CN116646655A - Top cap subassembly, power battery and power battery module - Google Patents
Top cap subassembly, power battery and power battery module Download PDFInfo
- Publication number
- CN116646655A CN116646655A CN202310736998.0A CN202310736998A CN116646655A CN 116646655 A CN116646655 A CN 116646655A CN 202310736998 A CN202310736998 A CN 202310736998A CN 116646655 A CN116646655 A CN 116646655A
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- cover plate
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- 238000007789 sealing Methods 0.000 claims abstract description 122
- 238000003466 welding Methods 0.000 claims abstract description 34
- 230000002093 peripheral effect Effects 0.000 claims description 23
- 238000000465 moulding Methods 0.000 claims description 21
- 238000003825 pressing Methods 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 18
- 238000002347 injection Methods 0.000 claims description 10
- 239000007924 injection Substances 0.000 claims description 10
- 238000002788 crimping Methods 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 9
- 230000000149 penetrating effect Effects 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000003792 electrolyte Substances 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 229920001973 fluoroelastomer Polymers 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
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
- 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
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion 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
- H01M50/172—Arrangements of electric connectors penetrating the casing
- H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
- H01M50/179—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells 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
- 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
- H01M50/184—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
- 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
- H01M50/20—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
- H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
- H01M50/213—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted 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
- 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
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
-
- 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)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The invention discloses a top cover assembly, a power battery and a power battery module, which comprises a shell which is provided with a cavity and is opened along one axial end, and a top cover assembly for closing the opening of the shell, wherein the top cover assembly comprises a cover plate, a step hole coaxially formed on the cover plate, a terminal penetrating through the step hole from the top of the cover plate, a pole column connected with the terminal from the bottom of the cover plate, a plastic body formed between the cover plate and the terminal and/or the pole column, and a sealing piece pressed between the plastic body and the terminal and the pole column; compared with the prior art, the double-sided sealing structure is adopted, so that the welding requirements of the pole and the terminal in the welding process are reduced, the plastic body can be insulated in the welding process, the production efficiency is high, and the air tightness is free from risk.
Description
Technical Field
The invention relates to the technical field of power batteries, in particular to a top cover assembly, a power battery and a power battery module.
Background
Along with the development of new energy industry, the lithium ion power battery (electric core) is used as a novel secondary battery, and is widely applied to the new energy field due to the advantages of high energy density, portability, long service life, safety, environmental protection and the like. The existing lithium ion power battery mainly comprises a shell, a battery cell arranged in the shell, and a top cover arranged on the shell and used for sealing and fixing the battery cell, wherein the top cover generally comprises a cover plate, a terminal and a pole penetrating through the cover plate, and a plastic part arranged between the cover plate and the terminal and the pole.
The existing seal ring is generally disposed between the cap plate and the post, and performs single-sided sealing of the post by using fluororubber, thereby requiring penetration welding at the contact position of the post and the terminal, thereby ensuring the air tightness of the inside of the battery. However, in the process of penetration welding, the welding requirement is higher, and the conditions of poor air tightness, poor tensile force and the like are caused in a large number of finished products due to the fact that false welding, explosion welding and the like are generated at great risk, so that the reliability of the products is poor, the yield is low, and waste of raw materials and processing cost of the products and low processing efficiency are caused.
Disclosure of Invention
Accordingly, the present invention is directed to a top cover assembly, a power battery and a power battery module, which solve the problems of poor air tightness and tensile force, poor reliability, low yield, low cost waste and low processing efficiency of the battery in the prior art.
In order to achieve the above object, according to one aspect of the present invention, a top cover assembly is provided, which includes a cover plate, a stepped hole coaxially formed on the cover plate, a terminal penetrating through the stepped hole from the top of the cover plate, a post connected to the terminal from the bottom of the cover plate, a molding body formed between the cover plate and the terminal and/or the post, and a sealing member crimped between the molding body and the terminal and the post, wherein a ring-shaped sealing cavity is formed around the cover plate, the molding body, the terminal and the post, and the sealing member is crimped in the sealing cavity.
In order to achieve the above object, another aspect of the present invention provides a power battery, including a housing having a cavity and a top cap assembly for closing the opening of the housing, wherein the top cap assembly is as described above, an inner joint surface is formed on the sealing member corresponding to the inner side of the sealing cavity, an outer joint surface is formed on the sealing member corresponding to the outer side of the sealing cavity, the inner joint surface is press-connected to the terminal and the post and seals the connection position of the terminal and the post, and the outer joint surface is press-connected to the cover plate and the plastic body and seals the connection position of the cover plate and the plastic body. Further, a first inner pressure-bonding surface in pressure-bonding connection with the terminal is formed on one side of the sealing element corresponding to the terminal, and a second inner pressure-bonding surface in pressure-bonding connection with the pole is formed on one side of the sealing element corresponding to the pole, and the first inner pressure-bonding surface is connected with the second inner pressure-bonding surface to form the inner connecting surface; the sealing element is provided with a first outer pressure welding surface which is in pressure welding connection with the plastic body, the sealing element is provided with a second outer pressure welding surface which is in partial pressure welding connection with the lower surface of the cover plate, and the first outer pressure welding surface and the second outer pressure welding surface are connected to form the outer connecting surface.
