JP6925871B2 - Battery terminal with current sensor - Google Patents

Description

The present invention relates to a battery terminal with a current sensor formed by assembling a current sensor to the battery terminal.

In recent years, the number of electrical components has been increasing along with the sophistication of automobiles. It is known that the increase in electrical components increases the consumption of in-vehicle batteries. Therefore, conventionally, a battery terminal with a current sensor including a battery terminal connected to the battery post of the battery and a current sensor assembled to the battery terminal has been proposed (see, for example, Patent Document 1). The battery terminal 100 with a current sensor of this type includes the battery terminals 101 shown in FIGS. 3 and 4, and the battery terminal 101 includes a post portion 102 connected to the battery post and a stud portion 103 connected to the load. A plate-shaped resin-molded portion (bus bar) 104 that connects the post portion 102 and the stud portion 103 is provided, and the plate-shaped resin-molded portion 104 is subjected to magnetism generated by an electric current flowing through the plate-shaped resin-molded portion 104. A magnetic detection circuit 105 for detection is provided.

Japanese Unexamined Patent Publication No. 2012-109098

By the way, the magnetic detection circuit tends to have a large detection error at a high temperature or a low temperature due to the temperature characteristics of electronic components. In the conventional configuration, since the plate-shaped resin-molded portion 104 in which the magnetic detection circuit 105 is arranged has a flat plate shape, the cross-sectional area is relatively small and the electric resistance is large. Therefore, when the plate-shaped resin-molded portion 104 is continuously energized, the plate-shaped resin-molded portion 104 generates heat, and it is assumed that the detection error of the magnetic detection circuit 105 increases due to this heat generation.

The present invention has been made in view of the above, and an object of the present invention is to provide a battery terminal with a current sensor that suppresses heat generation of a bus bar and improves the detection accuracy of a magnetic detector.

In order to solve the above-mentioned problems and achieve the object, the present invention provides a battery in a battery terminal with a current sensor, which comprises a battery terminal made of a conductive metal plate and a current sensor assembled to the battery terminal. The terminal is arranged side by side with the post part connected to the battery post, the load connection terminal part to which the load is connected, the post part is connected to one end side, and the load connection terminal part is connected to the other end side. A linear bus bar to be connected is provided, and a current sensor is arranged on the other end side of the bus bar to detect magnetism generated by a current flowing through the bus bar, and the bus bar and the magnetic detection unit are formed by resin molding. The bus bar is provided with a current sensor main body that holds the bus bar integrally, and the bus bar is folded back so that the upper plate portion that extends linearly and the magnetic detection portion is arranged on the other end side and one end side of the upper plate portion in the longitudinal direction are folded back. A bent portion in which the side edge portion in the longitudinal direction of the upper plate portion between the portion and the magnetic detection portion and the folded portion is bent into an L-shaped cross section is provided, and the folded portion provides a gap below the upper plate portion. The lower plate portion is arranged so that the post portion is connected to the side edge portion, and one end side of the upper plate portion is bent downward to be connected to the end portion on the side far from the magnetic detection portion in the longitudinal direction of the lower plate portion. It is characterized by having a part and.

According to this configuration, since the bus bar includes a bent portion in which the side edge portion in the longitudinal direction of the bus bar is bent into an L-shaped cross section, the cross-sectional area and surface area of the bus bar can be increased by the amount of this bent portion. .. Therefore, it is possible to reduce the electric resistance of the bus bar during continuous energization and improve heat dissipation from the surface of the bus bar. As a result, the heat generation of the bus bar can be suppressed, so that the detection error of the magnetic detector can be suppressed and the detection accuracy of the magnetic detector can be improved.

In this configuration, the bent portion may be formed between the connecting portion of the post portion in the longitudinal direction of the bus bar and the magnetic detector portion. According to this configuration, the cross-sectional area and surface area of the bus bar as a current conduction path can be effectively increased.

Further, the bus bar extends along the direction in which the post portion and the load connection terminal portion are aligned, the post portion is connected to the side edge portion on one end side of the bus bar, and the load connection terminal portion is the other end of the bus bar. It may be connected to the side edge of the side. According to this configuration, the battery terminal can be formed compactly and cohesively, so that the installation area of the battery terminal with a current sensor can be reduced.

