CN116799388A - End cover assembly, energy storage device and electric equipment - Google Patents
End cover assembly, energy storage device and electric equipment Download PDFInfo
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- CN116799388A CN116799388A CN202311032236.9A CN202311032236A CN116799388A CN 116799388 A CN116799388 A CN 116799388A CN 202311032236 A CN202311032236 A CN 202311032236A CN 116799388 A CN116799388 A CN 116799388A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 130
- 239000004033 plastic Substances 0.000 claims abstract description 185
- 229920003023 plastic Polymers 0.000 claims abstract description 185
- 238000004880 explosion Methods 0.000 claims abstract description 94
- 230000000670 limiting effect Effects 0.000 claims abstract description 93
- 230000007306 turnover Effects 0.000 claims abstract description 23
- 230000000149 penetrating effect Effects 0.000 claims abstract description 8
- 239000011324 bead Substances 0.000 claims description 32
- 230000002093 peripheral effect Effects 0.000 claims description 15
- 230000013011 mating Effects 0.000 claims description 12
- 238000003825 pressing Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 9
- 238000009434 installation Methods 0.000 abstract description 3
- 238000003466 welding Methods 0.000 description 24
- 238000012545 processing Methods 0.000 description 20
- 238000007789 sealing Methods 0.000 description 20
- 238000000034 method Methods 0.000 description 19
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- 230000032683 aging Effects 0.000 description 8
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- 241001391944 Commicarpus scandens Species 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
-
- 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
- H01M2220/00—Batteries for particular applications
- H01M2220/10—Batteries in stationary systems, e.g. emergency power source in plant
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The application discloses an end cover assembly, an energy storage device and electric equipment. The end cover assembly comprises a top cover, an anti-explosion valve plate and lower plastic. The top cover is provided with a first surface and a second surface which are arranged in a back-to-back mode, and explosion-proof holes penetrating through the first surface and the second surface are formed in the top cover. The explosion-proof valve block is arranged at the explosion-proof hole. The explosion-proof valve block comprises an explosion-proof body and a turnover structure, wherein the explosion-proof body seals the explosion-proof hole and is fixed on the top cover, and the turnover structure extends from the circumferential edge of the explosion-proof body towards the direction deviating from the top cover. The position of the lower plastic corresponding to the overturning structure is provided with a limiting structure, and the limiting structure is clamped with the overturning structure. By adopting the end cover assembly, the problems that the material of the lower plastic is aged due to long-time use and the edge of the lower plastic sags due to deformation caused by the temperature of the energy storage device are avoided, the valve opening reliability of the anti-explosion valve plate and the safety performance of the energy storage device are improved, and the installation and the positioning of the lower plastic and the top cover are facilitated.
Description
Technical Field
The application relates to the technical field of energy storage, in particular to an end cover assembly, an energy storage device and electric equipment.
Background
With the increasing development of electrically powered devices, there is a high demand for the performance of the energy storage devices that supply energy thereto. Energy storage devices have been widely used because of their high energy density, high operating voltage, and long service life.
The end cap assembly of the existing energy storage device comprises a top cap and lower plastic connected with the top cap. However, the existing lower plastic is aged due to materials caused by long-time use and deformed due to the temperature of the energy storage device, so that the edge of the lower plastic sags, a larger gap is formed between the top cover and the lower plastic at the position of the anti-explosion valve plate cavity, and therefore impurity particles, tab fragments and other broken residues in the energy storage device easily drift to the anti-explosion valve plate cavity through the gap, the air leakage and the air collection of the anti-explosion valve plate cavity are affected, the valve opening reliability of the anti-explosion valve plate is affected, and the safety performance of the energy storage device is reduced.
Disclosure of Invention
Therefore, an objective of the present invention is to provide an end cover assembly, an energy storage device and an electric device, so as to solve the technical problems of low valve opening reliability of an anti-explosion valve plate and low safety performance of the energy storage device caused by sagging of edges of plastic in the prior art.
In a first aspect, the present application provides an end cap assembly comprising a top cap, an anti-pop valve sheet, and a lower plastic. The top cover is provided with a first surface and a second surface which are arranged in a back-to-back mode, and the top cover is provided with explosion-proof holes penetrating through the first surface and the second surface. The explosion-proof valve plate is arranged at the explosion-proof hole. The explosion-proof valve block comprises an explosion-proof body and a turnover structure, wherein the explosion-proof body seals the explosion-proof hole and is fixed on the top cover, and the turnover structure extends from the circumferential edge of the explosion-proof body towards the direction deviating from the top cover. The position of the lower plastic corresponding to the turnover structure is provided with a limiting structure, and the limiting structure is clamped with the turnover structure.
According to the application, based on the arrangement of the turnover structure on the explosion-proof body and the arrangement of the limit structure at the position of the lower plastic corresponding to the turnover structure, the limit structure is clamped with the turnover structure, on one hand, the limit structure can limit the lower plastic to move in the direction of deviating from the top cover in the height direction of the end cover assembly, so that the problem that the lower plastic sags at the edge due to ageing of materials caused by long-time use and deformation caused by the temperature of the energy storage device, and further impurity particles, tab fragments and other fragments in the energy storage device float below the explosion-proof valve plate through gaps formed by the sagged lower plastic and the top cover is avoided, and the valve opening reliability of the explosion-proof valve plate and the safety performance of the energy storage device are improved; on the other hand, the installation and the positioning of the lower plastic and the top cover are facilitated.
With reference to the first aspect, in certain implementation manners of the first aspect, the overturning structure is configured as two hems oppositely arranged along a length direction of the end cover assembly, and the limiting structure is configured as two limiting ribs arranged in one-to-one correspondence with the two hems. On the one hand, the processing forming and the mounting alignment of the turnover structure and the limiting structure are facilitated based on the setting positions of the design turnover structure and the limiting structure; on the other hand, the whole stress of the anti-explosion valve plate is uniform, the reliability and the stability of the connection of the anti-explosion valve plate and the top cover are improved, and the valve opening reliability of the anti-explosion valve plate is further improved.
With reference to the first aspect, in certain implementations of the first aspect, the flange includes an extension portion and a curled portion, the extension portion being connected between the explosion proof body and the curled portion, the curled portion pressing against the spacing bead in a height direction of the end cap assembly. On one hand, the structural design of the curled part enhances the structural strength of the curled part, improves the supporting effect of the curled part on the limiting convex ribs, prevents the edge of the lower plastic from sagging, and improves the valve opening reliability of the anti-explosion valve plate and the safety performance of the energy storage device; on the other hand, the curling part has a buffer function to absorb the acting force exerted by the lower plastic, and the acting force exerted by the lower plastic comprises the gravity of the lower plastic and deformation force generated by deformation, so that the stress concentration of the explosion-proof body is reduced, and the stability and the reliability of the connection between the explosion-proof body and the top cover are improved.
With reference to the first aspect, in some implementations of the first aspect, an extending direction of the extension portion and a plane where the explosion-proof body is located form a first included angle of an opening facing away from the limiting bead, and the first included angle is denoted as α, and the first included angle is an obtuse angle. On the basis of the design that the folded edges are arranged at an obtuse angle relative to the explosion-proof body, so that the explosion-proof valve plates form an arch structure with the front protruding and the back recessed, on one hand, the explosion-proof valve plates can be quickly stacked into a neat columnar structure, and the transportation is convenient; on the other hand, the problem that the middle parts of two adjacent explosion-proof valve plates after stacking rub at the positions corresponding to the explosion-proof holes to cause scraping of the explosion-proof valve plates is avoided, and the valve opening reliability of the explosion-proof valve plates is improved; on the other hand, the component of the acting force applied by the lower plastic to the folding edge in the height direction of the end cover assembly is reduced, so that the stability and the reliability of the connection between the explosion-proof body and the top cover are improved; in still another aspect, when the automatic clamping jaw clamps and welds the anti-explosion valve plates, the automatic clamping jaw can clamp the position of the anti-explosion body, so that the manipulator can clamp the stacked anti-explosion valve plates stably and rapidly conveniently.
With reference to the first aspect, in certain implementations of the first aspect, the first included angle is 110 ° to 150 °. When the first included angle is too small, on one hand, the difficulty of processing and forming of the folded edge is increased, on the other hand, when the anti-explosion valve plate is welded, the folded edge is easy to interfere with a laser welding device to influence the welding reliability, on the other hand, the temperature of a laser welding position is high, the energy is large, the requirement on the operation precision of the laser welding device is extremely high due to the too small angle of the first included angle, the welding operation is inconvenient, the folded edge is easily broken down by laser due to the deviation of the laser welding device, the production efficiency and the yield are reduced, and the cost is increased; when the first included angle is too large, on one hand, the difficulty of processing and forming of the limit ribs and the folded edges is increased, on the other hand, the clamping reliability of the folded edges and the limit ribs is poor, and under the condition that the energy storage device is heated for a long time, the limit ribs made of plastic materials arranged on the lower plastic are softened/deformed, so that the clamping with the folded edges cannot be realized, and the problems of ageing and sagging of the lower plastic are caused; the embodiment of the application is based on the design that the first included angle is larger than or equal to 110 degrees and smaller than or equal to 150 degrees, so that the difficulty in processing and forming of the limit ribs and the folded edges is reduced, the welding reliability of the anti-explosion valve plate is improved, the operation precision requirement on a laser welding device is reduced, the production efficiency and the yield are improved, the production cost is reduced, the clamping reliability of the folded edges and the limit ribs is improved, and the space utilization rate of the limit ribs and the folded edges is improved.
With reference to the first aspect, in some implementation manners of the first aspect, an extending direction of the limiting bead and a plane where the lower plastic is located form a second included angle with an opening facing away from the folded edge, and the second included angle is denoted as β, and an extending direction of the limiting bead and a central axis of the explosion-proof valve plate form a third included angle with an opening facing toward the top cover, and the third included angle is denoted as γ, where 5 ° is less than or equal to |α - β| is less than or equal to 10 °, and β+γ=180°. Therefore, on one hand, in order to facilitate the guiding when the limiting convex rib is clamped with the curled part, the position of the curled part is a guiding cambered surface, if the angle difference between the first included angle and the second included angle is too small, after the limiting convex rib is clamped with the folded edge, the limiting convex rib and the curled part slide easily due to the arrangement of the guiding cambered surface, and the clamping reliability is low; on the other hand, if the angle difference between the first angle and the second angle is too high, the following two cases occur. First kind: the first contained angle is too big and the second contained angle is too little, and the third contained angle is bigger this moment, consequently can appear curling portion and stretch into the position that the third contained angle corresponds when spacing protruding muscle and hem joint, but curling portion can't reliably with spacing protruding muscle butt and support and press, reduce the joint reliability, and then lead to down the structural stability of plastic poor, appear ageing and sagging easily. Second kind: the first included angle is too small, the second included angle is too large, and the third included angle is smaller at the moment, so that the overlapping area of the curled part and the limit convex rib is smaller when the limit convex rib and the limit convex rib are clamped, even the curled part cannot be clamped in the position corresponding to the third included angle, the clamping reliability is reduced, the assembly is inconvenient, the structural stability of lower plastic is poor, and ageing and sagging are easy to occur; on the other hand, the embodiment of the application is based on the design that the angle is more than or equal to 5 degrees and less than or equal to 10 degrees and the angle is more than or equal to beta and less than or equal to 180 degrees, and is convenient for processing and forming the limiting convex rib, improving the reliability of the clamping connection between the limiting convex rib and the folded edge, avoiding the plastic deformation of lower plastic in the assembly process and being incapable of being clamped with the folded edge, and being convenient for assembly and injection molding of the limiting convex rib.
