Battery and electric device

Abstract

The utility model discloses a battery and a power utilization device, and belongs to the technical field of batteries, the battery comprises a shell, a battery cell, a top cover, an insulating film and a top cover leveling matching structure, the battery cell is accommodated in the shell, the battery cell is provided with a tab, the tab is arranged on the first side of the battery cell in the thickness direction of the tab, and one end, far away from the battery cell, of the tab is bent towards the second side of the battery cell in the thickness direction of the tab; the top cover is buckled at the opening end of the shell and is arranged on one side, provided with the tab, of the battery cell, and one end, far away from the battery cell, of the tab is connected with the top cover; the insulating film is coated on the surface of the battery cell; the top cover leveling matching structure comprises a first connecting piece and a second connecting piece, the first connecting piece is arranged on the top cover, the second connecting piece is arranged on the insulating film, the first connecting piece and the second connecting piece are connected and matched with each other, and the top cover leveling matching structure is arranged on the second side of the battery cell in the thickness direction of the battery cell. The top cover can be leveled, and the welding quality of the top cover and the shell is guaranteed.

Description

Technical Field

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

[0002] The battery is encapsulated in a shell to form a battery. In order to improve the space utilization of the battery, usually one battery cell is encapsulated in the shell.

[0003] The cell tabs are welded to one side of the top cover along the cell's thickness, with the tabs bent toward the other side. The housing contains a cavity for the cell. After the cell is installed, the top cover is welded to the housing to complete the cell packaging. However, when the tabs are short, they tend to tilt upward, causing the other side of the top cover to tilt. This causes the top cover to tilt unevenly after the cell is installed, affecting the weld between the top cover and the housing. Utility Model Content

[0004] The utility model aims to provide a battery and an electrical device to solve the technical problem in the prior art that after a single battery cell is installed in a shell, the top cover is tilted and uneven, which affects the welding between the top cover and the shell.

[0005] As conceived above, the technical solution adopted by the utility model is:

[0006] Batteries, including:

[0007] case;

[0008] A battery cell is accommodated in the housing, wherein the battery cell is provided with a tab, the tab being arranged on a first side of the battery cell along its thickness direction, and an end of the tab away from the battery cell is bent toward a second side of the battery cell along its thickness direction;

[0009] A top cover is fastened to the open end of the shell and is arranged on the side of the battery cell where the tab is provided, and the end of the tab away from the battery cell is connected to the top cover;

[0010] An insulating film is provided on the surface of the battery cell;

[0011] The top cover flattening fitting structure includes a first connector and a second connector, the first connector is arranged on the top cover, the second connector is arranged on the insulating film, the first connector and the second connector are connected and fitted with each other, and the top cover flattening fitting structure is arranged on the second side of the battery cell along its own thickness direction.

[0012] As a preferred embodiment of the above-mentioned battery, one of the first connector and the second connector is a hook-shaped structure, and the other is a hole. The hook-shaped structure includes a connecting portion and a perforated portion. The perforated portion is connected to one end of the connecting portion and passes through the hole.

[0013] As a preferred embodiment of the above-mentioned battery, the first connecting member is a hook-shaped structure, the second connecting member is a hole, one end of the connecting portion is connected to the top cover, the perforated portion is arranged at the other end of the connecting portion, and the hole is arranged in the insulating film.

[0014] As a preferred embodiment of the above-mentioned battery, the hook-shaped structure further includes an anti-detachment portion, which is provided at an end of the perforated portion away from the connecting portion, and extends toward the top cover.

[0015] As a preferred embodiment of the above battery, a strip structure is provided on the insulating film, two ends of the strip structure are fixedly connected to the insulating film, and the hole is formed between the strip structure and the insulating film.

[0016] As a preferred embodiment of the above-mentioned battery, one end of the strip structure is connected to one side of the insulating film in the length direction of the battery cell, and the other end of the strip structure is connected to the other side of the insulating film in the length direction of the battery cell, and the length of the strip structure is greater than or equal to the length of the top cover.

[0017] As a preferred embodiment of the above-mentioned battery, two openings are spaced apart on the insulating film, the perforated portion passes through one of the openings and passes through the other opening, and the hole is formed between the insulating film between the two openings and the remaining portion of the insulating film.

