Battery monomer, battery and electric device

Abstract

The utility model relates to a battery monomer, a battery and a power utilization device. The shell comprises a shell body and an end cover, and the end cover is provided with a mounting hole; the pole comprises a first conductive part and a second conductive part, and the second conductive part is arranged in the mounting hole in a penetrating manner; the adapter comprises a first adapter part and a second adapter part, the first adapter part and the first conductive part are stacked and electrically connected, and the second adapter part extends out of the first conductive part in the length direction of the end cover; the first insulating part is located between the end cover and the second switching part, the melting point of the first insulating part is K1, and K1 is larger than 250 DEG C; wherein the end cover is provided with a first easy-to-ignite area corresponding to the first conductive part and a second easy-to-ignite area corresponding to the second switching part, and in the thickness direction of the end cover, the orthographic projection of the first easy-to-ignite area and / or the orthographic projection of the second easy-to-ignite area fall into the orthographic projection range of the first insulating 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 at least one of the terminal and the adapter, creating a short circuit or even sparking. Sustained sparks can penetrate the end caps and cause the battery to combust, seriously endangering 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] an adapter, located on a side of the pole facing the housing, and comprising a first adapter portion and a second adapter portion, wherein the first adapter portion is stacked with the first conductive portion and electrically connected to the first conductive portion, and the second adapter portion extends out of the first conductive portion along the length direction of the end cap;

[0009] A first insulating member is located between the end cover and the second transition portion, wherein the melting point of the first insulating member is K1, and K1>250° C.;

[0010] In which, the end cover has a first ignition-prone area corresponding to the first conductive part, and a second ignition-prone area corresponding to the second transition part. In the thickness direction of the end cover, the orthographic projection of the first ignition-prone area and / or the second ignition-prone area falls within the orthographic projection range of the first insulating part.

[0011] In some embodiments, the first conductive portion has an ignition corner disposed along the length direction of the end cap and adjacent to the second adapter portion, the ignition corner corresponding to the first easy-ignition area one-to-one, and the first easy-ignition area is disposed toward the corresponding ignition corner;

[0012] The second transition portion has an edge area arranged along the width direction of the end cover, the second ignition-prone area corresponds to the edge area one by one, and the second ignition-prone area faces the corresponding edge area.

[0013] In some embodiments, the first insulating member is stacked between the end cover and the first conductive portion, and in the thickness direction of the end cover, the orthographic projections of the first ignition-prone area and the second ignition-prone area fall within the orthographic projection range of the first insulating member.

[0014] In some embodiments, a second insulating member is further included, wherein the melting point of the second insulating member is K2, K2 < K1;

[0015] The second insulating member is located between the end cover and the first conductive part, the first insulating member is stacked between the end cover and the second insulating member, and / or stacked between the second insulating member and the first conductive part, and / or stacked between the second insulating member and the first conductive part, and / or stacked between the second insulating member and the second adapter part; and in the thickness direction of the end cover, the orthographic projections of the first ignition-prone area and the second ignition-prone area fall within the orthographic projection range of the first insulating member.

[0016] In some embodiments, the first insulating member is stacked between the end cover and the second insulating member.

[0017] In some embodiments, the first insulating member is any one of a polyethylene terephthalate sheet, a thermoplastic polyimide sheet, a polytetrafluoroethylene sheet, a soluble polytetrafluoroethylene sheet, a mica sheet, and an alumina ceramic sheet.

[0018] In some embodiments, a third insulating member is further included. The third insulating member is sleeved outside the second conductive portion and is used to insulate the connection between the second conductive portion and the end cover.

[0019] 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 gap between the hole wall of the mounting hole and the second conductive portion.

[0020] A battery comprises a battery cell as described in any one of the above embodiments.

[0021] An electrical device includes the battery as described in the above embodiment, characterized in that the battery is used to provide electrical energy.

