Battery cover plate and battery

Abstract

The invention discloses a battery cover plate and a battery, and belongs to the technical field of batteries, the battery cover plate is used for sealing a battery shell, and the battery cover plate comprises a substrate with a mounting hole; the pole comprises a main body part and an extension part which are connected, the extension part is sleeved with the fixing sleeve, the fixing sleeve is fixed to the upper side of the substrate, and at least part of the bottom end of the main body part is located in the mounting hole; and the fixing ring is arranged at the bottom end of the main body part in a sleeving mode and welded to the main body part, and the end face of the bottom end of the main body part is higher than the welding face of the fixing ring and used for preventing welding slag from falling on the end face of the bottom end of the main body part. The end face of the bottom end of the main body part is higher than the bottom face of the fixing ring, when the fixing ring is a metal ring and welded to the main body part, welding slag can be blocked by the end face, higher than the welding face, of the main body part, the welding slag is prevented from being splashed to the end face of the main body part, the end face of the main body part is kept clean, and therefore connection with other parts is facilitated.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery cover and a battery. Background Art

[0002] Lithium-ion batteries are generally composed of a cover plate, positive and negative electrode pressure plates, positive and negative electrode posts, upper and lower insulating pads, and internal battery cells. When the positive and negative electrode assemblies are fixed, the components in the terminal assembly are generally fixed together by riveting, and riveting requires the use of riveting molds, which increases production costs.

[0003] The internal space of lithium-ion batteries is very valuable. In the prior art, the space of the cover plate is usually compressed to increase the internal space of the battery. For example, the Chinese patent document with the announcement number CN216980802U discloses a power battery top cover and a power battery, wherein the top cover includes an insulating plate, a top cover sheet, an upper plastic, a conductive block and a pole, wherein the conductive block is located in the upper plastic, the upper plastic is located above the top cover sheet, the insulating plate is arranged below the top cover sheet, the pole is located below the insulating plate, the insulating plate, the bottom of the top plastic are all provided with through holes, the upper surface protrusion of the pole is welded to the conductive block through the through holes of the insulating plate, the top cover sheet and the upper plastic from bottom to top to form an electronic channel, and the lower surface of the pole is in direct contact and communication with the current collector on the bare cell.

[0004] However, the positive conductive block and the positive electrode column of the above-mentioned battery top cover are welded together. The positive electrode column is annular in structure and welded at the end step of the positive conductive block. When welding the positive conductive block and the annular positive electrode column, welding slag will be generated. The welding slag may splash onto the end face of the positive conductive block, affecting the subsequent connection between the end face of the positive conductive block and other components. Summary of the invention

[0005] The object of the present invention is to provide a battery cover and a battery, so as to solve the problem in the prior art that the positive electrode conductive block of the battery top cover and the annular positive electrode column are welded together, welding slag is generated during welding of the positive electrode conductive block and the positive electrode column, and the welding slag may splash onto the end face of the positive electrode conductive block.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a battery cover plate for sealing a battery shell, comprising a substrate with a mounting hole; a pole and a fixing sleeve, wherein the pole comprises a main body portion and an extension portion connected to each other, the fixing sleeve is sleeved on the extension portion and fixed to the upper side of the substrate, and the bottom end of the main body portion is at least partially located in the mounting hole; a fixing ring, sleeved on the bottom end of the main body portion and welded to the main body portion, the end surface 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 on the end surface of the bottom end of the main body portion.

[0007] Through the above technical solution, the extension of the pole is connected to the fixed sleeve, and the fixed sleeve is fixed on the substrate, so that the pole and the substrate remain fixed. The fixed ring sleeve is arranged at the bottom end of the main body, and the fixed ring reduces the additional cover plate space, which is beneficial to improve the space utilization rate inside the battery. In addition, the end face of the bottom end of the main body is higher than the welding surface of the fixed ring. When the fixed ring is a metal ring and is welded to the main body, the welding slag will be blocked by the raised end face of the main body, avoiding the welding slag from splashing to the end face of the main body, keeping the end face of the main body clean and convenient for connection with other components.

[0008] Furthermore, the bottom end of the main body shrinks toward the center of the main body to form a step portion, and the welding spot between the fixing ring and the main body surrounds the outer periphery of the step portion.

