Battery cover plate isolation assembly and battery
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
Smart Images
Figure CN224554663U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of new energy battery technology, and in particular to a battery cover plate isolation assembly and battery. Background Technology
[0002] With the development of new energy technologies, lithium-ion batteries, as a typical example, are widely used in new energy vehicles due to their excellent energy storage and safety.
[0003] During battery manufacturing, the electrode assembly located inside the battery casing needs to have tabs extended from it. These tabs, of the same polarity, are then welded to terminals on the cover plate to establish electrical connection between the battery and external electrical components. The welding of the tabs to the terminals is one of the key processes in battery production, and its quality directly affects the battery's safety and reliability.
[0004] In an electrode assembly, the separator is a crucial component for isolating the positive and negative electrodes. If there are protrusions or fallen weld slag at the welding points of the tabs and terminals, these could puncture the electrode assembly, posing a significant risk to the safe operation of the separator and electrodes. For example, if the separator is punctured by weld slag, the positive and negative electrodes will be directly connected, creating a short circuit. The high temperatures generated by this short circuit can trigger a chain reaction inside the battery, leading to electrolyte decomposition, electrode material decomposition, and ultimately thermal runaway. Thermal runaway can not only damage the battery but also threaten the safety of the vehicle, personnel, and the surrounding environment. Utility Model Content
[0005] In view of this, the present invention aims to provide a battery cover plate isolation assembly to provide a reliable isolation and protection space for the welding parts of the tabs and terminals inside the battery.
[0006] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A battery cover plate isolation assembly includes a battery cover plate and an insulating component disposed on the battery cover plate. The insulating component includes a main pad attached to the inner side of the battery cover plate and a protective pad that can be fastened to the side of the main pad plate opposite to the battery cover plate, and a heat-fusion structure is provided between the main pad plate and the protective pad plate. The main pad plate has a terminal through hole for a terminal post on the battery cover plate to pass through, and a slag collection groove is provided on the protective pad plate corresponding to the terminal through hole. When the protective pad plate is fastened to the main pad plate, the protective pad plate is fixed to the main pad plate by the heat-fusion structure, and the slag collection groove is located below the part of the terminal post bottom used for welding the electrode tab.
[0007] Furthermore, the protective pad is connected to one end of the main pad along its length via a bendable connector, and as the connector bends, the protective pad is fastened to the main pad.
[0008] Furthermore, in the width direction of the protective pad, both sides of the protective pad are located inside the side edge of the main pad; corresponding to each pole post through hole, two slag receiving grooves are provided at intervals in the width direction of the protective pad.
[0009] Furthermore, in the width direction of the protective pad, the width between the slag receiving groove and the side edge of the protective pad is between 0.5mm and 12mm.
[0010] Furthermore, two pole posts through holes are spaced apart along the length of the main pad body, and an explosion-proof valve clearance groove is provided between the two pole posts through holes; the protective pad body includes a middle connecting section corresponding to the explosion-proof valve clearance groove, and a tab protection section corresponding to the two pole posts through holes respectively, and the slag receiving groove is provided on the tab protection section.
[0011] Furthermore, a set of the hot-melt structure is provided at the position between the middle connecting section and the tab protection section, and at the end position of the protective pad away from the connecting part; the hot-melt structure includes a hot-melt column integrally formed on the main pad and a hot-melt hole correspondingly provided on the protective pad; the hot-melt column is inserted and hot-melted fixed in the hot-melt hole.
[0012] Furthermore, the protective pad body has a boss on the side facing the main pad body, and the hot-melt hole is opened on the boss. As the hot-melt column is hot-melted and fixed to the hot-melt hole, the boss abuts against the main pad body. The hot-melt hole includes a through section and a hot-melt section connected in sequence, and the radial dimension of the hot-melt section is larger than the radial dimension of the through section. The hot-melt column passes through the through section, and the head of the hot-melt column is hot-melted and compacted in the hot-melt section.
[0013] Furthermore, the connecting part includes a connecting platform protruding from the end of the main pad towards the side that engages with the protective pad, and a connecting plate connecting the top of the connecting platform and the protective pad, wherein the connecting plate is provided with a thinning groove extending through the width direction of the main pad.
[0014] Furthermore, the thickness of the plate at the bottom of the thinning groove is 0.15mm-0.4mm, and / or the two side walls of the thinning groove are constructed as slopes, and / or the width of the connecting plate is 0.25-0.5 times the width of the protective pad.
[0015] Compared with the prior art, this utility model has the following advantages: (1) The battery cover plate isolation assembly of this utility model is provided on the inner side of the battery cover plate, and the battery cover plate isolation assembly is configured as two parts: a main pad and a protective pad that can be bent and folded together. When assembling the battery, the main pad can be attached to the inner side of the battery cover plate first, and then the tabs led out from the electrode group can be welded to the corresponding terminals. Then the protective pad is fastened to the main pad. In this way, the main pad can form a reliable insulating isolation between the battery cover plate and the tabs, and the protective pad covers the welding part between the terminals and the tabs, and the electrode group is welded to the bottom of the terminals. The tabs are isolated, ensuring effective isolation and protection between the welding area and the electrode assembly. This prevents welding slag from falling into the electrode assembly or welding protrusions from puncturing it. Furthermore, the main pad and the protective pad are connected by heat fusion, ensuring reliable fastening of the protective pad onto the main pad. The slag-receiving groove on the protective pad creates ample space below the electrode post to accommodate welding protrusions of the tabs and electrode post, while also catching welding slag and other foreign objects to prevent them from entering the electrode assembly. This provides a reliable isolation and protection space for the welding areas of the tabs and electrode post within the battery.