[0022] In the battery cell, battery, and electrical device described above, the melting point of the first insulating member is designed to be K1, K1 > 250°C, and the first insulating member is located between the end cap and the second adapter portion. In the thickness direction of the end cap, the orthographic projection of the first ignition-prone region and / or the second ignition-prone region falls within the orthographic projection of the first insulating member. Therefore, when the temperature inside the battery rises due to thermal runaway of the battery, although the temperature inside the battery is very high, the first insulating member is difficult to melt at high temperatures due to its high temperature resistance, and the insulating effect can be maintained. This can solve the problem of the insulating member melting when heated, causing the insulating member to lose its insulating protection. In this case, even if severe gas production within the battery cell causes high internal pressure and the end cap to bend, the first insulating member can always block the end cap between the first conductive portion of the terminal and / or between the end cap and the second adapter portion of the adapter, thereby preventing short circuit and ignition between the battery and the terminal, and / or short circuit and ignition between the end cap and the adapter, thereby improving the safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 An exploded view of a battery cell in one embodiment of the present application, wherein the first insulating member of the battery cell is stacked between the end cap and the first conductive portion, and the orthographic projections of the first ignition-prone region and the second ignition-prone region in the thickness direction of the end cap fall within the orthographic projection range of the first insulating member;

[0024] Figure 2 for Figure 1 A front cross-sectional view of the battery cell shown;

[0025] Figure 3 for Figure 2 An enlarged schematic diagram of a local structure A of a battery cell is shown;

[0026] Figure 4 An exploded view of a battery cell in another embodiment of the present application, wherein the first insulating member of the battery cell is stacked between the second insulating member and the first conductive portion, and the orthographic projections of the first ignition-prone area and the second ignition-prone area in the thickness direction of the end cap fall within the orthographic projection range of the first insulating member;

[0027] Figure 5 for Figure 4 An enlarged schematic diagram of a local structure B of a battery cell is shown;

[0028] Figure 6 for Figure 4 An enlarged schematic diagram of a local structure C of a battery cell is shown;

[0029] Figure 7 for Figure 4 A front cross-sectional view of the battery cell shown;

[0030] Figure 8 for Figure 7 An enlarged schematic diagram of a local structure D of a battery cell is shown;

[0031] Figure 9 An exploded view of a battery cell according to another embodiment of the present application, wherein the first insulating member of the battery cell is stacked between the second insulating member and the first conductive portion, and between the second insulating member and the second adapter portion, and in the thickness direction of the end cap, the orthographic projections of the first ignition-prone area and the second ignition-prone area fall within the orthographic projection of the first insulating member;

[0032] Figure 10 for Figure 9 A front cross-sectional view of the battery cell shown;

[0033] Figure 11 for Figure 10 An enlarged schematic diagram of the local structure of a battery cell is shown.

[0034] Figure Number:

[0035] 1. Battery cells;

[0036] 10. Housing; 20. Pole; 30. Adapter; 40. First insulating member; 50. Second insulating member; 60. Third insulating member; 70. Sealing member;

[0037] 11. Housing; 12. End cover; 122. Mounting hole;

[0038] 21. First conductive portion; 22. Second conductive portion; 23. Ignition corner;

[0039] 31. First transition portion; 32. Second transition portion; 321. First boundary; 322. Second boundary; 323. First edge region; 324. Second edge region;

[0040] 41. Insulation part;

[0041] X, length direction; Y, width direction; Z, thickness direction. DETAILED DESCRIPTION

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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 at least one of the terminal and the adapter, creating a short circuit or even sparking. Sustained sparks can penetrate the end caps and cause the battery to combust, seriously endangering battery safety.

