Battery cell

Abstract

A battery cell (100), comprising a casing (10), a pole (20), and a sealing member (30). The casing (10) comprises a side plate (11) and an end plate (12) connected to the side plate (11). A first through hole (101) is formed on the end plate (12). A pole connecting portion (21) of the pole (20) passes through the first through hole (101). A first end of the pole connecting portion (21) is provided with pole limiting portion (22). The pole limiting portion (22) is located on the side of the end plate (12) close to the side plate (11). The sealing member (30) comprises a first sealing portion (31) and a second sealing portion (32). The first sealing portion (31) is arranged around the pole connecting portion (21) and is located between the pole limiting portion (22) and the end plate (12).

Description

battery cells

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on August 8, 2023, with application number 202322142120.2. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a battery cell. Background Art

[0003] In the related art, in order to ensure the sealing between the pole and the shell of the battery cell, a seal is generally required to be provided between the pole and the shell. SUMMARY OF THE INVENTION

[0004] However, the internal temperature of the battery cell rises during operation, causing the pole to expand easily, resulting in the pole squeezing the seal and other components of the battery cell, causing the seal and other components of the battery cell to deform, thereby causing the battery cell insulation to fail and affecting stability.

[0005] The present application provides a battery cell. The battery cell includes:

[0006] The shell includes a side plate and an end plate connected to the side plate, and the end plate is provided with a first through hole;

[0007] The pole includes a pole connecting portion and a pole limiting portion, the pole connecting portion passes through the first through hole, the pole limiting portion is provided on the first end of the pole connecting portion, and the pole limiting portion is located on a side of the end plate close to the side plate;

[0008] The seal includes a first sealing portion and a second sealing portion. The first sealing portion is arranged around the second end of the pole connecting portion, and the first sealing portion is located between the pole limiting portion and the end plate. The first end of the second sealing portion is connected to the first sealing portion. The second sealing portion is arranged around the pole connecting portion, and the second sealing portion is interference fit with the inner side wall of the first through hole. Near the connection between the first sealing portion and the second sealing portion, the first sealing portion is provided with at least one groove on a side surface away from the first end of the pole connecting portion. The groove is configured to provide deformation space when the first sealing portion is squeezed. Beneficial effects

[0009] The battery cell provided by the present application is characterized in that the first sealing portion of the seal is arranged around the pole connecting portion and is located between the pole limiting portion and the end plate of the pole, and the second sealing portion of the seal is arranged around the pole connecting portion and passes through the first through hole of the shell. At the connection near the first sealing portion and the second sealing portion, at least one groove is provided on the surface of the first sealing portion away from the pole connecting portion. The setting of the groove provides an accommodating space for deformation of the connection between the first sealing portion and the second sealing portion. When the pole expands and squeezes the first sealing portion, the first sealing portion first deforms at the groove, which can reduce the squeezing of the first sealing portion caused by the expansion of the pole, thereby reducing the squeezing of the other components of the battery cell by the seal as a whole, thereby improving the stability of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] FIG1 is a perspective view of a battery cell provided in some embodiments of the present application.

[0011] FIG2 is a structural diagram of a battery cell pole terminal provided in some embodiments of the present application.

[0012] FIG3 is an exploded view of FIG2 .

[0013] FIG. 4 is a first structural diagram of the sealing member in FIG. 2 .

[0014] FIG. 5 is a second structural diagram of the sealing member in FIG. 2 .

[0015] FIG6 is an enlarged view of point A in FIG2 .

[0016] FIG7 is an enlarged view of point B in FIG2 .

[0017] FIG8 is an enlarged view of point C in FIG2 .

[0018] Description of reference numerals:

[0019] 100, battery cell; 10, housing; 11, side plate; 12, end plate; 101, first through hole; 102, third accommodating groove; 20, pole; 21, pole connecting portion; 22, pole limiting portion; 23, pole riveting portion;

[0020] 30. Sealing member; 31. First sealing portion; 32. Second sealing portion; 3101. Groove; 40. Riveted member; 401. First accommodating groove; 402. Second accommodating groove; 50. External insulating member; 501. Third through hole; 60. Internal insulating member; 601. Second through hole; 70. Adapter; D1. First reserved gap; D2. Second reserved gap; D3. Third reserved gap. Modes for Carrying Out the Invention

[0021] In the description of this application, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and can refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0022] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, with the first feature having a higher horizontal height than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, with the first feature having a lower horizontal height than the second feature.

