JP2018037209A - Seal structure of housing for battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal structure of a housing for a battery pack capable of suppressing forgetting to mount a seal member therein.SOLUTION: A seal structure 1 of a housing for a battery pack includes: a housing 2 having a first opening 11; a terminal block 3 having a base 21 which is arranged in the housing 2 corresponding to the first opening 11 and a connection terminal 22 which is erected in the base 21 and protrudes from the first opening 11; a cover part 4 which is arranged in the outside of the housing 2 and has a second opening 31 inserting the connection terminal 22 therethrough; and a seal member 5 which is arranged between an opening edge 31a of the second opening 31 in the cover member 4 and the base 21 of the terminal block 3. The inner diameter R2 of the seal member 5 has a smaller diameter than an opening diameter S2 of the second opening 31.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sealing structure for a battery pack housing.

  As a conventional battery pack, for example, there is a secondary battery device described in Patent Document 1. This conventional secondary battery device is configured by housing a battery stack assembly in which battery modules in which battery cells are arranged in a plurality of stages are stacked in a box-shaped housing.

JP 2011-54353 A

  For example, a power harness for supplying power from the battery pack to an external device or a communication harness used for information communication with various devices may be connected to the battery pack as described above. In connecting the harness, for example, a configuration in which the terminal portion of the harness is fixed to the terminal block exposed from the opening provided in the wall portion of the housing may be employed.

  On the other hand, when providing an opening in the wall of the housing, it is necessary to seal the opening of the housing after connecting the harness to the terminal block. In this case, a configuration in which the opening of the housing is sealed by fixing the cover member to the housing via the sealing member is conceivable. However, in order to prevent forgetting to attach the sealing member when fixing the cover member. It is preferable that a device for assembly is made.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a battery pack casing sealing structure that can suppress forgetting to attach a seal member.

  A battery pack casing sealing structure according to one aspect of the present invention includes a casing having a first opening, a base disposed in the casing corresponding to the first opening, and a base. A terminal block having a connection terminal provided and projecting from the first opening; a cover member having a second opening that is disposed outside the housing and through which the connection terminal is inserted; and a second opening in the cover member A sealing member disposed between the opening edge of the portion and the base of the terminal block, and the inner diameter of the sealing member is smaller than the opening diameter of the second opening.

  In this battery pack housing sealing structure, the inner diameter of the seal member disposed at the base of the terminal block is smaller than the diameter of the second opening provided in the cover member. Thereby, when attaching a cover member to the outer side of a housing | casing, the inner peripheral part of a sealing member is exposed from a 2nd opening part, and it becomes possible to confirm easily the presence or absence of a sealing member by visual recognition. Therefore, forgetting to attach the seal member can be suppressed.

  The battery pack casing sealing structure according to one aspect of the present invention includes a casing having a first opening, a base disposed in the casing corresponding to the first opening, and a base A terminal block having a connection terminal that stands upright and protrudes from the first opening, a cover member that is disposed outside the housing and has a second opening through which the connection terminal is inserted, and a second in the cover member A sealing member disposed between the opening edge of the opening and the base of the terminal block, and the inner periphery of the sealing member is exposed in the second opening when viewed from the outside of the housing Yes.

  In this battery pack housing sealing structure, the inner peripheral portion of the seal member is exposed in the second opening as viewed from the outside of the cover member. Thereby, when attaching a cover member to the outer side of a housing | casing, it becomes possible to confirm easily the presence or absence of a sealing member by visual recognition. Therefore, forgetting to attach the seal member can be suppressed.

  Moreover, the opening edge part of the 2nd opening part may press the sealing member between the base parts with the fastening member with a flange screwed together by the outer peripheral surface of the connecting terminal. In the configuration in which the inner peripheral portion of the seal member is exposed from the second opening, the opening diameter of the second opening is relatively large as compared with the configuration in which the inner peripheral portion of the seal member is not exposed. For this reason, by using a fastening member with a flange, the cover member can be fastened to the base portion of the terminal block with a sufficient fastening force, and the sealing member can be firmly pressed by the opening edge of the cover member.

  According to the present invention, forgetting to attach the seal member can be suppressed.

It is sectional drawing which shows one Embodiment of the sealing structure of the housing | casing for battery packs. It is sectional drawing which shows the mode of attachment of the cover member with respect to a housing | casing. FIG. 3 is a plan view of FIG. 2.

  Hereinafter, preferred embodiments of a sealing structure for a battery pack housing according to one aspect of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view showing an embodiment of a sealing structure for a battery pack housing. The battery pack housing sealing structure 1 is a sealing structure applied to a battery pack housing mounted as a battery of various vehicles such as forklifts, hybrid vehicles, and electric vehicles. As shown in FIG. 1, the sealing structure 1 for the battery pack casing is composed of a casing 2, a terminal block 3, a cover member 4, and a seal member 5.

