CN116683134B - Explosion-proof structure of cylindrical battery - Google Patents
Explosion-proof structure of cylindrical battery Download PDFInfo
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- CN116683134B CN116683134B CN202310968627.5A CN202310968627A CN116683134B CN 116683134 B CN116683134 B CN 116683134B CN 202310968627 A CN202310968627 A CN 202310968627A CN 116683134 B CN116683134 B CN 116683134B
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- battery
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- 239000007788 liquid Substances 0.000 claims abstract description 131
- 238000002347 injection Methods 0.000 claims abstract description 125
- 239000007924 injection Substances 0.000 claims abstract description 125
- 238000007789 sealing Methods 0.000 claims description 13
- 230000009471 action Effects 0.000 claims description 6
- 230000001154 acute effect Effects 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims 1
- 239000003792 electrolyte Substances 0.000 description 10
- 230000000694 effects Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000004880 explosion Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 238000004804 winding Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000010935 stainless steel Substances 0.000 description 3
- 229910001220 stainless steel Inorganic materials 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 229910001094 6061 aluminium alloy Inorganic materials 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 229920000181 Ethylene propylene rubber Polymers 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- DMFGNRRURHSENX-UHFFFAOYSA-N beryllium copper Chemical compound [Be].[Cu] DMFGNRRURHSENX-UHFFFAOYSA-N 0.000 description 1
- 229920005549 butyl rubber Polymers 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229920002681 hypalon Polymers 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000013585 weight reducing agent Substances 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
- H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
- H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
- H01M50/627—Filling ports
- H01M50/636—Closing or sealing filling ports, e.g. using lids
- H01M50/645—Plugs
-
- 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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/61—Types of temperature control
- H01M10/613—Cooling or keeping cold
-
- 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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/64—Heating or cooling; Temperature control characterised by the shape of the cells
- H01M10/643—Cylindrical cells
-
- 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
- H01M10/60—Heating or cooling; Temperature control
- H01M10/65—Means for temperature control structurally associated with the cells
- H01M10/654—Means for temperature control structurally associated with the cells located inside the innermost case of the cells, e.g. mandrels, electrodes or electrolytes
-
- 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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—Arrangements for facilitating escape of gases
-
- 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
- H01M50/531—Electrode connections inside a battery casing
- H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
-
- 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)
- Manufacturing & Machinery (AREA)
- Gas Exhaust Devices For Batteries (AREA)
- Filling, Topping-Up Batteries (AREA)
Abstract
The application discloses an explosion-proof structure of a large-size cylindrical battery, which belongs to the field of large-size cylindrical battery safety structures and comprises a battery shell, wherein a current collecting disc is arranged at the top in the battery shell, a cover cap is arranged on the current collecting disc, the cover cap completely covers the current collecting disc and seals the top of the battery shell, a liquid injection nail is arranged on the cover cap, a buckle structure is arranged on the liquid injection nail, one end of the buckle structure is fixed with the liquid injection nail, and the other end of the buckle structure is fixed with the current collecting disc. According to the application, the liquid injection hole of the large-size cylindrical battery is plugged in a mode of arranging the liquid injection nail, the liquid injection nail is used for forming a connection mode of a grapple clamp and a connecting mode on the current collecting disc, and the threshold value for limiting the internal pressure of the large-size cylindrical battery is popped up by using the deformation of the liquid injection nail, so that the battery bulge caused by the unbalance of the internal pressure of the large-size cylindrical battery is avoided, and the aim of reducing the safety risk of the battery is achieved.
Description
Technical Field
The application relates to the field of a safety structure of a cylindrical battery, in particular to an explosion-proof structure of the cylindrical battery.
Background
Along with the proposal of carbon peak and carbon neutralization targets, renewable energy and energy storage modes are trends of energy structure adjustment, and the battery market and the global energy transformation technology and policy development are greatly changed depending on related supply chains, so that the development of renewable energy and energy conservation are more convenient to use battery technology, and the development of batteries is promoted.
