An explosion-proof combined valve, top cover and battery

Abstract

The present invention belongs to the technical field of batteries, and specifically relates to an explosion-proof combination valve, comprising an explosion-proof chamber (1) provided with a through hole (11); an outer explosion-proof plate (2) provided above the through hole (11); an inner explosion-proof plate (3) provided below the through hole (11); the explosion-proof chamber (1), the outer explosion-proof plate (2) and the inner explosion-proof plate (3) form a closed space for accommodating explosion-proof materials, the closed space contains explosion-proof materials, and the inner explosion-proof plate (3) ruptures under set conditions to release the explosion-proof materials into the battery. The present invention can slow down the thermal runaway inside the battery and improve the safety of the battery. In addition, the present invention also discloses a top cover and a battery.

Description

Technical Field

[0001] The invention belongs to the technical field of batteries, and in particular relates to an explosion-proof combined valve, a top cover and a battery. Background Art

[0002] Nowadays, all countries are vigorously developing green and efficient secondary batteries. As a new type of secondary battery, lithium-ion batteries have the advantages of high energy density and power density, high operating voltage, light weight, small size, long cycle life, good safety, and green environmental protection. They have broad application prospects in portable appliances, power tools, large energy storage, and electric transportation power sources. In current power batteries, if the battery is abused or used incorrectly, it is likely to produce gas, a large amount of heat or other substances inside, and even explode. In addition, before the battery becomes abnormal, if the battery is overcharged, discharged, short-circuited, high temperature, acupuncture, etc., the internal pressure gradually increases. If the battery does not immediately slow down or stop the deterioration of the process, the battery is likely to spit fire or explode, and transfer a large amount of heat to the outside, that is, thermal runaway occurs. Therefore, the existing top cover uses an explosion-proof valve structure.

[0003] Existing explosion-proof valves have the following defects: they adopt a single-layer membrane structure, the explosion-proof structure is relatively simple and has a single function, and only one membrane covers the reserved hole; they can only exhaust in one direction and cannot slow down or prevent the occurrence of thermal runaway. Summary of the invention

[0004] One of the purposes of the present invention is to provide an explosion-proof combination valve to alleviate the thermal runaway inside the battery and improve the safety of the battery in view of the deficiencies in the prior art.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] An explosion-proof combination valve comprises an explosion-proof cavity provided with a through hole; an outer explosion-proof sheet provided above the through hole; and an inner explosion-proof sheet provided below the through hole; the explosion-proof cavity, the outer explosion-proof sheet and the inner explosion-proof sheet form a closed space for accommodating explosion-proof materials, the closed space contains explosion-proof materials, and the inner explosion-proof sheet ruptures under set conditions to release the explosion-proof materials into a battery.

[0007] As an improvement of the explosion-proof combination valve described in the present invention, the inner explosion-proof disc is provided with at least one rupture zone, and the rupture zone ruptures under a set temperature and / or pressure.

[0008] As an improvement of the explosion-proof combination valve described in the present invention, the thickness of the rupture zone is thinner than the thickness of other parts of the inner explosion-proof disc, so that the rupture zone of the inner explosion-proof disc ruptures when the set temperature and / or pressure is reached.

[0009] As an improvement of the explosion-proof combination valve described in the present invention, a bursting structure is provided in the explosion-proof cavity, and the bursting structure can puncture the inner explosion-proof disk under a set temperature and / or pressure.

[0010] As an improvement of the explosion-proof combination valve described in the present invention, the breaking structure includes a fixing frame and at least one punching knife / punching needle, and the fixing frame is installed in the explosion-proof cavity / is integrally formed with the explosion-proof cavity.

[0011] As an improvement of the explosion-proof combination valve described in the present invention, the fixed frame is a frame, and the frame includes a cross bar, a longitudinal bar and an outer frame. At least one punch is arranged on the cross bar, the longitudinal bar or the intersection of the cross bar and the longitudinal bar, and the punch is arranged in the middle of the cross bar.

[0012] As an improvement of the explosion-proof combination valve described in the present invention, the fixing frame is a support beam, at least one punching knife is arranged on the support beam, and the punching knife is arranged in the middle part of the support beam.

[0013] As an improvement of the explosion-proof combination valve described in the present invention, when the materials of the inner explosion-proof piece and the outer explosion-proof piece are the same, the thickness of the inner explosion-proof piece is less than the thickness of the outer explosion-proof piece, and the thickness of the inner explosion-proof piece and the thickness of the outer explosion-proof piece are both 0.01mm-0.5mm; when the materials of the inner explosion-proof piece and the outer explosion-proof piece are different, the tensile strength of the inner explosion-proof piece is less than the tensile strength of the outer explosion-proof piece.

