Battery cell, battery pack, and electric device
By designing a first and second clearance surface on the battery cell casing to form a large-area exhaust channel, the risk of thermal runaway caused by the small flow area of the exhaust channel in the battery pack is solved, achieving the effect of efficient exhaust and capacity balance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SVOLT ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-07-15
- Publication Date
- 2026-07-24
Smart Images
Figure CN224554608U_ABST
Abstract
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] Battery cells are typically equipped with explosion-proof valves. When the pressure inside a battery cell is too high, the airflow inside the battery cell flows toward the explosion-proof valve, allowing the battery cell to be discharged after the explosion-proof valve opens.
[0004] When multiple battery cells are integrated into a battery pack in a preset arrangement, an exhaust channel needs to be reserved in the battery pack to provide an exhaust path for the gas discharged from the explosion-proof valve.
[0005] In related technologies, due to the limited structure of individual battery cells, the flow area of the exhaust channels in the battery pack is relatively small, resulting in a high risk of thermal runaway. Utility Model Content
[0006] This application provides a battery cell, a battery pack, and an electrical device. When the battery cell is used in the battery pack, it helps to reduce the risk of thermal runaway of the battery pack to at least a certain extent.
[0007] In a first aspect, this application provides a battery cell, comprising: a housing, a terminal post, and an explosion-proof valve. The outer peripheral surface of the housing includes a first side surface, a second side surface, and a first clearance surface. The second side surface faces a different direction from the first side surface. The second side surface is connected to the first side surface through the first clearance surface. The first clearance surface is recessed within the first and second side surfaces. The housing has a mounting hole at the first clearance surface. The terminal post is mounted on the wall panel where the first side surface is located. An explosion-proof valve is installed at the mounting hole.
[0008] According to the embodiments of this application, since the first clearance surface is recessed into the first side surface and the second side surface, when the battery cell is installed in the outer casing of the battery pack, the area of the inner wall surface of the outer casing facing the first clearance surface can define an exhaust channel with a large flow area between the battery cell and the first clearance surface. In this way, when the battery cell is abnormally heated, it is beneficial to improve the airflow inside the battery cell to flow through the explosion-proof valve to the exhaust channel, thereby improving the exhaust efficiency of the battery pack and greatly reducing the risk of thermal air control of the battery pack.
[0009] In some embodiments of the first aspect of this application, the first avoidance surface is a transition plane or a transition curved surface.
[0010] In some embodiments of the first aspect of this application, the first clearance surface is a plane, and the angle between the first clearance surface and the second side surface ranges from 30° to 75°.
[0011] In some embodiments of the first aspect of this application, the outer peripheral surface of the housing includes a third side surface and a fourth side surface. The fourth side surface and the first side surface are arranged opposite to each other in a first direction, and the third side surface and the second side surface are arranged opposite to each other in a second direction. The first direction is perpendicular to the second direction. The ratio of the height dimension of the first clearance surface in the first direction to the vertical distance between the fourth side surface and the first side surface ranges from 0.08 to 0.38.
[0012] In some embodiments of the first aspect of this application, the length of the vertical projection of the first avoidance surface (15) in a plane perpendicular to the first avoidance surface (15) and perpendicular to the first side surface is in the range of 8mm to 85mm.
[0013] In some embodiments of the first aspect of this application, the outer peripheral surface of the housing includes a third side surface and a fourth side surface, the fourth side surface being disposed opposite to the first side surface in a first direction, and the third side surface and the second side surface being disposed opposite to each other in a second direction, the first direction being perpendicular to the second direction; wherein, the housing further includes a second clearance surface, the third side surface being connected to the first side surface through the second clearance surface, the second clearance surface being recessed in the third side surface and the first side surface; and / or, the ratio of the length dimension of the first side surface in the second direction to the vertical distance between the second side surface and the third side surface is in the range of 0.55 to 0.95.
[0014] In some embodiments of the first aspect of this application, the electrode is divided into a positive electrode and a negative electrode, which are spaced apart along the length of the first side. The ratio of the center distance between the positive electrode and the negative electrode to the length of the first side is in the range of 0.55 to 0.9.
[0015] In some embodiments of the first aspect of this application, the housing has a liquid injection hole on the first side; the electrode is divided into a positive electrode and a negative electrode, and the center distance between the liquid injection hole and the positive electrode is smaller than the center distance between the liquid injection hole and the negative electrode.
[0016] Secondly, this application provides a battery pack, including: a housing and a battery cell as described in any of the above technical solutions, wherein the battery cell is located inside the housing, and the battery cell forms an exhaust channel between the first clearance surface and the inner wall surface of the housing.
[0017] 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.
[0018] 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
[0019] Figure 1 A schematic diagram of an electrical device provided in this application;
[0020] Figure 2 According to Figure 1 A cross-sectional view of the battery pack shown;
[0021] Figure 3 According to Figure 2 A schematic diagram of a single battery cell is shown.
[0022] Figure 4 A cross-sectional view of another battery pack provided in this application;
[0023] Figure 5 According to Figure 4 A 3D view of the individual battery cells in the battery pack shown;
[0024] Figure 6 According to Figure 5 A schematic diagram of another view of the battery cell;
[0025] Figure 7 According to Figure 5 A schematic diagram of another view of the battery cell shown;
[0026] Figure 8 A perspective view of another battery cell provided in this application;
[0027] Figure 9 According to Figure 8 A schematic diagram of another view of the battery cell;
[0028] Figure 10 According to Figure 8 A schematic diagram of a single battery cell from another perspective;
[0029] Figure 11 A perspective view of another battery cell provided in this application.
[0030] Figure label:
[0031] 1000 electrical equipment;
[0032] Battery pack 100;
[0033] Battery cell 10; casing 1; first side 11; second side 12; third side 13; fourth side 14; first clearance surface 15; second clearance surface 16; electrode group 2; positive electrode tab 21; negative electrode tab 22; explosion-proof valve 3; liquid filling hole 4; positive electrode post 51; negative electrode post 52;
[0034] Casing 20;
[0035] Main electrical unit 200; Installation compartment 2001;
[0036] Exhaust passage 30. Detailed Implementation
[0037] 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.
[0038] 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.
[0039] 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.
[0040] 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.
[0041] 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.
[0042] 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.
[0043] 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.
[0044] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.
[0045] 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.
[0046] 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.
[0047] Please continue reading. Figure 1 The electrical equipment 1000 includes the main electrical unit 200 and the battery pack 100.
[0048] 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.
[0049] For example, the power-consuming body 200 has an installation compartment 2001, in which the battery pack 100 is installed.
[0050] 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 and individual battery cells 10.
[0051] The shape of the outer shell 20 includes, but is not limited to, a cube, a cylinder, or an irregular shape.
[0052] The battery cell 10 is installed inside the housing 20. In this way, the housing 20 can protect the battery cell 10 and improve its safety.
[0053] The battery cell 10 refers to the basic unit that can realize the interconversion of chemical energy and electrical energy.
[0054] 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.
[0055] 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.
[0056] In each battery pack 100, the number of battery cells 10 can be one or more. When there are multiple battery cells 10, they 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 the multiple battery cells 10 includes both series and parallel connections.
[0057] Please see Figure 3 , Figure 3 According to Figure 2 The diagram shows a single battery cell 10. The single battery cell 10 includes: a housing 1, an electrode assembly 2, and terminal posts.
[0058] The housing 1 has a receiving cavity. This receiving cavity is used to accommodate the electrode assembly 2 and 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 electrode assembly 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 electrode assembly 2, causing bulging deformation, 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] Electrode group 2 is located inside the containment cavity and is immersed in the electrolyte.
[0062] Electrode group 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.
[0063] To facilitate the electrical connection of electrode group 2 to the circuit, electrode group 2 has a positive electrode tab 21 and a negative electrode tab 22.
[0064] The positive electrode tab 21 can be assembled and connected (e.g., welded) to the current collector of the positive electrode sheet, or it can be formed by extending directly outward from the edge of the current collector of the positive electrode sheet, or by leaving a part of the current collector of the positive electrode sheet blank (i.e., a part without electrode material).
[0065] Similarly, the negative electrode tab 22 can be assembled and connected (e.g., welded) to the current collector of the negative electrode sheet, or it can be formed by directly extending the current collector of the negative electrode sheet outward, or by leaving a part of the current collector of the negative electrode sheet blank (i.e., a part without electrode material).
[0066] To facilitate the routing of the electrical signal from pole group 2 outside housing 1, please refer to [link / reference needed]. Figure 3 One surface of the housing 1 along the first direction F1 is designated as the first side surface 11. The electrode post is mounted on the wall panel containing the first side surface 11. Specifically, the wall panel containing the first side surface 11 has a through hole (not shown in the figure). The electrode post passes through the through hole (not shown in the figure).
[0067] There are two types of terminals, namely positive terminal 51 and negative terminal 52. Positive terminal 51 is fixed and electrically connected to positive terminal 21. Negative terminal 52 is fixed and electrically connected to negative terminal 22.
[0068] To prevent the battery cell 10 from exploding during thermal runaway, please continue reading. Figure 3 The battery cell 10 also includes an explosion-proof valve 3. A mounting hole (not shown) is located at the wall panel where the first side 11 is situated. The explosion-proof valve 3 is installed at the mounting hole.
[0069] Please return to the reference. Figure 2 When the battery cell 10 is installed inside the housing 20, the first side 11 is spaced apart from the inner wall of the housing 20 to form an exhaust channel 30. The exhaust channel 30 can communicate with the outside of the housing 20.
[0070] Combination Figure 2 and Figure 3 It can be seen that reducing the size of the battery cell 10 in the first direction F1 can increase the flow area of the exhaust channel 30. When the flow area of the exhaust channel 30 increases, when the battery cell 10 is abnormally heated, the airflow inside the battery cell 10 flows through the explosion-proof valve 3 to the exhaust channel 30 and is then discharged from the battery pack 100, which can effectively reduce the risk of thermal air control of the battery pack 100.
[0071] However, the reduction in the size of the battery cell 10 in the first direction F1 directly affects the size of the inner electrode group 2 of the battery cell 10, resulting in a reduction in the capacity of the battery cell 10.
[0072] In order to balance the large capacity of the battery cell 10 and the large flow area of the exhaust channel 30, please refer to Figure 4 and Figure 5 , Figure 4 A cross-sectional view of another battery pack 100 provided in this application; Figure 5 According to Figure 4 A perspective view of the battery cell 10 in the battery pack 100 shown. This embodiment is similar to the one described above. Figure 2 and Figure 3 The difference between the embodiments shown is that:
[0073] The outer peripheral surface of the housing 1 also includes a second side surface 12, a third side surface 13, and a fourth side surface 14.
[0074] The first side 11, the second side 12, the third side 13, and the fourth side 14 are arranged circumferentially along the shell 1. The first side 11, the second side 12, the third side 13, and the fourth side 14 all have different orientations.
[0075] Specifically, the first side 11 and the fourth side 14 are arranged opposite to each other in the first direction F1. The second side 12 and the third side 13 are arranged opposite to each other in the second direction F2. Figure 5In the specific example shown, the first direction F1 is the width direction of the housing 1, the second direction F2 is the length direction of the housing 1, and the thickness direction of the housing 1 is the third direction F3. In other embodiments, the first direction F1 can be the length direction of the housing 1, and the second direction F2 can be the width direction of the housing 1; this application does not impose specific limitations on this. For ease of explanation, the following description will use the example of the first direction F1 being the width direction of the housing 1, the second direction F2 being the length direction of the housing 1, and the thickness direction of the housing 1 being the third direction F3. The first direction F1, the second direction F2, and the third direction F3 are perpendicular to each other.
[0076] The second side 12 is connected to the first side 11 via the first clearance surface 15. The first clearance surface 15 is recessed into the first side 11 and the second side 12.
[0077] The statement "the first clearance surface 15 is recessed within the first side surface 11 and the second side surface 12" does not necessarily mean that the first clearance surface 15 is concave. It can be concave or not, as long as it does not protrude towards the side facing the first side surface 11 and is not flush with it, nor does it protrude towards the side facing the second side surface 12 and is not flush with it. Alternatively, it can be understood as follows: a first extension segment Y1 is formed along the extension trajectory of the first side surface 11, and a second extension segment Y2 is formed along the extension trajectory of the second side surface 12. The first extension segment Y1 and the second extension segment Y2 are connected. The first clearance surface 15 is located on the side of the first extension segment Y1 closer to the interior of the housing 1, and on the side of the second extension segment Y2 closer to the interior of the housing 1. Similar descriptions will be interpreted similarly in the following text and will not be repeated hereafter.
[0078] In this specific example, the first clearance surface 15 can be a transition plane. This makes the structure of the first clearance surface 15 relatively simple and easy to manufacture. Alternatively, the first clearance surface 15 can be a transition curved surface. For example, the first clearance surface 15 can be an arc surface.
[0079] The housing 1 has a mounting hole (not shown) at the first clearance surface 15. An explosion-proof valve 3 is installed at the mounting hole. Since the first clearance surface 15 is recessed into the first side surface 11 and the second side surface 12, when the battery cell 10 is installed inside the housing 20, the area of the inner wall of the housing 20 facing the first clearance surface 15 can define an exhaust channel 30 with a large flow area between it and the first clearance surface 15.
[0080] In this way, when the battery cell 10 overheats abnormally, it helps to improve the airflow inside the battery cell 10 to flow through the explosion-proof valve 3 to the exhaust channel 30, thereby improving the emission efficiency of the battery pack 100 and greatly reducing the risk of thermal air control of the battery pack 100. Furthermore, since the first clearance surface 15 is located at the junction of the first side surface 11 and the second side surface 12, there is no need to reduce the size of the battery cell 10 in the first direction F1. This helps to at least partially prevent the reduction of the size of the electrode group 2 inside the battery cell 10, and at least partially improves the capacity of the battery cell 10.
[0081] For specific examples, please refer to [link / reference]. Figure 5 and Figure 6 , Figure 6 According to Figure 5 The diagram shows another perspective of the battery cell 10. The angle θ between the first clearance surface 15 and the second side surface 12 ranges from 30° to 75°. This facilitates the rational optimization of the positional relationship between the first clearance surface 15, the second side surface 12, and the first side surface 11, and allows for a more reasonable design of the flow area of the exhaust channel 30.
[0082] For example, the included angle θ between the first clearance surface 15 and the second side surface 12 is 32°, 33°, 35°, 38°, 40°, 42°, 45°, 48°, 50°, 52°, 55°, 58°, 60°, 62°, 65° or 70°.
[0083] In some specific examples, the ratio of the height B of the first clearance surface 15 in the first direction F1 to the vertical distance H between the fourth side surface 14 and the first side surface 11 ranges from 0.08 to 0.38. This helps to ensure that the area of the first clearance surface 15 is relatively reasonable, providing sufficient space for the installation of the explosion-proof valve 3, while also ensuring that the space inside the housing 1 is relatively large, increasing the size of the electrode group 2 and ensuring the capacity of the battery cell 10.
[0084] For example, the ratio of the height dimension B of the first clearance surface 15 in the first direction F1 to the vertical distance H between the fourth side surface 14 and the first side surface 11 is 0.1, 0.12, 0.15, 0.16, 0.18, 0.2, 0.21, 0.22, 0.23, 0.25, 0.26, 0.29, 0.3, 0.32, 0.33, 0.35 or 0.36.
[0085] Generally, the larger the size of the battery cell 10, the longer the length C of the extension trajectory of the first clearance surface 15 along the circumference of the housing 1; or the larger the capacity of the battery cell 10, the longer the length C of the extension trajectory of the first clearance surface 15 along the circumference of the housing 1. However, if the length C of the extension trajectory of the first clearance surface 15 along the circumference of the housing 1 is too large, it will affect the internal capacity space of the battery cell 10. Based on this, in some specific examples, the length C of the vertical projection of the first clearance surface 15 in the plane perpendicular to the first clearance surface 15 and perpendicular to the first side surface 11 ranges from 8mm to 85mm. This helps to ensure that the area of the first clearance surface 15 is relatively reasonable, providing sufficient space for the installation of the explosion-proof valve 3, while also ensuring that the space inside the housing 1 is relatively large, increasing the size of the electrode group 2, and ensuring the capacity of the battery cell 10.
[0086] For example, in a plane perpendicular to the first clearance surface 15 and perpendicular to the first side surface 11, the length C of the vertical projection of the first clearance surface 15 is 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 42mm, 48mm, 50mm, 55mm, 60mm, 65mm, 70mm, 72mm, 78mm, or 80mm.
[0087] For specific examples, please refer to [link / reference]. Figure 5 and Figure 6 The housing 1 also includes a second clearance surface 16. The third side surface 13 is connected to the first side surface 11 via the second clearance surface 16. The second clearance surface 16 is recessed within the third side surface and the first side surface 11. The housing 1 has a mounting hole at the second clearance surface 16, where an explosion-proof valve 3 is installed. Because the second clearance surface 16 is recessed within the first side surface 11 and the third side surface 13, when the battery cell 10 is installed inside the housing 20, the area of the inner wall of the housing 20 directly opposite the second clearance surface 16 can define a large-area exhaust channel 30 between the battery cell 10 and the second clearance surface 16. Figure 4 ).
[0088] In this way, the arrangement of the first clearance surface 15 and the second clearance surface 16 is beneficial to forming multiple exhaust channels 30 between the same battery cell 10 and the inner surface of the casing 20, which greatly reduces the risk of thermal air control of the battery pack 100.
[0089] Please refer to this specific example. Figure 5 and Figure 6 The second clearance surface 16 is a transition plane. Therefore, the structure of the second clearance surface 16 is relatively simple. Alternatively, the second clearance surface 16 can also be a transition curved surface.
[0090] The specific structure of the second clearance surface 16, as well as the positional and dimensional relationships between the second clearance surface 16 and the first side surface 11 and the third side surface 13, can be referred to the first clearance surface 15, and will not be repeated here.
[0091] For specific examples, please refer to [link / reference]. Figure 6 and combined Figure 7 , Figure 7 According to Figure 5 This is a schematic diagram of the battery cell 10 from another perspective. The ratio of the length A of the first side surface 11 in the second direction F2 to the vertical distance L between the second side surface 12 and the third side surface 13 ranges from 0.55 to 0.95. This helps to ensure that the dimensions of the first side surface 11 and the first clearance surface 15 are relatively reasonable, providing sufficient space for both the installation of the explosion-proof valve 3 and the placement of the electrode post at the first side surface 11.
[0092] For example, the ratio of the length dimension A of the first side 11 in the second direction F2 to the vertical distance L between the second side 12 and the third side 13 is 0.58, 0.6, 0.62, 0.63, 0.65, 0.68, 0.7, 0.72, 0.75, 0.78, 0.8, 0.82, 0.85, 0.88, 0.9 or 0.92.
[0093] For specific examples, please refer to [link / reference]. Figure 6 and Figure 7 The vertical distance L between the second side 12 and the third side 13 is greater than or equal to 80 mm and less than or equal to 420 mm. This is beneficial in two ways: firstly, it ensures that the battery cell 10 has a relatively large size, thereby ensuring that the inner electrode group 2 of the battery cell 10 has a large size, and thus ensuring the capacity of the battery cell 10; secondly, it can also prevent problems such as inconvenient processing and difficult assembly caused by the excessive size of the battery cell 10.
[0094] For example, the vertical distance L between the second side 12 and the third side 13 is 100mm, 120mm, 150mm, 180mm, 200mm, 220mm, 250mm, 260mm, 280mm, 300mm, 320mm, 330mm, 350mm, 370mm, or 380mm.
[0095] In some specific examples, the vertical distance H between the fourth side 14 and the first side 11 is greater than or equal to 70 mm and less than or equal to 260 mm. This is beneficial in two ways: firstly, it ensures that the battery cell 10 has a relatively large size, thereby ensuring that the inner electrode group 2 of the battery cell 10 has a large size, and thus ensuring the capacity of the battery cell 10; secondly, it can also prevent problems such as inconvenient processing and difficult assembly caused by the excessive size of the battery cell 10.
[0096] For example, the vertical distance H between the fourth side 14 and the first side 11 is 80mm, 90mm, 100mm, 120mm, 130mm, 150mm, 180mm, 190mm, 200mm, 220mm, 230mm, or 250mm.
[0097] For specific examples, please refer to [link / reference]. Figure 7 The thickness D of the casing 1 in the third direction F3 is greater than or equal to 10 mm and less than or equal to 95 mm. This is beneficial in two ways: firstly, it ensures that the battery cell 10 has a relatively large size, thereby ensuring that the inner electrode group 2 of the battery cell 10 has a large size, and thus ensuring the capacity of the battery cell 10; secondly, it can also prevent problems such as inconvenient processing and difficult assembly caused by the excessive size of the battery cell 10.
[0098] For example, the thickness dimension D of the housing 1 in the third direction F3 is 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 750mm, 80mm, 85mm, or 90mm.
[0099] In some specific examples, the positive terminal 51 and the negative terminal 52 are spaced apart along the length direction (i.e., the second direction F2) of the first side surface 11. The ratio of the center distance K between the positive terminal 51 and the negative terminal 52 to the length dimension A of the first side surface 11 ranges from 0.55 to 0.9. This helps to ensure a relatively large distance between the positive terminal 51 and the negative terminal 52, avoiding the problem of insufficient space for the distribution of the positive tab 21 and the negative tab 22 within the battery cell 10 due to an excessively small distance.
[0100] For example, the ratio of the center distance K between the positive terminal 51 and the negative terminal 52 to the length dimension A of the first side surface 11 is specifically 0.58, 0.6, 0.62, 0.63, 0.65, 0.68, 0.7, 0.72, 0.75, 0.78, 0.8, 0.82, 0.85, 0.88, or 0.89.
[0101] For specific examples, please refer to [link / reference]. Figure 7The housing 1 has an injection hole 4 on the first side 11. The injection hole 4 is used to inject electrolyte into the battery cell 10 during the assembly process.
