Single battery and battery pack

Abstract

According to the battery, an insulating part is arranged on the first face, facing an electrode assembly, of a top cover piece, the insulating part comprises a first insulating part and a second insulating part which are arranged in a spaced mode in the first direction, and a gap is formed between the first insulating part and the second insulating part in the first direction; one end of the first insulating part adjacent to the second insulating part is provided with a first protruding part, one end of the second insulating part adjacent to the insulating part is provided with a second protruding part, and the first protruding part and the second protruding part are arranged at intervals along a third direction. The orthographic projection of the first protruding part on the plane where the first face is located is at least partially overlapped with the orthographic projection of the second protruding part on the plane where the first face is located, so that the gap between the first insulating part and the second insulating part is blocked through the matching design of the first protruding part and the second protruding part. Short circuit caused by contact between the tab piece in the tab and the top cover piece is avoided, and the use safety and the service life of the single battery are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to a single battery and a battery pack. Background Art

[0002] During the assembly process of existing single batteries, in order to ensure insulation between the top cover sheet and the tab in the electrode assembly, a lower insulating member is provided on the side of the top cover sheet facing the electrode assembly. When the insulating member includes two insulating parts, there is a gap between the two insulating parts, and there is a risk that the tab in the tab passes through the gap and is short-circuited with the top cover sheet, affecting the service life and use safety of the single battery. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a single battery and a battery pack to solve the problem that the tab in the current single battery contacts the top cover sheet and causes a short circuit.

[0004] A first aspect of an embodiment of the present application provides a single battery. The single battery has intersecting first and third directions. The single battery includes: a housing having an opening at one end along the third direction; an electrode assembly disposed in the housing, the electrode assembly including a main body portion and a tab connected to the main body portion; a top cover sheet covering the opening, a first side of the top cover sheet facing the electrode assembly; a terminal post partially passing through the top cover sheet and connected to the tab; an insulating member disposed on the first side, the insulating member including a first insulating part and a second insulating part spaced apart along the first direction, a gap being formed between the first insulating part and the second insulating part, a first protrusion being provided at an end of the first insulating part close to the second insulating part, a second protrusion being provided at an end of the second insulating part close to the first insulating part, at least a part of the first protrusion and at least a part of the second protrusion being located in the gap and spaced apart along the third direction; a positive projection of the first protrusion on a plane where the first side is located at least partially overlaps with a positive projection of the second protrusion on the plane where the first side is located.

[0005] Optionally, along the first direction, an end face of the first insulating part facing the second insulating part is a first end face, and an end face of the second insulating part facing the first insulating part is a second end face; the first protrusion is provided on the first end face and is connected to the second end face; and / or, the second protrusion is provided on the second end face and is connected to the first end face.

[0006] Optionally, along the first direction, the first protrusion has a first wall at an end facing away from the first end face, and a first gap is provided between the first wall and the second end face, or the first wall is connected to the second end face.

[0007] And / or, along the first direction, the second protruding portion has a second wall at an end departing from the second end face, and a second gap is provided between the second wall and the first end face, or the second wall is connected to the first end face.

[0008] Optionally, along the third direction, the length of the orthographic projection of the first wall on the first end face is H1 mm, satisfying: 0.1 mm ≤ H1 ≤ 5 mm; and / or, along the third direction, the length of the orthographic projection of the second wall on the second end face is H2 mm, satisfying: 0.1 mm ≤ H2 ≤ 5 mm.

[0009] Optionally, along the first direction, the length of the orthographic projection of the first protruding portion on the plane where the first face is located is L1 mm, satisfying: 0.1 mm ≤ L1 ≤ 10 mm; optionally, the length of the orthographic projection of the second protruding portion on the plane where the first face is located is L2 mm, satisfying: 0.1 mm ≤ L2 ≤ 10 mm.

[0010] Optionally, the single cell further has a second direction, and the first direction, the second direction, and the third direction intersect pairwise; along the second direction, the length of the orthographic projection of the first protruding portion on the plane where the first face is located is W1 mm, satisfying: 10 mm < W1 < 100 mm; and / or, the length of the orthographic projection of the second protruding portion on the plane where the first face is located is W2 mm, satisfying: 10 mm < W2 < 100 mm.

[0011] Optionally, the number of the first protruding portions is at least two, and they are arranged at intervals along the third direction; the number of the second protruding portions is at least two, and they are arranged at intervals along the third direction; at least two of the first protruding portions and at least two of the second protruding portions are arranged alternately along the third direction.

[0012] Optionally, the first protruding portion and the second protruding portion respectively extend along the first direction, and the first protruding portion and the second protruding portion are arranged in parallel.

[0013] A second aspect of the embodiments of the present application provides a battery pack, including the single cell as described above.

[0014] In summary, the embodiments of the present application provide a single battery and a battery pack having the single battery. By providing an insulating member on the first surface of the top cover sheet facing the electrode assembly, the insulating member includes a first insulating portion and a second insulating portion spaced apart along a first direction. A gap is formed between the first insulating portion and the second insulating portion along the first direction. A first protrusion is provided at one end of the first insulating portion adjacent to the second insulating portion, and a second protrusion is provided at one end of the second insulating portion adjacent to the first insulating portion. The first protrusion and the second protrusion are spaced apart along a third direction. The orthographic projection of the first protrusion on the plane where the first surface is located at least partially overlaps with the orthographic projection of the second protrusion on the plane where the first surface is located. Thus, through the cooperative design of the first protrusion and the second protrusion, the gap between the first insulating portion and the second insulating portion is blocked, avoiding the occurrence of short circuit caused by contact between the tab in the tab and the top cover sheet, ensuring the use safety and service life of the single battery, and ensuring the volume energy density of the single battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0016] Figure 1 is a schematic structural diagram of the single battery provided by the embodiments of the present application;

[0017] Figure 2 is Figure 1 an exploded view of;

[0018] Figure 3 is a schematic structural diagram of the composition of the top cover sheet, insulating member, pole column, and explosion-proof valve in the single battery provided by the embodiments of the present application;

[0019] Figure 4 is Figure 3 a bottom view of;

[0020] Figure 5 is Figure 4 an enlarged structural diagram of part A of;

[0021] Figure 6 is a schematic structural diagram of the first structure of the combination of the first insulating portion and the second insulating portion in the single battery provided by the embodiments of the present application;

[0022] Figure 7 is Figure 6 an enlarged structural diagram of part B of;

[0023] Figure 8It is the second structural schematic diagram of the combination of the first insulating part and the second insulating part in the single battery provided by the embodiment of the present application;

[0024] Figure 9 It is the third structural schematic diagram of the combination of the first insulating part and the second insulating part in the single battery provided by the embodiment of the present application;

[0025] Figure 10 Is Figure 9 The enlarged structural schematic diagram at position C of;

[0026] Figure 11 It is the fourth structural schematic diagram of the combination of the first insulating part and the second insulating part in the single battery provided by the embodiment of the present application;

[0027] Figure 12 Is Figure 11 The enlarged structural schematic diagram at position D of.

