Method for manufacturing power storage laminated module

Abstract

Provided is a method for manufacturing a power storage stack module body, the method being capable of suppressing positional displacement without being affected by thermal expansion / contraction during thermal welding. In a method for manufacturing an electricity storage laminated module body, an electricity storage body is laminated while maintaining a state in which a voltage detection terminal is held by a holding plate, the voltage detection terminal is clamped by a clamping jig that suppresses movement in a direction perpendicular to the electricity storage body, and after the holding plate is pulled out from the voltage detection terminal, a case corresponding to the voltage detection terminal is inserted.

Description

Technical Field

[0001] This invention relates to a method for manufacturing an energy storage multilayer module. Background Technology

[0002] Patent document 1 describes the following: When inserting the resin component into the terminal of the energy storage module stack, a terminal alignment fixture is used to align the front end of the terminal with the hole position of the housing.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2024-57752 Summary of the Invention

[0004] In order to achieve its intended function, the energy storage module laminate is sealed around the entire perimeter through heat fusion and other means, and the housing is assembled after the heat fusion.

[0005] However, during thermal welding, the terminal spacing / angle changes due to the thermal expansion / contraction of the energy storage module stack, exceeding the allowable range of the clamping fixture, resulting in a mismatch between the clamping fixture and the terminal position on the energy storage module stack side.

[0006] In one embodiment of the method for manufacturing an energy storage stacked module, terminals are held by a retaining plate.

[0007] Invention Effects

[0008] According to the manufacturing method of the energy storage multilayer module disclosed herein, it is not affected by thermal expansion / contraction during thermal welding, and positional displacement can be suppressed. Attached Figure Description

[0009] Figure 1 This is a schematic diagram illustrating an example of a method for manufacturing an energy storage multilayer module according to Embodiment 1.

[0010] Figure 2 This is a schematic diagram illustrating an example of a method for manufacturing an energy storage multilayer module according to Embodiment 1.

[0011] Figure 3 This is a schematic diagram illustrating an example of a method for manufacturing an energy storage multilayer module according to Embodiment 1.

[0012] Figure 4 This is a cross-sectional view showing an example of the energy storage stacked module body according to Embodiment 1.

[0013] Figure 5 This is a schematic diagram illustrating an example of the energy storage stacked module body involved in Embodiment 1.

[0014] Figure 6 This is a perspective view showing an example of the retaining plate of the energy storage stacked module body according to Embodiment 1.

[0015] Figure 7 This is a top view showing an example of the energy storage stacked module body according to Embodiment 1.

[0016] Figure 8 This is a cross-sectional view showing an example of the retaining plate and clamping fixture of the energy storage stacked module body according to Embodiment 1. Detailed Implementation

[0017] Implementation Method 1

[0018] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Figure 1 , Figure 2 and Figure 3 This is a schematic diagram illustrating an example of a method for manufacturing an energy storage multilayer module according to Embodiment 1.

[0019] First, such as Figure 1 As shown in (a), a retaining plate 102-1 is held in the clamp assembly (Assy) 101. Figure 1 In example (a), the clamp assembly 101 has two pillars 111 and 112. Furthermore, the retaining plate 102-1 is held by holding the pillars 111 and 112.

[0020] Next, as Figure 1 As shown in (b), a stack 104-1 is placed on tray 103, and terminals 105-11 to 105-1n (n is any natural number) are clamped between the stack 104-1. The stack 104-1 is the energy storage element of the energy storage stack module. Furthermore, terminals 105-11 to 105-1n are voltage detection terminals.

[0021] Next, as Figure 1 As shown in (c), by overlapping the retaining plate 102-2 on the retaining plate 102-1, terminals 105-11 to 105-1n are held between the retaining plate 102-1 and the retaining plate 102-2.

[0022] Next, as Figure 1 As shown in (d), terminals 105-21 to 105-2n are clamped between the laminates 104-2. Furthermore, by overlapping a retaining plate 102-3 on a retaining plate 102-2, terminals 105-21 to 105-2n are held between retaining plates 102-2 and 102-3. Similarly, the process of clamping the terminals between the laminates and holding them between the retaining plates is repeated.

[0023] Next, thermal fusion is performed on the entire perimeter of the laminate 104-1 to 104-n.

[0024] Next, as Figure 2 As shown in (e), the clamping fixture 106 descends between the laminates 104-1 to 104-n and the retaining plates 102-1 to 102-n, and clamps the terminals 105-11 to 105-mn (m and n are arbitrary natural numbers).

[0025] Next, as Figure 2 As shown in (f), the clamp assembly (Assy) 101 retracts and detaches from the tray 103.

[0026] Next, as Figure 2 (g) and Figure 3 As shown, only the front ends of terminals 105-11 to 105-mn are partially inserted into housing 107.

[0027] Next, as Figure 2 As shown in (h), the clamping fixture 106 opens to expose the terminal and retracts upward.

