Bottom supporting plate, battery monomer, battery and electric equipment

Abstract

The utility model relates to the technical field of batteries, in particular to a bottom supporting plate, a battery monomer, a battery and electric equipment.The bottom supporting plate comprises a body part, the body part comprises a first exhaust area and a second exhaust area, a plurality of first exhaust grooves are formed in the first exhaust area, and a plurality of second exhaust grooves are formed in the second exhaust area; the first exhaust groove and the second exhaust groove both penetrate through the body part; the supporting part is convexly arranged on the body part and is used for abutting against the shell; the exhaust part is arranged on the body part in a protruding mode and surrounds the first exhaust area, and a vent groove is formed in the exhaust part. According to the bottom supporting plate, the relative position of the electrode assembly and the shell can be limited between the electrode assembly and the anti-explosion valve, so that the situation that the electrode assembly and the anti-explosion valve move, consequently, the anti-explosion valve is blocked, and consequently air exhausting is not smooth can be avoided, and the electrode assembly can be prevented from being damaged by collision when the electrode assembly and the anti-explosion valve move.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a bottom support plate, a battery cell, a battery and an electrical device. Background Art

[0002] Conventional battery cell explosion-proof valves and tabs are on the same side, and the thermal runaway pressure relief area is in the same area as the high and low voltage lines. Once the battery cell thermally runs away, the eruption material is likely to accumulate in the pressure relief channel, causing a high-voltage short circuit. At present, existing technologies set the explosion-proof valve and tabs on opposite sides, that is, the explosion-proof valve is set at the bottom of the shell, but the space reserved between the core and the shell is generally small. As the core shakes, the distance between the core and the bottom of the shell becomes smaller, and there may be problems with poor gas discharge, which brings great safety hazards.

[0003] At the same time, since an explosion-proof valve is installed at the bottom of the shell, the explosion-proof valve will corrode when immersed in the electrolyte for a long time, which brings safety risks. Currently, a protective film is affixed to the explosion-proof valve, but as the electrolyte erodes, the protective film will fall off, and the explosion-proof valve will not be protected. Utility Model Content

[0004] The purpose of the present application is to provide a bottom support plate, a battery cell, a battery and an electrical device, so as to solve the technical problem that the conventional explosion-proof valve of the battery cell in the prior art is prone to poor gas discharge to a certain extent.

[0005] The present application provides a bottom support plate, which is placed in a battery cell. The battery cell includes a shell and an electrode assembly arranged in the shell. The shell is provided with an explosion-proof valve. The bottom support plate includes:

[0006] A main body having a first surface and a second surface opposite to each other in a thickness direction, the main body including a first exhaust region and a second exhaust region, the first exhaust region being provided with a plurality of first exhaust grooves, the second exhaust region being provided with a plurality of second exhaust grooves, the first exhaust grooves and the second exhaust grooves both passing through the first surface and the second surface;

[0007] a supporting portion protruding from the second surface for contacting with the housing; and

[0008] The exhaust portion is convexly arranged on the second surface and surrounds the first exhaust area to form an exhaust space. The exhaust portion is provided with a ventilation groove to guide the gas in the second exhaust area into the first exhaust area.

[0009] In the above technical solution, further, the main body has a first end and a second end opposite to each other along a first direction, and the support portion is respectively arranged on the first end and the second end.

[0010] In any of the above technical solutions, further, the exhaust portion includes a bottom surface and two side surfaces connected to the bottom surface, the side surfaces include a first side surface and a second side surface, and the ventilation groove runs through the first side surface and the second side surface.

[0011] In any of the above technical solutions, further, an annular groove is formed on the bottom surface of the exhaust portion for embedding a sealing member.

[0012] In any of the above technical solutions, further, the exhaust portion also includes a sealing member arranged on the bottom surface, so as to make the bottom surface seal against the shell.

