Battery and battery pack

Abstract

The application provides a battery and a battery pack, wherein the battery comprises a shell, a sealing piece and a prop open piece, the shell comprises a shell body and a cover, the cover and the shell body enclose a cavity, the cover is provided with a liquid injection hole, the liquid injection hole penetrates the cover along the thickness direction of the cover; the sealing piece is inserted into the liquid injection hole and sealingly cooperates with the inner surface of the liquid injection hole, the sealing piece comprises an abutting portion, an insertion section and a through hole, the abutting portion abuts against the cover to limit the movement of the sealing piece towards the cavity, the insertion section is inserted into the liquid injection hole, and the through hole penetrates the abutting portion and the insertion section along the thickness direction of the cover; the prop open piece is inserted into the through hole and sealingly cooperates with the inner surface of the through hole, the prop open piece comprises a prop open portion in the through hole, and the prop open portion is in interference fit with the insertion section. The application can improve the problem of insufficient sealing stability of the sealing structure of the battery in the related art.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a battery and a battery pack. Background Technology

[0002] Battery capping assemblies typically have an injection port on the cap. After electrolyte is injected into the battery through the injection port, a sealing structure is needed to seal the injection port to prevent electrolyte leakage. In related technologies, the sealing structure is usually inserted into the injection port and connected to the cap to ensure a stable seal.

[0003] However, in related technologies, the sealing structure and the cap are usually connected by welding. However, after the sealing structure and the cap are welded, cracks are prone to appear at the weld, which affects the sealing stability of the sealing structure for the injection hole. Utility Model Content

[0004] The embodiments of this application provide a battery and a battery pack, which can improve the situation in related technologies where the weld between the sealing structure and the cover of the battery is prone to cracking, affecting the sealing stability of the sealing structure for the injection hole.

[0005] In a first aspect, embodiments of this application provide a battery, comprising:

[0006] The outer casing includes a shell and a cap, wherein the cap and the shell enclose a cavity, and the cap has an injection hole that penetrates the cap along its thickness direction.

[0007] A sealing element is inserted into the injection hole and seals against the inner surface of the injection hole. The sealing element includes an abutment portion, an insertion section, and a through hole. The abutment portion abuts against the cap to restrict the movement of the sealing element toward the cavity. The insertion section is inserted into the injection hole. The through hole extends through the abutment portion and the insertion section along the thickness direction of the cap.

[0008] A support member is inserted into the through hole and sealed to the inner surface of the through hole. The support member includes a support portion located within the through hole, and the support portion is interference-fitted with the insertion section.

[0009] In some embodiments, the expansion portion is fitted and connected to the inner surface of the through hole to improve the connection stability between the expansion portion and the insertion section and to prevent the expansion portion from moving along the thickness direction within the through hole.

[0010] In some embodiments, the insertion segment includes a limiting portion located within the cavity, and the spreading portion spreads the limiting portion so that the limiting portion overlaps with the orthogonal projection of the cap on the axial direction of the injection hole, so that the limiting portion can stably abut against the cap to restrict the seal from moving away from the cavity, that is, to stably connect the seal to the cap.

[0011] In some embodiments, the inner circumferential surface of the through hole is recessed to form a fitting groove, and the supporting portion is inserted into the fitting groove so that the supporting portion is fitted and connected to the inner surface of the through hole. By inserting the supporting portion into the fitting groove on the inner circumferential surface of the through hole, the fitting of the supporting portion to the inner circumferential surface of the through hole can be made more convenient, and the structure of the supporting member and the sealing member is simpler.

[0012] In some embodiments, the fitting groove extends circumferentially along the through hole to lengthen the fitting groove, which helps to improve the fitting stability between the support portion and the inner circumferential surface of the through hole.

[0013] In some embodiments, the expanding portion includes an end face and an outer peripheral face. The end face is located on the side of the expanding portion facing the cavity, and the outer peripheral face is adjacent to the end face. The angle formed by the outer peripheral face and the end face is an acute angle, and the fitting groove is inserted at the junction of the outer peripheral face and the end face. By making the angle between the outer peripheral face of the expanding portion and the end face facing the cavity acute, a relatively sharp cutting edge can be formed at the junction of the outer peripheral face and the end face of the expanding portion. When the expanding portion is inserted into the through hole, the junction of the outer peripheral face and the end face of the expanding portion can more easily cut into the inner peripheral face of the through hole, forming a fitting groove on the inner peripheral face of the through hole to fit with the expanding portion.

[0014] In some embodiments, the expansion portion is located within the injection hole. By positioning the expansion portion within the injection hole, the inner circumference of the injection hole can limit the portion where the seal and the expansion portion engage, reducing the risk of the expansion portion disengaging from the inner surface of the through hole due to radial outward deformation of the portion where the seal and the expansion portion engage.

[0015] In some embodiments, the limiting portion extends in a ring-shaped structure along the circumference of the through hole, thereby increasing the length of the limiting portion in the circumferential direction of the through hole, which is beneficial to improving the limiting effect of the limiting portion; or,

[0016] The limiting part includes a plurality of sub-limiting parts, which are arranged circumferentially along the through hole. The plurality of sub-limiting parts can also abut against the cover to restrict the seal from moving away from the cavity.

