Battery cell and battery pack

Abstract

This application provides a battery cell and a battery pack, relating to the field of battery technology. The battery cell includes a casing, a top cover, terminals, and electrode assemblies. The casing includes a body and a bottom, with the bottom connected to one side of the body and forming a receiving cavity; the top cover is connected to the side of the body away from the bottom and seals the receiving cavity; the terminals pass through the top cover; the electrode assemblies are disposed within the receiving cavity and electrically connected to the terminals; a first protrusion is recessed on the side of the bottom away from the electrode assemblies, moving towards the electrode assemblies; a second protrusion is recessed on the side of the bottom near the electrode assemblies, moving away from the electrode assemblies; both the first and second protrusions are insulated from the electrode assemblies. The battery cell provided in this application has a casing bottom with higher structural strength, better resisting the compression of the electrode assemblies and the impact of the external environment, thus improving the battery cell's service life and safety.

Description

Technical Field

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

[0002] The information disclosed in this background section is intended only to enhance the understanding of the general background of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art.

[0003] Battery cells are a crucial component of battery packs. In related technologies, reducing the thickness of the casing bottom can decrease the weight of battery cells, thereby increasing their energy density. However, a thinner casing bottom makes the cells more susceptible to deformation or breakage under pressure from electrode components or impacts from the external environment, thus affecting the lifespan and safety of the battery cells. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a battery cell and a battery pack, which aims to solve the technical problem that the bottom of the casing is prone to deformation or cracking in the related art.

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

[0006] In a first aspect, embodiments of this application provide a single battery cell, comprising:

[0007] The shell includes a body and a bottom, the bottom being connected to one side of the body and forming a receiving cavity;

[0008] A top cover is attached to the side of the shell away from the bottom of the shell and seals the receiving cavity;

[0009] The pole is inserted through the top cover;

[0010] An electrode assembly is disposed within the receiving cavity and electrically connected to the electrode post. A first protrusion is recessed on the bottom of the shell away from the electrode assembly and directed toward the electrode assembly. A second protrusion is recessed on the side of the first protrusion near the electrode assembly and directed away from the electrode assembly. Both the first protrusion and the second protrusion are insulated from the electrode assembly.

[0011] In some embodiments of the first aspect, the first protrusion has a first edge, the second protrusion has a second edge, the bottom of the shell has a third edge, and the first edge, the second edge, and the third edge are all arranged in annular shape;

[0012] The first edge is spaced apart from the third edge; and / or the second edge is spaced apart from the first edge.

[0013] In some embodiments of the first aspect, the battery cell further includes a first insulating layer disposed on the side of the first protrusion near the electrode assembly; and / or, the battery cell further includes a second insulating layer disposed on the side of the second protrusion near the electrode assembly.

[0014] In some embodiments of the first aspect, the first protrusion has a first plane on the side away from the electrode assembly, the second protrusion has a second plane on the side away from the electrode assembly, and the bottom of the shell has a third plane on the side away from the electrode assembly, wherein the first plane, the second plane, and the third plane are all perpendicular to the thickness direction of the bottom of the shell.

[0015] The distance between the second plane and the first plane is H, and the distance between the third plane and the first plane is H, satisfying: H≤H.

[0016] In some embodiments of the first aspect, a plurality of first protrusions are provided, and the plurality of first protrusions are spaced apart; and / or, a plurality of second protrusions are provided, and the plurality of second protrusions are spaced apart.

[0017] In some embodiments of the first aspect, the battery cell has a first direction, a second direction, and a third direction that are perpendicular to each other, the bottom of the casing and the top cover are respectively connected to opposite sides of the casing body in the third direction, the casing body has a first sidewall in the first direction and a second sidewall in the second direction, the dimension of the first sidewall in the second direction is smaller than the dimension of the second sidewall in the first direction, and the thickness of the bottom of the casing and the thickness of the second sidewall are equal.

[0018] The top cover is provided with an explosion-proof hole, which penetrates the top cover and communicates with the receiving cavity. The battery cell also includes an explosion-proof valve, which is disposed on the top cover and seals the explosion-proof hole.

[0019] In some embodiments of the first aspect, the second protrusion is recessed on the side away from the electrode assembly toward the direction of proximity to the electrode assembly to form a third protrusion, the third protrusion being insulated from the electrode assembly, the third protrusion having an explosion-proof hole that penetrates the third protrusion and communicates with the receiving cavity, and the battery cell further including an explosion-proof valve that is disposed on the third protrusion and covers the explosion-proof hole.

[0020] In some embodiments of the first aspect, the shell bottom, the first protrusion, the second protrusion, and the third protrusion are integrally formed.

[0021] In some embodiments of the first aspect, the explosion-proof valve and the electrode assembly are spaced apart in the thickness direction of the shell bottom.

[0022] Secondly, embodiments of this application provide a battery pack including a liquid cooling plate and a battery cell as described in any of the embodiments of the first aspect above. The bottom of the casing is disposed on the liquid cooling plate, the liquid cooling plate is attached to the second protrusion, the first protrusion has a groove on the side away from the electrode assembly, and a portion of the liquid cooling plate protrudes toward the direction close to the electrode assembly to form an attachment portion, the attachment portion being located in the groove.

[0023] The beneficial effects of this application are as follows:

[0024] The battery cell provided in this application has a first protrusion that is insulated from the electrode assembly on the side of the bottom of the casing away from the electrode assembly and a second protrusion that is insulated from the electrode assembly on the side of the first protrusion that is insulated from the electrode assembly. This concave-convex arrangement can improve the structural strength of the bottom of the casing, enabling it to better resist the compression of the electrode assembly and the impact of the external environment, thereby reducing the possibility of deformation or breakage and improving the service life and safety of the battery cell.

[0025] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 A three-dimensional structural schematic diagram of a battery cell is shown in some embodiments of this application;

[0028] Figure 2 It shows Figure 1 Decomposition structure diagram Figure 1 ;

[0029] Figure 3 It shows Figure 1 Decomposition structure diagram Figure 2 ;

[0030] Figure 4 This application shows a schematic diagram of the structure of a single battery cell from one perspective in some embodiments;

[0031] Figure 5 It shows Figure 4 A schematic diagram of the three-dimensional sectional structure at point AA;

[0032] Figure 6 It shows Figure 5 A magnified structural diagram of region B in the middle;

[0033] Figure 7 A three-dimensional structural schematic diagram of the housing is shown in some embodiments of this application;

[0034] Figure 8 This paper shows a schematic diagram of the housing structure from one perspective in some embodiments of this application;

[0035] Figure 9 It shows Figure 8 A three-dimensional sectional view of the structure at point CC;

[0036] Figure 10 A three-dimensional structural schematic diagram of the housing is shown in some other embodiments of this application.

[0037] Explanation of key component symbols:

[0038] 100 - Battery cell; 110 - Housing; 111 - Housing body; 1111 - First sidewall; 1112 - Second sidewall; 112 - Bottom of housing; 1121 - First protrusion; 1122 - Second protrusion; 1123 - First plane; 1124 - Second plane; 1125 - Third plane; 1126 - First edge; 1127 - Second edge; 1128 - Third edge; 1129 - Third protrusion; 1130 - Groove; 113 - Corner; 114 - Receiving cavity; 120 - Top cover; 121 - Explosion-proof hole; 130 - Terminal post; 140 - Electrode assembly; 151 - First insulating layer; 152 - Second insulating layer; 160 - Explosion-proof valve; X - First direction; Y - Second direction; Z - Third direction. Detailed Implementation

[0039] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0040] In the description of this application, the terms "center", "longitudinal", "lateral", "length", "width", "height", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0041] Furthermore, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Moreover, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] In the description of this application, the terms "first," "second," etc., are used to distinguish different objects and should not be construed as indicating or implying a specific order or hierarchy, or implicitly specifying the number of technical features indicated. Therefore, a feature marked "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0043] In the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction 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.

[0044] In the description of this application, the term "and / or" indicates that three relationships can exist. For example, A and / or B can represent three cases: A alone, A and B simultaneously, and B alone. Additionally, the character " / " generally indicates that the preceding and following objects have an "or" relationship.

[0045] In the description of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 80° to 90°, the two directions can be considered perpendicular; if the angle between two directions is 0° to 10°, the two directions can be considered parallel.

[0046] Battery cells are a crucial component of battery packs, primarily used for storing and releasing electrical energy. In related technologies, reducing the thickness of the battery cell's bottom casing can decrease its weight, thereby increasing its energy density. However, thinning the bottom casing makes it more susceptible to deformation or breakage under pressure from electrode components or impacts from the external environment, thus affecting the battery cell's lifespan and safety.

[0047] like Figure 1 As shown, to solve the above-mentioned technical problems, embodiments of this application provide a battery cell 100, which relates to the field of battery technology and is mainly used in battery packs, so as to be indirectly used in electrical devices or energy storage devices in the form of battery packs. Of course, the battery cell 100 can also be directly used in electrical devices or energy storage devices without taking the form of a battery pack, and no specific limitation is made to the application scenarios of the battery cell 100 here.

[0048] For example, electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, new energy vehicles, etc., and new energy vehicles can be pure electric vehicles, hybrid electric vehicles, and range-extended electric vehicles, etc.; spacecraft can be airplanes, rockets, space shuttles, drones, and spacecraft, etc.; electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.; power tools can be metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.; energy storage devices include energy storage containers, energy storage power stations, etc.; no specific limitations are made on the types of electrical devices and energy storage devices here.

[0049] like Figures 1 to 3 As shown, the battery cell 100 provided in this embodiment includes: a housing 110, a top cover 120, a terminal post 130, and an electrode assembly 140.

[0050] The housing 110 includes a body 111 and a bottom 112. The bottom 112 is connected to one side of the body 111 and forms a receiving cavity 114. The top cover 120 is connected to the side of the body 111 away from the bottom 112 and covers the receiving cavity 114. The electrode post 130 passes through the top cover 120. The electrode assembly 140 is disposed in the receiving cavity 114 and is electrically connected to the electrode post 130. The side of the bottom 112 away from the electrode assembly 140 is recessed to form a first protrusion 1121 in the direction close to the electrode assembly 140. The side of the first protrusion 1121 close to the electrode assembly 140 is recessed to form a second protrusion 1122 in the direction away from the electrode assembly 140. Both the first protrusion 1121 and the second protrusion 1122 are insulated from the electrode assembly 140.

[0051] It should be noted that "the bottom of the shell 112 is connected to one side of the body 111 and forms a receiving cavity 114" can be understood as: the bottom of the shell 112 is connected to one side of the body 111, and the body 111 and the bottom of the shell 112 together form the receiving cavity 114. In addition, both the first protrusion 1121 and the second protrusion 1122 are insulated from the electrode assembly 140, achieving electrical insulation and reducing the risk of short circuit caused by contact between the electrode assembly 140 and the housing 110.

[0052] It is understandable that, such as Figure 7 As shown, the battery cell 100 provided in this embodiment has a first protrusion 1121, which is insulated from the electrode assembly 140, recessed on the side of the bottom 112 away from the electrode assembly 140 and directed towards the electrode assembly 140. The first protrusion 1121 protrudes towards the side close to the electrode assembly 140, and a second protrusion 1122, also insulated from the electrode assembly 140, is recessed on the side of the first protrusion 1121 away from the electrode assembly 140. This arrangement of the second protrusion 1122 away from the electrode assembly 140 improves the structural strength of the bottom 112, enabling it to better withstand the compression of the electrode assembly 140 and the impact of the external environment, thus reducing the possibility of deformation or breakage. Furthermore, the first protrusion 1121 separates the electrode assembly 140 from the corner 113 formed between the bottom 112 and the body 111, reducing the risk of metal ion precipitation caused by the electrode assembly 140 compressing the corner 113.

