CN219801074U - Cover plate assembly of battery - Google Patents

Abstract

The utility model provides a cover plate component of a battery, which comprises a cover plate, a liquid injection hole and a sealing component; the cover plate is provided with a first groove and a concave body which are concavely formed along the thickness direction of the cover plate; the liquid injection hole is arranged on the concave body; the sealing component is accommodated in the first groove and is abutted against one end face of the concave part body, which faces the first groove; the first bulge of the sealing member is protruded from the outer peripheral surface of the sealing body of the sealing member in a direction away from the sealing body, the first bulge is abutted with the groove wall of the first groove, and one end surface of the first bulge, which faces the concave body, and the outer peripheral surface of the sealing body form a second groove of the sealing member. In the welding process, the first bulge is firstly heated to generate a tendency of arching, and the sealing body is not easy to arch along with the first bulge due to the existence of the second groove, so that the whole arching degree of the sealing member is reduced, the stress born by the whole sealing member is reduced, the welding part of the sealing member and the cover plate is not easy to crack, and the sealing performance is improved.

Description

Cover plate assembly of battery

Technical Field

The utility model relates to the technical field of power batteries, in particular to a cover plate assembly of a battery.

Background

In the manufacturing process of the secondary battery (for example, lithium ion battery), after the liquid injection process is completed, laser sealing welding is performed on the liquid injection hole on the cover plate of the shell through the sealing member, so that leakage of electrolyte is prevented, and the air tightness of the secondary battery is ensured.

The sealing member and the case cover plate can generate a large amount of heat in the welding process, so that stress can be generated due to cold and heat shrinkage, the welded sealing member has a tendency to arch towards the outside of the secondary battery, the stress is larger as the arch degree is larger, and when the stress is overlarge, the welding mark of the sealing member and the case cover plate can be caused to be partially cracked, so that the sealing is invalid.

Disclosure of Invention

The utility model aims to overcome the defect that the welding part of a sealing component and a shell cover plate is easy to crack and cause sealing failure in the prior art due to the influence of welding stress.

The utility model solves the technical problems by the following technical scheme:

a cover plate assembly of a battery comprises a cover plate, a liquid injection hole and a sealing member;

the cover plate is provided with a concave part recessed along the thickness direction of the cover plate, and the concave part sequentially comprises a first groove and a concave part body along the thickness direction of the cover plate;

the liquid injection hole is arranged on the concave body, and two ends of the liquid injection hole in the thickness direction of the cover plate penetrate through the concave body;

the sealing member is accommodated in the first groove, and is abutted against one end face of the concave part body, which faces the first groove; the sealing member comprises a sealing body, a first protruding portion and a second groove, wherein the first protruding portion protrudes from the outer circumferential surface of the sealing body to a direction away from the sealing body, the first protruding portion is abutted with the groove wall of the first groove, and the first protruding portion faces towards one end surface of the concave portion body and the outer circumferential surface of the sealing body to form the second groove.

In this scheme, set up the first bulge of the cell wall butt with first recess at seal body's periphery side for sealing member passes through the cell wall welding of first bulge and first recess, and in the welding process, first bulge is first because the heat produces the trend of arch to the direction of keeping away from the concave part body. And because the first bulge is provided with the second groove towards one side of the concave part body, the sealing body is not easy to arch along with the first bulge towards the direction away from the concave part body in the welding process, so that the whole arch degree of the sealing member is reduced, the stress born by the whole sealing member is reduced, the welding part of the sealing member and the cover plate is not easy to crack, and the sealing performance is improved.

Preferably, the height of the first protruding portion in the thickness direction of the cover plate is defined as H1, the height of the first groove in the thickness direction of the cover plate is defined as H1, and the measurement units of H1 and H1 are the same; wherein the ratio of H1 to H1 ranges from 0.02 to 1.

In this scheme, above-mentioned setting guarantees that first bulge has sufficient region and the cell wall welding of first recess, guarantees the welding strength of sealing member and apron.

Preferably, the ratio of H1 to H1 ranges from 0.25 to 0.8.

In this scheme, above-mentioned setting also makes to have sufficient interval between the tank bottom of first bulge and first recess when guaranteeing that first bulge has sufficient region and the cell wall welding of first recess, further slows down the condition that the sealed body followed first bulge together to the direction arch of keeping away from the concave part body.

Preferably, the sealing member further includes a second protrusion protruding from an end of the sealing body away from the concave body in a direction away from the sealing body.

In this scheme, set up the second bulge in the one side that the concave part body was kept away from to the seal body for the thickness of the sealing member of this region is thicker, is difficult for taking place the arch, reduces the stress that sealing member receives, prevents the welded part fracture of sealing member and apron, improves the leakproofness.

