Battery monomer, battery and electric device

Abstract

The utility model relates to a battery monomer, a battery and a power utilization device. The battery monomer comprises: a housing comprising a shell and an end cover, and the end cover is provided with a mounting hole in a penetrating manner along the thickness direction of the end cover; the pole comprises a first conductive part and a second conductive part which is convexly arranged on one side of the first conductive part, the first conductive part is positioned on one side, facing the shell, of the end cover, and the second conductive part is arranged in the mounting hole in a penetrating manner; wherein the end cover is provided with an easy-to-ignite area corresponding to the first conductive part, and in the thickness direction of the end cover, the orthographic projection of the easy-to-ignite area falls outside the orthographic projection of the first conductive part. According to the battery monomer, the battery and the power utilization device provided by the invention, the safety can be improved.

Description

Technical Field

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

[0002] With the development of battery technology, batteries have been widely used in various fields due to their advantages such as better environmental protection, long battery life and high cost performance.

[0003] Batteries consist of multiple cells. When thermal runaway occurs, the temperature inside the battery rises rapidly to extremely high levels, causing the insulation on the end caps facing the battery housing to melt and lose its insulating effect. Simultaneously, the end caps, affected by the heat and the internal pressure of the battery cells, can deform, causing them to contact the terminals and create a short circuit, potentially leading to sparks. Sustained sparks can penetrate the end caps and cause the battery to combust, seriously compromising battery safety. Utility Model Content

[0004] Therefore, it is necessary to provide a battery cell, a battery and an electrical device that can improve safety in order to address the above problems.

[0005] A battery cell, comprising:

[0006] The housing comprises a shell and an end cover, wherein the end cover is provided with a mounting hole extending through the end cover along the thickness direction thereof;

[0007] The pole comprises a first conductive portion and a second conductive portion protruding from one side of the first conductive portion, wherein the first conductive portion is located on a side of the end cover facing the housing, and the second conductive portion is passed through the mounting hole;

[0008] The end cover has an ignition-prone area corresponding to the first conductive portion, and in the thickness direction of the end cover, the orthographic projection of the ignition-prone area falls outside the orthographic projection of the first conductive portion.

[0009] In some embodiments, there are multiple ignition-prone areas, which correspond one-to-one to the corner areas of the first conductive part. In the thickness direction of the end cover, the orthographic projection of the ignition-prone area falls outside the orthographic projection of the corresponding corner area on the first conductive part.

[0010] In some embodiments, a corner surface at at least one corner of the first conductive portion is an arc surface, and a radius of the arc surface is R1, 10 mm ≤ R1 ≤ 15 mm.

[0011] In some embodiments, a corner surface at at least one corner of the first conductive portion is an arc surface, and a corner surface at at least one corner of the first conductive portion is an inclined surface.

[0012] In some embodiments, the surface of the end cap facing the housing is recessed to form a limiting groove, the limiting groove is communicated with the mounting hole, the limiting groove is adapted to the first conductive portion, and the first conductive portion is at least partially limited in the limiting groove;

[0013] The corners of the first conductive portion correspond one-to-one to the corners of the limiting groove, and the distance between the corner surface at the corner of the first conductive portion and the corner surface at the corresponding corner in the limiting groove is L, 4.14mm≤L≤6.21mm.

[0014] In some embodiments, the corner surfaces at at least two corners of the first conductive portion are different, and the corner surfaces at at least two corners of the limiting groove are different.

[0015] In some embodiments, the first conductive portion is circular, and the radius of the first conductive portion is R2, 10 mm ≤ R2 ≤ 15 mm;

[0016] Alternatively, the first conductive portion is a regular hexagon, and the radius of the first conductive portion is R3, 10 mm ≤ R3 ≤ 15 mm.

[0017] Some of the embodiments further include a sealing member, which is at least partially located in the mounting hole and is used to seal the second conductive portion and the end cover.

[0018] A battery comprises a battery cell as described in any one of the above embodiments.

[0019] An electrical device includes the battery as described in the above embodiment, characterized in that the battery is used to provide electrical energy.

