CN115312929B - Top cover assembly, battery and preparation method of battery - Google Patents
Top cover assembly, battery and preparation method of battery Download PDFInfo
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- CN115312929B CN115312929B CN202211245030.XA CN202211245030A CN115312929B CN 115312929 B CN115312929 B CN 115312929B CN 202211245030 A CN202211245030 A CN 202211245030A CN 115312929 B CN115312929 B CN 115312929B
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- top cover
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- battery
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- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 33
- 230000002427 irreversible effect Effects 0.000 claims abstract description 13
- 238000007789 sealing Methods 0.000 claims description 45
- 239000007788 liquid Substances 0.000 claims description 38
- 238000002347 injection Methods 0.000 claims description 34
- 239000007924 injection Substances 0.000 claims description 34
- 230000002093 peripheral effect Effects 0.000 claims description 13
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 10
- 239000003792 electrolyte Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 239000004020 conductor Substances 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000003825 pressing Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 9
- 230000032683 aging Effects 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 11
- 238000004804 winding Methods 0.000 description 11
- 230000000903 blocking effect Effects 0.000 description 6
- 238000009434 installation Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 206010057071 Rectal tenesmus Diseases 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 208000012271 tenesmus Diseases 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910001000 nickel titanium Inorganic materials 0.000 description 1
- HLXZNVUGXRDIFK-UHFFFAOYSA-N nickel titanium Chemical compound [Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ti].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni].[Ni] HLXZNVUGXRDIFK-UHFFFAOYSA-N 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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Classifications
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- 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
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/152—Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/04—Construction or manufacture in general
- H01M10/0404—Machines for assembling batteries
-
- 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
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/154—Lid or cover comprising an axial bore for receiving a central current collector
-
- 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
- H01M50/183—Sealing members
- H01M50/186—Sealing members characterised by the disposition of the sealing members
- H01M50/188—Sealing members characterised by the disposition of the sealing members the sealing members being arranged between the lid and terminal
-
- 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/547—Terminals characterised by the disposition of the terminals on the 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
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/543—Terminals
- H01M50/562—Terminals characterised by the material
-
- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The application provides a top cap subassembly, battery and preparation method of battery, and the top cap subassembly includes top cap, utmost point post and mounting, and the top cap is equipped with the mounting hole, and the mounting hole runs through the top cap along the thickness direction of top cap, and utmost point post installs in the mounting hole, and the mounting is installed in the top cap, and encircles utmost point post setting, and the material of mounting is irreversible thermal expansion material, and the mounting is in the expanded state, just supports and holds in the week side of utmost point post. This application uses irreversible thermal expansion material preparation mounting for the mounting is in the expanded state and supports and hold in the week side of utmost point post, in order to realize centre gripping utmost point post and promote the firmness of assembling between top cap and the utmost point post, has avoided breaking away from because of the ageing utmost point post and top cap that leads to of top cap, thereby leads to the problem that sealed effect reduces between top cap and the utmost point post.
Description
Technical Field
The application relates to the technical field of batteries, in particular to a top cover assembly, a battery and a preparation method of the battery.
Background
Currently, more and more electric vehicles and vehicles use batteries as energy sources. In the battery structure, the post is usually mounted on the top cover of the battery case, and the top cover is aged after long-term use, so that the post is easily separated from the top cover, thereby causing poor sealing performance between the post and the top cover.
Disclosure of Invention
The application aims to provide a top cover assembly, a battery and a battery preparation method, and the fixing piece in the top cover assembly can be used for improving the assembly firmness between a pole and a top cover, so that the sealing property between the pole and the top cover is improved.
The application provides a top cap subassembly, including top cap, utmost point post and mounting, the top cap is equipped with the mounting hole, and the mounting hole runs through the top cap along the thickness direction of top cap, and utmost point post is installed in the mounting hole, and the mounting is installed in the top cap, and encircles utmost point post setting, and the material of mounting is irreversible thermal expansion material, and the mounting is in the inflation state, and supports and hold in the week side of utmost point post.
The top cover is provided with a groove, an opening of the groove is formed in the top surface of the top cover, the groove is arranged around the mounting hole and communicated with the mounting hole, and the fixing piece is mounted in the groove and abuts against the groove side wall of the groove.
Wherein, the material of the fixed part is thermal expansion one-way memory alloy.
Wherein, utmost point post is equipped with annotates the liquid hole, annotates the liquid hole and runs through utmost point post along the thickness direction of utmost point post, and the mounting is equipped with the through-hole, and the through-hole runs through the mounting along the thickness direction of mounting, and with annotate liquid hole intercommunication, and the top cap subassembly still includes sealed nail, and sealed nail is worn to locate the through-hole to sealed annotate the liquid hole.
Wherein, at least part of the sealing nail is positioned in the liquid injection hole and seals the liquid injection hole.
Wherein, the seal nail includes fixed part and sealing part, and fixed part installs in the through-hole, and the sealing part is connected with fixed part, and sealed notes liquid hole.
Wherein, the material of seal nail is the conducting material.
Wherein, the material of the sealing nail is thermal expansion one-way memory alloy.
Wherein, utmost point post is equipped with annotates the liquid hole, annotates the liquid hole and runs through utmost point post along the thickness direction of utmost point post, and the sealed liquid hole of annotating of mounting.
The fixing piece comprises a clamping part and a blocking part, the clamping part surrounds the pole and abuts against the peripheral side face of the pole, and the blocking part is fixed on the clamping part and seals the liquid injection hole.
Wherein, the plugging part protrudes relative to the clamping part, at least part of the plugging part is positioned in the liquid injection hole, and the liquid injection hole is sealed.
This application still provides a battery, including casing, electric core and the top cap subassembly as above, the casing is equipped with the holding chamber, and the opening in holding chamber is located the top of casing, and electric core and top cap subassembly are all installed in the holding chamber, and top cap subassembly is located electric core towards the open-ended one side in holding chamber.
The shell comprises a concave part, and the concave part is concave towards the top cover and is abutted against the peripheral side surface of the top cover.
The application also provides a preparation method of the battery, which comprises the following steps:
the method comprises the following steps that S1, a pole is mounted in a mounting hole of a top cover, the mounting hole penetrates through the top cover along the thickness direction of the top cover, the pole is provided with a liquid injection hole, the liquid injection hole penetrates through the pole along the thickness direction of the pole, and the pole is electrically connected with a battery cell;
s2, mounting the battery cell and the top cover in an accommodating cavity of the shell;
s3, injecting electrolyte through the liquid injection hole;
s4, mounting a fixing piece on the top cover and arranging the fixing piece around the pole, wherein the fixing piece is provided with a through hole which penetrates through the fixing piece along the thickness direction of the fixing piece and is communicated with the liquid injection hole, and the fixing piece is made of an irreversible thermal expansion material;
s5, penetrating the sealing nail into the through hole and sealing the liquid injection hole;
s6, heating the fixing piece to a preset temperature to enable the fixing piece to be in an expansion state;
wherein, the step S3 and the step S4 can exchange the sequence.
And S7, extruding the shell to form a concave part, and butting against the peripheral side surface of the top cover to realize sealing, wherein the step S6 and the step S7 can be exchanged.
The application provides a top cap subassembly uses irreversible thermal expansion material preparation mounting for the mounting is in the expanded state and supports and holds in the week side of utmost point post, in order to realize centre gripping utmost point post and promote the firmness of assembling between top cap and the utmost point post, has avoided leading to utmost point post and top cap to break away from because of the top cap is ageing, thereby lead to sealed effect between top cap and the utmost point post to reduce and lead to the utmost point post that drops to exert pressure and arouse the cracked problem of negative pole ear to the negative pole ear of electric core.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a battery according to a first embodiment of the present application;
FIG. 2 is a schematic view of the structure of the case in the battery shown in FIG. 1;
FIG. 3 is a schematic top view of the bottom housing of the housing shown in FIG. 2;
FIG. 4 is a schematic view of the position of the first portion in the bottom case in some other embodiments;
FIG. 5 is a partial structural view of portion A of the battery shown in FIG. 1;
FIG. 6 is a schematic structural view of a top cover of the partial structure shown in FIG. 5;
fig. 7 is a schematic structural diagram of a battery according to a second embodiment of the present application;
FIG. 8 is an enlarged view of the structure of the fixing member in the battery shown in FIG. 7;
fig. 9 is a schematic structural diagram of a battery according to a third embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a battery 1000 according to a first embodiment of the present application.
For convenience of description, the length direction of the battery 1000 shown in fig. 1 is defined as the X-axis direction, the width direction is defined as the Y-axis direction, and the height direction is defined as the Z-axis direction. The terms "top" and "bottom" used in the description of the battery 1000 in the embodiments of the present application are described with reference to the orientation shown in fig. 1, and are used to indicate "top" in the positive direction toward the Z axis and "bottom" in the negative direction toward the Z axis, which does not form a limitation on the practical application of the battery 1000.
The battery 1000 includes a case 100, a battery cell 200, and a cap assembly 300. The housing 100 is provided with a receiving cavity 101, and an opening of the receiving cavity 101 is located at a top end of the housing 100. The battery core 200 and the cap assembly 300 are both installed in the accommodating cavity 101, and the cap assembly 300 is located on one side of the battery core 200 facing the opening of the accommodating cavity 101.
Referring to fig. 2, 3 and 4, fig. 2 is a schematic structural diagram of the housing 100 in the battery 1000 shown in fig. 1, and fig. 3 is a schematic structural diagram of the bottom case 120 in the housing 100 shown in fig. 2. Fig. 4 is a schematic diagram of a position of the first portion 121 in the bottom case 120 in some other embodiments, where (a) in fig. 4 shows one schematic diagram of the first portion 121 in the bottom case 120, and (b) in fig. 4 shows another schematic diagram of the first portion 121 in the bottom case 120.
The case 100 includes a side case 110 and a bottom case 120. The side case 110 surrounds the periphery of the bottom case 120. The side shell 110 and the bottom shell 120 enclose a receiving cavity 101. Side shell 110 includes a recess 111 and a flange 112. The concave portion 111 is disposed on a portion of the side shell 110 near the opening of the accommodating chamber 101 and is concave toward the accommodating chamber 101. The flange 112 is disposed at an end of the side shell 110 away from the bottom shell 120 and is folded toward the accommodating cavity 101. In this embodiment, side shell 110 is an aluminum shell. In other embodiments, side shell 110 may be made of other materials, and the present application is not limited thereto.
The bottom case 120 is provided with a first portion 121 and a second portion 122, and the second portion 122 is adjacent to the first portion 121. The thickness at first portion 121 is less than the thickness at second portion 122 so that first portion 121 becomes a force-receiving weakened area of bottom case 120, and is more easily broken under pressure. Specifically, the first portion 121 may be formed by performing a thinning process on the bottom chassis 120. The first part 121 of the bottom case 120 is arranged on the bottom case 120, so that the first part 121 of the bottom case 120 is easily broken under pressure when the pressure inside the battery 1000 rises to a certain value, and an explosion-proof effect is achieved.
As shown in fig. 3, in the present embodiment, the first portion 121 is an annular region, and the first portion 121 is disposed around the central axis of the bottom case 120, so that the bottom case 120 is easier to explode under a pressure condition, and the explosion-proof effect is better. It is understood that, in other embodiments, first portion 121 may not be disposed around the central axis of bottom case 120, as shown in fig. 4, first portion 121 does not surround the central axis of bottom case 120 for one circle, when first portion 121 bursts under pressure, second portion 122 remains, and bottom case 120 is not easily popped out due to bursting of first portion 121.
In this embodiment, the bottom case 120 is made of a heat-sensitive material. In the present embodiment, the "thermosensitive material" refers to a material that expands or contracts when a certain temperature is increased. Illustratively, the heat sensitive material is a memory alloy, such as nitinol. The bottom case 120 made of the thermosensitive material can be sensitive to temperature, and when the internal temperature of the battery 1000 reaches a certain value, the bottom case 120 made of the thermosensitive material can be deformed and broken, thereby achieving an explosion-proof effect. The present embodiment provides a double explosion-proof effect by providing the first portion 121 on the bottom case 120 and providing the material of the bottom case 120 as a heat-sensitive material, so that the bottom case 120 can be exploded under a certain temperature condition and can be exploded under a certain pressure condition. It is understood that in other embodiments, the bottom housing 120 may be made of other materials, such as an aluminum housing.
With continued reference to fig. 1, the battery cell 200 is mounted in the accommodating cavity 101. The battery cell 200 includes a winding core, a positive tab and a negative tab (not shown), and the positive tab and the negative tab are electrically connected to the winding core. Specifically, the winding core is formed by stacking a positive plate, a diaphragm and a negative plate in sequence and then winding, and a winding core hole 210 is formed in the center of the winding core after winding. The positive tab in positive tab and the book core is connected to realize the electric connection between positive tab and the book core. The negative electrode tab is electrically connected with the negative plate in the winding core so as to realize the electrical connection between the negative electrode tab and the winding core.
Referring to fig. 5 and 6 in combination, fig. 5 is a partial structural view of a portion a of the battery 1000 shown in fig. 1, and fig. 6 is a structural view of the top cap 310 in the partial structure shown in fig. 5.
The cap assembly 300 includes a cap 310, a pole post 320, and a fixing member 330, both the pole post 320 and the fixing member 330 being mounted to the cap 310. The fixing member 330 surrounds the pole 320, and is used for improving the firmness of the assembly between the pole 320 and the top cover 310, and avoiding the pole 320 and the top cover 310 from being separated due to the aging of the top cover 310, so that the sealing effect of the top cover assembly 300 is reduced, and the falling pole 320 applies pressure to the negative pole ear of the battery cell 200 to cause the fracture of the negative pole ear.
Specifically, the top cover 310 includes a bottom surface 311, a top surface 312, and a peripheral side surface 313, wherein the bottom surface 311 and the top surface 312 are disposed opposite to each other, and the peripheral side surface 313 is disposed between the bottom surface 311 and the top surface 312. The bottom surface 311 is a surface of the top cover 310 facing the battery cell 200, and the top surface 312 is a surface of the top cover 310 facing away from the battery cell 200. The top cover 310 is mounted in the accommodating cavity 101 and disposed opposite to the bottom cover 120. The peripheral side surface 313 of the top cover 310 abuts against the concave portion 111 to seal the opening of the accommodating cavity 101. The top surface 312 of the top cover 310 abuts the flange 112 to prevent the top cover 310 from being removed from the opening of the receiving cavity 101. In this embodiment, the top cover 310 is made of rubber. The top cover 310 is provided with a mounting hole 314 and a groove 315, the mounting hole 314 penetrates the top cover 310 along the thickness direction of the top cover 310, i.e. along the Z-axis direction, and the mounting hole 314 is communicated with the accommodating cavity 101. The opening of the groove 315 is formed on the top surface 312 of the top cover 310, and the groove 315 is disposed around the mounting hole 314 and communicates with the mounting hole 314.
The terminal post 320 is mounted in the mounting hole 314 and electrically connected to the battery cell 200, so as to electrically connect the cap assembly 300 and the battery cell 200. Specifically, the electrode post 320 in this embodiment is a negative electrode post, the electrode post 320 is electrically connected to a negative electrode tab in the battery cell 200 through the interposer 220, and a positive electrode tab in the battery cell 200 is electrically connected to the casing 100. The pole 320 is made of copper, and the interposer 220 may be a copper sheet. In other embodiments, the interposer 220 may not be provided, and the terminal post 320 is directly electrically connected to the negative electrode tab in the battery cell 200.
In this embodiment, the mounting hole 314 includes a first mounting portion 314a and a second mounting portion 314b, the opening of the first mounting portion 314a is disposed on the bottom surface 311 of the top cover 310, and the first mounting portion 314a is recessed from the bottom surface 311 to the top surface 312 of the top cover 310 and is communicated with the accommodating chamber 101. The second mounting portion 314b is located on the top side of the first mounting portion 314a and communicates with the first mounting portion 314 a. The second mounting portion 314b has an aperture smaller than that of the first mounting portion 314 a. The pole 320 includes a first post 320a and a second post 320b. The second cylinder 320b is fixedly connected to the top of the first cylinder 320a, and the diameter width of the second cylinder 320b is smaller than that of the first cylinder 320 a. The pour hole 321 penetrates both the first cylinder 320a and the second cylinder 320b in the thickness direction of the first cylinder 320a and the second cylinder 320b, that is, in the Z-axis direction. When the pole 320 is installed, the first post 320a is installed on the first installation portion 314a and abuts against the opening of the second installation portion 314b, so that the pole 320 can be prevented from being separated from the installation hole 314. The second post 320b is mounted to the second mounting portion 314b and protrudes relative to the opening of the second mounting portion 314 b. After the pole 320 is installed, the liquid injection hole 321 is communicated with the accommodating cavity 101, and corresponds to the winding hole 210 of the battery cell 200, so that the battery cell 200 is favorably and quickly filled with electrolyte.
The fixing member 330 is mounted in the groove 315 and disposed around the pole 320. Specifically, the fixing element 330 is in an expanded state and is in interference fit with the groove 315, so that the fixing element 330 abuts against the groove side wall of the groove 315 and the circumferential side surface of the pole 320, thereby improving the firmness of the assembly between the pole 320 and the top cover 310 and further preventing the pole 320 from falling off from the top cover 310. In this embodiment, the fixing member 330 is made of an irreversible thermal expansion material, and when the fixing member 330 is installed, the fixing member 330 is in interference fit with the groove 315 and is disposed around the terminal 320, so as to clamp the fixing terminal 320 by the fixing member 330, and then the fixing member 330 is in an expansion state by heating the fixing member 330, so that the fixing member 330 is abutted between the groove sidewall of the groove 315 and the circumferential side surface of the terminal 320, thereby improving the assembly firmness between the top cover 310 and the terminal 320, avoiding the terminal 320 and the top cover 310 from being separated due to the aging of the top cover 310, and further causing the problem that the sealing effect of the top cover assembly 300 is reduced and the falling terminal 320 applies pressure to the negative electrode tab of the battery cell 200 to break the negative electrode tab. Herein, the "irreversible thermal expansion material" in the present application means a material which undergoes irreversible expansion deformation under heating. Illustratively, the irreversible thermal expansion material is a thermally expansive one-way memory alloy, i.e., a memory alloy capable of undergoing irreversible expansion deformation under heating, such as a Zr — Cu alloy. It should be noted that one-way memory alloys can be obtained by conventional memory alloy training methods.
In the top cap subassembly 300 that this application embodiment provided, use irreversible thermal expansion material preparation mounting 330, make mounting 330 be in the expanded state and support and hold between the side all around of top cap 310 and utmost point post 320, in order to realize centre gripping utmost point post 320 and promote the firmness of assembly between top cap 310 and the utmost point post 320, avoided leading to utmost point post 320 and top cap 310 to break away from because of top cap 310 is ageing, thereby lead to the sealed effect of top cap subassembly 300 to reduce and lead to the utmost point post 320 that drops to exert pressure to the negative pole ear of electric core 200 and arouse the cracked problem of negative pole ear.
With continued reference to fig. 5, in this embodiment, the pole 320 further has a liquid injection hole 321, the fixing member 330 has a through hole 331, and the cap assembly 300 further includes a sealing nail 340.
Specifically, the electrolyte injection hole 321 penetrates through the electrode post 320 along the thickness direction of the electrode post 320, namely, along the Z-axis direction, and is communicated with the accommodating cavity 101 and the outside of the battery 1000, and electrolyte can be injected into the battery cell 200 installed in the accommodating cavity 101 along the electrolyte injection hole 321. In this embodiment, the liquid inlet 321 penetrates both the first stem 320a and the second stem 320b in the thickness direction of the first stem 320a and the second stem 320b, that is, in the Z-axis direction. After the pole 320 is installed, the liquid injection hole 321 is communicated with the holding cavity 101, and corresponds to the winding hole 210 of the battery cell 200, so that the battery cell 200 is favorably and quickly filled with electrolyte. The pole 320 is made of a material that is generally more corrosion resistant than the top cover 310, and the problem that the top cover is easily clogged by the liquid injection hole 321 provided in the conventional pole 320 can be solved.
The through hole 331 penetrates the fixing member 330 in the thickness direction of the fixing member 330, i.e., in the Z-axis direction, and the through hole 331 communicates with the pour hole 321.
