CN102447090B - Assembled battery - Google Patents

Abstract

The invention provides an assembled battery, which includes a wound electric core, a casing, a cap, a positive cap and a negative cap, and the positive cap is electrically connected to the cap. The positive cap includes an insulating cap and a positive metal cap, and the external structure of the positive cap is suitable for battery packs with various assembly methods. The negative electrode cap is electrically connected to the shell by welding, and the negative electrode cap is made of a metal material that is not easy to rust, which can ensure the stability of the electrical connection during use.

Description

Assembled battery

technical field

The invention relates to a battery.

Background technique

The application of batteries is becoming more and more extensive, and the requirements of modern society on the performance, capacity and other indicators of batteries are also getting higher and higher. For example, electric bicycles and electric vehicles require large-capacity battery packs, which consist of a large number of batteries connected in series or in parallel.

The battery shell of the existing cylindrical battery is generally the negative pole, and the battery cap is usually the positive pole. Because the contact area of the positive electrode cap of the cylindrical battery is small for the electrical connection of the positive electrode, welding can only be used when connecting the cylindrical battery into a battery pack, which limits the assembly method of the cylindrical battery to form a battery pack to a certain extent. When a battery pack electrically connected by welding fails, a single battery cannot be easily detected and replaced, and the entire battery pack can only be scrapped, thus causing huge waste.

The caps of existing secondary lithium-ion cylindrical batteries are generally designed with explosion-proof valve devices to prevent the cap from bursting out when the battery fails, but when the explosion-proof valve fails, the cap may still burst out after the battery fails, causing The electrolyte leaks, which affects other normal batteries.

The shell of the secondary lithium-ion cylindrical battery is generally nickel-plated steel on the outer layer. The coating is easily worn during production and use, resulting in rust, which eventually leads to an increase in the resistance of the electrical connection between the battery pack and the positive and negative electrodes of the battery. If it cannot be turned on, the current output performance of the battery is reduced or the battery cannot output electric energy, which affects the normal use of the battery pack, and sometimes even causes a relatively large safety accident.

Contents of the invention

The purpose of the present invention is to provide an assembled battery that is easy to disassemble and replace in the battery pack, has high safety performance, and ensures that the battery maintains low internal resistance during use.

In order to achieve the above object, the present invention provides an assembled battery, which includes a wound battery, a casing, and a cap. The assembled battery also includes a positive electrode cap, which is located outside the cap and electrically connected to the cap. The positive cap includes an insulating cap and a positive metal outer cap.

In the assembled battery provided by the present invention, the positive electrode cap and the cover cap are electrically connected by welding, and an insulating cap is arranged between the positive electrode metal outer cap of the positive electrode cap and the battery shell to keep the insulation between the positive electrode cap and the shell.

In order to achieve the above object, the present invention provides an assembled battery, which further includes a negative electrode cap electrically connected to the battery case.

The entire outer surface of the positive metal outer cap of the combined battery provided by the present invention can be used for external electrical connection to be assembled into a battery pack, so it can be used in battery packs with various electrical connection methods, for example, by inserting into the battery pack frame In the conductive hole, the outer periphery or bottom surface of the positive metal outer cap is electrically connected to the conductive hole to form a battery pack. The battery pack with this structure is easy to disassemble when it fails, and a single battery can be detected and replaced.

In the assembled battery provided by the present invention, the negative electrode cap and the battery shell are electrically connected by welding, the connection method is fastened and reliable, and the electrical connection part is not affected by the rust of the shell. The electrical connection of the battery pack is reliable, which improves the safety performance of the battery pack.

In the assembled battery provided by the invention, the negative electrode cap and the battery shell are electrically connected by welding, and the electrical connection part is not affected by the rust of the shell, which can ensure that the battery maintains low internal resistance during use, thus ensuring the normal use and safety of the battery .

Description of drawings

Fig. 1 is an exploded view of the assembled battery provided by the present invention.

Fig. 2 is a schematic structural view of the positive electrode cap of the combined battery of the present invention.

Fig. 3 is a half-sectional schematic diagram of the insulating cap of the combined battery of the present invention.

Fig. 4 is a schematic diagram of the structure of the negative electrode cap of the combined battery of the present invention.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

As shown in FIGS. 1 and 2 , an assembled battery 1 includes a battery 2 , a positive electrode cap 3 and a negative electrode cap 4 . The positive cap 3 is composed of an insulating cap 5 and a positive metal outer cap 6, and the negative cap 4 is a metal conductor.

The positive metal outer cap 6 and the block cap 7 are electrically connected by spot welding, the positive metal outer cap 6 is insulated from the shell 8 by an insulating cap 5, and there is a step 9 on the insulating cap 5, and the step 9 is used to ensure that the positive metal outer cap 6 is connected to the shell 8 insulation. The positive metal outer cap 6 is used to electrically connect the battery 1 to the positive electrode of the battery pack when the assembled battery 1 is assembled into a battery pack. The outer layer contact area of the positive metal outer cap 6 is large, and is suitable for the assembly of large-capacity battery packs in various assembly methods. For example, the positive metal outer cap 6 is inserted into the conductive hole of the battery pack frame, and the outer periphery or bottom surface of the positive metal outer cap 6 is electrically connected to the conductive hole to assemble the battery pack. The battery pack with this structure is easy to disassemble when failure occurs, and a single battery can be detected and replaced.

Wherein the through hole 10 of the positive metal outer cap 6 is used for exhaust.

As shown in FIG. 3 , the inner side of the insulating cap 5 has a step 11 snapped into the rolling groove of the shell 8 , and the step 11 is used for a stable assembly of the positive electrode cap 3 and the battery 2 . When the explosion-proof valve of the battery 2 fails and the battery 2 breaks down, the cap 7 will not explode due to the resistance of the step 11 of the insulating cap 5, thereby ensuring the stability and safety of the battery pack.

The positive metal outer cap 6 can be made of nickel-plated copper. The insulating cap 5 can adopt high temperature and high pressure resistant PTFE (polytetrafluoroethylene) material and other suitable polymer materials.

As shown in FIG. 4 , the negative electrode cap 4 of the assembled battery 1 is electrically connected to the battery casing 8 by spot welding. When the battery casing 8 is rusted, the spot welding electrical connection between the negative electrode cap 4 and the casing 8 can ensure a stable electrical connection and prevent the electrical connection resistance from increasing, thus ensuring the safety and performance of the battery pack.

The negative cap 4 can be made of nickel-plated copper.

The above descriptions are only examples of the present invention, and are not intended to limit the scope of the present invention. All equivalent changes or modifications made according to the structure, features and principles described in the scope of the patent application for the present invention shall be included in the patent of the present invention. within the scope of the application.

Claims (3)

1. an assembled battery, comprises winding battery core, shell, blocks a shot, it is characterized in that: described assembled battery also comprises positive electrode cap, positive electrode cap is positioned at block outside and is electrically connected with described block; Described positive electrode cap comprises insulator cap and the outer cap of cathode metal; There are the card rank be connected in shell slot rolling the inner side of described insulator cap; Described insulator cap is arranged the step by outer for cathode metal cap and casing insulation; The outer cap copper of outer nickel plating of described cathode metal becomes; Assembled battery also comprises negative pole cap, and negative pole cap is electrically connected with described shell.

2. assembled battery according to claim 1, described positive electrode cap and described casing insulation.

3. assembled battery according to claim 1, described negative pole cap is electric conductor.