Battery monomer, battery pack and power utilization device

Abstract

The utility model relates to the field of batteries, and provides a battery monomer, a battery pack and a power utilization device. The battery cell includes a housing, an electrode assembly, and an electrode terminal. Wherein the shell is cylindrical. The multiple electrode assemblies are all arranged in the shell, and the multiple electrode assemblies are sequentially arranged in the axial direction of the shell and are sequentially connected in series. The number of the electrode terminals is two, the polarities of the two electrode terminals are opposite, the two electrode terminals are installed at the two opposite ends of the shell respectively, and the electrode terminals are electrically connected with the adjacent electrode assemblies. Based on the structure, the output voltage of the battery monomers can be increased, so that the number of the battery monomers and the number of connection nodes in the battery pack applying the battery monomers can be reduced, the node connection workload can be reduced, the assembly efficiency of the battery pack can be improved, the risk of poor node connection can be reduced, and the current and internal resistance of the battery pack can meet the requirements; and the overall performance and the safety performance of the battery pack can be maintained and improved.

Description

Technical Field

[0001] This application belongs to the technical field of batteries, and particularly relates to a battery cell, a battery pack, and an electrical device. Background Art

[0002] Currently, the voltages of battery packs for new energy vehicles are commonly 336V, 384V, and 750V. The voltage of a single battery cell is commonly 3V - 4.2V. Based on this, a 336V battery pack needs to be composed of 105 single battery cells connected in series, a 384V battery pack needs to be composed of 120 single battery cells connected in series, and a 750V battery pack needs to be composed of 234 single battery cells connected in series, resulting in numerous connection nodes in the battery pack, leading to a large amount of node connection work in the battery pack and a high risk of poor node connection. Summary of the Utility Model

[0003] Embodiments of this application provide a battery cell, a battery pack, and an electrical device, aiming to solve the problems of numerous connection nodes in the battery pack, resulting in a large amount of node connection work in the battery pack and a high risk of poor node connection.

[0004] To achieve the above object, the technical solution adopted in the embodiments of this application is:

[0005] In a first aspect, a battery cell is provided, including:

[0006] A housing, which is cylindrical;

[0007] An electrode assembly, provided with a plurality of them, and all are arranged inside the housing. The plurality of electrode assemblies are arranged in sequence along the axial direction of the housing and are connected in series in sequence;

[0008] Two electrode terminals, with opposite polarities. The two electrode terminals are respectively installed at opposite ends of the housing, and the electrode terminal is electrically connected to the adjacent electrode assembly.

[0009] In some embodiments, the electrode terminal is axially provided with a perforation, and the battery cell further includes a heat exchange pipe fitting. The heat exchange pipe fitting passes through the perforations of the two electrode terminals, and the electrode assembly is wound around the outer periphery of the heat exchange pipe fitting.

[0010] In some embodiments, a first sealing member is provided between the inner wall of the perforation and the outer periphery of the heat exchange pipe fitting, and the first sealing member seals the gap between the perforation and the heat exchange pipe fitting.

[0011] In some embodiments, the perforation includes a first hole section and a second hole section arranged in sequence from outside to inside, and the aperture of the first hole section is larger than that of the second hole section; the first seal includes a first sealing portion and a second sealing portion, the first sealing portion is arranged in the first hole section and abuts against the bottom of the first hole section, and the second sealing portion is arranged in the second hole section.

[0012] In some embodiments, an annular groove is provided on the hole wall of the perforation, and a part of the first seal is embedded in the annular groove.

[0013] In some embodiments, the battery cell includes a first insulating film, and the first insulating film surrounds the outer periphery of the heat exchange pipe fitting and insulates and isolates the heat exchange pipe fitting from the electrode assembly.

[0014] In some embodiments, the first insulating film is provided with an annular convex portion, and the annular convex portion is arranged between two adjacent electrode assemblies and insulates and separates two adjacent electrode assemblies.

[0015] In some embodiments, the end of the heat exchange pipe fitting protrudes from the outer end surface of the electrode terminal.

[0016] In some embodiments, the electrode terminal and the housing are hermetically connected through a second seal.

[0017] In some embodiments, the electrode terminal includes a main body portion and a flange portion, the flange portion is connected to the outer end of the main body portion and extends outward along the circumferential direction of the main body portion;

[0018] The second seal surrounds the outer periphery of the main body portion, and the second seal seals and abuts against the outer peripheral surface of the main body portion and seals and abuts against the end surface of the flange portion facing it.

[0019] In some embodiments, the housing includes a shell and two end covers, the shell is arranged in a cylindrical shape, and the two end covers are respectively installed at the two end openings of the shell and are both arranged in a ring shape;

[0020] At at least one end of the shell: an insulating connector is installed inside the ring of the end cover, the insulating connector is arranged in a ring shape, the electrode terminal passes through the ring of the insulating connector, and a part of the insulating connector is embedded in the second seal.

[0021] In some embodiments, the insulating connector includes a first ring portion, a second ring portion, and a third ring portion. The electrode terminal passes through the inside 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 stop-mounted on the inner end face of the end cap. At least a part of the second ring portion and the first ring portion are embedded in the second seal.

[0022] In some embodiments, at least one end of the housing is provided with an explosion-proof valve, and the explosion-proof valve is disposed on the circumferential side of the electrode terminal.

[0023] In some embodiments, at least one end of the housing is provided with a liquid injection hole, and the liquid injection hole is disposed on the circumferential side of the electrode terminal.

[0024] In some embodiments, the battery cell includes a second insulating film, and the second insulating film surrounds the inner peripheral wall of the housing and insulates and isolates the housing from the electrode assembly.

[0025] In a second aspect, a battery pack is provided, including the battery cell provided by the embodiments of the present application.

[0026] In a third aspect, a battery pack is provided, including a plurality of battery cells provided by the embodiments of the present application, as well as an input pipe fitting, an output pipe fitting, and at least one U-shaped pipe fitting. The input pipe fitting is connected to the heat exchange pipe fitting of one of the battery cells, the output pipe fitting is connected to the heat exchange pipe fitting of another battery cell, and the U-shaped pipe fitting is connected to the heat exchange pipe fittings of two battery cells.

[0027] In a fourth aspect, an electrical device is provided, including the battery pack provided by the embodiments of the present application.

[0028] The beneficial effects of the battery cell provided by the present application are as follows:

[0029] The battery cell provided by the embodiments of the present application can jointly form a modular, integrated, and structurally optimized battery cell based on the housing, a plurality of electrode assemblies accommodated in the housing and arranged in sequence along the axial direction of the housing, and two electrode terminals respectively installed at both ends of the housing. Moreover, based on the electrical connection relationship between the electrode terminal and the adjacent electrode assembly, and the electrical connection relationship of the sequential series connection of each electrode assembly, the battery cell can realize the input and output of electric energy, thereby maintaining and improving the use performance and electrochemical performance of the battery cell, shortening the current path, reducing the energy loss of the battery cell during charge and discharge, and improving the energy transfer efficiency.

