JP7112984B2 - Battery status detection device - Google Patents

Description

The present invention relates to a battery state detection device.

A battery state detection device that detects the state of a battery mounted in a vehicle such as an automobile is known. The battery status sensing device includes components for sensing current, such as shunt resistors and circuit boards. 2. Description of the Related Art A known battery state detection device includes a case that houses a circuit board and the like (see Patent Document 1, for example).

Generally, a battery mounted on a vehicle is provided with a battery post projecting from the upper surface thereof, and a battery post terminal is fixed to the battery post. Harnesses for power supply are connected to the battery post terminals. The battery state detection device is connected between the battery post terminals and the harnesses. In this case, the battery condition sensing device is fixed to the battery post terminal.

WO2014/203465

By the way, in the conventional battery state detection device, an operator may hold the case of the battery state detection device when removing the battery post terminal at the time of battery replacement.

However, in the conventional battery state detection device, in the above case, a load may be applied to the portion of the case that is in contact with the battery post terminal.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a battery state detection device capable of improving the durability of the case.

A battery state detection device according to a representative embodiment of the present invention accommodates a circuit board having a battery post terminal and a current detection circuit electrically connected to the battery post terminal to detect current. and a harness connecting portion provided in the case to which a harness can be connected, wherein the battery post terminal is an electrode fitting for fixing the battery post terminal to the battery post. an extension portion extending from the electrode fitting portion; a joint portion bent from the extension portion and joined to the bottom portion of the case so as to cover the bottom portion of the case; and a reinforcing portion that reinforces the joint portion, and an insertion portion that extends along the case from the joint portion. It has a fitting part that fits with the part.

According to the battery state detection device of the present invention, the durability of the case can be improved.

1 is a perspective view of a battery state detection device according to an embodiment; FIG. 1 is a perspective view of a battery state detection device according to an embodiment; FIG. 1 is a perspective view of a battery state detection device according to an embodiment; FIG. 1 is a perspective view of a battery state detection device according to an embodiment; FIG. 1 is a front view of a battery state detection device according to an embodiment; FIG. 1 is a sectional view taken along line AA of a battery state detection device according to an embodiment; FIG. 1 is a perspective view of a case of a battery state detection device according to an embodiment; FIG. 1 is a perspective view of a case of a battery state detection device according to an embodiment; FIG. It is a bottom view of the case of the battery state detection device according to the embodiment. 3 is a perspective view of a battery post terminal of the battery state detection device according to the embodiment; FIG. 3 is a perspective view of a battery post terminal of the battery state detection device according to the embodiment; FIG. 1 is an exploded perspective view of a battery state detection device according to an embodiment; FIG. 1 is an exploded perspective view of a battery state detection device according to an embodiment; FIG.

A battery state detection device 1 according to an embodiment of the present invention will be described below with reference to the drawings.

Hereinafter, for convenience of explanation, the direction parallel to the axial direction of a battery post (not shown) with which the battery post terminal 10 engages with the battery post terminal 10 in the battery state detection device 1 shown in FIG. do. The axial direction is also referred to as the vertical direction. The lateral direction of the extension portion 16, which is one of the directions orthogonal to the axis of the battery state detection device 1 (the x-axis direction), is defined as the left-right direction. The x-axis direction is also the horizontal direction in the battery state detection device 1 . The other (y-axis direction) of the directions orthogonal to the axis of the battery state detection device 1 is defined as the front-rear direction. In the battery state detection device 1, the −y direction is also called the front side, and the +y direction is also called the back side. Furthermore, in the battery state detection device 1, the direction viewed from the -y direction to the +y direction is the front direction. In the following description, when describing the positional relationship and direction of each component as the right side, left side, front side, rear side, upper side, and lower side, only the positional relationship and direction in the drawings are shown, and the actual battery state detection device The positional relationship and direction are not limited.

[Schematic configuration of battery state detection device]
1 to 4 are perspective views of a battery state detection device 1 according to an embodiment. 5 is a front view of the battery state detection device 1. FIG. 6 is a cross-sectional view of the battery state detection device 1 taken along the line AA.

