Battery cover plate and battery

Abstract

A battery cover plate and a battery. The battery cover plate is used for sealing a battery housing, and comprises: a base plate (400) provided with a mounting hole (410); a terminal post (100) and a fixing sleeve (160), the terminal post (100) comprising a main body portion (170) and an extension portion (150) connected to each other, the fixing sleeve (160) being sleeved on the extension portion (150) and fixed to an upper side of the base plate (400), and a bottom end of the main body portion (170) being at least partially located in the mounting hole (410); and a fixing ring (200) sleeved on the bottom end of the main body portion (170) and welded to the main body portion (170), wherein an end surface of the bottom end of the main body portion (170) is higher than a welding surface of the fixing ring (200), and is used to block welding spatter from falling onto the end surface of the bottom end of the main body portion (170). When the fixing ring (200) is a metal ring and is welded to the main body portion (170), welding spatter is blocked by the end surface of the main body portion (170) that is higher than the welding surface, thereby preventing the welding spatter from splashing onto the end surface of the main body portion (170), maintaining the cleanliness of the end surface of the main body portion (170), and thus facilitating connection with other components.

Description

A battery cover and a battery Technical Field

[0001] This invention relates to the field of battery technology, and more specifically, to a battery cover and a battery. Background Technology

[0002] Lithium-ion batteries generally consist of a cover plate, positive and negative electrode plates, positive and negative electrode terminals, upper and lower insulating pads, and internal battery cells. The positive and negative electrode components are typically fixed together by riveting, which requires riveting molds and increases production costs.

[0003] The internal space of lithium-ion batteries is extremely valuable, and existing technologies typically compress the space of the cover plate to increase the internal space of the battery. For example, Chinese patent document CN216980802U discloses a power battery top cover and a power battery. The top cover includes an insulating plate, a top cover sheet, an upper plastic layer, a conductive block, and a terminal post. The conductive block is located inside the upper plastic layer, which is located above the top cover sheet. The insulating plate is located below the top cover sheet, and the terminal post is located below the insulating plate. The bottom of the insulating plate, the top cover sheet, and the upper plastic layer are all provided with through holes. The protrusion on the upper surface of the terminal post is welded to the conductive block from bottom to top through the through holes of the insulating plate, the top cover sheet, and the upper plastic layer to form an electronic channel. The lower surface of the terminal post is in direct contact with the current collector on the bare battery cell.

[0004] However, the positive electrode conductive block and the positive electrode post of the battery top cover are welded together. The positive electrode post is in the form of a ring structure and is welded to the end step of the positive electrode conductive block. When the positive electrode conductive block and the ring-shaped positive electrode post are welded, welding slag will be generated. The welding slag may be splashed onto the end face of the positive electrode conductive block, affecting the subsequent connection between the end face of the positive electrode conductive block and other components. Summary of the Invention

[0005] The purpose of this invention is to provide a battery cover and a battery, which solves the problem in the prior art where the positive electrode conductive block and the annular positive electrode post are welded together on the battery top cover, and welding slag is generated during the welding process, which may sputter onto the end face of the positive electrode conductive block.

[0006] To achieve the above objectives, the present invention provides a battery cover for sealing a battery casing, comprising a substrate having a mounting hole; a terminal post and a fixing sleeve, the terminal post comprising a connected main body portion and an extension portion, the fixing sleeve being sleeved on the extension portion and fixed to the upper side of the substrate, the bottom end of the main body portion being at least partially located in the mounting hole; and a fixing ring sleeved on the bottom end of the main body portion and welded to the main body portion, the end face of the bottom end of the main body portion being higher than the welding surface of the fixing ring to prevent welding slag from falling onto the end face of the bottom end of the main body portion.

[0007] Through the above technical solution, the outer extension of the electrode post is connected to the fixing sleeve, which is fixed to the substrate, thus keeping the electrode post and the substrate fixed. The fixing ring is sleeved at the bottom end of the main body. The fixing ring reduces the space occupied by the additional cover plate, which helps to improve the space utilization rate inside the battery. Moreover, the end face of the bottom end of the main body is higher than the welding surface of the fixing ring. When the fixing ring is a metal ring and is welded to the main body, the welding slag will be blocked by the higher end face of the main body, preventing welding slag from splashing onto the end face of the main body, keeping the end face of the main body clean, and thus facilitating connection with other components.