The current market is classified into three major forms according to the packaging types of batteries: cylindrical, square and soft package, the three kinds of battery designs are respectively divided into one place in the market, and the three kinds of battery designs have no absolute good and bad from the design perspective. All three shapes of cells will eventually become cylindrical, square and pouch cells by cylindrical winding, square winding and square stacking. However, only cylindrical batteries currently have consistency in manufacturing standards, such as the well-known cylindrical batteries, classified as 14650, 18650, 21700, 4680, etc.
The safety of the cylindrical battery cell is relatively high, and the high safety upper limit enables the cylindrical battery cell to support a chemical system with higher energy density, and is compatible with different chemical systems and application scenes. The large cylinder has very wide application scenes due to the large capacity and low cost, and widens the scene adaptability of the whole cylindrical battery under the background of technical improvement. Specifically, in addition to passenger vehicles, large cylindrical power batteries are used in the fields of commercial vehicles, special vehicles, including public service vehicles, heavy trucks, mine vehicles, agricultural machinery vehicles, industrial and commercial energy storage and the like.
In practical application, the cylindrical battery still has safety risk, because the cylindrical battery is a liquid battery, one of the most important risks is battery bulge, the battery bulge can bring a series of safety risks, and the most serious condition can even cause spontaneous combustion or explosion of the battery, so the problem that the battery bulge is to be solved urgently in the field of the cylindrical battery safety structure is avoided, the battery bulge is usually caused by pressure unbalance in the battery, the battery deformation can be caused due to overlarge pressure in the battery, and in order to avoid the battery deformation bulge, even spontaneous combustion or explosion occurs, the pressure release is needed in the battery.
Disclosure of Invention
The application aims to overcome the defect that the cylindrical battery cannot timely release pressure when internal pressure is unbalanced to cause the cylindrical battery to bulge or even explode safety risk, and provides an explosion-proof structure of the cylindrical battery.
The aim of the application is mainly realized by the following technical scheme:
the utility model provides an explosion-proof structure of cylinder battery, includes the battery casing, the top in the battery casing is equipped with the mass flow dish, be equipped with the block on the mass flow dish, the block covers completely the mass flow dish seals the top of battery casing be equipped with on the block annotate the liquid nail annotate and be equipped with buckle structure on the liquid nail, the one end of buckle structure is fixed with annotating the liquid nail, its other end with the mass flow dish is fixed.
Currently, most explosion-proof structures of super capacitors adopt a shell local thinning process. This process requires a thickness of the housing, but many cylindrical batteries employ thin-walled housing mechanisms in order to increase battery energy density, or reduce cost, so the described partial shell thinning process is not suitable for use with relatively thin cylindrical battery housings. Based on the original adoption of the thin-wall shell mechanism, the partial thinning can cause over-weak bearing capacity, the pressure relief position is not easy to determine, and the stability of the whole structure of the battery can be reduced.
According to the embodiment of the application, the internal pressure of the battery is limited by arranging the liquid injection nail on the cover cap, when the internal pressure of the battery does not reach the threshold value, the liquid injection nail can keep the tightness of the battery through the traction of the clamping structure, when the internal pressure of the battery exceeds the threshold value, the clamping structure is separated from the card and the state, and the internal pressure of the battery can eject the liquid injection nail, so that the aim of pressure relief is achieved. According to the embodiment of the application, the voltage limiting structure is not independently arranged, and electrolyte is required to be injected into the battery, so that the original structure for blocking the electrolyte is replaced by a structure with a pressure relief effect by utilizing the position of injecting the electrolyte on the cap, and the influence of the structure on the overall stability of the battery is avoided on the basis of effectively utilizing the original structure of the battery, so that the pressure relief effect can be achieved, and the stability of the battery structure is ensured not to be influenced. According to the application, the structure of plugging the electrolyte by using the liquid injection nail is utilized, and the buckle structure is arranged, so that the buckle structure can be disconnected when the internal pressure of the battery exceeds a pressure threshold value, and the liquid injection nail can be pushed out of the cap when the internal pressure of the battery is unbalanced and the internal pressure is overlarge, so that a pressure relief opening is formed at the position of the liquid injection nail, the battery bulge caused by the internal pressure unbalance or the overlarge internal pressure of the battery is avoided, and the safety risk of the power battery in the use process is effectively reduced.
