Battery cover plate of external double-fuse protection device

Abstract

The invention discloses a battery cover plate of an external double-fuse protection device. The battery cover plate comprises a battery cover plate, a positive terminal, a first positive electrode connecting block, a second positive electrode connecting block, a negative terminal and a negative electrode connecting block, wherein the positive terminal, a positive electrode insulating seal ring and a positive electrode insulating pad are fixed on the battery cover plate in an insulating manner by being riveted and combined with the first positive electrode connecting block, the second positive electrode connecting block is fixed on the battery cover plate in a welding manner, the first positive electrode connecting block and the second positive electrode connecting block are electrically connected via a fuse, a pressure bursting device sinking downwards is arranged on a cover plate right below the fuse, and a sharp bursting cutter body is fixed at the upper end of the pressure bursting device. The battery cover plate has the beneficial effects that: the fuse and the pressure bursting device are matched in use, the overcurrent and overvoltage protection double-fuse is achieved, and if one single battery is abnormal, the charge-discharge work of other batteries in a battery pack is not affected.

Description

technical field [0001] The invention relates to a rechargeable battery, in particular to a battery explosion-proof cover assembly with external battery internal pressure limiting and current limiting double insurance protection functions. Background technique [0002] At present, the rechargeable batteries that are being mass-produced and used in equipment on the market, especially the power-type prismatic batteries or energy-storage prismatic batteries in the new energy industry, can also be large-scale cylindrical batteries. There are still some limitations in the safety performance design of their structures. Insufficient, and some inconvenient places when combining series and parallel large-capacity battery packs; [0003] For the rechargeable battery with active short-circuit design of flip plate on the market, when the battery is abnormal, the electrolyte in the container vaporizes, generating high-pressure gas, which makes the internal pressure of the battery containe...

AI Technical Summary

Problems solved by technology

[0004] First, the explosion-proof cover plate with active short-circuit protection function of the reversing plate can use the abnormal pressure in the battery container to short-circuit the reversing plate before the explosion-proof plate bursts, forming a huge short-circuit current, and the fuse is built into the battery. The soft connecting piece inside the container realizes the function of disconnecting the charging and discharging of the abnormal battery; however, there are still some problems in this method, such as using the soft connecting piece inside the battery container as a short circuit protection body, or installing a professional fuse inside the battery container body, when it is short-circuited and fused or passes through a large charge and discharge current, high temperature will be generated on the flexible connection piece, and high-temperature metal slag may be generated when it is fused. This high temperature and high-temperature metal slag will definitely cause the temperature inside the battery container to rise. , it is possible to accelerate the gasification of highly active electrolytes, resulting in unpredictable risks; in addition, when there are many such batteries to form a large-capacity parallel battery pack application, one of the batteries is abnormal, after the active short-circuit action of the flip plate, it will not The soft connection pieces inside the container of all single batteries in the parallel circuit will be fused at high temperature due to the high current; but in fact, there is only one abnormal battery that is really problematic, and the other fused batteries in parallel are no problem Yes, because after the soft connection piece inside the battery container is fused, all batteries will not be able to recover and can only be completely scrapped, which will cause a great waste of resources

[0005] Second, this design of short-circuiting the flippers by increasing the internal pressure is not suitable for high-capacity battery packs that are connected in series and then in parallel, because when the single cells are connected in series first, one battery in a string will appear The problem is that after the battery is short-circuited by the flipping action and continues to be bridged, another one or more batteries connected in series will share the voltage of the whole string of batteries and become a high-voltage charge-discharge state. This high-voltage charge-discharge is harmful to the battery It is easy to cause these high-voltage batteries to heat rapidly and cause sequential damage; because the rechargeable batteries that are being used in large quantities in our industry are characterized by not being able to withstand high voltage, but they can withstand high current

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