Anti-reverse-connection electric cabinet of thermal management system

Abstract

The utility model relates to an anti-reverse-connection electric cabinet of a thermal management system. A high-voltage cathode of a DC-DC module, a high-voltage cathode of a compressor and a high-voltage cathode of a high-voltage input module are connected together; a high-voltage positive electrode of the high-voltage input module is connected to the main contactor, the main contactor is connected with the pre-charging contactor, the main contactor comprises a main contactor coil and a main contactor action switch, and the pre-charging contactor comprises a pre-charging contactor coil and a pre-charging contactor action switch. A first contact of the main contactor action switch is connected with a first contact of the pre-charging contactor action switch, and a second contact of the main contactor action switch is connected to a second contact of the pre-charging contactor action switch in series through a high-voltage diode and a pre-charging resistor; the pre-charging resistor is further connected with a pre-charging capacitor in parallel, and the pre-charging capacitor is arranged at the high-voltage positive electrode and the high-voltage negative electrode of the compressor in parallel. According to the utility model, the anti-reverse connection function is added in the pre-charging circuit of the compressor, the working time of the anti-reverse connection diode is short, the fault rate is low, and the safety is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of new energy automobile battery management, concretely relates to a heat management system anti-reverse connection electric cabinet. BACKGROUND

[0002] The heat management system unit demand increases with the increase of demand of passenger cars and trucks, light trucks and heavy trucks in new energy commercial vehicles, and the high voltage input positive and negative reverse connection of the conventional electric cabinet leads to high product failure rate, high maintenance cost, and safety problems in more serious cases.

[0003] The existing electric cabinet is generally:

[0004] 1) without anti-reverse connection function:

[0005] The vehicle high voltage input electric cabinet, the electric cabinet main contactor is attracted, the power supply DC-DC module, and the compressor pre-charge circuit is pre-charged for the compressor, the pre-charge capacitor voltage reaches the rated working voltage of the compressor, the pre-charge contactor is attracted, the pre-charge circuit is short-circuited and stops working, the vehicle high voltage directly powers the compressor, and the unit runs normally.

[0006] 2) with anti-reverse connection function: anti-reverse connection high voltage diode plus non-compressor pre-charge circuit, anti-reverse connection high voltage diode works for a long time, is easy to be damaged, and improves the product failure rate and maintenance cost.

[0007] The conventional electric cabinet has the following problems:

[0008] 1. No anti-reverse connection function, high product failure rate, high maintenance cost, and safety problems of the product;

[0009] 2. Anti-reverse connection high voltage diode plus non-compressor pre-charge circuit, anti-reverse connection high voltage diode works for a long time, is easy to be damaged, and improves the product failure rate and maintenance cost. INVENTION CONTENTS

[0010] The technical problem to be solved by the utility model is:

[0011] 1. Solve the problem of damage of the compressor, DC module and other parts when the positive and negative poles of the high voltage input power source are connected reversely;

[0012] 2. Solve the problem of breakdown, short circuit and fire of electrical components when the positive and negative poles of the high voltage input power source are connected reversely, causing safety problems.

[0013] 3. High voltage diode is added to the compressor pre-charge circuit to avoid damage of the high voltage diode due to long time power-on.

[0014] To solve the above problems, the utility model is realized by the following technical scheme:

[0015] The utility model provides a heat management system anti -reversal electric cabinet, including DC -DC module, compressor and high voltage input module, wherein, DC -DC module high voltage negative pole, compressor high voltage negative pole and high voltage input module high voltage negative pole are connected together, high voltage positive pole of high voltage input module is connected to main contactor, main contactor connects pre -charge contactor, and main contactor includes main contactor coil and main contactor action switch, and pre -charge contactor includes pre -charge contactor coil and pre -charge contactor action switch, wherein, main contactor action switch first contact point connects pre -charge contactor action switch first contact point, and main contactor action switch second contact point is connected to pre -charge contactor action switch second contact point through high voltage diode and pre -charge resistance series connection, and the pre -charge resistance still has pre -charge electric capacity in parallel connection, and pre -charge electric capacity is arranged in parallel in the high voltage positive pole and negative pole of compressor.

[0016] The high voltage positive pole end of the DC-DC module is connected with a second high voltage fuse, and the other end of the second high voltage fuse is connected to the pre-charge contactor.

[0017] The high voltage positive pole end of the compressor is connected with a first high voltage fuse, and the other end of the first high voltage fuse is connected in series with the pre-charge electric capacity.

[0018] The pre-charge electric capacity is composed of at least two pre-charge electric capacities in parallel.

[0019] Compared with the prior art, the utility model has the following beneficial effects: the utility model adds the anti-reversal function in the compressor pre-charge circuit, the anti-reversal diode has a short working time and a low failure rate, solves the problem of damage of the compressor, the DC module and other components when the high voltage input power positive and negative poles are reversed, and improves the safety. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the circuit schematic diagram of the utility model;

[0021] Figure 2 It is the appearance drawing of the utility model. DETAILED DESCRIPTION

[0022] The technical scheme in the embodiments of the utility model will be described clearly and completely in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model.

