Battery pack and electric device

Abstract

The present application relates to the field of batteries. Provided are a battery pack and an electric device. The battery pack comprises a battery cell (10) and a case (20), wherein the battery cell (10) is provided with a ventilation pipe assembly (11), and first air ducts (111) are formed in an intra-pipe space of the ventilation pipe assembly (11); and the case (20) comprises two end plates (21), the two end plates (21) are respectively provided at two opposite ends of the battery cell (10), and second air ducts (211) in communication with the first air ducts (111) in manner of corresponding thereto on a one-to-one basis run through the end plates (21). With the above-described structure, the heat dissipation performance of the battery pack can be improved, the phenomenon of unbalanced heat in the middle and at the edge of the battery cell (10) can be mitigated, and the phenomenon of local overheating of the battery cell (10) can be reduced, such that the use reliability and use safety of the battery pack and the battery cell (10) thereof can be improved, the service life of the battery pack and the battery cell (10) thereof can be prolonged, and the risk of thermal runaway of the battery pack and the battery cell (10) thereof can be lowered.

Description

Battery pack and electric device

[0001] This application claims priority to two Chinese patent applications, application numbers 202411062859.5 and 202421866826.1, both filed on August 2, 2024, with the State Intellectual Property Office of the People's Republic of China, and both entitled "Battery pack and electric device", the contents of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] The present application belongs to the technical field of batteries, and in particular relates to a battery pack and an electric device. BACKGROUND

[0003] A battery pack generally includes a box body, a plurality of battery cells accommodated in the box body, and a liquid cooling plate laid on the bottom of the box body, the liquid cooling plate being in abutment with and heat-exchanging with each battery cell. However, the heat dissipation effect of the liquid cooling plate on the battery cells is not balanced, resulting in poor heat dissipation performance of the battery pack, which leads to poor use reliability, use safety and use life of the battery pack. TECHNICAL PROBLEM

[0004] The embodiments of the present application provide a battery pack and an electric device, aiming to solve the problem of poor heat dissipation performance of the battery pack, which leads to poor use reliability, use safety and use life of the battery pack. TECHNICAL SOLUTION

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the embodiments of the present application is as follows:

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

[0007] A battery cell is provided with a ventilation pipe, which is arranged along the length direction of the battery cell, and the inner space of the ventilation pipe forms a first air duct penetrating through the battery cell.

[0008] A box body is provided with two end plates, which are arranged at opposite ends of the battery cell along the length direction of the battery cell, and the end plates are provided with second air ducts corresponding to the first air ducts.

[0009] In some embodiments, the end of the ventilation pipe is sealingly connected to the end plate.

[0010] In some embodiments, the end surface of the ventilation pipe is in abutment with and welded to the inner surface of the end plate.

[0011] In some embodiments, the battery cell includes a shell, an electrode assembly and two electrode terminals.

[0012] The shell comprises a shell body and two end covers, the shell body is cylindrically arranged along the length direction of the battery cell, and the two end covers are respectively arranged at opposite ends of the shell body, and the end covers are provided with mounting holes;

[0013] The electrode assembly is wound between the outer periphery of the ventilation pipe and the inner periphery of the shell body;

[0014] The polarities of the two electrode terminals are opposite, the two electrode terminals are respectively arranged through the mounting holes of the two end covers, the electrode terminals are electrically connected with the electrode assemblies arranged adjacent thereto, the electrode terminals are provided with through holes, and the ventilation pipe is arranged through the through holes of the two electrode terminals.

[0015] In some embodiments, the battery cell comprises a plurality of electrode assemblies, and the plurality of electrode assemblies are sequentially arranged along the length direction of the battery cell and are sequentially connected in series.

[0016] In some embodiments, the end of the ventilation pipe protrudes from the outer end surface of the electrode terminal.

[0017] In some embodiments, a sealing member is arranged between the mounting hole and the electrode terminal, and the sealing member seals the gap between the mounting hole and the electrode terminal.

[0018] In some embodiments, the electrode terminal comprises a main body portion and a flange portion, the main body portion is arranged through the mounting hole, and the flange portion is connected to the outer end of the main body portion and is arranged to extend outwardly along the circumferential direction of the main body portion;

[0019] The sealing member surrounds the outer periphery of the main body portion, the sealing member seals the outer peripheral surface of the main body portion, and the sealing member seals the end surface of the flange portion facing the end surface.

[0020] In some embodiments, part of the end cover is embedded in the sealing member.

[0021] In some embodiments, the battery cell comprises an insulating film, the insulating film surrounds the outer periphery of the ventilation pipe, the opposite ends of the insulating film protrude from the outer end surfaces of the two electrode terminals, and the insulating film insulates and separates the ventilation pipe and the electrode terminals and insulates and separates the ventilation pipe and the electrode assembly.

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

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

[0024] In some embodiments, the first air duct has a projection shape same as a projection shape of the battery monomer along a length direction of the battery monomer.

[0025] In some embodiments, the second air duct has a projection shape same as a projection shape of the first air duct along a length direction of the battery monomer.

[0026] In some embodiments, the first air duct has a projection shape of a waist shape along a length direction of the battery monomer.

[0027] In some embodiments, a center line of the ventilation pipe element is arranged coincident with a center line of the battery monomer.

[0028] In a second aspect, a battery pack is provided. Advantages

[0029] The battery pack provided by the present application has the following advantages:

[0030] The battery pack provided by the present application can be arranged with a ventilation pipe element on the battery monomer, so as to form a first air duct through the battery monomer via an inner space of the ventilation pipe element. In addition, the two end plates of the box body are arranged with a second air duct corresponding to the first air duct, so as to connect the first air duct of the battery monomer to the outside of the box body via the second air duct of the two end plates. Based on this, the heat exchange airflow can flow through the second air duct of one of the end plates, the first air duct of the battery monomer, and the second air duct of the other end plate along the length direction of the battery monomer in sequence, so as to facilitate heat exchange between the heat exchange airflow and the box body, the battery monomer, etc. during the flow process, and facilitate heat dissipation of the box body, the battery monomer, etc. during the flow process. In particular, since the ventilation pipe element is arranged in the middle part of the battery monomer along the length direction of the battery monomer, the heat exchange airflow can directly and quickly take away the heat in the middle part of the battery monomer during the flow process of the first air duct, and can spread and evenly take away the heat in the edge part of the battery monomer along the circumference of the ventilation pipe element, so as to reduce the phenomenon of uneven heat distribution in the middle part and the edge part of the battery monomer, and to balance the heat distribution in the battery monomer, and to reduce the local overheating phenomenon of the battery monomer. Therefore, the heat dissipation performance of the battery pack can be optimized and improved, the heat dissipation effect of the battery monomer can be balanced and improved, the use reliability, use safety, and use life of the battery pack and the battery monomer can be maintained and improved, and the risk of thermal runaway of the battery pack and the battery monomer can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiments or the prior art description. Obviously, the drawings described below only relate to some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0032] Fig. 1 is a structural schematic diagram of a battery pack provided by some embodiments of the present application;

[0033] Fig. 2 is an enlarged view of area A provided by Fig. 1;

[0034] Fig. 3 is a front view of a battery cell provided by Fig. 1;

[0035] Fig. 4 is a sectional view along B-B provided by Fig. 3;

[0036] Fig. 5 is an enlarged view of area C provided by Fig. 4;

[0037] Fig. 6 is an enlarged view of area D provided by Fig. 4.