[0020] In the above-mentioned battery cell, battery and electrical device, the orthographic projection of the ignition-prone area falls outside the orthographic projection of the first conductive part in the thickness direction of the end cover. Therefore, when the first insulating part melts and the end cover is deformed by the high temperature and the air pressure inside the battery cell, the ignition-prone area of the end cover is also less likely to contact the first conductive part of the pole, thereby reducing the risk of short circuit due to contact between the end cover and the pole, and improving the safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 An exploded view of a battery cell according to an embodiment of the present application;

[0022] Figure 2 for Figure 1 The cross-sectional view of the battery cells after assembly along the AA direction is shown;

[0023] Figure 3 for Figure 2 An enlarged schematic diagram of a local structure B of a battery cell is shown;

[0024] Figure 4 for Figure 1 A schematic structural diagram of the first conductive portion of the electrode in the battery cell shown;

[0025] Figure 5 for Figure 4 A bottom view of the first conductive portion and the limiting groove shown;

[0026] Figure 6 This is a bottom view of the first conductive portion and the limiting groove in another embodiment of the present application;

[0027] Figure 7 This is a bottom view of the first conductive portion and the limiting groove in another embodiment of the present application;

[0028] Figure 8 This is a bottom view of the first conductive portion and the limiting groove in another embodiment of the present application.

[0029] Figure Number:

[0030] 1. Battery cells;

[0031] 10. Housing; 20. Pole; 30. Adapter; 40. First insulating member; 50. Second insulating member; 60. Sealing member;

[0032] 11. Housing; 12. End cover; 121. Mounting hole; 122. Limiting groove; 123. Second corner surface;

[0033] 21. First conductive portion; 211. Corner region; 212. First corner surface; 22. Second conductive portion;

[0034] Z, thickness direction. DETAILED DESCRIPTION

[0035] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0036] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0038] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0039] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0040] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0041] Currently, market developments indicate that batteries are increasingly being used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As battery applications continue to expand, market demand is also growing.

[0042] Batteries consist of multiple cells. When thermal runaway occurs, the temperature inside the battery rises rapidly to extremely high levels, causing the insulation on the end caps facing the battery housing to melt and lose its insulating effect. Simultaneously, the end caps, affected by the heat and the internal pressure of the battery cells, can deform, causing contact between the end caps and the terminals, resulting in a short circuit and even sparks. Sustained sparks can penetrate the end caps and cause the battery to combust, seriously compromising battery safety.

[0043] Please also refer to Figure 1 、 Figure 2 and Figure 3 To alleviate the above-mentioned problems, the applicant, after in-depth research, has designed a battery cell 1, which includes a housing 10, a terminal 20, an electrode assembly, an adapter 30, and a first insulating member 40. The housing 10 includes a shell 11 and an end cap 12. The end cap 12 is provided with a mounting hole 121 extending through the end cap 12 along its thickness direction Z. The terminal 20 includes a first conductive portion 21 and a second conductive portion 22 protruding from one side of the first conductive portion 21. The first conductive portion 21 is located on the side of the end cap 12 facing the shell 11, and the second conductive portion 22 is provided through the mounting hole 121. The end cap 12 has an ignition-prone area corresponding to the first conductive portion 21. In the thickness direction Z of the end cap 12, the orthographic projection of the ignition-prone area falls outside the orthographic projection of the first conductive portion 21. The adapter 30 and the electrode assembly are both housed in the shell 11, and the electrode lug of the electrode assembly is electrically connected to the adapter 30. The first insulating member 40 is provided between the end cap 12 and the first conductive portion 21.

[0044] The housing 10 is a component that isolates the internal environment of the battery cell 1 from the external environment. The housing 11 can be a hollow structure with one end open and the other closed, or it can be a hollow structure with both ends open. The number of end caps 12 is the same as the number of openings in the housing 11 and corresponds one-to-one. The end caps 12 cover the corresponding openings in the housing 11. Optionally, both the housing 11 and the end caps 12 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end caps 12 are less likely to deform when squeezed or collided, thereby providing the battery cell 1 with higher structural strength and improved safety performance.

[0045] The pole 20 is passed through the mounting hole 121 on the end cover 12 and is connected to the end cover 12 by injection molding, riveting, etc. In addition, the pole 20 is also connected to the pole ear of the electrode assembly through the adapter 30 for outputting or inputting the electrical energy of the battery cell 1. There are usually two poles 20, one of which is the positive pole 20 and the other is the negative pole 20. When the shell 11 is a hollow structure with one end open and the other end closed, and there is one end cover 12 and it covers the opening of the shell 11, the positive pole 20 and the negative pole 20 are arranged on the same end cover 12. When the shell 11 is a hollow structure with both ends open, there are two end covers 12 and they respectively cover the corresponding openings of the shell 11, the positive pole 20 and the negative pole 20 are respectively arranged on the two end covers 12.