Further, the buckle structure comprises a liquid injection nail grapple and a grapple clamping table, one end of the liquid injection nail grapple is fixed with the liquid injection nail, the other end of the liquid injection nail grapple is clamped with the grapple clamping table, and the grapple clamping table is fixed with the collecting disc.
In the embodiment of the application, the liquid injection nail grapple hook is clamped with the grapple hook clamping table, the fixed connection of the liquid injection nail grapple hook and the grapple hook clamping table is formed in a clamping mode, when the pressure in the battery is unbalanced or exceeds a pressure threshold value, the liquid injection nail grapple hook can deform, so that tight fit between the liquid injection nail grapple hook and the grapple hook clamping table is lost, the liquid injection nail grapple hook is separated from the grapple hook clamping table, the connection of a clamping structure is broken, and the liquid injection nail is ejected out of the cap under the action of the pressure.
Further, the liquid injection nail grabbing hook comprises a pressure-bearing section and a plurality of external grabbing hooks, wherein a clamp and a groove are formed in the grabbing hook clamping table, one end of each external grabbing hook is fixed with the pressure-bearing section, the other end of each external grabbing hook is embedded into the clamp and the groove, and a gap is reserved between the end face of the pressure-bearing section and the end face of the grabbing hook clamping table.
In the embodiment of the application, the pressure-bearing section of the liquid injection nail grapple is used for bearing the pressure action inside the battery, and is clamped and connected with the grapple clamping table through the external grapple, when the pressure inside the battery is unbalanced or the pressure inside the battery exceeds a pressure threshold value, the external grapple loses the clamping and connection with the grapple clamping table in a deformation mode, a gap is reserved between the end face of the pressure-bearing section and the end face of the grapple clamping table, and the pressure inside the battery has enough action area in the pressure-bearing section through the retention of the gap, so that the liquid injection nail can be ejected more stably when the pressure inside the battery is unbalanced or the pressure inside the battery exceeds the pressure threshold value, and the pressure release is completed.
Further, the cap is provided with a liquid injection hole close-fitting groove, the liquid injection nail is provided with a liquid injection nail close-fitting boss, and the liquid injection nail close-fitting boss is embedded into the liquid injection hole close-fitting groove.
In the embodiment of the application, in order to adapt to the explosion-proof pressure required by the battery, the limit of the liquid injection nail is enhanced at the position of the liquid injection hole by arranging the liquid injection hole close-fitting groove and the liquid injection nail close-fitting boss, so that the liquid injection nail can adapt to the explosion-proof pressure required by the battery.
Further, the injection hole close-fitting groove comprises an upper inclined plane and a lower inclined plane, the upper inclined plane and the lower inclined plane form an acute angle, and the injection nail close-fitting boss abuts against the upper inclined plane and the lower inclined plane;
the contact surface of the upper inclined surface and the lower inclined surface of the close-fit boss of the liquid injection nail is an arc surface.
In the embodiment of the application, the upper inclined plane and the lower inclined plane limit the tight-fit boss of the liquid injection nail through the included angle, and the cambered surface of the tight-fit boss of the liquid injection nail can enhance the tight-fit effect and simultaneously does not influence the release of the liquid injection nail from the liquid injection hole.
Further, a collecting disc annular boss is arranged between the collecting disc and the cap, the collecting disc annular boss is fixed with the collecting disc, a cap annular groove is formed in the cap, and the collecting disc annular boss is embedded into the cap annular groove.
In the embodiment of the application, the connection between the annular boss of the current collecting disc and the annular groove of the cap can further improve the close-fitting effect of the cap and the current collecting disc, thereby achieving the purpose of adapting to the explosion-proof pressure of the battery.
Further, a cap annular boss is further arranged between the collecting disc and the cap, the cap annular boss is fixed with the cap, a collecting disc annular groove is formed in the collecting disc, and the cap annular boss is embedded into the collecting disc annular groove;
the cover cap annular boss is sleeved outside the collecting disc annular boss, and a gap is reserved between the cover cap annular boss and the collecting disc annular boss.
