Battery

Abstract

The utility model relates to a battery and relates to the field of energy storage batteries. The utility model provides a battery. The battery comprises a battery cell, a shell and at least two swelling pieces, corner parts are formed on the bottom wall and the side wall of the battery cell; the battery cell is accommodated in the shell; the at least two swelling parts are oppositely arranged and attached between the corner part and the inner wall of the shell, and the at least two swelling parts are used for isolating the bottom wall of the battery cell from the bottom wall of the shell after being expanded in the electrolyte. According to the battery, by arranging the swelling parts which are arranged between the corner part of the battery cell and the inner wall of the shell in an attached manner, after the battery cell enters the shell and the electrolyte is injected, the sizes of the swelling parts are expanded and increased in the thickness direction after the swelling parts are soaked in the electrolyte, and the at least two swelling parts which are oppositely arranged after swelling synchronously jack up the battery cell, so that the battery cell is prevented from being damaged. Isolation and insulation between the battery cell and the shell are realized, so that a bottom supporting plate in the prior art is replaced; therefore, the number of mechanical parts is reduced, mechanical part installation procedures are reduced, and meanwhile the requirement of the battery cell for the shell space is reduced.

Description

Technical Field

[0001] The utility model relates to the field of energy storage batteries, and in particular to a battery. Background Art

[0002] At present, in square aluminum shell lithium-ion battery products, a bottom support plate is generally used as a part of its structural parts. The bottom support plate is located between the bottom of the battery cell and the aluminum shell to insulate the battery cell and the aluminum shell and allow the electrolyte to fully infiltrate.

[0003] The inventors have found that the battery cell composed of a bare battery cell, a bare battery cell insulation sheet and a bottom support plate has a large space requirement in terms of height. At the same time, the processing procedures of this type of battery cell require hot-melting the bare battery cell insulation sheet and the bottom support plate, hot-melting the bare battery cell insulation sheet, and gluing the bare battery cell insulation sheet corners before putting the bare battery cell into the shell. The processing procedures are numerous and complicated. Utility Model Content

[0004] The utility model aims to provide a battery, which can realize isolation and insulation between a battery core and a shell.

[0005] The embodiment of the utility model is achieved as follows:

[0006] The utility model provides a battery, comprising a battery cell, a shell and at least two swelling parts; the bottom wall and the side wall of the battery cell are formed with a corner portion; the battery cell is accommodated in the shell; at least two swelling parts are arranged opposite to each other and are closely arranged between the corner portion and the inner wall of the shell, and the at least two swelling parts are used to isolate the bottom wall of the battery cell and the bottom wall of the shell after expanding in an electrolyte.

[0007] Optionally, the battery core includes an insulating sheet, and the insulating sheet is wrapped around the outside of the battery core.

[0008] Optionally, the swelling component includes a first fitting end and a second fitting end connected to each other, the first fitting end is fitted between the bottom wall of the battery cell and the inner bottom wall of the shell, and the second fitting end is fitted between the side wall of the battery cell and the inner side wall of the shell.

[0009] Optionally, the length of the first fitting end is greater than or equal to 1 / 3 of the bottom length of the insulating sheet.

[0010] Optionally, the width of the first fitting end is less than or equal to the bottom width of the insulating sheet.

[0011] Optionally, the sum of the areas of at least two oppositely disposed first bonding ends is greater than or equal to 1 / 3 of the bottom area of ​​the insulation sheet.

[0012] Optionally, the width of the swelling member is greater than or equal to 4 / 5 of the width of the insulating sheet.

[0013] Optionally, the thickness of the swelling component after swelling is greater than or equal to 0.6 mm.

[0014] Optionally, the original rubber thickness of the swelling component before swelling is: the original rubber thickness=0.6 mm / expansion ratio of the swelling component.

[0015] Optionally, the swelling member at least includes a swelling tape.

