Cover plate assembly and electric appliance
By setting an insulating protective structure in the power battery cover assembly, the short circuit problem caused by welding slag piercing the separator was solved, the welding slag containment and connection strength were improved, and the reliability and safety of the battery were enhanced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SVOLT ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-08-22
- Publication Date
- 2026-07-24
AI Technical Summary
During the welding process between the tabs and terminals of a power battery, welding slag may puncture the separator, causing a short circuit and affecting the battery's reliability and safety.
A cover plate assembly was designed, including a cover plate and an insulating protective structure. The insulating protective structure is insulated from the cover plate by its body and is positioned between the electrode group and the electrode post by its protective part. A cavity is provided to accommodate welding slag and prevent welding slag from falling off. It is formed by injection molding to enhance the connection strength and stability.
It effectively prevents welding slag from puncturing the separator, reduces the risk of short circuits, improves the reliability and safety of power batteries, simplifies the manufacturing process, reduces costs, and improves assembly efficiency and structural stability.
Smart Images
Figure CN224554462U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of power battery technology, and in particular to a cover plate assembly and electrical equipment. Background Technology
[0002] The structure of a power battery mainly consists of four key components: the casing, the electrode assembly, the cover plate, and the terminals. The terminals are fixed to the cover plate, forming the external electrical connection interface of the battery; the electrode assembly is housed inside the casing; and the cover plate is sealed at the opening of the casing using processes such as laser welding, ensuring the airtightness of the battery's internal environment. During battery assembly, the tabs of the electrode assembly need to be connected to the terminals by welding to establish a complete current path.
[0003] However, welding slag particles may form during the welding process between the tabs and the terminals. If this slag falls into the electrode assembly and comes into contact with the separator, it may puncture the separator, causing the positive and negative electrodes to connect and short-circuit. In severe cases, this can lead to thermal runaway of the power battery, negatively impacting its reliability. Utility Model Content
[0004] In view of this, this application aims to provide a cover assembly to improve the reliability of power batteries.
[0005] To achieve the above objectives, the technical solution of this application is implemented as follows: A cover plate assembly includes a cover plate and an insulating protective structure disposed on one side of the cover plate in the thickness direction; The cover plate is long and narrow, and pole posts are inserted at both ends of the cover plate near its own length direction. Each pole post is used to be welded to the pole lug in the pole group. The insulating protective structure includes a body portion disposed on one side of the cover plate in the thickness direction, and protective portions located at both ends of the body portion along the length direction of the cover plate. The main body can insulate each of the poles from the cover plate; the protective parts at both ends can be snapped into the main body and at least blocked at the poles at the corresponding ends. The middle part of each of the protective portions protrudes along the thickness direction of the cover plate toward the side away from the cover plate, thereby forming a cavity.
[0006] Furthermore, each of the protective parts is connected to the main body part through a bending portion, and each of the protective parts, each of the bending portions, and the main body part are integrally formed by injection molding.
[0007] Furthermore, the main body portion is conformally disposed to the cover plate, and along the width direction of the cover plate, the bent portion is located in the middle of the protective portion.
[0008] Furthermore, the main body is provided with a buckle, and the protective part is provided with a locking hole. The buckle is placed in the locking hole, which enables the main body and the protective part to be connected.
[0009] Furthermore, the buckle includes a snap-fit portion and a connecting portion for connecting the snap-fit portion to the main body portion; The card slot includes a first card slot and a second card slot that are connected to each other. The diameter of the first card slot is smaller than the diameter of the second card slot. The connecting part is embedded in the first card slot, and the snap-fit part is snap-fitted in the second card slot.
[0010] Furthermore, the buckle includes multiple sub-buckles, which are spaced apart around the center line of the buckle; Furthermore, each of the aforementioned snap fasteners includes a snap fastening portion that snaps into the second snap hole, and a snap connecting portion that connects the snap fastening portion to the main body portion; The multiple sub-connecting parts together constitute the connecting part, and the multiple sub-connecting parts together constitute the connecting part.
[0011] Furthermore, the spacing W between adjacent snap fasteners is between 1.2 mm and 1.8 mm.
[0012] Furthermore, the engagement length W1 of the snap-fit part is between 0.35 mm and 0.65 mm.
[0013] Furthermore, the thickness W2 of the connecting portion is between 0.4 mm and 1.2 mm.
[0014] Furthermore, the height H of the connecting part is between 0.55 mm and 2.8 mm.
[0015] Furthermore, the thickness h of the first card hole portion on the protective part is between 0.8 mm and 2.2 mm.
