Battery monomer and electric equipment

Abstract

The invention belongs to the technical field of batteries, and particularly relates to a battery monomer and electric equipment. In the single battery, a battery cell comprises a battery cell main body and a tab, and the tab is led out from the main end surface of the battery cell main body; the top cover assembly comprises a cover plate and an insulating part, and the connecting position where a base plate of the insulating part is connected with a turnover plate in a turnover mode is a turnover point. The bending part of the tab is opposite to the overturning point; the insulating film coats the battery cell; the first end surface part of the insulating film is arranged between the cover plate and the main end surface of the battery cell main body; the first end surface part is provided with a first connecting end far away from the bent part and is connected with the first main surface part of the insulating film; an opening structure is arranged at the position, corresponding to the overturning point, of the first main surface part for the overturning plate to pass through; at least a portion of a side surface portion of the insulating film covers the opening structure. According to the invention, full cladding of the battery cell can be realized, and the problems that the top cover is difficult to enter the shell and the superior product rate is relatively low in the prior art can be improved, so that the stress condition of the tabs is improved, the upwarp of the tab-free side of the cover plate is inhibited, and the battery performance is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of batteries, and in particular relates to a battery cell and an electrical device. Background Art

[0002] With the rapid development of new energy technologies, batteries are being used more and more widely. In the battery production process, it is usually necessary to coat the battery cell with an insulating film, such as a Mylar film. However, for a single-coil battery, only one side is provided with a bent pole ear after entering the shell, and the other side is suspended. At present, a top cover assembly with a flip wing plate is usually used, and the flip wing plate is used to cooperate with the pole ear to improve the force. However, since the top diaphragm adapted to the top cover assembly in the existing Mylar membrane structure is assembled between the lower plastic structure and the battery cell, but the flip wing plate occupies the position opposite the pole ear, the Mylar membrane structure blocks the flipping trajectory of the flip wing plate during the assembly process, and the two interfere with each other, affecting the normal assembly operation. Summary of the invention

[0003] In view of this, in order to improve at least one of the above problems existing in the prior art, the present invention provides a battery cell and an electrical device.

[0004] The first aspect of the present invention provides a battery cell in the technical solution, including: a battery cell, the battery cell includes a battery cell body and a pole ear, the pole ear is led out from the main end face of the battery cell body, and the pole ear includes a bending portion; a top cover assembly, the top cover assembly includes a cover plate and an insulating member, the insulating member includes a substrate and a flip plate, the substrate and the flip plate are flippably connected, and the flippable connection between the substrate and the flip plate is the flip point; in a first direction, the bending portion and the flip point are arranged opposite to each other, and the first direction is the thickness direction of the battery cell; an insulating film, the insulating film covers the battery cell; the insulating film includes a first end face portion, a first main face portion and a side face portion, the first end face portion is arranged between the cover plate and the main end face of the battery cell body; the first end face portion has a first connecting end arranged away from the bending portion in the first direction; the first connecting end is connected to the first main face portion; an opening structure is arranged at the position of the first main face portion corresponding to the flip point, and the opening structure is configured to allow the flip plate to pass through when the substrate and the flip plate are flipped relative to each other; at least part of the side face portion covers the opening structure.

[0005] In a feasible implementation, the insulating film also includes a second main surface portion, which is connected to an end of the first end surface portion in the first direction away from the first main surface portion; at least one end of the second main surface portion in the second direction is connected to a side surface portion, the side surface portion has a first side portion, the first side portion covers the opening structure, and the first side portion and the insulating member are detachably connected; wherein the second direction is the length direction of the battery cell.

[0006] In a feasible implementation manner, the substrate has a first convex structure, and the flipping plate has a second convex structure that is flip-connectable to the first convex structure; the flipping point is the flip-connectable joint between the first convex structure and the second convex structure; the second convex structure is disposed opposite to the first convex structure in a third direction, and the third direction is the height direction of the battery cell; a clamping hole is provided at a position corresponding to the flipping point on the first side portion, and the first convex structure and the second convex structure are together clamped into the corresponding clamping hole to connect the first side portion and the insulating member.

[0007] In a feasible implementation manner, in the third direction, a first clamping groove is provided on a side of the first convex structure away from the second convex structure, and a second clamping groove is provided on a side of the second convex structure away from the first convex structure. Both the first clamping groove and the second clamping groove are clamped with the edge portion surrounding the clamping hole.

[0008] In a feasible implementation manner, the first convex structure has a first inclined surface portion disposed away from the second convex structure in the third direction; the first inclined surface portion is located between the first clamping groove and the flipping point; in the third direction, the distance between one end of the first inclined surface portion close to the first clamping groove and the cover plate is less than the distance between the other end of the first inclined surface portion away from the first clamping groove and the cover plate; the second convex structure has a second inclined surface portion disposed away from the first convex structure in the third direction; the second inclined surface portion is located between the second clamping groove and the flipping point; in the third direction, the distance between one end of the second inclined surface portion close to the second clamping groove and the cover plate is greater than the distance between the other end of the second inclined surface portion away from the second clamping groove and the cover plate.