[0008] Furthermore, the bottom end of the main body tapers towards the center of the main body to form a stepped portion, and the welding spot of the fixing ring and the main body surrounds the outer periphery of the stepped portion.

[0009] The stepped section can form a stepped surface that facilitates the positioning and installation of the fixing ring, and the end face of the stepped section is higher than the welding surface of the fixing ring, further improving the blocking of welding slag.

[0010] Furthermore, the stepped portion has at least one step, and the outer radial direction of each step decreases progressively towards the bottom end face of the main body. The welding part of the fixing ring to the main body is fitted onto the second or higher step counting upwards from the bottom end face of the main body.

[0011] The stepped section has at least one layer. When the stepped section has two or more layers, the outer diameter of the stepped section closer to the cell side is smaller, which can form a blocking structure. When the fixing ring is a metal ring, the metal ring is welded to the stepped section with a non-minimum outer diameter. The stepped section with the minimum outer diameter can act as a blocking structure to prevent weld slag from splashing onto the end face of the stepped section with the minimum outer diameter, that is, to prevent weld slag from splashing onto the end face of the main body near the cell side, thereby avoiding interference with the installation of other connectors on the end face of the main body near the cell side.

[0012] Furthermore, the center of the fixing ring is the ring opening, and the base of the fixing ring near the ring opening is provided with at least one or a ring of thickened parts, and the main body is provided with a clearance groove corresponding to the thickened parts.

[0013] To avoid the retaining ring occupying internal space of the battery cell, it is usually made thinner. Thin metal sheets are prone to weld burn-through defects due to heat concentration during welding. The thickened part can conduct and store heat, reducing weld burn-through defects. When the thickened part is set in one or more places, the relief groove can also play a positioning role, preventing the retaining ring from moving during welding and affecting the welding quality. If the thickened part is a ring, it is best to press the retaining ring tightly during welding.

[0014] Furthermore, the thickened portion has a wedge-shaped cross-section, and at least one side abuts against the inner wall of the recessed groove.

[0015] The thickened part abuts against the inside of the relief groove, which can conduct heat to the pole, further avoiding weld burn-through defects.

[0016] Furthermore, a transition portion and an extension portion are sequentially provided on the outer side of the base of the fixing ring; the three are connected in sequence outside the ring opening of the fixing ring to form a stepped structure; the fixing ring is secured to the lower side of the mounting hole through the extension portion.

[0017] The ring is fitted onto the outer bottom end of the main body, serving to position and install the fixing ring and the terminal post. The fixing ring is secured to the lower side of the mounting hole via an extension, reducing the space occupied outside the cover plate mounting hole, thus compressing the size of the fixing ring and further improving the utilization rate of the battery's internal space.

[0018] Furthermore, the step portion has at least two layers, the upper surface of the ring base and the supporting surface of the step are both horizontal, and the lower surface of the ring base is flush with the step surface of the lower step for welding.

[0019] The stepped portion of the pole facilitates the positioning of the ring and the pole, and the stepped surface creates a recessed space to accommodate the ring base, allowing the ring base to overlap with the pole. This minimizes the space occupied by the fixing ring on the cover plate, improving space utilization. Furthermore, the stepped portion can limit the positioning of the fixing ring, enhancing structural stability. The stepped portion has at least two layers, with the upper surface of the ring base and the supporting surface of the step being horizontal, providing support and positioning for the fixing ring in the height direction.

[0020] Furthermore, the pole is a composite structure, including an aluminum composite part and a copper composite part connected together, the stepped part is disposed in the copper composite part, the fixing ring is a metal ring, and the metal ring is electrically connected to the copper composite part.

[0021] Composite terminals combine the conductivity of copper with the lightweight and low cost of aluminum. Through special processing techniques, such as cold rolling and composite casting, copper and aluminum are tightly bonded together to form a robust composite structure. This high bonding strength ensures that the terminal will not delaminate or detach during use, guaranteeing the stability and reliability of current transmission. A metal ring connects to the copper composite part; the metal ring can be made of copper, simplifying the welding process for two components made of the same material.

