Battery cell, battery pack and electric device

Abstract

The present application relates to the field of batteries. Provided are a battery cell (1), a battery pack and an electric device. The battery cell (1) comprises a casing (10), electrode assemblies (20) and electrode terminals (30). A plurality of electrode assemblies (20) are provided and are all disposed inside the casing (10), and the plurality of electrode assemblies (20) are arranged in sequence in the axial direction of the casing (10) and are sequentially connected in series. Two electrode terminals (30) are provided and are respectively mounted at two opposite ends of the casing (10), each electrode terminal (30) being electrically connected to the electrode assembly (20) adjacent thereto. On the basis of the foregoing structure, the battery cell (1) can increase an output voltage, thereby reducing the number of battery cells (1) and connection nodes in the battery pack, decreasing the workload of node connection, improving the assembly efficiency of the battery pack, lowering the risk of poor node connection, and enhancing the overall performance and safety performance of the battery pack.

Description

Battery cells, battery packs and electrical devices

[0001] This application claims priority to two Chinese patent applications filed on August 2, 2024, with the State Intellectual Property Office of the People's Republic of China, with application numbers 202411063004.4 and 202421866614.3, both entitled "Battery Cell, Battery Pack and Electrical Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application belongs to the field of battery technology, and in particular relates to a battery cell, a battery pack, and an electrical device. Background Technology

[0003] Currently, the common voltages of battery packs in new energy vehicles are 336V, 384V, and 750V. The voltage of individual battery cells is typically 3V to 4.2V. Based on this, a 336V battery pack requires 105 battery cells connected in series, a 384V battery pack requires 120 battery cells connected in series, and a 750V battery pack requires 234 battery cells connected in series. This results in numerous connection nodes within the battery pack, leading to a significant workload for node connections and a higher risk of faulty connections. Technical issues

[0004] This application provides a battery cell, a battery pack, and an electrical device, aiming to solve the problem that the presence of numerous connection nodes within the battery pack results in a large workload for node connection and a high risk of poor node connection. Technical solutions

[0005] To achieve the above objectives, the technical solution adopted in the embodiments of this application is as follows:

[0006] In a first aspect, a battery cell is provided, comprising:

[0007] The outer shell is cylindrical.

[0008] Multiple electrode assemblies are provided, all of which are disposed within the housing. The multiple electrode assemblies are arranged sequentially and connected in series along the axial direction of the housing.

[0009] The electrode terminals are provided in two form, with opposite polarities. The two electrode terminals are respectively installed at opposite ends of the housing, and are electrically connected to the electrode assembly disposed adjacent to them.

[0010] Secondly, a battery pack is provided, including the battery cells provided in the embodiments of this application.

[0011] Thirdly, a battery pack is provided, including a plurality of battery cells provided in the embodiments of this application, an input pipe, an output pipe, and at least one U-shaped pipe, wherein the input pipe is connected to the heat exchange pipe of one of the battery cells, the output pipe is connected to the heat exchange pipe of another battery cell, and the U-shaped pipe is connected to the heat exchange pipes of both battery cells.

[0012] Fourthly, an electrical device is provided, including the battery pack provided in the embodiments of this application. Beneficial effects

[0013] The beneficial effects of the battery cell provided in this application are as follows:

[0014] The battery cell provided in this embodiment can be modularized, integrated, and structurally optimized based on a casing, multiple electrode components housed within the casing and arranged sequentially along the casing's axial direction, and two electrode terminals respectively installed at both ends of the casing. Furthermore, this battery cell can realize the input and output of electrical energy based on the electrical connection between the electrode terminals and adjacent electrode components, as well as the sequential series connection of each electrode component. This maintains and improves the battery cell's performance and electrochemical performance, shortens the current path, reduces energy loss during charging and discharging, and improves energy transfer efficiency. Moreover, based on the above structure, the output voltage of the battery cell can be equal to the sum of the voltages of all electrode components. Therefore, compared to existing battery cells, the battery cell provided in this embodiment can increase its output voltage. Consequently, for battery packs using the battery cell provided in this embodiment, the number of battery cells and connection nodes within the battery pack can be reduced, reducing the workload of node connection, improving battery pack assembly efficiency, reducing the risk of poor node connection, ensuring that the battery pack's current and internal resistance meet requirements, and maintaining and improving the overall performance and safety of the battery pack. Attached Figure Description

[0015] To clearly illustrate the technical solutions in the embodiments of this application, 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 is a perspective view of a battery cell provided in some embodiments of this application;

[0017] Figure 2 is a front view of the battery cell shown in Figure 1;

[0018] Figure 3 is a cross-sectional view along AA provided in Figure 2;

[0019] Figure 4 is an enlarged view of region B provided in Figure 3;

[0020] Figure 5 is an enlarged view of region C provided in Figure 3;

[0021] Figure 6 is a front view of a battery cell provided in some other embodiments of this application, wherein the heat exchange channel is waist-shaped when projected along the axial direction of the outer casing.

[0022] Figure 7 is a perspective view of a battery pack provided in some embodiments of this application;

[0023] Figure 8 is an exploded view of the battery pack shown in Figure 7;

[0024] Figure 9 is an enlarged view of region D provided in Figure 8.

[0025] The following are the labeling elements in the figure:

[0026] 1-Battery cell, 2-Input fitting, 3-Output fitting, 4- U-shaped fitting, 5-box body, 501-limiting groove; 10-outer shell, 11-shell, 12-end cap, 13-insulating connector, 131-first ring, 132-second ring, 133-third ring; 20-electrode assembly, 21-positive electrode tab, 22-negative electrode tab; 30-electrode terminal, 30a-positive electrode terminal, 30b-negative electrode terminal, 31-perforation, 311-first hole section, 312-second hole section, 313-annular groove, 32-main body, 33-flange, 40-heat exchange fitting, 41-heat exchange channel; 50-first seal, 51-first sealing part, 52-second sealing part; 60-first insulating film, 61-annular protrusion; 70-second seal, 80-explosion-proof valve, 90-injection hole, 100-second insulating film. Embodiments of the present invention

[0027] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clear, the application will be described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.

[0028] In this application, "axial" refers to the direction of extension of the central axis of the corresponding structure, and "circumferential" refers to the direction of circumference of the ring formed by the outer circumferential surface of the corresponding structure. In this application, a battery cell is the smallest unit for storing and outputting electrical energy. A battery pack is a modular structure comprising at least two battery cells to provide higher voltage and capacity.

