New energy automobile pre-charging resistor

Abstract

The utility model relates to the technical field of new energy automobiles, in particular to a new energy automobile pre-charging resistor which comprises a shell which is a hollow cuboid. The device further comprises an insulating rod, a resistance wire and a leading-out piece. The shell is fixedly arranged in a circuit breaking unit BDU of the battery pack in the vertical direction. The two insulating rods are fixedly arranged in the shell, and the two insulating rods are in mirror symmetry along the perpendicular bisector of the shell and are parallel to the perpendicular bisector of the shell; one resistance wire is wound on each insulating rod, and the lower ends of the two resistance wires are electrically connected; the two leading-out sheets are fixedly arranged at the top of the shell, and one of the leading-out sheets is electrically connected with the upper end of one of the resistance wires; according to the utility model, the resistance wire in the length direction is separated into two sections to be wound and vertically mounted, so that the length of the pre-charging resistor is effectively shortened under the condition that the power is met, and convenience is provided for realizing reasonable utilization of the space in the BDU.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy vehicles, in particular to a pre-charging resistor for new energy vehicles. Background Art

[0002] A filter capacitor is connected in parallel to the input end of the motor control of new energy vehicles. When the main circuit is powered on, the power supply needs to charge the capacitor. The instantaneous charging of the capacitor is equivalent to a short circuit, and the current is as high as thousands of amperes, which will cause the relay contacts to stick together. Therefore, a pre-charge resistor is connected in parallel to the main relay of the motor controller circuit for current limiting. The pre-charge resistor is generally a rectangular structure installed in the horizontal direction. It is generally installed in the battery pack disconnect unit BDU in the battery pack. As the space occupied by the battery module continues to increase, the space of the BDU will become smaller and smaller. The commonly used pre-charge resistor is limited due to the large space occupied in the horizontal direction.

[0003] The utility model with announcement number CN216487520U discloses a plug-in automobile pre-charging resistor, including a shell, a mounting groove, a fixing block, an arc mouth, a connector, a through hole, a block, a connecting rod, a metal sleeve, a resistance wire, a ceramic core, a filler and a socket. The filler is provided with a ceramic core, and a resistance wire is sleeved on an outer wall on one side of the ceramic core. A fixing plate is provided at the bottom end of the resistance wire, and sockets are symmetrically opened on the top outer wall of the fixing plate, and the connector is sleeved on an inner wall on one side of the socket. The bottom end of the fixing plate is symmetrically provided with through holes, and the through holes are opened on an outer wall on one side of the connector.

[0004] As shown in the above technical solution, the resistance wire of the commonly used pre-charging resistor is generally wound in a single section. In order to meet the power requirements, the single-section wound pre-charging resistor is generally longer, which requires the commonly used pre-charging resistor to occupy more lateral space when installed in the BDU, limiting the effective use of the internal space of the BDU. Utility Model Content

[0005] In view of this, the utility model proposes a pre-charging resistor for new energy vehicles, which effectively shortens the length of the pre-charging resistor while meeting the power requirement by separating the resistance wire in the length direction into two sections and winding them vertically, thereby providing convenience for realizing the rational use of the space in the BDU.

[0006] The technical solution of the utility model is achieved in this way:

[0007] The utility model provides a new energy vehicle pre-charging resistor, comprising a shell, wherein the shell is a hollow cuboid;

[0008] It also includes an insulating rod, a resistance wire and a lead-out sheet, wherein:

[0009] The housing is fixedly arranged in a vertical direction in a circuit breaker unit BDU of the battery pack;

[0010] Two insulating rods are fixedly arranged inside the shell, and the two insulating rods are mirror-symmetrical along the perpendicular midline of the shell and parallel to the perpendicular midline of the shell;

[0011] One resistance wire is wound on each insulating rod, and the lower ends of the two resistance wires are electrically connected;

[0012] Two lead-out pieces are fixedly provided on the top of the housing, one of the lead-out pieces is electrically connected to the upper end of one of the resistance wires, and the other lead-out piece is electrically connected to the upper end of the other resistance wire.

[0013] On the basis of the above technical solution, preferably, it further comprises a metal sheet, wherein:

[0014] The metal sheet is arranged on the inner side of the shell, and the lower end of the insulating rod passes through the metal sheet downward and is fixedly connected;

[0015] The lower ends of the two resistance wires are fixedly arranged on the metal sheet.

