JPH10243565A - Electrode structure - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To make it possible to bring a thermistor close to the circumferential surface of a battery and to use a thermistor having a high degree of freedom in selecting performance. SOLUTION: In an electrode structure of a battery case for a rechargeable battery, an axial type thermistor 14 is used as a thermistor for detecting the temperature of the battery and controlling the charging based on the detection signal, and the metallic terminal plate 3 is connected to the battery 1. By forming a concave shape 12 corresponding to a valley formed between circumferential surfaces and fixing the axial lead portions 14a and 14b of the axial type thermistor 14 to the bottom surface 12a of the concave shape 12, a large-diameter thermosensitive element is formed. The portion 14c is brought close to the circumferential surface of the battery 1 to improve temperature detection accuracy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electrode structure of a battery case for a rechargeable battery.

[0002]

2. Description of the Related Art As shown in FIGS. 6 and 7, a conventional battery case for a rechargeable battery has a chip type thermistor as a thermistor for controlling charging while detecting the temperature of the battery 1 during charging. 32 were used.
The chip type thermistor 32 is soldered to a predetermined position on the lower surface of the discharge terminal and charge terminal pattern 33 of the flexible wiring board 31 via a jig, and the batteries housed in parallel and close to each other in the battery case. They were arranged facing each other in a valley formed between the circumferential surfaces.

[0003]

However, when the chip type thermistor 32 is soldered to the pattern 33 of the flexible wiring board 31 and is disposed in the valley between the batteries 1, the thermistor 32 and the circumferential surface of the battery 1 are arranged. Is too far away, the temperature detection accuracy is reduced. Also, even if an axial type thermistor is to be soldered instead of the chip type thermistor 32, since the diameter of the heat sensitive element portion is large, the flexible wiring board 31 is strongly bent so that the pattern is easily broken and the solder is easily peeled off. And the installation is extremely difficult. In addition, in the case of the chip type thermistor 32, the shape and performance are fixed, and there are few types.
In addition, there is a problem that the degree of freedom in procurement is small due to the high price.

Accordingly, the present invention has been made in view of the above-mentioned problems, and enables the thermistor to be close to the circumferential surface of the battery and allows the use of a thermistor of a type having a large degree of freedom in performance selection. It is an object of the present invention to provide an electrode structure.

[0005]

In order to achieve the above object, a first aspect of the present invention relates to a battery case for a rechargeable battery, in which the temperature of the battery is detected and charging is controlled by a detection signal. The thermistor is arranged in close proximity to the battery via a metal terminal plate. According to a second aspect of the present invention, an axial type thermistor is used as the charge control thermistor. The heat sensitive element portion of the axial type thermistor is held in the battery case by holding a lead portion of the axial type thermistor in a valley formed between battery circumferential surfaces arranged in parallel and close to each other in the battery case. The metal terminal plate is formed with a concave shape that allows the metal terminal plate to approach the peripheral surface.

According to the present invention, by attaching the thermistor to the concave portion formed on the metallic terminal plate, it is possible to determine the position of the thermistor by the rigidity of the metallic terminal plate and to form the large-diameter terminal. The heat-sensitive element portion of the axial type thermistor can be brought close to the circumferential surface of the battery.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show an embodiment of the present invention. FIG. 1 is a perspective view showing a state in which a thermistor is manually provided on a metal terminal plate in an electrode structure. FIG. 2 is an end view of FIG. 1, and FIG. 4 is a side view of the terminal plate, and FIG. 5 is a perspective view schematically showing an electrode structure in the battery case.

As shown in FIG. 5, an electrode structure 20 according to the present embodiment accommodates four rechargeable batteries 1 in a battery case 2 in parallel with the electrodes of the rechargeable batteries 1 connected in series. On one side, a metal terminal plate 3 having a terminal 4 and connected to a thermistor for detecting the temperature of the battery 1 is connected to the battery 1.