[0016] Furthermore, each of the protective portions has multiple through holes at the connection between the middle and the edge, and the multiple through holes are arranged circumferentially around the cavity.
[0017] Compared with the prior art, this application has the following advantages: (1) The cover plate assembly described in this application, by setting a cover plate and an insulating protective structure, the main body of the insulating protective structure insulates the terminal post from the cover plate to prevent short circuit risk. The protective part is placed between the terminal group and the terminal post, which can block the welding slag generated during the welding process of the terminal tab and the terminal post, reducing the risk of welding slag piercing the terminal group diaphragm. At the same time, a cavity is set in the middle of the protective part to accommodate the welding slag generated during the welding process, further preventing the welding slag from falling into the terminal group and causing a short circuit, which is beneficial to improving the reliability of the power battery.
[0018] (2) The protective part is connected to the main body through the bending part and is molded into one piece by injection molding, which simplifies the manufacturing process and reduces the assembly process. At the same time, the one-piece molded structure enhances the connection strength between the protective part, the bending part and the main body, making the insulation protection structure more robust and less prone to damage, which is conducive to ensuring the long-term stable performance of the insulation protection structure.
[0019] (3) The main body is set to conform to the shape of the cover plate, and the bent part is located in the middle of the protective part in the width direction of the cover plate. This layout allows the insulating protective structure to better fit the shape of the cover plate and improve the space utilization. At the same time, the reasonable position distribution helps to evenly disperse the external force and avoid local stress concentration, further improving the stability and reliability of the overall structure.
[0020] (4) The buckles on the main body and the buckles on the protective part cooperate to achieve snap-fit, which facilitates the installation and disassembly of the insulation protection structure, facilitates the assembly and debugging during the production process and the maintenance and repair in the later stage. Moreover, the snap-fit structure reduces the number of parts, lowers the cost, and improves the assembly efficiency compared with other connection methods (such as bolt connection) while ensuring the connection strength.
[0021] (5) The snap-fit part of the buckle is connected to the main body part through the connecting part. The snap-fit hole adopts the design of the first snap-fit hole and the second snap-fit hole being connected and having different hole diameters, so that the buckle can be firmly snapped into the snap-fit hole. The connecting part is embedded in the first snap-fit hole, and the snap-fit part is snapped into the second snap-fit hole, forming a stepped snap-fit structure, which effectively prevents the buckle from loosening or falling out, and enhances the tightness and stability of the connection between the main body part and the protective part, so that the insulation protection structure can adapt to more working conditions.
[0022] (6) The buckle includes multiple sub-buckles, each of which includes a sub-buckle engagement part and a sub-connecting part. The multiple sub-buckle engagement parts together constitute the engagement part, and the multiple sub-connecting parts together constitute the connecting part. When the buckle is placed in the buckle hole, the multiple sub-buckle engagement parts shift together towards the center line of the buckle, so that the buckle hole can be smoothly engaged in the buckle hole. The buckling process is convenient. After the buckling is completed, each sub-buckle engagement part resets under the action of its respective sub-connecting part, so that the buckle can be firmly engaged in the buckle hole. The buckling reliability and stability are high.
[0023] (7) The spacing between adjacent snaps, the snap-fit length of the snap-fit part and the thickness of the connecting part are set within a reasonable range. After optimization design, it can ensure sufficient connection strength while avoiding assembly difficulties or material waste caused by unreasonable size. At the same time, the appropriate size parameters make the fit between the snap and the snap hole more precise, ensuring the stability and reliability of the snap-fit structure and improving the consistency and quality stability of the product.
[0024] (8) The height of the connecting part and the thickness of the part with the first locking hole in the protective part are within the specified range, which can ensure the fitting accuracy and connection strength between the buckle and the locking hole. The appropriate height and thickness parameters can provide sufficient friction and locking force when the buckle is inserted into the locking hole to prevent loosening, while ensuring that the protective part still has sufficient strength and rigidity after the buckle is installed.
[0025] (9) Multiple through holes are arranged circumferentially around the cavity at the connection between the middle and edge of the protective part. On the one hand, this can reduce the weight of the protective part and reduce material costs; on the other hand, the presence of through holes helps the electrolyte to flow; in addition, through holes can also release stress to a certain extent, reduce the possibility of deformation or damage to the protective part due to thermal expansion and contraction or external force, and improve the structural stability of the protective part.
[0026] Another objective of this application is to provide an electrical device in which the aforementioned cover assembly is applied to the power battery.
