CN110568366A - Insulation circuit, battery pack leakage detection method and hardware detection method - Google Patents

Insulation circuit, battery pack leakage detection method and hardware detection method Download PDF

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Publication number
CN110568366A
CN110568366A CN201810569972.0A CN201810569972A CN110568366A CN 110568366 A CN110568366 A CN 110568366A CN 201810569972 A CN201810569972 A CN 201810569972A CN 110568366 A CN110568366 A CN 110568366A
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resistor
battery
sampling
battery pack
switch
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CN110568366B (en
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陈建豪
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Guangzhou Xiaopeng Motors Technology Co Ltd
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Guangzhou Xiaopeng Motors Technology Co Ltd
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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
    • G01R31/28—Testing of electronic circuits, e.g. by signal tracer
    • G01R31/2832—Specific tests of electronic circuits not provided for elsewhere
    • G01R31/2836—Fault-finding or characterising
    • G01R31/2843—In-circuit-testing
    • 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

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention relates to the technical field of batteries, in particular to an insulation circuit, a battery pack leakage detection method and a hardware detection method. The method comprises the following steps: when the main positive relay, the pre-charging relay, the first switch and the second switch are disconnected, acquiring sampling voltage values at two ends of a second sampling resistor; calculating a short-circuit voltage value of the battery pack based on the sampling voltage value, the resistance value of the second sampling resistor and the resistance value of the second resistor, wherein the battery pack is formed by connecting a plurality of batteries in series; and determining the leaked battery in the battery pack based on the short-circuit voltage value, the connection sequence of each battery in the battery pack and the voltage value of each battery. Controlling a main positive relay and a pre-charging relay to enable the main positive relay to be in a closed state; when the first switch and the second switch are disconnected, sampling voltage values at two ends of the first sampling resistor and the second sampling resistor are respectively obtained; and judging whether the hardware of the insulating circuit is abnormal or not based on the resistance values of the first sampling resistor and the second sampling resistor, the sampling voltage value and the voltage value of the battery pack.

Description

Insulation circuit, battery pack leakage detection method and hardware detection method
Technical Field
The invention relates to the technical field of batteries, in particular to an insulation circuit, a battery pack leakage detection method and a hardware detection method.
background
With the continuous development of battery technology, the types of batteries are more and more, and the application of the batteries in the field of energy storage is more and more extensive. At present, the new energy industry develops rapidly, and a new energy automobile based on a power battery pack as an energy source is a popular development direction of various automobile manufacturers at home and abroad, and is actively and continuously developed and strives to solve various problems of the power battery pack in application. The safety and reliability of the power battery as a core energy storage component are always the focus of attention. The voltage value of the power battery pack for the vehicle is generally above 300V, the discharging capacity is extremely high, if the insulation failure of the battery pack and a vehicle body part occurs and other effective detection and protection measures do not exist, the dangerous conditions such as accidental short circuit, electric shock of a human body and the like are very easy to occur, and great damage can be caused to a driver and passengers.
Based on the national standard insulation circuit, the insulation sampling line in the prior art is connected to the positive end and the negative end of the battery, the leakage resistance is directly calculated, the specific fault of the middle leakage of the battery pack cannot be detected, namely the specific leakage point in the battery pack cannot be detected, and the detection of hardware in the insulation circuit cannot be realized. Although some manufacturers have proposed some methods for detecting specific faults of the battery pack middle leakage, the detection process is complex and the detection cost is high.
Disclosure of Invention
The embodiment of the invention aims to provide an insulating circuit, a battery pack leakage detection method and a hardware detection method, which are used for solving the problems that the specific leakage point in a battery pack cannot be detected and the hardware in the insulating circuit cannot be detected in the prior art.
The specific technical scheme provided in the embodiment of the invention is as follows:
In a first aspect, the present invention provides an insulation circuit comprising a main positive relay, a pre-charge resistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a first sampling resistor, a second sampling resistor, a first switch and a second switch, wherein,
The first end of the main positive relay is connected with the first end of the pre-charging relay and the positive end of the battery pack, the second end of the pre-charging relay is connected with the first end of the pre-charging resistor, the second end of the main positive relay is connected with the second end of the pre-charging resistor, the first end of the first resistor is connected with the first end of the third resistor, the second end of the first resistor is connected with the first end of the first sampling resistor, a second end of the third resistor is connected with a first end of the first switch, a second end of the first sampling resistor is connected with a second end of the first switch, the first end of the second resistor, the first end of the fourth resistor and the vehicle body ground are connected, the second end of the second resistor is connected with the first end of the second sampling resistor, and the second end of the fourth resistor is connected with the first end of the second switch, and the second end of the second switch is connected with the second end of the second sampling resistor and the negative end of the battery pack.