  The housing | casing 2 is comprised by the substantially rectangular parallelepiped box shape with the metal, for example. For example, a plurality of battery modules, junction boxes, and the like are accommodated in the housing 2. The battery module is fixed to the inner wall of the housing 2 via a bracket, for example. The battery module is a power storage module such as a lithium ion secondary battery, for example, and includes an array formed by arranging a plurality of battery cells, a restraining member that applies a restraining load in the array direction of the array, and the like. Yes. Each battery module in the housing 2 is connected to a junction box by a harness.

  In the junction box, for example, a control ECU (Electronic Control Unit) for controlling a relay, a cable, and a battery pack is accommodated. The junction box is fixed to the inner wall of the housing 2 via a bracket, for example.

  The wall 2a of the housing 2 is provided with a first opening 11 having a circular cross section, for example. The wall part 2a is a wall part which comprises the top part of the housing | casing 2, for example. The first opening 11 serves as a connection port between the battery module accommodated in the housing 2 and the harness V extending from the vehicle side on which the battery pack is mounted. Inside the housing 2, for example, a bus bar 12 extending from a junction box is disposed, and a front end portion 12 a of the bus bar 12 extends to a position directly below the first opening 11. A through hole 14 for fixing the terminal block 3 is provided at the distal end portion 12 a of the bus bar 12.

  The terminal block 3 is a member used for connecting the harness V. The terminal block 3 includes, for example, a base portion 21 and a connection terminal 22 erected on the base portion 21. The base 21 is formed in a cylindrical shape by a conductive member such as copper, and is disposed in the housing 2 corresponding to the first opening 11. A male screw portion 23 is provided on the base end surface 21 a of the base portion 21. The terminal block 3 is configured such that the male screw portion 23 is screwed into the through hole 14 of the bus bar 12 and the nut 24 is fastened to the front end of the male screw portion 23 protruding from the through hole 14, thereby Is fixed.

  Similar to the base portion 21, the connection terminal 22 is formed in a hollow cylindrical shape having a smaller diameter than the base portion 21 by a conductive member such as copper. On the inner peripheral surface 22a of the connection terminal 22, a female screw portion 26 used for fastening the fixing bolt K is provided. Further, the outer peripheral surface 22b of the connection terminal 22 is provided with a male screw portion 27 used for fastening a flanged nut (a flanged fastening member) 32 described later.

  The harness V connected to the connection terminal 22 is a power harness for supplying power from a battery pack to an external device, for example. A round terminal Va is provided at the tip of the harness V. The harness V is fixed to the connection terminal 22 by screwing the shaft portion Ka of the fixing bolt K through the round terminal Va into the female screw portion 26 of the inner peripheral surface 22a of the connection terminal 22.

  The cover member 4 is a member attached to the outside of the housing 2 so as to surround the connection terminal 22 and the vicinity thereof. The cover member 4 is formed in a plate shape with a resin such as polypropylene, for example. The wall 4a of the cover member 4 is provided with a second opening 31 having a smaller diameter than the first opening 11 on the housing 2 side. The wall part 4a is a wall part which comprises the bottom part of the cover member 4, for example. The cover member 4 is disposed outside the housing 2 so that the first opening 11 and the second opening 31 are concentric, and the connection terminal 22 includes the first opening 11 and the second opening. The part 31 is inserted and protrudes outside the housing 2.

  The seal member 5 is a member that seals between the cover member 4 and the terminal block 3. The seal member 5 is formed in an annular shape by resin, for example. The seal member 5 is passed through the connection terminal 22 and is disposed on the distal end surface 21 b side of the base portion 21 in the terminal block 3 so as to be concentric with the first opening portion 11 and the second opening portion 31.

  The outer diameter R <b> 1 of the seal member 5 is smaller than the opening diameter S <b> 1 of the first opening 11 and larger than the opening diameter S <b> 2 of the second opening 31. Further, the inner diameter R <b> 2 of the seal member 5 is smaller than the opening diameter S <b> 2 of the second opening 31. Therefore, when viewed from the outside of the cover member 4, the inner peripheral portion 5 a of the seal member 5 is exposed in the second opening 31.

