CN116557596B - Explosion-proof valve, end cover assembly, battery and energy storage device - Google Patents
Explosion-proof valve, end cover assembly, battery and energy storage device Download PDFInfo
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- CN116557596B CN116557596B CN202310851843.1A CN202310851843A CN116557596B CN 116557596 B CN116557596 B CN 116557596B CN 202310851843 A CN202310851843 A CN 202310851843A CN 116557596 B CN116557596 B CN 116557596B
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- 238000004146 energy storage Methods 0.000 title claims abstract description 17
- 238000005422 blasting Methods 0.000 claims abstract description 85
- 230000003014 reinforcing effect Effects 0.000 claims description 80
- 230000007704 transition Effects 0.000 claims description 73
- 238000004880 explosion Methods 0.000 claims description 50
- 238000000034 method Methods 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 11
- 230000002829 reductive effect Effects 0.000 claims description 9
- 238000003466 welding Methods 0.000 abstract description 31
- 239000007789 gas Substances 0.000 description 35
- 238000005728 strengthening Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 8
- 230000002787 reinforcement Effects 0.000 description 8
- 230000035945 sensitivity Effects 0.000 description 8
- 230000009471 action Effects 0.000 description 6
- 230000002093 peripheral effect Effects 0.000 description 6
- 239000011324 bead Substances 0.000 description 4
- 230000009172 bursting Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000670 limiting effect Effects 0.000 description 4
- 229910001416 lithium ion Inorganic materials 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 1
- JDZCKJOXGCMJGS-UHFFFAOYSA-N [Li].[S] Chemical compound [Li].[S] JDZCKJOXGCMJGS-UHFFFAOYSA-N 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- VVNXEADCOVSAER-UHFFFAOYSA-N lithium sodium Chemical compound [Li].[Na] VVNXEADCOVSAER-UHFFFAOYSA-N 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000011218 segmentation Effects 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/14—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member
- F16K17/16—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side with fracturing member with fracturing diaphragm ; Rupture discs
-
- 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
- H01M50/342—Non-re-sealable arrangements
- H01M50/3425—Non-re-sealable arrangements in the form of rupturable membranes or weakened parts, e.g. pierced with the aid of a sharp member
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Gas Exhaust Devices For Batteries (AREA)
Abstract
The application provides an explosion-proof valve, an end cover assembly, a battery and an energy storage device. The explosion-proof valve includes: the explosion-proof body and connecting portion, connecting portion are connected to the periphery of explosion-proof body, the explosion-proof body is equipped with the weak portion, the thickness of weak portion is less than the thickness of explosion-proof body, the weak portion includes blasting section, first changeover portion, second changeover portion and linkage segment, the blasting section is relative and the interval setting with the linkage segment, the one end at the blasting section is connected with the one end of linkage segment to first changeover portion, the other end at the blasting section and the other end of linkage segment are connected to the second changeover portion, the thickness of blasting section is less than the thickness of first changeover portion and second changeover portion, the thickness of first changeover portion and second changeover portion is less than the thickness of linkage segment. The explosion-proof valve provided by the application can solve the technical problems that the integral weak part of the explosion-proof valve is influenced by welding energy to generate shrinkage deformation and even fuse with higher probability, so that the explosion-proof valve is invalid, and the safety performance and the use reliability of a battery are greatly influenced.
Description
Technical Field
The application relates to the technical field of batteries, in particular to an explosion-proof valve, an end cover assembly, a battery and an energy storage device.
Background
The chargeable and dischargeable battery has the advantages of high energy density, high power density, multiple recycling times, long storage time and the like, and has wide application in the fields of electric automobiles, mobile equipment and the like.
The explosion-proof valve is an important pressure relief structural member of the battery end cover assembly. The explosion-proof valve is usually provided with a weak part, when the internal air pressure of the battery exceeds a threshold value, the explosion-proof valve can be broken from the weak part, and the air is discharged in time, so that the explosion of the battery is avoided. The whole weak portion of the existing explosion-proof valve is affected by welding energy, so that the probability of shrinkage deformation and even fusing is high, the explosion-proof valve is invalid, and the safety performance and the use reliability of the battery are greatly affected.
Disclosure of Invention
The application provides an explosion-proof valve, an end cover assembly, a battery and an energy storage device, which are used for solving the technical problems that in the prior art, the integral weak part of the explosion-proof valve is influenced by welding energy to generate shrinkage deformation and even fuse with higher probability, so that the explosion-proof valve fails, and the safety performance and the use reliability of the battery are greatly influenced.
To solve the above problems, in a first aspect, the present application provides an explosion-proof valve comprising: the explosion-proof body and connecting portion, connecting portion are connected to the periphery of explosion-proof body, the explosion-proof body is equipped with the weak portion, the thickness of weak portion is less than the thickness of explosion-proof body, the weak portion includes blasting section, first changeover portion, second changeover portion and linkage segment, the blasting section is relative and the interval setting with the linkage segment, the one end at the blasting section is connected with the one end of linkage segment to first changeover portion, the other end at the blasting section and the other end of linkage segment are connected to the second changeover portion, the thickness of blasting section is less than the thickness of first changeover portion and second changeover portion, the thickness of first changeover portion and second changeover portion is less than the thickness of linkage segment.
It can be appreciated that, by setting the thickness of the connecting section to be the largest and the thickness of the bursting section to be the smallest, the thickness of the first transition section and the thickness of the second transition section are between the thickness of the connecting section and the thickness of the bursting section, the weak portion of the explosion-proof valve according to the embodiment of the present application has various thicknesses compared to the explosion-proof valve of the prior art. Through setting up the weak portion and having multiple thickness, reduce the length ratio of blasting section, can effectively reduce the probability that the thinnest blasting section takes place shrinkage deformation and even fuses by the influence of welding energy. Meanwhile, through setting the minimum thickness of blasting section, can guarantee when the inside certain pressure threshold value that reaches of battery, the gas in the battery can be broken by the washing of thinnest blasting section, in time exhaust gas, avoid the battery explosion, guarantee the sensitivity of explosion-proof valve opening. Through setting up the thickness of first changeover portion and the thickness of second changeover portion between the thickness of linkage segment and the thickness of blasting section, receive certain gas pressure after breaking when the blasting section, the explosion-proof body periphery of broken crack can continue to break along the track of blasting section and the track that extends to first changeover portion and second changeover portion, guarantees that the opening of explosion-proof valve reaches certain opening size in the short time and in time discharges gas, guarantees the timeliness of explosion-proof valve opening. Through setting up the linkage segment on the weak portion, the thickness of linkage segment is less than the thickness of explosion-proof body, and when pressure is less, the linkage segment can provide the effect of turning over the direction for the weak portion that the linkage segment was located, guarantees the pressure release area of explosion-proof valve. Through setting up the thickness of linkage segment biggest, the thickness of blasting section is minimum, and the thickness of first changeover portion and the thickness of second changeover portion are between the thickness of linkage segment and the thickness of blasting section, both can make the explosion-proof body form the blast gate of exhaust gas in the weak portion, but be unlikely to break away from the emergence of explosion-proof valve causing the phenomenon of splashing completely, guarantee the security performance and the reliability of use of battery.
In one possible embodiment, the ratio K1 of the length of the blasting section at the circumference of the weak portion is 15% or less and K1 is or less than 45%, the ratio K2 of the length of the connecting section at the circumference of the weak portion is 10% or less and K2 is or less than 45%, and the ratio of the length of the blasting section at the circumference of the weak portion is greater than or equal to the ratio of the length of the connecting section at the circumference of the weak portion.
