JP2002164039A - Lithium-ion battery protection circuit and method of manufacturing the same - Google Patents

Abstract

(57) [Summary] (with correction) [PROBLEMS] To reduce the weight of a lithium-ion battery protection circuit. A resin substrate 51 on which electronic components 54 to 58 are mounted, terminals provided on both ends of the electronic component mounting surface of the resin substrate, and a waterproof resin 59 covering the entire surface of the resin substrate on the electronic component mounting surface side. In the lithium-ion battery protection circuit with the above, by making the hardness of the waterproof resin equal to or higher than that of the resin substrate, the strength can be provided by the resin substrate and the waterproof resin. A lithium-ion battery protection circuit and a method of manufacturing the same, which can be significantly reduced in weight as compared with a case where the strength is given.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lithium-ion battery protection circuit and a method for manufacturing the same.

[0002]

2. Description of the Related Art In FIGS. 7 to 9, reference numeral 1 denotes a resin substrate. A cathode terminal 2 is provided on one end of the upper surface of the resin substrate 1.
Is mounted, and electronic components 4, 5, 6, 7, and 8 for a lithium ion battery protection circuit are mounted on other portions, and the electronic components 4, 5, 6, 7, and 8 are covered with a waterproof resin 9. .
An anode terminal 3 is mounted on the lower surface of the resin substrate 1 at an end opposite to the cathode terminal 2. Since the waterproof resin 9 is usually prepared in advance in a mold and poured into the frame, as shown in FIG.
13 is vacant. On the lower surface side of the above lithium ion battery protection circuit, as shown in FIG.
6 is attached. External take-out terminals 14-1
6 is press-contacted with the contact pins 17 to 19 attached to the device side, so that a stress is applied to the resin substrate 1, and therefore, the resin substrate 1 has a certain thickness or more to withstand the stress.

[0003]

In this lithium ion battery protection circuit, since a resin substrate having a certain thickness or more is used, there is a problem that it is difficult to reduce the weight.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a lithium-ion battery protection circuit in which the thickness of a substrate is reduced and the weight is reduced.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a waterproof resin having the same hardness as or higher than that of the resin substrate. Instead, a thin material can be used, and the weight can be reduced as a whole.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is the one in which the hardness of the waterproof resin is equal to or higher than that of the resin substrate, so that the thickness of the resin substrate can be reduced to reduce the weight. It has the action of:

According to a second aspect of the present invention, there is provided the lithium ion battery protection circuit according to the first aspect, wherein the width of the terminal is substantially the same as the width of the resin substrate, wherein the terminal is connected in a horizontal state. By assembling the resin substrate in a state where the resin substrates are connected side by side and hardening the waterproof resin, and dividing the resin substrate into individual pieces of the lithium ion battery protection circuit, an inexpensive lithium ion battery protection circuit can be formed.

According to a third aspect of the present invention, there is provided the lithium ion battery protection circuit according to the first aspect, wherein the thickness of the terminal is substantially equal to the thickness of the waterproof resin, and the strength of the waterproof resin is easily made uniform. It has the action of:

According to a fourth aspect of the present invention, there is provided the lithium ion battery protection circuit according to the first aspect, wherein the ferrite powder is mixed into the waterproof resin, and the noise level generated from the lithium ion battery protection circuit is suppressed. By removing the noise suppression components to be mounted and reducing the area of the resin substrate, it is possible to further reduce the weight.

According to a fifth aspect of the present invention, there is provided the lithium ion battery protection circuit according to the first aspect, wherein the height of the waterproof resin is lower than that of the terminal. The overall height can be kept low.

According to a sixth aspect of the present invention, there is provided the lithium ion battery protection circuit according to the first aspect, wherein a filler is mixed in the waterproof resin. Strength as resin increases,
This makes it easier to suppress deformation of the resin substrate.

In the invention according to claim 7, since the surface of the resin substrate in contact with the waterproof resin is roughened, the bonding strength between the resin substrate and the waterproof resin is increased, whereby the waterproof resin for the resin substrate is increased. Is further enhanced.

Next, according to an eighth aspect of the present invention, the distance between the terminals of the resin substrate on which the electronic components are mounted at both ends is the same as that of the resin constituting the resin substrate, or more. Is a method of manufacturing a lithium ion battery protection circuit that is covered with a resin having high hardness, and the strength of a lower resin substrate can be increased simply by covering electronic components of the resin substrate with a waterproof resin.

Next, according to a ninth aspect of the present invention, the electronic components on the resin substrate are covered with a waterproof resin by utilizing the terminals at both ends as a part of a mold. According to the present invention, the configuration of the mold is simplified by utilizing the terminals on both sides as a part of the mold.

Embodiment 1 Hereinafter, a lithium-ion battery protection circuit according to Embodiment 1 of the present invention will be described with reference to the drawings.

1 and 2, reference numeral 51 denotes a substrate made of resin or the like. A cathode terminal 52 and an anode terminal 53 are mounted on both ends of the upper surface of the resin substrate 51, and electronic components 54, 55, 5 for protecting the lithium ion battery are provided therebetween.
6, 57, 58 are mounted, and the electronic components 54, 55,
Waterproof resin 59 covers 56, 57 and 58. After the waterproof resin 59 is poured into the frame with the anode and cathode terminals 52 and 53 as a frame, it is cured and formed.

FIG. 3 is a diagram showing a connection state when the lithium ion battery protection circuit according to the first embodiment of the present invention is incorporated in a device.

