Battery and plastic cover plate thereof

Abstract

The utility model relates to new energy battery technical field and provide a kind of battery and its cover plate plastic part.The utility model discloses battery cover plate plastic part is structured as sheet shape, including the main piece body that can be attached to the inside of battery cover plate, and the protective piece body being separately arranged in the length direction of main piece body two ends, and main piece body is equipped with the pole post via hole for the pole post on battery cover plate passing.Wherein, main piece body and protective piece body are connected by the bending part of bendable, with the bending of bending part, protective piece body can be buckled on main piece body, to separate the pole group from the pole lug welded on the bottom of pole post.The utility model discloses battery cover plate plastic part, main piece body can form reliable insulation isolation between battery cover plate and pole lug, protective piece body forms cover to the welding position between pole post and pole lug, and separates the pole group from the pole lug welded on the bottom of pole post, to form good isolation protection between the pole group of battery and pole post.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery technology, and in particular to a battery and its cover plastic part. 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 plastic cover for a battery so as to form a good isolation and protection between the battery's electrode assembly and terminals.

[0006] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A battery cover plastic component is provided for isolation and protection between a battery cover and an electrode assembly. The battery cover plastic component is constructed as a sheet, including a main sheet body that can be attached to the inner side of the battery cover, and protective sheets disposed at both ends of the main sheet body along its length. The main sheet body has electrode post through holes for the electrode posts on the battery cover to pass through. The main sheet body and the protective sheets are connected by a bendable bending portion. As the bending portion bends, the protective sheets can be fastened to the main sheet body to isolate the electrode assembly from the electrode tabs welded to the bottom of the electrode posts.

[0007] Furthermore, a connecting portion is provided on the side of the electrode through hole near the middle of the main body, and a connecting mating portion is provided on the protective sheet corresponding to the connecting portion; the connecting mating portion is connected to the connecting portion to keep the protective sheet in a state of being engaged with the main body; the electrode tab is inserted from one side of the protective sheet in the width direction between the protective sheet and the main body to be welded to the electrode.

[0008] Furthermore, the protective sheet is provided with a boss. As the connecting mating part is fixed to the connecting part, the boss abuts against the main sheet and defines a gap space between the main sheet and the protective sheet for accommodating the inserted tab.

[0009] Furthermore, the connecting portion includes a hot-melt post integrally formed on the main sheet body, and the connecting mating portion includes a hot-melt hole provided on the protective sheet body, wherein the hot-melt post is inserted into and hot-melted fixed in the hot-melt hole; and / or, the connecting portion includes a snap-fit ​​post integrally formed on the main sheet body, and the connecting mating portion includes a snap-fit ​​hole provided on the protective sheet body, wherein the snap-fit ​​post is inserted into and snapped into the snap-fit ​​hole.

[0010] Furthermore, in the width direction of the main sheet, the side edge of the protective sheet is located inside the side edge of the main sheet, and the distance between the side edge of the protective sheet and the side edge of the main sheet is between 0.5mm and 3.0mm.

[0011] Furthermore, the bending portion is configured as a sheet, and in the width direction of the main sheet, the width of the bending portion is 0.25-0.5 times the width of the protective sheet.

[0012] Furthermore, the middle part of the bent portion is provided with an elongated hole arranged along the width direction of the main body.

[0013] Furthermore, the bending portion includes a connecting platform protruding from the end of the main sheet towards the side away from the battery cover, and a connecting plate connecting the top of the connecting platform and the protective sheet, wherein the connecting plate is provided with a thinning groove extending through the width direction of the main sheet.

[0014] Furthermore, the bent portion of the bending part is located at the bottom of the thinning groove, and the thickness of the bottom of the thinning groove is between 0.15mm and 0.4mm.