It can be understood that by setting the length of the blasting section to be 15% or less than K1 or less than 45% of the perimeter L of the weak portion, the length of the connecting section to be 10% or less than K2 or less than 45% of the perimeter L of the weak portion, and the length of the blasting section to be greater than or equal to the length of the connecting section, the valve opening of the explosion-proof valve can be realized while the probability that the thinnest blasting section is affected by welding energy to shrink, deform or even fuse is reduced, so that the valve opening of the explosion-proof valve can be realized in a certain opening size in a short time, gas is discharged in time, the valve opening timeliness of the explosion-proof valve is ensured, and the safety performance and the use reliability of the battery are improved.
In a possible implementation manner, the explosion-proof body comprises a first surface and a second surface which are oppositely arranged, the explosion-proof body is further provided with reinforcing ribs, the reinforcing ribs are arranged around the periphery of the weak part at intervals and between the weak part and the connecting part, the reinforcing ribs are arranged in a protruding mode from the first surface in a direction away from the second surface along the thickness direction of the explosion-proof body, and the reinforcing ribs are formed by stamping the explosion-proof body through a stamping process.
It can be understood that by arranging the reinforcing ribs, the structural strength of the explosion-proof body can be enhanced, and the explosion-proof body is not easy to deform in the process of assembly or use, so that the use reliability of the explosion-proof valve is ensured. Through setting up the strengthening rib between weak portion and connecting portion and from the first surface of explosion-proof body to the direction protrusion setting of deviating from the second surface of explosion-proof body, can play certain separation effect to the welding heat when connecting portion welds, reduce the welding heat and carry out heat transfer from connecting portion to weak portion, further reduce the weak portion and especially the thinnest blasting section and receive the influence of welding energy to take place shrink deformation and fuse probability even to guarantee the validity and the reliability of use of explosion-proof valve better, and then guarantee the security performance of battery.
In a possible embodiment, the explosion-proof body is further provided with a connecting rib, one end of the connecting rib is connected with the reinforcing rib, the other end portion of the connecting rib is connected with the weak portion, at least part of the connecting rib is arranged in a protruding mode relative to the first surface, the protruding height of the connecting rib relative to the first surface is gradually reduced along the direction of the reinforcing rib towards the weak portion.
It will be appreciated that by adding a connecting rib between the reinforcing rib and the weakening, the structural support strength of the reinforcing rib to the weakening can be further increased. Through setting up along the direction of strengthening rib towards the weak portion, the bump height of connecting rib for the first surface reduces gradually, and the connecting rib can play with the similar structure reinforcing effect of strengthening rib, but the structure reinforcing degree of the different positions of connecting rib is different. The structural reinforcement of the connecting rib gradually weakens along the direction of the reinforcing rib towards the weak part. The connecting rib and the weak portion connecting position are not protruded relative to the first surface, the connecting rib basically has no structural reinforcement effect at the connecting position, and the weak portion can be ensured to normally open the valve. The connection part of the connecting rib and the reinforcing rib is the largest in protruding height relative to the first surface, and the structure of the connecting rib is the strongest in reinforcing effect. The structural reinforcement of the connecting rib is gradually enhanced along the weak portion toward the reinforcing rib. When the air pressure in the battery is large, the explosion-proof body is lifted and turned over under the action of the air pressure at the part which is positioned between the reinforcing rib and the weak part and provided with the connecting rib, but the explosion-proof body is not separated from the reinforcing rib, so that the explosion-proof valve is prevented from splashing, and the valve opening area of the explosion-proof valve and the safety performance of the battery are further ensured.
In one possible embodiment, the connecting rib comprises a first connecting rib, one end of the first connecting rib is connected with the reinforcing rib, and the other end part of the connecting rib is connected with the connecting section.
It can be understood that through setting up first connecting rib between strengthening rib and linkage segment, can further guarantee the joint strength of linkage segment, because the linkage segment sets up and joint strength is stronger with blasting segment relatively, when the gas in the battery reaches certain pressure, the preferential blasting segment that is thinner and joint strength weaker of follow thickness breaks, guarantees the sensitivity of battery valve opening. When the air pressure in the battery is large, the part of the connecting section is connected with the reinforcing rib through the connecting rib, so that the whole flying-out of the connecting section can be avoided when the part of the explosion-proof body enclosed by the weak part breaks through under the action of the air pressure, the explosion-proof valve is further prevented from splashing, and the effectiveness of the explosion-proof valve and the safety performance of the battery are better ensured.
In a possible embodiment, the connecting rib further includes a plurality of second connecting ribs, the plurality of second connecting ribs are arranged at intervals along the circumferential direction of the weak portion, one end of each second connecting rib is connected with the reinforcing rib, and the other end portion of each connecting rib is connected with the first transition section or the second transition section.
It can be appreciated that by providing the second connecting rib between the reinforcing rib and the first transition section or between the reinforcing rib and the second transition section, the explosion-proof body portion between the reinforcing rib and the weak portion can be restrained from being deformed by the acting force in the forming process of the reinforcing rib or the weak portion, thereby affecting the explosion pressure value of the explosion-proof valve, and further improving the structural strength of the explosion-proof body portion between the reinforcing rib and the weak portion.
In a possible implementation manner, the inner side surface of the reinforcing rib and the explosion-proof body form a valve opening area, the weak part, the first connecting rib and the second connecting rib are positioned in the valve opening area, and the area S1 of the valve opening area occupies the total area S of the explosion-proof valve in a proportion range of: S1/S is more than or equal to 40% and less than or equal to 80%.
As can be appreciated, the proportion of the area S1 of the valve opening area to the total area S of the explosion-proof valve is as follows: on one hand, the valve opening area of the explosion-proof valve can be ensured, the gas in the battery can be timely discharged in a short time by the explosion-proof valve, the valve opening timeliness of the explosion-proof valve is ensured, and the safety performance and the use reliability of the battery are further ensured; on the other hand, provide certain welding area for the connecting portion of explosion-proof valve and guarantee welding convenience and weld strength, also provide certain interval between connecting portion and the strengthening rib, reduce the weak portion that is located strengthening rib and deviate from connecting portion one side and receive the influence of welding energy to take place shrink deformation even the probability of fusing, guarantee the structural strength and the reliability of use of explosion-proof valve, and then guarantee the security performance of battery.
In one possible embodiment, the ratio of the thickness D1 of the connecting section to the thickness D1 of the explosion-proof body is in the range of: D1/D1 is more than or equal to 40% and less than or equal to 70%; the thickness of the first transition section is equal to that of the second transition section, and the proportion range of the thickness d2 of the second transition section to the thickness d1 of the connecting section is as follows: d2/d1 is more than or equal to 70% and less than or equal to 90%; the ratio of the thickness d3 of the blasting section to the thickness d1 of the connecting section is as follows: d2/d1 is more than or equal to 60% and less than or equal to 90%.