Further, the length of the bent portion in the longitudinal direction may be at least 1/2 or more of the length of the upper plate portion in the longitudinal direction.

According to the present invention, since the bus bar includes a bent portion in which the side edge portion in the longitudinal direction of the bus bar is bent into an L-shaped cross section, the cross-sectional area and surface area of the bus bar can be increased by the amount of this bent portion. .. Therefore, it is possible to reduce the electric resistance of the bus bar during continuous energization and improve heat dissipation from the surface of the bus bar. As a result, the heat generation of the bus bar can be suppressed, so that the detection error of the magnetic detector can be suppressed and the detection accuracy of the magnetic detector can be improved.

FIG. 1 is a perspective view of a battery terminal with a current sensor according to the present embodiment. FIG. 2 is a perspective view of the battery terminal included in the battery terminal with the current sensor of FIG. FIG. 3 is a perspective view of a battery terminal with a current sensor according to a conventional example. FIG. 4 is a perspective view of the battery terminal included in the battery terminal with the current sensor of FIG.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment. In addition, the components in the embodiment include those that can be easily replaced by those skilled in the art, or those that are substantially the same.

FIG. 1 is a perspective view of a battery terminal with a current sensor according to the present embodiment, and FIG. 2 is a perspective view of a battery terminal included in the battery terminal with a current sensor of FIG. In FIG. 1, reference numeral 1 indicates a battery terminal with a current sensor. The battery terminal 1 with a current sensor is not particularly limited, but is connected to, for example, a battery 2 mounted on a moving body such as an automobile, and is supplied from the battery 2 to each device (load; not shown) of the moving body. Measure the current value. The measured current value is output to the control device (ECU) of the moving body, and the remaining amount (degree of consumption) of the battery 2 is determined. As shown in FIG. 1, the battery terminal 1 with a current sensor includes a battery terminal 10 connected to a battery post 3 of the battery 2 and a current sensor 40 assembled to the battery terminal 10.

The battery 2 has an upper surface 4, a lower surface (not shown), and a plurality of side surfaces 5, and the battery post 3 is provided on the upper surface 4 so as to project. The upper surface 4 is an upright surface of the battery post 3. The battery post 3 is formed in a substantially truncated cone shape having a tapered peripheral side surface whose tip diameter is smaller than the base end diameter. In this embodiment, a battery terminal 10 that can be connected and fixed to a battery post 3 having such a shape is used.

The battery terminal 10 is formed by pressing a conductive metal plate. In this embodiment, the surface of the battery terminal 10 is Sn (tin) plated. As shown in FIG. 2, the battery terminal 10 includes a post portion 11, a load connection terminal portion 12, and a bus bar 13 and is integrally formed. The post portion 11 is a portion connected to the battery post 3 (FIG. 1), and is tightened when fixing the annular portion 14 formed in a substantially C shape in a plan view and the annular portion 14 to the battery post 3. A pair of tightening portions 15 and 16 and a connecting portion 17 for connecting the annular portion 14 to the bus bar 13 are provided. The tightening portions 15 and 16 are arranged so as to face each other with a predetermined gap, and the tightening portions 15 and 16 are provided with a tightening bolt 18 penetrating the tightening portions 15 and 16 and the tightening bolt 18. A nut 19 (both of which is shown in FIG. 1) to be screwed into is provided. By tightening the nut 19, the tightening portions 15 and 16 approach each other and the diameter of the annular portion 14 is reduced, so that the annular portion 14 is fixed to the battery post 3. The connecting portion 17 is a plate-shaped member extending from the outer surface of the annular portion 14 opposite to the tightening portions 15 and 16, and is connected to one end 13a side of the bus bar 13 described later.

The load connection terminal portion 12 is, for example, a portion to which a terminal (not shown) of a cable extending from an electrical component (load) is connected. The load connection terminal portion 12 is a plate-shaped member arranged side by side with the annular portion 14 of the post portion 11, and a hole portion 21 through which the stud bolt 20 (FIG. 1) is inserted is formed in a substantially central portion thereof. The terminal of the cable described above is connected to the stud bolt 20, and the terminal is fixed by sandwiching the terminal with the load connection terminal portion 12 with a nut (not shown) screwed into the stud bolt 20. The load connection terminal portion 12 includes a rising portion 22 that rises upward from the load connection terminal portion 12 and is connected to the other end 13b side of the bus bar 13.