[0046] For ease of explanation, the following embodiments are described using an example in which the housing 11 is a hollow structure with one end open and the other closed, and the positive electrode column 20 and the negative electrode are both disposed on the same end cap 12. In this embodiment, the end cap 12 has two mounting holes 121 defined therein. The first conductive portions 21 of the positive electrode column 20 and the negative electrode column 20 are both located on the side of the end cap 12 facing the housing 11. The second conductive portion 22 of the positive electrode column 20 is disposed through one of the mounting holes 121, and the second conductive portion 22 of the negative electrode column 20 is disposed through the other mounting hole 121.

[0047] The electrode assembly is the component in the battery cell 1 where the electrochemical reaction occurs. The electrode assembly is mainly formed by winding or stacking the positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly, and the parts of the positive and negative electrode sheets without active materials each constitute the tabs. The positive and negative electrode tabs can be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery, the positive and negative electrode active materials react with the electrolyte, and the tabs are connected to the pole 20 through the adapter 30 to form a current loop.

[0048] The adapter 30 is a conductive component in the battery cell 1 that electrically connects the terminal 20 and the tab. The adapter 30 is located on the side of the terminal 20 facing the housing 11 and is fixedly connected to the terminal 20. There are the same number of adapters 30 as there are terminals 20, and they correspond one to one. Specifically, there are two adapters 30, one for the positive terminal and one for the negative terminal. The positive adapter 30 is used to electrically connect the positive tab to the positive terminal 20, and the negative adapter 30 is used to electrically connect the negative tab to the negative terminal 20.

[0049] The first insulating member 40 is used to insulate the first conductive portion 21 of the electrode 20 from the end cap 12 to prevent short circuits caused by contact between the end cap 12 and the electrode 20. For example, in a case where the housing 11 is a hollow structure with one end open and the other closed, and both the positive electrode 20 and the negative electrode 20 are mounted on the same end cap 12, the first insulating member 40 is insulated between the first conductive portion 21 of the positive electrode 20 and the end cap 12, and between the first conductive portion 21 of the negative electrode 20 and the end cap 12.

[0050] When thermal runaway occurs in the battery, causing the first insulating member 40 to melt, and the internal air pressure of the battery cell 1 increases and expands, the area on the end cover 12 that is easily deformed and contacts the first conductive portion 21 of the pole 20 is the ignition-prone area on the end cover 12 corresponding to the pole 20.

[0051] Among them, in order to facilitate the comparison of whether the orthographic projection of the easy-to-ignite area falls inside or outside the orthographic projection of the first conductive part 21, the plane where the surface of the first conductive part 21 facing the shell 11 is located can be used as a reference plane, and the easy-to-ignite area and the first conductive part 21 are both orthographically projected onto the reference plane along the thickness direction Z of the end cover 12, and if the orthographic projections of the easy-to-ignite area and the first conductive part 21 on the reference plane do not overlap, it means that in the thickness direction Z of the end cover 12, the orthographic projection of the easy-to-ignite area falls outside the orthographic projection of the first conductive part 21.

[0052] In the present application, in the thickness direction Z of the end cover 12, the orthographic projection of the ignition-prone area falls outside the orthographic projection of the first conductive part 21. Therefore, when the first insulating part 40 melts and the end cover 12 is deformed by the high temperature and the air pressure in the battery cell 1, the ignition-prone area of the end cover 12 is also difficult to contact the first conductive part 21 of the pole 20, thereby reducing the risk of short circuit due to contact between the end cover 12 and the pole 20, and improving the safety of the battery.

[0053] See also Figures 1 to 4 In some optional embodiments, there are multiple ignition-prone areas, which correspond one-to-one to the corner areas 211 of the first conductive part 21. In the thickness direction Z of the end cover 12, the orthographic projection of the ignition-prone area falls outside the orthographic projection of the corner area 211 on the corresponding first conductive part 21, thereby reducing the risk of the end cover 12 contacting the first conductive part 21 and causing a short circuit and ignition when deformed, thereby improving the safety of the battery.

[0054] Specifically, the outer edge of the end cover 12 has a large curvature, and is more likely to come into contact with the first conductive portion 21 of the pole 20 and form an ignition-prone area.

