Battery and electric equipment
By designing an insulating layer and a pressure relief mechanism in the battery, the problems of fire and explosion during thermal runaway are solved, achieving higher safety.
Patent Information
- Application Number
- CN202423065915.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-11
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2034-12-11
AI Technical Summary
Batteries are prone to accumulating heat when they get too hot, which can lead to fire or explosion, making them less safe.
A battery structure is designed, including a casing, a cell, a pressure relief mechanism, and an insulating part. The insulating part consists of first and second insulating layers. The melting point of the first insulating layer is lower than that of the second insulating layer, so that it melts first in the event of thermal runaway of the cell, reducing gas blockage. The pressure relief mechanism is used to release gas and reduce the risk of explosion and fire.
By designing the insulation layer and coordinating with the pressure relief mechanism, the time to battery ignition is delayed, the occurrence of explosions and fires is reduced, and battery safety is improved.
Smart Images
Figure CN223757587U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of battery safety, in particular to a battery and an electric device. BACKGROUND
[0002] A battery is a power supply device which supplies power by forming an electric circuit with other devices.
[0003] The battery generally includes a cell, a shell and a pole, the shell can protect the cell, the cell stores electric energy and supplies power to other devices through the pole.
[0004] In the related art, when the temperature of the cell is overheated, heat will accumulate in the battery, causing the battery to catch fire or even explode, and thus the safety is poor. CONTENT OF THE INVENTION
[0005] In view of this, the present application provides a battery and an electric device to improve the safety thereof.
[0006] Specifically, the technical scheme includes the following:
[0007] The first aspect of the present application provides a battery, the battery includes a shell, a cell, a pressure relief mechanism and an insulation part, wherein,
[0008] The shell has a receiving cavity, the cell is located in the receiving cavity, and the pressure relief mechanism is in communication with the receiving cavity.
[0009] The insulation part is located between the cell and the pressure relief mechanism.
[0010] The insulation part includes a first insulation layer and a second insulation layer, the first insulation layer and the second insulation layer are arranged in a stack, and the first insulation layer is closer to the cell than the second insulation layer.
[0011] The melting point of the first insulation layer is lower than the melting point of the second insulation layer.
[0012] Optionally, the ratio of the thickness of the first insulation layer to the thickness of the second insulation layer is 0.5 to 1.
[0013] Optionally, the thickness of the first insulation layer is 0.01 to 0.05 mm, and the thickness of the second insulation layer is 0.02 to 0.1 mm.
[0014] Optionally, the melting point of the first insulation layer is 80 to 130℃, and the melting point of the second insulation layer is 130 to 170℃.
[0015] Optionally, the insulating part further comprises a base layer, the base layer is located between the first insulating layer and the second insulating layer, and is connected to the first insulating layer and the second insulating layer respectively.
[0016] Optionally, the shell comprises a pressure relief hole, the pressure relief hole is in communication with the accommodating cavity, the shell has a pressure relief area and a protection area, the pressure relief mechanism is located in the pressure relief hole, the pressure relief hole is located in the pressure relief area, and the thickness of the pressure relief area is less than the thickness of the protection area.
[0017] Optionally, the thickness of the pressure relief area is in the range of 0.01 to 0.03 mm, and the thickness of the protection area is in the range of 0.05 to 0.3 mm.
[0018] Optionally, the shell has an explosion-proof groove, the explosion-proof groove is in communication with the accommodating cavity, and the threshold of pressure borne by the explosion-proof groove is greater than the threshold of pressure borne by the pressure relief area.
[0019] Optionally, the ratio of the threshold of pressure borne by the pressure relief area to the threshold of pressure borne by the explosion-proof groove is in the range of 0.25 to 0.5.
[0020] Optionally, the ratio of the depth of the explosion-proof groove to the thickness of the side wall of the accommodating cavity is in the range of 0.1 to 0.5.
[0021] Optionally, the shell further has a liquid injection hole, and the liquid injection hole is in communication with the accommodating cavity.
[0022] Optionally, the ratio of the capacity of the battery cell to the number of liquid injection holes is in the range of 0.5 to 1.
[0023] The second aspect of the application provides a power utilization device, which comprises the battery as described in the above technical solution.