[0023] In the description of this embodiment, terms such as "upper," "lower," "left," "right," "front," and "rear" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and do not have any special meanings.

[0024] As shown in FIG. 1 , FIG. 2 and FIG. 3 , this embodiment provides a battery cell 100 . The battery cell 100 includes a housing 10 , a terminal 20 , and a sealing member 30 .

[0025] The shell 10 includes a side plate 11 and an end plate 12 connected to the side plate 11. The side plate 11 and the end plate 12 are connected to form a hollow shell 10. The hollow shell 10 is used to accommodate the battery cell, and the tabs at the ends of the battery cell are connected to the adapter plate. A first through hole 101 is provided on the end plate 12. The first through hole 101 is for the pole 20 to pass through from the inside of the shell 10 to the outside of the shell 10, so that one end of the pole 20 is connected to the adapter plate 70, and the other end of the pole 20 is provided on the outside of the shell 10. The shell 10 can be made of aluminum material. The shell 10 made of aluminum material has high specific strength, specific modulus, fracture toughness, fatigue strength and corrosion resistance stability, and has the advantages of light weight and stable molding.

[0026] 1 is cylindrical, and the cylindrical side panels 11 and end panels 12 are connected to form a cylindrical housing 10. The side panels 11 can also be quadrangular, and the quadrangular side panels 11 and end panels 12 are connected to form a square housing 10.

[0027] The pole 20 includes a pole connection portion 21 and a pole stop portion 22. The pole connection portion 21 passes through the first through hole 101. The pole stop portion 22 is provided at a first end of the pole connection portion 21. The pole stop portion 22 is located within the housing 10 and on a side of the end plate 12 close to the side plate 11.

[0028] The diameter of the pole connecting portion 21 ranges from 3.0 mm to 6.5 mm, and the diameter of the pole connecting portion 21 can specifically be 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm, 5.0 mm, 5.5 mm, 6.0 mm, or 6.5 mm.

[0029] The seal 30 includes a first sealing portion 31 and a second sealing portion 32. The first sealing portion 31 is arranged around the pole connection portion 21, and the first sealing portion 31 is located between the pole limit portion 22 and the end plate 12. The first end of the second sealing portion 32 is connected to the first sealing portion 31, and the second sealing portion 32 is arranged around the pole connection portion 21. The second sealing portion 32 passes through the first through hole 101 so that the second sealing portion 32 seals the portion of the pole connection portion 21 arranged outside the housing 10, and the second sealing portion 32 is interference fit with the inner side wall of the first through hole 101. Near the connection between the first sealing portion 31 and the second sealing portion 32, at least one groove 3101 is provided on the side surface of the first sealing portion 31 away from the first end of the pole connection portion 21.

[0030] The groove 3101 is configured to provide space for the first sealing portion 31 to deform when it is squeezed. Specifically, the groove 3101 provides space for deformation at the junction of the first and second sealing portions 31, 32. Consequently, when the terminal 20 expands and squeezes the seal 30, the seal 30 first deforms in the groove 3101. This prevents the seal 30 from directly squeezing other parts of the battery cell 100 in contact with it, such as the wall of the first through-hole 101, due to the expansion force of the terminal 20. This reduces deformation of the end plate 12, minimizing the impact on the overall sealing of the housing 10 and, consequently, the stability of the battery cell 100.

[0031] As shown in Figure 4, the groove 3101 is arranged around the outer periphery of the second sealing part 32, that is, the groove 3101 is arranged cocentrically with the second sealing part 32, so that the groove 3101 accommodates the deformation occurring at the connection between the first sealing part 31 and the second sealing part 32 along the outer periphery of the second sealing part 32.

[0032] As shown in Figure 5, multiple grooves 3101 are arranged at intervals along the circumference of the second sealing part 32. The shape of the groove 3101 can be one of cylindrical, prismatic and hemispherical. The groove 3101 can be regular or irregular, so that the multiple grooves 3101 along the outer periphery of the second sealing part 32 accommodate the deformation occurring at the connection between the first sealing part 31 and the second sealing part 32.

[0033] The sealing member 30 may be made of fluororubber material. The sealing member 30 made of fluororubber material has good chemical resistance and is particularly suitable for sealing battery cells.

