Battery cell heat dissipation structure and battery

Abstract

The application relates to the technical field of power batteries, and provides a battery cell heat dissipation structure and a battery. The battery cell heat dissipation structure comprises a battery cell and a cooling plate arranged on one side of the battery cell. The top of the battery cell is provided with a top cover, the top cover is provided with a pole post, the pole post is connected with a tab led out from a pole group in the battery cell, the inside of the top cover is provided with a hollow inner cavity, a heat conductor is arranged in the inner cavity, one end of the top cover abuts against the cooling plate, heat generated by the pole group is transmitted to the heat conductor through the tab and the pole post, and the heat is transmitted to the cooling plate through the heat conductor and the shell of the top cover. The battery cell heat dissipation structure can transmit the heat generated by the pole group and the tab to the heat conductor in the inner cavity of the top cover through the pole post, the heat conductor can transmit the heat to the end of the top cover at a faster speed, and then the heat is dissipated to the outside of the battery pack through the cooling plate, so that the cooling and heat dissipation effect of the inside of the battery cell and the position of the pole post is improved.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and in particular to a cell heat dissipation structure and a battery. Background Technology

[0002] With technological advancements, the charging rate of battery packs is gradually increasing, which in turn poses a significant challenge to the cooling performance of the internal cooling system. In some related technologies, battery packs, due to their lower charging rates and longer charging times, do not provide additional cooling for the terminals; others simply employ localized cooling structures to cool the cell terminals.

[0003] However, as the requirements for fast charging time become increasingly stringent, many battery pack charging solutions need to increase the overall charging rate. During high-current charging, the heat generated by the tabs of the electrode assembly can only be exchanged with the outside environment through the internal structure of the terminal posts. The heat exchange efficiency is slow, and the temperature rise of the electrode assembly is greatly affected by the heat generated by the tabs. Moreover, the heat generated at the cell terminals is higher than the temperature rise of the cell electrode assembly. If the temperature rise at the terminals is not controlled, the sustained high temperature will trigger the battery pack's over-temperature protection function, increasing the charging time of the battery pack and, in severe cases, affecting the battery's lifespan. Utility Model Content

[0004] In view of this, this application aims to propose a cell heat dissipation structure to improve the cooling effect inside the cell and at the electrode position.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows: A battery cell heat dissipation structure includes a battery cell and a cooling plate disposed on one side of the battery cell; the top of the battery cell is provided with a top cover, and an electrode post is mounted on the top cover, the electrode post being connected to an electrode tab extending from an electrode assembly inside the battery cell; the top cover has a hollow inner cavity, a heat conductor is disposed in the inner cavity, and one end of the top cover abuts against the cooling plate; the heat emitted by the electrode assembly is transferred to the heat conductor through the electrode tab and the electrode post, and then transferred to the cooling plate through the heat conductor and the shell of the top cover.

[0006] Furthermore, the top cover includes a top cover body and a cover plate that covers the top cover body; the inner cavity is formed on the top cover body, and the cover plate covers the top of the inner cavity to keep the inner cavity in a sealed state.

[0007] Furthermore, the inner cavity is provided with an electrode insertion platform, and the electrode is inserted into a first electrode through hole provided on the electrode insertion platform. The electrode insertion platform forms an isolation between the electrode and the heat conductor.

[0008] Furthermore, the inner cavity is provided with multiple partitions, each of which is arranged along the length of the top cover, forming a narrow flow channel between each partition, and the heat conductor flows within the flow channel.

[0009] Furthermore, the heat conductor includes a heat pipe working fluid filled in each of the flow channels.

[0010] Furthermore, each of the flow channels is filled with a liquid-absorbing core, and a capillary structure is formed in the liquid-absorbing core, with the heat pipe working fluid filling the capillary structure of the liquid-absorbing core.

[0011] Furthermore, the top cover is made of aluminum, stainless steel or copper, and / or the heat pipe working fluid is ammonia, methanol or water as a phase change material.

[0012] Furthermore, coolant circulates inside the cooling plate, and a connecting port is provided on the shell of the top cover that abuts against one end of the cooling plate. The coolant enters and exits the inner cavity through the connecting port and flows in the flow channel, forming the heat conductor.

