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WO-2026091318-A1 - ADAPTER PIECE STRUCTURE, BATTERY CELL STRUCTURE AND ASSEMBLY PROCESS METHOD THEREFOR, AND LARGE-CAPACITY ENERGY STORAGE BATTERY

WO2026091318A1WO 2026091318 A1WO2026091318 A1WO 2026091318A1WO-2026091318-A1

Abstract

Provided in the present application are an adapter piece structure, a battery cell structure and an assembly process method therefor, and a large‑capacity energy storage battery. The adapter piece structure comprises a tab connection portion and a terminal post connection portion, wherein the tab connection portion is configured to connect to a tab of a battery cell; the terminal post connection portion is connected to the tab connection portion; and the terminal post connection portion has a first side, the first side has a cleaning area configured to be cleaned, the cleaning area comprises a welding area and an annular area surrounding the periphery of the welding area, and the welding area is configured such that the terminal post connection portion is fixed to a terminal post of a cover plate by means of welding in the welding area.

Inventors

  • LIU, JIANHUA
  • LIN, Chenneng
  • HE, WEI
  • CHEN, LIQUAN
  • SONG, Shuaishuai
  • YUAN, Dingding

Assignees

  • 惠州亿纬锂能股份有限公司
  • 湖北亿纬动力有限公司
  • 武汉亿纬储能有限公司

Dates

Publication Date
20260507
Application Date
20250117
Priority Date
20241028

Claims (16)