[0018] As a preferred embodiment of the above battery, the insulating film includes:

[0019] a first covering film, the first covering film covering a surface of the battery cell facing the top cover, the second connector being disposed on the first covering film;

[0020] Two second covering films, one second covering film is provided on opposite sides of the first covering film along the thickness direction of the battery cell, and the two second covering films cover the two largest side surfaces of the battery cell one by one;

[0021] a third covering film, disposed on one end of the second covering film away from the first covering film;

[0022] The fourth covering film is arranged on one end of the other second covering film away from the first covering film. The third covering film and the fourth covering film jointly cover a side of the battery cell away from the top cover, and the two form an overlapping area.

[0023] As a preferred embodiment of the above battery, the thickness of the fourth coating film is greater than the thickness of the third coating film; and / or

[0024] The third covering film and the fourth covering film are detachably connected.

[0025] An electrical device comprising the above-mentioned battery.

[0026] Beneficial effects of the utility model:

[0027] When assembling the battery proposed by the present invention, the battery cell is installed in the shell, and the first connector and the second connector of the top cover flattening matching structure are connected and matched with each other. When the length of the tab is short, since the tab is arranged on the first side of the battery cell along its own thickness direction, the end of the tab away from the battery cell is bent toward the second side of the battery cell along its own thickness direction, so the tab has an upward supporting force on the second side of the top cover in the thickness direction. Under the action of the tab, the second side of the top cover in the thickness direction of the battery cell will be tilted upward; however, since the top cover flattening matching structure is arranged on the second side of the battery cell along its own thickness direction, under the action of the top cover flattening matching structure, the second connector pulls the second side of the top cover in the thickness direction of the battery cell downward toward the battery cell through the first connector, thereby being able to flatten the tilted top cover. Under the action of the top cover flattening matching structure, the top cover is flattened, so that the top cover is in a state parallel to the upper surface of the battery cell, ensuring the welding quality between the top cover and the shell. At the same time, by providing a top cover flattening matching structure, a gap is ensured between the upper surface of the insulating film and the top cover, thereby reducing the impact of high temperature generated by welding the top cover and the shell on the insulating film.

[0028] The electrical device disclosed herein includes the aforementioned battery. In the aforementioned battery, the top cover is flattened by the top cover leveling structure, thereby maintaining the top cover parallel to the upper surface of the battery cell and ensuring the quality of the weld between the top cover and the housing. The top cover leveling structure ensures a gap between the upper surface of the insulating film and the top cover, thereby reducing the impact of high temperatures generated during welding of the top cover to the housing on the insulating film. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0030] Figure 1 This is a schematic diagram of the installation of the top cover, tabs and battery cells provided in the first embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the top cover being flattened after the battery provided in the first embodiment of the present invention is assembled;

[0032] Figure 3 This is a schematic diagram of the first connecting member provided in the first embodiment of the present utility model being arranged on the top cover;

[0033] Figure 4 yes Figure 3 A schematic diagram of the dimensions of the first connecting member;

[0034] Figure 5 This is a bottom view of the top cover provided in Example 1 of the present utility model;

[0035] Figure 6 This is a side view of the top cover provided in Example 1 of the present utility model;

[0036] Figure 7 This is a schematic diagram of the expansion of the insulating film provided in the first embodiment of the present utility model;

[0037] Figure 8 This is a schematic diagram of the insulating film provided in the first embodiment of the present invention when it is not properly installed on the battery cell;

[0038] Figure 9 This is a schematic diagram of the insulating film provided in the first embodiment of the present invention when it is installed in place on the battery cell;

[0039] Figure 10 yes Figure 9 Enlarged view of point A in the middle.

[0040] In the picture:

[0041] 1. Battery cells;

[0042] 2. Tabs;

[0043] 3. Top cover; 31. Top cover plate; 32. Insulator; 33. Positive pole; 34. Explosion-proof valve; 35. Negative pole; 36. Liquid injection hole;

[0044] 4. Insulating film; 41. First covering film; 42. Second covering film; 43. Third covering film; 431. First buckle; 44. Fourth covering film; 441. Second buckle;

[0045] 51. First connecting member; 511. Connecting portion; 512. Perforated portion; 513. Anti-slip portion; 52. Second connecting member;

