Special-shaped pole piece, battery cell and battery

Abstract

The special-shaped pole piece comprises a positive pole piece and a negative pole piece, the positive pole piece and the negative pole piece are concave-shaped, notch ends of the positive pole piece and the negative pole piece are top ends respectively, two ends of a notch are a left top end and a right top end respectively, a positive pole lug is arranged at the left top end of the positive pole piece, and a negative pole lug is arranged at the right top end of the negative pole piece. And a negative tab is arranged at the right top end of the negative plate. The utility model has the beneficial effects that the pole piece, the battery cell and the battery are all arranged to be concave-shaped, so that the suitability of the battery to an electronic product is improved, especially for the electronic product with a concave battery cavity, the space utilization rate of the battery cavity is improved, and the volume and the capacity of the battery are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a battery technical field, concretely relates to a special-shaped pole piece, electric core and battery. BACKGROUND

[0002] Lithium ion battery has become an important part of modern social energy revolution, and is widely used in new energy vehicles, energy storage systems, aerospace and electronic products and other fields, because of its high energy density, long cycle life, safety and reliability and other advantages. Moreover, with the continuous improvement of people's living standards, electronic products that meet people's individual needs are emerging in an endless stream, and wireless mobile products, electronic watches and other wearable electronic products are changing with each passing day. The space in the battery cavity of the compact product limited in space, such as smart watch, medical monitoring product, is usually irregular, while the traditional lithium ion battery is usually cylindrical or square. In the adaptation of various electronic products, the battery cavity space of electronic products is often wasted due to the limitation of square or cylindrical shape, resulting in poor endurance. SUMMARY

[0003] The utility model discloses a special-shaped pole piece, electric core and battery, which are all set to concave shape, increase the adaptability of battery to electronic products, especially electronic products with concave battery cavity, improve the space utilization rate of battery cavity, and improve the volume and capacity of battery.

[0004] The utility model discloses a special-shaped pole piece, electric core and battery, which are all set to concave shape, increase the adaptability of battery to electronic products, especially electronic products with concave battery cavity, improve the space utilization rate of battery cavity, and improve the volume and capacity of battery.

[0005] In some embodiments, the concave shape part of the positive pole piece and the negative pole piece is a left-right symmetrical structure.

[0006] In some embodiments, the size of the negative pole piece is greater than that of the positive pole piece.

[0007] In some embodiments, the positive pole piece and the positive pole ear are integrally formed, and the negative pole piece and the negative pole ear are integrally formed.

[0008] A special-shaped electric core, the electric core is Z-shaped laminated core, the electric core includes diaphragm and the positive pole piece and the negative pole piece, the diaphragm includes a plurality of diaphragm monomers, the diaphragm monomer is the concave shape that is matched with the shape of positive pole piece and negative pole piece, the positive pole piece, diaphragm monomer and negative pole piece are stacked, and the diaphragm monomer is arranged between the positive pole piece and the negative pole piece.

[0009] In some embodiments, the size of the separator monomer is larger than the size of the negative electrode sheet.

[0010] In some embodiments, the diaphragm is one of a polyolefin diaphragm, a ceramic-coated diaphragm, a nonwoven fabric diaphragm, and a solid electrolyte diaphragm.

[0011] An irregularly shaped battery includes a casing and an irregularly shaped battery cell. The casing has a U-shaped structure and includes an upper casing and a lower casing. Both the upper casing and the lower casing are provided with U-shaped grooves. The grooves of the upper casing and the lower casing together form a receiving cavity for accommodating the irregularly shaped battery cell.

[0012] Compared with existing technologies, the beneficial effects of this invention are as follows: This invention sets the positive and negative electrode plates into a concave shape, stacks the positive and negative electrode plates to form a battery cell, and places the battery cell in a concave shell to form an irregularly shaped battery. This increases the battery's adaptability to irregularly shaped battery cavities in electronic products, especially those with concave battery cavities, improving the space utilization of the battery cavity and increasing the battery's volume and capacity. Furthermore, this invention symmetrically arranges the positive and negative electrode tabs at the top of the concave electrode plates, better matching the battery's shape. This not only facilitates packaging and integration but also helps optimize the battery's internal structure within a limited space, improving space utilization. The tabs at the top also shorten the current transmission distance, thereby reducing the battery's internal resistance. In addition, this invention uses a concave battery shell that matches the concave battery cell. The concave shell can fit the non-planar internal space of electronic products, improving space utilization. The use of stacked battery cells fully utilizes the internal space of the battery shell, improving the internal space utilization of the battery. Compared with wound battery cells, it can fully utilize the corner space of the battery shell, increasing the cell size and capacity.

[0013] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0014] Fig. 1 This is a schematic diagram of the positive electrode structure.

[0015] Fig. 2 This is a schematic diagram of the negative electrode.

[0016] Fig. 3 This is a schematic diagram of the diaphragm structure.

[0017] Fig. 4 This is a schematic diagram of the battery cell structure.