The sealing nail 340 penetrates the through hole 331 and seals the injection hole 321. In some embodiments, at least a portion of the sealing pin 340 is positioned at the pour spout 321 and seals the pour spout 321. In this embodiment, the sealing nail 340 is made of a conductive material, and the sealing nail 340 can increase the conductive cross-sectional area after extending into the injection hole 321 of the pole 320, so as to increase the overcurrent capacity of the pole 320, and further reduce the problem of local heating of the pole 320. Illustratively, the material of the seal pin 340 is a thermally expansive one-way memory alloy. After heating (for example, at 70 to 150 ℃), the sealing nail 340 can undergo high-temperature phase transition, so that the sealing nail 340 can strongly seal the liquid injection hole 321 and the through hole 331. Specifically, the seal nail 340 includes a fixing portion 341 and a sealing portion 342, the fixing portion 341 being fitted into the through-hole 331, the sealing portion 342 being connected to the fixing portion 341 and sealing the pour hole 321. In this embodiment, the fixing portion 341 is disposed around the sealing portion 342, and when the fixing portion 341 is installed in the through hole, the fixing portion 341 surrounding the sealing portion 342 can be abutted against the wall of the through hole 331, so that the fixing portion 341 and the through hole 331 are installed more stably.
The present embodiment further provides a method for manufacturing the battery 1000, including the following steps:
step S1, mounting the pole 320 in the mounting hole 314 of the top cover 310, and electrically connecting the pole 320 with the battery cell 200;
step S2, installing the battery cell 200 and the top cover 310 in the accommodating cavity 101;
step S3, injecting an electrolyte through the injection hole 321;
step S4, mounting the fixing member 330 on the top cover 310 and surrounding the post 320;
step S5, the sealing nail 340 penetrates through the through hole 331 and seals the liquid injection hole 321;
step S6, heating the fixing member 330 to a preset temperature, so that the fixing member 330 is in an expanded state;
wherein, the step S3 and the step S4 can exchange the sequence.
Specifically, in step S1, the terminal post 320 is welded to the negative electrode tab in the battery cell 200 by a welding method, so as to electrically connect the terminal post 320 to the battery cell 200, or after the terminal post 320 is welded to the interposer 220, the interposer 220 is welded to the negative electrode tab in the battery cell 200, so as to electrically connect the terminal post 320 to the battery cell 200.
In step S4, the fixing member 330 is mounted in the groove 315 of the top cover 310, and the pole 320 is inserted into the through hole 331, so that the fixing member 330 is mounted between the pole 320 and the top cover 310.
In the step S6, the preset temperature can be 70 to 150 ℃.
The embodiment of the application provides a preparation method of a battery 1000, install the mounting 330 earlier with the fixed utmost point post 320 of centre gripping to promote the firmness of assembly between utmost point post 320 and top cap 310, install sealed nail 340 again with sealed notes liquid hole 321, avoided because of installing sealed nail 340 earlier and can lead to the problem that utmost point post 320 tenesmus to utmost point post 320 application of force, thereby avoided utmost point post 320 and top cap 310 to break away from and avoided utmost point post 320 tenesmus can exert pressure to the negative pole ear of electric core 200 and arouse the cracked problem of negative pole ear.
When the top cover assembly 300 is heated, the fixing element 330 made of the thermally expanded one-way memory alloy can expand under a heating condition, and the fixing element 330 is in an expanded state and abuts against the peripheral side surfaces of the top cover 310 and the pole 320, so that the fixing element 330 can press the top cover 310 and clamp the pole 320, and strong sealing among the top cover 310, the fixing element 330 and the pole 320 is realized. In addition, the sealing nail 340 made of thermally expanded one-way memory alloy can expand inside the liquid injection hole 321 to achieve strong sealing of the liquid injection hole 321 by the sealing nail 340.
In some embodiments, step S7 is further included, the housing 100 is pressed to form the concave portion 111, and the concave portion 111 abuts against the peripheral side surface of the top cover 310 to achieve sealing, wherein step S6 and step S7 may be exchanged. The concave part 111 is formed by pressing the case 100, so that the concave part 111 abuts against the peripheral side surface 313 of the top cover 310, thereby further realizing the fastening and sealing between the case 100 and the top cover 310, and further improving the sealing performance of the battery 1000. According to the preparation method provided by the embodiment of the application, strong sealing between the shell 100 and the top cover 310 can be realized without welding between the shell 100 and the top cover 310, at least one welding procedure is saved, the preparation process is simplified, and the preparation efficiency of the battery 1000 is improved.
Referring to fig. 7 and 8, fig. 7 is a schematic structural diagram of a battery 1000 according to a second embodiment of the present application, and fig. 8 is an enlarged structural view of a fixing member 330 in the battery 1000 shown in fig. 7.
The battery 1000 of the present embodiment is different from the battery 1000 of the first embodiment in that the top cover assembly 300 of the battery 1000 of the present embodiment does not include the sealing nail 340, and the fixing member 330 is different from the fixing member 330 of the first embodiment in structure.
