Battery

Abstract

The utility model relates to a battery and relates to the technical field of batteries. The battery provided by the utility model comprises an insulating film, the insulating film is used for wrapping a roll core, the insulating film is provided with a convex part, the convex part is transversely arranged relative to a pole lug of the roll core, and the convex part faces the pole lug and is attached to the pole lug. The lug is arranged on the insulating film, and the lug forms a shaping support frame and a shaping and folding lug, so that the stability of the lug is improved, the bending and shaping effects on the lug are better, and the technical problem of short circuit failure caused by the reason that the outermost layer of the lug part tilts and is not attached in the prior art is solved; moreover, in the manufacturing process of the battery core, the tab is convenient to shape and fold, the process of adjusting the bending state of the tab of the roll core by manpower or a tool can be reduced, the cost is reduced, and the resource waste is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the battery technical field, specifically, relate to a battery. BACKGROUND

[0002] Lithium ion battery needs to pass through Mylar film cladding battery roll core procedure in production, and Mylar film is an insulating film. Mylar film is an integral sheet, needs to be bent and is pressed tightly to adapt to the profile shape of roll core according to the profile shape of roll core, and then the formed Mylar film is hot melt with the lower plastic of the battery core, finally, the glue is fixed.

[0003] The inventor found that after laser welding, the copper aluminum foil of the outermost layer of the tab is not attached to the whole tab when the tab is in a bent state; because the texture of Mylar film is soft, if there are metal chips to pierce the Mylar film, the whole battery core will have a risk of short circuit, and thus the whole battery core will be disabled. UTILITY MODEL CONTENT

[0004] The utility model discloses a battery, the protruding part of the insulating film can converge the tab of the roll core, and the tab of the roll core can be adjusted in a bent state.

[0005] The embodiment of the utility model can be realized as follows:

[0006] The utility model discloses a battery, comprising: an insulating film, the insulating film is used to wrap a roll core, the insulating film is equipped with a protruding part, the protruding part is horizontally arranged relative to the tab of the roll core, and the protruding part protrudes towards the tab and is attached to the tab.

[0007] Optionally, the insulating film is bent in the horizontal direction to form the protruding part.

[0008] Optionally, the protruding part comprises an upper bent side wall and a lower bent side wall connected, and the upper bent side wall and the lower bent side wall are arranged at an angle.

[0009] Optionally, the angle of the angle is 35°-45°.

[0010] Optionally, the width of the upper bent side wall is 1-2mm.

[0011] The width of the lower bent side wall is 1-2mm.

[0012] Optionally, the profile after cutting wraps the roll core to form the insulating film.

[0013] The profile comprises a first sheet body and two second sheet bodies connected, and the two second sheet bodies are located on the two sides of the first sheet body, and the protruding part is formed by bending the second sheet body in the horizontal direction.

[0014] Optionally, the first side wall of the winding core and the second side wall of the winding core are oppositely arranged.

[0015] The first sheet wraps the bottom wall of the winding core, and the two second sheets are provided with a first area, the first area wraps the first side wall of the winding core or the second side wall of the winding core, and the first area forms the protruding part.

[0016] Optionally, the first area is provided with at least three creases, the at least three creases are transversely arranged and spaced, and the protruding part is formed by bending along the at least three creases.

[0017] Optionally, the second sheet is pre-folded to form the at least three creases.

[0018] Optionally, the battery further comprises a top cover structure connected with the winding core, and the insulating film wraps the winding core and is connected with the top cover structure.

[0019] Wherein, the edge of the insulating film is provided with a plurality of hot melting points, and the insulating film is hot melt connected with the top cover structure along the hot melting points.

