Low-temperature-rise charging pile

Abstract

The utility model relates to the technical field of charging piles, and provides a low temperature rise charging pile, which comprises a pile body, a charging gun, a cable and a circuit board, the circuit board is arranged in the pile body, one end of the cable is connected with the charging gun, the other end of the cable is connected with the circuit board through a crimping piece, the crimping piece comprises two crimping wings, and the crimping wings are connected with the charging gun. The two crimping wings are embedded into a conductor of the cable, the outer side walls of the two crimping wings are in contact, and the sectional area of the conductor of the cable is 70%-90% of the sectional area of the conductor of the cable when the conductor of the cable is not compressed at the corresponding positions of the two crimping wings. According to the utility model, the temperature rise of the charging pile during working can be effectively reduced, and the reliability, safety and service life of the charging pile are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of charging piles, and in particular to a low-temperature-rise charging pile. Background Art

[0002] With the global emphasis on environmental protection and sustainable development, electric vehicles (EVs) have been widely promoted and applied as a clean energy vehicle. Charging piles, as crucial infrastructure for EVs, are crucial for their efficiency and safety. Current AC charging piles have numerous hot spots, which, under abnormal circumstances, can easily lead to overheating, resulting in charging failure. In severe cases, this can cause ablation and fire, posing a safety risk. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a low-temperature-rise charging pile, which can effectively reduce the temperature rise of the charging pile during operation and improve the reliability, safety and life of the charging pile.

[0004] The technical solutions adopted in this utility model are as follows:

[0005] A low-temperature-rise charging pile comprises a pile body, a charging gun, a cable, and a circuit board. The circuit board is arranged in the pile body, one end of the cable is connected to the charging gun, and the other end of the cable is connected to the circuit board via a crimping piece. The crimping piece includes two crimping wings, both of which are embedded in the conductor of the cable, and the outer side walls of the two crimping wings are in contact. At the positions corresponding to the two crimping wings, the cross-sectional area of the conductor of the cable is 70% to 90% of the cross-sectional area of the conductor of the cable when it is not compressed.

[0006] Furthermore, there are multiple crimping parts, and the multiple crimping parts include a live wire terminal and a neutral wire terminal.

[0007] Furthermore, the crimping piece is fixed to the circuit board via a screw assembly.

[0008] Furthermore, the screw assembly includes a cross recessed pan head screw, a flat washer and a spring washer sleeved on the cross recessed pan head screw.

[0009] Furthermore, the circuit board is a multi-layer board, and the circuit sizes on the outer layer board and the inner layer board of the circuit board are set according to the corresponding load capacity.

[0010] Furthermore, the circuit board includes a relay, the coil of the relay is made of copper wire, the wire diameter of the copper wire is 0.04~0.06mm, the winding diameter is 3~5mm, and the number of winding turns is 900~920 turns.

[0011] Furthermore, the contact area of the relay contacts is 10-12 mm 2 .

[0012] Furthermore, the terminal of the charging gun and one end of the cable are ultrasonically welded.

[0013] Furthermore, the surface of the terminal of the charging gun has a metal plating layer.

[0014] Furthermore, the metal plating layer is a Ni plating layer or an Ag plating layer.

[0015] Beneficial effects of the utility model:

[0016] The utility model can effectively ensure the stability of crimping by designing a reasonable cable crimping structure and compression ratio, avoid insufficient pull-out force, high impedance and ablation due to too low compression ratio, or wire breakage, poor current carrying capacity and severe heat generation due to too high compression ratio, thereby effectively reducing the temperature rise of the charging pile during operation and improving the reliability, safety and life of the charging pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a low-temperature rise charging pile according to an embodiment of the present utility model;

[0018] Figure 2 This is a cross-sectional view of a cable crimping position according to an embodiment of the present invention, taken along the radial direction of the cable;

[0019] Figure 3 This is a schematic structural diagram of a screw assembly according to an embodiment of the present invention.

[0020] Reference numerals:

[0021] Pile body 10 , charging gun 20 , cable 30 , circuit board 40 , crimping piece 50 , screw assembly 60 , relay 41 , crimping wing 51 , cross recessed pan head screw 61 , flat washer 62 , spring washer 63 . DETAILED DESCRIPTION

[0022] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] like Figure 1As shown, the low-temperature rise charging pile of the embodiment of the present invention includes a pile body 10, a charging gun 20, a cable 30 and a circuit board 40. The circuit board 40 is arranged in the pile body 10, one end of the cable 30 is connected to the charging gun 20, and the other end of the cable 30 is connected to the circuit board 40 through a crimping piece 50. Figure 2 As shown, the crimping piece 50 includes two crimping wings 51, both of which are embedded in the conductor of the cable 30, and the outer side walls of the two crimping wings 51 are in contact with each other. At the positions corresponding to the two crimping wings 51, the cross-sectional area of the conductor of the cable 30 is 70% to 90% of the cross-sectional area of the conductor of the cable 30 when it is not compressed.