[0050] Please refer again Figure 1 , and also see Figures 2 to 11In order to alleviate the above-mentioned problems, the applicant has conducted in-depth research and designed a battery cell 1, which includes a shell 10, a terminal 20, an adapter 30, an electrode assembly and a first insulating member 40. The shell 10 includes a shell 11 and an end cover 12. The end cover 12 is provided with a mounting hole 122 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 cover 12 facing the shell 11, and the second conductive portion 22 is passed through the mounting hole 122. The adapter 30 is located on the side of the terminal 20 facing the shell 11 and includes a first adapter portion 31 and a second adapter portion 32. The first adapter portion 31 is stacked with the first conductive portion 21 and is electrically connected to the first conductive portion 21. The second adapter portion 32 extends out of the first conductive portion 21 along the length direction X of the end cover 12. The electrode assembly is accommodated in the shell 11, and the electrode tab of the electrode assembly is electrically connected to the adapter 30. The first insulating member 40 is located between the end cap 12 and the second transition portion 32. The melting point of the first insulating member 40 is K1, where K1 is greater than 250°C. The end cap 12 has a first ignition-prone region corresponding to the first conductive portion 21 and a second ignition-prone region corresponding to the second transition portion 32. In the thickness direction Z of the end cap 12, the orthographic projection of the first ignition-prone region and / or the second ignition-prone region falls within the orthographic projection range of the first insulating member 40.

[0051] Combine Figure 1 , wherein the housing 10 refers to a component that isolates the internal environment of the battery cell 1 from the external environment. The shell 11 can be a hollow structure with one end open and the other end 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 shell 11 and corresponds one to one. The end caps 12 cover the corresponding openings of the shell 11. Optionally, the shell 11 and the end caps 12 can both 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, so that the battery cell 1 can have higher structural strength and improved safety performance.

[0052] The pole 20 is passed through the mounting hole 122 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 to output or input the electrical energy of the battery cell 1. There are usually two poles 20, one of which is the positive pole and the other is the negative pole. When the shell 11 is a hollow structure with one end open and the other end closed, and there is one end cover 12 that covers the opening of the shell 11, the positive pole and the negative pole 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 that respectively cover the corresponding openings of the shell 11, the positive pole and the negative pole are respectively arranged on the two end covers 12.

[0053] 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 both the positive electrode and the negative electrode are disposed on the same end cap 12. In this embodiment, two mounting holes 122 are defined in the end cap 12. The first conductive portions 21 of the positive electrode and the negative electrode are both located on the side of the end cap 12 facing the housing 11. The second conductive portion 22 of the positive electrode is disposed through one of the mounting holes 122, and the second conductive portion 22 of the negative electrode is disposed through the other mounting hole 122.

[0054] 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.

[0055] The adapter 30 is a conductive component in the battery cell 1 for electrically connecting the pole 20 and the tab. The adapter 30 is located on the side of the end cover 12 facing the inside of the shell 11 and is fixedly connected to the pole 20. The number of adapters 30 is the same as that of the pole 20 and they correspond one to one. Specifically, there are two adapters 30, which are respectively a positive pole adapter and a negative pole adapter. The positive pole adapter is used to electrically connect the positive tab to the positive pole, and the negative pole adapter is used to electrically connect the negative tab to the negative pole. Specifically, the first adapter portion 31 of the adapter 30 is electrically connected to the pole 20, and the second adapter portion 32 of the adapter 30 is electrically connected to the tab, or the opposite sides of the first adapter portion 31 of the adapter 30 are electrically connected to the pole 20 and the tab, respectively.

[0056] The melting point of the first insulating member 40 is K1, where K1 is greater than 250°C. For example, the first insulating member 40 can be any of a polyethylene terephthalate (PET) sheet, a thermoplastic polyimide (TPI) sheet, a polytetrafluoroethylene (PTFE) sheet, a soluble polytetrafluoroethylene (PFA) sheet, a mica sheet, and an alumina ceramic sheet. Insulating materials with a K1 greater than 250°C have excellent high-temperature resistance and can withstand high temperatures without melting and maintain insulation.