[0016] (2) By setting the connecting part, the insulating parts can be processed into an integral structure, which is convenient for storage and retrieval. When performing the fastening operation of the protective pad on the main pad, the operation can also be conveniently completed by bending the connecting part, so as to achieve accurate fastening and positioning of the protective pad on the main pad.
[0017] (3) By reasonably setting the width of the main pad and the width of the protective pad, and setting the protective pad in the center relative to the main pad, space can be reserved on the side of the protective pad for the bending part of the electrode tab to pass through; two slag collection grooves are set for each electrode post through hole, so there is a slag collection groove under the welding part of the two sets of electrode tabs, which well meets the needs of accommodating the welding parts between each electrode post and electrode tab and receiving welding slag.
[0018] (4) A certain width dimension is reserved between the slag receiving trough and the side edge of the protective pad. When the electrode is inserted between the protective pad and the main pad, the side edge of the protective pad can press the electrode onto the main pad, ensuring sufficient contact area between the protective pad and the electrode, ensuring that the electrode has good fixing and shaping effect, and preventing the electrode from shifting or deforming.
[0019] (5) Two pole hole holes are provided at intervals on the main pad body, which is compatible with the case where the battery cover of most batteries has two poles, positive and negative; then the protective pad body is designed as three parts: the middle connecting section and the tab protection section located on both sides of the middle connecting section. The two tab protection sections can respectively cover and protect the bottom of the two poles. The slag collection groove is set on the tab protection section, which can well realize the accommodation of the bottom of the pole and the welding part of the tab.
[0020] (6) Four sets of connection structures are formed between the main pad and the protective pad, and the four sets of connection structures are paired up, with each set corresponding to a terminal through hole. There is a set of connection structures on both sides of each terminal through hole. The two sets of connection structures in the same group form a channel for the electrode tab to pass through the side of the protective pad into the isolation space. This connection layout not only ensures the reliability of the connection between the protective pad and the main pad, but also forms a good separation and restriction for the electrode tabs passing through the isolation space, which greatly improves the isolation and protection effect of the battery cover plate isolation assembly.
[0021] (7) A boss is provided on the protective pad and a hot melt hole is opened on the boss. When the protective pad is fastened to the main pad and the hot melt column is hot melted and fixed to the hot melt hole, the boss can form a support effect between the main pad and the protective pad, thereby defining an isolation space for the electrode tab to pass through between the main pad and the protective pad, providing good accommodation conditions for the electrode tab to pass through.
[0022] (8) The connection part is designed as a connection platform and a connection plate, and a thinning groove is provided on the connection plate to reduce the difficulty of bending the connection part, so as to successfully complete the fastening operation of the protective pad on the main pad; in addition, the connection platform can also play the role of the above-mentioned boss. The connection platform and the boss can together define the height dimension of the isolation space between the main pad and the protective pad, so as to properly insert the electrode ear.
[0023] (9) By optimizing the design of the depth of the thinning groove, the shape of the side wall, and the width of the connecting plate, the bending of the connecting part can be made easier. This ensures sufficient connection strength and reduces the risk of breakage when the connecting part is bent. Moreover, the bent connecting part will form a smooth and regular shape on the outside of the bent part.
[0024] This utility model also proposes a battery in which the battery cover plate isolation assembly described in this utility model is provided. The battery of this utility model possesses the technical advantages of the aforementioned battery cover plate isolation assembly. Attached Figure Description
[0025] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of this utility model. The illustrative embodiments and descriptions of this utility model are used to explain this utility model. The directional terms such as front / back, up / down, etc., used therein are only used to indicate relative positional relationships and do not constitute an improper limitation of this utility model. In the drawings: Figure 1 This is a schematic diagram of the structure of the insulating component described in an embodiment of the present utility model; Figure 2 for Figure 1 A schematic diagram of the structure on the other side of the insulating component is shown; Figure 3 for Figure 2 A magnified view of part A in the diagram; Figure 4 for Figure 3 A schematic diagram of the cross-sectional structure at the location shown in BB; Figure 5 This is a schematic diagram of the insulating component assembled on the battery cover plate according to an embodiment of the present invention; Figure 6 for Figure 5 The diagram shows the structure of the insulating component and the other side of the battery cover. Figure 7 This utility model embodiment shows a schematic diagram of the battery structure during the welding of the tabs and terminals; Figure 8 for Figure 7 The diagram shows the structure of the other side of the battery. Figure 9 for Figure 7 The diagram shows the structure of the battery after the protective pad is attached to the main pad. Figure 10 for Figure 7 The diagram shown is a structural schematic of the battery after the battery cover, insulating components, and electrode assembly are completed. Figure 11 for Figure 10 A schematic diagram of the cross-sectional structure at the location shown in CC; Figure 12 for Figure 10 A schematic diagram of the cross-sectional structure at the location shown in DD; Figure 13 for Figure 12 A magnified view of the area shown in E.