[0024] The technical solution provided by the embodiments of the application has at least the following beneficial effects: the battery cell is located in the accommodating cavity, which is conducive to the shell replacing the battery cell to contact other objects and protecting the battery cell. The pressure relief mechanism can release the gas generated when the battery cell is in thermal runaway, thereby delaying the time of the battery catching fire. The insulating part is located between the battery cell and the pressure relief mechanism, which supports the battery cell and also reduces the case of the battery cell directly contacting the shell to cause electric leakage. The melting point of the first insulating layer is lower than that of the second insulating layer, which is conducive to connecting the battery cell and the shell on the one hand, and can melt earlier than the second insulating layer when the battery cell is in thermal runaway, thereby reducing the shielding of the insulating part to the gas, which is conducive to the gas breaking through the shell to reduce the case of explosion and fire. BRIEF DESCRIPTION OF DRAWINGS
[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments description will be briefly introduced. Obviously, the drawings in the following description only represent some of the embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative effort based on these drawings.
[0026] Figure 1 A structural schematic diagram of a battery provided in the embodiments of the present application is shown in the figure.
[0027] Figure 2 A partial structural schematic diagram of a battery provided in the embodiments of the present application is shown in the figure.
[0028] Figure 3 A top view schematic diagram of a battery provided in the embodiments of the present application is shown in the figure.
[0029] The reference signs in the figures respectively represent:
[0030] 1, housing; 11, cover plate; 111, protection area; 112, pressure relief area; 12, side plate; 100, accommodating cavity; 101, explosion-proof groove; 102, liquid injection hole; 103, pressure relief hole;
[0031] 2, battery cell;
[0032] 3, pressure relief mechanism;
[0033] 4, insulation part; 41, first insulation layer; 42, second insulation layer; 43, base layer.
[0034] The above figures have shown the specific embodiments of the present application, which will be described in more detail hereinafter. These figures and textual descriptions are not intended to limit the scope of the concept of the present application by any means, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION
[0035] The technical solutions in the embodiments of the present application will be described clearly and completely in the following with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort belong to the scope of protection of the present application.
[0036] The positional nouns such as “upper”, “lower”, “lateral” and the like involved in the embodiments of the present application are generally taken with reference to the figures. Figure 1The relative relationship of the orientations shown in the figures is taken as a reference, and these orientation terms are used only for the purpose of more clearly describing the structure and the relationship between structures, and are not intended to describe absolute orientations. When the product is placed in different postures, the orientations may change, for example, "upper" and "lower" may be interchanged.
[0037] Unless otherwise defined, all technical terms used in the embodiments of the present application have the same meanings as commonly understood by one of ordinary skill in the art.
[0038] In order to make the technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the drawings.
[0039] The first aspect of the present application provides a battery, such as Figure 1 and Figure 2 As shown in the figures, the battery comprises a shell 1, an electric core 2, a pressure relief mechanism 3 and an insulation part 4, wherein,
[0040] The shell 1 has a containing cavity 100, the electric core 2 is located in the containing cavity 100, and the pressure relief mechanism 3 is in communication with the containing cavity 100.
[0041] The insulation part 4 is located between the electric core 2 and the pressure relief mechanism 3.
[0042] The insulation part 4 comprises a first insulation layer 41 and a second insulation layer 42, the first insulation layer 41 and the second insulation layer 42 are arranged in a stack, and the first insulation layer 41 is closer to the electric core 2 than the second insulation layer 42.
[0043] The melting point of the first insulation layer 41 is lower than the melting point of the second insulation layer 42.
[0044] It can be understood that the electric core 2 is located in the containing cavity 100, which is conducive to the shell 1 replacing the electric core 2 to contact other objects and protecting the electric core 2. The pressure relief mechanism 3 can release the gas generated when the electric core 2 is in thermal runaway, delaying the time of the battery catching fire. The insulation part 4 is located between the electric core 2 and the pressure relief mechanism 3, which forms a support for the electric core 2, and also can reduce the case that the electric core 2 directly contacts the shell 1 to cause electric leakage. The melting point of the first insulation layer 41 is lower than the melting point of the second insulation layer 42, which is conducive to the insulation part 4 connecting the electric core 2 and the shell 1 on the one hand, and on the other hand, the first insulation layer 41 can melt earlier than the second insulation layer 42 when the electric core 2 is in thermal runaway, so as to reduce the shielding effect of the insulation part 4 on the gas, thereby reducing the explosion and fire of the battery.
[0045] In the embodiments of the present application, after the first insulation layer 41 of the insulation part 4 melts, the overall structural strength decreases, at the same time, the contact area between the second insulation layer 42 and the gas increases, which can improve the melting speed, so as to reduce the shielding effect on the gas, and thus help the gas to leave the containing cavity 100 through the pressure relief mechanism 3, and reduce the case that the shell 1 explodes due to the accumulation of the gas.
