A petal-shaped stacked battery cell, its preparation method, and a battery containing the cell.

Abstract

This invention relates to the field of lithium-ion battery technology, and in particular to a petal-shaped stacked battery cell. A petal-shaped stacked battery cell includes a cell body, which comprises a plurality of cell units stacked longitudinally in a petal shape around a common axis in a circumferential direction. Each cell unit includes a positive electrode and a negative electrode mounted on one side of the positive electrode. The outer surface of the positive electrode is covered with a separator. The shape of the cell body formed by the stacking of cell units around a common axis in a circumferential direction is any one of a frustum, a truncated cone, or a conical shape. The petal-shaped stacked battery cell provided by this invention conforms well to the shape of irregularly shaped battery casings, resulting in high space utilization in irregularly shaped batteries. This invention also provides a method for preparing the petal-shaped stacked battery cell. Furthermore, this invention provides a battery containing the above-mentioned cell, which conforms well to the irregularly shaped internal space of customer products, resulting in high space utilization.

Description

Technical Field

[0001] This invention relates to the field of lithium-ion battery technology, and in particular to a petal-shaped stacked cell, a method for preparing the same, and a battery containing the same cell. Background Technology

[0002] In some customer products, such as electronic and electrical products and wireless communication products, the internal cavity space used to house the battery is often irregularly shaped, such as a frustum, truncated cone, or conical shape. However, traditional digital lithium-ion batteries are generally cuboid, cylindrical, arc-shaped, or sector-shaped. Therefore, traditional digital lithium-ion batteries do not fit the irregularly shaped internal cavity space in the aforementioned products, resulting in poor space utilization during installation. Thus, there is a need to develop an irregularly shaped battery that fits the irregularly shaped internal cavity space in customer products.

[0003] The aforementioned deficiencies are what those skilled in the art would like to overcome. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned defects in the prior art and provide an irregularly shaped, petal-shaped, stacked battery cell.

[0005] To achieve the above objectives, the present invention provides a petal-shaped stacked battery cell, comprising a battery cell body, wherein the battery cell body comprises a plurality of battery cell units, and the plurality of battery cell units are stacked in a longitudinally arranged petal shape around the same axis along the circumferential direction.

[0006] The cell unit includes a positive electrode and a negative electrode mounted on one side of the positive electrode; the outer surface of the positive electrode is covered with a separator.

[0007] Furthermore, the separator wrapped around the outer surface of the positive electrode is larger than the size of the positive electrode; the separators are heat-sealed together to form a separator bag. By placing the positive electrode inside the separator bag, contact between the positive and negative electrodes is avoided, thus ensuring electronic insulation.

[0008] Preferably, the diaphragm is any one of a polyethylene membrane, a polypropylene membrane, or a composite ceramic membrane.

[0009] Furthermore, the positive electrode sheet includes a positive current collector and a positive active material layer coated on the positive current collector;

[0010] The negative electrode sheet includes a negative electrode current collector and a layer of negative electrode active material coated on the negative electrode current collector.

[0011] Preferably, the positive electrode current collector is aluminum foil or a composite aluminum foil made of polymer material and aluminum; the positive electrode active material layer includes a positive electrode active material, a conductive agent, and a binder; the positive electrode active material is any one of lithium cobalt oxide, nickel-cobalt-manganese ternary, lithium iron phosphate, lithium manganese oxide, and sodium ion.

[0012] Preferably, the negative electrode current collector is a copper foil or a composite copper foil made of polymer material and copper; the negative electrode active material layer includes a negative electrode active material, a conductive agent, and a binder; the negative electrode active material is any one of graphite, silicon carbide, and hard carbon.

[0013] Furthermore, the shape of the battery cell body formed by stacking the battery cell units around the same axis in the circumferential direction is any one of the following: spherical frustum, truncated cone, or conical.

[0014] This invention also provides a method for preparing a petal-shaped laminated battery cell, comprising the following steps:

[0015] S1. Mix the positive electrode active material, conductive agent, and binder evenly to obtain a first mixed slurry; mix the negative electrode active material, conductive agent, and binder evenly to obtain a second mixed slurry;

[0016] S2. Coat the first mixed slurry onto the positive electrode current collector and dry it to obtain the positive electrode sheet; coat the second mixed slurry onto the negative electrode current collector and dry it to obtain the negative electrode sheet;

[0017] S3. Take the positive and negative electrode plates obtained in S2 and punch them to obtain positive and negative electrode plates of specific shapes; take the large diaphragm sheet and punch it to obtain a diaphragm of specific shape.

[0018] S4. Take the separator obtained in S3 and wrap it around the positive electrode from both sides. Heat and pressurize it to make the separators stick together, thereby wrapping the positive electrode in the separator bag.

[0019] S5. Take the positive electrode sheet obtained from S4 and the negative electrode sheet obtained from S3 and stack them alternately around the same axis in the circumferential direction to obtain the battery cell body.

[0020] Preferably, the battery cell body obtained in S5 is fixed by binding with tape.

[0021] The present invention also provides a battery, including a petal-shaped stacked cell as described above, and a battery casing; the cell body is installed inside the battery casing; the battery casing is filled with electrolyte;

[0022] The shape of the battery casing is the same as the shape of the battery cell body, and the shape of the battery casing can be any one of a frustum, a frustum, or a cone. By setting the shape of the battery cell body to be the same as the shape of the battery casing, the battery cell can fully fit the internal structure of the battery casing.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. A petal-shaped stacked battery cell of the present invention comprises a battery cell body formed by stacking several battery cell units around the same axis in a circumferential direction, such that the shape of the battery cell body is any one of a frustum, a frustum, or a cone; and the shape of the battery casing is the same as that of the battery cell body, and the shape of the battery casing is any one of a frustum, a frustum, or a cone; compared with traditional battery cells, the petal-shaped stacked battery cell can fully fit the internal structure of the battery casing, improving the space utilization rate of the petal-shaped stacked battery cell in irregularly shaped battery casings; compared with traditional batteries, the battery containing this battery cell fits snugly into the irregularly shaped internal space of the customer's product, and can fully utilize the irregularly shaped internal space of the customer's product during installation, resulting in higher space utilization;

[0025] 2. By setting the cell unit to include a positive electrode and a negative electrode on one side of the positive electrode, the outer surface of the positive electrode is wrapped with a separator; and the size of the separator wrapped on the outer surface of the positive electrode is larger than the size of the positive electrode. The separators are heat-sealed to form a separator bag by heating, so that the positive electrode is placed in the separator bag, avoiding contact between the positive electrode and the negative electrode, thereby ensuring electronic insulation. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a battery composed of the first type of petal-shaped stacked cells provided in the embodiments of the present invention;

[0027] Figure 2 This is a front view of a battery constructed from the first type of petal-shaped stacked cells provided in this embodiment of the invention;

[0028] Figure 3 This is a schematic diagram of the structure of the first type of petal-shaped stacked battery cell provided in the embodiments of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of a battery composed of a second type of petal-shaped stacked cell provided in an embodiment of the present invention;

[0030] Figure 5 This is a front view of a battery constructed from the second type of petal-shaped stacked cells provided in this embodiment of the invention;

[0031] Figure 6 This is a schematic diagram of the structure of the second type of petal-shaped stacked battery cell provided in the embodiments of the present invention;

[0032] Figure 7 This is a schematic diagram of the structure of a battery composed of the third type of petal-shaped stacked cells provided in the embodiments of the present invention;

[0033] Figure 8 This is a front view of a battery constructed from the third type of petal-shaped stacked cells provided in this embodiment of the invention.

[0034] Figure 9 This is a schematic diagram of the structure of the third type of petal-shaped stacked battery cell provided in the embodiments of the present invention.

[0035] [Explanation of reference numerals in the attached diagram] 1. Battery cell body; 11. Battery cell unit; 112. Positive electrode plate; 113. Negative electrode plate; 2. Battery casing. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1

[0038] Please see Figure 3 The first type of petal-shaped stacked battery cell provided in this embodiment includes a battery cell body 1; the battery cell body 1 includes a plurality of battery cell units 11; the plurality of battery cell units 11 are stacked in a longitudinally arranged petal shape around the same axis in a circumferential direction. The battery cell unit 11 includes a positive electrode 112 and a negative electrode 113; the negative electrode 113 is mounted on one side of the positive electrode 112; the positive electrode 112 and the negative electrode 113 have the same shape; the positive electrode 112 and the negative electrode 113 are stacked around the same axis in a circumferential direction to form the battery cell body 1; in this embodiment, the shape of the battery cell body 1 is frustum-shaped.

[0039] The outer surface of the positive electrode 112 is wrapped with a separator, the size of which is larger than the size of the positive electrode 112. The separators are heat-sealed together to form a separator bag. This allows the positive electrode 112 to be placed inside the separator bag, preventing contact between the positive electrode 112 and the negative electrode 113, thus ensuring electronic insulation. The separator can be any one of a polyethylene film, a polypropylene film, or a composite ceramic film.

[0040] The positive electrode 112 includes a positive current collector and a positive active material layer. The positive current collector includes a positive electrode foil body and a positive electrode tab; the positive electrode foil body and the positive electrode tab belong to the same foil, and the positive electrode tab is disposed at the upper end of the positive electrode foil body. The positive active material layer is coated on the positive electrode foil body. Preferably, the positive active material layer is coated on both the front and back surfaces of the positive electrode foil body. In other embodiments, the positive active material layer may be coated on either the front or back surface of the positive electrode foil body, and is not limited thereto. The positive current collector is aluminum foil. The positive active material layer includes a positive active material, a conductive agent, and a binder; the positive active material is any one of lithium cobalt oxide, nickel-cobalt-manganese ternary cathode, lithium iron phosphate, lithium manganese oxide, and sodium ion.

[0041] The negative electrode sheet 113 includes a negative electrode current collector and a negative electrode active material layer. The negative electrode current collector includes a negative electrode foil body and a negative electrode tab; the negative electrode foil body and the negative electrode tab belong to the same foil sheet, and the negative electrode tab is disposed at the lower end of the negative electrode foil body. The negative electrode active material layer is coated on the negative electrode foil body. Preferably, the negative electrode active material layer is coated on both the front and back surfaces of the negative electrode foil body. In other embodiments, the negative electrode active material layer may be coated on either the front or back surface of the negative electrode foil body, and is not limited thereto. The negative electrode current collector is copper foil. The negative electrode active material layer includes a negative electrode active material, a conductive agent, and a binder; the negative electrode active material is any one of graphite, silicon carbide, and hard carbon.

[0042] Please see Figures 1 to 2 The present invention also provides a battery comprising a petal-shaped stacked cell as described above, and a battery casing 2.

[0043] The battery casing 2 includes a shell and a cover plate; the shell is hollow and has an opening; the cover plate closes to the opening of the shell, forming an accommodating space between the shell and the cover plate. The shape of the battery casing 2 is the same as that of the battery cell body 1, and the shape of the battery casing 2 is frustum-shaped. A first welding groove is provided at the top of the inner cavity of the shell; a second welding groove is provided on the cover plate. The battery cell body 1 is installed inside the battery casing 2. All positive electrode tabs welded together on the battery cell body 1 are welded to the first welding groove; all negative electrode tabs welded together on the battery cell body 1 are welded to the second welding groove. The battery casing 2 is filled with electrolyte. The battery provided in this embodiment, compared with traditional batteries, can make full use of the frustum-shaped inner cavity space in the customer's product during installation, resulting in higher space utilization.

[0044] This embodiment also provides a method for preparing a petal-shaped stacked battery cell, including the following steps:

[0045] S1. Mix the positive electrode active material, conductive agent, and binder evenly to obtain a first mixed slurry; mix the negative electrode active material, conductive agent, and binder evenly to obtain a second mixed slurry;

[0046] S2. Coat the first mixed slurry onto the positive electrode current collector and dry it to obtain the positive electrode sheet; coat the second mixed slurry onto the negative electrode current collector and dry it to obtain the negative electrode sheet;

[0047] S3. Take the positive and negative electrode plates obtained in S2 and punch them to obtain positive electrode plate 112 and negative electrode plate 113 of specific shapes; take the large diaphragm sheet and punch it to obtain a diaphragm of specific shape.

[0048] S4. Take the separator obtained in S3 and wrap it around the positive electrode 112 from both sides. Heat and pressurize it to make the separators stick together, thereby wrapping the positive electrode 112 in the separator bag.

[0049] S5. Take the positive electrode 112 obtained from S4 and the negative electrode 113 obtained from S3 and stack them alternately around the same axis in the circumferential direction to obtain the spherical battery cell body 1.

[0050] Furthermore, all the positive electrode tabs on the cell body 1 obtained in S5 are welded together; all the negative electrode tabs on the cell body 1 obtained in S5 are welded together.

[0051] Furthermore, the battery cell body 1 obtained in S5 is fixed by binding with tape.

[0052] Example 2

[0053] Please see Figure 6 The second type of petal-shaped stacked battery cell provided in this embodiment includes a battery cell body 1; the battery cell body 1 includes a plurality of battery cell units 11; the plurality of battery cell units 11 are stacked in a longitudinally arranged petal shape around the same axis in a circumferential direction. The battery cell unit 11 includes a positive electrode 112 and a negative electrode 113; the negative electrode 113 is mounted on one side of the positive electrode 112; the positive electrode 112 and the negative electrode 113 have the same shape; the positive electrode 112 and the negative electrode 113 are stacked around the same axis in a circumferential direction to form the battery cell body 1; in this embodiment, the shape of the battery cell body 1 is frustum-shaped.

[0054] The outer surface of the positive electrode 112 is wrapped with a separator, the size of which is larger than the size of the positive electrode 112. The separators are heat-sealed together to form a separator bag. This allows the positive electrode 112 to be placed inside the separator bag, preventing contact between the positive electrode 112 and the negative electrode 113, thus ensuring electronic insulation. The separator can be any one of a polyethylene film, a polypropylene film, or a composite ceramic film.

[0055] The positive electrode 112 includes a positive current collector and a positive active material layer. The positive current collector includes a positive electrode foil body and a positive electrode tab; the positive electrode foil body and the positive electrode tab belong to the same foil, and the positive electrode tab is disposed at the upper end of the positive electrode foil body. The positive active material layer is coated on the positive electrode foil body. Preferably, the positive active material layer is coated on both the front and back surfaces of the positive electrode foil body. In other embodiments, the positive active material layer may be coated on either the front or back surface of the positive electrode foil body, and is not limited thereto. The positive current collector is aluminum foil. The positive active material layer includes a positive active material, a conductive agent, and a binder; the positive active material is any one of lithium cobalt oxide, nickel-cobalt-manganese ternary cathode, lithium iron phosphate, lithium manganese oxide, and sodium ion.

[0056] The negative electrode sheet 113 includes a negative electrode current collector and a negative electrode active material layer. The negative electrode current collector includes a negative electrode foil body and a negative electrode tab; the negative electrode foil body and the negative electrode tab belong to the same foil sheet, and the negative electrode tab is disposed at the lower end of the negative electrode foil body. The negative electrode active material layer is coated on the negative electrode foil body. Preferably, the negative electrode active material layer is coated on both the front and back surfaces of the negative electrode foil body. In other embodiments, the negative electrode active material layer may be coated on either the front or back surface of the negative electrode foil body, and is not limited thereto. The negative electrode current collector is copper foil. The negative electrode active material layer includes a negative electrode active material, a conductive agent, and a binder; the negative electrode active material is any one of graphite, silicon carbide, and hard carbon.

[0057] Please see Figures 4 to 5 The present invention also provides a battery comprising a petal-shaped stacked cell as described above, and a battery casing 2.

[0058] The battery casing 2 includes a shell and a cover plate; the shell is hollow and has an opening; the cover plate closes to the opening of the shell, forming an accommodating space between the shell and the cover plate. The shape of the battery casing 2 is the same as that of the battery cell body 1, and the shape of the battery casing 2 is frustum-shaped. A first welding groove is provided at the top of the inner cavity of the shell; a second welding groove is provided on the cover plate. The battery cell body 1 is installed inside the battery casing 2. All positive electrode tabs welded together on the battery cell body 1 are welded to the first welding groove; all negative electrode tabs welded together on the battery cell body 1 are welded to the second welding groove. The battery casing 2 is filled with electrolyte. The battery provided in this embodiment, compared with traditional batteries, can make full use of the frustum-shaped inner cavity space in the customer's product during installation, resulting in higher space utilization.

[0059] This embodiment also provides a method for preparing a petal-shaped stacked battery cell, including the following steps:

[0060] S1. Mix the positive electrode active material, conductive agent, and binder evenly to obtain a first mixed slurry; mix the negative electrode active material, conductive agent, and binder evenly to obtain a second mixed slurry;

[0061] S2. Coat the first mixed slurry onto the positive electrode current collector and dry it to obtain the positive electrode sheet; coat the second mixed slurry onto the negative electrode current collector and dry it to obtain the negative electrode sheet;

[0062] S3. Take the positive and negative electrode plates obtained in S2 and punch them to obtain positive electrode plate 112 and negative electrode plate 113 of specific shapes; take the large diaphragm sheet and punch it to obtain a diaphragm of specific shape.

[0063] S4. Take the separator obtained in S3 and wrap it around the positive electrode 112 from both sides. Heat and pressurize it to make the separators stick together, thereby wrapping the positive electrode 112 in the separator bag.

[0064] S5. Take the positive electrode 112 obtained from S4 and the negative electrode 113 obtained from S3 and stack them alternately around the same axis in the circumferential direction to obtain a frustum-shaped cell body 1.

[0065] Furthermore, all the positive electrode tabs on the cell body 1 obtained in S5 are welded together; all the negative electrode tabs on the cell body 1 obtained in S5 are welded together.

[0066] Furthermore, the battery cell body 1 obtained in S5 is fixed by binding with tape.

[0067] Example 3

[0068] Please see Figure 9 This embodiment provides a third type of petal-shaped stacked battery cell, comprising a battery cell body 1; the battery cell body 1 includes a plurality of battery cell units 11; the plurality of battery cell units 11 are stacked in a longitudinally arranged petal shape around the same axis in a circumferential direction. Each battery cell unit 11 includes a positive electrode 112 and a negative electrode 113; the negative electrode 113 is disposed on one side of the positive electrode 112; the positive electrode 112 and the negative electrode 113 have the same shape; the positive electrode 112 and the negative electrode 113 are stacked around the same axis in a circumferential direction to form the battery cell body 1; in this embodiment, the battery cell body 1 is conical in shape.

[0069] The outer surface of the positive electrode 112 is wrapped with a separator, the size of which is larger than the size of the positive electrode 112. The separators are heat-sealed together to form a separator bag. This allows the positive electrode 112 to be placed inside the separator bag, preventing contact between the positive electrode 112 and the negative electrode 113, thus ensuring electronic insulation. The separator can be any one of a polyethylene film, a polypropylene film, or a composite ceramic film.

[0070] The positive electrode sheet 112 includes a positive electrode current collector and a positive electrode active material layer. The positive electrode current collector includes a positive electrode foil body and a positive electrode tab; the positive electrode foil body and the positive electrode tab belong to the same foil sheet, and the positive electrode tab is disposed at the upper end of the positive electrode foil body. The positive electrode active material layer is coated on the positive electrode foil body. Preferably, the positive electrode active material layer is coated on both the front and back surfaces of the positive electrode foil body. In other embodiments, the positive electrode active material layer can be configured to be coated on either the front or back surface of the positive electrode foil body, and is not limited thereto. The positive electrode current collector is a composite aluminum foil composed of a polymer material and aluminum. The positive electrode active material layer includes a positive electrode active material, a conductive agent, and a binder; the positive electrode active material is any one of lithium cobalt oxide, nickel-cobalt-manganese ternary cathode, lithium iron phosphate, lithium manganese oxide, and sodium ion.

[0071] The negative electrode sheet 113 includes a negative electrode current collector and a negative electrode active material layer. The negative electrode current collector includes a negative electrode foil body and a negative electrode tab; the negative electrode foil body and the negative electrode tab belong to the same foil sheet, and the negative electrode tab is disposed at the lower end of the negative electrode foil body. The negative electrode active material layer is coated on the negative electrode foil body. Preferably, the negative electrode active material layer is coated on both the front and back surfaces of the negative electrode foil body. In other embodiments, the negative electrode active material layer may be coated on either the front or back surface of the negative electrode foil body, and is not limited thereto. The negative electrode current collector is a composite copper foil composed of a polymer material and copper. The negative electrode active material layer includes a negative electrode active material, a conductive agent, and a binder; the negative electrode active material is any one of graphite, silicon carbide, and hard carbon.

[0072] Please see Figures 7 to 8 The present invention also provides a battery comprising a petal-shaped stacked cell as described above, and a battery casing 2.

[0073] The battery casing 2 includes a shell and a cover plate; the shell is hollow and has an opening; the cover plate closes to the opening of the shell, forming an accommodating space between the shell and the cover plate. The shape of the battery casing 2 is the same as that of the battery cell body 1, and the shape of the battery casing 2 is conical. A first welding groove is provided at the top of the inner cavity of the shell; a second welding groove is provided on the cover plate. The battery cell body 1 is installed inside the battery casing 2. All positive electrode tabs welded together on the battery cell body 1 are welded to the first welding groove; all negative electrode tabs welded together on the battery cell body 1 are welded to the second welding groove. The battery casing 2 is filled with electrolyte. The battery provided in this embodiment, compared with traditional batteries, can make full use of the conical inner cavity space in the customer's product during installation, resulting in higher space utilization.

[0074] This embodiment also provides a method for preparing a petal-shaped stacked battery cell, including the following steps:

[0075] S1. Mix the positive electrode active material, conductive agent, and binder evenly to obtain a first mixed slurry; mix the negative electrode active material, conductive agent, and binder evenly to obtain a second mixed slurry;

[0076] S2. Coat the first mixed slurry onto the positive electrode current collector and dry it to obtain the positive electrode sheet; coat the second mixed slurry onto the negative electrode current collector and dry it to obtain the negative electrode sheet;

[0077] S3. Take the positive and negative electrode plates obtained in S2 and punch them to obtain positive electrode plate 112 and negative electrode plate 113 of specific shapes; take the large diaphragm sheet and punch it to obtain a diaphragm of specific shape.

[0078] S4. Take the separator obtained in S3 and wrap it around the positive electrode 112 from both sides. Heat and pressurize it to make the separators stick together, thereby wrapping the positive electrode 112 in the separator bag.

[0079] S5. Take the positive electrode 112 obtained from S4 and the negative electrode 113 obtained from S3 and stack them alternately around the same axis in the circumferential direction to obtain a conical battery cell body 1.

[0080] Furthermore, all the positive electrode tabs on the cell body 1 obtained in S5 are welded together; all the negative electrode tabs on the cell body 1 obtained in S5 are welded together.

[0081] Furthermore, the battery cell body 1 obtained in S5 is fixed by binding with tape.

[0082] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A petal-shaped stacked battery cell, comprising a cell body (1), characterized in that, The battery cell body (1) includes a plurality of battery cell units (11), which are stacked in a longitudinally arranged petal shape around the same axis in the circumferential direction. The battery cell unit (11) includes a positive electrode plate (112) and a negative electrode plate (113) mounted on one side of the positive electrode plate (112); the outer surface of the positive electrode plate (112) is covered with a separator; The shape of the battery cell body (1) formed by stacking the battery cell units (11) around the same axis in the circumferential direction is any one of the following: spherical frustum, truncated cone, or conical.

2. The petal-shaped laminated battery cell according to claim 1, characterized in that, The size of the separator wrapped on the outer surface of the positive electrode (112) is larger than the size of the positive electrode (112); the separators are heat-sealed by heating to form a separator bag.

3. A petal-shaped laminated battery cell according to claim 2, characterized in that, The diaphragm is any one of polyethylene membrane, polypropylene membrane, or composite ceramic membrane.

4. A petal-shaped laminated battery cell according to claim 1, characterized in that, The positive electrode sheet (112) includes a positive current collector and a positive active material layer coated on the positive current collector; The negative electrode sheet (113) includes a negative electrode current collector and a layer of negative electrode active material coated on the negative electrode current collector.

5. A petal-shaped laminated battery cell according to claim 4, characterized in that, The positive electrode current collector is aluminum foil or a composite aluminum foil made of polymer material and aluminum; the positive electrode active material layer includes positive electrode active material, conductive agent and binder; the positive electrode active material is any one of lithium cobalt oxide, nickel cobalt manganese ternary, lithium iron phosphate and lithium manganese oxide.

6. A petal-shaped laminated battery cell according to claim 4, characterized in that, The negative electrode current collector is a copper foil or a composite copper foil made of polymer material and copper; the negative electrode active material layer includes a negative electrode active material, a conductive agent and a binder; the negative electrode active material is any one of graphite, silicon carbide and hard carbon.

7. A method for preparing a petal-shaped laminated battery cell according to any one of claims 1-6, characterized in that, Includes the following steps: S1. Mix the positive electrode active material, conductive agent, and binder evenly to obtain a first mixed slurry; mix the negative electrode active material, conductive agent, and binder evenly to obtain a second mixed slurry; S2. Coat the first mixed slurry onto the positive electrode current collector and dry it to obtain the positive electrode sheet; coat the second mixed slurry onto the negative electrode current collector and dry it to obtain the negative electrode sheet; S3. Take the positive and negative electrode plates obtained in S2 and punch them to obtain positive electrode plates (112) and negative electrode plates (113) of specific shapes; take the large diaphragm sheet and punch it to obtain a diaphragm of specific shape. S4. Take the separator obtained in S3 and wrap it around the positive electrode (112) from both sides. Heat and pressurize it to make the separator stick together, thereby wrapping the positive electrode (112) in the separator bag. S5. Take the positive electrode (112) obtained from S4 and the negative electrode (113) obtained from S3 and stack them alternately around the same axis in the circumferential direction to obtain the battery cell body (1).

8. The method for preparing a petal-shaped stacked battery cell according to claim 7, characterized in that, The battery cell body (1) obtained in S5 is fixed by binding with tape.

9. A battery comprising a petal-shaped stacked cell as described in any one of claims 1-6, characterized in that, It also includes a battery casing (2); the battery cell body (1) is installed inside the battery casing (2); the battery casing (2) is filled with electrolyte; The shape of the battery casing (2) is the same as the shape of the battery cell body (1), and the shape of the battery casing (2) is any one of the following: spherical frustum, truncated cone, or conical.

Images