Preferably, the sum of the heights of the second protruding part and the sealing body in the thickness direction of the cover plate is defined as H2, the height of the first protruding part in the thickness direction of the cover plate is defined as H1, and the metering units of H1 and H2 are the same; wherein H1 is less than or equal to H2.

In this scheme, above-mentioned setting slows down the condition that sealed body follows first bulge together to the direction arch of keeping away from the concave part body through the ratio between the thickness of the first bulge of rational design and the thickness through the thickening area of second bulge.

Preferably, H1 < H2.

In this case, the above arrangement further slows down the situation in which the sealing body arches together with the first projecting portion in a direction away from the recessed portion body.

Preferably, the sum of the heights of the second protruding part and the sealing body in the thickness direction of the cover plate is defined as H2, the height of the first groove in the thickness direction of the cover plate is defined as H1, and the metering units of H2 and H1 are the same; wherein the ratio of H2 to H1 ranges from 0.2 to 9.

In this scheme, above-mentioned setting is through the thickness of the region of second bulge thickening of rational design second bulge control in the sealing member to make the region of thickening be difficult to take place the arch, reduce the stress that sealing member receives, prevent the welding department fracture of sealing member and apron, improve the leakproofness.

Preferably, the ratio of H2 to H1 ranges from 0.5 to 2.

In this scheme, above-mentioned setting is when guaranteeing that the regional difficult arch that takes place of thickening, avoids the too big or undersize of thickness of second bulge, prevents to increase because the too big material cost that causes of thickness of second bulge, or because the too little effect to slowing down the arch of the thickness of the thickening region that causes of thickness of second bulge is not obvious.

Preferably, the diameter of the second protruding portion is defined as D1, the aperture of the end, away from the concave portion body, of the first groove is defined as D1, and the measuring units of D1 and D1 are the same; wherein the ratio of D1 to D1 is in the range of 0.01-3.

In this scheme, above-mentioned setting is through the region of the thickening of rational design second bulge in the control sealing member through the diameter of second bulge to make the region of thickening be difficult to take place the arch, reduce sealing member's stress, prevent sealing member and apron's welded part fracture, improve the leakproofness. When the ratio of D1 to D1 is greater than 1, the second protrusion is located outside the first groove to prevent the second protrusion from interfering with the cover plate.

Preferably, the ratio of D1 to D1 ranges from 0.6 to 1.2.

In this scheme, above-mentioned setting is when guaranteeing that the region of thickening is difficult to take place the hunch, avoids the diameter of second bulge too big or undersize, prevents to increase because the diameter of second bulge is too big and the material cost that causes increases, or because the thickening region that the diameter of second bulge is too little and the effect to slowing down the hunch is unobvious.

Preferably, the shape of the second protruding part is any one of a cylinder, a cuboid, a triangular prism and a circular tube;

and/or, an end surface of the second protruding part far away from the sealing body is a plane or a curved surface protruding towards the outer part of the second protruding part.

In this solution, several shapes of the second protrusions are provided, so that the sealing member is more versatile and applicable.

Preferably, the cover plate assembly of the battery further comprises a third protruding portion and an avoidance groove, two ends of the third protruding portion in the thickness direction of the cover plate are respectively connected with the sealing body and the concave portion body, the sealing body faces one end face of the concave portion body and the third protruding portion enclose into the avoidance groove, a notch of the avoidance groove faces the concave portion body, and the projection of the liquid injection hole along the thickness direction of the cover plate on the avoidance groove is located in the avoidance groove.

In this scheme, can insert the sealing nail in the notes liquid hole in order to further improve the leakproofness, the sealing nail can be protruding in notes liquid hole generally, dodges the groove and can avoid sealing nail and sealing member to produce and interfere, avoids sealing member welding the front and rises and warp.

Preferably, the third protruding part and the sealing body are integrally formed; or, the third protruding portion and the concave portion body are integrally formed.

In this aspect, the seal member naturally forms the escape groove when the third projecting portion is integrally formed with the seal body. When the third protruding part and the concave part body are integrally formed, the sealing body is abutted on the third protruding part to form an avoidance groove.

Preferably, when the third protruding portion and the sealing body are integrally formed, an outer edge abutting against a groove wall of the first groove is formed at one end, away from the concave portion body, of the first protruding portion, the outer edge forms a first measuring portion, and a notch edge of the avoidance groove forms a second measuring portion; defining the shortest distance between the first measuring part and the second measuring part as L, wherein the height of the cover plate in the thickness direction of the cover plate is T, and the L is the same as the measurement unit of T; wherein the ratio of L to T is in the range of 0.9-1.1;

or when the third protruding part and the concave part body are integrally formed, one end of the first protruding part far away from the concave part body is provided with an outer edge which is abutted with the groove wall of the first groove, the outer edge forms a first measuring part, and the outer edge of the sealing body facing one end of the concave part body forms a second measuring part; defining the shortest distance between the first measuring part and the second measuring part as L, wherein the height of the cover plate in the thickness direction of the cover plate is T, and the L is the same as the measurement unit of T; wherein the ratio of L to T is in the range of 0.9-1.1.