[0055] As an example, the first conductive part 21 usually has four corner areas 211, and there are four ignition-prone areas on the end cover 12, which correspond one-to-one to the four corner areas 211. In the thickness direction Z of the end cover 12, the orthographic projection of each ignition-prone area falls outside the corresponding corner area 211, but is close to the orthographic projection of the corresponding corner area 211.

[0056] In some optional embodiments, the corner surface at at least one corner of the first conductive portion 21 is an arc surface, and the radius of the arc surface is R1, 10 mm≤R1≤15 mm.

[0057] As an example, in this embodiment, the corner surfaces at the four corners of the first conductive part 21 can all be arc surfaces, and the radius satisfies the condition of 10mm≤R1≤15mm; or, the corner surfaces at three corners of the first conductive part 21 can all be arc surfaces, and the radius satisfies the condition of 10mm≤R1≤15mm, and the corner surface at the fourth corner can be a sloped surface. The specific setting method can be set according to needs.

[0058] In a traditional battery cell 1, the first conductive part 21 is a structure similar to a rectangle or a square, and the corner surfaces at the four corners of the first conductive part 21 are arc surfaces, and the radius of the corner surface is in the range of 0mm to 5mm. In the present application, by setting the corner surface at at least one corner of the first conductive part 21 to be an arc surface, and the radius of the arc surface is R1, 10mm≤R1≤15mm, that is, the radius of the corner surface in the present application is increased compared to the radius of the traditional corner surface. Compared with the traditional pole 20, the corner surface at the corner of the present application is retracted (after retraction, the cross-sectional area of the first conductive part 21 in the thickness direction Z of the vertical end cover 12 is reduced) while the installation position of the pole 20 remains unchanged. This method is equivalent to achieving the avoidance of the corner area 211 from the ignition-prone area by retracting the corner surface. Therefore, even if the end cover 12 is deformed during thermal runaway, it is difficult for it to contact the corner area 211 whose corner surface is an arc surface and whose radius is in the range of 10 mm to 15 mm, thereby achieving the purpose of improving safety.

[0059] In some optional embodiments, the corner surface at at least one corner of the first conductive part 21 is an arc surface, and the corner surface at at least one corner of the first conductive part 21 is an inclined surface. For example, the corner surfaces at the three corners of the first conductive part 21 are arc surfaces, and the radius of the arc surface satisfies the condition 10mm≤R1≤15mm, and the corner surface at the fourth corner of the first conductive part 21 is an inclined surface. Since the corner surfaces and the inclined surfaces have different structures, during the actual installation process, a smaller number of arc surfaces or inclined surfaces are used for fool-proof installation. For example, the corner surfaces at the three corners of the first conductive part 21 are arc surfaces, and the corner surface at the fourth corner of the first conductive part 21 is an inclined surface. A mounting surface that cooperates with the inclined surface can be constructed on the end plate. During actual installation, the inclined surface can be used to cooperate with the mounting surface, and the pole 20 can be positioned and fool-proofed for easy and quick installation.

[0060] Please refer again Figure 3 , and also see Figure 5 and Figure 6 In some optional embodiments, the surface of the end cover 12 facing the shell 11 is recessed to form a limiting groove 122, the limiting groove 122 is connected to the mounting hole 121, the limiting groove 122 is adapted to the first conductive part 21, and the first conductive part 21 is at least partially limited in the limiting groove 122; the corner of the first conductive part 21 corresponds one-to-one to the corner of the limiting groove 122, and the spacing between the corner surface at the corner of the first conductive part 21 and the corner surface at the corresponding corner in the limiting groove 122 is L, 4.14mm≤L≤6.21mm.

[0061] For the convenience of numbering, the corner surface of the first conductive portion 21 is defined as a first corner surface 212 , and the corner surface of the limiting groove 122 is defined as a second corner surface 123 .

[0062] The number of the limiting grooves 122 is equal to and corresponds to the number of the mounting holes 121 , and the limiting grooves 122 are used to facilitate the limiting and positioning installation of the first conductive portion 21 .