[0030] Moreover, based on the above structure, the output voltage of the battery cell can be equal to the sum of the voltages of each electrode assembly. Based on this, compared with the existing battery cells, the battery cell provided in this embodiment can increase its own output voltage. Thus, for the battery pack applying the battery cell provided in this embodiment, the number of battery cells and the number of connection nodes in the battery pack can be reduced, the node connection workload 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 be made to meet the requirements, and the overall performance and safety performance of the battery pack can be maintained and improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0032] Figure 1 A three-dimensional schematic diagram of a battery cell provided in some embodiments of the present application;

[0033] Figure 2 is Figure 1 A front view of the provided battery cell;

[0034] Figure 3 is Figure 2 A sectional view taken along A-A of the provided one;

[0035] Figure 4 is Figure 3 An enlarged view of region B of the provided one;

[0036] Figure 5 is Figure 3 An enlarged view of region C of the provided one;

[0037] Figure 6 A front view of a battery cell provided in some other embodiments of the present application, wherein the projection shape of the heat exchange flow channel along the axis of the housing is kidney-shaped;

[0038] Figure 7 A three-dimensional schematic diagram of a battery pack provided in some embodiments of the present application;

[0039] Figure 8 is Figure 7 An exploded schematic diagram of the provided battery pack;

[0040] Figure 9 is Figure 8 An enlarged view of region D of the provided one.

[0041] Among them, the reference numerals in the drawings:

[0042] 1 - Battery cell, 2 - Input pipe fitting, 3 - Output pipe fitting, 4 - U-shaped pipe fitting, 5 - Box body, 501 - Limit groove;

[0043] 10 - Outer shell, 11 - Shell, 12 - End cover, 13 - Insulating connector, 131 - First ring part, 132 - Second ring part, 133 - Third ring part; 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 part, 33 - Flange part, 40 - Heat exchange pipe fitting, 41 - Heat exchange flow channel; 50 - First seal, 51 - First seal part, 52 - Second seal part; 60 - First insulating film, 61 - Annular convex part; 70 - Second seal, 80 - Explosion-proof valve, 90 - Liquid injection hole, 100 - Second insulating film. Detailed implementation manners

[0044] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clear and understandable, the present 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 only used to explain the present application and are not used to limit the present application.

[0045] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0046] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0047] In this application, unless otherwise clearly defined or limited, terms such as "installed", "connected", "linked", "fixed", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] In this application, "axial direction" refers to the extending direction of the central axis of the corresponding structure, and "circumferential direction" refers to the surrounding direction of the ring formed by the outer peripheral surface of the corresponding structure.

[0049] In this application, a battery cell is the smallest unit for storing and outputting electric energy. A battery pack is a modular structure including at least two battery cells to provide a higher voltage and capacity.

[0050] Currently, the common voltages of battery packs for new energy vehicles are 336V (volts), 384V, and 750V. And the common voltage of a battery cell is 3V to 4.2V. Based on this, a 336V battery pack needs to be composed of 105 battery cells connected in series, a 384V battery pack needs to be composed of 120 battery cells connected in series, and a 750V battery pack needs to be composed of 234 battery cells connected in series. And connection nodes will be formed between two adjacent battery cells connected in series, resulting in numerous connection nodes in the battery pack, leading to a large amount of node connection work and a high risk of poor node connection. As a result, the assembly efficiency of the battery pack is relatively low, and the battery pack is prone to poor node connection, which affects its safety performance and overall performance such as current and internal resistance. For example, it may cause a reduction in the current of the battery pack, an increase in internal resistance, fire, combustion, explosion, etc.

[0051] Therefore, the embodiments of this application provide a battery cell, which can increase its own output voltage, reduce the number of battery cells and connection nodes in the battery pack using it, thereby reducing the amount of node connection work, improving the assembly efficiency of the battery pack, reducing the risk of poor node connection, enabling the current and internal resistance of the battery pack to meet the requirements, and maintaining and improving the overall performance and safety performance of the battery pack.

[0052] The following describes the specific implementation of this application in detail with specific embodiments:

[0053] Please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4, some embodiments of the present application provide a battery cell 1, including a housing 10, an electrode assembly 20, and electrode terminals 30. Among them, the housing 10 is cylindrical. A plurality of electrode assemblies 20 are provided and are all arranged inside the housing 10. The plurality of electrode assemblies 20 are arranged in sequence along the axial direction of the housing 10 and are connected in series in sequence. Two electrode terminals 30 are provided. The polarities of the two electrode terminals 30 are opposite. The two electrode terminals 30 are respectively installed at opposite ends of the housing 10, and the electrode terminals 30 are electrically connected to the adjacent electrode assemblies 20.

[0054] It should be noted that the housing 10 is a component that mainly isolates the internal environment of the battery cell 1 from the external environment. The housing 10 is a hollow cylinder, such as a cylinder or a prism. The axial direction of the housing 10 is the extension direction of the central axis of the housing 10, and also corresponds to the length direction of the battery cell 1.

[0055] The electrode assembly 20 is a component in the battery cell 1 where an electrochemical reaction occurs. A plurality of electrode assemblies 20 are arranged inside the housing 10. The plurality of electrode assemblies 20 are arranged in sequence along the axial direction of the housing 10. Please refer to Figure 5 together. The electrode assembly 20 includes two sets of electrode plates with opposite polarities and a separator. The two sets of electrode plates with opposite polarities are the positive electrode plate and the negative electrode plate respectively. The separator separates the positive electrode plate and the negative electrode plate. The positive electrode plate, the separator, and the negative electrode plate can be processed by winding to form the electrode assembly 20. In the electrode assembly 20, the part of the positive electrode plate without active material constitutes the positive electrode tab 21, and the part of the negative electrode plate without active material constitutes the negative electrode tab 22. The positive electrode tab 21 and the negative electrode tab 22 are the current transmission ends of the electrode assembly 20 and are used to transmit current. The positive electrode tab 21 and the negative electrode tab 22 are respectively located at both ends of the electrode assembly 20 along the axial direction of the housing 10.

[0056] The electrode terminals 30 (also called pole columns) are components that are electrically connected to the electrode assembly 20 and are used to output or input electrical energy. Two electrode terminals 30 are provided. The polarities of the two electrode terminals 30 are opposite, that is, one of the electrode terminals 30 is the positive electrode terminal 30a, and the other electrode terminal 30 is the negative electrode terminal 30b. The two electrode terminals 30 are respectively installed at opposite ends (along the axial direction of the housing 10) of the housing 10, so that the two electrode terminals 30 are both stably installed in position and state relative to the housing 10.

[0057] The positive electrode tabs 21 of all the electrode assemblies 20 are provided at one end of the electrode assembly 20 facing the positive electrode terminal 30a. The negative electrode tabs 22 of all the electrode assemblies 20 are provided at one 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 the other electrode assembly 20 can face each other, and electrical connection can be established, so that two adjacent electrode assemblies 20 are connected in series. By analogy, each electrode assembly 20 can be connected in series in sequence along the axial direction of the housing 10. Among them, between the negative electrode tab 22 of the electrode assembly 20 and the positive electrode tab 21 of the adjacent electrode assembly 20, electrical connection can be achieved by, but not limited to, welding and other methods.

