Battery based on non-current-collector battery cell shaped like Chinese character'gong '

Abstract

The utility model relates to the technical field of batteries, in particular to a current collector-free bow-shaped battery cell battery, which solves the problem that the ion diffusion rate is influenced due to the fact that an electrode plate is of a plane structure in the prior art, and comprises a battery shell, and a battery cell is arranged in the battery shell; a bow-shaped channel is arranged in the battery shell, and the battery cell is attached to the side wall of the bow-shaped channel. The battery has the beneficial effects that the battery cells are arranged in the battery shell in the shape of the Chinese character'gong ', so that the specific surface area of the electrode can be increased; the electrode with high specific surface area can greatly improve the mass transfer process and greatly improve the current efficiency; the larger specific surface area can provide more active sites, so that the capacity and the performance of the battery are improved; by increasing the specific surface area of the positive electrode material, the diffusion rate of lithium ions in the positive electrode material can be improved, so that the discharge rate and the charge efficiency of the battery are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially point to a kind of arch-shaped battery based on no current collector. BACKGROUND

[0002] With the continuous progress of energy technology and the increasing diversification demand of electronic equipment on battery performance, higher requirements are put forward. Traditional lithium ion battery usually relies on metal current collector to carry active material, however, this design not only increases the weight and volume of battery, but also limits the flexibility and shape adaptability of battery. In recent years, in order to overcome these limitations, researchers have begun to explore the battery structure without current collector. The current collector-free design can significantly reduce the weight of the battery and improve the flexibility and energy density of the battery by directly coating or depositing the active material on the separator or other substrate.

[0003] The prior art patent with publication number CN117936928A discloses a preparation method of a current collector-free battery and a current collector-free battery. The current collector-free battery comprises at least one battery cell unit, the battery cell unit comprises a preset structure formed by a battery belt, the battery belt comprises a positive electrode sheet, a solid-state electrolyte film and a negative electrode sheet which are sequentially stacked and pressed, the positive electrode sheet, the solid-state electrolyte film and the negative electrode sheet are all flexible and deformable sheet structures, and the positive electrode sheet and the negative electrode sheet at the end of the battery cell unit are respectively connected with a positive electrode tab and a negative electrode tab.

[0004] The electrode sheet in the above-mentioned current collector-free battery is the core component of the battery, and its structure and performance have a decisive influence on the overall performance of the battery. The electrode sheet has a planar structure, which has certain limitations in active material distribution, proton conduction and gas diffusion. The diffusion rate of ions in the positive electrode material of the battery is reduced, which affects the discharge rate and charge rate of the battery. UTILITY MODEL CONTENTS

[0005] The utility model discloses a kind of arch-shaped battery based on no current collector, solve the problem that electrode sheet is planar planar structure in prior art, affect ion diffusion rate.

[0006] The technical scheme of the utility model is realized as follows:

[0007] The application discloses a bow-shaped cell battery without a collector, which comprises a battery shell and a cell arranged in the battery shell.

[0008] A baffle is arranged on a group of opposite side walls in the battery shell, the baffles on the two side walls are arranged in a staggered manner, and the baffles are matched with the inner wall of the battery shell to form a bow-shaped channel.

[0009] The cell comprises a diaphragm, positive and negative electrode sheets are arranged on two sides of the diaphragm respectively, and an electrolyte layer is arranged between the diaphragm and the positive electrode sheet and between the diaphragm and the negative electrode sheet. The electrolyte layer adopts stable gel electrolyte, the gel electrolyte combines amphoteric ions and lithium salt to form an electrolyte system with high stability and safety, so that the gel electrolyte can continue to work even after being punctured, and the serious safety risk existing in traditional organic liquid electrolyte and ionic liquid electrolyte is greatly reduced, and the reliability and service life of the battery under extreme conditions are fundamentally improved.

[0010] The thickness of the positive electrode sheet and the negative electrode sheet ranges from 40 to 85 mu m.

[0011] The positive electrode sheet comprises a positive electrode conductive sheet and a positive electrode active material layer, and the positive electrode active material layer is arranged between the positive electrode conductive sheet and the electrolyte layer. The positive electrode conductive sheet adopts spinel lithium manganate, and the positive electrode active material adopts a positive electrode active material with high capacity, high compaction or high voltage.

[0012] The negative electrode sheet comprises a negative electrode conductive sheet and a negative electrode active material layer, and the negative electrode active material layer is arranged between the negative electrode conductive sheet and the electrolyte layer. The negative electrode conductive sheet adopts spinel lithium titanate material, and the negative electrode active material layer adopts lithium titanate material.

