Battery cover plate and battery

Abstract

The utility model discloses a battery cover plate and a battery, which belong to the technical field of batteries, are used for sealing a battery shell, and comprise 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; an extension part is arranged on the periphery of the fixing ring; the fixing ring is clamped on the lower side of the mounting hole through the extending part and arranged on the outer side of the bottom end of the main body part in a sleeving mode. According to the utility model, the fixing ring and the pole are used as an integral part which is firstly assembled together, and then the integral part is connected with the connecting piece, so that the production process can be optimized, and the assembly difficulty is reduced; in the production stage of the cover plate, no connecting piece is arranged on the pole, but the connecting piece is welded with the pole and the tab in the later production stage of the single battery, so that the problem of deformation of the connecting piece in the transfer stage of the cover plate does not need to be worried about.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field, specifically, relate to a battery cover plate and battery. BACKGROUND

[0002] Lithium ion battery generally by cover plate, positive and negative electrode pressing plate, positive and negative pole, up and down insulating pad and internal electric core are composed. Among them, the positive assembly, the negative assembly in realizing fixed, generally is through riveting and fixes each component in the terminal assembly together, and riveting fixed needs to use riveting mould, increased production cost.

[0003] Lithium ion battery internal space is very precious, the prior art generally compresses the space of cover plate to improve the internal space of battery. Such as the Chinese patent document with the announcement number CN210837817U discloses a kind of power battery top cover, adapter piece and power battery, the power battery top cover includes: top cover sheet, pole, upper plastic, adapter piece;Upper plastic is surrounded in pole;Top cover sheet is equipped with the installation recess with through hole in middle part, and the lower part of upper plastic is embedded in installation recess;Adapter piece is equipped with first welding portion, the connecting surface connected with the first welding portion transversely, the second welding portion and third welding portion respectively connected with the two ends of the connecting surface;The thickness of first welding portion is greater than second welding portion and third welding portion;First welding portion is connected with the bottom of pole.

[0004] Although the above-mentioned battery top cover reduces the space occupied by the connecting piece by bending the adapter piece, i.e. the structure of the connecting piece, the structure of the cover plate is complex, and the bending structure of the connecting piece makes the structure of the connecting piece complex. The pole and the connecting piece are welded and assembled together during the production of the cover plate, which has high assembly difficulty, and the cover plate assembled with the connecting piece needs to protect the shape of the connecting piece during transportation, which has high transportation difficulty. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of battery cover plate and battery, solve the problem of high assembly difficulty and high transportation difficulty that pole and connecting piece are welded and assembled together during the production of cover plate in prior art.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a kind of battery cover plate for sealing battery shell, including substrate, with mounting hole;Pole and fixed sleeve, the pole includes connected main body and outer extension, the fixed sleeve is sleeved on outer extension and is fixed on the upper side of substrate, the bottom end of main body is at least partially located in mounting hole;Fixed ring, outer periphery has extension;The fixed ring is clamped with mounting hole by extension, and is sleeved on the outside of the bottom end of main body.

[0007] By the above technical scheme, the extension part of the pole post is connected with the fixing sleeve, the fixing sleeve is fixed on the base plate, so that the pole post and the base plate are kept fixed. The fixing ring is clamped on the lower side of the mounting hole through the extension part, the extension part of the fixing ring does not need to occupy extra cover plate space, which is beneficial to improve the space utilization rate inside the battery. The fixing ring is sleeved outside the bottom end of the main body part, the fixing ring can be assembled together with the pole post as an integral part, the process is simple, the integral part is connected with the connecting piece, the production process can be optimized, and the assembly difficulty is reduced; and the connecting piece is not arranged on the pole post in the cover plate production stage, but is welded with the pole post and the pole lug in the production stage of the battery monomer in the later period, so that the deformation problem of the connecting piece does not need to be worried in the transfer stage of the cover plate.

[0008] Further, 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 are arranged below the fixing sleeve and matched with the fixing grooves.

[0009] The fixing columns of the fixing sleeve are matched with the fixing grooves of the base plate, forming a rotation stopping structure of the fixing sleeve, preventing the fixing sleeve and the pole post from being deflected on the base plate, and increasing the stability of the fixed assembly of the pole post and the base plate.