[0022] Furthermore, the pole and the mounting hole are sealed together by a seal. The sealing ring is elastic, providing insulation while improving the sealing performance of the cover plate.

[0023] Furthermore, the sealing element is a sealing ring, comprising a separate upper seal and a lower seal; the upper seal is disposed between the pole post and the substrate, and the lower seal is located between the fixing ring and the substrate.

[0024] The sealing ring consists of an upper seal and a lower seal, which can be embedded in different positions within the cover plate to improve the utilization of the cover plate space. Moreover, the upper seal can provide additional protection for the lower seal. Even if the lower seal is not sealing well, the upper seal can still provide good sealing for the cover plate, preventing the battery from leaking air from the cover plate.

[0025] Furthermore, the upper and lower sealing rings are pre-installed in the mounting holes.

[0026] The upper and lower seals are pre-installed separately, which reduces the assembly difficulty of the cover plate and ensures good sealing performance while making assembly easy.

[0027] Furthermore, the upper surface of the substrate is provided with a plurality of fixing grooves along the outer periphery of the mounting holes, and a plurality of fixing posts that cooperate with the fixing grooves are provided below the fixing sleeve.

[0028] The multiple fixing posts of the fixing sleeve cooperate with the fixing groove of the substrate to form the anti-rotation structure of the fixing sleeve, which prevents the fixing sleeve and the pole post from deflecting on the substrate and increases the stability of the fixing assembly of the pole post and the substrate.

[0029] Furthermore, the distance between the top surface of the ring base and the bottom surface of the extension is Z≥0.3mm.

[0030] The distance between the top surface of the ring base and the bottom surface of the extension determines the overall height of the metal ring, which helps to reduce the space occupied and also takes into account the structural strength of the fixed ring.

[0031] Furthermore, the included angle between the transition portion and the extension portion is 85°≤β≤100°.

[0032] The spacing between the ring base and the extension is adjusted according to the angle between the transition section and the extension. When the angle is acute or obtuse, the spacing between the parallel ring base and extension is smaller than when the angle is right. This results in a smaller longitudinal space occupied by the fixing ring, making it appear flatter and improving the utilization of the battery's internal space.

[0033] Furthermore, the main body is used to install a connector on the end face near the battery cell. The connector is provided with a positioning center. The vertical projection of the positioning center covers the geometric center point of the main body near the end face of the battery cell. The positioning center penetrates or partially penetrates the connector.

[0034] The connector is used to connect the tabs and terminals inside the battery, thereby completing the conduction of current. The locating core can position the connector during welding to the terminal, reducing welding errors.

[0035] Furthermore, the outer end face of the main body is provided with a pole post groove. The pole post groove can position the pole post, which is beneficial for the welding process.

[0036] Furthermore, a stop frame is connected to the bottom of the substrate, the stop frame is provided with a relief groove, and the extension extends to the location of the relief groove.

[0037] The retaining bracket is used to secure the battery cover, ensuring a tight fit between the cover and the battery casing and preventing displacement of the cover during battery use, thereby guaranteeing the structural stability and safety of the battery. The recessed groove provides extension space for the extension section, which can improve the space utilization of the cover and save internal battery space.

[0038] The present invention also provides a battery, including the battery cover plate described above.

[0039] Compared with existing known technologies, the technical solution provided by this invention has the following beneficial effects:

[0040] This invention discloses a battery cover plate in which the outer extension of the terminal post is connected to a fixing sleeve, which is fixed to a substrate, thereby keeping the terminal post and the substrate fixed. A fixing ring is sleeved on the bottom end of the main body. The fixing ring reduces the space occupied by the cover plate, which helps to improve the space utilization rate inside the battery. Moreover, the end face of the bottom end of the main body is higher than the bottom face of the fixing ring. When the fixing ring is a metal ring and is welded to the main body, the welding slag will be blocked by the higher end face of the main body, preventing welding slag from splashing onto the end face of the main body, keeping the end face of the main body clean, and thus facilitating connection with other components.

[0041] It is obvious that the elements or features described in the above individual embodiments can be used alone or in combination in other embodiments. Attached Figure Description

[0042] The dimensions and scales in the accompanying drawings do not represent the dimensions and scales of the actual product. The drawings are for illustrative purposes only, and some non-essential elements or features have been omitted for clarity.