  1. An adapter plate structure (10) includes: The electrode connection part (1) is configured to be connected to the electrode (201) of the battery cell (20); The pole connection part (2) is connected to the pole tab connection part (1). The pole connection part (2) has a first side (21). The first side (21) has a cleaning area (211) that is configured to be cleaned. The cleaning area (211) includes a welding area (2111) and an annular area (2112) surrounding the welding area (2111). The welding area (2111) is configured to weld and fix the pole connection part (2) to the pole (301) of the cover plate (30).
  2. According to the adapter structure (10) of claim 1, the distance between the boundary of the welding area (2111) and the outer ring boundary of the annular area (2112) is L, wherein L≥1.0mm.
  3. According to the adapter structure (10) of claim 1, the area of the welding area (2111) is S1, the area of the cleaning area (211) is S2, and the surface area of the first side (21) is S3, wherein 0 < S1/S2 < 1; and/or 0 < S2/S3 ≤ 1.
  4. According to the adapter structure (10) of claim 1, the depth of the clean area (211) is H, wherein 0.5μm≤H≤1000μm.
  5. According to claim 1, the adapter structure (10) wherein the cleaning area (211) forms a groove (31) and a plurality of protrusions (32), wherein the plurality of grooves (31) and the plurality of protrusions (32) are arranged alternately.
  6. According to any one of claims 1 to 5, the adapter structure (10) wherein the electrode connection portion (1) comprises: The main body (11) is connected to the pole connecting part (2); Two connecting arms (12) are arranged opposite each other and spaced apart, and one end of each connecting arm (12) is connected to the main body (11); One of the two connecting arms (12) and/or the main body (11) is configured to be connected to one of the two tabs (201) that are aligned with the two adjacent cells (20), and the other of the two connecting arms (12) and/or the main body (11) is configured to be connected to the other of the two tabs (201) that are aligned with the two adjacent cells (20).
  7. According to the adapter structure (10) of claim 6, the area of the clean area (211) is S2; The main body (11) has a second side on the same side as the first side (21), the surface area of the second side is S4, the surface area of the first side (21) is S3, wherein S3+S4>S2.
  8. A cell structure (100) includes the adapter plate structure (10) as described in any one of claims 1 to 7.
  9. According to claim 8, the cell structure (100) further includes: Two battery cells (20) are arranged at intervals along the X direction. Each battery cell (20) has a first tab (202) and a second tab (203) arranged at intervals along the Y direction. The two first tabs (202) of the two battery cells (20) are positioned opposite each other, and the two second tabs (203) of the two battery cells (20) are positioned opposite each other. Two of the adapter plate structures (10) are connected to two first electrodes (202) with the electrode connecting part (1) of one of the two adapter plate structures (10) being connected to two second electrodes (203) with the electrode connecting part (1) of the other of the two adapter plate structures (10). The cover plate (30) is provided with two pole posts (301) arranged at intervals along the Y direction. The two pole posts (301) are welded and fixed to the corresponding pole post connecting parts (2) in the two welding areas (2111).
  10. According to the cell structure (100) of claim 9, wherein the tab connection portion (1) of one of the two adapter plate structures (10) is welded and fixed to the two first tabs (202) that are aligned; and/or, The tab connection part (1) of the other of the two adapter plate structures (10) is welded and fixed to the two second tabs (203) that are aligned.
  11. An assembly process method for a cell structure (100) as described in any one of claims 8 to 10, comprising the following steps; Two adapter plate structures (10) are obtained, each of the adapter plate structures (10) includes a pole post connection portion (2), the pole post connection portion (2) has a first side (21), the first side (21) is cleaned to form a clean area (211) on the first side (21), the clean area (211) includes a welding area (2111) and an annular area (2112) surrounding the welding area (2111). Get a cover plate (30), the cover plate (30) is provided with two pole posts (301) arranged at intervals along the Y direction, and the two pole posts (301) are welded and fixed to the corresponding pole post connecting parts (2) in the two welding areas (2111).
  12. The assembly process method of the cell structure (100) according to claim 11, wherein the step of obtaining two adapter plate structures (10), each adapter plate structure (10) including a terminal connection portion (2), the terminal connection portion (2) having a first side (21), and cleaning the first side (21) to form a cleaning area (211) on the first side (21), the cleaning area (211) including a welding area (2111) and an annular area (2112) surrounding the welding area (2111) includes: A laser is emitted under preset conditions using a laser device to clean the first side (21) of the pole connection (2).
  13. The assembly process of the cell structure (100) according to claim 12, wherein the laser power is P, and wherein the preset conditions include: 100W ≤ P ≤ 700W; and/or, The laser frequency is f, wherein the preset conditions include: 100Hz ≤ f ≤ 800Hz; and/or, The laser scanning speed is V, and the preset conditions include: 500mm/s≤V≤20000mm/s.
  14. According to the assembly process method of the cell structure (100) according to claim 11, each of the adapter plate structures (10) further includes a tab connection part (1), the tab connection part (1) is connected to the pole post connection part (2), and the step of obtaining the cover plate (30), the cover plate (30) is provided with two pole posts (301) arranged at intervals along the Y direction, and before the step of welding and fixing the two pole posts (301) to the corresponding pole post connection parts (2) in the two welding areas (2111) respectively, the method further includes: Two battery cells (20) are obtained, each of which has a first tab (202) and a second tab (203) arranged at intervals along the Y direction. The two battery cells (20) are arranged at intervals along the X direction, such that the two first tabs (202) of the two battery cells (20) are positioned opposite each other, and the two second tabs (203) of the two battery cells (20) are positioned opposite each other. Connect the tab connection part (1) of one of the two adapter plate structures (10) to the two first tabs (202) that are aligned, and connect the tab connection part (1) of the other of the two adapter plate structures (10) to the two second tabs (203) that are aligned.
  15. According to the assembly process method of the cell structure (100) according to claim 11, the step of obtaining the cover plate (30), the cover plate (30) being provided with two pole posts (301) spaced apart along the Y direction, and welding and fixing the two pole posts (301) to the corresponding pole post connecting parts (2) in the two welding areas (2111) respectively includes: In one of the two welding zones (2111), a laser penetrates one of the two transition piece structures (10) to weld one of the two transition piece structures (10) to one of the two pole posts (301); and/or, The other of the two welding zones (2111) is welded to the other of the two adapter structures (10) by laser penetration, so that the other of the two adapter structures (10) is welded to the other of the two pole posts (301).
  16. A large energy storage battery, the large energy storage battery comprising the cell structure (100) according to any one of claims 8 to 10.

