Battery protection isolation structure and power battery

Abstract

The utility model relates to new energy battery technical field and provide a kind of battery protection isolation structure and power battery.The utility model discloses battery protection isolation structure includes the isolation body and protective sheet body integrally connected;Isolation body is attached to the inner side of battery cover plate, and the both ends of the length direction of isolation body are respectively equipped with the pole post via hole for the pole post on battery cover plate to pass through. Among them, the protective sheet body is two and is connected to the both ends of isolation body by connecting sheet body respectively, corresponding two pole post via holes are set. Connecting sheet body can be bent, so that protective sheet body can be buckled on isolation body, and the pole group is separated from the pole lug welded at the bottom of pole post.The utility model discloses battery protection isolation structure, protective sheet body forms covering between the welding position of pole post and pole lug, and the pole group is separated from the pole lug welded at the bottom of pole post, can form good isolation protection to the position of the bottom of pole post for welding pole lug.

Description

Technical Field

[0001] This utility model relates to the field of new energy battery technology, and in particular to a battery protection and isolation structure and a power 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 protection and isolation structure so as to form good isolation and protection for the part at the bottom of the terminal post used for welding the tab.

[0006] To achieve the above objectives, the technical solution of this utility model is implemented as follows: A battery protection and isolation structure is disposed between the electrode assembly and the battery cover plate inside a power battery. The battery protection and isolation structure includes an integrally connected isolation body and a protective sheet. The isolation body is attached to the inner side of the battery cover plate, and each end of the isolation body along its length is provided with an electrode post through hole for the electrode post on the battery cover plate to pass through. There are two protective sheets corresponding to the two electrode post through holes, and they are respectively connected to the two ends of the isolation body by connecting sheets. The connecting sheets can be bent so that the protective sheets can be fastened to the isolation body, thereby isolating the electrode assembly from the electrode tabs welded to the bottom of the electrode post.

[0007] Furthermore, in the width direction of the insulator, the side edge of the protective sheet is located inside the side edge of the insulator, and the distance between the side edge of the protective sheet and the side edge of the insulator is between 0.5mm and 3.0mm.

[0008] Furthermore, in the width direction of the isolator, the width of the connecting piece is 0.25-0.5 times the width of the protective piece.

[0009] Furthermore, the middle part of the connecting piece is provided with an elongated hole arranged along the width direction of the separator, and the width L1 of the connecting piece at both ends of the elongated hole is between 2.5mm and 8mm.

[0010] Furthermore, the connecting piece includes a connecting platform protruding from the end of the isolator toward the side that engages with the protective piece, and a connecting plate connecting the top of the connecting platform and the protective piece, wherein the connecting plate is provided with a thinning groove extending through the width direction of the isolator.

[0011] Furthermore, corresponding to the explosion-proof valve mounting hole on the battery cover, an explosion-proof valve clearance groove is provided in the middle of the isolation body, and a through hole is provided on the wall plate of the explosion-proof valve clearance groove.

[0012] Furthermore, a connecting portion is provided on the side of the electrode through hole near the middle of the isolator, and a connecting mating portion corresponding to the connecting portion is provided on the protective sheet; when the protective sheet is fastened to the isolator, the connecting mating portion is fixed to the connecting portion, and the electrode tab is inserted from one side of the protective sheet in the width direction between the protective sheet and the isolator to be welded to the electrode.

[0013] Furthermore, the connecting part includes a hot-melt column integrally formed on the isolator, 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.

[0014] Furthermore, a first boss is provided on the side of the protective sheet facing the insulator at the hot-melt hole. The hot-melt hole is opened on the first boss. As the hot-melt post is inserted and fixed in the hot-melt hole, the first boss abuts against the insulator, and a gap space is defined between the insulator and the protective sheet to accommodate the insertion of the tab.

