CN219739108U - Battery post mounting structure and secondary battery - Google Patents

Abstract

The utility model provides a battery pole mounting structure and a secondary battery, wherein the battery pole mounting structure comprises: a housing having an end surface formed with a mounting hole; the pole comprises a pole body which is arranged in the mounting hole and the upper end of which is exposed; the first fixing ring extends outwards from the pole body to form a first overlapping part, and the planar projection overlaps with part of the end face on the outer periphery side of the mounting hole, and the first overlapping part is arranged above the end face; the second fixing ring is provided with a second overlapping part, the plane projection of which is partially overlapped with the first overlapping part, and the inner periphery of the second fixing ring is arranged above the first overlapping part, and the outer periphery of the second fixing ring is fixedly connected with the end face of the shell; and the insulating part is filled in gaps formed among the first fixed ring, the pole body, the second fixed ring and the shell. The first and second fixing rings are used for fixing the pole, so that the welding and sealing of the pole are facilitated, and the structural strength and fatigue resistance of the pole are improved; and the assembly process is simplified, and the efficiency is higher.

Description

Battery post mounting structure and secondary battery

Technical Field

Embodiments of the present disclosure relate generally to the field of battery technology, and more particularly, to a battery post mounting structure and a secondary battery.

Background

In the field of automobiles, the development of new energy electric automobiles becomes a great development trend. The core power source of the electric automobile is a power battery, namely a secondary battery, so the performance of the power battery is particularly important. The power battery is morphologically mainly divided into a square battery, a soft pack battery and a cylindrical battery. The cylindrical battery pole has different structures and packaging forms, the corresponding batteries have different structural strength and performance, and the manufacturing cost is also different.

In the prior art, the positive electrode of the cylindrical battery is mostly insulated and sealed by adopting a roll-sealing process or a positive electrode post riveting or injection molding mode.

However, the cylindrical battery adopts a roll-sealing process, and the structural strength meets the requirement, but the space utilization rate is low, so that the improvement of the energy density of the battery core is not facilitated. The structural strength may be low by insulating sealing by riveting or injection molding, and the production efficiency of injection molding is low. The corresponding manufacturing costs are relatively high, whether by processes such as seaming or injection molding.

Disclosure of Invention

According to the embodiment of the disclosure, a battery pole mounting structure and a battery are provided, and the structural strength and the mounting stability of a battery pole part are improved, and the efficiency is higher, and the manufacturing cost is low.

In a first aspect of the present disclosure, there is provided a battery post mounting structure comprising: a housing having an end surface formed with a mounting hole; a post including a post body provided in the mounting hole with an upper end exposed from the mounting hole; a first fixing ring extending from an outer peripheral surface of the pole body to an outer peripheral side, wherein a planar projection overlaps at least a part of the end surface on the outer peripheral side of the mounting hole to form a first overlapping portion, and the first overlapping portion is disposed above the end surface; a second fixing ring having an inner peripheral portion provided above the first overlapping portion, a second overlapping portion overlapping at least a part of the first overlapping portion in plan view, and an outer peripheral portion connected and fixed to an end face of the housing; and the insulating part is filled in gaps formed between the first fixing ring, the pole body, the second fixing ring and the shell.

In the battery post mounting structure according to the present utility model, it is preferable that the first fixing ring be provided with a first offset portion that is located closer to the lower end side of the post during the process of extending from the circumferential inner side to the circumferential outer side.

In the battery post mounting structure according to the present utility model, preferably, the second fixing ring is provided with a second biasing portion that is located closer to the upper end side of the post during the process of extending from the circumferential outer side to the circumferential inner side.

In the battery post mounting structure of the present utility model, preferably, the end surface is provided with a recess portion that biases the mounting hole to the lower side of the case.

In the battery post mounting structure of the present utility model, preferably, the insulating portion includes a first insulating member that covers an outer peripheral surface of the base portion of the post body at the base portion of the post body so as to insulate between the base portion of the post body and the mounting hole; a second insulating member extending from an inner peripheral side of the mounting hole to an outer peripheral side of the first overlapping portion along a gap between the end face of the outer peripheral side of the mounting hole and the first overlapping portion to insulate between the first fixing ring and the housing; and a third insulating member extending along a gap between the first and second fixing rings to an inner peripheral side of the second fixing ring and covering an outer peripheral surface of the first fixing ring to insulate the first and second fixing rings from each other.

In the battery post mounting structure according to the present utility model, preferably, a connection piece is provided at a lower end of the post body, the connection piece is integrally formed with the post body, and the first insulating member extends circumferentially outward along a gap between the connection piece and the case, and covers an upper surface of the connection piece.