[0026] Explanation of reference numerals in the attached figures: 1. Battery cover; 10. Terminal post; 11. Insulating sleeve; 12. Explosion-proof valve mounting hole; 2. Electrode group; 20. Electrode tab; 3. Connecting part; 32. Connecting platform; 33. Connecting plate; 34. Thinning groove; 4. Main pad body; 40. Pole post through hole; 41. Protrusion; 42. Hot melt column; 420. Head; 43. Explosion-proof valve clearance groove; 430. Vent hole; 5. Protective pad; 50. Middle connecting section; 500. Through hole; 51. Electrode protection section; 510. Slag receiving groove; 511. Hole; 52. Hot melt hole; 521. Insertion section; 522. Hot melt section; 53. Boss. Detailed Implementation
[0027] To make the technical solution and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0028] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.
[0029] Furthermore, it should be stated in the description of this utility model that if terms indicating orientation or positional relationship, such as "up," "down," "left," "right," "front," "back," "inner," and "outer," appear, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and for clarity and conciseness of expression. They do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed or operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Taking the insulating component described in this utility model as an example, the directional terms such as "up," "down," "left," "right," "front," and "back" used in the embodiments are defined based on the upward direction (also known as the height direction), the left and right direction (also known as the width direction), and the front and back direction (also known as the length direction) of the main pad of the insulating component. Specifically, as shown in the accompanying drawings, the X direction is the front and back direction (length direction) of the main pad, and the Y direction is the left and right direction (width direction) of the main pad.
[0030] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.
[0031] In this utility model, 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 utility model. 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.
[0032] The present invention 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.
[0033] An embodiment of the first aspect of this utility model provides a battery cover isolation assembly for isolation and protection between the battery cover 1 and the electrode group 2; and, the battery cover isolation assembly of this embodiment, with its innovative structural design, can provide a reliable isolation and protection space for the welding parts of the tabs 20 and the posts 10 inside the battery.
[0034] Currently, the plastic insulation components under the battery cover are mostly located between the aluminum plate and the tabs to ensure their insulation performance. However, there is no shaping or fixing structure between the tabs 20 and the electrode assembly 2, resulting in poor consistency of the tabs 20 after bending, posing a safety hazard to the product. In particular, due to the welding of the tabs 20 and the posts 10, the protruding structures or weld slag formed during welding, if they puncture the electrode assembly 2 or fall into the electrode assembly 2, could pose a significant risk to the safe operation of the separator and electrode plates in the electrode assembly 2. If the separator is punctured by weld slag, the positive and negative electrodes will be directly connected, forming a short circuit.
[0035] In view of this, in order to overcome the above-mentioned shortcomings of the prior art, the present invention proposes a novel insulating component, one exemplary structure of which is as follows: Figure 1 , Figure 2 and Figure 3 As shown.
[0036] Overall, the battery cover plate isolation assembly includes a battery cover plate 1 and an insulating component disposed on the battery cover plate 1. The insulating component includes a main pad 4 attached to the inner side of the battery cover plate 1 and a protective pad 5 that can be fastened to the side of the main pad 4 facing away from the battery cover plate 1. A heat-fusion structure is provided between the main pad 4 and the protective pad 5. The main pad 4 has a terminal through-hole 40 for the terminal post 10 on the battery cover plate 1 to pass through. Corresponding to the terminal through-hole 40, a slag collection groove 510 is provided on the protective pad 5. When the protective pad 5 is fastened to the main pad 4, the protective pad 5 is fixed to the main pad 4 by the heat-fusion structure, and the slag collection groove 510 is located below the part of the terminal post 10 used for welding the tab 20.
[0037] It should be noted that, based on the above overall design concept, the technical solution of this utility model can adopt a variety of different specific implementation structures, forms, or configuration sequences. For example, the main pad 4 and the protective pad 5 can be integrally injection molded using materials with insulating properties such as rubber and plastic; the connecting part 3 can be made easy to bend by thinning, opening holes, and other methods. The specific arrangement sequence and assembly method of the insulating parts on the battery cover 1 and the fastening and fixing of the protective pad 5 on the main pad 4 can also be flexibly adjusted. For parts required for the overall implementation but not covered in the above overall setup, reasonable and flexible designs can be made by referring to mature design methods in the field and the actual situation during implementation, which will not be elaborated here. The specific implementation schemes described below in this embodiment are only one of the more preferred solutions among the many solutions that can be formed by the various combinations and variations described above. In actual implementation, those skilled in the art can make flexible adjustments and improvements based on the actual situation. Obviously, the many solutions that can be formed by the various combinations and variations described above, as well as the specific implementation schemes of this embodiment, are all within the protection scope of this utility model.
[0038] Of course, the main pad 4 and the protective pad 5 described above can be of a separate structure; however, preferably, in this embodiment, such as Figures 1 to 3 As shown, in some preferred exemplary embodiments, the protective pad 5 is connected to one end of the main pad 4 along its length via a bendable connecting portion 3. As the connecting portion 3 bends, the protective pad 5 is fastened to the main pad 4. By providing the connecting portion 3, the insulating component can be processed into a single structure, facilitating storage and retrieval. Furthermore, the operation of fastening the protective pad 5 to the main pad 4 can be conveniently completed by bending the connecting portion 3, achieving accurate fastening and positioning of the protective pad 5 on the main pad 4.