[0057] Among them, when the battery has thermal runaway, and the internal air pressure of the battery cell 1 increases and expands, causing the end cover 12 to deform and contact the first conductive part 21, the area is the first ignition-prone area on the end cover 12. When the battery has thermal runaway, and the internal air pressure of the battery cell 1 increases and expands, causing the end cover 12 to deform and contact the second adapter part 32, the area is the second ignition-prone area on the end cover 12.

[0058] To facilitate comparison of whether the orthographic projection of the first ignition-prone area and the orthographic projection of the second ignition-prone area fall within or outside the range of the orthographic projection of the first insulating member 40, a reference plane can be set. The reference plane is located below the battery cell 1 and is perpendicular to the thickness direction of the end cap 12. The first ignition-prone area, the second ignition-prone area, and the first insulating member 40 are all orthographically projected onto the reference plane along the thickness direction Z of the end cap 12. If the orthographic projections of the first ignition-prone area and the second ignition-prone area on the reference plane both fall within the range of the orthographic projection of the first insulating member 40, it means that the orthographic projections of the first ignition-prone area and the second ignition-prone area in the thickness direction Z of the end cap 12 fall within the range of the orthographic projection of the first insulating member 40.

[0059] Combine Figures 5 to 8 Taking the battery cell 1 having only one end cover 12 as an example, the area of the first conductive portion 21 of the end cover 12 facing both the positive electrode column and the negative electrode column forms a first ignition-prone area, and the area of the second adapter portion 32 of the end cover 12 facing both the positive electrode adapter and the negative electrode adapter forms a second ignition-prone area.

[0060] As an example, the first conductive portion 21 has an ignition corner 23 arranged along the length direction X of the end cover 12 and adjacent to the second adapter portion 32. The ignition corner 23 corresponds to the first easy-ignition area one-to-one, and the first easy-ignition area is arranged toward the corresponding ignition corner 23.

[0061] Typically, the first conductive portion 21 is rectangular and has four corners. In the length direction X of the end cap 12, two corners of the first conductive portion 21 are distal to the second transition portion 32, while the other two corners of the first conductive portion 21 are adjacent to the second transition portion 32, forming an ignition corner 23. The area of the end cap 12 facing the ignition corner 23 forms a first ignition-prone region. In an embodiment where the battery cell 1 includes only one end cap 12, the area of the end cap 12 facing each ignition corner 23 of each terminal 20 is configured to form a first ignition-prone region.

[0062] As an example, the second adapter portion 32 has an edge area arranged along the width direction Y of the end cover 12, and the second ignition-prone area corresponds one-to-one to the edge area, and the second ignition-prone area faces the corresponding edge area. That is to say, taking the second adapter portion 32 having a first boundary 321 and a second boundary 322 arranged relatively along the width direction Y of the end cover 12 as an example, in the width direction Y of the end cover 12, the first adapter portion 31 has a first edge area 323 adjacent to the first boundary 321, and has a second edge area 324 adjacent to the second boundary 322, and the areas on the end cover 12 facing the first edge area 323 and the second edge area 324 are all constructed to form the second ignition-prone area. In the embodiment where the battery cell 1 includes only one end cover 12, the areas of the end cover 12 facing each first edge area 323 and each second edge area 324 of each adapter 30 are all constructed to form the second ignition-prone area.

[0063] Combine Figure 5 and Figure 6 It is worth mentioning that in the present application, when the first easy-to-ignite area is arranged toward the corresponding ignition corner 23, the orthographic projection of the first easy-to-ignite area on the corresponding first conductive portion 21 at least partially overlaps with the corresponding ignition corner 23 (the orthographic projection of one of the first easy-to-ignite areas on the corresponding first conductive portion 21 is approximately as shown in FIG. Figure 5 The area indicated by the arrow M in the middle, the orthographic projection of another first ignition-prone area on the corresponding first conductive portion 21 is as follows Figure 5 When the second ignition-prone area faces the corresponding edge area, the orthographic projection of the second ignition-prone area on the corresponding second transition portion 32 at least partially overlaps with the corresponding edge area (the orthographic projection of one of the second ignition-prone areas on the corresponding second transition portion 32 is approximately as shown in FIG. Figure 6 The area indicated by the middle arrow R, the orthographic projection of another second ignition-prone area on the corresponding second adapter portion 32 is approximately as follows: Figure 6 The area pointed by the arrow S).

