Safety structure of a power battery pack

Abstract

The invention discloses a security structure of a power battery pack. The power battery pack comprises N sets of batteries, each set comprising N*P single batteries connected in parallel and arranged in matrix. Adjacent two battery sets are connected in series. An enhanced circuit board is connected on a positive electrode or a negative electrode of each set of batteries. The enhanced circuit board comprises a conductive main board and an insulation material covered on front and back sides of the conductive main board and integrally shaped with the conductive main board. Compared with prior arts, with the enhanced circuit board, single batteries can be balanced, and a consistency is good. Also, if a single battery in a battery pack has a short-circuit phenomenon, an electrical connection arm arranged in the enhanced circuit board is fused, such that the possibly over-current single battery in the single battery matrix is isolated from the battery matrix. Therefore, fault single battery spreading is prevented, and battery pack safety is protected.

Description

【Technical field】 [0001] The invention relates to the technical field of safety of power battery packs, in particular to a safety structure of power battery packs suitable for electric vehicles and electric buses. 【Background technique】 [0002] As a new energy source for automobiles, lithium iron phosphate batteries have been widely used. However, electric vehicles and electric buses have relatively high requirements on battery voltage and current. Therefore, the power boxes of electric vehicles and electric buses are equipped with battery packs composed of several lithium iron phosphate batteries connected in series and in parallel. [0003] The battery pack has a scheme of parallel connection first and then series connection, and there is also a scheme of first series connection and then parallel connection. Using the scheme of paralleling first and then series, the single cells in parallel are balanced with each other, and the consistency is good. However, if a single ...

AI Technical Summary

Problems solved by technology

However, it is difficult to balance the battery pack in the first series and then parallel scheme

Adding a parallel branch in the same row of single cells can play a balanced role to a certain extent, but this brings another problem, that is, when a short circuit occurs inside a single cell, the short circuit between the single cell and the single cell All the single batteries connected in parallel are short-circuited externally, and the energy of all the batteries connected in parallel is quickly released in the faulty single battery, and the temperature of the faulty battery rises sharply, which may cause the faulty battery to explode, and finally destroy the normal operation of the entire battery pack. Work leaves a huge safety hazard

[0004] In addition, electric vehicles and electric buses may experience violent bumps during driving, and the battery packs installed in the existing power boxes that are composed of several lithium iron phosphate batteries in series and parallel are usually not designed for shock resistance

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