[0018] Fig. 5 This is a schematic diagram of the battery structure.

[0019] Among them, 1. positive electrode tab, 2. negative electrode tab, 3. diaphragm unit, 4. shell. Detailed Implementation

[0020] like Figs. 1 to 5 As shown, an irregularly shaped electrode includes a positive electrode and a negative electrode, both of which are U-shaped. The concave ends of the positive and negative electrode are the tops, and the two sides of the concave ends are the left and right tops, respectively. The positive electrode has a positive tab 1 at the left top, and the negative electrode has a negative tab 2 at the right top. When the positive and negative electrode are stacked, the positive tab 1 and the negative tab 2 are located symmetrically at the tops of the U-shapes.

[0021] In some embodiments, the concave portions of the positive and negative electrodes are symmetrical.

[0022] In some embodiments, the size of the negative electrode is larger than the size of the positive electrode. Specifically, the concave area of ​​the negative electrode is larger than the concave area of ​​the positive electrode. More preferably, when the positive and negative electrodes are stacked, the distance between the circumferential edge of the negative electrode and the circumferential edge of the positive electrode is 1-3 mm.

[0023] A non-standard battery cell, wherein the battery cell is a Z-shaped stacked battery cell, the battery cell includes a positive electrode and a negative electrode, and a separator, the separator includes a plurality of separator units 3, the separator units 3 being U-shaped to match the shapes of the positive electrode and the negative electrode, the positive electrode, separator units 3 and the negative electrode are stacked, the separator units 3 being disposed between the positive electrode and the negative electrode, and the positive electrode, the negative electrode and the separator are stacked to form the battery cell by a Z-shaped stacking process.

[0024] In some embodiments, the size of the separator unit 3 is larger than the size of the negative electrode sheet. Specifically, the concave area of ​​the separator unit 3 is larger than the concave area of ​​the negative electrode sheet. More preferably, when the positive electrode sheet, negative electrode sheet, and separator are stacked to form a battery cell, the distance between the circumferential edge of the separator unit 3 and the circumferential edge of the negative electrode sheet is 1-3 mm, and the distance between the circumferential edge of the negative electrode sheet and the circumferential edge of the positive electrode sheet is 1-3 mm.

[0025] In some embodiments, the diaphragm is one of a polyolefin diaphragm, a ceramic-coated diaphragm, a nonwoven fabric diaphragm, and a solid electrolyte diaphragm.

[0026] An irregularly shaped battery includes a casing 4 and an irregularly shaped battery cell. The casing 4 has a U-shaped structure and includes an upper casing and a lower casing. Both the upper and lower casings are provided with U-shaped grooves, which together form a receiving cavity for accommodating the irregularly shaped battery cell. When the irregularly shaped battery cell is placed in the receiving cavity, the ends of the positive electrode tab 1 and the negative electrode tab 2 extend out of the casing 4 from both sides of the notch at the top of the U-shaped casing 4.

[0027] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0028] Furthermore, in the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0031] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. An irregularly shaped electrode sheet, characterized in that: It includes a positive electrode and a negative electrode, both of which are U-shaped. The concave ends of the positive electrode and the negative electrode are the top ends, and the two sides of the concave ends are the left top end and the right top end, respectively. The positive electrode has a positive tab at the left top end, and the negative electrode has a negative tab at the right top end.

2. The irregularly shaped electrode sheet according to claim 1, characterized in that: The concave sections of the positive and negative electrodes are symmetrical.

3. The irregularly shaped electrode sheet according to claim 1, characterized in that: The size of the negative electrode is larger than the size of the positive electrode.

4. The irregularly shaped electrode sheet according to claim 1, characterized in that: The positive electrode plate and the positive electrode tab are integrally formed, and the negative electrode plate and the negative electrode tab are integrally formed.

5. An irregularly shaped battery cell, characterized in that: The battery cell is a Z-shaped stacked battery cell, the battery cell includes a separator and a positive electrode and a negative electrode as described in any one of claims 1-4, the separator includes a plurality of separator units, the separator units are U-shaped matching the shapes of the positive electrode and the negative electrode, the positive electrode, separator units and negative electrode are stacked, and the separator units are disposed between the positive electrode and the negative electrode.

6. The irregularly shaped battery cell according to claim 5, characterized in that: The size of the separator monomer is larger than the size of the negative electrode sheet.

7. The irregularly shaped battery cell according to claim 5, characterized in that: The diaphragm is one of the following: polyolefin diaphragm, ceramic-coated diaphragm, non-woven fabric diaphragm, and solid electrolyte diaphragm.

8. An irregularly shaped battery, characterized in that: The device includes a housing and the irregularly shaped battery cell as described in claim 5. The housing has a U-shaped structure and includes an upper housing and a lower housing. Both the upper housing and the lower housing are provided with U-shaped grooves. The grooves of the upper housing and the lower housing together form a receiving cavity for accommodating the irregularly shaped battery cell.

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