[0009] In a feasible implementation manner, side portions are connected to both ends of the second main surface portion in the second direction, and each side portion has a first side portion; the size of the first side portion in the third direction is b, the size of the substrate in the first direction is W, and (0.5×W) < b < (1.5×W); the size of the first side portion in the second direction is a, the size of the substrate in the second direction is L, and (0.2×L) < a < (0.7×L).

[0010] In a feasible implementation manner, the tab further includes an electrical connection portion, and the electrical connection portion is connected to an end of the bent portion away from the battery cell body; the electrical connection portion is located between the flipping plate and the substrate; the flipping plate is in contact with the main end surface of the battery cell body.

[0011] In a feasible implementation manner, two tabs with opposite polarities are led out from the main end surface of the battery cell body; the flipping plates and the tabs are in a one-to-one correspondence relationship, and the flipping plates and the opening structures are in a one-to-one correspondence relationship.

[0012] In a feasible implementation manner, two tabs with opposite polarities are led out from the main end surface of the battery cell body; among them, the flipping plates and the tabs are in a one-to-one correspondence relationship, and the opening structure is configured to allow two flipping plates to flip through.

[0013] Alternatively, the two electrical connection portions are both located between the flip plate and the substrate, and the flip plate and the opening structure are in a one-to-one correspondence.

[0014] The technical solution of the second aspect of the present invention provides an electrical device, comprising a battery cell according to any one of the above-mentioned first aspect.

[0015] The beneficial effects of the above technical solution of the present invention are embodied in:

[0016] By improving the structure of the insulating film and setting an opening structure on the first main surface to reserve space for the flipping operation of the flip plate, after the flip plate is flipped, the side surface is used to cover the opening structure to form a coating on the battery cell body, which can meet the coating requirements of the insulating film and the flipping requirements of the flip plate at the same time, so that the insulating film can be used in the battery cell in combination with the top cover assembly with the flip plate, thereby improving the problems of the prior art that the top cover assembly is difficult to insert into the shell and the high quality rate is low, and can also improve the stress condition of the pole ear, suppress the warping of the side of the cover plate without the pole ear, which is beneficial to improving battery performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Shown is a three-dimensional schematic diagram of a battery cell provided by an embodiment of the present invention.

[0018] Figure 2 Shown is a cross-sectional view of a battery cell provided by an embodiment of the present invention (the cross-sectional plane is parallel to the first direction).

[0019] Figure 3 Shown is a schematic diagram of an expanded state of an insulating film provided by an embodiment of the present invention.

[0020] Figure 4 Shown Figure 2 Magnified view of part A in FIG.

[0021] Figure 5 Shown is a schematic diagram of an insulating member provided by an embodiment of the present invention.

[0022] Figure 6 FIG. 1 is a schematic diagram of a battery cell during assembly provided by an embodiment of the present invention (the flip plate is not flipped).

[0023] Figure 7 It is a schematic diagram of a battery cell during assembly provided by one embodiment of the present invention (the flip plate has been flipped through the opening structure).

[0024] Figure 8 Shown is a front view of a battery cell provided by an embodiment of the present invention.

[0025] Fig. 9 FIG. 4 is a schematic diagram of another insulating film provided by an embodiment of the present invention.

[0026] Fig.10 FIG. 4 is a schematic diagram of another insulating film provided by an embodiment of the present invention.

[0027] Fig.11 FIG. 1 is a schematic diagram of another battery cell during assembly provided by an embodiment of the present invention (the flip plate has been flipped through the opening structure).

[0028] Fig.12 Shown is a schematic diagram of yet another insulating member provided by an embodiment of the present invention.

[0029] Fig.13 FIG. 1 is a schematic diagram of another battery cell during assembly provided by an embodiment of the present invention (the flip plate has been flipped through the opening structure).

[0030] Fig.14 FIG. 4 is a schematic diagram of another insulating film provided by an embodiment of the present invention.

[0031] Fig.15 FIG. 1 is a schematic diagram of another battery cell during assembly provided by an embodiment of the present invention (the flip plate is not flipped).

[0032] Fig.16 Shown is a cross-sectional view of yet another battery cell provided by an embodiment of the present invention (the cross-sectional plane is parallel to the first direction).

[0033] Description of reference numerals:

[0034] 1 insulating film; 11 first main surface, 111 opening structure, 12 second main surface; 13 first end surface, 131 first connection end, 132 positioning hole, 14 side surface, 141 first side, 1411 clamping hole, 142 second side, 15 auxiliary portion;

[0035] 2 battery cell, 21 battery cell body, 211 main end surface, 22 pole ear, 221 lead-out portion, 222 bending portion, 223 electrical connection portion;

[0036] 3 insulating member, 31 substrate, 311 first protruding structure, 3111 first slot, 3112 first inclined portion, 312 first buckling portion; 32 flip plate, 321 second protruding structure, 3211 second slot, 3212 second inclined portion, 322 second buckling portion, 33 flip point;

[0037] 4 Cover plate; 5 Connecting piece. DETAILED DESCRIPTION

[0038] In the description of the application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise clearly and specifically limited. In the embodiment of the present application, all directional indications (such as up, down, left, right, front, back, top, bottom ...) are only used to explain the relative position relationship, motion conditions, etc. between the components under a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indication also changes accordingly. In addition, the terms "including" and "having" and any of their deformations are intended to cover non-exclusive inclusions. For example, the process, method, system, product or equipment comprising a series of steps or units are not limited to the steps or units listed, but optionally also include the steps or units not listed, or optionally also include other steps or units inherent to these processes, methods, products or equipment.