[0020] The beneficial effects of the battery provided by the embodiment of the utility model include:

[0021] By setting the protruding part on the insulating film, the protruding part forms a shaping support frame, the tab is shaped and folded, the stability of the tab is improved, the tab folding and shaping effect is better, and the technical problem of short circuit failure caused by the reason that the outermost layer of the tab part is raised and not attached in the prior art is solved. And in the process of manufacturing the battery cell, the tab is shaped and folded, the process of adjusting the folding state of the tab of the winding core by artificial or tooling is reduced, the cost is reduced, and the resource waste is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment, it should be understood that the following drawings only show some embodiments of the utility model, therefore should not be regarded as the limitation to the scope, for the ordinary skilled person in the art, under the premise of not paying the creative labor, other related drawings can also be obtained according to these drawings.

[0023] Figure 1 The structure diagram of the bare battery cell of the battery provided by the embodiment is shown.

[0024] Figure 2 The sectional view of the bare battery cell of the battery provided by the embodiment is shown.

[0025] Figure 3 isFigure 2 Partial view of the insulating film of the present embodiment;

[0026] Figure 4 Partial view of the insulating film of the present embodiment;

[0027] Figure 5 Structure diagram of the profile of the insulating film of the present embodiment;

[0028] Figure 6 Structure diagram of the insulating film of the present embodiment.

[0029] Icon: 010-battery; 100-insulating film; 110-protruding part; 111-upper bent sidewall; 112-lower bent sidewall; 120-profile; 121-first piece; 122-second piece; 1221-first area; 1222-second area; 1223-fold line; 130-hot melting point; 200-winding core; 210-tab; 300-top cover structure; 310-pole assembly; 320-lower plastic. DETAILED DESCRIPTION

[0030] The inventor found that after laser welding, the tab is in a bent state, and the outermost copper-aluminum foil of the tab does not fit the entire tab. Since the mylar film is soft, if metal debris pierces the mylar film, foreign matter will pierce into the inside of the winding core, causing the diaphragm to be pierced, the entire battery cell will have a short circuit risk, and the entire battery cell will be disabled, resulting in a loss of yield and a huge waste of cost.

[0031] At the same time, in the process of wrapping the winding core 200 with the insulating film 100, in order to ensure that the insulating film 100 completely wraps the winding core 200, the edge of the insulating film 100 is usually hot-melted close to the edge of the lower plastic 320 during positioning. Since the mylar film is soft, position deviation is prone to occur during positioning.

[0032] To solve the above problems, the utility model provides a battery 010, the protruding part 110 of the insulating film 100 can converge the tab 210 of the winding core 200, and the tab 210 of the winding core 200 can be adjusted in a bent state, so that the above problems can be improved.

[0033] To make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all the embodiments. The components of the embodiments of the utility model described and shown in the drawings can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative labor belong to the scope of protection of the utility model.

[0035] It should be noted that: similar signs and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0036] In the description of the utility model, it should be explained that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the utility model product is used, only for the convenience of describing the utility model and simplifying the description, and it is not indicated or implied that the indicated device or element must have a specific orientation, structure and operation, therefore, it cannot be understood as a limitation on the utility model.

[0037] In addition, if the terms "first", "second" and the like appear, they are only used for differentiation description, and cannot be understood as indicating or implying relative importance.

[0038] It should be noted that the features in the embodiments of the utility model can be combined with each other without conflict.

[0039] The overall structure, working principle and technical effects of the battery 010 provided by the utility model are described in detail below through embodiments and in conjunction with the drawings.

[0040] Please refer to Figure 1 The battery 010 provided by the utility model is applied to a square lithium ion battery.

[0041] Please refer to Figure 1 and Figure 2 The battery 010 provided by the utility model comprises an insulating film 100, the insulating film 100 is used for wrapping a roll core 200, the insulating film 100 is provided with a protruding part 110, the protruding part 110 is horizontally arranged relative to a tab 210 of the roll core 200, the protruding part 110 faces the tab 210 and is attached to the tab 210.