[0039] Regarding the specific configuration of the connecting part 3, there are naturally many different structural options available; for example, an elongated hole arranged along the width direction of the main pad 4 can be made on the connecting part 3. This way, when the connecting part 3 is bent, the position of the elongated hole can be easily bent, allowing the protective pad 5 to be smoothly fastened onto the main pad 4. However, in this embodiment, as... Figure 3 and Figure 4As shown, the connecting part 3 includes a connecting platform 32 protruding from the end of the main pad 4 toward the side that engages with the protective pad 5, and a connecting plate 33 connecting the top of the connecting platform 32 and the protective pad 5; the connecting plate 33 is provided with a thinning groove 34 that extends through the width of the main pad 4. The thinning groove 34 can be provided on only one side of the connecting plate 33, or it can be provided on both sides of the connecting plate 33, with the two thinning grooves 34 facing back to back and their bottoms facing each other. The position where the bottom of the thinning groove 34 is located is the thinnest position on the connecting plate 33, and the bending part of the connecting part 3 will naturally appear at this position.
[0040] Based on the above configuration, in the width direction of the main pad 4, the width dimension W3 of the connecting plate 33 can be set to 0.25-0.5 times the width dimension W2 of the protective pad 5. Designing the connecting plate 33 as a sheet and setting its width dimension W3 to 0.25-0.5 times the width dimension W2 makes the connecting plate 33 easier to bend, thereby improving the convenience and yield of the protective component assembly. Furthermore, designing the connecting part 3 as two parts—a connecting platform 32 and a connecting plate 33—and providing a thinning groove 34 on the connecting plate 33, can reduce the difficulty of bending the connecting part 3, thus smoothly completing the fastening operation of the protective pad 5 on the main pad 4. Moreover, the connecting platform 32, together with the aforementioned boss 53, can define the height dimension H of the isolation space between the main pad 4 and the protective pad 5, thereby effectively accommodating the inserted tab 20.
[0041] Continue as Figure 4 As shown, in this embodiment, in some preferred exemplary embodiments, the depth of the thinning groove 34 is approximately one-third of the thickness T2 of the connecting plate 33, and the bent portion of the connecting part 3 is formed at the bottom of the thinning groove 34. By setting the depth of the thinning groove 34 to approximately one-third of the thickness T2 of the connecting plate 33, since there is a thinning groove 34 on each side of the connecting plate 33, the thickness of the plate at the bottom of the thinning groove 34 is one-third of the thickness T2 of the connecting plate 33. After this portion is significantly thinned, it is easier to bend the connecting part 3 at this location, thus forming the bent portion of the connecting part 3 at a predetermined position at the bottom of the thinning groove 34. Preferably, the thickness T2 of the connecting plate 33 can be set to 0.45mm-1.2mm, then the thickness of the plate at the bottom of the thinning groove 34 is limited to the range of 0.15mm-0.4mm. This makes it easier to fold the connecting part 3 from this position. After folding, the connecting plates 33 on both sides of the folded part of the connecting part 3 can fit together well. With the help of the connecting platform 32, it is easier and more accurate to define the height dimension H of the isolation space between the protective pad 5 and the main pad 4 after fastening.
[0042] For other specific dimensions of the connecting plate 33 and its surrounding structure, the following settings can be adopted. (Still as...) Figure 4 As shown, to facilitate the processing and forming of the thinning groove 34, its cross-section can be designed as a triangle, and the side walls on both sides of the thinning groove 34 are constructed as slopes. The width D1 of the first transition area with slopes on both sides of the bending part can be set to 0.3mm-4.5mm, and the width D2 of the second transition area can be set to 0.35mm-4.8mm. This ensures a smooth overall transition after the connecting plate 33 is bent, ensuring the stability of the product and preventing defects such as shrinkage that could reduce the reliability of the product. By designing the thinning groove 34 as a groove with a triangular cross-section, a slope-shaped transition will be formed on both sides of the bending part at the bottom of the thinning groove 34 by the side walls of the thinning groove 34. This not only reduces the risk of breakage when the connecting part 3 is bent, but also results in a smoother and more regular shape on the outer side of the bending part of the connecting part 3 after bending.
[0043] In addition, the thickness T1 of the aforementioned connecting platform 32 can be set to 0.6mm-2.8mm to ensure the connection strength of the product and prevent the electrode tab 20 from collapsing due to deformation of the protective component during bending and after bending. The thickness T2 of the connecting plate 33 located between the thinning groove 34 and the protective pad 5 can be set to 0.4mm-1.2mm, or it can be the same thickness as the protective pad 5, to ensure sufficient connection strength between the main pad 4 and the protective pad 5, so that the electrode tab 20 can be firmly fixed in the welding design position located between the main pad 4 and the protective pad 5.
[0044] As mentioned above, a slag-receiving groove 510 is formed on the protective pad 5 corresponding to the through hole 40 of the pole post. The slag-receiving groove 510 is positioned directly opposite the welding area of the pole post 10 and the tab 20. The slag-receiving groove 510 on the protective pad 5 creates a relatively spacious area below the pole post 10 to accommodate the welding protrusions of the tab 20 and the pole post 10. It also catches welding slag and other foreign matter formed during welding, preventing foreign matter from entering the electrode assembly 2.
