CN220021347U

CN220021347U - Battery monomer, battery package and consumer

Info

Publication number: CN220021347U
Application number: CN202321184307.2U
Authority: CN
Inventors: 张达; 王国良; 庾桃; 胡浩天; 郭冠南
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2023-05-16
Filing date: 2023-05-16
Publication date: 2023-11-14
Anticipated expiration: 2033-05-16

Abstract

The utility model discloses a battery cell, a battery pack and electric equipment, wherein the battery cell comprises a shell, a pole core and a cover plate, the shell forms a containing cavity with an opening, the pole core is arranged in the containing cavity, the cover plate is arranged at the opening, a convex connecting part is arranged on one side of the cover plate, facing the containing cavity, of the cover plate, a reinforcing part is arranged on the connecting part, and the connecting part and the reinforcing part are electrically connected with a first pole lug of the pole core through a first conductive bonding layer. The battery cell of the embodiment of the utility model can ensure the connection quality while realizing the electric connection between the cover plate and the pole core, thereby improving the reliability of the battery cell, and simultaneously being beneficial to improving the capacity of the pole core and increasing the overcurrent area between the cover plate and the pole core, thereby improving the capacity of the battery cell, reducing the manufacturing cost of the battery cell and improving the use safety and charging performance of the battery cell.

Description

Battery monomer, battery package and consumer

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery monomer, a battery pack and electric equipment.

Background

In order to realize the electric connection between the pole core and the cover plate, the current collecting disc is arranged between the pole core and the cover plate, but the current collecting disc occupies the pole core layout space when the current collecting disc is used because the current collecting disc has a certain height, so that the capacity of the pole core is reduced, that is, the capacity of the battery is reduced, and the manufacturing difficulty and the manufacturing cost of the battery are increased.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides a battery cell, which can ensure the capacity of the pole core while realizing the electric connection between the pole core and the cover plate, reduce the manufacturing cost of the battery cell and ensure the use safety of the battery cell, and solve the technical problems of high manufacturing difficulty, high manufacturing cost, small capacity and the like of the battery cell in the prior art.

A second object of the present utility model is to provide a battery pack having the above battery cells.

A third object of the present utility model is to provide an electric device having the above battery pack.

According to an embodiment of the present utility model, a battery cell includes: a housing forming a receiving cavity having an opening; the pole core is arranged in the accommodating cavity; the cover plate is arranged at the opening, a protruding connecting part is arranged on one side, facing the accommodating cavity, of the cover plate, a reinforcing part is arranged on the connecting part, and the connecting part and the reinforcing part are electrically connected with the first lug of the pole core through a first conductive adhesive layer.

According to the battery cell provided by the embodiment of the utility model, the cover plate and the pole core are connected through the first conductive adhesive layer, so that the cover plate and the pole core are electrically connected, the connection quality is ensured, and meanwhile, the setting of the current collecting disc is omitted, thereby reducing the manufacturing difficulty and the manufacturing cost of the battery cell, and avoiding the current collecting disc occupying the layout space of the pole core, so that the capacity of the pole core, namely the capacity of the battery cell, is improved; meanwhile, the protruding connecting part is arranged on the cover plate, the reinforcing part is arranged on the connecting part, the connecting part is matched with the reinforcing part, the stop matching of the cover plate and the pole core can be realized, the connection strength of the cover plate and the pole core is increased, the reliability of the battery is ensured, the overcurrent area between the cover plate and the pole core can be increased, the defect that the pole core is overcurrent due to small overcurrent area is avoided, and the problem that the pole core is serious in heat production is avoided, so that the service life of the pole core is prolonged, and the use safety and the charging performance of the pole core are improved. That is, the battery cell of the present utility model has the advantages of low manufacturing difficulty, low manufacturing cost, large capacity, good structural reliability, long service life and high use safety.

In some embodiments, the connection portion has a protrusion height in the range of 0.2mm to 1.5mm.

In some embodiments, the reinforcement is formed as a boss located within the first conductive adhesive layer.

In some embodiments, in the thickness direction of the cover plate, the extension height of the boss ranges from 0.2mm to 0.8mm.

In some embodiments, the connecting portion is provided with a plurality of bosses, and a plurality of bosses are arranged at intervals.

In some embodiments, the cover plate forms a circular cover plate, and the plurality of bosses are sequentially arranged at intervals along the circumferential direction and/or the radial direction of the cover plate.

In some embodiments, the boss is one or more of a hemispherical boss, a frustoconical boss, or a conical boss.

In some embodimentsThe overcurrent requirement I of the pole core and the overcurrent capacity of the cover plate meet the following relational expression:wherein mu ₁ The overcurrent coefficient of the boss; n is the number of the bosses; Δs is the mating area of the connection portion and the first conductive adhesive layer increased by the boss; mu (mu) ₂ The overcurrent coefficient of the connecting part; s0 is the actual area of the connection.

In some embodiments, an explosion-proof valve is provided on the cover plate, the explosion-proof valve being configured to open to vent when subjected to a set pressure, the explosion-proof valve being spaced from the connection.

In some embodiments, the plurality of connecting portions is provided, and the plurality of connecting portions and the explosion-proof valve are arranged at intervals along the circumferential direction of the cover plate.

In some embodiments, the cover plate is provided with a plurality of connecting parts, and an exhaust channel is formed between two adjacent connecting parts, and the exhaust channel is communicated with the explosion-proof valve.

In some embodiments, the minimum distance between two adjacent connection portions is in the range of 1mm to 5mm.

In some embodiments, the battery cell further includes a post disposed on the housing, the post being connected to the second tab of the pole core by a second conductive adhesive layer.

In some embodiments, the thickness of the first conductive adhesive layer and the second conductive adhesive layer ranges from 0.05mm to 0.5mm.

In some embodiments, the pole core comprises a first pole piece comprising the first tab and a second pole piece comprising the second tab; the first pole piece and the second pole piece are both made of composite foil materials, and the composite foil materials comprise plastic layers and metal layers arranged on two opposite sides of the plastic layers.

In some embodiments, the battery cell is a cylindrical battery.

The battery pack according to the embodiment of the utility model comprises a plurality of the battery cells.

According to the battery pack disclosed by the embodiment of the utility model, the manufacturing difficulty and the manufacturing cost of the battery pack can be effectively reduced by adopting the battery cells, and meanwhile, the battery pack has the advantages of high safety, excellent charging performance, large capacity, good structural reliability and the like.

The electric equipment comprises the battery pack.

According to the electric equipment provided by the embodiment of the utility model, the battery pack is adopted to realize the adoption of the battery monomer, so that the manufacturing difficulty and the manufacturing cost of the electric equipment are reduced, the reliability of the electric equipment is ensured, and the use safety and the charging performance of the electric equipment are ensured.

Additional aspects and advantages of the utility model will become apparent in the following description or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is an exploded view of a battery cell according to some embodiments of the present utility model.

Fig. 2 is a front view of a battery cell according to some embodiments of the utility model.

Fig. 3 is a cross-sectional view taken along line A-A of fig. 2.

Fig. 4 is a partial enlarged view of the region i in fig. 3.

Fig. 5 is a partial enlarged view of area ii in fig. 3.

Fig. 6 is a schematic view of a cover plate according to some embodiments of the utility model.

Fig. 7 is a top view of a cover plate according to some embodiments of the utility model.

Fig. 8 is a cross-sectional view of a cover plate according to some embodiments of the utility model.

Fig. 9 is an enlarged partial view of the area iii in fig. 8.

Fig. 10 is a cross-sectional view of a cover plate of other embodiments of the present utility model.

Fig. 11 is a partial enlarged view of the region iv in fig. 10.

Fig. 12 is a schematic view of a pole according to some embodiments of the first aspect of the present utility model.

Fig. 13 is a cross-sectional view of the pole in fig. 12.

Fig. 14 is a partial enlarged view of the region v in fig. 13.

Fig. 15 is a cross-sectional view of a post according to some embodiments of the second aspect of the utility model.

Fig. 16 is a partial enlarged view of the region vi in fig. 15.

Fig. 17 is a schematic view of a pole according to some embodiments of the third aspect of the present utility model.

Fig. 18 is a schematic view of another angle of a pole according to some embodiments of the third aspect of the present utility model.

Fig. 19 is a schematic view of an insulator mated with a post according to some embodiments of the present utility model.

FIG. 20 is a schematic view of a composite foil according to some embodiments of the utility model.

Reference numerals:

1000. a battery cell; 100. a housing; 200. a pole core; 210. a first tab; 220. a second lug; 230. a composite foil; 231. a plastic layer; 232. a metal layer; 300. a pole; 310. a boss; 320. a guide channel; 330. a connection region; 350. a first surface; 360. a guide part; 370. a flow guiding part; 371. a diversion area; 410. a second conductive adhesive layer; 420. a first conductive adhesive layer; 500. an insulating member; 510. a mating portion; 511. a stop protrusion; 520. a flow-limiting space; 600. a seal; 700. a cover plate; 710. a connection part; 720. a boss; 730. an explosion-proof valve; 740. an exhaust passage; 750. a reinforcing part; 800. an insulating film; 900. and a liquid injection hole.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

The battery cell 1000 according to the embodiment of the present utility model is described below with reference to the drawings of the specification.

As shown in conjunction with fig. 1, 2 and 3, a battery cell 1000 according to an embodiment of the present utility model includes: the housing 100, the pole piece 200 and the cover plate 700.

Wherein the housing 100 forms a receiving chamber having an opening. Here, the housing 100 has a receiving cavity formed therein, and the receiving cavity has an opening for allowing communication between the inside and the outside of the housing 100 to ensure that an external structural member (e.g., the pole core 200) can be disposed in the receiving cavity.

The pole piece 200 is arranged in the accommodating cavity. It is also understood that the pole core 200 is disposed in the housing 100 (as shown in fig. 3), so as to protect the pole core 200 by using the housing 100, prolong the service life of the pole core 200 and improve the use safety of the pole core 200.

The cover plate 700 is arranged at the opening, a protruding connecting portion 710 is arranged on one side, facing the accommodating cavity, of the cover plate 700, a reinforcing portion 750 is arranged on the connecting portion 710, and the connecting portion 710 and the reinforcing portion 750 are electrically connected with the first tab 210 of the pole core 200 through the first conductive adhesive layer 420. Here, the first tab 210 is disposed on the pole core 200, and the cover plate 700 is disposed at the opening and connected to the first tab 210 through the first conductive adhesive layer 420, so as to electrically connect the pole core 200 and the cover plate 700.

It should be noted that, by arranging the cover plate 700 at the opening, the cover plate 700 can be used to seal the opening, so as to prevent foreign matters, dust and the like from entering the accommodating cavity through the opening, and further improve the use safety of the pole core 200.

Meanwhile, since the connection portion 710 is formed as a protrusion structure, when the cover plate 700 is connected with the pole core 200 through the connection portion 710, the cover plate 700 and the pole core 200 can be in a compressed state, and the connection strength is ensured.