[0038] In the drawings, various reference signs represent:

[0039] 10-battery cell, 11-vent pipe, 111-first air duct, 12-outer shell, 121-shell, 122-end cover, 1221-mounting hole, 13-electrode assembly, 131-positive electrode tab, 132-negative electrode tab; 14-electrode terminal, 14a-positive electrode terminal, 141-punching hole, 142-main body, 143-flange part; 15-sealing member, 151-extension, 16-insulating film, 161-insulating protrusion, 17-explosion-proof valve, 18-liquid injection hole; 20-box, 21-end plate, 211-second air duct, 212-cavity; x-length direction of the battery cell, y-thickness direction of the battery cell. Embodiments of the present application

[0040] In order to make the technical problems to be solved by the present application, the technical solutions and the beneficial effects clear, the present application will be described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0041] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0042] In addition, the terms "first", "second", etc. are used only for the purpose of description, and should not be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0043] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances.

[0044] In the present application, the battery cell is the smallest unit for storing and outputting electric energy. The battery pack is a modular structure including at least two battery cells to provide higher voltage and capacity.

[0045] The battery pack usually includes a box, a plurality of battery cells contained in the box, and a liquid cooling plate laid on the bottom of the box, the liquid cooling plate abutting against and heat exchanging with each battery cell. However, in this way, the heat dissipation effect of the liquid cooling plate on the side of the battery cell abutting against it will be better, while the heat dissipation effect on other areas of the battery cell will be poorer, that is, the heat dissipation effect of the liquid cooling plate on the battery cell is uneven, resulting in poor heat dissipation performance of the battery pack, which causes poor use reliability, use safety and use life of the battery pack and its battery cells.

[0046] Therefore, the embodiments of the present application provide a battery pack, which can optimize the heat dissipation performance, can balance and improve the heat dissipation effect on the battery cell, so as to maintain and improve the use reliability, use safety and use life of the battery pack and its battery cells.

[0047] The specific implementation of the present application is described in detail as follows in combination with specific embodiments:

[0048] Referring to FIG. 1, FIG. 2, FIG. 3, and FIG. 4, some embodiments of the present application provide a battery pack, which comprises a battery monomer 10 and a box 20. The battery monomer 10 is provided with a ventilation pipe 11, which extends along the length direction x of the battery monomer 10. The pipe space of the ventilation pipe 11 forms a first air duct 111 that penetrates the battery monomer 10. The box 20 comprises two end plates 21, which are respectively arranged at the opposite ends of the battery monomer 10 along the length direction x of the battery monomer 10. The end plate 21 is provided with a second air duct 211 that communicates with the first air duct 111 one by one.

[0049] It should be noted that the box 20 is used to provide a containing space for the battery monomer 10, i.e. the battery monomer 10 is contained in the box 20. The box 20 can prevent dust, water, and other foreign matters from entering the battery monomer 10 and other components contained therein, so as to reduce the influence of external liquid or other foreign matters on the performance of the battery monomer 10 and other components, and effectively prolong the service life of the battery pack. The box 20 can adopt various structures. In some embodiments, the box 20 can comprise a frame, which is a frame-shaped structure formed by connecting frame strips end to end. The frame can define a containing space for containing the battery monomer 10. The box 20 can have various shapes, such as a cuboid. The box 20 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0050] The battery monomer 10 is the smallest unit for storing and outputting electric energy. In the box 20, one battery monomer 10 can be arranged, or at least two battery monomers 10 can be arranged. In the case where the battery monomer 10 is provided with at least two battery monomers 10, the plurality of battery monomers 10 can be arranged side by side along the thickness direction y thereof, and the plurality of battery monomers 10 can be connected in series, in parallel, or in a mixed manner. The mixed connection means that the battery monomers 10 are connected in series and in parallel. The thickness direction y of the battery monomer 10 is perpendicular to the length direction x of the battery monomer 10.

[0051] It should be further noted that the battery monomer 10 is provided with the ventilation pipe 11. The ventilation pipe 11 extends along the length direction x of the battery monomer 10 and penetrates the middle part of the end face of the battery monomer 10. The ventilation pipe 11 has a tubular structure, and the pipe space of the ventilation pipe 11 forms the first air duct 111 that penetrates the battery monomer 10 along the length direction x of the battery monomer 10, i.e. the opposite ends of the first air duct 111 communicate with the outside of the battery monomer 10. The first air duct 111 can be used for flowing heat exchange gas.

[0052] The box body 20 is provided with two end plates 21, one of which is arranged at one end of the battery monomer 10 along the length direction x of the battery monomer 10, and the other is arranged at the other end of the battery monomer 10 along the length direction x of the battery monomer 10. The end plate 21 can be arranged along the thickness direction y of the battery monomer 10 (i.e. the parallel direction of the plurality of battery monomers 10).

[0053] The end plate 21 is provided with a second air duct 211 corresponding to the first air duct 111 of the battery monomer 10, and a plurality of second air ducts 211 on the end plate 21 are arranged in the thickness direction y of the battery monomer 10. The second air duct 211 penetrates the end plate 21 along the length direction x of the battery monomer 10.

[0054] Based on this, the heat exchange airflow can flow through the second air duct 211 of one of the end plates 21, the first air duct 111 of the battery monomer 10, and the second air duct 211 of the other end plate 21 in sequence along the length direction x of the battery monomer 10. Thus, the heat exchange airflow can be heat exchanged with the box body 20, the battery monomer 10, etc. during the flow process, and especially can be heat dissipated to the box body 20, the battery monomer 10, etc. during the flow process.