[0028] Main reference numeral description:

[0029] 1. Single battery;

[0030] 10. Housing, 11. Opening, 101. Accommodating cavity;

[0031] 20. Electrode assembly, 21. Main body part, 22. Tab;

[0032] 30. Top cover sheet, 31. First surface, 32. Second surface, 33. First through hole, 34. Second through hole, 35. Third through hole, 36. Fourth through hole;

[0033] 40. Terminal post, 41. Positive terminal post, 42. Negative terminal post;

[0034] 50. Insulating part, 51. First insulating part, 510. First end face, 511. First convex part, 512. First wall, 513. First gap, 514. First surface, 515. Third wall, 52. Second insulating part, 520. Second end face, 521. Second convex part, 522. Second wall, 523. Second gap, 524. Second surface, 525. Fourth wall, 53. Gap;

[0035] 60. Explosion-proof valve, 70. Sealing nail;

[0036] X. First direction, Y. Second direction, Z. Third direction. Detailed implementation manners

[0037] In order to make the purpose, technical solution and beneficial effects of the present application clearer and more understandable, the present application will be further described in detail below with reference to the drawings and specific implementation manners. It should be understood that the specific implementation manners described in this specification are only for explaining the present application and not for limiting the present application.

[0038] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "thickness", "upper", "lower", "vertical", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings. It is 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 should not be construed as a limitation to the present application. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, the meaning of "a plurality" refers to two or more, unless otherwise specifically defined.

[0039] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0040] In the present application, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is lower than that of the second feature.

[0041] In the embodiments of the application, "parallel" means the state where the angle formed by a straight line and a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°. In addition, "perpendicular" means the state where the angle formed by a straight line and a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distance or equal angle means the state where the tolerance range is -1% to 1%.

[0042] The embodiments of the present application provide a battery pack, including a single cell 1.

[0043] In some embodiments of the present application, a single cell 1 is provided. Refer toFigures 1 to 12 , the single cell 1 includes: a housing 10, an electrode assembly 20, a top cover plate 30, a terminal post 40, and an insulating member 50. The single cell 1 has a first direction X, a second direction Y, and a third direction Z that intersect pairwise. Specifically, as in Figure 1 and Figure 2 the embodiment shown, the single cell 1 is a square cell, and the first direction X, the second direction Y, and the third direction Z are pairwise orthogonal.

[0044] Referring to Figure 1 and Figure 2 , the housing 10 is a square housing. The first direction X is parallel to the length direction of the housing 10, the second direction Y is parallel to the width direction of the housing 10, and the third direction Z is parallel to the height direction of the housing 10. One end of the housing 10 along the third direction Z has an opening 11. Referring to Figure 2 , an accommodation cavity 101 is provided inside the housing 10, and the opening 11 communicates with the accommodation cavity 101.

[0045] Referring to Figure 2 , the electrode assembly 20 is disposed inside the housing 10. Specifically, the electrode assembly 20 is disposed in the accommodation cavity 101 of the housing 10. The electrode assembly 20 includes a main body portion 21 and a tab 22 connected to the main body portion 21. The main body portion 21 includes a positive electrode plate, a separator, and a negative electrode plate. The positive electrode plate, the separator, and the negative electrode plate are stacked to form a stacked electrode assembly, or the positive electrode plate, the separator, and the negative electrode plate are stacked and then wound to form a wound electrode assembly. The tab 22 includes a positive tab and a negative tab. The positive tab is connected to the wound or stacked positive electrode plate, and the negative tab is connected to the wound or stacked negative electrode plate. In other words, the positive tab is formed by cutting a portion of the positive electrode plate where no positive active material layer is coated, or the positive tab is welded to a portion of the positive electrode plate where no positive active material layer is coated. The negative tab is formed by cutting a portion of the negative electrode plate where no negative active material layer is coated, or the negative tab is welded to a portion of the negative electrode plate where no negative active material layer is coated. Among them, the positive tab includes a plurality of positive tab pieces, and the plurality of positive tab pieces are stacked along the thickness direction (i.e., the second direction Y) of the main body portion 21 to form the positive tab. The negative tab includes a plurality of negative tab pieces, and the plurality of negative tab pieces are stacked along the thickness direction (i.e., the second direction Y) of the main body portion 21 to form the negative tab.

[0046] Referring to Figure 1 and Figure 2 , the top cover plate 30 covers the opening 11 of the housing 10 to seal the accommodation cavity 101. Referring to Figure 3 , the top cover plate 30 includes a first surface 31 and a second surface 32 that are oppositely disposed along the third direction Z. The surface of the top cover plate 30 facing the electrode assembly 20 is the first surface 31. Referring to Figure 1, a first through hole 33, a second through hole 34, a third through hole 35, and a fourth through hole 36 are formed in the top cover sheet 30. The third through hole 35, the first through hole 33, the fourth through hole 36, and the second through hole 34 are arranged at intervals along the first direction X. The first through hole 33, the second through hole 34, the third through hole 35, and the fourth through hole 36 penetrate the top cover sheet 30 along the third direction Z respectively.

[0047] Referring to Figure 1 and Figure 2 , a pole column 40 is partially inserted into the top cover sheet 30, and the pole column 40 is connected to the pole ear 22. Specifically, the pole column 40 includes a positive pole column 41 and a negative pole column 42. The positive pole column 41 is inserted into the second through hole 34, and the positive pole column 41 extends along the third direction Z. One end of the positive pole column 41 in the third direction Z extends into the accommodation cavity 101 of the housing 10 and is electrically connected to the positive pole ear in the pole ear 22. The negative pole column 42 is inserted into the third through hole 35, and the negative pole column 42 extends along the third direction Z. One end of the negative pole column 42 in the third direction Z extends into the accommodation cavity 101 of the housing 10 and is electrically connected to the negative pole ear in the pole ear 22. The pole column 40 is in insulating contact with the top cover sheet 30.

[0048] Referring to Figure 3 , an insulating member 50 is disposed on the first surface 31 of the top cover sheet 30, that is, the insulating member 50 is disposed in the accommodation cavity 101 of the housing 10. Referring to Figures 3 to 12 , the insulating member 50 includes a first insulating portion 51 and a second insulating portion 52 that are arranged at intervals along the first direction X. Referring to Figure 3 , Figures 6 to 8 and Figures 10 to 12 , a gap 53 is formed between the first insulating portion 51 and the second insulating portion 52 along the first direction X. Referring to Figures 3 to 10 , a first protrusion 511 is provided at one end of the first insulating portion 51 close to the second insulating portion 52 along the first direction X, and a second protrusion 521 is provided at one end of the second insulating portion 52 close to the first insulating portion 51 along the first direction X. At least part of the first protrusion 511 and at least part of the second protrusion 521 are both located in the gap 53 and are arranged at intervals along the third direction Z. The orthographic projection of the first protrusion 511 on the plane where the first surface 31 is located at least partially overlaps with the orthographic projection of the second protrusion 521 on the plane where the first surface 31 is located.

