Battery cell, battery pack, and electric device

Abstract

The application provides a battery monomer, a battery pack and a power utilization device. The battery monomer comprises a shell, a pole, an explosion-proof valve and a bare battery core. The shell has a first mounting hole and a second mounting hole. The pole is mounted at the first mounting hole, and the explosion-proof valve is mounted at the second mounting hole. The shell comprises a first cover plate. The first cover plate comprises a first plate body and a first convex bump connected with each other. The first plate body has at least one of the first mounting hole and the second mounting hole. The first convex bump protrudes outward from the first plate body to form a first groove at an inner surface of the first convex bump. The bare battery core is located in the shell and outside the first groove. The battery monomer is beneficial to increasing the accommodation space of electrolyte in the shell and improving the cycle life of the battery monomer without changing the volumetric energy density of the battery monomer.

Description

Technical Field

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

[0002] Battery cells, such as pouch-pack lithium-ion batteries, are widely used in electrical devices such as smartphones, laptops, and electric vehicles.

[0003] Currently, there are two main types of battery cells: prismatic and blade-shaped. Blade-shaped battery cells have advantages such as thinness, large casing area, good heat dissipation, lower maximum temperature during thermal runaway compared to prismatic battery cells, and higher intrinsic safety. Furthermore, blade-shaped battery cells offer high flexibility, allowing for either top and bottom cooling or single-sided cooling depending on the operating conditions. Based on these advantages, blade-shaped battery cells are widely used in electrical equipment.

[0004] However, in related technologies, blade-type battery cells generally use stacked bare cells to ensure high volumetric energy density. Stacked bare cells have a higher space utilization rate within the casing than wound bare cells. This results in less space within the casing of battery cells using stacked bare cells, leading to a reduced cycle life and making it difficult to meet the requirements of electrical devices for a cycle life greater than 10,000 cycles and a state of health (SOH) of 0.7.

[0005] Therefore, how to improve the cycle life of battery cells while keeping the volumetric energy density of the cells constant has become an urgent problem to be solved. Utility Model Content

[0006] This application provides a battery cell, a battery pack, and an electrical device, which can increase the electrolyte capacity inside the casing and improve the cycle life of the battery cell while keeping the volumetric energy density of the battery cell unchanged.

[0007] In a first aspect, this application provides a battery cell, comprising: a housing, terminals, an explosion-proof valve, and a bare battery cell; the housing has a first mounting hole and a second mounting hole, the terminals are mounted at the first mounting hole, and the explosion-proof valve is mounted at the second mounting hole; the housing includes a first cover plate, the first cover plate including a first plate body and a first protrusion, the first plate body having at least one of the first mounting hole and the second mounting hole, the first protrusion protruding outward relative to the first plate body to form a first groove on the inner surface of the first protrusion; the bare battery cell is located inside the housing and outside the first groove.

[0008] According to the battery cell of this application embodiment, when the first plate has a second mounting hole, since an explosion-proof valve is installed at the second mounting hole of the first plate, when the battery cell is installed in the outer shell of the battery pack, in order to facilitate the venting of the explosion-proof valve, an exhaust channel is formed between the first cover plate and the inner wall of the outer shell. A first protrusion protruding outward from the outer shell is provided at the first cover plate, which can be accommodated by the aforementioned original exhaust channel. When the first plate has a first mounting hole, since a terminal post is installed at the first mounting hole of the first plate, the terminal post generally protrudes from the first plate. In addition, when the battery cell is installed in the outer shell of the battery pack, a busbar structure is fixedly connected at the terminal post. Therefore, the part of the terminal post protruding from the first plate and the busbar structure together form a protruding structure. This protruding structure has a certain protruding height relative to the first plate. Furthermore, in order to facilitate the installation of the battery cells inside the casing, a certain gap is reserved between the surface of the busbar structure facing away from the first cover plate and the inner wall of the casing, for example, the gap is 2~3mm. A first protrusion protruding outward from the casing is provided at the first cover plate, and the height space occupied by the protrusion structure and the gap space are used to arrange the first protrusion.

[0009] Therefore, it can be seen that whether the first mounting hole or the second mounting hole is set at the first plate, the original space inside the battery pack can be used to accommodate the first protrusion without increasing the size of the battery cell. This is beneficial to use the first groove to accommodate more electrolyte without changing the volumetric energy density of the battery cell, thereby improving the cycle life of the battery cell.

