CN117080671B - Top cover assembly, battery, energy storage device and electricity utilization device - Google Patents
Top cover assembly, battery, energy storage device and electricity utilization device Download PDFInfo
- Publication number
- CN117080671B CN117080671B CN202311331794.5A CN202311331794A CN117080671B CN 117080671 B CN117080671 B CN 117080671B CN 202311331794 A CN202311331794 A CN 202311331794A CN 117080671 B CN117080671 B CN 117080671B
- Authority
- CN
- China
- Prior art keywords
- area
- pressure relief
- pressure
- weak
- areas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004146 energy storage Methods 0.000 title claims abstract description 25
- 230000005611 electricity Effects 0.000 title description 6
- 238000009434 installation Methods 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 230000000149 penetrating effect Effects 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000003792 electrolyte Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 7
- 238000009825 accumulation Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000003405 preventing effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/30—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
-
- 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 of a single cell or a single battery
- H01M50/147—Lids or covers
- H01M50/148—Lids or covers characterised by their shape
- H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
-
- 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
Abstract
The invention discloses a top cover assembly, a battery, an energy storage device and an electric device, wherein the top cover assembly comprises a top cover plate and an explosion-proof valve, the top cover plate is provided with a first surface and a second surface which are opposite, and the top cover plate is provided with a mounting position; the explosion-proof valve comprises a body part and a pressure relief part arranged on the body part, wherein a plurality of weak areas are arranged on the pressure relief part, the pressure relief part is divided into a plurality of pressure relief areas, the thickness of each weak area is different and is smaller than that of the pressure relief area, so that the tearing strength of the plurality of weak areas is different and is smaller than that of the pressure relief area, and the weak areas corresponding to the plurality of pressure relief areas can be respectively torn correspondingly in different pressure relief pressures to form pressure relief openings of different pressure relief pressures.
Description
Technical Field
The application relates to the technical field of electric devices, in particular to a top cover assembly, a battery, an energy storage device and an electric device.
Background
The battery includes the casing, set up in the electric core of casing and lid and close the top cap subassembly on the opening of casing, and wherein, top cap subassembly includes top cap piece and explosion-proof valve, is provided with the installation position of explosion-proof valve on the top cap piece, and explosion-proof valve seal welds on the installation position, and when the battery took place thermal runaway, explosion-proof valve open valve was with the formation pressure release mouth, and the gas in the battery was discharged through the pressure release mouth to reduce the inside pressure of battery.
However, in the related art, when the battery is out of control, the explosion-proof valve is opened completely in the moment, and in this state, because the pressure in the battery is far greater than the valve opening pressure of the explosion-proof valve, on one hand, the gas that is poured out will wrap up in and hold the electrolyte to be sprayed out from the pressure relief opening, thereby causing the potential safety hazard, on the other hand, the pressure in the battery can also promote the battery core to move towards the explosion-proof valve, thereby making the battery core push up in the pressure relief opening, causing the condition that the pressure relief opening is blocked, further improving the potential safety hazard of the battery.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a top cover assembly, a battery, an energy storage device and an electricity utilization device, which can reduce the risks that electrolyte is sprayed out through a pressure relief opening and a battery core props against the pressure relief opening, thereby reducing the potential safety hazard of the battery.
In order to solve the above technical problem, in a first aspect, the present invention provides a top cap assembly, including:
the top cover plate is provided with a first surface and a second surface which are opposite to each other along the thickness direction of the top cover plate, and the top cover plate is provided with a mounting position penetrating through the first surface and the second surface;
the explosion-proof valve, the explosion-proof valve install in the installation position, the explosion-proof valve include body portion and set up in pressure release portion on the body portion, the peripheral wall of body portion with the interior peripheral wall sealing connection of installation position is provided with a plurality of weak areas on the pressure release portion, a plurality of the weak area will pressure release portion divide into a plurality of pressure release areas, follows first surface orientation the direction of second surface, every the thickness in weak area is different and all is less than the thickness in pressure release area, so that a plurality of the tearing strength in weak area is different and all is less than the intensity in pressure release area, thereby make a plurality of the weak area that the pressure release area corresponds can be respectively corresponding tearing in different pressure release pressure to form the pressure release mouth of different pressure release pressures.
In the application, because a plurality of weak areas divide the pressure release portion into a plurality of pressure release areas, and the thickness of every weak area is different and all is less than the thickness of pressure release area, so that the tear strength of a plurality of weak areas is different and all is less than the intensity of pressure release area, consequently, when pressure release pressure is less, the weak area that the thickness is minimum also is the weak area that tear strength is minimum will be torn, in order to form the pressure release mouth of minimum pressure, thereby make gas discharge in this pressure release mouth, along with the increase of pressure, the weak area that the thickness is great also is the weak area that tear strength is great will be torn in order to form the pressure release mouth that pressure is great. From this, when the top cap subassembly is applied to the battery, and the battery is in thermal runaway, when the inside atmospheric pressure of battery is accumulated to first default pressure, can make tearing strength minimum weak area tear in order to form the pressure release mouth, thereby make the gas in the battery discharge in advance from this pressure release mouth, reduce the accumulation of gas in the battery, if tearing the pressure release mouth that forms in the weak area of tearing strength minimum and can't restrain the pressure in the battery and be in safe level, and when the inside abnormally increased atmospheric pressure of battery risees to second default pressure, the inside atmospheric pressure of battery can make the weak area of tearing strength great be torn in order to form the great pressure release mouth of pressure release pressure, at this moment, the gas in the battery can be discharged through pressure release mouth and the great pressure release mouth of pressure release pressure of pressure that pressure is less, so, the pressure that progressively increased can make tearing strength progressively tear in proper order until the inside pressure of battery is in safe level, it is visible that the atmospheric pressure in the battery can be in comparatively stable level according to the atmospheric pressure in the battery, thereby pressure in the battery is in the time very big pressure release mouth of pressure release valve in the battery is greatly greater than the battery's the pressure of the battery cell and the electrolyte that the pressure of explosion-proof valve has avoided the whole situation to take place because of the pressure in the explosion-proof valve to lead to the battery cell pressure to the explosion-proof valve to the situation.
In one possible implementation, the pressure relief portion has a first direction;
the pressure relief areas are sequentially arranged along the first direction, and the pressure relief pressure of the pressure relief areas is increased or decreased along the first direction.
Because a plurality of pressure release areas are arranged in proper order along first direction, and the pressure release pressure in a plurality of pressure release areas is along first direction increment or decrement, therefore, when the explosion-proof valve received the inside pressure impact of battery, by the pressure release area of pressure release pressure less to the pressure release area that pressure release pressure is great in a plurality of pressure release areas step by step the pressure release, that is to say, tear in proper order to the weak area that the pressure release area that pressure release pressure is great corresponds by the weak area that pressure release pressure is less corresponds in a plurality of pressure release areas, do benefit to the stability that maintains the inside pressure of battery, it is visible, through the pressure in the multistage pressure release dynamic adjustment battery, can make other inside stabilities of battery, thereby further improved the security of battery.
In one possible implementation, the pressure relief portion has a first direction; the pressure relief areas comprise a first pressure relief area, a second pressure relief area, a third pressure relief area, a fourth pressure relief area and a fifth pressure relief area, wherein the first pressure relief area is positioned in the middle of the pressure relief part in the first direction, is far away from the middle of the pressure relief part along the first direction, the second pressure relief area, the third pressure relief area, the fourth pressure relief area and the fifth pressure relief area are sequentially arranged and the pressure relief pressure is increased, and the pressure relief pressure of the first pressure relief area is smaller than that of the second pressure relief area;
The second pressure relief area, the third pressure relief area, the fourth pressure relief area and the fifth pressure relief area comprise two pressure relief areas, two pressure relief areas and the fifth pressure relief areas are symmetrically arranged relative to the first pressure relief area.
