JP2015185396A - battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent instantaneous interruption of power supply for electrical equipment even in a case where an impact by falling and the like is added to a bimetal type current breaking element 305.SOLUTION: A battery comprises: a built-in substantially-rectangular parallelepiped battery cell; a bimetal type current breaking element for detecting heat of the battery cell; and an outer case for housing the battery cell. The bimetal type current breaking element is arranged on a first surface on of the battery cell. Inside the outer case, a first spacer abutting on the first surface of the cell is provided. A height of the first spacer is at least higher than a mounting height of the bimetal current breaking element.

Description

  The present invention relates to a battery using a bimetal type current interrupting element.

  Some conventional batteries use a bimetallic current interrupting element in order to detect abnormal heat generation in a battery cell (see Patent Document 1). As shown in FIG. 6, the internal configuration of the battery includes a battery cell 303, a circuit board 308, a battery terminal 309 mounted on the circuit board 308, conductive members 306 and 307, a holding member 304, in exterior cases 301 and 302. A bimetallic current interrupting element 305 is accommodated. As shown in FIG. 7, a bimetallic current blocking element 305 is disposed on the upper surface of the battery cell 303, and is in contact with the battery cell 303 so that the temperature of the battery cell 303 is transmitted.

  Further, as shown in FIG. 8, in the circuit diagram of the battery, the battery cell 303 and the bimetallic current interrupting element 305 are connected in series, and are connected to the circuit board 308 by connection portions 311 and 312. When the battery cell 303 becomes high temperature, the contact of the element 305 is released and the circuit is cut off.

JP 7-134983 A

  However, the battery has a gap in consideration of cell expansion in the event of abnormal heat generation, and a gap for improving part processing error and assemblability. In the above conventional example, as shown in FIG. 9, when the battery receives an impact due to dropping or the like, the internal battery cell 303 moves through the gap, and the bimetallic current blocking element 305 disposed on the upper surface of the battery cell 303 is provided. The case may collide with the outer case 301. Due to the impact of the collision at that time, there is a problem that the contact portion 310 inside the bimetallic current interrupting element 305 is separated and the power supply of the electronic device may be momentarily interrupted.

  An object of the present invention is to prevent an instantaneous interruption of the power supply of an electric device even when an impact due to dropping or the like is applied to the bimetallic current interruption element 305.

The configuration of the battery according to the present invention is as follows.
A built-in substantially rectangular parallelepiped battery cell, a bimetallic current interruption element for detecting heat of the battery cell, and an outer case for housing the battery cell,
The bimetallic current interrupting element is disposed on the first surface of the battery cell;
A spacer that abuts the first surface of the cell on the inner side of the outer case,
The height of the spacer is at least higher than the mounting height of the bimetallic current interrupting element.

  According to the present invention, when an impact due to dropping or the like is applied, the spacer disposed inside the outer case abuts against the cell and the outer case and receives the impact, whereby the bimetal current interrupting device is directly impacted. It is possible to prevent the circuit from being interrupted.

It is a perspective view at the time of removing the exterior case from the battery according to the first embodiment of the present invention. It is a perspective view of the exterior case in connection with the 1st Embodiment of this invention. It is sectional drawing of the battery in connection with the 1st Embodiment of this invention. 1 is a perspective view of a battery according to a first embodiment of the present invention and an electronic device in which the battery is mounted. It is sectional drawing of the battery and battery box which concern on the 1st Embodiment of this invention. It is a disassembled perspective view of the conventional battery. It is a perspective view at the time of removing the exterior case from the conventional battery. It is a circuit diagram of the conventional battery. It is sectional drawing of the conventional battery. (A) represents a normal state, and (b) represents a state in which a bimetallic current interruption element is in contact with the outer case.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

<First Embodiment>
A first embodiment will be described with reference to FIGS. As shown in FIG. 1, the battery cell 109, the battery terminal 109 mounted on the circuit board 108, the conducting member 106, the holding member 104, and the bimetal type current interrupting element 105 are housed in the outer cases 101 and 102. ing. The circuit board 108 on which the battery terminal 109 is mounted and the battery cell 103 are held by a holding member 104. The circuit board 108, the bimetallic current interruption element 105, and the battery cell 103 are connected by a conductive member 106, and the bimetallic current interruption element 105 is disposed on the upper surface 103 (a) of the battery cell. The battery terminal 109 is connected to a power supply terminal (not shown) of an electronic device in which the battery is mounted, and supplies power from the battery cell 103. As shown in FIGS. 2 and 3, ribs 101 (a) are formed on the inner surface of the outer case 101 opposite to the upper surface 103 (a) of the battery cell on which the bimetallic current blocking element 105 is disposed. ing. At this time, the height A of the rib 101 (a) is higher than the mounting height B of the bimetallic current interrupting element 105.

  By implementing the first embodiment, when the battery receives an impact due to dropping in the Z direction, the internal battery cell 103 moves in the Z direction, and the bimetal disposed on the upper surface 103 (a) of the battery cell. The rib 101 (a) inside the outer case collides with the upper surface 103 (a) of the battery cell before the current-type current interrupting device 105 collides with the outer case 101. It is possible to prevent the circuit from being interrupted without applying an impact. Further, when the battery receives an impact caused by dropping in the X and Y directions, the bimetal type current interrupting element 105 is not subjected to an impact in the direction in which the contacts are separated, and the contacts are not separated.

  The rib 101 (a) inside the outer case in the first embodiment may be replaced with a spacer such as an elastic member. When the elastic member is crushed by the movement of the battery cell 103, the elastic member is configured so as not to be crushed at least more than the mounting height B of the bimetallic current interrupting element 105.

  An embodiment of a battery box 201 in which the battery of the first embodiment is mounted will be described with reference to FIGS. As shown in FIG. 4, a battery is attached to a battery box 201 that is a battery attachment location in the electronic device 200. At that time, power is supplied through the battery terminal 109 as described above. As shown in FIG. 5, when the battery is attached to the battery box 201, the rib 201 (a) is formed in the battery box so as to receive the vicinity of the place where the rib 101 (a) inside the outer case is formed.

  By implementing the form of the battery box, the outer case portion facing the bimetallic current interrupting element 105 is strongly pressed and the outer case is bent, so that the inner side of the outer case contacts the bimetallic current interrupting element 105, An impact can be prevented. The rib 201 (a) in the battery box may be replaced with a spacer such as an elastic member.

  Although the present invention has been described in detail based on preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the present invention are also included in the present invention. included. A part of the above-described embodiments may be appropriately combined.

101, 102, 301, 302 ... outer case 103, 303 ... battery cell 104, 304 ... holding member 105, 305 ... bimetal type current blocking element 106, 306, 307 ... conduction member 109, 309 ... battery Terminals 111, 112, 311 and 312 ... Circuit board connection part 200 ... Electronic equipment 201 ... Battery box 308 of electronic equipment ... Circuit board 310 ... Contact part of bimetallic current interrupting element

Claims (7)

A built-in rectangular parallelepiped battery cell, a bimetallic current interrupting element that detects heat of the battery cell, and an outer case that houses the battery cell;
The bimetallic current interrupting element is disposed on the first surface of the battery cell;
A first spacer abutting against the first surface of the cell on the inner side of the outer case;
The battery according to claim 1, wherein a height of the first spacer is higher than at least a mounting height of the bimetallic current interrupting element. 2. The battery according to claim 1, wherein two or more first spacers are formed so as to sandwich the bimetallic current interrupting element. 3. The battery according to claim 1, wherein the first spacer is a rib formed integrally with the exterior case. The battery according to claim 1, wherein the first spacer is a sponge elastic member. In an electronic device including a battery box for mounting the battery, a second spacer is provided inside the battery box, and the second spacer is formed on the exterior case in the vicinity of the portion where the first spacer is formed. The battery box for mounting the battery according to any one of claims 1 to 4, wherein the battery box is disposed so as to be in contact with the outside. The battery box according to claim 5, wherein the second spacer is a sponge elastic member. The battery box according to claim 5, wherein the second spacer is a rib formed integrally with the battery box.