Automobile high-precision current sensor

Abstract

The utility model relates to the technical field of new energy automobiles, in particular to an automobile high-precision current sensor, which comprises a current sensor. Four groups of bolts are movably inserted into the current sensor, fixing rods are fixedly mounted at the upper end and the lower end of the current sensor, first limiting sleeves are rotatably mounted on the four groups of fixing rods, second limiting sleeves are rotatably mounted on the four groups of fixing rods, and the four groups of first limiting sleeves and the four groups of second limiting sleeves are oppositely arranged; and grooves are formed in the four groups of first limiting sleeves and the four groups of second limiting sleeves. According to the utility model, after the current sensor is fixedly installed on the sealing box outside the power battery pack by using the four groups of bolts, the first limiting sleeve and the second limiting sleeve are rotatably closed, the first limiting sleeve and the second limiting sleeve are sleeved on the front ends of the bolts, and the convex blocks are inserted in the through holes; the two limiting blocks in the protruding block pop out to be attached to the outer wall of the first limiting sleeve, and therefore the front end of the bolt is limited and fixed.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy vehicles, in particular to a high-precision current sensor for an automobile. Background Art

[0002] With the implementation of the national double-credit policy, new energy vehicles and power systems are bound to usher in rapid development. The main function of the current sensor for the power battery pack of new energy vehicles is to measure the total input and output current of the power battery pack. From the application purpose of the current sensor, it can be seen that the current sensor is a core component necessary for power battery pack monitoring. The output of the current sensor directly determines the battery management system's judgment on the battery's state of charge. The accuracy of the sensor directly affects the cruising range of new energy vehicles and the service life of the battery pack. The output accuracy of the sensor when the input is zero ampere (zero error) directly determines the charge and discharge state of the power battery pack.

[0003] High-precision current sensors for automobiles are generally installed near the battery pack and are usually fixed with screws in the sealed box of the battery pack. However, if they are fixed with screws alone, they will become loose due to the vibration of the vehicle running, and their stability is low. This has a certain impact on the working accuracy and stability of the sensor, resulting in reduced test accuracy and thus unable to guarantee its normal operation. To this end, we have proposed a high-precision automotive current sensor to solve the above problems. Utility Model Content

[0004] The purpose of the present utility model is to provide a high-precision current sensor for automobiles to solve the problem proposed in the above-mentioned background art that high-precision current sensors for automobiles are generally installed near the battery pack and are usually fixed with screws in a sealed box of the battery pack. However, if they are fixed with screws alone, they may become loose due to the vibration of the vehicle during operation, resulting in low stability.

[0005] To achieve the above-mentioned object, the present utility model provides the following technical solutions: a high-precision current sensor for an automobile, comprising a current sensor;

[0006] Four groups of bolts are movably inserted on the current sensor, and fixing rods are fixedly installed at the upper and lower ends of the current sensor. The first limit sleeves are rotatably installed on the four groups of fixing rods, and the second limit sleeves are rotatably installed on the four groups of fixing rods. The four groups of the first limit sleeves and the four groups of the second limit sleeves are arranged opposite to each other, and grooves are provided in the four groups of the first limit sleeves and the four groups of the second limit sleeves. Locking components are provided on the four groups of the first limit sleeves and the four groups of the second limit sleeves.

[0007] Preferably, a heat sink is fixedly installed in the current sensor, a guide groove is annularly provided on the inner wall of the heat sink, and a front end opening of the guide groove is connected to the inner part of the current sensor.

[0008] Preferably, the locking assembly includes a through hole and a protrusion, the through hole is provided on the first limit sleeve, the protrusion is fixedly installed on the second limit sleeve, the protrusion is movably inserted in the through hole, movable grooves are symmetrically provided in the protrusion, springs are installed in the two groups of movable grooves, and limiting blocks are movably installed at the openings of the two groups of movable grooves, and the two groups of limit blocks are in contact with the outer wall of the first limit sleeve at the opening of the through hole.

[0009] Preferably, the inner wall of the through hole is funnel-shaped, and the opening diameter at the joint between the through hole and the second limiting sleeve is larger than the diameter of the inner wall at the opposite end.

[0010] Preferably, the inner walls of the two groups of grooves are hexagonal in shape, and the inner walls of the two groups of grooves are adapted to the front end of the bolt.

[0011] Preferably, a retaining ring is fixedly installed on the rear side of the first limit sleeve and the second limit sleeve, and a convex ring is fixedly installed on the front side of the current sensor. The outer wall of the convex ring fits with the inner walls of the two groups of retaining rings. Multiple groups of plug-in blocks are annularly installed on the inner walls of the two groups of retaining rings. Multiple groups of slots are annularly opened on the outer wall of the convex ring, and multiple groups of plug-in blocks are movably inserted into the multiple groups of slots.