[0010] Further, the pole post and the mounting hole are sealingly connected through a sealing piece.

[0011] The sealing piece seals the pole post and the mounting hole, improves the sealing performance of the cover plate, prevents gas leakage and liquid leakage, and improves the safety of the battery.

[0012] Further, the fixing ring further comprises a ring-shaped ring base and a transition part, the ring base, the transition part and the extension part are sequentially connected from the inner side to the outer side of the fixing ring to form a stepped structure; the extension part is located on the lower side of the mounting hole, and the transition part and the extension part are in contact with and press the sealing piece.

[0013] The ring base is sleeved outside the bottom end of the main body part, and plays a positioning and mounting role of the fixing ring and the pole post. The ring base is located on the lower side of the mounting hole, reduces the space occupation outside the mounting hole of the cover plate, can compress the volume of the fixing ring, and further improves the utilization rate of the internal space of the battery. The transition part and the extension part are in contact with and press the sealing piece, which can enhance the fixation of the sealing piece on one hand, and can compress the volume of the sealing piece to a certain extent, so as to compress the volume of the cover plate and reduce the occupation of the space below the cover plate.

[0014] Further, the ring base is provided with a positioning column, the pole post is provided with a positioning groove corresponding to the position of the positioning column, and the positioning column is assembled with the positioning groove.

[0015] The positioning column and the positioning hole enable the fixing ring and the pole post to be positioned, when the fixing ring is a metal ring, the positions of the two do not deviate during welding, the welding seam is uniform and full, and gas leakage is prevented.

[0016] Further, the extension part is provided with a sealing protrusion, and the insulating part is provided with a sealing groove corresponding to the position of the sealing protrusion, and the sealing protrusion is embedded in the sealing groove.

[0017] The sealing protrusion and the sealing groove cooperate with each other to increase the sealing performance of the sealing part and further prevent the cover plate from leaking.

[0018] Further, the included angle between the transition part and the extension part is 85°≤β≤100°.

[0019] According to the size of the included angle between the transition part and the extension part, the spacing between the ring base and the extension part is changed. When the included angle is an acute angle or an obtuse angle, the spacing between the ring base and the extension part which are parallel to each other is smaller than when the included angle is a right angle, so that the fixed ring occupies less space in the longitudinal direction, the fixed ring appears more flat, and the utilization rate of the internal space of the battery can be improved.

[0020] Further, the spacing between the top surface of the ring base and the bottom surface of the extension part is Z≥0.3mm.

[0021] The spacing between the top surface of the ring base and the bottom surface of the extension part determines the overall height of the metal ring, which is beneficial to reduce the occupation of space, and also can take into account the structural strength of the fixed ring.

[0022] Further, the top surface of the extension part is a slope surface, the slope surface contacts the sealing part, and the upper surface of the end of the slope surface away from the ring opening is higher than the upper surface of the end of the slope surface close to the ring opening.

[0023] The slope surface design of the extension part can increase the compression of the sealing part, so that the extension part and the sealing part are combined more closely, and the overall volume of the two can also be appropriately reduced, which increases the sealing performance of the sealing part while reducing the volume.

[0024] Further, the end of the main body part of the pole towards the battery is provided with a stepped part, and the ring base is sleeved outside the stepped part; at least part of the top surface of the ring base contacts the horizontal stepped surface of the stepped part, and / or at least part of the end surface of the ring base contacts the vertical stepped surface of the stepped part.

[0025] The stepped part of the pole can facilitate the positioning of the ring base and the pole, and the stepped surface forms a retreat space to accommodate the ring base, so that the ring base overlaps the pole, thereby reducing the occupation of the space of the cover plate by the fixed ring as much as possible and improving the space utilization rate. Moreover, the stepped part can limit the fixed ring to improve the structural stability. Part or all of the end surface or the top surface of the ring base contacts the horizontal or vertical stepped surface of the stepped part, and the assembly mode is various, so that the space under the cover plate can be reasonably utilized.

[0026] Further, the extension part is at least partially in contact with the sealing element on the top surface, and / or the extension part is at least partially in contact with the sealing element on the end surface.