Because two second pressure release district, two third pressure release district, two fourth pressure release district and two fifth pressure release district all set up with first pressure release district symmetry, consequently, on the one hand, can increase the interior gaseous exhaust flow of battery to further guaranteed the stability of gas in the battery, on the other hand, tear the back at the weak district that the first pressure release district of battery corresponds, along with the increase of the inside pressure of battery, second pressure release district, third pressure release district, fourth pressure release district and the fifth pressure release of the both sides of first pressure release district symmetry are the pressure release step by step respectively, thereby avoid influencing the stability that pressure release portion is connected for the top cap piece because of the one side pressure release of pressure release portion.
In one possible implementation manner, the pressure relief pressure of the first pressure relief area is 0.8MPa-1.2MPa, the pressure relief pressure of the second pressure relief area is 1.0MPa-1.4MPa, the pressure relief pressure of the third pressure relief area is 1.2MPa-1.6MPa, the pressure relief pressure of the fourth pressure relief area is 1.4MPa-1.8MPa, and the pressure relief pressure of the fifth pressure relief area is 1.6MPa-2.0MPa.
The explosion-proof valve in this application can carry out the pressure release to the gas of different pressure in the battery, compares in the correlation technique and only can to the atmospheric pressure release of 1.8MPa, on the one hand, has enlarged the scope of other pressure release in the battery to further improved the security of battery, on the other hand, through the pressure release step by step, can avoid in the twinkling of an eye whole pressure release because of the explosion-proof valve, improved the stability of gas in the battery.
In addition, when the minimum valve opening pressure of the explosion-proof valve is smaller than 0.8MPa, the first pressure relief area is extremely easy to open when the battery is in normal use, so that the air tightness of the battery is influenced, and when the maximum valve opening pressure of the explosion-proof valve is larger than 2.0MPa, the air pressure in the battery is accumulated excessively when the battery is in thermal runaway, the pressure relief effect is poor, and therefore safety accidents are extremely easy to occur.
In one possible implementation, the valve opening areas of the first pressure relief zone, the second pressure relief zone, the third pressure relief zone, the fourth pressure relief zone, and the fifth pressure relief zone are increased in increments.
Because the tearing strength of the weak areas corresponding to the first pressure relief area, the second pressure relief area, the third pressure relief area, the fourth pressure relief area and the fifth pressure relief area respectively increases, the pressure relief pressures corresponding to the first pressure relief area, the second pressure relief area, the third pressure relief area, the fourth pressure relief area and the fifth pressure relief area respectively increase, and therefore, in order to increase the gas flow discharged from the pressure relief openings corresponding to the first pressure relief area, the second pressure relief area, the third pressure relief area, the fourth pressure relief area and the fifth pressure relief area respectively, the valve opening area of the first pressure relief area, the second pressure relief area, the third pressure relief area, the fourth pressure relief area and the fifth pressure relief area is increased. Therefore, the design that the valve opening area is increased along with the increase of the pressure relief pressure can be matched with the pressure relief effect under high pressure, and meanwhile, the valve opening step by step avoids the conditions that the internal air pressure of the battery is accumulated excessively to cause electrolyte injection and the battery core blocks the explosion-proof valve.
In one possible implementation, the valve opening area of the first pressure relief area is 8mm 2 -12mm 2 The valve opening area of the second pressure relief area is 14mm 2 -18mm 2 The valve opening area of the third pressure relief area is 19mm 2 -25mm 2 The valve opening area of the fourth pressure relief area is 26mm 2 -30mm 2 The valve opening area of the fifth pressure relief area is 31mm 2 -38mm 2 。
Because the valve opening pressure of the first pressure relief area is smaller, the gas amount discharged from the pressure relief opening formed by tearing the weak area corresponding to the first pressure relief area is minimum, so that the valve opening area of the first pressure relief area is minimum, and similarly, the gas amount discharged from the pressure relief opening formed by tearing the weak area corresponding to the fifth pressure relief area is large, so that the valve opening area of the fifth pressure relief area is maximum.
In one possible implementation, the pressure relief portion has a second direction that is at an angle to the first direction, along which the pressure relief portion has opposite first and second side edges;
the plurality of weak areas comprise a first weak area, a second weak area, a third weak area, a fourth weak area and a fifth weak area, wherein the first weak area, the second weak area, the third weak area and the fourth weak area all comprise a vertical extension area connecting the first side edge and the second side edge and a horizontal extension area positioned at the first side edge or the second side edge, the vertical extension area is connected with the horizontal extension area, and the fifth weak area is positioned at the first side edge or the second side edge;
The area enclosed by the first weak area is the first pressure relief area, the area enclosed by the second weak area is the second pressure relief area, the area enclosed by the third weak area is the third pressure relief area, the area enclosed by the fourth weak area is the fourth pressure relief area, and the area enclosed by the fifth weak area is the fifth pressure relief area.
Because the first pressure release area is located the middle part of the first direction of pressure release portion, consequently, the first weak district can enclose the first pressure release area at middle part, that is to say, the vertical extension district in first weak district sets up in the junction in first pressure release district and second pressure release district, and the same reason, the vertical extension district in second weak district sets up in the junction in second pressure release district and third pressure release district, and the vertical extension district in third weak district sets up in the junction in third pressure release district and fourth pressure release district.
In addition, because the first weak area, the second weak area, the third weak area and the fourth weak area all comprise a vertical extension area connected with the first side edge and the second side edge and a transverse extension area positioned on the first side edge or the second side edge, the vertical extension area is connected with the transverse extension area, and therefore, the tearing of the weak areas is facilitated on the premise of guaranteeing the tearing strength of the weak areas, the valve opening effect of the explosion-proof valve is guaranteed, and in addition, as the two fifth pressure relief areas are respectively positioned at the two ends of the pressure relief part in the first direction, in order to guarantee the pressure relief pressure of the fifth pressure relief areas, the fifth pressure relief areas are positioned on the first side edge or the second side edge.
In one possible implementation, the laterally extending region of the first region of weakness, the laterally extending region of the second region of weakness, the laterally extending region of the third region of weakness, and the laterally extending region of the fourth region of weakness, and a fifth region of weakness are all located at the second side edge.
The first weak area, the second weak area, the third weak area, the fourth weak area and the fifth weak area are all located at the second side edge, that is, the first weak area, the second weak area, the third weak area, the fourth weak area, and the fifth weak area are all located at the same side edge of the pressure relief portion, so that compared with the first weak area, the second weak area, the third weak area, the fourth weak area, and the fifth weak area, the first weak area, the second weak area, the third weak area, and the fourth weak area are located at least partially at the first side edge, and the second weak area, the third weak area, the fourth weak area, and the fifth weak area are located at the second side edge.
In one possible implementation, the pressure relief portion has a second direction that is at an angle to the first direction, along which the pressure relief portion has opposite first and second side edges;
the plurality of weak areas comprise a first weak area, a second weak area, a third weak area, a fourth weak area and a fifth weak area, wherein the first weak area, the second weak area, the third weak area and the fourth weak area respectively comprise a first extending area positioned at the edge of the first side and a second extending area positioned at the edge of the second side, the fifth weak area is positioned at the edge of the first side or the edge of the second side, the area enclosed by the first weak area is the first pressure relief area, the area enclosed by the second weak area is the second pressure relief area, the area enclosed by the third weak area is the third pressure relief area, the area enclosed by the fourth weak area is the fourth pressure relief area, and the area enclosed by the fifth weak area is the fifth pressure relief area.
