Novel negative electrode structure of lithium thionyl chloride battery

Abstract

The utility model provides a novel negative electrode structure of a lithium thionyl chloride battery, which comprises two lithium strip layers and a current collecting strip positioned between the two lithium strip layers, and a lithium strip sheet is fixed outside one of the lithium strip layers and close to the end part; according to the utility model, the design structure is simple, and a three-layer lithium sheet structure is formed at the end part by adopting a mode of adding the lithium battery sheet at the end part on the basis of a traditional double-layer lithium sheet, so that redundant positive electrodes at a roll core can fully react, the utilization rate of the positive electrodes is improved, the capacity of the battery is further improved, and the product performance is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery negative electrode structure design, and in particular relates to a new negative electrode structure of a lithium-ion battery. Background Art

[0002] Lithium thionyl chloride batteries have the advantages of high specific energy, stable operating voltage, wide operating temperature range, and long life. In particular, power batteries can achieve large current discharge. Among them, the negative electrode is an important component of the battery cell, and its molding structure has a crucial impact on the performance of the battery cell, such as the load platform and capacity. At present, the negative electrode structure uses a double-layer lithium sheet with a current collector wrapped in the middle. Its structure makes the utilization rate of the positive and negative electrodes low, which restricts the improvement of product performance. The reason is: Figure 3 As shown, double-layer lithium sheets are commonly overlapped and a current collector is wrapped in the middle. When winding with the positive electrode, the positive electrode is pre-wound one and a half turns first. In this way, there are one and a half turns of excess positive electrode in the winding core. Excessive positive electrode will cause waste and will also have a certain impact on the discharge performance of the battery, thus causing low battery utilization and restricting the improvement of product performance. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a new negative electrode structure of a lithium-substrate battery, which has a simple design structure. On the basis of a traditional double-layer lithium sheet, a lithium strip sheet is added to the end thereof, so that a three-layer lithium sheet structure is formed at the end position, thereby facilitating the positive electrode pre-wound one and a half turns at the winding core to achieve full reaction, thereby improving the utilization rate of the positive electrode, thereby increasing the capacity of the battery and improving product performance.

[0004] The technical solution adopted by the utility model is: a new negative electrode structure of a lithium-ion battery, comprising two lithium belt layers and a current collector located between the two lithium belt layers, and a lithium belt sheet is fixed outside one of the lithium belt layers and near the end.

[0005] The two lithium strip layers are a first lithium strip layer and a second lithium strip layer. The current collector is fixed between the first lithium strip layer and the second lithium strip layer, and one end of the current collector extends outward along the width direction of the lithium strip layer.

[0006] The lithium strip sheet is arranged at one end extending away from the current collector bar toward the outside of the lithium strip layer.

[0007] The lithium strip piece is located at the center of the lithium strip layer in the width direction.

[0008] The beneficial effects of the utility model are:

[0009] The utility model has a simple design structure. On the basis of the traditional double-layer lithium sheet, a lithium strip sheet is added to the end thereof, so that a three-layer lithium sheet structure is formed at the end position, which helps the positive electrode pre-wound one and a half turns at the winding core to achieve full reaction, improve the utilization rate of the positive electrode, and then increase the capacity of the battery, thereby improving product performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is the front view of the utility model;

[0011] Figure 2 It is a cross-sectional view of the utility model;

[0012] Figure 3 This is a diagram of the negative electrode structure in the prior art.

[0013] Markings in the figure: 1, first lithium strip layer; 2, second lithium strip layer; 3, current collector bar; 4, lithium strip sheet. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0015] like Figure 1-2 As shown, a new negative electrode structure of a lithium-ion battery comprises two lithium strip layers and a current collector bar 3 located between the two lithium strip layers, wherein the two lithium strip layers are a first lithium strip layer 1 and a second lithium strip layer 2, the current collector bar 3 is fixed at a position between the first lithium strip layer 1 and the second lithium strip layer 2, and one end of the current collector bar 3 extends outward along the width direction of the lithium strip layer. This partial structure is a negative electrode structure of a lithium-ion battery in the prior art, and the two lithium strip layers and the middle current collector bar 3 are manufactured by roll forming.

[0016] A lithium strip sheet 4 is fixed outside one of the lithium strip layers and near the end thereof. Figure 2 As shown, in this example, the lithium ribbon sheet 4 is connected to the second lithium ribbon layer 2. In addition, it can also be connected to the first lithium ribbon layer 1 according to actual needs. The lithium ribbon sheet 4 is arranged at one end extending away from the collector bar 3 to the outside of the lithium ribbon layer, that is, when the entire negative electrode is wound, one end of the lithium ribbon sheet 4 is located close to the winding core, and the lithium ribbon sheet 4 is located at the center of the width direction of the lithium ribbon layer to facilitate sufficient reaction with the positive electrode.

[0017] When the new negative electrode structure of the lithium-ion battery is used, the positive electrode and the negative electrode are wound inside the battery shell in a winding manner. When the positive electrode is wound, in order to avoid short circuit problems, the positive electrode will be pre-wound around the outer periphery of the winding core for one and a half turns, and then the negative electrode will be wound together with the positive electrode until the winding is completed. Since the extra one and a half turns of positive electrode will cause excessive waste when the battery is used, a lithium strip sheet 4 is added to the end of the double-layer lithium sheet of the traditional negative electrode, which can be used for the full reaction of the extra positive electrode, thereby improving the utilization rate of the positive electrode and further improving the battery capacity.

[0018] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A novel negative electrode structure of a lithium-ion battery, comprising two lithium strip layers and a current collector located between the two lithium strip layers, characterized in that: A lithium ribbon sheet is fixed outside one of the lithium ribbon layers and near the end thereof.

2. A novel negative electrode structure of a lithium-ion battery according to claim 1, characterized in that: The two lithium strip layers are a first lithium strip layer and a second lithium strip layer. The current collector is fixed between the first lithium strip layer and the second lithium strip layer, and one end of the current collector extends outward along the width direction of the lithium strip layer.

3. A novel negative electrode structure of a lithium-ion battery according to claim 2, characterized in that: The lithium strip sheet is arranged at one end extending away from the current collecting bar toward the outside of the lithium strip layer.

4. The novel negative electrode structure of a lithium-ion battery according to claim 1, characterized in that: The lithium ribbon sheet is located at the center of the lithium ribbon layer in the width direction.

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