The bus bar 13 is a linear plate-shaped member extending along the direction in which the post portion 11 and the load connection terminal portion 12 are arranged (X direction in the drawing), and the post portion 11 is connected to one end 13a side. The load connection terminal portion 12 is connected to the other end 13b side. That is, the post portion 11 and the load connection terminal portion 12 are electrically conductively connected to each other via the bus bar 13. The bus bar 13 includes a main body portion 26 extending in a straight line, and a folded-back portion 23 in which one end 13a side is folded downward to provide a gap at the top and bottom and overlap. The folded-back portion 23 is formed by a vertical portion 24 that is bent downward and a lower plate portion 25 that is further bent at the lower end of the vertical portion 24 in the longitudinal direction (X direction in the drawing) of the bus bar 13. The lower plate portion 25 of the folded-back portion 23 is located below the main body portion 26 of the bus bar 13, and the connecting portion 17 of the post portion 11 is connected to the side edge portion of the lower plate portion 25.

Further, the bus bar 13 has a step portion 27 in which the other end 13b side is raised upward and then horizontally bent. The step portion 27 is formed by a vertical portion 28 and a horizontal portion 29, and a rising portion 22 of the load connection terminal portion 12 is connected to a side edge portion of the horizontal portion 29. In the present embodiment, the bus bar 13 is configured to include a folded-back portion 23 and a stepped portion 27 that are connected to the main body portion 26, respectively, and the main body portion 26 is an upper plate portion with respect to the lower plate portion 25 of the folded-back portion 23.

The current sensor 40 is a current sensor main body 42 that integrally holds the current detection board 41 arranged on the other end 13b side of the bus bar 13, the current detection board 41, the bus bar 13, and the load connection terminal portion 12 by resin molding. And a connector portion 44 connected to the current sensor main body 42. The current detection board 41 is arranged at a position close to the step portion 27 on the back surface of the main body portion 26 of the bus bar 13, and mounts a magnetic detection unit 43 that detects magnetism generated by the current flowing through the bus bar 13 (main body portion 26). The magnetic detector 43 is composed of, for example, a Hall IC, and a coreless type having no core is used. The current sensor main body 42 is formed by insert molding so that the bus bar 13 and the lower surface of the load connection terminal portion 12 are filled with resin. The connector portion 44 has a plurality of terminal fittings (not shown) inside, and these terminal fittings are connected to the current detection board 41. The connector unit 44 is connected to, for example, a mating connector extending from a moving body control device (ECU), and controls the magnitude of magnetism (magnetic flux density, etc.) detected by the magnetic detection unit 43 of the current detection board 41 (ECU). ).

By the way, in the battery terminal 1 with a current sensor of the present embodiment, the magnetic detection unit 43 is arranged on the main body 26 of the bus bar 13 that connects the post unit 11 and the load connection terminal unit 12, and the magnetic detection unit 43 detects the magnetic detection unit 43. The amount of current is converted based on the magnitude of magnetism. Of course, the detection of this amount of current (magnetism) is required to be performed with high accuracy.

On the other hand, the magnetic detector 43 of the Hall IC or the like tends to have a large detection error at a high temperature or a low temperature due to the temperature characteristics of the electronic component. Further, since the battery terminal 10 is formed by pressing a metal plate, the cross-sectional area of the bus bar 13 tends to be relatively small, and the electric resistance is increased accordingly. When the electric resistance becomes large, the bus bar 13 generates heat during continuous energization, and it is assumed that the heat generation causes a problem that the detection error of the magnetic detector 43 becomes large. In order to increase the cross-sectional area of the bus bar 13, the length (width) of the bus bar 13 in the lateral direction (Y direction in the figure) can be increased, but the battery terminal and the battery terminal with a current sensor are correspondingly large. It is not realistic because the installation area becomes large.

