阅读说明：本技术 一种复合极柱、顶盖和电池 (Composite pole, top cover and battery ) 是由 陈圣立 邹武元 姜斌 吴志康 周贤 于 2021-09-09 设计创作，主要内容包括：本发明公开了一种复合极柱、顶盖和电池,涉及电池技术领域；复合极柱包括内极柱和外极柱；内极柱设置有第一配合部；外极柱设置有与第一配合部配合的第二配合部；第一配合部和第二配合部二者中的一者为凹陷槽,第一配合部和第二配合部二者中的另一者为凸起,当第一配合部与第二配合部配合时,凸起的周向边缘与凹陷槽的槽内壁周向边缘贴合,凸起的端面与凹陷槽的槽底贴合。一方面,该极柱无需采用焊接方式连接,不存在虚焊,仅需采用冲压等方式将凹陷槽与凸起配合即可,具有配合方式简单、可靠且成本低的优点；另一方面,凹陷槽能与凸起形成紧密贴合的复合结构,还可能保证极柱的刚度、导电性和气密性,从而保证极柱质量、使用性能和安全性能。(The invention discloses a composite pole, a top cover and a battery, and relates to the technical field of batteries; the composite pole comprises an inner pole and an outer pole; the inner pole is provided with a first matching part; the outer pole is provided with a second matching part matched with the first matching part; one of the first matching part and the second matching part is a concave groove, the other of the first matching part and the second matching part is a protrusion, when the first matching part is matched with the second matching part, the circumferential edge of the protrusion is attached to the circumferential edge of the inner wall of the concave groove, and the end face of the protrusion is attached to the bottom of the concave groove. On one hand, the pole does not need to be connected in a welding mode, cold welding does not exist, the concave groove and the protrusion only need to be matched in a stamping mode and the like, and the pole has the advantages of simple and reliable matching mode and low cost; on the other hand, the sunken groove can form the composite construction of closely laminating with the arch, still can guarantee the rigidity, electric conductivity and the gas tightness of utmost point post to guarantee utmost point post quality, performance and security performance.)

1. A composite pole, comprising:

the inner pole is provided with a first matching part;

the outer pole is provided with a second matching part matched with the first matching part;

first cooperation portion with one of the two of second cooperation portion is the depressed groove, first cooperation portion with another one of the two of second cooperation portion is the arch, works as first cooperation portion with during the cooperation of second cooperation portion, bellied circumference edge with the laminating of inslot wall circumference edge of depressed groove, bellied terminal surface with the tank bottom laminating of depressed groove.

2. The composite post according to claim 1, characterized in that:

the interior utmost point post has utmost point post boss, first cooperation portion for set up in the undercut of the mesa roof of utmost point post boss, the undercut of undercut with the protruding opposite direction of utmost point post boss, just the sunken degree of depth of undercut is less than or equal to the protruding height of utmost point post boss, the second cooperation portion is protruding.

3. The composite post according to claim 1, characterized in that:

the inner pole comprises a first pole body and a pole boss which is convexly arranged on the first pole body, and the first matching part is arranged on the pole boss; the outer pole comprises a second pole body, the second matching portion is arranged on the second pole body, and when the concave groove is matched with the protrusion, the second pole body is attached to the first pole body.

4. The composite post according to claim 1, characterized in that:

the number of the first matching parts is multiple, and the number of the second matching parts is matched with that of the first matching parts, so that the second matching parts are matched with the first matching parts in a one-to-one correspondence mode.

5. The composite post according to claim 1, characterized in that:

the composite pole further comprises a conducting layer, and the conducting layer is arranged between the first matching portion and the second matching portion.

6. A header, comprising:

the top cover plate is provided with a mounting hole;

the composite pole of any one of claims 1 to 5, inserted into the mounting hole and protruding therefrom.

