CN209993626U - Secondary battery top cover - Google Patents

Abstract

The utility model provides a secondary battery top cap, include: the top cover plate and set up in the first electrode unit and the second electrode unit of top cover plate, the top cover plate has first electrode hole, first electrode unit includes first terminal and first connecting portion, first terminal is located the upper portion of top cover plate and is insulated with the top cover plate by first insulating part, first connecting portion wear to establish first electrode hole and with first terminal fixed connection, first connecting portion enclose and are equipped with the sealing member, the sealing member is between first connecting portion and top cover plate, first terminal below is equipped with encloses and establishes first connecting portion and from the top to the pressurization piece that the sealing member was exerted pressure. The utility model discloses a secondary battery top cap has higher connection reliability, convenience and security, and the piece that adds the pressure simultaneously can produce stronger compressive force so that the sealed effect of sealing member is better to the sealing member, can effectually avoid the secondary battery top cap when the assembly sealing member by the extrusion and get into in the space between first connecting portion and the roof-top piece and influence its sealed effect itself.

Description

Secondary battery top cover

Technical Field

The utility model relates to an energy storage apparatus field especially relates to a secondary battery top cap.

Background

In modern society, driving power sources for more and more electric tools and new energy vehicles are developed in a direction of high capacity and high safety, and batteries are widely used in electric tools and new energy vehicles due to their excellent characteristics such as high capacity. These batteries should have good safety in addition to high capacity to meet the standards of use and to meet the needs of people.

General secondary battery, the negative pole end needs to satisfy with the electrical insulation of top cap and casing, therefore can set up numerous insulating assemblies, if go up plastic part with negative pole post and top cap insulation, arrange the sealing member that carries out electrical insulation and sealed in the negative pole mounting hole in, and carry out electrical insulation's lower plastic part with negative pole connection piece and top cap, these subassemblies are when carrying out the installation of top cap piece negative pole end, in order to control its gas tightness strictly, the required precision of its installation is very high, both carry out the pre-compaction to the sealing member, clearance between each part of will strictly controlling again, therefore with high costs and yields are low. When the secondary battery top cover is welded and assembled with the connecting sheet connected with the battery core pole piece, the sealing element is frequently deformed and extruded into the gap when being pressed, so that the sealing effect is lost, and finally, the sealing performance of the secondary battery top cover is poor.

Therefore, it is urgently needed to provide a new top cover structure to solve the above-mentioned problem of the reduction of the sealing performance.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a secondary battery top cap to prior art's not enough, its leakproofness that can effectively guarantee the secondary battery top cap when the assembly.

In order to achieve the above object, the utility model provides a secondary battery top cap, include: the top cover plate and set up in the first electrode unit and the second electrode unit of top cover plate, the top cover plate has first electrode hole, first electrode unit includes first terminal and first connecting portion, first terminal is located the upper portion of top cover plate and by first insulating part with the top cover plate is insulating, first connecting portion wear to establish first electrode hole and with first terminal fixed connection, first connecting portion enclose and are equipped with the sealing member, the sealing member between first connecting portion with between the top cover plate, first terminal below is equipped with encloses and establishes first connecting portion and is right from the top the pressurization piece that the sealing member was impressed pressure.

The utility model discloses a secondary battery top cap divide into first terminal and first connecting portion with first electrode unit, and first terminal and top cap piece are kept apart through first insulating part, and first connecting portion pass through the sealing member and keep apart with the top cap piece, just keep apart respectively with the top cap piece through electrode unit's split type structure, can improve reliability, convenience and the security of connecting. Meanwhile, the first terminal is provided with a surrounding part below the first connecting part and is pressed by the sealing part from the upper part, the pressing part can generate stronger compression force on the sealing part to ensure that the sealing effect of the sealing part is better, and the sealing part can be effectively prevented from being extruded when the secondary battery top cover is assembled and entering a gap between the first connecting part and the top cover plate to influence the sealing effect of the secondary battery top cover.

The pressing member is generally a member having a relatively high specific gravity and a relatively high hardness, and may be an insulator or a metal member made of ceramic particles, glass, high-strength plastic, glass fiber, or the like, which can withstand a high strength, and has a higher hardness than the first insulating member injection-molded from a common plastic, and applies a greater pressure, so that the sealing member made of rubber can be effectively pressed due to the gravity.

