Lithium battery charging port anti-electric shock protection device

Abstract

The utility model discloses a lithium battery charging port anti-electric shock protection device, which is characterized in that a diode of which the conduction direction is from a charging port to a lithium battery is connected in series on an anode connecting line between the lithium battery and the charging port, the diode is attached to a heat dissipation block for fixation and heat dissipation, and a box cover for covering the diode is arranged on the heat dissipation block. The lithium battery further comprises a thermistor used for monitoring the temperature of the diodes, the box cover is provided with through holes used for the diodes and thermistor signal lines, and the diode signal lines are connected with the lithium battery and the positive electrode of the charging port through connectors. According to the anti-electric shock protection device, the diode of which the conduction direction is from the charging port to the lithium battery is connected in series on the positive electrode connecting wire between the lithium battery and the charging port, so that the current cannot flow reversely under the condition that an insulating coating or an isolating sealing object of the charging port is damaged, and electric shock is prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery charging port anti -electric shock technology especially relates to a lithium battery charging port anti -electric shock protection device. BACKGROUND

[0002] In some motorcycle lithium battery product designs, the positive control MOS tube on the battery management system (BMS) board is usually normally closed design, and the positive and negative poles of the lithium battery are always kept in communication through the MOS tube, so as to continuously output voltage. Although this design simplifies the circuit structure, it also brings a series of problems. Because the positive and negative poles of the lithium battery have voltage output all the time, the vehicle-mounted charging port is in an electrified state for a long time, and when the insulating covering or isolation seal on the charging port is intact, no safety problem will be caused. However, in the actual use process, these insulating materials may fail due to wear, aging, external damage and other reasons. Once the insulating covering or isolation seal on the charging port is damaged, the long-term output voltage may leak through the damaged part, posing an electric shock risk. SUMMARY

[0003] The utility model aims at providing a lithium battery charging port anti -electric shock protection device, which ensures that the current direction on the positive connection line between the lithium battery and the charging port is always from the charging port to the storage battery, effectively preventing electric shock risk.

[0004] Technical scheme: To achieve the above-mentioned purpose, a lithium battery charging port anti -electric shock protection device is provided, which has a diode with a conduction direction from the charging port to the lithium battery connected in series on the positive connection line between the lithium battery and the charging port. The diode is attached to the heat sink for fixation and heat dissipation, and the heat sink is provided with a box cover for covering the diode.

[0005] Among them, the heat sink is a block structure stretched from aluminum material.

[0006] Among them, the front surface of the heat sink is a smooth surface attached with the diode, and the back surface is provided with a plurality of heat dissipation fins.

[0007] Among them, the diode and the heat sink are connected by a layer of silicone grease.

[0008] Among them, it also includes a thermistor for monitoring the temperature of the diode.

[0009] Among them, the box cover is provided with a perforation for the diode and the thermistor signal line, and the diode signal line is connected to the lithium battery and the charging port positive pole through a connector.

[0010] Among them, the box cover and the heat sink are fixed by sealing glue, buckle structure or screw.

[0011] Beneficial effects: the utility model has the following advantages: 1, by the series connection of the diode of the positive connection line between lithium battery and charging port, the diode is in the direction of charging port to lithium battery, ensures that current cannot flow reversely in the case of charging port insulation covering or isolation seal damage, prevents the risk of electric shock;2, the heat dissipation block and the box cover design not only effectively dissipate heat for the diode, but also play the fixing and protection role;3, the thermistor can monitor the temperature condition of the diode in real time, and can adjust the working state of the charger in real time according to the temperature information, protects the normal operation of the whole vehicle charging circuit, prevents overheating damage. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is the schematic diagram of the existing electric motorcycle charging circuit;

[0013] Figure 2 It is based on Figure 1 Add diode schematic diagram;

[0014] Figure 3 It is the structure schematic diagram of the device. DETAILED DESCRIPTION

[0015] The technical scheme of the utility model will be described in detail below in combination with the embodiments and drawings.

[0016] As Figure 1 Shown, it is the existing electric motorcycle charging circuit, the positive and negative poles of lithium battery are connected with the positive and negative poles of charging port, the device adds diode on the positive connection line between lithium battery and charging port, limits the positive two-way circuit into the specified one-way circuit, so that even in the case of charging port insulation covering or isolation seal damage, the risk of electric shock can be effectively prevented. Figure 2 As

[0017] As Figure 3 Shown, in order to further solve the problem of diode heat dissipation, the heat dissipation surface of diode 1 is pasted on heat dissipation block 2, heat dissipation block 2 is stretched from aluminum material, one side is smooth surface, used for closely fitting with the heat dissipation surface of diode 1, the other side has a plurality of parallel heat dissipation fins, used for increasing the heat dissipation area.

[0018] Silicone grease is coated between diode 1 and heat dissipation block 2, further increases the heat transfer effect between the two, ensures that the diode can also maintain stable temperature when working under high load.

[0019] Thermistor 3 is also arranged at diode 1, used for monitoring the temperature condition of the diode, and feeds back to the charger, the charger can adjust the working state in real time according to the temperature condition of diode 1, to protect the normal operation of the whole vehicle charging circuit, prevents the fault caused by overheating.

[0020] The box cover 4 is further covered on the smooth surface of the heat dissipation block, and the box cover 4 is integrated with the smooth surface of the heat dissipation block, thereby forming protection for the diode 1. The box cover 4 and the heat dissipation block 2 can be fixed by sealing glue, or a buckle structure or a screw fixing mode can be designed, so that the box cover 4 can be firmly fixed on the heat dissipation block 2. In view of the requirements of dustproof and waterproof, a sealing strip or sealing glue can be added between the box cover 4 and the heat dissipation block 2, so as to ensure that the assembled whole has good sealing performance.

[0021] The box cover 4 is provided with a wire outlet for leading out the signal lines of the diode 1 and the thermistor 3 from the box, and connecting to the connector 5. The other end of the connector 5 is connected to the charging wire harness (i.e. the positive connection line of the lithium battery and the charging port). In order to realize quick docking, the connector 5 can adopt a quick connector, such as a plug-in connector.

Claims

1. A shock protection device for a lithium battery charging port, characterized in that, A diode with the conducting direction from the charging port to the lithium battery is connected in series between the positive connection line of the lithium battery and the charging port, and the diode is fixed and cooled by a cooling block, and a box cover for covering the diode is arranged on the cooling block.

2. The protection device according to claim 1, wherein The cooling block is a block structure stretched from aluminum material.

3. The protection device according to claim 1, wherein The front surface of the cooling block is a smooth surface for attaching the diode, and the back surface is provided with a plurality of cooling fins.

4. The shock protection device for lithium battery charging port according to claim 1, characterized in that, A layer of silicone grease is arranged between the diode and the cooling block.

5. The shock protection device for lithium battery charging port according to claim 1, characterized in that, A thermistor for monitoring the temperature of the diode is further included.

6. The protection device according to claim 5, wherein the protection device is configured to be connected to the lithium battery charging port. The box cover is provided with a through hole for the diode and the thermistor signal line, and the diode signal line is connected to the lithium battery and the charging port positive connection through a connector.

7. The shock protection device for lithium battery charging port according to claim 1, characterized in that, The box cover and the cooling block are fixed by sealing glue, buckle structure or screw.

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