[0042] It can be understood that the top end of the winding formed core 200 extends out the tab 210, the insulating film 100 is provided with the protruding part 110 transversely relative to the tab 210 of the core 200, and the protrusion of the protruding part 110 is arranged towards the tab 210 and adheres to the tab 210. Therefore, by arranging the protruding part 110 on the insulating film 100, the protruding part 110 forms a shaping support frame, shapes and folds the tab 210, improves the stability of the tab 210, and has a good effect on the folding and shaping of the tab 210. The technical problem of short circuit failure caused by the outermost layer of the tab 210 not adhering in the prior art is solved. Moreover, in the process of manufacturing the battery cell, the tab 210 of the core 200 is conveniently shaped and folded, the process of adjusting the folding state of the tab 210 by manual or tooling is reduced, the cost is reduced, and the waste of resources is reduced.

[0043] In the embodiment, the battery 010 includes the core 200.

[0044] In the embodiment, the positive electrode sheet, the diaphragm and the negative electrode sheet are stacked and wound to form the core 200. Please refer to Figure 2 The top of the core 200 forms two tabs 210, and the two tabs 210 are transversely and spaced apart along the top of the core 200. One of the two tabs 210 is a positive tab 210, and the other is a negative tab 210. Further, after the core 200 is wound and formed, it is pre-pressed and shaped by hot pressing or cold pressing, and the core 200 is shaped into a rectangular block structure.

[0045] The core 200 includes first and second side walls arranged opposite to each other and third and fourth side walls arranged opposite to each other. The first and second side walls are transversely parallel and longer side walls of the core 200, and the third and fourth side walls are vertically arranged and shorter side walls of the core 200.

[0046] In the embodiment, the battery 010 includes the insulating film 100.

[0047] The insulating film 100 is used to wrap the core 200 to avoid contact between the core 200 and the inside of the shell.

[0048] In the embodiment, please refer to Figure 2 and Figure 3 The insulating film 100 is provided with the protruding part 110, which is transversely arranged relative to the tab 210 of the core 200, and the protruding part 110 protrudes towards the tab 210 and adheres to the tab 210.

[0049] The protruding part 110 forms a shaping support frame, and the tab 210 is shaped and folded inwards to avoid the outermost copper-aluminum foil of the tab 210 from not adhering to the entire tab 210.

[0050] Optionally, the protruding part 110 can be an arc-shaped protruding structure, a rectangular protruding structure or a triangular protruding structure.

[0051] In the embodiment, referring to Figure 3 and Figure 4 , the insulating film 100 is folded along the transverse direction to form the protruding part 110 in a triangular protruding structure. The protruding part 110 includes the connected upper folded side wall 111 and lower folded side wall 112, and the upper folded side wall 111 and the lower folded side wall 112 are arranged at an included angle.

[0052] In the embodiment, referring to and

[0053] , the upper folded side wall 111 is folded downward along the fold 1223 of the insulating film 100, and the lower folded side wall 112 is folded upward along the fold 1223 of the insulating film 100, so that the upper folded side wall 111 and the lower folded side wall 112 form an included angle, and the protruding part 110 is formed by folding. Figure 4 Optionally, referring to

[0054] , the angle of the included angle A formed by the folding of the upper folded side wall 111 and the lower folded side wall 112 is 35°-45°. For example, 35°, 36°, 37°…44°, 45°, etc. Figure 4 Optionally, referring to

[0055] , the width L1 of the upper folded side wall 111 is 1-2 mm. For example, 1 mm, 1.1 mm…1.8 mm, 1.9 mm, 2 mm, etc. Figure 4 Optionally, referring to

[0056] , the width L2 of the lower folded side wall 112 is 1-2 mm. For example, 1 mm, 1.1 mm…1.8 mm, 1.9 mm, 2 mm, etc. Figure 5 Figure 6 In the embodiment, referring to and

[0057] , the cut profile 120 is wrapped around the core 200 to form the insulating film 100. Figure 5 In the embodiment, referring to

[0058] , the profile 120 includes the first piece 121 and two second pieces 122, and the two second pieces 122 are located on the two sides of the first piece 121, and the protruding part 110 is formed by folding the second piece 122 in the transverse direction.