In the embodiment of the application, the cover cap annular boss is arranged outside the collector disc annular boss, and the internal pressure of the battery born by the collector disc annular boss can be balanced through the arrangement of the cover cap annular boss, so that the pressure release direction in the battery is stably controlled, the controllability of the battery in an unstable state is ensured, and the safety risk is reduced.
Further, the annular boss of the collecting disc comprises a plurality of sections of boss pieces of the collecting disc which are uniformly spaced, wherein the boss pieces of the collecting disc are arc plates with the same radius, and the boss pieces of the collecting disc are embedded into the annular groove of the cap;
and a boss plate is fixed below the boss plate of the collecting plate, extends towards the center of the collecting plate and merges at the center of the collecting plate.
In the embodiment of the application, the boss sheets of the current collecting tray not only can lighten the weight of the battery in a spaced mode, but also can be communicated with the inside of the battery through the space between the boss sheets of the current collecting tray, so that the purpose that the liquid injection nails respond to ejection in time when the internal pressure is overlarge can be achieved, the boss sheets of the current collecting tray can be borne by the boss sheets of the current collecting tray, and the integrity of the battery at the current collecting tray can be improved in an interconnecting mode, thereby achieving the purpose of improving the stability of the battery.
Further, the cap annular boss is in a complete annular shape, and a current collecting disc insulating ring is arranged between the current collecting disc annular groove and the battery shell.
Further, the contact positions of the battery shell and the cap are provided with cap insulating rings;
the cover cap is provided with a liquid injection hole, the liquid injection nail is embedded into the liquid injection hole, and a liquid injection nail O-shaped gasket is arranged between the liquid injection nail and the liquid injection hole;
and a sealing O-shaped ring is arranged between the cap and the collecting disc.
In the embodiment of the application, the sealing performance is improved by the O-shaped gasket and the sealing O-shaped ring of the injection nail, and the electric connection between the cap and the shell is avoided by the cap insulating ring.
In summary, compared with the prior art, the application has the following beneficial effects:
firstly, the liquid injection opening of the cylindrical battery is plugged in a mode of arranging the liquid injection nail, a connecting mode of a grapple clamp and a connecting mode of the liquid injection nail on the current collecting disc is utilized, and the threshold value for limiting the internal pressure of the cylindrical battery is ejected out by deformation of the liquid injection nail, so that the battery bulge even explosion caused by unbalance of the internal pressure of the cylindrical battery is avoided, and the aim of reducing the safety risk of the battery is fulfilled. Secondly, when the diameter of the cylindrical battery is increased, heat generated inside the battery is difficult to conduct rapidly, so that the temperature difference between the inside and the outside is increased, and when the temperature is too high, electrolyte is decomposed and gasified, and the battery swells or even explodes. Therefore, the application can reduce the internal resistance of the battery, reduce the heat generation of the battery, increase the heat conduction area and more effectively control the temperature inside the battery by increasing the contact surface between the current collecting disc and the cap and matching with the cooling system of the battery module, thereby further reducing the risk of thermal failure and the explosion risk generated by the thermal failure. The core effects are as follows:
(1) Utilize annotate structure of liquid nail shutoff electrolyte, set up buckle structure, buckle structure can be when battery internal pressure surpasses pressure threshold value and disconnect to the guarantee annotates the liquid nail and can be by ejecting when battery internal pressure unbalance, internal pressure are too big the lid, thereby form the pressure release mouth in the position of annotating the liquid nail, avoid the unbalance of battery internal pressure or the too big battery bulge that forms of internal pressure, effectual reduction power battery is at the security risk in the use.
(2) A gap is reserved between the end face of the pressure-bearing section and the end face of the grapple clamping table, and through the reservation of the gap, the internal pressure of the battery is enabled to have a sufficient action area in the pressure-bearing section, so that when the pressure in the battery is unbalanced or exceeds a pressure threshold value, the liquid injection nail can be ejected more stably, and pressure relief is completed.