[0064] Combine Figure 3 、 Figure 8 and Figure 11 The first insulating member 40 is located between the end cover 12 and the second transition portion 32. For example, the first insulating member 40 is stacked between the end cover 12 and the first conductive portion 21, and is in direct contact with both the end cover 12 and the first conductive portion 21. And / or, the first insulating member 40 is stacked between the end cover 12 and the second transition portion 32, and is in direct contact with both the end cover 12 and the second transition portion 32.

[0065] In conventional battery cells 1, the insulating material on the side of the end cap 12 facing the housing 11 is typically made of polypropylene (commonly known as PP). This insulating material easily melts and decomposes under continuous heat, losing its protective function. Furthermore, during thermal runaway, severe gas production within the battery cell 1 leads to high internal pressure, which can cause severe bending of the end cap 12. Losing insulation, the end cap 12 and the terminal 20, as well as the adapter 30, can come into contact, causing a short circuit and sparking.

[0066] In the present application, the melting point of the first insulating member 40 is designed to be K1, K1>250°C, and the first insulating member 40 is located between the end cover 12 and the second adapter portion 32. In the thickness direction Z of the end cover 12, the orthographic projection of the first ignition-prone area and / or the second ignition-prone area falls within the orthographic projection range of the first insulating member 40. Therefore, when the battery thermal runaway causes the temperature inside the battery to rise, although the temperature inside the battery is very high, due to the high temperature resistance of the first insulating member 40, the first insulating member 40 is difficult to melt at high temperature and can maintain the insulation effect, which can solve the problem of the insulating member melting when heated and causing the insulating member to lose insulation protection. In this case, even if the gas production in the battery cell 1 is serious and the internal air pressure is very high, causing the end cover 12 to bend, the first insulating part 40 can always block between the end cover 12 and the first conductive part 21 of the pole 20, and / or block between the end cover 12 and the second adapter part 32 of the adapter 30, so as to avoid short circuit and spark between the battery and the pole 20, and / or short circuit and spark between the end cover 12 and the adapter 30, thereby helping to improve the safety of the battery.

[0067] like Figures 1 to 3 As shown, in some optional implementations, the first insulating member 40 is stacked between the end cover 12 and the first conductive portion 21 , and in the thickness direction Z of the end cover 12 , the orthographic projections of the first ignition-prone area and the second ignition-prone area fall within the orthographic projection range of the first insulating member 40 .

[0068] In this embodiment, the first insulating member 40 between the end cap 12 and the positive electrode column, and the first insulating member 40 between the end cap 12 and the negative electrode column may be spaced apart, or may be connected to form a whole.

[0069] The first insulating member 40 formed by this design has a wide coverage area and good insulation effect, which can effectively reduce the risk of fire.

[0070] like Figure 4 、 Figures 7 to 11As shown, in some optional embodiments, the battery cell 1 further includes a second insulating member 50 (usually made of plastic material, i.e., the insulating member mentioned above), the melting point of the second insulating member 50 is K2, K2 < K1; the second insulating member 50 is located between the end cover 12 and the first conductive portion 21, the first insulating member 40 is stacked between the end cover 12 and the second insulating member 50, and / or stacked between the second insulating member 50 and the first conductive portion 21 (as shown in FIG. Figure 8 and Figure 11 ), and / or stacked on the second insulating member 50 and the second transition portion 32 (as shown Figure 11 In the thickness direction Z of the end cover 12 , the orthographic projections of the first ignition-prone region and the second ignition-prone region fall within the orthographic projection range of the first insulating member 40 .