It can be understood that the ratio of the thickness D1 of the connecting section to the thickness D1 of the explosion-proof body is as follows: the thickness of the thickest connecting section in the weak part is also smaller than the thickness of the explosion-proof body and is more than or equal to 40 percent and less than or equal to 70 percent, when the battery reaches a certain pressure, the explosion-proof body can be blasted from the weak part preferentially, meanwhile, the connection effect of the connecting section and the explosion-proof body part on the inner side surface of the weak part is ensured, and the explosion-proof body part on the inner side surface of the weak part is ensured not to be separated from the explosion-proof valve completely under larger air pressure so as to cause the splashing phenomenon, thereby better ensuring the safety performance and the use reliability of the battery. Through setting up the thickness of first changeover portion equal to the thickness of second changeover portion, the thickness d2 of second changeover portion accounts for the proportional range of thickness d1 of linkage segment: the d2/d1 is more than or equal to 70% and less than or equal to 90%, after the explosion section is broken by certain gas pressure, the outer periphery of the explosion-proof body of the breaking opening can be further broken along the track of the explosion section and the track extending to the first transition section and the second transition section, so that the opening of the explosion-proof valve can be better ensured to reach a certain opening size in a short time and timely discharge the gas, and the timeliness of opening the explosion-proof valve is ensured. The ratio range of the thickness d3 of the blasting section to the thickness d1 of the connecting section is as follows: the d2/d1 is more than or equal to 60% and less than or equal to 90%, so that when the inside of the battery reaches a certain pressure threshold, gas in the battery can be flushed out and broken by the thinnest explosion section, and the gas is discharged in time, so that the explosion of the battery is avoided, and the valve opening sensitivity of the explosion-proof valve is better ensured.
In a second aspect, the application provides an end cover assembly, which comprises an end cover and the explosion-proof valve, wherein the end cover comprises an end cover body and an explosion-proof through hole, the explosion-proof through hole penetrates through the end cover body along the thickness direction of the end cover body, and the connecting part is positioned in the explosion-proof through hole and is connected with the hole wall of the explosion-proof through hole.
In a third aspect, the application provides a battery, which comprises a shell, a battery cell and an end cover assembly provided by the embodiment of the application, wherein the battery cell is arranged in the shell, the end cover assembly is matched with the shell to seal the battery cell, and the end cover assembly is electrically connected with the battery cell.
In a fourth aspect, the present application provides an energy storage device, including a housing and a plurality of batteries provided by embodiments of the present application, where the plurality of batteries provided by embodiments of the present application are electrically connected, and a point electrical connection manner of the plurality of batteries provided by embodiments of the present application includes at least one of series connection and parallel connection.
Drawings
In order to more clearly describe the embodiments of the present application or the technical solutions in the background art, the following description will describe the drawings that are required to be used in the embodiments of the present application or the background art.
FIG. 1 is a schematic structural view of an explosion-proof valve according to an embodiment of the present application;
FIG. 2 is a schematic top view of the explosion valve of FIG. 1;
FIG. 3 is a schematic cross-sectional view of the explosion valve of FIG. 2 taken along the direction B-B;
FIG. 4 is a schematic cross-sectional view of the explosion valve of FIG. 1 taken along the direction A-A;
FIG. 5 is another cross-sectional schematic view of the explosion valve of FIG. 2 taken along the direction B-B;
FIG. 6 is a schematic structural view of another explosion-proof valve provided by an embodiment of the present application;
FIG. 7 is a schematic cross-sectional view of the explosion valve of FIG. 6 taken along the direction C-C;
FIG. 8 is a schematic structural view of an end cap assembly provided in an embodiment of the present application;
FIG. 9 is an exploded schematic view of the end cap assembly of FIG. 8;
fig. 10 is a schematic view of a battery according to an embodiment of the present application;
FIG. 11 is an exploded view of the battery shown in FIG. 10;
fig. 12 is a schematic structural diagram of an energy storage device according to an embodiment of the present application.
Reference numerals:
the explosion-proof valve 10 is provided with a valve,
the explosion-proof body 11, the first surface 11a, the second surface 11b,
the connecting portion 12, the first rounded corner 121, the second rounded corner 122,
weak portion 13, explosion segment 131, explosion side wall 131a, explosion bottom wall 131b, first transition segment 132, connecting segment 133, second transition segment 134,
the reinforcing bars (14),
the connecting ribs 15, the first connecting ribs 151, the second connecting ribs 152,
the valve opening area 16 is provided with a valve opening,
the end cap assembly 100,
an end cap 20, an end cap body 21, an explosion-proof through hole 22, a protection sheet 23,
Battery 200, cell 110, housing 120, switch 130, protective film 140,
energy storage device 300, housing 310.
Detailed Description
In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, 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.
For convenience of understanding, terms involved in the embodiments of the present application will be explained first. And/or: merely one association relationship describing the associated object, the representation may have three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. A plurality of: refers to two or more. And (3) connection: it is to be understood in a broad sense that, for example, a is linked to B either directly or indirectly via an intermediary.
The embodiment of the application provides an explosion-proof valve, which is used in an end cover assembly of a battery. The battery comprises an end cover assembly and a battery cell, wherein the end cover assembly is electrically connected with the battery cell to lead out the anode and the cathode of the battery. When the battery is a single battery, the battery can be a square single battery. The battery can be further applied to an energy storage device, and the energy storage device can include, but is not limited to, a battery module, a battery pack, a battery system and the like.
The following description of the embodiments of the present application will be made with reference to the accompanying drawings.
Referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of an explosion-proof valve 10 according to an embodiment of the present application, and fig. 2 is a schematic plan view of the explosion-proof valve 10 shown in fig. 1.
The explosion-proof valve 10 includes an explosion-proof body 11 and a connecting portion 12. The connection portion 12 is connected to the outer periphery of the explosion-proof body 11, that is, the connection portion 12 is disposed around the explosion-proof body 11 and connected with the outer side surface of the explosion-proof body 11.
The explosion-proof body 11 has a substantially rectangular plate-like structure, and the explosion-proof body 11 includes a first surface 11a and a second surface 11b disposed opposite to each other. The explosion-proof body 11 is provided with a weak portion 13, a reinforcing rib 14 and a connecting rib 15. The reinforcing ribs 14 are arranged around and spaced from the periphery of the weak portion 13 and between the weak portion 13 and the connecting portion 12, the connecting ribs 15 are arranged between the weak portion 13 and the reinforcing ribs 14, one ends of the connecting ribs 15 are connected with the reinforcing ribs 14, and the other ends of the connecting ribs 15 are connected with the weak portion 13.
The weak portion 13 is in an annular runway-shaped structure, and along the thickness direction of the explosion-proof body 11, the weak portion 13 is formed by recessing the first surface 11a of the explosion-proof body 11 toward the second surface 11b of the explosion-proof body 11, for example, the weak portion 13 can be obtained by a grooving process or a stamping process. The thickness of the weakened portion 13 is smaller than the thickness of the explosion-proof body 11. The weak portion 13 includes blasting section 131, first changeover portion 132, linkage segment 133 and second changeover portion 134, and blasting section 131 and linkage segment 133 are relative and the interval sets up, and first changeover portion 132 is connected in the one end of blasting section and the one end of linkage segment 133, and the other end at blasting section and the other end of linkage segment 133 are connected to second changeover portion 134.
The ratio K1 of the length L1 of the blasting segment 131 at the circumference L of the weak portion 13 is 15% or more and 45% or less, the ratio K2 of the length of the connecting segment 133 at the circumference of the weak portion is 10% or more and 45% or less, and the ratio of the length L1 of the blasting segment 131 at the circumference L of the weak portion 13 is greater than or equal to the ratio of the length L2 of the connecting segment 133 at the circumference L of the weak portion 13, that is, L1/L is equal to or greater than L2/L, that is, the length L1 of the blasting segment 131 is greater than or equal to the length L2 of the connecting segment 133. Preferably, the ratio of the length L1 of the burst segment 131 at the perimeter L of the frangible portion 13 is greater than the ratio of the length L2 of the connecting segment 133 at the perimeter L of the frangible portion 13, i.e., L1/L > L2/L. By setting the length L1 of the blasting section 131 to be 15% or more and less than or equal to K1 and 45% or less of the perimeter L of the weak portion 13, the length of the connecting section 133 to be 10% or less and less than or equal to K2 and the length L1 of the blasting section 131 to be greater than or equal to the length L2 of the connecting section 133, the length of the blasting section 131 can be ensured to realize the valve opening of the explosion-proof valve 10 while the probability that the thinnest blasting section 131 is subjected to shrinkage deformation or even fusing under the influence of welding energy is reduced, so that the valve opening of the explosion-proof valve 10 can reach a certain opening size in a short time and timely discharge of gas, the valve opening timeliness of the explosion-proof valve 10 is ensured, and the safety performance and the use reliability of a battery are improved.