Further, the seal member has a body portion and a projecting portion formed by extending one end of the body portion upward, and the pressing member abuts against the projecting portion. The main body part mainly has a sealing effect, the bulge part mainly has an insulating and isolating effect, the size of the pressurizing part can be reduced by arranging the bulge part on the sealing element so as to reduce the cost of the pressurizing part, and the integrally formed main body part can be pressurized by pressurizing the bulge part.

Further, the sealing member has a body portion located below the top cover sheet, and the pressure member abuts against the body portion. Furthermore, the first insulating part extends downwards at the first electrode hole to form a first extending part, and the first extending part surrounds the pressure part and is arranged between the pressure part and the top cover plate. The pressurization piece can be longer and wear to establish the space between first connecting portion and the top cap piece and exert pressure to the sealing member, and the first extension that first insulating part formed can strengthen the electric insulation and the isolation effect between first connecting portion and the top cap piece.

Further, first connecting portion are equipped with the platform portion that is located the top cover piece below, platform portion with be equipped with between the top cover piece the sealing member, platform portion supports this body portion, just platform portion keeps away from the border of the one end of first connecting portion in orthographic projection on the top cover piece is located on the bottom surface of top cover piece. The platform portion supports this somatic part, the platform portion that supports this somatic part can produce stronger compressive force to the sealing member and make the sealed effect of sealing member better, and the border that the one end of first connecting portion was kept away from to the platform portion lies in the bottom surface of top cover piece on the orthographic projection of top cover piece, therefore the scope of the atress that the platform portion applyed to the sealing member can cover the lower extreme in space, the pressure is exerted pressure to the sealing member from the upper end to the pressure-applying part, the platform portion supports the sealing member from the below, therefore can effectually avoid the sealing member to be extruded to the space when the assembly and influence its sealed effect itself.

Further, the orthographic projection of the platform part on the top cover plate covers the orthographic projection of the body part on the top cover plate, the lower part of the first connecting part is fixedly connected with a first connecting piece electrically connected with a first pole piece of the secondary battery, and the platform part is positioned above the first connecting piece. Furthermore, a step part is arranged at the lower end of the first connecting part, and the first connecting part is connected with the first connecting piece in an embedded mode through the step part. Furthermore, the upper end of the first connecting portion is riveted and fixed with the first terminal, the lower end of the first connecting portion is provided with a step portion, the first connecting portion is connected with the first connecting piece in an embedded mode through the step portion, the first connecting portion and the first terminal can be connected more firmly through riveting and fixing, the first connecting portion is connected with the first connecting piece in an embedded mode, and the fact that the first connecting piece falls down to affect the connection reliability due to reasons such as shaking in the repeated use process of the secondary battery can be avoided. Or the upper part of the first connecting piece is concave inwards to form a groove, the lower part of the first connecting part is fixed in the groove through laser penetration welding and is fixed through laser penetration welding, but the first connecting part is not provided with a through hole for the first connecting part to penetrate through, so that the connection firmness is stronger.

Further, the orthographic projection of the body part on the top cover plate covers the orthographic projection of the platform part on the top cover plate, the lower part of the first connecting part is fixedly connected with a first connecting part electrically connected with a first pole piece of the secondary battery, the platform part is embedded and connected with the first connecting part, the first connecting part is directly connected through the embedding of the platform part, the whole height size of the secondary battery top cover can be reduced, and the associativity between the first connecting part and the first connecting part can be stronger through an embedding mode. Further, first connecting portion in the below of platform portion still is equipped with step portion, step portion in orthographic projection on the top cover piece covers platform portion in orthographic projection on the top cover piece, first connecting piece card is located step portion can avoid first connecting piece in secondary battery's the repeated use in-process because of rocking etc. reason toward the reliability that the whereabouts influences the connection.