[0046] In the embodiments of the present application, the material of the shell 1 can be stainless steel, aluminum alloy, etc. The shape of the shell 1 can be square or cylindrical.
[0047] In the embodiments of the present application, the material of the first insulating layer 41 can be at least one of epoxy resin, high molecular polytetrafluoroethylene resin, aluminum oxide ceramic, polyaryletherketone, polyether ether ketone, acrylic resin, polyurethane, polyvinyl alcohol, polybutyl acrylate, polyacrylonitrile, and polyvinyl pyrrolidone. In the embodiments of the present application, the material of the second insulating layer 42 can be at least one of epoxy resin, high molecular polytetrafluoroethylene resin, aluminum oxide ceramic, polyaryletherketone, polyether ether ketone, acrylic resin, polyurethane, polyvinyl alcohol, polybutyl acrylate, polyacrylonitrile, and polyvinyl pyrrolidone. When the first insulating layer 41 is selected from the above-mentioned materials, the second insulating layer 42 can be correspondingly selected from a material having a higher melting point than the material selected for the first insulating layer 41.
[0048] In the embodiments of the present application, the battery cell 2 can be in a winding structure, a laminated structure, or a special-shaped structure.
[0049] In the embodiments of the present application, the first insulating layer 41 can cover a portion of the outer surface of the battery cell 2 and be connected to the battery cell 2.
[0050] In the embodiments of the present application, the pressure relief mechanism 3 can be arranged at the top or side of the accommodating cavity 100.
[0051] In the embodiments of the present application, the shell 1 includes a top plate and a side plate 12, and the accommodating cavity 100 is formed by welding between the top plate and the side plate 12. The depth of the molten pool of the weld joint between the top plate and the side plate 12 is 150-400 um, the depth of the weld joint is 700-1000 um, and the depth-width ratio of the weld joint is 0.3-0.4. The depth of the molten pool of the weld joint between the shell 1 and the top plate is less than 1 / 3 of the thickness of the top plate.
[0052] In the embodiments of the present application, the battery has a pole, which protrudes from the accommodating cavity 100 and is used for electrically connecting the battery cell 2 and other devices to form a loop.
[0053] In some embodiments of the present application, the ratio of the thickness of the first insulating layer 41 to the thickness of the second insulating layer 42 is in the range of 0.5-1.
[0054] It can be understood that such an arrangement is conducive to rapid melting of the first insulating layer 41 when the battery cell 2 is in thermal runaway, thereby facilitating the gas to exit the accommodating cavity 100 through the pressure relief mechanism 3.
[0055] In the embodiments of the present application, the ratio of the thickness of the first insulating layer 41 to the thickness of the second insulating layer 42 can be 0.5, 0.6, 0.7, 0.8, 0.9 or 1, or other values within the range of 0.5 to 1.
[0056] In some embodiments of the present application, the thickness of the first insulating layer 41 can range from 0.01 to 0.05 mm, and the thickness of the second insulating layer 42 can range from 0.02 to 0.1 mm.
[0057] It can be understood that within the above ranges, the first insulating layer 41 is beneficial to melt when the battery cell 2 is in thermal runaway, and in cooperation with the second insulating layer 42 within the above ranges, the first insulating layer 41 and the second insulating layer 42 support the battery cell 2 when the battery cell 2 is in normal operation.
[0058] In the embodiments of the present application, the thickness of the first insulating layer 41 can be 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm or 0.05 mm, or other values within the range of 0.01 to 0.05 mm.
[0059] In the embodiments of the present application, the thickness of the second insulating layer 42 can be 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm or 0.1 mm, or other values within the range of 0.02 to 0.1 mm.
[0060] In some embodiments of the present application, the melting point of the first insulating layer 41 can range from 80 to 130℃, and the melting point of the second insulating layer 42 can range from 130 to 170℃.
[0061] It can be understood that within the above ranges, the first insulating layer 41 can be melted by the heat generated by the thermal runaway of the battery cell 2, which is beneficial to improve the efficiency of the gas passing through the pressure relief mechanism 3 and reduce the accumulation of heat in the accommodation cavity 100.
[0062] In the embodiments of the present application, the melting point of the first insulating layer 41 can be 80℃, 85℃, 90℃, 95℃, 100℃, 105℃, 110℃, 115℃, 120℃, 125℃ or 130℃, or other values within the range of 80 to 130℃.