[0058] The electrode assembly 20 closest to the positive electrode terminal 30a can make its positive electrode tab 21 face the positive electrode terminal 30a, which is convenient for the electrical connection between the positive electrode terminal 30a and the positive electrode tab 21 of the electrode assembly 20 adjacent thereto. The electrode assembly 20 closest to the negative electrode terminal 30b can make its negative electrode tab 22 face the negative electrode terminal 30b, which is convenient for the electrical connection between the negative electrode terminal 30b and the negative electrode tab 22 of the electrode assembly 20 adjacent thereto. Thus, it is convenient for the two electrode terminals 30 to be electrically connected to each electrode assembly 20, which is convenient for the input or output of electric energy. Among them, the electrode terminal 30 and the electrode assembly 20 adjacent thereto can be directly electrically connected, or can be indirectly electrically connected via other components (such as a connecting piece), and the electrical connection method can be achieved by, but not limited to, welding and other methods.

[0059] In summary, the battery cell 1 provided by the embodiment of the present application can jointly form a modular, integrated and structurally optimized battery cell 1 based on the housing 10, a plurality of electrode assemblies 20 accommodated in the housing 10 and arranged in sequence along the axial direction of the housing 10, and two electrode terminals 30 respectively installed at both ends of the housing 10. Moreover, the battery cell 1 can realize the input (i.e., storage) and output of electric energy based on the electrical connection relationship between the electrode terminal 30 and the electrode assembly 20 adjacent thereto, and the electrical connection relationship in which each electrode assembly 20 is connected in series in sequence. Thereby, the use performance and electrochemical performance of the battery cell 1 can be maintained and improved, the current path can be shortened, the energy loss of the battery cell 1 during charge and discharge can be reduced, and the energy transfer efficiency can be improved.

[0060] Moreover, based on the above structure, the output voltage of the battery cell 1 can be equal to the sum of the voltages of the electrode assemblies 20. Based on this, compared with the existing battery cells, the battery cell 1 provided in this embodiment can increase its own output voltage. Thus, for a battery pack applying 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 connection workload of the nodes 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 be made to meet the requirements, and the overall performance and safety performance of the battery pack can be maintained and improved.

[0061] Exemplarily, in a specific application example, 5 electrode assemblies 20 connected in series are provided in the housing 10, and the voltage of each electrode assembly 20 is about 3.2V, and the output voltage of the battery cell 1 can reach 16V. Based on this, for a 336V battery pack, about 21 battery cells 1 provided in this embodiment are applied, for a 384V battery pack, about 24 battery cells 1 provided in this embodiment are applied, and for a 750V battery pack, about 47 battery cells 1 provided in this embodiment are applied. Compared with a battery pack applying hundreds of battery cells in the prior art, the number of battery cells 1 and the number of connection nodes can be significantly reduced, and the risk of the battery pack failing due to poor node connection can be significantly reduced.

[0062] Please refer to Figure 1 、 Figure 3 、 Figure 4 , in some embodiments of the present application, the electrode terminal 30 is provided with a through hole 31 along its axial direction, the battery cell 1 further includes a heat exchange pipe fitting 40, the heat exchange pipe fitting 40 is disposed through the through holes 31 of the two electrode terminals 30, and the electrode assembly 20 is wound around the outer periphery of the heat exchange pipe fitting 40.

[0063] It should be noted that the electrode terminal 30 is provided with a through hole 31, and the through hole 31 penetrates the electrode terminal 30 along the axial direction of the electrode terminal 30. The axial direction of the electrode terminal 30 is the extending direction of the central axis of the electrode terminal 30, and also corresponds to the axial direction of the housing 10.

[0064] The heat exchange pipe fitting 40 is of a tubular structure, and the heat exchange pipe fitting 40 is inserted through the perforations 31 of the two electrode terminals 30. The electrode assembly 20 is wound around the outer periphery of the heat exchange pipe fitting 40. Based on this, the heat exchange pipe fitting 40 is both inserted through the middle of each electrode assembly 20 and inserted through the middle of the two electrode terminals 30, so that the inner space of the heat exchange pipe fitting 40 can form a heat exchange flow channel 41 that penetrates the battery cell 1 along the axial direction of the housing 10. The heat exchange flow channel 41 can be used for flowing heat exchange fluid. Thus, the heat exchange pipe fitting 40 can be thermally connected to the electrode assembly 20, so as to facilitate the heat exchange between the heat exchange fluid in the heat exchange pipe fitting 40 and the electrode assembly 20, especially to facilitate the heat dissipation of the electrode assembly 20 by the heat exchange fluid in the heat exchange pipe fitting 40. Moreover, the heat exchange pipe fitting 40 can be thermally connected to the electrode terminal 30, so as to facilitate the heat exchange between the heat exchange fluid in the heat exchange pipe fitting 40 and the electrode terminal 30, especially to facilitate the heat dissipation of the electrode terminal 30 by the heat exchange fluid in the heat exchange pipe fitting 40.

[0065] Wherein, the heat exchange fluid can be a liquid or a gas, and the heat exchange fluid can be but is not limited to water, a mixture of water and ethylene glycol, or air, etc.

[0066] Wherein, along the axial direction of the housing 10, the projected shape of the heat exchange flow channel 41 can be but is not limited to circular (as shown in Figure 2 ), kidney-shaped (as shown in Figure 6 ), rectangular, etc. The projected shape of the heat exchange pipe fitting 40 can be but is not limited to circular (as shown in Figure 2 ), kidney-shaped (as shown in Figure 6 ), rectangular, etc. The projected shape of the battery cell 1 can be but is not limited to circular (as shown in Figure 2 ), kidney-shaped (as shown in Figure 6 ), rectangular, etc. The projected shape of the heat exchange pipe fitting 40 and the projected shape of the heat exchange flow channel 41 can be set to be the same or different, and the projected shape of the heat exchange flow channel 41 and the projected shape of the battery cell 1 can be set to be the same or different.

[0067] By adopting the above solution, the battery cell 1 can pass through the heat exchange pipe fitting 40, which is arranged through the middle parts of the electrode assemblies 20 and also through the through holes 31 of the two electrode terminals 30. Based on this, it is convenient to form a heat exchange flow path 41 that penetrates the battery cell 1 along the axial direction of the housing 10 through the inner space of the heat exchange pipe fitting 40, and it is convenient to flow the heat exchange fluid through the heat exchange flow path 41, so as to facilitate the heat exchange between the heat exchange fluid in the heat exchange pipe fitting 40 and the electrode assemblies 20 and the electrode terminals 30, especially to dissipate heat from the heat exchange fluid in the heat exchange pipe fitting 40 to the electrode assemblies 20 and the electrode terminals 30. Moreover, the heat exchange fluid in the heat exchange pipe fitting 40 can directly and quickly adjust the heat in the middle parts of the electrode assemblies 20 and the electrode terminals 30, and can diffusely adjust the heat at the edges of the electrode assemblies 20 and the electrode terminals 30 circumferentially along the heat exchange pipe fitting 40 to achieve balanced adjustment, so as to reduce the phenomenon of uneven heat distribution between the middle and the edges of the electrode assemblies 20 and the electrode terminals 30, balance the heat distribution inside the battery cell 1, and reduce local overheating. Thus, the risk of thermal runaway of the battery cell 1 can be reduced, and the performance stability, usage reliability, usage safety and service life of the battery cell 1 can be improved.