[0014] As an improvement of an explosion-proof combination valve described in the present invention, an outer protective sheet is provided on the top surface of the outer explosion-proof sheet, and / or an inner protective sheet is provided on the bottom surface of the inner explosion-proof sheet, the coverage area of ​​the inner protective sheet is greater than or equal to the coverage area of ​​the inner explosion-proof sheet, the area of ​​the outer protective sheet is equal to the coverage area of ​​the outer explosion-proof sheet, the material of the inner protective sheet and the outer protective sheet is plastic material, and the thickness of the inner protective sheet and the outer protective sheet is 0.01mm-2.0mm.

[0015] As an improvement of the explosion-proof combination valve described in the present invention, the top of the through hole forms a first groove and a second groove in sequence, the outer explosion-proof plate is accommodated in the first groove, the outer protective plate is accommodated in the second groove, and the bottom of the through hole forms a third groove, and the inner explosion-proof plate is accommodated in the third groove.

[0016] As an improvement of the explosion-proof combination valve described in the present invention, the explosion-proof material is at least one of gaseous hexafluoropropane, gaseous heptafluoropropane, liquid perfluorohexane, liquid perfluorohexanone, aerosol, carbon dioxide, ammonium perfluorooctanoate, ethoxypentafluorocyclotriphosphazene, and tris(2,2,2-trifluoroethyl) phosphate.

[0017] The second object of the present invention is to provide a top cover, including a top cover sheet; a pole installed on the top cover sheet; as the above-mentioned explosion-proof combination valve, the explosion-proof combination valve is arranged on the top cover sheet; the top cover sheet is provided with at least one of an explosion-proof valve hole and an injection hole, the explosion-proof combination valve is welded to the explosion-proof valve hole, or the explosion-proof combination valve and the top cover sheet are an integrated structure, or the explosion-proof cavity and the top cover sheet are an integrated structure.

[0018] The third object of the present invention is to provide a battery, comprising a shell provided with an opening; a battery cell accommodated in the shell; and a top cover such as the above, wherein a top cover sheet is fixed to the opening to enclose the battery cell in the shell.

[0019] The beneficial effect of the present invention is that the present invention includes an explosion-proof cavity, which is provided with a through hole; an outer explosion-proof plate, which is provided above the through hole; and an inner explosion-proof plate, which is provided below the through hole; the explosion-proof cavity, the outer explosion-proof plate and the inner explosion-proof plate form a closed space for accommodating explosion-proof materials, the closed space contains explosion-proof materials, and the inner explosion-proof plate ruptures under set conditions to release the explosion-proof materials into the battery. Due to the following defects of the existing explosion-proof valves: a single-layer membrane structure is adopted, the explosion-proof structure is relatively simple and has a single function, and only one membrane covers the reserved hole; it can only exhaust in one direction, and cannot slow down or prevent the occurrence of thermal runaway, therefore, an outer explosion-proof plate is provided above the through hole of the explosion-proof cavity, and an inner explosion-proof plate is provided below the through hole of the explosion-proof cavity, and the explosion-proof cavity, the outer explosion-proof plate and the inner explosion-proof plate form a closed space for accommodating explosion-proof materials, the closed space contains explosion-proof materials, and the inner explosion-proof plate ruptures under set conditions, Release the explosion-proof material into the battery. Before the battery becomes abnormal or has thermal runaway, the internal pressure or temperature of the battery is high, causing the inner explosion-proof plate to bulge outward. When the bursting pressure of the inner explosion-proof plate is reached, the inner explosion-proof plate ruptures, and the explosion-proof material enters the battery, which helps to slow down the thermal runaway of the battery. When the abnormality of the battery is further aggravated, the outer explosion-proof plate bulges outward. When the bursting pressure of the outer explosion-proof plate is reached, the outer explosion-proof plate ruptures, causing the internal pressure of the battery to decrease sharply, that is, through two-stage explosion protection, the effect of pressure relief and explosion protection is achieved. The present invention can slow down the thermal runaway inside the battery and improve the safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Features, advantages, and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0021] Figure 1 It is a structural schematic diagram of implementation mode 1 of the present invention.

[0022] Figure 2 It is a schematic diagram of the decomposition of the first embodiment of the present invention.

[0023] Figure 3It is a schematic diagram of the exploded side of the first embodiment of the present invention.

[0024] Figure 4 It is a structural schematic diagram of the bottom surface of the explosion-proof chamber in implementation mode 1 of the present invention.

[0025] Figure 5 It is a schematic diagram of the decomposition of the second embodiment of the present invention.

[0026] Figure 6 It is a schematic diagram of the exploded side of the second embodiment of the present invention.

[0027] Figure 7 It is a top view of the breaking structure of the second embodiment of the present invention.

[0028] Figure 8 It is a bottom view of the breakthrough structure of the second embodiment of the present invention.

[0029] Fig. 9 This is a schematic diagram of the decomposition of the third embodiment of the present invention.

[0030] Fig.10 It is a schematic diagram of the decomposition of the fourth embodiment of the present invention.

