K is got to 2 positions again, obtains a system of equations (2),
V wherein
A' be as the controlled change-over switch K voltage that A is ordered during in 2 positions, V among Fig. 1
B' be when the controlled change-over switch K voltage that B is ordered during in 2 positions among Fig. 1.
In above-mentioned formula (1) and (2), apparently, V
A-V
B=V
BAT(being the voltage of power battery pack), V
A'-V
B'=V
BAT, join the group (1) of solving an equation, (2) obtain a system of equations (3)
As long as measure the V of controlled change-over switch K in 1 position and 2 positions
AAnd V
A' value and V
SJust can calculate the numerical value of R+ and R-with the value of VBAT.
Controlled change-over switch K can measure by multiple known circuit in the VA of 1 position and 2 positions and the value of VA ' and the value of VS and VBAT.For example, referring to Fig. 3 and Fig. 4, preferably, described controller is a single-chip microcomputer, and is provided with sampling module, control transformation module and computing module, and wherein said sampling module is gathered described first resistance R when described controlled change-over switch K is in diverse location
AVoltage, described second resistance R with the tie point A place of described power battery pack
BVoltage, described analog power V with the tie point B place of described power battery pack
SVoltage and described power battery pack V
BATVoltage, and dwindle by each voltage signal values that subtracter will be gathered, and then carry each voltage signal by the linear optical coupling isolator, described control transformation module receives the voltage signal of described sampling module conveying and voltage signal is carried out analog to digital conversion, and described computing module is to carrying out computing through analog-to-digital signal.
Particularly, referring to Fig. 3, V
BATVoltage can sample by difference, the positive and negative both end voltage of high voltage power electric battery by electric resistance partial pressure, is handled to obtain through subtracter.Wherein D2B is high-precision operational amplifier.Other voltage (V
A, V
B, V
S) all be by behind the electric resistance partial pressure, deliver to high-precision operational amplifier, obtain after treatment.
Referring to Fig. 4, when starting insulation resistance test system, output one low level in the P0.3 of single-chip microcomputer, P0.2 exports high level, makes U3 work, and U4 does not work.The current potential of G2 uprises, and makes the suburb, V2 field among Fig. 3 should manage conducting, and conducting should be managed in suburb, V3 field, and this is equivalent to, and controlled change-over switch K is in 1 position among Fig. 1.Output one high level in the P0.3 of single-chip microcomputer, the P0.2 output low level makes U3 one work, and U4 work makes that not conducting should be managed in the suburb, V2 field among Fig. 3, and conducting should be managed in suburb, V3 field, and this is equivalent to, and controlled change-over switch K is in 2 positions in Fig. 1.When quitting work during insulation resistance test system, P0.3, P0.2 export high level, the V2 among Fig. 3, and not conductings should be managed in suburb, V3 field.
No matter when position 1, still when position 2, all be single-chip microcomputer by controlling P0.0, the height of the level of P0.1 removes to control U1, the duty of U2, and further go to control the strobe state of simulant electronic switch V4 is with each road sampled voltage (V
BAT, V
S, V
B, V
A) deliver to high precision operating amplifier D3A successively.The output warp of D3A is isolated optocoupler D5, delivers to high precision operating amplifier D4B again.Single-chip microcomputer P0.4 is delivered in the output of D4B.After the logical analog to digital conversion of single-chip microcomputer, calculate each and magnitude of voltage, and then, calculate the size of positive and negative stake resistance, and and then deliver to display system and go demonstration with the formula of system of equations (3).All voltage samples all pass through high precision operating amplifier, to improve its accuracy.
In addition, in order to improve measuring accuracy, all add RC filtering in all voltage sample loops.Single-chip microcomputer is when measuring, and each road voltage is all measured repeatedly and averaged, and can increase interference protection measure in single-chip microcomputer.
This shows that the stake resistance detection system of the disclosed power battery pack of the utility model adopts the controller controlled change-over switch of control automatically, detect by voltage during at diverse location the respective point in loop in described controlled change-over switch., calculating stake resistance by controller then, its advantage is: no matter car can both be surveyed positive ground connection and the quantitative resistance of negative ground connection when operation or when static simultaneously.Moreover, it it may also be pointed out that positive bus-bar ground connection or negative busbar ground connection, and shows by display system, in time provides information for the driver.In addition, because first resistance R
AWith second resistance R
BBe separable connection, (for example make controlled change-over switch K be in meta, promptly neither be in position 1 not measuring to disconnect with power battery pack, be not in position 2 yet), therefore, when not carrying out grounding resistance measurement, there is no resistance eutral grounding, thereby reduced the possibility of vehicle body electric leakage.In addition, the circuit structure of stake resistance detection system of the present utility model is simple, and testing circuit is controlled by controller, is easy to programming, and interface is simple, and reliable operation is suitable for applying.