In the battery post mounting structure of the present utility model, preferably, the post body and the connecting piece are integrally formed by punching or welding.

In the battery post mounting structure according to the present utility model, preferably, an upper convex annular portion extending upward from an upper surface of the end surface is formed on an outer peripheral portion of the second insulating member; a main body portion of the second insulating member extending from a lower end of the upper convex annular portion toward an inner peripheral side of the mounting hole along a gap between an upper surface of the end face and the first overlapping portion;

a lower convex annular portion is formed on the inner peripheral portion of the second insulating member, extending downward from the inner peripheral portion of the main body portion along the inner peripheral surface of the mounting hole, and interposed between the outer peripheral surface of the first insulating member and the inner peripheral surface of the mounting hole.

In the battery post mounting structure according to the present utility model, preferably, the upper end outer peripheral surface of the post body is formed with a stepped portion that is lowered in height from the inner peripheral side to the outer peripheral side, and the first fixing ring is fitted to the stepped portion on the inner peripheral side.

In the battery post mounting structure of the present utility model, preferably, the first fixing ring and the post body are made of the same metal material, and are welded and fixed; the second fixing ring and the shell are made of the same metal material and are fixed by welding.

Preferably, in the battery post mounting structure of the present utility model, the second insulating member is made of a rubber material; the first insulating part and the third insulating part are made of plastic materials.

In addition, the utility model also provides a secondary battery, at least any electrode comprises the battery pole mounting structure.

The utility model has the beneficial effects that the pole is fixed by utilizing the mode that the first fixing ring and the second fixing ring are respectively connected with the pole and the shell and overlapped, on one hand, the welding and sealing of the pole are facilitated, and the structural strength and fatigue resistance of the pole part are improved; on the other hand, the assembly process is simplified, and the efficiency is higher.

It should be understood that what is described in this summary is not intended to limit the critical or essential features of the embodiments of the disclosure nor is it intended to limit the scope of the disclosure. Other features of the present disclosure will become apparent from the following description.

Drawings

The above and other features, advantages and aspects of embodiments of the present disclosure will become more apparent by reference to the following detailed description when taken in conjunction with the accompanying drawings. In the drawings, wherein like or similar reference numerals denote like or similar elements, in which:

fig. 1 is an external view of a secondary battery according to a preferred embodiment of the present utility model;

fig. 2 is a view of the secondary battery according to the preferred embodiment of the present utility model, as seen from the direction of the post;

FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;

fig. 4 is an exploded view of a terminal mounting structure of a secondary battery according to a preferred embodiment of the present utility model;

fig. 5 is an enlarged partial view of the cross-sectional view shown in fig. 3.

Wherein, the correspondence between the reference numerals and the component names in fig. 1 to 5 is:

a 100-shell; 111 mounting holes, 112 recesses;

200 electrode portions (positive electrode portions);

210 pole, 211 pole body, 212 connecting piece, 213 step;

220 a first fixing ring, 221 a first overlapping portion, 222 a first bending portion;

230 a second fixing ring, 231 a second overlapping portion, 232 a second bending portion;

240 insulating part, 241 first insulating part, 242 second insulating part, 243 third insulating part;

2421 an upper convex annular portion, 2422 a main body portion, 2423 a lower convex annular portion;

300 negative electrode portion.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are some embodiments of the present disclosure, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without inventive effort, based on the embodiments in this disclosure are intended to be within the scope of this disclosure.

In addition, the term "and/or" herein is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

A battery of a preferred embodiment of a battery to which the battery post mounting structure of the present utility model is applied will be described in detail with reference to fig. 1 to 5.

In the present embodiment, a cylindrical battery is described as an example, but the battery post mounting structure according to the present utility model is also applicable to batteries of other shapes, for example, to batteries of a bar shape and a rectangular parallelepiped shape. In the present embodiment, the battery is preferably a lithium secondary battery, but the present utility model is also applicable to other batteries and secondary batteries that require a battery post mounting structure.

As shown in fig. 1 to 3, the battery of the present embodiment includes: a cylindrical housing 100; a positive electrode part 200 provided at the upper end of the case 100; and a negative electrode part 300 provided at the lower end of the case 100.

In the present embodiment, since the mounting structure of the positive electrode 200 is improved, the battery is more efficiently mounted on the positive electrode 200 and has good stability, only the mounting structure of the positive electrode 200 will be described in detail. It is possible for those skilled in the art to clearly determine how to select the mounting structure of the battery negative electrode 300 applicable to the present utility model based on the description of the present utility model, and thus detailed description of the negative electrode 300 is omitted.