[0055] Among them, the heat exchange airflow can be but not limited to air, etc.

[0056] Among them, along the length direction x of the battery monomer 10, the projection shape of the first air duct 111 and the projection shape of the second air duct 211 can be the same or different, and the projection shape of the first air duct 111 can be set as needed (for example, it can be set as a circle, a waist shape, a rectangle, etc.), and the projection shape of the second air duct 211 can be set as needed (for example, it can be set as a circle, a waist shape, a rectangle, etc.).

[0057] In summary, the battery pack provided by the embodiments of the present application can be used to set the ventilation pipe 11 on the battery monomer 10, so as to form the first air duct 111 through the battery monomer 10 via the inner space of the ventilation pipe 11. In addition, the second air duct 211 corresponding to the first air duct 111 is set on the two end plates 21 of the box 20, so as to connect the first air duct 111 of the battery monomer 10 to the outside of the box 20 via the second air duct 211 of the two end plates 21. Based on this, the heat exchange airflow can flow through the second air duct 211 of one of the end plates 21, the first air duct 111 of the battery monomer 10, and the second air duct 211 of the other end plate 21 in sequence along the length direction x of the battery monomer 10, so as to facilitate heat exchange between the heat exchange airflow and the box 20, the battery monomer 10, and the like during the flow of the heat exchange airflow, and facilitate heat dissipation of the box 20 and the battery monomer 10 during the flow of the heat exchange airflow. In particular, since the ventilation pipe 11 is arranged in the middle part of the battery monomer 10 along the length direction x of the battery monomer 10, the heat exchange airflow can directly and quickly take away the heat in the middle part of the battery monomer 10 during the flow through the first air duct 111, and can take away the heat in the edge part of the battery monomer 10 along the circumferential direction of the ventilation pipe 11, so as to reduce the phenomenon that the heat in the middle part of the battery monomer 10 is not balanced with the heat in the edge part of the battery monomer 10, balance the distribution of the heat in the battery monomer 10, and reduce the local overheating of the battery monomer 10. In this way, the heat dissipation performance of the battery pack can be optimized and improved, the heat dissipation effect of the battery monomer 10 can be balanced and improved, the use reliability, use safety, and use life of the battery pack and the battery monomer 10 can be maintained and improved, and the risk of thermal runaway of the battery pack and the battery monomer 10 can be reduced.

[0058] Please refer to FIG. 1, FIG. 2, and FIG. 3. In some embodiments of the present application, the internal part of the end plate 21 is provided with a cavity 212, which extends along the extension direction of the end plate 21 and communicates with each second air duct 211 of the end plate 21.

[0059] It should be noted that the extension direction of the end plate 21 corresponds to the thickness direction y of the battery monomer 10, that is, the parallel direction of the plurality of battery monomers 10. The cavity 212 extends along the extension direction of the end plate 21, and even extends through the end plate 21. In some embodiments, the end plate 21 can be a hollow profile, and the cavity 212 can be obtained based on the hollow of the hollow profile.

[0060] The cavity 212 can communicate with each second air duct 211 of the end plate 21, so that each second air duct 211 of the end plate 21 can communicate with each other and exchange the heat exchange airflow.

[0061] By adopting the above scheme, the end plate 21 can be connected with each second air duct 211 of the end plate 21 through the cavity 212, so as to enable each second air duct 211 of the end plate 21 to be in communication and exchange heat flow. Based on this, the heat exchange flow can flow through the cavity 212 to any second air duct 211 of the end plate 21, thereby quickly flowing through the first air duct 111 of each battery monomer 10 outside the box body 20. Thus, the circulation efficiency and heat exchange efficiency of the heat exchange flow in the battery pack and outside the battery pack can be improved, the heat dissipation performance of the battery pack can be improved, and the use reliability, use safety and use life of the battery pack and the battery monomer 10 thereof can be improved. Moreover, based on the design of the cavity 212, the weight of the end plate 21 can also be reduced accordingly, so as to reduce the weight of the battery pack and improve the energy density of the battery pack.

[0062] Please refer to FIG. 1, FIG. 2 and FIG. 3. In some embodiments of the present application, the end of the ventilation pipe 11 is sealingly connected with the end plate 21.

[0063] It should be noted that the end of the ventilation pipe 11, i.e. the end of the ventilation pipe 11 along the length direction x of the battery monomer 10. The end of the ventilation pipe 11 is connected with the end plate 21, which can be fixedly connected (such as welding, bonding, etc.), or can be detachably connected (such as bolt connection, etc.). The end surface of the ventilation pipe 11 directly sealingly abuts the inner side surface of the end plate 21, or indirectly sealingly connects through other sealing structures (such as a sealing ring).

[0064] By adopting the above scheme, by sealingly connecting the end of the ventilation pipe 11 with the end plate 21, the installation position and state of the ventilation pipe 11 relative to the end plate 21 can be stabilized, the relative position of the first air duct 111 of the ventilation pipe 11 and the second air duct 211 of the end plate 21 can be accurately positioned and reliably stabilized, and the corresponding first air duct 111 and second air duct 211 can be sealingly butted. Based on this, the heat exchange flow can quickly and smoothly flow through the corresponding first air duct 111 and second air duct 211, the heat exchange flow can be prevented from leaking from the connection between the ventilation pipe 11 and the end plate 21 and flowing to other areas of the box body 20, the circulation efficiency and heat exchange efficiency of the heat exchange flow in the first air duct 111 and the second air duct 211 can be improved, the heat exchange path and time can be shortened, thereby the heat dissipation performance of the battery pack can be improved, and the use reliability, use safety and use life of the battery pack and the battery monomer 10 thereof can be improved.

[0065] And, based on the connection relationship between the ventilation pipe 11 and the two end plates 21, the ventilation pipe 11 can form a beam structure (which can also be understood as a longitudinal beam) between the two end plates 21, at this time the two end plates 21 correspond to the cross beam, thereby improving the structural strength, structural stability and structural reliability of the battery pack, and improving the resistance of the battery pack to vibration and impact; at the same time, since the ventilation pipe 11 forms a beam structure between the two end plates 21, that is, the ventilation pipe 11 itself can serve as the longitudinal beam of the battery pack, therefore, the longitudinal beam structure separately provided in the box 20 of the battery pack can be omitted, and even the support structure for supporting the battery monomer 10 can be omitted, based on this, the structural design of the box 20 and the battery pack can be simplified, the components of the box 20 and the battery pack can be effectively reduced, the weight of the battery pack can be reduced, and the energy density of the battery pack can be improved.

