Battery monomer and battery

Abstract

The utility model relates to the technical field of batteries, in particular to a single battery and a battery. According to the technical scheme, the first part is arranged on the first wall, so that heat transfer and exchange can be conducted between the first part and the first wall, the second part is connected with the first part and extends in the direction, away from the first wall, of the first part, and heat transfer and exchange can be rapidly conducted between the second part and the first part. All the second parts are arranged between the electrode assembly and the second wall, and heat can be quickly transferred and exchanged between the second wall and the electrode assembly through the second parts. Wherein the number of the electrode assemblies is multiple, and the second part arranged between every two adjacent electrode assemblies exists in all the second parts, so that heat between the two electrode assemblies can be quickly exchanged, and the temperature of the two electrode assemblies can be effectively managed and adjusted. Thus, the thermal management performance of the battery cell is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell and a battery. Background Art

[0002] During battery use, if the temperature of the battery cell is too high, it will affect the battery's safety performance; if the temperature of the battery cell is too low, it will affect the battery's performance. Therefore, how to improve the battery's safety performance while improving the battery's performance is an issue worthy of attention. Utility Model Content

[0003] Based on this, the present application provides a battery cell and a battery to improve the battery's performance while enhancing the battery's safety performance.

[0004] In a first aspect, an embodiment of the present application provides a battery cell, comprising:

[0005] The housing comprises a shell and an end cover, wherein the shell comprises a first wall and a second wall arranged around the periphery of the first wall, the first wall and the second wall defining a receiving cavity and an opening communicating with the receiving cavity, the opening being arranged opposite to the first wall, and the end cover sealing the opening;

[0006] an electrode assembly disposed in the accommodating cavity; and

[0007] A heat pipe is disposed in the accommodating cavity; the heat pipe includes a first portion and at least one second portion, the first portion is disposed on the first wall, and the second portion is connected to the first portion and extends along the direction of the first portion away from the first wall;

[0008] wherein among all the second portions, there is a second portion disposed between the electrode assembly and the second wall; and / or

[0009] There are a plurality of electrode assemblies, and among all the second portions, there is a second portion located between two adjacent electrode assemblies.

[0010] In one embodiment, the second wall includes a plurality of sub-walls sequentially arranged around the periphery of the first wall and sequentially connected;

[0011] The plurality of sub-walls include two first sub-walls arranged opposite to each other along a first direction, the two first sub-walls being the walls with the largest areas among the plurality of sub-walls; the first direction is perpendicular to the direction in which the opening is opened;

[0012] Among all the second portions, there is a second portion located between the two first sub-walls and the electrode assembly.

[0013] In one embodiment, the second portion provided between the two first sub-walls and the electrode assembly is the first target portion;

[0014] The two first target parts are respectively arranged at two ends of the first part along the first direction, and the second part is attached to the corresponding first sub-wall.

[0015] In one embodiment, a plurality of heat pipes are provided, and the plurality of heat pipes are arranged sequentially along the second direction;

[0016] The first direction, the second direction and the direction in which the opening is opened are perpendicular to each other.

[0017] In one embodiment, the outer contour of the orthographic projection of the electrode assembly on the reference surface is located within the outer contour range of the orthographic projection of all heat pipes on the reference surface; the reference surface is a plane perpendicular to the first direction.

[0018] In one embodiment, the second wall includes a plurality of sub-walls sequentially arranged around the periphery of the first wall and sequentially connected;

[0019] The remaining walls among the multiple sub-walls except the wall with the largest area are second sub-walls, and a second portion is provided between the second sub-wall and the electrode assembly.

[0020] In one embodiment, the second portion provided between the second sub-wall and the electrode assembly is a second target portion; the outer contour of the orthographic projection of the electrode assembly on the second sub-wall is within the outer contour range of the orthographic projection of the second target portion on the second sub-wall; and / or

[0021] The second portion is arranged between the second sub-wall and the electrode assembly and is attached to the second sub-wall.

[0022] In one embodiment, a first groove is provided on the first wall, and at least a portion of the first portion is accommodated in the first groove; and / or

[0023] A second groove is provided on the second wall. When there is a second portion provided between the electrode assembly and the second wall among all the second portions, at least a portion of the second portion is accommodated in the second groove.

[0024] In a second aspect, an embodiment of the present application provides a battery, comprising a battery cell in any of the above embodiments.

[0025] In one embodiment, the battery further includes a thermal management component;

[0026] Wherein, the heat management component is arranged on a side of the first wall away from the accommodating cavity; or

[0027] Among all the second parts, there is a second part disposed between the electrode assembly and the second wall, and the heat management component is disposed on a side of the second wall facing away from the accommodating cavity.