With reference to the first aspect, in certain implementation manners of the first aspect, a height of the extension portion in a height direction of the end cover assembly is a first height, a height of the curled portion in the height direction of the end cover assembly is a second height, and a ratio of the second height to the first height is m, where 1/3.ltoreq.m.ltoreq.1/2. Therefore, when m is too small, the folded edges of the anti-explosion valve plates are pressed by the anti-explosion body after being stacked, so that the anti-explosion valve plates are scratched or even deformed; when m is too large, the gap between two adjacent anti-explosion valve plates after stacking is too large, so that the occupied volume in the transportation process is large, the space utilization rate is small, and the transportation cost is increased; the embodiment of the application is based on the design that m is more than or equal to 1/3 and less than or equal to 1/2, thereby avoiding the phenomenon that the folded edges of the anti-explosion valve plates are propped against after stacking, protecting the integrity of the anti-explosion valve plates, reducing the occupied volume of the stacking of the anti-explosion valve plates, and improving the space utilization rate and the transportation cost.
With reference to the first aspect, in certain implementation manners of the first aspect, the end portion of the extension portion away from the explosion proof body is curled from a direction away from the central axis of the explosion proof valve block toward a direction away from the central axis of the explosion proof valve block to form the curled portion. On the one hand, the processing and forming of the curled portion are facilitated based on the curled direction of the designed curled portion; on the other hand, pole piece fragments or other metal fragments are prevented from being hooked on the curled part, so that the use safety of the anti-explosion valve plate is improved; in still another aspect, the spacing bead can be along the crimping direction pressure equipment in the outside of crimping portion, prevents that the hem from taking place plastic deformation in the assembly process, improves packaging efficiency and equipment yield.
With reference to the first aspect, in certain implementation manners of the first aspect, the extension portion is protruding on a surface of the explosion-proof body facing the lower plastic. Based on the fact that the extension part is convexly arranged on the surface of the explosion-proof body, facing downwards, of the plastic, the side wall of the explosion-proof body can be welded with the top cover, the welding area of the explosion-proof body and the top cover is increased, and the reliability and the stability of connection between the explosion-proof valve plate and the top cover are improved; on the other hand, the stress point can be located at the junction of the extension part and the explosion-proof valve body, so that the risk that the explosion-proof valve plate is separated from the top cover is reduced.
In combination with the first aspect, in certain implementation manners of the first aspect, the limiting rib is configured to be an elastic structure, the lower plastic comprises a lower plastic plate and a gas-passing structure arranged at the end part of the lower plastic plate, which is close to the explosion-proof valve plate, the gas-passing structure comprises a connecting frame body and a shielding plate, the connecting frame body is connected with the lower plastic plate, the shielding plate is convexly arranged at one side, deviating from the top cover, of the connecting frame body, and the limiting rib is obliquely extended from the end part, deviating from the top cover, of the connecting frame body towards the direction of the explosion-proof hole. On one hand, plastic molding is facilitated, demolding of the injection mold is facilitated, the problem that the limiting convex ribs and the injection mold deform during demolding is avoided, and the production yield is improved; on the other hand, when the plastic is assembled, the lower plastic is sleeved outside the anti-explosion valve plate by applying external force to the limiting convex ribs, and the limiting convex ribs are abutted with the curled part of the folded edge when the external force is released, so that the plastic is conveniently installed on the top cover.
With reference to the first aspect, in certain implementation manners of the first aspect, a dimension of an orthographic projection of the connection frame body in a height direction of the end cover assembly is a first dimension, a dimension of an orthographic projection of the limit rib in the height direction of the end cover assembly is a second dimension, and a ratio n of the second dimension to the first dimension is equal to or greater than 1/2 and equal to or less than 2/3. Therefore, in the clamping process of the folded edge and the limiting convex rib, the limiting convex rib deforms when the curled part is propped against, if the ratio of the second size to the first size is too large, after the limiting convex rib and the curled part are propped against and deformed to be matched with each other in a clamping way, the orthographic projection of the deformed limiting convex rib in the height direction is larger than the first size, and at the moment, the occupied space of the clamping of the limiting convex rib and the folded edge in the height direction is large, so that the whole structure of the end cover assembly is not compact enough, and the space utilization rate is small; if the ratio of the second dimension to the first dimension is too small, the overlapping parts of the limiting convex ribs and the crimping parts in clamping fit are fewer, the reliability of the clamping fit is poor, and the structural stability of the lower plastic is poor; according to the embodiment of the application, the ratio of the second size to the first size is designed to be 1/2-2, so that the spacing ribs and the top cover are arranged at intervals, and therefore, in the process of assembling the lower plastic, the spacing ribs have enough deformation space, and the assembly efficiency, the clamping fit reliability and the structural stability of the lower plastic are improved.
With reference to the first aspect, in certain implementations of the first aspect, the spacing bead is disposed overlapping with an orthographic projection of the hem in a projection plane perpendicular to a height direction of the end cap assembly. Avoid the hem to break away from with spacing protruding joint of muscle to spacing protruding muscle can support the hem better, and convenient equipment.
With reference to the first aspect, in certain implementation manners of the first aspect, the air-passing structure forms a notch towards the accommodating groove of the top cover, the anti-explosion valve plate is accommodated in the accommodating groove, two sides of one side, away from the top cover, of the air-passing structure along the length direction of the end cover assembly are respectively provided with notches communicated with the accommodating groove, and the notches expose the folded edges and the limiting ribs. On the one hand, in the assembly process of the energy storage device, the anti-explosion valve plate is welded on the top cover, the welding assembly of the pole and the top cover is completed, and then the lower plastic is assembled with the aluminum sheet. Because the top cover and the explosion-proof valve plate can form a complete sealing structure at the explosion-proof hole after being welded, in the process of adopting top cover to bottom plastic to assemble from top to bottom or bottom plastic to top to assemble from top to bottom so as to complete the clamping and assembling of the bottom plastic and the explosion-proof valve, a user cannot visually align the assembly and check the assembling effect, and therefore, the application can visually align the hem and the limiting rib through the notch position of the bottom plastic to realize the clamping and assembling fixation and confirm the clamping and assembling effect when assembling by arranging the notch on the air passing structure of the bottom plastic explosion-proof valve and exposing the limiting rib, thereby reducing the operation precision, facilitating the operation and improving the assembling efficiency and the production efficiency; on the other hand, gas generated by the energy storage device can flow to the lower part of the anti-explosion valve plate through the notch, so that the valve opening reliability of the anti-explosion valve plate is improved.
With reference to the first aspect, in certain implementation manners of the first aspect, a dimension of the notch in a length direction of the end cover assembly is a third dimension, a dimension of an orthographic projection of the limit rib in a height direction perpendicular to the end cover assembly is a fourth dimension, and a ratio of the third dimension to the fourth dimension is s, wherein s is 1/2.ltoreq.s is less than or equal to 2/3. Therefore, if the ratio of the third dimension to the fourth dimension is too small, the overlapping part of the clamping fit of the limiting convex rib and the curled part is less, the clamping fit reliability is poor, and the structural stability of the lower plastic is poor; if the ratio of the third dimension to the fourth dimension is too large, the limit convex rib and the curled portion can shield the air passage on the side edge of the air passage structure after being pressed and deformed to be matched with each other in a clamping mode, air passage is affected, valve opening of the anti-explosion valve plate is inconvenient, and valve opening reliability of the anti-explosion valve plate is affected.
With reference to the first aspect, in certain implementation manners of the first aspect, a dimension of the notch in a length direction of the end cover assembly is a third dimension, a dimension of the gas passing structure in the length direction of the end cover assembly is a fifth dimension, and a ratio of the third dimension to the fifth dimension is t, wherein t is 1/10.ltoreq.t.ltoreq.1/8. Therefore, if the ratio of the third dimension to the fifth dimension is too small, the size of the notch is too small, the air passing effect of the air passing structure is affected, the valve opening of the anti-explosion valve block is inconvenient, the valve opening reliability of the anti-explosion valve block is affected, and in the clamping and matching process of the lower plastic and the anti-explosion valve block, a user cannot intuitively align the folded edge and the limiting convex rib, the operation precision is improved, and the assembly efficiency and the production efficiency are reduced. If the ratio of the third dimension to the fifth dimension is too large, the size of the notch is too large, and then impurity particles, tab fragments and other broken residues in the energy storage device easily pass through the notch and float below the anti-explosion valve plate, so that the valve opening reliability of the anti-explosion valve plate and the safety performance of the energy storage device are reduced. According to the embodiment of the application, the ratio of the third size to the fifth size is not less than 1/10 and not more than 1/8 based on the design, so that the broken slag such as impurity particles, tab fragments and the like in the energy storage device is prevented from drifting below the anti-explosion valve plate through the notch, the valve opening reliability of the anti-explosion valve plate and the safety performance of the energy storage device are improved, meanwhile, the assembly and positioning of the folded edge and the limiting convex rib are facilitated, the operation precision is reduced, the operation is facilitated, and the assembly efficiency and the production efficiency are improved.
In combination with the first aspect, in certain implementation manners of the first aspect, the gas passing structure further includes a supporting plate, the supporting plate is convexly disposed on one side of the shielding plate facing the top cover, and divides the accommodating groove into a first groove body and a second groove body, the anti-explosion valve plate is accommodated in the second groove body, and the limiting rib is disposed at a position of the connecting frame body corresponding to the second groove body and is located in the second groove body. On the one hand, based on the fact that the anti-explosion valve plate is contained in the second groove body, gas generated by the energy storage device can be better gathered at the accessory position of the anti-explosion valve plate, and the valve is convenient to open; on the other hand, the limiting convex ribs are arranged at the positions of the connecting frame body corresponding to the second groove body and are positioned in the second groove body, so that the limiting convex ribs are convenient to process and shape.
In combination with the first aspect, in some implementations of the first aspect, the top cover is provided with a first mounting hole penetrating through the first surface and the second surface, the lower plastic is provided with a third surface and a fourth surface which are arranged in a back-to-back manner, the lower plastic is provided with a second mounting hole penetrating through the third surface and the fourth surface, the end cover assembly further comprises a pole and a sealing ring, the pole comprises a flange part and a column part, the flange part is connected with one end of the column part, the column part is penetrated through the first mounting hole and the second mounting hole, and the sealing ring is sleeved outside the column part and is abutted to the side wall of the first mounting hole. On the one hand, the sealing ring is arranged to avoid the problem of short circuit caused by the fact that the column part of the pole is contacted with the side wall of the first mounting hole of the top cover; on the other hand, because the sealing washer can extrude the cylinder portion of utmost point post, consequently when plastics are gone up in follow-up moulding plastics, the sealing washer can avoid the cylinder portion of utmost point post to be close to the boss portion butt top cap of flange portion's first mounting hole's lateral wall and take place to scratch the phenomenon, reduces metal chip and produces the probability.