[0027] The electrical equipment described in this application, by using a power battery with the aforementioned cover plate assembly, reduces the risk of welding slag falling into the electrode assembly, thereby reducing the possibility of internal short circuits in the battery. This helps ensure the normal operation of the electrical equipment, improves the safety and reliability of the power battery, and enhances the reliability of the electrical equipment and the user experience. Attached Figure Description
[0028] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is an exemplary structural diagram of the cover plate assembly described in the embodiments of this application in an application state; Figure 2 for Figure 1 Top view; Figure 3 for Figure 2 Sectional view at point AA; Figure 4 for Figure 3 A magnified view of part C in the middle; Figure 5 for Figure 3 Enlarged view of part D in the middle Figure 6 This is a schematic diagram of an exemplary structure of the buckle described in an embodiment of this application; Figure 7 This is a schematic diagram of an exemplary structure of the card slot described in an embodiment of this application; Figure 8 for Figure 2 Sectional view at point BB; Figure 9 for Figure 8 A magnified view of part E in the middle; Figure 10 This is an exemplary structural diagram of the insulation protection structure described in the embodiments of this application; Figure 11 for Figure 10 A magnified view of part F in the middle; Figure 12 for Figure 10 Another perspective; Figure 13 for Figure 12 A magnified view of part G in the middle; Figure 14 for Figure 12 Enlarged view of part J in the middle Figure 15 This is an exemplary structural diagram of the cover plate assembly and pole group assembly according to an embodiment of this application; Figure 16 for Figure 15 A schematic diagram of the structure in which the protective section bends to one side of the main body; Explanation of reference numerals in the attached figures: 1. Cover plate; 2. Pole post; 3. Pole group; 301. Electrode; 4. Main body part; 401, Buckle; 4011, Snap-fit part; 4012, Connecting part; 4013, Sub-buckle; 40131, Sub-buckle part; 40132, Sub-connecting part; 4014, Guide part; 402, Mounting groove; 403, Pressure relief hole; 5. Protected section; 501, cavity; 502, locking hole; 5021, first locking hole; 5022, second locking hole; 503, through hole; 504, protrusion; 6. The bent part; 601. Glue Reduction Tank; 7. Explosion-proof valve. Detailed Implementation
[0029] To make the technical solution and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.
[0030] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.
[0031] Furthermore, it should be noted that in the description of this application, if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, these are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0032] Furthermore, in the description of this application, unless otherwise expressly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application in light of the specific circumstances.
[0033] In this application, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0034] The present application will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.
[0035] An embodiment of the first aspect of this application provides a cover assembly to reduce the short-circuit risk of a power battery and improve its safety.
[0036] In related technologies, the welding process between the tabs and the cover plate plays a crucial role in the battery manufacturing process, and is one of the core links that determines the final quality of the battery. The welding quality of this process is closely and directly related to the safety and electrochemical performance of the battery, and its quality plays a decisive role in whether the battery can operate stably and safely in complex and changing usage environments.
[0037] A deep analysis at the microscopic level of the battery reveals that the separator, as a key functional component for effectively isolating the positive and negative electrodes, is crucial for the safe and stable operation of the battery due to its material properties and structural integrity. Separators are typically made of insulating materials with specific porosity and mechanical strength. Their function is to strictly prevent direct contact between the positive and negative electrodes while ensuring normal ion transport, thereby maintaining the orderly conduct of electrochemical reactions within the battery.
[0038] However, during the welding process of the electrode tab and the cover plate, welding slag is easily generated at the welding site due to factors such as slight fluctuations in welding process parameters (e.g., welding current, welding time, welding pressure), precision deviations of welding equipment, and differences in the skill level of operators. The morphology, size, and distribution of these welding slags are uncertain, and they may exist in the welding area as tiny particles, flakes, or irregular shapes.
[0039] During subsequent assembly, transportation, or use of the battery, if it detaches or shifts due to factors such as minor internal vibrations, stress changes, or external impacts, welding slag is highly likely to cause physical puncture damage to the separator. Once the separator is punctured by welding slag, the isolation between the positive and negative electrodes maintained by the separator will be broken, and the positive and negative electrodes will directly make electrical contact, thus causing a short circuit fault.
[0040] When a short circuit occurs, an extremely large short-circuit current flows through the battery in a very short time. This massive current rapidly generates a large amount of heat due to the battery's internal resistance, causing a sharp rise in the battery's internal temperature. This high-temperature environment triggers a series of complex chain chemical reactions within the battery. First, the electrolyte inside the battery decomposes under high temperatures. Electrolytes are typically composed of organic solvents, lithium salts, and other components, and their decomposition products may include gases (such as carbon dioxide, carbon monoxide, and hydrogen), solid particles, and corrosive chemicals. The decomposition of the electrolyte not only alters the battery's internal chemical balance, leading to a decrease in its electrochemical performance, but the generated gases also cause a sharp increase in internal pressure, increasing the risk of bulging, deformation, or even rupture of the battery.