The terminal plate 3 is composed of four independent terminal plates 3a, 3b, 3c, 3d as shown in FIG. 3, and in this embodiment, the electrode structure 20 is manufactured at low cost. The four terminal plates 3a, 3b, 3c, 3d are formed by using the HS-BUS method conventionally used. That is, the terminal plate 3 is punched out with a press into a shape in which the terminal plates 3a, 3b, 3c, 3d are integrally connected by the connecting portions 6, 7, 8, and the terminal plates 3a, 3b, 3c, 3 around the terminal portion 4.
Affixing insulating paper 9 having terminal portions 4 opened to the front and back surfaces of d,
Insulating paper 10 is attached to the front and back surfaces of the lower terminal plates 3a, 3b, 3c and 3d except for the portion where the concave shape 12 is to be formed at the center of the terminal plate 3. Thereby, the terminal plates 3a, 3b, 3c, 3d are integrally connected via the insulating papers 9 and 10.

[0010] Thereafter, as shown in Fig. 4, the terminal portion 4 is formed into a slightly protruding shape, the thermistor hand-made portion is formed into a concave shape 12, and a hemispherical protruding portion 13 is formed at a lower end. Form. Further, the connecting portions 6, 7, 8 are punched out by a press and removed, so that the terminals 3a, 3b,
3c and 3d are independently formed. In this state, each terminal 3a,
3b, 3c and 3d are kept connected via insulating papers 9 and 10.

Next, the lower end portion of the terminal plate 3 is bent as shown by a two-dot chain line in FIG.
As shown in FIGS. 1 and 2, an axial type thermistor 14 is connected to the lead portions 14a and 14b with respect to the bottom surface 12a.
And the lead portions 14a, 14b are fixed to the bottom surface 12a by spot welding.

The axial type thermistor 14 fixed to the concave shape 12 of the terminal plate 3 as described above has its body 1
Since 4c has a large diameter, it can be brought close to the circumferential surface of the battery 1 as shown in FIG.

In this embodiment, each terminal 3a, 3
b, 3c, 3d are connected by insulating papers 9 and 10, but depending on the configuration of the battery case, the terminals 3a, 3b, 3c, 3d are replaced by connecting portions 6, 7, 8 instead of insulating paper. The connecting portions 6, 7, 8 may be cut off after being integrally fixed by a resin mold in the connected state.

[0014]

According to the present invention, it is possible to determine the position of the thermistor by its rigidity by using the metal terminal plate. Also, by fixing the lead of the axial type thermistor to the bottom of the metal terminal plate that is bent into a concave shape, it is possible to bring the large-diameter heat-sensitive element part close to the battery's circumferential surface, and to improve the temperature detection accuracy. improves. Further, since the lead of the axial type thermistor can be fixed to the metallic terminal plate by spot welding, it can be manufactured at a lower cost than soldering. Moreover, the axial type thermistor has a high degree of freedom in selecting the performance and is inexpensive, so that the procurement of parts becomes easy.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a state where a thermistor is manually provided on a metallic terminal plate in an electrode structure according to an embodiment of the present invention.

FIG. 2 is an end view of FIG. 2;

FIG. 3 is a plan view of a terminal plate.

FIG. 4 is a side view of the terminal plate.

FIG. 5 is a perspective view schematically showing an electrode structure in a battery case.

FIG. 6 is a perspective view showing a manually installed state of a thermistor in a conventional electrode structure.

FIG. 7 is an end view showing a manually installed state of a thermistor in a conventional electrode structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery 2 Battery case 3 Terminal board 4 Terminal 5 Thermistor 6, 7, 8 Connecting part 9, 10 Insulating paper 12 Concave shape 13 Hemispherical protrusion 14 Axial type thermistor 20 Electrode structure

Claims (3)

[Claims] 1. An electrode structure for a battery case for a rechargeable battery, wherein a thermistor for detecting the temperature of the battery and controlling charging based on the detection signal is disposed close to the battery via a metal terminal plate. . 2. The electrode structure according to claim 1, wherein an axial type thermistor is used. 3. The heat sensitive element portion of the axial type thermistor is held in a battery circle while holding the lead portion of the axial type thermistor in a valley formed between battery circumferential surfaces arranged in parallel and close to each other in the battery case. 2. The metal terminal plate having a concave shape which allows the metal terminal plate to be close to a peripheral surface.
The electrode structure as described.