[0034] As shown in Figures 1 to 3 , the pole 20 further includes a pole riveting portion 23. The pole riveting portion 23 is provided on the second end of the pole connecting portion 21 and is located on a side of the end plate 12 away from the side plate 11.

[0035] Based on the arrangement of the pole rivet portion 23 , the pole 20 of the battery cell 100 can be connected to the housing 10 of the battery unit 100 by riveting, so as to ensure the connection strength between the pole 20 and the housing 10 .

[0036] There is a first difference between the radius of the pole rivet portion 23 and the radius of the pole connection portion 21. The first difference ranges from 0.3 mm to 0.8 mm. Specifically, the first difference can be 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, 0.55 mm, 0.6 mm, 0.65 mm, 0.7 mm, 0.75 mm, or 0.8 mm. Controlling the first difference between 0.3 mm and 0.8 mm reduces the risk of hidden cracks caused by expansion of the pole rivet portion 23.

[0037] As shown in Figures 1 to 3, the battery cell 100 also includes a rivet 40, which is at least partially located between the terminal rivet portion 23 and the end plate 12. A first receiving groove 401 is provided on the surface of the rivet 40 near the end plate 12. One end of the second sealing portion 32 of the seal 30 is connected to the first sealing portion 31, and the second end of the second sealing portion 32 is received in the first receiving groove 401. The second sealing portion 32 is embedded in the first receiving groove 401 to achieve a seal between the terminal 20 and the housing 10, preventing electrolyte leakage.

[0038] As shown in FIG6 , a first reserved gap D1 is defined between the second end of the second sealing portion 32 and the bottom wall of the first accommodating groove 401. The rivet 40 provides an accommodating space for the second sealing portion 32 to deform based on the provision of the first reserved gap D1. When the pole connecting portion 21 and / or the pole rivet 23 of the pole 20 expand and squeeze the second sealing portion 32 of the seal 30, the second sealing portion 32 deforms and fills the accommodating space formed by the rivet 40 based on the first reserved gap D1, thereby alleviating the second sealing portion 32 from being directly squeezed by the rivet 40 due to the expansion force of the pole connecting portion 21 and / or the pole rivet 23, reducing the risk of the rivet 40 cracking due to deformation, and improving the stability of the battery cell 100.

[0039] The first reserved gap D1 ranges from 0.1mm to 0.4mm. For example, the first reserved gap D1 can be specifically 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, or 0.4mm. The size of the first reserved gap D1 is controlled within a range of 0.1mm to 0.4mm to ensure that when the pole connecting portion 21 expands and compresses the second sealing portion 32, the accommodation space formed by the rivet 40 based on the setting of the first reserved gap D1 can accommodate the deformation of the second sealing portion 32, thereby releasing the deformation force generated by the compression of the second sealing portion 32, reducing the deformation of the rivet 40 caused by the deformation force of the second sealing portion 32, reducing the risk of the rivet 40 being deformed and cracked, and improving the stability of the battery cell 100.

[0040] As shown in Figures 1 to 3, a second receiving groove 402 is provided on the surface of the rivet 40 away from the end plate 12. The pole rivet portion 23 of the pole 20 is received in the second receiving groove 402 to achieve a connection between the pole rivet portion 23 and the rivet 40. The depth h1 of the second receiving groove 402 is greater than the thickness h2 of the pole rivet portion 23, which prevents the pole rivet portion 23 from protruding from the second receiving groove 402 beyond the surface of the rivet 40 away from the end plate 12, facilitating the welding of the connector to the multiple battery cells 100, so that the multiple battery cells 100 are connected in series and / or in parallel to form a battery module. The width of the second receiving groove 402 ranges from 3.4 mm to 7.0 mm to achieve riveted fixation between the rivet 40 and the pole 20. The width of the second receiving groove 402 should be greater than the diameter of the pole connecting portion 21. The depth h1 of the second accommodating groove 402 is in the range of 0.5 mm to 1.2 mm, so as to form an escape space for the pole 20 to expand in the direction of the thickness h2 of the pole rivet portion 23 .