[0029] Currently, the common voltages of battery packs in new energy vehicles are 336V, 384V, and 750V. The voltage of individual battery cells is typically 3V to 4.2V. Based on this, a 336V battery pack requires 105 battery cells connected in series, a 384V battery pack requires 120 battery cells connected in series, and a 750V battery pack requires 234 battery cells connected in series. The numerous connection nodes between two connected battery cells result in a large workload for node connection and a higher risk of poor connection. This leads to lower assembly efficiency and makes the battery pack prone to poor connection, affecting its safety performance and overall performance such as current and internal resistance. For example, it may cause reduced current, increased internal resistance, fire, combustion, or explosion.

[0030] Therefore, this application provides a battery cell that can increase its own output voltage, reduce the number of battery cells and connection nodes in the battery pack in which it is used, thereby reducing the workload of node connection, improving the assembly efficiency of the battery pack, reducing the risk of poor node connection, ensuring that the current and internal resistance of the battery pack meet the requirements, and maintaining and improving the overall performance and safety performance of the battery pack.

[0031] The specific implementation of this application will be described in detail below with reference to specific embodiments:

[0032] Please refer to Figures 1, 2, 3, and 4. Some embodiments of this application provide a battery cell 1, including a housing 10, electrode assemblies 20, and electrode terminals 30. The housing 10 is cylindrical. Multiple electrode assemblies 20 are provided, all disposed within the housing 10, and are sequentially arranged and connected in series along the axial direction of the housing 10. Two electrode terminals 30 are provided, with opposite polarities, and are respectively mounted at opposite ends of the housing 10. The electrode terminals 30 are electrically connected to the adjacent electrode assemblies 20.

[0033] It should be noted that the outer casing 10 is the component that primarily isolates the internal environment of the battery cell 1 from the external environment. The outer casing 10 is a hollow cylindrical shape, such as a cylinder or a prism. The axial direction of the outer casing 10, which is the direction of extension of the central axis of the outer casing 10, also corresponds to the length direction of the battery cell 1.

[0034] Electrode assembly 20 is the component in the battery cell 1 where the electrochemical reaction occurs. Multiple electrode assemblies 20 are disposed within the casing 10, and these assemblies 20 are arranged sequentially along the axial direction of the casing 10. Referring to Figure 5, the electrode assembly 20 includes two sets of electrodes with opposite polarities and a separator. The two sets of electrodes with opposite polarities are the positive electrode and the negative electrode, respectively, and the separator separates the positive and negative electrodes. The positive electrode, separator, and negative electrode can be formed into the electrode assembly 20 by winding. In the electrode assembly 20, the portion of the positive electrode without active material constitutes the positive electrode tab 21, and the portion of the negative electrode without active material constitutes the negative electrode tab 22. The positive electrode tab 21 and the negative electrode tab 22 are the current transmission terminals of the electrode assembly 20, used for transmitting current. The positive electrode tab 21 and the negative electrode tab 22 are located at opposite ends of the electrode assembly 20 along the axial direction of the casing 10.

[0035] Electrode terminals 30 (also called poles) are components electrically connected to electrode assembly 20 and used for outputting or inputting electrical energy. There are two electrode terminals 30 with opposite polarities; one electrode terminal 30 is the positive electrode terminal 30a, and the other is the negative electrode terminal 30b. The two electrode terminals 30 are respectively mounted at opposite ends of the housing 10 (along the axial direction of the housing 10), ensuring that both electrode terminals 30 are stably positioned and in a stable state relative to the housing 10.

[0036] The positive electrode tabs 21 of all electrode assemblies 20 are located at the end of the electrode assembly 20 facing the positive electrode terminal 30a. The negative electrode tabs 22 of all electrode assemblies 20 are located at the end of the electrode assembly 20 facing the negative electrode terminal 30b. Based on this, between two adjacent electrode assemblies 20, the negative electrode tab 22 of one electrode assembly 20 and the positive electrode tab 21 of another electrode assembly 20 can face each other, thus forming an electrical connection and connecting the two adjacent electrode assemblies 20 in series. Similarly, the electrode assemblies 20 can be connected in series sequentially along the axial direction of the housing 10. The electrical connection between the negative electrode tab 22 of an electrode assembly 20 and the positive electrode tab 21 of an adjacent electrode assembly 20 can be achieved by, but is not limited to, welding.

[0037] The electrode assembly 20 closest to the positive electrode terminal 30a can have its positive electrode tab 21 facing the positive electrode terminal 30a, facilitating electrical connection between the positive electrode terminal 30a and the positive electrode tab 21 of the adjacent electrode assembly 20. The electrode assembly 20 closest to the negative electrode terminal 30b can have its negative electrode tab 22 facing the negative electrode terminal 30b, facilitating electrical connection between the negative electrode terminal 30b and the negative electrode tab 22 of the adjacent electrode assembly 20. This facilitates electrical connection between the two electrode terminals 30 and each electrode assembly 20, enabling the output or input of electrical energy. The electrode terminals 30 and their adjacent electrode assemblies 20 can be directly electrically connected, or indirectly connected via other components (such as adapter plates). The electrical connection can be achieved through methods such as welding, but is not limited to this.

[0038] In summary, the battery cell 1 provided in this embodiment can be modularized, integrated, and structurally optimized based on a housing 10, multiple electrode assemblies 20 housed within the housing 10 and arranged sequentially along the axial direction of the housing 10, and two electrode terminals 30 respectively installed at both ends of the housing 10. Furthermore, the battery cell 1 can realize the input (i.e., storage) and output of electrical energy based on the electrical connection between the electrode terminals 30 and their adjacent electrode assemblies 20, and the sequential series connection of the electrode assemblies 20. This maintains and improves the performance and electrochemical properties of the battery cell 1, shortens the current path, reduces energy loss during charging and discharging, and improves energy transfer efficiency. Moreover, based on the above structure, the output voltage of the battery cell 1 can be equal to the sum of the voltages of each electrode assembly 20. Therefore, compared to existing battery cells, the battery cell 1 provided in this embodiment can increase its output voltage. Therefore, for a battery pack using the battery cell 1 provided in this embodiment, the number of battery cells 1 and the number of connection nodes in the battery pack can be reduced, the workload of node connection can be reduced, the assembly efficiency of the battery pack can be improved, the risk of poor node connection can be reduced, the current and internal resistance of the battery pack can meet the requirements, and the overall performance and safety performance of the battery pack can be maintained and improved.