Optionally, the resistance of the first resistor is equal to the resistance of the second resistor, the resistance of the first sampling resistor is equal to the resistance of the second sampling resistor, and the resistance of the third resistor is equal to the resistance of the fourth resistor.
Optionally, the first switch and the second switch are MOS transistors.
In a second aspect, the present invention provides a battery leakage detection method based on the insulation circuit in the first aspect, including:
When the main positive relay, the pre-charging relay, the first switch and the second switch are disconnected, acquiring sampling voltage values at two ends of a second sampling resistor;
Calculating a short-circuit voltage value of a battery pack based on the sampling voltage value, the resistance value of the second sampling resistor and the resistance value of the second resistor, wherein the battery pack is formed by connecting a plurality of batteries in series;
and determining the batteries with electric leakage in the battery pack based on the short-circuit voltage value, the connection sequence of the batteries in the battery pack and the voltage value of each battery.
By adopting the battery pack leakage detection method provided by the invention, the position of the leaked battery in the battery pack can be determined according to the determined battery pack leakage voltage value, the voltage value and the connection sequence of each battery in the battery pack.
Optionally, determining a battery with leakage in the battery pack based on the short-circuit voltage value, the connection sequence of the batteries in the battery pack, and the voltage value of each battery, includes:
Respectively determining the voltage value of each battery and the negative terminal of the battery pack according to the connection sequence of each battery in the battery pack and the voltage value of each battery;
And determining the batteries with electric leakage in the battery pack according to the short-circuit voltage and the voltage values of the batteries and the negative terminal of the batteries.
The above optional implementation manner is characterized in that a specific manner of determining a battery with leakage in the battery pack is determined according to the determined short-circuit voltage and the voltage values of each battery in the battery pack and the negative terminal of the battery.
Optionally, determining a battery with leakage in the battery pack according to the short-circuit voltage and the voltage value of the battery negative terminal, including:
And determining the batteries with the difference value between the voltage value of each battery and the negative end of the battery pack and the short-circuit voltage being less than or equal to a first threshold value as the batteries with electric leakage.
The above optional implementation manner is characterized in that a leaky battery in the battery pack is determined by specifically determining whether a difference between a voltage value of each battery in the battery pack and a negative terminal of the battery pack and the determined short-circuit voltage is less than or equal to a first threshold.
In a third aspect, the present invention provides a hardware detection method based on the insulation circuit in the first aspect, where a leakage resistor is connected to the insulation circuit, a resistance value of the first resistor is equal to a resistance value of the second resistor, and a resistance value of the first sampling resistor is equal to a resistance value of the second sampling resistor, and the method includes:
controlling a main positive relay and a pre-charging relay to complete electrification, wherein the main positive relay is in a closed state after electrification is completed;
When the first switch and the second switch are disconnected, sampling voltage values at two ends of the first sampling resistor and the second sampling resistor are respectively obtained;
And judging whether the insulating circuit hardware is abnormal or not based on the resistance values of the first sampling resistor and the second sampling resistor, the sampling voltage value and the voltage value of the battery pack.
By adopting the hardware detection method provided by the invention, whether the hardware in the insulating circuit is abnormal or not can be judged according to the acquired sampling voltage value and the resistance value of the sampling resistor by switching the working conditions of the first switch and/or the second switch.
Optionally, based on the resistance values of the first sampling resistor and the second sampling resistor, the sampling voltage value and the voltage value of the battery pack, determining whether the insulating circuit hardware is abnormal includes:
Calculation of (R)1/RSample 1+1)×(USample 1+USample 2) And UBattery with a battery cellA difference value of where R1Is a first resistance, RSample 1Is a first sampling resistor, Usample 1Is a first sampled voltage value, USample 2Is a second sampled voltage value, UBattery with a battery cellThe voltage value of the battery pack;
At the judgment of (R)1/RSample 1+1)×(USample 1+USample 2) And UBattery with a battery cellAnd when the difference value is less than or equal to a second threshold value, determining that the line and the resistance of the insulation circuit are normal.
The above alternative embodiment features a specific detection mode for determining whether the lines and resistances of the isolated circuit are normal.
Optionally, the method further comprises:
And closing or opening the first switch/the second switch, and determining that the corresponding switch is normal when the variation of the sampling voltage values at the two ends of the first sampling resistor and the second sampling resistor is judged to be larger than or equal to a third threshold value.
The above optional embodiment is characterized in that whether the switch executing the switching action is normal or not can be determined by switching the working state of the first switch/the second switch and judging whether the variation of the acquired sampling voltage value is greater than or equal to the set threshold.