In this scheme, above-mentioned setting prevents on the one hand that sealing member and sealing nail from welding, and on the other hand also can prevent that sealing member can carry out welded regional thickness too little, avoids welding heat influence effect aggravation, is difficult to produce and warp in order to prevent welding failure.

Preferably, the height of the first groove in the thickness direction of the cover plate is defined as h1, the height of the avoiding groove in the thickness direction of the cover plate is defined as h2, and the measurement units of h1 and h2 are the same; wherein the ratio of h2 to h1 ranges from 0.1 to 1.

In this aspect, the above arrangement prevents interference between the seal nail and the seal member due to too small a depth of the escape groove.

Preferably, the ratio of h2 to h1 ranges from 0.2 to 1.

In this scheme, above-mentioned setting can further increase and dodge the relative degree of depth in groove, avoids sealing nail and sealing member to produce the interference.

The utility model has the positive progress effects that: the periphery side of the sealing body is provided with the first protruding part which is abutted with the groove wall of the first groove, so that the sealing member is welded with the groove wall of the first groove through the first protruding part, and in the welding process, the first protruding part is firstly heated to generate a tendency of arching towards a direction far away from the concave part body. And because the first bulge is provided with the second groove towards one side of the concave part body, the sealing body is not easy to arch along with the first bulge towards the direction away from the concave part body in the welding process, so that the whole arch degree of the sealing member is reduced, the stress born by the whole sealing member is reduced, the welding part of the sealing member and the cover plate is not easy to crack, and the sealing performance is improved.

Drawings

Fig. 1 is a schematic perspective view of a secondary battery according to embodiment 1 of the present utility model.

Fig. 2 is a schematic diagram illustrating a structure of a seal member separated from a cover plate according to embodiment 1 of the present utility model.

Fig. 3 is a schematic view showing the internal structure of a cap assembly of a battery according to embodiment 1 of the present utility model.

Fig. 4 is a schematic structural diagram of a cover plate in embodiment 1 of the present utility model.

Fig. 5 is a schematic structural view of a sealing member of embodiment 1 of the present utility model.

Fig. 6 is a schematic view showing the internal structure of a cap assembly of a battery according to embodiment 2 of the present utility model.

Fig. 7 is a schematic structural diagram of a cover plate in embodiment 2 of the present utility model.

Fig. 8 is a schematic structural view of a seal member according to embodiment 2 of the present utility model.

Fig. 9 is a schematic top view of the seal member of embodiment 3 of the present utility model.

Fig. 10 is a schematic top view of the seal member of embodiment 4 of the present utility model.

Fig. 11 is a schematic top view of the seal member of embodiment 5 of the present utility model.

Fig. 12 is a schematic side view of the seal member of embodiment 6 of the present utility model.

Fig. 13 is a schematic top view of the seal member of embodiment 7 of the present utility model.

Fig. 14 is a schematic side view of the seal member of embodiment 7 of the present utility model.

Reference numerals illustrate:

cover plate assembly 11

Housing 12

Cover plate 2

Recess 21

First groove 211

Recess body 212

Liquid injection hole 3

Sealing member 4

Seal body 41

First projection 42

Second groove 43

Second projection 44

Sealing nail 5

Third projection 6

Avoidance groove 7

Positioning groove 8

Detailed Description

The present utility model will now be described more fully hereinafter with reference to the accompanying drawings, in which preferred embodiments are shown.

Example 1

As shown in fig. 1 and 2, the present embodiment provides a secondary battery including a cap assembly 11, a case 12, and a battery cell assembly (not shown in the drawings), the upper end of the case 12 having an opening (not shown in the drawings) from which the battery cell assembly is placed inside the case 12, the cap assembly 11 being connected to the case 12 and blocking the opening of the case 12 to achieve sealing of the secondary battery.

As shown in fig. 1 to 5, the cap assembly 11 of the secondary battery includes a cap plate 2, a liquid injection hole 3, a sealing member 4, a sealing nail 5, a third protrusion 6, and a relief groove 7.