[0017] In some embodiments, a first sealing ring is fitted around the outer periphery of the expanding member, and the inner surfaces of the expanding member and the through hole press against the first sealing ring to achieve a sealing fit between the expanding member and the inner surface of the through hole. By pressing the inner surfaces of the expanding member and the through hole against the first sealing ring, the inner surfaces of the expanding member and the through hole can respectively adhere to the first sealing ring, thereby effectively sealing the gap between the expanding member and the inner surface of the through hole.

[0018] In some embodiments, the first sealing ring is located on the side of the expanding portion opposite to the cavity. When the expanding portion is inserted into the through hole and engages with the inner surface of the through hole, the expanding portion can better compress the first sealing ring, thereby further improving the sealing effect of the first sealing ring.

[0019] In some embodiments, the inner circumferential surface of the through hole is further provided with a limiting protrusion. The limiting protrusion is located on the side of the first sealing ring away from the spreading portion, and the limiting protrusion abuts against the first sealing ring. The limiting protrusion can limit the first sealing ring, preventing the first sealing ring from coming out of the through hole, which helps to improve the sealing stability of the first sealing ring.

[0020] In some embodiments, the limiting protrusion is arranged circumferentially along the through hole to further improve the limiting effect of the limiting protrusion on the first sealing ring.

[0021] In some embodiments, the expansion member includes a pull rod connected to the expansion portion on the side opposite to the cavity, and the first sealing ring is sleeved on the outer periphery of the pull rod, thereby making the position of the first sealing ring more stable, and the first sealing ring can stably seal the gap between the outer peripheral surface of the first pull rod and the inner peripheral surface of the through hole.

[0022] In some embodiments, the first sealing ring has a first annular sealing protrusion protruding on the side facing the cavity, and the first annular sealing protrusion surrounds the supporting member; the inner diameter of the first annular sealing protrusion is larger than the inner diameter of the first sealing ring, and the width of the first annular sealing protrusion is smaller than the width of the first sealing ring. When the supporting portion of the supporting member compresses the first sealing ring, the first annular sealing protrusion can fill the gap between the outer peripheral surface of the supporting portion and the inner peripheral surface of the through hole, thereby sealing the gap between the outer peripheral surface of the supporting portion and the inner peripheral surface of the through hole, further improving the sealing effect on the gap between the inner surface of the supporting member and the through hole.

[0023] In some embodiments, a second sealing ring is fitted around the outer periphery of the sealing member, and the inner surfaces of the sealing member and the injection hole press against the second sealing ring to achieve a sealing fit between the sealing member and the inner surface of the injection hole. By pressing the sealing member against the inner surface of the injection hole with the second sealing ring, the inner surfaces of the sealing member and the injection hole can be respectively made to fit against the second sealing ring, thereby effectively sealing the gap between the sealing member and the inner surface of the injection hole.

[0024] In some embodiments, the abutment portion is located on the side of the cap away from the cavity, and the abutment portion overlaps with the orthographic projection of the cap on the axial direction of the injection hole, so that the abutment portion can stably abut against the cap and restrict the movement of the seal toward the cavity;

[0025] The second sealing ring is arranged around the sealing element and is located on the side of the abutment portion facing the cavity. This makes the position of the second sealing ring more stable, and the abutment portion can stably compress the second sealing ring, which is beneficial to improving the sealing effect of the second sealing ring.

[0026] In some embodiments, the side of the cap opposite to the cavity is recessed to form a first groove, the bottom surface of the first groove is recessed to form a second groove, and the bottom surface of the second groove is provided with the injection hole.

[0027] The abutting portion is at least partially accommodated in the first groove and abuts against the bottom surface of the first groove, so that the position of the abutting portion relative to the cover is more stable; the second sealing ring is accommodated in the second groove, so that the position of the second sealing ring is positioned by the second groove, so that the position of the second sealing ring is more stable; the surface of the abutting portion facing the cavity and the bottom surface of the second groove clamp the second sealing ring, so that the surface of the abutting portion facing the cavity and the bottom surface of the second groove can stably fit with the second sealing ring, thereby improving the sealing effect of the second sealing ring.

[0028] In some embodiments, the second sealing ring has a second annular sealing protrusion protruding on the side facing the abutment portion. The second annular sealing protrusion surrounds the sealing element, and its outer diameter is smaller than the outer diameter of the second sealing ring, while its width is smaller than the width of the second sealing ring. Therefore, the abutment portion can compress the second annular sealing protrusion, which helps to further increase the compression of the second sealing ring and improve its sealing effect.

[0029] Secondly, embodiments of this application provide a battery pack including the battery as described above, the battery comprising:

[0030] The outer casing includes a shell and a cap, wherein the cap and the shell enclose a cavity, and the cap has an injection hole that penetrates the cap along its thickness direction.

[0031] A sealing element is inserted into the injection hole and seals against the inner surface of the injection hole. The sealing element includes an abutment portion, an insertion section, and a through hole. The abutment portion abuts against the cap to restrict the movement of the sealing element toward the cavity. The insertion section is inserted into the injection hole. The through hole extends through the abutment portion and the insertion section along the thickness direction of the cap.

[0032] A support member is inserted into the through hole and sealed to the inner surface of the through hole. The support member includes a support portion located within the through hole, and the support portion is interference-fitted with the insertion section.