[0039] For example, in one specific application example, the housing 10 has five electrode assemblies 20 connected in series, each electrode assembly 20 having a voltage of approximately 3.2V, and the output voltage of the battery cell 1 can reach 16V. Based on this, a 336V battery pack uses approximately 21 battery cells 1 provided in this embodiment, a 384V battery pack uses approximately 24 battery cells 1 provided in this embodiment, and a 750V battery pack uses approximately 47 battery cells 1 provided in this embodiment. Compared to the battery packs of the prior art that use hundreds of battery cells, the number of battery cells 1 and the number of connection nodes can be significantly reduced, and the risk of battery pack failure due to poor node connections can be significantly reduced.

[0040] Please refer to Figures 1, 3, and 4. In some embodiments of this application, the electrode terminal 30 is provided with a through hole 31 along its axial direction. The battery cell 1 also includes a heat exchange tube 40, which passes through the through hole 31 of the two electrode terminals 30. The electrode assembly 20 is wound around the outer periphery of the heat exchange tube 40.

[0041] It should be noted that the electrode terminal 30 is provided with a through hole 31, which extends through the electrode terminal 30 along its axial direction. The axial direction of the electrode terminal 30 is the extension direction of its central axis, which also corresponds to the axial direction of the outer casing 10. The heat exchange tube 40 is a tubular structure, which passes through the through holes 31 of the two electrode terminals 30. The electrode assembly 20 is wound around the outer periphery of the heat exchange tube 40. Based on this, the heat exchange tube 40 passes through the middle of each electrode assembly 20 and the middle of the two electrode terminals 30, so that the internal space of the heat exchange tube 40 can form a heat exchange channel 41 that extends through the battery cell 1 along the axial direction of the outer casing 10. The heat exchange channel 41 can be used to flow heat exchange fluid. Therefore, the heat exchange tube 40 can be thermally connected to the electrode assembly 20 to facilitate heat exchange between the heat exchange fluid within the heat exchange tube 40 and the electrode assembly 20, particularly facilitating heat dissipation from the electrode assembly 20 by the heat exchange fluid within the heat exchange tube 40. Furthermore, the heat exchange tube 40 can be thermally connected to the electrode terminal 30 to facilitate heat exchange between the heat exchange fluid within the heat exchange tube 40 and the electrode terminal 30, particularly facilitating heat dissipation from the electrode terminal 30 by the heat exchange fluid within the heat exchange tube 40. The heat exchange fluid can be a liquid or a gas, and can be, but is not limited to, water, a mixture of water and ethylene glycol, or air. Along the axial direction of the outer shell 10, the projected shape of the heat exchange channel 41 can be, but is not limited to, circular (as shown in Figure 2), waist-shaped (as shown in Figure 6), rectangular, etc., and the projected shape of the heat exchange tube 40 can be, but is not limited to, circular (as shown in Figure 2), waist-shaped (as shown in Figure 6), rectangular, etc., and the projected shape of the battery cell 1 can be, but is not limited to, circular (as shown in Figure 2), waist-shaped (as shown in Figure 6), rectangular, etc. The projected shape of the heat exchange tube 40 and the projected shape of the heat exchange channel 41 can be the same or different.

[0042] By adopting the above scheme, the battery cell 1 can pass through the heat exchange tube 40, both in the middle of each electrode assembly 20 and through the through holes 31 of the two electrode terminals 30. Based on this, a heat exchange channel 41 that runs through the battery cell 1 along the axial direction of the outer casing 10 can be easily formed through the internal space of the heat exchange tube 40. The heat exchange fluid can flow through the heat exchange channel 41, thereby facilitating heat exchange between the heat exchange fluid in the heat exchange tube 40 and the electrode assembly 20 and electrode terminals 30. In particular, it is convenient for the heat exchange fluid in the heat exchange tube 40 to dissipate heat from the electrode assembly 20 and electrode terminals 30. Furthermore, the heat exchange fluid within the heat exchange tube 40 can directly and quickly regulate the heat in the center of the electrode assembly 20 and the electrode terminal 30. It can also diffuse circumferentially along the heat exchange tube 40, evenly regulating the heat at the edges of the electrode assembly 20 and the electrode terminal 30. This reduces the imbalance between the central and edge heat of the electrode assembly 20 and electrode terminal 30, balancing the heat distribution within the battery cell 1 and reducing localized overheating. Consequently, the risk of thermal runaway in the battery cell 1 is reduced, improving its performance stability, reliability, safety, and lifespan. Moreover, the heat exchange tube 40, in conjunction with the outer casing 10, provides support for the electrode assembly 20 and electrode terminal 30, thereby optimizing the structure of the battery cell 1, enhancing its mechanical strength and vibration resistance, and contributing to stable battery operation under complex conditions.

[0043] Please refer to Figures 1, 3, and 4. In some embodiments of this application, a first sealing element 50 is provided between the wall of the perforation 31 and the outer periphery of the heat exchange tube 40. The first sealing element 50 seals the gap between the perforation 31 and the heat exchange tube 40. It should be noted that the first sealing element 50 is a component with sealing performance. The first sealing element 50 is annularly arranged and sleeved between the wall of the perforation 31 and the outer periphery of the heat exchange tube 40. The first sealing element 50 seals the gap between the wall of the perforation 31 and the outer periphery of the heat exchange tube 40. Two first sealing elements 50 are also provided corresponding to the two perforations 31 of the two electrode terminals 30.

[0044] By adopting the above solution, the gap between the hole wall of the perforation 31 and the outer periphery of the heat exchange tube 40 can be sealed by the first sealing element 50, thereby improving the sealing performance between the hole wall of the perforation 31 and the outer periphery of the heat exchange tube 40. Based on this, it can prevent liquid (e.g., electrolyte) inside the battery cell 1 from leaking out through the gap between the perforation 31 and the heat exchange tube 40, prevent gas generated during the charging and discharging process of the battery cell 1 from overflowing through the gap between the perforation 31 and the heat exchange tube 40, and prevent external dust, moisture, and other impurities from entering the battery cell 1 through the gap between the perforation 31 and the heat exchange tube 40. This can reduce the risk of performance degradation and safety hazards caused by liquid leakage, gas overflow, and impurity contamination of the battery cell 1, maintain the stability of the internal environment of the battery cell 1, and improve the reliability, safety, and service life of the battery cell 1.

[0045] In some embodiments, the first seal 50 is an insulating sealant. This arrangement enables the first seal 50 to have insulating properties, thereby achieving electrical insulation between the wall of the perforation 31 and the outer periphery of the heat exchange tube 40 via the first seal 50. Of course, in other embodiments, electrical insulation between the wall of the perforation 31 and the outer periphery of the heat exchange tube 40 may be achieved via other components (e.g., an insulating film).

