Blade battery heat dissipation device and blade battery

Abstract

The utility model relates to a blade battery heat dissipation device and a blade battery. The blade battery heat dissipation device comprises a composite structure plate, the composite structure plate comprises two soaking plates and an aerogel plate, the aerogel plate is connected between the two soaking plates, and the two soaking plates are aligned with one side plate face of the aerogel plate. The blade battery heat dissipation device has the advantages of being high in heat transfer efficiency, good in heat dissipation effect, capable of fixing and supporting the blade battery and capable of preventing a battery shell from bulging.

Description

Technical Field

[0001] The utility model relates to the technical field of battery heat dissipation, in particular to a blade battery heat dissipation device and a blade battery. Background Art

[0002] The rapid development of new energy vehicles (NEVs) is driving higher demands on battery energy density, power density, safety, service life, extreme environment suitability, and cost reduction. As one of the core technologies for NEVs, the current state and future trends of battery technology are crucial for their widespread adoption. Compared to traditional lithium-ion power batteries, the flat blade battery design improves battery pack space utilization, increases energy density, offers a larger volume and capacity, and significantly enhances safety. However, due to the length and structure of the blade battery, the tabs for charging and discharging are located at the ends. Heat generated during charging and discharging is primarily generated near the tabs, resulting in a significant temperature difference between the ends and the center of the battery. Especially during fast charging, if heat cannot be dissipated quickly, the electrochemical reaction rate increases significantly at high temperatures and slows down at low temperatures. This difference can lead to capacity imbalances within different regions of the battery. This imbalance not only results in overall capacity loss and unstable power output, but also accelerates battery aging.

[0003] Given the uniquely long and narrow structure of blade batteries, selecting the right battery casing material and optimizing the heat dissipation structure are crucial. Currently, a vapor chamber is primarily used as a heat transfer channel to control the battery's surface temperature. The vapor chamber's evaporation end adheres to the battery's ends, while the condensation end adheres to the center. This simple heat dissipation method quickly and evenly distributes the blade battery's surface temperature, preventing heat accumulation. However, due to the long heat transfer distance between the ends and the center, a longer vapor chamber is required, which reduces the heat transfer rate. Utility Model Content

[0004] Based on this, the purpose of the present invention is to provide a blade battery heat dissipation device and a blade battery.

[0005] A blade battery heat dissipation device includes a composite structural plate, which includes two soaking plates and an aerogel plate. The aerogel plate is connected between the two soaking plates, and the two soaking plates are aligned with one side surface of the aerogel plate.

[0006] The blade battery heat dissipation device described in the present invention selects a corresponding heat dissipation scheme according to the specific heat conditions at both ends and in the middle of the battery, and adopts a composite structural plate of a heat spreader and an aerogel plate to form a composite heat dissipation shell. While meeting the heat dissipation requirements of the blade battery, the aerogel plate located in the middle of the blade battery can also play the role of fixing, supporting, dissipating heat and preventing the battery shell from expanding.

[0007] Furthermore, the vapor chamber includes an upper shell, a lower shell, and a wick. The upper shell overlies the lower shell, forming a sealed accommodation space within which the wick and the working medium are located. The wick is disposed on the lower shell and separated from the upper shell by a distance. A groove is provided on the side of the wick facing the upper shell, extending perpendicularly from the end of the vapor chamber away from the aerogel sheet toward the aerogel sheet. This technical solution shortens the heat transfer distance and improves heat transfer efficiency.

[0008] Furthermore, a plurality of metal braids are laid between the upper shell and the wick, and the extending direction of the metal braids is parallel to the extending direction of the groove. Through the above technical solution, the capillary performance in the extending direction of the groove is improved, and the heat dissipation capacity of the heat spreader is enhanced.

[0009] Furthermore, a plurality of support columns are provided between the upper shell and the liquid wick, and the extension direction of the support columns is from the upper shell to the liquid wick. Through the above technical solution, the upper shell will not collapse toward the lower shell when the heat spreader is working.

[0010] Furthermore, the heat spreader is made of copper or aluminum.

[0011] Furthermore, the blade battery heat dissipation device comprises two composite structural plates. The two vapor chambers and aerogel plates of one composite structural plate are connected to the two vapor chambers and aerogel plates of the other composite structural plate, respectively. The two composite structural plates are perpendicular to each other. This technical solution dissipates heat from both sides of the blade battery simultaneously.