With reference to the first aspect, in certain implementations of the first aspect, the second surface is provided with a positioning portion, the third surface is provided with a mating portion, one of the positioning portion and the mating portion is configured as a blind hole, and the other of the positioning portion and the mating portion is configured as a protrusion, and the protrusion is accommodated in the blind hole. Therefore, on one hand, when the top cover and the lower plastic are assembled, the lower plastic is relatively close to the top cover and the protrusion extends into the blind hole, so that the positioning and the limiting of the lower plastic and the top cover are realized, and the column part of the pole and the side wall of the first mounting hole of the top cover are arranged at intervals, thereby avoiding the problem of short circuit caused by the contact of the column part of the pole and the side wall of the first mounting hole of the top cover; on the other hand, when plastics are injected and molded subsequently, the phenomenon that the column body of the pole is abutted against the side wall of the first mounting hole of the top cover and scratched is avoided, and the generation probability of metal scraps is reduced.
With reference to the first aspect, in certain implementation manners of the first aspect, a surface of the flange portion, on which the column portion is provided, is a first step surface, and an annular groove is formed on an outer peripheral surface of the column portion, so as to form a second step surface near one side of the flange portion, where the second step surface is located between the first surface and the second surface; the end cover assembly further comprises upper plastic, the upper plastic is sleeved on the column body and is abutted to the first surface, and the upper plastic further stretches into the annular groove and is abutted to the second step surface. Therefore, through the annular groove, the upper plastic can be tightly fixed on the top cover without being separated, and the upper plastic plays a role in insulation protection, so that the column part of the pole is only exposed from the end face of the flange part, and the other peripheries extending out of the top cover are surrounded by the upper plastic, thereby avoiding the occurrence of accidental electric shock.
With reference to the first aspect, in certain implementations of the first aspect, the seal ring includes a first end surface and a second end surface along an axial direction of the cylinder portion, the first end surface abuts against the first step surface, and the second end surface abuts against the upper plastic. Therefore, the upper plastic can play a role in fixing the sealing ring, so that the sealing ring is stable in structure, the column part of the pole is ensured to be completely separated from the top cover, and short circuit is avoided.
With reference to the first aspect, in some implementations of the first aspect, a protrusion height of a junction between the inner peripheral wall of the seal ring and the second end surface, relative to a junction between the outer peripheral wall of the seal ring and the second end surface, towards a side facing away from the flange portion is a third height, and denoted as H3, and satisfies 0.05mm < H3 < 0.55mm. Therefore, on one hand, the inner peripheral wall of the sealing ring is higher than the outer peripheral wall of the sealing ring, so that the column part of the blocking pole is contacted with the hole wall of the first mounting hole of the top cover, and short circuit is prevented; on the other hand, the H3 which is smaller than or equal to 0.05mm and smaller than or equal to 0.55mm is met, the distance between the column part and the side wall of the first mounting hole is reasonable, the sealing ring can penetrate between the column part and the side wall of the first mounting hole, and the sealing ring can apply enough abutting force to the column part and the side wall of the first mounting hole, so that stable fixation is realized. If H3 is less than 0.05mm, the distance between the column part and the side wall of the first mounting hole is too large, the enough abutting force applied to the column part and the side wall of the first mounting hole by the sealing ring is insufficient, the fixing effect is poor, and the loosening is easy. If H3 is greater than 0.55mm, the distance between the column part and the side wall of the first mounting hole is too small, and the tension of the sealing ring is too large, so that the sealing ring is easy to collapse.
In a second aspect, the present application provides an energy storage device comprising an end cap assembly as described above, thereby improving the safety and assembly of the energy storage device.
In a third aspect, the present application provides an electric device, including the energy storage device as described above, where the energy storage device provides electric energy for the electric device, so as to improve safety performance and assembly effect of the electric device.
Drawings
In order to more clearly illustrate the embodiments of the application or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the application, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a household energy storage scene diagram of an energy storage device according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of the energy storage device in fig. 1.
Fig. 3 is a schematic structural view of an end cap assembly of the energy storage device of fig. 2.
Fig. 4 is an exploded view of an end cap assembly of the energy storage device of fig. 2.
Fig. 5 is an enlarged view of the blast resistant valve panel of the end cap assembly of the energy storage device of fig. 2.
Fig. 6 is a schematic structural view of the blast gate panel of the end cap assembly of the energy storage device of fig. 2 after stacking.
Fig. 7 is a top view of an end cap assembly of the energy storage device of fig. 2.
Fig. 8 is a partial cross-sectional view of the end cap assembly of the energy storage device of fig. 7 taken along line A-A.
Fig. 9 is a partial cross-sectional view of the end cap assembly of the energy storage device of fig. 7 taken along line B-B.
Fig. 10 is a bottom view of a top cover of an end cap assembly of the energy storage device of fig. 7.
Fig. 11 is a partial cross-sectional view of the end cap assembly of the energy storage device of fig. 7 taken along line C-C.
Fig. 12 is an enlarged view of a portion of the end cap assembly of the energy storage device of fig. 11.
Fig. 13 is an enlarged view of portion I of the end cap assembly of the energy storage device of fig. 11.
The main reference numerals illustrate: 1-electric equipment, 2-wind energy conversion device, 3-electric energy conversion device, 5-energy storage device, 7-electric network, 10-shell, 20-end cover component, 30-top cover, 301-first surface, 302-second surface, 303-explosion-proof hole, 304-countersink, 305-first mounting hole, 306-positioning part, 307-second positioning groove, 40-lower plastic, 401-containing groove, 4011-first groove body, 4012-second groove body, 402-notch, 403-third surface, 404-fourth surface, 405-second mounting hole, 406-fitting part, 407-first positioning groove, 408-positioning boss, 41-limiting structure, 410-limiting convex rib, 420-first plastic piece, 440-second plastic piece, 42-lower plastic plate, 4201-first injection molding opening, 43-air-passing structure, 4301-second injection molding opening, 44-connection frame, 441-corner portion, 45-shielding plate, 451-bottom plate, 4511-ventilation hole, 452-side plate, 46-support plate, 50-explosion-proof valve plate, 501-positioning groove, 51-explosion-proof body, 5101-first side wall, 5102-second side wall, 511-pressure releasing portion, 512-fixing portion, 513-buffer portion, 52-turning structure, 520-hem, 521-extension portion, 522-crimping portion, 60-pole, 61-flange portion, 611-first step surface, 62-column portion, 621-annular groove, 622-second step surface, 70-sealing ring, 701-first end face, 702-second end face, 703-inner peripheral wall, 704-outer peripheral wall, 80-upper plastic, X-length direction, Y-width direction, Z-height direction, P-central axis, alpha-first included angle, beta-second angle, gamma-third angle, W1-first width, W2-second width, H1-first height, H2-second height, H3-third height, T1-first thickness, T2-second thickness, D1-first dimension, D2-second dimension, D3-third dimension, D4-fourth dimension, D5-fifth dimension, D1-first diameter, D2-second diameter.
The application will be further described in the following detailed description in conjunction with the above-described figures.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It is to be understood that the terminology used in the description and claims of the application and in the above description and drawings is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The terms first, second and the like in the description and in the claims and in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. The singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The term "comprising" and any variations thereof is intended to cover a non-exclusive inclusion. Furthermore, the present application may be embodied in many different forms and is not limited to the embodiments described in the present embodiment. The following specific examples are provided to facilitate a more thorough understanding of the present disclosure, in which terms indicating orientations of the components, up, down, left, right, etc., are merely for the locations of the illustrated structures in the corresponding drawings. In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "disposed on … …" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
The description is then made of the preferred embodiments for carrying out the application, however, the foregoing description is for the purpose of illustrating the general principles of the application and is not meant to limit the scope of the application. The protection scope of the present application is defined by the appended claims.
The basic concepts involved in the embodiments of the present application will be briefly described below.
The term "energy storage device" refers to a device that converts chemical energy stored in itself into electrical energy, i.e., a device that converts pre-stored energy into externally available electrical energy.
Because of the strong timeliness and space properties of energy required by people, in order to reasonably utilize the energy and improve the utilization rate of the energy, one energy form needs to be stored by one medium or equipment and then converted into another energy form, and the energy is released in a specific energy form based on future application. At present, the generation of green electric energy generally depends on photovoltaic, wind power, water potential and the like, but wind energy, solar energy and the like generally have the problems of strong intermittence and large fluctuation, which can cause unstable power grid, insufficient peak electricity consumption, too much electricity consumption and unstable voltage can cause damage to the electric power, so that the problem of 'wind abandoning and light abandoning' possibly occurs due to insufficient electricity consumption requirement or insufficient power grid acceptance, and the problem needs to be solved by relying on energy storage. The energy is converted into other forms of energy through physical or chemical means and is stored, the energy is converted into electric energy when needed and released, in short, the energy storage is similar to a large-scale 'charge pal', the electric energy is stored when the photovoltaic and wind energy are sufficient, and the stored electric power is released when needed.
Taking electrochemical energy storage as an example, the scheme provides an energy storage device, wherein a chemical battery is arranged in the energy storage device, chemical elements in the chemical battery are mainly used as energy storage media, and the charge and discharge process is accompanied with chemical reaction or change of the energy storage media.
The present energy storage (i.e. energy storage) application scenario is comparatively extensive, including aspects such as (wind, light) power generation side energy storage, electric wire netting side energy storage, basic station side energy storage and user side energy storage, and the kind of corresponding energy storage device includes:
(1) The large energy storage container applied to the energy storage scene at the power grid side can be used as a high-quality active and reactive power regulation power supply in the power grid, so that the load matching of electric energy in time and space is realized, the renewable energy consumption capability is enhanced, and the large energy storage container has great significance in the aspects of standby of a power grid system, relieving peak load power supply pressure and peak regulation and frequency modulation;
(2) The small and medium energy storage electric cabinet is applied to industrial and commercial energy storage scenes (banks, markets and the like) at the user side, and the main operation mode is peak clipping and valley filling. Because of the large price difference of the electricity charge at the peak-valley position according to the electricity consumption requirement, after the user has the energy storage device, in order to reduce the cost, the energy storage cabinet/box is charged usually in the electricity price valley period; and in the peak period of electricity price, the electricity in the energy storage device is released for use, so that the purpose of saving electricity charge is achieved. In addition, in remote areas and areas with high occurrence of natural disasters such as earthquake, hurricane and the like, the household energy storage device is equivalent to the fact that a user provides a standby power supply for the user and the power grid, and inconvenience caused by frequent power failure due to disasters or other reasons is avoided.
In the embodiment of the present application, a household energy storage scene in user side energy storage is taken as an example for illustration, and fig. 1 is a household energy storage scene diagram of an energy storage device 5 provided in the embodiment of the present application. It should be noted that the energy storage device 5 of the present application is not limited to a household energy storage scenario.