In addition, the cover plate 700 and the pole core 200 are connected by the first conductive adhesive layer 420, so that the cover plate 700 and the pole core 200 are fixedly connected, meanwhile, the intervention of welding equipment and the welding process steps can be omitted, meanwhile, the introduction of foreign matters caused by welding into the shell 100 can be avoided, and the quality of the battery cell 1000 is ensured.

It should be further emphasized that the present application provides the reinforcement portion 750 on the connection portion 710, and also provides the reinforcement portion 750 to be electrically connected to the first tab 210 of the pole core 200 through the first conductive adhesive layer 420. In this way, the connection area between the cover plate 700 and the first conductive adhesive layer 420 can be increased by using the reinforcing portion 750, so as to increase the connection strength, so that the relative position between the cover plate 700 and the first conductive adhesive layer 420 is stable, that is, the connection strength between the cover plate 700 and the pole core 200 is increased, the connection quality is ensured, the structural reliability of the battery cell 1000 is improved, and meanwhile, the overcurrent area between the cover plate 700 and the pole core 200 can be increased, so that the use safety and the charging performance of the pole core 200 are improved.

As can be seen from the above structure, in the battery cell 1000 according to the embodiment of the present utility model, the protruding connection portion 710 is disposed on the cover plate 700, and the connection portion 710 is used to connect with the pole core 200 in a matching manner, so that the cover plate 700 and the pole core 200 can be in a compressed state during the connection process while the cover plate 700 and the pole core 200 are electrically connected, and the connection strength is ensured, thereby ensuring the reliability and the structural stability of the battery cell 1000.

In addition, the cover plate 700 and the pole core 200 are connected by the first conductive adhesive layer 420 to realize the adhesive matching of the cover plate 700 and the pole core 200, so that the cover plate 700 and the pole core 200 are electrically connected, the connection quality is ensured, the setting of a current collecting disc is omitted, the structure of the battery cell 1000 is simplified, the manufacturing difficulty of the battery cell 1000 is reduced, and the manufacturing cost of the battery cell 1000 is saved.

It should be noted that, since the current collecting plate has a certain height, after the current collecting plate is omitted, the layout space of the pole core 200 can be increased adaptively, so as to increase the capacity of the pole core 200, that is, the capacity of the battery cell 1000.

Meanwhile, based on the bonding cooperation of the cover plate 700 and the pole core 200, the utility model sets the reinforcing part 750 on the connecting part 710 of the cover plate 700, and in the process of connecting the cover plate 700 and the pole core 200 through the first conductive bonding layer 420, the reinforcing part 750 is also set to be electrically connected with the first conductive bonding layer 420 so as to increase the connecting area of the cover plate 700 and the first conductive bonding layer 420, thereby increasing the connecting strength of the cover plate 700 and the first conductive bonding layer 420, namely, increasing the connecting strength of the cover plate 700 and the pole core 200, thereby improving the reliability of the battery cell 1000 while ensuring that the cover plate 700 and the pole core 200 can be effectively electrically connected, reducing the contact resistance and increasing the conductivity.

Meanwhile, through the arrangement, the connection area between the cover plate 700 and the first conductive adhesive layer 420 is increased, the overcurrent area between the cover plate 700 and the pole core 200 can be increased, the problem that the pole core 200 is insufficient in overcurrent caused by small overcurrent area is avoided, and the problem that the pole core 200 is serious in heat generation is avoided, so that the service life of the pole core 200 is prolonged, the service safety of the pole core 200 is improved, namely the service life of the battery cell 1000 is prolonged, and the service safety and the charging performance of the battery cell 1000 are improved.

That is, the battery cell 1000 of the present application has a simple structure, high reliability, large capacity, long service life, excellent charging performance, and high safety in use.

It can be appreciated that, compared with the prior art, the present application has the protruding connection part 710 provided on the cap plate 700 and the reinforcing part 750 provided on the connection part 710, so that the reinforcing part 750 is electrically connected to the first conductive adhesive layer 420 when the cap plate 700 and the electrode core 200 are connected through the first conductive adhesive layer 420, thereby simplifying the structure of the battery cell 1000, reducing the manufacturing difficulty of the battery cell 1000, saving the manufacturing cost of the battery cell 1000, and increasing the capacity of the battery cell 1000 while ensuring the reliability of the connection of the cap plate 700 and the electrode core 200 and the overcurrent area between the cap plate 700 and the electrode core 200.

Alternatively, the reinforcement 750, the connection 710, and the cover 700 are formed as one piece. In order to reduce the shaping degree of difficulty of reinforcing part 750 and connecting portion 710, still can reduce the degree of difficulty of being connected of reinforcing part 750 and connecting portion 710 and reduce the degree of difficulty of being connected of connecting portion 710 and apron 700 simultaneously, and guarantee the quality of being connected of reinforcing part 750 and connecting portion 710 and apron 700, make reinforcing part 750 can stably locate connecting portion 710 and connecting portion 710 can stably locate apron 700, thereby be convenient for utilize connecting portion 710 to realize the tight fit of apron 700 and pole piece 200, and be convenient for utilize reinforcing portion 750 to guarantee the reliable connection of apron 700 and pole piece 200.

Optionally, the first conductive adhesive layer 420 is a conductive adhesive, and the conductive adhesive has a certain thickness, and is disposed between the pole core 200 and the cover plate 700, so as to electrically connect the pole core 200 and the cover plate 700.

In a specific example, the battery cell 1000 is a cylindrical battery. So that the battery cell 1000 of the present utility model has the advantages of high capacity, long cycle life, etc.

In some embodiments of the present utility model, the bump height of the connection portion 710 ranges from 0.2mm to 1.5mm. The protruding height of the connection portion 710 refers to a height of the connection portion 710 that is disposed on the cover plate 700 and protrudes toward the pole core 200, and when the protruding height of the connection portion 710 is less than 0.2mm, press-fitting of the cover plate 700 and the pole core 200 cannot be achieved by using the connection portion 710, so that the connection strength of the cover plate 700 and the pole core 200 is reduced; when the protrusion height of the connection portion 710 is greater than 1.5mm, the connection portion 710 may occupy an excessive space, thereby reducing the capacity of the pole piece 200.

Therefore, the present utility model sets the protrusion height range of the connection part 710 to 0.2mm to 1.5mm, and can increase the capacity of the electrode core 200, that is, the capacity of the battery cell 1000, while ensuring the connection strength of the cap plate 700 and the electrode core 200.

In specific examples, the bump height of the connection 710 is 0.2mm, 0.5mm, 0.8mm, 1.0mm, 1.5mm, or the like.

It should be noted that the protrusion height of the connection portion 710 may be understood as h1 shown in fig. 8.

In some embodiments of the present utility model, as shown in connection with fig. 1, 3 and 4, the reinforcement 750 is formed as a boss 720, the boss 720 being located within the first conductive adhesive layer 420. Here, when the reinforcement portion 750 is electrically connected to the pole core 200 through the first conductive adhesive layer 420, the boss 720 formed as the reinforcement portion 750 is located in the first conductive adhesive layer 420, so as to increase the connection area between the reinforcement portion 750 and the pole core 200, and further increase the connection area between the cover plate 700 and the pole core 200, thereby ensuring that the cover plate 700 and the pole core 200 have higher connection strength, and simultaneously increasing the overcurrent area between the cover plate 700 and the pole core 200, and improving the use safety and charging performance of the pole core 200.

Here, the boss 720 means that the reinforcing portion 750 is provided at the connection portion 710 and protrudes toward the pole core 200 to form the boss 720.

As can be seen from the above, the cover 700 and the pole core 200 of the present application are bonded and matched by the first conductive adhesive layer 420 to form an electrical connection, and a part of the structure (the boss 720) on the cover 700 can be located in the first conductive adhesive layer 420 when electrically connected with the pole core 200.

Alternatively, the boss 720 may be disposed on the connection portion 710 by welding, bonding, or other connection methods, and accordingly, the connection portion 710 may be disposed on the cover 700 by welding, bonding, or other connection methods, so as to achieve stable connection between the boss 720 and the connection portion 710 and stable connection between the connection portion 710 and the cover 700.

In a specific example, when the reinforcement 750 is formed as the boss 720, in the process of connecting the core 200 with the cap plate 700, the first conductive adhesive layer 420 may be coated on the connection portion 710 first, so that the boss 720 of the connection portion 710 may be disposed in the first conductive adhesive layer 420, and then, a side surface of the first conductive adhesive layer 420 away from the cap plate 700 is connected with the first tab 210 of the core 200, so as to electrically connect the core 200 with the cap plate 700; or, in the process of connecting the pole core 200 with the cover plate 700, the first conductive adhesive layer 420 is coated on the first tab 210 of the pole core 200, then one side surface of the first conductive adhesive layer 420 away from the pole core 200 is connected with the connecting portion 710, and in the process of connecting the connecting portion 710 with the first conductive adhesive layer 420, the cover plate 700 can be pressed towards the first conductive adhesive layer 420, so that the boss 720 on the connecting portion 710 is arranged in the first conductive adhesive layer 420, and the electrical connection between the pole core 200 and the cover plate 700 is realized.

It should be noted that, the boss 720 may be disposed in the first conductive adhesive layer 420, where all structures of the boss 720 are disposed in the first conductive adhesive layer 420, so as to increase the contact area between the cover plate 700 and the first conductive adhesive layer 420 to the maximum extent, and improve the connection strength; alternatively, part of the structure of the boss 720 is located in the first conductive adhesive layer 420, so as to reduce the thickness of the first conductive adhesive layer 420, or reduce the difficulty in matching the boss 720 with the first conductive adhesive layer 420.

In some examples, during the process of connecting the cover plate 700 and the pole core 200, at least part of the structure of the connecting portion 710 may be disposed in the first conductive adhesive layer 420, so as to further increase the connection area between the cover plate 700 and the first conductive adhesive layer 420, and improve the connection quality.

Of course, in other examples, the reinforcement portion 750 may be formed as a recess portion (not shown in the example drawings) protruding toward a direction away from the pole core 200, and the first conductive adhesive layer 420 is fittingly connected in the recess portion. Here, when the reinforcement portion 750 is electrically connected to the pole core 200 through the first conductive adhesive layer 420, a portion of the first conductive adhesive layer 420 may be filled in the recess portion, so as to increase the connection area between the reinforcement portion 750 and the pole core 200, and further increase the connection area between the cover plate 700 and the pole core 200, so that the cover plate 700 and the pole core 200 can be ensured to have higher connection strength, and meanwhile, the overcurrent area between the cover plate 700 and the pole core 200 can be increased, thereby improving the use safety and charging performance of the pole core 200.

The concave portion referred to herein means that the reinforcing portion 750 is provided at the connection portion 710 and protrudes in a direction away from the pole core 200 to form the concave portion.