[0049] During the assembly of the single cell, in order to ensure the insulation between the top cover sheet and the electrode assembly, a lower insulating member needs to be provided on the surface of the top cover sheet facing the electrode assembly. When the lower insulating member includes two insulating portions, there is a gap between the two insulating portions. During the assembly process, there is a risk that the pole ear passes through the gap between the two insulating portions and contacts the top cover sheet, resulting in a short circuit. Moreover, during the welding process, the particles generated by welding may fall into the interior of the housing through the gap between the two insulating portions, resulting in a short circuit, thereby affecting the service life and use safety of the single cell.

[0050] The single battery 1 provided in the embodiment of the present application is provided with an insulating member 50 on the first surface 31 of the top cover sheet 30 facing the electrode assembly 20. The insulating member 50 includes a first insulating portion 51 and a second insulating portion 52 spaced apart along the first direction X. A gap 53 is formed between the first insulating portion 51 and the second insulating portion 52. Along the first direction X, a first protrusion 511 is provided at one end of the first insulating portion 51 adjacent to the second insulating portion 52. A second protrusion 521 is provided at one end of the second insulating portion 52 adjacent to the first insulating portion 51. The first protrusion 511 and the second protrusion 521 are both provided in the gap 53 and spaced apart along the third direction Z. The orthographic projection of the first protrusion 511 on the plane where the first surface 31 is located is at least partially overlapped with the orthographic projection of the second protrusion 521 on the plane where the first surface 31 is located, so that the matching design of the first protrusion 511 and the second protrusion 521 can form a The gap 53 between the paired first insulating part 51 and the second insulating part 52 is blocked, and the first protrusion 511 and the second protrusion 521 cooperate to form a barrier to the pole ear 22 in the electrode assembly 20. During the assembly of the single battery 1, the pole ear 22 cannot pass through the gap 53 between the first insulating part 51 and the second insulating part 52, thereby avoiding the contact between the pole ear 22 and the top cover sheet 30 and causing a short circuit. Moreover, the cooperation design of the first protrusion 511 and the second protrusion 521 can form a barrier to metal particles or impurities generated by the welding process when the welding process is adopted during the assembly of the single battery 1, thereby avoiding the metal particles or impurities from falling into the accommodating cavity 101 of the shell 10 through the gap 53 between the first insulating part 51 and the second insulating part 52 and causing a short circuit, thereby ensuring the safety and service life of the battery cell, and ensuring the volume energy density of the single battery.

[0051] The orthographic projection of the first protrusion 511 on the plane where the first surface 31 is located and the orthographic projection of the second protrusion 521 on the plane where the first surface 31 is located are determined as follows:

[0052] Disassemble the single battery 1, remove the top cover sheet 30, the insulating member 50 arranged on the top cover sheet 30, and the pole 40 inserted on the top cover sheet 30 from the shell 10, and the first protrusion 511 on the first insulating portion 51 and the second protrusion 521 on the second insulating portion 52 can be observed. Along the third direction Z, a light source is arranged on the side of the insulating member 50 away from the top cover sheet 30 to illuminate the first insulating portion 51 and the second insulating portion 52, so as to obtain the orthographic projections of the first protrusion 511 and the second protrusion 521 on the first surface 31 of the top cover sheet 30.

[0053] In some embodiments, the top cover sheet 30 is a plain aluminum plate.

[0054] In some embodiments, the first insulating portion 51 and the second insulating portion 52 are both made of insulating plastic.

[0055] In some embodiments, reference Figure 5 and Figure 7 Along the first direction X, the end surface of the first insulating portion 51 facing one end of the second insulating portion 52 is a first end surface 510 , and the end surface of the second insulating portion 52 facing one end of the first insulating portion 51 is a second end surface 520 .

[0056] In some embodiments, a first protrusion 511 is provided on the first end surface 510, and the first protrusion 511 is connected to the second end surface 520, that is, the first protrusion 511 is protrudingly provided on the first end surface 510 along the first direction X, and one end of the first protrusion 511 away from the first end surface 510 in the first direction X is connected to the second end surface 520. The structural design of the connection between the first protrusion 511 and the second end surface 520 enables the first protrusion 511 to form a blockage for the gap 53 between the first insulating portion 51 and the second insulating portion 52, thereby avoiding the contact between the tab 22 and the top cover sheet 30 to cause a short circuit, and preventing impurities such as metal particles generated by welding from falling into the accommodating cavity 101 of the shell 10.

[0057] In some embodiments, a second protrusion 521 is provided on the second end surface 520, and the second protrusion 521 is connected to the first end surface 510, that is, the second protrusion 521 is protrudingly provided along the first direction X and connected to the second end surface 520, and one end of the second protrusion 521 away from the second end surface 520 in the first direction X is connected to the first end surface 510. The structural design of the connection between the second protrusion 521 and the first end surface 510 enables the second protrusion 521 to form a blockage for the gap 53 between the first insulating portion 51 and the second insulating portion 52, thereby preventing the tab 22 from contacting the top cover sheet 30 to cause a short circuit, and preventing impurities such as metal particles generated by welding from falling into the accommodating cavity 101 of the shell 10.

[0058] In some embodiments, reference Figures 3 to 7 The number of the first protrusion 511 is one, the number of the second protrusion 521 is one, the first protrusion 511 and the second protrusion 521 are spaced apart along the third direction Z, and the orthographic projection of the first protrusion 511 on the plane where the first surface 31 is located partially overlaps with the orthographic projection of the second protrusion 521 on the plane where the first surface 31 is located, thereby avoiding the short circuit caused by the contact between the pole ear 22 and the top cover sheet 30, and preventing impurities such as metal particles generated by welding from falling into the accommodating cavity 101.