As shown in fig. 2 to 4, the cap plate 2 has a recess 21 recessed toward the case 12 in the thickness direction of the cap plate 2, the recess 21 including a first groove 211 and a recess body 212 in this order in the thickness direction of the cap plate 2, the first groove 211 being located at one end of the recess body 212 away from the case 12, the upper end of the first groove 211 communicating with the external space of the secondary battery. The liquid injection hole 3 is provided in the concave body 212, and both ends of the liquid injection hole 3 in the thickness direction of the cap plate 2 penetrate the concave body 212, one end of the liquid injection hole 3 communicates with the inside of the case 12, and the other end of the liquid injection hole 3 communicates with the external space of the secondary battery through the first groove 211, whereby the electrolyte can be injected from the outside of the secondary battery into the inside of the case 12 through the liquid injection hole 3.

As shown in fig. 3, the sealing nail 5 is inserted into the liquid injection hole 3 to seal the liquid injection hole 3, prevent the electrolyte in the case 12 from flowing out of the liquid injection hole 3, and ensure the air tightness of the secondary battery. The sealing nail 5 in this embodiment may be made of elastic members such as rubber, and the sealing nail 5 is in interference fit with the liquid injection hole 3, so as to improve the tightness of the liquid injection hole 3. In other alternative embodiments, the sealing spike 5 may also be made of other non-elastic materials, which can be used to effect a seal of the pouring orifice 3.

As shown in fig. 3, the sealing member 4 is accommodated in the first groove 211, the sealing member 4 abuts against an end surface of the concave portion body 212 facing the first groove 211, and the circumferential edge of the sealing member 4 abuts against the groove wall of the first groove 211 and is welded with the groove wall of the first groove 211, so as to further improve the sealing effect on the liquid injection hole 3, and the sealing member 4 can also play a limiting role on the sealing nail 5, so that the sealing nail 5 is prevented from being completely separated from the liquid injection hole 3, and electrolyte leakage caused by separation of the sealing nail 5 or the sealing member 4 from the cover plate 2 is effectively prevented.

As shown in fig. 1 to 3 and 5, the seal member 4 includes a seal body 41, a first projection 42, a second groove 43, and a second projection 44.

As shown in fig. 3 and 5, the first protrusion 42 protrudes from the outer peripheral surface of the seal body 41 in a direction away from the seal body 41, the first protrusion 42 abuts against the groove wall of the first groove 211, and the second groove 43 is defined by an end surface of the first protrusion 42 facing the recess body 212 and the outer peripheral surface of the seal body 41. The first protruding portion 42 in this embodiment is an annular structure, and the first protruding portion 42 extends around the outer peripheral surface of the sealing body 41, so that the circumferential direction of the groove wall of the first groove 211 is abutted with the first protruding portion 42, so that the abutting positions of the first groove 211 and the groove wall are welded conveniently, no gap exists, and the sealing effect is ensured. The second groove 43 is an annular groove, and the lower end of the second groove 43 and one end far away from the sealing body 41 are opened, so that the lower end of the first protruding portion 42 is suspended, and further the arching of the sealing body 41 along the direction of the first protruding portion 42 far away from the concave portion body 212 can be slowed down.

Specifically, the first projecting portion 42 abutting against the groove wall of the first groove 211 is provided on the outer peripheral side of the seal body 41, so that the seal member 4 is welded with the groove wall of the first groove 211 by the first projecting portion 42, and during welding, the first projecting portion 42 is first caused to arch in a direction away from the concave portion body 212 due to heat. Because the second groove 43 is formed on one side of the first protruding portion 42 facing the concave portion body 212, the sealing body 41 is not easy to arch along with the first protruding portion 42 in a direction away from the concave portion body 212 in the welding process, so that the whole arch degree of the sealing member 4 is reduced, the stress on the whole sealing member 4 is reduced, the welding position of the sealing member 4 and the cover plate 2 is not easy to crack, and the sealing performance is improved.

As shown in fig. 3 and 5, the end of the second projecting portion 44, which is away from the concave portion body 212, of the self-sealing body 41 projects in a direction away from the sealing body 41. Specifically, in the present embodiment, the upper end of the first projecting portion 42, the upper end of the sealing body 41, and the notch of the first groove 211 are flush, the length of the second projecting portion 44 in the radial direction of the pouring orifice 3 is equal to the length of the sealing body 41 in the radial direction of the pouring orifice 3 (i.e., the left and right ends of the second projecting portion 44 are flush with the left and right ends of the sealing body 41), the first projecting portion 42 and the sealing body 41 are both located in the first groove 211, and the second projecting portion 44 is located outside the first groove 211. The second protruding part 44 is arranged on one side of the sealing body 41 away from the concave part body 212, so that the thickness of the sealing member 4 in the area is thicker, arching is not easy to occur, the stress born by the sealing member 4 is reduced, the welding part of the sealing member 4 and the cover plate 2 is prevented from cracking, and the sealing performance is improved.

In other alternative embodiments, the length of the second projection 44 in the radial direction of the pouring spout 3 may also be greater or less than the length of the sealing body 41 in the radial direction of the pouring spout 3.