[0068] Moreover, the heat exchange pipe fitting 40 can also cooperate with the housing 10 to provide support for the electrode assemblies 20, the electrode terminals 30, etc., so as to optimize the structure of the battery cell 1, enhance the mechanical strength and anti-vibration ability of the battery cell 1, and contribute to maintaining the stable operation of the battery under complex working conditions.

[0069] Please refer to Figure 1 , Figure 3 , Figure 4 , in some embodiments of the present application, a first seal 50 is provided between the hole wall of the through hole 31 and the outer periphery of the heat exchange pipe fitting 40, and the first seal 50 seals the gap between the through hole 31 and the heat exchange pipe fitting 40.

[0070] It should be noted that the first seal 50 is a component with sealing performance. The first seal 50 is arranged in a ring shape and is sleeved between the hole wall of the through hole 31 and the outer periphery of the heat exchange pipe fitting 40. The first seal 50 seals the gap between the hole wall of the through hole 31 and the outer periphery of the heat exchange pipe fitting 40. Corresponding to the through holes 31 of the two electrode terminals 30, two first seals 50 are also correspondingly arranged.

[0071] By adopting the above solution, the gap between the hole wall of the through hole 31 and the outer periphery of the heat exchange pipe fitting 40 can be sealed by the first seal 50, so as to improve the sealing performance between the hole wall of the through hole 31 and the outer periphery of the heat exchange pipe fitting 40. Based on this, it is possible to prevent the liquid (such as electrolyte) in the battery cell 1 from leaking out through the gap between the through hole 31 and the heat exchange pipe fitting 40, prevent the gas generated during the charging and discharging process of the battery cell 1 from overflowing through the gap between the through hole 31 and the heat exchange pipe fitting 40, and prevent external impurities such as dust and moisture from invading the interior of the battery cell 1 through the gap between the through hole 31 and the heat exchange pipe fitting 40. Thus, the risk that the performance of the battery cell 1 is reduced and potential safety hazards occur due to liquid leakage, gas overflow, and impurity contamination can be reduced, the stability of the internal environment of the battery cell 1 can be maintained, and the reliability, safety, and service life of the battery cell 1 can be improved.

[0072] In some embodiments, the first seal 50 is an insulating sealant. With this arrangement, the first seal 50 can be made to have insulating properties, enabling electrical insulation between the hole wall of the through hole 31 and the outer periphery of the heat exchange pipe fitting 40 via the first seal 50. Of course, in other embodiments, electrical insulation between the hole wall of the through hole 31 and the outer periphery of the heat exchange pipe fitting 40 can be achieved via other components (such as an insulating film).

[0073] Of course, in other embodiments, other methods can be used to seal the through hole 31 and the heat exchange pipe fitting 40, such as applying a sealant to the outer hole edge of the through hole 31.

[0074] Please refer to Figure 1 、 Figure 3 、 Figure 4 , in some embodiments of the present application, the through hole 31 includes a first hole section 311 and a second hole section 312 arranged in sequence from outside to inside, and the aperture of the first hole section 311 is larger than that of the second hole section 312. The first seal 50 includes a first sealing portion 51 and a second sealing portion 52. The first sealing portion 51 is disposed in the first hole section 311 and abuts against the bottom of the first hole section 311, and the second sealing portion 52 is disposed in the second hole section 312.

[0075] It should be noted that the through hole 31 is divided into a first hole section 311 and a second hole section 312. The first hole section 311 is disposed on the outer side of the second hole section 312, and the first hole section 311 and the second hole section 312 are in communication. The aperture of the first hole section 311 is larger than that of the second hole section 312, that is, along the through direction of the through hole 31, the projection of the second hole section 312 falls within the projection of the first hole section 311.

[0076] Correspondingly, the first seal 50 sleeved in the through hole 31 includes a first sealing portion 51 and a second sealing portion 52. The first sealing portion 51 is adaptively sleeved between the hole wall of the first hole section 311 and the outer periphery of the heat exchange pipe fitting 40, and seals the gap between the hole wall of the first hole section 311 and the outer periphery of the heat exchange pipe fitting 40. The second sealing portion 52 is adaptively sleeved between the hole wall of the second hole section 312 and the outer periphery of the heat exchange pipe fitting 40, and seals the gap between the hole wall of the second hole section 312 and the outer periphery of the heat exchange pipe fitting 40. Since the aperture of the first hole section 311 is larger than that of the second hole section 312, the first sealing portion 51 will stop at the bottom of the first hole section 311 close to 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, so as to stabilize the position and state of the first seal 50 relative to the through hole 31.

[0077] By adopting the above scheme, the first sealing portion 51 can be sleeved between the hole wall of the first hole section 311 and the outer periphery of the heat exchange pipe fitting 40 and stop at the bottom of the first hole section 311 close to the second hole section 312, so as to form a first sealing barrier between the hole wall of the first hole section 311 and the outer periphery of the heat exchange pipe fitting 40. The second sealing portion 52 can also be adaptively sleeved between the hole wall of the second hole section 312 and the outer periphery of the heat exchange pipe fitting 40, so as to form a second sealing barrier between the hole wall of the second hole section 312 and the outer periphery of the heat exchange pipe fitting 40. Based on this, the position and state of the first seal 50 relative to the through hole 31 can be stabilized, the risk of loosening or displacement of the first seal 50 relative to the through hole 31 can be reduced, and multiple guarantees can be formed based on the segmented sealing design, so as to improve the sealing reliability of the first seal 50 between the through hole 31 and the heat exchange pipe fitting 40 and reduce the risk of sealing failure of the first seal 50.

[0078] Of course, in other embodiments, the through hole 31 may not be designed with hole sections, or may be divided into at least three hole sections. The first seal 50 can be designed corresponding to the through hole 31.

[0079] Please refer to Figure 1 、 Figure 3 、 Figure 4 , in some embodiments of the present application, an annular groove 313 is provided on the hole wall of the through hole 31, and a part of the first seal 50 is embedded in the annular groove 313.

[0080] It should be noted that at least one annular groove 313 is provided on the hole wall of the through hole 31. In the case where there are multiple annular grooves 313, the multiple annular grooves 313 can be spaced along the axial direction of the through hole 31. The annular groove 313 extends along the circumferential direction of the through hole 31. The annular groove 313 can be in a closed ring shape or an open ring shape. The part of the first seal 50 corresponding to the annular groove 313 is embedded in the annular groove 313.

