Pole assembly and battery

Abstract

The utility model relates to energy storage equipment technical field especially, relates to a kind of pole assembly and battery, including pole piece and sealing assembly.Wherein, pole piece includes columnar part and first protruding part, columnar part part is located in the through-hole of the end plate of battery shell, along the radial direction of pole piece, the size of first protruding part is greater than the size of through-hole.Sealing assembly includes first sealing ring and second sealing ring, first sealing ring and second sealing ring are all sleeved on pole piece, first sealing ring and part second sealing ring are laminated and clamped between first protruding part and end plate, along the axial direction of pole piece, when first sealing ring and second sealing ring are not compressed, the height H of first sealing ring protruding second sealing ring The value range is 0.05mm-0.15mm.Battery includes battery shell and above-mentioned pole assembly, and pole assembly is located at the through-hole of the end plate of battery shell.The pole assembly and battery have higher airtightness, with higher quality.

Description

Technical Field

[0001] This utility model relates to the field of energy storage equipment technology, and in particular to a pole assembly and a battery. Background Technology

[0002] The terminal assembly is one of the core structures of a cylindrical battery, and it is generally located on the end plate of the cylindrical battery. An integrated sealed terminal assembly includes the terminal piece and a sealing ring fitted onto it. The sealing ring seals the gap between the terminal piece and the end plate of the cylindrical battery. During assembly, one end of the terminal assembly is first passed through a through hole in the end plate. Then, a jig is used to press down on that end of the terminal assembly. Under pressure, the terminal assembly deforms, forming a limiting protrusion structure to fix the terminal assembly at the battery end plate. However, cylindrical batteries processed using this method have relatively low airtightness at the terminal assembly, resulting in a high defect rate when assembly and processing errors exist. Utility Model Content

[0003] One objective of this invention is to provide a terminal assembly that can improve the airtightness of the battery and enhance battery quality.

[0004] To achieve this objective, the present invention adopts the following technical solution:

[0005] A pole assembly is provided, comprising:

[0006] An electrode post includes a columnar portion and a first protrusion. The columnar portion is located within a through hole in the end plate of the battery housing. Along the radial direction of the electrode post, the size of the first protrusion is larger than the size of the through hole.

[0007] The sealing assembly includes a first sealing ring and a second sealing ring. Both the first sealing ring and the second sealing ring are sleeved on the pole piece. The first sealing ring and part of the second sealing ring are stacked and sandwiched between the first protrusion and the end plate. Along the axial direction of the pole piece, when neither the first sealing ring nor the second sealing ring is compressed, the height H of the first sealing ring protruding from the second sealing ring ranges from 0.05mm to 0.15mm.

[0008] Optionally, a limiting groove is formed on the end face of the first annular portion of the second sealing ring facing the end plate, and the first sealing ring portion is located within the limiting groove.

[0009] Optionally, the inner curved surface of the first sealing ring is attached to the outer wall of the columnar portion;

[0010] Alternatively, the inner curved surface of the first sealing ring is attached to the inner sidewall of the limiting groove.

[0011] Optionally, both the first protrusion and the first sealing ring are located on the side of the end plate facing the outside of the battery.

[0012] Optionally, the second sealing ring further includes a tubular portion sandwiched between the columnar portion and the inner wall of the through hole.

[0013] Optionally, the pole piece further includes a second protrusion, the first protrusion and the second protrusion are respectively located on both sides of the end plate, and the second sealing ring further includes a second annular portion, the second annular portion being sandwiched between the second protrusion and the end plate.

[0014] Optionally, the heat distortion temperature of the first sealing ring is higher than that of the second sealing ring.

[0015] Optionally, the compression of the first sealing ring is 0.1 mm;

[0016] And / or, the compression of the second sealing ring ranges from 0.34mm to 0.46mm.

[0017] Optionally, the first sealing ring is made of PFA, PBT or FKM;

[0018] And / or, the material of the second sealing ring is PFA, PBT or FKM.

[0019] Another objective of this invention is to provide a battery with higher airtightness and higher quality.