[0066] And, based on the sealed butt joint of the first air duct 111 and the second air duct 211, the sealing performance of the inside of the battery pack relative to the outside can be improved on the basis of facilitating the flow of heat exchange airflow, thereby impeding the intrusion of external dust, moisture and other impurities into the box 20 through the connection between the ventilation pipe 11 and the end plate 21, maintaining the stability of the internal environment of the battery pack, and improving the use reliability, use safety and use life of the battery pack and its battery monomer 10.

[0067] Please refer to FIG. 1, FIG. 2, FIG. 3, in some embodiments of the present application, the end face of the ventilation pipe 11 abuts and is welded with the inner side face of the end plate 21.

[0068] By adopting the above scheme, by abutting and welding the end face of the ventilation pipe 11 with the inner side face of the end plate 21, on the one hand, the seamless connection and sealed connection between the ventilation pipe 11 and the end plate 21 can be achieved directly through abutting and welding, based on this, the connection convenience and connection efficiency of the sealed connection between the ventilation pipe 11 and the end plate 21 can be improved, the reliability of the sealed butt joint of the first air duct 111 and the second air duct 211 can be improved, thereby impeding the intrusion of external dust, moisture and other impurities into the box 20 through the connection between the ventilation pipe 11 and the end plate 21, maintaining the stability of the internal environment of the battery pack, and improving the use reliability, use safety and use life of the battery pack and its battery monomer 10. On the one hand, the connection strength and connection reliability between the ventilation pipe 11 and the end plate 21 can be improved, thereby improving the structural strength, structural stability and structural reliability of the battery pack, and improving the resistance of the battery pack to vibration and impact. On the one hand, the end face of the ventilation pipe 11 can be closely fitted with the inner side face of the end plate 21, the heat exchange airflow can flow quickly and smoothly through the corresponding first air duct 111 and second air duct 211, the circulation efficiency and heat exchange efficiency of the heat exchange airflow in the first air duct 111 and the second air duct 211 can be improved, thereby improving the heat dissipation performance of the battery pack, and improving the use reliability, use safety and use life of the battery pack and its battery monomer 10.

[0069] Please refer to FIG. 3, FIG. 4, FIG. 5, and FIG. 6. In some embodiments of the present application, the battery cell 10 comprises a housing 12, an electrode assembly 13, and two electrode terminals 14. The housing 12 comprises a shell 121 and two end caps 122. The shell 121 extends along the length direction x of the battery cell 10 and is in a cylindrical shape. The two end caps 122 are respectively installed at opposite ends of the shell 121, and the end cap 122 is provided with a mounting hole 1221. The electrode assembly 13 is wound between the outer periphery of the vent pipe 11 and the inner periphery of the shell 121. The two electrode terminals 14 are opposite in polarity, and the two electrode terminals 14 are respectively installed in the mounting holes 1221 of the two end caps 122. The electrode terminal 14 and the electrode assembly 13 adjacent to it are electrically connected, and the electrode terminal 14 is provided with a through hole 141, and the vent pipe 11 is inserted into the through hole 141 of the two electrode terminals 14.

[0070] It should be noted that the shell 121 extends along the length direction x of the battery cell 10, and the shell 121 is in a cylindrical shape, such as a circular cylindrical shape, a waist-shaped cylindrical shape, or a polygonal cylindrical shape. The end cap 122 is provided with two, and the two end caps 122 are respectively installed at the two end ports of the shell 121 along the length direction x of the battery cell 10. The two end caps 122 are both provided with a mounting hole 1221, and the mounting hole 1221 penetrates the end cap 122 along the length direction x of the battery cell 10.

[0071] The electrode terminal 14 (also known as the pole) is a component for outputting or inputting electric energy. The electrode terminal 14 is provided with two, and the two electrode terminals 14 are opposite in polarity, that is, one of the electrode terminals 14 is a positive electrode terminal 14a, and the other electrode terminal 14 is a negative electrode terminal. The two electrode terminals 14 are respectively installed in the mounting holes 1221 of the two end caps 122, so that the two electrode terminals 14 are both stably installed in position and state relative to the housing 12.

[0072] The two electrode terminals 14 are both provided with a through hole 141, and the through hole 141 penetrates the electrode terminal 14 along the length direction x of the battery cell 10. The vent pipe 11 is inserted into the through hole 141 of the two electrode terminals 14.

[0073] Based on this, the shell 121, the two end caps 122, the vent pipe 11, and the two electrode terminals 14 can collectively enclose an internal space, which can be substantially isolated from the external environment of the battery cell 10, and which can be used to accommodate and protect at least one electrode assembly 13.

[0074] It should be further noted that the electrode assembly 13 is a component in which electrochemical reactions occur in the battery cell 10. The electrode assembly 13 includes two groups of polar plates of opposite polarity, i.e., positive polar plates and negative polar plates, and a separator that separates the positive polar plates and the negative polar plates. The positive polar plates, the separator, and the negative polar plates can be processed into the electrode assembly 13 in a winding manner. The electrode assembly 13 is wound and arranged between the outer periphery of the ventilation pipe 11 and the inner periphery of the housing 121.

[0075] In the electrode assembly 13, the portion of the positive polar plate that does not have active material constitutes a positive polar tab 131, and the portion of the negative polar plate that does not have active material constitutes a negative polar tab 132. The positive polar tab 131 and the negative polar tab 132 are current transmission ends of the electrode assembly 13 and are used to transmit current. The positive polar tab 131 and the negative polar tab 132 are respectively located at two ends of the electrode assembly 13 along the length direction x of the battery cell 10.

[0076] The electrode terminal 14 is electrically connected to the electrode assembly 13 arranged adjacent thereto. That is, the positive electrode terminal 14a is electrically connected to the positive polar tab 131 of the electrode assembly 13 arranged adjacent thereto, and the negative electrode terminal is electrically connected to the negative polar tab 132 of the electrode assembly 13 arranged adjacent thereto. The electrode terminal 14 and the electrode assembly 13 arranged adjacent thereto can be directly electrically connected or indirectly electrically connected via other components (for example, a jumper), and the electrical connection mode can be achieved by welding and the like, but is not limited thereto.

[0077] By adopting the above scheme, the internal space substantially isolated from the external environment can be formed based on the housing 121, the two end covers 122, the ventilation pipe 11, and the two electrode terminals 14, so as to accommodate and protect at least one electrode assembly 13 via the internal space. The input (i.e., storage) and output of electrical energy can be achieved based on the electrical connection relationship between the electrode terminal 14 and the electrode assembly 13 arranged adjacent thereto. Based on this, the battery cell 10 can be modularized, integrated, and structurally optimized, and the use performance and electrochemical performance of the battery cell 10 can be maintained and improved.