Referring to fig. 1, an energy storage device 5 according to an embodiment of the present application is applied to a household energy storage system, which includes an electric device 1, a wind energy conversion device 2 (such as, but not limited to, a fan), an electric energy conversion device 3 (such as, but not limited to, a photovoltaic panel), the energy storage device 5, and a power grid 7. The energy storage device 5 may be used as an energy storage cabinet and may be installed outdoors by, but not limited to, wall-hanging. In particular, the photovoltaic panel may convert solar energy into electrical energy during periods of low electricity prices, the energy storage device 5 being used to store this electrical energy and supply the grid 7 during periods of peak electricity prices, or to supply power during periods of outage/blackout of the grid 7. The transmission of the electric energy can be performed by adopting a high-voltage cable.
The number of the energy storage devices 5 may be plural, and the plural energy storage devices 5 are connected in series or in parallel, and the plural energy storage devices 5 are supported and electrically connected by using a separator (not shown). In the present embodiment, "a plurality of" means two or more. The energy storage device 5 may also be provided with an energy storage tank outside for accommodating the energy storage device 5.
It is understood that the energy storage device 5 may include, but is not limited to, a battery cell, a battery pack, a battery system, etc. When the energy storage device 5 is a single battery, it may be a prismatic battery. The practical application form of the energy storage device 5 provided in the embodiment of the present application may be, but not limited to, the listed products, and may also be other application forms, and the embodiment of the present application does not strictly limit the application form of the energy storage device 5. The embodiment of the present application will be described by taking the energy storage device 5 as a multi-core battery as an example.
Illustratively, the powered device 1 includes, but is not limited to, street lamps, industrial equipment, household appliances, and the like. The electric equipment 1 according to the embodiment of the application can also comprise, but is not limited to, large-scale equipment such as a wind power station, industrial and commercial power supply equipment, a power supply base station and the like. The energy storage device 5 may provide electrical energy to the consumer 1.
Referring to fig. 2, fig. 2 is a schematic structural diagram of the energy storage device 5 in fig. 1. The energy storage device 5 includes a housing 10, an end cap assembly 20, and an electrode assembly (not shown). The electrode assembly is disposed in the case 10, and the case 10 is fixedly connected with the cap assembly 20 in a sealed manner to realize the encapsulation of the electrode assembly. The electrode assembly is accommodated in the case 10. The housing 10 also serves to store an electrolyte therein so that the electrolyte can infiltrate the electrode assembly.
It should be noted that fig. 1 is only for schematically describing the arrangement of the case 10, the end cap assembly 20, and the electrode assembly, and is not intended to limit the connection positions, connection relationships, specific structures, and the like of the respective elements. Fig. 1 is merely a schematic structure of an energy storage device 5 according to an embodiment of the present application, and does not constitute a specific limitation of the energy storage device 5. In other embodiments of the present application, the energy storage device 5 may include more or fewer components than shown in FIG. 1, or certain components may be combined, or different components, for example, the energy storage device 5 may also include, but is not limited to, pole components, connection harnesses, and the like.
Referring to fig. 2, 3 and 4, fig. 3 is a schematic structural diagram of an end cap assembly 20 of the energy storage device 5 in fig. 2; fig. 4 is an exploded view of the end cap assembly 20 of the energy storage device 5 of fig. 2. The end cap assembly 20 includes a top cap 30, a lower plastic 40, and an anti-backup valve sheet 50. The top cover 30 has a first surface 301 and a second surface 302 disposed opposite to each other, and the top cover 30 is provided with explosion-proof holes 303 penetrating the first surface 301 and the second surface 302. The explosion proof valve block 50 is installed at the explosion proof hole 303. The explosion-proof valve plate 50 comprises an explosion-proof body 51 and a turnover structure 52, wherein the explosion-proof body 51 seals the explosion-proof hole 303 and is fixed on the top cover 30, and the turnover structure 52 extends from the circumferential edge of the explosion-proof body 51 towards the direction away from the top cover 30. The position of the lower plastic 40 corresponding to the turnover structure 52 is provided with a limiting structure 41, and the limiting structure 41 is clamped with the turnover structure 52.
According to the end cover assembly 20 provided by the embodiment of the application, based on the arrangement of the turnover structure 52 on the explosion-proof body 51 and the arrangement of the limit structure 41 at the position of the lower plastic 40 corresponding to the turnover structure 52, the limit structure 41 is clamped with the turnover structure 52, on one hand, the limit structure 41 can limit the lower plastic 40 to move in the direction away from the top cover 30 in the height direction Z of the end cover assembly 20, so that the material aging of the lower plastic 40 caused by long-time use and the edge sagging of the lower plastic 40 caused by the deformation of the energy storage device 5 caused by the temperature are avoided, the problem that the impurity particles, tab fragments and other fragments in the energy storage device 5 float below the explosion-proof valve plate 50 due to the clearance formed between the lower plastic 40 and the top cover 30 after sagging is avoided, and the valve opening reliability of the explosion-proof valve plate 50 and the safety performance of the energy storage device 5 are improved; on the other hand, the lower plastic 40 and the top cover 30 are conveniently installed and positioned.
For the sake of accuracy, reference is made herein to fig. 2 throughout this application to the direction, and the term "lengthwise X" refers to the lengthwise direction of the end cap assembly 20 along the cross-section perpendicular to the height direction Z, i.e., the left-right direction (where the X-axis is oriented to the right). The term "width direction Y" refers to the short side direction of the cross section of the end cap assembly 20 perpendicular to the height direction Z, i.e., the front-to-back direction (where the Y-axis forward direction is the back). The term "height direction Z" refers to an arrangement direction of the top cover 30 and the lower plastic 40, i.e., a direction parallel to a stacking direction of the top cover 30 and the lower plastic 40, i.e., an up-down direction (wherein a Z-axis forward direction is up). The length direction X, width direction Y, and height direction Z collectively form three orthogonal directions of the end cap assembly 20. For convenience of description, the vertical, horizontal, front-rear directions in the present application are relative positions, and are not limited to implementation. The length direction X, width direction Y and height direction Z of the end cap assembly 20 can be customized according to the specific structure of the product and the view angle of the drawing, and the application is not particularly limited.
Illustratively, in this embodiment, the flip structure 52 is configured as two flaps 520 disposed opposite along the length direction X of the end cap assembly 20. The limiting structure 41 is configured as two limiting ribs 410 disposed in one-to-one correspondence with the two folded edges 520. Therefore, on the basis of the arrangement positions of the design turning structure 52 and the limit structure 41, on one hand, the machining, forming and mounting alignment of the turning structure 52 and the limit structure 41 are facilitated; on the other hand, the whole stress of the anti-explosion valve plate 50 is uniform, the reliability and the stability of the connection between the anti-explosion valve plate 50 and the top cover 30 are improved, and the valve opening reliability of the anti-explosion valve plate 50 is further improved.
The two folded edges 520 and the explosion-proof body 51 are integrally formed, so that the connection strength of the two folded edges 520 and the explosion-proof body 51 is improved, the structural strength of the explosion-proof valve plate 50 is further improved, and the processing technology is further simplified, and the production efficiency and the assembly efficiency are further improved. In some embodiments, two flaps 520 are provided independent of explosion proof body 51, and two flaps 520 may be secured to explosion proof body 51 by, but not limited to, welding, locking, or other attachment means.
Referring to fig. 2, 4 and 5 together, fig. 5 is an enlarged view of the valve plate 50 of the end cap assembly 20 of the energy storage device 5 of fig. 2. The explosion-proof body 51 has an oval shape. The explosion proof body 51 includes two first side walls 5101 disposed opposite to each other in the length direction X of the end cap assembly 20 and two second side walls 5102 disposed opposite to each other in the width direction Y of the end cap assembly 20. The two first side walls 5101 are connected with the two second side walls 5102 and form the entire side wall of the explosion-proof body 51. Both first side walls 5101 are configured to be planar and parallel to the width direction Y of the end cap assembly 20. Both second side walls 5102 are configured as arc surfaces, and the bending directions are opposite. The explosion-proof body 51 is provided with folded edges 520 at both side portions of the end cap assembly 20 in the length direction X, respectively. For example, in the present embodiment, two folds 520 are respectively disposed near two first side walls 5101 of the explosion-proof body 51, so as to facilitate the forming of the two folds 520, avoid the problem that the folds 520 are easily broken when disposed at the second side walls 5102, and improve the structural strength of the folds 520, so as to better achieve the clamping and supporting effects on the limiting ribs 410. In some embodiments, two flaps 520 may also be provided at other locations of the explosion proof body 51, for example, the explosion proof body 51 is provided with flaps 520 at both sides of the end cap assembly 20 in the width direction Y, respectively. The location of the folded edge 520 may be designed according to the external shape of the explosion proof valve plate 50, and the present application is not particularly limited.
The flange 520 includes an extension 521 and a curl 522, the extension 521 is connected between the explosion-proof body 51 and the curl 522, and the curl 522 presses the stopper bead 410 in the height direction Z of the end cap assembly 20. On the one hand, the structural design of the curled portion 522 enhances the structural strength of the curled portion 522, improves the supporting effect of the curled portion 522 on the limiting ribs 410, prevents the edge of the lower plastic 40 from sagging, and improves the valve opening reliability of the anti-explosion valve plate 50 and the safety performance of the energy storage device 5; on the other hand, the curled portion 522 has a buffering function to absorb the force applied by the lower plastic 40, and the force applied by the lower plastic 40 includes the gravity of the lower plastic 40 and the deformation force generated by the deformation, so as to alleviate the stress concentration of the explosion-proof body 51 and improve the stability and reliability of the connection between the explosion-proof body 51 and the top cover 30.
Referring to fig. 2, 4, 5 and 6, fig. 6 is a schematic structural diagram of the valve plate 50 of the end cap assembly 20 of the energy storage device 5 in fig. 2 after stacking. The two folded edges 520 are bent with the body of the anti-explosion valve plate 50, and form a positioning groove 501. The size of the notch of the positioning groove 501 is a first width W1, and the size of the groove bottom of the positioning groove 501 is a second width W2, wherein the first width W1 is larger than the second width W2. In the present embodiment, the extending direction of the extending portion 521 forms a first angle with the plane of the explosion-proof body 51, and the first angle is denoted as α. The first included angle α is an obtuse angle. Therefore, based on the design that the folded edge 520 is arranged at an obtuse angle relative to the explosion-proof body 51, so that the explosion-proof valve plate 50 forms an arch structure with the front surface protruding and the back surface recessed, on one hand, the explosion-proof valve plate 50 can be quickly stacked into a neat columnar structure, and the transportation is convenient; on the other hand, the problem that the middle parts of two adjacent explosion-proof valve plates 50 after being stacked rub at the positions corresponding to the explosion-proof holes 303 to cause scraping of the explosion-proof valve plates 50 is avoided, and the valve opening reliability of the explosion-proof valve plates 50 is improved; in yet another aspect, the component of the force applied by lower plastic 40 to flange 520 in the height direction Z of end cap assembly 20 is reduced, thereby improving the stability and reliability of the connection of explosion-proof body 51 to top cap 30; in still another aspect, when the automated clamping jaw clamps the welded valve plates 50, the automated clamping jaw can clamp the position of the valve plate body 51, thereby facilitating the robot to stably and rapidly clamp the stacked valve plates 50.