[0020] To achieve this objective, the present invention adopts the following technical solution:

[0021] A battery is provided, including a battery housing and the aforementioned terminal assembly, wherein the terminal assembly is located at a through hole in an end plate of the battery housing.

[0022] The beneficial effects of this utility model are:

[0023] This utility model provides an electrode assembly, including an electrode component and a sealing assembly. The electrode component includes a columnar portion and a first protrusion. The columnar portion is partially located within a through-hole in the end plate of the battery casing. Along the radial direction of the electrode component, the size of the first protrusion is larger than the size of the through-hole. The sealing assembly includes a first sealing ring and a second sealing ring, both of which are fitted onto the electrode component. The first sealing ring and a portion of the second sealing ring are stacked and sandwiched between the first protrusion and the end plate. Along the axial direction of the electrode component, when neither the first nor the second sealing ring is compressed, the height H of the first sealing ring protruding from the second sealing ring ranges from 0.05mm to 0.15mm. By providing the first sealing ring, and by having the first sealing ring protrude from the second sealing ring, the airtightness between the first protrusion of the electrode component and the end plate of the battery casing can be further improved. Therefore, this electrode assembly can improve airtightness and improve battery quality.

[0024] This invention also provides a battery, including a battery casing and the aforementioned terminal assembly, the terminal assembly being located at the through-hole of the end plate of the battery casing. This battery has higher airtightness and higher mass. Attached Figure Description

[0025] Figure 1 This is a partially exploded structural diagram of the battery provided in an embodiment of the present invention;

[0026] Figure 2 This is a partial structural cross-sectional view of the battery provided in an embodiment of this utility model;

[0027] Figure 3 This is a partially exploded structural diagram of the battery (the first sealing ring is attached to the outer wall of the columnar part) provided in this embodiment of the utility model;

[0028] Figure 4 This is a partial structural cross-sectional view of the battery (the first sealing ring is attached to the outer wall of the columnar part) provided in this embodiment of the utility model.

[0029] In the picture:

[0030] 1. Pole post; 11. Columnar part; 12. First protrusion; 13. Second protrusion;

[0031] 2. First sealing ring;

[0032] 3. Second sealing ring; 31. First annular portion; 311. Limiting groove; 32. Tubular portion; 33. Second annular portion;

[0033] 10. Terminal assembly; 20. Battery casing; 201. End plate. Detailed Implementation

[0034] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the drawings, not all of them.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] The terminal assembly is one of the core structures of a cylindrical battery, and it is generally located on the end plate of the cylindrical battery. An integrated sealed terminal assembly includes the terminal piece and a sealing ring fitted onto it. The sealing ring seals the gap between the terminal piece and the end plate of the cylindrical battery. During assembly, one end of the terminal assembly is first passed through a through hole in the end plate. Then, a jig is used to press down on that end of the terminal assembly. Under pressure, the terminal assembly deforms, forming a limiting protrusion structure to fix the terminal assembly at the battery end plate. However, cylindrical batteries processed using this method have relatively low airtightness at the terminal assembly, resulting in a high defect rate when assembly and processing errors exist.

[0038] Therefore, this embodiment provides a terminal assembly 10 to solve the above problems. The terminal assembly 10 can improve the airtightness of the battery and improve the battery quality.

[0039] like Figures 1-4As shown, the terminal assembly 10 of this embodiment includes a terminal member 1 and a sealing assembly. The terminal member 1 includes a columnar portion 11 and a first protrusion 12. The columnar portion 11 is partially located within a through hole in the end plate 201 of the battery housing 20. Along the radial direction of the terminal member 1, the size of the first protrusion 12 is larger than the size of the through hole. The sealing assembly includes a first sealing ring 2 and a second sealing ring 3. Both the first sealing ring 2 and the second sealing ring 3 are sleeved on the terminal member 1. The first sealing ring 2 and a portion of the second sealing ring 3 are stacked and sandwiched between the first protrusion 12 and the end plate 201. Along the axial direction of the terminal member 1, when neither the first sealing ring 2 nor the second sealing ring 3 is compressed, the height H of the first sealing ring 2 protruding from the second sealing ring 3 ranges from 0.05mm to 0.15mm.