Because the first extension district and the second extension district are located first side edge and second side edge respectively, consequently, on the one hand, improved the relief pressure of every relief area, do benefit to the great explosion-proof valve of setting up relief pressure, on the other hand, after a plurality of relief areas all open the valve, can interconnect between every adjacent two relief areas to do benefit to the recovery of explosion-proof valve.
In one possible implementation, the weak areas are all score lines, and the depth of the score of each weak area is different.
Because the pressure relief pressures corresponding to the pressure relief areas formed by the weak areas are different, the depths of the scores of the weak areas are different, so that the pressure relief pressures corresponding to the pressure relief areas are different.
In one possible implementation, the depth of the score of the weakened zone is d,25 μm.ltoreq.d.ltoreq.150 μm.
If the depth of the score of the weakened area is smaller than 25 μm, the thickness of the weakened area is thicker along the thickness direction of the pressure relief portion, and the strength of the weakened area is higher, so that the weakened area needs to be torn, and a larger pressure is required, which can cause the pressure relief pressure of the pressure relief area to be excessively large, thereby increasing the potential safety hazard of the battery. If the depth of the notch of the weak area is greater than 150 μm, the thickness of the weak area is thinner along the thickness direction of the pressure release part, and the strength of the weak area is lower, so that even if the pressure generated by gas generated in normal use of the battery causes the weak area to enclose the formed pressure release area to open a valve, the air tightness of the battery is affected, and based on the air tightness, the depth of the notch of the weak area is between 25 μm and 150 μm through comprehensive consideration, the valve opening pressure of each pressure release area can be ensured, and the safety of the battery can be improved.
In a second aspect, the present invention also provides a battery comprising:
a housing including a receiving cavity having an opening;
the battery cell is arranged in the accommodating cavity;
the cap assembly of the first aspect, wherein the cap assembly covers the opening.
Because the top cover assembly in the first aspect is adopted by the battery, when the battery is in thermal runaway, the valve of the first pressure relief area can be opened in advance to perform pre-exhaust, so that the accumulation of pressure in the housing is reduced, but when the valve of the first pressure relief area cannot inhibit the pressure in the housing to be at a reasonable level, the abnormally increased pressure can enable the valve of the second pressure relief area to be opened, and so on until the valve of the fifth pressure relief area enables the other in the housing to be at a reasonable level, and therefore, when the battery is in thermal runaway, the valves of the first pressure relief area, the second pressure relief area and the fifth pressure relief area are opened step by step, so that the situation that the pressure accumulation in the housing is excessive, and electrolyte injection and an explosion-proof valve of a battery core is blocked is avoided.
In a third aspect, the present invention also provides an energy storage device comprising at least one battery according to the second aspect.
Since the energy storage device includes the battery in the second aspect, the safety of the energy storage device is improved.
In a fourth aspect, the present invention also provides an electric device, which includes the energy storage device of the third aspect.
Since the electricity utilization device includes the energy storage device in the third aspect, the stability of electricity utilization of the electricity utilization device is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a top cover assembly according to an embodiment of the present invention;
fig. 2 is a schematic three-dimensional structure of an explosion-proof valve according to an embodiment of the present invention;
FIG. 3 is a top view of an explosion protection valve provided by an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a pressure relief portion in an explosion-proof valve according to an embodiment of the present invention;
fig. 5 is a schematic structural view of a weak area according to an embodiment of the present invention;
FIG. 6 is a schematic view of another embodiment of the present invention;
FIG. 7 is a cross-sectional view taken at A-A of FIG. 3;
FIG. 8 is an enlarged partial schematic view at B in FIG. 7;
fig. 9 is a schematic structural diagram of a battery according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of an energy storage device according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of an electrical device according to an embodiment of the present invention.
Reference numerals illustrate:
100-explosion-proof valve; 111-a body portion; 112-pressure relief section; 1121-a first side edge; 1122-a second side edge; 113-a pressure relief zone; 1131-a first pressure relief zone; 1132-a second pressure relief zone; 1133-third pressure relief zone; 1134-fourth pressure relief zone; 1135-fifth pressure relief zone; 120-zone of weakness; 121-a first area of weakness; 122-a second zone of weakness; 123-a third zone of weakness; 124-fourth zone of weakness; 125-a fifth area of weakness;
200-a top cover assembly; 210-a top cover sheet; 211-a first surface; 212-a second surface; 220-applying plastic; 230-lower plastic; 240-pole.
300-cell; 310-a housing; 320-cell;
400-an energy storage device;
500-electricity utilization device.
Detailed Description
The following description of the embodiments of the present invention 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 invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present invention and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.
Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present invention will be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, the terms "mounted," "configured," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, the terms "first," "second," and the like, are used primarily to distinguish between different devices, elements, or components (the particular species and configurations may be the same or different), and are not used to indicate or imply the relative importance and number of devices, elements, or components indicated. Unless otherwise indicated, the meaning of "a plurality" is two or more.
As described in the background art of the present application, in the related art, when thermal runaway occurs in the battery, the explosion-proof valve is opened in the whole instant, and in this state, because the pressure inside the battery is far greater than the valve opening pressure of the explosion-proof valve, on the one hand, the poured gas will be wrapped up in and is blown out by the electrolyte from the pressure relief opening, thereby causing potential safety hazards, on the other hand, the pressure inside the battery can also push the battery cell to move towards the explosion-proof valve, thereby making the battery cell push at the pressure relief opening, causing the condition that the pressure relief opening is blocked, and further improving the potential safety hazards of the battery.
In order to solve the technical problems mentioned in the background art, the invention provides a top cover assembly, a battery, an energy storage device and an electric device, wherein a plurality of weak areas are arranged on a pressure release part of an explosion-proof valve, the pressure release part can be divided into a plurality of pressure release areas, and as the tearing strength of the weak areas corresponding to each pressure release area is different, the pressure release pressures corresponding to the pressure release areas are different, namely, the greater the tearing strength of the weak areas corresponding to the pressure release areas is, namely, the greater the pressure release pressure of the pressure release areas is, namely, the weak areas of the tearing pressure release areas can be corresponding to the pressure release pressure according to the magnitude of the pressure release pressure, so that the explosion-proof valve can realize the purpose of multistage pressure release, thereby reducing the risk that electrolyte is sprayed out through a pressure release opening and a battery core props against the pressure release opening, and further reducing the potential safety hazard of the battery.
The present application is described in detail below by way of specific examples:
referring to fig. 1 and 2, an embodiment of the present application provides a top cap assembly 200, where the top cap assembly 200 includes a top cap piece 210, an explosion-proof valve 100, an upper plastic 220, a lower plastic 230, and a pole 240, where the top cap piece 210 has a first surface 211 and a second surface 212 opposite to each other along a thickness direction thereof, and a mounting position penetrating through the first surface 211 and the second surface 212 is provided on the top cap piece 210; the explosion-proof valve 100 comprises a body part 111 and a pressure relief part 112 arranged on the body part 111, wherein the outer peripheral wall of the body part 111 is in sealing connection with the inner peripheral wall of the installation position, a plurality of weak areas 120 are arranged on the pressure relief part 112 to divide the pressure relief part 112 into a plurality of pressure relief areas 113, the direction of a second surface 212 (namely, the direction indicated by an arrow Z1 in fig. 1) is pointed along a first surface 211, the thickness of each weak area 120 is different and is smaller than the thickness of the pressure relief area 113, so that the tearing strength of the plurality of weak areas 120 is different and is smaller than the strength of the pressure relief areas 113, and the weak areas 120 corresponding to the plurality of pressure relief areas 113 can be respectively torn when the pressure relief pressures are different, so as to form pressure relief openings of different pressure relief pressures; the upper plastic 220 is disposed on the first surface 211 of the top cover 210, the lower plastic 230 is disposed on the second surface 212 of the top cover 210, and the lower plastic 230 is provided with a vent hole penetrating the lower plastic 230 and communicating with the mounting location; the pole 240 sequentially penetrates the lower plastic 230, the top cover 210 and the lower plastic 230.