Description

Adapter structure, cell structure and assembly process, and large energy storage battery This application claims priority to Chinese patent applications filed on October 28, 2024, with application numbers 202422608575.3 and 202411513878.5, the entire contents of which are incorporated herein by reference. Technical Field This application relates to the field of energy storage technology, specifically to an adapter structure, a cell structure, an assembly process method thereof, and a large energy storage battery. Background Technology The common assembly method for prismatic batteries is to pair the cells and weld them together with the adapter plate, and then use laser welding to fix the welding area of the adapter plate to the terminal post of the cover plate. Invention Overview Beneficial effects However, due to foreign matter adhering to the welding area or the presence of an oxide layer, defects may occur in the welding of the adapter and the pole. Firstly, this application provides an adapter plate structure. The adapter plate structure includes: The electrode connection part is configured to connect to the electrode of the battery cell; The electrode connection part is connected to the electrode tab connection part. The electrode connection part has a first side. The first side has a cleaning area that is configured to be cleaned. The cleaning area includes a welding area and an annular area surrounding the welding area. The welding area is configured to weld and fix the electrode connection part to the electrode of the cover plate. Secondly, this application also provides a battery cell structure. The battery cell structure includes an adapter plate structure. Thirdly, this application also provides an assembly process method for the battery cell structure, which includes the following steps; Two adapter plate structures are obtained, each of the adapter plate structures includes a pole post connection portion, the pole post connection portion has a first side, the first side is cleaned to form a clean area on the first side, the clean area includes a welding area and an annular area surrounding the welding area; A cover plate is obtained, the cover plate is provided with two poles arranged at intervals along the Y direction, and the two poles are welded and fixed to the corresponding pole connection parts in the two welding areas respectively. Fourthly, this application also provides a large energy storage battery. The large energy storage battery includes a cell structure. The adapter structure provided in this application consists of a tab connection part and a terminal connection part. The tab connection part is specifically responsible for connecting to the tabs of the battery cell, while the terminal connection part is responsible for connecting to the external terminal. This clear division of labor improves the stability and reliability of the overall structure. The clean area includes a welding area and a ring-shaped area surrounding the welding area. This design aims to ensure that the welding area is clean before welding, avoiding the influence of impurities, oxides, etc., on the welding quality, thereby improving the strength and reliability of the weld. A clean welding surface helps reduce poor contact caused by corrosion, oxidation, etc., thus extending the service life of large energy storage battery packs or related equipment. By clearly defining the clean area, subsequent maintenance and cleaning work becomes more targeted, reducing maintenance difficulty and cost. The terminal connection part is firmly connected to the battery cell terminal through welding, enhancing the stability and strength of the overall structure and helping to resist the influence of external factors such as vibration and impact. In addition, the existence of the "ring-shaped area" surrounding the welding area helps prevent external contaminants from entering the welding area during welding or connection, thereby improving the purity and stability of the connection and ensuring that the terminal connection part and the terminal can form a high-quality weld. Attached Figure Description Figure 1 is a schematic diagram of the adapter structure provided in the embodiments of this application; Figure 2 is a schematic diagram of the battery cell structure provided in the embodiments of this application; Figure 3 is one of the structural schematic diagrams of the adapter plate structure and pole shown in Figure 2; Figure 4 is the second schematic diagram of the adapter plate structure and pole structure shown in Figure 2; Figure 5 is a schematic diagram of the pole connection part and pole shown in Figure 2; Figure 6 is a magnified view of section A in Figure 5; Figure 7 is a flowchart of a first embodiment of the battery cell structure assembly process provided by the present invention. Figure 8 is a second flowchart of the assembly process method for the cell structure provided by an embodiment of the present inven