[0031] Fig.11 It is a structural schematic diagram of implementation mode 5 of the present invention.

[0032] Fig.12 It is a schematic diagram of the side structure of the fifth embodiment of the present invention.

[0033] Fig.13 This is a schematic diagram of the decomposition of the fifth embodiment of the present invention.

[0034] Fig.14 This is a schematic diagram of the decomposition of the sixth embodiment of the present invention.

[0035] Fig.15 It is a structural schematic diagram of implementation mode 7 of the present invention.

[0036] Fig.16 It is a schematic diagram of the decomposition of the seventh embodiment of the present invention.

[0037] Fig.17 It is a schematic diagram of the exploded side of the seventh embodiment of the present invention.

[0038] The reference numerals are described as follows:

[0039] 1-explosion-proof chamber; 11-through hole; 111-first groove; 112-second groove; 113-third groove;

[0040] 2-External explosion-proof disk;

[0041] 3-Internal explosion-proof disk;

[0042] 4-breaking structure; 41-frame; 42-punch; 411-crossbar; 412-longitudinal bar; 413-outer frame; 401-support beam; 403-card plate;

[0043] 5-Inner protection sheet;

[0044] 6-Outer protective sheet;

[0045] 7-top cover sheet; 71-explosion-proof valve hole; 72-liquid injection hole;

[0046] 8-Pole;

[0047] 9- Shell. DETAILED DESCRIPTION

[0048] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0049] Furthermore, the terms “first”, “second”, etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0050] In the invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to specific circumstances.

[0051] The following is combined with Figures 1 to 17 The present invention is further described in detail, but is not intended to limit the present invention.

[0052] Implementation Method 1

[0053] An explosion-proof combination valve comprises an explosion-proof chamber 1, which is provided with a through hole 11; an outer explosion-proof disc 2, which is arranged above the through hole 11; and an inner explosion-proof disc 3, which is arranged below the through hole 11. The explosion-proof chamber 1, the outer explosion-proof disc 2 and the inner explosion-proof disc 3 form a closed space for accommodating explosion-proof materials, and the closed space contains explosion-proof materials. The inner explosion-proof disc 3 ruptures under set conditions to release the explosion-proof materials into a battery.

[0054] The existing explosion-proof valve has the following defects: it adopts a single-layer membrane structure, the explosion-proof structure is relatively simple and has a single function, and only one membrane covers the reserved hole; it can only exhaust in one direction and cannot slow down or prevent the occurrence of thermal runaway. Therefore, see Figures 1 to 4 As shown, an outer explosion-proof sheet 2 is arranged above the through hole 11 of the explosion-proof cavity 1, and an inner explosion-proof sheet 3 is arranged below the through hole 11 of the explosion-proof cavity 1, and the explosion-proof cavity 1, the outer explosion-proof sheet 2 and the inner explosion-proof sheet 3 form a closed space for accommodating explosion-proof materials, and the closed space contains explosion-proof materials. The inner explosion-proof sheet 3 ruptures under set conditions to release the explosion-proof materials into the battery. Before the battery becomes abnormal or thermal runaway, the internal pressure or temperature of the battery is relatively high, so that the inner explosion-proof sheet 3 bulges outwards. When the bursting pressure of the inner explosion-proof sheet 3 is reached, the inner explosion-proof sheet 3 ruptures, and the explosion-proof materials enter the battery, which helps to slow down the thermal runaway of the battery. When the abnormality of the battery is further aggravated, the outer explosion-proof sheet 2 bulges outwards. When When the bursting pressure of the outer explosion-proof sheet 2 is reached, the outer explosion-proof sheet 2 ruptures, causing the internal pressure of the battery to decrease sharply, that is, through two-stage explosion protection, the effect of pressure relief and explosion protection is achieved; wherein, the outer explosion-proof sheet 2 and the inner explosion-proof sheet 3 are both thin film structures, which can form a sealed accommodating cavity with the explosion-proof cavity 1, preferably aluminum-plastic film, metal foil, polymer film or mixed composite material, and the connection method between the outer explosion-proof sheet 2 and the inner explosion-proof sheet 3 and the explosion-proof cavity 1 includes but is not limited to laser welding, adhesive bonding, adhesive and laser welding, or other welding methods, preferably laser welding. In addition, when the explosion-proof material enters the interior of the battery, it mainly plays the functions of heat insulation, flame retardancy, fire extinguishing, etc., effectively inhibiting thermal runaway or damage of the battery.