In some embodiments, the outer periphery of the frangible portion 13 includes a plurality of straight segments and a plurality of circular arc segments. The connecting segment 133 is a distinct straight segment (also allowed to include a slight arc segment) opposite and spaced from the blasting segment 131, and the length L1 of the blasting segment 131 is greater than the length L2 of the connecting segment 133. The first transition section 132 includes an arc section and a straight section extending toward the connection section 133, and the second transition section 134 includes an arc section and a straight section extending toward the connection section 133. Compared with the arrangement of the explosion-proof section 131 in the circular arc section, on the one hand, the welding heat of the connecting part 12 at the periphery of the explosion-proof body 11 corresponding to the straight line section is lower than the welding heat of the connecting part 12 at the periphery of the explosion-proof body 11 corresponding to the circular arc section, and the arrangement of the explosion-proof section 131 in the straight line section can further reduce the probability that the thinnest explosion-proof section 131 is subjected to shrinkage deformation or even fusing under the influence of the welding energy of the connecting part 12, and ensure the effective valve opening of the explosion-proof valve 10, so that the safety performance and the use reliability of the battery are better ensured. On the other hand, the length of the weak portion 13 of the annular runway is longer in the straight line section and can be prolonged according to actual requirements, so that the blasting length of the blasting section 131 is ensured, the dimension of the explosion-proof valve 10 in the width direction is prevented from being increased, the explosion-proof valve is matched with the conventional rectangular plate-shaped end cover, and the manufacturing cost of the battery is reduced.
Through the relative and interval setting of linkage segment 133 and blasting segment 131, after blasting segment 131 receives certain gas pressure to break, the both ends of the explosion-proof body 11 periphery of initial rupture mouth can be along the track of blasting segment 131 to and extend to the track of first changeover portion 132 and second changeover portion 134 and continue to break, avoid the tip of the explosion-proof body 11 periphery of breaking the mouth to need follow the track of the direct entering junction of track of blasting segment 131, thereby effectively reduce the resistance that the opening of explosion-proof valve 10 continues to increase, guarantee that the opening reaches certain opening size in the short time and in time discharges gas, guarantee the timeliness of opening the valve of explosion-proof valve 10, thereby promote the security performance and the reliability in use of battery. Through setting up first changeover portion 132 and including the circular arc section and the straightway that extends towards linkage segment 133, second changeover portion 134 includes the circular arc section and the straightway that extends towards linkage segment 133, can reduce the resistance of breaking the mouth in the department of turning, guarantees that the opening mouth reaches certain opening size and in time discharges gas in the short time, guarantees the timeliness of opening the valve of explosion-proof valve 10 to promote the security performance and the reliability in use of battery.
Referring to fig. 3 and 4, fig. 3 is a schematic cross-sectional view of the explosion valve 10 shown in fig. 2 along the direction B-B, and fig. 4 is a schematic cross-sectional view of the explosion valve 10 shown in fig. 1 along the direction A-A.
The thickness d3 of the burst segment 131 is smaller than the thickness d2 of the first transition segment 132 and the thickness d4 of the second transition segment 134, and the thickness d2 of the first transition segment 132 and the thickness d4 of the second transition segment 134 are smaller than the thickness of the connection segment 133. In the present embodiment, the thickness d2 of the first transition section 132 and the thickness d4 of the second transition section 134 are equal, that is, d2=d4. That is, the weak portion 13 in the embodiment of the present application has the largest thickness d1 of the connection section 133 and the smallest thickness d3 of the explosion section 131, and the thickness d2 of the first transition section 132 and the thickness d4 of the second transition section 134 are equal and are between the thickness d1 of the connection section 133 and the thickness d3 of the explosion section 131, i.e., d3 < d2=d4 < d1.
The weak part of the explosion-proof valve in the prior art can be broken in time to discharge gas when the battery reaches a certain pressure threshold value, so that the thickness of the weak part cannot be too thick. The weak part of the explosion-proof valve in the prior art is single in thickness, so that the whole weak part of the explosion-proof valve in the prior art is thinner. The welding temperature of the explosion-proof valve and the end cover is higher, and the probability that the weak part of the explosion-proof valve in the prior art is affected by welding energy to shrink and deform or even fuse is higher, so that the explosion-proof valve fails.
By providing the connecting segment 133 with the greatest thickness d1 and the smallest thickness d3 of the bursting segment 131, the thickness d2 of the first transition segment 132 and the thickness d4 of the second transition segment 134 are equal and are between the thickness d1 of the connecting segment 133 and the thickness d3 of the bursting segment 131, the weak portion 13 of the explosion proof valve 10 of the embodiment of the present application has various thicknesses compared to the explosion proof valve of the prior art. By providing the weak portion 13 with various thicknesses, the length ratio of the blasting segments 131 is reduced, and the probability that the thinnest blasting segment 131 is affected by welding energy to shrink and deform or even fuse can be effectively reduced. Meanwhile, by setting the minimum thickness of the explosion section 131, when the inside of the battery reaches a certain pressure threshold, the gas in the battery can be flushed out and broken by the thinnest explosion section 131, the gas is discharged in time, the explosion of the battery is avoided, and the valve opening sensitivity of the explosion-proof valve 10 is ensured. Through setting up thickness d2 of first changeover portion 132 and thickness d4 of second changeover portion 134 equal and between thickness d1 of linkage segment 133 and thickness d3 of blasting section 131, receive certain gas pressure after breaking when blasting section 131, the explosion-proof body 11 peripheral of breaking the mouth can continue to break along the track of blasting section 131 and extend to the track of first changeover portion 132 and second changeover portion 134, guarantees that the opening of explosion-proof valve 10 reaches certain opening size in the short time and in time discharges gas, guarantees the timeliness of opening the valve of explosion-proof valve 10. By setting the thickness of the connecting section 133 to be maximum, the explosion-proof body 11 can form an explosion port for exhausting gas at the weak part 13, but the explosion-proof body is not separated from the explosion-proof valve 10 completely to cause the splashing phenomenon, and the safety performance and the use reliability of the battery are ensured.