[0078] In addition, in combination with the design that the electrode assembly 13 is wound between the outer periphery of the ventilation pipe 11 and the inner periphery of the shell 121, the heat exchange airflow can directly and quickly adjust the middle heat of the electrode assembly 13 and the middle heat of the electrode terminal 14 during the process that the heat exchange airflow flows through the first air duct 111 of the ventilation pipe 11, and the heat exchange airflow can diffuse along the circumference of the ventilation pipe 11 to uniformly adjust the edge heat of the electrode assembly 13 and the edge heat of the electrode terminal 14, so that the middle heat and the edge heat of the electrode assembly 13 and the electrode terminal 14 can be balanced, the heat distribution in the battery monomer 10 can be balanced, and the local overheating of the battery monomer 10 can be reduced. Therefore, the risk of thermal runaway of the battery monomer 10 can be reduced, and the performance stability, use reliability, use safety and use life of the battery monomer 10 can be improved.

[0079] Referring to FIGS. 4, 5 and 6, in some embodiments of the present application, the battery monomer 10 comprises a plurality of electrode assemblies 13, which are sequentially arranged along the length direction x of the battery monomer 10 and are sequentially connected in series.

[0080] It should be noted that the shell 12 is provided with a plurality of electrode assemblies 13, and the plurality of electrode assemblies 13 are wound between the outer periphery of the ventilation pipe 11 and the inner periphery of the shell 121. The plurality of electrode assemblies 13 are sequentially arranged along the length direction x of the battery monomer 10.

[0081] The positive electrode tabs 131 of all the electrode assemblies 13 are arranged at one end of the electrode assembly 13 facing the positive electrode terminal 14a. The negative electrode tabs 132 of all the electrode assemblies 13 are arranged at one end of the electrode assembly 13 facing the negative electrode terminal. Based on this, the negative electrode tab 132 of one of the two adjacent electrode assemblies 13 and the positive electrode tab 131 of the other electrode assembly 13 can face each other to form an electrical connection, so that the two adjacent electrode assemblies 13 are connected in series. Similarly, the electrode assemblies 13 can be sequentially connected in series along the axial direction of the shell 12. The electrical connection between the negative electrode tab 132 of the electrode assembly 13 and the positive electrode tab 131 of the adjacent electrode assembly 13 can be achieved by welding or other methods.

[0082] The electrode assembly 13 closest to the positive electrode terminal 14a can have its positive electrode tab 131 facing the positive electrode terminal 14a, so as to facilitate the electrical connection between the positive electrode terminal 14a and the positive electrode tab 131 of the electrode assembly 13 arranged adjacent to the positive electrode terminal 14a. The electrode assembly 13 closest to the negative electrode terminal can have its negative electrode tab 132 facing the negative electrode terminal, so as to facilitate the electrical connection between the negative electrode terminal and the negative electrode tab 132 of the electrode assembly 13 arranged adjacent to the negative electrode terminal. Therefore, the two electrode terminals 14 can be electrically connected to the electrode assemblies 13, so as to facilitate the output or input of electric energy.

[0083] By adopting the above scheme, the output voltage of the battery monomer 10 can be equal to the sum of the voltages of the plurality of electrode assemblies 13. Based on this, compared with the prior battery monomer 10, the battery monomer 10 provided in the embodiment can improve the output voltage of itself. In this way, the number of battery monomers 10 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 prompted to meet the demand, and the overall performance and safety performance of the battery pack can be maintained and improved.

[0084] In addition, based on the series connection relationship between the two electrode terminals 14 and the electrode assemblies 13, the current path can be shortened, the energy loss of the battery monomer 10 in the charging and discharging process can be reduced, and the energy transfer efficiency can be improved.

[0085] Please refer to FIG. 1, FIG. 4, and FIG. 5. In some embodiments of the present application, the end of the ventilation pipe 11 protrudes from the outer end surface of the electrode terminal 14. It should be noted that the outer end surface of the electrode terminal 14 is the end surface of the electrode terminal 14 facing the outside of the battery monomer 10.

[0086] By adopting the above scheme, by making the end of the ventilation pipe 11 protrude from the outer end surface of the electrode terminal 14, the ventilation pipe 11 can be connected to the end plate 21 of the battery pack and communicated with the second air duct 211 of the end plate 21 through the part of the ventilation pipe 11 protruding from the outer end surface of the electrode terminal 14. Therefore, the connection convenience of the ventilation pipe 11 of the battery monomer 10 and the end plate 21 of the battery pack can be improved, the flow and distribution of the heat exchange airflow in the battery pack can be promoted, and the assembly convenience and heat dissipation performance of the battery pack can be improved.

[0087] Of course, in other embodiments, the end of the ventilation pipe 11 can be substantially flush with the outer end surface of the electrode terminal 14.

[0088] Please refer to FIG. 4 and FIG. 5. In some embodiments of the present application, a sealing member 15 is arranged between the mounting hole 1221 and the electrode terminal 14, and the sealing member 15 seals the gap between the mounting hole 1221 and the electrode terminal 14.

[0089] It should be noted that the sealing member 15 is a component with sealing performance. The sealing member 15 is arranged in a ring shape, and the sealing member 15 is sleeved between the outer periphery of the electrode terminal 14 and the mounting hole 1221. The sealing member 15 seals the gap between the outer periphery of the electrode terminal 14 and the mounting hole 1221. Corresponding to the two electrode terminals 14, two sealing members 15 are also arranged correspondingly.

[0090] By adopting the above scheme, the gap between the outer periphery of the electrode terminal 14 and the mounting hole 1221 can be sealed by the sealing member 15, so as to improve the sealing performance between the outer periphery of the electrode terminal 14 and the mounting hole 1221. Based on this, the liquid (such as electrolyte) in the battery monomer 10 can be prevented from leaking out through the gap between the outer periphery of the electrode terminal 14 and the mounting hole 1221, the gas generated in the charging and discharging process of the battery monomer 10 can be prevented from overflowing through the gap between the outer periphery of the electrode terminal 14 and the mounting hole 1221, and the external dust, moisture and other impurities can be prevented from invading the inside of the battery monomer 10 through the gap between the outer periphery of the electrode terminal 14 and the mounting hole 1221, so as to reduce the risk of reducing the performance and safety hazard of the battery monomer 10 due to liquid leakage, gas overflow and impurity pollution, maintain the stability of the internal environment of the battery monomer 10, and improve the use reliability, use safety and use life of the battery monomer 10.

[0091] In some embodiments, the sealing member 15 is an insulating sealant. In this way, the sealing member 15 can have insulating performance, and the outer periphery of the electrode terminal 14 and the end cover 122 can be electrically insulated through the sealing member 15. Of course, in other embodiments, the outer periphery of the electrode terminal 14 and the end cover 122 can be electrically insulated through other components (such as an insulating coating).

[0092] Please refer to FIG. 4 and FIG. 5, in some embodiments of the present application, the electrode terminal 14 includes a main body part 142 and a flange part 143, the main body part 142 is arranged through the mounting hole 1221, and the flange part 143 is connected to the outer end of the main body part 142 and extends outward along the circumference of the main body part 142. The sealing member 15 surrounds the outer periphery of the main body part 142, and seals against the outer circumferential surface of the main body part 142 and the end surface of the flange part 143 facing it.

[0093] It should be noted that the main body part 142 of the electrode terminal 14 is arranged through the mounting hole 1221 and is electrically connected to the electrode assembly 13 arranged adjacent to it. The flange part 143 of the electrode terminal 14 is connected to the outer end of the main body part 142 close to the outside of the battery monomer 10, and the flange part 143 extends outward along the circumference of the main body part 142 relative to the main body part 142, so that a stepped structure is formed between the flange part 143 and the main body part 142.

[0094] The sealing member 15 is annularly arranged and is sleeved between the outer periphery of the main body part 142 and the mounting hole 1221. The inner annular surface of the sealing member 15 seals against the outer circumferential surface of the main body part 142. The side surface of the sealing member 15 facing the flange part 143 seals against the side surface of the flange part 143 facing the sealing member 15.

[0095] By adopting the above scheme, the inner annular surface of the sealing member 15 can abut against the outer circumferential surface of the main body portion 142, and the sides of the sealing member 15 and the flange portion 143 facing each other can abut against each other. Based on this, two sealing surfaces can be formed between the sealing member 15 and the electrode terminal 14, the sealing area between the sealing member 15 and the electrode terminal 14 can be increased, the tightness, durability, reliability and stability of the sealing connection between the sealing member 15 and the electrode terminal 14 can be improved, the risk of loosening or displacement of the sealing member 15 relative to the electrode terminal 14 can be reduced, and thus the sealing reliability of the sealing member 15 between the electrode terminal 14 and the mounting hole 1221 can be improved, and the risk of sealing failure of the sealing member 15 can be reduced.

[0096] Of course, in other embodiments, the electrode terminal 14 can adopt other structural designs, for example, the electrode terminal 14 can omit the flange portion 143, for example, the electrode terminal 14 can be provided with more parts to form more stepped structures, for example, the outer circumferential surface of the electrode terminal 14 can be provided with a groove for mounting the sealing member 15.

[0097] Please refer to FIG. 4 and FIG. 5, in some embodiments of the present application, part of the end cover 122 is embedded in the sealing member 15. It should be noted that part of the end cover 122, especially the part along the hole of the mounting hole 1221, is embedded in the sealing member 15.

[0098] By adopting the above scheme, by embedding part of the end cover 122 (especially the part along the hole of the mounting hole 1221) in the sealing member 15, the connection tightness and connection strength between the end cover 122 and the sealing member 15 can be enhanced. Based on this, the tightness, durability, reliability and stability of the sealing connection between the sealing member 15 and the end cover 122 can be improved, and thus the sealing reliability of the sealing member 15 between the electrode terminal 14 and the mounting hole 1221 can be improved, and the risk of sealing failure of the sealing member 15 can be reduced.

[0099] Of course, in other embodiments, the hole of the mounting hole 1221 can be sealed to abut against the outer periphery of the sealing member 15. Alternatively, other components can be sealed in the mounting hole 1221 and embedded in the sealing member 15, so as to maintain the reliability of the sealing connection between the sealing member 15 and the end cover 122 through the other components.

[0100] In some embodiments, sealing treatment can be performed between the through hole 141 and the ventilation pipe 11, for example, sealing glue can be applied to the outer hole of the through hole 141, for example, a sealing ring can be sleeved between the hole wall of the through hole 141 and the outer periphery of the ventilation pipe 11.

[0101] Referring to FIG. 4, FIG. 5, and FIG. 6, in some embodiments of the present application, the battery cell 10 includes an insulating film 16, which is wrapped around the outer periphery of the ventilation pipe 11, and the opposite ends of the insulating film 16 protrude from the outer end surfaces of the two electrode terminals 14, respectively. The insulating film 16 insulates and separates the ventilation pipe 11 from the electrode terminals 14 and insulates and separates the ventilation pipe 11 from the electrode assembly 13.

[0102] It should be noted that the insulating film 16 is a film structure with insulating properties. The insulating film 16 is wrapped around and wound around the outer periphery of the ventilation pipe 11.

[0103] Along the length direction x of the battery cell 10, the opposite ends of the insulating film 16 protrude from the outer end surfaces of the two electrode terminals 14, respectively. Based on this, the insulating film 16 can cover the region of the outer peripheral surface of the ventilation pipe 11 corresponding to the electrode assembly 13 to insulate and separate the ventilation pipe 11 from the electrode assembly 13, thereby causing the ventilation pipe 11 and the electrode assembly 13 to be electrically insulated. The insulating film 16 can also cover the region of the outer peripheral surface of the ventilation pipe 11 corresponding to the electrode terminals 14 to insulate and separate the ventilation pipe 11 from the electrode terminals 14, thereby causing the ventilation pipe 11 and the electrode terminals 14 to be electrically insulated.

[0104] By adopting the above scheme, the insulating film 16 wrapped around and wound around the outer periphery of the ventilation pipe 11 can insulate and separate the ventilation pipe 11 from the electrode assembly 13 and insulate and separate the ventilation pipe 11 from the electrode terminals 14. Based on this, the ventilation pipe 11 and the electrode assembly 13, and the ventilation pipe 11 and the electrode terminals 14 can be electrically insulated, respectively, which can reduce the risk of short circuit between the ventilation pipe 11 and the electrode assembly 13 and between the ventilation pipe 11 and the electrode terminals 14, and can improve the use reliability, use safety, and use life of the battery cell 10.

