Battery cell and battery pack

Abstract

This application relates to the field of battery technology and discloses a battery cell and a battery pack. The battery cell has a first direction and includes a housing, an electrode assembly, and an insulating layer. The housing includes a sidewall, a transition corner portion, and a bottom wall connected sequentially along the first direction. The electrode assembly is disposed within the housing. The insulating layer is disposed within the housing and covers a portion of the electrode assembly. A protrusion is provided on the bottom wall near the electrode assembly, and the protrusion abuts against a portion of the insulating layer near the bottom wall along the first direction. A gap is left between the electrode assembly and a portion of the transition corner portion. This solves the technical problem that placing a bottom support plate inside the battery cell would occupy the internal space of the battery and reduce the energy density of the battery.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a battery cell and a battery pack. Background Technology

[0002] As batteries become the core energy supply system for modern electronic devices, their safety, energy storage efficiency, and mechanical strength are directly related to the lifespan of the devices and the user experience.

[0003] In related technologies, during the battery manufacturing process, a base plate is needed to elevate the electrode assembly to prevent interference between the electrode assembly and the bottom chamfer of the casing. However, placing a base plate inside the battery cell will occupy the internal space of the battery and reduce the energy density of the battery. Utility Model Content

[0004] This application provides a battery cell and a battery pack, which solves the technical problem that setting a bottom plate inside the battery cell will occupy the internal space of the battery and reduce the energy density of the battery.

[0005] To achieve the above objectives, the main technical solutions adopted in this application include:

[0006] In a first aspect, embodiments of this application provide a battery cell. The battery cell has a first direction and includes a housing, an electrode assembly, and an insulating layer. The housing includes a side wall, a transition corner portion, and a bottom wall connected sequentially along the first direction. The electrode assembly is disposed within the housing. The insulating layer is disposed within the housing and covers a portion of the electrode assembly. A protrusion is provided on the bottom wall near the electrode assembly. The protrusion protrudes along the first direction and abuts against a portion of the insulating layer near the bottom wall along the first direction. A gap is left between the electrode assembly and a portion of the transition corner portion.

[0007] The battery cell proposed in this application has a protrusion on the bottom wall near the electrode assembly. The protrusion protrudes along a first direction and abuts against the portion of the insulating layer near the bottom wall along the first direction. This can separate the electrode assembly from the bottom wall, improve the heat dissipation efficiency of the electrode assembly, and improve the internal space utilization of the battery cell, reduce the weight of the battery cell, and increase the energy density of the battery cell. On the other hand, it reduces the probability of friction between the insulating layer of the electrode assembly and the shell, and improves the structural stability of the battery cell.

[0008] Optionally, the transition corner portion has an inner wall surface facing the electrode assembly, and the height of the protrusion along the first direction is less than the height of the inner wall surface along the first direction.

[0009] The height of the protrusion along the first direction is less than the height of the inner wall surface along the first direction, which can improve the internal space utilization of the battery cell and increase the energy density of the battery cell.

[0010] Optionally, the battery cell also has a second direction and a third direction, with the first direction, the second direction and the third direction being perpendicular to each other. The sidewall includes two small sidewalls arranged opposite each other along the third direction. The transition corner includes a first corner. The small sidewalls are connected to the bottom wall through the first corner. A gap is left between the two ends of the electrode assembly along the third direction and the first corner.

[0011] Each small sidewall is connected to the bottom wall through a corresponding first corner. The first corner can serve as a transition and reinforcement for the shell, reducing the probability of stress concentration at the connection between the small sidewall and the bottom wall, thereby enhancing the overall structural strength of the shell.

[0012] Optionally, the sidewall also includes two large sidewalls arranged opposite each other along the second direction, and the transition corner portion also includes a second corner portion. The large sidewalls are connected to the bottom wall through the second corner portion, and a gap is left between the two ends of the electrode assembly along the second direction and the second corner portion.

[0013] A gap is left between the two ends of the electrode assembly along the second direction and the second corner, which can prevent the electrode assembly from rubbing against the first corner and the second corner, thereby improving the stability and reliability of the battery cell structure.

[0014] Optionally, the battery cell also has a second direction and a third direction, with the first direction, the second direction and the third direction being perpendicular to each other. The protrusion includes a plurality of first elongated protrusions, which extend along the third direction, and the plurality of first elongated protrusions are spaced apart along the second direction; or along the first direction, the projection of the protrusion on the bottom wall is circular, and the plurality of protrusions are spaced apart along the second direction and the third direction.

[0015] The first elongated protrusion extends along a third direction, and multiple first elongated protrusions are arranged at intervals along a second direction. This provides multi-point support for the support portion, improves the internal space utilization of the battery cell, and enhances the heat dissipation performance of the battery cell.

[0016] Optionally, the battery cell also has a second direction and a third direction, with the first direction, the second direction and the third direction being perpendicular to each other, the second elongated protrusion extending along the second direction, and multiple second elongated protrusions arranged at intervals along the third direction.

[0017] The second elongated protrusion can provide multi-point support for the electrode assembly, reducing single-point stress and improving the stability and reliability of the battery cell operation.

[0018] Optionally, the battery cell also has a second direction and a third direction, with the first direction, the second direction and the third direction being perpendicular to each other. The protrusion includes a plurality of first protrusions and a plurality of second protrusions. Along the third direction, the plurality of first protrusions and the plurality of second protrusions are staggered along the third direction. Each first protrusion is inclined relative to the second direction, and each second protrusion is inclined relative to the second direction. The inclination direction of the first protrusion relative to the second direction is opposite to the inclination direction of the second protrusion relative to the second direction.

[0019] Multiple first protrusions and multiple second protrusions are staggered and spaced apart, which provides multi-point support for the electrode assembly, making the electrode assembly more firmly abut against the protrusions, reducing the probability of the electrode assembly shaking, and reducing the probability of stress concentration.

[0020] Optionally, the end of the protrusion that abuts against the insulating layer is constructed as a first plane, and the first plane is perpendicular to a first direction.

[0021] The end of the protrusion that abuts against the insulating layer is constructed as a first plane, while the electrode assembly abuts against the plane. This reduces the chance of the protrusion scratching the insulating layer or damaging the electrode assembly, and also allows the electrode assembly to be more stably placed inside the battery cell, improving the stability and reliability of the battery cell operation.

[0022] Optionally, at least a portion of two adjacent protrusions are spaced apart, and the battery cell further includes a thermally conductive medium layer that fills the space between any two adjacent protrusions.

[0023] Filling the space between any two adjacent protrusions with a thermally conductive layer not only improves the space utilization rate inside the battery cell, but also helps to dissipate the heat generated during the operation of the battery cell, thereby increasing the service life of the battery cell.

[0024] Secondly, embodiments of this application also propose a battery pack, including any of the battery cells in any of the embodiments of this application.

[0025] The battery pack proposed in this application embodiment has multiple protrusions on the bottom wall near the electrode assembly. Along the first direction, the protrusions abut against the insulating layer. This not only separates the electrode assembly from the bottom wall, improving the heat dissipation efficiency of the electrode assembly, but also improves the internal space utilization of the battery cell, reduces the weight of the battery cell, and increases the energy density of the battery cell. Furthermore, it reduces the probability of friction between the insulating layer of the electrode assembly and the shell, improving the structural stability of the battery cell. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is an exploded structural view of a battery cell provided in an embodiment of this application;

[0028] Figure 2 This is a schematic diagram of the structure of the shell provided in an embodiment of this application;

[0029] Figure 3 A schematic diagram of the structure in which the length direction of the protrusion is parallel to the second direction, provided in an embodiment of this application;

[0030] Figure 4 A schematic diagram showing the structure in which the length direction of the protrusion is parallel to a third direction, as provided in an embodiment of this application;

[0031] Figure 5 A schematic diagram showing the circular orthographic projection of the protrusion on the bottom wall provided in the embodiments of this application;

[0032] Figure 6 A schematic diagram of the structure of the protrusion provided in the embodiments of this application, including a first protrusion and a second protrusion;

[0033] Figure 7 This is a partial enlarged view of the connection between the sidewall and the bottom wall provided in an embodiment of this application;

[0034] Figure 8 A partial cross-sectional view of a battery cell provided in an embodiment of this application;

[0035] Figure 9 for Figure 8 A magnified view of a portion at point A;

[0036] Figure 10 This is a schematic diagram of the structure of the first corner portion provided in an embodiment of this application;

[0037] Figure 11 for Figure 10 A magnified view of the area at point B;

[0038] Figure 12 This is a schematic diagram of the structure of the second corner portion provided in an embodiment of this application;

[0039] Figure 13 for Figure 12 A magnified view of a section at point C.

[0040] [Explanation of Labels in the Attached Image]

[0041] Battery cell 100; casing 110; top cover 111; bottom wall 112; side wall 113; small side wall 114; large side wall 115; electrode assembly 120; insulating layer 122; protrusion 130; first protrusion 131; second protrusion 132; thermally conductive medium layer 140; receiving cavity 150; first elongated protrusion 170; second elongated protrusion 180; first corner 190; second corner 200; transition corner 210; inner wall surface 211; first plane 220; gap 230; first direction X; second direction Y; third direction Z. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0044] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0046] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0047] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0048] As batteries become the core energy supply system for modern electronic devices, their safety, energy storage efficiency, and mechanical strength are directly related to the lifespan of the devices and the user experience.

[0049] A battery cell includes an electrode assembly, an insulating sheet, and a housing. The outer surface of the electrode assembly is provided with an insulating sheet to insulate the electrode assembly from the housing. In related technologies, during the battery manufacturing process, a base plate is used to elevate the electrode assembly to prevent interference between the bottom chamfer of the electrode assembly and the housing, which would affect the insulation effect between the electrode assembly and the housing.

[0050] However, placing a base plate inside the battery cell increases the weight of the battery cell, reduces the usable volume inside the battery cell, occupies internal space, and reduces the energy density of the battery. The base plate can also easily reduce the heat dissipation efficiency of the battery cell.

[0051] In view of this, this application proposes a battery cell with a first direction. The battery cell includes a housing, an electrode assembly, and an insulating layer. The housing includes a side wall, a transition corner portion, and a bottom wall connected sequentially along the first direction. The electrode assembly is disposed inside the housing. The insulating layer is disposed inside the housing and covers a portion of the electrode assembly. A protrusion is provided on the bottom wall near the electrode assembly. The protrusion protrudes along the first direction and abuts against a portion of the insulating layer near the bottom wall along the first direction. A gap is left between the electrode assembly and a portion of the transition corner portion.

[0052] In the above solution, a protrusion is provided on the bottom wall near the electrode assembly. The protrusion protrudes along the first direction and abuts against the portion of the insulating layer near the bottom wall along the first direction. This can separate the electrode assembly from the bottom wall, improve the heat dissipation efficiency of the electrode assembly, and improve the internal space utilization of the battery cell, reduce the weight of the battery cell, and increase the energy density of the battery cell. On the other hand, it reduces the probability of friction between the insulating layer of the electrode assembly and the shell, and improves the stability of the battery cell structure.

[0053] The battery cell disclosed in this application includes a first direction, a second direction, and a third direction. The first direction, the second direction, and the third direction can be perpendicular to each other or perpendicular to each other.

[0054] In some embodiments, the battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0055] In some embodiments, the battery can be a battery pack, which includes a battery housing and individual battery cells, with the individual battery cells or battery modules housed within the battery housing.

[0056] In some embodiments, the battery cell can be a rechargeable battery, which refers to a battery cell that can be recharged after discharge to activate the active materials and continue to be used. The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0057] In some embodiments, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0058] In some embodiments, the battery cell includes, but is not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc.

[0059] In some embodiments, a battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of the battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator is disposed between the positive and negative electrodes to reduce the risk of short circuits between the positive and negative electrodes, while allowing active ions to pass through.

[0060] The battery pack disclosed in this application can be used, but is not limited to, vehicles, and can also be used in other electrical devices with structural beams, wherein the battery pack is able to avoid the structural beams of other electrical devices.

[0061] The battery pack disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft that have longitudinal beams and are designed to allow the battery pack to avoid obstructing these beams. A power system for such an electrical device can be constructed using the battery pack disclosed in this application.

[0062] This application provides an electrical device that uses a battery pack as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric bicycles, electric motorcycles, electric cars, ships, heavy trucks, buses, spacecraft, etc. Among them, electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0063] For ease of explanation, the following embodiments use a single battery cell from one embodiment of this application as an example.

[0064] Figure 1 This is an exploded structural view of a battery cell provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of the shell provided in an embodiment of this application; Figure 3 A schematic diagram of the structure in which the length direction of the protrusion is parallel to the second direction, provided in an embodiment of this application; Figure 4 A schematic diagram showing the structure in which the length direction of the protrusion is parallel to a third direction, as provided in an embodiment of this application; Figure 5 A schematic diagram showing the circular orthographic projection of the protrusion on the bottom wall provided in the embodiments of this application; Figure 6 A schematic diagram of the structure of the protrusion provided in the embodiments of this application, including a first protrusion and a second protrusion; Figure 7 This is a partial enlarged view of the connection between the sidewall and the bottom wall provided in an embodiment of this application; Figure 8 A partial cross-sectional view of a battery cell provided in an embodiment of this application; Figure 9 for Figure 8 A magnified view of a portion at point A; Figure Figure 10 This is a schematic diagram of the structure of the first corner portion provided in an embodiment of this application; Figure 11 for Figure 10 A magnified view of the area at point B; Figure 12 This is a schematic diagram of the structure of the second corner portion provided in an embodiment of this application; Figure 13 for Figure 12 A magnified view of a section at point C.

[0065] Please refer to Figures 1 to 3The battery cell 100 has a first direction X. The battery cell 100 includes a housing 110, an electrode assembly 120, and an insulating layer 122. The housing 110 includes a side wall 113, a transition corner portion 210, and a bottom wall 112 connected sequentially along the first direction X. The electrode assembly 120 is disposed inside the housing 110. The insulating layer 122 is disposed inside the housing 110 and covers a portion of the electrode assembly 120. A plurality of protrusions 130 are provided on the side of the bottom wall 112 near the electrode assembly 120. The protrusions 130 protrude along the first direction X and abut against the portion of the insulating layer 122 near the bottom wall 112 along the first direction X. A gap 230 is left between the electrode assembly 120 and a portion of the transition corner portion 210.

[0066] Sidewalls 113 surround the bottom wall 112. Along the first direction X, one end of sidewall 113 is connected to the bottom wall 112, and the other end of sidewall 113 can be connected to the top cover 111. The top cover 111 and the bottom wall 112 are arranged at both ends of the sidewall 113 to form a receiving cavity 150. Electrode assembly 120 is disposed in the receiving cavity 150. Insulating layer 122 can be disposed between electrode assembly 120 and housing 110, thereby forming insulation between electrode assembly 120 and housing 110. Insulating layer 122 can wrap around the outside of electrode assembly 120, can be attached to the outer surface of electrode assembly 120, and can be disposed between bottom wall 112 and electrode assembly 120.

[0067] The housing 110 also includes a bottom wall 112. Along the first direction X, a protrusion 130 is provided on the side of the bottom wall 112 facing the electrode assembly 120. The protrusion 130 protrudes from the bottom wall 112. An insulating layer 122 is provided on the outer surface of the electrode assembly 120. The protrusion 130 abuts against the insulating layer 122. The electrode assembly 120 does not directly contact the bottom wall 112. There is a certain gap 230 between the electrode assembly 120 and the transition corner portion 210. For example, there can be multiple protrusions 130, which can be spaced apart on the side of the bottom wall 112 facing the electrode assembly 120. This can improve the heat dissipation efficiency of the electrode assembly 120. Moreover, the protrusion 130 can also provide a certain degree of support and fixation for the electrode assembly 120, reducing the probability of displacement of the electrode assembly 120 and ensuring the stability of the battery during operation.

[0068] Compared to setting a bottom tray inside the battery cell 100 to separate the electrode assembly 120 from the bottom wall 112, the protrusion 130 simplifies the manufacturing process of the battery cell 100 and reduces the manufacturing cost of the battery cell 100.

[0069] The protrusion 130 is provided on the side of the bottom wall 112 facing the electrode assembly 120, which can prevent the insulation layer 122 of the electrode assembly 120 from rubbing against the transition corner 210, reduce the probability of the insulation layer 122 being damaged, reduce the probability of leakage of the electrode assembly 120, and improve the stability and reliability of the battery cell 100 operation.

[0070] Specifically, a plurality of protrusions 130 are provided on the side of the bottom wall 112 near the electrode assembly 120. Along the first direction X, the protrusions 130 abut against the insulating layer 122. This can, on the one hand, separate the electrode assembly 120 from the bottom wall 112, thereby improving the heat dissipation efficiency of the electrode assembly 120, and on the other hand, reduce the probability of friction between the insulating layer 122 of the electrode assembly 120 and the housing 110, thereby improving the structural stability of the battery cell 100.

[0071] Furthermore, by providing multiple protrusions 130 within the battery cell 100, the internal space utilization of the battery cell 100 can be improved, increasing the usable volume of the battery cell 100, reducing the internal weight of the battery cell 100, and thereby increasing the energy density of the battery cell 100.

[0072] Please refer to Figures 1 to 11 The transition corner portion 210 has an inner wall surface 211 facing the electrode assembly 120, and the height of the protrusion 130 along the first direction X is less than the height of the inner wall surface 211 along the first direction X.

[0073] For example, the transition corner portion 210 can be constructed as a rounded chamfer portion, the center of which can be located within the receiving cavity 150. The transition corner portion 210 has an inner wall surface 211 facing the receiving cavity 150. A gap 230 is left between the electrode assembly 120 and the inner wall surface 211. The height of the protrusion 130 along the first direction X is less than the height of the inner wall surface 211 along the first direction X. This can improve the internal space utilization of the battery cell 100 and increase the energy density of the battery cell 100.

[0074] Please refer to Figure 1 , Figure 2 , Figure 10 as well as Figure 11 The battery cell 100 has a second direction Y and a third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other. The sidewall 113 includes two small sidewalls 114 arranged opposite each other along the third direction Z. The transition corner 210 includes a first corner 190. The small sidewalls 114 are connected to the bottom wall 112 through the first corner 190. The electrode assembly 120 has a gap 230 between its two ends along the third direction Z and the first corner 190.

[0075] Each small sidewall 114 is connected to the bottom wall 112 through a corresponding first corner portion 190. The first corner portion 190 can play a transition and reinforcement role for the shell 110, reduce the probability of stress concentration at the connection between the small sidewall 114 and the bottom wall 112, and thus enhance the overall structural strength of the shell 110.

[0076] Please refer to Figures 10 to 13 The sidewall 113 also includes two large sidewalls 115 arranged opposite each other along the second direction Y. The transition corner portion 210 also includes a second corner portion 200. The large sidewalls 115 are connected to the bottom wall 112 through the second corner portion 200. A gap 230 is left between the two ends of the electrode assembly 120 along the second direction Y and the second corner portion 200.

[0077] The housing 110 also includes a first corner portion 190 and a second corner portion 200. For example, the first corner portion 190 and the second corner portion 200 can be constructed as curved surfaces. Each small sidewall 114 is connected to the bottom wall 112 through the first corner portion 190, and each large sidewall 115 is connected to the bottom wall 112 through the second corner portion 200. The openings of the first corner portion 190 and the second corner portion 200 are all facing the receiving cavity 150.

[0078] Specifically, each small sidewall 114 is connected to the bottom wall 112 through a corresponding first corner portion 190, and each large sidewall 115 is connected to the bottom wall 112 through a second corner portion 200. The first corner portion 190 and the second corner portion 200 can play a transition and reinforcement role for the shell 110, reduce the probability of stress concentration at the connection between the large sidewall 115 and the bottom wall 112 and the connection between the small sidewall 114 and the bottom wall 112, and thus enhance the overall structural strength of the shell 110.

[0079] A gap 230 is left between the two ends of the electrode assembly 120 along the second direction Y and the second corner portion 200, and a gap 230 is left between the two ends of the electrode assembly 120 along the third direction Z and the first corner portion 190. This can prevent the electrode assembly 120 from rubbing against the first corner portion 190 and the second corner portion 200, thereby improving the stability and reliability of the battery cell 100 structure.

[0080] Please refer to Figures 1 to 6 The battery cell 100 also has a second direction Y and a third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other. The protrusion 130 includes a plurality of first elongated protrusions 170. The first elongated protrusions 170 extend along the third direction Z. The plurality of first elongated protrusions 170 are arranged at intervals along the second direction Y; or along the first direction X, the projection of the protrusion 130 on the bottom wall 112 is circular. The plurality of protrusions 130 are arranged at intervals along the second direction Y and the third direction Z.

[0081] Along the first direction X, the orthographic projection of the protrusion 130 on the bottom wall 112 is circular, that is, the protrusion 130 can be constructed as a cylinder. The cylindrical protrusion 130 has fewer sharp parts, which can reduce the probability of the protrusion 130 scratching the insulation layer 122 or damaging the electrode assembly 120, and improve the stability and reliability of the battery cell 100.

[0082] In addition, the protrusion 130 is cylindrical in shape. Compared with the protrusion 130 with a complex shape, the manufacturing process of the protrusion 130 with a cylindrical shape is simpler, which can reduce the difficulty and cost of production and improve production efficiency.

[0083] The first elongated protrusion 170 extends along the third direction Z, and multiple first elongated protrusions 170 are arranged at intervals along the second direction Y. This can provide more effective support and fixation for the electrode assembly 120. When the battery cell 100 is subjected to external forces in different directions, the multiple first elongated protrusions 170 can disperse the external forces on the electrode assembly 120, reduce the displacement and shaking of the electrode assembly 120 in the receiving cavity 150, and also improve the space utilization of the battery cell 100.

[0084] In addition, multiple first elongated protrusions 170 extend along the third direction Z and are spaced apart along the second direction Y, which can form multiple heat dissipation channels between the electrode assembly 120 and the bottom wall 112. The heat generated by the electrode assembly 120 can be effectively dissipated from the heat dissipation channels, thereby improving the heat dissipation performance of the battery cell 100.

[0085] Please refer to Figure 1 , Figure 2 and Figure 4 In this embodiment, the battery cell 100 also has a second direction Y and a third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other. The protrusion 130 includes a plurality of second elongated protrusions 180. The second elongated protrusions 180 extend along the second direction Y and the plurality of second elongated protrusions 180 are arranged at intervals along the third direction Z.

[0086] The second elongated protrusion 180 extends along the second direction Y, and multiple second elongated protrusions 180 are arranged at intervals along the third direction Z. This can provide more effective support and fixation for the electrode assembly 120. When the battery cell 100 is subjected to external forces in different directions, the multiple second elongated protrusions 180 can disperse the external forces on the electrode assembly 120, reducing the displacement and shaking of the electrode assembly 120 within the receiving cavity 150.

[0087] In addition, multiple second elongated protrusions 180 extend along the second direction Y and are spaced apart along the third direction Z, which can form multiple heat dissipation channels between the electrode assembly 120 and the bottom wall 112. The heat generated by the electrode assembly 120 can be effectively dissipated from the heat dissipation channels, thereby improving the heat dissipation performance of the battery cell 100.

[0088] Please refer to Figure 1 , Figure 2 and Figure 5 In this embodiment, the battery cell 100 also has a second direction Y and a third direction Z. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other. The protrusion 130 includes a plurality of first protrusions 131 and a plurality of second protrusions 132. Along the third direction Z, the plurality of first protrusions 131 and the plurality of second protrusions 132 are staggered along the third direction Z. Each first protrusion 131 is inclined relative to the second direction Y, and each second protrusion 132 is inclined relative to the second direction Y. The inclination direction of the first protrusion 131 relative to the second direction Y is opposite to the inclination direction of the second protrusion 132 relative to the second direction Y.

[0089] For example, the protrusion 130 includes a plurality of first protrusions 131 and a plurality of second protrusions 132. The two ends of the first protrusions 131 are respectively connected to the second protrusions 132. Along the third direction Z, the plurality of first protrusions 131 and the plurality of second protrusions 132 are spaced apart and staggered along the third direction Z. That is, along the third direction Z, they can be arranged in the order of first protrusion 131-second protrusion 132-first protrusion 131, etc.

[0090] Multiple first protrusions 131 and multiple second protrusions 132 are staggered and spaced apart, which can provide multi-point support for the electrode assembly 120, making the electrode assembly 120 more firmly abut against the protrusion 130, reducing the probability of the motor assembly shaking and reducing the probability of stress concentration.

[0091] The inclination direction of the first protrusion 131 relative to the second direction Y is opposite to the inclination direction of the second protrusion 132 relative to the second direction Y. For example, the angle between the length extension direction of the first protrusion 131 and the second direction Y can be -15°, -30°, -45°, -60°, -70°, or -80°, etc. The angle between the length extension direction of the second protrusion and the second direction Y can be 15°, 30°, 45°, 60°, 70°, or 80°, etc.

[0092] Please refer to Figures 1 to 11 In this embodiment, the end of the protrusion 130 that abuts against the insulating layer 122 is constructed as a first plane 220, which is perpendicular to the first direction X.

[0093] The end of the protrusion 130 that abuts against the insulating layer 122 is constructed as a first plane 220, which is perpendicular to the first direction X. The insulating layer 122 can also be constructed as a plane. The plane of the insulating layer 122 abuts against the plane of the protrusion 130. This can reduce the probability of the protrusion 130 scratching the insulating layer 122 or damaging the electrode assembly 120, and improve the stability and reliability of the battery cell 100.

[0094] Please refer to Figures 1 to 11 In this embodiment, a first positioning post is provided on the side of the bottom wall 112 near the electrode assembly 120, and a first positioning hole is provided on the insulating layer 122. The first positioning post is inserted into the first positioning hole.

[0095] For example, there can be multiple first positioning posts and first positioning holes. The first positioning post is inserted into the first positioning hole. On the one hand, the insertion and engagement can limit the movement of the electrode assembly 120 within the receiving cavity 150 to a certain extent, thereby enhancing the overall structural stability of the battery cell 100. On the other hand, the insertion and engagement of the first positioning post and the first positioning hole can also improve the assembly and production efficiency of the battery cell 100.

[0096] Please refer to Figures 1 to 11 In this embodiment, at least a portion of two adjacent protrusions 130 are spaced apart, and the battery cell 100 further includes a thermally conductive medium layer 140, which fills the space between any two adjacent protrusions 130.

[0097] The thermally conductive medium layer 140 is used to dissipate heat generated by the electrode assembly 120. For example, at least a portion of two adjacent protrusions 130 are spaced apart, that is, there is a gap 230 between two adjacent protrusions 130. The battery cell 100 also includes a thermally conductive medium layer 140, which is disposed between the bottom wall 112 and the insulating layer 122 along the first direction X, and fills the gap between any two adjacent protrusions 130. This effectively fills the gap 230 between the protrusions 130, which improves the space utilization inside the battery cell 100 and facilitates the dissipation of heat generated during the operation of the battery cell 100, thereby improving the service life of the battery cell 100.

[0098] This application also proposes a battery pack, which includes a battery cell 100 according to any one of the embodiments of this application.

[0099] The battery pack proposed in this application embodiment has a plurality of protrusions 130 on the side of the bottom wall 112 near the electrode assembly 120. Along the first direction X, the protrusions 130 abut against the insulating layer 122. This can, on the one hand, separate the electrode assembly 120 from the bottom wall 112, improve the heat dissipation efficiency of the electrode assembly 120, and the arrangement of the protrusions 130 can improve the internal space utilization of the battery cell 100, reduce the weight of the battery cell 100, and increase the energy density of the battery cell 100. On the other hand, it reduces the probability of friction between the insulating layer 122 of the electrode assembly 120 and the shell 110, and improves the structural stability of the battery cell 100.