[0016] The beneficial effects of the embodiments of the utility model are:

[0017] The battery is provided with a swelling piece that is fitted between the corner of the battery cell and the inner wall of the shell, so that after the battery cell is placed in the shell and the electrolyte is injected, the swelling piece will expand in the thickness direction after being soaked in the electrolyte, and at least two swelling pieces that are relatively arranged after swelling will synchronously lift the battery cell to achieve isolation and insulation between the battery cell and the shell, thereby replacing the bottom support plate in the prior art; thereby reducing the number of mechanical parts, reducing the mechanical parts installation process, and reducing the battery cell's demand for shell space. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the structure of a battery according to an embodiment of the utility model;

[0020] Figure 2 An exploded view of a battery according to an embodiment of the utility model;

[0021] Figure 3 It is a schematic diagram of an insulating sheet and a swelling member according to an embodiment of the utility model;

[0022] Figure 4 It is a schematic diagram of an insulating sheet according to an embodiment of the utility model;

[0023] Figure 5 This is a schematic diagram of the structure of the top cover and the battery cell of an embodiment of the utility model;

[0024] Figure 6 This is a schematic diagram of a swelling member being provided on a battery cell according to an embodiment of the utility model;

[0025] Figure 7It is a partial schematic diagram of a swelling member provided on a battery cell according to an embodiment of the utility model.

[0026] Icons: 010-battery; 100-battery cell; 101-first side wall; 102-second side wall; 103-corner; 110-battery cell body; 120-insulating sheet; 121-first sheet; 122-second sheet; 200-top cover; 210-hot melt position; 300-swelling part; 310-first fitting end; 320-second fitting end; 400-shell. DETAILED DESCRIPTION

[0027] In order 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 clearly and completely described below in conjunction 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 of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0028] 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 present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] 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, further definition and explanation thereof is not required in subsequent drawings.

[0030] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does 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.

[0031] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0032] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] At present, in square aluminum shell lithium-ion battery products, a bottom support plate is generally used as a part of its structural parts. The bottom support plate is located between the bottom of the battery cell and the aluminum shell to insulate the battery cell and the aluminum shell and allow the electrolyte to fully infiltrate.

[0034] Among them, this type of battery cell is composed of a bare battery cell, bare battery cell insulation, a bottom support plate and corner glue, and its space requirement in height dimension is relatively large. And the processing procedures of traditional batteries are as follows: 1. Hot pressing of bare battery cells; 2. Engraving of top cover; 3. Ultrasonic welding of JR (Jellyroll, bare battery cell) and adapter; 4. Gluing after ultrasonic welding; 5. Laser welding of adapter and top cover; 6. Folding of pole ear shape; 7. JR (Jellyroll, bare battery cell) bundling and gluing; 8. Hot melting of Mylar (PET polyester film) and bottom support plate; 9. Wrapping bare battery cells with Mylar (PET polyester film), and hot melting the lower plastic and Mylar of the top cover; 10. Pasting blue glue at the corners of bare battery cells; 11. Putting fake battery cells into shells; 12. Pre-welding and welding of top cover and shell; 13. Inserting chemical forming nails and sealing nails; 14. Welding aluminum sealing nails; 15. Wrapping the battery with blue film as a whole.

[0035] Please refer to Figure 1-Figure 2 This embodiment provides a battery 010, which eliminates the original bottom support plate structure and the original Mylar and bottom support plate hot-melt process, reduces the number of mechanical parts, reduces the mechanical parts installation process, and reduces the space requirement of the bare battery cell 100.

[0036] Optionally, the battery 010 in this embodiment may be a square lithium-ion battery.

[0037] Please refer to Figure 1-Figure 2 A battery 010 provided in this embodiment includes a battery cell 100, a shell 400 and at least two swelling parts 300; the bottom wall and the side wall of the battery cell 100 are formed with a corner portion 103; the battery cell 100 is accommodated in the shell 400; the at least two swelling parts 300 are arranged opposite to each other and are arranged in a close relationship between the corner portion 103 and the inner wall of the shell 400, and the at least two swelling parts 300 are used to isolate the bottom wall of the battery cell 100 and the bottom wall of the shell 400 after expanding in the electrolyte.