[0028] In the above-mentioned battery cell and battery, the battery cell includes an outer shell, an electrode assembly, and a heat pipe. The outer shell includes a shell and an end cap. The shell includes a first wall and a second wall surrounding the periphery of the first wall. The first wall and the second wall together define a receiving cavity and an opening connected to the receiving cavity. The heat pipe includes a first portion and at least a second portion. By arranging the first portion on the first wall, heat can be transferred and exchanged between the first portion and the first wall. The second portion is connected to the first portion and extends along the direction away from the first wall from the first portion. In this way, heat can be quickly transferred and exchanged between the second portion and the first portion. Among all second portions, there is a second portion arranged between the electrode assembly and the second wall. In this way, heat can be quickly transferred and exchanged between the second wall and the electrode assembly through the second portion. There are multiple electrode assemblies, and among all second portions, there is a second portion arranged between two adjacent electrode assemblies. In this way, heat can be quickly exchanged between the two electrode assemblies, effectively managing and regulating the temperature of the two electrode assemblies. All the second parts include a second part located between the electrode assembly and the second wall and a second part located between two adjacent electrode assemblies. In this way, while heat can be quickly transferred and exchanged between the second wall and the electrode assembly through the second part, heat can also be quickly exchanged between the two electrode assemblies. In the above process, since the heat pipe can quickly transfer a large amount of heat under a small temperature difference, when the temperature of the battery cell is too high, the heat of the electrode assembly can be quickly absorbed, and the heat can be quickly transferred to the shell and then dissipated to the outside of the battery cell. When the temperature of the battery cell is too low, the heat transferred from the outside to the shell can be quickly absorbed and the heat can be quickly transferred to the electrode assembly. Therefore, the battery cell provided in the embodiment of the present application can improve the safety performance of the battery cell while improving the performance of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic structural diagram of a battery cell provided in some embodiments of the present application.

[0030] Figure 2 for Figure 1 Schematic diagram of a top view of a battery cell.

[0031] Figure 3 for Figure 2 Schematic diagram of the cross section of the battery cell at AA.

[0032] Figure 4 for Figure 1 Schematic diagram of the exploded structure of the battery cell.

[0033] Figure 5 for Figure 3 A partial enlarged view of point C in the middle.

[0034] Figure 6A schematic diagram of the three-dimensional structure of a heat pipe in a battery cell provided in some embodiments of the present application.

[0035] Figure 7 This is a schematic diagram of the internal structure principle of the heat pipe in some embodiments of the present application.

[0036] Figure 8 Schematic diagram of the three-dimensional structure of the heat pipe in the battery cell provided in some other embodiments of the present application.

[0037] Figure 9 Schematic diagram of the three-dimensional structure of the heat pipe in the battery cell provided in some other embodiments of the present application.

[0038] Figure 10 Schematic diagram of the three-dimensional structure of the heat pipe in the battery cell provided in some other embodiments of the present application.

[0039] Figure 11 for Figure 6 The three-dimensional structure diagram when multiple heat pipes are provided is shown in FIG.

[0040] Figure 12 Schematic diagram of the outer contours of the electrode assembly and the heat pipe on the reference surface S.

[0041] Figure 13 for Figure 1 Schematic diagram of the internal structure of the battery cell shell.

[0042] Figure 14 for Figure 1 Schematic diagram of a top view of a battery cell from another angle.

[0043] Figure 15 for Figure 14 Schematic diagram of the cross-section of the battery cell at BB.

[0044] The accompanying drawings in the specific implementation manner are as follows:

[0045] 100, battery cell; 1, outer shell; 11, housing; 12, end cap; B1, first wall; A1, first groove; B2, second wall; A2, second groove; Z1, sub-wall; Z11, first sub-wall; Z12, second sub-wall; R, accommodating chamber; 2, electrode assembly; 3, heat pipe; 31, first part; 32, second part; M1, first target part; M2, second target part; u, opening; Q, steam; X, wick; Y, liquid working medium; R1, heat absorbing end; L1, condensing end; R2, adiabatic end; K, shell; DM, electric Core blue film; P1, negative electrode adapter; P2, positive electrode adapter; J2, positive electrode ear; J1, negative electrode ear; DZ, top bracket; DT, top patch; FJ, negative electrode post; FJ1, copper negative electrode post; FJ2, aluminum negative electrode post; ZJ, positive electrode post; ZJ1, copper positive electrode post; ZJ2, aluminum positive electrode post; B1, explosion-proof patch; F, explosion-proof valve; B2, explosion-proof valve patch; T, insulating sleeve; E, QR code logo; N, sealing ring; F1, first direction; F2, second direction; F3, opening direction of opening u; S, reference surface. DETAILED DESCRIPTION

[0046] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0047] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0048] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0049] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0050] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0051] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0052] See Figures 1 to 3 , Figure 1 This is a schematic structural diagram of a battery cell 100 provided in some embodiments of the present application. Figure 2 for Figure 1 A schematic top view of a battery cell 100 is shown in FIG. Figure 3 for Figure 2 A schematic cross-sectional view of the battery cell 100 at AA.

[0053] The housing 1 includes a shell 11 and an end cap 12. The shell 11 includes a first wall B1 and a second wall B2 surrounding the periphery of the first wall B1. The orientation of the first wall B1 and the second wall B2 is not limited herein. The first wall B1 can be the bottom wall or side wall of the shell 11. The opening u and the first wall B1 are arranged opposite to each other, and the end cap 12 is sealed at the opening u. The accommodating chamber R can be opened or closed by opening and closing the end cap 12. The electrode assembly 2 and the heat pipe 3 are both arranged in the accommodating chamber R.

[0054] A battery cell 100 is the smallest unit that makes up a battery module or battery pack, and is also the smallest unit that makes up a battery. In this application, the battery cell 100 may include a lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., and the embodiments of this application are not limited thereto.

[0055] Continue reading Figures 1 to 3 The end cap 12 is a component that fits over the opening u of the housing 11 to isolate the internal environment of the battery cell 100 from the external environment. The shape of the end cap 12 can be adapted to the shape of the housing 11 to fit the housing 11. Optionally, the end cap 12 can be made of a material with a certain degree of hardness and strength (such as an aluminum alloy). This makes the end cap 12 less susceptible to deformation during compression and collision, thereby providing the battery cell 100 with greater structural strength and improved safety.

[0056] Continue reading Figures 1 to 3 , and refer to Figure 4 , Figure 4 for Figure 1 Schematic diagram of the exploded structure of a battery cell in FIG. Battery cell 100 includes multiple components (copper positive electrode ZJ1, aluminum positive electrode ZJ2, copper negative electrode FJ1, and aluminum negative electrode FJ for current conduction; explosion-proof valve F for pressure relief; top bracket DZ for supporting end cap 12; top patch DT for insulating and sealing end cap 12, etc.). Explosion-proof valve F includes explosion-proof valve patch B2 and explosion-proof patch B1. The design of explosion-proof valve patch B2 typically includes holes or grooves around the edge of explosion-proof valve F to maintain pressure balance inside and outside explosion-proof valve F, thereby protecting the valve F.

[0057] When the internal pressure of the battery cell 100 exceeds the safety limit due to overcharging, over-discharging, short circuiting, or external impact, the explosion-proof patch B1 will rupture, thereby releasing the pressure and preventing the shell 11 from bursting. In addition, the battery cell 100 also includes an insulating sleeve T and a sealing ring N. In some embodiments, the insulating sleeve T is made of an insulating material resistant to electrolyte corrosion, such as polystyrene (PS), polypropylene (PP), polyethylene (PE), polyester (PET), polyvinyl chloride (PVC), polyimide (PI), acrylonitrile butadiene styrene plastic (ABS), polycarbonate (PC), polyamide (PA), etc. In some embodiments, the sealing ring N is provided between the end cap 12 and the shell 11 to provide a good seal.

[0058] The electrode assembly 2 is a component in the battery cell 100 where electrochemical reactions occur. One or more electrode assemblies 2 may be contained in the shell 11. The electrode assembly 2 is mainly formed by winding or stacking positive and negative electrode sheets. The electrode assembly 2 also includes a positive electrode tab J2 and a negative electrode tab J1. The battery cell 100 may also include a positive electrode adapter P2 and a negative electrode adapter P1. The positive electrode adapter P2 is used to connect the positive electrode column ZJ and the positive electrode tab J2, and the negative electrode adapter P1 is used to connect the negative electrode column FJ and the negative electrode tab J1, so that the electrical energy generated by the electrode assembly 2 can be transferred to the positive electrode column ZJ and the negative electrode column FJ and output.

[0059] The battery cell 100 also includes a blue protective film (DM) on the outer surface of the housing 11. This film protects the battery cell 100 from scratches and abrasion during transportation, storage, and assembly. Furthermore, a QR code E can be provided on the end cap 12, allowing you to scan the QR code to obtain detailed information about the battery cell 100.

[0060] Continue reading Figures 1 to 4 , and combined with reference Figure 5 , Figure 5 for Figure 3 The heat pipe 3 is a highly efficient heat conduction structure that can quickly transfer a large amount of heat under a small temperature difference. The shape of the shell 11 can be rectangular, cylindrical, flat, etc. For the convenience of explanation, the following description will take the shape of the shell 11 as a rectangular parallelepiped. Please refer to Figure 6, which is a schematic diagram of the three-dimensional structure of the heat pipe in the battery cell provided by some embodiments of the present application. The shape of the heat pipe 3 is plate-shaped, and the shape of the shell 11 is rectangular. The plate-shaped structure is easy to process and shape, which reduces the manufacturing cost, and the plate-shaped heat pipe 3 can be more conveniently installed in the accommodating cavity R of the rectangular shell 11. The shape of the heat pipe can be adapted according to the shape of the shell 11. For example, when the shape of the shell 11 is cylindrical, the outer surface of the heat pipe can also be adapted to the shape of the shell 11 and set to be a cylindrical surface. Combined with reference Figure 7 , Figure 7 This is a schematic diagram of the internal structure of a heat pipe in some embodiments of the present application. When the heat pipe 3 needs to be heated, the air inside the shell K is evacuated to form a vacuum inside the tube, and the shell K is filled with a working medium Y. The heat pipe 3 is divided into a heat-absorbing end R1, a condensing end L1, and an insulating end R2. The working medium Y outside the shell K flows into the heat-absorbing end R1, where it absorbs heat and its temperature rises, turning into vapor Q. Driven by gas diffusion, the vapor Q flows from the heat-absorbing end R1 to the condensing end L1. This process relies on the pressure difference within the heat pipe 3 and capillary action.

[0061] When heat pipe 3 needs to cool down, steam Q at condensation end L1 contacts a cooler surface, losing heat and condensing into a liquid state. Finally, liquid working fluid Y returns to heat absorption end R1 through the capillary action of wick X within the pipe, achieving the desired heat transfer effect through this continuous cycle.

[0062] Among them, continue to refer to Figure 7 The arrow pointing from the outside to the shell K at the heat absorption end R1 represents the transfer of heat from the outside to the shell. Similarly, the arrow pointing from the shell K to the outside at the condensation end represents the dissipation of heat from the shell to the outside. The arrow pointing from the heat absorption end R1 to the condensation end L1 within the shell K represents the path of the working fluid Y flowing into the heat absorption end R1, which absorbs heat and rises in temperature, and turns into vapor Q. The path of vapor Q is driven by gas diffusion. The arrow pointing from the condensation end L1 to the heat absorption end R1 within the shell K represents the path of the liquid working fluid Y returning to the heat absorption end R1 through the capillary action of the liquid wick X within the tube.

[0063] The heat pipe 3 includes a first portion 31 and at least one second portion 32. Since the first portion 31 is arranged on the first wall B1, heat can be quickly transferred between the first portion 31 and the first wall B1. The heat flow pattern is that it is transferred from an object with high heat to an object with low heat. By connecting the second portion 32 to the first portion 31 and extending it in a direction away from the first wall B1 along the first portion 31, heat can be transferred between the first portion 31 and the second portion 32. It is understandable that there are many directions away from the first wall B1, which are not limited here.

[0064] Among all the second portions 32, there is a second portion 32 disposed between the electrode assembly 2 and the second wall B2. "Disposed between" means that at least one of the second portions 32 is disposed between the electrode assembly 2 and the second wall B2. When multiple second portions 32 are provided, in addition to the second portion 32 disposed between the electrode assembly 2 and the second wall B2, other second portions 32 may be disposed at other locations.

[0065] In this way, by arranging the second part 32 between the electrode assembly 2 and the second wall B2, heat can be quickly transferred between the electrode assembly 2 and the second part 32, and heat can be quickly transferred between the second part 32 and the second wall B2, thereby effectively managing the temperature of the electrode assembly 2.

[0066] Reference Figure 6 In the first embodiment, the heat pipe 3 has a generally U-shaped structure formed by the first portion 31 and the second portion 32. The first portion 31 extends in the first direction F1, and the two second portions 32 extend in the third direction F3. The second portions 32 are disposed at both ends of the first portion 31 in the first direction F1. The two second portions 32 can respectively engage with the inner surfaces of the two second walls B2 facing each other in the first direction F1, facing the accommodating cavity R.

[0067] You can also refer to Figure 8 , Figure 8 Schematic diagrams of the three-dimensional structure of heat pipes in battery cells according to other embodiments of the present application. In the second embodiment, the first portion of the heat pipe 3 extends in the second direction F2, and the two second portions 32 extend in the third direction F3. The second portions 32 are arranged at opposite ends of the first portion 31 in the second direction F2. The two second portions 32 can respectively mate with the inner surfaces of the two second walls B2 facing each other in the second direction F2, facing the accommodating cavity R.

[0068] The shape of the housing 11 is a rectangular parallelepiped, and the length direction is parallel to the second direction F2, the opening direction F3 of the opening u is parallel to the height direction, and the first direction F1 is parallel to the width direction. Figure 8 When the structure of the heat pipe 3 is configured, the heat exchange area between the heat pipe 3 and the first wall B1 can be effectively increased, and the heat exchange area between the heat pipe 3 and the second wall B2 can also be effectively increased.

[0069] When there are multiple electrode assemblies 2 , among all the second portions 32 , there is a second portion 32 located between two adjacent electrode assemblies 2 .

[0070] Please refer to Figure 9 , Figure 9Schematic diagram of the three-dimensional structure of the heat pipe in the battery cell provided for some other embodiments of the present application. In the third case, the first part 31 in the heat pipe 3 extends in the second direction F2, and the second part 32 extends in the opening direction F3 of the opening u, and the second part 32 is connected to the middle part of the first part 31. When this heat pipe 3 is placed in the accommodating cavity R, the first part 31 can fit as much as possible with the first wall B1, and the accommodating cavity R is divided into two accommodating spaces in the second direction F2, and the two accommodating spaces can be used to accommodate two electrode assemblies 2. Of course, multiple second parts 32 can also be arranged at intervals in the second direction F2 to divide more accommodating spaces to accommodate more electrode assemblies 2.

[0071] By arranging the second part 32 between two adjacent electrode assemblies 2, heat can be quickly transferred between the second part 32 and one of the electrode assemblies 2, and heat can also be quickly transferred between the second part 32 and the other electrode assembly 2, thereby achieving rapid heat transfer between the two electrode assemblies 2 and effectively managing and regulating the temperature of the two electrode assemblies 2.

[0072] When there are multiple electrode assemblies 2 , among all the second portions 32 , there are second portions 32 located between two adjacent electrode assemblies 2 and second portions 32 located between the electrode assembly 2 and the second wall B2 .

[0073] Please refer to Figure 10 , Figure 10 Schematic diagrams of the three-dimensional structure of heat pipes in battery cells provided in other embodiments of the present application. In the fourth embodiment, the heat pipe 3 has a first portion 31 extending in the second direction F2, and a second portion 32 extending in the direction F3 of the opening u. There is not only a second portion 32 connected to the middle of the first portion 31, but also a second portion 32 connected to both ends of the first portion 31 in the second direction F2. This configuration combines the advantages of both the second and third embodiments described above, and will not be further elaborated here.

[0074] In the above-mentioned various situations, when the electrode assembly 2 generates a large amount of heat, the heat transfer path may include: a first path, the electrode assembly 2 can transfer the heat from the electrode assembly 2 to the first part 31, and then quickly transfer the heat from the first part 31 to the first wall B1; a second path, the electrode assembly 2 can also quickly transfer the heat to the second part 32, and the second part 32 located between the electrode assembly 2 and the second wall B2 can quickly transfer the heat to the second wall B2, so that the electrode assembly 2 quickly dissipates heat; a third path, the second part 32 located between two adjacent electrode assemblies 2 This allows heat to be transferred between the two electrode assemblies 2, effectively managing and regulating their temperatures. A fourth path involves heat being transferred from the electrode assembly 2 to the first portion 31, and then from the first portion 31 to the second portion 32. The second portion 32, located between the electrode assembly 2 and the second wall B2, can quickly conduct the heat to the second wall B2. A fifth path involves heat being transferred from the electrode assembly 2 to the first portion 31, and then from the first portion 31 to the second portion 32. The second portion 32, located between two adjacent electrode assemblies 2, can transfer heat between the two electrode assemblies 2. This improves the heat dissipation performance of the battery cell 100.

[0075] In the first case, the battery cell 100 has a first path, a second path, and a fourth path. In the second case, the battery cell 100 has a first path, a second path, and a fourth path. In the third case, the battery cell 100 has a first path, a third path, and a fifth path. In the fourth case, the battery cell 100 has a first path, a second path, a third path, a fourth path, and a fifth path.

[0076] In cold climates, the temperature of the battery cell 100 will decrease, which may affect the capacity and output performance of the battery cell 100. In this case, when the electrode assembly 2 needs to be heated quickly, the heat transfer path is opposite to the path that the battery cell 100 needs to dissipate heat, which can speed up the heating of the electrode assembly 2. This will not be elaborated here.

[0077] In this way, the battery cell 100 can dissipate heat and heat quickly, thereby improving the thermal management performance of the battery cell 100 .

[0078] In some embodiments of this application, please continue to refer to Figure 1 and Figure 6The second wall B2 includes a plurality of sub-walls Z1 sequentially arranged around the periphery of the first wall B1 and sequentially connected. The plurality of sub-walls Z1 include two first sub-walls Z11 arranged opposite each other along a first direction F1. The two first sub-walls Z11 are the largest in area among the plurality of sub-walls Z1. The first direction F1 is perpendicular to the direction F3 of the opening u. Among all second portions 32, there is a second portion 32 located between the two first sub-walls Z11 and the electrode assembly 2.

[0079] Please refer to Figure 6 , Figure 6 The structure of the heat pipe 3 in FIG. 1 is the same as that in the first case described above. Its plate-like structure maximizes the heat exchange area with the housing 11, improving heat transfer efficiency. Furthermore, the plate-like structure allows the heat pipe 3 to occupy less space in the housing cavity R, allowing it to accommodate a larger electrode assembly 2.

[0080] The second part 32 is arranged between the first sub-wall Z11 and the electrode assembly 2. When heat needs to be quickly dissipated from the electrode assembly 2 to the outside, the heat will be quickly transferred from the electrode assembly 2 to the second part 32. Since the first sub-wall Z11 is the wall with the largest area among the multiple sub-walls Z1, the heat conduction area between the first sub-wall Z11 and the second part 32 is the largest, which can further improve the rate of heat transfer from the electrode assembly 2 to the first sub-wall Z11. According to the Stefan-Boltzmann law, the thermal radiation power is proportional to the surface area of ​​the object, and the first sub-wall Z11 has the strongest ability to emit and absorb thermal radiation.

[0081] It is understandable that, see Figure 6 When the shell 11 is in the shape of a cuboid, there are two first sub-walls Z11 arranged opposite to each other in the first direction F1 among the multiple sub-walls Z1. When the shell 11 is in the shape of a cylinder, the first sub-wall Z11 is the side surface of the cylinder.