[0016] On the basis of the above technical solution, preferably, the metal sheet is provided with two through holes vertically penetrating therethrough, and the two through holes correspond to the two insulating rods one by one, wherein:

[0017] A plurality of abutting portions are fixedly arranged along the circumferential direction on the inner side of the through hole;

[0018] After the lower end of the insulating rod passes through the corresponding through hole, one end of the abutting portion in the through hole abuts against the side of the insulating rod.

[0019] On the basis of the above technical solution, preferably, the lead-out piece includes a clamp ring and an electrode piece, wherein:

[0020] The electrode sheet is fixedly arranged on the top of the clamp ring, and the electrode sheet passes through the top of the housing upward to the outside, and the electrode sheet is electrically connected to the upper end of the corresponding resistance wire;

[0021] The clamping ring is sleeved on the upper end of the corresponding insulating rod and fixedly connected.

[0022] Based on the above technical solution, preferably, the clamping ring is in a C shape.

[0023] On the basis of the above technical solution, preferably, the inner surface of the shell is covered with an insulating sheet.

[0024] On the basis of the above technical solution, preferably, the interior of the shell is filled with insulating material.

[0025] On the basis of the above technical solution, preferably, positioning grooves are provided on both sides of the upper end of the shell.

[0026] On the basis of the above technical solution, preferably, it further comprises a spring, wherein:

[0027] Countersunk holes are provided on both sides of the shell;

[0028] The spring sheet is disposed one at a time in each of the countersunk holes, one end of the spring sheet is fixedly disposed in the corresponding countersunk hole, and the other end extends outwardly from the countersunk hole.

[0029] On the basis of the above technical solution, preferably, the resistance wire is wound into a square spring shape.

[0030] The new energy vehicle pre-charging resistor of the utility model has the following beneficial effects compared with the prior art:

[0031] (1) The outer shell is set to be a hollow rectangular parallelepiped, and the outer shell is fixedly arranged vertically in the circuit breaker unit BDU of the battery pack, and two insulating rods are arranged inside the outer shell, so that the resistance wire in the length direction is separated into two sections and respectively wound on the two insulating rods. The two insulating rods are mirror-symmetrical along the mid-vertical line of the outer shell and are parallel to the mid-vertical line of the outer shell. This structure facilitates the vertical installation of the pre-charging resistor. When the power is met, the space in the BDU can be rationally utilized, which provides conditions for further improving the battery capacity and the compactness of the battery pack structure.

[0032] (2) By filling the inside of the shell with insulating material, it is convenient to fix the resistance wire through the insulating material, thereby increasing the resistance wire's ability to resist short circuits. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 It is a three-dimensional diagram of the pre-charging resistor of the new energy vehicle of the utility model;

[0035] Figure 2 It is a schematic diagram of the internal structure of the utility model;

[0036] Figure 3 It is a partial stereogram of the utility model;

[0037] Figure 4 for Figure 3 A stereogram from another perspective;

[0038] In the figure: 1, shell; 2, insulating rod; 3, resistance wire; 4, lead-out plate; 5, metal sheet; 6, spring; 41, clamping ring; 42, electrode sheet; 101, positioning groove; 102, countersunk hole; 501, through hole; 502, supporting part. DETAILED DESCRIPTION

[0039] The following will be combined with the specific implementation of the utility model to clearly and completely describe the technical solution in the utility model. Obviously, the described implementation is only a part of the implementation of the utility model, not all of the implementations. Based on the implementation of the utility model, all other implementations obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0040] like Figure 1 As shown, the new energy vehicle pre-charging resistor of the utility model includes a shell 1, an insulating rod 2, a resistance wire 3 and a lead-out sheet 4.

[0041] The housing 1 is a hollow rectangular metal shell. Figure 2 As shown, the top of the metal shell is open, and its inner surface is covered with an insulating sheet. The insulating sheet is made of asbestos and is used for insulation of the shell 1; the insulating rod 2, the resistance wire 3 and the lead-out sheet 4 are installed in the shell 1 through the opening; after installation, an insulating material, such as quartz sand, is filled into the shell 1 through the opening. The quartz sand is initially fluid and mixed with glue. When the quartz sand is filled and solidified inside the shell 1, the quartz sand closes the opening, and the upper end of the lead-out sheet 4 extends upward from the quartz sand, and the rest is wrapped in the quartz sand. The quartz sand can fix the resistance wire 3 to prevent the two resistance wires 3 from shifting and overlapping, thereby effectively increasing the short-circuit resistance of the resistance wire 3.

