Lithium sub-power battery negative electrode structure

Abstract

The utility model belongs to lithium sub -power type battery technical field discloses a kind of lithium sub -power type battery negative electrode structure, including upper and lower two negative electrode lithium strips, one layer nickel strip current collector bar and one layer nickel hole current collector net are fixedly arranged between two negative electrode lithium strips;The utility model connects with nickel hole current collector net when the interlayer structure of negative electrode lithium strip-nickel strip current collector bar-nickel hole current collector net-negative electrode lithium strip can also guarantee when breaking down due to the consumption of reaction at the time of reaction to end time;Nickel strip current collector bar and nickel hole current collector net between using spot welding mode connection, nickel strip current collector bar and nickel hole current collector net are pressed together with lithium strip using roll pressing mode, guarantee the firm reliable connection and sufficient contact between both, effectively improve the utilization of negative electrode active material, the load output ability and the safety performance after battery discharge of battery.

Description

Technical Field

[0001] This utility model belongs to the field of lithium-ion power battery technology, specifically relating to a negative electrode structure for lithium-ion power batteries. Background Technology

[0002] Lithium thionyl chloride (LTC) batteries, also known as lithium-thionyl chloride batteries, are a type of primary battery. They are currently the commercially available lithium batteries with the highest energy density and the widest operating temperature range. Due to their long storage life, they are mainly used as backup power for storage devices and in other applications requiring long operating life. Structurally, LTC batteries are divided into two types: energy type and power type. Energy type batteries have the advantages of higher battery capacity and higher safety, while power type batteries have the advantage of higher load output capability.

[0003] The existing structure of lithium-ion power batteries is a wound structure, where the positive electrode, negative electrode, and separator are wound together to form the cell. Current negative electrode technology involves two layers of lithium strips wrapped around a current collector and rolled into a negative electrode sheet. The width of the lithium strips in conventional products is between 35mm and 45mm, while the width of the current collector is typically 4mm, resulting in poor current collection efficiency and failing to fully realize the high-power output characteristics of power batteries. With this negative electrode structure, as discharge progresses, especially towards the end of discharge, the lithium strips may thin or even break due to the consumption of the active material. If the lithium strip breaks, it will affect the battery capacity. Due to the chemical properties of metallic lithium, the residual lithium inside the battery at the end of discharge is an unstable factor and poses a safety hazard. Therefore, a new negative electrode structure that can meet the requirements of high power output while ensuring sufficient reaction of the active material is crucial for the electrical performance and safety of lithium-ion power batteries. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a lithium sub-power battery negative electrode structure, which effectively improves the utilization rate of negative electrode active material, the battery's load output capacity, and the safety performance after the battery discharges.

[0005] The technical solution adopted in this utility model is: a lithium sub-power type battery negative electrode structure, including upper and lower negative electrode lithium strips, a nickel strip current collector and a nickel hole current collector are fixedly arranged between the two negative electrode lithium strips, the outer sides of the nickel strip current collector and the nickel hole current collector are respectively fixedly connected to the inner sides of the two negative electrode lithium strips, and the inner sides of the nickel strip current collector and the nickel hole current collector are fixedly connected to each other, forming a structure of negative electrode lithium strip-nickel strip current collector-nickel hole current collector-negative electrode lithium strip.

[0006] The nickel strip current collector and the nickel hole current collector are connected by spot welding.

[0007] The nickel strip current collector, the nickel hole current collector mesh, and the negative lithium strip are pressed together by roller pressing.

[0008] The width of the nickel-hole current collector is 90-98% of the width of the lithium strip, and the length of the nickel-hole current collector is 75-90% of the length of the lithium strip.

[0009] The mesh size of the nickel-plated current collector is 10-20 mesh.

[0010] The nickel strip current collector is horizontally positioned in the middle of the negative lithium strip. The distance between the top of the nickel hole current collector and the top of the negative lithium strip is equal to the distance between the bottom of the nickel hole current collector and the bottom of the negative lithium strip. The distance between the left side of the nickel hole current collector and the left side of the negative lithium strip is equal to the distance between the right side of the nickel hole current collector and the right side of the negative lithium strip.

[0011] The beneficial effects of this utility model are as follows:

[0012] This invention utilizes a sandwich structure consisting of a negative electrode lithium strip, a nickel strip current collector, a nickel hole current collector, and a negative electrode lithium strip. Even when the negative electrode lithium strip breaks due to the consumption of the reaction at the end of the reaction time, it can still maintain connection with the nickel hole current collector. The nickel strip current collector and the nickel hole current collector are connected by spot welding, ensuring a firm and reliable connection and full contact between the two. This effectively improves the utilization rate of the negative electrode active material, the battery's load output capacity, and the safety performance after the battery discharges. Attached Figure Description

[0013] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0014] Figure 2 This is a schematic diagram of the transverse structure of this utility model.