Further, an end surface of the second protruding portion 44 away from the sealing body 41 in the present embodiment is a plane. In other alternative embodiments, an end surface of the second protrusion 44 remote from the sealing body 41 may also be a curved surface protruding toward the outside of the second protrusion 44.

As shown in fig. 3 and 5, both ends of the third projecting portion 6 in the thickness direction of the cover plate 2 are respectively connected to the seal body 41 and the concave portion body 212, and one end surface of the seal body 41 facing the concave portion body 212 and the third projecting portion 6 enclose the escape groove 7, and a notch of the escape groove 7 faces the concave portion body 212. Because the sealing nail 5 can be protruded out of the liquid injection hole 3, the avoiding groove 7 can avoid interference between the sealing nail 5 and the sealing member 4 and avoid tilting of the sealing member 4 before welding. In addition, the relief groove 7 can reduce the contact area between the sealing member 4 and the concave portion body 212, and reduce the pulling force of the sealing member 4 to the weld caused by the heat deformation arch.

Specifically, the third protruding portion 6 and the sealing body 41 in this embodiment are integrally formed, that is, the third protruding portion 6 belongs to a part of the sealing member 4, the sealing member 4 naturally forms the avoiding groove 7, and the projections of the liquid injection hole 3 on the avoiding groove 7 along the thickness direction of the cover plate 2 are all located in the avoiding groove 7. In other alternative embodiments, the third protrusion 6 may be integrally formed with the recess body 212, and the sealing body 41 abuts against the third protrusion 6 to form the relief groove 7.

Further, as shown in fig. 3 and 5, the projections of the relief grooves 7 on the second protruding portion 44 along the thickness direction of the cover plate 2 are located in the second protruding portion 44, so that the sealing member 4 thickened at least partially by the second protruding portion 44 cannot be reduced in thickness due to the provision of the relief grooves 7, the thickness of the sealing member 4 is maximum, arching is least likely to occur, stress applied to the sealing member 4 is reduced, cracking of a welded portion of the sealing member 4 and the cover plate 2 is prevented, and sealing performance is improved.

As shown in fig. 3 and 5, the height of the first projection 42 in the thickness direction of the cover plate 2 is defined as H1, the height of the first recess 211 in the thickness direction of the cover plate 2 is defined as H1, and the measurement units of H1 and H1 are the same; wherein the ratio of H1 to H1 is in the range of 0.02-1 to ensure that the first protrusion 42 has a sufficient area to be welded with the wall of the first groove 211 and to ensure the welding strength of the sealing member 4 with the cap plate 2.

It is further preferable that the ratio of H1 to H1 is in the range of 0.25 to 0.8, thereby ensuring that the first projection 42 has a sufficient area to be welded with the groove wall of the first groove 211 while also allowing a sufficient space between the first projection 42 and the groove bottom of the first groove 211, further slowing down the case where the seal body 41 is arched away from the concave body 212 along with the first projection 42.

As shown in fig. 3 and 5, the sum of the heights of the second projection 44 and the seal body 41 in the thickness direction of the cap plate 2 is defined as H2, and the measurement units of H2 and H1 are the same; wherein H1 is less than or equal to H2. The present embodiment mitigates the situation that the sealing body 41 is arched away from the concave body 212 along with the first protruding portion 42 by reasonably designing the ratio between the thickness of the first protruding portion 42 and the thickness of the thickened region passing through the second protruding portion 44.

It is further preferable that H1 < H2, thereby further slowing down the case where the seal body 41 is arched away from the concave body 212 together with the first convex portion 42.

As shown in fig. 3 and 5, the ratio of H2 to H1 ranges from 0.2 to 9, and the thickness of the region of the sealing member 4 thickened by the second protruding portion 44 is controlled by reasonably designing the thickness of the second protruding portion 44, so that the thickened region is not easy to arch, the stress on the sealing member 4 is reduced, the welding position of the sealing member 4 and the cover plate 2 is prevented from cracking, and the sealing performance is improved.

It is further preferable that the ratio of H2 to H1 is in the range of 0.5 to 2, so that the excessive or insufficient thickness of the second projecting portion 44 is avoided while ensuring that the thickened region is not liable to be arched, and the increase in material cost due to the excessive thickness of the second projecting portion 44 or the insufficient thickness of the thickened region due to the excessively insufficient thickness of the second projecting portion 44 is prevented, and the effect of reducing the arched effect is not noticeable.

