CN102339967A - Prismatic cell and cell bus sheet of prismatic cell - Google Patents

Abstract

The invention provides a battery cell busbar of a square storage battery pack and the square battery pack. The busbar is a long metal conductive sheet, and two opposite sides respectively have conductive sides bent at right angles to the same direction. Each battery cell of a square battery pack has a right-angled busbar on both sides, and the positive plate of the battery cell and the powder-free mesh of the negative plate are respectively welded to the bent conductive edge of the busbar on the corresponding side. The connector on the board is welded into the U-shaped inner groove formed by the bending conductive edge and the conductive sheet. The invention makes better use of the flexibility of the battery matrix material, improves the confluence effect and reduces the internal resistance. On the other hand, the conductive effect of the battery is further improved, thereby improving the high-rate discharge performance of the square battery pack.

Description

Cell busbars for square battery packs and square battery packs

technical field

The invention relates to an internal part of a storage battery and the storage battery, in particular to a cell busbar of a square storage battery pack and the square storage battery pack.

Background technique

At present, there are mostly two ways to connect the pole pieces of the battery cells in the power battery pack with a square structure. One is that the pole piece structure includes tabs with round holes, and each pole tab is welded after being tightened by the pole. At the terminal of the battery electrode, this connection method mainly has the problems of large internal resistance and poor conductivity of the pole piece.

The other is the end face welding structure. Firstly, a plurality of positive and negative plates are laminated through the diaphragm, so that the side edges of the opposite sides of the positive and negative plates are respectively protruded as leads, so that the collector plate is in a vertical posture. Close to the protruding lead part, and then weld them together by means of resistance welding to form an end face weld. The confluence effect of the end face welding structure is relatively better than that of the previous tab structure, but the production cost is high and the processing is difficult.

Contents of the invention

The invention aims to provide a battery cell busbar of a square storage battery pack with large diversion area, good diversion effect and low processing difficulty, and a square battery pack using the busbar.

The present invention realizes by following scheme:

The cell busbar of the square battery pack is a long metal conductive sheet, and the two opposite sides respectively have conductive sides bent in the same direction.

For the convenience of processing, the bending angle of the bent conductive edge is preferably 90°, that is, right-angled edge.

The square battery pack includes a rectangular shell, a sealing cover, a battery cell built in the shell, and a bus bar. A separator is used to separate two adjacent cells and form separate cell chambers. Electrolyte is injected into the cell chamber. The battery cells at both ends are separated from the shell by separators. The battery cells are composed of positive plates, diaphragms, and negative plates alternately stacked with each other. The powder-free grid positions of the positive plate and the negative plate are respectively welded to the bent conductive side of the bus plate on the corresponding side, and the connector on the separator is welded into the U-shaped inner groove formed by the bent conductive side and the conductive plate.

Compared with the cell current collection technology of the existing square battery pack, the bus bar of the present invention, on the one hand, after the cells are stacked and formed, the positive plate or the negative plate of the cell is welded to the powder-free network position respectively. The bending edge of the bus plate on the corresponding side realizes the confluence of the plates, which makes better use of the flexibility of the battery base material (Ni-MH battery such as nickel foam or punched steel strip), improves the confluence effect and reduces the internal resistance. On the other hand, after the battery core and the bus bar are welded, put them into the shell, and then weld two or more connectors passing through the battery core partition plate to the battery through resistance welding, laser welding or argon arc welding. The U-shaped inner groove of the converging connection piece of the cell realizes multi-point power supply between two adjacent cells, further improves the conductive effect of the battery, and thus improves the high-rate discharge performance of the square battery pack.

Description of drawings

Figure 1: Schematic diagram of the busbar in Example 1

Figure 2: Schematic diagram of square battery pack in Embodiment 2

Figure 3: Schematic diagram of a single battery cell in a square battery pack in Example 2

Detailed ways

Example 1

A cell busbar of a square battery pack, the schematic diagram of which is shown in Figure 1. It is a long metal conductive sheet 1 , two opposite sides respectively have conductive sides 2 bent in the same direction at right angles, and the two conductive sides and the conductive sheet 1 encircle to form a U-shaped inner groove 3 .

Example 2

A square storage battery pack, the schematic diagram of which is shown in Figure 2. It includes a rectangular shell 4, a sealing cover 5, six single cells 6 built in the shell, and a bus bar 1. A partition 7 is used to separate two adjacent cells and form separate cell chambers. Electrolyte is injected into the room, and the batteries located at both ends are separated from the shell by separators. The batteries are composed of positive plates, diaphragms, and negative plates alternately stacked with each other. There are two connectors 8 and 9 on each separator 7 (Fig. 2 only shows the structural representation of a single battery cell and accessories in the battery pack, and the structures of the other five battery cells and accessories are the same); the structural diagram of each single battery cell 6 is shown in Figure 3. There is a piece of busbar 1 adopting the structure of Example 1 on each side of the battery, the positive plate of the battery cell is welded to the two right-angled conductive sides 2 of the busbar on one side, and the negative plate of the battery cell is powder-free The net position is welded to the two right-angled bent conductive sides of the busbar on the other side, and the connectors 8 and 9 on the separator are welded into the U-shaped inner groove 3 formed by the bent conductive side and the conductive strip (Fig. 3 Only shows the welding condition of the bus bar on one side of a single cell, and the welding on the other side opposite to it is the same).

Claims (3)

1. A cell busbar of a square storage battery pack, characterized in that: a strip metal conductive sheet, two opposite sides respectively have conductive edges bent in the same direction. 2 . The cell busbar of a square battery pack according to claim 1 , wherein the bending angle of the bent conductive edge is preferably 90°. 3 . 3. A square storage battery pack, comprising a rectangular housing, a sealing cover, a battery cell built in the housing, and a busbar. A partition is used to separate two adjacent battery cells and form a separate battery cell room. In the battery cell room The electrolyte is injected, and the battery cells at both ends are separated from the shell by separators. The battery cells are composed of positive plates, diaphragms, and negative plates alternately stacked. The busbar described in 1 or 2 is required, the powder-free grid positions of the positive plate and the negative plate of the battery are respectively welded to the bent conductive side of the busbar on the corresponding side, and the connector on the separator is welded to the bent conductive side. In the U-shaped inner groove formed by the side and the conductive sheet.

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