Fig. 4 and 5 show the detailed structure of the positive electrode 200. As shown in fig. 1 and 3 to 5, the positive electrode portion 200 is used to connect and fix the battery post of the positive electrode and the case 100 in an insulated manner, and as a battery post mounting structure of the positive electrode portion 200, a post 210 as a battery positive electrode is provided at one end of the case 100, a mounting hole 111 for mounting the battery post mounting structure is formed at one end of the case 100, and the battery post mounting structure includes the post 210, a first fixing ring 220, a second fixing ring 230 and an insulating portion 240 so as to expose the post 210 from the mounting hole 111 to one end of the case 100 in an insulated manner from the case 100.

[ Main component of electrode portion 200 ]

In the present embodiment, the terminal 210 includes a terminal body 211 having one end exposed from the mounting hole 111, and a connection piece 212 provided at the other end of the terminal body 211 and located in the housing 100 for connecting the battery cells. Since the connection piece 212 matches the inner cross-sectional shape of the case 100, when the pole body 211 is attached to the attachment hole 111 of the case 100, the pole 210 needs to be provided in the case 100 from the open end at the other end of the case 100, pushed to the one end side of the case 100 in the axial direction of the case 100, and the pole body 211 is exposed from the attachment hole 111, and then the pole 210 is fixed to the case 100.

In the present embodiment, in order to secure the pole 210 and the case 100 more firmly, a stepped portion 213 recessed inward in the circumferential direction is provided at one end of the pole body 211. The step 213 is provided with a first fixing ring 220, and the first fixing ring 220 is made of sheet metal and has a through hole at the center thereof, which is matched with the step 213.

The through hole of the first fixing ring 220 is engaged with the stepped portion 213, and the first fixing ring 220 and one end of the pole body 211 can be fixedly connected by welding, so that the first fixing ring 220 and the pole body 211 can be assembled more conveniently and stably. The outer circumferential dimension of the first fixing ring 220 is larger than the dimension of the mounting hole 111 of the housing 100, so that a projection of the first fixing ring 220 on a plane perpendicular to the axial direction (simply referred to as "planar projection" in the present utility model) overlaps at least a portion of one end face of the housing 100 around the mounting hole 111 to form a first overlapping portion 221.

On the other hand, a second fixing ring 230 is attached to the periphery of the attachment hole 111 of the case 100, and the second fixing ring 230 is made of sheet metal, is coaxial with the attachment hole 111, and has a through hole in the center thereof, and at least the upper end surface of the pole body 211 is exposed from the through hole. The second fixing ring 230 has an inner peripheral portion which overlaps at least a part of the first overlapping portion 221 in plan view, and a second overlapping portion 231 is formed, and the outer peripheral portion and the axially outer end surface of the housing 100 can be connected and fixed by welding. In the present utility model, the outer side and the inner side in the axial direction of the housing 100 correspond to the up-down direction in the drawing, and are therefore simply referred to as the up-down direction, respectively.

Thus, the outer peripheral portion of the first fixing ring 220 is provided between the peripheral portion of the mounting hole 111 of the housing 100 and the inner peripheral portion of the second fixing ring 230 in the axial direction, and the three planar projections are formed to have overlapping portions, so that the outer peripheral portion of the first fixing ring 220 can be effectively sandwiched between the second fixing ring 230 and the peripheral portion of the mounting hole 111 in the axial direction, and the insulating portion 240 is filled in the gap, thereby making it possible to fix the pole 210 to the mounting hole 111 of the housing 100 stably in the axial direction. The first fixing ring 220 and the second fixing ring 230 are respectively connected with the pole body 211 and the shell 100 and are provided with overlapped parts for pole fixing, so that on one hand, the welding and sealing of the pole are facilitated, and the structural strength and fatigue resistance of the pole part are improved; on the other hand, the assembly process is simplified, and the efficiency is higher.

Accordingly, a gap is formed between the first fixing ring 220 and the post body 211 and the second fixing ring 230 and the housing 100, which communicates between the upper end outer space of the housing 100 and the inner space of the housing 100, and the insulating portion 240 is formed by filling the gap with an insulating material, so that the first fixing ring 220 and the post body 211 and the second fixing ring 230 and the housing 100 can be insulated from each other, and the post body 211 exposed to the mounting hole 111 at one end of the housing 100 can be insulated from the housing 100, and the post body 211 can be fixed to the mounting hole 111 of the housing 100 in the axial direction and the circumferential direction.