[0042] When in use, the shell 1 is fixedly arranged vertically in the circuit-breaking unit BDU of the battery pack, that is, the shell 1 is vertically assembled into the BDU in the battery pack; for the convenience of installation, positioning grooves 101 are arranged on both sides of the upper end of the shell 1, and correspondingly, matching protrusions need to be arranged on the plastic bottom shell of the BDU; countersunk holes 102 are arranged on both sides of the shell 1, and a spring piece 6 is arranged in each countersunk hole 102, one end of the spring piece 6 is fixedly arranged in the corresponding countersunk hole 102, and the other end extends outward from the countersunk hole 102, and correspondingly, matching buckles need to be arranged on the plastic bottom shell of the BDU; when installing, the protrusion is plugged into the positioning groove 101 for positioning, and the spring piece 6 is snapped into the buckle to complete the installation and fixation of the shell 1, and the buckle and protrusion are not drawn in the figure.

[0043] like Figure 2As shown, the insulating rod 2 is a long rectangle, and two of them are fixed vertically inside the shell 1. The two insulating rods 2 are mirror-symmetrical along the perpendicular bisector of the shell 1 and are parallel to the perpendicular bisector of the shell 1. One resistance wire 3 is wound on each insulating rod 2. After winding, the resistance wire 3 is in the shape of a square spring, and the lower ends of the two resistance wires 3 are electrically connected.

[0044] Two lead-out pieces 4 are fixedly provided on the top of the housing 1, one of the lead-out pieces 4 is electrically connected to the upper end of one of the resistance wires 3 by welding, and the other lead-out piece 4 is electrically connected to the upper end of the other resistance wire 3 by welding, wherein the resistance wire 3 and the lead-out piece 4 are welded with two or more welding points to increase welding reliability; specifically, the lead-out piece 4 includes a clamping ring 41 and an electrode piece 42, wherein, as Figure 3 As shown, the electrode sheet 42 is fixedly arranged on the top of the clamping ring 41, and the electrode sheet 42 penetrates upward from the top of the shell 1 to the outside, and the electrode sheet 42 is electrically connected to the upper end of the corresponding resistance wire 3; the clamping ring 41 is sleeved on the upper end of the corresponding insulating rod 2 and fixedly connected; specifically, the clamping ring 41 is C-shaped, and its material is spring steel. The inner diameter of the clamping ring 41 is smaller than the outer diameter of the upper end of the insulating rod 2. When installing the clamping ring 41, the inner hole of the clamping ring 41 is expanded, and then the upper end of the insulating rod 2 is inserted into the inner side of the clamping ring 41, and then the clamping ring 41 is clamped and fixed to the upper end of the insulating rod 2 by elastic force.

[0045] In the above structure, the two resistance wires 3 are electrically connected through the metal sheet 5 to achieve the purpose of connecting the two resistance wires 3. Specifically, the metal sheet 5 is arranged on the inner side of the outer shell 1, and the lower end of the insulating rod 2 penetrates the metal sheet 5 downward and is fixedly connected; the lower ends of the two resistance wires 3 are welded and fixed on the metal sheet 5, wherein the welding of the resistance wire 3 and the metal sheet 5 adopts two or more welding points to increase the welding reliability.

[0046] The metal sheet 5 is fixed to the lower end of the insulating rod 2. Specifically, Figure 4 As shown, two through holes 501 are vertically penetrated on the metal sheet 5, and the two through holes 501 correspond to the two insulating rods 2 one by one, wherein a plurality of abutting portions 502 are fixedly provided along the circumferential direction on the inner side of the through holes 501, the metal sheet 5 is a spring steel sheet, and the abutting portions 502 are obtained by stamping; after the lower end of the insulating rod 2 passes through the corresponding through hole 501, one end of the abutting portion 502 in the through hole 501 is elastically abutted against the side of the insulating rod 2.