In some embodiments, the thickness D1 of the connecting section 133 is in a range of the thickness D1 of the explosion-proof body 11: D1/D1 is more than or equal to 40% and less than or equal to 70%; the thickness of the first transition section 132 is equal to the thickness of the second transition section 134, and the ratio of the thickness d2 of the second transition section 134 to the thickness d1 of the connecting section 133 is in the range of: d2/d1 is more than or equal to 70% and less than or equal to 90%; the ratio of the thickness d3 of the blasting section 131 to the thickness d1 of the connecting section 133 ranges from: d2/d1 is more than or equal to 60% and less than or equal to 90%. The range of the ratio of the thickness D1 of the connecting section 133 to the thickness D1 of the explosion-proof body 11 is as follows: the thickness of the thickest connecting section 133 in the weak part 13 is also smaller than the thickness of the explosion-proof body 11 by more than 40 percent and less than or equal to 70 percent, when the battery reaches a certain pressure, the explosion-proof body 11 can be blasted from the weak part 13 preferentially, meanwhile, the connection effect of the connecting section 133 and the explosion-proof body 11 part on the inner side surface of the weak part 13 is ensured, and the explosion-proof body 11 part on the inner side surface of the weak part 13 is ensured not to be completely separated from the explosion-proof valve 10 under larger air pressure to cause the splashing phenomenon, so that the safety performance and the use reliability of the battery are better ensured. By setting the thickness of the first transition section 132 equal to the thickness of the second transition section 134, the ratio of the thickness d2 of the second transition section 134 to the thickness d1 of the connecting section 133 is in the range of: the d2/d1 is more than or equal to 70% and less than or equal to 90%, so that after the explosion section 131 is ruptured by certain gas pressure, the outer periphery of the ruptured explosion-proof body 11 can be further ruptured along the track of the explosion section 131 and the track extending to the first transition section 132 and the second transition section 134, thereby better ensuring that the opening port of the explosion-proof valve 10 reaches a certain opening size in a short time and timely discharges gas, and ensuring the opening timeliness of the explosion-proof valve 10. The ratio of the thickness d3 of the burst segment 131 to the thickness d1 of the connecting segment 133 is set as follows: d2/d1 is more than or equal to 60% and less than or equal to 90%, so that when the inside of the battery reaches a certain pressure threshold, gas in the battery can be flushed out and broken by the thinnest explosion section 131, and the gas is discharged in time, so that the explosion of the battery is avoided, and the valve opening sensitivity of the explosion-proof valve 10 is better ensured.
In some embodiments, the ratio of the thickness d3 of the burst segment 131 to the burst pressure threshold F of the battery is in the range of 0.1 mm/MPa.ltoreq.d3/F.ltoreq.0.2 mm/MPa. Specifically, the ratio of the thickness d3 of the burst segment 131 to the burst pressure threshold F of the battery may be, but is not limited to, 0.1mm/MPa, 0.11mm/MPa, 0.12mm/MPa, 0.13mm/MPa, 0.14mm/MPa, 0.15mm/MPa, 0.16mm/MPa, 0.17mm/MPa, 0.18mm/MPa, 0.19mm/MPa, 0.2mm/MPa. Further, the ratio of the thickness d3 of the burst segment 131 to the burst pressure threshold F of the battery is in the range of 0.14 mm/MPa.ltoreq.d3/F.ltoreq.0.16 mm/MPa. The range of the ratio of the thickness d3 of the blasting section 131 to the blasting pressure threshold F of the battery is 0.1 mm/MPa-0.2 mm/MPa, so that the thickness of the blasting section 131 is moderate and the use requirement is met. On the one hand, the thickness of the explosion section 131 is prevented from being too thick, when the inside of the battery reaches a certain pressure threshold value, gas in the battery can be flushed out and broken by the thinnest explosion section 131, the gas is discharged in time, the explosion of the battery is prevented, and the valve opening sensitivity of the explosion-proof valve 10 is ensured. On the other hand, the thickness of the explosion-proof section 131 is prevented from being too thin, the structural stability of the explosion-proof section 131 is ensured to be higher when the explosion-proof valve 10 and the end cover 20 are welded, and the use reliability of the explosion-proof valve 10 is ensured, so that the safety performance and the use reliability of the battery are ensured.
In some embodiments, the section of the explosion-proof section 131 along the thickness direction of the explosion-proof body 11 is in an inverted trapezoid shape, the explosion section 131 includes an explosion side wall 131a and an explosion bottom wall 131b (see fig. 3), the explosion bottom wall 131b is disposed parallel to the first surface 11a and the second surface 11b of the explosion-proof body 11, and the explosion side wall 131a is connected to the explosion bottom wall 131b and disposed at an included angle. In order to further avoid the occurrence of undesirable phenomena such as crack defects caused by stress concentration at the explosion position or metal powder accumulation at the corners during punching of the explosion-proof valve 10, the explosion side wall 131a and the explosion bottom wall 131b are transited through an arc surface. In addition, the side walls and the bottom wall of the connecting section 133, the first transition section 132 and the second transition section 134 may also be transited by arc surfaces, which will not be described herein.
In some embodiments, the frangible portion 13 further includes a junction (not shown) disposed at the ends of the first transition segment 132 and the second transition segment 134. The connecting portion is an inclined plane or a curved plane with gradually changed thickness along the extending direction of the first transition section 132 and the second transition section 134, and the connecting portion is used for gradually reducing or gradually increasing the thickness at the connection position of the first transition section 132 and the blasting section 131 or the connection section 133 and at the connection position of the second transition section 134 and the blasting section 131 or the connection section 133. Specifically, the engagement portion is a curved surface. At the connection of the first transition section 132 and the blasting section 131, the thickness of the connection part gradually decreases along the extending direction of the first transition section 132 towards the blasting section 131; at the junction of the second transition section 134 and the blasting section 131, the thickness of the junction gradually decreases along the extending direction of the second transition section 134 toward the blasting section 131. At the connection between the first transition section 132 and the connection section 133, the thickness of the connection section gradually increases along the extending direction of the first transition section 132 toward the connection section 133; at the junction of the second transition section 134 and the connection section 133, the thickness of the junction gradually increases along the extending direction of the second transition section 134 toward the connection section 133. The thickness d1 of the connecting section 133, the thickness d2 of the first transition section 132, the thickness d3 of the blasting section 131, and the thickness d4 of the second transition section 134 do not include the thickness of the joint portion. Through setting up the linking portion in the junction of first changeover portion 132 and blasting section 131 or linkage segment 133, the junction of second changeover portion 134 and blasting section 131 or linkage segment 133, can guarantee that weak portion 13 is in different segmentation, realize smooth transition in the aspect of thickness, after blasting section 131 receives certain gas pressure and breaks, the explosion-proof body 11 periphery of breaking the mouth can continue to break along the track of blasting section 131 and the track that extends smoothly to first changeover portion 132 and second changeover portion 134, effectively reduce the resistance that the opening of explosion-proof valve 10 continues to increase, guarantee that the opening reaches certain opening size in the short time and in time discharges gas, guarantee the timeliness of opening the valve of explosion-proof valve 10, thereby promote the security performance and the reliability in use of battery.
Referring to fig. 1 and 2, the reinforcing rib 14 is disposed around and spaced apart from the outer periphery of the weakened portion 13 and between the weakened portion 13 and the connecting portion 12. Along the thickness direction of the explosion-proof body 11, the reinforcing ribs 14 are provided protruding from the first surface 11a of the explosion-proof body 11 in a direction away from the second surface 11b of the explosion-proof body 11. The reinforcing rib 14 according to the embodiment of the present application may be obtained by punching the explosion-proof body 11 through a punching process. By arranging the reinforcing ribs 14, the structural strength of the explosion-proof body 11 can be enhanced, and the explosion-proof body 11 is not easy to deform in the assembly process or the use process, so that the use reliability of the explosion-proof valve 10 is ensured. Through setting up the strengthening rib 14 between weak portion 13 and connecting portion 12 and from the first surface 11a of explosion-proof body 11 to the direction protrusion setting of deviating from the second surface 11b of explosion-proof body 11, can play certain separation effect to the welding heat when connecting portion 12 welds, reduce the welding heat and carry out the heat transfer from connecting portion 12 to weak portion 13, further reduce the probability that weak portion 13 especially thinnest blasting section 131 takes place shrinkage deformation and even fuses under the influence of welding energy to guarantee the validity and the reliability of use of explosion-proof valve 10 better, and then guarantee the security performance of battery. The outer peripheral outline of the rib 14 may be the same as the outer peripheral outline of the connecting portion 12 or the same as the outer peripheral outline of the weakened portion 13. Preferably, the outer peripheral outline of the reinforcing rib 14 is identical to the outer peripheral outline of the weakened portion 13. In this embodiment, the reinforcing rib 14 is also in an annular runway-shaped structure, so that on one hand, the uniformity of supporting the structural strength of the reinforcing rib 14 on the weak area can be ensured, and on the other hand, the distance between the opposite angle of the rectangular explosion-proof body 11 and the welding heat at the fillet of the dispersed connecting part 12 can be increased through the arc section, so that the uniformity of blocking the welding heat by the reinforcing rib 14 is ensured.