[0010] In one possible implementation of the first aspect, the housing includes a second cover plate and a cylindrical body, the first cover plate and the second cover plate being respectively disposed at both axial ends of the cylindrical body; the second cover plate includes a connected second plate and a second protrusion, the second plate having at least one of the first mounting hole and the second mounting hole, the second protrusion protruding outward relative to the second plate to form a second groove at the inner surface of the second protrusion, the bare battery cell being located outside the second groove.

[0011] In one possible implementation of the first aspect, both the first plate and the second plate have the first mounting hole; the pole is divided into a first pole and a second pole, the first pole is installed at the first mounting hole of the first plate, and the second pole is installed at the first mounting hole of the second plate.

[0012] In one possible implementation of the first aspect, both the first plate and the second plate are provided with the second mounting holes; or, the second mounting holes are provided on the cylinder.

[0013] In one possible implementation of the first aspect, two first protrusions are formed on the first cover plate, the two first protrusions being symmetrically arranged with respect to the first mounting hole on the first cover plate; and / or, two second protrusions are formed on the second cover plate, the two second protrusions being symmetrically arranged with respect to the first mounting hole on the second cover plate.

[0014] In one possible implementation of the first aspect, the housing includes a second cover plate and a cylindrical body, the first cover plate and the second cover plate are respectively disposed at both axial ends of the cylindrical body, the first mounting hole is distributed on the second cover plate, and the second mounting hole is distributed on the first cover plate.

[0015] In one possible implementation of the first aspect, the protrusion height of the first convex hull relative to the first plate body is less than 15 mm.

[0016] Secondly, this application provides a battery pack, including: a housing, and battery cells as described in any of the above technical solutions, wherein there are multiple battery cells arranged side by side within the housing.

[0017] In one possible implementation of the second aspect, the battery pack includes a first busbar structure located within the housing and on the side facing the outer surface of the first cover plate; wherein the first plate has a first mounting hole and a second mounting hole, the first busbar structure is fixed and electrically connected to the terminal post at the first cover plate, and the first protrusion protrudes from or is flush with the first busbar structure; or, the first plate has only the first mounting hole; the first busbar structure is fixed and electrically connected to the terminal post at the first cover plate, and the first protrusion is flush with or recessed from the first busbar structure.

[0018] Thirdly, this application provides an electrical device, including: an electrical main body and the aforementioned battery pack, wherein the battery pack is electrically connected to the electrical main body to supply power to the electrical main body.

[0019] The technical effects of the second and third aspects of this application can be referred to the technical effects of the first aspect, and will not be repeated here. Attached Figure Description

[0020] Figure 1 A schematic diagram of an electrical device provided in this application.

[0021] Figure 2 According to Figure 1 The image shows a cross-sectional view of the battery pack.

[0022] Figure 3 According to Figure 2 The image shows a 3D view of a single battery cell.

[0023] Figure 4 According to Figure 3 The diagram shows an exploded view of a single battery cell.

[0024] Figure 5 According to Figure 3 The front view of the battery cell shown.

[0025] Figure 6 According to Figure 3 The diagram shows a cross-sectional view of a single battery cell at line AA.

[0026] Figure 7 A perspective view of another battery cell provided in this application.

[0027] Figure 8 According to Figure 7 The diagram shows an exploded view of a single battery cell.

[0028] Figure 9 According to Figure 7 The front view of the battery cell shown.

[0029] Figure 10 To adopt Figure 7 The image shows a cross-sectional view of the battery pack containing the individual battery cells.

[0030] Figure 11 A perspective view of another battery cell provided in this application.

[0031] Figure 12 According to Figure 11 The diagram shows an exploded view of a single battery cell.

[0032] Figure 13 According to Figure 11 The front view of the battery cell shown.

[0033] Figure label: 1000 electrical equipment; Battery pack 100; Battery cell 10; casing 1; first cover plate 11; first plate 111; first protrusion 112; first groove 1121; second cover plate 12; second plate 121; second protrusion 122; second groove 1221; cylindrical body 13; first mounting hole 14; second mounting hole 15; bare battery cell 2; explosion-proof valve 3; first terminal post 41; second terminal post 42; Casing 20; Electrical main body 200; Installation compartment 2001; Exhaust passage 30; First bus structure 40; Second bus structure 50. Detailed Implementation

[0034] The technical solutions in 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, and not all embodiments.

[0035] In this application, the accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features.

[0036] Unless otherwise stated, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items. The singular forms "a," "the," and "the" as used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0037] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified. In the description of this application, "several" means one or more, unless otherwise explicitly specified.

[0038] In the description of this application, the terms “center”, “length”, “width”, “thickness”, “height”, “inner”, “outer”, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this application and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. That is, they should not be construed as limitations on this application.

[0039] In the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "linking," "fixing," "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also 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.

[0040] In the description of this application, unless otherwise expressly defined, the terms "above," "over," "on top of," "below," "below," "under," or "below" for "first feature over second feature" can refer to the first and second features being in direct contact, or to the first and second features being in indirect contact through an intermediate medium. Furthermore, "above," "below," and "over" for "first feature over second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature over second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0041] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0042] This application provides an electrical device. This electrical device includes, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric bicycles, electric cars, ships, and spacecraft.

[0043] Please see Figure 1 , Figure 1 This is a schematic diagram of an electrical appliance 1000 provided in this application. Figure 1 The specific example shown is based on the example of an electric vehicle as the electrical device 1000, and this should not be construed as a special limitation on this application.

[0044] Please continue reading. Figure 1 The electrical equipment 1000 includes the main electrical unit 200 and the battery pack 100.

[0045] The battery pack 100 can be installed on the power-consuming body 200 and electrically connected to the power-consuming body 200, thereby facilitating the battery pack 100 to supply power to the power-consuming body 200.

[0046] For example, the power-consuming body 200 has an installation compartment 2001, in which the battery pack 100 is installed.

[0047] Please see Figure 2 , Figure 2 According to Figure 1 The diagram shows a cross-sectional view of the battery pack 100. The battery pack 100 includes a housing 20, a plurality of battery cells 10, and a busbar structure.

[0048] The shape of the outer shell 20 includes, but is not limited to, a cube or an irregular shape.

[0049] Multiple battery cells 10 are mounted side-by-side inside the housing 20. In this way, the housing 20 can protect the battery cells 10 and improve their safety.

[0050] The battery cell 10 refers to the basic unit that can realize the interconversion of chemical energy and electrical energy.

[0051] For example, the battery cell 10 can be a secondary battery, which refers to the battery cell 10 that can be recharged to activate the active materials and continue to be used after the battery cell 10 has been discharged.

[0052] The battery cell 10 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.

[0053] Multiple battery cells 10 can be connected in series, in parallel, or in a mixed manner. Among them, the mixed connection of multiple battery cells 10 means that the electrical connection relationship of multiple battery cells 10 includes both series and parallel connections.

[0054] The battery cell 10 includes, but is not limited to, blade-type battery cells and square battery cells.

[0055] Each battery cell 10 has a terminal post. A bus structure is used to fix and electrically connect to the terminal post. Specifically, the terminal post is divided into a first terminal post 41 and a second terminal post 42, one of which is the positive terminal post and the other is the negative terminal post. The bus structure is divided into a first bus structure 40 and a second bus structure 50. The first bus structure 40 is used to fix and electrically connect to the first terminal post 41, and the second bus structure 50 is used to fix and electrically connect to the second terminal post 42.

[0056] For example, a bus structure may include an insulating support, an FPC, and an electrical connection aluminum bar, etc. The specific construction of the bus structure is well known to those skilled in the art and will not be described in detail here.

[0057] Please see Figure 3 , Figure 4 and Figure 5 , Figure 3 According to Figure 2 The three-dimensional view of the battery cell 10 shown is shown. Figure 4 According to Figure 3 An exploded view of the battery cell 10 shown; Figure 5 According to Figure 3 The diagram shows a front view of the battery cell 10. In addition to the terminals, the battery cell 10 also includes a housing 1, a bare cell 2, an explosion-proof valve 3, and an electrolyte.

[0058] The housing 1 has a receiving cavity. This receiving cavity is used to receive the bare battery cell 2 and to encapsulate the electrolyte.

[0059] The housing 1 can be a rigid component. For example, the housing 1 is made of steel or aluminum. As a result, the housing 1 has high structural strength and provides good protection for the bare battery cell 2.

[0060] Of course, in other embodiments, the housing 1 can be a flexible component. Because the flexible component has a certain degree of flexibility and deformation capability, when the battery cell 10 experiences thermal management runaway or puncture, the flexible component provides a buffer space for the bare cell 2, causing it to bulge and deform, greatly reducing the risk of the battery cell 10 exploding, thereby improving the safety performance of the battery cell 10 for users. For example, the flexible component is made of an aluminum-plastic film. The aluminum-plastic film includes at least three layers: an aluminum layer in the middle, which acts as a moisture barrier; an outer nylon adhesive layer, which prevents the penetration of air, especially oxygen; and an inner polypropylene (PP) layer, which seals and prevents the electrolyte from corroding the aluminum layer.

[0061] Please continue reading. Figure 4 The housing 1 has a first mounting hole 14. The shape of the first mounting hole 14 includes, but is not limited to, a circle, a rectangle, an ellipse, or an irregular shape. The first mounting hole 14 is used to mount the pole post.

[0062] To prevent the battery cell 10 from exploding during thermal runaway, please continue reading. Figure 4 The housing 1 has a second mounting hole 15. The shape of the second mounting hole 15 includes, but is not limited to, circular, rectangular, elliptical, or irregular shapes. The second mounting hole 15 is used to install the explosion-proof valve 3.

[0063] The bare cell 2 is located inside the housing cavity and is immersed in the electrolyte.

[0064] The bare battery cell 2 typically includes a positive electrode, a negative electrode, and a separator. Both the positive and negative electrode include a current collector and an electrode material coated on the current collector. For example, the current collector for the positive electrode is aluminum foil, and the current collector for the negative electrode is copper foil. The separator is disposed between the positive and negative electrode to separate them, preventing direct contact and short circuits. For example, the separator is made of a polyolefin porous membrane.

[0065] For example, the bare cell 2 can be a stacked bare cell, that is, the bare cell 2 is formed by stacking multiple positive electrode plates, multiple negative electrode plates, and multiple separators. In other embodiments, the bare cell 2 can also be a wound bare cell, that is, the positive electrode plates, negative electrode plates, and separators are stacked to form a film, and the film is wound to form a wound bare cell.

[0066] To facilitate the electrical connection of the bare cell 2 to the circuit, the bare cell 2 has a positive tab and a negative tab. The positive tab can be assembled and connected (e.g., soldered) to the current collector of the positive electrode plate, or it can be formed by extending directly outward from the edge of the current collector of the positive electrode plate, or it can be formed by leaving a portion of the current collector of the positive electrode plate blank (i.e., an area without electrode material). The positive tab is fixed and electrically connected to the positive terminal.

[0067] Similarly, the negative electrode tab can be assembled and connected (e.g., welded) to the current collector of the negative electrode plate, or it can be formed by extending directly outward from the current collector of the negative electrode plate, or by leaving a portion of the current collector of the negative electrode plate blank (i.e., an area without electrode material). The negative electrode tab is fixed and electrically connected to the negative electrode post.

[0068] For details, please continue reading. Figure 3 , Figure 4 and Figure 5 The shell 1 includes: a first cover plate 11, a second cover plate 12, and a cylinder 13.

[0069] The first cover plate 11 is plate-shaped. For example, the first cover plate 11 may be rectangular plate-shaped.

[0070] The second cover plate 12 is plate-shaped. For example, the second cover plate 12 may be rectangular plate-shaped.

[0071] The cylinder 13 is annular in shape. For example, the cylinder 13 is rectangular annular in shape.

[0072] The cylinder 13 is open at both axial ends. The first cover plate 11 is installed on one axial end of the cylinder 13, and the second cover plate 12 is installed on the other axial end of the cylinder 13.

[0073] The first cover plate 11 includes a first plate body 111 and a first protrusion 112. The first plate body 111 is connected to the edge of the first protrusion 112.

[0074] The first plate 111 has a first mounting hole 14 and a second mounting hole 15. The first mounting hole 14 at the first plate 111 is used to mount the first pole post 41.

[0075] Based on this, please continue to refer to Figure 4 , Figure 5 and combined Figure 6 , Figure 6 According to Figure 3 The diagram shows a cross-sectional view of the battery cell 10 at line AA. A first protrusion 112 protrudes outward from the housing 1 relative to the first plate 111 to form a first groove 1121 on the inner surface of the first protrusion 112. The bare cell 2 is located outside the first groove 1121.

[0076] For details, please refer back to the original text. Figure 2On the one hand, since an explosion-proof valve 3 is installed at the second mounting hole 15 of the first plate 111, when the battery cell 10 is installed inside the housing 20, in order to facilitate the venting of the explosion-proof valve 3, an exhaust channel 30 is formed between the first cover plate 11 and the inner wall of the housing 20, which can be used to accommodate the first protrusion 112.

[0077] On the other hand, since the first terminal post 41 is installed at the first mounting hole 14 of the first plate 111, and the first terminal post 41 generally protrudes from the first plate 111, and the first terminal post 41 is fixedly connected to the first busbar structure 40, the part of the first terminal post 41 protruding from the first plate 111 and the first busbar structure 40 together form a first protruding structure. This first protruding structure has a certain protruding height relative to the first plate 111. In order to facilitate the installation of the battery cell 10 in the housing 20, a certain gap is reserved between the surface of the first busbar structure 40 facing away from the first cover plate 11 and the inner wall surface of the housing 20. For example, the gap is 2~3mm. The height space occupied by the first protruding structure and the gap space are used to arrange the first protrusion 112.

[0078] Both of the above aspects demonstrate that using the existing space within the battery pack 100 to accommodate the first protrusion 112 will not cause an increase in the size of the battery cell 10. This is beneficial because, without changing the volumetric energy density of the battery cell 10, the first groove 1121 can accommodate more electrolyte, thereby improving the cycle life of the battery cell 10. This meets the requirements of the electrical equipment 1000 for a cycle life of more than 10,000 cycles and a state of health (SOH) of 0.7 for the battery cell 10.

[0079] Furthermore, the aforementioned first convex bulge 112 can be formed using processes such as stamping, which will not significantly alter the processing technology of the casing 1 of the battery cell 10, thus helping to reduce process design costs.

[0080] Of course, it is understood that in some embodiments, the first plate 111 may only have the first mounting hole 14 and not the second mounting hole 15; or, in still other embodiments, the first plate 111 may only have the second mounting hole 15 and not the first mounting hole 14. As long as the first plate 111 has at least one of the first mounting hole 14 and the second mounting hole 15, it is acceptable.

[0081] Generally, the gap size of the exhaust channel 30 is about 12mm to 15mm. In order to prevent the protrusion height of the first protrusion 112 from being too large, which would affect the assembly of the battery cell 10 or the size of the exhaust channel 30, in some embodiments, the protrusion height H1 of the first protrusion 112 relative to the first plate 111 is less than 15mm.

[0082] Please continue reading. Figure 2 In some embodiments, the first convex hull 112 protrudes or is flush with the first busbar structure 40. Since the first busbar structure 40 is located in the exhaust channel 30 between the first cover plate 11 and the inner wall of the outer casing 20, in order to facilitate exhaust and to facilitate the installation of the battery cell 10 in the outer casing 20, a certain gap is reserved between the surface of the first busbar structure 40 facing away from the first cover plate 11 and the inner wall of the outer casing 20. For example, the gap is 2~3mm. The first protrusion 112 protrudes out of or is flush with the first busbar structure 40, which can make use of the original gap space. This is beneficial to increase the volume of the first groove 11211 without changing the volumetric energy density of the battery cell 10, so that the first groove 1121 can accommodate more electrolyte, thereby improving the cycle life of the battery cell 10 to meet the requirements of the electrical equipment 1000 for the battery cell 10 to have a cycle life of more than 10,000 times and a state of health (SOH) of 0.7. On the other hand, the first protrusion 112 can also be used to protect the first busbar structure 40.

[0083] Generally, the protrusion height of the first pole post 41 is about 2mm to 3mm, and the thickness of the first busbar structure 40 is about 5mm to 6mm. Based on this, for example, the protrusion height H1 of the first protrusion 112 relative to the first plate 111 is greater than or equal to 7mm. For example, the protrusion height of the first protrusion 112 relative to the first plate 111 is 8mm, 9mm, or 10mm.

[0084] As mentioned above, since the gap size of the exhaust channel 30 is approximately 12mm to 15mm, the protrusion height of the first terminal post 41 is generally approximately 2mm to 3mm, and the thickness of the first busbar structure 40 is approximately 5mm to 6mm. To prevent the protrusion height of the first bulge 112 from being too large, which could affect the assembly of the battery cell 10 or the exhaust of the aforementioned exhaust channel 30, in some embodiments, the protrusion height L1 of the first bulge 112 relative to the first busbar structure 40 is less than 8mm. For example, the protrusion height L1 of the first bulge 112 relative to the first busbar structure 40 is 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, or 7mm.

[0085] Please continue reading. Figure 3 , Figure 4 and Figure 5 In some embodiments, the second cover plate 12 includes a second plate body 121. The second plate body 121 has a first mounting hole 14. The first mounting hole 14 on the second plate body 121 is used to mount the second terminal 42, so that in the battery cell 10, the positive terminal and the negative terminal are respectively located at both ends of the battery cell 10. This is beneficial to placing the positive terminal and the negative terminal relatively far apart, avoiding the problem of short circuit, and improving the safety of the battery cell 10 in use.