[0013] The present application also provides a battery cell, comprising a shell, a cover plate, an electrode assembly, a protective film and a bottom support plate in any of the above technical solutions; the shell has a receiving cavity with an opening at one end, the electrode assembly is arranged in the receiving cavity, the cover plate closes the opening, a pressure relief hole is opened on the bottom surface of the shell, the explosion-proof valve closes the pressure relief hole, the protective film is arranged on the surface of the explosion-proof valve located inside the shell, the sealing member presses the protective film to enhance the sealing of the explosion-proof valve, and the bottom support plate is located between the shell and the electrode assembly. The battery cell has all the beneficial technical effects of the above bottom support plate.

[0014] In the above technical solution, further, the electrode assembly includes an electrode assembly body and an insulating film covering the outside of the electrode assembly body, and a plurality of air holes are provided on the surface of the insulating film in contact with the bottom support plate.

[0015] In any of the above technical solutions, further, the outer contour of the bottom surface of the exhaust portion surrounds the pressure relief hole and is spaced apart from the pressure relief hole.

[0016] The present application also provides a battery, including the battery cell in any of the above technical solutions, and thus has all the beneficial technical effects of the battery cell, which will not be repeated here.

[0017] The present application also provides an electrical device, including a battery in any of the above technical solutions, and thus has all the beneficial technical effects of the battery, which will not be described in detail here.

[0018] Compared with the prior art, the beneficial effects of this application are:

[0019] The bottom support plate provided in the present application includes: a main body portion, having a first surface and a second surface opposite to each other in the thickness direction, the main body portion including a first exhaust area and a second exhaust area, the first exhaust area is provided with a plurality of first exhaust grooves, the second exhaust area is provided with a plurality of second exhaust grooves, and the first exhaust grooves and the second exhaust grooves both penetrate the first surface and the second surface; a support portion, convexly arranged on the second surface for abutting against the shell; and an exhaust portion, convexly arranged on the second surface and surrounding the first exhaust area to form an exhaust space, and a ventilation groove is provided on the exhaust portion for introducing the gas in the second exhaust area into the first exhaust area.

[0020] The bottom support plate provided in the present application can limit the relative position of the electrode assembly and the shell between the electrode assembly and the explosion-proof valve, thereby preventing the electrode assembly and the explosion-proof valve from moving and causing the explosion-proof valve to be blocked and cause poor exhaust, and can also prevent the electrode assembly from being damaged when the two move.

[0021] The battery cell provided in the present application includes the bottom support plate mentioned above, so that the explosion-proof valve and the electrode assembly are separated by the bottom support plate, and the sealing and protective effect of the protective film on the explosion-proof valve can be enhanced by setting the bottom support plate, thereby reducing the risk of damage and corrosion of the explosion-proof valve, ensuring that the explosion-proof valve can smoothly release pressure when thermal runaway occurs in the battery cell, thereby improving the safety of the battery.

[0022] The battery provided in the present application, including the battery monomer described above, significantly improves the safety of the battery.

[0023] The electrical equipment provided in the present application, including the battery described above, has all the beneficial technical effects of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0025] Figure 1 A schematic diagram of the structure of the bottom support plate provided in the embodiment of the present application;

[0026] Figure 2 for Figure 1 A is a schematic diagram of the enlarged structure;

[0027] Figure 3 Another structural schematic diagram of the bottom support plate provided in the embodiment of the present application;

[0028] Figure 4Another perspective view of the bottom support plate provided in the embodiment of the present application;

[0029] Figure 5 A schematic diagram of the structure of a battery cell provided in an embodiment of the present application;

[0030] Figure 6 Another structural schematic diagram of a battery cell provided in an embodiment of the present application;

[0031] Figure 7 A cross-sectional view of a battery cell provided in an embodiment of the present application;

[0032] Figure 8 for Figure 7 Schematic diagram of the enlarged structure in B.

[0033] Reference numerals:

[0034] 1-main body, 101-first exhaust groove, 102-second exhaust groove, 103-first surface, 104-second surface, 105-first end, 106-second end, 107-through hole, 2-support portion, 3-exhaust portion, 301-first side, 302-second side, 303-venting groove, 4-sealing member, 5-shell, 501-pressure relief hole, 502-accommodating chamber, 6-cover plate, 7-electrode assembly body, 8-insulating film, 801-air vent, 9-explosion-proof valve, a-first direction. DETAILED DESCRIPTION

[0035] The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0036] The components of the embodiments of the present application generally described and shown in the drawings herein can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed, but merely represents the selected embodiments of the present application.