[0015] Compared with the prior art, this utility model has the following advantages: (1) The battery cover plastic part of this utility model is mainly composed of a main body and a protective sheet that can be bent and folded together. When using the battery cover plastic part, the main body can be attached to the inner side of the battery cover first, and then the tabs led out from the electrode group can be welded to the corresponding poles. Then the gap space is bent to fasten the protective sheet to the main body. In this way, the main body can form a reliable insulation between the battery cover and the tabs, and the protective sheet covers the welding part between the poles and the tabs, and isolates the electrode group from the tabs welded to the bottom of the poles, ensuring the isolation and protection effect between the welding part and the electrode group, preventing welding slag from falling into the electrode group or the welding protrusion from piercing the electrode group, thereby forming a good isolation and protection between the battery electrode group and the poles.

[0016] (2) If the connecting part is set on the side of the pole through hole near the middle of the main body, the connecting part and the space between each protective plate will be located on both sides of the pole through hole, thus reserving a channel for the working electrode ear to pass through on one side of the width direction of the protective plate. The electrode ear can be inserted between the protective plate and the main body through this channel to achieve welding with the pole. The connection between the connecting part and the connecting mating part can make the protective plate securely fastened to the main body, ensuring the reliability of the fastening connection of the protective plate on the main body.

[0017] (3) A protrusion is provided on the protective sheet. When the protective sheet is fastened to the main sheet, the protrusion forms a support effect between the main sheet and the protective sheet, thereby defining a gap space between the main sheet and the protective sheet, providing good accommodation conditions for the insertion of the tab.

[0018] (4) The main body and the protective body are connected by heat fusion, which can effectively improve the reliability of the fastening connection of the protective body on the main body; the snap-fit ​​method has the technical advantage of convenient assembly operation.

[0019] (5) By reasonably setting the width of the main plate and the width of the protective plate, and setting the protective plate in the center relative to the main plate, space can be reserved on the side of the protective plate for the bending part of the tab to pass through, so as to prevent the tab from contacting the battery casing or battery cover and causing a short circuit.

[0020] (6) The bending part is designed as a thin sheet and its width is set to 0.25-0.5. The bending part is easier to bend, thereby improving the convenience and yield of the assembly of the plastic parts of the battery cover.

[0021] (7) If an elongated hole is provided on the bending part, the bending part can occur at the location of the elongated hole, which can further reduce the difficulty of bending the bending part and facilitate the fastening operation of the protective sheet on the main sheet.

[0022] (8) The bending part is designed as a connecting platform and a connecting plate, and a thinning groove is set on the connecting plate. This can also reduce the difficulty of bending the bending part, so as to successfully complete the fastening operation of the protective plate on the main plate. In addition, the setting of the connecting platform plays the role of the above-mentioned boss, which can limit the gap space between the main plate and the protective plate, so as to accommodate the inserted tabs well.

[0023] (9) Limiting the thickness of the plate at the bottom of the thinning groove to between 0.15mm and 0.4mm makes it easier to fold the bending part from this position. After folding, the connecting plates on both sides of the folded part can fit together well. With the help of the above-mentioned connecting platform, it is easier and more accurate to limit the height of the gap between the snap-fit ​​protective plate and the main plate.

[0024] This utility model also proposes a battery in which the battery cover plastic component described in this utility model is provided. The battery of this utility model possesses the technical advantages of the aforementioned battery cover plastic component. 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 plastic part of the battery cover facing the battery cover side according to an embodiment of the present utility model; Figure 2 for Figure 1 The diagram shows the structure of the plastic battery cover part facing away from the battery cover. Figure 3 for Figure 2 A magnified view of part A in the diagram; Figure 4 for Figure 2 The diagram shows the structure of the battery cover plastic part after the protective sheet is fastened to the main sheet. Figure 5 This is a schematic diagram of the structure of a battery cover plastic part with a different bent portion configuration as described in an embodiment of the present utility model, facing the side of the battery cover. Figure 6 for Figure 5 The diagram shows the structure of the plastic battery cover part facing away from the battery cover. Figure 7 for Figure 6 A magnified view of the part shown in B; Figure 8 for Figure 7 A schematic diagram of the cross-sectional structure at the location shown in CC; Figure 9 for Figure 6 The diagram shows the structure of the battery cover plastic component after the protective sheet is fastened to the main sheet. Figure 10 This is a schematic diagram of the battery structure during the welding of the tabs and terminals according to an embodiment of the present invention; Figure 11 for Figure 10 The diagram shows the structure of the other side of the battery. Figure 12 This is a schematic diagram of the battery structure after the welding of the tabs and terminals is completed, according to an embodiment of the present invention. Figure 13 for Figure 12 A schematic diagram of the cross-sectional structure at the location shown in DD; Figure 14 for Figure 12 A schematic diagram of the cross-sectional structure at the location shown in EE; Figure 15 for Figure 14 A magnified view of the part shown in F; Figure 16 A battery configured for another type of bend in Figure 12 A schematic diagram of a partial cross-sectional structure at the location shown in EE.