[0038] When the swelling member 300 is immersed in the electrolyte, its thickness direction will expand.

[0039] It can be understood that after the battery cell 100 is placed in the shell and the electrolyte is injected, the swelling part 300 that is fitted between the corner portion 103 of the battery cell 100 and the inner wall of the shell 400 will expand in the thickness direction after being soaked in the electrolyte. After swelling, at least two relatively arranged swelling parts 300 will synchronously lift the battery cell 100 to achieve isolation and insulation between the battery cell 100 and the shell 400, thereby replacing the bottom support plate in the prior art; thereby reducing the number of mechanical parts, reducing the mechanical parts installation process, and reducing the battery cell 100's demand for the shell 400 space.

[0040] Please refer to Figure 2-Figure 3 In this embodiment, the battery 010 includes a battery cell 100 , wherein the battery cell 100 includes a battery cell body 110 and an insulating sheet 120 .

[0041] In this embodiment, please refer to Figure 5-Figure 6 The battery cell 100 of the rectangular block structure includes a top wall, a bottom wall, a relatively wider first side wall 101 and a relatively narrow second side wall 102 , and a corner portion 103 is formed between the bottom wall and the second side wall 102 .

[0042] Of course, in other embodiments, the corner portion 103 may also be formed between the bottom wall and the first side wall 101 .

[0043] In this embodiment, please refer to Figure 2 After the battery body 110 is wound or laminated, it is pre-pressed and shaped by hot pressing or cold pressing to shape the battery 100 into a rectangular block structure. The insulating sheet 120 is used to wrap the outside of the battery 100 to isolate the battery 100 from the shell 400.

[0044] Among them, the battery cell body 110 includes a diaphragm and at least two stacked pole pieces with opposite polarities; the pole pieces with opposite polarities are respectively a positive pole piece and a negative pole piece, and the diaphragm is arranged between adjacent positive pole pieces and negative pole pieces to avoid short circuit between the positive and negative pole pieces.

[0045] Optionally, the battery cell body 110 may be a winding core. The positive electrode sheet, the separator and the negative electrode sheet are stacked and wound to form a winding structure. Of course, the battery cell body 110 may also be a laminated core. There are multiple positive electrode sheets and multiple negative electrode sheets, which are staggered and stacked in the same direction, and a separator is provided between each adjacent positive electrode sheet and negative electrode sheet to electrically insulate the positive electrode sheet from the negative electrode sheet.

[0046] In this embodiment, please refer to Figure 4 The insulating sheet 120 includes a first sheet 121 and second sheets 122 arranged on both sides of the first sheet 121; first, the first sheet 121 is wrapped around the bottom of the battery cell body 110; secondly, the second sheets 122 on both sides are bent so that the second sheets 122 wrap around the wider first sides of the battery cell body 110, thereby forming the first side wall 101 of the battery cell 100; finally, the edge of the second sheet 122 is bent so that it wraps around the narrower second sides of the battery cell body 110, thereby forming the second side wall 102 of the battery cell 100.

[0047] Optionally, the insulating sheet 120 may be a plastic film-type insulating sheet 120, such as a PET polyester film insulating sheet, a PP insulating sheet, or a PC insulating sheet; of course, the insulating sheet may also be an insulating paper-type insulating sheet.

[0048] In this embodiment, the battery 010 includes a top cover 200 .

[0049] The top of the battery cell 100 is ultrasonically welded to the adapter sheet and then glued, and then the adapter sheet is welded to the top cover 200 and then glued. Figure 5-Figure 6 After the insulating sheet 120 is wrapped around the battery cell body 110 , it is necessary to perform hot-melt treatment on the insulating sheet 120 and the hot-melt position 210 of the plastic under the top cover 200 .