[0063] In the embodiments of the present application, the melting point of the second insulating layer 42 can be 130℃, 135℃, 140℃, 145℃, 150℃, 155℃, 160℃, 165℃ or 170℃, or other values within the range of 130 to 170℃.
[0064] In some embodiments of the present application, as Figure 1As shown, the insulation part 4 further comprises a base layer 43, which is located between the first insulation layer 41 and the second insulation layer 42 and is connected to the first insulation layer 41 and the second insulation layer 42 respectively.
[0065] It can be understood that the base layer 43 is beneficial to improve the supporting effect of the insulation part 4, which is beneficial to improve the stability of the battery cell 2 in the accommodating cavity 100.
[0066] In the embodiments of the present application, the thickness of the base layer 43 can be 1 to 3 times the thickness of the first insulation layer 41.
[0067] In some embodiments of the present application, as shown, Figure 3 As shown, the shell comprises a pressure relief hole 103, which is in communication with the accommodating cavity 100, the shell 1 has a pressure relief area 111 and a protection area 112, and the pressure relief mechanism 3 is located in the pressure relief hole 103. The pressure relief hole 103 is located in the pressure relief area 111, and the thickness of the pressure relief area 111 is less than the thickness of the protection area 112.
[0068] It can be understood that the pressure relief hole 103 can be used for gas to pass through, so as to reduce the accumulation of gas in the accommodating cavity 100 to cause explosion. At the same time, the thickness of the pressure relief area 111 is small, and when the thermal runaway of the battery cell 2 is more serious, the pressure relief area 111 can be broken in advance, so as to slow down the accumulation of gas in the accommodating cavity 100.
[0069] In the embodiments of the present application, the pressure relief area 111 can be circular, and the protection area 112 surrounds the pressure relief area 111 and is integrally formed with the pressure relief area 111. The area of the pressure relief area 111 can be a circle with a radius of 5 to 10 mm.
[0070] In the embodiments of the present application, the pressure relief mechanism 3 can comprise a pressure relief valve, which is installed on the pressure relief hole 103 and functions as a one-way gas guide, which is used to avoid the accumulation of gas in the accommodating cavity 100.
[0071] In the embodiments of the present application, the ratio of the thickness of the protection area 112 to the thickness of the pressure relief area 111 can be 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9 or 5, or other values between 1.5 and 5.
[0072] In the embodiments of the present application, the cross-sectional shape of the pressure relief hole 103 can be square, prismatic or circular. The maximum width of the cross-section of the pressure relief hole 103 can be in the range of 3 to 5 mm, and the minimum width can be in the range of 1 to 3 mm.
[0073] In some embodiments of the present application, the thickness of the pressure relief area 111 is in the range of 0.01 to 0.03 mm, and the thickness of the protection area 112 is in the range of 0.05 to 0.3 mm.
[0074] It can be understood that within the above ranges, the pressure relief area 111 is easily broken by gas when the battery cell 2 is in thermal runaway, and the protection area 112 can protect the battery cell 2 when the battery cell 2 is working normally.
[0075] In the embodiments of the present application, the thickness of the pressure relief area 111 can be 0.01 mm, 0.02 mm or 0.03 mm, or other values in the range of 0.01 to 0.03 mm.
[0076] In the embodiments of the present application, the thickness of the protection area 112 can be 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.2 mm, 0.21 mm, 0.22 mm, 0.23 mm, 0.24 mm, 0.25 mm, 0.26 mm, 0.27 mm, 0.28 mm, 0.29 mm or 3 mm, or other values in the range of 0.05 to 0.3 mm.
[0077] In some embodiments of the present application, as shown in Figure 1 The housing 1 has an explosion-proof groove 101 that communicates with the accommodating cavity 100, and the threshold of the pressure that the explosion-proof groove 101 can withstand is greater than the threshold of the pressure that the pressure relief area 111 can withstand.
[0078] It can be understood that the explosion-proof groove 101 can be broken when the gas in the accommodating cavity 100 accumulates to a certain extent, which is conducive to the overflow of the gas from the accommodating cavity 100 to the outside, thereby avoiding the explosion of the battery. The threshold of the pressure that the explosion-proof groove 101 can withstand is greater than the threshold of the pressure that the pressure relief area 111 can withstand, which is conducive to the pre-venting of the pressure relief area 111 to relieve the accumulated gas, and then achieving pressure relief through the explosion-proof groove 101 when the accommodating cavity 100 cannot withstand the pressure of the gas.
[0079] In the embodiments of the present application, the threshold of the pressure that the explosion-proof groove 101 can withstand is greater than 1 MPa, and the depth of the explosion-proof groove 101 is 10% to 50% of the thickness of the side wall of the accommodating groove. The width of the explosion-proof groove 101 is in the range of 0.5 to 3 mm.
[0080] In the embodiment of the present application, the cross-sectional shape of the explosion-proof groove 101 can be circular, semicircular, square, prismatic or elliptical.
[0081] In the embodiment of the present application, the number of explosion-proof grooves 101 can be 2, 3, 4 or 5, and the explosion-proof grooves 101 can be arranged on the same side of the accommodation cavity 100 or on different sides.
[0082] In the embodiment of the present application, the ratio of the capacity Ah of the battery cell 2 to the threshold value of the pressure MPa that the explosion-proof groove 101 can withstand can be 2, 3, 4, 5, 6, 7 or 8, or other values in the range of 2 to 8.
[0083] In some embodiments of the present application, the ratio of the threshold value of the pressure that the pressure relief area 111 can withstand to the threshold value of the pressure that the explosion-proof groove 101 can withstand is in the range of 0.25 to 0.5.
[0084] It can be understood that within the above range, the pressure relief area 111 tends to break before the explosion-proof groove 101 in the case of thermal runaway of the battery cell 2, which is conducive to improving its gas discharge capacity according to the thermal runaway situation.
[0085] In the embodiment of the present application, the ratio of the threshold value of the pressure that the pressure relief area 111 can withstand to the threshold value of the pressure that the explosion-proof groove 101 can withstand can be 0.25, 0.26, 0.27, 0.28, 0.29, 0.2, 0.31, 0.32, 0.33, 0.34, 0.35, 0.36, 0.37, 0.38, 0.39, 0.4, 0.41, 0.42, 0.43, 0.44, 0.45, 0.46, 0.47, 0.48, 0.49 or 5, or other values in the range of 0.25 to 5.
[0086] In some embodiments of the present application, the ratio of the depth of the explosion-proof groove 101 to the thickness of the side wall of the accommodation cavity 100 is in the range of 0.1 to 0.5.
[0087] It can be understood that such a setting is conducive to the explosion-proof groove 101 communicating the accommodation cavity 100 with the outside when it is damaged, which is conducive to discharging the accumulated gas in the accommodation cavity 100.
[0088] In the embodiment of the present application, the ratio of the depth of the explosion-proof groove 101 to the thickness of the side wall of the accommodation cavity 100 can be 0.1, 0.2, 0.3, 0.4 or 0.5, or other values in the range of 0.1 to 0.5.
[0089] In the embodiments of the present application, the explosion-proof groove 101 can be formed by laser etching. The remaining thickness of the opening groove after etching is 40-120 um, and the opening width of the explosion-proof groove 101 is 0.5-2 mm.
[0090] In some embodiments of the present application, as shown in Figure 1 The shell 1 also has a liquid injection hole 102 which communicates with the accommodation cavity 100.
[0091] It can be understood that the liquid injection hole 102 can be used for the electrolyte to enter the accommodation cavity 100, which is beneficial to the ion migration of the battery cell 2 during charging and discharging.
[0092] In the embodiments of the present application, a sealing ring 33 can be arranged between the top cap 31 and the side wall of the liquid injection hole 102 to improve the sealing effect of the liquid injection hole 102.
[0093] In the embodiments of the present application, the cross-sectional shape of the liquid injection hole 102 can be circular, prismatic, equigeometric, or a combination of two or more geometric shapes, or other shapes.
[0094] In the embodiments of the present application, the top column 32 can be conical.
[0095] In the embodiments of the present application, the top cap 31 can be connected to the side wall of the liquid injection hole 102 by welding or other methods.
[0096] In the embodiments of the present application, the top cap 31 can be one of polyurethane elastomer, propylene-based elastomer, vinyl-based elastomer, and butylene-based elastomer.
[0097] In the embodiments of the present application, the battery further comprises a top cap 31 and a top column 32, the top column 32 is located in the liquid injection hole 102, the top cap 31 is connected to the side wall of the liquid injection hole 102 and the top column 32, and the top cap 31 and the top column 32 are beneficial to form a one-way valve at the liquid injection hole 102, thereby preventing the electrolyte from leaking from the liquid injection hole 102.
[0098] In some embodiments of the present application, the ratio of the capacity of the battery cell 2 to the number of liquid injection holes 102 is 0.5-1.