[0046] Of course, in other embodiments, other methods can be used to achieve the sealing treatment between the perforation 31 and the heat exchange tube 40, for example, sealant can be applied along the outer hole of the perforation 31.

[0047] Please refer to Figures 1, 3, and 4. In some embodiments of this application, the perforation 31 includes a first hole segment 311 and a second hole segment 312 arranged sequentially from the outside to the inside. The diameter of the first hole segment 311 is larger than the diameter of the second hole segment 312. The first sealing member 50 includes a first sealing part 51 and a second sealing part 52. The first sealing part 51 is disposed within the first hole segment 311 and stops at the bottom of the hole of the first hole segment 311, and the second sealing part 52 is disposed within the second hole segment 312.

[0048] It should be noted that the perforation 31 is divided into a first segment 311 and a second segment 312. The first segment 311 is located on the outer side of the second segment 312, and the first segment 311 and the second segment 312 are connected. The diameter of the first segment 311 is larger than the diameter of the second segment 312, that is, along the through direction of the perforation 31, the projection of the second segment 312 falls within the projection of the first segment 311. Correspondingly, the first sealing member 50 fitted inside the perforation 31 includes a first sealing part 51 and a second sealing part 52. The first sealing part 51 is adapted to fit between the wall of the first segment 311 and the outer periphery of the heat exchange tube 40, and seals the gap between the wall of the first segment 311 and the outer periphery of the heat exchange tube 40. The second sealing part 52 is adapted to fit between the wall of the second segment 312 and the outer periphery of the heat exchange tube 40, and seals the gap between the wall of the second segment 312 and the outer periphery of the heat exchange tube 40. Since the diameter of the first hole section 311 is larger than the diameter of the second hole section 312, the first sealing part 51 will stop at the bottom of the first hole section 311 near the second hole section 312, that is, it will stop at the step between the first hole section 311 and the second hole section 312, thereby stabilizing the position and state of the first sealing member 50 relative to the through hole 31.

[0049] By adopting the above scheme, a first sealing barrier can be formed between the wall of the first hole section 311 and the outer periphery of the heat exchange tube 40 by fitting the first sealing part 51 between the hole wall of the first hole section 311 and the outer periphery of the heat exchange tube 40, and by stopping the first hole section 311 near the bottom of the second hole section 312. A second sealing barrier can also be formed between the wall of the second hole section 312 and the outer periphery of the heat exchange tube 40 by fitting the second sealing part 52 between the hole wall of the second hole section 312 and the outer periphery of the heat exchange tube 40. Based on this, the position and state of the first sealing element 50 relative to the perforation 31 can be stabilized, reducing the risk of loosening or displacement of the first sealing element 50 relative to the perforation 31. Furthermore, the segmented sealing design provides multiple layers of protection, thereby improving the sealing reliability of the first sealing element 50 between the perforation 31 and the heat exchange tube 40 and reducing the risk of sealing failure of the first sealing element 50.

[0050] Of course, in other embodiments, the perforation 31 may not be designed with segmented holes, or it may be divided into at least three segments. The first sealing element 50 may be designed to correspond to the perforation 31.

[0051] Referring to Figures 1, 3, and 4, in some embodiments of this application, the wall of the perforation 31 is provided with an annular groove 313, and a portion of the first sealing member 50 is embedded in the annular groove 313. It should be noted that the wall of the perforation 31 is provided with at least one annular groove 313. When multiple annular grooves 313 are provided, the multiple annular grooves 313 can be distributed at intervals along the axial direction of the perforation 31. The annular grooves 313 extend circumferentially along the perforation 31. The annular grooves 313 can be closed annular or open annular. The portion of the first sealing member 50 corresponding to the annular groove 313 is embedded in the annular groove 313.

[0052] By adopting the above solution, the contact area between the first seal 50 and the wall of the perforation 31 can be increased by partially embedding the first seal 50 into the annular groove 313. Based on this, the tightness, durability, reliability, and stability of the sealing connection between the first seal 50 and the perforation 31 can be improved. The position and state of the first seal 50 relative to the perforation 31 can be stabilized, reducing the risk of the first seal 50 detaching from the wall of the perforation 31 under external pressure or vibration. Furthermore, the portion of the first seal 50 embedded in the annular groove 313 provides tolerance for the first seal 50, ensuring it maintains a good sealing effect even under the influence of temperature changes, material aging, and other factors. This improves the sealing reliability of the first seal 50 between the perforation 31 and the heat exchange tube 40, reducing the risk of seal failure.

[0053] This embodiment is suitable for use in conjunction with the previous embodiment to comprehensively improve the sealing reliability of the first sealing element 50 between the perforation 31 and the heat exchange tube 40. As shown in FIG4, in some embodiments, the wall of the second hole section 312 of the perforation 31 is provided with an annular groove 313.

[0054] Please refer to Figures 1, 3, 4, and 5. In some embodiments of this application, the battery cell 1 includes a first insulating film 60. The first insulating film 60 surrounds the outer periphery of the heat exchange tube 40 and insulatingly isolates the heat exchange tube 40 from the electrode assembly 20. It should be noted that the first insulating film 60 is a film-like structure with insulating properties. The first insulating film 60 surrounds and is wound around the outer periphery of the heat exchange tube 40. The first insulating film 60 can cover the area of ​​the outer periphery of the heat exchange tube 40 corresponding to the electrode assembly 20, thereby insulating and isolating the heat exchange tube 40 from the electrode assembly 20, and thus electrically insulating the heat exchange tube 40 from the electrode assembly 20.

[0055] By adopting the above solution, the heat exchange tube 40 and the electrode assembly 20 can be electrically isolated by the first insulating film 60 surrounding or winding around the outer periphery of the heat exchange tube 40. Based on this, the risk of short circuit between the heat exchange tube 40 and the electrode assembly 20 can be reduced, and the reliability, safety and service life of the battery cell 1 can be improved.

[0056] In some embodiments, the first insulating film 60 may also cover the area of ​​the outer periphery of the heat exchange tube 40 corresponding to the electrode terminal 30, or even cover the entire area of ​​the outer periphery of the heat exchange tube 40. Based on this, the first insulating film 60 can both insulate and isolate the heat exchange tube 40 from the electrode assembly 20 and from the electrode terminal 30, thereby enabling the heat exchange tube 40 to be electrically insulated from the electrode assembly 20 and from the electrode terminal 30 respectively. This reduces the risk of short circuits between the heat exchange tube 40 and the electrode assembly 20 and between the heat exchange tube 40 and the electrode terminal 30, and improves the reliability, safety, and service life of the battery cell 1.