[0046] 6. Strip structure. DETAILED DESCRIPTION

[0047] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0048] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0049] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0050] In the description of the present utility model, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0051] It should also be noted that, in the description of this utility model, unless otherwise specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0052] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0053] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0054] Example 1

[0055] In order to improve the space utilization of the battery, it is more and more common to have a single cell in the battery. Single cell can increase the capacity and energy of the battery under the same size, but, see Figure 1 , since the tab 2 of the cell 1 is welded to one side of the top cover 3 along the thickness direction of the cell 1 ( Figure 1 In the free state, the tab 2 welded on the top cover 3 has the inertia of tilting upward, which causes the other side of the top cover 3 (i.e. Figure 1 The second side of the top cover 3 will be tilted. If the top cover 3 is not flat, it will affect the welding between the top cover 3 and the shell.

[0056] See also Figures 1-6 , this embodiment provides a battery that can be used in electrical devices.

[0057] Specifically, electrical devices include but are not limited to: mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys and electric tools, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers.

[0058] Specifically, see Figure 1 and Figure 2 In this embodiment, the battery includes a shell (not shown in the figure), a battery cell 1, a top cover 3, an insulating film 4 and a top cover flattening matching structure.

[0059] The battery cell 1 is housed in the housing. Figure 1 The battery cell 1 is provided with a tab 2, which is arranged on a first side of the battery cell 1 along its own thickness direction, and an end of the tab 2 away from the battery cell 1 is bent toward a second side of the battery cell 1 along its own thickness direction.

[0060] The top cover 3 is buckled onto the open end of the shell and is arranged on the side of the battery cell 1 where the tab 2 is provided. The end of the tab 2 away from the battery cell 1 is connected to the top cover 3 .

[0061] Specifically, the battery cell 1 is installed in place, and when the top cover 3 is welded, the circumference of the top cover 3 is welded to the circumference of the opening end of the shell, thereby completing the packaging of the battery cell 1.

[0062] The insulating film 4 is provided on the surface of the battery core 1. The insulating film 4 can prevent the battery core 1 from short-circuiting due to contact with the shell.

[0063] See also Figure 2 、 Figure 5 、 Figure 6 、 Figure 9 and Figure 10 The top cover flattening matching structure includes a first connecting member 51 and a second connecting member 52. The first connecting member 51 is arranged on the top cover 3, and the second connecting member 52 is arranged on the insulating film 4. The first connecting member 51 and the second connecting member 52 are connected and matched with each other. The top cover flattening matching structure is arranged on the second side of the battery cell 1 along its own thickness direction.

[0064] When assembling the battery provided in this embodiment, the battery cell 1 is installed in the shell, and the first connector 51 and the second connector 52 of the top cover flattening structure are connected and matched with each other. When the length of the tab 2 is short, since the tab 2 is arranged on the first side of the battery cell 1 along its own thickness direction, and the end of the tab 2 away from the battery cell 1 is bent toward the second side of the battery cell 1 along its own thickness direction, the tab 2 exerts an upward support force on the second side of the top cover 3 along the battery cell thickness direction. Under the action of the tab 2, the second side of the top cover 3 along the battery cell thickness direction will bend upward; however, since the top cover flattening structure is arranged on the second side of the battery cell 1 along its own thickness direction, under the action of the top cover flattening structure, the second connector 52 pulls the second side of the top cover 3 downward toward the battery cell 1 through the first connector 51, thereby pulling down the tilted top cover 3. Under the action of the top cover flattening structure, the top cover 3 is flattened, so that the top cover 3 is in a state parallel to the upper surface of the battery cell 1, ensuring the welding quality between the top cover 3 and the shell.

[0065] At the same time, in this embodiment, by providing a top cover flattening fitting structure, a gap is ensured between the upper surface of the insulating film 4 and the top cover 3, thereby reducing the impact of high temperature generated by welding the top cover 3 and the shell on the insulating film.

[0066] For example, if the insulating film 4 is fixed to the top cover 3 by hot melt, snap fastening, or other fixing methods, the insulating film 4 will be closely attached to the lower surface of the top cover 3. In this case, the portion of the insulating film 4 that is closely attached to the top cover 3 is close to the weld between the top cover 3 and the housing, making the insulating film 4 susceptible to the high temperature of welding. In this embodiment, the flattened top cover structure can prevent the insulating film 4 from being affected by the high temperature of welding, further ensuring the quality of the battery.

