Battery monomer, battery device and electric equipment
By setting a concave-convex structure that fits between the electrode post and the adapter, the problem of low heat transfer efficiency of the adapter is solved, achieving higher heat conduction efficiency and welding firmness, and improving the overall performance of the battery.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-14
- Publication Date
- 2026-04-03
AI Technical Summary
The low heat transfer efficiency of existing adapters limits the charging speed and performance of batteries.
The pole and the adapter are provided with a first concave-convex structure and a second concave-convex structure that fit each other, such as a wavy or sawtooth structure, to increase the contact area and improve the heat conduction efficiency. At the same time, the design of the adapter is optimized to reduce misalignment and improve the weld strength.
By increasing the heat dissipation area and contact area of the adapter, the heat conduction efficiency is improved, the risk of tab flipping is reduced, costs are saved, and the weld strength and overall battery performance are enhanced.
Smart Images
Figure CN224082652U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of lithium battery manufacturing technology, and in particular to a battery cell, battery device and electrical equipment. Background Technology
[0002] With the increasing demand for faster battery charging speeds, improving the heat transfer efficiency of adapters has become a key issue. Utility Model Content
[0003] The main objective of this application is to provide a battery cell, battery device, and electrical equipment that aims to at least improve the technical problem of low heat transfer efficiency of the adapter.
[0004] To achieve the above objectives, according to some embodiments of this application, this application provides a battery cell, including a housing, an electrode assembly, an end cover, and an adapter. The housing has a receiving cavity. The electrode assembly includes a bare cell and a tab disposed on the bare cell. The end cover covers the opening of the housing and has a terminal post. The terminal post has a first concave-convex structure on the side facing the receiving cavity. The adapter includes a substrate and a first connecting portion and a second connecting portion disposed on the substrate. The first connecting portion has a second concave-convex structure, and the first concave-convex structure and the second concave-convex structure fit together. The second connecting portion is connected to the tab.
[0005] By setting a first concave-convex structure and a second concave-convex structure that fit together on the pole and the adapter respectively, the offset of the adapter is reduced, thereby making the adapter wider and increasing the heat dissipation surface area of the adapter, which is beneficial to improving the heat conduction efficiency of the adapter.
[0006] In some embodiments, the first concave-convex structure includes a first wave-shaped structure, the first wave-shaped structure including a plurality of periodically alternating first peaks and a plurality of first troughs, wherein a first trough is connected between two adjacent first peaks and a first peak is connected between two adjacent first troughs; the second concave-convex structure includes a second wave-shaped structure, the second wave-shaped structure including a plurality of periodically alternating second peaks and a plurality of second troughs, wherein a second trough is connected between two adjacent second peaks and a second peak is connected between two adjacent second troughs; the first peaks and the second troughs cooperate, and the second peaks and the first troughs cooperate, so that the first concave-convex structure and the second concave-convex structure fit together.
[0007] By setting both the first and second concave-convex structures to be wavy, and using a smooth transition, damage is less likely to occur when they fit together.
[0008] In some embodiments, the first concave-convex structure includes a first serrated structure, the first serrated structure including a plurality of periodically alternating first tooth tips and a plurality of first tooth grooves, wherein a first tooth groove is connected between two adjacent first tooth tips, and a first tooth tip is connected between two adjacent first tooth grooves; the second concave-convex structure includes a second serrated structure, the second serrated structure including a plurality of periodically alternating second tooth tips and a plurality of second tooth grooves, wherein a second tooth groove is connected between two adjacent second tooth tips, and a second tooth tip is connected between two adjacent second tooth grooves; the first tooth tip mates with the second tooth groove, and the second tooth tip mates with the first tooth groove, so that the first concave-convex structure and the second concave-convex structure fit together.
[0009] By setting the first concave-convex structure including a first sawtooth structure and the second concave-convex structure including a second sawtooth structure, the first concave-convex structure and the second concave-convex structure fit together through the interlocking of the first sawtooth structure and the second sawtooth structure, which not only increases the contact area between the pole post and the first connection part, which is beneficial to improving the current carrying capacity and heat conduction efficiency, but also simplifies the manufacturing process.
[0010] In some embodiments, the battery cell further includes a plastic component, and the adapter is disposed on the plastic component. In a first direction, the distance between the outer edge of the adapter and the outer edge of the plastic component is 1mm to 2mm; the first direction is the width direction of the battery cell.
[0011] By setting a smaller margin between the outer edge of the adapter and the outer edge of the plastic part in the first direction, the width of the adapter in the first direction can be made larger, thereby increasing the heat dissipation area of the adapter and further improving the heat conduction efficiency of the adapter; at the same time, the tabs can be made shorter, which helps to save costs and reduce the risk of tab flipping.
[0012] In some embodiments, a groove is provided on the side of the first connecting portion facing the pole post, and a second concave-convex structure is provided at the bottom of the groove. The pole post extends into the groove so that the first concave-convex structure and the second concave-convex structure fit together.
[0013] By providing a groove in the first connection part, which accommodates at least part of the pole post, the internal space of the battery cell can be fully utilized, which helps to reduce the height of the battery cell.
[0014] In some embodiments, the shape of the groove is adapted to the shape of the pole post, and the inner sidewall of the groove abuts against the outer sidewall of the pole post.
[0015] By adapting the shape of the groove to match the shape of the pole, the pole can be positioned, facilitating the fitting of the first and second concave-convex structures, as well as the subsequent welding of the adapter and the pole.
[0016] In some embodiments, the second connecting portion is disposed on both sides of the substrate along a second direction, the second direction being the length direction of the battery cell.
[0017] By setting the second connection part on both sides of the substrate along the second direction, the electrode tab can be misaligned with the explosion-proof valve and the electrode post in the first direction, so that the electrode tab has more manufacturing space and can be made larger, which is beneficial to improving the current carrying capacity and heat conduction efficiency.
[0018] In some embodiments, a positioning groove is provided on the side of the first connecting portion away from the pole post, with a third direction as the projection direction, the projection of the positioning groove covering the projection of the pole post, and the third direction being the height direction of the battery cell.
[0019] The side of the pole facing the first connecting part is the first welding surface, which has a first concave-convex structure. The side of the first connecting part facing the pole is the second welding surface, which has a second concave-convex structure. After the first welding surface and the second welding surface come into contact, the first concave-convex structure and the second concave-convex structure fit together, and then the pole and the adapter are welded. The welding can be ultrasonic welding or laser welding, and the welding equipment operates from the side of the adapter away from the pole. The positioning groove is a recessed groove used to position the welding head of the welding equipment. The third direction is the height direction, which is also the thickness direction of the adapter. Along the projection of the third direction, the projection of the positioning groove covers the projection of the pole, or in other words, the projection of the pole is within the outer contour of the projection of the positioning groove. In this way, when the welding head is aligned with the positioning groove for welding, the welding head can contact various positions on the first welding surface of the pole, improving the reliability of the weld.
[0020] By setting a positioning groove and ensuring that the projection of the positioning groove covers the projection of the pole, the welding head can be positioned more easily, thus improving the strength of the weld.
[0021] In some embodiments, the third welding surface of the second connecting portion is provided with a third concave-convex structure, and the fourth welding surface of the electrode tab is provided with a fourth concave-convex structure. The third concave-convex structure and the fourth concave-convex structure are fitted together, and the second connecting portion and the electrode tab are welded through the third welding surface and the fourth welding surface.
[0022] By providing a third concave-convex structure on the second connection portion and a fourth concave-convex structure on the tab, the third and fourth concave-convex structures fit together when the tab contacts the second connection portion, which can improve the current carrying capacity and heat conduction efficiency of the battery cell.
[0023] In some embodiments, the second connecting portion is provided with a slot on the side facing the tab, the third concave-convex structure is provided at the bottom of the slot, and the tab extends into the slot.
[0024] By setting a slot on the second connecting part, a preliminary positioning function can be achieved, which facilitates the connection between the second connecting part and the electrode tab.
[0025] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description
[0026] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.
[0027] Figure 1 This is a schematic diagram of the vehicle structure according to some embodiments of this application;
[0028] Figure 2 This is an exploded view of the battery device according to some embodiments of this application;
[0029] Figure 3 This is an exploded structural diagram of a battery cell according to some embodiments of this application;
[0030] Figure 4 This is a schematic diagram of the terminal post and adapter of a battery cell according to some embodiments of this application from one perspective.
[0031] Figure 5 This is a schematic diagram of the terminal post and adapter of a battery cell according to some embodiments of this application from another perspective.
[0032] Figure 6 This is a schematic diagram of the structure of a battery cell adapter according to some embodiments of this application;
[0033] Figure 7 This is a cross-sectional structural schematic diagram of the terminal post and adapter of a battery cell according to some embodiments of this application;
[0034] Figure 8 for Figure 7 A magnified structural diagram at point A;
[0035] Figure 9This is a cross-sectional schematic diagram of the first and second wavy structures of a battery cell according to some embodiments of this application;
[0036] Figure 10 This is a schematic diagram of the structure of the plastic parts and adapters of the battery cell in some embodiments of this application;
[0037] Figure 11 This is yet another structural schematic diagram of the adapter for a battery cell in some embodiments of this application;
[0038] Figure 12 This is another structural schematic diagram of the adapter for a battery cell in some embodiments of this application.
[0039] Explanation of icon numbers:
[0040] 1000, vehicles;
[0041] 100. Battery device; 200. Control device; 300. Motor;
[0042] 10. Box body; 11. Cover plate; 12. Main body;
[0043] 20. Battery cell;
[0044] 1. Housing; 2. End cover plate; 3. Electrode assembly; 31. Bare cell; 32. Electrode tab; 4. Terminal post; 41. First concave-convex structure; 411. First wavy structure; 412. First serrated structure; 5. Adapter; 51. Second concave-convex structure; 511. Second wavy structure; 512. Second serrated structure; 52. First connecting part; 53. Substrate; 54. Second connecting part; 55. Groove; 56. Positioning groove; 6. Plastic part; 7. Explosion-proof valve.
[0045] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation
[0046] The technical solutions in this embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.
[0047] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this embodiment are only used to explain the relative positional relationship and movement of each component in a specific posture (as shown in the attached figure). If the specific posture changes, the directional indicator will also change accordingly.
[0048] Furthermore, the use of terms such as "first," "second," etc., in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0049] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0050] Furthermore, the technical solutions of the various embodiments of this application can be combined with each other, but only if they are feasible to those skilled in the art. If a combination of technical solutions contradicts each other or cannot be implemented, it should be considered that such a combination does not exist and is not within the scope of protection claimed in this application. It should be understood that the specific embodiments described herein are merely illustrative of this application and are not intended to limit this application.
[0051] The descriptions of directions such as "up", "down", "front", "back", "left", and "right" in this application are based on the directions shown in the accompanying drawings and are only used to explain the relative positional relationships between the components in the posture shown in the figures. If the specific posture changes, the directional indication will also change accordingly.
[0052] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields. With the continuous expansion of power battery applications, market demand is also constantly increasing.
[0053] As battery cell technology continues to evolve and improve, there is a growing demand for higher volumetric energy density, higher rate capability, and lower costs. To meet these demands, battery cells often employ extreme designs. As the connecting component between the tab and the terminal, the adapter is typically thickened to improve heat transfer efficiency. However, the adapter and terminal are usually laser-welded. Due to the inherent limitations of laser welding, the laser energy cannot penetrate a thick adapter for welding. Therefore, the adapter cannot be too thick; otherwise, the laser energy will not reach the contact area between the adapter and the terminal, hindering localized melting and connection. This limits the heat transfer capacity of the adapter.
[0054] To address this, this application provides a battery cell comprising a casing, an electrode assembly, an end cover, and an adapter. The casing has a receiving cavity. The electrode assembly includes a bare cell and tabs disposed on the bare cell. The end cover covers the opening in the casing and has a terminal post. A first convex-concave structure is provided on the side of the terminal post facing the receiving cavity. The adapter includes a substrate and a first connecting portion and a second connecting portion disposed on the substrate. The first connecting portion has a second convex-concave structure, and the first and second convex-concave structures are fitted together. The second connecting portion is connected to the tabs. This battery cell adapter can be made wider, increasing the heat dissipation surface area of the adapter and improving its heat conduction efficiency.
[0055] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The electrical equipment can be the vehicle 1000, which can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a control device 200 and a motor 300. The control device 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.
[0056] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.
[0057] Please refer to Figure 2 , Figure 2This is an exploded structural diagram of a battery device 100 provided in some embodiments of this application. The battery device 100 includes a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 provides a cavity for the battery cell 20, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a cover plate 11 and a body 12, with the cover plate 11 and body 12 overlapping each other, jointly defining a cavity for accommodating the battery cell 20. The body 12 may be a hollow structure with one open end, and the cover plate 11 may be a plate-like structure, covering the open side of the body 12 so that the cover plate 11 and body 12 jointly define the cavity; alternatively, the cover plate 11 and body 12 may both be hollow structures with one open side, with the open side of the cover plate 11 covering the open side of the body 12. Of course, the housing 10 formed by the cover plate 11 and body 12 can be of various shapes, such as a cylinder, a cuboid, etc.
[0058] In the battery device 100, there can be multiple battery cells 20, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, parallel, or in a mixed manner to form battery cell 20 modules, and then these modules are further connected in series, parallel, or in a mixed manner to form a whole, which is then housed within the housing 10. The battery device 100 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 20.
[0059] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes. The battery cell 20 referred to in this application is primarily a cylindrical battery cell 20.
[0060] Please refer to Figure 3 The battery cell 20 refers to the smallest unit that makes up the battery device 100. The battery cell 20 includes a housing 1, an end cap assembly, an electrode assembly 3, an adapter 5, and other functional components.
[0061] The housing 1 is an assembly used to cooperate with the end cover plate 2 to form the internal environment of the battery cell 20. This internal environment can accommodate the electrode assembly 3, insulating sheet, electrolyte, and other components. The end cover assembly includes the end cover plate 2, the electrode post 4, and the explosion-proof valve 7. The housing 1 and the end cover plate 2 can be independent components. An opening can be provided on the housing 1, and the end cover plate 2 can close the opening to form the internal environment of the battery cell 20, isolating it from the external environment. Alternatively, the end cover plate 2 and the housing 1 can be integrated. Specifically, the end cover plate 2 and the housing 1 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 1, the end cover plate 2 closes the housing 1. The housing 1 can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 1 can be determined according to the specific shape and size of the electrode assembly 3. The material of the housing 1 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This application embodiment does not impose any special limitations on this.
[0062] The shape of the end cover 2 can be adapted to the shape of the housing 1 to fit the housing 1. Optionally, the end cover 2 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cover 2 is not easily deformed when subjected to compression and impact, so that the battery cell 20 can have higher structural strength and the safety performance can also be improved.
[0063] An insulating sheet can also be provided on the inner side of the end cover plate 2. The insulating sheet can be used to isolate the electrical connection components inside the housing 1 from the end cover plate 2 to reduce the risk of short circuits. The insulating sheet can be provided with multiple hot-melt points, which are arranged at intervals along the circumference of the insulating sheet. The insulating sheet and the hot-melt points are bonded together by a hot-melt process to assemble the electrode assembly 3, the end cover plate 2, and the insulating sheet together. After the electrode assembly 3, the end cover plate 2, and the insulating sheet are assembled, they are then installed into the housing 1 together, which is convenient for assembly. For example, the insulating sheet can be a plastic part 6, a rubber part, etc.
[0064] The explosion-proof valve 7 is used to release internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The terminal post 4 is used for electrical connection to the electrode assembly 3 to output or input electrical energy to the battery cell 20. The terminal post 4 includes a positive terminal post and a negative terminal post, which can be located on either side of the explosion-proof valve 7 along the length of the battery cell 20. That is, the positive terminal post, the explosion-proof valve 7, and the negative terminal post are distributed at intervals along the length of the battery cell 20.
[0065] Electrode assembly 3 is the component in the battery cell 20 where the electrochemical reaction takes place. Electrode assembly 3 is mainly formed by winding or stacking positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of electrode assembly 3, also called bare cell 31, while the portions of the positive and negative electrode sheets without active material each constitute tabs 32. The positive and negative tabs can be located together at one end of the main body or separately at both ends of the main body.
[0066] Specifically, the positive electrode 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, and the current collector without the positive active material layer protrudes from the current collector with the positive active material layer. The current collectors without the positive active material layer are stacked together to form the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The negative electrode 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, and the current collector without the negative active material layer protrudes from the current collector with the negative active material layer. The current collectors without the negative active material layer are stacked together to form the negative electrode tab. The material of the negative current collector can be copper, and the negative active material can be carbon or silicon, etc. The separator can be made of PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly 3 can be a wound structure or a stacked structure.
[0067] During the charging and discharging process of the battery cell 20, the positive and negative active materials react with the electrolyte. The tabs 32 are connected to the terminals 4 via adapter 5 to form a current loop. The tabs 32 include a positive tab and a negative tab. The positive tab is connected to the positive terminal via adapter 5, and the negative tab is connected to the negative terminal via adapter 5. The low thermal resistance path in the cell's thermal design is: terminal 4 - adapter 5 - tab 32 - bare cell 31 - electrolyte - casing 1. Adapter 5 is used to prevent damage to the battery or burnout of other components in the event of a short circuit or overcharging / overdischarging of the electrode assembly 3, thereby ensuring the safety of battery use. Generally, adapter 5 has a sheet-like structure.
[0068] Reference Figures 4 to 6According to some embodiments of this application, this application provides a battery cell 20, including a housing 1, an electrode assembly 3, an end cover plate 2, and an adapter 5. The housing 1 is provided with a receiving cavity. The electrode assembly 3 includes a bare cell 31 and a tab 32 disposed on the bare cell 31. The end cover plate 2 covers the opening of the housing 1 and is provided with a pole post 4. A first concave-convex structure 41 is provided on the side of the pole post 4 facing the receiving cavity. The adapter 5 includes a substrate 53 and a first connecting portion 52 and a second connecting portion 54 disposed on the substrate 53. The first connecting portion 52 is provided with the second concave-convex structure 51. The first concave-convex structure 41 and the second concave-convex structure 51 fit together. The second connecting portion 54 is connected to the tab 32.
[0069] The electrode post 4 may include a positive electrode post and a negative electrode post, and the electrode tab 32 includes a positive electrode tab and a negative electrode tab. There are generally at least two adapters 5, one for electrically connecting the positive electrode tab and the positive electrode post, and the other for electrically connecting the negative electrode tab and the negative electrode post to form a circuit. The substrate 53 is the base component on the adapter 5. The first connecting portion 52 and the second connecting portion 54 are respectively disposed on both sides of the substrate 53. The side of the electrode post 4 facing the receiving cavity is the side used to connect with the first connecting portion 52. The first uneven structure 41 refers to the uneven structure provided on the side of the electrode post 4 connected to the first connecting portion 52, which is different from a conventional planar structure and can be a structure with multiple protrusions and recesses. Similarly, the second concave-convex structure 51 refers to the uneven structure on the side where the first connecting part 52 connects to the pole post 4, which is different from the conventional smooth and flat planar structure. When the pole post 4 contacts the first connecting part 52, the first concave-convex structure 41 and the second concave-convex structure 51 can fit together. That is, the protrusion of the first concave-convex structure 41 and the groove of the second concave-convex structure 51 match, and the protrusion of the second concave-convex structure 51 matches the groove of the first concave-convex structure 41. Of course, those skilled in the art will understand that the pole post 4 and the first connecting part 52 can also be welded together by ultrasonic welding or laser welding. The first concave-convex structure 41 is provided on the side where the pole post 4 connects to the first connecting part 52, and the second concave-convex structure 51 that can fit with the first concave-convex structure 41 is provided on the first connecting part 52. This increases the contact area between the pole post 4 and the adapter 5. The increased contact area can reduce the resistance at the connection point, allowing the current to pass through more quickly and improving the current carrying capacity. Furthermore, in related technologies, to reduce the risk of short circuits caused by misalignment of the adapter 5 and its connection with other components, a larger offset is reserved for the adapter 5. In this application, since the terminal post 4 and the first connecting part 52 are connected by a concave-convex structure, it can effectively resist shear forces parallel to the mating surface and reduce the relative misalignment between the terminal post 4 and the adapter 5. Of course, by setting the first concave-convex structure 41 and the second concave-convex structure 51 for pre-fitting before welding, the positioning capability during battery installation can also be improved.
[0070] By setting a first concave-convex structure 41 and a second concave-convex structure 51 that fit together on the pole post 4 and the adapter 5 respectively, the offset of the adapter 5 can be reduced, the adapter 5 can be made wider, the heat dissipation surface area of the adapter 5 is increased, which is beneficial to improving the heat conduction efficiency of the adapter 5.
[0071] Please refer to Figure 7 and Figure 8 In some embodiments, the first concave-convex structure 41 includes a first serrated structure 412, which includes a plurality of periodically alternating first tooth tips and a plurality of first tooth grooves, wherein a first tooth groove is connected between two adjacent first tooth tips and a first tooth tip is connected between two adjacent first tooth grooves; the second concave-convex structure 51 includes a second serrated structure 512, which includes a plurality of periodically alternating second tooth tips and a plurality of second tooth grooves, wherein a second tooth groove is connected between two adjacent second tooth tips and a second tooth tip is connected between two adjacent second tooth grooves; the first tooth tip mates with the second tooth groove, and the second tooth tip mates with the first tooth groove, so that the first concave-convex structure 41 and the second concave-convex structure 51 fit together.
[0072] The serrated structure here can include multiple straight convex strips and grooves between two adjacent convex strips. The grooves also extend along the extension direction of the convex strips. When the pole post 4 contacts and engages with the first connecting part 52, the first tooth tip extends into the second tooth groove, and the second tooth tip extends into the first tooth groove. Through the engagement of the tooth tip and the tooth groove, the first concave-convex structure 41 and the second concave-convex structure 51 fit together. This is equivalent to increasing the contact area between the pole post 4 and the first connecting part 52, and the process steps for making the serrated structure are relatively simple.
[0073] By setting the first concave-convex structure 41 to include a first sawtooth structure 412 and the second concave-convex structure 51 to include a second sawtooth structure 512, the first concave-convex structure 41 and the second concave-convex structure 51 fit together through the interlocking of the first sawtooth structure 412 and the second sawtooth structure 512. This not only increases the contact area between the pole post 4 and the first connecting part 52, which is beneficial to improving the current carrying capacity and heat conduction efficiency, but also simplifies the manufacturing process.
[0074] Please refer to Figure 9In some embodiments, the first concave-convex structure 41 includes a first wave-shaped structure 411, which includes a plurality of periodically alternating first peaks and a plurality of first troughs, wherein a first trough is connected between two adjacent first peaks and a first peak is connected between two adjacent first troughs; the second concave-convex structure 51 includes a second wave-shaped structure 511, which includes a plurality of periodically alternating second peaks and a plurality of second troughs, wherein a second trough is connected between two adjacent second peaks and a second peak is connected between two adjacent second troughs; the first peaks and second troughs cooperate, and the second peaks and first troughs cooperate, so that the first concave-convex structure 41 and the second concave-convex structure 51 fit together.
[0075] In layman's terms, both the first concave-convex structure 41 and the second concave-convex structure 51 are wavy. In a specific embodiment, the maximum amplitude of the first peak of the first concave-convex structure 41 and the maximum amplitude of the second trough of the second concave-convex structure 51 are the same, and the maximum amplitude of the first trough of the first concave-convex structure 41 and the maximum amplitude of the second peak of the second concave-convex structure 51 are the same. This allows the two wavy structures to fit together perfectly, which is equivalent to increasing the contact area between the pole post 4 and the first connecting part 52. Furthermore, the wavy transition is smooth, making it less likely to cause damage when they come into contact. In some specific embodiments, taking the thickness of the adapter 5 as an example of 0.8mm, the wavy surfaces of the first concave-convex structure 41 and the second concave-convex structure 51 can adopt a sine wave waveform. For example, the wavelength can be set to 1.0 mm ± 0.05 mm (center-to-center distance between adjacent peaks), and the amplitude (A) can be set to 0.05 mm ± 0.02 mm (height of peak / trough from the centerline). To prevent stress concentration, the peak / trough fillet radius (R) is R = 0.1 mm, and the total thickness of the waveform area can be set to 0.1 mm ± 0.05 mm. Of course, those skilled in the art will understand that the above are merely illustrative examples and do not constitute a limitation on the specific design parameters of this application.
[0076] By setting both the first concave-convex structure 41 and the second concave-convex structure 51 to be wavy structures, a smooth transition is adopted, which makes it less likely to cause damage when they fit together.
[0077] Please refer to Figure 10 In some embodiments, the battery cell 20 further includes a plastic part 6, which is disposed on the side of the adapter 5 facing the receiving cavity. The adapter 5 is disposed on the plastic part 6. In a first direction, the distance between the outer edge of the adapter 5 and the outer edge of the plastic part 6 is 1mm to 2mm. The first direction is the width direction of the battery cell 20.
[0078] It should be noted that the "first direction" in this application refers to the width direction of the battery, such as... Figure 3 or Figure 7 The middle arrow X indicates the direction; the second direction refers to the length of the battery, such as... Figure 3 The middle arrow Y indicates the direction; the third direction refers to the height of the battery, such as... Figure 3 or Figure 7 As indicated by arrow Z. The plastic part 6 can be a plastic sheet, serving as an insulator. The adapter 5 can also be a sheet-like adapter. Generally, the adapter 5 is made of metals such as copper or aluminum. The adapter 5 is mounted on the plastic part 6. The plastic part 6 can be located on the side of the adapter 5 facing the receiving cavity, or on the side of the adapter 5 away from the receiving cavity, to isolate the adapter 5 from the end cover plate 2; or, the plastic part 6 can be located on both sides of the adapter 5. Taking the example where the plastic part 6 is located on the side of the adapter 5 facing the receiving cavity, the plastic part 6 serves to isolate the adapter 5 from the bare battery cell 31. Simultaneously, during manufacturing, to reduce the risk of the adapter 5 shifting and contacting the bare battery cell 31 or the housing 1, a certain margin is designed between the outer edge of the adapter 5 and the outer edge of the plastic part 6 in the first direction. In related technologies, this allowance is generally designed to be 3mm or more. However, in the technical solution of this application, because the adapter 5 and the pole 4 are connected by the first concave-convex structure 41 and the second concave-convex structure 51, the resistance to shear force parallel to the mating surface is increased. The mating surface here is also a surface parallel to the XY plane. This reduces the relative sliding between the adapter 5 and the pole 4, that is, reduces the risk of the adapter 5 shifting in the first direction. Therefore, the width of the adapter 5 can be designed to be wider, and the distance between the outer edge of the adapter 5 and the outer edge of the plastic part 6 can be designed to be 1mm to 2mm. In the first direction, the distance between the outer edge of the adapter 5 and the outer edge of the plastic part 6 is as follows: Figure 10 As shown in d. In addition, by making the adapter 5 wider, the height of the tab 32 can be appropriately reduced, saving raw materials for manufacturing the tab 32 and reducing the risk of the tab 32 flipping due to excessive height.
[0079] By setting a smaller margin between the outer edge of the adapter 5 and the outer edge of the plastic part 6 in the first direction, the width of the adapter 5 in the first direction can be made larger, thereby increasing the heat dissipation area of the adapter 5 and further improving the heat conduction efficiency of the adapter 5; at the same time, the tab 32 can be made shorter, which is beneficial to saving costs and reducing the risk of the tab 32 flipping.
[0080] Please refer to Figure 11 In some embodiments, the first connecting part 52 is provided with a groove 55 on the side facing the pole post 4, and a second concave-convex structure 51 is provided at the bottom of the groove 55. The pole post 4 extends into the groove 55 so that the first concave-convex structure 41 and the second concave-convex structure 51 fit together.
[0081] The groove 55 is formed by recessing the first connecting portion 52 towards the side away from the terminal post 4. The groove 55 includes a groove bottom and a groove sidewall formed around the groove bottom, and a second concave-convex structure 51 is provided on the groove bottom. In the specific manufacturing process, the terminal post 4 is first inserted into the groove 55, so that the first concave-convex structure 41 and the second concave-convex structure 51 fit together, and then the terminal post 4 is welded to the adapter 5. Since the tab 32 is generally designed to protrude from the bare cell 31, for some battery cells 20, there will be a gap between the substrate 53 and the bare cell 31. By recessing the first connecting portion 52 towards the gap side, the space in the gap can be fully utilized. At the same time, the terminal post 4 is partially inserted into the groove 55, which can reduce the overall height of the battery cell 20.
[0082] By providing a groove 55 in the first connection portion 52, which accommodates at least a portion of the pole post 4, the internal space of the battery cell 20 can be fully utilized, which helps to reduce the height of the battery cell 20.
[0083] In some embodiments, the shape of the groove 55 is adapted to the shape of the pole post 4, and the inner sidewall of the groove 55 abuts against the outer sidewall of the pole post 4.
[0084] In this embodiment, the groove 55 can also reduce the height of the battery cell 20. In addition, the shape of the groove 55 can be designed to match the shape of the terminal post 4. For example, if the terminal post 4 is cylindrical, then the groove 55 can also be cylindrical, allowing the terminal post 4 to extend into it. A second concave-convex structure 51 is provided on the side of the terminal post 4 facing the bottom of the groove. The diameter of the inner wall of the groove 55 can be slightly larger than the diameter of the outer wall of the terminal post 4. Simultaneously, the outer wall of the terminal post 4 and the inner wall of the groove 55 are either in contact or only slightly separated. Thus, the groove 55 can also serve a positioning function, facilitating the fitting of the first and second concave-convex structures 41 and 51, and also facilitating subsequent welding of the terminal post 4 to the adapter 5, preventing mutual movement during welding. It should be noted that... Figure 11 The groove 55 shown in the diagram is a circular groove, but it can actually be set as a square groove or other shapes depending on the shape of the pole post 4.
[0085] By setting the shape of the groove 55 to match the shape of the pole post 4, the pole post 4 can be positioned, which facilitates the fitting of the first concave-convex structure 41 and the second concave-convex structure 51, as well as the subsequent welding of the adapter 5 and the pole post 4.
[0086] Please refer to Figure 11 or Figure 12 In some embodiments, the second connecting portion 54 is disposed on both sides of the substrate 53 along a second direction, which is the length direction of the battery cell 20.
[0087] It should be noted that the number of second connecting parts 54 can be one or two. When there is one second connecting part 54, it is disposed on one side of the substrate 53 along the second direction. When there are two second connecting parts 54, they are disposed on both sides of the substrate 53 along the second direction. In this case, the number of bare cells 31 in a single battery cell 20 is also two. Generally, the end cover plate 2 is provided with an explosion-proof valve 7 and two pole posts 4 disposed on both sides of the explosion-proof valve 7 along the second direction. In the second direction, the tab 32 is disposed between the explosion-proof valve 7 and the pole post 4, which limits the width or area of the tab 32. The size of the tab 32 has a significant impact on the heat dissipation efficiency. Generally, the larger the width or area of the tab 32, the less Joule heat is generated, the greater the current carrying capacity, and the higher the heat dissipation efficiency. In this application, the tab 32 is disposed on the side of the substrate 53 along the second direction, so that the tab 32 is misaligned with the explosion-proof valve 7 and the pole post 4 in the second direction. To be precise, the tab 32 is offset relative to the explosion-proof valve 7 and the pole post 4 in the second direction, and the three are not on a straight line. Therefore, the design position and design space of the tab 32 are not limited to being disposed in the middle of the explosion-proof valve 7 and the pole post 4 along the second direction. This allows the size of the tab 32 to be made larger, which is beneficial to improving the heat conduction efficiency.
[0088] By placing the second connecting portion 54 on both sides of the substrate 53 along the second direction, the tab 32 can be offset from the explosion-proof valve 7 and the pole post 4 in the first direction, so that the tab 32 has more manufacturing space and can be made larger, which is beneficial to improving the current carrying capacity and heat conduction efficiency.
[0089] Please refer to Figure 12 In some embodiments, a positioning groove 56 is provided on the side of the first connecting part 52 away from the pole post 4, with a third direction as the projection direction, the projection of the positioning groove 56 covers the projection of the pole post 4, and the third direction is the height direction of the battery cell 20.
[0090] The side of the pole post 4 facing the first connecting part 52 is the first welding surface, and a first concave-convex structure 41 is provided on the first welding surface. The side of the first connecting part 52 facing the pole post 4 is the second welding surface, and a second concave-convex structure 51 is provided on the second welding surface. After the first welding surface and the second welding surface come into contact, the first concave-convex structure 41 and the second concave-convex structure 51 fit together, and then the pole post 4 and the adapter 5 are welded. The welding can be ultrasonic welding or laser welding. At this time, the welding equipment is used from the side of the adapter 5 away from the pole post 4. The positioning groove 56 is a recessed groove used to position the welding head of the welding equipment. The third direction is the height direction, which is also the thickness direction of the adapter 5. Along the projection of the third direction, the projection of the positioning groove 56 covers the projection of the pole post 4, or in other words, the projection of the pole post 4 is within the outer contour of the projection of the positioning groove 56. In this way, when the welding head is aligned with the positioning groove 56 for welding, the welding head can contact various positions on the first welding surface of the pole post 4, improving the reliability of the weld.
[0091] By setting a positioning groove 56 and making the projection of the positioning groove 56 cover the projection of the pole post 4, the welding head can be positioned easily, and the welding strength can be improved.
[0092] In some embodiments, the third welding surface of the second connecting portion 54 is provided with a third concave-convex structure, and the fourth welding surface of the electrode tab 32 is provided with a fourth concave-convex structure. The third concave-convex structure and the fourth concave-convex structure are fitted together, and the second connecting portion 54 and the electrode tab 32 are welded through the third welding surface and the fourth welding surface.
[0093] The third and fourth concave-convex structures can both be wavy, sawtooth, or triangular structures, similar to the design structure and concept of the first and second concave-convex structures 41 and 51. The design of the third and fourth concave-convex structures is also to increase the connection area between the tab 32 and the adapter 5, improve the current carrying capacity and heat conduction efficiency, and at the same time improve the resistance to shear force in the horizontal bonding direction and reduce the offset of the adapter 5.
[0094] By providing a third concave-convex structure on the second connecting part 54 and a fourth concave-convex structure on the tab 32, the third and fourth concave-convex structures fit together when the tab 32 contacts the second connecting part 54, which can improve the current carrying capacity and heat conduction efficiency of the battery cell 20.
[0095] In some embodiments, the second connecting portion 54 is provided with a slot on the side facing the tab 32, and a third concave-convex structure is provided at the bottom of the slot, with the tab 32 extending into the slot.
[0096] The tab 32 can extend into the slot from the slot opening, and the bottom of the slot is provided with a third concave-convex structure that fits into the fourth concave-convex structure on the tab 32.
[0097] By providing a slot on the second connecting part 54, a preliminary positioning function can be achieved, facilitating the connection between the second connecting part 54 and the tab 32.
[0098] According to some embodiments of this application, this application provides a battery cell 20, including a housing 1, an electrode assembly 3, an end cover plate 2, a plastic part 6, and an adapter 5. The housing 1 is provided with a receiving cavity. The electrode assembly 3 includes a bare cell 31 and a tab 32 disposed on the bare cell 31. The end cover plate 2 covers the opening of the housing 1 and is provided with a terminal post 4. A first concave-convex structure 41 is provided on the side of the terminal post 4 facing the receiving cavity. The adapter 5 includes a substrate 53 and a first connecting portion 52 and a second connecting portion 54 disposed on the substrate 53. The first connecting portion 52 is provided with the second concave-convex structure 51. The first concave-convex structure 41 and the second concave-convex structure 51 are fitted together. The second connecting portion 54 is connected to the tab 32. The first concave-convex structure 41 and the second concave-convex structure 51 can both be mutually cooperating wavy structures, sawtooth structures, or triangular structures. The adapter 5 is disposed on the plastic part 6. In a first direction, the distance between the outer edge of the adapter 5 and the outer edge of the plastic part 6 is 1mm to 2mm. In some specific embodiments, a groove 55 is provided on the side of the first connecting portion 52 facing the electrode post 4. A second concave-convex structure 51 is provided at the bottom of the groove 55. The shape of the groove 55 is adapted to the shape of the electrode post 4. The inner sidewall of the groove 55 abuts against the outer sidewall of the electrode post 4. The electrode post 4 extends into the groove 55, so that the first concave-convex structure 41 and the second concave-convex structure 51 fit together. A positioning groove 56 is provided on the side of the first connecting portion 52 away from the electrode post 4. With the third direction as the projection direction, the projection of the positioning groove 56 covers the projection of the electrode post 4. The second connecting portion 54 is provided on both sides of the substrate 53 along the second direction. This embodiment can improve the current carrying capacity and heat conduction efficiency of the battery cell 20.