As shown in FIGS. 1 to 6, the battery state detection device 1 includes a circuit board including a battery post terminal 10 and a current detection circuit electrically connected to the battery post terminal 10 to detect current. A case 70 for housing and a harness connection part 80 provided in the case 70 to which a harness can be connected are provided. The battery post terminal 10 is provided with an electrode fitting portion 21 for fixing the battery post terminal 10 to the battery post, an extension portion 16 extending from the electrode fitting portion 21, and bent from the extension portion 16, A joint portion 11 that is joined to the bottom portion 72 so as to cover the bottom portion 72 of the case 70, reinforcement portions 112 and 163 that reinforce the extension portion 16 and the joint portion 11, and along the side portion 73 of the case 70 from the joint portion 11 and an insertion portion 12 provided to extend. The case 70 has a fitting portion 74 that fits with the insertion portion 12 by accommodating the insertion portion 12 . The battery state detection device 1 will be specifically described below.

[Case configuration]
A specific configuration of the case 70 will be described.

7 and 8 are perspective views of the case 70 of the battery state detection device 1. FIG. FIG. 9 is a bottom view of the case 70 of the battery state detection device 1. FIG. The case 70 includes a top portion 71 , a bottom portion 72 , a side portion 73 , a fitting portion 74 , a locking portion 75 , a connector portion 76 and first ribs 78 . The case 70 has a space (a substrate housing portion 77 : see FIG. 6) inside surrounded by a top portion 71 , a bottom portion 72 and a side portion 73 . The case 70 has an opening on the side of the bottom portion 72, and the board accommodating portion 77 and the outside communicate with each other. In the case 70, the substrate accommodating portion 77 is closed from the outside by fixing the bottom portion 72 to the opening portion on the bottom portion 72 side. The case 70 is formed, for example, in the shape of a substantially rectangular parallelepiped box. The case 70 is made of resin, for example.

As shown in FIG. 5, the case 70 accommodates a circuit board 90 having a current detection circuit configured to detect current by electrically connecting to the battery post terminal 10 in the board accommodation portion 77 . A circuit board 90 includes a shunt resistor 91 in which a resistor (for example, manganin) having a known resistance value is arranged. The shunt resistor 91 is electrically connected to the circuit board 90, and part of it is exposed to the outside of the case 70 from the back side 73 of the case 70 as shown in FIGS. . The shunt resistor 91 is electrically connected to the battery post terminal 10 via the shunt resistor connection portion 13 included in the battery post terminal 10 .

As shown in FIGS. 7 to 9, the upper surface portion 71 forms the upper surface of the case 70 which is formed in a box shape. A connector portion 76 is formed on the upper surface portion 71 . Further, the upper surface portion 71 is provided with a harness connection portion 80 to which a harness (not shown) can be connected. The connector portion 76 may be molded integrally with the upper surface portion 71 or may be molded separately.

The bottom portion 72 is provided on the bottom surface of the box-shaped case 70 , in other words, below the top surface portion 71 so as to face the top surface portion 71 . The bottom portion 72 is formed in a rectangular or substantially rectangular shape when viewed from below. The bottom portion 72 closes an opening (not shown) provided on the lower side of the case 70 . The bottom portion 72 has, for example, a bottom portion main body 721 formed in a flat or substantially flat shape, and claw portions 722 provided on the side surface of the bottom portion main body 721 on the short side. The claw portions 722 fix the bottom portion 72 to the opening of the case 70 by being inserted into insertion holes (not shown) provided in the side portion 73 on the short side.

The side portion 73 forms a side surface of the box-shaped case 70 . The side surface portion 73 is connected to the upper surface portion 71 so as to surround the outer periphery of the upper surface portion 71 . A fitting portion 74 into which the insertion portion 12 of the battery post terminal 10 can be inserted is provided, for example, on the front side of the side portion 73 . The terminal of the shunt resistor 91 is exposed to the outside from the back side of the side portion 73 . In addition, the side surface portion 73 has, for example, an insertion hole (not shown) for inserting the above-described claw portion 722 on the short side.