[0027] Through the above technical solution, the extension part can cause different degrees of compression to the sealing element, reasonably compress the space under the cover plate, and improve the sealing performance of the sealing element to the cover plate. Part or all of the top surface or end surface of the extension part is in contact with the sealing element, which reasonably utilizes the space under the cover plate and has various contact modes.

[0028] Further, the main body part of the pole is provided with a step part on the side facing the battery cell, and the step part has at least one layer. The outer diameter of the step part gradually decreases towards the side of the battery cell, and the end surface of the main body part close to the side of the battery cell is used to install the connecting piece.

[0029] The step part has at least one layer. When the step part has two or more layers, the outer diameter of the step part closer to the side of the battery cell is smaller, which can form a blocking structure. When the fixing ring is a metal ring, the metal ring is welded with the step part of the non-minimum outer diameter, and the step part of the minimum outer diameter can be used as a blocking structure to prevent welding spatter from splashing onto the end surface of the step part of the minimum outer diameter, i.e. to prevent welding spatter from splashing onto the end surface of the main body part close to the side of the battery cell, thereby avoiding interference with the installation of the connecting piece on the end surface of the main body part close to the side of the battery cell.

[0030] Further, the connecting piece is provided with a positioning core, and the vertical projection of the positioning core covers the geometric center point of the end surface of the main body part close to the side of the battery cell. The positioning core penetrates or partially penetrates the connecting piece.

[0031] The connecting piece is used to connect the tab inside the battery with the pole, thereby completing the conduction of current. The positioning core can position the connecting piece when the connecting piece is welded with the pole, thereby reducing welding errors.

[0032] Further, the outer side end of the main body part is provided with a pole groove.

[0033] The pole groove can position the pole, which is conducive to the welding process.

[0034] Further, the pole is a composite structure, including an aluminum composite part and a copper composite part connected together, the step part is arranged in the copper composite part, and the fixing ring is a metal ring, and the metal ring is electrically connected with the copper composite part. The composite pole combines the advantages of copper conductivity, aluminum lightweight, and low price. Moreover, through special processing techniques such as cold rolling and composite casting, copper and aluminum can be tightly combined together to form a firm composite structure. This high bonding strength ensures that the pole terminal will not delaminate or fall off during use, thereby ensuring the stability and reliability of current transmission. The metal ring is connected with the copper composite part, and the metal ring can be a copper ring. The welding process of two components made of the same material is simpler.

[0035] Further, the sealing member is a sealing ring, comprising an upper sealing and a lower sealing arranged separately.

[0036] The sealing ring has elasticity, and improves the sealing performance of the cover plate while providing insulation effect. The sealing ring is divided into an upper sealing and a lower sealing, and can be embedded in different positions of the cover plate, thereby improving the space utilization of the cover plate. The upper sealing can provide protection for the lower sealing, and when the sealing effect of the lower sealing is poor, the upper sealing can still provide good sealing performance for the cover plate to prevent the battery from leaking from the cover plate. The upper sealing and the lower sealing are pre-installed separately, which can reduce the assembly difficulty of the cover plate and ensure good sealing performance.

[0037] Further, the bottom of the base plate is connected with a stop frame, and the stop frame is provided with a retreat groove, and the extension part extends to the position of the retreat groove.

[0038] The stop frame is used for fixing the battery cover plate, ensuring the close fit between the cover plate and the battery shell, preventing displacement of the battery cover plate during use of the battery, and thereby ensuring the structural stability and safety of the battery. The retreat groove provides extension space for the extension part, which can improve the space utilization of the cover plate and save the internal space of the battery.

[0039] The utility model also provides a battery comprising the battery cover plate.

[0040] Compared with the prior art, the technical scheme has the following beneficial effects:

[0041] The battery cover plate comprises an extension part of a pole, a fixing sleeve, a base plate, a fixing ring, a main body part and a connecting piece. The extension part of the pole is connected with the fixing sleeve, and the fixing sleeve is fixed on the base plate, so that the pole and the base plate are kept fixed. The fixing ring is clamped on the lower side of the mounting hole through the extension part, and the extension part of the fixing ring does not need to occupy extra space of the cover plate, which is beneficial to improve the space utilization of the battery. The fixing ring is arranged on the outer side of the bottom end of the main body part. The fixing ring and the pole can be assembled together as a whole part, and the process is simple. The connecting piece is welded with the pole and the pole lug in the production stage of the battery monomer, so that the deformation of the connecting piece is avoided during the transportation of the cover plate.