The top cap assembly 200 may be applied to a square battery or a round battery.
In addition, the plurality of weakened areas 120 refers to two or more than two number of weakened areas 120. The tear strength refers to the ability of the weakened area 120 to fracture or significantly deform under the pressure of the gas within the cell.
The pressure relief portion 112 is disposed inside the main body 111, and the thickness of the pressure relief portion 112 is smaller than that of the main body 111, and the structure of the pressure relief portion 112 is not limited, for example, the pressure relief portion 112 has a bar-shaped structure and a circular structure, and in this embodiment, the pressure relief portion 112 has a sheet-shaped structure and has a first direction and a second direction, and along the first direction, the pressure relief portion 112 includes a first sector, a large area and a second sector.
In addition, the shape of the weakened area 120 is not limited, and for example, the weakened area 120 is a straight line extending in the second direction of the pressure relief portion 112, or an arc line segment, or a broken line segment (for example, the weakened area 120 has an "L" shape).
In this embodiment, since the pressure relief portion 112 is divided into the pressure relief areas 113 by the weak areas 120, and the thickness of each weak area 120 is different and smaller than that of the pressure relief area 113, so that the tearing strength of the weak areas 120 is different and smaller than that of the pressure relief area 113, when the pressure relief pressure is smaller, the weak area with the smallest thickness, that is, the weak area 120 with the smallest tearing strength, will be torn to form the pressure relief opening with the smallest pressure, so that the gas is discharged from the pressure relief opening, and as the pressure increases, the weak area with the larger thickness, that is, the weak area 120 with the larger tearing strength, will be torn to form the pressure relief opening with the larger pressure. Therefore, when the top cover assembly 200 is applied to a battery, and the battery is in thermal runaway, when the air pressure in the battery is accumulated to the first preset pressure, the weak area 120 with the minimum tearing strength can be torn to form a pressure relief opening, so that air in the battery is discharged from the pressure relief opening in advance, accumulation of the air in the battery is reduced, if the pressure relief opening formed by tearing the weak area 120 with the minimum tearing strength cannot inhibit the pressure in the battery to be at a safe level, and when the air pressure abnormally increased in the battery is increased to the second preset pressure, the pressure in the battery can enable the weak area 120 with the large tearing strength to be torn to form a pressure relief opening with large pressure relief pressure, at this moment, the air in the battery can be discharged through the pressure relief opening with small pressure relief pressure and the pressure relief opening with large pressure, and thus the gradually increased pressure can enable the weak area 120 with the tearing strength to be sequentially torn until the pressure in the battery is at the safe level, and the pressure in the battery can be dynamically adjusted, namely, the air pressure in the battery can be at a stable level according to the air pressure in the battery, and the battery is enabled to be at the safe level, so that the pressure in the battery is far-reaching the stable level due to the pressure of the pressure in the battery inner explosion-proof valve 100, and the situation of the battery is prevented from being far-reaching the problem that the pressure of the explosion-proof valve 100 is increased or the pressure is caused by the pressure of the explosion-proof valve.
In addition, compared with the arrangement of a plurality of other structures to realize the multistage pressure relief of the explosion-proof valve 100, the structure in the embodiment is simple and is convenient for design.
It should be noted that the ranges of the first preset pressure and the second preset pressure are not limited herein, and the second preset pressure is greater than the first preset pressure.
In some possible embodiments, referring to fig. 3, the pressure relief portion 112 has a first direction, the plurality of pressure relief areas 113 are sequentially arranged along the first direction, and the pressure relief pressure of the plurality of pressure relief areas 113 increases or decreases along the first direction.
The first direction of the pressure relief portion 112 refers to the direction indicated by the X arrow in fig. 3, and the first directions mentioned below refer to the directions indicated by the X arrow.
Because the pressure relief pressure of the pressure relief areas 113 increases or decreases gradually along the first direction, when the explosion-proof valve 100 is impacted by the pressure inside the battery, the pressure relief areas 113 with smaller pressure relief pressure in the pressure relief areas 113 gradually relieve the pressure to the pressure relief areas 113 with larger pressure relief pressure, that is, the weak areas 120 corresponding to the pressure relief areas 113 with larger pressure relief pressure in the pressure relief areas 113 with smaller pressure relief pressure in the pressure relief areas 113 can be sequentially torn, so that the stability of the pressure inside the battery is maintained, and the pressure inside the battery can be dynamically regulated through multistage pressure relief, so that other parts inside the battery are stable, and the safety of the battery is further improved.
In some possible embodiments, referring to fig. 3 and 4, the plurality of pressure relief areas 113 include a first pressure relief area 1131, a second pressure relief area 1132, a third pressure relief area 1133, a fourth pressure relief area 1134, and a fifth pressure relief area 1135, the first pressure relief area 1131 is located in the middle of the pressure relief portion 112 along the first direction and away from the middle of the pressure relief portion 112, the second pressure relief area 1132, the third pressure relief area 1133, the fourth pressure relief area 1134, and the fifth pressure relief area 1135 are sequentially arranged and the pressure relief pressure is increased, and the pressure relief pressure of the first pressure relief area 1131 is smaller than that of the second pressure relief area 1132; the second pressure relief area 1132, the third pressure relief area 1133, the fourth pressure relief area 1134 and the fifth pressure relief area 1135 all comprise two, and the two second pressure relief areas 1132, the two third pressure relief areas 1133, the two fourth pressure relief areas 1134 and the two fifth pressure relief areas 1135 are all symmetrically arranged with respect to the first pressure relief areas 1131.
The number of pressure relief areas 113 include a first pressure relief area 1131, a second pressure relief area 1132, a third pressure relief area 1133, a fourth pressure relief area 1134, and a fifth pressure relief area 1135, which are not to be construed as limiting the number of pressure relief areas 113, but are arranged in five different gradients, and of course, the gradients of the pressure relief areas 113 are not limited to the five gradients, for example, in other embodiments, the pressure relief areas 113 may further include a first pressure relief area 1131, a second pressure relief area 1132, and a third pressure relief area 1133, or include a first pressure relief area 1131, a second pressure relief area 1132, a third pressure relief area 1133, and a fourth pressure relief area 1134.
The middle portion refers to that the center line of the pressure relief portion 112 in the first direction coincides with or has a smaller distance from the center line of the first pressure relief region 1131 in the first direction (i.e., the first pressure relief region 1131 is located approximately in the middle portion of the pressure relief portion 112 in the first direction).
Since the gas in the battery accumulates in the middle of the battery during thermal runaway of the battery, in order to improve the pre-venting of the gas in the battery by the first pressure relief zone 1131, the first pressure relief zone 1131 with the minimum pressure relief is located in the middle of the pressure relief portion 112.