[0100] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0101] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to interchangeably. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0102] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

[0103] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cell, characterized in that, Having a first direction (X), including: The housing (110) includes a sidewall (113), a transition corner portion (210), and a bottom wall (112) connected sequentially along the first direction (X); An electrode assembly (120) is disposed within the housing (110); An insulating layer (122) is disposed within the housing (110) and encloses a portion of the electrode assembly (120); The bottom wall (112) has a protrusion (130) on the side near the electrode assembly (120). The protrusion (130) protrudes along the first direction (X) and abuts against the portion of the insulating layer (122) near the bottom wall (112) along the first direction (X). A gap (230) is left between the electrode assembly (120) and a portion of the transition corner (210).

2. The battery cell according to claim 1, characterized in that, The transition corner portion (210) has an inner wall surface (211) facing the electrode assembly (120), and the height of the protrusion (130) along the first direction (X) is less than the height of the inner wall surface (211) along the first direction (X).

3. The battery cell according to claim 1, characterized in that, The battery cell also has a second direction (Y) and a third direction (Z), the first direction (X), the second direction (Y) and the third direction (Z) are perpendicular to each other, the sidewall (113) includes two small sidewalls (114) arranged opposite to each other along the third direction (Z), the transition corner portion (210) includes two first corner portions (190) arranged opposite to each other along the third direction (Z), the small sidewalls (114) are connected to the bottom wall (112) through the first corner portions (190), and the electrode assembly (120) has a gap (230) between its two ends along the third direction (Z) and the corresponding first corner portions (190).

4. The battery cell according to claim 3, characterized in that, The sidewall (113) further includes two large sidewalls (115) arranged opposite each other along the second direction (Y), and the transition corner portion (210) further includes two second corner portions (200) arranged opposite each other along the second direction (Y). The large sidewalls (115) are connected to the bottom wall (112) through the corresponding second corner portions (200). A gap (230) is left between the two ends of the electrode assembly (120) along the second direction (Y) and the corresponding second corner portions (200).

5. The battery cell according to claim 1, characterized in that, The battery cell also has a second direction (Y) and a third direction (Z), the first direction (X), the second direction (Y) and the third direction (Z) are perpendicular to each other, the protrusion (130) includes a plurality of first elongated protrusions (170), the first elongated protrusions (170) extend along the third direction (Z), and the plurality of first elongated protrusions (170) are arranged at intervals along the second direction (Y); Alternatively, along the first direction (X), the projection of the protrusion (130) onto the bottom wall (112) is circular, and a plurality of the protrusions (130) are arranged at intervals along the third direction (Z) and the second direction (Y).

6. The battery cell according to claim 1, characterized in that, The battery cell also has a second direction (Y) and a third direction (Z), the first direction (X), the second direction (Y) and the third direction (Z) being perpendicular to each other, the protrusion (130) including a plurality of second elongated protrusions (180), the second elongated protrusions (180) extending along the second direction (Y), and the plurality of second elongated protrusions (180) being spaced apart along the third direction (Z).

7. The battery cell according to claim 1, characterized in that, The battery cell also has a second direction (Y) and a third direction (Z), the first direction (X), the second direction (Y) and the third direction (Z) being perpendicular to each other, and the protrusion (130) including a plurality of first protrusions (131) and a plurality of second protrusions (132), which are staggered along the third direction (Z); Each of the first protrusions (131) is inclined relative to the second direction (Y), and each of the second protrusions (132) is inclined relative to the second direction (Y). The inclination direction of the first protrusion (131) relative to the second direction (Y) is opposite to the inclination direction of the second protrusion (132) relative to the second direction (Y).

8. The battery cell according to claim 1, characterized in that, The end of the protrusion (130) that abuts against the insulating layer (122) is configured as a first plane (220), which is perpendicular to the first direction (X).

9. The battery cell according to claim 1, characterized in that, The battery cell is provided with at least a partial spacing between two adjacent protrusions (130), and the battery cell also includes a thermally conductive medium layer (140) that fills between any two adjacent protrusions (130).

10. A battery pack, characterized in that, Includes the battery cell according to any one of claims 1-9.

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