[0009] The step portion can form a step surface that is convenient for positioning and installing the fixing ring, and the end surface of the step portion is higher than the welding surface of the fixing ring, thereby further improving the blocking of welding slag.

[0010] Furthermore, the step portion is provided with at least one step, and the outer diameter of each step decreases gradually toward the end face of the bottom end of the main body, and the welding portion between the fixing ring and the main body is sleeved on the second or higher step from the end face of the bottom end of the main body.

[0011] At least one layer of the step portion is provided. When the step portion is provided with two or more layers, the outer diameter of the step portion closer to the battery cell side is smaller, and a blocking structure can be formed. When the fixing ring is a metal ring, the metal ring is welded to the step portion of the non-minimum outer diameter, and the step portion of the minimum outer diameter can be used as a blocking structure to prevent welding slag from splashing onto the end face of the step portion of the minimum outer diameter, that is, to prevent welding slag from splashing onto the end face of the main body close to the battery cell side, thereby avoiding interference with the installation of other connectors on the end face of the main body close to the battery cell side.

[0012] Furthermore, the center of the fixing ring is a ring opening, and at least one place or one circle of thickened portion is provided on the ring base of the fixing ring close to the ring opening, and a avoidance groove corresponding to the thickened portion is provided on the main body.

[0013] In order to avoid the fixing ring occupying the internal space of the battery cell, it is generally set to be thinner. Thin metal sheets are prone to weld-through defects due to heat concentration during welding. The thickened part can conduct and store heat to reduce weld-through defects. When the thickened part is set at one or more places, the avoidance groove can also play a positioning role to avoid the movement of the fixing ring during welding and affect the welding quality. If the thickened part is a circle, it is best to press the fixing ring tightly during welding.

[0014] Furthermore, the cross section of the thickened portion is wedge-shaped, and at least one surface thereof abuts against the inner wall of the avoidance groove.

[0015] The thickened portion abuts against the inside of the avoidance groove and can conduct heat to the pole, further avoiding welding defects.

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

[0017] The ring sleeve is arranged outside the bottom end of the main body, and plays a role in positioning and installing the fixing ring and the pole. The fixing ring is clamped on the lower side of the mounting hole through the extension part, which reduces the space occupied outside the cover plate mounting hole, can compress the volume of the fixing ring, and further improve the utilization rate of the internal space of the battery.

[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 planes, and the lower surface of the ring base is flush with the step surface of the lower step for welding.

[0019] The step portion of the pole can facilitate the positioning of the ring mouth and the pole, and the step surface forms a retreat space that can accommodate the ring base, so that the ring base and the pole overlap, thereby minimizing the occupation of the cover space by the fixing ring and improving space utilization. In addition, the step portion can limit the fixing ring and improve the structural stability. The step portion has at least two layers, and the upper surface of the ring base and the supporting surface of the step are both horizontal planes to support and position 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 to each other, the step part is arranged on the copper composite part, and the fixing ring is a metal ring, and the metal ring is electrically connected to the copper composite part.

[0021] The composite pole combines the advantages of copper's conductivity and aluminum's light weight and low price. After special processing techniques such as cold rolling and composite casting, copper and aluminum can be tightly combined to form a strong composite structure. This high bonding strength ensures that the pole terminal will not have problems such as delamination and falling off during use, ensuring the stability and reliability of current transmission. The metal ring is connected to the copper composite part. The metal ring can be a copper ring, and the welding process of two parts of the same material is simpler.

[0022] Furthermore, the pole is sealed and connected to the mounting hole through a sealing member. The sealing ring is elastic, which improves the sealing performance of the cover plate while providing an insulating effect.

[0023] Furthermore, the sealing member is a sealing ring, comprising an upper seal and a lower seal which are separately arranged; the upper seal is arranged between the pole and the substrate, and the lower seal is located between the fixing ring and the substrate.

[0024] The sealing ring is divided into an upper seal and a lower seal, which can be embedded in different positions in the cover to improve the space utilization of the cover. In addition, the upper seal can provide additional protection for the lower seal. When the sealing effect of the lower seal is not good, the upper seal can still provide good sealing for the cover to prevent the battery from leaking from the cover.

[0025] Furthermore, parts of the upper seal and lower seal rings are pre-installed in the installation holes.

[0026] The upper seal and the lower seal are pre-installed separately, which can reduce the difficulty of assembling the cover plate, making it easy to assemble while ensuring good sealing.

