JP3652410B2 - Battery pack - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a battery pack that can be configured without requiring a complicated process and is easy to handle with mechanical reinforcement.
[0002]
[Prior art]
A power supply component composed (formed) of a plurality of batteries (unit cells) is called a battery pack (pack battery) and is widely used in practical use. Here, the battery pack generally has a structure in which a plurality of unit cells, a wiring circuit for electrically connecting these unit cells, a safety element, a contact terminal, etc. are built in a case having electrical insulation. It has become. Conventionally, such a power supply component has been mainly a primary battery, but recently its status has shifted to a chargeable / dischargeable secondary battery, and its use has expanded year by year and demand has increased. And this type of battery pack generally has the following structure. That is, a split-type battery pack container piece, a plurality of unit cells mounted and arranged in one split-type battery pack container piece, a wiring circuit that electrically connects the unit cells, and a connection to the wiring circuit FuSo the external connection terminal portion disposed to derive the wall portion of the battery pack container pieces and, on the connection surface of the one battery pack container piece, corresponding to the unit cell and the wiring circuit by integrating the connection surface The structure which has the other battery pack container piece to do and the exterior label stuck on the said battery pack container single side | surface is taken. The battery pack container pieces are integrated with each other by engagement (fitting) of irregularities formed on the respective connected surfaces, ultrasonic welding (when made of resin), or the like.
[0003]
[Problems to be solved by the invention]
However, in the case of the battery pack having the above configuration, the following inconvenience is recognized. First, on the connected surface of the battery pack container piece, an uneven portion having an engagement (fitting) relationship is preliminarily formed, and when this uneven portion is engaged (fitted) and integrated, The battery pack container is required to be liquid-tight in order to avoid or reduce the influence of outside air such as a certain protective function such as waterproofness. For such liquid-tight, be required to be connected faces of the battery pack container pieces are integrated by engagement to the liquid-tight, in order to do this, the dimensions of the concave-convex portion to be engaged with each other The accuracy is important, and the complexity of processing corresponding to this dimensional accuracy and the significant cost increase are practically serious problems.
[0004]
On the other hand, when ultrasonically welding the connected surfaces of the battery pack container pieces made of resin, liquid-tight sealing itself is relatively easy, but not only special equipment is required, but also ultrasonic welding condition selection and Setting is complicated and cost is problematic.
[0005]
In addition, this type of battery pack is required to be lightweight and thin, and the thickness of the battery pack container is desired to be as thin as possible. By the way, this reduction in the wall thickness affects the connection strength between the connected surfaces of the battery pack container piece, and the connection part may be damaged during the handling and operation process. Sexuality is impaired.
[0006]
The present invention has been made in view of the above circumstances, and an object thereof is to provide a battery pack that is easy to handle, has high reliability, and can be easily realized in mass production.
[0007]
[Means for Solving the Problems]
The present invention relates to a battery pack container fitted in a separable state at an uneven portion formed on a connection surface of a split piece , a plurality of unit cells mounted in the battery pack container, and the unit cells A wiring circuit that is electrically connected , an external connection terminal portion that is connected to the wiring circuit and led out to a wall portion of the battery pack container, and at least each of the divided pieces of the battery pack container is fitted. It is a battery pack characterized by comprising the exterior label stuck over the joint part .
[0008]
The battery pack container according to the present invention may be made of, for example, a metal made of stainless steel or the like, or a surface-treated metal, but generally, for example, polytetrafluoroethylene, polytetrafluoroethylene, polyvinyl fluoride, Examples include synthetic resins such as polyvinylidene fluoride, polyethylene, polypropylene, polyvinylidene chloride and polyvinyl chloride, chlorinated rubber, methyl rubber, polyisoprene, polybutadiene, butyl rubber, SBR, NBR, polyisobutylene, chloroprene, and neoprene. That is, in consideration of processability, mass productivity, cost, etc., a box shape made of synthetic resin is preferable, and in consideration of an operation for integrating into a container, the number of divided pieces is set as small as possible, for example, two divided pieces. Is desirable.
[0009]
In the present invention, the battery pack container pieces are joined primarily by engaging the concavo-convex surface and secondarily by covering and sticking the exterior label. That is, the battery pack container pieces are mechanically joined and integrated by engagement of unevenness formed on the joined surfaces, and the joined region is liquid-tight or joined by an exterior label attached to the cover. Unity is reinforced. Therefore, even if the dimensional accuracy of the unevenness processing of the bonded surface is slightly insufficient, it will be sufficiently supplemented by the effective use form of the exterior label, and not only can be manufactured with high yield, but also a highly reliable battery Act as a pack.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1, 2A and 2B, and FIG.