Optionally, closing or opening the first switch/the second switch, and determining that the corresponding switch is normal when it is determined that a variation of the sampled voltage values at the two ends of the first sampling resistor and the second sampling resistor is greater than or equal to a third threshold, including:
If the resistance between the negative end of the battery pack and the vehicle body ground is smaller than the resistance between the output end of the main positive relay and the vehicle body ground, the first switch is closed/opened, and when the change quantity of the sampling voltage values at the two ends of the first sampling resistor and the second sampling resistor is judged to be larger than or equal to a third threshold value, the first switch is determined to be normally closed/opened;
And if the resistance between the negative end of the battery pack and the vehicle body ground is larger than or equal to the resistance between the output end of the main positive relay and the vehicle body ground, the second switch is closed/opened normally when the change quantity of the sampling voltage values at the two ends of the first sampling resistor and the second sampling resistor is judged to be larger than or equal to a third threshold value.
The invention has the following beneficial effects:
In summary, in the embodiments of the present invention, an insulation circuit, a method for battery leakage detection based on the insulation circuit, and a method for hardware detection based on the insulation circuit are provided, where the insulation circuit includes a main positive relay, a pre-charge resistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a first sampling resistor, a second sampling resistor, a first switch, and a second switch, a first end of the main positive relay is connected to a first end of the pre-charge relay and a positive end of a battery pack, a second end of the pre-charge relay is connected to a first end of the pre-charge resistor, a second end of the main positive relay is connected to a second end of the pre-charge resistor, the first resistor is connected to a first end of the third resistor, and a second end of the first resistor is connected to a first end of the first sampling resistor, the second end of the third resistor is connected with the first end of the first switch, the second end of the first sampling resistor is connected with the second end of the first switch, the first end of the second resistor, the first end of the fourth resistor and the vehicle body ground, the second end of the second resistor is connected with the first end of the second sampling resistor, the second end of the fourth resistor is connected with the first end of the second switch, and the second end of the second switch is connected with the second end of the second sampling resistor and the negative end of the battery pack.
When the insulating circuit provided by the invention is adopted to carry out the leakage detection of the battery pack, the position of a leaked battery in the battery pack can be accurately judged, and when the insulating circuit provided by the invention is adopted to carry out the hardware detection, whether a line and a resistor in the insulating circuit are damaged or not can be accurately detected, and whether the corresponding first switch/second switch works normally or not can also be detected.
Drawings
FIG. 1 is a schematic circuit diagram of an isolation circuit provided in an embodiment of the present invention;
Fig. 2 is a detailed flowchart of a battery leakage detection method according to an embodiment of the present invention;
FIG. 3 is a detailed flowchart of a hardware detection method provided in an embodiment of the present invention;
Fig. 4a to fig. 4c are schematic circuit diagrams of the leakage resistor access isolation circuit provided in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
First, the term "and" in the embodiment of the present invention is only one kind of association relationship describing an associated object, and indicates that three relationships may exist, for example, a and B may indicate: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
when the invention is referred to as "first", "second", "third" or "fourth", etc., ordinal terms, it should be understood that they are used for distinguishing only if they are actually used to express the order in context.
The scheme of the present invention will be described in detail by way of specific examples, but the present invention is not limited to the following examples.
Illustratively, referring to FIG. 1, the present invention provides an isolation circuit including a main positive relay K1Pre-charge relay K2Pre-charging resistor RPre-chargingfirst resistance R1A second resistance R2third resistor R3Fourth resistor R4First sampling resistor RSample 1Second sampling resistor RSample 2First switch K3And a second switch K4Wherein, a main positive relay K1First terminal and pre-charge relay K2is connected with the positive end of the battery pack, and a pre-charging relay K2Second terminal and pre-charging resistor RPre-chargingIs connected with the first end of the main positive relay K1second terminal and pre-charging resistor RPre-charginga second terminal of (1), a first resistor R1And a third resistor R3Is connected to a first terminal of a first resistor R1Second terminal and first sampling resistor RSample 1is connected to a first terminal of a third resistor R3Second terminal and first switch K3Is connected to a first terminal of a first sampling resistor RSample 1Second terminal and first switch K3a second terminal of (1), a second resistor R2a first terminal of (1), a fourth resistor R4is connected to the vehicle body ground, and a second resistor R2Second terminal and second sampling resistor RSample 2Is connected to a fourth resistor R4Second terminal and second switch K4is connected to a first terminal of a second switch K4Second terminal and second sampling resistor Rsample 2Is connected to the negative terminal of the battery pack.