Referring to fig. 1 and 2, the connecting rib 15 has a substantially inclined structure, one end of the connecting rib 15 is connected to the reinforcing rib 14, and the other end of the connecting rib 15 is connected to the weak portion 13. The connecting rib 15 is at least partially protruding from the first surface 11a in a direction away from the second surface 11b in the thickness direction of the explosion-proof body 11. The protruding height of the connecting rib 15 with respect to the first surface 11a is gradually reduced in the direction of the reinforcing rib 14 toward the weak portion 13. By adding the connecting rib 15 between the reinforcing rib 14 and the weak portion 13, the structural support strength of the reinforcing rib 14 to the weak portion 13 can be further increased. By providing the connecting rib 15 with a gradually decreasing projection height relative to the first surface 11a in the direction of the reinforcing rib 14 toward the weakened portion 13, the connecting rib 15 can exert a similar structural reinforcing effect as the reinforcing rib 14, but the degree of structural reinforcement is different at different positions of the connecting rib 15. The structural reinforcement of the connecting rib 15 is gradually weakened in the direction of the reinforcing rib 14 toward the weakened portion 13. The connection between the connecting rib 15 and the weak portion 13 is not protruded relative to the first surface 11a, and the connecting rib 15 has no substantial structural reinforcement effect, so that the normal open valve of the weak portion 13 can be ensured. The connection between the connecting rib 15 and the reinforcing rib 14 has the greatest protruding height with respect to the first surface 11a, and the structural reinforcement effect of the connecting rib 15 is the greatest. The structural reinforcement of the connecting bead 15 is gradually increased in the direction of the weakened portion 13 toward the reinforcing bead 14. When the air pressure in the battery is large, the explosion-proof body 11 is lifted and turned over under the action of the air pressure at the part which is positioned between the reinforcing rib 14 and the weak part 13 and provided with the connecting rib 15, but the explosion-proof body is not separated from the reinforcing rib 14, so that the explosion-proof valve 10 is prevented from splashing, and the valve opening area of the explosion-proof valve 10 and the safety performance of the battery are further ensured.
The connecting rib 15 includes a first connecting rib 151, one end of the first connecting rib 151 is connected with the reinforcing rib 14, and the other end of the connecting rib 15 is connected with the connecting section 133. In this embodiment, one end of the first connecting rib 151 is connected to the center line of the connecting segment 133. Through setting up first connecting rib 151 between strengthening rib 14 and linkage segment 133, can further guarantee the joint strength of linkage segment 133, because linkage segment 133 sets up and joint strength is stronger with blasting segment 131 relatively, when the gas in the battery reaches certain pressure, the preferential blasting segment 131 that is thinner and joint strength weaker of follow thickness breaks, guarantees the sensitivity of battery valve opening. When the air pressure in the battery is large, the connecting section 133 is connected with the reinforcing rib 14 through the connecting rib 15, so that the whole explosion-proof body 11 can be prevented from being broken by the weak portion 13 under the action of the air pressure, the explosion-proof valve 10 is further prevented from splashing, and the effectiveness of the explosion-proof valve 10 and the safety performance of the battery are better ensured.
In some embodiments, the connecting bar 15 may further include a second connecting bar 152. The plurality of second connecting ribs 152 are disposed at intervals along the circumferential direction of the weak portion 13, one end of each second connecting rib 152 is connected to the reinforcing rib 14, and the other end of each second connecting rib 152 is connected to the first transition section 132 or the second transition section 134. Further, the plurality of second connecting ribs 152 are symmetrically distributed along the arrangement direction of the connecting section 133 and the blasting section 131. By providing the second connecting rib 152 between the reinforcing rib 14 and the first transition section 132 or between the reinforcing rib 14 and the second transition section 134, the explosion-proof body 11 portion between the reinforcing rib 14 and the weak portion 13 can be restrained from being deformed by the acting force in the forming process of the reinforcing rib 14 or the weak portion 13, thereby affecting the explosion pressure value of the explosion-proof valve 10, and further improving the structural strength of the explosion-proof body 11 portion between the reinforcing rib 14 and the weak portion 13. By arranging the plurality of second connecting ribs 152 symmetrically distributed along the arrangement direction of the connecting section 133 and the blasting section 131, the uniformity of reinforcing the structural strength of the explosion-proof body 11 by the plurality of connecting ribs 15 can be ensured. In this embodiment, the number of the second connecting ribs 152 is six, and the six second connecting ribs 152 are symmetrically distributed along the arrangement direction of the connecting section 133 and the blasting section 131.
The structural possibilities of the connecting rib 15 will be described below by means of three different embodiments.
In a possible embodiment, referring to fig. 3, in the thickness direction of the explosion-proof body 11, an end of the connecting rib 15 connected to the reinforcing rib 14 is flush with an end of the reinforcing rib 14 away from the first surface 11a, and an end of the connecting rib 15 connected to the weak portion 13 is flush with the first surface 11a of the explosion-proof body 11. The side of the connecting rib 15 facing away from the first surface 11a is formed by recessing the explosion-proof body 11 along the second surface 11b toward the first surface 11a, and the depth of the recession gradually decreases along the direction of the connecting rib 15 toward the weak portion 13. That is, the thickness of the connecting rib 15 is the same as or similar to the thickness of the explosion-proof body 11, the greater the depth of the recess of the side of the connecting rib 15 facing away from the first surface 11a with respect to the second surface 11b, the greater the height of the protrusion of the side of the connecting rib 15 facing away from the second surface 11b with respect to the first surface 11 a. Through setting up the sunken one side that deviates from first surface 11a at connecting rib 15, can further improve connecting rib 15 to explosion-proof body 11's structural strength reinforcing effect and linking, avoid explosion-proof valve 10 to splash, improve the security performance of battery.
In another possible embodiment, the same contents as those of the first embodiment will not be repeated, and unlike the first embodiment, please refer to fig. 5, fig. 5 is another schematic cross-sectional view of the explosion-proof valve 10 along the direction B-B shown in fig. 2, and a side of the connecting rib 15 facing away from the first surface 11a is flush with the second surface 11B of the explosion-proof body 11. That is, the thickness of the connecting rib 15 at different positions is greater than or equal to the thickness of the explosion-proof body 11, and the side of the connecting rib 15 facing away from the first surface 11a is not provided with a recess. Compared with the first embodiment, the side of the connecting rib 15 away from the first surface 11a is flush with the second surface 11b of the explosion-proof body 11, so that the stamping process of the side of the connecting rib 15 away from the first surface 11a can be reduced, and the production efficiency of the explosion-proof valve 10 can be improved.