Further, the plastic body comprises an upper plastic part formed between the terminal and the cover plate and a lower plastic part formed between the pole and the lower surface of the cover plate, the upper plastic part is formed between the first external pressure joint surface and the inner wall of the stepped hole, the bottom of the upper plastic part is supported on the second external pressure joint surface, and the lower plastic part is circumferentially arranged on the outer side of the sealing part.
Further, the step hole comprises a first perforation communicated with the upper surface of the cover plate and having a larger diameter and a second perforation communicated with the lower surface of the cover plate and having a smaller diameter, and a first positioning table distributed along the circumferential direction protrudes upwards from the step surface of the first perforation;
the upper plastic part comprises a vertical plastic section and a horizontal plastic section, the vertical plastic section is annularly arranged on the inner peripheral surface of the second perforation, the horizontal plastic section integrally extends outwards from the top of the vertical plastic section and is supported on the step surface of the first perforation, a first positioning groove matched with the first positioning table in a positioning way is formed at the position of the horizontal plastic section corresponding to the first positioning table, the inner peripheral surface of the vertical plastic section is in pressure connection with the first external pressure connection surface, and the bottom of the vertical plastic section is supported on the second external pressure connection surface; the lower ends of the terminals penetrate through the vertical plastic sections, and the corresponding positions of the upper ends of the terminals are supported on the horizontal plastic sections.
Further, the lower plastic part comprises a plastic plate arranged on the lower surface of the cover plate and an annular wall formed by integrally extending downwards from the outer edge of the plastic plate, a through hole is coaxially formed in the plastic plate, the plastic plate is provided with an annular clamping section which is integrally formed and is close to one side of the through hole and an annular connecting section which is close to one side of the annular wall, and the annular clamping section is clamped between the lower surface of the cover plate and the upper surface of the pole.
Further, an annular first sealing cavity is formed between the outer peripheral surface of the lower end of the terminal and the inner peripheral surface of the vertical plastic section at intervals, an annular second sealing cavity is formed between the upper surface of the pole column and the lower surface of the cover plate at intervals, the first sealing cavity is communicated with the second sealing cavity to form a sealing cavity, and the sealing piece is pressed in the first sealing cavity and the second sealing cavity;
the sealing element comprises a vertical sealing section and a horizontal sealing section, wherein the vertical sealing section is pressed into the first sealing cavity, the horizontal sealing section integrally extends from the bottom of the vertical sealing section and is pressed into the second sealing cavity, the first inner pressing surface and the first outer pressing surface are respectively formed on the inner circumferential surface and the outer circumferential surface of the vertical sealing section, and the second inner pressing surface and the second outer pressing surface are respectively formed on the lower surface and the upper surface of the horizontal sealing section.
Further, the terminal comprises a main body part with a larger diameter and a pressing part which is integrally and coaxially formed from the lower surface of the main body part and has a smaller diameter, the outer peripheral surface of the pressing part and the inner peripheral surface of the vertical plastic section are arranged at intervals to form the first sealing cavity, and the pole is welded and fixed at the bottom of the pressing part.
Further, the pole comprises a pole plate and a contact salient point integrally protruding upwards from the upper surface of the pole plate, and the contact salient point is integrally formed by punching upwards from the bottom of the pole plate; the diameter of the contact protruding point is matched with the diameter of the pressing part, and the upper surface of the contact protruding point is welded and fixed with the bottom of the pressing part; the upper surface of the polar plate is provided with a second sealing cavity corresponding to the outer side of the contact convex point at intervals with the lower surface of the cover plate.
Further, the cover plate is eccentrically arranged in the liquid injection hole independent of the outside of the step hole, the liquid injection hole comprises a liquid collection hole communicated with the upper surface of the cover plate and a connecting hole communicated with the lower surface of the cover plate, and the liquid collection hole is in a conical structure with a large upper part and a small lower part.
Further, the top cover assembly further comprises a current collecting disc arranged at the bottom of the pole.
In order to achieve the above object, another aspect of the present invention provides a power battery module, which includes a housing and at least one power battery as described above disposed in the housing.
According to the invention, the sealing piece which can be in pressure connection with the corresponding positions of the terminal and the pole is arranged between the plastic body or the cover plate of the top cover assembly, so that the sealing of the connecting position between the terminal and the pole can be realized, the requirement of penetrable welding of the pole and the terminal can be reduced, the air tightness of the interior of the power battery is further increased, the reliability and the yield of products are improved, and the waste of the raw material cost and the processing cost of the products is reduced; meanwhile, the welding requirement is not high, and the production efficiency can be improved to a certain extent during welding. In addition, in the welding process to terminal and utmost point post, owing to the existence of sealing member, can isolate plastic body and terminal and utmost point post to play thermal-insulated effect to the plastic body, thereby reduce the influence that the high temperature led to the fact the plastic body, avoid plastic high temperature to warp, further improved reliability and yields and the gas tightness of product risk-free.