[0027] Furthermore, a plurality of fixing grooves are arranged on the upper surface of the base plate along the outer periphery of the mounting hole, and a plurality of fixing columns matching with the fixing grooves are arranged below the fixing sleeve.

[0028] The multiple fixing posts of the fixing sleeve cooperate with the fixing grooves of the base plate to form a rotation-stopping structure of the fixing sleeve, thereby preventing the fixing sleeve and the pole from deflecting on the base plate and increasing the stability of the fixed assembly of the pole and the base plate.

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

[0030] The distance between the top surface of the ring base and the bottom surface of the extension portion determines the overall height of the metal ring, which is beneficial to reducing the space occupied and can also take into account the structural strength of the fixed ring.

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

[0032] According to the angle between the transition part and the extension part, the spacing between the ring base and the extension part is changed. When the angle is an acute angle or an obtuse angle, the spacing between the mutually parallel ring base and the extension part is smaller than when the angle is a right angle, so that the space occupied by the fixing ring in the longitudinal direction can be smaller, the fixing ring appears flatter, and the utilization rate of the internal space of the battery can be improved.

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

[0034] The connector is used to connect the internal lug and the pole of the battery to complete the conduction of current. The positioning core can position the connector when it is welded to the pole to reduce welding errors.

[0035] Furthermore, the outer end surface of the main body is provided with a pole slot, which can position the pole and is beneficial to the welding process.

[0036] Furthermore, a stop frame is connected to the bottom of the base plate, the stop frame is provided with a retreat groove, and the extension portion extends to the position of the retreat groove.

[0037] The stopper is used to fix the battery cover to ensure a tight fit between the cover and the battery housing, and prevent the battery cover from shifting during battery use, thereby ensuring the structural stability and safety of the battery. The setback groove provides an extension space for the extension part, which can improve the space utilization of the cover and save the internal space of the battery.

[0038] The present invention also provides a battery, comprising the above-mentioned battery cover.

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

[0040] A battery cover of the present invention has an extension of a pole connected to a fixing sleeve, and the fixing sleeve is fixed on a substrate, so that the pole and the substrate remain fixed. A fixing ring is provided at the bottom end of the main body, and the fixing ring reduces the additional cover space occupied, which is beneficial to improving the space utilization rate inside the battery. Moreover, the end surface of the bottom end of the main body is higher than the bottom 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 raised end surface of the main body, so as to prevent the welding slag from splashing onto the end surface of the main body, and keep the end surface of the main body clean so as to facilitate connection with other components.

[0041] It will be apparent that elements or features described above in the context of a single embodiment may be used alone or in combination in other embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In the drawings, the sizes and proportions do not represent the sizes and proportions of actual products. The drawings are merely illustrative, and some non-essential elements or features are omitted for clarity.

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

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

[0045] Figure 3 yes Figure 2 Sectional view at AA in the middle;

[0046] Figure 4 2 is a schematic diagram of a structure in which the end surface of the pole is higher than the bottom surface of the fixing ring in an embodiment of the present invention;

[0047] Figure 5 Schematic diagram of the structure of the step portion (two-layer steps) in an embodiment of the present invention;

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

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

[0050] Description of Reference Numerals

[0051] 100, pole; 110, aluminum composite part; 120, copper composite part; 130, step part; 140, pole slot; 150, extension part; 160, fixing sleeve; 170, main body; 171, avoidance groove; 200, fixing ring; 210, ring mouth; 220, ring base; 221, thickening part; 230, transition part; 240, extension part; 300, connector; 310, positioning center; 400, base plate; 410, mounting hole; 500, sealing member; 510, upper seal; 520, lower seal; 600, stop frame. DETAILED DESCRIPTION

[0052] The present invention will be described in detail below with reference to the accompanying drawings. What is described here is only a preferred embodiment of the present invention, and those skilled in the art can think of other ways to implement the present invention based on the preferred embodiment, and other ways also fall within the scope of the present invention.

[0053] Example

[0054] Reference Figure 1-Figure 7 The present embodiment provides a battery cover for sealing a battery housing, including a substrate 400 having a mounting hole 410; a pole 100 and a fixing sleeve 160, wherein the pole 100 includes a main body 170 and an extension 150 connected to each other, the fixing sleeve 160 is sleeved on the extension 150 and fixed on the upper side of the substrate 400, and the bottom end of the main body 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 170 and welded to the main body 170, and the end surface of the bottom end of the main body 170 is higher than the welding surface of the fixing ring 200, so as to prevent welding slag from falling on the end surface of the bottom end of the main body 170.