[0013] The positive electrode active material layer and the negative electrode active material layer are embedded with carbon nanotubes. The carbon nanotubes can form a multi-stage pore structure in the positive electrode active material layer or the negative electrode active material layer, can reduce the diffusion resistance of lithium ions transferred from one electrode to another electrode in the charging and discharging process of the lithium ion battery, and further improve the charging and discharging performance of the battery.

[0014] The positive conductive sheet and the negative conductive sheet are respectively connected with foil tabs, and the foil tabs are connected with electrode contacts outside the battery shell.

[0015] The battery shell is a square cavity structure, and the partition plates are vertically arranged on the top wall and the bottom wall of the square cavity structure. The partition plates 9 are connected with the top wall or the bottom wall by welding, and the partition plates are arranged perpendicularly to the bottom wall or the top wall. The height of the partition plates is greater than half of the height of the square cavity structure.

[0016] The electric core is arranged in an arch-shaped structure in the battery shell, so that the specific surface area of the electrode can be increased.

[0017] 2. An electrolyte layer is arranged between the diaphragm and the electrode tab, and the electrolyte layer can keep the battery with high conductivity at low temperature, and improve the cold resistance of the battery.

[0018] 3. The carbon nanotube can form a multi-stage pore structure in the positive active material layer or the negative active material layer, so that the diffusion resistance of lithium ions transferred from one electrode to another electrode in the charging and discharging process of the lithium ion battery can be reduced, and the charging and discharging performance of the battery can be improved.

[0019] 4. The foil tab can reduce the battery internal resistance to one fifth to one tenth of the traditional internal resistance, improve the cycle performance under normal temperature, low temperature and high temperature conditions, and improve the performance of the battery during rapid charging and discharging. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor.

[0021] Figure 1 It is a schematic diagram of the arch-shaped electric core battery structure based on no current collector of the utility model;

[0022] Figure 2 Fig. 1 is a schematic view of a half section of a battery based on a no-flow collector bow-shaped cell.

[0023] In the figure: 1, battery shell, 2, cell, 3, positive electrode conductive sheet, 4, negative electrode conductive sheet, 5, positive electrode active material layer, 6, negative electrode active material layer, 7, electrolyte layer, 8, separator, 9, baffle. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0025] Embodiment 1, as shown in Figure 1 , Figure 2 A bow-shaped cell battery based on no-flow collector, as shown in Figure 1, includes a battery shell 1, and a cell 2 is arranged in the battery shell 1. The battery shell 1 is provided with a bow-shaped channel, and the cell 2 is attached to the side wall of the bow-shaped channel. The cell 2 is folded under the limiting action of the bow-shaped channel, that is, the cell 2 is arranged in the battery shell 1 in a bow shape, which can effectively increase the specific surface area of the electrode. The high specific surface area electrode can greatly improve the mass transfer process and greatly improve the current efficiency. The larger specific surface area can provide more active sites, thereby increasing the capacity and performance of the battery. By increasing the specific surface area, the diffusion rate of lithium ions in the electrode material can be increased, thereby increasing the discharge rate and charging efficiency of the battery.

[0026] Further, a set of oppositely arranged side walls in the battery shell 1 are provided with baffles 9, and the baffles 9 on the two side walls are arranged in a staggered manner. The baffles 9 cooperate with the inner wall of the battery shell 1 to form a bow-shaped channel. The baffles 9 can make the electrode completely attached to the battery shell 1, thereby increasing the electrode surface area. The battery shell 1 is a square cavity structure, and the baffles 9 are vertically arranged on the top wall and the bottom wall of the square cavity structure. The height of the baffle 9 is greater than half the height of the square cavity structure. In this embodiment, the number of baffles 9 is four, and the baffles 9 are arranged vertically to the bottom wall or the top wall, and the baffles 9 are connected to the bottom wall or the top wall by welding.

[0027] In addition, the cell folded in a bow shape also makes the distance between the positive and negative electrodes closer. The closer the distance between the positive and negative electrodes, the faster the transmission speed of electrons and ions in the battery. Smaller electrode spacing can reduce the diffusion path of electrons and ions inside the battery, thereby reducing the internal resistance and self-discharge rate of the battery and prolonging the cycle life of the battery. This also helps to reduce power consumption when achieving the same processing effect.

[0028] In embodiment 2, on the basis of embodiment 1, a bow-shaped cell battery without fluid collector is provided, the cell 2 comprises a diaphragm 8, and a positive electrode sheet and a negative electrode sheet are arranged on two sides of the diaphragm 8 respectively, and an electrolyte layer 7 is arranged between the diaphragm 8 and the positive electrode sheet and between the diaphragm 8 and the negative electrode sheet. The electrolyte layer 7 adopts a gel electrolyte, which can keep high conductivity of the battery in a low-temperature state, and improve the cold resistance of the battery; meanwhile, the gel electrolyte forms an electrolyte system with high stability and safety by combining a zwitterion and a lithium salt, which enables the battery to continue to work even after being punctured, and makes the battery have puncture-proof performance.