In this embodiment, the pole body 211 and the connecting piece 212 are integrally formed to form an integral pole, and preferably, the pole body 211 and the connecting piece 212 are made into an integral structure by adopting a stamping process, so that the integrity of the pole body 211 and the connecting piece 212 is stronger, the overcurrent is more stable, the overcurrent capacity and the safety of the battery are improved, and the integral pole can be integrally assembled with the housing 100, thereby simplifying the pole assembling process and optimizing the process. Since the connection piece 212 is disposed at the lower end of the pole 210, the insulation portion 240 extends outward in the circumferential direction to cover the upper surface of the connection piece 212 and insulate it from the lower surface of the end surface of the housing 100. So that the positive electrode portion 200 is mounted and fixed in an insulated manner with the case 100.

Alternatively, the post body 211 and the connection piece 212 may be connected together by two separate parts, preferably by welding. During assembly, the integrally formed pole 210 is pushed from the inside of the battery chamber from bottom to top toward the mounting hole 111, so that the upper end of the pole body 211 is exposed to the mounting hole 111, and the pole body 211 is further fixed.

In the present embodiment, since the pole 210, particularly the pole body 211, is formed to protrude from one end of the case 100 in consideration of the demand for versatility of the conventional secondary battery, the shapes of the peripheral portion of the mounting hole 111 of the case 100, the first fixing ring 220, and the second fixing ring 230 are specifically designed, and the detailed description will be made below mainly with reference to fig. 5, which is a partial enlarged view of the projection of the secondary battery on a plane passing through the axial center.

In the present embodiment, a recess 112 is formed in the housing end surface of the surrounding portion of the mounting hole 111 in the axial direction of the housing 100. The first fixing ring 220 has an outer peripheral portion overlapping the recess 112 in the axial direction.

The inner peripheral portion of the first fixing ring 220 is fitted to the stepped portion 213, and is provided with a first offset portion that is located toward the inside in the axial direction of the pole 210 during extension in the circumferential direction from the circumferential inner side to the circumferential outer side. Specifically, in the process of extending the first fixing ring 220 from the circumferential inner side to the circumferential outer side, after forming the first bending portion 222 facing the axial inner side of the housing 100, the first fixing ring is bent again to the circumferential outer side, and overlaps with the recess portion 112 of the mounting hole 111 in a parallel manner, thereby forming the first overlapping portion 221. By providing the first bending portion 222, the upper end side of the pole 210 can be covered as much as possible by the first fixing ring 220, and the pole 210 is supported, so that the strength of the pole 210 is improved, the pole is protected from being damaged by external force, and the assembly of the first fixing ring 220 and the pole 210 is smoother.

Further, a second biasing portion is provided on the second fixing ring 230 in the opposite direction to the first fixing ring 220. Specifically, the second fixing ring 230 provided on the outer side in the axial direction of the housing 100 is fixedly connected to an annular surface of the mounting hole 111, which is located on the outer side of the outer peripheral surface of the recess 112 and perpendicular to the axis, and is formed with a second bending portion 232 which is bent in the outer side in the axial direction of the housing 100 in the process of extending to the inner side, and is then bent again to the inner side in the circumferential direction, and further is overlapped with the outer peripheral portion of the first fixing ring 220 and the recess 112 in a parallel manner, thereby forming the second overlapped portion 231. By providing the second bending part 232, the pole 210 and the first fixing ring 220 supported thereto can be effectively protected, while the assembly of the second fixing ring 230 is facilitated.

By providing the mounting hole 111, the first fixing ring 220, and the second fixing ring 230 with the recess 112, the first bending portion 222, and the second bending portion 232 as the offset portions, it is possible to easily adjust the axial position of the first overlapping portion 221 of the first fixing ring 220 between the recess 112 of the case 100 and the second overlapping portion 231 of the second fixing ring 230, and to reduce the length occupied by the mounting structure in the axial direction as much as possible, thereby improving the capacity of the secondary battery.

In the present embodiment, the position of the inner peripheral surface of the first fixing ring 220 on the outer side in the axial direction of the housing 100 exceeds the position of the inner peripheral surface of the second fixing ring 230 on the outer side in the axial direction of the housing 100. Thereby, the inner peripheral surface of the second fixing ring 230 is directed to the outer peripheral surface of the first bending portion 222 of the first fixing ring 220 in the circumferential inner direction. In this way, the second fixing ring 230 can provide support in the circumferential inner and outer directions to the pole body 211 via the insulating portion 240.