[0071] Among them, Figure 4 For example, the first insulating member 40 may be a whole piece, or Figure 9 As shown, the first insulating member 40 may also be a multi-piece type, which can be set specifically according to needs.

[0072] For example, Figure 4 and Figure 8 As shown, taking the first insulating member 40 as a whole piece as an example, the whole piece of the first insulating member 40 is stacked between the second insulating member 50 and the first conductive portion 21. For another example, Figure 9 and Figure 11 As shown, taking the first insulating member 40 as a multi-piece type as an example, the first insulating member 40 includes three insulating portions 41, wherein one insulating portion 41 is stacked between the second insulating member 50 and the first conductive portion 21, another insulating portion 41 is stacked between the second insulating member 50 and the first edge area 323 of the second transition portion 32, and the last insulating portion 41 is stacked between the second insulating member 50 and the second edge area 324 of the second transition portion 32.

[0073] The second insulating member 50 works in conjunction with the first insulating member 40 to effectively enhance insulation. As for the first insulating member 40, whether it is a single piece or multiple pieces, even after the second insulating member 50 melts and decomposes, the first insulating member 40 can still be positioned between the end cap 12 and the adapter 30 to provide insulation and a barrier, resulting in excellent insulation and reducing the risk of ignition of the end cap 12. Furthermore, if the first insulating member 40 is multiple pieces, positioning the multiple insulating portions 41 of the first insulating member 40 in key locations prone to ignition can reduce the amount of material used in the first insulating member 40, thereby reducing costs.

[0074] Furthermore, in some optional embodiments, the first insulating member 40 is only stacked between the end cap 12 and the second insulating member 50. In this embodiment, while ensuring the insulation effect, the number of first insulating members 40 is reduced, the manufacturing process of the battery cell 1 is simpler, and the manufacturing cost is lower.

[0075] like Figures 1 to 3 As shown, in some optional embodiments, the battery cell 1 also includes a third insulating member 60 (usually made of plastic material), which is sleeved outside the second conductive part 22 and is used to insulate the second conductive part 22 and the end cover 12 to prevent the end cover 12 from contacting the second conductive part 22 and conducting electricity, thereby ensuring the safety of the battery cell 1.

[0076] The number of the third insulating members 60 is the same as the number of the poles 20 and corresponds one to one.

[0077] In some optional embodiments, the battery cell 1 further includes a seal 70, which is at least partially located within the mounting hole 122 and is used to seal the gap between the hole wall of the mounting hole 122 and the second conductive portion 22. The seal 70 can seal the gap between the hole wall of the mounting hole 122 and the second conductive portion 22 provided through the corresponding mounting hole 122 to prevent the electrolyte, gas, etc. within the housing 11 from leaking to the outside through this gap.

[0078] The number of the sealing members 70 is the same as the number of the poles 20 and corresponds one to one.

[0079] 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.

[0080] The battery in this application has the effects of any of the above embodiments, so it will not be described here in detail.

[0081] 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.

[0082] The battery in this application has the effects described in any of the above embodiments, so they will not be described in detail here.

[0083] 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.

[0084] 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.

[0085] The above-mentioned battery cell 1, battery and electrical device are designed to have a melting point of K1 of the first insulating member 40, K1>250°C, and the first insulating member 40 is located between the end cover 12 and the second adapter portion 32. In the thickness direction Z of the end cover 12, the orthographic projection of the first ignition-prone area and / or the second ignition-prone area falls within the orthographic projection range of the first insulating member 40. Therefore, when the battery thermal runaway causes the temperature inside the battery to rise, although the temperature inside the battery is very high, due to the high temperature resistance of the first insulating member 40, the first insulating member 40 is difficult to melt at high temperature, and can maintain the insulation effect, which can solve the problem of the insulating member melting when heated and causing the insulating member to lose insulation protection. In this case, even if the gas production in the battery cell 1 is serious and the internal air pressure is very high, causing the end cover 12 to bend, the first insulating part 40 can always block between the end cover 12 and the first conductive part 21 of the pole 20, and / or block between the end cover 12 and the second adapter part 32 of the adapter 30, so as to avoid short circuit and spark between the battery and the pole 20, and / or short circuit and spark between the end cover 12 and the adapter 30, thereby helping to improve the safety of the battery.

