JPH0664359U - Battery - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a battery having an explosion-proof mechanism capable of coping with a rapid increase in internal pressure. [Structure] Diamond-shaped cutting teeth 2 are formed inside a terminal 1 (lower side in FIG. 2). By doing this, the thin plate 3 becomes the cutting teeth 2
When it expands after passing through the maximum wide portion 2a, a sufficient discharge space 6 is obtained between the thin plate 3 and the cutting teeth 2, and the internal pressure is instantaneously discharged through the discharge space 6. [Effect] The battery does not burst even if the internal pressure of the battery rises sharply during misuse. Moreover, since it is easy to manufacture, it is excellent not only in safety but also in economy.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a battery having an explosion-proof mechanism that can cope with a sudden increase in internal pressure.

[0002]

[Prior art]

 FIG. 4 is a front view showing an example of a conventional battery explosion-proof mechanism.

Generally, when the battery is charged by plus / minus reverse insertion, the battery is over-discharged by mixing old and new batteries, or the battery is mistakenly used such as short circuit, the internal pressure is abnormally increased due to gas generation or heat generation. For this reason, an explosion-proof mechanism is required to prevent the battery from bursting even if it is misused.

Conventionally, as this explosion-proof mechanism, as shown in FIG. 4, triangular cutting teeth 2 are formed inside a terminal 1, and a thin plate 3 expands outward as the internal pressure rises. In this case, a mechanism has been widely used in which the pressure release hole 5 penetrates the thin plate 3 by the cutting teeth 2 and the internal pressure is released through the pressure release hole 5 to prevent the battery from bursting.

[0005]

[Problems to be solved by the device]

 However, in this case, when the internal pressure of the battery suddenly rises, the pressure release hole 5 penetrates the thin plate 3, but most of the pressure release hole 5 is closed by the cutting teeth 2. Since a sufficient discharge space could not be obtained between the thin plate 3 and the cutting teeth 2, the rising pressure could not be released, and in the worst case there was a risk of bursting.

Further, in order to avoid such a situation, an explosion-proof mechanism using a laminated film has been proposed, but there is a disadvantage that not only the number of parts is large and the number of steps is long, but also the manufacturing cost is significantly increased.

In view of the above circumstances, an object of the present invention is to provide a battery that can sufficiently release the suddenly increased internal pressure during misuse and can be manufactured at a low cost. To do.

[0008]

[Means for Solving the Problems]

 That is, according to the present invention, when the internal pressure rises, the thin plate (3) is expanded, the pressure release hole (5) is penetrated through the thin plate by the cutting teeth (2), and then the pressure release hole is passed through. A battery having an explosion-proof mechanism that prevents rupture due to an increase in internal pressure by releasing the internal pressure, wherein the cutting teeth are located at the maximum in the middle portion in the expansion direction of the thin plate (arrow A, B direction). The shape has a wide portion (2a), and the width (W1) of the maximum wide portion is made wider than the width (W2) of the base by 0.1 mm or more.

It should be noted that the numbers in parentheses are for convenience of representing corresponding elements in the drawings, and therefore the present invention is not limited to the description in the drawings. The same applies to the "Claims for utility model registration" and "Action" columns.

[0010]

[Action]

 With the above structure, the present invention provides a sufficient discharge space (6) between the thin plate and the cutting teeth when the thin plate (3) expands by passing through the maximum wide portion (2a) of the cutting teeth (2). Is obtained, and the internal pressure is instantaneously released through the discharge space.

[0011]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view showing an embodiment of a battery explosion-proof mechanism according to the present invention, FIG. 2 is a front view showing a state in which the internal pressure of the battery suddenly rises, and FIG. 3 is a battery explosion-proof mechanism according to the present invention. It is a front view which shows another Example of a mechanism.

As shown in FIG. 1, the battery according to the present invention has a terminal 1 made of a stainless steel plate, and diamond-shaped cutting teeth 2 are formed inside the terminal 1 (lower side in FIG. 1). There is. Therefore, a maximum wide portion 2a having a width W1 is formed in the substantially central portion of the cutting tooth 2. The width W1 of the maximum wide portion 2a is larger than the width W2 of the base portion by 0.1 mm or more. Further, below the cutting teeth 2, a thin plate 3 made of a stainless plate is provided.

Since the battery according to the present invention has the above-mentioned configuration, it is possible to reliably prevent the battery from bursting when it is misused. That is, when the internal pressure of the battery rises due to the misuse of the battery, the thin plate 3 expands outward, that is, in the direction of arrow A, and the pressure release hole 5 penetrates the thin plate 3 by the cutting teeth 2 to release the pressure. Internal pressure is released through the hole 5. As a result, the rupture of the battery is prevented, but when the internal pressure rises slowly, most of the pressure release hole 5 is covered by the cutting teeth 2 as shown by the phantom line in FIG. Even in the closed state, the operation of releasing the rising pressure through the pressure release hole 5 is performed as usual. When the internal pressure rises sharply, as shown in FIG. 2, the degree of bulging of the thin plate 3 becomes large, and the thin plate 3 passes through the maximum wide portion 2a of the cutting tooth 2 and goes upward in FIG. Direction). As a result, a sufficient discharge space 6 is obtained between the thin plate 3 and the cutting teeth 2, and the rapidly rising internal pressure is instantaneously discharged through the discharge space 6. Therefore, even if the internal pressure of the battery rises rapidly, it will not explode.