[0057] Of course, in other embodiments, where electrical insulation between the heat exchange tube 40 and the electrode terminal 30 is achieved via other components (e.g., insulating sealant), the first insulating film 60 may not need to cover the area of ​​the outer periphery of the heat exchange tube 40 corresponding to the electrode terminal 30.

[0058] Referring to Figures 1, 3, and 5, in some embodiments of this application, the first insulating film 60 is provided with an annular protrusion 61. The annular protrusion 61 is disposed between two adjacent electrode assemblies 20 and insulatingly separates the two adjacent electrode assemblies 20. It should be noted that the first insulating film 60 may have its winding thickness increased between two adjacent electrode assemblies 20 to form the annular protrusion 61. The annular protrusion 61 may be disposed between two adjacent electrode assemblies 20 and insulatingly separate the two adjacent electrode assemblies 20.

[0059] By adopting the above solution, an insulating barrier can be formed between two adjacent electrode assemblies 20 through the annular protrusion 61 provided between them, thus isolating the two adjacent electrode assemblies 20. Based on this, the risk of short circuit due to direct contact between adjacent electrode assemblies 20 can be reduced, improving the reliability, safety, and service life of the battery cell 1. Furthermore, the annular protrusion 61 can also, to a certain extent, limit and position the two adjacent electrode assemblies 20, thereby stabilizing the position of multiple electrode assemblies 20 on the outer periphery of the heat exchange tube 40, improving the structural reliability and stability of the battery cell 1.

[0060] Of course, in other embodiments, the heat exchange tube 40 may have a protrusion between two adjacent electrode assemblies 20 on its outer periphery, and the portion of the first insulating film 60 wound around the protrusion may also serve the function of "insulating and separating two adjacent electrode assemblies 20".

[0061] Please refer to Figures 1 and 3. In some embodiments of this application, the end of the heat exchange tube 40 protrudes beyond the outer end face of the electrode terminal 30. It should be noted that the outer end face of the electrode terminal 30 is the end face of the electrode terminal 30 facing the outside of the battery cell 1.

[0062] By adopting the above scheme, by making the end of the heat exchange tube 40 protrude from the outer end face of the electrode terminal 30, it is convenient for the heat exchange tube 40 to be connected and communicated with other thermal management channels of the battery pack (such as the input tube 2, output tube 3 or U-shaped tube 4 shown in Figures 7, 8 and 9) through the part of the heat exchange tube 40 protruding from the outer end face of the electrode terminal 30. This can improve the connection convenience between the heat exchange tube 40 of the battery cell 1 and other components of the battery pack, promote the flow and distribution of heat exchange fluid in the battery pack, and improve the assembly convenience and heat dissipation performance of the battery pack using the battery cell 1.

[0063] Of course, in other embodiments, the end of the heat exchange tube 40 may be flush with the outer end face of the electrode terminal 30.

[0064] Please refer to Figures 1, 3, and 4. In some embodiments of this application, the electrode terminal 30 and the housing 10 are sealed together by a second sealing member 70. It should be noted that the second sealing member 70 is a component with sealing properties. The second sealing member 70 is annularly arranged and is sleeved between the outer periphery of the electrode terminal 30 and the housing 10. The second sealing member 70 seals the gap between the outer periphery of the electrode terminal 30 and the housing 10. For each pair of electrode terminals 30, two second sealing members 70 are correspondingly provided.

[0065] By adopting the above solution, the gap between the outer periphery of the electrode terminal 30 and the outer casing 10 can be sealed by the second sealing element 70, thereby improving the sealing performance between the outer periphery of the electrode terminal 30 and the outer casing 10. Based on this, it can prevent liquid (e.g., electrolyte) inside the battery cell 1 from leaking out through the gap between the outer periphery of the electrode terminal 30 and the outer casing 10, prevent gas generated during the charging and discharging of the battery cell 1 from overflowing through the gap between the outer periphery of the electrode terminal 30 and the outer casing 10, and prevent external dust, moisture, and other impurities from entering the battery cell 1 through the gap between the outer periphery of the electrode terminal 30 and the outer casing 10. This can reduce the risk of performance degradation and safety hazards caused by liquid leakage, gas overflow, and impurity contamination of the battery cell 1, maintain the stability of the internal environment of the battery cell 1, and improve the reliability, safety, and service life of the battery cell 1.

[0066] In some embodiments, the second seal 70 is an insulating sealant. This arrangement enables the second seal 70 to have insulating properties, thereby achieving electrical insulation between the outer periphery of the electrode terminal 30 and the housing 10 via the second seal 70. Of course, in other embodiments, electrical insulation between the outer periphery of the electrode terminal 30 and the housing 10 may be achieved via other components (e.g., insulating connector 13).

[0067] Please refer to Figures 1, 3, and 4. In some embodiments of this application, the electrode terminal 30 includes a main body 32 and a flange 33. The flange 33 is connected to the outer end of the main body 32 and extends outward along the circumference of the main body 32. A second seal 70 surrounds the outer periphery of the main body 32, sealingly abutting against the outer peripheral surface of the main body 32 and sealingly abutting against the end face of the flange 33 facing thereto.

[0068] It should be noted that the main body 32 of the electrode terminal 30 is installed through the housing 10 and electrically connected to the electrode assembly 20 disposed adjacent to it. The flange 33 of the electrode terminal 30 is connected to the outer end of the main body 32 near the outside of the battery cell 1. The flange 33 extends outward in the circumferential direction relative to the main body 32, forming a stepped structure between the flange 33 and the main body 32. The second seal 70 is annularly arranged and is sleeved between the outer periphery of the main body 32 and the housing 10. The inner annular surface of the second seal 70 seals against the outer peripheral surface of the main body 32. The side of the second seal 70 facing the flange 33 seals against the side of the flange 33 facing the second seal 70.

[0069] By adopting the above solution, the inner annular surface of the second seal 70 can seal against the outer peripheral surface of the main body 32, and the sides of the second seal 70 and the flange 33 facing each other can seal against each other. Based on this, two sealing surfaces can be formed between the second seal 70 and the electrode terminal 30, which can increase the sealing area between the second seal 70 and the electrode terminal 30, improve the tightness, durability, reliability and stability of the sealing connection between the second seal 70 and the electrode terminal 30, reduce the risk of the second seal 70 loosening or shifting relative to the electrode terminal 30, thereby improving the sealing reliability of the second seal 70 between the electrode terminal 30 and the housing 10, and reducing the risk of sealing failure of the second seal 70.