[0050] In this embodiment, the battery 010 includes two swelling components 300; Figure 2-Figure 3 The two swelling members 300 are disposed between the corner portion 103 and the inner wall of the housing 400 , and the two swelling members 300 are disposed opposite to the second side wall 102 of the battery cell 100 .

[0051] In this embodiment, please refer to Figure 2-Figure 3 The swelling member 300 includes a first bonding end 310 and a second bonding end 320 connected to each other. Figure 7 , when the swelling component 300 is adhered to the corner portion 103 of the battery cell 100: wherein the first bonding end 310 is bonded between the bottom wall of the battery cell 100 and the inner bottom wall of the shell 400, that is, one side of the first bonding end 310 is bonded to the bottom wall of the battery cell 100, and the other side is bonded to the inner bottom wall of the shell 400; wherein the second bonding end 320 is bonded between the second side wall 102 of the battery cell 100 and the inner side wall of the shell 400, that is, one side of the second bonding end 320 is bonded to the second side wall 102 of the battery cell 100, and the other side is bonded to the inner side wall of the shell 400.

[0052] It is understandable that after the battery 010 is injected with electrolyte, the swelling part 300 will expand in the thickness direction after being soaked in the electrolyte for four hours. The two relatively arranged swelling parts 300 after swelling will simultaneously lift up the battery cell 100 and the insulating sheet 120, thereby achieving isolation and insulation between the battery cell 100 and the shell 400, thereby replacing the bottom support plate in the prior art.

[0053] Optionally, the length of the first bonding end 310 is greater than or equal to 1 / 3 of the bottom length of the insulation sheet 120 .

[0054] Understandably, please refer to Figure 7 One side of the first bonding end 310 is adhered to the first sheet body 121 of the insulation sheet 120 , so the length of the first bonding end 310 is greater than or equal to 1 / 3 of the length of the first sheet body 121 .

[0055] Optionally, the width of the first bonding end 310 is less than or equal to the bottom width of the insulation sheet 120 .

[0056] Understandably, please refer to Figure 7 One side of the first bonding end 310 is adhered to the first sheet body 121 of the insulation sheet 120 , so the width of the first bonding end 310 is less than or equal to the width of the first sheet body 121 .

[0057] Optionally, the sum of the areas of at least two oppositely disposed first bonding ends 310 is greater than or equal to 1 / 3 of the bottom area of ​​the insulation sheet 120 .

[0058] Understandably, please refer to Figure 7 The sum of the areas of the two first bonding ends 310 is greater than or equal to 1 / 3 of the area of ​​the first sheet body 121 .

[0059] Optionally, the width of the swelling member 300 is greater than or equal to 4 / 5 of the width of the insulating sheet 120 .

[0060] Understandably, please refer to Figure 7 , the width of the swelling member 300 is greater than or equal to 4 / 5 of the width of the first sheet body 121 .

[0061] Optionally, the thickness of the swelling member 300 after swelling is greater than or equal to 0.6 mm.

[0062] Furthermore, the original rubber thickness of the swelling member 300 before swelling is: original rubber thickness=0.6 mm / expansion ratio of the swelling member 300 .

[0063] It can be understood that when the expansion ratio of the swelling member 300 is 300%, the original adhesive thickness of the swelling member 300 is 0.6 mm / 300%, that is, the original adhesive thickness of the swelling member 300 is 0.2 mm.

[0064] In this embodiment, the swelling piece 300 is a swelling tape; the swelling tape has electrolyte resistance, so that the swelling piece 300 will not be dissolved by the electrolyte after being immersed in the electrolyte, and the swelling tape can be well adhered to the surface of the insulating sheet 120 and the inner wall of the shell 400.

[0065] In this embodiment, please refer to Figure 2 Of course, in other embodiments, there may be three swelling members 300 , two of which are disposed oppositely to the second side wall 102 of the battery cell 100 , and the third one may be disposed separately on the bottom wall of the battery cell 100 .