[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. Bending section; 30. Elongated hole; 31. Deformation notch; 32. Connecting platform; 33. Connecting plate; 34. Thinning groove; 4. Main body; 40. Through hole for pole post; 41. Protrusion; 420. Hot melt post; 421. Head; 422. Snap-fit ​​post; 423. Clip head; 43. Explosion-proof valve clearance groove; 430. Through hole; 5. Protective plate body; 51. Hot melt hole; 510. First boss; 511. Insertion section; 512. Hot melt section; 52. Snap-fit ​​hole; 520. Second boss; 521. Insertion section; 522. Snap-fit ​​section. 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 of the present invention can be combined with each other.

[0029] Furthermore, it should be stated in the description of this utility model that if terms such as "upper," "lower," "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, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed or operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[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. The limiting terms such as "first," "second," "A," "B," "C," and "D" appearing in the description of this utility model are merely for distinguishing similar features in different locations, attributions, or uses, in order to avoid ambiguity and confusion, and should not be construed as indicating or implying relative importance.

[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 plastic component for isolation and protection between the battery cover 1 and the electrode assembly 2; furthermore, the battery cover plastic component of this embodiment, through its innovative structural design, can form good isolation and protection between the battery electrode assembly 2 and the terminal post 10.

[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 group 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 &20 and &10, the protruding structures or weld slag formed by welding, if they puncture the electrode group 2 or fall into the electrode group 2, could pose a significant risk to the safe operation of the separator and electrode sheets in the electrode group 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 plastic battery cover, one exemplary structure of which is as follows: Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown.

[0036] Overall, the battery cover plastic component is constructed as a sheet, including a main sheet 4 that can be attached to the inside of the battery cover 1, and protective sheets 5 disposed at both ends of the main sheet 4 along its length. The main sheet 4 has electrode through holes 40 for the electrode posts 10 on the battery cover 1 to pass through. The main sheet 4 and the protective sheets 5 are connected by a bendable bending portion 3. As the bending portion 3 bends, the protective sheets 5 can be fastened to the main sheet 4 to isolate the electrode assembly 2 from the electrode tabs 20 welded to the bottom of the electrode posts 10.

[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 body 4 and the protective body 5 can be integrally injection molded using materials with insulating properties such as rubber and plastic; the space between them can be made easy to bend by thinning, opening holes, and other methods. The specific arrangement sequence and assembly method of the battery cover plastic parts on the battery cover 1, and the fastening and fixing of the protective body 5 on the main body 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 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 various solutions that can be formed by the combinations and variations of the above specific forms, as well as the specific implementation schemes of this embodiment, are all within the protection scope of this utility model.

[0038] To improve the secure fastening of the protective sheet 5 onto the main sheet 4, such as Figure 2 and Figure 4As shown, in some preferred exemplary embodiments, the electrode through hole 40 is provided with a connecting part on the side near the middle of the main plate 4, and the protective plate 5 is provided with a connecting mating part corresponding to the connecting part; the connecting mating part and the connecting part are connected together by means of snap-fit, heat fusion or the like, so as to keep the protective plate 5 in a state of being engaged with the main plate 4; in this case, the electrode tab 20 is inserted from one side of the protective plate 5 in the width direction between the protective plate 5 and the main plate 4, so as to be welded to the electrode 10.