[0037] Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of this application.

[0038] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0039] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0040] Refer to the following Figures 1 to 8 The bottom support plate, battery cell, battery and electrical equipment according to the embodiments of the present application are described.

[0041] See also Figures 1 to 8 As shown, an embodiment of the present application provides a bottom support plate for being placed in a battery cell, wherein the battery cell includes a shell 5 and an electrode assembly disposed in the shell 5, and an explosion-proof valve 9 is disposed on the shell 5. The bottom support plate includes a main body 1, a support portion 2, and an exhaust portion 3, wherein the main body 1 is in the shape of a rectangular plate, the main body 1 has a first surface 103 and a second surface 104 distributed along its thickness direction, and the main body 1 includes a first exhaust area and a second exhaust area, the first exhaust area and the second exhaust area are separated by the exhaust portion 3, the exhaust portion 3 is provided with a ventilation groove 303, the first exhaust area and the second exhaust area are connected at the ventilation groove 303, preferably, the first exhaust area is disposed in the middle position of the main body 1, and the second exhaust area is disposed around the first exhaust area.

[0042] The first exhaust region is provided with a plurality of first exhaust grooves 101, each of which passes through the first surface 103 and the second surface 104 of the main body 1; the second exhaust region is provided with a plurality of second exhaust grooves 102, each of which passes through the first surface 103 and the second surface 104 of the main body 1, so that the high-temperature airflow released after the explosion-proof valve 9 is opened can pass through the first exhaust grooves 101 and the second exhaust grooves 102.

[0043] Preferably, the material of the main body 1 can be one or more materials such as polyethylene terephthalate, polypropylene, polyethylene, polystyrene, polyvinylidene fluoride, polyvinyl chloride, polycarbonate, etc.

[0044] The support portion 2 is arranged on the second surface 104 of the main body 1, and the support portion 2 is protruded relative to the main body 1, so that after the base support plate is installed in the shell 5 of the battery cell, the support portion 2 can abut against the shell 5, so that the second surface 104 of the main body 1 does not contact the shell 5, and a gap is formed between the main body 1 and the shell 5, separating the explosion-proof valve 9 from the electrode assembly in the shell 5, and can limit the relative position between the explosion-proof valve 9 and the electrode assembly to avoid the movement of the two after the explosion-proof valve 9 is opened, resulting in a reduction in the distance between the explosion-proof valve 9 and the electrode assembly, resulting in the electrode assembly blocking the explosion-proof valve 9 and affecting the normal exhaust of the explosion-proof valve 9, or the explosion-proof valve 9 hitting the electrode assembly and causing more serious safety problems.

[0045] Preferably, there are multiple support parts 2, and the shape of the support parts 2 can be, but is not limited to, a cylinder. The two ends of the body part 1 along the first direction a are respectively a first end 105 and a second end 106, wherein the first direction a is specifically the length direction of the body part 1, at least one support part 2 is disposed near the first end 105 on the second surface 104 of the body part 1, and at least one support part 2 is disposed near the second end 106 on the second surface 104 of the body part 1, thereby improving the stability of the bottom support plate in the shell 5. Figure 1 As shown, the first end 105 of the main body 1 is provided with two support parts 2 at intervals along its width direction. Preferably, a through hole 107 is provided on the plate surface between the two support parts 2 of the first end 105; the second end 106 of the main body 1 is provided with two support parts 2 at intervals along its width direction, and another through hole 107 is provided on the plate surface between the two support parts 2 of the second end 106. The through hole 107 penetrates the first surface 103 and the second surface 104 of the main body 1. The high-temperature gas generated after thermal runaway of the electrode assembly can flow to the second exhaust area through the through hole 107 around each support part 2, thereby improving the airflow fluidity between the first end 105 and the second end 106 of the main body 1 and avoiding the accumulation of heat and pressure at the first end 105 and / or the second end 106.

