CN218896807U

CN218896807U - Lower plastic part of top cover assembly, top cover assembly with same and battery cell

Info

Publication number: CN218896807U
Application number: CN202223251520.9U
Authority: CN
Inventors: 李奇
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2022-12-05
Filing date: 2022-12-05
Publication date: 2023-04-21
Anticipated expiration: 2032-12-05

Abstract

The utility model discloses a lower plastic part of a top cover assembly, the top cover assembly and a battery cell with the same, wherein the top cover assembly comprises a cover plate and the lower plastic part, a liquid injection hole is formed in the cover plate, the lower plastic part is arranged on one side of a shell of the cover plate, which faces towards the battery cell, an electrolyte buffer cavity is formed in the lower plastic part, the electrolyte buffer cavity is communicated with the liquid injection hole, a through liquid through hole is formed in the bottom wall of the electrolyte buffer cavity, and the through liquid through hole is communicated between the electrolyte buffer cavity and the shell of the battery cell. According to the lower plastic part of the top cover assembly, the buffer cavity is arranged on the lower plastic part, so that electrolyte is prevented from being pumped out of the accommodating cavity of the shell of the battery cell when negative pressure vacuumizing is carried out, the total amount of the electrolyte in the accommodating cavity of the shell is maintained unchanged, and therefore, the full infiltration of the pole pieces in the accommodating cavity is ensured.

Description

Lower plastic part of top cover assembly, top cover assembly with same and battery cell

Technical Field

The utility model relates to the technical field of battery cells, in particular to a lower plastic part of a top cover assembly, the top cover assembly with the lower plastic part and a battery cell.

Background

At present, electrolyte is injected from a liquid injection hole and flows into the battery cell through the liquid injection through hole, so that the battery cell is soaked, and the performance of the battery cell is ensured. However, after the electrolyte is injected into the battery cell, the electrolyte cannot fully infiltrate the battery cell in a short time, so that the battery cell is difficult to fully infiltrate, and the electrolyte can be drawn out of the battery cell under the condition of negative pressure vacuumizing, so that the performance of the battery cell cannot be ensured.

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 aims to provide the lower plastic part of the top cover assembly, which can ensure the sufficient infiltration of the battery cells and can not cause the extraction of electrolyte from the battery cells under the condition of negative pressure vacuumizing.

The utility model also provides a top cover assembly with the lower plastic part of the top cover assembly.

The utility model further provides a battery cell with the top cover assembly.

According to the lower plastic part of the top cover assembly, the top cover assembly comprises a cover plate and the lower plastic part, the cover plate is provided with a liquid injection hole, and the lower plastic part is arranged on one side of the cover plate, which faces the shell of the battery cell.

According to the lower plastic part of the top cover assembly, the buffer cavity is arranged on the lower plastic part, so that electrolyte is prevented from being pumped out of the accommodating cavity of the shell of the battery cell when negative pressure vacuumizing is carried out, the total amount of the electrolyte in the accommodating cavity of the shell is maintained unchanged, and therefore, the full infiltration of the pole pieces in the accommodating cavity is ensured.

According to some embodiments of the utility model, the liquid passing holes include a plurality of liquid passing holes, and the plurality of liquid passing holes are arranged at intervals along the length direction and/or the width direction of the lower plastic part.

According to some embodiments of the utility model, the lower plastic part comprises a buffer section and a pole mounting section which are arranged along the length direction, the electrolyte buffer cavity is formed on the buffer section, the pole mounting section is connected with the buffer section, and a mounting part for mounting the pole is arranged on the pole mounting section.

According to some alternative embodiments of the utility model, the pole mounting section comprises two, two pole mounting sections symmetrically arranged on both sides of the buffer section.

According to some embodiments of the utility model, one of the buffer section and the pole mounting section is provided with a plug hole and the other is provided with a plug post, and the plug post is matched in the plug hole so as to fixedly connect the buffer section and the pole mounting section.