In a specific example, when the reinforcement 750 is formed as a recess, in the process of connecting the core 200 with the cap plate 700, the first conductive adhesive layer 420 may be coated in the connection 710 and the recess of the cap plate 700, so that the first conductive adhesive layer 420 may be connected in the recess in a matching manner, and then, a side surface of the first conductive adhesive layer 420 away from the cap plate 700 may be connected with the core 200, so as to electrically connect the core 200 with the cap plate 700; or, in the process of connecting the pole core 200 and the cover plate 700, the first conductive adhesive layer 420 is coated on the pole core 200 first, then one side surface of the first conductive adhesive layer 420 away from the pole core 200 is connected with the cover plate 700, and in the process of connecting the cover plate 700 and the first conductive adhesive layer 420, the cover plate 700 can be pressed towards the first conductive adhesive layer 420 so as to promote the first conductive adhesive layer 420 to be filled in the concave part, and then part of the first conductive adhesive layer 420 is connected in the concave part in a matching way, so that the electric connection between the pole core 200 and the cover plate 700 is realized.

It should be noted that, the first conductive adhesive layer 420 is cooperatively connected in the recess, where the first conductive adhesive layer 420 is filled in the whole recess, so as to maximally increase the contact area between the cover plate 700 and the first conductive adhesive layer 420, and improve the connection strength; alternatively, the first conductive adhesive layer 420 fills a portion of the recess, so as to reduce difficulty in matching the recess with the first conductive adhesive layer 420, and reduce use cost of the first conductive adhesive layer 420.

In other examples, the reinforcement 750 is formed as a boss 720 and a recess. That is, the connection portion 710 is provided with the boss 720 and the recess portion, and the boss 720 and the recess portion are matched to be connected with the first conductive adhesive layer 420, so that the connection area between the cover plate 700 and the pole core 200 can be increased.

In some embodiments of the present utility model, the extension height of the boss 720 in the thickness direction of the cover plate 700 ranges from 0.2mm to 0.8mm. When the extension height of the boss 720 is less than 0.2mm, the connection area between the cover plate 700 and the first conductive adhesive layer 420 cannot be effectively increased; when the extension height of the boss 720 is greater than 0.8mm, on one hand, the manufacturing difficulty of the boss 720 is increased, and on the other hand, when the boss 720 needs to be fully disposed in the first conductive adhesive layer 420, the thickness of the first conductive adhesive layer 420 is also increased, so as to increase the use cost of the first conductive adhesive layer 420 and reduce the capacity of the pole core 200.

Therefore, the extension height of the boss 720 is set to be 0.2 mm-0.8 mm, so that the connection area of the cover plate 700 and the first conductive adhesive layer 420 is ensured, the molding difficulty of the boss 720 is reduced, the use cost of the first conductive adhesive layer 420 is reduced, and the capacity of the electrode core 200, that is, the capacity of the battery cell 1000 is ensured.

In particular examples, the extension height of boss 720 is 0.2mm, 0.4mm, 0.6mm, 0.8mm, or the like.

It should be noted that the extension height of the boss 720 is understood to be h2 shown in fig. 9 and 11.

Alternatively, as shown in fig. 9 and 11, the inclination angle of the line connecting the highest point and the lowest point of the boss 720 with respect to the plane of the cover plate 700 is a1, wherein the value of a1 ranges from 10 ° to 70 °. While ensuring that the boss 720 can be effectively disposed in the first conductive adhesive layer 420, the contact area between the boss 720 and the first conductive adhesive layer 420, that is, the contact area between the cover plate 700 and the first conductive adhesive layer 420, can be increased, so that the relative position between the cover plate 700 and the first conductive adhesive layer 420 is stable.

In some embodiments of the present utility model, as shown in fig. 1, 6 and 7, a plurality of bosses 720 are provided on the connection portion 710, and the plurality of bosses 720 are spaced apart. The plurality of bosses 720 are matched to increase the connection area of the cover plate 700 and the first conductive adhesive layer 420, and ensure the connection strength, so that the cover plate 700 and the first conductive adhesive layer 420 are reliably connected, that is, the cover plate 700 and the pole core 200 are reliably connected, and the reliability of the battery cell 1000 is improved.

It should be noted that, the present application does not limit the specific number of the bosses 720, and when the volume of the bosses 720 is larger, the number of the bosses 720 can be reduced correspondingly; when the size of the boss 720 is smaller, the number of the bosses 720 can be correspondingly increased, so that the connection strength between the cover plate 700 and the first conductive adhesive layer 420 can be effectively increased by using the boss 720.

Alternatively, as shown in fig. 7, the cover plate 700 forms a circular cover plate, and the plurality of bosses 720 are sequentially spaced apart in the circumferential direction and/or the radial direction of the cover plate 700. Here, when the cover plate 700 forms a circular cover plate, the plurality of bosses 720 are sequentially arranged at intervals in the circumferential direction of the cover plate 700; or, the plurality of bosses 720 are sequentially spaced apart in the radial direction of the cover plate 700; or, the plurality of bosses 720 are sequentially arranged at intervals along the circumferential direction and the radial direction of the cover plate 700, so that the plurality of bosses 720 are arranged on the cover plate 700, and the connection reliability of the cover plate 700 and the first conductive adhesive layer 420 is conveniently increased by utilizing the cooperation of the plurality of bosses 720.

Meanwhile, the positions of the bosses 720 on the cover plate 700 can be reasonably set through the arrangement, so that a plurality of bosses 720 can be uniformly arranged on the cover plate 700, and a plurality of positions of the cover plate 700 can be reliably connected with the first conductive adhesive layer 420.

In some embodiments of the utility model, boss 720 is one or more of a hemispherical boss, a frustoconical boss, or a conical boss. Here, the shape of the plurality of bosses 720 may be a single shape, such as: the plurality of bosses 720 are each formed as a hemispherical boss, a truncated cone-shaped boss or a tapered boss; the shape of the plurality of bosses 720 may also be formed into a plurality of shapes, respectively, such as: the plurality of bosses 720 are formed as hemispherical bosses and truncated cone-shaped bosses, respectively; or, the plurality of bosses 720 are formed as hemispherical bosses and conical bosses, respectively; or, the plurality of bosses 720 are respectively formed as a truncated cone-shaped boss and a cone-shaped boss; still alternatively, the plurality of bosses 720 are formed as hemispherical bosses, truncated cone-shaped bosses, and tapered bosses, respectively.

The shape of the boss 720 is not particularly limited, so long as the boss 720 is conveniently disposed in the first conductive adhesive layer 420.

In some examples, as shown in fig. 6, 8 and 9, the plurality of bosses 720 are formed as hemispherical bosses spaced apart from the cover plate 700, and are disposed in the first conductive adhesive layer 420 during the connection of the cover plate 700 to the first conductive adhesive layer 420 to increase the connection area of the cover plate 700 to the first conductive adhesive layer 420.

In other examples, as shown in fig. 10 and 11, the plurality of bosses 720 are formed as circular truncated cone-shaped bosses spaced apart from the cover plate 700, and the plurality of circular truncated cone-shaped bosses may be disposed in the first conductive adhesive layer 420 during the connection of the cover plate 700 with the first conductive adhesive layer 420 to increase the connection area of the cover plate 700 with the first conductive adhesive layer 420.

That is, the boss 720 may be formed as a boss having a larger volume, or may be formed as a boss having a smaller volume.

In some examples, the plurality of bosses 720 are each formed as a large boss that is spaced apart.

In other examples, the plurality of bosses 720 are each formed as small bosses that are spaced apart.

In other examples, the plurality of bosses 720 includes large bosses and small bosses, the large bosses and the small bosses being spaced apart; alternatively, plurality of bosses 720 includes bosses of at least two different sizes.

That is, the plurality of bosses 720 on the cover plate 700 may or may not have the same size, and when the plurality of bosses 720 on the cover plate 700 have the same size, the plurality of bosses 720 are formed as bosses 720 having a larger size; or, the plurality of bosses 720 are formed as bosses 720 having a smaller volume; when the plurality of bosses 720 on the cover plate 700 are not uniform in size, part of the bosses 720 among the plurality of bosses 720 may be formed as small bosses and the other part of the bosses 720 may be formed as large bosses.

Optionally, the overcurrent requirement I of the pole core 200 and the overcurrent capability of the cover plate 700 satisfy the following relation:

wherein mu ₁ Is the overcurrent coefficient of boss 720; n is the number of bosses 720; Δs is the mating area of the connection portion 710 and the first conductive adhesive layer 420 increased by the boss 720; mu (mu) ₂ An overcurrent coefficient of the connection portion 710; s0 is the actual area of the connection 710.

Through the arrangement, the overcurrent capability of the cover plate 700 can be effectively ensured to meet the overcurrent requirement of the pole core 200, so that the phenomenon that the pole core 200 is insufficient in overcurrent is avoided, the problem that the pole core 200 generates serious heat is avoided, the service life of the pole core 200 is prolonged, and the use safety of the pole core 200 is improved.

Mu, in the form of a powder ₁ Can be directly determined according to the material of the boss 720 and is expressed in units of A/mm ² The method comprises the steps of carrying out a first treatment on the surface of the Correspondingly, mu ₂ Or can be determined directly from the material of the connection portion 710 and has a unit of A/mm ² 。

Wherein, when the material of the boss 720 is identical to that of the connection part 710, μ ₁ ＝μ ₂ 。

In a specific example, μ ₁ ＝μ ₂ ＝3A/mm ² ～12A/mm ² 。

It should be further noted that, the over-current requirement I of the pole core 200 may be determined according to the required charging time of the pole core 200, and specifically, the determination manner is that, in the actual production process of the battery cell 1000, the fast charging time that the battery cell 1000 to be produced needs to meet may be directly determined, that is, the charging time of the battery cell 1000 may be clearly known, the charging time of the pole core 200 may be determined according to the charging time of the battery cell 1000, then the over-current requirement I of the pole core 200 may be obtained according to the charging time of the pole core 200, the actual area S0 of the connection portion 710 may be obtained according to the size of the battery cell 1000, after the over-current requirement I of the pole core 200 and the actual area S0 of the connection portion 710 are obtained, the number of the bosses 720 and the matching area of the connection portion 710 and the first conductive adhesive layer 420 that the bosses 720 may increase may be further reasonably set according to the above formula, so as to ensure that after the cover plate 700 passes through the first conductive adhesive layer 420 and the pole core 200, the over-current capability of the cover plate 700 and the over-current requirement I of the pole core 200 may meet certain conditions, thereby avoiding causing the over-current deficiency of the pole core 200, and the severe over-current requirement of the pole core 200, and prolonging the service life of the pole core 200, and realizing the safety 200.

In specific examples, the minimum overcurrent requirement of the pole piece 200 is i=75a-150A; actual area s0=15 mm of cover plate 700 ² ～30mm ² 。

Alternatively, Δs=s1-S2. Where S1 is the surface area of the boss 720, and S2 is the area of the connection portion 710 covered by the boss 720.

That is, after the boss 720 is disposed on the connection portion 710, the mating area of the connection portion 710 increased by the boss 720 and the first conductive adhesive layer 420 is the difference between the actual surface area of the boss 720 and the area of the connection portion 710 covered by the boss 720 (the surface area of the connection portion 710 covered by the boss 720 is defined as S2).

In specific examples, Δs=0.1 mm ² ～5mm ² 。

In some embodiments of the present utility model, as shown in fig. 6 and 7, an explosion-proof valve 730 is provided on the cover plate 700, and the explosion-proof valve 730 is configured to be opened to exhaust air when a set pressure is received, and the explosion-proof valve 730 and the connection part 710 are spaced apart. The explosion-proof valve 730 is provided to ensure that when the internal gas pressure of the battery cell 1000 is high, the gas can be smoothly discharged, so as to achieve the purpose of pressure relief and improve the safety of the battery cell 1000; through setting up explosion-proof valve 730 and connecting portion 710 interval to ensure to set up explosion-proof valve 730 and connecting portion 710 simultaneously on the apron 700, and avoid when utilizing first conductive adhesive layer 420 to connect connecting portion 710, utmost point core 200, first conductive adhesive layer 420 shutoff explosion-proof valve 730, thereby make explosion-proof valve 730 can open smoothly in order to exhaust when receiving the settlement pressure, thereby promote the security of battery cell 1000.

In a specific example, the opening pressure of the explosion proof valve 730 ranges from 0.5MPa to 2.0MPa.

Optionally, the cover plate 700 is provided with explosion-proof holes, the explosion-proof holes are arranged at intervals with the connecting part 710, the explosion-proof valve 730 is arranged at the explosion-proof holes and seals the explosion-proof holes, so that when the explosion-proof valve 730 and the connecting part 710 are arranged at intervals, the gas can be smoothly discharged through the explosion-proof holes to achieve the aim of pressure relief when the internal gas pressure of the battery cell 1000 is high.

Alternatively, as shown in fig. 6 and 7, the connection part 710 is plural, and the plural connection parts 710 and the explosion-proof valve 730 are disposed at intervals along the circumferential direction of the cap plate 700. The multiple connection portions 710 can effectively realize press fit between the cover plate 700 and the pole core 200, and a larger number of bosses 720 can be disposed on the cover plate 700, so as to maximally ensure connection quality between the cover plate 700 and the pole core 200.

Meanwhile, the plurality of connecting portions 710 and the explosion-proof valves 730 are arranged at intervals along the circumferential direction of the cover plate 700, so that the space on the cover plate 700 is reasonably utilized, the explosion-proof valves 730 and the plurality of connecting portions 710 can be arranged on the cover plate 700 at the same time, the explosion-proof valves 730 and the connecting portions 710 can be arranged at intervals, and the explosion-proof valves 730 are prevented from being blocked by the first conductive adhesive layer 420.

Alternatively, as shown in fig. 6 and 7, a plurality of connection parts 710 are provided on the cover plate 700, and an exhaust passage 740 is formed between adjacent two connection parts 710, and the exhaust passage 740 communicates with the explosion-proof valve 730. Thus, the exhaust channel 740 can guide the gas to flow to the explosion-proof valve 730, so as to ensure that the gas in the housing 100 can be smoothly discharged when the explosion-proof valve 730 is opened, thereby achieving the purpose of pressure relief.

Meanwhile, the exhaust channel 740 is arranged between two adjacent connecting parts 710, and the connecting parts 710 are formed into a convex structure, so that the exhaust channel 740 can be formed after the connecting parts 710 are formed, that is, the exhaust channel 740 can be formed in the forming process of the cover plate 700 without independently arranging the exhaust channel 740 on the cover plate 700, so that the forming difficulty of the exhaust channel 740 is reduced, the structural stability of the exhaust channel 740 is ensured, and the exhaust channel 740 can effectively guide the gas flow.

Alternatively, the minimum distance between adjacent two connection portions 710 may be in the range of 1mm to 5mm. It can be understood that a plurality of different distances may be provided between two adjacent connection portions 710, wherein the minimum distance is in the range of 1mm to 5mm, so as to ensure the area of the exhaust channel 740, so that the exhaust channel 740 can effectively guide the gas flow and promote the exhaust speed, thereby ensuring the use safety of the battery cell 1000, and meanwhile, the exhaust channel 740 can be prevented from occupying a larger area, so that the connection portion 710 with a certain area can be provided on the cover plate 700, and the connection strength between the cover plate 700 and the pole core 200 is ensured.

Here, the minimum distance between two adjacent connection parts 710 may be understood as h3 shown in fig. 7.

Optionally, as shown in fig. 6 and 7, the cover plate 700 is provided with a liquid injection hole 900. The liquid injection holes 900 are used for realizing the communication of the two opposite sides of the cover plate 700, so that external electrolyte can be injected into the pole core 200 through the cover plate 700 smoothly, the purpose of injecting the liquid into the pole core 200 is achieved, and the working performance of the pole core 200 is ensured.

In some examples, as shown in fig. 6 and 7, the liquid injection hole 900 extends in the axial direction of the cover plate 700 and penetrates the cover plate 700, and the liquid injection hole 900 is provided in the radial middle of the cover plate 700. So that the electrolyte injection hole 900 can be used for effectively injecting external electrolyte into the pole core 200 smoothly, and meanwhile, the electrolyte injection hole 900 can be arranged right opposite to the radial middle part of the pole core 200, thereby ensuring that the electrolyte injected through the electrolyte injection hole 900 can quickly permeate the pole core 200 and ensuring the electrolyte injection effect.

Optionally, the electrolyte injection hole 900 is communicated with the exhaust channel 740, at this time, the exhaust channel 740 may also be formed into a diversion channel, and the exhaust channel 740 is used for guiding the flow of the electrolyte, so as to ensure that the electrolyte can fully permeate into the pole core 200, thereby achieving the purpose of accelerating the permeation of the electrolyte, improving the electrolyte injection effect, and ensuring the performance of the pole core 200.

As can be seen from the above, the cover plate 700 of the present utility model is provided with the exhaust channel 740 and the injection hole 900, during the actual injection process, the electrolyte can be injected toward the pole core 200 through the injection hole 900, and during the injection process, the exhaust channel 740 can be used to provide guidance for the flow of the electrolyte, so that the electrolyte can be dispersed to different positions of the pole core 200, thereby improving the infiltration effect of the electrolyte on the pole core 200 and ensuring the working performance of the pole core 200.

In some embodiments of the present utility model, as shown in fig. 1, 3 and 5, the battery cell 1000 further includes a post 300, where the post 300 is disposed on the housing 100, and the post 300 is connected to the second tab 220 of the pole core 200 through the second conductive adhesive layer 410. That is, the electrode core 200 has a first tab 210 and a second tab 220, the first tab 210 and the cover plate 700 are electrically connected through the first conductive adhesive layer 420, the second tab 220 and the electrode post 300 are electrically connected through the second conductive adhesive layer 410, and the electrode core 200 is electrically connected with the electrode post 300 and the cover plate 700 respectively, so that the current of the electrode core 200 is led out, and the working performance of the battery cell 1000 is ensured.

The pole 300 is disposed on the housing 100, so that the pole 300 is supported by the housing 100, and the position stability of the pole 300 is improved, so that the structural stability of the battery cell 1000 can be ensured while the pole 300 can be stably connected with the pole core 200, and the position stability after the pole core 200 is connected with the pole 300 can be ensured.

In a specific example, the first tab 210 is formed as a negative tab of the tab 200 and the second tab 220 is formed as a positive tab of the tab 200.

Of course, in other examples, the first tab 210 may also be formed as the positive tab of the electrode core 200, and the second tab 220 may be formed as the negative tab of the electrode core 200, which is not particularly limited in the present application.

It should be noted that, by connecting the pole 300 and the pole core 200 by using the second conductive adhesive layer 410, the intervention of a welding device and the welding process step can be omitted while the fixed connection between the pole 300 and the pole core 200 is realized, and meanwhile, the foreign matters caused by welding can be avoided from being introduced into the housing 100, so as to ensure the quality of the battery cell 1000.

Meanwhile, the pole 300 is directly connected with the second lug 220 of the pole core 200 through the second conductive bonding layer 410, so that the setting of a current collecting disc can be omitted, the structure of the battery cell 1000 is simplified, and the manufacturing difficulty of the battery cell 1000 is reduced, and meanwhile, the manufacturing cost of the battery cell 1000 can be saved.

That is, according to the battery cell 1000 of the present application, the post 300 and the core 200 are bonded and matched, so that the battery cell 1000 has the advantages of simple structure, high reliability, large capacity, and the like.

In a specific example, when the battery cell 1000 is assembled, the electrode core 200 is assembled in the housing 100 through the opening, the second tab 220 of the electrode core 200 is fixedly connected with the electrode post 300 through the second conductive adhesive layer 410, then the cover plate 700 is fixedly connected at the opening, and the first tab 210 of the electrode core 200 is fixedly connected with the cover plate 700 through the first conductive adhesive layer 420, so that the electrode core 200 is respectively electrically connected with the electrode post 300 and the cover plate 700.

Alternatively, as shown in fig. 3, 5 and 12, the side of the pole 300 facing the second tab 220 is provided with a protrusion 310, and the protrusion 310 is located in the second conductive adhesive layer 410. Here, in the process of connecting the pole core 200 and the pole post 300, the protrusion 310 on the pole post 300 may be located in the second conductive adhesive layer 410, so as to increase the connection area between the pole post 300 and the second conductive adhesive layer 410, increase the connection strength, that is, increase the connection strength between the pole post 300 and the pole core 200, and ensure the connection quality, so that the reliability of the battery cell 1000 may be improved while the electrical connection between the pole post 300 and the pole core 200 is effectively ensured, the contact resistance may be reduced, the conductivity may be increased, the overcurrent area between the pole core 200 and the pole post 300 may be increased, and the use safety and charging performance of the pole core 200 may be improved.

The protrusion 310 refers to a structure protruding toward the pole core 200 on the pole 300, so as to form the protrusion 310.

That is, the tab 300 of the present application is not only adhesively engaged with the pole core 200 through the second conductive adhesive layer 410, but also a part of the structure (the protrusion 310) of the tab 300 is located within the second conductive adhesive layer 410 when connected with the pole core 200.

Optionally, the second conductive adhesive layer 410 is a conductive adhesive, and the conductive adhesive has a certain thickness and is disposed between the pole core 200 and the pole post 300 to electrically connect the pole core 200 and the pole post 300.

In a specific example, in the process of connecting the pole core 200 with the pole 300, the second conductive adhesive layer 410 may be coated on the pole 300 first, at this time, the protrusion 310 of the pole 300 may be disposed in the second conductive adhesive layer 410, and then, a side surface of the second conductive adhesive layer 410 away from the pole 300 is connected with the second tab 220 of the pole core 200, so as to achieve electrical connection between the pole core 200 and the pole 300; or, in the process of connecting the pole core 200 and the pole post 300, the second conductive adhesive layer 410 is coated on the second lug 220 of the pole core 200, then one side surface of the second conductive adhesive layer 410 away from the pole core 200 is connected with the pole post 300, and in the process of connecting the pole post 300 and the second conductive adhesive layer 410, the pole post 300 can be pressed towards the second conductive adhesive layer 410, so that the protruding part 310 of the pole post 300 is arranged in the second conductive adhesive layer 410, and the electrical connection between the pole core 200 and the pole post 300 is realized.

It should be noted that, the above-mentioned protruding portion 310 may be located in the second conductive adhesive layer 410, and all structures of the protruding portion 310 are located in the second conductive adhesive layer 410, so as to increase the contact area between the pole 300 and the second conductive adhesive layer 410 to the maximum extent, and improve the connection strength; alternatively, part of the structure of the protruding portion 310 may be located in the second conductive adhesive layer 410, so as to reduce the thickness of the second conductive adhesive layer 410, or reduce the difficulty in matching the protruding portion 310 with the second conductive adhesive layer 410.

The above-mentioned protruding portion 310 may also be understood as a boss.

In some embodiments of the present utility model, the pole 300 has a first surface 350 facing the pole core 200, the first surface 350 being formed as a curved surface, and the boss 310 being located at the curved surface (not shown in this example). Here, the surface of the pole 300 facing the pole core 200 is a first surface 350, the first surface 350 is formed into a curved surface, and the protruding portion 310 is disposed on the curved surface, so as to ensure that the protruding portion 310 can be matched in the second conductive adhesive layer 410 during the connection process of the pole core 200 and the pole core 300, thereby increasing the contact area between the pole core 300 and the pole core 200 and ensuring the connection strength.

It should be noted that, by forming the first surface 350 of the pole 300 into a curved surface, the surface area of the first surface 350 may be increased, and the first surface 350 may be ensured to be disposed in the second conductive adhesive layer 410 during the connection process between the pole core 200 and the pole core 300, so as to further increase the contact area between the pole core 300 and the pole core 200, and ensure the connection strength between the pole core 300 and the pole core 200, thereby improving the reliability of the battery cell 1000.

Optionally, the sum of the heights of the first surface 350 and the protruding portion 310 of the pole 300 in the height direction of the battery cell 1000 is equal to or less than the thickness of the second conductive adhesive layer 410, so as to ensure that the first surface 350 and the protruding portion 310 of the pole 300 can be disposed in the second conductive adhesive layer 410 when the pole core 200 and the pole 300 are connected by using the second conductive adhesive layer 410, thereby maximizing the contact area between the pole core 200 and the pole 300.

Of course, in other examples, the sum of the heights of the first surface 350 of the pole 300 and the protrusion 310 in the height direction of the battery cell 1000 may be greater than the thickness of the second conductive adhesive layer 410, so that when the second conductive adhesive layer 410 is used to connect the pole core 200 and the pole 300, the partial structure of the first surface 350 of the pole 300 and the protrusion 310 are disposed in the second conductive adhesive layer 410, and thus the contact area between the pole 300 and the pole core 200 may be ensured.

Alternatively, the curved surface is formed as an arc surface protruding toward the pole piece 200. It will be understood that, when the surface of the pole 300 facing the pole core 200 protrudes toward the pole core 200 to form an arc surface, the arc surface is defined as a curved surface, and compared to the first surface 350 formed as a flat surface, the curved surface can effectively increase the surface area of the first surface 350 and ensure that the first surface 350 can be disposed in the second conductive adhesive layer 410 during the connection of the pole core 200 and the pole core 300, so as to increase the reliability of the connection of the pole core 200 and the pole core 300.

In a specific example, one end of the pole 300 facing the pole core 200 is formed in a hemispherical shape such that the first surface 350 of the pole 300 facing the pole core 200 is formed in a curved surface.

In some other examples, as shown in connection with fig. 12 and 13, the pole 300 has a first surface 350 facing the pole core 200, the first surface 350 being formed as a circular face. That is, the first surface 350 of the pole 300 is not limited to be an arc surface, but the first surface 350 of the pole 300 may be a circular surface, and the circular surface may form a plane on the first surface 350 of the pole 300, so that the manufacturing difficulty of the pole 300 is reduced and the manufacturing efficiency is improved compared to an arc surface.

It should be noted that, when the first surface 350 of the pole 300 is a circular surface, the circular surface may abut against the second conductive adhesive layer 410 during the connection process of the pole 300 and the pole core 200, so as to utilize the second conductive adhesive layer 410 to realize the electrical connection of the pole 300 and the pole core 200, and ensure the connection strength of the pole 300 and the second conductive adhesive layer 410.

In a specific example, the end face of the pole 300 facing the pole core 200 and the end face of the pole core 200 are parallel to each other such that the first surface 350 of the pole 300 is formed as a circular face.

In some embodiments of the present utility model, as shown in fig. 12, a plurality of protrusions 310 are provided on the pole 300, and the plurality of protrusions 310 are spaced apart from the pole 300. The plurality of protruding portions 310 are matched to increase the connection area of the pole 300 and the second conductive adhesive layer 410, and ensure the connection strength, thereby realizing reliable connection of the pole 300 and the second conductive adhesive layer 410, that is, reliable connection of the pole 300 and the pole core 200, and facilitating improvement of the reliability of the battery cell 1000.

Optionally, a plurality of bosses 310 are integrally formed with the pole 300. It may be understood that the plurality of protruding portions 310 are integrally formed on the pole 300, so as to reduce the forming difficulty of the plurality of protruding portions 310, and meanwhile, reduce the connecting difficulty between the plurality of protruding portions 310 and the pole 300, ensure the connecting quality, and enable the plurality of protruding portions 310 to be stably arranged on the pole 300, so that reliable connection between the pole 300 and the pole core 200 is ensured by using the protruding portions 310.

Of course, in other examples, the plurality of protruding portions 310 may be provided on the pole 300 by welding, bonding, or the like, so as to achieve stable connection between the protruding portions 310 and the pole 300.

Alternatively, as shown in fig. 12, the plurality of protrusions 310 are provided on the first surface 350 and are sequentially spaced apart in a circumferential direction and/or a radial direction of the first surface 350. Here, when the first surface 350 of the pole 300 is formed in a circular surface, the plurality of protrusions 310 are sequentially arranged at intervals in the circumferential direction of the first surface 350; alternatively, the plurality of protrusions 310 are sequentially spaced apart along the radial direction of the first surface 350; still alternatively, the plurality of protruding portions 310 are sequentially arranged at intervals along the circumferential direction and the radial direction of the first surface 350, so as to provide the plurality of protruding portions 310 on the pole 300, so that the connection reliability between the pole 300 and the second conductive adhesive layer 410 is increased by using the cooperation of the plurality of protruding portions 310.

Meanwhile, the positions of the protruding portions 310 on the pole 300 can be reasonably set through the above arrangement, so that the plurality of protruding portions 310 can be uniformly arranged on the pole 300, and therefore a plurality of positions of the pole 300 can be reliably connected with the second conductive adhesive layer 410.

In a specific example, as shown in fig. 12, the first surface 350 of the pole 300 is formed as a circular surface, and a plurality of protrusions 310 are sequentially spaced apart in the circumferential direction and the radial direction of the first surface 350 of the pole 300 at the same time to realize two circles of the protrusions 310 arranged side by side on the first surface 350 of the pole 300.

Optionally, the plurality of bosses 310 are one or more of hemispherical bosses, frustoconical bosses, or conical bosses. Here, the shape of the plurality of protrusions 310 may be a single shape, such as: the plurality of protrusions 310 are each formed as a hemispherical boss, a truncated cone-shaped boss, or a tapered boss; the shape of the plurality of protrusions 310 may also be formed into a plurality of shapes, respectively, such as: the plurality of bosses 310 are formed as hemispherical bosses and truncated cone-shaped bosses, respectively; or, the plurality of bosses 310 are formed as hemispherical bosses and tapered bosses, respectively; alternatively, the plurality of protrusions 310 are formed as a circular truncated cone-shaped boss and a tapered boss, respectively; still alternatively, the plurality of protrusions 310 are formed as hemispherical bosses, truncated cone-shaped bosses, and tapered bosses, respectively.

The shape of the protruding portion 310 is not particularly limited, so long as the protruding portion 310 is conveniently disposed in the second conductive adhesive layer 410.

In some examples, as shown in fig. 12, 13 and 14, the plurality of protruding portions 310 are formed as hemispherical bosses, and the hemispherical bosses are spaced apart from each other on the post 300, and in the process of connecting the post 300 with the second conductive adhesive layer 410, the hemispherical bosses are disposed in the second conductive adhesive layer 410, which can also increase the connection area between the post 300 and the second conductive adhesive layer 410.

In other examples, as shown in fig. 15 and 16, the plurality of protrusions 310 are formed as circular truncated cone shaped bosses, which are spaced apart from each other on the post 300, and may be disposed in the second conductive adhesive layer 410 during the connection of the post 300 with the second conductive adhesive layer 410 to increase the connection area of the post 300 with the second conductive adhesive layer 410.

Optionally, each protrusion 310 has an extension height in the direction toward the pole core 200 ranging from 0.2mm to 0.8mm. When the extension height of the protruding portion 310 in the direction toward the pole core 200 is less than 0.2mm, the connection area between the pole 300 and the second conductive adhesive layer 410 cannot be effectively increased; when the extension height of the protrusion 310 in the direction toward the pole core 200 is greater than 0.8mm, on the one hand, the manufacturing difficulty of the protrusion 310 is increased, and on the other hand, when the protrusion 310 needs to be disposed entirely within the second conductive adhesive layer 410, the thickness of the second conductive adhesive layer 410 is increased, so that the use cost of the second conductive adhesive layer 410 is increased, and the capacity of the pole core 200 is reduced.

Therefore, the present application sets the range of the extension height of the protrusion 310 in the direction of the electrode core 200 to 0.2mm to 0.8mm, and can reduce the molding difficulty of the protrusion 310, reduce the use cost of the second conductive adhesive layer 410, and ensure the capacity of the electrode core 200, that is, the capacity of the battery cell 1000 while ensuring the connection area between the electrode post 300 and the second conductive adhesive layer 410.

In specific examples, the protrusion 310 extends a height of 0.2mm, 0.4mm, 0.6mm, 0.8mm, or the like in a direction toward the pole core 200.

It should be noted that, the extending height of the protrusion 310 in the direction toward the pole core 200 may be understood as H shown in fig. 14 and 16.

Alternatively, as shown in fig. 14 and 16, the inclination angle of the line connecting the highest point and the lowest point of the protrusion 310 with respect to the plane of the pole 300 is a2, wherein the value of a2 ranges from 10 ° to 70 °. While ensuring that the protruding portion 310 can be effectively disposed in the second conductive adhesive layer 410, the contact area between the protruding portion 310 and the second conductive adhesive layer 410, that is, the contact area between the pole 300 and the second conductive adhesive layer 410, can be increased, so that the relative position between the pole 300 and the second conductive adhesive layer 410 is stable.

It should be further noted that, the present application does not limit the specific number of the protruding portions 310, and when the volume of the protruding portions 310 is larger, the number of the protruding portions 310 can be reduced correspondingly; when the volume of the protruding portion 310 is smaller, the number of protruding portions 310 may be increased correspondingly, so as to ensure that the connection strength between the pole 300 and the second conductive adhesive layer 410 can be effectively increased by using the protruding portion 310.

That is, the boss 310 may be formed as a boss having a larger volume, or may be formed as a boss having a smaller volume.

In some examples, the plurality of bosses 310 are each formed as a large boss that is spaced apart.

In other examples, the plurality of bosses 310 are each formed as small bosses that are spaced apart.

In other examples, the plurality of bosses 310 includes large bosses and small bosses spaced apart; alternatively, the plurality of bosses 310 include bosses of at least two different sizes.

That is, the plurality of protrusions 310 on the pole 300 may or may not have the same size, and when the plurality of protrusions 310 on the pole 300 have the same size, the plurality of protrusions 310 are formed as protrusions 310 having a larger size; or, the plurality of bosses 310 are each formed as a boss 310 having a smaller volume; when the plurality of protrusions 310 on the pole 300 are not uniform in volume size, part of the protrusions 310 among the plurality of protrusions 310 may be formed as small bosses and the other part of the protrusions 310 may be formed as large bosses.

Optionally, the overcurrent requirement I of the pole 200 and the overcurrent capability of the pole 300 satisfy the following relation:

wherein mu ₃ Is the overcurrent coefficient of the boss 310; n1 is the number of bosses 310; Δs' is the mating area of the post 300 and the second conductive adhesive layer 410 increased by the protrusion 310; mu (mu) ₄ Is the overcurrent coefficient of the pole 300; s3 is the actual area of the first surface 350.

Through the arrangement, the overcurrent capability of the pole 300 can be effectively ensured to meet the overcurrent requirement of the pole core 200, so that the phenomenon that the pole core 200 is insufficient in overcurrent is avoided, the problem that the pole core 200 generates serious heat is avoided, the service life of the pole core 200 is prolonged, and the use safety and the charging performance of the pole core 200 are improved.

Mu, in the form of a powder ₃ Can be determined directly from the material of the boss 310 and is expressed in a/mm ² The method comprises the steps of carrying out a first treatment on the surface of the Correspondingly, mu ₄ Can also be determined directly from the material of the pole 300 and is expressed in a/mm ² 。

Wherein μ is the same as the material of the tab 310 when the material of the tab 300 is the same as the material of the post 300 ₃ ＝μ ₄ 。

In a specific example, μ ₃ ＝μ ₄ ＝3A/mm ² ～12A/mm ² 。

It should be further noted that, the over-current requirement I of the pole core 200 may be determined according to the required charging time of the pole core 200, specifically, the determination manner is that, in the actual production process of the battery cell 1000, the fast charging time that the battery cell 1000 to be produced needs to meet may be directly determined, that is, the charging time of the battery cell 1000 may be clearly known, the charging time of the pole core 200 may be determined according to the charging time of the battery cell 1000, then the over-current requirement I of the pole core 200 may be obtained according to the charging time of the pole core 200, the actual area S3 of the first surface 350 may be obtained according to the size of the battery cell 1000, after the over-current requirement I of the pole core 200 and the actual area S3 of the first surface 350 are obtained, the number of the protruding portions 310 and the mating area of the pole post 300 and the second conductive adhesive layer 410 that the protruding portions 310 may be increased may be further rationalized by the above formula are further provided, so as to ensure that after the pole post 300 passes through the second conductive adhesive layer 410 and the pole core 200, the over-current capability of the pole post 300 and the over-current requirement I of the pole core 200 may meet certain conditions, thereby causing insufficient pole core 200 and causing the over-current 200 and serious problem of the over-current 200 may be avoided, and the problem of extending the life of the pole core 200 may be avoided.

In specific examples, the minimum overcurrent requirement of the pole piece 200 is i=75a-150A; the actual area s3=15 mm of the first surface 350 ² ～30mm ² 。

Alternatively, Δs' =s4-S5. Where S4 is the surface area of the protrusion 310, and S5 is the area of the first surface 350 covered by the protrusion 310.

That is, after the protruding portion 310 is disposed on the first surface 350, the mating area of the post 300 and the second conductive adhesive layer 410 increased by the protruding portion 310 is the difference between the actual surface area of the protruding portion 310 and the area of the part of the first surface 350 covered by the protruding portion 310 (the surface area of the part of the first surface 350 covered by the protruding portion 310 is defined as S5).

In specific examples, Δs' =0.1 mm ² ～5mm ² 。

Of course, in other examples, the pole 300 may also be provided with a recess (not shown in the example drawings) protruding away from the pole core 200, and the second conductive adhesive layer 410 is cooperatively connected in the recess. Here, when the pole 300 is electrically connected to the pole core 200 through the second conductive adhesive layer 410, a portion of the second conductive adhesive layer 410 may be filled in the concave portion to increase the connection area between the pole 300 and the pole core 200, so that the overcurrent area between the pole 300 and the pole core 200 can be increased while ensuring a higher connection strength between the pole 300 and the pole core 200, and the use safety and charging performance of the pole core 200 are improved.

The concave portion here means that the pole 300 is provided with a structural member recessed in a direction away from the pole core 200 so as to form the concave portion.

In a specific example, when the pole 300 is provided with a recess, during the process of connecting the pole 200 with the pole 300, the second conductive adhesive layer 410 may be coated on the first surface 350 of the pole 300 and in the recess, so that the second conductive adhesive layer 410 may be connected in the recess in a matching manner, and then, a side surface of the second conductive adhesive layer 410 away from the pole 300 is connected with the pole 200, so as to realize the electrical connection between the pole 200 and the pole 300; or, in the process of connecting the pole core 200 and the pole post 300, the second conductive adhesive layer 410 is coated on the pole core 200 first, then, one side surface of the second conductive adhesive layer 410 away from the pole core 200 is connected with the pole post 300, and in the process of connecting the pole post 300 and the second conductive adhesive layer 410, the pole post 300 can be pressed towards the second conductive adhesive layer 410 so as to promote the second conductive adhesive layer 410 to be filled in the concave part, and further, the second conductive adhesive layer 410 is partially connected in the concave part in a matching way, so that the electric connection between the pole core 200 and the pole post 300 is realized.

It should be noted that, the second conductive adhesive layer 410 is cooperatively connected in the recess, and the second conductive adhesive layer 410 may be filled in the whole recess, so as to increase the contact area between the pole 300 and the second conductive adhesive layer 410 to the maximum extent, and improve the connection strength; alternatively, the second conductive adhesive layer 410 fills part of the recess, so as to reduce difficulty in matching the recess with the second conductive adhesive layer 410, and reduce use cost of the second conductive adhesive layer 410.

In other examples, the protrusion 310 and the recess are on the post 300 at the same time. The protrusion 310 and the recess cooperate with the second conductive adhesive layer 410 to connect, and an increase in the connection area of the pole 300 and the pole core 200 can be achieved.

In some embodiments of the present utility model, as shown in fig. 17 and 18, a liquid injection hole 900 is formed in the pole 300, and a guide channel 320 is formed on a side of the pole 300 facing the pole core 200, where the guide channel 320 communicates with the liquid injection hole 900. That is, the present utility model is not limited to the arrangement of the liquid injection hole 900 on the cover plate 700, but the liquid injection hole 900 may be arranged on the pole 300, and when the liquid injection hole 900 is arranged on the pole 300, the liquid injection hole 900 is used to realize the communication of two opposite sides of the pole 300, thereby ensuring that the external electrolyte can be smoothly injected into the pole core 200 through the pole 300, achieving the purpose of injecting the electrolyte into the pole core 200, and ensuring the working performance of the pole core 200.

Meanwhile, by arranging the guide channel 320 communicated with the liquid injection hole 900, the guide channel 320 is mainly used for guiding the flow of the electrolyte so as to ensure that the electrolyte can fully permeate into the pole core 200, thereby achieving the purpose of accelerating the permeation of the electrolyte, improving the liquid injection effect and ensuring the performance of the pole core 200.

In some examples, as shown in fig. 17 and 18, the injection hole 900 extends in the axial direction of the pole 300 and penetrates the pole 300, and the injection hole 900 is provided in the radial middle of the pole 300. So that the electrolyte injection hole 900 can be used for effectively injecting external electrolyte into the pole core 200 smoothly, and meanwhile, the electrolyte injection hole 900 can be arranged right opposite to the radial middle part of the pole core 200, thereby ensuring that the electrolyte injected through the electrolyte injection hole 900 can quickly permeate the pole core 200 and ensuring the electrolyte injection effect.

As can be seen from the above, the pole 300 of the present application is provided with the guide channel 320 and the injection hole 900, during the actual injection process, the electrolyte can be injected toward the pole core 200 through the injection hole 900, and during the injection process, the guide channel 320 can be used to provide guide for the flow of the electrolyte, so that the electrolyte can be dispersed to different positions of the pole core 200, thereby improving the infiltration effect of the electrolyte on the pole core 200 and ensuring the working performance of the pole core 200.

Optionally, as shown in fig. 18, a plurality of guide channels 320 are disposed on a side of the pole 300 facing the pole core 200, the plurality of guide channels 320 are all communicated with the liquid injection hole 900, and the plurality of guide channels 320 cooperate to ensure that the electrolyte can effectively infiltrate different positions of the pole core 200, so as to further improve the infiltration effect of the electrolyte on the pole core 200, thereby improving the performance of the pole core 200.

Alternatively, as shown in fig. 18, the first surface 350 is provided with guide portions 360 protruding toward the pole core 200, and a guide passage 320 is formed between adjacent two of the guide portions 360. That is, the guide portion 360 protruding toward the pole core 200 is disposed on the first surface 350 to form the guide channel 320 on the first surface 350, so as to reduce the molding difficulty of the guide channel 320, and ensure the structural stability of the guide channel 320, and ensure that the guide channel 320 can effectively provide guidance for the flow of the electrolyte.

Optionally, as shown in fig. 18, a connection region 330 is further provided on the first surface 350, and the connection region 330 is spaced from the guide channel 320 on opposite sides of the guide portion 360. That is, after the guide portion 360 protruding toward the pole core 200 is disposed on the first surface 350, the connection region 330 can be formed on the first surface 350, so as to reduce the molding difficulty of the connection region 330.

Alternatively, the protruding portion 310 is disposed on the connection region 330, and the first surface 350 is electrically connected to the second conductive adhesive layer 410 through the connection region 330. That is, the connection region 330 is used for connection with the pole core 200, and electrical connection between the pole 300 and the pole core 200 is achieved. In addition, the second conductive adhesive layer 410 is disposed in the connection region 330, so that the second conductive adhesive layer 410 is not easy to overflow into the guide channel 320, and the second conductive adhesive layer 410 is prevented from blocking the guide channel 320 to reduce the infiltration effect.

Meanwhile, the protruding portion 310 is disposed in the connection region 330 to ensure that when the connection region 330 is in fit connection with the second conductive adhesive layer 410, the protruding portion 310 can be electrically connected with the second conductive adhesive layer 410, so as to improve the connection strength between the pole 300 and the second conductive adhesive layer 410, that is, improve the connection strength between the pole 300 and the pole core 200, and ensure the connection quality.

In some examples, the second conductive adhesive layer 410 is disposed between the connection region 330 and the pole core 200, and the second conductive adhesive layer 410 is connected to the connection region 330 and the pole core 200, respectively, so as to electrically connect the pole 300 and the pole core 200.

Optionally, as shown in fig. 18, the first surface 350 is provided with a plurality of groups of guiding parts 360, so as to form a plurality of guiding channels 320 and a plurality of connecting areas 330 on the first surface 350, the plurality of groups of guiding parts 360 are arranged at intervals along the circumferential direction of the first surface 350, the plurality of guiding channels 320 are used for ensuring that the electrolyte can effectively infiltrate into different positions of the pole core 200, and the infiltration effect of the electrolyte on the pole core 200 is further improved, so that the performance of the pole core 200 is improved; the plurality of connection regions 330 are used for increasing the connection area between the pole core 200 and the pole post 300, and ensuring the working performance of the pole core 200.

Optionally, as shown in fig. 18, the first surface 350 is further provided with a guiding portion 370 protruding toward the pole core 200, and the guiding portion 370 is surrounded on the periphery of the injection hole 900 to define a guiding area 371, where the guiding area 371 communicates the injection hole 900 with the guiding channel 320. So as to ensure that the electrolyte introduced through the electrolyte injection hole 900 can smoothly flow to the guide channel 320, thereby ensuring that the guide channel 320 can effectively guide the flow of the electrolyte, ensuring that the electrolyte can fully permeate into the pole core 200, achieving the purpose of accelerating the permeation of the electrolyte, improving the electrolyte injection effect and ensuring the performance of the pole core 200. And the flow guiding portion 370 can block the second conductive adhesive layer 410, so that the second conductive adhesive layer 410 is not easy to overflow into the liquid injection hole 900, and the second conductive adhesive layer 410 is prevented from blocking the liquid injection hole 900.

In some examples, as shown in fig. 18, the protruding height of the guiding portion 360 is identical to the protruding height of the guiding portion 370, so as to improve the guiding effect of the guiding portion 370, avoid the connection between the guiding region 371 and the connection region 330, that is, avoid the electrolyte from affecting the electrical connection between the pole 300 and the pole core 200, and avoid the conductive adhesive from flowing into the guiding region 371 to block the liquid injection hole 900.

Optionally, a portion of the first surface 350 is recessed away from the pole piece 200 to form a guide channel 320 (not shown in this example figure). That is, not only the guide portion 360 is provided on the first surface 350 to form the guide channel 320, but also a portion of the first surface 350 may be directly recessed away from the pole core 200 to form the guide channel 320, thereby reducing the difficulty in forming the guide channel 320 and simplifying the structure of the pole 300.

In a specific example, after the molding of the pole 300 is completed, a groove may be formed separately at a side of the pole 300 facing the pole core 200 to form the guide channel 320.

Alternatively, when the guide part 360 is formed, the protrusion height of the protrusion part 310 is smaller than the protrusion height of the guide part 360. The second conductive adhesive layer 410 is prevented from being formed between the guide channel 320 and the pole piece 200 in the process of bonding the pole piece 200 and the pole piece 300 by using the second conductive adhesive layer 410, that is, the second conductive adhesive layer 410 is prevented from blocking the guide channel 320, so that the guide channel 320 can effectively guide the flow of the electrolyte.

In some embodiments of the present utility model, as shown in connection with fig. 3 and 5, the battery cell 1000 further includes an insulating member 500, the insulating member 500 being disposed within the housing 100 and between the second tab 220 and the housing 100, and the post 300 being connected to the second tab 220 through the insulating member 500. In order to prevent the second tab 220 from contacting the housing 100 and forming an electrical connection to cause a short circuit during the electrical connection of the tab 300 and the second tab 220, thereby ensuring the operation performance of the battery cell 1000.

In some examples, the insulator 500 has a through hole, and one end of the pole 300 is connected to the second tab 220 through the through hole, so as to electrically connect the pole 300 to the pole core 200.

Wherein, the schematic view of the insulator 500 when being matched with the pole 300 can be seen in fig. 19.

Optionally, the insulating member 500 is made of an insulating material (plastic, rubber, etc.), so that when the insulating member 500 is used to realize the insulating fit between the pole core 200 and the housing 100, the mutual damage caused by the collision between the insulating member 500 and the pole core 200 can be avoided, thereby prolonging the service life of the pole core 200 and improving the use safety of the pole core 200.

Optionally, as shown in fig. 5 and 19, a mating portion 510 is disposed on a side of the insulating member 500 facing the pole core 200, and the mating portion 510 mates with the pole core 200 to enclose a current-limiting space 520 for blocking the flow of the adhesive layer, and the second conductive adhesive layer 410 is located in the current-limiting space 520. So as to prevent the glue layer from flowing by using the matching portion 510, and prevent the glue layer from flowing towards the outside of the current limiting space 520, that is, prevent the second conductive adhesive layer 410 for electrically connecting the pole 300 and the pole core 200 from flowing to the housing 100, thereby preventing the second conductive adhesive layer 410 from connecting the pole 300 and the housing 100 and preventing the second conductive adhesive layer 410 from connecting the second tab 220 and the housing 100 to cause a short circuit, and ensuring the working performance of the battery cell 1000.

In some embodiments of the present utility model, as shown in fig. 19, the mating portion 510 includes an annular abutment protrusion 511, and the abutment protrusion 511 extends toward the direction approaching the pole core 200 to be in contact with the second tab 220. That is, the stopping protrusion 511 is formed in a ring shape and the stopping protrusion 511 contacts the second tab 220 so as to enclose the flow limiting space 520 for blocking the flow of the adhesive layer by the engagement of the engagement portion 510 with the second tab 220.

By forming the stopping protrusion 511 into a ring shape, on one hand, the molding difficulty of the stopping protrusion 511 can be reduced, and the manufacturing effect can be improved, and on the other hand, the shape of the stopping protrusion 511 can be adapted to the shape of the second conductive adhesive layer 410, that is, the shape of the enclosed current-limiting space 520 is adapted to the shape of the second conductive adhesive layer 410, so that the second conductive adhesive layer 410 is arranged to be located in the current-limiting space 520.

Of course, in other examples, the stopping protrusion 511 may be formed in a square shape, an oval shape, or the like, and the present application is not particularly limited as long as it is ensured that the second conductive adhesive layer 410 can be effectively located in the current limiting space 520.

Alternatively, as shown in fig. 19, the stopping protrusions 511 are provided around the outer circumference of the pole 300 and spaced apart from the pole 300. Because the second conductive adhesive layer 410 mainly connects the pole 300 and the second tab 220, the stopping protrusion 511 is disposed around the periphery of the pole 300, so that when the second conductive adhesive layer 410 is used to connect the pole 300 and the second tab 220, the second conductive adhesive layer 410 can be located in the current-limiting space 520 surrounded by the stopping protrusion 511, so that the stopping protrusion 511 is used to stop the second conductive adhesive layer 410 from flowing, and the working performance of the battery cell 1000 is ensured.

It should be noted that, since the glue layer may overflow during the extrusion process, the stop protrusion 511 and the pole 300 are disposed at intervals in the present application, so as to prevent the stop protrusion 511 from blocking the slight flow of the second conductive adhesive layer 410, that is, ensure that the second conductive adhesive layer 410 can flow during the extrusion process, thereby facilitating the electrical connection between the pole 300 and the second tab 220 by using the second conductive adhesive layer 410.

That is, the second conductive adhesive layer 410 of the present application may flow during the connection process, but may not flow to the case 100, so as to facilitate the electrical connection of the electrode post 300 and the electrode core 200 and to secure the operation performance of the battery cell 1000.

Alternatively, at least a portion of the cross section of the pole 300 is formed in a circular shape, and the radial distance between the stopper protrusion 511 and the pole 300 in the radial direction of the pole 300 is greater than 2mm. So as to realize the interval arrangement of the stopping protrusion 511 and the pole 300, thereby avoiding the stopping protrusion 511 from obstructing the slight flow of the second conductive adhesive layer 410, so as to realize the electric connection of the pole 300 and the pole core 200 by using the second conductive adhesive layer 410 and ensure the connection quality.

In some examples, the radial distance between the stop protrusion 511 and the pole 300 is 3mm, 4mm, 5mm, or the like.

Alternatively, as shown in fig. 6, the mating portion 510 includes a plurality of abutment protrusions 511, and the plurality of abutment protrusions 511 are sleeved in sequence. To further ensure that the mating portion 510 can effectively block the glue layer from flowing, that is, prevent the second conductive adhesive layer 410 from flowing to the housing 100, and ensure the working performance of the battery cell 1000.

Alternatively, the radial distance between two adjacent abutment projections 511 is greater than 1mm. So that the plurality of stopping protrusions 511 can be sleeved in sequence, and the plurality of stopping protrusions 511 can be matched to stop the glue layer from flowing.

In some examples, the radial distance between two adjacent stop protrusions 511 may be 2mm, 3mm, 4mm, or the like.

It should be noted that, as shown in fig. 6, when the matching portion 510 includes a plurality of stopping protrusions 511, the stopping protrusions 511 near the pole 300 cooperate with the second tab 220 to enclose a current-limiting space 520 for blocking the glue layer flowing, and the second conductive adhesive layer 410 is located in the current-limiting space 520, so as to achieve that the stopping protrusions 511 cooperate with blocking the glue layer flowing, thereby improving the blocking effect.

Optionally, a plurality of stop protrusions 511 are integrally formed with the insulator 500. Here, it can be also understood that the plurality of stopping protrusions 511 are integrally formed on the insulating member 500, so as to reduce the forming difficulty of the plurality of stopping protrusions 511, and meanwhile, the connecting difficulty between the plurality of stopping protrusions 511 and the insulating member 500 can be reduced, so that the connecting quality is ensured, the plurality of stopping protrusions 511 can be stably arranged on the insulating member 500, thereby facilitating the use of the plurality of stopping protrusions 511 to cooperate with the blocking adhesive layer to flow, and improving the blocking effect.

Of course, in other examples, the plurality of stopping protrusions 511 may be provided on the insulating member 500 by welding, bonding, or the like, so as to achieve stable connection between the stopping protrusions 511 and the insulating member 500.