[0039] With the connecting part located on the side of the pole through hole 40 near the middle of the main plate 4, the connecting part and the spacing space corresponding to each protective plate 5 will be located on both sides of the pole through hole 40, thus reserving a channel for the electrode tab 20 to pass through on one side of the protective plate 5 in the width direction. The electrode tab 20 can pass through this channel to the protective plate 5 and the main plate 4 to achieve welding with the pole 10. The fixed connection between the connecting part and the connecting mating part can make the protective plate 5 securely fastened to the main plate 4, ensuring the reliability of the fastening connection of the protective plate 5 on the main plate 4.

[0040] Regarding the specific design of the connecting and mating parts, there are naturally many different structural options to choose from; for example, the following can be used: Figure 2 and Figure 4 As shown, the connecting part includes a hot-melt post 420 integrally formed on the main sheet 4, and the connecting mating part includes a hot-melt hole 51 provided on the protective sheet 5. The hot-melt post 420 is inserted into and hot-melted fixed in the hot-melt hole 51. The hot-melt fixed connection between the main sheet 4 and the protective sheet 5 can effectively improve the reliability of the fastening connection of the protective sheet 5 on the main sheet 4.

[0041] Alternatively, one could use, such as Figures 5 to 9 As shown, the connecting part includes a snap-fit ​​post 422 integrally formed on the main body 4, and the connecting mating part includes a snap-fit ​​hole 52 provided on the protective body 5. The snap-fit ​​post 422 is inserted into and snapped into the snap-fit ​​hole 52. The snap-fit ​​method has the technical advantage of convenient assembly operation.

[0042] Alternatively, a boss can be provided on the protective sheet 5. With the connection of the mating part and the connecting part, the boss abuts against the main sheet 4, defining a space between the main sheet 4 and the protective sheet 5 to accommodate the inserted tab 20. By providing a boss on the protective sheet 5, when the protective sheet 5 is fastened to the main sheet 4, the boss creates a supporting effect between the main sheet 4 and the protective sheet 5, thereby defining a space between the main sheet 4 and the protective sheet 5, providing good accommodation conditions for the insertion of the tab 20.

[0043] The arrangement and location of the aforementioned bosses can be flexibly selected. When a heat-fusion hole 51 or a snap-fit ​​hole 52 needs to be provided on the protective sheet 5, a first boss 510 can be provided at the heat-fusion hole 51, and the heat-fusion hole 51 can be opened on the first boss 510; or, for the case where a snap-fit ​​hole 52 is provided, a second boss 520 can be provided at the snap-fit ​​hole 52, and the snap-fit ​​hole 52 can be opened on the second boss 520. The height dimension H of this interval space can of course be reasonably set, which is determined by the height of the boss. Preferably, the height dimension H can be set between 1mm and 5mm.

[0044] Continue as Figure 2 As shown, in some preferred exemplary embodiments, in the width direction of the main sheet 4, the side edge of the protective sheet 5 in this embodiment is located inside the side edge of the main sheet 4, and the distance between the side edge of the protective sheet 5 and the side edge of the main sheet 4 is between 0.5mm and 3.0mm. By reasonably setting the width dimension W1 of the main sheet 4 and the width dimension W2 of the protective sheet 5, and simultaneously centering the protective sheet 5 relative to the main sheet 4, space can be reserved on the side of the protective sheet 5 for the bending portion of the tab 20 to pass through; in specific settings, the width dimension W2 can be made 1.0mm-6.0mm smaller than the width dimension W1, so that the spacing space on the side of the protective sheet 5 is kept between 0.5mm and 3.0mm, forming a suitable space to avoid the bending portion of the tab 20 from passing through, preventing the tab 20 from contacting the battery casing or battery cover 1 and causing a short circuit.