The fitting portion 74 is provided on the side portion 73 of the case 70, specifically, on the side portion 73 on the front side. The fitting portion 74 includes an opening portion 741 , a housing portion 742 , an inner wall portion 743 , a second rib 744 and a locking portion 75 .

The opening 741 opens toward the lower side of the case 70 . The inserting portion 12 of the battery post terminal 10 is inserted into the accommodating portion 742 as shown in FIGS. 1 to 5 . For this reason, the accommodation portion 742 is formed in a concave groove shape having a predetermined depth so that the insertion portion 12 can be accommodated therein. The accommodating portion 742 is provided with an inner wall portion 743 for enclosing and accommodating the insertion portion 12 . The inner wall portion 743 is provided with a plurality of second ribs 744 extending in the horizontal direction (x-axis direction) for accommodation at predetermined intervals. The second ribs 744 are formed on both inner wall portions 743 facing each other inside the accommodating portion 742 . The second rib 744 is provided for press-fitting the plate-shaped insertion portion 12 inserted into the housing portion 742 from the thickness direction (y-axis direction). Therefore, in the accommodating portion 742 , the distance in the y-axis direction between the facing second ribs 744 is the same as or slightly smaller than the plate thickness of the insertion portion 12 .

It should be noted that the second ribs 744 are not limited to those provided apart in the z-axis direction on the inner wall portions 743 facing each other as shown in FIG. That is, the second ribs 744 may also be provided so as to face each other in the inner wall portions 743 that face each other.

The locking portion 75 locks the battery post terminal 10 and the case 70 by being locked to the fixing hole 14 of the insertion portion 12 inserted into the housing portion 742 . The locking portion 75 is provided at a position facing the fixing hole 14 of the insertion portion 12 in a state accommodated inside the accommodation portion 742 . Specifically, the locking portion 75 has a claw-like shape extending toward the inside of the case 70 , that is, toward the inside of the accommodating portion 742 so that it can be locked to the fixing hole 14 provided in the insertion portion 12 . formed.

The first rib 78 extends inside the upper surface portion 71 from the board accommodating portion 77 to the fitting portion 74 . The first rib 78 is provided to reinforce the upper surface portion 71 of the case 70 .

The harness connection portion 80 is provided for connecting a harness for electrical equipment (not shown). The shape and position of the harness connection portion 80 are not particularly limited in the battery state detection device 1 .

[Configuration of battery post terminal]
Next, a specific configuration of the battery post terminal 10 will be described.

10 and 11 are perspective views of the battery post terminal 10 of the battery state detection device 1. FIG. The battery post terminal 10 is configured by fastening and assembling a plate-like member 40 vertically using bolts 50 and nuts 60 as fastening members. The battery post terminal 10 is made of a conductive metal material. The battery post terminal 10 includes an electrode fitting portion 21 provided on the right side in FIG. It includes a joint 11 whose longitudinal direction is the vertical direction (z-axis direction), an insertion section 12 positioned on the front side of the joint 11 , and a shunt resistance connection section 13 positioned on the back side of the joint 11 . Moreover, the battery post terminal 10 includes a fixing portion 31 located on the right side of the electrode fitting portion 21 . The battery post terminal 10 includes a joint portion 11, an insertion portion 12, a shunt resistor connection portion 13, a fixing hole 14, an extension portion 16, an electrode fitting portion 21, and a fixing portion 31, which are integrally formed.

Here, the battery post terminal 10 is formed such that the extension portion 16 and the joint portion 11 are formed along the planar portion of the battery housing (not shown) in which the battery post is provided. Specifically, the extension portion 16 is formed along the electrode fitting portion 21 along with the surface of the battery housing on which the battery post is provided, for example, along the upper surface of the battery housing. Also, the joint portion 11 is formed along a surface of the battery housing that is connected to the surface on which the battery post is provided via a bent portion, for example, along the side surface of the battery housing.