Furthermore, the number of the first connecting portions is two, the number of the first electrode holes is also two, the first insulating part extends downwards at the two first electrode holes to form first extending portions, the first extending portions are connected with the top cover plate in an embedded mode, the overcurrent capacity of the first electrode units can be enhanced through the two first connecting portions, the two first connecting portions can also have the effect of preventing the first electrode units from rotating, the first connecting portions are connected with the top cover plate in an embedded mode through the first extending portions, and the connection firmness of the first connecting portions and the top cover plate can be further enhanced. Furthermore, the first insulating part is further provided with a second extending part between the two first extending parts, the second extending part is connected with the top cover plate in an embedded mode, the anti-rotation effect is further enhanced due to the arrangement of the second extending part, and the connection firmness of the first connecting part and the top cover plate is stronger.

Furthermore, the edge of the first insulating part extends upwards and encloses to be set up to hold the chamber, the first insulating part pass through hold the chamber with first terminal gomphosis is connected, connects through the gomphosis and can make first insulating part be connected more firmly with first terminal, and can also carry out the electrical insulation isolation to the lateral part of first terminal under the prerequisite of make full use of effective space.

Further, first connecting piece has body, kink and connection piece, the body with first connecting portion fixed connection, the one end bending type of body forms the kink, kink downwardly extending forms the electricity and connects the connection piece of first pole piece, the body with be equipped with the second insulating part between the top cap piece, this first connecting piece is applicable to in the M6T (the battery rolls up the core direction perpendicular to utmost point post's the extending direction) secondary battery, adopts this structure can be convenient for be connected between first connecting piece and the pole piece, and the ability of overflowing is strong.

Furthermore, the top cover plate is also provided with a second electrode hole, the second electrode unit comprises a second terminal and a second connecting part, the second terminal is positioned at the upper part of the top cover plate and is insulated from the top cover plate by a first insulating part, the second connecting part penetrates through the second electrode hole and is fixedly connected with the second terminal, the second connecting part is isolated from the top cover plate by a sealing part surrounded by the second connecting part, the lower part of the second connecting part is fixedly connected with a second connecting part, the second connecting part is electrically connected with a second pole piece of the secondary battery, and the fixed connecting position of the second connecting part and the second connecting part is covered by the sealing part.

The utility model discloses an applicable in secondary battery of secondary battery top cap, secondary battery include electric core, hold the casing of electric core and aforementioned secondary battery top cap, and the secondary battery top cap seals the casing.

Drawings

Fig. 1 is a first perspective view of an embodiment of a secondary battery top cap according to the present invention.

Fig. 2 is a second perspective view of an embodiment of a secondary battery top cap according to the present invention.

Fig. 3 is a top view of an embodiment of a secondary battery top cap according to the present invention.

Fig. 4 is a bottom view of an embodiment of a secondary battery top cap according to the present invention.

Fig. 5 is an exploded view of the top cap of the secondary battery of fig. 1 in one direction.

Fig. 6 is an exploded view of the secondary battery top cover of fig. 1 in another direction.

Fig. 7 is a cross-sectional view taken along a-a of fig. 3.

Fig. 8 is an enlarged view of the circled portion in fig. 7.

Fig. 9 is a variation of fig. 8.

Fig. 10 is another variation of fig. 8.

Fig. 11 is a further variation of fig. 8.

Fig. 12 is a further variation of fig. 8.

Fig. 13 is a further variation of fig. 8.

Fig. 14 is a further variation of fig. 8.

Fig. 15 is a further variation of fig. 8.

Description of the element reference numerals

100-secondary battery top cover; 1-top cover sheet; 11/11a/11 b-first electrode aperture; 13/13a/13 b-second electrode aperture; 15-explosion-proof valve fixing hole; 17-a groove; 2-a first electrode unit; 21-a first terminal; 211-upper terminal portion; 213-lower terminal portion; 215-terminal step; 217/217' -riveting holes; 23/23a/23 b-first connection; 231/231' -a platform portion; 233/233' -a step; 3-a second electrode unit; 31-a second terminal; 33/33a/33 b-second connection; 331/331' -a second electrode end platform; 4-liquid injection hole; 5-an explosion-proof valve assembly; 51-explosion-proof valve protective film; 53-explosion-proof valve; 6/6' -a second insulating member; 7-a first connector; 71-a body; 73-a bending part; 75-connecting sheets; 77-the electrode is perforated; 7' -a second connector; 71' -a second connector body; 8/8' -seals; 81-a body portion; 83-a boss; 9/9' -a first insulator; 91-an insulator body; 93-a receiving cavity; 95-perforating holes; 951-a first extension; 97-a second extension; 10-pressing member

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It should be noted that, in general, the secondary battery is placed vertically, one side of the electrode unit of the top cover of the secondary battery, which extends out and is connected with the outside, is an upper side, the other side is a lower side, and the vertical direction is the height direction of the electrode unit.