In addition, since the two second pressure relief areas 1132, the two third pressure relief areas 1133, the two fourth pressure relief areas 1134 and the two fifth pressure relief areas 1135 are respectively and symmetrically arranged with respect to the first pressure relief area 1131, on one hand, the flow rate of the gas discharged from the battery can be increased, so that the stability of the gas in the battery is further ensured, and on the other hand, the second pressure relief areas 1132, the third pressure relief areas 1133, the fourth pressure relief areas 1134 and the fifth pressure relief areas 1135 are sequentially arranged along the first direction and away from the middle of the pressure relief portion 112, and the pressure relief pressure is gradually increased, so that after the weak area 120 corresponding to the first pressure relief area 1131 of the battery is torn, the second pressure relief areas 1132, the third pressure relief areas 1133, the fourth pressure relief areas 1134 and the fifth pressure relief areas 1131 on two sides of the first pressure relief area 1131 are respectively and gradually relieved along with the increase of the pressure inside the battery, thereby avoiding the influence on the stability of the connection of the pressure relief portion 112 relative to the top cover plate 210 due to the pressure relief of one side of the pressure relief portion 112.
In addition, it should be noted that, while the above description is given by taking the plurality of pressure relief areas 113 as five gradients, of course, the plurality of pressure relief areas 113 may be other odd number, and the arrangement manner is the same as that described above when the plurality of pressure relief areas 113 are other odd number, and the plurality of pressure relief areas 113 are sequentially increased or decreased along the first direction and the direction away from the middle portion 112 of the pressure relief portion when the plurality of pressure relief areas 113 are even number of gradients.
In some possible embodiments, the pressure relief pressure in the first pressure relief zone 1131 is 0.8MPa-1.2MPa, the pressure relief pressure in the second pressure relief zone 1132 is 1.0MPa-1.4MPa, the pressure relief pressure in the third pressure relief zone 1133 is 1.2MPa-1.6MPa, the pressure relief pressure in the fourth pressure relief zone 1134 is 1.4MPa-1.8MPa, and the pressure relief pressure in the fifth pressure relief zone 1135 is 1.6MPa-2.0MPa.
In this embodiment, when the air pressure in the battery is between 0.8MPa and 1.2MPa, the weak area 120 corresponding to the first pressure release area 1131 in the explosion-proof valve 100 will be torn to form a primary pressure release opening, so that the air in the battery is discharged through the primary pressure release opening, when the air pressure in the battery continuously rises to between 1.0MPa and 1.4MPa, the weak area 120 corresponding to the second pressure release area 1132 in the explosion-proof valve 100 will be torn to form a middle-stage pressure release opening, so that the air in the battery is discharged through the middle-stage pressure release opening and the primary pressure release opening simultaneously, and similarly, when the air pressure in the battery continuously rises to between 1.2MPa and 1.6MPa, the weak area 120 corresponding to the third pressure release area 1133 in the explosion-proof valve 100 will be torn to form a three-stage pressure release opening, so that the air in the battery is discharged through the three-stage pressure release opening, the middle-stage pressure release opening and the primary pressure release opening simultaneously until the air pressure in the battery rises to between 1.6MPa and 2.0MPa, and the fifth pressure release area 1135 is discharged to the maximum pressure release opening, namely the whole of the explosion-proof valve is formed.
Therefore, the explosion-proof valve 100 in this embodiment can release pressure on the gas with different pressure in the battery, and compared with the pressure release of 1.8MPa in the related art, on one hand, the range of other pressure release in the battery is enlarged, so as to further improve the safety of the battery, on the other hand, by releasing pressure step by step, the instantaneous overall pressure release due to the explosion-proof valve 100 can be avoided, and the stability of the gas in the battery is improved.
In addition, when the minimum valve opening pressure of the explosion-proof valve 100 is less than 0.8MPa, the first pressure relief area 1131 is very easy to open during normal use of the battery, so as to affect the air tightness of the battery, and if the maximum valve opening pressure of the explosion-proof valve 100 is greater than 2.0MPa, when the battery is in thermal runaway, the air pressure in the battery is excessively accumulated, the pressure relief effect is poor, and thus safety accidents are very easy to occur.
In addition, the above-mentioned difference in the relief pressure of the different relief areas 113 is achieved by controlling the thickness of the weak area 120 corresponding to the different relief areas 113, that is, the thickness of the weak area 120 corresponding to the relief area 113 with the smallest relief pressure is the smallest, and the thickness of the weak area 120 corresponding to the relief area 113 with the largest relief pressure is the largest.
In some possible embodiments, referring to FIG. 5, the valve opening areas of first pressure relief zone 1131, second pressure relief zone 1132, third pressure relief zone 1133, fourth pressure relief zone 1134, and fifth pressure relief zone 1135 are incremented.
Because the tear strength of the weak area 120 corresponding to each of the first pressure relief area 1131, the second pressure relief area 1132, the third pressure relief area 1133, the fourth pressure relief area 1134 and the fifth pressure relief area 1135 is increased, the pressure relief pressures corresponding to each of the first pressure relief area 1131, the second pressure relief area 1132, the third pressure relief area 1133, the fourth pressure relief area 1134 and the fifth pressure relief area 1135 are increased, so that the opening areas of the first pressure relief area 1131, the second pressure relief area 1132, the third pressure relief area 1133, the fourth pressure relief area 1134 and the fifth pressure relief area 1135 are increased in order to increase the gas flow rates discharged from the pressure relief openings corresponding to each of the first pressure relief area 1131, the second pressure relief area 1132, the third pressure relief area 1133, the fourth pressure relief area 1134 and the fifth pressure relief area 1135. Therefore, the design that the valve opening area is increased along with the increase of the pressure relief pressure can be matched with the pressure relief effect under high pressure, and meanwhile, the valve opening step by step avoids the situation that the electrolyte is sprayed and the battery core blocks the explosion-proof valve 100 due to the fact that the air pressure in the battery is accumulated excessively.
In addition, it is noted that the valve opening area of the second pressure relief area 1132 is larger than the valve opening area of the first pressure relief area 1131, the valve opening area of the third pressure relief area 1133 is larger than the valve opening area of the second pressure relief area 1132, the valve opening area of the fourth pressure relief area 1134 is larger than the valve opening area of the third pressure relief area 1133, the valve opening area of the fifth pressure relief area 1135 is larger than the valve opening area of the fourth pressure relief area 1134, and the valve opening areas corresponding to the first pressure relief area 1131, the second pressure relief area 1132, the third pressure relief area 1133, the fourth pressure relief area 1134 and the fifth pressure relief area 1135 are respectively increased according to the relationship of an equal difference array, an equal ratio array or other forms, which is not limited.
In addition, the above-mentioned valve opening area refers to an area of the area formed by surrounding the weak area 120 corresponding to each pressure release area 113, for example, the weak area 120 corresponding to one pressure release area 113 includes a transverse weak area and a longitudinal weak area, and then the pressure release area of the pressure release area is an area of the area formed by surrounding the transverse weak area and the longitudinal weak area.
In some possible embodiments, the open valve area of first pressure relief zone 1131 is 8mm 2 -12mm 2 The open area of the second pressure relief zone 1132 is 14mm 2 -18mm 2 The third pressure relief zone 1133 has a valve opening area of 19mm 2 -25mm 2 The fourth pressure relief zone 1134 has a valve opening area of 26mm 2 -30mm 2 The valve opening area of the fifth pressure relief zone 1135 is 31mm 2 -38mm 2 。
Because the valve opening pressure of the first pressure release area 1131 is smaller, the amount of gas discharged from the pressure release opening formed by tearing the weak area 120 corresponding to the first pressure release area 1131 is minimum, so that the valve opening area of the first pressure release area 1131 is minimum, and similarly, the amount of gas discharged from the pressure release opening formed by tearing the weak area 120 corresponding to the fifth pressure release area 1135 is large, so that the valve opening area of the fifth pressure release area 1135 is maximum.