[0045] Based on the above settings, the bending part 3 can be set as a sheet, such as... Figure 3 As shown, in the width direction of the main sheet 4, the width dimension W3 of the bending portion 3 is 0.25-0.5 times the width dimension W2 of the protective sheet 5. By designing the bending portion 3 as a thin sheet and setting its width dimension W3 to 0.25-0.5 times the width dimension W2, the bending portion 3 is easier to bend, thereby improving the convenience and yield of the battery cover plastic parts assembly. Furthermore, an elongated hole 30 arranged along the width direction of the main sheet 4 can be provided in the middle of the bending portion 3. By providing an elongated hole 30 on the bending portion 3, the bending part of the bending portion 3 can occur at the location of the elongated hole 30, which can further reduce the difficulty of bending the bending portion 3 and facilitate the fastening operation of the protective sheet 5 on the main sheet 4.

[0046] For the specific dimensions of the elongated hole 30, preferably, it remains as follows: Figure 3As shown, after the elongated hole 30 is made, the width L1 of the connecting plates at both ends of the elongated hole 30 left on the bent part 3 can be set to 2.5mm-8mm; the width L2 of the elongated hole 30 can be set to 0.8mm-3.0mm. Using these dimensions, the bent part 3 can be easily bent, and the bent part 3 still has sufficient connection strength after bending. To ensure a smooth overall transition after bending, a deformation notch 31 can be provided at the root of the connecting main piece 4 of the bent part 3, so that the bent part 3 has sufficient bending length. The final shape of the bent part 3 is as follows: Figure 15 As shown, in conjunction with the limiting effect of the aforementioned boss, the overall curved bending portion 3 and the boss can jointly limit the height of the gap space between the main sheet 4 and the protective sheet 5.

[0047] In addition, it can also be like Figures 5 to 9 As shown, the bending part 3 adopts the following design. The bending part 3 includes a connecting platform 32 protruding from the end of the main sheet 4 toward the side away from the battery cover plate 1, and a connecting plate 33 connecting the top of the connecting platform 32 and the protective sheet 5. The connecting plate 33 is provided with a thinning groove 34 that runs through the width direction of the main sheet 4. By designing the bending part 3 into two parts, the connecting platform 32 and the connecting plate 33, and providing a thinning groove 34 on the connecting plate 33, the difficulty of bending the bending part 3 can be reduced, thereby smoothly completing the fastening operation of the protective sheet 5 on the main sheet 4. Furthermore, the setting of the connecting platform 32 serves the function of the aforementioned protrusion, which can limit the gap space between the main sheet 4 and the protective sheet 5, thereby well accommodating the inserted tab 20.

[0048] The specific dimensions of the connecting plate 33 and its surrounding structure can be set as follows. For example... Figure 8As shown, the bending portion 3 is located at the bottom of the thinning groove 34, and the thickness T of the bottom of the thinning groove 34 is between 0.15mm and 0.4mm. The width D of the bending portion is set to 0.05mm-0.8mm; this ensures the accuracy and convenience of bending, while also guaranteeing the connection strength after bending. The thickness T1 of the 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 battery cover plastic parts during and after bending. To facilitate the processing and forming of the thinning groove 34, its cross-section can be designed as a trapezoid. The width D1 of the first transition area located on both sides of the bending portion 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, ensuring a smooth overall transition after the connecting plate 33 is bent, guaranteeing the stability of the product, and preventing defects such as shrinkage that could reduce the reliability of the product. The thickness T2 of the connecting plate 33 located between the thinning groove 34 and the protective plate 5 can be set to 0.5mm-1.8mm, or it can be the same thickness as the protective plate 5, to ensure the strength of the extended part, so that the electrode tab 20 can be firmly fixed in the welding design position between the main plate 4 and the protective plate 5.

[0049] It should be noted that by setting the connecting platform 32, the aforementioned boss is also used, which limits the height of the gap between the main sheet 4 and the protective sheet 5 after bending the bending part 3. By limiting the thickness T of the plate at the bottom of the thinning groove 34 to between 0.15mm and 0.4mm, it is easier to fold the bending part 3 from this position. After folding, the connecting plates 33 on both sides of the folded part 3 can fit together well. With the help of the connecting platform 32, it is easier and more accurate to limit the height H of the gap between the protective sheet 5 and the main sheet 4 after fastening.

[0050] Continue as Figure 10 , Figure 11 As shown, when the plastic part of the battery cover is placed on the battery cover 1 and welded to the tabs 20 from the electrode assembly 2, the tabs 20 can be attached from both sides of the main body 4 to the bottom of the corresponding electrode post 10 before welding. After welding, the bent part 3 is bent to fasten the protective sheet 5 onto the main body 4, forming an isolation and protection for the welded part. Then, the tabs 20 are bent to straighten the electrode assembly 2 and the battery cover 1 as shown. Figure 12 As shown in the diagram, it can be inserted into the battery casing.

[0051] In practical applications, the battery cover 1 typically has two terminals 10 spaced apart. An insulating sleeve 11 is fitted over the terminals 10, forming an insulating barrier between the terminals 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 body 4 of this embodiment has an explosion-proof valve clearance groove 43, and multiple through holes 430 are provided on the bottom or side wall of the explosion-proof valve clearance groove 43 to release high-pressure gas inside the battery casing when a short circuit or other abnormality occurs in the electrode group 2. Simultaneously, protrusions 41 can be provided around the perimeter of the terminal through holes 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 body 4 when it is attached to the battery cover 1.

[0052] In summary, the battery cover plastic component of this embodiment is mainly composed of two parts: a main body 4 that can be bent and folded together and a protective sheet 5. When using the battery cover plastic component, the main body 4 can be first attached to the inner side of the battery cover 1, and then the tabs 20 led out from the electrode group 2 can be welded to the corresponding terminals 10. Then, the gap space is bent to fasten the protective sheet 5 to the main body 4. In this way, the main body 4 can form a reliable insulating barrier between the battery cover 1 and the tabs 20, and the protective sheet 5 covers the welding part between the terminals 10 and the tabs 20, and isolates the electrode group 2 from the tabs 20 welded to the bottom of the terminals 10. This ensures the isolation and protection effect between the welding part and the electrode group 2, and prevents welding slag from falling into the electrode group 2 or welding protrusions from piercing the electrode group 2, thereby forming a good isolation and protection between the battery electrode group 2 and the terminals 10.

[0053] A second aspect of this utility model provides a battery, which includes the battery cover plastic component provided in the first embodiment; one exemplary structure is as follows: Figure 10 , Figure 11 and Figure 12 As shown.

[0054] In Adoption Figures 1 to 4 When the battery cover plastic part is shown, after the welding of the tab 20 and the fastening and fixing of the protective sheet 5 to the main sheet 4 are completed, the overall cross-sectional structure of the battery is as follows. Figures 13 to 15 As shown, the bending portion 3 is bent in an arc shape. Due to the presence of the first protrusion 510, the space between the main body 4 and the protective body 5 for accommodating the tab 20 is well defined, and the height dimension H of the space is consistent with the height of the first protrusion 510.

[0055] After the protective sheet 5 is fastened, the hot melt column 420 is inserted into the hot melt hole 51. The hot melt hole 51 includes a through section 511 and a hot melt section 512 connected in sequence. The radial dimension of the hot melt section 512 is larger than that of the through section 511. The head 421 of the hot melt column 420, once inserted, will protrude outside the hot melt hole 51. The head 421 is melted by heating and then pressed into the hot melt section 512. Due to the deformation caused by heat and pressure, the radial dimension of the head 421 increases, completely filling the entire hot melt section 512. This effectively prevents the hot melt column 420 from coming out of the hot melt hole 51, making the hot melt connection firm and reliable.

[0056] In Adoption Figures 5 to 9 When the battery cover plastic part is shown, after the welding of the tab 20 and the fastening and fixing of the protective sheet 5 to the main sheet 4 are completed, the overall cross-sectional structure of the battery is as follows. Figure 16 As shown, due to the thinning groove 34, the bending part 3 is folded at the bending part located 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 second protrusion 520, the space between the main plate 4 and the protective plate 5 for accommodating the tab 20 is well defined, and the height dimension H of the space is consistent with the height of the connecting platform 32 and the second protrusion 520.

[0057] After the protective plate 5 is fastened, the snap-fit ​​post 422 is inserted into the snap-fit ​​hole 52. The snap-fit ​​hole 52 includes an insertion section 521 and a locking section 522 connected in sequence. The radial dimension of the locking section 522 is larger than the radial dimension of the insertion section 521. The snap-fit ​​head 423 of the snap-fit ​​post 422, once inserted into place, will lock into the locking section 522, thereby effectively preventing the snap-fit ​​post 422 from coming out of the snap-fit ​​hole 52, making the snap-fit ​​connection firm and reliable.

[0058] This design incorporates a novel plastic battery cover with an added protective sheet 5. The protective sheet 5 is securely fastened to the main sheet 4, serving to fix and shape the tab 20. The well-designed bending section 3 ensures effective bending. This design effectively confines the bent tab 20 between the protective sheet 5 and the main sheet 4, guaranteeing the consistency of the bent tab 20 and preventing the risk of the tab 20 and the terminal post 10 being inserted backwards into the electrode assembly 2, thus improving product safety.

[0059] 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 plastic battery cover for isolating and protecting the battery cover and the electrode assembly, characterized in that: The battery cover plastic part is constructed as a sheet, including a main sheet body that can be attached to the inner side of the battery cover, and protective sheets body that are disposed at both ends of the main sheet body in the length direction. The main sheet body is provided with electrode post through holes for the electrode posts on the battery cover to pass through. The main plate and the protective plate are connected by a bendable bend. As the bend bends, the protective plate can be fastened to the main plate to isolate the electrode assembly from the tab welded to the bottom of the electrode post.

2. The battery cover plastic part according to claim 1, characterized in that: A connecting part is provided on the side of the pole through hole near the middle of the main plate body, and a connecting mating part is provided on the protective plate body corresponding to the connecting part; The connecting mating part is connected to the connecting part to keep the protective sheet body in a state of being engaged with the main sheet body; the electrode tab is inserted from one side of the protective sheet body in the width direction between the protective sheet body and the main sheet body to be welded to the electrode post.

3. The battery cover plastic part according to claim 2, characterized in that: The protective sheet has a boss. As the connecting part is fixed to the connecting part, the boss abuts against the main sheet and defines a space between the main sheet and the protective sheet for accommodating the inserted tab.

4. The battery cover plastic part according to claim 2, characterized in that: The connecting part includes a hot-melt column integrally formed on the main body, and the connecting mating part includes a hot-melt hole provided on the protective sheet, wherein the hot-melt column is inserted and hot-melted fixed in the hot-melt hole.

5. The battery cover plastic part according to claim 1, characterized in that: In the width direction of the main sheet, the side edge of the protective sheet is located inside the side edge of the main sheet, and the distance between the side edge of the protective sheet and the side edge of the main sheet is between 0.5mm and 3.0mm.

6. The battery cover plastic part according to any one of claims 1 to 5, characterized in that: The bending portion is configured as a sheet, and in the width direction of the main sheet, the width dimension W3 of the bending portion is 0.25-0.5 times the width dimension W2 of the protective sheet.

7. The battery cover plastic part according to claim 6, characterized in that: The bending section has an elongated hole arranged along the width direction of the main body in the middle.

8. The battery cover plastic part according to any one of claims 1 to 5, characterized in that: The bending portion includes a connecting platform that protrudes from the end of the main sheet towards the side away from the battery cover, and a connecting plate connecting the top of the connecting platform and the protective sheet, wherein the connecting plate is provided with a thinning groove that extends through the width direction of the main sheet.

9. The battery cover plastic part according to claim 8, characterized in that: The bent portion of the bending section is located at the bottom of the thinning groove, and the thickness T at the bottom of the thinning groove is between 0.15mm and 0.4mm.

10. A battery, characterized in that: The battery includes a battery cover plastic component as described in any one of claims 1 to 9.

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