[0081] By adopting the above solution, a part of the first seal 50 can be embedded in the annular groove 313 to increase the contact area between the first seal 50 and the wall of the through hole 31. Based on this, the tightness, durability, reliability and stability of the sealed connection between the first seal 50 and the through hole 31 can be improved, the position and state of the first seal 50 relative to the through hole 31 can be stabilized, the risk that the first seal 50 detaches from the wall of the through hole 31 under external pressure or vibration can be reduced, and a tolerance can be provided for the first seal 50 through the part of the first seal 50 embedded in the annular groove 313, so as to enable the first seal 50 to still maintain a good sealing effect when affected by factors such as temperature change and material aging. Thus, the sealing reliability of the first seal 50 between the through hole 31 and the heat exchange pipe fitting 40 can be improved, and the risk of sealing failure of the first seal 50 can be reduced.

[0082] This embodiment is suitable for combined application with the previous embodiment to comprehensively improve the sealing reliability of the first seal 50 between the through hole 31 and the heat exchange pipe fitting 40. As Figure 4 shown, in some embodiments, an annular groove 313 is provided on the wall of the second hole section 312 of the through hole 31.

[0083] Please refer to Figure 1 、 Figure 3 、 Figure 4 、 Figure 5 , in some embodiments of the present application, the battery cell 1 includes a first insulating film 60, and the first insulating film 60 surrounds the outer periphery of the heat exchange pipe fitting 40 and insulates and isolates the heat exchange pipe fitting 40 from the electrode assembly 20.

[0084] 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 winds around the outer periphery of the heat exchange pipe fitting 40. The first insulating film 60 can cover the area of the outer peripheral surface of the heat exchange pipe fitting 40 corresponding to the electrode assembly 20 to insulate and isolate the heat exchange pipe fitting 40 from the electrode assembly 20, so as to electrically insulate the heat exchange pipe fitting 40 from the electrode assembly 20.

[0085] By adopting the above solution, the heat exchange pipe fitting 40 and the electrode assembly 20 can be electrically insulated by the first insulating film 60 wound around the outer periphery of the heat exchange pipe fitting 40, so as to electrically insulate the heat exchange pipe fitting 40 from the electrode assembly 20. Based on this, the risk of short circuit between the heat exchange pipe fitting 40 and the electrode assembly 20 can be reduced, and the use reliability, use safety and service life of the battery cell 1 can be improved.

[0086] In some embodiments, the first insulating film 60 may further cover the area of the outer peripheral surface of the heat exchange pipe fitting 40 corresponding to the electrode terminal 30, and may even cover all areas of the outer peripheral surface of the heat exchange pipe fitting 40. Based on this, the first insulating film 60 can not only insulate and isolate the heat exchange pipe fitting 40 from the electrode assembly 20, but also insulate and isolate the heat exchange pipe fitting 40 from the electrode terminal 30, thereby promoting electrical insulation between the heat exchange pipe fitting 40 and the electrode assembly 20 and the electrode terminal 30 respectively, reducing the short-circuit risk between the heat exchange pipe fitting 40 and the electrode assembly 20 and between the heat exchange pipe fitting 40 and the electrode terminal 30, and improving the use reliability, use safety and service life of the battery cell 1.

[0087] Of course, in other embodiments, when electrical insulation is achieved between the heat exchange pipe fitting 40 and the electrode terminal 30 through other components (such as insulating sealant), the first insulating film 60 may not necessarily cover the area of the outer peripheral surface of the heat exchange pipe fitting 40 corresponding to the electrode terminal 30.

[0088] Please refer to Figure 1 、 Figure 3 、 Figure 5 In some embodiments of the present application, the first insulating film 60 is provided with an annular protrusion 61, and the annular protrusion 61 is disposed between two adjacent electrode assemblies 20 and insulates and separates the two adjacent electrode assemblies 20.

[0089] It should be noted that the first insulating film 60 can increase its winding thickness between two adjacent electrode assemblies 20 to form the annular protrusion 61. The annular protrusion 61 can be disposed between two adjacent electrode assemblies 20 and insulate and separate the two adjacent electrode assemblies 20.

[0090] By adopting the above solution, an insulating barrier can be formed between two adjacent electrode assemblies 20 through the annular protrusion 61 disposed between two adjacent electrode assemblies 20 to insulate and separate the two adjacent electrode assemblies 20. Based on this, the risk of short circuit due to direct contact between two adjacent electrode assemblies 20 can be reduced, and the use reliability, use safety and service life of the battery cell 1 can be improved. Moreover, the setting of the annular protrusion 61 can also play a role in limiting and positioning two adjacent electrode assemblies 20 to a certain extent, thereby stabilizing the positions of multiple electrode assemblies 20 on the outer periphery of the heat exchange pipe fitting 40 and improving the structural reliability and structural stability of the battery cell 1.

[0091] Of course, in other embodiments, a protrusion may be provided between two adjacent electrode assemblies 20 on the outer periphery of the heat exchange pipe fitting 40, and the part of the first insulating film 60 wound around the protrusion can also play the role of "insulating and separating two adjacent electrode assemblies 20".

[0092] Please refer to Figure 1 、 Figure 3, in some embodiments of the present application, the end of the heat exchange pipe fitting 40 protrudes from 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.

[0093] By adopting the above solution, by making the end of the heat exchange pipe fitting 40 protrude from the outer end face of the electrode terminal 30, it is convenient for the heat exchange pipe fitting 40 to be connected and communicated with other heat management channels of the battery pack (such as Figure 7 , Figure 8 , Figure 9 the input pipe fitting 2, the output pipe fitting 3 or the U-shaped pipe fitting 4 shown) through the part protruding from the outer end face of the electrode terminal 30, thereby improving the connection convenience between the heat exchange pipe fitting 40 of the battery cell 1 and other components of the battery pack, promoting the flow and distribution of the heat exchange fluid in the battery pack, and improving the assembly convenience and heat dissipation performance of the battery pack applying the battery cell 1.

[0094] Of course, in other embodiments, the end of the heat exchange pipe fitting 40 may be flush with the outer end face of the electrode terminal 30.

[0095] Please refer to Figure 1 , Figure 3 , Figure 4 , in some embodiments of the present application, the electrode terminal 30 and the housing 10 are hermetically connected through a second seal 70.

[0096] It should be noted that the second seal 70 is a component with sealing performance. The second seal 70 is arranged in a ring shape and is sleeved between the outer periphery of the electrode terminal 30 and the housing 10. The second seal 70 seals the gap between the outer periphery of the electrode terminal 30 and the housing 10. Corresponding to the two electrode terminals 30, two second seals 70 are also correspondingly arranged.

[0097] By adopting the above solution, the gap between the outer periphery of the electrode terminal 30 and the housing 10 can be sealed through the second seal 70 to improve the sealing performance between the outer periphery of the electrode terminal 30 and the housing 10. Based on this, it can prevent the liquid (such as electrolyte) in the battery cell 1 from leaking out through the gap between the outer periphery of the electrode terminal 30 and the housing 10, prevent the 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 housing 10, and prevent external dust, moisture and other impurities from invading the interior of the battery cell 1 through the gap between the outer periphery of the electrode terminal 30 and the housing 10. Thus, the risk of the battery cell 1 reducing performance and having safety hazards due to liquid leakage, gas overflow and impurity pollution can be reduced, the stability of the internal environment of the battery cell 1 can be maintained, and the use reliability, use safety and service life of the battery cell 1 can be improved.