[0023] In the description of the utility model, it is understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and thus cannot be understood as limiting the utility model.

[0024] As shown in Figure 1 A kind of thermal management system anti-reverse connection electric cabinet, including DC-DC module, compressor and high voltage input module, wherein, DC-DC module high voltage negative pole, compressor high voltage negative pole and high voltage input module high voltage negative pole are connected together;High voltage positive pole of high voltage input module is connected to main contactor 3, main contactor 3 connects pre-charging contactor 4, main contactor 3 includes main contactor coil 1K and main contactor action switch, pre-charging contactor 4 includes pre-charging contactor coil 2K and pre-charging contactor action switch, wherein, main contactor action switch first contact connects pre-charging contactor action switch first contact, main contactor action switch second contact is connected to pre-charging contactor action switch second contact by high voltage diode 6 and pre-charging resistance 5 in series;And the pre-charging resistance 5 is also connected with pre-charging capacitor 1 in parallel, pre-charging capacitor 1 is arranged in parallel at the high voltage positive pole and negative pole of compressor.

[0025] Further, the high voltage positive pole end of DC-DC module is connected with second high voltage fuse 7, and the other end of second high voltage fuse 7 is connected to pre-charging contactor 4.

[0026] Further, the high voltage positive pole end of compressor is connected with first high voltage fuse 2, and the other end of first high voltage fuse 2 is connected in series with pre-charging capacitor 1.

[0027] Better, pre-charging capacitor 1 can be composed of at least two pre-charging capacitors in parallel.

[0028] The working principle of the utility model is:

[0029] 1) compressor pre-charging stage:

[0030] High voltage input is output through high voltage input module, main contactor 3 is attracted, high voltage electricity passes through high voltage diode 6, and then pre-charging resistance 5 carries out voltage drop process, and then enters pre-charging capacitor 1, pre-charging capacitor 1 carries out charging, until the voltage of pre-charging capacitor 1 reaches the rated working voltage range of compressor;When high voltage input positive pole and negative pole are connected reversely, high voltage diode 6 plays a role of cut-off, pre-charging capacitor 1 cannot be charged, and cannot reach the rated working voltage range of compressor, and compressor does not start and feedbacks fault phenomenon.

[0031] 2) compressor and DC module power supply stage

[0032] After the completion of stage 1), the pre-charge contactor 4 is attracted, and the high voltage input supplies normal voltage to the compressor and the DC-DC module.

[0033] Therefore, the anti-reverse connection function is added in the compressor pre-charge circuit, the anti-reverse connection diode has a short working time and a low failure rate; moreover, the anti-reverse connection function is added in the compressor pre-charge circuit, and when the thermal management system unit operates, the anti-reverse connection high-voltage diode in the compressor pre-charge circuit only works for 5-10 seconds, and does not work after the completion of the pre-charge stage.

[0034] The preferred embodiments of the utility model are described above, and it should be noted that for those skilled in the art, without departing from the overall concept of the utility model, some changes and improvements can be made, and these should be considered as the protection scope of the utility model.

Claims

1. A thermal management system anti-reverse connection electrical control box, characterized by: The application relates to a high-voltage charging system for a high-voltage compressor, which comprises a DC-DC module, a compressor and a high-voltage input module, wherein the high-voltage negative pole of the DC-DC module, the high-voltage negative pole of the compressor and the high-voltage negative pole of the high-voltage input module are connected together; the high-voltage positive pole of the high-voltage input module is connected to a main contactor (3), the main contactor (3) is connected to a pre-charge contactor (4), the main contactor (3) comprises a main contactor coil (1K) and a main contactor action switch, the pre-charge contactor (4) comprises a pre-charge contactor coil (2K) and a pre-charge contactor action switch, wherein the first contact of the main contactor action switch is connected to the first contact of the pre-charge contactor action switch, the second contact of the main contactor action switch is connected to the second contact of the pre-charge contactor action switch in series through a high-voltage diode (6) and a pre-charge resistor (5); and the pre-charge resistor (5) is further connected in parallel with a pre-charge capacitor (1), and the pre-charge capacitor (1) is arranged in parallel across the high-voltage positive pole and the high-voltage negative pole of the compressor.

2. The anti-reverse connection electric control box of a thermal management system according to claim 1, characterized in that: The high-voltage positive pole end of the DC-DC module is connected with a second high-voltage fuse (7), and the other end of the second high-voltage fuse (7) is connected to the pre-charge contactor (4).

3. The electric control box of claim 1, wherein: The high-voltage positive pole end of the compressor is connected with a first high-voltage fuse (2), and the other end of the first high-voltage fuse (2) is connected in series with the pre-charge capacitor (1).

4. The electric control box of claim 1, wherein: The pre-charge capacitor (1) is composed of at least two pre-charge capacitors in parallel.

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