[0063] For the traditional adapter 30, the first conductive part 21 and the limiting groove 122 both have four corners, and the spacing between the corner surface at the corner of the first conductive part 21 and the corner surface at the corresponding corner in the limiting groove 122 is between 0mm-2.07mm. Within this spacing range, when the end cover 12 is bent, the ignition-prone area can easily contact the corner area 211 of the first conductive part 21. In the present application, by designing the corner surface at the corner of the first conductive part 21, the spacing between the corner surface at the corresponding corner in the limiting groove 122 is L, 4.14mm≤L≤6.21mm, and by increasing the spacing between the corner surface at the corner of the first conductive part 21 and the corner surface at the corresponding corner in the limiting groove 122, it is equivalent to the corner surface at the corner of the first conductive part 21 in the present application shrinking (after shrinking, the cross-sectional area of the first conductive part 21 in the thickness direction Z perpendicular to the end cover 12 is reduced), so as to achieve the avoidance between the corner area 211 of the first conductive part 21 in the present application and the ignition-prone area. Therefore, when thermal runaway occurs and the end cover 12 is deformed, even if the ignition-prone area on the end cover 12 is deformed, it is difficult to contact the corner area 211 of the first conductive part 21, thereby improving the safety of the battery.

[0064] Please refer to the figure again Figure 5 In some optional embodiments, the corner surfaces at at least two corners of the first conductive portion 21 are different, and the corner surfaces at at least two corners of the limiting groove 122 are different.

[0065] For example, if the corner surfaces at the three corners of the first conductive portion 21 are all arcuate surfaces, while the corner surface at the fourth corner is an inclined surface, then correspondingly, the corner surfaces at the three corners of the limiting groove 122 are also all arcuate surfaces, while the corner surface at the fourth corner of the limiting groove 122 is an inclined surface. By utilizing the inclined surfaces at the corners of the first conductive portion 21 and the inclined surfaces at the corners of the limiting groove 122, positioning and foolproof installation of the pole 20 can be achieved.

[0066] It can be understood that the inclined surface at the corner of the limiting groove 122 can be constructed to form the above-mentioned installation surface.

[0067] Please refer again Figure 3 , and also see Figure 7 and Figure 8 In some optional embodiments, the first conductive portion 21 is circular, and the radius of the first conductive portion 21 is R2, 10mm≤R2≤15mm; or the first conductive portion 21 is a regular hexagon, and the radius of the first conductive portion 21 is R3, 10mm≤R3≤15mm. It is understood that when the first conductive portion 21 is a regular hexagon, the radius of the first conductive portion 21 is the radius of the circumscribed circle of the first conductive portion 21.

[0068] In this embodiment, when the first conductive portion 21 is circular, the center of the first conductive portion 21 coincides with the center of an arc surface at at least one corner of the first conductive portion 21, where the corner surface is an arc surface and the radius of the arc surface is R1. When the first conductive portion 21 is hexagonal, the center of the circumscribed circle of the hexagon coincides with the center of an arc surface at at least one corner of the first conductive portion 21, where the corner surface is an arc surface and the radius of the arc surface is R1.

[0069] In this embodiment, compared to the conventional pole 20, the present application, while maintaining the same mounting position of the pole 20, is equivalent to retracting the first conductive portion 21 in the present application (after retraction, the cross-sectional area of the first conductive portion 21 in the thickness direction Z perpendicular to the end cap 12 is reduced). In other words, this approach is equivalent to retracting the first conductive portion 21 to avoid the ignition-prone area. Therefore, even if the end cap 12 deforms during thermal runaway, it is difficult for it to come into contact with the first conductive portion 21, thereby achieving the purpose of improving safety.

[0070] Please refer again Figures 1 to 3 In some optional embodiments, the battery cell 1 further includes a second insulating member 50, which is sleeved outside the second conductive portion 22 and is used to insulate the second conductive portion 22 and the end cover 12 to prevent the end cover 12 from contacting the second conductive portion 22 and conducting electricity, thereby ensuring the safety of the battery cell 1.

[0071] The number of the second insulating members 50 is the same as the number of the poles 20 and corresponds one to one.

[0072] In some optional embodiments, the battery cell 1 further includes a seal 60, which is at least partially located within the mounting hole 121 and is used to seal the gap between the hole wall of the mounting hole 121 and the second conductive portion 22. The seal 60 can seal the gap between the hole wall of the mounting hole 121 and the second conductive portion 22 provided through the corresponding mounting hole 121 to prevent the electrolyte, gas, etc. within the housing 11 from leaking to the outside through this gap.

[0073] The number of the sealing members 60 is the same as the number of the poles 20 and corresponds one to one.