[0012] Compared with the prior art, the beneficial effect of the present invention is as follows: after the present invention uses four groups of bolts to fix the current sensor on the sealed box outside the power battery pack, the first limit sleeve and the second limit sleeve are rotated closed, the first limit sleeve and the second limit sleeve are sleeved on the front end of the bolt, and the protrusion is inserted into the through hole, and the two groups of limit blocks in the protrusion pop out and fit together with the outer wall of the first limit sleeve, thereby limiting and fixing the front end of the bolt, avoiding the loosening of the bolt due to vibration when the current sensor is fixed on the sealed box outside the power battery pack by the bolt, and improving the locking and anti-loosening effect of the bolt. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 This is a schematic front view of the structure of the present utility model;

[0015] Figure 2 This is a frontal expanded schematic diagram of the structures of the first limiting sleeve and the second limiting sleeve in the present utility model;

[0016] Figure 3This is a front cross-sectional schematic diagram of the structure of the first limiting sleeve and the second limiting sleeve in the present utility model;

[0017] Figure 4 This is a schematic rear cross-sectional view of the structure of the first limiting sleeve and the second limiting sleeve in the present invention;

[0018] Figure 5 For this utility model Figure 3 A partial enlarged schematic diagram;

[0019] Figure 6 For this utility model Figure 4 A partial enlarged schematic diagram of B in the middle.

[0020] In the figure: 1. Current sensor; 2. Heat sink; 3. Guide groove; 4. Bolt; 5. Fixing rod; 6. First limiting sleeve; 7. Second limiting sleeve; 8. Groove; 9. Through hole; 10. Protrusion; 11. Movable groove; 12. Spring; 13. Limit block; 14. Snap ring; 15. Raised ring; 16. Insert block; 17. Slot. DETAILED DESCRIPTION

[0021] The following will be combined with the 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.

[0022] See also Figure 1-6 , an embodiment provided by the utility model: a high-precision current sensor for an automobile, comprising a current sensor 1;

[0023] Four groups of bolts 4 are movably inserted on the current sensor 1, and fixing rods 5 are fixedly installed at the upper and lower ends of the current sensor 1. A first limiting sleeve 6 is rotatably installed on the four groups of fixing rods 5, and a second limiting sleeve 7 is rotatably installed on the four groups of fixing rods 5. The four groups of first limiting sleeves 6 and the four groups of second limiting sleeves 7 are arranged opposite to each other, and grooves 8 are provided in the four groups of first limiting sleeves 6 and the four groups of second limiting sleeves 7. Locking components are provided on the four groups of first limiting sleeves 6 and the four groups of second limiting sleeves 7. This device uses four groups of bolts 4 to install the current sensor 1 on the sealing box on the power battery pack, and the first limiting sleeve 6 and the second limiting sleeve 7 are fixedly installed on the bolts 4 by the locking assembly, thereby locking the bolts 4 to prevent loosening;

[0024] Furthermore, a heat sink 2 is fixedly installed inside the current sensor 1, and a guide groove 3 is provided in a ring shape on the inner wall of the heat sink 2. The front end opening of the guide groove 3 is connected to the current sensor 1. This structure guides the diversion through the heat sink 2 and the guide groove 3, thereby improving the flow speed and direction of the wind flow, thereby dissipating the heat of the current sensor 1.

[0025] Furthermore, the locking assembly includes a through hole 9 and a protrusion 10. The through hole 9 is opened on the first limit sleeve 6, and the protrusion 10 is fixedly installed on the second limit sleeve 7. The protrusion 10 is movably inserted in the through hole 9. Movable grooves 11 are symmetrically opened in the protrusion 10. Springs 12 are installed in the two groups of movable grooves 11. Limiting blocks 13 are movably installed at the openings of the two groups of movable grooves 11. The two groups of limiting blocks 13 are fitted with the outer wall of the first limit sleeve 6 at the opening of the through hole 9. When the first limit sleeve 6 and the second limit sleeve 7 are rotatably sleeved on the bolt 4, this structure is inserted into the through hole 9 through the protrusion 10, and the two groups of limiting blocks 13 pop out to fix the protrusion 10 in the through hole 9, thereby fixing the first limit sleeve 6 and the second limit sleeve 7 on the bolt 4, thereby limiting and fixing the bolt 4.

[0026] Furthermore, the inner wall of the through hole 9 is funnel-shaped, and the opening diameter of the through hole 9 where it fits with the second limiting sleeve 7 is larger than the inner wall diameter of the opposite end. This structure, based on the shape of the inner wall of the through hole 9, prevents the protrusion 10 from being unable to be inserted into the through hole 9 when the first limiting sleeve 6 and the second limiting sleeve 7 are rotated and closed.

[0027] Furthermore, the inner walls of the two groups of grooves 8 are hexagonal in shape, and the inner walls of the two groups of grooves 8 are adapted to the front end of the bolt 4. This structure, based on the shape of the inner walls of the two groups of grooves 8, enables the first limiting sleeve 6 and the second limiting sleeve 7 to be rotated and sleeved on the bolt 4. The two groups of grooves 8 fit with the bolt 4, thereby limiting and locking the bolt 4 to prevent rotation.