  In the present embodiment, a flanged nut 32 is used to compress the seal member 5. The flanged nut 32 is screwed into a male screw portion 27 provided on the outer peripheral surface 22 b of the connection terminal 22. As a result, the seal member 5 is pressed between the opening edge 31a of the second opening 31 and the distal end surface 21b of the base 21 and compressed in the thickness direction, and the space between the cover member 4 and the terminal block 3 is reduced. It is hermetically sealed. In addition, since the inner peripheral part 5a of the seal member 5 exposed in the second opening 31 is not pressed by the opening edge 31a, it does not contribute to the sealing between the cover member 4 and the terminal block 3. However, when the outer peripheral portion 5b of the seal member 5 is compressed between the opening edge portion 31a and the distal end surface 21b of the base portion 21, the sealing performance of the seal member 5 is sufficiently exhibited.

  In forming the battery pack casing sealing structure 1 as described above, first, the sealing member 5 is attached to the base 21 of the terminal block 3 fixed to the bus bar 12 in the casing 2. Next, the cover member 4 is aligned so that the first opening 11 and the second opening 31 are concentric, and the connection terminal 22 protrudes from the first opening 11 and the second opening 31. Thus, the cover member 4 is disposed outside the housing 2.

  In this state, as described above, the inner diameter R2 of the seal member 5 disposed on the base 21 of the terminal block 3 is smaller than the opening diameter S2 of the second opening 31 provided in the cover member 4. Yes. For this reason, as shown in FIGS. 2 and 3, when the cover member 4 is attached to the outside of the housing 2, the inner peripheral portion 5 a of the seal member 5 exposed in the second opening 31 is covered with the cover member 4. It becomes possible to visually recognize from the outside. Therefore, forgetting to attach the seal member 5 can be suppressed based on whether or not the inner peripheral portion 5 a of the cover member 4 can be visually recognized from the second opening 31.

  After confirming that the inner peripheral portion 5 a of the seal member 5 is visible from the second opening 31, the flanged nut 32 is screwed into the male screw portion 27 of the outer peripheral surface 22 b of the connection terminal 22. Thereby, the sealing member 5 is pressed between the opening edge part 31a of the second opening part 31 and the base part 21, and the space between the cover member 4 and the terminal block 3 is hermetically sealed. Thereafter, the fixing bolt K is screwed into the female thread portion 26 of the inner peripheral surface 22a of the connection terminal 22, and the harness V is connected to the connection terminal 22, so that the battery pack housing sealing structure shown in FIG. 1 is formed.

  In this embodiment, the opening edge 31 a of the second opening 31 presses the seal member 5 between the base 21 of the terminal block 3 by the flanged nut 32 screwed to the outer peripheral surface 22 b of the connection terminal 22. doing. As described above, in the configuration in which the inner peripheral portion 5a of the seal member 5 is exposed from the second opening 31, the opening of the second opening 31 is compared with the configuration in which the inner peripheral portion 5a of the seal member 5 is not exposed. The diameter S2 tends to be relatively large. In contrast, by using the flanged nut 32 as the pressing member of the seal member 5, the cover member 4 can be fastened to the base 21 of the terminal block 3 with a sufficient fastening force, and the opening edge 31 a of the cover member 4 can be used. The seal member 5 can be pressed firmly.

  DESCRIPTION OF SYMBOLS 1 ... Battery pack housing sealing structure, 2 ... Housing, 3 ... Terminal block, 4 ... Cover member, 5 ... Seal member, 5a ... Inner peripheral part, 11 ... First opening part, 21 ... Base part, 22 ... Connection terminal, 22b ... Outer peripheral surface, 31 ... Second opening, 31a ... Opening edge, 32 ... Nut with flange (fastening member with flange), R2 ... Inner diameter of seal member, S2 ... Second opening Opening diameter.

Claims (3)

A housing having a first opening;
A terminal block having a base disposed in the housing corresponding to the first opening, and a connection terminal standing on the base and protruding from the first opening;
A cover member disposed outside the housing and having a second opening through which the connection terminal is inserted;
A seal member disposed between an opening edge of the second opening in the cover member and the base of the terminal block;
The sealing structure for a battery pack housing, wherein an inner diameter of the seal member is smaller than an opening diameter of the second opening. A housing having a first opening;
A terminal block having a base disposed in the housing corresponding to the first opening, and a connection terminal standing on the base and protruding from the first opening;
A cover member disposed outside the housing and having a second opening through which the connection terminal is inserted;
A seal member disposed between an opening edge of the second opening in the cover member and the base of the terminal block;
A sealing structure for a battery pack housing in which an inner peripheral portion of the seal member is exposed in the second opening as viewed from the outside of the cover member.   The said opening edge part of a said 2nd opening part is pressing the said sealing member between the said base parts with the fastening member with a flange screwed together by the outer peripheral surface of the said connection terminal. Sealing structure for the battery pack.

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