(3) Through set up lid annular boss, lid annular groove, current collecting disc annular boss and current collecting disc annular groove on the current collecting disc with the lid forms close-fitting relation, increases the contact surface between current collecting disc and the lid, reduces the battery internal resistance, reduces the battery and generates heat, increases the heat conduction area, cooperates the cooling system of battery module, makes the inside temperature of battery obtain more effective control to further reduce thermal failure risk and consequently the explosion risk that produces.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. In the drawings:
FIG. 1 is a schematic diagram of the structure of the present application;
FIG. 2 is a front view of the present application;
FIG. 3 is a schematic view of section A-A of FIG. 2 in accordance with the present application;
FIG. 4 is an enlarged partial schematic view of the area B of FIG. 3 in accordance with the present application;
FIG. 5 is a schematic view of the structure of the current collecting plate according to the present application;
the reference numerals denote: 1. capping; 2. a collecting tray; 3. injecting liquid nails; 4. injecting liquid and nailing the O-shaped gasket; 5. sealing the O-shaped ring; 6. capping the insulating ring; 7. a collecting disc insulating ring; 8. a battery case; 1-1, a cap annular boss; 1-2, a cap annular groove; 1-3; the liquid injection hole is tightly matched with the groove; 2-1, a collecting disc annular boss; 2-1-1, a boss sheet of a collecting disc; 2-1-2, a boss plate; 2-2, collecting disc annular grooves; 2-3, grapple clamping table; 3-1, a liquid injection nail grapple; 3-2, the injection nails are tightly matched with the bosses.
Detailed Description
For the purpose of making apparent the objects, technical solutions and advantages of the present application, the present application will be further described in detail with reference to the following examples and the accompanying drawings, wherein the exemplary embodiments of the present application and the descriptions thereof are for illustrating the present application only and are not to be construed as limiting the present application.
Examples:
as shown in fig. 1-5, this embodiment relates to an explosion-proof structure of a cylindrical battery in the field of a cylindrical battery safety structure, which comprises a battery housing 8, a current collecting disc 2 is arranged at the top in the battery housing 8, a cap 1 is arranged on the current collecting disc 2, the cap 1 completely covers the current collecting disc 2 and seals the top of the battery housing 8, a liquid injection nail 3 is arranged on the cap 1, a buckle structure is arranged on the liquid injection nail 3, one end of the buckle structure is fixed with the liquid injection nail 3, and the other end of the buckle structure is fixed with the current collecting disc 2.
According to the embodiment, the internal pressure of the battery is limited by arranging the liquid injection nail 3 on the cap 1, when the internal pressure of the battery does not reach the threshold value, the liquid injection nail 3 can keep the tightness of the battery through the traction of the clamping structure, when the internal pressure of the battery exceeds the threshold value, the clamping structure is separated from the card and the state, and the internal pressure of the battery can eject the liquid injection nail 3, so that the aim of pressure relief is achieved. The embodiment does not have a separate voltage limiting structure, and electrolyte is required to be injected into the battery, so that the original structure for blocking the electrolyte is replaced by a structure with a pressure relief effect by utilizing the position of the electrolyte injection on the cap 1 in the embodiment, and the influence of the structure on the overall stability of the battery is avoided on the basis of effectively utilizing the original structure of the battery, so that the pressure relief effect can be achieved, and the stability of the battery structure can be ensured.
The material of the liquid injection nail 3 can be beryllium copper alloy, stainless steel and the like; the cap 1 and the collecting plate 2 can be made of 6061 aluminum alloy, 1060 aluminum alloy and the like; the battery case 8 may be made of stainless steel, 6061 aluminum alloy, 1060 aluminum alloy, or the like.
The clamping structure comprises a liquid injection nail grapple 3-1 and a grapple clamping table 2-3, one end of the liquid injection nail grapple 3-1 is fixed with the liquid injection nail 3, the other end of the liquid injection nail grapple is clamped with the grapple clamping table 2-3, and the grapple clamping table 2-3 is fixed with the collecting disc 2.
The liquid injection nail grapple 3-1 comprises a pressure-bearing section and a plurality of external grapples, wherein a clamp and a groove are arranged on the grapple clamping table 2-3, one end of each external grapple is fixed with the pressure-bearing section, the other end of each external grapple is embedded into the clamp and the groove, and a gap is reserved between the end face of the pressure-bearing section and the end face of the grapple clamping table 2-3.