In another possible implementation manner, the same contents as those of the second embodiment will not be repeated, and, unlike the second implementation manner, please refer to fig. 6 and 7, fig. 6 is a schematic structural diagram of another explosion-proof valve 10 provided by the embodiment of the present application, and fig. 7 is a schematic sectional view of the explosion-proof valve 10 along the direction C-C shown in fig. 6. The end of the connecting rib 15 connected to the weak portion 13 is flush with the bottom wall of the weak portion 13 and lower than the first surface 11a of the explosion-proof body 11. Illustratively, the end of the first connecting rib 15 that is connected to the weakened portion 13 is flush with the bottom wall of the connecting section 133. That is, in the direction of the first surface 11a toward the first surface 11a, the end of the connecting bead 15 to which the weak portion 13 is connected is recessed with respect to the first surface 11a, and the thickness of the end of the connecting bead 15 to which the weak portion 13 is connected is smaller than the thickness of the explosion-proof body 11. Through setting up the one end that connecting rib 15 and weak portion 13 are connected with the diapire of weak portion 13 and flush, can reduce the area of contact of connecting rib 15 and explosion-proof body 11, reduce the joint strength of connecting rib 15 and explosion-proof body 11, after the blasting section 131 of weak portion 13 blasting, the explosion-proof body 11 periphery that is more favorable to breaking the crack can continue to break along the track of blasting section 131 and the track that extends to first changeover portion 132 and second changeover portion 134, guarantee that the opening of explosion-proof valve 10 reaches certain opening size and in time discharges gas in the short time, guarantee the timeliness of opening the valve of explosion-proof valve 10 better.
Referring to fig. 2, the connecting portion 12 has a substantially rectangular ring structure, the connecting portion 12 is connected to the periphery of the explosion-proof body 11, and the connecting portion 12 is used for connecting with the end cap 20. The connection part 12 and the explosion-proof body 11 are also provided with rounded corners at opposite angles. Through setting up the fillet in connecting portion 12 and explosion-proof body 11's diagonal angle department, both can guarantee connecting portion 12 and explosion-proof body 11's lateral surface laminating degree, the automatic point of getting of connecting portion 12 in the corner when being convenient for again weld reduces connecting portion 12 in the welding degree of difficulty of corner to guarantee welding efficiency and welding yields. Further, the fillet at the diagonal corner of the connecting part 12 near the explosion-proof body 11 is a first fillet 121, the fillet at the diagonal corner of the connecting part 12 far away from the explosion-proof body 11 is a second fillet 122, and the ratio of the size R1 of the second fillet 122 to the size R2 of the first fillet 121 is 1/2.ltoreq.R1/R2.ltoreq.4/5. Further, the size R1 of the first rounded corner 121 may be in the range of 0.2 mm.ltoreq.R1.ltoreq.6 mm, and the size R2 of the second rounded corner 122 may be in the range of 0.2 mm.ltoreq.R2.ltoreq.10 mm. Referring to fig. 3, the thickness D2 of the connecting portion 12 is greater than the thickness D1 of the explosion-proof body 11, and the ratio of the thickness D1 of the explosion-proof body 11 to the thickness D2 of the connecting portion 12 is in the range of: D1/D2 is more than or equal to 40% and less than or equal to 80%. Preferably, the ratio of the thickness D1 of the explosion-proof body 11 to the thickness D2 of the connecting portion 12 ranges from: D1/D2 is more than or equal to 50% and less than or equal to 70%. By setting the thickness D2 of the connecting portion 12 to be greater than the thickness D1 of the explosion-proof body 11, the range of the ratio of the thickness D1 of the explosion-proof body 11 to the thickness D2 of the connecting portion 12 is: D1/D2 is more than or equal to 40% and less than or equal to 80%, on one hand, the structural stability of the connecting part 12 and the end cover 20 can be ensured to be higher when the connecting part is welded; on the other hand, the connecting portion 12 and the explosion-proof body 11 with different thicknesses can be obtained by stamping the partial areas of the raw material plate of the explosion-proof valve 10, deformation of the connecting portion 12 and the explosion-proof body 11 caused by overlarge stamping depth can be avoided by setting the range of the ratio of the thickness D1 of the explosion-proof body 11 to the thickness D2 of the connecting portion 12, the welding of the connecting portion 12 and the structural strength of the explosion-proof body 11 are influenced, and too small stamping pressure can be avoided, so that the valve opening sensitivity and the valve opening area of the explosion-proof valve 10 under certain pressure are ensured, and the structural strength and the use reliability of the explosion-proof valve 10 are ensured.
Referring to fig. 2, in some embodiments, the inner side surface of the reinforcing rib 14 and the explosion-proof body 11 form a valve opening region 16, and the weak portion 13, the first connecting rib 151 and the second connecting rib 152 are located in the valve opening region 16. When the gas in the battery reaches a certain pressure, the thinnest explosion section 131 of the weak part 13 is cracked preferentially, then the opening size of the cracking crack is continuously increased along the extending direction of the explosion section 131 to the first transition section 132 and the extending direction of the explosion section 131 to the second transition section 134 to realize primary explosion of the explosion-proof valve 10, when the pressure in the battery is larger, the gas pressure breaks through the connection part between the second connecting rib 152 and the first transition section 132 or the second transition section 134, the explosion-proof body 11 on the inner side surface of the weak part 13 is opened and overturned under the connection action of the connecting section 133, the first connecting rib 151 and the reinforcing rib 14, but is not separated from the reinforcing rib 14, and the explosion-proof body 11 between the outer side surface of the weak part 13 and the connecting rib 15 is opened and overturned under the connection action of the connecting rib 15 and the reinforcing rib 14, but is not separated from the reinforcing rib 14, so that secondary explosion of the explosion-proof valve 10 is realized. After the secondary explosion, the outer circumference of the explosion-proof body 11 of the inner side surface of the reinforcing rib 14 may be connected to the reinforcing rib 14 to prevent the explosion-proof valve 10 from splashing.
The inner side surface of the reinforcing rib 14 and the explosion-proof body 11 form a valve opening area 16, and the area S1 of the valve opening area 16 accounts for the total area S of the explosion-proof valve 10 in the proportion range: S1/S is more than or equal to 40% and less than or equal to 80%. Further, the area S1 of the valve opening area 16 is in the range of the ratio of the total area S of the explosion-proof valve 10: S1/S is more than or equal to 45% and less than or equal to 70%. The proportion range of the area S1 of the valve opening area 16 to the total area S of the explosion-proof valve 10 is as follows: S1/S is more than or equal to 40% and less than or equal to 80%, on one hand, the valve opening area of the explosion-proof valve 10 can be ensured, the explosion-proof valve 10 can timely discharge gas in a battery in a short time, the valve opening timeliness of the explosion-proof valve 10 is ensured, and the safety performance and the use reliability of the battery are further ensured; on the other hand, provide certain welding area for connecting portion 12 of explosion-proof valve 10 and guarantee welding convenience and welding strength, also provide certain interval for between connecting portion 12 and the strengthening rib 14, reduce the weak portion 13 that is located the strengthening rib 14 and deviates from connecting portion 12 one side and receive the influence of welding energy and take place shrink deformation even fusing probability, guarantee the structural strength and the reliability of using of explosion-proof valve 10, and then guarantee the security performance of battery.
Referring to fig. 8 and 9, fig. 8 is a schematic structural view of an end cap assembly 100 according to an embodiment of the present application, and fig. 9 is an exploded schematic view of the end cap assembly 100 shown in fig. 8.