[0039] In addition, the reference to "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] Some embodiments of the battery cells and electrical equipment in the technical solution of the present invention are provided below.

[0042] Embodiment 1

[0043] In an embodiment of the first aspect of the present invention, a battery cell is provided, such as Figure 1 and Figure 2As shown, the battery cell includes a battery cell 2, a top cover assembly and an insulating film 1. The battery cell 2 includes a battery cell body 21 and a pole ear 22; the battery cell body 21 has a main end face 211, and the pole ear 22 is led out from the main end face 211 of the battery cell body 21 and is bent relative to the battery cell body 21, that is, the pole ear 22 includes a bending portion 222. The top cover assembly includes a cover plate 4 and an insulating member 3; the cover plate 4 is arranged corresponding to the main end face 211 of the battery cell body 21; the insulating member 3 includes a substrate 31 and a flip plate 32 that can be flipped, and the flip connection between the substrate 31 and the flip plate 32 is a flip point 33; wherein, the thickness direction of the battery cell 2 is a first direction, and in the first direction, the bending portion 222 of the pole ear 22 is arranged opposite to the flip point 33. The insulating film 1 covers the battery cell 2 to insulate the battery cell 2; the insulating film 1 includes a first end surface portion 13, a first main surface portion 11 and a side surface portion 14; the first end surface portion 13 is arranged between the cover plate 4 and the main end surface 211 of the battery cell body 21, and in the first direction, the first end surface portion 13 is provided with a first connecting end 131 at one end of the bending portion 222 away from the pole ear 22, and the first connecting end 131 is connected to the first main surface portion 11; an opening structure 111 is provided at a position corresponding to the turning point 33 on the first main surface portion 11, such as Figure 3 In the example in FIG. 1 , during the assembly operation, the opening structure 111 can allow the flip plate 32 to pass through when the base plate 31 and the flip plate 32 are flipped relative to each other, so as to reserve a flip channel for the flip plate 32; after the flip operation is completed, the flip plate 32 is located on the side of the first end surface 13 facing the battery body 21 to support the tab 22. After the assembly is completed, at least part of the side surface 14 covers the opening structure 111, so that the opening structure 111 is in a closed state, so as to completely cover the battery body 21.

[0044] It can be understood that in the prior art, the insulating film used to cover the battery cell is usually directly covered on the outside of the battery cell. However, for the top cover assembly with a flip plate, since the flip plate needs to be flipped during the assembly process so that the flip plate is located on the inside of the insulating film, the existing insulating film will block the flip plate after the coating is completed, and it is difficult to use with the top cover assembly with a flip plate.

[0045] In the battery cell in this embodiment, the structure of the insulating film 1 is improved, and an opening structure 111 is set on the first main surface 11 to reserve space for the flipping operation of the flip plate 32. After the flip plate 32 is flipped, the side surface 14 is used to cover the opening structure 111 to form a coating on the battery cell body 21, which can simultaneously meet the coating requirements of the insulating film 1 and the flipping requirements of the flip plate 32, so that the insulating film 1 can be used in the battery cell in combination with the top cover assembly with the flip plate 32, thereby improving the problems of difficulty in inserting the top cover assembly into the shell and low quality rate in the prior art, and can also improve the stress condition of the pole ear 22, and suppress the warping of the side of the cover plate 4 without the pole ear 22, which is beneficial to improving battery performance.

[0046] It should be noted that the number of tabs 22 can be set according to specific assembly requirements. For example, two tabs 22 with opposite polarities can be provided to connect the positive pole and the negative pole of the battery respectively. In addition, the insulating film can be a Mylar film; after the side surface portion 14 covers the opening structure 111, it can be fixed by adhesive strips, or a corresponding fixing structure can be provided as needed to fix the side surface portion 14.

[0047] It should also be noted that in the first direction, the bending portion 222 of the pole ear 22 is arranged opposite to the flip point 33. It can be understood that the bending portion 222 of the pole ear 22 and the flip point 22 are arranged opposite to each other along the first direction, or it can be understood that the bending portion 222 of the pole ear 22 and the flip point 22 are arranged opposite to each other along the first direction and staggered along the second direction.