As shown in fig. 3 and 5, defining the diameter D1 of the second protrusion 44, the aperture D1 of the end of the first groove 211 away from the recess body 212 is the same as the measurement unit of D1; wherein the ratio of D1 to D1 is in the range of 0.01-3. In this embodiment, the diameter of the second protruding portion 44 is reasonably designed to control the thickened area passing through the second protruding portion 44 in the sealing member 4, so that the thickened area is not easy to arch, the stress borne by the sealing member 4 is reduced, the welding position of the sealing member 4 and the cover plate 2 is prevented from cracking, and the sealing performance is improved. When the ratio of D1 to D1 is greater than 1, the second protrusion 44 is located outside the first groove 211 to prevent the second protrusion 44 from interfering with the cover plate 2.

It is further preferable that the ratio of D1 to D1 ranges from 0.6 to 1.2, so that the excessive or insufficient diameter of the second projection 44 is avoided while ensuring that the thickened region is not liable to be arched, the increase in material cost due to the excessive diameter of the second projection 44 is prevented, or the effect of the excessive or insufficient diameter of the second projection 44 on the reduction of the arched region is not noticeable.

As shown in fig. 3 and 5, the end of the first protruding portion 42 away from the concave portion body 212 has an outer edge abutting against the groove wall of the first groove 211, the outer edge forming a first measuring portion, and the notch edge of the avoidance groove 7 forming a second measuring portion. Defining the shortest distance between the first measuring part and the second measuring part as L, wherein the height of the cover plate 2 in the thickness direction of the cover plate 2 is T, and the L is the same as the measurement unit of T; wherein the ratio of L to T is in the range of 0.9-1.1. According to the embodiment, the ratio of L to T is designed, so that on one hand, the sealing member 4 and the sealing nail 5 are prevented from being welded, on the other hand, the thickness of the area where the sealing member 4 can be welded is also prevented from being too small, the aggravation of the effect of the heat influence of welding is avoided, and deformation is not easy to generate so as to prevent poor welding. Here, the thickness of the region where the sealing member 4 can be welded is not the thickness of the sealing member 4 in the thickness direction of the cover plate 2, but the length of L.

It should be noted that, for convenience of description of the distance of L, the outer edge of the first protruding portion 42 in the present embodiment refers to only the outer edge of the upper end face of the first protruding portion 42, but this does not mean that the first protruding portion 42 is only welded to the groove wall of the first groove 211, and the entire outer peripheral surface of the first protruding portion 42 may be used to be welded to the groove wall of the first groove 211.

As shown in fig. 3 and 5, the height of the avoiding groove 7 in the thickness direction of the cover plate 2 is defined as h2, and the measurement units of h2 and h1 are the same; wherein the ratio of h2 to h1 is in the range of 0.1-1 to prevent the interference of the seal nail 5 with the seal member 4 caused by too small depth of the escape groove 7.

It is further preferable that the ratio of h2 to h1 is in the range of 0.2 to 1 to further increase the relative depth of the escape groove 7, avoiding interference of the seal nail 5 with the seal member 4.

Example 2

The cover assembly 11 and other structures in the secondary battery in this embodiment are substantially the same as those in embodiment 1, except that the third protruding portion 6 is integrally formed with the concave portion body 212.

As shown in fig. 6 to 8, the third protrusion 6 in the present embodiment is integrally formed with the concave body 212, the third protrusion 6 is part of the concave body 212, and the seal body 41 abuts against the third protrusion 6 to form the escape groove 7. The end of the first protrusion 42 away from the recess body 212 has an outer edge abutting against the groove wall of the first groove 211, the outer edge forming a first measuring site, and the outer edge of the end of the sealing body 41 facing the recess body 212 forming a second measuring site. Defining the shortest distance between the first measuring part and the second measuring part as L, wherein the height of the cover plate 2 in the thickness direction of the cover plate 2 is T, and the L is the same as the measurement unit of T; wherein the ratio of L to T is in the range of 0.9-1.1. According to the embodiment, the ratio of L to T is designed, so that on one hand, the sealing member 4 and the sealing nail 5 are prevented from being welded, on the other hand, the thickness of the area where the sealing member 4 can be welded is also prevented from being too small, the aggravation of the effect of the heat influence of welding is avoided, and deformation is not easy to generate so as to prevent poor welding.

It should be noted that, for convenience of describing the distance of L, the outer edge of the first protruding portion 42 in this embodiment refers to only the outer edge of the upper end surface of the first protruding portion 42, and the outer edge of the sealing body 41 refers to only the outer edge of the lower end surface of the sealing body 41. However, this does not mean that only this position of the first projection 42 is welded to the wall of the first recess 211, and the entire outer peripheral surface of the first projection 42 is available for welding to the wall of the first recess 211.

Further, the height H1 of the first projecting portion 42 in the thickness direction of the lid plate 2, the height H1 of the first recess 211 in the thickness direction of the lid plate 2, the sum H2 of the heights of the second projecting portion 44 and the seal body 41 in the thickness direction of the lid plate 2, the diameter D1 of the second projecting portion 44, the aperture D1 of the end of the first recess 211 remote from the concave portion body 212, the height T of the lid plate 2 in the thickness direction of the lid plate 2, the height H2 of the escape groove 7 in the thickness direction of the lid plate 2 in this embodiment are the same as those of embodiment 1 in terms of the distance represented by these symbols and the ratio between the respective values.