[0033] The beneficial effects of the embodiments of this application are as follows:

[0034] The battery provided in this application embodiment has an electrolyte injection hole that extends through the thickness of the cover into a cavity formed by the shell and the cover.

[0035] After the electrode fluid is injected, the insert section of the battery's sealing component can be inserted into the injection hole, ensuring a tight seal between the sealing component and the inner surface of the injection hole. This prevents electrolyte leakage from the cavity through the gap between the sealing component and the inner surface of the injection hole. Simultaneously, the expander is inserted into the through-hole of the sealing component and seals with the inner surface of the through-hole, further preventing electrolyte leakage from the cavity through the gap between the expander and the inner surface of the through-hole, thus achieving a seal on the injection hole.

[0036] Based on this, by abutting the sealing element with the cap, the movement of the sealing element toward the cavity is restricted. Furthermore, by including a supporting portion within the through hole in the expanding member, and by ensuring an interference fit between the expanding portion and the insert section, the insert section can be expanded, making the fit between the insert section and the injection hole tighter. This prevents the insert section from easily dislodging from the injection hole, thus restricting the movement of the sealing element away from the cavity, and in other words, ensuring a stable connection between the sealing element and the cap.

[0037] Compared with the related technologies where the sealing structure and the cover of the battery are welded together and the weld seam between the sealing structure and the cover is prone to cracking, the connection between the sealing element and the cover of the battery provided in this application embodiment is more stable. There is no weld seam between the sealing element and the cover, and no cracks will be generated, which improves the sealing stability of the injection hole. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the structure of one embodiment of the battery pack provided in this application.

[0040] Figure 2 A schematic diagram of the structure of one embodiment of the battery provided in this application;

[0041] Figure 3 This is a schematic diagram of the structure of one embodiment of the cap, seal and expander provided in this application, wherein the expander has been fitted and connected to the inner surface of the through hole;

[0042] Figure 4 for Figure 3 A cross-sectional view along the AA direction;

[0043] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0044] Figure 6 A cross-sectional view of one embodiment of the cap, seal, and expander provided in this application, wherein the expander is not fitted into the inner surface of the through hole;

[0045] Figure 7 for Figure 6 Enlarged view of point B in the middle.

[0046] Explanation of reference numerals in the attached figures:

[0047] 1-Battery pack; 2-Battery module; 20-Battery; 200-Cavity; 201-Shell; 21-Positive terminal; 22-Negative terminal; 23-Cap; 231-First groove; 232-Second groove; 234-Injection hole; 24-Sealing element; 241-Abutting part; 242-Insertion section; 2421-Limiting part; 2422-Through hole; 2423-Matching groove; 243-Limiting protrusion; 25-Supporting element; 251-Supporting part; 2511-End face; 2512-Outer peripheral surface; 252-Pull rod; 26-First sealing ring; 261-First annular sealing protrusion; 27-Second sealing ring; 271-Second annular sealing protrusion; 30-Shell; 3-Box body; Z-Thickness direction. Detailed Implementation

[0048] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0049] This application provides a battery and a battery pack.

[0050] Figure 1 This is a schematic diagram of the structure of one embodiment of the battery pack provided in this application. Figure 1 As shown, the battery pack 1 includes a housing 3 and a battery module 2, with the battery module 2 housed within the housing 3. The battery module 2 includes multiple batteries 20.

[0051] like Figure 2 As shown, the battery pack 20 includes a housing 201. The housing 201 includes a cover 23 and a shell 30, with the cover 23 and the shell 30 forming a cavity 200. The battery pack 20 also includes a core pack (not shown), which is installed within the cavity 200. The cover 23 has a positive terminal 21 and a negative terminal 22, with the positive terminal 21 connected to the positive tab of the core pack and the negative terminal 22 connected to the negative tab of the core pack.

[0052] The cap 23 also has an injection hole 234, which penetrates the cap 23 along its thickness direction Z. Thus, the injection hole 234 communicates with the cavity 200 where the core package is installed. The injection hole 234 can be used to inject electrolyte into the cavity 200 of the housing 201. After the electrolyte injection is completed, the injection hole 234 is sealed by a sealing structure to prevent electrolyte leakage from the cavity 200 of the housing 201.

[0053] Specifically, the positive terminal 21 passes through the cover 23 and connects to the positive tab of the core package inside the cavity 200. The positive terminal 21 and the cover 23 are insulated from each other by an insulating element and remain sealed. The negative terminal 22 passes through the cover 23 and connects to the negative tab of the core package inside the cavity 200. The negative terminal 22 and the cover 23 are insulated from each other by an insulating element and remain sealed. The injection port 234 is located between the positive terminal 21 and the negative terminal 22 and passes through the cover 23.

[0054] In some embodiments, such as Figure 3 ,Figure 4 and Figure 5 As shown, the battery 20 also includes a seal 24, which is inserted into the injection hole 234 and seals against the inner surface of the injection hole 234 to prevent electrolyte leakage from the cavity 200 through the gap between the seal 24 and the inner surface of the injection hole 234. The seal 24 includes an abutment portion 241, an insertion section 242, and a through hole 2422. The abutment portion 241 abuts against the cap 23 to restrict the movement of the seal 24 toward the cavity 200. The through hole 2422 penetrates the abutment portion 241 and the insertion section 242 along the thickness direction Z of the cap 23.