[0015] Compared with the prior art, this utility model has the following advantages: (1) The battery protection and isolation structure of this utility model is provided between the battery cover and the electrode assembly. It mainly consists of an isolator and a protective sheet. When welding and encapsulating the battery protection and isolation structure, the isolator can be attached to the inner side of the battery cover first. Then, the tabs led out from the electrode assembly are welded to the corresponding poles. The connecting sheet is then bent to fasten the protective sheet to the isolator. In this way, the isolator can form a reliable insulation between the battery cover and the tabs. The protective sheet covers the welding part between the poles and the tabs and isolates the electrode assembly from the tabs welded to the bottom of the poles. This ensures the isolation and protection effect between the welding part and the electrode assembly and prevents welding slag from falling into the electrode assembly or welding protrusions from piercing the electrode assembly. This provides good isolation and protection for the part at the bottom of the pole used for welding the tabs.

[0016] (2) By reasonably setting the width dimension W1 of the isolator and the width dimension W2 of the protective sheet, and setting the protective sheet in the center relative to the isolator, space can be reserved on the side of the protective sheet for the bending part of the electrode to pass through, so as to prevent the electrode from contacting the battery shell or battery cover and causing a short circuit.

[0017] (3) The connecting piece is designed as a thin sheet and its width is set to 0.25-0.5. The connecting piece is easier to bend, thereby improving the convenience and yield of battery protection and isolation structure assembly.

[0018] (4) By setting an elongated hole on the connecting piece, the bending part of the connecting piece can occur at the location of the elongated hole, which can further reduce the difficulty of bending the connecting piece and facilitate the fastening operation of the protective piece on the isolator; and by reasonably setting the width of the connecting piece at both ends of the elongated hole, the bending operation of the connecting piece can be made easier while ensuring that the connecting piece still has sufficient connection strength.

[0019] (5) The connecting plate 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 connecting plate, so as to successfully complete the fastening operation of the protective plate on the isolator. In addition, the setting of the connecting platform plays the role of the above-mentioned protrusion, which can limit the gap space between the isolator and the protective plate, so as to well accommodate the inserted tab.

[0020] (6) The explosion-proof valve clearance groove provides a reasonable bottom space for the installation of the explosion-proof valve on the battery cover; when an abnormality such as a short circuit occurs in the electrode group, the high-pressure gas inside the battery casing can be discharged through the through hole and the explosion-proof valve on the battery cover.

[0021] (7) If the connecting part is set on the side of the pole through hole near the middle of the isolator, 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 isolator 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 isolator, ensuring the reliability of the fastening connection of the protective plate on the isolator.

[0022] (8) The isolation body and the protective sheet are connected by heat fusion, which can effectively improve the reliability of the fastening connection of the protective sheet on the isolation body.

[0023] (9) A protrusion is provided on the protective sheet. When the protective sheet is fastened to the isolator, the protrusion forms a supporting effect between the isolator and the protective sheet, thereby defining a gap space between the isolator and the protective sheet, providing good accommodation conditions for the insertion of the tab.

[0024] This utility model also proposes a power battery, which adopts the battery protection and isolation structure described in this utility model. The power battery of this utility model has the technical advantages of the aforementioned battery protection and isolation structure. 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 battery protection and isolation structure facing the battery cover plate according to an embodiment of the present utility model; Figure 2 for Figure 1 The diagram shows the structure of the battery protection and isolation structure on the side opposite to 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 battery protection and isolation structure after the protective sheet is fastened to the isolation body. Figure 5 This is a schematic diagram of the battery protection and isolation structure configured with another connecting piece according to an embodiment of the present invention, facing the battery cover plate. Figure 6 for Figure 5 The diagram shows the structure of the battery protection and isolation structure on the side opposite to 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 battery protection and isolation structure after the protective sheet is fastened to the isolation body. 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 connector body 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 ear; 3. Connecting plate; 30. Elongated hole; 31. Deformation notch; 32. Connecting platform; 33. Connecting plate; 34. Thinning groove; 4. Isolator; 40. Pole post through hole; 41. Protrusion; 420. Hot melt column; 421. Head; 422. Snap-fit ​​column; 423. Clip; 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 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 protection and isolation structure disposed between the electrode group 2 and the battery cover plate 1 inside the power battery; the battery protection and isolation structure of this embodiment utilizes its innovative structural design to form good isolation and protection for the part at the bottom of the electrode post 10 used for welding the electrode tab 20.

[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 battery protection and isolation structure, one exemplary structure of which is as follows: Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown.

[0036] Overall, the battery protection and isolation structure includes an integrally connected separator 4 and protective sheet 5. The separator 4 is attached to the inside of the battery cover plate 1, and each end of the separator 4 along its length is provided with a terminal post through hole 40 for the terminal post 10 on the battery cover plate 1 to pass through. There are two protective sheets 5 corresponding to the two terminal post through holes 40, and they are respectively connected to the two ends of the separator 4 by connecting sheets 3. The connecting sheets 3 can be bent so that the protective sheets 5 can be fastened to the separator 4, thereby isolating the electrode group 2 from the electrode tab 20 welded to the bottom of the terminal post 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 aforementioned isolator 4 and protective sheet 5 can be integrally injection molded using materials with insulating properties such as rubber and plastic; the connecting sheet 3 can be made easy to bend by thinning, opening holes, and other methods. The specific arrangement sequence and assembly method of the battery protective isolation structure on the battery cover 1, and the fastening and fixing of the protective sheet 5 on the isolator 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 mentioned 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 firmness of the protective sheet 5 fastening to the isolator 4, such as Figure 2 and Figure 4 As shown, in some preferred exemplary embodiments, the pole through hole 40 is provided with a connecting part on the side near the middle of the isolator 4, and the protective sheet 5 is provided with a connecting mating part corresponding to the connecting part; when the protective sheet 5 is fastened to the isolator 4, the connecting mating part is fixed to the connecting part, and the pole lug 20 passes through the protective sheet 5 from one side in the width direction between the protective sheet 5 and the isolator 4 to be welded to the pole 10.

[0039] With the connecting part located on the side of the pole through hole 40 near the middle of the isolator 4, the connecting part and the spacing space corresponding to each protective sheet 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 sheet 5 in the width direction. The electrode tab 20 can pass through this channel between the protective sheet 5 and the isolator 4 to achieve welding with the pole 10. The fixed connection between the connecting part and the connecting mating part can make the protective sheet 5 securely fastened to the isolator 4, ensuring the reliability of the fastening connection of the protective sheet 5 on the isolator 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 4As shown, the connecting part includes a hot-melt column 420 integrally formed on the isolator 4, and the connecting mating part includes a hot-melt hole 51 provided on the protective sheet 5. The hot-melt column 420 is inserted into and hot-melted fixed in the hot-melt hole 51. The hot-melt fixed connection between the isolator 4 and the protective sheet 5 can effectively improve the reliability of the fastening connection of the protective sheet 5 on the isolator 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 isolator 4, and the connecting mating part includes a snap-fit ​​hole 52 provided on the protective sheet 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. As the connecting part and the connecting part are fixed together, the boss abuts against the isolator 4 and defines a gap space between the isolator 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 isolator 4, the boss forms a supporting effect between the isolator 4 and the protective sheet 5, thereby defining a gap space between the isolator 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 2As shown, in some preferred exemplary embodiments, in the width direction of the isolator 4, the side edge of the protective sheet 5 in this embodiment is located inside the side edge of the isolator 4, and the distance between the side edge of the protective sheet 5 and the side edge of the isolator 4 is between 0.5mm and 3.0mm. By reasonably setting the width dimension W1 of the isolator 4 and the width dimension W2 of the protective sheet 5, and simultaneously centering the protective sheet 5 relative to the isolator 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 1.0mm-6.0mm smaller than the width dimension W1, so that the spacing space on the side of the protective sheet 5 is maintained 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 connecting piece 3 can be configured as a sheet, such as... Figure 3 As shown, in the width direction of the separator 4, the width dimension W3 of the connecting piece 3 is 0.25-0.5 times the width dimension W2 of the protective piece 5. Designing the connecting piece 3 as a thin sheet and setting its width dimension W3 to 0.25-0.5 times the width dimension W2 makes the connecting piece 3 easier to bend, thereby improving the convenience and yield of assembling the battery protection and isolation structure. Furthermore, an elongated hole 30 arranged along the width direction of the separator 4 can be provided in the middle of the connecting piece 3. By providing the elongated hole 30 on the connecting piece 3, the bending of the connecting piece 3 can occur at the location of the elongated hole 30, further reducing the difficulty of bending the connecting piece 3 and facilitating the fastening operation of the protective piece 5 on the separator 4.

[0046] For the specific dimensions of the elongated hole 30, preferably, it remains as follows: Figure 3 As shown, after the elongated hole 30 is made, the width L1 of the connecting piece 3 located at both ends of the elongated hole 30 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 connecting piece 3 can be easily bent, and the bent connecting piece 3 still has sufficient connection strength. To ensure a smooth transition after bending, a deformation notch 31 can be provided at the root of the connecting piece 3 connected to the isolator 4, so that the connecting piece 3 has sufficient bending length. The final shape of the bent connecting piece 3 is as follows: Figure 15 As shown, in conjunction with the limiting effect of the aforementioned boss, the overall curved connecting piece 3 and the boss can jointly define the height of the gap space between the isolator 4 and the protective piece 5.

[0047] In addition, it can also be like Figures 5 to 9As shown, the connecting piece 3 adopts the following design. The connecting piece 3 includes a connecting platform 32 protruding from the end of the isolator 4 toward the side where it is fastened to the protective piece 5, and a connecting plate 33 connecting the top of the connecting platform 32 and the protective piece 5. The connecting plate 33 is provided with a thinning groove 34 that runs through the width of the isolator 4. By designing the connecting piece 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 connecting piece 3 can be reduced, thus smoothly completing the fastening operation of the protective piece 5 on the isolator 4. Furthermore, the connecting platform 32 serves the function of the aforementioned protrusion, which can limit the gap space between the isolator 4 and the protective piece 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 8 As shown, the bent portion of the connecting plate 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 bent 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 tabs 20 from collapsing due to deformation of the battery protection and isolation structure 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 bent 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 isolator 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 isolator 4 and the protective plate 5 after bending the connecting piece 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 connecting piece 3 from this position. After folding, the connecting plates 33 on both sides of the folded part of the connecting piece 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 plate 5 and the isolator 4 after fastening.

[0050] Continue as Figure 10 , Figure 11 As shown, when the battery protective isolation structure is placed on the battery cover plate 1 and welded to the tabs 20 from the electrode assembly 2, the tabs 20 can be attached from both sides of the separator 4 to the bottom of the corresponding electrode post 10 before welding. After welding, the connecting piece 3 is bent, and the protective piece 5 is fastened to the separator 4 to form an isolation and protection for the welded part. Then, the tabs 20 are bent to align the electrode assembly 2 and the battery cover plate 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 separator 4 in this embodiment is provided with an explosion-proof valve clearance groove 43. 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. Additionally, 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 separator 4 when it is attached to the battery cover 1.

[0052] In summary, the battery protection and isolation structure of this embodiment, by setting a battery protection and isolation structure mainly composed of an isolator 4 and a protective sheet 5 between the battery cover plate 1 and the electrode group 2, allows for the following steps during the welding and encapsulation of the battery protection and isolation structure: first, the isolator 4 is attached to the inner side of the battery cover plate 1; then, the tabs 20 led out from the electrode group 2 are welded to the corresponding terminals 10; and then the connecting sheet 3 is bent to fasten the protective sheet 5 onto the isolator 4. In this way, the isolator 4 can form a reliable insulating isolation between the battery cover plate 1 and the tabs 20, while the protective sheet 5 covers the welding area 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 area and the electrode group 2, preventing welding slag from falling into the electrode group 2 or welding protrusions from piercing the electrode group 2, thereby providing good isolation and protection for the area at the bottom of the terminals 10 used for welding the tabs 20.

[0053] A second aspect of this utility model provides a power battery, which includes the battery protection and isolation structure 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 protection and isolation structure shown is completed, after the welding of the tabs 20 and the fastening and fixing of the protective sheet 5 to the separator 4 are finished, the overall cross-sectional structure of the battery is as follows: Figures 13 to 15 As shown, the connecting plate 3 is curved in an arc shape. Due to the presence of the first protrusion 510, the space between the isolator 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 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 protection and isolation structure shown is completed, after the welding of the tabs 20 and the fastening and fixing of the protective sheet 5 to the separator 4 are finished, the overall cross-sectional structure of the battery is as follows: Figure 16 As shown, due to the thinning groove 34, the connecting plate 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 second protrusion 520, the space between the isolator 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 solution incorporates a novel battery protection and isolation structure, adding a protective sheet 5. The protective sheet 5 is securely fastened to the separator 4, serving to fix and shape the tab 20. The rational design of the connecting sheet 3 ensures its bending effect. In this way, the bent tab 20 can be well confined between the protective sheet 5 and the separator 4, ensuring 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 group 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 battery protection and isolation structure, disposed between the electrode assembly (2) and the battery cover plate (1) inside a power battery, characterized in that: The battery protection and isolation structure includes an integrally connected isolation body (4) and a protective sheet (5). The isolator (4) is attached to the inner side of the battery cover (1), and the two ends of the isolator (4) in the length direction are respectively provided with electrode through holes (40) for the electrode (10) on the battery cover (1) to pass through; the protective sheet (5) consists of two corresponding to the two electrode through holes (40), and is respectively connected to the two ends of the isolator (4) through the connecting sheet (3); The connecting piece (3) can be bent so that the protective piece (5) can be fastened to the isolator (4) to separate the electrode assembly (2) from the tab (20) welded to the bottom of the electrode post (10).

2. The battery protection and isolation structure according to claim 1, characterized in that: In the width direction of the isolation body (4), the side edge of the protective sheet (5) is located inside the side edge of the isolation body (4), and the distance between the side edge of the protective sheet (5) and the side edge of the isolation body (4) is between 0.5mm and 3.0mm.

3. The battery protection and isolation structure according to claim 2, characterized in that: In the width direction of the isolation body (4), the width dimension W3 of the connecting piece (3) is 0.25-0.5 times the width dimension W2 of the protective piece (5).

4. The battery protection and isolation structure according to claim 3, characterized in that: The middle part of the connecting piece (3) is provided with an elongated hole (30) arranged along the width direction of the isolation body (4), and the width L1 of the connecting piece (3) at both ends of the elongated hole (30) is between 2.5mm and 8mm.

5. The battery protection and isolation structure according to claim 3, characterized in that: The connecting plate (3) includes a connecting platform (32) protruding from the end of the isolator (4) toward the protective plate (5) and a connecting plate (33) connected between the top of the connecting platform (32) and the protective plate (5), and the connecting plate (33) is provided with a thinning groove (34) that runs through the width direction of the isolator (4).

6. The battery protection and isolation structure according to claim 1, characterized in that: Corresponding to the explosion-proof valve mounting hole (12) on the battery cover (1), an explosion-proof valve clearance groove (43) is provided in the middle of the isolation body (4), and a through hole (430) is provided on the wall plate of the explosion-proof valve clearance groove (43).

7. The battery protection and isolation structure according to any one of claims 1 to 6, characterized in that: A connecting part is provided on the side of the pole through hole (40) near the middle of the isolator (4), and a connecting mating part corresponding to the connecting part is provided on the protective plate (5); When the protective sheet (5) is fastened to the isolator (4), the connecting mating part is fixed to the connecting part, and the electrode tab (20) is inserted from one side of the protective sheet (5) in the width direction between the protective sheet (5) and the isolator (4) to be welded to the electrode post (10).

8. The battery protection and isolation structure according to claim 7, characterized in that: The connecting part includes a hot melt column (420) integrally formed on the isolator (4), and the connecting mating part includes a hot melt hole (51) provided on the protective sheet (5). The hot melt column (420) is inserted and hot melted and fixed in the hot melt hole (51).

9. The battery protection and isolation structure according to claim 8, characterized in that: On the side of the protective sheet (5) facing the insulator (4), there is a first boss (510) located at the hot melt hole (51). The hot melt hole (51) is opened on the first boss (510). As the hot melt column (420) is inserted and fixed in the hot melt hole (51), the first boss (510) abuts against the insulator (4). A gap space is defined between the insulator (4) and the protective sheet (5) to accommodate the insertion of the tab (20).

10. A power battery, characterized in that: The power battery adopts the battery protection and isolation structure as described in any one of claims 1 to 9.

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