[0046] It should be noted that in the embodiment of the present application, the width of the main body 1 is not less than the thickness of the electrode assembly, and the width of the main body 1 is not greater than the thickness of the inner diameter of the shell 5 of the battery cell. On the one hand, it ensures the limiting effect of the bottom support plate between the electrode assembly and the shell 5, and on the other hand, it ensures that the bottom support plate can be smoothly installed in the shell 5.

[0047] Preferably, the thickness of the main body 1 is 1-2000 um.

[0048] Furthermore, among the multiple first exhaust grooves 101 and the multiple second exhaust grooves 102, at least multiple second exhaust grooves 102 are arranged in a herringbone shape, and each second exhaust groove 102 is arc-shaped. When the width of the main body 1 is fixed, the length of the second exhaust groove 102 is increased, thereby improving the exhaust effect.

[0049] Further, the exhaust portion 3 is arranged on the second surface 104 of the main body 1, and the exhaust portion 3 protrudes relative to the second surface 104 of the main body 1. Preferably, the exhaust portion 3 is annular, and more preferably, the shape of the exhaust portion 3 is adapted to the shape of the explosion-proof valve 9 and is runway-shaped, and the explosion-proof valve 9 is arranged opposite to the exhaust portion 3. The exhaust portion 3 is arranged around the first exhaust area, and the exhaust space is defined by the exhaust portion 3 and the first exhaust area, and the exhaust space is connected to each first exhaust groove 101. Preferably, the area of ​​the exhaust space is larger than the area of ​​the explosion-proof valve 9 to avoid the exhaust portion 3 blocking the explosion-proof valve 9. When the electrode assembly in the battery cell has thermal runaway, the high-temperature airflow released can flow into the exhaust air through the multiple first exhaust grooves 101 in the first exhaust area and break the explosion-proof valve 9 and finally be released to the outside of the battery cell through the explosion-proof valve 9.

[0050] Furthermore, the exhaust portion 3 specifically includes a bottom surface and a side surface connected to the bottom surface, and the side surface is divided into a first side surface 301 and a second side surface 302, wherein the first side surface 301 is the inner surface of the exhaust portion 3, and the second side surface 302 is the outer surface of the exhaust portion 3. A ventilation groove 303 is provided on the side surface of the exhaust portion 3, and the ventilation groove 303 runs through the first side surface 301 and the second side surface 302. The first exhaust area is connected to the second exhaust area through the ventilation groove 303. A part of the high-temperature airflow released after thermal runaway of the battery cell flows to the bottom of the main body 1 through the first exhaust area, and the other part flows to the bottom of the main body 1 through the second exhaust area. The high-temperature airflow flowing into the second exhaust area flows to the first exhaust area through the ventilation groove 303 and is finally released to the outside of the shell 5 through the explosion-proof valve 9, thereby avoiding the accumulation of high-temperature airflow in the first exhaust area and / or the second exhaust area.

[0051] Preferably, there are a plurality of ventilation grooves 303 , which are arranged at intervals. More preferably, each ventilation groove 303 is in a strip shape and extends along the length direction of the wall surface of the exhaust portion 3 .

[0052] Preferably, the thickness of the exhaust portion 3 is 1-2000um; the thickness of the exhaust portion 3 is equal to the distance between the second surface 104 of the main body 1 and the bottom surface of the shell 5, so that the exhaust portion 3 can also play a supporting role between the bottom support plate and the shell 5, further enhancing the stability of the bottom support plate between the electrode assembly and the shell 5.

[0053] Preferably, the width of the exhaust portion 3 is not less than the width of the explosion-proof valve 9 , and the length of the exhaust portion 3 is not less than the length of the explosion-proof valve 9 .

[0054] Furthermore, the bottom support plate also includes a seal 4, which can be but is not limited to a sealing ring. The seal 4 is arranged on the bottom surface of the exhaust part 3, so that after the bottom support plate is installed to the shell 5 of the battery cell, the seal 4 arranged at the bottom of the exhaust part 3 can play a sealing role between the exhaust part 3 and the shell 5, and play a role of isolation and protection for the explosion-proof valve 9, thereby reducing the risk of the electrolyte in the battery cell corroding the explosion-proof valve 9, causing the explosion-proof valve 9 to be damaged and unable to work normally.