[0055] The battery 20 also includes a support member 25, which is inserted into the through hole 2422 and seals against the inner surface of the through hole 2422 to prevent electrolyte leakage from the cavity 200 through the gap between the support member 25 and the inner surface of the through hole 2422. The support member 25 includes a support portion 251 located within the through hole 2422, which is interference-fitted with the insertion section 242.

[0056] The battery 20 provided in this application embodiment is formed by enclosing the core in the cavity 200 formed by the housing 30 and the cover 23 of the outer shell 201, and opening an injection hole 234 through the cover 23 along the thickness direction Z of the cover 23 to inject electrolyte into the cavity 200 through the injection hole 234.

[0057] After the electrode fluid is injected, the insertion section 242 of the sealing member 24 of the battery 20 can be inserted into the injection hole 234, and the sealing member 24 can be sealed with the inner surface of the injection hole 234 to prevent the electrolyte in the cavity 200 from leaking out from the gap between the sealing member 24 and the inner surface of the injection hole 234. At the same time, the expanding member 25 is inserted into the through hole 2422 of the sealing member 24 and seals with the inner surface of the through hole 2422 of the sealing member 24, which can prevent the electrolyte in the cavity 200 from leaking out from the gap between the expanding member 25 and the inner surface of the through hole 2422, thus sealing the injection hole 234.

[0058] Based on this, by making the abutting portion 241 of the seal 24 abut against the cap 23, the movement of the seal 24 toward the cavity 200 is restricted. Furthermore, by making the expanding member 25 include the expanding portion 251 located within the through hole 2422, and by making the expanding portion 251 and the insertion section 242 interference fit, the expanding portion 252 can expand the insertion section 242, making the fit between the insertion section 242 and the injection hole 234 tighter, and preventing the insertion section 242 from easily dislodging from the injection hole 234, the movement of the seal 24 toward the direction away from the cavity 200 is restricted; that is, the seal 24 is stably connected to the cap 23.

[0059] Compared with the related technologies where the sealing structure of the battery 20 is welded to the cover 23 and the weld seam between the sealing structure and the cover 23 is prone to cracking, the connection between the sealing element 24 and the cover 23 of the battery 20 provided in this application embodiment is more stable. There is no weld seam between the sealing element 24 and the cover 23, and no cracks will be generated, which improves the sealing stability of the injection hole 234.

[0060] In some embodiments, the expansion portion 251 can be fitted and connected to the inner surface of the through hole 2422 to improve the connection stability between the expansion portion 251 and the insertion section 242 and prevent the expansion portion 251 from moving along the thickness direction Z in the through hole 2422.

[0061] In some embodiments, the insertion segment 242 may include a limiting portion 2421 located within the cavity 200, and the spreading portion 251 may spread the limiting portion 2421 so that the limiting portion 2421 overlaps with the orthogonal projection of the cap 23 in the axial direction of the injection hole 234. This allows the limiting portion 2421 to stably abut against the cap 23, thereby restricting the movement of the seal 24 away from the cavity 200, that is, ensuring a stable connection between the seal 24 and the cap 23.

[0062] In some embodiments, the inner circumferential surface of the through hole 2422 may be recessed to form a fitting groove 2423, and the supporting portion 251 may be inserted into the fitting groove 2423 to fit and connect with the inner surface of the through hole 2422. By inserting the supporting portion 251 into the fitting groove 2423 on the inner circumferential surface of the through hole 2422, the fitting of the supporting portion 251 with the inner circumferential surface of the through hole 2422 becomes more convenient, and the structure of the supporting member 25 and the sealing member 24 becomes simpler.

[0063] The fitting groove 2423 can be extended along the circumference of the through hole 2422 to lengthen the fitting groove 2423, which is beneficial to improving the fitting stability of the support portion 251 and the inner circumferential surface of the through hole 2422.

[0064] It should be noted that the fitting groove 2423 can be an annular groove extending circumferentially along the through hole 2422, or it can be a curved groove segment extending circumferentially along the through hole 2422. Alternatively, the fitting groove 2423 can also be multiple groove segments distributed at intervals circumferentially along the through hole 2422.

[0065] Alternatively, a fitting groove 2423 can be provided on the outer peripheral surface 2512 of the supporting part 251, and a fitting part can be provided on the inner surface of the through hole 2422. When the supporting part 251 is inserted into the through hole 2422, the fitting part on the inner peripheral surface of the through hole 2422 is inserted into the fitting groove 2423 on the outer peripheral surface 2512 of the supporting part 251, thereby fitting the supporting part 251 with the inner surface of the through hole 2422.

[0066] Alternatively, a fitting groove 2423 can be pre-machined on the inner surface of the through hole 2422 or the outer peripheral surface 2512 of the supporting part 251. Alternatively, when the supporting part 251 is inserted into the through hole 2422, the supporting part 251 and the inner surface of the through hole 2422 are pressed against each other, thereby forming the fitting groove 2423 on the inner surface of the through hole 2422 or the outer peripheral surface 2512 of the supporting part 251. Of course, the latter simplifies the structure of the supporting member 25 and the sealing member 24.

