CN117054718A - Current detection device - Google Patents

Current detection device Download PDF

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Publication number
CN117054718A
CN117054718A CN202310519923.7A CN202310519923A CN117054718A CN 117054718 A CN117054718 A CN 117054718A CN 202310519923 A CN202310519923 A CN 202310519923A CN 117054718 A CN117054718 A CN 117054718A
Authority
CN
China
Prior art keywords
substrate
connection
holding member
shunt resistor
terminal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310519923.7A
Other languages
Chinese (zh)
Inventor
冲拓也
知屋城悠希
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yazaki Corp
Original Assignee
Yazaki Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yazaki Corp filed Critical Yazaki Corp
Publication of CN117054718A publication Critical patent/CN117054718A/en
Pending legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/146—Measuring arrangements for current not covered by other subgroups of G01R15/14, e.g. using current dividers, shunts, or measuring a voltage drop
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/20—Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
    • G01R1/203—Resistors used for electric measuring, e.g. decade resistors standards, resistors for comparators, series resistors, shunts
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4285—Testing apparatus
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
    • H01R12/50—Fixed connections
    • H01R12/51—Fixed connections for rigid printed circuits or like structures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/46—Bases; Cases
    • H01R13/502—Bases; Cases composed of different pieces
    • H01R13/512—Bases; Cases composed of different pieces assembled by screw or screws
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
  • Mounting Of Printed Circuit Boards And The Like (AREA)

Abstract

The invention provides a current detection device capable of improving stability of a connection part of a substrate connected with a shunt resistor. The current detection device (1) is provided with: a substrate (3) having a current detection unit; a connection terminal (5) having a first connection portion (51) connected to the substrate, an intermediate portion (53) protruding from the first connection portion so as to be orthogonal to the substrate, a second connection portion (52) connected to the shunt resistor (4), and a bent portion (54) connecting the second connection portion and the intermediate portion; a resin holding member (6) which is integrally molded with the intermediate portion, holds the intermediate portion, and is supported by the substrate; a fixed terminal (7) having a base portion held by the holding member and a protruding portion (72), the protruding portion being soldered to the substrate; a housing (2) having an opening (22) through which the second connection portion is exposed; and a shunt resistor disposed outside the case so as to face the opening, and fastened to the second connection portion by a screw member.