FIG. 1 is a perspective view showing a schematic configuration of the battery pack according to this embodiment. In FIG. 1, reference numeral 1 denotes a battery pack container integrated by engagement of uneven portions formed on the connected surfaces of the divided pieces 1 a and 1 b, and 2 is integrally disposed on one side wall part of the battery pack container 1. The external connection terminals 3 and 3 are exterior labels that are attached so as to cover the region surfaces including the connected portions 1c of the split pieces 1a and 1b that form the battery pack container 1.
[0011]
2 (a) and 2 (b) are exploded views of the internal structure of the battery pack shown in FIG. 1, and FIG. 2 (a) is a group of unit cells 4 and wiring for connecting these unit cells 4. FIG. 2B is an end view showing a connection state between the unit cells 4. In this configuration example, for example, a nickel metal hydride battery is used as the unit cell 4, the connection piece 5 a that connects the adjacent (built-in) unit cells 4, and the unit cell group 4 connected by the connection piece 5 a. A wiring circuit 5 is formed by a wiring portion 5b that connects to the external connection terminal 2.
[0012]
FIG. 3 schematically shows the state of the connected surfaces of the divided pieces 1a and 1b forming the battery pack container 1, and the connected surfaces of the divided pieces 1a and 1b forming the battery pack container 1 are shown in FIG. The concavo-convex portions 1c ′ that engage with each other are formed, and mechanical integration is achieved by the engagement (fitting) of the concavo-convex portions 1c ′. In other words, the division pieces 1a and 1b form a primary connection by integration by the engagement of the concavo-convex portion 1c ′, and at the same time, the drop strength is improved at least in the direction parallel to the engagement surface. Further, in the present invention, when attaching the outer packaging label 3 of the battery pack, in particular, an area surface including the connected portion 1c of the divided pieces 1a and 1b forming the battery pack container 1 is selected, and this connected portion The area surface including 1c is covered and pasted. That is, the area surface which integrates temporarily connected to at engagement of the concave-convex portion 1c ', adopts a configuration in which further reinforce the connected part 1c performs stuck to cover the outer label 3.
[0013]
4 and 5 show the structure of the main part of another embodiment of the battery pack. That is, in the case of the battery pack shown in FIG. 1, and a battery pack container 1 integrated split pieces 1a was divided into two in the thickness direction, an uneven portion formed on the connecting surface 1b by engagement but if illustrated in FIG. 4, constitute a battery pack container 1 which is integrated with the engaging concave and convex portions formed on the connection surface of the split pieces 1a, 1b which is divided into two in the width direction. In this configuration example, as schematically shown in FIG. 5, the connection surface of the divided pieces 1 a and 1 b is formed with uneven portions 1 c ″, and the relationship between the uneven portions 1 c ″ is schematically shown. Mechanical integration is achieved by joining (fitting), and the exterior label 3 is attached so as to cover the area surface including the connected portion 1c.
[0014]
By adopting the configuration as described above, the protective functions including the mechanical and moisture resistance of the battery pack are improved, and the battery pack functions as a battery pack that is easy to handle and highly reliable. In addition, the adoption of the above-described configuration has the advantage that no complicated operation or special equipment is required, and that the yield can be improved.
[0015]
In addition, this invention is not limited to the said Example, A various deformation | transformation can be taken in the range which does not deviate from the meaning of invention. For example, the unit cell (built-in) may be a nickel cadmium battery instead of a nickel metal hydride battery, and the number thereof may be appropriately selected.
[0016]
【The invention's effect】
As described above, according to the battery pack of the present invention, the battery pack container pieces are mechanically joined and integrated by the engagement of the unevenness formed on the joined surface, and the joined region is covered. The liquid-tightness and joint integrity are reinforced by the stuck exterior label. Therefore, even if the dimensional accuracy of the unevenness processing of the bonded surface is slightly insufficient, it will be sufficiently supplemented by the effective use form of the exterior label, and not only can be manufactured with high yield, but also a highly reliable battery Pack can be provided.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a schematic configuration example of a battery pack of the present invention.
2 is an exploded view of the inside of the battery pack shown in FIG. 1, (a) is a layout plan view of the unit cells and the wiring circuit, and (b) is a side view showing a connection state between the unit cells.
3 is a schematic diagram showing a state of a connected portion between battery pack container pieces of the battery pack shown in FIG. 1; FIG.
FIG. 4 is a perspective view showing another schematic configuration of the battery pack of the present invention.
5 is a schematic view showing a state of a connected portion between battery pack container pieces of the battery pack shown in FIG. 4;
[Explanation of symbols]
1 …… Battery pack container
1a, 1b …… Battery pack container segment
1c …… Connected part
1c ′, 1c ″ …… Concavity and convexity 2 …… External connection terminal 3 …… Exterior label 4 …… Unit cell 5 …… Wiring circuit
5a …… Connection piece
5b …… Wiring 4 ……… Cover 5 ……… Exterior case

Claims (1)

A battery pack container fitted in a separable state at the concavo-convex portion formed on the connected surface of the split piece;
Wherein mounted in the battery pack container, and a wiring circuit for electrically connecting a plurality of unit cells and the battery cell,
An external connection terminal portion connected to the wiring circuit and led out to the wall portion of the battery pack container;
A battery pack comprising: an exterior label attached to at least a fitting portion of each divided piece of the battery pack container.

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