In the present embodiment, the inner peripheral portion of the first fixing ring 220 and the outer peripheral surface of the pole body 211 may be connected and fixed by any connection method, preferably by welding, and is particularly suitable for use in a butt welding process. The first fixing ring 220 extends from the outer circumferential surface of the pole body 211 in the circumferential outer direction, then extends substantially in the axial direction of the pole body 211 toward the lower end side of the pole body 211, and then extends in the circumferential outer direction until its planar projection overlaps at least a portion of the recess 112, thereby forming a first overlapping portion 221. The first fixing ring 220 is formed such that the coaxiality of the assembly can be improved as much as possible when the electrode part 200 is assembled and welded, and the problems of eccentricity, tilting, etc. of the first fixing ring 220 due to the vibration of the device during the welding process can be effectively reduced.

Although in the present embodiment, the first overlapping portion 221 and the concave portion 112 are all overlapped on a plane perpendicular to the axial direction, and have a complete ring shape; in other embodiments, the first overlap portion 221 may have a notch open to the outside, and a plurality of notches may be provided in the circumferential direction of the first overlap portion 221, on the basis of securing the mounting strength of the pole 210. Thus, the first fixing ring 220 extends from the outer circumferential surface of the pole body 211 to the circumferential outside thereof to the plane projection thereof overlapping at least a portion of the recess 112.

The first overlapping portion 221 is provided in a recess formed in the recess 112, so that the first overlapping portion 221 and the housing end surface of the recess 112 on the outer side in the circumferential direction are positioned close to each other in the axial direction. In the present embodiment, the first overlapping portion 221 is made slightly higher than the case end face.

The gap between the first fixing ring 220 and the recess 112 is further compressed by a portion provided with an insulation portion 240 to secure insulation between the first fixing ring 220 and the recess 112.

In the present embodiment, although the step 213 is formed at the connection between the pole body 211 and the first fixing ring 220, the step 213 is formed to be higher in the axial direction from the outer circumferential surface of the pole body 211 to the inner circumferential surface, and the angle and shape of the step 213 match the angle and shape of the inner circumferential surface of the first fixing ring 220. However, in other embodiments, the step 213 may not be provided. In the present embodiment, by providing the step portion 213, the step portion 213 is correspondingly connected to the inner circumferential surface of the first fixing ring 220 during assembly and welding, so that the connection between the pole body 211 and the first fixing ring 220 is facilitated by the step portion 213, and a certain support is provided for the first fixing ring 220, thereby improving the stability and reliability of the assembly of the pole 210.

A clearance fit is formed between the inner circumferential surface of the first fixing ring 220 and the pole body 211, facilitating the assembly between the pole 210 and the first fixing ring 220.

In the present embodiment, the first fixing ring 220 and the pole body 211 are made of the same metal material, preferably aluminum. On the one hand, the first fixing ring 220 is made of a metal material, has a certain strength, has high structural strength after welding, and can stably support the fixed pole 210; on the other hand, the first fixing ring 220 and the pole body 211 are made of the same material, so that welding is facilitated, and the problem existing in welding of different materials is avoided.

Accordingly, the first fixing ring 220 is disposed on the outer circumferential side of the pole body 211, is supported above the recess 112 via a part of the insulating portion 240, is welded to the outer circumferential surface of the pole body 211, and is fixed by connecting the first fixing ring 220 to the pole 210, thereby restricting displacement of the pole 210 in the axial direction perpendicular to the axial direction toward the axial inner side of the housing 100.

In the present embodiment, the inner peripheral portion of the second fixing ring 230 has a second overlapping portion 231 provided above the first overlapping portion 221 of the first fixing portion 220, and the planar projection overlaps at least a part of the first overlapping portion 221.

The gap between the second overlapping portion 231 and the first overlapping portion 221 is provided with a portion of the insulating portion 240 in a compressed manner, and the second overlapping portion 231 and the recess 112 sandwich the first overlapping portion 221 and a portion of the insulating portion 240 therebetween, thereby ensuring insulation between the first fixing ring 220 and the second fixing ring 230.

In the present embodiment, the first bending portion 222 and the second bending portion 232 are provided to the first fixing ring 220 and the second fixing ring 230, respectively, so that a gap having a plurality of bending shapes is formed between the first fixing ring 220 and the pole 210, and the mounting hole 111 and the second fixing ring 230 of the case 100. When the electrode portion 200 is assembled, the insulating portion 240 is filled in the gap, so that the relative positions of the components are ensured to be stable in the assembly welding process, and the stability of assembly welding is greatly improved. This will be described in detail later.