The joint portion 11 is provided by bending downward (z-axis direction) from the extension portion 16 at a bending portion 163 . The joint portion 11 is joined to the bottom portion 72 of the case 70 of the battery state detection device 1 so as to cover the bottom portion 72 . The joint portion 11 is formed in a shape corresponding to the shape of the bottom portion 72, such as a rectangular shape or a substantially rectangular shape. More specifically, the joint portion 11 has a shape corresponding to the shape of the bottom surface of the case 70 so as to cover the bottom portion 72 and the outer periphery of the bottom surface of the case 70 . With such a shape, the joint portion 11 is joined to the entire bottom surface of the case 70 . The shape of the joint portion 11 can be formed in any shape according to the shape of the bottom portion 72 of the case 70 . The joint portion 11 also functions as a structural member that supports the case 70 . In the joint portion 11, a rib-shaped reinforcing portion 112 is formed by bending along the longitudinal direction of a flat joint portion main body 111 extending along the z-axis direction. The joint portion 11 is provided with an upright wall portion 19 extending from the end on the far side.

The insertion portion 12 is a vertical wall-shaped member that is bent from the front end of the joint portion 11 and extends in the direction of the upper surface portion 71 along the side surface portion 73 of the case 70 that is arranged above the joint portion 11 . is. The insertion portion 12 is configured integrally with the joint portion 11, for example. The insertion portion 12 has a notch portion 15 at its end. The notch portion 15 is provided at a position of the fitting portion 74 of the case 70 facing the first rib 78 (see FIG. 8) provided inside the housing portion 742 .

The shunt resistor connection portion 13 extends from the end portion of the standing wall portion 19 by being bent toward the back side. The shunt resistor connection portion 13 has a flat surface in the horizontal direction and the vertical direction, and this surface extends from a side surface portion 73 on the back side of the case 70 in FIGS. It is electrically connected to the shunt resistor 91 that is present. The shunt resistor connecting portion 13 is provided, for example, at a position facing the side surface portion 73 on the back side of the case 70 . In the battery state detection device 1, the shunt resistor connecting portion 13 and the shunt resistor 91 are electrically connected to electrically connect the battery and the harness (not shown).

The fixing hole 14 is a hole provided in the insertion portion 12 . The fixing hole 14 is provided at a position facing the locking portion 75 when the insertion portion 12 is inserted into the fitting portion 74 . The fixing hole 14 locks the locking portion 75 to fix the locking portion 75 . In the battery state detection device 1 , the case 70 is fixed to the battery post terminal 10 by engaging the fixing hole 14 of the battery post terminal 10 with the locking portion 75 of the case 70 .

The electrode fitting portion 21 fixes the battery post terminal 10 to a battery post (not shown). The electrode fitting portion 21 is formed in a substantially frustum shape having a space inside to match the shape of the substantially frustum-shaped battery post. The electrode fitting portion 21 has a circular fitting hole formed in the center thereof, which vertically penetrates the space. The inner peripheral surface of the electrode fitting portion 21 is inclined so as to be in surface contact with the inclined outer peripheral surface of the battery post. In addition, a plurality of grooves are provided at intervals in the circumferential direction on the inner peripheral surface of the electrode fitting portion 21 to increase the tightening force for sandwiching the outer peripheral surface of the battery post. The electrode fitting portion 21 is attached so as to cover the inner peripheral surface of the battery post from above.

Further, the electrode fitting portion 21 is formed integrally and continuously with the extension portion 16 at the left portion, but has a shape branched (divided) in the front and rear direction with the inner peripheral surface interposed therebetween at the right portion. there is The fixing portion 31 is formed so as to extend rightward from each of the tip portions of the electrode fitting portion 21 branched forward and backward.

The fixing portion 31 extends rightward from the electrode fitting portion 21 and is formed so as to accommodate the screw portion of the bolt 50 therein. A plate member 40 is attached to the fixed portion 31 .

The plate-like member 40 is formed in a substantially rectangular shape and has an insertion hole in its central portion. A screw portion of a bolt 50, which will be described later, is inserted through the insertion hole. The plate-like member 40 is in surface contact with the fixing portion 31 in a state where it is attached to the fixing portion 31 .

The bolt 50, as shown in FIG. 1, is composed of a threaded portion extending in the front-rear direction and a head positioned on the far side of the threaded portion. The screw portion has a screw thread formed in a predetermined length range from the front end portion.