[0042] Obviously, the elements or features described in the above single embodiment can be used alone or in combination in other embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0043] In the drawings, the dimensions and proportions of the various elements in the drawings are not necessarily to scale. The drawings are merely schematic and certain elements or features are omitted for clarity.

[0044] Figure 1 is a perspective view of the cover plate in the embodiment of the utility model;

[0045] Figure 2 is a top view of the cover plate in the embodiment of the utility model;

[0046] Figure 3 is Figure 2 the sectional view at A-A in figure

[0047] Figure 4 is Figure 3 the enlarged view at B in figure

[0048] Figure 5 is a structure schematic view of the positioning column of the metal ring in the embodiment of the utility model;

[0049] Figure 6 is a structure schematic view of the sealing protrusion of the metal ring in the embodiment of the utility model;

[0050] Figure 7 is a structure schematic view of the metal ring in the embodiment of the utility model;

[0051] Figure 8 is a structure schematic view of the cover plate (with pole slot) in the embodiment of the utility model;

[0052] Figure 9 is a structure schematic view of the pole in the embodiment of the utility model.

[0053] Explanation of reference signs

[0054] 100, pole; 110, aluminum composite part; 120, copper composite part; 130, step part; 131, water platform step surface; 132, vertical step surface; 140, pole slot; 150, extension part; 160, fixed sleeve; 170, main body part; 200, fixed ring; 210, ring mouth; 220, ring base part; 221, positioning column; 230, transition part; 240, extension part; 241, sealing protrusion; 300, connecting piece; 310, positioning core; 400, base plate; 410, mounting hole; 500, sealing piece; 510, upper sealing; 520, lower sealing; 600, stop frame. DETAILED DESCRIPTION

[0055] The utility model will be described in detail below with reference to the drawings. The description herein is only based on the preferred embodiments of the utility model, and other modes capable of realizing the utility model can be conceived by those skilled in the art on the basis of the preferred embodiments, and the other modes also fall within the scope of the utility model.

[0056] Embodiments

[0057] With reference to Figures 1-8 The embodiment provides a battery cover plate for sealing a battery housing, comprising a base plate 400 having a mounting hole 410; a pole 100 and a fixing sleeve 160, the pole 100 comprising a main body part 170 and an extension part 150 connected to each other, the fixing sleeve 160 being sleeved on the extension part 150 and fixed on the upper side of the base plate 400, and the bottom end of the main body part 170 being at least partially located in the mounting hole 410; a fixing ring 200 having an extension part 240 on the outer periphery; the fixing ring 200 is clamped with the mounting hole 410 through the extension part 240, and is sleeved on the outside of the bottom end of the main body part 170.

[0058] It can be understood that the extension part 150 of the pole 100 is connected with the fixing sleeve 160, and the fixing sleeve 160 is fixed on the base plate 400, so that the pole 100 and the base plate 400 are kept fixed. The fixing ring 200 is clamped on the lower side of the mounting hole 410 through the extension part 240, and the extension part 240 of the fixing ring 200 does not need to occupy extra cover plate space, which is beneficial to improve the space utilization rate of the battery. The fixing ring 200 is sleeved on the outside of the bottom end of the main body part 170, and the fixing ring 200 can be assembled together with the pole 100 as an integral part, the process is simple, the integral part is connected with the connecting piece 300, the production process can be optimized, and the assembly difficulty is reduced; and the connecting piece 300 is no longer arranged on the pole 100 in the cover plate production stage, but is welded with the pole 100 and the tab in the later production stage of the battery monomer, so that the deformation problem of the connecting piece 300 does not need to be worried in the transfer stage of the cover plate.

