CN203659970U - Battery module - Google Patents

Abstract

The utility model provides a battery module, which includes a battery unit with tabs and a connecting piece, the tabs of the battery unit are fixed on the connecting piece, and the feature is that several welding grooves are arranged on the connecting piece, and the welding The width of the groove is approximately equal to the thickness of the battery cell tab, the length of the welding slot is approximately equal to the width of the battery cell tab, and the battery cell tab extends into the welding slot and is directly welded on the slot wall of the welding slot. By adopting a connection method different from that of the prior art, the battery module has the ability to pass a large current, and at the same time reduces the resistance of the connection piece and reduces the heat generation.

Description

battery module

technical field

The utility model discloses a lithium ion battery module. the

Background technique

Soft-pack lithium batteries are usually connected in series by a combination of multiple cells, and each cell has a positive tab and a negative tab. When multiple cells are connected in series, the positive tabs of two adjacent cells, The negative tabs are connected in series in sequence. The positive pole tab and the negative pole tab of the existing soft-pack lithium battery are connected by a connecting piece. Specifically, a plurality of welding grooves are arranged on the connecting piece. After protruding from the groove, it is folded over and finally welded on the connecting piece. This connection method has the advantage of a stable connection, but it also brings other disadvantages. the

Since the lug is protruded from the welding groove and then folded on the connecting piece, the fixing process of the lug and the connecting piece includes turning operation and welding operation, and the assembly efficiency is low; and the existing welding groove is convenient for the lug to protrude from it. Considering that the size is generally large, this reduces the surface area of the connecting piece, limits the current passing capacity of the connecting piece, further makes the connecting piece generate a lot of heat, and easily causes thermal runaway. the

The patent with the application number CN201220464076.6 discloses a soft-packed lithium battery provided by the utility model, and discloses a connection sheet structure, on which a tab pad is provided, and the tab pad is opened There is a strip groove, the length of the strip groove matches the width of the positive and negative pole lugs. Although there is no mention of the problem of turning the tabs over, since the tab pads are set on the connecting piece, they must pass through the tabs. Only when it is folded can it be soldered to the tab pad. the

Utility model content

The purpose of the utility model is to overcome the shortcomings and deficiencies of the above-mentioned prior art, and provide a battery module, including a battery unit and a connecting piece, the tabs of the battery unit are fixed on the connecting piece, and several welding grooves are arranged on the connecting piece The width of the welding groove is approximately equal to the thickness of the battery cell tab, the length of the welding groove is approximately equal to the width of the battery cell tab, and the battery cell tab extends into the welding groove and is directly welded on the groove wall of the welding groove. the

The width of the welding groove is approximately equal to the thickness of the battery cell lug, and the length of the welding groove is approximately equal to the width of the battery cell lug, which ensures that the battery power lug can just be inserted into the welding groove, and the maximum surface area of the connecting piece is reserved to increase the flow of current. Ability; After the battery cell tabs are inserted into the welding groove, laser welding is used to weld the battery cell tabs to the groove wall of the welding groove, which not only ensures the stability of the connection, but also simplifies the assembly steps. the

The top of the tab of the battery cell does not exceed the height of the welding groove, and preferably, the top of the tab of the battery cell is flush with the welding groove. the

The uppermost part of the tab of the battery cell is set flush with the connecting piece, which is convenient for assembly, and can prevent contact with other components in the battery box and avoid short circuit. the

After using the technical solution of the utility model, the redesigned welding groove enables the connecting piece to have a large current passing capacity, and the tab is welded on the wall of the welding groove of the connecting piece, which ensures the stability of the connection and simplifies the assembly steps . the

Description of drawings

FIG. 1 is a schematic structural diagram of a battery module. the

Among them, 1. battery module, 2. welding groove. the

Detailed ways

As shown in Figure 1, the battery module provided by the utility model includes a battery unit and a connecting piece. The connecting piece is made of aluminum sheet. The width is approximately equal to the thickness of the battery cell tab, and the length of the welding groove is approximately equal to the width of the battery cell tab. After the battery cell tab is inserted into the welding slot, laser welding is used to weld the battery cell tab to the groove wall of the welding slot, and The top of the battery cell tab is flush with the solder groove. the

Claims (2)

1. a battery module, comprise battery unit and brace, the lug of described battery unit is fixed on brace, it is characterized in that: several welding grooves are set on described brace, the width of described welding groove approximates the thickness of battery unit lug, the length of welding groove approximates the width of battery unit lug, and described battery unit lug stretches into welding groove and is directly welded on the cell wall of welding groove.

2. battery module according to claim 1, is characterized in that: the top of described battery unit lug and welding groove maintain an equal level.

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