[0067] In some embodiments, such as Figure 5 As shown, the supporting part 251 includes an end face 2511 and an outer peripheral face 2512. The end face 2511 of the supporting part 251 is located on the side of the supporting part 251 facing the cavity 200. The outer peripheral face 2512 of the supporting part 251 is adjacent to the end face 2511. The included angle formed by the outer peripheral face 2512 of the supporting part 251 and the end face 2511 is an acute angle. The fitting groove 2423 is inserted at the junction of the outer peripheral face 2512 of the supporting part 251 and the end face 2511. By making the angle between the outer peripheral surface 2512 of the expansion portion 251 and the end face 2511 facing the cavity 200 side acute, a relatively sharp cutting edge can be formed at the junction of the outer peripheral surface 2512 and the end face 2511 of the expansion portion 251. When the expansion portion 251 is inserted into the through hole 2422, the junction of the outer peripheral surface 2512 and the end face 2511 of the expansion portion 251 can more easily cut into the inner peripheral surface of the through hole 2422, and a fitting groove 2423 is formed on the inner peripheral surface of the through hole 2422 to fit with the expansion portion 251.

[0068] In some embodiments, the expansion portion 251 may be located within the injection hole 234. It is understood that the portion of the seal 24 located within the injection hole 234 is limited by the inner circumferential surface of the injection hole 234, making it less prone to radial outward expansion deformation. By positioning the expansion portion 251 within the injection hole 234, the inner circumferential surface of the injection hole 234 can limit the portion where the seal 24 and the expansion portion 251 engage, reducing the risk of radial outward expansion deformation of the portion where the seal 24 and the expansion portion 251 engage, which could lead to the expansion portion 251 disengaging from the inner surface of the through hole 2422.

[0069] Specifically, the end face 2511 of the expansion portion 251 facing the cavity 200 can be flush with the side of the cap 23 facing the cavity 200, or the end face 2511 of the expansion portion 251 facing the cavity 200 can be further away from the cavity 200 than the side of the cap 23 facing the cavity 200, so that the expansion portion 251 is located inside the injection hole 234.

[0070] In some embodiments, the limiting portion 2421 can be extended in a ring structure along the circumferential direction of the through hole 2422, thereby increasing the length of the limiting portion 2421 in the circumferential direction of the through hole 2422, which is beneficial to improving the limiting effect of the limiting portion 2421.

[0071] Specifically, the limiting part 2421 is flared towards the cavity 200. The diameter of the circumscribed circle of the radial cross-section of the outer peripheral surface 2512 of the limiting part 2421 gradually increases in the direction approaching the cavity 200. The radial cross-sectional shape of the outer peripheral surface 2512 of the limiting part 2421 can be circular, elliptical, polygonal, etc., and is not limited here. Similarly, the through hole 2422 can be circular, elliptical, polygonal, etc., and is not limited here.

[0072] In other embodiments, the limiting portion 2421 may include a plurality of sub-limiting portions 2421, which are spaced apart circumferentially along the through hole 2422. Thus, the plurality of sub-limiting portions 2421 can also abut against the cover 23 to restrict the movement of the seal 24 away from the cavity 200.

[0073] In the embodiments of this application, such as Figure 6 and Figure 7 As shown, after the electrolyte injection is completed, the expander 25 can be inserted into the through hole 2422 of the seal 24 in the direction away from the cavity 200, and the seal 24 can be inserted into the injection hole 234, so that the expander portion 251 of the expander 25 is located on the side of the limiting portion 2421 facing the cavity 200. Then, a pulling force is applied to the expander 25, so that the expander portion 251 of the expander 25 is forcibly squeezed into the through hole 2422 in the direction away from the cavity 200, and the limiting portion 2421 is expanded, so that the limiting portion 2421 is deformed outward in the direction away from the through hole 2422 until the limiting portion 2421 and the orthogonal projection of the cap 23 on the axial direction of the injection hole 234 overlap, so that the limiting portion 2421 can stably abut against the cap 23, thereby restricting the movement of the seal 24 in the direction away from the cavity 200.

[0074] The expansion member 25 may include a pull rod 252 connected to the expansion portion 251 on the side opposite to the cavity 200. Thus, by pulling the pull rod 252, a pulling force can be easily applied to the expansion portion 251, forcibly pressing it into the through hole 2422 in a direction away from the cavity 200. Afterwards, the portion of the pull rod 252 protruding from the cover 23 can be removed by cutting or shearing.

[0075] like Figure 7 As shown, when the limiting part 2421 is not opened by the opening part 251, the outer diameter of the limiting part 2421 is A2, and the inner diameter of the through hole 2422 located in the limiting part 2421 is A3. The maximum outer diameter of the opening part 251 can be greater than A3 and less than or equal to A2, so that the opening part 251 can more easily enter the through hole 2422 and fit with the inner circumferential surface of the through hole 2422 and open the limiting part 2421. Specifically, the maximum outer diameter of the opening part 251 can be (A2+A3) / 2.

[0076] In some embodiments, the outer diameter A2 of the limiting portion 2421 may be greater than or equal to 4 mm and less than or equal to 8 mm. Additionally, the inner diameter A3 of the through hole 2422 located in the limiting portion 2421 may be greater than or equal to 1.5 mm and less than or equal to 6 mm.

