Battery pack with short-circuit protection function

Abstract

The invention discloses a battery pack with a short-circuit protection function. The battery pack comprises batteries and connection protecting sheets; the number of the batteries is at least two, and the batteries are in serial connection or in parallel connection through the connection protecting sheets; each battery is provided with a positive terminal and a negative terminal; each connection protecting sheet is provided with at least two lugs; the connection protecting sheet is connected with the positive terminal and the negative terminal through the lugs; and the connection protecting sheet is slotted between the lugs to form a narrowed conductive connection part capable of fusing in short circuit of the batteries. According to the battery pack, the connection protecting sheets are slotted in the current path in the section direction for being narrowed and shrunk; the slotted, narrowed and shrunk connection protecting sheets reduce the section area of the current path, namely, the overcurrent capability of the connection protecting sheets is reduced, however, the current-passing capability in normal use can be ensured, and meanwhile, the connection protecting sheet can be fused in time in encountering large current for realizing overcurrent and protection. The battery pack is simple in manufacturing process, and capable of improving the current-passing capability among the batteries, and the battery can be switched off in encountering higher current so as to avoid chain reactions.

Description

technical field [0001] The invention is used in the technical field of automobile power batteries, and in particular relates to a battery pack with a short-circuit protection function. Background technique [0002] In the prior art, batteries are grouped into battery packs. In order to obtain more energy, multiple batteries are often combined, involving series, parallel or mixed connection of batteries. A large number of batteries are connected together and need to be electrically connected. [0003] Traditional technologies include: In order to obtain better overcurrent or output energy or power, the electrical connection between batteries often uses metal materials such as copper or copper with tin or nickel with better conductivity. Certain potential safety hazards, once the battery short-circuits, the battery current is too large, and there are certain differences between the batteries. If the battery exceeds the capacity that the battery can bear and continues to short-...

AI Technical Summary

Problems solved by technology

[0007] 1. The resistance of the fuse is relatively high. The internal resistance of the battery is about 20mΩ, but the resistance of the fuse is 7mΩ, accounting for 35% of the battery. Each battery needs to add 1 or 2 such fuses, which seriously affects the power of the battery. Energy play also has a certain influence

[0008] 2. The fuse is a composite material composed of a variety of metals and other materials. It can be used as a component in the battery pack, but it also needs to be connected to other metal conductors. The material used as the connector is generally metal copper or copper tin-plated, etc. For a single metal material, it is extremely technically difficult and requires a lot of investment in equipment to effectively connect the two materials, the fuse and the metal conductor, and it is not something that ordinary resistance welding or laser welding can achieve. Sex is also a problem

[0009] 3. The cost of fuses is not low, especially in the field of automotive power batteries, which require a relatively large current environment. The current capacity of the total fuse needs to be relatively high, and the cost of the corresponding fuse is also greatly increased.

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