All-solid-state laminated cylindrical battery

Abstract

The utility model belongs to the technical field of all-solid-state batteries, and discloses an all-solid-state laminated cylindrical battery, which comprises a battery cell unit and a shell, the battery cell unit comprises a plurality of battery packs which are stacked up and down, the plurality of battery packs are connected, each battery pack comprises an electrode plate and an insulating layer, the electrode plate comprises a positive plate and a negative plate which are stacked in a staggered manner, and the insulating layer is arranged between the positive plate and the negative plate. An insulating layer is clamped between the adjacent positive plate and negative plate, two electrode plates positioned at two opposite ends in the stacking direction in the battery pack are both negative plates, the shell is cylindrical and is of a sealed structure, the battery cell unit is placed in the shell, and the shell applies pressure to the battery cell unit along the height direction of the shell; a battery cell unit is decomposed into a plurality of battery packs, so that the assembling difficulty of the battery packs is reduced, each battery pack comprises an all-solid-state electrode plate and an all-solid-state insulating layer, a positive plate, a negative plate and the insulating layer are laminated, and the all-solid-state electrode plate and the all-solid-state insulating layer are assembled in the cylindrical battery through the lamination design.

Description

TECHNICAL FIELD

[0001] The utility model relates to all solid state battery technical field especially relates to a kind of all solid state lamination cylindrical battery. BACKGROUND

[0002] With the development of lithium battery, the requirement of energy density of battery cell is higher and higher in industry, all solid state battery becomes the research focus of various colleges and universities scientific research institutions and battery enterprises, all solid state battery is a new battery technology, compared with traditional liquid electrolyte battery, it has higher energy density, longer cycle life and better safety.The core feature of all solid state battery is to replace liquid electrolyte with solid electrolyte, which not only eliminates the leakage and flammable risk brought by liquid electrolyte, but also improves the stability and reliability of battery.

[0003] The existing all solid state battery is basically developed with small size soft package battery cell, and the packaging form and mechanical strength of aluminum plastic film cannot cover part of the harsh application scenarios, cylindrical steel shell or aluminum shell battery can make up for the above defects in structure, but the manufacturing process of conventional cylindrical battery is completed in the form of winding, and the tension and toughness of all solid state electrode and insulation layer are difficult to meet the winding process. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a kind of all solid state lamination cylindrical battery, meet the assembly of all solid state electrode and insulation layer in cylindrical battery.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] An all solid state lamination cylindrical battery, comprising:

[0007] Battery cell unit, the battery cell unit includes a plurality of upper and lower stacked battery packs, a plurality of the battery packs are connected, the battery pack includes electrode sheet and insulation layer, the electrode sheet includes staggered layering positive sheet and negative sheet, the insulation layer is arranged between adjacent positive sheet and negative sheet, two electrode sheets at opposite ends of the battery pack in the stacking direction are both negative sheets;

[0008] Shell, the shell is cylindrical and is sealed structure, the battery cell unit is placed in the inside of the shell, and the shell exerts pressure on the battery cell unit along its height direction.

[0009] As preferred, the shell includes cylinder, positive cover plate and negative cover plate, the cylinder is cylindrical and its two ends are open, the positive cover plate and the negative cover plate synchronize the pressure on the battery cell unit, and the positive cover plate and the negative cover plate are respectively welded in the two open ends of the cylinder.

[0010] As preferred, the shell comprises a cylinder and a positive cover plate, the cylinder is cylindrical and one end is open, the positive cover plate is arranged at the open end of the cylinder, a high-pressure elastic sheet is arranged between the positive cover plate and the battery cell unit, the positive cover plate extrudes the high-pressure elastic sheet, the open end of the cylinder is provided with two recessed grooves towards the inside of the cylinder, the grooves extend along the circumference of the cylinder, and the two grooves are arranged in the height direction of the cylinder.

[0011] As preferred, the number of layers of the positive plate in the battery pack is ≤17, and the number of layers of the negative plate is ≤18.

[0012] As preferred, it also comprises a positive overcurrent plate and a negative overcurrent plate, the positive of the battery pack is connected to the positive overcurrent plate, and the negative of the battery pack is connected to the negative overcurrent plate.