[0015] The markings in the diagram are: 1. Lithium negative electrode strip; 2. Nickel strip current collector; 3. Nickel hole current collector. Detailed Implementation

[0016] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.

[0017] like Figure 1 and Figure 2As shown, a lithium sub-power battery negative electrode structure includes two layers of negative electrode lithium strips 1. A nickel strip current collector 2 and a nickel hole current collector 3 are fixedly disposed between the two layers of negative electrode lithium strips 1. The outer sides of the nickel strip current collector 2 and the nickel hole current collector 3 are respectively fixedly connected to the inner sides of the two layers of negative electrode lithium strips 1. The inner sides of the nickel strip current collector 2 and the nickel hole current collector 3 are fixedly connected to each other, forming a structure of negative electrode lithium strip 1-nickel strip current collector 2-nickel hole current collector 3-negative electrode lithium strip 1. The nickel strip current collector 2 is horizontally disposed in the middle position of the negative electrode lithium strip 1. The distance between the top of the nickel hole current collector 3 and the top of the negative electrode lithium strip 1 is equal to the distance between the bottom of the nickel hole current collector 3 and the bottom of the negative electrode lithium strip 1. The distance between the left side of the nickel hole current collector 3 and the left side of the negative electrode lithium strip 1 is equal to the distance between the right side of the nickel hole current collector 3 and the right side of the negative electrode lithium strip 1. The distance between the edges; the width of the nickel-hole current collector 3 is 95% of the width of the lithium strip, the length of the nickel-hole current collector 3 is 85% of the length of the lithium strip, and the mesh size of the nickel-hole current collector 3 is 15 mesh. Finally, from top to bottom, a structure is formed of negative electrode lithium strip 1 - nickel strip current collector 2 - nickel-hole current collector 3 - negative electrode lithium strip 1. The negative electrode sheet is made by roll forming and participates in the manufacturing of lithium sub-power batteries. When the battery reaction reaches the end time, even if the negative electrode lithium strip 1 breaks due to the consumption of the reaction, it can still be connected to the nickel-hole current collector 3. The nickel strip current collector 2 and the nickel-hole current collector 3 are connected by spot welding, which ensures a firm and reliable connection and full contact between the two, effectively improving the utilization rate of the negative electrode active material, the load output capacity of the battery, and the safety performance after the battery discharges.

Claims

1. A lithium sub-power battery negative electrode structure, characterized in that: It includes two negative lithium strips (1) with upper and lower layers. A nickel strip current collector (2) and a nickel hole current collector (3) are fixedly arranged between the two negative lithium strips (1). The outer sides of the nickel strip current collector (2) and the nickel hole current collector (3) are respectively fixedly connected to the inner sides of the two negative lithium strips (1). The inner sides of the nickel strip current collector (2) and the nickel hole current collector (3) are fixedly connected to each other, forming a structure of negative lithium strip (1) - nickel strip current collector (2) - nickel hole current collector (3) - negative lithium strip (1).

2. The lithium sub-power battery negative electrode structure according to claim 1, characterized in that: The nickel strip current collector (2) and the nickel hole current collector (3) are connected by spot welding.

3. The lithium sub-power battery negative electrode structure according to claim 2, characterized in that: The nickel strip current collector (2), the nickel hole current collector (3) and the negative electrode lithium strip (1) are pressed together by roller pressing.

4. The lithium sub-power battery negative electrode structure according to claim 1, characterized in that: The width of the nickel hole current collector (3) is 90-98% of the width of the lithium strip, and the length of the nickel hole current collector (3) is 75-90% of the length of the lithium strip.

5. The lithium sub-power battery negative electrode structure according to claim 1, characterized in that: The mesh size of the nickel-hole current collector (3) is 10-20 mesh.

6. The lithium sub-power battery negative electrode structure according to claim 4, characterized in that: The nickel strip current collector (2) is positioned in the middle of the width direction of the negative lithium strip (1). The distance between the top of the nickel hole current collector (3) and the top of the negative lithium strip (1) is equal to the distance between the bottom of the nickel hole current collector (3) and the bottom of the negative lithium strip (1). The distance between the left side of the nickel hole current collector (3) and the left side of the negative lithium strip (1) is equal to the distance between the right side of the nickel hole current collector (3) and the right side of the negative lithium strip (1).

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