[0055] In this embodiment, the explosion-proof cavity 1, the outer explosion-proof plate 2 and the inner explosion-proof plate 3 can be pre-assembled into an integral structure, and then the explosion-proof combination valve can be installed on the top cover plate 7. The explosion-proof cavity 1 can also be pre-installed on the top cover plate 7 alone, or the explosion-proof cavity 1 and the top cover plate 7 can be made into an integral structure, which can meet the normal operation of the explosion-proof combination valve. The inner explosion-proof plate 3 allows the explosion-proof material to enter the battery by rupture, and the rupture mode is self-rupture. Among them, the inner explosion-proof plate 3 is provided with at least one rupture zone, and the rupture zone ruptures at a set temperature and / or pressure. The thickness of the rupture zone is thinner than the thickness of other parts of the inner explosion-proof plate 3, so that the inner explosion-proof plate 3 ruptures in the rupture zone when the set temperature and / or pressure are reached.

[0056] In the explosion-proof combination valve according to the present invention, when the materials of the inner explosion-proof disc 3 and the outer explosion-proof disc 2 are the same, the thickness of the inner explosion-proof disc 3 is less than the thickness of the outer explosion-proof disc 2, and the thickness of the inner explosion-proof disc 3 and the thickness of the outer explosion-proof disc 2 are both 0.01mm-0.5mm; when the materials of the inner explosion-proof disc 3 and the outer explosion-proof disc 2 are different, the tensile strength of the inner explosion-proof disc 3 is less than the tensile strength of the outer explosion-proof disc 2. In order to allow the inner explosion-proof disc 3 to reach the bursting pressure faster, the explosion-proof material can enter the battery to prevent the outer explosion-proof disc 2 from rupturing earlier than the inner explosion-proof disc 3, resulting in partial leakage of the explosion-proof material. Among them, when the materials are different, it is not necessarily necessary for the thickness of the inner explosion-proof disc 3 to be less than that of the outer explosion-proof disc 2, and the inner explosion-proof disc can also be ruptured or opened first. For example, the structure of aluminum-plastic film is a very thin aluminum foil with a plastic layer on the surface. The total thickness includes the thickness of the aluminum foil and the thickness of the plastic. The tensile strength of the plastic is lower than that of the aluminum foil, and in terms of high temperature resistance, the plastic is also much lower than aluminum. Before the battery experiences thermal runaway, the internal pressure is high and the temperature is also high.

[0057] In the explosion-proof combination valve according to the present invention, the thickness of the inner explosion-proof disc 3 and the thickness of the outer explosion-proof disc 2 are both 0.01 mm. The thickness of the inner explosion-proof disc 3 and the thickness of the outer explosion-proof disc 2 are limited to the minimum value to prevent the thickness of the inner explosion-proof disc 3 and the thickness of the outer explosion-proof disc 2 from being too small, resulting in a decrease in the mechanical strength of the inner explosion-proof disc 3 and the outer explosion-proof disc 2, which is not conducive to extending the service life of the explosion-proof combination valve.

[0058] In the explosion-proof combination valve according to the present invention, the top surface of the outer explosion-proof disc 2 is provided with an outer protective sheet 6, and the bottom surface of the inner explosion-proof disc 3 is provided with an inner protective sheet 5, the coverage area of ​​the inner protective sheet 5 is greater than or equal to the coverage area of ​​the inner explosion-proof disc 3, the area of ​​the outer protective sheet 6 is equal to the coverage area of ​​the outer explosion-proof disc 2, the material of the inner protective sheet 5 and the outer protective sheet 6 is plastic material, and the thickness of the inner protective sheet 5 and the outer protective sheet 6 is 0.01mm-2.0mm. Adding the inner protective sheet 5 and the outer protective sheet 6 not only prevents the inner explosion-proof disc 3 and the outer explosion-proof disc 2 from being scratched or pierced by other external objects, but also plays a buffering role, wherein the thickness of the inner protective sheet 5 and the outer protective sheet 6 can be 0.01mm-0.5mm, or 0.1mm-2.0mm, the material of the inner protective sheet 5 and the outer protective sheet 6 is PET, PP, PE and other plastics, and the connection method between the inner protective sheet 5 and the cavity wall of the explosion-proof cavity 1 includes but is not limited to applying glue on the bottom plane of the cavity wall of the explosion-proof cavity 1 or setting the protective sheet back glue. Among them, the outer protection sheet 6 is a relatively fragile explosion-proof sheet that is easily damaged by mistake when the battery contacts the outside; in addition, the protection sheet, a plastic mesh structure, can also be integrated into the bottom plastic sheet of the top cover sheet. The area of ​​the mesh structure protection sheet is only a smaller area, not necessarily larger than the area of ​​the explosion-proof sheet, but the total area of ​​the mesh protection sheet includes the area of ​​the mesh and the area of ​​the holes in the mesh.

[0059] In the explosion-proof combination valve according to the present invention, the coverage area of ​​the inner protection sheet 5 is greater than or equal to the coverage area of ​​the inner explosion-proof sheet 3, and can cover the entire inner explosion-proof sheet 3, thereby preventing the inner explosion-proof sheet 3 from being scratched or punctured by other external objects, and reducing the probability of leakage of the explosion-proof material during normal operation.

[0060] In the explosion-proof combination valve according to the present invention, see Figure 4 As shown, a third groove 113 is formed at the bottom of the through hole 11, and the inner explosion-proof disc 3 is accommodated in the third groove 113. Through the third groove 113, the inner explosion-proof disc 3 can be embedded into the bottom of the explosion-proof cavity 1, which not only prevents the inner explosion-proof disc 3 from being scratched by external objects, but also fixes the position of the inner explosion-proof disc 3 to prevent the inner explosion-proof disc 3 from being displaced or shaken. At the same time, it helps to reduce the overall height of the explosion-proof combination valve, thereby improving the space utilization rate of the battery.

[0061] In the explosion-proof combination valve according to the present invention, the explosion-proof material is a coolant, an electrolyte additive or a fire extinguishing agent. Specifically, the explosion-proof material is at least one of a coolant, an electrolyte additive and a fire extinguishing agent, preferably: gaseous heptafluoropropane, gaseous hexafluoropropane, liquid perfluorohexane, liquid perfluorohexanone, aerosol (KNO3, Sr(NO3)2 or strontium compound), liquid or gaseous carbon dioxide, ammonium perfluorooctanoate, ethoxy pentafluorocyclotriphosphazene, tris(2,2,2-trifluoroethyl) phosphate, but the present invention is not limited thereto, and other explosion-proof materials can be used according to actual cost and battery structure requirements to meet cooling, fire extinguishing or flame retardant effects.

[0062] The working principle of the present invention is:

[0063] An outer explosion-proof sheet 2 is arranged above the through hole 11 of the explosion-proof cavity 1, and an inner explosion-proof sheet 3 is arranged below the through hole 11 of the explosion-proof cavity 1, and the explosion-proof cavity 1, the outer explosion-proof sheet 2 and the inner explosion-proof sheet 3 form a closed space for accommodating explosion-proof materials, and the closed space contains explosion-proof materials. The inner explosion-proof sheet 3 ruptures under set conditions to release the explosion-proof materials into the battery. Before the battery is abnormal or thermal runaway occurs, the internal pressure of the battery is relatively large or the temperature is relatively high, so that the inner explosion-proof sheet 3 bulges outwards. When the bursting pressure of the inner explosion-proof sheet 3 is reached, the inner explosion-proof sheet 3 ruptures, and the explosion-proof material enters the battery, which helps to slow down the thermal runaway of the battery; when the abnormality of the battery is further aggravated, the outer explosion-proof sheet 2 bulges outwards. When the bursting pressure of the outer explosion-proof sheet 2 is reached, the outer explosion-proof sheet 2 ruptures, so that the internal pressure of the battery is sharply reduced, that is, the two-stage explosion-proof is used to achieve the effect of pressure relief and explosion-proof.

[0064] Implementation Method 2

[0065] See also Figures 5 to 8As shown, the difference from the first embodiment is that a bursting structure 4 is provided in the explosion-proof cavity 1 of the present embodiment, and the bursting structure 4 can puncture the inner explosion-proof plate 3 at a set temperature and / or pressure, and the bursting structure 4 includes a fixing frame and at least one punching knife 42 / punching needle, and the fixing frame is installed in the explosion-proof cavity 1 / is formed integrally with the explosion-proof cavity 1, and the fixing frame is a frame 41, and the frame 41 includes a cross bar 411, a longitudinal bar 412 and an outer frame 413, and at least one punching knife 42 is arranged at the cross bar 411, the longitudinal bar 412 or the intersection of the cross bar 42 and the longitudinal bar 412, and the punching knife 42 is arranged in the middle of the cross bar 411, and the coverage area of ​​the outer protective plate 6 is equal to the coverage area of ​​the outer explosion-proof plate 2, and the thickness of the inner explosion-proof plate 3 and the thickness of the outer explosion-proof plate 2 are both 0.5 mm, and the top of the through hole 11 forms a first groove 111 and a second groove 112 in sequence, and the outer explosion-proof plate 2 is accommodated in the first groove 111, and the outer protective plate 6 is accommodated in the second groove 112. Before the battery is abnormal or thermal runaway occurs, the internal pressure of the battery is relatively large or the temperature is relatively high, so that the inner explosion-proof plate 3 bulges outward, and the rupture structure 4 contacts the inner explosion-proof plate 3. The punching knife 42 on the rupture structure 4 can pierce the inner explosion-proof plate 3, so that the explosion-proof material enters the battery, which helps to slow down the thermal runaway of the battery. The cross bar 411, the longitudinal bar 412 and the outer frame 413 form an integrated frame 41 structure, which plays a role in fixing the position of the punching knife 42 in the explosion-proof cavity 1. The punching knife 42 can be one or more, and the distribution position can be in the middle or in different positions, preferably in the middle. Among them, the frame 41 and the punching knife 42 can be installed in the explosion-proof cavity 1, or be integrally formed with the explosion-proof cavity 1, which can improve the overall strength of the explosion-proof valve and reduce the production cost. Both can be metal or non-metal. The punching knife 42 can be set as other sharp objects with sharp protrusions, but the present invention is not limited to this. It only needs to meet the structure of piercing the inner explosion-proof plate 3; by The top of the hole 11 forms a first groove 111 and a second groove 112 in sequence, so that the outer protective sheet 6 is arranged on the top surface of the outer explosion-proof sheet 2, and the coverage area of ​​the outer protective sheet 6 is equal to the coverage area of ​​the outer explosion-proof sheet 2, which plays a role in protecting the outer explosion-proof sheet 2. At the same time, through the first groove 111 and the second groove 112, the outer explosion-proof sheet 2 and the outer protective sheet 6 can be embedded into the top of the explosion-proof cavity 1, which not only prevents external objects from scratching the outer explosion-proof sheet 2, but also fixes the position of the outer explosion-proof sheet 2 to prevent the outer explosion-proof sheet 2 from displacement or shaking, and helps to reduce the overall height of the explosion-proof combination valve, thereby improving the space utilization rate of the battery; the thickness of the inner explosion-proof sheet 3 and the thickness of the outer explosion-proof sheet 2 are limited to the maximum value to prevent the thickness of the inner explosion-proof sheet 3 and the thickness of the outer explosion-proof sheet 2 from being too large, resulting in the thickness of the inner explosion-proof sheet 3 and the outer explosion-proof sheet 2 being not easy to explode when bulging, affecting the release of the explosion-proof material, which is not conducive to slowing down the thermal runaway of the battery.

[0066] The other structures are the same as those in the first embodiment and will not be described in detail here.

[0067] Implementation Method 3

[0068] See also Fig. 9 As shown, the difference from the first embodiment is that the fixing frame of this embodiment is a support beam 401, and at least one punch 42 is arranged on the support beam 401. Preferably, the punch 42 is arranged in the middle of the support beam 401, and the thickness of the inner explosion-proof plate 3 and the thickness of the outer explosion-proof plate 2 are both 0.25 mm. Before the battery becomes abnormal or thermal runaway, the internal pressure of the battery is relatively large or the temperature is relatively high, causing the inner explosion-proof plate 3 to bulge outward, and the rupture structure 4 contacts the inner explosion-proof plate 3. The punch 42 on the rupture structure 4 can pierce the inner explosion-proof plate 3, allowing the explosion-proof material to enter the battery, which helps to slow down the thermal runaway of the battery. The support beam 401 cooperates with the clamping plates 403 at both ends to clamp the support beam 401 at a preset position in the explosion-proof chamber 1. Specifically, the clamping plates 403 at both ends of the support beam 401 are perpendicular to the support beam 401 and abut against the inner wall of the explosion-proof chamber 1, so as to fix the position of the punch 42 in the explosion-proof chamber 1. The punch 42 can be one or more, and the distribution position can be In the middle, or in different positions, preferably in the middle, wherein the support beam 401 and the punch 42 can be installed in the explosion-proof cavity, or integrally formed with the explosion-proof cavity, which can improve the overall strength of the explosion-proof valve and reduce production costs. Both can be metal or non-metal, and the punch 42 can be set to other sharp objects with sharp protrusions, but the present invention is not limited to this, as long as the structure of piercing the inner explosion-proof plate 3 is met; the thickness of the inner explosion-proof plate 3 and the thickness of the outer explosion-proof plate 2 are limited to the intermediate value, which satisfies the inner explosion-proof plate 3 and the outer explosion-proof plate 2. It has a certain mechanical strength and can also be blasted normally, which is conducive to the normal release of the explosion-proof material, thereby slowing down the thermal runaway of the battery.

[0069] The other structures are the same as those in the second embodiment and will not be described again here.

[0070] Implementation Method 4

[0071] A top cover comprises a top cover sheet 7; a pole 8, mounted on the top cover sheet 7; as in the explosion-proof combination valve of the first embodiment, the explosion-proof combination valve is arranged on the top cover sheet 7; the top cover sheet 7 is provided with at least one of an explosion-proof valve hole 71 and a liquid injection hole 72, and the explosion-proof combination valve is welded to the explosion-proof valve hole 71.

[0072] It should be noted that: See Fig.10 As shown, the connection methods of the explosion-proof combination valve and the top cover sheet 7 include but are not limited to laser welding or argon arc welding, and laser welding is preferably used. The top cover sheet 7 is an integrated structure. The position of the explosion-proof valve hole 71 can be reserved before the top cover sheet 7 is formed, or the explosion-proof valve hole 71 can be formed by drilling or milling after the top cover sheet 7 is formed, and then the explosion-proof combination valve is installed in the explosion-proof valve hole 71. The shape and size of the explosion-proof valve hole 71 can be determined according to the actual shape of the explosion-proof combination valve. In addition, the explosion-proof combination valve can be assembled in advance, which helps to improve the production efficiency of the battery. The edge of the top of the explosion-proof cavity 1 forms a plane for laser penetration welding.

[0073] There are two poles 8 in the battery for outputting electric energy to the outside, one is a positive pole and the other is a negative pole. The battery in this embodiment has two poles, namely a first pole and a second pole, both of which are arranged on the top cover sheet 7. The first pole can be a positive pole or a negative pole, and correspondingly, the second pole is a negative pole or a positive pole.

[0074] Implementation Method 5

[0075] A top cover comprises a top cover sheet 7; a pole 8 mounted on the top cover sheet 7; as in the second embodiment of the explosion-proof combination valve, the explosion-proof combination valve is arranged on the top cover sheet 7, and the explosion-proof combination valve and the top cover sheet 7 are an integrated structure.

[0076] It should be noted that: See Figures 11 to 13 As shown, according to actual production requirements, the explosion-proof combination valve and the top cover sheet 7 can be designed as an integrated structure, eliminating the need to assemble the explosion-proof combination valve and the top cover sheet 7, which helps to improve the production efficiency of the battery.

[0077] Implementation Method 6

[0078] A top cover comprises a top cover sheet 7; a pole 8 mounted on the top cover sheet 7; as in the explosion-proof combination valve of the third embodiment, the explosion-proof combination valve is arranged on the top cover sheet 7, and the explosion-proof cavity 1 and the top cover sheet 7 are an integrated structure.

[0079] It should be noted that see Fig.14 As shown, the explosion-proof cavity 1 and the top cover sheet 7 can be integrally stamped, or the explosion-proof cavity 1 and the top cover sheet 7 can be pre-welded into one piece. According to the actual battery structure, the explosion-proof cavity 1 can be formed into a bulge inside the battery, or it can be formed into a bulge outside the battery. Then the inner explosion-proof sheet 3 is installed, and the explosion-proof material is injected and the burst structure 4 is placed. Then the outer explosion-proof sheet 2 is connected and sealed to the explosion-proof cavity 1. Finally, the inner protective sheet 5 and the outer protective sheet 6 are installed to complete the assembly of the top cover sheet 7 with the explosion-proof combination valve.

[0080] Implementation Method 7

[0081] A battery comprises a shell 9 provided with an opening; a battery cell accommodated in the shell 9; and a top cover such as the top cover of the fourth embodiment, wherein a top cover sheet 7 is fixed to the opening to seal the battery cell in the shell 9.

[0082] It should be noted that: See Figures 15 to 17As shown, the shell 9 is an integrated structure or a split structure, and can be made of metals such as steel, aluminum, and aluminum alloy, preferably aluminum. The shell 9 includes a bottom plate and four substrates, and the four substrates are connected in sequence. The bottoms of the four substrates are all connected to the bottom plate, and openings are formed on the tops of the four substrates. The top cover sheet 7 is installed in the opening. The top cover sheet 1 and the shell 9 can be connected together by welding or the like to form an external structure of a power battery with higher safety and better sealing effect.

[0083] Implementation Method 8

[0084] A battery comprises a shell 9 provided with an opening; a battery cell accommodated in the shell 9; and a top cover as in the fifth embodiment, wherein a top cover sheet 7 is fixed to the opening to seal the battery cell in the shell 9.

[0085] It should be noted that: the battery cell includes a positive electrode sheet, a separator and a negative electrode sheet, which can be stacked and wound in sequence. The positive electrode sheet includes a positive electrode collector and a positive electrode active material coated on the surface of the positive electrode collector. The negative electrode sheet includes a negative electrode collector and a negative electrode active material coated on the surface of the negative electrode collector. The first pole ear is connected to the positive electrode collector, and the second pole ear is connected to the negative electrode collector. The edge of the positive electrode collector may have a blank area not covered by the positive electrode active material. The first pole ear can be directly formed by cutting the blank area. Similarly, the second pole ear can be directly formed by cutting the blank area of ​​the negative electrode collector. In addition, the first pole ear and the second pole ear can also be fixed to the blank areas of the positive electrode sheet and the negative electrode sheet respectively by welding. Laser welding can be used to connect the first pole ear to the first pole column and the second pole ear to the second pole column.

[0086] Implementation Method 9

[0087] A battery comprises a shell 9 provided with an opening; a battery cell accommodated in the shell 9; and a top cover as in the sixth embodiment, wherein a top cover sheet 7 is fixed to the opening to seal the battery cell in the shell 9.

