Current sensing unit and vehicle

Abstract

A current sensing unit and a vehicle, the current sensing unit including: a current sensing element configured to sense an intensity of a current flowing through a busbar; the magnetic shielding body at least partially surrounds to form a shielding space, the busbar and the current sensing element are located in the shielding space, and the magnetic shielding body comprises a main body part; the two extending parts extend from the two ends of the main body part respectively; the two chamfer parts are respectively positioned between the main body part and the two extension parts; and two fixing clips respectively disposed near the two chamfered portions, the fixing clips made of an elastic material and configured to contact and press the chamfered portions to fix the magnetic shield relative to the busbar.

Description

TECHNICAL FIELD

[0001] The utility model relates to a current sensing unit, more particularly, to a current sensing unit for use in a vehicle. BACKGROUND

[0002] The current sensing unit obtains the current intensity by sensing the magnetic field generated by the current around it, so it needs a magnetic shielding body to gather the magnetic field generated by the current to be measured and prevent the interference of external magnetic field on the current measurement.

[0003] In the prior art, the magnetic shielding body is fixed by the way of gluing, but the fixing process cannot be completed until the adhesive solidifies, which is not conducive to production efficiency. Moreover, the stability of the fixed magnetic shielding body is relatively poor, and once the magnetic shielding body is not well fixed and produces some deviation, it will cause a certain deviation in the current sensing result.

[0004] Therefore, it is desirable to propose a current sensing unit to improve the defects in the prior art. SUMMARY

[0005] According to a first aspect of the utility model, a current sensing unit is provided, comprising: a current sensing element configured to sense the intensity of the current flowing through the busbar; a magnetic shielding body at least partially surrounding a shielding space, the busbar and the current sensing element being located in the shielding space, the magnetic shielding body comprising: a main body portion; two extension portions respectively extending from both ends of the main body portion; two chamfered portions respectively located between the main body portion and the two extension portions; and two fixing clamps respectively arranged near the two chamfered portions, the fixing clamps being made of elastic material and configured to contact and press the chamfered portions to fix the magnetic shielding body relative to the busbar.

[0006] According to the scheme, the magnetic shielding body is fixed by the fixing clamps, which avoids the reduction of production efficiency caused by waiting for the adhesive to solidify, and improves the reliability of the fixing of the magnetic shielding body, thereby improving the measurement reliability of the current sensing unit on the current.

[0007] In some schemes, the fixing clamps can have a rounded portion and a straight portion, the shape of the rounded portion cooperates with the shape of the chamfered portion to enable the rounded portion to contact the chamfered portion, and the straight portion is adjacent to the extension portion and has a gap with the extension portion.

[0008] According to the scheme, the rounded portion of the fixing clamp is used to fix the magnetic shielding body by applying a pressing force to the chamfered portion of the magnetic shielding body, and the gap between the straight portion of the fixing clamp and the extension portion of the magnetic shielding body facilitates the installation of the magnetic shielding body.

[0009] In some schemes, the radius of curvature of the rounded portion can be equal to the radius of curvature of the chamfered portion.

[0010] According to this scheme, different fixing clips can be designed according to different shapes of the magnetic shielding body, so that the shape of the fixing clip is suitable for fixing the corresponding magnetic shielding body.

[0011] In some schemes, the current sensing unit can further include a receiving portion, and the fixing clip is received in the receiving portion.

[0012] According to this scheme, the fixing clip can be arranged in the receiving portion, and the receiving portion facilitates the elastic deformation of the fixing clip to store part of the elastic potential energy, and the stored elastic potential energy is utilized to apply an elastic force to the magnetic shielding body to fix the magnetic shielding body.

[0013] In some schemes, the current sensing unit can further include an insulating layer, the insulating layer is arranged to at least partially surround the bus bar, and the insulating layer is made of a plastic material.

[0014] According to this scheme, the insulating layer ensures the insulation between the bus bar and the magnetic shielding body, preventing the flow of undesired current between the bus bar and the magnetic shielding body.

[0015] In some schemes, the current sensing unit can further include a boss, the boss is arranged between the insulating layer and the magnetic shielding body, and the boss is configured to support the magnetic shielding body.

[0016] In some schemes, the magnetic shielding body and the fixing clip can have a symmetrical shape.

[0017] In some schemes, the magnetic shielding body can be fixed relative to the bus bar by an adhesive.

[0018] In some schemes, the current sensing element can be a Hall element.

[0019] According to a second aspect of the present application, a vehicle is provided, which includes the current sensing unit according to the first aspect of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 A schematic perspective view of a current sensing unit according to an embodiment of the present application is shown;

[0021] Figure 2 A schematic cross-sectional view of a current sensing unit according to an embodiment of the present application is shown.

[0022] Figure 3 A schematic perspective view of a magnetic shielding body according to an embodiment of the present application is shown.

[0023] REFERENCE NUMERALS:

[0024] 100 current sensing unit

[0025] 110 bus bar

[0026] 120 Current sensing element

[0027] 130 Magnetic Shielding

[0028] 132 Main Body

[0029] 134 Extension

[0030] 136 Chamfered section

[0031] 140 Fixing Clip

[0032] 142 Rounded corners

[0033] 144 Straight Line Section

[0034] 150-unit capacity

[0035] 160 insulation layer

[0036] 170 convex platform Detailed Implementation

[0037] To make the objectives, solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Unless otherwise stated, the terms used herein have their ordinary meanings in the art. The same reference numerals in the drawings represent the same parts.

[0038] Figure 1 and Figure 2 Schematic perspective and cross-sectional views of a current sensing unit 100 according to an embodiment of the present invention are shown respectively. The current sensing unit 100 mainly includes a current sensing element 120 and a magnetic shield 130. The current sensing element 120 is configured to sense the intensity of the current flowing through the bus 110. The current sensing element 120 can be, for example, a Hall element, but the present invention is not limited thereto; the current sensing element 120 can also be any other current sensing device capable of measuring the current intensity by sensing the magnetic field generated around the current to be measured. The magnetic shield 130 is used to concentrate the magnetic field generated by the current to be measured and to prevent adverse interference from external magnetic fields to the current sensing results. The magnetic shield 130 at least partially surrounds and forms a shielded space within which the bus 110 and the current sensing element 120 are located, such that the current sensing element 120 can only sense the magnetic field generated by the bus 110 and is not affected by magnetic fields outside the shielded space. Figure 3As shown, the magnetic shield 130 can have a U-shaped form, including a main body portion 132 and two extension portions 134 extending from two ends of the main body portion 132, respectively. The magnetic shield 130 further includes two chamfered portions 136 between the main body portion 132 and the two extension portions 134, respectively.

[0039] In the prior art, the magnetic shield 130 is fixed by means of gluing, but the fixing process needs to wait for the adhesive to solidify for a certain period of time, which is not conducive to production efficiency. Moreover, the stability of the gluing fixing is relatively poor, and once the magnetic shield 130 produces some deviation due to not being well fixed, it will cause a certain deviation to the current sensing result.

[0040] Therefore, the current sensing unit 100 according to the embodiments of the present application further includes two fixing clamps 140 made of elastic material and configured to contact and press the chamfered portions 136 of the magnetic shield 130 to fix the magnetic shield 130 relative to the busbar 110 by elastic force. By fixing the magnetic shield 130 by the fixing clamps 142, the reduction of production efficiency caused by waiting for the adhesive to solidify is avoided, and the reliability of the fixing of the magnetic shield 130 is improved, thereby improving the measurement reliability of the current sensing unit 100 on the current.

[0041] Preferably, the fixing clamp 140 can have a rounded portion 142 and a straight portion 144, the shape of the rounded portion 142 of the fixing clamp 140 is matched with the shape of the chamfered portion 136 of the magnetic shield 130 so that the rounded portion 142 of the fixing clamp 140 can contact the chamfered portion 136 of the magnetic shield 130, and the rounded portion 142 of the fixing clamp 140 is used to fix the magnetic shield 130 by applying a pressing force to the chamfered portion 136 of the magnetic shield 130. In addition, the straight portion 144 of the fixing clamp 140 is adjacent to the extension portion 134 of the magnetic shield 130 and there is a gap between the straight portion 144 of the fixing clamp 140 and the extension portion 134 of the magnetic shield 130, and the gap between the straight portion 144 of the fixing clamp 140 and the extension portion 134 of the magnetic shield 130 facilitates the installation of the magnetic shield 130.

[0042] Preferably, the radius of curvature of the rounded portion 142 of the fixing clip 140 can be equal to the radius of curvature of the chamfered portion 136 of the magnetic shielding body 130. Different fixing clips 140 can be designed according to different shapes of the magnetic shielding body 130, so that the shape of the fixing clip 140 is suitable for fixing the corresponding magnetic shielding body 130. For example, for the magnetic shielding body 130 with a larger radius of curvature of the chamfered portion 136, the fixing clip 140 can be designed with a larger radius of curvature of the rounded portion 142 accordingly; for the magnetic shielding body 130 with a smaller radius of curvature of the chamfered portion 136, the fixing clip 140 can be designed with a smaller radius of curvature of the rounded portion 142 accordingly.

[0043] Preferably, the current sensing unit 100 can further comprise a receiving portion 150, in which the fixing clip 140 is received. The fixing clip 140 can be arranged in the receiving portion 150, and the receiving portion 150 facilitates the elastic deformation of the fixing clip 140 to store part of the elastic potential energy, and then utilizes the stored elastic potential energy to apply an elastic force to the magnetic shielding body 130 to fix the magnetic shielding body 130.

[0044] Preferably, the current sensing unit 100 can further comprise an insulating layer 160, which is arranged to at least partially surround the busbar 110, and the insulating layer 160 is made of a plastic material. The insulating layer 160 ensures the insulation between the busbar 110 and the magnetic shielding body 130, preventing the flow of undesired current between the busbar 110 and the magnetic shielding body 130.

[0045] In addition, the current sensing unit 100 can further comprise a boss 170, which is arranged between the insulating layer 160 and the magnetic shielding body 130, and the boss 170 is configured to support the magnetic shielding body 130.

[0046] Preferably, the magnetic shielding body 130 and the fixing clip 140 can have a symmetrical shape. The symmetrical shape of the fixing clip 140 is conducive to ensuring that the magnetic shielding body 130 is also in a symmetrical configuration, which is important for the accuracy of current sensing, because once the magnetic shielding body 130 is not in a symmetrical configuration (for example, the left extension portion 134 is higher than the right extension portion 134, or the right extension portion 134 is higher than the left extension portion 134), the magnetic concentration effect of the magnetic shielding body 130 will be greatly reduced.

[0047] Preferably, the magnetic shielding body 130 can also be fixed relative to the busbar 110 by an adhesive. The magnetic shielding body 130 is fixed by the double action of the fixing clip 140 and the adhesive, making the fixation of the magnetic shielding body 130 more reliable, thereby making the measurement of current by the current sensing unit 100 more reliable.

[0048] The current sensing unit 100 according to the embodiment of the utility model is particularly suitable for use in a vehicle, because the position of the magnetic shielding body 130 is made more stable by the provision of the fixing clamp 140, so that the magnetic shielding body 130 is not easily changed in position relative to the busbar 110 due to sudden acceleration or deceleration of the vehicle in motion and the like, thereby ensuring the accuracy of current signal measurement by the current sensing unit 100.

[0049] The utility model discloses multiple exemplary embodiments in detail with reference to preferred embodiments, however, those skilled in the art can understand that various modifications and modifications can be made to the above specific embodiments without departing from the concept of the utility model, and various technical features and structures proposed by the utility model can be combined without exceeding the protection scope of the utility model, and the protection scope of the utility model is determined by the appended claims.

Claims

1. A current sensing unit, characterized by, Comprising: a current sensing element configured to sense an intensity of a current flowing through a bus bar; a magnetic shield at least partially surrounding a shield space, the bus bar and the current sensing element being located in the shield space, the magnetic shield comprising: a main body portion; two extension portions respectively extending from both ends of the main body portion; two chamfer portions respectively located between the main body portion and the two extension portions; and 2. The current sense unit of claim 1, wherein, two fixing clips respectively arranged near the two chamfer portions, the fixing clips being made of an elastic material and configured to contact and press the chamfer portions to fix the magnetic shield relative to the bus bar.

3. The current sense cell of claim 2, wherein, The fixing clip has a rounded portion and a straight portion, the rounded portion is shaped to match the chamfer portion so that the rounded portion can contact the chamfer portion, and the straight portion is adjacent to the extension portion and has a gap with the extension portion.

4. The current sense cell of claim 1, wherein, The radius of curvature of the rounded portion is equal to the radius of curvature of the chamfer portion.

5. The current sense cell of claim 1, wherein, Further comprising a receiving portion in which the fixing clip is received.

6. The current sense unit of claim 5, wherein, Further comprising an insulating layer arranged to at least partially surround the bus bar, the insulating layer being made of a plastic material.

7. The current sense cell of claim 1, wherein, Further comprising a boss arranged between the insulating layer and the magnetic shield, the boss being configured to support the magnetic shield.

8. The current sense cell of claim 1, wherein, The magnetic shield and the fixing clip have a symmetrical shape.

9. The current sense cell of claim 1, wherein, The magnetic shield is further fixed relative to the bus bar by an adhesive.

10. A vehicle characterized by comprising: The current sensing element is a Hall element. Comprising the current sensing unit according to any one of claims 1 to 9.

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