The first included angle alpha is 110-150 deg.. Therefore, when the first included angle α is too small, on the one hand, the difficulty of processing and forming the folded edge 520 is increased, and on the other hand, when the anti-explosion valve plate 50 is welded, the folded edge is easy to interfere with the laser welding device, so that the welding reliability is affected, on the other hand, the temperature of the laser welding position is high, the energy is large, and when the angle of the first included angle α is too small, the requirement on the operation precision of the laser welding device is extremely high, the welding operation is inconvenient, and the folded edge 520 is easy to break down by laser due to the deviation of the laser welding device, so that the production efficiency and the yield are reduced, and the cost is increased; when the first included angle α is too large, on the one hand, the difficulty of processing and forming the limit ribs 410 and the folded edges 520 is increased, on the other hand, the reliability of the clamping connection between the folded edges 520 and the limit ribs 410 is poor, and under the condition that the energy storage device 5 is heated for a long time, the limit ribs 410 made of plastic materials arranged on the lower plastic 40 are softened/deformed, so that the clamping connection with the folded edges 520 cannot be realized, and the problems of ageing and sagging of the lower plastic 40 are caused; the embodiment of the application is based on the design that the first included angle alpha is larger than or equal to 110 degrees and smaller than or equal to 150 degrees, so that the difficulty in processing and forming of the limit ribs 410 and the limit ribs 520 is reduced, the welding reliability of the anti-explosion valve plate 50 is improved, the operation precision requirement on a laser welding device is reduced, the production efficiency and the yield are improved, the production cost is reduced, the clamping reliability of the limit ribs 410 and the limit ribs 520 is improved, and the space utilization rate of the limit ribs 410 and the limit ribs 520 is improved.
The extending direction of the limiting bead 410 and the plane of the lower plastic 40 form a second included angle of the opening facing away from the folded edge 520, and the second included angle is marked as beta, and the extending direction of the limiting bead 410 and the central axis P of the anti-explosion valve plate 50 form a third included angle of the opening facing the top cover 30, and the third included angle is marked as gamma, wherein the angle is more than or equal to 5 degrees and less than or equal to |alpha-beta| and less than or equal to 10 degrees, and the angle is more than or equal to 180 degrees. Therefore, on the one hand, in order to facilitate the guiding when the spacing rib 410 is clamped with the curled portion 522, the curled portion 522 is provided with a guiding cambered surface, if the angle difference between the first included angle α and the second included angle β is too small, after the spacing rib 410 is clamped with the folded edge 520, the spacing rib 410 and the curled portion 522 slide easily due to the arrangement of the guiding cambered surface, so that the clamping reliability is low; on the other hand, if the angle difference between the first angle α and the second angle β is too high, the following two cases occur. First kind: the first included angle α is too large and the second included angle β is too small, at this time, the third included angle γ is too large, so that the curled portion 522 extends into the position corresponding to the third included angle when the limiting rib 410 is clamped with the folded edge 520, but the curled portion 522 cannot reliably abut against and press against the limiting rib 410, so that the reliability of the clamping is reduced, and further, the structural stability of the lower plastic 40 is poor, and aging and sagging easily occur. Second kind: the first included angle α is too small and the second included angle β is too large, at this time, the third included angle γ is too small, so that the overlapping area of the curled portion 522 and the limiting rib 410 is too small when the limiting rib 410 and the folded edge 520 are clamped, and even the curled portion 522 cannot be clamped in the position corresponding to the third included angle γ, so that the reliability of clamping is reduced, the assembly is inconvenient, and the structural stability of the lower plastic 40 is poor, and ageing and sagging are easy to occur; in yet another aspect, the embodiment of the application is based on the design that the angle is equal to or less than or equal to 5 degrees and the angle is equal to or less than or equal to 10 degrees and the angle is equal to or less than 180 degrees, so that the processing and forming of the limit convex rib 410 are facilitated, the reliability of the clamping connection between the limit convex rib 410 and the folded edge 520 is improved, the situation that the lower plastic 40 is plastically deformed in the assembling process and cannot be clamped with the folded edge 520 is avoided, and the assembly and the injection molding of the limit convex rib 410 are facilitated. The angle difference between the first angle α and the second angle β may be, but is not limited to, 5 °, 6 °, 7 °, 8 °, 9 °, or 10 °.
The third included angle gamma is 10 degrees to 50 degrees. Therefore, when the third included angle gamma is smaller than 10 degrees, the processing and forming of the limiting convex rib 410 are inconvenient; when the third included angle gamma is smaller than 50 degrees, the space utilization rate of the limiting ribs 410 and the folded edges 520 is reduced, and the limiting ribs 410 are easy to generate plastic deformation so as to be unfavorable for the lower plastic 40 to be sleeved outside the anti-explosion valve plate 50; the embodiment of the application is based on the design that the folded edge 520 is arranged at an acute angle relative to the central axis P of the explosion-proof body 51, on one hand, the plastic 40 is prevented from being plastically deformed in the assembly process and being incapable of being clamped with the folded edge 520, and the assembly is convenient; on the other hand, injection molding of the spacing bead 410 is facilitated. The third included angle γ may be, but is not limited to, 10 °, 15 °, 20 °, 25 °, 30 °, 35 °, 40 °, 45 °, 50 °, etc.
The end of the extension 521 remote from the explosion proof body 51 is curled from the direction facing away from the central axis P of the explosion proof valve plate 50 toward the direction facing toward the central axis P of the explosion proof valve plate 50 to form the curled portion 522. Thus, on the one hand, the processing and forming of the curled portion 522 are facilitated based on the curl direction of the curled portion 522; on the other hand, the curled portion 522 is prevented from hooking pole piece fragments or other metal fragments, so that the use safety of the anti-explosion valve plate 50 is improved; in still another aspect, the limiting bead 410 can be press-fitted to the outer side of the curled portion 522 along the curling direction of the curled portion 522, so as to prevent the folded edge 520 from plastic deformation during the assembly process, and improve the assembly efficiency and the assembly yield.
Illustratively, in the present embodiment, the number of turns of the curl 522 is one. For example, the curled portion 522 is curled one turn to form a ring structure, thereby facilitating the forming of the folded edge 520, saving material, and reducing production cost. In some embodiments, the number of turns of the curl 522 may also be two, three, or more than three to increase the structural strength of the curl 522. The number of turns of the curl portion 522 is merely for illustration, and the present application is not particularly limited.
In this embodiment, the height of the extension 521 in the height direction Z of the end cap assembly 20 is a first height H1, the height of the curled portion 522 in the height direction Z of the end cap assembly 20 is a second height H2, and the first height H1 is greater than the second height H2, on one hand, the stress point of the flange 520 is concentrated at the root of the extension 521 facing away from the vent panel 50, so as to improve the stability and reliability of the connection between the vent body 51 and the top cover 30; on the other hand, the curled portion 522 can better press against the limiting bead 410, so that the lower plastic 40 can be tightly adhered to the top cover 30; in yet another aspect, the flange 520 of the valve block 50 is prevented from plastic deformation, and the problem of transportation failure due to unstable center of gravity of the valve block 50 after stacking is avoided.
In some embodiments, the ratio of the second height H2 to the first height H1 is m, wherein 1/3.ltoreq.m.ltoreq.1/2. When m is too small, the folded edges 520 of the explosion-proof valve plates 50 are pressed against the explosion-proof body 51 after being stacked, so that the explosion-proof valve plates 50 are scratched or even deformed; when m is too large, the gap between two adjacent anti-explosion valve plates 50 after stacking is too large, so that the occupied volume in the transportation process is large, the space utilization rate is small, and the transportation cost is increased; the embodiment of the application is based on the design that m is more than or equal to 1/3 and less than or equal to 1/2, so that the phenomenon that the folded edges 520 of the explosion-proof valve plates 50 are pressed by the explosion-proof body 51 after being stacked is avoided, the integrity of the explosion-proof valve plates 50 is protected, the occupied volume of the stack of the explosion-proof valve plates 50 is reduced, and the space utilization rate and the transportation cost are improved. It can be appreciated that, in the present embodiment, after the plurality of the valve plates 50 are stacked, the curled portions 522 of two adjacent valve plates 50 are abutted against each other, and the explosion proof body 51 and the folded edge 520 are disposed at intervals, so as to avoid the scraping or even deformation of the valve plates 50. The ratio of the second height H2 to the first height H1 may be, but is not limited to, 1/3, 1/25, 9/20, or 1/2, etc.
Referring to fig. 2, 4, 7 and 8, fig. 7 is a top view of the end cap assembly 20 of the energy storage device 5 of fig. 2; fig. 8 is a partial cross-sectional view of the end cap assembly 20 of the energy storage device 5 of fig. 7 taken along line A-A. The top cover 30 is provided with a countersunk head groove 304 communicated with the explosion-proof hole 303, the countersunk head groove 304 is recessed from the top cover 30 towards the second surface 302 of the lower plastic 40 back to the top cover 30, the explosion-proof body 51 comprises a fixing portion 512, a buffer portion 513 and a pressure release portion 511 which are sequentially connected, and the fixing portion 512 is fixed in the countersunk head groove 304. In this embodiment, the fixing portion 512 is welded to the bottom wall and the side walls of the countersunk groove 304. The relief portion 511 and the buffer portion 513 are exposed to the explosion proof hole 303. Therefore, the countersunk grooves 304 are formed in the second surface 302 of the top cover 30, so that the assembly and positioning of the valve block 50 and the top cover 30 are facilitated, and the welding area of the valve block 50 and the top cover 30 is increased, so that the connection strength between the valve block 50 and the top cover 30 is improved. In some embodiments, the securing portion 512 is welded only to the bottom wall of the countersink 304; alternatively, the fixing portion 512 of the explosion-proof body 51 may be directly welded to the second surface 302 of the top cover 30.
Optionally, in some embodiments, the thickness of the fixing portion 512 of the explosion-proof body 51 in the height direction Z of the end cover assembly 20 is a first thickness T1, the thickness of the extension portion 521 of the flange 520 is a second thickness T2, and the first thickness T1 is greater than the second thickness T2, so that, on one hand, the processing and forming of the flange 520 are facilitated, and on the other hand, the structural strength of the fixing portion 512 is improved, so as to better achieve the welding with the top cover 30, provide the connection strength between the top cover 30 and the explosion-proof valve plate 50, and further better compress the edge of the lower plastic 40. In this embodiment, the thickness of extension 521 is equal to the thickness of curl 522, thereby facilitating the forming of hem 520. In some embodiments, the thickness of the extension 521 is less than the thickness of the curl 522, thereby increasing the structural strength of the curl 522 from deformation to better compress the edges of the plastic 40. The thickness of the fixing portion 512 of the explosion-proof body 51 in the height direction Z of the end cap assembly 20 is greater than the thickness of the pressure relief portion 511 in the height direction Z of the end cap assembly 20, so that the pressure relief portion 511 has a good exhaust function. The buffer part 513 can relieve deformation of the anti-explosion valve plate 50 under different pressures, reduce the ageing probability of the anti-explosion valve plate 50 and prolong the service life of the energy storage device.