[0059] Furthermore, a plurality of fixing grooves are arranged on the upper surface of the base plate 400 along the outer periphery of the mounting hole 410, and a plurality of fixing columns matched with the fixing grooves are arranged below the fixing sleeve 160. Generally, the specific number of the plurality of fixing grooves and fixing columns is 1-5, and can be more. The fixing columns and the fixing grooves form a rotation-stopping structure of the fixing sleeve 160, preventing the fixing sleeve 160 and the pole 100 from deflecting on the base plate 400, and increasing the stability of the fixed assembly of the pole 100 and the base plate 400. It should be noted that in some embodiments, for example, Figure 1As shown, the fixing sleeve 160 is in a structure of a circular truncated cone on the top and a square on the bottom. The upper circular truncated cone and the lower square structure are integrally injection molded. During injection molding, the material not only covers the pole 100 to form the upper circular truncated cone structure, but also synchronously forms the lower square rotation-stopping structure. The bottom surface of the rotation-stopping structure has a fixing column penetrating into the fixing groove. The fixing sleeve 160 can protect the pole 100, preventing the risk of electric current caused by accidental contact with the pole 100.

[0060] It should be noted that the pole 100 and the mounting hole 410 are sealingly connected through the sealing member 500. The sealing member 500 seals the pole 100 and the mounting hole 410, improves the sealing performance of the cover plate, prevents gas and liquid leakage, and improves the safety of the battery.

[0061] In some embodiments of the present application, as shown in Figure 4 As shown, the fixing ring 200 includes a ring base 220, a transition part 230, and an extension part 240, which are sequentially connected from the inside to the outside of the ring opening 210 of the fixing ring 200 to form a stepped structure. The ring base 220 is sleeved on the outside of the bottom end of the main body part 170, and plays a positioning and mounting role of the fixing ring 200 and the pole 100. The extension part 240 is located on the lower side of the mounting hole 410, reduces the space occupation outside the mounting hole 410 of the cover plate, can compress the volume of the fixing ring 200, and further improves the utilization rate of the internal space of the battery. The transition part 230 and the extension part 240 are in contact with and extrude the sealing member 500, which can enhance the fixation of the sealing member 500 and compress the volume of the sealing member 500 to a certain extent, thereby compressing the volume of the cover plate and reducing the occupation of the space below the cover plate.

[0062] In some embodiments of the present application, as shown in Figure 5 As shown, the ring base 220 is provided with a positioning column 221, and the pole 100 is provided with a positioning groove corresponding to the position of the positioning column 221. The positioning column 221 is assembled with the positioning groove. The combination of the positioning column 221 and the positioning groove positions the fixing ring 200 and the pole 100. When the fixing ring 200 is a metal ring, the positions of the two do not deviate during welding, so that the welding seam is uniform and full, preventing the cover plate from leaking.

[0063] In some embodiments of the present application, as shown in Figure 6 As shown, the extension part 240 is provided with a sealing protrusion 241, and the sealing member 500 is provided with a sealing groove corresponding to the position of the sealing protrusion 241. The sealing protrusion 241 is embedded in the sealing groove. The sealing protrusion 241 and the sealing groove cooperate with each other to increase the sealing performance of the sealing member 500, further preventing the cover plate from leaking. It can be understood that the sealing member 500 is made of an elastic material at this time, and the sealing effect is better. The sealing protrusion 241 is arranged around the ring opening 210, and correspondingly, the sealing groove is a groove arranged around the sealing member 500.

[0064] Further, as shown in Figure 7 The angle between the transition portion 230 and the extension portion 240 is 85°≤β≤100°. According to the size of the angle between the transition portion 230 and the extension portion 240, the distance between the ring base 220 and the extension portion 240 is changed. When the angle β is an acute angle or an obtuse angle, the distance between the ring base 220 and the extension portion 240 which are parallel to each other is smaller when the angle β is a right angle, so that the fixed ring 200 occupies less space in the longitudinal direction, the fixed ring 200 appears more flat, and the utilization rate of the internal space of the battery can be improved.

[0065] It should be noted that, as shown in Figure 5 The distance between the top surface of the ring base 220 and the bottom surface of the extension portion 240 is Z≥0.3mm. The distance between the top surface of the ring base 220 and the bottom surface of the extension portion 240 determines the overall height of the fixed ring 200, which is beneficial to reduce the space occupied by the fixed ring 200. At the same time, when the fixed ring 200 is a metal ring, the overall height of the fixed ring 200 can take into account the structural strength and flow capacity of the fixed ring 200.