[0070] Of course, in other embodiments, the electrode terminal 30 may adopt other structural designs. For example, the electrode terminal 30 may omit the flange portion 33, or the electrode terminal 30 may have more portions to form more stepped structures, or the outer peripheral surface of the electrode terminal 30 may have a groove for installing the second seal 70.

[0071] Please refer to Figures 1, 3, and 4. In some embodiments of this application, the outer casing 10 includes a housing 11 and two end caps 12. The housing 11 is cylindrical, and the two end caps 12 are respectively installed at the two ends of the housing 11, both of which are annular. At at least one end of the housing 11, an insulating connector 13 is installed within the annulus of the end cap 12. The insulating connector 13 is annular, and the electrode terminal 30 passes through the annulus of the insulating connector 13. A portion of the insulating connector 13 is embedded in the second sealing member 70.

[0072] It should be noted that the housing 11 is cylindrical, such as a round or polygonal cylinder. The internal space of the housing 11 can be used to accommodate the electrode assembly 20, etc. Two end caps 12 are provided, and the two end caps 12 are respectively installed at the two ends of the housing 11. The end caps 12 are annular, and the outer edge of the end cap 12 is sealed to the edge of the opening of the housing 11.

[0073] At one end or both ends of the housing 11 along its axial direction: an annular insulating connector 13 may be added within the ring of the end cap 12. The insulating connector 13 has insulating properties at least on its outer surface. The insulating connector 13 is sealed to the end cap 12, and the space within the ring of the insulating connector 13 is used for the power supply terminal 30 to pass through. In this case, the electrode terminal 30 can be installed in the housing 10 by passing through the ring of the insulating connector 13. Furthermore, the electrode terminal 30 can be electrically insulated relative to the housing 10 based on the insulating properties of the insulating connector 13, thereby reducing the risk of short circuit between the electrode terminal 30 and the housing 10. In addition, a portion of the insulating connector 13 can also be embedded in a second seal 70 around the electrode terminal 30 to improve the tightness of the sealing connection between the housing 10 and the second seal 70.

[0074] In some embodiments, the outer surface of the insulating connector 13 is provided with an insulating layer, so that the outer surface of the insulating connector 13 has insulating properties. In other embodiments, the insulating connector 13 is made entirely of insulating material, so that the insulating connector 13 has insulating properties as a whole.

[0075] By adopting the above scheme, a cylindrical outer shell 10 can be basically formed based on the cylindrical shell 11 and two annular end caps 12. Based on this, an annular space can be formed at one end or opposite ends of the shell 11 along its axial direction via an annular insulating connector 13 installed within the annulus of the end cap 12, allowing the electrode terminal 30 to pass through. This facilitates the electrode terminal 30's installation within the annulus of the insulating connector 13. Furthermore, since the insulating connector 13 has insulating properties at least on its outer surface, it promotes electrical insulation between the electrode terminal 30 and the insulating connector 13, thereby promoting electrical insulation between the electrode terminal 30 and the outer shell 10. This reduces the risk of short circuits between the electrode terminal 30 and the outer shell 10, improving the reliability, safety, and service life of the battery cell 1. Furthermore, by partially embedding the insulating connector 13 into the second seal 70 around the electrode terminal 30, the connection tightness and strength between the insulating connector 13 and the second seal 70 are enhanced. Based on this, the tightness, durability, reliability and stability of the sealing connection between the second seal 70 and the housing 10 can be improved, thereby improving the sealing reliability of the second seal 70 between the electrode terminal 30 and the housing 10 and reducing the risk of sealing failure of the second seal 70.

[0076] Of course, in other embodiments, at one end or opposite ends of the housing 11 along its axial direction: the insulating connector 13 may be omitted, the electrode terminal 30 may be directly inserted into the ring of the end cap 12, and part of the end cap 12 may be embedded in the second seal 70.

[0077] Please refer to Figures 1, 3, and 4. In some embodiments of this application, the insulating connector 13 includes a first ring portion 131, a second ring portion 132, and a third ring portion 133. The electrode terminal 30 passes through the ring of the first ring portion 131. The second ring portion 132 is connected to the inner end of the first ring portion 131 and extends outward along the circumference of the first ring portion 131. The third ring portion 133 is connected to the outer ring of the second ring portion 132 and is mounted on the inner end face of the end cap 12. At least a portion of the second ring portion 132 and the first ring portion 131 are embedded in the second seal 70.

[0078] It should be noted that the electrode terminal 30 passes through the ring of the first ring portion 131, that is, the first ring portion 131 is arranged around the outer periphery of the electrode terminal 30. The second ring portion 132 is connected to the inner end of the first ring portion 131 near the inside of the battery cell 1. The second ring portion 132 extends outward along the circumference of the first ring portion 131 relative to the first ring portion 131, such that the second ring portion 132 intersects (for example, perpendicular to) the first ring portion 131. The third ring portion 133 is connected to the outer ring of the second ring portion 132. The third ring portion 133 stops at, abuts against, and is fixedly installed on the inner end face of the end cover 12 near the inside of the battery cell 1. The third ring portion 133 and the inner end face of the end cover 12 can be fixedly connected by, but is not limited to, welding. Among them, the first ring portion 131, the corner of the first ring portion 131 and the second ring portion 132, and part or all of the second ring portion 132 are embedded in the second sealing member 70.

[0079] By adopting the above scheme, the insulating connector 13 can be stopped, abutted, and fixedly installed on the inner end face of the end cover 12 near the inside of the battery cell 1 via the third ring portion 133, so that its overall installation position and installation state are stable relative to the end cover 12. The insulating connector 13 can also be supported between the third ring portion 133 and the first ring portion 131 via the second ring portion 132, and can also form an inner ring space through which the electrode terminal 30 can pass, so that the electrode terminal 30 can pass through the inner ring of the insulating connector 13. Based on this, the structure of the insulating connector 13 can be optimized, and the convenience of the fit between the insulating connector 13 and the end cover 12 and the electrode terminal 30 can be improved. On this basis, by embedding at least a part of the second ring portion 132 and the first ring portion 131 into the second sealing member 70, the first ring portion 131, the corner of the first ring portion 131 and the second ring portion 132, and even the entire second ring portion 132 can be embedded in the second sealing member 70. Based on this, the connection area between the insulating connector 13 and the second seal 70 can be increased, thereby enhancing the connection tightness and strength between them and reducing the risk of loosening or displacement of the insulating connector 13 relative to the second seal 70. This improves the tightness, durability, reliability, and stability of the sealing connection between the second seal 70 and the insulating connector 13, thus enhancing the sealing reliability of the second seal 70 between the electrode terminal 30 and the housing 10 and reducing the risk of seal failure of the second seal 70.