[0048] In a further embodiment of the present invention, Figure 2 and Figure 3 As shown, the insulating film 1 further includes a second main surface 12 arranged opposite to the first main surface 11. In the first direction, the second main surface 12 and an end of the first end surface 13 away from the first main surface 11 are connected to each other, so that the first main surface 11 and the second main surface 12 respectively cover two large surfaces opposite to the battery body 21. The length direction of the battery cell 2 is the second direction, and at least one end of the second main surface 12 in the second direction is connected to a side surface 14, wherein the side surface 14 has a first side surface 141; after assembly is completed, the first side surface 141 covers the opening structure 111, and the first side surface 141 is detachably connected to the insulating member 3 to fix the first side surface 141. In this embodiment, a detachable connection is provided between the first side portion 141 and the insulating member 3. This can prevent the first side portion 141 from falling off and affecting the insulation effect on the battery cell 2. At the same time, the first side portion 141 can also limit the insulating member 3 to prevent the side of the cover plate 4 without the pole ear 22 from warping up, which is beneficial to further improve the stress conditions of the top cover assembly and the pole ear 22.

[0049] It should be noted that after the first side portion 141 covers the opening structure 111 , the first side portion 141 may also be connected to the insulating member 3 by hot melting or gluing.

[0050] Furthermore, if Figure 1 and Figure 3 In the example, the side portion 14 specifically includes a first side portion 141 and a second side portion 142, the second side portion 142 is connected to the second main surface portion 12, and the first side portion 141 is connected to an end of the second side portion 142 away from the second main surface portion 12. When the battery cell body 21 is wrapped, the second side portion 142 covers the side end surface of the battery cell body 21, and the first side portion 141 covers the opening structure 111 on the first main surface portion 11.

[0051] Furthermore, considering that only the flip point 33 is designed on the side of the insulating member 3 facing the first side portion 141, in order to minimize the improvement of the structure of the insulating member 3 on the basis that the insulating member 3 and the first side portion 141 can be connected, as shown in FIG. Figures 2 to 4 As shown, in the first direction, the end of the substrate 31 of the insulating member 3 away from the pole ear 22 has a first protruding structure 311, and the end of the flip plate 32 away from the pole ear 22 has a second protruding structure 321. The height direction of the battery cell 2 is the third direction. In the third direction, the first protruding structure 311 and the second protruding structure 321 are arranged opposite to each other and can be flipped and connected, wherein the flip point 33 is the flippable connection between the first protruding structure 311 and the second protruding structure 321. Correspondingly, a snap-fit ​​hole 1411 is provided at a position corresponding to the flip point 33 on the first side portion 141, and the first protruding structure 311 and the second protruding structure 321 are snapped into the corresponding snap-fit ​​hole 1411 together to form a snap-fit ​​fit, so that the first side portion 141 and the insulating member 3 are connected and fixed.

[0052] In this embodiment, in order to simplify the flip-able connection structure between the flip plate 32 and the substrate 31, a first protrusion structure 311 and a second protrusion structure 321 are designed, the first protrusion structure 311 and the substrate 31 are integrally formed, and the second protrusion structure 321 and the flip plate 32 are integrally formed, and a fold is formed between the first protrusion structure 311 and the second protrusion structure 321, and the flip plate 32 and the substrate 31 can be flipped around the fold, which is convenient for manufacturing; and in order not to make major changes to the structure of the insulating part 3, that is, not to change the injection mold of the molded insulating part, a snap-in hole 1411 is set on the first side portion 141, and the detachable connection between the first side portion 141 and the insulating part 3 is realized by inserting the first protrusion structure 311 and the second protrusion structure 321 together into the snap-in hole 1411, thereby achieving the purpose of pulling the insulating part 3 through the first side portion 141.

[0053] Furthermore, in order to make the connection between the first side portion 141 and the first protruding structure 311 and the second protruding structure 321 more stable, and to make the first side portion 141 better pull the insulating member 3, as shown in FIG. Figure 2 and Figure 4As shown, the first protruding structure 311 is provided with a first clamping groove 3111, and the first clamping groove 3111 is located on the side of the first protruding structure 311 away from the second protruding structure 321 in the third direction; correspondingly, the second protruding structure 321 is provided with a second clamping groove 3211, and the second clamping groove 3211 is located on the side of the second protruding structure 321 away from the first protruding structure 311 in the third direction. The first clamping groove 3111 and the second clamping groove 3211 are respectively clamped and matched with the edge portion of the first side portion 141 surrounding the clamping hole 1411, so that the first side portion 141 is connected and fixed to the insulating member 3. Since the first clamping groove 3111 and the second clamping groove 3211 can limit the first side portion 141 in the first direction, the fixing effect is better.

[0054] In this embodiment, the elasticity of the first side portion 141 is utilized to design that when the first protruding structure 311 and the second protruding structure 321 are inserted into the snap-fitting hole 1411, the snap-fitting hole 1411 can be expanded, that is, the edge portion of the first side portion 141 is compressed. When the edge portion of the first side portion 141 is facing the first snap-fitting groove 3111 and the second snap-fitting groove 3211, the edge portion of the first side portion 141 shrinks and snaps into the first snap-fitting groove 3111 and the second snap-fitting groove 3211 respectively, thereby achieving a stable connection between the first side portion 141 and the insulating member 3.

[0055] Among them, preferably, Figure 1 In the example, the snap-fit ​​hole 1411 can be set as a long hole, and the first protrusion structure 311 and the second protrusion structure 321 can be set to extend a distance along the second direction, thereby increasing the contact area of ​​the snap-fit ​​and further enhancing the connection stability.