Drawings
Fig. 1 is a schematic structural diagram of a power battery according to an embodiment of the invention.
Fig. 2 is a schematic view of the structure of the cap assembly of fig. 1.
Fig. 3 is an exploded view of fig. 2.
Fig. 4 is a cross-sectional view of A-A in fig. 2.
Fig. 5 is another cross-sectional view (without seal) of fig. 2 A-A.
Fig. 6 is a schematic structural view of the seal.
Fig. 7 is a schematic structural view of the cover plate.
Fig. 8 is a schematic structural view of the upper plastic part.
Fig. 9 is a schematic structural view of the lower plastic part.
Fig. 10 is a schematic structural view of the terminal.
The specification reference numerals are as follows:
cover plate 10, step hole 11, first through hole 11a, second through hole 11b, step surface 11c, first positioning table 12, pouring hole 13, collecting hole 13a, connecting hole 13b, positioning column 14, seal 20, first inner crimp surface 20a, first outer crimp surface 20b, second inner crimp surface 20c, second outer crimp surface 20d, vertical seal segment 21, horizontal seal segment 22, molding body 30, upper plastic 31, vertical plastic segment 311, horizontal plastic segment 312, first positioning groove 312a, second positioning table 313, lower plastic 32, plastic plate 321, through hole 321a, through hole 321b, annular wall 322, terminal 40, main body 41, second positioning groove 41a, holding portion 42, pole 50, pole plate 51, contact bump 52, current collecting plate 60, first seal cavity 70a, second seal cavity 70b, housing 80, and top cover assembly 90.
Detailed Description
The following is a further detailed description of the embodiments:
examples
Fig. 1 is a schematic structural diagram of a power battery according to the present invention. The power battery comprises a shell 80 with an opening at one end along the axial direction and a cavity, and a top cover assembly 90 for closing the opening of the shell 80, wherein after the top cover assembly 90 is assembled with the shell 80, stable sealing inside the shell 80 can be realized, so that the power battery has no air tightness risk in the use process. Of course, in addition to this, the power battery further includes a battery core, an electrolyte, a negative electrode post, and the like disposed in the housing 80, and these structures can be implemented by using the prior art, which is not described in detail in this embodiment.
Referring to fig. 2, 3 and 4, the top cover assembly 90 includes a cover plate 10, a sealing member 20, a plastic body 30, a terminal 40 and a post 50, and the terminal 40 is coaxially disposed in the cover plate 10 from top to bottom of the cover plate 10 in the direction shown in fig. 3, and the post 50 is connected to the terminal 40 disposed in the cover plate 10 from bottom of the cover plate 10. The terminal 40 is far away from the terminal 50 and one end exposes in the top of apron 10 to be connected with the consumer and carry out electric energy transmission, the terminal 50 is kept away from the terminal 40 one end and is connected with the electric core through current collecting plate 60, the bottom of terminal 40 and the top of terminal 50 adopt the penetrable welded mode to be fixed for the terminal 50 can be with the electric energy that the inside electric core of battery produced through terminal 40 transmission to the consumer. The sealing member 20 and the plastic body 30 are sequentially arranged between the terminal 40 and the pole 50 and the cover plate 10 from inside to outside, the plastic body 30 is formed between the cover plate 10 and the terminal 40 and/or the pole 50, and the inner side of the sealing member 20 is fixed in a pressure-equalizing manner with the corresponding positions of the terminal 40 and the pole 50 so as to seal the connection positions of the bottom of the terminal 40 and the top of the pole 50, thereby reducing the welding requirement of penetrable welding between the terminal 40 and the pole 50; the outside of the sealing member 20 is fixed with the corresponding positions of the plastic body 30 and the cover plate 10 in a pressure-equalizing manner so as to seal the assembly gaps among the plastic body 30, the cover plate 10, the pole 50 and the terminal 40, and further after the power battery is prepared, the complete sealing of the inside of the power battery is realized, and the air tightness risk and the like of the prepared power battery are avoided.