[0055] It is understandable that the extension 150 of the pole 100 is connected to the fixing sleeve 160, and the fixing sleeve 160 is fixed on the substrate 400, so that the pole 100 and the substrate 400 remain fixed. The fixing ring 200 is sleeved on the bottom end of the main body 170, and the fixing ring 200 reduces the additional cover plate space, which is conducive to improving the space utilization rate inside the battery. In addition, the end face of the bottom end of the main body 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 170, the welding slag will be blocked by the end face of the main body 170 that is higher than the welding surface, so as to avoid the welding slag from splashing to the end face of the main body 170, and keep the end face of the main body 170 clean so as to facilitate connection with other components. It should be noted that in addition to the end face of the main body 170 being higher, the welding position of the welding ring 200 can also be made lower, so as to achieve the end face of the bottom end of the main body 170 being higher than the welding surface of the main body 170 and the fixing ring 200.

[0056] Furthermore, Figure 3 and Figure 4 As shown, the bottom end of the main body 170 shrinks toward the center of the main body 170 to form a step portion 130, and the welding spot between the fixing ring 200 and the main body 170 surrounds the outer periphery of the step portion 130. The step portion 130 can form a step surface that facilitates the positioning and installation of the fixing ring 200, and the end surface of the step portion 130 is higher than the welding surface of the fixing ring 200, further improving the blocking of welding slag.

[0057] In some embodiments, Figure 5 As shown, the step portion 130 is provided with at least one step, and the outer diameter of each step decreases layer by layer toward the end surface of the bottom end of the main body 170, and the welding part between the fixing ring 200 and the main body 170 is sleeved on the second or higher step from the bottom end surface of the main body 170. It can be understood that the higher layer is the third and higher steps from the bottom end surface of the main body 170. The step portion 130 is provided with at least one layer. When the step portion 130 is two or more layers, the outer diameter of the step portion 130 closer to the battery cell side is smaller, and a blocking structure can be formed. When the fixing ring 200 is a metal ring, the metal ring is welded to the step portion 130 of non-minimum outer diameter, and the step portion 130 of minimum outer diameter can be used as a blocking structure to prevent welding slag from splashing to the end surface of the step portion 130 of minimum outer diameter, that is, to prevent welding slag from splashing to the end surface of the main body 170 close to the battery cell side, thereby avoiding interference with the installation of other connecting components close to the end surface of the main body 170 close to the battery cell side.

[0058] In some embodiments, Figure 4As shown, the center of the fixing ring 200 is the ring opening 210, and at least one or one circle of thickened portions 221 are provided on the ring base 220 of the fixing ring 200 near the ring opening 210, and a position avoidance groove 171 corresponding to the thickened portion 221 is provided on the main body 170. In order to avoid the fixing ring 200 occupying the internal space of the battery cell, it is generally set to be thinner. Thin metal sheets are prone to heat concentration welding defects during welding. The thickened portion 221 can conduct and store heat to reduce welding defects; when the thickened portion 221 is set at one or more places, the position avoidance groove 171 can also play a positioning role to avoid the movement of the fixing ring 200 during welding and affect the welding quality; if the thickened portion 221 is a circle, it is best to press the fixing ring 200 during welding.

[0059] It is understandable that the cross section of the thickened portion 221 is wedge-shaped, and at least one side abuts against the inner wall of the avoidance groove 171. The thickened portion 221 abuts against the inside of the avoidance groove 171 to conduct heat to the pole 100, further avoiding welding defects. The step portion 130 has at least two layers, and 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 height direction of the fixing ring 200. The lower surface of the ring base 220 is flush with the step surface of the lower step for welding.