Preferably, in an embodiment of the present invention, a preferred implementation manner is that the first resistor R is a resistor1is equal to the second resistor R2The resistance value of (1), the first sampling resistor RSample 1Is equal to the second sampling resistor RSampling2Of the third resistor R3Is equal to the fourth resistor R4The resistance value of (c).
Preferably, in an embodiment of the present invention, a preferred implementation manner is that the first switch K is a switch3And a second switch K4Is an MOS tube.
For example, referring to fig. 2, in an embodiment of the present invention, a detailed flow of a battery leakage detection method based on the above-mentioned insulation circuit is as follows:
Step 200: and when the main positive relay, the pre-charging relay, the first switch and the second switch are disconnected, acquiring the sampling voltage values at two ends of the second sampling resistor.
Specifically, in the embodiment of the present invention, as is apparent from the circuit connection of the insulating circuit, when both the main positive relay and the precharge relay are in the off state, the insulating circuit is open, and if the battery pack leaks electricity, it is indicated that the positive electrode of any one of the batteries in the battery pack is connected to the vehicle body ground, and at this time, a path is formed between the vehicle body ground and the negative terminal of the battery pack, and then, the short-circuit voltage value (i.e., the leakage voltage value) of the battery pack can be calculated by sampling the voltage value of the sampled voltage in the loop between the negative terminal of the battery pack and the vehicle body ground.
In practical application, the requirements for the sampling voltage value in the insulation circuit are as follows: if the sampling voltage value is less than or equal to 5V, a sampling resistor with a smaller resistance value needs to be set, whereas if the voltage value of a general vehicle battery is higher (greater than or equal to 300V), a resistor with a larger resistance value needs to be connected in series on a loop where the sampling resistor is located to divide the voltage. For example, in the insulation circuit provided in the embodiment of the present invention, the first sampling resistor RSample 1And a first resistor R1Series, second sampling resistor RSample 2And a second resistor R2Are connected in series.
Step 210: and calculating a short-circuit voltage value of the battery pack based on the sampling voltage value, the resistance value of the second sampling resistor and the resistance value of the second resistor, wherein the battery pack is formed by connecting a plurality of batteries in series.
for example, assume that the resistance value of the second sampling resistor is RSample 2Across the second sampling resistorSampling voltage value is VSample 2The resistance value of the second resistor is R2Then, can be based on RSample 2，USample 2And R2Calculating the leakage voltage value U of the battery packLeakage of electricitySpecifically, ULeakage of electricity＝USample 2×(R2+RSample 2)/RSample 2。
In practical application, the battery pack may be formed by connecting a plurality of batteries in series, that is, the battery pack may include battery 1, battery 2, battery 3, … …, battery n, n is a positive integer greater than or equal to 2, the voltage values of the batteries in the battery pack may be the same or different, and the voltage value of the battery pack is the sum of the voltage values of the batteries forming the battery pack.
Step 220: and determining the leaked battery in the battery pack based on the short-circuit voltage value, the connection sequence of the batteries in the battery pack and the voltage value of each battery.
Specifically, in the embodiment of the present invention, in step 220, the voltage values of the batteries and the negative terminal of the battery pack are respectively determined according to the connection order of the batteries in the battery pack and the voltage values of the batteries; and determining the batteries with electric leakage in the battery pack according to the short-circuit voltage and the voltage values of the batteries and the negative terminal of the batteries.
further, in an embodiment of the present invention, the specific step of determining the leaky battery in the battery pack according to the short-circuit voltage and the voltage value of the negative terminal of the battery includes: and determining the batteries with the difference value between the voltage value of each battery and the negative end of the battery pack and the short-circuit voltage being less than or equal to a first threshold as the batteries with leakage.
For example, if the battery pack is composed of a battery 1, a battery 2 and a battery 3 connected in series, the negative terminal of the battery 1 is the negative terminal of the battery pack, the positive terminal of the battery 1 is connected to the negative terminal of the battery 2, the positive terminal of the battery 2 is connected to the negative terminal of the battery 3, and the positive terminal of the battery 3 is the positive terminal of the battery pack, then, if the voltage value of the battery 1 is 5V, the voltage value of the battery 2 is 10V, and the voltage value of the battery 3 is 15V, then, normally, the voltage value of the battery pack is 30V, when the positive terminal of the battery 1 is connected to the vehicle body ground, i.e. the battery 1 is electrically leaky, then the voltage value between the vehicle body ground and the negative terminal of the battery pack is 5V, when the positive terminal of the battery 2 is connected to the vehicle body ground, then the voltage value between the vehicle body ground and the negative terminal of the battery pack is (5+ 10-15) V, when the positive terminal of the battery 3 is connected to the vehicle body ground, the voltage between the vehicle body ground and the negative terminal of the battery pack is (5+10+15 — 30) V.