[0053] like Figure 3 and Figure 7 As shown, in some embodiments, the first protrusion 1121 has a first edge 1126, the second protrusion 1122 has a second edge 1127, and the shell bottom 112 has a third edge 1128. The first edge 1126, the second edge 1127, and the third edge 1128 are all arranged in a ring shape. The first edge 1126 and the third edge 1128 are spaced apart; and / or, the second edge 1127 is spaced apart from the first edge 1126.

[0054] It is understandable that since the first edge 1126, the second edge 1127 and the third edge 1128 are all arranged in a ring shape, and the first edge 1126 and the third edge 1128 are spaced apart, and the second edge 1127 and the first edge 1126 are spaced apart, the bottom of the shell 112 and the first protrusion 1121 are both ring-shaped, which can better enhance the structural strength of the bottom of the shell 112.

[0055] like Figure 1 , Figure 8 and Figure 9 As shown, the battery cell 100 further includes a first insulating layer 151, which is disposed on the side of the first protrusion 1121 near the electrode assembly 140, so as to insulate the first protrusion 1121 from the electrode assembly 140 and reduce the risk of short circuit caused by contact between the electrode assembly 140 and the first protrusion 1121; and / or, the battery cell 100 also includes a second insulating layer 152, which is disposed on the side of the second protrusion 1122 near the electrode assembly 140, so as to insulate the second protrusion 1122 from the electrode assembly 140 and reduce the risk of short circuit caused by contact between the electrode assembly 140 and the second protrusion 1122.

[0056] For example, the materials of the first insulating layer 151 and the second insulating layer 152 can be: 1. Fluoropolymer materials, such as polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), etc.; 2. Polyimide (PI); 3. Epoxy resin (EP); 4. Organosilicon materials. No specific limitations are made on the materials of the insulating layers here.

[0057] Of course, for the above embodiments, an insulating film can also be wrapped around the electrode assembly 140, which can also insulate the electrode assembly 140 from the first protrusion 1121 and the second protrusion 1122, and from the housing 111. For example, the insulating film can be Mylar film (biaxially oriented polyester film made of polyethylene terephthalate), polypropylene film, polyethylene film, polyvinyl chloride film, polycarbonate film, etc., and no specific limitation is made here.

[0058] like Figures 4 to 6As shown, in some embodiments, the first protrusion 1121 has a first plane 1123 on the side away from the electrode assembly 140, the second protrusion 1122 has a second plane 1124 on the side away from the electrode assembly 140, and the bottom of the shell 112 has a third plane 1125 on the side away from the electrode assembly 140. The first plane 1123, the second plane 1124, and the third plane 1125 are all perpendicular to the thickness direction of the bottom of the shell 112. The distance between the second plane 1124 and the first plane 1123 is H1, and the distance between the third plane 1125 and the first plane 1123 is H2, satisfying: H1 ≤ H2.

[0059] It is understandable that by limiting the distance H1 between the second plane 1124 and the first plane 1123 to be less than the distance H2 between the third plane 1125 and the first plane 1123, the possibility of the second protrusion 1122 protruding from the bottom of the shell 112 can be reduced, making the battery cell 100 more structurally stable in the battery pack.

[0060] In some embodiments, a plurality of first protrusions 1121 are provided, and the plurality of first protrusions 1121 are spaced apart; and / or, a plurality of second protrusions 1122 are provided, and the plurality of second protrusions 1122 are spaced apart.

[0061] For example, the number of first protrusions 1121 and / or the number of second protrusions 1122 can be two, three, four, five, etc., and no specific limitation is made here.

[0062] It should be noted that when there are multiple first protrusions 1121 and multiple second protrusions 1122, the multiple first protrusions 1121 and the multiple second protrusions 1122 correspond one-to-one, that is, each first protrusion 1121 has a second protrusion 1122 formed on it.

[0063] It is understandable that by providing multiple first protrusions 1121 or multiple second protrusions 1122 at intervals, the structural strength of the shell bottom 112 can be better enhanced.

[0064] like Figure 1 , Figure 2 and Figure 7As shown, in some embodiments, the battery cell 100 has two perpendicular directions: a first direction X, a second direction Y, and a third direction Z. The bottom shell 112 and the top cover 120 are respectively connected to opposite sides of the body shell 111 in the third direction Z. The body shell 111 has a first sidewall 1111 in the first direction X and a second sidewall 1112 in the second direction Y. The dimension of the first sidewall 1111 in the second direction Y is smaller than the dimension of the second sidewall 1112 in the first direction X. The thickness of the bottom shell 112 and the thickness of the second sidewall 1112 are equal. The top cover 120 is provided with an explosion-proof hole 121, which penetrates the top cover 120 and communicates with the receiving cavity 114. The battery cell 100 also includes an explosion-proof valve 160, which is disposed on the top cover 120 and seals the explosion-proof hole 121.

[0065] It should be noted that "the thickness of the shell bottom 112 is equal to the thickness of the second sidewall 1112" can be understood as: the ratio of the thickness of the shell bottom 112 to the thickness of the second sidewall 1112 is between 0.8 and 1.2, that is, 0.8 ≤ thickness of the shell bottom 112 / thickness of the second sidewall 1112 ≤ 1.2.

[0066] Understandably, by making the thickness of the bottom shell 112 equal to the thickness of the second sidewall 1112, the bottom shell 112 is thinned, thereby reducing the weight of the battery cell 100 and increasing the battery energy density. Furthermore, when the battery cell 100 experiences thermal runaway, the high-temperature, high-pressure gas generated inside the casing 110 can be evacuated outside the battery cell 100 via the explosion-proof valve 160 on the top cover 120, reducing the safety risk of the battery cell 100 exploding.

[0067] like Figure 10 As shown, in some other embodiments, the second protrusion 1122 is recessed on the side away from the electrode assembly 140 towards the direction close to the electrode assembly 140 to form a third protrusion 1129. The third protrusion 1129 is insulated from the electrode assembly 140. An explosion-proof hole 121 is provided on the third protrusion 1129. The explosion-proof hole 121 penetrates the third protrusion 1129 and communicates with the receiving cavity 114. The battery cell 100 also includes an explosion-proof valve 160, which is disposed on the third protrusion 1129 and covers the explosion-proof hole 121.

[0068] It is understandable that when the explosion-proof valve 160 is arranged at the bottom of the housing 112, the explosion-proof valve 160 is disposed on the third protrusion 1129 further formed on the second protrusion 1122. The third protrusion 1129 protrudes towards the side close to the electrode assembly 140. When the battery cell 100 experiences thermal runaway, the high-temperature and high-pressure gas generated inside the housing 110 can be evacuated to the outside of the battery cell 100 through the explosion-proof valve 160 on the third protrusion 1129, which can also reduce the safety risk of the battery cell 100 exploding.

[0069] It should be noted that the insulation between the third protrusion 1129 and the electrode assembly 140 can also be achieved by setting an insulating layer or an insulating film, which will not be elaborated here.

[0070] like Figure 6 As shown, the shell bottom 112, the first protrusion 1121, the second protrusion 1122 and the third protrusion 1129 are integrally formed, which improves reliability, facilitates manufacturing and reduces assembly steps.

[0071] For example, integral molding includes stamping, injection molding, die casting, extrusion, blow molding, 3D printing, etc., without specific limitations.

[0072] Furthermore, the explosion-proof valve 160 and the electrode assembly 140 are spaced apart in the thickness direction of the housing bottom 112, which can reduce the possibility that the explosion-proof valve 160 may be damaged or blocked due to the electrode assembly 140 pressing against it.

[0073] It should be noted that the battery cell 100 provided in this embodiment mainly relies on the movement of metal ions between the positive and negative electrode plates to operate. The battery cell 100 can be cuboid, cylindrical, flat, or other shapes, and no specific limitation is made here. According to the packaging method, the battery cell 100 provided in this embodiment can be a square battery, a cylindrical battery, a pouch battery, etc., and no specific limitation is made here.

[0074] Furthermore, according to the classification of the physical state of the electrolyte, the battery cell 100 provided in this embodiment can be a liquid battery, that is, it uses a liquid electrolyte. Exemplarily, the electrode post 130 may include a positive electrode post and a negative electrode post. The electrode assembly 140 may be manufactured using a winding process or a stacking process. The electrode assembly 140 may include an electrode body and electrode tabs, the electrode tabs including a positive electrode tab and a negative electrode tab. The electrode body is immersed in the liquid electrolyte and includes a positive electrode sheet, a negative electrode sheet, and a separator layer. The separator layer is disposed between the positive electrode sheet and the negative electrode sheet. The material of the separator layer can be PP polypropylene, PE polyethylene, etc. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive electrode tab is connected to the positive current collector and to the positive electrode post. The negative electrode sheet includes a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The negative electrode tab is connected to the negative current collector and to the negative electrode post. Taking lithium ions as an example, the materials for the positive electrode current collector and the positive electrode tab can be aluminum, and the materials for the positive electrode active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, lithium manganese oxide, etc.; the materials for the negative electrode current collector and the negative electrode tab can be copper, and the negative electrode active material can be graphite, silicon, etc.

[0075] Of course, the battery cell 100 provided in this embodiment can also be a solid-state battery, that is, a solid electrolyte, such as sulfide, oxide or polymer electrolyte. Solid electrolyte can replace the separator and liquid electrolyte, and has both ion conduction and isolation functions. The type of battery cell 100 is not specifically limited here.

[0076] To address the aforementioned technical problems, embodiments of this application also provide a battery pack, including a liquid cooling plate and a battery cell 100 as described in any of the above embodiments. A bottom shell 112 is disposed on the liquid cooling plate, and the liquid cooling plate is attached to a second protrusion 1122. The side of the first protrusion 1121 away from the electrode assembly 140 has a... Figure 7 The groove 1130 shown has a portion of the liquid cooling plate protruding towards the electrode assembly 140 to form a fitting part, which is located within the groove 1130.

[0077] It is understandable that, since a portion of the bottom of the casing 112 is recessed towards the electrode assembly 140 to form a first protrusion 1121, and a portion of the first protrusion 1121 is recessed away from the electrode assembly 140 to form a second protrusion 1122, and the bottom of the casing 112 is disposed on the liquid cooling plate, the liquid cooling plate is attached to the second protrusion 1122, the side of the first protrusion 1121 away from the electrode assembly 140 has a groove 1130, and a portion of the liquid cooling plate protrudes towards the electrode assembly 140 to form a fitting portion, the fitting portion is located in the groove 1130, so that the shape of the liquid cooling plate matches the shape of the bottom of the casing 112, and the contact area between the liquid cooling plate and the casing 110 is increased by the first protrusion 1121 and the second protrusion 1122, thereby improving the liquid cooling effect of the liquid cooling plate on the battery cell 100.

[0078] It should be understood that since the battery pack provided in this embodiment has the battery cell 100 in any of the above embodiments, it has all the beneficial effects of the battery cell 100, which will not be described in detail here.

[0079] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0080] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A battery cell, characterized in that, include: The shell (110) includes a shell body (111) and a shell bottom (112), the shell bottom (112) being connected to one side of the shell body (111) and forming a receiving cavity (114). The top cover (120) is connected to the side of the shell body (111) away from the bottom of the shell (112) and covers the receiving cavity (114). The pole post (130) is inserted through the top cover (120); An electrode assembly (140) is disposed in the receiving cavity (114) and electrically connected to the electrode post (130). A first protrusion (1121) is recessed on the side of the bottom of the shell (112) away from the electrode assembly (140) and towards the electrode assembly (140). A second protrusion (1122) is recessed on the side of the first protrusion (1121) near the electrode assembly (140) and away from the electrode assembly (140). Both the first protrusion (1121) and the second protrusion (1122) are insulated from the electrode assembly (140).

