High-energy-density battery cell for energy storage

Abstract

The utility model provides a high energy density electrical core for energy storage, the electrical core comprises a shell and a cap, the shell and the cap form the specification shape of the electrical core, a sealed space is formed in the shell and filled with a roll core, the roll core is composed of a positive electrode base material, a negative electrode base material and a diaphragm, the positive electrode base material and the negative electrode base material are blocked by a diaphragm and are wound into a reel shape, the end part of the winding core is wrapped with a high-temperature insulating tape, the two ends of the winding core are also provided with a positive electrode confluence disc and a negative electrode confluence disc which are arranged corresponding to the polarities of the two ends of the shell, the polarity is led out from the winding core, and the winding core is respectively connected with the positive electrode confluence disc and the negative electrode confluence disc in a multi-point manner. The winding core structure is adopted, certain pressure is increased in the winding process, the density of the winding core is increased, the unit volume density is increased, in addition, the conduction circulation amount is increased by arranging the convergence disc, the consumption of internal resistance is reduced, the occupied space of the winding core in the shell is increased, and the stored energy is increased.

Description

Technical Field

[0001] The utility model relates to an improvement on the structure of an energy storage battery core, in particular to a high energy density battery core for energy storage. Background Art

[0002] Battery cells are the main components of electric energy storage devices. They can be combined to form multiple battery cell components that work together to make the energy storage device have a larger capacity and better charging and discharging performance. The battery cell in the energy storage device is the smallest unit of energy storage. With the joint work of many battery cells, the storage capacity of the energy storage device can be expanded. However, as the number of battery cells increases, the volume of the energy storage device becomes larger, and the required space and weight become larger. Therefore, it is necessary to increase the energy density of the single battery cell to achieve the purpose of reducing the overall volume. Utility Model Content

[0003] The purpose of the utility model is to overcome the above-mentioned deficiencies in the prior art and to provide a high energy density battery cell for energy storage.

[0004] The technical solution adopted by the utility model to solve the above problems is: the battery core includes a shell and a cap, the shell and the cap form the specification and shape of the battery core, the interior of the shell forms a sealed space and is filled with a winding core, the winding core is composed of a positive electrode substrate, a negative electrode substrate and a diaphragm, the positive electrode substrate and the negative electrode substrate are blocked by the diaphragm and wound to form a roll, the end of the winding core is wrapped with a high-temperature insulating tape, and the two ends of the winding core are also provided with a positive electrode busbar and a negative electrode busbar, and the polarity settings corresponding to the two ends of the shell are arranged, and the polarity is led out on the winding core, and is respectively connected to the positive electrode busbar and the negative electrode busbar at multiple points. The winding core structure is adopted, and the winding process increases a certain pressure, increases the density of the winding core, and increases the unit volume density. In addition, the conductive flow is increased by setting the busbar, and the consumption of internal resistance is reduced. The space occupied by the winding core in the shell is increased, and the energy storage is increased.

[0005] Furthermore, the positive electrode substrate and the negative electrode substrate are coated with electrochemical materials, wherein the positive electrode substrate is coated with lithium iron phosphate. The positive electrode is made of lithium iron phosphate material, which has a large energy storage density, and a material with a high gram capacity can be selected to improve the energy density per unit weight.

[0006] Furthermore, the cap and the positive busbar are connected via a tab circuit, the tab is a sheet-shaped conductive material, and the two ends of the tab are connected to the cap and the positive busbar, respectively. When the cap is in the covered state, the tab is folded. The tab is a circuit connection structure of the cap, which is convenient for installation and can also increase the area of ​​the conductive structure and improve energy storage efficiency.

[0007] Furthermore, the positive busbar and the negative busbar are flat conductor structures, which are arranged parallel to the end surface of the winding core, and have multiple welding holes on their surfaces, and the welding holes are connected to the power supply structure. The busbar is a flat structure, which occupies a small space in the battery cell and effectively increases the current and the power density of the battery cell.

[0008] Furthermore, the outer part of the core is extended by the separator and circumferentially surrounds the outer side of the positive electrode substrate and the negative electrode substrate to form the outer layer of the core, and is fixed by the end tape, and the core as a whole is filled and fixed in the inner wall of the shell. The core is tightly filled in the shell, increasing the density in the unit space, improving the energy density of the battery cell, and effectively improving the density of energy storage.