[0041] At the same time, the positive and negative electrode materials of the battery will also decompose under high temperature conditions. Positive electrode materials (such as lithium cobalt oxide, lithium manganese oxide, lithium iron phosphate, etc.) and negative electrode materials (such as graphite, silicon-based materials, etc.) will undergo structural phase transitions and redox reactions at high temperatures, which will lead to the destruction of the crystal structure of the electrode materials and the loss of active materials, thereby causing irreversible capacity decay and deterioration of charge and discharge performance.
[0042] As the aforementioned chain chemical reaction continues, the internal temperature of the battery will continue to rise, potentially leading to thermal runaway. Thermal runaway is a highly destructive battery failure mode, characterized by a rapid increase in internal temperature and pressure, which can cause the battery casing to rupture, burn, or even explode. Thermal runaway not only completely destroys the battery, rendering it unusable, but the flames, high temperatures from combustion, and the shockwaves and debris from an explosion can also cause severe damage to surrounding infrastructure and pose a direct threat to the lives of operators and those nearby.
[0043] In view of this, in order to overcome the shortcomings of the related technology, the cover plate assembly of this embodiment combines... Figures 1 to 10 As shown, the overall design includes a cover plate 1 and an insulating protective structure located on one side of the cover plate 1 in the thickness direction.
[0044] The cover plate 1 is elongated, and pole posts 2 are inserted at both ends of the cover plate 1 near its length. Each pole post 2 is used to weld to the tabs 301 in the pole group 3. The insulating protection structure includes a body portion 4 located on one side of the cover plate 1 in the thickness direction, and protective portions 5 located at both ends of the body portion 4 along the length direction of the cover plate 1. The body portion 4 can insulate each pole post 2 from the cover plate 1. The protective portions 5 at both ends can be snapped into the body portion 4, and at least block the pole post 2 at the corresponding end. The middle part of each protective portion 5 protrudes along the thickness direction of the cover plate 1 towards the side away from the cover plate 1, thereby forming a cavity 501.
[0045] Therefore, by setting up a cover plate 1 and an insulating protective structure, the main body 4 of the insulating protective structure insulates the terminal post 2 from the cover plate 1, preventing the risk of short circuit. The protective part 5 is placed between the electrode group 3 and the terminal post 2, which can block the welding slag generated during the welding process of the electrode tab 301 and the terminal post 2, reducing the risk of welding slag piercing the separator of the electrode group 3. At the same time, a cavity 501 is set in the middle of the protective part 5, which can accommodate the welding slag generated during the welding process, further preventing the welding slag from falling into the electrode group 3 and causing a short circuit, which is beneficial to improving the reliability of the power battery.
[0046] To better understand the cover assembly of this embodiment, the structure of the power battery will first be briefly described. Generally speaking, a power battery includes a battery casing and an electrode assembly 3 located within the battery casing. The electrode assembly 3 includes a positive electrode, a negative electrode, and a separator sandwiched between the positive and negative electrode. The battery casing generally includes a casing body with a receiving cavity open on one side. The electrode assembly seals one side of the opening, forming a sealed receiving cavity, and the aforementioned electrode assembly 3 is located within the receiving cavity.
[0047] Based on the above overview, specifically, after the protective part 5 is engaged with the main body part 4, it can block the tabs 301 on the side facing away from the cover plate 1. Because the protective part 5 is located at both ends of the main body part 4, a single insulating protective structure can block the two tabs 301 of one pole group 3, or it can block the four tabs 301 of two pole groups 3. The number of cavities 501 is the same as the number of tabs 301, that is, each cavity 501 corresponds to a welding point between a tab 301 and a pole post 2. When a single insulating protective structure blocks the four tabs 301 of two pole groups 3, the tabs 301 of the two pole groups 3 can be connected to the corresponding pole posts 2 from both sides in the width direction of the cover plate 1.
[0048] It should be noted that the electrode post 2 and the cover plate 1 are insulated from each other. The specific structure of the electrode post 2 and the installation method of the electrode post 2 on the cover plate 1 shall refer to the existing structure. The structure of the body part 4 can refer to the existing lower plastic structure, which is used to insulate the electrode post 2 and the cover plate 1, and the connection method between the body part 4 and the cover plate 1 shall still refer to the existing technology.
[0049] Continue to combine Figures 1 to 10 As shown, in some exemplary embodiments, each protective part 5 is connected to the body part 4 via a bending part 6, and each protective part 5, each bending part 6, and the body part 4 are integrally formed by injection molding.
[0050] In this way, the protective part 5 is connected to the main body part 4 through the bent part 6 and is molded into one piece by injection molding, which simplifies the manufacturing process and reduces the assembly steps. At the same time, the one-piece molded structure enhances the connection strength between the protective part 5, the bent part 6 and the main body part 4, making the insulation protection structure more robust and less prone to damage, which is conducive to ensuring the long-term stable performance of the protective function of the insulation protection structure.
[0051] Based on the integral molding of the protective portion 5, the bent portion 6 and the body portion 4, in some exemplary embodiments, the body portion 4 is conformally disposed to the cover plate 1, and the bent portion 6 is located in the middle of the protective portion 5 along the width direction of the cover plate 1.
[0052] In this way, the main body 4 is set to conform to the shape of the cover plate 1, and the bent part 6 is located in the middle of the protective part 5 in the width direction of the cover plate 1. This layout allows the insulating protective structure to better fit the shape of the cover plate 1, improves space utilization, and at the same time, the reasonable position distribution helps to evenly disperse external forces, avoid local stress concentration, and further improve the stability and reliability of the overall structure.
[0053] Preferably, in the width direction of the cover plate 1, the size of the bent portion 6 is smaller than the size of the protective portion 5, which can reduce the size of the connection between the main body portion 4 and the protective portion, save materials, and facilitate bending the protective portion 5 towards the main body portion 4, thereby reducing bending resistance.
[0054] See Figures 5 to 7 , Figure 10 , Figure 11 As shown, in some exemplary embodiments, the main body 4 is provided with a buckle 401 and the protective part 5 is provided with a snap hole 502. The buckle 401 is snapped into the snap hole 502, so that the main body 4 and the protective part 5 can be snapped together.
[0055] With this configuration, the buckle 401 on the main body 4 and the snap hole 502 on the protective part 5 cooperate to achieve snap-fit, which facilitates the installation and disassembly of the insulation protection structure, and makes it convenient for assembly and debugging during the production process as well as subsequent maintenance and repair. Moreover, while ensuring connection strength, the snap-fit structure reduces the number of parts, lowers costs, and improves assembly efficiency compared to other connection methods (such as bolt connection).
[0056] For ease of description, this embodiment refers to a snap-fit structure as a set of snap-fit structures, where a snap-fit 401 and its corresponding snap-fit hole 502 are provided between the protective part 5 and the main body part 4. Of course, the more sets of snap-fit structures are provided, the more secure the snap-fit will be, but this will increase manufacturing costs and assembly time.
[0057] Continuing with the existing fastener 401 on the main body portion 4 and the locking hole 502 on the protective portion 5, in some exemplary embodiments, the fastener 401 includes a locking portion 4011 and a connecting portion 4012 connecting the locking portion 4011 to the main body portion 4. The locking hole 502 includes a first locking hole 5021 and a second locking hole 5022 that are connected. The diameter of the first locking hole 5021 is smaller than the diameter of the second locking hole 5022, and the connecting portion 4012 is embedded in the first locking hole 5021, while the locking portion 4011 is locked in the second locking hole 5022. After the fastener 401 is inserted into the locking hole 502, it does not protrude beyond the opening of the second locking hole 5022 to prevent the fastener 401 from scratching the tab 301.
[0058] In this arrangement, the snap-fit part 4011 of the buckle 401 is connected to the main body part 4 through the connecting part 4012. The snap hole 502 adopts a design in which the first snap hole 5021 and the second snap hole 5022 are connected and have different diameters, so that the buckle 401 can be firmly snapped into the snap hole 502. The connecting part 4012 is embedded in the first snap hole 5021, and the snap-fit part 4011 is snapped into the second snap hole 5022, forming a stepped snap-fit structure, which effectively prevents the buckle 401 from loosening or falling out, enhances the tightness and stability of the connection between the main body part 4 and the protective part 5, and enables the insulation protection structure to adapt to more working conditions.
[0059] For example, in one embodiment, the cross-sections of the first locking hole 5021 and the second locking hole 5022 are both circular, as are the cross-sectional shapes of the connecting part 4012 and the locking part 4011. In the above structure, the buckle 401 includes the locking part 4011 and the connecting part 4012, while the locking hole 502 includes the first locking hole 5021 and the second locking hole 5022 with different diameters. The connecting part 4012 is embedded in the first locking hole 5021, and the locking part 4011 is locked in the second locking hole 5022, allowing the buckle 401 to be securely fixed in the locking hole 502, thus improving the reliability of the connection between the main body part 4 and the protective part 5.