Description

Current detection device
Technical Field
The present invention relates to a current detection device.
Background
Conventionally, there is a technology for detecting a current using a shunt resistor. Patent document 1 discloses a battery control device provided with: a current detection circuit electrically connected to a shunt resistor provided with a plurality of connection pins, for detecting a battery current flowing through the shunt resistor; a substrate on which a current detection circuit is mounted; and a connector mounted to the substrate.
Prior art literature
Patent literature
Patent document 1: japanese patent laid-open No. 2020-201059
Disclosure of Invention
Technical problem to be solved by the invention
In the structure in which the shunt resistor is electrically connected to the substrate, it is preferable that the stability of the connection portion in the substrate can be improved.
The invention aims to provide a current detection device capable of improving stability of a connection part connected with a shunt resistor in a substrate.
Means for solving the problems
The current detection device of the present invention is characterized by comprising: a substrate having a current detection portion; a connection terminal having: a first connection part electrically connected with the substrate; an intermediate portion protruding from the first connection portion so as to be orthogonal to the substrate; a second connection portion electrically connected to the shunt resistor; and a bending portion connecting the second connecting portion with the intermediate portion; a resin-made holding member that is integrally molded with the intermediate portion and holds the intermediate portion, the holding member being supported by the substrate; a fixed terminal having: a base portion held by the holding member; and a protruding portion protruding from the holding member, the fixing terminal fixing the holding member to the substrate by welding the protruding portion to the substrate; a housing that accommodates the substrate, the connection terminal, the fixed terminal, and the holding member, and has an opening that exposes the second connection portion; and a shunt resistor disposed outside the case so as to face the opening, and fastened to the second connection portion by a screw member.
Effects of the invention
In the current detecting device according to the present invention, the holding member is integrally formed with the intermediate portion of the connection terminal, and therefore the mechanical strength is improved. In addition, since the connection terminal has the bent portion between the intermediate portion and the second connection portion, an external force acting on the second connection portion is not easily transmitted to the first connection portion. Further, the holding member is firmly fixed to the substrate through the fixing terminal. According to the current detection device of the present invention, the stability of the connection portion connected to the shunt resistor in the substrate can be improved.
Drawings
Fig. 1 is a perspective view of a current detection device according to an embodiment.
Fig. 2 is an exploded perspective view of the current detection device according to the embodiment.
Fig. 3 is a perspective view of a holding member and a terminal according to an embodiment.
Fig. 4 is a perspective view of a connection terminal according to an embodiment.
Fig. 5 is a perspective view of a fixed terminal according to an embodiment.
Fig. 6 is a diagram illustrating an assembly process of the current detection device according to the embodiment.
Fig. 7 is a cross-sectional view of the current detection device according to the embodiment.
Symbol description
1: current detection device
2: a shell, 3: substrate, 3a: first face, 3b: a second surface
4: shunt resistance, 5: connection terminal, 5A: first connection terminal, 5B: second connecting terminal
6: holding member, 6a: first end, 6b: second end portion
7: fixed terminal, 8: screw member, 9: cover, 10: nut, 11: screw part
21: insert port, 22: an opening
41: first through holes, 42: second through hole, 43: third through hole
51: first connecting portion, 52: second connection portion, 53: intermediate portion, 53a: inclined surface
54: bending portion, 55: main body, 56: internal thread part
61: first leg, 62: second leg, 63: third leg portion
71: base, 71a: inclined surface, 72: protruding part
X: first direction, Y: second direction, Z: third direction of
Detailed Description
Hereinafter, a current detection device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to this embodiment. The constituent elements of the following embodiments include elements that can be easily recognized by those skilled in the art or substantially the same elements.
Embodiment(s)
An embodiment will be described with reference to fig. 1 to 7. The present embodiment relates to a current detection device. Fig. 1 is a perspective view of a current detecting device according to an embodiment, fig. 2 is an exploded perspective view of the current detecting device according to an embodiment, fig. 3 is a perspective view of a holding member and a terminal according to an embodiment, fig. 4 is a perspective view of a connection terminal according to an embodiment, fig. 5 is a perspective view of a fixed terminal according to an embodiment, fig. 6 is a view explaining an assembling process of the current detecting device according to an embodiment, and fig. 7 is a cross-sectional view of the current detecting device according to an embodiment.
As shown in fig. 1 to 3, the current detection device 1 of the present embodiment includes a housing 2, a substrate 3, a shunt resistor 4, a connection terminal 5, a holding member 6, a fixing terminal 7, and a screw member 8. The current detection device 1 is disposed in, for example, a battery of a vehicle, and detects a charge/discharge current of the battery. The current detection device 1 is a so-called shunt current sensor. That is, the current detection device 1 causes a current to flow through the shunt resistor 4, and calculates a current value using ohm's law from a voltage drop at the time of energization and a resistance value of the shunt resistor 4.
The shunt resistor 4 is exemplified as a rectangular flat plate shape. Bus bars are connected to both ends of the shunt resistor 4. One bus bar is connected to, for example, the negative electrode of the battery. The other bus bar is connected to, for example, a ground of a vehicle body or the like. Based on the current value detected by the current detection device 1, the battery is monitored and controlled.
As shown in fig. 2 and the like, the current detection device 1 of the present embodiment has a pair of connection terminals 5 for connecting the shunt resistor 4 to the substrate 3. The current detection unit 31 of the substrate 3 is connected to the shunt resistor 4 via the connection terminal 5. The current detection unit 31 is, for example, a current detection circuit. The current detection device 1 of the present embodiment has a holding member 6 that holds the connection terminal 5. As described below, the holding member 6 can improve the accuracy of current detection and stability of the connection portion between the connection terminal 5 and the substrate 3.