In the present embodiment, the planar projection of the second overlapping portion 231 is entirely overlapped with the recess 112 and the first overlapping portion 221, and has a complete annular shape. However, in other embodiments, the second overlapping portion 231 may be provided with notches open to the inside, and a plurality of notches may be provided in the circumferential direction of the second overlapping portion 231, on the basis of securing the mounting strength of the pole 210. On the other hand, the first overlapping portion 221 may be provided with an open notch facing outward in a manner corresponding to the second overlapping portion 231, and the recess 112 may be provided with an open notch facing inward in a manner corresponding to the first overlapping portion 221 and the second overlapping portion 231, so that the three notches are used to provide secondary battery internal pressure control paths, such as a pressure release valve, and the like, so that at least a part of the three and the two overlap each other in plan projection. However, in the present disclosure, since the pressure control paths provided in the three notches are not essential to the protection of the present disclosure, the understanding of the scope of the present disclosure by those skilled in the art is not affected, and thus redundant description of the pressure control paths is omitted.

The second fixing ring 230 extends from the outer circumference of the second overlapping portion 231 to the outer circumference, and then the outer circumference of the second fixing ring 230 extends along the axially outer end surface of the housing 100 to the outer circumference of the recess 112 to abut against and be welded to the portion of the housing 100, and a penetration welding process is preferably used for the welding and fixing of the portion.

In the present embodiment, the second fixing ring 230 is made of the same metal material as the housing 100, preferably steel. Adopt the steel welding of same material, both be convenient for the welding of same material, avoid the problem that different material welding exists, simultaneously because steel intensity is higher, be difficult for the deformation, consequently structural strength is high after the welding, can stably centre gripping second overlap portion 231 and recess 112 between first overlap portion 221, can effectively keep electrode portion 200's installation stability.

The configuration of the main body member constituting the electrode unit 200 of the secondary battery according to the present embodiment is described in detail above, and the configuration of the insulating unit 240 provided in the electrode unit 200 and serving as an assist and support will be described below. The insulating portion 240 is only an example of the insulating portion in the present embodiment, and the purpose of the insulating portion 240 is to facilitate handling and to improve stability when assembling and welding the main body member of the electrode portion 200, but the insulating portion 240 may be flexibly selected according to the material selected, the filling method, and the like.

[ formation of insulation portion 240 ]

The insulating part 240 includes: a first insulating member 241 that covers the outer peripheral surface of the base portion of the pole body 211 connected to the connection piece 212 at the end portion of the pole body 211 on the inner side in the axial direction of the housing 100 so as to insulate the base portion of the pole body 211 from the mounting hole 111; a second insulating member 242 extending from an inner peripheral side of the mounting hole 111 to an outer peripheral side of the first overlapping portion 221 along a gap between the recessed portion 112 (i.e., an end surface of an outer peripheral side of the mounting hole 111) and the first overlapping portion 221 to insulate between the first fixing ring 220 and the housing 100; a third insulating member 243 extending to the inner circumferential side of the second fixing ring 230 along the gap between the first and second fixing rings 220 and 230 and covering the outer circumferential surface of the first fixing ring 220 to insulate between the first and second fixing rings 220 and 230. By dividing the insulating part 240 into the first, second, and third insulating parts 241, 242, 243 as described above, the main parts of the electrode part 200 and the insulating part 240 can be assembled conveniently and quickly, and the positioning is accurate.

In the present embodiment, since the post body 211 and the connection piece 212 are integrally formed, the first insulating member 241 also extends in the outer circumferential direction along the gap between the connection piece 212 and the axially inner surface of the recess 112, covering the axially outer surface of the housing 100 of the connection piece 212.

In the present embodiment, it is preferable that the first insulating member 241 and the third insulating member 243 are provided as ring members made of plastic material, and the second insulating member 242 is provided as a main seal ring as a ring member made of rubber material.

By configuring the second insulating member 242 as a main seal ring made of a rubber material, and adopting the first and third insulating members 241, 243 made of a plastic material on the both axial sides of the housing 100 of the second insulating member 242, respectively, it is possible to provide a main sealing effect by the second insulating member 242 and to provide a sufficient supporting force to the pole body 211 by the first and third insulating members 241, 243. The first and third insulating members 241 and 243 as plastic members disposed at both sides of the second insulating member 242 can effectively reduce corrosion of the second insulating member 242 by the electrolyte in the secondary battery and the external environment, and ensure sealing performance of the secondary battery for long-term use.