[0056] Furthermore, in order to facilitate the first protrusion structure 311 and the second protrusion structure 321 to be inserted into the engaging hole 1411 together, and to facilitate the edge portion of the engaging hole 1411 to be respectively engaged in the first engaging groove 3111 and the second engaging groove 3211, as shown in FIG. Figure 2 and Figure 4In the example, a first inclined portion 3112 is further provided on the first protruding structure 311, and the first inclined portion 3112 is located on a side of the first protruding structure 311 away from the second protruding structure 321 in the third direction; in the first direction, the first inclined portion 3112 is specifically located between the first card slot 3111 and the flip point 33, and the first inclined portion 3112 is inclined relative to the first direction; in the third direction, a distance between an end of the first inclined portion 3112 close to the first card slot 3111 and the cover plate 4 is smaller than a distance between an end of the first inclined portion 3112 away from the first card slot 3111 and the cover plate 4, that is, in a direction close to the flip point 33 along the first direction, the first inclined portion 3112 gradually inclines toward the direction close to the second protruding structure 321. Similarly, a second inclined portion 3212 is also provided on the second protruding structure 321, and the second inclined portion 3212 is located on a side of the second protruding structure 321 in the third direction away from the first protruding structure 311; in the first direction, the second inclined portion 3212 is specifically located between the second card slot 3211 and the flip point 33, and the second inclined portion 3212 is inclined relative to the first direction; in the third direction, the distance between the end of the second inclined portion 3212 close to the second card slot 3211 and the cover plate 4 is smaller than the distance between the end of the second inclined portion 3212 away from the second card slot 3211 and the cover plate 4, that is, in the direction of the flip point 33 along the first direction, the second inclined portion 3212 gradually inclines toward the direction close to the first protruding structure 311. The first protruding structure 311 and the second protruding structure 321 are matched to form a structure with a trapezoidal or triangular cross-section, so that when inserting into the snap-in hole 1411, the first inclined surface 3112 and the second inclined surface 3212 can be used as a guide, so that positioning and insertion operations can be quickly performed, which is beneficial to improving assembly efficiency.

[0057] In a further embodiment of the present invention, Figure 2 , Figure 3 and Figure 5As shown, there are two side faces 14 of the insulating film 1. In the second direction, one side face 14 is connected to each of the two opposite ends of the second main face 12, and each side face 14 has a first side 141. Among them, the dimension of the first side 141 in the third direction is b, and correspondingly, the dimension of the substrate 31 in the first direction is W. The following relationship is satisfied between the two: (0.5×W) < b < (1.5×W), that is, the value range of b can be 0.5 times or 0.7 times or 0.9 times or 1.1 times or 1.3 times or 1.5 times of W to meet the requirement of covering the opening structure 111 in the third direction. Similarly, the dimension of the first side 141 in the second direction is a, and the dimension of the substrate 31 in the second direction is L, and the following relationship is satisfied between the two: (0.2×L) < a < (0.7×L), that is, the value range of a can be between 0.2 times or 0.3 times or 0.4 times or 0.5 times or 0.6 times or 0.7 times of L to meet the requirement of covering the opening structure 111 in the second direction.

[0058] Although the first side 141 only needs to cover the opening structure 111, in practical applications, the corresponding dimension values can be set with reference to the above relationship according to specific usage requirements.

[0059] It should be noted that the lengths a and widths b of the two first sides 141 located on both sides of the second main face 12 can be the same or different.

[0060] In a further embodiment of the present invention, as Figure 2 shown, the tab 22 further includes an electrical connection portion 223. The electrical connection portion 223 is connected to one end of the bent portion 222 away from the cell body 21, and the electrical connection portion 223 is used to form an electrical connection with the terminal post. The electrical connection portion 223 is located between the flip plate 32 and the substrate 31, and the flip plate 32 is in contact with the main end face 211 of the cell body 21 to provide support for both sides of the electrical connection portion 223 of the tab 22 through the flip plate 32 and the substrate 31, thereby improving the overall stress condition of the tab 22. It can be understood that in the case of only the substrate 31, the tab 22 is stressed unidirectionally, which easily causes the electrical connection portion 223 of the tab 22 to bend towards the direction of the main end face 211 of the cell body 21 and even contact the main end face 211 to form the phenomenon of reverse insertion of the tab 22. In this embodiment, the flip plate 32 is used to support the electrical connection portion 223 of the tab 22, which can effectively improve the stress condition of the tab 22 and prevent the above phenomenon from occurring.

[0061] Furthermore, as Figure 2In the example, the end of the bent portion 222 of the tab 22 connected to the cell body 21 is the lead-out portion 221, that is, the tab 22 is led out from the inside of the cell body 21 through the lead-out portion 221, and the lead-out portion 221, the bent portion 222 and the electrical connection portion 223 are connected in sequence. It should be noted that in the production stage, the initial state of the tab 22 is usually a flat sheet structure, such as Figure 6 In the state shown in FIG. 1 , the tab 22 is bent during the assembly process to change the shape and extension direction of a part of the structure of the tab 22 , thereby forming a bent portion 222 and an electrical connection portion 223 .