The housing 2 accommodates the substrate 3, the connection terminals 5, the holding member 6, and the fixed terminals 7. The case 2 is molded from, for example, an insulating synthetic resin. The illustrated housing 2 has a square cylindrical shape. The housing 2 has an insertion opening 21 at one end. The board 3, the connection terminals 5, the holding member 6, and the fixed terminals 7 are inserted into the housing 2 from the insertion port 21. A guide portion 23 for guiding the board 3 and a locking portion for locking the board 3 are provided inside the housing 2.
In the following description, the insertion direction of the substrate 3 into the housing 2 is referred to as "first direction X". The first direction X is the axial direction of the cylindrical housing 2. The width direction of the case 2 and the substrate 3 is referred to as "second direction Y", and the height direction of the case 2 is referred to as "third direction Z". The third direction Z is the thickness direction of the substrate 3. The first direction X, the second direction Y and the third direction Z are mutually orthogonal.
A recess 24 for accommodating the shunt resistor 4 is provided on the back side in the first direction X of the case 2. The recess 24 is formed on the outer side surface of the housing 2. The shape of the recess 24 in plan view is a rectangle corresponding to the shape of the shunt resistor 4. Two openings 22 are provided in the recess 24. The two openings 22 are aligned along the second direction Y. The opening 22 is rectangular in shape, for example. The substrate 3 is inserted into the housing 2 up to a position where the second connection portion 52 of the connection terminal 5 opposes the opening 22. The case 2 engages the substrate 3 with the second connection portion 52 exposed from the opening 22.
The housing 2 holds two nuts 10. The nut 10 is pressed into the housing 2 in a first direction X. The shunt resistor 4 has a pair of first through holes 41, a pair of second through holes 42, and a pair of third through holes 43. The through holes 41, 42, 43 are aligned along the second direction Y. The first through-hole 41 is disposed at the innermost side, and the third through-hole 43 is disposed at the outermost side.
The first through hole 41 corresponds to the screw member 8. The screw member 8 is inserted through the first through hole 41 and screwed into the second connection portion 52 of the connection terminal 5. The second through hole 42 corresponds to the screw member 11. The screw member 11 is a fastening member for fixing the shunt resistor 4 to the case 2. The screw member 11 is inserted through the second through hole 42 and screwed into the screw hole of the housing 2. The housing 2 may hold a nut corresponding to the screw member 11.
The third through hole 43 corresponds to the nut 10. The bus bars are fixed to the shunt resistor 4 by screw members and nuts 10, not shown. Each bus bar may have a through hole corresponding to the third through hole 43. In this case, the screw member is inserted into the through hole of the bus bar and the third through hole 43, and is screwed with the nut 10.
A connector 32 is disposed on the substrate 3. The current detection unit 31 may be connected to an external monitoring device via a connector 32. The cover 9 engages with the housing 2 to close the insertion opening 21 of the housing 2. The cover 9 has a through hole corresponding to the connector 32.
As shown in fig. 3, the holding member 6 holds two connection terminals 5 and one fixed terminal 7. The holding member 6 is molded from an insulating synthetic resin. The holding member 6 is integrated with the two connection terminals 5 and the fixed terminal 7 by insert molding. The fixed terminal 7 is insulated from the connection terminal 5. The holding member 6 has a substantially rectangular parallelepiped shape.
The connection terminal 5, the holding member 6, and the fixed terminal 7 will be described with reference to each direction X, Y, Z in a state where the holding member 6 is fixed to the substrate 3 and accommodated in the case 2. The two connection terminals 5 include a first connection terminal 5A and a second connection terminal 5B. The two connection terminals 5 are arranged at the first end 6a of the holding member 6. The fixed terminal 7 is disposed at the second end 6b of the holding member 6. The first end portion 6a and the second end portion 6b are end portions of the holding member 6 in the first direction X. That is, the fixed terminals 7 are arranged at positions apart from the two connection terminals 5 in the first direction X. The fixed terminal 7 is disposed between the two female screw portions 56 in the second direction Y. That is, the fixed terminal 7 is arranged between the two female screw portions 56 in a plan view of the substrate 3.
The two connection terminals 5 are arranged along the second direction Y. The first connection terminal 5A is disposed at one end in the second direction Y, and the second connection terminal 5B is disposed at the other end in the second direction Y. The fixed terminal 7 is disposed at the center in the second direction Y. That is, the position of the fixed terminal 7 in the second direction Y is a position between the first connection terminal 5A and the second connection terminal 5B, for example, a position of the center.
As shown in fig. 4, the connection terminal 5 has a first connection portion 51, a second connection portion 52, an intermediate portion 53, and a bent portion 54. The connection terminal 5 is formed of a conductive metal such as copper. The connection terminal 5 is formed of, for example, a single metal plate. The first connection portion 51 is physically and electrically connected to the substrate 3. The first connection portion 51 is exemplified as a flat plate shape or a prismatic shape. The first connection portion 51 is inserted into the through hole of the substrate 3 and soldered to the substrate 3. The first connection portion 51 is connected to the current detection portion 31 via the circuit pattern of the substrate 3.
The second connection portion 52 is fastened to the shunt resistor 4 by the screw member 8. The illustrated second connecting portion 52 has a flat plate-like main body 55 and a cylindrical female screw portion 56. The main body 55 is rectangular in shape in plan view. The female screw portion 56 protrudes from the central portion of the main body 55 toward the first connecting portion 51 side. The inner peripheral surface of the female screw portion 56 is formed with female screw by tapping. An inclined surface 56a for guiding is provided at the inlet of the female screw portion 56.
The intermediate portion 53 is enclosed in the resin of the holding member 6 and held by the holding member 6. The intermediate portion 53 is a portion between the first connection portion 51 and the second connection portion 52. The intermediate portion 53 is continuous with the first connecting portion 51 and is located on an extension line of the first connecting portion 51. The illustrated intermediate portion 53 is in the shape of a flat plate. The intermediate portion 53 has a tapered shape that gradually narrows in width as it goes toward the first connecting portion 51 along the third direction Z. The side surface of the intermediate portion 53 has a plurality of inclined surfaces 53a. The inclined surface 53a is inclined so as to approach the center line of the intermediate portion 53 as the first connecting portion 51 approaches along the third direction Z. A stepped portion 53b is provided at an end of the intermediate portion 53. The step portion 53b is disposed at an end portion of the side surface of the intermediate portion 53 on the second connection portion 52 side.