[0077] In some embodiments, the outer diameter A2 of the limiting portion 2421 can be smaller than the inner diameter of the injection hole 234, so that the limiting portion 2421 can pass through the injection hole 234 and extend into the cavity 200. The difference between the outer diameter A2 of the limiting portion 2421 and the inner diameter of the injection hole 234 is greater than or equal to 0.03 mm and less than or equal to 0.07 mm, so that the limiting portion 2421 can pass through the injection hole 234 and extend into the cavity 200, while ensuring that the limiting portion 2421, after being opened by the spreading portion 251, can stably abut against the cap 23. The specific difference between the outer diameter A2 of the limiting portion 2421 and the inner diameter of the injection hole 234 can be 0.04 mm, 0.05 mm, 0.06 mm, etc., and is not limited here.

[0078] like Figure 5 As shown, the outer diameter of the pull rod 252 is A4. The outer diameter A4 of the pull rod 252 can be greater than or equal to 1mm and less than or equal to 5mm, so that the pull rod 252 has high strength and is convenient for the pull rod 252 to pull the opening part 251.

[0079] In some embodiments, such as Figure 5 As shown, a first sealing ring 26 can be fitted around the outer periphery of the expanding member 25. The first sealing ring 26 is pressed against the inner surface of the expanding member 25 and the through hole 2422 to achieve a sealing fit between the expanding member 25 and the inner surface of the through hole 2422. By pressing the first sealing ring 26 against the inner surface of the expanding member 25 and the through hole 2422, the inner surfaces of the expanding member 25 and the through hole 2422 can be made to fit against the first sealing ring 26, thereby effectively sealing the gap between the inner surface of the expanding member 25 and the through hole 2422.

[0080] The first sealing ring 26 can be positioned on the side of the expansion portion 251 away from the cavity 200. Therefore, when the expansion portion 251 is inserted into the through hole 2422 and engages with the inner surface of the through hole 2422, the expansion portion 251 can better compress the first sealing ring 26, thereby further improving the sealing effect of the first sealing ring 26.

[0081] In some embodiments, a limiting protrusion 243 may be provided on the inner circumferential surface of the through hole 2422. The limiting protrusion 243 is located on the side of the first sealing ring 26 away from the spreading portion 251, and the limiting protrusion 243 abuts against the first sealing ring 26. Thus, the limiting protrusion 243 can limit the first sealing ring 26, preventing the first sealing ring 26 from coming out of the through hole 2422, which helps to improve the sealing stability of the first sealing ring 26.

[0082] The limiting protrusion 243 can be arranged circumferentially along the through hole 2422 to further improve the limiting effect of the limiting protrusion 243 on the first sealing ring 26.

[0083] like Figure 5 As shown, the expansion member 25 includes a pull rod 252 connected to the expansion part 251 on the side away from the cavity 200, which can make the first sealing ring 26 fit around the outer periphery of the pull rod 252, thereby making the position of the first sealing ring 26 more stable, and the first sealing ring 26 can stably seal the gap between the outer peripheral surface 2512 of the first pull rod 252 and the inner peripheral surface of the through hole 2422.

[0084] In some embodiments, the outer diameter A4 of the pull rod 252 can be smaller than the inner diameter of the first sealing ring 26 to reduce the interference from the first sealing ring 26 when the pull rod 252 pulls the expansion part 251 to move. The difference between the outer diameter A4 of the pull rod 252 and the inner diameter of the first sealing ring 26 can be greater than or equal to 0.03 mm and less than or equal to 0.07 mm, thereby reducing the interference of the first sealing ring 26 on the pull rod 252 while ensuring that the first sealing ring 26 can stably seal the gap between the pull rod 252 and the inner circumferential surface of the through hole 2422. Specifically, the difference between the outer diameter A4 of the pull rod 252 and the inner diameter of the first sealing ring 26 can be 0.04 mm, 0.05 mm, 0.06 mm, etc., and is not limited here.

[0085] In some embodiments, such as Figure 5 As shown, a first annular sealing protrusion 261 can be provided on the side of the first sealing ring 26 facing the cavity 200, and the first annular sealing protrusion 261 is arranged around the support member 25. The inner diameter of the first annular sealing protrusion 261 is larger than the inner diameter of the first sealing ring 26, and the width of the first annular sealing protrusion 261 is smaller than the width of the first sealing ring 26. Therefore, when the supporting portion 251 of the support member 25 compresses the first sealing ring 26, the first annular sealing protrusion 261 can fill the gap between the outer peripheral surface 2512 of the supporting portion 251 and the inner peripheral surface of the through hole 2422, so as to seal the gap between the outer peripheral surface 2512 of the supporting portion 251 and the inner peripheral surface of the through hole 2422, further improving the sealing effect on the gap between the inner surface of the support member 25 and the through hole 2422.

[0086] like Figure 7As shown, the total thickness of the first sealing ring 26 and the first annular sealing protrusion 261 in the thickness direction Z of the cover 23 is B1. The total thickness B1 of the first sealing ring 26 and the first annular sealing protrusion 261 in the thickness direction Z of the cover 23 can be greater than or equal to 0.8 mm and less than or equal to 1.5 mm to ensure good sealing performance. The total thickness B1 of the first sealing ring 26 and the first annular sealing protrusion 261 in the thickness direction Z of the cover 23 can be 0.9 mm, 1 mm, 1.2 mm, etc., and is not limited here.