As can be seen from the above, in the embodiment of the present invention, in the process of detecting the leakage of the battery pack, firstly, the voltage values between the positive terminal of each battery in the battery pack and the negative terminal of the battery pack are respectively determined according to the voltage values of the batteries in the battery pack and the connection sequence of the batteries, then, according to the sampled voltage values, the resistance value of the second sampling resistor and the resistance value of the second resistor, the calculated short-circuit voltage value of the battery pack is compared with the voltage value between the positive terminal of each battery and the negative terminal of the battery pack, and the battery with the difference between the voltage value of each battery and the negative terminal of the battery pack and the calculated short-circuit voltage value being smaller than or equal to the first threshold is determined as the leakage battery.
For example, assuming that the battery pack includes a battery pack 1, a battery pack 2, and a battery pack 3, the negative terminal of the battery 1 is the negative terminal of the battery pack, the positive terminal of the battery 1 is connected to the negative terminal of the battery 2, the positive terminal of the battery 2 is connected to the negative terminal of the battery 3, the positive terminal of the battery 3 is the positive terminal of the battery pack, the voltage value of the battery 1 is 5V, the voltage value of the battery 2 is 10V, the voltage value of the battery 3 is 15V, and the first threshold value is 1V, then the voltage value between the positive terminal of the battery 1 and the negative terminal of the battery pack is 5V, the voltage value between the positive terminal of the battery 2 and the negative terminal of the battery pack is 15V, the voltage value between the positive terminal of the battery 3 and the negative terminal of the battery pack is 30V, if the calculated leakage voltage of the battery pack is 4, the positive terminal leakage of cell 1 in the battery pack can be determined and if the calculated leakage voltage of the battery pack is 29V, the positive terminal leakage of cell 3 in the battery pack can be determined.
By adopting the battery pack leakage detection method provided by the invention, the specific leakage position in the battery pack formed by connecting a plurality of battery packs in series can be determined according to the calculated leakage voltage value.
Of course, the specific setting of the second threshold may be correspondingly set according to different application scenarios and/or different user requirements, and in the embodiment of the present invention, no specific limitation is made herein.
In addition, the invention also provides a hardware detection method based on the insulation circuit, wherein the insulation circuit is connected with a leakage resistor, the resistance value of the first resistor in the insulation circuit is equal to the resistance value of the second resistor, and the resistance value of the first sampling resistor is equal to the resistance value of the second sampling resistor. Exemplarily, referring to fig. 3, a detailed flow of a hardware detection method based on the above-mentioned isolation circuit in an embodiment of the present invention is as follows:
Step 300: and controlling the main positive relay and the pre-charging relay to complete electrification, wherein after electrification is completed, the main positive relay is in a closed state.
In practical application, because the voltage value of the battery pack is high, in order to avoid that the instantaneous current is too high during power-on and damages electrical components in the circuit, the pre-charging relay needs to be closed firstly during power-on operation, and because the pre-charging circuit comprises the pre-charging resistor, the instantaneous current during power-on can be greatly reduced; then, the main positive relay is closed, and the pre-charging relay is opened, so that the power-on is completed.
Step 310: and when the first switch and the second switch are disconnected, the sampling voltage values at two ends of the first sampling resistor and the second sampling resistor are respectively obtained.
Specifically, in the embodiment of the present invention, when the main positive relay is closed and the first switch and the second switch are opened in the insulating circuit, the first sampling voltage value may be obtained by collecting the voltage values at the two ends of the first sampling resistor, and the second sampling voltage value may be obtained by collecting the voltage values at the two ends of the second sampling resistor.
step 320: and judging whether the insulated circuit hardware is abnormal or not based on the resistance values of the first sampling resistor and the second sampling resistor, the sampling voltage value and the voltage value of the battery pack.
Specifically, in the embodiment of the present invention, the specific step of executing step 320 includes: calculation of (R)1/RSample 1+1)×(USample 1+USample 2) And UBattery with a battery cellDifference of value of whichIn, R1Is a first resistance, RSample 1Is a first sampling resistor, USample 1is a first sampled voltage value, USample 2is a second sampled voltage value, UBattery with a battery cellis the voltage value of the battery pack, and is determined as (R)1/RSample 1+1)×(USample 1+USample 2) And UBattery with a battery cellAnd when the difference value is less than or equal to a second threshold value, determining that the line and the resistance of the insulation circuit are normal.
in practical application, the mode of accessing the leakage resistor into the insulation circuit includes any one of the following three conditions:
The first case is: and a leakage resistor is connected between the output end of the main positive relay and the ground of the vehicle body.