The bent portion 54 connects the intermediate portion 53 and the second connecting portion 52. The illustrated bending portion 54 is bent so that the second connection portion 52 is orthogonal to the first connection portion 51. The first connecting portion 51 and the intermediate portion 53 extend in the third direction Z, and the second connecting portion 52 extends in the first direction X. The curved portion 54 has an arcuate curved shape when viewed from the side. The width Wd2 of the bent portion 54 is narrower than the width Wd1 of the intermediate portion 53 and narrower than the width Wd3 of the second connecting portion 52. That is, the bending portion 54 has a smaller rigidity than the intermediate portion 53 and the second connecting portion 52, and is easily elastically deformed.
As shown in fig. 5, the fixed terminal 7 has a base 71 and a protruding portion 72. The fixed terminal 7 is formed of a metal plate. The fixed terminal 7 may have conductivity. The base 71 is sealed in the resin of the holding member 6 and held by the holding member 6. The protruding portion 72 is a portion protruding from the holding member 6 along the third direction Z.
The base 71 has a flat plate shape, extending along the third direction Z. The base 71 has a tapered shape that gradually narrows in width as it goes toward the protruding portion 72 along the third direction Z. The side surface of the base 71 has a plurality of inclined surfaces 71a. The inclined surface 71a is inclined so as to approach the center line of the base 71 as the protruding portion 72 approaches along the third direction Z. A stepped portion 71b is provided at an end of the base portion 71. The step portion 71b is disposed at an end portion of the base portion 71 on the opposite side from the protruding portion 72 side.
The shape of the illustrated protrusion 72 is a flat plate shape or a prismatic shape. The protruding portion 72 is inserted into the through hole of the substrate 3 and soldered to the substrate 3. The fixing terminal 7 fixes the holding member 6 to the substrate 3 by soldering the protruding portion 72 to the substrate 3.
As shown in fig. 3, the first connection portion 51 of the connection terminal 5 and the protruding portion 72 of the fixed terminal 7 protrude from the holding member 6 in the third direction Z. The first connecting portion 51 and the protruding portion 72 protrude toward the first side Z1. The first side Z1 is the substrate 3 side when viewed from the holding member 6. That is, the first connecting portion 51 and the protruding portion 72 protrude from the holding member 6 toward the substrate 3 side.
The second connection portion 52 and the bent portion 54 of the connection terminal 5 protrude from the holding member 6 in the third direction Z. The second connecting portion 52 and the bent portion 54 protrude toward the second side Z2. The second side Z2 is the shunt resistor 4 side when viewed from the holding member 6. That is, the second connecting portion 52 and the bent portion 54 protrude from the holding member 6 toward the shunt resistor 4. The main body 55 and the female screw portion 56 of the second connecting portion 52 face the holding member 6 in the third direction Z. The female screw portion 56 protrudes from the main body 55 toward the holding member 6 in the third direction Z.
The holding member 6 has three leg portions 61, 62, 63 protruding toward the first side Z1. Three legs 61, 62, 63 are supported by the base plate 3. The first leg 61 is disposed on the first end 6a side, and the second leg 62 and the third leg 63 are disposed on the second end 6b side.
The first leg 61 is located between the two first connection portions 51. The first leg 61 protrudes from the first end 6a toward the first side Z1. The first leg 61 is rectangular in shape as viewed from the first direction X. The front end surface of the first leg 61 is placed on the substrate 3 and supported by the substrate 3.
The second leg 62 and the third leg 63 are disposed at the corners of the holding member 6. The second leg portion 62 and the third leg portion 63 are arranged so as to sandwich the protruding portion 72 of the fixed terminal 7. In other words, the second leg 62 is disposed on one side of the second direction Y with respect to the protruding portion 72, and the third leg 63 is disposed on the other side of the second direction Y with respect to the protruding portion 72. When the holding member 6 is viewed from the first side Z1, the second leg 62 and the third leg 63 are formed in a substantially L-shape and are bent at right angles. The second leg portion 62 and the third leg portion 63 have a portion extending in the first direction X and a portion extending in the second direction Y, respectively. The distal end surfaces of the second leg portion 62 and the third leg portion 63 are placed on the substrate 3 and supported by the substrate 3.
The holding member 6 has protrusions 64, 65 protruding toward the first side Z1. A protrusion 64 protrudes from the second leg 62 and a protrusion 65 protrudes from the third leg 63. The illustrated projections 64, 65 are cylindrical in shape. The substrate 3 has positioning portions corresponding to the projections 64, 65. The positioning portion is a recess or hole portion formed in the substrate 3. The holding member 6 is positioned with respect to the substrate 3 by inserting the projections 64, 65 into the positioning portions.
As shown in fig. 2, the holding member 6 is placed on the first surface 3a of the substrate 3. The substrate 3 has through holes corresponding to the connection terminals 5 and the fixed terminals 7. The first connection portion 51 of the connection terminal 5 and the protruding portion 72 of the fixed terminal 7 are inserted into the corresponding through hole. The first connecting portion 51 and the protruding portion 72 are fixed to the second surface 3b of the substrate 3 by welding. The first connection portion 51 is connected to the circuit pattern of the substrate 3. The protruding portion 72 is connected to a fixing pad or the like.
Fig. 6 shows the housing 2 in which the connection terminal 5 and the like are housed in predetermined positions. The second connection portion 52 of the connection terminal 5 is exposed at the opening 22 of the housing 2. The shunt resistor 4 is placed in the recess 24 of the case 2 so as to face the opening 22, and is fixed to the case 2 by the screw member 11. The second connection portion 52 of each connection terminal 5 is fastened to the shunt resistor 4 by the screw member 8. The screw member 8 is inserted through the first through hole 41 of the shunt resistor 4 and screwed into the female screw portion 56 of the connection terminal 5.