The utility model discloses an applicable in secondary battery of secondary battery top cap, secondary battery include secondary battery top cap 100, electric core and hold the casing of electric core, annotate the electrolyte that has soaked electric core in the casing, and secondary battery top cap 100 will hold the casing of electric core and electrolyte and seal. Referring to fig. 1 to 7, a secondary battery top cap 100 includes a top cap sheet 1, and a first electrode unit 2, a second electrode unit 3, and an explosion-proof valve assembly 5 provided on the top cap sheet 1. The top cover plate 1 is provided with a liquid injection hole 4, a first electrode hole 11, an explosion-proof valve fixing hole 15 and a second electrode hole 13, the explosion-proof valve component 5 comprises an explosion-proof valve 53 fixed on the explosion-proof valve fixing hole 15, and an explosion-proof valve protective film 51 is arranged on the upper portion of the explosion-proof valve 53.

First, a structure of one end of the first electrode unit 2 is described with reference to fig. 5 to 15, where the first electrode unit 2 includes a first terminal 21 and a first connecting portion 23, the first terminal 21 is located on the top of the top cover plate 1 and is insulated from the top cover plate 1 by the first insulating member 9, the first connecting portion 23 penetrates through the first electrode hole 11 and is fixedly connected to the first terminal 21, the first connecting portion 23 encloses the sealing member 8, the sealing member 8 is located between the first connecting portion 23 and the top cover plate 1, and a pressure member 10 enclosing the first connecting portion 23 and pressing the sealing member 8 from above is located below the first terminal 21. The pressing member 10 can generate a stronger compressive force on the sealing member 8 to make the sealing effect of the sealing member 8 better, and can effectively prevent the sealing member 8 from being pressed into a gap between the first connecting portion 23 and the top cover plate 1 to affect the sealing effect of the secondary battery top cover 100 during assembly.

The sealing member 8 may take various forms, and as shown in fig. 8 to 14, the sealing member 8 has a body portion 81 and a projection portion 83 formed by extending one end of the body portion 81 upward, and the pressing member 10 abuts against the projection portion 83. The main body 81 mainly has a sealing effect, the protrusion 83 mainly has an insulating and isolating effect, the size of the pressing member 10 can be reduced by providing the protrusion 83 on the sealing member 8 to reduce the cost of the pressing member 10, and the integrally molded main body 81 can be pressed by pressing the protrusion 83. In this case, the pressing member 10 is preferably made of an insulator that can withstand high strength, such as ceramic particles, glass, high-strength plastic, and glass fibers. Alternatively, as shown in fig. 15, the pressure member 10 abuts against the main body 81, and the first insulating member 9 extends downward at the first electrode hole 11 to form a first extension portion 951, and the first extension portion 951 encloses the pressure member 10 and is interposed between the pressure member 10 and the top cover sheet 1. The pressure member 10 may be long and penetrate through the gap between the first connection portion 23 and the top cover plate 1 to apply pressure to the sealing member 8, and the first extension portion 951 may enhance the electrical insulation and isolation effect between the first connection portion 23 and the top cover plate 1. The pressing member 10 at this time may be a metal member, and in order to prevent the first connecting portion 23 and the top cover sheet 1 from being short-circuited due to the presence of the pressing member 10, a first extension portion 951 is required between the pressing member 10 and the top cover sheet 1 for insulation.