[0024] In one embodiment of the present invention, the low-temperature rise charging pile may be an AC pile.

[0025] In one embodiment of the present invention, there are multiple crimping members 50 , and the multiple crimping members 50 include a live wire terminal and a neutral wire terminal.

[0026] According to the low-temperature-rise charging pile of the embodiment of the present invention, by designing a reasonable cable crimping structure and compression ratio, it is possible to effectively ensure the stability of the crimping, avoid insufficient pull-out force, high impedance, and ablation due to a too low compression ratio, or avoid wire breakage, poor current-carrying capacity, and severe heat generation due to a too high compression ratio, thereby effectively reducing the temperature rise of the charging pile during operation and improving the reliability, safety, and life of the charging pile.

[0027] Furthermore, if Figure 1 As shown, the crimping member 50 can be fixed on the circuit board 30 by means of a screw assembly 60. Figure 3 As shown, the screw assembly 60 includes a cross recessed pan head screw 61, a flat washer 62 and a spring washer 63 sleeved on the cross recessed pan head screw 61. By adopting the screw assembly 60 of this structure, the influence of vibration on the torque during the screw tightening process can be avoided, and it is suitable to adopt Atlas tightening technology to control the torque of the screw, for example, the torque of the screw is controlled within the range of 1.2N·m~1.35N·m. In this way, it is possible to avoid the screw from heating up seriously due to low torque and looseness, or high impedance and poor contact due to high torque, thread slippage and looseness, and the position where the screw is locked is prone to burning and fire during long-term use, thereby effectively reducing the temperature rise of the charging pile during operation.

[0028] Furthermore, the circuit board 40 in the embodiment of the present invention is a multilayer board. The circuit board 40 can be made of TG150 substrate, with a thickness of 2mm and a copper thickness of 2oz, and can have four layers. The circuit dimensions on the outer and inner layers of the circuit board 40 in the embodiment of the present invention can be set according to their respective load capacities. The relationship between rated current and circuit dimensions is as follows:

[0029]

[0030] Where I is the rated current, ΔT is the temperature rise, A is the circuit cross-sectional area, and k is the correction factor. For the outer layer board, k can be 0.048, and for the inner layer board, k can be 0.024.

[0031] Taking the outer layer circuit rated current of 32A, the inner layer circuit rated current of 16A, and the temperature rise within 35°C as an example, according to the above relationship, if the copper thickness of the circuits on the outer and inner layers is 2oz, that is, 2.76mil, then the copper width of the circuits on the outer and inner layers is greater than 335mil.

[0032] The utility model can effectively reduce the temperature rise and ensure the high temperature resistance of the circuit board by adopting high-specification base material and circuit size design.

[0033] Furthermore, if Figure 1 As shown, the circuit board 40 of the embodiment of the present invention includes a relay 41 .

[0034] In one embodiment of the present invention, the coil of relay 41 can be made of copper wire with a wire diameter of 0.04-0.06 mm, a winding diameter of 3-5 mm, and 900-920 turns. Preferably, the copper wire has a wire diameter of 0.05 mm, a winding diameter of 4 mm, and 910 turns. Under a conventional relay voltage of 12 V, the coil power consumption of relay 41 with the above structure is approximately 0.4 W, which can effectively reduce the heat generated by relay 41 and thus the temperature rise during operation of the charging pile.

[0035] In one embodiment of the present invention, the contact diameter of the relay 41 is 4-5 mm, and the contact area of the relay 41 is 10-12 mm. 2 Preferably, the contact diameter of the relay 41 is 4.5 mm, and the contact area of the relay 41 is 11 mm. 2 By designing the contact size of the relay 41, the contact impedance of the relay 41 can be controlled within 3 mΩ, thereby further reducing the heat generated by the relay 41 and effectively reducing the temperature rise of the charging pile during operation.