[0102] The center-to-center distance between the injection hole 4 and the positive electrode post 51 is less than the center-to-center distance between the injection hole 4 and the negative electrode post 52. This improves the safety of the battery cell 10 during use.
[0103] For example, please continue reading Figure 7 The positive electrode post 51, the liquid injection hole 4, and the negative electrode post 52 are arranged sequentially in the first direction F1. In this way, the structural layout is reasonable.
[0104] Please see Figure 8 , Figure 9 and Figure 10 , Figure 8 A perspective view of another battery cell 10 provided in this application; Figure 9 According to Figure 8 A schematic diagram of the battery cell 10 from another perspective; Figure 10 According to Figure 8 This is a schematic diagram of the battery cell 10 from another perspective. This embodiment is similar to the one described above. Figures 4-7 The difference in the embodiment shown is that the second clearance surface 16 is not provided on the outer peripheral surface of the casing 1 in this battery cell 10. The first side surface 11 is in contact with the third side surface 13.
[0105] Please see Figure 11 , Figure 11 This is a perspective view of another battery cell 10 provided in this application. This embodiment is similar to... Figures 4-10 The difference in the illustrated embodiment is that the outer peripheral surface of the housing 1 includes a groove connecting the first side surface 11 and the second side surface 12. The groove is recessed towards the interior of the housing 1, and the inner wall of the groove defines a first clearance surface 15. This helps to further increase the flow area of the exhaust channel 30 and further reduce the risk of thermal runaway of the battery cell 10.
[0106] 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.
[0107] 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.
[0108] 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.
[0109] 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: The housing has an outer peripheral surface including a first side surface, a second side surface, and a first clearance surface. The second side surface has a different orientation from the first side surface. The second side surface is connected to the first side surface through the first clearance surface. The first clearance surface is recessed into the first side surface and the second side surface. The housing has a mounting hole at the first clearance surface. A pole post, which is mounted on the wall panel on the first side; An explosion-proof valve is installed at the mounting hole.
2. The battery cell according to claim 1, characterized in that, The first avoidance surface is a transition plane or a transition curved surface.
3. The battery cell according to claim 1, characterized in that, The first clearance surface is a transition plane, and the angle between the first clearance surface and the second side surface ranges from 30° to 75°.
4. The battery cell according to claim 2, characterized in that, The outer peripheral surface of the housing includes a third side surface and a fourth side surface. The fourth side surface is arranged opposite to the first side surface in a first direction, and the third side surface and the second side surface are arranged opposite to each other in a second direction. The first direction is perpendicular to the second direction. The ratio of the height of the first clearance surface in the first direction to the vertical distance between the fourth side surface and the first side surface ranges from 0.08 to 0.
38.
5. The battery cell according to claim 1, characterized in that, In a plane perpendicular to both the first clearance surface and the first side surface, the length of the vertical projection of the first clearance surface ranges from 8mm to 85mm.
6. The battery cell according to claim 1, characterized in that, The outer peripheral surface of the housing includes a third side surface and a fourth side surface. The fourth side surface is arranged opposite to the first side surface in a first direction, and the third side surface and the second side surface are arranged opposite to each other in a second direction. The first direction is perpendicular to the second direction. The housing further includes a second clearance surface, the third side surface is connected to the first side surface through the second clearance surface, the second clearance surface is concave to the third side surface and the first side surface; and / or, the ratio of the length dimension of the first side surface in the second direction to the vertical distance between the second side surface and the third side surface is in the range of 0.55 to 0.
95.
7. The battery cell according to claim 1, characterized in that, The electrode is divided into a positive electrode and a negative electrode. The positive electrode and the negative electrode are spaced apart along the length of the first side. The ratio of the center distance between the positive electrode and the negative electrode to the length of the first side ranges from 0.55 to 0.
9.
8. The battery cell according to any one of claims 1-7, characterized in that, The housing has an injection hole on the first side; the electrode is divided into a positive electrode and a negative electrode, and the center distance between the injection hole and the positive electrode is less than the center distance between the injection hole and the negative electrode.
9. A battery pack, characterized in that, include: The outer casing, and According to any one of claims 1-8, the battery cell is located inside the housing, and the battery cell forms an exhaust channel between the first clearance surface and the inner wall surface of the housing.
10. An electrical appliance, characterized in that, include: The power-consuming body and the battery pack according to claim 9, wherein the battery pack is electrically connected to the power-consuming body to supply power to the power-consuming body.