[0082] In some embodiments of this application, please continue to refer to Figure 6 The second portion 32 disposed between the two first sub-walls Z11 and the electrode assembly 2 is the first target portion M1. The two first target portions M1 are respectively disposed at both ends of the first portion 31 along the first direction F1, and the second portion 32 is attached to the corresponding first sub-wall Z11.

[0083] In this way, the space enclosed by the two first target portions M1 and the first portion 31 is maximized. By placing the two first target portions M1 at both ends of the first portion 31 along the first direction F1, and by affixing the second portion 32 to the first sub-wall Z11 to eliminate any gaps between them, the space enclosed by the two first target portions M1 and the first portion 31 is further expanded. This, in turn, allows for the accommodation of a larger electrode assembly 2, optimizing the space utilization of the battery cell 100.

[0084] The second portion 32 is in contact with the first sub-wall Z11, and the contact area between them is relatively large. Heat conduction relies on heat transfer through the contact surface, so a larger contact area can transfer more heat, further improving the efficiency of heat transfer and thus the thermal management performance of the battery cell 100.

[0085] Obviously, in some other embodiments, the second part 32 may not be arranged at the two ends of the first part 31 in the first direction F1, but may be arranged in the middle part of the first part 31. Compared with the second part 32 not being arranged at the two ends of the first part 31 in the first direction F1, the two second parts 32 being arranged at the two ends of the first part 31 in the first direction F1 can make the space formed by the first part 31 and the second part 32 larger, and can accommodate an electrode assembly 2 of a larger volume.

[0086] In some other embodiments, a gap may exist between the second portion 32 and the first sub-wall Z11 to transfer heat through thermal radiation or convection. Compared to the presence of a gap, when the components are closely placed, the gap is reduced, reducing the contact thermal resistance and making it easier for heat to transfer across the contact surface.

[0087] In some embodiments of this application, please continue to refer to Figure 11 , Figure 11 for Figure 1 Schematic diagram of the three-dimensional structure of the first embodiment of the heat pipe 3 in the battery cell 100 when multiple heat pipes 3 are provided. The heat pipes 3 are provided in plurality and arranged in sequence along the second direction F2. The first direction F1, the second direction F2, and the direction F3 of the opening u are perpendicular to each other.

[0088] In this way, the rate of heat transfer can be further improved. Multiple heat pipes 3 are arranged in sequence in the second direction F2, and the first direction F1, the second direction F2, and the direction F3 in which the opening u is opened are perpendicular to each other. The first sub-wall Z11 is relatively arranged in the first direction F1, so that more heat pipes 3 are located between the first wall B1 and the electrode assembly 2, and more heat pipes 3 can be arranged between the first sub-wall Z11 and the electrode assembly 2, further improving the heat transfer rate between the electrode assembly 2 and the housing 11.

[0089] In some embodiments of this application, see Figure 12 , Figure 12 Schematic diagram of the outer contours of the orthographic projections of the electrode assembly and heat pipes on the reference plane S. The outer contour of the orthographic projection of the electrode assembly 2 on the reference plane S is within the outer contours of the orthographic projections of all heat pipes 3 on the reference plane S. The reference plane S is a plane perpendicular to the first direction F1.

[0090] In this way, as much of the outer surface of the electrode assembly 2 as possible can be surrounded or covered by the heat pipe 3, so that the heat pipe 3 can exchange heat with more parts of the outer surface of the electrode assembly 2, thereby further improving the heat transfer rate between the electrode assembly 2 and the housing 11.

[0091] In some embodiments of this application, see Figure 6 and Figure 8 The second wall B2 includes a plurality of sub-walls Z1 sequentially arranged around the periphery of the first wall B1 and sequentially connected. Except for the wall with the largest area, the remaining sub-walls Z1 are second sub-walls Z12. A second portion 32 is provided between the second sub-wall Z12 and the electrode assembly 2.

[0092] Thus, the second portion 32 is provided between the second sub-wall Z12 and the electrode assembly 2, enabling rapid heat transfer between the second sub-wall Z12 and the second portion 32, as well as between the electrode assembly 2 and the second portion 32. This allows for rapid heat transfer between the electrode assembly 2 and the second sub-wall Z12, further enhancing the overall thermal management performance of the battery cell 100.

[0093] In some embodiments of this application, see Figure 6 and Figure 8 , the second part 32 set between the second sub-wall Z12 and the electrode assembly 2 is the second target part M2; the outer contour of the orthographic projection of the electrode assembly 2 on the second sub-wall Z12 is located within the outer contour range of the orthographic projection of the second target part M2 on the second sub-wall Z12; and / or, the second part 32 set between the second sub-wall Z12 and the electrode assembly 2 is attached to the second sub-wall Z12.

[0094] In this way, by setting the second portion 32 provided between the second sub-wall Z12 and the electrode assembly 2 as the second target portion M2, the outer contour of the orthographic projection of the electrode assembly 2 on the second sub-wall Z12 is located within the outer contour range of the orthographic projection of the second target portion M2 on the second sub-wall Z12. This ensures that as much of the outer surface of the electrode assembly 2 as possible can be surrounded or covered by the heat pipe 3, allowing the heat pipe 3 to exchange heat with more parts of the outer surface of the electrode assembly 2. This further improves the heat transfer rate between the electrode assembly 2 and the housing 11.

[0095] By disposing the second portion 32 between the second sub-wall Z12 and the electrode assembly 2, and by placing the second portion 32 in close contact with the second sub-wall Z12, the gap is reduced when the second portion 32 is in close contact with the second sub-wall Z12, thereby reducing the contact thermal resistance, making it easier for heat to be transferred through the contact surface, and improving the heat transfer rate between the second portion 32 and the second sub-wall Z12.

[0096] The second part 32 arranged between the second sub-wall Z12 and the electrode assembly 2 is the second target part M2. The outer contour of the positive projection of the electrode assembly 2 on the second sub-wall Z12 is located within the outer contour range of the positive projection of the second target part M2 on the second sub-wall Z12. At the same time, the second part 32 is arranged between the second sub-wall Z12 and the electrode assembly 2, and the second part 32 is attached to the second sub-wall Z12. This not only enables the heat pipe 3 to exchange heat with more parts of the outer surface of the electrode assembly 2, but also reduces the gap between the second part 32 and the second sub-wall Z12, thereby reducing the contact thermal resistance, making it easier for heat to be transferred through the contact surface, and improving the thermal management performance of the battery cell 100.

[0097] In some embodiments of this application, please continue to refer to Figure 13 , Figure 13 for Figure 1 Schematic diagram of the internal structure of the housing 11 of a battery cell 100. A first recess A1 is defined on the first wall B1, into which at least a portion of the first portion 31 is accommodated; and / or a second recess A2 is defined on the second wall B2, into which at least a portion of the second portion 32 is accommodated, if any of the second portions 32 is located between the electrode assembly 2 and the second wall B2.

[0098] The phrase "at least a portion of the first portion 31 is accommodated in the first groove A1" means that at least a portion of the first portion 31 is accommodated in the first groove A1, and also includes the phrase "at least a portion of the second portion 32 is accommodated in the second groove A2" means that at least a portion of the second portion 32 is accommodated in the second groove A2, and also includes the phrase "at least a portion of the second portion 32 is accommodated in the second groove A2".

[0099] By providing the first groove A1 on the first wall B1 and at least partially housing the first portion 31 within the first groove A1, the space in the accommodating chamber R can be expanded, optimizing the space utilization of the battery cell 100. When the first portion 31 is fully housed within the first groove A1, space utilization is maximized. Furthermore, the first groove A1 facilitates mounting the first portion 31 to the first wall B1 of the housing 11. This arrangement also prevents the first portion 31 from shaking during use of the battery cell 100, reducing the risk of displacement of the first portion 31.

[0100] You can continue to refer to Figure 13 Combined with reference Figure 6 , the first target portion M1 is installed in conjunction with the second groove A2, and the first portion 31 is installed in conjunction with the first groove A1. Figure 8 , the second target portion M2 is installed in conjunction with the second groove A2, and the first portion 31 is installed in conjunction with the first groove A1. Figure 9 The first portion 31 is installed in cooperation with the first groove A1.

[0101] Similarly, a second groove A2 is provided on the second wall B2. If a second portion 32 located between the electrode assembly 2 and the second wall B2 is present among all the second portions 32, at least a portion of the second portion 32 is accommodated within the second groove A2. This allows for a larger space in the accommodating chamber R, optimizing the space utilization of the battery cell 100. When the second portion 32 is entirely accommodated within the second groove A2, space utilization is maximized. Furthermore, the provision of the second groove A2 facilitates mounting the second portion 32 on the second wall B2 of the housing 11. This arrangement also prevents the second portion 32 from shaking during use of the battery cell 100, reducing the risk of displacement of the second portion 32.

[0102] Alternatively, a first groove A1 may be provided on the first wall B1, with at least a portion of the first portion 31 accommodated within the first groove A1. Furthermore, a second groove A2 may be provided on the second wall B2. If, among all the second portions 32, there is a second portion 32 located between the electrode assembly 2 and the second wall B2, at least a portion of the second portion 32 is accommodated within the second groove A2. This further improves the space utilization of the battery cell 100.

[0103] In addition, you can refer to Figure 14 and Figure 15 , Figure 14 for Figure 1 Schematic diagram of a top view of the battery cell 100 from another angle. Figure 15 for Figure 14 The cross-sectional view of the battery cell 100 at position BB in FIG. more clearly shows the specific structure of the battery cell 100 of the present application.

[0104] According to some embodiments of the present application, a battery is provided, comprising the battery cell 100 of any of the above embodiments. In the technical solution of the embodiments of the present application, since the battery comprises the battery cell 100 of any of the above embodiments, it also has the advantages of any of the above embodiments.