[0067] Specifically, in this embodiment, the tabs 2 include a positive tab and a negative tab.

[0068] Along the thickness direction of the battery cell 1, a first connector 51 is provided opposite the positive tab. Furthermore, the number of first connectors 51 provided opposite the positive tab can be one, two, or more. The number of first connectors 51 opposite the positive tab is sufficient to ensure that the downward pull on the top cover 3 after the first connector 51 and the second connector 52 are connected is balanced with the upward support force on the top cover 3 by the positive tab, ensuring that the top cover 3 is flattened. This number can be set as needed and is not subject to further restrictions.

[0069] Similarly, along the thickness direction of the battery cell 1, a first connector 51 is also provided opposite the negative tab. Furthermore, the number of first connectors 51 provided opposite the negative tab can be one, two, or more. The number of first connectors 51 opposite the negative tab is sufficient to ensure that the downward pull on the top cover 3 after the first connector 51 and the second connector 52 are connected is balanced with the upward support force on the top cover 3 by the negative tab, ensuring that the top cover 3 is flattened. The number can be set as needed, and there are no further restrictions here.

[0070] Optionally, in this embodiment, one of the first connecting member 51 and the second connecting member 52 is a hook-shaped structure, and the other is a hole. The hook-shaped structure includes a connecting portion 511 and a perforated portion 512. The perforated portion 512 is connected to one end of the connecting portion 511 and passes through the hole.

[0071] Furthermore, the first connecting member 51 is a hook-shaped structure, the second connecting member 52 is a hole, one end of the connecting portion 511 is connected to the top cover 3 , the perforated portion 512 is provided at the other end of the connecting portion 511 , and the hole is provided in the insulating film 4 .

[0072] More specifically, the height of the first connector 51 is set to be consistent with the height of the tab 2 after the battery is assembled in place. In this way, when the insulating film 4 is wrapped and tightened into place, the lower end of the first connector 51 just contacts the top of the battery cell 1, and this indicates that the top cover 3 is in a horizontal state.

[0073] Specifically, the height of the connecting portion 511 is set to be consistent with the height of the tab 2 after the battery is assembled in place; when the insulating film 4 is wrapped and tightened into place, the lower end of the first connecting member 51, that is, the lower surface of the perforated portion 512, just contacts the top of the battery cell 1, indicating that the top cover 3 is in a horizontal state.

[0074] Specifically, see Figure 4-Figure 6 In this embodiment, the dimension of the connecting portion 511 in the height direction is a; the dimension of the perforated portion 512 in the thickness direction of the battery cell 1 is b, and the dimension of the perforated portion 512 in the length direction of the battery cell 1 is d. Furthermore, in order to prevent the perforated portion 512 from detaching from the hole, the hook-shaped structure also includes an anti-detachment portion 513, which is arranged at one end of the perforated portion 512 away from the connecting portion 511, and the anti-detachment portion 513 extends toward the top cover 3.; The dimension of the anti-detachment portion 513 in the height direction is c. In other embodiments, the perforated portion 512 can extend in any direction, such as the length direction of the battery cell 1, as long as the perforated portion 512 can pass through the hole and have the effect of flattening the top cover 3.

[0075] Specifically, in this embodiment, see Figure 2 、 Figure 7-10A strip structure 6 is provided on the insulating film 4 , both ends of the strip structure 6 are fixedly connected to the insulating film 4 , and a hole is formed between the strip structure 6 and the insulating film 4 .

[0076] More specifically, one end of the strip structure 6 is connected to one side of the insulating film 4 in the length direction of the battery cell 1, and the other end of the strip structure 6 is connected to the other side of the insulating film 4 in the length direction of the battery cell 1. The length of the strip structure 6 is greater than or equal to the length of the top cover 3.

[0077] Specifically, the material of the strip structure 6 is the same as that of the insulating film 4 , and the material can be PP, PS or PI.

