CN117458056A - Top cap subassembly and battery package - Google Patents

Top cap subassembly and battery package Download PDF

Info

Publication number
CN117458056A
CN117458056A CN202311455697.7A CN202311455697A CN117458056A CN 117458056 A CN117458056 A CN 117458056A CN 202311455697 A CN202311455697 A CN 202311455697A CN 117458056 A CN117458056 A CN 117458056A
Authority
CN
China
Prior art keywords
sealing
guide
elastic mechanism
sealing element
cap assembly
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311455697.7A
Other languages
Chinese (zh)
Inventor
吴雪银
李泽标
舒宽金
段栋
刘子文
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huizhou Eve Power Battery Co ltd
Hubei Eve Power Co Ltd
Original Assignee
Huizhou Eve Power Battery Co ltd
Hubei Eve Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huizhou Eve Power Battery Co ltd, Hubei Eve Power Co Ltd filed Critical Huizhou Eve Power Battery Co ltd
Priority to CN202311455697.7A priority Critical patent/CN117458056A/en
Publication of CN117458056A publication Critical patent/CN117458056A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/14—Primary casings, jackets or wrappings of a single cell or a single battery for protecting against damage caused by external factors
    • H01M50/145—Primary casings, jackets or wrappings of a single cell or a single battery for protecting against damage caused by external factors for protecting against corrosion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/183—Sealing members
    • H01M50/184—Sealing members characterised by their shape or structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings, jackets or wrappings of a single cell or a single battery
    • H01M50/183—Sealing members
    • H01M50/186—Sealing members characterised by the disposition of the sealing members
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • H01M50/636—Closing or sealing filling ports, e.g. using lids
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Filling, Topping-Up Batteries (AREA)

Abstract

The invention provides a top cover assembly and a battery pack, wherein the top cover assembly comprises a top cover assembly arranged on a battery cell, and the top cover assembly comprises a cover plate; the electrolyte injection hole is arranged on the cover plate and is used for supplementing electrolyte to the battery cell; a sealing element configured to be movable in a first direction relative to the cover plate between a first position and a second position; one end of the elastic mechanism is connected with the sealing element, and the elastic mechanism is used for driving the sealing element to move from the second position to the first position; the sealing sleeve is configured to be arranged around the elastic mechanism, and the elastic mechanism is configured to stretch and retract inside the sealing sleeve so as to prevent electrolyte from contacting the elastic mechanism.