[0060] Furthermore, a plurality of fixing grooves are provided on the upper surface of the substrate 400 along the periphery of the mounting hole 410, and a plurality of fixing posts cooperating with the fixing grooves are provided below the fixing sleeve 160. Generally, the specific number of “multiple” fixing grooves and fixed portions is 1-5, or more. The fixing posts cooperate with the fixing grooves to form a rotation-stopping structure of the fixing sleeve 160, thereby preventing the fixing sleeve 160 and the pole 100 from deflecting on the substrate 400, and increasing the stability of the fixed assembly of the pole 100 and the substrate 400. It should be noted that in some embodiments, such as Figure 1 As shown, the fixing sleeve 160 is a structure with a truncated cone on the top and a square structure on the bottom. The truncated cone on the top and the square structure on the bottom are integrally injection molded. During the injection molding, the material not only forms the truncated cone structure on the top to cover the pole 100, but also forms the square anti-rotation structure on the bottom. The bottom surface of the anti-rotation structure has a fixing column that penetrates into the fixing groove. The fixing sleeve 160 can protect the pole 100 to prevent the risk of current generated by accidentally touching the pole 100.

[0061] It should be noted that the pole 100 and the mounting hole 410 are sealed and connected by a seal 500. The seal 500 seals the pole 100 and the mounting hole 410, improves the sealing performance of the cover plate, prevents gas leakage and liquid leakage, and improves the safety of the battery.

[0062] In some embodiments of the present application, Figure 4As shown, the outer side of the ring base 220 of the fixing ring 200 is also provided with a transition part 230 and an extension part 240 in sequence, and the three are sequentially connected outside the ring opening 210 of the fixing ring 200 to form a stepped structure, and the fixing ring 200 is clamped on the lower side of the mounting hole 410 through the extension part 240. Among them, 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 pole 100. The extension part 240 is located on the lower side of the mounting hole 410, reducing the space occupied outside the cover plate mounting hole 410, which can compress the volume of the fixing ring 200 and further improve the utilization rate of the internal space of the battery. The transition part 230 and the extension part 240 contact and squeeze the seal 500, which can enhance the fixation of the seal 500 on the one hand, and compress the volume of the seal 500 to a certain extent on the other hand, thereby compressing the volume of the cover plate and reducing the occupation of the space under the cover plate.

[0063] Furthermore, Figure 6 As shown, the 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 changed according to the angle between the transition portion 230 and the extension portion 240. When the angle β is an acute angle or an obtuse angle, the spacing between the ring base 220 and the extension portion 240, which are parallel to each other, is smaller than when the angle β is a right angle, so that the space occupied by the fixing ring 200 in the longitudinal direction is smaller, the fixing ring 200 appears flatter, and the utilization rate of the internal space of the battery can be improved.

[0064] It should be noted that if Figure 6 As shown, 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 is beneficial to reducing the space occupied by the fixing ring 200. At the same time, when the fixing ring 200 is a metal ring, the overall height of the fixing ring 200 can take into account the structural strength and flow capacity of the fixing ring 200.

[0065] In some embodiments of the present application, the top and bottom surfaces of the extension 240 are both planar structures. In addition, in order to improve the limiting effect of the fixing ring 200 on the seal 500, the top surface of the extension 240 is a slope, the slope is in contact with the seal 500, and the upper surface of the slope away from the ring opening 210 is higher than the upper surface of the slope close to the ring opening 210. The slope design of the extension 240 can increase the compression of the seal 500, so that the extension 240 and the seal 500 are more tightly combined, and the overall volume of the two can also be appropriately reduced, thereby increasing the sealing performance of the seal 500 while reducing the volume.

[0066] In some embodiments of the present application, Figure 3As shown, the end of the main body 170 of the pole 100 facing the battery core is provided with a step portion 130, and the ring mouth 210 is sleeved on the outside of the step portion 130; at least part of the top surface of the ring base 220 contacts the horizontal step surface of the step portion 130, and / or at least part of the end surface of the ring base 220 contacts the vertical step surface of the step portion 130. The step portion 130 of the pole 100 can facilitate the positioning of the ring mouth 210 and the pole 100, and the step surface forms a concession space that can accommodate the ring base 220, so that the ring base 220 overlaps with the pole 100, thereby minimizing the occupation of the cover space by the fixing ring 200 and improving the space utilization. In addition, the step portion 130 can limit the fixing ring 200 to improve the structural stability. Part or all of the end surface or top surface of the ring base 220 contacts the horizontal or vertical step surface of the step portion 130, and the assembly method is diverse, and the space under the cover can be reasonably utilized.