In order to improve the connection reliability between the components, as shown in fig. 5 to 15, the first connection portions 23 are two, 23a and 23b, the first electrode holes 11 are also two corresponding to 11a and 11b, the first insulator 9 has an insulator body 91, the insulator body 91 has through holes 95 for the first connection portions 23a and 23b to pass through, edges of the through holes 95, namely the two first electrode holes 11a and 11b, extend downward to form first extension portions 951, the first extension portions 951 are connected to the top cover plate 1 in a fitting manner, the two first connection portions 23 can make the overcurrent capacity of the first electrode unit 2 stronger, and two first connecting portions 23 can also produce the effect of preventing the first electrode unit 2 from rotating, and the first connecting portions 23 are connected with the top cover plate 1 through the first extending portions 951 in an embedded manner, so that the connection firmness of the first connecting portions 23 and the top cover plate 1 can be further enhanced. The first insulating member 9 is further provided with a second extending portion 97 between the two first extending portions 951, and the second extending portion 97 is embedded and connected with the top cover plate 1, so that the rotation prevention and the connection firmness are further enhanced. The edge of the insulating member body 91 extends upward and encloses into the accommodating cavity 93, the first insulating member 9 is connected with the first terminal 21 by the accommodating cavity 93 in an embedding manner, the first insulating member 9 and the first terminal 21 can be connected more firmly by the embedding connection, and the side part of the first terminal 21 can be electrically insulated and isolated on the premise of fully utilizing the effective space.

The first terminal 21 has an upper terminal portion 211 and a lower terminal portion 213 connected thereto, the lower terminal portion 213 being smaller in size than the upper terminal portion 211 to form a terminal step portion 215, and the first insulator 9 is fitted into and connected to the terminal step portion 215 through the receiving cavity 93. The upper end of the first connecting portion 23 is riveted with the first terminal 21 through a riveting hole 217/217', the lower end of the first connecting portion 23 is fixedly connected with the first connecting member 7, the first connecting member 7 comprises a body 71, a bending portion 73 and a connecting piece 75, the body 71 is fixedly connected with the first connecting portion 23, one end of the body 71 is bent to form the bending portion 73, the bending portion 73 extends downwards to form the connecting piece 75 electrically connected with the first pole piece, the second insulating member 6 is arranged between the body 71 and the top cover plate 1, the first connecting member 7 is used in the M6T secondary battery, the structure is convenient for connection between the first connecting member 7 and the first pole piece, and the overcurrent capacity is strong.

Unlike fig. 14, in which the first connecting portion 23 of fig. 8-13 is provided with a platform 231/231 ' located below the top cover sheet 1, the sealing member 8 is provided between the platform 231/231 ' and the top cover sheet 1, the platform 231/231 ' supports the body 81, and the orthographic projection of the edge of the end of the platform 231/231 ' away from the first connecting portion 23 on the top cover sheet 1 is located on the bottom surface of the top cover sheet 1 (the orthographic projection of the edge of the end of the platform 231/231 ' away from the first connecting portion 23 on the top cover sheet 1 in fig. 8 and 10 is shown by an arrow). The platform 233/233 'is located at the lower part of the sealing member 8 and supports the sealing member 8, the range of the stress applied by the platform 233/233' to the sealing member 8 can cover the lower end of the gap between the first connecting part 23 and the top cover plate 1, and the sealing effect of the secondary battery top cover 100 can be effectively prevented from being influenced by the fact that the sealing member 8 is extruded into the gap when the secondary battery top cover is assembled. The lower portion of the first connecting portion 23 is fixedly connected to the first connector 7, and the first connector 7 is electrically connected to a first pole piece (not shown) of the secondary battery.

The first connecting portion 23 can have various structures, as shown in fig. 8 to 9, an orthographic projection of the sealing member 8 on the top cover plate 1 covers an orthographic projection of the platform portion 231/231 ' on the top cover plate 1, that is, a horizontal dimension of the sealing member 8 is larger than a horizontal dimension of the platform portion 231/231 ', and the platform portion 231/231 ' is engaged with the first connecting member 7. That is, the body 71 of the first connector 7 is formed with a receiving groove for the platform portion 231/231 'to be inserted, and the first connector 7 is directly fixed by the platform portion 231/231' being fitted, so that the overall height of the secondary battery top cover 100 can be reduced, and the coupling between the first connecting portion 23 and the first connector 7 can be stronger by the fitting manner. In order to avoid the influence of the first connector 7 dropping due to shaking and the like during the repeated use of the secondary battery on the connection reliability, as shown in fig. 8, a step portion 233/233 ' is further provided below the platform portion 231/231 ' of the first connector 23, and the orthographic projection of the step portion 233/233 ' on the top cover piece 1 covers the orthographic projection of the platform portion 231/231 ' on the top cover piece 1, that is, the size of the step portion 233/233 ' in the horizontal direction is larger than that of the platform portion 231/231 ', and the first connector 7 is clamped at the step portion 233/233 '.