[0098] In some embodiments, the second seal 70 is an insulating sealant. With such an arrangement, the second seal 70 can be made to have insulating properties, enabling 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 can be achieved via other components (such as the insulating connector 13).

[0099] Please refer to Figure 1 、 Figure 3 、 Figure 4 , in some embodiments of the present application, the electrode terminal 30 includes a main body portion 32 and a flange portion 33. The flange portion 33 is connected to the outer end of the main body portion 32 and extends outward along the circumferential direction of the main body portion 32. The second seal 70 surrounds the outer periphery of the main body portion 32. The second seal 70 seals and abuts against the outer peripheral surface of the main body portion 32 and seals and abuts against the end surface of the flange portion 33 facing it.

[0100] It should be noted that the main body portion 32 of the electrode terminal 30 is inserted and installed in the housing 10 and is electrically connected to the adjacent electrode assembly 20. The flange portion 33 of the electrode terminal 30 is connected to the outer end of the main body portion 32 near the outside of the battery cell 1. The flange portion 33 is formed by extending outward along the circumferential direction of the main body portion 32 relative to the main body portion 32, such that a stepped structure is formed between the flange portion 33 and the main body portion 32.

[0101] The second seal 70 is arranged in a ring shape and is sleeved between the outer periphery of the main body portion 32 and the housing 10. The inner ring surface of the second seal 70 seals and abuts against the outer peripheral surface of the main body portion 32. The side surface of the second seal 70 facing the flange portion 33 seals and abuts against the side surface of the flange portion 33 facing the second seal 70.

[0102] By adopting the above scheme, the inner ring surface of the second seal 70 can be made to seal and abut against the outer peripheral surface of the main body portion 32, and the side surfaces of the second seal 70 and the flange portion 33 facing each other can be made to seal and abut against each other. Based on this, two sealing surfaces can be formed between the second seal 70 and the electrode terminal 30, the sealing area between the second seal 70 and the electrode terminal 30 can be increased, the tightness, durability, reliability, and stability of the sealed connection between the second seal 70 and the electrode terminal 30 can be improved, the risk of the second seal 70 loosening or displacing relative to the electrode terminal 30 can be reduced, thereby the sealing reliability of the second seal 70 between the electrode terminal 30 and the housing 10 can be improved, and the risk of the second seal 70 sealing failure can be reduced.

[0103] 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. For another example, the electrode terminal 30 may be provided with more parts to form more stepped structures. For yet another example, a groove for installing the second seal 70 may be formed on the outer peripheral surface of the electrode terminal 30.

[0104] Please refer to Figure 1 、 Figure 3 、 Figure 4 , in some embodiments of the present application, the housing 10 includes a housing body 11 and two end caps 12. The housing body 11 is arranged in a cylindrical shape, and the two end caps 12 are respectively installed at the two end openings of the housing body 11 and are both arranged in a ring shape. At at least one end of the housing body 11: an insulating connector 13 is installed inside the ring of the end cap 12. The insulating connector 13 is arranged in a ring shape, and the electrode terminal 30 passes through the ring of the insulating connector 13. A part of the insulating connector 13 is embedded in the second seal 70.

[0105] It should be noted that the housing body 11 is in a cylindrical shape, such as a cylindrical shape or a polygonal cylindrical shape. The inner space of the housing body 11 can be used to accommodate components such as the electrode assembly 20. There are two end caps 12, and the two end caps 12 are respectively installed at the two end openings of the housing body 11. The end cap 12 is arranged in a ring shape, and the outer ring edge of the end cap 12 is hermetically connected to the edge of the end opening of the housing body 11.

[0106] At one end or opposite ends of the housing body 11 along its axial direction: a ring-shaped insulating connector 13 may be added inside 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 hermetically connected to the end cap 12, and the inner space of the insulating connector 13 is used for the electrode 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. Moreover, the electrode terminal 30 can be electrically insulated from the housing 10 based on the insulation of the insulating connector 13, thereby reducing the short-circuit risk between the electrode terminal 30 and the housing 10. On this basis, a part of the insulating connector 13 can also be embedded in the second seal 70 on the outer periphery of the electrode terminal 30 to improve the tightness of the hermetic connection between the housing 10 and the second seal 70.

[0107] Among them, in some embodiments, an insulating layer is provided on the outer surface of the insulating connector 13 so that the outer surface of the insulating connector 13 has insulating properties. In other embodiments, the insulating connector 13 is integrally made of an insulating material so that the insulating connector 13 as a whole has insulating properties.

[0108] By adopting the above solution, a cylindrical outer shell 10 can be basically formed based on the cylindrical housing 11 and the two annular end caps 12. On this basis, at one end or opposite ends of the housing 11 along its axial direction: an inner-ring space through which the electrode terminal 30 can pass is formed via the annular insulating connecting member 13 installed inside the ring of the end cap 12, so that the electrode terminal 30 can be installed in the outer shell 10 through being inserted into the ring of the insulating connecting member 13. Moreover, since at least the outer surface of the insulating connecting member 13 has insulating properties, the electrode terminal 30 can be made electrically insulated from the insulating connecting member 13, thereby the electrode terminal 30 can be made electrically insulated from the outer shell 10, the short-circuit risk between the electrode terminal 30 and the outer shell 10 can be reduced, and the use reliability, use safety and service life of the battery cell 1 can be improved.

[0109] On this basis, by embedding a part of the insulating connecting member 13 into the second sealing member 70 on the outer periphery of the electrode terminal 30, the connection tightness and connection strength between the insulating connecting member 13 and the second sealing member 70 can be enhanced. Based on this, the tightness, durability, reliability and stability of the sealed connection between the second sealing member 70 and the outer shell 10 can be improved, thereby the sealing reliability of the second sealing member 70 between the electrode terminal 30 and the outer shell 10 can be improved, and the risk of sealing failure of the second sealing member 70 can be reduced.

[0110] Of course, in other embodiments, at one end or opposite ends of the housing 11 along its axial direction: the insulating connecting member 13 can be omitted, the electrode terminal 30 can be directly inserted into the ring of the end cap 12, and a part of the end cap 12 can be embedded into the second sealing member 70.

[0111] Please refer to Figure 1 、 Figure 3 、 Figure 4 , in some embodiments of the present application, the insulating connecting member 13 includes a first ring portion 131, a second ring portion 132 and a third ring portion 133. The electrode terminal 30 is inserted into 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 stop-mounted on the inner end face of the end cap 12. At least a part of the second ring portion 132 and the first ring portion 131 are embedded into the second sealing member 70.

[0112] It should be noted that the electrode terminal 30 passes through the inside of the ring of the first ring portion 131, that is, the first ring portion 131 is disposed 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 close to the inside of the battery cell 1. The second ring portion 132 is formed by extending outward along the circumferential direction of the first ring portion 131 relative to the first ring portion 131, so that the second ring portion 132 intersects (for example, is 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 abuts against, contacts, and is fixedly installed on the inner end surface of the end cover 12 close to the inside of the battery cell 1. The third ring portion 133 and the inner end surface of the end cover 12 can be fixedly connected by, but not limited to, welding.