The extension portion 16 is provided so as to extend leftward in the horizontal direction (x-axis direction) from the electrode fitting portion 21 . The extension portion 16 includes a flat portion 161 , a reinforcing portion 162 and a bent portion 163 . The planar portion 161 is a substantially flat plate-like member along the horizontal direction formed integrally with the electrode fitting portion 21 . The reinforcing portion 162 is formed by bending the flat plate portion 161 into a rib shape along the longitudinal direction (x-axis direction). The bent portion 163 is formed by bending the left end portion of the flat plate portion 161 opposite to the right end portion in contact with the electrode fitting portion 21 downward (−z axis direction). ing.

The extension portion 16 is provided with a reinforcing member 17 formed by bending a metal plate member on the upper surface of the flat plate portion 161 . Further, the extension portion 16 is provided with an upright wall portion 18 extending from the insertion portion 12 . Further, the extended portion 16 is provided with an upright wall portion 19 extending from the joint portion 11 .

[Function of battery state detection device]
Next, operation of the battery state detection device 1 according to the embodiment will be described.

FIG. 12 is an exploded perspective view of the battery state detection device 1. FIG. FIG. 13 is an exploded perspective view of the battery state detection device 1. FIG.

As shown in FIGS. 12 and 13, in the battery state detection device 1, when the case 70 is attached to the battery post terminal 10, the insertion portion 12 is housed inside the housing portion 742, so that the case 70 is attached to the battery. It is fixed to the post terminal 10 . At this time, the bottom portion 72 of the case 70 is joined to the joint portion 11 of the battery post terminal 10 .

More specifically, the insertion portion 12 is housed inside the housing portion 742 through the opening portion 741 . When the insertion portion 12 is accommodated inside the accommodation portion 742 , the locking portion 75 provided in the fitting portion 74 is locked in the fixing hole 14 provided in the insertion portion 12 . Inside the housing portion 742 , the position of the notch portion 15 provided at the tip portion corresponds to the position of the first rib 78 provided inside the case 70 . Therefore, the insertion portion 12 is reliably accommodated inside the accommodation portion 742 .

By providing the structure described above, the battery state detection device 1 is joined so that the joint portion 11 provided on the metal battery post terminal 10 covers the bottom portion 72 which is the lower surface portion of the case 70 . By being configured in this manner, the battery state detection device 1 is configured such that when an operator holds the case 70 and removes the battery state detection device 1 from the battery, the force required to remove the battery state detection device 1 is can be received by a joint 11 made of Specifically, according to the battery state detection device 1 described above, the load when removing from the battery is distributed to the joint portion between the joint portion 11 and the bottom portion 72, specifically, to the outer peripheral portion of the bottom portion 72 of the case 70. be able to. Therefore, according to the battery state detection device 1 described above, since it is difficult to add to the case 70 made of resin, the durability of the case 70 can be improved.

In the battery state detection device 1 , the insertion portion 12 of the battery post terminal 10 is accommodated inside the accommodation portion 742 of the fitting portion 74 of the case 70 . Therefore, according to the battery state detection device 1 , the load at the time of removal from the battery can be distributed to locations other than the junction between the junction 11 and the bottom portion 72 .

In addition, in the battery state detection device 1 , the fixing hole 14 provided in the insertion portion 12 of the battery post terminal 10 is engaged with the locking portion 75 provided in the case 70 . Therefore, according to the battery state detection device 1, even if a load is applied to the case 70 when it is removed from the battery, it is possible to prevent the case 70 from falling off from the battery post terminal 10 and being damaged. can.

Although the battery state detection device 1 according to the embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment, and various modifications and changes can be made based on the technical idea of the present invention. It is possible.

The joint portion 11 of the battery post terminal 10 is not limited to the rectangular or substantially rectangular shape described above, and is joined to the outer peripheral portion of the bottom portion 72 of the case 70 so that the force applied from the case 70 to the joint portion 11 can be dispersed. It is sufficient if it has a shape corresponding to the shape of the bottom portion 72 . Further, the joint portion 11 does not need to be a plate-like shape with no irregularities as a whole, and may be provided with holes or irregularities in part thereof, for example. The insertion portion 12 is not limited to the shape described above as long as it can be inserted into the fitting portion 74 of the case 70 .