[0066] In some embodiments of the present application, the top surface and the bottom surface of the extension portion 240 are both planar structures. In addition, in order to improve the limiting effect of the fixed ring 200 on the sealing element 500, the top surface of the extension portion 240 is a slope surface, the slope surface contacts the sealing element 500, and the upper surface of the slope surface away from the one end of the ring opening 210 is higher than the upper surface of the slope surface close to the one end of the ring opening 210. The slope surface design of the extension portion 240 can increase the compression of the sealing element 500, so that the extension portion 240 and the sealing element 500 are combined more tightly, and the overall volume of the two can be appropriately reduced, which increases the sealing performance of the sealing element 500 while reducing the volume.

[0067] In some embodiments of the present application, as shown in Figure 4 and Figure 9As shown, the end of the main body 170 of the pole 100 facing the battery cell is provided with a stepped portion 130, and the ring mouth 210 is sleeved outside the stepped portion 130; the at least partial top surface of the ring base 220 is in contact with the horizontal stepped surface 131 of the stepped portion 130, and / or the at least partial end surface of the ring base 220 is in contact with the vertical stepped surface 132 of the stepped portion 130. The stepped portion 130 of the pole 100 can facilitate the positioning of the ring mouth 210 and the pole 100, and the stepped surface forms a retreat space that can accommodate the ring base 220, so that the ring base 220 overlaps the pole 100, thereby minimizing the occupation of the cover plate space by the fixing ring 200 and improving the space utilization. Moreover, the stepped portion 130 can limit the fixing ring 200 and improve the structural stability. The end surface or the top surface of the ring base 220 is partially or completely in contact with the horizontal or vertical stepped surface of the stepped portion 130, and the assembly mode is various, so that the space under the cover plate can be reasonably utilized.

[0068] In some embodiments, the extension 240 is in contact with the seal 500 at least partially on the top surface, and / or the extension 240 is in contact with the seal 500 at least partially on the end surface. When the top surface or part of the top surface of the extension 240 is in contact with the seal 500, the extension 240 is horizontally arranged. When the end surface or part of the end surface of the extension 240 is in contact with the seal 500, the end surface of the extension 240 is tilted and in contact with the seal 500. When the top surface, part of the top surface, and the end surface, part of the end surface of the extension 240 are in contact with the seal 500, the extension 240 is arranged obliquely. The extension 240 can compress the seal 500 to different degrees, reasonably compress the space under the cover plate, and improve the sealing performance of the seal 500 to the cover plate. The top surface or the end surface of the extension 240 is partially or completely in contact with the seal 500, and the space under the cover plate is reasonably utilized, and the contact mode is various.

[0069] In some embodiments, the main body 170 of the pole 100 is provided with a stepped portion 130 on the side facing the battery cell. The stepped portion 130 has at least one layer, and the outer diameter of the stepped portion 130 gradually decreases towards the side of the battery cell. The end surface of the main body 170 near the side of the battery cell is used to install the connecting piece 300. 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 near the side of the battery cell is smaller, and a blocking structure can be formed. When the fixing ring 200 is a metal ring, the metal ring is welded with the stepped portion 130 of the non-minimum outer diameter, and the stepped portion 130 of the minimum outer diameter can be used as a blocking structure to prevent welding spatter from splashing onto the end surface of the stepped portion 130 of the minimum outer diameter, i.e., to prevent welding spatter from splashing onto the end surface of the main body 170 near the side of the battery cell, thereby avoiding interference with the installation of the connecting piece 300 on the end surface of the main body 170 near the side of the battery cell. It can be understood that the connecting piece 300 is provided with a positioning core 310, and the positioning core 310 vertically projects to cover the geometric center point of the end surface of the main body 170 near the side of the battery cell. The positioning core 310 penetrates or partially penetrates the connecting piece 300. The connecting piece 300 is used to connect the tab inside the battery with the pole 100, thereby completing the conduction of current. The positioning core 310 can position the connecting piece 300 when the connecting piece 300 is welded with the pole 100, thereby reducing welding errors.

[0070] In some embodiments, as shown in Figure 8 The outer side end of the main body 170 of the pole 100 is provided with a pole groove 140, which can position the pole 100 and facilitate the welding process.