[0105] Of course, in other embodiments, the ventilation pipe 11 and the electrode terminals 14, or the ventilation pipe 11 and the electrode assembly 13, can be electrically insulated via other components, such as an insulating coating.

[0106] Referring to FIG. 4 and FIG. 6, in some embodiments of the present application, when the battery cell 10 includes a plurality of electrode assemblies 13 arranged in sequence along the length direction x of the battery cell 10 and connected in sequence, the insulating film 16 is provided with an insulating protrusion 161, which is arranged in a ring shape and is arranged between the adjacent two electrode assemblies 13 to insulate and separate the adjacent two electrode assemblies 13.

[0107] It should be noted that the insulating film 16 can increase its winding thickness between the adjacent two electrode assemblies 13 to form the ring-shaped insulating protrusion 161. The insulating protrusion 161 can be arranged between the adjacent two electrode assemblies 13 to insulate and separate the adjacent two electrode assemblies 13.

[0108] By adopting the above scheme, the annular insulating protrusion 161 arranged between the two adjacent electrode assemblies 13 can form an insulating barrier between the two adjacent electrode assemblies 13, so as to insulate and separate the two adjacent electrode assemblies 13. Based on this, the risk of short circuit caused by direct contact between the adjacent electrode assemblies 13 can be reduced, and the use reliability, use safety and use life of the battery monomer 10 can be improved. In addition, the insulating protrusion 161 can also function as limiting and positioning the two adjacent electrode assemblies 13 to a certain extent, so that the positions of the plurality of electrode assemblies 13 on the outer periphery of the ventilation pipe 11 can be stabilized, and the structural reliability and structural stability of the battery monomer 10 can be improved.

[0109] Of course, in other embodiments, the outer periphery of the ventilation pipe 11 can be provided with a protrusion between the two adjacent electrode assemblies 13, and the part of the insulating film 16 wound on the protrusion can also play the role of “insulating and separating the two adjacent electrode assemblies 13”.

[0110] Please refer to FIG. 3, in some embodiments of the present application, at least one end of the shell 12 is provided with an explosion-proof valve 17, and the explosion-proof valve 17 is arranged on the circumferential side of the electrode terminal 14.

[0111] It should be noted that the shell 12 is provided with an explosion-proof valve 17 at one end or opposite ends along the length direction x of the battery monomer 10. The explosion-proof valve 17 is arranged on the circumferential side of the electrode terminal 14, based on which the explosion-proof valve 17 can correspond to the space where the electrode assembly 13 is located. The explosion-proof valve 17 can be used to release the internal pressure when the internal pressure (or temperature) of the battery monomer 10 reaches a threshold value.

[0112] By adopting the above scheme, the explosion-proof valve 17 located on the circumferential side of the electrode terminal 14 can be arranged at one end or opposite ends of the shell 12 along the length direction x of the battery monomer 10. Based on this, the explosion-proof valve 17 can correspond to the space where the electrode assembly 13 is located, so as to facilitate the release of the internal pressure when the internal pressure (or temperature) of the space where the electrode assembly 13 is located reaches a threshold value, thereby improving the use reliability, use safety and use life of the battery monomer 10.

[0113] Of course, in other embodiments, the explosion-proof valve 17 can be arranged on other wall portions of the shell 12.

[0114] Please refer to FIG. 3, FIG. 4 and FIG. 5, in some embodiments of the present application, at least one end of the shell 12 is provided with a liquid injection hole 18, and the liquid injection hole 18 is arranged on the circumferential side of the electrode terminal 14.

[0115] It should be noted that the shell 12 is provided with a liquid injection hole 18 at one end or opposite ends along the length direction x of the battery monomer 10. The liquid injection hole 18 is arranged on the circumferential side of the electrode terminal 14, based on which the liquid injection hole 18 can correspond to the space where the electrode assembly 13 is located. The liquid injection hole 18 can be used to inject electrolyte into the space where the electrode assembly 13 is located.

[0116] By adopting the above scheme, the injection hole 18 located at the side of the electrode terminal 14 can be arranged at one end or opposite ends of the shell 12 along the length direction x of the battery monomer 10. Based on this, the injection hole 18 can be corresponded to the space where the electrode assembly 13 is located, thereby facilitating the injection of electrolyte into the space where the electrode assembly 13 is located through the injection hole 18 in the case that the battery monomer 10 is substantially assembled, so that the use performance and electrochemical performance of the battery monomer 10 can be maintained.

[0117] As shown in FIG. 3 and FIG. 5, in some embodiments, the sealing member 15 is provided with an extension 151 arranged at the inner side of the injection hole 18, which is used to cooperate to realize the sealing treatment of the injection hole 18 after the injection is completed.

[0118] Of course, in other embodiments, the injection hole 18 can be arranged at other wall portions of the shell 12.

[0119] Please refer to FIG. 3 and FIG. 4, in some embodiments of the present application, the projection shape of the first air duct 111 along the length direction x of the battery monomer 10 is the same as the projection shape of the battery monomer 10. For example, the projection shape of the first air duct 111 along the length direction x of the battery monomer 10 is circular or waist-shaped, etc., the same as the projection shape of the battery monomer 10.

[0120] By adopting the above scheme, the projection shape of the first air duct 111 along the length direction x of the battery monomer 10 can be the same as the projection shape of the battery monomer 10 along the length direction x thereof. Based on this, the heat exchange airflow flowing in the first air duct 111 can be spread along the circumferential direction of the ventilation pipe 11, and can evenly take away the heat of each region of the battery monomer 10, so that the heat dissipation effect of each region of the battery monomer 10 can be balanced, the heat dissipation efficiency can be improved, and the heat dissipation performance of the battery pack can be optimized.

[0121] Of course, in other embodiments, the projection shape of the first air duct 111 along the length direction x of the battery monomer 10 can be different from the projection shape of the battery monomer 10 along the length direction x thereof.

[0122] Please refer to FIG. 1, FIG. 2 and FIG. 3, in some embodiments of the present application, the projection shape of the second air duct 211 along the length direction x of the battery monomer 10 is the same as the projection shape of the first air duct 111. For example, the projection shape of the second air duct 211 along the length direction x of the battery monomer 10 is circular or waist-shaped, etc., the same as the projection shape of the first air duct 111.