Alternatively, the stopping protrusion 511 near the outer circumferential wall of the insulator 500 is spaced apart from the outer circumferential wall of the insulator 500 with a minimum distance of more than 2mm. To ensure that the stopping protrusions 511 near the outer circumferential wall of the insulator 500 can effectively contact the pole core 200, thereby ensuring that the stopping protrusions 511 near the outer circumferential wall of the insulator 500 can effectively block the flow of the second conductive adhesive layer 410, and ensuring the blocking effect of the stopping protrusions 511.

In some examples, the distance between the abutment protrusion 511 near the outer peripheral wall of the insulator 500 and the outer peripheral wall of the insulator 500 is 3mm, 4mm, 5mm, or the like.

Optionally, as shown in fig. 1, the battery cell 1000 further includes an insulating film 800, where the insulating film 800 is disposed on the periphery of the pole core 200 and between the pole core 200 and the housing 100, so as to further avoid a short circuit caused by direct electrical connection between the pole core 200 and the housing 100, and ensure the working performance of the battery cell 1000.

In some embodiments of the present utility model, as shown in fig. 3 and 5, the battery cell 1000 further includes a sealing member 600, wherein the housing 100 is provided with a vent hole, the post 300 is connected to the second tab 220 through the vent hole, and the sealing member 600 is provided at the vent hole and located between the post 300 and the housing 100. That is, the sealing member 600 is disposed between the pole 300 and the housing 100, so that the pole 300 and the housing 100 are prevented from being electrically connected to cause a short circuit, and the sealing member can also function as a fit gap between the pole 300 and the housing 100 to prevent external foreign matters, dust, etc. from entering the housing 100 through the gap between the pole 300 and the housing 100, that is, to prevent the external foreign matters, dust, etc. from affecting the pole core 200, so as to prolong the service life of the pole core 200.

In some examples, the seal 600 is formed as a rubber member, which may also enhance the sealing effect of the seal 600 while ensuring that electrical connection of the pole 300 with the housing 100 is effectively avoided with the seal 600.

Alternatively, as shown in fig. 5, a partial seal 600 is provided between the insulator 500 and the housing 100. To avoid the glue layer flowing between the insulating member 500 and the housing 100, that is, to avoid the glue layer flowing between the insulating member 500 and the housing 100 to realize the electrical connection between the pole 300 and the housing 100, thereby avoiding the short circuit of the battery cell 1000 and further ensuring the working performance of the battery cell 1000.

Optionally, the thickness of the first conductive adhesive layer 420 and the second conductive adhesive layer 410 ranges from 0.05mm to 0.5mm. When the thickness of the first conductive adhesive layer 420 and the second conductive adhesive layer 410 is smaller than 0.05mm, the adhesive effect of the first conductive adhesive layer 420 and the second conductive adhesive layer 410 is reduced, and the protruding portion 310 on the pole 300 cannot be disposed in the second conductive adhesive layer 410 and the boss 720 of the cover plate 700 cannot be disposed in the first conductive adhesive layer 420, so that the connection strength of the pole 300, the cover plate 700 and the pole core 200 is reduced; when the thickness of the first conductive adhesive layer 420 and the second conductive adhesive layer 410 is greater than 0.5mm, the occupied space of the first conductive adhesive layer 420 and the second conductive adhesive layer 410 is larger, and the capacity of the electrode core 200 is reduced on the premise of a certain size of the housing 100, so that the capacity of the battery cell 1000 is reduced, and the use cost of the first conductive adhesive layer 420 and the second conductive adhesive layer 410 is increased.

Therefore, the thickness range of the first conductive adhesive layer 420 and the second conductive adhesive layer 410 is set to be 0.05 mm-0.5 mm, so that the connection strength of the pole 300, the cover plate 700 and the pole core 200 is improved, the capacity of the pole core 200 is ensured, and the use cost of the first conductive adhesive layer 420 and the second conductive adhesive layer 410 is reduced.

In specific examples, the thickness of the first conductive adhesive layer 420, the second conductive adhesive layer 410 is 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, or the like.

Optionally, the first tab 210 and the second tab 220 each form a full tab. So as to improve the discharge power and the fast charge capability of the pole core 200, and simultaneously, the use safety of the pole core 200 and the production efficiency of the pole core 200 can be improved.

It should be noted that, since the first tab 210 and the second tab 220 of the present application are electrically connected to the post 300 and the cover 700 by using an adhesive method, there is no problem of difficult connection compared with welding, and therefore, the present application forms the first tab 210 and the second tab 220 as full tabs to ensure the performance of the core 200.

The above-mentioned all-tab may be formed by mechanical rolling after winding, or may be formed by lamination after winding, and the present application is not particularly limited.

Optionally, the pole core 200 comprises a first pole piece comprising a first tab 210 and a second pole piece comprising a second tab 220. In this way, when the first tab 210 is electrically connected to the cover plate 700, the first pole piece is electrically connected to the cover plate 700, and correspondingly, when the second tab 220 is electrically connected to the pole 300, the second pole piece is electrically connected to the pole 300, so as to provide electric energy by using the battery cell 1000.

In a specific example, the first tab is formed as a negative tab such that the first tab 210 is formed as a negative tab and the second tab is formed as a positive tab such that the second tab 220 is formed as a positive tab.

Alternatively, the first pole piece and the second pole piece are both made of a composite foil 230, as shown in fig. 20, where the composite foil 230 includes a plastic layer 231 and a metal layer 232, and the metal layer 232 is disposed on two opposite sides of the plastic layer 231. The weight of the first pole piece and the second pole piece is reduced, namely the weight of the pole core 200 is reduced, and meanwhile, the production cost of the pole core 200 can be reduced.

In summary, it can be understood that the first tab 210 and the second tab 220 are made of the composite foil 230, so that the weight of the first tab 210 and the second tab 220 and the production cost of the first tab 210 and the second tab 220 can be reduced while the first tab 210 and the second tab 220 are ensured to form the conductive member, and the weight of the battery 1000 can be reduced.

Alternatively, the plastic layer 231 may be made of PET (polyethylene terephthalate) or PP (Polypropylene) to achieve weight saving of the first and second pole pieces.

Alternatively, the metal layer 232 may be formed as an aluminum layer or a copper layer such that the metal layer 232 has a certain conductive property so as to electrically connect the first pole piece with the cap plate 700 and electrically connect the second pole piece with the pole 300.

The battery pack of the embodiment of the present utility model is described below.

A battery pack according to an embodiment of the present utility model includes: a plurality of battery cells 1000.

The battery cell 1000 is the aforementioned battery cell 1000, and the specific structure of the battery cell 1000 is not described herein.

As can be seen from the above structure, the battery pack according to the embodiment of the present utility model, by adopting the foregoing battery cell 1000, can effectively reduce the manufacturing difficulty and manufacturing cost of the battery pack, and simultaneously can also enable the battery pack to have the advantages of large capacity, good structural reliability, and the like.

The following describes electric equipment according to an embodiment of the present utility model.

An electric device according to an embodiment of the present utility model includes: and a battery pack.

The battery pack is the aforementioned battery pack, and the specific structure of the battery pack is not described herein.

According to the structure, the electric equipment provided by the embodiment of the utility model can effectively reduce the manufacturing difficulty and the manufacturing cost of the electric equipment and can also ensure the reliability of the electric equipment by adopting the battery pack, namely the battery cell 1000.

The electric equipment can be a vehicle, an energy storage cabinet, a ship or an aircraft.

Three connections 710 are shown in fig. 6 and 7 for illustrative purposes, but it is apparent to one of ordinary skill in the art after reading the above disclosure that it is within the scope of the present utility model to apply the disclosure to two, four, or more connections 710.

Other configurations of battery cells 1000, battery packs, and powered devices according to embodiments of the present utility model are known to those of ordinary skill in the art and will not be described in detail herein.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell, comprising:

a housing forming a receiving cavity having an opening;

the pole core is arranged in the accommodating cavity;

the cover plate is arranged at the opening, a protruding connecting part is arranged on one side, facing the accommodating cavity, of the cover plate, a reinforcing part is arranged on the connecting part, and the connecting part and the reinforcing part are electrically connected with the first lug of the pole core through a first conductive adhesive layer.

2. The battery cell according to claim 1, wherein the protruding height of the connection portion ranges from 0.2mm to 1.5mm.

3. The battery cell of claim 1, wherein the reinforcement is formed as a boss that is located within the first conductive adhesive layer.

4. A battery cell according to claim 3, wherein the extension height of the boss in the thickness direction of the cover plate ranges from 0.2mm to 0.8mm.

5. A battery cell according to claim 3, wherein the connecting portion is provided with a plurality of bosses, and a plurality of the bosses are arranged at intervals.

6. The battery cell as recited in claim 5, wherein the cover plate forms a circular cover plate, and the plurality of bosses are sequentially spaced apart in a circumferential direction and/or a radial direction of the cover plate.

7. The battery cell of claim 3, wherein the boss is one or more of a hemispherical boss, a frustoconical boss, or a tapered boss.

8. The battery cell of claim 3, wherein the overcurrent requirement I of the electrode core and the overcurrent capability of the cover plate satisfy the following relationship:

wherein mu ₁ The overcurrent coefficient of the boss; n is the number of the bosses; Δs is the mating area of the connection portion and the first conductive adhesive layer increased by the boss; mu (mu) ₂ The overcurrent coefficient of the connecting part; s0 is the same asThe actual area of the connection.

9. The battery cell of claim 1, wherein the cover plate is provided with an explosion-proof valve configured to be opened to vent gas when subjected to a set pressure, the explosion-proof valve being spaced apart from the connection portion.

10. The battery cell of claim 9, wherein the plurality of connection portions are provided in plurality, and the plurality of connection portions and the explosion-proof valve are disposed at intervals along the circumferential direction of the cap plate.

11. The battery cell as recited in claim 9, wherein the cover plate is provided with a plurality of connection portions, and an exhaust passage is formed between two adjacent connection portions, and the exhaust passage communicates with the explosion-proof valve.

12. The battery cell of claim 11, wherein a minimum distance between two adjacent connection portions ranges from 1mm to 5mm.

13. The battery cell of claim 1, further comprising a post disposed on the housing, the post being connected to a second tab of the pole core by a second conductive adhesive layer.

14. The battery cell of claim 13, wherein the first conductive adhesive layer and the second conductive adhesive layer have a thickness ranging from 0.05mm to 0.5mm.

15. The battery cell of claim 13, wherein the pole core comprises a first pole piece and a second pole piece, the first pole piece comprising the first tab and the second pole piece comprising the second tab;

the first pole piece and the second pole piece are both made of composite foil materials, and the composite foil materials comprise plastic layers and metal layers arranged on two opposite sides of the plastic layers.

16. The battery cell of any one of claims 1-15, wherein the battery cell is a cylindrical battery.

17. A battery pack comprising a plurality of the battery cells according to any one of claims 1-16.

18. A powered device comprising the battery pack of claim 17.