[0029] Further, the thickness of the positive electrode sheet and the negative electrode sheet ranges from 40 to 85 μm. The positive electrode sheet comprises a positive electrode conductive sheet 3 and a positive electrode active material layer 5, and the positive electrode active material layer 5 is arranged between the positive electrode conductive sheet 3 and the electrolyte layer 7. The positive electrode conductive sheet 3 adopts spinel lithium manganate, and the positive electrode active material layer 5 adopts a positive electrode active material with high capacity, high compaction or high voltage.

[0030] Further, the negative electrode sheet comprises a negative electrode conductive sheet 4 and a negative electrode active material layer 6, and the negative electrode active material layer 6 is arranged between the negative electrode conductive sheet 4 and the electrolyte layer 7. The negative electrode conductive sheet 4 adopts spinel lithium titanate material, and the negative electrode active material layer 6 adopts lithium titanate material.

[0031] Further, carbon nanotubes are embedded on the positive electrode active material layer 5 and the negative electrode active material layer 6. The carbon nanotubes can form a multi-stage pore structure in the positive electrode active material layer 5 or the negative electrode active material layer 6, which can reduce the diffusion resistance of lithium ions transferred from one electrode to another electrode in the charging and discharging process of the lithium ion battery, and further improve the charging and discharging performance of the battery.

[0032] Further, foil tabs are connected to the positive electrode conductive sheet 3 and the negative electrode conductive sheet 4 respectively, and the foil tabs are connected to electrode contacts outside the battery shell 1. The foil tabs are made of aluminum foil or aluminum foil by shearing, and the foil tabs can reduce the internal resistance of the battery to one fifth to one tenth of the traditional internal resistance, improve the cycle performance under normal temperature, low temperature and high temperature conditions, and improve the performance of the battery in fast charging and discharging.

[0033] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A no-fluid collector based bow cell battery comprising a battery housing (1), characterized in that, The battery shell (1) is internally provided with an electric core (2); the battery shell (1) is internally provided with an arch-shaped channel, and the electric core (2) is attached to the side wall of the arch-shaped channel.

2. The no-collector based bow cell battery of claim 1, wherein, A baffle (9) is arranged on a group of oppositely arranged side walls in the battery shell (1), the baffles (9) on the two side walls are arranged in a staggered manner, and the baffle (9) cooperates with the inner wall of the battery shell (1) to form an arch-shaped channel.

3. The no-collector based jelly-roll free electric battery according to claim 1 or 2, characterized in that, The electric core (2) comprises a diaphragm (8), the diaphragm (8) is provided with a positive electrode sheet and a negative electrode sheet on both sides, respectively, and an electrolyte layer (7) is arranged between the diaphragm (8) and the positive electrode sheet and between the diaphragm (8) and the negative electrode sheet.

4. The no-collector based bow cell battery of claim 3, wherein, The thickness of the positive electrode sheet and the negative electrode sheet is in the range of 40-85μm.

5. The no-collector based bow cell battery of claim 4, wherein, The positive electrode sheet comprises a positive electrode conductive sheet (3) and a positive electrode active material layer (5), and the positive electrode active material layer (5) is located between the positive electrode conductive sheet (3) and the electrolyte layer (7).

6. The no-collector based jelly-roll free electric battery according to claim 4 or 5, characterized in that, The negative electrode sheet comprises a negative electrode conductive sheet (4) and a negative electrode active material layer (6), and the negative electrode active material layer (6) is located between the negative electrode conductive sheet (4) and the electrolyte layer (7).

7. The no-collector based bow cell battery of claim 6, wherein, The positive electrode active material layer (5) and the negative electrode active material layer (6) are both embedded with carbon nanotubes.

8. The no-collector based bow cell battery of claim 7, wherein, The positive electrode conductive sheet (3) and the negative electrode conductive sheet (4) are respectively connected with a foil tab, and the foil tab is connected with an electrode contact point outside the battery shell (1).

9. The no-collector based jelly-roll free electric battery according to claim 2 or 8, characterized in that, The battery shell (1) is a square cavity structure, and the baffle (9) is vertically arranged on the top wall and the bottom wall of the square cavity structure.

10. The no-collector based bow cell battery of claim 9, wherein, The height of the baffle (9) is greater than half the height of the square cavity structure.

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