[0113] 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 seal 70.

[0114] By adopting the above solution, the insulating connector 13 can be stopped against, abutted against, and fixedly installed on the inner end surface of the end cover 12 close to the inside of the battery cell 1 via the third ring portion 133, so that its overall 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 enclose a ring-shaped space through which the electrode terminal 30 can pass via the first ring portion 131, so as to facilitate the electrode terminal 30 to pass through the inside of the ring of the insulating connector 13. Based on this, the structure of the insulating connector 13 can be optimized, and the cooperation convenience between the insulating connector 13 and the end cover 12 and the electrode terminal 30 can be improved.

[0115] On this basis, by embedding at least part of the second ring portion 132 and the first ring portion 131 into the second seal 70, it is possible to embed the first ring portion 131, the corner of the first ring portion 131 and the second ring portion 132, and even all of the second ring portion 132 into the second seal 70. Based on this, the connection area between the insulating connector 13 and the second seal 70 can be increased, the connection tightness and connection strength between the insulating connector 13 and the second seal 70 can be enhanced, and the risk of loosening or displacement of the insulating connector 13 relative to the second seal 70 can be reduced. Thus, the tightness, durability, reliability, and stability of the sealed connection between the second seal 70 and the insulating connector 13 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.

[0116] Of course, in other embodiments, the insulating connector 13 can adopt other structural designs. For example, the insulating connector 13 can omit one of the first ring portion 131 and the second ring portion 132.

[0117] Please refer toFigure 1 , Figure 2 , Figure 3 , in some embodiments of the present application, an explosion-proof valve 80 is provided at at least one end of the outer shell 10, and the explosion-proof valve 80 is arranged on the circumferential side of the electrode terminal 30.

[0118] It should be noted that the explosion-proof valve 80 is provided at one end or opposite ends of the outer shell 10 along its axial direction. The explosion-proof valve 80 is arranged on the circumferential side of the electrode terminal 30. Based on this, regardless of whether the heat exchange pipe fitting 40 penetrates 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 the internal pressure when the internal pressure (or temperature) of the battery cell 1 reaches a threshold value.

[0119] By adopting the above scheme, the explosion-proof valve 80 located on the circumferential side of the electrode terminal 30 can be provided at one end or opposite ends of the outer shell 10 along its axial direction. Based on this, regardless of whether the heat exchange pipe fitting 40 penetrates through the middle of the electrode terminal 30, the explosion-proof valve 80 can be made to correspond to the space where the electrode assembly 20 is located, so as to facilitate releasing the internal pressure through the explosion-proof valve 80 when the internal pressure (or temperature) of the space where the electrode assembly 20 is located reaches a threshold value, thereby improving the use reliability, use safety and service life of the battery cell 1.

[0120] Of course, in other embodiments, the explosion-proof valve 80 can be arranged on other wall parts of the outer shell 10.

[0121] Please refer to Figure 1 , Figure 2 , Figure 3 , in some embodiments of the present application, a liquid injection hole 90 is provided at at least one end of the outer shell 10, and the liquid injection hole 90 is arranged on the circumferential side of the electrode terminal 30.

[0122] It should be noted that the liquid injection hole 90 is provided at one end or opposite ends of the outer shell 10 along its axial direction. The liquid injection hole 90 is arranged on the circumferential side of the electrode terminal 30. Based on this, regardless of whether the heat exchange pipe fitting 40 penetrates 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.

[0123] By adopting the above scheme, the liquid injection hole 90 located on the circumferential side of the electrode terminal 30 can be provided at one end or opposite ends of the outer shell 10 along its axial direction. Based on this, regardless of whether the heat exchange pipe fitting 40 penetrates through the middle of the electrode terminal 30, the liquid injection hole 90 can be made to correspond to the space where the electrode assembly 20 is located, so as to facilitate injecting electrolyte into the space where the electrode assembly 20 is located when the battery cell 1 is basically assembled, thereby maintaining the use performance and electrochemical performance of the battery cell 1.

[0124] Of course, in other embodiments, the liquid injection hole 90 can be arranged on other wall parts of the outer shell 10.

[0125] Please refer to Figure 1 、 Figure 3 、 Figure 4 In some embodiments of the present application, the battery cell 1 includes a second insulating film 100, and the second insulating film 100 surrounds the inner peripheral wall of the housing 10 and insulates and isolates the housing 10 from the electrode assembly 20.

[0126] 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 winds 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 to insulate and isolate the housing 10 from the electrode assembly 20, so as to electrically insulate the housing 10 from the electrode assembly 20.

[0127] By adopting the above solution, the housing 10 and the electrode assembly 20 can be electrically insulated from each other through the second insulating film 100 that surrounds and winds around the inner peripheral wall of the housing 10. Based on this, the short-circuit risk between the housing 10 and the electrode assembly 20 can be reduced, and the use reliability, use safety and service life of the battery cell 1 can be improved.

[0128] Please refer to Figure 7 、 Figure 8 Some embodiments of the present application provide a battery pack, including the battery cell 1 provided by the embodiments of the present application.

[0129] By adopting the above solution, the battery pack can reduce the number of battery cells 1 and the number of connection nodes in the battery pack by applying the battery cell 1 provided by the embodiments of the present application, thereby reducing the node connection workload, improving the assembly efficiency of the battery pack, reducing the risk of poor node connection, making 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.

[0130] Please refer to Figure 7 、 Figure 8 、 Figure 9 Some embodiments of the present application provide a battery pack, including a plurality of battery cells 1 provided by the embodiments of the present application, an input pipe fitting 2, an output pipe fitting 3 and at least one U-shaped pipe fitting 4. The input pipe fitting 2 is connected to the heat exchange pipe fitting 40 of one of the battery cells 1, the output pipe fitting 3 is connected to the heat exchange pipe fitting 40 of another battery cell 1, and the U-shaped pipe fitting 4 is connected to the heat exchange pipe fittings 40 of two battery cells 1.

[0131] It should be noted that in the case where the battery pack is provided with a plurality of battery cells 1 and the battery cells 1 are provided with heat exchange pipe fittings 40, the battery pack can be provided with an input pipe fitting 2, an output pipe fitting 3 and at least one U-shaped pipe fitting 4.

[0132] The input pipe fitting 2 is connected to one end of the heat exchange pipe fitting 40 of one of the battery cells 1, so that the heat exchange fluid can flow through the input pipe fitting 2 to the heat exchange pipe fitting 40 of this battery cell 1.

[0133] The heat exchange pipe fittings 40 of two battery cells 1 can be connected via a U-shaped pipe fitting 4, so that the heat exchange fluid can flow from the heat exchange pipe fitting 40 of one battery cell 1 to the heat exchange pipe fitting 40 of another battery cell 1 via the U-shaped pipe fitting 4.

[0134] The output pipe fitting 3 is connected to one end of the heat exchange pipe fitting 40 of one of the battery cells 1, so that the heat exchange fluid can flow out from the heat exchange pipe fitting 40 of this battery cell 1 via the output pipe fitting 3. Among them, the battery cell 1 to which the output pipe fitting 3 and the input pipe fitting 2 are connected is not the same battery cell 1.