In the above-described embodiment, as shown in FIG. 1, the description has been given of the case where the cutting teeth 2 formed inside the terminal 1 are rhombic, but the shape of the cutting teeth 2 is not limited to this. The shape of the cutting teeth 2 is not limited to the rhombus shape, and the cutting teeth 2 may have any shape as long as it has the maximum wide portion 2a in the middle portion in the directions of the arrows A and B, which are the expansion directions of the thin plate 3. For example, as shown in FIG. 3, it is possible to form the arrow-shaped cutting teeth 2 inside the terminal 1.

In order to confirm the above-mentioned effects, a cylindrical lithium battery having an inside-out structure having diamond-shaped cutting teeth 2 as shown in FIG. 1 (Example 1) and an arrow as shown in FIG. Cylindrical lithium batteries (Example 2) having an inside-out structure having incised teeth 2 were manufactured in units of 20 and 10 of them were put into a fire to check the number of ruptures. Each piece was charged at a constant voltage of 24 V and the number of bursts was examined. Similarly, for 20 conventional cylindrical lithium batteries with an inside-out structure having triangular shaped cutting teeth 2 as shown in FIG. 4, the number of ruptures at the time of charging into a fire and constant voltage charging was compared. Examined. In Examples 1 and 2 and Comparative Example, the terminal 1 had a thickness of 0.3 mm, and the thin plate 3 had a thickness of 0.08 mm.

As a result, in the case of throwing into the fire, 4 out of 10 batteries (40%) burst in the comparative example, whereas all the burst batteries in Examples 1 and 2 did not occur. There wasn't. Further, in the case of constant voltage charging, 7 out of 10 batteries (70%) burst in the comparative example, whereas no bursted batteries in Examples 1 and 2. That is, it can be said that the first and second embodiments are provided with the explosion-proof mechanism capable of coping with the rapid increase in the internal pressure of the battery.

Also, when manufacturing the battery according to the present invention, it is only necessary to change the shape of the cutting teeth 2 from the conventional triangular shape to a rhombic shape or an arrow shape, so that it is possible to suppress an increase in manufacturing cost. Is.

[0019]

[Effect of device]

 As described above, according to the present invention, when the internal pressure rises, the thin plate 3 is expanded and the pressure release hole 5 is penetrated through the thin plate 3 by the cutting teeth 2, and then the pressure release hole 5 is removed. A battery having an explosion-proof mechanism for preventing rupture due to an increase in internal pressure by releasing internal pressure via the cutting tooth 2 in the expansion direction of the thin plate 3 (for example, arrows A and B in FIG. 1). The width W1 of the maximum wide portion 2a is set to be 0.1 mm or more wider than the width W2 of the base portion. When the thin plate 3 passes through the maximum wide portion 2a of the cutting tooth 2 and expands, a sufficient discharge space 6 is obtained between the thin plate 3 and the cutting tooth 2, and the internal pressure is instantly increased through the discharging space 6. As it is released, the battery will not Safety it is possible to prevent the occurrence of a situation in which the crack in advance is rather high, and it is possible and the child provides an excellent battery in economy and can be manufactured at a low cost.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a battery explosion-proof mechanism according to the present invention.

FIG. 2 is a front view showing a state when the internal pressure of the battery is rapidly increased.

FIG. 3 is a front view showing another embodiment of the battery explosion-proof mechanism according to the present invention.

FIG. 4 is a front view showing an example of a conventional battery explosion-proof mechanism.

[Explanation of symbols]

 1 ...... Terminal 2 ...... Cutting teeth 2a ...... Maximum wide part 3 ...... Thin plate 5 ...... Pressure release hole 6 ...... Release space W1 ...... Maximum wide part width W2 ...... Base width

Claims (1)

[Scope of utility model registration request] 1. When the internal pressure rises, the thin plate (3) is expanded, the pressure release hole (5) is penetrated through the thin plate by the cutting teeth (2), and then the internal pressure is passed through the pressure release hole. Is a battery having an explosion-proof mechanism for preventing rupture due to an increase in internal pressure by discharging the gas, wherein the cutting teeth have a maximum wide portion (2a) at an intermediate portion in the expansion direction of the thin plate. A battery, wherein the width (W1) of the maximum wide portion is 0.1 mm or more wider than the width (W2) of the base portion.