The limiting ribs 410 are configured as elastic structures, and the limiting ribs 410 extend obliquely from the lower plastic 40 toward the explosion-proof hole 303. Therefore, on one hand, the molding of the lower plastic 40 is facilitated, the demolding of the injection mold is facilitated, the problem that the limiting ribs 410 and the injection mold deform during demolding is avoided, and the production yield is improved; on the other hand, when the lower plastic 40 is assembled, the lower plastic 40 is sleeved outside the anti-explosion valve plate 50 by applying an external force to the limiting bead 410, and the limiting bead 410 is abutted against the curled portion 522 of the folded edge 520 when the external force is released, so that the lower plastic 40 is conveniently mounted on the top cover 30. In the present embodiment, the spacing ribs 410 and the lower plastic 40 are integrally injection molded, thereby facilitating processing and molding, and improving the connection strength and assembly efficiency of the spacing ribs 410 and the lower plastic 40.
The spacing ribs 410 are spaced apart from the top cover 30. Therefore, the spacing ribs 410 and the top cover 30 are arranged at intervals based on the design, so that the spacing ribs 410 have enough deformation space in the process of assembling the lower plastic 40, and the assembly efficiency of the lower plastic 40 is improved. The spacing bead 410 overlaps the orthographic projection of hem 520 in the direction Z of height of end cover assembly 20 to avoid hem 520 to break away from with the joint of spacing bead 410, thereby spacing bead 410 can support hem 520 better, and convenient equipment.
Referring to fig. 2, 4 and 7, the lower plastic 40 includes a lower plastic plate 42 and an air-passing structure 43 disposed at an end of the lower plastic plate 42 near the anti-explosion valve plate 50, the air-passing structure 43 forms a containing groove 401 with a notch facing the top cover 30, the anti-explosion valve plate 50 is contained in the containing groove 401, two sides of one side of the air-passing structure 43 facing away from the top cover 30 along the length direction X of the end cover assembly 20 are respectively provided with a notch 402 communicated with the containing groove 401, and the notch 402 exposes the folded edge 520 and the limiting ribs 410. Therefore, on one hand, the assembly and positioning of the folded edge 520 and the limiting ribs 410 are facilitated, and the assembly efficiency of the lower plastic 40, the anti-explosion valve plate 50 and the top cover 30 is improved; on the other hand, the gas generated by the energy storage device 5 can flow to the lower part of the valve block 50 through the notch 402, so that the valve opening reliability of the valve block 50 is improved.
In the present embodiment, the lower plastic 40 includes a first plastic part 420 and a second plastic part 440. The first plastic part 420 and the second plastic part 440 are independently arranged, so that the processing and forming of the first plastic part 420 and the second plastic part 440 are facilitated. In some embodiments, the first plastic part 420 and the second plastic part 440 may be integrally formed. The lower plastic panel 42 and the air moving structure 43 constitute a first plastic part 420. In the embodiment, the lower plastic plate 42 is provided with a first injection molding opening 4201, the air moving structure 43 is provided with a second injection molding opening 4301, and the extending direction of the first injection molding opening 4201 is parallel to the extending direction of the second injection molding opening 4301 and parallel to the width direction Y of the end cover assembly 20, so that the overlength of the air moving structure 43 and the lower plastic plate 42 is avoided, welding marks are caused by uneven plastic liquid delay, the injection molding of the first plastic part 420 is facilitated, the phenomenon that the first plastic part 420 generates welding marks is avoided, and the structural strength of the first plastic part 420 is improved.
The notch 402 has a dimension in the length direction X of the end cap assembly 20 of 0.3mm to 1.2mm with a third dimension d 3. Therefore, the third dimension d3 of the notch 402 is larger than 1.2mm, and the impurity particles, tab fragments and other fragments in the energy storage device 5 are easy to pass through the notch 402 and float below the anti-explosion valve plate 50, so that the valve opening reliability of the anti-explosion valve plate 50 and the safety performance of the energy storage device 5 are reduced; the third dimension d3 of the notch 402 is larger than 0.3mm, which is not beneficial to the processing and forming of the folded edge 520 and the limit rib 410, and the assembly and the positioning are difficult; the third dimension d3 of the notch 402 is 0.3mm-1.2mm, so that the broken slag such as impurity particles and tab fragments in the energy storage device 5 is prevented from drifting below the anti-explosion valve plate 50 through the notch 402, the valve opening reliability of the anti-explosion valve plate 50 and the safety performance of the energy storage device 5 are improved, and the processing, forming, assembling and positioning of the folded edge 520 and the limiting convex rib 410 are facilitated. The third dimension d3 of the notch 402 in the length direction X of the end cap assembly 20 is, but is not limited to, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0 mm, 1.1 mm, 1.2mm, or the like.
Illustratively, in the present embodiment, the walkway structure 43 includes a connection frame 44 and a shielding plate 45. The connection frame 44 is connected with the lower plastic plate 42, and the shielding plate 45 is convexly arranged on one side of the connection frame 44 away from the top cover 30. The limiting ribs 410 extend obliquely from the end of the connecting frame 44 away from the top cover 30 toward the explosion-proof hole 303. The walkway construction 43 also comprises a support plate 46. The support plate 46 is protruding on one side of the shielding plate 45 facing the top cover 30, and divides the accommodating groove 401 into a first groove body 4011 and a second groove body 4012, and the explosion-proof valve plate 50 is accommodated in the second groove body 4012. The limiting rib 410 is disposed at a position of the connection frame 44 corresponding to the second groove 4012, and is located in the second groove 4012. On the one hand, on the basis of accommodating the anti-explosion valve plate 50 in the second groove body 4012, the gas generated by the energy storage device 5 can be better gathered at the accessory position of the anti-explosion valve plate 50, so that the valve is convenient to open; on the other hand, the limiting rib 410 is disposed at the position of the connection frame 44 corresponding to the second groove 4012 and is located in the second groove 4012, so as to facilitate the processing and forming of the limiting rib 410.
The size of the orthographic projection of the connecting frame body 44 in the height direction Z of the end cover assembly 20 is a first size d1, the size of the orthographic projection of the limiting ribs 410 in the height direction Z of the end cover assembly 20 is a second size d2, and the ratio n of the second size d2 to the first size d1 is greater than or equal to 1/2 and less than or equal to 2/3. Therefore, in the process of clamping the folded edge 520 and the limiting bead 410, the limiting bead 410 deforms when the curled portion 522 is pressed, so that if the ratio of the second dimension d2 to the first dimension d1 is too large, after the limiting bead 410 and the curled portion 522 are pressed and deformed to be in clamping fit, the orthographic projection of the deformed limiting bead 410 in the height direction Z is larger than the first dimension d1, and at this time, the occupied space of the clamping of the limiting bead 410 and the folded edge 520 in the height direction Z is large, which results in insufficient compactness of the overall structure of the lower plastic 40 and small space utilization; if the ratio of the second dimension d2 to the first dimension d1 is too small, the overlapping portion of the snap fit between the limiting rib 410 and the curled portion 522 is less, the snap fit reliability is poor, and the structural stability of the lower plastic 40 is poor; according to the embodiment of the application, the ratio of the second dimension d2 to the first dimension d1 is designed to be 1/2-n-2/3, so that the limit ribs 410 and the top cover 30 are arranged at intervals, and therefore, in the process of assembling the lower plastic 40, the limit ribs 410 have enough deformation space, and the assembly efficiency and the clamping fit reliability of the lower plastic 40 and the structural stability of the lower plastic 40 are improved.
The size of the notch 402 in the length direction X of the end cover assembly 20 is a third size d3, the size of the orthographic projection of the limiting rib 410 in the height direction Z perpendicular to the end cover assembly 20 is a fourth size d4, and the ratio of the third size d3 to the fourth size d4 is s, wherein s is more than or equal to 1/2 and less than or equal to 2/3. Therefore, if the ratio of the third dimension d3 to the fourth dimension d4 is too small, the overlapping portion of the locking engagement between the limiting rib 410 and the curled portion 522 is less, the locking engagement reliability is poor, and the structural stability of the lower plastic 40 is poor; if the ratio of the third dimension d3 to the fourth dimension d4 is too large, the spacing rib 410 and the curled portion 522 will block the air passage on the side of the air passage structure 43 after being deformed to the engagement by pressing, which affects the air passage, and is inconvenient for opening the valve of the valve block 50, and affects the reliability of opening the valve of the valve block 50.
The dimension of the air passing structure 43 in the length direction X of the end cover assembly 20 is a fifth dimension d5, and the ratio of the third dimension d3 to the fifth dimension d5 is t, wherein t is more than or equal to 1/10 and less than or equal to 1/8. Therefore, if the ratio of the third dimension d3 to the fifth dimension d5 is too small, which results in too small a size of the notch 402, the air-passing effect of the air-passing structure 43 is affected, the valve opening of the anti-explosion valve plate 50 is inconvenient, the valve opening reliability of the anti-explosion valve plate 50 is affected, and in the process of clamping and matching the lower plastic 40 and the anti-explosion valve plate 50, the user cannot intuitively align the folded edge 520 and the limiting rib 410, so that the operation precision is improved, and the assembly efficiency and the production efficiency are reduced. If the ratio of the third dimension d3 to the fifth dimension d5 is too large, the size of the notch 402 is too large, and the impurity particles, tab fragments and other debris in the energy storage device 5 easily pass through the notch 402 and float below the anti-explosion valve plate, so that the valve opening reliability of the anti-explosion valve plate 50 and the safety performance of the energy storage device 5 are reduced. According to the embodiment of the application, the ratio of the third dimension d3 to the fifth dimension d5 is designed to be 1/10-1/8, so that impurity particles, tab fragments and other scraps in the energy storage device 5 are prevented from drifting below the anti-explosion valve plate 50 through the notch 402, the valve opening reliability of the anti-explosion valve plate 50 and the safety performance of the energy storage device 5 are improved, meanwhile, the assembly and positioning of the folded edge 520 and the limiting ribs 410 are facilitated, the operation precision is reduced, the operation is facilitated, and the assembly efficiency and the production efficiency are improved.
In this embodiment, the spacing bead 410 extends from the end of the connection frame 44 away from the top cover 30 toward the central axis P of the valve plate 50, so as to facilitate the processing and forming of the spacing bead 410 and save the occupied space of the spacing bead 410 in the height direction Z of the end cover assembly 20.
The distance between the end of the flange 520 facing away from the explosion-proof body 51 and the end face of the connection frame 44 facing away from the top cover 30 in the height direction Z of the end cap assembly 20 is 0mm to 0.5mm. Thus, on the one hand, the folded edge 520 is prevented from obstructing the gas generated by the energy storage device 5 from flowing into the lower part of the anti-explosion valve plate 50; on the other hand, the structural strength of the flange 520 is improved to better support the lower plastic 40 and to save the space occupied by the flange 520 in the height direction Z of the end cap assembly 20. In this embodiment, the distance between the end of the folded edge 520 facing away from the explosion-proof body 51 and the end surface of the connection frame 44 facing away from the top cover 30 is 0mm, so that the space utilization rate of the folded edge 520 is improved, and meanwhile, the folded edge 520 is prevented from blocking the gas generated by the energy storage device 5 to flow into the lower portion of the explosion-proof valve plate 50.