[0066] In this embodiment, the battery 010 includes a housing 400 .

[0067] The shell 400 is a rectangular shell 400, and a rectangular receiving groove is arranged in the shell 400; after the two swelling parts 300 are pasted on the two second side walls 102 of the battery cell 100, it is placed in the receiving groove of the outer shell to realize the insertion of the dummy battery cell 100 into the shell.

[0068] The processing steps of the battery 010 proposed in this embodiment are as follows:

[0069] 1. Pre-press and shape the battery cell 100 by hot pressing; 2. Engrave the code on the top cover 200; 3. Ultrasonic welding is performed on the battery cell 100 and the adapter; 4. Glue the battery cell 100 and the adapter after ultrasonic welding; 5. Laser welding the adapter and the top cover 200; 6. Fold out the ear shape of the battery cell 100; 7. Bundle and glue the battery cell 100; 8. Wrap the battery cell 100 with the insulating sheet 120, and glue the plastic and insulating film under the top cover 200. 10. Hot-melt the hot-melt position 210 of the sheet 120; 11. Glue two swelling parts 300 to the two corners 103 of the battery cell 100; 12. Pre-weld and weld the top cover 200 and the shell 400; 13. Inject electrolyte into the battery 010 through the injection hole of the top cover 200, and then insert the chemical nail and the sealing nail; 14. Weld the aluminum sealing nail; 15. Wrap the battery 010 with a blue film.

[0070] In summary, the battery 010 proposed in the present invention, by setting a swelling part 300 that is fitted between the corner portion 103 of the battery cell 100 and the inner wall of the shell 400, after the battery cell 100 is put into the shell and the electrolyte is injected, the swelling part 300 will expand in the thickness direction after being soaked in the electrolyte, and at least two relatively arranged swelling parts 300 after swelling will synchronously lift the battery cell 100, so as to achieve isolation and insulation between the battery cell 100 and the shell 400, thereby replacing the bottom support plate in the prior art; thereby reducing the number of mechanical parts, reducing the mechanical parts installation process, and at the same time reducing the battery cell 100 The demand for space in the shell 400 is reduced.

[0071] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A battery, characterized in that: include: A battery cell, wherein the bottom wall and the side wall of the battery cell are formed with corner portions; A shell, wherein the battery cell is accommodated in the shell; At least two swelling parts are arranged opposite to each other and closely attached between the corner part and the inner wall of the shell. After the at least two swelling parts swell in the electrolyte, they are used to isolate the bottom wall of the battery cell and the bottom wall of the shell.

2. The battery according to claim 1, characterized in that The battery core comprises an insulating sheet, and the insulating sheet is wrapped around the outside of the battery core.

3. The battery according to claim 2, characterized in that The swelling component includes a first fitting end and a second fitting end connected to each other, wherein the first fitting end is fitted between the bottom wall of the battery cell and the inner bottom wall of the shell, and the second fitting end is fitted between the side wall of the battery cell and the inner side wall of the shell.

4. The battery according to claim 3, characterized in that The length of the first bonding end is greater than or equal to 1 / 3 of the bottom length of the insulation sheet.

5. The battery according to claim 3, characterized in that The width of the first bonding end is less than or equal to the bottom width of the insulation sheet.

6. The battery according to claim 3, characterized in that The sum of the areas of at least two oppositely disposed first bonding ends is greater than or equal to 1 / 3 of the bottom area of ​​the insulating sheet.

7. The battery according to claim 2, characterized in that The width of the swelling member is greater than or equal to 4 / 5 of the width of the insulating sheet.

8. The battery according to claim 1, characterized in that The thickness of the swelling part after swelling is greater than or equal to 0.6 mm.

9. The battery according to claim 8, characterized in that The original rubber thickness of the swelling component before swelling is: the original rubber thickness=0.6 mm / expansion ratio of the swelling component.

10. The battery according to claim 1, characterized in that The swelling member at least comprises a swelling tape.

Images