[0123] By adopting the above scheme, the projection shape of the second air duct 211 along the length direction x of the battery monomer 10 can be the same as the projection shape of the first air duct 111 along the length direction x of the battery monomer 10. Based on this, the shape of the second air duct 211 can be matched with the shape of the first air duct 111, the heat exchange airflow can flow smoothly and transition smoothly between the second air duct 211 and the first air duct 111, the expansion and contraction of the heat exchange airflow due to the shape difference between the second air duct 211 and the first air duct 111 can be reduced, the flow resistance of the heat exchange airflow can be reduced, and the circulation efficiency and heat exchange efficiency of the heat exchange airflow can be improved, thereby improving the heat dissipation performance of the battery pack.

[0124] In addition, the shape of the second air duct 211 is matched with the shape of the first air duct 111, which can facilitate the sealing and docking of the second air duct 211 and the first air duct 111, and also facilitate the sealing and connection between the ventilation pipe 11 and the end plate 21.

[0125] Of course, in other embodiments, the projection shape of the second air duct 211 along the length direction x of the battery monomer 10 can be different from the projection shape of the first air duct 111 along the length direction x of the battery monomer 10.

[0126] Please refer to FIG. 3 and FIG. 4, in some embodiments of the present application, the projection shape of the first air duct 111 along the length direction x of the battery monomer 10 is in the shape of a waist.

[0127] By adopting the above scheme, by making the projection shape of the first air duct 111 along the length direction x of the battery monomer 10 in the shape of a waist, the heat dissipation area of the first air duct 111 can be enlarged, the contact area of the heat exchange airflow flowing in the first air duct 111 with each region of the battery monomer 10 can be increased, thereby improving the heat dissipation effect and heat dissipation efficiency of each region of the battery monomer 10, and optimizing and improving the heat dissipation performance of the battery pack.

[0128] Of course, in other embodiments, the projection shape of the first air duct 111 along the length direction x of the battery monomer 10 can be in other shapes, for example, can be in a circular shape.

[0129] Please refer to FIG. 3 and FIG. 4, in some embodiments of the present application, the center line of the ventilation pipe 11 is arranged to coincide with the center line of the battery monomer 10.

[0130] By adopting the above scheme, by setting the center line of the ventilation pipe 11 to coincide with the center line of the battery monomer 10, the ventilation pipe 11 can be centrally arranged at the center of the battery monomer 10. Based on this, the ventilation pipe 11 can be optimally arranged in the core area of the battery monomer 10 where heat is generated more, the heat exchange flow flowing in the first air duct 111 can be directly and quickly taken away the heat of the core area of the battery monomer 10, the heat exchange flow flowing in the first air duct 111 can be evenly taken away the heat of the edge area of the battery monomer 10 along the circumference of the ventilation pipe 11, thereby the heat can be evenly distributed inside the battery monomer 10, the local overheating phenomenon of the battery monomer 10 can be reduced, and the heat dissipation performance of the battery pack can be optimized and improved.

[0131] Of course, in other embodiments, the center line of the ventilation pipe 11 and the center line of the battery monomer 10 can be arranged with a spacing.

[0132] Please refer to FIG. 1, some embodiments of the present application provide a power consuming device, which comprises the battery pack provided by the embodiments of the present application.

[0133] By adopting the above scheme, the power consuming device can optimize the performance, use reliability and use safety of the power consuming device by applying the battery pack provided by the embodiments of the present application.

[0134] The battery pack disclosed in the embodiments of the present application can be used in a power consuming device using the battery pack as a power supply, or in various energy storage systems using the battery pack as an energy storage element. The power consuming device can be, but is not limited to, a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, for example, a game machine, an electric automobile toy, an electric ship toy and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator and an electric planer, etc.

[0135] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement or improvement 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 pack, comprising: A battery cell is provided with a ventilation duct, which extends along the length of the battery cell, and the space inside the ventilation duct forms a first air duct that runs through the battery cell. The housing includes two end plates, which are respectively disposed at opposite ends of the battery cell along the length of the battery cell. The end plates are provided with a second air duct that corresponds to and communicates with the first air duct.

2. The battery pack as claimed in claim 1, wherein, The end of the ventilation duct is sealed to the end plate.

3. The battery pack as described in claim 2, wherein, The end face of the ventilation duct abuts against and is welded to the inner side of the end plate.

4. The battery pack as claimed in claim 1, wherein, The battery cell includes a casing, an electrode assembly, and two electrode terminals; The outer casing includes a housing and two end caps. The housing extends along the length of the battery cell and is cylindrical. The two end caps are respectively installed at opposite ends of the housing, and each end cap has a through mounting hole. The electrode assembly is wound between the outer periphery of the ventilation duct and the inner periphery of the housing; The two electrode terminals have opposite polarities and are respectively installed through the mounting holes of the two end caps. The electrode terminals are electrically connected to the electrode assemblies arranged adjacent to them. The electrode terminals are provided with through holes, and the ventilation pipe is provided through the through holes of the two electrode terminals.

5. The battery pack as claimed in claim 4, wherein, The battery cell includes multiple electrode assemblies, which are arranged sequentially and connected in series along the length of the battery cell.

6. The battery pack as claimed in claim 4, wherein, The end of the ventilation duct protrudes beyond the outer end face of the electrode terminal.

7. The battery pack as claimed in claim 4, wherein, A sealing element is provided between the mounting hole and the electrode terminal, and the sealing element seals the gap between the mounting hole and the electrode terminal.

8. The battery pack as claimed in claim 7, wherein, The electrode terminal includes a main body and a flange. The main body is installed through the mounting hole, and the flange is connected to the outer end of the main body and extends outward along the circumference of the main body. The seal surrounds the outer periphery of the main body, and the seal abuts against the outer peripheral surface of the main body and the end face of the flange facing thereto.

9. The battery pack as claimed in claim 7, wherein, The end cap is partially embedded in the seal.

10. The battery pack of claim 4, wherein, The battery cell includes an insulating film that surrounds the outer periphery of the ventilation duct. The two opposite ends of the insulating film protrude from the outer end faces of the two electrode terminals. The insulating film provides insulation between the ventilation duct and the electrode terminals, and also provides insulation between the ventilation duct and the electrode assembly.

11. The battery pack according to any one of claims 4-10, 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.

12. The battery pack according to any one of claims 1-10, wherein, Along the length of the battery cell, the projected shape of the first air duct is the same as the projected shape of the battery cell. And / or, along the length of the battery cell, the projected shape of the second air duct is the same as the projected shape of the first air duct; And / or, along the length of the battery cell, the projected shape of the first air duct is waist-shaped.

13. The battery pack according to any one of claims 1-10, wherein, The centerline of the ventilation duct is aligned with the centerline of the battery cell.

14. An electrical device comprising a battery pack as claimed in any one of claims 1-13.

Images