[0059] In some embodiments, the number of the first protrusions 511 is at least two, which are spaced apart along the third direction Z, the number of the second protrusions 521 is two, which are spaced apart along the third direction Z, and at least two first protrusions 511 and at least two second protrusions 521 are arranged alternately along the third direction Z. Figure 9 andFigure 10 In the illustrated embodiment, the number of the first protruding portions 511 is two, which are arranged at intervals in the third direction Z. The number of the second protruding portions 521 is two, which are arranged at intervals in the third direction Z. The two first protruding portions 511 and the two second protruding portions 521 are arranged in a staggered manner in the third direction Z, so as to form a quadruple barrier to the gap 53 between the first insulating portion 51 and the second insulating portion 52 in the first direction X. Even if there is a first gap 513 between the first protruding portion 511 and the second end face 520, and / or there is a second gap 523 between the second protruding portion 521 and the first end face 510, it can still be ensured that the tab 22 cannot pass through all the first protruding portions 511 and the second protruding portions 521 to contact the top cover sheet 30, and a barrier to impurities such as metal particles generated during the welding process can be formed, preventing the metal particles and other impurities from falling into the accommodation cavity 101 of the housing 10 through the first gap 513 between the first protruding portion 511 and the second end face 520, and / or the second gap 523 between the second protruding portion 521 and the first end face 510 to contact the electrode assembly 20, thereby avoiding the occurrence of a short circuit and ensuring the use safety and stability of the single cell 1.

[0060] In some embodiments, referring to Figure 11 and Figure 12 , on the side of the second insulating portion 52 facing the first insulating portion 51 in the first direction X, a second protruding portion 521 is provided. The first insulating portion 51 is not provided with a first protruding portion 511 on the side facing the second insulating portion 52. The number of the second protruding portions 521 is at least one. One end of the second protruding portion 521 facing away from the second end face 520 in the first direction X is connected to the first end face 510, forming a blockage of the gap 53 between the first insulating portion 51 and the second insulating portion 52.

[0061] In some embodiments, on the side of the first insulating portion 51 facing the second insulating portion 52 in the first direction X, a first protruding portion 511 is provided. The second insulating portion 52 is not provided with a second protruding portion 521 on the side facing the first insulating portion 51. The number of the first protruding portions 511 is at least one. One side of the first protruding portion 511 facing away from the first end face 510 in the first direction X is connected to the second end face 520, forming a blockage of the gap 53 between the first insulating portion 51 and the second insulating portion 52.

[0062] In some embodiments, the number of the first protruding portions 511 is at least two, and the number of the second protruding portions 521 is at least one. In some embodiments, the number of the first protruding portions 511 is at least one, and the number of the second protruding portions 521 is at least two. The numbers of the first protruding portions 511 and the second protruding portions 521 can be selected according to actual use requirements, as long as it is ensured that the orthographic projection of the first protruding portion 511 on the plane where the first surface 31 is located and the orthographic projection of the second protruding portion 521 on the plane where the first surface 31 is located at least partially overlap.

[0063] In some embodiments, referring to Figure 7 , along the first direction X, the first protruding portion 511 has a first wall 512 at one end departing from the first end face 510, and a first gap 513 is provided between the first wall 512 and the second end face 520. The provision of the first gap 513 provides room for the first protruding portion 511 to move along the first direction X, such that when the monomer battery 1 shakes and causes relative movement between the first insulating portion 51 and the second insulating portion 52, the orthographic projection of the first protruding portion 511 on the plane where the first surface 31 is located and the orthographic projection of the second protruding portion 521 on the plane where the first surface 31 is located can at least partially overlap, ensuring that the tab 22 does not contact the top cover plate 30 and guaranteeing the use safety and stability of the monomer battery 1.

[0064] In some embodiments, referring to Figure 7 , along the first direction X, the second protruding portion 521 has a second wall 522 at one end departing from the second end face 520, and a second gap 523 is provided between the second wall 522 and the first end face 510. The provision of the second gap 523 provides room for the second protruding portion 521 to move along the first direction X, such that when the monomer battery 1 shakes and causes relative movement between the first insulating portion 51 and the second insulating portion 52, the orthographic projection of the first protruding portion 511 on the plane where the first surface 31 is located and the orthographic projection of the second protruding portion 521 on the plane where the first surface 31 is located can at least partially overlap, ensuring that the tab 22 does not contact the top cover plate 30 and guaranteeing the use safety and stability of the monomer battery 1.

[0065] In some embodiments, referring to Figures 6 to 10 , the first protruding portion 511 and the second protruding portion 521 extend along the first direction X respectively, and the first protruding portion 511 and the second protruding portion 521 are arranged in parallel, so that the orthographic projection of the first protruding portion 511 on the plane where the first surface 31 is located and the orthographic projection of the second protruding portion 521 on the plane where the first surface 31 is located can at least partially overlap, ensuring that the tab 22 does not contact the top cover plate 30 and guaranteeing the use safety and stability of the monomer battery 1.

[0066] In some embodiments, referring to Figure 5 and Figure 7, along the first direction X, the length of the positive projection of the first convex portion 511 on the plane where the first surface 31 is located is L1 mm, satisfying: 0.1 mm ≤ L1 ≤ 10 mm. Specifically, the value of L1 can be any value among 0.1 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm or any value within the range value composed of any two of these values. When the value of L1 is within the above range, the first convex portion 511 can have a sufficient length in the first direction X, so that the positive projection of the first convex portion 511 on the plane where the first surface 31 is located and the positive projection of the second convex portion 521 on the plane where the first surface 31 is located can at least partially overlap, and the volume energy density of the single battery 1 can be ensured, and the manufacturing cost of the single battery 1 can be reduced.

[0067] In some embodiments, referring to Figure 5 and Figure 7 , along the first direction X, the length of the positive projection of the second convex portion 521 on the plane where the first surface 31 is located is L2 mm, satisfying: 0.1 mm ≤ L2 ≤ 10 mm. Specifically, the value of L2 can be any value among 0.1 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm or any value within the range value composed of any two of these values. When the value of L2 is within the above range, the second convex portion 521 can have a sufficient length in the first direction X, so that the positive projection of the second convex portion 521 on the plane where the first surface 31 is located and the positive projection of the first convex portion 511 on the plane where the first surface 31 is located can at least partially overlap, and the volume energy density of the single battery 1 can be ensured, and the manufacturing cost of the single battery 1 can be reduced.

[0068] In some embodiments, referring to Figure 5, along the second direction Y, the length of the positive projection of the first protrusion 511 on the plane where the first surface 31 is located is W1 mm, satisfying: 10 mm < W1 < 100 mm. Specifically, the value of W1 can be any value among 11 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 99 mm or any value within the range value composed of any two of these values. When the value of W1 is within the above range, the first protrusion 511 has sufficient length in the second direction Y to match the size of the main body 21 in the electrode assembly 20 in the second direction Y (i.e., the size in the thickness direction of the main body 21), so that the first protrusion 511 can form a barrier to the multiple tab pieces arranged at intervals in the second direction Y in the electrode assembly 20, preventing the tab pieces from contacting the top cover piece 30 through the gap between the first insulating portion 51 and the second insulating portion 52, resulting in a short circuit, enabling the single cell 1 to have a suitable volumetric energy density and reducing the manufacturing cost of the single cell 1.