The fitting portion 74 of the case 70 is not limited to the shape described above, and may have a shape corresponding to the shape of the insertion portion 12 so that the fitting portion 74 can be fitted with the insertion portion 12 . Moreover, the positions and shapes of the fixing hole 14 and the notch 15 are not limited to the shapes described above.

The fitting portion 74 of the case 70 may have a second rib 744 on the inner wall portion 743 at a position facing the insertion portion 12 when the insertion portion 12 is accommodated in the fitting portion 74 . The second rib 744 is a crush rib, and the distance in the y-axis direction between the facing inner wall portions 743 is the same as or slightly smaller than the plate thickness of the insertion portion 12 . Therefore, when the insertion portion 12 is accommodated in the accommodation portion 742 of the fitting portion 74, the insertion portion 12 is pressed into the second rib 744 as a crush rib, and the insertion portion 12 is scraped or crushed. You can hold it stronger. The second rib 744 is preferably triangular in cross section, semicircular, or the like, but is not limited thereto.

The configuration of the electrode fitting portion 21, the fixing portion 31, the plate member 40, the bolt 50, and the nut 60 of the battery post terminal 10 may be different from the configuration described above.

Further, the configuration of the connector portion 76 of the case 70 may be different from the configuration described above.

1 battery state detection device 10 battery post terminal 11 joint 12 insertion portion 13 shunt resistor connection portion 14 fixing hole 15 notch 21 electrode fitting portion 31 fixing portion 40 plate member 50 bolt 60 nut 70 case 71 upper surface portion 72 bottom portion 73 Side portion 74 Fitting portion 75 Locking portion 76 Connector portion 77 Board accommodating portion 78 First rib 80 Harness connecting portion 90 Circuit board 91 Shunt resistor 721 Bottom main body 722 Claw portion 741 Opening 742 Accommodating portion

Claims (9)

battery post terminals and
a case housing a circuit board including a current detection circuit configured to detect current by being electrically connected to the battery post terminal;
a harness connection portion provided in the case to which a harness can be connected;
A battery state detection device comprising:
The battery post terminals are
an electrode fitting portion that fixes the battery post terminal to the battery post;
an extension extending from the electrode fitting portion;
a joint portion bent from the extension portion and joined to the bottom portion of the case so as to cover the bottom portion;
a reinforcement portion that reinforces the extension portion and the joint portion;
an insertion portion provided to extend from the joint portion along the case;
Said case is
Having a fitting portion that fits with the insertion portion by accommodating the insertion portion,
Battery status detection device. The reinforcement portion is formed by bending along the longitudinal direction of the extension portion and the joint portion,
The battery state detection device according to claim 1. The extension is provided with a reinforcing member,
The battery state detection device according to claim 1 or 2. The fitting portion has a locking portion that fixes the inserted insertion portion,
The battery state detection device according to any one of claims 1 to 3. The locking portion is formed in a claw shape extending toward the inside of the case,
The insertion portion is provided at a position facing the locking portion in a state accommodated in the fitting portion, and has a fixing hole for locking and fixing the locking portion,
The battery state detection device according to claim 4. The case comprises a shunt resistor electrically connected to the circuit board,
a portion of the shunt resistor is exposed outward from a side surface of the case opposite to the fitting portion;
The battery post terminal has a shunt resistor connection portion provided on the opposite side of the joint portion from the insertion portion and electrically connected to a portion of the shunt resistor exposed from the case,
The battery state detection device according to any one of claims 1 to 5. The case has a first rib extending inside to the fitting portion,
The insertion portion has a notch at a position facing the first rib at the end,
The battery state detection device according to any one of claims 1 to 6. The extension portion and the joint portion are formed along a housing of the battery provided with the battery post,
The battery state detection device according to any one of claims 1 to 7. The case has a second rib at the fitting portion,
The second rib is provided at a position facing the insertion portion when the insertion portion is accommodated in the fitting portion.
The battery state detection device according to any one of claims 1 to 8.

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