According to some embodiments of the utility model, the buffer section is provided with a reinforcing rib, the reinforcing rib extends along the length direction and/or the width direction of the lower plastic part, and the reinforcing rib is arranged in the electrolyte buffer cavity and/or on one side of the buffer section, which is away from the cover plate.

According to some embodiments of the utility model, the top of the electrolyte buffer cavity is open, an explosion-proof boss is arranged in the electrolyte buffer cavity, an air hole penetrating through the explosion-proof boss along the thickness direction of the lower plastic part is formed in the explosion-proof boss, and the explosion-proof boss is in sealing connection with the periphery of the explosion-proof valve.

According to some embodiments of the utility model, the lower molding has a thickness of 5mm to 10mm.

According to the top cover assembly of the second aspect of the embodiment of the utility model, the top cover assembly comprises a cover plate and a lower plastic part of the top cover assembly of the first aspect of the utility model, wherein the cover plate is provided with a liquid injection hole, the lower plastic part is arranged on one side of the cover plate, which faces the shell of the battery cell, and the liquid injection hole is communicated with the electrolyte buffer cavity.

According to the top cover assembly, through the arrangement of the top cover assembly, the full infiltration of the pole piece is ensured.

According to a third aspect of the utility model, a battery cell comprises a shell, a pole piece and a top cover assembly of the second aspect of the utility model, wherein the shell is provided with a containing cavity with one side open, the pole piece is arranged in the containing cavity, and the top cover assembly covers the open side of the containing cavity.

According to the battery cell, the battery cell is arranged, so that the full infiltration of the pole piece is ensured.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

FIG. 1 is a schematic diagram of a cell according to an embodiment of the utility model;

FIG. 2 is an exploded view of the header assembly shown in FIG. 1;

FIG. 3 is a schematic view of an angle of the header assembly shown in FIG. 1;

FIG. 4 is a schematic view of yet another angle of the header assembly shown in FIG. 1;

FIG. 5 is a schematic view of another angle of the header assembly shown in FIG. 1;

FIG. 6 is a schematic view of yet another angle of the header assembly shown in FIG. 1;

FIG. 7 is a schematic view of an angle of the bumper section of the lower molding shown in FIG. 6;

FIG. 8 is a schematic view of another angle of the bumper section of the lower molding shown in FIG. 6;

FIG. 9 is a schematic view of an angle of the mounting section of the lower molding shown in FIG. 8;

fig. 10 is a schematic view of another angle of the mounting section of the lower molding shown in fig. 8.

Reference numerals:

100. a top cover assembly;

10. a cover plate; 11. a liquid injection hole; 12. an explosion-proof valve hole; 13. a mounting groove;

20. a lower plastic part; 21. a buffer section; 211. an electrolyte buffer chamber; 2111. a liquid passing hole; 212. a plug-in column; 213. reinforcing ribs; 214. explosion-proof boss; 2141. ventilation holes; 22. a pole mounting section; 221. a mounting part; 222. a plug hole;

30. an explosion-proof valve;

40. a protective sheet;

50. a lower pole;

60. a seal ring;

70. applying a plastic part;

80. an upper pole;

200. a housing;

1000. and a battery cell.

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 and intended to explain the present utility model and should not be construed as limiting the utility model.

The lower molding 20 of the top cap assembly according to the embodiment of the present utility model is described below with reference to fig. 1 to 10.

Referring to fig. 2, the cap assembly 100 includes a cap plate 10 and a lower molding 20 of the cap assembly according to the first aspect of the present utility model. The cover plate 10 is provided with a liquid injection hole 11, the lower plastic part 20 is arranged on one side of the cover plate 10 facing the shell 200 of the battery cell 1000, the lower plastic part 20 is provided with an electrolyte buffer cavity 211, the electrolyte buffer cavity 211 is communicated with the liquid injection hole 11, the bottom wall of the electrolyte buffer cavity 211 is provided with a through liquid through hole 2111, and the through liquid through hole 2111 is communicated between the electrolyte buffer cavity 211 and the shell 200 of the battery cell 1000.

For example, as shown in fig. 1 and 2, the top cover assembly 100 is disposed at the upper part of the housing 200 of the battery cell 1000, the housing 200 of the battery cell 1000 is in a rectangular box shape, the top end of the housing 200 is open, the top cover assembly 100 covers the upper open mouth of the housing 200 of the battery cell 1000, a pole piece is disposed in the accommodation cavity of the housing 200, and the housing 200 can be filled with electrolyte. The top cover assembly 100 is provided with a cover plate 10 and a lower plastic part 20, the cover plate 10 is provided with a liquid injection hole 11, the lower plastic part 20 is provided with an electrolyte buffer cavity 211, the bottom of the electrolyte buffer cavity 211 is provided with a liquid through hole 2111, and electrolyte circulates among the liquid injection hole 11, the electrolyte buffer cavity 211 and the accommodating cavity of the shell 200.

In the process that electrolyte is injected into the accommodating cavity of the shell 200, the electrolyte firstly flows into the electrolyte buffer cavity 211 formed by the lower plastic part 20 from the liquid injection hole 11, then flows into the accommodating cavity of the shell 200 through the liquid passing hole 2111 at the bottom of the electrolyte buffer cavity 211 so as to infiltrate the pole piece in the accommodating cavity, when negative pressure vacuumizing is carried out, the electrolyte buffer cavity 211 prevents the electrolyte from being extracted from the battery core 1000, and the total amount of the electrolyte in the battery core 1000 is kept unchanged, so that the electrolyte is fully infiltrated into the pole piece. In addition, even if part of electrolyte is pumped into the electrolyte buffer cavity 211 from the containing cavity, the electrolyte can be pressed back to the containing cavity by positive pressure, and the electrolyte in the containing cavity is supplemented, so that the full infiltration of the pole piece in the containing cavity is further ensured. Through earlier to hold the intracavity injection electrolyte, then negative pressure evacuation, at last with the electrolyte pressure in holding the intracavity through the malleation, cyclic reciprocation, under the effect of electrolyte buffer chamber 211, guaranteed the abundant infiltration of pole piece to the working property of electricity core 1000 has been guaranteed.

According to the lower plastic part 20 of the top cover assembly, through the arrangement of the electrolyte buffer cavity 211 on the lower plastic part 20, electrolyte can be prevented from being pumped out of the containing cavity of the shell 200 of the battery cell 1000 when vacuumizing under negative pressure, the total amount of the electrolyte in the containing cavity of the shell 200 is maintained unchanged, so that the sufficient infiltration of the pole pieces in the containing cavity is ensured, and meanwhile, even if part of electrolyte is pumped into the electrolyte buffer cavity 211 from the containing cavity, the electrolyte can be hydraulically returned into the containing cavity through positive pressure, so that the sufficient infiltration of the pole pieces in the containing cavity is further ensured.

According to some embodiments of the present utility model, referring to fig. 2, the liquid passing holes 2111 include a plurality, that is, the number of the liquid passing holes 2111 may be two, three or four or more, and the plurality of liquid passing holes 2111 are arranged at intervals along the length direction (left-right direction as shown in fig. 2) and/or the width direction (front-rear direction as shown in fig. 2) of the lower molding 20. That is, the plurality of liquid passing holes 2111 may be arranged at intervals in only the longitudinal direction, the plurality of liquid passing holes 2111 may be arranged at intervals in only the width direction, and the plurality of liquid passing holes 2111 may be arranged at intervals in both the longitudinal direction and the width direction. In this embodiment, through the plurality of via holes 2111 arranged at intervals in the length direction and the width direction, when electrolyte is injected, the electrolyte in the electrolyte buffer cavity 211 can flow to the accommodating cavity through a plurality of positions in the length direction and the width direction, so that the electrolyte can be injected more uniformly in the length direction and the width direction of the housing 200, the electrolyte in the accommodating cavity is distributed uniformly, and the infiltration effect on pole pieces at each position in the accommodating cavity is improved. In addition, the efficiency of the electrolyte flowing into the accommodating cavity from the liquid through hole 2111 is improved, and meanwhile, the electrolyte is guaranteed to fully infiltrate the polar plate in the length direction.

According to some embodiments of the present utility model, referring to fig. 2, the lower molding 20 includes a buffer section 21 and a post mounting section 22 arranged in a length direction (left-right direction as viewed in fig. 2), an electrolyte buffer chamber 211 is formed on the buffer section 21, the post mounting section 22 is connected to the buffer section 21, and a mounting portion 221 for mounting a post is provided on the post mounting section 22. The pole can be installed on the pole installation section 22 of the lower plastic part 20, so that the assembly of the pole and the lower plastic part 20 can be facilitated, the lower plastic part 20 is a plastic part, the electrical insulation performance between the pole and the top cover can be ensured, and the safety performance is improved.

According to some alternative embodiments of the present utility model, the pole mounting section 22 includes two pole mounting sections 22 symmetrically arranged on both sides of the buffer section 21. Through arranging two symmetrical pole installation sections 22 for two pole installation sections 22 are arranged at buffer section 21 in length direction, from this, can increase the interval between positive pole and the negative pole, avoid the short circuit between positive pole and the negative pole, make the structural arrangement of electric core 1000 more reasonable.

According to some embodiments of the present utility model, referring to fig. 7 and 9, one of the buffer section 21 and the pole mounting section 22 is provided with a socket hole 222 and the other is provided with a socket post 212, and the socket post 212 is fitted into the socket hole 222 to fixedly connect the buffer section 21 and the pole mounting section 22. Further, the plug post 212 is non-circular, and the plug post 212 and the plug hole 222 are matched, so that the rotation of the pole mounting section 22 relative to the buffer section 21 is avoided, and the fixed connection of the pole mounting section 22 and the buffer section 21 is realized.

For example, as shown in fig. 7 and 9, the buffer section 21 is provided with a non-circular plug-in post 212, and for example, the plug-in post 212 may have a shape of: the cross section of the plug-in column 212 can be semicircular or elliptic, and the plug-in hole 222 matched with the plug-in column 212 is arranged on the pole mounting section 22, so that the pole mounting section 22 and the buffer section 21 are fixedly connected.

According to some embodiments of the present utility model, referring to fig. 7 and 8, the buffer section 21 is provided with the reinforcing ribs 213, and the reinforcing ribs 213 may extend in the longitudinal direction (the left-right direction as shown in fig. 2) and/or the width direction (the front-rear direction as shown in fig. 2) of the lower molding 20, that is, the reinforcing ribs 213 may extend in the longitudinal direction of the lower molding 20, or may extend in the width direction of the lower molding 20, or may extend in both the longitudinal direction and the width direction of the lower molding 20, and the reinforcing ribs 213 may be disposed in the electrolyte buffer cavity 211 and/or on the side of the buffer section 21 facing away from the cover plate 10, that is, the reinforcing ribs 213 may be disposed in the electrolyte buffer cavity 211, or may be disposed on the side of the buffer section 21 facing away from the cover plate 10, or may be disposed in the electrolyte buffer cavity 211 and on the side of the buffer section 21 facing away from the cover plate 10. Thereby, the strength of the buffer section 21 is improved, and the buffer section 21 is prevented from being deformed in the process of being matched with the pole mounting section 22.

For example, as shown in fig. 7, the reinforcing ribs 213 are provided in the electrolyte buffer chamber 211 and on the side of the buffer section 21 facing away from the cover plate 10, the reinforcing ribs 213 are provided to extend in the left-right direction and the front-rear direction of the lower molding member 20 on the side of the buffer section 21 facing away from the cover plate 10, and the reinforcing ribs 213 are provided to extend in the left-right direction of the lower molding member 20 inside the buffer chamber while being disconnected in the middle and spaced apart from the explosion-proof boss 214, so that the electrolyte flows in the buffer chamber.

According to some embodiments of the present utility model, referring to fig. 2, the top of the electrolyte buffer chamber 211 is opened, an explosion-proof boss 214 is provided in the electrolyte buffer chamber 211, and an air vent 2141 penetrating the explosion-proof boss 214 in the thickness direction (up-down direction as shown in fig. 2) of the lower molding 20 is formed on the explosion-proof boss 214. The explosion-proof boss 214 is arranged in the buffer cavity, so that the occupied space of the explosion-proof boss 214 is reduced, and meanwhile, the buffer cavity is partitioned by the long strip-shaped explosion-proof boss 214, and the diversion of electrolyte in the buffer cavity is promoted; the explosion-proof boss 214 is arranged to be in sealing connection with the explosion-proof valve 30, so that the gas exhausted by the explosion-proof valve 30 is prevented from flowing into the battery cell 1000, and the safety of the battery cell 1000 is ensured.

For example, as shown in fig. 2, the electrolyte buffer chamber 211 is opened at the upper part, the explosion-proof boss 214 is provided in the middle part of the buffer chamber, and extends in the left-right direction, and is elongated, the explosion-proof boss 214 is provided with an air hole 2141 penetrating the explosion-proof boss 214 in the up-down direction, the explosion-proof boss 214 is provided with an explosion-proof valve 30 at the upper part, the explosion-proof boss 214 is hermetically connected with the periphery of the explosion-proof valve 30, the explosion-proof valve 30 is welded to the upper side of the explosion-proof valve hole 12 of the cover plate 10, and the protection sheet 40 is flush with the periphery of the cover plate 10.

According to some embodiments of the present utility model, referring to fig. 1 and 2, the lower molding 20 has a thickness of 5mm-10mm. Therefore, the strength of the lower plastic part 20 is ensured, and meanwhile, the occupation of the too thick lower plastic part 20 to the space of the electrolyte buffer cavity 211 is reduced, so that the volume of the electrolyte buffer cavity 211 is ensured.

For example, the thickness of the lower molding 20 may be: 5mm, 6mm, 7mm, 8mm, 9mm, 10mm.

Referring to fig. 1, a top cap assembly 100 according to a second aspect of the present utility model includes a cap plate 10 and a lower molding member 20 of the top cap assembly of the first aspect of the present utility model, a liquid injection hole 11 is provided on the cap plate 10, the lower molding member 20 is provided on a side of the cap plate 10 facing a housing 200 of a battery cell 1000, and the liquid injection hole 11 is in communication with an electrolyte buffer chamber 211.

For example, as shown in fig. 2, the cap assembly 100 includes a cap plate 10 and a lower molding member 20, the cap plate 10 is provided with a liquid injection hole 11, and the lower molding member 20 is provided at a lower portion of the cap plate 10, and electrolyte may flow into the buffer chamber through the liquid injection hole 11.

According to the top cap assembly 100 of the embodiment of the present utility model, by providing the lower molding member 20 of the top cap assembly of the embodiment of the first aspect, the electrolyte buffer cavity 211 is provided on the lower molding member 20 of the first aspect, so that electrolyte can be prevented from being pumped out of the accommodating cavity of the housing 200 of the battery cell 1000 when the negative pressure is pumped out, the total amount of electrolyte in the accommodating cavity of the housing 200 is maintained unchanged, thereby ensuring sufficient infiltration of the pole pieces in the accommodating cavity, and simultaneously, even if part of electrolyte is pumped into the electrolyte buffer cavity 211 from the accommodating cavity, the electrolyte can be hydraulically returned into the accommodating cavity by positive pressure, thereby further ensuring sufficient infiltration of the pole pieces in the accommodating cavity.

Referring to fig. 1, a battery cell 1000 according to an embodiment of the third aspect of the present utility model includes a case 200, a pole piece, and a cap assembly 100 of the second aspect of the present embodiment, the case 200 having a receiving cavity with one side open, the pole piece being disposed in the receiving cavity, the cap assembly 100 closing the open side of the receiving cavity.

For example, as shown in fig. 1 and 2, the upper portion of the case 200 is opened to form a receiving cavity, the pole piece is disposed inside the receiving cavity, and the top cap assembly 100 seals the upper opening of the case 200 to form the battery cell 1000. Preferably, the length of the battery cell 1000 in the left-right direction is 200 mm-500 mm, and the width of the battery cell 1000 in the front-rear direction is 15 mm-55 mm.

According to the battery cell 1000 of the embodiment of the present utility model, by providing the top cap assembly 100 of the second aspect of the embodiment, and providing the lower molding member 20 of the top cap assembly of the first aspect of the embodiment to the top cap assembly 100 of the second aspect of the embodiment, and providing the electrolyte buffer cavity 211 on the lower molding member 20 of the first aspect, it is possible to avoid drawing out electrolyte from the accommodating cavity of the housing 200 of the battery cell 1000 when the negative pressure is vacuumized, maintain the total amount of electrolyte in the accommodating cavity of the housing 200 unchanged, thereby ensuring sufficient infiltration of the electrode sheet in the accommodating cavity, and simultaneously, even if part of electrolyte is drawn into the electrolyte buffer cavity 211 from the accommodating cavity, it is possible to press the electrolyte back into the accommodating cavity by positive pressure, thereby further ensuring sufficient infiltration of the electrode sheet in the accommodating cavity.

A cell 1000 according to an embodiment of the third aspect of the present utility model is described below with reference to fig. 1 to 10.

As shown in fig. 1 and 2, a battery cell 1000 according to an embodiment of the second aspect of the present utility model includes a case 200, a pole piece, and a top cap assembly 100.

The cap assembly 100 includes: the explosion-proof valve comprises a cover plate 10, a lower plastic part 20, an explosion-proof valve 30, a protection sheet 40, a lower pole 50, a sealing ring 60, an upper plastic part 70 and an upper pole 80.

The lower molding member 20 is installed at an upper opening of the case 200, the cap plate 10 is provided at an upper portion of the lower molding member 20, and the upper post 80 and the upper molding member 70 are provided at an upper side of the cap plate 10. The lower plastic part 20 is provided with a buffer section 21 and two pole mounting sections 22, the two pole mounting sections 22 are symmetrically arranged on the left side and the right side of the buffer section 21, the buffer section 21 is mounted in a matched mode through a plug-in hole 222 of the plug-in pole 212 and the pole mounting section 22, a through hole is formed in the pole mounting section 22 for the lower pole 50 to pass through, and an electrolyte buffer cavity 211 is formed in the buffer section 21. The cover plate 10 is provided with an explosion-proof valve hole 12, a liquid injection hole 11 and two mounting grooves 13, and through holes of the mounting grooves 13 correspond to through holes of the pole mounting sections 22.

The cover plate 10 on the upper side of the pole mounting section 22 is provided with mounting grooves 13 corresponding to the two pole mounting sections 22, the upper pole 80 is mounted in the mounting grooves 13, an upper plastic part 70 is arranged between the upper pole 80 and the groove wall of the mounting groove 13, the lower pole 50 passes through a through hole of the pole mounting section 22 to be connected with the pole mounting section 22, a sealing ring 60 is arranged between the lower pole 50 and the pole mounting section 22, and the lower pole 50 passes through a through hole of the mounting groove 13 of the cover plate 10 and a through hole of the upper plastic part 70 to be connected with the upper pole 80.

The reinforcing ribs 213 are disposed in the electrolyte buffer cavity 211 and on a side of the buffer section 21 facing away from the cover plate 10, and in the electrolyte buffer cavity 211, the reinforcing ribs 213 extend in the left-right direction of the lower molding 20, and on a side facing away from the cover plate 10, the reinforcing ribs 213 extend in the left-right direction and the front-rear direction of the lower molding 20. An explosion-proof boss 214 is arranged in the middle of the electrolyte buffer cavity 211, an air vent 2141 penetrating through the explosion-proof boss 214 is arranged on the upper portion of the explosion-proof boss 214, an explosion-proof valve 30 is arranged on the upper portion of the explosion-proof boss 214 and is in sealing connection with the periphery of the explosion-proof valve 30, a protection sheet 40 is arranged on the upper portion of the explosion-proof valve 30, and the protection sheet 40 is clamped on the explosion-proof valve hole 12 of the cover plate 10 and is flush with the periphery of the cover plate 10.

When electrolyte is injected into the pole piece in the battery core 1000, the electrolyte is injected into the electrolyte buffer cavity 211 from the electrolyte injection hole 11 in the cover plate 10, and after flowing in the electrolyte buffer cavity 211, the electrolyte flows into the accommodating cavity through the four electrolyte through holes 2111 at the bottom of the electrolyte buffer cavity 211, so that the infiltration of the pole piece in the accommodating cavity is completed.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

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. The utility model provides a top cap subassembly mould piece under, top cap subassembly includes apron and moulds the piece under, be equipped with the notes liquid hole on the apron, mould the piece under and locate one side of the casing of apron towards the electric core, its characterized in that, mould the piece under and be formed with electrolyte buffer chamber, electrolyte buffer chamber with annotate the liquid hole and communicate with each other, be equipped with the through-hole of passing through on the diapire of electrolyte buffer chamber, the through-hole intercommunication is in between the casing of electrolyte buffer chamber and electric core.

2. The lower molding member of the cap assembly of claim 1, wherein the plurality of liquid passing holes are arranged at intervals along a length direction and/or a width direction of the lower molding member.

3. The lower molding member of the cap assembly according to claim 1, wherein the lower molding member comprises a buffer section and a pole mounting section arranged along a length direction, the electrolyte buffer chamber is formed on the buffer section, the pole mounting section is connected with the buffer section, and a mounting portion for mounting the pole is provided on the pole mounting section.

4. The lower molding of the top cap assembly according to claim 3, wherein the pole mounting sections include two, and the two pole mounting sections are symmetrically disposed at both sides of the buffer section.

5. The lower molding member of the cap assembly according to claim 3, wherein one of the buffer section and the pole mounting section is provided with a socket hole and the other one is provided with a socket post, the socket post being fitted into the socket hole to fixedly connect the buffer section with the pole mounting section.

6. A lower molding member of a top cap assembly according to claim 3, wherein the buffer section is provided with a reinforcing rib, the reinforcing rib extends along the length direction and/or the width direction of the lower molding member, and the reinforcing rib is arranged in the electrolyte buffer cavity and/or on one side of the buffer section away from the cover plate.

7. The lower molding member of the top cap assembly according to claim 3, wherein the top of the electrolyte buffer chamber is opened, an explosion-proof boss is disposed in the electrolyte buffer chamber, an air vent penetrating through the explosion-proof boss in the thickness direction of the lower molding member is formed in the explosion-proof boss, and the explosion-proof boss is in sealing connection with the peripheral edge of the explosion-proof valve.

8. The lower molding of the cap assembly of claim 1, wherein the lower molding has a thickness of 5mm-10mm.

9. A header assembly, comprising: the cover plate and the lower plastic part of the top cover assembly of any one of claims 1-8, wherein the cover plate is provided with a liquid injection hole, the lower plastic part is arranged on one side of the cover plate, which faces the shell of the battery cell, and the liquid injection hole is communicated with the electrolyte buffer cavity.

10. A cell, comprising: a housing having a receiving cavity open on one side, a pole piece disposed within the receiving cavity, and a cap assembly of claim 9 capping the open side of the receiving cavity.