[0069] In some embodiments, referring to Figure 5 , along the second direction Y, the length of the positive projection of the second protrusion 521 on the plane where the first surface 31 is located is W2 mm, satisfying: 10 mm < W2 < 100 mm. Specifically, the value of W2 can be any value among 11 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 99 mm or any value within the range value composed of any two of these values. When the value of W2 is within the above range, the second protrusion 521 has sufficient length in the second direction Y to match the size of the main body 21 in the electrode assembly 20 in the second direction Y (i.e., the size in the thickness direction of the main body 21), so that the second protrusion 521 can form a barrier to the multiple tab pieces arranged at intervals in the second direction Y in the electrode assembly 20, preventing the tab pieces from contacting the top cover piece 30 through the gap between the first insulating portion 51 and the second insulating portion 52, resulting in a short circuit, enabling the single cell 1 to have a suitable volumetric energy density and reducing the manufacturing cost of the single cell 1.

[0070] In some embodiments, referring to Figure 7, along the first direction X, the first protrusion 511 has a first wall 512 at one end facing away from the first end face 510. The length of the orthographic projection of the first wall 512 on the first end face 510 is H1 mm, satisfying: 0.1 mm ≤ H1 ≤ 5 mm. Specifically, the value of H1 can be any value among 0.1 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm or any value within the range composed of any two of these values. When the value of H1 is within the above range, the first protrusion 511 can have sufficient thickness in the third direction Z, enabling the first protrusion 511 to have sufficient strength to ensure the blocking of the tab 22 by the first protrusion 511, avoiding the situation where the first protrusion 511 breaks under the pushing action of the tab 22, ensuring the use safety and stability of the single cell 1, and enabling the single cell 1 to have a suitable volumetric energy density and reducing the manufacturing cost of the single cell 1.

[0071] In some embodiments, referring to Figure 7 , along the first direction X, the second protrusion 521 has a second wall 522 at one end facing away from the second end face 520. The length of the orthographic projection of the second wall 522 on the second end face 520 is H2 mm, satisfying: 0.1 mm ≤ H2 ≤ 5 mm. Specifically, the value of H2 can be any value among 0.1 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm or any value within the range composed of any two of these values. When the value of H1 is within the above range, the second protrusion 521 can have sufficient thickness in the third direction Z, enabling the second protrusion 521 to have sufficient strength to ensure the blocking of the tab 22 by the second protrusion 521, avoiding the situation where the second protrusion 521 breaks under the pushing action of the tab 22, ensuring the use safety and stability of the single cell 1, and enabling the single cell 1 to have a suitable volumetric energy density and reducing the manufacturing cost of the single cell 1.

[0072] In some embodiments, referring to Figure 7, along the third direction Z, the first insulating part 51 has a first surface 514 disposed opposite to the first surface 31, that is, the first surface 514 is connected to the first surface 31 of the top cover sheet 30 along the third direction Z. The first convex part 511 has a third wall 515 disposed opposite to the first surface 31. The distance between the plane where the third wall 515 is located and the plane where the first surface 514 is located is S1 mm, satisfying: 0 mm ≤ S1 ≤ 10 mm. Specifically, the value of S1 can be any value among 0, 0.1 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm or any value within the range formed by any two of these values. When the value of S1 is within the above range, the first convex part 511 is disposed at the corresponding position on the first end face 510, so that the first convex part 511 and the second convex part 521 cooperate to form a seal for the gap 53 between the first insulating part 51 and the second insulating part 52, avoiding the pole ear 22 from contacting the top cover sheet 30.

[0073] In some embodiments, referring to Figure 7 , along the third direction Z, the second insulating part 52 has a second surface 524 disposed opposite to the first surface 31, that is, the second surface 524 is connected to the first surface 31 of the top cover sheet 30 along the third direction Z. The second convex part 521 has a fourth wall 525 disposed opposite to the first surface 31. The distance between the plane where the fourth wall 525 is located and the plane where the second surface 524 is located is S2 mm, satisfying: 0 mm ≤ S2 ≤ 10 mm. Specifically, the value of S2 can be any value among 0, 0.1 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm or any value within the range formed by any two of these values. When the value of S2 is within the above range, the second convex part 521 is disposed at the corresponding position on the second end face 520, so that the first convex part 511 and the second convex part 521 cooperate to form a seal for the gap 53 between the first insulating part 51 and the second insulating part 52, avoiding the pole ear 22 from contacting the top cover sheet 30.

[0074] In some embodiments, referring to Figure 2 , the size of the top cover sheet 30 in the first direction X is L3 mm, satisfying: 100 mm < L3 < 650 mm. Specifically, the value of L3 can be any value among 101 mm, 200 mm, 300 mm, 400 mm, 500 mm, 600 mm, 649 mm or any value within the range formed by any two of these values.

[0075] In some embodiments, the top cover sheet 30 has a dimension of L4 mm in the second direction Y, satisfying: 10 mm < L4 < 100 mm. Specifically, the value of L4 can be any value among 11 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, 80 mm, 90 mm, 99 mm or any value within the range formed by any two of these values. In some embodiments, 10 mm < L4 < 85 mm.

[0076] In some embodiments, referring to Figure 3 , the top cover sheet 30 has a dimension of L5 mm in the third direction Z, satisfying: 1 mm < L5 < 3 mm. Specifically, the value of L3 can be any value among 1.1 mm, 1.5 mm, 2 mm, 2.5 mm, 2.9 mm or any value within the range formed by any two of these values. In some embodiments, 1.4 mm < L5 < 2.6 mm.

[0077] In some embodiments, 0.0153 < L4 / L3 < 1.

[0078] When the dimensions L3, L4, L5 of the top cover sheet 30 and L4 / L3 are within the above ranges, the top cover sheet 30 can be adapted to a variety of different types of single cells 1.

[0079] The following further describes the present application in detail with specific embodiments, and these embodiments should not be construed as limiting the scope claimed by the present application.

[0080] Embodiment 1

[0081] Assembling the single cell 1:

[0082] The electrode assembly 20 is inserted into the housing 10. A first protrusion 511 is formed by machining on the first insulating portion 51. The first protrusion 511 and the first insulating portion 51 are integrally injection-molded. The length L1 of the positive projection of the first protrusion 511 on the plane where the first surface 31 is located in the first direction X is 0.1 mm. The length W1 of the positive projection of the first protrusion 511 on the plane where the first surface 31 is located in the second direction Y is 50 mm. The length H1 of the positive projection of the first wall 512 of the first protrusion 511 on the first end face 510 in the third direction Z is 1 mm.

[0083] A second protrusion 521 is machined and formed on the second insulating portion 52. The second protrusion 521 is integrally injection-molded with the second insulating portion 52. The length L2 of the orthographic projection of the second protrusion 521 on the plane where the first surface 31 is located in the first direction X is 1 mm, the length W2 of the orthographic projection of the second protrusion 521 on the plane where the first surface 31 is located in the second direction Y is 50 mm, and the length H2 of the orthographic projection of the second wall 522 of the second protrusion 521 on the second end face 520 in the third direction Z is 1 mm.