[0099] According to some embodiments of this application, this application provides a battery device 100, which includes a housing 10 and a plurality of battery cells 20 disposed within the housing 10, wherein the battery cells 20 are as described above. Since the battery device 100 includes all the technical solutions of all embodiments of the aforementioned battery cells 20, it possesses at least all the beneficial effects brought about by all the aforementioned technical solutions, which will not be elaborated further here.
[0100] According to some embodiments of this application, this application provides an electrical device, which includes a housing and a battery device 100 as described above disposed in the housing. Since the electrical device includes all the technical solutions of all embodiments of the battery device 100 described above, it has at least all the beneficial effects brought by all the above technical solutions, and will not be repeated here.
[0101] The above description is merely an optional embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the content of the specification and drawings of this application under the concept of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.
Claims
1. A battery cell, characterized by, The battery monomer comprises: a shell provided with a containing cavity; an electrode assembly comprising a bare electrode core and a tab provided on the bare electrode core; an end cover plate covering an opening of the shell, the end cover plate being provided with a pole column, a first concave-convex structure being provided on a side of the pole column facing the containing cavity; an adapter comprising a base plate and a first connecting portion and a second connecting portion provided on the base plate, the first connecting portion being provided with a second concave-convex structure, the first concave-convex structure and the second concave-convex structure being mutually fitted, the second connecting portion being connected with the tab.
2. The battery cell of claim 1, wherein, The first concave-convex structure comprises a first wave structure, the first wave structure comprising a plurality of first wave crests and a plurality of first wave troughs arranged alternately and periodically, wherein two adjacent first wave crests are connected with a first wave trough, and two adjacent first wave troughs are connected with a first wave crest. The second concave-convex structure comprises a second wave structure, the second wave structure comprising a plurality of second wave crests and a plurality of second wave troughs arranged alternately and periodically, wherein two adjacent second wave crests are connected with a second wave trough, and two adjacent second wave troughs are connected with a second wave crest. The first wave crest is matched with the second wave trough, and the second wave crest is matched with the first wave trough, so that the first concave-convex structure and the second concave-convex structure are mutually fitted.
3. The battery cell of claim 1, wherein, The first concave-convex structure comprises a first sawtooth structure, the first sawtooth structure comprising a plurality of first tooth tips and a plurality of first tooth grooves arranged alternately and periodically, wherein two adjacent first tooth tips are connected with a first tooth groove, and two adjacent first tooth grooves are connected with a first tooth tip. The second concave-convex structure comprises a second sawtooth structure, the second sawtooth structure comprising a plurality of second tooth tips and a plurality of second tooth grooves arranged alternately and periodically, wherein two adjacent second tooth tips are connected with a second tooth groove, and two adjacent second tooth grooves are connected with a second tooth tip. The first tooth tip is matched with the second tooth groove, and the second tooth tip is matched with the first tooth groove, so that the first concave-convex structure and the second concave-convex structure are mutually fitted.
4. The battery cell of claim 1, wherein, The battery monomer further comprises a plastic part, the adapter being provided on the plastic part, in a first direction, a distance between an outer edge of the adapter and an outer edge of the plastic part being 1mm-2mm; the first direction being a width direction of the battery monomer.
5. The battery cell of claim 1, wherein, A side of the first connecting portion facing the pole column is provided with a groove, a groove bottom of the groove being provided with the second concave-convex structure, the pole column extending into the groove, so that the first concave-convex structure and the second concave-convex structure are mutually fitted.
6. The battery cell of claim 5, wherein, A shape of the groove is matched with a shape of the pole column, and an inner side wall of the groove abuts against an outer side wall of the pole column.
7. The battery cell of claim 1, wherein, The second connecting portion is provided on both sides of the base plate along a second direction, the second direction being a length direction of the battery monomer.
8. The battery cell of claim 1, wherein, The first connecting part is provided with a positioning groove on the side away from the pole column, a third direction is a projection direction, a projection of the positioning groove covers a projection of the pole column, and the third direction is a height direction of the battery monomer.
9. The battery cell of any one of claims 1 to 8, wherein, The third welding surface of the second connecting part is provided with a third concave-convex structure, the fourth welding surface of the tab is provided with a fourth concave-convex structure, the third concave-convex structure is arranged in close contact with the fourth concave-convex structure, and the second connecting part and the tab are welded through the third welding surface and the fourth welding surface.
10. The battery cell of claim 9, wherein, The second connecting part is provided with a clamping groove on the side facing the tab, the third concave-convex structure is arranged on the groove bottom of the clamping groove, and the tab extends into the clamping groove.
11. A battery device characterized by comprising: The battery device comprises a box body and a plurality of battery monomers arranged in the box body, and the battery monomer is the battery monomer in any one of claims 1 to 10.
12. An electrical device, characterized by The electric equipment comprises a shell and the battery device as claimed in claim 11 arranged in the shell.