Referring now also to fig. 2, 4 and 7-9, fig. 9 is a partial cross-sectional view of the end cap assembly 20 of the energy storage device 5 of fig. 7 taken along line B-B. The connection frame 44 includes two corner portions 441 facing away from the lower plastic sheet 42. The two corner portions 441 are configured in a circular arc structure, and the radius of the circular arc structure is 1.5mm-2.5mm, so that the phenomenon that the structural strength of the connecting frame 44 at the corner portions 441 is reduced due to the fact that the two corner portions 441 of the connecting frame 44 hit the wall surface at an angle of 90 degrees in a high-speed flowing plastic liquid cavity during injection molding is avoided.
The shielding 45 has a U-shaped structure. The shielding plate 45 includes a bottom plate and two side plates 452, the bottom plate is connected to the side plates 452 at both ends of the end cap assembly 20 in the width direction Y, respectively, and the side plates 452 are connected between the connection frame 44 and the bottom plate. The bottom plate is provided with a plurality of ventilation holes 4511 which are arranged at intervals, so that gas generated by the energy storage device 5 flows into the lower part of the anti-explosion valve plate 50, and the valve opening reliability of the anti-explosion valve plate 50 and the safety performance of the energy storage device 5 are improved. The bottom plate is the fillet setting with the junction of two curb plates 452 to avoid when moulding plastics, the phenomenon that reduces the structural strength of shielding plate 45 cooling back corner appears in the wall vortex is impacted with 90 degrees angles in the high-speed plastic liquid chamber.
The support plate 46 is configured in a ring-like structure. The support plate 46 has a similar shape to the explosion-proof body 51, thereby improving the air-out and air-collecting efficiency of the chamber of the explosion-proof valve plate 50. The support plate 46 has a trapezoidal longitudinal section along the height direction Z of the end cap assembly 20, i.e., the thickness of the support plate 46 gradually decreases from the shielding plate 45 toward the top cap 30. Therefore, the injection mold of the support plate 46 during injection molding is a pair of trapezoid movable mold and trapezoid fixed mold, and the trapezoid movable mold and the fixed mold can be mutually and rapidly clamped without high operation precision alignment when being matched to form a runner for constructing the air passing structure 43, so that the glue overflow is avoided, and the production efficiency and the yield of products are further improved; on the other hand, the structural stability and the structural strength are improved, the contact surface between the bottom of the supporting plate 46 and the shielding plate 45 is increased, the pressure intensity born by the bottom of the corresponding supporting plate 46 when the winding core is extruded upwards is reduced, and the winding core of the energy storage device 5 is prevented from being cracked and scratched due to overlarge differential stress of the bottom of the supporting plate 46; on the other hand, the position of the annular supporting plate 46 corresponds to an injection runner during injection molding, and the wider position of the supporting plate 46 can facilitate more glue injection liquid to quickly pass through the bottom wall in the fence structure, so that the glue shortage of the bottom wall or the formation of welding marks are avoided, and the production yield and the production efficiency are improved. In addition, the annular support plate 46 can shrink the tightening film to have the convex block after injection molding and cooling, and the wedge-shaped rib section facilitates the circular arc rib to take off the film and is separated from the convex block of the die.
Referring to fig. 2, 4 and 10-12, the top cover 30 is provided with a first mounting hole 305 penetrating the first surface 301 and the second surface 302. The lower plastic 40 has a third surface 403 and a fourth surface 404 disposed opposite to each other. The lower plastic 40 is provided with a second mounting hole 405 penetrating the third surface 403 and the fourth surface 404. The end cap assembly 20 further includes a post 60 and a seal ring 70, the post 60 including a flange portion 61 and a post portion 62. The flange portion 61 is connected to one end of the column portion 62, and the column portion 62 is provided to pass through the first mounting hole 305 and the second mounting hole 405. The seal ring 70 is sleeved outside the column portion 62 and abuts against the side wall of the first mounting hole 305. On the one hand, the sealing ring 70 is arranged to avoid the problem of short circuit caused by the fact that the column part 62 of the pole 60 is in contact with the side wall of the first mounting hole 305 of the top cover 30; on the other hand, since the seal ring 70 can squeeze the column portion 62 of the pole 60, when the plastic material is injected subsequently, the seal ring 70 can avoid the rubbing phenomenon caused by the abutment of the boss portion of the column portion 62 of the pole 60, which is close to the flange portion 61, against the side wall of the first mounting hole 305 of the top cover 30, thereby reducing the occurrence probability of metal chips.
It will be appreciated that in this embodiment, the post 60 includes a positive post and a negative post, and the post portions 62 of the positive post and the negative post are each sleeved with a seal ring 70. The sealing ring 70 seals the connection post 60 with the top cover 30 and the lower plastic 40, thereby avoiding leakage of the electrolyte.
Referring to fig. 4 and 13 together, the second surface 302 is provided with a positioning portion 306, the third surface 403 is provided with a mating portion 406, one of the positioning portion 306 and the mating portion 406 is configured as a blind hole, and the other one of the positioning portion and the mating portion is configured as a protrusion, and the protrusion is accommodated in the blind hole. Therefore, on the one hand, when the top cover 30 and the lower plastic 40 are assembled, the lower plastic 40 is relatively close to the top cover 30 and protrudes into the blind hole, so that the positioning and limiting of the lower plastic 40 and the top cover 30 are realized, and the column part 62 of the pole 60 is arranged at intervals with the side wall of the first mounting hole 305 of the top cover 30, thereby avoiding the problem of short circuit caused by contact between the column part 62 of the pole 60 and the side wall of the first mounting hole 305 of the top cover 30; on the other hand, during the subsequent injection molding of plastic material, the phenomenon that the column portion 62 of the pole 60 abuts against the side wall of the first mounting hole 305 of the top cover 30 to scratch is avoided, and the occurrence probability of metal scraps is reduced.
The inner diameter of the blind hole is a first diameter and is marked as D1, the outer diameter of the protrusion is a second diameter and is marked as D2, wherein D1/D2 is more than or equal to 1.25 and less than or equal to 1.55. Illustratively, in this embodiment, the second surface 302 is provided with blind holes and the third surface 403 is provided with protrusions. For example, 2 mm.ltoreq.D1.ltoreq.4mm, and specifically, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, etc. may be mentioned. D2 is more than or equal to 1mm and less than or equal to 3mm, and can be more specifically 1mm, 1.5mm, 2mm, 2.5mm, 3mm and the like.
The end cap assembly 20 of the present embodiment satisfies D1 > D2. I.e. the inner diameter of the blind hole is larger than the outer diameter of the protrusion. Alternatively, when D1 is 2mm, D2 is 1mm; when D1 is 3mm, D2 is 2mm; d2 is 3mm when D1 is 4mm, d1—d2=1 mm. Alternatively, when D1 is 3mm, D2 is 1mm; when D1 is 4mm, D2 is 2mm and d1—d2=2mm. Of course, when D1 is 4mm, D2 may be 1mm, and D1-d2=3 mm. The inside diameter of the blind hole is larger than the outside diameter of the protrusion, so that the protrusion needs to be ensured to conveniently extend into the blind hole, if d1=d2, although the protrusion can also extend into the blind hole, the protrusion is difficult to extend into the blind hole, the operation is inconvenient, if D1 is smaller than D2, the protrusion cannot extend into the blind hole, and the positioning and limiting effects cannot be achieved.
The end cap assembly 20 also satisfies: D1/D2 is less than or equal to 1.25 and less than or equal to 1.55. Specifically, D1/D2 may be 1.25, 1.3, 1.35, 1.5, 1.55, etc. The proportion of the inner diameter of the blind hole and the outer diameter of the protrusion are reasonable, the protrusion moves in the blind hole, so that the position between the top cover 30 and the lower plastic 40 can be finely adjusted in a relatively sliding mode, the installation of the subsequent pole 60 and the like can be better facilitated, and meanwhile, the relatively sliding range of the top cover 30 and the lower plastic 40 is not too large, so that the positioning and limiting effects are poor. If D1/D2 is less than 1.25, the inner diameter of the blind hole and the outer diameter of the protrusion are too close, and the movable range of the protrusion in the blind hole is too small, which easily causes interference when the post 60 is subsequently mounted and cannot be mounted. If D1/D2 is larger than 1.55, the difference between the inner diameter of the blind hole and the outer diameter of the protrusion is too large, and the protrusion can move in the blind hole too much, so that the positioning and limiting effects are poor.
Optionally, the number of the positioning portions and the number of the matching portions are multiple, and the positioning portions and the matching portions are in one-to-one correspondence. In other words, the number of the blind holes and the protrusions is plural, and the blind holes and the protrusions are in one-to-one correspondence. The specific number of blind holes and protrusions is not limited, and may be 2, 3, 4, … …, etc. By providing a plurality of blind holes and a plurality of protrusions, positioning and limiting can be performed at a plurality of positions, which is beneficial to improving the accuracy of mounting the top cover 30 and the lower plastic 40.
In a specific embodiment, two mating portions 406 are spaced apart from the lower plastic 40 in the width direction Y of the end cap assembly 20, and the second mounting hole 405 is located between the two mating portions 406. Specifically, in the width direction Y of the end cap assembly 20, two sides of the second mounting hole 405 of the first plastic member 420 are respectively provided with a protrusion, and two sides of the second mounting hole 405 of the second plastic member 440 are respectively provided with a protrusion. Therefore, the number of the protrusions on the first plastic part 420 and the second plastic part 440 is 2, so that the positioning and limiting functions can be realized, the excessive assembly difficulty is not increased, the plastic materials are reduced, and the cost is low. Optionally, the two mating portions are symmetrically disposed about a centerline of the end cap assembly 20 in the length direction X, thereby further enhancing positioning and limiting functions.
In the present embodiment, the fourth surface 404 of the lower plastic 40 is provided with a first positioning groove 407 for accommodating the flange 61. A positioning boss 408 is protruding from the third surface 403 of the lower plastic 40 at a position corresponding to the first positioning slot 407. The second surface 302 of the top cover 30 is provided with a second positioning groove 307 for accommodating the positioning boss 408, so that the limiting and positioning of the top cover 30 and the lower plastic 40 are realized, and the assembly efficiency and the assembly yield are improved.
Referring again to fig. 11 and 12, the surface of the flange portion 61 provided with the cylindrical portion 62 is a first step surface 611, and the outer peripheral surface of the cylindrical portion 62 is provided with an annular groove 621 to form a second step surface 622 near the flange portion 61 side, the second step surface 622 being located between the first surface 301 and the second surface 302. The end cap assembly 20 further includes an upper plastic 80, wherein the upper plastic 80 is sleeved on the column portion 62 and abuts against the first surface 301, and the upper plastic 80 further extends into the annular groove 621 and abuts against the second step surface 622. Therefore, by arranging the annular groove 621, the upper plastic 80 can be tightly fixed on the top cover 30 without being separated, the upper plastic 80 plays a role in insulation protection, so that the column portion 62 of the pole 60 is only exposed from the end surface of the flange portion 61, and the other peripheries extending out of the top cover 30 are surrounded by the upper plastic 80, thereby avoiding accidental electric shock.