Example 3

The present embodiment is based on embodiment 1 or embodiment 2, and the shape of the second projection 44 is further defined.

As shown in fig. 9, the shape of the second protruding portion 44 in the present embodiment is a cylinder, that is, the cross-sectional shape of the second protruding portion 44 in the horizontal plane is a circle, and the diameter D1 of the second protruding portion 44 is the diameter of the circle.

Further, the upper end of the second protruding portion 44 is further provided with a positioning groove 8, and the positioning groove 8 is arranged in the center of the second protruding portion 44, so that the sealing member 4 can be conveniently and rapidly positioned during processing, automatic production is realized, and production efficiency is improved.

Example 4

The present embodiment is based on embodiment 1 or embodiment 2, and the shape of the second projection 44 is further defined.

As shown in fig. 10, the second protruding portion 44 in this embodiment is rectangular, that is, the cross-sectional shape of the second protruding portion 44 in the horizontal plane is rectangular, and the diameter D1 of the second protruding portion 44 is the distance between two opposite sides of the rectangle. The rectangle in this embodiment is not a conventional rectangle, but is a circular arc transition at the corners of four sides.

Further, the upper end of the second protruding portion 44 is further provided with a positioning groove 8, and the positioning groove 8 is arranged in the center of the second protruding portion 44, so that the sealing member 4 can be conveniently and rapidly positioned during processing, automatic production is realized, and production efficiency is improved.

Example 5

The present embodiment is based on embodiment 1 or embodiment 2, and the shape of the second projection 44 is further defined.

As shown in fig. 11, the second projecting portion 44 in the present embodiment has a triangular prism shape, that is, the cross-sectional shape of the second projecting portion 44 in the horizontal plane is triangular. The cross-sectional shape of the second protruding portion 44 on the horizontal plane in this embodiment is an equilateral triangle, and the intersection point of the three perpendicular lines is located at the center of the sealing member 4, and the diameter D1 of the second protruding portion 44 is the length of the sectioned portion of the second protruding portion 44 when the section is taken along the center of the sealing member 4. Fig. 11 is only a schematic view, and illustrates a distance representation of the diameter D1 of the second protrusion 44, and in other alternative embodiments, the diameter D1 of the second protrusion 44 may also refer to a distance between other positions, depending on the actual situation.

Further, the upper end of the second protruding portion 44 is further provided with a positioning groove 8, and the positioning groove 8 is arranged in the center of the second protruding portion 44, so that the sealing member 4 can be conveniently and rapidly positioned during processing, automatic production is realized, and production efficiency is improved.

Example 6

This embodiment is based on any one of embodiment 1 to embodiment 5, and the shape of the second projection 44 is further defined.

The cover assembly 11 and other structures in the secondary battery in this embodiment are substantially the same as any one of embodiments 1 to 5, except that:

as shown in fig. 12, one end surface of the second projecting portion 44 away from the seal body 41 is a curved surface projecting toward the outside of the second projecting portion 44, that is, the second projecting portion 44 is thicker in the middle and thinner at both ends. The above arrangement makes the deformation doming less likely to occur, since the doming is more serious the closer the sealing member 4 is to the center, the thicker the sealing member 4 is to the center area.

Example 7

The present embodiment is based on embodiment 1 or embodiment 2, and the shape of the second projection 44 is further defined.

As shown in fig. 13 and 14, the second protruding portion 44 in this embodiment is a circular tube, that is, the cross-sectional shape of the second protruding portion 44 in the horizontal plane is a circular ring shape, and the diameter D1 of the second protruding portion 44 is the outer diameter of the circular ring shape.

Further, the upper end of the sealing body 41 is further provided with a positioning groove 8, the positioning groove 8 is arranged in the center of the sealing body 41, and the hollow part of the second protruding part 44 is aimed at, so that the sealing member 4 can be conveniently and rapidly positioned during processing, automatic production is realized, and the production efficiency is improved.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, are based on the orientation or positional relationship of the devices or components as shown in the drawings, merely to facilitate describing the present utility model and simplifying the description, and do not indicate or imply that the devices or components referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

While specific embodiments of the utility model have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the utility model is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the utility model, but such changes and modifications are intended to be within the scope of the utility model.