[0078] When the first connector 51 and the second connector 52 are mated, the perforated portion 512 passes through the hole, the lower surface of the strip structure 6 abuts the perforated portion 512, one edge of the strip structure 6 contacts the connecting portion 511, and the other edge contacts the anti-slip portion 513. This arrangement fully prevents the first connector 51 from detaching from the hole, resulting in failure to flatten the top cover 3. By fixing the two ends of the strip structure 6 to the two ends of the insulating film 4 in the length direction of the battery cell 1, no matter how many first connectors 51 are provided, all first connectors 51 can be used in conjunction with the strip structure 6, without having to set a corresponding hole for each first connector 51. This can simplify the structure and reduce costs. Of course, in other embodiments, a corresponding second connector 52 can also be set for each first connector 51. In this arrangement, there will be no interference between the mating structures of each group of first connectors 51 and second connectors 52. By making the length of the strip structure 6 greater than or equal to the length of the top cover 3, a margin is left to allow it to be pulled up by the first connector 51. In other embodiments, the strip structure 6 may be elastic so as to leave a margin that can be pulled up by the first connecting member 51 .

[0079] More specifically, in this embodiment, the length of the strip structure 6 is greater than the length of the top cover 3. The difference between the lengths of the strip structure 6 and the top cover 3 is a set value. Optionally, the set value is 5 mm to 8 mm. Setting the difference within this range can appropriately leave a margin that can be pulled up by the first connector 51. Whether the margin is too large or too small, the leveling effect will be affected. Exemplary values ​​can be 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, or 8 mm.

[0080] Figure 5 In the figure, e represents the distance between the first connecting member 51 and the edge of the top cover 3 along the thickness direction of the battery cell 1 ; and size f represents the size of the top cover 3 along the thickness direction of the battery cell 1 .

[0081] e<(1 / 2f)-b. This arrangement enables the first connector 51 to be located on the side of the center line of the top cover 3 without the tab 2, so that the force exerted by the strip structure 6 on the first connector 51 acts on the side of the top cover 3 without the tab 2.

[0082] For example, e is equal to the distance between the insulating member 32 and the edge of the top cover 3. The height a of the first connector 51 is consistent with the height of the folded tab 2. When the insulating film 4 is tightened, the perforated portion 512 contacts the top of the battery cell 1, making it easier to determine and control whether the top cover 3 is level.

[0083] See also Figure 5 and Figure 7 The strip structure 6 is located on the side of the battery cell 1 without the electrode ear 2 (that is, the second side in the thickness direction of the battery cell), and the distance between the side of the strip structure 6 close to the edge of the top cover 3 and the edge of the top cover 3 is g, e≤g≤(e+b). This setting can ensure that the strip structure 6 is aligned with the first connecting member 51, ensuring that the first connecting member 51 can pass through the hole.

[0084] Alternatively, in other embodiments, the hole may be formed by providing two openings spaced apart in the insulating film 4, with the perforated portion 512 passing through one of the openings and exiting through the other, thereby forming a hole between the insulating film 4 between the two openings and the remaining portion of the insulating film 4. A thin strip structure is formed between the two openings. After the perforated portion 512 passes through one opening and exits through the other, the thin strip structure is located on the upper surface of the perforated portion 512. The thin strip structure can also abut against the anti-detachment portion 513, thereby preventing the first connector 51 from detaching from the second connector 52.

[0085] Further, see Figure 8 and Figure 9 In this embodiment, the top cover 3 includes a top cover sheet 31 and an insulating member 32 stacked together. The insulating member 32 is attached to the lower surface of the top cover sheet 31. Optionally, the top cover sheet 31 is made of aluminum, and the insulating member 32 is made of plastic, which can insulate the battery cell 1 from the top cover sheet 31.

[0086] A first connector 51 is provided at each end of the lower plastic plate along the length of the top cover 3. Optionally, in other embodiments, multiple first connectors 51 may be provided at intervals along the length of the top cover 3. For example, the number of first connectors 51 may be 3, 4, 5, 6, or other numbers. The number of first connectors 51 may be selected based on the actual length of the top cover 3.

[0087] The top cover 3 is provided with a positive electrode column 33 , an explosion-proof valve 34 , a negative electrode column 35 and a liquid injection hole 36 which pass through the top cover 3 .

[0088] In this embodiment, the first connecting member 51 is disposed on the insulating member 32. Optionally, in this embodiment, the first connecting member 51 is made of an insulating material, such as PP, PS or PI.

[0089] Of course, the first connecting member 51 may also be provided on the top cover 31 , in which case the insulating member 32 needs to avoid the first connecting member 51 .

[0090] Specifically, see Figure 4 and Figure 5 In this embodiment, the insulating film 4 includes a first covering film 41 , a third covering film 43 , a fourth covering film 44 and two second covering films 42 .