[0009] Compared with the prior art, the utility model has the following advantages and effects: the design is an improvement on the battery cell structure for energy storage equipment. The battery cell of the design has better energy density per unit volume and better charging and discharging efficiency, which can save energy storage space and improve the power supply efficiency of the energy storage equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the internal cross-sectional structure of the battery cell.

[0011] Figure 2 It is a schematic diagram of the external structure of the battery cell.

[0012] In the figure: 1. Shell, 2. Cover cap, 3. Winding core, 4. High temperature insulating tape, 5. Positive busbar, 6. Negative busbar, 7. Tab, 8. Termination tape. DETAILED DESCRIPTION

[0013] The present invention will be further described in detail below with reference to the accompanying drawings and through examples. The following examples are provided to explain the present invention, but the present invention is not limited to the following examples.

[0014] A high energy density battery cell for energy storage, the battery cell comprises a shell 1 and a cap 2, the shell 1 and the cap 2 form the specification and appearance of the battery cell, the interior of the shell 1 forms a sealed space and is filled with a winding core 3, the winding core 3 is composed of a positive electrode substrate, a negative electrode substrate and a diaphragm, the positive electrode substrate and the negative electrode substrate are blocked by the diaphragm and wound into a roll shape, the end of the winding core 3 is wrapped with a high temperature insulating tape 4, the two ends of the winding core 3 are also provided with a positive electrode busbar 5 and a negative electrode busbar 6, and are arranged corresponding to the polarity of the two ends of the shell 1, the winding core 3 has polarity lead-out, and is respectively connected to the positive electrode busbar 5 and the negative electrode busbar 6 at multiple points.

[0015] The positive electrode substrate and the negative electrode substrate are both coated with electrochemical materials, wherein the positive electrode substrate is coated with lithium iron phosphate.

[0016] The cap 2 and the positive busbar 5 are connected in circuit via a tab 7. The tab 7 is a sheet-like conductive material and is connected to the cap 2 and the positive busbar 5 at both ends. When the cap 2 is in the covered state, the tab 7 is folded.

[0017] The positive electrode busbar 5 and the negative electrode busbar 6 are flat conductor structures, which are arranged parallel to the end surface of the winding core 3, and have a plurality of welding holes on their surfaces, to which the power-on structures are connected.

[0018] The outside of the winding core 3 is extended by the diaphragm and circumferentially surrounds the outside of the positive electrode substrate and the negative electrode substrate to form the outer layer of the winding core 3, and is fixed by the termination tape 8. The winding core 3 is integrally fitted to the inner wall of the shell and filled and fixed.

[0019] It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary rather than restrictive. The scope of the present invention is defined by the claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim involved.

[0020] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A high-energy density battery cell for energy storage, characterized in that: The battery cell comprises a shell (1) and a cap (2), wherein the shell (1) and the cap (2) form the specification and appearance of the battery cell, the shell (1) forms a sealed space inside and is filled with a winding core (3), wherein the winding core (3) is composed of a positive electrode substrate, a negative electrode substrate and a separator, wherein the positive electrode substrate and the negative electrode substrate are blocked by the separator and wound to form a roll shape, the end of the winding core (3) is wrapped with a high-temperature insulating tape (4), and positive electrode busbars (5) are also arranged at both ends of the winding core (3). ) and a negative busbar (6), and are arranged corresponding to the polarity of the two ends of the shell (1); polarity is led out on the winding core (3), and is respectively connected to the positive busbar (5) and the negative busbar (6) at multiple points; the cap (2) and the positive busbar (5) are connected in a circuit via a tab (7); the tab (7) is a sheet-shaped conductive material, and is respectively connected to the cap (2) and the positive busbar (5) at both ends; when the cap (2) is in a covered state, the tab (7) is folded.

2. The high energy density battery cell for energy storage according to claim 1, characterized in that: The positive electrode substrate and the negative electrode substrate are both coated with electrochemical materials, wherein the positive electrode substrate is coated with lithium iron phosphate.

3. The high energy density battery cell for energy storage according to claim 1, characterized in that: The positive electrode busbar (5) and the negative electrode busbar (6) are flat conductor structures, which are arranged parallel to the end surface of the winding core (3), and have a plurality of welding holes on their surfaces, to which the power-on structures are connected.

4. The high energy density battery cell for energy storage according to claim 1, characterized in that: The outside of the winding core (3) is extended by the diaphragm and circumferentially surrounds the outside of the positive electrode substrate and the negative electrode substrate to form the outer layer of the winding core (3), and is fixed by the end tape (8). The winding core (3) is integrally fitted to the inner wall of the shell and filled and fixed.

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