[0047] The method of using the pre-charging resistor of the new energy vehicle of the utility model is as follows:

[0048] An insulating sheet is pasted on the inner surface of the shell 1, and the resistance wire 3 is wound on the insulating rod 2. Then, the lower end of the insulating rod 2 is inserted into the through hole 501, and the lead-out piece 4 is installed on the upper end of the insulating rod 2. The lower ends of the two resistance wires 3 are welded to the metal sheet 5, and the upper ends of the two resistance wires 3 are welded to the corresponding lead-out pieces 4. Thereafter, the welded resistance wires 3 are placed in the shell 1, so that the lower end of the insulating rod 2 touches the bottom of the shell 1, and the electrode sheet 42 of the lead-out piece 4 is exposed from the shell 1. The insulating rod 2 is kept in a vertical state, and the shell 1 is filled with fluid quartz sand. After the quartz sand is solidified, a complete pre-charge resistor is obtained.

[0049] When installing the pre-charging resistor, the housing 1 is vertically assembled into the BDU in the battery pack. In this state, the horizontal space in the BDU can be saved.

[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A new energy vehicle pre-charging resistor, comprising a housing (1), wherein: The housing (1) is a hollow rectangular parallelepiped; It is characterized in that it also includes an insulating rod (2), a resistance wire (3) and a lead-out sheet (4), wherein: The housing (1) is fixedly arranged vertically in a circuit breaker unit BDU of the battery pack; Two insulating rods (2) are fixedly arranged inside the housing (1), and the two insulating rods (2) are mirror-symmetrical along the perpendicular midline of the housing (1) and are parallel to the perpendicular midline of the housing (1); One resistance wire (3) is wound on each insulating rod (2), and the lower ends of the two resistance wires (3) are electrically connected; Two lead-out pieces (4) are fixedly provided on the top of the housing (1), one of the lead-out pieces (4) is electrically connected to the upper end of one of the resistance wires (3), and the other lead-out piece (4) is electrically connected to the upper end of another resistance wire (3).

2. The new energy vehicle pre-charging resistor according to claim 1, characterized in that: Also included is a metal sheet (5), wherein: The metal sheet (5) is arranged on the inner side of the housing (1), and the lower end of the insulating rod (2) passes through the metal sheet (5) downward and is fixedly connected; The lower ends of the two resistance wires (3) are fixedly arranged on the metal sheet (5).

3. The new energy vehicle pre-charging resistor according to claim 2, characterized in that: The metal sheet (5) is provided with two through holes (501) penetrating vertically, and the two through holes (501) correspond to the two insulating rods (2) one by one, wherein: A plurality of abutting portions (502) are fixedly arranged along the circumferential direction on the inner side of the through hole (501); After the lower end of the insulating rod (2) passes through the corresponding through hole (501), one end of the abutting portion (502) in the through hole (501) abuts against the side of the insulating rod (2).

4. The new energy vehicle pre-charging resistor according to claim 1, characterized in that: The lead-out piece (4) comprises a clamp ring (41) and an electrode piece (42), wherein: The electrode sheet (42) is fixedly arranged on the top of the clamping ring (41), and the electrode sheet (42) penetrates upward through the top of the housing (1) to the outside, and the electrode sheet (42) is electrically connected to the upper end of the corresponding resistance wire (3); The clamping ring (41) is sleeved on the upper end of the corresponding insulating rod (2) and fixedly connected.

5. The new energy vehicle pre-charging resistor according to claim 4, characterized in that: The clamping ring (41) is in a C shape.

6. The new energy vehicle pre-charging resistor according to claim 1, characterized in that: The inner surface of the housing (1) is covered with an insulating sheet.

7. The new energy vehicle pre-charging resistor according to claim 6, characterized in that: The interior of the housing (1) is filled with insulating material.

8. The new energy vehicle pre-charging resistor according to claim 1, characterized in that: Positioning grooves (101) are provided on both sides of the upper end of the housing (1).

9. The new energy vehicle pre-charging resistor according to claim 8, characterized in that: It also includes a shrapnel (6), wherein: Countersunk holes (102) are provided on both sides of the housing (1); One spring piece (6) is arranged in each of the countersunk holes (102); one end of the spring piece (6) is fixedly arranged in the corresponding countersunk hole (102), and the other end protrudes outward from the countersunk hole (102).

10. The new energy vehicle pre-charging resistor according to claim 1, characterized in that: The resistance wire (3) is wound into a square spring shape.

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