[0071] Further, as shown in Figure 4 The pole 100 is a composite structure, which includes an aluminum composite portion 110 and a copper composite portion 120 connected together. The composite structure combines the advantages of excellent electrical conductivity of copper and the advantages of lightweight and low cost of aluminum, thereby improving the overall electrical conductivity of the pole 100 and reducing the cost of the pole 100. Moreover, through special processing techniques such as cold rolling and composite casting, copper and aluminum can be tightly combined together to form a firm composite structure. This high bonding strength ensures that the pole 100 will not delaminate or fall off during use, thereby ensuring the stability and reliability of current transmission. The stepped portion 130 is arranged in the copper composite portion 120, and the fixing ring 200 is connected with the copper composite portion 120. The fixing ring 200 is a copper ring, and the welding process of two components of the same material is simpler when they are welded together. It should be noted that welding is one of the ways of electrical connection, and is not limited to this way.

[0072] In some embodiments of the present application, as shown in Figure 4As shown, the sealing member 500 is a sealing ring, which comprises an upper sealing ring 510 and a lower sealing ring 520 arranged separately. The upper sealing ring 510 is arranged between the pole 100 and the base plate 400, and the lower sealing ring 520 is arranged between the fixing ring 200 and the base plate 400. The sealing ring is elastic, which can provide insulation effect and improve the sealing performance of the cover plate. The sealing ring is divided into the upper sealing ring 510 and the lower sealing ring 520, which can be embedded in different positions of the cover plate, thereby improving the space utilization of the cover plate. Moreover, the upper sealing ring 510 can provide protection for the lower sealing ring 520. When the sealing effect of the lower sealing ring 520 is not good, the upper sealing ring 510 can still provide good sealing performance for the cover plate, thereby preventing the battery from leaking from the cover plate. It should be noted that the longitudinal section of the ring body of the upper sealing ring 510 and the lower sealing ring 520 is in the shape of "L". Part of the ring body of the upper sealing ring 510 and the lower sealing ring 520 is pre-installed in the mounting hole 410. Figure 4 As shown, part of the upper sealing ring 510 in the shape of "L" is located on the upper surface of the base plate 400, and the other part extends into the mounting hole 410. Part of the lower sealing ring 520 in the shape of "L" is located on the lower surface of the base plate 400, and the other part extends into the mounting hole 410.

[0073] It can be understood that the bottom of the base plate 400 is connected with a stop frame 600, which is used for fixing the battery cover plate and ensuring the close fit between the cover plate and the battery shell, thereby preventing the displacement of the battery cover plate during the use of the battery, and ensuring the structural stability and safety of the battery. The stop frame 600 is provided with a retreat groove, and the extension part 240 extends to the position of the retreat groove. The retreat groove provides the extension space of the extension part 240, which can improve the space utilization of the cover plate and save the internal space of the battery.

[0074] Another aspect of the present application provides a battery comprising the battery cover plate.

[0075] In the description of the present application, it should be noted that the terms "front", "back", "left", "right", "up", "down", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0076] In the description of the utility model, it is necessary to explain, unless another explicit provision and limitation, term "installation", "link", "connection" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through intermediate medium, can be two elements inside the communication.For ordinary skilled person in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0077] The protective scope of the utility model is limited by the claims only.Benefiting from the teaching of the utility model, the person skilled in the art can easily recognize that the alternative structure of the disclosed structure of the utility model can be used as a feasible alternative implementation, and the disclosed implementation of the utility model can be combined to produce a new implementation, which also falls within the scope of the appended claims.

Claims

1. A battery cover plate for sealing a battery housing, characterized by: The application relates to a battery pole fixing structure. The battery pole fixing structure comprises a substrate (400) with a mounting hole (410); a pole (100) comprising a connected main body (170) and an extension (150), and a fixing sleeve (160) sleeved on the extension (150) and fixed on the upper side of the substrate (400), wherein the bottom end of the main body (170) is at least partially located in the mounting hole (410); and a fixing ring (200) with an extension (240) on the outer periphery, wherein the fixing ring (200) is clamped with the mounting hole (410) through the extension (240) and is sleeved on the outside of the bottom end of the main body (170). The pole (100) and the mounting hole (410) are sealingly connected through a sealing element (500). The fixing ring (200) further comprises a ring base (220) and a transition (230), wherein the ring base (220), the transition (230) and the extension (240) are sequentially connected to form a stepped structure from the inner side to the outer side of the fixing ring (200); the extension (240) is located on the lower side of the mounting hole (410); and the transition (230) and the extension (240) are in contact with and press the sealing element (500).