[0059] In the embodiment, referring to Figure 5two second pieces 122 cooperatively wrap the four side walls of the core 200; the two second pieces 122 are provided with a first region 1221 and a second region 1222, and the two sides of the first region 1221 are provided with the second region 1222; the first region 1221 wraps the first side wall of the core 200 or the second side wall of the core 200, and the first region 1221 forms the protruding part 110; the second region 1222 wraps the third side wall of the core 200 or the fourth side wall of the core 200.

[0060] It can be understood that the first piece 121 wraps the bottom wall of the core 200; then, the two second pieces 122 are bent, and the first region 1221 of one of the two second pieces 122 wraps the first side wall of the core 200, and the second region 1222 of the two second pieces 122 is bent to wrap the third side wall and the fourth side wall of the core 200. Finally, the first region 1221 of the other second piece 122 corresponds to wrap the second side wall, and the second region 1222 of the two second pieces 122 is bent to wrap the third side wall and the fourth side wall of the core 200. In this way, the profile 120 wraps the core 200 to form the insulation film 100.

[0061] In the embodiment, please refer to Figure 5 The first region 1221 is provided with at least three creases 1223, and the at least three creases 1223 are transversely arranged and spaced apart, and the protruding part 110 is formed by bending along the at least three creases 1223.

[0062] The creases 1223 are formed by pre-folding the second piece 122.

[0063] It can be understood that please refer to Figure 5 and Figure 6 The creases 1223 are pre-folded and bent to form the protruding part 110, and the tab 210 is shaped and gathered by the protruding part 110. Moreover, compared with the current shaping method of the tab 210, the shaping and gathering method of the tab 210 by the protruding part 110 can reduce the process of adjusting the bending state of the tab 210 of the core 200 by manual or tooling in the manufacturing process of the battery cell, reduce the cost, and reduce the waste of resources.

[0064] In the embodiment, the protruding part 110 is a triangular protruding structure, and the creases 1223 need to be at least three; of course, in other embodiments, the protruding part 110 is a rectangular protruding structure, and the creases 1223 can be four.

[0065] The creases 1223 are arranged at intervals, and the sheet body after being bent along the creases 1223 can form the upper bent side wall 111 and the lower bent side wall 112. Meanwhile, the distance between the creases 1223 determines the angle of the upper bent side wall 111 and the lower bent side wall 112 bent to form an included angle, so that the interval distance between the creases 1223 can be selected according to actual requirements.

[0066] Optionally, the interval distance between the two creases 1223 is 1-2 mm, and the interval distance can be 1 mm, 1.1 mm, 1.8 mm, 1.9 mm, 2 mm, etc.

[0067] It can be understood that after the profile 120 is bent to wrap the core 200 to form the insulation film 100, the convex part 110 is bent along the crease 1223. The end of the insulation film 100 wrapping the core is hot-melt connected with the lower plastic 320 of the top cover structure 300 to form a bare core, and after the bare core is put into the shell, the convex part 110 can play a role of shaping and folding the tab 210 under the constraint of the inner wall of the shell, so that the tab 210 reaches an ideal state.

[0068] Optionally, the insulation film 100 can be selected from plastic film type insulation films 100, such as PET polyester film insulation sheet, PP insulation sheet, PC insulation sheet and pvc insulation sheet, etc. Of course, the insulation sheet can also be selected from insulation paper type insulation sheets.

[0069] Optionally, the thickness of the insulation film 100 is 0.1-0.5 mm.

[0070] In the embodiment, the battery 010 further includes a top cover structure 300.

[0071] In the embodiment, please refer to Figure 2 The pole assembly 310 of the top cover structure 300 is connected with the tab 210 of the core 200, and the insulation film 100 wraps the core 200 and is connected with the lower plastic 320 of the top cover structure 300.