[0013] As preferred, it also comprises two gaskets arranged inside the shell, one of the gaskets abuts one of the opposite ends of the battery cell unit in the stacking direction, and the other gasket abuts the other end of the opposite ends of the battery cell unit in the stacking direction.

[0014] As preferred, the outer surface of the battery pack is coated with insulating glue.

[0015] As preferred, the battery pack also comprises a positive connection plate and a negative connection plate, at least part of the positive plate protrudes to form a positive lug, and at least part of the negative plate protrudes to form a negative lug, the positive lug in the same battery pack is welded to the positive connection plate, and the negative lug in the same battery pack is welded to the negative connection plate.

[0016] As preferred, the projections of a plurality of the positive lugs on a horizontal plane overlap, the projections of a plurality of the negative lugs on a horizontal plane overlap, and the positive lugs and the negative lugs are located on opposite sides of the battery pack.

[0017] As preferred, the strip height of the positive lug and the strip height of the negative lug are both 0.5mm-2mm, the positive lug and the positive plate form an inclined angle a, the negative lug and the negative plate form an inclined angle b, and 0°<a、b<90°.

[0018] The beneficial effects of the utility model are as follows:

[0019] The utility model provides a kind of full solid laminated cylindrical battery including electric core unit and shell, electric core unit includes multiple upper and lower laminated battery packs, multiple battery packs are connected, and battery pack includes electrode sheet and insulating layer, electrode sheet includes positive sheet and negative sheet of staggered laminated arrangement, and insulating layer is arranged between adjacent positive sheet and negative sheet, two pole pieces in battery pack located at opposite ends in laminated direction are all negative sheet, shell is cylindrical and is sealed structure, electric core unit is placed in the inside of shell, and shell exerts pressure on electric core unit along its height direction;The utility model provides a kind of full solid laminated cylindrical battery by decomposing electric core unit into multiple battery packs to reduce core package assembly difficulty, and battery pack includes full solid electrode sheet and full solid insulating layer, positive sheet, negative sheet and insulating layer are laminated arrangement, realize the assembly of full solid electrode sheet and full solid insulating layer in cylindrical battery by laminated design. BRIEF DESCRIPTION OF DRAWINGS DETAILED DESCRIPTION OF THE INVENTION BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the structure schematic diagram of positive sheet provided by the utility model embodiment;

[0021] Figure 2 It is the structure schematic diagram of negative sheet provided by the utility model embodiment;

[0022] Figure 3 It is the structure schematic diagram of battery pack provided by the utility model embodiment;

[0023] Figure 4 It is the structure schematic diagram of a kind of full solid laminated cylindrical battery provided by the utility model embodiment.

[0024] In the figure:

[0025] 1, insulating layer;2, positive sheet;21, positive lug;3, negative sheet;31, negative lug;41, barrel;5, high-pressure spring;6, gasket;7, positive connecting piece;8, negative connecting piece. DETAILED DESCRIPTION

[0026] The utility model will be further explained in detail in connection with the drawings and embodiment.It can be understood that the specific embodiment described here is only used to explain the utility model, and is not limited to the utility model.In addition, it needs to be explained that, for the convenience of description, only part related to the utility model is shown in the drawing, not all structures.

[0027] In the description of the utility model, unless another definite provision and limitation, the term "connect", "connection", "fixed" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be two elements inside the communication or two element interaction relationship.For the ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0028] In the utility model, unless another definite provision and limitation, the first feature is "on" or "under" the second feature can include the first and second features direct contact, also can include the first and second features are not direct contact but contact through the additional features between them.Moreover, the first feature is "on", "above" and "on" the second feature includes the first feature is directly above and obliquely above the second feature, or just indicates that the first feature horizontal height is higher than the second feature.The first feature is "under", "below" and "under" the second feature includes the first feature is directly below and obliquely below the second feature, or just indicates that the first feature horizontal height is less than the second feature.

[0029] In the description of the embodiment, the terms "on", "under", "right", etc. Orientation or positional relationship is based on the orientation or positional relationship shown in the drawing, only for the convenience of description and simplification operation, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the utility model.In addition, the terms "first", "second" are only used to distinguish in the description, and have no special meaning.