[0055] Furthermore, an annular groove is provided on the bottom surface of the exhaust portion 3, the shape of the annular groove is adapted to the shape of the seal 4, and the seal 4 is embedded in the annular groove, thereby ensuring the stability between the seal 4 and the exhaust portion 3 and reducing the risk of the seal 4 falling off.

[0056] To sum up, the bottom support plate provided in the present application can limit the relative position between the electrode assembly and the explosion-proof valve 9, thereby preventing the electrode assembly from approaching the explosion-proof valve 9 and reducing the distance between the two, causing the explosion-proof valve 9 to be blocked, and affecting the smooth exhaust of the explosion-proof valve 9 when thermal runaway occurs in the electrode assembly, thereby causing more serious consequences.

[0057] See also Figures 5 to 8 As shown, an embodiment of the present application further provides a battery cell, including the bottom support plate described in the above embodiment, and thus has all the beneficial technical effects of the bottom support plate, which will not be described in detail herein.

[0058] The battery cell also includes a shell 5, a cover plate 6, an electrode assembly and an explosion-proof valve 9, wherein a receiving chamber 502 is formed inside the shell 5, an opening is provided at one end of the receiving chamber 502, the cover plate 6 is provided at the opening, and the electrode assembly is provided in the receiving chamber 502. After the electrode assembly is assembled into the receiving chamber 502, the cover plate 6 is sealed to the opening of the receiving chamber 502, thereby encapsulating the electrode assembly into the shell 5.

[0059] Furthermore, the shell 5 has a bottom surface, the bottom surface of the shell 5 is arranged opposite to the opening, the bottom support plate is arranged inside the shell 5 between the bottom surface of the shell 5 and the electrode assembly, and the support portion 2 of the bottom support plate abuts against the bottom surface of the shell 5 .

[0060] A pressure relief hole 501 is provided on the bottom surface of the shell 5, and the explosion-proof valve 9 is installed to the pressure relief hole 501. When the battery cell is in a normal state, the explosion-proof valve 9 closes the pressure relief hole 501. When the electrode assembly has thermal runaway, the high-temperature airflow generated can break open the explosion-proof valve 9 to open the pressure relief hole 501, thereby releasing temperature and pressure in the internal space of the shell 5.

[0061] Furthermore, a protective film is provided on the explosion-proof valve 9 of the battery cell, and the protective film covers the explosion-proof setting. Under normal circumstances, the protective film plays a protective role for the explosion-proof valve 9 to prevent the explosion-proof valve 9 from being directly immersed in the electrolyte of the electrode assembly. In the present application, the seal 4 is pressed on the protective film on the explosion-proof valve 9, so that the protective film of the explosion-proof valve 9 is not easy to fall off, thereby effectively reducing the risk of the explosion-proof valve 9 being damaged due to corrosion of the electrolyte and failing to open normally when the electrode assembly has thermal runaway. In this embodiment, the length of the protective film on the explosion-proof valve 9 is greater than the length of the exhaust portion 3, and the width of the protective film is greater than the width of the exhaust portion 3, so as to ensure that the seal 4 can fully press the protective film of the explosion-proof valve 9.

[0062] Preferably, in this embodiment, the thickness of the support portion 2 on the end of the main body portion 1 is slightly smaller than the thickness of the exhaust portion 3, so that after the bottom support plate is assembled to the shell 5, when the electrode assembly is pressed onto the bottom support plate, the exhaust portion 3 contacts the shell 5 before the support portion 2, so that the seal 4 on the bottom surface of the exhaust portion 3 can be tightly pressed to the protective film on the explosion-proof valve 9, thereby enhancing the compaction effect of the seal 4 on the protective film, thereby enhancing the sealing effect on the protective film and preventing the explosion-proof valve 9 from being corroded.