[0087] In some embodiments, a second sealing ring 27 may be fitted around the outer periphery of the sealing member 24. The second sealing ring 27 is pressed against the inner surfaces of the sealing member 24 and the injection hole 234 to achieve a sealing fit between the sealing member 24 and the inner surface of the injection hole 234. By pressing the second sealing ring 27 against the inner surface of the sealing member 24 and the injection hole 234, the inner surfaces of the sealing member 24 and the injection hole 234 can respectively adhere to the second sealing ring 27, thereby effectively sealing the gap between the inner surfaces of the sealing member 24 and the injection hole 234.

[0088] The abutment portion 241 can be located on the side of the cap 23 away from the cavity 200, and the abutment portion 241 and the cap 23 overlap in the axial projection of the injection hole 234, so that the abutment portion 241 can stably abut against the cap 23 and restrict the movement of the seal 24 toward the cavity 200.

[0089] In some embodiments, the second sealing ring 27 can be disposed around the seal 24, with the second sealing ring 27 located on the side of the abutment portion 241 facing the cavity 200. This makes the position of the second sealing ring 27 more stable, and the abutment portion 241 can stably compress the second sealing ring 27, which is beneficial to improving the sealing effect of the second sealing ring 27.

[0090] In some embodiments, such as Figure 5As shown, a first groove 231 is recessed on the side of the cap 23 facing away from the cavity 200, and a second groove 232 is recessed on the bottom surface of the first groove 231. An injection hole 234 is provided on the bottom surface of the second groove 232. The abutment portion 241 is at least partially accommodated in the first groove 231 and abuts against the bottom surface of the first groove 231, making the position of the abutment portion 241 relative to the cap 23 more stable. The second sealing ring 27 is accommodated in the second groove 232, which positions the second sealing ring 27, making its position more stable. The surface of the abutment portion 241 facing the cavity 200 and the bottom surface of the second groove 232 clamp the second sealing ring 27, thereby ensuring that the surface of the abutment portion 241 facing the cavity 200 and the bottom surface of the second groove 232 are stably fitted with the second sealing ring 27, improving the sealing effect of the second sealing ring 27.

[0091] In some embodiments, the second sealing ring 27 may have a second annular sealing protrusion 271 protruding from the side facing the abutment portion 241, and the second annular sealing protrusion 271 is disposed around the sealing member 24. The outer diameter of the second annular sealing protrusion 271 is smaller than the outer diameter of the second sealing ring 27, and the width of the second annular sealing protrusion 271 is smaller than the width of the second sealing ring 27. Therefore, the abutment portion 241 can compress the second annular sealing protrusion 271, which helps to further increase the compression amount of the second sealing ring 27 and improve the sealing effect of the second sealing ring 27.

[0092] In some embodiments, the through hole 2422 penetrates the abutment portion 241 of the seal 24. The outer diameter A4 of the pull rod 252 can be smaller than the inner diameter of the through hole 2422 at the abutment portion 241 to reduce interference from the abutment portion 241 when the pull rod 252 pulls the opening portion 251. The difference between the outer diameter A4 of the pull rod 252 and the inner diameter of the through hole 2422 at the abutment portion 241 can be greater than or equal to 0.03 mm and less than or equal to 0.07 mm. Specifically, the difference between the outer diameter A4 of the pull rod 252 and the inner diameter of the through hole 2422 at the abutment portion 241 can be 0.04 mm, 0.05 mm, 0.06 mm, etc., and is not limited here.

[0093] In some trials, such as Figure 7 As shown, the seal 24 includes an insertion section 242 extending from the abutment portion 241 into the cavity 200, the insertion section 242 extending along the thickness direction Z of the cap 23. The insertion section 242 passes through the injection hole 234 and extends into the cavity 200. The portion of the insertion section 242 located within the cavity 200 forms a limiting portion 2421. Specifically, in the thickness direction Z of the cap 23, the length of the insertion section 242 can be greater than the depth of the injection hole 234, so that the insertion section 242 can pass through the injection hole 234 and extend into the cavity 200.

[0094] In some embodiments, the length of the insertion segment 242 in the thickness direction Z of the cap 23 is B2. The length B2 of the insertion segment 242 in the thickness direction Z of the cap 23 can be greater than or equal to 1.5 mm and less than or equal to 5 mm, so that the insertion segment can pass through the injection hole 234 and extend into the cavity 200. Specifically, the length B2 of the insertion segment 242 in the thickness direction Z of the cap 23 can be 1.7 mm, 2 mm, 3 mm, etc., and is not limited here.

[0095] In some embodiments, such as Figure 7 As shown, the thickness of the abutment portion 241 in the thickness direction Z of the cover 23 is B3. The thickness B3 of the abutment portion 241 in the thickness direction Z of the cover 23 can be less than or equal to the depth of the first groove 231 in the thickness direction Z of the cover 23, so as to avoid the abutment portion 241 protruding from the surface of the cover 23 away from the cavity 200.

[0096] Specifically, the thickness B3 of the abutment portion 241 in the thickness direction Z of the cover 23 is greater than or equal to 0.4 mm and less than or equal to 0.8 mm, so that the abutment portion 241 has high strength while being able to be accommodated within the first groove 231. The thickness B3 of the abutment portion 241 in the thickness direction Z of the cover 23 can specifically be 0.5 mm, 0.6 mm, 0.7 mm, etc., and is not limited here.