[0080] Of course, in other embodiments, the insulating connector 13 may adopt other structural designs. For example, the insulating connector 13 may omit either the first ring portion 131 or the second ring portion 132.

[0081] Please refer to Figures 1, 2, and 3. In some embodiments of this application, at least one end of the housing 10 is provided with an explosion-proof valve 80, which is located around the electrode terminal 30. It should be noted that the housing 10 is provided with the explosion-proof valve 80 at one end or both opposite ends along its axial direction. Since the explosion-proof valve 80 is located around the electrode terminal 30, regardless of whether a heat exchange tube 40 passes through the middle of the electrode terminal 30, the explosion-proof valve 80 corresponds to the space where the electrode assembly 20 is located. The explosion-proof valve 80 can be used to release internal pressure when the internal pressure (or temperature) of the battery cell 1 reaches a threshold.

[0082] By adopting the above solution, explosion-proof valves 80 can be installed at one end or opposite ends of the housing 10 along its axial direction, located around the electrode terminals 30. Based on this, regardless of whether heat exchange pipes 40 are inserted through the middle of the electrode terminals 30, the explosion-proof valves 80 can be directed to correspond to the space where the electrode assembly 20 is located. This facilitates the release of internal pressure when the internal pressure (or temperature) in the space where the electrode assembly 20 is located reaches a threshold, thereby improving the reliability, safety, and service life of the battery cell 1.

[0083] Of course, in other embodiments, the explosion-proof valve 80 may be located on other walls of the housing 10.

[0084] Please refer to Figures 1, 2, and 3. In some embodiments of this application, at least one end of the housing 10 is provided with a liquid injection hole 90, which is located on the periphery of the electrode terminal 30. It should be noted that the housing 10 has a liquid injection hole 90 at one end or opposite ends along its axial direction. Since the liquid injection hole 90 is located on the periphery of the electrode terminal 30, regardless of whether a heat exchange tube 40 passes through the middle of the electrode terminal 30, the liquid injection hole 90 corresponds to the space where the electrode assembly 20 is located. The liquid injection hole 90 can be used to inject electrolyte into the interior of the battery cell 1.

[0085] By adopting the above scheme, liquid injection holes 90 can be provided at one end or opposite ends of the outer casing 10 along its axial direction, located around the electrode terminals 30. Based on this, regardless of whether a heat exchange tube 40 passes through the middle of the electrode terminals 30, the liquid injection holes 90 can be made to correspond to the space where the electrode assembly 20 is located, thereby facilitating the injection of electrolyte into the space where the electrode assembly 20 is located after the battery cell 1 is basically assembled, thereby maintaining the performance and electrochemical performance of the battery cell 1.

[0086] Of course, in other embodiments, the injection hole 90 may be located on other wall portions of the housing 10.

[0087] Referring to Figures 1, 3, and 4, in some embodiments of this application, the battery cell 1 includes a second insulating film 100. The second insulating film 100 surrounds the inner peripheral wall of the housing 10 and insulatingly isolates the housing 10 from the electrode assembly 20. It should be noted that the second insulating film 100 is a film-like structure with insulating properties. The second insulating film 100 surrounds and is wound around the inner peripheral wall of the housing 10. The second insulating film 100 can cover the area of ​​the inner peripheral wall of the housing 10 corresponding to the electrode assembly 20, thereby insulating and isolating the housing 10 from the electrode assembly 20, and thus electrically insulating the housing 10 from the electrode assembly 20.

[0088] By adopting the above solution, the second insulating film 100, which surrounds or wraps around the inner peripheral wall of the outer casing 10, can insulate and isolate the outer casing 10 from the electrode assembly 20, thereby achieving electrical insulation between the outer casing 10 and the electrode assembly 20. Based on this, the risk of short circuit between the outer casing 10 and the electrode assembly 20 can be reduced, and the reliability, safety, and service life of the battery cell 1 can be improved.

[0089] Please refer to Figures 7 and 8. Some embodiments of this application provide a battery pack, including the battery cell 1 provided in the embodiments of this application. By adopting the above solution, the battery pack can reduce the number of battery cells 1 and connection nodes within the battery pack by using the battery cell 1 provided in the embodiments of this application. This reduces the workload of node connection, improves the assembly efficiency of the battery pack, reduces the risk of poor node connection, ensures that the current and internal resistance of the battery pack meet the requirements, and maintains and improves the overall performance and safety performance of the battery pack.

[0090] Please refer to Figures 7, 8, and 9. Some embodiments of this application provide a battery pack, including multiple battery cells 1 provided in the embodiments of this application, an input pipe 2, an output pipe 3, and at least one U-shaped pipe 4. The input pipe 2 is connected to the heat exchange pipe 40 of one of the battery cells 1, the output pipe 3 is connected to the heat exchange pipe 40 of another battery cell 1, and the U-shaped pipe 4 is connected to the heat exchange pipes 40 of both battery cells 1.

[0091] It should be noted that when the battery pack has multiple battery cells 1, and each battery cell 1 has a heat exchange tube 40, the battery pack can be equipped with an inlet tube 2, an outlet tube 3, and at least one U-shaped tube 4. The inlet tube 2 is connected to one end of the heat exchange tube 40 of one of the battery cells 1, allowing heat exchange fluid to flow through the inlet tube 2 to the heat exchange tube 40 of that battery cell 1. Two heat exchange tubes 40 of the battery cells 1 can be connected via the U-shaped tube 4, allowing heat exchange fluid to flow from the heat exchange tube 40 of one battery cell 1 to the heat exchange tube 40 of the other battery cell 1 via the U-shaped tube 4. The outlet tube 3 is connected to one end of the heat exchange tube 40 of one of the battery cells 1, allowing heat exchange fluid to flow out from the heat exchange tube 40 of that battery cell 1 through the outlet tube 3. Note that the battery cells connected to the outlet tube 3 and the inlet tube 2 are not the same battery cell 1. By integrating an input pipe 2, an output pipe 3, and at least one U-shaped pipe 4, the input pipe 2, the heat exchange pipes 40 of each battery cell 1, the U-shaped pipes 4, and the output pipe 3 can jointly form a transmission channel, which allows for unidirectional flow of the heat exchange fluid. In this embodiment, the heat exchange fluid is mainly a liquid, such as water, a mixture of water and ethylene glycol, etc.