Description

Top cap subassembly and battery package
Technical Field
The invention relates to the technical field of batteries, in particular to a top cover assembly and a battery pack.
Background
The battery package includes a plurality of electric cores, and the electric core includes casing, top cap subassembly, negative pole, anodal, diaphragm and electrolyte, is provided with the notes liquid hole on top cap subassembly, and the electrolyte is through the inside of annotating the liquid hole injection casing, accomplishes the notes liquid back, annotates the liquid hole and seals through sealing gasket and sealing colloidal particle, and the electrolyte in the electric core generally needs to be divided the electrolyte to annotate liquid or some battery packages configuration into the electrolyte several times and can be supplied, and removes sealing gasket and sealing colloidal particle that is used for sealing the notes liquid hole often the operation is complicated, especially sealing colloidal particle needs to be with the help of instrument and the operation degree of difficulty is high.
In view of the above, in the related art, by providing a movable sealing member, a stretchable elastic mechanism, in a cap assembly, wherein the sealing member is configured to open a liquid injection hole under the driving of a liquid injection device, and the sealing member is configured to seal the liquid injection hole under the driving of the elastic mechanism, the elastic mechanism is generally made of a metal material having elasticity, and in the process of injecting an electrolyte into the inside of a battery cell through the liquid injection hole, the electrolyte is easily contacted with the elastic mechanism to cause the electrolyte to be contaminated by the elastic mechanism, and at the same time the elastic mechanism is corroded due to the contact with the electrolyte, thereby damaging the elastic mechanism.
Disclosure of Invention
The embodiment of the invention provides a top cover assembly and a battery pack, which can improve the technical problem that an elastic mechanism is corroded by electrolyte.
In a first aspect, embodiments of the present invention provide a cap assembly disposed on a battery cell that is injected with an electrolyte therein using an electrolyte injection device, the cap assembly comprising:
a cover plate;
the electrolyte injection hole is arranged on the cover plate and is used for supplementing electrolyte to the battery cell;
a sealing element configured to be movable in a first direction relative to the cover plate between a first position and a second position, the sealing element being capable of sealing the pour hole when the sealing element is in the first position, the sealing element being staggered from the pour hole when the sealing element is in the second position;
one end of the elastic mechanism is connected with the sealing element, and the elastic mechanism is used for driving the sealing element to move from the second position to the first position;
the sealing sleeve is configured to be arranged around the elastic mechanism, and the elastic mechanism is configured to stretch and retract inside the sealing sleeve so as to prevent electrolyte from contacting the elastic mechanism.
In an embodiment, the sealing element comprises a body portion configured to move inside the sealing sleeve, an outer wall of the body portion being configured to be in sealing connection with an inner wall of the sealing sleeve.
In an embodiment, the sealing element comprises a body part and at least one guiding part connected to the body part, the guiding part being configured to be movable inside the sealing sleeve, the outer wall of the guiding part being configured to be in sealing connection with the inner wall of the sealing sleeve.
In one embodiment, the cap assembly further comprises a guide device provided with a first cavity, and the sealing sleeve is disposed inside the first cavity.
In one embodiment, the top cover assembly comprises an insulating base, the guiding device is combined on the insulating base, the insulating base is provided with a second cavity, and the guiding device is arranged inside the second cavity.
In an embodiment, the sealing element comprises a main body part and a plurality of guiding parts connected to the main body part, the guiding device comprises a plurality of cylindrical parts, one elastic mechanism and at least one sealing sleeve are arranged inside each cylindrical part, and each cylindrical part is provided with one guiding channel for moving one guiding part.
In an embodiment, the sealing sleeve is arranged coaxially with the guide.
In an embodiment, the sealing element further comprises a plurality of connection portions, through which the guide portion is connected with the main body portion;
the cylindrical portion includes an opening disposed on a sidewall of the cylindrical portion and extending in the first direction, the opening configured for movement of the connecting portion.
In an embodiment, the sealing sleeve comprises a main body part and an extension part, wherein the main body part is arranged in the cylindrical part, the extension part is arranged in the opening, and the connecting part is arranged at one end of the extension part.
In an embodiment, the sealing element comprises a first guide portion, a second guide portion and a third guide portion which are arranged at intervals, and the first guide portion, the second guide portion and the third guide portion are connected to the periphery of the main body portion at uniform intervals.
In one embodiment, the guiding device comprises a first cylindrical part, a second cylindrical part and a third cylindrical part which are arranged at intervals; the inside of first tube-shape portion is provided with first elastic mechanism and centers on first seal cover that first elastic mechanism set up, first guiding portion is in the inside of first seal cover removes, the inside of second tube-shape portion is provided with second elastic mechanism and centers on the second seal cover that second elastic mechanism set up, second guiding portion is in the inside of second seal cover removes, the inside of third tube-shape portion is provided with third elastic mechanism and centers on the third seal cover that third elastic mechanism set up, third guiding portion is in the inside of third seal cover removes.
In an embodiment, the insulating base includes a bottom wall defining a bottom forming the second cavity, the bottom wall including a first portion bottom wall and a second portion bottom wall, wherein the first portion bottom wall is provided with a plurality of liquid guiding holes thereon, and the first cylindrical portion, the second cylindrical portion, and the third cylindrical portion are disposed on the second portion bottom wall.
In a second aspect, embodiments of the present invention provide a battery pack including a plurality of cells including the cap assembly described above.
The embodiment of the invention has the beneficial effects that:
in the embodiment of the invention, the sealing sleeve is arranged in the top cover assembly and surrounds the elastic mechanism, and the elastic mechanism is configured to move in the sealing sleeve, so that electrolyte is prevented from entering the sealing sleeve to contact with the elastic mechanism, and the electrolyte can be prevented from corroding the elastic mechanism.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a perspective view of a top cap assembly provided in an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a cap assembly with a sealing member in a first position provided by an embodiment of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2;
FIG. 4 is a cross-sectional view of the cap assembly with the sealing member in a second position provided by an embodiment of the present invention;
FIG. 5 is an enlarged view of a portion of FIG. 4;
fig. 6 is a schematic structural view of a top cap assembly provided by an embodiment of the present invention;
FIG. 7 is an enlarged view of a portion of FIG. 6;
FIG. 8 is a perspective view of a sealing element provided by an embodiment of the present invention;
fig. 9 is a partial structural perspective view of a top cap assembly provided by an embodiment of the present invention;
FIG. 10 is an enlarged view of a portion of FIG. 9;
fig. 11 is a perspective view of a portion of the structure of a top cap assembly provided by an embodiment of the present invention;
FIG. 12 is an enlarged view of a portion of FIG. 11;
FIG. 13 is a cross-sectional view of a header assembly according to yet another embodiment of the present invention
FIG. 14 is an enlarged view of a portion of FIG. 13;
fig. 15 is a perspective view of a portion of the structure of a top cap assembly provided by an embodiment of the present invention;
FIG. 16 is an enlarged view of a portion of FIG. 15;
reference numerals:
100. a top cover assembly;
10. a cover plate; 101. an outer surface; 102. an inner surface; 11. a plastic part is arranged;
12. an insulating base; 121. a second chamber; 122. a sidewall; 123. a bottom wall; 1231. a first partial bottom wall; 1232. a second partial bottom wall; 124. a liquid guiding hole; 13. a liquid injection hole; 131. a first portion; 132. a second portion; 133. a step surface;
20. a sealing member; 21. a main body portion; 22. a boss portion; 221. a top end surface; 222. a side surface; 23. a guide part; 231. a first guide part; 232. a second guide part; 233. a third guide part; 24. a connection part; 241. a first connection portion; 242. a second connecting portion; 243. a third connecting portion;
30. an elastic mechanism; 31. a first elastic mechanism; 32. a second elastic mechanism; 33. a third elastic mechanism; 40. a guide device; 41. a first chamber; 42. a guide channel; 44. a cylindrical portion; 441. a first cylindrical portion; 442. a second cylindrical portion; 443. a third cylindrical portion; 45. an opening;
50. sealing sleeve; 51. a first gland; 52. a second gland; 53. a third gland; 501. a main body portion; 502. an extension portion;
200. a priming device;
60. an injection mechanism; 61. a pressing part; 62. a sleeve; 63. and (3) a piston.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention. Furthermore, it should be understood that the detailed description is presented herein for purposes of illustration and description only, and is not intended to limit the invention. In the present invention, unless otherwise indicated, terms of orientation such as "upper" and "lower" are used to generally refer to the upper and lower positions of the device in actual use or operation, and specifically the orientation of the drawing figures; while "inner" and "outer" are for the outline of the device.
An embodiment of the present invention provides a battery pack, where the battery pack includes one or more unit cells, and the unit cells may be connected in series, or the unit cells may be connected in parallel, or the unit cells may be connected in a hybrid manner, so that the battery pack has a capacity and power suitable for use by electric devices.
The battery pack also comprises a connecting sheet, wherein the connecting sheet is used for connecting the plurality of single battery cells, so that a stable serial-parallel connection structure is arranged between the positive electrodes and the negative electrodes of the plurality of single battery cells, and the material suitable for preparing the connecting sheet comprises copper foil.
The battery pack also comprises a box body, the box body is used for fixing and protecting a plurality of single battery cores and other parts, the box body can be formed by assembling a plurality of sub-box bodies, and materials suitable for preparing the box body have good anti-seismic, waterproof and insulating properties and suitable materials comprise metal or plastic materials.
The electric equipment applicable to the battery pack comprises a mobile phone, portable equipment, a notebook computer, an electric bicycle, an electric automobile, an electric ship, an electric toy, an electric tool and the like.
According to the safety performance requirements and the space requirements of the applicable electric equipment, the battery pack can further comprise a BMS (battery management system), wherein the BMS is used for monitoring, protecting and managing the working state of the battery pack, the BMS can monitor and balance the voltage and the temperature of each single battery cell, and meanwhile, the power and the protection function in the charging and discharging process of the battery pack can be controlled.
In alternative other examples, the battery pack may further include a protection board for monitoring and controlling the state and performance of the battery, which typically contains protection circuitry, such as overcharge protection, discharge protection, short-circuit protection, and the like.
The embodiment of the invention also provides a battery cell for the battery pack, which comprises a shell, a positive pole piece, a negative pole piece, a separation membrane and electrolyte.
The positive electrode plate and the negative electrode plate are main chemical reaction parts of the battery core, the electrochemical active substance of the positive electrode plate usually contains a compound containing lithium elements, and the negative electrode plate usually contains a carbon material or a metal material.
The separation membrane is an isolation layer positioned between the positive pole piece and the negative pole piece in the battery cell, so that the positive pole piece and the negative pole piece are not in direct contact, short circuit is prevented, and the separation membrane is generally configured as a specially formed polymer film.
The electrolyte is typically an ion-conducting solution that provides positive and negative ion movement to facilitate chemical reactions in the cell.
The positive pole piece, the negative pole piece, the separation membrane and the electrolyte together form a winding core component of the battery core.
According to different electrolytes, the battery cell comprises a lithium ion battery, a lithium sulfur battery, a nano lithium ion battery, a sodium ion battery or a magnesium ion battery and the like. The battery cell includes, but is not limited to, a lithium ion secondary battery, a lithium ion primary battery, depending on whether the electrolyte in the battery cell is replenishable.