[0099] It can be understood that the capacity of the battery cell 2 is related to the volume of the electrolyte, and the greater the capacity of the battery cell 2, the greater the demand for electrolyte. Correspondingly, increasing the number of liquid injection holes 102 is beneficial to improve the injection efficiency and improve the soaking effect of the battery cell 2. At the same time, multiple liquid injection holes 102 for electrolyte injection can also reduce the situation of liquid spouting and liquid overflow of a single liquid injection hole 102, which is beneficial to reduce the pollution caused by the overflow of electrolyte.
[0100] In the embodiments of the present application, the number of the liquid injection holes 102 can be 1, 2, 3, 4 or 5, and the liquid injection holes 102 can be arranged on the same side of the shell 1 or on different sides of the shell 1.
[0101] The second aspect of the present application provides a power-using device, which comprises the battery of the above-mentioned embodiments.
[0102] It can be understood that, due to the battery of the above-mentioned embodiments, the power-using device of the present application has the same technical effects as the above-mentioned embodiments, which will not be repeated here.
[0103] In the embodiments of the present application, the power-using device can be a mobile phone, a tablet computer or the like.
[0104] In the present application, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance. The term "a plurality of" refers to two or more, unless otherwise explicitly limited.
[0105] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. The present application is intended to cover any variations, uses or adaptive changes of the present application following the general principles of the present application and including common knowledge or conventional technical means in the art not disclosed in the present application. The specification and examples are only considered as exemplary.
[0106] It should be understood that the present application is not limited to the precise construction that has been described above and shown in the accompanying drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the present application is only limited by the appended claims.
Claims
1. A battery, characterized by, The battery comprises a shell (1), an electric core (2), a pressure relief mechanism (3) and an insulation part (4), wherein, The shell (1) has a containing cavity (100), the electric core (2) is located in the containing cavity (100), and the pressure relief mechanism (3) communicates with the containing cavity (100); The insulation part (4) is located between the electric core (2) and the pressure relief mechanism (3); The insulation part (4) comprises a first insulation layer (41) and a second insulation layer (42), the first insulation layer (41) and the second insulation layer (42) are arranged in a stack, and the first insulation layer (41) is closer to the electric core (2) than the second insulation layer (42); The melting point of the first insulation layer (41) is lower than that of the second insulation layer (42).
2. The battery of claim 1, wherein, The ratio of the thickness of the first insulation layer (41) to the thickness of the second insulation layer (42) ranges from 0.5 to 1.
3. The battery of claim 2, wherein, The thickness of the first insulation layer (41) ranges from 0.01 to 0.05 mm, and the thickness of the second insulation layer (42) ranges from 0.02 to 0.1 mm.
4. The battery of claim 1, wherein, The melting point of the first insulation layer (41) ranges from 80 to 130 ℃, and the melting point of the second insulation layer (42) ranges from 130 to 170 ℃.
5. The battery of claim 1, wherein, The insulation part (4) further comprises a base layer (43), the base layer (43) is located between the first insulation layer (41) and the second insulation layer (42), and is connected to the first insulation layer (41) and the second insulation layer (42) respectively.
6. The battery of claim 1, wherein, The shell (1) comprises a pressure relief hole (103) communicating with the containing cavity (100), the shell (1) has a pressure relief area (111) and a protection area (112), the pressure relief mechanism (3) is located in the pressure relief hole (103), the pressure relief hole (103) is located in the pressure relief area (111), and the thickness of the pressure relief area (111) is less than that of the protection area (112).
7. The battery of claim 6, wherein, The thickness of the pressure relief area (111) ranges from 0.01 to 0.03 mm, and the thickness of the protection area (112) ranges from 0.05 to 0.3 mm.
8. The battery of claim 6, wherein, The shell (1) has an anti-explosion groove (101) communicating with the containing cavity (100), and the threshold of pressure borne by the anti-explosion groove (101) is greater than that of the pressure relief area (111).
9. The battery of claim 8, wherein, The ratio of the threshold of pressure borne by the pressure relief area (111) to that of the anti-explosion groove (101) ranges from 0.25 to 0.
5.
10. The battery of claim 8, wherein, The ratio of the depth of the anti-explosion groove (101) to the thickness of the side wall of the containing cavity (100) ranges from 0.1 to 0.
5.
11. The battery of claim 1, wherein, The shell (1) further has a liquid injection hole (102) communicating with the containing cavity (100).
12. The battery of claim 11, wherein, The ratio of the capacity of the electric core (2) to the number of the liquid injection holes (102) ranges from 0.5 to 1.
13. An electrical device, characterized by The electric device comprises the battery as claimed in any one of claims 1 to 12.