The cap 1 is provided with a liquid injection hole close-fitting groove 1-3, the liquid injection nail 3 is provided with a liquid injection nail close-fitting boss 3-2, and the liquid injection nail close-fitting boss 3-2 is embedded into the liquid injection hole close-fitting groove 1-3.
The injection hole close-fitting groove 1-3 comprises an upper inclined plane and a lower inclined plane, the upper inclined plane and the lower inclined plane form an acute angle, and the injection nail close-fitting boss 3-2 abuts against the upper inclined plane and the lower inclined plane;
the contact surface of the upper inclined surface and the lower inclined surface of the injection nail close-fit boss 3-2 is an arc surface.
The liquid injection nail grapple 3-1 on the liquid injection nail 3 is made of stainless steel or other high-strength and elastic metal or nonmetal materials, semicircular bulges are designed in the tail end of each liquid injection nail grapple 3-1 and can be buckled with the same-size semicircular grooves on the grapple clamping table 2-3 of the current collecting disc 2 to play a role in connection with the current collecting disc 2, and in order to increase the clamping force of the liquid injection nail 3 in the liquid injection hole, accidental falling can be prevented.
A collecting disc annular boss 2-1 is arranged between the collecting disc 2 and the cap 1, the collecting disc annular boss 2-1 is fixed with the collecting disc 2, a cap annular groove 1-2 is formed in the cap 1, and the collecting disc annular boss 2-1 is embedded into the cap annular groove 1-2.
A cap annular boss 1-1 is further arranged between the current collecting disc 2 and the cap 1, the cap annular boss 1-1 is fixed with the cap 1, a current collecting disc annular groove 2-2 is formed in the current collecting disc 2, and the cap annular boss 1-1 is embedded into the current collecting disc annular groove 2-2;
the annular boss 1-1 of the cap is sleeved outside the annular boss 2-1 of the collecting disc, and a gap is reserved between the annular boss 1-1 of the cap and the annular boss 2-1 of the collecting disc.
The annular boss 2-1 of the collecting disc comprises a plurality of sections of boss pieces 2-1-1 of the collecting disc which are uniformly spaced, the boss pieces 2-1-1 of the collecting disc are arc plates with the same radius, and the boss pieces 2-1-1 of the collecting disc are embedded into the annular groove 1-2 of the cover cap;
a boss plate 2-1-2 is fixed below the boss plate 2-1-1 of the collecting plate, and the boss plates 2-1-2 extend towards the center of the collecting plate 2 and meet at the center of the collecting plate 2.
The annular boss 1-1 of the cap is in a complete annular shape, and a collector disc insulating ring 7 is arranged between the annular groove 2-2 of the collector disc and the battery shell 8.
The upper part of the liquid injection nail 3 is provided with a circle of arc-shaped boss serving as a liquid injection nail close-fitting boss 3-2 which is close-fitting with the liquid injection hole close-fitting groove 1-3 on the cap 1. When gas is generated in the cylindrical battery and the air pressure is increased, the end face of the pressure-bearing section of the liquid injection nail grapple 3-1 is ejected out of the liquid injection hole under the action of pressure, so that the pressure in the battery cavity is released, and the danger of explosion of the battery is avoided. In addition, by adjusting the tight fit structure sizes of the liquid injection nail 3, the cap 1 and the current collecting disc 2, different explosion-proof pressures can be matched, so that the explosion-proof structure can be applied to different battery types and service scenes. The boss piece 2-1-1 of the collecting disc is embedded into the annular groove 1-2 of the cap, and the annular boss 1-1 of the cap is embedded into the annular groove 2-2 of the collecting disc, so that the contact area between the cap 1 and the collecting disc 2 can be effectively increased.
The contact area of the cap 1 and the current collecting disc 2 is increased, the internal resistance of the battery is reduced, the heat conduction of the battery is facilitated, the heat failure risk is reduced, and the cylindrical battery can be more effectively applied to the cylindrical battery.
On the basis, the battery weight can be reduced through the current collecting disc boss sheets 2-1-1 which are arranged at intervals, and the cruising ability of the electric automobile can be effectively improved through the weight reduction of the power battery.