[0084] The first insulating portion 51 and the second insulating portion 52 are arranged at intervals in the first direction X on the first surface 31 of the top cover sheet 30 to form a top cover plate;

[0085] The positive electrode post 41 is inserted into the first through hole 33, and a sealing ring is arranged between the positive electrode post 41 and the second through hole 34 to insulate from the top cover sheet 30. The negative electrode post 42 is inserted into the third through hole 35, and a sealing ring is even arranged between the negative electrode post 42 and the third through hole 35 to insulate from the top cover sheet 30. After the assembly is completed, the positive electrode post 41 and the negative electrode post 42 are fixed by injection molding.

[0086] The explosion-proof valve 60 is arranged in the first through hole 33. The top cover plate is covered on the opening 11 of the housing 10. The positive electrode post 41 is welded and connected to the positive electrode tab among the tabs 22 of the electrode assembly 20, and the negative electrode post 42 is welded and connected to the negative electrode tab among the tabs 22 of the electrode assembly 20. The electrolyte is injected into the housing 10 through the fourth through hole 36. After the injection is completed, the fourth through hole 36 is sealed by the sealing nail 70, and the assembly of the single cell 1 is completed.

[0087] Examples 2 to 26

[0088] The single cell 1 is assembled by using the method provided in Example 1, and the rest is the same as Example 1 except for the following differences:

[0089] The processing technology of the first insulating portion 51 and the first protrusion 511 is adjusted, and the processing technology of the second insulating portion 52 and the second protrusion 521 is adjusted, so as to adjust the values of L1, L2, W1, W2, H1 and H2, specifically referring to Table 1.

[0090] Comparative Example 1

[0091] The single cell 1 is assembled by using the method provided in Example 1, and the rest is the same as Example 1 except for the following differences:

[0092] The first protrusion 511 is not machined and formed on the first insulating portion 51, and the second protrusion 521 is not machined and formed on the second insulating portion 52.

[0093] Dimension measurement method:

[0094] Provide the single cell 1 provided in Examples 1 to 26 and Comparative Example 1. Remove the top cover sheet 30, the terminal post 40, and the insulating member 50 from the opening 11 of the housing 10. Set a light source on the side of the insulating member 50 facing away from the top cover sheet 30 in the third direction Z to irradiate the insulating member 50, and obtain the orthographic projections of the first convex portion 511 and the second convex portion 521 on the first surface 31 of the top cover sheet 30. Use a vernier caliper to measure the dimensions of L1, L2, W1, and W2, and the measurement results are shown in Table 1.

[0095] Remove the first insulating portion 51 from the top cover sheet 30, and use a vernier caliper to measure the dimension of H1 of the first convex portion 511. The measurement results are shown in Table 1. Remove the second insulating portion 52 from the top cover sheet 30, and use a vernier caliper to measure the dimension of H2 of the second convex portion 521. The measurement results are shown in Table 1.

[0096] Test method for the insulation performance of the single cell 1:

[0097] Provide the single cell 1 provided in Examples 1 to 26 and Comparative Example 1. Turn the multimeter to the DC voltage range, place one pen tip on the negative terminal post 42 and the other pen tip on the housing 10, and record the test value. The test results are shown in Table 1.

[0098] Among them, when the voltage between the negative terminal post 42 and the housing 10 is ≤ 0.3V, it indicates that the negative tab in the tab 22 is in contact with the top cover sheet 30, and the single cell 1 is short-circuited.

[0099] Test method for the volume energy density:

[0100] Provide the single cell 1 provided in Examples 1 to 26 and Comparative Example 1. Place the single cell 1 in a constant temperature oven at 25 ± 3°C and let it stand for 30 minutes to make the single cell 1 reach a constant temperature. Charge the single cell 1 that has reached a constant temperature at a constant current of 0.5C until the voltage reaches 4.25V, and then charge it at a constant voltage of 4.25V until the current reaches 0.05C, and discharge it at 0.33C until the voltage reaches 2.8V, and record the discharge energy.

[0101] Volume energy density = energy released by the battery single cell 1 / volume of the single cell 1, and the test results are shown in Table 1.

[0102] Among them, the volume of the single cell 1 is the sum of the volumes of the housing 10, the electrode assembly 20, the top cover sheet 30, the terminal post 40, and the insulating member 50.

[0103] Table 1

[0104]

[0105]

[0106] As can be seen from Table 1, referring to Embodiments 1 to 4, when the values of L2, W1, W2, H1, and H2 remain unchanged, as the value of L1 increases, the volumetric energy density of the single cell 1 shows a downward trend. This is because an increase in the value of L1 will lead to an increase in the volume of the first protrusion 511, which in turn leads to an increase in the overall volume and weight of the single cell 1, and thus the volumetric energy density of the single cell 1 shows a downward trend. At the same time, although the value of L1 increases, it still remains within the range of 0.1 mm ≤ L1 ≤ 10 mm defined in this application. Therefore, the first protrusion 511 can cooperate with the second protrusion 521 to block the gap 53 between the first insulating part 51 and the second insulating part 52, preventing the pole ear 22 from contacting the top cover sheet 30. Thus, the voltage between the negative electrode post 42 and the housing 10 in the single cells 1 provided in Embodiments 1 to 4 is higher than 0.3 V, and no short - circuit occurs.

[0107] Referring to Embodiments 5 to 8, when the values of L1, W1, W2, H1, and H2 remain unchanged, as the value of L2 increases, the volumetric energy density of the single cell 1 shows a downward trend. This is because an increase in the value of L2 will lead to an increase in the volume of the second protrusion 521, which in turn leads to an increase in the overall volume and weight of the single cell 1, and thus the volumetric energy density of the single cell 1 shows a downward trend. At the same time, although the value of L2 increases, it still remains within the range of 0.1 mm ≤ L2 ≤ 10 mm defined in this application. Therefore, the second protrusion 521 can cooperate with the first protrusion 511 to block the gap 53 between the first insulating part 51 and the second insulating part 52, preventing the pole ear 22 from contacting the top cover sheet 30. Thus, the voltage between the negative electrode post 42 and the housing 10 in the single cells 1 provided in Embodiments 5 to 8 is higher than 0.3 V, and no short - circuit occurs.