[0105] In some embodiments, the battery further includes a thermal management component, wherein the "thermal management component" refers to a component that can manage and regulate the temperature of the battery cell 100. The thermal management component can accommodate a fluid to manage and regulate the temperature of the battery cell 100. The fluid here can be a liquid or a gas. Temperature management and regulation can include heating or cooling the battery cell 100. The thermal management component is arranged on the side of the first wall B1 away from the accommodating chamber R. When the battery cell 100 needs to be heated, the thermal management component can transfer heat to the first wall B1 outside the accommodating chamber R, and then transfer the heat to the inside of the accommodating chamber R through the first wall B1, thereby achieving rapid heating of the battery cell 100. Similarly, when the battery cell 100 needs to be cooled, the thermal management component can be a cold storage plate, which can transfer cold energy to the second wall B2 outside the accommodating chamber R, and then transfer the cold energy to the inside of the accommodating chamber R through the second wall B2, thereby achieving rapid cooling of the battery cell 100.

[0106] Alternatively, among all the second parts 32, there is a second part 32 located between the electrode assembly 2 and the second wall B2, and the thermal management component is located on the side of the second wall B2 facing away from the accommodating chamber R. Here, "there is a second part 32 among all the second parts 32" means that a part of the second part 32 is located between the electrode assembly 2 and the second wall B2, and there may also be a second part 32 located in other positions, which is not limited here. In this way, when the battery cell 100 needs to be heated, the thermal management component can transfer heat to the second wall B2 outside the accommodating chamber R, and then transfer the heat to the inside of the accommodating chamber R through the second wall B2, thereby achieving rapid heating of the battery cell 100. Similarly, when the battery cell 100 needs to be cooled, the thermal management component can transfer cold energy to the second wall B2 outside the accommodating chamber R, and then transfer the cold energy to the inside of the accommodating chamber R through the second wall B2, thereby achieving rapid cooling of the battery cell 100.

[0107] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0108] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A battery cell, characterized in that: include: The housing comprises a shell and an end cover, wherein the shell comprises a first wall and a second wall arranged around the periphery of the first wall, the first wall and the second wall defining a receiving cavity and an opening communicating with the receiving cavity, the opening being arranged opposite to the first wall, and the end cover sealing the opening; an electrode assembly, disposed in the accommodating cavity; and a heat pipe disposed in the accommodating cavity; the heat pipe comprising a first portion and at least one second portion, the first portion being disposed on the first wall, the second portion being connected to the first portion and extending along the first portion in a direction away from the first wall; wherein among all the second portions, there is a second portion located between the electrode assembly and the second wall; and / or There are a plurality of electrode assemblies, and among all the second portions, there is a second portion located between two adjacent electrode assemblies.

2. The battery cell according to claim 1, wherein: The second wall includes a plurality of sub-walls sequentially arranged around the periphery of the first wall and sequentially connected; The plurality of sub-walls include two first sub-walls arranged opposite to each other along a first direction, the two first sub-walls being the walls with the largest areas among the plurality of sub-walls; the first direction is perpendicular to the opening direction of the opening; Among all the second portions, there is a second portion located between two of the first sub-walls and the electrode assembly.

3. The battery cell according to claim 2, characterized in that: a second portion provided between the two first sub-walls and the electrode assembly as a first target portion; The two first target portions are respectively arranged at two ends of the first portion along the first direction, and the second portion is attached to the corresponding first sub-wall.

4. The battery cell according to claim 3, characterized in that There are multiple heat pipes, and the multiple heat pipes are arranged in sequence along the second direction; The first direction, the second direction, and the direction in which the opening is opened are perpendicular to each other.

5. The battery cell according to claim 4, characterized in that The outer contour of the orthographic projection of the electrode assembly on the reference surface is located within the outer contour range of the orthographic projection of all the heat pipes on the reference surface; the reference surface is a plane perpendicular to the first direction.

6. The battery cell according to claim 1, characterized in that The second wall includes a plurality of sub-walls sequentially arranged around the periphery of the first wall and sequentially connected; The remaining walls among the plurality of sub-walls except the wall with the largest area are second sub-walls, and the second portion is provided between the second sub-wall and the electrode assembly.

7. The battery cell according to claim 6, characterized in that The second portion provided between the second sub-wall and the electrode assembly is a second target portion; the outer contour of the orthographic projection of the electrode assembly on the second sub-wall is within the outer contour range of the orthographic projection of the second target portion on the second sub-wall; and / or The second portion disposed between the second sub-wall and the electrode assembly is attached to the second sub-wall.

8. The battery cell according to any one of claims 1 to 7, characterized in that: A first groove is provided on the first wall, and at least a portion of the first portion is accommodated in the first groove; and / or A second groove is provided on the second wall. When there is a second portion provided between the electrode assembly and the second wall among all the second portions, at least a portion of the second portion is accommodated in the second groove.

9. A battery, characterized in that: The battery cell comprises the battery cell according to any one of claims 1 to 8.

10. The battery according to claim 9, characterized in that The battery further includes a thermal management component; Wherein, the heat management component is provided on a side of the first wall away from the accommodating cavity; or Among all the second parts, there is a second part disposed between the electrode assembly and the second wall, and the heat management component is disposed on a side of the second wall away from the accommodating cavity.

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