[0091] The first covering film 41 covers the surface of the battery cell 1 facing the top cover 3 , and the second connecting member 52 is disposed on the first covering film 41 .

[0092] Specifically, the first coating film 41 is provided with a plurality of avoidance holes corresponding one-to-one to the positive electrode column 33 , the explosion-proof valve 34 , the negative electrode column 35 and the liquid injection hole 36 .

[0093] A second covering film 42 is provided on two opposite sides of the first covering film 41 along the thickness direction of the battery cell 1 , respectively. The two second covering films 42 cover the two largest side surfaces of the battery cell 1 one by one.

[0094] The third coating film 43 is disposed on one end of the second coating film 42 away from the first coating film 41 .

[0095] The fourth covering film 44 is disposed on an end of the second covering film 42 away from the first covering film 41 . The third covering film 43 and the fourth covering film 44 are jointly covered on a side of the battery cell 1 away from the top cover 3 , and the two films form an overlapping area.

[0096] Optionally, in this embodiment, the insulating film 4 is a polyester film with good insulation performance.

[0097] Optionally, the thickness of the fourth coating film 44 is greater than the thickness of the third coating film 43; and / or

[0098] The third covering film 43 and the fourth covering film 44 are detachably connected.

[0099] Optionally, the thickness of the fourth covering film 44 is greater than the thickness of the third covering film 43; with this arrangement, when the battery cell 1 is covered, the third covering film 43 is arranged close to the lower surface of the battery cell 1, and the fourth covering film 44 is located on the lower side of the third covering film 43. The fourth covering film 44 can serve as a bottom support plate structure, so the existing bottom support plate structure can be eliminated and the structural parts inside the battery can be reduced.

[0100] Further optionally, the thickness of the third coating film 43 is 0.05 mm to 0.2 mm, and for example, it can be 0.05 mm, 0.1 mm, 0.15 mm or 0.2 mm. The thickness of the fourth coating film 44 is 0.2 mm to 0.4 mm, and for example, it can be 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm or 0.4 mm.

[0101] Optionally, the third covering film 43 and the fourth covering film 44 are detachably connected, for example, by a snap fastener. This arrangement facilitates adjustment of the fit between the first connecting member 51 and the second connecting member 52. During the process of covering the insulating film 4, the top cover 3 is adjusted to a horizontal position by aligning the second connecting member 52 on the insulating film 4 with the first connecting member 51 on the top cover 3. The third covering film 43 and the fourth covering film 44 are then fixed, and the entire process can be repeated.

[0102] For example, see Figure 7 The third covering film 43 is provided with a first snap 431, and the fourth covering film 44 is provided with a second snap 441 that is snap-fitted with the first snap 431. The third covering film 43 and the fourth covering film 44 are detachably connected by the first snap 431 and the second snap 441. Furthermore, the number of the first snap 431 is at least one, and the number of the second snap 441 is at least one. The second snap 441 is arranged in a one-to-one correspondence with the first snap 431, and the first snap 431 and the second snap 441 can be arranged in an array. Specifically, in this embodiment, six rows of first snaps 431 are arranged at intervals along the width direction of the third covering film 43, and three first snaps 431 are arranged at intervals in each row to ensure a stable connection between the third covering film 43 and the fourth covering film 44. Of course, in other embodiments, the number of the first snap 431 and the second snap 441 can also be other, as long as the number of the two is the same, and no further restrictions are made here.

[0103] Specifically, in this embodiment, the thickness of the fourth covering film 44 is greater than the thickness of the third covering film 43 ; and the third covering film 43 and the fourth covering film 44 are detachably connected.

[0104] Furthermore, in this embodiment, the connection between the first connecting member 51 and the second connecting member 52 has a certain degree of freedom, so as to facilitate adjustment of the tilt angle of the top cover 3 in the process of pulling down the insulating film 4 when covering the insulating film 4 .

[0105] More specifically, in order to allow the connection between the first connecting member 51 and the second connecting member 52 to have a certain degree of freedom, the width of the strip structure 6 is smaller than the length of the perforated portion 512 (the length of the perforated portion 512 is the distance between the connecting portion 511 and the anti-detachment portion 513, that is, Figure 4Dimension b shown in FIG). With this arrangement, when the insulating film 4 is pulled down, the strip structure 6 can move on the perforated portion 512, flexibly adjusting the tightening degree of the insulating film 4 and thus the tilt degree of the top cover 3 to ensure that the top cover 3 can be leveled.