The cap assembly 100 includes a cap 20, an explosion-proof valve 10, and a protection sheet 23, and the cap 20 includes a cap body 21 and an explosion-proof through hole 22 provided on the cap body 21, the explosion-proof through hole 22 penetrating the cap body 21 in a thickness direction of the cap body 21. When the explosion-proof valve 10 is assembled with the end cover body 21, the connecting portion 12 of the explosion-proof valve 10 is connected to the surface of the end cover body 21 facing the battery cell side, and the explosion-proof body 11 of the explosion-proof valve 10 is located in the explosion-proof through hole 22 and connected with the wall of the explosion-proof through hole 22. The protection sheet 23 is laminated with the explosion-proof valve 10 and is located at a side of the explosion-proof valve 10 away from the end cover body 21, and the protection sheet 23 is used for connection with the explosion-proof valve 10. The explosion-proof valve 10 can be protected from the external environment by the protection of the protection sheet 23. The protection sheet 23 and the explosion-proof valve 10 are located at both sides of the end cap 20 in the axial direction of the explosion-proof through hole 22.
Referring to fig. 10 and 11, fig. 10 is a schematic structural view of a battery 200 according to an embodiment of the present application, and fig. 11 is an exploded schematic view of the battery 200 shown in fig. 10.
The battery 200 provided in the embodiment of the application includes: the end cover assembly 100, the battery cell 110, the switching piece 130 and the shell 120, the surface of the shell 120 can be adhered with the protective film 140, the battery cell 110 is positioned inside the shell 120, the battery cell is protected from the external environment by the shell 120 and the protective film 140, and the connection between the battery cell 110 and the end cover assembly 100 is realized through the switching piece 130.
Wherein the battery 200 is a secondary battery. Such as nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid (or lead-storage) batteries, lithium-ion batteries, polymer lithium-ion batteries, and the like. In other embodiments, the battery 200 may also be a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, or a sodium ion battery, or a magnesium ion battery, etc. The battery 200 may be rectangular, cylindrical, or other shape. In the embodiment of the present application, the battery 200 is a rectangular parallelepiped.
It should be understood that the battery 200 described in the examples of the present application is only one form of the battery 200 to which the end cap assembly is applied, and should not be construed as limiting the battery 200 provided by the present application or the end cap assembly 100 provided by the various embodiments of the present application.
Referring to fig. 12, fig. 12 is a schematic structural diagram of an energy storage device 300 according to an embodiment of the application. The energy storage device 300 provided in the embodiment of the application includes: the housing 310 and the plurality of batteries 200 are electrically connected and each of the plurality of batteries 200 is located inside the housing 310, which can be protected from the external environment by the housing 310. In this embodiment, one energy storage device 300 includes a plurality of batteries 200. The plurality of batteries 200 are arranged at intervals. The plurality of batteries 200 may be connected in series, or in parallel, or a mixture of series and parallel to achieve a larger capacity and power.
It should be understood that the energy storage device 300 described in the embodiments of the present application is only one form of the energy storage device 300 to which the battery 200 is applied, and should not be construed as limiting the energy storage device 300 provided in the embodiments of the present application or as limiting the battery 200 provided in the various embodiments of the present application.
Finally, it should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the above-mentioned preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present application without departing from the spirit and scope of the technical solution of the present application.
Claims (8)
1. The explosion-proof valve is characterized by comprising an explosion-proof body and a connecting part, wherein the connecting part is connected to the periphery of the explosion-proof body, the explosion-proof body is provided with a weak part, the thickness of the weak part is smaller than that of the explosion-proof body, the weak part comprises a blasting section, a first transition section, a second transition section and a connecting section, the blasting section is opposite to the connecting section and is arranged at intervals, the first transition section is connected with one end of the blasting section and one end of the connecting section, the second transition section is connected with the other end of the blasting section and the other end of the connecting section, the thickness of the blasting section is smaller than that of the first transition section and that of the second transition section, and the thickness of the first transition section and the thickness of the second transition section are smaller than that of the connecting section.
The ratio K1 of the length of the blasting section at the circumference of the weak part is 15% -45% or less, the ratio K2 of the length of the connecting section at the circumference of the weak part is 10% -45% or less, and the ratio of the length of the blasting section at the circumference of the weak part is larger than or equal to the ratio of the length of the connecting section at the circumference of the weak part;
the explosion-proof body comprises a first surface and a second surface which are oppositely arranged, the explosion-proof body is also provided with reinforcing ribs and connecting ribs, the reinforcing ribs are arranged around the periphery of the weak part at intervals and between the weak part and the connecting part, along the thickness direction of the explosion-proof body, the reinforcing ribs are arranged in a protruding mode from the first surface in a direction away from the second surface, and the reinforcing ribs are formed by stamping the explosion-proof body through a stamping process;
one end of the connecting rib is connected with the reinforcing rib, at least part of the other end of the connecting rib is connected with the weak portion, the connecting rib is at least partially protruded from the first surface to the direction deviating from the second surface along the thickness direction of the explosion-proof body, the connecting rib is gradually reduced relative to the protruded height of the first surface along the direction of the reinforcing rib towards the weak portion.
2. The explosion protection valve according to claim 1, wherein the connection rib includes a first connection rib, one end of the first connection rib is connected to the reinforcing rib, and at least a part of the other end of the first connection rib is connected to the connection section.
3. The explosion protection valve according to claim 2, wherein the connection ribs further comprise a plurality of second connection ribs, the plurality of second connection ribs are arranged at intervals along the circumferential direction of the weak portion, one end of each second connection rib is connected with the reinforcing rib, and at least part of the other end of each second connection rib is connected with the first transition section or the second transition section.
4. The explosion-proof valve according to claim 3, wherein the inner side surface of the reinforcing rib and the explosion-proof body form a valve opening area, the weak part, the first connecting rib and the second connecting rib are positioned in the valve opening area, and the area S1 of the valve opening area accounts for the total area S of the explosion-proof valve in a proportion range of: S1/S is more than or equal to 40% and less than or equal to 80%.
5. The explosion-proof valve according to claim 1, wherein the ratio of the thickness D1 of the connecting section to the thickness D1 of the explosion-proof body is in the range of: D1/D1 is more than or equal to 40% and less than or equal to 70%;
The thickness of the first transition section is equal to that of the second transition section, and the ratio range of the thickness d2 of the second transition section to the thickness d1 of the connecting section is as follows: d2/d1 is more than or equal to 70% and less than or equal to 90%;
the ratio range of the thickness d3 of the blasting section to the thickness d1 of the connecting section is as follows: d2/d1 is more than or equal to 60% and less than or equal to 90%.
6. An end cap assembly comprising an end cap and the explosion-proof valve of any one of claims 1-5, the end cap comprising an end cap body and an explosion-proof through hole extending through the end cap body in a thickness direction of the end cap body, the connecting portion being located in the explosion-proof through hole and connected to a wall of the explosion-proof through hole.
7. A battery comprising a housing, a battery cell and the end cap assembly of claim 6, wherein the battery cell is disposed within the housing, the end cap assembly is mated with the housing to seal the battery cell, and the end cap assembly is electrically connected to the battery cell.
8. An energy storage device comprising a housing and a plurality of the cells of claim 7, wherein the plurality of cells are electrically connected in a manner comprising at least one of series and parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310851843.1A CN116557596B (en) | 2023-07-12 | 2023-07-12 | Explosion-proof valve, end cover assembly, battery and energy storage device |
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| CN202310851843.1A CN116557596B (en) | 2023-07-12 | 2023-07-12 | Explosion-proof valve, end cover assembly, battery and energy storage device |
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| CN117080671B (en) * | 2023-10-16 | 2024-01-26 | 厦门海辰储能科技股份有限公司 | Top cover assembly, battery, energy storage device and electricity utilization device |
| CN117878519B (en) * | 2024-03-08 | 2024-05-14 | 蜂巢能源科技股份有限公司 | Battery core |
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