The invention relates to a detection method of electric automobile insulating performance. According to the method, a relay 1 and a relay 2 are employed to connect with an anode and a cathode of a direct current bus respectively, voltage division resistors R1 and R1' are in series connection between the relay 1 and a ground (i.e. automobile body), voltage division resistors R2 and R2' are in series connection between the relay 2 and the ground, direct current source 1 injects a direct current signal to a circuit through a diode d1 and a resistor R3, and a direct current source 2 injects a direct current signal to the circuit through a diode D2 and a resistor R4. Four voltage sampling circuits are provided on the R1', R2', R3 and R4 resistors respectively. Through combining the above circuit with specific sampling and calculating steps, insulating performance detection is realized. According to the invention, a method of injecting direct current by a power source is employed to carry out detection, detection precision is high, resistance of the voltage division resistors can be selected to be a large value, influence on vehicle insulating performance in measurement is small, and normal working of an original vehicle system is not interfered.

Detection method of electric automobile insulating performance

The invention relates to an on-line insulated monitoring method for high voltage of an electromobile, which comprises the following steps: 1) at a static state, switch tubes of an inverter are all controlled in an off-state firstly, ground insulation resistances of anode and cathode buses of a direct-current side are detected; 2) an upper or lower switch tube of a certain phase of bridge arm of the inverter is selectively closed to work out the ground insulation resistance of the phase of bus at an alternating-current side; 3) at a dynamic state, the ratios of the voltage to ground to the bus voltage before and after a known-resistance standard resistor is merged between the anode bus and an electromobile body are monitored to respectively extract direct-current components in a filtering method, so that the parallel value of all insulation resistors at the direct-current side and the alternating-current side at the dynamic state is worked out; and the ground insulation fault of any one or a plurality of buses can be obtained through monitoring the parallel value. Compared with the prior art, the method disclosed by the invention has the advantages that the monitoring range at an insulated state is expanded, the insulated state at the direct-current side and the insulated state at the alternating-current side can both be monitored no matter at the static state or at the dynamic state and the like.

On-line insulated monitoring method for high voltage of electromobile

The invention relates to a quick-changing lithium battery box assembly used for a new energy automobile. The quick-changing lithium battery box assembly comprises a mounting box body, a lithium battery, and a battery management system, wherein the lithium battery and the battery management system are both fixedly arranged in the mounting box body; the mounting box body is movably connected with a base, and can slide freely relative to the base; a top cover fixing cover is arranged at the upper part of the mounting box body; a battery box base can freely slide relative to the base through a roller group. Through the adoption of the quick-changing lithium battery box assembly, and a maintenance cover on the surface of the mounting box body, the battery management system inside a detector can be more convenient; ventilation and cooling of the mounting box body are realized through an air outlet and an air inlet, as well as an aspirator which can be started according to the actual temperature of the battery; the lithium battery can be arranged into one layer or two layers according to actual requirement; the size of the mounting box body can be designed according to actual requirement; the battery box assembly can be replaced quickly, and the quick-changing effect can be achieved by the roller group arranged on the base surface.

Quick-changing lithium battery box assembly used for new energy automobile

The invention relates to a battery changing structure. A battery quick-changing structure of a pure electric vehicle comprises a battery cabin shell; a battery accommodating cavity is formed in the battery cabin shell; one end of the battery accommodating cavity is provided with a battery pack inlet; a battery pack locking mechanism is arranged at the battery pack inlet; a battery pack guide positioning mechanism is arranged on at least one of the two sides of the battery pack inlet of the battery accommodating cavity; a battery pack supporting mechanism is arranged at the bottom of the battery accommodating cavity; and a battery pack fastened connection mechanism is arranged at the other end of the battery accommodating cavity. The invention provides the battery quick-changing structure of the pure electric vehicle, which is simple in structure, and can realize rapid changing and mounting of a battery and rapid locking and fixation. The technical problems that in the prior art, the new energy electric vehicle is long in charging time and inconvenient in battery changing are solved.

Battery quick-changing structure of pure electric vehicle

The invention discloses a multipoint electric automobile insulation test system and a detection method thereof. A test system circuit comprises a power battery, a battery voltage sampling circuit, a multichannel voltage switching circuit and isolation amplifier unit, a voltage measuring and controller unit, a multi-monitoring-point switching circuit and an equivalent insulation resistor set for k monitoring points of anode and cathode pairs of a power battery, wherein k is an positive integer larger than or equal to one. The detection method comprises three steps, and the insulation condition of all detection points and the power battery can be acquired respectively through detection and calculation. The multipoint electric automobile insulation test system is simple in circuit and low in cost, and under the AD condition that 12 or more bits are selected, the measuring precision is better than 2.5%. The switching path numbers of monitoring points only need to be increased, the insulation condition of the power battery of an electric automobile to all the monitoring points can be measured randomly, and the traveling safety of the electric automobile can be guaranteed.

Multipoint electric automobile insulation test system and detection method thereof

The invention discloses an insulation detecting method and an insulation detecting device for an electric automobile The insulation resistance of the whole vehicle is detected by combining the resistance voltage dividing method with the cycle detection method, and the whole detecting device comprises an analog quantity acquisition part and a relay array switching part, wherein a detect switch is arranged between the analog quantity acquisition part and the relay array switching part; when the switch is closed, the insulation detecting starts; the left side of the relay array switching part is connected with an electrical system corresponding to relay arrays, each array of the relay array switching part is provided with a changeover switch respectively; by switching corresponding changeover switches, the detecting device can judge and position the specific electric leakage point, and then calculate the insulation resistance of the point through corresponding algorithm The method and the device have the advantages of adopting the resistance voltage dividing method and the cycle detection method to detect the insulation resistance of the whole vehicle, and having the characteristics of stable performance, no alternating-current signal injected into the system, long service life, and capability of positioning the insulation fault point and the like

Insulation detecting method and device for electric automobile

An extractable type device for the quick change of a battery box of a trackless trolley car comprises an installation fixing bracket, a battery box and a locking slanting wedge, V-shaped angle steel is mounted in proper positions on two sides of the battery box body, and chamfer angles can play a guiding role when the battery box is pushed in the installation fixing bracket; caster wheels are arranged at the bottom of the installation fixing bracket; V-shaped insulating material pulleys are mounted on two sides of the installation fixing bracket; the two groups of pulleys can lead the battery box to conveniently slide in the installation fixing bracket, and the V-shaped pulleys can position the battery box in the vertical direction reliably; the caster wheels and the pulleys are made of insulating material, so that insulating protection is realized at the contact part between the battery box body and the installation fixing bracket; and the device is provided with the locking slanting wedge mounted at the bottom of the installation fixing bracket, and a spring below the locking slide wedge can jack the locking slanting wedge up when the battery box is well located, so as to lock and position the battery box.

Extractable type device for quick change of battery box of trackless trolley car

The invention discloses a method and a device for installing a battery box of a trolley bus. A sliding installation mode with rollers is adopted; the bottom part and the side surface of a battery box installing frame are respectively provided with casters and side rollers, so that when the battery box is placed in the battery box installing frame, the outer wall of the battery box is contacted with the casters arranged at the bottom part in the battery box installing frame and the side surface, and the sliding with the rollers is realized by the casters arranged at the bottom part in the battery box installing frame and the side rollers at the side surface; simultaneously the lower bottom edge of a pushing port of the battery box installing frame is provided with an automatic locking device; and when the battery box is installed in place, the automatic locking device arranged at the lower bottom edge of the pushing port of the battery box installing frame is automatically bounced up to lock and position the battery box. The two sides of the battery box are provided with guide strips, the installing positions of the guide strips are matched with the positions of the side rollers at the side surface of the battery box installing frame, so that the condition that when the battery box is pushed into the battery box installing frame, the guide strips at the inner sides of the side rollers are just matched with the side rollers for side positioning is ensured.

Method and device for installing battery box of trolley bus

An insulation testing device for an electric automobile comprises an analog quantity collection part and a relay array switching part A switch is arranged between the analog quantity collection part and the relay array switching part; a to-be-tested electrical system is arranged on the left side of the relay array switching part corresponding to the relay array; and each array of the relay array switching part is provided with a switching switch The analog quantity collection part comprises a main resistor and a sub-resistor, which have different resistances and are in series connection Information collection points are arranged at the two ends of the main resistor, and one end of the main resistor is connected with an automobile body; and a virtual insulation resistor (ie to-be-tested insulation resistor) is arranged between the automobile body and the electrical system The insulation testing device provided by the utility model adopts resistance voltage division method and circular testing method to test the insulation resistance of the entire automobile, can locate insulation fault points, and has the characteristics of stable performance, no alternating current signal injection system, long service life, and so on

Insulation testing device for electric automobile

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Insulation detecting method and device for electric automobile

Extractable type device for quick change of battery box of trackless trolley car

Method and device for installing battery box of trolley bus

Insulation testing device for electric automobile