[0088] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs can also change and modify the above embodiment. Therefore, the present invention is not limited to the above specific embodiment, and any obvious improvement, replacement or modification made by those skilled in the art on the basis of the present invention belongs to the protection scope of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. An explosion-proof combination valve, characterized in that: include: An explosion-proof chamber (1) is provided with a through hole (11); An external explosion-proof disk (2) is arranged above the through hole (11); An inner explosion-proof disk (3) is arranged below the through hole (11); The inner explosion-proof disc (3) and the outer explosion-proof disc (2) are thin film structures made of the same or different materials; When the inner explosion-proof sheet (3) and the outer explosion-proof sheet (2) are made of the same material, the thickness of the inner explosion-proof sheet (3) is smaller than the thickness of the outer explosion-proof sheet (2), and the thickness of the inner explosion-proof sheet (3) and the thickness of the outer explosion-proof sheet (2) are both 0.01 mm-0.5 mm; when the inner explosion-proof sheet (3) and the outer explosion-proof sheet (2) are made of different materials, the tensile strength of the inner explosion-proof sheet (3) is smaller than the tensile strength of the outer explosion-proof sheet (2); The explosion-proof cavity (1), the outer explosion-proof disk (2) and the inner explosion-proof disk (3) form a closed space for accommodating explosion-proof materials, and the explosion-proof materials are contained in the closed space; The inner explosion-proof sheet (3) ruptures under set conditions to release explosion-proof materials into the battery; The inner explosion-proof disk (3) is provided with at least one rupture zone, and the rupture zone ruptures at a set temperature and / or pressure; The explosion-proof cavity (1) is provided with a puncturing structure (4), and the puncturing structure (4) is capable of puncturing the inner explosion-proof disk (3) at a set temperature and / or pressure; The piercing structure (4) comprises a fixing frame and at least one punching knife (42) / punching needle, and the fixing frame is installed in the explosion-proof chamber (1) / is formed integrally with the explosion-proof chamber (1).

2. An explosion-proof combination valve according to claim 1, characterized in that: The thickness of the rupture zone is thinner than that of other parts of the inner bursting disk (3), so that the rupture zone of the inner bursting disk (3) ruptures when a set temperature and / or pressure is reached.

3. An explosion-proof combination valve according to claim 1, characterized in that: The fixing frame is a frame (41), and the frame (41) includes a cross bar (411), a longitudinal bar (412) and an outer frame (413). At least one punching knife (42) is arranged on the cross bar (411), the longitudinal bar (412) or at the intersection of the cross bar (42) and the longitudinal bar (412), and the punching knife (42) is arranged in the middle of the cross bar (411).

4. An explosion-proof combination valve according to claim 1, characterized in that: The fixing frame is a support beam (401), at least one punching knife (42) is arranged on the support beam (401), and the punching knife (42) is arranged in the middle of the support beam (401).

5. The explosion-proof combination valve according to claim 1, characterized in that: The top surface of the outer explosion-proof plate (2) is provided with an outer protective plate (6), and / or the bottom surface of the inner explosion-proof plate (3) is provided with an inner protective plate (5), the coverage area of ​​the inner protective plate (5) is greater than or equal to the coverage area of ​​the inner explosion-proof plate (3), the area of ​​the outer protective plate (6) is equal to the coverage area of ​​the outer explosion-proof plate (2), the material of the inner protective plate (5) and the outer protective plate (6) is plastic material, and the thickness of the inner protective plate (5) and the outer protective plate (6) is 0.01mm-2.0mm.

6. An explosion-proof combination valve according to claim 5, characterized in that: The top of the through hole (11) is formed with a first groove (111) and a second groove (112) in sequence, the outer explosion-proof disc (2) is accommodated in the first groove (111), the outer protective disc (6) is accommodated in the second groove (112), and the bottom of the through hole (11) is formed with a third groove (113), the inner explosion-proof disc (3) is accommodated in the third groove (113).

7. The explosion-proof combination valve according to claim 1, characterized in that: The explosion-proof material is at least one of gaseous hexafluoropropane, gaseous heptafluoropropane, liquid perfluorohexane, liquid perfluorohexanone, aerosol, carbon dioxide, ammonium perfluorooctanoate, ethoxy pentafluorocyclotriphosphazene, and tris(2,2,2-trifluoroethyl) phosphate.

8. A top cover, characterized in that: include: Top cover sheet (7); A pole (8) mounted on the top cover sheet (7); The explosion-proof combination valve according to any one of claims 1 to 7, wherein the explosion-proof combination valve is arranged on the top cover sheet (7); the top cover sheet (7) is provided with at least one of an explosion-proof valve hole (71) and a liquid injection hole (72), the explosion-proof combination valve is welded to the explosion-proof valve hole (71), or the explosion-proof combination valve and the top cover sheet (7) are an integrated structure, or the explosion-proof cavity (1) and the top cover sheet (7) are an integrated structure.

9. A battery, characterized in that: include: A housing (9) having an opening; A battery cell, housed in the housing (9); The top cover as claimed in claim 8, wherein a top cover sheet (7) is fixed to the opening to seal the battery cell in the housing (9).

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