JPH04101373U - battery pack - Google Patents

Abstract

(57) [Summary] [Purpose] To miniaturize and increase the capacity of a battery pack in which a printed circuit board equipped with an overcurrent or overheat protection element and electronic components is housed in a case along with batteries. [Structure] A battery group consisting of a plurality of prismatic batteries, an overcurrent or overheat protection element, and a flexible printed circuit board with electronic components mounted are housed in a case, and the protection element is placed between adjacent prismatic batteries. By inserting the electronic component mounted on the flexible printed circuit board into the space between the batteries formed by inserting the protective element,
Effectively utilize the space inside the battery pack.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention houses the prismatic battery, overcurrent or overheating protection element, and circuit board in a case. The present invention relates to a battery pack made of.

0002

[Conventional technology]

A battery pack that is made up of multiple batteries stored in a case may be subject to large currents or When the battery generates abnormal heat, it is necessary to cut off the current flowing to the battery or keep the current low. Thermal fuses and Overheat protection elements such as thermostats and overcurrents such as current fuses and breakers It is common practice to connect a protection element in series with the battery and store it together with the battery in the case. be exposed. In addition, in recent years, multiple charging terminals have been installed, and various switching elements and The printed circuit board with elements such as diodes installed is stored inside the battery pack case. This has also started to be done.

0003 On the other hand, as devices that use batteries become smaller, there is a demand for smaller and higher capacity battery packs. Compared to conventional cylindrical batteries, the volume of battery packs has been reduced compared to conventional cylindrical batteries. Battery packs using prismatic batteries, which are highly efficient, can be made smaller and have higher capacity, are attracting attention. It is.

0004 However, battery packs that house prismatic batteries in a case are different from conventional cylindrical batteries. There is no extra space inside the battery compared to the battery pack stored in the case. Therefore, when a printed circuit board with an element attached is inserted into the case, the thickness of the element will be As the thickness of battery packs increases, it becomes difficult to make battery packs sufficiently smaller and thinner. I couldn't do it.

[0005]

[Problem that the idea aims to solve]

This invention uses a printed circuit board equipped with overcurrent or overheating protection elements and electronic components. Attempts to miniaturize and increase capacity of battery packs housed in a case together with batteries It is something.

[0006]

[Means to solve the problem]

The battery pack of this invention consists of a battery group consisting of multiple prismatic batteries and a A protective element and a flexible printed circuit board with electronic components are housed in a case. The protection element is inserted between adjacent prismatic batteries, and the protection element is inserted between the cells. The space between the batteries formed by the insertion is filled with the flexible printed circuit board. It is characterized by the arrangement of electronic components.

[0007]

[Effect]

Using prismatic batteries as batteries stored in a battery pack makes it easier to use conventional cylindrical batteries. This frees up space inside the case, without creating excess space between the batteries. It can be used effectively.

[0008] Also, if the printed circuit board is made of a flexible printed circuit board, the board may be bent. As a result, the space formed between the batteries with overcurrent or overheating protection elements inserted, It is now possible to easily insert electronic components mounted on the board, and it is possible to easily insert electronic components mounted on the board from the battery group. It is possible to prevent attached electronic components from protruding.

[0009] Therefore, with the above configuration, the battery pack can be made thinner and smaller, and the battery pack can be made thinner and smaller. The capacity per volume of the pond pack can also be increased.

0010

【Example】

An embodiment of the present invention will be shown and described below.

[0011] Figure 1 is an exploded perspective view of the battery pack of the present invention, and Figure 2 is a flexible Lurin in the battery group. Figure 3 is a perspective view showing the state before mounting the flexible printed circuit board on the battery group. FIG. 4 is a perspective view of the flexible printed circuit board showing the mounted state.

0012 In the figure, 1 is a square battery whose side circumferential surface is covered with a heat shrink tube, and adjacent batteries The electrode terminals exposed on the end face of the battery are arranged side by side so that the terminals have different polarities, and the battery group is constructed. has been completed. A breaker 2 is arranged between the cells of this square battery 1, and its terminal 3 , 3 are spot welded to the electrode terminals of adjacent batteries, and all of the batteries constituting the battery group are The batteries 1 are connected in series by lead plates 4.

[0013] 5 is a flexible printed circuit board with a field effect transistor on one end of its surface. consisting of a star (FET) 6, 6, a diode 7, 7, a thermistor 8, and a resistor 9, 9. The electronic component (surface mount component) is located near the other end, and the charging terminal 10 of the battery pack is located near the other end. It is attached by soldering. Then, the board 5 is spaced apart from the charging terminal 10. A pair of discharge terminals 11 are similarly installed inside. The substrate also includes a substrate. Connecting parts 12, 12 with the battery group are formed so as to protrude from the connecting part 12. A metal plate 14 is soldered to bridge the notch 13 provided at the tip of the board 5 to prevent damage to the board 5. After bending wire parts A and B, attach this metal plate 14 to the electrode end of battery 1, which will become the terminal of the battery group. By spot welding the battery group and the flexible printed circuit board 5 to the connected.

[0014] When connecting this flexible printed circuit board 5 and the battery group, the electronic part of the circuit board 5 is Bend the area near the part where the product is attached in the direction of the arrow in Figure 3, and insert the breaker 2. The electronic component is inserted into the space 15 formed between the batteries 1 and 1 by this process. Next Then, connect these battery groups, breaker 2 and printed circuit board 5 to the upper case 16 and lower case. It is housed in a battery case consisting of a battery case 17 and attached to the flexible printed circuit board 5. The charging terminal 10 is locked to the upright piece 18 formed on the lower case 17, and the discharging terminal 11 is attached to the lower case. The battery pack of the present invention is constructed by exposing the battery pack through the opening 19 provided at the bottom of the base 17. .

[0015] As shown in Figure 1, the battery pack constructed in this way has excess space inside the battery. It can be made thinner and more compact without any problems, and has a large capacity per volume. This makes it possible to achieve high capacity.

[0016]

[Effect of the idea]

The battery pack of the present invention uses a battery group consisting of prismatic batteries, and uses overcurrent and overheat protection. Flexible printing is applied to the space formed between the cells of prismatic batteries with protective elements inserted. Since the electronic components mounted on the board are inserted, there is no unnecessary surplus inside the battery pack. There is no space required, and battery packs can be made smaller and have higher capacity. Ru.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a battery pack of the present invention.

FIG. 2 is a perspective view showing a state before a flexible lurinted board is attached to a battery group.

FIG. 3 is a perspective view showing a state in which a flexible printed circuit board is attached to a battery group.

FIG. 4 is a perspective view of a flexible printed circuit board.

[Explanation of symbols]

1 battery 2 Breaker (overcurrent or overheat protection element protection element) 5 Flexible printed circuit board 6 FET (electronic parts) 7 Diode (electronic component) 8 Thermistor (electronic component) 9 Resistance (electronic parts) 15 Space 16 Upper case 17 Lower case

Claims (1)

[Scope of utility model registration request] Claim 1: A battery group consisting of a plurality of prismatic batteries, an overcurrent or overheating protection element, and a flexible printed circuit board on which electronic components are mounted are housed in a case, and the protection element protects the adjacent prismatic batteries. A battery pack characterized in that an electronic component mounted on the flexible printed circuit board is inserted into a space between the batteries formed by the insertion of the protective element.