7. The overcap of claim 6, wherein:

the top cover comprises a sealing ring, the sealing ring is sleeved outside the composite pole and is used for simultaneously and hermetically connecting the inner pole and the inner wall of the mounting hole, and the outer pole and the inner wall of the mounting hole;

alternatively, the first and second electrodes may be,

the top cover comprises a sealing ring and an insulating limit part, and the sealing ring is arranged between the inner pole and the inner wall of the mounting hole and used for sealing and connecting the inner pole and the inner wall of the mounting hole; the insulating limiting part is arranged between the outer pole and the inner wall of the mounting hole and used for limiting the position of the outer pole relative to the top cover.

8. The overcap of claim 7, wherein:

the top cover comprises a sealing ring and an insulating limit piece; the inner pole comprises a first pole body and a pole boss which is convexly arranged on the first pole body, and the sealing ring is sleeved outside the pole boss and is used for being in sealing fit with the inner wall of the mounting hole; the insulating locating part is provided with an inner ring groove and an outer ring groove, the cover plate further comprises an annular protrusion located on the edge of the inner wall of the mounting hole, the outer pole column is connected with the inner ring groove in an inserting mode, and the annular protrusion is connected with the outer ring groove in an inserting mode.

9. The overcap of claim 6, wherein:

the top cover plate is provided with two mounting holes, the top cover comprises two composite poles, one composite pole is a cathode pole, the other composite pole is an anode pole, and the cathode pole and the anode pole are respectively mounted at the corresponding mounting holes; the inner pole of the cathode pole is made of copper or aluminum, and the outer pole of the cathode pole is made of aluminum; the material of the inner pole and the outer pole of the anode pole is aluminum.

10. The overcap of claim 6, wherein:

the top cover further comprises a flow converging sheet, and the flow converging sheet and the inner pole of the composite pole are integrally formed and are attached to the side wall of the top cover plate.

11. A battery, comprising:

the composite pole of any one of claims 1 to 5; or, the overcap of any one of claims 6 to 10.

Technical Field

The invention relates to the technical field of batteries, in particular to a composite pole, a top cover and a battery.

Background

In lithium ion power battery technical field, utmost point post is the inside and outside part of intercommunication battery, and the one end and the inside electric core of battery of utmost point post are connected, and the other end is connected with the circuit of the outside consumer of battery to make the battery can supply power for outside consumer, also can realize charging of self. Simultaneously, because the negative pole post of battery adopts the copper material usually, and the copper material is more expensive, therefore in order to practice thrift the cost, the part of being connected the inside of utmost point post and electric core keeps original copper material usually to guarantee the performance of battery, and the part of being connected the outside of utmost point post and consumer sets up to the aluminium material that the cost is lower relatively, and copper material and aluminium material adopt friction weld's mode cooperation to be connected, in order to form and to guarantee battery performance, the compound utmost point post that the cost is lower relatively again.

However, in the prior art, the composite pole connected by the friction welding method has high processing cost, and is easy to produce insufficient welding in the welding process, which affects the quality and safety performance of the power battery.

Disclosure of Invention

The invention aims to provide a composite pole which is simple and reliable in matching mode and low in cost, and can effectively ensure the quality, the service performance and the safety performance of a battery.

Another object of the present invention is to provide a cap and a battery, which include the above composite post. Therefore, the method also has the advantages of low cost, good performance and high quality.

The embodiment of the invention is realized by the following steps:

in a first aspect, the present invention provides a composite pole, comprising:

the inner pole is provided with a first matching part;

the outer pole is provided with a second matching part matched with the first matching part;

one of the first matching part and the second matching part is a concave groove, the other of the first matching part and the second matching part is a protrusion, when the first matching part is matched with the second matching part, the circumferential edge of the protrusion is attached to the circumferential edge of the inner wall of the concave groove, and the end face of the protrusion is attached to the bottom of the concave groove.

In an optional embodiment, the inner pole has a pole boss, the first fitting portion is a recessed groove formed in a top wall of the pole boss, a recessed direction of the recessed groove is opposite to a protruding direction of the pole boss, a recessed depth of the recessed groove is smaller than or equal to a protruding height of the pole boss, and the second fitting portion is protruding.

In an optional embodiment, the inner pole comprises a first pole body and a pole boss protruding from the first pole body, and the first fitting part is arranged on the pole boss; the outer pole comprises a second pole body, the second matching portion is arranged on the second pole body, and when the concave groove and the protrusion are matched, the second pole body is attached to the first pole body.

In an alternative embodiment, the number of the first matching parts is multiple, and the number of the second matching parts is matched with the number of the first matching parts, so that the multiple second matching parts are matched with the multiple first matching parts in a one-to-one correspondence manner.

In an optional embodiment, the composite post further includes a conductive layer, and the conductive layer is disposed between the first mating portion and the second mating portion.

In a second aspect, the present invention provides a top cover comprising:

the top cover plate is provided with a mounting hole;

the composite pole of any one of the preceding embodiments, wherein the composite pole is inserted into the mounting hole and extends out of the mounting hole.

In an optional embodiment, the top cover comprises a sealing ring, and the sealing ring is sleeved outside the composite pole and is used for simultaneously and hermetically connecting the inner pole and the inner wall of the mounting hole, and the outer pole and the inner wall of the mounting hole;

alternatively, the first and second electrodes may be,

the top cover comprises a sealing ring and an insulating limit part, and the sealing ring is arranged between the inner pole and the inner wall of the mounting hole and used for sealing and connecting the inner pole and the inner wall of the mounting hole; the insulating limiting part is arranged between the outer pole and the inner wall of the mounting hole and used for limiting the position of the outer pole relative to the top cover.

In an alternative embodiment, the top cap includes a seal ring and an insulating stopper; the inner pole comprises a first pole body and a pole boss which is convexly arranged on the first pole body, and the sealing ring is sleeved outside the pole boss and is used for being in sealing fit with the inner wall of the mounting hole; the insulating locating part is provided with an inner ring groove and an outer ring groove, the cover plate further comprises an annular protrusion located on the edge of the inner wall of the mounting hole, the outer pole column is connected with the inner ring groove in an inserting mode, and the annular protrusion is connected with the outer ring groove in an inserting mode.

In an optional embodiment, the top cover plate is provided with two mounting holes, the top cover comprises two composite poles, one composite pole is a cathode pole, the other composite pole is an anode pole, and the cathode pole and the anode pole are respectively mounted at the corresponding mounting holes; the inner pole of the cathode pole is made of copper or aluminum, and the outer pole of the cathode pole is made of aluminum; the material of the inner pole and the outer pole of the anode pole is aluminum.

In an optional embodiment, the top cover further includes a converging sheet, and the converging sheet is integrally formed with the inner pole of the composite pole and attached to the side wall of the top cover plate.

In a third aspect, the present invention provides a battery comprising:

the composite pole of any of the preceding embodiments; alternatively, the overcap of any one of the preceding embodiments.

The embodiment of the invention has at least the following advantages or beneficial effects:

the embodiment of the invention provides a composite pole, which comprises an inner pole and an outer pole; the inner pole is provided with a first matching part; the outer pole is provided with a second matching part matched with the first matching part; one of the first matching part and the second matching part is a concave groove, the other of the first matching part and the second matching part is a protrusion, when the first matching part is matched with the second matching part, the circumferential edge of the protrusion is attached to the circumferential edge of the inner wall of the concave groove, and the end face of the protrusion is attached to the bottom of the concave groove. On one hand, the composite pole does not need to be connected in a welding mode, the problem of insufficient soldering is avoided, the concave groove and the protrusion only need to be matched in a stamping mode and the like, and the composite pole has the advantages of simple and reliable matching mode and low cost; on the other hand, in the composite structure formed by matching the concave groove and the protrusion, the circumferential direction of the inner wall of the concave groove is tightly attached to the circumferential direction of the protrusion, and the protruding end face is also tightly attached to the groove bottom of the concave groove, so that the rigidity of the composite pole column can be ensured, the conductivity and the air tightness of the composite pole column can be ensured, and the quality, the use performance and the safety performance of the composite pole column can be effectively ensured.

The embodiment of the invention also provides a top cover and a battery, which comprise the composite pole. Therefore, the method also has the advantages of low cost, good performance and high quality.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a top cover according to an embodiment of the present invention;

FIG. 2 is a schematic partial cross-sectional view of a top lid according to an embodiment of the present invention;

FIG. 3 is a partially exploded view of a top lid according to an embodiment of the present invention;

fig. 4 is a partial structural schematic view of a top cover according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of another top cover provided in the embodiment of the present invention;

FIG. 6 is a schematic partial cross-sectional view of another overcap provided in accordance with an embodiment of the present invention;

FIG. 7 is a partially exploded view of another alternative overcap provided in accordance with an embodiment of the present invention;

fig. 8 is a partial structural schematic view of another top cover according to an embodiment of the present invention.

Icon 100-top cover; 101-a top cover plate; 103-mounting holes; 104-a composite pole; 105-an inner pole; 107-outer pole; 109-a cover body; 111-plastic body; 113-a first pole body; 115-pole boss; 117-second pole body; 119-a receiving groove; 121-a first mating portion; 123-a second mating portion; 125-sealing ring; 127-an insulating limit; 129-inner ring groove; 131-outer ring groove; 133-bus piece; 135-annular protrusion.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the correlation technique, the inner pole and the outer pole of the composite pole of the battery are usually matched in a friction welding mode, and the friction welding connection between the inner pole and the outer pole is easy to cause insufficient welding in the welding process, so that the problems of pole falling and the like are easy to occur, and the quality and the safety performance of the power battery are influenced. In view of this, the present embodiment provides a battery, in which the inner terminal and the outer terminal of the composite terminal can be connected in a matching manner through the matching portion, and the connection in a welding manner can be avoided, so that the problem of insufficient solder can be avoided. The structure of the battery will be described in detail below.

Fig. 1 is a schematic structural diagram of a top cover 100 according to this embodiment. Referring to fig. 1, the present embodiment provides a battery, which includes a casing (not shown), a battery cell (not shown), and a top cover 100. The casing is a hollow square structure with an opening at one end, the battery cell is arranged inside the casing, and the top cover 100 is arranged at the opening of the casing and is electrically connected with the battery cell.

In detail, referring to fig. 1 again, in the present embodiment, the top cover 100 specifically includes a top cover plate 101 and a composite post 104. Wherein, two mounting holes 103 have been seted up on the top shroud 101, the quantity of compound utmost point post 104 is two, and one is negative pole post, another is positive pole post, negative pole post is pegged graft with the mounting hole 103 that corresponds the position, and stretch out from mounting hole 103, the inboard that is close to electric core of negative pole post is connected with the negative pole utmost point ear electricity of electric core, the part that negative pole post stretches out from mounting hole 103 is used for being connected with the negative pole of outside consumer, positive pole post also pegs graft with the mounting hole 103 that corresponds the position, and stretch out from mounting hole 103, the inboard that is close to electric core of positive pole post is connected with the positive pole utmost point ear electricity of electric core, the part that positive pole post stretches out from mounting hole 103 is used for being connected with the positive pole of outside consumer, so that the battery can carry out normal charge-discharge operation.

Fig. 2 is a schematic partial cross-sectional view of a top cover 100 according to the present embodiment; fig. 3 is a partially exploded view of a top cover 100 according to the present embodiment; fig. 4 is a schematic partial structure diagram of a top cover 100 according to this embodiment. Referring to fig. 1 to 4, in the present embodiment, the battery to which the composite post 104 is applied is specifically selected to be a lithium ion battery, and when the composite post 104 is applied to a lithium ion battery, the composite post 104 includes an inner post 105 and an outer post 107, where the inner post 105 of the negative post is used to be electrically connected to an anode tab of an electric core, and the material thereof is selected to be a copper material to ensure the usability of the battery, and the outer post 107 of the negative post is used to be connected to a cathode of an external electric device, and the material thereof is selected to be an aluminum material to save the cost. Similarly, the inner electrode post 105 and the negative electrode post of the positive electrode post are both made of aluminum, so as to further save the manufacturing cost. Of course, in other embodiments, the composite post 104 may also be suitable for a sodium ion battery, and when being suitable for a sodium ion battery, the material of the positive post and the negative post of the composite post 104 is aluminum, which is not limited in this embodiment.

In detail, in order to ensure stability and reliability of the composite pole 104, in the present embodiment, the inner pole 105 is provided with the first fitting part 121. The outer pole 107 is provided with a second fitting portion 123 that fits with the first fitting portion 121. Also, one of the first and second fitting parts 121 and 123 is a concave groove, and the other of the first and second fitting parts 121 and 123 is a convex. Meanwhile, when the first matching part 121 is matched with the second matching part 123, the circumferential edge of the protrusion is attached to the circumferential edge of the inner wall of the concave groove, and the end surface of the protrusion is attached to the bottom of the concave groove.

Through setting up like this, on the one hand, this compound utmost point post 104's interior utmost point post 105 and outer utmost point post 107's cooperation need not to adopt the welding mode to connect again, therefore does not have the rosin joint problem, also can reduce the risk that utmost point post drops, avoids the appearance of the fried hole that the welding causes, weld and wear, gas leakage scheduling problem. Meanwhile, the composite pole post 104 of the embodiment only needs to match the concave groove and the protrusion by stamping and the like, and compared with a welding method, stamping has the advantages of simple matching method, reliability and low cost; on the other hand, the circumferential direction of the inner wall of the groove of the concave groove is tightly attached to the circumferential direction of the protrusion in a stamping mode, and the end face of the protrusion is also tightly matched with the groove bottom of the concave groove, so that the rigidity of the composite pole 104 can be guaranteed, the conductivity and the air tightness of the composite pole 104 can be guaranteed, and the quality, the use performance and the safety performance of the composite pole 104 can be effectively guaranteed.

In the present embodiment, the inner pole post 105 and the outer pole post 107 are formed into a composite fitting structure of the first fitting portion 121 and the second fitting portion 123 by means of stamping. Closely cooperate with the mode of the two adoption punching presses, can be at control cost, when raising the efficiency, can also play overcurrent and relatively fixed effect through the structure that the two punching presses formed to can fully guarantee stability performance, security performance and the performance of compound utmost point post 104, and then can guarantee the security and the reliability of battery. Of course, in other embodiments, the first fitting portion 121 and the second fitting portion 123 may be obtained by stamping first, and then the two are fitted by bonding and other manners, so that the concave groove and the protrusion can be tightly fitted to ensure the performance of the composite pole 104, which is not described in detail in this embodiment.

Fig. 5 is a schematic structural diagram of another top cover 100 provided in this embodiment; fig. 6 is a schematic partial cross-sectional view of another top cover 100 provided in this embodiment; fig. 7 is a partially exploded view of another top cover 100 provided in this embodiment; fig. 8 is a partial structural schematic view of another top cover 100 provided in this embodiment. Referring to fig. 1 to 8, in the present embodiment, the number of the first matching portions 121 may be multiple, or may be one, and the number of the second matching portions 123 is matched with the number of the first matching portions 121. For example, as shown in fig. 1 to 4, the number of the first fitting part 121 and the second fitting part 123 is one, and as shown in fig. 5 to 8, the number of the first fitting part 121 and the second fitting part 123 is two, so as to further ensure the stability and reliability of the composite pole post 104, thereby ensuring the safety performance and the service performance of the battery. Of course, in other embodiments, the number of the first matching portions 121 and the second matching portions 123 may also be adjusted according to requirements, for example, three or four matching portions may be provided, and details are not described in this embodiment.

In detail, no matter the number of the first fitting portions 121 and the second fitting portions 123 is several, and no matter whether the composite pole post 104 is a positive pole post or a negative pole post, in the present embodiment, the inner pole post 105 is convexly provided with the pole post boss 115, and the arrangement of the pole post boss 115 facilitates the insertion with the mounting hole 103, so that the outer pole post 107 can be exposed from the mounting hole 103 to be connected with an external electric device. Meanwhile, the first fitting portion 121 is specifically a recessed groove formed in the mesa top wall of the terminal post boss 115, the recessed direction of the recessed groove is opposite to the protruding direction of the terminal post boss 115, the recessed depth of the recessed groove is smaller than or equal to the protruding height of the terminal post boss 115, and the second fitting portion 123 is protruding.

In this embodiment, first cooperation portion 121 is the depressed groove, and second cooperation portion 123 is protruding, through setting up like this, when carrying out the processing operation, can be earlier with interior utmost point post 105 punching press utmost point post boss 115, then with interior utmost point post 105 and the laminating of outer utmost point post 107 to jointly with the two punching press the depressed groove that the laminating set up and bellied composite construction can, simple, convenient and efficient. Meanwhile, in the embodiment, the concave direction of the concave groove is opposite to the convex direction of the post boss 115, so that the stamping direction of the post boss 115 is opposite to the stamping direction of the concave groove and the convex composite structure, the air tightness and the stability of the concave groove and the convex composite structure after stamping can be further ensured, and the stability and the reliability of the composite post 104 can be further ensured. In addition, the sunken depth of the sunken groove is less than or equal to the protruding height of the pole boss 115, so that other spaces are not required to be occupied in the stamping process, the overall structure is more compact and stable, and the stability and reliability of the composite pole 104 can be further ensured.

It should be noted that, in this embodiment, one side of the post boss 115, which is obtained by stamping the inner post 105, close to the electric core is provided with an accommodating groove 119, and the concave groove and the convex composite stamped structure, which are formed by stamping the inner post 105 and the outer post 107 at the same time, are accommodated in the accommodating groove 119, so that the safety of the composite stamped structure can be ensured, and the reliability of the composite stamped structure can be further ensured, thereby fully ensuring the safety and reliability of the battery.

It should be further noted that, in other embodiments, the recessed groove may also be disposed in the outer pole 107, and the protrusion may also be disposed in the inner pole 105, and at this time, the stamping direction of the pole boss 115 of the inner pole 105 is the same as the stamping direction of the composite structure of the recessed groove and the protrusion, which is not described again in this embodiment.

Referring to fig. 2 to 4 and fig. 6 to 8 again, in the present embodiment, the inner pole 105 further includes a first pole body 113, and the pole boss 115 is disposed on the first pole body 113 in a protruding manner. Correspondingly, the outer pole 107 includes a second pole body 117, and when the concave groove and the protrusion are matched, the second pole body 117 is attached to the first pole body 113. That is, when the inner pole post 105 and the outer pole post 107 are punched to form the composite punched structure with the concave groove and the convex, the first pole post body 113 and the second pole post body 117 can be attached to each other, so that the air tightness, the stability and the reliability of the composite pole post 104 can be further ensured, and the safety and the reliability of the battery can be further improved.

Alternatively, in the present embodiment, the concave groove has a notch and a groove bottom opposite to the notch, and the inner diameter of the concave groove first decreases and then increases in the notch-to-groove bottom direction. That is, the shape of depressed groove sets up to be close to the tank bottom the position bigger for after the punching press formed protruding and the compound cooperation structure of depressed groove, the protruding difficult depressed groove of following is deviate from, and outer utmost point post 107 is more difficult to separate with interior utmost point post 105, thereby the structure is compacter, and then can further guarantee the security and the reliability of battery.

Further optionally, in this embodiment, the composite pole post 104 may further be provided with a conductive layer (not shown) according to requirements, where the conductive layer is located between the first matching portion 121 and the second matching portion 123. The conductive layer is a structure made of a softer conductive material, and can be stamped together with the inner pole 105 and the outer pole 107 to obtain a composite structure matched with the first matching portion 121 and the second matching portion 123, so that the contact area between the first matching portion 121 and the second matching portion 123 is increased, the conductivity between the first matching portion 121 and the second matching portion 123 is enhanced, and the safety and the reliability of the battery are further ensured.

Referring to fig. 2 to 4 and fig. 6 to 8 again, in this embodiment, a bus bar 133 is further disposed on one side of the top cover plate 101 close to the battery core, one end of the bus bar 133 is connected to the inner electrode post 105, and the other end of the bus bar 133 is connected to a tab of the battery core to communicate the inside and the outside of the battery. Wherein the bus bar sheet 133 is integrally formed with the first pole body 113 of the inner pole 105. Specifically, the inner pole 105 and the bus bar 133, which are connected and disposed, may be directly stamped using a copper material, so as to simplify the manufacturing process, improve the manufacturing efficiency, and ensure the stability and reliability of the manufactured composite pole 104.

In this embodiment, the bus bar sheet 133 is integrally formed with the internal electrode post 105, so that the original assembly sequence of the battery can be changed. In detail, prior art because utmost point post and the structure that converges separately set up, therefore when utmost point post and the utmost point ear cooperation of electricity core, need earlier with the structure that converges and install to the top cap, earlier with the utmost point post welding cooperation of top cap, then assemble whole top cap to battery case to make the structure that converges again with utmost point ear welding, such mounting means process is complicated, and the required precision is high around installation and the welding to the structure that converges, therefore also be convenient for the operation. Therefore, in the present embodiment, the bus bar 133 and the inner pole 105 are integrally formed, and in the assembling process, the integrally formed structure and the tab are directly welded and then mounted on the top cover, so that the process can be effectively simplified, the cost can be saved, and the assembling and manufacturing efficiency can be improved.

Referring to fig. 2 to 4 and fig. 6 to 8 again, in the present embodiment, the top cover plate 101 specifically includes a cover 109 and a plastic body 111 disposed on one side of the cover 109 close to the battery cell, and the plastic body 111 can provide an insulation protection function to further ensure the safety of the battery. Meanwhile, the mounting hole 103 of the top cover 100 is disposed through the top cover plate 101 and the plastic body 111. And the inner pole 105 is attached to one side of the plastic body 111 close to the battery cell, and the pole boss 115 of the inner pole 105 is inserted into the mounting hole 103. Meanwhile, the bus bar 133 is also attached to one side of the plastic body 111 close to the battery cell, so as to be electrically connected to a tab of the battery cell, thereby ensuring efficient operation of battery charging and discharging.

Alternatively, in the present embodiment, the top cover 100 includes a sealing ring 125 and an insulating stopper 127. The sealing ring 125 is disposed between the internal pole 105 and the inner wall of the mounting hole 103, and is used for sealing and connecting the internal pole 105 and the inner wall of the mounting hole 103; the insulation stopper 127 is disposed between the outer pole 107 and the inner wall of the mounting hole 103, and is used for limiting the position of the outer pole 107 relative to the top cover 100. Through the setting of sealing washer 125 and insulating locating part 127 for the gas tightness between compound utmost point post 104 and the mounting hole 103 is better, and the two complex structures are compacter and reliable, thereby do benefit to the performance and the security performance that guarantee compound utmost point post 104, and then can further improve the reliability and the stability of battery. Meanwhile, the material of the insulating limiting part 127 is specifically selected to be pps, which has the advantages of good rigidity and insulation, so that the insulating limiting part can be matched with the sealing ring 125 to provide good limiting and insulating effects, thereby ensuring the compression amount of the sealing ring 125, providing limiting and insulating effects for the matching between the composite pole post 104 and the top cover 100, further improving the stability and safety of the composite pole post 104, and further improving the stability and safety of the battery.

Of course, in other embodiments, the top cap 100 can also set up the sealing ring 125 to be sleeved outside the whole composite pole 104 according to requirements, so as to simultaneously seal and connect the inner pole 105 and the inner wall of the mounting hole 103, and the outer pole 107 and the inner wall of the mounting hole 103, so that the airtightness between the inner pole 105 and the outer pole 107 and the mounting hole 103 is better, and thus the safety and reliability of the battery can be further ensured, which is not described in detail in this embodiment.

In detail, the first post body 113 is inserted into the mounting hole 103, and the sealing ring 125 is specifically sleeved outside the post boss 115 for sealing engagement with the inner wall of the mounting hole 103. The insulation limiting member 127 is provided with an inner ring groove 129 and an outer ring groove 131, the cover plate further comprises an annular protrusion 135 located on the edge of the inner wall of the mounting hole 103, the outer pole 107 is inserted into the inner ring groove 129, and the annular protrusion 135 is inserted into the outer ring groove 131. On one hand, the sealing ring 125 is sleeved outside the pole boss 115, so that the pole boss 115 is matched with the top cover 100 more tightly and reliably, and the reliability and stability of the integral structure obtained after stamping are ensured; on the other hand, since the insulating limiting member 127 is provided with the inner annular groove 129 and the outer annular groove 131, the inner annular groove 129 can be tightly matched with the second pole body 117, so that the air tightness between the second pole body 117 and the top cover 100 can be ensured, and the outer annular groove 131 can be matched with the annular protrusion 135, so that the air tightness is further improved after the composite pole 104 is matched with the sealing ring 125 and the insulating limiting member 127, and the safety and the reliability of the battery can be fully ensured.

Further optionally, an upper portion (an end far away from the battery core) of the sealing ring 125 may be set to abut against a lower portion (an end close to the battery core) of the insulation limiting member 127, so as to further improve the sealing performance and stability of the whole composite post 104 after being matched with the top cover plate 101, thereby further improving the safety and reliability of the battery.

The following detailed description of the preparation process, the operation principle and the advantageous effects of the battery provided by the embodiment of the present invention:

when the battery is prepared, the composite post 104 may be disposed on the top cover 100; then, the battery cell is mounted in the casing, the top cover plate 101 is fitted to the casing, the positive tab of the battery cell is electrically connected to the internal post 105 of the positive post, and the negative tab of the battery cell is electrically connected to the internal post 105 of the negative post. In the process of arranging the composite pole 104 on the top cover plate 101, the copper plate can be firstly stamped into a composite structure of the first pole body 113 with the pole boss 115 and the bus plate 133 to serve as the inner pole 105 of the negative pole, and meanwhile, the aluminum plate is stamped into a composite structure of the first pole body 113 with the pole boss 115 and the bus plate 133 to serve as the inner pole 105 of the positive pole; then, the two sealing rings 125 are respectively sleeved outside the pole bosses 115 of the two inner poles 105, and the pole bosses 115 penetrate through the corresponding mounting holes 103 and then extend out so as to be attached to the inner walls of the mounting holes 103 at the corresponding positions through the sealing rings 125; then, two external aluminum plates are used as the external pole 107, are respectively attached to the two internal poles 105, and are respectively stamped to form a negative pole and a positive pole with a composite structure of a concave groove and a convex; finally, the two insulation stoppers 127 may be respectively disposed between the two outer poles 107 and the top cover plate 101.

In the process, on one hand, the composite pole post 104 is not required to be connected in a welding mode, so that the problem of insufficient soldering is avoided, and only the concave groove and the protrusion are required to be matched in a stamping mode and the like, so that the composite pole post has the advantages of simple and reliable matching mode and low cost; on the other hand, when punching operation is carried out, the circumference of the inner wall of the concave groove is tightly attached to the circumference of the protrusion, and the end face of the protrusion is also tightly matched with the groove bottom of the concave groove, so that not only can the rigidity of the composite pole 104 be ensured, but also the conductivity and the air tightness of the composite pole 104 can be ensured, and the quality, the use performance and the safety performance of the composite pole 104 can be effectively ensured.

In summary, the embodiment of the present invention provides a composite post 104 with simple and reliable fitting manner and low cost, which can effectively ensure the quality, the usability and the safety performance of the battery. Embodiments of the present invention also provide a top cap 100 and a battery, which includes the composite post 104 described above. Therefore, the method also has the advantages of low cost, good performance and high quality.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.