JP5339843B2 - Battery direct fuse unit - Google Patents

Description

  The present invention relates to a battery direct-attached fuse unit that enables electric wire connection via a fuse to a battery without going through a fuse box installed away from the battery.

  5 to 7 show a conventional example of a battery direct-attached fuse unit that enables electric connection to a battery via a fuse without going through a fuse box installed away from the battery. .

  The battery direct-attaching fuse unit 101 includes a first terminal plate portion 103 on one end side connected to a battery terminal (not shown) and a second terminal plate portion on the other end side connected to an output side electrical circuit. And a resin-made fuse housing 111 that accommodates the bus bar 109 in an L-shape across the ridge line portion of the battery.

  The bus bar 109 conductively connects the first and second terminal plate portions 103 and 105 between the first terminal plate portion 103 and the second terminal plate portion 105 so as to be fused by an overcurrent. A fusible link 107 is provided.

  The fusible body housing portion 112, which is a space for housing the fusible link 107 of the fuse housing 111, is covered with a transparent resin cover 113 so that the state of the fusible link 107 can be seen from the outside.

  In such a battery direct mounting fuse unit 101, the bus bar 109 and the fuse housing 111 are usually integrally formed by insert molding in which the bus bar 109 is placed in a resin mold and the fuse housing 111 is molded ( For example, see Patent Document 1).

JP 2005-339965 A

  By the way, if the fuse housing 111 breaks due to a shearing force when a part of the deformed vehicle body collides with the fuse unit 101 due to a collision accident of a vehicle in which the fuse unit 101 is mounted on the battery, the fuse housing 111 The bus bar 109 that has been accommodated is exposed.

  The bus bar 109 in the fuse housing 111 has a width dimension and the like of each part in consideration of the power supply capacity and heat dissipation. For this reason, there is a part set to a relatively small cross-sectional area.

  Therefore, for example, when the fuse housing 111 is broken in a region where the width W of the bus bar 109 is large and the bus bar 109 has a large cross-sectional area as shown by the line BB in FIG. 6, as shown in FIG. As a result, the exposed bus bar has a large area due to the fracture of the fuse housing 111. As a result, contact between the exposed bus bar and the vehicle body is likely to occur, and a short circuit may occur due to contact between the bus bar and the vehicle body.

  The object of the present invention is to solve the above-mentioned problems, and when the fuse housing of the battery direct-attached fuse unit breaks due to a vehicle collision or the like, the area of the bus bar exposed by the fuse housing breakage is restricted to a small amount. Another object of the present invention is to provide a battery direct-attached fuse unit capable of suppressing the occurrence of a short circuit between a bus bar exposed at a fracture portion of a fuse housing and a vehicle body.

The above-described object of the present invention is achieved by the following configuration.
(1) Fusing by overcurrent between the first terminal plate portion on one end side connected to the battery terminal and the second terminal plate portion on the other end side connected to the output-side electrical circuit. A battery direct bus comprising a metal bar bus bar provided with a fusible link for conducting connection between these terminal plate parts, and a resin fuse housing for housing the bus bar in an L shape straddling the ridge line part of the battery. Fuse unit,
When a shear load of a predetermined level or more is applied to the fuse unit due to an external force, the fusible link is quickly blown by energization heat generation when the cross-sectional area of the bus bar exposed to the cross section of the fuse unit exceeds the rated current. The fuse housing is provided with a notch for inducing breakage along the cross-unit position so that the fuse housing breaks at the cross-unit position where the minimum area required to reach the unit is reached . A battery direct mounting fuse unit.

  (2) The battery direct mounting fuse unit according to (1), wherein the bus bar is provided with a notch for inducing breakage along the unit crossing position.

(3) Fusing by overcurrent between the first terminal plate portion on one end side connected to the battery terminal and the second terminal plate portion on the other end side connected to the output-side electrical circuit. A battery direct bus comprising a metal bar bus bar provided with a fusible link for conducting connection between these terminal plate parts, and a resin fuse housing for housing the bus bar in an L shape straddling the ridge line part of the battery. Fuse unit,
When a shear load of a predetermined level or more is applied to the fuse unit by an external force, the fuse housing breaks at a unit crossing position where the cross-sectional area of the bus bar exposed on the cross section of the fuse unit is a small area of a predetermined level or less. In addition,
The fuse housing is provided with a notch for inducing breakage along the unit crossing position, and the bus bar is positioned closer to the base end side region side of the bus bar than the notch formed in the fuse housing. The battery direct-attached fuse unit is characterized by being provided with a notch for inducing breakage .

According to the configuration of (1), when a shear load of a predetermined level or more is applied to the fuse unit due to a collision with a vehicle body deformed due to a vehicle collision accident or the like, the fuse housing The minimum small area necessary for the fusible link to quickly reach the fusing temperature by energization heat generation when the bus bar breaks and the area of the bus bar exposed by the fracture of the fuse housing exceeds the assumed rated current Therefore, compared with the case where the bus bar is exposed in a large area, for example, the probability of contact with the surrounding vehicle body can be reduced and the occurrence of a short circuit can be suppressed.

