JP2003297315A - Battery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a battery capable of preventing solder from being forced out from a connecting land on a protective circuit board. <P>SOLUTION: A nickel block 34 is stuck onto the connecting land 32 of the protective circuit board 30 by soldering, and the leads 11, 21 of the battery 1 are fused onto this nickel block 34. On this nickel block 34, a leg part 36 is protrusively provided on its sticking surface 35 to be stuck to the connecting land 32. According to this structure, a gap for the protruded height of the leg part 36 is secured between the sticking surface 35 and the connecting land 32. Therefore, even if the nickel block 34 is heated when welding the leads 11, 21, and solder 33 is melted away by this heat, the solder 33 can stay in the gap without being smashed by the nickel block 34. Thereby, the solder 33 can be prevented from being forced out from the connecting land 32. <P>COPYRIGHT: (C)2004,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery provided with a protection circuit board for protecting the battery. 2. Description of the Related Art Generally, a lithium ion secondary battery having a high energy density is provided with a protection circuit board for protecting a battery body from overcharge, overdischarge, and the like. FIG. 4 shows a battery 100 provided with a protection circuit board 101. The protection circuit board 101 is one in which electronic components are mounted on a printed board on which a predetermined circuit pattern is formed. A part of the circuit pattern is a connection pad 102, and a nickel block 103 is fixed on the connection pad 102 by soldering.
Then, the battery body 10 is placed on the nickel block 103.
Four leads 105 are connected by spot welding. However, when the lead 105 is connected to the nickel block 103, the nickel block 103 is heated by spot welding, and the heat may melt the solder 106. .
In such a case, if the softened solder is crushed by its own weight of the nickel block 103 and pressurization at the time of spotting and protrudes from the connection pad 102, a short circuit with an adjacent conductor circuit or electronic component may occur. (See FIG. 5). In particular, with the recent demand for miniaturization of batteries, circuit patterns on the protection circuit board 101 have been increased in density, and small and thin nickel blocks 103 have been used. Was noticeable. [0005] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a battery capable of preventing solder from protruding from a connection land on a protection circuit board. According to a first aspect of the present invention, there is provided a battery including a battery body and a protection circuit board for protecting the battery body. Wherein the lead derived from the battery body is welded to the intermediate connection member soldered to the connection land of the protection circuit board, wherein the intermediate connection member has a surface facing the connection land. Is characterized in that a leg portion for projecting and supporting the intermediate connecting member with a gap to the connecting land is provided. According to the first aspect of the present invention, a leg portion is provided on a surface of the intermediate connection member facing the connection land of the protection circuit board. In between, a gap corresponding to the protruding height of the leg is ensured. Therefore, even when the solder is melted by the heat at the time of spot welding, the solder can remain in the gap without being crushed by the intermediate connection member. Thereby, it is possible to prevent the solder from protruding from the connection land. An embodiment of a protection circuit board and a battery according to the present invention will be described below in detail with reference to FIGS. FIG. 1 shows a battery 1 of the present embodiment.
The battery body 2 of the battery 1 is a rectangular lithium ion secondary battery. The battery body 2 includes a battery can 3 formed in the shape of a bottomed rectangular container using aluminum.
The power generation element is housed inside. The opening of the battery can 3 is closed by welding the lid 4. A negative electrode terminal 5 penetrating through the cover 4 is attached to the cover 4 via an insulating material. A thin plate-shaped clad material 8 is attached to the bottom surface 6 of the battery can 3.
The clad material 8 is formed by rolling aluminum on a thin plate-shaped substrate made of nickel, and is welded to the bottom surface 6 such that the aluminum surface side is in contact with the bottom surface 6. In the following description, the lid 4 side (upper left direction in the figure) of the battery 1 is referred to as front, and the bottom surface 6 side (lower right direction in the figure) is referred to as rear. Although not shown, the power generating element housed in the battery can 3 is formed by laminating a positive electrode plate and a negative electrode plate with a separator interposed therebetween and winding them. A positive electrode lead is led out from the positive electrode plate and is welded to the bottom of the battery can 3, whereby the entire battery can 3 serves as a positive electrode terminal. Further, a negative electrode lead is led out from the negative electrode plate, and is welded to a negative electrode terminal 5 provided on the lid 4. The battery body 2 includes a protection circuit board 30 described later.