The seal ring 70 includes a first end face 701 and a second end face 702 along the axial direction of the column portion 62, the first end face 701 abuts against the first step face 611, and the second end face 702 abuts against the upper plastic 80, so that the upper plastic 80 can play a role in fixing the seal ring 70, so that the seal ring 70 is structurally stable, ensuring that the column portion 62 of the pole 60 is completely separated from the top cover 30, and avoiding a short circuit.
The protrusion height of the junction of the inner peripheral wall 703 and the second end surface 702 of the seal ring 70, which is opposite to the junction of the outer peripheral wall 704 and the second end surface 702 of the seal ring 70, toward the side facing away from the flange 61 is a third height, denoted as H3, and satisfies 0.05 mm.ltoreq.H2.ltoreq.0.55 mm. On the one hand, the inner peripheral wall 703 of the seal ring 70 is higher than the outer peripheral wall 704 of the seal ring 70, thereby blocking the cylindrical portion 62 of the pole 60 from contacting the wall of the first mounting hole 305 of the top cover 30, and preventing short circuit; on the other hand, 0.05mm < H3 > is satisfied and 0.55mm is satisfied, the interval between the column part 62 and the side wall of the first mounting hole 305 is reasonable, so that the sealing ring 70 can penetrate between the column part 62 and the side wall of the first mounting hole 305, and the sealing ring 70 can apply enough abutting force to the column part 62 and the side wall of the first mounting hole 305, thereby realizing stable fixation. If H3 is smaller than 0.05mm, the distance between the cylindrical portion 62 and the side wall of the first mounting hole 305 is too large, and the sufficient abutment force applied to the cylindrical portion and the side wall of the first mounting hole 305 by the seal ring 70 is insufficient, resulting in poor fixing effect and easy loosening. If H3 is greater than 0.55mm, the distance between the cylindrical portion 62 and the side wall of the first mounting hole 305 is too small, and the tension of the seal ring 70 itself is too large, so that the seal ring is liable to collapse.
The foregoing has outlined rather broadly the more detailed description of embodiments of the application, wherein the principles and embodiments of the application are explained in detail using specific examples, the above examples being provided solely to facilitate the understanding of the method and core concepts of the application; meanwhile, as those skilled in the art will appreciate, modifications will be made in the specific embodiments and application scope in accordance with the idea of the present application, and the present disclosure should not be construed as limiting the present application.
Claims (22)
1. An end cap assembly, comprising:
the top cover is provided with a first surface and a second surface which are arranged in opposite directions, and the top cover is provided with explosion-proof holes penetrating through the first surface and the second surface;
the explosion-proof valve block is arranged at the explosion-proof hole and comprises an explosion-proof body and a turnover structure, the explosion-proof body seals the explosion-proof hole and is fixed on the top cover, and the turnover structure extends from the circumferential edge of the explosion-proof body towards the direction deviating from the top cover;
and the position of the lower plastic corresponding to the turnover structure is provided with a limiting structure, and the limiting structure is clamped with the turnover structure.
2. The end cap assembly of claim 1, wherein the turnover structure is configured as two folds oppositely disposed along a length direction of the end cap assembly, and the limit structure is configured as two limit ribs disposed in one-to-one correspondence with the two folds.
3. The end cap assembly of claim 2, wherein the flange includes an extension and a crimp, the extension being connected between the explosion proof body and the crimp, the crimp pressing against the spacing bead in a height direction of the end cap assembly.
4. The end cap assembly of claim 3, wherein the extension portion extends in a direction that forms a first included angle, denoted α, with the plane of the explosion-proof body, the opening facing away from the spacing bead, the first included angle being an obtuse angle.
5. The end cap assembly of claim 4, wherein the first included angle is 110 ° -150 °.
6. The end cap assembly of claim 4, wherein the direction of extension of the spacing bead forms a second angle with the plane of the lower plastic that opens away from the flange, denoted as β, and the direction of extension of the spacing bead forms a third angle with the central axis of the blast gate sheet that opens toward the top cap, denoted as γ, wherein 5 ° - β|is +.ltoreq.10 °, β+γ=180°.
7. The end cap assembly of claim 5, wherein the extension has a first height in a height direction of the end cap assembly, the crimp has a second height in a height direction of the end cap assembly, and a ratio of the second height to the first height is m, wherein 1/3.ltoreq.m.ltoreq.1/2.
8. The end cap assembly of any one of claims 3-7, wherein an end of the extension distal from the vent body curls from a direction away from the central axis of the vent panel toward a direction toward the central axis of the vent panel to form the curled portion.
9. The end cap assembly of any one of claims 2-7, wherein the spacing rib is configured as an elastic structure, the lower plastic comprises a lower plastic plate and an air-passing structure arranged at the end part of the lower plastic plate, which is close to the explosion-proof valve plate, the air-passing structure comprises a connecting frame body and a shielding plate, the connecting frame body is connected with the lower plastic plate, the shielding plate is convexly arranged at one side of the connecting frame body, which is away from the top cap, and the spacing rib is obliquely arranged from the end part of the connecting frame body, which is away from the top cap, towards the explosion-proof hole.
10. The end cap assembly of claim 9, wherein the dimension of the orthographic projection of the connecting frame body in the height direction of the end cap assembly is a first dimension, the dimension of the orthographic projection of the limit rib in the height direction of the end cap assembly is a second dimension, and the ratio n of the second dimension to the first dimension is 1/2.ltoreq.n.ltoreq.2/3.
11. The end cap assembly of any one of claims 2-7, wherein the spacing bead overlaps an orthographic projection of the flange in a projection plane perpendicular to a height direction of the end cap assembly.
12. The end cap assembly of claim 9, wherein the air-moving structure forms a notch towards the accommodating groove of the top cap, the anti-explosion valve plate is accommodated in the accommodating groove, two sides of one side, away from the top cap, of the air-moving structure along the length direction of the end cap assembly are respectively provided with a notch communicated with the accommodating groove, and the notch exposes the folded edge and the limiting ribs.
13. The end cap assembly of claim 12, wherein the notch has a third dimension along the length of the end cap assembly, the spacing bead has a fourth dimension along an orthographic projection of the spacing bead perpendicular to the height of the end cap assembly, and a ratio of the third dimension to the fourth dimension is s, wherein 1/2.ltoreq.s.ltoreq.2/3.
14. The end cap assembly of claim 12, wherein the gap has a third dimension along the length of the end cap assembly, the gassing structure has a fifth dimension along the length of the end cap assembly, and a ratio of the third dimension to the fifth dimension is t, wherein 1/10 < t < 1/8.
15. The end cap assembly of claim 12, wherein the gas-moving structure further comprises a support plate, the support plate is protruding on one side of the shielding plate facing the top cap and divides the accommodating groove into a first groove body and a second groove body, the anti-explosion valve plate is accommodated in the second groove body, and the limiting protruding rib is arranged at a position of the connecting frame body corresponding to the second groove body and is positioned in the second groove body.
16. The end cap assembly of claim 1, wherein the top cap defines a first mounting hole extending through the first surface and the second surface, the lower plastic has a third surface and a fourth surface disposed opposite to each other, the lower plastic defines a second mounting hole extending through the third surface and the fourth surface, the end cap assembly further comprises a post and a seal ring, the post comprises a flange portion and a cylindrical portion, the flange portion is connected to one end of the cylindrical portion, the cylindrical portion is disposed through the first mounting hole and the second mounting hole, and the seal ring is disposed outside the cylindrical portion and is in abutment with a sidewall of the first mounting hole.
17. The end cap assembly of claim 16, wherein the second surface is provided with a locating portion and the third surface is provided with a mating portion, one of the locating portion and the mating portion being configured as a blind hole and the other of the locating portion and the mating portion being configured as a protrusion, the protrusion being received within the blind hole.
18. The end cap assembly of claim 16, wherein the surface of the flange portion provided with the cylindrical portion is a first stepped surface, and the outer peripheral surface of the cylindrical portion is provided with an annular groove to form a second stepped surface adjacent to one side of the flange portion, the second stepped surface being located between the first surface and the second surface; the end cover assembly further comprises upper plastic, the upper plastic is sleeved on the column body and is abutted to the first surface, and the upper plastic further stretches into the annular groove and is abutted to the second step surface.
19. The end cap assembly of claim 18, wherein the seal ring includes a first end face and a second end face along an axial direction of the cylindrical portion, the first end face abutting the first step face, the second end face abutting the upper plastic.
20. The end cap assembly of claim 19, wherein the junction of the inner peripheral wall of the seal ring and the second end face is raised to a third height, denoted H3, of 0.05mm ∈h3 ∈0.55mm, relative to the junction of the outer peripheral wall of the seal ring and the second end face toward the side facing away from the flange portion.
21. An energy storage device comprising an end cap assembly according to any one of claims 1 to 20.
22. A powered device comprising the energy storage device of claim 21, the energy storage device providing electrical energy to the powered device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311032236.9A CN116799388B (en) | 2023-08-16 | 2023-08-16 | End cover assembly, energy storage device and electric equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311032236.9A CN116799388B (en) | 2023-08-16 | 2023-08-16 | End cover assembly, energy storage device and electric equipment |
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| CN116799388A true CN116799388A (en) | 2023-09-22 |
| CN116799388B CN116799388B (en) | 2023-12-22 |
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| CN202311032236.9A Active CN116799388B (en) | 2023-08-16 | 2023-08-16 | End cover assembly, energy storage device and electric equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117525743A (en) * | 2024-01-08 | 2024-02-06 | 深圳海辰储能科技有限公司 | End cover assembly, energy storage device and electric equipment |
| CN117855698A (en) * | 2024-03-07 | 2024-04-09 | 蜂巢能源科技股份有限公司 | Shell assembly and battery |
| CN117855708A (en) * | 2024-03-05 | 2024-04-09 | 厦门海辰储能科技股份有限公司 | End cover assembly, energy storage device and electric equipment |
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|---|---|
| CN116799388B (en) | 2023-12-22 |
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Address after: Room 501, R&D Building, No. 2 Sany Yundu, No. 6 Lanqing Second Road, Luhu Community, Guanhu Street, Longhua District, Shenzhen City, Guangdong Province, 518110 Patentee after: Shenzhen Haichen Energy Storage Technology Co.,Ltd. Country or region after: China Patentee after: Xiamen Haichen Energy Storage Technology Co.,Ltd. Address before: Room 501, R&D Building, No. 2 Sany Yundu, No. 6 Lanqing Second Road, Luhu Community, Guanhu Street, Longhua District, Shenzhen City, Guangdong Province, 518110 Patentee before: Shenzhen Haichen Energy Storage Control Technology Co.,Ltd. Country or region before: China Patentee before: Xiamen Haichen Energy Storage Technology Co.,Ltd. |