[0108] Referring to Embodiments 9 to 12, when the values of L1, L2, W2, H1, and H2 remain unchanged, as the value of W1 increases, the volumetric energy density of the single cell 1 shows a downward trend. This is because an increase in the value of W1 will lead to an increase in the volume of the first protrusion 511, which in turn leads to an increase in the overall volume and weight of the single cell 1, and thus the volumetric energy density of the single cell 1 shows a downward trend. At the same time, although the value of W1 increases, it still remains within the range of 10 mm < W1 < 100 mm defined in this application, enabling the first protrusion 511 to cooperate with the second protrusion 521 to form a barrier to multiple stacked pole ear sheets in the second direction Y, preventing the pole ear sheets from contacting the top cover sheet 30 and causing a short - circuit, and further preventing the pole ear 22 from contacting the top cover sheet 30. Thus, the voltage between the negative electrode post 42 and the housing 10 in the single cells 1 provided in Embodiments 9 to 12 is higher than 0.3 V, and no short - circuit occurs.

[0109] Referring to Embodiments 13 to 16, when the values of L1, L2, W1, H1, and H2 remain unchanged, as the value of W2 increases, the volumetric energy density of the single cell 1 shows a downward trend. This is because an increase in the value of W2 leads to an increase in the volume of the second protrusion 521, which in turn causes an increase in the overall volume and weight of the single cell 1, and thus the volumetric energy density of the single cell 1 shows a downward trend. At the same time, although the value of W2 increases, it still remains within the range of 10 mm < W2 < 100 mm defined in this application, enabling the second protrusion 521 to cooperate with the first protrusion 511 to form a barrier to multiple stacked tab pieces in the second direction Y, preventing the tab pieces from contacting the top cover sheet 30 and causing a short circuit, and further avoiding the situation where the tab 22 contacts the top cover sheet 30. Therefore, the voltage between the negative electrode post 42 and the housing 10 in the single cell 1 provided in Embodiments 13 to 16 is higher than 0.3 V, and no short circuit occurs.

[0110] Referring to Embodiments 17 to 20, when the values of L1, L2, W1, W2, and H2 remain unchanged, as the value of H1 increases, the volumetric energy density of the single cell 1 shows a downward trend. This is because an increase in the value of H1 leads to an increase in the volume of the first protrusion 511, which in turn causes an increase in the overall volume and weight of the single cell 1, and thus the volumetric energy density of the single cell 1 shows a downward trend. At the same time, although the value of H1 increases, it still remains within the range of 0.1 mm ≤ H1 ≤ 5 mm defined in this application, enabling the first protrusion 511 to have sufficient thickness and strength to block the tab 22, and the first protrusion 511 will not break under the pushing action of the tab pieces in the tab 22, thereby preventing the situation where the tab 22 passes through the gap 53 between the first insulating portion 51 and the second insulating portion 52 and contacts the top cover sheet 30. Therefore, the voltage between the negative electrode post 42 and the housing 10 in the single cell 1 provided in Embodiments 17 to 20 is higher than 0.3 V, and no short circuit occurs.

[0111] Referring to Embodiments 21 to 24, when the values of L1, L2, W1, W2, and H1 remain unchanged, as the value of H2 increases, the volumetric energy density of the single cell 1 shows a downward trend. This is because the increase in the value of H2 leads to an increase in the volume of the second protrusion 521, which in turn causes an increase in the overall volume and weight of the single cell 1, resulting in a downward trend in the volumetric energy density of the single cell 1. At the same time, although the value of H2 increases, it still remains within the range of 0.1 mm ≤ H2 ≤ 5 mm defined in this application, enabling the second protrusion 521 to have sufficient thickness and strength to block the tab 22, and the second protrusion 521 will not break under the pushing action of the tab piece in the tab 22, thus preventing the tab 22 from contacting the top cover sheet 30 through the gap 53 between the first insulating portion 51 and the second insulating portion 52. Therefore, the voltage between the negative electrode post 42 and the housing 10 in the single cell 1 provided in Embodiments 21 to 24 is higher than 0.3 V, and no short - circuit occurs.

[0112] Referring to Embodiment 25, in the single cell 1 provided in Embodiment 25, the value of L1 is lower than the lower limit defined by 0.1 mm ≤ L1 ≤ 10 mm, only being 0.05 mm, and the value of L2 is lower than the lower limit defined by 0.1 mm ≤ L2 ≤ 10 mm, only being 0.05 mm. As a result, the orthographic projection of the first protrusion 511 on the plane where the first surface 31 is located does not overlap with the orthographic projection of the second protrusion 521 on the plane where the first surface 31 is located. That is, there is a gap between the first protrusion 511 and the second protrusion 521 in the first direction X, such that there is a risk that the tab piece in the tab 22 contacts the top cover sheet 30 through the gap 53. As a result, the voltage between the negative electrode post 42 and the housing 10 in the single cell 1 provided in Embodiment 25 is only 0.28 V, lower than 0.3 V, indicating that the tab 22 contacts the top cover sheet 30 and causes a short - circuit. However, due to the relatively low values of both L1 and L2, the overall volume and overall weight of the single cell 1 are lower than those in Embodiments 1 to 24, making the volumetric energy density of the single cell 1 higher than that in Embodiments 1 to 24.

[0113] In addition, in the single cell 1 provided in Example 25, the value of W1 is lower than the lower limit defined by 10 mm < W1 < 100 mm, only 5 mm, and the value of W2 is lower than the lower limit defined by 10 mm < W2 < 100 mm, only 5 mm, resulting in a shorter length of the first protrusion 511 and the second protrusion 521 in the second direction Y. When the number of tab pieces in the tab 22 of the electrode assembly 20 stacked in the second direction Y (i.e., the thickness direction of the main body 21) is relatively large, the first protrusion 511 and the second protrusion 521 can only block part of the tab pieces, resulting in a risk that the tab pieces at both ends in the second direction Y come into contact with the top cover piece 30 and are short-circuited. Therefore, the voltage between the negative electrode post 42 and the housing 10 in the single cell 1 provided in Example 25 is only 0.28 V, lower than 0.3 V, indicating that the tab 22 comes into contact with the top cover piece 30 and is short-circuited. However, due to the relatively low values of both W1 and W2, the overall volume and overall weight of the single cell 1 are lower than those of Examples 1 to 24, making the volume energy density of the single cell 1 higher than that of Examples 1 to 24.

[0114] In addition, in the single cell 1 provided in Example 25, the value of H1 is lower than the lower limit defined by 0.1 mm ≤ H1 ≤ 5 mm, only 0.05 mm, and the value of H2 is lower than the lower limit defined by 0.1 mm ≤ H2 ≤ 5 mm, only 0.05 mm, resulting in a relatively thin thickness of the first protrusion 511 and the second protrusion 521 in the third direction Z, making the strength of the first protrusion 511 and the second protrusion 521 relatively low. As a result, the first protrusion 511 and the second protrusion 521 are prone to break under the pushing action of the tab pieces in the tab 22, leading to the situation where the tab pieces in the tab 22 come into contact with the top cover piece 30. Therefore, the voltage between the negative electrode post 42 and the housing 10 in the single cell 1 provided in Example 25 is only 0.28 V, lower than 0.3 V, indicating that the tab 22 comes into contact with the top cover piece 30 and is short-circuited. However, due to the relatively low values of both H1 and H2, the overall volume and overall weight of the single cell 1 are lower than those of Examples 1 to 24, making the volume energy density of the single cell 1 provided in Example 25 higher than that of Examples 1 to 24.