[0045] Furthermore, holes 511 can be made in the side wall of the slag receiving tank 510, with a gap between the holes 511 and the bottom of the slag receiving tank 510. Making holes 511 in the side wall of the slag receiving tank 510 not only helps reduce the weight of the insulating components, but also allows the electrolyte to enter the electrode assembly 2 of the battery through the holes 511 in the slag receiving tank 510 and its side wall when electrolyte is injected into the electrode assembly 2 through the electrode post through-hole 40. Moreover, the gap between the holes 511 and the bottom of the slag receiving tank 510 reduces the risk of welding slag, foreign objects, etc., in the slag receiving tank 510 falling into the electrode assembly 2 through the holes 511. In practical implementation, multiple holes 511 can be evenly distributed along the edge of the slag receiving groove 510. A connecting rib will be formed between two adjacent holes 511. With the help of the elastic deformation performance of the connecting rib, when the bottom of the slag receiving groove 510 abuts against the electrode group 2, the slag receiving groove 510 forms a good elastic support between the battery cover plate 1 and the protective pad 5.
[0046] Continue as Figure 5 and Figure 6 As shown, in this embodiment, in the width direction of the protective pad 5, both sides of the protective pad 5 are located inside the side edge of the main pad 4; at the same time, corresponding to each electrode through hole 40, two slag receiving grooves 510 are provided at intervals in the width direction of the protective pad 5. By reasonably setting the width dimension W1 of the main pad 4 and the width dimension W2 of the protective pad 5, and centering the protective pad 5 relative to the main pad 4, space can be reserved on the side of the protective pad 5 for the bending part of the electrode tab 20 to pass through; in specific settings, the width dimension W2 can be 1.0mm-6.0mm smaller than the width dimension W1, so that the spacing space on the side of the protective pad 5 is maintained between 0.5mm-3.0mm, forming a suitable space to avoid the bending part of the electrode tab 20 from passing through, preventing the electrode tab 20 from contacting the battery casing or battery cover 1 and causing a short circuit. Space is reserved on both sides of the protective pad 5 for the tabs 20 to pass through. The electrode group 2 inside the battery casing can lead out two sets of tabs 20 from both sides of the protective pad 5 and pass into the isolation space between the protective pad 5 and the main pad 4, and weld them to the same pole post 10. Since two slag receiving grooves 510 are provided for each pole post through hole 40 (i.e. each pole post 10), there is a slag receiving groove 510 under the welding part of each set of tabs 20, which well meets the needs of accommodating the welding part between each pole post 10 and tab 20 and receiving welding slag.
[0047] Based on the above configuration, preferably, in the width direction of the protective pad 5, a plate of a certain width is left between the slag receiving groove 510 and the side edge of the protective pad 5. Preferably, as shown in the example... Figure 3As shown, the width W of the plate body on the side edge of the remaining protective pad 5 can be set between 0.5mm and 12mm. A certain width dimension is maintained between the slag receiving groove 510 and the side edge of the protective pad 5. When the electrode tab 20 is inserted between the protective pad 5 and the main pad 4, the side edge of the protective pad 5 can press the passing electrode tab 20 tightly onto the main pad 4, ensuring sufficient contact area between the protective pad 5 and the electrode tab 20, ensuring that the electrode tab 20 has a good fixing and shaping effect, and preventing the electrode tab 20 from shifting or deforming.
[0048] Regarding the specific placement and quantity of the aforementioned hot-melt structures, there are naturally many different structural options to choose from. In this embodiment, such as... Figure 6 and combined Figure 7 , Figure 8 , Figure 9 As shown, in some preferred exemplary embodiments, two pole through holes 40 are provided at intervals along the length of the main pad body 4, and an explosion-proof valve clearance groove 43 is provided between the two pole through holes 40; the protective pad body 5 includes a middle connecting section 50 corresponding to the explosion-proof valve clearance groove 43, and a tab protection section 51 corresponding to the two pole through holes 40 respectively, and the aforementioned slag receiving groove 510 is provided on the tab protection section 51.
[0049] Two electrode through holes 40 are provided at intervals on the main pad body 4, which is compatible with the case where the battery cover plate 1 of most batteries has two positive and negative electrodes 10. Furthermore, the protective pad body 5 is designed as three parts: a central connecting section 50 and electrode tab protection sections 51 located on both sides of the central connecting section 50. The two electrode tab protection sections 51 can respectively cover and protect the bottom of the two electrodes 10. The slag receiving groove 510 is set on the electrode tab protection section 51, which effectively accommodates the welding part between the bottom of the electrode 10 and the electrode tab 20. Of course, in order to meet the installation and use requirements of the explosion-proof valve, an explosion-proof valve mounting hole 12 should be provided in the middle of the battery cover plate 1 for the installation of the explosion-proof valve, and an explosion-proof valve clearance groove 43 should be provided on the main pad body 4 accordingly. A vent hole 430 should be provided at the bottom of the explosion-proof valve clearance groove 43, and a through hole 500 should be provided on the middle connecting section 50. In this way, when the electrode group 2 inside the battery has a short circuit or other abnormality, causing a surge in the gas pressure inside the battery, the gas can be discharged to the outside through the through hole 500, the vent hole 430 and the explosion-proof valve in sequence, reducing the risk of battery explosion.