[0067] In some embodiments, at least part of the top surface of the extension 240 contacts the seal 500, and / or at least part of the end surface of the extension 240 contacts the seal 500. When the top surface or part of the top surface of the extension 240 contacts the seal 500, the extension 240 is arranged horizontally. When the end surface or part of the end surface of the extension 240 contacts the seal 500, the end surface of the extension 240 is tilted and contacts the seal 500. When the top surface, part of the top surface and the end surface, and part of the end surface of the extension 240 contact the seal 500, the extension 240 is arranged tilted. The extension 240 can cause different degrees of compression to the seal 500, reasonably compress the space under the cover plate, and improve the sealing performance of the seal 500 to the cover plate. Part or all of the top surface or end surface of the extension 240 contacts the seal 500, reasonably utilizes the space under the cover plate, and has various contact methods.

[0068] It is understandable that the connector 300 is provided with a positioning core 310, the positioning core 310 vertically projects and covers the geometric center point of the main body 170 near the end face of the battery cell, and the positioning core 310 penetrates or partially penetrates the connector 300. The connector 300 is used to connect the pole ear and the pole 100 inside the battery, thereby completing the conduction of current. The positioning core 310 can position the connector 300 when the connector 300 is welded to the pole 100, thereby reducing welding errors.

[0069] In some embodiments, Figure 7 As shown, the outer end of the main body 170 of the pole 100 is provided with a pole groove 140 , and the pole groove 140 can position the pole 100 , which is beneficial to the welding process.

[0070] Furthermore, Figure 3As shown, the pole 100 is a composite structure, and the pole 100 includes an aluminum composite part 110 and a copper composite part 120 connected to each other. The composite structure combines the advantages of copper's excellent conductivity and aluminum's lightweight and low cost, which improves the overall conductivity of the pole 100 and reduces the cost of the pole 100. Moreover, after special processing techniques, such as cold rolling, composite casting, etc., copper and aluminum can be tightly combined to form a strong composite structure. This high bonding strength ensures that the pole 100 will not have problems such as delamination and falling off during use, ensuring the stability and reliability of current transmission. The step portion 130 is arranged on the copper composite part 120, and the fixing ring 200 is connected to the copper composite part 120. The fixing ring 200 is a copper ring. When welding with the copper composite part 120, the welding process of two parts of the same material is simpler. It should be noted that welding is one of the ways of electrical connection, and is not limited to this method.

[0071] In some embodiments of the present application, Figure 3 As shown, the seal 500 is a sealing ring, and the sealing ring includes an upper seal 510 and a lower seal 520 which are separately arranged. The upper seal 510 is arranged between the pole 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, which improves the sealing of the cover while providing insulation effect. The sealing ring is divided into an upper seal 510 and a lower seal 520, which can be embedded in different positions in the cover to improve the space utilization rate of the cover. In addition, the upper seal 510 can provide additional protection for the lower seal 520. When the sealing effect of the lower seal 520 is not good, the upper seal 510 can still provide good sealing for the cover to prevent the battery from leaking from the cover. It should be noted that the longitudinal sections of the ring bodies of the upper seal 510 and the lower seal 520 are both "L"-shaped, and part of the ring bodies of the upper seal 510 and the lower seal 520 are pre-installed in the mounting hole 410. As shown Figure 3 As shown, a portion of the L-shaped upper seal 510 is located on the upper surface of the substrate 400 and another 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 another portion extends into the mounting hole 410.

[0072] It is understandable that the bottom of the substrate 400 is connected with a stop frame 600, which is used to fix the battery cover to ensure a close fit between the cover and the battery housing, and prevent the battery cover from shifting during the use of the battery, thereby ensuring the structural stability and safety of the battery. The stop frame 600 is provided with a retreat groove, and the extension 240 extends to the position of the retreat groove. The retreat groove provides an extension space for the extension 240, which can improve the space utilization of the cover and save the internal space of the battery.

[0073] Another aspect of the present application provides a battery, comprising the above-mentioned battery cover.

[0074] In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "front", "rear", "left", "right", "up", "down", "top", "bottom", "inside", "outside", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0075] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0076] The protection scope of the present invention is limited only by the claims. With the help of the teachings of the present invention, those skilled in the art will easily recognize that alternative structures of the structures disclosed in the present invention can be used as feasible alternative embodiments, and the embodiments disclosed in the present invention can be combined to generate new embodiments, which also fall within the scope of the appended claims.