[0115] Referring to Embodiment 26, for the single cell 1 provided in Embodiment 26, the values of L1, L2, W1, W2, H1, and H2 are all higher than the upper limit values, resulting in the excessive volume and weight of the first convex portion 511 and the second convex portion 521, leading to an increase in the overall volume and weight of the single cell 1. Furthermore, the volume energy density of the single cell 1 provided in Embodiment 26 is significantly lower than that of the single cells 1 provided in Embodiments 1 to 25. Since the values of L1, L2, W1, W2, H1, and H2 are all higher than the upper limit values, the first convex portion 511 and the second convex portion 521 can cooperate to form a strong block for the tab in the tab 22, and the tab in the tab 22 cannot contact the top cover sheet 30. As a result, the voltage between the negative electrode post 42 and the housing 10 in the single cell 1 provided in Embodiment 26 is higher than 0.3V, and no short - circuit occurs.

[0116] On the contrary, in Comparative Example 1, for the single cell 1 provided in Comparative Example 1, the first convex portion 511 is not provided on the first insulating portion 51, and the second convex portion 521 is not provided on the second insulating portion 52, resulting in a risk of short - circuit caused by the tab in the tab 22 contacting the top cover sheet 30 through the gap 53 between the first insulating portion 51 and the second insulating portion 52. Therefore, the voltage between the negative electrode post 42 and the housing 10 in the single cell 1 provided in Comparative Example 1 is only 0.25V, lower than 0.3V, indicating that the tab 22 contacts the top cover sheet 30 and causes a short - circuit. At the same time, due to the absence of the first convex portion 511 and the second convex portion 521, the volume and weight of the first insulating portion 51 and the second insulating portion 52 are correspondingly reduced, and the overall volume and overall weight of the single cell 1 are lower than those in Embodiments 1 to 26. As a result, the volume energy density of the single cell 1 provided in Comparative Example 1 is higher than that in Embodiments 1 to 26.

[0117] The technical solutions provided in the embodiments of the present application have been introduced in detail above. Specific examples are used in this article to elaborate on the principles and implementation manners of the present application. The descriptions of the above embodiments are only used to help understand the method and its core idea of the present application; at the same time, for those skilled in the art, according to the idea of the present application, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A single cell battery, wherein the single cell battery has a first direction (X) and a third direction (Z) intersecting each other, characterized in that: The single cell battery comprises: The housing (10) has an opening (11) at one end portion along the third direction (Z); An electrode assembly (20), the electrode assembly (20) being arranged in the housing (10), the electrode assembly (20) comprising a main body (21) and a tab (22) connected to the main body (21); A top cover sheet (30) covers the opening (11), wherein a side of the top cover sheet (30) facing the electrode assembly (20) is a first side (31); A pole (40) is partially inserted through the top cover sheet (30), and the pole (40) is connected to the pole lug (22); An insulating member (50) is arranged on the first surface (31), the insulating member (50) comprising a first insulating portion (51) and a second insulating portion (52) arranged at intervals along the first direction (X), a gap (53) being formed between the first insulating portion (51) and the second insulating portion (52), a first protruding portion (511) being provided at one end of the first insulating portion (51) close to the second insulating portion (52), and a second protruding portion (521) being provided at one end of the second insulating portion (52) close to the first insulating portion (51), at least part of the first protruding portion (511) and at least part of the second protruding portion (521) are both located in the gap (53) and are arranged at intervals along the third direction (Z); an orthographic projection of the first protruding portion (511) on the plane where the first surface (31) is located at least partially overlaps with an orthographic projection of the second protruding portion (521) on the plane where the first surface (31) is located.

2. The single cell according to claim 1, characterized in that: Along the first direction (X), an end surface of the first insulating portion (51) facing one end of the second insulating portion (52) is a first end surface (510), and an end surface of the second insulating portion (52) facing one end of the first insulating portion (51) is a second end surface (520); The first end surface (510) is provided with the first protruding portion (511), and the first protruding portion (511) is connected to the second end surface (520); And / or, the second end surface (520) is provided with the second protruding portion (521), and the second protruding portion (521) is connected to the first end surface (510).

3. The single cell according to claim 2, characterized in that: Along the first direction (X), the first protrusion (511) has a first wall (512) at one end away from the first end surface (510), and a first gap (513) is provided between the first wall (512) and the second end surface (520), or the first wall (512) is connected to the second end surface (520); And / or, along the first direction (X), the second protrusion (521) has a second wall (522) at one end facing away from the second end surface (520), and a second gap (523) is provided between the second wall (522) and the first end surface (510), or the second wall (522) is connected to the first end surface (510).

4. The single cell according to claim 3, characterized in that: Along the third direction (Z), the length of the orthographic projection of the first wall (512) on the first end surface (510) is H1 mm, satisfying: 0.1 mm ≤ H1 ≤ 5 mm; And / or, along the third direction (Z), the length of the orthographic projection of the second wall (522) on the second end surface (520) is H2 mm, satisfying: 0.1 mm ≤ H2 ≤ 5 mm.

5. The single cell according to claim 1, characterized in that: Along the first direction (X), the length of the orthographic projection of the first protrusion (511) on the plane where the first surface (31) is located is L1 mm, satisfying: 0.1 mm ≤ L1 ≤ 10 mm.

6. The single cell according to claim 1, characterized in that: Along the first direction (X), the length of the orthographic projection of the second protrusion (521) on the plane where the first surface (31) is located is L2 mm, satisfying: 0.1 mm ≤ L2 ≤ 10 mm.

7. The single cell according to claim 1, characterized in that: The single cell further has a second direction (Y), and the first direction (X), the second direction (Y) and the third direction (Z) intersect each other; Along the second direction (Y), the length of the orthographic projection of the first protrusion (511) on the plane where the first surface (31) is located is W1 mm, satisfying: 10 mm < W1 < 100 mm; And / or, the length of the orthographic projection of the second protrusion (521) on the plane where the first surface (31) is located is W2 mm, satisfying: 10 mm<W2<100 mm.

8. The single cell according to claim 1, characterized in that: The number of the first protrusions (511) is at least two, and they are arranged at intervals along the third direction (Z); The number of the second protrusions (521) is at least two, and they are arranged at intervals along the third direction (Z); At least two of the first protrusions (511) and at least two of the second protrusions (521) are arranged alternately along the third direction (Z).

9. The single cell according to claim 1, characterized in that: The first protruding portion (511) and the second protruding portion (521) extend respectively along the first direction (X), and the first protruding portion (511) and the second protruding portion (521) are arranged in parallel.

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

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