JP5718396B2 - Battery terminal - Google Patents

Description

  The present invention relates to a battery terminal having a shunt resistor used for a current sensor.

  Conventionally, a battery terminal connected to the battery post is manufactured by die casting or by processing a steel plate. In addition, a current sensor for measuring a battery current is installed in a battery terminal. Although a shunt resistor is used for the current sensor, it is strongly desired to firmly fix the shunt resistor to the battery terminal, to reduce the size and weight, and to improve reliability and workability.

  As an example of a conventional battery terminal, Patent Document 1 describes a battery terminal that is manufactured by die casting and a shunt resistor is bonded to a material (such as brazing or welding). In addition, a battery terminal manufactured by die casting is known in which a shunt resistor is fixed by bolt fastening.

  As another example of a conventional battery terminal, in Patent Documents 2 and 3, the battery terminal (bus bar) is formed by press-molding a flat steel material. For the steel material forming the battery terminal, for example, a copper alloy such as a copper manganese alloy or a copper nickel alloy is used. The current sensors described in Patent Documents 2 and 3 have a structure in which the shunt resistor is formed of the same steel plate as the battery terminal and integrated. Moreover, what shunt resistance was formed with another steel material, and this was fixed to the battery terminal by bolt fastening is also known.

Special table 2010-505103 gazette JP 2012-220249 A JP 2005-129379 A

  However, when the shunt resistor is connected to the battery terminal by material joining such as bolt fastening or brazing as in Patent Document 1, there is a problem that the number of parts increases and it is difficult to reduce the weight and size. In the connection between the battery terminal and the shunt resistor, the number of members increases because the intermediate member is interposed, and it is not easy to ensure the electrical connection reliability and the mechanical connection reliability. Moreover, although the connection work of a battery terminal and shunt resistance is needed, there also exists a problem that the workability | operativity of an assembly or assembly is also low. On the other hand, in the structure in which the battery terminal and the shunt resistor are integrated as in Patent Documents 2 and 3, etc., there is a problem that sufficient rigidity cannot be obtained and its manufacture is not easy.

  The present invention has been made to solve these problems, and an object of the present invention is to provide a battery terminal having a high rigidity that is easy to manufacture by integrating a bus bar partly used for a shunt resistor. To do.

  A first aspect of the battery terminal of the present invention is a battery terminal attached to a battery post, having a post opening for inserting the battery post and fixed to the battery post, A bus bar having a resistance portion used for a shunt resistor for measuring current, and the post connection body is manufactured by die casting by casting a portion other than the resistance portion at one end of the bus bar. It is characterized by.

  Another aspect of the battery terminal of the present invention is characterized in that a notch is formed at one end of the bus bar.

  Another aspect of the battery terminal of the present invention is characterized in that one end of the bus bar is formed in a disk shape or an arc shape that circulates around the inner periphery of the post opening.

  In another aspect of the battery terminal of the present invention, the bus bar is arranged such that two planes including each of two end faces in the longitudinal direction of the resistance portion intersect or contact the post opening. The resistance portion is arranged so as not to contact the battery post, and the distance from the battery post is shorter than the distance from one end in the longitudinal direction of the bus bar to the resistance portion. .

  In another aspect of the battery terminal according to the present invention, the post opening is formed in a tapered shape so as to be in close contact with the battery post.

  Another aspect of the battery terminal of the present invention is characterized in that the bus bar is formed of copper or a copper alloy at least other than the resistance portion.

  Another aspect of the battery terminal of the present invention is characterized in that the resistance portion is formed of a copper alloy made of copper, manganese, and nickel.

  Another aspect of the battery terminal of the present invention is characterized in that the bus bar is plated to enhance electrical connectivity except for the resistance portion.

  Another aspect of the battery terminal of the present invention is characterized in that the post connection body is made of brass.

  Another aspect of the battery terminal according to the present invention is characterized in that the bus bar has a harness connecting portion in which an opening for connecting a wire harness is formed at the other end.

  Another aspect of the battery terminal according to the present invention is characterized in that the bus bar has a harness connection portion in which a connection protrusion for connecting a wire harness is formed at the other end.

  Another aspect of the battery terminal of the present invention is characterized in that the connection protrusion is manufactured by die casting when the post connection body is manufactured.

  Another aspect of the battery terminal according to the present invention is characterized in that the connection protrusion is cast on the other end side of the bus bar as a cast fitting when the post connector is manufactured.

