A lithium ion battery pole post heat dissipation structure
By designing phase change paraffin rings and sleeve structures on the lithium-ion battery terminals, efficient heat dissipation of the terminal area is achieved, solving the problem of lack of targeted heat dissipation in existing technologies and improving the safety and stability of the battery system.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XIAOGAN CORNEX NEW ENERGY INNOVATION TECHNOLOGY CO LTD
- Filing Date
- 2025-07-17
- Publication Date
- 2026-07-14
AI Technical Summary
Existing lithium battery heat dissipation technologies lack dedicated heat dissipation structures for the terminal post, leading to localized overheating in high-energy-density, high-power-output battery systems during charging and discharging, posing safety hazards.
A lithium-ion battery electrode heat dissipation structure is designed, which utilizes a phase change paraffin ring to absorb heat and undergo a phase change when the temperature rises. Combined with a sleeve, inner flange, and cell top cover, an annular cavity is formed, which is tightly fitted to the electrode to achieve efficient heat dissipation in the electrode area. The structure is also ensured to be stable by using sealant.
It effectively prevents short circuits and fires caused by overheating of the terminals, improves the safety and stability of the battery system, meets the thermal management requirements of high energy density and high power output battery systems, and ensures that the structure works stably under long-term high load.
Smart Images
Figure CN224502037U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of lithium battery heat dissipation technology, and in particular to a heat dissipation structure for lithium-ion battery terminals. Background Technology
[0002] During charging and discharging, lithium batteries generate a significant amount of heat internally. If this heat cannot be dissipated effectively and promptly, the battery temperature will rise, leading to a series of problems. Increased battery temperature not only accelerates material aging and shortens lifespan but can also cause serious consequences such as electrolyte decomposition and separator damage, potentially triggering thermal runaway and resulting in fires or explosions. Therefore, effective heat dissipation measures are crucial for ensuring the safety of lithium-ion batteries, extending their lifespan, and improving overall performance.
[0003] Temperature field simulation analysis during the charging and discharging process of lithium batteries revealed that the electrode welding area is the hottest region in the entire cell. Due to the small welding area and high current density in this region, it is highly susceptible to overheating, leading to overcurrent, short circuits, and even fires, becoming one of the main causes of battery thermal runaway. Therefore, effective heat dissipation design for this critical high-temperature region is particularly important.
[0004] Currently, heat dissipation solutions for lithium-ion batteries mainly include liquid cooling, air cooling, and solid-state thermally conductive materials. For example, invention patent CN108923098B discloses a cooling device for a lithium battery and lithium battery pack, which mainly uses a circulating cooling pipe to liquid cool the battery module. Patent application CN202111400761.2 discloses a heat conduction structure for lithium battery thermal management that uses a combination of thermally conductive copper blocks and fins for air cooling. Furthermore, utility model patent CN215680830U proposes a new energy lithium battery protection device based on a solid-state bonded heat dissipation device combining a silicone layer and a metal tube.
[0005] As with the aforementioned technical solutions, most existing heat dissipation technologies focus on overall cooling strategies, lacking dedicated heat dissipation structures for the lithium battery terminals. To meet the higher demands of current high-energy-density, high-power-output battery systems on thermal management, it is necessary to provide a highly efficient heat dissipation structure specifically designed for lithium-ion battery terminals. Utility Model Content
[0006] In view of this, this utility model proposes a heat dissipation structure for lithium-ion battery terminals. By utilizing the characteristic of phase change paraffin material to absorb heat and undergo phase change when the temperature rises, it achieves efficient and targeted heat dissipation in the terminal area. This effectively makes up for the lack of special treatment for local hot spots in existing heat dissipation technologies, thereby better meeting the higher requirements for thermal management of current high energy density and high power output battery systems.
[0007] The technical solution of this utility model is implemented as follows:
[0008] This utility model provides a heat dissipation structure for lithium-ion battery terminals, including a sleeve and a phase change paraffin ring, wherein...
[0009] The sleeve is fitted around the outer periphery of the battery cell electrode post, and its lower end is fixedly connected to the top of the battery cell top cover. The upper end has an inner flange, which is fixedly connected to the edge of the top of the battery cell electrode post.
[0010] The sleeve, the cell electrode, the cell top cover, and the inner flange together form a closed annular cavity.
[0011] The phase change paraffin ring is embedded in the annular cavity and is tightly fitted to the battery cell electrode post.
[0012] Based on the above technical solutions, preferably, the height of the annular cavity in the vertical direction is greater than the thickness of the phase change paraffin ring in the vertical direction.
[0013] Based on the above technical solutions, preferably, a boss-shaped welding position is provided at the middle position of the top of the battery cell electrode post, wherein,
[0014] The welding position is located inside the inner flange, and its top end is higher than the top end of the inner flange.
[0015] Based on the above technical solutions, preferably, the top of the battery cell cover is provided with a first annular groove, wherein...
[0016] The lower end of the sleeve is embedded in the first annular groove.
[0017] Based on the above technical solutions, preferably, the top edge of the battery cell terminal is provided with a stepped groove, wherein...
[0018] The end of the inner flange away from the sleeve is fixed in the settling groove.
[0019] Based on the above technical solutions, preferably, the depth of the sinking groove in the vertical direction is equal to the thickness of the inner flange in the vertical direction.
[0020] Based on the above technical solutions, preferably, the bottom of the settling tank is provided with a second annular groove, and the end of the inner flange away from the sleeve is bent downward to form a second flange, wherein...
[0021] The second flange is embedded in the second annular groove.
[0022] Based on the above technical solutions, preferably, the connection between the sleeve and the first annular groove, the connection between the inner flange and the sink groove, and the connection between the second flange and the second annular groove are all sealed with sealant.
[0023] Based on the above technical solutions, preferably, the sleeve is made of insulating material and is cylindrical or square in shape.
[0024] Based on the above technical solutions, a preferred option also includes an explosion-proof valve, wherein...
[0025] The explosion-proof valve is located on the top cover of the battery cell.
[0026] The lithium-ion battery electrode heat dissipation structure of this utility model has the following advantages over the prior art:
[0027] (1) By embedding a phase change paraffin ring in the inner cavity of the annular cavity formed by the sleeve, the top cover of the cell, the inner flange, and the cell terminal, and ensuring that the phase change material is tightly attached to the terminal, the phase change paraffin can effectively absorb the local heat generated in the terminal area during high-rate charging and discharging by utilizing its characteristic of absorbing heat and undergoing phase change when the temperature rises. This prevents safety hazards such as short circuits and fires caused by overheating, and significantly improves the safety and operational stability of the battery system. At the same time, this structure achieves precise heat dissipation of local hot spots on the terminal, making up for the lack of targeted design in existing heat dissipation technologies, and better meeting the higher requirements for thermal management of current high-energy-density and high-power output battery systems.
[0028] (2) By setting the height of the annular cavity in the vertical direction to be greater than the thickness of the phase change paraffin ring, sufficient expansion space is reserved for the phase change material during the solid-liquid transition process. This can avoid structural deformation or sealing failure caused by volume expansion, thereby improving the reliability and service life of the heat dissipation structure and ensuring that it can still work stably under long-term high load conditions.
[0029] (3) By setting a first annular groove on the top cover of the battery cell, a recessed groove at the top edge of the battery cell terminal, and a second annular groove at the bottom of the recessed groove, the sleeve and its inner flange and second flange can be precisely fitted and installed, forming a multi-level positioning and support structure, thereby improving the structural strength. In addition, each connection part is sealed with sealant to effectively prevent leakage of liquid paraffin during the phase change process, further ensuring the stability of heat dissipation performance and the safety of the structure. Attached Figure Description
[0030] 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 of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0031] Figure 1 This is a perspective view of a lithium-ion battery electrode heat dissipation structure according to the present invention;
[0032] Figure 2 This is a schematic diagram showing the fit between the inner flange and the sinker.
[0033] Figure 3 This is a schematic diagram showing the fit between the second flange and the second annular groove.
[0034] Figure 4 This is a schematic diagram of the top structure of the battery cell cover;
[0035] Figure 5 This is a three-dimensional view of the sleeve;
[0036] In the diagram: 1. Sleeve; 2. Phase change paraffin ring; 3. Cell electrode post; 4. Cell top cover; 5. Explosion-proof valve; 101. Inner flange; 102. Annular cavity; 301. Welding position; 302. Sinking groove; 401. First annular groove; 1011. Second flange; 3021. Second annular groove. Detailed Implementation
[0037] The technical solutions of this utility model will be clearly and completely described below with reference to specific embodiments. 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 scope of protection of this utility model.
[0038] like Figures 1-5 As shown, the present invention provides a lithium-ion battery electrode heat dissipation structure, including a sleeve 1 and a phase change paraffin ring 2.
[0039] The sleeve 1 is fitted around the outer periphery of the cell electrode 3, with its lower end fixedly connected to the top of the cell top cover 4. The upper inner side has an inner flange 101, which is fixedly connected to the top edge of the cell electrode 3. The sleeve 1, cell electrode 3, cell top cover 4, and inner flange 101 together form a closed annular cavity 102. The phase change paraffin ring 2 is embedded in this annular cavity 102 and is tightly fitted to the cell electrode 3.
[0040] By utilizing the property of phase change paraffin to absorb heat and undergo a phase change when the temperature rises, this structure effectively absorbs the localized heat generated in the electrode area during high-rate charging and discharging, preventing safety hazards such as short circuits and fires caused by overheating, and significantly improving the safety and operational stability of the battery system. Simultaneously, this structure achieves precise heat dissipation of localized hot spots in the electrode, overcoming the lack of targeted design in existing heat dissipation technologies and better meeting the higher thermal management requirements of current high-energy-density, high-power-output battery systems.
[0041] Furthermore, the vertical height of the annular cavity 102 is greater than the vertical thickness of the phase change paraffin ring 2, which provides expansion space for the phase change paraffin during the process of changing from solid to liquid, avoiding structural deformation or sealing failure caused by volume expansion, thereby improving the reliability and service life of the heat dissipation structure and ensuring that it can still work stably under long-term high load conditions.
[0042] In the above heat dissipation structure, a boss-shaped welding position 301 is provided at the middle position of the top of the battery cell electrode 3. The welding position 301 is located inside the inner flange 101, and its top is higher than the top of the inner flange 101, so that the welding position 301 protrudes upward from the inner flange 101, which facilitates the subsequent welding of conductive busbars to the top of the electrode.
[0043] In the above heat dissipation structure, the top of the battery cell cover 4 is provided with a first annular groove 401, and the lower end of the sleeve 1 is embedded in the first annular groove 401. The top edge of the battery cell terminal 3 is provided with a stepped groove 302, and the end of the inner flange 101 away from the sleeve 1 is fixed in the groove 302. The bottom of the groove 302 is provided with a second annular groove 3021, and the end of the inner flange 101 away from the sleeve 1 is bent downward to form a second flange 1011, which is embedded in the second annular groove 3021. The connection between the sleeve 1 and the first annular groove 401, the connection between the inner flange 101 and the groove 302, and the connection between the second flange 1011 and the second annular groove 3021 are all sealed with sealant.
[0044] This structure enables precise fitting and installation of the sleeve 1 and its inner flange 101 and second flange 1011, forming a multi-level positioning and support structure to enhance structural strength. Furthermore, each connection point is sealed with sealant to effectively prevent leakage of liquid paraffin during the phase change process, further ensuring the stability of heat dissipation performance and the safety of the structure.
[0045] Furthermore, the depth of the groove 302 in the vertical direction is equal to the thickness of the inner flange 101 in the vertical direction. This ensures that after the sleeve 1 is installed, the top surface of the inner flange 101 is flush with the top surface of the battery cell terminal 3, which will not hinder the subsequent welding operation of the conductive busbar.
[0046] In the above heat dissipation structure, the sleeve 1 is made of insulating material in the shape of a cylinder or square tube, such as plastic or rubber, which not only ensures good electrical insulation performance, but also has a certain mechanical strength and processing adaptability, making it easy to assemble and seal.
[0047] In addition, the top cover 4 of the battery cell is equipped with an explosion-proof valve 5, which is used to release pressure and discharge high-temperature gases in the event of battery thermal runaway, thereby reducing the overall internal temperature of the battery. For example, during battery charging and discharging, thermal runaway may occur, rapidly generating a large amount of heat and gas. The timely response of the explosion-proof valve 5 can quickly release heat and gas, preventing the further spread of thermal runaway, providing additional safety for the terminal heat dissipation structure, ensuring effective temperature control even under extreme conditions, and preventing serious consequences caused by thermal runaway.
[0048] Furthermore, the aforementioned phase change paraffin ring 2 is made of paraffin wax (n-octacosane), with a melting point range of 30–70°C. Liquid paraffin wax can be shaped using a ring mold and then cooled and solidified to obtain a solid phase change paraffin ring 2. To further improve its physical properties, modifying materials such as silicone grease, epoxy resin, or ceramic powder can be added to the paraffin wax.
[0049] The method of using the lithium-ion battery electrode heat dissipation structure of this utility model is as follows:
[0050] The phase change paraffin ring 2 is fitted onto the cell terminal 3, and then sealant is applied to the surfaces of the first annular groove 401, the recessed groove 302, and the second annular groove 3021. Next, the sleeve 1 is fitted onto the phase change paraffin ring 2, with its lower end embedded in the first annular groove 401, the inner flange 101 embedded in the recessed groove 302, and the second flange 1011 embedded in the second annular groove 3021. After the sealant cures, the sleeve 1 is installed and fixed.
[0051] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A lithium-ion battery electrode heat dissipation structure, comprising a sleeve (1), characterized in that: It also includes phase change paraffin rings (2), in which, The sleeve (1) is fitted around the outer periphery of the cell electrode post (3), and its lower end is fixedly connected to the top of the cell top cover (4). The upper end has an inner flange (101) on its inner side, and the inner flange (101) is fixedly connected to the edge of the top of the cell electrode post (3). The sleeve (1) forms a closed annular cavity (102) with the battery cell terminal (3), the battery cell top cover (4) and the inner flange (101). The phase change paraffin ring (2) is embedded in the annular cavity (102) and is tightly fitted with the battery cell terminal (3).
2. The lithium-ion battery electrode heat dissipation structure as described in claim 1, characterized in that: The height of the annular cavity (102) in the vertical direction is greater than the thickness of the phase change paraffin ring (2) in the vertical direction.
3. The lithium-ion battery electrode heat dissipation structure as described in claim 1, characterized in that: The top of the battery cell terminal (3) is provided with a boss-shaped welding position (301) in the middle position, wherein, The welding position (301) is located inside the inner flange (101), and its top end is higher than the top end of the inner flange (101).
4. The lithium-ion battery electrode heat dissipation structure as described in claim 1, characterized in that: The top of the battery cell cover (4) is provided with a first annular groove (401), wherein, The lower end of the sleeve (1) is embedded in the first annular groove (401).
5. A lithium-ion battery electrode heat dissipation structure as described in claim 4, characterized in that: The top edge of the battery cell terminal (3) is provided with a stepped groove (302), wherein, The end of the inner flange (101) away from the sleeve (1) is fixed in the sink (302).
6. A lithium-ion battery electrode heat dissipation structure as described in claim 5, characterized in that: The depth of the sink (302) in the vertical direction is equal to the thickness of the inner flange (101) in the vertical direction.
7. A lithium-ion battery electrode heat dissipation structure as described in claim 5, characterized in that: The bottom of the settling tank (302) is provided with a second annular groove (3021), and the end of the inner flange (101) away from the sleeve (1) is bent downward to form a second flange (1011), wherein, The second flange (1011) is embedded in the second annular groove (3021).
8. A lithium-ion battery electrode heat dissipation structure as described in claim 7, characterized in that: The connection between the sleeve (1) and the first annular groove (401), the connection between the inner flange (101) and the sinker (302), and the connection between the second flange (1011) and the second annular groove (3021) are all sealed with sealant.
9. A lithium-ion battery electrode heat dissipation structure as described in claim 1, characterized in that: The sleeve (1) is made of insulating material in the shape of a cylinder or a square tube.
10. A lithium-ion battery electrode heat dissipation structure as described in claim 1, characterized in that: It also includes an explosion-proof valve (5), wherein, The explosion-proof valve (5) is located on the top cover (4) of the battery cell.