[0041] As shown in FIG7 , a second reserved gap D2 is defined between the sidewall of the second accommodating groove 402 and the outer edge of the pole rivet portion 23. The second reserved gap D2 provides the rivet 40 with space for expansion of the pole rivet portion 23. The pole rivet portion 23 expands and fills the space created by the rivet 40 based on the second reserved gap D2. This alleviates the direct compression of the rivet 40 by the expansion force of the pole rivet portion 23, reduces the risk of deformation and cracking of the rivet 40, and improves the stability of the battery cell 100.

[0042] The second reserved gap D2 ranges from 0.25mm to 0.6mm. For example, the second reserved gap D2 can be specifically 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, or 0.6mm. The size of the second reserved gap D2 is controlled within a range of 0.25mm to 0.6mm to ensure that when the pole rivet 23 expands and compresses the rivet 40, the accommodating space formed by the rivet 40 based on the setting of the second reserved gap D2 can accommodate the expansion and deformation of the pole rivet 23, release the deformation force generated by the expansion of the pole rivet 23, reduce the deformation of the rivet 40 caused by the deformation force of the pole rivet 23, reduce the risk of the rivet 40 being deformed and cracked, and improve the stability of the battery cell 100.

[0043] As shown in Figures 1 to 3, the battery cell 100 also includes an external insulating member 50, which is arranged around the second sealing portion 32, and the external insulating member 50 is at least partially located between the rivet 40 and the end plate 12. A third through hole 501 is provided on the external insulating member 50, and the third through hole 501 and the first through hole 101 are arranged cocentrically. The second sealing portion 32 is passed through the third through hole 501, and the hole wall of the third through hole 501 abuts against the outer peripheral edge of the second sealing portion 32. The external insulating member 50 is configured to insulate between the rivet 40 and the end plate 12 to ensure an insulated connection between the pole 20 and the shell 10.

[0044] As shown in Figures 1 to 3, a third receiving groove 102 is provided on the surface of the end plate 12 near the outer insulating member 50. The third receiving groove 102 is arranged around the outer periphery of the second sealing portion 32. A portion of the outer insulating member 50 is accommodated within the third receiving groove 102, and the third receiving groove 102 is arranged coaxially with the first through-hole 101. The outer insulating member 50 is inserted and mated with the third receiving groove 102 to achieve a snap-fit ​​connection between the outer insulating member 50 and the end plate 12, ensuring an insulated connection between the pole rivet portion 23 and the end plate 12, thereby achieving insulation between the pole 20 and the housing 10.

[0045] As shown in Figures 1 to 3, the battery cell 100 also includes an internal insulator 60. The internal insulator 60 is at least partially located between the terminal stopper 22 and the end plate 12. The internal insulator 60 is configured to insulate the end plate 12 from the adapter plate 70. The internal insulator 60 defines a second through-hole 601, which is coaxially arranged with the first through-hole 101. The first sealing portion 31 at least partially passes through the second through-hole 601 to ensure sealing and insulation between the terminal 20 and the end plate 12.

[0046] As shown in FIG8 , a third reserved gap D3 is defined between the wall of the second through hole 601 and the outer periphery of the first sealing portion 31. The first sealing portion 31 is provided with an accommodation space for deformation based on the third reserved gap D3. When the pole connecting portion 21 and / or the pole limiting portion 22 of the pole 20 expand and squeeze the first sealing portion 31 of the seal 30, the first sealing portion 31 deforms to fill the accommodation space formed based on the third reserved gap D3, thereby alleviating the direct squeezing of the first sealing portion 31 on the inner insulating member 60 by the expansion force of the pole connecting portion 21 and / or the pole limiting portion 22, thereby reducing the risk of the inner insulating member 60 cracking due to deformation, and improving the stability of the battery cell 100.

[0047] The third reserved gap D3 ranges from 0.1mm to 0.4mm. For example, the first reserved gap D1 can be specifically 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, or 0.4mm. The size of the third reserved gap D3 is controlled to be 0.1mm to 0.4mm to ensure that when the pole connecting portion 21 and / or the pole limiting portion 22 expand and compress the first sealing portion 31, the accommodating space formed by the first sealing portion 31 based on the setting of the third reserved gap D3 can accommodate the deformation of the first sealing portion 31, thereby releasing the deformation force generated by the extrusion of the first sealing portion 31, reducing the deformation amount of the inner insulating member 60 affected by the deformation force of the first sealing portion 31, reducing the risk of the inner insulating member 60 being deformed and cracked, and improving the stability of the battery cell 100.