[0086] Please continue reading. Figure 4 The second plate 121 also has a second mounting hole 15.

[0087] Based on this, please continue to refer to Figure 4 , Figure 5 and Figure 6 The second cover plate 12 includes a second protrusion 122. The second plate body 121 is connected to the edge of the second protrusion 122. The second protrusion 122 protrudes outward relative to the second plate body 121 to form a second groove 1221 on the inner surface of the second protrusion 122. The bare battery cell 2 is located outside the second groove 1221.

[0088] For details, please refer back to the original text. Figure 2 On the one hand, since an explosion-proof valve 3 is installed at the second mounting hole 15 of the second plate 121, when the battery cell 10 is installed inside the housing 20, in order to facilitate the venting of the explosion-proof valve 3, the second cover plate 12 and the inner wall of the housing 20 are spaced apart to form an exhaust channel 30, which can be used to accommodate the second protrusion 122.

[0089] On the other hand, since the second terminal post 42 is installed at the first mounting hole 14 of the second plate 121, and the second terminal post 42 generally protrudes from the second plate 121, and is fixedly connected to the second busbar structure 50, the part of the second terminal post 42 protruding from the second plate 121 and the second busbar structure 50 together form a second protruding structure. This second protruding structure has a certain protruding height relative to the second plate 121. In order to facilitate the installation of the battery cell 10 in the housing 20, a certain gap is reserved between the surface of the second busbar structure 50 facing away from the second cover plate 12 and the inner wall surface of the housing 20. For example, the gap is 2~3mm. The height space occupied by the second protruding structure and the gap space are used to arrange the second protrusion 122.

[0090] Both of the above aspects demonstrate that using the existing space within the battery pack 100 to accommodate the second protrusion 122 will not cause an increase in the size of the battery cell 10. This is beneficial because, without changing the volumetric energy density of the battery cell 10, the second groove 1221 can accommodate more electrolyte, thereby improving the cycle life of the battery cell 10. This meets the requirements of the electrical equipment 1000 for a cycle life of more than 10,000 cycles and a state of health (SOH) of 0.7 for the battery cell 10.

[0091] Furthermore, the aforementioned second convex bulge 122 can be formed using processes such as stamping, which will not significantly alter the processing technology of the casing 1 of the battery cell 10, thus helping to reduce process design costs.

[0092] Of course, it is understood that in some embodiments, the second plate 121 may only have the first mounting hole 14 and not the second mounting hole 15; or, in still other embodiments, the second plate 121 may only have the second mounting hole 15 and not the first mounting hole 14. It is sufficient that the second plate 121 has at least one of the first mounting hole 14 and the second mounting hole 15.

[0093] Generally, the gap size of the exhaust channel 30 is about 12mm to 15mm. In order to prevent the protrusion height of the second protrusion 122 from being too large, which would affect the assembly of the battery cell 10 or the size of the exhaust channel 30, in some embodiments, the protrusion height H2 of the second protrusion 122 relative to the second plate 121 is less than 15mm.

[0094] Please continue reading. Figure 2 In some embodiments, the second bulge 122 protrudes or is flush with the second busbar structure 50. Since the second busbar structure 50 is located in the exhaust channel 30 between the second cover plate 12 and the inner wall of the outer casing 20, in order to facilitate exhaust and to facilitate the installation of the battery cell 10 in the outer casing 20, a certain gap is reserved between the surface of the second busbar structure 50 facing away from the second cover plate 12 and the inner wall of the outer casing 20. For example, the gap is 2-3 mm. The second protrusion 122 protrudes out of or is flush with the first busbar structure 40, which can make use of the original gap space. This is beneficial to increase the volume of the second groove 12211 without changing the volumetric energy density of the battery cell 10, so that the second groove 1221 can accommodate more electrolyte and improve the cycle life of the battery cell 10, so as to meet the requirements of the electrical equipment 1000 for the battery cell 10 to have a cycle life of more than 10,000 times and a state of health (SOH) of 0.7. On the other hand, the second protrusion 122 can also be used to protect the first busbar structure 40.

[0095] Generally, the protrusion height of the second pole post 42 is about 2mm to 3mm, and the thickness of the second busbar structure 50 is about 5mm to 6mm. Based on this, for example, the protrusion height H2 of the second protrusion 122 relative to the second plate 121 is greater than or equal to 7mm. For example, the protrusion height H2 of the second protrusion 122 relative to the second plate 121 is 8mm, 9mm, or 10mm.

[0096] As mentioned above, since the gap size of the exhaust channel 30 is approximately 12mm to 15mm, the protrusion height of the second terminal post 42 is generally approximately 2mm to 3mm, and the thickness of the second busbar structure 50 is approximately 5mm to 6mm. To prevent the protrusion height of the second bulge 122 from being too large, which could affect the assembly of the battery cell 10 or the exhaust of the aforementioned exhaust channel 30, in some embodiments, the protrusion height L2 of the second bulge 122 relative to the second busbar structure 50 is less than 8mm. For example, the protrusion height L2 of the second bulge 122 relative to the second busbar structure 50 is 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, or 7mm.

[0097] Please see Figure 7 , Figure 8 and Figure 9 , Figure 7 A perspective view of another battery cell 10 provided in this application. Figure 8 According to Figure 7 An exploded view of the battery cell 10 shown; Figure 9 According to Figure 7 The image shows a front view of the battery cell 10. This embodiment is similar to the one described above. Figures 2-6 The difference in the illustrated embodiment is that the second mounting holes 15 are distributed on the cylinder 13. That is, the second mounting holes 15 are not provided on the first cover plate 11 and the second cover plate 12, but are only provided on the cylinder 13. Therefore, the explosion-proof valve 3 is installed on the cylinder 13.

[0098] In this way, the first cover plate 11 has more area to form the first convex 112, and similarly, the second cover plate 12 can also have more area to form the second convex 122, which can facilitate the formation of more first grooves 1121 and second grooves 1221, so as to further increase the volume of the housing 1, so as to utilize more first grooves 1121 and second grooves 1221 to accommodate more electrolyte, improve the cycle life of the battery cell 10, and meet the requirements of the electrical equipment 1000 for the battery cell 10 to have a cycle life of more than 10,000 times and a state of health (SOH) of 0.7.

[0099] For details, please continue reading. Figure 7 , Figure 8 and Figure 9 The first cover plate 11 has two first protrusions 112, meaning it has two first grooves 1121, symmetrically arranged with respect to the first mounting holes 14. The second cover plate 12 also has two second protrusions 122, meaning it has two second grooves 1221, symmetrically arranged with respect to the first mounting holes 14. Therefore, the first cover plate 11 has a reasonable structural layout and relatively uniform structural strength; similarly, the second cover plate 12 has a reasonable structural layout and relatively uniform structural strength.

[0100] Please see Figure 10 , Figure 10 To adopt Figure 7 The diagram shows a cross-sectional view of the battery pack 100 containing the battery cell 10. An exhaust channel 30 is formed between the side wall of the cylindrical body 13, which has the explosion-proof valve 3, and the inner wall of the outer casing 20. Since the first cover plate 11 does not have the explosion-proof valve 3, an exhaust channel 30 is not required between the first cover plate 11 and the inner wall of the outer casing 20, and the gap between the first cover plate 11 and the inner wall of the outer casing 20 is designed to be relatively small. Therefore, to prevent the assembly of the battery cell 10 within the outer casing 20 from being affected by the first protrusion 112 on the first cover plate 11, the first protrusion 112 is flush with the first busbar structure 40, or the first protrusion 112 is recessed into the first busbar structure 40.

[0101] The first convex bud 112 being recessed into the first busbar structure 40 means that the end of the first convex bud 112 away from the first cover plate 11 is located on the side of the first busbar structure 40 facing away from the first cover plate 11, closer to the first cover plate 11. Similar explanations in the following text should be understood in the same way and will not be repeated.

[0102] Based on this, since no explosion-proof valve 3 is provided on the second cover plate 12, there is no need to form an exhaust channel 30 between the second cover plate 12 and the inner wall surface of the outer casing 20, and the gap between the second cover plate 12 and the inner wall surface of the outer casing 20 can be designed to be relatively small. In this way, in order to prevent the second protrusion 122 on the second cover plate 12 from affecting the assembly of the battery cell 10 in the outer casing 20, the second protrusion 122 is flush with the second busbar structure 50, or the second protrusion 122 is recessed into the second busbar structure 50.