The contact positions of the battery shell 8 and the cap 1 are respectively provided with a cap insulating ring 6;
the cap 1 is provided with a liquid injection hole, the liquid injection nail 3 is embedded into the liquid injection hole, and a liquid injection nail O-shaped gasket 4 is arranged between the liquid injection nail 3 and the liquid injection hole;
a sealing O-shaped ring 5 is arranged between the cap 1 and the collecting disc 2.
The cap insulating ring 6 and the collecting disc insulating ring 7 can be made of chlorosulfonated polyethylene rubber, ethylene propylene rubber, butyl rubber, neoprene rubber and the like.
In this embodiment, the inside and outside of the battery are isolated by sealing the pressing grooves of the O-ring (5) and the battery case (8).
In this example, the production and manufacture were carried out by the following method:
step 1: preparing materials: the battery comprises a cap 1, a collecting disc 2, a liquid injection nail 3, a liquid injection nail O-shaped gasket 4, a sealing O-shaped ring 5, a cap insulating ring 6, a collecting disc insulating ring 7 and a battery shell 8.
The mounting step comprises the following steps: the winding core is put into the shell, the current collecting disc 2 is welded, the rolling groove is formed, the cap 1 is pressed in, the sealing is carried out, and the liquid is injected.
Step 2: the battery core adopts a full tab process, the tab is pressed by rubbing, flattening or other processes before being put into the shell, and then the rolled core is put into the battery shell 8.
Step 3: the current collecting disc 2 is provided with four welding grooves, and the welding grooves of the current collecting disc 2 are welded with the lugs through laser welding equipment.
Step 4: the sealing O-shaped ring 5 is sleeved on the annular boss 1-1 of the cap, the current collecting disc insulating ring 7 is sleeved on the current collecting disc, and the cap 1 is tightly matched with the current collecting disc 2 in a pressurizing and heating mode.
Step 5: the groove rolling device is utilized to roll a groove on the periphery of the sealing O-shaped ring 5 above the current collecting disc insulating ring 7, the groove is used for fixing the winding core and the current collecting disc 2, so that the winding core and the current collecting disc are not swayed in the battery shell 8, the inside of the battery is ensured to be in a sealing state, and electrolyte is not leaked.
Step 6: the cap insulating ring 6 is sleeved on the cap 1, and the battery shell 8 is sealed inwards along the outer side of the cap insulating ring 6 by using a sealing machine.
Step 7: and the sealed battery is filled with liquid through a liquid injection nail opening above the cap 1. After the liquid is injected, the liquid injection nail O-shaped gasket 4 is sleeved into the liquid injection hole, then the liquid injection nail 3 is pressed in, and the liquid injection nail 3 is tightly connected with the cap 1 and the current collecting disc 2 in the liquid injection hole through a fastening structure.
The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the application, and is not meant to limit the scope of the application, but to limit the application to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the application are intended to be included within the scope of the application.
Claims (8)
1. The utility model provides an explosion-proof structure of cylinder battery, includes battery case (8), the top in battery case (8) is equipped with current collecting tray (2), be equipped with block (1) on current collecting tray (2), block (1) completely cover current collecting tray (2) and sealed the top of battery case (8), its characterized in that is equipped with annotate liquid nail (3) on block (1) annotate liquid nail (3) on be equipped with buckle structure, buckle structure's one end is fixed with annotate liquid nail (3), its other end is fixed with current collecting tray (2);
the clamping structure comprises a liquid injection nail grabbing hook (3-1) and a grabbing hook clamping table (2-3), one end of the liquid injection nail grabbing hook (3-1) is fixed with the liquid injection nail (3), the other end of the liquid injection nail grabbing hook is clamped with the grabbing hook clamping table (2-3), and the grabbing hook clamping table (2-3) is fixed with the collecting disc (2);
the injection nail grabbing hook (3-1) can deform under the action of the internal pressure of a battery and separate from the grabbing hook clamping table (2-3) to be ejected out of the cap (1);
the liquid injection nail grabbing hook (3-1) comprises a pressure-bearing section and a plurality of external grabbing hooks, wherein a clamp and a groove are formed in the grabbing hook clamping table (2-3), one end of each external grabbing hook is fixed with the pressure-bearing section, the other end of each external grabbing hook is embedded into the clamp and the groove, and a gap is reserved between the end face of the pressure-bearing section and the end face of the grabbing hook clamping table (2-3).