Fig. 7 shows an X-Z section comprising a threaded part 8 and a connection terminal 5. The section of fig. 7 is a section along the central axis of the threaded member 8. As shown in fig. 7, the first through hole 41 of the shunt resistor 4 faces the female screw portion 56 in the third direction Z. The screw member 8 is screwed into the female screw portion 56, and the main body 55 of the connection terminal 5 is brought into contact with the shunt resistor 4. The screw member 8 has conductivity and can electrically connect the shunt resistor 4 to the second connection portion 52.
The first connection portion 51 of the connection terminal 5 is connected to the substrate 3 by the solder 12 and is fixed to the substrate 3. The intermediate portion 53 protrudes from the first connection portion 51 toward the shunt resistor 4 so as to be orthogonal to the substrate 3. The protruding portion 72 of the fixed terminal 7 is fixed to the substrate 3 by the solder 12. The holding member 6 is mounted on the substrate 3 and fixed to the substrate 3 by solder 12.
Here, when the screw member 8 is screwed into the female screw portion 56, an external force acts on the second connecting portion 52. The connection terminal 5 and the holding member 6 according to the present embodiment can suppress the transmission of the external force to the first connection portion 51. When an external force acts on the second connection portion 52, the bent portion 54 of the connection terminal 5 can be elastically deformed to absorb the external force. When the screw member 8 is inserted into the female screw portion 56 in an inclined posture, the bent portion 54 is elastically deformed, so that the female screw portion 56 can follow the screw member 8.
The holding member 6 is integrally formed with the intermediate portion 53 of the connection terminal 5, and holds the intermediate portion 53. Therefore, the holding member 6 can suppress transmission of the external force acting on the second connection portion 52 to the first connection portion 51. For example, the holding member 6 is supported by the base plate 3, and can support the intermediate portion 53 against the force in the third direction Z.
The holding member 6 is fixed to the substrate 3 via a fixing terminal 7. Therefore, the force received by the holding member 6 is dispersed to the connection portion between the fixed terminal 7 and the substrate 3. The fixed terminals 7 are arranged apart from the intermediate portion 53 of the connection terminal 5 in the first direction X. Therefore, the fixing terminal 7 can stabilize the force and moment of the holding member 6 with respect to the first direction X.
The current detection device 1 of the present embodiment can reduce the influence of external force on the connection portion between the connection terminal 5 and the substrate 3, and can improve the stability of the connection portion. Therefore, the current detection device 1 of the present embodiment can transmit an electric signal from the shunt resistor 4 to the substrate 3 without impairing the accuracy, and can ensure the accuracy of current measurement. In addition, in the current detection device 1 of the present embodiment, the shunt resistor 4 is integrated with the upper surface of the case 2, whereby the reduction of the exclusive area of the device can be achieved.
As described above, the current detection device 1 of the present embodiment includes: a substrate 3 having a current detecting portion 31, a connection terminal 5, a resin holding member 6, a fixing terminal 7, a case 2, and a shunt resistor 4. The connection terminal 5 has a first connection portion 51, an intermediate portion 53, a second connection portion 52, and a bent portion 54. The first connection portion 51 is electrically connected to the substrate 3. The intermediate portion 53 protrudes from the first connection portion 51 so as to be orthogonal to the substrate 3. The second connection portion 52 is electrically connected to the shunt resistor 4. The bent portion 54 connects the second connecting portion 52 with the intermediate portion 53.
The holding member 6 is integrally formed with the intermediate portion 53, holds the intermediate portion 53, and is supported by the substrate 3. The fixed terminal 7 has a base 71 held by the holding member 6 and a protruding portion 72 protruding from the holding member 6. The fixing terminal 7 fixes the holding member 6 to the substrate 3 by soldering the protruding portion 72 to the substrate 3. The housing 2 accommodates the substrate 3, the connection terminals 5, the fixed terminals 7, and the holding member 6. The housing 2 has an opening 22 exposing the second connection portion 52. The shunt resistor 4 is disposed outside the case 2 so as to face the opening 22. The shunt resistor 4 is fastened to the second connecting portion 52 by the screw member 8.
In the current detecting device 1 of the present embodiment, the holding member 6 is integrally formed with the intermediate portion 53 of the connection terminal 5, and therefore the mechanical strength is improved. In addition, since the connection terminal 5 has the bent portion 54 between the intermediate portion 53 and the second connection portion 52, an external force acting on the second connection portion 52 is not easily transmitted to the first connection portion 51. Further, the holding member 6 is firmly fixed to the substrate 3 by the fixing terminals 7. Therefore, the current detection device 1 of the present embodiment can improve the stability of the connection portion of the substrate 3 to the shunt resistor 4. For example, the stability of the soldered portion of the first connection portion 51 and the substrate 3 improves.
The second connection portion 52 of the present embodiment includes: a flat plate-shaped body 55 in contact with the shunt resistor 4; and a cylindrical female screw portion 56 protruding from the main body 55 toward the substrate 3 side. The shunt resistor 4 has a first through hole 41, and the first through hole 41 is opposed to the female screw portion 56. The screw member 8 is inserted into the first through hole 41 and screwed into the female screw portion 56 to fasten the second connecting portion 52 to the shunt resistor 4. In such a structure, an external force generated when the screw member 8 is screwed with the female screw portion 56 is absorbed by the bent portion 54.
The holding member 6 of the present embodiment holds the intermediate portions 53 of the two connection terminals 5. The two female screw portions 56 face the holding member 6. In the planar view of the substrate 3, the fixed terminal 7 is disposed between the two female screw portions 56. Therefore, the fixing terminal 7 can appropriately support the holding member 6 to cope with the external force when the screw member 8 is screwed with each female screw portion 56.
The shape of the curved portion 54 is not limited to the illustrated shape. For example, the bending portion of the bending portion 54 is not limited to one. The bending portion 54 may be bent at 2 or more points.
The shape of the holding member 6 is not limited to the illustrated shape. The holding member 6 may hold a plurality of fixed terminals 7. In this case, the plurality of fixed terminals 7 are soldered to the substrate 3, respectively.
The disclosure of the above embodiments can be performed in appropriate combination.

Claims (3)

1. A current detection device is characterized by comprising:
a substrate having a current detection portion;
a connection terminal having: a first connection part electrically connected with the substrate; an intermediate portion protruding from the first connection portion so as to be orthogonal to the substrate; a second connection portion electrically connected to the shunt resistor; and a bending portion connecting the second connecting portion with the intermediate portion;
a resin-made holding member that is integrally molded with the intermediate portion and holds the intermediate portion, the holding member being supported by the substrate;
a fixed terminal having: a base portion held by the holding member; and a protruding portion protruding from the holding member, the fixing terminal fixing the holding member to the substrate by welding the protruding portion to the substrate;
a housing that accommodates the substrate, the connection terminal, the fixed terminal, and the holding member, and has an opening exposing the second connection portion; and
the shunt resistor is disposed outside the case so as to face the opening, and is fastened to the second connection portion by a screw member.
2. The current detecting apparatus according to claim 1, wherein,
the second connection part has: a flat plate-shaped body in contact with the shunt resistor; and a cylindrical female screw portion protruding from the main body toward the substrate side,
the shunt resistor has a through hole, and the through hole is arranged opposite to the internal thread part,
the screw member is inserted into the through hole and screwed with the female screw portion to fasten the second connection portion and the shunt resistor.
3. The current detecting apparatus according to claim 2, wherein,
the holding member holds the intermediate portions of the two connection terminals,
two of the female screw portions are opposed to the holding member,
the fixed terminal is disposed between the two female screw portions when the substrate is viewed in plan.
CN202310519923.7A 2022-05-11 2023-05-10 Current detection device Pending CN117054718A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022078029A JP7485721B2 (en) 2022-05-11 2022-05-11 Current Detector
JP2022-078029 2022-05-11

Publications (1)

Publication Number Publication Date
CN117054718A true CN117054718A (en) 2023-11-14

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Application Number Title Priority Date Filing Date
CN202310519923.7A Pending CN117054718A (en) 2022-05-11 2023-05-10 Current detection device

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JP (1) JP7485721B2 (en)
KR (1) KR20230158416A (en)
CN (1) CN117054718A (en)
DE (1) DE102023111432A1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4032750B2 (en) 2001-01-15 2008-01-16 松下電工株式会社 Shunt resistor and adjustment method
DE102004053648A1 (en) 2004-11-03 2006-05-04 Leopold Kostal Gmbh & Co. Kg Battery current sensor for a motor vehicle
JP5224383B2 (en) 2009-03-31 2013-07-03 古河電気工業株式会社 Battery state detection sensor device
JP5619663B2 (en) 2011-03-31 2014-11-05 古河電気工業株式会社 Shunt resistor connection terminal and battery state detection device
JP2018189384A (en) 2017-04-28 2018-11-29 株式会社Ｇｓユアサ Current detection device, management device, and battery for starting engine
JP7033990B2 (en) 2018-04-09 2022-03-11 株式会社デンソーテン Electronic equipment and shunt resistance fixed structure
JP7287837B2 (en) 2019-06-06 2023-06-06 日立Astemo株式会社 Battery controller, battery pack
JP2021085732A (en) 2019-11-27 2021-06-03 株式会社豊田自動織機 Current measuring device

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JP7485721B2 (en) 2024-05-16
KR20230158416A (en) 2023-11-20
DE102023111432A1 (en) 2023-11-16

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