The housing is typically formed of a housing and a cap assembly, wherein the housing is made of a metallic material having certain mechanical strength and corrosion resistance, suitable metallic materials including nickel or steel, and the housing is used to secure and protect the anode and cathode of the inside of the cell, the separator, and the electrolyte from external physical damage. The housing may be wound in a cylindrical shape or the housing may be configured in a square shape.
The top cap subassembly sets up in the open end in top of casing, and top cap subassembly is used for sealed open end of electric core and provides the contact point of the anodal of electric core or the contact point of the anodal and the negative pole of electric core.
In an embodiment of the present invention, a structure of a top cap assembly suitable for the above-mentioned battery cells is provided, and a square battery cell is taken as an example for explanation, referring to fig. 1 for illustrating a perspective view of the top cap assembly 100, fig. 2 to 5 for illustrating a cross-sectional view of the top cap assembly 100, and the top cap assembly 100 includes an upper plastic member 11, a cover plate 10 and an insulating base 12 sequentially stacked from top to bottom.
The cover plate 10 is a main support of the top cover assembly 100, and the cover plate 10 is used to cover the top opening of the housing and to carry other components. The cover plate 10 is made of a metal material having good electrical conductivity and mechanical strength, and the metal material suitable for manufacturing the cover plate 10 includes nickel, copper alloy, and the like.
The cover plate 10 comprises an outer surface 101 and an inner surface 102 which are oppositely arranged, the upper plastic part 11 is fixed on the outer surface 101 of the cover plate 10, and the insulating base 12 is fixed on the inner surface 102 of the cover plate 10.
The cover plate 10 is further provided with a liquid injection hole 13, the liquid injection hole 13 is used for supplying electrolyte to the inside of the battery cell by the liquid injection device, and the liquid injection hole 13 is positioned at one side of the upper plastic part 11.
Referring further to fig. 2 to 6, the cap assembly 100 further includes a sealing member 20 and an elastic mechanism 30, the sealing member 20 is used for sealing a portion of the electrolyte injection hole 13, one end of the elastic mechanism 30 is connected to the sealing member 20, wherein the sealing member 20 is configured to be movable in a first direction between a first position and a second position with respect to the cap plate 10, when the sealing member 20 is in the first position, the sealing member 20 is capable of sealing the electrolyte injection hole 13, the battery cell is in a closed state, and the electrolyte injection device cannot supplement electrolyte to the inside of the battery cell through the electrolyte injection hole 13, as shown in fig. 2 and 3. When the sealing element 20 is in the second position, the sealing element 20 is staggered from the injection hole 13, and the electrolyte injection device can supplement electrolyte to the inside of the battery cell through the injection hole 13, as shown in fig. 4 and 5.
Wherein the driving force of the sealing element 20 moving from the first position to the second position is derived from the driving force provided by the electrolyte injection device 200 to the sealing element 20, when the electrolyte injection is completed, the electrolyte injection device 200 is removed, and the elastic mechanism 30 has an elastic driving force due to being compressed, and the elastic driving force can drive the sealing element 20 to move from the second position to the first position.
Further, the sealing member 20 includes a main body portion 21 and a boss portion 22 provided to protrude with respect to the main body portion 21, and the cap plate 10 includes an outer surface 101 and an inner surface 102 provided to face each other, wherein the main body portion 21 abuts against a part of the inner surface 102, and the boss portion 22 is inserted into the inside of the pouring spout 13, so that the sealing member 20 forms a stable sealing action against the pouring spout 13.
The boss 22 is located at the center of the main body 21, and the boss 22 includes a top surface 221 and a side surface 222, wherein the top surface 221 is configured as a flat surface, and after the injection mechanism 60 is inserted into the injection hole 13, the pressing portion 61 of the injection mechanism 60 abuts against the top surface 221, and the top surface 221 is disposed on the end surface of the platform, so that a smooth contact surface is formed between the injection mechanism 60 and the sealing element 20, and the injection mechanism 60 presses the sealing element 20. The side surface 222 is configured as a circular arc transition surface, so that the boss portion 22 is facilitated to be inserted into the liquid injection hole 13.
As further shown in fig. 3 and 5, the injection hole 13 is configured as a stepped hole, and in particular, the injection hole 13 includes a first portion 131 and a second portion 132 connected to each other, wherein the first portion 131 has an inner diameter larger than that of the second portion 152, a stepped surface 133 is formed between the first portion 131 and the second portion 132, the boss portion 22 of the sealing member 20 is inserted into the second portion 132, wherein the first portion 131 communicates with the outside of the battery cell, the second portion 132 communicates with the inside of the battery cell, and the boss portion 22 is used for sealing the open end of the second portion 132.
With further reference to fig. 2 and 3, the cap assembly 100 of the cell into which the electrolyte is to be injected is in the state shown in fig. 2 and 3, the boss portion 22 of the sealing member is inserted into the second portion 132 of the injection hole, the injection mechanism 60 of the injection device 200 is inserted into the injection hole 13, the injection mechanism 60 is pressed until the pressing portion 61 of the injection mechanism 60 contacts the boss portion 22 of the sealing member, the injection mechanism 60 is continuously pressed, and the sealing member 20 moves downward in the height direction of the cell and is completely staggered from the injection hole 13.
With continued reference to fig. 4 and 5, when the sealing element 20 is moved to the second position, the elastic mechanism 30 is in a compressed state, the sleeve 62 of the injection mechanism abuts against the stepped surface 133 inside the injection hole 13, and a portion of the piston 63 of the injection mechanism passes through the injection hole 13 into the interior of the cell, and electrolyte enters the interior of the cell along the outer wall of the piston.
When the sealing element 20 is at the second position, the elastic mechanism 30 is in a compressed state, after the injection is completed, the injection mechanism 60 removes the injection hole 13, the elastic mechanism 30 applies an upward force to the sealing element 20, and the sealing element 20 moves from the second position toward a direction approaching the first position.