With continued reference to fig. 5, a ring-shaped sealing cavity is formed between the cover plate 10, the plastic body 30, the terminal 40 and the pole 50, the shape of the sealing cavity is contoured with the sealing element 20, and the overall size of the sealing cavity is slightly smaller than that of the sealing element 20, so that the sealing element 20 can bear the extrusion from the corresponding positions of the cover plate 10, the plastic body 30, the terminal 40 and the pole 50 and be tightly pressed on the cover plate 10, the plastic body 30, the terminal 40 and the pole 50, thereby realizing stable sealing. In this embodiment, the cross section of the sealing cavity is generally in an "L" structure, the sealing cavity includes a first annular sealing cavity 70a and a second annular sealing cavity 70b, the first sealing cavity 70a is disposed in a vertical direction, the second sealing cavity 70b is disposed at the bottom of the first sealing cavity 70a in a horizontal direction and is in communication with the first sealing cavity 70a, the first sealing cavity 70a is formed by spacing an outer peripheral surface of a lower end of the terminal 40 from an inner peripheral surface of a position corresponding to the molding body 30, the second sealing cavity 70b is formed by spacing an upper surface of the pole 50 from a lower surface of the cover plate 10, and the sealing member 20 is press-fitted in the first sealing cavity 70a and the second sealing cavity 70b to seal the cover plate 10, the molding body 30, the terminal 40 and the pole 50.
Specifically, a first inner pressure-bonding surface 20a that is in pressure-bonding with the terminal 40 is formed on one side of the sealing member 20 corresponding to the terminal 40, and a first outer pressure-bonding surface 20b that is disposed opposite to the first inner pressure-bonding surface 20a is formed on the opposite side of the first inner pressure-bonding surface 20a (i.e. on the side corresponding to the molding body 30), and the first outer pressure-bonding surface 20b is in pressure-bonding with the corresponding position of the molding body 30, that is, the first inner pressure-bonding surface 20a and the first outer pressure-bonding surface 20b are in pressure-bonding with two opposite side walls of the first sealing cavity 70 a. One side of the sealing member 20 corresponding to the pole 50 is formed with a second inner pressure-bonding surface 20c which is bonded to the pole 50, and a second outer pressure-bonding surface 20d which is disposed opposite to the second inner pressure-bonding surface 20c is formed on the opposite side of the second inner pressure-bonding surface 20c (i.e., the side corresponding to the molding body 30 and/or the cover plate 10), and the second outer pressure-bonding surface 20d is partially bonded to the corresponding position of the molding body 30 and/or the cover plate 10, i.e., the second inner pressure-bonding surface 20c and the second outer pressure-bonding surface 20d are correspondingly bonded to two opposite side walls of the second sealing cavity 70 b.
The first inner pressure contact surface 20a and the second inner pressure contact surface 20c are connected to form an inner contact surface which is shaped like an L and is shaped like a seal cavity, the inner contact surface seals the connection position between the terminal 40 and the pole 50, the first outer pressure contact surface 20b and the second outer pressure contact surface 20d are connected to form an outer contact surface which is shaped like an L and is shaped like a seal cavity, and the outer contact surface seals the connection position between the plastic body 30 and the cover plate 10.
With continued reference to fig. 6, the seal 20 includes a vertical seal segment 21 press-fit into the first seal cavity 70a and a horizontal seal segment 22 integrally extending from the bottom of the vertical seal segment 21 and press-fit into the second seal cavity 70 b. In this embodiment, the cross section of the sealing member 20 is identical to the cross section of the sealing cavity, and is also an "L" cross section, the vertical sealing section 21 is disposed along the vertical direction, the horizontal sealing section 22 is integrally formed by extending outwards from the bottom of the vertical sealing section 21, the first inner pressure-bonding surface 20a and the first outer pressure-bonding surface 20b are respectively formed on the inner peripheral surface and the outer peripheral surface of the vertical sealing section 21, the second inner pressure-bonding surface 20c and the second outer pressure-bonding surface 20d are respectively formed on the lower surface and the upper surface of the horizontal sealing section 22, so that after the sealing member is correspondingly pressed in place, the first inner pressure-bonding surface 20a and the first outer pressure-bonding surface 20b can respectively press the cavity wall of the first sealing cavity 70a in the corresponding direction, and the second inner pressure-bonding surface 20c and the second outer pressure-bonding surface 20d can respectively press the cavity wall of the second sealing cavity 70b in the corresponding direction, so as to realize the sealing of the cover plate 10, the molding body 30, the terminal 40 and the post 50 in the corresponding positions, and ensure the air tightness inside the power battery.
With continued reference to fig. 7, the cover 10 is formed with a step hole 11 penetrating the cover 10 in the vertical direction, the step hole 11 is preferably coaxial with the cover 10, the terminal 40 is inserted into the step hole 11 from the top of the cover 10, the top of the terminal 40 is exposed at the upper end of the step hole 11 to serve as an electric power output end to be connected with an electric device, and the bottom of the terminal 40 is exposed at the lower end of the step hole 11 to be welded and fixed with the pole 50. Specifically, the step hole 11 includes a first through hole 11a and a second through hole 11b that are vertically connected, the first through hole 11a has a larger diameter and is connected to the upper surface of the cover plate 10, the second through hole 11b has a smaller diameter and is connected to the lower surface of the cover plate 10, so as to form a step surface 11c at the bottom of the first through hole 11a, and the corresponding side surface of the plastic body 30 is adapted to the dimensions of the first through hole 11a and the second through hole 11b when assembled, so that after the assembly is in place, the corresponding position of the plastic body 30 can be attached to the inner wall surfaces of the first through hole 11a and the second through hole 11b and supported on the step surface 11 c.