[0062] In a further embodiment of the present invention, Figure 6 and Figure 7 As shown, two pole ears 22 are led out from the main end surface 211 of the battery cell body 21, and the polarities of the two pole ears 22 are opposite, one is a positive pole ear, and the other is a negative pole ear. Correspondingly, the number of flip plates 32 of the top cover assembly is also two, and they form a one-to-one correspondence with the pole ears 22; the number of opening structures 111 on the insulating film 1 is also two, and they form a one-to-one correspondence with the flip plates 32. In this embodiment, an opening structure 111 and a flip plate 32 are correspondingly provided for each pole ear 22, and the assembly operation is that each flip plate 32 flips through a corresponding opening structure 111 and flips to a position corresponding to the pole ear 22, so as to facilitate a separate bending operation on each pole ear 22, such as Figure 7 In the example, the assembly operation is relatively flexible and accurate. After the assembly is completed, the corresponding first side portion 141 is turned over and covered on the corresponding opening structure 111, such as Figure 8 The example in , to achieve the coating of battery cell 2.

[0063] Furthermore, if Fig. 9 In the example in FIG. 1 , an auxiliary portion 15 is further provided on the first main surface portion 11. The auxiliary portion 15 is located at the opening structure 111. In the third direction, one end of the auxiliary portion 15 is flippably connected to the first end surface portion 13. The auxiliary portion 15 can flip relative to the first end surface portion 13 to open or close the corresponding opening structure 111. Each opening structure 111 is provided with an auxiliary portion 15 to be opposite to a flip plate 32. During the assembly operation, the auxiliary portion 15 is connected to the first end surface portion 13. Figure 7 and Fig. 9 When the flip plate 32 flips through the corresponding opening structure 111, it can drive the corresponding auxiliary part 15 to flip together, so that the auxiliary part 15 is located at the laser welding mark of the pole ear 22 and the connecting piece 5. On the one hand, it can insulate the pole ear 22, and on the other hand, it can prevent welding slag from falling onto the battery body 21 when the pole ear 22 and the connecting piece 5 are welded, so as not to affect the battery performance.

[0064] In a further embodiment of the present invention, Figure 3 as well as Figures 5 to 7 As shown, a first buckle portion 312 is provided on the side of the substrate 31 facing the flip plate 32, and correspondingly, a corresponding second buckle portion 322 is provided on the side of the flip plate 32 facing the substrate 31, and the second buckle portion 322 is arranged corresponding to the first buckle portion 312. Correspondingly, a positioning hole 132 is opened on the first end face portion 13 of the insulating film 1, and the positioning hole 132 is arranged corresponding to the same group of first buckle portions 312 and second buckle portions 322. During the assembly operation, after the flip plate 32 flips through the opening structure 111, it flips to the side of the first end face portion 13 away from the substrate 31, that is, the flip plate 32 and the substrate 31 are respectively located on both sides of the first end face portion 13, and a corresponding group of first buckle portions 312 and second buckle portions 322 pass through the corresponding positioning holes 132 to form a buckle, so as to achieve the connection and fixation between the flip plate 32 and the substrate 31. The positioning hole 132 on the first end surface portion 13 can not only reserve a fastening space for the first fastening portion 312 and the second fastening portion 322 , but also play a positioning role during the fastening operation, which is beneficial to improving the fastening accuracy and operation efficiency.

[0065] It should be noted that at least one second buckling portion 322 is provided on each flip plate 32, and the number of the first buckling portions 312 on the base plate 31 is set according to the number of the second buckling portions 322, and the number of the positioning holes 132 is set according to the number of the first buckling portions 312 and the second buckling portions 322. Figure 3 and Figure 7 In the example, there are two flip plates 32. In the second direction, a second snap-fitting portion 322 is provided near both ends of each flip plate 32, and a first snap-fitting portion 312 is provided at a corresponding position on the base plate 31, that is, a total of four second snap-fitting portions 322 are provided on the two flip plates 32, and a total of four first snap-fitting portions 312 are provided on the base plate 31. Correspondingly, four positioning holes 132 are provided on the first end surface portion 13.

[0066] In addition, in practical applications, such as Figure 1 , Figure 2 , Figure 5 , Figure 6 In the example in FIG. 1 , the cover plate 4 of the top cover assembly may also be provided with corresponding pole holes and explosion-proof holes to respectively correspond to the poles and explosion-proof valves. The pole lugs 22 are welded to the connecting pieces 5 and are conductively connected to the poles through the connecting pieces 5, so that the two poles form the positive and negative poles of the battery cell. According to the use requirements, the battery cell may also be provided with a corresponding housing to protect the battery cell.

[0067] In addition, if Figures 6 to 8In the example in FIG. 1 , the end of the second main surface portion 12 of the insulating film 1 away from the first end surface portion 13 may also be connected to a second end surface portion for covering the second end surface of the battery cell body 21 opposite to the main end surface 211. After the insulating film 1 is covered, the corresponding position of the bottom of the battery cell 2 can be connected and fixed by gluing, and the side surface portion 14 is fixed by clamping with the first protruding structure 311 and the second protruding structure 321.