[0086] 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.

[0087] 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 (122) 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 (122); An adapter (30) is located on a side of the pole (20) facing the housing (11), and comprises a first adapter portion (31) and a second adapter portion (32), wherein the first adapter portion (31) is stacked with the first conductive portion (21) and is electrically connected to the first conductive portion (21), and the second adapter portion (32) extends out of the first conductive portion (21) along a length direction (X) of the end cover (12); A first insulating member (40) is located between the end cover (12) and the second transition portion (32), wherein the melting point of the first insulating member (40) is K1, and K1>250° C.; The end cover (12) has a first ignition-prone area corresponding to the first conductive portion (21), and a second ignition-prone area corresponding to the second transition portion (32), and in the thickness direction (Z) of the end cover (12), the orthographic projection of the first ignition-prone area and / or the second ignition-prone area falls within the orthographic projection range of the first insulating member (40).

2. The battery cell according to claim 1, wherein: The first conductive portion (21) has an ignition corner (23) arranged along the length direction (X) of the end cover (12) and adjacent to the second transition portion (32), the ignition corner (23) corresponding to the first easy-ignition area one-to-one, and the first easy-ignition area is arranged toward the corresponding ignition corner (23); The second transition portion (32) has an edge area arranged along the width direction (Y) of the end cover (12), the second ignition-prone area corresponds to the edge area one-to-one, and the second ignition-prone area faces the corresponding edge area.

3. The battery cell according to claim 1, wherein: The first insulating member (40) is stacked between the end cover (12) and the first conductive portion (21), and in the thickness direction (Z) of the end cover (12), the orthographic projections of the first ignition-prone area and the second ignition-prone area fall within the orthographic projection range of the first insulating member (40).

4. The battery cell according to claim 1, wherein: It also includes a second insulating member (50), wherein the melting point of the second insulating member (50) is K2, K2 < K1; The second insulating member (50) is located between the end cover (12) and the first conductive portion (21), the first insulating member (40) is stacked between the end cover (12) and the second insulating member (50), and / or stacked between the second insulating member (50) and the first conductive portion (21), and / or stacked between the second insulating member (50) and the first conductive portion (21), and / or stacked between the second insulating member (50) and the first conductive portion (21), and / or stacked between the second insulating member (50) and the second transition portion (32); and in the thickness direction (Z) of the end cover (12), the orthographic projections of the first ignition-prone area and the second ignition-prone area fall within the orthographic projection range of the first insulating member (40).

5. The battery cell according to claim 4, characterized in that The first insulating member (40) is stacked between the end cover (12) and the second insulating member (50).

6. The battery cell according to claim 1, characterized in that The first insulating member (40) is any one of a polyethylene terephthalate sheet, a thermoplastic polyimide sheet, a polytetrafluoroethylene sheet, a soluble polytetrafluoroethylene sheet, a mica sheet, and an alumina ceramic sheet.

7. The battery cell according to claim 1, characterized in that The invention also includes a third insulating member (60), which is sleeved outside the second conductive part (22) and is used to insulate and connect the second conductive part (22) and the end cover (12).

8. The battery cell according to claim 1, wherein: The invention also includes a sealing member (70), wherein the sealing member (70) is at least partially located in the mounting hole (122) and is used to seal the gap between the hole wall of the mounting hole (122) and the second conductive part (22).

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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