Preferably, first positioning platforms 12 distributed along the circumferential direction are protruded upwards on the step surface 11c of the first through hole 11 a; the first positioning table 12 is formed to protrude toward the molding body 30 supported on the step surface 11c so as to cooperate with the molding body 30 to position the molding body 30. In the present embodiment, two first positioning tables 12 are provided along the circumferential direction of the step surface 11c, and the two first positioning tables 12 are symmetrically provided, the first positioning tables 12 are formed in an integrally formed manner with the cover plate 10 to stably position the molding body 30, and in the integrally formed manner, no connection or assembly gap exists between the first positioning tables 12 and the cover plate 10, no additional sealing is required, and the overall strength of the cover plate 10 can be increased, so that the reliability of the top cover assembly is improved; it should be understood that in other embodiments, the number of the first positioning tables 12 is not limited to two, but may be one or more, and the structure is not limited to the structure shown in this embodiment, and may be a semicircle, a cylinder, a trapezoid bump, a bump, or the like, which is distributed on the step surface 11c and protrudes toward the molding body 30.
The cover plate 10 is eccentrically provided with a liquid injection hole 13 independent of the outside of the step hole 11, and the liquid injection hole 13 is used for injecting electrolyte into the power battery. In this embodiment, the liquid injection hole 13 includes a liquid collection hole 13a communicating with the upper surface of the cover plate 10 and a connection hole 13b communicating with the lower surface of the cover plate 10, where the liquid collection hole 13a is in a conical structure with a large top and a small bottom, and is configured in such a way that the liquid collection hole 13a is in an open arrangement, and can play a role of collecting electrolyte, so that the electrolyte is drained into the connection hole 13b and injected into the power battery. It will be appreciated that in other embodiments, the liquid injection hole 13 may be configured to directly collect and inject the electrolyte into the power battery in an overall tapered structure, or a plurality of evenly arranged collecting holes communicating with the liquid collection hole 13a may be disposed around the liquid collection hole 13a, so as to further enhance the collecting effect of the liquid collection hole 13 a.
Referring back to fig. 4 and 5, the molding body 30 includes an upper plastic member 31 formed between the terminal 40 and the cap plate 10 and a lower plastic member 32 formed between the post 50 and the lower surface of the cap plate 10, wherein the upper plastic member 31 and the lower plastic member 32 are used for isolating the cap plate 10 from the terminal 40 and the post 50 so as to prevent the cap plate 10 from being electrically conductive between the terminal 40 and the post 50 and from shorting.
The upper plastic part 31 is formed between the first external pressure contact surface 20b of the sealing part 20 and the inner wall of the step hole 11, the upper plastic part 31 is in an annular structure as a whole, so that the corresponding positions of the terminal 40 and the sealing part 20 can penetrate into the upper plastic part 31, the size of the outer peripheral surface of the upper plastic part 31 is contoured and matched with the shape of the step hole 11, and the first external pressure contact surface 20b is in pressure contact with the inner peripheral surface of the upper plastic part 31; when the upper plastic member 31 is assembled in place, the lower end of the upper plastic member 31 is inserted into the second through hole 11b and is crimped between the first external crimping surface 20b and the inner peripheral surface of the second through hole 11b, and the bottom of the upper plastic member 31 is supported and crimped on the second external crimping surface, and the upper end of the upper plastic member 31 is inserted into the first through hole 11a and is supported on the step surface 11c to isolate the cover plate 10 from the terminal 40.
Referring to fig. 8, the upper plastic member 31 includes a vertical plastic section 311 disposed around the inner peripheral surface of the second through hole 11b, and a horizontal plastic section 312 integrally extending from the top of the vertical plastic section 311 and supported on the step surface 11c of the first through hole 11a, wherein the lower end of the terminal 40 is disposed through the vertical plastic section 311, and the upper end of the terminal 40 is supported on the horizontal plastic section 312. Specifically, the vertical plastic section 311 is sandwiched between the inner wall of the second through hole 11b and the first external pressure contact surface 20b, so that after the whole top cover assembly is assembled, the inner peripheral surface of the vertical plastic section 311 can be pressed against the first external pressure contact surface 20b and the bottom of the vertical plastic section 311 is supported on the second external pressure contact surface 20 d; the horizontal plastic section 312 is sandwiched between the inner wall of the first through hole 11a and the step surface 11c and the terminal 40, and the terminal 40 is supported on the horizontal plastic section 312, so as to isolate the terminal 40 from the cover plate 10.