In this embodiment, the fixing member 330 seals the pour hole 321. Specifically, the fixing member 330 includes a holding portion 331 and a blocking portion 332. The lid portion 332 is fixed to the holding portion 331 and seals the pour hole 321. In this embodiment, the blocking portion 332 protrudes relative to the holding portion 331. When the fixing member 330 is installed, the holding portion 331 of the fixing member 330 is installed in the recess 315 of the top cap 310 and disposed around the post 320, and at least a portion of the blocking portion 332 is located in the injection hole 321 and seals the injection hole 321.
In addition, the material of the fixing member 330 in this embodiment is a thermally expanded one-way memory alloy, and by heating the fixing member 330, the clamping portion 331 and the blocking portion 332 can be expanded at the same time, so that the clamping portion 331 is in an expanded state and is abutted between the groove side wall of the groove 315 of the top cover 310 and the peripheral side surface of the pole 320, so that the clamping portion 331 can press the top cover 310 and clamp the pole 320, and thus strong sealing among the top cover 310, the fixing member 330 and the pole 320 is realized. Further, the lid portion 332 is capable of expanding inside the pouring hole 321 to achieve strong sealing of the lid portion 332 against the pouring hole 321.
Referring to fig. 9, fig. 9 is a schematic structural diagram of a battery 1000 according to a third embodiment of the present application.
The battery 1000 in the third embodiment is different from the battery 1000 in the first embodiment in that the terminal post 320 in the battery 1000 in the third embodiment is a positive terminal post, and the positive terminal post is electrically connected to a positive terminal tab in the battery cell 200.
Specifically, the battery 1000 of the present embodiment is further provided with a negative electrode tab 400. The negative electrode tab 400 is mounted on the bottom case 120 and electrically connected to the negative electrode tab of the battery cell 200.
While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.
Claims (11)
1. The top cover assembly is characterized by comprising a top cover, a pole and a fixing piece, wherein the top cover is provided with a mounting hole, the mounting hole penetrates through the top cover along the thickness direction of the top cover, the pole is mounted in the mounting hole, the fixing piece is mounted on the top cover and arranged around the pole, the fixing piece is made of an irreversible thermal expansion material, and is in an expansion state and abutted against the peripheral side face of the pole;
the pole is provided with a liquid injection hole, and the liquid injection hole penetrates through the pole along the thickness direction of the pole;
the fixing piece is provided with a through hole which penetrates through the fixing piece along the thickness direction of the fixing piece and is communicated with the liquid injection hole, the top cover assembly further comprises a sealing nail, the sealing nail comprises a fixing part and a sealing part, the fixing part is arranged in the through hole and abuts against the hole wall of the through hole, the sealing part is connected with the fixing part and seals the liquid injection hole,
or, the mounting includes clamping part and shutoff part, the clamping part encircles the utmost point post setting, and support hold in all sides of utmost point post, the shutoff part is fixed in the clamping part, and sealed annotate the liquid hole.
2. The top cap assembly of claim 1, wherein the top cap has a recess, an opening of the recess is formed on a top surface of the top cap, the recess is disposed around the mounting hole and is communicated with the mounting hole, and the fixing member is mounted in the recess and abuts against a side wall of the recess.
3. The header assembly of claim 1, wherein the material of the securing member is a thermally expansive one-way memory alloy.
4. The lid assembly of claim 1, wherein at least a portion of the sealing spike is positioned in and seals the pour spout.
5. The header assembly of claim 1, wherein the material of the seal spike is a conductive material.
6. The cap assembly of claim 5, wherein the material of the sealing spike is a thermally expansive one-way memory alloy.
7. A top cap assembly according to claim 1, wherein the stopper portion projects from the holder portion, at least part of the stopper portion being located at the pour hole and sealing the pour hole.
8. A battery, comprising a casing, a cell and the cap assembly of any one of claims 1 to 7, wherein the casing is provided with a containing cavity, an opening of the containing cavity is located at the top end of the casing, the cell and the cap assembly are both mounted in the containing cavity, and the cap assembly is located on one side of the cell facing the opening of the containing cavity.
9. The battery of claim 8, wherein the top cover has a hardness less than that of the case, and the case includes a recessed portion recessed toward the top cover and abutting against a peripheral side surface of the top cover.