[0013] Furthermore, the connecting port includes an inlet and a return port spaced apart. A set of partitions in the middle of the inner cavity is connected to the housing between the inlet and the return port. Each flow channel on one side of the set of partitions forms an inlet flow channel connecting to the inlet, and each flow channel on the other side forms a return flow channel connecting to the return port. Relative to the end where the connecting port is located, the inlet flow channel and the return flow channel are connected at the other end of the inner cavity.

[0014] Compared with related technologies, this application has the following advantages: (1) The heat dissipation structure of the battery cell in this application provides a heat conductor in the inner cavity of the top cover and a cooling plate on one side of the battery cell. In the case of high current charging of the battery pack, the heat generated by the electrode group and its tabs will be transferred to the heat conductor in the top cover through the electrode post. The heat conductor can transfer the heat at the position of the tab and the electrode post to the end of the top cover more efficiently, and then dissipate it to the outside of the battery pack through the cooling plate. This is beneficial to improving the cooling effect inside the battery cell and at the position of the electrode post.

[0015] (2) The top cover adopts the structure of the top cover body and the cover plate, which facilitates the processing and molding of the inner cavity. During processing, the top cover body with the groove structure can be integrally injection molded. After the cover plate is sealed on the top of the top cover body, the groove on the top cover body forms the inner cavity, which is beneficial to the separate processing and manufacturing of the top cover body and the cover plate.

[0016] (3) A pole insertion platform is formed on the top cover body, and a first pole through hole is processed on the pole insertion platform. After the top cover is sealed to the top of the cell, the pole can be inserted into the first pole through hole. The pole insertion platform forms a reliable isolation between the heat conductor in the inner cavity and the pole, which can ensure the insulation effect between poles of different polarities and the structural stability of the pole.

[0017] (4) Multiple baffles are set in the inner cavity to form a dense and narrow flow channel in the inner cavity, which can not only improve the flow and heat dissipation effect of the heat conductor, but also, especially if the heat pipe working fluid is used in the heat conductor, the dense flow channel creates a capillary structure that facilitates the phase change of the heat pipe working fluid, which can further improve the heat conduction and heat dissipation effect of the top cover.

[0018] (5) The heat conductor uses heat pipe working fluid, and a good heat pipe heat dissipation system is formed inside the top cover. Especially during the high-rate charging process of the battery cell, the high temperature of the electrode tab is transferred to the top cover of the battery cell through the electrode post. The top cover of the battery cell quickly transfers heat to the cooling plate through the "heat pipe" structure, making full use of the efficient heat conduction performance of heat pipe heat dissipation technology, and achieving the purpose of rapid cooling of the battery cell electrode group.

[0019] (6) Based on the shape and distribution of the flow channels in the inner cavity, the liquid wick is designed accordingly. After the liquid wick is filled in the flow channels of the inner cavity, a capillary structure condition that facilitates the phase change of the heat pipe working fluid can be formed. After the heat pipe working fluid is filled into the liquid wick, an excellent heat pipe heat conduction structure condition is formed inside the top cover, which can greatly improve the heat conduction and heat dissipation effect of the top cover.

[0020] (7) The top cover body and cover plate are made of aluminum, stainless steel or copper, which not only facilitates the structural construction, but also the above materials have good thermal conductivity. Ammonia, methanol or water are used as heat pipe working fluids, which are easy to prepare, have good phase change effect, and can enhance the heat transfer effect of the top cover heat pipe.

[0021] (8) By using the coolant in the cooling plate and setting a connecting port at the end of the top cover, the flow channel inside the top cover and the cooling channel in the cooling plate form a unified cooling circulation system, and the coolant forms the heat conductor of the top cover. Through the efficient circulation of the coolant, the good thermal conductivity of the top cover can be guaranteed, thereby improving the cooling effect inside the cell and at the electrode position.

[0022] (9) A set of partitions in the middle of the inner cavity is used as the isolation structure of each flow channel in the inner cavity. By connecting one end of the partitions to the shell between the liquid inlet and the liquid return outlet, each flow channel in the inner cavity forms a good circulation system, which can improve the circulation flow effect of the heat conductor in the inner cavity, and further improve the heat transfer and heat dissipation performance of the top cover.