Claims

1. A battery cell (100), comprising: A shell (10), the shell (10) comprising a side plate (11) and an end plate (12) connected to the side plate (11), the end plate (12) being provided with a first through hole (101); A pole (20), the pole (20) comprising a pole connecting portion (21) and a pole limiting portion (23), the pole connecting portion (21) passing through the first through hole (101), the pole limiting portion (23) being arranged on a first end of the pole connecting portion (21), and the pole limiting portion (23) being located on a side of the end plate (12) close to the side plate (11); A sealing member (30), the sealing member (30) comprising a first sealing portion (31) and a second sealing portion (32), the first sealing portion (31) being arranged around the pole connecting portion (21), and the first sealing portion (31) being located between the pole limiting portion (23) and the end plate (12), the first end of the second sealing portion (32) being connected to the first sealing portion (31), the second sealing portion (32) being arranged around the pole connecting portion (21), and the second sealing portion (32) being interference fit with the inner side wall of the first through hole (101), and near the connection between the first sealing portion (31) and the second sealing portion (32), a side surface of the first sealing portion (31) away from the first end of the pole connecting portion (21) is provided with at least one groove (3101), the groove (3101) being configured to provide a deformation space for the first sealing portion (31) when it is squeezed.

2. The battery cell (100) according to claim 1, wherein: The groove (3101) is arranged around the outer periphery of the second sealing portion (32).

3. The battery cell (100) according to any one of claims 1 to 2, wherein: The plurality of grooves (3101) are arranged at intervals along the circumference of the second sealing portion (32).

4. The battery cell (100) according to any one of claims 1 to 3, wherein the pole further comprises a pole riveted portion (23), the pole riveted portion (23) being arranged on the second end of the pole connecting portion (21), and the pole riveted portion (23) being located on a side of the end plate (12) away from the side plate (11).

5. The battery cell (100) according to claim 4, wherein: The radius of the pole riveting portion (23) and the radius of the pole connecting portion (21) have a first difference, and the first difference ranges from 0.3 mm to 0.8 mm.

6. The battery cell (100) according to claim 4 or 5, further comprising a rivet (40), wherein the rivet (40) is at least partially located between the pole rivet portion (23) and the end plate (12), and a first accommodating groove (401) is provided on a surface of the rivet (40) close to the end plate (12), and the second end of the second sealing portion (32) is accommodated in the first accommodating groove (401).

7. The battery cell (100) according to claim 6, wherein: A first reserved gap (D1) is provided between the second end of the second sealing portion (32) and the bottom wall of the first accommodating groove (401), and the range of the first reserved gap (D1) is 0.1 mm to 0.4 mm.

8. The battery cell (100) according to claim 6 or 7, wherein: A second accommodating groove (402) is provided on a surface of the rivet member (40) away from the end plate (12), and the pole rivet portion (23) is accommodated in the second accommodating groove (402).

9. The battery cell (100) according to claim 8, wherein: A second reserved gap (D2) is provided between the side wall of the second accommodating groove (402) and the outer edge of the pole riveting portion (23), and the range of the second reserved gap (D2) is 0.25 mm to 0.6 mm.

10. The battery cell (100) according to any one of claims 6 to 9, further comprising an outer insulating member (50), the outer insulating member (50) surrounding the second sealing portion (32), and the outer insulating member (50) is at least partially located between the rivet (40) and the end plate (12).

11. The battery cell (100) according to claim 10, wherein: A third accommodating groove (102) is provided on a surface of the end plate (12) close to the outer insulating member (50), the third accommodating groove is arranged around the outer periphery of the second sealing portion (32), and a portion of the outer insulating member (50) is accommodated in the third accommodating groove.

12. The battery cell (100) according to any one of claims 1 to 11, further comprising an inner insulating member (60), wherein the inner insulating member (60) is at least partially located between the pole limiting portion (23) and the end plate (12), and the inner insulating member (60) is provided with a second through hole (601), and the first sealing portion (31) at least partially passes through the second through hole (601).

13. The battery cell (100) according to claim 12, wherein: A third reserved gap (D3) is provided between the hole wall of the second through hole (601) and the outer periphery of the first sealing portion (31), and the range of the third reserved gap (D3) is 0.1 mm to 0.4 mm.

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