An upper convex annular portion 2421 extending upward from the upper surface of the concave portion 112 is formed on the outer peripheral portion of the second insulating member 242; a main body portion 2422 of the second insulating member 242 extending from the lower end of the upper convex annular portion 2421 toward the inner peripheral side of the mounting hole 111 along the gap between the concave portion 112 and the first overlapping portion 221; a lower convex annular portion 2423 is formed on the inner peripheral portion of the second insulating member 242 so as to extend downward from the main body portion 2422 along the inner peripheral surface of the mounting hole 111 and to be interposed between the outer peripheral surface of the first insulating member 241 and the inner peripheral surface of the mounting hole 111. By forming the second insulating member 242 to have a structure having a plurality of turns, the second insulating member 242 can be effectively used for temporary positioning during welding of the electrode assembly 200, and the sealing performance of the finished secondary battery can be maintained for a long time.

Accordingly, the second insulating member 242 is overlapped with a part of the first insulating member 241 in the circumferential direction outside-inside at a portion where the inner peripheral surface of the mounting hole 111 faces the outer peripheral surface of the pole body 211.

[ electrode portion Assembly ]

In the present embodiment, the first, second, and third insulating members 241, 242, 243 are provided to facilitate assembly of the electrode portion 200 as a battery post mounting structure, and to ensure insulation between the post 210 and the case 100.

When the electrode portion 200 is assembled, the second insulating member 242, the first fixing ring 220, and the third insulating member 243 are placed on the upper side of the recess 112 in this order from the axial outer side (upper side in the drawing), and then the second fixing ring 230 and the case 100 are penetration welded to form a first welded portion.

The first insulating member 241 and the integrated pole including the pole body 211 and the connection piece 212 (the connection piece 212 is welded to the battery tab in advance) are pushed from the inner side of the housing 100 in the axial direction to the mounting hole 111 through the housing 100, so that the pole body 211 is exposed out of the mounting hole 111, and then the upper end step 213 of the pole body 211 and the first fixing ring 220 are welded by butt welding to form a second welding portion.

Thereby, a structure in which the first insulating member 241, the case 100, the second insulating member 242, the first fixing ring 220, the third insulating member 243, and the second fixing ring 230 are stacked in this order is formed.

As described above, the battery post mounting structure of the present embodiment can complete the mounting of the electrode portion 200, particularly the post 221, only by performing two welding operations on the top of the secondary battery, that is, the welding operation of the first welding portion of the second fixing ring 230 and the housing 100, and the welding operation of the second welding portion of the post body 211 and the first fixing ring 220, and only by performing two welding operations, the efficiency is higher compared with the injection molding and the sealing process, the manufacturing cost is low, and compared with the sealing process, the axial larger space utilization is ensured, which is beneficial to improving the energy density of the battery core.

In addition, the electrode part 200 is doubly fixed by adopting the first fixing ring 220 and the second fixing ring 230, so that the structural strength and fatigue resistance of the pole part are improved, and the assembly stability and reliability are higher.

And, based on the improvement of post position structural strength to only need carry out welded fastening from the outside, guaranteed the inside assembly convenience of battery cavity and installation space, thereby can set up the diameter of an organic whole post including post body 211 and connection piece 212 great, and then post center overcurrent diameter is great to be favorable to promoting the overcurrent ability of battery, promotes battery performance.

In the above embodiment, the concave portion 112 is formed in the vicinity of the mounting hole 111, but in other embodiments, the concave portion 112 may not be formed, the second insulating member 242 is disposed at the upper end of the mounting hole 111 having a flat plane, and the first fixing ring 220, the third insulating member 243, and the second fixing ring 230 are disposed to match the first fixing ring 220, and in this structure, the package may be completed by two times of welding.

In addition, although the first and second bending portions 222 and 232 are formed in the first and second fixing rings 220 and 230, in other embodiments, at least a part of the first overlapping portion 221 of the first fixing ring 220 is sandwiched between the second overlapping portion 231 of the second fixing ring 230 and the surrounding portion of the mounting hole 111, and at least a part of the first overlapping portion overlaps.

In addition, in some embodiments, the first fixing ring 220 may be formed in a flat ring shape, and the third insulating member 243 and the second fixing ring 230 are disposed to match the first fixing ring 220.

In the above embodiment, the first and second bending portions 222 and 232 of the first and second fixing rings 220 and 230 are formed in a shape of right angle bending, but the arrangement of the present embodiment is not limited to each bending portion, and in other embodiments, the bending portions may be arranged according to the actual size requirement, or may be inclined with respect to the axis.

In the above-described embodiment, the pole body 211 is provided in a cylindrical shape, but the arrangement of the present embodiment is not limited to the pole body 211 of the present disclosure, and in other embodiments, the pole body 211 may be provided in other shapes such as a square-round shape in a projection on a plane perpendicular to the axial direction, and the mounting hole 111, the first fixing ring 220, the second fixing ring 230, and the insulating portion 240 may be provided in any shape in a matching manner.