[0040] By setting a first sealing ring 2, which protrudes beyond the second sealing ring 3 along the axial direction of the terminal post 1, the airtightness between the first protrusion 12 of the terminal post 1 and the end plate 201 of the battery casing 20 can be further improved. Therefore, this terminal post assembly 10 can improve the airtightness of the battery and improve battery quality. However, when the height H of the first sealing ring 2 protruding beyond the second sealing ring 3 is less than 0.05 mm, the height of the protrusion is too small, and the improvement in airtightness is not significant. When the height H of the first sealing ring 2 protruding beyond the second sealing ring 3 is greater than 0.15 mm, the protrusion is too high, resulting in excessive compression and an excessive reaction force of the first sealing ring 2 on the terminal post 1, which is not conducive to ensuring the morphological stability of the terminal post 1.

[0041] Optionally, a limiting groove 311 is formed on the end face of the first annular portion 31 of the second sealing ring 3 facing the end plate 201, and the first sealing ring 2 is partially located in the limiting groove 311, which can prevent the first sealing ring 2 from shifting and ensure that the airtightness enhancement effect of the first sealing ring 2 is consistent along the circumference of the pole piece 1.

[0042] Alternatively, in some embodiments, such as Figure 1 and Figure 2 As shown, the inner curved surface of the first sealing ring 2 is attached to the inner side wall of the limiting groove 311, that is, the first sealing ring 2 does not contact the outer wall of the columnar part 11 of the pole post 1. This design can ensure that the relative position between the first sealing ring 2 and the second sealing ring 3 is more stable.

[0043] Alternatively, in other embodiments, such as Figure 3 and Figure 4 As shown, the inner curved surface of the first sealing ring 2 is attached to the outer wall of the columnar portion 11. Since the clamping force of the first protrusion 12 and the second protrusion 13 is greater closer to the outer wall of the columnar portion 11, the first sealing ring 2 is located in this position to ensure that it is compressed in place and the airtightness is effectively improved.

[0044] Optionally, the second sealing ring 3 further includes a tubular portion 32, which is sandwiched between the columnar portion 11 and the inner wall of the through hole to insulate and seal the area.

[0045] Optionally, the pole piece 1 further includes a second protrusion 13, with the first protrusion 12 and the second protrusion 13 located on opposite sides of the end plate 201. The second sealing ring 3 further includes a second annular portion 33, which is sandwiched between the second protrusion 13 and the end plate 201. Optionally, the first protrusion 12 and the second protrusion 13 are located at opposite ends of the pole piece 1 along its own axial direction, and the second annular portion 33 and the second protrusion 13 are protruding structures formed when the pole piece assembly 10 is assembled and pressed.

[0046] Optionally, in this embodiment, the first protrusion 12 and the first sealing ring 2 are both located on the side of the end plate 201 facing the outside of the battery. Correspondingly, the first annular portion 31 of the second sealing ring 3 is also located on the side of the end plate 201 facing the outside of the battery.

[0047] Alternatively, in other embodiments, the first annular portion 31 of the first protrusion 12, the first sealing ring 2, and the second sealing ring 3 may all be located on the side of the end plate 201 facing the inside of the battery.

[0048] Optionally, along the radial direction of the pole piece 1, the first annular portion 31 protrudes beyond the first protrusion 12 to ensure that the first protrusion 12 is insulated from the end plate 201. Optionally, along the radial direction of the pole piece 1, the second annular portion 33 protrudes beyond the second protrusion 13 to ensure that the second protrusion 13 is insulated from the end plate 201.

[0049] Optionally, the compression of the second sealing ring 3 is in the range of 0.34mm-0.46mm to meet the basic airtightness requirements of the integrated sealing design of the pole assembly 10. Optionally, the compression of the first sealing ring 2 is 0.1mm to meet the airtightness improvement requirements of the integrated sealing design of the pole assembly 10.