2. The battery cover plate of claim 1, wherein, The main body (170) of the pole (100) is provided with a stepped portion (130) at the end facing the battery cell, the ring base (220) is sleeved on the outside of the stepped portion (130), the top surface of the ring base (220) is at least partially in contact with the water platform stepped surface (131) of the stepped portion (130), and / or the end surface of the ring base (220) is at least partially in contact with the vertical stepped surface (132) of the stepped portion (130).

3. The battery cover plate of claim 2, wherein, The top surface of the extension (240) is at least partially in contact with the sealing element (500), and / or the end surface of the extension (240) is at least partially in contact with the sealing element (500).

4. The battery cover plate of claim 3, wherein, The main body (170) of the pole (100) is provided with a stepped portion (130) at the side facing the battery cell, the stepped portion (130) is provided with at least one layer, and the outer diameter of the stepped portion (130) gradually decreases towards the side of the battery cell.

5. The battery cover plate of claim 3, wherein, The pole (100) is a composite structure comprising an aluminum composite portion (110) and a copper composite portion (120) connected to each other, the stepped portion (130) is arranged on the copper composite portion (120), and the fixing ring (200) is a metal ring electrically connected to the copper composite portion (120).

6. The battery cover plate of any one of claims 1-3, wherein, The sealing element (500) is a sealing ring comprising an upper sealing element (510) and a lower sealing element (520) arranged separately, the upper sealing element (510) is arranged between the pole (100) and the substrate (400), and the lower sealing element (520) is arranged between the fixing ring (200) and the substrate (400).

7. The battery cover plate of claim 4, wherein, Part of the ring body of the upper sealing element (510) and the lower sealing element (520) is pre-installed in the mounting hole (410).

8. The battery cover plate of claim 2, wherein, The distance between the top surface of the ring base (220) and the bottom surface of the extension (240) is Z>=0.3mm.

9. The battery cover plate of claim 8, wherein, The included angle between the transition (230) and the extension (240) is 85°<=beta<=100°.

10. The battery cover plate of claim 3, wherein, ​ 11. The battery cover plate of claim 3, wherein, ​ 12. The battery cover plate of claim 3, wherein, The top surface of the extension (240) is a slope surface, which is in contact with the sealing member (500), and the upper surface of the end of the slope surface away from the ring mouth (210) is higher than the upper surface of the end of the slope surface close to the ring mouth (210).

13. The battery cover plate of claim 3, wherein, The ring base (220) is provided with a positioning column (221), and the pole column (100) is provided with a positioning groove corresponding to the position of the positioning column (221), and the positioning column (221) is assembled with the positioning groove.

14. The battery cover plate of claim 3, wherein, The extension (240) is provided with a sealing protrusion (241), and the sealing member (500) is provided with a sealing groove corresponding to the position of the sealing protrusion (241), and the sealing protrusion (241) is embedded in the sealing groove.

15. The battery cover plate of claim 1, wherein, 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 the lower surface of the fixing sleeve (160) is provided with a plurality of fixing columns matched with the fixing grooves.

16. The battery cover plate of claim 1, wherein, The main body part (170) is close to the side end surface of the battery cell for mounting the connecting member (300), the connecting member (300) is provided with a positioning core (310), the vertical projection of the positioning core (310) covers the geometric center point of the end surface of the main body part (170) close to the battery cell, and the positioning core (310) penetrates or partially penetrates the connecting member (300).

17. The battery cover plate of claim 1, wherein, The outer side end surface of the main body part (170) is provided with a pole column groove (140).

18. The battery cover plate of claim 1, wherein, The bottom of the base plate (400) is connected with a stop frame (600), the stop frame (600) is provided with a retreat groove, and the extension (240) extends to the position of the retreat groove.

19. A battery, characterized by The battery cover plate comprises the battery cover plate according to any one of claims 1-18. The battery cover plate comprises the battery cover plate according to any one of claims 1-18.

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