In the above embodiment, the case where the battery post mounting structure is applied to the positive electrode portion of the secondary battery will be described. However, the structure may be applied to the negative electrode portion as needed, and is not particularly limited.

In addition, in the above-described embodiments, the battery is provided as a cylindrical battery, but the battery of the present disclosure is not limited to the arrangement of the present embodiment, and in other embodiments, a battery of other cell structures or housing structures may be employed as long as the battery post mounting structure of the present disclosure can be applied to the structure thereof.

In the above embodiment, the "annular portion" is not a circular annular shape, but is a closed line shape formed arbitrarily in accordance with the sectional shapes of the secondary battery and the electrode portion.

In the description of the present specification, the terms "connected," "mounted," "secured," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, the terms "one embodiment," "some embodiments," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (12)

1. A battery post mounting structure, comprising:

a housing having an end surface formed with a mounting hole;

a post including a post body provided in the mounting hole with an upper end exposed from the mounting hole;

a first fixing ring extending from an outer peripheral surface of the pole body to an outer peripheral side, wherein a planar projection overlaps at least a part of the end surface on the outer peripheral side of the mounting hole to form a first overlapping portion, and the first overlapping portion is disposed above the end surface;

a second fixing ring having an inner peripheral portion provided above the first overlapping portion, a second overlapping portion overlapping at least a part of the first overlapping portion in plan view, and an outer peripheral portion connected and fixed to an end face of the housing;

and the insulating part is filled in gaps formed between the first fixing ring, the pole body, the second fixing ring and the shell.

2. The battery post mounting structure according to claim 1, wherein,

the first fixing ring is provided with a first biasing portion that approaches the lower end side of the pole in the process of extending from the circumferential inner side to the circumferential outer side.

3. The battery post mounting structure according to claim 1, wherein,

the second fixing ring is provided with a second biasing portion which is close to the upper end side of the pole in the process of extending from the circumferential outer side to the circumferential inner side.

4. The battery post mounting structure according to claim 1, wherein,

the end face is provided with a recess portion that biases the mounting hole toward the lower side of the housing.

5. The battery post mounting structure according to any one of claims 1 to 4, wherein,

the insulating portion may comprise a metal layer,

a first insulating member covering an outer peripheral surface of the base portion of the pole body at the base portion of the pole body to insulate between the base portion of the pole body and the mounting hole;

a second insulating member extending from an inner peripheral side of the mounting hole to an outer peripheral side of the first overlapping portion along a gap between the end face of the outer peripheral side of the mounting hole and the first overlapping portion to insulate between the first fixing ring and the housing;

and a third insulating member extending along a gap between the first and second fixing rings to an inner peripheral side of the second fixing ring and covering an outer peripheral surface of the first fixing ring to insulate the first and second fixing rings from each other.

6. The battery post mounting structure according to claim 5, wherein,

the lower end of the pole body is provided with a connecting sheet which is integrated with the pole body,

the first insulating member extends circumferentially outward along a gap between the connection piece and the housing, covering an upper surface of the connection piece.

7. The battery post mounting structure according to claim 6, wherein the post body is integrally stamped or welded with the connecting piece.

8. The battery post mounting structure according to claim 5, wherein,

forming an upper convex annular portion extending upward from an upper surface of the end surface on an outer peripheral portion of the second insulating member;

a main body portion of the second insulating member extending from a lower end of the upper convex annular portion toward an inner peripheral side of the mounting hole along a gap between an upper surface of the end face and the first overlapping portion;

a lower convex annular portion is formed on the inner peripheral portion of the second insulating member, extending downward from the inner peripheral portion of the main body portion along the inner peripheral surface of the mounting hole, and interposed between the outer peripheral surface of the first insulating member and the inner peripheral surface of the mounting hole.

9. The battery post mounting structure according to claim 1, wherein,

the upper end outer peripheral surface of the pole body is provided with a step part which is lowered from the inner peripheral side to the outer peripheral side,

the first fixing ring is fitted to the stepped portion on the inner peripheral side.

10. The battery post mounting structure according to claim 1, wherein,

the first fixing ring and the pole body are made of the same metal material and are fixed in a welding mode;

the second fixing ring and the shell are made of the same metal material and are fixed by welding.

11. The battery post mounting structure according to claim 5, wherein the second insulating member is made of a rubber material;

the first insulating part and the third insulating part are made of plastic materials.

12. A secondary battery characterized in that:

at least any one of the electrodes comprises the battery post mounting structure according to any one of claims 1 to 11.