for example, referring to fig. 4a, when the main positive relay is closed and the first switch and the second switch are in the open state, it can be deduced from the KCL equation that:
USample 1/Rsample 1×(R1+RSample 1)+USample 2/RSample 2×(R2+RSample 2)＝UBattery with a battery cell，
due to R1＝R2，RSample 1＝RSample 2It is possible to obtain:
USample 1/RSample 1×(R1+RSample 1)+USample 2/RSample 1×(R1+Rsample 1)＝UBattery with a battery cell，
To obtain (R)1+RSample 1)/RSample 1×(USample 1+USample 2)＝UBattery with a battery cell，
Finally obtain (R)1/RSample 1+1)×(Usample 1+USample 2)＝UBattery with a battery cell。
The second case is: a leakage resistor is connected between the negative terminal of the battery pack and the vehicle body ground.
For example, referring to fig. 4b, when the main positive relay is closed and the first switch and the second switch are in the open state, it can be deduced from the KCL equation that:
USample 1/RSample 1×(R1+RSample 1)+USample 2/RSample 2×(R2+Rsample 2)＝UBattery with a battery cell，
Due to R1＝R2，Rsample 1＝RSample 2It is possible to obtain:
USample 1/RSample 1×(R1+RSample 1)+USample 2/RSample 1×(R1+RSample 1)＝UBattery with a battery cell，
To obtain (R)1+RSample 1)/RSample 1×(USample 1+USample 2)＝UBattery with a battery cell，
Finally obtain (R)1/RSample 1+1)×(USample 1+USample 2)＝UBattery with a battery cell。
the third case is: a first leakage resistor is connected between the output end of the main positive relay and the vehicle body ground, and a second leakage resistor is connected between the negative end of the battery pack and the vehicle body ground.
For example, referring to fig. 4c, when the main positive relay is closed and the first switch and the second switch are in the open state, it can be deduced from the KCL equation:
USample 1/RSample 1×(R1+RSample 1)+USample 2/RSample 2×(R2+RSample 2)＝UBattery with a battery cell，
Due to R1＝R2，RSample 1＝RSample 2It is possible to obtain:
USample 1/RSample 1×(R1+RSample 1)+USample 2/Rsample 1×(R1+RSample 1)＝UBattery with a battery cell，
To obtain (R)1+RSample 1)/RSample 1×(USample 1+USample 2)＝UBattery with a battery cell，
Finally obtain (R)1/Rsample 1+1)×(USample 1+USample 2)＝UBattery with a battery cell。
Due to the problem of sampling precision, no matter what form the leakage resistor is connected into the insulation circuit, the leakage resistor is only determined1/RSample 1+1)×(USample 1+USample 2) And UBattery with a battery cellWhen the difference value is less than or equal to the second threshold value, the circuit and the resistor of the insulating circuit can be determined to be normal.
Of course, the specific setting of the second threshold may be correspondingly set according to different application scenarios and/or different user requirements, and in the embodiment of the present invention, no specific limitation is made herein.
Furthermore, in the embodiment of the present invention, when the main positive relay is closed, whether the first switch/the second switch is normal may be determined by closing or opening the first switch/the second switch and determining a change value of the sampled voltage value at two ends of the first sampling resistor and/or the second sampling resistor. Specifically, when it is determined that the variation of the sampled voltage values at both ends of the first sampling resistor and the second sampling resistor is greater than or equal to the third threshold, it is determined that the corresponding switch (the first switch/the second switch) is normal.
Specifically, the step of closing or opening the first switch/the second switch, and determining that the corresponding switch is normal when it is determined that the variation of the sampling voltage values at the two ends of the first sampling resistor and the second sampling resistor is greater than or equal to a third threshold value, includes: if the resistance between the negative end of the battery pack and the vehicle body ground is smaller than the resistance between the output end of the main positive relay and the vehicle body ground, the first switch is closed/opened, and when the change quantity of the sampling voltage values at the two ends of the first sampling resistor and the second sampling resistor is judged to be larger than or equal to a third threshold value, the first switch is determined to be normally closed/opened; and if the resistance between the negative end of the battery pack and the vehicle body ground is larger than or equal to the resistance between the output end of the main positive relay and the vehicle body ground, the second switch is closed/opened normally when the change quantity of the sampling voltage values at the two ends of the first sampling resistor and the second sampling resistor is judged to be larger than or equal to a third threshold value.