Electrode wires 73 and 74 from a lithium ion battery are connected to the terminals 52 and 53 of FIG. 3 by welding or the like, respectively. External extraction terminals 70, 71, 72 are attached to the lower surface of the resin substrate 51 for use when the lithium ion battery protection circuit is incorporated in the lithium ion battery and used in actual equipment.

The external extraction terminals 70, 71, 72
Is pressed against the contact pins 75 to 77 attached to the device side, so that a stress is applied to the resin substrate 51. In order to receive the stress even with the waterproof resin 59, the hardness of the waterproof resin 59 is the same as that of the resin substrate 51. , Higher than that.

As described above, the lithium ion battery protection circuit according to the present embodiment does not require the waterproof resin 59 to have releasability, as long as it has fluidity and strength after curing. If epoxy resin is used, the material becomes the same as that of the material of the resin substrate 51, and the weight can be significantly reduced. Reference numeral 78 denotes a substrate on which the contact pins 75 to 77 are implanted.

Hereinafter, a process of manufacturing the lithium ion battery protection circuit according to the embodiment of the present invention will be described.

The terminal 92 shown in FIG. 4 is formed by connecting the cathode terminal 52 shown in FIG.
These are continuous and formed in a strip shape with the width of 2, 53 combined, and are formed on the large substrate 91.

The electronic components 54 to 58 are mounted on the large board 91 where the terminals 92 and 93 are free, and the waterproof resin 100 is poured into the space between the terminals 92 and 93 and hardened. After curing, each lithium ion battery protection circuit
The electrode wires 73 and 74 are attached as described above, and thereafter, they are divided into individual pieces and manufactured. The terminals 92 and 93 and the waterproof resin 100
Have the same thickness.

(Embodiment 2) FIG. 6 shows the waterproof resin 5 of FIG.
The electronic component 5 for protecting the lithium-ion battery shown in FIG.
4, 55, 56, and 57, in which the noise suppression component 58 is omitted. Since the number of components is reduced, the size of the substrate 51 is reduced, and the weight can be further reduced.

In the above embodiment, the waterproof resin 59 is used.
The height of the cathode terminal 52 and the anode terminal 5 is as shown in FIG.
It is preferable to keep the height lower than 3, so that the overall height can be suppressed. In addition, if a filler such as ceramic or glass is mixed into the waterproof resin 59, the strength of the waterproof resin 59 can be further increased, so that the strength of the resin substrate 51 can be further increased. . Also, if the surface in contact with the waterproof resin 59 is roughened on the upper surface side of the resin substrate 51, the joint strength between the waterproof resin 59 and the resin substrate 51 is increased by this portion, whereby the resin substrate 5
1 can increase the strength.

[0026]

As described above, according to the present invention, the strength can be given by the thickness of the resin substrate, but the strength can be given by the resin substrate and the waterproof resin.

[Brief description of the drawings]

FIG. 1 is a perspective view of a lithium-ion battery protection circuit according to Embodiment 1 of the present invention.

FIG. 2 is a plan view of a lithium-ion battery protection circuit according to Embodiment 1 of the present invention.

FIG. 3 is a front view showing a connection state when the lithium-ion battery protection circuit according to Embodiment 1 of the present invention is incorporated in a device.

FIG. 4 is a plan view showing a method for manufacturing the lithium-ion battery protection circuit according to Embodiment 1 of the present invention.

FIG. 5 is a front view of the same.

FIG. 6 is a perspective view of a lithium-ion battery protection circuit according to Embodiment 2 of the present invention.

FIG. 7 is a perspective view of a conventional lithium ion battery protection circuit.

FIG. 8 is a plan view of a conventional lithium ion battery protection circuit.

FIG. 9 is a front view showing a connection state when a conventional lithium ion battery protection circuit is incorporated in a device.

[Explanation of symbols]

 Reference Signs List 51 resin substrate 52 cathode terminal 53 anode terminal 54 electronic component 55 electronic component 56 electronic component 57 electronic component 58 electronic component 59 waterproof resin

Claims (9)

[Claims] 1. A resin substrate on which electronic components are mounted, terminals provided on both ends of the resin substrate on the electronic component mounting surface side,
A waterproof resin covering the entire surface of the electronic component mounting surface other than the terminals of the resin substrate, wherein the waterproof resin is the same as the resin constituting the resin substrate or a resin having a higher hardness than the resin. Battery protection circuit. 2. The lithium ion battery protection circuit according to claim 1, wherein the width of the terminal is substantially the same as the width of the resin substrate. 3. The lithium ion battery protection circuit according to claim 1, wherein the thickness of the terminal is substantially equal to the thickness of the waterproof resin. 4. The lithium-ion battery protection circuit according to claim 1, wherein a ferrite powder is mixed in the waterproof resin. 5. The lithium-ion battery protection circuit according to claim 1, wherein the height of the waterproof resin is lower than that of the terminal. 6. The lithium-ion battery protection circuit according to claim 1, wherein a filler is mixed in the waterproof resin. 7. The lithium ion battery protection circuit according to claim 1, wherein a contact surface of the resin substrate with the waterproof resin is roughened. 8. Lithium which covers a mounting surface of the electronic component on a resin substrate having terminals at both ends and an electronic component mounted between the terminals, with a resin having the same hardness or higher than the resin constituting the resin substrate. A method for manufacturing an ion battery protection circuit. 9. The method for manufacturing a lithium ion battery protection circuit according to claim 8, wherein the electronic components are covered with a waterproof resin by utilizing the terminals on both sides as a part of a mold.