A first positioning groove 312a matched with the first positioning table 12 in a positioning way is formed on the horizontal plastic section 312 at a position corresponding to the first positioning table 12; when the plastic part 31 is assembled, the first positioning groove 312a can be matched with the first positioning table 12 to position the mounting position of the upper plastic part 31 so as to pre-position the upper plastic part 31, thereby avoiding the displacement of the upper plastic part 31 in the subsequent welding process to influence the welding quality and stably mounting the upper plastic part 31.
Preferably, the second positioning platforms 313 distributed along the circumferential direction protrude upwards from the inner side of the upper surface of the horizontal plastic section 312; the second positioning table 313 is formed protruding toward the terminal 40 supported on the horizontal plastic section 312 so as to be able to extend into a corresponding position of the terminal 40 to cooperate with the terminal 40 to position the assembly of the terminal 40. In the present embodiment, two second positioning tables 313 are circumferentially arranged along the upper surface of the horizontal plastic section 312, and the two second positioning tables 313 are symmetrically arranged, the second positioning tables 313 are formed by integrally forming with the horizontal plastic section 312 to stably position the terminal 40, and no connection or assembly gap exists between the second positioning tables 313 and the horizontal plastic section 312 in an integrally forming manner, so that no additional seal is needed, the overall strength of the upper plastic member 31 is increased, and the reliability of the top cover assembly is further improved; it should be understood that in other embodiments, the number of the second positioning tables 313 is not limited to two, but may be one or more, and the structure is not limited to the structure shown in this embodiment, and may be a semicircle, a cylinder, a trapezoid bump, a bump, or the like, which is distributed on the horizontal plastic section 312 and protrudes toward the terminal 40.
The lower plastic part 32 is circumferentially arranged at the outer side of the sealing part 20, and the whole lower plastic part 32 is in an annular structure so as to be penetrated by the corresponding position of the pole 50; after the lower plastic member 32 is assembled in place, the upper surface of the lower plastic member 32 is fixedly attached to the lower surface of the cover plate 10, and the inner edge of the lower plastic member 32 is clamped between the lower surface of the cover plate 10 and the upper surface of the pole 50 to isolate the cover plate 10 and the pole 50.
Referring to fig. 9, the lower plastic member 32 includes a plastic plate 321 disposed on the lower surface of the cover plate 10 and an annular wall 322 integrally extending downward from the outer edge of the plastic plate 321, wherein a through hole 321a is coaxially formed in the plastic plate 321 for allowing the top of the pole 50 to pass through and further contact with the bottom of the terminal 40 and be welded and fixed, and the diameter of the annular wall 322 is slightly smaller than that of the cover plate 10, so that the annular wall 322 can extend into the housing 80 of the power battery when the top cover assembly of the embodiment is assembled with the power battery, so that the housing 80 and the cover plate 10 can be contacted and welded conveniently. In this embodiment, the plastic plate 321 has an integrally formed annular clamping section near the through hole 321a and an annular connecting section near the annular wall 322, and the annular clamping section is clamped between the lower surface of the cover plate 10 and the upper surface of the pole 50, so as to isolate the cover plate 10 from the pole 50.
Preferably, a via 321b coaxial with the injection hole 13 is formed on the plastic plate 321 of the lower plastic member 32 at a position corresponding to the injection hole 13. Specifically, the positioning posts 14 that exceed the lower surface of the cover plate 10 are integrally formed at the positions of the cover plate 10 corresponding to the connecting holes 13b, and the positioning posts 14 are matched with the through holes 321b in size, so that when the lower plastic part 32 is assembled, the positioning posts 14 can be matched with the through holes 321b to pre-position the plastic part, and the lower plastic part 32 is ensured to be assembled accurately.
Referring to fig. 10, the terminal 40 includes a main body 41 having a larger diameter, and a pressing portion 42 having a smaller diameter and integrally and coaxially formed from a lower surface of the main body 41. The lower surface of the main body 41 has a portion that exceeds the lower surface of the holding portion 42, the portion of the lower surface of the main body 41 that exceeds the holding portion 42 is supported on the upper surface of the horizontal plastic section 312, the outer peripheral surface of the holding portion 42 and the inner peripheral surface of the vertical plastic section 311 are spaced apart to form the first sealing cavity 70a, and the top of the pole 50 is welded and fixed to the bottom of the holding portion 42.
A second positioning groove 41a is formed on the lower surface of the main body 41 corresponding to the outer side of the pressing portion 42, and the second positioning groove 41a is adapted to the second positioning table 313. When the terminal 40 is assembled, the second positioning groove 41a can cooperate with the second positioning table 313 to position the installation position of the terminal 40, so as to realize the pre-positioning of the terminal 40, and avoid the terminal 40 from being stressed in the welding process to cause the influence on the welding quality.
