Energy storage device

Abstract

The invention discloses an energy storage device. The energy storage device comprises an energy conversion element, a shell and a terminal; the energy conversion element is provided with at least oneelectric connection part arranged on a surface of the energy conversion element; the shell is made of an insulating material, a cavity is formed in the shell, the shell comprises a first half shell and a second half shell which are connected together in a sealed mode, and at least one of the first half shell and the second half shell comprises a concave structure and an edge part which is formed by extending outwards around the edge of the concave structure; a windowing structure is arranged on the concave structure; and the terminal is a sheet structure, the edge of at least one surface of the terminal is connected with the windowing structure in a sealed mode, and an electric connecting part makes contact with an inner surface of the terminal. One technical effect of the invention is characterized in that the energy conversion element is electrically connected with an external portion through the terminal, the terminal and the shell form sealed connection, and when pressure in the shell is increased, the pressure can be released at a sealed connection part of the two; and moreover, the shell made of plastic is adopted so that safety and explosion-proof performance are superior tothat of a steel shell.

Description

technical field [0001] The present invention relates to the technical field of energy storage devices, and more specifically, the present invention relates to an energy storage device. Background technique [0002] The energy storage device includes, for example, a battery, a capacitor, and the like. Usually, a battery needs to be installed in an electronic product, and the battery is used for power supply, so as to realize the normal use of the electronic device. Batteries used in electronic products can be, for example, steel case batteries or pouch batteries, etc., and there are various types. [0003] Existing pouch batteries usually use aluminum-plastic film with better waterproof as the casing. Specifically, a pouch battery usually includes a winding core and two half-cases snapped together, and the winding core is assembled into a space surrounded by the two half-cases. The two tabs of the winding core protrude from the edges of the two half-shells for electrical c...

AI Technical Summary

Problems solved by technology

In general, the bonded edges protrude outwards, which makes the energy storage device large in size, which is not conducive to assembly on other equipment

The aluminum-plastic film usually has a three-layer structure. It is necessary to make separate materials and then press and bond the three layers together. The process is complicated. At the same time, if all metal shells are used, the weight of the battery is relatively large. In the field of wearable batteries, the battery Lightweight requirements are put forward, which affects the comfort of the product to users

In addition, the safety performance of the existing steel-cased batteries has always been difficult to solve, especially when the battery is used in a limited confined space, and the steel case of the battery cannot be opened, which may easily cause a safety explosion accident, and metal-cased batteries are usually formed by connecting metal to the terminals. , or two metal casing halves are buckled to form a button battery. The distance between the positive and negative electrodes is relatively close. During the automatic production process, it is easy to cause a short circuit due to the mutual contact of the batteries, which affects the performance of the battery. In the salt spray environment, it is also very It is easy to cause the positive and negative electrodes of the battery to be bridged and fail because the distance between the positive and negative electrodes is too small

[0004] In addition, in the prior art, due to the flaws in the design of the battery structure, such as the high strength of the steel case, it is not easy to deform, and it is easy to cause internal pressure to accumulate. When it is used abnormally or overcharged, it is likely to cause the battery to catch fire, seriously It will cause battery explosion accident

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