[0106] If the connection between the first connecting member 51 and the second connecting member 52 does not have freedom, the tightening degree of the insulating film 4 is equivalent to being fixed in advance and cannot be adjusted. In the process of wrapping the insulating film 4 and tightening the fourth wrapping film 44, if the insulating film 4 is pulled too tight, the connection between the first connecting member 51 and the top cover 3 may be broken; if the insulating film 4 is relatively loose, the top cover 3 may not be able to be leveled.

[0107] Exemplarily, when making a battery, the insulating film 4 is spread on the top of the battery cell 1, and the first coating film 41 is arranged facing the upper surface of the battery cell 1, the tab 2 is arranged through the first coating film 41, the third coating film 43 is attached to the bottom surface of the battery cell 1, and the second coating film 42 is attached to a large surface of the battery cell 1; then the top cover 3 is welded to the tab 2, the first connecting member 51 is connected to the second connecting member 52, and then the fourth coating film 44 is continued to be pulled down. In the process of pulling down the fourth coating film 44, the first coating film 41 pulls down the first connecting member 51, thereby leveling the top cover 3; continue to pull the fourth coating film 44 so that another second coating film 42 is attached to another large surface of the battery cell 1, and the fourth coating film 44 is attached to the lower surface of the third coating film 43, and the third coating film 43 and the fourth coating film 44 are connected by the first clip 431 and the second clip 441. Finally, the battery cell 1 and the top cover 3 that are welded together are installed in the housing, and the welding process of the top cover 3 and the housing is carried out.

[0108] It should be noted that, in this embodiment, the electrode tab 2 and the top cover 3 are welded, and the electrode tab 2 can be directly welded to the electrode post, or the electrode tab can be welded to the electrode post through an adapter.

[0109] The third covering film 43 and the fourth covering film 44 are connected by the first snap 431 and the second snap 441, so that the position of the insulating film 4 is fixed, and the position of the top cover 3 is fixed by the top cover flattening matching structure. In the actual production process, due to the influence of manufacturing errors, the degree of inclination of the top cover 3 of each battery is different, so the adjustment range of the top cover 3 of each battery is also different. In this case, through the multi-row snap design, the first snap 431 and the second snap 441 can be fixed in the appropriate position according to the actual inclination of each top cover 3, leaving a margin for the cooperation between the first connector 51 and the second connector 52, ensuring that the top cover 3 of each battery can be flattened.

[0110] Specifically, in this embodiment, the width h1 of the third covering film 43 is smaller than the width h2 of the fourth covering film 44. With this arrangement, when the fourth covering film 44 is fastened to the third covering film 43, the third covering film 43 does not extend beyond the fourth covering film 44, allowing both the third covering film 43 and the fourth covering film 44 to be flattened, thereby improving the flatness of the insulating film 4.

[0111] Example 2

[0112] This embodiment provides an electrical device, which includes the battery of the first embodiment.

[0113] The power-consuming device provided in this embodiment is powered by the battery of the first embodiment.

[0114] With the above-mentioned battery, the top cover 3 of the battery is in a state parallel to the upper surface of the battery cell 1 after being installed in place, thereby ensuring the welding quality between the top cover 3 and the shell.

[0115] When assembling the above-mentioned battery,

[0116] The battery cell 1 is installed in the shell, and the first connector 51 and the second connector 52 of the top cover flattening matching structure are connected and matched with each other. Since the tab 2 is arranged on the first side of the battery cell 1 along its own thickness direction, the end of the tab 2 away from the battery cell 1 is bent toward the second side of the battery cell 1 along its own thickness direction, so the tab 2 has an upward supporting force on the second side of the top cover 3 along the battery cell thickness direction. Under the action of the tab 2, the second side of the top cover 3 along the battery cell thickness direction will be tilted upward; however, since the top cover flattening matching structure is arranged on the second side of the battery cell 1 along its own thickness direction, under the action of the top cover flattening matching structure, the second connector 52 pulls the second side of the top cover 3 downward toward the battery cell 1 through the first connector 51, thereby being able to pull down the tilted top cover 3. Under the action of the top cover flattening matching structure, the top cover 3 is flattened, so that the top cover 3 is in a state parallel to the upper surface of the battery cell 1, ensuring the welding quality between the top cover 3 and the shell.