Therefore, in this configuration, as shown in FIG. 2, the main body 26 of the bus bar 13 is formed in an L-shaped cross section by bending the side edge portion of the main body 26 in the longitudinal direction (X direction in the drawing) upward. The bent portion 30 is provided. By providing the bent portion 30, it is possible to increase the cross-sectional area and the surface area by the amount of the bent portion 30 as compared with the case where the bus bar (main body portion) is formed of the plate materials having the same thickness, the same width, and the same length. It becomes. Therefore, it is possible to reduce the electric resistance of the bus bar 13 during continuous energization and improve heat dissipation from the surface of the bus bar 13. As a result, the heat generation of the bus bar 13 can be suppressed, so that the detection error of the magnetic detection unit 43 can be suppressed and the detection accuracy of the magnetic detection unit 43 can be improved.

Further, the bent portion 30 is formed between the folded portion 23 and the magnetic detection portion 43 in the longitudinal direction of the main body portion 26 of the bus bar 13. Therefore, the cross-sectional area and surface area of the main body 26 as the current conduction path can be effectively increased, and the arrangement of the current detection substrate 41 and the magnetic detector 43 is not hindered.

In the present embodiment, the length L2 of the bent portion 30 in the longitudinal direction is preferably at least 1/2 or more of the length L1 of the main body portion 26 in the longitudinal direction. In this configuration, by sufficiently securing the length L2 of the bent portion 30, the surface area of the main body portion 26 can be increased and the heat dissipation can be improved.

Further, in the present embodiment, the bus bar 13 is provided with the above-mentioned folded-back portion 23 on one end 13a side, and the post portion 11 is connected to the side edge portion of the lower plate portion 25 of the folded-back portion 23. According to this configuration, the vertical portion 24 of the folded-back portion 23 can be most separated from the magnetic detection portion 43 arranged on the other end 13b side of the bus bar 13 (main body portion 26). Therefore, it is possible to suppress the influence of the magnetic field generated by the current flowing through the vertical portion 24 of the folded portion 23 acting on the magnetic detector 43 as a disturbance magnetic field, and it is possible to improve the detection accuracy of the magnetic detector 43.

As described above, according to the battery terminal 1 with a current sensor according to the present embodiment, the battery terminal 10 is arranged side by side on the post portion 11 connected to the battery post 3 and the post portion 11, and the load is applied. The current sensor 40 includes a load connection terminal portion 12 to be connected and a linear bus bar 13 to which the post portion 11 is connected to one end 13a side and the load connection terminal portion 12 is connected to the other end 13b side. A current that is arranged on the other end 13b side of the main body 26 of the bus bar 13 and integrally holds the bus bar 13 and the magnetic detection unit 43 by resin molding and the magnetic detection unit 43 that detects the magnetism generated by the current flowing through the bus bar 13. The bus bar 13 includes a sensor main body 42, and the bus bar 13 includes a bent portion 30 in which a side edge portion in the longitudinal direction of the main body portion 26 of the bus bar 13 is bent into an L-shaped cross section, so that the bus bar 13 has the same thickness, the same width, and the same length. It is possible to increase the cross-sectional area and the surface area by the amount of the bent portion 30 as compared with the one in which the bus bar (main body portion) is formed of the plate material of. Therefore, it is possible to reduce the electric resistance of the bus bar 13 during continuous energization and improve heat dissipation from the surface of the bus bar 13. As a result, the heat generation of the bus bar 13 can be suppressed, so that the detection error of the magnetic detection unit 43 can be suppressed and the detection accuracy of the magnetic detection unit 43 can be improved. Further, since the battery terminal 10 is reinforced by providing the bent portion 30, the mechanical strength of the battery terminal 1 with a current sensor in a state where the battery terminal 1 with a current sensor is fixed to the battery post 3 is improved.

Further, according to the present embodiment, since the bent portion 30 is formed between the folded portion 23 and the magnetic detector portion 43 in the longitudinal direction of the bus bar 13, the cross-sectional area of the main body portion 26 as the current conduction path and the cross-sectional area of the main body portion 26 The surface area can be effectively increased.