In practical application, if a leakage resistor is connected between the negative terminal of the battery pack and the vehicle body ground, and a leakage resistor is not connected between the output terminal of the main positive relay and the vehicle body ground, the resistance value between the negative terminal of the battery pack and the vehicle body ground is smaller than the resistance value between the output terminal of the main positive relay and the vehicle body ground, then, and under the condition that the main positive relay is closed and the first switch and the second switch are opened, acquiring a sampling voltage value 1 at two ends of the first sampling resistor and/or the second sampling resistor, controlling the first switch to be switched from open to closed, acquiring a sampling voltage value 2 at two ends of the first sampling resistor and/or the second sampling resistor again, and determining that the first switch is normally switched from open to closed if the variation of the sampling voltage values at two ends of the first sampling resistor and/or the variation of the sampling voltage values at two ends of the second sampling resistor is larger than or equal to a third threshold value.
If no leakage resistor is connected between the negative end of the battery pack and the vehicle body ground, and a leakage resistor is connected between the output end of the main positive relay and the vehicle body ground, the resistance value between the negative end of the battery pack and the vehicle body ground is larger than the resistance value between the output end of the main positive relay and the vehicle body ground; or if a leakage resistor 1 is connected between the output end of the main positive relay and the vehicle body ground, a leakage resistor 2 is connected between the negative end of the battery pack and the vehicle body ground, and the leakage resistor 1 is equal to the leakage resistor 2, then under the condition that the main positive relay is closed and the first switch and the second switch are opened, obtaining the sampling voltage values 1 at two ends of the first sampling resistor and/or the second sampling resistor, controlling the second switch to be switched from open to closed, obtaining the sampling voltage values 2 at two ends of the first sampling resistor and/or the second sampling resistor again, and if the variation of the sampling voltage values at two ends of the first sampling resistor and/or the variation of the sampling voltage values at two ends of the second sampling resistor are judged to be larger than or equal to a third threshold value, determining that the second switch is switched from open to closed normally.
It can be known from the above that, under the condition that the main positive relay is closed and the first switch and the second switch are opened, if the first switch and/or the second switch is switched from open to closed, the third resistor and/or the fourth resistor is correspondingly connected into the circuit path, at this time, the sampled voltage values at two ends of the first sampling resistor and/or the second sampling resistor change, and if the sampled voltage values at two ends of the first sampling resistor and the second sampling resistor do not change significantly, it can be considered that the switch is not closed when the corresponding switch is closed, and the switch is not opened when the corresponding switch is opened, or the resistance value of the leakage resistor connected into the insulation circuit is small, so as to reach within the insulation fault alarm threshold.
In summary, in the embodiments of the present invention, an insulation circuit, a method for battery leakage detection based on the insulation circuit, and a method for hardware detection based on the insulation circuit are provided, where the insulation circuit includes a main positive relay, a pre-charge resistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a first sampling resistor, a second sampling resistor, a first switch, and a second switch, a first end of the main positive relay is connected to a first end of the pre-charge relay and a positive end of a battery pack, a second end of the pre-charge relay is connected to a first end of the pre-charge resistor, a second end of the main positive relay is connected to a second end of the pre-charge resistor, the first resistor is connected to a first end of the third resistor, and a second end of the first resistor is connected to a first end of the first sampling resistor, the second end of the third resistor is connected with the first end of the first switch, the second end of the first sampling resistor is connected with the second end of the first switch, the first end of the second resistor, the first end of the fourth resistor and the vehicle body ground, the second end of the second resistor is connected with the first end of the second sampling resistor, the second end of the fourth resistor is connected with the first end of the second switch, and the second end of the second switch is connected with the second end of the second sampling resistor and the negative end of the battery pack.
When the insulating circuit provided by the invention is adopted to carry out the leakage detection of the battery pack, the position of a leaked battery in the battery pack can be accurately judged, and when the insulating circuit provided by the invention is adopted to carry out the hardware detection, whether a line and a resistor in the insulating circuit are damaged or not can be accurately detected, and whether the corresponding first switch/second switch works normally or not can also be detected.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described in terms of flowcharts and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.

Claims (10)

1. An insulation circuit, comprising a main positive relay, a pre-charge resistor, a first resistor, a second resistor, a third resistor, a fourth resistor, a first sampling resistor, a second sampling resistor, a first switch and a second switch, wherein,
The first end of the main positive relay is connected with the first end of the pre-charging relay and the positive end of the battery pack, the second end of the pre-charging relay is connected with the first end of the pre-charging resistor, the second end of the main positive relay is connected with the second end of the pre-charging resistor, the first end of the first resistor is connected with the first end of the third resistor, the second end of the first resistor is connected with the first end of the first sampling resistor, a second end of the third resistor is connected with a first end of the first switch, a second end of the first sampling resistor is connected with a second end of the first switch, the first end of the second resistor, the first end of the fourth resistor and the vehicle body ground are connected, the second end of the second resistor is connected with the first end of the second sampling resistor, and the second end of the fourth resistor is connected with the first end of the second switch, and the second end of the second switch is connected with the second end of the second sampling resistor and the negative end of the battery pack.