In the process of injecting the electrolyte into the battery cell, the electrolyte is in contact with the sealing element 20 and the elastic mechanism 30, wherein the sealing element 20 is made of a corrosion-resistant rubber material, the elastic mechanism 30 is an elastic member made of a metal material, the elastic member comprises a spring, the electrolyte usually contains a strong acid substance or a strong alkaline substance, so that chemical reaction is easy to occur between the electrolyte and the elastic mechanism 30 made of the metal material, on one hand, the electrolyte is easy to be polluted, and on the other hand, the elastic mechanism 30 is easy to be corroded by the electrolyte, so that the elastic mechanism 30 is damaged.
Referring further to fig. 6 to 16, in an embodiment of the present invention, the top cap assembly 100 further includes a sealing sleeve 50, the sealing sleeve 50 is configured to be disposed around the elastic means 30, and the elastic means 30 is configured to extend and retract inside the sealing sleeve 50, so that the elastic means 30 is provided with a structure covering the sealing sleeve 50, and thus the electrolyte is difficult to contact with the elastic means 30, thereby effectively preventing the elastic means 30 from being corroded by the electrolyte.
In one example provided in this application, the sealing sleeve 50 is made of a corrosion-resistant rubber material and has a sleeve-shaped structure, the elastic mechanism 30 is disposed inside the sealing sleeve 50, the sealing element 20 is configured to be received inside the sealing sleeve 50, and the sealing element 20 is configured to be movable inside the sealing sleeve 50, and during the movement of the sealing element 20, the outer wall of the sealing element 20 is always in sealing connection with the inner wall of the sealing sleeve 50, so that during the movement of the sealing element 20, even if a part of electrolyte enters the sealing sleeve 50 through the open end of the sealing sleeve 50, the sealing element 20 can block a part of electrolyte entering the sealing sleeve 50 from contacting the elastic mechanism 30.
Specifically, during the downward movement of the sealing element 20, the elastic means 30 is compressed, and the sealing element 20 is in sealing connection with the sealing sleeve 50, and the sealing element 20 shields the elastic means 30, thereby preventing the electrolyte from contacting the elastic means 30.
In the process that the sealing element 20 is driven by the elasticity of the elastic mechanism 30 to move upwards, the sealing element 20 shields the elastic mechanism 30 and simultaneously guides part of electrolyte out of the sealing sleeve 50, so that the electrolyte is effectively prevented from contacting the elastic mechanism 30.
The elastic mechanism 30 is connected to one end of the sealing element 20, the other end of the sealing element 20 is in a free state, and the acting force applied to the sealing element 20 by the elastic mechanism 30 may be inclined in the free rebound process of the elastic mechanism 30, so that the sealing element 20 cannot accurately seal the liquid injection hole 13, and the top cover assembly 100 cannot seal.
Also provided within the cap assembly 100 is a guide 40, the guide 40 being provided with a hollow first cavity 41, the first cavity 41 defining a guide channel 42, the sealing member 20 including a guide portion 23, the guide portion 23 being configured to move within the guide channel 42, wherein the guide channel 42 extends along a first direction, such that the guide portion 23 of the sealing member is guided to move along the first direction to move the sealing member 20 along the first direction from the second position to the first position, thereby enabling a precise sealing of the pour hole.
In the above embodiment, the sealing member 20 is moved substantially in the height direction of the battery cell, and since the guide channel 42 extends in the same direction as the moving path of the sealing member 20, the guide channel 42 is disposed in the same direction as the height direction of the battery cell.
With further reference to fig. 9-16, the elastic mechanism 30 and the sealing sleeve 50 are both disposed inside the first cavity 41, the elastic mechanism 30 being configured to move along the axial direction of the guide 40. Wherein the guide means 40 is made of a hard plastic material or a rubber material, and the sealing sleeve 50 is made of a flexible fiber cotton material, wherein the sealing sleeve 50 can be made of a polymer fiber cotton material to form a complete body, or the sealing sleeve 50 is made of a fiber cotton material to form a sheet body, the sheet body is wound inside the first cavity 41, and a sealing effect is formed between the outer surface of the sealing sleeve 50 and the inner surface of the first cavity 41, so that electrolyte is prevented from entering the inside of the first cavity 41.
The sealing element 20 is received in the interior of the first cavity 41 and the sealing sleeve 50 is arranged coaxially with the sealing element 20, the sealing sleeve 50 being located at the outer periphery of the sealing element 20, the outer side wall of the sealing element 20 being in sealing connection with the inner surface of the sealing sleeve 50.
Further, the coefficient of friction between the sealing element 20 and the sealing sleeve 50 is the same as the coefficient of friction between the sealing sleeve 50 and the guiding means 40, so that the sealing sleeve 50 remains fixed inside the first cavity 41 during the movement of the sealing element 20 inside the sealing sleeve 50.
Further, the guiding device 40 includes a plurality of cylindrical portions 44, the sealing element 20 includes a plurality of guiding portions 23, the plurality of guiding portions 23 are connected to the outer periphery of the main body 21, an elastic mechanism 30 is disposed inside each cylindrical portion 44, a sealing sleeve 50 is further disposed inside each cylindrical portion 44, an outer surface of the sealing sleeve 50 is in sealing connection with an inner surface of the cylindrical portion 44, one guiding portion 23 can be accommodated inside each cylindrical portion 44, and the guiding portion 23 is disposed inside the sealing sleeve 50.
Wherein the guide portion 23, the sealing sleeve 50 and the cylindrical portion 44 are coaxially arranged, and the sealing sleeve 50 and the cylindrical portion 44 extend along the first direction, and the sealing sleeve 50 and the cylindrical portion 44 have the same extending height.