  Another aspect of the battery terminal according to the present invention is characterized in that the bus bar has a terminal portion for connecting a circuit board for measuring a voltage generated in the resistance portion.

  Another aspect of the battery terminal of the present invention is characterized in that the resistance portion and the harness connection portion are covered with resin molding or resin molding.

  According to the present invention, it is possible to provide a battery terminal having high rigidity that is easy to manufacture by integrating a bus bar, a part of which is used for shunt resistance.

It is a perspective view which shows the structure of the battery terminal of 1st Embodiment of this invention. It is a top view which shows the structure of the bus bar with which the battery terminal of 1st Embodiment of this invention is provided. It is the perspective view and top view which show the structure of the battery terminal of 2nd Embodiment of this invention. It is a perspective view which shows the structure of the battery terminal of 3rd Embodiment of this invention. It is a top view which shows the structure of the bus bar with which the battery terminal of 3rd Embodiment of this invention is provided. It is a perspective view which shows the structure of the battery terminal of 4th Embodiment of this invention. It is a top view which shows the structure of the bus bar with which the battery terminal of 4th Embodiment of this invention is provided.

  A battery terminal according to a preferred embodiment of the present invention will be described in detail with reference to the drawings. In addition, about each structural part which has the same function, the same code | symbol is attached | subjected and shown for simplification of illustration and description.

(First embodiment)
A battery state detection sensor or the like that monitors the battery state includes a current sensor for detecting the battery current. A battery terminal is attached to the battery post to draw current from the battery, but the current sensor connects a shunt resistor to the battery terminal to measure the current flowing through the battery terminal and measures the voltage drop caused by it. ing. The battery terminal of the present invention has a structure in which the shunt resistor is firmly fixed and integrated.

  A battery terminal according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a perspective view showing the configuration of the battery terminal 100 of the present embodiment. The battery terminal 100 of the present embodiment includes a post connection body 110 and a bus bar 120, and one end of the bus bar 120 is inserted and fixed inside the post connection body 110.

  The post connection body 110 has a post opening 111 for mounting on the battery post and a bus bar connection 112 for projecting the bus bar 120 to the outside. One end of the bus bar 120 is fixed inside the post connection body 110, and the other end protrudes from the bus bar connection portion 112 to the outside.

  In order to fix one end of the bus bar 120 to the inside of the post connector 110, the battery terminal 100 of the present embodiment is manufactured by die-casting the post connector 110, and one end of the bus bar 120 manufactured in advance is It is fixed by insert (casting) into the mold during die casting.

  The configuration of the bus bar 120 is shown in FIG. FIG. 2 is a plan view showing a configuration of the bus bar 120 included in the battery terminal 100 of the present embodiment. The bus bar 120 includes a resistance part 122 used for shunt resistance, and a first conductor part 121 and a second conductor part 123 connected so as to sandwich the resistance part 122, and before the post connector 110 is manufactured by die casting. This is manufactured.

  The bus bar 120 can be formed of, for example, a copper compound. For example, the first conductor 121 and the second conductor 123 are formed of copper, and the resistor 122 is formed of a copper alloy made of copper, manganese, and nickel. Can do. Manganin (registered trademark) is exemplified as a copper alloy made of copper, manganese, and nickel. When the first conductor portion 121 and the second conductor portion 123 are made of copper and the resistance portion 122 is a copper alloy such as manganin, a good bond between them can be obtained, and the electrical, thermal, and Mechanical connection reliability can be improved. Note that the bus bar 120 may be formed only of a copper plate.

The first conductor portion 121 formed on one end side of the bus bar 120 has its end portion fixed inside the post connector 110. An end portion of the first conductor portion 121 fixed inside the post connection body 110 is formed in a complicated shape by forming a notch portion 125. By forming the end portion of the first conductor portion 121 in such a complicated shape, an anchor effect that the end portion of the first conductor portion 121 is firmly fixed inside the post connector 110 can be obtained. In FIG. 2, the rectangular cutout 125 is formed at the end of the first conductor 121. However, the shape of the cutout 125 is not limited to this, and other shapes such as a curved shape are used. It may be formed.
In addition, since the first conductor portion 121 and the second conductor portion 123 of the bus bar 120 are made of copper and the post connection body 110 is made of brass, the metal properties are close and compatible, so the degree of coupling for coupling each other. There is an advantage that becomes high.