In addition, the valve opening area of the first pressure relief area 1131 is smaller than 8mm 2 In this case, the pressure release effect of the first pressure release region 1131 is affected, and the valve opening area of the second pressure release region 1132 is not smaller than 14mm 2 The valve opening area of the third pressure relief zone 1133 cannot be less than 19mm 2 The valve opening area of the fourth pressure relief zone 1134 is not less than 26mm 2 And the valve opening area of the fifth pressure relief zone 1135 is not less than 31mm 2 . If the valve opening area of the first pressure relief zone 1131 is greater than 12mm 2 The valve opening area of the second pressure relief zone 1132 is greater than 18mm 2 The valve opening area of the third pressure relief zone 1133 is greater than 25mm 2 The valve opening area of the fourth pressure relief zone 1134 is greater than 30mm 2 Or fifth pressure relief zone 1135 has a valve opening area greater than 38mm 2 One or both of the relief areasWhen the valve opening areas of the cover sheet 210 are all larger than the predetermined value, the strength of the cover sheet will be affected.
The weakened area 120 is provided in a variety of arrangements, in some possible embodiments, referring to fig. 5, the pressure relief portion 112 has a second direction that is angled with respect to the first direction, and along the second direction, the pressure relief portion 112 has opposed first and second side edges 1121, 1122; the plurality of weak areas includes a first weak area 121, a second weak area 122, a third weak area 123, a fourth weak area 124, and a fifth weak area 125, where the first weak area 121, the second weak area 122, the third weak area 123, and the fourth weak area 124 each include a vertically extending area connecting the first side edge 1121 and the second side edge 1122 and a horizontally extending area located at the first side edge 1121 or the second side edge 1122, the vertically extending area is connected to the horizontally extending area, the fifth weak area 125 is located at the first side edge 1121 or the second side edge 1122, the area enclosed by the first weak area 121 is a first pressure relief area 1131, the area enclosed by the second weak area 122 is a second pressure relief area 1132, the area enclosed by the third weak area 123 is a third pressure relief area 1133, the area enclosed by the fourth weak area 124 is a fourth pressure relief area 1134, and the area enclosed by the fifth weak area 125 is a fifth pressure relief area 1135.
The second direction and the first direction may be perpendicular to each other, or may be an acute angle or an obtuse angle, and in this embodiment, the description is mainly given by taking the second direction and the first direction as examples, that is, the second direction of the pressure relief portion 112 refers to the direction indicated by the Y arrow in fig. 5, that is, the direction perpendicular to the first direction, and the second directions mentioned below refer to the directions indicated by the Y arrow.
Because the first pressure relief area 1131 is located in the middle of the pressure relief portion 112 in the first direction, the first weak area 121 can enclose the first pressure relief area 1131 in the middle, that is, the vertically extending area of the first weak area 121 is disposed at the connection between the first pressure relief area 1131 and the second pressure relief area 1132, and similarly, the vertically extending area of the second weak area 122 is disposed at the connection between the second pressure relief area 1132 and the third pressure relief area 1133, and the vertically extending area of the third weak area 123 is disposed at the connection between the third pressure relief area 1133 and the fourth pressure relief area 1134.
In addition, since the first weak area 121, the second weak area 122, the third weak area 123, and the fourth weak area 124 each include a vertically extending area connecting the first side edge 1121 and the second side edge 1122 and a laterally extending area located at the first side edge 1121 or the second side edge 1122, the vertically extending area is connected to the laterally extending area, so that tearing of the weak area 120 is facilitated under the premise of ensuring the tearing strength of the weak area 120, and the valve opening effect of the explosion-proof valve 100 is ensured, and in addition, since the two fifth pressure releasing areas 1135 are located at both ends of the pressure releasing portion 112 in the first direction, respectively, in order to ensure the pressure releasing pressure of the fifth pressure releasing areas 1135, the fifth pressure releasing areas 1135 are located at the first side edge 1121 or the second side edge 1122.
Further, the above-described vertically extending region connecting the first side edge 1121 and the second side edge 1122, it should be understood that the vertically extending region extends in the second direction of the relief portion 112 and penetrates the relief portion 112 in the second direction of the relief portion 112.
In one possible embodiment, referring to fig. 5, the laterally extending region of the first region of weakness 121, the laterally extending region of the second region of weakness 122, the laterally extending region of the third region of weakness 123 and the laterally extending region of the fourth region of weakness 124, and the fifth region of weakness 125 are all located at the second side edge 1122.
Because the laterally extending region of the first weakpoint region 121, the laterally extending region of the second weakpoint region 122, the laterally extending region of the third weakpoint region 123, and the laterally extending region of the fourth weakpoint region 124, and the fifth weakpoint region 125 are located at the second side edge 1122, that is, the laterally extending region of the first weakpoint region 121, the laterally extending region of the second weakpoint region 122, the laterally extending region of the third weakpoint region 123, and the laterally extending region of the fourth weakpoint region 124, and the fifth weakpoint region 125 are located at the same side edge of the pressure relief portion 112, the pressure relief area is ensured on the one hand, compared to the laterally extending region of the first weakpoint region 121, the laterally extending region of the second weakpoint region 122, the laterally extending region of the third weakpoint region 123, and the laterally extending region of the fourth weakpoint region 124, and the fifth weakpoint region 125 being located at least partially at the first side edge 1121, and partially at the second side edge 1122, and the other partially at the second side edge 1122, respectively, such that the pressure relief area 1132, the third pressure relief region 1133, the fourth pressure relief region 1134, and the fifth pressure relief region 1135 are facilitated on the one side.
Of course, the specific shapes of the first weak area 121, the second weak area 122, the third weak area 123, the fourth weak area 124 and the fifth weak area 125 are not limited to the above-mentioned structures, and in other possible embodiments, referring to fig. 6, the first weak area 121, the second weak area 122, the third weak area 123 and the fourth weak area 124 each include a first extension area located at the first side edge 1121 and a second extension area located at the second side edge 1122, the fifth weak area 125 is located at the first side edge 1121 or the second side edge 1122, the area enclosed by the first weak area 121 is the first pressure relief area 1131, the area enclosed by the second weak area 122 is the second pressure relief area 1132, the area enclosed by the third weak area 123 is the third pressure relief area 1133, the area enclosed by the fourth weak area 124 is the fourth pressure relief area 1134, and the area enclosed by the fifth weak area 125 is the fifth pressure relief area 5.
In this embodiment, since the first extension area and the second extension area are located at the first side edge 1121 and the second side edge 1122, respectively, on one hand, the pressure relief pressure of each pressure relief area 113 is increased, which is beneficial to setting the explosion-proof valve 100 with larger pressure relief pressure, and on the other hand, after the plurality of pressure relief areas 113 are opened, every two adjacent pressure relief areas 113 can be connected to each other, which is beneficial to recovering the explosion-proof valve 100.
In some possible embodiments, referring to fig. 7, the plurality of regions of weakness 120 are each score lines, with the depth of the score of each region of weakness 120 being different.
The score line refers to a line segment formed by scoring the pressure relief portion 112, that is, the pressure relief portion 112 is removed along the extending direction of the score line to form the weak area 120. And the depth of the score line refers to the distance that the score of the score line extends within the pressure relief portion 112.
Since the pressure relief pressures corresponding to the pressure relief areas 113 formed by the weak areas 120 are different, the depths of the scores of each weak area 120 are different, so as to correspond to the pressure relief pressures of the pressure relief areas 113.