[0092] By adopting the above scheme, when the battery pack has multiple battery cells 1 and each battery cell 1 is equipped with a heat exchange tube 40, the battery pack can connect the heat exchange tubes 40 of two battery cells 1 in series via a U-shaped tube 4, so that the heat exchange tubes 40 of each battery cell 1 together form a series transmission channel. The battery pack can also be connected to the opposite ends of this transmission channel via an input tube 2 and an output tube 3, respectively, so that heat exchange fluid can be input via the input tube 2 and output via the output tube 3. Based on this, the input tube 2, the heat exchange tubes 40 of each battery cell 1, each U-shaped tube 4, and the output tube 3 can be used to form a unidirectional flow transmission channel, which can facilitate the unidirectional flow or even circulation of heat exchange fluid in this transmission channel, thereby improving the heat dissipation performance of the battery pack, improving the thermal management performance of the battery pack for each battery cell 1, and improving the reliability, safety, and service life of the battery pack. Furthermore, based on an input pipe 2, an output pipe 3, and at least one U-shaped pipe 4, the connection convenience and structural simplicity between the heat exchange pipes 40 of each battery cell 1 can also be improved.

[0093] Of course, in other embodiments, the heat exchange tubes 40 of each battery cell 1 may not be connected in series via the inlet tube 2, the U-shaped tube 4, and the outlet tube 3, and each can have its own independent heat exchange fluid. For example, each heat exchange tube 40 of each battery cell 1 can have its own independent heat exchange gas (e.g., air), so that the battery pack can use air cooling to dissipate heat from each battery cell 1.

[0094] As shown in Figure 8, in some embodiments, the battery pack includes a housing 5, and each battery cell 1 is housed within the housing 5, which protects the battery cell 1. In some embodiments, the bottom of the housing 5 is provided with a limiting groove 501, which can limit and accommodate the battery cell 1, thereby limiting and positioning the battery cell 1 relative to the housing 5.

[0095] Please refer to Figures 7 and 8. Some embodiments of this application provide an electrical device, including a battery pack provided in the embodiments of this application. By adopting the above solution, the performance, reliability, and safety of the electrical device can be optimized by applying the battery pack provided in the embodiments of this application.

[0096] The battery cell 1 and battery pack disclosed in this application can be used in electrical devices that use the battery cell 1 and battery pack as power sources, or in various energy storage systems that use the battery cell 1 and battery pack as energy storage elements. Electrical devices can be, but are not limited to, vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered vehicles, natural gas-powered vehicles, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0097] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A single battery cell, comprising: The outer shell is cylindrical. Multiple electrode assemblies are provided, all of which are disposed within the housing. The multiple electrode assemblies are arranged sequentially and connected in series along the axial direction of the housing. The electrode terminals are provided in two form, with opposite polarities. The two electrode terminals are respectively installed at opposite ends of the housing, and are electrically connected to the electrode assembly disposed adjacent to them.

2. The battery cell as described in claim 1, wherein, The electrode terminal has a through hole along its axial direction. The battery cell also includes a heat exchange tube, which passes through the through hole of the two electrode terminals. The electrode assembly is wound around the outer periphery of the heat exchange tube.

3. The battery cell as described in claim 2, wherein, A first sealing element is provided between the wall of the perforation and the outer periphery of the heat exchange tube, and the first sealing element seals the gap between the perforation and the heat exchange tube.

4. The battery cell as described in claim 3, wherein, The perforation includes a first hole segment and a second hole segment arranged sequentially from the outside to the inside, wherein the diameter of the first hole segment is larger than the diameter of the second hole segment; the first sealing element includes a first sealing part and a second sealing part, wherein the first sealing part is disposed in the first hole segment and stops at the bottom of the first hole segment, and the second sealing part is disposed in the second hole segment.

5. The battery cell as described in claim 3, wherein, The wall of the perforation is provided with an annular groove, and a portion of the first sealing element is embedded in the annular groove.

6. The battery cell as described in claim 2, wherein, The battery cell includes a first insulating film that surrounds the outer periphery of the heat exchange tube and insulates the heat exchange tube from the electrode assembly.

7. The battery cell as described in claim 6, wherein, The first insulating film has an annular protrusion, which is disposed between two adjacent electrode assemblies and insulatingly separates the two adjacent electrode assemblies.

8. The battery cell as described in claim 2, wherein, The end of the heat exchange tube protrudes from the outer end face of the electrode terminal.

9. The battery cell according to any one of claims 1-8, wherein, The electrode terminals are sealed to the housing via a second sealing element.

10. The battery cell as described in claim 9, wherein, The electrode terminal includes a main body and a flange, the flange being connected to the outer end of the main body and extending outward along the circumferential direction of the main body; The second seal surrounds the outer periphery of the main body, and the second seal seals against the outer peripheral surface of the main body and seals against the end face of the flange facing thereto.

11. The battery cell as described in claim 9, wherein, The outer casing includes a housing and two end caps. The housing is cylindrical, and the two end caps are respectively installed at the two ends of the housing and are both annular. At at least one end of the housing: an insulating connector is installed inside the ring of the end cap, the insulating connector is arranged in a ring shape, the electrode terminal passes through the ring of the insulating connector, and a portion of the insulating connector is embedded in the second sealing member.

12. The battery cell as described in claim 11, wherein, The insulating connector includes a first ring portion, a second ring portion, and a third ring portion. The electrode terminal passes through the ring of the first ring portion. The second ring portion is connected to the inner end of the first ring portion and extends outward along the circumference of the first ring portion. The third ring portion is connected to the outer ring of the second ring portion and is mounted on the inner end face of the end cap. At least a portion of the second ring portion and the first ring portion are embedded in the second sealing member.

13. The battery cell according to any one of claims 1-8, wherein, At least one end of the housing is provided with an explosion-proof valve, which is located on the periphery of the electrode terminal; And / or, at least one end of the housing is provided with a liquid injection hole, which is located on the periphery of the electrode terminal; And / or, the battery cell includes a second insulating film that surrounds the inner peripheral wall of the housing and insulatingly isolates the housing from the electrode assembly.

14. A battery pack comprising a battery cell as claimed in any one of claims 1-13.

15. A battery pack comprising a plurality of battery cells as claimed in any one of claims 2-8, an input tube, an output tube, and at least one U-shaped tube, the input tube being connected to the heat exchange tube of one of the battery cells, the output tube being connected to the heat exchange tube of another battery cell, and the U-shaped tube being connected to the heat exchange tubes of both battery cells.

16. An electrical device comprising a battery pack as claimed in claim 14 or 15.

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