10. A preparation method of a battery is characterized by comprising the following steps:
step S1, mounting a pole column in a mounting hole of a top cover, wherein the mounting hole penetrates through the top cover along the thickness direction of the top cover, the pole column is provided with a liquid injection hole, the liquid injection hole penetrates through the pole column along the thickness direction of the pole column, and the pole column is electrically connected with an electric core;
s2, mounting the battery cell and the top cover in an accommodating cavity of a shell;
s3, injecting electrolyte through the liquid injection hole;
s4, mounting a fixing piece on the top cover and surrounding the pole, wherein the fixing piece is provided with a through hole which penetrates through the fixing piece along the thickness direction of the fixing piece and is communicated with the liquid injection hole, and the fixing piece is made of an irreversible thermal expansion material;
s5, penetrating a sealing nail into the through hole and sealing the liquid injection hole;
s6, heating the fixing piece to a preset temperature to enable the fixing piece to be in an expansion state;
wherein, the step S3 and the step S4 can exchange the sequence.
11. The method of claim 10, further comprising a step S7 of pressing the housing to form a recess portion, wherein the recess portion abuts against the peripheral side surface of the top cover to achieve sealing, and wherein the steps S6 and S7 can be exchanged.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211245030.XA CN115312929B (en) | 2022-10-12 | 2022-10-12 | Top cover assembly, battery and preparation method of battery |
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| CN202211245030.XA CN115312929B (en) | 2022-10-12 | 2022-10-12 | Top cover assembly, battery and preparation method of battery |
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| CN115312929B true CN115312929B (en) | 2023-01-06 |
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| CN115882176A (en) * | 2023-02-09 | 2023-03-31 | 深圳海润新能源科技有限公司 | Insulating assembly, end cover assembly, energy storage device and electric equipment |
| CN117954751B (en) * | 2024-03-27 | 2024-05-31 | 徐州百思利新能源科技有限公司 | Secondary cell top cap subassembly and secondary cell |
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| JP2011181409A (en) * | 2010-03-02 | 2011-09-15 | Honda Motor Co Ltd | Battery and battery module |
| EP3182481A1 (en) * | 2015-12-17 | 2017-06-21 | 3M Innovative Properties Company | Pouch bag battery cells |
| CN112886156B (en) * | 2021-03-15 | 2023-10-24 | 贵州中瑞丰泰新能源科技有限公司 | Battery structure capable of injecting liquid from end part of pole and battery liquid injection method |
| CN114759321B (en) * | 2022-05-24 | 2024-03-08 | 厦门海辰储能科技股份有限公司 | Battery and sealing method |
| CN114843669A (en) * | 2022-05-24 | 2022-08-02 | 厦门海辰新能源科技有限公司 | Battery, method for disassembling sealing structure, and method for replenishing electrolyte |
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Address after: 518057 Research and Development Building 501, No. 6 Lanqing Second Road, Luhu Community, Guanhu Street, Longhua District, Shenzhen City, Guangdong Province, China Patentee after: Shenzhen Haichen Energy Storage Control Technology Co.,Ltd. Patentee after: Xiamen Haichen Energy Storage Technology Co.,Ltd. Address before: 518057 Room 2-B26, Peihong Building, No. 1 Kehui Road, Science and Technology Park Community, Yuehai Street, Nanshan District, Shenzhen, Guangdong, China Patentee before: Shenzhen Hairun New Energy Technology Co.,Ltd. Patentee before: Xiamen Haichen Energy Storage Technology Co.,Ltd. |
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Address after: 518057 Research and Development Building 501, No. 6 Lanqing Second Road, Luhu Community, Guanhu Street, Longhua District, Shenzhen City, Guangdong Province, China Patentee after: Shenzhen Haichen Energy Storage Technology Co.,Ltd. Country or region after: China Patentee after: Xiamen Haichen Energy Storage Technology Co.,Ltd. Address before: 518057 Research and Development Building 501, No. 6 Lanqing Second Road, Luhu Community, Guanhu Street, Longhua District, Shenzhen City, Guangdong Province, China Patentee before: Shenzhen Haichen Energy Storage Control Technology Co.,Ltd. Country or region before: China Patentee before: Xiamen Haichen Energy Storage Technology Co.,Ltd. |