Referring further to fig. 9 to 16, the guide device 40 includes a first cylindrical portion 441, a second cylindrical portion 442, and a third cylindrical portion 443, the first elastic mechanism 31 is provided inside the first cylindrical portion 441, the first sealing sleeve 51 is further provided inside the first cylindrical portion 441, the first sealing sleeve 51 is configured to be provided around the first elastic mechanism 31, the first elastic mechanism 31 is configured to move in the inner cavity of the first sealing sleeve 51, the second elastic mechanism 32 is provided inside the second cylindrical portion 442, the second sealing sleeve 52 is further provided inside the second cylindrical portion 442, the second sealing sleeve 52 is configured to be provided around the second elastic mechanism 32, the second elastic mechanism 32 is configured to move in the inner cavity of the second sealing sleeve 52, the third elastic mechanism 33 is provided inside the third cylindrical portion 443, the third sealing sleeve 53 is configured to be provided around the third elastic mechanism 33, and the third elastic mechanism 33 is configured to move in the inner cavity of the third sealing sleeve 53.
Referring to fig. 8, the sealing member 20 includes a first guide portion 231, a second guide portion 232, and a third guide portion 233, wherein the first guide portion 231, the second guide portion 232, and the third guide portion 233 remain uniformly spaced apart from the outer circumference of the main body portion 21.
The first elastic mechanism 31 is connected to the first guide 231, the first guide 231 is configured to move inside the first tubular portion 441, the second elastic mechanism 32 is connected to the second guide 232, the second guide 232 is configured to move inside the second tubular portion 442, the third elastic mechanism 33 is connected to the third guide 233, and the third guide 233 is configured to move inside the third tubular portion 443.
The first elastic mechanism 31, the second elastic mechanism 32 and the third elastic mechanism 33 simultaneously provide elastic support and elastic driving force for the first guide portion 231, the second guide portion 232 and the third guide portion 233 of the sealing element, so that the sealing element 20 can be stably maintained in the top cover assembly 100, and meanwhile, in the moving process of the sealing element 20, the moving direction and the moving position of the sealing element 20 are guided by the three cylindrical portions 44, so that the moving direction and the moving position of the sealing element 20 are more stable and accurate, and the sealing of the liquid injection hole 13 of the sealing element 20 is facilitated.
Further, the sealing element 20 further includes a connecting portion 24 for connecting the guide portion 23 and the main body portion 21, specifically, when three guide portions 23 are provided on the sealing element 20, the sealing element 20 includes a first connecting portion 241, a second connecting portion 242, and a third connecting portion 243, wherein the first connecting portion 241 is used for connecting the first guide portion 231 and the main body portion 21, the second connecting portion 242 is used for connecting the second guide portion 232 and the main body portion 21, and the third connecting portion 243 is used for connecting the third guide portion 233 and the main body portion 21.
Wherein the cross sections of the main body 21 and the three guide portions 23 are all circular, and the outer diameter of the guide portion 23 is smaller than the outer diameter of the main body 21.
Further referring to fig. 16, an opening 45 is further provided in a side wall of each of the cylindrical portions 44, the opening 45 extending in the first direction and being provided through the side wall of the cylindrical portion 44, and when the sealing member 20 is moving, the guide portion 23 moves inside the cylindrical portion 44, the main body portion 21 moves outside the cylindrical portion 44, and the connection portion 24 moves along the opening 45.
The sealing sleeve 50 comprises a main body part 501 and an extension part 502, wherein the main body part 501 is arranged in the interior of the cylindrical part 44, the extension part 502 is arranged in the opening 45, the connecting part 24 of the sealing element is abutted against the top end of the extension part 502, the main body part 501 of the sealing sleeve 50 can be fixed in the interior of the cylindrical part 44 during the movement of the sealing element 20, the main body part 501 of the sealing sleeve 50 can also move along with the sealing element 20, and the extension part 502 is pressed by the connecting part 24 to move along with the sealing element 20.
The extension 502 serves to seal the opening 45, thereby preventing electrolyte from entering the interior of the sealing sleeve 50 through the opening 45.
The sealing element 20 is provided with a first guide 231, a second guide 232 and a third guide 233, wherein an angle between the first guide 231 and the second guide 232 is set to 120 degrees, an angle between the second guide 232 and the third guide 233 is set to 120 degrees, and an angle between the third guide 233 and the first guide 231 is set to 120 degrees.
In other alternative examples, a plurality of guides 23 may be provided on the sealing member 20, and the number of guides 23 may be 2, 4, 6 or more, to facilitate smoother movement of the sealing member 20 under the guidance of the plurality of guides 23. Correspondingly, the number of the cylindrical portions 44 provided in the guide 40 remains the same as the number of the guide portions 23 described above.
Further, the insulating holder 12 is provided with a second cavity 121, the second cavity 121 being arranged convexly with respect to the main body portion of the insulating holder 12, the insulating holder 12 comprising a side wall 122 and a bottom wall 123 defining the second cavity 121, the guiding means 40 being arranged inside the second cavity 121.
The bottom wall 123 includes a first portion bottom wall 1231 and a second portion bottom wall 1232, wherein the first portion bottom wall 1231 is provided with a plurality of liquid guiding holes 124, the guiding device 40 is disposed on the second portion bottom wall 1232, and when the guiding device 40 includes a plurality of cylindrical portions 44, the plurality of cylindrical portions 44 are disposed above the second portion bottom wall 1232 at intervals, and no liquid guiding holes 124 are disposed on a portion of the bottom wall between the plurality of cylindrical portions 44.
Electrolyte enters the second cavity 121 through the liquid injection hole 13 and enters the interior of the battery cell through the plurality of liquid guide holes 124, the bottom wall 1232 of the second part is opposite to the sealing element 20, the sealing element 20 is opposite to the liquid injection hole 13, and after the electrolyte enters the second cavity 121 through the liquid injection hole 13, the plurality of liquid guide holes 124 are used for guiding the electrolyte to disperse and flow out, so that the electrolyte is prevented from directly flowing out through the liquid injection hole 13, and strong fluid impact force is formed to damage a winding core assembly in the battery cell.
The foregoing has outlined rather broadly the more detailed description of embodiments of the invention, wherein the principles and embodiments of the invention are explained in detail using specific examples, the above examples being provided solely to facilitate the understanding of the method and core concepts of the invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present invention, the present description should not be construed as limiting the present invention.