Claims (16)

1. A cover plate assembly of a battery is characterized by comprising a cover plate, a liquid injection hole and a sealing component;

the cover plate is provided with a concave part recessed along the thickness direction of the cover plate, and the concave part sequentially comprises a first groove and a concave part body along the thickness direction of the cover plate;

the liquid injection hole is arranged on the concave body, and two ends of the liquid injection hole in the thickness direction of the cover plate penetrate through the concave body;

the sealing member is accommodated in the first groove, and is abutted against one end face of the concave part body, which faces the first groove; the sealing member comprises a sealing body, a first protruding portion and a second groove, wherein the first protruding portion protrudes from the outer circumferential surface of the sealing body to a direction away from the sealing body, the first protruding portion is abutted with the groove wall of the first groove, and the first protruding portion faces towards one end surface of the concave portion body and the outer circumferential surface of the sealing body to form the second groove.

2. The battery cover assembly of claim 1, wherein a height of the first protrusion in a thickness direction of the cover is defined as H1, a height of the first groove in the thickness direction of the cover is defined as H1, and measurement units of H1 and H1 are the same; wherein the ratio of H1 to H1 ranges from 0.02 to 1.

3. The battery cover assembly of claim 2, wherein the ratio of H1 to H1 ranges from 0.25 to 0.8.

4. The battery cover assembly of claim 1, wherein the sealing member further comprises a second protrusion protruding from an end of the sealing body remote from the recess body in a direction away from the sealing body.

5. The battery cover assembly of claim 4, wherein a sum of heights of the second protrusion and the sealing body in a thickness direction of the cover is defined as H2, and a height of the first protrusion in the thickness direction of the cover is defined as H1, and measurement units of H1 and H2 are the same; wherein H1 is less than or equal to H2.

6. The battery cover assembly of claim 5, wherein H1 < H2.

7. The battery cover assembly of claim 4, wherein a sum of heights of the second protrusion and the sealing body in a thickness direction of the cover is defined as H2, a height of the first groove in the thickness direction of the cover is defined as H1, and measurement units of H2 and H1 are the same; wherein the ratio of H2 to H1 ranges from 0.2 to 9.

8. The battery cover assembly of claim 7, wherein the ratio of H2 to H1 is in the range of 0.5-2.

9. The battery cover assembly of claim 4, wherein the diameter defining the second projection is D1, the aperture of the end of the first recess distal from the recess body is D1, and the D1 and D1 are the same unit of measure; wherein the ratio of D1 to D1 is in the range of 0.01-3.

10. The battery cover assembly of claim 9, wherein the ratio of D1 to D1 ranges from 0.6 to 1.2.

11. The battery cover assembly of claim 4, wherein the second protrusion has any one of a cylinder, a rectangular parallelepiped, a triangular prism, and a circular tube;

and/or, an end surface of the second protruding part far away from the sealing body is a plane or a curved surface protruding towards the outer part of the second protruding part.

12. The battery cover plate assembly according to any one of claims 1 to 11, further comprising a third protruding portion and an escape groove, wherein two ends of the third protruding portion in the thickness direction of the cover plate are respectively connected with the sealing body and the concave portion body, one end face of the sealing body, which faces the concave portion body, and the third protruding portion enclose the escape groove, a notch of the escape groove faces the concave portion body, and projections of the liquid injection holes on the escape groove in the thickness direction of the cover plate are all located in the escape groove.

13. The battery cover assembly of claim 12, wherein the third tab is integrally formed with the seal body; or, the third protruding portion and the concave portion body are integrally formed.

14. The battery cover assembly of claim 13, wherein when the third protrusion is integrally formed with the sealing body, an end of the first protrusion remote from the recess body has an outer edge abutting a groove wall of the first groove, the outer edge forming a first measurement site, and a notch edge of the relief groove forming a second measurement site; defining the shortest distance between the first measuring part and the second measuring part as L, wherein the height of the cover plate in the thickness direction of the cover plate is T, and the L is the same as the measurement unit of T; wherein the ratio of L to T is in the range of 0.9-1.1;

or when the third protruding part and the concave part body are integrally formed, one end of the first protruding part far away from the concave part body is provided with an outer edge which is abutted with the groove wall of the first groove, the outer edge forms a first measuring part, and the outer edge of the sealing body facing one end of the concave part body forms a second measuring part; defining the shortest distance between the first measuring part and the second measuring part as L, wherein the height of the cover plate in the thickness direction of the cover plate is T, and the L is the same as the measurement unit of T; wherein the ratio of L to T is in the range of 0.9-1.1.

15. The battery cover assembly of claim 12, wherein a height of the first recess in a thickness direction of the cover is defined as h1, a height of the relief groove in the thickness direction of the cover is defined as h2, and measurement units of h1 and h2 are the same; wherein the ratio of h2 to h1 ranges from 0.1 to 1.

16. The battery cover assembly of claim 15, wherein the ratio of h2 to h1 ranges from 0.2 to 1.