[0135] Combining one input pipe fitting 2, one output pipe fitting 3 and at least one U-shaped pipe fitting 4, the input pipe fitting 2, the heat exchange pipe fittings 40 of each battery cell 1, each U-shaped pipe fitting 4, and the output pipe fitting 3 can jointly form a transmission channel, and this transmission channel can supply the heat exchange fluid to flow unidirectionally. In this embodiment, the heat exchange fluid is mainly a liquid, such as water, a mixture of water and ethylene glycol, and so on.

[0136] By adopting the above scheme, in the case where the battery pack is provided with a plurality of battery cells 1 and the battery cells 1 are provided with heat exchange pipe fittings 40, the battery pack can connect the heat exchange pipe fittings 40 of two battery cells 1 in series via the U-shaped pipe fitting 4, so that the heat exchange pipe fittings 40 of each battery cell 1 jointly form a series-connected transmission channel; the battery pack can also be connected to the opposite ends of this transmission channel via the input pipe fitting 2 and the output pipe fitting 3 respectively, so as to facilitate the input of the heat exchange fluid via the input pipe fitting 2 and facilitate the output of the heat exchange fluid via the output pipe fitting 3. Based on this, it can be promoted that the input pipe fitting 2, the heat exchange pipe fittings 40 of each battery cell 1, each U-shaped pipe fitting 4, and the output pipe fitting 3 jointly form a transmission channel for unidirectional flow, which can facilitate the unidirectional flow of the heat exchange fluid in this transmission channel, and even circulating flow, 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 use reliability, use safety and service life of the battery pack. And, based on one input pipe fitting 2, one output pipe fitting 3 and at least one U-shaped pipe fitting 4, the connection convenience and structural simplicity between the heat exchange pipe fittings 40 of each battery cell 1 can also be improved.

[0137] Of course, in other embodiments, the heat exchange pipe fittings 40 of each battery cell 1 may not form a series connection relationship via the input pipe fitting 2, the U-shaped pipe fitting 4, and the output pipe fitting 3, and the heat exchange fluid can flow independently. For example, the heat exchange pipe fittings 40 of each battery cell 1 can independently flow heat exchange gas (such as air), so that the battery pack can use the air-cooled form to dissipate heat from each battery cell 1.

[0138] Such asFigure 8 As shown, in some embodiments, the battery pack further includes a box body 5, and each battery cell 1 is accommodated in the box body 5, and the box body 5 can protect the battery cell 1. In some embodiments, a limiting groove 501 is provided at the bottom of the box body 5, and the limiting groove 501 can limit and accommodate the battery cell 1 to urge the battery cell 1 to be limited and positioned relative to the box body 5.

[0139] Please refer to Figure 7 、 Figure 8 , some embodiments of the present application provide an electrical device, including the battery pack provided by the embodiments of the present application.

[0140] By adopting the above solution, the electrical device can optimize the performance, use reliability and use safety of the electrical device by applying the battery pack provided by the embodiments of the present application.

[0141] The battery cell 1 and the battery pack disclosed in the embodiments of the present application can be used in electrical devices that use the battery cell 1 and the battery pack as a power source, or in various energy storage systems that use the battery cell 1 and the battery pack as energy storage elements. The electrical device can be, but is not limited to, vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and power tools, etc. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. The spacecraft includes airplanes, rockets, space shuttles, and spaceships, etc. The electric toy includes stationary or mobile electric toys, for example, game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, etc. The power tool includes metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact electric drills, concrete vibrators, and electric planers, etc.

[0142] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, or improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: Shell, cylindrical; There are multiple electrode assemblies, all of which are arranged in the shell, and the multiple electrode assemblies are arranged in sequence along the axial direction of the shell and connected in series in sequence; There are two electrode terminals, the polarities of the two electrode terminals are opposite, the two electrode terminals are respectively installed at the opposite ends of the shell, and the electrode terminals are electrically connected to the electrode assembly arranged adjacent to them.

2. The battery cell according to claim 1, characterized in that: The electrode terminal is provided with a through hole along its axial direction. The battery cell further comprises a heat exchange pipe. The heat exchange pipe is passed through the through holes of the two electrode terminals. The electrode assembly is wound around the outer circumference of the heat exchange pipe.

3. The battery cell according to claim 2, characterized in that: A first seal is provided between the hole wall of the through hole and the outer periphery of the heat exchange tube, and the first seal seals the gap between the through hole and the heat exchange tube.

4. The battery cell according to claim 3, characterized in that: The through hole includes a first hole segment and a second hole segment arranged in sequence from the outside to the inside, and the hole diameter of the first hole segment is larger than the hole diameter of the second hole segment; the first sealing member includes a first sealing portion and a second sealing portion, the first sealing portion is arranged in the first hole segment and stopped at the bottom of the first hole segment, and the second sealing portion is arranged in the second hole segment.

5. The battery cell according to claim 3, characterized in that: The hole wall of the through hole is provided with an annular groove, and a portion of the first sealing member is embedded in the annular groove.

6. The battery cell according to claim 2, characterized in that: The battery cell includes a first insulating film, which surrounds the outer circumference of the heat exchange tube and insulates and isolates the heat exchange tube from the electrode assembly.

7. The battery cell according to claim 6, characterized in that: The first insulating film is provided with an annular convex portion, and the annular convex portion is provided between two adjacent electrode assemblies and insulates and separates the two adjacent electrode assemblies.

8. The battery cell according to claim 2, characterized in that: The end of the heat exchange tube protrudes from the outer end surface of the electrode terminal.

9. The battery cell according to any one of claims 1 to 8, characterized in that: The electrode terminal is sealed and connected to the housing via a second sealing member.

10. The battery cell according to claim 9, characterized in that: The electrode terminal includes a main body and a flange, wherein the flange is connected to the outer end of the main body and extends outward along the circumference of the main body; The second sealing member surrounds the outer circumference of the main body, and the second sealing member seals against the outer circumferential surface of the main body, and seals against the end surface of the flange portion facing the second sealing member.

11. The battery cell according to claim 9, characterized in that: The shell comprises a shell and two end covers, the shell is cylindrical, and the two end covers are respectively installed at the two end openings of the shell, and are both annularly arranged; At least one end of the shell: an insulating connector is installed in the ring of the end cover, the insulating connector is arranged in a ring shape, the electrode terminal is passed through the ring of the insulating connector, and part of the insulating connector is embedded in the second sealing member.

12. The battery cell according to claim 11, characterized in that: The insulating connector includes a first ring portion, a second ring portion and a third ring portion, the electrode terminal is inserted into 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 stoppered on the inner end surface of the end cover, and at least a portion of the second ring portion and the first ring portion are embedded in the second seal.

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

14. A battery pack, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 13.

15. A battery pack, characterized in that: It comprises a plurality of battery cells as described in any one of claims 2 to 8, as well as 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 two battery cells.

16. An electrical device, characterized in that: Comprising a battery pack as claimed in claim 14 or 15.

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