[0072] The edge of the insulation film 100 is provided with a plurality of hot-melt points 130, and the insulation film 100 is hot-melt connected with the lower plastic 320 of the top cover structure 300 along the hot-melt points 130.

[0073] In the embodiment, the battery 010 further includes a shell.

[0074] After the core 200 wrapped by the insulation film 100 is connected with the top cover structure 300 to form a bare core, the bare core is put into the shell, and the cover plate of the top cover structure 300 is welded with the shell to form the battery 010.

[0075] The manufacturing process and technology of the battery 010 provided by the embodiment of the utility model are as follows:

[0076] Taking the protruding part 110 of the triangular protruding structure as an example, the profile 120 of the insulating film 100 is pre-folded to form three creases 1223. The profile 120 is bent relative to the winding core 200 and wrapped around the winding core 200 to form the insulating film 100, the protruding part 110 is bent along the crease 1223, the protruding part 110 forms a shaping support frame, and the tab 210 is inwardly attached to shape and fold the tab 210.

[0077] The bare battery core is connected to the lower plastic 320 of the top cover structure 300 along the hot melting point 130 and is formed.

[0078] After the bare battery core is put into the shell, the cover plate of the top cover structure 300 is welded with the shell to form the battery 010. Under the constraint of the inner wall of the shell, the protruding part 110 of the insulating film 100 can shape and fold the tab 210, so that the tab 210 reaches the ideal state.

[0079] In summary, the battery 010 provided by the embodiment of the utility model, by setting the protruding part 110 on the insulating film 100, the protruding part 110 forms a shaping support frame, shapes and folds the tab 210, improves the stability of the tab 210, and at the same time, the tab 210 is better in the effect of bending and shaping, solves the technical problem of short circuit failure caused by the reason that the outermost layer of the tab 210 part is raised and not attached in the prior art, and in the process of manufacturing the battery core, the tab 210 is conveniently shaped and folded, the process of adjusting the bending state of the tab 210 of the winding core 200 by artificial or tooling can be reduced, the cost is reduced, and resource waste is reduced.

[0080] The above is only a specific implementation manner of the utility model, but the protection scope of the utility model is not limited to this, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. A battery, characterized by, The application relates to a battery, which comprises: an insulation film for wrapping a winding core, the insulation film being provided with a protruding part which is arranged transversely to a tab of the winding core, the protruding part being protruded towards the tab and being in close contact with the tab.

2. The battery of claim 1, wherein, The insulation film is bent along the transverse direction to form the protruding part.

3. The battery of claim 2, wherein, The protruding part comprises an upper bent side wall and a lower bent side wall which are connected and arranged at an angle.

4. The battery of claim 3, wherein, The angle of the angle is 35-45 degrees.

5. The battery of claim 3, wherein, The width of the upper bent side wall is 1-2 mm. The width of the lower bent side wall is 1-2 mm.

6. The battery of claim 1, wherein, The profile after cutting is used to wrap the winding core to form the insulation film. The profile comprises a first piece and two second pieces which are arranged on both sides of the first piece, and the two second pieces are bent along the transverse direction to form the protruding part.

7. The battery of claim 6, wherein, A first side wall of the winding core and a second side wall of the winding core are arranged oppositely. The first piece is used to wrap a bottom wall of the winding core, and the two second pieces are provided with a first area which is used to wrap the first side wall or the second side wall of the winding core, and the first area forms the protruding part.

8. The battery of claim 7, wherein, The first area is provided with at least three creases which are arranged transversely and are arranged at intervals, and the protruding part is formed by bending along the at least three creases.

9. The battery of claim 8, wherein, The second piece is pre-folded to form the at least three creases.

10. The battery of claim 1, wherein, The battery further comprises a top cover structure which is connected with the winding core, and the insulation film is used to wrap the winding core and is connected with the top cover structure. The edge of the insulation film is provided with a plurality of hot melting points, and the insulation film is hot melt connected with the top cover structure along the hot melting points.

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