[0050] Optionally, the heat deformation temperature of the first sealing ring 2 is higher than that of the second sealing ring 3. That is, the first sealing ring 2 also prevents the heat from directly burning the first annular portion 31 of the second sealing ring 3 during welding of the first protrusion 12 of the pole piece 1 to the external connector, thus preventing deformation and failure of the first annular portion 31. Therefore, the higher heat deformation temperature of the first sealing ring 2 compared to the second sealing ring 3 further ensures the airtightness of the product.

[0051] Optionally, the first sealing ring 2 is made of PFA (soluble polytetrafluoroethylene), PBT (polybutylene terephthalate), or FKM (fluororubber). Optionally, the second sealing ring 3 is made of PFA, PBT, or FKM. Optionally, in this embodiment, the first sealing ring 2 is made of PFA, and the second sealing ring 3 is made of PBT, to ensure that the heat distortion temperature of the first sealing ring 2 is higher than that of the second sealing ring 3.

[0052] This embodiment also provides a battery, including a battery casing 20 and the aforementioned terminal assembly 10, wherein the terminal assembly 10 is located at the through hole of the end plate 201 of the battery casing 20. Optionally, the battery casing 20 is a steel casing. Optionally, the battery is a cylindrical battery.

[0053] This battery has higher airtightness and higher mass.

[0054] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A pole assembly, characterized in that, include: The pole piece (1) includes a columnar portion (11) and a first protrusion (12). The columnar portion (11) is partially located in the through hole of the end plate (201) of the battery housing (20). Along the radial direction of the pole piece (1), the size of the first protrusion (12) is larger than the size of the through hole. The sealing assembly includes a first sealing ring (2) and a second sealing ring (3). The first sealing ring (2) and the second sealing ring (3) are both sleeved on the pole piece (1). The first sealing ring (2) and part of the second sealing ring (3) are stacked and sandwiched between the first protrusion (12) and the end plate (201). Along the axial direction of the pole piece (1), when neither the first sealing ring (2) nor the second sealing ring (3) is compressed, the height H of the first sealing ring (2) protruding from the second sealing ring (3) is in the range of 0.05mm-0.15mm.

2. The pole assembly according to claim 1, characterized in that, The first annular portion (31) of the second sealing ring (3) has a limiting groove (311) on its end face facing the end plate (201), and the first sealing ring (2) is partially located in the limiting groove (311).

3. The pole assembly according to claim 2, characterized in that, The inner curved surface of the first sealing ring (2) is attached to the outer wall of the columnar part (11); Alternatively, the inner curved surface of the first sealing ring (2) is attached to the inner sidewall of the limiting groove (311).

4. The pole assembly according to claim 1, characterized in that, The first protrusion (12) and the first sealing ring (2) are both located on the side of the end plate (201) facing the outside of the battery.

5. The pole assembly according to claim 1, characterized in that, The second sealing ring (3) also includes a tubular portion (32), which is sandwiched between the columnar portion (11) and the inner wall of the through hole.

6. The pole assembly according to claim 1, characterized in that, The pole piece (1) further includes a second protrusion (13), the first protrusion (12) and the second protrusion (13) are located on both sides of the end plate (201), and the second sealing ring (3) further includes a second annular portion (33), which is sandwiched between the second protrusion (13) and the end plate (201).

7. The pole assembly according to claim 1, characterized in that, The heat deformation temperature of the first sealing ring (2) is higher than that of the second sealing ring (3).

8. The pole assembly according to claim 1, characterized in that, The compression of the first sealing ring (2) is 0.1 mm; And / or, the compression of the second sealing ring (3) ranges from 0.34mm to 0.46mm.

9. The pole assembly according to claim 1, characterized in that, The material of the first sealing ring (2) is PFA, PBT or FKM; And / or, the material of the second sealing ring (3) is PFA, PBT or FKM.

10. A battery, characterized in that, Includes a battery housing (20) and a terminal assembly as described in any one of claims 1-9, wherein the terminal assembly (10) is located at a through hole in the end plate (201) of the battery housing (20).

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