Referring back to fig. 4, the post 50 includes a plate 51 and a contact bump 52 integrally protruding upward from an upper surface of the plate 51. The upper surface of the polar plate 51 is fixed to the lower surface of the lower plastic part 32 (i.e., the lower surface of the annular clamping section of the plastic plate 321), the second sealing cavity 70b is formed by the upper surface of the polar plate 51 and the portion corresponding to the inner side of the annular clamping end and the lower surface of the cover plate 10 at intervals, and the lower surface of the polar plate 51 is fixed to the collecting plate 60. The contact protruding points 52 are integrally formed by stamping upwards from the bottom of the polar plate 51, so that no assembly gap or connection gap exists between the polar plate 51 and the contact protruding points 52, the air tightness is improved, the integral strength of the polar column 50 is enhanced, the welding strength and the temperature of penetrating welding in the assembly process can be born, and the heat of large current transmission in the working process can be born, so that the reliability of the polar column 50 is improved; the diameter of the contact bump 52 is adapted to the diameter of the holding portion 42, and the upper surface of the contact bump 52 is welded to the bottom of the holding portion 42, so as to achieve the electric power transmission between the pole 50 and the terminal 40.
In the present embodiment, first, the cover plate 10, the sealing member 20, the upper plastic member 31, the lower plastic member 32, the terminal 40, the pole 50 and the current collecting plate 60 are prefabricated and molded. Then, the lower surface of the electrode plate 51 is welded to the upper surface of the current collecting plate 60. Next, the upper plastic member 31 is inserted into the stepped hole 11 from top to bottom and is positioned in cooperation with the first positioning table 12 and the first positioning groove 312a, then the upper plastic member 31 is fixed in the stepped hole 11, the terminal 40 is assembled in the inner space formed by the upper plastic member 31 from top to bottom and is positioned in cooperation with the second positioning table 313 and the second positioning groove 41a, then the terminal 40 is fixed with the upper plastic member 31, and then the lower plastic member 32 is positioned and fixed on the lower surface of the cover plate 10 from bottom to top and in cooperation with the positioning post 14 and the through hole 321b. Then, the vertical sealing section 21 of the sealing member 20 is pushed into the first sealing cavity 70a formed by the outer peripheral surface of the pressing part 42 and the inner peripheral surface of the vertical plastic section 311, and the horizontal sealing section 22 of the sealing member 20 is abutted against the bottom of the vertical plastic section 311 and the lower surface of the cover plate 10. Finally, the bottom of the holding portion 42 of the terminal 40 is aligned with the top of the contact bump 52 of the pole 50, welded and fixed with the casing 80 in a penetrating welding manner, and then sealed, so that the power battery is assembled, and the power battery has good sealing effect, low welding requirement and high production efficiency.
In another embodiment of the present invention, a power battery module is provided, where the battery module includes a housing and at least one power battery as described above disposed in the housing, and when the plurality of power batteries are disposed in the housing, the plurality of power batteries may be distributed in an array, and each power battery is connected in series or parallel or a combination of series and parallel to provide electric energy for electric equipment.
Claims (12)
1. The utility model provides a top cap subassembly, includes the apron, coaxial formation in step hole on the apron, from wear to establish at the top of apron in the step hole the terminal, from the bottom of apron with terminal connection's utmost point post and form in moulding body between apron and terminal and/or the utmost point post, its characterized in that still includes the crimping in seal between moulding body and terminal and the utmost point post, it is annular sealed cavity to surround between apron, moulding body, terminal and the utmost point post, the seal crimping in the sealed cavity.
2. A power battery comprising a housing open at one end in an axial direction and having a cavity, and a top cap assembly closing the opening of the housing, characterized in that the top cap assembly is the top cap assembly of claim 1; the sealing element is provided with an inner joint surface corresponding to the inner side of the sealing cavity, the sealing element is provided with an outer joint surface corresponding to the outer side of the sealing cavity, the inner joint surface is in pressure connection with the terminal and the pole and seals the connection position of the terminal and the pole, and the outer joint surface is in pressure connection with the cover plate and the plastic body and seals the connection position of the cover plate and the plastic body.
3. The power cell as claimed in claim 2, wherein a first inner crimp surface crimped to the terminal is formed on a side of the sealing member corresponding to the terminal and a second inner crimp surface crimped to the post is formed on a side of the terminal, the first inner crimp surface and the second inner crimp surface being joined to form the inner joint surface; the sealing element is provided with a first outer pressure welding surface which is in pressure welding connection with the plastic body, the sealing element is provided with a second outer pressure welding surface which is in partial pressure welding connection with the lower surface of the cover plate, and the first outer pressure welding surface and the second outer pressure welding surface are connected to form the outer connecting surface.
4. The power cell of claim 3, wherein the molding body includes an upper plastic member formed between the terminal and the cap plate and a lower plastic member formed between the post and the lower surface of the cap plate, the upper plastic member being formed between the first external pressure contact surface and the inner wall of the stepped hole and the bottom of the upper plastic member being supported on the second external pressure contact surface, the lower plastic member being disposed outside the sealing member in a circumferential direction.