[0012] Furthermore, the blade battery heat dissipation device comprises three interconnected composite structural plates, with two vapor chambers and an aerogel plate connected to each other, and the surfaces of adjacent composite structural plates being perpendicular. This technical solution allows for simultaneous heat dissipation from three sides of the blade battery.

[0013] Furthermore, the blade battery heat dissipation device comprises four sequentially connected composite structural plates, with two heat spreaders and aerogel plates correspondingly connected to each composite structural plate, and the surfaces of adjacent composite structural plates being perpendicular. This technical solution dissipates heat simultaneously from all four sides of the blade battery.

[0014] A blade battery comprises a battery cell and two tabs, wherein the two tabs are respectively located on two side surfaces in the length direction of the battery cell, and at least one side surface of the battery cell connected between the two tabs is covered with the above-mentioned blade battery heat dissipation device.

[0015] Furthermore, a thermal conductive mud layer or a thermal conductive silicone grease layer is provided between the heat sink and the battery core and / or between the aerogel plate and the battery core. The above technical solution enhances heat transfer performance.

[0016] The blade battery heat dissipation device provided by the utility model has the following advantages:

[0017] (1) A composite structural plate with a heat spreader at both ends and an aerogel plate in the middle is used. While meeting the heat dissipation requirements of the battery, the aerogel plate can fix and support the battery and prevent the battery shell from expanding.

[0018] (2) The liquid absorption core of the heat spreader is provided with a groove extending in a direction perpendicular to the direction from the heat spreader away from the aerogel plate to the aerogel plate, thereby shortening the heat transfer distance and enhancing the heat dissipation capacity of the heat spreader.

[0019] (3) It has a simple structure, is easy to prepare, and can be produced on a large scale. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of the blade battery heat dissipation device of the present invention when it is installed on the blade battery;

[0021] Figure 2 This is a schematic structural diagram of a blade battery heat dissipation device provided with a single composite structural plate in the present invention;

[0022] Figure 3 This is a cross-sectional schematic diagram of a blade battery heat dissipation device provided with a single composite structural plate in the present invention;

[0023] Figure 4 This is a schematic structural diagram of a blade battery heat dissipation device provided with two composite structural plates in the present invention;

[0024] Figure 5 This is a cross-sectional schematic diagram of a blade battery heat dissipation device provided with two composite structural plates in the present invention;

[0025] Figure 6 This is a schematic structural diagram of a blade battery heat dissipation device provided with three composite structural plates in the present invention;

[0026] Figure 7 This is a cross-sectional schematic diagram of a blade battery heat dissipation device provided with three composite structural plates in the present invention;

[0027] Figure 8 This is a schematic structural diagram of a blade battery heat dissipation device provided with four composite structural plates in the present invention at one viewing angle;

[0028] Figure 9This is a schematic structural diagram of the blade battery heat dissipation device provided with four composite structural plates in the present invention from another perspective;

[0029] Figure 10 This is a cross-sectional schematic diagram of a blade battery heat dissipation device provided with four composite structural plates in the present invention;

[0030] Figure 11 This is a cross-sectional view of the heat sink of the present invention;

[0031] Figure 12 This is a bottom view of the heat spreader in the present invention after the upper shell is removed, projected in a direction perpendicular to the lower shell;

[0032] Figure 13 This is a top view of the liquid absorbent core when projected in a direction perpendicular to the lower shell plate in the present utility model.

[0033] In the figure, 1, battery cell; 2, composite structure plate; 24, heat sink; 241, upper shell plate; 2411, metal braided belt; 2412, support column; 242, lower shell plate; 243, liquid wick; 2431, groove; 25, aerogel plate. DETAILED DESCRIPTION

[0034] After analyzing the heat generation of existing blade batteries during use, the applicant discovered that the heat generation distribution of existing blade batteries decreases from the tabs on both sides to the center, with the tabs generating the most heat and the center heating at a lower temperature. Based on this, the applicant believes that the primary issue in blade battery thermal management is to address the heat dissipation problem at both ends of the battery, while the temperature in the middle does not change much and only requires auxiliary heat dissipation. Therefore, the applicant proposed a blade battery heat dissipation device that attaches a heat spreader to both ends of the battery. Its high thermal conductivity reduces the temperature at both ends of the blade battery. An aerogel plate of the same thickness as the heat spreader is placed in the middle of the battery, where the temperature does not change much, to fix the battery, assist in heat dissipation, and prevent expansion of the battery casing. This results in the blade battery heat dissipation device of the present application having a heat spreader-aerogel plate composite heat dissipation casing.