[0074] The present application also provides a battery, comprising a battery cell 1 as described in any one of the above embodiments, wherein the battery comprises a plurality of battery cells 1, and the battery cells 1 can be connected in series, in parallel, or in a mixed manner.

[0075] The battery in this application has the effects of any of the above embodiments, so it will not be described here in detail.

[0076] The present application also provides an electrical device, which includes a battery as described in any one of the above embodiments, and the battery is used to provide electrical energy.

[0077] The battery in this application has the effects described in any of the above embodiments, so they will not be described in detail here.

[0078] The electrical devices may include, but are not limited to, mobile phones, tablets, laptop computers, electric toys, electric tools, battery-powered vehicles, electric cars, ships, spacecraft, etc. Electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0079] It should be understood that the technical solutions described in the embodiments of the present application are not limited to being applicable to the electrical devices described above.

[0080] In the thickness direction Z of the end cover 12, the orthographic projection of the ignition-prone area of the above-mentioned battery cell 1, battery and electrical device falls outside the orthographic projection of the first conductive portion 21. Therefore, when the first insulating member 40 melts and the end cover 12 is deformed by the high temperature and the air pressure inside the battery cell 1, the ignition-prone area of the end cover 12 is less likely to contact the first conductive portion 21 of the terminal 20, thereby reducing the risk of short circuit due to contact between the end cover 12 and the terminal 20 and improving the safety of the battery.

[0081] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0082] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A battery cell, characterized in that: The battery cell comprises: The housing (10) comprises a shell (11) and an end cover (12), wherein the end cover (12) is provided with a mounting hole (121) extending through the end cover (12) along a thickness direction (Z); A pole (20) comprising a first conductive portion (21) and a second conductive portion (22) protruding from one side of the first conductive portion (21), wherein the first conductive portion (21) is located on a side of the end cover (12) facing the housing (11), and the second conductive portion (22) is passed through the mounting hole (121); The end cover (12) has an ignition-prone area corresponding to the first conductive portion (21), and in the thickness direction (Z) of the end cover (12), the orthographic projection of the ignition-prone area falls outside the orthographic projection of the first conductive portion (21).

2. The battery cell according to claim 1, wherein: There are multiple ignition-prone areas, which correspond one-to-one to the corner areas (211) of the first conductive part (21). In the thickness direction (Z) of the end cover (12), the orthographic projection of the ignition-prone area falls outside the orthographic projection of the corresponding corner area (211) on the first conductive part (21).

3. The battery cell according to claim 2, characterized in that: The corner surface at at least one corner of the first conductive portion (21) is an arc surface, and the radius of the arc surface is R1, 10mm≤R1≤15mm.

4. The battery cell according to claim 3, characterized in that The corner surface at at least one corner of the first conductive portion (21) is an arc surface, and the corner surface at at least one corner of the first conductive portion (21) is an inclined surface.

5. The battery cell according to claim 1, characterized in that The surface of the end cover (12) is recessed toward the housing (11) to form a limiting groove (122), the limiting groove (122) is communicated with the mounting hole (121), the limiting groove (122) is adapted to the first conductive portion (21), and the first conductive portion (21) is at least partially limited in the limiting groove (122); The corners of the first conductive portion (21) correspond one-to-one to the corners of the limiting groove (122), and the spacing between the corner surface at the corner of the first conductive portion (21) and the corner surface at the corresponding corner in the limiting groove (122) is L, 4.14mm≤L≤6.21mm.

6. The battery cell according to claim 5, characterized in that The corner surfaces at at least two corners of the first conductive portion (21) are different, and the corner surfaces at at least two corners of the limiting groove (122) are different.

7. The battery cell according to claim 1, characterized in that The first conductive portion (21) is circular, and the radius of the first conductive portion (21) is R2, 10mm≤R2≤15mm; Alternatively, the first conductive portion (21) is a regular hexagon, and the radius of the first conductive portion (21) is R3, 10mm≤R3≤15mm.

8. The battery cell according to claim 1, wherein: The invention also includes a sealing member (60), wherein the sealing member (60) is at least partially located in the mounting hole (121) and is used for sealingly connecting the second conductive portion (22) and the end cover (12).

9. A battery, characterized in that: The battery cell comprises the battery cell according to any one of claims 1 to 8.

10. An electrical device comprising the battery according to claim 9, characterized in that: The battery is used to provide electrical energy.

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