Further, according to the present embodiment, the bus bar 13 extends along the direction in which the post portion 11 and the load connection terminal portion 12 are arranged, and the post portion 11 is provided on one end 13a side of the bus bar 13 and is a folded portion. The load connection terminal portion 12 is connected to the side edge portion of the lower plate portion 25 in 23, and the load connection terminal portion 12 is connected to the side edge portion of the horizontal portion 29 in the step portion 27 provided on the other end 13b side of the bus bar 13, so that the battery The terminal 10 can be compactly and cohesively formed, and the installation area of the battery terminal 1 with a current sensor can be reduced.

Further, according to the present embodiment, the bus bar 13 includes a folded-back portion 23 in which one end 13a side of the bus bar 13 is folded downward to provide a gap above and below and overlapped, and the post portion 11 is a lower plate portion 25 in the folded-back portion 23. Since it is connected to the side edge portion of the bus bar 13, the vertical portion 24 of the folded portion 23 can be most separated from the magnetic detection portion 43 arranged on the other end 13b side of the bus bar 13. Therefore, it is possible to suppress the influence of the magnetic field generated by the current flowing through the vertical portion 24 of the folded portion 23 acting on the magnetic detector 43 as a disturbance magnetic field, and it is possible to improve the detection accuracy of the magnetic detector 43.

Although one embodiment of the present invention has been described above, the present embodiment is presented as an example and is not intended to limit the scope of the invention. This embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. The present embodiment and its modifications are included in the scope and gist of the invention, as well as in the scope of the invention described in the claims and the equivalent scope thereof. For example, the post portion 11 is not limited to the above-mentioned shape shown in FIGS. 1 and 2, and may be the shape of the conventional post portion shown in FIGS. 3 to 4.

1 Battery terminal with current sensor 3 Battery post 10 Battery terminal 11 Post part 12 Load connection terminal part 13 Bus bar 13a One end 13b Other end 14 Circular part 17 Connection part 20 Stud bolt 21 Hole part 23 Folded part 24 Vertical part 25 Lower plate part 26 Main body 27 Steps 28 Vertical part 29 Horizontal part 30 Bending part 40 Current sensor 41 Current detection board 42 Current sensor main body 43 Magnetic detector

Claims (4)

In a battery terminal with a current sensor, which comprises a battery terminal made of a conductive metal plate and a current sensor assembled to the battery terminal.
The battery terminal has a post portion connected to the battery post and a post portion.
A load connection terminal portion that is arranged side by side on the post portion and to which a load is connected,
A linear bus bar to which the post portion is connected to one end side and the load connection terminal portion is connected to the other end side is provided.
The current sensor is a current sensor that is arranged on the other end side of the bus bar and integrally holds the bus bar and the magnetic detection unit by resin molding, and a magnetic detector that detects magnetism generated by the current flowing through the bus bar. With the main body,
The bus bar includes an upper plate portion that extends linearly and the magnetic detection portion is arranged on the other end side, a folded portion that is folded back at one end side in the longitudinal direction of the upper plate portion, and the magnetic detection portion. A bent portion in which the side edge portion in the longitudinal direction of the upper plate portion between the folded portion and the folded portion is bent in an L-shaped cross section is provided, and the folded portion is arranged with a gap below the upper plate portion. , The lower plate portion to which the post portion is connected to the side edge portion and the one end side of the upper plate portion are bent downward to be connected to the end portion on the side far from the magnetic detector portion in the longitudinal direction of the lower plate portion. A battery terminal with a current sensor, characterized by having a vertical section. The battery terminal with a current sensor according to claim 1, wherein the bent portion is formed between a connecting portion of the post portion and the magnetic detection portion in the longitudinal direction of the bus bar. The bus bar extends along the direction in which the post portion and the load connection terminal portion are aligned, the post portion is connected to a side edge portion on one end side of the bus bar, and the load connection terminal portion is connected to the load connection terminal portion. The battery terminal with a current sensor according to claim 1 or 2, wherein the battery terminal is connected to a side edge portion on the other end side of the bus bar. The current sensor according to any one of claims 1 to 3, wherein the length of the bent portion in the longitudinal direction is at least ½ or more of the length of the upper plate portion in the longitudinal direction. Battery terminal.

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