Battery pack

Abstract

The utility model provides a battery pack which is provided with a battery (1), a circuit board (5) and an end part shell (6), wherein the circuit board (5) is provided with a charge and discharge protecting circuit, and is arranged on the end surface (3) of the battery; the end part shell (6) is provided with an external connecting terminal (7); the circuit board (5) is contained and arranged in the inside of the end part shell (6), both ends of the end part shell (6) are respectively combined with a head part (12a), and penetrated screws (12) are fixedly screwed in both ends of the end surface (3) of the battery (1) so as to fix the end part shell (6). The utility model realizes the battery pack which has the advantages of compact structure, small connecting resistance, high reliability and high productive efficiency.

Description

technical field [0001] The present invention relates to a battery pack formed by arranging a circuit board with a charge-discharge protection circuit at one end of a battery, and integrating an end case housing the circuit board with the battery. Background technique [0002] A battery pack that integrates a battery and a circuit board with a charge-discharge protection circuit requires a compact structure, low connection resistance, high reliability of the connection, and high productivity in the manufacturing process. [0003] A conventional battery pack adopts a structure in which a battery, a protective element, or a circuit board are accommodated in a case. As a specific example, it is known that the battery is accommodated in a case with a terminal window, a protective element or a circuit board is arranged in the space provided between the battery and the case, and a lead plate connecting the battery and the circuit board is arranged opposite to the terminal window. ...

AI Technical Summary

Problems solved by technology

[0007] However, in the structure of Patent Document 1, since a space for arranging the protective element and the circuit board is provided between the case and the battery, the outer shape of the case becomes large, and there is a possibility of failure due to movement or vibration of the circuit board or the protective element. It is possible, but it is difficult to fix the circuit board or protective element to the battery or case so that it cannot ensure high reliability, and since it is connected with a lead plate, there is a large connection resistance The problem

[0008] However, in Patent Document 2, although the protective element is fixedly installed on the battery through the terminal bracket, the lead plate is welded on the combination of the battery and the bracket, and is stored in the case to form a battery pack. Therefore, not only the external dimensions become larger, but also The connection resistance is large, and there are many assembly processes, making it difficult to ensure high production efficiency.

[0009] In addition, although Patent Document 3 fixes the circuit board to the sealing plate of the battery by using a special sealing plate having a connection protrusion, the connection resistance can be reduced by the connection structure without using the lead plate, and the structure of the assembly process can be reduced. , but due to the structure of the battery pack that accommodates these circuit boards and batteries in the case, there is a problem that the external dimensions become correspondingly larger

[0010] In addition, Patent Document 4 fixes the protective element and the output terminal to the resin molded part by insert molding the battery, the protective element, and the output terminal, so that the number of parts can be reduced and the structure can be compactly configured, but the insert molding requires equipment cost. And it is difficult to ensure high dimensional accuracy or production efficiency

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