[0068] An embodiment of the second aspect of the present invention further provides an electric device, comprising the battery cell in any of the above embodiments, so as to supply power to the electric device through the battery cell.

[0069] It should be noted that the electrical equipment in this embodiment includes but is not limited to electric vehicles, and may also be other equipment or devices applicable to the battery cells in the above embodiments.

[0070] In practical applications, multiple battery cells can be combined to form a battery module or battery pack to improve power supply capacity.

[0071] Therefore, the electrical equipment in this embodiment should have all the beneficial effects of the battery cell in any of the above embodiments, which will not be described in detail here.

[0072] Embodiment 2

[0073] The basic structure of a battery cell of this embodiment is the same as that of the first embodiment, except that: Fig.10 and Fig.11 As shown, the main end surface 211 of the battery body 21 leads to two pole ears 22, and the polarities of the two pole ears 22 are opposite, one is a positive pole ear, and the other is a negative pole ear. Correspondingly, the number of flip plates 32 is also two, and they form a one-to-one correspondence with the pole ears 22; and the number of opening structures 111 is one, and one opening structure 111 is simultaneously provided corresponding to two flip plates 32. During the assembly operation, the opening structure 111 can allow the two flip plates 32 to flip through, that is, the two flip plates 32 pass through the same opening structure 111 and flip to the matching position of their respective corresponding pole ears 22, as shown in FIG. Fig.11 The status shown in .

[0074] Furthermore, if Fig.14 , Fig.15 and Fig.16 As shown, the first main surface 11 is further provided with an auxiliary portion 15, which is located at the opening structure 111, and in the third direction, one end of the auxiliary portion 15 is flipably connected to the first end surface 13, and the auxiliary portion 15 can be flipped relative to the first end surface 13 to open or close the corresponding opening structure 111. Figure 7 and Fig. 9When the flip plate 32 flips through the opening structure 111, it can drive the auxiliary part 15 to flip together, so that the auxiliary part 15 is located at the laser welding mark of the pole ear 22 and the connecting piece 5, such as Fig.16 The state shown in FIG. 1 can insulate the tab 22 on the one hand, and can prevent welding slag from falling onto the cell body 21 when the tab 22 is welded to the connecting piece 5 on the other hand, so as not to affect the battery performance. Among them, since there is only one flip plate 32 and one auxiliary part 15, and one auxiliary part 15 corresponds to two tabs 22 at the same time, the shielding area of ​​the auxiliary part 15 can be further increased, and the effect of preventing welding slag from falling is better.

[0075] Embodiment 3

[0076] The basic structure of a battery cell of this embodiment is the same as that of the second embodiment, except that: Fig.12 and Fig.13 As shown, the main end surface 211 of the battery body 21 leads to two pole ears 22, and the polarities of the two pole ears 22 are opposite, one is a positive pole ear, and the other is a negative pole ear. The number of the flip plate 32 and the opening structure 111 is one, and the flip plate 32 and the opening structure 111 are correspondingly arranged and form a one-to-one correspondence; the two pole ears 22 are arranged corresponding to the same flip plate 32. During the assembly operation, the opening structure 111 can allow the flip plate 32 to flip through, and the flip plate 32 can flip and match the two pole ears 22 at the same time, as shown in FIG. Fig.13 After assembly, the electrical connection parts 223 of the two tabs 22 are located between the substrate 31 and the flip plate 32, so that the two electrical connection parts 223 are supported on both sides by one flip plate 32 and one substrate 31. In this embodiment, only one opening structure 111 and one flip plate 32 are provided, which cooperate with the two tabs 22 at the same time, which is conducive to simplifying the processing operation and can simplify the assembly operation process.

[0077] The basic principle of the present invention is described above in conjunction with specific embodiments. However, it should be pointed out that the advantages, strengths, effects, etc. mentioned in the present invention are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. must be possessed by each embodiment of the present invention. In addition, the specific details disclosed above are only for the purpose of illustration and facilitation of understanding, rather than limitation, and the above details do not limit the present invention to being implemented by adopting the above specific details.

[0078] The block diagrams of the devices, apparatuses, equipment, and systems involved in the present invention are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them. It should also be noted that in the apparatus and equipment of the present invention, the components can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalents of the present invention.

[0079] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize some variations, modifications, changes, additions and sub-combinations thereof. The above description of the disclosed aspects is provided to enable any technician in the field to make or use the present invention. Various modifications to these aspects are very obvious to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the present invention. Therefore, the present invention is not intended to be limited to the aspects shown herein, but in accordance with the widest scope consistent with the principles and novel features of this invention.