  If the bus bar is not provided with a notch that induces breakage, the break position of the bus bar does not always coincide with the cross-unit position even if the fuse housing breaks at the cross-unit position equipped with the notch. There is a possibility that the breakage position may be shifted outward from the breakage position of the fuse housing, and the bus bar may protrude from the fracture surface of the fuse housing, resulting in a more adverse breakage.

  However, according to the configuration of (2), the bus bar can also be reliably broken at the crossing position of the unit equipped with the notch, and an unfavorable cutting situation occurs in which the bus bar protrudes outward from the fracture surface of the fuse housing. Can be prevented, and the short-circuit prevention effect can be enhanced.

  According to the configuration of (3), the fracture surface of the bus bar becomes a position recessed from the fracture surface of the fuse housing, and the short-circuit prevention effect can be further improved.

  According to the battery direct-attached fuse unit according to the present invention, when a shear load of a predetermined level or more is applied to the fuse unit due to a collision with a vehicle body deformed due to a vehicle collision accident or the like, the fuse is installed at a position crossing the unit provided with a notch. Since the area of the bus bar that is exposed when the housing is broken and the fuse housing is broken can be regulated to a small area that is less than or equal to a predetermined value, for example, compared with the case where the bus bar is exposed with a large area, The probability of contact can be reduced and the occurrence of a short circuit can be suppressed.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a preferred embodiment of a battery direct-attached fuse unit according to the present invention will be described in detail with reference to the drawings.

  1 is an enlarged view of a main part of an embodiment of a battery direct-attached fuse unit according to the present invention, FIG. 2 is a view taken along the arrow C in FIG. 1, FIG. 3 is a sectional view taken along the line DD in FIG. It is EE sectional drawing of FIG.

  The battery direct-attached fuse unit 1 according to this embodiment includes a first terminal plate 3 on one end side that is conductively connected to a battery terminal (not shown) and a second terminal on the other end side that is conductively connected to an output side electrical circuit. A metal plate bus bar 7 having two terminal plate portions 5 and a resin fuse housing 9 that accommodates the bus bar 7 in an L-shape across the ridge line portion of the battery.

  The bus bar 7 electrically connects the first and second terminal plate portions 3 and 5 between the first terminal plate portion 3 and the second terminal plate portion 5 so as to be fused by an overcurrent. A fusible link 11 is provided.

  Similarly to the fuse housing 111 shown in FIG. 5, the fuse housing 9 accommodates the bus bar 7 in an L shape across the ridge line portion of the battery in a side view.

  In addition, the fusible member accommodating portion 13 which is a space for accommodating the fusible link 11 of the fuse housing 9 is a transparent resin cover (not shown) so that the state of the fusible link 11 can be visually recognized from the outside. Covered.

  In the fuse unit 1 of the present embodiment, the bus bar 7 and the fuse housing 9 are integrally formed by insert molding in which the bus bar 7 is placed in a resin mold and the fuse housing 9 is molded.

  In the case of the present embodiment, the first terminal plate portion 3 of the bus bar 7 has a front end portion side region L1 connected to the fusible link 11 and a base end portion side region L2 connected to the battery terminal. The dimensions are different.

  A large width W2 is set in the base end side region L2 so that a large cross-sectional area advantageous for heat dissipation of energized heat generation can be secured. On the other hand, the distal end side region L1 is smaller than the proximal end side so as to have a minimum cross-sectional area necessary for causing the fusible link 11 to quickly reach the fusing temperature by energization heat generation when the rated current is exceeded. The width W1 is set.

  In the present embodiment, the overall shape of the first terminal plate portion 3 is not shown, but the width W1 of the tip end side region L1 is the minimum width dimension on the first terminal plate portion 3. ing.

  In the present embodiment, the position of the line segment DD that crosses the distal end portion side region L1 at a position close to the proximal end portion side region L2 is the cross sectional area of the bus bar 7 that is exposed to the transverse section of the fuse unit 1. The minimum unit crossing position P is set.

  The fuse housing 9 is broken along the unit transverse position P so that the fuse housing 9 breaks at the unit transverse position P when a predetermined or greater shearing load is applied to the fuse unit 1 by an external force. A notch 21 for inducing is provided.

  In the case of the present embodiment, the notch 21 for inducing breakage is a V-shaped groove as shown in FIG. 2 and extends over substantially the entire length of the unit crossing position P as shown by a thick solid line in FIG. ing.

Further, in the present embodiment, the bus bar 7 is also provided with a notch 23 that induces breakage along the unit crossing position P.
This notch 23 is also a V-shaped groove as shown in FIG.

  In the fuse unit 1 of the embodiment described above, the unit provided with the notch 21 when a shear load of a predetermined level or more is applied to the fuse unit 1 due to a collision with the vehicle body deformed due to a vehicle collision accident or the like. Since the fuse housing 9 is broken at the transverse position P (see FIG. 1), and the area of the bus bar 7 exposed by the breakage of the fuse housing 9 can be regulated to the minimum area assumed in advance as shown in FIG. Compared with the case where the fuse housing 9 is broken in the base end side region L2 where the bus bar 7 has a large width W2 and the bus bar having a large width W2 is exposed, the probability of contact with the surrounding vehicle body is reduced and Occurrence can be suppressed.