[0060] Based on the snap fastener 401 including the snap-fit portion 4011 and the connecting portion 4012, in some exemplary embodiments, the snap fastener 401 includes a plurality of sub-snap fasteners 4013, which are spaced apart around the center line of the snap fastener 401. Each sub-snap fastener 4013 includes a sub-snap-fit portion 40132 that snaps into the second snap hole 5022, and a sub-connecting portion 40132 that connects the sub-snap-fit portion 40132 to the main body portion 4. The plurality of sub-snap-fit portions 40132 together constitute the snap-fit portion 4011, and the plurality of sub-connecting portions 40132 together constitute the connecting portion 4012.
[0061] As configured above, the buckle 401 includes multiple sub-buckles 4013, each sub-buckle 4013 including a sub-buckle engagement portion 40132 and a sub-connecting portion 40132. The multiple sub-buckle engagement portions 40132 together constitute a snap engagement portion 4011, and the multiple sub-connecting portions 40132 together constitute a connecting portion 4012. When the buckle 401 is snapped into the snap hole 502, the multiple sub-buckle engagement portions 40132 are offset together towards the center line of the buckle 401, so that the snap hole 502 can be smoothly snapped into the snap hole 502. The snapping process is convenient, and after the snapping is completed, each sub-buckle engagement portion 40132 is reset under the action of its respective sub-connecting portion 40132, so that the buckle 401 can be firmly snapped into the snap hole 502. The reliability and stability of the snapping are high.
[0062] It should be noted that when the buckle 401 is engaged in the hole 502, the center line of the buckle 401 is collinear with the axial center line of the hole 502. In some examples, there are four sub-buckles 4013, and the engaging part 4011 of each sub-buckle 4013 is fan-shaped with a central angle of 90°, and the connecting part 4012 of each sub-buckle 4013 is also fan-shaped with a central angle of 90°.
[0063] It is worth mentioning that, in order to facilitate the snap fastener 401 being inserted into the snap hole 502, in a preferred embodiment, the end of the snap-fit portion 4011 that is first inserted into the snap hole 502 is provided with a guide portion 4014, which is used to guide the snap fastener 401 into the snap hole 502. In a specific implementation, the guide portion 4014 can be a chamfer provided on the edge of the snap-fit portion 4011 to facilitate the smooth insertion of the snap fastener 401 into the snap hole 502. For example, in one possible implementation, the edge of each sub-snap fastener 4013 away from the main body portion 4 is provided with a chamfer, which helps to increase the speed at which the snap fastener 401 is inserted into the snap hole 502.
[0064] For the specific structural dimensions of buckle 401 and slot 502, refer to Figure 11 As shown, in some exemplary embodiments, the spacing W between adjacent snap fasteners 4013 is between 1.2 mm and 1.8 mm, such as 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, etc. This allows for material savings while ensuring sufficient strength in the snap fasteners 4013.
[0065] Secondly, the engagement length W1 of the snap-fit part 4011 is between 0.35 mm and 0.65 mm, such as 0.35 mm, 0.45 mm, 0.55 mm, 0.65 mm, etc. The engagement length of the snap-fit part 4011 is the radial dimension on one side of the contact surface between the snap-fit part 4011 and the protective part 5. Setting the engagement length of the snap-fit part 4011 in this way allows the snap-fit part 4011 to securely engage the protective part 5 while saving material usage.
[0066] Furthermore, the thickness W2 of the connecting part 4012 is between 0.4 mm and 1.2 mm, such as 0.4 mm, 0.6 mm, 0.8 mm, 1 mm, 1.2 mm, etc. The thickness of the connecting part 4012 is its radial dimension. Setting the thickness of the connecting part 4012 in this way makes the snap-fit operation easier while giving the connecting part 4012 good structural strength.
[0067] Furthermore, the height H of the connecting part 4012 is between 0.55 mm and 2.8 mm, such as 0.55 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 2.8 mm, etc. This setting makes the snap-fit operation easier while the connecting part 4012 has good structural strength.
[0068] In addition, the thickness h of the portion of the protective part 5 with the first locking hole 5021 is between 0.8 mm and 2.2 mm, such as 0.8 mm, 1.4 mm, 1.8 mm, 2.2 mm, etc., and the value of h needs to ensure that the buckle 401 can be smoothly engaged. In this way, the protective part 5 can provide better connection strength for the buckle 401.
[0069] Correspondingly, the diameter φ of the first card hole 5021 is between 1.6mm and 3mm, such as 1.6mm, 2mm, 2.4mm, 2.6mm, 3mm, etc., and the value of φ must ensure that the buckle 401 can be smoothly inserted, so that the protection part 5 can provide good connection strength to the buckle 401.
[0070] For example, refer to Figures 5 to 10 As shown, a protrusion 504 can be provided in the protective part 5, with the protrusion 504 facing the main body part 4. After the protective part 5 and the main body part 4 are engaged, the protrusion 504 abuts against the main body part 4 to limit the minimum distance between the protective part 5 and the main body part 4. A locking hole 502 can be provided on the protrusion 504 and penetrate through the protective part 5.
[0071] Reference Figure 9 and Figure 10 As shown, in some exemplary embodiments, the connection between the middle and the edge of each protective part 5 is provided with a plurality of through holes 503, and the plurality of through holes 503 are arranged circumferentially around the cavity 501.
[0072] This arrangement, with multiple circumferentially spaced through-holes 503 at the connection between the center and edge of the protective part 5, reduces the weight of the protective part 5 and lowers material costs. Furthermore, the through-holes 503 facilitate electrolyte flow. Additionally, the through-holes 503 can release stress to some extent, reducing the likelihood of deformation or damage to the protective part 5 due to thermal expansion and contraction or external forces, thus improving the structural stability of the protective part 5.
[0073] Regarding the specific structure of the cavity 501, for example, a frustum-shaped cavity 501 can be adopted, with the cavity 501 having an flared opening. Multiple through holes 503 are spaced around the edge of the cavity 501 opening. There is a gap between the through holes 503 and the bottom of the cavity 501; this arrangement is to allow the cavity 501 to effectively retain welding slag, further preventing the welding slag formed by welding the tab 301 and the electrode post 2 from piercing the diaphragm in the electrode assembly 3.
[0074] Reference Figure 12 and Figure 13 As shown, in a preferred embodiment, at least one side of the bent portion 6 is provided with a glue-reducing groove 601. The bent portion 6 extends along the width direction of the cover plate 1, and the glue-reducing groove 601 is provided on one side of the bent portion 6 and extends along the extension direction of the bent portion 6, which facilitates smooth bending of the bent portion. It should be understood that, in addition, it is also possible to provide a glue-reducing groove 601 only on the other side of the bent portion 6, or to provide a glue-reducing groove 601 on both sides of the bent portion 6.
[0075] Reference Figure 12 and Figure 14 As shown, in a preferred embodiment, the main body 4 is provided with a mounting groove 402, which is recessed away from the cover plate 1. The mounting groove 402 provides installation space for the explosion-proof valve 7, and a pressure relief hole 403 is provided on the groove wall of the mounting groove 402. The pressure relief hole 403 connects the mounting groove 402 to the inside of the power battery to provide a pressure relief channel. The number and size of the pressure relief holes 403 can be selected according to the actual situation, and it is necessary to ensure sufficient pressure relief capacity.
[0076] To better understand the assembly process of the cover plate assembly in this embodiment, for example... Figure 15 As shown, the tabs 301 of the two pole groups 3 are welded together with the pole post 2, and the main body 4 is connected to the cover plate 1. This is a schematic diagram of the structure of the protective part 5 before bending. And as... Figure 16 The diagram shows a structure where both protective parts 5 are bent to one side of the main body 4, blocking the opposite side of the cover plate 1 of the corresponding tab 301. Figure 1 The state shown is Figure 15 A schematic diagram of the structure of the middle electrode 301 after it is bent 90 degrees relative to the electrode group 3.
[0077] The material for the insulating protective structure can refer to existing plastic materials, such as polypropylene (PP). Because polypropylene has excellent electrical insulation and impact resistance, it can not only effectively insulate the cover plate 1 from the pole post 2, but also utilize its excellent elasticity to make the snap-fit operation smoother.
[0078] It is worth noting that, regarding the cover plate assembly of this embodiment, based on the above exemplary embodiments, in specific implementation, as a preferred embodiment, it is still composed of... Figures 1 to 16 As shown, it may include, for example, a cover plate 1, an electrode post 2, and an insulating protective structure.
[0079] The insulating protective structure includes an integrally molded body part 4, a bent part 6, and a protective part 5, which are made of polypropylene. The protective part 5 has a cavity 501 corresponding to the electrode tab 301 of the stage group.
[0080] The main body 4 is provided with a buckle 401, and the protective part 5 is provided with a card hole 502. The main body 4 and the protective part 5 are connected in technology.
[0081] In the preferred embodiment of the above cover plate assembly, the specific settings and arrangements of the cover plate 1, pole post 2, insulation protection structure, etc. can still be referred to the descriptions in the above exemplary embodiments. Furthermore, in this preferred embodiment, the beneficial effects brought about by the design of the cover plate 1, pole post 2, insulation protection structure, etc. can also be referred to the descriptions in the above exemplary embodiments.