[0050] Based on the above configuration, the arrangement of the heat-fusion structure in this embodiment is preferably as follows: A set of heat-fusion structures is provided at the position between the corresponding middle connecting section 50 and the tab protection section 51, and at the end position of the protective pad 5 away from the connecting part 3. Each set of heat-fusion structures may include one or more heat-fusion structures.
[0051] Based on the layout of the protective pad 5 and the main pad 4, three sets of heat-fused structures are provided at the end furthest from the connecting part 3 and between the middle connecting section 50 and the tab protection section 51. Together with the connection of the connecting part 3, four sets of connection structures are formed between the main pad 4 and the protective pad 5. Moreover, these four sets of connection structures are arranged in pairs, with each set corresponding to a pole through hole 40. There is a set of connection structures on each side of each pole through hole 40. The two sets of connection structures in the same group form a channel for the tab 20 to pass through the side of the protective pad 5 into the isolation space. This connection layout not only ensures the reliability of the connection between the protective pad 5 and the main pad 4, but also provides good separation and restriction for the tab 20 passing through the isolation space, greatly improving the isolation and protection effect of the insulating component.
[0052] For the specific structure of the heat-fusion structure, there are naturally many different structural solutions to choose from; for example, a mating structure of insert plate and slot can be used, where heating and heat fusion occur simultaneously with insertion. In this embodiment, such as... Figure 8 and combined Figures 10 to 13 As shown, in some preferred exemplary embodiments, the hot-melt structure includes a hot-melt column 42 integrally formed on the main pad 4 and a hot-melt hole 52 correspondingly disposed on the protective pad 5; the hot-melt column 42 is inserted and hot-melted fixedly connected to the hot-melt hole 52. By configuring the hot-melt structure as an inserted hot-melt form of the hot-melt column 42 and the hot-melt hole 52, after the hot-melt column 42 on the main pad 4 is inserted into the hot-melt hole 52 on the protective pad 5, the hot-melt column 42 can be heated and hot-melted to be fixedly connected to the hot-melt hole 52, providing good positioning and strong connection performance.
[0053] Based on the above configuration of the hot-melt structure, such as Figure 2 or Figure 6 As shown, each set of hot melt structures may include three hot melt pillars 42 evenly distributed along the width direction of the protective pad 5, and three hot melt holes 52 correspondingly provided on the protective pad 5.
[0054] Furthermore, in some preferred exemplary embodiments, the protective pad 5 has a boss 53 on the side facing the main pad 4, and a hot-melt hole 52 is formed on the boss 53. As the hot-melt column 42 is hot-melted and fixed to the hot-melt hole 52, the boss 53 abuts against the main pad 4 to define the height dimension H of the isolation space. By providing the boss 53 on the protective pad 5 and forming the hot-melt hole 52 on the boss 53, when the protective pad 5 is fastened to the main pad 4 and the hot-melt column 42 is hot-melted and fixed to the hot-melt hole 52, the boss 53 can form a supporting effect between the main pad 4 and the protective pad 5, thereby defining an isolation space for the tab 20 to pass through between the main pad 4 and the protective pad 5, providing good accommodation conditions for the insertion of the tab 20. The height of the boss 53 itself can define the height dimension H of the isolation space. By reasonably setting the height dimension of the boss 53, the required height dimension H of the isolation space can be obtained. Preferably, the height dimension H (i.e. the height dimension of the boss 53) can be set between 1mm and 5mm. At the same time, the height of the connecting platform 32 at the connecting part 3 should be consistent with the height of the boss 53, so that the isolation space formed between the protective pad 5 and the main pad 4 is more regular.
[0055] like Figure 13 In some preferred exemplary embodiments, the heat-fusion hole 52 includes a through section 521 and a heat-fusion section 522 connected in sequence, and the radial dimension D of the heat-fusion section 522 is larger than the radial dimension d of the through section 521. When the protective pad 5 is fastened to the main pad 4, the heat-fusion column 42 passes through the through section 521, and the head 420 of the heat-fusion column 42 is heat-fused and compacted in the heat-fusion section 522. The hot melt hole 52 is designed with two sections: an insertion section 521 and a hot melt section 522. The radial dimension D of the hot melt section 522 is larger. After the hot melt column 42 is inserted into the hot melt hole 52, the head 420 of the hot melt column 42 can protrude outside the hot melt section 522. Then, the head 420 of the hot melt column 42 is hot melted and pressed into the hot melt section 522. The head 420, which is deformed by hot pressing, will fill the entire hot melt section 522. After the head 420 solidifies, the hot melt column 42 is securely fixed in the hot melt hole 52, which can avoid the risk of the hot melt column 42 coming out of the hot melt hole 52.