[0036] Furthermore, the terminals of the charging gun 20 of this embodiment of the present invention are ultrasonically welded to one end of the cable 30. The surface of the terminals of the charging gun 20 is coated with a metal layer, such as a 2μm Ni layer or a 3μm Ag layer. Ultrasonic welding effectively reduces the impedance of the connection, thereby lowering the temperature rise. Plating the terminals of the charging gun 20 with Ni or Ag ensures the terminals' resistance to plugging and unplugging, improves their conductivity, and reduces their temperature rise.

[0037] Furthermore, a temperature control strategy can be adopted to reduce the temperature rise of the charging pile during operation.

[0038] Specifically, when collecting the temperature of a charging pile, multiple temperature collection points can be selected based on the heating characteristics of the entire pile, such as temperature sensors placed at locations such as the power module and wiring terminals. The temperature sensor can use a high-precision ADC, and the collected data can be filtered through a filtering algorithm to remove obviously unreasonable values. For example, data with values above a set upper limit or below a set lower limit can be filtered out, ultimately obtaining accurate temperature data.

[0039] When controlling the charging pile, multiple temperature thresholds can be set. When the temperature of the charging pile is less than the first temperature threshold, the charging pile can be controlled to operate at full power; when the temperature of the charging pile is greater than or equal to the first temperature threshold and less than the second temperature threshold, the charging pile can be controlled to reduce power and operate at the first power; when the temperature of the charging pile is greater than or equal to the second temperature threshold and less than the third temperature threshold, the charging pile can be controlled to further reduce power and operate at the second power, and so on. Among them, the first temperature threshold is less than the second temperature threshold, the second temperature threshold is less than the third temperature threshold, and the second power is less than the first power. When the temperature of the charging pile is greater than the alarm threshold, an overtemperature alarm can be triggered and the charging pile can be controlled to suspend charging. After suspending charging, when the temperature of the charging pile is less than the alarm release threshold, the overtemperature alarm can be released and the charging pile can be controlled to restart charging.

[0040] The above-mentioned temperature collection and charging power control strategy can also effectively reduce the temperature rise of the charging pile during operation.

[0041] In the description of the present invention, “plurality” means two or more, unless otherwise clearly defined.

[0042] In the present invention, unless otherwise clearly specified and limited, terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements.

[0043] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0044] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A low temperature rise charging pile, characterized in that: The invention comprises a pile body (10), a charging gun (20), a cable (30) and a circuit board (40), wherein the circuit board (40) is arranged in the pile body (10), one end of the cable (30) is connected to the charging gun (20), and the other end of the cable (30) is connected to the circuit board (40) via a crimping piece (50), wherein the crimping piece (50) comprises two crimping wings (51), both of the two crimping wings (51) are embedded in the conductor of the cable (30), and the outer side walls of the two crimping wings (51) are in contact with each other, and at the positions corresponding to the two crimping wings (51), the cross-sectional area of the conductor of the cable (30) is 70% to 90% of the cross-sectional area of the conductor of the cable (30) when it is not compressed.

2. The low-temperature rise charging pile according to claim 1, characterized in that: There are a plurality of crimping parts (50), and the plurality of crimping parts (50) include a live wire terminal and a neutral wire terminal.

3. The low temperature rise charging pile according to claim 1 or 2, characterized in that: The crimping piece (50) is fixed to the circuit board (40) via a screw assembly (60).

4. The low-temperature rise charging pile according to claim 3, characterized in that: The screw assembly (60) comprises a cross-slot pan head screw (61), a flat washer (62) sleeved on the cross-slot pan head screw (61), and a spring washer (63).

5. The low-temperature rise charging pile according to claim 1, characterized in that: The circuit board (40) is a multi-layer board, and the circuit sizes on the outer layer board and the inner layer board of the circuit board (40) are respectively set according to corresponding load capacities.

6. The low-temperature rise charging pile according to claim 1, characterized in that: The circuit board (40) includes a relay (41), and the coil of the relay (41) is made of copper wire, the wire diameter of the copper wire is 0.04-0.06 mm, the winding diameter is 3-5 mm, and the number of winding turns is 900-920 turns.

7. The low-temperature rise charging pile according to claim 6, characterized in that: The contact area of the relay (41) is 10-12 mm 2 .

8. The low-temperature rise charging pile according to claim 1, characterized in that: The terminal of the charging gun (20) and one end of the cable (30) are ultrasonically welded.

9. The low-temperature rise charging pile according to claim 1, characterized in that: The surface of the terminal of the charging gun (20) has a metal plating layer.

10. The low-temperature rise charging pile according to claim 9, characterized in that: The metal plating layer is a Ni plating layer or an Ag plating layer.

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