[0103] Please see Figure 11 , Figure 12 and Figure 13 , Figure 11 A perspective view of another battery cell 10 provided in this application; Figure 12 According to Figure 11An exploded view of the battery cell 10 shown; Figure 13 According to Figure 11 The image shows a front view of the battery cell 10. This embodiment is similar to the one described above. Figures 2-10 The difference in the battery cell 10 in the illustrated embodiment is that the second mounting hole 15 is distributed on the first plate 111, and the first mounting hole 14 is distributed on the second cover plate 12. This eliminates the need to mount the terminal post on the first cover plate 11, allowing the first cover plate 11 to have more area to form the first protrusion 112. This facilitates the formation of more first grooves 1121, further increasing the volume of the housing 1. This allows for the use of more first grooves 1121 to accommodate more electrolyte, improving the cycle life of the battery cell 10 and meeting the requirements of the electrical device 1000 for a cycle life greater than 10,000 cycles and a state of health (SOH) of 0.7.

[0104] Based on this, for example, the first cover plate 11 is provided with two first protrusions 112, that is, the first cover plate 11 forms two first grooves 1121, and the two first grooves 1121 are symmetrically arranged with respect to the second mounting holes 15 on the first cover plate 11. Thus, the structural layout of the entire battery cell 10 is reasonable.

[0105] It is understood that in the various embodiments of this application, the sequence number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0106] It is understood that the various implementation methods described in this application can be implemented individually or in combination, and the embodiments of this application are not limited in this respect.

[0107] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the aforementioned method implementations, and will not be repeated here.

[0108] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery cell, characterized in that, include: Housing, terminals, explosion-proof valves, and bare battery cells; The housing has a first mounting hole and a second mounting hole, the pole is mounted in the first mounting hole, and the explosion-proof valve is mounted in the second mounting hole; The housing includes a first cover plate, the first cover plate including a connected first plate body and a first protrusion, the first plate body having at least one of a first mounting hole and a second mounting hole, and the first protrusion protruding outward relative to the first plate body to form a first groove on the inner surface of the first protrusion. The bare battery cell is located inside the housing and outside the first groove.

2. The battery cell according to claim 1, characterized in that, The housing includes a second cover plate and a cylindrical body, wherein the first cover plate and the second cover plate are respectively disposed at both axial ends of the cylindrical body; The second cover plate includes a connected second plate and a second protrusion. The second plate has at least one of the first mounting hole and the second mounting hole. The second protrusion protrudes outward relative to the second plate to form a second groove on the inner surface of the second protrusion. The bare battery cell is located outside the second groove.

3. The battery cell according to claim 2, characterized in that, Both the first plate and the second plate have the first mounting hole; the pole is divided into a first pole and a second pole, the first pole is installed at the first mounting hole of the first plate, and the second pole is installed at the first mounting hole of the second plate.

4. The battery cell according to claim 3, characterized in that, Both the first plate and the second plate are provided with the second mounting holes; or, the second mounting holes are provided on the cylinder.

5. The battery cell according to claim 3, characterized in that, Two first protrusions are formed on the first cover plate, and the two first protrusions are symmetrically arranged with respect to the first mounting holes on the first cover plate; and / or, The second cover plate has two second protrusions, which are symmetrically arranged relative to the first mounting hole on the second cover plate.

6. The battery cell according to claim 1, characterized in that, The housing includes a second cover plate and a cylinder. The first cover plate and the second cover plate are respectively disposed at both ends of the axial direction of the cylinder. The first mounting hole is distributed on the second cover plate, and the second mounting hole is distributed on the first cover plate.

7. The battery cell according to any one of claims 1-6, characterized in that, The first convex bulge protrudes at a height of less than 15 mm and greater than or equal to 7 mm relative to the first plate.

8. A battery pack, characterized in that, include: The outer casing, and The battery cell according to any one of claims 1-7 is a plurality of battery cells, and the plurality of battery cells are arranged side by side within the housing.

9. The battery pack according to claim 8, characterized in that, The battery pack includes a first busbar structure located inside the housing and on the side facing the outer surface of the first cover plate; The first plate has the first mounting hole and the second mounting hole; the first busbar structure is fixed and electrically connected to the pole at the first cover plate; the first protrusion protrudes from or is flush with the first busbar structure; or... The first plate has only the first mounting hole; the first busbar structure is fixed and electrically connected to the pole at the first cover plate, and the first convex bulge is flush with or recessed into the first busbar structure.

10. An electrical appliance, characterized in that, include: The power-consuming body and the battery pack according to claim 8 or 9, wherein the battery pack is electrically connected to the power-consuming body to supply power to the power-consuming body.

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