Square shell battery with soaking structure

Abstract

The utility model discloses a square shell battery with a soaking structure, which comprises two stacked cores and a soaking mechanism arranged between the two stacked cores and used for conducting heat, the soaking mechanism comprises at least one layer of soaking sheet, and the soaking sheet is of a latticed metal heat conducting structure. According to the square shell battery with the soaking structure provided by the utility model, the soaking mechanism is arranged between the two stacked cores and is pressed and fixed to form a complete battery cell monomer, and when the battery cell is in a negative-pressure air exhaust process, the net-shaped structure provides a gas exhaust channel, so that the rapid air exhaust of the battery cell is realized, and the production efficiency is accelerated; in the cycle process of the battery, when temperature difference occurs in the two stacked cores due to non-uniform heat production, the temperature balance in the battery can be realized through the quick heat conduction effect of the soaking mechanism, and the normal use of the battery is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially a kind of square can battery with uniform heating structure. BACKGROUND

[0002] Square can battery has become the most mainstream battery packaging mode at present due to its good appearance size consistency, high pressure strength, long cycle life and other advantages, and is widely applied in power battery, energy storage battery and other fields.

[0003] Current mainstream square can battery is mainly ternary or lithium iron phosphate lithium battery, and the next generation development direction is concentrated in sodium ion battery field. With the increasing requirement of large capacity and long cycle for square can battery, exhaust problem in large-size cell production process and temperature rise uneven problem in cycle process seriously affect the cycle performance of battery. SUMMARY

[0004] To solve the above technical problems, the utility model provides a kind of square can battery with uniform heating structure, for the temperature distribution uneven in the cycle process of large-size cell, with the mode of fast heat conduction to adjust cell temperature, improve the cycle performance of battery.

[0005] The technical scheme provided by the utility model is as follows:

[0006] A kind of square can battery with uniform heating structure, including two stacked cores and the uniform heating mechanism for heat conduction between two stacked cores.

[0007] Preferably, the uniform heating mechanism includes at least one uniform heating sheet, and the uniform heating sheet is a grid-shaped metal heat conduction structure.

[0008] Preferably, the thickness of the uniform heating sheet is 0.1-1mm.

[0009] Preferably, the uniform heating sheet includes several grids, and the width of each grid is 1-10mm.

[0010] Preferably, the width of the stacked core is 150-300mm, and the length of the stacked core is 500-1000mm.

[0011] Preferably, the size of the uniform heating mechanism is not greater than the size of the stacked core.

[0012] The utility model has the following advantages compared with prior art:

[0013] The prismatic battery with a heat-equalizing structure of this application places the heat-equalizing mechanism between two stacked cores and presses them together to form a complete cell. During the negative pressure venting process, the mesh structure provides a gas exhaust channel, enabling rapid venting and accelerating production efficiency. During battery cycling, when uneven heat generation between the two stacked cores leads to internal temperature differences, the rapid heat conduction of the heat-equalizing mechanism helps to balance the internal temperature of the battery, ensuring normal battery operation. Therefore, the prismatic battery with a heat-equalizing structure of this application has advantages such as reducing the difficulty of internal venting of the cell, extending the life of the negative pressure equipment, reducing venting energy consumption, saving costs, improving cell interface quality, and increasing the cell's cycle life. Furthermore, the prismatic battery with a heat-equalizing structure of this application also has the advantages of easy modification, wide applicability, and adaptability to various battery specifications. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a schematic diagram of the square-shell battery with a heat dissipation structure in an embodiment of this utility model;

[0016] Figure 2 This is a schematic diagram of the heat dissipation mechanism in an embodiment of this utility model;

[0017] Figure 3 This is a schematic diagram of the temperature test points in an embodiment of this utility model;

[0018] Figure 4 This is a temperature change graph at different points in an embodiment of this utility model.

[0019] Figure label:

[0020] 1. Stacked core; 2. Heat dissipation mechanism. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] likeFigures 1-4 As shown, this utility model embodiment provides a square-shell battery with a heat dissipation structure, including two stacked cores 1 and a heat dissipation mechanism 2 disposed between the two stacked cores 1 for heat conduction.

[0023] In this embodiment, the heat dissipation mechanism 2 includes at least one heat dissipation sheet, which is a mesh-like metal thermally conductive structure. During the negative pressure venting process of the battery cell, the mesh structure provides a gas exhaust channel, enabling rapid venting of the battery cell and accelerating production efficiency. During battery cycling, when uneven heat generation between two stacked cells leads to internal temperature differences, the rapid heat conduction of the heat dissipation mechanism 2 can achieve internal temperature balance, ensuring normal battery operation. Copper is used as the metal heat dissipation sheet substrate in lithium-ion batteries, and aluminum is used in sodium-ion batteries. This structure has the advantages of simple structure, low cost, and adaptability to various battery specifications.

[0024] In this embodiment, the thickness of the heat spreader is 0.1–1 mm. The heat spreader includes several grids, each grid having a width of 1–10 mm.

[0025] In this embodiment, the width of the core stack is 150–300 mm, and the length of the core stack is 500–1000 mm. The size of the heat spreader is not larger than the size of the core stack.

[0026] In this embodiment, for large aluminum-cased battery cells with a width of 150–300 mm and a length of 500–1000 mm, actual measurements showed that the temperature difference between the positive and negative electrode terminals and the center of the large surface area of ​​the battery cell could reach 3–10°C. After adding a heat-conducting sheet, the temperature difference at different locations on the surface of the battery cell could be reduced to less than 3°C. Under normal circumstances, large aluminum-cased battery cells with a width of 150–300 mm and a length exceeding 500–1000 mm require high negative pressure (-95 kPa) evacuation for more than 20 minutes to expel the gas inside the battery cell. Using the heat spreader in this embodiment, the negative pressure evacuation time can be reduced to less than 5 minutes, and the negative pressure value can be reduced to -80 kPa.

[0027] The prismatic battery with a heat dissipation structure in this embodiment has the following advantages:

[0028] 1) Reduce the difficulty of internal venting of the battery cell, reduce venting energy consumption, save costs, improve the quality of the battery cell interface, and increase the long cycle life of the battery cell;

[0029] 2) Simple structure and low cost;

[0030] 3) The structure is easy to modify and has a wide range of applications;

[0031] 4) Extend the lifespan of negative pressure equipment, improve equipment efficiency, and reduce energy consumption;

[0032] 5) The uneven heat generation at different locations within the battery cell can be improved by the strong thermal conductivity of the heat exchange plate.

[0033] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A prismatic battery with a heat dissipation structure, comprising two stacked cores (1), characterized in that, It also includes an independent heat equalization mechanism (2) disposed between the two stacked cores (1). The heat equalization mechanism (2) includes at least one layer of metal heat equalization sheet. The heat equalization sheet has a mesh structure and is used to conduct heat between the two stacked cores (1) and provide a gas discharge channel for the negative pressure evacuation of the battery cell.

2. The prismatic battery with a heat dissipation structure according to claim 1, characterized in that, The thickness of the heat spreader is 0.1 to 1 mm.

3. The prismatic battery with a heat dissipation structure according to claim 1, characterized in that, The heat spreader includes several grids, each with a width of 1 to 10 mm.

4. The prismatic battery with a heat-equalizing structure according to any one of claims 1-3, characterized in that, The width of the stacked core is 150-300mm, and the length of the stacked core is 500-1000mm.

5. The prismatic battery with a heat dissipation structure according to claim 4, characterized in that, The size of the heat dissipation mechanism is no larger than the size of the stacked core.

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