Claims

1. A battery cover for sealing a battery housing, characterized in that: include A base plate (400) having a mounting hole (410); A pole (100) and a fixing sleeve (160), wherein the pole (100) comprises a main body (170) and an extension (150) connected to each other, and the fixing sleeve (160) is sleeved on the extension (150) and fixed to a substrate (400); the bottom end of the main body (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 (170) and is welded to the main body (170); the end surface of the bottom end of the main body (170) is higher than the welding surface of the fixing ring (200) to prevent welding slag from falling on the end surface of the bottom end of the main body (170).

2. A battery cover according to claim 1, characterized in that: The bottom end of the main body (170) shrinks toward the center of the main body (170) to form a step portion (130), and the welding spot between the fixing ring (200) and the main body (170) surrounds the outer periphery of the step portion (130).

3. A battery cover according to claim 2, characterized in that: The step portion (130) is provided with at least one step, and the welding portion between the fixing ring (200) and the main body (170) is sleeved on the second or higher step from the bottom end surface of the main body (170).

4. A battery cover according to claim 3, characterized in that: The end surface direction of the bottom end of the outer radial main body part (170) of each layer of steps decreases layer by layer.

5. A battery cover according to claim 2, characterized in that: The center of the fixing ring (200) is a ring opening (210), and at least one place or one circle of thickened portion (221) is provided on the ring base (220) of the fixing ring (200) close to the ring opening (210), and the main body (170) is provided with a avoidance groove (171) corresponding to the thickened portion (221).

6. A battery cover according to claim 5, characterized in that: The cross section of the thickened portion (221) is wedge-shaped, and at least one surface thereof abuts against the inner wall of the avoidance groove (171).

7. A battery cover according to any one of claims 1 to 6, characterized in that: The outer side of the ring base (220) of the fixing ring (200) is also provided with a transition portion (230) and an extension portion (240) in sequence, and the three are sequentially connected outside the ring opening (210) of the fixing ring (200) to form a stepped structure; the fixing ring (200) is clamped on the lower side of the mounting hole (410) through the extension portion (240).

8. A battery cover according to claim 5, characterized in that: The step 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, and the lower surface of the ring base (220) is flush with the step surface of the lower step for welding.

9. A battery cover according to claim 7, characterized in that: The pole (100) is a composite structure, comprising an aluminum composite part (110) and a copper composite part (120) connected to each other, the step part (130) is arranged on the copper composite part (120), and the fixing ring (200) is a metal ring, which is electrically connected to the copper composite part (120).

10. A battery cover according to claim 7, characterized in that: The pole (100) is sealed and connected to the mounting hole (410) via a sealing member (500).

11. A battery cover according to claim 10, characterized in that: The sealing member (500) is a sealing ring, comprising an upper seal (510) and a lower seal (520) which are separately arranged; the upper seal (510) is arranged between the pole (100) and the substrate (400), and the lower seal (520) is located between the fixing ring (200) and the substrate (400).

12. A battery cover according to claim 11, characterized in that: Part of the ring bodies of the upper seal (510) and the lower seal (520) are pre-installed in the installation hole (410).

13. The battery cover according to claim 1, characterized in that: The upper surface of the base plate (400) is provided with a plurality of fixing grooves along the outer periphery of the mounting hole (410), and a plurality of fixing columns matching the fixing grooves are provided below the fixing sleeve (160).

14. A battery cover according to claim 7, characterized in that: The distance between the top surface of the ring base (220) and the bottom surface of the extension portion (240) is Z≥0.3 mm.

15. The battery cover according to claim 7, characterized in that: The included angle between the transition portion (230) and the extension portion (240) is 85°≤β≤100°.

16. A battery cover according to claim 1, characterized in that: The main body (170) is close to the side end face of the battery cell for installing a connector (300), and the connector (300) is provided with a positioning core (310), and the vertical projection of the positioning core (310) covers the geometric center point of the main body (170) close to the end face of the battery cell, and the positioning core (310) is arranged to penetrate or partially penetrate the connector (300).

17. A battery cover according to claim 1, characterized in that: The outer end surface of the main body (170) is provided with a pole slot (140).

18. The battery cover according to claim 1, characterized in that: The bottom of the base plate (400) is connected to a stop frame (600), the stop frame (600) is provided with a retreat groove, and the extension portion (240) extends to the location of the retreat groove.

19. A battery, characterized in that: A battery cover comprising the battery cover according to any one of claims 1 to 18.

Images