It is noted that the deeper the depth of the score of the weakened area 120, the smaller the pressure relief pressure of the corresponding pressure relief area 113, and the shallower the depth of the score of the weakened area 120, the greater the pressure relief pressure of the corresponding pressure relief area 113.
In some possible embodiments, referring to FIG. 8, the score of the weakened area 120 has a depth d of 25 μm.ltoreq.d.ltoreq.150 μm.
It should be noted that, d is equal to or less than 25 μm and equal to or less than 150 μm, it should be understood that the depth of the score of the weak area 120 corresponding to the pressure relief area 113 with the minimum pressure relief (i.e., the first pressure relief area 1131) is not greater than 150 μm, and the depth of the score of the weak area 120 corresponding to the pressure relief area 113 with the maximum pressure relief (i.e., the fifth pressure relief area 1135) is not less than 25 μm.
If the depth of the score of the weakened area 120 is less than 25 μm, the thickness of the weakened area 120 is thicker along the thickness direction of the pressure relief portion 112, and thus, the strength of the weakened area 120 is higher, and thus, a greater pressure is required to tear the weakened area 120, which may cause the pressure relief pressure of the pressure relief area 113 to be excessively high, thereby increasing the safety hazard of the battery. If the depth of the score of the weakened area 120 is greater than 150 μm, the weakened area 120 is thinner along the thickness direction of the pressure relief portion 112, and the strength of the weakened area 120 is lower, so that even if the pressure generated by the gas generated during normal use of the battery causes the weakened area 120 to enclose the formed pressure relief area 113 to open a valve, the air tightness of the battery is affected, and based on the comprehensive consideration, the depth of the score of the weakened area 120 is between 25 μm and 150 μm, so that the valve opening pressure of each pressure relief area 113 can be ensured, and the safety of the battery can be improved.
Referring to fig. 9, the embodiment of the present application further provides a battery 300, where the battery 300 includes a housing 310, a battery cell 320, and a top cap assembly 200, and the housing 310 includes a receiving cavity having an opening; wherein, the battery cell 320 is installed in the accommodating cavity; the cap assembly 200 is capped at the opening.
The top cover assembly 200 in the embodiment of the present application may have the same structure as any of the top cover assemblies 200 in the above embodiments, and may bring about the same or similar beneficial effects, and specifically, reference may be made to the description in the above embodiments, which is not repeated herein.
Because the battery 300 employs the top cap assembly 200 in the above embodiment, when thermal runaway occurs in the battery 300, the gas in the housing 310 is accumulated to be able to open the valve of the first pressure release region 1131 in advance to perform pre-venting, so as to reduce the pressure accumulation in the housing 310, but when the valve of the first pressure release region 1131 cannot inhibit the pressure in the housing 310 to be at a reasonable level, the abnormally increased pressure will cause the valve of the second pressure release region 1132 to open, and so on, until the valve of the fifth pressure release region 1135 causes the other in the housing 310 to be at a reasonable level, so that when thermal runaway occurs in the battery 300, the valves of the first pressure release region 1131, the second pressure release region 1132 to the fifth pressure release region 1135 are opened step by step, so as to avoid excessive air pressure accumulation in the housing 310, causing electrolyte injection and blocking of the explosion-proof valve 100 by the battery cell 320.
The battery may be a lithium battery or a nickel battery.
Referring to fig. 10, an embodiment of the present application further provides an energy storage device 400, where the energy storage device 400 includes at least one battery 300 of the above embodiments.
The energy storage device 400 may be a device capable of storing energy, such as a battery pack, a battery module, a secondary battery, or the like.
Since the energy storage device 400 in the present embodiment includes the battery 300 in the above-described embodiment, the safety of the energy storage device 400 is improved.
Referring to fig. 11, an embodiment of the present application further provides an electric device 500, where the electric device 500 includes the energy storage device 400 in the foregoing embodiment.
The power utilization device 500 may be a device such as an exhaust fan, a new energy automobile, and a ventilation system that needs to provide electric energy to the energy storage device 400.
Since the power utilization device 500 in the present embodiment includes the energy storage device 400 in the above embodiment, the stability of the performance of the power utilization device 500 is improved.
Optionally, the power utilization device 500 further includes a control system and an actuator electrically connected to the control system, where the control system is further electrically connected to the energy storage device 400, and thus, the control system can control the energy storage device 400 to provide corresponding electric energy according to the power required by the actuator.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (13)
1. A header assembly, comprising:
the top cover plate is provided with a first surface and a second surface which are opposite to each other along the thickness direction of the top cover plate, and the top cover plate is provided with a mounting position penetrating through the first surface and the second surface;
the explosion-proof valve is arranged at the installation position and comprises a body part and pressure relief parts arranged on the body part, the outer peripheral wall of the body part is in sealing connection with the inner peripheral wall of the installation position, a plurality of weak areas are arranged on the pressure relief parts, the pressure relief parts are divided into a plurality of pressure relief areas, the direction of the first surface to the second surface is along, and the thickness of each weak area is different and smaller than that of the pressure relief area;
the pressure relief part is provided with a first direction;
the pressure relief areas are sequentially arranged along the first direction, and the pressure relief pressure of the pressure relief areas is increased or decreased along the first direction.
2. The header assembly of claim 1, wherein the pressure relief portion has a first direction;
the pressure relief areas comprise a first pressure relief area, a second pressure relief area, a third pressure relief area, a fourth pressure relief area and a fifth pressure relief area, wherein the first pressure relief area is positioned in the middle of the pressure relief part in the first direction, is far away from the middle of the pressure relief part along the first direction, the second pressure relief area, the third pressure relief area, the fourth pressure relief area and the fifth pressure relief area are sequentially arranged and the pressure relief pressure is increased, and the pressure relief pressure of the first pressure relief area is smaller than that of the second pressure relief area;
The second pressure relief area, the third pressure relief area, the fourth pressure relief area and the fifth pressure relief area comprise two pressure relief areas, two pressure relief areas and the fifth pressure relief areas are symmetrically arranged relative to the first pressure relief area.
3. The header assembly of claim 1, wherein the plurality of relief areas comprises a first relief area, a second relief area, a third relief area, a fourth relief area, and a fifth relief area; the pressure relief pressure of the first pressure relief area is 0.8MPa-1.2MPa, the pressure relief pressure of the second pressure relief area is 1.0MPa-1.4MPa, the pressure relief pressure of the third pressure relief area is 1.2MPa-1.6MPa, the pressure relief pressure of the fourth pressure relief area is 1.4MPa-1.8MPa, and the pressure relief pressure of the fifth pressure relief area is 1.6MPa-2.0MPa.
4. The header assembly of claim 3, wherein the valve opening areas of the first pressure relief zone, the second pressure relief zone, the third pressure relief zone, the fourth pressure relief zone, and the fifth pressure relief zone are increasing.
5. The header assembly of claim 4, wherein the first pressure relief zone has a valve opening area of 8mm 2 -12mm 2 The valve opening area of the second pressure relief area is 14mm 2 -18mm 2 The valve opening area of the third pressure relief area is 19mm 2 -25mm 2 The valve opening area of the fourth pressure relief area is 26mm 2 -30mm 2 The valve opening area of the fifth pressure relief area is 31mm 2 -38mm 2 。
6. The header assembly of claim 2, wherein the pressure relief portion has a second direction at an angle to the first direction, the pressure relief portion having opposite first and second side edges along the second direction;
the plurality of weak areas comprise a first weak area, a second weak area, a third weak area, a fourth weak area and a fifth weak area, wherein the first weak area, the second weak area, the third weak area and the fourth weak area all comprise a vertical extension area connecting the first side edge and the second side edge and a horizontal extension area positioned at the first side edge or the second side edge, the vertical extension area is connected with the horizontal extension area, and the fifth weak area is positioned at the first side edge or the second side edge;
the area enclosed by the first weak area is the first pressure relief area, the area enclosed by the second weak area is the second pressure relief area, the area enclosed by the third weak area is the third pressure relief area, the area enclosed by the fourth weak area is the fourth pressure relief area, and the area enclosed by the fifth weak area is the fifth pressure relief area.