2. The isolation circuit according to claim 1, wherein the first resistor has a resistance equal to that of the second resistor, the first sampling resistor has a resistance equal to that of the second sampling resistor, and the third resistor has a resistance equal to that of the fourth resistor.
3. The isolation circuit of claim 1, wherein said first and second switches are MOS transistors.
4. A battery leakage detection method based on the insulation circuit according to any one of claims 1 to 3, comprising:
When the main positive relay, the pre-charging relay, the first switch and the second switch are disconnected, acquiring sampling voltage values at two ends of a second sampling resistor;
calculating a short-circuit voltage value of a battery pack based on the sampling voltage value, the resistance value of the second sampling resistor and the resistance value of the second resistor, wherein the battery pack is formed by connecting a plurality of batteries in series;
And determining the batteries with electric leakage in the battery pack based on the short-circuit voltage value, the connection sequence of the batteries in the battery pack and the voltage value of each battery.
5. The method of claim 4, wherein determining a leaky one of the battery packs based on the short circuit voltage value, the connection order of the cells in the battery pack, and the voltage values of the cells comprises:
Respectively determining the voltage value of each battery and the negative terminal of the battery pack according to the connection sequence of each battery in the battery pack and the voltage value of each battery;
And determining the batteries with electric leakage in the battery pack according to the short-circuit voltage and the voltage values of the batteries and the negative terminal of the batteries.
6. The method of claim 5, wherein determining a leaky battery in said battery pack based on said short circuit voltage and said voltage value associated with said negative terminal of said battery comprises:
And determining the batteries with the difference value between the voltage value of each battery and the negative end of the battery pack and the short-circuit voltage being less than or equal to a first threshold value as the batteries with electric leakage.
7. A hardware detection method based on an isolation circuit according to any one of claims 1 to 3, wherein a leakage resistor is connected to the isolation circuit, the resistance of the first resistor is equal to the resistance of the second resistor, and the resistance of the first sampling resistor is equal to the resistance of the second sampling resistor, the method comprising:
controlling a main positive relay and a pre-charging relay to complete electrification, wherein the main positive relay is in a closed state after electrification is completed;
When the first switch and the second switch are disconnected, sampling voltage values at two ends of the first sampling resistor and the second sampling resistor are respectively obtained;
and judging whether the insulating circuit hardware is abnormal or not based on the resistance values of the first sampling resistor and the second sampling resistor, the sampling voltage value and the voltage value of the battery pack.
8. The method of claim 7, wherein determining whether the isolated circuit hardware is abnormal based on the resistance values of the first and second sampling resistors, the sampled voltage value, and the voltage value of the battery pack comprises:
calculation of (R)1/RSample 1+1)×(Usample 1+USample 2) And UBattery with a battery cella difference value of where R1is a first resistance, RSample 1Is a first sampling resistor, USample 1Is a first sampled voltage value, USample 2Is a second sampled voltage value, UBattery with a battery cellThe voltage value of the battery pack;
At the judgment of (R)1/RSample 1+1)×(USample 1+USample 2) And UBattery with a battery cellAnd when the difference value is less than or equal to a second threshold value, determining that the line and the resistance of the insulation circuit are normal.
9. the method of claim 7, further comprising:
And closing or opening the first switch/the second switch, and determining that the corresponding switch is normal when the variation of the sampling voltage values at the two ends of the first sampling resistor and the second sampling resistor is judged to be larger than or equal to a third threshold value.
10. The method of claim 9, wherein closing or opening the first switch/second switch and determining that the corresponding switch is normal when it is determined that a variation in the sampled voltage value across the first and second sampling resistors is equal to or greater than a third threshold value comprises:
if the resistance between the negative end of the battery pack and the vehicle body ground is smaller than the resistance between the output end of the main positive relay and the vehicle body ground, the first switch is closed/opened, and when the change quantity of the sampling voltage values at the two ends of the first sampling resistor and the second sampling resistor is judged to be larger than or equal to a third threshold value, the first switch is determined to be normally closed/opened;
And if the resistance between the negative end of the battery pack and the vehicle body ground is larger than or equal to the resistance between the output end of the main positive relay and the vehicle body ground, the second switch is closed/opened normally when the change quantity of the sampling voltage values at the two ends of the first sampling resistor and the second sampling resistor is judged to be larger than or equal to a third threshold value.
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