  The second conductor portion 123 formed on the other end side of the bus bar 120 is provided with a harness connection portion 123a for connecting a wire harness. The harness connecting portion 123a is provided with a bus bar opening 123b for screwing the wire harness. The shapes of the harness connection portion 123a and the bus bar opening portion 123b are not limited to this, and can be formed in a shape suitable for the connection of the wire harness.

  The resistance part 122 is different in resistance value from the first conductor part 121 and the second conductor part 123 on both sides thereof. The current sensor is configured to measure a current value of the battery mainly by measuring a voltage drop in the resistance unit 122. Terminal portions 131 and 132 are provided on the first conductor portion 121 and the second conductor portion 123 with the resistor portion 122 interposed therebetween, and the circuit board of the current sensor is connected thereto. The distance between the terminal portions 131 and 132 is preferably shorter from the viewpoint of reducing the resistance value variation factor. For example, as shown in FIG. 2, it is preferable to arrange the terminal portions 131 and 132 so as to face each other with the resistance portion 122 interposed therebetween, but it is possible to appropriately change according to the arrangement of other components.

  The battery terminal 100 according to the present embodiment is configured such that the post connection body 110 on one end side is attached to and electrically connected to the battery post, and the wire harness is connected to the bus bar opening 123b of the bus bar 120 on the other end side. It has a function as a conductor that conducts current from the wire harness to the wire harness, that is, a bus bar. At the same time, the battery terminal 100 fixes or supports one end of the wire harness connected to the circuit board of the current sensor connected to the bus bar 120 or the harness connection part 123a by fixing the post connector 110 to the battery post. It also has a function as a structure.

  The post opening 111 of the post connector 110 is formed in a cylindrical shape through which the battery post can be inserted. When the battery post is tapered, the post opening 111 can also be tapered. As a result, the electrical connection can be enhanced by being brought into close contact with the battery post.

  The bus bar 120 may be plated to improve electrical connectivity. Moreover, you may resin-mold or resin-mold so that the resistance part 122 and the 2nd conductor part 123 which are the parts exposed from the post connection body 110 of the bus-bar 120 may be covered.

  According to the battery terminal 100 of this embodiment, the bus bar 120 can be integrated and the post connector 110 can be manufactured by die casting, and a battery terminal that is easy to manufacture and has high rigidity can be provided. Moreover, it can be configured with a small number of parts, and it is easy to reduce the weight and size. Thereby, assembling property can be improved, an assembling man-hour (work man-hour) can be reduced, and cost reduction can be achieved. Moreover, electrical and mechanical connection reliability can be improved. Furthermore, although heat is generated when there is resistance at the connection portion between the post connection body 110 and the bus bar 120, in the battery terminal 100 of this embodiment, the bus bar 120 is inserted into the post connection body 110, so that heat is easily released. It has high heat dissipation and high thermal conductivity.

(Second Embodiment)
A battery terminal according to a second embodiment of the present invention will be described with reference to FIG. Fig.3 (a) is a perspective view which shows the structure of the battery terminal 200 of this embodiment, FIG.3 (b) is a top view. The battery terminal 200 of the present embodiment includes a post connection body 210 and a bus bar 220. Instead of the bus bar opening 123b provided in the harness connection part 123a of the bus bar 120 of the first embodiment, a harness connection part 223a is provided. The connection projection 223b is provided in the.

  In the battery terminal 200 of the present embodiment, one end of the wire harness is connected to the connection protrusion 223b. The connection protrusion 223b can be molded by die casting. For example, when the post connection body 210 is manufactured by die casting, it may be molded at the same time. Alternatively, the connection protrusion 223b can be a cast metal fitting and may be insert-molded into the harness connection portion 223a during die casting manufacturing.

  In the battery terminal 200 of the present embodiment, the relative positional relationship between the post connector 210 and the bus bar 220 is different from that of the battery terminal 100 of the first embodiment. In the battery terminal 100 of the first embodiment, the longitudinal direction of the bus bar 120 substantially coincides with the radial direction of the post opening 111 of the post connector 110. However, in the battery terminal 200 of the present embodiment, the bus bar 220 is opened to the post opening. Arranged adjacent to the portion 211. According to the present embodiment, the bus bar 220 including the harness connection part 223a can be disposed around the post connection body 210, and the entire current sensor can be formed compactly around the post connection body.

  As a relative positional relationship between the post connector 210 and the bus bar 220, it is preferable to arrange them so as to satisfy the following conditions. That is, it is preferable that the resistance portion 222 provided on the bus bar 220 overlaps the post opening 211 when viewed in a direction perpendicular to the longitudinal direction of the bus bar 220. More specifically, two planes including two end surfaces (boundary surfaces between the first conductor portion 221 and the second conductor portion 223) 222a and 222b in the longitudinal direction of the resistor portion 222 are respectively formed as post opening portions 211 and It should be arranged to intersect or touch.

In FIG. 3B, for ease of explanation, when the arrangement of the post openings 211 is changed based on the position of the resistor 222, the end face 222a of the resistor 222 when the post openings are at the position 211-a. Is in contact with the post opening 211 and the end face 222 b intersects the post opening 211. When the post opening is at the position 211-b, the end surface 222 b of the resistance portion 222 is in contact with the post opening 211 and the end surface 222 a intersects the post opening 211. Therefore, when the post opening 211 is positioned between 211-a and 211-b, two planes including the two end surfaces 222a and 222b of the resistor 222 intersect the post opening 211 or Arranged to touch. It is not preferable from the viewpoint of space saving that the post opening 211 is disposed at the position of the broken line shown in FIG.
In addition, it is preferable that the resistor portion 222 is not in contact with the battery post and is disposed such that the distance from the battery post is shorter than the distance from one end in the longitudinal direction of the bus bar 220 to the resistor portion 222. Since the resistance portion 222 does not come into contact with the battery post, the resistance portion 222 can function. Further, by arranging the distance from the battery post to be shorter than the distance from one end in the longitudinal direction of the bus bar 220 to the resistance portion, that is, the length of the first conductor portion 221 or the second conductor portion 223, the size can be reduced. Can be planned.

  In the battery terminal 200 shown in FIG. 3, a bus bar connection part 212 for projecting the bus bar 220 is provided on the substantially right half of the post connection body 210. Then, one end (right side of the drawing) of the bus bar 220 is inserted into the inside from the bus bar connection portion 212, and the other end provided with the connection protrusion 223b is arranged to be on the left side of the drawing.

  Also in the battery terminal 200 of the present embodiment, the bus bar 220 is produced in advance, and the bus bar 220 is inserted (cast) into a mold when the post connector 210 is manufactured by die casting. In the present embodiment, the connection projection 223b can be manufactured by die casting simultaneously with the post connection body 210. Or you may insert-mold to the harness connection part 223a at the time of die-cast manufacture by making the connection protrusion 223b into a casting metal fitting.

  In the battery terminal 200 shown in FIG. 3, the bus bar connection portion 212 for projecting the bus bar 220 to the outside is provided in the substantially right half of the post connection body 210. You may provide in the substantially left half of the connection body 210. FIG. In the battery terminal 200 of the present embodiment, the connection direction of the post connector 210 and the bus bar 220 may be either left or right, and for example, may be arranged so as to be mirror-symmetric with the battery terminal 200 shown in FIG.

  Also in the battery terminal 200 of the present embodiment, the bus bar 220 can be manufactured integrally with the post connector 210, and a battery terminal that is easy to manufacture and has high rigidity can be provided. In addition, effects such as weight reduction, downsizing, reduction in assembly man-hour (work man-hour), improvement in electrical and mechanical connection reliability, and the like can be obtained. Furthermore, high heat dissipation and high thermal conductivity can be obtained.

(Third embodiment)
A battery terminal according to a third embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a perspective view showing the configuration of the battery terminal of the present embodiment. FIG. 5 is a plan view showing the configuration of the bus bar provided in the battery terminal of the present embodiment. The bus bar 320 (320a, 320b) provided in the battery terminal 300 (300a, 300b) of the present embodiment has a shape bent leftward or rightward in the middle of the longitudinal direction.

  In the bus bar 320a shown in FIGS. 4A and 5A, the first conductor portion 321a is bent at a substantially right angle in the left direction in the middle of the longitudinal direction when viewed from the post connector 310 side. Further, in the bus bar 320b shown in FIGS. 4B and 5B, the first conductor portion 321b is bent at a substantially right angle in the right direction in the middle of the longitudinal direction when viewed from the post connector 310 side. The bus bars 320a and 320b are formed in a shape that is mirror-symmetric with respect to each other.