7. The header assembly of claim 6, wherein said laterally extending region of said first region of weakness, said laterally extending region of said second region of weakness, said laterally extending region of said third region of weakness, and said laterally extending region of said fourth region of weakness, and a fifth region of weakness are all located at said second side edge.
8. The header assembly of claim 2, wherein the pressure relief portion has a second direction at an angle to the first direction, the pressure relief portion having opposite first and second side edges along the second direction;
the plurality of weak areas comprise a first weak area, a second weak area, a third weak area, a fourth weak area and a fifth weak area, wherein the first weak area, the second weak area, the third weak area and the fourth weak area respectively comprise a first extending area positioned at the edge of the first side and a second extending area positioned at the edge of the second side, the fifth weak area is positioned at the edge of the first side or the edge of the second side, the area enclosed by the first weak area is the first pressure relief area, the area enclosed by the second weak area is the second pressure relief area, the area enclosed by the third weak area is the third pressure relief area, the area enclosed by the fourth weak area is the fourth pressure relief area, and the area enclosed by the fifth weak area is the fifth pressure relief area.
9. The header assembly of any one of claims 1-8, wherein a plurality of said areas of weakness are score lines, wherein the depth of the score of each of said areas of weakness is different.
10. The header assembly of claim 9, wherein the score of the weakened area has a depth d,25 μm +.d +.150 μm.
11. A battery, comprising:
a housing including a receiving cavity having an opening;
the battery cell is arranged in the accommodating cavity;
the cap assembly of any one of claims 1-10, wherein the cap assembly is capped to the opening.
12. An energy storage device comprising the battery of claim 11.
13. An electrical device comprising the energy storage device of claim 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311331794.5A CN117080671B (en) | 2023-10-16 | 2023-10-16 | Top cover assembly, battery, energy storage device and electricity utilization device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311331794.5A CN117080671B (en) | 2023-10-16 | 2023-10-16 | Top cover assembly, battery, energy storage device and electricity utilization device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117080671A CN117080671A (en) | 2023-11-17 |
| CN117080671B true CN117080671B (en) | 2024-01-26 |
Family
ID=88717551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311331794.5A Active CN117080671B (en) | 2023-10-16 | 2023-10-16 | Top cover assembly, battery, energy storage device and electricity utilization device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117080671B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114628845A (en) * | 2022-05-12 | 2022-06-14 | 比亚迪股份有限公司 | Battery, battery module, battery pack and vehicle |
| CN218351658U (en) * | 2022-10-24 | 2023-01-20 | 宁德时代新能源科技股份有限公司 | Battery monomer, battery and consumer |
| WO2023045672A1 (en) * | 2021-09-24 | 2023-03-30 | 宁德时代新能源科技股份有限公司 | End cover, end cover assembly, battery cell, battery, and electrical device |
| CN116207434A (en) * | 2023-05-06 | 2023-06-02 | 宁德时代新能源科技股份有限公司 | Pressure release part, battery monomer, battery and power consumption device |
| CN116565445A (en) * | 2023-07-12 | 2023-08-08 | 深圳海辰储能控制技术有限公司 | Explosion-proof valve, end cover assembly and energy storage device |
| CN116557596A (en) * | 2023-07-12 | 2023-08-08 | 深圳海辰储能控制技术有限公司 | Explosion-proof valve, end cover assembly, battery and energy storage device |
| CN116670921A (en) * | 2021-09-29 | 2023-08-29 | 宁德时代新能源科技股份有限公司 | Pressure release mechanism, battery cell, battery, power utilization device and manufacturing method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110400895B (en) * | 2019-07-30 | 2021-03-09 | 宁德时代新能源科技股份有限公司 | Battery module, secondary battery and top cover assembly thereof |
-
2023
- 2023-10-16 CN CN202311331794.5A patent/CN117080671B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023045672A1 (en) * | 2021-09-24 | 2023-03-30 | 宁德时代新能源科技股份有限公司 | End cover, end cover assembly, battery cell, battery, and electrical device |
| CN116670921A (en) * | 2021-09-29 | 2023-08-29 | 宁德时代新能源科技股份有限公司 | Pressure release mechanism, battery cell, battery, power utilization device and manufacturing method thereof |
| CN114628845A (en) * | 2022-05-12 | 2022-06-14 | 比亚迪股份有限公司 | Battery, battery module, battery pack and vehicle |
| CN218351658U (en) * | 2022-10-24 | 2023-01-20 | 宁德时代新能源科技股份有限公司 | Battery monomer, battery and consumer |
| CN116207434A (en) * | 2023-05-06 | 2023-06-02 | 宁德时代新能源科技股份有限公司 | Pressure release part, battery monomer, battery and power consumption device |
| CN116565445A (en) * | 2023-07-12 | 2023-08-08 | 深圳海辰储能控制技术有限公司 | Explosion-proof valve, end cover assembly and energy storage device |
| CN116557596A (en) * | 2023-07-12 | 2023-08-08 | 深圳海辰储能控制技术有限公司 | Explosion-proof valve, end cover assembly, battery and energy storage device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117080671A (en) | 2023-11-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN215578755U (en) | End cover, end cover assembly, battery monomer, battery and consumer | |
| KR20000009698A (en) | Current breaker of secondary battery | |
| KR100833737B1 (en) | Prismatic can type lithium ion rechargeable battery | |
| CN212571194U (en) | Secondary battery | |
| CN218632347U (en) | Insulating film, battery cell, battery and power consumption device | |
| CN212136523U (en) | High-safety large-capacity battery | |
| US20220328927A1 (en) | Battery, electric apparatus, and method and device for preparing battery | |
| CN115472997A (en) | Battery end cover assembly, energy storage device and electric equipment | |
| CN117080671B (en) | Top cover assembly, battery, energy storage device and electricity utilization device | |
| CN117239345B (en) | Electrochemical device and electric equipment | |
| CN115832596A (en) | Battery monomer | |
| WO2023217226A1 (en) | Battery cell, battery pack and vehicle | |
| WO2023217223A1 (en) | Battery cell, battery pack and vehicle | |
| CN218569132U (en) | Battery case, battery and battery pack | |
| CN218101464U (en) | Battery core and battery module | |
| CN217768663U (en) | Explosion-proof valve, electric core, lithium cell and vehicle | |
| CN217158534U (en) | Explosion-proof valve, battery cover plate and battery | |
| CN208570738U (en) | A kind of lithium ion battery that environment-friendly type is explosion-proof | |
| CN217606979U (en) | Battery pressure relief device | |
| EP4250443A1 (en) | Battery cover plate and lithium ion secondary battery | |
| CN212967853U (en) | Top cover assembly, single battery and power battery | |
| CN2805102Y (en) | Suare shaped lithium ion cell | |
| CN220291011U (en) | Pressure release part, battery monomer, battery and consumer | |
| CN218101597U (en) | Power battery | |
| CN218975703U (en) | Edge sealing structure of lithium battery |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |