Battery pole piece, battery cell and battery

Abstract

The utility model provides a battery pole piece, battery cell and battery, battery pole piece includes: carrier part, first paste part, second paste part and third paste part, first paste part, second paste part and third paste part all cover on carrier part's two end face along the first direction, the second slurry part is arranged between the first slurry part and the third slurry part, the first slurry part covers the edge of one side of the carrier part along the second direction, and the third slurry part covers the edge of the other side of the carrier part along the second direction. The second slurry part is arranged between the first slurry part and the third slurry part, so that the mutual diffusion of the first slurry part and the third slurry part is effectively blocked, and the advantages of improving the performance and the consistency of the pole piece, improving the width identification precision of the positive electrode film area and improving the production yield are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a battery pole piece, electric core and battery. BACKGROUND

[0002] In the battery manufacturing process, there are some technical challenges in the high-speed coating process of thick coating design pole pieces. Specifically, during the drying process of the pole piece, the edge ceramic slurry will diffuse to the slurry area of the positive electrode film, causing the ceramic slurry to penetrate into the film area. This phenomenon makes it difficult for the device to accurately identify the width of the positive electrode film area, resulting in a decrease in production yield.

[0003] To solve this problem, the prior art has taken some measures. One method is to reduce the coating speed to reduce the degree of slurry diffusion. Another method is to coat ceramic slurry on the current collector in advance, and then coat the positive electrode slurry after it is dried. These methods may alleviate the problem to some extent, but still have some limitations.

[0004] The method of reducing the coating speed can reduce the slurry diffusion, but it also reduces the production efficiency, which is not conducive to large-scale production. The method of coating ceramic slurry on the current collector in advance can reduce the diffusion of ceramic slurry to the positive electrode film area, but it increases the production process, and increases the production cost and complexity.

[0005] In addition, these methods do not fundamentally solve the problem of slurry diffusion, and still have a certain degree of diffusion risk, which may affect the performance and consistency of the pole piece. At the same time, these methods also fail to effectively improve the identification accuracy of the width of the positive electrode film area, and still have the problem of low production yield.

[0006] To solve the above problems, a battery pole piece, an electric core and a battery are proposed. SUMMARY

[0007] The utility model aims at providing a battery pole piece, an electric core and a battery, which have the advantages of improving production efficiency, reducing production cost, reducing slurry diffusion, improving pole piece performance and consistency, improving positive electrode film area width identification accuracy, and improving production yield.

[0008] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0009] The battery pole piece according to the embodiment of the utility model, comprising: carrier part, first slurry part, second slurry part and third slurry part, first slurry part, second slurry part and third slurry part all cover on two end faces of carrier part opposite along first direction, wherein, along second direction perpendicular to first direction, second slurry part is arranged between first slurry part and third slurry part, first slurry part covers to one side edge of carrier part along second direction, third slurry part covers to another side edge close to carrier part along second direction.

[0010] In addition, the battery pole piece according to the above embodiment of the utility model can also have the following additional technical features:

[0011] In some embodiments of the utility model, the first slurry part is a slurry layer formed by positive electrode diaphragm slurry.

[0012] In some embodiments of the utility model, the second slurry part is a slurry layer formed by oil-based ceramic slurry.

[0013] In some embodiments of the utility model, the third slurry part is a slurry layer formed by water-based ceramic slurry.

[0014] In some embodiments of the utility model, the length d1 of the second slurry part along the second direction satisfies: 12mm >= d1 >= 3mm, and the height h1 along the third direction perpendicular to the first direction and the second direction satisfies: 40um >= h1 >= 10um.

[0015] In some embodiments of the utility model, the length d2 of the third slurry part along the second direction satisfies: 12mm >= d2 >= 3mm, and the height h2 along the third direction perpendicular to the first direction and the second direction satisfies: 40um >= h2 >= 10um.

[0016] In some embodiments of the utility model, the carrier part is set as an aluminum film.

[0017] The utility model also provides a kind of electric core, and the electric core includes above-mentioned battery pole piece.

[0018] The utility model also provides a kind of battery, and the battery includes above-mentioned electric core.

[0019] Compared with prior art, the utility model at least has the following beneficial effects:

[0020] By arranging the second slurry part between the first slurry part and the third slurry part, the mutual diffusion of the first slurry part and the third slurry part is effectively blocked, thereby solving the problem of slurry diffusion, and having the advantages of improving production efficiency, reducing production cost, reducing slurry diffusion, improving the performance and consistency of the pole piece, improving the recognition accuracy of the positive electrode film piece area width, and improving the production yield.