[0117] Specifically, electrical devices include but are not limited to: mobile phones, portable devices, laptops, electric vehicles, ships, spacecraft, electric toys and electric tools, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers.

[0118] Obviously, the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions are possible for those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

[0119] Note that throughout this specification, references to terms such as "some embodiments" and "other embodiments" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. Throughout this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Claims

1. A battery, characterized in that include: case; A battery cell (1) is accommodated in the housing, and a tab (2) is provided on the battery cell (1), wherein the tab (2) is arranged on a first side of the battery cell (1) along its own thickness direction, and an end of the tab (2) away from the battery cell (1) is bent toward a second side of the battery cell (1) along its own thickness direction; A top cover (3) is fastened to the open end of the shell and is arranged on the side of the battery cell (1) where the tab (2) is arranged, and the end of the tab (2) away from the battery cell (1) is connected to the top cover (3); An insulating film (4) is provided covering the surface of the battery core (1); A top cover flattening matching structure comprises a first connecting member (51) and a second connecting member (52), wherein the first connecting member (51) is arranged on the top cover (3), and the second connecting member (52) is arranged on the insulating film (4), the first connecting member (51) and the second connecting member (52) are connected and matched with each other, and the top cover flattening matching structure is arranged on the second side of the battery cell (1) along its own thickness direction.

2. The battery according to claim 1, characterized in that One of the first connecting member (51) and the second connecting member (52) is a hook-shaped structure, and the other is a hole. The hook-shaped structure includes a connecting portion (511) and a perforated portion (512). The perforated portion (512) is connected to one end of the connecting portion (511) and passes through the hole.

3. The battery according to claim 2, characterized in that The first connecting member (51) is a hook-shaped structure, the second connecting member (52) is a hole, one end of the connecting portion (511) is connected to the top cover (3), the perforated portion (512) is arranged at the other end of the connecting portion (511), and the hole is arranged in the insulating film (4).

4. The battery according to claim 3, characterized in that The hook-shaped structure further comprises an anti-slip portion (513), wherein the anti-slip portion (513) is arranged at an end of the perforated portion (512) away from the connecting portion (511), and the anti-slip portion (513) extends toward the top cover (3).

5. The battery according to claim 3, characterized in that A strip structure (6) is provided on the insulating film (4), two ends of the strip structure (6) are fixedly connected to the insulating film (4), and the hole is formed between the strip structure (6) and the insulating film (4).

6. The battery according to claim 5, characterized in that One end of the strip structure (6) is connected to one side of the insulating film (4) in the length direction of the battery cell (1), and the other end of the strip structure (6) is connected to the other side of the insulating film (4) in the length direction of the battery cell (1). The length of the strip structure (6) is greater than or equal to the length of the top cover (3).

7. The battery according to claim 3, characterized in that Two openings are spaced apart on the insulating film (4); the perforated portion (512) passes through one of the openings and passes through the other opening; the hole is formed between the insulating film (4) between the two openings and the remaining portion of the insulating film (4).

8. The battery according to any one of claims 1 to 7, characterized in that: The insulating film (4) comprises: a first covering film (41), the first covering film (41) covering the surface of the battery core (1) facing the top cover (3), and the second connecting member (52) being arranged on the first covering film (41); Two second covering films (42), one second covering film (42) is respectively provided on opposite sides of the first covering film (41) along the thickness direction of the battery core (1), and the two second covering films (42) cover the two largest side surfaces of the battery core (1) one by one; a third covering film (43) disposed on one end of the second covering film (42) away from the first covering film (41); A fourth covering film (44) is provided on an end of the other second covering film (42) away from the first covering film (41), and the third covering film (43) and the fourth covering film (44) are jointly covered on a side of the battery cell (1) away from the top cover (3), and the two form an overlapping area.

9. The battery according to claim 8, characterized in that The thickness of the fourth coating film (44) is greater than the thickness of the third coating film (43); and / or The third covering film (43) and the fourth covering film (44) are detachably connected.

10. An electrical device, characterized in that: The invention comprises a battery according to any one of claims 1 to 9.

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