[0030] The embodiment provides a full solid laminated cylindrical battery, please refer to Figures 1-4 , including the cell unit and the shell, the cell unit is placed in the inside of the shell, the inside cell unit includes a plurality of upper and lower stacked battery packs, a plurality of battery packs are connected with each other, the connection method is adopted in series or parallel according to actual voltage needs, each battery pack includes electrode sheet and insulating layer 1, the electrode sheet includes positive sheet 2 and negative sheet 3 arranged in staggered layers, and the insulating layer 1 is arranged between adjacent positive sheet 2 and negative sheet 3.

[0031] Exemplarily, the insulating layer 1 is a full solid electrolyte film, instead of the separator in the traditional liquid battery, can play the role of ion transmission, electronic insulation, is made of sulfide, oxide, halide, polymer and adhesive such as (PTFE / TPA material) mixture, can effectively isolate positive sheet 2 and negative sheet 3, while allowing lithium ions to pass through.

[0032] The embodiment reduces the difficulty of assembling the core package by decomposing the battery cell unit into a plurality of battery packs, the battery pack comprising a full-solid electrode sheet and a full-solid insulation layer 1, the positive electrode sheet 2, the negative electrode sheet 3 and the insulation layer 1 being stacked, avoiding the use of the conventional winding form in the cylindrical battery, and realizing the assembly of the full-solid electrode sheet and the full-solid insulation layer 1 in the cylindrical battery through the lamination design.

[0033] Preferably, the battery cell unit comprises n battery packs stacked up and down, 1 < n < 20, and the plurality of battery packs stacked up and down are connected.

[0034] Further, referring to Figure 3 , the electrode sheet comprises the positive electrode sheet 2 and the negative electrode sheet 3, a plurality of positive electrode sheets 2 and a plurality of negative electrode sheets 3 are interleaved and stacked, and the insulation layer 1 is arranged between adjacent positive electrode sheets 2 and negative electrode sheets 3 to prevent direct contact between the positive electrode sheet 2 and the negative electrode sheet 3 and avoid short circuit.

[0035] Further, the two electrode sheets at opposite ends of the battery pack in the stacking direction are both negative electrode sheets 3, and through the above arrangement, the risk of short circuit can be reduced.

[0036] Optionally, the number of layers of the positive electrode sheet 2 in the battery pack is ≤ 17, and the number of layers of the negative electrode sheet 3 is ≤ 18.

[0037] Referring to Figure 1 and Figure 2 , at least part of the positive electrode sheet 2 protrudes to form a positive electrode tab 21, and at least part of the negative electrode sheet 3 protrudes to form a negative electrode tab 31, and the plurality of positive electrode tabs 21 in each battery pack are connected to form a positive electrode, and the plurality of negative electrode tabs 31 in each battery pack are connected to form a negative electrode. Specifically, the plurality of positive electrode tabs 21 in each battery pack are connected through the positive electrode connecting piece 7, and the plurality of negative electrode tabs 31 in each battery pack are connected through the negative electrode connecting piece 8. Preferably, the connection mode between the positive electrode tab 21 and the positive electrode connecting piece 7 is ultrasonic welding, and similarly, the connection mode between the negative electrode tab 31 and the negative electrode connecting piece 8 is also ultrasonic welding, and the connection strength is large.

[0038] In the embodiment, the projections of the plurality of positive electrode tabs 21 on the horizontal plane overlap, the projections of the plurality of negative electrode tabs 31 on the horizontal plane overlap, and the positive electrode tab 21 and the negative electrode tab 31 are located at opposite sides of the battery pack, thereby effectively separating the positive and negative electrodes of the battery pack, reducing the risk of short circuit, and also simplifying the connection structure of the positive electrode tab 21 and the positive electrode connecting piece 7, and the connection structure between the negative electrode tab 31 and the negative electrode connecting piece 8.

[0039] The plurality of battery packs stacked up and down are connected through the positive electrode overcurrent piece and the negative electrode overcurrent piece, specifically, the positive electrode overcurrent piece is sequentially welded with a plurality of positive electrode connecting pieces 7, and the negative electrode overcurrent piece is sequentially welded with a plurality of negative electrode connecting pieces 8.

[0040] Preferably, the diameter of the positive electrode sheet 2, the negative electrode sheet 3 and the insulating layer 1 is ≤1.05 cm, and the strip height of the positive electrode tab 21 and the strip height of the negative electrode tab 31 are both between 0.5 mm and 2 mm, so as to ensure the welding strength. Further preferably, the positive electrode tab 21 and the positive electrode sheet 2 form an inclined angle a, and the negative electrode tab 31 and the negative electrode sheet 3 form an inclined angle b, 0° < a, b < 90°, so as to save space and provide good welding contact.

[0041] During the assembly process of the battery pack, the positive electrode sheet 2 and the negative electrode sheet 3 are first arranged in an interleaved and stacked manner, and the insulating layer 1 is arranged between the positive electrode sheet 2 and the negative electrode sheet 3. After the stacking is completed, the core is formed by hot pressing, and the insulating glue such as PET glue is applied to the additional surface of the core. Further, the plurality of positive electrode tabs 21 are ultrasonically welded to the positive electrode connecting sheet 7, and the plurality of negative electrode tabs 31 are ultrasonically welded to the negative electrode connecting sheet 8, thereby forming the battery pack.

[0042] In the embodiment, the shell is in a cylindrical shape and is in a sealed structure. The cell unit is placed in the interior of the shell. The shell exerts pressure on the cell unit along the height direction of the shell. The pressure value is 0.2 Mpa-50 Mpa, so as to meet the pressure requirement of the all-solid-state battery.

[0043] Further, the interior of the shell further comprises two gaskets 6. One of the two gaskets 6 abuts against one of the opposite ends of the cell unit in the stacking direction, and the other gasket 6 abuts against the other of the opposite ends of the cell unit in the stacking direction. By arranging the two gaskets 6, the positive electrode of the cell unit can be prevented from directly contacting the shell, and the overall structural stability can be enhanced, so as to prevent the electrolyte from leaking or external moisture from entering the interior, thereby prolonging the service life. Preferably, the gasket 6 is made of steel.

[0044] The embodiment provides two structures meeting the pressure requirement of the all-solid-state battery:

[0045] Alternatively, the shell comprises a barrel 41. The barrel 41 is in a cylindrical shape, and the two ends of the barrel 41 are open. The cell unit is arranged in the interior of the barrel 41. The two gaskets 6 abut against the opposite ends of the cell unit in the stacking direction. The positive electrode cover plate and the negative electrode cover plate are arranged at the two open ends of the barrel 41, respectively. The positive electrode cover plate and the negative electrode cover plate are synchronously pressurized to exert a pressure of 0.2 Mpa-50 Mpa on the cell unit. During the pressurizing process, the positive electrode cover plate and the negative electrode cover plate are respectively laser-welded to the two open ends of the barrel 41.

[0046] Optionally, the shell comprises a cylinder 41, the cylinder 41 is cylindrical, and one end of the cylinder 41 is open, the battery cell unit is arranged in the interior of the cylinder 41, the two gaskets 6 are respectively abutted against opposite ends in the stacking direction of the battery cell unit, the positive electrode cover plate is arranged at the open end of the cylinder 41, the high-pressure spring 5 is clamped between the positive electrode cover plate and the gasket 6 adjacent to the positive electrode cover plate, the positive electrode cover plate extrudes the high-pressure spring 5, thereby exerting a pressure of 0.2Mpa-50Mpa on the battery cell unit, in the process, two rolling grooves are arranged at the open end of the cylinder 41 by a rolling groove device, the two rolling grooves are recessed towards the interior of the cylinder 41 and extend along the circumference of the cylinder 41, and the two rolling grooves are arranged in the height direction of the cylinder 41, the positive electrode cover plate is sealed and clamped between the two rolling grooves.

[0047] The embodiment avoids adopting the conventional winding form in the cylindrical battery, reduces the assembly difficulty of the core pack by decomposing the battery cell unit into a plurality of battery packs, the battery pack comprises the all-solid-state electrode sheet and the all-solid-state insulation layer 1, the positive electrode sheet 2, the negative electrode sheet 3 and the insulation layer 1 are stacked, the all-solid-state electrode sheet and the all-solid-state insulation layer 1 are assembled in the cylindrical battery through the sheet stacking design.

[0048] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation of the embodiments of the utility model. For ordinary skilled in the art, various obvious changes, re-adjustment and replacement can be carried out without departing from the protection scope of the utility model. Here, all the embodiments need not and cannot be exhausted. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A all-solid-state stacked cylindrical battery, characterized by, The application relates to a cylindrical battery cell unit and a battery cell unit. The battery cell unit comprises a plurality of battery packs stacked one above another, and the battery packs are connected; the battery pack comprises an electrode sheet and an insulating layer (1), the electrode sheet comprises positive electrode sheets (2) and negative electrode sheets (3) arranged in an interlaced manner, the insulating layer (1) is arranged between adjacent positive electrode sheets (2) and negative electrode sheets (3), and the two electrode sheets at opposite ends of the battery pack in the stacking direction are both negative electrode sheets (3). The battery cell unit is placed in the inside of the shell, and the shell applies pressure to the battery cell unit along the height direction of the shell.

2. The all-solid-state stacked cylindrical battery according to claim 1, characterized by, The shell comprises a cylinder (41), a positive electrode cover plate and a negative electrode cover plate, the cylinder (41) is cylindrical and has two open ends, the positive electrode cover plate and the negative electrode cover plate apply pressure to the battery cell unit synchronously, and the positive electrode cover plate and the negative electrode cover plate are welded to the two open ends of the cylinder (41) respectively.

3. The all-solid-state stacked cylindrical battery according to claim 1, characterized by, The shell comprises a cylinder (41) and a positive electrode cover plate, the cylinder (41) is cylindrical and has one open end, the positive electrode cover plate is arranged at the open end of the cylinder (41), a high-pressure elastic sheet (5) is arranged between the positive electrode cover plate and the battery cell unit, the positive electrode cover plate extrudes the high-pressure elastic sheet (5), the open end of the cylinder (41) is provided with two rolling grooves recessed towards the inside of the cylinder (41), the rolling grooves extend along the circumferential direction of the cylinder (41), and the two rolling grooves are arranged at intervals along the height direction of the cylinder (41), the positive electrode cover plate is sealingly arranged between the two rolling grooves.

4. The all-solid-state stacked cylindrical battery according to claim 1, characterized by, The number of layers of the positive electrode sheets (2) in the battery pack is less than or equal to 17, and the number of layers of the negative electrode sheets (3) is less than or equal to 18.

5. The all-solid-state stacked cylindrical battery according to claim 1, characterized by, The battery pack is further provided with a positive electrode overcurrent sheet and a negative electrode overcurrent sheet, the positive electrode of the battery pack is connected to the positive electrode overcurrent sheet, and the negative electrode of the battery pack is connected to the negative electrode overcurrent sheet.

6. The all-solid-state stacked cylindrical battery according to claim 1, characterized by, The battery pack is further provided with two spacers (6), one of the spacers (6) is arranged at one of the opposite ends of the battery cell unit in the stacking direction, and the other spacer (6) is arranged at the other end of the battery cell unit in the stacking direction.

7. The all-solid-state stacked cylindrical battery according to claim 1, characterized by, The outer surface of the battery pack is coated with insulating glue.

8. The all-solid-state stacked cylindrical battery according to claim 4, characterized by, The battery pack is further provided with a positive electrode connecting sheet (7) and a negative electrode connecting sheet (8), at least part of the positive electrode sheet (2) is extruded to form a positive electrode tab (21), at least part of the negative electrode sheet (3) is extruded to form a negative electrode tab (31), the positive electrode tabs (21) in the same battery pack are welded to the positive electrode connecting sheet (7), and the negative electrode tabs (31) in the same battery pack are welded to the negative electrode connecting sheet (8).

9. A fully solid-state stacked cylindrical battery according to claim 8, wherein The projections of a plurality of the positive electrode tabs (21) on a horizontal plane overlap, the projections of a plurality of the negative electrode tabs (31) on a horizontal plane overlap, and the positive electrode tabs (21) and the negative electrode tabs (31) are arranged on opposite sides of the battery pack.

10. The all-solid-state stacked cylindrical battery according to claim 8, characterized by, The strip height of the positive tab (21) and the strip height of the negative tab (31) are both 0.5mm-2mm, the positive tab (21) and the positive plate (2) form an inclined angle a, the negative tab (31) and the negative plate (3) form an inclined angle b, 0°<a、b<90°.

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