[0023] Another objective of this application is to provide a battery that employs the cell heat dissipation structure described in this application. The battery of this application possesses the technical advantages of the aforementioned cell heat dissipation structure. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application. The directional terms such as front / back, up / down, etc., used therein are only used to indicate relative positional relationships and do not constitute an improper limitation of this application. In the accompanying drawings: Figure 1 This is a schematic diagram showing the disassembled structure of the cell heat dissipation structure described in the embodiments of this application; Figure 2 This is a schematic diagram showing another configuration of the cell heat dissipation structure described in the embodiments of this application. Figure 3 This is a schematic diagram of the split structure of the third configuration of the cell heat dissipation structure described in the embodiments of this application; Figure 4 This is a schematic diagram of the heat dissipation path of the battery cell heat dissipation structure described in the embodiments of this application.

[0025] Explanation of reference numerals in the attached figures: 1. Top cover body; 10. Inner cavity; 100. Flow channel; 101. Liquid inlet channel; 102. Liquid return channel; 11. Electrode insertion platform; 110. First electrode through hole; 12. Partition plate; 121. First baffle plate; 122. Second baffle plate; 123. Third baffle plate; 13. Connecting port; 131. Liquid inlet; 132. Liquid return port; 2. Cover plate; 20. Second pole post through hole; 3. Liquid wick; 4. Heat pipe working fluid; 5. Battery cell; 6. Cooling plate; 60. Coolant. Detailed Implementation

[0026] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0027] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0028] Furthermore, it should be stated in the description of this application that if terms indicating orientation or positional relationship, such as "up," "down," "left," "right," "front," "back," "inner," or "outer," appear, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and for clarity and conciseness of expression, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed or operated in a specific orientation, and therefore should not be construed as a limitation of this application. Taking the top cover of the battery cell described in this application as an example, the directional terms such as "up," "down," "left," "right," "front," and "back" used in the embodiments are defined based on the top cover's vertical direction (also known as the height direction), horizontal direction (also known as the width direction), and front-back direction (also known as the length direction). Specifically, as shown in the accompanying drawings, the X direction is the length direction of the top cover, and the Y direction is the width direction of the top cover.

[0029] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joint," and "connector" should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances. The qualifying terms such as "first," "second," "A," "B," "C," and "D" appearing in the description of this application are merely for distinguishing similar features in different locations, attributions, or uses, in order to avoid ambiguity and confusion, and should not be construed as indicating or implying relative importance.

[0030] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] In traditional designs, battery packs often lack additional cooling for the terminals due to lower charging rates and longer charging times. Some designs only employ localized cooling structures for the cell terminals. However, as many battery pack charging schemes require increased overall charging rates, during high-current charging, the heat generated at the electrode tabs can only be exchanged with the external environment through the internal structure of the terminal post. This heat exchange is inefficient, and the temperature rise of the electrode assembly is significantly affected by the heat generated at the tabs. Furthermore, the heat generated at the cell terminals can exceed the temperature rise of the entire cell assembly. If this temperature rise is not controlled, sustained high temperatures can trigger the battery pack's over-temperature protection function, increasing charging time and potentially impacting battery lifespan.

[0032] In view of the above-mentioned problems in the related technologies, this application innovatively proposes a brand-new cell heat dissipation structure, which can improve the cooling effect inside the cell 5 and at the electrode position.

[0033] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0034] An embodiment of the first aspect of this application provides a cell heat dissipation structure for enhancing the cooling effect on the top cover electrode and its adjacent parts of the cell 5; one exemplary structure is as follows: Figure 1 , Figure 2 or Figure 3 As shown.

[0035] Overall, the cell heat dissipation structure includes a cell 5 and a cooling plate 6 located on one side of the cell 5. The cell 5 has a top cover, and a terminal post is mounted on the top cover. The terminal post is connected to a tab leading out from the electrode assembly inside the cell 5. The top cover has a hollow inner cavity 10, in which a heat conductor is installed. One end of the top cover abuts against the cooling plate 6. The heat dissipated by the electrode assembly is transferred to the heat conductor through the tab and the terminal post, and then transferred to the cooling plate 6 through the heat conductor and the shell of the top cover.

[0036] Based on the above overall design concept, by setting a heat conductor in the inner cavity 10 of the top cover and setting a cooling plate 6 on one side of the battery cell 5, in operating scenarios such as high current charging of the battery pack, the heat generated by the electrode group and its tabs will be transferred to the heat conductor in the top cover through the electrode post. The heat conductor can transfer the heat at the tab and electrode post position to the end of the top cover more efficiently, and then dissipate it to the outside of the battery pack through the cooling plate 6, which is beneficial to improving the cooling effect inside the battery cell 5 and at the electrode post position.

[0037] It should be noted that, based on the above overall design concept, the technical solution of this application can adopt a variety of different specific implementation structures, forms, or configuration sequences. For example, the heat conductor can be a heat pipe working fluid 4 capable of heat conduction through phase change heat absorption and dissipation, or it can be a circulating coolant 60; a liquid wick 3 can be provided in the inner cavity 10 of the top cover, or a densely arranged flow channel 100 can be constructed. The specific arrangement sequence and assembly method of the battery cell 5, the top cover and its internal heat conductor, cooling plate 6, etc., can also be flexibly adjusted. For the parts required for the implementation of the overall solution but not covered in the above overall setup, reasonable and flexible designs can be made by referring to mature setup methods in the field and the actual situation during implementation, which will not be elaborated here. The specific implementation schemes described below in this embodiment are only one of the many solutions that can be formed by the various combinations and variations of the above. In actual implementation, those skilled in the art can make flexible adjustments and improvements based on the actual situation. Obviously, the various solutions that can be formed by the combinations and variations of the above specific forms, as well as the specific implementation schemes of this embodiment, are all within the protection scope of this application.

[0038] Specifically, in this embodiment, as Figure 1 As shown, in some preferred exemplary embodiments, the top cover includes a top cover body 1 and a cover plate 2 that covers the top cover body 1; the inner cavity 10 is formed on the top cover body 1, and the cover plate 2 covers the top of the inner cavity 10 to keep the inner cavity 10 in a sealed state. The top cover adopts the structure of the top cover body 1 and the cover plate 2, which facilitates the processing and forming of the inner cavity 10; during processing, the top cover body 1 with a groove structure can be integrally injection molded, and after the cover plate 2 is covered on the top of the top cover body 1, the groove on the top cover body 1 forms the inner cavity 10, which is beneficial for the separate processing and manufacturing of the top cover body 1 and the cover plate 2.

[0039] Based on the requirement for electrode insertion, preferably, the inner cavity 10 of the top cover body 1 in this embodiment is provided with an electrode insertion platform 11. The electrode is inserted into the first electrode through hole 110 provided on the electrode insertion platform 11, thereby forming an isolation between the electrode and the heat conductor. Correspondingly, the cover plate 2 is provided with a second electrode through hole 20. When the cover plate 2 is sealed on the top of the top cover body 1, the electrode passes through the first electrode through hole 110 and the second electrode through hole 20 from bottom to top, thereby realizing the connection between the electrode lug of the electrode group and the external circuit. A terminal insertion platform 11 is formed on the top cover body 1, and a first terminal through hole 110 is machined on the terminal insertion platform 11. After the top cover is sealed to the top of the cell 5, the terminal can be inserted into the first terminal through hole 110. The terminal insertion platform 11 forms a reliable isolation between the heat conductor and the terminal in the inner cavity 10, which can ensure the insulation effect between terminals of different polarities and the structural stability of the terminal.

[0040] Still Figure 1 As shown, in some preferred exemplary embodiments, the inner cavity 10 of this embodiment is provided with a plurality of baffles 12, each baffle 12 being arranged along the length direction of the top cover. This forms elongated flow channels 100 between the baffles 12, through which the aforementioned heat conductor flows. The provision of a plurality of baffles 12 in the inner cavity 10 creates dense, elongated flow channels 100, which not only improves the flow and heat dissipation of the heat conductor, but also, especially when the heat conductor is the heat pipe working fluid 4 described below, the dense flow channels 100 create capillary structural conditions that facilitate phase change of the heat pipe working fluid 4, further enhancing the heat conduction and heat dissipation effect of the top cover.

[0041] As mentioned above, there are various configuration options for heat conductors. For example, such as... Figure 2 As shown, the heat conductor in this embodiment includes a heat pipe working fluid 4 filled in each flow channel 100. The heat conductor uses the heat pipe working fluid 4, forming a good heat pipe heat dissipation system inside the top cover. Especially during high-rate charging of the battery cell, the high temperature of the tabs is transferred to the top cover of the battery cell 5 through the electrode posts. The top cover of the battery cell 5 quickly transfers heat to the cooling plate 6 through the "heat pipe" structure, fully utilizing the efficient heat conduction performance of the heat pipe heat dissipation technology and effectively achieving the goal of rapid cooling of the inner electrode assembly of the battery cell 5.

[0042] Based on the above configuration, preferably, each flow channel 100 can be filled with a wick 3, which has a capillary structure to allow the heat pipe working fluid 4 to fill the capillary structure within the wick 3. The wick structure is a core functional component of high-efficiency heat transfer devices such as heat pipes. Essentially, it is a material component with a porous or microchannel structure, whose internal porous or microchannel structure forms the capillary structure required by the heat pipe. The wick 3 drives the liquid working fluid (such as water, ethanol, ammonia, etc.) within the heat pipe to flow back from the condensation end to the evaporation end through capillary force, thereby achieving continuous circulation of the working fluid and ensuring the high-efficiency heat transfer capability of the heat pipe. Based on the shape and distribution of the flow channels 100 in the inner cavity 10, the wick 3 is designed to conform to the shape. After the wick 3 is filled in the flow channels 100 of the inner cavity 10, a capillary structure condition that is more conducive to the phase change of the heat pipe working fluid 4 can be formed. After the heat pipe working fluid 4 is filled into the wick 3, an excellent heat pipe heat conduction structure condition is formed inside the top cover, which can greatly improve the heat conduction and heat dissipation effect of the top cover.

[0043] Of course, the coolant 60 in the cooling plate 6 can also be used as a heat conductor, such as... Figure 3As shown, in some preferred exemplary embodiments, given that coolant 60 circulates inside the cooling plate 6, a connecting port 13 can be provided on the housing at one end of the top cover that abuts the cooling plate 6. The coolant 60 enters and exits the inner cavity 10 through the connecting port 13 and flows within the flow channel 100, forming the aforementioned heat conductor. Utilizing the coolant 60 within the cooling plate 6, and by providing the connecting port 13 at the end of the top cover, the flow channel 100 inside the top cover and the cooling channel within the cooling plate 6 form a unified cooling circulation system, with the coolant 60 acting as the heat conductor for the top cover. The efficient circulation of the coolant 60 ensures good thermal conductivity of the top cover, thereby improving the cooling effect inside the battery cell 5 and at the electrode position.

[0044] In the above-described case, preferably, the following specific solution can be adopted. The connecting port 13 includes an inlet port 131 and a return port 132 arranged at intervals. Meanwhile, among the partitions 12 in the inner cavity 10, a group of partitions 12 in the middle plays a separating role. This group of partitions 12 is connected to the shell between the inlet port 131 and the return port 132. Each flow channel 100 on one side of this group of partitions 12 forms an inlet flow channel 101 connecting to the inlet port 131, and each flow channel 100 on the other side forms a return flow channel 102 connecting to the return port 132. At the same time, relative to the end where the connecting port 13 is provided, it is required that the inlet flow channel 101 and the return flow channel 102 are connected at the other end of the inner cavity 10, thereby forming a good channel for the circulation of coolant 60.

[0045] Given that the inner cavity 10 has two pole post mounting platforms 11, it is possible to take the following... Figure 3 The three baffles 12 shown—the first baffle 121, the second baffle 122, and the third baffle 123—are used as a set of baffles 12 to perform the separation function mentioned above. In a specific configuration, the two ends of the first baffle 121 are connected between the housing at the end where the connecting port 13 is located and the electrode insertion platform 11; the two ends of the second baffle 122 are connected between the two electrode insertion platforms 11; and one end of the third baffle 123 is connected to the electrode insertion platform 11, while the other end leaves a gap between it and the housing at the end away from the connecting port 13, forming a channel connecting each liquid inlet channel 101 and each liquid return channel 102.

[0046] Combination Figure 4As shown, the coolant 60 in the cooling plate 6 can enter the inner cavity 10 through the inlet 131, and then flow through the inlet channel 101 and the return channel 102 in sequence, before flowing back into the cooling plate 6 through the return port 132, forming a good cooling cycle. It can be seen that by using a set of partitions 12 in the middle of the inner cavity 10 as an isolation structure for each flow channel 100 in the inner cavity 10, and by connecting one end of these partitions 12 to the shell between the inlet 131 and the return port 132, each flow channel 100 in the inner cavity 10 forms a good circulation system, which can improve the circulation effect of the heat conductor in the inner cavity 10, thereby further improving the heat transfer and heat dissipation performance of the top cover.

[0047] For the material of the top cover, there are naturally many different structural options to choose from; for example, the top cover can be made of aluminum, stainless steel, or copper. When the heat pipe working fluid 4 is used as the heat conductor, ammonia, methanol, or water can be used as the phase change material. Using aluminum, stainless steel, or copper to make the top cover body 1 and cover plate 2 not only facilitates the structural construction, but also provides good thermal conductivity. Using ammonia, methanol, or water as the heat pipe working fluid 4 is easy to prepare, has a good phase change effect, and can enhance the heat transfer effect of the top cover's heat pipe.

[0048] In summary, the cell heat dissipation structure of this embodiment, by setting a heat conductor in the inner cavity 10 of the top cover and setting a cooling plate 6 on one side of the cell 5, allows the heat generated by the electrode group and its tabs to be transferred to the heat conductor in the top cover through the electrode post during high-current charging of the battery pack. The heat conductor can transfer the heat from the tabs and electrode post to the end of the top cover more efficiently, and then dissipate it to the outside of the battery pack through the cooling plate 6, which is beneficial to improving the cooling effect inside the cell 5 and at the electrode post.

[0049] An embodiment of the second aspect of this application provides a battery that employs the cell heat dissipation structure provided in Embodiment 1.

[0050] Traditional battery packs typically have low charging rates and long charging times, so they don't provide additional cooling for the terminals. Some only use localized cooling structures to cool the cell terminals. However, as many battery pack charging schemes require an overall increase in the charging rate, during high-current charging, the heat generated by the electrode tabs can only be exchanged with the outside environment through the internal structure of the terminal, resulting in slow heat exchange efficiency. The temperature rise of the electrode assembly is greatly affected by the heat generated by the tabs. Moreover, the heat generated at the cell terminals can be higher than the temperature rise of the cell assembly. If the temperature rise at the terminals is not controlled, sustained high temperatures will trigger the battery pack's over-temperature protection function, increasing the charging time and, in severe cases, affecting the battery's lifespan.

[0051] In this embodiment, the battery has cooling plates 6 arranged on the sides of each cell 5 inside the battery pack. The cooling plates 6 can be connected to the liquid cooling circulation system of the battery pack. The coolant 60 in the system circulates in the cooling plates 6 to remove the heat transferred from the top cover of the cell 5 to the cooling plates 6.

[0052] The top cover houses a heat pipe working fluid 4, fully utilizing the high thermal conductivity of heat pipe technology. When the heated end of the heat pipe (where the electrode is located) absorbs heat, the liquid working fluid evaporates into a gaseous state and diffuses towards the condensing end (cooling plate 6). The gaseous working fluid releases latent heat at the condensing end and re-liquefies, returning to the heated end through the capillary action of the wick 3, forming a continuous phase-change heat transfer cycle. The heat pipe utilizes the phase-change heat transfer of the working fluid, resulting in thermal conductivity far exceeding that of metals. The temperature difference between the evaporation and condensation ends is minimal, ensuring uniform heat transfer. The cycle relies entirely on capillary action and pressure difference, requiring no additional energy.

[0053] In this way, the battery temperature continues to rise under high-rate charging conditions. The heat generated at the tabs can be transferred through the terminals to the heat conductor in the inner cavity 10, and then through the end of the top cover to the cooling plate 6, before being carried away by the circulating coolant 60 to the outside of the battery pack. Therefore, by setting the cell heat dissipation structure of this application, the cell 5 can quickly transfer heat to the cooling plate 6, reducing the local high temperature of the cell 5, which is beneficial for accelerating the charging rate of the battery pack and reducing the impact of high temperature on the battery pack's lifespan.

[0054] The above description is merely a preferred embodiment of this application. Detailed explanations of configurations, examples of specific structural arrangements, and descriptions of assembly and connection methods are provided to ensure sufficient disclosure so that those skilled in the art can better implement this application, and are not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A cell heat dissipation structure, characterized in that: Includes a battery cell (5) and a cooling plate (6) disposed on one side of the battery cell (5); The top of the battery cell (5) is provided with a top cover, and a terminal post is installed on the top cover. The terminal post is connected to the electrode tabs led out from the electrode group inside the battery cell (5). The top cover has a hollow inner cavity (10) inside, and a heat conductor is provided in the inner cavity (10). One end of the top cover abuts against the cooling plate (6). The heat emitted by the electrode group is transferred to the heat conductor through the electrode tab and the electrode post, and then transferred to the cooling plate (6) through the heat conductor and the shell of the top cover.

2. The cell heat dissipation structure according to claim 1, characterized in that: The top cover includes a top cover body (1) and a cover plate (2) covering the top cover body (1); the inner cavity (10) is formed on the top cover body (1), and the cover plate (2) covers the top of the inner cavity (10) so that the inner cavity (10) is in a sealed state.

3. The cell heat dissipation structure according to claim 1, characterized in that: The inner cavity (10) is provided with a pole insertion platform (11), and the pole is inserted into the first pole through hole (110) provided on the pole insertion platform (11). The pole insertion platform (11) forms an isolation between the pole and the heat conductor.

4. The cell heat dissipation structure according to any one of claims 1 to 3, characterized in that: The inner cavity (10) is provided with a plurality of partitions (12), each of the partitions (12) is arranged along the length direction of the top cover, and a narrow flow channel (100) is formed between each partition (12), and the heat conductor flows in the flow channel (100).

5. The cell heat dissipation structure according to claim 4, characterized in that: The heat conductor includes a heat pipe working fluid (4) filled in each of the flow channels (100).

6. The cell heat dissipation structure according to claim 5, characterized in that: Each of the flow channels (100) is filled with a liquid wick (3), and a capillary structure is formed in the liquid wick (3). The heat pipe working fluid (4) is filled in the capillary structure of the liquid wick (3).

7. The cell heat dissipation structure according to claim 5, characterized in that: The top cover is made of aluminum, stainless steel or copper, and / or the heat pipe working fluid (4) is ammonia, methanol or water as a phase change material.

8. The cell heat dissipation structure according to claim 4, characterized in that: Coolant (60) circulates inside the cooling plate (6). The top cover abuts one end of the housing of the cooling plate (6) and has a connecting port (13). The coolant (60) enters and exits the inner cavity (10) through the connecting port (13) and flows in the flow channel (100) to form the heat conductor.

9. The cell heat dissipation structure according to claim 8, characterized in that: The connecting port (13) includes an inlet (131) and a return port (132) spaced apart. A set of partitions (12) in the middle of the inner cavity (10) is connected to the housing between the inlet (131) and the return port (132). Each flow channel (100) on one side of the set of partitions (12) forms an inlet flow channel (101) connecting the inlet (131), and each flow channel (100) on the other side forms a return flow channel (102) connecting the return port (132). The inlet channel (101) and the return channel (102) are connected at the other end of the inner cavity (10) relative to the end where the connecting port (13) is located.

10. A battery, characterized in that: The battery adopts the cell heat dissipation structure according to any one of claims 1 to 9.

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