[0021] Additional aspects and advantages of the present application will be set forth in part in the following description, and in part will become apparent to those skilled in the art upon examination of the following description, or can be learned by the practice of the application. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 A top view of a battery pole piece of an embodiment of the present application;

[0023] Figure 2 A side view of a battery pole piece of an embodiment of the present application.

[0024] REFERENCE NUMERALS

[0025] 1, carrier part; 11, tab part; 2, third slurry part; 3, second slurry part; 4, first slurry part. DETAILED DESCRIPTION

[0026] A battery pole piece, a battery cell and a battery of the present application will be described in more detail below with reference to the drawings, in which a preferred embodiment of the present application is shown, it should be understood that those skilled in the art can modify the present application described herein while still achieving the advantageous effects of the present application. Therefore, the following description should be understood as extensive knowledge for those skilled in the art, and not as a limitation on the present application.

[0027] In the description of the present application, "one embodiment" or "some embodiments" means that the specific features, structures or characteristics described in connection with the embodiment are included in one or more embodiments of the present application. Therefore, the statements "in one embodiment", "in some embodiments", "in other some embodiments", "in further some embodiments" and the like appearing in different places in the present application do not necessarily all refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized.

[0028] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, in which the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation on the present application.

[0029] The following description will be made with reference to Figure 1 ,Figure 2 This invention describes battery electrode sheets according to embodiments of the present invention.

[0030] According to the battery electrode sheet of the embodiment of this utility model, such as Figure 1 , Figure 2 As shown, it includes: a carrier section 1, a first slurry section 4, a second slurry section 3, and a third slurry section 2, wherein the first slurry section 4, the second slurry section 3, and the third slurry section 2 are all along a first direction (e.g., Figure 1 The X direction (as shown) covers the two opposite surfaces of the carrier portion 1, wherein, along the second direction perpendicular to the first direction (e.g., Figure 1 (as shown in the Y direction), the second slurry section 3 is disposed between the first slurry section 4 and the third slurry section 2, the first slurry section 4 covers one edge of the carrier section 1 along the second direction, and the third slurry section 2 covers the other side of the carrier section 1 along the second direction.

[0031] Specifically, the carrier portion 1 can be made of aluminum film as a supporting structure, providing a basis for slurry coating. The first slurry portion 4 can be configured as a positive electrode film slurry, covering one edge of the carrier portion 1 to ensure the width stability of the positive electrode film area. The second slurry portion 3 can be configured as an oil-based ceramic slurry, located between the first slurry portion 4 and the third slurry portion 2, serving as an isolation layer to prevent the ceramic slurry from diffusing into the positive electrode film area. The third slurry portion 2 can be configured as an aqueous ceramic slurry, located near the other side of the carrier portion 1, further enhancing edge stability.

[0032] The carrier portion 1 includes an electrode tab 11, which is disposed at one end of the carrier portion 1 along the second direction. Specifically, the electrode tab 11 is the portion of the carrier portion 1 not covered by the first slurry portion 4, the second slurry portion 3, and the third slurry portion 2. More specifically, one end of the first slurry portion 4 extends along the second direction to one edge of the carrier portion 1, and the other end extends to one end of the second slurry portion 3. The second slurry portion 3 extends along the second direction to one end of the third slurry portion 2, and the third slurry portion 2 extends along the second direction to the electrode tab 11.

[0033] The first slurry section 4, the second slurry section 3, and the third slurry section 2 extend along the first direction to both ends of the carrier section 1.

[0034] In a preferred embodiment, the length d1 of the second slurry portion 3 along the second direction satisfies 12mm ≥ d1 ≥ 3mm, and along a third direction perpendicular to the first and second directions (e.g., Figure 2The height h1 of the second slurry part 3 along the second direction (as shown in the Z direction) satisfies 40um≥h1≥10um. Further, the length d2 of the second slurry part 3 along the second direction (as shown in the Z direction) satisfies 12mm≥d2≥3mm, and the height h2 of the third slurry part 2 along the third direction (as shown in the Z direction) perpendicular to the first direction and the second direction satisfies 40um≥h2≥10um. Figure 2 The height h1 of the second slurry part 3 along the second direction (as shown in the Z direction) satisfies 40um≥h1≥10um. Further, the length d2 of the second slurry part 3 along the second direction (as shown in the Z direction) satisfies 12mm≥d2≥3mm, and the height h2 of the third slurry part 2 along the third direction (as shown in the Z direction) perpendicular to the first direction and the second direction satisfies 40um≥h2≥10um.

[0035] The first slurry part 4, the second slurry part 3 and the third slurry part 2 on both sides of the carrier part 1 are symmetrically arranged.

[0036] That is, by arranging the carrier part 1 and the specific arrangement of the three slurries, the problem of the edge ceramic slurry of the battery pole piece diffusing to the positive film piece area during the coating process is solved. The carrier part 1 serves as a support structure and provides the basis for slurry coating. The first slurry part 4 covers one side edge of the carrier part 1, ensuring the stability of the width of the positive film piece area. The second slurry part 3 is located between the first slurry part 4 and the third slurry part 2, which plays a role of isolation and prevents the diffusion of ceramic slurry to the positive film piece area. The third slurry part 2 is close to the other side edge of the carrier part 1, further enhancing the stability of the edge. Through this arrangement, the three slurries cooperate with each other to ensure the stability of the width of the positive film piece area and improve the production yield. Compared with the prior art, the technical scheme of the utility model effectively prevents the diffusion of ceramic slurry during the coating process and improves the production yield, which has obvious advantages.

[0037] As shown in the drawings, Figure 1 As shown in the drawings, in some embodiments of the utility model, the first slurry part 4 is arranged as a positive film piece slurry. This arrangement ensures the efficiency and reliability of the battery pole piece in the electrochemical reaction, and solves the problem of energy storage of the battery pole piece by covering the positive film piece slurry to one side edge of the carrier part 1.

[0038] As a preferred embodiment, the positive film piece slurry can be uniformly covered on one side edge of the carrier part 1 through a coating process. Specifically, the coating process can adopt a doctor blade coating, a roller coating or a spraying method, etc. to ensure the uniform distribution and thickness control of the slurry. Further, the drying process of the slurry can be realized by hot air drying or infrared drying to ensure the stable adhesion of the slurry on the carrier part 1.

[0039] That is, by explicitly setting the first slurry part 4 as the positive electrode film slurry, the problem of edge ceramic slurry diffusion to the positive electrode film area during high-speed coating of the battery electrode sheet is effectively solved. For example, the positive electrode film slurry can be set as one of NCM, LFP or lithium cobaltate and PVDF, conductive carbon, NMP. Compared with the prior art, the technical scheme not only improves the production yield of the battery electrode sheet, but also ensures the performance and stability of the battery electrode sheet. Through this setting, the positive electrode film slurry can effectively cover the one side edge of the carrier part 1, avoiding the penetration of ceramic slurry into the film area, thereby ensuring the efficiency and reliability of the battery electrode sheet in the electrochemical reaction.

[0040] As shown in Figure 1 In some embodiments of the present application, the second slurry part 3 is set as an oil-based ceramic slurry, which commonly includes, for example, alumina, PVDF and NMP. Among them, alumina as a ceramic material provides good insulation and mechanical strength; PVDF as an adhesive enhances the adhesion and stability of the slurry; NMP as a solvent ensures uniform coating and good flowability of the slurry. The synergistic effect of these components enables the second slurry part 3 to effectively isolate the first slurry part 4 and the third slurry part 2 in the battery electrode sheet, preventing mutual penetration between the slurries, thereby improving the production yield and performance stability of the battery electrode sheet.

[0041] Specifically, the addition amount of alumina can be adjusted according to actual needs, usually between 10% and 30%, to ensure that the slurry has sufficient insulation and mechanical strength. The addition amount of PVDF can be adjusted according to the viscosity and adhesion requirements of the slurry, usually between 5% and 15%. The addition amount of NMP is adjusted according to the flowability and coating performance of the slurry, usually between 50% and 70%. As a preferred embodiment, the addition amount of alumina is 20%, the addition amount of PVDF is 10%, and the addition amount of NMP is 60%.

[0042] It can be understood that the composition of the above-mentioned oil-based ceramic slurry is familiar to those skilled in the art, and the present application does not particularly limit it, and those skilled in the art can use mature products on the market.

[0043] Therefore, the technical scheme of the present application effectively solves the technical problems of the specific composition and performance requirements of the second slurry part 3 in the battery electrode sheet by using oil-based ceramic slurry. Compared with the prior art, the technical scheme of the present application has better slurry isolation effect, which can significantly improve the production yield and performance stability of the battery electrode sheet.