  In the battery terminal 300 of the present embodiment, the bus bar 320 is bent to reduce the size.

(Fourth embodiment)
A battery terminal according to a fourth embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a perspective view showing the configuration of the battery terminal of the present embodiment. FIG. 7 is a plan view showing the configuration of the bus bar provided in the battery terminal of the present embodiment. The bus bar 420 provided in the battery terminal 400 of the present embodiment has a circumferential portion 421a in which one end of the first conductor portion 421 is formed in a cylindrical shape.

  The circumferential portion 421a is formed in a shape that circulates around the inner circumference of the post opening 411, and is inserted when the post connector 410 is manufactured by die casting. The inner surface of the rotating portion 421a is preferably formed so as to be exposed from the post connection body 410, whereby the bus bar 420 is directly connected to the battery post, and the electrical connection reliability can be improved. . In addition, the bus bar 420 is directly supported by the battery post, and the mechanical connection reliability is also improved.

  The shape of the surrounding portion 421a of the first conductor portion 421 is not limited to the cylindrical shape that goes around the battery post as shown in FIGS. 6 and 7A. As an example, as shown in FIGS. 7B and 7C, the circular portion 421a may be formed in a shape cut at a predetermined position of the cylinder. Or as shown in FIG.7 (d), you may form the surrounding part 421a in circular arc shape so that only a part of battery post may circulate.

  In addition, the description in this Embodiment shows an example of the battery terminal which concerns on this invention, and is not limited to this. The detailed configuration and detailed operation of the battery terminal in the present embodiment can be appropriately changed without departing from the spirit of the present invention.

100, 200, 300, 400 Battery terminal 110, 210, 310, 410 Post connection body 111, 211, 411 Post opening part 112, 212 Bus bar connection part 120, 220, 320, 420 Bus bar 121, 221, 321, 421 First Conductor parts 122, 222, 322, 422 Resistor parts 123, 223, 323, 423 Second conductor parts 123a, 223a Harness connection part 123b Bus bar opening part 125 Notch part 131, 132 Terminal part 223b Connection protrusion

Claims (15)

A battery terminal attached to the battery post,
A post connection body which has a post opening for inserting the battery post and is fixed to the battery post;
A bus bar having a resistance portion used as a shunt resistor for measuring current,
The post connection body is manufactured by die casting by casting a portion other than the resistance portion at one end of the bus bar. The battery terminal according to claim 1, wherein a notch portion is formed at one end of the bus bar. 2. The battery terminal according to claim 1, wherein one end of the bus bar is formed in a disk shape or an arc shape that goes around an inner periphery of the post opening. The bus bar is arranged such that two planes including each of two end faces in the longitudinal direction of the resistance portion intersect or contact the post opening,
The said resistance part is arrange | positioned so that the distance from the said battery post may be shorter than the distance from the one end of the longitudinal direction of the said bus bar to the said resistance part, without contacting the said battery post. Item 3. The battery terminal according to Item 1 or 2. The battery terminal according to any one of claims 1 to 4, wherein the post opening is formed in a tapered shape so as to be in close contact with the battery post. 6. The battery terminal according to claim 1, wherein the bus bar is formed of copper or a copper alloy at least other than the resistance portion. The battery terminal according to claim 1, wherein the resistance portion is formed of a copper alloy made of copper, manganese, and nickel. The battery terminal according to any one of claims 1 to 7, wherein the bus bar is plated to enhance electrical connectivity except for the resistance portion. The battery terminal according to claim 1, wherein the post connection body is made of brass. The battery terminal according to any one of claims 1 to 9, wherein the bus bar has a harness connecting portion in which an opening for connecting a wire harness is formed at the other end. The battery terminal according to any one of claims 1 to 9, wherein the bus bar has a harness connection portion in which a connection projection for connecting a wire harness is formed at the other end. The battery terminal according to claim 11, wherein the connection protrusion is manufactured by die casting when the post connection body is manufactured. The battery terminal according to claim 11, wherein the connection protrusion is cast on the other end side of the bus bar as a cast metal when the post connection body is manufactured. The battery terminal according to any one of claims 1 to 13, wherein the bus bar has a terminal portion for connecting a circuit board for measuring a voltage generated in the resistance portion. The battery terminal according to claim 11, wherein the resistance portion and the harness connection portion are covered with resin molding or resin molding.

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