[0082] The cover plate assembly of this embodiment adopts the above design. By setting the cover plate 1 and the insulating protection structure, the main body part 4 of the insulating protection structure insulates the terminal post 2 from the cover plate 1 to prevent short circuit risk. The protection part 5 is placed between the terminal group 3 and the terminal post 2, which can block the welding slag generated during the welding process of the electrode tab 301 and the terminal post 2, reducing the risk of welding slag piercing the separator of the terminal group 3. At the same time, a cavity 501 is set in the middle of the protection part 5 to accommodate the welding slag generated during the welding process, further preventing the welding slag from falling into the terminal group 3 and causing a short circuit, which is beneficial to improving the reliability of the power battery.
[0083] An embodiment of the second aspect of this application provides an electrical device in which the cover plate assembly of the first aspect of this application is applied to the power battery.
[0084] The electrical equipment in this embodiment, by using a power battery with the aforementioned cover plate assembly, reduces the risk of welding slag falling into the electrode group 3, thereby reducing the possibility of internal short circuits in the battery. This helps ensure the normal operation of the electrical equipment, improves the safety and reliability of the power battery, and enhances the reliability of the electrical equipment and the user experience.
[0085] The above descriptions are merely some embodiments of this application and are not intended to limit this application. The technical features or structures in the foregoing different embodiments can be arbitrarily combined to form other specific technical solutions as needed. For those skilled in the art, this application can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of the claims of this application.
Claims
1. A cover plate assembly, characterized in that: Includes a cover plate and an insulating protective structure disposed on one side of the cover plate in the thickness direction; The cover plate is long and narrow, and pole posts are inserted at both ends of the cover plate near its own length direction. Each pole post is used to be welded to the pole lug in the pole group. The insulating protective structure includes a body portion disposed on one side of the cover plate in the thickness direction, and protective portions located at both ends of the body portion along the length direction of the cover plate. The main body can insulate each of the poles from the cover plate; the protective parts at both ends can be snapped into the main body and at least blocked at the poles at the corresponding ends. The middle part of each of the protective portions protrudes along the thickness direction of the cover plate toward the side away from the cover plate, thereby forming a cavity.
2. The cover plate assembly according to claim 1, characterized in that: Each of the protective parts is connected to the main body part through a bending portion, and each of the protective parts, each of the bending portions, and the main body part are integrally formed by injection molding.
3. The cover plate assembly according to claim 2, characterized in that: The main body portion is shaped to conform to the cover plate, and the bent portion is located in the middle of the protective portion along the width direction of the cover plate.
4. The cover plate assembly according to claim 1, characterized in that: The main body is provided with a buckle, and the protective part is provided with a locking hole. The buckle is placed in the locking hole, so that the main body and the protective part can be locked together.
5. The cover plate assembly according to claim 4, characterized in that: The buckle includes a snap-fit portion and a connecting portion that connects the snap-fit portion to the main body portion; The card slot includes a first card slot and a second card slot that are connected to each other. The diameter of the first card slot is smaller than the diameter of the second card slot. The connecting part is embedded in the first card slot, and the snap-fit part is snap-fitted in the second card slot.
6. The cover plate assembly according to claim 5, characterized in that: The buckle includes multiple sub-buckles, which are spaced apart around the center line of the buckle. Furthermore, each of the aforementioned snap fasteners includes a snap fastening portion that snaps into the second snap hole, and a snap connecting portion that connects the snap fastening portion to the main body portion; The multiple sub-connecting parts together constitute the connecting part, and the multiple sub-connecting parts together constitute the connecting part.
7. The cover plate assembly according to claim 6, characterized in that: The spacing W between adjacent snap fasteners is between 1.2 mm and 1.8 mm; and / or, The engagement length W1 of the snap-fit part is between 0.35 mm and 0.65 mm; and / or, The thickness W2 of the connecting part is between 0.4 mm and 1.2 mm.
8. The cover plate assembly according to claim 5, characterized in that: The height H of the connecting part is between 0.55 mm and 2.8 mm; and / or, The thickness h of the first card hole portion on the protective part is between 0.8 mm and 2.2 mm.
9. The cover plate assembly according to any one of claims 1-8, characterized in that: Each of the protective parts has multiple through holes at the connection between the middle and the edge, and the multiple through holes are arranged circumferentially around the cavity.
10. An electrical appliance, characterized in that: The power battery of the electrical equipment is equipped with a cover plate assembly as described in any one of claims 1-9.