5. The power cell as claimed in claim 4, wherein the stepped hole includes a first through hole having a larger diameter communicating with an upper surface of the cap plate and a second through hole having a smaller diameter communicating with a lower surface of the cap plate, and a stepped surface of the first through hole protrudes upward with first positioning stages distributed in a circumferential direction;
the upper plastic part comprises a vertical plastic section and a horizontal plastic section, the vertical plastic section is annularly arranged on the inner peripheral surface of the second perforation, the horizontal plastic section integrally extends outwards from the top of the vertical plastic section and is supported on the step surface of the first perforation, a first positioning groove matched with the first positioning table in a positioning way is formed at the position of the horizontal plastic section corresponding to the first positioning table, the inner peripheral surface of the vertical plastic section is in pressure connection with the first external pressure connection surface, and the bottom of the vertical plastic section is supported on the second external pressure connection surface; the lower ends of the terminals penetrate through the vertical plastic sections, and the corresponding positions of the upper ends of the terminals are supported on the horizontal plastic sections.
6. The power battery according to claim 5, wherein the lower plastic member comprises a plastic plate arranged on the lower surface of the cover plate and an annular wall integrally extending downwards from the outer edge of the plastic plate, a through hole is coaxially formed in the plastic plate, the plastic plate is provided with an integrally formed annular clamping section near one side of the through hole and an annular connecting section near one side of the annular wall, and the annular clamping section is clamped between the lower surface of the cover plate and the upper surface of the pole.
7. The power battery according to claim 5, wherein an annular first sealing cavity is formed between the outer peripheral surface of the lower end of the terminal and the inner peripheral surface of the vertical plastic section, an annular second sealing cavity is formed between the upper surface of the pole and the lower surface of the cover plate, the first sealing cavity and the second sealing cavity are communicated to form the sealing cavity, and the sealing piece is pressed in the first sealing cavity and the second sealing cavity;
the sealing element comprises a vertical sealing section and a horizontal sealing section, wherein the vertical sealing section is pressed into the first sealing cavity, the horizontal sealing section integrally extends from the bottom of the vertical sealing section and is pressed into the second sealing cavity, the first inner pressing surface and the first outer pressing surface are respectively formed on the inner circumferential surface and the outer circumferential surface of the vertical sealing section, and the second inner pressing surface and the second outer pressing surface are respectively formed on the lower surface and the upper surface of the horizontal sealing section.
8. The power cell as claimed in claim 7, wherein the terminal includes a main body portion having a larger diameter and a pressing portion integrally and coaxially formed from a lower surface of the main body portion and having a smaller diameter, an outer circumferential surface of the pressing portion and an inner circumferential surface of the vertical plastic section are disposed at a distance from each other to form the first sealing chamber, and the post is welded and fixed to a bottom of the pressing portion.
9. The power cell as defined in claim 7, wherein the post comprises a plate and a contact bump integrally protruding upward from an upper surface of the plate, the contact bump being integrally punched upward from a bottom of the plate; the diameter of the contact protruding point is matched with the diameter of the pressing part, and the upper surface of the contact protruding point is welded and fixed with the bottom of the pressing part; the upper surface of the polar plate is provided with a second sealing cavity corresponding to the outer side of the contact convex point at intervals with the lower surface of the cover plate.
10. The power battery according to any one of claims 2 to 9, wherein the cover plate is eccentrically provided with a liquid injection hole independent from the outside of the step hole, the liquid injection hole comprises a liquid collection hole communicated with the upper surface of the cover plate and a connecting hole communicated with the lower surface of the cover plate, and the liquid collection hole is in a conical structure with a large upper part and a small lower part.
11. The power cell of any one of claims 2-9, wherein the top cap assembly further comprises a current collecting tray disposed at a bottom of the post.
12. A power battery module comprising a housing and at least one power battery as claimed in any one of claims 2 to 11 disposed within the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310736998.0A CN116646655A (en) | 2023-06-20 | 2023-06-20 | Top cap subassembly, power battery and power battery module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310736998.0A CN116646655A (en) | 2023-06-20 | 2023-06-20 | Top cap subassembly, power battery and power battery module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116646655A true CN116646655A (en) | 2023-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310736998.0A Pending CN116646655A (en) | 2023-06-20 | 2023-06-20 | Top cap subassembly, power battery and power battery module |
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| CN (1) | CN116646655A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116885358A (en) * | 2023-09-07 | 2023-10-13 | 常州瑞德丰精密技术有限公司 | Method for assembling battery top cover |
-
2023
- 2023-06-20 CN CN202310736998.0A patent/CN116646655A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116885358A (en) * | 2023-09-07 | 2023-10-13 | 常州瑞德丰精密技术有限公司 | Method for assembling battery top cover |
| CN116885358B (en) * | 2023-09-07 | 2023-11-14 | 常州瑞德丰精密技术有限公司 | Method for assembling battery top cover |
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