Claims (13)

1. A cap assembly disposed on a cell, the cap assembly comprising:
a cover plate;
the electrolyte injection hole is arranged on the cover plate and is used for supplementing electrolyte to the battery cell;
a sealing element configured to be movable in a first direction relative to the cover plate between a first position and a second position, the sealing element being capable of sealing the pour hole when the sealing element is in the first position, the sealing element being staggered from the pour hole when the sealing element is in the second position;
one end of the elastic mechanism is connected with the sealing element, and the elastic mechanism is used for driving the sealing element to move from the second position to the first position;
the sealing sleeve is configured to be arranged around the elastic mechanism, and the elastic mechanism is configured to stretch and retract inside the sealing sleeve so as to prevent electrolyte from contacting the elastic mechanism.
2. The cap assembly of claim 1, wherein the sealing member comprises a body portion configured to move within the interior of the sealing sleeve, an outer wall of the body portion configured to sealingly couple with an inner wall of the sealing sleeve.
3. The cap assembly of claim 1, wherein the sealing element comprises a body portion and at least one guide portion coupled to the body portion, the guide portion configured to be movable within the interior of the sealing sleeve, an outer wall of the guide portion configured to be sealingly coupled with an inner wall of the sealing sleeve.
4. The cap assembly of claim 1, further comprising a guide device, the guide device being provided with a first cavity, the sealing sleeve being disposed inside the first cavity.
5. The header assembly of claim 4, wherein the header assembly includes an insulator seat, the guide is coupled to the insulator seat, the insulator seat is provided with a second cavity, and the guide is disposed inside the second cavity.
6. The cap assembly of claim 5, wherein the sealing member comprises a main body portion and a plurality of guide portions connected to the main body portion, the guide means comprising a plurality of cylindrical portions, each of the cylindrical portions being internally provided with one of the elastic mechanisms and at least one of the sealing sleeves, each of the cylindrical portions being provided with one of the guide channels for movement of one of the guide portions.
7. The cap assembly of claim 6, wherein the sealing sleeve is disposed coaxially with the guide.
8. The cap assembly of claim 6, wherein the sealing member further comprises a plurality of connection portions, the guide portion being connected to the body portion by the connection portions;
the cylindrical portion includes an opening disposed on a sidewall of the cylindrical portion and extending in the first direction, the opening configured for movement of the connecting portion.
9. The cap assembly of claim 8, wherein the sealing sleeve comprises a body portion disposed inside the barrel portion and an extension portion disposed within the opening, the connection portion being disposed at one end of the extension portion.
10. The cap assembly of claim 9, wherein the sealing member includes first, second and third guide portions disposed at intervals, the first, second and third guide portions being maintained at uniform intervals connected to the outer circumference of the body portion.
11. The header assembly of claim 10, wherein the guide means comprises first, second and third cylindrical portions disposed in spaced apart relation;
the inside of first tube-shape portion is provided with first elastic mechanism and centers on first seal cover that first elastic mechanism set up, first guiding portion is in the inside of first seal cover removes, the inside of second tube-shape portion is provided with second elastic mechanism and centers on the second seal cover that second elastic mechanism set up, second guiding portion is in the inside of second seal cover removes, the inside of third tube-shape portion is provided with third elastic mechanism and centers on the third seal cover that third elastic mechanism set up, third guiding portion is in the inside of third seal cover removes.
12. The header assembly of claim 11, wherein the insulating base includes a bottom wall defining a bottom portion forming the second cavity, the bottom wall including a first portion bottom wall and a second portion bottom wall, wherein the first portion bottom wall has a plurality of liquid-guiding apertures disposed thereon, and the first, second, and third cylindrical portions are disposed on the second portion bottom wall.
13. A battery pack comprising a plurality of cells, the cells comprising the cap assembly of any one of claims 1-12.
CN202311455697.7A 2023-11-02 2023-11-02 Top cap subassembly and battery package Pending CN117458056A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311455697.7A CN117458056A (en) 2023-11-02 2023-11-02 Top cap subassembly and battery package