[0043] Figure 1 is a three-dimensional structural diagram of the cover plate in an embodiment of the present invention;

[0044] Figure 2 is a top view of the cover plate in an embodiment of the present invention;

[0045] Figure 3 is a cross-sectional view at point AA in Figure 2;

[0046] Figure 4 is a schematic diagram of the structure in an embodiment of the present invention where the end face of the pole post is higher than the bottom surface of the fixing ring;

[0047] Figure 5 is a structural schematic diagram of the stepped section (two-layer steps) in an embodiment of the present invention;

[0048] Figure 6 is a schematic diagram of the structure of the metal ring in an embodiment of the present invention;

[0049] Figure 7 is a schematic diagram of the structure of the cover plate (with pole groove) in an embodiment of the present invention.

[0050] Explanation of reference numerals in the attached drawings: 100, pole post; 110, aluminum composite part; 120, copper composite part; 130, stepped part; 140, pole post groove; 150, extension part; 160, fixing sleeve; 170, main body part; 171, clearance groove; 200, fixing ring; 210, ring opening; 220, ring base; 221, thickened part; 230, transition part; 240, extension part; 300, connector; 310, positioning center; 400, base plate; 410, mounting hole; 500, sealing element; 510, upper seal; 520, lower seal; 600, stop bracket. Detailed Implementation

[0051] The present invention will now be described in detail with reference to the accompanying drawings. The embodiments described herein are merely preferred embodiments of the invention; those skilled in the art can conceive of other ways to implement the invention based on these preferred embodiments, and such other ways also fall within the scope of the invention.

[0052] Example

[0053] Referring to Figures 1-7, this embodiment provides a battery cover for sealing a battery casing, including a substrate 400 with mounting holes 410; a terminal post 100 and a fixing sleeve 160. The terminal post 100 includes a connected main body portion 170 and an extension portion 150. The fixing sleeve 160 is sleeved on the extension portion 150 and fixed to the upper side of the substrate 400. The bottom end of the main body portion 170 is at least partially located in the mounting hole 410. A fixing ring 200 is sleeved on the bottom end of the main body portion 170 and welded to the main body portion 170. The end face of the bottom end of the main body portion 170 is higher than the welding surface of the fixing ring 200 to prevent welding slag from falling onto the end face of the bottom end of the main body portion 170.

[0054] It is understandable that the extension portion 150 of the electrode post 100 is connected to the fixing sleeve 160, and the fixing sleeve 160 is fixed on the substrate 400, so that the electrode post 100 and the substrate 400 are kept fixed. The fixing ring 200 is sleeved on the bottom end of the main body portion 170. The fixing ring 200 reduces the space occupied by the additional cover plate, which is beneficial to improving the space utilization inside the battery. Moreover, the end face of the bottom end of the main body portion 170 is higher than the welding surface of the fixing ring 200. When the fixing ring 200 is a metal ring and is welded to the main body portion 170, the welding slag will be blocked by the end face of the main body portion 170 which is higher than the welding surface, avoiding the welding slag from splashing onto the end face of the main body portion 170, keeping the end face of the main body portion 170 clean, and thus facilitating connection with other components. It should be noted that, in addition to the end face of the main body portion 170 being higher, the welding position of the welding ring 200 can also be made lower, so that the end face of the bottom end of the main body portion 170 is higher than the welding surface of the main body portion 170 and the fixing ring 200.

[0055] Furthermore, as shown in Figures 3 and 4, the bottom end of the main body 170 tapers towards the center of the main body 170 to form a stepped portion 130, and the weld between the retaining ring 200 and the main body 170 surrounds the outer periphery of the stepped portion 130. The stepped portion 130 can form a stepped surface that facilitates the positioning and installation of the retaining ring 200, and the end face of the stepped portion 130 is higher than the welding surface of the retaining ring 200, further improving the blocking of weld slag.

[0056] In some embodiments, as shown in FIG5, the stepped portion 130 has at least one step, and the outer radial direction of each step decreases progressively towards the bottom end face of the main body portion 170. The welding portion of the fixing ring 200 to the main body portion 170 is fitted onto the second or higher step counted upwards from the bottom end face of the main body portion 170. It can be understood that the higher step is the third or higher step counted upwards from the bottom end face of the main body portion 170. The stepped portion 130 has at least one layer. When the stepped portion 130 has two or more layers, the outer diameter of the stepped portion 130 closer to the cell side is smaller, which can form a blocking structure. When the fixing ring 200 is a metal ring, the metal ring is welded to the stepped portion 130 with a non-minimum outer diameter. The stepped portion 130 with the minimum outer diameter can act as a blocking structure to prevent weld slag from splashing onto the end face of the stepped portion 130 with the minimum outer diameter, that is, to prevent weld slag from splashing onto the end face of the main body portion 170 near the cell side, thereby avoiding interference with the installation of other connecting parts on the end face of the main body portion 170 near the cell side.

[0057] In some embodiments, as shown in FIG4, the center of the fixing ring 200 is the ring opening 210, and the ring base 220 of the fixing ring 200 near the ring opening 210 is provided with at least one or a ring of thickened portions 221, and the main body 170 is provided with a relief groove 171 corresponding to the thickened portions 221. In order to avoid the fixing ring 200 occupying the internal space of the battery cell, it is generally made thinner. Thin metal sheets are prone to heat concentration and weld penetration defects during welding. The thickened portions 221 can play the role of conducting and storing heat, reducing weld penetration defects. When the thickened portions 221 are provided in one or more places, the relief groove 171 can also play a positioning role to prevent the fixing ring 200 from moving during welding and affecting the welding quality. If the thickened portions 221 are a ring, it is best to press the fixing ring 200 tightly during welding.

[0058] Understandably, the thickened portion 221 has a wedge-shaped cross-section, and at least one side abuts against the inner wall of the relief groove 171. The contact between the thickened portion 221 and the interior of the relief groove 171 can conduct heat to the pole post 100, further preventing weld penetration defects. The stepped portion 130 has at least two layers. The upper surface of the ring base 220 and the supporting surface of the step are both horizontal or have a certain slope to support and position the fixed ring 200 in the height direction. The lower surface of the ring base 220 is flush with the step surface of the lower step for welding.

[0059] Furthermore, multiple fixing grooves are provided on the upper surface of the substrate 400 along the outer periphery of the mounting hole 410, and multiple fixing posts that cooperate with the fixing grooves are provided below the fixing sleeve 160. Generally, the specific number of fixing grooves and fixing posts is 1-5, but more are also possible. The fixing posts and fixing grooves cooperate to form the anti-rotation structure of the fixing sleeve 160, preventing the fixing sleeve 160 and the pole post 100 from deflecting on the substrate 400, thus increasing the stability of the fixing assembly of the pole post 100 and the substrate 400. It should be noted that in some embodiments, as shown in Figure 1, the fixing sleeve 160 has a structure with a frustum on top and a square at the bottom. The frustum on top and the square structure on the bottom are integrally injection molded. During injection molding, in addition to forming the frustum on top to cover the pole post 100, the material simultaneously forms the square anti-rotation structure on the bottom, with fixing posts penetrating into the fixing grooves on the bottom surface of the anti-rotation structure. The fixing sleeve 160 can protect the pole post 100 and prevent accidental contact with the pole post 100 from causing a current risk.

[0060] It should be noted that the terminal post 100 and the mounting hole 410 are sealed together by a seal 500. The seal 500 seals the terminal post 100 and the mounting hole 410, improving the sealing performance of the cover plate, preventing air and liquid leakage, and improving battery safety.

[0061] In some embodiments of this application, as shown in FIG4, a transition portion 230 and an extension portion 240 are sequentially provided on the outer side of the ring base 220 of the fixing ring 200. The three are connected sequentially outside the ring opening 210 of the fixing ring 200 to form a stepped structure. The fixing ring 200 is engaged with the lower side of the mounting hole 410 through the extension portion 240. The ring opening 210 is sleeved on the outer side of the bottom end of the main body 170, which plays a role in positioning and installing the fixing ring 200 and the terminal post 100. The extension portion 240 is located on the lower side of the mounting hole 410, which reduces the space occupied outside the cover plate mounting hole 410, can compress the volume of the fixing ring 200, and further improve the utilization rate of the internal space of the battery. The transition portion 230 and the extension portion 240 contact and compress the sealing member 500, which can enhance the fixation of the sealing member 500 on the one hand, and compress the volume of the sealing member 500 to a certain extent on the other hand, thereby compressing the volume of the cover plate and reducing the space occupied under the cover plate.

[0062] Furthermore, as shown in Figure 6, the included angle between the transition portion 230 and the extension portion 240 is 85°≤β≤100°. The spacing between the ring base 220 and the extension portion 240 is varied according to the size of the included angle between the transition portion 230 and the extension portion 240. When the included angle β is acute or obtuse, assuming the ring base 220 and the extension portion 240 are parallel, the spacing between the parallel ring base 220 and the extension portion 240 is smaller than when the included angle β is right-angled. Therefore, the fixing ring 200 occupies less space in the longitudinal direction, making the fixing ring 200 appear flatter and improving the utilization rate of the battery's internal space.

[0063] It should be noted that, as shown in Figure 6, the distance between the top surface of the ring base 220 and the bottom surface of the extension 240 is Z ≥ 0.3 mm. The distance between the top surface of the ring base 220 and the bottom surface of the extension 240 determines the overall height of the fixing ring 200, which helps to reduce the space occupied by the fixing ring 200. At the same time, when the fixing ring 200 is a metal ring, its overall height can balance structural strength and current carrying capacity.

[0064] In some embodiments of this application, the top and bottom surfaces of the extension 240 are both planar structures. Furthermore, to enhance the limiting effect of the retaining ring 200 on the seal 500, the top surface of the extension 240 is a slope, which contacts the seal 500. The upper surface of the slope at the end furthest from the ring opening 210 is higher than the upper surface at the end closest to the ring opening 210. This sloped design of the extension 240 increases the compression of the seal 500, resulting in a tighter fit between the extension 240 and the seal 500. It also appropriately reduces the overall volume of both, increasing the sealing performance of the seal 500 while minimizing its size.

[0065] In some embodiments of this application, as shown in FIG3, a stepped portion 130 is provided at the end of the main body 170 of the electrode post 100 facing the battery cell, and an annular opening 210 is fitted onto the outside of the stepped portion 130; at least a portion of the top surface of the annular base 220 contacts the horizontal stepped surface of the stepped portion 130, and / or at least a portion of the end face of the annular base 220 contacts the vertical stepped surface of the stepped portion 130. The stepped portion 130 of the electrode post 100 facilitates the positioning of the annular opening 210 and the electrode post 100, and the stepped surface forms a recessed space that can accommodate the annular base 220, allowing the annular base 220 to overlap with the electrode post 100, thereby minimizing the space occupied by the fixing ring 200 on the cover plate and improving space utilization. Moreover, the stepped portion 130 can limit the fixing ring 200, improving structural stability. Partial or complete contact between the end face or top surface of the annular base 220 and the horizontal or vertical stepped surface of the stepped portion 130 allows for various assembly methods and can make reasonable use of the space under the cover plate.

[0066] In some embodiments, at least a portion of the top surface of the extension 240 contacts the seal 500, and / or at least a portion of the end face of the extension 240 contacts the seal 500. When the top surface or a portion of the top surface of the extension 240 contacts the seal 500, the extension 240 is horizontally positioned. When the end face or a portion of the end face of the extension 240 contacts the seal 500, the end face of the extension 240 is raised to contact the seal 500. When the top surface, a portion of the top surface, and the end face or a portion of the end face of the extension 240 contact the seal 500, the extension 240 is inclined. The extension 240 can compress the seal 500 to varying degrees, reasonably compressing the space under the cover and improving the sealing performance of the seal 500 to the cover. The extension 240's top surface or end face partially or completely contacts the seal 500, making reasonable use of the space under the cover, and the contact methods are diverse.

[0067] Understandably, the connector 300 is provided with a positioning center 310. The vertical projection of the positioning center 310 covers the geometric center point of the main body 170 near the end face of the battery cell. The positioning center 310 penetrates or partially penetrates the connector 300. The connector 300 is used to connect the tabs and terminals 100 inside the battery, thereby completing the conduction of current. The positioning center 310 can position the connector 300 when it is welded to the terminal 100, reducing welding errors.

[0068] In some embodiments, as shown in FIG7, an electrode groove 140 is provided at the outer end of the main body portion 170 of the electrode post 100. The electrode groove 140 can position the electrode post 100, which is beneficial for the welding process.

[0069] Furthermore, as shown in Figure 3, the electrode post 100 has a composite structure, comprising an aluminum composite part 110 and a copper composite part 120 connected together. This composite structure combines the excellent conductivity of copper with the lightweight and low-cost advantages of aluminum, improving the overall conductivity and reducing the cost of the electrode post 100. Moreover, through special processing techniques such as cold rolling and composite casting, the copper and aluminum are tightly bonded together to form a robust composite structure. This high bonding strength ensures that the electrode post 100 will not experience delamination or detachment during use, ensuring the stability and reliability of current transmission. A stepped portion 130 is located in the copper composite part 120, and a retaining ring 200 is connected to the copper composite part 120. The retaining ring 200 is a copper ring, simplifying the welding process for two components of the same material when welding to the copper composite part 120. It should be noted that welding is one method of electrical connection and is not limited to this method.

[0070] In some embodiments of this application, as shown in Figure 3, the sealing element 500 is a sealing ring, which includes a separately configured upper seal 510 and a lower seal 520. The upper seal 510 is disposed between the terminal post 100 and the substrate 400, and the lower seal 520 is located between the fixing ring 200 and the substrate 400. The sealing ring is elastic, providing insulation while improving the sealing performance of the cover. The sealing ring, divided into upper seal 510 and lower seal 520, can be embedded in different positions within the cover, improving the space utilization of the cover. Moreover, the upper seal 510 can provide additional protection for the lower seal 520; even when the sealing effect of the lower seal 520 is poor, the upper seal 510 can still provide good sealing performance for the cover, preventing the battery from leaking air from the cover. It should be noted that the longitudinal section of the ring body of both the upper seal 510 and the lower seal 520 is "L" shaped, and parts of the ring body of the upper seal 510 and the lower seal 520 are pre-installed in the mounting hole 410. As shown in Figure 3, a portion of the "L"-shaped upper seal 510 is located on the upper surface of the substrate 400, and the other portion extends into the mounting hole 410. A portion of the "L"-shaped lower seal 520 is located on the lower surface of the substrate 400, and the other portion extends into the mounting hole 410.

[0071] Understandably, a stop bracket 600 is connected to the bottom of the substrate 400. The stop bracket 600 is used to fix the battery cover plate, ensuring a tight fit between the cover plate and the battery casing, preventing displacement of the battery cover plate during battery use, thereby ensuring the structural stability and safety of the battery. The stop bracket 600 is provided with a relief groove, and the extension 240 extends into the location of the relief groove. The relief groove provides extension space for the extension 240, which can improve the utilization rate of the cover plate space and save internal battery space.

[0072] Another aspect of this application provides a battery including the aforementioned battery cover.

[0073] In the description of this invention, it should be noted that the terms "front," "rear," "left," "right," "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0074] In the description of this invention, 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 a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0075] The scope of protection of this invention is defined only by the claims. Thanks to the teachings of this invention, those skilled in the art will readily recognize that alternative structures to the structures disclosed herein can be used as feasible alternative implementations, and that the implementations disclosed herein can be combined to produce new implementations, which also fall within the scope of the appended claims.

Claims

1. A battery cover plate for sealing a battery housing, characterized by: include The substrate (400) has mounting holes (410); The pole post (100) includes a main body (170), the bottom end of which is at least partially located in a mounting hole (410); A retaining ring (200) is fitted onto the bottom end of the main body (170) and welded to the main body (170). The end face of the bottom end of the main body (170) is higher than the welding surface of the retaining ring (200) to prevent welding slag from falling onto the end face of the bottom end of the main body (170).

2. A battery cover plate for sealing a battery housing according to claim 1, characterized in that: include The substrate (400) has mounting holes (410); The pole piece (100) includes a main body (170) and an extension portion (150) connected together. The fixing sleeve (160) is sleeved on the extension portion (150) and fixed to the substrate (400). The bottom end of the main body (170) is at least partially located in the mounting hole (410). A retaining ring (200) is fitted onto the bottom end of the main body (170) and welded to the main body (170). The end face of the bottom end of the main body (170) is higher than the welding surface of the retaining ring (200) to prevent welding slag from falling onto the end face of the bottom end of the main body (170).

3. The battery cover plate of claim 2, wherein, The bottom end of the main body (170) tapers toward the center of the main body (170) to form a stepped portion (130), and the welding spot of the fixing ring (200) and the main body (170) surrounds the outer periphery of the stepped portion (130).

4. The battery cover plate of claim 3, wherein, The step portion (130) has at least one step, and the welding part of the fixing ring (200) and the main body portion (170) is fitted onto the second or higher step counted from the bottom end face of the main body portion (170).

5. The battery cover plate of claim 4, wherein, The outer radial direction of each step decreases layer by layer in the direction of the end face of the bottom of the main body (170).

6. The battery cover plate of claim 3, wherein, The center of the fixing ring (200) is the ring opening (210). The fixing ring (200) has at least one or one ring of thickened portions (221) on the ring base (220) near the ring opening (210). The main body (170) is provided with a relief groove (171) corresponding to the thickened portion (221).

7. A battery cover plate according to claim 6, wherein The thickened portion (221) has a wedge-shaped cross section, and at least one side abuts against the inner wall of the recessed groove (171).

8. A battery cover plate according to any one of claims 2-7, characterized in that The fixing ring (200) is provided with a transition portion (230) and an extension portion (240) on the outer side of the ring base (220), and the three are connected in sequence outside the ring opening (210) of the fixing ring (200) to form a stepped structure; the fixing ring (200) is locked on the lower side of the mounting hole (410) through the extension portion (240).

9. The battery cover plate of claim 6, wherein, The step portion (130) has at least two layers. The upper surface of the ring base portion (220) and the supporting surface of the step are both horizontal or have a certain slope. The lower surface of the ring base portion (220) is flush with the step surface of the lower step and is used for welding.

10. The battery cover plate of claim 8, wherein, The pole post (100) is a composite structure, including an aluminum composite part (110) and a copper composite part (120) connected to each other. The stepped part (130) is disposed on the copper composite part (120). The fixing ring (200) is a metal ring, and the metal ring is electrically connected to the copper composite part (120).

11. The battery cover plate of claim 8, wherein, The pole post (100) and the mounting hole (410) are sealed together by a sealing element (500).

12. The battery cover plate of claim 11, wherein, The sealing element (500) is a sealing ring, including a separate upper seal (510) and a lower seal (520); the upper seal (510) is disposed between the pole post (100) and the base plate (400), and the lower seal (520) is located between the fixing ring (200) and the base plate (400).

13. The battery cover plate of claim 12, wherein, Parts of the upper seal (510) and lower seal (520) rings are pre-installed in the mounting hole (410).

14. The battery cover plate of claim 2, wherein, The upper surface of the substrate (400) is provided with a plurality of fixing grooves along the outer periphery of the mounting hole (410), and the fixing sleeve (160) is provided with a plurality of fixing posts that cooperate with the fixing grooves below.

15. The battery cover plate of claim 8, wherein, The distance between the top surface of the ring base (220) and the bottom surface of the extension (240) is Z≥0.3mm.

16. The battery cover plate of claim 8, wherein, The included angle between the transition portion (230) and the extension portion (240) is 85°≤β≤100°.

17. The battery cover plate of claim 2, wherein, The main body (170) is used to install the connector (300) near the end face of the battery cell. The connector (300) is provided with a positioning center (310). The vertical projection of the positioning center (310) covers the geometric center point of the main body (170) near the end face of the battery cell. The positioning center (310) is provided through or partially through the connector (300).

18. The battery cover plate of claim 2, wherein, The outer end face of the main body (170) is provided with a pole groove (140).

19. The battery cover plate of claim 2, wherein, The bottom of the substrate (400) is connected to a stop frame (600), the stop frame (600) is provided with a relief groove, and the extension (240) extends toward the location of the relief groove.

20. A battery, characterized by Includes the battery cover as described in any one of claims 2-19.

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