2. The battery cell according to claim 1, characterized in that, The first protrusion (1121) has a first edge (1126), the second protrusion (1122) has a second edge (1127), and the shell bottom (112) has a third edge (1128). The first edge (1126), the second edge (1127), and the third edge (1128) are all arranged in a ring shape. The first edge (1126) is spaced apart from the third edge (1128); and / or, the second edge (1127) is spaced apart from the first edge (1126).

3. The battery cell according to claim 2, characterized in that, The battery cell further includes a first insulating layer (151) disposed on the side of the first protrusion (1121) near the electrode assembly (140); and / or, the battery cell further includes a second insulating layer (152) disposed on the side of the second protrusion (1122) near the electrode assembly (140).

4. The battery cell according to claim 1, characterized in that, The first protrusion (1121) has a first plane (1123) on the side away from the electrode assembly (140), the second protrusion (1122) has a second plane (1124) on the side away from the electrode assembly (140), and the bottom of the shell (112) has a third plane (1125) on the side away from the electrode assembly (140). The first plane (1123), the second plane (1124) and the third plane (1125) are all perpendicular to the thickness direction of the bottom of the shell (112). The distance between the second plane (1124) and the first plane (1123) is H1, and the distance between the third plane (1125) and the first plane (1123) is H2, satisfying: H1≤H2.

5. The battery cell according to claim 1, characterized in that, The first protrusion (1121) is provided in multiples, and the multiple first protrusions (1121) are spaced apart; and / or, the second protrusion (1122) is provided in multiples, and the multiple second protrusions (1122) are spaced apart.

6. The battery cell according to any one of claims 1 to 5, characterized in that, The battery cell has two perpendicular directions: a first direction (X), a second direction (Y), and a third direction (Z). The bottom shell (112) and the top cover (120) are respectively connected to the opposite sides of the body shell (111) in the third direction (Z). The body shell (111) has a first sidewall (1111) in the first direction (X) and a second sidewall (1112) in the second direction (Y). The dimension of the first sidewall (1111) in the second direction (Y) is smaller than the dimension of the second sidewall (1112) in the first direction (X). The thickness of the bottom shell (112) and the thickness of the second sidewall (1112) are equal. The top cover (120) is provided with an explosion-proof hole (121), which penetrates the top cover (120) and communicates with the receiving cavity (114). The battery cell also includes an explosion-proof valve (160), which is disposed on the top cover (120) and covers the explosion-proof hole (121).

7. The battery cell according to any one of claims 1 to 4, characterized in that, The second protrusion (1122) is recessed on the side away from the electrode assembly (140) towards the electrode assembly (140) to form a third protrusion (1129). The third protrusion (1129) is insulated from the electrode assembly (140). The third protrusion (1129) is provided with an explosion-proof hole (121). The explosion-proof hole (121) penetrates the third protrusion (1129) and communicates with the receiving cavity (114). The battery cell also includes an explosion-proof valve (160). The explosion-proof valve (160) is disposed on the third protrusion (1129) and covers the explosion-proof hole (121).

8. The battery cell according to claim 7, characterized in that, The shell bottom (112), the first protrusion (1121), the second protrusion (1122) and the third protrusion (1129) are integrally formed.

9. The battery cell according to claim 7, characterized in that, The explosion-proof valve (160) and the electrode assembly (140) are spaced apart in the thickness direction of the shell bottom (112).

10. A battery pack, characterized in that, The device includes a liquid cooling plate and a battery cell according to any one of claims 1 to 9, wherein the bottom shell (112) is disposed on the liquid cooling plate, the liquid cooling plate is attached to the second protrusion (1122), the first protrusion (1121) has a groove (1130) on the side away from the electrode assembly (140), and a portion of the liquid cooling plate protrudes toward the electrode assembly (140) to form an attachment portion, the attachment portion being located in the groove (1130).

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