[0028] Furthermore, a retaining ring 14 is fixedly installed on the rear side of the first limit sleeve 6 and the second limit sleeve 7, and a convex ring 15 is fixedly installed on the front side of the current sensor 1. The outer wall of the convex ring 15 fits with the inner wall of the two groups of retaining rings 14. The inner walls of the two groups of retaining rings 14 are annularly installed with multiple groups of plug-in blocks 16. The outer wall of the convex ring 15 is annularly provided with multiple groups of slots 17. The multiple groups of plug-in blocks 16 are movably inserted into the multiple groups of slots 17. When the first limit sleeve 6 and the second limit sleeve 7 are rotated and closed, this structure drives the two groups of retaining rings 14 to rotate and close and the multiple groups of plug-in blocks 16 are inserted into the multiple groups of slots 17, thereby increasing the anti-rotation property of the first limit sleeve 6 and the second limit sleeve 7.

[0029] Working principle: When installing the current sensor 1, use four sets of bolts 4 to fix the current sensor 1 on the sealed box outside the power battery pack. After tightening the four sets of bolts 4, as shown in the following figure: Figure 3 and Figure 5As shown, the first limiting sleeve 6 and the second limiting sleeve 7 are rotatably sleeved on the front end of the bolt 4, and when the first limiting sleeve 6 and the second limiting sleeve 7 are closed, the protrusion 10 on the second limiting sleeve 7 is inserted into the through hole 9 on the first limiting sleeve 6, and the two groups of limiting blocks 13 in the two groups of movable grooves 11 pop out under the action of the restorative force of the two groups of springs 12, so that the two groups of limiting blocks 13 fit with the outer wall of the first limiting sleeve 6, thereby fixing the first limiting sleeve 6 and the second limiting sleeve 7 together. When the first limiting sleeve 6 and the second limiting sleeve 7 are rotated and closed, the two groups of snap rings 14 are driven to rotate and close. The multiple groups of inserts 16 on the inner walls of the two groups of snap rings 14 are inserted into the multiple groups of slots 17 on the outer wall of the convex ring 15, so that the bolt 4 can be prevented from loosening and fixed. The above is the entire working principle of the present utility model.

[0030] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A high-precision current sensor for an automobile, comprising a current sensor (1), characterized in that: Four groups of bolts (4) are movably inserted on the current sensor (1); fixed rods (5) are fixedly installed at both upper and lower ends of the current sensor (1); first limiting sleeves (6) are rotatably installed on the four groups of fixing rods (5); second limiting sleeves (7) are rotatably installed on the four groups of fixing rods (5); the four groups of the first limiting sleeves (6) and the four groups of the second limiting sleeves (7) are arranged opposite to each other; grooves (8) are provided in the four groups of the first limiting sleeves (6) and the four groups of the second limiting sleeves (7); and locking components are provided on the four groups of the first limiting sleeves (6) and the four groups of the second limiting sleeves (7).

2. The automotive high-precision current sensor according to claim 1, characterized in that: A heat sink (2) is fixedly installed in the current sensor (1), a guide groove (3) is provided in an annular shape on the inner wall of the heat sink (2), and a front end opening of the guide groove (3) is connected to the interior of the current sensor (1).

3. The high-precision automotive current sensor according to claim 1, characterized in that: The locking assembly comprises a through hole (9) and a protrusion (10), wherein the through hole (9) is provided on the first limiting sleeve (6), the protrusion (10) is fixedly mounted on the second limiting sleeve (7), the protrusion (10) is movably inserted into the through hole (9), and movable grooves (11) are symmetrically provided in the protrusion (10), springs (12) are installed in both groups of the movable grooves (11), and limiting blocks (13) are movably mounted at the openings of both groups of the movable grooves (11), and the two groups of limiting blocks (13) are in contact with the outer wall of the first limiting sleeve (6) at the opening of the through hole (9).

4. The high-precision automotive current sensor according to claim 3, characterized in that: The inner wall of the through hole (9) is funnel-shaped, and the opening diameter at the joint between the through hole (9) and the second limiting sleeve (7) is larger than the diameter of the inner wall at the opposite end.

5. The high-precision automotive current sensor according to claim 3, characterized in that: The inner walls of the two groups of grooves (8) are hexagonal in shape, and the inner walls of the two groups of grooves (8) are adapted to the front ends of the bolts (4).

6. The automotive high-precision current sensor according to claim 1, characterized in that: A snap ring (14) is fixedly mounted on the rear side of each of the first limiting sleeve (6) and the second limiting sleeve (7); a convex ring (15) is fixedly mounted on the front side of the current sensor (1); the outer wall of the convex ring (15) is in contact with the inner walls of the two groups of snap rings (14); multiple groups of insert blocks (16) are annularly mounted on the inner walls of the two groups of snap rings (14); multiple groups of slots (17) are annularly opened on the outer wall of the convex ring (15); and multiple groups of insert blocks (16) are movably inserted into the multiple groups of slots (17).

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