  Further, if the bus bar 7 is not provided with a notch 23 for inducing breakage, the break position of the bus bar 7 coincides with the unit crossing position P even if the fuse housing 9 breaks at the unit crossing position P equipped with the notch 21. For example, the break position of the bus bar 7 is shifted outward from the break position of the fuse housing 9, and the bus bar 7 protrudes from the fracture surface of the fuse housing 9. There is a risk.

  However, in the present embodiment, since the bus bar 7 is also provided with the notch 23 that induces breakage along the unit crossing position P, the bus bar 7 can also be reliably broken at the unit crossing position P. The occurrence of an unfavorable cutting situation in which the bus bar 7 protrudes outward from the broken surface 9 can be prevented, and the short-circuit prevention effect can be enhanced.

  Desirably, the notch 23 formed in the bus bar 7 should be slightly shifted from the notch 21 formed in the fuse housing 9 on the base end side region L2 side.

  If it does in this way, the torn surface of the bus-bar 7 will be in the position which became deep from the torn surface of the fuse housing 9, and it can improve the short circuit prevention effect further.

  The cross-sectional shape of the notches 21 and 23 formed in the bus bar and the fuse housing is not limited to the V shape shown in the above embodiment. A U-shaped or narrow rectangular groove may be used.

  Further, if there is no possibility that the break position of the bus bar is shifted from the break position of the fuse housing due to the strength of the bus bar, the notch for inducing breakage may be provided only in the fuse housing.

  Furthermore, in the above embodiment, the crossing position where the cross-sectional area of the bus bar exposed to the cross section of the fuse unit is minimized is selected as the unit crossing position P that induces breakage in the fuse housing 9. It is not necessary to select a crossing position that minimizes the area.

  For example, when there are many cross-sectional areas of the bus bar exposed in the cross-section of the fuse unit, it is desirable to select the cross-sectional position where the cross-sectional area of the bus bar exposed as much as possible is as the break induction position. However, if it is difficult to break the fuse housing at a position where the cross-sectional area of the exposed bus bar is minimum due to the structural conditions of the fuse housing, etc., the fuse housing can be easily broken and the bus bar The crossing position where the cross-sectional area becomes a small area may be selected as the unit crossing position P that induces breakage in the fuse housing 9.

  In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. In addition, the material, shape, dimension, numerical value, form, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

It is an enlarged view of the principal part of one Embodiment of the battery direct attachment fuse unit which concerns on this invention. It is C arrow line view of FIG. It is DD sectional drawing of FIG. It is EE sectional drawing of FIG. It is a perspective view of the conventional battery direct attachment fuse unit. FIG. 6 is an enlarged view showing the shape of the bus bar around the housing portion of the fusible link of the fuse unit, as viewed from the direction of arrow A in FIG. 5. It is BB sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuse unit 3 1st terminal board part 5 2nd terminal board part 7 Bus bar 9 Fuse housing 11 Fusible link 13 Soluble body accommodating part 21 Notch 23 Notch P Unit crossing position

Claims (3)

These terminals are fused by overcurrent between the first terminal plate portion on one end side that is conductively connected to the battery terminal and the second terminal plate portion on the other end side that is conductively connected to the output-side electrical circuit. A directly mounted battery fuse unit including a metal bar bus bar provided with a fusible link for conductively connecting between plate parts, and a resin fuse housing that houses the bus bar in an L shape across the ridge line part of the battery Because
When a shear load of a predetermined level or more is applied to the fuse unit due to an external force, the fusible link is quickly blown by energization heat generation when the cross-sectional area of the bus bar exposed to the cross section of the fuse unit exceeds the rated current. The fuse housing is provided with a notch for inducing breakage along the cross-unit position so that the fuse housing breaks at the cross-unit position where the minimum area required to reach the unit is reached. A battery direct mounting fuse unit.   The battery direct mounting fuse unit according to claim 1, wherein the bus bar is provided with a notch for inducing breakage along the crossing position of the unit. These terminals are fused by overcurrent between the first terminal plate portion on one end side that is conductively connected to the battery terminal and the second terminal plate portion on the other end side that is conductively connected to the output-side electrical circuit. A directly mounted battery fuse unit including a metal bar bus bar provided with a fusible link for conductively connecting between plate parts, and a resin fuse housing that houses the bus bar in an L shape across the ridge line part of the battery Because
When a shear load of a predetermined level or more is applied to the fuse unit by an external force, the fuse housing breaks at a unit crossing position where the cross-sectional area of the bus bar exposed on the cross section of the fuse unit is a small area of a predetermined level or less. In addition,
The fuse housing is provided with a notch for inducing breakage along the unit crossing position, and the bus bar is positioned closer to the base end side region side of the bus bar than the notch formed in the fuse housing. The battery direct-attached fuse unit is characterized by being provided with a notch for inducing breakage .

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