JPH10241646A - Packed cell - Google Patents

Abstract

PROBLEM TO BE SOLVED: To absorb vibration and shock applied to a packed cell and prevent leakage of an electrolyte by forming an electrolyte absorbent, arranged between electrode caps of a cell and an facing walls of a case, into a ring shape with space parts for inserting the protruding electrode caps through. SOLUTION: Electrolyte absorbents 6 are respectively arranged at both lengthwise ends of a lithium ion cell 2. The electrolyte absorbent 6 is formed in a three-ring connected shape so as to follow the outline of the cell 2, and an electrode cap 21 of the cell 2 exactly fits in each hollow part of the electrolyte absorbent 6. The electrolyte absorbent 6 is composed of a cushion, formed of a polymer material which absorbs vibrations, shocks and electrolytes, and a resin board formed of UL fiber. Vibration and shocks around the electrode cap 21 can therefore be absorbed, and even in the case that the electrolyte leaks from around the electrode cap 21, the electrolyte absorbent 6 absorbs it before flowing into the interior.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery pack.

[0002]

2. Description of the Related Art Battery packs have been widely used as power sources for portable information devices. Such a portable device can be used both indoors and outdoors, and can be used on the go or while traveling. In addition, since the battery pack can be easily attached to and detached from the device by the user, the user often removes the battery from the device and carries it, or carries the battery pack as a spare when the battery runs out.

[0003] When the chance of carrying the battery pack increases in this way, for example, vibration or impact is given to the battery pack in a bag or the battery pack is accidentally dropped when being held in a hand. May be lost.

When vibration or impact is applied to the battery pack,
The electrolyte may leak from the battery contained in the battery pack. Multiple batteries in a battery pack,
If a circuit board or the like on which a protection circuit for charging and discharging is mounted is installed, a short circuit may occur between batteries or the protection circuit may be destroyed. Also, if the electrolytic solution leaks out of the battery pack, it may be particularly dangerous if the electrolytic solution is an alkaline aqueous solution or an organic solvent.

For this reason, for example, Japanese Utility Model Laid-Open Publication No. 64-34756.
As disclosed in Japanese Patent Application Laid-Open Publication No. H10-260, there is known an assembled battery provided with an electrolyte absorbent. FIG. 1 shows an assembled battery disclosed in this publication. The battery pack 1 has a total of 10 cylindrical batteries 2 in two rows of 5 each, and a total of 10 batteries are stored on both sides of the two rows of batteries 2 so as to be in contact with the sides of the five batteries 2. Is provided.

[0006] However, the electrolyte absorbent 6 disclosed in this publication may not be able to sufficiently absorb the leaked electrolyte. In other words, as shown in FIG. 2, the structure of the battery 2 is such that the electrode plate and the electrolytic solution are put in a bottomed cylindrical outer can, and then the opened one end is sealed with a sealing plate via packing.
The electrode cap 21 is mounted on the sealing plate. Therefore, when vibration or shock is applied to the battery, the electrolyte may leak from the electrode cap 21 and the periphery of the packing. In the case of the above-mentioned publication, the electrolyte absorbing agent 6 abuts on the side surface of the cylindrical battery and does not abut on the periphery of the electrode cap. There are drawbacks.

[0007]

SUMMARY OF THE INVENTION Accordingly, the present invention is intended to alleviate the occurrence of vibrations and shocks in a battery pack to prevent electrolyte leakage, and to prevent electrolyte leakage. However, an object of the present invention is to provide a battery pack having an electrolyte absorbing agent that can sufficiently absorb an electrolyte solution and that can be easily mounted in the battery pack.

[0008]

According to the present invention, there is provided a battery pack comprising a battery having a protruding electrode cap at one end in a longitudinal direction and a case containing the battery. An electrolytic solution absorbent is disposed between the electrode cap of the battery and the opposing case inner wall, and the electrolytic solution absorbent is formed in a ring shape having a space through which the convex electrode cap is inserted. It is characterized by the following.

[0009] Further, the electrolytic solution absorbent is characterized in that a resin substrate is attached to the side facing the inner wall of the case.

[0010]

According to the present invention, since the ring-shaped electrolyte absorbing agent is provided around the electrode cap, vibrations and impacts around the electrode cap where electrolyte leakage is likely to occur can be reduced. Can be. Further, even if the electrolyte leaks from the periphery of the electrode cap, the electrolyte absorber absorbs the electrolyte before flowing out to the internal space of the battery pack or the printed circuit board contained therein.

Further, since the electrolyte absorbent of the present invention is formed in a ring shape so as to penetrate the electrode cap, the thickness of the electrolyte absorbent can be absorbed by the height of the electrode cap, and extra The electrolyte absorbent can be stored in the battery pack without requiring a large space.

Further, since the resin substrate is attached to the electrolyte absorbent on the side facing the inner wall of the case, the electrolyte absorbent is caught on the inner wall of the case when the electrolytic absorbent is inserted into the case. And the electrolyte absorbent is not damaged.

[0013]

An embodiment of the present invention will be described with reference to the drawings.
The main body case of the battery pack according to the present invention includes a box-shaped main body case 1A having one open side, and a lid case 1B of the main body case 1A. On the side surface of the main body case 1A, there are provided a groove 11 for engagement with a device main body such as a personal computer or a mobile phone to which the battery pack is mounted as a power source, and a terminal window 12 for the battery pack. Similarly, the terminal window 12 is provided in the lid case 1B, and two small holes 13 are formed. This small hole 1
Reference numeral 3 is for inserting tester pins or the like in order to check the internal circuit from the outside after assembling the battery pack. After the check, the small hole 13 is covered with a label or the like and hidden.

Inside the main body case, three cylindrical lithium ion batteries 2 are arranged. The lithium ion battery 2 is provided with an electrode cap 21 at one end in the longitudinal direction. The other end in the longitudinal direction and the outer can constitute the other electrode. The three lithium ion batteries 2 housed in the main body case are alternately arranged in the opposite direction and are all electrically connected in series.

A protection circuit is connected to the lithium ion battery 2, and the protection circuit is mounted on the printed circuit board 3. The printed circuit board 3 has substantially the same length as the length of the battery, and is arranged side by side on the battery. The printed circuit board 3 is provided with terminals 31 exposed from the terminal windows 12. The battery 2 and the printed board 3 are electrically connected by a conductive foil printed on the flexible printed board 4. The flexible printed circuit board 4 has substantially the same length as the length of the battery, and is disposed on a surface orthogonal to the printed circuit board 3. A current fuse or a thermal fuse 41 is mounted on the flexible printed circuit board 4.
The fuse 41 is cut out of the substrate 4 and arranged on the battery side so as not to protrude out of the substrate 4. This gives 2
Since the fuse can be arranged between the valleys of the battery, the dead space can be effectively used, and when the thermal fuse is arranged, the battery can be brought into close contact with the battery so that the temperature of the battery can be easily picked up. Spacers 5 for fixing the batteries are provided between the three batteries.

An electrolyte absorbent 6 is disposed at each of both ends of the lithium ion battery 2 in the longitudinal direction. The electrolyte absorbent 6 has a shape in which three rings are connected so as to follow the outer shape of the battery 2, and the hollow portion of the electrolyte absorbent 6 is sized to just fit the electrode cap 21 of the battery 2. ing. As shown in FIGS. 4 and 5, the electrolytic solution absorbent 6 is composed of a cushion 61 made of a polymer material for reducing vibration and shock or absorbing the electrolytic solution, and a resin substrate 62 made of UL fiber. ing. Cushion 6
1 and the resin substrate 62 are adhered to each other with a double-sided tape. The cushion 61 has a double-sided tape attached to the opposite side of the resin substrate 62 so as to be attached to the battery 2.

The electrolyte absorbent 6 is attached to both ends of the battery 2 respectively. When attached to the battery 2, the electrode cap 21 is inserted exactly. Since the thickness of the electrolyte absorbent 6 is substantially the same as or lower than the height of the electrode cap 21, the overall shape of the battery pack is not increased.

The resin substrate 62 provided on the electrolyte absorbent 6
Is made of a material that is sufficiently harder than the cushion 61 and has a low coefficient of friction. Therefore, after attaching the electrolyte absorbent 6 to the battery and mounting the battery in the main body case, the electrolyte absorbent is Do not get caught. For this reason, it becomes difficult to insert the battery and the electrolyte absorbent is not damaged.

[0019]

According to the present invention, since the ring-shaped electrolyte absorbing agent is provided around the electrode cap, vibrations and shocks around the electrode cap, which is likely to cause electrolyte leakage, are reduced. can do. Further, even if the electrolyte leaks from the periphery of the electrode cap, the electrolyte absorber absorbs the electrolyte before flowing out to the internal space of the battery pack or the printed circuit board contained therein.

Further, since the electrolyte absorbent of the present invention is formed in a ring shape so as to penetrate the electrode cap, the thickness of the electrolyte absorbent can be absorbed by the height of the electrode cap, and extra The electrolyte absorbent can be stored in the battery pack without requiring a large space.

Since the resin substrate is attached to the electrolyte absorbent on the side facing the inner wall of the case, when the electrolyte absorbent is inserted into the case, the electrolyte absorbent is hooked on the inner wall of the case and inserted. And the electrolyte absorbent is not damaged.

As a result, it is possible to provide a battery pack that is resistant to vibration and impact without increasing the external shape of the battery pack or complicating assembly and the like, and is suitable for carrying.

[Brief description of the drawings]

FIG. 1 shows a battery pack containing a conventional electrolyte absorbent.

FIG. 2 is a partially cutaway sectional view of a lithium ion battery.

FIG. 3 is an exploded perspective view of the battery pack of the present invention.

FIG. 4 is a perspective view of an electrolyte absorbent.

FIG. 5 is a cross-sectional view of an electrolyte absorbent.

[Explanation of symbols]

 1A Body Case 1B Lid Case 2 Lithium-ion Battery 21 Electrode Cap 3 Printed Circuit Board 4 Flexible Printed Circuit Board 5 Spacer 6 Electrolyte Absorbent 61 Cushion Material 62 Resin Board

Claims (2)

[Claims] 1. A battery pack comprising a battery having a convex electrode cap at one end in a longitudinal direction, and a case containing the battery, wherein a battery is provided between an electrode cap of the battery and an opposing case inner wall. A battery pack, wherein an electrolyte absorbent is arranged, and the electrolyte absorbent is formed in a ring shape having a space through which the convex electrode cap is inserted. 2. The battery pack according to claim 1, wherein the electrolyte solution absorbent has a resin substrate attached to a side facing the inner wall of the case.