Each concrete technical characterictic described in above-mentioned embodiment can carry out combination in any by any suitable manner, and it falls within the scope disclosed in the utility model equally.In addition, also can carry out combination in any between the various embodiment of the present utility model, as long as it is without prejudice to thought of the present utility model, it should be considered as content disclosed in the utility model equally.
Below describe preferred implementation of the present utility model in conjunction with the accompanying drawings in detail; but; the utility model is not limited to the detail in the above-mentioned embodiment; in technical conceive scope of the present utility model; can carry out multiple simple variant to the technical solution of the utility model, these simple variant all belong to protection domain of the present utility model.Protection domain of the present utility model is defined by the claims.
Claims (4)
1. the stake resistance detection system of power battery pack is characterized in that, is provided with controller and testing circuit, and described testing circuit is provided with analog power (V
S), controlled change-over switch (K), the first resistance (R
A) and the second resistance (R
B), the wherein said first resistance (R
A) be connected in an electrode side of described power battery pack, and via controlled change-over switch (K), analog power (V
S) be connected to earth point, the described second resistance (R
B) be connected in another electrode side of described power battery pack, and be connected directly to described earth point via described controlled change-over switch (K), described controller is connected in described testing circuit, and controls the switching of described controlled change-over switch (K).
2. the stake resistance detection system of power battery pack according to claim 1, it is characterized in that, described controller is a single-chip microcomputer, and being provided with sampling module, control transformation module and computing module, wherein said sampling module is gathered the described first resistance (R in described controlled change-over switch (K) when being in diverse location
A) voltage, the described second resistance (R that locate with the tie point (A) of described power battery pack
B) voltage, the described analog power (V that locate with the tie point (B) of described power battery pack
S) voltage and described power battery pack (V
BAT) voltage, and dwindle by each voltage signal values that subtracter will be gathered, and then carry each voltage signal by the linear optical coupling isolator, described control transformation module receives the voltage signal of described sampling module conveying and voltage signal is carried out analog to digital conversion, and described computing module is to carrying out computing through analog-to-digital signal.
3. the stake resistance detection system of power battery pack according to claim 1 is characterized in that, described analog power (V
S) the amplitude of output voltage amplitude by the voltage of DC-DC isolating transformer and described power battery pack keep synchronous.
4. the stake resistance detection system of power battery pack according to claim 1 is characterized in that, described controller also is connected in display system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205127951U CN201867452U (en) | 2010-08-24 | 2010-08-24 | Grounding resistance detection system for power battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205127951U CN201867452U (en) | 2010-08-24 | 2010-08-24 | Grounding resistance detection system for power battery pack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201867452U true CN201867452U (en) | 2011-06-15 |
Family
ID=44138604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205127951U Expired - Fee Related CN201867452U (en) | 2010-08-24 | 2010-08-24 | Grounding resistance detection system for power battery pack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201867452U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101968513A (en) * | 2010-08-24 | 2011-02-09 | 扬州飞驰动力科技有限公司 | Ground resistance detection system for power battery set |
| CN104569772A (en) * | 2014-12-18 | 2015-04-29 | 北京新能源汽车股份有限公司 | Electric high-voltage direct current insulation detecting circuit and method |
-
2010
- 2010-08-24 CN CN2010205127951U patent/CN201867452U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101968513A (en) * | 2010-08-24 | 2011-02-09 | 扬州飞驰动力科技有限公司 | Ground resistance detection system for power battery set |
| CN104569772A (en) * | 2014-12-18 | 2015-04-29 | 北京新能源汽车股份有限公司 | Electric high-voltage direct current insulation detecting circuit and method |
| CN104569772B (en) * | 2014-12-18 | 2017-11-17 | 北京新能源汽车股份有限公司 | Driven high voltage direct current insulation detecting circuit and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: WANG LIN Free format text: FORMER OWNER: YANGZHOU FEICHI DYNAMIC MECHANISM CO., LTD. Effective date: 20120118 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 225007 YANGZHOU, JIANGSU PROVINCE TO: 225009 YANGZHOU, JIANGSU PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20120118 Address after: 225009 B District, Yangzhou R & D center, 186 middle Yangzi Road, Yangzhou, Jiangsu 206, China Patentee after: Wang Lin Address before: 225007 Jiangsu city of Yangzhou province Guangling Industrial Park Guangling District Genshin Road Patentee before: Yangzhou Feichi Dynamic Mechanism Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110615 Termination date: 20150824 |
|
| EXPY | Termination of patent right or utility model |