[0063] It should be noted that the outer contour of the bottom surface of the exhaust part 3 is arranged around the pressure relief hole 501, and the bottom surface of the exhaust part 3 is spaced apart from the pressure relief hole 501 to prevent the exhaust part 3 from blocking the pressure relief hole 501 and affecting the smoothness of the exhaust of the explosion-proof valve 9 and the pressure relief hole 501.

[0064] Furthermore, the electrode assembly includes an electrode assembly body 7 and an insulating film 8, the insulating film 8 covers the electrode assembly body 7, and a plurality of air holes 801 are provided on the surface of the insulating film 8 facing and in contact with the bottom support plate. By providing the air holes 801, heat accumulation can be avoided when thermal runaway occurs in the electrode assembly body 7, which may lead to more serious consequences.

[0065] To sum up, the battery cell provided in the present application separates the explosion-proof valve 9 and the electrode assembly through the bottom support plate, and the sealing and protective effect of the protective film on the explosion-proof valve 9 can be enhanced by setting the bottom support plate, thereby reducing the risk of damage and corrosion of the explosion-proof valve 9, ensuring that the explosion-proof valve 9 can smoothly release pressure when thermal runaway occurs in the battery cell, thereby improving the safety of the battery.

[0066] The embodiments of the present application also provide a battery, including the battery cell described in the above embodiments, and thus, has all the beneficial technical effects of the battery cell, which will not be described in detail herein.

[0067] The embodiments of the present application also provide an electrical device, including the battery described in the above embodiments, and thus has all the beneficial technical effects of the battery, which will not be described in detail here.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A bottom support plate placed in a battery cell, wherein the battery cell comprises a shell and an electrode assembly arranged in the shell, and an explosion-proof valve is arranged on the shell, characterized in that: The bottom support plate comprises: A main body having a first surface and a second surface opposite to each other in a thickness direction, the main body including a first exhaust region and a second exhaust region, the first exhaust region being provided with a plurality of first exhaust grooves, the second exhaust region being provided with a plurality of second exhaust grooves, the first exhaust grooves and the second exhaust grooves both passing through the first surface and the second surface; a supporting portion protruding from the second surface for contacting with the housing; and The exhaust portion is convexly arranged on the second surface and surrounds the first exhaust area to form an exhaust space. The exhaust portion is provided with a ventilation groove to guide the gas in the second exhaust area into the first exhaust area.

2. The bottom support plate according to claim 1, characterized in that: The main body has a first end and a second end opposite to each other along a first direction, and the support portion is respectively disposed on the first end and the second end.

3. The bottom support plate according to claim 1, characterized in that: The exhaust portion includes a bottom surface and two side surfaces connected to the bottom surface, the side surfaces include a first side surface and a second side surface, and the ventilation groove runs through the first side surface and the second side surface.

4. The bottom support plate according to claim 3, characterized in that: An annular groove is formed on the bottom surface of the exhaust portion for embedding a sealing member.

5. The bottom support plate according to claim 3, characterized in that: The exhaust portion further includes a sealing member disposed on the bottom surface, so as to enable the bottom surface to seal against the housing.

6. A battery cell, characterized in that: It includes a shell, a cover plate, an electrode assembly, a protective film and a bottom support plate according to claim 5; the shell has a accommodating cavity with an opening at one end, the electrode assembly is arranged in the accommodating cavity, the cover plate closes the opening, a pressure relief hole is opened on the bottom surface of the shell, the explosion-proof valve closes the pressure relief hole, the protective film is arranged on the surface of the explosion-proof valve located inside the shell, the sealing member presses the protective film to enhance the sealing of the explosion-proof valve, and the bottom support plate is located between the shell and the electrode assembly.

7. The battery cell according to claim 6, characterized in that: The electrode assembly comprises an electrode assembly body and an insulating film covering the outer side of the electrode assembly body, and a plurality of air holes are provided on the surface of the insulating film in contact with the bottom support plate.

8. The battery cell according to claim 6, characterized in that: The outer contour of the bottom surface of the exhaust portion surrounds the pressure relief hole and is spaced apart from the pressure relief hole.

9. A battery, characterized in that: A battery cell comprising the battery cell according to any one of claims 6 to 8.

10. An electrical device, characterized in that: A battery comprising the battery of claim 9.

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