Are connected to each other. The leads 11 and 21 are formed by stamping and bending a nickel plate, and include a short plus lead 11 and a long minus lead 21. The plus lead 11 has a strip-shaped base 1
2 and a connecting piece 13 protruding from the base 12. The positive lead 11 is disposed at a position near one end (left end in FIG. 1) of the bottom surface 6 of the battery body 2, and the base 12 is welded to the clad material 8 by spot welding. The connection piece 13 extends upward from a position from the left end on the upper side of the base portion 12, is bent at a right angle from a connection portion with the base portion 12, and projects rearward. It has been. On the other hand, the minus lead 21 is provided with a long strip-shaped base portion 22 and a connecting piece 23 protruding from the base portion 22. The base portion 22 has an overall length slightly longer than the length of the side surface 7 of the battery body 2 and is bent at a position slightly centered from one end thereof to have an L-shape. The battery lead 2 is disposed on the bottom surface 6 of the battery body 2 along the end (right end in FIG. 1) and the side 7 opposite to the side where the plus lead 11 is welded. Adhered to. The insulating tape 24 is interposed between the battery can 3 as a positive electrode terminal and the negative lead 21 to prevent the battery 1 from short-circuiting due to direct contact between the two. The rear end of the base 22 is connected to the negative terminal 5 via the protection element 25. A connection piece 23 having the same shape as the connection piece 13 of the plus lead 11 is provided in a portion of the minus lead 21 that is adhered to the bottom surface 6 of the battery body 2. A protection circuit board 30 for preventing the battery 1 from being overcharged or overdischarged is connected to the battery body 2. The protection circuit board 30 is formed by forming a predetermined circuit pattern on a rectangular printed board 37 having substantially the same size as the bottom surface 6 of the battery body 2 and mounting an electronic component 31 thereon. A part of the circuit pattern is a connection land 32 to which a pair of nickel blocks 34 (corresponding to an intermediate connection member of the present invention) for connection with the leads 11 and 21 are fixed. The nickel block 34 is formed in a rectangular shape by a nickel plate (see FIG. 2). One of the front and back surfaces of the nickel block 34 is connected to the connection land 3.
The fixing surface 35 is fixed to the fixing surface 3.
5, semi-spherical legs 36 are respectively provided at positions slightly inside the four corners. This leg 36
Is formed, for example, by pushing a rod-shaped metal fitting from the surface of the nickel block 34 opposite to the fixing surface 35. The nickel block 34 has a fixing surface 35
Is fixed to the connection land 32 by soldering so that the connection land 32 faces the connection land 32 side. Then, on the upper surface side of the nickel block 34, the connection pieces 13 of the respective leads 11 and 21,
23 are welded by spot welding. Next, the operation and effect of the present embodiment configured as described above will be described. As described above, the nickel block 34
Is fixed to the connection land 32 by soldering with the fixing surface 35 facing the connection land 32 side. At this time,
Since the leg portion 36 is formed on the fixing surface 35, a gap corresponding to the protruding height of the leg portion 36 is secured between the fixing surface 35 and the connection land 32. It is in a buried state (see FIG. 3A). The nickel block 34 has leads 11
When connecting 21, the connection pieces 13, 23 of the leads 11, 21 are first applied to the upper surface of the nickel block 34. Then, the nickel block 34 and the connection pieces 13 and 23 are welded by performing spot welding (see FIG. 3B). At this time, the nickel block 34 is heated by spot welding, and the heat may melt the solder 33. However, a gap corresponding to the protruding height of the leg portion 36 is secured between the fixing surface 35 and the connection land 32 by the leg portion 36. Therefore, solder 3
3 can remain in this gap without being crushed by the nickel block 34. Thereby, the protrusion of the solder 33 from the connection land 32 can be prevented. The technical scope of the present invention is not limited by the above-described embodiment. For example, the followings are also included in the technical scope of the present invention. In addition, the technical scope of the present invention extends to an equivalent range. 1) According to the present embodiment, four legs 36 are provided, but the number of legs is not limited to this embodiment, and may be three or less, or five or more. 2)
According to the present embodiment, the legs 36 are formed slightly inside the four corners of the fixing surface 35, but according to the present invention, the formation positions of the legs are not limited to the present embodiment, It may be formed at any position within the fixing surface.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a battery according to the present embodiment. FIG. 2 (A) is a bottom view of a nickel block. FIG. 3 (B) is a side view of a nickel block. (B) Side view showing a state where leads are welded to a nickel block. [FIG. 4] Partial enlarged view of a conventional battery. [FIG. 5] (A) Soldering a nickel block onto a connection land. (B) Side view showing the state in which the solder protrudes from the connection land [Description of References] 1 ... Battery 2 ... Battery body 11 ... Plus lead (lead) 21 ... Minus lead (lead) 30 ... Protection circuit board 32 Connection land 34 Nickel block (intermediate connection member) 36 Leg

Claims (1)

Claims: 1. A battery body, and a protection circuit board for protecting the battery body, wherein an intermediate connection member soldered to a connection land of the protection circuit board includes: The lead led out from the battery main body is welded, and a surface of the intermediate connection member facing the connection land supports the intermediate connection member with a gap with respect to the connection land. Characterized in that legs for projecting are provided.