[0044] In some embodiments of the utility model, the third slurry part 2 is provided as water-based ceramic slurry, including: alumina, acrylic ester copolymer, water. Among them, alumina as main ingredient, provided the hardness and wear resistance of slurry, acrylic ester copolymer as binder, enhanced the adhesion and stability of slurry, water as solvent, make slurry easy to coat and dry. Specifically, the particle size of alumina can be selected between 0.1 microns to 10 microns, the content of acrylic ester copolymer can be between 1% to 10%, the content of water can be between 50% to 90%. As a preferred implementation, the particle size of alumina is 1 microns, the content of acrylic ester copolymer is 5%, and the content of water is 70%.

[0045] It can be understood that the composition of the above water-based ceramic slurry is familiar to those skilled in the art, and the utility model does not particularly limit it, and those skilled in the art can use mature products on the market.

[0046] Through this technical means, the coating process of the slurry can be effectively controlled, and the production quality and consistency of the battery pole piece are improved. Specifically, the hardness and wear resistance of alumina ensure the uniform distribution and good adhesion of the slurry on the carrier part 1, the adhesive effect of acrylic ester copolymer enhances the stability of the slurry, and the solvent effect of water makes the slurry easy to coat and dry. Therefore, the application problem of water-based ceramic slurry in the battery pole piece is solved, the diffusion of the slurry to the positive film area during the drying process is avoided, and the production yield is improved. Compared with the prior art, the technical scheme of the utility model has better coating uniformity and adhesion, and can effectively improve the production quality and consistency of the battery pole piece.

[0047] In some embodiments of the utility model, the length d1 of the second slurry part 3 along the second direction satisfies: 12mm≥d1≥3mm, and the height h1 along the third direction perpendicular to the first direction and the second direction satisfies: 40μm≥h1≥10μm.

[0048] Specifically, the length d1 of the second slurry part 3 in the second direction is controlled between 12mm to 3mm, which helps to ensure the uniform distribution of the slurry on the carrier part 1, and avoid uneven coating or functional failure caused by too long or too short. At the same time, the height h1 in the third direction is controlled between 40μm to 10μm, which helps to ensure that the thickness of the slurry is moderate, neither too thick to affect the battery performance, nor too thin to cause insufficient function. By accurately controlling the length and height of the second slurry part 3, the production quality and performance stability of the battery pole piece can be effectively improved.

[0049] As a preferred embodiment, the length d1 of the second slurry part 3 can be achieved by adjusting the coating width of the coating device, specifically, the length of the slurry can be controlled by adjusting the width of the coating head or the coating speed. The height h1 can be achieved by adjusting the coating thickness or the coating pressure, for example, the thickness of the slurry can be controlled by adjusting the gap of the coating roller or the coating pressure.

[0050] Therefore, the technical scheme of the utility model solves the size control problem of the second slurry part 3 in the second direction and the third direction by accurately controlling the length and height of the second slurry part 3, and ensures the functionality and stability of the battery pole piece. Compared with the prior art, the technical scheme of the utility model not only improves the production quality of the battery pole piece, but also improves the stability of the battery performance, and avoids the problem of reducing the production yield caused by improper size control of the slurry.

[0051] In some embodiments of the utility model, the length d2 of the third slurry part 2 along the second direction satisfies: 12mm >= d2 >= 3mm, and the height h2 along the third direction perpendicular to the first direction and the second direction satisfies: 40um >= h2 >= 10um.

[0052] Specifically, the length d2 of the third slurry part 2 in the second direction is limited to between 3mm and 12mm, and this range is selected to ensure that the slurry can be uniformly distributed during the coating process, avoiding the problem of uneven coating caused by excessive length or insufficient length. The height h2 in the third direction is limited to between 10um and 40um, and the control of this height helps to prevent excessive diffusion of the slurry during drying, thereby maintaining the clear boundary and functional integrity of the positive electrode film area.

[0053] Therefore, by accurately controlling the length and height of the third slurry part 2, the production yield can be effectively improved, and the production defects caused by slurry diffusion can be reduced. Compared with the prior art, the technical scheme of the utility model can better control the distribution and thickness of the slurry during the coating and drying process, thereby ensuring the functionality and stability of the battery pole piece.

[0054] In some embodiments of the utility model, the carrier part 1 is provided as an aluminum film. As the material of the carrier part 1, the aluminum film has excellent electrical conductivity and mechanical strength, which can effectively support and conduct current, and its good thermal stability helps to maintain the stability of the pole piece during battery operation. Specifically, the aluminum film can be prepared by rolling process, and the thickness is usually between 10um and 50um to ensure the balance of its mechanical strength and electrical conductivity. As a preferred embodiment, the surface of the aluminum film can be chemically treated or coated to enhance its adhesion to the slurry and corrosion resistance.

[0055] By using an aluminum film as the carrier part 1, the overall performance and reliability of the battery electrode sheet can be significantly improved. The high electrical conductivity of the aluminum film helps to reduce the internal resistance of the battery and improve the charge and discharge efficiency of the battery. The good mechanical strength of the aluminum film can effectively support the electrode sheet structure and prevent deformation or breakage during battery operation. In addition, the thermal stability of the aluminum film helps to maintain the stability of the electrode sheet in a high temperature environment and prolong the service life of the battery. Compared with the prior art, the technical solution of the utility model has obvious advantages in optimizing the performance of the battery electrode sheet, especially in improving the electrical conductivity, mechanical strength and thermal stability.

[0056] The utility model also provides a kind of electric core, and the electric core includes above-mentioned battery electrode sheet.

[0057] Specifically, by referring to the structural design of the above-mentioned battery electrode sheet, the stability and performance of the battery electrode sheet in the electric core are ensured. This design solves the technical problem of the structural design of the battery electrode sheet in the electric core by a specific slurry covering direction and position, and improves the yield of the electric core. Compared with the prior art, the technical solution of the utility model can effectively prevent the diffusion of ceramic slurry to the positive film area during the drying process, thereby avoiding the problem that the width of the positive film area is difficult to be accurately identified by the equipment, and further improving the production yield.

[0058] The utility model also provides a kind of battery, and the battery includes above-mentioned electric core.

[0059] That is, the technical solution of the utility model effectively solves the technical problem that the edge ceramic slurry of the battery electrode sheet diffuses to the positive film area during high-speed coating, which leads to the difficulty of accurately identifying the width of the positive film area by the equipment, thereby reducing the production yield. Compared with the prior art, the utility model significantly improves the production yield by optimizing the distribution of slurry and material selection, and has obvious technical advantages.

[0060] Among them, the battery of the utility model is an alkali metal ion secondary battery, for example, the battery can be a lithium ion battery, a sodium ion battery or a potassium ion battery, and the battery can also be set as other alkali metal ion secondary batteries that can realize the above functions, which will not be described one by one here.

[0061] It should be understood that the above specific embodiments of the utility model are only used for illustrative or explanatory purposes of the principles of the utility model, and do not constitute a limitation on the utility model. Therefore, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the utility model shall be included in the protection scope of the utility model. In addition, the appended claims of the utility model are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A battery pole piece, characterized in that, Comprising: a carrier portion, a first paste portion, a second paste portion, and a third paste portion, the first paste portion, the second paste portion, and the third paste portion are all covered on opposite two end faces of the carrier portion along a first direction, wherein along a second direction perpendicular to the first direction, the second paste portion is provided between the first paste portion and the third paste portion, the first paste portion covers to one side edge of the carrier portion along the second direction, and the third paste portion covers to the other side edge of the carrier portion along the second direction.

2. The battery pole piece of claim 1, wherein, The first paste portion is a paste layer formed by a positive electrode film paste.

3. The battery pole piece of claim 1, wherein, The second paste portion is a paste layer formed by an oil-based ceramic paste.

4. The battery pole piece of claim 1, wherein, The third paste portion is a paste layer formed by a water-based ceramic paste.

5. The battery pole piece of claim 1, wherein, A length d1 of the second paste portion along the second direction satisfies: 12mm≥d1≥3mm, and a height h1 along a third direction perpendicular to the first direction and the second direction satisfies: 40μm≥h1≥10μm.

6. The battery pole piece of claim 1, wherein, A length d2 of the third paste portion along the second direction satisfies: 12mm≥d2≥3mm, and a height h2 along a third direction perpendicular to the first direction and the second direction satisfies: 40μm≥h2≥10μm.

7. The battery pole piece of claim 1, wherein, The carrier portion is provided as an aluminum thin film.

8. An electric cell characterized by A battery pole piece comprising any one of claims 1 to 7.

9. A battery, characterized by An electric core comprising claim 8.

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