[0097] In some embodiments, such as Figure 5 As shown, the maximum outer diameter of the abutment portion 241 is A1. The maximum outer diameter A1 of the abutment portion 241 can be greater than or equal to 4 mm and less than or equal to 12 mm, so that the abutment portion 241 has high strength and can stably abut against the cover 23. Among them, A1, A2, A3 and A4 gradually decrease.

[0098] This application also provides a battery pack, which includes a battery. The specific structure of the battery is as described in the above embodiments. Since this battery pack adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0099] The battery pack 1 may include a housing 3 and a battery module 2, with the battery module 2 housed within the housing 3. The battery module 2 includes multiple batteries 20, the structure of which can be referred to in the above embodiments and is not limited herein.

[0100] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A battery, characterized in that, include: The outer casing includes a shell and a cover, wherein the cover and the shell enclose a cavity, and the cover has an injection hole that penetrates the cover along its thickness direction. A sealing element is inserted into the injection hole and seals against the inner surface of the injection hole. The sealing element includes an abutment portion, an insertion section, and a through hole. The abutment portion abuts against the cap to restrict the movement of the sealing element toward the cavity. The insertion section is inserted into the injection hole. The through hole extends through the abutment portion and the insertion section along the thickness direction of the cap. A support member is inserted into the through hole and sealed to the inner surface of the through hole. The support member includes a support portion located within the through hole, and the support portion is interference-fitted with the insertion section.

2. The battery as described in claim 1, characterized in that, The supporting part is fitted and connected to the inner surface of the through hole.

3. The battery as described in claim 2, characterized in that, The insertion section includes a limiting part located within the cavity, and the expanding part expands the limiting part so that the limiting part overlaps with the orthogonal projection of the cover on the axial direction of the injection hole.

4. The battery as described in claim 2, characterized in that, The inner circumferential surface of the through hole is recessed to form a fitting groove, and the supporting part is inserted into the fitting groove so that the supporting part is fitted and connected to the inner surface of the through hole.

5. The battery as described in claim 4, characterized in that, The fitting groove extends circumferentially along the through hole.

6. The battery as described in claim 4, characterized in that, The supporting portion includes an end face and an outer peripheral face. The end face is located on the side of the supporting portion facing the cavity. The outer peripheral face is adjacent to the end face. The angle formed by the outer peripheral face and the end face is an acute angle. The fitting groove is inserted at the junction of the outer peripheral face and the end face.

7. The battery as claimed in claim 1, characterized in that, The expansion portion is located inside the injection hole.

8. The battery as described in claim 3, characterized in that, The limiting portion extends circumferentially along the through hole in a ring structure; or, The limiting part includes a plurality of sub-limiting parts, which are arranged at intervals along the circumference of the through hole.

9. The battery according to any one of claims 1 to 8, characterized in that, The outer periphery of the expanding member is fitted with a first sealing ring, and the inner surfaces of the expanding member and the through hole press against the first sealing ring so that the expanding member and the inner surface of the through hole are sealed together.

10. The battery as claimed in claim 9, characterized in that, The first sealing ring is located on the side of the expansion portion away from the cavity.

11. The battery as claimed in claim 10, characterized in that, The inner circumferential surface of the through hole is also provided with a limiting protrusion, which is located on the side of the first sealing ring away from the spreading part, and the limiting protrusion abuts against the first sealing ring.

12. The battery as claimed in claim 11, characterized in that, The limiting protrusion is arranged circumferentially along the through hole.

13. The battery as claimed in claim 9, characterized in that, The expansion member includes a pull rod connected to the side of the expansion portion away from the cavity, and the first sealing ring is sleeved on the outer periphery of the pull rod.

14. The battery as claimed in claim 9, characterized in that, The first sealing ring has a first annular sealing protrusion protruding on the side facing the cavity, and the first annular sealing protrusion is arranged around the support member; the inner diameter of the first annular sealing protrusion is larger than the inner diameter of the first sealing ring, and the width of the first annular sealing protrusion is smaller than the width of the first sealing ring.

15. The battery according to any one of claims 1 to 8, characterized in that, A second sealing ring is fitted around the outer periphery of the sealing element. The inner surfaces of the sealing element and the injection hole press against the second sealing ring to make the sealing element and the inner surface of the injection hole seal together.

16. The battery as claimed in claim 15, characterized in that, The abutting part is located on the side of the cap away from the cavity, and the abutting part overlaps with the orthogonal projection of the cap on the axial direction of the injection hole; The second sealing ring is disposed around the sealing element, and the second sealing ring is located on the side of the abutment portion facing the cavity.

17. The battery as claimed in claim 16, characterized in that, The cap has a first groove recessed on the side opposite to the cavity, and a second groove is formed on the bottom surface of the first groove. The injection hole is provided on the bottom surface of the second groove. The abutting portion is at least partially accommodated in the first groove and abuts against the bottom surface of the first groove; the second sealing ring is accommodated in the second groove, and the surface of the abutting portion facing the cavity clamps the second sealing ring with the bottom surface of the second groove.

18. The battery as claimed in claim 16, characterized in that, The second sealing ring has a second annular sealing protrusion on the side facing the abutment portion. The second annular sealing protrusion surrounds the sealing element. The outer diameter of the second annular sealing protrusion is smaller than the outer diameter of the second sealing ring, and the width of the second annular sealing protrusion is smaller than the width of the second sealing ring.

19. A battery pack, characterized in that, Includes the battery as described in any one of claims 1 to 18.

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