2. The explosion-proof structure of the cylindrical battery according to claim 1, wherein the cap (1) is provided with a liquid injection hole close-fitting groove (1-3), the liquid injection nail (3) is provided with a liquid injection nail close-fitting boss (3-2), and the liquid injection nail close-fitting boss (3-2) is embedded into the liquid injection hole close-fitting groove (1-3).
3. The explosion-proof structure of the cylindrical battery according to claim 2, wherein the liquid injection hole close-fitting groove (1-3) comprises an upper inclined plane and a lower inclined plane, the upper inclined plane and the lower inclined plane form an acute angle, and the liquid injection nail close-fitting boss (3-2) abuts against the upper inclined plane and the lower inclined plane;
the contact surface of the upper inclined surface and the lower inclined surface of the close-fit boss (3-2) of the liquid injection nail is an arc surface.
4. The explosion-proof structure of a cylindrical battery according to claim 1, wherein a collecting disc annular boss (2-1) is arranged between the collecting disc (2) and the cap (1), the collecting disc annular boss (2-1) is fixed with the collecting disc (2), a cap annular groove (1-2) is formed in the cap (1), and the collecting disc annular boss (2-1) is embedded in the cap annular groove (1-2).
5. The explosion-proof structure of a cylindrical battery according to claim 4, wherein a cap annular boss (1-1) is further arranged between the current collecting disc (2) and the cap (1), the cap annular boss (1-1) is fixed with the cap (1), a current collecting disc annular groove (2-2) is formed in the current collecting disc (2), and the cap annular boss (1-1) is embedded into the current collecting disc annular groove (2-2);
the cap annular boss (1-1) is sleeved outside the collecting disc annular boss (2-1), and a gap is reserved between the cap annular boss (1-1) and the collecting disc annular boss (2-1).
6. The explosion-proof structure of a cylindrical battery according to claim 5, wherein the current collecting disc annular boss (2-1) comprises a plurality of sections of current collecting disc boss pieces (2-1-1) which are uniformly spaced, the current collecting disc boss pieces (2-1-1) are arc plates with the same radius, and the current collecting disc boss pieces (2-1-1) are embedded into the cap annular groove (1-2);
a boss plate (2-1-2) is fixed below the boss sheet (2-1-1) of the collecting plate, and the boss plates (2-1-2) extend towards the center of the collecting plate (2) and are converged at the center of the collecting plate (2).
7. The explosion-proof structure of a cylindrical battery according to claim 5, wherein the cap annular boss (1-1) is in a complete annular shape, and a collector disc insulating ring (7) is arranged between the collector disc annular groove (2-2) and the battery case (8).
8. The explosion-proof structure of a cylindrical battery according to any one of claims 1 to 7, wherein the battery case (8) and the cap (1) are provided with cap insulation rings (6) at contact positions;
the cap (1) is provided with a liquid injection hole, the liquid injection nail (3) is embedded into the liquid injection hole, and a liquid injection nail O-shaped gasket (4) is arranged between the liquid injection nail (3) and the liquid injection hole;
a sealing O-shaped ring (5) is arranged between the cap (1) and the collecting disc (2).
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| CN117410642B (en) * | 2023-12-11 | 2024-02-27 | 无锡市金杨新材料股份有限公司 | Explosion-proof battery of liquid filling port |
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| CN116683134A (en) | 2023-09-01 |
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Address after: 611731 No. 88, Gu Nan Street, hi tech Zone, Chengdu City, Sichuan Province Patentee after: Zhongzi Technology Co.,Ltd. Country or region after: China Address before: 611731 No. 88, Gu Nan Street, hi tech Zone, Chengdu City, Sichuan Province Patentee before: Sinocat Environmental Technology Co.,Ltd. Country or region before: China |