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311455697.7A CN117458056A (en) 2023-11-02 2023-11-02 Top cap subassembly and battery package

Publications (1)

Publication Number Publication Date
CN117458056A true CN117458056A (en) 2024-01-26

Family

ID=89585071

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311455697.7A Pending CN117458056A (en) 2023-11-02 2023-11-02 Top cap subassembly and battery package

Country Status (1)

Country Link
CN (1) CN117458056A (en)

Similar Documents

Publication Publication Date Title
KR100686841B1 (en) Li Secondary Battery
US7691530B2 (en) Cylindrical lithium secondary battery
KR100696821B1 (en) Li Secondary Battery and Method of fabricating the same
CN214477678U (en) Cover plate, battery monomer, battery and electric equipment
US8852795B2 (en) Secondary battery
KR100749645B1 (en) Separator and lithium rechargeable battery using the same
WO2023025107A1 (en) Battery cell, battery, and electric device
KR20120062232A (en) Secondary battery with means for supplying electrolyte
KR20060111838A (en) Cylindrical li secondary battery and method of fabricating the same
KR20130118232A (en) Rechargeable battery
KR100635730B1 (en) Cylindrical li secondary battery and method for fabricating the same
WO2019117339A1 (en) Cylindrical lithium ion secondary battery
KR20000014671A (en) Cap assembly of secondary battery
KR20130065574A (en) Secondary battery
JP2023531129A (en) End Cap Assemblies, Single Cells, Batteries and Powered Devices
CN218586157U (en) Battery cell, battery and power consumption device
CN218182424U (en) Battery cell, battery and power consumption device
KR20150115558A (en) Rechargeable battery having protection circuit module
CN117458056A (en) Top cap subassembly and battery package
KR20060111841A (en) Cylindrical li secondary battery and method of fabricating the same
KR20080018471A (en) Rechageable battery
KR100760786B1 (en) Secondary battery and the same using method
KR102335696B1 (en) The Current Interrupt Device And The Cap Assembly
KR100614394B1 (en) Secondary Battery with Means for Supplying Electrolyte
CN117458058A (en) Top cover assembly, battery cell liquid injection method and battery pack

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination