Welding method

Abstract

The present invention provides a welding method that allows welding to be performed without the use of jigs. [Solution] The welding method according to the present disclosure is a welding method for welding a terminal of a battery cell to a busbar, comprising: a first step of overlapping the busbar onto a terminal that has been pre-processed with a recess; a second step of pressing the busbar into the position where the recess is located; and a third step of welding the terminal and the busbar. A crimping process is performed in the second step. This holds the busbar and the terminal in place. Therefore, an appropriate gap is ensured during welding, and an improvement in welding quality can be expected. In addition, since gap inspection is not required, processing costs can be reduced. Furthermore, since welding jig pressing is not required during welding, the welding area can be expanded.

Description

Technical Field

[0001] The present disclosure relates to a welding method.

Background Art

[0002] In the conventional welding method disclosed in Patent Document 1 below, when welding a bus bar to a terminal of a battery cell, a jig presses the bus bar. The bus bar is pressed against the terminal by the jig and laser welded.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In welding a bus bar and a terminal of a battery stack, if there is a gap between the bus bar and the terminal, welding defects occur. Therefore, welding is performed while applying pressure using a pressure jig. However, when applying pressure with the pressure jig, it is necessary to measure the dimension to check if there is a gap, and a space for pressing the pressure jig is required on the bus bar side.

[0005] The present disclosure has been made to solve the above problems. An object of the present disclosure is to provide a welding method capable of performing welding without using a jig.

Means for Solving the Problems

[0006] The welding method according to the present disclosure is a welding method for welding a terminal of a battery cell and a bus bar, and includes a first step of overlapping the bus bar on the terminal that has been previously recessed, a second step of pushing the bus bar into the position where the recess is arranged, and a third step of welding the terminal and the bus bar.

Effects of the Invention

[0007] According to this disclosure, welding can be performed without using jigs. [Brief explanation of the drawing]

[0008] [Figure 1] This figure shows a welding method according to Embodiment 1. [Figure 2] This figure shows the weldable range in the conventional method and the weldable range in this embodiment. [Figure 3] This is a side view showing a conventional welding method. [Figure 4] This is a flowchart showing the conventional welding process. [Figure 5] This is a flowchart showing the welding process in this embodiment. [Modes for carrying out the invention]

[0009] Embodiments will be described below with reference to the drawings. Common or corresponding elements in each drawing are denoted by the same reference numerals, and their descriptions are simplified or omitted. The configurations shown in the embodiments below are examples of the technical ideas related to this disclosure and can be combined with other known technologies, or multiple technical ideas described in this disclosure can be combined. Furthermore, it is possible to omit or modify parts of the configuration without departing from the gist of this disclosure.

[0010] Embodiment 1. Figure 1 is a diagram showing a welding method according to Embodiment 1. As shown in Figure 1, the upper surface of the terminal 1 of the battery cell is pre-formed with a recess 2 to create a hole. The welding method of this embodiment is a welding method for welding the terminal 1 and the busbar 3, and comprises a first step of overlapping the plate-shaped busbar 3 onto the terminal 1 which has the recess 2 pre-formed on its upper surface, a second step of pressing the busbar 3 into the position where the recess 2 is located, and a third step of welding the terminal 1 and the busbar 3 together.

[0011] The second step involves crimping. After setting the busbar 3 in the first step, crimping is performed from the top side of the busbar 3. Due to the crimping, a part of the busbar 3 plastically deforms and enters the recess 2. This holds the busbar 3 and the terminal 1. Therefore, an appropriate gap is secured during welding, and an improvement in welding quality can be expected. In addition, since gap inspection is unnecessary, processing costs can be reduced. Furthermore, since welding jig pressing is unnecessary during welding, the welding range is expanded. Figure 2 shows the weldable range in the conventional method and the weldable range in this embodiment. As shown in Figure 2, in the conventional method, welding jig pressing is necessary during welding, which narrows the weldable range. In contrast, with this embodiment, welding jig pressing is unnecessary during welding, so the weldable range is expanded.

[0012] Figure 3 is a side view showing a conventional welding method. As shown in Figure 3, in the conventional welding method, a gap inspection was required to measure the gap between the cell terminal and the busbar during welding. Figure 4 is a flowchart of the conventional welding process. As shown in Figure 4, in the conventional process, the busbar 3 is set (step S1) and pressed with a welding jig (step S2). Next, a gap inspection is performed (step S3), and the busbar 3 is welded (step S4).

[0013] Figure 5 is a flowchart of the welding process in this embodiment. As shown in Figure 5, in the process of this embodiment, the busbar 3 is set (step S11), and crimping is performed on the busbar 3 and the cell terminal 1 (step S12). Next, the busbar 3 is welded (step S13). [Explanation of Symbols]

[0014] 1 terminal, 2 recessed area, 3 pass bar

Claims

1. A welding method for welding the terminals of a battery cell to a busbar, The first step is to place the busbar on the terminal which has been pre-processed with a recess, A second step involves pressing the busbar into the position where the recessed part is located, A third step involves welding the terminal and the busbar, A welding method characterized by comprising the following:

2. The welding method according to claim 1, characterized in that a crimping process is performed in the second step.

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