[0056] In practical applications, the battery cover 1 typically has two terminals 10 spaced apart. An insulating sleeve 11 is fitted over each terminal 10, creating an insulating barrier between the terminal 10 and the battery cover 1. An explosion-proof valve is installed between the two terminals 10. Therefore, in this embodiment, an explosion-proof valve mounting hole 12 is provided in the middle of the battery cover 1. Corresponding to the explosion-proof valve mounting hole 12, the main pad 4 in this embodiment has an explosion-proof valve clearance groove 43, and a vent hole 430 is provided at the bottom of the explosion-proof valve clearance groove 43. A corresponding through hole 500 is provided on the protective pad 5. When a short circuit or other abnormality occurs in the electrode group 2 inside the battery, the exhaust channels formed by the aforementioned holes can release the high-pressure gas inside the battery casing. Simultaneously, protrusions 41 can be provided around the perimeter of the terminal through hole 40. These protrusions 41 can have slots or other structures, and corresponding locking protrusions are provided on the battery cover 1 to facilitate better positioning and installation of the main pad 4 when it is attached to the battery cover 1.
[0057] In summary, the battery cover plate isolation assembly of this embodiment, by setting the battery cover plate isolation assembly on the inner side of the battery cover plate 1, and setting the battery cover plate isolation assembly into two parts, a main pad 4 and a protective pad 5, which can be bent and folded together, allows the main pad 4 to be first attached to the inner side of the battery cover plate 1 during battery assembly. Then, the tabs 20 led out from the electrode group 2 are welded to the corresponding terminals 10, and the protective pad 5 is then fastened to the main pad 4. In this way, the main pad 4 can form a reliable insulating isolation between the battery cover plate 1 and the tabs 20, while the protective pad 5 covers the welding area between the terminals 10 and the tabs 20, and keeps the electrode group 2 and the bottom of the terminals 10 from being welded together. The tabs 20 are isolated, ensuring the isolation and protection between the welding parts and the electrode group 2, preventing welding slag from falling into the electrode group 2 or the welding protrusions from piercing the electrode group 2; in addition, the main pad 4 and the protective pad 5 are connected by heat fusion, ensuring the reliability of the fastening connection of the protective pad 5 on the main pad 4. The slag receiving groove 510 provided on the protective pad 5 can form a relatively spacious space under the electrode post 10 to accommodate the welding protrusions of the tabs 20 and the electrode post 10, and can also receive foreign objects such as welding slag formed by welding, preventing foreign objects from entering the electrode group 2, thereby providing a reliable isolation and protection space for the welding parts of the tabs 20 and the electrode post 10 inside the battery.
[0058] A second aspect of this utility model provides a battery, which includes the insulating element provided in the first aspect; an exemplary structure of the battery is as follows: Figure 10 , Figure 11 , Figure 12 and Figure 13 Show.
[0059] When using the insulating component of Embodiment 1, after the welding of the tab 20 and the fastening and fixing of the protective pad 5 to the main pad 4 are completed, the overall cross-sectional structure of the battery is as follows: Figure 11 and Figure 12 As shown, due to the thinning groove 34, the connecting part 3 is folded at the bending part at the bottom of the thinning groove 34. After folding, the connecting plates 33 on both sides of the bending part are attached together. Due to the presence of the connecting platform 32 and the boss 53 at the hot-melt structure, the isolation space for accommodating the electrode tab 20 between the main pad 4 and the protective pad 5 is well defined, and the height H of the isolation space is consistent with the height of the connecting platform 32 and the boss 53. In the specific dimensional settings of the hot-melt structure in this embodiment, the net height of the boss 53 is 0.8mm-3.2mm, and the height of the connecting platform 32 at the connecting part 3 is also set to 0.8mm-3.2mm. After the protective pad 5 is fastened to the main pad 4, it can be ensured that the protective pad 5 presses the electrode tab 20 tightly. The height H of the isolation space between the protective pad 5 and the main pad 4 is also 0.8mm-3.2mm.
[0060] like Figure 11 As shown, the protective pad 5 is provided with a slag-receiving groove 510, which is located directly below the electrode tab 20. Multiple holes 511 are spaced apart at the top of the sidewall of the slag-receiving groove 510. The spacing between the holes 511 and the bottom of the slag-receiving groove 510, i.e., the net depth t of the slag-receiving groove 510, can be flexibly set within a reasonable range. Preferably, the total depth T of the slag-receiving groove 510 can be set between 1.5mm and 5.5mm, such as 1.5mm, 4mm, or 5mm. A reasonable depth of the slag-receiving groove 510 can better accommodate protrusions or weld slag at the welding points of the electrode tab 20 and the electrode post 10, thereby reducing the risk of weld slag piercing the diaphragm of the electrode assembly 2. In a further preferred embodiment, the net depth t of the slag receiving tank 510 can be set between 0.3mm and 5mm, such as 0.3mm, 4mm, 5mm, etc., where T>t, ensuring sufficient wetting effect of the electrolyte and the slag receiving tank 510's capacity to accommodate welding slag.
[0061] like Figure 13 As shown, after the protective pad 5 is fastened, the hot-melt column 42 is inserted into the hot-melt hole 52. The hot-melt hole 52 includes a through section 521 and a hot-melt section 522 connected in sequence. The radial dimension D of the hot-melt section 522 is larger than the radial dimension d of the through section 521. The diameter of the hot-melt column 42 can also be set to the radial dimension d. After the hot-melt column 42 is inserted into place, the head 420 of the hot-melt column 42 will protrude outside the hot-melt hole 52. The head 420 is melted by heating, and then the melted head 420 is pressed into the hot-melt section 522. Due to the deformation caused by heat and pressure, the radial dimension of the head 420 increases, completely filling the entire hot-melt section 52, thereby effectively preventing the hot-melt column 42 from coming out of the hot-melt hole 52, making the hot-melt connection firm and reliable.