[0035] In order to allow those skilled in the art to understand the present invention more clearly and intuitively, the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0036] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the overall structure of the blade battery heat dissipation device when it is installed on the blade battery in the present invention.

[0037] Among them, the blade battery (unmarked) includes a battery cell 1 and two pole tabs 3, and the two pole tabs 3 are respectively arranged on the front and rear sides of the battery cell 1 in the length direction. The battery cell 1 also includes an upper side, a left side, a right side and a lower side connected between the pole tabs 3 on both sides and connected in sequence to form a closed space.

[0038] The utility model provides a blade battery heat dissipation device, comprising a composite structural plate 2 covering at least one side surface of a battery core 1.

[0039] Please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic structural diagram of a blade battery heat dissipation device provided with a single composite structural plate in the present invention; Figure 3 It is a cross-sectional schematic diagram of a blade battery heat dissipation device provided with a single composite structural plate in the present invention.

[0040] In this embodiment, the composite structure plate 2 is laid on the upper side of the battery cell and extends from one side of the electrode tab 3 to the other side of the electrode tab 3. The composite structure plate 2 includes two vapor chambers 24 and an aerogel plate 25. The two vapor chambers 24 are respectively close to the electrode tabs 3 on both sides of the length direction of the battery cell 1. The aerogel plate 25 is connected between the two vapor chambers 24. The two vapor chambers 24 and one side of the aerogel plate 25 are aligned.

[0041] The aerogel plate 25 is formed by filling and curing the corresponding plate-shaped mold, and has the same shape and thickness as the heat spreader 24 of the corresponding embodiment. The aerogel plate 25 is fixed to the heat spreader 24 by welding, bolting or riveting.

[0042] Please combine Figures 11 to 13 , Figure 11 This is a cross-sectional view of the heat sink of the present invention; Figure 12 This is a bottom view of the heat spreader in the present invention after the upper shell is removed, projected in a direction perpendicular to the lower shell; Figure 13 This is a top view of the liquid absorbent core when projected in a direction perpendicular to the lower shell plate in the present utility model.

[0043] The heat spreader 24 includes an upper shell plate 241, a lower shell plate 242 and a liquid wick 243. The upper shell plate 241 is covered on the lower shell plate 242. The outer peripheries of the upper shell plate 241 and the lower shell plate 242 are connected to form a sealed accommodation space (not marked) therebetween. The liquid wick 243 and the working medium are arranged in the accommodation space. The liquid wick 243 is arranged on the inner surface of the lower shell plate 242 and is separated from the inner surface of the upper shell plate 241 by a certain distance to accommodate the gas working medium. Furthermore, a plurality of grooves 2431 extending in a direction parallel to the surface of the upper shell plate 241 are processed on the side of the liquid wick 243 facing the upper shell plate 241 by laser or other means, thereby improving the capillary performance, promoting the reflux and transportation of the working medium, and enhancing the heat transfer performance of the heat spreader 24. Preferably, the extending direction of the groove 2431 is perpendicular to the direction from the end of the vapor chamber 24 away from the aerogel plate 25 to the aerogel plate 25 .

[0044] The upper shell 241 or the lower shell 242 of the heat spreader 24 contacts the side of the battery cell 1 . A liquid cooling plate (not shown) is further provided on one side of the heat spreader 24 , and the plate surface of the liquid cooling plate is perpendicular to the extension direction of the groove 2431 .

[0045] During operation, the vapor chamber 24's end away from the liquid cooling plate serves as the evaporation end, while the end closer to the plate serves as the condensation end. Under capillary action, the liquid fluid flows from the condensation end along the grooves 2431 toward the evaporation end. After absorbing heat and evaporating, the gaseous fluid, under the influence of the pressure differential, transfers from the evaporation end to the condensation end, where it condenses, completing a heat exchange cycle. The heat transfer direction is perpendicular to the surface of the liquid cooling plate, shortening the heat transfer distance, avoiding the effects of capillary limitations along the longitudinal direction, and improving heat exchange efficiency.

[0046] Preferably, a plurality of metal braided belts 2411 are laid between the upper shell plate 241 and the liquid absorbent core 243. The two sides of the metal braided belt 2411 are respectively in contact with the inner surface of the upper shell plate 241 and the liquid absorbent core 243. The extension direction thereof is parallel to the extension direction of the groove 2431, and each metal braided belt 2411 is separated by a certain distance, thereby enhancing the capillary performance of the heat spreader 24 in the extension direction of the groove 2431 and further improving the heat exchange efficiency.

[0047] Preferably, a plurality of support columns 2412 are provided between the inner surface of the upper shell plate 241 and the liquid absorbent core 243, and the extension direction of the support columns 2412 is from the upper shell plate 241 to the liquid absorbent core 243, so that the upper shell plate 241 will not collapse toward the lower shell plate 242 when the heat spreader 24 is working.

[0048] Preferably, when the mold is filled with the cured aerogel plate 25 , a variety of thermal conductive materials, such as carbon fiber, aluminum nitride powder, boron nitride powder, etc., can be added to form a composite aerogel plate, thereby improving the thermal conductivity of the aerogel plate 25 .

[0049] Preferably, a thermal mud layer or a thermal grease layer is provided between the heat spreader 24 and the battery core 1 and / or at the junction between the aerogel plate 25 and the battery core 1, so as to enhance the heat transfer performance.

[0050] For further information, please refer to Figure 4 and Figure 5 , Figure 4 This is a schematic structural diagram of a blade battery heat dissipation device provided with two composite structural plates in the present invention; Figure 5 It is a cross-sectional schematic diagram of the blade battery heat dissipation device provided with two composite structural plates in the present invention.

[0051] The blade battery heat dissipation device includes two composite structural plates 2, wherein the two heat spreaders 24 and the aerogel plate 25 of one composite structural plate 2 are respectively connected to the two heat spreaders 24 and the aerogel plate 25 of the other composite structural plate 2, and the plate surfaces of the two composite structural plates 2 are perpendicular. The two composite structural plates 2 are respectively attached to the upper side and the left side of the battery cell 1 to dissipate heat therefrom.

[0052] For further information, please refer to Figure 6 and Figure 7 , Figure 6 This is a schematic structural diagram of a blade battery heat dissipation device provided with three composite structural plates in the present invention; Figure 7 It is a cross-sectional schematic diagram of the blade battery heat dissipation device provided with three composite structural plates in the present invention.

[0053] The blade battery heat dissipation device includes three composite structural plates 2 connected in sequence, the two heat spreaders 24 and the aerogel plate 25 of each composite structural plate 2 are connected correspondingly, the surfaces of two adjacent composite structural plates 2 are perpendicular, and the three composite structural plates 2 are respectively attached to the upper side, left side and right side of the battery cell 1 to dissipate heat therefrom.

[0054] For further information, please refer to Figures 8 to 10 , Figure 8 This is a schematic structural diagram of a blade battery heat dissipation device provided with four composite structural plates in the present invention at one viewing angle; Figure 9 This is a schematic structural diagram of the blade battery heat dissipation device provided with four composite structural plates in the present invention from another perspective; Figure 10 It is a cross-sectional schematic diagram of the blade battery heat dissipation device provided with four composite structural plates in the present invention.

[0055] The blade battery heat dissipation device comprises four sequentially connected composite structural plates 2. The two vapor chambers 24 and aerogel plates 25 of each composite structural plate 2 are sequentially connected, with the surfaces of adjacent composite structural plates 2 perpendicular to each other, thereby forming a closed cavity for accommodating the battery cell 1. The four composite structural plates 2 are respectively attached to the top, left, right, and bottom sides of the battery cell 1 to dissipate heat.

[0056] The present utility model also provides a blade battery, comprising a battery cell 1 and two pole tabs 3, the two pole tabs 3 being arranged on the front and rear sides in the length direction of the battery cell 1, and at least one side of the battery cell 1 connected between the pole tabs 3 on both sides being covered with the above-mentioned blade battery heat dissipation device, through which the surface of the blade battery cell 1 is rapidly dissipated, so that the temperature on the surface of the blade battery cell 1 is rapidly uniformed, thereby avoiding heat accumulation and ensuring the safety and life of the battery.

[0057] This utility model provides a blade battery heat sink device and blade battery. The device selects a heat dissipation solution based on the specific heat generation conditions at the battery's ends and center. A composite heat dissipation housing is constructed using a vapor chamber and aerogel plate. While meeting the blade battery's heat dissipation requirements, the aerogel plate located in the center of the blade battery also provides support, fixation, heat dissipation, and prevents expansion of the battery housing. Furthermore, the vapor chamber conducts heat perpendicularly to the upper and lower housing plates, shortening the heat transfer distance and increasing heat transfer efficiency. This allows the battery to rapidly dissipate heat even in high-power operating environments, evenly distributing heat and preventing thermal runaway accidents.

[0058] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous modifications and improvements without departing from the concept of the present invention, and the present invention is intended to encompass such modifications and variations.

Claims

1. A blade battery heat dissipation device, characterized by: The invention comprises a composite structure plate (2); the composite structure plate (2) comprises two soaking plates (24) and an aerogel plate (25); the aerogel plate (25) is connected between the two soaking plates (24); and the two soaking plates (24) are aligned with one side surface of the aerogel plate (25).

2. The blade battery heat dissipation device according to claim 1, characterized in that: The heat spreader (24) comprises an upper shell plate (241), a lower shell plate (242) and a liquid wick (243); the upper shell plate (241) covers the lower shell plate (242) to form a sealed accommodation space, wherein the liquid wick (243) and a working medium are arranged in the accommodation space; the liquid wick (243) is arranged on the lower shell plate (242) and is separated from the upper shell plate (241) by a distance; a groove (2431) is provided on the side of the liquid wick (243) facing the upper shell plate (241); the extension direction of the groove (2431) is perpendicular to the direction from the end of the heat spreader (24) away from the aerogel plate (25) to the aerogel plate (25).

3. The blade battery heat dissipation device according to claim 2, characterized in that: A plurality of metal braided belts (2411) are laid between the upper shell plate (241) and the liquid absorbent core (243), and the extension direction of the metal braided belts (2411) is parallel to the extension direction of the groove (2431).

4. The blade battery heat dissipation device according to claim 2, characterized in that: A plurality of support columns (2412) are further provided between the upper shell plate (241) and the liquid absorbent core (243), and the extension direction of the support columns (2412) points from the upper shell plate (241) to the liquid absorbent core (243).

5. The blade battery heat dissipation device according to claim 1, characterized in that: The heat soaking plate (24) is a copper or aluminum piece.

6. The blade battery heat dissipation device according to claim 1, characterized in that: The invention comprises two composite structural plates (2), wherein the two heat-diffusion plates (24) and the aerogel plate (25) of one composite structural plate (2) are respectively connected to the two heat-diffusion plates (24) and the aerogel plate (25) of the other composite structural plate (2), and the plate surfaces of the two composite structural plates (2) are perpendicular.

7. The blade battery heat dissipation device according to claim 1, characterized in that: It comprises three composite structural plates (2) connected in sequence, wherein the two heat-diffusion plates (24) and the aerogel plate (25) of each composite structural plate (2) are connected correspondingly, and the plate surfaces of two adjacent composite structural plates (2) are perpendicular.

8. The blade battery heat dissipation device according to claim 1, characterized in that: It comprises four composite structural plates (2) connected in sequence, wherein the two heat-diffusion plates (24) and the aerogel plates (25) of each composite structural plate (2) are connected correspondingly, and the plate surfaces of two adjacent composite structural plates (2) are perpendicular.

9. A blade battery, characterized by: The invention comprises a battery cell (1) and two tabs (3), wherein the two tabs (3) are respectively located on two side surfaces in the length direction of the battery cell (1), and at least one side surface of the battery cell (1) connected between the two tabs (3) is covered with the blade battery heat dissipation device according to any one of claims 1 to 8.

10. The blade battery according to claim 9, characterized in that: A thermally conductive mud layer or a thermally conductive silicone grease layer is provided between the heat diffusion plate (24) and the battery core (1) and / or between the aerogel plate (25) and the battery core (1).

Images