[0080] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery cell, characterized in that: include: A battery cell (2), the battery cell (2) comprising a battery cell body (21) and a pole ear (22), the pole ear (22) being led out from a main end surface (211) of the battery cell body (21), and the pole ear (22) comprising a bent portion (222); A top cover assembly, the top cover assembly comprising a cover plate (4) and an insulating member (3), the insulating member (3) comprising a base plate (31) and a flip plate (32), the base plate (31) and the flip plate (32) being flippably connected, the flippable connection between the base plate (31) and the flip plate (32) being a flip point (33); in a first direction, the bending portion (222) and the flip point (33) are arranged opposite to each other, the first direction being the thickness direction of the battery cell (2); An insulating film (1), the insulating film (1) covering the battery cell (2); the insulating film (1) comprises a first end face portion (13), a first main face portion (11) and a side face portion (14), the first end face portion (13) being arranged between the cover plate (4) and the main end face (211) of the battery cell body (21); the first end face portion (13) having a first connection end (131) arranged away from the bending portion (222) in a first direction; the first connection end (131) is connected to the first main face portion (11); an opening structure (111) is arranged at a position of the first main face portion (11) corresponding to the flip point (33), the opening structure (111) being configured to allow the flip plate (32) to pass through when the substrate (31) and the flip plate (32) are flipped relative to each other; at least a portion of the side face portion (14) covers the opening structure (111).

2. The battery cell according to claim 1, characterized in that: The insulating film (1) further comprises a second main surface portion (12), wherein the second main surface portion (12) is connected to one end of the first end surface portion (13) in the first direction away from the first main surface portion (11); at least one end of the second main surface portion (12) in the second direction is connected to the side surface portion (14), wherein the side surface portion (14) has a first side portion (141), wherein the first side portion (141) covers the opening structure (111), and the first side portion (141) and the insulating member (3) are detachably connected; wherein the second direction is the length direction of the battery cell (2).

3. The battery cell according to claim 2, characterized in that: The base plate (31) has a first protruding structure (311), and the flip plate (32) has a second protruding structure (321) that is flippably connected to the first protruding structure (311); the flip point (33) is a flippable connection between the first protruding structure (311) and the second protruding structure (321); The second protruding structure (321) and the first protruding structure (311) are arranged opposite to each other along a third direction, and the third direction is a height direction of the battery cell (2); A snap-in hole (1411) is provided at a position of the first side portion (141) corresponding to the flip point (33), and the first protrusion structure (311) and the second protrusion structure (321) are snapped into the corresponding snap-in hole (1411) together, so that the first side portion (141) and the insulating member (3) are connected.

4. The battery cell according to claim 3, characterized in that: In the third direction, a first clamping groove (3111) is provided on a side of the first protrusion structure (311) away from the second protrusion structure (321), and a second clamping groove (3211) is provided on a side of the second protrusion structure (321) away from the first protrusion structure (311), and both the first clamping groove (3111) and the second clamping groove (3211) are clamped with an edge portion surrounding the clamping hole (1411).

5. The battery cell according to claim 4, characterized in that: The first protruding structure (311) has a first inclined portion (3112) arranged away from the second protruding structure (321) in the third direction; the first inclined portion (3112) is located between the first clamping groove (3111) and the flip point (33); in the third direction, the distance between an end of the first inclined portion (3112) close to the first clamping groove (3111) and the cover plate (4) is smaller than the distance between an end of the first inclined portion (3112) away from the first clamping groove (3111) and the cover plate (4); The second protruding structure (321) has a second inclined portion (3212) arranged away from the first protruding structure (311) in the third direction; the second inclined portion (3212) is located between the second card slot (3211) and the flip point (33); in the third direction, the distance between an end of the second inclined portion (3212) close to the second card slot (3211) and the cover plate (4) is greater than the distance between an end of the second inclined portion (3212) away from the second card slot (3211) and the cover plate (4).

6. The battery cell according to claim 2, characterized in that: The second main surface (12) is connected to side surfaces (14) at both ends in the second direction, and each of the side surfaces (14) has a first side portion (141); the size of the first side portion (141) in the third direction is b, the size of the substrate (31) in the first direction is W, and (0.5×W) <b<(1.5×W); The dimension of the first side portion (141) in the second direction is a, the dimension of the substrate (31) in the second direction is L, and (0.2×L) <a<(0.7×L)。 7. The battery cell according to any one of claims 1 to 6, characterized in that: The pole ear (22) further comprises an electrical connection portion (223), wherein the electrical connection portion (223) is connected to an end of the bending portion (222) away from the battery cell body (21); the electrical connection portion (223) is located between the flip plate (32) and the base plate (31); and the flip plate (32) is in contact with the main end surface (211) of the battery cell body (21).

8. The battery cell according to claim 7, characterized in that: The main end surface (211) of the battery cell body (21) leads to two pole ears (22) with opposite polarities; the flip plate (32) and the pole ears (22) are in a one-to-one correspondence, and the flip plate (32) and the opening structure (111) are in a one-to-one correspondence.

9. The battery cell according to claim 7, characterized in that: The main end surface (211) of the battery cell body (21) leads to two pole ears (22) with opposite polarities; The flip plates (32) and the tabs (22) are in a one-to-one correspondence, and the opening structure (111) is configured to allow two flip plates (32) to flip through; Alternatively, the two electrical connection portions (223) are both located between the flip plate (32) and the base plate (31), and the flip plate (32) and the opening structure (111) are in a one-to-one correspondence.

10. An electrical device, characterized in that: include: A battery cell as claimed in any one of claims 1 to 9.

Images