[0062] In terms of specific dimensions, preferably, the total depth of the hot-melt hole 52 is 1.8mm-5.0mm, which can be reasonably adjusted according to the thickness of the tab 20 to ensure that the insulation features after bending are completely compacted onto the tab 20, so that the tab 20 is in a fixed state; the depth h of the hot-melt section 522 can be set to 0.4mm-1.5mm, and the radial dimension D of the hot-melt section 522 is set to 2.05mm-6.5mm; the radial dimension d of the insertion section 521 and the diameter of the hot-melt column 42 are both set to 1.5mm-6mm, and the difference between D and d is ensured to be between 0.5mm-3mm to ensure the strength of the hot-melt connection, ensure the structural reliability of the protective pad 5 fastened to the main pad 4, and ensure the safety of the product.
[0063] This solution incorporates a novel tab protection structure, adding a protective pad 5. The protective pad 5 is securely fastened to the main pad 4, serving to fix and shape the tab 20. The rational design of the connecting part 3 ensures its bending effect. In this way, the bent tab 20 can be well confined between the protective pad 5 and the main pad 4, ensuring the consistency of the tab 20 after bending and preventing the risk of the tab 20 and the electrode post 10 being inserted backwards into the electrode group 2 at the welding point, thus improving the safety of the product.
[0064] The above description is merely a preferred embodiment of this utility model. Detailed explanations of configurations, examples of specific structural arrangements, and descriptions of assembly and connection methods are provided to ensure sufficient disclosure so that those skilled in the art can better implement this utility model, and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.
Claims
1. A battery cover plate isolation assembly, characterized in that: Includes a battery cover and an insulating component disposed on the battery cover; The insulating component includes a main pad attached to the inner side of the battery cover and a protective pad that can be fastened to the side of the main pad facing away from the battery cover, and a heat-fused structure is provided between the main pad and the protective pad. The main pad is provided with a terminal through hole for the terminal on the battery cover to pass through. Corresponding to the terminal through hole, a slag receiving groove is provided on the protective pad. When the protective pad is fastened to the main pad, the protective pad is fixed to the main pad through the hot melt structure. The slag receiving groove is located below the part of the terminal at the bottom for welding the electrode tab.
2. The battery cover plate isolation assembly according to claim 1, characterized in that: The protective pad is connected to one end of the main pad along its length via a bendable connector. As the connector bends, the protective pad is fastened to the main pad.
3. The battery cover plate isolation assembly according to claim 2, characterized in that: In the width direction of the protective pad, both sides of the protective pad are located inside the side edge of the main pad; corresponding to each pole post through hole, two slag receiving grooves are provided at intervals in the width direction of the protective pad.
4. The battery cover plate isolation assembly according to claim 3, characterized in that: In the width direction of the protective pad, the width W between the slag receiving groove and the side edge of the protective pad is between 0.5mm and 12mm.
5. The battery cover plate isolation assembly according to claim 2, characterized in that: Two pole post through holes are provided at intervals along the length of the main pad body, and an explosion-proof valve clearance groove is provided between the two pole post through holes; The protective pad includes a central connecting section corresponding to the explosion-proof valve clearance groove, and electrode tab protective sections corresponding to the two electrode through holes respectively, with the slag receiving groove provided on the electrode tab protective sections.
6. The battery cover plate isolation assembly according to claim 5, characterized in that: A set of the hot-melt structure is provided at the position between the middle connecting section and the tab protection section, and at the end of the protective pad away from the connecting part. The hot-melt structure includes a hot-melt column integrally formed on the main pad body, and a hot-melt hole correspondingly disposed on the protective pad body; the hot-melt column is inserted into and hot-melted fixed in the hot-melt hole.
7. The battery cover plate isolation assembly according to claim 6, characterized in that: The protective pad body has a protrusion on the side facing the main pad body, and the hot melt hole is opened on the protrusion. As the hot melt column is hot melted and fixed to the hot melt hole, the protrusion abuts against the main pad body. The hot-melt hole includes a through section and a hot-melt section connected in sequence, and the radial dimension D of the hot-melt section is greater than the radial dimension d of the through section; the hot-melt column passes through the through section, and the head of the hot-melt column is hot-melted and compacted in the hot-melt section.
8. The battery cover isolation assembly according to any one of claims 2 to 7, characterized in that: The connecting part includes a connecting platform that protrudes from the end of the main pad towards the side that engages with the protective pad, and a connecting plate connecting the top of the connecting platform and the protective pad, wherein the connecting plate is provided with a thinning groove that extends through the width direction of the main pad.
9. The battery cover plate isolation assembly according to claim 8, characterized in that: The thickness of the plate at the bottom of the thinning groove is 0.15mm-0.4mm, and / or the two side walls of the thinning groove are constructed as slopes, and / or the width dimension W3 of the connecting plate is 0.25-0.5 times the width dimension W2 of the protective pad.
10. A battery, characterized in that: The battery includes a battery cover isolation assembly as described in any one of claims 1 to 9.