[0028] Next, as Figure 2 As shown in (i), the housing 107 is fully inserted to complete the process.

[0029] The above processes are used to manufacture the energy storage laminated module. Figure 4 This is a cross-sectional view showing an example of the energy storage multilayer module body according to Embodiment 1. For example... Figure 4 As shown in (a), a terminal 105-11 is joined to the end of the current collector foil 104-3. The ends of the current collector foil are sometimes sealed by resin sheets 104-1 and 104-2. The terminal 105-11 is connected to the metal foil 108. Then, multiple cells 41 are stacked. Figure 4 In (b), the battery storage module 42 has battery cells 41-1 to 41-n (n is any natural number) stacked on top of each other. For example, the battery storage module 42 has 31 battery cells 41 stacked on top of each other. In addition, during the manufacturing process, terminals 105-1 to 105-n are each held by two of the holding plates 102-1 to 102-n, thereby maintaining the positions of terminals 105-1 to 105-n at a constant interval.

[0030] Next, the details of the retaining plate will be explained. Figure 5 This is a schematic diagram illustrating an example of the energy storage multilayer module according to Embodiment 1. Figure 5 In (a), the diagram obtained by enlarging the area B enclosed by the dashed line is... Figure 5 (b)

[0031] like Figure 5As shown in (b), terminal 105-11 is sandwiched between laminate 104-1 and laminate 104-2. Furthermore, terminal 105-12 is sandwiched between the layers within laminate 104-1. Based on the height difference between terminal 105-1 and terminal 105-2, retaining plate 102-1 and retaining plate 102-2 form a stepped shape with planar connections having a stepped difference.

[0032] This structure allows for the stacking of retaining plates during cell stacking, holding the terminals vertically until the housing assembly process, thus suppressing the vertical swinging of the terminal tips.

[0033] Figure 6 This is a perspective view showing an example of the retaining plate of the energy storage laminated module body according to Embodiment 1. Figure 6 As shown, the distance 61 between the end face of the battery cell stack and the shaft block of the retaining plate is preferably 30 mm or more. Furthermore, the edge 62 of the retaining plate is preferably 5 mm or less. Furthermore, the plate thickness 63 of the retaining plate is preferably 0.8 mm or less. Furthermore, the plate depth 64 of the retaining plate is preferably 2 mm or less.

[0034] Figure 7 This is a top view showing an example of the battery storage stacked module body according to Embodiment 1. The distance 72 between the battery cell stack end face and the heater 71 is preferably set to 50 mm.

[0035] By setting these dimensions, it is possible to avoid phenomena such as the retaining plate blocking heat from the heater, reducing the heat input, failing to meet the sealing requirements of the battery cell due to poor compatibility, and fixture deformation.

[0036] Figure 8 This is a cross-sectional view showing an example of the retaining plate and clamping fixture of the energy storage stacked module body according to Embodiment 1.

[0037] like Figure 8 As shown in (a), due to variations in cell thickness or changes in terminal position caused by cell stacking or thermal welding, housing insertion cannot be performed without the retaining plate 102. Furthermore, the retaining plate's clamping assembly 101 cannot be recovered unless it is disassembled before housing assembly. Therefore, as... Figure 8 As shown in (b), the clamping fixture 106 is lowered from the top of the workpiece, clamped using a component with a notch on one side, and the front end position of the terminal 105 is aligned along the notch to maintain it with high precision. This allows the retaining plate 102 to be released, enabling the assembly of the housing. Furthermore, after the housing is partially inserted, the clamping fixture 106 opens to the left and right to expose the terminal and retracts to the top.

[0038] Thus, according to the manufacturing method of the energy storage laminated module body according to Embodiment 1, by holding the terminals with a retaining plate, the positional displacement can be suppressed during thermal welding as it is not affected by thermal expansion / contraction, and the resin component (housing) can be properly inserted.

[0039] Furthermore, the present invention is not limited to the above-described embodiments and can be appropriately modified without departing from the spirit of the invention. For example, the number of laminates, terminals, and retaining plates can be arbitrarily set as needed.

[0040] Symbol Explanation

[0041] 102-Retaining plate, 103-Tray, 104-Layer, 105-Terminal, 106-Clamp, 107-Housing, 108-Metal foil, 111-Column.

Claims

1. A method of manufacturing an electricity storage stacked module body, characterized by: stacking electricity storage bodies while maintaining a state in which a holding plate holds a voltage detection terminal, holding the voltage detection terminal with a holding jig that suppresses movement in a direction perpendicular to the electricity storage bodies, after pulling out the holding plate from the voltage detection terminal, inserting a case corresponding to the voltage detection terminal.

2. The method of manufacturing an electricity storage stacked module body according to claim 1, characterized in that: the holding plate has a stepped shape, and electricity storage bodies are stacked while maintaining a state in which the holding plate holds a plurality of terminals at different heights.

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