The first connecting portion 23 may have other structures, as shown in fig. 10 to 13, an orthographic projection of the platform portion 231/231 ' on the top lid plate 1 covers the sealing element 8, that is, a horizontal dimension of the platform portion 231/231 ' is larger than a horizontal dimension of the sealing element 8, the platform portion 231/231 ' is located above the first connecting element 7, a lower portion of the first connecting portion 23 is fixedly connected to the first connecting element 7, and a lower end of the first connecting portion 23 can be connected to the first connecting element 7 in an embedded manner and then laser-welded, so that laser welding can be performed more stably, firmness after fixation is better, and in order to increase a laser welding area, a lower portion of the first connecting portion 23 may be in a horn shape as shown in fig. 11. As shown in fig. 12, the upper end of the first connection portion 23 is riveted to the first terminal 21, the lower end of the first connection portion 23 is provided with a step portion 233/233 ', the first connection portion 23 is connected to the first connection member 7 through the step portion 233/233', the first connection portion 23 and the first terminal 21 can be connected more firmly through riveting, and the first connection portion 23 is connected to the first connection member 7 in an embedded manner, so that the first connection member 7 is prevented from falling down due to shaking and other reasons during repeated use of the secondary battery, which affects the connection reliability. Or, as further shown in fig. 13, the upper portion of the first connecting member 7 is recessed to form a groove (not shown), the lower portion of the first connecting portion 23 is fixed to the groove by laser penetration welding, and is fixed by laser penetration welding, but the first connecting member 7 is not provided with a through hole for the first connecting portion 23 to penetrate, so that the connection reliability is stronger.

The second electrode unit 3 may be similar to the first electrode unit 1, and includes a second terminal 31 and a second connecting portion 33, the second terminal 31 is located on the top of the top cover 1 and is insulated from the top cover 1 by the first insulating member 9 ', the second connecting portion 33 penetrates through the second electrode hole 13 and is fixedly connected to the second terminal 31, the second connecting portion 33 encloses the sealing member 8 ', the sealing member 8 ' is located between the second connecting portion 33 and the top cover 1, and a pressing member 10 ' enclosing the second connecting portion 33 and pressing the upper side of the sealing member 8 ' is located below the second terminal 31. The pressing member 10 'can generate a stronger compression force on the sealing member 8' to make the sealing effect of the sealing member 8 'better, and can effectively prevent the sealing member 8' from being pressed into the gap between the second connecting portion 33 and the top lid member 1 to affect the sealing effect of the secondary battery top lid 100 during assembly. In order to enhance the connection reliability between the components, similarly, there are two second connection portions 33, 33a and 33b, and the second electrode holes 13 are also two corresponding second electrode holes 13a and 13b, and the second connection portions 33a and 33b are both inserted through the sealing member 8' and fixed to the second electrode holes 13a and 13 b.

The first electrode unit of the present invention can be referred to as an anode unit or a cathode unit, and correspondingly, the second electrode unit can be referred to as an anode unit or a cathode unit, specifically, when the first electrode unit is the anode unit, the second electrode unit is the cathode unit; when the first electrode unit is a negative electrode unit, the second electrode unit is a positive electrode unit. In the embodiment shown in fig. 7, the first electrode unit 2 is taken as a positive electrode unit, the second electrode unit 3 is taken as a negative electrode unit, the connecting part and the connecting member of the negative electrode unit are usually made of copper, the connecting part and the connecting member of the positive electrode unit are usually made of aluminum, and the overcurrent capacity of copper is strong, so that the height of the lower end of the first connecting part 23 of the positive electrode unit end embedded with the first connecting member 7 is larger than the height of the lower end of the second connecting part 33 of the negative electrode unit end embedded with the second connecting member 7 ', and the height of the body 71 of the connecting member 7 is larger than the height of the body 71' of the second connecting member.

It should be noted that, in order to solve the problems of overcharge and puncture of the secondary battery during the use of the secondary battery, the positive electrode unit and the top cover sheet are usually electrically conducted to form an external short circuit, so that the first electrode unit 2 can be set as a negative electrode unit, and the second electrode unit 3 is a positive electrode unit, both of which are similar in structure, but in order to achieve the electrical conduction of the positive electrode unit to the top cover sheet, the first insulating member 9' can be injection molded by injection molding material added with conductive particles, and the conductive particles can be conductive carbon or conductive metal. Of course, in order to simplify the process, the positive electrode unit may also have a structure including only a positive electrode terminal, and the positive electrode terminal is welded and fixed to the top cover sheet 1 or is formed by protruding the top cover sheet 1 in a direction away from the battery core.

It should be noted that the above-mentioned embodiments illustrate rather than limit the scope of the invention, and that modifications of various equivalent forms of the invention, which may occur to those skilled in the art after reading the present application, fall within the scope of the appended claims.

Claims (10)

1. A secondary battery top cap, comprising: the electrode structure comprises a top cover plate, a first electrode unit and a second electrode unit, wherein the first electrode unit and the second electrode unit are arranged on the top cover plate, the top cover plate is provided with a first electrode hole, the electrode structure is characterized in that the first electrode unit comprises a first terminal and a first connecting part, the first terminal is positioned on the upper portion of the top cover plate and is insulated from the top cover plate by a first insulating part, the first connecting part penetrates through the first electrode hole and is fixedly connected with the first terminal, a sealing part is arranged around the first connecting part, the sealing part is arranged between the first connecting part and the top cover plate, and a pressurizing part which is arranged below the first terminal and used for enclosing the first connecting part and pressurizing the sealing part from the top is arranged.

2. The secondary battery top cap according to claim 1, wherein the sealing member has a body portion and a protrusion portion formed by extending one end of the body portion upward, and the pressing member abuts against the protrusion portion.

3. The secondary battery top cap according to claim 1, wherein the sealing member has a body portion located below the top cap sheet, and the pressure member abuts the body portion.

4. The secondary battery top cap according to claim 3, wherein the first insulating member extends downward at the first electrode hole to form a first extension portion, and the first extension portion surrounds the pressing member and is interposed between the pressing member and the top cap sheet.

5. The secondary battery top cover according to any one of claims 2 to 4, wherein the first connecting portion is provided with a platform portion located below the top cover sheet, the sealing member is provided between the platform portion and the top cover sheet, the body portion is supported by the platform portion, and an orthographic projection of an edge of one end of the platform portion, which is far away from the first connecting portion, on the top cover sheet is located on a bottom surface of the top cover sheet.

6. The secondary battery top cap of claim 5, wherein an orthographic projection of the platform portion on the top cap piece covers an orthographic projection of the body portion on the top cap piece, a lower portion of the first connection portion is fixedly connected with a first connection piece electrically connected with a first pole piece of a secondary battery, and the platform portion is located above the first connection piece.

7. The secondary battery top cap according to claim 6, wherein the lower end of the first connection part is provided with a stepped part through which the first connection part is fitted and connected to the first connection part, or the upper part of the first connection part is recessed to form a groove to which the lower part of the first connection part is fixed by laser penetration welding.

8. The secondary battery top cap of claim 5, wherein an orthographic projection of the body portion on the top cap piece covers an orthographic projection of the platform portion on the top cap piece, a lower portion of the first connection portion is fixedly connected with a first connection piece electrically connected with a first pole piece of a secondary battery, and the platform portion is connected to the first connection piece in an embedded manner.

9. The secondary battery top cover according to claim 8, wherein the first connecting part is further provided with a step part below the platform part, an orthographic projection of the step part on the top cover plate covers an orthographic projection of the platform part on the top cover plate, and the first connecting part is clamped on the step part.

10. The secondary battery top cap according to claim 1, wherein the number of the first connecting portions is two, the number of the first electrode holes is two, the first insulating member extends downward at both the two first electrode holes to form a first extending portion, the first extending portion is connected with the top cap piece in an embedded manner, a second extending portion is further disposed between the two first extending portions, and the second extending portion is connected with the top cap piece in an embedded manner.

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